Progress in thermal plasma deposition of alloys and ceramic fine particles
Abstract
Materials Literature
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Fatigue Properties of Type 304 Stainless Steel in High Pressure Hydrogen at Room Temperature
The fatigue properties of the soluted and the sensitized type 304 stainless steel were investigated in high pressure hydrogen up to 4.0 MPa at room temperature. It is found that both the number of cycles to failure and the fatigue limits of the soluted and the sensitized steel decreased with increasing hydrogen pressu…
Electron optical synthesis and optimization
A novel approach to electron/ion optical synthesis and optimization is presented. Low-aberration field distributions are sought by dynamic programming or optimal control procedures in the form of continuous curves constructed of cubic splines. A very simple algorithm is proposed for the reconstruction of the electrode…
Tuning of reactivity in epoxidation of alkenes by iron and ruthenium complexes associated to non-porphyrinic ligands
RuCl3·n(H2O) or FeSO4 associated with bipyridyl or substituted phenanthrolines, catalyse the expoxidation of stilbenes by IO4– or ClO–; using phenanthrolines bearing electron donating or withdrawing groups, it is possible to modulate the reactivity of these systems.
Surface Analysis of Gas Atomized Ferritic Steel Powder
The surface of gas atomized ferritic powder, Fe–25Cr, was studied by ESCA and Auger spectro- scopy. During atomization reaction products are formed on the surface of the powder. Due to the very low oxygen potential in the atomizer only oxides of the strong oxide forming elements Cr, Mn, and Si are formed during coolin…
Octahedral Compositions of Individual Particles in Smectite-Palygorskite and Smectite-Sepiolite Assemblages
Abstract Chemical analyses were carried out on individual particles in <2-μm size fractions to study smectite-palygorskite and smectite-sepiolite assemblages extracted from calcareous and dolomitic continental formations in Provence, southeastern France. A plot of the octahedral composition of 145 individual pa…
Chapter 9. Conduction electron spin resonance in metallic systems
R. N. Edmonds, M. R. Harrison and P. P. Edwards, Annu. Rep. Prog. Chem., Sect. C: Phys. Chem., 1985, 82, 265 DOI: 10.1039/PC9858200265
Oxygen exchange and protonation of polyanions: a multinuclear magnetic resonance study of tetradecavanadophosphate(9–) and decavanadate(6–)
Unlike decavanadate(6–), tetradecavanadophosphate(9–) shows pH-dependent differential rates of exchange of oxygen with solvent water. If the anion's structure is described as a Keggin-type ‘sphere’ with polar ‘caps,’ then at pH > 5 the caps are kinetically stabilised with respect to the ‘equator,’ whereas at pH < 1 th…
Recommended methods for the purification of solvents and tests for impurities: methanol and ethanol
Abstract
Crystal and molecular structures and magnetic properties of tetrameric copper( II ) complexes with 3-hydroxy-5-hydroxymethyl-4-(4′-hydroxy-4′-phenyl-2′-azabut-1′-en-1′-yl)-2-methylpyridine (H 2 L 3 ), [Cu 4 L 3 4 ]·9CH 3 OH and 3-hydroxy-5-hydroxymethyl-4-(4′-hydroxy-3′-methyl-4′-phenyl-2′azabut-1′-en-1′-yl)-2-methylpyridine (H 2 L 1 ), [Cu 4 -L 1 4 ]· 8CH 3 CH 2 OH : two complexes with ferromagnetic ground states
The crystal and molecular structures of the title compounds [Cu4L34]·9CH3OH (3) and [Cu4L14]·8CH3CH2OH (4) have been determined from single-crystal X-ray diffraction data and refined to final R values of 0.062 (R′= 0.052) using 2 191 independent reflections for (3) and 0.062 (R′= 0.055) using 2 458 independent reflect…
An Electrochemical Investigation of Localized Corrosion on Titanium in Chloride Environments
Electrochemical methods have been used to study the crevice and pitting corrosion behavior of unalloyed titanium in chloride solutions at elevated temperatures (maximum 150 C). The investigation was focused primarily on crevice corrosion. The techniques which were used included simultaneous measurement of the corrosio…
Zur Kinetik des Wachstums und der Speicherung von Poly‐D(−)‐3‐hydroxybuttersäure bei Alcaligenes latus
Abstract Alcaligenes latus strain DSM 1123 has been tested for the production of Poly‐D(−3)‐3‐hydroxybutyric acid using sucrose as the only carton source. The strain is capable of accumulating the polymer associated to the growth very fast and lup to high concentrations in the biomass. Alcaligenes lotus seems to be ve…
Infrared mesh filters fabricated by electron-beam lithography
Capacitive and inductive infrared mesh filters have been fabricated using electron-beam lithography combined with a lift-off procedure. A single level of PMMA was used to create positive tone patterns while a two-level metal-on-polymer process was used to create negative tone patterns. Resonant structures consisting o…
Crystal and molecular structures and magnetic properties of bromo(3-dimethylaminopropan-1-olato)copper(II), chloro(3-dimethylaminopropan-1-olato) copper(II), and (3-diethylaminopropan-1-olato)isocyanatocopper(II)
The crystal and molecular structures of the title compounds have been determined using three-dimensional X-ray diffractometer data and refined to a final R value of 0.0263 for bromo(3-dimethylaminopropan-1-olato)copper(II)(1), 0.0349 for chloro(3-dimethylaminopropan-1-olato)copper(II)(2), and 0.0268 for (3-diethylamin…
Soil‐Saprolite Profiles Derived from Mafic Rocks in the North Carolina Piedmont: I. Chemical, Morphological, and Mineralogical Characteristics and Transformations
Abstract The chemical, morphological and mineralogical properties of two Enon sandy loam (fine, mixed, thermic Ultic Hapludalfs) soil‐saprolite profiles, one formed on gabbro and the other on metagabbro, are compared. Clay skins are scarce and stress cutans common in the argillic horizons of these soils. Iron‐manganes…
Estimation of Cellulose Crystallinity Using Fourier Transform-Infrared Spectroscopy and Dynamic Thermogravimetry
Dynamic thermogravimetry (tga), differential thermogravimetry (dtg), and Fourier Transform-Infrared Spectroscopy (FT-IR) were performed on a variety of celluloses with different cyr3tallinities. The data were compared to the crystallinlty indices (C.I.) determined by X-ray diffraction. Highly significant correlations…
Längenstabilität bei Raumtemperatur von Proben der Glaskeramik "Zerodur"
"Zerodur", a glass ceramic, has been developed in order to have a material with an extremely small thermal expansion coefficient. The known physical properties are completed here by results on dimensional stability compiled over a number of years. Three samples of the material with different thermal histories show dif…
X-Ray diffraction determination of the cation distribution and oxygen positional parameter in polycrystalline spinels
A critical assessment is made of the calculation procedures currently used for determining the cation distribution in spinels from X-ray powder diffraction data. Both binary and ternary spinels are considered. It is shown that X-ray powder diffraction, in conjunction with appropriate computational methods, has enough…
Mechanism of anodic film growth on aluminium
SummaryA systematic study of film growth on aluminium, over a wide range of anodizing conditions, encompassing barrier and porous-type films, has been undertaken to develop a more integrated theory of anodizing than previously possible. The broad findings are summarized, via schematic diagrams of film sections and imm…
Thermal Cycling Effects in a Cu–Al–Ni Shape Memory Alloy
Thermal cycling effects in a Cu-13.7 Al-4.0 Ni (mass%) alloy have been studied by optical and electron microscopy observations and X-ray diffraction. Transformation temperatures, Ms and Af, decrease gradually with increasing thermal cycles, the magnitude of the decrease reaching about 40 K after 10000 cycles. Martensi…