Lateral Bearing Capacity and Simplified Equations of Dry Stack In filled Reinforcement Concrete Frame Structure

The mechanism and lateral bearing capacity of reinforcement concrete (RC) frame with dry stack in filled panel (DSIP) were investigated using quasi static experiments and finite element models. According to the parallel model and equivalent strut model, the lateral bearing capacity of RC frame and DSIP were researched separately. Results show that: 1) The plain stress element and interface element are applicable in finite element (FE) model analysis. According to the FE model, the failure of RC frame with DSIP is caused by the damage of frame; 2) Lateral bearing capacity of DSIP is mainly from the friction between bricks in the panel, which can be divided into 3 stages: constant stage, increasing stage and ultimate stage; 3) Equations for lateral bearing capacity of DSIP were proposed and verified by FE model results.     

A new family of zero current and zero voltage switching pulse width modulation converters

A new family of zero current and zero voltage switching (ZC ZVS) pulse width modulation (PWM) converters was proposed, based on a new ZC ZVS PWM switch cell. The main switches operate at ZCS on and off, the auxiliary switches operate at ZVS on and off, and the passive semi conductor devices in the ZC ZVS converters operate at ZCS on and off. In addition to operating at constant frequency and reducing commutation losses, the new converters have no additional current stress or conduct loss in the main switch in comparison to hard switching converters. The principle of the new ZC ZVS PWM Boost converter was analyzed. The simulation results of the ZC ZVS PWM converter are provided to verify the performance of the new ZC ZVS PWM converters.     

不同矮化中间砧红富士苹果越冬期间枝条内水份变化与抽条？…

研究结果表明：越冬期间枝条内总含水量的变化呈下降－上升趋势,易抽条的砧穗组合枝条内总含水量下降幅度大,回升时间晚,变异系数大;束缚水含量变化呈上升－趋势,易抽条的砧穗组合枝条内下降幅度大,变异系数高,束缚水与自由水的比值低。离体条件下枝条失水速率、失水率与抽条无相关性。最后提出了评价不同矮化中间砧越冬能力的水份指标。     

The Calculation of Electromagnetic Fields in Sapce Around Lightning Path

This thesis studies mathematical model for calculating electromagnetic fields in space around lightning path.The calculating method which can more exactly calculate the distribution of electrocmagnetic fields in space around lightning path is developed.The results are consistent with results of refereces and simulating test.It supplies references for interference protection desigh of electronics such as computers ect.     

香子兰精油的超临界CO2萃取及GC／MS分析

采用超临界ＣＯ２流体萃取和气相色谱－质谱联用技术,分析了该方法所得香子兰精油的化学组成,在其精油的４４个色谱峰中鉴定出１１种主要化学成分,占该精油总量的８０．１％,其中最高的香草醛为６４．８３％。     

Study on Loading Ability of Straw Bale

The loading ability of straw bale was tested by Electronical Testing Machine. The linear regression equations were proposed between failure density and loading ability, and failure density and compressing energy. Based on an exponent model, the testing coefficients of straw bale were estimated using Levenberg-Marquardt Method. The results of test showed that the relation between failure density and loading ability and compressing energy was linear in the phase of high density. The loading ability of straw bale could meet the building bill.     

Design and development of propulsion system for CNG-electric hybrid city-bus

The design of propulsion system for CNG-electric hybrid city-bus is introduced based on the selection of driving cycle and the establishment of control strategy. Making program of powertrain’s configuration is included as well as parameters’ selection and matching of components such as engine, motor, battery and transmission. The simulation results show that the design meets the requirements. The components of the propulsion system are integrated together, and then they are installed into the sample city-bus. The roadway test has been done under the target driving cycle. Compared with the peer CNG city-bus, there are 28% increasing in the largest climb degree and the acceleration time of 0~50 km is reduced more than 1.8 s, and the fuel saving rate achieves to 22% under the typical city-bus driving cycle of China.