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Simulation of the continuous casting process in a mold of free-cutting steel 38MnVS based on a MiLE method

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International Journal of Minerals,Metallurgy and Materials 2011年第5期18卷 562-569页

作者： Fu-mingwang Yun-jin Xia jin-long wang Guo-zhong Li School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Key Lab of the Ministry of Education of China for Ecologic and Recycle Metallurgy University of Science and Technology Beijing Beijing 100083 China Jiangyin Xingcheng Iron and Steel Co. Ltd. Jiangyin 214429 China

A new method called mixed Lagrangian and Eulerian （MiLE） method was used to simulate the continuous casting process in a mold of free-cutting steel *** simulation results are basically in agreement with experimental data in the literature,achieving the three-dimensional visualization of temperature distribution,melt flow,shell thickness,and stress distribution of blooms in a *** is shown that the flow velocity of steel melt becomes smaller gradually as the casting *** the flow reaches a certain depth,two types of flow patterns can be observed in the upper zone of the *** first flow pattern is to flow downwards,and the second one is to flow upwards to the *** corner temperature is higher,and the thickness is thinner than those in the *** effective stress in the corner area is much bigger than that in the mid-face,indicating that the corner area is the dangerous zone of cracking.

关键词： free-cutting steel melt flow continuous casting computer simulation

Chain store game based channel allocation in cognitive radio system

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The Journal of China Universities of Posts and Telecommunications 2010年第1期17卷 1-8页

作者： LI jin-long ZHU Ping wang Xu-fa School of Computer Science and Technology University of Science and Technology of China Hefei 230027 China

In adaptive channel allocation for secondary user （SU） of cognitive radio （CR） system, it is necessary to consider allocation process from the temporal perspective. In this article, a chain store game is modeled to achieve SU＇s equilibrium state. Due to the computational complexity of solving equilibrium states, the authors explore the correlated equilibrium （CE） by importing signal mechanisms based on time and sequence number. Also, correlated equilibrium based game algorithms are presented. Simulations show that these algorithms are superior to other allocation algorithms both in channel utilization and communication time.

关键词： CR dynamic specturm allocation chain store game Nash equilibrium (NE) correlated equilibrium (CE)

Numerical simulation of 3D-microstructures in solidification processes based on the CAFE method

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International Journal of Minerals,Metallurgy and Materials 2009年第6期16卷 640-645页

作者： jin-long wang Fu-ming wang Yan-yu Zhao Jiong-ming Zhang Wei Ren School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

It was analyzed that the finite element-cellular automaton （CAFE） method was used to simulate 3D-microstructures in solidification processes. Based on this method, the 3D-microstructure of 9SMn28 free-cutting steel was simulated in solidification processes and the simulation results are consistent with the experimental ones. In addition, the effects of Gaussian distribution parameters were also studied. The simulation results show that the higher the mean undercooling, the larger the columnar dendrite zones, and the larger the maximum nucleation density, the smaller the size of grains. The larger the standard deviation, the less the number of minimum grains is. However, the uniformity degree decreases first, and then increases gradually.

关键词： finite element-cellular automaton model numerical simulation solidification 3D-microstructure Gaussian distribution parameters

Influence of Nitrogen Fertilizer and Endophyte Infection on Ecophysiological Parameters and Mineral Element Content of Perennial Ryegrass

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Journal of Integrative Plant Biology 2009年第1期51卷 75-83页

作者： An-Zhi Ren Yu-Bao Gao Wei wang jin-long wang Nian-Xi Zhao College of Life Science Nankai University Tianjin 300071 China

An experiment was designed to determine the effect of the fungal endophyte Neotyphodium Iolii on the growth, physiological parameters and mineral element content of perennial ryegrass （Lolium perennel L.）, when growing at two N supply levels. Endophyte infection had a significant positive effect on both shoot and root growth of ryegrass, but this difference was only significant in the high N supply treatment. At high N supply, endophyte-infected （El） plants accumulated more soluble sugar in the sheath and the root than endophyte-free （EF） plants. Endophyte infection affected mineral element concentrations in the root more than in the shoot. We found a significant effect of endophyte infection on B, Mn and Mg in the root, but significant effect was only found on B in the shoot. El plants tended to accumulate less B in the shoot at both N levels, but accumulated more B, Mn and Mg in the root at low N levels. The difference of growth parameters in different periods was significant. The content of soluble sugar and crude protein in the sheath were also dependent on the growth stages of both El and EF plants.

关键词： growth Lofiumperenne mineral element Neotyphodiumlolii nitrogen.

Evaluation of the correlation between ammonia nitrogen and p-toluidine using sequencing batch reactor treating synthetic p-toluidine wastewater

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Journal of Environmental Sciences 2006年第2期18卷 259-262页

作者： ZHANG Bo CHEN jin-long wang Fan ZHANG Wei-ming ZHANG Quan-xing Department of Environmental Engineering Nanjing University Nanjing 210093 China

This paper presents lab-scale experiment carried out to evaluate the correlation between ammonia nitrogen （NH3-N） and p-toluidine using sequencing batch reactor treating synthetic p-toluidine wastewater. The profiles of NH3-N and p-toluidine were traced under the concentration of sucrose in the influent varied from 0 to 500 mg/L, aerated airflow varied from 0.6 to 1.2 L/min and temperature varied from 10 to 25℃, respectively. The results showed that the concentration of NH3-N turned from increase to decrease when p-toluidine was nearly completely biodegraded, so the profile of NH3-N could clearly indicate the endpoint of p-toluidine biodegradation. And the profile of NH3-N was not influenced by the sucrose in the influent, aerated airflow and temperature. It is showed that using ammonia nitrogen as monitoring and control parameter is feasible and reliable and has promising application in amine wastewater treatment by SBR.

关键词： sequencing batch reactor correlation ammonia nitrogen p-toluidine biodegradation

Branch Quality Control of Gas-Liquid Two-Phase Flow Using a Novel T-Junction Type Distributor

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Journal of Harbin Institute of Technology(New Series) 2014年第4期21卷 110-115页

作者： Fa-Chun Liang jing Chen jin-long wang Hao Yu College of Pipeline and Civil Engineering China University of Petroleum

In order to eliminate mal-distribution and ensure the side arm to produce desirable gas quality a special distributor is proposed. The experimental distributor mainly consists of a straight through section,a gas extraction line,a liquid extraction line and a side arm branch. A gas orifice and a liquid orifice are mounted at the gas and liquid extraction line respectively to control the outlet gas quality. The diameter of the liquid orifice was set to 2. 50 mm and three gas orifices with different size( dG= 2. 65,5. 00,10. 00 mm) were tested. The experiments were carried out at an air-water two-phase flow loop. The gas superficial velocity ranged from 6. 0 to 20. 0 m /s and the liquid superficial velocity was in the range of 0. 02- 0. 18 m /s. Flow patterns such as wave flow,slug flow and annular flow were observed. The gas quality of the side arm branch was found mainly determined by the flow area ratio of the gas orifice to the liquid orifice and independent of gas and liquid superficial velocity,flow patterns and extraction flux.

关键词： gas-liquid two-phase flow distributor phase splitting flow pattern quality control

Nitride-inclusion characterization in lightweight steel and re-precipitation behavior of AlN during heat treatment:effect of Al content

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Journal of Iron and Steel Research International 2023年第2期30卷 350-362页

作者： jin-long wang Sheng-qiang Song Zheng-liang Xue Dai Tang Gang Tong Dong-ming Liu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina Department of Materials Science&Engineering Center for Iron and Steelmaking ResearchCarnegie Mellon UniversityPittsburghPA15213USA Wuhan Iron and Steel Company Limited Wuhan430081HubeiChina

The composition,morphology,size,and number of inclusions in Fe-22Mn-xAl-0.7C(x=0.5%,5.2%,and 10.5%)lightweight steels after smelting and heat treatment experiments are characterized by scanning electron microscopy and energy-dispersive X-ray spectroscopy from both 2D and 3D *** inclusions are classified into eight categories according to chemistry and *** the steel sample with a low Al content(0.5%),the inclusions are MnS,AlN-MnS,and Al_(2)O_(3)-MnS,among which Al_(2)O_(3)-MnS is the primary *** the increase in Al content in the steel sample(to 5.2%),the populations of AlN and AlN-MnS inclusions of 1-3μm in diameter increase.A further increase in Al content(to 10.5%)leads to a significant decrease in the amount of AlN inclusions of 1-3μm in diameter,and an increase in the amount of AlN-MnS *** precipitation behavior during the phase transformation is also studied by FactSage 8.0 thermodynamic software,and a precipitation mechanism is proposed based on the calculation *** the heat treatment,AlN inclusions re-precipitate out,due to the interactions between Al and dissolved N in the steel ***,AlN inclusions cannot grow large because of unfavorable kinetic *** re-precipitation phenomenon of AlN is predominant under low Al and high N conditions but not at high Al cases.

关键词： Lightweight steel Al content AlN inclusion Heat treatment Re-precipitation behavior

Pixelated prompt gamma imaging detector for online measurement of proton beam: Monte Carlo feasibility study by FLUKA

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Radiation Detection Technology and Methods 2018年第1期2卷 25-31页

作者： jin-long wang LAlberto Cruz Michael Lu School of Astronomy and Space Science Nanjing UniversityNanjingChina NewRT Medical systems Inc.WuxiChina Peak Physics Consulting LLC.GuangzhouChina

Increased accuracy of proton beam delivery provides additional benefits to the patients undergo the treatment.A prompt gamma imaging detector can provide additional information during the treatment,as the prompt gammas produced by the interactions between protons and human tissues are related to the range and profile of the beam in the *** paper makes a Monte Carlo feasibility study for a pixelated prompt gamma imaging detector which can not only measure the proton range but also merge the beam profile and 3D beam image inside the *** simulation result shows that this detector can reduce background noise and measure the range and beam profile by using of grated shielding material,vertical gammas selection and a 5MeV energy window.

关键词： Proton therapy Beam range Prompt gamma FLUKA

Synergistic effect of oxymatrine and angiogenesis inhibitor NM-3 on modulating apoptosis in human gastric cancer cells

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World Journal of Gastroenterology 2007年第12期13卷 1788-1793页

作者： Ming-Quan Song jin-Shui Zhu jin-Lian Chen long wang Wei Da Li Zhu Wei-Ping Zhang Department of Gastroenterology The Sixth Affiliated Hospital of Shanghai Jiaotong University Shanghai 200233 China

AIM: To investigate the synergistic effect of oxymatrine(OM) and angiogenesis inhibitor NM-3 on modulatingapoptosis in human gastric cancer cell lines SGC-7901,MKN-45, MKN-74. METHODS: Human gastric cancer lines SGC-7901,MKN-45, MKN-74 were treated with OM in the absenceand presence of NM-3. The inhibitory rates weredetected by MTT assay. Synergistic effect of OM andNM-3 on the growth of survivin, bcl-2, bax and p53 inSGC-7901 cells were examined by semiquantitative RT-PCR and Western blotting, and their growth inhibitoryeffects were also observed on SGC-7901 tumor xenograftin nude ***: OM combined with NM-3 exhibited asynergistic inhibitory effect on the growth of SGC-7901,MKN-45 and MKN-74 cells in a time-dependent ***-four hours after treatment with OM, NM-3 aloneand their combination, mRNA expression of survivin andbcl-2 in SGC-7901 cells decreased, p53 mRNA expressionincreased. OM (4 g/L) combined with NM-3 significantlyincreased the expression of p53 mRNA and decreasedthe expression of survivin and bcl-2 compared witheither agent alone (193% ± 34% vs 129% ± 12%;44% ± 18% vs 92% ± 18%; 36 ± 17% vs 93% ± 23%,P < 0.05). Western blotting showed that the synergisticeffect of OM and NM-3 on protein translation of survivin,bcl-2 and p 53 was in accordance with their ***, OM/NM-3 combination obviously exhibitedantitumor growth effect in xenografted human gastriccancer cells SGC-7901 compared with either agent ***: OM combined with NM-3 has synergisticinhibitory effects on human gastric cancer cells in vitro and can suppress the growth of xenografted human gastric cancer cells SGC-7901 in vivo.

关键词： NM-3 compound Oxymatrine Gastric cancer Apoptosis