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Numerical Analysis of Electrically Tunable Delay-Line with an SSB Modulator

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光学学报 2003年第S1期23卷 619-620页

作者： tetsuya Kawanishi Masayuki Izutsu Communications Research Laboratory 4-2-1 Nukui-kita Koganei Tokyo 184-8795 JapanCommunications Research Laboratory 4-2-1 Nukui-kita Koganei Tokyo 184-8795 Japan

By using an optical system simulator, we investigated the tunable delay-line with an optical SSB modulator and an optical fiber loop, where the delay can be controlled by the electric signal fed to the modulator.

关键词： SSB be of Numerical Analysis of Electrically Tunable Delay-Line with an SSB Modulator were FBG line into with

Two cases of adenocarcinoma occurring in sporadic fundic gland polyps observed by magnifying endoscopy with narrow band imaging

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World Journal of Gastroenterology 2016年第40期22卷 9028-9034页

作者： Kazumi Togo tetsuya Ueo Hirotoshi Yonemasu Hideho Honda tetsuya Ishida Hiroshi Tanabe Kenshi Yao Akinori Iwashita Kazunari Murakami Departments of Gastroenterology Oita Red Cross Hospital Departments of Pathology Oita Red Cross Hospital Department of Pathology Fukuoka University Chikushi Hospital Department of Endoscopy Fukuoka University Chikushi Hospital Department of Gastroenterology Faculty of Medicine Oita University

Gastric fundic gland polyps(FGPs) are common nonadenomatous gastric polyps arising from normal fundic mucosa without Helicobacter pylori(H. pylori) infection. Although systemic FGPs associated with familial adenomatous polyposis(FAP) often have dysplasia, there are few reports of dysplasia occurring in sporadic F G P s, e s p e c i a l l y w h e n d e t e c t e d b y m a g n i f y i n g endoscopy with narrow band imaging(ME-NBI). We experienced two cases of adenocarcinoma occurring in sporadic FGPs, and their ME-NBI findings were very useful for differentiating FGP with cancer from nondysplastic FGP. A 68-year-old man and a 63-year-old woman were referred to our institution for medical checkup. H. pylori was negative in both patients. Endoscopic examination revealed a small reddishpolypoid lesion on the anterior wall of the upper gastric body and several FGPs. ME-NBI showed an irregular microvascular architecture composed of closed loop- or open loop-type vascular components, plus an irregular microsurface structure composed of oval-type surface components which was different from that of FGPs. FAP was denied because of the absence of colon polyps and no familial history of FAP. Pathological diagnosis was adenocarcinoma occurring in sporadic FGP.

关键词： Sporadic type Adenocarcinoma Magnifying endoscopy with narrow band imaging Adenocarcinoma without Helicobacter pylori infection Fundic gland polyp

Formation mechanism of extension fractures induced by excavation of a gallery in soft sedimentary rock,Horonobe area,Northern Japan

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Geoscience Frontiers 2013年第1期4卷 105-111页

作者： tetsuya Tokiwa Kimikazu Tsusaka Makoto Matsubara Taiki Ishikawa Daisuke Ogawa Horonobe Underground Research Unit Japan Atomic Energy AgencyHokkaido 098-3224Japan Geoscience Research Laboratory Kanagawa 242-0014Japan Mitsubishi Materials Techno Corporation Tokyo 102-8205Japan

This paper focuses on the formation mechanism of fractures induced by excavation of a gallery in soft sedimentary rocks in the Horonobe area of Japan. Detailed fracture mapping of the gallery indicates that the fractures consist of both pre-existing shear fractures and excavation damaged zone （EDZ） fractures. EDZ fractures correspond to weak planes associated with bedding planes or transgranular cracks. The EDZ fractures terminate against pre-existing shear fractures. Therefore, even for excavations in soft sedimentary rocks, formation of the EDZ fractures are controlled by pre-existing fractures and earlier weak planes.

关键词： Fracture Excavation damaged zone (EDZ)Weak plane Soft rock Excavation

Eco-morphological characteristics of fern species for slope conservation

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Journal of Mountain Science 2019年第3期16卷 504-515页

作者： Laura SANCHEZ-CASTILLO Ken’ichirou KOSUGI Naoya MASAOKA tetsuya KUBOTA Faculty of Forestry Sciences Autonomous University of Nuevo Leon Forest and Biomaterials Science Division Graduate School of AgricultureKyoto University Forest Environment Science Division Faculty of AgricultureKyushu University

Degradation of slopes due to shallow landslide and the subsequent erosional processes are a big challenge on the application of soil bioengineering techniques; that is the use of plants as main structural components of a slope protection and conservation system. An optimal application of soil bioengineering techniques should include not only the technical factor of plants as structural components but also the ecology of species and the plant adaptations to disturbances, which is crucial if a longterm successful slope restoration system is intended. Ferns are a dominant understory vegetation species in the forest of Japan, but its characteristics and influences on the recovery of shallow landslide scars have not been fully studied yet. This study aims to find out the ecological characteristics of fern species through the calculation of ecological indicators and the quantification of the morphological features of specimens growing on disturbed and non-disturbed forest slopes in Japan. Gleichenia japonica was found as the vegetation species with biggest ecological indicators on both slopes. The analysis of morphological characteristics of the specimens growing on both sites showed that the development of the specimens is focused in below-ground characteristics. The pull-out force of Gleichenia japonica root system as an indicator of ecological adaptation to a constraint environment and morphological characteristics quality is influenced by height and root length according to the principal component analysis. The eco-morphological characteristics of species can be used as an indicator of an optimal element in soil bioengineering establishment for slope conservation proposes. The long and fibrous root system could be placed on forest roads, steep or small slopes where space limitation is an issue for the establishment of bigger species and if the slope conditions allow it, it can control soil losses due to rainfall and provide stability.

关键词： Slope conservation Soil bioengineering Root system Shallow landslide Natural regeneration

GPI-Anchored Proteins Cooperate in the Long Journey of the Pollen Tube

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Molecular Plant 2020年第1期13卷 8-10页

作者： Shihao Su Takuya T.Nagae tetsuya Higashiyama Institu te of Transformative Bio-Molecules(WPI-ITbM) Nagoya UniversityFuro-choChikusa-kuNagoyaAichi 464-8601Japan Division of Biological Science Graduate School of ScienceNagoya UniversityFuro-choChikusa-kuNagoyaAichi 464-8602Japan Department of Biological Sciences Graduate School of ScienceThe University of TokyoTokyo 113-0033Japan

During the reproductive process of flowering plants, the pollen tube acts as a transportation carrier for two sperm cells, interacts with various female tissues, delivers the sperm to the ovule, and achieves double fertilization. Successful fertilization relies on fine growth control of the pollen tube tip in female tissues. This includes maintenance of pollen tube integrity in the pistil transmitting tract and the timing of rupture of the pollen tube when it reaches the female ovule ( Higashiyama, 2018 , Ge et al., 2019a ).

关键词： female GPI tube

Study of Unsteady Flow Simulation of Backward Impeller with Non-uniform Casing

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Journal of Thermal Science 2017年第3期26卷 208-213页

作者： War War Min Swe Hiroya MORIMATSU Hidechito HAYASHI tetsuya OKUMURA Ippei ODA Nagasaki University 1-14 Bunkyo-machiNagasaki 852-8521Japan Panasonic Ecology Systems Co. Ltd.4017 Aza Shimonakata takaki-choKasugai486-8522Japan

The flow characteristics of the centrifugal fans with different blade outlet angles are basically discussed on steady and unsteady simulations for a rectangular casing fan. The blade outlet angles of the impellers are 35° and 25° respectively. The unsteady flow behavior in the passage of the impeller 35° is quite different from that in the steady flow behavior. The large flow separation occurs in the steady flow field and unsteady flow field of the impeller 35°, the flow distribution in the circumferential direction varies remarkably and the flow separation on the blade occurs only at the back region of the fan; but the steady flow behavior in the impeller 25° is almost consistent with the unsteady flow behavior, the flow distribution of the circumferential direction doesn't vary much and the flow separation on the blade hardly occurs. When the circumferential variation of the flow in the impeller is large, the steady flow simulation is not coincident to the unsteady flow simulation.

关键词： Centrifugal fan Impeller Blade outlet angles Steady and unsteady simulation Rectangular casing

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

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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

Tone Modulation in a Passive OTDM Multiplexer for Clock Recovery from a 160 Gbit/s OTDM Signal

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光学学报 2003年第S1期23卷 591-592页

作者： tetsuya. Miyazaki Fumito Kubota Communications Research Laboratory 4-2-1 Nukui-kita Koganei Tokyo 184-8795 JapanCommunications Research Laboratory 4-2-1 Nukui-kita Koganei Tokyo 184-8795 Japan

Tone modulation in a passive OTDM multiplexer for clock recovery from a 160-Gbit/s OTDM signal by using a base-rate receiver is demonstrated. We performed synchronous demultiplexing in back-to-back arrangement and opt... 详细信息

关键词： OTDM Tone Modulation in a Passive OTDM Multiplexer for Clock Recovery from a 160 Gbit/s OTDM Signal in for from

Effects of reductive annealing on insulating polycrystalline thin films of Nb-doped anatase TiO2:recovery of high conductivity

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Journal of Semiconductors 2016年第2期37卷 10-13页

作者： Shoichiro Nakao Yasushi Hirose tetsuya Hasegawa Kanagawa Academy of Science and Technology(KAST) Kawasaki 213-0012Japan Japan Science and Technology Agency CRESTBunkyoTokyo 113-0033Japan Department of Chemistry The University of TokyoBunkyoTokyo 113-0033Japan

We studied the effects of reductive annealing on insulating polycrystalline thin films of anatase Nb- doped TiO2 （TNO）. The insulating TNO films were intentionally fabricated by annealing conductive TNO films in oxygen ambient at 400 ℃. Reduced free carrier absorption in the insulating TNO films indicated carrier com- pensation due to excess oxygen. With H2-annealing, both carrier density and Hall mobility recovered to the level of conducting TNO, demonstrating that the excess oxygen can be efficiently removed by the annealing process without introducing additional scattering centers.

关键词： transparent conductive oxide Nb-doped TiOa pulsed laser deposition