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 conductivity measurements of 60WO3–40B2O3 and 40WO3–5Sb2O3–55TeO2 glasses have been carried out as a function of temperature. The results suggest that the conduction occurs by hopping of small polarons. Dielectric measurements of 60WO3–40B2O3 glass show that the temperature behavior could be described in terms of…
Two novel kinds of alcohol-soluble ladderlike poly(silsesquioxane)s containing side-chain hydroxy groups (OH-T1 and OH-T2) were prepared successfully for the first time by hydrolysis of ladderlike poly(silsesquioxane)s with side-chain ester groups (Ester-T1 and Ester-T2), which were synthesized by stepwise coupling po…
With the objective of obtaining slow-acting isoniazid derivatives, of potential use as chemoprophylactics or chemotherapeutics in tuberculosis, the micelle-forming copolymer of poly(ethylene glycol)-poly(aspartic acid) prodrug with isoniazid was synthesized. The derivative obtained was found to be active in Mycobacter…
We report on the cooperative photoluminescence (PL) properties of closely packed CdSe nanocrystal thin films and propose a model to elucidate the nonlinear PL behavior. The PL exhibits an initial decay and a subsequent enhancement under continuous excitation, which are attributed to the photodarkening and the effects…
Ternary lithium germanophosphate glasses have been synthesized over a wide range of compositions. Thermal and spectroscopic techniques (IR, Raman, and 31 P MAS NMR) have been used to investigate their properties and structures. It is found that modification occurs almost exclusively on the P 2 O 5 part of the structur…
Conductivity and magnetic susceptibility of disordered cubic titanium monoxide TiO y (0.920≤ y ≤1.262) are studied. Temperature dependences of the conductivity of TiO y monoxides with y ≤1.069 are described by the Bloch-Grüneisen function with Debye temperature 400–480 K, and temperature dependences of the susceptibil…
The present study investigated whether electrochemical impedance spectroscopy (EIS) could be used to monitor stress corrosion cracking (SCC). First, a model was developed that interpreted the impedance response of a cracked surface (i.e., the model could distinguish between a flat electrode surface and a surface with…
A three-dimensional (3D) multi-dislocation system in an elastically anisotropic crystal under applied stress is considered as a particular case of the phase field microelasticity theory of multivariant stress-induced martensitic transformations. This approach reduces the problem of evolution of a dislocation system to…
The thermal shock resistance (indentation–quench method), fracture toughness, and thermal conductivity of three alumina–silicon–carbide–whisker composites and alumina have been investigated. A new procedure for the evaluation of thermal conductivity data is suggested, and higher room‐temperature thermal conductivity t…
The recrystallisation behaviour of PM2000 oxide dispersion strengthened ferritic alloy has been investigated for tube specimens which had been cold deformed after extrusion. The evolution of the recrystallisation temperature, defined as the minimum temperature at which the specimen begins to recrystallise, has been st…
X-ray structure determination of proteins by using the multiple-wavelength anomalous dispersion method targeting selenomethionine is now widely employed. Isoleucine was examined for the second choice of the substitution of methionine next to leucine. We performed a systematic mutational study of the substitutions of m…
Nitroaromatische Sprengstoffe können einfach und schnell nachgewiesen werden, indem man das Löschen der Photolumineszenz fluoreszierender Polysilole beobachtet. Das Löschen beruht auf dem Elektronentransfer vom Leitungsband der Polysilole zu elektronenarmen Molekülen wie Pikrinsäure, Nitrobenzol, DNT und TNT. Verdünnt…
O plástico tem sido cada vez mais usado em nosso cotidiano em diversos tipos de produtos: garrafas, embalagens, automóveis, etc. Diversas alternativas têm sido buscadas para minimizar o impacto ambiental causado pelos polímeros convencionais. Uma importante alternativa é o uso de polímeros biodegradáveis, que podem se…
BaTiO 3 ceramics doped with different La concentrations (0–12 mol%) were prepared by sintering under the reducing conditions of a nitrogen atmosphere containing 1% hydrogen. The critical donor concentration that causes blocking of the exaggerated grain growth was observed to be ∼10 mol% La. The samples, which were sem…
A new type of guided-mode resonant grating filter is described. The filter is independent of polarization state for oblique incidence. The filter has a crossed grating structure, and the plane of incidence on the filter contains the symmetric axis of the grating structure. Theoretical considerations and numerical calc…
This paper deals with some of the physical properties of face-to-face woven carpets with different structural parameters. Based on appearance retention, abrasion resistance, and tuft withdrawal tests, effective parameters of carpet quality are determined by variance and regression analyses, and the changing characteri…
Various methods of order parameter determination from optical measurements are compared. Measurement results of birefringence and refractive index of liquid-crystalline 4'-pentyloxy-4-cyanobiphenyl (OCB) in the nematic phase are reported. Using these data, the polarizability anisotropy was calculated for both Vuks and…
Abstract Solid state microcellular foaming technology was employed to investigate the influence of impact modification on the foamability of neat rigid PVC and rigid PVC/wood‐flour composite samples. The effects of impact modifier types (crosslinked versus uncrosslinked) and concentrations on the void fraction of foam…
We study the surface behavior of Langmuir films of highly concentrated interfacial colloids composed of flocculated silver nanoparticles located at the liquid−liquid interface of water and dichloromethane. Pressure/area isotherms and UV−visible absorption−reflection spectra are acquired in situ simultaneously. The beh…
Most of the important and general dynamic properties of structural glass-forming substances have been classified into twelve different categories in a recent review. Within the same property in each category, by examining a large number of glass-formers, a pattern of variation is found which correlates with the depart…