Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Luminescent molecules near metal surfaces can have dramatically decreased quantum efficiencies and lifetimes. For example, decreases of \ensuremath{\sim}${10}^{3}$ in quantum efficiency and in lifetime occur for nitrogen atoms within 3 nm of potassium surfaces. This paper presents experimental decay curves for light e…
The problem of experimental evaluation of the complex stress intensity factors K at the apices of sharp V-notches in homogeneous, isotropic and elastic plates, symmetrically loaded in their planes, is treated by applying the experimental method of reflected caustics. The symmetry in loading and in position of the notc…
Molluscan bivalve hinge ligaments are composed of long needle-shaped aragonite crystals embedded in a protein matrix. These crystals are twinned and, in general, the twin forms a thin lamella through the center of the crystal.
Abstract Frank first became interested in dislocations through reading Taylor’s 1934 paper. He wrote to Taylor, pointing out that his model was two-dimensional, and asking if a dislocation had to be a straight line. This letter was not answered, and Frank did not think further about dislocations until he came to Brist…
According to a study carried out by Arthur D. Little, a leading firm of consultants, demand for semiconductors is expected to grow by an average of 20 per cent a year up to 1983. The report points out that the growth in sales will be due to increases in demand for electronics equipment and a marked fall in the price o…
Abstract In eutektischer Kalium‐Natriumnitratschmelze wurden stationäre Stromspannungskurven an Stahl St 37 aufgenommen. In Gegenwart von Natriumchlorid in Konzentrationen über 0,035 Mol/kg wurde Lochfraß an den passiven Stahlelektroden beobachtet. Er folgt einem kubischen Zeitgesetz.
Abstract Equations describing the sorption kinetics of asymmertric membranes composed of AB and ABC laminate slabs in finite and in semi‐infinite well‐stirred baths are presented, and some properties of these systems are discussed.
The morphology and elemental analyses of calcification occurring in Bacterionema matruchotii were studied by analytical electron microscopy. Early electron densities were found associated with metachromatic granules and cell membranes. Amorphous calcium phosphate appeared before apatite was detected.
Klebelsbergite is verified as a valid mineral species, in museum specimens from the type locality, Baia Sprie (Felscib6nya), Rumania. Klebelsbergite occurs as pale yellow to orange-yellow crystals radially grown on stibnite. Wet-chemical analysis of synthetic klebelsbergite, supported by electron microprobe analyses o…
Abstract The pressure isotherms of the ZrCr2–H system (20–200 °C, 10–700 Torr) and powder X-ray diffraction have shown the occurrence of two phases, cubic ZrCr2Hx (x<1.0) and hexagonal ZrCr2Hx (2.5<x<3.5). From the gradual change in the diffraction pattern with x, it has been concluded that sample…
An Optronics P-1700 film-writing device is used to produce simulations of disordered organic molecular crystals. The simulations may be used directly to obtain optical diffraction patterns for comparison with X-ray diffuse scattering photographs of real crystals. Examples of some substituted anthracenes are given to d…
Abstract The dependency of the mechanical properties (Young's modulus, maximum load, breaking strain, and breaking energy) of polystyrene (PS) and high‐impact polystyrene (HIPS) on the tensile deformation speeds was examined without changing the mode of deformation or the shape of the test specimen. It was found that…
A simple nondestructive method for the quantitative analysis of textile fiber blends has been sug gested. The method requires measurement of moisture regain of the blend and its component fibers. Experimental studies have been made with cotton-viscose, polyester-wool, and cotton-wool blends. For comparison, blends hav…
Out-of-pile experiments were performed with Zircaloy-4 rods in subcooled water environment to study the basic phenomena occurring in the transient cooling process undergone by a fuel rod during a reactivity-initiated accident (RIA) affecting a light water reactor (LWR). The experimental results show that the cooling p…
The crystal structure of the new mineral erdite, NaFeS2.2H2O, has been determined from 263 counter-measured intensity data. The mineral is monoclinic, space group A/c, with a : 10.693(l), D : 9.1l5(l), c : s.507(4)4, B : 92.t7(2), Z : 4, D (X-ray) :2.217 g/cm3. Because of the poor quality of the crystals, the reliabil…
Experiments were performed to study the ratio of permeabilities of protium to tritium through Pd-Ag-Au alloy at the conditions of 350°C≦T≦550°C and p<1,000 mmHg. The observed ratio was 2.12±0.03 at 350°C, and it was almost independent of temperature. It is remarkable that the obtained ratio of permeabilities is consid…
An electron microscopic study has been made on the infection and penetration of the marine diatom Licmophora hyalina Agardh by Ectrogella perforons Petersen, an obligate fungal parasite of diatoms. The zoospores encyst on the host cell wall. The nucleus of the cyst may be situated proximal or distal to the host wall.…
Abstract Die ternären Carbonate LiLn(CO 3 ) 2 mit Ln = La bis Lu einschließlich Y werden aus Gemischen von Li 2 CO 3 und Ln 2 (C 2 O 4 ) 3 · xH 2 O unter CO 2 ‐Drücken von 2000 bar bei 500°C dargestellt. Es werden zwei monokline Strukturtypen beobachtet, diese werden durch IR‐ und Röntgenuntersuchungen sowie durch the…
The formation of magnetite at 310 C on carbon steels has been studied at pH 7.0 and 10.5 in presence of two oxygen levels (&lt;0.05 and 3.5 ppm) by kinetics, scanning electron microscopy, and electrochemical measurements. An adherent and protective magnetite of thickness 1.8 μ was observed after 530 hours of expos…
Dislocation loops formed in high-purity titanium irradiated at 673 K to 3.9 × 1023 neutrons/m2 (> 1 MeV) have been characterized using transmission-electron-microscopy techniques. The loop Burgers vector was of the form 1/2〈1120〉 and loop-normal measurements showed considerable deviation from the pure edge orientation…