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排序方式: 共有119条查询结果,搜索用时 15 毫秒
41.
Murari Mohon Roy Eiji Tomita Nobuyuki Kawahara Yuji Harada Atsushi Sakane 《International Journal of Hydrogen Energy》2009,34(18):7811-7822
This study investigated the effect of hydrogen content in producer gas on the performance and exhaust emissions of a supercharged producer gas–diesel dual-fuel engine. Two types of producer gases were used in this study, one with low hydrogen content (H2 = 13.7%) and the other with high hydrogen content (H2 = 20%). The engine was tested for use as a co-generation engine, so power output while maintaining a reasonable thermal efficiency was important. Experiments were carried out at a constant injection pressure and injection quantity for different fuel–air equivalence ratios and at various injection timings. The experimental strategy was to optimize the injection timing to maximize engine power at different fuel–air equivalence ratios without knocking and within the limit of the maximum cylinder pressure. Two-stage combustion was obtained; this is an indicator of maximum power output conditions and a precursor of knocking combustion. Better combustion, engine performance, and exhaust emissions (except NOx) were obtained with the high H2-content producer gas than with the low H2-content producer gas, especially under leaner conditions. Moreover, a broader window of fuel–air equivalence ratio was found with highest thermal efficiencies for the high H2-content producer gas. 相似文献
42.
This paper describes the crack propagation rate and the failure life in the biaxial low cycle fatigue test for a type 304 stainless steel at elevated temperatures. Macro crack propagation rates were observed for the tubular specimen in the push-pull and the reversed torsion tests. The crack propagation rate in both the tests was discussed in connection with the crack opening displacement in experiments and FEM analyses. The new equivalent stress derived from the FEM analysis was proposed so as to correlate the biaxial crack propagation rate. The equivalent stress well correlated not only the crack propagation rate but also the biaxial low cycle fatigue failure data. 相似文献
43.
T.M.B. CamposL.S. Cividanes D.D. BrunelliK.K. Sakane G.P. Thim 《Journal of the European Ceramic Society》2012,32(4):835-842
Mullite is one of the most important aluminosilicate due to its unique thermal properties. In this work, mullite was obtained by sol-gel process at low temperature using sodium metasilicate, water, aluminum nitrate and ethylene glycol. The samples were prepared with a volume ratio of ethylene glycol/water equal to 0/1, 1/1, 2/1 and 3/1. The ethylene glycol effect on mullite crystallization was studied by X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) and Differential Thermal Analysis (DTA). The sample prepared without ethylene glycol, the less homogeneous one, formed amorphous silica, spinel-phase and α-alumina at 1000 °C, and then crystallized mullite at 1200 °C, with an alumina molar fraction of 0.58. The other samples formed amorphous silica at 900 °C and crystallized mullite as the only crystalline phase at 1000 °C. However, the alumina content in mullite formula depends on the thermal treatment, reaching 0.58 at 1250 °C. 相似文献
44.
45.
The paper describes a mathematical model which predicts the meniscus shape and melt flow in an electromagnetic caster. Computations were carried out for the two types of caster (with and without a screen to shape the magnetic field) in commercial use. The dependence of meniscus shape on parameters such as inductor geometry, placement, current, and frequency, as well as screen properties and placement, was determined. Calculated velocities showed agreement with measurements of other investigators on a physical model and an actual caster. The effect of an auxiliary low frequency inductor on melt flow was also computed. 相似文献
46.
The distribution of substituent, i.e. oligo(ethylene oxide) groups, in hydroxyethylcelluloses having various values of molar substitution was determined by means of 13C nuclear magnetic resonance after the acetylation of hydroxyl groups both at the unsubstituted position in the anhydroglucose unit and at the substituent end position of the parent hydroxyethylcellulose. The acetyl carbonyl signal of the acetylated hydroxyethylcellulose samples was found to split into a triplet in DMSO-d6 at 100°C corresponding to the positions of acetyl groups (2, 3 or 6 overlapped with the substituent end) on the anhydroglucose unit. While in CDCl3 at 40°C, the acetyl carbonyl signal for the substituent end position was observed to be separated from those on the anhydroglucose unit. By combining these results, the distribution of the substituent groups was determined for a series of hydroxyethylcellulose samples of a wide range of molar substitution values. 相似文献
47.
Kiyokazu Imai Tomoo Shiomi Yasuyuki Tezuka Hiroko Itamochi Masamitsu Miya 《应用聚合物科学杂志》1993,48(9):1525-1529
Separability of SO2 from mixtures of SO2 and N2 gases was studied for membranes of poly(vinyl alcohol) (PVA) and cellulose modified with methyl, ethyl, t-butyl, and phenyl vinyl sulfoxides. Of these sulfoxide-modified polymers, the phenyl vinyl sulfoxide-modified PVA membranes were found to give the best separation of SO2. In the phenyl vinyl sulfoxide modified PVA membranes, the permeability coefficient of SO2 increased with sulfoxide content while separability of SO2 was maximum at a sulfoxide content of 23.5 mol %; the separation factor of SO2 was about 170 at this sulfoxide content. © 1993 John Wiley & Sons, Inc. 相似文献
48.
Y Kinami I Miyazaki M Kawamura M Sugii Y Sakane 《Canadian Metallurgical Quarterly》1976,11(2):123-132
The anticancer drugs, like 5-Fluorouracil, which are believed to interfere with enzyme protein synthesis in the exocrine cells of pancreas were administered intravenously to fifteen patients with various pancreatic diseases. The improvement of clinical symptoms and the diminution of serum and urinary amylase levels were observed in four cases with acute pancreatitis and two cases with chronic relapsing pancreatitis. The postoperative complications, namely the formation of pancreatic fistula and the rupture of pancreaticojejunostomy, or the aggravation of concomitant pancreatitis were not observed in three cases with benign surgical pancreatic diseases and six cases with pancreatic carcinoma. Furthermore, the diminution of amylase and protein output of pancreatic juice from canulae inserted into pancreatic ducts were observed. 相似文献
49.
Kiyotaka Shibata Kiyokazu Kasai Toshihiro Okabe Kouji Saito 《Journal of Porous Materials》1995,2(4):287-290
Woodceramics obtained by carbonizing woody materials are new carbon materials recently developed for industrial use. They are porous, light, hard and cheap to produce and have heat and corrosion resistance. They are being considered for applications in various fields. We investigated the dependence of the electrical resistivity of Woodceramics at temperatures between 100 K and 300 K, and considered the conduction mechanism of Woodceramics which are porous conductors. The electrical resistivity of Woodceramics decreases as sintering temperature increases. It varies over a wide range. And the resistivity dependence on the temperature of Woodceramics is similar to that of a semiconductor. We propose that the semiconducting behavior is caused by an energy gap decrease which depends on the sintering temperature, as a result of change in size of the graphite micro-crystallites in glassy carbon which is present in Woodceramics. 相似文献
50.
Polymer‐Stabilized Micropixelated Liquid Crystals with Tunable Optical Properties Fabricated by Double Templating 下载免费PDF全文
Yuji Sasaki Motoshi Ueda Khoa V. Le Reo Amano Shin Sakane Shuji Fujii Fumito Araoka Hiroshi Orihara 《Advanced materials (Deerfield Beach, Fla.)》2017,29(37)
Self‐organized nano‐ and microstructures of soft materials are attracting considerable attention because most of them are stimuli‐responsive due to their soft nature. In this regard, topological defects in liquid crystals (LCs) are promising not only for self‐assembling colloids and molecules but also for electro‐optical applications such as optical vortex generation. However, there are currently few bottom‐up methods for patterning a large number of defects periodically over a large area. It would be highly desirable to develop more effective techniques for high‐throughput and low‐cost fabrication. Here, a micropixelated LC structure consisting of a square array of topological defects is stabilized by photopolymerization. A polymer network is formed on the structure of a self‐organized template of a nematic liquid crystal (NLC), and this in turn imprints other nonpolymerizable NLC molecules, which maintains their responses to electric field and temperature. Photocuring of specific local regions is used to create a designable template for the reproducible self‐organization of defects. Moreover, a highly diluted polymer network (≈0.1 wt% monomer) exhibits instant on–off switching of the patterns. Beyond the mere stabilization of patterns, these results demonstrate that the incorporation of self‐organized NLC patterns offers some unique and unconventional applications for anisotropic polymer networks. 相似文献