Materials Literature
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Abstract It was found that carbon disulfide copolymerizes with N ‐(β‐cyanoethyl) ethylenimine by using water as a catalyst. The copolymerization was conducted in detail by using water as a catalyst in the temperature range between 0 and 50°C with various initial concentrations of carbon disulfide and N ‐(β‐cyanoethyl)…
In this paper the author deals with the diatom from the Yodo estuary of Osaka, Japan. The samples were taken from the surface of the stone at four stations near the river mouth of the River Yodo on October 12, 1977. In all 49 taxa of diatoms were identified, of which 37 were alive and 12 were observed only in cleaned…
Abstract For the prediction of possible failures due to SCC as well as for corrosion prevention by anodic or cathodic protection, the evaluation of critical potential ranges for susceptibility to SCC is of great practical importance. For this purpose, accelerated testing techniques have been described in the literatur…
The pressure-composition-temperature relations for niobium selenides NbSex were determined by annealing the sample under controlled selenium vapor pressure in the composition range x=1.48−2.00. There exist five phases; Nb2Se3, 2H(a), 3R, 2H(β) and 4H . The 2H(a) and 3R phase are known stable over a wide range of nonst…
This DOI is not currently attached to any metadata records. DOIs can’t actually ever be deleted (they’re persistent), but sometimes our members create DOIs in error. We do have a process to approximate deletion which we follow only in rare cases where the DOI has been genuinely created in error, and most crucially, if…
Abstract Anläßlich der Gewinnung von Hederagenin (1) sind die Perikarpien von Sapindus mukorossi Gaertn . auf unbekannte Inhaltsstoffe untersucht worden. Es sind Stigmasterin, Stigmasteryl‐β‐D‐glucopyranosid, β‐Amyrin (2) , 28‐Norolean‐12‐en‐3β, 17β‐diol (3) und 3,23‐Ethylidenhederagenin (4) gefunden worden, wobei 4 m…
La décomposition thermique globale d'un nouveau polymère, le poly-α-acétoxystyrène est étudié par thermogravimétrie : avec la programmation linéaire de température, avec les isothermes de décomposition. Deux domaines de décomposition distincts sont mis en évidence, d’une part entre 140 et 200 °C, d'autre part au-dessu…
The Fifth Conference on Composite Materials: Testing and Design was held 20-22 March 1978 at New Orleans, La. The American Society for Testing and Materials' Committee D30 on High Modulus Fibers and Their Composites sponsored the conference. S. W. Tsai, A
In en effort to increase the structural efficiency of aerospace vehicles, r ecent designsx have been making use of low density, high etrength, brittle materials. Ae a result, the vehicle structure ie considerably more suscept ible to ,damage due to impact loadings. Aircraft impact loadings can be divided into two type…
The preparation of powder plays an important role in the manufacture of sintered ferrites. The characteristics of the ferrite powders are influenced by method of preparation which subsequently influence the properties of finished products. Various chemical methods such as conventional coprecipitation, spray drying, py…
Abstract Different forms of oriented inclusions in single crystals of potassium dihydrogen phosphate (KDP) grown by gel method and from aqueous solutions are reported. Small rod like chain and channel types of liquid inclusions are illustrated. These inclusions are oriented along 〈001〉, 〈011〉 and 〈010〉 directions and…
In the event of a loss-of-coolant accident in water-cooled reactors, the Zircaloy-2 cladding is subjected to a rapid increase in temperature and stress in an oxidizing environment. Accurate numerical values of creep parameters are thus required for use in tube deformation models that predict fuel cladding behavior dur…
The thermodynamic properties of the thorium-oxygen system at high temperatures have been investigated by means of mass effusion, mass spectrometric, and transpiration techniques over compositions ranging from the congruently vaporizing composition to the lower phase boundary composition. A very sharp decrease in oxyge…
The surface self-diffusion coefficient of silver was measured by the grain boundary grooving method in atmospheres with various oxygen potentials. In an argon atmosphere with PO2=10−11 Pa, the surface self-diffusion coefficient can be expressed by the following equation:Ds=0.249exp(−166kJ/mol·RT)m2⁄s(973–1073K).This e…
The paper discusses the interference studies carried out on Williams domains in the case of N-(p-propoxybenzylidene) p-pentylaniline. Measurements of the periodic variation of the orientation of the director in the nematic medium are reported.
Abstract A metastable modification of SrSiO3 was formed at 850–910 °C from mixed powders prepared by the alkoxy-method. Crystallization isotherms were best described by the first-order equation and the activation energy was determined as 130 kcal/mol. The kinetics on the transformation of metastable to stable SrSiO3 w…
The detailed crystal structure of anhydrous aluminum sulfate, Al2(SO4)3, has been determined from X-ray powder diffraction with well crystallized powder sample. The grain was rhombohedron in shape and surrounded by crystal-faces of {0 1 1 2} planes. The unit cell was assigned to hexagonal symmetry with a0=8.032Å, c0=2…
The thermal behavior of mono (2-ethylhexyl) phthalate (monoester) was investigated in a batch system over the temperature range from 80 to 250°. After a 12 hr reaction period, around 7% of the monoester was decomposed at 80°. The decomposition reached 50% at 150°and 90% at 250°. The reaction products were bis (2-ethyl…
Tests were made of Kevlar® fiber blends of 5, 10, 15, and 20% with cotton. The processing efficiency of cotton/Kevlar blends compared favorably with that of blends of cotton with 15, 25, 35, and 50% of polyester or 15% nylon. Lower twists were required for yarns spun from the cotton/Kevlar blends for optimum strength,…
Helium permeability, diffusivity, and solubility have been measured for sodium, potassium, rubidium, and cesium germanate glasses, and for one series of sodium-potassium germanate glasses. In each case, the helium permeability and diffusivity exhibit minima in the property-composition curves. These minima shift to gre…