Abstract:以3阶Hénon映射作为研究对象,应用一类分岔临界准则和投影法分别分析了Hénon映射的Hopf分岔临界值和分岔解的稳定性.并以此数学模型为依据,设计了Hénon电路,基于OrCAD/PSpice建立了相关仿真模块,成功地对Hénon映射的Hopf分岔现象进行了电路模拟.模拟结果表明:该方法可以作为研究非线性动力学现象的一种有效手段,可以有效而直观地对非线性动力学进行研究和分析.

Abstract:Based on the analysis of constitutive materials and construction techniques,the whole consolidation process of composite ground with cement fly-ash gravel(CFG) piles was divided into two stages,i.e.,the initial stage and the late stage.Then,gravel pile me

Abstract:支持向量回归机(SVR)在实际的学习应用中,由于数据时空的复杂性和算法本身的参数选择,学习模型难以达到预期的效果.针对这个问题,提出了基于Boosting集成的支持向量回归机方法.通过在原始数据集加权采样的基础上,进行多次迭代子SVR机器学习,不断调整样本权值再采样,优化机器学习模型,然后对迭代所得的每级支持向量回归结果按某种组合方法进行集成,得到最终的回归函数形式.应用该方法进行了仿真试验和滑坡变形时序预测研究.结果表明:使用集成的SVR进行回归预测较之单一的SVR具有更高的准确性和更好的泛化性.对Boosting与Bagging 2种不同的集成SVR,进行了比较研究,试验结果表明,2种算法性能相差不大,总体上前者强于后者.

Abstract:According to the static experimental research of four specimens composed of concrete-filled steel square tubular column and steel beam,this paper has revealed the mechanism and the failure mode of this kind of connection,and has analyzed some factors incl

Abstract:Based on two cable supported bridges with parallel box girder,a series of wind tunnel tests of the sectional models were performed to study the vortex-induced vibration of the decks.In the tests,two sectional models were all suspended with 8 springs in wi

Abstract:When the upgrade winch works,it needs automatic shift to meet the purpose of the steady work and light shock.So its key part is the automatic shift. Based on the virtual prototype technique,this paper implemented a design research proceeding from configur

Abstract:以3阶Hénon映射作为研究对象，应用一类分岔临界准则和投影法分别分析了Hénon映射的Hopf分岔临界值和分岔解的稳定性．并以此数学模型为依据，设计了Hénon电路，基于OrCAD／PSpice建立了相关仿真模块，成功地对Hénon映射的Hopf分岔现象进行了电路模拟．模拟结果表明：该方法可以作为研究非线性动力学现象的一种有效手段，可以有效而直观地对非线性动力学进行研究和分析．

Abstract:A new pattern search algorithm using chaos was proposed,in which the ergodicity of chaos was applied to produce stochastic move direction and length in exploratory move.Moreover,two-staged pattern move was employed for different search phases.The global s

Abstract:The operating principle and the harmonic suppression scheme of a new-type converter transformer and its filtering system were described.The harmonic model new-type converter transformer and its filtering system were established and the harmonic current di

Abstract:A new algorithm for multimodal function optimization was presented by introducing a cluster mechanism in the clonal selection process.The cluster operation divided the population into subpopulations for the stage of selection and reproduction,thus improvi

Abstract:This paper presented the realization of the intelligent load analysis, forecasting and management system under NET.The system creatively used the feeling temperature to modify forecast load and organize forecast strategy based on project.Compared with tra

Abstract:通过原位聚合方法制备了聚吡咯(PPy)/磷酸铁锂(LiFePO4)复合材料.傅立叶红外光谱测试表明PPy与LiFePO4之间发生了相互作用;采用扫描电镜观察了PPy在LiFePO4表面的分布情况;采用四探针法、电化学阻抗法及恒电流充放电法测试了复合材料的性能.结果表明:PPy的质量分数为4.69%的PPy/LiFePO4复合材料具有最佳的电化学性能,最小电荷转移电阻为98.83Ω,最大交换电流为0.256 mA,首次放电容量达到154.34 mAh/g,平台容量和平台率分别为133.48 mAh/g和86.48%,并且具有较好的循环性能及倍率性能.

Abstract:A series of potassium silicate solution with different SiO2/K2O mole ratio was prepared and mixed with Zn dust to form serial Zn-rich coatings.Scanning electron microscope(SEM) was used to observe the morphological change of the Zn-rich coatings on mild s

Abstract:On the basis of algebra invariant theory,the expression of Helmholtz's free energy for orthotropic material considering damage effect was derived.Then,the corresponding constitutive relationship and damage evolution equations were obtained,based on irreve

Abstract:The interaction between a screw dislocation and a crack in a confocal elastic elliptical inhomogeneity was investigated.By combining the sectionally holomorphic function theory,Cauchy singular integral,singularity analysis of complex functions and Riemann

Abstract:在孔深60μm直径200 nm的通孔氧化铝模板中,采用恒电流沉积法制备了钯镍与钯银合金纳米线阵列.用扫描电子显微镜和X-射线能谱仪表征纳米线的形貌和成分.研究结果表明:Pd-Ni合金纳米线中镍的含量随着电流密度的增大而增加,电流密度在0.6~1.0 mA.cm-2之间时,合金纳米线中镍的质量分数变化范围为7.89%~15.21%;Pd-Ag合金纳米线中银的质量分数随着电流密度的增大而减少,电流密度在2.0~3.0 mA.cm-2之间时,合金中银的质量分数变化范围为22.88%~16.55%.获得的钯合金纳米线线条均匀连续、结晶致密,长径比高达250.

Abstract:A new type of hydrophilic chitosan nanoparticles encapsulated with BSA(BSA-CS NPs) was prepared through ionic cross-linking technique based on CS and sodium tripolyphosphate(TPP) at room temperature.The influence of formulation conditions on the size of t

Abstract:This paper studied the index technology for Data Cube,and proposed the Dimension Hierarchical Encoding(DHE),which could deal with the hierarchical structure of complex dimensions.The DHE encoded the dimension member value by utilizing the dimension hierar

Abstract:An algorithm was constructed to solve the least squares bisymmetric solution of a class of matrix equation.Some properties of the iterative sequence have been derived,and the method has been shown to preserve convergence properties.Numerical examples show

Abstract:This paper uses the Bayesian method to study the parameters' estimation in the factor model to solve the problem that the current method cannot reveal the information about the parameters in the model.We have designed a mixing prior for the model's parame

Abstract:Three grey models(residual GM(1,1),unbiased GM(1,1),pGM(1,1)) and neural network were combined to propose a new combination forecasting model for forecasting on Composite Stock Price Index of the stock market in Shanghai,China.The results show that this m

Abstract:In the economic development of China,electricity is playing an important role in national economic development,and the study of the relations between electricity consumption and economic growth is necessary.Considering the validity and confidence level of