Materials Literature
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Measurements of the specific heat of quasi one-dimensional conductors, ${(\mathrm{T}\mathrm{a}{\mathrm{Se}}_{4})}_{2}$I and ${(\mathrm{N}\mathrm{b}{\mathrm{Se}}_{4})}_{3}$I, between 0.1 and 8 K, are reported. Whereas no deviation from the ${T}^{3}$ law occurs at low temperature for ${(\mathrm{N}\mathrm{b}{\mathrm{Se}}…
Two Peierls instabilities with different critical temperatures and nearly equal wave vectors are considered in the limit of weak bilinear coupling. This coupling is important close to the first transition, when the unstable phonon induces the ordering at the same wave vector in the other phonon branch. The low-tempera…
Effects of lattice fluctuations on the charge-density-wave transition are studied for a three-dimensional system of the basis of a two-band model. Using the thermal Green function method the authors calculate the polarisation function for phonons and the self-energy for electrons in the mode-mode coupling approximatio…
An E.P.R. study of the luminescent state in the CaMoO4 crystal at 1·2 K with a 60–80 GHz spectrometer is reported. The spectra can be fitted with a spin hamiltonian for an orbitally nondegenerate triplet state with D = - 94·358 GHz and E = 32·697 GHz. The directions of the principal axes of the ZFS tensor indicate tha…
Sonicated calf thymus DNA with an average length of approximately 100 base pairs has been found to form a cholesteric liquid crystal at a concentration of approximately 250 mg of DNA/mL of solution. Immediately after preparation, small ordered domains of a few micrometers are formed, resulting in an opaque solution. T…
A theory of fracture in spatially varying anisotropic glass is developed to interpret electron micrographs of freeze-fractured surfaces of cholesteric samples. The expression for energy per unit area released by crack formation is $\ensuremath{\gamma}\ensuremath{\propto}{[\mathbf{n}\ifmmode\cdot\else\textperiodcentere…
We report here measurements of excitation-profile spectra for Raman scattering from the central-carbon breathing mode of crystal violet adsorbed on a smooth gold surface. For polarization configurations that involve the $xx(or yy)$ component of the Raman tensor, the spectra exhibit a resonance peak corresponding to th…
We propose a simple NMR technique, and the underlying theory, to evaluate, with high accuracy, four out of the five viscosity coefficients and the ratio $\frac{{k}_{33}}{{k}_{11}}$ of the bend to splay Frank elastic constants, in nematic polymers. Quantitative data on the viscosities ${\ensuremath{\gamma}}_{1}$, ${\en…
The supercooling and freezing of a restricted liquid has been studied by the probing of its molecular dynamics with picosecond optical techniques. A newly developed transparent porous host material makes it possible to study the liquid viscosity as a function of the confining pore radius and temperature. The observed…
bcc crystalline colloidal microsphere suspensions are shear melted into the metastable liquid phase. Recrystallization occurs via nucleation and growth of single crystallites at dilute sites. The nearly spherical growing crystals have rough interfaces with a time-independent interface velocity, $v$. The velocity is fo…
Transmission electron micrographs of individual mineralized collagen fibrils show that hydroxyapatite crystals are located mainly within the fibrils at the level of the gap regions. The plate-shaped crystals are observed to be more or less uniformly stacked across the fibril diameter. We therefore suggest that the cry…
Abstract Sulfenamide‐accelerated sulfur vulcanization of natural rubber/chlorobutyl rubber compounds has been investigated at temperatures from 155 to 175°C over 0.1 to 400 min. Continuous measurements in a Cone Rheometer were used to estimate the extent of crosslinking, which was plotted against cure time. On the bas…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text P. A. Greet, "Coating stress in Fabry-Perot etalons," Appl. Opt. 25, 3328-3330 (1986) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation ale…
KEYWORDS: chemical kineticscladdingoxidationsevere accidentSFDsteam starvationtemperature dependencetime dependencevery high temperatureZircaloy 4
We studied the effect of long-term (40 yr), intensive cultivation and irrigation on soil properties in the Jordan Valley, Israel, which had experienced declining crop yields. Three cultivated soil pedons and an equivalent undisturbed soil from the same site were analyzed for several soil properties. The major differen…
The vapor pressures over vanadium-oxygen solid solution (0.001≦O/V≦0.145) were measured by mass-spectrometric method in the temperature range of 1,855–2,117K. The main vapor species were observed to be V(g) and VO(g). The vapor pressure of V(g) is higher than that of VO(g) over the solid solutions with all O/V ratios…
Unexpected brittle failures of UNS N05500 drill string parts and nonmagnetic drill collars have recently been observed in cases where the UNS N05500 components were galvanically coupled to carbon steel in concentrated salt solutions at temperatures between ambient and higher than 373 K (100 C). Cracking occurred prefe…
Abstract PVC films and films containing the modifying copolymers, irradiated by increasing dose of UV‐radiation of λ = 253.7 nm were investigated. It was previously stated 1–3 that 1–10% content of modifying copolymers in PVC films distinctly change the resistance of PVC to UV‐radiation and this is the cause that phot…
The interaction of sodium polysulfides and candidate metals for the current collector and cell casing in sodium/sulfur cells at 300° and 350°C is explored using cyclic voltammetry. The metals investigated are chromium and molybdenum, and data for voltammetric sweeps at rates of 10–500 mV/s in are reported. The results…
Large components manufactured from Cr–Mo–Ni low-alloy steels are usually heavily tempered for the purpose of stress relieving, with resultant undesirable loss of strength and the inception of upper-nose temper embrittlement (UNTE). This paper describes an investigation on the effects of vanadium additions and of varia…