Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The formation of metal-ceramic multi-phase microstructures by partial reduction of ternary or higher ceramic oxides has been experimentally investigated in the model system FeMnO and in the more practical system AlNiO by changing the oxygen partial pressure at constant temperature and total pressure. In the FeMnO syst…
Summary A type 329J1 duplex stainless steel was welded by single‐pass gas tungsten arc welding in an argon‐nitrogen mixed gas atmosphere. The microstructure, Vickers hardness, and Charpy impact toughness of the weld metal were examined. The nitrogen content increases and the ferrite content decreases with increasing n…
The Pitzer ion-interaction model was employed to predict the conversion in the title quaternary water-salt system. The thermodynamic solubility products (K s 0 ) were determined and the conversion of CaSO 4 to CaCO 3 in the CaSO 4 + Na 2 CO 3 = CaCO 3 + Na 2 SO 4 system was predicted. The standard molar Gibbs free ene…
Pd/Al2O3 samples of different palladium loadings were prepared by an incipient wetness technique. The palladium dispersion (D) of each sample was estimated from its isotherm of hydrogen uptake measured volumetrically at 298 K. The isosteric heat of hydrogen sorption (q, including absorption and adsorption) on palladiu…
The combustion behavior of several elemental materials was studied using their threshold pressures (minimum pressure required to sustain combustion in 3.2-mm-(0.13-inch) diameter rod) as the ranking criterion in a promoted combustion test apparatus. Test media varied from 100% aviator's breathing oxygen to air and the…
The key to conducting an accurate damage assessment of a target impacted by a high speed projectile is the use of a robust assessment methodology. To accurately determine total target damage, a damage assessment methodology must include the effects of discrete impacts by solid debris cloud fragments as well as impulsi…
Chemical states of Mn in BaTiO3 and interactions between Mn and other dopants were studied mainly by chemical analysis and ESR spectroscopy. Chemical analysis showed that the average valency of Mn doped into BaTiO3 was about 3.4, indicating the occurrence of a significant concentration of oxygen vacancy. The average v…
V 1– x W x O 2 and V 1– x Mo x O 2 , 0 < x < 0.03, powders have been produced by the evaporative decomposition of solutions of vanadyl sulfate hydrate with tungsten dioxide dichloride or molybdenum dioxide dichloride in a hydrogen/nitrogen atmosphere. The powders consist primarily of hollow, porous, spherical sh…
This work, based on the Doctoral thesis of the autor (Santamaria, 1991), deals on the sistematics of the superfamiliy Acanthocerataceae from the Upper Cenomanian to Santonian of the northern part of the North-Castillian platform and the southern part of the Navarro-Cantabrian basin. In this second part fifty ammonite…
The palladium(II) complexes cis-[PdCl2([18]aneS2O4)], [Pd([18]aneS2O4)2][PF6]2([18]aneS2O4= 1,4,7,10-tetraoxa-13,16-dithiacyclooctadecane), [Pd([18]aneS3O3)2][PF6]2([18]aneS3O3= 1,4,7-trioxa-10,13,16-trithiacyclooctadecane) and [PdCl([20]aneS3O3)]BPh4([20]aneS3O3= 1,4,7-trioxa-10,14,18-trithiacycloicosane) have been s…
The dissolution behaviour of a 22% chromium duplex stainless steel with very low nitrogen content and containing various amounts of ruthenium was investigated. It was found that the ruthenium additions inhibits the anodic dissolution behaviour when active corrosion took place. Furthermore it was established that only…
This paper reviews the designs and performance of tubular solid oxide fuel cells (SOFCs). A large number of tubular cells of the porous support tube type have been electrically tested, some to times over 50,000 hours; these cells have shown excellent performance and performance stability. Since 1984, successfully larg…
The impact properties of the thermoplastic composites containing ground rubber tires (GRT) have been investigated. Linear low density polyethylene (LLDPE) was used as the thermoplastic polymer matrix. Ground rubber tire crumb of average mesh sizes 40 (GRT40) and 80 (GRT80) were used. To improve the impact strength dif…
Single crystals of non-linear Huntite-type borates, with good optical quality, have been grown by slow cooling from fluxes based on the K2O-MoO3 system. Crystals corresponding to the general formula Y1-xNdX(Al0.7Ga0.3)3(BO3)4(x = 0.05 and 0.15) were obtained with a relatively small size (3 × 3 × 3 mm3) whereas those w…
A simple method is described for measuring the time dependency of the magnetization reversal process in the yoke of thin-film inductive write heads. Measurement results are given for an experimental head, showing close agreement with earlier published, calculated data.
Only recently has it been possible to make iron based analogues to Sm-Co based compounds that exhibit energy products of greater than 20 MG De. These compounds have generally been in the form of pseudobinaries since some other element is required either to help stabilise the crystal structure or to modify the anisotro…
Abstract In separation processes containing solids, mostly crystals, the interest in shape modifications of the solids has increased. The idea in it is the necessity to save energy, to achieve specific product requirements, e.g. purities, or to provide downstream processes with better feed material. For an organic cry…
Abstract Aridisols with smectite B horizons are usually classified as Argids although the argillic characters may not always be present. In the Chihuahuan Desert of northern Mexico, some Aridisols have clayey horizons that do not seem to result from clay illuviation. Our purpose was to determine the origin of the clay…
A novel chiral twin molecule, (R)-3-methyladipic acid bis{2-[4-(5-octyl-2-pyrimidinyl)phenyloxy]ethyl} ester (MAB-8-PYPOE), has been prepared and the effect of the spacer structure on the physical properties investigated. The phasetransition behaviour and helical twisting power of the molecule were compared with those…
The electrostatic discharge between a clothed human body and the ground has been investigated under conditions of low atmospheric humidities. Measurements were carried out during two experiments which generated electrostatic charge from two different types of human activity. Subjects wore layered garment systems consi…