Materials Literature
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An accurate knowledge of electron stopping power is important for calculations and simulations of electron beam interactions with solids especially in the low energy region (< 10 keV). This paper describes a simplified and rapid experimental procedure using based on electron energy loss spectroscopy which permits accu…
Abstract The addition of β‐cyclodextrin to a solution containing β‐benzyloxy‐α‐propionic‐substituted DOTA‐ and DTPA‐Gd(III) complexes leads to the formation of inclusion compounds whose equilibrium constants have been determined by NMR titrations. The main effect associated with the formation of this ‘host‐uest’ inter…
Abstract The lack of polar groups in thermoplastics (e.g., in polystyrene) provides low adhesion with cellulosic fibers. To improve compatibility between reinforcement and matrix, maleic anhydride (MA) was selected as a coupling agent for wood fiber‐filled polystyrene composites. In general, the mechanical properties…
Abstract A mathematical model is developed to describe the dynamic and pseudosteadystate behavior of chemical vapor infiltration, a process used to fabricate fiber‐reinforced ceramic matrix composites. The three‐parameter dusty‐gas model is used to describe the interaction of mass transport fluxes, partial pressures,…
Mineralogical data, thermodynamic stability (Pourbaix) diagrams, and the simplexity principle for precipitation reactions were used to evaluate corrosion product mineralogy on copper alloys exposed to sulfate-reducing bacteria. The formation of copper sulfides as corrosion products in natural surface environments is s…
Abstract Strongly held carbonates anions in the interlayer region of pyroaurite-type compounds, [ Ml II 1− x M2 III x (OH) 2 ] x + [(CO 3 ) x /2 y H 2 O] x − ( x = 0·15−0·44), can be relatively easily exchanged by other anions such as NO 3 − , Cl − or SO 4 2− dissolved in heated glycerol. Some Fe(III) of pyroaurite is…
Measurements of discharging current transients in pentyl cyanobiphenyl liquid crystals have been made at various applied voltages and temperatures. A well-characterized peak in the discharging transient is observed in both nematic and isotropic phase. A computer simulation based upon a random-walk method has been also…
A Fabry-Perot-type interferometer is described that permits the concurrent measurement of the coefficient of thermal expansion (alpha) and the thermooptic coefficient (dn/dT) of transparent materials. Measurements of the a and the dn/dT of vitreous silica and a heavy-metal fluoride glass show that the technique is acc…
The fate of the alpha-hydrogen of mandelate in the reaction catalyzed by mandelate racemase has been investigated by a mass spectroscopic method. The method entails the incubation of (R)- or (S)-[alpha-1H]mandelate in buffered D2O to a low extent of turnover (about 5-8%), esterification of the resulting mixture of man…
In a study of yam strength translation into woven fabric behavior, experiments were conducted to establish the effect of test gauge length on yarn properties. Yams produced on each of the three major spinning systems were tensile tested at varying gauge lengths. Yam strength data were fit to two-parameter Weibull dist…
Systemic administration of luteinizing hormone-releasing hormone (LHRH) in rats has been found to influence behavior independently of pituitary or ovarian function. A previous study has shown that LHRH can cross the blood-brain barrier in one direction, but it was not known whether this was due to a saturable transpor…
Charge‐discharge characteristics of electrochemically prepared V 2 O 5 ( e ‐ V 2 O 5 ) was studied as a cathode active material for lithium secondary batteries compared to cyrstalline V 2 O 5 ( c ‐ V 2 O 5 ) and amorphous V 2 O 5 ‐ P 2 O 5 ( a ‐ V 2 O 5 ‐ P 2 O 5 ) (1, 2). The e ‐ V 2 O 5 showed similar behavior to a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered structures of block polymer/homopolymer mixtures. 3. Temperature dependenceHideaki Tanaka and Takeji HashimotoCite this: Macromolecules 1991, 24, 20, 5713–5720Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published inissue 1…
The structural properties of Sn at normal and high pressures are investigated using a self-consistent ab initio pseudopotential method. The structural stability of various phases including \ensuremath{\alpha}-Sn, \ensuremath{\beta}-Sn, simple hexagonal (sh), hexagonal close packed (hcp), body-centered tetragonal (bct)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcited-state acid-base chemistry of (.alpha.-diimine)cyanotricarbonylrhenium(I) complexesR. M. Leasure, LouAnn Sacksteder, D. Nesselrodt, G. A. Reitz, J. N. Demas, and B. A. DeGraffCite this: Inorg. Chem. 1991, 30, 19, 3722–3728Publication Date (Print):September 18, 1991Pub…
Abstract— Recent observations of fatigue cracks bridged by continuous fibers in titanium alloy and titanium aluminide composites are compared to analogous observations in fiber‐reinforced ceramics under monotonic loading. Three failure modes have been identified under axial loading in each case: longitudinal failure (…
The single human tyrosine hydroxylase (TH) gene generates four different mRNA species through alternative splicing events. TH-1 and TH-2 mRNAs are expressed mostly in the brain. We have produced large amounts of the corresponding proteins in Escherichia coli to analyze their respective molecular characteristics. The p…
We investigate the texture which appears as parallel stripes perpendicular to the smectic layers in SSFLC cells. When the temperature approaches the smectic A to smectic C* transition from above in the smectic A phase, a DC field induces the chevron structure due to the electroclinic effect and then the stripe texture…
A series of polymers, bisphenol A-based poly(phosphoesters), were evaluated as degradable biomaterials. Degradation was observed for the four polymers studied under both in vitro and in vivo conditions. The rate of degradation was affected by polymer side-chain structure and correlated with the swelling behavior. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPicosecond and nanosecond studies of the photoreduction of benzophenone by N,N-diethylaniline and triethylamineC. Devadoss and Richard W. FessendenCite this: J. Phys. Chem. 1991, 95, 19, 7253–7260Publication Date (Print):September 1, 1991Publication History Published online1…