Materials Literature
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Previous investigations have shown that matallic derivatives of bridgehead substituted adamantane compounds do not possess enough stability to be synthetically useful. Intial attempts to prepare such derivatives from 2-bromoadamantane at elevated tamperatures also failed, where-as treatment of this compund with methyl…
Under the axial tensile force in the fiber direction the distribution of crystal lattice strain in the b-axis direction of the cellulose (I) in the cell wall of tracheids were measured by the X-ray diffraction technique using (040) reflection of cellulose micelles.In this study the transit X-ray method was used and th…
The synthesis and characterisation of anhydro-2-arylamino-1,3,4-oxadiazolium hydroxides (II), a new class of meso-ionic compounds, is described.
Abstract The experimental study at 25°C of the system KClRbClCsClH 2 O has shown the existence of a new type of quaternary system with formation of mixed crystals. — The solubility diagram is characterized by the presence of one univariant line and one binary miscibility gap. Two types of solid solutions are presen…
Cubique, isotype de la tétraédrite, a = 10,88 ± 0,01 Å ; Z = 8, dx = 6,3. Les raies les plus intenses du diagramme de poudre sont : 3,140(10) ; 2,910 (7) ; 1,985 (7) ; 1,925 (9) ; 1,639 (8) Å. Les analyses chimiques (microsonde électronique) donnent : Cu 26,6 (26,6) ; Hg 15,3 (14,3) ; Sb 15,5 (19,1) ; As 3,2 (0,7) ; S…
A phase diagram of Al-Si system in the hypoeutectic region at 28kb has been composed. A girdle-type high pressure device was used to press and heat the specimens, and an electric resistance method to detect the phase transitions. The characteristic figures obtained are as follows;(1) The melting point of pure Al has b…
The ternary subsolidus phase equilibria has been determined for that portion of the system containing less than 50 m/o (mole per cent) . Limits of solid solution along the orthophosphate join were determined for , , and . The 3:3:2 compound had a rapid, reversible inversion at 1104°C and melted incongruently at . melt…
Summary. To study the site and mechanism of its ovulation-inhibiting effect, clomiphene citrate was implanted bilaterally into the hypothalamus and hypophysis of adult di-oestrous rats and of prepuberal females which were also treated with oestradiol benzoate. The results suggest that this effect is primarily due to t…
Unit-cell parameters have been measured for some alkali-metal hexanitrolanthanates. The electronic spectra of these complexes closely resemble that of NaNO2, as expected for very weak lanthanide–nitrite bonding, although the lowest triplet absorption is much more intense than in NaNO2. Ce(NO2)63– shows metal–ligand el…
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 .