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  • 1
    Electronic Resource
    Electronic Resource
    The Synthesis and Properties of Diphenylcyclopropenyldiazomethane, and a Structural Reassignment for the So-called Diphenyltetrahedrane (1966)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 88 (1966), S. 611-612 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00955a044
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Calcium- und Knochenstoffwechsel nach Gastrektomie (1997)
    Springer
    Der Chirurg 68 (1997), S. 784-788 
    Details
    ISSN: 1433-0385
    Keywords: Key words: Calcium metabolism ; Bone metabolism ; Gastrectomy ; Therapy ; Review. ; Schlüsselwörter: Calciumstoffwechsel ; Knochenstoffwechsel ; Gastrektomie ; Therapie ; Übersicht.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Nach Magenresektion oder Gastrektomie sind Störungen der Calcium- und Knochenstoffwechsels bekannt. Wahrscheinlich kommt es postoperativ aufgrund einer verminderten Calciumabsorption zu einem Abfall des Serumcalciums. Als Gegenregulation wird Parathormon ausgeschüttet und 1,25-(OH)2-Vitamin D neu gebildet, welche beide Calcium aus dem Knochen mobilisieren. Bei einem Teil der Patienten kommt es in der Folge zu einer Abnahme der Knochenmasse mit einem erhöhten Frakturrisiko. Bisher liegen keine anerkannten Behandlungsempfehlungen dieser Störungen vor, lediglich die Substitution von Vitamin D und Calcium wurde wiederholt empfohlen. Es wird eine Übersicht über die derzeitigen Vorstellungen zur Regulation des Calcium- und Knochenstoffwechsels nach Gastrektomie gegeben.
    Notes: Summary. Disturbances in calcium and bone metabolism after gastrectomy have long been recognized. It has been suggested that due to impaired calcium absorption after gastrectomy, serum calcium is decreased, being counterregulated by parathyroid hormone release and 1,25-(OH)2-vitamin D formation. Both parathyroid hormone and 1,25-(OH)2-vitamin D are known to release calcium from bone, resulting in bone mass loss and increased fracture risk in some of the gastrectomized patients. No therapy is currently generally agreed on, although supplementation of vitamin D and calcium has been suggested repeatedly. A review on the current understanding of calcium and bone metabolism after gastrectomy is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001040050270
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Neutronenbeugung an Na2Si2O5-, Na2SiO3- und SiO2-Glas und die Additivität der Intensitätsdaten (1966)
    Springer
    Naturwissenschaften 53 (1966), S. 16-17 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00607620
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Symmetric Galerkin boundary element method in plasticity and gradient plasticity (1995)
    Springer
    Computational mechanics 17 (1995), S. 115-129 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A boundary integral equation (BIE) formulation and a boundary element (BE) method which confer symmetry to key operators are concisely described with reference to quasi-static plasticity. This formulation is based on the combined use of static and kinematic sources, on Galerkin weighted residual enforcement of integral equations for displacements and tractions along the boundary and for stresses in the potentially yielding domain and on space discretizations in terms of generalized variables in Prager's sense. Typical theoretical results of computational interest not available in conventional nonsymmetric BE methods are surveyed. The subjectivity (mesh-dependence) implied by material instability is illustrated by examples. As a remedy, a symmetric BIE-BE formulation for nonlocal, gradient-dependent plasticity is developed and discussed on the basis of its variationally consistent discretization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356484
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  • 5
    Electronic Resource
    Electronic Resource
    A symmetric boundary integral approach to transient poroelastic analysis (1997)
    Springer
    Computational mechanics 19 (1997), S. 169-178 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The problem of the transient quasi-static analysis of a poroelastic body subjected to a history of external actions is formulated in terms of four boundary integral equations, using time-dependent Green's functions of the “free” poroelastic space. Some of these Green's functions, not available in the literature are derived “ad hoc”. The boundary integral operator constructed is shown to be symmetric with respect to a time-convolutive bilinear form so that the boundary solution is characterized by a variational property and its approximation preserving symmetry can be achieved by a Galerkin boundary element procedure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050166
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  • 6
    Electronic Resource
    Electronic Resource
    On multiplicity of solutions in quasi-brittle fracture computations (1997)
    Springer
    Computational mechanics 19 (1997), S. 511-516 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The analysis of quasi-brittle fracture processes is formulated as a linear complementarity problem either in finite increments or in rates. Some time-stepping solution procedures and mathematical programming algorithms are discussed as for their ability to capture the whole set of possible alternative equilibrium paths. Potentialities and limitations of the proposed approach and of the relevant procedures are pointed out also by means of a numerical example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050201
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Symmetric Galerkin boundary element method in plasticity and gradient plasticity (1995)
    Springer
    Computational mechanics 17 (1995), S. 115-129 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  A boundary integral equation (BIE) formulation and a boundary element (BE) method which confer symmetry to key operators are concisely described with reference to quasi-static plasticity. This formulation is based on the combined use of static and kinematic sources, on Galerkin weighted residual enforcement of integral equations for displacements and tractions along the boundary and for stresses in the potentially yielding domain and on space discretizations in terms of generalized variables in Prager’s sense. Typical theoretical results of computational interest not available in conventional nonsymmetric BE methods are surveyed. The subjectivity (mesh-dependence) implied by material instability is illustrated by examples. As a remedy, a symmetric BIE-BE formulation for nonlocal, gradient-dependent plasticity is developed and discussed on the basis of its variationally consistent discretization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356484
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Chemisch-analytische Untersuchungen zur Frage der Veränderung des Kaffees durch das Kofrosta-Behandlungsverfahren (1965)
    Springer
    European food research and technology 128 (1965), S. 237-245 
    Details
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Zusammenfassung In Rohkaffee, unbehandeltem Röstkaffee, Kofrosta-behandeltem Röstkaffee, Kofrosta-Abfall und in Silberhäutchen der SortenKenya, Columbia undSantos sowie einer Mischung ausColumbia undSantos wurden Wassergehalt, Asche, Aschenalkalität, Kalium- und Natriumgehalt, wasserlöslicher Anteil der Asche, Extraktgehalt, Gerbstoffgehalt, Säuregrad, Rohfettgehalt, Säure-, Verseifungs-, Jodzahl sowie unverseifbarer Anteil des Fettes, Chlorogensäure-, Coffein- und Trigonellingehalt, Gesamtstickstoff sowie die Gehalte an Pentosanen, Mercaptanen und flüchtigen Phenolen ermittelt. Außerdem wurden noch Titrationskurven aufgestellt und gaschromatographische Untersuchungen sowie Milchgerinnungs- und Verdauungsversuche durchgeführt. Ein gesicherter, außerhalb der Fehlergrenze der verwendeten Methoden liegender Unterschied zwischen unbehandelten und behandlten Kaffee konnte nicht gefunden werden. Lediglich der Pentosangehalt scheint im behandelten Kaffee etwas niedriger zu sein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01138960
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  • 9
    Electronic Resource
    Electronic Resource
    Beitrag zum Nachweis und zur Bestimmung von Pesticiden in pflanzlichen Lebensmitteln (1969)
    Springer
    European food research and technology 139 (1969), S. 67-76 
    Details
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Zusammenfassung Die Bestimmung von halogenhaltigen Pesticiden in verschiedenen Lebensmitteln wird beschrieben. An die Extraktion mit Acetonitril und das überführen in Petroläther schließt sich bei pigmentreichen Extrakten eine säulenchromatographische Vorreinigung an Aluminiumoxid an. Restliche Pigmente werden bei der dünnschicht-chromatographischen Trennung der Pesticide auf einer Schicht aus Magnesiumoxid, Aluminiumoxid und Borsäure mit abgetrennt. Die quantitative Bestimmung erfolgt durch Gaschromatographie mit Elektroneneinfangdetektor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01855298
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  • 10
    Electronic Resource
    Electronic Resource
    Beitrag zum Nachweis und zur Bestimmung von Pesticiden in pflanzlichen Lebensmitteln (1969)
    Springer
    European food research and technology 139 (1969), S. 294-301 
    Details
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Zusammenfawung Die dünnschichtchromatographische Trennung von 13 halogenhaltigen Pesticiden auf Kieselgel HF254 + 366 wurde geprüft. Durch eindimensionale Chromatographie mit Petroläther, n-Hexan, Cyclohexan, Tetrachlorkohlenstoff, n-Heptan oder Trichlorathylen können die Pesticide in zwei Gruppen getrennt werden. Gruppe 1: Pentachlornitrobenzol, Aldrin, Heptachlor, Tetrasul, p,p′-DDT;Gruppe 2: Trichlordinitrobenzol, Trichlortrinitrobenzol, Dieldrin, Endrin, Lindan, Methoxychlor, Kelthane, Tbiodan (α +ß-Isomeres). Gruppe 1 kann durch zweidimensionale Chromatographie mit Petroläther als Fließmittel in beiden Dimensionen getrennt werden. Gruppe 2 kann durch zweidimensionale Chromatographie mit Trichloräthylen als Fließmittel in der ersten Dimension and Toluol als Fließmittel in der zweiten Dimension getrennt werden. Nicht getrennt werden Dieldrin and Endrin. Ihre Trennung gelingt ebenfalls durch zweidimensionale Chromatographie mit Trichloräthylen in erster and Petroläther/Äther = 95/5 in zweiter Dimension oder, indem mit Petroläther/Äther = 95/5 in beiden Dimensionen chromatographiert wird.[/p]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01365691
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