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。
This paper describes the results of accelerated particulate fouling tests performed on different enhanced tubes and a plain tube. The key purpose of the tests was to investigate particulate fouling in practical heat exchanger systems where a mixture of particles exists in a flowing water stream. The applications consi…
The new lanthanide–hydrogen–transition metal compounds [{[PMe3)3WH5}2Yb·L3] and [{(η-C5H5)2NbH2}2Yb·L3], where L3=(MeOCH2CH2)2O, are prepared and their crystal structures determined.
Several clean agricultural screens were tested to determine force and static pressure drop across the screen created by airflow through the screen. Wind pressures on screens and static pressure drop across screens increased exponentially with increases in apparent air velocity. Fabric density, configuration, and dimen…
The hydrolytic behaviour of iron(III) has been investigated. The infrared spectrum of the sulfate salt of a hydrolysed iron(III) solution was found to match that of a gallium sulfate that had been shown through magic angle spinning NMR spectroscopy in combination with powder X-ray diffraction studies to contain the Ga…
Water vapour was used as a diffusional probe to study segmental mobility in hydrogen-bonded polymer blends. Modified polystyrenes containing 4-hydroxystyrene as comonomer units were blended with poly(methyl methacrylate). The diffusion coefficient of water decreased with increasing concentration of the diffusant. Clus…
A new direct-methods procedure has been devised which consists of phase refinement via the minimal function, R(phi), alternated with Fourier summation and real space filtering. All phases are initially assigned values by computing structure factors for a randomly positioned set of atoms. These phases are then refined…
Currently, there are a large variety of degradable polymers available for use in surgery, which are generally based on blends and copolymers of poly(L-lactide) (PLLA) and poly(L-glycolide) (PGA). The major demand for these materials is for suturing of wounds, but the materials are also being developed for use in ortho…
The (R4N)2[Ni(tdas)2] complexes (tdas2–= 1,2,5-thiadiazole-3,4-dithiolate and R = Bu, Et) are prepared and characterized by X-ray crystallography, which reveals differences in their structure dependant on the size of the R4N cation.
Partial discharge measurement is an important means of assessing the condition and integrity of insulation systems in high voltage power apparatus. Commercially available partial discharge detectors display them as patterns by an elliptic time base. Over the years, experts have been interpreting and recognising the na…
The synthesis and characterization of side-chain liquid-crystalline polysiloxanes based on 4′-cyanobiphenyl-4-yl 2-(2-allyloxyethoxy)-4-(4-methoxybenzyloxy)benzoate (11-1), 4′-cyanobiphenyl-4-yl 2-[2-(2-allyloxyethoxy) ethoxy]-4-(4-methoxybenzyloxy) benzoate (11-2) and 4′-cyanobiphenyl-4-yl 2-{2-[2-(2-allyloxyethoxy)e…
The effect of additives on carbothermal reduction-nitridation was investigated for the preparation of AlN powders from the Al2O3-C-N2 system. According to the role of additives in nitridation, they were divided into three categories: “promote”, “have no effect” and “disturb”. In particular, CaF2 was an excellent nitri…
The reaction of the hydrated β-diketonate complexes [Ln(tmhd)3(H2O)] with triglyme (2,5,8,11-tetraoxadodecane, L1) in hexane yielded the eight-coordinate triglyme-bridged dimeric complexes, [{Ln(tmhd)3}2L1](Ln = Eu 1 or Tb 2; tmhd = ButCOCHCOBut). In contrast, the reaction of [La(tmhd)3(H2O)] with tetraglyme, (2,5,8,1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer brush in contact with a mixture of solventsJ. F. MarkoCite this: Macromolecules 1993, 26, 2, 313–319Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue 1 January 1993https://pubs.acs.org/doi/10.1021/ma00054a010https…
All articles of this category Syntheses of two novel classes of water soluble phthalocyanines substituted with propionic acid or O-ethyl, methyl-phosphonic acid groups are described. These compounds have applications in the field of photodynamic inactivation of cancer cells and viruses.
The synthesis and characterization of cyclic main chain liquid-crystalline oligomers based on 1-(4-hydroxy-4′-biphenyl)-2-(4-hydroxyphenyl)butane (TPB) with 1,7-dibromoheptane (TPB-7(c)] are described. These oligomers were synthesized by the phase transfer catalysed polyetherification of TPB with 1,7-dibromoheptane un…
Shear-induced homogenization of semidilute solutions of polybutadiene (PB) and polystyrene (PS) with dioctylphthalate as a solvent was studied as a function of temperature T, polymer compositions at a fixed total polymer concentration of 3.3 wt%. The drop of homogenization temperature ΔTc(S) as measured in the increas…
The reaction of KCa[Cr(C2O2S2)3]·6H2O (C2O2S2= dithiooxalate) and [NiL][ClO4]2(L = racemic 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane) in the 1:3 molar ratio gave a chromium(III)trinickel(II) complex [Cr(C2O2S2)3(NiL)3][ClO4]3. It crystallizes with two dimethylformamide and two PriOH molecules in the…
Abstract The mechanically induced changes in structure and magnetic properties of zinc ferrite were investigated by using the Rietveld analysis and Mössbauer spectroscopy. The formation of the spin arrangement in mechanically activated zinc ferrite is connected with a redistribution of the cations in the close‐packed…
Electrical conductivity and the Seebeck coefficient of compositions in the system Y[sub 1-y]Ca[sub y]MnO[sub 3] and La[sub 1-y]Ca[sub y]MnO[sub 3] were studied to determine the mechanism of electrical transport and defect structure. Electrical conduction appeared to occur via a small polaron hopping mechanism for comp…
Recent versions of PSPICE, a personal computer implementation of the SPICE circuit simulation computer software program, have the capability of simulating the hysteresis loops of magnetic materials. In order to model the hysteresis loop of a particular manufacturer's magnetic core material, the values of five paramete…