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Search Results: 1 - 10 of 144287 matches for " WANG Tie-feng "
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Multiterminal Conductance and Decoherence Effect of a Three-Terminal Kondo Dot
FANG Tie-Feng,WANG Shun-Jin,
房铁峰
,王顺金

中国物理快报 , 2006,
Abstract: A three-terminal Kondo dot modelled by the Anderson Hamiltonian is investigated. In the strong correlation limit, we calculate the multiterminal conductance and the voltage-induced characteristic splitting of the nonequilibrium Kondo resonance by using the equation of motion approach from viewpoint of the correlation dynamics. A qualitative and reasonable agreement with a recently reported experiment is obtained. We also simulate phenomenologically the decoherence of the Kondo-coherent state formed in the two-terminal setup in the framework of our three-terminal model.
Rapid pyrolysis of coal at high temperature
煤高温快速热解规律研究

LIU Tie-feng,FANG Yi-tian,WANG Yang,
刘铁峰
,房倚天,王洋

燃料化学学报 , 2009,
Abstract: 利用高温滴管炉在1000℃~1400℃考察了彬县烟煤在高温快速热解过程中失重的变化,同时比较了埃塞俄比亚褐煤和晋城无烟煤的热解规律.结果表明,热解失重率随温度的升高而增加,而且各种煤种的最大失重率在高温下大于工业分析的失重率.对于不同变质程度的煤种其热解特性也不相同,较低的热解温度对高阶煤的影响较小.彬县原煤经过热解后比表面积增加,且随着热解温度的提高而增大,当热解温度超过灰熔点时,总比表面积降低.通过数据回归,得到了三种煤的失重率和热解温度的关联式.
Steam gasification kinetics of Binxian chars prepared at different conditions
不同彬县焦的水蒸气气化反应动力学研究

LIU Tie-feng,FANG Yi-tian,WANG Yang,
刘铁峰
,房倚天,王洋

燃料化学学报 , 2009,
Abstract: 在常压,900℃~1050℃考察了彬县煤的三种焦样(常规方法制焦、快速热解焦和脱灰快速热解焦)在热天平上的水蒸气气化反应.考察了温度和焦种对水蒸气气化反应的影响.对比了三种焦的动力学参数和比表面积.结果表明,气化温度是影响煤焦气化反应速率的主要因素,提高50℃,反应速率增加一倍.快速热解焦的反应速率在相同反应条件下明显大于慢速焦.三种焦的表观活化能以快速焦最大,因而反应速率受温度的影响也最大,快速脱灰焦次之,慢速焦最小.
The Local Phase Holdups of Three-phase Loop Reactors
三相环流反应器中的局部相含率

ZHANG Tong-wang,GAO Ji-xian,WANG Tie-feng,WANG Jin-fu,
张同旺
,高继贤,王铁峰,王金福

过程工程学报 , 2005,
Abstract: Better understanding of the hydrodynamic behavior in three-phase airlift loop reactors (TPALRs) is important for their design and scale-up. In the present paper, combination of pressure difference method with gas-liquid inter-phase slip velocity was proposed to measure the phase holdups in TPALRs. The comparison between the measured axial-averaged solid holdups and those calculated from the solid loading shows that the used method is reliable. The gas holdup and solid holdup were experimentally studied with the proposed measuring method. The results show that the gas holdup increases with the increase in the superficial gas velocity, and increases along the axial position. Large particles can break bubbles and increase the gas holdup. The solid holdup decreases with the increase in the superficial gas velocity, and its variation along the axial position is more remarkable than that of the gas holdup. The solid holdup decreases with the increase in the superficial gas velocity. At high superficial gas velocities, the solid holdup has an S-type axial profile.
Effect of Water Vapor Content in Flue Gas on Temperature Swing Adsorptive Flue Gas Desulphurization Process Using Activated Carbon
烟气水蒸汽含量对变温吸附烟气脱硫过程的影响

GAO Ji-xian,WANG Tie-feng,WANG Guang-run,WANG Jin-fu,
高继贤
,王铁峰,王光润,王金福

过程工程学报 , 2009,
Abstract: The effect of water vapor content in flue gas on adsorption of SO2 using ZL50 activated carbon for flue gas desulphurization and denitrification processes by temperature swing adsorption technology was studied by dynamic adsorption experiments.The SO2 adsorption behaviors with water vapor in the flue gas were analyzed.The experimental results were discussed based on mathematical models.The factor of water vapor content was included into the modified Bangham model for predicting the adsorption capacity and a...
Novel system for bridge structure health remote monitoring
一种新型的桥梁结构健康远程监控系统

WANG Zhen-zhi,WANG Xiao-dong,ZHOU Yu,XU Tie-feng,
王真之
,王晓东,周宇,徐铁峰

计算机应用研究 , 2008,
Abstract: 提出了一种新型的桥梁结构健康远程监控系统,能满足恶劣工作环境、抗电磁场干扰、抗腐蚀、抗潮湿等要求,并可通过互联网对大型桥梁结构健康进行可靠的远程监控.系统由布设在结构监控点处进行应变和温度监测的光纤光栅传感器、对传感信号进行解调的光纤光栅解调仪、对传感数据进行采集处理的软件模块和将监控数据通过互联网传输到监控中心的传输模块以及在线远程监控模块等部分组成.
THEORY OF SUPERCONDUCTIVITY IN ALKALI-METAL-DOPED FULLERENES
碱金属掺杂富勒烯超导体的临界温度和约化能隙研究

YAN DA-DONG,WANG ZHI-JIAN,XU TIE-FENG,LI WEN-ZHU,
严大东
,王志坚,徐铁峰,李文铸

物理学报 , 1994,
Abstract: 碱金属掺杂富勒烯与传统的超导体情况不同,它有一个很宽区域的声子谱,其最高频率和最低频率分别与费密能EF和零温超导能隙△0为同一数量级,这必将导致对原来强耦合超导电性理论的修正。本文在此情况下求解Eliashberg方程,得到Tc和△0的表达式。结果表明,分子间的低频振动模和分子上的高频振动模同样参与电声耦合,Tc主要取决于声子谱中高频成份的贡献,而△0的增加主要取决于声子谱中
Gate tunneling current predicting model of strained Si for scaled metal-oxide semiconductor field effect transistor
小尺寸应变Si金属氧化物半导体场效应晶体管栅隧穿电流预测模型

Wu Tie-Feng,Zhang He-Ming,Wang Guan-Yu,Hu Hui-Yong,
吴铁峰
,张鹤鸣,王冠宇,胡辉勇

物理学报 , 2011,
Abstract: For scaled metal-oxide semiconductor field effect transistor (MOSFET) devices, normal operation is seriously affected by the static gate tunneling leakage current due to the ultra-thin gate oxide of MOSFET, and the novel MOSFET devices based on strained Si are similar to bulk Si devices in the effects. To illustrate the impact of gate leakage current on performance of novel strained Si device, a theoretical gate tunneling current predicting model by integral approach following the analysis of quasi-two-dimensional surface potential is presented in this study. On the basis of theoretical model, performance of MOSFET device was quantitatively studied in detail using ISE simulator, including different gate voltages and gate oxide thickness. The experiments show that simulation results agree well with theoretical analysis, and the theory and experimental data will contribute to future VLSI circuit design.
Experimental Study on Non-catalytic Partial Oxidation of Methane to Acetylene and Syngas
甲烷非催化部分氧化制乙炔和合成气过程的实验研究

LI Qing-xun,LIU Ye-fei,WANG Tie-feng,
李庆勋
,刘业飞,王铁峰

过程工程学报 , 2010,
Abstract: 通过探头取样和四极杆质谱在线测量甲烷、氧气和乙炔等组分的浓度分布,考察了氧气/甲烷(甲烷+乙烷/丙烷)摩尔比、气体预热温度及原料气中添加乙烷和丙烷对甲烷非催化部分氧化制乙炔和合成气的影响.结果表明,随轴向距离增加,乙炔浓度先增大后减小,存在最大值;随氧气/甲烷(甲烷+乙烷/丙烷)摩尔比增加,乙炔选择性下降;升高混合气体预热温度产物中乙炔浓度增大,620℃时最大乙炔浓度为4.52%;添加乙烷和丙烷时产物中乙炔浓度基本不变,但甲烷消耗量下降.在实验条件下,生成最大乙炔浓度的激冷位置距烧嘴出口的距离约为80 mm.
Effect of Indole on Hydrodesulfurization Performance of NiMo/γ-Al2O3 Catalyst in a Slurry System
浆态体系中吲哚对NiMo/γ-Al2O3加氢脱硫性能的影响

LI Wei-kun,XIANG Hai-ding,WANG Tie-feng,
李维昆
,项海定,王铁峰

过程工程学报 , 2012,
Abstract: Hydrodesulfurization (HDS) performance of the presulfurized hydrogenation catalyst NiMo/γ-Al2O3 was studied using dibenzothiophene (DBT) as model compound with and without addition of 1000 mg/L indole (based on N) under 300℃ and 4.5 MPa. Sulfur content and species concentration were measured using micro-coulometric analyzer and gas chromatography-mass spectrometry, respectively. The fresh and used catalysts were characterized by BET, XRD, TEM, TPD and TGA. The results showed that the addition of indole slightly increased the reaction rate in the activation period, but significantly decreased the rate in the subsequent stable reaction period, leading to an overall decrease in desulfurization rate from 70% to 58%. The used catalyst did not change in surface topography and crystalline structure compared with the fresh catalyst, but showed an increase in specific surface area. The addition of indole caused 12% decrease in the catalyst pore size and 50% increase in coke formation, and significantly deceased the production of cyclohexyl benzene, indicating that the hydrogenation desulphurization route was suppressed.
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