Materials Literature
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The Cahn-Hilliard equation, which is important in the context of first-order phase transition, has frequently been studied in its simplified form, <disp-formula content-type="math/mathml"> \[ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="c Subscript t Baseline equals normal upper Delta left-bracket…
Abstract The weathering of a trachytic pumice within a pyroclastic flow underlying an andic-brown soil on the volcano Vico has been studied. The main mineral formed is a spherical 10 Å halloysite which has been shown by SEM and in situ microprobe analysis to have formed directly from the glass. The major mineralogical…
Deterministic methods studying the losses due to the motion of single Bloch walls or of well defined domain structures yield equations of limited accuracy, which only provide some hints as to the trend of power losses in different materials. These results are compared with the ones obtained through a recently develope…
LiAsF 6 is the current state‐of‐the‐art lithium salt for use in many prototype rechargeable systems. The instability and potential toxicity of LiAsF 6 has led to the search for new lithium salts. To this end, we investigated the electrochemical stability of LiSbF 6 and LiPF 6 in aprotic organic solvents. Electrochemic…
Abstract Oxygen reduction performances of gas-diffusion type carbon electrodes loaded with perovskite-type oxides La1−xCaxMO3 (M=Co,Mn) were examined in 30 wt% KOH at 25 °C. The highest electrode performance, i.e., 2600 mA/cm2 at −125 mV vs. Hg/HgO, was obtained with large surface area La0.6Ca0.4CoO3 prepared by an am…
Large semiconductor chips generate greater heat. Therefore, heat dissipation has become a serious problem. To dissipate heat from semiconductor chips, a new type of substrate material is needed. A new generation of SiC ceramics has been developed which is suitable as substrate materials for Si semiconductors.
Cotton, polyester, and a blend in plain woven, pure finish fabrics were studied to determine their influence on dynamic surface wetness and moisture transfer through textiles. A simulated sweating skin was used, over which were placed test fabrics incorporating a clothing hygrometer to continuously measure dynamic sur…
Even under conditions of protective oxidation, significant structural changes can develop in the metal substrate. One observation frequently reported is that of subsurface cavitation, but it is not likely that the same physical processes always apply. In some cases, vacancy injection by the removal of cations and subs…
Abstract The observation of a novel phenomenon is reported whereby the processing history of a nylon 6 leads to a memory effect which in turn affects its crystallization rate from the molten state. Differential scanning calorimetry (DSC) and optical microscopy are the primary techniques used to demonstrate that the me…
The microbial polymer poly-3-hydroxybutyrate (PHB) and related poly-hydroxyalkanoates, such as poly-3-hydroxyvalerate and poly-3-hydroxyoctanoate, are unique biodegradable thermoplastics of considerable commercial importance. The structure, properties and regulation of synthesis and degradation of PHB are reviewed and…
Two types of permanent magnetic materials were obtained by annealing melt spun flakes : (i) materials consisting mainly of Fe3B with Nd2Fe14B as a secondary phase, and (ii) materials based on Nd2Fe14C. The methods of preparation and the resulting magnetic properties are presented.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen atom tunneling in the thermal tautomerism of porphine imbedded in a n-hexane matrixThomas J. Butenhoff and C. Bradley. MooreCite this: J. Am. Chem. Soc. 1988, 110, 25, 8336–8341Publication Date (Print):December 1, 1988Publication History Published online1 May 2002Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogenolysis of ethane, propane, n-butane, and neopentane on the (111) and (110)-(1.times.2) surfaces of iridiumJ. R. Engstrom, D. W. Goodman, and W. H. WeinbergCite this: J. Am. Chem. Soc. 1988, 110, 25, 8305–8319Publication Date (Print):December 1, 1988Publication Histor…
Relaxation processes of excited copper porphyrins were studied with relevance to the structure of the substates of the lowest excited states. Lifetimes of luminescence at room temperature were determined as 17, 29, 69, and 105 ns for T(EtO)PPCu [T(EtO) PP: 5, 10, 15, 20-tetra (p-ethoxyphenyl)porphin], TPPCu(TPP: 5, 10…
Blue Phases remained up to very recent years quite mysterious. First observations were done at the end of the last century by Reinitzer in 1888 and by Lehmann in 1906. The precise nature of these phases was a puzzling problem. At present it is firmly established that they are real phases and not textures of other phas…
We obtain, using large deviations principles, full asymptotic expansions of functionals of Laplace type on Wiener space for general (i.e. degenerate) diffusions extending the results of Schilder [12], Azencott [2] and Doss [7, 20]. The variational hypothesis (non degeneracy of the minima) used here is shown to be opti…
Abstract Three different methods to synthesize star‐shaped poly(ethylene oxide) are discussed in the present article. In all three cases, the branches are grown from a plurifunctional initiator. It is established that even though the early stages of the polymerization occur in heterogeneous phase, the consequences on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChronoamperometry of polypyrrole: migration of counterions and effect of uncompensated solution resistanceChris D. Paulse and Peter G. PickupCite this: J. Phys. Chem. 1988, 92, 24, 7002–7006Publication Date (Print):December 1, 1988Publication History Published online1 May 20…
The effect of particle size distribution on the sintering of Al 2 O 3 was investigated. Samples could be sintered to high relative density (∼99%), small average grain size (1 μm), and no growth of exaggerated grains using powders with either broad or narrow particle size distribution. However, the broad particle size…
Collagen IV dimers of two collagen IV molecules connected by their C-terminal globular NC1 domains were isolated by limited digestion with bacterial collagenase from mouse Engelbreth-Holm-Swarm (EHS) sarcoma tissue. The collagenous domains were only 300 nm long as compared to 400 nm of intact collagen IV but the disul…