Abstract:提出了卡环弹性结构弯曲成形计算模型.对弯曲成形工序进行分析,提出了成形内径、搭叠长度和弹性核高度的计算模型;对卡环弯曲成形工序进行了模拟,并结合实验讨论了成形内径、搭叠长度和弹性核高度的影响.研究表明:计算结果与实验结果吻合较好.当内胎模直径从Φ87.5 mm增加到Φ95.0 mm,成形内径从Φ92.0 mm增加到Φ100.0mm.Φ98 mm卡环的搭叠长度建议为8.0～12.0 mm.

Abstract:A new type of bolted end-plate joint with steel beam and reinforced concrete column was developed,and two full-scale subassemblies were tested to evaluate the seismic performance of the joint details.Experimental results showed that this type of composite

Abstract:Aiming at the premature distresses of a virtual highway pavement,the axle weights of overloading vehicles and tire-pavement contacting areas and pressures were investigated.Mechanical responses of the asphalt pavement and cement concrete pavement structur

Abstract:Simplified pile model and multi-segment beam element model were adopted to simulate frames supported by some isolated piles.The free vibration characteristics of a seven-story reinforced concrete(RC) frame supported by some isolated piles were studied.And

Abstract:Based on the investigation of widely used slope software along with the development of information technology,a borehole information based stratum modeling method has been proposed.In this method,borehole information was introduced into a predefined slope

Abstract:The theoretical foundation of the user and the selection of some factors determine the calculation accuracy in the simulation of the architectural numerical wind tunnel.To this question,the calculated results of some computational fluid dynamics(CFD) nume

Abstract:采用醋酸铵反复作用法测得了不同配比粘土固化浆液结石体的阳离子交换容量,利用原子吸收分光光度仪测定溶液浓度,通过室内吸附平衡实验研究了粘土固化注浆帷幕对重金属离子的吸附特性.结果表明:粘土固化注浆帷幕对Pb2 和Cd2 的吸附能力与浆液配比密切相关,在室温和pH 5.0条件下浆液组分中水泥与粘土质量比为2∶4时吸附能力最强;实验条件下Pb2 的吸附量大于Cd2 ;Pb2 和Cd2 之间存在竞争吸附,Pb2 的竞争吸附系数大于Cd2 ,且Pb2 的吸附速率大于Cd2 ;粘土固化注浆帷幕对Pb2 和Cd2 的吸附过程符合Freundlich等温吸附曲线模型,相关系数在99%以上.

Abstract:This paper presented a new structural style,i.e.cable-supported spatial grid,which was applied in large span dry coal sheds.The influence of the configuration of cable on the force of cable and beam,the ratio of beam force to cable force and the deflectio

Abstract:A truly meshless local Petrov-Galerkin(MLPG) method was presented to solve nonlinear boundary value problems.A simple Heaviside test function was chosen to overcome the computationally expensive problems.The computational effort was significantly reduced

Abstract:Based on the theories of digital conjugate surface and gear meshing,a method for machining Digital Gear Tooth Surfaces(DGTS) was proposed.The study focused on the conjugate motion between the DGTS represented by discrete points and the cutter figuration d

Abstract:提出了卡环弹性结构弯曲成形计算模型.对弯曲成形工序进行分析,提出了成形内径、搭叠长度和弹性核高度的计算模型;对卡环弯曲成形工序进行了模拟,并结合实验讨论了成形内径、搭叠长度和弹性核高度的影响.研究表明:计算结果与实验结果吻合较好.当内胎模直径从Φ87.5 mm增加到Φ95.0 mm,成形内径从Φ92.0 mm增加到Φ100.0mm.Φ98 mm卡环的搭叠长度建议为8.0~12.0 mm.

Abstract:Aiming at the slow rapidity of convergence and the easiness to precocity of basic genetic algorithm,the authors have presented a synthetically improved genetic algorithm and have applied it to power system aggregate load modeling.This improved genetic alg

Abstract:This paper has proposed a new structure of three-phase multi-function electric energy meter based on USB host technology.A three-phase multi-function electric energy meter based on USB specification 1.1 was designed.The hardware circuit and EMC design tec

Abstract:Submicron structural WC-12Co coatings were deposited by HVOF spraying. The properties of microhardness and the abrasive wear of the coating were investigated.Phases of the feedstock powders and the coating were analyzed by XRD.The characterizations of spr

Abstract:采用铜模铸造法研究了Fe-Nd-Al系合金块状非晶的成分范围、合金元素对非晶形成能力的影响、Fe-Nd-Al系块状非晶的形成能力与约化晶化温度的关系.研究结果表明,Fe-Nd-Al系合金的非晶形成能力很强,成分在Fe50~42.5NdyAl7.5~17.5范围内能制得直径达2~3 mm的非晶棒材;添加B,Ni,Co,Y,Zr,Si,Ti替代部分Al可以提高合金的GFA;合金的Tx/Tm值愈高,非晶形成能力越强.

Abstract:建立了微波辅助萃取-气相色谱法测定大米中有机磷农药的分析方法.对萃取液、微波加热条件进行了优化实验.3种有机磷农药标准曲线的线性回归系数均在0.998以上,曲线范围为10~800μg/kg;检出限在1~5μg/kg之间;其回收率均在73.6%~94.5%内;相对标准偏差在1.5%~7.5%之间.

Abstract:采用大孔全氟磺酸树脂作催化剂,苯与乙醛缩合生成1,1-二苯基乙烷,后者与单苄基甲苯掺配的油的理化电气性能与日本SAS-40油相同.通过回归正交优化实验,获得了缩合反应的最优工艺条件:催化剂用量10.05%,苯与乙醛的摩尔比8.00∶1,在回流温度下反应2.42 h.在最优工艺条件下,1,1-二苯基乙烷的收率达64.94%.

Abstract:The entanglement degrees of two coupling-atoms interacting with a single-mode vacuum field in the Tavis-Cummings model were investigated by using quantum relative entropy.The influence of the dipole-dipole interaction between atoms on the entanglement deg

Abstract:为了探究频域信号的有用信息,提出了将不同频段的谱功率作为一个独立的信源计算其信息熵的新方法.以年轻(21~34岁)与年老(68~81岁)二组健康人及一组心率不齐患者(66~89岁)的心电图(ECG)为实验数据,根据其频域特征选取多个不同频段计算功率谱熵.结果表明,在0.7~1.5 Hz和1.5~5 Hz频段内的ECG功率谱熵,年轻健康组明显大于年老健康组(P<0.01,P<0.001),年老健康组明显小于其年龄相近的心率不齐病人组(P<0.001,P<0.001),用全频段分割法也得出了类似的结果.不同频段的功率谱熵是分析ECG信号的有效指标.

Abstract:After analyzing the existing problems in searching stock information from the internet,this paper gave a stock information representation model with the technology of semantic web.Firstly,stock ontology was defined,corresponding RDF schema were shown and

Abstract:We first perturb the general semidefinte programming into a quadratic semidefinite programming,which,in its dual variable space,is equivalent to a linear projection equation.Then,we propose a class of projection and contraction methods for semidefinte pro

Abstract:This paper establishesd a risk pricing model based on credit rating system.The analysis of the model demonstrated that the price of a loan was not only determined by the borrower's defaults and the expected recovery of the loan,but also by the change of t