Materials Literature
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Dissolution profiles for solid dose forms represent several observations over time on an experimental unit such as a tablet or capsule. The pharmaceutical scientist is interested in a (statistical) comparison of these profiles under a variety of conditions relating to formulation characteristics, and lot-to-lot and br…
Three new glycosides named cynapanosides A (1), B (2), and C (3) which contain a new aglycone, glaucogenin D (10), were isolated from Cynanchum paniculatum, in addition to the known compounds, cynatratoside B (5) and 3β, 14-dihydroxy-14β-pregn-5-en-20-one (13). Their structures were elucidated by spectroscopic and che…
The rate of methanol formation from H2/CO synthesis gas over the binary Cu/ZnO catalyst can be greatly increased on doping with caesium without increasing the formation of higher oxygenate products above 1.1 mol%.
Outre une clé des familles, les auteurs proposent dans cet opuscule une clé des principaux genres planctoniques et une clé des espèces planctoniques des genres les plus communs dans les eaux continentales françaises ou européennes. Ces clés s'appuient sur des caractères morphologiques, anatomiques et écologiques aisés…
The film formation of magnesium stearate on the surface of acetylsalicylic acid was investigated by applying a flow-through dissolution technique. The effect of mixing time, lubricant surface area, and the addition of colloidal silica was studied. The film formation increased by increasing mixing time. The final level…
Abstract Short glass fiber reinforced polypropylene is one of the composites with the widest range of applications in the plastics industry. The partial replacement of the glass fibers by sepiolite, brings forth a hybrid composite with better mechanical properties and, as a result, enhanced compatibility and better in…
STP 909 has sixteen peer-reviewed papers divided into four sections that reflect changes in the nuclear power industry occurring since 1981, including escalating capital requirements and a growing worldwide dependence on nuclear power for electricity prod
Abstract Rutherford backscattering spectrometry (RBS) is a major materials characterization technique that can provide information in a short analysis time. It is used for quantitative compositional analysis of thin films, layered structures, or bulk materials and to measure surface impurities of heavy elements on sub…
Description A practical book containing background information and research results of particular interest to materials engineers who design structures subject to possibility of failure by fracture. Categories: ductile fracture, test methods development, surface cracks and crack shape effects, and high temperature and…
The muscle of carp was fractionated into water-soluble, alkali-soluble (0.1N NaOH), acid-soluble (0.5M acetic acid), hot water-soluble (extraction with water at 120°C for 1h), and residual fractions. The analyses of amino acid and SDS-polyacrylamide gel electrophoresis showed that collagen in the muscle was quantitati…
The changes in the distribution of type III collagen in bovine skin samples of increasing age have been examined. Analysis of layers from bovine skin of various ages has shown that type III collagen was present in all samples and that the proportion of type III collagen present was greatest in the youngest tissues and…
The polarization resistance is often measured to determine the corrosion rate. However, the electrochemical response signal may become distorted by the presence of a corrosion product film on the metal surface. A number of methods have been devised to overcome this difficulty, but these frequently require more sophist…
Abstract The crystal of β′-(BEDT-TTF)2ICl2 has a modified structure of organic superconductor, β-(BEDT-TTF)2I3. Unlike the β-type salt with a two-dimensional(2D) electronic structure, the anisotropy of the intermolecular overlap integrals of HOMO of BEDT-TTF in β′-(BEDT-TTF )2ICl2 suggests the 1D character of the elec…
We discuss the dominant geometrical aberrations of a grazing incidence reflection grating and new techniques which can be used to reduce or eliminate them. Convergent beam geometries and the aberration correction possible with varied groove spacings are each found to improve the spectral resolution and speed of grazin…
Reduction of porous and dense pellets of ferric oxide were carried out with methane in the temperature range of 1073 to 1298K. The reduction pattern was, broadly speaking, topochemical. Volume of pellets increased upon reduction except at 1298K. Extent of carbon deposition in pellets increased linearly with increasing…
We propose a theory for the zero viscosity (η) or infinite temperature (T) intercept (τ0) in the much used quasihydrodynamic expression τ2=τ0+(const)(η/T) for the second rank orientational correlation time (τ2). Whereas we associate the (η/T) term with the integral over the torque–torque correlation function, we attri…
Blue Phases are cubic crystals with large unit cells. In two systems we studied we find experimentally that they orient with their [100] axis parallel to an electric field, E. By analysing the non-linear polarizability, which we describe in terms of the relevant fourth rank tensor, we show that cubic blue phase crysta…
Water and acetate solutions were irradiated under argon by 300 kHz ultrasonic waves. Oxygen was found to be generated besides the products H2 and H2O2, already known. In the presence of acetate the O2 yield decreased rapidly while that of H2O2 decreased more slowly. Succinic acid was found as a product of the attack o…
Compounds of the type Y3[Sb2BrnCl9–n]{Y = Hpy [pyridinium(1+)], n= 0–9; Y = NMe4+, n= 0,3,6, and 9; and Y = Cs+, n= 0,3,6, and 9} have been prepared by a variety of methods and investigated by i.r. and Raman spectroscopy, mass spectrometry, and X-ray single crystal and powder diffraction. Two further mixed halides [Hp…
The thermal unimolecular decompositions of benzaldehyde (BA), crotonaldehyde (CA), and furfural (FA) have been investigated in a flow reactor at very low pressures by modulated beam mass spectrometry above 1040 K. Each reaction proceeds by a different mechanism. Whereas BA decomposes by C(O)-H bond fission CA readily…