Materials Literature
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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…
Les spectres de diffusion Raman de monocristaux orientés sont étudiés dans les deux phases. Outre le mode ferroélectrique étudié en premier par Kaminov et Damen [1], on observe dans la phase ferroélectrique une raie fine de diffusion à 515 cm-1 liée au déplacement de l'atome de phosphore. L'étude est complétée par cel…
The effects of xenon-arc radiation, using an Atlas Weather-Ometer and a clear glass pyrex filter system, on the breaking strength, extension-to-break, and the energy-to-break for several nylon, polyester, and polyester/cotton yarns were compared to these of outdoor exposure behind window glass. Both types of exposure…
Strontium sulfate in equilibrium with aqueous solution leaches selectively from barium-strontium sulfate solid solutions at 25 degrees centigrade and at 1 atmosphere. Equilibrium concentrations of Sr ++ and Ba ++ in aqueous solution are not significantly different from values calulated on the assumption that the chemi…
Cleavage and growth faces of ammonium perchlorate have been examined by high-power interference–contrast microscopy. From the observed directions of etch-pit arrays on three crystallographically distinct faces of the orthorhombic form of ammonium perchlorate, and also from the nature of the slip bands on deliberately…
Nous avons commencé dans les précédents numéros des Annales de Physique (Tome 6, n° 4 et 5, pages 189 à 326), la publication d’une monographie consacrée à l’étude des propriétés physiques d’un système atomique en interaction avec un champ de radiofréquence.