Materials Literature
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A single configuration model containing nonorthogonal magnetic orbitals is developed to represent the important features of the antiferromagnetic state of a transition metal dimer. A state of mixed spin symmetry and lowered space symmetry is constructed which has both conceptual and practical computational value. Eith…
Presents a method of measuring the thermal conductivity of very tiny and fragile samples, based on the differential thermal conductivity technique. To illustrate the possibilities of this method the authors have measured the thermal conductivity of filaments of NbSe 3 (10 mu m in diameter and 3 mm in length) in the te…
The conductivity of phosphate glasses containing two transition metal oxides, vanadium and iron oxides, has been investigated. Mossbauer spectroscopy studies of the valency state of iron ions excluded the influence of the electron transition Fe 2+ to Fe 3+ on the conductivity for the case in which the content of V 2 O…
Transparent electrically conducting SnO 2 films were prepared by the chemical vapour deposition technique. The films were deposited at substrate temperatures of 400, 450 and 500 degrees C by stannous chloride oxidation. The optical absorption studies, using unpolarised light, indicated that the deposition temperature…
Abstract Zur Synthese der Phthalocyanine (I)‐(IV) mit Phenoxy‐ oder Phenylthio‐Resten geht man von den entsprechend substituierten Dinitrilen wie z.B. der Verbindung (V) oder Phthalsäure‐anhydriden wie z.B. (VI)‐(VIII) aus.
This Test Guideline describes a method to determine the fat solubility of solid and liquid substances. The fat solubility of a substance is one of the data for evaluating the storage of lipid soluble materials in biological tissue. This test method can only be applied to pure substances, non-reactive with triglyceride…
High-resolution ac calorimetry measurements have been performed on a liquid-crystal material exhibiting a stacked-hexatic-$B$---smectic-$A$ phase transition. The transition appears to be second order with a pronounced, symmetric heat capacity peak and no observable thermal hysteresis. The data can be fitted by a power…
The metallic (high-pressure) phase of ${(\mathrm{TMTSF})}_{2}$P${\mathrm{F}}_{6}$ exhibits Shubnikov---de Haas resistance variations at low temperatures. A single frequency of 0.76 MG has been recorded. A large anisotropy in the transverse magnetoresistance is also observed. Our results imply a two-dimensional Fermi s…
The results of an in situ study of calcite dissolution in the Panama Basin indicate that the rate of dissolution in the water column increases suddenly below a water depth of about 2800 meters. This coincides with the depth at which the calcium carbonate content of surface sediments begins to decrease rapidly or the s…
We present a theory of the cholesteric blue phase, assuming a first-order cholesteric-isotropic transition. We show, on the basis of the Oseen-Frank elasticity equations, that the planar helix structure, generally associated with the cholesteric phase, becomes unstable at temperatures near the transition point. It tra…
Abstract The polymer(Poly A) which contains alloxan moiety was prepared by the oxidation of the copolymer of allyl barbituric acid and vinyl acetate with chromium trioxide. The photoreduction of Poly A by ultraviolet (UV) irradiation was used to isolate the polymer(Poly A·) in which the alloxan radical was present. Th…
Abstract TL studies of CsBr, CsBr:Ag + , CsBr:Cu + , CsCl:Ag + , and CsCl:Cu + crystals X‐irradiated at liquid nitrogen temperature are made. Both, undoped and impurity‐doped CsBr crystals exhibit two main glow peaks at 116 and 159 K. CsBr:Ag + crystal exhibits three additional glow peaks (weak) at 133, 176, and 192 K…
The adsorption of carbon monoxide on a stepped Fe(111) surface around 300 K was studied by low energy electron diffraction, thermal desorption spectroscopy and Auger electron spectroscopy. Similar detailed experiments on Fe(110) and (111), some of which were reported in Surf. Sci. 75 (1978) 46, were also performed. On…
Exposure of kraft wood pulps to an acidic medium results in a destabilization of wood pulp. The degree of destabilization appears to depend on the concentration of acid the pulp is exposed to. The addition of calcium carbonate to acid destabilized pulp does not restore the pulp to its original stability. The absorptio…
Properties of CO can be explained in part due to the unusual electronic picture of CO.
Methodology often used to estimate the consequences of postulated nuclear reactor accidents was applied in an analysis of the SL-1 reactor accident, which occurred in January 1961. The work focused on use of the CORRAL and CRAC computer codes to predict radionuclide leakage from the accident and resulting downwind env…
In an attempt to resolve the disagreement between previous theoretical calculations of the $2s$ partial photoionization cross section in neon, we have examined in detail the relative contribution from the initial-state configuration interaction and the final-state interchannel interaction. In addition, we have calcula…
Abstract Atactic and isotactic polystyrene powders were fractured with a ball mill at −196°C. The molecular weight distributions at various milling times measured by GPC show an initial asymmetric broadening and then a gradual returning to the original narrow bell‐shaped distribution. Analysis of molecular weight dist…
A family of modified-sulfur cements has been developed by the Bureau of Mines for the preparation of construction materials with improved properties. Various types of sulfur cements were prepared by reacting sulfur with mixtures of dicyclopentadiene (DCPD) and oligomers of cyclopentadiene (CPD). Durable cements were p…
The recent volcanic activities of Mt. St. Helens starting with a minor eruption on March 27, 1980, followed by major eruptions on May 18 and 25 and June 12, 1980, precipitated investigations of possible effects of volcanic ash fallout on the Pacific Northwest power system. This report discusses the pattern and impact…