Now showing items 31-40 of 166
Effect of cyclic stress on enthalpy relaxation in polycarbonate
(John Wiley & Sons, Inc., 1992-03-15)
Possible effects of cyclic stress on physical aging in polycarbonate were investigated using differential scanning calorimetry (DSC) measurements. When the enthalpy overshoot by DSC of specimens of different previous ...
Vibrational analysis of peptides, polypeptides, and proteins. XXXII. Α-Poly( L -glutamic acid)
(Wiley Subscription Services, Inc., A Wiley Company, 1985-08)
The Raman and ir spectra of Α-helical poly( L -glutamic acid) have been assigned on the basis of a normal mode calculation for this structure. The force field was based on our previously refined main-chain force constants ...
Vibrational analysis of 2,3,4-trichloropentanes
(Elsevier, 1990)
One meso form and the racemic isomer of 2,3,4-trichloropentane have been synthesized, and their infrared and Raman spectra analysed on the basis of a general force field refined for multiply-chlorinated hydrocarbons. ...
Dephasing of optically induced excitonic coherences in semiconductor heterostructures
(Springer-Verlag, 2000-11)
Resonant optical excitation of a direct bandgap semiconductor below the band edge induces excitonic coherences. Experiments based on transient four-wave mixing or cw spectral-hole burning provide an excellent approach to ...
Treatment of redundancies among internal coordinates in optimizing molecular mechanics force constants
(John Wiley & Sons, Inc., 1992-11)
The use of redundant coordinate bases in the construction of molecular mechanics force fields is discussed. It is shown that the intrinsic indeterminacy in a force field in redundant coordinates in general stems from the ...
Raman and normal mode studies of the polypeptide chain conformations in crystalline magnesium and calcium poly(-glutamate)s
(Elsevier, 1985)
An analysis of the Raman spectra of dry crystalline magnesium and calcium poly(-glutamate)s, based on a normal mode calculation of [alpha]-helical poly(-glutamate), shows that the polypeptide chains in both salts have an ...
Infrared spectra of high polymers. VI. Polystyrene Presented in part at the American Physical Society, Philadelphia, Pennsylvania, March, 1957.
(Interscience Publishers, Inc.Wiley Periodiocals, Inc., 1958)
The infrared spectrum of polystyrene has been obtained in the region of 70 cm. −1 to 3200 cm. −1 . These data, plus Raman scattering data from the literature, are used to make a complete assignment of the normal modes of ...
Direct analysis of small-angle equatorial x-ray scattering from fibrous systems. II. Methods of extracting physical parameters describing the scattering system
(John Wiley & Sons, Inc., 1972-05)
Small-angle equatorial x-ray scattering from fibrous systems is often complicated by the effects of morphological organization and/or heterogeneities as well as by macromolecular structure and organization influencing this ...
Planarity of the carbon chain in crystalline polyethylene
(John Wiley & Sons, Inc., 1967-01)
No Abstract.