Materials Literature
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Abstract 13C chemical shifts of solid chitin and N-acyl chitosans were measured by cross polarization/magic angle spinning (CP/MAS) NMR spectroscopy. It was found that a regenerated chitin, N-acetyl chitosan, adopts conformation almost identical to that of naturally occurring chitin in solid state. Conformation of N-d…
A comprehensive collection of spin-echo NMR spectra from nuclei of both host and transition-metal impurities ($T$) in pseudobinary ${\mathrm{Fe}}_{3\ensuremath{-}x}{T}_{x}\mathrm{Si}$ alloys taken at about 1.3 K are presented and analyzed. We summarize some new data on $3d$ elements and also review briefly some result…
Electron-diffraction investigation of single crystals of γ-poly (vinylidene fluoride) grown from the melt has revealed streaking of 0k0 reflections. The three-dimensional structure of the spikes was studied by specimen tilting during electron diffraction; streaking is maximized in the b*c* view and disappears in the a…
The oxidation states of Mn in Mn-doped BaTiO3 were investigated by ESR, supplemented by thermal analysis and electrical conductivity data. Direct evidence for the presence of Mn2+ and Mn4+ and indirect evidence for the presence of Mn3+ is presented. Based on the Jahn-Teller distortion characteristics of the various ox…
The nematic-isotropic transition temperature was measured by means of an optical technique as a function of applied magnetic field for the material octyl-cyanobiphenyl. The results represent the first unambiguous demonstration of the magnetic field term in the thermodynamic equation for a liquid-crystal phase transiti…
A very general sufficient condition for the onset of "thermodynamic" instability at a turning point is proved, assuming essentially nothing beyond the smoothness of the equilibrium-sequence in question.
Abstract The identification and quantification of the water associated with powdered clinoptilolite and clinoptilolite-bearing tuffs were made using thermogravimetric, vacuum gravimetric, and differential scanning calorimetric techniques. Inflection points on thermogravimetric curves at approximately 80° and 170°C cor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMinimum fluidization velocity at high temperaturesRanga R. Pattipati and C. Y. WenCite this: Ind. Eng. Chem. Process Des. Dev. 1981, 20, 4, 705–707Publication Date (Print):October 1, 1981Publication History Published online1 May 2002Published inissue 1 October 1981https://pu…
Abstract Nitinol has been reported to be more susceptible to electrolytic dissolution than stainless steel. This study compares corrosion of the two metals under clinical conditions and finds no significant difference.
The heat capacity of polypropylene from 0 K to 600 K is reviewed on the basis of measurements on 20 samples reported in the literature. The crystallinity dependence is critically evaluated and a set of recommended data for completely crystalline and amorphous polypropylene are derived. The effect of tacticity on the h…
The sensitivity of compressed gases to free and fixed conducting and non-conducting particle contaminants is a limiting factor in the design of electrical apparatus. Conducting particles which may result from damage to a gas-filled system constitute a serious threat to its safe and reliable operation. This deteriorati…
The electrical resistivities, grain sizes, and charge carrier densities of Sb‐doped PTC‐type BaTiO 3 ceramics were measured as a function of additional doping with 3d ions of varying concentrations. From analysis of the PTC characteristics on the basis of Heywang's model it proved possible to derive grain‐surface acce…
During the past few years the ac capacitor industry has seen almost a complete change in dielectrics, electrodes, and impregnants. The dielectric has changed from paper to all poly-propylene film, the electrode from plain foil to either metallized film, metallized paper, or embossed foil, and the fluids have changed f…
The known vanadium oxides VO 2 + y ( 0 ≤ y < 0.5 ) have been examined as cathode materials in ambient temperature nonaqueous secondary lithium cells. The discharge products have also been chemically prepared and characterized by x‐ray diffraction, thermal analysis, and magnetic susceptibility. The best cathode materia…
Abstract This article describes a study of ionizing radiation‐induced changes in the chemical composition, crystalline content and structure, and flow properties in polytetrafluoroethylene (PTFE). Irradiatins conducted in the presence of oxygen cause acid fluoride end groups to be formed, which on exposure to water va…
A simple and reliable method for measuring the sinking rate of phytoplankton is described. This technique is suitable for both heterogeneous field populations and unialgal in vitro cultures. The procedure involves use of settling columns initially containing a uniformly mixed population of cells, and calculates a sink…
The structure of a tetragonal crystal of the title compound was determined by X-ray diffraction. The space group was found to be P 4/nmm with a 6.202(2) and c 7.410(1) Å and Z 2. The structure consists of infinite sheets of distorted VO6 octahedra and PO4 tetrahedra linked by shared oxygen atoms. Shared water molecule…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of highly reactive metal powders. New procedure for the preparation of highly reactive zinc and magnesium metal powdersReuben D. Rieke, Percy Tzu-Jung Li, Timothy P. Burns, and Sung T. UhmCite this: J. Org. Chem. 1981, 46, 21, 4323–4324Publication Date (Print):Oc…
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
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text T. K. Gaylord and M. G. Moharam, "Thin and thick gratings: terminology clarification," Appl. Opt. 20, 3271-3273 (1981) Export Citation BibTex Endnote (…