Materials Literature
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A phase transformation is observed in scandium metal at a pressure of approximately 170 kbar as seen from a rise of the electrical resistance by a factor of 4. The high-pressure phase (Sc II) is a superconductor. ${T}_{c}$ is found to increase with pressure from \ensuremath{\simeq} 50 mK at 186 kbar to \ensuremath{\si…
Abstract Two sets of ozonization reactions, for 1 h and 24 h respectively, have been carried out at −20°C on degraded samples of PVC having different contents of tactic sequences. The evolution of the polyene sequences distribution with the ozonization was followed by UV‐Visible spectroscopy. The number of chain sciss…
Material usages from 1900 are traced with emphasis on introduction of new materials and alloys. The historic prospective taken also extrapolates current developmental trends into the future. The paper is divided into three periods---1900-1940-THE PAST, after World War II to 1978-THE PRESENT, and THE FUTURE. The future…
In preparation for peening an outdoor bronze sculpture, glass beads (the abrasive) are loaded into a metallic hopper. This vessel, after being filled with beads, operates by accepting compressed air (the propellant medium) through a single entrance pipe and dispensing (at a variable rate) the abrasive laden medium thr…
The method for measuring the stopping power of materials for charged particles using ion-induced x-ray emission is described in detail, and the results for 100-keV protons on yttrium and samarium are presented to exemplify the method. By utilizing a lithium-drifted silicon detector, the thickness and uniformity of the…
The variation of longitudinal magnetoresistance with angle and strength of an applied field is used to determine the anisotropy energy and its strain dependence in 80-20 and 90-10 Permalloy films. The results can usually be interpreted in terms of single-domain theory. Measurements for applied strains at angles other…
One of the textile industry’s largest consumers of energy is the tenter frame dryer. To assist the industry in operating these dryers efficiently, a mathematical model which simulates the drying process and a scheme to solve for the parameters in the differential equations of the model have been developed and are pres…
Abstract Changes in transparency and color as well as G HCl values of hard PVC foils exposed to gamma radiation were investigated while using different amounts of the stabilizers ethylene glycol bis‐β‐aminocrotonate (I), calcium/zinc laurate + epoxy compounds (II), and magnesium/zinc stearate + sorbitol + epoxy compou…
Abstract A technique for producing thin film samples WS 2 is reported. Exciton peak positions are measured as a function of hydrostatic pressure to 3500 atm at 90 K and temperatures in the range 90 to 300 K. Values for (∂ E /∂ P ) T for the A‐ and B‐peaks are 5.9 × 10 −6 and 7.2 × 10 −6 eV/atm, respectively. Peak C sh…
Abstract Die Lösewirkung von Systemen aus Säreanhydrid beziehungsweise Särechlorid des Schwefels oder Phosphors und polarer organischer Flüssigkeit beziehungsweise aus Säureanhydrid oder ‐chlorid, aliphatischem Amin und polarer organischer Flüssigkeit gegenüber Cellulose wurde verglichen. Es wurde festgestellt, daß si…
<div class="htmlview paragraph">The paper describes the results of matching calculations showing the effect of reduced heat loss on the interaction between an engine and the turbomachinery components. The engine used is the Perkins 6.354 six cylinder engine with low compression ratio pistons. Results are shown o…
Abstract The unit cell of Ag 7 GeS 5 I, a member of the argyrodite family, is cubic face-centered with a = 1072.2(7) pm and Z = 4. The anion lattice consists of three-dimensionally connected Frank-Kasper polyhedra with C. N. 12 and 16. The silver ions are statistically distributed over a number of sites with C. N. 4,…
The effect, of fiber diameter and crimp frequency on the filtration performance of nonwoven fabrics were examined empirically. It was found that if fabric weight and density are kept constant, air permeability varies linearly with fiber diameter. When filtering a very dilute aerosol of submicron particles, the capture…
Article A Study of Hydrogen Diffusion in Titanium Hydride using Nuclear Magnetic Resonance Techniques* was published on February 1, 1979 in the journal Zeitschrift für Physikalische Chemie (volume 115, issue 2).
Electrical resistivity in c-direction (ρ c ) as a function of temperature ( T ) has been investigated of a number of highly crystalline specimens of kish and pyrolytic graphites in relation to their structural perfection evaluated by the basal-plane resistivity ratio between 300 K and 4.2 K ( R T =ρ a (300)/ρ a (4.2))…
Methods are developed to treat the nonlinear propagation of edge dislocations in atomic lattices. Static or low-velocity calculations incorporate Eshelby’s analytic solution of the elastic equations. At higher, even transonic velocities, a novel fixed-displacement boundary is used to allow steady-state propagation of…
The electrooxidation of sulfur in AlCl 3 ‐ NaCl ( 63 – 37 mole percent ) has been investigated in the temperature range 150°–250°C. The oxidation of sulfur proceeds from S 8 to SCl 3 + and involves intermediates S 8 + ( S 16 2 + ) , S 8 2 + , and S(I).
Abstract The exciton reflection spectra of free tetracene single crystals and those in optical contact with different substrates (quartz, glass, muscovite) are measured in polarized light at temperatures ranging from 300 to 4.2 K. Peculiarities in the reflection spectra of a free crystal are due to a phase transition…
Abstract The thermochemical and flammability characteristics of laminating resins and composites currently in use and others being considered for use as aircraft interior panels are described. The properties studied included: (a) limiting oxygen index of the composite constituents; (b) fire containment capability of t…
Abstract The dispersion of Pd, Rh, and Ir supported catalysts had been studied by means of oxygen‐hydrogen chemisorption and high resolution electron microscopy. The good agreement among the methods had been obtained for catalysts with well‐dispersed active phase (crystallites 1–6 nm). It confirmed the simple adsorpti…