Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution and solid-state properties of hybrid linear-dendritic block copolymersIvan Gitsov and Jean M. J. FrechetCite this: Macromolecules 1993, 26, 24, 6536–6546Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 Novemb…
Sequences of 16 NAD and/or NADP-linked aldehyde oxidoreductases are aligned, including representative examples of all aldehyde dehydrogenase forms with wide substrate preferences as well as additional types with distinct specificities for certain metabolic aldehyde intermediates, particularly semialdehydes, yielding p…
This manuscript reviews an approach for improved design and lifetime evaluation for environmental cracking based on fundamental modeling of the underlying, operative processes in crack advance. In outlining this approach and its application in energy industries, the requirements for a life prediction methodology will…
Abstract Various dinuclear copper(II) compounds bridged by the oxalato, oxamato, and oxamidato ligands were prepared and characterized by means of magnetic susceptibility and IR spectroscopy. The strong antiferromagnetic couplings through their carboxylate or carboxamidate groups are interpreted in terms of the ligand…
Dilute aqueous solutions of two surface active agents (surfactants) were tested for their ability to suppress spontaneous steam explosions in molten tin/water systems. At 800° C, 12 g of tin were dropped into aqueous solutions of a nonionic surfactant (nonylphenol polyethylene glycol ether) and an ionic surfactant (do…
Isothermal fatigue and in‐phase thermomechanical fatigue (TMF) tests were performed on a unidirectional, continuous‐fiber, Nicalon®‐reinforced calcium aluminosilicate glass‐ceramic composite ([O] 16, SiC/CAS‐II). Monotonic tensile tests were performed at 1100°C (2012°F) and 100 MPa/s (14.5 ksi/s) to determine the mate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMethylhydridopolysilazane and its pyrolytic conversion to silicon nitride-silicon carbide (Si3N4/SiC) ceramicsNeal R. Dando, Anthony J. Perrotta, Carsten Strohmann, Regina M. Stewart, and Dietmar SeyferthCite this: Chem. Mater. 1993, 5, 11, 1624–1630Publication Date (Print):…
Numerical micromagnetic calculations of the nucleation field of two-dimensional magnetic microstructures reveal the effects of interparticle interactions on the magnetization reversal mechanism. The results show that the magnetic behavior of interacting particles drastically changes with the grain size. For an average…
Yarn pullout behavior from a woven fabric is an important indicator of the mech anism of yarn interactions within the fabric and a predictor of its various mechanical properties. It is investigated in this paper both theoretically and experimentally. An analytical model developed for nonwoven structures is modified he…
Ga-doped Nd-Fe-B sintered magnets show an improved wetting behavior of the liquid phase during sintering and the formation of additional Ga-containing intergranular phases. Nb forms precipitates within the hard magnetic grains and enhances the coercivity. In the as-sintered magnets, a new Nd-rich Ga-containing region…
The complex dielectric permittivity and the complex magnetic permeability of the orthoferrites RFeO/sub 3/ (R=Y, Tm, Dy, Gd, Ho, Er, Tb) and Y/sub 1-x/Lu/sub x/FeO/sub 3/ have been investigated at submillimeter wavelengths v=100-1000 GHz. The parameters of the two antiferromagnetic resonance modes (resonance frequenci…
CeO(x)F(y) films were made by reactive rf magnetron sputtering of Ce in Ar + O(2) + CF(4). Stoichiometries between CeO(2) and CeO(1.0)F(1.3) were obtained when the CF(4) content lay between 0% and 9%. For wavelengths λ of > 0.4 µm, the films were almost nonabsorbing, and the refractive index at λ = 0.55 µm went from 2…
An expression is derived for the calculation of the rotational power loss in electrical steel laminations, i.e., the iron loss associated with the torque caused by the angle of lag between H and B. It is shown that for a nonpurely rotating flux density, i.e., noncircular flux density loci, the instantaneous angular ve…
The effects of shear forces externally applied to the skin surface on the underlying tissues have been investigated. An analysis of the internal stresses and strains was conducted using a simplified model incorporating elasticity theory. Skin blood flow was measured using laser Doppler flowmetry while variable shear f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic properties of lanthanum strontium transition metal oxides (La1-xSrxBO3; B = manganese, iron, cobalt, nickel) for toluene oxidationJeng Jong Liang and Hung-Shan WengCite this: Ind. Eng. Chem. Res. 1993, 32, 11, 2563–2572Publication Date (Print):November 1, 1993Publi…
Silver and gold island films have been evaporated onto various polymer surfaces; the samples were characterized by surface-enhanced Raman spectroscopy (SERS), UV-visible spectroscopy, and x-ray photoelectron spectroscopy (XPS). Among the series of investigated polymers, the SERS spectra recorded on stretched polyethyl…
Barium hexaferrite thin films deposited by RF magnetron sputtering have exhibited saturation magnetization 90% of that of bulk single crystals, whereas the perpendicular uniaxial anisotropy is only 60% of that of the bulk. X-ray diffraction spectra suggest good c-axis orientation perpendicular to the film plane. Howev…
This paper describes the needs of the aviation and automotive markets for structural materials and presents examples of developments of aluminum alloy products to fill these needs. Designers of aircraft desire materials which will allow them to design lightweight, cost-effective structures which have the performance c…
The relaxation properties of Gd(DOTP)5- (1, 4, 7, 10-tetra-azacyclododecane- N,N',N'',N'''-tetrakis(methylenephosphonic acid)) have been investigated as a function of pH, temperature, concentration, and magnetic field strength. We have found that the complex has one exchangeable water molecule in its inner coordinatio…
We present Monte Carlo calculations of the pressure-composition isotherms of palladium hydride using recently constructed embedded-atom-method potentials and a Monte Carlo method that allows for volume equilibration as the composition varies.