Materials Literature
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One of the problems associated with building any aberration-corrected electron microscope objective lens lies in the difficulty of obtaining a sufficiently short focal length. A number of systems have focal lengths in the 1cm. range, and these are more suitable for microprobe work. If the focal length can be made shor…
The image collecting system of the experimental high resolution electron microscope being developed in this laboratory must be compatible with the ultra-high vacuum (10 −10 Torr) maintained in the total column. The characteristics of an SEC porous KCl target used to record directly the primary high energy beam has bee…
Changes in dimensions which occur when fabric is released from loom are predicted. Analysis was not extended to finished fabrics, which is difficult. It is possible to predict the gray fabric dimensions of elastomeric fabrics, using relatively simple analytic methods.
The phase diagram for the system K 2 SO 4 ‐Cs 2 SO 4 was determined by using DTA for melting relations and DTA and high‐temperature X‐ray diffractometry for subsolidus relations. At the solidus the system shows complete solid solubility, with a minimum at 940°C and 50 mol% Cs 2 SO 4 . Orthorhombic K 2 SO 4 and Cs 2 SO…
An earlier postulate, that physically trapped electrons (e t − ) are responsible for a narrow e.s.r. singlet at g = 2.0028 formed by exposure of glassy propylene carbonate to 60 Co γ-rays at 77°K, is re-examined. An alternative, that propylene carbonate radical anions are formed, in which the extra electron is largely…
The thermal conductivity of CdSxSe1−x (0≤x≤1) solid solutions was measured between 100 and 300 °K. Analysis of the experimental data shows that normal processes played an important role in phonon scattering, and that mass and strain fluctuations equally contribute to thermal resistivity in the temperature range studie…
An investigation of the effects of 10.6-μm laser radiation on triglycine-sulfate (TGS) crystals determined that the primary irreversible damage mechanisms in TGS pyroelectric detectors are cracking and thermal decomposition (charring). Irradiation thresholds for cracking and charring were determined for TGS crystals o…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTRate of electron transfer between tris(3,4,7,8-tetramethyl-1,10-phenanthroline)iron(II) and -(III) ions from nuclear magnetic resonance studiesMan-Sheung Chan, J. Barry DeRoos, and Arthur C. WahlCite this: J. Phys. Chem. 1973, 77, 18, 2163–2165Publication Date (Print):August 1,…
From thermoluminescence (TL), thermally stimulated currect (TSC), and photoluminescence and photoconductivity kinetic response measurements, the excitation mechanism of the Cr3+ luminescence center in SrTiO3 is explored. Based primarily on the strong correlation between TSC and TL, it is concluded that the dominant ex…
Approximate solutions are obtained for the temperature distribution and rate of phase change for the transient one-dimensional solidification of a finite slab of a binary alloy. The alloy is selected to avoid the eutectic composition so that solidification takes place over a range of temperatures. The slab is initiall…
Article Notizen: Zur Kenntnis wasserfreier Orthophosphate der höheren Alkalimetalle: K3PO4, Rb3PO4, Cs3PO4 / On the Knowlegde of Orthophosphates of the Higher Alkaline Metals Free of Water: K3PO4, Rb3PO4, Cs3PO4 was published on August 1, 1973 in the journal Zeitschrift für Naturforschung B (volume 28, issue 7-8).
Abstract Im System Al(OH) 3 –B(OH) 3 entstehen unter hydrothermalen Bedingungen Weitgehend unabhängig von B/Al im Ansatz drei Verbindungen: bei 150 bis 160°C Al 2 O 3 · 3B 2 O 3 · 7 H 2 O(I); bei 200–‐300°C Al 2 O 3 · 2 B 2 O 3 · 2,7 H 2 O (II) und > 450°C3 Al 2 O 3 · 2 B 2 O 3 . Sie werden thermisch–I und II über…
Abstract Satisfactory rigid polyurethane foams were prepared from diethanolamides of hydroxymethylated oleate, linseed oil, safflower oil and their methyl esters. These foams were improved when the fatty polyols were blended with a commercial, low molecular weight polyol.
Abstract Two computer-oriented methods are presented in this paper for interpreting the magnetic anomalies of a dipping dike. In the first method, horizontal derivatives of the observed magnetic anomalies are calculated which define a single linear equation of the type X 4 G + C 1 X 3 G + C 2 X 2 G + C 3 XG + C 4 G +…
Abstract The crystal structure of polychlorotrifluoroethylene has been studied. The pseudohexagonal lattice parameters are a = 6.438, c = 41.5 Å. The polymer chain is found to be helical with on the average 16.8 monomer units in one turn of the helix (equal to c ). The skeletal angles on the CF 2 and CFCI atoms are fo…
Abstract The isothermal crystallization of natural rubber was investigated under biaxial stretching. A marked planar orientation of crystals occurs in such a way that the (010) plane orients parallel to the film plane. The rate of crystallization increases with the biaxial stretching ratio, and the Avrami exponent n d…
Abstract Polyurethane elastomers containing isocyanurate rings as crosslinking structure were prepared by crosslinking the prepolymers in N , N ‐dimethylformamide solution with sodium cyanide catalyst. Physical properties such as gel fraction, swelling ratio, density, glass transition temperature, Young's modulus, ten…
A new technique is presented for the automatic determination of peak positions, intensities and widths from complex numerically recorded X-ray powder diagrams. The method uses standard powders for the determination of the actual repartition of incoming radiations and the determination of the apparatus function (aberra…
A statistical mechanical model of diffusion is applied to helium diffusion in fused silica. The number of gas atoms moving solubility sites is related to the number of atoms in those sites. The number of atoms in the excited state, between two adjacent solubility sites, relative to the number occupying solubility site…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and textural studies in molybdenum sulfide systemsP. Ratnasamy, L. Rodrique, and A. J. LeonardCite this: J. Phys. Chem. 1973, 77, 18, 2242–2245Publication Date (Print):August 1, 1973Publication History Published online1 May 2002Published inissue 1 August 1973https…