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Rare Earth Superfine Powders Fabrication and Characterization by Novel Non-Ball Miller

Rare Earth Superfine Powders Fabrication and Characterizatio...

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中国颗粒学会第六届学术年会暨海峡两岸颗粒技术研讨会

作者： Kun Shan LI~(1,2),Yi Min MO~2 (1.School of Mechanical Engineering,University of Jinan,Jinan,Shandong 250022,China 2.School of Mechanical Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China)

The non-ball mill is a new-type grinding equipment that is developed on the foundation of the successful technology of vertical shaft breaker,vertical mill,roller etc.,its principle is to make the movement route of attacking the supply in the machine to be redesigned,the grain reaches to break once only through constantly accumulating energy in the grain,the crushing ratio is big,especially this machine adopt the advanced technology,the vulnerable part is made of metal and nonmetal,which make the life-span lengthens ten times than the alloy hammer's,which is invention in the *** average size of this machine is smaller than 1 mm,it is not only suitable for soft quality supplies but also further more superior for hard quality supplies performance.

关键词： rare earth superfine powders non-ball miller energy accumulation

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Preparation of CuO Modified SBA-15 and Applications as Catalyst in AP/HTPB Solid State Propellants

Preparation of CuO Modified SBA-15 and Applications as Catal...

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中国颗粒学会第六届学术年会暨海峡两岸颗粒技术研讨会

作者： Fu Tingming~(1,2),Chen Weifan~2,Gu Zhiming~1,Yang Yi~1,Li Fengsheng~1 (1.National Special Superfine Powder Engineering Research Center,College of Chemistry and Chemical Engineering.Nanjing University of Science and Technology,Nanjing,Jiangsu 210094,China 2.1nstitute of traditional Chinese medicine,Nanjing university of Chinese medicine,Nanjing,Jiangsu 210029,China 3.School of Materials Science and Engineering,Nanchang University,Nanchang,Jiangxi 330031,China)

CuO/SBA-15 composites were prepared by using impregnation method with as-prepared SBA-15 as support,and the occluded template(P123) in SBA-15 promoted the dispersion of CuO on *** the catalyst of propellant,CuO/SBA-15 composite not only enhanced the burning rate of propellant but also decreased the pressure *** addition of 1 wt%CuO/SBA-15 in the propellant, the burning rate of AP based propellant increased 9.5%and pressure exponent decreased 17.3%.

关键词： SBA-15 CuO template concluded impregnation propellant

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A Fluctuating Lattice-Boltzmann Model for Direct Numerical Simulation of Particle's Brownian Motion

A Fluctuating Lattice-Boltzmann Model for Direct Numerical S...

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中国颗粒学会第六届学术年会暨海峡两岸颗粒技术研讨会

作者： Nie Deming~(1,2),Lin Jianzhong~(1,2) (1.State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University,Hangzhou,Zhejiang 310027,China 2.China Jiliang University,Hangzhou,Zhejiang 310018,China)

A single-relaxation-time fluctuating lattice-Boltzmann(LB) model for direct numerical simulation(DNS) of particle's Brownian motion is established by adding a fluctuating component to the lattice-Boltzmann equations(LBEs).The fluctuating term is proved to be the random stress tensor in fluctuating hydrodynamics by recovering Navier-Stokes equations from LBEs through a Chapman-Enskog expansion.A three-dimensional implementation of the model is also presented,along with simulations of a single spherical particle and 125 spherical particles at short *** results including the mean-square displacement,velocity autocorrelation function and self-diffusion coefficient of particles compare favorably with theoretical results and previous numerical results.

关键词： fluctuating hydrodynamics lattice-Boltzmann method Brownian motion direct numerical simulation

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A Modeling Study On Heterogeneous Chemical Processes On Aerosol Surface

A Modeling Study On Heterogeneous Chemical Processes On Aero...

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中国颗粒学会第六届学术年会暨海峡两岸颗粒技术研讨会

作者： Junjun Deng,Tijian Wang,Li Liu (Department of Atmospheric Science,Nanjing University,Nanjing 210093,China)

To explore the possible impacts of heterogeneous chemical processes on atmospheric trace components,a coupled box model including gas-phase chemical processes,aerosols thermodynamic equilibrium processes,and heterogeneous chemical processes on the surface of dust,BC and seasalt is set up to simulate the effects of heterogeneous chemistry on the aerosol surface,and analyse the primary factors affecting heterogeneous chemical *** indicate that heterogeneous chemical processes on the aerosol surface in the atmosphere will affect the concentrations of trace gases like HO,HO,O,NO,NO,HNO and SO,and aerosols like SO,NO and *** tests suggest that the magnitude of the impacts of heterogeneous chemical processes strongly depend on the aerosol concentration and the surface uptake coefficients used in the box ***,the impact of temperature on heterogeneous chemical processes is considerable *** is worth mentioning that how the surface heterogeneous reaction of HNO occurres will affect the components of the troposphere.

关键词： box model dust BC seasalt heterogeneous chemistry

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Effect of Parameters on Synthesis of Silica Aerogels

Effect of Parameters on Synthesis of Silica Aerogels

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中国颗粒学会第六届学术年会暨海峡两岸颗粒技术研讨会

作者： Hui Wang~1,Jianxin Cao~2,Lingke Zeng~1 (1.College of Materials Science & Engineering,South China University of Technology,Guangzhou,Guangdong 510640,China 2.College of Chemical Engineering,Guizhou University,Guiyang,Guizhou 550003,China)

Silica aerogels were synthesized by the sol-gel polymerization of tetraethylorthosilicate（TEOS） followed by supercritical drying（SD） at 300℃and *** influences of water/TEOS,ethanol/TEOS,activator dosage and pH value on the gelation time and the pore structure of SiO aerogel during the process were *** results show that the gelatinizing time became longer at higher water/ethanol content,at first it was decreased with pH value and HF content increased and then it was *** porous structure was measured by nitrogen adsorption *** content of HO had a dominant effect on the pore size distributions and the pore *** pore diameter become greater and the pore size distribution appeared widen when pH value *** with the content of HF increasing the pore diameter become smaller and the pore size distribution narrow at first,and then the pore diameter become greater and the pore size distribution widened.

关键词： Silica aerogels synthesis parameters porous structure

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TEMOM Method for Nanoparticle Brownian Coagulation in the Entire Size Regime

TEMOM Method for Nanoparticle Brownian Coagulation in the En...

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中国颗粒学会第六届学术年会暨海峡两岸颗粒技术研讨会

作者： Mingzhou Yu~(1,2),Jianzhong Lin~(1,2) (1.State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University,Hangzhou,Zhejiang 310027,China 2.China Jiliang University,Hangzhou,Zhejiang 310018,China)

Through applying the Taylor-expansion technique to the particle general dynamic equation,the newly proposed moment method(TEMOM) is extended to solve Brownian coagulation in the entire size *** make a fair comparison between this new method and other known methods in efficiency and accuracy in the full regime,the same Dahneke's coagulation kernel is used in all the *** a comparison,the Harmonic coagulation kernel is also applied in this new model and the Pratsinis's moment model(PMM). Furthermore,the results produced by the quadrature method of moments(QMOM3) and the sectional method(SM) using Dahneke's coagulation kernel are also presented,and the SM is used here as the reference *** to other models,the TEMOM using Dahneke's kernel is considered to give the most accurate results with a high efficiency,and it is proposed to be used in the following studies for nanopraticle evolution due to Brownian *** on the analysis for self-preserving process,the index for geometric mean deviation used in the PMM is proved to be also valid in the TEMOM model and the QMOM model.

关键词： Particle general dynamic equation Brownian coagulation Moment method Taylor-series expansion entire regime

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Experimental Study On The Distribution Of Particles Concentration Of Gas-Solid Fluidized Bed With Disparately Sized Binary Particles

Experimental Study On The Distribution Of Particles Concentr...

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中国颗粒学会第六届学术年会暨海峡两岸颗粒技术研讨会

作者： Jiantao Cao~(1,2),Zhonghu Cheng~1,Yitian Fang~1,Yang Wang~1 (1.Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan,Shanxi 030001,China 2.Graduate University of the Chinese Academy of Sciences,Beijing 100039,China)

Experiments were carried out to study the concentration distribution of disparately sized binary particle in the jet region of a 1-m dia & 8-m high semicircular jetting fluidized bed with a conical *** particles concentration was measured by the optical fiber probe system and *** fine particles were injected coaxially to simulate fines recycled into the jet high temperature region in an actual operating unit with different fine particles feed-in *** was found that the coarse particles concentration increases when the jet gas-velocity reaches to the certain *** distributor gas-velocity increasing results in the increasing of the time-averaged particles volume concentration in the jet *** annular gas-velocity increase causes the particles concentration to *** there is high fine concentration existing in the jet region of large jetting fluidized *** fine particles concentration in the jet region increases with the increasing of fine particles feed-in quantity,and the fine concentration increased toward the bed surface. When reaching to a certain bed height,the fine concentration begins to decrease.

关键词： Fluidized bed Particle concentration Binary particles Distinct size difference Jet

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Preliminary Study of Urban Expansion on SOA Formation in Springtime over the Pearl River Delta Region with WRF/CHEM Model

Preliminary Study of Urban Expansion on SOA Formation in Spr...

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中国颗粒学会第六届学术年会暨海峡两岸颗粒技术研讨会

作者： Mukul Teriwa National Center for Atmospheric Research BoulderCOUSA

＜正＞The Pearl River Delta（PRD） region has experienced remarkable economic development and urbanization in the past two *** pollution became more serious in the last five years and becomes a very-concerned regional air pollution *** this paper,the online Weather Research and Forecasting and chemistry（WRF/CHEM） model,coupled with urban canopy（UCM） and biogenic-emission models,is used to explore impacts of urban expansion on secondary organic aerosols *** scenarios of urban maps are used in WRF/CHEM to represent early 1990s（pre-urbanization） and current urban distribution in the ***-long simulation results using the above land-use scenarios for March 2001 show The relative variation of SOA from anthropogenic VOC emissions have two increased centers which locate in Zhongshan and northern Guangzhou,about 10-15%increase for Aitken mode and 9%for Accumulate *** and northern Hong Kong are the centers for decrease,around 15%decrease for Aitken mode and 6%for Accumulate *** influences of urbanization on SOA formation due to different precursors are *** variations of Alkanes and Aromatics on SOA formation are increase,around 8%and 14%respectively,while the variation of Alkenes on SOA formation is decrease about 8%.

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Experimental Study on Gas-solid Flow in the Standpipe of the CFB Combined with a Coal Pyrolysis Reactor

Experimental Study on Gas-solid Flow in the Standpipe of the...

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中国颗粒学会第六届学术年会暨海峡两岸颗粒技术研讨会

作者： Zhifeng WANG~(1,2),Peng LIANG~(1,3),Jicheng BI~1 (1.State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences, Taiyuan,Shanxi 030001,China 2.Ningbo Branch of Academy of Ordnance Science,Ningbo,Zhejiang 315103,China 3.College of Chemical and Environmental Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266510, China)

The experiment was conducted to study the pressure profiles and gas-solid flow in the standpipe of a new cold model of circulating fluidized bed reactor combined with a coal pyrolysis *** effects of superficial gas velocity in the riser U,circulating rate G and aeration added to the pyrolysis chamber Q on the axial pressure profiles in the standpipe were *** U increasing the negative pressure gradient in standpipe decreased *** G increasing the negative pressure gradient and slip velocity in the standpipe were also *** of aeration added to the pyrolysis chamber on gas/solid flow state in the standpipe was *** U and orifice of the valve at the bottom of the standpipe kept constant,pressure distribution trend especially at the top of the standpipe would become larger with Q *** flow pattern in the standpipe changing from negative pressure difference to positive pressure difference occurred with U increasing when Q and the orifice of the valve at the bottom of the standpipe were *** the modified Ergun equation was suitable for describing the moving bed flow in the standpipe of the system.

关键词： CFB Pyrolysis reactor Standpipe Pressure profile Slip velocity

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Artificial Neural Network Approach for Modeling of Conversion Rate of Refractory Gold Concentrate Oxidation by Nitric Acid

Artificial Neural Network Approach for Modeling of Conversio...

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中国颗粒学会第六届学术年会暨海峡两岸颗粒技术研讨会

作者： Guolong Gao,Dengxin Li,Zuxi Yan,Lina Sun (College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China)

Considering that the pretreatment of refractory gold concentrate is a complex and nonlinear process,it is necessary to develop a new route for optimum control and *** this study,artificial neural network(ANN) was *** size(50-335μm), reaction temperature(25-85℃),nitric acid concentration(10-30%,wt.),stirring speed(400 - 800 rpm) and reaction time(10-90 min) were chose as input variables,while conversion rate was chose as output *** tansig function was used as the transfer function in the only hidden layer with 11 neurons and logsig transfer function at output layer.A feed forward neural network model with back propagation algorithm was developed to predict the conversion rate of refractory gold concentrate based on 125 experimental sets obtained in a laboratory batch *** mean squared error(MSE) become stable at 0.000998771 when the numbers of epochs reach *** model was evaluated by comparing the simulated results with the experimental values and was found to be in good agreement with a correlation coefficient of 0.99.

关键词： Artificial Neural Network Approach for Modeling of Conversion Rate of Refractory Gold Concentrate Oxidation by Nitric Acid

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