Materials Literature
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A process leading to titanate‐based crystalline ceramic waste forms for commercial high‐level nuclear waste is described. Precursor materials referred to as hydrous calcium titanates are prepared by sol‐gel‐related techniques. Radionuclides are retained on the precursors by ion‐exchange/sorption reactions and the mate…
Abstract The linear thermal expansion coefficients α of three isotropic samples (crystallinity v = 0.42‐0.8) and one oriented sample (v = 0.8, draw ratio 11) of polyethylene have been measured between 2 and 100 K. Together with our previous measurements at high temperatures, these data provide general patterns for the…
Abstract not Available.
A program for the interactive selection of potential starting materials given a desired target molecule is described. The program uses hierarchical search to rapidly select candidates from a large starting material library and contains a function to evaluate the appropriateness of the functionality of the starting mat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigher valent manganese chemistry. Synthetic, structural, and solution studies on [Mn(catecholate)3]n- (n = 2, 3) complexesJudithAnn R. Hartman, Bruce M. Foxman, and Stephen R. CooperCite this: Inorg. Chem. 1984, 23, 10, 1381–1387Publication Date (Print):May 1, 1984Publicati…
The absolute magnetic susceptibility of cylindrical specimens is obtained with an ac susceptometer whose calibration is based on a calculation of mutual inductance. An axially magnetized cylinder is modeled as a solenoid of the same size. The mutual inductance between such a solenoid and a pickup coil of arbitrary dim…
The versatility of electron-energy-loss spectroscopy for investigating the electronic as well as the structural properties of a bulk sample is shown. The technique should be considered a powerful tool for ranging from low to high energies in the same experimental apparatus. The electronic properties of palladium are i…
Abstract The compatibility of polymer blends of poly(ϵ‐caprolactone) (PCL) and poly(styrene‐co‐acrylonitrile) (SAN) containing various acrylonitrile (AN) contents was studied to evaluate the influences of copolymer composition and PCL concentration upon blend compatibility. Blend compatibility was characterized by the…
Diamondlike carbon films have been prepared by ionized deposition from methane gas. The film structures were examined by transmission electron microscopy, electron diffraction, and electron spectroscopy for chemical analysis techniques. It was found that the structure of the carbon films could be classified into three…
Treatment of caput or cauda epididymal rat sperm with a low concentration (0.05%) of the cationic detergent cetyltrimethylammonium bromide and 30 mM 2-mercaptoethanol solubilized most of the sperm structures except for the sperm head and the outer dense fiber-connecting piece complex. The latter were purified, and abo…
A method by which sinusoidal pulsewidth modulation can be implemented on the delta inverter is described. Analysis of the resulting waveforms, in terms of the exponential form of the Fourier series, is provided, along with a comparison of harmonic content with a conventional sinusoidally modulated waveform. Experiment…
Electron-spin resonance has been used to measure the decay of the concentration of polymerization radicals in polymethyl methacrylate (PMMA) bone cement and the kinetics of the decay determined. Thermal annealing at various temperatures has shown that the logarithm of the concentration of radicals varies linearly with…
An investigation of the elastic and viscoelastic properties of Nova Scotia coal was carried out over a wide range of strain rates (quasi-static to impact). High resolution stress–strain diagrams for the coal were obtained from compression tests for the lower and medium strain rates up to [Formula: see text] and with t…
The principal features of the liquid-crystal molecular orientation within the variable-grating-mode liquid-crystal device have been determined as a function of the applied voltage across the cell by measurement of the polarization properties of light diffracted by the liquid-crystal birefringent phase grating.
Abstract Zwei Prüfmethoden zur Ermittlung des Verhaltens von thermoplastischen Kunststoffen bei der Einwirkung von Chemikalien werden gegenübergestellt. Dies sind der Immersionsversuch und der Zeit‐stand‐Innendruckversuch an Rohrproben mit Mediumfüllung. Beim Immersionsversuch wird die Veränderung der mechanischen Eig…
Abstract Melt‐spun nylon 66 fibers were drawn and subsequently heat treated isothermally and quenched. The heat‐treated fibers were then examined by wide‐and small‐angle x‐ray scattering (WAXS and SAXS), by differential scanning calorimetry (DSC), and by static mechanical testing. These measurements allow one to follo…
Abstract The study of the crosslinking reactions of halobutyl rubbers with zinc oxide, conducted on low molecular weight model compounds, has brought about a thorough understanding of the chemistry of this process. It has been shown that there are two competitive processes taking place, with the major one generating t…
A theoretical expression for the initial shear modulus of a plain-woven fabric is derived and is then compared with the moduli of a range of woven fabrics.
The space group of each low temperature phase in {N(CH 3 ) 4 } 2 ZnBr B and {N(CH 3 ) 4 } 2 CoBr 4 was determined by X-ray diffraction as P 12 1 / c 1. The characteristic diffuse streaks along the b * - and c * -directions were observed in the high temperature phase in both materials.
The development of new experimental methods and test equipment has permitted a study of the mechanical characteristics of unembalmed human cadaver skin. Excised tissue specimens were exposed to dynamic, biaxially applied displacements and forces in order to quantify the skin's anisotropic, viscoelastic stress-strain r…