Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Effect of Structure on Reactivity in Semicarbazone Formation1Bruce M. Anderson and William P. JencksCite this: J. Am. Chem. Soc. 1960, 82, 7, 1773–1777Publication Date (Print):April 1, 1960Publication History Published online1 May 2002Published inissue 1 April 1960https:…
Microscopic observation, thermal analysis, measurement of electrical resistivity and X-ray study of WO 3 were carried out in relation to the phase transition from room temperature down to -70°C. The crystal of WO 3 is monoclinic ( a =7.30Å, b =7.53Å, c =7.68Å, β=90°54') at room temperature, and it transforms to tricli…
Phase equilibria in the ferrite region of the system FeO–MgO–Fe 2 O 3 have been investigated up to 1300°C. over an oxygen‐pressure range of 1.0 to 0.01 atmospheres. The five most important features of the equilibria in this system are as follows: (1) The spinel phase can exist with a deficiency of oxygen in the high‐m…
lieferte folgende Atomabstande: 1,62:J: 0,01 A fUr die tetraedrische Si-O-Bindung, 1,75:J: 0,02 A fiir die tetraedrische Al-O-Bindung und 2,37:J: 0,02 A fUr die Na-O-Bindung. Die Offnungen zwischen benachbarten Ketten der Faserzeolithe formen ziemlich weite Kanale, die die Struktur durchziehen. Die beobachteten Aus-ta…
A two year investigation of two freshwater alkaline lakes and two saline lakes in the Lower Grand Coulee has provided a quantitative and qualitative record of many of the seasonal changes occurring in the non‐planktonic algae. A glass plate method satisfactorily recorded quantitative changes in the attached algae. The…
Abstract Melting point depressions were determined by dilatometric and microscopic measurements for polyacrylonitrile in dimethylformamide and in γ‐butyrolactone. These data give for the glass transition and melting point of the pure polymer 104 and 317°C., respectively. Both the heat and entropy of fusion are low. Th…
(1960). DIMENSIONAL STABILITY OF PLAIN-KNIT FABRICS. Journal of the Textile Institute Proceedings: Vol. 51, No. 4, pp. P200-P209.
The relative intensities in the nitrogen afterglow, from 5000 to 11 000 A, have been measured in pure nitrogen and after addition of several foreign gases. Most of the bands in the recently discovered Y — B 3Πg system are overlapped by B 3Πg — A 3Σu+ bands but intensity assignments have been made. Changes in relative…
The transverse and longitudinal wave measurement on polystyrene and polymethyl methacrylate was carried out at frequencies of 0.5, 1, and 2.25 Mc, in the temperature range 20°C to 190°C. For the transverse wave measurement, a modified rotating plate method was used. An energy-dissipating process associated with volume…
Forty-four pure cultures of marine littoral diatoms (43 pennate and 1 centric) have been studied to determine (a) whether any accessory organic factors (vitamins) are essential for growth in light, and (b) whether the cells can grow in darkness using glucose, acetate, or lactate as substrates.Six isolates were shown t…
Abstract A treatment is given of the effect of network flaws due to the finite chain length of the primary elastomer molecules on the elastic properties of rubber vulcanizates. In this treatment full allowance is made for the elastically inactive material which exists either as sol or as loose ends of the network. The…
A neutron diffraction study has been made of the magnetic properties of the rare-earth-iron perovskites, NdFe${\mathrm{O}}_{3}$, HoFe${\mathrm{O}}_{3}$, and ErFe${\mathrm{O}}_{3}$, at temperatures ranging from 955\ifmmode^\circ\else\textdegree\fi{} to 1.25\ifmmode^\circ\else\textdegree\fi{}K. The iron ions in each of…
This paper discusses some effects of mobile electrons in some antiferromagnetic lattices. It is shown that these electrons (or holes) always give rise to a distortion of the ground state spin arrangement, since electron transfer lowers the energy by a term of first order in the distortion angles. In the most typical c…
Abstract Studies of the kinetics of adsorption of oxygen on zinc oxide over the temperature range from 25 to 390°C have provided evidence for two distinct types of chemisorption, one prevalent below 200 and the other above 300°C. This pattern of activity has been confirmed by measurements of desorption rates over the…
The Madelung formulas for the electrostatic potential of a linear or planar Bravais lattice of ions, neutralized by a uniform distribution of charge, are extended to the lattice sums over a linear or planar Bravais lattice involving two-body interactions of the type ${R}^{\ensuremath{-}n}$ ($R$, interatomic distance;…
RbHS${\mathrm{O}}_{4}$ is ferroelectric below -15\ifmmode^\circ\else\textdegree\fi{}C. The room-temperature phase is monoclinic, with space group $\frac{P{2}_{1}}{c}$, $a={14.35}_{6}$ A, $b={4.62}_{2}$ A, $c={14.80}_{7}$ A, $\ensuremath{\beta}=121.0\ifmmode^\circ\else\textdegree\fi{}$ and $Z=8$. The symmetry of the fe…
Received 15 February 1960DOI:https://doi.org/10.1103/PhysRevLett.4.282©1960 American Physical Society
An important unanswered question concerning the sidewise motion of 180\ifmmode^\circ\else\textdegree\fi{} domain walls in single crystal BaTi${\mathrm{O}}_{3}$ is the mechanism by which the boundaries move. This paper considers two possible models. One model assumes that the wall motion results from the repeated nucle…
Corrosion and weldability studies have been made on Cr-Mn-Ni and Cr-Mn-N grades of austenitic stainless steel to determine their usefulness for chemical plant applications. These studies show that the corrosion resistance of Type 202 (18% Cr-5% Ni-8% Mn-0.10% max. C) stainless steel is comparable to that of Type 304 s…
A comprehensive survey of the literature on the tearing strength of fabrics is presented. The various test methods employed for determining tearing strength, the machines and instruments used in making these tests, and the different expressions for tearing strength are discussed. The elfccts of the type of fibre, clot…