Materials Literature
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The self-heating of Si devices operating in the 4 K<T<300 K range is discussed in this work. The temperature-dependent thermal time constant of a typical Si chip is calculated and compared to several electrical relaxation times. Thermal events may be indistinguishable from electrical events at low temperatures, and th…
The reaction of hexakis(2,4,6-triisopropylphenyl)tetrasilabuta-1,3-diene R2Si=SiR–SiR=SiR2 (1) with atmospheric oxygen furnishes the oxidation product R2Si(O)2SiROSiR(O)2SiR2 (5) by oxygen insertion into all Si–Si bonds. However, treatment of 1 with meta-chloroperoxobenzoic acid provides R2Si(O)2SiR–SiR(O)2SiR2 (7) wi…
Previous studies have identified four cis-response elements which mediate the basal transcriptional activity of the human alpha2(I) collagen gene. One of these elements, a pyrimidine-rich region (TCCCCC motif), was shown to be a repressor site, and the other three elements were shown to be activator sites. Furthermore…
Mn K-edge fluorescence data are presented for thin-film samples $(3000\AA{})$ of colossal magnetoresistive (CMR) ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}:$ as deposited, and post annealed at 1000 and 1200 K. The local distortion is analyzed in terms of three contributions: static, phonon, and an ext…
Our studies of compressively strained La0.7Sr0.3MnO7 (LSMO) thin films reveal the importance of domain structure and strain effects in the magnetization reversal and magnetotransport. Normal and grazing incidence x-ray diffraction indicate that the compressive strain on these LSMO thin films on (100) LaAlO3 is not com…
Giant magnetostriction (GMS) reported until now in exchange-coupled multilayers (ECML) present quasi-isotropic magnetostrictive behavior. In the present work it is shown the possibility to induce highly anisotropic GMS at low field with the single domain state in (TbFe/Fe)n multilayers when deposited by ion sputtering…
Two types of textured, fully dense NdFeB hydrogenation, disproportionation, desorption, and recombination (HDDR) magnets were produced. The first type was produced by hot pressing isotropic HDDR powder followed by die upsetting; the second, by hot pressing prealigned, anisotropic HDDR powder (MQA-T). Studies of the ma…
Der Inninger Bach stellt den Abfluss des Wörthsees (Bayern) dar. Im Verlauf des kalkreichen Gewässers wurde die Makrophytenvegetation kartiert sowie Messungen der Nährstoffkonzentrationen im freien Wasserkörper und im Sediment durchgeführt. In jedem Kartierabschnitt wurde der Makrophytenindex für Fließgewässer (TIM) b…
Barium ferrite thin films with perpendicular c-axis orientation and small grain size (about 300 Å) were successfully fabricated with careful control of sputtering conditions. The c-axis orientation of barium ferrite thin films is most sensitive to the oxygen partial pressure during deposition. All samples with oxygen…
Lamellar crystals of the monodisperse 10-amide nylon 6 oligomer were prepared from solution. The crystal structure and morphology were studied using electron microscopy (diffraction and imaging) from individual lamella and X-ray diffraction data from sedimented oriented mats. The lamellar stacking periodicity (LSP) wa…
The growth of spherulites of poly(ethylene oxide) in blends with poly(hydroxyether of bisphenol A) was investigated. In a very narrow range of crystallization temperatures, the spherulite growth deviates from the usual constant growth rate regime in a systematic manner in which the growth rate decreases with time. Thi…
Abstract We propose a novel wide‐view polarizer with extremely low light leakage in all directions. This wide‐view polarizer has advantage of high achromaticity. By applying this polarizer to the IPS mode and the R‐OCB mode, we have confirmed to obtain excellent wide viewing angle in its black state.
Tilted smectic phases of achiral banana-shaped molecules are polar and may form a number of different states (chiral or racemic, antiferroelectric or ferroelectric), which can be interchanged by external fields. In thin films they may assume various layer structures (vertical, tilted or horizontally modulated), which…
The fire retardant action of red phosphorus in nylon 6 was im proved by co-addition of ferric/ferrous oxides. It was found that the activity of Fe oxides depends on the product grade. Polymer formulations, non-ignitable in air were obtained by co-addition of Fe 3 O 4 /Fe 2 O 3 = 3:2 with red phosphorus. Scanning elect…
Within the wealth of hydrocarbon polymers, poly(p-phenylene alkylene)s (“alkarotics”) hold a special position since they have been a long forgotten class of hydrophobic polymers. This is somewhat surprising, since the cornerstones of this polymer family cover extremely broad materials properties and the few known repr…
Crystal structures of the compounds Ca 9 R (VO 4 ) 7 ( R = Tb ( I ), Dy ( II ), Ho ( III ), and Y ( IV ) have been studied by the method of the full-profile analysis. All the compounds are crystallized in the trigonal system (sp. gr. R 3 c , Z = 6) with the unit-cell parameters ( I ) a = 10.8592(1), c = 38.035(1), V =…
Measurements of the chirality (2 pi/pitch) in the chiral nematic phase and of a structural constant proportional to the chirality in the isotropic liquid for a system in which a helix inversion line crosses the chiral nematic to isotropic phase transition line are reported. While the chirality shows a strong temperatu…
Summary Many horizontal wells produce both oil and brine for an extended period of time and, therefore, in many cases the problem of mineral scale deposition must be solved. Scale management in long horizontal wells faces several challenges, a major one being the correct placement of the scale inhibitor slug in the fo…
The hydration state of a series of [Ln(DO2A)(H2O)n]+ complexes in aqueous solution at pH = 6.4–7.0 was studied by measuring the lanthanide-induced 17O shifts (LIS) of water [Ln includes elements from Ce to Yb; DO2A = 1,7-bis(carboxymethyl)-1,4,7,10-tetraazacyclododecane]. Their contact contribution, obtained from Reil…
New homo- and heterometallic hexanuclear complexes of formula {[Cu(tmen)(H2O)]2[Cu(tmen)]2[Cu2L](H2O)}(ClO4)4 · 2 H2O [Cu6-tmen] {[Cu(pmdien)]4[Cu2L]}(ClO4)4 · 4 H2O [Cu6-pmdien] and {[Ni(cyclam)]4[Cu2L]}(ClO4)4 · 4 H2O [Cu2Ni4-cyclam] [H8L = tetrakis(aminomethylene)methanetetrakis(oxamic acid), tmen = N,N,N′,N′-tetra…