Materials Literature
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ABSTRACT Thermal polymerization and mechanical degradation rates were measured for wheat gluten and glutenin at 25–30% moisture. Changes in soluble protein and disulfide bonds were measured at 85°C to 180°C, residence times of 2–60 set and shear rates of 10–275 sec ‐l . Polyrnerization rates without shear were evaluat…
This communication demonstrates a strong, room-temperature (RT), infrared (IR) (1.54 μm) emission from Er-implanted red-emitting (peaked at 1.9 eV) porous silicon (Er:PSi). Erbium was implanted into porous Si, bulk Si, and quartz with a dose of 1015/cm2 at 190 keV and annealed for 30 minutes in N2 at temperatures rang…
The chemisorption of coadsorbed CO and NO has been studied over Pd(111) and Pd(100) at 1×10−6 Torr using infrared reflection absorption spectroscopy. At a pressure ratio of PNO/PCO= 1, the ratio of adsorbed NO to adsorbed CO, [NOa]/[COa], increased with temperature over both single crystal surfaces. Furthermore, the […
The microgenetic algorithm is utilized in the design of dielectric grating structures. To our knowledge, this is the first time that a genetic algorithm has been demonstrated with a small population size, a mixed variable type, and an adaptive mutation scheme. A wide range of grating devices is optimized with the micr…
The effects of strain on the zone-center TO phonon frequencies of cubic BN (and, hence, the positions of the infrared-absorption peaks) are calculated using an ab initio pseudopotential linear-combination-of-atomic-orbitals method. The calculated phonon wave number for the unstrained material is 1063 ${\mathrm{cm}}^{\…
The pitting and polarization characteristics of low-index surfaces of zinc (Zn) monocrystals were studied in weakly alkaline (pH 9.2) solutions containing 0.1 M sodium chloride (NaCl), using single-cycle potentiodynamic polarization tests and a scan rate of 0.5 mV/s. Tests were conducted in the presence and absence of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-State Synthesis and Morphology of Poly(ferrocenyldimethylsilane)J. Rasburn, R. Petersen, R Jahr, R. Rulkens, I. Manners, and G. J. VancsoCite this: Chem. Mater. 1995, 7, 5, 871–877Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Publish…
Photoluminescence of erbium-implanted porous silicon is investigated. Room temperature 1.54 μm Er3+ luminescence is observed after annealing. The luminescence spectrum, annealing characteristics, temperature quenching, and the luminescence lifetime suggest that the Er3+ luminescence is mediated by photocarriers in the…
The TATA-binding protein (TBP) plays a key role in transcription initiation. Several negative cofactors (NC1, NC2, and Dr1) are known to interact with TBP in a manner that prevents productive interactions of transcription factors TFIIA and TFIIB with promoter-bound TBP. To gain insights into the regulatory interplay o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of Molecular Weight Distributions of Polymers by MALDI-FTMSMichael. Dey, John A. Castoro, and Charles L. WilkinsCite this: Anal. Chem. 1995, 67, 9, 1575–1579Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBoron-Modified MCM-41 Mesoporous Molecular SievesAbdelhamid Sayari, Chistophe Danumah, and Igor L. MoudrakovskiCite this: Chem. Mater. 1995, 7, 5, 813–815Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 May 1995https://pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Half-Open Cage-Shaped Cluster, (NEt4)3[WOS3(CuBr)3(.mu.2-Br)].cntdot.2H2O: Synthesis, Structure, and Nonlinear Optical PropertiesZ. R. Chen, H. W. Hou, X. Q. Xin, K. B. Yu, and S. ShiCite this: J. Phys. Chem. 1995, 99, 21, 8717–8721Publication Date (Print):May 1, 1995Publi…
Abstract The possibility of reacting furfuryl alcohol with the p ‐position of phenolic rings, under acid conditions, was proved using different experimental techniques: size exclusion chromatography, Fourier transform infrared spectroscopy and 13 C NMR. This reaction was then used in the modification of phenolic novol…
Abstract Degradation of insulation systems by partial discharges (PD) is well known. Although measuring systems are used to classify PD activity, only little information is available about the relationship between PD energy and degradation. Internal PD‐ respectively gas‐discharge processes in spherical voids are calcu…
Abstract The polymer‐modified surface of kaolin was studied to determine the effect of changing the molecular weight of the polymer chain grafted on the surface. The particle was modified by attaching poly(ethylene oxide) to the surface using a urethane linkage. Upper critical flocculation temperature and contact angl…
Abstract Polytetrahydrofuran diols are polyurethane precursors obtainable from carbohydrate feedstocks. A range of commercial diols of different molecular weights were selected and supplemented by synthesised diols of lower molecular weights. To increase the carbohydrate content of derived polymers each diol was react…
The author explains how the ohmic behaviour of a bundle of conductors can be characterized by a complex resistivity. He provides an analytical expression, explicit and simple, of that resistivity and shows how to optimize an HF transformer, using that formula together with a previously published expression of the macr…
The aim of this work is to carry out a two-dimensional, non-linear, time-stepped finite-element simulation of a symmetrical short-circuit in a synchronous machine. Computed results of currents and rotorical torque are presented as comparison between computed reactances and test values.>
When a circuit containing a transformer is to be simulated, one must know the coupling coefficient or equivalent leakage inductances in addition to the other transformer properties. When other inductances in series with a transformer winding are large compared to the leakage inductance the leakage inductance may be ne…
Crystalline β‐Ta 2 O 5 coatings were deposited on hot‐isostatically‐pressed Si 3 N 4 by reacting TaCl 5 with H 2 and CO 2 in the temperature range of 1000°–1300°C and at a pressure of 660 Pa. The Ta 2 O 5 coatings generally consisted of wellcoalesced 2–3 μm grains, resulting in the formation of a nonporous coating mor…