Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Novel Thermally Stable PolypyrazolesJ. A. Moore and Parag G. MehtaCite this: Macromolecules 1995, 28, 2, 444–453Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 1995https://pub…
Porphycene, a structural isomer of porphyrin, reacts with the Vilsmeier reagent (DMF–POCl3) to give a one-carbon bridge between two pyrrolic nitrogens; this new structure is characterized by NMR and X-ray crystallography.
Control of NOXemissions from combustion sources has become an important issue in recent years, particularly in the ozone nonattainment areas of California. Cement kilns represent an important source of NOXemissions, and they either have already been regulated or are being considered for future regulations. The develop…
Grain texture and magnetic properties of ultra thin silicon steel sheets were investigated. The sheets were produced using two kinds of starting materials. One was conventional grain oriented silicon steel sheet and the other was hot rolled silicon steel. Ultra thin sheets were obtained by cold rolling with intermedia…
γ-Hydroperoxy-α,β-unsaturated carbonyl compounds are prepared in good yields by the regioselective hydroperoxygenation of α,β,γ,δ-unsaturated carbonyl compounds with molecular oxygen and triethylsilane in the presence of cobalt(II) porphyrin as a catalyst.