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排序方式: 共有197条查询结果,搜索用时 15 毫秒
41.
Yuji Minoura Shinzo Yamashita Hiroshi Okamoto Tadao Matsuo Michiaki Izawa Shun-Ich Kohmoto Yuji Minoura Shinzo Yamashita Hiroshi Okamoto Tadao Matsuo Michiaki Izawa Shun-Ich Kohmoto 《应用聚合物科学杂志》1978,22(7):1817-1844
The structure–property relationships of polyurethane elastomer derived from liquid hydroxylterminated polybutadiene/low molecular weight aliphatic diol/diisocyanate system were studied. The effects of the amount of low molecular weight diol on the mechanical properties of elastomer were discussed on the basis of the results of the stress–strain curve, swelling, dynamic viscoelasticity, x-ray diffraction, and others. It was found that some particular combinations of low molecular weight diol and diisocyanate specifically affect the properties of elastomers. When the mechanical properties of the elastomers were plotted against the number of methylene carbons in low molecular weight diol, the characteristic zigzag patterns were obtained. These patterns were explained by the difference in the packing and the dependence of the ability of intermolecular hydrogen bonding on whether the number of the methylene carbons was even or odd. This assumption was confirmed by x-ray diffraction. 相似文献
42.
A straight-bladed vertical axis wind turbine with a directed guide vane row — Effect of guide vane geometry on the performance — 总被引:2,自引:0,他引:2
Manabu Takao Hideki Kuma Takao Maeda Yasunari Kamada Michiaki Oki Atsushi Minoda 《热科学学报(英文版)》2009,18(1):54-57
The objective of this study is to show the effect of guide vane geometry on the performance. In order to overcome the disadvantages
of vertical axis wind turbine, a straight-bladed vertical axis wind turbine (S-VAWT) with a directed guide vane row has been
proposed and tested by the authors. According to previous studies, it was clarified that the performance of the turbine can
be improved by means of the directed guide vane row. However, the guide vane geometry of S-VAWT has not been optimized so
far. In order to clarify the effect of guide vane geometry, the effects of setting angle and gap between rotor blade and guide
vane on power coefficient and starting characteristic were investigated in the experiments. The experimental study of the
proposed wind turbine was carried out by a wind tunnel. The wind tunnel with a diameter of 1.8m is open jet type. The wind
velocity is 8 m/s in the experiments. The rotor has three straight blades with a profile of NACA0018 and a chord length of
100 mm, a diameter of 0.6 m and a blade height of 0.7 m. The guide vane row consists of 3 arc plates. 相似文献
43.
Effect of organic solvents and ionic liquids on resolution of 2‐epoxyhexane by whole cells of Rhodotorula glutinis in a two‐liquid phase system 下载免费PDF全文
44.
45.
Yuka Tsuji Mizuki Kuramochi Hossain M. Golbar Takeshi Izawa Mitsuru Kuwamura Jyoji Yamate 《International journal of molecular sciences》2020,21(23)
Overdose of acetaminophen (APAP), an antipyretic drug, is an important cause of liver injury. However, the mechanism in the rat model remains undetermined. We analyzed APAP-induced hepatotoxicity using rats based on M1/M2-macrophage functions in relation to damage-associated molecular patterns (DAMPs) and autophagy. Liver samples from six-week-old rats injected with APAP (1000 mg/kg BW, ip, once) after 15 h fasting were collected at hour 10, and on days 1, 2, 3, and 5. Liver lesions consisting of coagulation necrosis and inflammation were seen in the affected centrilobular area on days 1 and 2, and then, recovered with reparative fibrosis by day 5. Liver exudative enzymes increased transiently on day 1. CD68+ M1-macrophages increased significantly on days 1 and 2 with increased mRNAs of M1-related cytokines such as IFN-γ and TNF-α, whereas CD163+ M2-macrophages appeared later on days 2 and 3. Macrophages reacting to MHC class II and Iba1 showed M1-type polarization, and CD204+ macrophages tended to be polarized toward M2-type. At hour 10, interestingly, HMGB1 (representative DAMPs) and its related signals, TLR-9 and MyD88, as well as LC3B+ autophagosomes began to increase. Collectively, the pathogenesis of rat APAP hepatotoxicity, which is the first, detailed report for a rat model, might be influenced by macrophage functions of M1 type for tissue injury/inflammation and M2-type for anti-inflammatory/fibrosis; particularly, M1-type may function in relation to DAMPs and autophagy. Understanding the interplayed mechanisms would provide new insight into hepato-pathogenesis and contribute to the possible development of therapeutic strategies. 相似文献
46.
Satoshi Takesono Masami Yasukawa Masayuki Onodera Kohji Izawa Kazuaki Yamagiwa Akira Ohkawa 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1993,56(1):97-107
For a bubble column (BC) treating foaming liquids, the characteristics of a rotating-disk mechanical foam-breaker (MFRD) fitted to the BC were examined. The foaming behaviour of the BC and the foam-breaking behaviour of the MFRD under various operating conditions were related to the changes in liquid hold-up in the foam. The gas hold-up in a mechanical foam-control system (MFS) with the MFRD was confirmed to be greater than the gas hold-up in a non-foaming system (NS) including antifoam agent (AF). Comparison of the volumetric mass transfer coefficient between the MFS and the non-foaming system, in terms of the specific power input, also demonstrated the superiority of mechanical foam control for oxygen transfer performance. 相似文献
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49.
H Wanifuchi M Takeshita N Aoki T Kawamata K Shiokawa M Izawa M Kagawa K Takakura 《Canadian Metallurgical Quarterly》1996,36(2):87-90
The effect of domestically-manufactured excimer laser with adjunctive balloon angioplasty in achieving revascularization and reduction of residual stenosis was assessed. 20 femoral arteries with thrombosis and occlusion from 12 dogs were subject to angiography. At first excimer laser angioplasty was done followed by balloon angioplasty. The diameter and residual stenosis of revascularized vessel were measured. The result showed that 17 out of 20 vessels (85%) were revascularized. The diameter of revascularized vessel by excimer laser were 1.22 +/- 0.14 mm, while residual stenoses were 54% +/- 5%. After adjunctive balloon angioplasty the diameter and residual stenoses were 2.04 +/- 0.16 mm and 20% +/- 7% respectively (P < 0.05 and P < 0.01). Complication in form of vasoperforation occurred in 3/20 vessels (15%). It is concluded that China- manufactured excimer laser angioplasty is effective when used for revascularization. While the reduction of narrowing and residual stenoses was enhanced after adjunction of balloon angioplasty. This method can be employed in treating peripheral occlusive disease effectively and safely. 相似文献
50.
Y Okada T Yokoyama Y Jinno T Kashiwabara T Izawa H Fukushima N Ogawa 《Canadian Metallurgical Quarterly》1993,241(2-3):177-181
The characteristics of KRN2391 (N-cyano-N'-(2-nitroxyethyl)-3-pyridinecarboximidamide monomethansulfonate) and its phenethyl and 2-hydroxyethyl derivatives (Ki1769 and Ki3315) were studied in isolated porcine coronary arteries. KRN2391, Ki1769 and Ki3315 produced concentration-dependent relaxation of coronary arteries contracted by 25 mM KCl and the order of relaxant potency was KRN2391 > Ki1769 > Ki3315. At the maximum effect, KRN2391 produced nearly complete relaxation but Ki1769 produced about 66% relaxation. The maximum effect of Ki3315 could not be obtained because of its solubility. The relaxation induced by KRN2391 was antagonized by glibenclamide and methylene blue but relaxations caused by Ki1769 and Ki3315 were antagonized by glibenclamide alone. The antagonistic effect of glibenclamide on Ki1769- and Ki3315-induced relaxations was more potent than that on KRN2391-induced relaxation. KRN2391 induced relaxation of coronary arteries contracted by 40 mM KCl in a concentration-dependent manner but the effect of KRN2391 was smaller against 40 mM KCl-induced contractions than against 25 mM KCl-induced contractions. Ki1769 had almost no effect on coronary arteries contracted by 40 mM KCl. These results suggest that pyridinecarboximidamide derivatives which do not possess a nitroxyl group have vasodilating ability based on a K+ channel opening action. 相似文献