Materials Literature
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The electrostatic discharge between a clothed human body and the ground has been investigated under conditions of low atmospheric humidities. Measurements were carried out during two experiments which generated electrostatic charge from two different types of human activity. Subjects wore layered garment systems consi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Novel Thermally Stable PolypyrazolesJ. A. Moore and Parag G. MehtaCite this: Macromolecules 1995, 28, 2, 444–453Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 1995https://pub…
Porphycene, a structural isomer of porphyrin, reacts with the Vilsmeier reagent (DMF–POCl3) to give a one-carbon bridge between two pyrrolic nitrogens; this new structure is characterized by NMR and X-ray crystallography.
Control of NOXemissions from combustion sources has become an important issue in recent years, particularly in the ozone nonattainment areas of California. Cement kilns represent an important source of NOXemissions, and they either have already been regulated or are being considered for future regulations. The develop…
Grain texture and magnetic properties of ultra thin silicon steel sheets were investigated. The sheets were produced using two kinds of starting materials. One was conventional grain oriented silicon steel sheet and the other was hot rolled silicon steel. Ultra thin sheets were obtained by cold rolling with intermedia…
γ-Hydroperoxy-α,β-unsaturated carbonyl compounds are prepared in good yields by the regioselective hydroperoxygenation of α,β,γ,δ-unsaturated carbonyl compounds with molecular oxygen and triethylsilane in the presence of cobalt(II) porphyrin as a catalyst.
Abstract High quality AgGaSe 2 single crystals with 20 mm in diameter and 55 mm in length have been grown by Bridgman technique. It is found that there is a second phase of Ag‐rich Ga 2 Se 3 (or named AgGa 7 Se 11 ) in the AgGaSe 2 crystal. It is concluded by discussions with the DTA results and the phase diagram that…
Several pharmacological activities have been observed in pectic polysaccharides which were isolated from Chinese herbs containing Kampo medicines. We found two different bioactive pectic polysaccharides, bupleuran 2IIb and 2IIc, from the roots of Bupleurum falcatum. These bioactive pectic polysaccharides were comprise…
The symmetrically octafluorinated 1,2-bis(2,3,5,6,-tetrafluoro-4-n-alkoxyphenyl)acetylene (n= 7–9) monomers and symmetrically octafluorinated 1,4-bis[(2,3,5,6-tetrafluoro-4-n-alkoxyphenyl)ethynyl]benzene (n= 3–9, 12) dimers have been prepared by a Pd-catalysed coupling reaction from the starting material, 1-pentafluor…
The susceptibility to hydrogen induced cracking under applied stress was examined for a large diameter high strength sour service line pipe steel produced by employing the thermo-mechanical control process, i.e. controlled rolling followed by accelerated cooling. The low carbon content aimed at high toughness and weld…
Abstract Polystyrene with different degrees of sulfonation was empolyed as a polymeric dopant for polyaniline. The purpose of using a polymeric dopant is to avoid the migration of a small molecule dopant to increase stability of the doped complex. We applied the polymeric dopant to polyaniline in three different ways:…
Glass ceramics of the composition Li 2 O · 2SiO 2 .were prepared with an oriented microstructure. The oriented crystalline phase is orthorhombic lithium disilicate. This orientation was achieved by crystallization of glass fibers and bulk glasses in a temperature gradient and under isothermal conditions. Both bulk and…
The molecular dynamics simulation of fracture process under static and fatigue loading were done on a nano-scale polycrystal of pure iron, proposed in a previous paper. In the static tension, increasing tensile strain promoted the slip band formation near the grain boundary and finally resulted in microcrack initiatio…
Molecular dynamics simulations have been performed to study the dynamical properties of amorphous and liquid Zr67Ni33 alloys. The atomistic vibrational dynamics consist of single-particle motion and cooperative motion. The former is analyzed by the power spectrum of velocity autocorrelation function, the latter by the…
The complexes fac-[PtMe3(L–L)(pydz)][BF4](L–L = neutral bidentate chelate ligand; pydz = pyridazine) were readily prepared from fac-[PtlMe3(L–L)] by the action of silver(I) salts in the presence of an excess of pyridazine. Pyridazine is acting as a monodentate ligand, which undergoes a facile 1,2-metallotropic shift b…
A series of cyclic tri- and tetra-metric phosphazenes [NP(OR)2]n(n= 3 or 4), N3P3(OR)Cl5 and N3P3(OR)4Cl2 has been prepared with 1- or 2-naphthyloxy, 1-naphthylmethyloxy, 1-naphthylethyloxy, 9-anthryloxy and 9-phenanthryloxy side groups OR. These syntheses are model processes for the preparation of the corresponding p…
Inhibiting action of semicarbazide, thiosemicarbazide, sym. diphenylcarbazide towards corrosion of zinc in hydrochloric acid has been investigated. The rate of corrosion depends on the nature of the inhibitor and its concentration. The values of inhibition efficiency from, weight loss, thermometric measurements are in…
&&Q& The aim of this paper is to provide an overview of important developments in the chemistry and the use of persistent free bi-and polyradicals to study chemical and biological model systems by electron paramagnetic resonance (epr) or as materials for physical purposes.The paper also discusses the different ways us…
Molecular orientations and surface morphology of mechanically rubbed polyimide films have been extensively studied by FT-IR, ellipsometry and atomic force microscope. In-plane and out-of-plane molecular orientations of rubbed polyimide films have been examined by angular dependences of polarized infrared transmission…
High quality graphite films have been prepared from carbonized aromatic polyimide films by short time heat treatment at 3100 and 3200°C without any pressurization. The starting materials were Kapton and Novax with 25μm thick and a high-modulus polyimide film (PPT), prepared via polyamic acid gel, with 45μ thick. Micro…