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A new apparatus for the investigation of the dynamic friction of fabric is described. The apparatus is designed so that frictional forces may be recorded as a function of the orientation of the fabric relative to a specified direction. Most of the experimental data have been obtained for the friction of a fabric on it…
Abstract From x‐ray diffraction data, a pseudohexagonal unit cell with a = b = 14.94 A. and c = 7.93 A. has been obtained for partially dried precipitate of amylose and tertiary butyl alcohol. Geometrical considerations establish a helical amylose configuration which has seven glucose residues per helix turn.
The three-body recombination of O atoms by Ar catalysts was measured over a temperature range of 1340–2920°K in a shock-tube experiment. The excess amount of O atoms was produced by shocking dilute O3–Ar mixtures. Under the experimental conditions, the O atoms in excess of equilibrium produced by the reaction O3+M→O+O…
Extensive covers of epilithic diatoms seldom develop on intertidal substrates in southern Oregon in the presence of grazing animals and macroscopic algae. If an area is cleared, however, a brown coating of diatoms often appears in 2 to 3 weeks, but the density depends on the season and the local conditions during tida…
This paper presents an analysis of an idealized polyphase hysteresis machine. The distributed magnetic field within the machine is described in terms of dimensions and windings. A single-phase equivalent circuit is developed for the machine and expressions are given for the parameters of this equivalent circuit and fo…
The magnetocrystalline anisotropy constants of Gd have been measured from 10° to 350°K. The behavior near the Curie temperature (about 300°K) is unusual: a fairly large, strongly field-dependent apparent anisotropy persists to temperatures at least 30° above the Curie temperature, and in the range 250° to 285°K this a…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation H. Blank, S. Amelinckx; DIRECT OBSERVATION OF FERROELECTRIC DOMAINS IN BARIUM TITANATE BY MEANS O…
Liquidus surfaces of two planes, one with 4.5 percent acmite and 4.5 percent sodium metasilicate and the other with 8.3 percent acmite and 8.3 percent sodium metasilicate in the system NaAlSi ~3~ O ~8~ -KAlSi ~3~ O ~8~ -SiO ~2~ -H ~2~ O (P ~H2~ O = 1000 kg/cm ^2^ ) were determined. The minima on the two liquidus surfa…
Abstract The potential energy of polyethylene, polytetrafluoroethylene, polyoxymethylene, polyisobutylene, polyvinylidene chloride, and isotactic polypropylene with a helical conformation has been calculated as a function of the angles of rotation around the bonds of the backbone chain. The use of appropriate function…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of Discrete Eight-Coördination. II. The Crystal and Molecular Structure of Zirconium(IV) AcetylacetonateJ. V. Silverton and J. L. HoardCite this: Inorg. Chem. 1963, 2, 2, 243–249Publication Date (Print):April 1, 1963Publication History Published online1 May 2…
Barium ferrite platelet-shaped particles have been prepared with a diameter of 0.1 microns, which is an order of magnitude smaller than those obtained by conventional sintering and regrinding techniques. The preparation technique used has been optimized to produce the complete ferrite with σs=68 emu/g. Due to the smal…
The general analysis of uniformly moving dislocations in anisotropic media is applied to investigate the dynamical behavior of dislocations in the primary slip systems of body-centered cubic crystals. Both edge and screw dislocations on the {110}, {112}, and {123} slip planes are considered; in each case, the Burgers…
Magnetic measurements on a single crystal of MnP indicate strong ferromagnetic interactions at room temperature and cast doubt on previous ferrimagnetic or canted spin models. A new first-order transformation has been observed at 50°K below which MnP is metamagnetic, i.e., it exhibits a ferromagnetic-antiferromagnetic…
Ohm's law in strongly magnetic, though not necessarily ferromagnetic materials, has leading terms in the presence of a magnetization M and an induction B of the form E=ρJ−R0J×B−R1J×M+Δρ/M2(J·M)M+…,which represent the ordinary and extraordinary Hall effects and a magnetoresistance. The M-dependent terms, in particular,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE HEATS OF FORMATION OF TANTALUM CARBIDES1Elmer J. Huber Jr., Earl L. Head, Charles E. Holley Jr., and Allen L. BowmanCite this: J. Phys. Chem. 1963, 67, 4, 793–796Publication Date (Print):April 1, 1963Publication History Published online1 May 2002Published inissue 1 April…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Properties of N,N-Difluorohydroyxlamine-O-fluorosulfonate, NF2OSO2FMax Lustig and George H. CadyCite this: Inorg. Chem. 1963, 2, 2, 388–390Publication Date (Print):April 1, 1963Publication History Published online1 May 2002Published inissue 1 April 1963https:…
The isothermal galvanomagnetic behavior of an isotropic conductor in a magnetic field can be described by the vector equation E=ρ⊥j+n(j·n) (ρ∥−ρ⊥)+ρH(n×j),relating the electric field E to the current density j. The resistivities ρ∥ and ρ⊥ are those which result when the magnetic induction is parallel to j, and normal…
A discussion of the various physical processes relevant to the ionization of solid particles is given. Detailed considerations of the rates of thermionic and photoelectric emission from charged particles, electron attachment and recombination with charged particles and energy exchange in these processes are presented.…
The elastic moduli of pyrolytic graphite, a polycrystalline material exhibiting large elastic anisotropy, have been measured by the ultrasonic pulse-echo method. In units of 1011 dyn/cm2, they are c11 = 5.21, c12 = 1.88, c13 = 1.80, c33 = 2.58, and c44 = 0.15.
The viscosity of liquid water between −10° and +150°C (Psat=4.7 atm) is expressed by the equation: η=A exp[B/ (T−T0)], in which A = 290 μp, B = 510°, and T0 = 150°K. The true temperature-independent activation energy for viscous flow is E = RB = 1020 cal/mole. The ``free volume'' representation uses the equation η=A e…