Abstract:This paper studied the dynamic response of the structure-box foundation-soil system through test and Finite Element(FE) analysis of 1/2 large scale model.By comparing the basic frequencies of test and FE analysis,it was found that the test results were sm

Abstract:基于H2和H∞性能对粘弹性阻尼器消能结构中阻尼器进行布置,具有一定的优化效果;而针对只有一个薄弱层或某一薄弱层突出的结构,将该层控制输出作为唯一的控制输出,消能减震效果将明显改观.利用Matlab中LMI工具箱和优化工具箱可以方便地确定阻尼器在结构中的优化位置及相应的数量.通过结构响应计算可以合理地选择所需阻尼器的数量.选用一栋10层混凝土框架结构对优化方法进行了验证,非线性时程分析结果表明了其优越性.

Abstract:Wind tunnel tests were performed on a rigid model of a cantilevered roof with different angles.With an aspect ratio of 1:50,the model was equipped with 128 pairs of pressure taps covering both roof surfaces.With an electronic pressure scanning system,wind

Abstract:By using a friction-contacting interface element which can simulate the interface's actual distortions such as closure,opening and slippage,a finite element model for the soil-nailing system was built,and its reliability and precision were validated by co

Abstract:讨论了文献中报导的36个边柱节点的试验结果,描述了板的破坏形态和特征.基于剪应力线性分布假设,推导出校核由剪力偏心传递的部分不平衡弯矩系数α0的表达式,并对试验结果作了验证,发现规范(GB 50010-2002)中的α0值与试验结果不符,取值偏大.另外,还指出在板与柱之间不由剪力传递的这部分不平衡弯矩(1-α0)Munb,应通过板受弯来传递,此弯矩所需要的钢筋设置,在规范(GB 50010-2002)中没有条款.最后对边柱节点受冲切设计方法提出了改进意见.

Abstract:This paper put forward a way to estimate the springback of real stamping part based on reverse engineering(RE).The surface of the real stamping part was reconstructed by laser scanning,and the nodes mapping relationship was acquired by means of compelling

Abstract:An implementation of the smoothed particle hydrodynamic(SPH) method was presented to treat multi-phase flows with strong discontinuity.The standard SPH theory was modified and implemented to simulate two-phase flow with big density ratio by normalizing th

Abstract:The basic problems of towing excitation for 154T motor dump trucks were discussed.The weakness of traditional PID controllers and the advantage of PID controllers based on genetic algorithms were analyzed,and the principles,basic problems and realizing pr

Abstract:This paper presented several digital Pulse Width Modulation(PWM) techniques for sine inverter power.The principle,feature and relation of each technique were analyzed and compared.By constructing an experimental platform of 3-phase PWM inverter,the digita

Abstract:A new approach with high accuracy for solving numerical integration was presented.The idea was to use a Fourier series to approximate a unknown function by training the weights of neural networks,and then to use the Fourier series trained by neural networ

Abstract:The effects of the content of Al on the microstructure,solidification behavior and mechanical properties of the Mg-6Zn system were investigated by metallograph,DSC and tensile tests.The as-cast Mg-6Zn-2Al alloy was characteristic of the best balance betwe

Abstract:Fe-B films were prepared by electroless deposition on brass substrate coupled with aluminum from the sulphate bath.The deposition behavior of Fe-B film was investigated by electrochemical and gravimetrical measurements.The results showed that the coupled

Abstract:研究了快速热处理系统中卤钨灯阵列的排列方式和硅片接受到的辐照度均匀性的关系,设计了一种可以满足硅片温度均匀性要求的轴对称排列的灯阵列形式.卤钨灯分布在三个半径分别为5,10,16.8 cm的同心圆上,线密度分别为0.127,0.191,0.341cm-1,加热头高度为10.2 cm.此时辐照度的标准差有最小值,保证了硅片边缘和硅片中心能够得到尽可能一致的辐照.接着进行了P离子注入快速热退火试验,测量比较了退火后样品的方块电阻值,获得了快速热退火的最佳温度时间关系参数.对于剂量7.0×1015cm-2,能量60 keV的P离子注入,快速热退火的最佳温度为1000°C,稳定10 s.

Abstract:The corrosion monitoring system was composed of a hydrogen sensor with Pd_(75)Ag_(25) alloy film,a model CP5 potentiostat and a computer.The hydrogen sensor signal was steady and reliable.The equations between 16MnR steel corrosion rate and steady current

Abstract:The three-dimensional stereo-structure of cyclic glycerothiophospholipid conjugate was modeled via the software of ChemOffice,which showed there was less stereo-hindrance at the terminal carbon of 1,2,3-dioxaphospholane of cyclic glycerothiophospholipid c

Abstract:在25 ℃,污泥浓度20 g/L条件下,以硫酸铁为萃取剂对两种污泥(W1＆W2)进行重金属浸出研究.结果表明,向污泥中投加硫酸铁能导致污泥酸化和污泥中重金属的溶出.投加量越大,污泥pH值降得越低,重金属的溶出率也越高.向W1中投加按Fe3 计算为1.5 g/L硫酸铁时,其pH值降至3.02,Cd,Cu,Zn溶出率分别可达到82.5%,70.9%和89.0%;向W2中投加4.5 g/L Fe3 ,其pH值降至3.19,Cd,Cu,Zn的溶出率分别可达到80.0%,88.2%和92.1%.在相同pH条件下,Fe3 比硫酸能更有效浸出污泥中重金属;用Fe3 浸提污泥中重金属能达到与生物淋滤法同等的溶出效果,并缩短了反应时间.用Fe3 浸出污泥中重金属具有一定可行性.

Abstract:Potential influences of South-to-North Water Transfer Project on intake area include: the number of vascular aquatic macrophyte of the river will reduce,the complication of water quality of the Hong-ze Lake will happen,the rainfall and the vegetation of t

Abstract:为了实现结构简单且截止频率可调的多功能N阶电流模式滤波器,提出了一种多输入单输出多功能N阶CCCⅡ(电流控制第二代电流传输器)-C(电容)电流模式滤波器的设计方法.该方法利用信号流图理论构造出N阶多输入单输出电流模式滤波器的信号流图,再根据信号流图综合出滤波器电路.用该方法可以实现出N阶低通、带通、高通及带阻电流模式滤波器.N阶滤波器电路仅由N个CCCⅡ,N个电容及一个多端输出的电流镜构成,且电路中的CCCⅡ仅为CCCⅡ (同相CCCⅡ)而无CCCⅡ-(反相CCCⅡ).通过改变CCCⅡ的外接直流偏置电流可以调节滤波器的截止频率.另外,用该方法所设计的电路参数仅由标准传递函数分母的两项系数之比决定.最后对截止频率为100 kHz的四阶巴特沃斯滤波器进行了仿真,验证了该方法及电路的正确性.

Abstract:The BACKFILL algorithm is not efficient for the CPU utilization of job scheduling in parallel system.A "Take Ten into Five" algorithm was proposed based on the concept of BACKFILL.The CPU free space was adopted as a judgment, and the numbers of jobs were

Abstract:We discussed the global exponential stability of delayed cellular neural networks with general output functions.By using the Lyapunov functional method,we gave a sufficient condition ensuring that the network has a unique equibibrium which is globally exp

Abstract:Based on the theory of left-right equivalence of smooth map germs in sigularity theory,multiparameter equivariant bifurcation problems of state varibles with symmetry and parameters with symmetry were introduced.The unfoldings of such equivariant bifurcat