摘要：设计变电站远程智能巡检图像目标快速识别算法,通过高效的目标识别性能,提升变电站巡检水平。利用无人机搭载相机,采集变电站远程智能巡检图像,通过小波变换方法滤波处理所采集的智能巡检图像。利用自适应阈值分割方法,分割已滤波处理的变电站远程智能巡检图像,将智能巡检图像划分为前景图像与背景图像。以智能巡检图像的前景图像为基础,构建高斯差分金字塔,提取图像的SIFT特征。依据所提取智能巡检图像的SIFT特征构建样本集,作为特征加权支持向量机的输入,利用特征加权支持向量机输出目标快速识别结果。实验结果表明,该算法可以快速识别变电站远程智能巡检图像中的目标,目标识别时间低于500 ms。

摘要：本研究根据BIM建筑构件的信息分类和编码需求,通过调研国内外建筑工程主要信息分类与编码方式,包括传统的基于设计使用与施工分包的不同线分法方式、现代信息技术中的面分法方式以及国家信息分类标准,提出了一个可供工程使用精准性与效率性相平衡的一维字符串编码方式,以便于建筑工程全生命期各个阶段、各个参与方、各种专业维度的信息交互。

摘要：以耐寒性强的“常夏石竹”品种为试验材料,设置T1(草炭∶珍珠岩=1∶1)、T2(草炭∶珍珠岩∶河砂=2∶1∶1)、T3(草炭∶珍珠岩∶河砂=1∶1∶1)、T4(草炭∶珍珠岩=1∶2)、T5(草炭∶珍珠岩=2∶1)5个处理,以草炭作为对照(CK)。研究不同基质配比对常夏石竹生根及幼苗生长的影响。结果表明,不同处理下生根率、生根条数、株高、最长根长、地上干重、地上鲜重、地下鲜重均有显著差异。采用T2作为扦插基质时常夏石竹生根率最高,达到86.98%,结合根系质量、幼苗形态指标及灰色关联度综合分析表明,基质T2、T3更适宜常夏石竹扦插生长。

摘要：Novel transfer functions are presented for a polymer electro-optic mieroring resonator switches. The resonating process ot the light in the microring is simulated using the formulas. Then the optimization of the structural parameters is performed, and the characteristics are analyzed, such as the resonance time, output spectrum, operation voltage, insertion loss and crosstalk were analyzed. The simulation results show that the designed device exhibits favorable switching functions.

摘要：Curve modeling is one of the basic work in computer aided geometric design and computer graphics. For the implicit conic fitting problem in this paper, the research methods that the objective function based on the minimal algebraic distance and geometric distance are summarized. The advantages and disadvantages of every method are analyzed simply, and the applications of the conic fitting are listed.

摘要：Many rock avalanches were triggered by the Wenchuan earthquake on May 12, 2008 in southwest China. Protection galleries covered with a single soil layer are usually used to protect against rockfall. Since one-layer protection galleries do not have sufficient buffer capacity, a two-layered absorbing system has been designed. This study aims to find whether an expanded poly-styrol （EPS） cushion, which is used in the soil-covered protection galleries for shock absorption, could be positioned under dynamic loadings. The dynamic impacts of the two-layered absorbing system under the conditions of rock avalanches are numerically simulated through a 2D discrete dement method. By selecting reasonable parameters, a series of numerical experiments were conducted to find the best combination for the two- layered absorbing system. The values of the EPS layer area as a percentage of the total area were set as 0% （Sl）, 22~ （S2）, and 70% （$3）. 22~ of the area of the EPS layer was found to be a reasonable value, and experiments were conducted to find the best position of the EPS layer in the two-layered absorbing system. The numerical results yield useful conclusions regarding the interaction between the impacting avalanches and the two-layered absorbing system. The soil layer can absorb the shock energy effectively and S2 （0.4-m thick EPS cushion covered with soil layer） is the most efficient combination, which can reduce the impact force, compared with the other combinations.

摘要：The purpose was to clarify the relationship between the main process parameters of micro-plasma cladding and the comprehensive quality(geometry,microstructure and wear rate of cladding track).Self-fluxing ferrous alloy powders were fabricated on Q235 *** on the uniform design,the distribution of the experimental samples was designed reasonably in the sample space,which greatly improved efficiency and reduced *** a series of microstructural characterization,there was no difference in the phase composition of all samples,but the average grain size had a significant difference,which resulted in the change of wear *** the relationship among micro-hardness,average grain size and wear rate of the track had also been ***,an optimization model was established and the optimal process parameters were obtained with excellent wear rate under the geometric *** correctness of optimization model was verified by experiments.

摘要：The harsh operating environment and complex operating conditions of the mine electric locomotive affect the control performance of the locomotive traction *** order to improve the speed control performance of electric locomotive traction motors,a dynamic fractional-order sliding mode control(DFOSMC)algorithm considering uncertain factors was proposed.A load torque sliding mode observer was designed for the complex load disturbance of the traction motor,and its observations were integrated into the DFOSMC controller to overcome the influence of load ***,the stability of the designed controller was proved by Lyapunov's ***,the control performance of DFOSMC controller was compared with integer-order sliding mode controller and fractional-order sliding mode controller through simulation *** with integer-order sliding mode and fractional-order sliding mode controllers,the dynamic and static performance of the DFOSMC controller with load observation is better,and it has stronger anti-interference *** DFOSMC controller effectively improves the control performance of the traction motor of the mining locomotive.

摘要：To solve the defects of bottom concave appearing in the extrusion experiments of complex hollow aluminium profiles,a 3D finite element model for simulating steady-state porthole die extrusion process was established based on HyperXtrude software using Arbitrary Lagrangian–Eulerian(ALE)*** velocity distribution on the cross-section of the extrudate at the die exit and pressure distribution at different heights in the welding chamber were quantitatively *** obtain an uniformity of metal flow velocity at the die exit,the porthole die structure was optimized by adding baffle *** optimization,maximum displacement in the Y direction at the bottom of profile decreases from 1.1 to 0.15 mm,and the concave defects are remarkably *** research method provides an effective guidance for improving extrusion defects and optimizing the metal flow of complex hollow aluminium profiles during porthole die extrusion.

摘要：五四前后留学归来的一批学者,如滕固、宗白华、马采、邓以蛰等,对中国艺术史研究的最大贡献之一就是推动中国艺术史研究由传统模式向现代转型,即在艺术史观、研究方法、写作体式等方面明显区别于传统的艺术史研究,这种转型是基于中西文化交融格局中形成新的文化力量和学者的创造性活动共同作用的结果。