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Study of the Jet-Induced Mixing of Two-Layer Density-Stratified Fluid in a Rectangular Tank

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Journal of Energy and Power Engineering 2015年第2期9卷 117-127页

作者： Shogo Shakouchi shota fukue Tomomi Uchiyama Development Section Chubu Electric Power Co. Inc. Naszova 461-8680 Japan Graduate School of lnformation Science Nagoya University Nagoya 464o8601 Japan EcoTopia Science Institute Nagoya University Nagoya 464-8603 Japan

The mixing phenomena of a two-layer density-stratified fluid induced by a jet in a tank are experimentally investigated. The upper and lower fluids are water and a NaCl-water solution, respectively, with the lower fluid issued vertically upward from a nozzle at the bottom of the tank. The jet Reynolds number Re, defined by the jet velocity and the water kinematic viscosity, ranges from 90 to 4,200. The mass concentration of the NaCl-water solution Co is less than 0.08. The flow visualization makes clear the jet behavior relative to the density interface between the upper and lower fluids. The measurement of the concentration distribution of the water paint issued with the jet highlights the effects of Re and Co on the mixing between the jet and the ambient fluid. The measurement of the fluid velocity distribution with a PIV （particle image velocimetry） system successfully elucidates the relationship between the velocity field and the resultant mixing.

关键词： Jet density-stratified fluid mixing intrusion concentration PIV.

Behavior of a Jet Issuing Diagonally Upward into Two-Layer Density-Stratified Fluid in a Cylindrical Tank

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Journal of Flow Control, Measurement & Visualization 2017年第3期5卷 51-64页

作者： Tomohiro Degawa shota fukue Tomomi Uchiyama Akira Ishikawa Koji Motoyama Institute of Materials and Systems for Sustainability Nagoya University Nagoya Japan Mitsubishi Electric Co. Tokyo Japan Chubu Electric Power Co. Inc. Nagoya Japan

This study is concerned with the experimental investigation of a jet issuing diagonally upward into a two-layer density-stratified fluid in a cylindrical tank and the resulting mixing phenomena. The upper and lower fluids are water and an aqueous solution of sodium chloride (NaCl), respectively, and the lower fluid issues from a nozzle on the bottom of the tank. The angle between the centerline of the jet and the bottom of the tank is 60o, and the mass concentration of the NaCl solution is 0.02. The investigation reveals that secondary flow is caused by the jet in the horizontal cross-sections of the tank and that it is composed of a pair of vortices. It confirms that the secondary flow at the density interface corresponds to an internal density current. The investigation also clarifies the effect of the Reynolds number of the jet on mixing between the lower and upper fluids.

关键词： Jet Density-Stratified Fluid Mixing Secondary Flow Density Current

Optimal energy consuming planning for a home-based microgrid with mobility constraint of electric vehicles and tractors

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Control Theory and Technology 2021年第4期19卷 465-483页

作者： shota Inuzuka Tielong Shen Faculty of Science and Technology Sophia University7-1 KioichoChiyoda-kuTokyoJapan

This research deals with the energy management problem to minimize the cost of non-renewable energy for a small-scale microgrid with electric vehicles(EV)and electric tractors(ET).The EVs and ETs function as batteries in the power system,while they often have to leave it for their mobility and agricultural *** State of Charge(SoC),which is the charge rate of the battery from 0 to 1,and the operating time of ETs are optimized under the assumption that the required electrical energy,the arrival and departure time of EVs,and the working time of ETs are given by users,but they include *** this paper,we deal with these uncertainties by constraints for robust energy planning and expected optimization based on scenarios,and show that the scheduling of the SoC assuming the worst case and the optimal home-based power consumption planning that considers the cost of each scenario corresponding to each variation can be *** proposed method is formulated as a mixed-integer linear programming(MILP),and numerical simulations show that the optimal cooperative operation among multiple houses can be obtained and its global optimal or sub-optimal solution can be quickly obtained by using CPLEX.

关键词： Microgrid Electric vehicle(EV) Stochastic scheduling MILP

Coprecipitation mechanisms of Zn by birnessite formation and its mineralogy under neutral pH conditions

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Journal of Environmental Sciences 2022年第11期34卷 136-147页

作者： shota Tajima Shigeshi Fuchida Chiharu Tokoro Graduate School of Creative Science and Engineering Waseda University3-4-1 OkuboShinjuku-kuTokyo 169-8555Japan Faculty of Science and Engineering Waseda University3-4-1 OkuboShinjuku-kuTokyo 169-8555Japan Faculty of Engineering The University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8656Japan

Birnessite(δ-Mn(IV)O_(2))is a great manganese(Mn)adsorbent for dissolved divalent *** this study,we investigated the coprecipitation mechanism of δ-MnO_(2) in the presence of Zn(II)and an oxidizing agent(sodium hypochlorite)under two neutral pH values(6.0 and 7.5).Themineralogical characteristics and Zn–Mn mixed products were compared with simple surface complexation by adsorption modeling and structural *** coprecipitation experiments at different Zn/Mn molar ratios showed a Langmuir-type isotherm at pH 6.0,which was similar to the result of adsorption experiments at pH 6.0 and 7.5.X-ray diffraction and X-ray absorption fine structure analysis revealed triple-corner-sharing innersphere complexation on the vacant sites was the dominant Zn sorption mechanism on δ-MnO_(2) under these experimental conditions.A coprecipitation experiment at pH 6.0 produced some hetaerolite(ZnMn(Ⅲ)_(2)O_(4))and manganite(γ-Mn(Ⅲ)OOH),but only at low Zn/Mn molar ratios(<1).These secondary precipitates disappeared because of crystal dissolution at higher Zn/Mn molar ratios because they were thermodynamically ***(ZnMn(IV)_(3)O_(7)•2H_(2)O)was produced in the coprecipitation experiment at pH 7.5 with a high Zn/Mn molar ratio of *** resulted in a Brunauer–Emmett–Teller(BET)-type sorption isotherm,in which formation was explained by transformation of the crystalline structure ofδ-MnO_(2) to a tunnel *** experiments demonstrate that abiotic coprecipitation reactions can induce Zn–Mn compound formation on theδ-MnO_(2) surface,and that the pH is an important controlling factor for the crystalline structures and thermodynamic stabilities.

关键词： δ-MnO2 Zinc removal Surface complexation X-ray absorption fine structure

Discrete dislocation plasticity analysis of dispersion strengthening in oxide dispersion strengthened(ODS) steels

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Journal of Central South University 2014年第4期21卷 1249-1255页

作者： Akiyuki Takahashi shota Sato Department of Mechanical Engineering Faculty of Science and TechnologyTokyo University of Science

A discrete dislocation plasticity analysis of dispersion strengthening in oxide dispersion strengthened(ODS) steels was described. Parametric dislocation dynamics(PDD) simulation of the interaction between an edge dislocation and randomly distributed spherical dispersoids(Y2O3) in bcc iron was performed for measuring the influence of the dispersoid distribution on the critical resolved shear stress(CRSS). The dispersoid distribution was made using a method mimicking the Ostwald growth mechanism. Then, an edge dislocation was introduced, and was moved under a constant shear stress condition. The CRSS was extracted from the result of dislocation velocity under constant shear stress using the mobility(linear) relationship between the shear stress and the dislocation velocity. The results suggest that the dispersoid distribution gives a significant influence to the CRSS, and the influence of dislocation dipole, which forms just before finishing up the Orowan looping mechanism, is substantial in determining the CRSS, especially for the interaction with small dispersoids. Therefore, the well-known Orowan equation for determining the CRSS cannot give an accurate estimation, because the influence of the dislocation dipole in the process of the Orowan looping mechanism is not accounted for in the equation.

关键词： parametric dislocation dynamics oxide dispersion strengthened steel Orowan mechanism critical resolved shear stress dislocation dipole

Gene expression during genital morphogenesis in the ground beetle Carabus maiyasanus

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Insect Science 2020年第5期27卷 975-986页

作者： shota Nomura Tomochika Fujisawa Teiji Sota Department of Zoology Graduate School of ScienceKyoto UniversitySakyoKyotoJapan

To investigate the developmental genetics of genital formation in the carabid beetle Carabus maiyasanus,we compared gene expression patterns among five stages using transcriptomic RNA sequencing data from abdominal segments and genitalia in the third(last)larval instar(including prepupa)and pupal *** identified 18839 genes,of which 10796 were differentially expressed among stages or between *** were relatively few differentially expressed genes(DEGs)between the sexes(3%).The DEGs were clustered into six groups,mainly according to stage-specific expression *** in clusters 1-3 showed high expression levels before pupation and low expression levels during the pupal period,whereas genes in clusters 46 showed high expression levels from the prepupal to the pupal *** related to the initial pupation process and differentiation of genital discs in Drosophila were involved in clusters 4 and 6 and showed low expression levels at early third instar and elevated expression levels from the early prepupal stage,suggesting that the pupation process and genital differentiation started in the prepupal *** 4 and 5 included developmental genes related to organ size control,which may be important in the formation of internal genital structures during the pupal stage.

关键词： Carabus genitalia Ohomopterus pupation RNA-seq transcriptome

Influence of texture feature size on spherical silicon solar cells

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Rare Metals 2006年第z1期25卷 115-120页

作者： HAYASHI shota MINEMOTO Takashi TAKAKURA Hideyuki HAMAKAWA Yoshihiro College of Science and Engineering Ritsumeikan University 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan

The effects of surface texturing on spherical silicon solar cells were investigated. Surface texturing for spherical Si solar cells was prepared by immersing p-type spherical Si crystals in KOH solution with stirring. Two kinds of texture feature sizes (1 and 5 μm pyramids) were prepared by changing stirring speed. After fabrication through our baseline processes, these cells were evaluated by solar cell performance and external quantum efficiency. The cell with 1 and 5 μm pyramids shows the short circuit current density (Jsc) value of 31.9 and 33.2 mA·cm-2, which is 9% and 13% relative increase compared to the cell without texturing. Furthermore, the cell with 5 μm pyramids has a higher open-circuit voltage (0.589 V) than the cell with 1 μm pyramids (0.577 V). As a result, the conversion efficiency was improved from 11.4% for the cell without texturing to 12.1% for the cell with 5 μm pyramids.

关键词： solar cell spherical silicon texturing alkali etching

Shrink-induced graphene sensor for alpha-fetoprotein detection with low-cost self-assembly and label-free assay

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Frontiers of Mechanical Engineering 2017年第4期12卷 574-580页

作者： shota SANDO Bo ZHANG Tianhong CUI Department of Mechanical Engineering University of MinnesotaMinneapolis MN 55455 USA

Combination of shrink induced nano-compo- sites technique and layer-by-layer （LbL） self-assembled graphene challenges controlling surface morphology. Adjusting shrink temperature achieves tunability on graphene surface morphology on shape memory polymers, and it promises to be an alternative in fields of high- surface-area conductors and molecular detection. In this study, self-assembled graphene on a shrink polymer substrate exhibits nanowrinkles after heating. Induced nanowrinkles on graphene with different shrink tempera- ture shows distinct surface roughness and wettability. As a result, it becomes more hydrophilic with higher shrink temperatures. The tunable wettability promises to be utilized in, for example, microfluidic devices. The graphene on shrink polymer also exhibits capability of being used in sensing applications for pH and alpha- fetoprotein （AFP） detection with advantages of label free and low cost, due to self-assembly technique, easy functionalization, and antigen-antibody reaction on gra- phene surface. The detection limit of AFP detection is down to 1 pg/mL, and therefore the sensor also has a significant potential for biosensing as it relies on low-cost self-assembly and label-free assay.

关键词： graphene self-assembly shrink polymer,AFP label-free biosensor

Comparisons of the suture zones along a geotraverse from the Scythian Platform to the Arabian Platform

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Geoscience Frontiers 2014年第6期5卷 855-875页

作者： Ali Yilmaz shota Adamia Hüseyin Yilmaz Cumhuriyet University Engineering FacultyDepartment of Environmental EngineeringKayseri StreetCU.CampusTR-58140 SivasTurkey Nodia Institute of Geophysics 1M.Alexidze Str.0195TbilisiGeorgia Cumhuriyet University Engineering FacultyDepartment of Geophysical EngineeringTR-58140 SivasTurkey

The area from the Greater Caucasus to the southeast Turkey is characteri：;.ed and shaped by several major continental blocks. These are Scythian Platform, Pontian-Transcaucasu.,; Continent-Arc System （PTCAS）, the Anatolian-lranian and the Arabian Platforms. The aim of this paper is to define these continental blocks and describe and also compare their boundary relationships along the suture zones. The Scythian Platform displays the evidence of the Hercynian and Alpine orogens. This platform is separated from the PTCAS by the Greater Caucasus Suture Zone. The incipient collision began along this suture zone before middle-late Carboniferous whereas the final collision occurred before Oligocene. The PTCAS can be divided into four structural units：（1） the Georgian Block - northern part of the Pontian-Transcaucasian island-arc, （2） the southern and eastern Black Sea Coast-Adjara-Trialeti Unit, （3） the Artvin-Bolnisi Unit, comprising the northern part of the southern Transcaucasus, and （4） the Imbricated Bayburt-Garabagh Unit. The PTCAS could be separated from the Anatolian Iranian Platform by the North Anatolian-Lesser Caucasus Suture （NALCS） zone. The initial collision was developed in this suture zone during Senonian-early Eocene and final collision before middle Eocene or Oligocene-Miocene. The Anatolian-lranian Platform （AIP） is made up of the Tauride Platform and its metamorphic equivalents together with Iranian Platform. It could be separated from the Arabian Platform by the Southeastern Anatolian Suture （SEAS） zone. The collision ended before late Miocene along this suture zone. The southernmost continental block of the geotraverse is the Arabian Platform, which constitutes the northern part of the Arabian-African Plate. This platform includes a sequence from the Precambrian felsic volcanic and clastic rocks to the Campanian-early Maastrichtian fiyschoidal clastics. All the suture zones include MORB and SSZ-types ophiolites in different ages. However, the ages of

关键词： Scythian Plattorm Arabian Platform Suture zones Ceotraverse