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。
Many of the MR examinations performed in the world each year are accompanied by administration of one of these frequently used intravenous contrast agents: Magnevist, Omniscan, and ProHance. Accordingly, MR practitioners must understand the basic pharmacokinetics, side effects, and the potential for adverse events for…
Abstract Blends of linear low density polyethylene (LLDPE) and linear low density polyethylene grafted with maleic anhydride (LLDPE‐gMA) were used to promote adhesion between LLDPE and ethylene‐vinyl alcohol copolymer (EVOH) in a coextruded three layer flat film, trying to avoid the use of a tie layer. These particula…
We report measurements of the anchoring energy of 5CB (4-cyano-4′-n-pentyl-biphenyl) at a commercial polyimide (AL1051) with a method using a large applied electric field on thick measurement cells. The experiments reveal a deviation from the expected behavior of the system and cannot be described by the usual Frank e…
The clearance of anthracyclines from the vasculature was studied in perfused tissue-isolated tumors. Human tumor lines MCF-7, U87, and LS174T were implanted in the ovarian fat pad of immune-deficient mice and grown isolated from the surrounding tissue. The initial and continuous tissue uptakes of doxorubicin, daunorub…
Structural and vibrational properties are investigated in SiC nanopowders synthesized by a CO2 laser pyrolysis of (SiH4, C2H2) gaseous mixture and thermally treated up to 1800 °C. The structural modifications of the SiC crystallites and the arrangement of the carbon in excess are monitored at different annealing stage…
A method is described for correcting the binding energy scale for specimen charging that occurs during XPS analysis of insulating samples. A small quantity of polymeric poly (dimethyl silicone) (PDMS) is deposited from solution onto the surface of a series of polymers. After XPS analysis, the binding energy scale is t…
Using Monte Carlo simulations, we study the relaxation and short-time diffusion of polymer chains in two-dimensional periodic arrays of obstacles with random point defects. The displacement of the center of mass follows the anomalous scaling law ${r}_{\mathrm{c}.\mathrm{m}.}{(t)}^{2}{=4D}^{*}{t}^{\ensuremath{\beta}},$…
Conventional N234 carbon black was chemically modified by a low temperature treatment with dinitrogen trioxide (N2O3), nitrogen oxide (NO) and dinitrogen tetroxide (N2O4). The purpose of this treatment was to increase significantly the fraction of polymer chain segments chemically linked to the filler surface in compa…
Flooded soil with the addition of Fe-containing slags (1% to soil) was incubated under laboratory conditions. Five commercial slags were used in this study. The slag samples were numbered from I to V in ascending order of acid-soluble Ca content. The pH of the soil solution increased with the increase in the Ca conten…
In order to increase the hydrophilicities, thereby to impart soil resistance and to improve dyeability, poly(ethylene terephatalate) (polyester) fabrics were treated in low‐temperature plasmas. Two alternative modifications were applied. Fabrics were directly treated in acrylic acid plasma in one investigation, while…
Strong and tough glass‐ceramic materials based on the complex chain silicate miserite (KCa 5 open square(Si 2 O 7 )(Si 6 O 15 )F) have been prepared using standard frit sintering and internal nucleation processes. The miserite may be accompanied by crystals of fluorite, cristobalite, xonotlite, a canasite‐like phase,…
In cholesteric liquid crystals with a positive dielectric anisotropy, the relaxation from the electric field-aligned director configuration to the stable zero field director configuration proceeds via a metastable transient planar director configuration which has a pitch distinct from the equilibrium state. The transi…
An Al-Co-Cu vertical phase diagram along the 65 at% Al isopleth was constructed with the aim of growing a single decagonal quasicrystal. The decagonal quasicrystal was formed at 1000°C via a peritectic reaction between a liquid and a cubic Al 55 (Co, Cu) 45 phase. The decagonal quasicrystal crystallized as a primary p…
A third-order aberration theory has been developed for a plane-symmetric double-element optical system that consists of an extended source, two ellipsoidal gratings, and an image plane. The gratings can have any of the groove patterns producible by means of currently available technologies. Analytic formulas of spot d…
Abstract The adsorption of the metachromic dye acridine orange (AO) by Na-beidellite was investigated by visible spectroscopy. Different types of clay-AO association were identified from the appearance and location of absorption bands α or β. The colloidal properties were determined from curves of the absorbance vs .…
Extended X-ray absorption fine structure (EXAFS) spectra near the Si and Ge K-edge for SiO_2 and GeO_2 polymorphs were measured in transmission mode with synchrotron radiation at the Photon Factory, Tsukuba. The local structures and mean-square relative displacements were determined in \alpha-tridymite, \alpha-quartz…
Photoemission electron spectromicroscopy with synchrotron radiation has been used to study the correlation between the chemical surface composition and secondary electron yield from the surface of amorphous carbon films. Regions of about 4 μm diam were found which exhibited up to ten times higher secondary electron em…
Results of the investigations carried out on particulate silver films, deposited at a rate of 0.4 nm s -1 on poly(4-vinylpyridine) coated substrates held at temperatures in the range 440-490 K in a vacuum of 8 × 10 -6 Torr are reported in this paper. A morphological study by scanning electron microscopy and x-ray diff…
The inclusion of aza-heterocyclic di- or tri-amines in aromatic polyimide formulations can hinder the formation of high molecular weight products. Model studies using the reactions of pyridine, pyrimidine and triazine polyamines with phthalic anhydride and substituted phthalic anhydrides have shown that the combined d…
The specific heat of a single crystal of the layered perovskite ${\mathrm{La}}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ has been measured for $83<T<290\mathrm{K}.$ A high, narrow peak associated with the ferromagnetic ordering of the ${\mathrm{Mn}}^{3+}{\ensuremath{-}\mathrm{M}\mathrm{n}}^{4+}$…