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  • 1
    Electronic Resource
    Electronic Resource
    Kinetics and mechanism of chlorine addition to acrylic acid and its derivatives with special reference to the nature of the transition state (1980)
    s.l. : American Chemical Society
    The @journal of organic chemistry 45 (1980), S. 1162-1164 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01294a051
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetics and mechanism of the reaction between phenyl isocyanate and alcohols in benzene medium (1984)
    s.l. : American Chemical Society
    The @journal of organic chemistry 49 (1984), S. 720-722 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00178a035
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  • 3
    Electronic Resource
    Electronic Resource
    Bifurcations, catastrophes and chaos in a pre-buckled beam
    Amsterdam : Elsevier
    International Journal of Non-Linear Mechanics 29 (1994), S. 449-462 
    Details
    ISSN: 0020-7462
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0020-7462(94)90014-0
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  • 4
    Electronic Resource
    Electronic Resource
    Enthalpy and entropy of the equilibrium Br"2 + Br^- Br"3^- in acetic acid-water mixtures
    Amsterdam : Elsevier
    Journal of Inorganic and Nuclear Chemistry 43 (1981), S. 619-620 
    Details
    ISSN: 0022-1902
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-1902(81)80521-0
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetics of the bromination of phenolic ethers in acetic acid - Partial rate factors for bromination and σ"p^+ constants for para alkoxy groups
    Amsterdam : Elsevier
    Tetrahedron 28 (1972), S. 3827-3831 
    Details
    ISSN: 0040-4020
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4020(01)93830-X
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  • 6
    Electronic Resource
    Electronic Resource
    On the substituent effects of halogens in aromatic substitutions (1979)
    Springer
    Monatshefte für Chemie 110 (1979), S. 647-655 
    Details
    ISSN: 1434-4475
    Keywords: Aromatic substitution ; Bromination, kinetics ; Kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Bromierung von 4-Bromphenol mit Br2 in Essigsäure wurde untersucht. Außerdem wurden dieArrhenius-Aktivierungs-Energien für die Bromierung von vierp-substituierten PhenolenRC6H4OH (R=CH3, F, Cl und Br) genau bestimmt. Die beobachteten Substituenten-Effekte werden diskutiert und interpretiert.
    Notes: Abstract The general kinetic features of the bromination of 4-bromophenol by molecular bromine in acetic acid medium has been studied andArrhenius activation energies for the bromination of fourpara substituted phenols of the general formulaRC6H4OH (R=CH3, F, Cl, and Br) have been accurately determined. These values, which indicate an anomalous order in substituent effect of halogens, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00938368
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  • 7
    Electronic Resource
    Electronic Resource
    Stability of stochastic Leipholz column with stochastic loading (1992)
    Springer
    Archive of applied mechanics 62 (1992), S. 363-375 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Behandelt wird der Leipholz-Stab, dessen Elastizitätsmodul, Masseverteilung und tangential folgende Streckenlast stochastisch sind. Die nicht selbstadjungierte Differentialgleichung und die Randbedingungen werden als solche mit Zufallskoeffizienten betrachtet und die übliche Störungsmethode benutzt. Im Regularitätsbereich werden die nicht selbstadjungierten Operatoren benutzt. Hergeleitet wird die vollständige Kovarianz-Struktur der Eigenwerte der freien Schwingung und kritischen Lasten als Funktionen der Eigenschaften zweiter Ordnung der zufälligen Eingangsgrößen, die die Schwankungen der Systemparameter charakterisieren. Der Mittelwert der kritischen Last wird aus dem gemittelten Problem berechnet und die zugehörige Eigenwert-Statistik wird gesucht. Über die Frequenzgleichung wird eine Transformation vorgenommen, um die Statistik des Lastparameters zu erhalten. Eine numerische Studie illustriert die Leistungsfähigkeit der hergeleiteten Ausdrücke.
    Notes: Summary The Leipholz column which is having the Young modulus and mass per unit length as stochastic processes and also the distributed tangential follower load behaving stochastically is considered. The non self-adjoint differential equation and boundary conditions are considered to have random field coefficients. The standard perturbation method is employed. The non self-adjoint operators are used within the regularity domain. Full covariance structure of the free vibration eigenvalues and critical loads is derived in terms of second order properties of input random fields characterizing the system parameter fluctuations. The mean value of critical load is calculated using the averaged problem and the corresponding eigenvalue statistics are sought. Through the frequency equation a transformation is done to yield load parameter statistics. A numerical study incorporating commonly observed correlation models is reported which illustrates the full potentials of the derived expressions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00804597
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  • 8
    Electronic Resource
    Electronic Resource
    Charge density—Activation energy correlations in electrophilic aromatic substitution reactions (1981)
    Springer
    Monatshefte für Chemie 112 (1981), S. 581-585 
    Details
    ISSN: 1434-4475
    Keywords: Activation energy ; Aromatic substitution ; Charge density ; Del Re method ; Hückel method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Für sechs aromatische Moleküle wurden mittelsHückelrechnung (MO-LCAO) und nach der Methode vonDel Re die Ladungsdichten errechnet und diese mit experimentellen Aktivierungsenergien korreliert.
    Notes: Abstract Charge-density calculations have been made on six aromatic molecules by making use ofHückel MOLCAO andDel Re methods and correlated with experimental activation energy values to test certain earlier interpretations given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899672
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  • 9
    Electronic Resource
    Electronic Resource
    Cresols—An investigation into their electronic structure and spectra (1982)
    Springer
    Monatshefte für Chemie 113 (1982), S. 949-963 
    Details
    ISSN: 1434-4475
    Keywords: Computation, CDNO/2 based-PPP-CI, Cresols
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Drei isomere Kresole wurden mittels CNDO/2- undPPP-CI-Methoden untersucht; die Ergebnisse wurden bei den folgenden Untersuchungen benutzt: (i) Vergleich der elektronischen Strukturen dieser Verbindungen in bezug auf die Stammverbindungen Phenol und Toluol, (ii) eine quantitative Aussage über ihre chemischen Reaktivitäten und die Absorptionsspektren. Mit Hilfe von CNDO/2 abgeleiteten σ-Ladungswerten, dem daraus ermittelten Valenz-Ionisations-Potential und Ein-Zentrum-zwei-Elektronen-Integralen wurden diePPP-CI-Berechnungen nach dem Schema vonNishimoto undForster ausgeführt. Die pseudo-ungesättigte Rolle der Methylgruppe wurde berücksichtigt. Im Gegensatz zurPPP-Näherung zeigte die auf CNDO/2 bezogenePPP-CI-Methode bei den Berechnungen der Spektren eine bessere Übereinstimmung mit den experimentellen Daten.
    Notes: Abstract The three isomeric cresols were subjected to the all-valence-electron CNDO/2 andPPP-CI calculations. Results from this study were used: (i) to compare the electronic structures of these isomers vis-à-vis parent compounds—phenol and toluene, (ii) to obtain a quantitative picture of their chemical reactivities and electronic absorption spectra. Using the σ-core charges derived from CNDO/2 calculations and subsequently revising the valence-state ionisation potential and one-center-two-electron repulsion integrals, thePPP-CI calculations were performed on the title compounds according toNishimoto andForster scheme. In these calculations the pseudo-unsaturated nature of the methyl group has been given due consideration. In spectral assignment, compared to the conventionalPPP approach, the CNDO/2-basedPPP-CI method gave a better agreement with the experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00799236
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  • 10
    Electronic Resource
    Electronic Resource
    Snapthrough instability of a stochastic a von Mises truss (1993)
    Springer
    Archive of applied mechanics 63 (1993), S. 253-260 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Ein von Mises Fachwerk mit stochastisch verteilten Materialeigenschaften wird bezüglich der Durchschlagsinstabilität untersucht. Die Spannbreite der Durchschlagslast wird analytisch als Funktion der Spannbreite der Materialeigenschaften berechnet, die stochastisch verteilt angenommen werden. Eine explizite Gesamtbeschreibung der Struktur ist bei Benutzung experimenteller Daten selten möglich. Deshalb werden Grenzen für die Durchschlagskraft entwickelt, die von der Kenntnis dieser Gesamtbeschreibung unabhängig sind. Zwei Grenzfälle werden betrachtet, um die Spannbreite der Materialeigenschaften darzustellen. Die Ergebnisse werden grafisch dargestellt.
    Notes: Summary A von Mises truss with stochastically varying material properties is investigated for snapthrough instability. The variability of the snap-through load is calculated analytically as a function of the material property variability represented as a stochastic process. The bounds are established which are independent of the knowledge of the complete description of correlation structure which is seldom possible using the experimental data. Two processes are considered to represent the material property variability and the results are presented graphically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00793892
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