Materials Literature
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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…
The fracture behavior of synthetic diamond has been investigated using indentation methods and by the tensile testing of pre-notched fracture-mechanics type samples. Specifically, the fracture toughness of free-standing diamond plates, grown by chemically-vapor deposited (CVD) methods, was measured using Vickers inden…
Transparent glass ceramics containing β-PbF2:Tm3+ crystallites have been prepared by heat treatment of glasses in GeO2-PbO-PbF2-TmF3 system. Average crystallite size of β-PbF2 evaluated from the full width at half maximum of x-ray diffraction lines varies from about 16 to 20 nm as the heat treatment temperature increa…
The present work examines the inertial effects on void growth in viscoplastic materials which have been largely neglected in analyses of dynamic crack growth and spallation phenomena using existing continuum porous material models. The dynamic void growth in porous materials is investigated by analyzing the finite def…
Reactions of solids exposed to non-isothermal heating reveal diverse isokinetic relationships (IKR). Some of these effects are exclusively inherent to non-isothermal reactions of solids. The present paper briefly surveys the most commonly encountered IKRs, classifying them into two main types: ‘false’ and ‘true’. The…
Raman spectroscopy has been used to investigate the effects of dynamic and postimplantation annealing on glassy carbon implanted with 50 keV C ions to a dose of 5×1016 ions/cm2. The postimplantation annealing of damage in the ion-beam modified material was found to occur in two stages as a function of postimplantation…
Fabrication methods and property characterization of polyglycolic acid (PGA), polylactic acid (PLA), and their copolymers are reviewed. Both of these aliphatic polyesters belong to the a-hydroxy group and biodegrade in a physiological environment to monomeric acids, which are readily processed and excreted from the bo…