检索结果-南通市图书馆

Canards Flying on Bifurcation

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 Pure Mathematics 2023年第6期13卷 412-424页

作者： Shuya Kanagawa kiyoyuki Tchizawa Deparatment of Mathematics Tokyo City University Tokyo Japan Institute of Administration Engineering Ltd. Tokyo Japan

There exists a property “structural stability” for “4-dimensional canards” which is a singular-limit solution in a slow-fast system with a bifurcation parameter. It means that the system includes the possibility to have some critical values on the bifurcation parameter. Corresponding to these values, the pseudo-singular point, which is a singular point in the time-scaled-reduced system should be changed to another one. Then, the canards may fly to another pseudo-singular point, if possible. Can the canards fly? The structural stability gives the possibility for the canards flying. The precise reasons why happen are described in this paper.

关键词： Canard Solution Slow-Fast System Nonstandard Analysis Hilbert’s 16th Problem Brownian Motion Stochastic Differential Equation

Extended Wiener Process in Nonstandard Analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics 2020年第3期11卷 247-254页

作者： Shuya Kanagawa kiyoyuki Tchizawa Department of Mathematics Tokyo City University Setagaya Tokyo Japan Institute of Administration Engineering Ltd. Chiyoda-ku Tokyo Japan

Standing on a different view point from Anderson, we prove that the extended Wiener process defined by Anderson satisfies the definition of the Wiener process in standard analysis, for example the Wiener process at time t obeys the normal distribution N(0,t) by showing the central limit theorem. The essential theory used in the proof is the extended convolution property in nonstandard analysis which is shown by Kanagawa, Nishiyama and Tchizawa (2018). When processing the extension by non-standardization, we have already pointed out that it is needed to proceed the second extension for the convolution, not only to do the first extension for the delta function. In Section 2, we shall introduce again the extended convolution as preliminaries described in our previous paper. In Section 3, we shall provide the extended stochastic process using a hyper number N, and it satisfies the conditions being Wiener process. In Section 4, we shall give a new proof for the non-differentiability in the Wiener process.

关键词： Wiener Process Ito’s Process Stochastic Differential Equation S-Continuity Nonstandard Analysis

Overexpression of c-met in the early stage of pancreatic carcinogenesis; altered expression is not sufficient for progression from chronic pancreatitis to pancreatic cancer

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 2006年第24期12卷 3878-3882页

作者： Kenoki Ohuchida Kazuhiro Mizumoto Nami Ishikawa Yasuhiro Ogura Daisuke Yamada Takuya Egami Hayato Fujita Seiji Ohashi eishi Nagai Masao Tanaka Department of Surgery and Oncology Graduate School of Medical Sciences Kyushu UniversityFukuokaJapan

AIM： To investigate c-met expression during early pancreatic carcinogenesis. METHODS： We used 46 bulk tissues and 36 microdissected samples, including normal pancreas, chronic pancreatitis, and pancreatic cancer, for quantitative realtime reverse transcription-polymerase chain reaction. RESULTS： In bulk tissue analyses, pancreatic cancer tissues expressed significantly higher levels of c-met than did chronic pancreatitis and normal pancreas tissues. c-met levels did not differ between chronic pancreatitis and normal pancreas tissues. In microdissection-based analyses, c-met was expressed at higher levels in microclissected pancreatic cancer cells and pancreatitisaffected epithelial cells than in normal ductal epithelial cells （both, P 〈 0.01）. Interestingly, pancreatitis-affected epithelial cells expressed levels of c-met similar to those of pancreatic cancer cells. CONCLUSION： Overexpression of c-met occurs during the early stage of pancreatic carcinogenesis, and a single alteration of c-met expression is not sufficient for progression of chronic pancreatitis-affected epithelial cells to pancreatic cancer cells.

关键词： c-met', Pancreatic cancer Chronic pancreatitis Pancreatic carcinogenesis

Proof of Ito’s Formula for Ito’s Process in Nonstandard Analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics 2019年第7期10卷 561-567页

作者： Shuya Kanagawa kiyoyuki Tchizawa Department of Mathematics Tokyo City University Setagaya Tokyo Japan Institute of Administration Engineering Ltd. Tokyo Japan

In our previous paper [1], we proposed a non-standardization of the concept of convolution in order to construct an extended Wiener measure using nonstandard analysis by E. Nelson [2]. In this paper, we consider Ito’s integral with respect to the extended Wiener measure and extend Ito’s formula for Ito’s process. Because of doing the extension of Ito’s formula, we could treat stochastic differential equations in the sense of nonstandard analysis. In this framework, we need the nonstandardization of convolution again. It was not yet proved in the last paper, therefore we shall provide the proof.

关键词： Ito’s Process Stochastic Differential Equation S-Continuity Nonstandard Analysis

Quality of life after total vs distal gastrectomy with Rouxen-Y reconstruction: Use of the Postgastrectomy Syndrome Assessment Scale-45

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 2017年第11期23卷 2068-2076页

作者： Masazumi Takahashi Masanori Terashima Hiroshi Kawahira eishi Nagai Yoshikazu Uenosono Shinichi Kinami Yasuhiro Nagata Masashi Yoshida Keishiro Aoyagi Yasuhiro Kodera Koji Nakada Division of Gastroenterological Surgery Yokohama Municipal Citizen’s Hospital Division of Gastric Surgery Shizuoka Cancer Center Center for Frontier Medical Engineering Chiba University Department of Surgery and Science Graduate school of medicine Kyushu University Department of Digestive Surgery Kagoshima University Graduate School of Medicine Department of Surgical Oncology Kanazawa Medical School Center for Comprehensive Community Care Education Graduate School of Biomedical Sciences Nagasaki University Department of Surgery International University of Health and Welfare Hospital Department of Surgery Kurume University School of Medicine Department of Gastroenterological Surgery Nagoya University Graduate School of Medicine Department of Laboratory Medicine The Jikei University School of Medicine

AIM To investigate the detrimental impact of loss of reservoir capacity by comparing total gastrectomy(TGRY) and distal gastrectomy with the same Rouxen-Y(DGRY) reconstruction. The study was conducted using an integrated questionnaire, the Postgastrectomy Syndrome Assessment Scale(PGSAS)-45, recently developed by the Japan Postgastrectomy Syndrome Working *** The PGSAS-45 comprises 8 items from the Short Form-8, 15 from the Gastrointestinal Symptom Rating Scale, and 22 newly selected items. Uni-and multivariate analysis was performed on 868 questionnaires completed by patients who underwent either TGRY(n = 393) or DGRY(n = 475) for stage I gastric cancer(52 institutions). Multivariate analysis weighed of six explanatory variables, including the type of gastrectomy(TGRY/DGRY), interval after surgery, age, gender, surgical approach(laparoscopic/open), and whether the celiac branch of the vagus nerve was preserved/divided on the quality of life(QOL).RESULTS The patients who underwent TGRY experienced the poorer QOL compared to DGRY in the 15 of 19 main outcome measures of PGSAS-45. Moreover, multiple regression analysis indicated that the type of gastrectomy, TGRY, most strongly and broadly impaired the postoperative QOL among six explanatory variables. CONCLUSION The results of the present study suggested that TGRY had a certain detrimental impact on the postoperative QOL, and the loss of reservoir capacity could be a major cause.

关键词： Postgastrectomy syndrome Quality of life Gastric cancer Gastrectomy Patient-reported outcome

Metastatic basaloid-squamous cell carcinoma of the esophagus treated by 5-fluorouracil and cisplatin

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 2007年第26期13卷 3634-3637页

作者： Yoshihiro Shibata eishi Baba Hiroshi Ariyama Ryusuke Miki Nobumichi Ogami Shuji Arita Baoli Qin Hitoshi Kusaba Kenji Mitsugi Hirokazu Noshiro Takashi Yao Shuji Nakano First Department of Internal Medicine and Department of Biosystemic Science of Medicine Graduate School of MedicineKyushu UniversityFukuokaJapan Department of Surgery and Oncology Graduate School of Medical SciencesKyushu UniversityJapan Department of Anatomic Pathology Graduate School of Medical SciencesKyushu UniversityJapan

Basaloid squamous cell carcinoma （BSC） of the esophagus is a rare malignant disease. We report here a patient with recurrent esophageal BSC, who was successfully treated by systemic chemotherapy containing 5-fluorouracil （5-FU） and cisplatin （CDDP）. A 57-year-old woman was diagnosed as having SCluamous cell carcinoma of the esophagus upon endoscopic examination. Curative esophagectomy with lymph node dissection was performed under the thoracoscope. The pathological diagnosis of the surgical specimen was BSC. Five months after operation, the patient was diagnosed as having a recurrence of the BSC with metastases to the liver and spleen, and a right paraclavicular lymph node. She was given systemic chemotherapy consisting of continuous infusion of 800 mg/d of 5-FU and 3 h infusion of 20 mg/d of CDDP for 5 consecutive days every 4 wk. The metastatic lesions in the spleen and right paraclavicular lymph node disappeared, and the liver metastasis was apparently reduced in size after 2 courses of chemotherapy. The tumor regression was seen over 6 courses, with progression afterwards. Although subsequent treatment with CPT-11 and CDDP was not effective, docetaxel and vinorelbine temporarily controlled the tumor growth for 2 mo. 5-FU and CDDP combination may be useful for the patients with advanced BSC.

关键词： Basaloid-squamous cell carcinoma Esophagus Chemotherapy

Extended Wiener Measure by Nonstandard Analysis for Financial Time Series

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics 2018年第8期9卷 975-984页

作者： Shuya Kanagawa Ryoukichi Nishiyama kiyoyuki Tchizawa Epartment of Mathematics Tokyo City University Tokyo Japan Department of literature Ryukoku University Kyoto Japan Institute of Administration Engineering Ltd. Tokyo Japan

We propose a new approach to construct an extended Wiener measure using nonstandard analysis by E. Nelson. For the new definition we construct non-standardized convolution of probability measure for independent random... 详细信息

关键词： Time Series Black-Sholes Model S-Continuity Nonstandard Analysis Delta-Function

ENERGETIC RADIATION INDUCED SELF-ASSEMBLY OF FULLERENE CAGES,ATOM-BRIDGED FULLERENE DIMMERS AND IN SITU SCANNING TUNNELING MICROSCOPIC STUDY

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

ENERGETIC RADIATION INDUCED SELF-ASSEMBLY OF FULLERENE CAGES...

Asia Conference on Nanoscience and Nanotechnology Abstracts Book

作者： SOICHIRO YOSHIMOTO eishi TSUTSUMI KINGO ITAYA Department of Applied Chemistry Graduate School of EngineeringTohoku UniversityAoba-yama 04Sendai 980-8579Japan Department of Applied Chemistry Graduate School of EngineeringTohoku UniversityAoba-yama 04Sendai 980-8579Japan Department of Applied Chemistry Graduate School of EngineeringTohoku UniversityAoba-yama 04Sendai 980-8579Japan

＜正＞ Following a suggestion of Osterodt and Vogtle et al, Dragoe et al. synthesized a functionalized new type of carbon nanomolecule Cm in a thermolysis reaction of C60CBr2 with C60 at a high temperature of 723 K. It is also the first and only one of the C2m-C-C2n, （m=n or m·n） type molecules that have been successfully synthesized so far. In an experiment using electronically neutral beam （neutron） to probe the uniqueness in properties of nanospaces, we found mat energetic-radiation induced self-assembly process of fullerene units was a simple and highly selective method for synthesis of C2m-X-C2n bridged molecules without formation of other byproducts. Tbe method is capable of synthesizing new C2m-X-C2n molecules by introducing X （different atoms） into the reaction system. The results revealed an intriguing new process: Energetic radiation created reactive sites for covalently-bonded bridges between fullerene molecules originally only weakly bound by van der Waals force. This observation may open a new subject and practicable approach for polymer sciences of *** the new method, C70-C-C70, C60-C-C70, C60-C-C60, and C70-O-C70 were prepared and characterized by in situ scanning tunneling microscopy. Their results together with those for direct fullerene dimers C2m=C2n （m=n or m·n）, and pristine cage unite before energetic radiation-induced self-assembly will be presented at the conference.

关键词： Bridged fullerene dimer In situ scanning tunneling microscopy.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

用陶瓷模等温锻造

国外金属加工 1991年第5期12卷 31-37页

作者： kiyoyuki 金戈