The high frequency end of the relaxation spectrum for polymer molecules involves the rotation of the segmental bonds. This fast relaxation process, however, cannot take place easily in the condensed state crowded by the densely packed conformers, necessitating the slower cooperatively synchronous relaxation. As the temperature is lowered, the domain of cooperativity grows towards the infinite s...

The time and temperature dependencies of the line area (M0) and position (M1) of band III at approximately 760 nm have been measured with Fourier-transform infrared spectroscopy in deoxymyoglobin (Mb) and continuously photolyzed carbon monoxide myoglobin (MbCO). Below 200 K, the area of band III in the photoproduct Mb* increases with time even on time scales of hours. This behavior indicates ch...

Dielectric measurements were carried out on aqueous solution of poly(diallyldimethylammonium chloride) (PDADMAC) with different concentrations at room temperature. Additionally, for selected solutions the temperature dependence of dielectric relaxation spectroscopy (DRS) was examined in the range of 5-70 degrees C. The dielectric relaxation in the order of around MHz was observed, and the diele...

The purpose of this paper is to study the molecular mobility of paracetamol molecules in their amorphous state below the glass transition temperature (Tg) in order to evaluate the thermodynamic driving force which allows the amorphous form to recrystallize under different polymorphic modifications. Samples were aged at temperatures of -15, 0, 6, and 12 degrees C for periods of time from 1 h to ...

A = Jacobian matrix a = speed of sound, m∕s C = source term vector E = total energy, J∕kg e = internal energy vector, J∕kg F = inviscid flux tensor Fd = diffusive flux tensor Fo = Forchheimer number G = flux tensor, F − Fd − uU h = enthalpy, J∕kg h = species enthalpy vector, J∕kg hr = recovery enthalpy, J∕kg I = identity matrix J = directional species diffusion flux tensor, kg∕m K = permeabilit...

— The concept of local defect pressure is developed and is applied to determine the elastic relaxation about point defects in ionic solids. The method is superior to that of Kanzaki forces for treatment of Coulomb and many-atom interactions. The lattice sums for the Coulomb interaction and the relaxation volume of Schottky defects in NaCl and KC1 in the static limit are given; the use of neutra...

In order to clarify the molecular mechanism of the reorientation of adsorbed water in wood cell wall during dielectric relaxation process, the temperature and frequency spectrums of the dielectric relaxation process based on adsorbed water in wood, acetylated wood and formaldehyde-treated wood were measured, respectively, within a range of -60-20°C, 30Hz-3MHz and 0-27%m.c. On this basis, the qu...

Magnetic resonance is a wrell known tool for the investigation of atomic and molecular motions in solids and a large amount of work has been done in the past on this subject by studies of Zeeman (Ty/J spin-lattice relaxation time and dipolar line widths {To). More recently, the power of the NMR method has been still considerably improved bv the mea­ surements on rotating frame1,2 Tls and dipola...