Materials Literature
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The fluctuation-dissipation relation (FDR) is measured on the dielectric properties of a polymer glass (polycarbonate) in the range 20 mHz–100 Hz. It is found that after a quench below the glass transition temperature, the fluctuation-dissipation theorem is strongly violated. The amplitude and the persistence time of…
The effect of pressure on melt viscosity was investigated in the system NaAlSi 3 O 8 -CaMgSi 2 O 6 (Ab-Di) at pressures from 0.1 to 400 MPa using a parallel plate viscometer. The new measurements in the high viscosity range of 10 8.5 -10 11 Pa·s are consistent with previous data obtained at higher temperature (lower v…
Although genetic and biochemical studies suggest a role for Eps15 homology domain containing proteins in clathrin-mediated endocytosis, the specific functions of these proteins have been elusive. Eps15 is found at the growing edges of clathrin-coated pits, leading to the hypothesis that it participates in the formatio…
A four-parameter approximating formula, R=A e a x b f(x), accurately represents the skyshine line beam response function (LBRF) as a function of the distance (x) of the source-to-detector separation. Here, A is a constant for a given source energy and f(x)=e cx x dx is a damping factor. The four parameters are obtaine…
Abstract Blends covering the entire range of compositions of a metallocenic ethylene‐1‐octene, CEO, copolymer and two conventional isotactic polypropylenes, iPP, of different molecular weights have been prepared, analyzing the effect of composition and molecular weight on the crystallization (studied by DSC and X‐ray…
We have succeeded in preparing amorphous carbon disulphide (CS 2 ) by depositing its vapour on a cold substrate at 10 K. Complete formation of the amorphous state has been confirmed by neutron diffraction and differential thermal analysis (DTA). The amorphous sample crystallised at ca. 70 K, which is lower than the hy…
We have developed a method for measurement of internal stress in glass articles. The method uses Rayleigh‐scattered light from a properly polarized laser beam propagating through glass at an oblique angle. This light is imaged with an electronic focal plane array camera. The method is similar to earlier published meth…
The formation of crystals from solutions containing sodium carbonate and sodium sulfate is a complex process that often results in fouling of heat-transfer surfaces. Complexity results from a dependence of the composition of crystals formed on the composition of the solution, and the solution composition changes with…
The transmittance, absorbance, and reflectance of polypropylene (PP), polyethylene (PE), and polypropylene/polyethylene (PP/PE) blends prepared by a hot pressing method are investigated. IR and UV spectra of PP, PE, and PP/PE blends (0–80%) in the wavelength range of 200–25000 nm were examined. The optical absorption…
When sulfur vulcanized natural rubber compounds are exposed to a thermal ageing environment significant change in physical properties and performance characteristics are observed. These changes are directly related to modifications of the original crosslink structure. Decomposition reactions tend to predominate and th…
geology
Electron paramagnetic resonance (EPR) has been used to investigate point defects in single crystals of β-BaB2O4 (commonly referred to as BBO). An irradiation with x rays at 77 K produces two dominant EPR spectra, one electronlike and the other holelike. The trapped-electron center exhibits a 16-line hyperfine pattern…
Temperature studies of optical absorption spectra in the range of the fundamental absorption edge for layered CuInP2Se6 single crystals obtained by the technique combining recrystallization and vapor-phase transport, are reported. The temperature behavior of the absorption-edge spectra is the evidence for the es-senti…
The heat capacity of cyclooctanol was measured with an adiabatic calorimeter in the temperature range 5–340 K. Liquid cyclooctanol crystallized into crystal I, a plastic (orientationally disordered) phase. Crystal I was supercooled readily and underwent a glass transition at 160 K. Crystal II, obtained by annealing cr…
Relaxation processes occurring during electroinsertion into pure SnO 2 and electrochromic SnO 2 /Sb were interpreted on the basis of frequency-dependent response models. Within the framework of the classic theory of porous electrodes, the results indicated that, in the case of nanosized particle-based electrodes, the…
An extension of the concept of response reactions (RERs) is presented that allows the generation of thermochemical data from group additivity (GA) and ab initio methods using precisely the same stoichiometric and mathematical procedures. This goal is achieved by (i) reformulating the ordinary least squares (OLS) analy…
MgO-C-Al refractory is representative of the carbon-containing refractory. Al metal has been widely used as an antioxidant. However, since it has some defects, development of new antioxidant is desired due to adverse effects by reaction products. This paper describes a new family of antioxidants such as Al{sub 4}O{sub…
The relationship between the impulse breakdown voltage of vacuum gaps and electrode surface roughness was investigated for the purpose of controlling the surface roughness on HV conductors. The roughness of mechanically polished Cu and Cu-Cr electrodes was measured with a roughness meter, and the relationship between…
The prpB gene of Salmonella enterica serovar Typhimurium LT2 encodes a protein with 2-methylisocitrate (2-MIC) lyase activity, which cleaves 2-MIC into pyruvate and succinate during the conversion of propionate to pyruvate via the 2-methylcitric acid cycle. This paper reports the isolation and kinetic characterization…
A new form of time-resolved multiphoton-excited fluorescence imaging is described and used to study electric-field-induced reorientation dynamics in polymer-dispersed liquid crystal (LC) films. This method provides information on the static and dynamic LC orientation via polarization-dependent three-photon excitation…