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。
In this paper electrical properties of a novel linear low-density polyethylene synthesized with a catalyst, developed by our unique technique, were measured. It was found that this polyethylene had a higher volume resistivity, a higher breakdown strength and less spacer charge accumulation than conventional high-press…
For highest efficiency optical devices, it is desirable to form continuously graded device features. We describe a technique to produce such features through the fabrication of a continuous-tone grayscale mask and subsequent grayscale photolithography. The design of the mask fabrication process is outlined, including…
This paper aims to analyze general waste handling in Hungarian particleboard production and give solutions based on experimental researches. During our research reuse of waste in Hungarian particleboard production was studied. A wood industrial branch, which can be considered as both a waste “producer” and a waste “re…
In this paper, we report results of the first studies on the thermoelectric power (TEP) of the magnetic heusler alloy ${\mathrm{Ni}}_{2.19}{\mathrm{Mn}}_{0.81}\mathrm{Ga}$. We explain the observed temperature dependence of the TEP in terms of the crystal field splitting and compare the observed behavior to that of the…
Abstract There are three consecutive processes involved in extrusion foaming: extrusion (mixing and melting), cell initiation and cell growth, and cooling. Extrusion of polysaccharide‐based polymers with a single blowing agent is limited by cost, safety, and the various physicochemical requirements of the three proces…
Whiskers of β-SiC have been produced on the surfaces of polycrystalline SiC fibres by carbothermal synthesis. The growth of whiskers occurred simultaneously with siliconisation of the carbon fibres. The chemical composition, structure and morphology of the whiskers were studied using X-ray diffraction (XRD), Raman mic…
An n-type amorphous chalcogenide, In49S51, having a band gap of 1.9eV, has been found. The conductivity in as-prepared films was ∼10−4 S cm−1, which increased to 1 × 10−1 S cm−1 on post-annealing at 125°C in vacuum, accompanied by a reduction in the sulphur content of the films. TEM observations showed the amorphous n…
Abstract Gezielte Versuche zur Synthese neuer Halogenochalkogen(IV)‐Säuren führten mit Tellur und Brom zu den neuen Verbindungen [H 3 O(Benzo‐18‐Krone‐6)] 2 [Te 2 Br 10 ] ( 1 ) und [H 5 O 2 (Dibenzo‐24‐Krone‐8)] 2 [Te 2 Br 10 ] ( 2 ). Die [Te 2 Br 10 ] 2‐ ‐Anionen bestehen aus zwei kantenverknüpften verzerrten TeBr 6…
Experimental evidence indicates that nickel-base alloys fail in the presence of hydrogen by ductile intergranular fracture. The degradation mechanism involves void nucleation at grain boundary carbides and grain boundary decohesion. In this study, a micromechanical model is suggested to understand the interaction of v…
Commercial carbon NORIT and carbon xerogel samples were modified in an oxidizing atmosphere (wet and dry oxidation) and than subjected to physico-chemical characteristic, including temperature-programmed desorption (TPD) of CO and CO 2 , and spectroscopic analysis. Surface changes due to oxidation procedure were monit…
A phase-field model is proposed to describe epitaxial growth. In this model the motion of island boundaries of discrete atomic layers is determined by the time evolution of an introduced phase-field variable. We use formally matched asymptotic expansion to determine the asymptotic limit of vanishing interfacial thickn…
By means of a centrifugal casting method, high speed steel (HSS) rolls with excellent wear resistance have been manufactured. The hardness of the HSS rolls was 65–67 HRC, the range of hardness variation was smaller than 2 HRC and the impact toughness exceeded 15 J. The wear rate of the rolls was 2.5 × 10−4 mm t−1 of s…
AlN powders were coated with a protective layer at temperatures between 1150‐1450°C in a vacuum by the reaction with SiO vapor. The waterproof property of the coated AlN powders was studied. The composition of the protective coating varied with the coating temperature. Si‐coated AlN powders at 1200°C showed excellent…
Thin polymer films with thicknesses of tens of nanometers are studied extensively because they provide an ideal sample geometry for studying the effects of one-dimensional confinement on the structure, morphology, and dynamics of the polymer molecules and because they are used extensively in technological applications su…
A very high-current liner implosion experiment was conducted, using an explosive magnetic-compression generator (EMG) to deliver a peak current of 102 /spl plusmn/ 3 MA, to implode a 4.0-mm-thick aluminum liner. Analysis of experimental data showed that the inner surface of the liner had attained a velocity of between…
This study explores the possibility of overcoming the problem of hygroscopicity of ammonium nitrate by coating the particles with selected waterproofing materials. Gravimetric analysis of the samples of ammonium nitrate coated with eight different waterproofing materials, vis-a-vis, uncoated ammonium nitrate, were con…
In the ${\mathrm{Li}}_{1\ensuremath{-}x}{\mathrm{Na}}_{x}\mathrm{Ni}{\mathrm{O}}_{2}$ solid solutions, three different single-phase regions exist: for $x\ensuremath{\geqslant}0.9$, for $x\ensuremath{\approx}0.7$, and for $x\ensuremath{\leqslant}0.3$. Although the intermediate compound does not show the cooperative Jah…
The paper presents temperature behavior of the splay and bend elastic constants measured for n-hexyloxycyanobiphenyl and noctyloxycyanobiphenyl mixtures -a system exhibiting the re-entrant nematic phase. It was shown that singularities in the elastic properties of the system concern not only the nematic phase (the wel…
Precursors for zircon–carbon mixtures were made to coat fibers for ceramic‐matrix composites. Precursors were characterized using XRD, TGA, and DTA. Zircon formed from vanadium‐ or lithium‐doped precursors after heat treatments at ≥900°C in air, but it did not form at 1200°–1400°C in argon when large amounts of carbon…
Molecular sieve carbon (MSC) nanoparticles were successfully synthesized by carbonization of poly(furfuryl alcohol) (PFA) particles using silica as a temporary barrier to prevent irreversible aggregation of nanoparticles, and they showed good dispersibility in various organic solvents.