Materials Literature
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The single-crystal electron diffraction data of poly(ethylene sulfide) reported by Hasegawa, Claffey, and Geil have been reinvestigated. Taking into account possible crystal bending effects and dynamical scattering leads to an improved structural model. The final agreement factor of R = 0.21 is considerably better tha…
Abstract The electronic structures of organic ion‐radical salts, molecular conductors, and charge‐transfer complexes are described by solid‐state models with one valence state per site. Similar models occur in π‐electron theories of conjugated molecules or in spin Hamiltonians for magnetic insulators. A localized or v…
Abstract Der Verlauf der Fettkristallisation ähnelt dem der Aggregation und Flockulierung von Kolloiden. Früher aus Meßwerten empirisch abgeleitete kinetische Gleichungen für Aggregation und Flockulierung werden auf Meßreihen der Fettkristallisation und der Ausscheidung aus Emulsionen angewandt. Die Meßwerte werden in…
A text which deals with the basic principles of materials science and technology in a simple, yet thorough manner. This edition includes more worked examples and more detailed information on certain aspects of materials science
Variable-temperature multinuclear n.m.r. studies (13C, 13C-{103Rh}, 13C-{31P}, and 31P) are reported for [Rh9E(CO)21]2–, [Rh10E(CO)22]3–(E = P or As), and [Rh12Sb(CO)27]3–. In all cases, complete fluxionality of both the carbonyl and metal polyhedra are observed at high temperatures, and at low temperatures it has bee…
Abstract The evolution of glauconite in an imperfectly drained glauconiferous profile with texture B horizon in the Antwerp Campine (Belgium) has been studied by using different techniques (DTA, TGA, XRD and chemical analysis). It has been found that (1) the glauconite sand grains are mechanically broken down into cla…
A study has been made of the changes in the adsorptive behaviour of a carbon cloth with aqueous oxidative activation. It has been demonstrated that molecular-sieve action initially present in the cloth can be eliminated by progressive activation but eventually restored after the total pore volume of the cloth has been…
Cu-Ni-Cr-Mo-B low alloy steels whose total B content exceeds a certain limit show superior hardenability when they are austenitized at lower temperatures (≤900°C), although their hardenability decreases with higher austenitizing temperatures and longer holding times. As M23(C, B) 6 in these steels is partly undissolva…
Abstract The graft copolymerization of methyl methacrylate onto collagen initiated by tributylborane was investigated in aqueous medium. The total conversion, percentage of grafting and efficiency of grafting increased with increasing collagen content. The optimum conditions on the percentage of grafting and efficienc…
The texture formation process, dislocation structures, and deformation bands observed in rolled and cross rolled [100] (001) oriented iron crystals have been interpreted from the viewpoint of fundamental dislocation behavior and the properties of low-angle dislocation boundaries. Full agreement between theoretical exp…
The air-binding surfaces of aquatic and semi-aquatic insects and spiders were examined under a scanning electron microscope. The bristles that are instrumental in binding the film of air show distinctive characteristics within each phylogenetic group. Very small species can often maintain themselves in a bubble of air…
Incoherent quasi-elastic neutron scattering experiments have been performed on oriented crystals and on polycrystalline samples of (NH3(CH 2)3NH3)MnCl4 and (NH3(CD 2)3NH3)MnCl4 compounds in the 4-300 K temperature range. Backscattering and time of flight spectrometers were used; spectra were obtained using different r…
Efficient utilization of electrical insulating materials in electrical apparatus, devices, and cables requires knowledge of the dielectric loss behavior of materials under specific voltage, frequency, and temperature conditions. The appearance of significant dielectric losses may not only represent an unnecessary ener…
This paper presents the results of experiments to investigate the effect of temperatureon the films found on 70/30 copper–nickel. The results show that the potential of 70/30 copper–nickel and 66/30/2/2 copper–nickel explain the poor resistance to impingement attack of this alloy at low temperatures, observed greater…
We found that Toyopearl HW-65C gel matrix adsorbed ferredoxin and ferredoxin-NADP+ reductase in the presence of concentrated ammonium sulfate. Ferredoxin was strongly adsorbed on the gel in 80% saturated ammonium sulfate, and ferredoxin-NADP+ reductase was adsorbed in 40% saturated ammonium sulfate. The phenomenon was…
Two procedures for the preparation of HM forms from both small-port mordenite (SPM) and large-port mordenite (LPM) have been studied. The procedures are acid attack of the NaM form and calcination of the NH4M form. The solids were characterized by chemical analysis, benzene adsorption, X-ray diffraction and precise me…
Using blue Sepharose affinity chromatography, we purified orotidine-5'-phosphate decarboxylase over 600-fold, to near homogeneity, from strains of Escherichia coli harboring the cloned pyrF gene on the multicopy plasmid pDK26. The purified enzyme has a subunit molecular weight of 27,000 but appears to be catalytically…
The surface tension and the dispersion and polar components of the surface tension for solids and liquids were estimated by contact angle measurement in order to apply these concepts to a detergency study. Two approximation methods, the extended Fowkes' equation and Wu's equation, were adopted for the calculations. Am…
A mathematical model has been developed that can predict the elastic and strength behavior of a section of a structural lumber member containing a knot and cross grain. The model, embodied in the computer program KMESHI, accounts for the presence of a knot, the associated grain deviations, and global cross grain, and…
The syntheses, via metal-ion (Mg2+, Ca2+, or Ba2+) template methods followed by transmetallation, of the complexes [ML1]X2(M = MnII, FeII, CoII, NiII, CuII, or ZnII; X = ClO4– or BPh4–) of the potentially septidentate ligand L1 formed by condensation of 1 mol of 2,6-diacetylpyridine with 2 mol of 3-oxapentane-1,5-diam…