检索结果-南通市图书馆

NUMERICAL PREDICTION OF DYNAMIC PERFORMANCE OF PELTON TURBINE

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2007年第3期19卷 356-364页

作者： KUBOTA takashi College of Electric Power South China University of Technology Guangzhou 510640 China

Different from the reaction turbines, the hydraulic performance of Pelton turbine is dynamic due to the unsteady flow in the rotating buckets in time and space. The dynamic energy efficiency of bucket ηεB and power efficiency of bucket ηPB within a short period can be predicted from the dynamic flow pattern of the free-surface sheet flow in the rotating bucket, whereas the dynamic discharge efficiency of bucket ηQB is defined as the resident discharge in the bucket at the respective moment. Under the operation of higher unit speed non than the optimum one, the power efficiency of bucket is deteriorated by the jet interference with the rear surface of bucket △Prear at the first stage of the dynamic performance, as well as the loss power due to the spilt flow from the cutout of bucket at the later stage of performance. Based on the dynamic performance prediction presented, the future possibility of the quantitative investigation for the negative scale effect of Pelton turbines was discussed.

关键词： dynamic energy efficiency dynamic discharge efficiency dynamic power efficiency rotating bucket Pelton turbine

Assessment of cardiac output in liver transplantation recipients

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2008年第4期7卷 362-366页

作者： Tomohide Hori Chiduru Yamamoto Shintaro Yagi Taku Iida Kentaro Taniguchi takashi Hasegawa Koichiro Yamakado Yukinobu Hori Kan Takeda Kazuo maruyama Shinji Uemoto Department of Hepato-Pancreato-Biliary Surgery and Transplantation Kyoto University Hospital54 Shogoinkawara- choSakyo-kuKyoto606-8507Japan Department of Hepatobiliary Pancreatic Surgery Mie University Hospital2-174 EdobashiTsu CityMie Prefecture514-8507 Japan Department of Anesthesiology and Critical Care Medicine Mie University Graduate School of Medicine2-174 EdobashiTsu CityMie Prefecture514-8507Japan Department of Radiology Mie University Graduate School of Medicine2-174 EdobashiTsu CityMie Prefecture514-8507Japan Nagoya Economic University Graduate School of Law 61-1 UchikuboInuyama City Aichi Prefecture 484-8504Japan

BACKGROUND:Liver cirrhosis causes peculiar systemic hemodynamics,and accurate evaluation of systemic hemodynamic state is important for cirrhotic recipients who underwent living donor liver transplantation(LDLT). We investigated the clinical advantages of a novel non- invasive method for measuring systemic hemodynamic parameters using indocyanine green(ICG). METHODS:Twenty-eight LDLT recipients were evaluated. Simultaneous measurements of cardiac output(CO)using Swan-Ganz catheters and pulse dye densitometry(PDD) were performed every 12 hours after LDLT.A total of 155 sets of simultaneous CO measurements were obtained. RESULTS:The CO values obtained by PDD correlated well with those obtained by the invasive catheter *** addition,none of the recipients developed any side-effects, and we verified the safety of repeated ICG *** is safe,even for repeated use over time in the same recipient. Moreover,PDD can measure the blood volume(BV).CONCLUSIONS:Since the cirrhotic systemic hemody- namics characterized by high CO and large BV remains, even after LDLT,the ability to measure CO and BV in a non-invasive,simple and real-time manner using PDD has advantages for cirrhotic LDLT recipients.

关键词： liver transplantation indocyanine green pulse dye densitometry blood volume cardiac output liver cirrhosis

Can early precut reduce post-endoscopic retrograde cholangiopancreatography pancreatitis in patients with difficult bile duct cannulation?

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Endoscopy 2024年第9期16卷 519-525页

作者： Tomohiro Tanikawa Keisuke Miyake Mayuko Kawada Katsunori Ishii takashi Fushimi Noriyo Urata Nozomu Wada Ken Nishino Mitsuhiko Suehiro Miwa Kawanaka Hidenori Shiraha Ken Haruma Hirofumi Kawamoto Department of General Internal Medicine 2 Kawasaki Medical SchoolOkayama 7008505Japan

BACKGROUND Endoscopic retrograde cholangiopancreatography(ERCP)is associated with a variety of adverse events(AEs).One of the most important AEs is post-ERCP pancreatitis(PEP),which is most common in cases of difficult biliary *** the precut technique has been reported as a PEP risk factor,recent studies indicate that early precut could reduce PEP,and that precut itself is not a risk *** To evaluate the safety of the precut technique,especially in terms of *** We conducted a retrospective study,spanning the period from November 2011 through December *** included 1556 patients,aged≥20 years,who underwent their initial ERCP attempt for biliary disease with a naïve papilla at the Kawasaki University General Medical *** compared the PEP risk between the early precut and the delayed precut *** The PEP incidence rate did not significantly differ between the precut and nonprecut ***,the PEP incidence was significantly lower in the early precut group than the delayed precut group(3.5%vs 10.5%;P=0.02).The PEP incidence in the delayed precut group without pancreatic stent insertion(17.3%)was significantly higher compared to other cases(P<0.01).CONCLUSION Our findings indicate that early precut may reduce PEP *** the precut decision is delayed,a pancreatic stent should be inserted to prevent PEP.

关键词： Endoscopic retrograde cholangiopancreatography Post-endoscopic retrograde cholangiopancreatography pancreatitis Precut Needle-knife precut papillotomy

Impact of Perioperative Management for Intracranial Arterial Stenosis on Postoperative Stroke Incidence in Coronary Artery Bypass Surgery: A Propensity Matching and Multivariate Analyses

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Surgical Science 2018年第9期9卷 311-324页

作者： Hajime Imura Yuji maruyama Makoto Shirakawa takashi Nitta Department of Cardiovascular Surgery Nippon Medical School Musashikosugi Hospital Kawasaki Japan Nippon Medical School Hospital Tokyo Japan

Background: Intracranial arterial steno-occlusive lesion (IAS) is the most common cause of stroke. We hypothesized that adequate perioperative management for IAS is useful to prevent stroke in coronary artery bypass grafting (CABG). Methods: IAS was evaluated using magnetic resonance imaging/angiography (MRI/A, n = 216) in patients without a history of stroke or carotid stenosis (≥50%) in CABG between May 2005 and June 2018 (n = 424). Off-pump CABG was performed in most patients. Different perioperative managements of systolic arterial pressure (SAP) were applied for patients with and without MRI/A. SAP was strictly maintained at ≥80 mmHg in patients with significant IAS (≥50%, n = 28) and ≥90 mmHg for severe IAS (≥70%, n = 44) while SAP less than 80 mmHg (usually ≥70 mmHg) was allowed for patients without MRI/A. Intra-aortic balloon pumping was used for patients with multiple severe IAS and/or occlusion. Clinical outcomes were compared between patients with and without MRI/A. Propensity matching was performed (n = 181 each). Results: Complete revascularization was achieved in all patients. Nine patients (2.12%) had postoperative strokes;the incidence of stroke was signifi-cantly less in patients with preoperative MRI/A (n = 1, p = 0.016). There was no significant difference in the incidence of in-hospital mortality between patients with and without preoperative MRI/A (0.5% and 1.0%, respectively;p = 0.529). Multivariate analysis revealed that no preoperative MRI/A was the only significant predictors of postoperative stroke (p = 0.045). The incidence of stroke was not higher in patients with IAS who underwent MRI/A (p = 0.332). Conclusions: Preoperative evaluation of IAS using MRI/A and following our perioperative management significantly reduced perioperative stroke in patients undergoing CABG.

关键词： CABG Intracranial Arterial Stenosis Stroke Magnetic Resonance Imaging Off-Pump

Analysis of shopping behavior characteristics in the Keihanshin metropolitan area in Japan based on a person trip survey

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2020年第4期23卷 305-315页

作者： takashi Yamada Takumi Hayashida Department of Human Factors Engineering and Environmental Design Faculty of Biology-Oriented Science and TechnologyKindai UniversityKinokawaWakayamaJapan

This study analyzed weekday shopping behavior from a home base to a destination using data from the 4th Keihanshin metropolitan area person trip *** first analyzed the relationships between occupation and transportation means,transportation means and travel time,and transportation means and duration of time at the *** of a chi-square test,residual analysis,and correspondence analysis confirmed that employed persons tend to travel by cars while unemployed persons tend to travel by bus or *** relationship between travel time and duration of time at the destination was also revealed according to transportation *** of a cluster analysis then classified shopping behaviors to expose four ***,multiple regression analyzed the degree to which certain variables were related to duration of time at the *** confirmed a strong relationship between duration of time at the destination and travel *** degree of this factor’s influence on other variables was also *** value of these findings is that the relationship between travel time by means of transportation and the duration of time at the destination was clarified using statistical *** then found a highly accurate equation that estimates the duration of time at a destination from the travel *** the duration of time at a destination can be estimated,it may be possible to more accurately develop the structure of rest facilities,the number of parking lots,the degree of congestion,and so on,which can be associated with the customer’s usage behavior in a shopping *** research in this paper contributes to the field of urban analysis and marketing by presenting a new effective method for person trip survey and analysis.

关键词： Person trip survey shopping behavior transportation means travel time duration of time at a destination

A GAN-based temporally stable shading model for fast animation of photorealistic hair

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computational Visual Media 2021年第1期7卷 127-138页

作者： Zhi Qiao takashi Kanai Department of General Systems Studies Graduate School of Arts and SciencesThe University of TokyoTokyoJapan

We introduce an unsupervised GANbased model for shading photorealistic hair *** model is much faster than previous rendering algorithms and produces fewer artifacts than other neural image translation *** main idea is to extend the Cycle-GAN structure to avoid semitransparent hair appearance and to exactly reproduce the interaction of the lights with the *** use two constraints to ensure temporal coherence and highlight *** approach outperforms and is computationally more efficient than previous methods.

关键词： hair animation fast shading neural networks

Artificial oxygen carriers,from nanometer-to micrometer-sized particles,made of hemoglobin composites substituting for red blood cells

在线全文

学校读者我要写书评

暂无评论

Particuology 2022年第5期20卷 43-55页

作者： takashi Matsuhira Hiromi Sakai Department of Chemistry Nara Medical University840 Shijo-choKashihara 634-8521Japan

Blood transfusions are regarded as the most well-known and frequently performed cell *** current transfusion systems are sophisticated,they cannot be freed from the inherent difficulties that include infection,short shelf life,and blood type *** oxygen carriers produced using hemoglobin(Hb)are designated as Hb-based oxygen carriers(HBOCs),which are anticipated for use as biomaterials that have potential to resolve issues of transfusion by a radical paradigm *** HBOCs,nanometer-sized to micrometer-sized bioparticles having an oxygen-carrying function,are developed for use as substitutes for red blood cells(RBCs).This paper presents an overview of the classification of HBOCs with reference to their histories,preparations,structures,functions,and in vitro and in vivo ***,we give a more detailed introduction of our academic studies of liposome encapsulated Hb,designated as Hb-vesicles(HbV),which mimic the physiologically important corpuscular structure of *** review outlines perennial efforts and approaches to mimic RBC functions through chemical,genetic,and encapsulation *** will provide important insights into the eventual realization of an alternative for RBC transfusion.

关键词： Blood substitutes Cross-linking Hemoglobin(Hb)-based oxygen carriers(HBOCs) Liposome Supramolecular assembly Transfusion alternatives

Unsteady separation of jet branch by cutout of rotating Pelton bucket

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2011年第2期54卷 302-310页

作者： KUBOTA takashi College of Electric Power South China University of Technology

As a part of boundaries for a free curved surface of a Pelton bucket,the cutout is indispensable to secure the smooth entrance of the unsteady inflow of water jet into the rotating *** cutout of the rotating bucket unsteadily separates a free jet into two branches in both space and time:the impinging branch landing on the relevant bucket surface,and the flow-off branch separated by the cutout toward the preceding *** order to investigate the unsteady jet separation by the cutout three-dimensionally,a semicircular free jet was discretized into 641 nodes of boundary-fitted *** position P of impinging jet branch landing on the bucket surface was acquired with the relative velocity W and the water depth D at each *** trailing edge surface of the flow-off jet branch was simultaneously computed *** complicate unsteady interaction of the bucket cutout with the branched free jets was clarified visually with the 3D view of illustrations in order to research the unsteady hydraulic performance of Pelton turbines in space and time.

关键词： cutout rotating bucket jet branch trailing edge surface of jet unsteady in space and time

NON-UNIQUENESS OF THE RECONSTRUCTION FOR CONNECTED AND SIMPLY CONNECTED SETS IN THE PLANE BY THEIR FIXED FINITE PROJECTIONS

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2012年第4期32卷 1637-1646页

作者： takashi Takiguchi Department of Mathematics National Defense Academy of JapanYokosuka Kanagawa 239-8686 Japan

We discuss a problem to reconstruct the measurable sets in the plane from their fixed finite projections. In the main theorem, we construct an example of connected and simply connected polygons which are not uniquely reconstructed by their fixed finite projections. We also make a comparison between our main theorem and the known results on this problem.

关键词： Radon transform inverse problem