The Hall effect, thermoelectric power, and electrical conductivity have been measured as a function of temperature in crystals of $p$-type titanium sesquioxide. A transition is observed at about 450\ifmmode^\circ\else\textdegree\fi{}K. Below this temperature the crystals behave like semiconductors, while above it the…

Transition Metal Oxide NanomaterialsMagnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter Physics

Diffusion along Small-Angle Grain Boundaries in Silicon

H. J. Queisser、Kurt Hübner、W. Shockley1961-08-15Physical Review

Diffusion fronts in samples containing grain boundaries are spike shaped. Velocity of spike advance and angle between spike and boundary are measured. The "spike-velocity method" of analysis permits evaluation of two effective widths, ${W}_{D}$ and ${W}_{0}$, which describe the diffusion properties of the boundary. Th…

Microstructure and mechanical propertiesSilicon and Solar Cell TechnologiesSemiconductor materials and interfaces

Some New Interrelations in the Properties of Solids Based on Anharmonic Cohesive Forces

J. N. Plendl1961-08-15Physical Review

The lattice vibration spectrum of a solid can be characterized by one single frequency, which is defined as "the frequency of the center of gravity" of this spectrum or simply "center frequency." From its equality with the characteristic frequency of specific heat we have recently derived the "center law of the lattic…

Boron and Carbon Nanomaterials ResearchForce Microscopy Techniques and ApplicationsHigh-pressure geophysics and materials

Stimulated Optical Emission in Fluorescent Solids. II. Spectroscopy and Stimulated Emission in Ruby

Theodore H. Maiman、R. H. Hoskins、I. J. D’Haenens 等 5 位作者1961-08-15Physical Review

Optical absorption cross sections and the fluorescent quantum efficiency in ruby have been determined. This data has been used to correlate calculations with the analysis of the preceding paper. Stimulated emission from ruby under pulsed excitation has been studied in some detail; the observations are found to depend…

Mineralogy and Gemology StudiesGlass properties and applicationsLaser Applications in Dentistry and Medicine

Die biochemischen Grundlagen der „Polyacetat‐Regel”

Frédéric Lynen、Mariko Tada1961-08-07Angewandte Chemie

Abstract Natürlich vorkommende organische Substanzen sind vielfach nach gewissen Regeln, Gesetzmäßigkeiten, gebaut. Solche Bauregeln sind nicht nur zur Konstitutionsaufklärung neuer Naturstoffe nützlich, sondern können, wie hier gezeigt wird, auch bei der Erforschung biochemischer Umsetzungen als Leitfaden dienen. Aus…

biodegradable polymer synthesis and propertiesEnzyme Catalysis and ImmobilizationEnzyme function and inhibition

THE SAFETY OF RESEARCH REACTORS

J.F. Croft1961-08-01Nuclear Power

The safety problems of research reactors are discussed. Safety of these reactors depends principally from the rahin them, and the penetrating radiations emitted. The safety requirements for reactivity containments, control instruments and mechanisms, guaranteed supplies, and operations of the research reactors are des…

Graphite, nuclear technology, radiation studiesNuclear and radioactivity studiesNuclear reactor physics and engineering

Particle Self-Shielding in Plates Loaded with Spherical Poison Particles

W. B. Doub1961-08-01Nuclear Science and Engineering

An approximate heuristic expression for the particle self-shielding factor for a set of purely absorbing spheres of radius r and volume fraction V well mixed with another set of non-absorbing spheres has been derived.The resulting expression has been experimentally verified using transmission data at several incident…

Nuclear Physics and ApplicationsGraphite, nuclear technology, radiation studiesNuclear and radioactivity studies

Termination in anionic polymerization of octamethylcyclotetrasiloxane. formation of stable complexes on active sites

M. Kučera、M. Jelı́nek、J. Láníková 等 4 位作者1961-08-01Journal of Polymer Science

Abstract The ionic polymerization of octamethylcyclotetrasiloxane (the tetramer) proceeds through successive additions of tetramer on active centers. The active centers consist of the ion‐pair magnified image (where M stands for Na, K, Rb, Cs, Me 4 N−, Bu 4 P−, etc.) formed through the reaction of the hydroxide (oxide…

Synthesis and properties of polymersSilicone and Siloxane ChemistryPhotopolymerization techniques and applications

Neutralization of residual catalyst in polydimethylsiloxane. effect of neutralization on the thermal stability of the polymer

M. Kučera、J. Láníková、M. Jelı́nek1961-08-01Journal of Polymer Science

Abstract It is known that the thermal stability of polydimethylsiloxane is adversely affected by the presence in the siloxane polymer of active chain ends (i.e., by residual catalyst). The presence of catalyst causes the degradation reactions to proceed through an ionic mechanism (as opposed to the free‐radical mechan…

Silicone and Siloxane ChemistryCorrosion Behavior and InhibitionPhotopolymerization techniques and applications

Stress-Strain Relationships in Yarns Subjected to Rapid Impact Loading

Jack C. Smith、Paul J. Shouse、Josephine M Blandford 等 4 位作者1961-08-01Textile Research Journal

Stress-strain curves at rates of straining up to 440,000%/min. have been obtained for a number of textile yarns by a technique involving high-speed photography of the yarn following transverse impact. These curves and others obtained at conventional speeds are presented for samples of acetate, triacetate, cotton, poly…

Textile materials and evaluationsMechanical Behavior of Composites

Investigation of maleate‐fumarate isomerization during esterification with various glycols

I. Vancsó‐Szmercsányi、K. Maros-Gréger、E. Makay‐Bödi1961-08-01Journal of Polymer Science

Abstract It is known that maleic acid is partially and completely converted to fumaric acid, or its ester, on esterification. This phenomenon has a great practical importance, especially for unsaturated polyesters, because of the properties of the maleates, notably their reactivity during copolymerization, where their…

Thermal and Kinetic AnalysisPolymer Synthesis and Characterizationbiodegradable polymer synthesis and properties

The Preparation and Properties of Silyl Methyl Ether1

Burt Sternbach、Alan G. MacDiarmid1961-08-01Journal of the American Chemical Society

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation and Properties of Silyl Methyl Ether1Burt Sternbach and Alan G. MacDiarmidCite this: J. Am. Chem. Soc. 1961, 83, 16, 3384–3388Publication Date (Print):August 1, 1961Publication History Published online1 May 2002Published inissue 1 August 1961https://pubs.acs.…

Analytical Chemistry and ChromatographyMesoporous Materials and CatalysisMolecular Junctions and Nanostructures

Extreme Ultraviolet Reflectance of LiF-Coated Aluminum Mirrors

D. W. Angel、W. R. Hunter、R. Tousey 等 4 位作者1961-08-01Journal of the Optical Society of America

Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text D. W. Angel, W. R. Hunter, R. Tousey, and G. Hass, "Extreme Ultraviolet Reflectance of LiF-Coated Aluminum Mirrors," J. Opt. Soc. Am. 51, 913-914 (1961…

Optical Coatings and GratingsOptical Systems and Laser TechnologyPhotorefractive and Nonlinear Optics

Dislocations in visco-elastic materials

J. D. Eshelby1961-08-01Philosophical magazine

An expression is found for the force required to move a dislocation steadily through a visco elastic medium, in particular Zener's standard linear solid. It is applied to the case of a screw dislocation in iron exhibiting the Snoek effect. Sohoeok and Soeger'e atomic treatment of the same problem contains an error. Wh…

Force Microscopy Techniques and ApplicationsMaterial Properties and Failure MechanismsMicrostructure and mechanical properties