Materials Literature
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Abstract.- Ion dynamics computer simulations of the migration of cation and anions in "computer glasses " and liquids of silicate and fluoride types are reported, and examples of the diagnostic power of the simulation method are given. The existence of high pressure minima in the viscosity of molten…
The corrosion of glass was studied using SIMS. The leaching of sodium ions bonded to non-bridqing oxygen atoms is governed by the diffusion of H2O. The sodium ions bonded to AlO4-groups undergo an ion exchange with H3O+ .
Mg(BH 4 ) 2 • 3 THF was prepared from MgHo and B 2 H 6 in tetrahydrofuran. It crystallizes monoclinically, space group C2/c, Z = 4. The crystal structure reveals that the molecule contains a seven-coordinate Mg center. Its BH 4 groups form double hydrogen bridges to magnesium. The geometry at Mg corresponds to a sligh…
Abstract The Raman spectra of KHSO 4 single crystals in different geometries have been investigated in the 10–4000 cm −1 range at 300 K, 150 K and 120 K. The infrared spectra of polycrystalline KHSO 4 have also been measured. An interpretation of these results consistent with the crystal structure and other informatio…
Abstract The nature of organo-phosphate and carboxylate bonding in aqueous suspensions of noncrystalline alumina, boehmite, and gibbsite has been studied using the anionic nitroxide spin probes 3-carboxy-2,2,5,5-tetramethyl-1-pyrrolidinyloxyl and 4-hydroxy-2,2,6,6-tetramethyl-piperidinooxyl dihydrogen phosphate. Analy…
"Modern Crystallography II. Structure of Crystals." Optica Acta: International Journal of Optics, 29(12), p. 1586
Summary Chemical and mineralogical properties of ochreous brown earths have been studied with particular reference to: (1) the distribution within the profiles of Fe and Al compounds; (2) the occurrence of smectite‐like clay minerals in surface horizons. Ochreous brown earths studied belong to a developmental sequence…
In view of the importance of the ice rule imposed on the proton configurations in hydrogen bonded crystals, a cluster approximation is developed and applied to the phase transition in squaric acid. A particular emphasis is laid on the fact that in squaric acid the strong coupling between the lattice distortion and pro…
The intergranular fracture in Cu-based shape memory alloys is most hazardous for the application of these alloys. In order to clarify the cause of the fracture, the fracture behavior of several Cu-Al-Ni bicrystals with different orientation relationships have been examined by tensile tests. From these results, it has…
Abstract Curing of carboxylated nitrile rubber (XNBR) with epoxy resin in presence of different fillers has been studied. It was observed that 7.5 phr of resin give a compromise combination of properties in FEF black (N 550)‐filled vulcanizates at 40 phr loading. Further studies at different loadings of black, reinfor…
The electric insulators for superconducting magnet coils to be used in a large fusion reactor are subjected to large compressive and tensile stresses to a maximum level of about 400 MPa, and these stresses should pose a significant electrical insulating problem in practice. In this paper, dc and ac dielectric breakdow…
The change in the morphology of lath martensite with deformation of austenite (ausforming) has been studied by using an 18 % Ni maraging steel. Specimens in austenitic state were deformed in tension by several strains (true strain ε = 0.1 ∼ 1.0) at 773 K (which was above Md temperature). In the case of conventionally…
In this review it has been pointed out that vitamin B6 and its vitamers can be involved in many interactions with a number of drugs, as well as with the actions of various endocrines and neurotransmitters. Nutritional deficiencies, especially of vitamins and proteins, can affect the manner in which drugs undergo biotr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas-phase heteroaromatic substitution. 2. Electrophilic methylation of pyrrole and N-methylpyrrole by CH3XCH3+ (X = fluoro, chloro) ionsGiancarlo Angelini, Cinzia Sparapani, and Maurizio SperanzaCite this: J. Am. Chem. Soc. 1982, 104, 25, 7084–7091Publication Date (Print):De…
Measurements of the pressure ($P$) dependence of the superconducting transition temperature ${T}_{c}$ of K${\mathrm{C}}_{8}$ and KHg${\mathrm{C}}_{4}$ are reported. K${\mathrm{C}}_{8}$ undergoes a first-order transition from a ${T}_{c}=0.13$ K to a ${T}_{c}=1.7$ K phase over the range $2<~P<~15$ kbar. A KHg${\ma…
The Fermi surface of NiTi, which has the B2 structure, was calculated. The results were used to find the nesting conditions epsilon i (k)=- epsilon i (k+Q). A theory of phase transitions in NiTi based on the temperature-dependent Green function method is suggested. The theory agrees satisfactorily with experimental re…
Abstract The gas‐phase decomposition of n ‐heptyl‐1 and n ‐heptyl‐2 hydroperoxides C 7 H 15 OOH, which split into two radicals C 7 H 15 O and OH, has been investigated in the temperature range of 250–360°C. The decomposition has been carried out in a hydrogen–oxygen mixture (the hydroperoxide represents about 50 ppm)…
Dislocations interact with grain boundaries during yielding, creep, and recrystallization. It will be assumed that the dislocation model for grain boundary structure is valid generally. Consequently, Burgers vectors are conserved and dislocation lines can end only on other dislocations or free surfaces. The following…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
Fracture mechanics techniques were employed to study stress corrosion cracking (SCC) of AISI C‐1018 mild steel in hot (92°C) solutions of and . Tests were conducted under potentiostatic conditions at the most susceptible SCC potentials near the active‐passive transition, using fatigue precracked double cantilever beam…