检索结果-南通市图书馆

Experimental study of the woody debris trapping efficiency of a steel pipe,open sabo dam

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2020年第5期35卷 431-443页

作者： Ryuhei Tateishi toshiyuki Horiguchi Yoshimi Sonoda Nobutaka Ishikawa Department of Civil and Structural Engineering Kyusyu University Department of Civil Engineering National Defense Academy National Defense Academy

In recent years,the damage caused to human settlements in Japan by large woody debris(LWD) has been *** example,the 2013 Izu Oshima typhoon resulted in a large number of fatalities and missing persons,and the Kagoshima Typhoon Disaster and Northern Kyusyu torrential downpour caused vast infrastructure damage due to the associated *** countermeasures for preventing LWD are insufficient to maintain the safety of residential *** type of protective barrier,the open sabo dam,has been constructed in Japan during the past 30 *** primary function of open sabo dams is to block the flow of boulders,thereby also reducing sediment flow by reducing the gap ***,because Japanese open sabo dams are designed specifically for boulder-trapping,the ability of these dams to trap LWD remains *** particular,many problems have been reported with respect to sediment trapping by driftwood with roots in an open sabo dam *** objective of this study was to examine the trapping efficiency of open sabo dams for LWD and *** experimental approach clarified the influence of driftwood,without and with roots,on sediment trapping for a straight-channel *** flexible roots of the driftwood were shown to have a significant effect on the sediment trapping efficiency of the dam.

关键词： Driftwood Open sabo dam Trapping efficiency Woody debris

Gamete Dialogs in Green Lineages

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2015年第10期8卷 1442-1454页

作者： toshiyuki Mori Hiroko Kawai-Toyooka Tomoko Igawa Hisayoshi Nozaki Department of Biological Sciences Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan Graduate School of Horticulture Chiba University 648 Matsudo Matsudo Chiba 271-8510 Japan

Gamete fusion is a core process of sexual reproduction and, in both plants and animals, different sex gametes fuse within species. Although most of the molecular factors involved in gamete interaction are still unknown in various sex-possessing eukaryotes, reports of such factors in algae and land plants have been increasing in the past decade. In particular, knowledge of gamete interaction in flowering plants and green algae has increased since the identification of the conserved gamete fusion factor GENERATIVE CELL SPECIFIC 1/HAPLESS 2 （GCS1/HAP2）. GCSl was first identified as a pollen generative cell-specific transmembrane protein in the lily （Lilium Iongiflorum）, and was then shown to function not only in flowering plant gamete fusion but also in various eukaryotes, including unicellular protists and metazoans. In addition, although initially restricted to Chlamydomonas, knowledge of gamete attachment in flowering plants was also acquired. This review focuses on recent progress in the study of gamete interaction in volvocine green algae and flowering plants and discusses conserved mechanisms of gamete recognition, attachment, and fusion leading to zygote formation.

关键词： sexual reproduction gamete fusion flowering plants green algae evolution

Study on analysis of crystal structure in CeO_2 doped with Er_2O_3 or Gd_2O_3

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2010年第S1期28卷 164-167页

作者： Yuki Tahara Kazufumi Yasunaga toshiyuki Matsui Fuminobu Hori Akihiro Iwase Department of Materials Science Osaka Prefecture University1-1Gakuen-choNaka-kuSakaiOsaka599-8531Japan Department of Applied Quantum Physics and Nuclear Engineering Kyushu University744MotookaNishikuFukuoka 819-0395Japan

To simulate the effects of burnable poison doping in nuclear fuel UO2,Er2O3(or Gd2O3)-doped CeO2 pellets were prepared. Changes in lattice constant and atomic disordering for CeO2 due to the Er2O3 and Gd2O3 doping were measured by means of XRD and XAFS. By the Er2O3 doping,the lattice constant decreased,and a disordering of lattice structure was induced in the samples. The doping with Er2O3 also induced the disordering of atomic arrangement around Er atoms,which was observed through the change in XAFS spectra. In contrast,the effect of Gd2O3 doping was smaller than that of Er2O3 doping. The result was discussed in terms of ionic size of dopants in CeO2 crystal.

关键词： CeO2 ceramic pellets Er2O3 and Gd2O3 doping Change in lattice structure XRD XAFS rare earths

On the Mitigation of Polarization Dependency of Distributed Raman Amplifier Gain by Transmission Fiber PMD

在线全文

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 635-636页

作者： toshiyuki TOKURA Takashi MIZUOCHI Information Technology R & D Center Mitsubishi Electric Corporation 5-1-1 Ofuna Kamakura Kanagawa 247-8501 JapanInformation Technology R & D Center Mitsubishi Electric Corporation 5-1-1 Ofuna Kamakura Kanagawa 247-8501 Japan

We show theoretically and experimentally that Raman PDG can be formulated as a function of the pump light DOP and the transmission fiber PMD. Raman PDG is sufficiently reduced thanks to the inevitable fiber PMD.

关键词： of it in be PDG On the Mitigation of Polarization Dependency of Distributed Raman Amplifier Gain by Transmission Fiber PMD by

Utility of single-incision totally extraperitoneal inguinal hernia repair with intraperitoneal inspection

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2017年第12期9卷 264-269页

作者： Masateru Yamamoto Takashi Urushihara toshiyuki Itamoto Department of Gastroenterological Breast and Transplant SurgeryHiroshima Prefectural Hospital Department of Gastroenterological and Transplant Surgery Applied Life ScienceInstitute of Biomedical and Health ScienceHiroshima University

AIM To study the utility of single-incision totally extraperitoneal inguinal hernia repair with intraperitoneal *** A 2 cm transverse skin incision was made in the umbilicus, extending to the intraperitoneal cavity. Carbon dioxide was insufflated followed by insertion of laparoscope to observe the intraperitoneal cavity. The type of hernia was diagnosed and whether there was the presence of intestinal incarceration was confirmed. When an intestinal incarceration in the hernia sac was found, the forceps were inserted through the incision site and the intestine was returned to the intraperitoneal cavity without increasing the number of trocars. Once the peritoneum was closed, totally extraperitoneal inguinal hernia repair was performed, and finally, intraperitoneal observation was performed to reconfirm the *** Of the 75 hernias treated, 58 were on one side, 17 were on both sides, and 10 were recurrences. The respective median operation times for these 3 groups of patients were 100 min(range, 66 to 168), 136 min(range, 114 to 165), and 125 min(range, 108 to 156), with median bleeding amounts of 5 g(range, 1 to 26), 3 g(range, 1 to 52), and 5 g(range, 1 to 26), respectively. Intraperitoneal observation showed hernia on the opposite side in 2 cases, intestinal incarceration in 3 cases, omental adhesion into the hernia sac in 2 cases, severe postoperative intraperitoneal adhesions in 2 cases, and bladder protrusion in 1 case. There was only 1 case of *** Single-incision totally extraperitoneal inguinal hernia repair with intraperitoneal inspection makes hernia repairs safer and reducing postoperative complications. The technique also has excellent cosmetic outcomes.

关键词： Inguinal hernia Intestinal incarceration Totally extraperitoneal inguinal hernia repair Intraperitoneal inspection Single incision

Phase-Plane Invariant Analysis of Pressure Fluctuations in Fluidized Beds

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2007年第3期12卷 284-289页

作者：王晓亮何榕 toshiyuki Suda Junichi Sato Department of Thermal Engineering Tsinghua University Technical Development Department Ishikawajima-Harima Heavy Industries Co.Ltd. Yokohama 235-8501Japan

Partial agglomeration is a major problem in fluidized beds. A chaotic analytical method based on the phase-plane invariant of the pressure fluctuations in the fluidized beds has been used to warn of agglomeration at an early stage. Cold tests （no combustion） and hot tests （combustion） in fluidized beds show that the phase-plane invariant of the pressure fluctuations can distinguish the dynamic behavior of fluidized beds with different flow rates in cold tests. With combustion, when the flow rate was kept constant, agglomeration was detected very early by looking at the phase-plane invariant. The phase-plane invariant can be used to distinguish changes in fluidized beds due to changes in the flow rate, agglomeration, or various other factors. Therefore, this reliable agglomeration early warning system can be used for better control of circulating fluidized beds.

关键词： pressure fluctuation chaos phase-plane invariant fluidized beds

High Precision Ultrasonic Guided Wave Technique for Inspection of Power Transmission Line

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2017年第1期30卷 170-179页

作者： CHENG Jun QIU Jinhao JI Hongli WANG Enrong TAKAGI toshiyuki UCHIMOTO Tetsuya School of Physics and Technology Nanjing Normal UniversityNanjing 210042China School of Electrical and Automation Engineering Nanjing Normal UniversityNanjing 210042China State Key Laboratory of Mechanics and Control for Mechanical Structures Nanjing University of Aeronautics and AstronautiesNanjing 210016China Institute of Fluid Science Tohoku UniversitySendai 980-8577Japan

Due to the merits of high inspection speed and long detecting distance, Ultrasonic Guided Wave（UGW） method has been commonly applied to the on-line maintenance of power transmission line. However, the guided wave propagation in this structure is very complicated, leading to the unfavorable defect localization accuracy. Aiming at this situation, a high precision UGW technique for inspection of local surface defect in power transmission line is proposed. The technique is realized by adopting a novel segmental piezoelectric ring transducer and transducer mounting scheme, combining with the comprehensive characterization of wave propagation and circumferential defect positioning with multiple piezoelectric elements. Firstly, the propagation path of guided waves in the multi-wires of transmission line under the proposed technique condition is investigated experimentally. Next, the wave velocities are calculated by dispersion curves and experiment test respectively, and from comparing of the two results, the guided wave mode propagated in transmission line is confirmed to be F（1,1） mode. Finally, the axial and circumferential positioning of local defective wires in transmission line are both achieved, by using multiple piezoelectric elements to surround the stands and send elastic waves into every single wire. The proposed research can play a role of guiding the development of highly effective UGW method and detecting system for multi-wire transmission line.

关键词： ultrasonic guided wave inspection power transmission line piezoelectric transducer defect positioning wavelet transform

Micro air vehicle-motivated computational biomechanics in bio-flights:aerodynamics,flight dynamics and maneuvering stability

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2010年第6期26卷 863-879页

作者： Hao Liu toshiyuki Nakata Na Gao Masateru Maeda Hikaru Aono Wei Shyy Graduate School of Engineering.Chiba University Chiba 263-8522Japan Department of Aerospace Engineering.University of Michigan Ann ArborMI 48109USA Department of Mechanical Engineering The Hong Kong University of Science and TechnologyClear Water Bay.KowloonHong Kong China

Aiming at developing an effective tool to unveil key mechanisms in bio-flight as well as to provide guidelines for bio-inspired micro air vehicles（MAVs） design,we propose a comprehensive computational framework,which integrates aerodynamics,flight dynamics,vehicle stability and *** framework consists of（1） a Navier-Stokes unsteady aerodynamic model;（2） a linear finite element model for structural dynamics;（3） a fluidstructure interaction（FSI） model for coupled flexible wing aerodynamics aeroelasticity;（4） a free-flying rigid body dynamic（RBD） model utilizing the Newtonian-Euler equations of 6DoF motion;and（5） flight simulator accounting for realistic wing-body morphology,flapping-wing and body kinematics,and a coupling model accounting for the nonlinear 6DoF flight dynamics and stability of insect flapping *** are presented based on hovering aerodynamics with rigid and flexible wings of hawkmoth and *** present approach can support systematic analyses of bio- and bio-inspired flight.

关键词： Micro air vehicle Bio-flight Computational mechanics Integrative biomechanics

Development of sequential type iron salt-catalyzed Nazarov/Michael reaction in an ionic liquid solvent system

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2012年第8期55卷 1627-1632页

作者： IBARA Chie FUJIWARA Masamune HAYASE Shuichi KAWATSURA Motoi ITOH toshiyuki Department of Chemistry and Biotechnology Graduate School of Engineering Tottori University 4-101 Koyama-minami Tottori 680-8552 Japan

Sequential type one pot Nazarov/Michael reaction of pyrrole derivatives has been demonstrated using 5 tool% Fe（C104）3· A120 as catalyst in an ionic liquid as solvent. We succeeded in obtaining 4,5-dihydrocyclopenta[b]pyrrol-6（1H）-one derivative in good yield for five repetitions of the reactions without any addition of the catalyst using an ionic liquid, [bmim][NTf2], as sol- vent system.

关键词： Nazarov cyclization Michael reaction green synthesis iron catalyst ionic liquids