Abstract:Based on the dynamic behavior of large span reticulated spherical dome,some methods were proposed for the nonlinear analysis and the dynamic stability behavior of double-layer reticulated spherical dome under strong earthquake motions.Both geometrical non

Abstract:Combining the improved capacity spectrum method with seismic design theory of multiple performance objectives,a seismic design method of displacement-based capacity spectrum with multiple performance objectives was proposed.Using the proposed seismic desi

Abstract:Because that the elasto-plastic calculation and analysis capacity of the professional structural design software for the structural behavior of high-rise buildings under severe earthquakes is not enough,this paper taking a practical two-tower high-rise st

Abstract:Three axial compressive stresses of concrete core column in grouted concrete masonry were studied.The method of elastic modulus for grouted concrete masonry was presented.Based on lots of grouted concrete masonry tests,the formulas of poisson's ratio,peak

Abstract:Based on recursive stochastic finite element method(RSFEM),a random damage identification method for frame and infilled frame structures was developed.The control equations of random damage index were set up after random damage index was defined.Structura

Abstract:A finite element model for Xiangtan Xiangjiang 4th Bridge was established with ANSYS software, the mechanical properties of the truss arch rib were investigated, and a new loading method of the load test was proposed. Based on the new method, live load la

Abstract:提出了一种以测量机器人为采集器,通过获取合作目标的几何信息进行桥梁挠度测量的新方法,从测量系统误差、偶然误差两个方面分析了测量机器人的测角及测距误差,并探讨了竖直角、视距对挠度测量误差的影响,同时依据最小二乘原理分析了该方法的测量精度.经分析得知:如果仪器至后视点距离小于150 m,至目标点距离小于200 m,挠度测量精度将优于±1 mm.在实际工程中,该方法测量的挠度值与电子水准仪测量的挠度值差异小于0.22 mm,相对误差小于3.3%,表明该方法在大跨径桥梁检测中完全能满足测试要求.

Abstract:Aiming at the signal characteristic of impact test,a zero-phase digital filter was analyzed and designed.Based on the virtual instrument software LabVIEW,a new signal sequence was constructed from the original data using the time domain extension algorith

Abstract:A process test of the super-high speed grinding for 40Cr was done by CBN grinding wheel at the speed of 90-210 m/s . This paper analyzed the influence of the air bonds around the grinding wheel on the super-high speed grinding technological experiment pro

Abstract:The structure and the basic working principle of CVT speed ratio control system were analyzed,and the analysis results showed that the system performed a feeble nonlinear characteristic with pure time-delay.The disadvantages of the general PID control alg

Abstract:A vibration control method for the non-proportional structure damping system was presented.Resolving a modal damping matrix into a diagonal matrix and a off-diagonal matrix,in which the diagonal elements were equal to zero and the off-diagonal elements we

Abstract:This paper investigated the power transmission of contactless inductive coupled power transfer system with multiple loads by utilizing its mutual inductance model.Adding a boost circuit to the pick up side,a decoupling control strategy was proposed.Power

Abstract:A new approach for power quality disturbances(PQDs) classification was proposed,which was based on wavelet transform and decision tree classification algorithm.By wavelet multi-resolution analysis, the energy distribution of PQDs at different frequency ba

Abstract:Aiming at the mixed-signal circuit testing,an integrated built-in self test(BIST) architecture for testing on-chip high speed ADC was presented.The static parameters of ADC were extracted from the histogram of ADC's out codes,which was stimulated with tri

Abstract:The current mesh simplification methods can not preserve 2-manifold of models,so this paper presented two topology operations,CutHandle and CreateHandle.These two operations can preserve 2-manifold of models,and do not change the appearance of models.CutH

Abstract:在丙烯酸酯乳液聚合过程中,引入由正硅酸乙酯水解原位形成的纳米SiO2,制备了纳米SiO2/聚丙烯酸酯复合乳液.利用红外光谱(IR)、扫描电镜(SEM)以及综合热分析等手段对所制备的乳胶膜进行了表征.结果表明,该复合乳液中无机相网络与有机相网络相互穿插,所得涂膜的热分解温度及热稳定性较相应的丙烯酸酯类乳液干膜有显著的提高.

Abstract:以合金化元素与组织和性能关系为研究对象,从42组实验数据中,选取33个作为训练样本,9个作为验证样本,采用BP神经元网络原理,以珠光体球墨铸铁组织和力学性能的主要影响元素作为输入量,模型由3层神经元组成,分别为输入层、隐含层和输出层,建立了合金成分对珠光体含量的影响规律的神经网络模型,珠光体含量、铁素体含量及球化率和硬度及强度关系的神经元网络模型.用建立的网络模型预测结果表明,该方法对球墨铸铁的珠光体含量和力学性能预测具有很好的准确性,有效地解决了球墨铸铁化学成分、显微组织与力学性能之间的关系难于描述的问题.

Abstract:溴化铜在乙醇中溴化4,4-二甲基-1-芳基-3-戊酮,得到α-溴化产物不经分离直接与硫脲环合制得9种2-氨基噻唑类新化合物,收率21.9%~92.9%.目标物2-氨基噻唑类化合物经核磁谱、红外光谱、质谱测定其结构.用单晶X-射线衍射测定了化合物1g.HBr的晶体结构.化合物1g.HBr晶体属单斜晶系,空间群为P2(1)/c,晶胞参数为:a=0.96 713(5)nm,b=1.558 25(8)nm,c=1.306 87(7)nm,Z=4,V=1.665 34(15)nm3,Dc=1.577 g/cm3,F(000)=800,R1=0.0313,ωR2=0.0757,S=1.024.

Abstract:Polymethylvinylsilane was synthesized in the ultrsonic coupling method using dichloromethylvinylsilane as the monomers.The poly(methlvinylsilane-co-methylphenylsilane) and the cross-linked polymethylvinylsilane were synthesized in the same method.They wer

Abstract:Supported by remote sensing(RS) and geographical information system(GIS),this paper adopted multi-source spatial information to construct the digital environment model for areas made of grid data.Through overlay analysis of the synthetic assessment model,

Abstract:For the two seemingly unrelated regression systems,improved c-k estimators of the parameters are presented when the design matrix is ill-conditioned.Under the MSE criterion,some properties of the improved c-k estimators are given.