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  • 1
    ISSN: 1432-1440
    Keywords: Oxygen pressure ; occlusive vascular disease ; Gewebe-Sauerstoffdruck ; arterielle Verschlußkrankheit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei Patienten mit chronischen arteriellen Verschlußkrankheiten wurde mit Mikro-Platin-Elektroden der mittlere Sauerstoffdruck ( $$\overline {pO_2 } $$ ) im M. tibialis unter Ruhebedingungen gemessen und die Werte mit entsprechenden Messungen an einem gefäßgesunden Kollektiv verglichen. Zwischen beiden Kollektiven konnten statistisch hoch-signifikante Differenzen der $$\overline {pO_2 } $$ -Werte nachgewiesen werden. Die Messung des Gewebesauerstoffdruckes mit Mikro-Pt-Elektroden kann bei klinischen Untersuchungen als geeignete Methode zur quantitativen Beurteilung sowohl des Ischämiegrades als auch der Wirkung therapeutischer Maßnahmen angesehen werden.
    Notes: Summary The local oxygen pressure of muscle tissue was measured in 10 patients with occlusive atherosclerosis and in 9 healthy volunteers using a micro-Pt-electrode. In 3 cases, the muscular pO2 values of an ischemic leg were compared to the non-ischemic leg of the same patient. In both groups, there was a statistically significant difference in the oxygen pressure of the muscle tissue in normal legs of volunteers as compared to the ischemic legs. Measurements of the local oxygen pressure in the muscle enables us to have a quantitative measure for the ischemic situation. It is a useful diagnostic method in patients suffering from ischemic claudication and seems to be an objective criterium of therapeutical methods.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 4700-4702 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Josephson voltage standards utilize microwave-induced constant voltage steps in the dc characteristic of Josephson tunnel junctions. This paper describes the design and operation of array circuits with 108 and 2000 junctions connected in series. In contrast with similar realizations, simple Q-band equipment is used for the microwave supply. The microwave attenuation of 1000 junctions was about 1 dB. The version with 2000 junctions generated Josephson voltages up to 1.2 V when operated at 35 GHz. The stability times of the quantized levels were, under normal laboratory conditions (unshielded room), better than 10 min.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 86 (1982), S. 3269-3271 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 337 (1995), S. 451-455 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New crown compounds 3-5 comprising beside ophenylene groups 1,8-naphthyridine or 4-pyridone groups as characteristic building units are synthesized. They form numerous stoichiometric crystalline complexes with uncharged organic molecules including alcohols, nitro compounds and other dipolar-aprotic solvents, as well as cyclic ethers and aromatic hydrocarbons. Properties of complex formation and host-guest stoichiometries are discussed making a comparison with parent host analogues.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 32 (1981), S. 371-376 
    ISSN: 0947-5117
    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 martensitic stainless steel with high strength and impact properties for chemical and mechanical engineering purposesWithin the last few years the low carbon martensitic stainless steel X4CrNiMo 165, WNr. 1.4418, is increasingly used due to it's excellent technological properties. The steel can he offered with tensile strength up to 850 N/mm2 and yield strength up to 1000 N/mm2 together with superior impact properties at room temperature and sub-zero-temperature. So this steel has special significance concerning chemical engineering, where corrosion resistance as well as high tensile and impact values are demanded.There is no selective corrosion attack in boiling sulfuric acid (Strauß-Test), if the material is quenched and tempered correctly.Welding operations may be done without preheating the material.
    Notes: Der martensitisch vergütbare Werkstoff X 4 CrNiMo 165, WNr. 1.4418, findet als nichtrostender walz- und schmiedbarer Stahl aufgrund seiner ausgezeichneten Festigkeits- und Zähigkeitseigenschaften zunehmend Anwendung in mechanisch hochbeanspruchten Teilen des chemischen Apparatebaus und Maschinenbaus. Der Stahl ist bis zu Wanddicken von über 250 mm gleichmäßig durchvergütend. Bei 0,2%-Dehngrenzen über etwa 800 N/mm2, Zugfestigkeiten von etwa 1000 N/mm2 weist er Kerbschlagarbeitswerte über 60 J (DVM) bei Raumtemperatur auf. Darüberhinaus weist er hohe Kaltzähigkeit bis -400°C auf.Nach sachgemäßer Vergütungsbehandlung ist er beständig gegen selektiven Angriff im Strauß-Test nach DIN 50914.Er besitzt gute Schweißeignung.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It is pointed out by using the IRDO treatment of Jesaitis et al. that the failure of the CNDO/2 method in predicting the acidity difference between toluene and β-picoline has its reason in the incorrect handling of the nitrogen lone pair. To predict correctly the relative acidity of β-picoline, it is necessary and sufficient to include only those NDDO terms into the IRDO calculation which contain interactions with the nitrogen. The most important interactions are those between the nitrogen and the three centers of the heterocycle which take over a large part of the negative charge in the corresponding β-delocalized carbanion.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 27 (1985), S. 781-786 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Systematic ab initio LCAO MO calculations with basis sets of increasing size have been performed to analyze the changes in relative stabilization energies of the two cyclic (D3h and C3h symmetry) and the noncyclic HF trimers. The results form the basis for a discussion of cyclic H-transfer reactions.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 25 (1984), S. 1055-1060 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The CNDO/BW modification of the CNDO/2 approximation was used within the PCILO framework. It was shown on some significant examples that all the good results of the original PCILO-CNDO/2 method can be reproduced by the modified version PCILO-CNDO/BW at least. Thus, preserving the quality of its results a computer-expense-reduced PCILO method is proposed for calculations on large molecular systems.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 119-124 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The chemical shifts of methyl protons of 51 methyl and tert-butyl substituted cyclohexanes were determined. The resonance range of axial methyls extends from δ = 0,63 to 0,98 ppm and equatorial groups from δ = 0,81 to 1,02 ppm. the chemical shifts of axial methyl groups are more greatly influenced by neighbouring groups than those of equatorial methyls. The shift effects of alkyl groups on the chemical shifts of methylprotons and ring protons were compared.
    Notes: Die chemischen Verschiebungen der Alkylprotonen von 51 methyl- und tert-butyl-substituierten Cyclohexanen wurden bestimmt. Der Resonanzbereich axialer Methyl-gruppen erstreckt sich von δ = 0,63 bis 0,98 ppm, der von äquatorialen von δ = 0,81 bis 1,02 ppm. Die chemischen Verschiebungen axialer Methylgruppen werden durch Nachbargruppen stärker beeinflusst als die der äquatorialen Methylgruppen. Die Shifteffekte von Alkylgruppen auf Methylprotonen werden mit denen auf Ringprotonen verglichen.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 313 (1971), S. 1101-1109 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mit einem Allvalenzelektronen-SCF-Verfahren - der INDO-Methode - wird die Elektronenstruktur des Tri- und Pentamethincyanins untersucht. An ausgewählten Modellen wird für die möglichen geometrischen Anordnungen der Trimethincyanin-Einzelmoleküle in Doppelmolekülen die relative energetische Stabilität abgeschätzt. Die Berechnungen bestätigen die schon früher festgestellte starke Ladungsalternation und einen weitestgehenden Bindungsausgleich entlang der Polymethinkette. Die Elektronendichteverteilung wird duch die Zusammenlagerung von Trimethincyaninmolekülen zu Doppelmolekülen wenig verändert. Das Modell mit einer „mauerwerkartigen“ Anordnung erweist sich als das stabilste.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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