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。
Direct meso-alkylation of zinc(II) or metal-free 5-formyloctaethylporphyrin is achieved by use of Grignard reagents (such as MeMgBr, EtMgBr and PhCH2MgCl); regioselective attack at the 15-position of the prophyrin macrocycle is observed and affords the unexpected 5-formyl-15-alkylporphyrins by way of a phlorin interme…
Mn-Zn ferrites of composition, Mn/sub 0.57/Zn/sub 0.35/Fe/sub 2.08/O/sub 4/, have been prepared using citrate-gel and conventional mixed oxide processing routes. The magnetic properties and microstructures of these two ferrites were examined. Total power losses were measured and analyzed as a function of frequency, an…
A family of NMR solution structures of the growth factor receptor-bound protein 2 (Grb2) SH2 domain has been determined by heteronuclear multidimensional NMR. Proton, nitrogen, and carbon chemical shift assignments have been made for the SH2 domain of Grb2. Assignments were made from a combination of homonuclear two-d…
Carbon-13 nuclear magnetic resonance (13C-NMR) and 13C-enriched formaldehyde (13CH2O) were utilized to observe cross-linking in gelatin. Thus, when a 6% solution of gelatin in water was treated with 2000 ppm 13CH2O at 20 degrees C, the 15 hr 13C-NMR spectrum of the crosslinked gel showed peaks representing carbinolami…
Application of the new oxide ion conductor of composition La0.9Sr0.1Ga0.8Mg0.2O3 as electrolyte in solid oxide fuel cells is effective in enabling a decrease in the operating temperature.
Fibers of a poly(azomethine) having hydroxyl groups within the mesogenic core have been melt extruded from the nematic phase. The polymer obtained by condensation of 1,10-bis[(4-formyl-3-hydroxyphenyl)oxy]decane and 2-methyl-1,4-phenylenediamine has a T g of 54 °C and exhibits a nematic phase from 178 to 341 °C. Due t…
Abstract (Bi 1‐ x Sb x ) 2 Se 3 ( x = 0.0 to 0.2) single crystals were prepared using a modified Bridgman method. Measurements of the Hall coefficient R H , electrical conductivity σ and Seebeck coefficient α showed that incorporation of the antimony atoms into the Bi 2 Se 3 crystal lattice results in an increase in t…
Initial results of introducing La 2 O 3 into zinc titanate, a potential regenerable desulfurization sorbent, to reduce the spalling of zinc titanate and other similar type mixed metal oxide sorbents used in hot coal-derived fuel gas desulfurization are presented. Sorbents were tested in a bench scale high temperature−…
The paper describes kinetic investigations related to the development of a wet scrubbing process for SO 2 abatement from industrial waste gases: the oxidation of sulfur dioxide by tetravalent cerium in a sulfuric medium. Experiments carried out using two gas/liquid contactors and their interpretation could highlight t…
Abstract Historically, it has been difficult to directly obtain accurate air permeability measurements of open-structured textile fabrics. Although measurements can be made using a nonstandard pressure differential between the two fabric surfaces, this technique may not be reliable. An alternative method of determinin…
Abstract The experimental results of a study of the effect of supersaturation and temperature on the growth morphology of ammonium oxalate monohydrate [(NH 4 ) 2 C 2 O 4 H 2 O; AO] single crystals obtained from aqueous solutions at 30 and 40 °C and supersaturation up to 9% are presented. The observations are analysed…
New members of the Ln2–xSrxNiO4 ±δ(Ln = La, Nd, Sm and Gd) solid solution series have been synthesized for x1.0. The upper limit of x is ca. 1.6 for La and 1.67 for Nd, Sm and Gd. The tetragonal K2NiF4-type crystal structures of these phases have been Rietveld refined using X-ray powder diffraction data. Thermogravime…
Cobalt nitrosyl tetraphenylporphyrins CoT(p-X)PP(NO) (X = H, 1; OMe, 2; NO2, 3) substituted at the meso phenyl para position were prepared and the metal−NO interaction was probed using cyclic voltammetry and reflectance infrared spectroelectrochemistry. Electron-donating (OMe) and -withdrawing (NO2) groups were found…
(3-Hydroxybenzyl)hydrazine and methylhydrazine have been found to be potent slow-binding inhibitors of the pyridoxal 5-phosphate (PLP)-dependent enzyme gamma-aminobutyric acid aminotransferase (GABA-AT). Both compounds follow mechanism A (Morrison, J.F.; Walsh, C. T. Adv. Enzymol. 1988, 61, 201-301) which does not inv…
One of the major concerns in using Fiber Reinforced Composites (FRC) in applications that might be subjected to fire is their resistance to high temperature. Some of the fabrics used in FRC, such as carbon, are fire resistant. However, almost all the resins used cannot withstand temperatures higher than 200 degrees ce…
A layered ammonium zinc molybdate material was derived by a novel room-temperature chimie douce synthesis technique from a metastable mixed oxide prepared by calcination of a layered double hydroxide (LDH). The compound obtained, (NH 4 )HZn 2 (OH) 2 (MoO 4 ) 2, is highly crystalline and retains the rhombohedral symmet…
In the last few years there has been a considerable expansion in the application of Magnetic Force Microscopy (MFM). MFM images the stray field from the sample, offers excellent lateral resolution (/spl sim/10 nm) and requires minimal sample preparation. The interaction between the stray field from the sample and from…
In evaluating the performance of nonwoven fabrics, pore characteristics provide important information concerning fluid permeability, filtration and mechanical properties of the fabrics. This paper reports new approaches of measuring pore characteristics using image analysis. The image processing techniques for identif…
Simple tension tests were performed to investigate the load-elongation behavior of two geotextiles, a woven polyester and a nonwoven polypropylene, under monotonic and cyclic loading conditions. Creep tests under constant load were also performed in order to examine the time-dependent properties of both geotextiles. A…
Alkenyl succinic anhydride (ASA) is one of the reactive sizes used as cationic emulsions at wet-end of papermaking process. In order to make clear the mechanism of ASA sizing, structures of ASA components retained in handsheets were studied using model compounds and analytical techniques. The results of model experime…