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  • 1980-1984  (6,851)
  • 1981  (6,851)
  • Chemistry  (6,851)
  • Organic Chemistry  (714)
  • Nuclear reactions
  • 101
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 73-83 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Shrinking and Swelling Properties of Chemically Cured Resin Mortars for Chemical Resistant LiningsIn the field of acid-proof construction chemically cured mortars, especially those based on phenolic, furan, epoxy or unsaturated polyester resins are used to apply linings on floors or in vessels. Sometimes these resin mortars are used as a troweling compound for monolithic floors, more often however as a bedding and pointing material for ceramic tiles or special shaped bricks. Because of the good adherence to the supporting construction to be protected, variations in dimension of the mortar as an effect of shrinkage or swelling cause stresses, which can exceed the strength of these linings and then could cause damage to the integrity of the installation.Methods for measuring the effective, i.e. stress generating dimensional changes in resin mortars were investigated for a variety of conditions, and testing equipment for determining the stresses generating in these mortars are developed. The results are represented graphically. The evaluation is done with respect to the possible effects of the behavior of the mortars in installed brick linings and floor coverings.
    Notes: Im Säureschutzbau werden reaktionshärtende Kitte, vorwiegend auf Basis von Phenol-, Furan-, Epoxidharz (EP) sowie ungesättigten Polyesterharzen (UP) zum Herstellern von Belägen bzw. Behälter-Auskleidungen (Ausmauerungen) verwendet, und zwar teils für sich allein in Form von Spachtelungen, meist als Verlege- und Verfugematerial für keramische Platten und Formsteine. Wegen des Verbundes dieser Beläge mit dem zu schützenden, tragenden Untergrund erzeugen Längenänderungen der Kitte in Form von Schwinden oder Quellen Eigenspannungen, welche die Festigkeit der Beläge bzw. Ausmauerungen überschreiten können und dann Schäden hervorrufen.Es wurden Meßverfahren zum Erfassen der effektiv wirksamen, d. h. spannungserzeugenden Längenänderungen unter verschiedenartigen Umgebungsbedingungen an Kunstharzkitten ausgeprüft sowie Vorrichtungen zum Messen der in Kitten entstehenden Eigenspannungen entwickelt. Die Meßergebnisse sind graphisch dargestellt. Ihre Auswertung erfolgt im Hinblick auf die mögliche Auswirkung der Verhaltensweisen der Kitte in Belägen bzw. Ausmauerungen.
    Additional Material: 11 Ill.
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  • 102
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 106-106 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 1 Ill.
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  • 103
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 107-107 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 1 Ill.
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  • 104
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981) 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 105
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 126-134 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Hochfeste Schrauben und Muttern snd zwar relativ preiswerte Massenprodukte, doch sind sie gleichzeitig Maschinenelemente höchster Präzision großer statischer und dynamischer Haltbarkeiten werden sehr hohe Anforderungen an das örtliche Werkstoffverhalten in den vielfach scharf gekerbten Schraubenverbindungen gestellt. Nur eine systematische Forschung und Entwicklung, zu der Prof. Dr. Ing. H. Wiegand Während seiner Ingenieurtätigkeit wesentlich beigetragen und viele Arbeiten auf diesem Gebiet angeregt ht, konnte zum heutigen Stand der konstruktiven Gestaltung und werkstofftechnischen Auslegung führen. Trotzdem ist die Entwicklung von Schrauben und Muttern mit noch besserer Haltbarkeit nie stehengeblieben. Daher werden auch neuere Forschungen notwendig werden, wobei die erarbeiteten Grundlagen das Fundament bilden und auch der alte Forscherdrang Vorbild sein wird.
    Additional Material: 13 Ill.
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  • 106
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981) 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 107
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 151-155 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Formation of Fracture Surfaces and Adhesion Mechanisms of Titanium Steel Explosive BondingsInvestigations on adhesion of the model system steel-titanium explosive platings have been carried out under the condition of an uniaxial tensile test. A bond model of explosive plating will be proposed and discusses by means of SEM-analysis of the fracture surfaces. Hence it follows, that in the range of the slow collision velocity, the bond mechanism is identical with that obtained by friction welding processes. At medium collision velocity a formation of thin hydrodynamic metal films with lubricating effects and slight adhesion in the interface region takes place. Extreme large collision velocity rate cause the bond due to fusion welding processes.
    Notes: Am Modellsystem Stahl-Reintitan-Explosionsplattierungen wurden Untersuchungen zur Haftung im einachsigen Normalspannungsversuch durchgeführt. Ein Bindungsmodell zur Explosionsplattierung wird aufgrund rasterelektronenoptischer Bruchflächenanalysen vorgeschlagen und diskutiert. Danach entspricht der Bindungsmechanismus bei geringen Kollisionsgeschwindigkeiten dem des Reibschweißens. Bei mittleren Geschwindigkeiten treten dünne hydrodynamische Metallfilme mit Schmiereffekten im Grenzbereich auf, die geringe Haftung bewirken. Extrem hohe Kollisionsgeschwindigkeiten verursachen die Bindung infolge von Schmelzschweißvorgängen.
    Additional Material: 9 Ill.
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  • 108
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A47 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 109
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981) 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 110
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A58 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 111
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    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 335-335 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 112
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 324-329 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: A Method of Continuous and Element Specific Measurement of Corrosive Abrasion in Metallic MaterialsA radionuclide method is described which allows fast recording of very low corrosion rates in liquid media. The method can be combined with electrochemical methods and automated easily. Some practical examples show the large variety of possible applications.
    Notes: Es wird ein radionuklidtechnisches Verfahren zur schnellen Erfassung sehr niedriger Korrosionsgeschwindigkeiten in flüssigen Medien beschrieben. Das Verfahren läßt sich mit elektrochemischen Methoden kombinieren und leicht automatisieren. Einige Anwendungsbeispiele zeigen den großen Bereich der Einsatzmöglichkeiten.
    Additional Material: 5 Ill.
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  • 113
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    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 336-336 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 114
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981) 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 115
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    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A79 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 116
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    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A95 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 117
    ISSN: 0935-6304
    Keywords: Sample preparation procedure ; Column chromatography cleanup ; 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) at ppt levels ; Azulene visual column monitor ; Azulene quality assurance ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The novel application of azulene as a visual monitor of column chromatography performance during fractionation of complex waste water extracts for measurement of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) at part-per-trillion concentrations is described. TCDD elutes directly behind azulene, the blue visual aid, in the 6% ethyl ether/hexane fraction during Florisil column chromatography.
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  • 118
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 188-190 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Helium ionization detector (HID) ; Vinyl chloride ; Sulfur gases ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 119
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 247-248 
    ISSN: 0935-6304
    Keywords: Gas Chromatography ; No simple relationship found between polarity of polysiloxane phases and N-TFA amino acid butyl esters ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In this work, we have investigated the influence of the polarities and structures of 13 polysiloxanes on the retention of some N-TFA N-butyl esters of amino acids. Gehrke [1] was the first to examine the possible relationship between polarity and retention data of amino acid derivatives for 9 stationary liquid phases. He concluded that the molecular structure of the stationary liquid phase is an important factor determining retention.
    Additional Material: 3 Ill.
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  • 120
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 270-275 
    ISSN: 0935-6304
    Keywords: Dry-packing in liquid chromatography ; Lateral tapping beneficial ; Vertical tapping detrimental ; Manual versus automatic packing ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This contribution comprises two parts, the one covering some variables in the dry-packing of columns for liquid chromatography, the other the use of an automatic dry-packer in liquid chromatography. A high-pressure stainless steel column was dry-packed using a 20-44 μm size, irrregularly shaped, silica gel support. It was found that, when support was added in discrete amounts, lateral tapping produced a column of higher efficiency (HETP = 0.69 mm) than was the case for vertical tapping (HETP = 1.37 mm). Simultaneous vertical and lateral tapping produced an intermediate result. Bulk filling of the column followed by tapping was inferior to adding support in discrete amounts. An apparatus constructed to perform the vertical and lateral tapping operations automatically confirmed the above conclusions. It was concluded that commercially available dry-packing apparatus do not offer the best action for packing an efficient column since they involve predominantly vertical tapping.
    Additional Material: 2 Ill.
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  • 121
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 300-302 
    ISSN: 0935-6304
    Keywords: Micro HPLC ; Temperature gradient separation ; Column temperature effect ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 122
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 302-304 
    ISSN: 0935-6304
    Keywords: Liquid chromatography ; Hemagglutinin glycoprotein of influenza virus investigated ; Peptide separation ; 14C labeling for identification ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The potential of reverse-phase high-performance liquid chromatography (RP-HPLC) for the separation of the tryptic glycopeptides of the hemagglutinin (HA) glycoprotein of influenza virus has been investigated. Excellent separation was accomplished with sample recovery of at least 90-95% by the utilization of an octadecasilyl silica stationary phase and a phosphoric acid/n-propanol solvent system. Eight glycosylated tryptic peptide classes were resolved from the HA glycoprotein of the A/USSR/90/77 virus strain.
    Additional Material: 2 Ill.
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  • 123
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 346-347 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; WCOT-glass capillary ; Organophosphorus insecticides ; Pesticides ; Metabolites ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This article considers the separation of 23 organophosphorus insecticides to which two metabolites have been added. The high resolution of the column permits detection of the Z and E isomers of three of these insecticides.
    Additional Material: 1 Ill.
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  • 124
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 337-342 
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography ; Quantitation model ; Short computer program in BASIC given ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the approach described in this paper, the layer of adsorbent is divided into n sublayers. The radiation density in each sublayer is given by the sum of the transmittance and the reflectance of the adjacent sublayers. Absorption of light by the layer or the substance will diminish this radiation density. Depending upon the factors of reflectance and transmittance some light will pass to the adjacent sublayers. Two polynomials are derived from this readily understood formulation to calculate the reflectance or the transmittance of a layer of finite thickness. The algorithms given describe the reflectance and transmittance encountered in practical measurements with large amounts of substance per spot, as well as with small amounts. There are no restrictions with respect to nonideal scattering or reflection by the adsorbent layer support.
    Additional Material: 8 Ill.
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  • 125
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 17-23 
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, TLC ; Liquid chromatography, LC ; Adsorption chromatography ; LC with mixed mobile phases ; Heterogeneity effects in adsorption chromatography ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In this paper the equation for thin-layer adsorption chromatography with multicomponent mobile phases, proposed by Ościk in 1965 is extended to energetically heterogeneous solid surfaces. Other forms of this equation, more convenient in practical applications, are presented. Model calculations are made for TLC with binary mobile phases according to the modified form of Ościk's equation. Finally, this equation is compared with that of Snyder.
    Additional Material: 5 Ill.
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  • 126
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981) 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 127
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 580-581 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Coal gasification tar ; Boiling point distribution ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 128
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 584-585 
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Reverse-phase mode ; TBAOAc/NH4OAc ion-pairing reagent circumvents problems ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 129
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    Journal of High Resolution Chromatography 4 (1981), S. 591-594 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 130
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981) 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 131
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 89-90 
    ISSN: 0935-6304
    Keywords: Liquid-solid chromatography, LSC ; Solute-solvent association in LSC ; LSC with mixed mobile phase ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
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  • 132
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    Journal of High Resolution Chromatography 4 (1981), S. 653-654 
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Diastereoisomer separation of organic sulfites ; Bis(2-aryl-3-oxotetrahydro-2H-1,2-oxazin-5-yl) sulfite ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 133
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    Journal of High Resolution Chromatography 4 (1981), S. 659-660 
    ISSN: 0935-6304
    Keywords: Thin layer chromatography, TLC ; Quantitation by TLC scanner ; Detection mode, reflection ; Measuring mode, absorbance ; RSD 3% for carbofuran and 1% for quinalphos ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 134
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    Journal of High Resolution Chromatography 4 (1981), S. 197-200 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 135
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    Journal of High Resolution Chromatography 4 (1981), S. 215-217 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; Direct method for flavor evaluation ; Aromatic herbs analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simple, quick method is described for GC head space evaluation of herbs and drugs. The proposed procedure consists of milling a weighed sample of a certain herb in a glass device like a Braun MXK coffee grinder, modified in such a way that a special gas-tight valve allows the direct sampling of the vapors. Glass capillary columns are used to analyze the head space volatiles. Some preliminary applications of the method are given.
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  • 136
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    Journal of High Resolution Chromatography 4 (1981), S. 232-232 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Static coating ; Sealing method ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 137
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 307-308 
    ISSN: 0935-6304
    Keywords: HPLC ; Quantitative determination of 3,4-dimethylpyridine ; Relative retention times for various alkylpyridines ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 138
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    Journal of High Resolution Chromatography 4 (1981), S. 308-308 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 139
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    Journal of High Resolution Chromatography 4 (1981), S. 323-327 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Deactivation by colloidal aqueous silica plus BTPPC plus Carbowax 1000 ; Use for adsorption-sensitive solutes fails with basic compounds ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Glass capillary columns have been prepared without acidic additive in the stationary phase, from which free organic acids elute as sharp and symmetrical peaks. The required surface in the borosilicate glass capillary was generated by a combination of leaching with aqueous HCl and deposition of colloidal silica particles; it can be coated with stationary phases have a broad range of polarity. Aqueous samples containing free organic acids can also be analyzed in such columns in an isothermal mode.
    Additional Material: 6 Ill.
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  • 140
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    Journal of High Resolution Chromatography 4 (1981), S. 413-414 
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; “Ghost” peak problems and moderate temperature pulses ; Explanation aids correct interpretation of chromatogram ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
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  • 141
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    Journal of High Resolution Chromatography 4 (1981), S. 81-83 
    ISSN: 0935-6304
    Keywords: HPLC bonded phases ; Derivatisation of aminopropyl silica ; Resolution of enantiomers ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
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  • 142
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    Journal of High Resolution Chromatography 4 (1981), S. 91-92 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 143
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    Journal of High Resolution Chromatography 4 (1981), S. 99-101 
    ISSN: 0935-6304
    Keywords: Chromatography ; Laboratory computer use ; Qualified data reduction ; Graphic display of summarized analytical results ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Use of a Hewlett-Packard 2648 A graphics terminal connected to a HP 3354 B Laboratory Automation System for drawing polygon diagrams of chromatographic data has been investigated. The computer program is designed to reduce polygon overlapping and hiding by fully automatic parameter adjustment.
    Additional Material: 3 Ill.
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  • 144
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    Journal of High Resolution Chromatography 4 (1981), S. 122-123 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Fused silica ; Capillary columns ; Deactivation ; Pyrocarbon ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 145
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    Journal of High Resolution Chromatography 4 (1981), S. 138-140 
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, TLC, HPTLC ; Near-side fluorescence ; Far-side fluorescence ; Multilayer model ; Flow chart ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Changes in fluorescence intensity at the far and near side for various spot locations in a sorbent are calculated using a multilayer model and Bodó equations for each sublayer. Flow charts are given for evaluation of reflectance transmission, and fluorescence.
    Additional Material: 5 Ill.
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  • 146
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    Journal of High Resolution Chromatography 4 (1981), S. 520-522 
    ISSN: 0935-6304
    Keywords: Gas chromatography/mass fragmentography ; Capillary column, glass ; Sample preparation for simultaneous assay ; γ-Aminobutyric acid ; Biogenic amines and metabolites in heart, blood, urine of rats ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 147
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    Journal of High Resolution Chromatography 4 (1981), S. 156-163 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, fused silica ; Priority pollutants ; Volatile organics ; Extractable organics ; Pesticides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acrolein, acrylonitrile, volatile organics, base/neutral extractables, acid extractables, and pesticide fraction organics are analyzed in a single chromatographic run. This is accomplished by injecting the extractable organics, then applying a cryogenic focus to the front of the column, and desorbing the volatile components. The column utilized for this procedure is a fused silica open tubular (FSOT) column coated with the liquid phase SE-54. Minimum detection limits of this procedure by electron impact GC/MS are shown to be≤ 1 μg/liter in tests conducted on actual water samples.
    Additional Material: 6 Ill.
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  • 148
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    Journal of High Resolution Chromatography 4 (1981), S. 180-180 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary ; Injector to column connection ; TCDD ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 149
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    Journal of High Resolution Chromatography 4 (1981), S. 186-187 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Effluent splitter, preparation of ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 150
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    Journal of High Resolution Chromatography 4 (1981), S. 191-192 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 151
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    Journal of High Resolution Chromatography 4 (1981), S. 578-579 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Crosslinked silicones ; Peroxide-initiated vulcanization ; Trifluoropylsilicone ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 152
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    Journal of High Resolution Chromatography 4 (1981), S. 583-584 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; 10% CuCl in stationary phase greatly improves resolution of high-boiling olefins (up to 190°C) ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
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  • 153
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    Journal of High Resolution Chromatography 4 (1981), S. 596-600 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 154
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    Journal of High Resolution Chromatography 4 (1981), S. 616-626 
    ISSN: 0935-6304
    Keywords: HPLC ; Video fluorometry ; Emission-excitation matrix ; Spectral deconvolution ; Spectral interpretation ; Polynuclear aromatic hydrocarbons ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A video fluorometer is used as a detector for HPLC to characterize highly complex samples. Data selection and evaluation techniques are discussed so as to speed the spectral identification process. Several well-known polynuclear aromatic hydrocarbons are found in the samples.
    Additional Material: 12 Ill.
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  • 155
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    Journal of High Resolution Chromatography 4 (1981), S. 641-643 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary column ; On-column injection ; Discrimination ; Criteria given for precise sampling ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 156
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, fused silica ; Split injection ; Splitless injection ; Polynuclear aromatic hydrocarbons, quantitation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 157
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    Journal of High Resolution Chromatography 4 (1981), S. 656-657 
    ISSN: 0935-6304
    Keywords: Gas-liquid chromatography ; Dimethylnitrobenzenes ; Polyethers ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
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  • 158
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    Journal of High Resolution Chromatography 4 (1981), S. 661-661 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 159
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    Journal of High Resolution Chromatography 4 (1981), S. 463-464 
    ISSN: 0935-6304
    Keywords: Gas chromatography/Mass spectrometry ; Capillary ; Identification of clavams ; Accurate and relatively fast mass measurments in capillary GC/MS ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 160
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    Journal of High Resolution Chromatography 4 (1981), S. 454-460 
    ISSN: 0935-6304
    Keywords: Reversed-phase mode liquid chromatography ; Rekker's hydrophobic fragmental constant ; Calculation of concentration of organic modifier ; Prediction of retention time ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The utility of Rekker's hydrophobic fragmental constant has been examined for optimization of reversed-phase mode liquid chromatographic separations. The chromatographic behavior of about 60 non-ionic compounds was measured in different acetonitrile/water mixtures and the logarithm of their capacity factors (log k) was correlated with their calculated hydrophobicities (log P). Linear relations were found in each case between log k and log P. The slope of the various lines was related to the percentage concentration of acetonitrile in the mobile phase. It was shown that, by using nine stand ard compounds and measuring their capacity factors in five eluents with different acetonitrile concentrations, the retention time could be predicted for 60 compounds. Calculation of the concentration of the organic modifier was also possible in a system of well coated octadecyl bonded packings with acetonitrile/water mixtures as eluent. Prediction of the capacity factor was accomplished to within 5% error.
    Additional Material: 2 Ill.
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  • 161
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    Journal of High Resolution Chromatography 4 (1981), S. 471-473 
    ISSN: 0935-6304
    Keywords: High performance liquid chromatography ; Triglycerides by UV detection ; Enhanced sensitivity ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 162
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    Journal of High Resolution Chromatography 4 (1981), S. 482-482 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 163
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    Journal of High Resolution Chromatography 4 (1981), S. 489-490 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 164
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    Journal of High Resolution Chromatography 4 (1981), S. 508-514 
    ISSN: 0935-6304
    Keywords: Thin layer chromatography, TLC, HPTLC ; Quantitation ; Curve fitting not possible by conventional least squares techniques ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Analytical results are often obtained from reflectance or fluorescence measurements in TLC or HPTLC with the aid of calibration lines. Curve fitting may not be done by conventional least squares methods for both the independent and the dependent variables are erroneous; errors occur in the volumes spotted on to the plate and in the reflectance/fluorescence measurements. Therefore the sum of the squares of the distances to the calibration line has to be minimized instead of the squared sum of the errors of the dependent variable. The algorithms used are derived and explained. Implications of error propagation for the analytical result are also given.
    Additional Material: 4 Ill.
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  • 165
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    Journal of High Resolution Chromatography 4 (1981) 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 166
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    Journal of High Resolution Chromatography 4 (1981), S. 561-568 
    ISSN: 0935-6304
    Keywords: HPLC ; Video fluorometry ; Fluorescence detector for HPLC ; Data reduction ; Polynuclear aromatic compounds ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A rapid scanning, two-dimensional fluorometer has been used to obtain Emission-Excitation Matrices (EEMs) of the effluent of an HPLC column. These spectra, obtained “on the fly”, provide qualitative as well as quantitative information about unknown samples. An in-depth discussion of the instrumentation developed and an account of data processing alternatives are presented.
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  • 167
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    Journal of High Resolution Chromatography 4 (1981), S. 586-588 
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Air sampling ; 2,4,7-Trinitro-9-fluorenone ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 168
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    Journal of High Resolution Chromatography 4 (1981), S. 589-590 
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, HPTLC ; Reverse and normal phase HPTLC ; Pharmaceutical analysis ; Hexoprenaline ; Dansyl derivative ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 169
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 170
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A15 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 171
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A12 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 172
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Elastoplastic Analysis of Al-B-Composites with Short Fibres Subjected to Uniaxial Tensile LoadingReinforcement of short fibres can successful and economical be analysed when using the finite-element method. In this extensive investigation parameters, as: load, fibre volume, SiC-coating, geometrie of fibre cup and unbonding at fibre tip are studied with respect to elastoplastic deformation of the composite. The results are compared with analytical solution, such as the rule of mixture e.g. Furthermore the authors are analysing in detail the stress concentration along fibrematrix interface and discuss generally finite-element solutions in regions with high stress gradient; in this context a method of averaging is proposed. Each elastoplastic deformation of a composite produces a change of the strain-energy (Formänderungsarbeit); therefore reinforcement of composites can better be understood by the strain-energy than by the usually calculated plastification area around fibre tip e.g. With respect to minimal weight of a short-fibre composite the results of the plane finite-element model were used to find out fibre size of an equivalent axysymmetrical model. Similar as in the plane model, the matrix material flows at lower loads than predicted by the rule of mixture.
    Notes: Anhand umfangreicher parametrischer Finite-Elemente-Rechnungen wird in Abhängigkeit von Belastung, Faservolumenanteil, SiC-Beschichtung, Faserendengeometrie und unvollständigem Haften an der Faserstirnfläche die elastische und elastoplastische Beanspruchung des Al-B-Verbundwerkstoffs untersucht, wobei unter anderem auch ein Vergleich mit der sog. Mischungsregel erfolgt. Bei kurzfaserverstärkten Werkstoffen kommt dem Werkstoffverhalten im Bereich des Faser-Matrixübergangs besondere Bedeutung zu. Als problematisch erweist sich in diesem Zusammenhang die Interpretation von Finite-Elemente-Lösungen im Bereich von Spannungskonzentrationen, so daß hier eine geeignete Mittelung vorgeschlagen wird. Ferner zeigt sich, daß zur Beschreibung der Beanspruchung des Matrixwerkstoffs die übliche Angabe der plastizierten Fläche allein nicht ausreicht, sondern der Verlauf der Formänderungsarbeit angegeben werden sollte. Im Hinblick einer sicheren Auslegung von Al-B-Verbundwerkstoffen werden die Ergebnisse des ebenen Modells auf ein axialsymmetrisches Modell mit diskontinuierlichen Fasern übertragen. Gegenüber den Berechnungen nach der Mischungsregel wird dabei eine vorzeitige Plastizierung des Matrixwerkstoffs ermittelt.
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  • 173
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 142-150 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Surface Alloying of Tool Steels with Carbides by Laser or Electron Beam Melting.It is shown how the properties of tool steels can be improved by laser or electron beam melting and alloying of the surface. Various techniques can be employed depending on the base material and intended application. Crack free surface treated layers 1-1.5 mm thick can be produced. The hardness profiles, structures and oxidation resistance of these layers are compared for the different techniques and materials.
    Notes: Die vorliegende Arbeit zeigt, wie sich die Oberflächen von Werkzeugstählen durch Umschmelzen und Oberflächenlegieren mittels eines Laser/Elektronenstrahls veredeln lassen.Je nach Grundmaterial und beabsichtigtem Einsatz lassen sich durch verschiedene Techniken und geeignete Prozeßführung rißfreie Oberflächenschichten mit einer maximalen Schichtdicke von 1-1,5 mm herstellen.Härteprofile, Gefügeausbildung und Zunderbeständigkeit, die sich bei den verschiedenen Techniken erzielen lassen, werden gegenüber gestellt.
    Additional Material: 11 Ill.
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  • 174
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Size Effect and Fatigue Properties with Respect to Optimized Surface-Treatment.A hyperbolic function describes the geometrical size effect of notched specimens made from heat treated steel.An estimation of fatigue properties of components under one level fatigue tests is possible, if there are comparable materials and surface properties. The fatigue properties of specimens are well described by standardized stress-N graphs. The slope of the stress-N graphs in the range of load cycle depends on the concentration factor and not on the size effect.The fatigue properties of components are largely increased by thermal and mechanical surface strengthening. For the determination of the improvement of fatigue properties it is important to known the initiation of cracking. The improved fatigue properties of inductive surface hardened smooth specimens can be explained by the initiation of cracking below the surface. Mechanically strengthened notched specimens start cracking on the surface. The increase of fatigue properties for these specimens is explained by compressive residual stresses.The fatigue properties of notched specimens can be improved by the optimisation of mechanical strengthening, to higher values than for smooth surface strengthened specimens. This is due to compressive residual stresses. They decrease the tensile stresses which are responsible for crack propagation. If the tensile stress is below fatigue limit for initiation of cracking the crack arrests immediately.
    Notes: Der geometrische Größeneinfluß von Kerbstäben aus Vergütungsstählen folgt einer Hyperbelfunktion, so daß bei vergleichbaren Werkstoff- und Oberflächeneigenschaften sowie Spannungsformzahlen die Dauerfestigkeitseigenschaften von Bauteilen unter Einstufenbean-spruchung sicher abgeschätzt werden können. Die Schwingfestigkeitseigenschaften von Kerbstäben aus Vergütungsstahlen im Zeit- und Dauerfestigkeitsbereich lassen sich durch normierte Wöhlerkurven gut beschreiben, wobei das Steigungsmaß der Zeitfestigkeitsgeraden größeneinflußunabhängig ist und nur von der Spannungsformzahl abhängt.Durch thermische sowie mechanische Oberflächenverfestigungsverfahren können die Schwingfestigkeitseigenschaften von Bauteilen beträchtlich gesteigert werden, wobei der Lage des Anrißortes für die Deutung der Schwingfestigkeitssteigerung eine große Bedeutung zukommt. Während bei induktive randschichtgehärteten glatten Proben bei Umlaufbiegebelastung durch die Verlagerung des Anrißortes unter die Oberfläche die Steigerung der Schwingfestigkeitseigenschaften erklärt werden kann, geht bei mechanisch oberflächenverfestigten Kerbproben die Anrißbildung von der Oberfläche aus, und durch die Verschiebung der Mittelspannung infolge Druckeigenspannungen 1. Art wird eine beachtliche Steigerung der Dauerfestigkeit erzielt. Durch Drückkraftoptimierung kann die Dauerschwingfestigkeit von Kerbproben über die Schwingfestigkeit glatter, oberflächenverfestigter Proben angehoben werden, so daß die Kerbwirkung aufgehoben wird. Dies kann damit erklärt werden, daß durch die Wirkung von Druckeigenspannungen 1. Art die für den Rißfortschritt notwendige Zugspannung unterhalb der Anrißdauerfestigkeit von Kerbproben bleibt und ein Rißstopp bewirkt wird.
    Additional Material: 10 Ill.
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  • 175
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 155-160 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zugfestigkeit eutektischer, gerichtet erstarrter Superlegierungen auf Co—Cr—C-BasisEs wurde der Einfluß verschiedener Legierungselemente auf die Festigkeit der eutektischen, gerichtet erstarrten Superlegierung 73 C ermittelt. Bei der Grundlegierung konnten Festigkeitssteigerungen bei Zulegierung von Al, Y und C erreicht werden. Ni und Ti wirken bei höheren Gehalten entfestigend, beeinflussen jedoch Duktilität und thermische Ermüdung in positiver Weise. Es werden die Mechanismen angegeben, durch die die Legierungselemente die Grundlegierung beeinflussen.
    Notes: The influence of various alloy elements on tensile strength of the eutectic, directionally solidified superalloy 73 C was determined. The tensile properties of the base alloy had been increased by Al, Y and C as alloying elements, while Ni and Ti showed a decreasing effect (alloy softening). However, ductility and thermo-fatigue behaviour had been influenced in a positive way be these elements. The specific mechanisms caused by the different elements are discussed.
    Additional Material: 9 Ill.
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  • 176
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A39 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 177
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A42 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 178
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 219-225 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion Behaviour of Copper in Water-Systems and in the Case of Heat-Exchanging ConditionsFirstly the wellknown theories of copper corrosion are described. The results of own examinations of copper tubes corroded by different tapwaters show, that in case of corrosion the reason is not to find in rests of cracked drawing compounds. The damages are released much more by bad soldered and brazed copper tubes. In this case (by the different reasons described) soldering flux gets into the copper tube and becomes cracked by the soldering temperature, and the line of attack at the tube wall (consisting of decomposition products from the soldering flux) is clearly to detect.Own laboratory tests with potential-current density studies (potentiostatic and potentiodynamic) show the following results: - At heat-exchanging conditions the mass loss is greater than in immersion tests. - The copper surface layer formation is very dependent from potential value. - The potential-current density of copper is very dependent from the water hardness.
    Notes: Die gängigen Theorien zum Korrosionsverhalten von Kupfer werden einleitend dargestellt (Flächenkorrosion, Lochkorrosion nach Typ I and Typ II).Ergebnisse aus eigenen Schadenuntersuchungen an Kupferrohren aus der Wasserinstallation zeigen, daß die meisten Korrosionsschäden an Kupferrohren nicht aus den Resten gecrackter Ziehmittelrückstände resultieren. Vielmehr werden die Schäden in der Regel durch eine nicht fachgerechte Verlötung der Rohre ausgelöst. Dabei gelangt, aufgrund unterschiedlichster Ursache, Flußmittel in das Rohrinnere und wird durch die Löttemperatur gecrackt. Die so entstandenen Korrosionsstellen finden sich dann bahnförmig von der Lötstelle ausgehend an der Rohrinnenwand.Eigene Laborversuche mit Stromdichte-Potentialuntersuchungen (potentiostatisch und potentiodynamisch) zeigen folgende Ergebnisse: - Bei Wärmetauschung ist der Massenverlust deutlich größer als bei eingetauchten Proben. - Die Deckschichtausbildung von Kupfer ist stark potentialabhängig. - Die Stromdichte - Potentialcharakteristik von Kupfer ist stark abhängig von der Wasserhärte.
    Additional Material: 12 Ill.
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  • 179
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 244-249 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Investigations Concerning the Minimal Experimental Expenditures for Fatigue Tests on Wheels for Friction DrivesResults of fatigue tests on wheels for friction drives show always great scatter. The reliable experimental evaluation of the interesting scatterregions (scatter at constant stress in the range of finite life or the width of the range of transition) demands a great number of samples. In practice minimal experimental costs are aimed at and therefore the general possibilities of lowering the necessary number of samples are discussed on the example of a friction drive. The reduction of the numbers of samples, levels of load and the limiting value of stress cycles endured are especially investigated in the range of transition. Considerations concerning the reduction of the levels of load to minimal two lead to a method of testing known as „boundary technique“ from the literature. Some remarks are made to the statistical background of this method.
    Notes: Bei Lebensdaueruntersuchungen an Wälzrädern ist mit einer erheblichen Streuung der Versuchsergebnisse zu rechnen. Daher erfordert die zuverlässige experimentelle Bestimmung interessierender Streubereiche (entweder die Streuung bei konstanter Beanspruchung im Zeitfestigkeitsgebiet oder die Breite des Übergangsgebietes) große Probenzahlen. In der Praxis wird ein minimaler Versuchsaufwand angestrebt. Es werden daher am Beispiel eines Wälzgetriebes Möglichkeiten diskutiert, wie der Probenbedarf fühlbar gesenkt werden kann, ohne zuviel an Information zu verlieren. Speziell untersucht wird im Übergangsgebiet die Reduzierung der Probenzahl, der Laststufenzahl und der Grenzlastspielzahl. Überlegungen zur Verminderung der Laststufenzahl bis auf minimal 2 Stufen führen schließlich im Kern auf eine Versuchsmethode, die als „Abgrenzungsverfahren“ in der Literatur bekannt wurde. Zum statistischen Hintergrund dieses Verfahrens werden einige kritische Anmerkungen gemacht.
    Additional Material: 8 Ill.
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  • 180
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 250-256 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Investigations on the Influence of Sodium on the creep Rupture and Creep Behaviour of the Steel X5 CrNi 18 9 (AISI 304, W.-No. 1.4301) at 823 KWe did not observe any effects of sodium on the time to rupture, the time to reach limited strain and the creep rate of steel X5 CrNi 18 9 (AISI 304, W.-No. 1.4301) in creep rupture tests at 823 K in flowing sodium up to 2000 hours exposure time. Only the fracture mode is influenced by the liquid sodium. Sodium causes intercristalline precracking, the ultimate strain values are somewhat reduced. Exchange of carbon or nitrogen did not occur to such an extent that it could affect the mechanical properties.
    Notes: In den Zeitstand- und Kriechversuchen an dem Stahl X5 CrNi 18 9 (1.4301, AISI 304) bei 823 K in strömendem Natrium wurde bis zu Auslagerungszeiten von über 2000 Stunden kein Effekt auf die Standzeit, die Zeitdehngrenzen und die Kriechgeschwindigkeit beobachtet. Lediglich das Bruchverhalten des Stahls wird durch Natrium verändert. Natrium verursacht interkristallinen Anbruch, die Bruchdehnung wird dadurch verringert. Kohlenstoff oder Stickstoff wurden dabei nicht mit dem Natrium in einem Maße ausgetauscht, daß Auswirkungen auf die mechanischen Eigenschaften eintreten konnten.
    Additional Material: 14 Ill.
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  • 181
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 263-271 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Extrusion Manufacturing Possibilities of Fibre Composite Materials like the Combination Metal/GraphiteThese paper discusses the possibilities of manufacturing composite materials by common extrusion of envelope tubes and wrapped wires. Experimental results are given and analysed from the material combination graphite/metal.If a great lot of thin wrapped wires are concentrated in an envelope tube (“multi-core” coextrusion), perfect indirect coextrusion only will be possible, if the compound billet is compacted before extrusion. If few thick wrapped wires are concentrated in an envelope tube (“polycore” coextrusion), perfect indirect coextrusion is possible without compacting the compound billet before extrusion. Through indirect reiterate extrusion, using always the same tools and the same small extrusion ratio, it is possible to get a good product only by extrusion. Hydrostatic “multi-core” coextrusion is possible without compacting the compound billet, but the billet preparation needs more work. The envelope tube must have a solid top with the same angle like the die. It is effective to use dies with small angles. The manufacturing of wrapped wires only by extrusion is possible and effective. All variations of extrusion are available for employment.There is no difference in structure between products manufacturing by “multi-core” coextrusion or by drawing.From the geometrical configuration of the wrapped wires in the envelope tube results a different structure by use of indirect reiterate coextrusion.
    Notes: Möglichkeiten der Verbundwerkstoffherstellung durch Strangpressen von Manteldrahtbündeln werden erörtert und am Beispiel der Werkstoffkombination Metall/Graphit experimentell untersucht.Werden dünne Manteldrähte in großer Anzahl in einem Hüllrohr gebündelt (Vieldrahtverbundpressen), so ist ein indirektes Verbundpressen dann möglich, wenn der Block vorkompaktiert wird.Werden relativ dicke Manteldrähte in geringer Anzahl in einem Hüllrohr gebündelt (Mehrdrahtverbundpressen), so ist ein indirektes Verbundpressen ohne Vorkompaktierung des Blockes möglich.Durch wiederholtes indirektes Strangpressen im gleichen Werkzeugsatz läßt sich bei kleinen geometrischen Verpressungsverhältnissen ein Produkt zufriedenstellender Qualität ausschließlich durch Strangpressen herstellen.Ein hydrostatisches Vieldrahtpressen ist auch ohne Blockvorkompaktierung möglich, jedoch erfordert die Blockvorbereitung dadurch größeren Aufwand, daß das Hüllrohr eine angearbeitete, dem Matrizenwinkel angepaßte, Spitze besitzen muß. Bei diesem Verfahren ist es zweckmäßig, Matrizen kleinen Einlaufwinkels zu verwenden.Die Manteldrahtherstellung durch Strangpressen ist möglich und zweckmäßig. Alle Varianten des Strangpressens können hierzu herangezogen werden.Die erzielbaren Verbundwerkstoffstrukturen entsprechen beim Vieldrahtpressen in ihrer Gleichmäßigkeit denen, die bei der Fertigung durch Ziehen erhalten werden. Diese ausgezeichnete Geometrie wird beim Wiederholungspressen nicht ganz erreicht.
    Additional Material: 14 Ill.
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  • 182
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A66 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 183
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 301-308 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Dual-Phase Steels with Improved Strength and Ductility.The term “dual-phase steel” refers to a new class of steels with a special ferritic-martensitic microstructure, which offers a superior combination of good formability, particularly concerning deep-drawing, and of high tensile strenght. This paper describes the alloys and the thermomechanical treatment to process a dual-phase microstructure. Comparing tensile tests of dual-phase structures and other ferritic-martensitic structures, factors are analysed which determine the typical mechanical properties of dual-phase structures. Their optimum mechanical properties of dual-phase structures. Their optimum mechanical properties, which are found to be better than those of conventional high-strength steels are due to the topology of the microstructure and to the addition of the unusual alloying element phosphorus. These new steels are of interest to all automobile manufactures because weight reduction of auto-body parts can be realized. The future perspectives for the application of dual-phase steels are discussed.
    Notes: Bei dem „Dualphasen-Stahl„ handelt es sich um einen neuen Stahltyp mit einem speziellen ferritisch-martensitischen Gefüge, der sich durch eine hervorragende Kombination von hoher Verformungsfähigkeit insbesondere beim Tiefziehen und hoher Zugfestigkeit auszeichnet. In dieser Arbeit werden Legierungen und thermomechanische Behandlungen zur Herstellung des Dualphasen-Gefüges dargestellt. Weiterhin werden durch vergleichende Zugversuche von Dualphasen-Gefügen und anderen ferritisch-martensitischen Gefügen Beiträge aufgezeigt, die zu den typischen Eigenschaften des Dualphasen-Stahls führen. Die optimalen mechanischen Eigenschaften des neuen Stahltyps, in denen er den herkömmlichen mikrolegierten hochfesten Blechen überlegen ist, ergeben sich zum einen aus seiner besonderen Gefügetypologie als auch durch den Zusatz des unüblichen Legierungselements Phosphor. Großes Interesse hat dieser neue Stahltyp deshalb in der Autoindustrie gefunden, weil eine Gewichtsersparnis an Karosseriebauteilen erreicht werden kann. Abschließend werden die Zukunftsaussichten für den Einsatz von Dualphasen-Stählen abgeschätzt.
    Additional Material: 11 Ill.
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  • 184
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A74 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 185
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 337-344 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Calculation of Thermal Processes in Flash Butt WeldingFor the calculation of the thermal processes in flash butt welding the Fourier equation for heat conduction is used paying regard to resistance heating.With a model of calculation the assumptions and simplifications made can be explained. Cooling of the clamps, losses by flashing and heat transfer are taken into account. The input of heat at the gap can be treated as a flat heating source. Particularities with respect to preheating, flashing and cooling may be introduced into the calculation by corresponding inital and boundary conditions. As a result we get the dependence of temperature on the welding parameters. Experiment and calculation are in good agreement.
    Notes: Zur Berechnung der Wärmevorgänge beim Abbrennstumpfschweißen wird in der Fourierschen Wärmeleitungsgleichung die Widerstandserwärmung berücksichtigt.An einem Berechnungsmodell lassen sich die getroffenen Annahmen und eingeführten Vereinfachungen erläutern. Spannbackenkühlung, Abbrenn- und Wärmeübergangsverluste werden berücksichtigt, die Wärmezufuhr im Schweißspalt läßt sich durch eine ebene Wärmequelle erfassen. Die beim Vorwärmen, Abbrennen und Abkühlen auftretenden Besonderheiten werden durch Anfangs- und Randbedingungen in die Berechnung einbezogen. Als Ergebnis erhält man die Abhängigkeit der Bauteiltemperatur von den Schweißparametern. Experiment und Rechnung zeigen gute Übereinstimmung.
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  • 186
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A84 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 187
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Fracture Toughness and Fatigue Crack Growth of Cast IronsFracture toughness, elastic moduli and fatigue crack growth rates in air and in vacuum were measured for 17 different cast irons. The graphite shape in the cast irons varied from flakes to nodules, the matrix varied from ferrite to pearlite to martensite. In the fatigue crack growth rate tests, using fracture mechanics methods, it was observed that the fatigue crack growth rate increases significantly as the cyclic stress intensity range approaches the critical value for stable crack growth. This phenomenon was used to determine the fracture toughness of the cast irons. Such toughness data agree well with literature data on the fracture toughness of cast irons. An extensive review of the effects of strength on the fracture toughness of commercial cast irons is presented.In cast irons with flake graphite, cyclic loading results in a reduced modulus of elasticity. This is attributed to the rupture of the graphite flakes under cyclic loading.
    Notes: Bruchmechanische Werkstoffkenngrößen von 17 Eisen-Kohlenstoff-Gußlegierungen der folgenden Sorten wurden in der vorliegenden Arbeit bestimmt: Gußeisen mit Lamellengraphit, Gußeisen mit Kugelgraphit, Temperguß und Stahlguß. Die Geschwindigkeit des Ermüdungsrißwachstums, Δa/ΔN wurde in Luft und Vakuum in Abhängigkeit von der Schwingbreite der Spannungsintensität ΔK gemessen und mit einer Vorhersage für graphitfreie Werkstoffe verglichen. Dabei zeigt sich ein beschleunigtes Rißwachstum bei hohen Spannungsintensitäten dort, wo stabiles Rißwachstum aufgrund des Aufbrechens von Graphit einsetzt. Aus dem meßbaren Beginn des stabilen Rißwachstums läßt sich die kritische Spannungsintensität, die Bruchzähigkeit bestimmen. Ein Vergleich mit zahlreichen Literatur-Meßwerten der Bruchzähigkeit zeigt sehr gute Übereinstimmung. Damit wird eine sehr weitgehende Übersicht über die Bruchzähigkeit der wesentlichsten technischen Gußeisensorten möglich. Aus dieser übersicht ergibt sich, daß die Bruchzähigkeit von Gußeisen mit Zugfestigkeiten zwischen 300 und 500 MN/m2 besonders stark vom Gefüge abhängt und möglicherweise beeinflußt werden kann. Die Bruchzähigkeit von Grauguß steigt an mit steigender Zugfestigkeit. Zu einem vertieften Verständnis dieser Erscheinung sind fraktographische und gezielte bruchmechanische Untersuchungen notwendig.Für alle untersuchten Gußeisen wurde der Elastizitätsmodul nach dem Verfahren der Nachgiebigkeit angerissener Proben bestimmt. Die Meßwerte stimmen gut mit den nach anderen Methoden gewonnenen Literaturdaten überein. Für Gußeisen mit Lamellengraphit ergibt sich außer dem E-Modul im Ursprung noch ein zweiter, niedrigerer E-Modul nach zyklischer Dehnung.
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 407-410 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Material Research and Design of Components as seen by a Design EngineerThe solution of design problems makes it necessary to include the results of different engineering subjects. In this report it has been tried to put forward general requirements for the preparation and presentation of research results in the field of material research. Apart from an amelioration in information exchange between experts and engineers it seems useful to do a major part of this work, definition of problems and presentation of result, within a new engineering subject „operationally oriented design“.
    Notes: Die Lösung von Dimensionierungsaufgaben erfordert die Einbeziehung der Ergebnisse verschiedenster Fachgebiete. Für den Bereich der Werkstofforschung wurde versucht, allgemeine Forderungen an die dazu notwendige Aufbereitung und Präsentation von Forschungsergebnissen abzuleiten. Neben einem verbesserten Informationsaustausch zwischen Fachleuten und Praktikern erscheint es langfristig zweckmäßig, einen Teil der erforderlichen Problemformulierung und Ergebnisdarstellung im Rahmen eins neu zu schaffenden Forschungs- und Lehrgebiets „Betriebsgerechtes Dimensionieren“ vorzunehmen.
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 421-431 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A comprehensive presentation of the theory of galvanostatic anodization has been given in order to enable interpretation and prediction of the anodization behaviour of barrier layers during technical work on various value metals. The following parameters have been considered, and the relations between them have been established: (i)oxide formation rate,(ii)reciprocal capacity,(iii)electric field strength,(iv)pre-polarization oxide thickness,(v)interfacial potentials,(vi)the height and width of energy barrier for ion transport in the oxide phase,(vi)the oxide growth rate as derived from the dependence of cd on time under constant potential, and(vii)capacity.Furthermore, it has been demonstrated that potentiostatic curves can be derived from galvanostatic results, and the derived curves are similar to those directly measured by the potentiostatic technique. The theory has been satisfactorily applied to the experimental results based on the anodic charging curves and other complementary measurements on a large number of valve metals including Nb, Ta, Zr, Ti, Al, W, Te, Sb, and Bi.
    Additional Material: 12 Ill.
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  • 190
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 450-450 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 84-87 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Elektrochemische Bestimmung der Oxidation von Tantal in Chromat-LösungenDie anodische Oxidation von Tantal in Chromat-Lösungen wurde elektrochemisch bei Stromdichten zwischen 200 und 700 m̈A/cm2 gemessen. Es zeigte sich, daß das Schichtwachstum aus Zellenspannung und Behandlungszeit bestimmt werden kann. Ergebnisse von Untersuchungen über die Schichtbildung, Schichtdicke, Feldstärke und Kapazität in Abhängigkeit von Badparametern werden beschrieben und diskutiert.
    Notes: Anodic oxide growth has been followed on Ta in chromate solutions by measuring the cell voltage/time relations at current densities between 200 and 700 m̈A/cm2. It is demonstrated here that the reference electrode can be dispensed with for technical studies, and estimates for the parameters of oxide growth can be calculated from cell voltage/time relations. Results are given for the formation rate, electric field strength, reciprocal capacity and increase of oxide thickness. The formation rate has been found to depend on current density following the empirical relation previously established for valve metals from the results of anodic charging curves. The empirical constants calculated here agree with the values in the literature, thus showing that cell voltage measurements can be used successfully to estimate growth parameters.
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 105-106 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 1 Ill.
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 96-104 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Basic Aspects to Improve Ultrasonic Signals by Means of the CS- Technique for Testing Coarse Grained MaterialsThe influences of band width and centre frequency of ultrasonic pulses on the detection and evalution of defects in coarse grained materials are discussed. Theoretical calculations and experiments with artificial defects demonstrate the existence of optimum frequency ranges, within the transition range from reflection to scattering. By applying CS-pulses (controlled signals) these frequency ranges can be used in order to improve the signal-noise ratio. Guide-lines to optimize the pulses in ultrasonic testing of coarse grained materials are presented and discussed.
    Notes: Zum Einfluß der Bandbreite und der Mittenfrequenz von Ultraschallimpulsen auf den Nachweis und die Bewertung von Fehlstellen in schallstreuenden Werkstoffen werden sowohl theoretische Grundlagen als auch Versuchsergebnisse vorgestellt. Beide weisen an Modellfehlern nach, daß optimale Frequenzbereiche für die Prüfung im Übergangsbereich von Reflexion zu Streuung existieren, sofern die Streuung der Werkstoffe im Rayleigh-Bereich liegt. Diese Bereiche lassen sich mit der CS-Technik (controlled signals) gezielt zur Anhebung der Signal/Rausch-Verhältnisse, sowie zu einer verbesserten Fehlerbewertung ausnützen. Die sich hieraus ergebende Vorgehensweise zur Optimierung der Impulsparameter bei der Prüfung schallstreuender Werkstoffe wird vorgestellt und diskutiert.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 108-108 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 109-109 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A31 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A71 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 335-335 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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    Materialwissenschaft und Werkstofftechnik 12 (1981), S. A74 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981) 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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