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 relevance of exothermic melting according to the Tammann loop-shape crystal phase boundary (A. L. Greer, Nature, 2000, 404, 134) is examined. It is proposed that combined effects of the crystal space group, free volume, anharmonicity, and configurational entropy may lead to volume and entropy decrease on melting.…
Corynebacterium glutamicum 3-deoxy-D-arabino-heptulosonate-7-phosphate (DAHP) synthase is sensitive to feedback inhibition by tyrosine. One feedback-insensitive mutant was obtained by in vitro chemical mutagenesis and the mutation was identified as a C-->G mutation at nucleotide 560 causing a Ser(187) to Cys(187) subs…
Mixed oxide materials belonging to the perovskite family (ABO3, LaCoO3) have come under intense scrutiny for their possible applications in different scientific and technological fields, such as heterogeneous catalysis, oxygen sensors, solid oxide fuel cells and magnetic media. The growing interest in such mixed oxide…
First Name is required invalid characters Last Name is required invalid characters Email Address is required Invalid Email Address Invalid Email Address
Mass impregnated paper insulated cables in distributionnetworks (6-33 kV) nowadays are gradually being replaced byXLPE insulated cables, yet, the percentage of mass impregnatedcables in distributio ...
The correlation between charge distribution in an aged crosslinked polyethylene (XLPE) cable and the location of water trees has been studied. The space charge radial distributions at different angle in the insulating wall of a service-aged XLPE coaxial cable, induced by application of a DC stress, were measured using…
We analyzed the physicochemical characteristics of solid dispersions of pizotifen malate and povidone (Kollidon 12) at different proportions; we used X-ray diffraction, infrared spectrometry and differential scanning calorimetry (DSC) and tested the solubility of the solid dispersions in equilibrium. The results were…
Through-hole diamond membranes with submicrometer-sized pores were fabricated by oxygen plasma etching through an anodic porous alumina mask. Polished polycrystalline diamond film (3 μm thick) was covered with the porous alumina mask and was etched for about 10 min. The resulting diamond membrane after separating from…
The crystal structure of [Tl2(sac)2(H2O)]n (sac = saccharinate anion) has been solved using single crystal X-ray diffraction. It crystallizes in the triclinic space group P 1 with Z = 2 and presents a polymeric structure formed by two saccharinate anions, one water molecule and two chemically different TlI cations, on…
Carboxylic acids, particularly fatty acids, are by far the most important surface modification systems for inorganic fillers used in the plastics and rubber industries. However, relatively little is understood regarding factors that affect their adsorption behaviour, including the interplay between acid molecular stru…
A facile synthesis of an optically active di-isocyanate containing alkylene groups and a preformed imide structure is described. Polycondensation reactions of the prepared di-isocyanate with pyromellitic dianhydride, benzophenone tetracarboxylic dianhydride, and hexafluoroisopropylidene diphthalic anhydride resulted i…
Anhydrous theophylline was prepared by heating theophylline monohydrate at temperatures between 60 degrees C and 140 degrees C. The effects of dehydration temperatures on the moisture absorption and dissolution behavior of anhydrous theophylline were investigated in this study. The hydration rate of anhydrous theophyl…
A series of bis(4-thio-1,8-naphthalic anhydride)s and the corresponding bis(N-amino naphthalimide) derivatives were synthesized from readily available compounds in high yield. A series of novel poly(thioether-naphthalimide)s, which utilized hydrazine as the diamine, were synthesized by a one-step polymerization reacti…
The objective of this study was designed to elucidate the importance of adding pluronics to PCL microparticles for the delivery of proteins. The influences of the type and the amount of pluronic on the surface morphology and release properties of protein-loaded PCL microparticles were evaluated. Microparticles were pr…
We review our recent X-ray scattering studies of charge and orbital order in doped manganites, with specific emphasis on the role of orbital correlations in Pr1-xCaxMnO3. For x=0.25, we find an orbital structure indistinguishable from the undoped structure and long-range orbital order at low temperatures. For dopings…
Replacement of divalent Sr 2 + ions by monovalent K + ions in La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 2.85 ( LSGM ) decreases the electrical conductivity of LSGM and increases the activation energy to 1.42 eV. Substitution of La by substantial amounts of up to 50 atom % of Pr in LSGM yields new mixed oxide ion and electronic co…
The processing response of a 70% silicon nitride–30% barium aluminum silicate (70%‐Si 3 N 4 –30%‐BAS) ceramic‐matrix composite was studied using pressureless sintering, at temperatures ranging from 1740°C, which is below the melting point of BAS, to 1950°C. The relationship between the processing parameters and the mi…
Barium ferrite (BaFe12O19), lithium ferrite (Li0.5Fe2.5O4) and magnesium zinc ferrite (Mg0.5Zn0.5Fe2O4) have been prepared by self-propagating high-temperature synthesis (SHS) reactions from iron, iron(III) oxide and metal oxides and peroxides. The driving force for the reactions is the oxidation of iron powder. React…
The modeling of magnetic components for use in electrical circuit simulation requires that the core material be accurately characterized. This paper investigates a method of extracting parameters to model the hysteresis behavior of magnetic core materials and optimizing them to achieve accurate results during circuit…
The syntheses of three new salen ligands that are tethered to a p-acylthio(phenylacetylene)n linker are described. The two key steps in the syntheses are coupling of the p-acylthio(phenylacetylene)n linker (n = 0–2) with a 5-iodosalicylaldehyde and the subsequent condensation of the aldehyde moiety of the formed adduc…