GONG Guang-cai , ZENG Wei , CHANG Shi-jun College of Civil Engineering , Hunan Univ , Changsha , China , China th Design & Research Institute of information , electronic techinology , Chengdu , China
Abstract:An exergy analysis model of air-conditioning heating and cooling systems was established based on exergy method and thermoeconomic theory. Product exergy cost was proved to be the key factor in evaluating air-conditioning heating and cooling systems. The
FANG Zhi , WEN Qing-jie , TAN Dong-Han College of Civil Engineering , Hunan Univ , Changsha , China , Department of Bridge Engineering , Tongji Univ , Shanghai , China
Abstract:对钢筋混凝土圆管涵在填土荷载和车辆荷载作用下的管周土压力进行了现场试验研究,并对管-土共同作用体系进行了弹性有限元分析.在此基础上采用面积等效法提出了钢筋混凝土圆管涵在填土荷载和车辆活栽作用下的土压力计算公式,并与现场试验值及各规范的计算值进行了比较.结果表明:本文计算公式得到的结果与试验值吻合较好.随管顶填土高度hs的增加,管周的竖向土压力系数Ks可取值1.5(hs<1 m)-1.35(hs>10 m)、侧向土压力系数λ可取值0.L(hs<1 m)-0.25(hs>3 m),其中间值可采用线性内插;车辆荷载产生的土压力可按23°扩散角进行计算.
CHEN Zheng-qing , LI Ling-yao , LI Yu
Abstract:To choose the steel tube number and the disposition form of long span Concrete-Filled steel Tube(CFST) arch bridges, two CFST arch bridges with a span of 400 m, a width of 27.5 m(one was four-tube arch rib and the other was six-tube arch rib), and the sam
ZHU Zhi-wen CHEN Zheng-qing , GU ming
Abstract:A numerical simulation model based on Computational Fluid Dynamics(CFD) was presented to evaluate the flutter derivatives of streamlined section. This numerical model, derived from viscid incompressible Navier-Stokes equations and finite volume method, ai
GONG Guang-cai , ZENG Wei , CHANG Shi-jun (. College of Civil Engineering , Hunan Univ , Changsha , China; . China llth Design
Abstract:An exergy analysis model of air-conditioning heating and cooling systems was established based on exergy method and thermoeconomic theory. Product exergy cost was proved to be the key factor in evaluating air-conditioning heating and cooling systems. The
ZHAO Fu-yun , TANG Guang-fa , LIU Di
Abstract:After analyzing the characteristics of different low-order and high-order schemes, it was pointed out that the schemes of second-order numerical accuracy were the optimum way in numerical simulation. Taking, the general two-dimensional steady convection-d
Abstract:The buckling analysis of cylindrical shell with throughout circumference delamination was investigated. Based on Donnell thin shell theory and the adjacent equilibrium criterion of initial postbuckling theory, the basic buckling equations for composite la
YANG Ji-kuang , FANG Hai-feng ( . Key Laboratory of Advaneed Teehnology for Vehiele Body Design
Abstract:A finite element (FE) model of lower extremity was developed to investigate the biomechanical responses and injury mechanisms of the lower extremity to a lateral bumper impact in car-pedestrian accidents. The model consisted of the pelvis, the femur, the
ZENG Jian-ping , TIAN Tao , LIU Li-hui , YAN Min Department of Applied Physics , Hunan Univ , Changsha , Hunan , China
Abstract:基于Ahujia基准电压发生器设计了低功耗、高电源抑制比CMOS基准电压发生器电路.其设计特点是采用了共源共栅电流镜,运放的输出作为驱动的同时还作为自身的偏置电路;其次是采用了带隙温度补偿技术.使用CSMC标准0.6μm双层多晶硅n-well CMOS工艺混频信号模型,利用Cadence的Spectre工具对其仿真,结果显示,当温度和电源电压变化范围为-50-150℃和4.5-5.5 V时,输出基准电压变化小于1.6 mV(6.2×10-6/℃)和0.13 mV;低频电源抑制比达到75 dB.电路在5 V电源电压下工作电流小于10 μA.该电路适用于对功耗要求低、稳定度要求高的集成温度传感器电路中.
JIANG Tie-zheng , CHEN Chen , CAO Guo-yun
Abstract:The main objectives of this paper are to improve power system damping and to maintain voltage at the Static Var Compensator (SVC) location bus simultaneously.A new controller for SVC with closed-form analytic solution nonlinear optimal predictive control
E Jia-qiang , GONG Jin-ke , WANG Yao-nan , YUAN Wen-hua , LIU Jin-wu
Abstract:In view of the fuzzy characteristic of the knowledge representation of the fault diagnosis expert systems for the diesel engine in special type vehicles, the fuzzy diagnosis models of fault type were established, and an uncertainty reasoning method and fu
YAN Min , PENG Chu-wu , LI Fu-hai , ZENG Jian-ping , ZHAO Feng Department of Applied Physics , Hunan Univ , Changsha , China , College of Electrical , Information Engineering , Hunan Univ , Changsha , China
Abstract:从教学实际需要出发,在分析影响四探针电阻率测试仪精度的几个主要因素的基础上,应用微电子技术与嵌入式系统,研制出了智能四探针电阻率测试仪。实际工作表明:该仪器具有自动切换量程、稳定性好的特点;具有PC机接口;功耗小于6 W;误差为±0.5%;测量范围:0.025-2 500 Ω·cm;自动显示小数点和单位.
LI De-gang , YU De-jie , LIU Jian , GUO Jian-wen
Abstract:In view of the shortcomings of the present research of equipment collaborative fault diagnosis in the generality of tool supporting and the interactivity of diagnosis information, the analysis and modeling of the collaborative diagnosis system was standar
DENG Yuan-wang , WANG Yao-nan , CHEN Jie-ping
Abstract:Simulating models of engine performance were established using the neural network toolbox of MATLAT. Based on the results, the universal characteristics of internal combustion engine(ICE) were obtained and analyzed, and the optimal operation area of the e
HU Qin-chun , HE Yi-gang , LI Hong-min , ZHU Yan-qing
Abstract:This paper proposed a method for the implementation of continuous wavelet-transform (CWT) using switched-current (SI) technology, based on current mode and a substitute of switched-capacitor. The scheme of complex demodulation,using parallel architecture,
LIU Yang , CHEN Chuan-bo , WANG Guo-xia , LU Qi
Abstract:Based on fuzzy theory,the major social and economic factors influencing electric power consumption were analyzed, and a GM(1,1) model was designed to forecast the electric power consumption from 2003 to 2015 in Hunan Province. The results showed that Huna
WANG Ke-min , ZHENG Ming-bin , WU Ping , HE Xiao-xiao , LIN Xia , GONG Ping , CHEN Xiao-hong
Abstract:Maca nano-pharmaceutics was prepared by the rotary-film evaporation method with soya lecithin as the carrier and glucose solution as the dispersion medium. The particle size and Zeta potential of the maca nano-pharmaceutics with different maca/liposome we
Abstract:Temperature profile and shear rate were used to optimize the processing conditions to develop laminar morphology in blow molding high density polyethylene(HDPE)/polyamide(PA6) blends. The result showed that it was good to form laminar morphology of disper
XU Xin-hua , ZHANG Qin-li , LI Xiao-wu HE Gan-wu , ZHANG Qiu-lin , LI Yan-jie
Abstract:氢氧化钾存在下，异丙醇／水作溶剂，室温下硫酚对替加氟的环甘油硫代磷脂缀合物发生亲核开环，高产率的得到新型的甘油骨架上含硫的替加氟硫代磷脂缀合物，经抗肿瘤活性测定，目标化合物具有良好的对人体膀胱癌细胞T-24和胃癌细胞BGC-823抑制作用．
LI Zhong-ying , LI Zhi-wei , LIU Wei-dong , WANG Xiao-guang ( . College of Chemistry , Chemical Engineering , Hunan Univ , Changsha , China . Hunan Research Institute of Chemical Industry , National Pesticide R
Abstract:Ten new Methyl N-methoxy-N-(2-(methyl(substituted-phenylimino)methylthiomethyl) phenyl) carbamates were synthesized according to bioisoster principle. All compounds were confirmed with IR,1H NMR and LC/MS, Some compounds showed fungicidal activities again
QU Shu , PENG Jing-cui , ZHANG Gao-ming , ZHAO Chu-jun , LI Hong-jian
Abstract:Based on some reasonable approximations, a simple analytic model for the total cell current in bilayer organic light-emitting devices (OLEDs) with Ohmic contacts was presented. This model permitted the semiquantitative analyses of the influence of the mos
SONG Xiao-lan , QIU Guan-zhou , SHI Xun-da , WANG Hai-bo , QU Peng School of Resources Processing , Bioengineering , Central South University , Changsha , Hunan , China; . Silicon Wafer Manufature Department , Grinm Semiconductor Materials , Ltd , Beijing
Abstract:The synergistic effect of the mixture of CTAB cationic (or SDBS anionic) and Tween 80 nonionic surfactants on dispersion stability of CeO2 nanoparticles in water solutions was studied by the Zeta potential, adsorption isotherm and settling experiment. The
ZHANG Guo-chun , AI Cui-ling , WANG Shu-min
Abstract:The chromium in industrial wastewater could be removed with the scrap-iron fixed bed reactor. The metal was removed through electrochemical reaction, with scrap-iron electric enrichment for flocculate, catalyst function and coagulation of cell reacting pr
Abstract:Based on the theory of composting kinetics, this paper analyzed the key controlling factors involved in the composting process, including temperature, moisture content and oxygen concentration, and established a kinetic model. The model was used to predic
Abstract:An automatic video object segmentation algorithm based on spatio-temporal informtion was proposed. Temporal segmentation was based on change detection, whose key factor was the selection of appropriate threshold by histogram analysis. For spatial segmenta
LI Rui , LI Hang , YANG Jin-ming , GUO Wei-feng
Abstract:An implementation method of OLAP based on XML, called X-OLAP, was proposed, XML' s structure was applied to express the aggregation relationship between tuples in data cubes. Without new elements added, the method can also represent all the summary data a
TANG Can-qin , LI Qing-guo ; MA Bo-lin
Abstract:Let G be a locally compact Vilenkin group, and we extended the case of standard fractional integral operators on the Vilenkin group G. A 9-type of fractional integral operators was introduced, and its properties were given. We proved that this kind of ope
Abstract:With monthly data series of the import and export trade of China, this study applied R/S analysis method for the first time to analyze the trade markets. Hurst exponents of the time series were calculated, which indicated the existence of long-memory of t
