Materials Literature
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A general model and analytical results have been derived to obtain laser-induced temperature rise in substrates with periodic multilayer structures. The substrate can be equivalent to a homogeneous substrate with anisotropic thermal conductivity, if the dimension of the periodic structure is much smaller than the lase…
By using Auger electron spectroscopy (AES) to obtain chemical information from the fractured surfaces of rapidly quenched and sintered NdFeB magnets, it is found that the Nd-rich phases in the grain boundaries are different in these two kinds of magnets. In rapidly quenched NdFeB magnets, the Nd-rich phase is mainly N…
It is argued that the sintering and densification of Si3N4 based ceramics, using transition metal or rare earth metal oxide additives, can be described as an electronic mechanism involving a transfer of electrons into the Si3N4–SiO2 valence band: this is consistent with a recently proposed model of bonding at metal/ce…
The effects of HDDR (hydrogenation decomposition desorption recombination) phenomena on the magnetic properties of SmFe11Ti, SmFe10MM', NdFe11Ti, and Nd1+δFe10MM' (δ=0, 0.3, M=Ti, V, Mo, M'=V, Mo) compounds with a ThMn12-type structure were investigated. Alloy powders of SmFe10V2, SmFe10TiV, and NdFe10MM' (M=Ti, V, Mo…
Silicon carbonitride monoliths derived from polymer powder compacts via polymer pyrolysis represent a new class of structural ceramic materials due to the complete coalescence of the powder particles during polymer decomposition and the formation of a uniform ceramic matrix free from any grain boundaries or secondary…
Abstract The feasibility of combining selective reduction of nitric oxide by ammonia, or nitric oxide oxidation by methanol, with partial flue gas condensation has been studied in the laboratory. It was demonstrated that both combinations may result in high removal efficiencies for nitric oxide and sulfur dioxide. Hig…
Abstract The interaction of poly(ethylene glycol) with some salts of alkali‐earth metals (Mg(ClO 4 ) 2 , BaCl 2 , SrCl 2 , SrBr 2 and CaCl 2 ) in methanolic solutions was investigated by electroconductivity, viscometry, X‐ray diffractometry and NMR. It was established that the conformation of macromolecules is strongl…
Statistical-thermodynamic calculations have been combined with the results of high-temperature Knudsen-effusion studies of the vaporization of Si2Te3 to calculate the thermodynamic properties of SiTe(g) from T→0 to T=2000 K. The dissociation enthalpy D○m(SiTe, T→0) is (448±8) kJ⋅mol−1; its value is discussed vis-a-vis…
Abstract A protoporphyrin IX derivative having a phospholipid residue (lipid-porphyrin) was synthesized. The lipid-porphyrin itself formed an oval multilamellar vesicle in an aqueous medium. The spectral features of the lipid-porphyrin vesicle indicated a stacked configuration of the porphyrin moiety.
Article The crystal structure of wolframite type tungstates at high pressure was published on November 1, 1993 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 207, issue 1-2).
Analysis of net and bottle samples from the southern Gulf of Mexico allowed documentation of the morphological variation exhibited by 201 chains of the planktonic diatom Chaetoceros diversus Cleve. Considerable variation existed in the length (i.e. number of cells) and curvature of chains, dimensions of individual cel…
The texture and microstructure of rolled and annealed pure Ta was investigated by means of quantitative texture analysis and metallography. The rolling textures were discussed using simulations according to Relaxed Constraints Taylor Theory. The annealed samples revealed recovery and continuous recrystallization for w…
Abstract Isotropic and oriented thin films of rigid‐rod, rigid‐rod pseudo‐ladder, and ladder polymers were ion‐bombarded with 84 Kr + to a dose of 4 × 10 16 ions/cm 2 . The bombardment was conducted at two conditions: one at 190 keV energy with 0.12 μA/cm 2 current density and the other at 200 keV energy with 2.0 μA/c…
Nd/sub 5/Fe/sub 17/ (also referred to as A/sub 2/-phase) is prepared by rapid-quenching and subsequent annealing. Due to the fine, homogeneous distribution of the elements in the melt-spun ribbons, only a short reaction time is required in the annealing treatment. The samples are almost single-phase, as revealed by X-…
The typification of Pleurosigma obscurum W. Smith is discussed with reference to material collected by W. Smith. The placing of the species in the genus Gyrosigma in recent publications is incorrect. All intact cells of this organism were collected in non-marine samples. Claims in the literature for a marine-brackish…
The depth profiles of activated boron concentration N B in the Al/p + -diamond Schottky diodes were systematically investigated from the junction capacitance-voltage ( C - V ) curves. The observed 1/ C 2 vs V plot did not fall on straight lines, indicating a nonuniform depth profile of N B . Using these C - V curves,…
The magnetization of a MnFeAs/sub y/P/sub 1-y/ system for y=0.275 and y=0.30 is measured under a static magnetic field up to 28 T at temperatures from 4.2 to 400 K. Field induced phase transitions are observed, and the critical points are found on (B, T) phase diagrams. In the case of y=0.275, the pressure measurement…
Many discussions of miscibility in polymer blends are based on the Gibbs free energy for a strictly-binary system, usually in the approximation of Flory,l hug gin^,^^^ and Staverman and Van Santen,4y5 which we call the FHS model.We find, by sample calculations described below, that the presence of polydispersity in on…
Abstract Mangetic bead cellulose was prepared from viscose and ferrite powder by employing the suspension procedure using the thermal sol‐gel transition. The particles thus obtained can be stirred if acted upon by an external rotary magnetic field of a common permanent magnet. Isolation of the particles from reaction…
The stress corrosion susceptibility of 25Cr–6Ni–3Mo duplex stainless steel (alloy 255, UNS S32550) in boiling 35% MgCl 2 solution has been examined in terms of the relationship between the critical cracking potential E cc for duplex stainless steel. Mill-annealed alloy 255 loaded to 90% of the yield strength in a boil…