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  • Articles  (39)
  • Physics  (39)
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  • Articles  (39)
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  • 1
    Electronic Resource
    Electronic Resource
    Broad vibrational overtone linewidths in the 7νOH band of rotationally selected NH2OH (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 9194-9196 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Infrared–optical double-resonance spectroscopy of the 7νOH vibrational overtone level of NH2OH reveals 14 cm−1 wide spectral features. The product state distribution of the OH fragment subsequent to overtone excitation indicates that the 7νOH level of NH2OH is ∼128 cm−1 above the N–O bond dissociation energy. Comparison to HOOH overtone spectra at a similar excess energy suggests that the broad NH2OH linewidths result from vibrational state mixing at the 7νOH level and not from inhomogeneous structure or lifetime broadening of the dissociating molecules. The observation of 14 cm−1 overtone linewidths for a molecule the size of NH2OH suggests that the broad vibrational overtone transition linewidths in larger polyatomics may contain a substantial homogeneous component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459210
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  • 2
    Electronic Resource
    Electronic Resource
    Vibrational overtone spectroscopy of the 4νOH+νOH' combination level of HOOH via sequential local mode–local mode excitation (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 5659-5667 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Sequential pumping of the local OH stretch vibrations in hydrogen peroxide using infrared-optical double resonance permits spectroscopic access to the 4νOH+νOH' combination level. Analysis of the rotationally resolved vibrational overtone spectra generated by this technique determines approximate rotational constants for this level and a value of 17 051.8±3.4 cm−1 for the O–O bond dissociation energy. The linewidths of individual zeroth-order rotational transitions increase sharply with increasing K and change from smooth Lorentzian profiles to clumps of individual lines. The K dependence of the clump widths suggests that an a-axis Coriolis interaction is the primary coupling mechanism between the zeroth-order bright state and dark bath states. As a function of increasing J, each clump coalesces into a smooth Lorentzian profile. We interpret this J dependence in terms of a model that includes rotationally induced vibrational coupling among zeroth-order dark states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462665
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared spectrum of t-butyl hydroperoxide excited to the 4νOH vibrational overtone level (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 1461-1465 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The infrared predissociation spectrum of t-butyl hydroperoxide excited to the 4νOH level reveals extensive mixing between the zeroth-order OH stretch state and nearly isoenergetic zeroth-order dark states. Because most of these dark states have an OH stretch quantum number of zero, the predissociation spectrum strongly resembles the infrared spectrum of an unexcited molecule. The observed intensity distribution in the predissociation spectrum is what one would expect if the eigenstates prepared by 4νOH vibrational overtone excitation were statistical mixtures of all the nearly isoenergetic zeroth-order states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461060
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  • 4
    Electronic Resource
    Electronic Resource
    Possible Land Plants from the Middle Cambrian, Queensland (1972)
    [s.l.] : Nature Publishing Group
    Nature 238 (1972), S. 266-266 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The sample from which the acid insoluble residues were recovered comes from a locality about 1.5 miles north of Mt Murray, at about 21 49' S, 139 59' E. They were found in lime-phosphate rocks, of the Beetle Creek Formation1, consisting of sand-sized phosphatic and carbonate allochems in carbonate ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/238266a0
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  • 5
    Electronic Resource
    Electronic Resource
    Inhibition of natural killer cells by a cytomegalovirus MHC class I homologue in vivo (1997)
    [s.l.] : Nature Publishing Group
    Nature 386 (1997), S. 510-514 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The sequence of the MCMV MHC class I homologue (designated m!44) is remarkably similar to that of MHC class I proteins (Fig. 1). It is predicted to encode a 383 amino-acid type 1 membrane glycoprotein that bears sequence homology with the al, a2 and a3 domains of MHC class I heavy chains7'8. The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/386510a0
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  • 6
    Electronic Resource
    Electronic Resource
    Doves in false garb (1982)
    [s.l.] : Nature Publishing Group
    Nature 296 (1982), S. 386-386 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - The leading article on the meeting of professional groups concerned with supporting nuclear disarmament makes a number of astonishing assertions (Nature 18 February, p.542). For instance it seems to question the right of the medical profession to express an opinion on the issue, claiming that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/296386c0
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  • 7
    Electronic Resource
    Electronic Resource
    A note on estimating the direct and diffuse components of global radiation (1972)
    Springer
    Theoretical and applied climatology 20 (1972), S. 191-205 
    Details
    ISSN: 1434-4483
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Es werden empirische Methoden der Schätzung der direkten und der diffusen Komponenten einer bekannten Globalstrahlung ausführlich geprüft und mit Beobachtungsdaten aus Australien, Papua, Neu Guinea, Indien, Südafrika und Stanley-Inseln verglichen. Daraus ergeben sich signifikante Unterschiede zwischen den in dieser Untersuchung abgeleiteten Beziehungen und den von Liu und Jordan aus Beobachtungen in der gemäßigten Zone der nördlichen Hemisphäre abgeleiteten Relationen. Es wurde ein einfaches Modell für die atmosphärische Schwächung entwickelt, das eine gute Grundlage für zwei empirische Schätzungsmethoden liefert. In diesem Modell wird die diffuse Strahlung auf die Schwächung des direkten Strahles in der Atmosphäre durch einen VorwärtsstreuungsfunktionskoeffizientenK bezogen, dessen Wert für verschiedene Regionen, Klimate und maßgebende Wolkenkategorien diskutiert wird. Schließlich werden theoretische Kurven für die Beziehung der diffusen und der direkten Strahlung zur gesamten Globalstrahlung für einige Werte des KoeffizientenK angegeben.
    Notes: Summary Empirical methods for estimating the direct and diffuse components of known global radiation are examined in detail and are tested with data from Australia, Papua New Guinea, India, southern Africa and the Stanley Islands. Significant differences are observed between relations deduced in this study and those reported by Liu and Jordan as deduced from temperate zone data in the northern hemisphere. A simple model for atmospheric attenuation has been developed which produces a common basis for the two empirical estimation methods. In this model diffuse radiation is related to the depletion of the direct beam in the atmosphere by a forward scattering function coefficient (K), whose value for different regions, climates and important cloud categories is discussed. Theoretical curves are generated relating diffuse and direct radiation to total global radiation for several values of the coefficientK.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02243175
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  • 8
    Electronic Resource
    Electronic Resource
    In situ thermoset molecular composites (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 2555-2565 
    Details
    ISSN: 0887-6266
    Keywords: in situ molecular composites ; molecular composites ; rigid rod polymer ; molecular modeling ; poly (azomethine) ; epoxy ; glass/epoxy composite ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The polymerization of rigid rod polymer precursors in a reactive matrix precursor, which is later cured in the mold, constitutes the in situ process. A poly-azomethine (PAM) was used as the rigid rod molecule. The resin used was an epoxy. We discuss the prediction of mechanical properties using micromechanics equations for chopped fiber composites. The chemistry used to synthesize the rigid rod polymer PAM in the epoxy precursor is reviewed. Approaches to better control the cure of these epoxy systems through cure kinetics and cure rheology studies completes the thermoset in situ molecular composite process. There was a 71% increase in tensile modulus in comparison to that of the neat epoxy resin. Molecular modeling simulations and continuum mechanics are used to help understand these findings. PAM/epoxy systems were used as a matrix material in the fabrication of unidirectional glass fiber/(PAM/epoxy) structural composites. © 1994 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090321601
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  • 9
    Electronic Resource
    Electronic Resource
    A new attempt to reconcile the statistical and phenomenological theories of rubber elasticity (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 35 (1997), S. 1919-1931 
    Details
    ISSN: 0887-6266
    Keywords: rubber elasticity ; kinetic theory ; statistical theory ; phenomenological theory ; stress-strain behavior of rubber ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The statistical and phenomenological theories of rubber elasticity are reviewed briefly. Combining recent concepts proposed by Yeoh and Gent, a new theory is proposed. The proposed constitutive model for rubber vulcanizates invokes two mechanisms; one influences behavior at small strains while the other dominates behavior at large strains. Network flaws, such as entanglements, are suspected to be responsible for the first mechanism. Finite extensibility of network chains is identified as the cause of the second. Thus, macroscopic behavior is directly linked to molecular concepts. The proposed theory allows prediction of the stress-strain behavior of a family of four rubber vulcanizates in different modes of deformation (simple extension, compression, and simple shear) from regression analysis of tensile data alone from just one member. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 1919-1931, 1997
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of the second virial coefficient in dilute polymer solutions from light scattering data (1956)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 19 (1956), S. 495-502 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Various methods are discussed of utilizing light scattering data obtained at only one angle (other than measurements to determine the intrinsic dissymmetry), in order to obtain values for the second virial coefficient. Illustrative data from light scattering measurements at two wave lengths using a sample of sodium polyglutamate from Bacillus anthracis are presented.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1956.120199311
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