摘要：The classical supply chain network(SCN)design problem is extended,where the candidate facilities are subject to failure and the products are prone to elapsed time ***,the reliable SCN design problem is defined by introducing the probability that a facility may be prone to inactivity based on the analysis of perishable product *** perishable product SCN design problem is formulated as a 0-1 integer programming *** objective is to minimize the weighted sum of the operating cost(the fixed plus transportation cost)and the expected failure *** then,the perishable product SCN design model is discussed and solved using the genetic algorithm(GA).The results show how to generate the tradeoff curve between the operating costs and the expected failure *** these tradeoff curves demonstrate empirically that substantial improvements in reliability are often possible with minimal increase in the operating costs.

摘要：There is a tradeoff between generalization capability and computational overhead in multi-class learning. We propose a generative probabilistic multi-class classifier, considering both the generalization capability and the learning/prediction rate. We show that the classifier has a max-margin property. Thus, prediction on future unseen data can nearly achieve the same performance as in the training stage. In addition, local variables are eliminated, which greatly simplifies the optimization problem. By convex and probabilistic analysis, an efficient online learning algorithm is developed. The algorithm aggregates rather than averages dualities, which is different from the classical situations. Empirical results indicate that our method has a good generalization capability and coverage rate.

摘要：We present a high-definition （Hd） 3d laparoscopic system including a dual channel optical system, two cameras, a camera control unit （CCU）, and an Hd 3d monitor. This laparoscopic system is capable of outputting dual high-definition videos and providing vivid 3d images. A modified pinhole camera model is used for camera calibration and a new method of depth measurement to improve precision. The average error of depth measurement measured by experiment （about 1.13 mm） was small in proportion to the large range in distance of the system （10-150 mm）. The new method is applicable to any calibrated binocular vision system.

摘要：The 4-lobe aluminum alloy helical surface rotors are widely applied in industry,such as ***,the conventional manufacturing processes of aluminum alloy helical surface are time consuming and *** make the manufacturing processes more flexible and economical,the forward hot extrusion process is proposed to form the 4-lobe aluminum alloy helical surface *** this work,we implement both simulations and experiments to the forming process of the helical surface,of which the material is 6063 aluminum *** forward hot extrusion process is simulated with finite element method in *** on the simulation method,the influences of different extrusion parameters,such as extrusion temperature,extrusion speed and extrusion ratio,on the extrusion process are *** to the numerical simulation results,the optimal case is chosen to carry out the ***,the experimental results show that the surface is smooth;the toothed fill is full;the twist angle in the length direction is evenly distributed;the value of twist angle is roughly in line with the design angle,which is mainly due to the modified die structure,having a positive and significant effect on the increment of twist ***,the twist angle has an increase of about 76%,which verifies the modified die structure.

摘要：The design of non-noble metal heterogeneous catalyst with superior performance for selective hydrogenation or transfer hydrogenation of nitroarenes to amines is significant but ***,a single-atom Fe supported by nitrogen-doped carbon(Fe_(1)/N-C)catalyst is *** Fe_(1)/N-C sample shows superior performances for the selective hydrogenation and transfer hydrogenation of nitrobenzene to aniline at different *** functional theory(dFT)calculations show that the superior catalytic activity for the selective hydrogenation at lower temperatures could be attributed to the effective activation of the reactant and intermediates by the Fe_(1)/***,the excellent performance of Fe_(1)/N-C for the selective transfer hydrogenation could be attributed to that the reaction energy barrier for dehydrogenation of isopropanol can be overcome by elevated temperatures.

摘要：高分子常作为有机磷光剂的刚性基质抑制非辐射跃迁来获得室温磷光.然而,以往研究偏于强度高分子玻璃化转变温度和自由体积如何影响室温磷光,关于基质与磷光剂之间的电子耦合如何调控室温磷光却鲜有研究.本文尝试将-种基于芳香酮磷光剂的单体与其他四种不同的基质单体共聚来解决这样的问题,得到的共聚物展现具有基质依赖性的室温磷光效率:当基质与磷光剂的电子耦合逐渐增强时,室温磷光效率由最高的22%降低至0%,表明磷光剂的三线态能级与基质相近时,容易通过电子交换机制耗散三线态激发态能量.

摘要：Heavy-load transfer robots are widely used in automobile production and machinery manufacturing to improve production *** order to meet the needs of large billet transfer,a 4-dOF transfer robot is designed in this paper,which consists of parallel four-bar *** Jacobian matrix referring to the mapping matrix from the joint velocity to the operating space velocity of the transfer robot can be solved by the differential-vector *** mean value of the Jacobian matrix condition number in the workspace is used as the global performance index of the robot velocity and the optimization *** constraint condition is established based on the actual working *** the linkage length optimization is carried out to decrease the length of the linkage and to increase the global performance index of *** total length of robot rods is reduced by 6.12%.The global performance index of velocity is improved by 45.15%.Taking the optimized rod length as the mechanism parameter,the distribution of the motion space of the transfer robot is ***,the results show that the proposed method for establishing the Jacobian matrix of the lower-mobility robot and for the optimization of the rods based on the velocity global performance index is accurate and *** workspace distribution of the robot meets the design requirements.

摘要：In order to evaluate the efficiency of the automated storage/retrieval system(AS/rS)accurately,and compare different layouts of the AS/rS using mean travel time,under randomized storage conditions,an exact,geometry-based analytical model is *** model can be used to compute the expected single-command and dual-command travel time for a storage/retrieval(S/r)machine which can travel simultaneously horizontally and vertically as it moves along a storage *** rack may be either square in time or non square in ***,the alternative layouts of the AS/rS and travel-time models are *** with setting the I/O point at the left-lower corner of the rack,setting the I/O point at any point at the vertical edge can help enhance the efficiency of the AS/rS.

摘要：In order to improve the strength and corrosion resistance of CoCrNi medium entropy alloy,TiC strengthened CoCrNi medium entropy alloy(CoCrNi/(TiC)_(x)(x=0.1,0.2,0.4))was designed by addition of different amounts of *** effects of TiC content on the microstructure,mechanical properties,and corrosion resistance of the alloy were *** was found that the precipitation morphologies of TiC changed from lamellar eutectic to needle structure with the increase of TiC content,and finally formed mixed needled and bulk TiC *** appears as a dissolution−precipitation phenomenon in the CoCrNi alloy,which is important for the mechanical properties and corrosion resistance of the CoCrNi/(TiC)_(x) *** strength of alloy was enhanced obviously after the addition of *** compressive yield strength of CoCrNi/(TiC)_(0.4) alloy reached 746 MPa,much larger than that of the CoCrNi medium entropy alloy,108 ***,the addition of TiC was found to improve the corrosion resistance of CoCrNi medium entropy alloy in the salt solution.

摘要：目的:解决考虑模糊环境条件影响下的复杂机械产品并行拆卸路径规划问题,并给出成本和模糊时间最优的拆卸方案。创新点:建立混合模糊模型,引入三角模糊数表示拆卸工序加工时间,提高拆卸路径规划的环境适应性;采用并行加工方法,尽可能地提高生产资源利用效率,缩短加工时间和降低加工成本;使用混合编码方式,用同一条染色体表示拆卸工序和工位信息,简化模型表达和运算;在遗传算法中引入高斯变异方法,提高算法的收敛速度。方法:1.引入一个包含N个工位和L个零部件的拆卸序列规划问题,提出混合模糊拆卸模型实现对此问题的数学描述;2.采用包含高斯变异算子的遗传算法,对结果进行优化计算,以得到最短的模糊加工时间和加工成本;3.将本文所述方法的计算结果与快速搜索随机树算法的运行结果进行比较。结论:在算法分别迭代50次、100次和150次的情况下,本文所述方法得到的最优解均优于快速搜索随机树算法的解,并且运行时间均短于快速搜索随机树算法。