摘要：This paper presents four different hybrid genetic algorithms for network design problem in closed loop supply chain. They are compared using a complete factorial experiment with two factors, viz. problem size and algorithm. Based on the significance of the factor “algorithm”, the best algorithm is identified using Duncan’s multiple range test. Then it is compared with a mathematical model in terms of total cost. It is found that the best hybrid genetic algorithm identified gives results on par with the mathematical model in statistical terms. So, the best algorithm out of four algorithm proposed in this paper is proved to be superior to all other algorithms for all sizes of problems and its performance is equal to that of the mathematical model for small size and medium size problems.

摘要：An enrolment projection model based on the Markov chain is developed for Apostolic Faith Secondary School, Akwa Ibom State, Nigeria. Six years of data (between 2008/2009-2013/2014 academic sessions) of student enrolment at the school were studied. The study reveals that the enrolments through various grades are not stable and orderly. The model is helpful for the school’s future planning in matters regarding secondary students’ enrolment.

摘要：This tutorial review summarizes recent progress in the research field of controlled/"living" radical polymerization (CLRP) from Soochow *** present paper gives a broad overview of the mechanism study and molecular design in *** mechanism study in CLRP aided by microwave,initiated by γ-radiation at low temperature,mediated by iron,in reversible addition-fragmentation chain transfer (RAFT) polymerization and the mechanism transfer between different CLRP processes are reviewed and *** molecular design in CLRP,especially in RAFT polymerization for mechanism study,and in achieving tailor-made functional polymers is studied and discussed in the later part.

摘要：Perfluorooctanoic acid(PFOA) or perfluorooctane sulphonate(PFOS) was one of the most prominent fluorosurfactants and applied widely in firefighting and daily chemical, etc. However, these surfactants have recently been identified as toxic and undegradability in the environment. Developing an efficient approach to environment-friendly fluorosurfactants is essential. A fluorocarbon branched chain strategy was adopted to develop/PFOS substitutes. A series of intermediates of novel branched fluorinated surfactants with CF_3 CF_2CF_2C(CF3)_2 group were synthesized from perfluoro-2-methyl-2-pentene. All the steps were mild, easy-handled and cheap. It is expected to be a very significant direction for the development of non-bioaccumulable alternatives of PFOA or PFOS.

摘要：Objective:To classify 21 new isolates of Trypanosoma cruai(***) according to the Discrete Typing Unit(DTU) which they belong to,as well as tune up a new pair of primers designed to detect the parasite in biological ***:Strains were isolated,DNA extracted,and classified by using three Polymerase chain Reactions(PCR).Subsequently this DNA was used along with other isolates of various biological samples,for a new PCR using primers ***,the amplified fragments were ***:It was observed the predominance of DTU i in Colombia,as well as the specificity of our primers for detection of ***,while no band was obtained when other species were ***:This work reveals the genetic variability of 21 new isolates of *** in *** primers confirmed their specificity for detecting the presence of ***.

摘要：由于屏幕图像的各向异性特点，使用传统的图像／视频编码算法不能得到理想的编码效率。该文提出一种双编码器方案，在保留HEVC（HighEfficiencyVideoCoding）对连续色调区域的优秀性能的同时，加入了从***—MarkovchainAlgorithm）SDK中提取出来的对非连续色调区域编码性能更优的字典一熵编码模块。两种编码器以宏块级自适应的方式有机融合，可适应不同的视频源特性。为了减少YUV4：4：4格式转换到YUV4：2：0对图像造成的失真，该文还提出了混合色度采样率的设计，可在保留传统色度子采样编解码器和其低码率低成本优势特性的前提下，有效提高编码效率。实验结果表明，该文提出的方案，比单纯使用HEVC的性能提高约10～30dB，其主观性能改善也非常明显。

摘要：The productivity of an organization is very much affected by non-value adding activity like logistics, which moves the resources from suppliers to factory, raw materials/semi-finished items within the factory and finished goods from factory to customers via a designated distribution channel called as forward logistics. In some cases, parts of the products such as automobiles, computers, cameras, mobile phones, washing machines, refrigerators, garments, footwear and empty glass bottles of beverages, etc. will be brought back to the factories as a product recovery strategy through reverse logistics network which is integrated in a sustainable closed loop supply chain network. So, it is highly essential to optimize the movement of the items in the reverse logistics network. This paper gives a comprehensive review of literature of the design of networks for the reverse logistics as well as for the reverse logistics coupled with forward logistics. The contributions of the researchers are classified into nine categories based on the methods used to design the logistics network.

摘要：This paper deals with the design of high power – low dimensions axial-flux permanent-magnet motor intended for trac-tion application. First, two motor configurations are analytically designed and compared using finite element calcula-tion. Then, the configuration yielding the best performances is integrated and modelled with the whole traction chain under MATLAB/SIMULINK environment in order to demonstrate the motor operation on a large speed band.

摘要：针对产品开发中任务分布的不合理会导致产品开发时间延长的问题,引入设计结构矩阵,运用Markov chain方法对耦合设计迭代过程进行分析,得到迭代过程的时间成本与设计结构矩阵中表示任务周期、返工概率的参数的关系,进而获得有利于缩短开发时间的任务布局方案的设计结构矩阵调整策略.以某照相机的开发过程为例,验证了该方法的有效性.

摘要：Mooring systems play an important role for semi-submersible rigs that drill in deepwater.A detailed analysis was carried out on the mooring of a semi-submersible rig that conducted a trial well drilling at a deepwater location in the South China Sea in *** rig was 30 years old and had a shallow platform with a designed maximum operating water depth of 457 *** the mooring analysis,a mooring design was given that requires upgrading of the rig’s original mooring *** upgrade included several innovations,such as installing eight larger anchors,*** the original anchors and inserting an additional 600 m of steel wires with the existing *** this was done to enhance the mooring capability of the rig in order for the rig to be held in position to conduct drilling at a water depth of 476 *** overall duration of the drilling was 50 days and the upgraded mooring system proved to be efficient in achieving the goal of keeping the rig stationary while it was drilling the trial well in the South China *** successful campaign demonstrates that an older semi-submersible rig can take on drilling in deep water after careful design and proper upgrading and modification to the original mooring system.