Materials Literature
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The latest techniques in scanning electron microscopy have been applied to this study. In cholesterol gallstones, the fracture surface generally shows a crystalline plane radiating pattern, often showing dendritic growth, around the nucleus. On the surface or fracture plane of a cholesterol stone, parallelogram crysta…
The scattering of thermal energy atomic and molecular beams from macroscopically rough surfaces has been found to display scattered flux distributions that are typically skewed towards the incoming, beam i.e., backscattered. Such an observation is consistent with the results reported in the literature describing flow-…
Interdiffusion in Co-Ni alloys was studied in the temperature range between 880° and 1300°C, using diffusion couples of pure cobalt and nickel. Matano’s method was employed to determine the interdiffusion coefficient, \ ildeD, as a function of concentration.It was found that above 1190°C, \ ildeD behaved as in an idea…
Abstract We have studied the compounds with metal/tellurium ratio less or equal to unity in the ternary system NiCoTe. The limits of the homogeneity range of the hexagonal (Ni, Co) 1–x Te phase have been fixed for different Ni/Co ratios. The compounds formed in the series (Ni λ Co 1–x ) 0,75 Te and (Ni x Co 1–x ) 0,…
Abstract Electron Microscopic Studies of Amylose Fibrils and Star‐Shaped Molecules Derived from Glycogen in the Form of the Iodine Complex. The amylose‐iodine complex crystallizes in the form of fibrils with uniform diameters of 40 Å. From very diluted solutions single rodlike molecules of the same diameter are obtain…
The planar Hall effect in ferromagnetic Ni-Fe alloys (Ni content at 100%, 80% and 50%) is observed. At room temperature it is found that in addition to the quadratic dependence on magnetization there also exists a parabolic dependence on the applied field for a field above the magnetic saturation. This is explained by…
The phase diagram for the system has been determined in detail. Although no intermediate compounds were found in the system, two extensive solid solution regions having the and structures were found to exist. is a newly discovered polymorph stable above 1390°C. The divalent tin‐activated luminescence of various phases…
Differential thermal, thermogravimetric, and derivative thermogravimetric analyses were used to study the effects of two important fire retardant chemicals ammonium phosphate and ammonium sulfate -on the pyrolysis and combustion of cellulose. To aid in the interpretation of treated cellulose thermograms, the thermal b…
The strength at room temperature of Mg-4 wt% Zn polycrystalline alloys (grain size: about 50 μ) in various aging states has been studied by the tensile test and electron-microscope observations. It is found that this alloy is age-hardened by the following mechanism.(1) The yield strength in the early stage of aging (p…
A homologous series of cholesteryl (trans-p-n-alkoxy) einnamates has been prepard by reacting trans-p-n-alkoxy cinnamoyl chlorides with cholesterol, and its mesomorphic behaviour studied. All the members of the series are enantiotropic mesomorphic. The lower members of the series exhibit cholesteric mesophases, wherea…
Th e in fra red spec tra of matri x iso la ted BaO, have bee n o bse rv ed and ass igne d. Ba ato ms were a ll owe d to react with a n a rgo n oxyge n mixture a nd co nd e nsed o n a li qu id hydroge n cuo led s urface .
Bis-2,5-(2-benzazolyl)hydroquinones, a new class of luminescent benzazoles, possess unusally long wavelength luminescence between 630 and 730 nm.
The chemical structure of glycoside G (I), C36H56O13, mp 232-233°, [α]19D+30.2°(EtOH) and glycoside K (V), C40H66O16, mp 240-241°, [α]20D -27.58°(MeOH) were isolated from Bei-Wujiapi (cortex of Periploca sepium BGE.) and established to be periplocin and Δ5-pregnene-3β, 20α-diol(20)-β-D-glucopyranosyl (1glu→6glu)-β-D-g…
The possible interaction has been studied between plastics and several drugs and pharmaceutical adjuvants such as parabens, quaternary ammonium salts, and HCO-50 (polyoxyethylene derivative of hydrogenated castor oil). It was found that hydrophobic interaction plays a major role in adsorption of parabens to several pl…
IO2–4(ε360ca. 1000 M–1 cm–1) ions and IO4˙ε520ca. 3000 M–1 cm–1) radicals are formed by pulse radiolysis of periodate ion in aqueous solution.
The Born model of the ionic crystal is used to calculate the energies of formation of point defects in CaF2 and UO2 in the zeroth, first and second orders. The results of calculation, to all orders, indicate that anion-Frenkel pairs are the intrinsic defects in CaF2 and are in agreement with previous calculations. In…
The changes in the electrical resistivity of nickel-rich Ni-Nb alloys due to the formation of short-range order exhibit an anomalous dependence on the solute concentration. This anomaly can be explained by the formation of embryos of long-range order of the type Ni8Nb in alloys approaching the NisNb composition and ne…
Abstract Der Einfluß der Elektronenreemission auf die Anlaufkennlinie wird berechnet und mit Messungen an den Primärelektronen in einer Niederdruckentladung verglichen. Die Messungen zeigen die von der Rechnung vorhergesagten Strukturen, die auf der Energieabhängigkeit des Reemissionskoeffizienten beruhen. Aus der Mat…
The kinetically controlled alkylation of palladium corrole ambident anions occurs both at the nitrogen atom (N-21) of ring A and at a peripheral carbon atom (C-3). Variation in solvent, from dipolar aprotic to strongly hydrogenbonding, allowed some control of the C:N alkylation product ratio. The palladium 2,3,7,8,12,…
Several mono and bistrithiocarbonates were synthesized by the reaction of the correspondingmono and bisepoxides with carbon disulfide in the presence of potassiumhydroxide. These trithiocarbonates were successfully obtained even in the presenceof a catalytic amount of potassium hydroxide. Potassium methoxide instead o…