Materials Literature
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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…
In this paper, Rossmann & Blow describe how they have detected the existence of partial, approximate symmetry from a knowledge of the intensities alone. The effect of noncrystallographic symmetry, whether partial or total, results in decreasing the size of the structure to be determined, while the number of observable…
For a number of metallic polycrystalline aggregates, it is shown experimentally that [sgrave]f, the flow stress at constant strain, is related to the grain diameter l by where [sgrave]0 and k are constants. This has the same form as the relationship between the lower yield point, when this occurs, and grain size. An e…
Abstract The dynamic properties of a natural vulcanized rubber containing carbon black were studied for dynamic tensions of amplitude varying greatly. It was shown that both the elastic responses and viscosity change with amplitude of oscillation and with concentration and type of carbon black. The effects of thermal…
A new method of estimating the equilibrium melting temperature, Tm, of a polymer isdescribed, and applied to polychlorotrifluoroethylene (PCTFE). Experimentally de-termined values of the so-called observed melting point,!F^(obs), are plotted as a function of the isothermal crystallization temperature, Tx. When freed o…
Abstract Es werden Darstellung und Eigenschaften einiger kristallisierter Azulen‐Tetracyanäthylen‐Komplexe und deren Umwandlung in 1‐ bzw. 3‐Tricyanvinyl‐azulene beschrieben.
Abstract Determination of the phase angles of a crystalline protein requires a series of isomorphous heavy-atom compounds, with heavy atoms attached to different sites on the protein molecule. The asymmetric unit of horse oxyhaem oglobin was found to combine with heavy atoms at two different sites which are now known…
Received 22 November 1961DOI:https://doi.org/10.1103/PhysRevLett.7.442©1961 American Physical Society
The static dielectric constant $\ensuremath{\epsilon}$ of rutile has been measured as a function of temperature from 1.6 to 1060\ifmmode^\circ\else\textdegree\fi{}K. Rutile does not appear to be ferroelectric or antiferroelectric in this temperature range. At low temperatures, $\ensuremath{\epsilon}$ approaches a limi…
Abstract Azulenaldehyde‐(1 bzw. 3) sowie die entsprechenden Nitrile und Carbonsäuren geben als Pseudoaromaten unter geeigneten Bedingungen Reaktionen der analogen benzoiden Verbindungen, wobei in einigen Fällen die funktionelle Gruppe abgespalten wird. Die Azulenaldehyde entsprechen in ihrem Reaktionsvermögen weitgehe…