Materials Literature
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Instead of the classic Fourier equation based on diffusion, a hyperbolic equation based on a wave model has been used to predict the rapid transient heat conduction in IC chips. The peak temperature, spatial difference, and time variation of temperature, which are critical to thermal reliability of the chip, are given…
A new theoretical approach for the prediction of the growth habit of crystals is presented. This approach is based on a newly derived relation between the growth rate of crystal surfaces and habit-controlling factors, and includes a key step: a so-called interface structure (IS) analysis. This analysis is to formulate…
A shift of the intrinsic conductivity minimum of strontium titanate ceramics, which depends on the oxygen partial pressure of the sintering atmospheres, was observed. Different hydrogen partial pressures (at constant oxygen partial pressures) did not affect the minimum position. A comparison of the results with defect…
The twisting power of chiral probes in nematics is interpreted in terms of a shape model, in which the surface elements of the solute molecules tend to align with the local director. The theoretical treatment is based on a previous approach, suitable for relating order parameters in nematics to molecular shape, and le…
Abstract The capacity of soil organic matter (SOM) to reduce K fixation was investigated in calcareous vermiculitic soils. Humic acid fractions were extracted with the use of a modification of the standard NaOH extraction procedure. The mobile humic acid pool (MHA) was extracted without initial decalcification. Additi…
Abstract A model dissolution/reprecipitation process is studied for the recycling of high‐density polyethylene (HDPE). The process proposed basically comprises dissolution of the plastic in an appropriate solvent, reprecipitation by using a nonsolvent, thorough washing of the material obtained, and drying. The solvent…
Negative substrate-bias effects on diamond heteroepitaxial nucleation have been investigated using microwave plasma-assisted chemical vapor deposition. The density and the percentage of azimuthally ordered particles grown on carburized Si(001) or on high-quality β-SiC(001) have been estimated by varying the bias-treat…
SPECTRA® polyethylene fibers are rapidly gaining acceptance in many applications in which high strength and modulus are required. They also represent a breakthrough in fiber technology because they represent the first case of a successful conversion of a flexible polymer into an ultra-strong fiber. Until the work of P…
The general formula of a phase relation between well-known bismuth layer-structured ferroelectrics (BLSF) such as Bi 3 TiNbO 9 , Na 0.5 Bi 2.5 Nb 2 O 9 , Bi 4 Ti 3 O 12 , and Na 0.5 Bi 4.5 Ti 4 O 15 including perovskite compounds (Bi 0.5 Na 0.5 ) TiO 3 and NaNbO 3 , that is, Na ( m -3+ x )/2 Bi ( m +5- x )/2 Ti m - x…
The crystal structure of the unliganded alkaline protease from Pseudomonas aeruginosa IFO3080 has been determined at 2.0 A resolution by the X-ray method. The enzyme consists of N-terminal catalytic and C-terminal beta-helix domains. On structural comparison between the present unliganded enzyme and structurally- know…
The purpose of this study was to evaluate efficacy and safety of a gadolinium (Gd) zeolite suspension as an oral MRI contrast agent. Serial dilutions of GADO-LITE Oral Suspension 1,2-300 micrograms of Gd(III)/mL) were prepared. MRI (T1 and T2 weighted) of standards and dogs (precontrast and postcontrast) were performe…
RNA polymerase from Bacillus subtilis is a complex mixture comprising a common core (beta beta' alpha 2), the 20.4 kDa delta (delta) protein, and of one of several sigma (sigma) specificity factors. The delta protein, together with several truncated variants, has been overproduced and purified from Escherichia coli. I…
General theory general methods of solution for fundamental problems methods of solution for various particular problems problems with compound boundary conditions fundamental crack problems fundamental crack problems of composite materials on the uniqueness theorems for fundamental problems.
Summary In an acid soil, amounts or organic carbon resistant to peroxidation with hydrogen peroxide were strongly related to the proportions of expandable phyllosilicate (vermiculite, smectite) in the clay fraction, as measured by its K 2 O content and cation exchange capacity. This was taken to indicate that a substa…
Abstract In this work a model, composed of the nonlinear Cahn‐Hilliard and Flory‐Huggins theories, is used to numerically simulate the phase separation and pattern formation phenomena of oligomer and polymer solutions when quenched into the unstable region of their binary phase diagrams. This model takes into account…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-State 13C-NMR Investigation of the Disorder in Crystalline Syndiotactic PolypropyleneFinizia Auriemma, Ralf Born, Hans Wolfgang Spiess, Claudio De Rosa, and Paolo CorradiniCite this: Macromolecules 1995, 28, 20, 6902–6910Publication Date (Print):September 1, 1995Public…
Lattice parameters of RE 4 Al 2 O 9 (RE = Y, Sin, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb) prepared at 1600–1800°C and those of RE 4 Ga 2 O 9 (RE = La, Pr, Nd, Sm, Eu, and Gd) prepared at 1400–1600°C were refined by Rietveld analysis for the X‐ray powder diffraction patterns. The parameters increased linearly with the ioni…
Abstract 1926 synthetisierten Hans Fischer und Bruno Walach die ersten Porphyrine [1] . Derzeit erscheinen jährlich mehr als 1400 neue Veröffentlichungen über Synthesen und Anwendungen von Porphyrinen [2] . Das damit dokumentierte große Interesse an diesen Verbindungen steht in einem Mißverhältnis zu deren Verfügbarke…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and doping of zinc oxide using spray pyrolysisJulie De Merchant and Michael CociveraCite this: Chem. Mater. 1995, 7, 9, 1742–1749Publication Date (Print):September 1, 1995Publication History Published online1 May 2002Published inissue 1 September 1995https://pubs…
Abstract Specific surface area is an important property for carbon black grade classification, production control, and prediction of rubber reinforcement characteristics. Total surface area alone is insufficient for estimating the reinforcing properties of a microporous carbon black because the internal area of the mi…