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Exact construction of noncommutative instantons

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Frontiers of Mathematics in China 2013年第5期8卷 1031-1046页

作者： masashi HAMANAKA Toshio NAKATSU Department of Mathematics Nagoya University Furocho Chikusa-ku Nagoya 464-8602 Japan Institute for Fundamental Sciences Setsunan University 17-8 Ikeda Nakamachi Neyagawa Osaka 572-8508 Japan

We discuss the Atiyah-Drinfeld-Hitchin-Manin （ADHM） construc- tion of U（N） instantons in noncommutative （NC） space and give some exact instanton solutions for various noncommutative settings. We also present a new formula which is crucial to show an origin of the instanton number for U（1） and to prove the one-to-one correspondence between moduli spaces of the noncommutative instantons and the ADHM data.

关键词： Instantons noncommutative geometry

Association of anastomotic leakage with long-term oncologic outcomes of patients with esophagogastric junction cancer

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World Journal of Gastrointestinal Surgery 2022年第1期14卷 46-55页

作者： masashi Takeuchi Hirofumi Kawakubo Satoru Matsuda Shuhei Mayanagi Tomoyuki Irino Jun Okui Kazumasa Fukuda Rieko Nakamura Norihito Wada Hiroya Takeuchi Yuko kitagawa Department of Surgery Keio University School of MedicineTokyo 160-8582Japan Department of Preventive Medicine and Public Health Keio University School of MedicineTokyo 160-8582Japan Department of Surgery Hamamatsu University School of MedicineShizuoka 431-3192Japan

BACKGROUND Despite improvements in surgical procedures and peri-operative patients management,the postoperative complications in esophagogastric junction(EGJ)cancer remain high because of technical *** studies have indicated the negative influence of postoperative infectious complications on long-term survival after gastrointestinal ***,no study has shown the association between postoperative complications and long-term survival of patients with EGJ *** To elucidate influence of postoperative complications on the long-term outcomes of patients with EGJ *** A total of 122 patients who underwent surgery for EGJ cancer at the Keio University were included in this *** examined the association between complications and long-term oncologic *** In all patients,the 3-year overall survival(OS)rate was 71.9%,and the recurrencefree survival(RFS)rate was 67.5%.Compared with patients without anastomotic leakage,those with anastomotic leakage had poor median OS(8 mo vs not reached,P=0.028)and median RFS(5 mo vs not reached,P=0.055).Among patients with cervical anastomosis,there were not significant differences between patients with and without anastomotic ***,among patients who underwent intrathoracic anastomosis,patients with anastomotic leakage had significantly worse OS(P=0.002)and RFS(P=0.005).CONCLUSION Anastomotic leakage was significantly associated with long-term oncologic outcomes of patients with EGJ cancer,especially those who underwent intrathoracic *** anastomosis with subtotal esophagectomy may be an option for the patients who are at high risk for anastomotic leakage.

关键词： Esophagogastric junction cancer Complication Long-term outcome

Balancing timber production and habitat conservation of Okinawa Rails(Gallirallus okinawae): Application of a harvest scheduling optimization model in subtropical forest in Okinawa, Japan

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Journal of Mountain Science 2019年第12期16卷 2770-2782页

作者： KONOSHIMA masashi YOSHIMOTO Atsushi Faculty of Agriculture University of the Ryukyusi SenbaruNishihara ChoOkinawa903-0213 Japan Institute of Statistical Mathematics(ISM) 10-3 Midori-choTachikawaTokyo 190-8562Japan

Finding the right balance between timber production and the management of forest-dependent wildlife species,present a difficult challenge for forest resource managers and policy makers in Okinawa,Japan.A possible explanation of this can be found in the unique nature of the forest management area which is populated with various kinds of rare and endangered *** issue has been brought to light as a result of the nomination of northern Okinawa Island in 2018 as a candidate for World Natural Heritage *** nomination has raised public awareness to the possibility of conflicting management objectives between timber extraction and the conservation of habitat for forest-dependent wildlife *** exclusively for one objective over the other may fail to meet the demand for both forest products and wildlife habitat,ultimately jeopardizing the stability of human and wildlife *** is therefore important to achieve a better balance between the objective of timber production and conservation of wildlife *** the significance of this subject area,current ongoing discussions on how to effectively manage for forest resources,often lack scientific basis to make sound judgement or evaluate tradeoffs between conflicting *** the effect of these forest management activities on wildlife habitat provides useful and important information needed to make forest management and policy *** this study we develop a spatial timber harvest scheduling model that incorporates habitat suitability index(HSI)models for the Okinawa Rail(Gallirallus okinawae),an endangered avian species found on Okinawa,*** illustrate how the proposed coupling model assembles spatial information,which ultimately aids the study of forest management effects on wildlife habitat,we apply these models to a forest area in Okinawa and conduct a simple simulation analysis.

关键词： Harvest scheduling Habitat suitability index model Optimization model Timber production Wildlife habitat

Electron transfer governed by light-matter interaction at metal-semiconductor interface

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npj Computational Materials 2020年第1期6卷 1628-1635页

作者： Kenji Iida masashi Noda Department of Theoretical and Computational Molecular Science Institute for Molecular ScienceMyodaijiOkazaki 444-8585Japan Center for Computational Sciences University of Tsukuba1-1-1 TennodaiTsukuba 305-8577Japan

The photoexcitation of heterostructures consisting of metallic nanoclusters and a semiconductor has been extensively investigated in relation to interests in photocatalysis and optical *** optoelectronic functions of the heterostructures originate from localized surface plasmon resonance,which can induce electron and resonance energy *** it is well known that photoinduced electronic interaction between a metallic nanocluster and a semiconductor is responsible for the resonance energy transfer,the electron transfer associated with the photoinduced electronic interaction has not been *** this paper,we elucidate the photoexcitation dynamics of a silver nanocluster/TiO_(2) heterostructure using an original first-principles computational approach that explicitly deals with light–matter *** is shown that the photoinduced silver–TiO_(2) electronic interaction causes excited electrons to be directly transferred from the silver nanocluster to the TiO2 layer without passing through the conduction band of the silver nanocluster.

关键词： silver interaction transfer

A sulfur–microporous carbon composite positive electrode for lithium/sulfur and silicon/sulfur rechargeble batteries

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Progress in Natural Science:Materials International 2015年第6期25卷 612-621页

作者： Takuya Takahashi Masaki Yamagata masashi Ishikawa Department of Chemistry and Materials Engineering Faculty of ChemistryMaterials and BioengineeringKansai University

Sulfur is an advantageous material as a promising next-generation positive electrode material for high-energy lithium batteries due to a high theoretical capacity of 1672 m A h g 1although its discharge potential is somewhat modest:ca.2 V vs Li/***,a sulfur positive electrode has some crucial problems for practical use,which are mainly attributed to the dissolution of its intermediate products in charge–discharge *** order to resolve the dissolution problem of lithium polysulfide,we attempted to synthesize a sulfur–microporous activated carbon(AC) composite positive ***,we have systematically researched the battery performance of sulfur–microporous AC positive electrode with variations of electrolytes as well as negative electrodes,and found its promising positive electrode performance for a nextgeneration rechargeable battery.

关键词： Sulfur Micropore Ionic liquid Silicon Lithium-ion battery

Numerical study on ship-generated unsteady waves based on a Cartesian-grid method

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Journal of Hydrodynamics 2020年第5期32卷 953-968页

作者： Kyung-Kyu Yang masashi Kashiwagi Yonghwan Kim Department of Naval Architecture and Ocean Engineering Seoul National UniversitySeoulKorea Department of Naval Architecture and Ocean Engineering Osaka UniversityOsakaJapan

The added resistance of a ship in waves can be related to ship-generated unsteady *** the present study,the unsteady wave-pattern analysis is applied to calculate the added resistance in waves for two modified Wigley models using a Cartesian-grid *** the present numerical method,a first-order fractional-step method is applied to the velocity-pressure coupling in the fluid domain,and one of volume-of-fluid(VOF)methods is adopted to capture the fluid interface.A ship is embedded in a Cartesian grid,and the volume fraction of the ship inside the grid is calculated by identifying whether each grid is occupied by liquid,gas,and solid *** sensitivity to the location of measuring position of unsteady waves as well as the number of solution grids is *** added resistance computed by direct pressure integration and wave pattern analysis is compared with experimental *** addition,nonlinear characteristics of the added resistance in waves are investigated by detailed analyses of unsteady flow field and resulting wave pattern.

关键词： Unsteady wave pattern added resistance in waves Cartesian-grid method grid convergence index

Multi-disciplinary Conceptual Design Knowledge of Multi-stage Hybrid Rocket Using Data Mining Technique

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Journal of Mechanics Engineering and Automation 2015年第1期5卷 1-9页

作者： Masahiro Kanazaki Kazuhisa Chiba Koki kitagawa Toru Shimada masashi Nakamiya Department of Aerospace Engineering Graduate School of System Design Tokyo Metropolitan University Tokyo 191-0065Japan Graduate School of Engineering Hokkaido University of Science Sapporo 006-8585 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara 252-5210 Japan Research Institute for Sustainable Humanosphere Kyoto University Kyoto 606-8501 Japan

This paper deals with the application of data mining techniques to the conceptual design knowledge for a LV （launch vehicle） with a HRE （hybrid rocket engine）. This LV is a concept of the space transportation, which can deliver micro-satellite to the SSO （sun-synchronous orbit）. To design the higher performance LV with HRE, the optimum size of each component, such as an oxidizer tank containing liquid oxidizer, a combustion chamber containing solid fuel, a pressurizing tank and a nozzle, should be acquired. The Kriging based ANOVA （analysis of variance） and SOM （self-organizing map） are employed as data mining techniques for knowledge discovery. In this study, the paraffin （FT-0070） is used as a propellant of HRE. Then, the relationship among LV performances and design variables are investigated through the analysis and the visualization. To calculate the engine performance, the regression rate is computed based on an empirical expression. The design knowledge is extracted for the design knowledge of the multi-stage LV with HRE by analysis using ANOVA and SOM. As a result, the useful design knowledge on the present design problem is obtained to design HRE for space transportation.

关键词： Hybrid rocket data mining techniques multidisciplinary design

What make differences in the outcome of adjuvant treatments for resected gastric cancer?

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World Journal of Gastroenterology 2014年第33期20卷 11567-11573页

作者： Toshifusa Nakajima masashi Fujii Department of Gastrointestinal Surgery Cancer Institute Ariake Hospital Tokyo 135-8550 Japan The vice president Japan Cancer Clinical Research Organization (JACCRO) Chuo-ku Tokyo 104-0061 Japan Department of Surgery Nihon University Surugadai Hospital Tokyo 101-0062 Japan

After a long history of Dark Age of adjuvant chemotherapy for gastric cancer, definite evidences of survival benefit from adjuvant treatment have been reported since 2000 s. These survival benefits are likely attributed to something new approach different from pervious studies. In 2001, South West Oncology Group INT0116 trial yielded survival benefit in curatively resected gastric cancer patients with postoperative chemoradiotherapy [5-fluorouracil(5-FU) + Leucovorin + radiotherapy], followed by positive result by MAGIC Trial, employing perioperative(pre- and postoperative chemotherapy with Epirubicin, cisplatin(CDDP), 5-fluorouracil(ECF) regimen in patients with curative resection. A novel drug [S1: ACTS-GC(Adjuvant chemotherapy trial of TS-1 for gastric cancer) in 2007], or new drug combination chemotherapys [CDDP + 5-FU: FNCLCC/FFCD(Federation Nationale des Centres de Lutte contre le cancer/Federation Francophone de Cancerologie Digestive) in 2011, Capecitabine + Oxaliplatin: CLASSIC in 2012] also produced positive results in terms of improved prognosis. Neoadjuvant or perioperative chemotherapy, novel anti-cancer drugs, and chemoradiotherapy might be the key words to develop further improvement in the adjuvant treatment of resectable gastric cancer. Moreover, it is not new but still true to stress the importance of D2 surgery as the baseline treatment in order to minimize the amount of residual tumor after surgery.

关键词： Resected gastric cancer Phase Ⅲ clinical trial Adjuvant and neo-adjuvant therapy Chemoradio-therapy Review

Effects of Aspect Ratio in a Transonic Shock Tube Airfoil Flow

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Journal of Thermal Science 2012年第5期21卷 435-440页

作者： masashi KASHITANI Keita MIURA Shinichiro NAKAO Yutaka YAMAGUCHI Department of Aerospace Engineering National Defense Academy1-10-20 Hashirimizu Yokosuka 239-8686 JAPAN Department of Mechanical Engineering Nagasaki Institute of Applied Science 536 Aba-MachiNagasaki 851-0193 JAPAN

In the present study, the flow visualizations were performed around the NACA 0012 models which differ in aspect ratios. We discussed the effects of the aspect ratio in the test models. Additionally the unsteady, two-dimensional, compressible Euler equations were solved for the NACA 0012 airfoil. Experiments were performed utilizing the conventional gas driven shock tube as the intermittent transonic wind tunnel. The aspect ratios of the models are about 0.86 and 1.5, respectively. The Mach numbers M 2 are about 0.84. The Reynolds numbers of the present experimental conditions were constant that Re based on chord length is about 4.0×10 5 . The results are as follows: in different aspect ratios, the difference of the shock wave location is confirmed though the Mach number and Reynolds number are same. It indicates the different correction Mach number by the effects of the side wall boundary layer though the nominal Mach number measured the same value. Also, on the difference of shock wave location for the effects of the aspect ratio, the tend of CFD shows the qualitative agreement with the result of an experiment.

关键词： Shock tube Aerodynamics Transonic flows Aspect ratio Wind tunnel correction