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  • Chemistry  (18)
  • Organic Chemistry  (9)
  • 25.70.Jj  (3)
  • 25.70.Gh  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Multifragmentation study on 30 AMeV32S+58Ni (1995)
    Springer
    The European physical journal 350 (1995), S. 327-341 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Gh ; 25.70.Jj ; 25.70.Pq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In a multidetector experiment on 26 or 30 AMeV32S+58Ni, up to four coincident heavier or intermediate-mass fragments were observed. One of these occasionally has the characteristics of a projectile-like fragment, up to three may be attributed to the decay of the heavy reaction product. Taking the velocity of the fragments as a measure of the heavy-product excitation energy, one finds evaporation, fission and multifragmentation to follow one another with rising excitation. Model simulations of sequential decay with up to two binary fissions and, alternatively, of simultaneous statistical multifragmentation were performed for comparison with experimental distributions of mass, velocity and (for events with three slow intermediate-mass fragments) relative azimuthal angle. Though in the three-fragment events indications of simultaneous multifragmentation are present, the sequential binary decay predominates. Evaporated protons and α particles detected in coincidence have a mean multiplicity growing with excitation energy, while the temperature governing the spectra has a plateau with a value of about 5.5 MeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291190
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamics and thermalization in violent collisions between40Ar and Ag at 27 MeV/nucleon (1991)
    Springer
    The European physical journal 340 (1991), S. 63-77 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Gh ; 25.70.Jj ; 25.70.Lm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For the violent collisions of 27 MeV/nucleon40Ar with Ag, coincidence measurements have been made between heavy residues and intermediate mass fragments (3≦Z≦14) or light charged particles. From the analysis of the correlation between heavy residues (mass and velocity) and intermediate mass fragments, the main characteristics of the dominant mechanisms, fusion and partially damped collisions preceded or accompanied by a preequilibrium emission, are presented. Balances concerning mean values of parallel linear momentum, mass and atomic number, are established and confirm that a complete description of violent collisions was obtained. Then thermalization is discussed, first in terms of excitation energies derived from kinematics between heavy residues and intermediate mass fragments, and secondly in terms of initial temperature estimates derived from light charged particle spectra. Very hot nuclei (T⋍5.7–6.6 MeV) are produced over a large impact parameter range from very central collisions to medium peripheral ones. Various experimental results are compared to predictions obtained with semi-classical calculations (Landau-Vlasov equation). From their good agreement one may conclude that, depending on the impact parameter, thermal equilibrium is achieved within 4–10×10−22 s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284482
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  • 3
    Electronic Resource
    Electronic Resource
    Fusion-fission of heavy systems (1988)
    Springer
    The European physical journal 330 (1988), S. 295-301 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Jj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of the entrance channel on fission processes was studied by forming the same composite system by two different target-projectile combinations (40Ar+209Bi and56Fe+187Re, respectively). Compound nucleus fission and quasi fission were observed and the analysis was performed in the framework of the extra-extra-push model, which provides a qualitative interpretation of the results; limits for the extra-extra-push threshold are given, but problems with quantitative predictions for the extra-push are noted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294873
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  • 4
    Electronic Resource
    Electronic Resource
    Über den Abbau von α-Amino-β-benzoyl-propionsäure im tierischen Organismus (1949)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 32 (1949), S. 2553-2556 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. α-Amino-β-benzoyl-propionsäure wird durch Rattenleberextrakt unter Abspaltung von Alanin zerlegt.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19490320745
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  • 5
    Electronic Resource
    Electronic Resource
    Über Metallcarbonyle. XXXVII. Über Rhenium-halogeno-pentacarbonyle, ihre Bildungstendenz und Eigenschaften (1941)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 248 (1941), S. 243-255 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Im Anschluß an die Auffindung der Halogenopentacarbonyle des Rheniums Re(CO)5Halg, über die früher berichtet wurde, wird das Bildungsbestreben dieser Verbindungen genauer untersucht. Es zeigt sich, daß sie bereits unter wesentlich milderen Bedingungen aus Rheniumhalogeniden entstehen, und zwar nimmt die Bildungstendenz in der Reihe Chlorid → Bromid → Jodid zu. Letzteres erhält man bereits im Kohlenoxydstrom bei gewöhnlichem Druck aus ReJ6K2, für Bromid und Chlorid, aus Komplexen oder normalen Rheniumhalogeniden, empfiehlt sich die Anwendung eines geringen Überdrucks von 10 bzw. 30 at Kohlenoxyd. Insgesamt ist für die Entstehung der Halogenopentacarbonyle weniger die Höhe des CO-Drucks als die Temperatur (200-230°) maßgebend.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19412480303
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  • 6
    Electronic Resource
    Electronic Resource
    Über Metallcarbonyle. XXXVIII. Über Rheniumpentacarbonyl (1941)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 248 (1941), S. 256-268 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nachdem die Bemühungen, durch Hochdrucksynthese aus metallischem Rhenium oder durch weitere Reaktionen der Halogenopentacarbonyle reines Rheniumcarbonyl zu erhalten, unter verschiedensten Bedingungen erfolglos blieben, wurde gefunden, daß oxydische Rheniumverbindungen, insbesondere Re2O7 oder auch ReO4K u. a. unter höherem CO-Druck und bei höherer Temperatur direkt halogenfreies, reines Rheniumcarbonyl liefern. Über den Reaktionsmechanismus der einfach zu formulierenden Umsetzungen werden verschiedene Vorstellungen entwickelt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19412480304
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  • 7
    Electronic Resource
    Electronic Resource
    Über Metallcarbonyle. XXXIX. Aminsubstituierte Rheniumcarbonyle (1941)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 248 (1941), S. 269-275 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Kohlenoxydverbindungen des Rheniums, die Halogenopentacarbonyle wie das reine dimere Pentacarbonyl, erweisen sich der CO-Substitution durch Pyridin oder o-Phenanthrolin zugänglich, wie dies schon früher bei den Metallen der Eisen- und Chromgruppe aufgedeckt wurde. Die aminsubstituierten Rheniumcarbonyle enthalten sämtlich noch wenigstens 3 Mol CO pro Rheniumatom, d.h.es werden stets nur 2Mol CO durch 2Mol Pyridin oder 1 Mol o-Phenanthrolin ersetzt: ReHal(CO)3Pyr2 nnd ReHal(CO)3 Phthrl sowie Re(CO)3Pyr2 und Re(CO)3, Phthrl2; letztere sind eventuell dimer wie das Rheniumpentacarbonyl. Die aminsubstituierten Rheniumcarbonyle erinnern bezüglich ihrer Entstehungsweise, ihres Baus und ihrer großen Beständigkeit durchaus an die aminsubstituierten Carbonyle der Chromgruppe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19412480305
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  • 8
    Electronic Resource
    Electronic Resource
    Optimierung von Filtergeweben auf Basis ermittelter Zusammenhänge zwischen textiltechnischen Parametern und Betriebsparametern der Filtration (1997)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 69 (1997), S. 1246-1247 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330690947
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Darstellung von α-Amino-γ-ketocarbonsäuren durch Kondensation von α-Ketonmonobromiden mit Natriumacetaminomalonester (1952)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 35 (1952), S. 407-411 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird eine Methode beschrieben, die es erlaubt, α-Ketomonobromide in Gegenwart von Natrium mit Acetaminomalonester zu kondensieren. Die Methode hat sich gut bewährt zur Darstellung von Phenacylacetaminomalonester, von Acetonylacetaminomalonester und, bei geringerer Ausbeute, von o-Nitrophenacylacetamino-malonester. Durch Verseifung und Decarboxylierung dieser Ester wurden die entsprechenden α-Amino-γ-ketocarbonsäuren in guten Ausbeuten gewonnen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19520350152
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  • 10
    Electronic Resource
    Electronic Resource
    7-Keto-3-oxy-ätio-cholen-(5)-säure und verwandte Verbindungen (1939)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 22 (1939), S. 1160-1170 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193902201147
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