Materials Literature
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Surface segregation of In atoms during molecular beam epitaxy (MBE) and its influence on the energy levels in InGaAs/GaAs quantum wells (QWs) were systematically studied using secondary-ion mass spectroscopy (SIMS) and photoluminescence (PL). Strong dependence of In surface segregation on the growth conditions was fou…
Increased molecular weight and branching agents are used in melt spinning partially oriented nylon 66. The fiber solidifies more rapidly during spinning and has larger crystallites and increased elongation-to-break versus conventional PON, consistent with a stress-induced crystallization mechanism. When textured, the…
Lead scandium tantalate (PST) ceramic has been shown [1,2] to be a ferroelectric material with the perovskite Pb(B1B2)O3 structure, and having a first order phase transition at 25–30°C. The material has a reversible pyroelectric effect under bias, and it has been fully assessed for thermal detector applications [3]. M…
Abstract Einkristalle von Cu 6 La 4 Mo 9 O 36 wurden synthetisiert und röntgenographisch untersucht. Es kristallisiert trigonal, Raumgruppe R3c — C ; a = 20,892, c = 12,754 Å; Z = 6. Cu 6 La 4 Mo 9 O 36 repräsentiert einen neuen Strukturtyp mit isolierten MoO 4 ‐Tetraedern und dreifach überkappten trigonalen Prismen u…
The importance of D-3He reactor development in the attainment of attractive fusion energy is discussed. In addition to D-3He plasma physics and confinement issues, the use of low-activation wall materials and commercial production of 3He are vital issues for the successful achievement of a D-3He energy economy. These…
Corrosion behavior of SUS-304L SS, which is used as a typical material for reactor structures has been studied under the steam containing CsOH at temperatures of 450~750°C. The steam was supplied by heating the aqueous solution of CsOH with concentrations 0~320 mM at 110°C. The mass gain by oxygen uptake increases par…
The theory of the climb mobility of a dislocation connected to an array of bubbles or voids is developed. When climb occurs by lattice diffusion, the most important feature is the resolved force exerted by the dislocation on the bubble or void. The climb velocity may then be controlled by bubble or void drag under cer…
Crystalline silicon nitride (Si3N4) is of considerable interest commercially, e.g., as a passivating layer in the microelectronics industry and in the construction of advanced heat engines. The high-temperature, nitriding processes normally used in the manufacture of this ceramic yield materials in which the ratio of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of two-photon-excited xenon and krypton atoms with hydrogen moleculesM. Kawasaki, Y. Matsumi, A. Chattopadhyay, N. Shafer, S. Satyapal, S. Tasaki, W. Yi, and R. BersohnCite this: J. Phys. Chem. 1992, 96, 17, 7010–7013Publication Date (Print):August 1, 1992Publicatio…
Abstract The large deformation elastic response of a plane woven Kevlar fabric is investigated analytically and experimentally. The analysis assumes the undeformed geometry to be a sequence of interlaced arcs of circles that reverse at each yarn midpoint, and each yarn is modeled as an extensible elastica subject to c…
The complete lyc gene encoding the autolytic lysozyme of Clostridium acetobutylicum ATCC 824 was reconstructed from two overlapping DNA fragments and cloned into a suitable plasmid enabling Escherichia coli to produce this lytic enzyme under the control of the lac promoter. A polypeptide with an apparent M(r) of 35,00…
Abstract The longitudinal penetration of micromolecular liquid solvents (acetone, dioxane) or swelling agents (methylene chloride, methanol) into unoriented (unstretched) cellulose acetate film has been studied in detail by a variety of techniques, including observation of visible penetrant fronts, birefringence profi…
The aim of the present work was to identify the structural characteristics of calcium chromium oxide formed at molar ratios CaO/Cr 2 O 3 ≥ 3/1 and at elevated temperatures by the use of nondestructive techniques: instrumental neutron activation analysis (for determination of the total chromium content), electron param…
Low‐thermal‐expansion ceramics having arbitrary thermal expansion coefficients were synthesized from homogeneous solid solutions in the system KZr 2 (PO 4 ) 3 ─KTi 2 (PO 4 ) 3 (KZP–KTP). Dense and strong ceramics were fabricated by sintering at 1100° to 1200°C with 2 wt% MgO. The thermal expansion coefficient increase…
The chemical and mineralogical composition of the clay fractions of two Paleudults from Central Kalimantan, Indonesia have been investigated. The dominant phyllosilicate in both profiles is poorly crystalline kaolinite. Both profiles contain small amounts of an irregular interstratified hydroxy-interlayered illitic ve…
Processing of cellular polyurethane was investigated experimentally and theoretically to examine the possibility of ultrasonic foaming. Polyol resin was supersaturated with nitrogen and ultrasonic excitation was applied for copious bubble nucleation. The ultrasonic excitation resulted in good foam structure whose size…
Thermal oxidation of blends of polystyrene and poly(vinyl methyl ether) containing a hindered phenol as antioxidant was studied at 110°C. The incorporation of the antioxidant in the miscible blend lengthens the induction period and lowers the rate of oxidation. Phase separation which preceded the end of the induction…
Lead titanate and lead magnesium niobate ceramics are fabricated from powders prepared by hydrothermal synthesis. The results of powder and ceramic characterisation are presented and compared with similar data obtained for ceramics fabrication by conventional mixed oxides.
Well-separated magnetic particles (∼1 μm size) of Nd2Fe14B alloy are successfully crystallized using an oxygen-reduction-diffusion process. In this process suitable mixtures of Nd2O3, Fe, and B precursor powders were sintered (at 900–1000 °C for 1–3 h) with finely dispersed calcium granules (reducing agent) and anhydr…
Abstract An experimental procedure has been developed to assess the various components of the mixing energy when preparing carbon black filled rubber compounds. A microprocessor based instrument developed for laboratory mixers allows the measurement and recording of all the relevant parameters of the operation, which…