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  • 1985-1989  (10)
  • 1980-1984  (20)
  • 1950-1954  (11)
  • 1935-1939  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    An efficient algorithm for solving a special class of LP's (1986)
    Springer
    Computing 37 (1986), S. 219-226 
    Details
    ISSN: 1436-5057
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir betrachten Lineare Programme der Form {maxcx|1≤Ax≤b,L≤x≤U} mit nichtnegativen Vektorenl,b,L,U und einer 0–1 MatrixA, die von “Manhattan Skyline” Form ist, d. h. der Träger jeder Zeile vonA ist im Träger jeder folgenden Zeile enthalten. Wir stellen einenO(nm+nlogn)-Algorithmus zur Lösung solcher Probleme vor und untersuchen seinen Anwendungsbereich.
    Notes: Abstract We consider LP's of the form max {cx|l≤Ax≤b, L≤x≤U} where,l,b,L,U are nonnegative andA is a 0–1 matrix which looks like “Manhattan Skyline”, i.e. the support of each row is contained in the support of every subsequent row. AnO(nm+nlogn) algorithm is presented for solving the problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02252513
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  • 2
    Electronic Resource
    Electronic Resource
    Superconductivity of thin films of lead, indium, and tin prepared in the presence of oxygen (1981)
    Springer
    Applied physics 25 (1981), S. 95-103 
    Details
    ISSN: 1432-0630
    Keywords: 74.70.Dg ; 74.60.-w ; 73.60.Ka
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We have studied the influence of oxygen on the superconducting properties of thin films of lead, indium and tin deposited on glass or sapphire substrates. In addition, the morphological microstructure was investigated by scanning electron microscopy. The film thickness was 1.0 μm, and the partial pressure of O2 during the film deposition was raised up to 1×10−4 Torr. In all three materials the development of a granular structure and a strong increase in the residual electric resistivity was observed due to the O2-treatment. Whereas in the Pb films no change of the critical temperature was found, the In films deposited on glass substrates showed a slight increase ofT c due to the oxygen. The strongest increase ofT c (up to 8%) was observed in the O2-treated Sn films. These results are discussed in terms of the McMillan theory. From our measurements of the critical current densityj c we conclude that edge pinning is dominant in the undoped films. All three materials showed a strong increase ofj c due to the O2-treatment which must be interpreted in terms of bulk pinning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901279
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  • 3
    Electronic Resource
    Electronic Resource
    Skineffekt im ebenen Keilraum (1981)
    Springer
    Electrical engineering 63 (1981), S. 247-252 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents Using numerical methods, the eddy current distribution is calculated in a conducting wedge induced by two exciting wires located symmetrical to the wedge. The complex equationsystem is solved by the relaxation-method of Gauß-Southwell and the solution is verified for the case of a conductiong semispace.
    Notes: Übersicht Für den Fall der symmetrisch zu einem leitenden Keil angeordneten, gegensinnig von sinusförmigem Wechselstrom durchflossenen Doppelleitung, wird mit Hilfe numerischer Methoden die Wirbelstromverteilung im Keil berechnet. Das entstehende komplexe Gleichungssystem wird nach dem Relaxationsverfahren von Gauß-Southwell gelöst und die Ergebnisse für den leitenden Halbraum kontrolliert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01574881
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  • 4
    Electronic Resource
    Electronic Resource
    Besprechungen (1954)
    Springer
    Naturwissenschaften 41 (1954), S. 239-244 
    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/BF00635139
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  • 5
    Electronic Resource
    Electronic Resource
    Besprechungen (1954)
    Springer
    Naturwissenschaften 41 (1954), S. 311-316 
    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/BF00638561
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  • 6
    Electronic Resource
    Electronic Resource
    Matroid matching in pseudomodular lattices (1989)
    Springer
    Combinatorica 9 (1989), S. 145-152 
    Details
    ISSN: 1439-6912
    Keywords: 05 B 35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The matroid matching problem (also known as matroid parity problem) has been intensively studied by several authors. Starting from very special problems, in particular the matching problem and the matroid intersection problem, good characterizations have been obtained for more and more general classes of matroids. The two most recent ones are the class of representable matroids and, later on, the class of algebraic matroids (cf. [4] and [2]). We present a further step of generalization, showing that a good characterization can also be obtained for the class of socalled pseudomodular matroids, introduced by Björner and Lovász (cf. [1]). A small counterexample is included to show that pseudomodularity still does not cover all matroids that behave well with respect to matroid matching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02124676
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  • 7
    Electronic Resource
    Electronic Resource
    Die polymerisation von N-ethylaziridin, seine copolymerisation mit N-(2-hydroxyethyl)aziridin und die überführung der copolymeren in die N-(2-chlorethyl)-analogaHerrn Prof. Dr. O. Kratky mit den besten Wünschen zum 80. Geburstag gewidmet (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 1413-1426 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: N-Ethylaziridine (1) was polymerized in water with HCl as initiator and copolymerized with N-(2-hydroxyethyl)aziridine (2). Rapid propagation and termination reactions were observed. The maximum yield increases with the initiator concentration, whereas the molecular weight decreases. This is due to the difference in basicity between the tertiary N-atoms of the two monomers and the tertiary and the terminal secondary N-atoms of the polymers, which causes tranfer and termination reactions. Macrocycles with a side chain on a quaternary N-atom are formed. During the copolymerization, the more basic 1 is preferentially incorporated into the copolymer chain. The copolymerization parameters can be estimated roughly on the basis of basicity considerations: r1 〉 1; r2 〈 1. The ratio of the rate constants (propagation to termination) is lower for 1 than for 2. This is due to the fact that the basicity difference between the monomer and the tertiary N-atoms of the polymer is higher for 1 than for 2. By reaction of thionyl chloride with the copolymers the desired hydrochlorides of the N-(2-chloroethyl) derivatives are obtained. The neutralisation with alkali did not result the free bases, since the products formed are rather due to side reactions.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830606
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Entwicklung der makromolekularen Chemie. H. Staudinger zum 70. Geburtstag (1951)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 63 (1951), S. 229-231 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: H. Staudinger, geboren am 23. März 1881 in Worms/Rh. feierte vor kurzem seinen 70. Geburtstag. Er habilitierte sich 1907 in Straßburg bei Thiele und wurde im gleichen Jahr a. o. Professor für organische Chemie an der Technischen Hochschule in Karlsruhe. 1912-1926 war er ordentlicher Professor für Chemie an der Eidgenössischen Technischen Hochschule in Zürich und ab 1926 in gleicher Eigenschaft an der Universität Freiburg/Br. H. Staudinger befaßte sich zuerst mit verschiedenen Stoffklassen und Problemen der organischen Chemie, insbesondere mit den von ihm entdeckten Ketenen. Seine Lebensarbeit widmete er aber der Chemie der Makromolekeln, die er vor mehr als 30 Jahren begründete und als deren markantester Vertreter er gilt. Etwa 500 Publikationen, davon allein etwa 100 über Cellulose, 60 über Kautschuk und Isopren, sind ein beredetes Zeugnis seiner unermüdlichen Schaffenskraft. Zahlreiche Ehrungen wurden ihm zuteil, von denen neben der Mitgliedschaft in vielen in- und ausländischen wissenschaftlichen Gesellschaften die Verleihung der Emil Fischer-Gedenkmünze des Vereins Deutscher Chemiker, der Leblanc-Gedenkmünze der französischen chemischen Gesellschaft, der Kautschukplakette, des Cannizzaro-Preises, der goldenen Ehrennadel des Vereins finnischer Chemiker und der Mitscherlich-Medaille genannt seien. H. Staudinger ist Ehrendoktor der Technischen Hochschule Karlsruhe und der Universität Mainz. Er gibt die von ihm begründete Zeitschrift „Die makromolekulare Chemie“ heraus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19510631002
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  • 9
    Electronic Resource
    Electronic Resource
    Untersuchungen an wäßrigen Lösungen hochmolekularer Säuren und ihrer SalzeVorgetragen in der Fachgruppe Chemie der Kunststoffe auf der 51. Hauptversammlung des VDCh in Bayreuth am 10. Juni 1938. I. (1938)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 51 (1938), S. 566-569 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19380513403
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  • 10
    Electronic Resource
    Electronic Resource
    Versuche zur fraktionierung von proteingemischen mit polyacrylsäurenAuszugsweise vorgetragen auf dem Eiweiß-Symposium Mainz 1951. (1953)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 10 (1953), S. 136-146 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Proteins are precipitated quantitatively from aqueous acidic solutions by polyacrylic acids (P 200-400). The highpolymer substance can be removed after dissolving the symplexes at neutral PH as an insoluble Ba- or protamine-salt, whereupon the proteins are recovered in an undenatured state. The interactions of bovine serum albumin or globulin with the polylectrolyte were studied as a function of PH and polymer/protein ratio. Mixtures of both proteins and of the whole human serum proteins can be separated at PH 4,6 by gradually adding a solution of the polymer. After centrifuging, the fractions were examined by electrophoresis on filter paper. Kidney peptidase seems to be stable under the conditions of precipitation.
    Notes: Proteine lassen sich quantitativ aus wäßriger saurer Lösung durch Polyacrylsäuren (P 200-400) ausfällen. Die Symplexe lösen sich bei neutralem PH; nach Entfernung der hochpolymeren Säure als schwerlösliches Ba- oder Protaminsalz werden die Proteine undenaturiert zurückerhalten. Untersucht wurde die Abhängigkeit der ausgefällten Protein-menge vom PH und von der zugesetzten Menge an PAcs bei reinem Serum-Albumin und Globulin (Rind), sowie an Gemischen aus beiden und an Humanserum. Unter Verwendung der Papierelektrophorese konnte die bei allmählicher Zugabe des Fällungsmittels bei PH 4, 6 eintretende Fraktionierung verfolgt werden, bei der zuerst Albumin, dann die Globuline zur Abscheidung gelangen. Vorversuche mit Nierenpeptidase zeigen, daß auch hier bei der Ausfällung kein nennenswerter Aktivitätsverlust eintritt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1953.020100111
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