Materials Literature
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Saturation effects in transformers and shunt reactors can produce harmonics in power systems. Their magnitude can sometimes be found with an electromagnetic transients program, by going from an approximate linear ac steady-state solution directly into a transient simulation in which the nonlinear effects are included.…
A new analytical function is proposed for absorption correction. It is expressed by surface harmonics with polar angles that specify the primary and secondary beam directions. This function has an advantage over Fourier expansion because it is rotationally invariant. Two empirical, methods are used to determine the ex…
Description Emphasizes toughness as related to damage tolerance of advanced composites. Discusses the problems researchers face in characterizing and analyzing the complex failure mechanisms associated with stress concentration and delaminations. Contains several papers on multi-dimensionally reinforced materials in t…
A Wien Filter electron spectrometer has been successfully combined with a dedicated scanning transmission electron microscope (STEM) to obtain an energy resolution of 140 meV with a specimen collection semiangle of 25 mR at 100 keV. A cold-field emission electron source is used to produce a 0.35–10-nm-size electron be…
We show explicitly that, in a realistic model of diffusion-controlled dendritic solidification, Ivantsov's continuous family of steady-state needle crystals is destroyed by the addition of surface tension. Our starting point is the exact integro-differential equation for the one-sided model, in two dimensions, in a mo…
Abstract Commercial high density polyethylene and polyamide‐6 (PA) resins were melt blended in the Brabender Plasticorder twin‐screw extruder. The blends containing zero to 30 wt percent of polyamide‐6 were examined in dynamic and steady state shear at 150, 200, and 250°C. The Theological test results are discussed in…
Electron-energy-loss spectra of all core-level absorption edges of MgO microcrystals were recorded in the transmission mode using 60-keV electrons. The low-noise signal attained at a resolution of 0.5 eV reveals details of fine structure in the near-edge region. The spectra obtained were analyzed by the application of…
The ability of 21 nonencapsulated and 15 encapsulated coagulase-negative staphylococci (CNS) to adhere to xylene in xylene-water emulsions and to fluorinated poly(ethylenepropylene) (FEP) films revealed remarkable differences. Nonencapsulated CNS strains adhered well to FEP, whereas their adherence to xylene ranged wi…
A new actuator of a joint mechanism is proposed, composed of two TiNi alloy wires. First, the static and dynamic properties of the TiNi alloy wire that were not known are analyzed. Then the mathemati cal model of the actuator is induced. Next, the control sys tems of the actuator are synthesized by pulse width modu la…
Fabrication de composites par infiltration et depot chimique en phase vapeur de SiC dans une structure fibreuse de SiC. L'utilisation d'un gradient thermique et d'un ecoulement gazeux force permet de reduire la duree d'infiltration. On etudie les proprietes mecaniques de ces composites
Si(001)-2×1 single-domain structure has been observed by reflection high-energy electron diffraction (RHEED) after a substrate annealing at a temperature of 1000°C for 20 min. This implies surface steps have been changed from monatomic layer to biatomic layer height by the annealing. It was found that the single-domai…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBis axially coordinated (phthalocyaninato)ruthenium(II) compoundsWolfram Kobel and Michael HanackCite this: Inorg. Chem. 1986, 25, 1, 103–107Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Published inissue 1 January 1986https://pubs.acs…
Type V collagen and type I collagen were obtained from human placentas by pepsin treatment, followed by salt fractionation. The precipitates formed at 37 degrees C from a mixed solution of type V collagen and type I collagen, reacted with antibodies to either type V collagen or type I collagen. The precipitates seen b…
We examined collagen materials for soft tissue augmentation [Zyderm Collagen Implant (ZCI), glutaraldehyde cross-linked (GAX) collagen, and Koken Atelocollagen (Atelocollagen)]; hemostatic collagens [Gelfoam Gelatin Powder (Gelfoam), Avitene Microfibrillar Collagen Hemostat (Avitene), and Collastat Collagen Hemostat (…
The two-dimensional random-parking limit is the area fraction of a plane covered by circles when the circles are added sequentially in a random way, without overlap, until no further circles can be added. As yet, no analytical solution exists for this limit. Several computer simulations and one experimental study have…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA theoretical survey of unsaturated or multiply bonded and divalent silicon compounds. Comparison with carbon analogsB. T. Luke, J. A. Pople, M. B. Krogh-Jespersen, Y. Apeloig, M. Karni, J. Chandrasekhar, and Paul v. R. SchleyerCite this: J. Am. Chem. Soc. 1986, 108, 2, 270–…
The behaviour of large air-insulated structures subjected to complex multiple-peak surge overvoltages is influenced by the presence of already established leader overvoltages in influenced by the presence of already established leader development in the space. The decay processes of a positive leader channel following…
残油FCC触媒を選定する際の指針を得る目的で, 残油を分解した時の生成物の選択性と触媒の性状との関係について検討した。スチーム処理により疑似平衡化した三種類の市販触媒についてパイロットテストを実施した結果, 生成物の選択性には触媒マトリックスの細孔分布が大きく影響していることが明らかになった。これは, 残さ留分の分解は, 液状でマトリックスの細孔内に拡散し, 細孔表面上で比較的小さな分子へ予備分解したのちに, ゼオライト上で最終生成物へと分解するためである。残油FCCにおいては, 原料油の残さ留分の平均分子サイズに対応した細孔径範囲に多くの細孔が分布しているような触媒を選定する必要がある。
The lipid, fatty acid, glucan, protein, and chlorophyll contents of nutrient-starved and nutrient-stressed cells of Cyclotella meneghiniana Kütz. were investigated in batch and semicontinuous culture experiments, respectively. In batch culture experiments, cells were removed from nutrient-replete media, resuspended in…
Article The Diatom Genus Thalassiosira Cleve in Gulf Stream Warm Core Rings: Taxonomy, with T. intrannula and T. lineoides, spp. nov. was published on January 1, 1986 in the journal Botanica Marina (volume 29, issue 1).