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An analysis of the chaotic motion of particles of different sizes in a gas fluidized bed

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Particuology 2008年第6期6卷 549-556页

作者： Y.Q. Feng A.b. yu Lab for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia

The dynamic behavior of individual particles during the mixing/segregation process of particle mixtures in a gas fluidized bed is analyzed. The analysis is based on the results generated from discrete particle simulation, with the focus on the trajectory of and forces acting on individual particles. Typical particles are selected representing three kinds of particle motion： a flotsam particle which is initially at the bottom part of the bed and finally fluidized at the top part of the bed; a jetsam particle which is initially at the top part of the bed and finally stays in the bottom de-fluidized layer of the bed; and a jetsam particle which is intermittently joining the top fluidized and bottom de-fluidized layers. The results show that the motion of a particle is chaotic at macroscopic or global scale, but can be well explained at a microscopic scale in terms of its interaction forces and contact conditions with other particles, particle-fluid interaction force, and local flow structure. They also highlight the need for establishing a suitable method to link the information generated and modeled at different time and length scales.

关键词： Fluidization Segregation Discrete particle simulation Granular dynamics

Linking discrete particle simulation to continuum process modelling for granular matter: Theory and application

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Particuology 2011年第4期9卷 342-357页

作者： H.P. Zhu Z.Y. Zhou Q.F. Hou A.b. yu School of Engineering University of Western Sydney Locked Bag 1797 Penrith NSW 2751 Australia Laboratory for Simulation and Mo-delling of Particulate Systems School of Materials Science and Engineering The University of New South Wales Sydney NSW 2052 Australia

Two approaches are widely used to describe particle systems： the continuum approach at macroscopic scale and the discrete approach at particle scale. Each has its own advantages and disadvantages in the modelling of particle systems. It is of paramount significance to develop a theory to overcome the disadvantages of the two approaches. Averaging method to link the discrete to continuum approach is a potential technique to develop such a theory. This paper introduces an averaging method, including the theory and its application to the particle flow in a hopper and the particle-fluid flow in an ironmaking blast furnace.

关键词： Particle flow Gas-solid flow Discrete approach Averaging method Hopper flow blast furnace

Antihepatocarcinoma Effect of Solanine and Its Mechanisms

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Chinese Herbal Medicines 2012年第2期4卷 126-135页

作者： yu-bin JI[a][b] Shi-yong GAO[a][b] Center for Life Sciences and Environmental Sciences Harbin University of Commerce Harbin 150076 China MOE Engineering Research Center of Natural Anticancer Drugs Harbin University of Commerce Harbin 150076 China Center for Life Sciences and Environmental Sciences Harbin University of Commerce Harbin 150076 China MOE Engineering Research Center of Natural Anticancer Drugs Harbin University of Commerce Harbin 150076 China

Objective To explore the antitumor effect of solanine and its *** The in vivo antitumor effect of solanine was observed using models developed through in vivo transplantation of tumor cells;In vitro lines of sensitive antitumor cells were selected from the digestive system using MTT assay;The effect of solanine on cell morphology was observed using transmission electronic microscopy;The morphology of apoptotic cells was observed using Annexin V/PI double staining and laser confocal scanning microscopy(LCSM);The rate of cell apoptosis was measured using Annexin V/PI double staining and flow cytometry;The concentration of intracellular Ca 2+ ([Ca 2+ ]i)was determined using Fluo-3/AM staining and LCSM;The membrane potential of cellular mitochondria was determined using TMRE staining and LCSM;The protein expression of bcl-2 and bax was measured using immunological marking and LCSM;And the activity of caspase-3 was measured using the colorimetric *** Solanine could inhibit the growth of tumor weight in S180 tumor-bearing mice and prolong the survival time of H22 tumor-bearing *** assay revealed that HepG2 cells were quite sensitive to solanine because solanine could induce morphological changes in HepG2 cells,with the rate of early apoptosis being 4%,8.5%,and 20.1%,for HepG2 cells treated for 24 h with solanine at concentration of 0.4,2,and 10μg/mL, *** could raise the[Ca 2+ ]i and lower the membrane *** could reduce the protein expression of bcl-2 while increase that of bax,thus increasing the activity of *** The obvious antitumor activity of solanine in human hepatocarcinoma is *** inhibitory effect is achieved through solanine decreasing the bcl-2/bax ratio,thus increasing[Ca 2+ ]i,which could enhance the enzymatic activity of the caspase family,thus inducing the apoptosis of HepG2 cells.

关键词： apoptosis caspase hepatocarcinoma S180 solanine

Conformational Analysis of Two Diosgenyl Saponins

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Chinese Chemical Letters 1997年第9期8卷 785-788页

作者： Liu, MZ Li, C yu, b Cheng, Mb Feng, CL Hui, YZ CHINESE ACAD SCI SHANGHAI INST ORGAN CHEMSTATE KEY LAB BIOORGAN & NAT PROD CHEMSHANGHAI 200032PEOPLES R CHINA

Diosgenyl alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->6)-beta-D-glucopyranoside (1) and Diosgenyl alpha-L-rhamnopyranosyl-(1-->2)-beta-D-xylopyranoside (2) were shown to be fascinating ''facial amphiphi... 详细信息

关键词： Chen MD Conformational Analysis of Two Diosgenyl Saponins

Effect of base Material on Microstructure and Texture Evolution of a Ti–6Al–4V Electron-beam Welded Joint

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Acta Metallurgica Sinica(English Letters) 2017年第5期30卷 499-504页

作者： G.Q.Wang Z.b.Zhao b.b.yu J.R.Liu Q.J.Wang J.H.Zhang R.Yang J.W.Li School of Materials Science and Engineering University of Science and Technology of China Institute of Metal Research Chinese Academy of Sciences Science and Technology on Power beam Processes Laboratory Beijing Aeronautical Manufacturing Technology Research Institute

The effect of base material（bM） on microstructure and crystallographic orientation evolution of a Ti–6Al–4V electron-beam welded joint was investigated. Meanwhile, the crystallographic orientation of prior b grains was studied by advanced electron backscattered diffraction data processing. The inhomogeneity of microstructure within welded joint was formed due to the different microstructures of bM. by comparing microstructure details of the welded joint, including microstructure morphology and crystallographic orientation with those of the base material, it can be found that both the microstructure morphology and crystallographic orientation of the EbW joint would be controlled by bM.

关键词： Electron-beam welding Titanium alloys Prior b orientation Microstructure Texture

ANALYSIS OF TEMPERATURE DEPENDENCE OF PHASES AND SURFACE MORPHOLOGY OF bi_2Sr_2Ca_(x-1)Cu_xO_y THIN FILMS USING REACTIVE CO-DEPOSITION METHOD

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Acta Metallurgica Sinica(English Letters) 2007年第3期20卷 199-204页

作者： Z.H. Zou X.M. yu b.S. Zhang Y. Qi School of Science Northeastern University Shenyang 110004 China

A reactive co-deposition processing for obtaining high-quality single-phase bi2Sr2Cax-1CuxOy （bi2212） thin films has been investigated using molecular beam epitaxy （MbE） with 2.7 ×10^-3pa ozone gas introduction for oxidation. The thin films with a constant composition of almost 2 ： 2 ： 1 ： 2 were designed to be fabricated at the substrate temperature between 675 and 780℃, the substrate temperature dependence of the surface morphology and the emergence phases were investigated in detail. A noticeable result is that the distribution of Cu element in the thin films is sensitively changed with the substrate temperature. At 750℃ it is inclined to locate in the periphery of each grain through the diffusion process. At 780℃ the Cu-compositional fluctuation brought around the dendritic crystal growth in the thin films. below 705℃, the bi2212 single-phase cannot be achieved in the thin films.

关键词： bi2212 (bi2Sr2Cax-1CuxOy) single-phase dendritic growth substrate temperature

A new series of emodin derivatives with bone affinity

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Chinese Chemical Letters 2007年第2期18卷 141-144页

作者： Hong Chen[a]Email:chenhongtian06@*** Ying Wang[a][b] Ling Leng[a] Mao Sheng Cheng[b] Peng Fei yu[b] Jing Ze Zhang[a] [a]Medical College of Chinese People‘s Armed Police Forces Tianjin 300162 China [b]Shenyang Pharmaceutical University Shenyang 110016 China

A new series of bone affinity compounds were synthesized by linking emodin with 5-fluorouracil derivatives. Their bone affinities were established by hydroxyapative (HA) affinity experiment in vitro, and their cytosta... 详细信息

关键词： Emodin 5-Fluorouracil bone affinity Antitumor

To the Question of the Independence of the Surface Electromagnetic Wave Frequency

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Journal of Environmental & Earth Sciences 2019年第1期1卷 29-32页

作者： V.K.balkhanov yu.b.bashkuev Institute of Physical Materials Science of the Siberian branch of the Russian Academy of Sciences Ulan-Ude CityRussia

Earth's the surface is often strongly inductive,consisting of a dielectric layer thickness endpoint lying on an unlimited conductor ***-magnetic wave,spreading along the surface,it appears captured dielectric layer,spreading it as in the waveguide *** theory it is known that the spread in the waveguide can only electromagnetic waves with a discrete set of *** experience shows that the captured waveguide channel electromagnetic waves can be any *** article found that this behavior is due to the fact that electromagnetic waves in free space border-dielectric layer damped height in several *** the thickness of the dielectric layer becomes more effectively,and this leads to a reduction of the minimum frequency of the waveguide.A discrete set of frequencies is blurred so that cover each ***,a discrete set of frequencies becomes solid,and captured waveguide channel electromagnetic waves are independent of frequency.

关键词： Impedance Waveguide channel Continuous transmission of electromagnetic waves Strongly inductive media

Simulation aided hot zone design for faster growth of CZ silicon mono crystals

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Rare Metals 2011年第2期30卷 155-159页

作者： CAO Jianwei GAO yu CHEN Ying ZHANG Guohu QIU Minxiu The State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China GRINM Semiconductor Materials Co. Ltd Beijing 100088 China

Computer simulation was used for optimizing a hot zone for Czochralski （CZ） silicon crystal growth. The heater structure and heat shield material were investigated. With this optimized hot zone, the temperature gradient near the crystal/melt interface increased and the CZ crystal could be grown at a faster rate. It is a great contribution for saving power consumption.

关键词： crystal growth silicon computer simulation temperature gradient