检索结果-南通市图书馆

Analysis of the Tracer Diffusion Phenomena through Cracks in the Porous Media by Means of X-Ray CT

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Materials Sciences and Applications 2013年第8期4卷 18-31页

作者： akira sato Graduate School of Science and Technology Kumamoto University Kumamoto Japan

The migration process of contamination materials in the porous rock mass was visualized and analyzed by X-ray CT image data. In this study, Kimachi sandstone, which had approximately 26% porosity, was used as a rock sample. Here two cases of diffusion phenomena were analyzed. One is the case that solute diffuses into the porous rock mass from the crack surfaces, and it simulates the contamination process of rock mass. Another is the case that the solute diffuses out of the porous rock mass, and it simulates the process that the contamination materials spread from highly contaminated sources. It was found that the diffusion phenomena were clearly visualized by X-ray CT method. By introducing the parameter, coefficient of tracer density increment α, quantitative analysis of tracer density became possible, and the relation between the density distribution of tracer and the crack apertures and the relation between the density distribution and porosity distribution became clear.

关键词： Porous Rock Advection Diffusion Contamination Crack X-Ray CT

Triptolide,a Novel Diterpenoid Triepoxide From Tripterygium wilfordii Hook.f., Suppresses the Production and Gene Expression of Pro-Matrix Metalloproteinases 1 and 3 and Augments Those of Tissue Inhibitiors of Metalloproteinases 1 and 2 in Human

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国实验方剂学杂志 2002年第S1期8卷 -页

作者： Takashi sato akira Ito

Ｍｅｔｈｏｄｓ.Ｈｕｍａｎｓｙｎｏｖｉａｌｆｉｂｒｏｂｌａｓｔｓａｎｄｍｏｕｓｅｍａｃｒｏｐｈａｇｅｓｗｅｒｅｃｕｌｔｕｒｅｄｗｉｔｈｉｎｔｅｒｌｅｕｋｉｎ 1α(ＩＬ 1α)ｏｒｌｉｐｏｐｏｌｙｓａｃｃｈａｒｉｄｅ(ＬＰＳ...

Ｍｅｔｈｏｄｓ.Ｈｕｍａｎｓｙｎｏｖｉａｌｆｉｂｒｏｂｌａｓｔｓａｎｄｍｏｕｓｅｍａｃｒｏｐｈａｇｅｓｗｅｒｅｃｕｌｔｕｒｅｄｗｉｔｈｉｎｔｅｒｌｅｕｋｉｎ 1α(ＩＬ 1α)ｏｒｌｉｐｏｐｏｌｙｓａｃｃｈａｒｉｄｅ(ＬＰＳ)ｉｎｔｈｅｐｒｅｓｅｎｃｅｏｒａｂｓｅｎｃｅｏｆｔｒｉｐｔｏｌｉｄｅ .ＴｈｅｐｒｏｄｕｃｔｉｏｎｏｆｐｒｏＭＭＰｓ 1ａｎｄ 3 ,ＴＩＭＰｓ 1ａｎｄ 2 ,ｃｙｃｌｏｏｘｙｇｅｎａｓｅ 1 (ＣＯＸ 1 )ａｎｄＣＯＸ 2 ,ｐｒｏｓｔａｇｌａｎｄｉｎＥ2 (ＰＧＥ2 ) ,ＩＬ 1 β ,ａｎｄＩＬ 6ｗａｓａｓｓａｙｅｄｂｙＷｅｓｔｅｒｎｂｌｏｔａｎａｌｙｓｉｓａｎｄｅｎｚｙｍｅｌｉｎｋｅｄｉｍｍｕｎｏｓｏｒｂｅｎｔａｓｓａｙ .ＧｅｎｅｅｘｐｒｅｓｓｉｏｎｏｆｐｒｏＭＭＰｓ 1ａｎｄ 3 ,ＴＩＭＰｓ 1ａｎｄ 2 ,ＣＯＸ 1ａｎｄＣＯＸ 2 ,ＩＬ 1α ,ＩＬ 1 β ,ｔｕｍｏｒｎｅｃｒｏｓｉｓｆａｃｔｏｒα(ＴＮＦα) ,ａｎｄＩＬ 6ｗａｓａｌｓｏｍｏｎｉｔｏｒｅｄｂｙＮｏｒｔｈｅｒｎｂｌｏｔａｎａｌｙｓｉｓａｎｄｒｅｖｅｒｓｅｔｒａｎｓｃｒｉｐｔａｓｅｐ...

关键词：

Evaluation of Preservation Effect by Aquo-Siloxane Method towards Water Permeation and Material Diffusion into Porous Rocks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Materials Sciences and Applications 2017年第6期8卷 419-435页

作者： akira sato Minami Egashira Michiyo Obata Graduate School of Advanced Science and Technology Kumamoto University Kumamoto Japan Kyushu Research Institute for Cultural Properties Inc. Kumamoto Japan

Various kinds of heritages, such as architectures, statues, grave posts and towers, are made by stone, and they are facing the crisis of weathering. Therefore, it is necessary to give appropriate treatments to keep them in good conditions. Kyushu Research Institute for Cultural Properties Inc. and Kumamoto University introduced a new method, Aquo-Siloxane Method, in order to protect the stone heritages. In this study, preservation effect by Aquo-Siloxane method towards water permeation and material diffusion was verified. Here one-dimensional permeation and diffusion tests were conducted, and the intrinsic permeability and diffusion coefficient of rock samples with and without Aquo-Siloxane treatments were evaluated. As rock samples, 3 types of sandstones and concrete were applied. It was found that the permeability decreased to less than 1/10 to 1/100 of without Aquo-Siloxane treatment, and that the effect gradually developed during more than one year. One-dimensional diffusion tests were also conducted, and the diffusion process in rock samples are visualized by X-ray CT scanner system. It was confirmed internal structures of samples are clearly visualized, and that the diffusion process was also visualized as X-ray CT images. In order to extract the necessary information due to diffusion, image subtraction method was applied to image data. Then, by comparing obtained CT image data and numerical solutions, diffusion coefficients of rock samples with and without Aquo-Siloxane treatments were evaluated. As a result, diffusion coefficients also became smaller by applying Aquo-Siloxane treatments. It is revealed that material movement due to diffusion was also efficiently suppressed by applying Aquo-Siloxane method. Finally, Aquo-Siloxane method was applied to a stone heritage. It was found that no more chippings and cracks were observed and that the heritage has been kept in good condition for at least four years.

关键词： Aquo-Siloxane Method Stone Heritages Water Permeation Diffusion X-Ray CT

Efficacy and safety of dual therapy with daclatasvir and asunaprevir in elderly patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Hepatology 2017年第11期9卷 544-550页

作者： Kazuo Tarao Katsuaki Tanaka Akito Nozaki akira sato Toshiya Ishii Hirokazu Komatsu Takaaki Ikeda Tatsuji Komatsu Shozo Matsushima Kenji Oshige Tarao’s Gastroenterological Clinic Gastroenterological Center Medical Center Yokohama City University Division of Gastroenterology Department of Internal Medicine St. Marianna University Yokohama City Seibu Hospital Department of Gastroenterology Yokohama Municipal Citizen’s Hospital Department of Gastroenterology Yokosuka General Hospital Uwamachi Department of Clinical Research National Hospital Organization Yokohama Medical Center Yokohama National University Center for Health Service Sciences

To survey the efficacy and safety of dual therapy with daclatasvir and asunaprevir in the elderly hepatitis C virus (HCV) patients multicentricity. METHODSInterferon-ineligible/intolerant patients and non-responders to previous pegylated-interferon/ribavirin therapy with chronic HCV genotype 1b infection were enrolled. Child B, C cirrhotic patients were excluded. Patients received oral direct acting antiviral treatment consisting of 60 mg daclatasvir once daily plus 200 mg asunaprevir twice daily for 24 wk. We divided the patients into two groups of 56 elderly patients (≥ 75 years-old) and 141 non-elderly patients (24). In the former, 1.8% experienced viral breakthrough, as compared with 3.5% in the latter (not significant). Adverse events occurred in 55.4% of the former and 56.0% of the latter. In the former, 7 cases (12.5%) were discontinued due to adverse events, and in the latter 9 cases were discontinued (6.4%, not significant). CONCLUSIONDual therapy with daclatasvir and asunaprevir achieved the same high rates of SVR24 in HCV elderly patients without more adverse events than in the non-elderly patients.

关键词： Asunaprevir Chronic hepatitis Daclatasvir Dual oral therapy Elderly patients Hepatitis C virus infection Hepatitis C virus Liver cirrhosis

Excessive portal flow causes graft failure in extremely small-for-size liver transplantation in pigs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第44期11卷 6954-6959页

作者： Hong-Sheng Wang Nobuhiro Ohkohchi Yoshitaka Enomoto Masahiro Usuda Shigehito Miyagi Takeshi Asakura Hiroo Masuoka Takashi Aiso Keisuke Fukushima Tomohiro Narita Hideyuki Yamaya Atsushi Nakamura satoshi Sekiguchi Naoki Kawagishi akira sato Susumu satomi Division of Advanced Surgical Science and Technology Department of Surgery

AIM： To evaluate the effects of a portocaval shunt on the decrease of excessive portal flow for the prevention of sinusoidal microcirculatory injury in extremely smallfor-size liver transplantation in pigs. METHODS： The right lateral lobe of pigs, i.e. the 25% of the liver, was transplanted orthotopically. The pigs were divided into two groups： graft without portocaval shunt （n = 11） and graft with portocaval shunt （n = 11）. Survival rate, portal flow, hepatic arterial flow, and histological findings were investigated. RESULTS： In the group without portocaval shunt, all pigs except one died of liver dysfunction within 24 h afcer transplantation. In the group with portocaval shunt, eight pigs survived for more than 4 d. The portal flow volumes before and after transplantation in the group without portocaval shunt were 118.2±26.9 mL/min/100 g liver tissue and 270.5±72.9 ml./min/100 g liver tissue, respectively. On the other hand, in the group with portocaval shunt, those volumes were 124.2±27.8 ml./ min/100 g liver tissue and 42.7±32.3 mL/min/100 g liver tissue, respectively （P〈0.01）. As for histological findings in the group without portocaval shunt, destruction of the sinusoidal lining and bleeding in the peri-portal areas were observed afl：er reperfusion, but these findings were not recognized in the group with portocaval shunt. CONCLUSION： These results suggest that excessive portal flow is attributed to post transplant liver dysfunction after extreme small-for-size liver transplantation caused by sinusoidal microcirculatory injury.

关键词： Hyperperfusion syndrome Liver regeneration Portocaval shunt Postoperative liver dysfunction Sinusoidal microcirculatory injury Small-for-size liver transplantation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

日本超级钢材研究项目(STX-21)

中国冶金 2001年第2期11卷 36-39页

作者： akira sato 日本国家金属研究院

1 前言根据"科技基本法(1995)”和"科技基本计划(1996)”,为了处理社会和经济上的需要以及基于将日本发展成为科技创造性国家的目标,日本政府已经决定推进R&D活动.发明新颖和革新的技术、创造新工业、实现有活力且富裕的生活、解决全球... 详细信息

1 前言根据"科技基本法(1995)”和"科技基本计划(1996)”,为了处理社会和经济上的需要以及基于将日本发展成为科技创造性国家的目标,日本政府已经决定推进R&D活动.发明新颖和革新的技术、创造新工业、实现有活力且富裕的生活、解决全球问题以及促进健康都是上述所提及的社会和经济上的需要.

关键词：日本超级钢材研究项目 STX-21 R&D

Synthesis and Characterization of CaPd<sub>3</sub>O<sub>4</sub>Crystals

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Crystallization Process and Technology 2012年第1期2卷 16-20页

作者： Hiroaki Samata satoshi Tanaka Soichiro Mizusaki Yujiro Nagata Tadashi C. Ozawa akira sato Kosuke Kosuda 不详

A new method for the crystal growth of alkaline-earth palladate CaPd3O4 was developed. The crystals were synthesized on a voltage-applied electrode in a molten chloride solvent. The maximum length of the crystal was about 1.5 mm. The X-ray diffraction data were refined well by assuming a cubic structure of the space group Pm n, and the lattice constant a was 5.7471 (10) ?. The temperature dependence of the resistivity showed semiconductor-like characteristics with a very small activation energy Ea of 0.45 meV at low temperatures, and the resistivity at 300 K was 0.1 cm. The temperature dependence of the molar magnetic susceptibility showed the Curie-Weiss paramagnetic behavior with a small molar Curie constant Cmol of 5.0(1) × 10-3 emu K/(mol Oe), indicating the existence of localized spin moments.

关键词： Single Crystal Electrochemical Technique CaPd3O4

Antarctic Radiosonde Observations Reduce Uncertainties and Errors in Reanalyses and Forecasts over the Southern Ocean:An Extreme Cyclone Case

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2020年第5期37卷 431-440页

作者： Kazutoshi sato Jun INOUE akira YAMAZAKI Naohiko HIRASAWA Konosuke SUGIURA Kyohei YAMADA Kitami Institute of Technology Kitami 090-8507Japan Application Laboratory Japan Agency for Marine-Earth Science and TechnologyYokohama 236-0001Japan National Institute of Polar Research Tachikawa 190-8518Japan SOKENDAI(Graduate University for Advanced Studies) Hayama 240-0193Japan University of Toyama Toyama 930-8555Japan

Cyclones with strong winds can make the Southern Ocean and the Antarctic a dangerous *** weather forecasts are essential for safe shipping in the Southern Ocean and observational and logistical operations at Antarctic research *** study investigated the impact of additional radiosonde observations from Research Vessel"Shirase"over the Southern Ocean and Dome Fuji Station in Antarctica on reanalysis data and forecast experiments using an ensemble data assimilation system comprising the Atmospheric General Circulation Model for the Earth Simulator and the Local Ensemble Transform Kalman Filter Experimental Ensemble Reanalysis,version 2.A 63-member ensemble forecast experiment was conducted focusing on an unusually strong Antarctic cyclonic *** data with(observing system experiment)and without(control)additional radiosonde data were used as initial *** observing system experiment correctly captured the central pressure of the cyclone,which led to the reliable prediction of the strong winds and moisture transport near the ***,the control experiment predicted lower wind speeds because it failed to forecast the central pressure of the cyclone *** were found in cyclone predictions of operational forecast systems with and without assimilation of radiosonde observations from Dome Fuji Station.

关键词： radiosonde data assimilation TIGGE Antarctica weather forecast

Helicobacter pylori-infected animal models are extremely suitable for the investigation of gastric carcinogenesis

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第45期11卷 7063-7071页

作者： Masaaki Kodama Kazunari Murakami Ryugo sato Tadayoshi Okimoto akira Nishizono Toshio Fujioka Department of Gastroenterology Department of Infectious Diseases (Microbiology)

Although various animal models have been developed to clarify gastric carcinogenesis, apparent mechanism of gastric cancer was not clarified in recent years. Since the recognition of the pathogenicity of Helocobacter pylori（H pylori）, several animal models with H pylori infection have been developed to confirm the association between Hpylori and gastric cancer. Nonhuman primate and rodent models were suitable for this study. Japanese monkey model revealed atrophic gastritis and p53 mutation after long-term infection of Hpylori. Mongolian gerbil model showed the development of gastric carcinoma with H pylori infection alone, as well as with combination of chemical carcinogens, such as N-methyl- N-nitrosourea and N-methyl-N-nitro-N＇-nitrosoguanidine. The histopathological changes of these animal models after H pylori inoculation are closely similar to those in human beings with Hpylori infection. Eradication therapy attenuated the development of gastric cancer in Hpylori- infected Mongolian gerbil. Although several features of animal models differ from those seen in human beings, these experimental models provide a starting point for further studies to clarify the mechanism of gastric carcinogenesis as a result of Hpylon infection and assist the planning of eradication therapy to prevent gastric carcinoma.

关键词： Helicobacter pylori Gastric carcinoma Animal model Japanese monkey Mongolian gerbil