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材料科学与工程（中英文B版） 2017年第2期7卷 49-62页

作者： Weixin Fu akitsu Shigetou Shuichi Shoji Jun Mizuno Department of Nanoscience and Nanoengineering Waseda University 3-4-1 Okubo Shinjuku-ku Tokyo 169-8555 Japan National Institute for Material Science OVIMS) 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan Institute for Nanoscience and Nanotechnology Waseda University 513 Tsurumaki-cho Shinjuku-ku Tokyo 162-0041 Japan

Morphology Effects of Leading-edge Serrations on Aerodynamic Force Production： An Integrated Study Using PIV and Force Measurements

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Journal of Bionic Engineering 2018年第4期15卷 661-672页

作者： Teruaki Ikeda tetsuya UedA Toshiyuki Nakata Ryusuke NodA Hiroto Tanaka Takeo Fujii Hao Liu Graduate School of Engineering Chiba University 1-33 Yayoi-cho lnage-ku Chiba-shi Chiba 263-8522 Japan TERAL Inc. 230 Moriwake Miyuki-cho Fukuyama-shi Hiroshima 720-0003 Japan School of Engineering Tokyo Institute of Technology 2-12-10okayama Meguro-ku Tokyo 152-8550 Japan Shanghai Jiao Tong University and Chiba University International Cooperative Research Centre (SJTU-CU ICRC) Shanghai 200240 China

While the leading-edge serration in owls＇ wing is known to be responsible for low noise gliding and flapping flights, the findings on its aero-acoustic role have been diverse or even controversial. Here we present an experimental study of the morphological effects of leading-edge serrations on aerodynamic force production by utilizing owl-inspired, single-feather, clean and serrated wing models with different serration lengths and spacing, and by combining Particle Image Velocimetry （PIV） and force measurements. Force measurements show that an increase in the length and density of the leading-edge serrations leads to a reduction in the lift coefficient and lift-to-drag ratio at Angles of Attack （AoAs）〈 15° whereas the clean and serrated wings achieve comparable aerodynamic performance at higher AoAs 〉 15°, which owl wings often reach in flight. Furthermore PIV visualization of the flow fluctuations demonstrates that the leading-edge serration-based mechanism is consistent in all serrated wing models in terms of passive control of the laminar-turbulent transition while at AoAs 〉 15° similar suction flow is present at leading edge resulting in a comparable aerodynamic performance to that of the clean wing. Our results indicate the robustness and usefulness of leading-edge serration-inspired devices for aero-acoustic control in biomimetic rotor designs.

关键词： biomimetic leading-edge serrations low-speed wind tunnel particle image velocimetry aerodynamic force lami-nar-turbulent transition

Some Hybrid Systems of Chiral Schiff Base Zn(II) Complexes and Photochromic Spiropyrans for Environmental Ion Sensing

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American Journal of Analytical Chemistry 2014年第12期5卷 751-765页

作者： Takatomo Miura Takashi Onodera Shinya Endo Atsuo Yamazaki Takashiro akitsu Department of Chemistry Faculty of Science Tokyo University of Science Tokyo Japan

This is a review article including our recent results and some previous photo functional hybrid system having potential applications for environmental ion sensing. We have prepared several new and known chiral Schiff base Zn(II) complexes and measured (and also calculated) absorption and fluorescence spectra for sole complexes. After assembling hybrid systems with 1,3,3-trime- thylindolino-6’-nitrobenzopyrylospiran (SP) in methanol solutions, we measured spectral changes before and after alternate irradiation of UV and visible light. Intensity of fluorescence spectra for pale yellow Zn(II) complexes (λem = 450 nm, λex = 270 and 360 nm) was quenched by colorless SP (λem = 533 nm, λex = 612 nm). After UV light irradiation to form purple merocyanine (MC), photoisomerization resulted in changes of the intensity of absorption spectra as well as fluorescence spectra. Thus the hybrid systems could successfully act as molecular logic circuit by input (excitation by light) and output (intensity of fluorescence peaks). Moreover, we investigated concentration dependence of doped Zn(II) and Cu(II) ions to confirm quenching of intensity of fluorescence peaks by Zn(II) and Cu(II) MC complexes for metal ion sensing in solutions.

关键词： Zinc(II) Complexes Spiropyran Chirality Fluorescence Ion Sensing

Wind Tunnel Study on Wind and Turbulence Intensity Profiles in Wind Turbine Wake

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Journal of Thermal Science 2011年第2期20卷 127-132页

作者： Takao MAEDA Yasunari KAMADA Junsuke MURATA Sayaka YONEKURA Takafumi ITO Atsushi OKAWA tetsuya KOGAKI Division of Mechanical Engineering Mie University National Institute of Advanced Industrial Science and Technology

In recent years, there has been a rapid development of the wind farms in Japan. It becomes very important to investigate the wind turbine arrangement in wind farm, in order that the wake of one wind turbine does not to interfere with the flow in other wind turbines. In such a case, in order to achieve the highest possible efficiency from the wind, and to install as many as possible wind turbines within a limited area, it becomes a necessity to study the mutual interference of the wake developed by wind turbines. However, there is no report related to the effect of the turbulence intensity of the external flow on the wake behind a wind turbine generated in the wind tunnel. In this paper, the measurement results of the averaged wind profile and turbulence intensity profile in the wake in the wind tunnel are shown when the turbulence intensity of the external wind was changed. The wind tunnel experiment is performed with 500mm-diameter two-bladed horizontal axis wind turbine and the wind velocity in wake is measured by an I-type hot wire probe. As a result, it is clarified that high turbulence intensities enable to the entrainment of the main flow and the wake and to recover quickly the velocity in the wake.

关键词：风力发电机组强度分布湍流强度风力涡轮机隧道风洞实验紊流强度风力发电场

Demonstration of Optical Isolator with CeY_2Fe_5O_(12) Guiding Layer Employing Nonreciprocal Phase Shift

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光学学报 2003年第S1期23卷 169-170页

作者： Kazumasa Sakurai Hideki Yokoi tetsuya Mizumoto Department of Electrical and Electronic Engineering Tokyo Institute of Technology Japan 2-12-1 Ookayama Meguro-ku Tokyo 152-B552 JapanDepartment of Electrical and Electronic Engineering Tokyo Institute of Technology Japan 2-12-1 Ookayama Meguro-ku Tokyo 152-B552 JapanDepartment of Electrical and Electronic Engineering Tokyo Institute of Technology Japan 2-12-1 Ookayama Meguro-ku Tokyo 152-B552 Japan

A waveguide optical isolator with a CeY2Fe5O12 guiding layer employing a nonreciprocal phase shift was studied. The isolation ratio of more than 12.2 dB was achieved at a wavelength of 1.55μm.

关键词： of on as by YIG Guiding Layer Employing Nonreciprocal Phase Shift Demonstration of Optical Isolator with CeY2Fe5O with

Caution to Apply Magnetic Barkhausen Noise Method to Nondestructive Evaluation of Plastic Deformation in Some Ferromagnetic Materials

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Chinese Journal of Mechanical Engineering 2019年第6期32卷 85-91页

作者： Manru He Takanori Matsumoto tetsuya Uchimoto Toshiyuki Takagi Hongen Chen Shejuan Xie Zhenmao Chen Shannxi Engineering Research Center for NDT and Structural Integrity Evaluation State Key Laboratory for Strength and Vibration of Mechanical StructuresSchool of AerospaceXi’an Jiaotong UniversityXi’an 710049China Institute of Fluid Science Tohoku UniversitySendai 980‑8577Japan

Magnetic Barkhausen Noise(MBN) method is known as an effective nondestructive evaluation(NDE) method for evaluation of residual stress in ferromagnetic materials. Some studies on the feasibility of the MBN method for NDE of residual strains were also conducted and found applicable. However, these studies are mainly focused on the state of residual strains which were introduced through a one-cycle-loading process. In practice, however, structures may suffer from an unpredictable and complicated loading history, i.e., the final state of plastic strain may be induced by several times of large loads. Whether the loading history has influences on MBN signals or not is of great importance for the practical application of the MBN method. In this paper, several ferromagnetic specimens with the same final state of residual strain but of different loading history were fabricated and inspected by using a MBN testing system. The experimental results reveal that the loading history has a significant influence on the detected MBN signals especially for a residual strain in range less than 1%, which doubts the feasibility to apply the MBN method simply in the practical environment. In addition, micro-observations on the magnetic domain structures of the plastic damaged specimens were also carried out to clarify the influence mechanism of loading history on the MBN signals.

关键词： Plastic damage Deformation history MBN method Ferromagnetic materials

Randomized controlled trial of pancreatic stenting to prevent pancreatitis after endoscopic retrograde cholangiopancreatography

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World Journal of Gastroenterology 2012年第14期18卷 1635-1641页

作者： Yoshiaki Kawaguchi Masami Ogawa Fumio Omata Hiroyuki Ito Tooru Shimosegawa tetsuya Mine Division of Gastroenterology Tokai University School of MedicineIsehara 259-1193Japan Division of Gastroenterology Tohoku University Graduate School of Medicine1-1 Seiryo-machiAobakuSendai CityMiyagi 980-8574Japan

AIM:To determine the effectiveness of pancreatic duct(PD) stent placement for the prevention of pancreatitis after endoscopic retrograde cholangiopancreatography(ERCP) in high risk ***:Authors conducted a single-blind,randomized controlled trial to evaluate the effectiveness of a pancreatic spontaneous dislodgement stent against post-ERCP pancreatitis,including rates of spontaneous dislodgement and *** defined high risk patients as having any of the following:sphincter of Oddi dysfunction,difficult cannulation,prior history of post-ERCP pancreatitis,pre-cut sphincterotomy,pancreatic ductal biopsy,pancreatic sphincterotomy,intraductal ultrasonography,or a procedure time of more than 30 *** were randomized to a stent group(n = 60) or to a non-stent group(n = 60).An abdominal radiograph was obtained daily to assessspontaneous stent ***-ERCP pancreatitis was diagnosed according to consensus ***:The mean age(± standard deviation) was 67.4 ± 13.8 years and the male:female ratio was 68:*** the stent group,the mean age was 66 ± 13 years and the male:female ratio was 33:27,and in the non-stent group,the mean age was 68 ± 14 years and the male:female ratio was 35:*** were no significant differences between groups with respect to age,gender,final diagnosis,or type of endoscopic *** frequency of post-ERCP pancreatitis in PD stent and non-stent groups was 1.7%(1/60) and 13.3%(8/60),*** severity of pancreatitis was mild in all *** frequency of post-ERCP pancreatitis in the stent group was significantly lower than in the non-stent group(P = 0.032,Fisher's exact test).The rate of hyperamylasemia were 30%(18/60) and 38.3%(23 of 60) in the stent and non-stent groups,respectively(P = 0.05,χ2 test).The placement of a PD stent was successful in all 60 *** rate of spontaneous dislodgement by the third day was 96.7%(58/60),and the median(range) time to dislodgement was 2.1(2-

关键词：随机对照试验胰腺癌胰腺炎胆管内镜预防支架

Quality of ulcer healing in gastrointestinal tract:Its pathophysiology and clinical relevance

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World Journal of Gastroenterology 2012年第35期18卷 4811-4822页

作者： Tetsuo Arakawa Toshio Watanabe tetsuya Tanigawa Kazunari Tominaga Yasuhiro Fujiwara Kenichi Morimoto Department of Gastroenterology Osaka City University Graduate School of Medicine

In this paper,we review the concept of quality of ulcer healing(QOUH) in the gastrointestinal tract and its role in the ulcer *** the past,peptic ulcer disease(PUD) has been a chronic disease with a cycle of repeated healing/remission and *** main etiological factor of PUD is Helicobacter pylori(***),which is also the cause of ulcer ***,***-negative ulcers are present in 12%-20% of patients;they also recur and are on occasion *** focuses on the fact that mucosal and submucosal structures within ulcer scars are incompletely *** the scars of healed ulcers,regenerated tissue is immature and with distorted architecture,suggesting poor *** abnormalities in mucosal regeneration can be the basis for ulcer *** studies have shown that persistence of macrophages in the regenerated area plays a key role in ulcer *** studies in a rat model of ulcer recurrence have indicated that proinflammatory cytokines trigger activation of macrophages,which in turn produce increased amounts of cytokines and chemokines,which attract neutrophils to the regenerated *** release proteolytic enzymes that destroy the tissue,resulting in ulcer *** important factor in poor QOUH can be deficiency of endogenous prostaglandins and a deficiency and/or an imbalance of endogenous growth *** active mucosal protective and antiulcer drugs promote high QOUH and reduce inflammatory cell infiltration in the ulcer *** addition to PUD,the concept of QOUH is likely applicable to inflammatory bowel diseases including Crohn's disease and ulcerative colitis.

关键词：溃疡病胃肠道愈合临床意义病理生理质量幽门螺旋杆菌嗜中性粒细胞

Osmotic pressure of serum and cerebrospinal fluid in patients with suspected neurological conditions

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Neural Regeneration Research 2020年第5期15卷 944-947页

作者： tetsuya Akaishi Toshiyuki Takahashi Ichiro Nakashima Michiaki Abe Masashi Aoki Tadashi Ishii Department of Education and Support for Regional Medicine Tohoku University HospitalSendaiJapan Department of Neurology Tohoku University Graduate School of MedicineSendaiJapan Department of Neurology National Hospital Organization Yonezawa National HospitalYonezawaJapan Department of Neurology Tohoku Medical and Pharmaceutical UniversitySendaiJapan

Interstitial fluid movement in the brain parenchyma has been suggested to contribute to sustaining the metabolism in brain parenchyma and maintaining the function of neurons and glial *** pulsatile hydrostatic pressure gradient may be one of the driving forces of this bulk ***,osmotic pressure- related factors have not been studied until *** this prospective observational study,to elucidate the relationship between osmolality (mOsm/kg) in the serum and that in the cerebrospinal fluid (CSF),we simultaneously measured the serum and CSF osmolality of 179 subjects with suspected neurological *** osmolality was 283.6 ± 6.5 mOsm/kg and CSF osmolality was 289.5 ± 6.6 mOsm/*** the specific gravity of serum and CSF is known to be 1.024–1.028 and 1.004–1.007,respectively,the estimated average of osmolarity (mOsm/L) in the serum and CSF covered exactly the same range (i.e.,290.5–291.5 mOsm/L).There was strong correlation between CSF osmolality and serum osmolality,but the difference in osmolality between serum and CSF was not correlated with serum osmolality,serum electrolyte levels,protein levels,or quotient of *** conclusion,CSF osmolarity was suggested to be equal to serum *** is not one of the driving forces of this bulk *** factors such as hydrostatic pressure gradient should be used to explain the mechanism of bulk flow in the brain *** study was approved by the Institutional Review Board of the Tohoku University Hospital (approval *** No.2015-1-257) on July 29,2015.

关键词： brain parenchyma bulk flow cerebrospinal fluid hydrostatic pressure interstitial fluid osmolarity osmotic pressure

Spray Pyrolyzed TiO2 Embedded Multi-Layer Front Contact Design for High-Efficiency Perovskite Solar Cells

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Nano-Micro Letters 2021年第2期13卷 262-278页

作者： Md.Shahiduzzaman Mohammad Ismail Hossain Sem Visal tetsuya Kaneko Wayesh Qarony Shinjiro Umezu Koji Tomita Satoru Iwamori Dietmar Knipp Yuen Hong Tsang Md.Akhtaruzzaman Jean-Michel Nunzi tetsuya Taima Masao Isomura Nanomaterials Research Institute(NanoMaRi) Kanazawa UniversityKakumaKanazawa 920-1192Japan Department of Applied Physics and Materials Research Center The Hong Kong Polytechnic UniversityHung HomKowloonHong KongP.R.China Research Institute of Science and Technology Tokai UniversityKitakanameHiratsuka 259-1292Japan Department of Chemistry School of ScienceTokai UniversityKitakanameHiratsuka 259-1292Japan Graduate School of Engineering Tokai UniversityKitakanameHiratsuka 259-1292Japan Department of Modern Mechanical Engineering Waseda University3-4-1 OkuboShinjukuTokyo 169-8555Japan Solar Energy Research Institute The National University of Malaysia43600 BangiSelangorMalaysia Department of Materials Science and Engineering City University of Hong KongKowloonHong KongP.R.China Geballe Laboratory for Advanced Materials Department of Materials Science and EngineeringStanford UniversityStanfordUSA Department of Physics Engineering Physics and AstronomyQueens UniversityKingstonONCanada

The photovoltaic performance of perovskite solar cells(PSCs)can be improved by utilizing efficient front ***,it has always been a significant challenge for fabricating high-quality,scalable,controllable,and cost-effective front *** study proposes a realistic multi-layer front contact design to realize efficient single-junction PSCs and perovskite/perovskite tandem solar cells(TSCs).As a critical part of the front contact,we prepared a highly compact titanium oxide(TiO2)film by industrially viable Spray Pyrolysis Deposition(SPD),which acts as a potential electron transport layer(ETL)for the fabrication of *** and reproducibility of the TiO2 ETL were discreetly investigated while fabricating a set of planar *** the front contact has a significant influence on the optoelectronic properties of PSCs,hence,we investigated the optics and electrical effects of PSCs by three-dimensional(3D)finite-difference time-domain(FDTD)and finite element method(FEM)rigorous *** investigation allows us to compare experimental results with the outcome from ***,an optimized single-junction PSC is designed to enhance the energy conversion efficiency(ECE)by>30% compared to the planar reference ***,the study has been progressed to the realization of all-perovskite TSC that can reach the ECE,exceeding 30%.Detailed guidance for the completion of high-performance PSCs is provided.

关键词： Perovskite Tandem solar cells Spray pyrolysis deposition TiO2 compact layer Optics and optimization Electrical characteristic