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  • Chemistry  (33)
  • General Chemistry  (12)
  • 68 B 05  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Computing 31 (1983), S. 317-346 
    ISSN: 1436-5057
    Keywords: 68 B 05 ; 68 B 10 ; 68 F 05 ; 68 F 25 ; 90-04 ; Software development environments ; software specification ; syntax ; graph grammars
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Der folgende Aufsatz zeigt auf, daß programmierte sequentielle Graph-Grammatiken dazu benutzt werden können, die Veränderung hoher Zwischencodes zu spezifizieren, die im Kontext einer Software-Entwicklungsumgebung auftreten, deren Werkzeuge alle inkrementell und syntaxgesteuert arbeiten. Wir legen in diesem Aufsatz mehr Wert auf die Erläuterung einer systematischen Vorgehensweise, um die Spezifikation zu erhalten, als auf die detaillierte Abhandlung der Spezifikation selbst. Somit kann dieses Papier auch als ein Ansatz zu einem „Spezifikations-Engineering” mit Hilfe von Graph-Grammatiken angesehen werden. Der Ansatz wird maßgeblich beeinflußt von der Syntaxdefinition der zugrundeliegenden formalen Sprache für das Programmieren im Kleinen bzw. für das Modulkonzept etc. einerseits und andererseits von der Vorstellung der Form der Benutzerschnittstelle.
    Notes: Abstract The following paper demonstrates that programmed sequential graph grammars can be used in a systematic proceeding to specify the changes of high level intermediate data structures arising in a programming support environment, in which all tools work in an incremental and syntax-driven mode. In this paper we lay stress upon the way to get the specification rather than on the result of this process. Therefore, we give here some approach to “specification engineering” using graph grammars. This approach is influenced by the syntactical definition of the underlying language for Programming in the Small, the module concept etc. to be supported on one side but also by the idea of the user interface.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 130 (1923), S. 199-204 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 1 (1978), S. 71-72 
    ISSN: 0935-6304
    Keywords: Gas Chromatography ; Capillary, glass ; Separation of the four 10,12-Hexadecadiene-1-ol isomers ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Complete gas-liquid chromatographic separation of the four 10, 12-hexadecadiene-l-ol isomers using a FFAPcoated glass capillary column is described.These measurements are of importance for the analysis of pheromones from biological sources and for the control of material from stereospecific syntheses.
    Additional Material: 1 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 15 (1984), S. 386-393 
    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: Applicability of Different Etching Methods for Metals - Comparing Investigation of Metallographic Etching ProceduresThe feasibility of different etching techniques in laboratory practice is mainly appointed by the reproducibility of the metallographic micro-structure, which is dependent on the etching method, the etching time and a practical handling of the etching procedure. Comparing investigations concerning the applicability of chemical, electrolytic and ionic etching methods for metals and alloys in electrotechnical industry - with the aim to estimate efficiency and reproducibility of the micro-structure resulting from the different techniques - have been done. Micro-structure estimation will be done by different methods of light-microscopy.In any case physical ion-etching turns out to be the less problematic etching method - in comparison with chemical and electrolytic techniques. Ion etching shows a good reproducibility and allows the simultaneous etching of different materials. The summarizing valuation of the different etching methods includes a list of optimum etching parameters for copper, brass copper-tin and copper-beryllium alloys.
    Notes: Die Einsatzmöglichkeiten unterschiedlicher Ätzverfahren in der Laborpraxis werden im wesentlichen bestimmt durch die Reproduziorbarkeit der ausgebildeten Gefügestrukturen - als Funktion einer bestimmten Ätzmethode, der Ätzzeit und der problemlosen Handhabung der Ätzprozedur. Zur Anwendbarkeit des chemischen und elektrolytischen Ätzens, sowie des Ionenätzens bei Metallen und Legierungen der Elektrotechnik wurden vergleichende Untersuchungen mit dem Ziel durchgeführt, eine Beurteilung von Güte und Reproduzierbarkeit der nach den verschiedenen Ätzprozessen entstandenen Gefügebilder zu ermöglichen.Die Abbildung der Gefügestrukturen geschieht mit Hilfe unterschiedlicher lichtmikroskopischer Beobachtungsverfahren.Das physikalische Ionenätzen erweist sich gegenüber chemischen und elektrolytischen Ätzverfahren in allen Fällen als die problemlosere Ätzmethode, die neben einer guten Reproduzierbarkeit zudem ein gleichzeitiges Ätzen unterschiedlicher Materialien in einem Werkstoff ermöglicht.Eine zusammenfassende Wertung der verschiedenen Ätzverfahren umfaßt die Angabe optimaler Ätzparameter für die Werkstoffe Kupfer, Messing, CuSn 8 und Kupfer-Beryllium.
    Additional Material: 10 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 41-42 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; PCDD's ; PCDF's ; Adsorption phenomena ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 6
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of the dimethylphosphinic, dimethylthiophosphinic and dimethylphosphinous ester derivatives of several monohydroxy steroids are reported. The fragmentations of the derivatized steroids largely depend on the nature of the the phosphorus-containing ester group. Phenolic ester derivatives exhibit the base peak at the molecular ion, whereas the spectra of the secondary phosphinic esters are dominated by very intense protonated phosphinic acid ions [Me2 P(XH)(OH)]+ at m/e 95 (X = O) or at m/e 111 (X = S). The present results also indicate the low ionization potential for the phosphinic ester group. Due to their good gas chromatographic properties, these steroid derivatives appear to be particularly suitable for gas chromatographic mass spectrometric analysis of biochemical materials.
    Additional Material: 4 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 21 (1981), S. 474-482 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The effect of moisture on the curing reaction of Hercules 3501-6/AS graphite-epoxy prepreg was investigated. Test samples of prepreg were aged under humid conditions, while control samples were aged under identical temperature conditions but with negligible humidity. Determinations of the amounts of moisture absorbed and desorbed fom the samples were accomplished gravimetrically. Dielectric analysis was used to monitor the relative reaction rates and overall activation energies of the prepreg after various aging periods. Changes taking place in monomer concentrations were observed using high performance liquid chromatography (HPLC). As aging continued, samples aged under humid conditions displayed, significant decrease in the overall activation energy accompanied by increased reaction rates. This change did not occur in the control samples. Samples aged in high humidity showed increased conversion of monomers to polymer when compared to dry aged samples. The aging time required before the above changes became apparent was temperature dependent; the higher the aging temperature, the sooner the changes in reactivity occurred.
    Additional Material: 15 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 631-636 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid Crystalline 1,3,4-Thiadiazoles. II. 1,3,4-Thiadiazoles with CyclohexanefragmentsPreparation and liquid crystalline properties of disubstituted 1,3,4-thiadiazoles (1 and 2) are described. The mesomorphic behaviour of the title compounds is compared with their benzoate analogues. The dielectric anisotropy of these compounds is negative.
    Additional Material: 3 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 406 (1974), S. 101-104 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Transition Metal Diolefin Complexes. I. On the Electro-Synthesis of Iron Complex Compounds of Noncyclic 1,3-Di-olefinsThe cathodic reduction of iron trisacetylacetonate in presence of dienes and triphenylphosphine gives complexes of the typ (dien)2 FeP(C6H5)3. The synthesis of bis(1,3-butadiene)-triphenylphosphine iron and bis(isoprene)triphenylphosphine iron are described.
    Notes: Die kathodische Reduktion von Eisentrisacetylacetonat in Gegenwart von Dienen und Triphenylphosphin führt zu Komplexen des Typs (Dien)2FeP(C6H5)3. Die Darstellung von Bis-(1,3-butadien)-tri-phenylphosphineisen und Bis-(isopren)-tri-phenylphosphineisen wird beschrieben.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 406 (1974), S. 105-109 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Transition Metal Diolefin Complexes. II. Characterization of Phosphine-stabilized Iron Diolefin ComplexesBis(butadiene)triphenylphosphine iron and Bis(isoprene)triphenylphosphine iron are characterized by protolytic reactions, mass spectrometrical fragmentations and NMR-spectra. A structure for this compounds is proposed on the basis of the NMR spectra.
    Notes: Bis-(butadiene)triphenylphosphineisen und Bis-(isopren)-triphenylphosphineisen werden durch Protolysereaktionen, massenspektrometrische Fragmentierungen und NMR-Spektren charakterisiert. Auf der Grundlage der NMR-Spektren wird eine Struktur vorgeschlagen.
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