Materials Literature
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Etude experimentale du champ de temperature d'un faisceau de 37 aiguilles chauffees electriquement refroidies par une circulation forcee ou naturelle de sodium liquide. Comparaison des resultats obtenus avec les valeurs calculees a l'aide du programme COBRA-IV-I
Abstract The heat capacity of a narrow molecular weight distribution polystyrene, National Bureau of Standards—Standard Reference Material 1478, has been determined by a fully automated adiabatic calorimeter from 5 to 380 K for the sample subjected to different thermal history. The number‐average molecular weight of t…
The structure of molten B2O3 at ca. 650 °C has been investigated by the X-ray radial distribution method. The most likely two-dimensional quasi-crystalline model for the short-range arrangement is a mixed structure of boroxol rings and independent BO3 triangles. The estimated density for this model with an average int…
Abstract Intermediate phases and reactions occurring on decomposing diammonium hydrogen phosphate, ammonium para molybdate, sodium tungstate dihydrate and ammonium meta vanadate were established by thermal analysis and X‐ray examination. These salts promote fabric degradation at low temperatures but are effective at h…
A method is described for synthesizing sodium polysulfides of stoichiometries Na2S3, Na2S4, and Na2S5 by the direct reaction of sodium and sulfur. The reaction is carried out in the furnace well of an inert−atmosphere glove box and features the slow addition of sulfur to molten sodium at temperatures ranging from 100–…
The thermodynamics of hydrolysis reactions show that hydroxyle groups are not stable in glass melt at high temperature. A refining stage carded out at 1000°C for 1 h results in low-OH-content bulk glasses. Preforms were prepared by this method and drawn into fibers. The maximum absorption of 2.9 μm was 110 dB/km and a…
Molybdenum trioxide dissolves in dimethyl sulphoxide (dmso) to give a solution from which the polymeric complex [{MoO3(dmso)1.33}n](1a) may be crystallised. It also reacts with pyridine N-oxide (pyo), triphenylarsine oxide, and pyridine (py) to give insoluble polymeric complexes [{MoO3(pyo)}n](2), [{MoO3(AsPh3O)0.5}n]…
A V-shaped segregation, found in a sulfur print of longitudinal strand section, has been macroscopically investigated. A simple model, using polyethylene particles of 2mm diameter, has been prepared to simulate formation of the V-shaped segregation.The results obtained are summarized as follows:(1) The V-shaped segreg…
A γc alumina carrier is shown to be partly hydrated to bayerite or gibbsite in contact with an ammonia solution, or even water, at room temperature, and to boehmite when heated at 410K and a pressure of 0.3 MPa in water.
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
A new species of diatoms, intermediate between Nitzschia cylindrus (Grun.) Hasle and Nitzschia pseudonana Hasle is described. Differences in morphology of the three species are outlined. The new species has been recorded only between 37°N and 53°N in the Pacific Ocean while N. cylindrus is bipolar and N. pseudonana is…
The chemical and physical processes involved in formation of mesophase pitch are described. Carbonaceous mesophase exhibits properties of both nematic liquid crystals and glass-like pitches. Mesophase development requires polymerization of aromatic pitch components to a sufficient molecular size, and a proper concentr…
There are good reasons to believe that adhesion of particulate matter in all wet, salty, biochemically active circumstances follows a common pattern, and that such adhesion can be effectively controlled by adjusting the surface properties - especially surface energy--of the substrate involved. One of the most compelli…
An extensive program of slow-strain-rate stress corrosion testing of aluminum alloys in a wide variety of susceptibility conditions and environments produced results fully consistent with the expected behavior from service experience and the results of other established test methods. Tests were conducted both on labor…
The temperature-composition phase diagram for the GeSe-GeTe system was determined between 25 and 675°C using high temperature X-ray powder diffraction techniques (1). The orthorhombic phase extends from 100 to 92 ± 3 mol% GeSe and is stable below 651 ± 5°C. For compositions between 86 ± 3 and 58 ± 3 mol% GeSe a hexago…
The purpose of this study is to develop high strength nickel-base single crystal alloys for gas turbine blades.
Tetrathiafulvalene (ttf) reacts with SnX4(X = Cl or Br) in MeCN to give [ttf]2[SnX6]. The corresponding tetramethyltetraselenafulvalene (tmtsf) salt also is obtained as an acetonitrile solvate, [tmtsf]2[SnCl6]·MeCN, by the reaction of tmtsf with SnCl4 in MeCN. On the other hand, electrocrystallization of ttf and tmtsf…
Thermal effects on tensile strengths of advanced composite systems have been determined for exposure times of 100 to 50,000 hours (5.7 years). Exposures were conducted at both ambient and reduced pressures at two temperatures for each composite. At the completion of the various aging periods, specimens were removed fr…
In the complex [Os(BH4)H3{P(c-C5H9)3}2](c-C5H9= cyclo-C5H9), prepared quantitatively from the reaction of [OsH6{P(c-C5H9)3}2] with BH3·thf, (thf = tetrahydrofuran), the tetrahydroborate ligand is bound to the metal by two bridging hydrogen atoms which, at 90 °C, exchange rapidly only with the hydride ligands on osmium.
ABSTRACT TESTS were carried out to define the effects on airflow resistance of adding various percentages of various sizes of fines to whole corn kernels. The relationship between clean corn multiplier and percentage fines was defined for seven size grades of fines. Effect of fines on fan power requirements for aerati…