Materials Literature
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The effect of mechanical treatment in a planetary ball mill on the transformations of polymorphs of sulfathiazole were studied by means of X-ray diffraction analysis, infrared spectroscopy and differential scanning calorimetry. It has been shown that mechanical treatment initiates transitions of sulfathiazole polymorp…
The feasibility of rapid thermal curing (RTC) of benzocyclobutene (BCB) thin films using an infrared belt furnace is demonstrated. The effects on film properties resulting from a dramatic reduction in cure time (5 h to 5 min) are summarized. The extent of cure was determined by Fourier-transform infrared (FTIR) method…
Shape memory alloys (SMAs) have several unique characteristics, including their Young’s modulus-temperature relations, shape memory effects, and damping characteristics. The Young’s modulus of the high-temperature austenite of SMAs is about three to four times as large as that of low-temperature martensite. Therefore,…
Characteristics of the sintered compacts and the microstructures and electrical properties of Nb‐doped TiO 2 varistors with added Ba and Bi were studied at various sintering temperatures ranging from 1250° to 1400°C. Adding both Ba and Bi to Nb‐doped TiO 2 ceramics resulted in a maximum intergranular phase and a minim…
The significance of memory propagation in controlling the stochastic behavior of partial-discharge phenomena is demonstrated by determination of various conditional amplitude and phase-of-occurrence distributions for both measured and simulated discharge pulses. A system that can be used to measure directly a set of b…
The crystallization rate of liquid silicon has been measured during epitaxial explosive crystallization of amorphous silicon. The measurements, together with numerical temperature calculations indicate that freezing in silicon saturates at 15.8 m/s for large undercooling (>130 K) below the equilibrium melting tempe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and chemisorptive properties of model catalysts: copper supported on silica thin filmsXueping Xu and D. W. GoodmanCite this: J. Phys. Chem. 1993, 97, 3, 683–689Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue…
A model involving the transport of mobile species and film structure relaxation processes is developed for redox switching of permselective electroactive polymer films. Free-energy profiles for such systems show that a variety of pseudo-equilibrium (metastable) states may be populated. The initial polymer film state i…
A magnetic cationic microsphere delivery system, prepared from the polysaccharide chitosan and containing oxantrazole (OX), was examined for its ability to enhance brain delivery of OX compared to administration of OX in solution (OX-S). Magnetic chitosan microspheres containing OX (MCM-OX) and OX-S were administered…
The fracture behaviour of metal/ceramic interfaces is reviewed. It is shown that fracture is a complicated process which depends on many factors such as the geometry of the test specimen and loading conditions, strength of the interfacial bond, thermal, elastic, and fracture properties of the metal and ceramic, thickn…
The paper describes the application of laser triangulation to the grading of fabric pilling. Part II goes further to compare the experimental results with the corresponding gradings as assessed by a panel of experts.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagic angle (54.7.degree.) gradient and minimal surfaces in quadruple micellar helicesJuergen Koening, Christoph Boettcher, Hanspeter Winkler, Elmar Zeitler, Yeshayahu Talmon, and Juergen Hinrich FuhrhopCite this: J. Am. Chem. Soc. 1993, 115, 2, 693–700Publication Date (Prin…
Transformation plasticity in Mg‐PSZ and Y‐TZP ceramics is investigated using a novel stress reversal Hopkinson bar technique recently developed at the University of California–San Diego (UCSD) for dynamic recovery experiments. 1 The longitudinal and transverse strains are measured by strain gauges mounted on the speci…
Abstract The most popular in vitro assay currently used to characterize cell traction forces exerted on extracellular matrix (ECM) fibers is the fibroblast‐populated collagen lattice (FPCL) assay. The compaction of a disk of cell‐populated collagen gel, in terms of rate or extent of diameter reduction, is typically re…
Lithium ion conducting glasses were prepared in the system (0.6Li2S⋅0.4SiS2)-Li3PO4 by twin-roller rapid quenching. The temperatures of glass transition (Tg) and crystallization (Tc) were determined for the glassy samples with 0-40mol% Li3PO4. The conductivity values at 25°C (σ25) were maximized and the activation ene…
Part 1 Accident survey: Introduction, Wind hurricane and tornado generated missiles, Impact and explosion at sea, Car collisions and explosions, Train collisions and impacts, Aircraft and missile impacts, crashes and explosions, Explosions with and without impact, Nuclear explosions and loss-of-coolant accidents, The…
We present 13 C NMR lineshapes and spin lattice relaxation measurements of (TMTTF) 2 Br and (TMTSF) 2 PF 6 in the spin density wave (SDW) state. We confirm that (TMTSF) 2 PF 6 has an incommensurate SDW and show that the phason mode is dominant in the relaxation. We prove that (TMTTF) 2 Br is commensurate and estimate…
Macromolecules
Nanostructural evolution and phase transformation in supported and unsupported titania membranes have been studied using Raman spectroscopy, X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM). Densification of unsupported membranes started at ca. 450 °C and reached more than 97% density a…
The synthetic conditions of amorphous calcium carbonate such as initial concentration of reactant, temperature and pH in the reaction of CaCl2-Na2CO3-NaOH system, and its crystallization in water and NH4Cl solution were investigated. Characteristics of the amorphous phase were determined by means of X-ray diffraction,…