Materials Literature
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The desmoplastic response to breast carcinoma is being studied. The stimulation of stromal cell proliferation by a preformed breast tumor matrix was shown. An additional mechanism for stimulating scleroprotein deposition is described here. On a per-cell basis, the synthesis of collagen and elastin was increased by 50%…
The unusual electrical properties of certain inorganic compounds which behave as quasi-one-dimensional metals are reviewed, with emphasis on the evidence which they provide for conduction by the cooperative mechanism, involving the motion of incommensurate charge-density waves (CDWs), first suggested by Frohlich (1954…
Particle-initiated breakdown characteristics in SF6 gas are investigated. Breakdown voltages are greatly influenced by particle diameter especially for AC voltages, and for very fine metallic wire particles are much higher than those for moderately thick ones. The breakdown stress of a gas gap is obtained as a functio…
The microstructure of monodispersed polystyrene latices in deionized solution has been systematically investigated by the transmitted light spectrum method. Latices used are between 85 and 246 nm in diameter and the charge density of the latex surface is between 1.0 and 36 µC cm–2. Clear peaks showing the selective Br…
Reaction of the ligand 3,6-bis(1′-pyrazolyl)pyridazine (ppd) with nickel(II) and cobalt(II) salts produces binuclear derivatives in which the two pseudo-octahedral metal centres are bound simultaneously between two adjacent ligands in a doubly bridged structure. The complex [Ni2(ppd)2(H2O)4]Cl4·2H2O (1) crystallizes i…
The microstructure of the Al2O3–ZrO2 eutectic with addition of a small amount of Y2O3 has been studied. The eutectic composition was determined as 59 mol%Al2O3–36.8 mol%ZrO2–4.2 mol%Y2O3. The added Y2O3 (2.1–5.3 mol%) dissolved only in the ZrO2 phase and the crystal structure of this phase changed from monoclinic to t…
X-ray diffraction profiles and Fourier coefficients are given for particles distributed according to experimentally verified size distributions. Calculations are based upon the log normal distribution of sphere diameters and intercept lengths in addition to a normal distribution of column heights. It is found that the…
Using cyst material produced in an indoor cyst production system from 4 Artemia strains belonging to the species A. franciscana (San Francisco Bay, California. USA; Macau, Brasil; Great Salt Lake, Utah. USA) and A. parthenogenetica (Lavalduc, France), different factors were studied that affect dormancy in brine shrimp…
The iron(III) complexes [FeL2(salacen)]PF6[L = imidazole (Him) or N-methylimidazole (mim), salacen = ethylene(N-acetylacetonylideneiminate)(N′-α-methylsalicylideneiminate)] were synthesized, and the phenomenon of the spin transition between high-spin (S=5//2) and low-spin (S=½) states depending on temperature was conf…
V2+-doped KMgF3, KMnF3, RbMnF3, CsCaF3, CsCdCl3, and NaCl single crystals are analyzed with respect to their electronic properties and their suitability as laser material for vibronic-laser operation. All systems show broadband emission and together cover the spectral range between 1.9 and 0.9 μm. KMgF3, KMnF3, RbMnF3…
Abstract
In order to obtain highly purified organic substances, sweating of crude crystalline particles was investigated with two organics; m-chloronitrobenzene and p-dichlorobenzene. By maintaining the crude crystals at a temperature close to the equilibrium one in order to form melts and followed by rapid drainage of the mel…
Information (audio, video, or data) to be recorded magnetically is first encoded into a sequence of time-varying electrical signals which are used to drive a writing head, the magnetic field of which creates, on the moving tape or disk, a spatially varying pattern of magnetization. The reading process uses another hea…
The goal of this study was to examine the quality of abrasively planed wood surfaces when variable grit sizes, feed speeds, and depths of cut are used.Our observations show that grit size and wood structure and density seem to have larger effects on the depth and type of damage than feed speed and depth of cut.Coarser…
The angular distribution of 5 eV atomic oxygen scattered off a polished vitreous carbon surface was measured on a recent Space Shuttle flight. The experimental apparatus was of novel design, completely passive, and used thin silver films as the recording device for oxygen atoms. Most of the incident oxygen was contain…
Cet inventaire des diatomées d'eau douce des îles Kerguelen (Grande Terre) a été réalisé à partir de prélèvements effectués sur 31 stations représentant divers milieux : ruisseaux, rivières, lacs, rochers suintants. Dans la présente note, 279 taxons ont été déterminés, dont 3 sont considérés nouveaux pour la science.…
Temperature and intensity dependence of steady state photoconductivity is studied in amorphous thin films of Ge22Se68Bi 10 prepared by vacuum evaporation. Photoconductivity increases exponentially with temperature between 310 K and 410 K and no maxima is found in this temperature range. The ratio Iph/ Id is about 6 at…
During the spring (H-04/82: october 11-27, 1982)carried out by the Fishery Research Vessel "Dr.E.Holmberg", the distribution of temperature, salinity, nutrients concentration and photosynthetic pigments were studied at the "Rio de la Plata" maritime front. The presence of Sub-Tropical coastal waters in only station di…
Abstract This article sets out to describe and account for the chemical and physical consequences of the presence of gross disorder in solids. Knowledge of the structure of such disordered materials is an obvious prerequisite to a further understanding of other properties and behavior, and our current knowledge of the…
Polymeric materials, although they are not volatile themselves, may be analysed by gas chromatography (GC) through the use of analytical pyrolysis. Because the fragmentation pattern produced by heating is reproducible, the pyrolysates provide much information about the original macromolecule of which they were a part.…