Materials Literature
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The room-temperature ferromagnetic resonance (FMR) spectra of γ-Fe2O3, CrO2, and barium ferrite particulate magnetic recording tapes have been measured at microwave frequencies of 9.35 and 35 GHz for various orientations of the static and high-frequency magnetic fields with respect to the tape. For CrO2 tapes, the inf…
The phase behavior of ternary blends of an A–B random copolymer with two homopolymers (A and B) is investigated within the Flory–Huggins lattice theory. We restrict consideration to the formation of (isotropic) liquid phases. For compositionally symmetric systems in which the two homopolymers have equal molecular weig…
Dislocation mechanics based constitutive equation constants are determined for temperature, strain rate, work hardening, and polycrystal grain size influences on the deformation behavior of various tantalum materials. An analysis of the maximum load point strain provides a useful method of determining the work hardeni…
Photoelectron partial-yield and constant-initial-state (CIS) spectra of the layered-semiconductor GeS, GeSe, ${\mathrm{SnS}}_{0.9}$${\mathrm{Se}}_{0.1}$, and SnSe single crystals were investigated with use of synchrotron radiation. The cation d core (Ge 3d and Sn 4d) yield spectra show intense and sharp doublets due t…
We have investigated the dynamics of resonant third-order optical nonlinearity of chemically prepared poly(3-dodecylthiophene) by the degenerate four wave mixing technique using 60 fs pulses at 620 nm. The measured effective value of χ(3) is 5.5×10−11 esu, sixfold smaller than that obtained with 400 fs pulses, emphasi…
Experimental data on the isothermal decay associated with peak 4 of LiF:Mg,Cu,P are presented. The decay has been measured at various temperatures in the range 170-190 degrees C, presenting always the purely exponential variation of the light intensity with time typical of a first-order kinetics process. From the good…
The anisotropic thermal expansion of LiB 3 O 5 has been studied along the principal crystallographic directions over the temperature range of 17 to 790 degrees C by means of high-temperature X-ray powder diffraction. This orthorhombic crystal exhibits strongly anisotropic expansion with coefficients of 108.2*10 -6 K -…
delta 5-3-Ketosteroid isomerase (EC 5.3.3.1) catalyzes the isomerization of delta 5-3-ketosteroids to delta 4-3-ketosteroids by a conservative tautomeric transfer of the 4 beta-proton to the 6 beta-position using Tyr-14 as a general acid and Asp-38 as a general base [Kuliopulos, A., Mildvan, A. S., Shortle, D., & Tala…
Quartz is an insulator with an extremely wide band gap in the vacuum ultra-violet. However, under irradiation from high-energy electrons or X-rays, samples of high purity emit a luminescence band in the blue, corresponding to a Stokes shift of approximately 7 eV. This large Stokes shift has been ascribed to the self-t…
Mixtures of polyisoprene and poly(ethylene-propylene) have been studied using time-resolved elastic light scattering. For off-critical quenches just into the two-phase coexistence region, highly monodisperse spheres are observed, whose radii grow with a power law R(t)=${\mathit{R}}_{0}$${\mathit{t}}^{1/2}$. The monodi…
The temperature dependence of the luminescence from Eu 2+ activators in BaFBr:Eu 2+ photostimulated between 10 and 300 K in the optical absorptions of F centres produced by room temperature X-irradiation, revealed two thermally-activated processes. The photostimulated luminescence (PSL) increases sharply in intensity…
Optical-absorption and luminescence measurements on $^{13}\mathrm{C}$ and $^{12}\mathrm{C}$ diamonds establish that the indirect energy gap is 13.6\ifmmode\pm\else\textpm\fi{}0.2 meV higher for $^{13}\mathrm{C}$ than for $^{12}\mathrm{C}$ diamond. Zero-parameter calculations, allowing for the changes in electron-phono…
A glass exhibiting structural memory has been produced through the compression of a single crystal of AlPO(4) berlinite to 18 gigapascals at 300 kelvin. The unique and extraordinary characteristic of this glass is that upon decompression below 5 gigapascals it transforms back into a single crystal with the same orient…
Chemistry of α‐Aminonitriles. Aldomerisation of Glycolaldehyde Phosphate to rac ‐Hexose 2,4,6‐Triphosphates and (in Presence of Formaldehyde) rac ‐Pentose 2,4‐Diphosphates: rac ‐Allose 2,4,6‐Triphosphate and rac ‐Ribose 2,4‐Diphosphate Are the Main Reaction Products Glyclaldehyde phosphate aldomerizes in aqueous NaOH…
Diamond thin films have been grown epitaxially on high-pressure synthesized cubic boron nitride (c-BN) particles by using dc plasma chemical vapor deposition. At the early growth stage of the film on c-BN{111} surfaces, the island structure is observed and the number density of islands is about 1011 cm−2. The growth a…
Measurements of the optic index of refraction, along the c axis, are presented for three representative single crystals in the (PbxBa1−x) Nb2O6 ferroelectric system. In particular, we show that as the temperature is lowered, crystals at the morphotropic phase boundary (x=0.63±0.03) first develop a polarization along t…
Thin films of zirconia have been deposited using a reactive electron beam evaporation technique onto unheated alumina and fused silica substrates. The films were post annealed in the range 300–850 °C. The influence of post-deposition conditions on the optical properties like refractive index and absorption and nonopti…
Abstract A study on the graft copolymerization of methyl methacrylate onto defatted jute fibers by using potassium permanganate as initiator has been made. To determine the optimum conditions for grafting, the effects of permanganate, monomer, acid, alkali treatment, time, and temperature on percentage of grafting hav…
Abstract Polyamides were prepared by reacting 3,5‐diamino benzoic acid (DAB) and/or 1,3‐bis (3‐amino benzamido) benzene (ABB) with terephthaloyl chloride in N, N ‐dimethylacetamide. Five polymer samples having different contents of pendant carboxyl groups were prepared by changing the molar ratios of DAB: ABB in the i…
Abstract Determining the thermal history of a semicrystalline polymer is an area of extreme importance when it comes to understanding the structure‐propety relationships. For nylon 6 film and fiber products, we have shown that techniques such as differential scanning calorimetry (DSC), thermomechanical analysis (TMA),…