Chemical Studies on the Constitution of Some Pollen and Spore Membranes
(1964). Chemical Studies on the Constitution of Some Pollen and Spore Membranes. Grana Palynologica: Vol. 5, No. 2, pp. 247-252.
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Ultrasonic Relaxation near the Curie Temperature of Ferroelectric Triglycine Sulfate
According to a theory developed by Landau and Khalatnikov, the approach of long-range order to equilibrium can be characterized by a relaxation time with a temperature dependence of the form: τ=β/(Tc − T), where β is constant and Tc is a second-order phase transition temperature. The ferroelectric material, triglycine…
The Fate of the Intact Orb Web of the Spider Araneus Diadematus Cl. 1)
When spider webs were left intact in the aluminum-glass boxes in the laboratory, most animals ate old webs daily and built new ones. The new webs were built with a larger amount of thread protein, increasing steadily in weight with increasing length of the non-elimination period, to more than 3 times in 8 days. The in…
7—A GENERAL SYSTEM OF WOVEN-FABRIC GEOMETRY
The principles of plain-weave geometry established by Peirce1 and Kemp2 are extended to weaves other than plain to give a system of fabric geometry applicable to all types of woven cloths. A particular application of the system to the measurement and specification of fabric tightness is also described.
Semiconducting Behavior of Substituted Tungsten Diselenide and Its Analogues
Tantalum substitutions up to 5 atomic per cent (a/o) of the cations have been made in the three Group VIB dichalcogenides, , , and . Tantalum‐substituted p‐type had the best thermoelectric properties with a figure of merit about . Substitution of a number of other elements was attempted in the compounds and , but only…
Photoconductivity in Ag2O
Abstract The spectral distribution of photoconductivity in Ag 2 O was measured on samples prepared in three different ways. The photoresponse was found to depend on the mode of preparation of samples and on previous light exposure. Samples prepared by pressing Ag 2 O powder against a cellulose backing showed a photoco…
75. Diffuse-reflectance spectra of some anhydrous transition-metal halides
R. J. H. Clark, J. Chem. Soc., 1964, 417 DOI: 10.1039/JR9640000417
Room Temperature Oxidation of Iron at Low Pressures
The oxidation at 300° K of high purity iron surfaces prepared under ultra-high-vacuum conditions was studied using ellipsometry to measure film thickness. By working at low oxygen pressures (between 10–7 and 10–4 torr) it was found that the early stages of the oxidation process followed a linear growth law with rate b…
Shear and Structural Relaxation in Molten Zinc Chloride
Longitudinal ultrasonic absorption and velocity measurements were made in molten zinc chloride in the frequency range 5–95 Mc/sec. Shear relaxation measurements were obtained in the frequency range 43–118 Mc/sec. A single relaxation time was observed for the absorption of longitudinal waves at each temperature investi…
Spectral Properties of Rare Earth Oxide Phosphors
A study of rare earth oxide phosphors activated by rare earths revealed that fluorescence occurs only in those matrices where the cation possesses no unpaired electrons. The fluorescent intensities of the rare earth activators were divided into three categories, strong, medium, and weak, each having a characteristic e…
Effect of Pressure on Young's Modulus and the Glass Transition in Rubbers
Measurements of Young's modulus as a function of pressure up to 10 000 bars at 20°C show that the glass-transition temperature in natural and synthetic rubbers is raised by pressure. For natural gum rubber, the transition occurs at 5100 bars at 20°C and Young's modulus increases 1000-fold on passing through the transi…
Über die Hydroxidhalogenide Me2(OH)3Cl, ‐Br, ‐J zweiwertiger Metalle (Me = Mg, Ni, Co, Cu, Fe, Mn)
Abstract The preparations of the 3:1 hydroxide halides Me 2 (OH) 3 Cl, ‐Br and ‐I of Mg, Ni, Cu, Co, Fe and Mn are described, and the corresponding X‐ray data registered. The following structures were found: Layer structures : (a) C6 type [α‐Mg 2 (OH) 3 Cl, α‐ Ni 2 (OH) 3 CI, α‐Co 2 (OH) 3 Cl, α‐Fe 2 (OH) 3 CI, α‐Mn 2…
392. Topochemistry. Part X. The crystal and molecular structures of 2-chloro-N-salicylideneaniline
The first page of this article is displayed as the abstract.
Structures magnétiques de Cr3X4 (X = S, Se, Te)
Les composés monocliniques pseudo-hexagonaux (groupe I/2m) Cr3X4 = □ Cr2+I (Cr3+II)2 X24- (X = S, Se, Te) dérivent du type NiAs. Les lacunes □ ordonnées du réseau des cations se trouvent dans des plans (101). Dans l'hypothèse d'interactions isotropes, on déduit théoriquement les configurations magnétiques possibles. L…
SEGREGATION AT GRAIN BOUNDARIES
Grain boundaries in crystalline solids exert a pronounced influence on almost all the properties of polycrystalline bodies, as well as affecting the kinetics of most solid-state processes that occur therein. They have therefore been the subject of numerous theoretical and experimental researches in both metallic and n…
Shape of three-fold extended nodes
L. M. Brown and A. R. Thölén, Discuss. Faraday Soc., 1964, 38, 35 DOI: 10.1039/DF9643800035
Activated complex theory applied to the thermal decomposition of solids
_allows a possible interpretation of the mechanism of the. reactions and prediction or the experimental rate constants of similar reactions. The decompositions involving Mgco 3 and Caco 3 a:re m.ost suitable for detailed analysis on the basis of the availabill ty of dependable rate data. and infrared crya tal spectra…
Mechanochemical Anodic Dissolution of Austenitic Stainless Steel in Hot Chloride Solution at Controlled Electrode Potential
The influence of metal yielding on the anodic dissolution rate of 18Cr‐8Ni stainless steel in 42 weight per cent (w/o) aqueous magnesium chloride solution at 154°C has been examined under conditions of controlled potential. At −0.14v ( e H ) in solution flowing at 52 cm/sec to eliminate concentration polarization, yie…
507. Some cyclic tetra-amines and their metal-ion complexes. Part I. Two isomeric hexamethyltetra-azacyclotetradecanes and their copper(II) and nickel(II) complexes
N. F. Curtis, J. Chem. Soc., 1964, 2644 DOI: 10.1039/JR9640002644
The 80 Diperiodic Groups in Three Dimensions
The law-energy electron diffraction work of L. H. Germer, J. J. Lander, A. U. MacRae, J. Morrison and others is resulting in new information about surface structures. These three-dimensional structures have periodicity only in two dimensions. The 230 triperiodic space groups are not applicable to the solution of these…