关于粘性导数的几个性质的探讨

M .G .Crandall等人在文 [1]中给出了函数的粘性导数的概念。在这个概念的基础上我们讨论了函数的粘性导数的上 (下 )导集的几个性质 :在函数可微点处的性质、闭凸性质、与C1类函数的和的性质、与C2 类函数的差在严格局部极大 (小 )值点的性质。     

人工免疫理论在一类病毒检测中的应用研究

人工免疫系统由于其解决问题的方式存在许多内在的优越性而在计算机安全领域中得到广泛的应用。本通过对一类涉及到对中断向量表进行操作的计算机病毒作用机理的研究，提出了一种基于免疫理论的计算机病毒检测技术。实验表明，本提出的方案能高效、准确的检测出该类病毒的存在并加以清除。     

基于HTN动态教学规划系统的研究

采用人工智能领域的层次任务网络(HTN)规划方法及相关的简单层次序列规划器2(SHOP2)构建一个动态教学规划系统(DTPS)。介绍了动态教学规划系统所必须要实现的功能,HTN规划及SHOP2的相关知识,及DTPS的系统特点。并介绍了如何设计一个用于描述教学活动的HTN规划的领域表示,以及DTPS系统的整体架构。最后用DTPS实现的规划实例,进一步阐述该技术在教学规划领域内的应用前景。     

Research progress on Fabry-Perot resonator antenna

The Fabry-Perot resonator （FPR） antenna has found wide applications in microwave and millimeter waves and recently attracted considerable interest. In this paper, a summary of planar and cylindrical structures, analytic models and research development is presented, and a comparison between these structures and analytic models is made, showing that such analytic models as the FP cavity mode, electromagnetic band gap （EBG） defect mode, transmission line mode, and leaky-wave mode are consistent when applied to analyze this type of resonator antenna. Some interesting topics under recent research, including dual or multi-band, improvement of gain bandwidth, low profile and beam control, are surveyed.     

Review: Research progress on Fabry-Perot resonator antenna

The Fabry-Perot resonator (FPR) antenna has found wide applications in microwave and millimeter waves and recently attracted considerable interest, in this paper, a summary of planar and cylindrical structures, analytic models and research development is presented, and a comparison between these structures and analytic models is made, showing that such analytic models as the FP cavity mode, electromagnetic band gap (EBG) defect mode, transmission line mode, and leaky-wave mode are consistent when applied to analyze this type of resonator antenna. Some interesting topics under recent research, including dual or multi-band, improvement of gain bandwidth, low profile and beam control, are surveyed.     

Two-stage evolutionary algorithm for dynamic multicast routing in mesh network

In order to share multimedia transmissions in mesh networks and optimize the utilization of network resources, this paper presents a Two-stage Evolutionary Algorithm （TEA）, i.e., unicast routing evolution and multicast path composition, for dynamic multicast routing. The TEA uses a novel link-duplicate-degree encoding, which can encode a multicast path in the link-duplicate-degree and decode the path as a link vector easily. A dynamic algorithm for adding nodes to or removing nodes from a multicast group and a repairing algorithm are also covered in this paper. As the TEA is based on global evaluation, the quality of the multicast path remains stabilized without degradation when multicast members change over time. Therefore, it is not necessary to rearrange the multicast path during the life cycle of the multicast sessions. Simulation results show that the TEA is efficient and convergent.     

Progress in the inductive strategy-use of children from different ethnic backgrounds: a study employing dynamic testing

This study investigated potential differences in inductive behavioural and verbal strategy-use between children (aged 6–8 years) from indigenous and non-indigenous backgrounds. This was effected by the use of an electronic device that could present a series of tasks, offer scaffolded assistance and record children’s responses. Children from non-indigenous ethnic backgrounds, starting at a lower level, profited as much from dynamic testing as did indigenous children but were unable to progress to the standard of this latter group. Irrespective of ethnic group, dynamic testing resulted in greater accuracy, fewer corrections, and reduced trial-and-error behaviour than repeated practice. Improvements in strategy-use were noted at both the group and individual level. After dynamic training, children from both ethnic groups showed a superior capacity for inductive reasoning although indigenous children subsequently used more inductive strategies. The study revealed individual differences between and within different ethnic groups and variability in the sorts of help required and subsequent strategy progression paths.     

开孔结构动力特性及动力响应试验研究

本文对开孔(水工)结构进行了结构动力特性和规则波作用下结构动力响应的模型试验,并用有限元法计算了结构自振特性,分析了3种水位、不同波高、周期情况下结构的动力特性和结构的动力响应.     

Mixed nonlinear dynamic voltage phasor tracing method based on WAMS/SCADA

By considering the static voltage characteristic of the load, we propose a WAMS/SCADA mixed nonlinear method to estimate the voltage of unobservable buses caused by topology change or phasor measurement unit （PMU） malfunction in a power system. By modeling the load characteristic with data from SCADA, we employed the Gauss-Seidel method to solve the nonlinear equations and estimate the voltage of unobservable buses with the high precision voltages of neighboring buses measured by a PMU. Simulations were carried out on the IEEE 39-bus system, and the results show that this novel method can dynamically and accurately trace the variation of the voltage phasor of the unobservable buses.     

肉桂酸分子的密度泛函理论研究

采用Gaussian 09程序包中的密度泛函理论(DFT),在B3LYP/6-311+G**水平上,对肉桂酸分子进行了几何构型优化和频率与热力学性质的计算,得到肉桂酸的红外光谱和不同温度下的热力学性质,并对红外光谱进行了归属.结果显示肉桂酸分子E型构型比Z型稳定,二者能量相差27.53625KJ.mol-1;在标准压力下和298-1000K温度范围内,肉桂酸分子的标准摩尔焓(Hm)、标准摩尔热容(Cpm)、标准摩尔熵(Sm)与温度(T)之间呈现二次函数关系.     

On-line real-time path planning of mobile robots in dynamic uncertain environment

INTRODUCTION Path planning of mobile robots is one of the key issues in robotics research on the problem of a robot finding a collision-free path from beginning to goal in the presence of obstacles. Depending on the envi- ronment surrounding the robot, it can be classified as follows: (1) Path planning for static obstacles in com- pletely known environment; (2) Path planning for static obstacles in un- known or partially known environment; (3) Path planning for dynamic obstacles in com- p…     

大跨径悬索桥动载试验研究

为检验在役大跨径悬索桥结构的动力性能,对主跨128 m地锚式悬索桥进行动力试验.测试其自振频率、振型和阻尼比;激振试验中,测试桥跨结构在汽车以不同速度通过桥跨和在桥上特定位置跳车时桥跨结构的动应变、动位移、振幅以及加速度等动力响应,计算得出冲击系数.并将实测结果与有限元结果进行对比分析.结果表明,该悬索桥具有较好的竖向刚度、横向刚度;汽车在桥上运行时对桥跨结构有一定的冲击作用但并不明显,有障碍行车舒适度较差.     

马克思主义视域下的人工智能技术异化现象探析

当技术产生异化就会转化成一种外在的、异己的、敌对的力量,危害社会,反制人类。运用马克思技术异化理论分析当代人工智能,从人与社会两个维度出发,发现其技术异化的实质,推断未来发展趋势,发展其利,规避其害,对人类未来发展意义重大。     

D406A钢K_(Ic)与动态力学性能的相关性研究

为总结D406A钢的静态断裂韧性KIc值与动态力学性能间的关系,分别采用三点弯曲试样以及标准冲击试样对D406A钢进行了KIc测试和仪器化冲击试验,发现室温下该材料的冲击功CVN与断裂韧度KIc存在着相同的变化趋势,两者间的对应关系与修正后的Rolfe-Novak经验公式基本相符,今后可以通过该公式来推断材料的KIc值。利用标准冲击样所获得的动态断裂韧度KId与静态断裂韧度KIc虽遵循相同的变化规律,但相关性不是特别理想,这主要是由于一方面动态加载条件下试样的受力情况远比静态下要复杂,这更容易导致KId的离散;另一方面标准冲击样并不是一个理想的裂纹体,缺口尖端在断裂之前会普遍屈服,这也会给KId的计算带来较大误差。     

钢纤维自应力混凝土长期变形性能的研究

通过试验研究钢纤维自应力混凝土试件的长期变形性能,性能参数包括钢纤维掺量、自应力等级、配筋率等。试验表明,随着龄期的增长,试件的变形没有出现较大的回缩,即自应力混凝土的自应力不会随着时间的推移而逐渐丧失,其耐久性是可以保证的。     

信息时代的个人知识管理探微

在技术进步日新月异的信息时代,个人知识的系统高效管理已经成为知识经济发展的必需。本文探讨了个人知识管理的基本概念和主要内容,着重介绍如何利用先进的信息技术工具辅助个人知识管理,最终实现个人知识管理系统的构架。     

An artificial neural network approach for prediction of long-term strength properties of steel fiber reinforced concrete containing fly ash

In this study, an artificial neural network （ANN） model for studying the strength properties of steel fiber reinforced concrete （SFRC） containing fly ash was devised. The mixtures were prepared with 0 wt%, 15 wt%, and 30 wt% of fly ash, at 0 vol.%, 0.5 vol.%, 1.0 vol.% and 1.5 vol.% of fiber, respectively. After being cured under the standard conditions for 7, 28, 90 and 365 d, the specimens of each mixture were tested to determine the corresponding compressive and flexural strengths. The pa- rameters such as the amounts of cement, fly ash replacement, sand, gravel, steel fiber, and the age of samples were selected as input variables, while the compressive and flexural strengths of the concrete were chosen as the output variables. The back propagation learning algorithm with three different variants, namely the Levenberg-Marquardt （LM）, scaled conjugate gradient （SCG） and Fletcher-Powell conjugate gradient （CGF） algorithms were used in the network so that the best approach can be found. The results obtained from the model and the experiments were compared, and it was found that the suitable algorithm is the LM algorithm. Furthermore, the analysis of variance （ANOVA） method was used to determine how importantly the experimental parameters affect the strength of these mixtures.     

An extended discrete particle swarm optimization algorithm for the dynamic facility layout problem

We extended an improved version of the discrete particle swarm optimization （DPSO） algorithm proposed by Liao et al.（2007） to solve the dynamic facility layout problem （DFLP）. A computational study was performed with the existing heuristic algorithms, including the dynamic programming （DP）, genetic algorithm （GA）, simulated annealing （SA）, hybrid ant system （HAS）, hybrid simulated annealing （SA-EG）, hybrid genetic algorithms （NLGA and CONGA）. The proposed DPSO algorithm, SA, HAS, GA, DP, SA-EG, NLGA, and CONGA obtained the best solutions for 33, 24, 20, 10, 12, 20, 5, and 2 of the 48 problems from （Balakrishnan and Cheng, 2000）, respectively. These results show that the DPSO is very effective in dealing with the DFLP. The extended DPSO also has very good computational efficiency when the problem size increases.     

长期大运动量耐力训练对大鼠肾动脉组织学影响的研究

通过对耐力训练大鼠肾动脉的零应力状态下的张开角、组织学组成成份的变化,探讨耐力训练对肾动脉的张开角和微观组织结构的影响.结果表明,耐力训练组大鼠肾动脉张开角与对照组相比明显减小(P<0.05);耐力训练组大鼠肾动脉的弹性纤维、胶原纤维的含量与对照组没有显著性差异(p>0.05),C/E没有显著差异(p>0.05);耐力训练组大鼠的平滑肌的相对面积显著减小(p<0.05),而平滑肌的细胞核数并无显著差异(p>0.05),单个平滑肌的相对面积显著减小(P<0.05).因此,长期耐力运动训练主要导致肾动脉中平滑肌的重建.     

基于BNEP蓝牙移动终端接入网络的研究

在对蓝牙技术和无线个人局域网进行分析和研究的基础上,详细地介绍了移动终端设备软件和蓝牙局域网接入点NAP在Windows系统上的实现过程。在防御蓝牙配对PIN码攻击方面提出了一种新的防御算法,提高了蓝牙网络的安全性能。