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Ultrafast reorientation of the Néel vector in antiferromagnetic Dirac semimetals

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npj Computational Materials 2021年第1期7卷 1562-1568页

作者： Atsushi Ono Sumio ishihara Department of Physics Tohoku UniversitySendai 980-8578Japan

Antiferromagnets exhibit distinctive characteristics such as ultrafast dynamics and robustness against perturbative fields,thereby attracting considerable interest in fundamental physics and technological ***,it was revealed that the Néel vector can be switched by a current-induced staggered(Néel)spin-orbit torque in antiferromagnets with the parity-time symmetry,and furthermore,a nonsymmorphic symmetry enables the control of Dirac ***,the real-time dynamics of the magnetic and electronic structures remain largely ***,we propose a theory of the ultrafast dynamics in antiferromagnetic Dirac semimetals and show that the Néel vector is rotated in the picosecond timescale by the terahertz-pulse-induced Néel spin-orbit torque and other torques originating from magnetic *** reorientation accompanies the modulation of the mass of Dirac fermions and can be observed in real time by the magneto-optical *** results provide a theoretical basis for emerging ultrafast antiferromagnetic spintronics combined with the topological aspects of materials.

关键词： materials Dirac metals

Partitioned Method of Insect Flapping Flight for Maneuvering Analysis

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Computer Modeling in Engineering & Sciences 2019年第10期121卷 145-175页

作者： Minato Onishi Daisuke ishihara Kyushu Institute of Technology 680-4 KawazuIizuka Fukuoka820-8502Japan

This study proposed a partitioned method to analyze maneuvering of insects during flapping *** method decomposed the insect flapping flight into wing and body subsystems and then coupled them via boundary conditions imposed on the wing’s base using one-way *** the wing subsystem,the strong coupling of the flexible wings and surrounding fluid was accurately analyzed using the finite element method to obtain the thrust forces acting on the insect’s *** resulting thrust forces were passed from the wing subsystem to the body subsystem,and then rigid body motion was analyzed in the body *** rolling,yawing,and pitching motions were simulated using the proposed method as follows:In the rolling simulation,the difference of the stroke angle between the right and left wings caused a roll *** the yawing simulation,the initial feathering angle in the right wing only caused a yaw *** the pitching simulation,the difference between the front-and back-stroke angles in both the right and left wings caused a pitch *** three torques generated maneuvering motion comparable with that obtained in actual observations of insect *** results demonstrate that the proposed method can adequately simulate the fundamental maneuvers of insect flapping *** the present simulations,the maneuvering mechanisms were investigated at the governing equation level,which might be difficult using other ***,the proposed method will contribute to revealing the underlying insect flight mechanisms.

关键词： Insect flapping flight maneuverability fluid-structure interaction partitioned method projection method strongly coupled method one-way coupling finite element method

The effect of the 18R-LPSO phase on the fatigue behavior of extruded Mg/LPSO two-phase alloy through a comparative experimental-numerical study

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Journal of Magnesium and Alloys 2021年第1期9卷 130-143页

作者： Fabien Briffod Takayuki Shiraiwa manabu Enoki Department of Materials Engineering The University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8656Japan

The fatigue behavior of four extruded Mg-Y-Zn alloys containing different volume fractions of long-period stacking ordered(LPSO)grains was investigated through a comparative study combining experiments and crystal plasticity finite element *** controlled low-cycle fatigue experiments were conducted at different strain amplitudes and revealed a limited cyclic hardening in Mg_(89)Zn_(4)Y_(7)alloy or softening in Mg_(99.2)Zn_(0.2)Y_(0.6)and Mg_(97)Zn_(1)Y_(2)alloys.A decrease in the fatigue life against the plastic strain with the increase in LPSO phase volume fraction was observed and was related the limited ductility of extruded LPSO ***-strain hysteresis curves were used to calibrate and validate a crystal plasticity model taking into account twinning and *** interaction of the different phases on the distribution of local micro-mechanical fields at the grain scale was then analyzed on synthetic microstructures under strain-controlled *** twinning activity was predicted in coarse unrecrystallized grains and tended to disappear with the increase in the LPSO phase volume ***-like facets observed in LPSO grains were related to high tensile stress,especially at the Mg/LPSO interface,due to the limited number of deformation mechanisms in LPSO crystal to accommodate out-of-basal plane *** increase of the fatigue limit with the increase in LPSO phase volume fraction was finally associated with the decreasing presence of coarse unrecrystallizedα-Mg grains due to a higher dynamic recrystallization activity during the extrusion process.

关键词： Magnesium alloy Fatigue Long-period stacking ordered phase Crystal plasticity Finite element method

Two-step Design of Critical Control Systems Using Disturbance Cancellation Integral Controllers

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International Journal of Automation and computing 2011年第1期8卷 37-45页

作者： Tadashi ishihara Takahiko Ono Faculty of Science and Technology Fukushima University Graduate School of Information Sciences Hiroshima City University

An efficient critical control system design is proposed in this paper. The key idea is to decompose the design problem into two simpler design steps by the technique used in the classical loop transfer recovery method （LTR）. The disturbance cancellation integral controller is used as a basic controller. Since the standard loop transfer recovery method cannot be applied to the disturbance cancellation controller, the nonstandard version recently found is used for the decomposition. Exogenous inputs with constraints both on the amplitude and rate of change are considered. The majorant approach is taken to obtain the analytical sufficient matching conditions. A numerical design example is presented to illustrate the effiectiveness of the proposed design.

关键词： Critical control systems principle of inequalities principle of matching majorants disturbance cancellation controller integral controller loop transfer recovery (LTR).

Molecular Functions of Oxygen-Evolving Complex Family Proteins in Photosynthetic Electron Flow

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Journal of Integrative Plant Biology 2010年第8期52卷 723-734页

作者： Kentaro Ifuku Seiko ishihara Fumihiko Sato Graduate School of Biostudies Kyoto University

Oxygen-evolving complex （OEC） protein is the original name for membrane-peripheral subunits of photosystem （PS） II. Recently, multiple isoforms and homologs for OEC proteins have been iden- tified in the chloroplast thylakoid lumen, indicating that functional diversification has occurred in the OEC family. Gene expression profiles suggest that the Arabidopsis OEC proteins are roughly categorized into three groups： the authentic OEC group, the stressresponsive group, and the group including proteins related to the chloroplast NAD（P）H dehydrogenase （NDH） complex involved in cyclic electron transport around PSI. Based on the above gene expression profiles, molecular functions of the OEC family proteins are discussed together with our current knowledge about their functions.

关键词： NDH Molecular Functions of Oxygen-Evolving Complex Family Proteins in Photosynthetic Electron Flow OEC PSII PPL

Effect of End Plates on the Performence of a Wells Turbine for Wave Energy Conversion

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Journal of Thermal Science 2006年第4期15卷 319-323页

作者： manabu Takao Toshiaki Setoguchi YoichiKinoue KenjiKaneko Department of Mechanical Engineering Matsue National College of Technology 14-4 Nishiikuma-choMatsue-shiShimane 690-8518Japan Institute of Ocean Energy Saga University1 Honjo-machiSaga-shiSaga 840-8502Japan Department of Mechanical Engineering Saga University1 Honjo-machiSaga-shiSaga 840-8502Japan

In order to improve the performance of the Wells turbine for wave energy conversion, the effect of end plates on the turbine characteristics has been investigated experimentally by model testing under steady flow conditions. The end plate attached to the tip of the original rotor blade is slightly larger than the original blade profile. The characteristics of the Wells turbine with end plates have been compared with those of the original Wells turbine, i.e., the turbine without end plate. As a result, it has been concluded that the characteristics of the Wells turbine with end plates are superior to those of the original Wells turbine and the characteristics are dependent on the size and position of end plate. Furthermore, the effect of annular plate on the turbine performance, which encircles the turbine and is attached to the tip, was investigated as an additional experiment. However, its device was not effective in improving the turbine characteristics.

关键词： fluid machinery natural energy Wells turbine end plate wave energy conversion ocean energy.

Steroid-sparing strategies in the management of ulcerative colitis:Efficacy of leukocytapheresis

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World Journal of Gastroenterology 2012年第41期18卷 5833-5838页

作者： manabu Shiraki Takayuki Yamamoto Inflammatory Bowel Disease Center Yokkaichi Social Insurance Hospital Yokkaichi Mie 510-0016 Japan

Active ulcerative colitis （UC） is frequently associated with infiltration of a large number of leukocytes into the bowel mucosa. Leukocytapheresis is a novel nonphar- macologic approach for active UC, in which leukocytes are mechanically removed from the circulatory system. Current data indicate that leukocytapheresis is effica- cious in improving response and remission rates with excellent tolerability and safety in patients with UC. Corticosteroid therapy remains a mainstay in the treat- ment of active UC, however, long-term, high doses of corticosteroids usually produce predictable and po- tentially serious side effects. If leukocytapheresis can spare patients from exposure to corticosteroids, the risk of steroid-induced adverse events should be mini- mized. This may be of great benefit to patients because severe side effects of steroids seriously impair health- related quality of life. In this article, we reviewed cur- rent evidence on whether leukocytapheresis can avoid or reduce the use of corticosteroids in the manage- ment of patients with UC. Several studies have shown that leukocytapheresis was effective for steroid-nafve patients with active UC. Furthermore, both short-term and long-term studies have demonstrated the steroid- sparing effects of leukocytapheresis therapy in patients with UC. Although the evidence level is not striking, theavailable data suggest that leukocytapheresis can avoid or reduce the use of corticosteroids in the management of UC. Large, well-designed clinical trials are necessary to more accurately evaluate the steroid-sparing effects of leukocytapheresis in the management of UC.

关键词： Corticosteroid Granulocyte and monocyteadsorptive apheresis Leukocytapheresis Steroid-naivepatients Steroid-sparing effect Ulcerative colitis

Cubic Spiral Transition Matching G^(2) Hermite End Conditions

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Numerical Mathematics(Theory,Methods and Applications) 2011年第4期4卷 525-536页

作者： Zulfiqar Habib manabu Sakai COMSATS Institute of Information Technology Department of Computer ScienceDefense RoadOff Raiwind RoadLahorePakistan Department of Mathematics&Computer Science Koorimoto 1-21-35Kagoshima 890-0065Japan

This paper explores the possibilities of very simple analysis on derivation of spiral regions for a single segment of cubic function matching positional,tangential,and curvature end *** are curves of monotone curvature with constant sign and have the potential advantage that the minimum and maximum curvature exists at their end ***,spirals are free from singularities,inflection points,and local curvature *** properties make the study of spiral segments an interesting problem both in practical and aesthetic applications,like highway or railway designing or the path planning of non-holonomic mobile *** main contribution is to simplify the procedure of existence methods while keeping it stable and providing flexile constraints for easy applications of spiral segments.

关键词： Path planning spiral cubic Bézier G2 Hermite Computer-Aided Design(CAD) computational geometry

Comparing salinity tolerance in embryonic and larval development of two species of water strider, Aquarius paludum and Gerris latiabdominis （Hemiptera： Gerridae）

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Insect Science 2013年第4期20卷 524-530页

作者： manabu Kishi Tetsuo Harada Kenji Fujisaki Laboratory of Insect Ecology Graduate School of Agriculture Kyoto University Laboratory of Environmental Physiology Faculty ofEducation Kochi University Kochi Japan

Water strider Aquarius paludum （Fabricius） is a cosmopolitan species colonizes mainly freshwater but occasionally brackish habitats throughout the Palearctic and Oriental regions. Water strider Gerris latiabdominis （Miyamoto） is a common species in Japan lives in temporary habitats as freshwater paddy fields. These two species often occur syntopically. We investigated differences in the developmental response to brackish water during embryonic and larval stages between the two species. Eggs were exposed to 0-1.8% NaC1 solutions within 24 h of oviposition. Larvae of G. latiabdominis were exposed to salinities of 0, 0.5%, and 0.9% from the first instar until adult emergence. Limits of NaC1 concentration for hatching were 1.3% and 1.0% for A. paludum and G. latiabdominis, respectively. The hatching rate of G. latiabdominis was lower than that ofA. paludum at salinities 〉0.9%. The period of embryonic development of G. latiabdominis was more prolonged than that ofA. paludum at a given salinity. Although the salinity tolerance of G. latiabdominis was lower than that ofA. paludum, our results suggest G. latiabdominis has the physiological capacity to expand into brackish waters. High and low salinity tolerances of A. paludum and G. latiabdominis, respectively, reflect the relatively wide range of habitat salinities utilized by A. paludum and the relatively restricted habitats preferred by G. latiabdominis. The high salinity tolerance ofA. paludum could be an important factor contributing to their cosmopolitan distribution because high tolerance to salinity means the possibility of them to be dispersed via ocean or sea to other continents and islands.

关键词： embryo larva salinity tolerance water strider