Abstract:采用8节点实体单元模拟主塔和桥墩,考虑塔、墩的剪切变形和初应力对结构刚度的影响,建立了猎德大桥精细化有限元模型.进行了缩尺比为1:60的全桥模型振动台试验,比较了试验和仿真计算结果.在此基础上,研究了实桥的地震响应特征,并对构件的抗震能力进行了评价.研究结果表明:塔根截面、群桩桩顶是结构抗震的关键部位;考虑承台-土压力的影响时,群桩基础的应力可降低13％～25％;精细化有限元模型较好地反映了结构在地震作用下的易损部位.

Abstract:对FBG(光纤布拉格光栅)应变传感器进行了抗电磁干扰、抗零飘、可重复性等性能测试,并与传统的电阻应变片做了对比,验证了其可靠性.通过混凝土模型拟静力试验,验证了FBG传感技术的实用性和可行性.最后,以东海大桥主航道桥为工程背景,进行了FBG传感技术在大型桥梁健康监测中的应用研究.结果表明,FBG传感技术能满足大跨径桥梁结构监测的需要.

Abstract:对包含多种焊接缺陷(T1)和焊接质量高(T2)的两种角焊接T- 型节点受弯下的力学性能进行了试验研究.焊接缺陷通过金相试验检查,试件的母材、焊材及热影响区的材料特性均由拉伸及硬度试验测得.试验考虑了受弯时两种节点的力-应变曲线、破坏形式、破坏机理,并将试验结果与规范规定的设计承载力进行了对比.结果表明,T1 试件的破坏荷载远低于规范设计值,而T2试件的破坏荷载比设计值高30%～40%.采用有限元方法模拟了节点试验,给出了试件的应变发展过程及其应力分布规律;结合对破坏起始位置及裂纹扩展路径的研究表明,焊接缺

Abstract:This paper presents a study of the lateral vortex-induced vibration of a two-dimensional square cylinder at high Reynolds number with the code for the aeroelastic problems based on the loosely coupled method, which is programmed by the authors. The results show that with the increasing of the reduced velocity, the lock-in phenomenon occurs at a particular reduced velocity. The beat phenomenon is also detected due to the interaction of the natural frequency for the cylinder and the natural vortex shedding frequency of the vortex-induced vibrating system. With the increasing of the reduced velocity, the vortex shedding mode of the system changes from out-of-phase 2 s to in-phase 2 s, which is the so-called phase switch phenomenon. The results are also compared with the disseminated results.

Abstract:Based on base balance technique in a boundary layer wind tunnel, the generalized force spectra and RMS coefficients of the first mode of three typical lattice towers in along-wind, across-wind as well as torsional directions were obtained. In light of these results, the analytical models of generalized force spectra of the first mode of the lattice towers were established by applying least-square method. These models are in good agreement with the experimental results obtain by wind tunnel tests, and a 2 -D or 3-D calculation method can be developed on the basis of the models to evaluate wind-induced dynamic responses of typical lattice towers in frequency domain.

Abstract:An analysis is made of seepage forces around shield under river by finite differential method and the stability factor of workface with regard to seepage effects is deduced. The computation results show that the pore water pressure will redistribute in sandy soils around the shield tunnel after excavation and the contour lines of the pore water pressure exhibit sphenoid shape. The pore water pressure changes severely at the excavation face. The contour lines of the total water head display circularly around the excavation face of the tunnel and the maximum value of the .seepage forces exists on the excavation face and shield tail. The stability factor of tunnel face decreases due to the existence ofseepage forces, but the slurry pressure in the shield cabinet benefits the face stability. The results also show that the whole shield head will be trapped in the sharply changing zone of pore water pressure and severe consequences will arise if leakage occurs at the shield tail.

Abstract:目前国内外对沥青路面疲劳方程的研究基本上都是基于室内疲劳试验的结果,没有很好地考虑环境因素的影响.事实上,不同环境地区沥青路面的疲劳寿命是有很大差别的.为此,利用先前建立的沥青路面结构行为方程,从新的角度考虑现场疲劳方程的建立,通过大量的计算分析给出沥青路面现场疲劳方程的环境因素影响系数(函数),为在路面疲劳分析时考虑环境因素的影响提供了可能.

Abstract:大量的试验数据表明,某一温度下沥青混合料的抗压模量同基准温度(20 ℃)下抗压模量的比值(温度修正系数)与温度之间呈线性比例关系.通过收集我国194个气象观测站点50年的日平均气温资料,根据壳牌沥青路面设计方法,考虑不同地区日气温变化情况和沥青粘滞度性质,采用克里金插值法绘制出全国年有效温度分布图;同时考虑路面温度随深度方向上的变化,绘制出全国沥青混合料温度修正系数分布图,以该系数修正不同地区抗压模量的取值.

Abstract:为了分析厚沥青层的柔性基层和半刚性基层沥青路面在轮载作用下各结构层永久变形发生发展的规律,通过在50～60 ℃高温下进行的室内大型足尺环道路面加速加载试验,测试了不同轮载作用次数下沥青路面各结构层的永久变形.环道试验测定结果表明:对于本试验三种沥青层厚度超过20 cm的沥青路面结构,土基对车辙的影响很小,级配碎石柔性基层和水泥稳定碎石半刚性基层对车辙的影响也很小,路面永久变形主要发生在20 cm深度范围的沥青层内.

Abstract:智能体从模拟个人的行为出发,以拟人化方法描述、解释、预测一个复杂系统的行为,可以有效仿真群体的行为形态.针对城市中人群流动这一复杂对象,突破传统思维,以复杂自适应系统理论研究为背景,采用基于多智能体系统的建模方法和自下而上的研究思路,提出了研究城市空间内人群流动形态的模型框架,构建了一个城市人群流动动态演化模型,并在此基础上利用GIS(地理信息系统)技术加以实现.

Abstract:According to the establishment goal of the general bus lane and the advanced bus lane, the average travel speed serves as key indicator to build different levels of service. Then, based on the capacity theory, the theoretical model and the simulation model are used to study two types of bus lane capacities under given levels of service.

Abstract:以完全去除类似隐孢子虫等微粒子为目标,实验选用与隐孢子虫外观尺寸相似的Crypto-tracer-1号示踪微粒子,对金属膜过滤系统在饮用水中的处理性能进行评价和研究.试验选用三种金属膜:金属薄片筛网膜过滤器(Fuji FP -0.3),金属非织网式膜过滤器(Fuji FA- 3),金属粉末烧结膜过滤器(SIKA-R0.5AS).试验对金属膜处理工艺中的水质参数和膜间压力进行测试分析,结果表明,在大规模的给水处理厂中,采用金属膜过滤系统可以在高滤速下完全将类似于隐孢子虫微粒子去除.

Abstract:用氢气还原法制备了线度为10 nm的铂纳米粒子.利用Nafion 的协同作用,将纳米铂和碳纳米管同时修饰到玻碳电极表面,形成纳米管、纳米铂网状结构.此复合修饰电极在HAc -NaAc体系中对萘酚的氧化表现出良好的电催化性能,不仅测量灵敏度高,而且克服了单一碳纳米管修饰电极在萘酚测定中重现性差的问题,结合微分技术,实现了萘酚异构体的同时测定.在浓度为1.0×10-6～8×10-4 mol·-1范围内,1-萘酚和2 -萘酚的半微分氧化峰电流值均与其浓度呈线性关系,检测限分别为5.0×10-7和6.0×10-7

Abstract:为了解使用蚯蚓来评价和控制洛克沙胂环境污染的可能性,研究了洛克沙胂进入土壤环境后,引起蚯蚓体内砷的富集过程,以及富集的砷在无洛克沙胂污染土壤中的释放过程.结果表明:洛克沙胂能引起蚯蚓体内砷的富集,富集因子的对数与土壤砷质量分数的对数呈线性关系;蚯蚓体内砷的消除符合双区一级动力学模型;蚯蚓能用作土壤中洛克沙胂污染的指示生物,而且可以用蚯蚓生物除污技术来减少或控制洛克沙胂的环境污染.

Abstract:以降低管网造价和运行费用为目标,将基因表达混乱遗传算法(GEMGA)引入到供水管网系统的扩建优化设计中,对其在供水管网优化扩建实践领域进行了深入探索.模拟管网扩建实例计算表明:采用优化设计方案后,总投资比采用传统经验法节省近17%;与简单遗传算法(SGA)相比,GEMGA收敛速度大大加快,算例中只搜索约0.000 2%的可行域便找到问题的最优解.

Abstract:借助于示差扫描量热分析(DSC)对不同煤矸石-Ca(OH)2-H2O体系的不同龄期样品的Ca(OH)2质量分数的测定,研究了不同煤矸石-Ca(OH)2-H2O体系的火山灰反应程度.研究结果表明:在不掺激发剂时,火山灰反应消耗的Ca(OH)2量和体系的初始Ca(OH)2含量有关,存在一最佳的Ca(OH)2初始含量;掺入适量的Na2SO4可以使得体系的火山灰反应程度在较短龄期内得到显著的提高;在标准养护条件下,体系的火山灰反应程度稍高于水养护.

Abstract:研究了不同碳纤维掺量的CFRC(碳纤维水泥基材料)梁在三点弯曲荷载作用下其电阻变化与CMOD(裂缝口张开位移)的关系.试验研究发现,峰值荷载前CFRC梁的电阻-CMOD曲线均出现明显的转折点.当碳纤维掺量为胶凝材料质量的0.1%时,电阻-CMOD曲线表现出三个不同的变化阶段,其中第一个转折点接近峰值荷载点.而碳纤维掺量达到胶凝材料质量的0.2%和0.3%时,电阻-CMOD曲线则呈现两个变化阶段,并且转折点随着碳纤维掺量的增加逐渐远离峰值荷载点.电阻-CMOD曲线的第二阶段为线性变化过程,其中碳纤维掺量为0

Abstract:从锂离子动力电池的电流激励-电压响应出发,在改进的FreedomCar电池模型存在的基础上,提出了基于最小二乘法的电池模型参数辨识的方法;根据混合动力汽车的具体应用条件,提出基于电流-时间窗口的SOC(荷电状态)估计方法.该方法已成功应用于电-混合燃料电池轿车"超越三号"的实车运行.

Abstract:This paper presents a research of the dynamic characteristics testing method of the rear wheel of a typical car and new experimental project and testing method based on the four-post vehicle road simulation system. The dynamic characteristics of the toe-in and camber of the rear wheel were measured on the vibration test table. The influences of different input manners were investigated such as the swept input and the stochastic input, the single input and the dual input. And an analysis was made of the testing results and the testing error. The analysis result shows that the testing method is simple and feasible and of great accuracy of measurement. The experiment study provides a new way for the dynamic characteristics testing of the vehicle wheels.

Abstract:通过分析白车身工艺规划的内容与特点,归纳出白车身工艺规划中的信息构成与工艺信息管理需求,分别建立了基于产品数据管理理论的产品零件模型、制造资源模型和工艺知识模型,实现对制造对象、制造资源和工艺知识等工艺信息的管理,并在此基础上,构建以操作为核心的集成反映各生产要素及其相互关系的工艺关系模型.应用表明,该模型很好地实现了白车身工艺规划系统工艺信息管理和工艺规划要求.

Abstract:基于边界条件替代法建立了高炉冷却壁热表面与炉气间的传热系数计算模型.采用试验测量冷却壁温度场和温度场数值计算相结合的方法,确定了炉气温度为505～1 248 ℃时炉气与冷却壁壁体及炉气与捣打料间的传热系数.理论分析了在炉气温度较高时炉气与捣打料间传热系数大于炉气与冷却壁壁体间传热系数的原因,从而改变了以往在冷却壁传热模型计算中冷却壁热表面传热系数只用一个综合传热系数的观点,两种传热系数的区分使传热数值计算精度更高.

Abstract:阐述了一种三维空间力传感器的设计.这种三维空间力传感器由德国HBM公司的普通力传感器构建而成.利用线性内插方法,可以通过一个校准特性场来获得所要测量的力,而这个校准特性场则是采用线性回归方法计算出来的.有限元法仿真的结果、三维激光斑纹测量结果以及经过优化的应变片测量结果表明,所构建的传感器能够有效地测量三维空间力.此外,仿真结果还表明,该三维空间力传感器可以采用现成的元器件来实现,而对这些元器件只需进行少量的改动;并且,新构建的三维力传感器的特性仍然是线性的.

Abstract:This paper presents a study of the application methods of rough sets theory to the main image features obtaining, image automatically recognizing and edges detecting. The color image from the field research was processed. The color characters and texture characters were used to build a decision table including seventeen features. The objects were classified and enhanced by cutting attributes, classifying and rule-obtaining. At the same time,the region edge image was made. The test result shows that this method can better segment the image, enhance the regional image and detect the edge of the image. And the blue standard deviation, red variation, correlation index between red and blue, color feature, contrast and entropy are regarded as the main condition attributes.

Abstract:探讨了适于合成孔径雷达图像斑点噪声滤波的小波基选择与小波提升问题.在分析了利用马尔科夫模型描述小波系数相关性问题的基础上,提出了一种基于小波系数高斯混合模型和隐马尔科夫模型的雷达图像斑点噪声滤波方法.使用几种典型的滤波处理方法,分别对星载和机载的合成孔径雷达图像进行滤波处理.实验表明,所提出的图像滤波方法能够更好地抑制雷达图像的斑点噪声.

Abstract:This paper aims at the network performance of MCU-system. According to the interface and net-driver of ENC28J60, the tasks and moudles are analyzed about the UART-Enternet Bridge, the UART--IP Gateway and the embedded Web Server in control net. A RS485-Entemet Gateway exam- ple is provided based on Microchip TCP/IP stack; and a conception of fresh-value is proposed to uphold arp-cache, The embedded gateway with ENC28J60 and MCU is of simple-inteface and easy to develop,which is suitable for the concentration of meter reading.

Abstract:Based on a non-smooth equation of KKT optimality condition, this paper presents a new QPfree method for inequality constrained optimization by using the Fischer-Burmeister NCP function, which ensures the feasibility of all iterates and makes it unnecessary to search along an arc. To avoid Maratos effect, a high-order modified correction is introduced. Compared with the traditional SQP method, this new method only needs to solve no more than three systems of linear equation per iteration with global convergence and local superlinear convergence under some reachable conditions. Without assuming isolateness of the accumulation point or boundedness of the Lagrangian multiplier approximation sequence, every accumulation point of the iterative sequence generated by this method is a KKT point.

Abstract:This paper deals with the H^2 Corona problem in the Polydise. The problem of Polydise is transformed into that of unit disk and an operator by H^2 Hardy space is defined in the unit disk. This operator proves bounded, and Hahn-Banaeh Theorem and Reize representation are adopted to solve the equation. Furthermore, the estimate of the solution is given.

Abstract:利用投影的对角化,回答了何时C*-代数A的商代数M(A)/A上的投影可以提升为M(A)中的投影这一问题,具体给出了两个等价条件:投影的正元提升是弱拟对角的;投影存在形如∑∞I=1ai的正元提升,其中{ai}是两两正交的正元.对一般的商代数A/I,如果投影p,q存在A中提升p1,q1,且满足σ(p1q1p1)≠[0,1],那么p,q可以提升成保持其直交性及大小关系的投影.

Abstract:讨论一类非强极大的三角UHF代数上的Lie导子.证明如果L是非强极大的三角UHF代数T上的Lie导子,则L形如D λ,其中D是T上的结合导子,λ是从T到其中心Z上的线性映射且零化T中的括积.