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Heat Transfer Characteristics of Work Fluid Including Phase Change Material That Flow into Heating Surface from Narrow Path

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Open Journal of Fluid Dynamics 2014年第5期4卷 454-462页

作者： Shin-Ichi Morita Yasutaka Hayamizu takanobu yamada Akihiko Horibe Naoto Haruki Toshiaki Setoguchi Kazuma Adachi Department of Mechanical Engineering National Institute of Technology Yonago College Yonago Japan Department of Mechanical Engineering Kitami Institute of Technology Kitami Japan Graduate School of Natural Science and Technology Okayama University Okayama Japan Department of Advanced Technology Fusion Saga University Saga Japan Graduate School of Machine Creative Engineering Nagaoka University of Technology Nagaoka Japan

Use of the low temperature (less than 100°C) energy contributes to effective use of heat resources. The cost recovery by power generation is difficult by using an existing system (the binary cycle or the thermoelectric conversion element), because the initial investment is large. The final purpose of this research is development of the low temperature difference drive engine supposing use in a hot-springs resort as a power source for electric power generation. In order that a traveler may look at and delight a motion of an engine, it is made to drive at low-speed number of rotations. An engine cycle of this study is aimed at the development of Stirling cycle engine which can maintain high efficiency in small size. This kind of engine has simple structure;it brings low cost, and it is easy to perform maintenance. However, it is difficult to obtain enough output by this type of engine, because of its low temperature difference. This paper deals with the heat transfer characteristic that the working fluid including a phase change material flows into the heating surface from the narrow path. In order to increase the amount of the heat transmission, Diethylether is added to the working fluid. Diethylether is selected as a phase change material (PCM) that has the boiling point which exists between the heat source of high temperature and low temperature. The parameters of the experiment are additive amount of PCM, rotational speed of the displacer piston and temperature of heat transfer surface. It is shown that it is possible to make exchange of heat amount increase by adding phase change material. The result of this research shows the optimal condition of the difference in temperature in heat processing, number of revolutions, and addition concentration of PCM.

关键词： Phase Change Material Heat Transfer Low Temperature Difference Working Fluid

Feasibility of gastric endoscopic submucosal dissection in elderly patients aged≥80 years

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World Journal of Gastrointestinal Endoscopy 2022年第1期14卷 49-62页

作者： Yasuhiro Inokuchi Ayaka Ishida Kei Hayashi Yoshihiro Kaneta Hayato Watanabe Kazuki Kano Mitsuhiro Furuta Kosuke Takahashi Hirohito Fujikawa takanobu yamada Kouji Yamamoto Nozomu Machida Takashi Ogata Takashi Oshima Shin Maeda Department of Gastroenterology Kanagawa Cancer CenterYokohama 241-8515KanagawaJapan Department of Gastrointestinal Surgery Kanagawa Cancer CenterYokohama 241-8515KanagawaJapan Department of Biostatics Yokohama City University School of Medicine.Yokohama 236-0004KanagawaJapan Department of Gastroenterology Yokohama City UniversityYokohama 236-0004KanagawaJapan

BACKGROUND Endoscopic resection,especially endoscopic submucosal dissection(ESD),is increasingly performed in elderly patients with early gastric cancer,and lesions beyond the expanded indications are also resected endoscopically in some *** is essential to assess whether gastric ESD is safe and suitable for elderly patients and investigate what type of lesions carry an increased risk of ESD-related *** To assess the efficacy and feasibility of gastric ESD for elderly patients,and define high-risk lesions and prognostic *** Among a total of 1169 sessions of gastric ESD performed in Kanagawa Cancer Center Hospital from 2006 to 2014,179 sessions(15.3%)were performed in patients aged≥80 years,and 172 of these sessions were done in patients with a final diagnosis of gastric *** patients were studied retrospectively to evaluate short-term outcomes and *** short-term outcomes included the rates of en bloc resection and curative resection,complications,and procedurerelated *** was assessed according to the Japanese Gastric Cancer Treatment Guidelines ***’s exact test was used to statistically analyze risk *** characteristics of each group were compared using Fisher’s exact test and Mann-Whitney U *** rates at each time point were based on Kaplan-Meier *** survival rates were compared between patients with gastric cancer in each group with use of the log-rank *** identify prognostic factors that jointly predict the hazard of death while controlling for model overfitting,we used the least absolute shrinkage and selection operator(LASSO)Cox regression model including factors curative/noncurative,age,gender,body mass index,prognostic nutritional index,Charlson comorbidity index(CCI),Glasgow prognostic score,neutrophil-to-lymphocyte ratio,and antithrombotic agent *** selected the LASSO Cox regression model that resulted in minimal prediction error in 10-f

关键词： Endoscopic submucosal dissection Elderly Charlson comorbidity index Early gastric cancer Complications Prognostic indicators

Prognostic factors in stage IB gastric cancer

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World Journal of Gastroenterology 2014年第21期20卷 6580-6585页

作者： Toru Aoyama Takaki Yoshikawa Hirohito Fujikawa Tsutomu Hayashi Takashi Ogata Haruhiko Cho takanobu yamada Shinichi Hasegawa Kazuhito Tsuchida Norio Yukawa Takashi Oshima Mari S Oba Satoshi Morita Yasushi Rino Munetaka Masuda Department of Gastrointestinal Surgery Kanagawa Cancer CenterYokohama 241-0815Japan Department of Surgery Yokohama City UniversityYokohama 236-0004Japan Department of Biostatistics and Epidemiology Yokohama City UniversityYokohama 236-0004Japan

AIM:To identify the subset of patients with stage IB gastric cancer with an unfavorable ***:Overall survival(OS)rates were examined in 103 patients with stage IB(T1N1M0 and T2N0M0)gastric cancer between January 2000 and *** and multivariate analyses were performed to identify risk factors using a Cox proportional hazards ***:The OS rates of patients with T1N1 and T2N0 cancer were 89.2%and 94.1%at 5-years,*** univariate and multivariate analyses demonstrated that tumor location was the only significant prognostic *** OS rate was 81.8%at5-years when the tumor was located in the upper third of the stomach and was 95.5%at 5-years when the tumor was located in the middle or lower third of the stomach(P=0.0093).CONCLUSION:These data may suggest that tumor location is associated with survival in patients with stage IB gastric cancer.

关键词： Gastric cancer Stage IB Prognostic factor

Acute hepatitis B of genotype H resulting in persistent infection

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World Journal of Gastroenterology 2014年第11期20卷 3044-3049页

作者： Norie yamada Ryuta Shigefuku Ryuichi Sugiyama Minoru Kobayashi Hiroki Ikeda Hideaki Takahashi Chiaki Okuse Michihiro Suzuki Fumio Itoh Hiroshi Yotsuyanagi Kiyomi Yasuda Kyoji Moriya Kazuhiko Koike Takaji Wakita takanobu Kato Department of Virology Ⅱ National Institute of Infectious DiseasesShinjyuku-KuTokyo 162-8640Japan Department of Internal Medicine Center for Liver DiseasesKiyokawa HospitalSuginamiTokyo 166-0004Japan Division of Gastroenterology and Hepatology Department of Internal MedicineSt. Marianna University School of MedicineKanagawa 216-8511Japan Department of Infectious Diseases Graduate School of MedicineThe University of TokyoTokyo 113-8655Japan Department of Infection Control and Prevention Graduate School of MedicineThe University of TokyoTokyo 113-8655Japan Department of Gastroenterology Graduate School of MedicineThe University of TokyoTokyo 113-8655Japan

A 47-year-old man presented with general fatigue and dark *** laboratory data showed increased levels of hepatic *** patient was positive for hepatitis B virus(HBV)markers and negative for antihuman immunodeficiency *** HBV-DNA titer was set to 7.7 log copies/*** patient was diagnosed with acute hepatitis *** HBV infection route was *** serum levels of hepatic transaminases decreased to normal ranges without any treatment,but the HBVDNA status was maintained for at least 26 mo,indicating the presence of persistent *** isolated HBV from the acute-phase serum and determined the genome sequence.A phylogenetic analysis revealed that the isolated HBV was genotype *** this patient,the elevated peak level of HBV-DNA and the risk alleles at human genome single nucleotide polymorphisms s3077and rs9277535 in the human leukocyte antigen-DP locus were considered to be risk factors for chronic *** case suggests that there is a risk of persistent infection by HBV genotype H following acute hepatitis;further cases of HBV genotype H infection must be identified and ***,the complete determination of the HBV genotype may be essential during routine clinical care of acute hepatitis B outpatients.

关键词： Acute hepatitis Chronic hepatitis Genotyping Hepatitis B virus Single nucleotide polymorphisms