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。
Layered polysilane synthesized according to a new recipe was characterized mainly by photoluminescence (PL) measurement. The PL spectrum of the as-prepared sample had a broad peak at 2.0 eV. The PL peak of a sample annealed at 300°C was also at 2.0 eV, and its PL intensity was several times greater than that of the as…
Ten polypyromellitimides, seventeen poly(imide esters) and six poly(imide amides) have been synthesized. The stability of 0.5% solutions of the poly(amic acids) in DMF, and the hardness, adhesion to glass and quality of nematic liquid crystal alignment of the polyimide layers using the interference wedge method have b…
Fluorinated Bis-GMA was synthesized and used with other commercially available fluorinated monomers and diluents to prepare hydrophobic composites. The composites were formulated as one-paste systems and were polymerized using blue light. Mechanical properties and water-related qualities were determined. Fluorination…
Abstract A novel approach to the extrusion of high‐density, rigid PVC foam uses commercial RPVC compounds with inert‐gas physical blowing agents (carbon dioxide and argon). The process was developed on a segmented single‐screw extruder with L/D of 40. On‐line monitoring of process variables was also carried out. This…
A `free-standing' microdisplacement calibrator is described which utilizes a previously proposed but untested design of monolithic x-ray interferometer. The monolith is driven by a twist-compensating electromagnetic actuator and a specially designed 1 ppm current source and is held, along with its x-ray source and det…
A simple closed-form expression has been derived for the instrumental broadening function of the general Barrels five-crystal diffractometer. The use of this result allows the extraction of sample rocking-curve widths from the measured widths. Such use facilitates the determination of dislocation densities in heteroep…
Improved powder XRD patterns for the titanium suboxides, Ti n O 2 n −1 (4≤ n ≤9), have been calculated from published single-crystal structures. To provide the best match with experimental data, the entire diffraction traces were simulated, and d -spacings and intensities extracted in the same manner as from experimen…
A laboratory study was conducted to examine the effects of increasing concentrations of oxalate and citrate anions on soil phosphate (P), aluminum (Al), and iron (Fe) solubility and P sorption/desorption from some volcanic ash soils. Duplicate 1.0 g soil samples were shaken with 10‐mL portions of 0.01M NaCl solution c…
Intrinsic defects of the nearly stoichiometric (110) surface of TiO2 have been studied by means of scanning tunneling microscopy. Temperature treatment at 870≤T≤1070 K in ultrahigh vacuum induces changes of the orientation of single steps. Line defects along [001] and oxygen vacancies are formed simultaneously as pred…
A new method to obtain nearly homeotropic alignment with small pretilt angles off the substrate normal employing vacuum oblique evaporation of SiO x has been developed. Selected pretilt angles in the range of (0–5) degrees can be easily obtained with this method and it is not very sensitive to the deposition angle, an…
Inducer expulsion, a phenomenon in which rapidly metabolizable sugars cause cytoplasmic dephosphorylation and efflux of pre-accumulated sugar-phosphates (sugar-P), has been documented for Streptococcus pyogenes, Streptococcus bovis, and Lactococcus lactis, but not for other Gram-positive bacteria. Using intact cells a…
The EROPAQ quality assurance project started in 1994 with TLD postal dose intercomparisons for photon beams used in 47 radiotherapy centres in the middle and eastern European countries. The photon dose intercomparisons include beam output checks and beam quality checks. Since an acceptance limit of +/- 3% was chosen f…
Article Influence of Heat Treatment on the Physical, Mechanical and Tribological Properties of a Zinc-based Alloy was published on March 1, 1996 in the journal International Journal of Materials Research (volume 87, issue 3).
A matching algorithm is proposed for aligning microscope images obtained using different modalities, making use of cross‐correlations of outputs from Prewitt's edge filter. Brightfield, phase contrast and differential interference contrast microscope images of algal and bacterial cells from an experimental, high‐rate…
This paper presents a theoretical study on the initial stage of diamond nucleation during chemical vapor deposition. A kinetic model is developed to investigate the time evolution of diamond nucleation on carbide‐forming substrates. The calculated results provide some insight into the effects of substrate materials, s…
Reliable identification of the diatoms is of crucial importance to understand the changing environmental signals stored in the sediments of Lake Baikal. Light and scanning electron microscopy combined with mathematical methods, including principal components analysis, were used to estimate morphological diversity in t…
The preliminary dielectric and neutron scattering results obtained on two granular ferroelectrics (with particles diameters ∼ 7 nm) – sodium nitrite and Rochelle salt embedded into microporous glass matrix are presented.
The characterization of strictly anaerobic bacteria which can reduce thiosulfate into hydrogen sulfide is described. Although thiosulfate reduction is a common metabolism in the bacterial world, its implication regarding microbiologically influenced corrosion has never been investigated. Thiosulfate is in ecosystems w…
Near-infrared surface-enhanced Raman scattering (NIR SERS) spectra were obtained for 2,2-bipyridine, 5,6-benzoquinoline, pyrene, anthracene, and fluoranthene on SERS pre-activated thin-layer chromatography (TLC) plates by Fourier transform (FT) Raman spectroscopy. The pre-activation of TLC plates was based on a proced…
The behaviour of n- and p-type crystalline silicon wafers in quiescent concentrated aqueous HF solutions has been studied for immersion times up to 205 days. The etch rate, as determined from weighing experiments, decreased with time to values as low as after prolonged etching. The experimental findings are consistent…