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Multicentric recurrence of intraductal papillary neoplasm of bile duct after spontaneous detachment of primary tumor:A case report

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World Journal of Clinical Cases 2022年第3期10卷 1000-1007页

作者： Hiroki Fukuya Akifumi Kuwano Shigehiro Nagasawa Yusuke Morita Kosuke Tanaka masayoshi Yada Akihide Masumoto Kenta Motomura Department of Hepatology Iizuka HospitalIizuka 820-8505FukuokaJapan

BACKGROUND Intraductal papillary neoplasm of the bile duct(IPNB)rarely recurs in a multicentric *** encountered a patient with multiple recurrences of the gastric subtype of IPNB one year after spontaneous detachment of the primary tumor during peroral cholangioscopy(POCS).CASE SUMMARY A 68-year-old woman on maintenance hemodialysis because of lupus nephritis had several cardiovascular diseases and a pancreatic intraductal papillary mucinous neoplasm(IPMN).She was referred to our department for dilation of the common bile duct(CBD)and a tumor in the lumen,detected using *** had no complaints,and blood tests of hepatobiliary enzymes were *** resonance cholangiopancreatography(MRCP)showed a papillary tumor in the CBD with a filling defect detected using endoscopic retrograde cholangiography(ERC).Intraductal ultrasonography revealed a papillary tumor and stalk at the *** POCS,the tumor spontaneously detached with its stalk into the *** showed low-intermediate nuclear atypia of the gastric subtype of *** 1 year,follow-up MRCP showed multiple tumors distributed from the left hepatic duct to the *** and POCS showed multicentric *** was alive without hepatobiliary symptoms at least two years after initial diagnosis of *** The patient experienced gastric subtype of IPNB without curative *** may be reasonable for patients with this subtype.

关键词： Bile duct neoplasm Neoplasm Recurrence Pancreatic intraductal neoplasms Magnetic resonance cholangiopancreatography Endoscopic retrograde cholangiography Peroral cholangioscopy Case report

Optical second-harmonic generation measurement for probing organic device operation

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Light(Science & Applications) 2015年第1期4卷 99-108页

作者： Takaaki Manaka Mitsumasa iwamoto Department of Physical Electronics Tokyo Institute of Technology2-12-1 O-okayamaMeguro-kuTokyo 152-8552Japan

We give a brief overview of the electric-field induced optical second-harmonic generation(EFISHG)technique that has been used to study the complex behaviors of organic-based *** analyzing EFISHG images of organic field-effect transistors,the in-plane two-dimensional distribution of the electric field in the channel can be *** susceptibility tensor of the organic semiconductor layer and the polarization of the incident light are considered to determine the electric field *** imaging can effectively evaluate the distribution of the vectorial electric field in organic films by selecting a light *** the time-resolved technique,measurement of the electric field originating from the injected carriers allows direct probing of the carrier motion under device operation,because the transient change of the electric field distribution reflects the carrier *** applications of the EFISHG technique to organic electronic devices are reviewed.

关键词： electric field optical second-harmonic generation semiconductor device

A Variable-Parameter-Model-Based Feedforward Compensation Method for Tracking Control

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IEEE/CAA Journal of Automatica Sinica 2020年第3期7卷 693-701页

作者： Dailin Zhang Zining Wang masayoshi Tomizuka School of Mechanical Science and Engineering State Key Laboratory of Digital Manufacturing Equipment and TechnologyHuazhong University of Science and TechnologyWuhan 430074China Department of Mechanical Engineering University of California at BerkeleyBerkeley CA 94720 USA IEEE

Base on the accurate inverse of a system, the feedforward compensation method can compensate the tracking error of a linear system dramatically. However, many control systems have complex dynamics and their accurate inverses are difficult to obtain. In the paper, a variable parameter model is proposed to describe a system and a multi-step adaptive seeking approach is used to obtain its parameters in real time. Based on the proposed model, a variable-parameter-model-based feedforward compensation method is proposed, and a disturbance observer is used to overcome the influence of the model uncertainty. Theoretical analysis and simulation results show that the variable-parametermodel-based feedforward compensation method can obtain better performance than the traditional feedforward compensation.

关键词： Disturbance observer feedforward compensation iterative learning control parameter identification system model

Newly-generated Daliangshan Fault Zone—Shortcutting on the central section of Xianshuihe-Xiaojiang fault system

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Science China Earth Sciences 2008年第9期51卷 1248-1258页

作者： IKEDA Yasutaka TOGO masayoshi TAJIKARA masayoshi ECHIGO Tomoo OKADA Shinsuke Department of Earth and Planetary Science University of TokyoTokyo 113-0033 Japan Hosei University Tokyo 194-0298 Japan

The Daliangshan fault zone is the eastern branch in the central section of Xianshuihe-Xiaojiang fault system. It has been neglected for a long time, partly because of no destructive earthquake records along this fault zone. On the other hand, it is located on the remote and inaccessible plateau. So far it was excluded as part of the Xianshuihe-Xiaojiang fault system. Based on the interpretation of aerophotographs and field investigations, we document this fault zone in detail, and give an estimation of strike-slip rate about 3 mm/a in Late Quaternary together with age dating data. The results suggest that the Daliangshan fault zone is a newly-generated fault zone resulted from shortcutting in the central section of Xianshuihe-Xiaojiang fault system because of the clockwise rotation of the Southeastern Tibetan Crustal Block, which is bounded by the Xianshuihe-Xiaojiang fault system. Moreover, the shortcutting may make the Daliangshan fault zone replace the Anninghe and Zemuhe fault zones gradually, and finally, the later two fault zones will probably die out with the continuous clockwise rotation.

关键词： Daliangshan fault zone newly-generated fault Xianshuihe-Xiaojiang fault system southeast Tibet

Low-temperature GaAs-based plasmonic photoconductive terahertz detector with Au nano-islands

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Photonics Research 2020年第9期8卷 1448-1456页

作者： HIRONARU MURAKAMI TOMOYA TAKARADA AND masayoshi TONOUCHI Institute of Laser Engineering Osaka University2-6 Yamada-okaSuitaOsaka 565-08771Japan

We have fabricated low-temperature grown GaAs(LT-GaAs)-based plasmonic photoconductive antennas by RF sputtering of Au nanoparticles and have evaluated their terahertz detection *** surface plasmon resonance enhances the electric fields near the surface and increases the optical absorption of *** resonance frequency depends on the density of electrons,the effective electron mass,and the size and shape of the ***,we tried to develop a high-sensitivity LT-GaAs photoconductive detector(PCD),which is effective over a wide range of wavelengths,by RF sputtering of Au nano-islands with a variety of aspect ratios from 1.2 to 5.1 on the dipole gap region of the *** a result,we succeeded in increasing the sensitivity by 29%and 40%in the amplitude of observed terahertz pulse for 800 nm and 1560 nm femtosecond laser excitations,respectively.

关键词： photoconductive antennas plasmon

Effect of impact deformation on shape recovery behavior in Fe-Mn-Si shape memory alloy under shape memory training process with cyclic thermo-mechanical loading

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Science China(Technological Sciences) 2021年第7期64卷 1389-1400页

作者： SUN Qian CAO Bo iwamoto Takeshi SUO Tao Graduate School of Engineering Hiroshima UniversityHigashi-Hiroshima739-8527Japan Cluster of Excellence livMatS@FIT-Freiburg Center for Interactive Materials and Bioinspired Technologies University of FreiburgFreiburgD-79110Germany Academy of Science and Technology Hiroshima UniversityHigashi-Hiroshima739-8527Japan School of Aeronautics Northwestern Polytechnical UniversityXi’an710072China

In the past studies, it has been discovered that the shape memory effect(SME) in the Fe-Mn-Si shape memory alloy(Fe-SMA)can gradually be enhanced by a pre-process called as shape memory training process under cyclic thermo-mechanical *** the other hand, it has been shown that the SME of Fe-SMA can also be affected by changing the strain rate. Therefore, it is possible to improve the SME by combining the strain rate sensitivity and shape memory training process. However, the improvement of SME caused by the training process under impact condition is still unclear. For the training process under impact condition, it is difficult to interrupt the test at the desired strain level due to many reflections of stress waves, which reload the specimen from the free ends. In this paper, to obtain reliable experimental results of SME after the training process under impact condition, the stress waves after first loading are eliminated by the double momentum-trap structure introduced into the impact tensile testing apparatus based on the split Hopkinson pressure bar method. In order to achieve an optimum design of the structure used in experiments, the finite element simulation of the structure is performed. Then, tensile tests in the training process of Fe-28Mn-6Si-5Cr alloy at different strain rates including the impact level are conducted and temperature change of the specimen is measured during training and heating process. As a result, the improvement of SME in the alloy after the training process under quasi-static and impact loading is compared with that under quasi-static loading through verification processes.

关键词： Fe-Mn-Si shape memory alloy training cyclic thermo-mechanical process split Hopkinson pressure bar momentumtrap impact deformation

Rapid,noncontact,sensitive,and semiquantitative characterization of buffered hydrogen-fluoridetreated silicon wafer surfaces by terahertz emission spectroscopy

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Light(Science & Applications) 2022年第12期11卷 2982-2993页

作者： Dongxun Yang Abdul Mannan Fumikazu Murakami masayoshi Tonouchi Institute of Laser Engineering Osaka University 2-6 YamadaokaSuitaOsaka 565-0871Japan

Advances in modern semiconductor integrated circuits have always demanded faster and more sensitive analytical methods on a large-scale *** surface of wafers is fundamentally essential to start building circuits,and quantitative measures of the surface potential,defects,contamination,passivation quality,and uniformity are subject to *** present study provides a new approach to access those by means of terahertz(THz)emission *** femtosecond laser illumination,THz radiation,which is sensitive to the surface electric fields of the wafer,is ***,we systematically research the THz emission properties of silicon surfaces under different surface conditions,such as the initial surface with a native oxide layer,a fluorine-terminated surface,and a hydrogenterminated ***,a strong doping concentration dependence of the THz emission amplitude from the silicon surface has been revealed in different surface conditions,which implies a semiquantitative connection between the THz emission and the surface band bending with the surface ***-induced THz emission spectroscopy is a promising method for evaluating local surface properties on a wafer scale.

关键词： terminated fluoride fluorine

WISE Infrared Search for Young Stellar Objects Associated with Starless Cores

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International Journal of Astronomy and Astrophysics 2023年第2期13卷 89-111页

作者： Susumu Sato Yuri iwamoto Yoichi Itoh Nishi-Harima Astronomical Observatory Center for Astronomy University of Hyogo Hyogo Japan

This study presents the results of an infrared search of young stellar objects (YSOs) associated with cores with high optical extinction and no associated infrared IRAS source. Four hundred YSO candidates were identified in the WISE photometric catalog based on the infrared excess attributed to the circumstellar materials and proto-planetary disks. One-hundred and forty-nine cores do not have YSO candidates. Whereas, 32 cores harbor only Class I candidates and 107 cores have Class II candidates. Ninety-one cores that were previously identified as starless cores, were found to contain YSOs. The ratio of the number of starless cores to the number of star-forming cores suggests that the typical timescale from molecular cloud core formation to the birth of a star is in the range of 0.5 - 1.4 Myr.

关键词： Stars: Formation ISM: Clouds Infrared: Stars

Study of Forced Convection Heat Transfer of Supercritical CO_(2) in a Horizontal Channel by Lattice Boltzmann Method

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Advances in Applied Mathematics and Mechanics 2010年第5期2卷 564-572页

作者： Xiaodong Niu Hiroshi Yamaguchi Yuhiro iwamoto Xinrong Zhang Mingjun Li Yuhiro iwamoto Department of Mechanical Engineering Doshisha UniversityKyo-Tanabe-ShiKyoto 610-0321Japan Department of Energy and Resources Engineering College of EngineeringPeking UniversityBeijing 100871P.R.China Department of Mechanical Engineering Xiangtan UniversityHunan 411105P.R.China

The problem of forced convection heat transfer of supercritical CO_(2) in a horizontal channel is investigated numerically by a lattice Boltzmann *** study is stimulated by our recent experimental findings on solar collectors using supercritical CO_(2) as a working fluid,which can achieve the collector efficiency high up to 70%.To deeply understand the heat transfer characteristics of supercritical CO_(2) and provide a theoretical guidance for improving our current experimental system,in present study several typical experimental flow conditions are *** particular,the work focuses on the convective heat transfer characteristics of supercritical CO_(2) flowing in a horizontal channel with mediate Reynolds numbers ranging from 210 to 840 and constant heat fluxes from 400.0 to 800.0 W/m^(2).The simulations show that the heat transfer increases with heat flux and decreases with Reynolds ***,the mechanisms of heat transfer enhancement of supercritical CO_(2) fluid are identified.

关键词： Forced convection supercritical CO_(2) lattice Boltzmann method