Materials Literature
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Departure from linearity in the stress-strain relationships and plastic deformation are observed in reactor grade graphite at very small stresses. A model is put forward which describes the mechanical behaviour of such a material and a simple mathematical theory is derived which is shown to give an adequate descriptio…
Certain minerals in soil clays may be directly estimated from diffraction line intensity and the mass absorption coefficient of the sample to the radiation used. The main advantages of the method described are that no internal standards or calibration charts are required, and any dif-fraction line of the component to…
The suboxide of boron, B 6 O , has been prepared as a pure crystalline powder and in dense solid masses. The existence of B 6 O was substantiated from crystallographic, chemical, and density data. Information on x‐ray diffraction, chemical formation, oxidation resistance, and stability is also described. B 6 O was fou…
The list of known finite simple groups other than the cyclic, alternating, and Mathieu groups consists of the classical groups which are (projective) unimodular, orthogonal, symplectic, and unitary groups, the exceptional groups which are the direct analogues of the exceptional Lie groups, and certain twisted types wh…
Abstract not Available.
Pyrolized graphite samples are produced by pyroly tic deposition on substrates at temperatures of 1700 to 2500 deg C. A review is presented of the basal plane and c-direcion conductivities, electrical anisotropy, Hall coefficient, and magnetoresistance of these samples, as functions of the deposition temperature and t…
W. P. Griffith, Q. Rev. Chem. Soc., 1962, 16, 188 DOI: 10.1039/QR9621600188
Abstract not Available.
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Analyses of natural minerals suggest the wide variety of both cationic and anionic substitutions possible in the pyrochlore structure. Limits on the possibilities of ionic substitution in pyrochlore have been determined by the preparation of a large number of compounds. An important feature found is that substitution…
Abstract Precipitation of poly(acrylic acid) by added salts has been investigated under various conditions. The PAA was neutralized to various degrees of ionization α by tetra‐ n ‐butyl ammonium hydroxide. The minimum salt concentration C̄ s at which precipitation occurs was determined at various polymer concentration…
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C O : P R LI IN RIE AN THE GEOMETRY OF A SURFACE Relationships between space and surface tensors and their derivatives in normal coor inates Deformation and strain Stress and couple result ts; equations of equilibrium The constitutive equations of the linear theory Remarks on the general theorems of the linear heoryAD…
Abstract : This Memorandum discusses the bremsstrahlung radiation emitted during the collision of low-energy electrons with neutral atoms and molecules. The discussion is limited to the case of low-energies E or = 1 ev, and soft photons, h omega E, where E is the electron kinetic energy, and omega is the radiation fre…
The thermal conductivity of several Ge-Si alloys was determined in the temperature range 300\ifmmode^\circ\else\textdegree\fi{} to 1200\ifmmode^\circ\else\textdegree\fi{} K. A strikingly large decrease in the lattice thermal conductivity in the entire temperature range was found upon alloying. The temperature dependen…
Appearance of cellulose microfibrils in the medium of a suspension of cells of Acetobacter xylinum in buffered glucose solution was preceded by a stage during which the cellulose in the medium was amorphous within the available resolution. The size of the vertical axis of the microfibrils of the bacterial cellulose wa…
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Iron was anodically oxidized in a borate‐boric acid buffer solution of p H 8.4 in the potential range extending from the active region to oxygen evolution. In the active region there appeared to be some on the surface. In the passive region the iron was covered with an oxide film 10–30Aå thick, depending on the potent…
General equations describing the behavior of porous electrodes are developed. These equations are used to determine the initial and the steady‐state conditions in one‐dimensional porous electrodes of uniform geometry and polarization parameters. In particular, it is shown that the current and reaction distributions in…
De Duve and his colleagues, a few years ago, originated the concept of lysosomes based on the biochemical analysis of isolated cytoplasmic particles (1). He reported that a number of hydrolytic enzymes are concentrated in a fraction consisting of small subcellular units which sediments between the usual mitochondrial…