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Comparison of two projection methods for modeling incompressible flows in MPM

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Journal of Hydrodynamics 2017年第3期29卷 405-412页

作者： shyamini Kularathna kenichi s.ga Department of Engineering Geotechnical and Environmental Research GroupUniversity of Cambridge Department of Civil and Environmental Engineering University of California Berkeley

Material point method（MPM）was originally introduced for large deformation problems in solid mechanics ***,it has been successfully applied to solve a wide range of material ***,previous research has indicated that MPM exhibits numerical instabilities when resolving incompressible flow *** study Chorin＇s projection method in MPM algorithm to simulate material *** projection-type schemes,non-incremental projection and incremental projection,are investigated for their accuracy and stability within *** examples show that the non-incremental projection scheme provides stable results in single phase MPM ***,it avoids artificial pressure oscillations and small time steps that are present in the explicit MPM approach.

关键词： Chorin's projection method material point method(MPM) incompressible flow time step

Production of composites with high relative permittivity using the spouted bed technique

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Particuology 2019年第1期17卷 184-189页

作者： E. Eichner P.-K. Fischer s. Heinrich ga schneider Institute of solids Process Engineering and Particle Technology Denickestr1521073 HamburgGermany Institute of Advanced Ceramics Hamburg University of TechnologyDenickestr1521073 HamburgGermany

This contribution presents a new application of the spouted bed technique. The developed production process involves coating fine copper particles with a polymer in a spouted bed plant and then hot pressing the produced granules to form a compact consisting of a copper–polymer composite with a high filling degree. The fabricated composites possess high relative permittivity, which is advantageous for the production of effective capacitors. With increasing filling degree of copper, the relative permittivity of the composites increased, with a maximum relative permittivity of 214 obtained for the composite containing 78.1 vol% copper. such a high filling degree can be achieved with conductive particles without obtaining a conductive composite by using the spouted bed technology in the production process. The high relative permittivity results from the high filling degree of particles isolated by a polymer coating.

关键词： spouted bed High relative permittivity Fine particles Coating Metal-polymer composite

A Note on solutions for Asymptotically Linear Elliptic systems

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Acta Mathematicae Applicatae sinica 2008年第3期24卷 511-522页

作者： Lei-ga Zhao Department of Mathematics Beijing University of Chemical Technology 100029 Beijing China Academy of Mathematics and systems science Chinese Academy of Sciences Beijing 100190 China Department of Mathematics Yunnan Normal University Kunming 650092 China

In this paper, we are concerned with the elliptic system of{ -△u＋V（x）u=g（x,v）, x∈R^N, -△v＋V（x）v=f（x,u）, x∈R^N, where V（x） is a continuous potential well, f, g are continuous and asymptotically linear as t→∞. The existence of a positive solution and ground state solution are established via variational methods.

关键词： Elliptic system ground state solution variational methods concentration-compactness principle

switch mode capacitive pressure sensors

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Microsystems & Nanoengineering 2022年第6期8卷 47-60页

作者： Nabil shalabi Kyle searles kenichi Takahata Department of Electrical and Computer Engineering University of British ColumbiaVancouverBC V6T 1Z4Canada school of Biomedical Engineering University of British ColumbiaVancouverBC V6T 1Z3Canada

switch mode capacitive pressure sensors are proposed as a new class of microfabricated devices that transform pressure into a mechanically switching capacitance to form an analog-to-digital signal with zero power,high sensitivity,and a high signal-to-noise ratio.A pressure-sensitive gold membrane suspended over a capacitive cavity makes ohmic contact with patterned gold leads on the substrate,closing circuits to fixed on-chip capacitors outside the cavity and leading to significant step *** function is achieved by allocating the switch leads on the part of the counter electrode area,while the remaining area is used for touch mode analog capacitive *** sensor microchip is prototyped through a novel design approach to surface micromachining that integrates micro-Tesla valves for vacuum sealing the sensor cavity,showing an unprecedented response to applied *** a gauge pressure range of 0–120 mmHg,the sensor exhibits an increase of 13.21 pF with resultant switch events,each of which ranges from 2.53–3.96 pF every 12–38 mmHg,in addition to the touch mode linear capacitive increase between *** equivalent sensitivity is 80–240 fF/mmHg,which is 11–600×more than commercial and reported touch mode sensors operating in similar pressure *** sensor is further demonstrated for wireless pressure tracking by creating a resonant tank with the sensor,showing a 32.5–101.6 kHz/mmHg sensitivity with frequency jumps led by the switch *** developed sensor,with its promising performance,offers new application opportunities in a variety of device areas,including health care,robotics,industrial control,and environmental monitoring.

关键词： mode cavity sealing

Failure behavior of soil-rock mixture slopes based on centrifuge model test

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Journal of Mountain science 2019年第8期16卷 1928-1942页

作者： WANG Teng ZHANG ga state Key Laboratory of Hydroscience and Engineering Tsinghua University

The stability of soil-rock mixtures(sRMs) that widely distributed in slopes is of significant concern for slope safety evaluation and disaster prevention. The failure behavior of sRM slopes under surface loading conditions was investigated through a series of centrifuge model tests considering various volumetric gravel contents. The displacement field of the slope was determined with image-based displacement system to observe the deformation of the soil and the movement of the block during loading in the tests. The test results showed that the ultimate bearing capacity and the stiffness of sRM slopes increased evidently when the volumetric block content exceeded a threshold value. Moreover, there were more evident slips around the blocks in the sRM slope. The microscopic analysis of the block motion showed that the rotation of the blocks could aggravate the deformation localization to facilitate the development of the slip surface. The high correlation between the rotation of the key blocks and the slope failure indicated that the blocks became the dominant load-bearing medium that influenced the slope failure. The blocks in the sliding body formed a chain to bear the load and change the displacement distribution of the adjacent matrix sand through the block rotation.

关键词： soil rock mixture slope stability slope failure Centrifuge model test

DATA CRYsTALLIZATION APPLIED FOR DEsIGNING NEW PRODUCTs

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Journal of systems science and systems Engineering 2007年第1期16卷 34-49页

作者： kenichi HORIE Yoshiharu MAENO Yukio OHsAWA school of Engineering the University of Tokyo Graduate school of system Management the University of Tsukuba maeno

It is only the observable part of the real world that can be stored in data. For such incomplete and ill-structured data, data crystallizing aims at presenting the hidden structure among events including unobservable events. This is realized by data crystallization, where dummy items, corresponding to potential existence ofunobservable events, are inserted to the given data. These dummy items and their relations with observable events are visualized by applying KeyGraph to the data with dummy items, like the crystallization of snow where dusts are involved in the formation of crystallization of water molecules. For tuning the granularity level of structure to be visualized, the tool of data crystallization is integrated with human＇s process of understanding significant scenarios in the real world. This basic method is expected to be applicable for various real world domains where previous methods of chance-discovery lead human to successful decision making. In this paper, we apply the data crystallization with human-interactive annealing （DCHA） to the design of products in a real company. The results show its effect to industrial decision making.

关键词： Chance discovery data crystallization unobservable events human machine interaction,design

POLYMERIZATION OF LACTIC O-CARBOXYLIC ANHYDRIDE UsING ORgaNOMETALLIC CATALYsTs

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Chinese Journal of Polymer science 2011年第2期29卷 197-202页

作者： kenichi Oyaizu Hiroyuki Nishide 陈学思 Department of Applied Chemistry Waseda UniversityTokyo 169-8555Japan Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of Sciences

The ring-opening polymerization of 5-methyl-1,3-dioxolane-2,4-dione（lactic O-carboxylic anhydride,LacOCA） using organometallic complexes,including Co（Ⅲ） complexes with schiff base ligands,Tin（Ⅱ） alphatates and Al（Ⅲ） complexes with schiff base ligands,was *** polymerization was carried out by treatment of the organometallic complexes with LacOCA in toluene under mild *** corresponding poly（lactic acid） was characterized by spectroscopy and thermal analyses,which revealed insight into the structure of the effective catalyst for the polymerization of LacOCA.

关键词： Organometallic Poly(lactic acid) Ring-opening polymerization

Automatic Generation of 3D Building Models with Multiple Roofs

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Tsinghua science and Technology 2008年第S1期13卷 368-374页

作者： kenichi sugihara Yoshitugu Hayashi Faculty of Information Media Gifu Keizai University Graduate school of Environmental studies Nagoya University

Based on building footprints (building polygons) on digital maps, we are proposing the GIs and CG integrated system that automatically generates 3D building models with multiple roofs. Most building polygons’ edges meet at right angles (orthogonal polygon). The integrated system partitions orthogonal building polygons into a set of rectangles and places rectangular roofs and box-shaped building bodies on these rectangles. In order to partition an orthogonal polygon, we proposed a useful polygon expression in deciding from which vertex a dividing line is drawn. In this paper, we propose a new scheme for partitioning building polygons and show the process of creating 3D roof models.

关键词： 3D building model 3D urban model automatic generation CG GIs polygon partitioning

Poroelastic solid flow with double point material point method

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Journal of Hydrodynamics 2017年第3期29卷 423-430页

作者： Bruno Zuada Coelho Alexander Rohe kenichi s.ga Department of geo-engineering DeltaresDelftrife-Netherlands Department of Engineering University of CambridgeCambridgeUK

This paper presents the numerical modelling of one and two-dimensional poroelastic solid flows,using the material point method with double point *** double point formulation offers the convenience of allowing for transitions in the flow conditions of the liquid,between free surface flow and groundwater *** numerical model is validated by comparing the solid flow velocity with the analytical *** influence of the Young＇s modulus on the solid flow velocity is discussed for both one and two-dimensional analysis *** effect of the shape of the two-dimensional solid is *** is shown that the solid stiffness has an effect on the poroelastic flow velocity,due to swelling and bending for the one and two-dimensional cases,*** shape is found to be an important factor on the flow velocity of the poroelastic solid.

关键词： Material point method geocontainers double point formulation large deformations