Materials Literature
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SYNOPSIS Transmission electron microscopy of suitably prepared specimens makes possible the direct observation of the multiphase morphology of block and graft copolymers, and polymer blends. Transmission specimens less than 1000 Å in thickness are made by ultramicrotome techniques. Several staining methods are now in…
A device capable of converting directly the kinetic energy of charged particles into electrical energy is considered. The device differs from earlier ones (such as Post's periodic focus electrostatic direct convertor) in that it makes use of the space charge repulsion in a high density charged particle beam. The beam…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Polymerization of α,α,α',α'-Tetrachloro-2-cyano-p-xylyleneShouji Iwatsuki and Kimio InoueCite this: Macromolecules 1977, 10, 1, 58–63Publication Date (Print):January 1, 1977Publication History Published online1 May 2002Published inissue 1 January 1977https://…
"Fundamental aspects of nuclear reactor fuel elements." International Metals Reviews, 22(1), pp. 258–259
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopolymer Chain Statistics. The Pseudo-Stereochemical Equilibrium Approach within the Continuum of Rotational States. The Unperturbed Dimensions of Atactic PolypropyleneG. Allegra and S. BrücknerCite this: Macromolecules 1977, 10, 1, 106–113Publication Date (Print):January 1…
The change of pH in corroding crevices has been investigated. Crevice specimens were immersed in NaCl solutions, and the pH and the Cl- ion concentration in crevices were determined. The potential inside the crevice was also measured with a capillary inserted into the crevice.The results show that the pH in crevice be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltrasonic velocity and allied parameters in alcoholic solutions of calcium nitrateSheo Prakash, N. Prasad, and O. PrakashCite this: J. Chem. Eng. Data 1977, 22, 1, 51–54Publication Date (Print):January 1, 1977Publication History Published online1 May 2002Published inissue 1…
Abstract The emission properties of 9-ethylphenanthrene (EPh), poly(9-vinylphenanthrene) (PVPh), poly(9-phenanthryl methacrylate) (PPhMA), and poly[2-(9-phenanthryl)ethyl vinyl ether] were investigated in solution. These vinyl polymers showed no clear excimer fluorescence in the longer-wavelength region. Both the fluo…
A simulation test of “A” segregation was made successfully by means of horizontal unidirectional solidification of 14kg ingot. “A” segregations reproduced by this method under several cooling conditions were investigated from the viewpoints of cooling and solidification rates.The results obtaind are as follows1) “A” s…
Nitrogen diffusion in polycrystalline ZrN 0.71 – 0.79 spheres, 60 and 90 μm diameter, was studied by the gas‐solid exchange technique using 15 N as a tracer at a nitrogen pressure of 220 Torr and at temperatures in the range 1000°– 1200°C. These specimens were characterized by chemical analyses, density, lattice param…
From an analysis of the infrared spectra of dimethylaminophenols and their methiodides, along with their —N(CD3)2 and —N+(CD3)3 derivaties, the characteristic absorptions of the —N(CH3)2 and —N+(CH3)3 groups have been assigned. Strong absorptions near 950 cm–1, generally ascribed to C—N stretching modes in a large num…
The penetration of leakage flux into a laminated machine or transformer core is governed by the currents induced in the steel, and poses an anisotropic and 3-dimensional field problem which is also severely nonlinear. It is shown that the differential equations can be formulated in terms of an electric vector potentia…
Artificial intelligence research, as a part of computer science, has produced a variety of programs of experimental and applications interest: programs for scientific inference, chemical synthesis, planning robot control, extraction of meaning from English sentences, speech understanding, interpretation of visual imag…
The ionisation of AlBr3 in MeBr and of AlCl3 in EtCl and CH2Cl2 between –78 and 0 °C have been studied by electrical conductance measurements in vacuo. Consistent results with these notoriously irreproducible systems were achieved by new purification methods, whose effectiveness was assessed by functional tests. The s…
The results of an experimental investigation of nitric oxide decomposition at high temperatures are presented. Mixtures of NO in argon (0.01-5.0 percent) and NO with H2 in argon (1 percent NO, 1 percent H2) were reacted in a ceramic flow tube reactor at temperatures between 1500 K and 2100 K at atmospheric pressure. T…
Hydroplaning potential of pavement is defined as the inability of the accumulated water to escape from the tire-pavement contact area. The potential is measured in terms of the speed above which hydroplaning occurs; that is, the vehicle tires are lifted off the pavement and supported by a water wedge formed between ti…
Diffusion coefficients of hydrogen in the Group V transition metals, i. e. vanadium, niobium and tantalum, and those in vanadium alloys containing chromium, iron, niobium and titanium were measured in the temperature range of 500∼1100°C by the absorption method. The following results were obtained:(1) Diffusion data a…
Pure RMgH compounds have been prepared, as stable tetrahydrofuran solutions at room temperature, by the reaction of the corresponding R2Mg compound with an active form of MgH2 in THF; in this way MeMgH, EtMgH, PriMgH, and CpMgH have been prepared and characterized (Cp = cyclopentadienyl).
The Vk centre in halide crystals is often described in terms of an X2− molecule ion. Recent molecular calculations for the halogen molecule negative ions have enabled a detailed comparison to be made between the theoretical anion and the results from optical and spin resonance studies on the crystals. The optical abso…
The liquidus temperature of the Al2O3-Nd2O3 system was measured from the cooling curve of specimens by the specular reflection method with a heliostat type solar furnace. Quenched specimens from the melt were examined by X-ray diffraction technique, petrographic microscopy and chemical analysis.The single phase of NdA…