A new mixed integer program and extended look-ahead heuristic algorithm for the block relocation problem

This paper considers the block relocation problem (BRP), in which a set of identically-sized items is to be retrieved from a set of last-in-first-out (LIFO) stacks in a specific order using the fewest number of moves. The problem is encountered in the maritime container shipping industry and other industries where inventory is stored in stacks. After surveying the work done on the BRP, we introduce “BRP-III”—a new mathematical formulation for the BRP—and show that it has considerably fewer decision variables and better runtime performance than the other formulation in the literature. We then introduce a new look-ahead algorithm (LA-N) that is an extension of the algorithms from the literature and show that the new algorithm generally obtains better solutions than the other algorithms and has minimal CPU runtime.     

Phase volume and size effects on the terminal relaxation of ABS melts

The dynamical viscoelasticity of ABS melts with different particle size was investigated at various levels of rubbery phase contents. The effects of the rubber are more pronounced in the terminal zone: a transition from viscoelastic liquid to viscoelastic solid behavior was observed which can be interpreted as a physical gelation occurring at a critical rubbery phase content. This critical content resulted in being smaller in the case of smaller particles. A quantitative explanation of the experimental findings was proposed in terms of the average interparticle distance and overlapping of the chains grafted onto the neighboring rubber particles. The gel-like transition appeared to correspond to an approximately constant level of grafted chains overlapping.Presented in part at the Symposium Recent Developments in Structured Continua, Montreal (Canada), 26–28 May 1993.     

电源系统在车载中的应用以及设计

随着我国经济的发展,人文社会的进步.我们对能源的需求量越来越大,节能减排是我们首要任务.因此,在车载系统中电源系统功耗的减少也是我们解决能源问题的一个方法.在车载系统中设计一款稳定、高效、节能的电源系统.通过分析车载终端的功能模块供电系统,提出系统电源组成的设计方案,实现了各个系统电源的合理分配以及节能的目的.     

基于移动智能终端的便携式眼底图像检测仪

提出了一种便携式眼底图像检测系统,连接在移动智能设备上对眼底图像进行拍摄、存储、显示和解析。采用紧凑精密的光路结构开发了基于Android的图像处理与解析软件,并通过智能终端自带的远程消息发送软件,可将眼底图像远程传送给专业医生进行临床诊断。仿真结果表明,照明均匀性超过85%,杂散光在2%内。实验结果表明,该检测仪光学系统的视场为45°、工作距离为30 mm、总长度＜180 mm,可实现眼光焦度补偿范围为-10～+5 m-1,成像清晰,畸变＜6%。实现了对眼底检查的远程移动医疗。     

构建基于O2O模式的终端销售运营体系研究

本文先介绍了终端运营的现状,阐述了终端销售运营研究的背景和驱动力。然后提出了终端销售运营体系研究的方向,并从终端销售的产业链演进、多渠道协同、统一操盘能力、产业链生态4个方面进行了深入说明。最后展现了研究成果的实施效果。     

黑胸大蠊浓核病毒基因组末端序列测定与分析

利用构建的黑胸大蠊浓核病毒(PfDNV)全基因组重组质粒(PfDNV-pUC119)以及一系列完整缺失克隆,通过全自动测序方法完成了PfDNV两末端各728 bp 和730 bp 核苷酸序列的测定. 通过计算机软件分析发现,PfDNV 末端201nt为倒置重复序列,其中最末端122nt为回文序列,能形成典型的发夹结构. 并与同科其它病毒末端序列进行了核苷酸序列同源性比较.     

LTE终端语音解决方案现状及下一步演进

LTE时代终极终端语音解决方案VoLTE是目前业界研究的重点.对现有LTE终端的多种语音解决方案进行了详细的技术分析和比较,重点从终端角度探讨了承载在纯分组交换系统和IMS的VoLTE的技术优势和待解决问题,呈现了VoLTE技术作为LTE终端语音解决方案的技术特点和下一步演进趋势.     

配网自动化终端选取及实施问题分析

在承德地区配网自动化建设中,借鉴其主网RTU远方终端运行方式,将RTU终端概念引入复杂的配网环境中。在面对配网实现自动化过程中,对厂站自动化终端的选取进行了利弊分析。并针对实际应用中发现的问题进行探讨,寻求解决问题的办法。     

Synthesis of Unsymmetrical 1,3‐Diynes via Pd/Cu‐Catalyzed Cross‐Coupling of Terminal Alkynes at Room Temperature

A facile and practical synthetic route of unsymmetrical 1,3‐diynes via the PdCl/CuI catalyzed oxidative coupling of two different terminal alkynes has been developed by using 3‐(diphenylphosphino)propanoic acid as a ligand in the presence of oxygen. This system is suitable for not only aromatic alkynes but also heteroaromatic and aliphatic alkynes which were transformed into the corresponding unsymmetrical 1,3‐diynes in moderate to good yields at room temperature. Moreover, the unsymmetrical 1,3‐diynes were also obtained on a multi‐gram scale. Mechanistic studies suggest that oxygen plays a key role in the catalytic cycles.