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粒子网格混合方法模拟液滴夹带起始点

哈尔滨工业大学学报 2013年第5期45卷 91-94页

作者：郭赟石渡佑树池尻智史冈芳明哈尔滨工程大学核科学与技术学院哈尔滨150001 东京大学原子力学专攻日本3191188

环状流动的特性对反应堆事故工况分析具有重要意义,本研究基于粒子网格混合方法对这一现象中的液滴夹带起始点问题进行了数值分析,利用网格求解流场,利用粒子模拟液膜及液滴的运动,探讨了气水流动大密度比情况下,不同流动方向,不同流体... 详细信息

环状流动的特性对反应堆事故工况分析具有重要意义,本研究基于粒子网格混合方法对这一现象中的液滴夹带起始点问题进行了数值分析,利用网格求解流场,利用粒子模拟液膜及液滴的运动,探讨了气水流动大密度比情况下,不同流动方向,不同流体粘度,不同液膜厚度下的液滴夹带所需的临界气相流速,结果同经典关系式进行了对比,吻合良好.这一方法对于反应堆事故中的两相流动研究具有参考意义.

关键词：粒子网格液滴夹带环状流数值模拟反应堆事故

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粒子网格混合方法的并行化研究

核科学与工程 2013年第3期33卷 260-264页

作者：郭赟石渡佑树池尻智史冈芳明核科学与技术学院哈尔滨工程大学黑龙江哈尔滨150001 东京大学日本东海村茨城县3191188

粒子网格混合方法在求解两相流动问题时耗时巨大,本文对此提出了一种基于MPI(Message Passing Interface)环境的并行算法,其中包括并行求解网格与粒子两部分。通过与原有串行程序对比验证了并行化的正确性,通过实例计算证明该方法在一... 详细信息

粒子网格混合方法在求解两相流动问题时耗时巨大,本文对此提出了一种基于MPI(Message Passing Interface)环境的并行算法,其中包括并行求解网格与粒子两部分。通过与原有串行程序对比验证了并行化的正确性,通过实例计算证明该方法在一定范围内可以缩短计算时间,对于改进粒子网格混合方法与扩大其应用范围具有一定的参考价值。

关键词：混合方法并行计算

Spatiotemporal changes in antlerless proportion of culled Sika deer in relation to deer density

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Journal of Forestry Research 2022年第3期33卷 1095-1101页

作者： Kei K.Suzuki Teruki oka Masatoshi Yasuda Kyushu Research Center Forestry and Forest Products Research InstituteKumamoto860-0862Japan Shikoku Research Center Forestry and Forest Products Research InstituteKochi780-8077Japan

Population management of herbivores is widely applied to decrease damage to forests in the northern hemisphere. Culling more antlerless deer, including females and fawns, is an effective means of reducing the population and helps to improve management efficiency. To increase the efficiency of antlerless-biased culling, we assessed the spatiotemporal distribution of the antlerless ratio in culled sika deer (Cervus nippon) in relation to population density. We hypothesized that the antlerless ratio is higher at the center of the distribution than at the margins of the deer’s range, because dispersal processes differ according to sex and age: Young male deer first disperse into an unoccupied area, and then males may become established in the new area for approximately 10–15 years before the number of females increases. A statistical model revealed spatiotemporal changes in the antlerless ratio of culled sika deer. The change in the ratio basically fit the density distribution of the deer, which was estimated independently on the basis of fecal pellet count surveys. The antlerless ratio estimated from the model increased asymptotically as deer density rose. The results support our hypothesis and suggest that antlerless sika deer will be more easily culled at the center rather than at the margins of the distribution range. These findings should help to increase the efficiency of managing the deer via antlerless-biased culling.

关键词： Antlerless Culling Density Distribution Large herbivore Wildlife management

Modelling of a shape memory alloy actuator for feedforward hysteresis compensator considering load fluctuation

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CAAI Transactions on Intelligence Technology 2022年第4期7卷 549-560页

作者： Seiji Saito Shouta oka Ribun Onodera Department of Electronics and Information Science Polytechnic UniversityKodairaTokyoJapan

This paper presents a hysteresis mathematical model of a shape memory alloy(SMA)actuator for feedforward hysteresis *** hysteresis model represents the relation between temperature,stress,and electric ***,based on the laws of thermodynamics,the hysteresis model of the SMA actuator is ***,the inverse of the hysteresis model is obtained to produce a compensator for non‐linear characteristics such as hysteresis and ***,the parameters of the hysteresis model are obtained from each experiment under constant load and constant temperature,and the model validity is confirmed by comparing experimentally obtained ***,the inverse model is applied to a part of feedforward hysteresis *** order to verify the effectiveness of the proposed model as hysteresis compensator,an electrical resistance control using feedback-feedforward control was conducted by numerical *** simulation results indicate advantages of the proposed mathematical model in hysteresis compensation of SMA actuator,and demonstrate that the model is capable of handling load fluctuation.

关键词： hysteresis inverse thermodynamics

Measurements of the Ca II infrared triplet lines of young stellar objects

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Research in Astronomy and Astrophysics 2013年第10期13卷 1189-1201页

作者： Yoichi Itoh Keiko Moto'oka Yoichi Itoh The Saga Prefecture Space & Science Museum 16351 Nagashima Takeo Takeo Saga 843-0021 Japan Nishi-Harima Astronomical Observatory Center for Astronomy University of Hyogo 407-2 Nishigaichi Sayo Hyogo 679-5313 Japan yitoh @nhao.jp

Equivalent widths and line widths of Ca II infrared triplet emission lines were measured in the high-resolution optical spectra of 39 young stellar *** found that the equivalent widths of the emission lines decrease with stellar *** has often been claimed that strong chromospheric activity is generated by a dynamo process caused by fast rotation of the ***,we found no clear correlation between the strength of the Ca II lines and the stellar rotation ***,we found that the objects with high mass accretion rates had stronger Ca II emission *** correlation supports the turbulent chromosphere model or the magnetic accretion theory for classical T Tauri *** also noticed that the equivalent widths of Ca II lines in transitional disk objects are one-tenth of those in classical T Tauri stars,even if the masses of the circumstellar disks are comparable.

关键词： stars:pre-main sequence stars:emission lines

Reactivity improvement of ilmenite by calcium nitrate melt infiltration for Chemical Looping Combustion of biomass

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Carbon Resources Conversion 2019年第1期2卷 51-58页

作者： Martin Keller Hikaru oka Junichiro Otomo Graduate School of Frontier Sciences The University of Tokyo5-1-5 KashiwanohaKashiwa-shiChiba 277-8563Japan

Chemical Looping Combustion is a novel process that generates sequestration-ready CO_(2) from the combustion of woody biomass without requiring a gas separation step and without diluting the CO_(2) with N_(2) from *** is achieved by oxidizing the fuel with lattice oxygen of a metal oxide oxygen *** using cheap and abundant ilmenite ore(FeTiO3)as the oxygen carrier,the rather low reactivity towards volatiles released from the biomass upon devolatilization,as well as detrimental structural changes due to a segregation of Fe and Ti in the material,are of *** issues can be addressed by modifying ilmenite with Ca via melt *** this work,we demonstrate that this modification results in a good distribution of Ca throughout the ilmenite particles that a)prevents detrimental Fe/Ti segregation,b)improves the mechanical stability of the particle compared to materials prepared by solution impregnation and c)improves the reactivity of this material towards hydrogen and wet ***,fixed bed experiments showed that the Ca modification not only resulted in increased methane conversion,but also in an increased degree of oxidation of gaseous intermediates CO and *** thus conclude that the performance of ilmenite in Chemical Looping processes can be significantly enhanced by Ca modification of ilmenite either prior to use or in-situ during operation of this bed material with Ca-rich fuels such as woody biomass.

关键词： Carbon dioxide removal Chemical Looping Combustion Ilmenite Melt infiltration BECCS Biomass combustion

Polynomial Normal Form of a Plane Curve with a Given Weight Sequence

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Chinese Quarterly Journal of Mathematics 1995年第4期10卷 53-61页

作者： Mutsuo oka Department of

ＰｏｌｙｎｏｍｉａｌＮｏｒｍａｌＦｏｒｍｏｆａＰｌａｎｅＣｕｒｖｅｗｉｔｈａＧｉｖｅｎＷｅｉｇｈｔＳｅｑｕｅｎｃｅ￥ＭｕｔｓｕｏＯＫＡ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＴｏｋｙｏＩｎｓｔｉｔｕｔｅｏｆ... 详细信息

ＰｏｌｙｎｏｍｉａｌＮｏｒｍａｌＦｏｒｍｏｆａＰｌａｎｅＣｕｒｖｅｗｉｔｈａＧｉｖｅｎＷｅｉｇｈｔＳｅｑｕｅｎｃｅ￥ＭｕｔｓｕｏＯＫＡ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＴｏｋｙｏＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｌｏｇｙ，Ｏｈ－Ｏｋａ...

关键词：平面曲线多项式加权序列法线式存在定理

New insight into the exotic states strongly coupled with the DD^(*)from the T_(cc)^(+)

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Science Bulletin 2024年第19期69卷 3036-3041页

作者： Guang-Juan Wang Zhi Yang Jia-Jun Wu Makoto oka Shi-Lin Zhu KEK Theory Center Institute of Particle and Nuclear Studies(IPNS)High Energy Accelerator Research Organization(KEK)Tsukuba 305-0801Japan School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China School of Physical Sciences University of Chinese Academy of Sciences(UCAS)Beijing 100049China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China Advanced Science Research Center Japan Atomic Energy AgencyTokai 319-1195Japan Nishina Center for Accelerator-Based Science RIKENWako 351-0198Japan School of Physics and Center of High Energy Physics Peking UniversityBeijing 100871China

We have investigated the internal structure of the open-and hidden-charmed(DD^(*)/DD^(*))molecules in the unified *** first fit the experimental lineshape of the Tt state and extract the DD^(*)interaction,from which the T is assumed to arise *** we obtain the DD^(*)interaction by charge *** results show that the DD*interaction is attractive but insufficient to form X(3872)as a bound ***,its formation requires the crucial involvement of the coupled channel effect between the DD^(*)and cc components,although the cc accounts for approximately 1%*** X(3872),we have obtained a higher-energy state around 3957.9 MeV with a width of 16.7 MeV,which may be a potential candidate for the X(3940).In J^(PC)=1^(+-)sector,we have found two states related to the iso-scalar X(3872)and h_(c)(2P),*** combined study provides valuable insights into the nature of these DD^(+)/DD^(+)exotic states.

关键词： Quark model Charmonium(-like)states Coupled-channel effect Exotic hadrons

Effects of zincate treatment on adhesion of electroless Ni-P coating onto various aluminum alloys

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中国有色金属学会会刊：英文版 2009年第4期19卷 814-818页

作者： Makoto HINO Koji MURAKAMI Yutaka MITO oka Ken MURAoka Teruto KANADANI Industrial Technology Research Institute of okayama Prefecture okayama University of Science

The effects of alloying elements on zincate treatment and adhesion of electroless Ni-P coating onto various aluminum alloy substrates were *** morphology of zinc deposits in the 1st zincate treatment and its adhesion were changed depending on the alloying *** zinc deposits in the 2nd zincate treatment became thinly uniform,and the adhesion between aluminum alloy substrate and Ni-P coating was improved irrespective of the alloying *** analysis revealed the existence of zinc on the surface of each aluminum alloy substrate after the pickling in 5% nitric *** zinc on the surface should be an important factor influencing the morphology of zinc deposit at the 2nd zincate treatment and its adhesion.

关键词：化学镀镍锌酸盐铝合金治疗合金涂层粘连合金元素表面形貌