Research on shakedown analysis for functionally graded material plate under thermomechanical loading

Shakedown is an important problem in the design and analysis of functionally graded structures subjected to cyclic, thermal, and mechanical loadings. Subjected to constant mechanical load and cyclic temperature change, static shakedown of a functionally graded material plate and its homogenous counterpart were analyzed in this article with the approach proposed by the authors previously. The functionally graded material plate is composed of an elastoplastic matrix Al and elastic particles SiC, and the particle volume fraction varies through the thickness. The distributions of the effective mechanical and thermal properties of the composites through the thickness are described graded continuously with an exponential law. The results show that a proper and continuously graded distribution of material properties can efficiently improve the shakedown capability of the functionally graded material plate and also show the significance of shakedown analysis and application for functionally graded material plates.     

经济料条件下原料场生产的质量控制

介绍了安钢经济料条件下原料场生产的质量控制方法.生产实践证明,依据所使用经济料的物理、化学性质采用的分类方法,符合其特有的原料场工艺特点,满足了经济料条件下原料场生产的质量控制要求.     

A labchip for highly selective and sensitive electrochemiluminescence detection of Hg2+ ions in aqueous solution employing integrated amorphous thin film diodes

An electrochemiluminescence (ECL) based detection of Hg²⁺ ions using a novel monolithically integrated labchip technology has been developed. The combination of a chemical sensor molecule, the azacrown ether appended trisphenanthroline ruthenium(II) complex 1, and an amorphous silicon based pin-diode detects an exceptionally low concentration of 66 nM according to a device current of 1.85 pA, respectively. To support a high sensitivity, fluid volumes of 1.2 or 1.8 nL in the designed measuring cells are investigated by an amorphous silicon based pin-diode at a constant flow rate of 1 μL min⁻¹. The working electrode area can be specified for both cells to 0.06 or 0.09 mm² according to a photosensitive detector area of 400 or 500 μm in diameter. Corresponding to the distance between the monolithic integrated polymer based microcapillary and the sensing pin-diode layers of ∼150 μm the detector solid angle was calculated to 73.3°. The fabrication methodology and the experimental details are presented. Furthermore, performance metrics including diode characteristics, detection limit, transient current behavior, dynamic range, and linearity are reported. Additionally, the chemical structure, the ECL response towards different metal ions, and the relationship between ECL intensity of 1 and the concentration of Hg²⁺ ions are shown.     

基于SolidWorks和ANSYS的压缩机壳体分析

介绍SolidWorks模型导入ANSYS中的两种不同方法,比较两种不同方法的优缺点。利用SolidWorks强大的建模能力和ANSYS的分析能力,发挥两者各自的特点,通过Workbench接口,将两者有效结合,从而大大缩短了开发周期,提高了ANSYS的分析效率。     

基于模糊与一致性复合智能算法的"源-网-荷-储"协同控制策略研究

针对可再生能源与储能系统大规模并网使得电力系统成为"源-网-荷-储"多因素的复杂结构,提出采用基于模糊与一致性复合智能算法的"源-网-荷-储"协同控制策略来提升各因素间协同作用.分析"源-网-荷-储"各因素的互动特性与现有电能供应特点,构建协同最优化模型,利用模糊策略改进粒子群算法结合一致性算法的复合智能算法对最优化模型求解.仿真结果表明,利用复合智能算法对系统协同控制,能够显著增大可再生能源的消纳率,还能指导负荷积极响应电网调度.此外,复合智能算法相比单一智能算法在计算精度和运算效率上有大大提升.     

Network security threat assessment based on the signaling game

Nowadays, researches on network security defense based on game theory mostly use completed information or static game theory to establish the attack-defense model. In order to perform security threat assessment in a closer way to the practical situation in a network, this paper proposes a network attack-defense game model based on the signaling game, which is modeled in a dynamic and uncompleted way. After putting forward the solving process of the perfect Bayesian equilibrium of the signaling game, this paper analyzes all kinds of equilibriums existing in the game. Taking the posterior belief as the defender's prediction of the attacker's type, this paper puts forward the assessment algorithm for the network security threat based on the model above, predicts the security threat the defender is facing, and provides the security threat grade for the evaluator. Finally, the feasibility and validity of the model and the method proposed by this paper are testified through the analysis of a network example.     

Optimal strategy selection method for moving target defense based on signaling game

To solve the problem of the optimal strategy selection for moving target defense,the defense strategy was defined formally,the defense principle from the perspective of attack surface shifting and exploration surface enlarging was taken into account.Then,network attack-defense behaviors were analyzed from the sight of dynamic confrontation and bounded information.According to the analysis of attack-defense game types and confrontation process,the moving target defense model based on signaling game was constructed.Meanwhile,the method to quantify strategies was improved and the solution of perfect Bayesian equilibrium was proposed.Furthermore,the optimal defense strategy selection algorithm was designed by the equilibrium analysis.Finally,the simulation demonstrates the effectiveness and feasibility of the proposed optimal strategy and selection method.     

Storm流式计算框架反压机制研究

Storm集群提供了强大的实时处理能力,Storm上下游处理节点由于任务差异而导致数据流元组Tuple处理超时从而影响系统吞吐量及其性能。针对该问题,提出了一种能够灵活调节Topology中各环节数据负载的反压机制,该机制采用可变队列,并根据当前Tuple负载动态调整队列大小,以适应数据负载的动态变化,并提升系统吞吐量。实验结果表明,该反压机制能够避免反压过程中出现数据流的震荡,同时提高系统性能和稳定性。     

聚醋酸乙烯乳液互穿网络聚合物的研制

本文提出添加少量含活性基因的酸性物质，可制得具有优异冻融稳定性，保存稳定的聚醋酸乙烯乳液互穿网络聚合物．介绍了制备方法、性能．     

Network security threat warning method based on qualitative differential game

Most current network security research based on game theory adopts the static game or multi-stage dynamic game model,which does not accord with the real-time change and continuity of the actual network attack-defense process.To make security threats warning more consistent with the attack-defense process,the threat propagation process was analyzed referring to the epidemic model.Then the network attack-defense game model was constructed based on the qualitative differential game theory,by which the evolution of the network security state could be predicted.Based on the model,the qualitative differential game solution method was designed to construct the attack-defense barrier and divide the capture area.Furthermore,the threat severity in different security states were evaluated by introducing multidimensional Euclidean distance.By designing the warning algorithm,the dynamic warning of the network security threat was realized,which had better accuracy and timeliness.Finally,simulation results verify the effectiveness of the proposed algorithm and model.