微波接力组网的节点再优化研究

为进一步完善常规方法构建的微波接力网组网拓扑,提出了一种基于最优链路集的网络节点再优化方法。该方法综合考虑节点吸引系数、链路衰落概率、节点通信冗余等因素,借助网络拓扑优化的思想,采用遗传算法构造了微波接力网的最优链路集;以节点在该集合中的度为依据,通过对节点的合理排序,以部分用户节点代替非必要的干线节点,完善了组网拓扑。在修改链路和节点价值集后,该方法还可解决其他网络干线、中继节点的选择问题。     

开放科学及建构的制度逻辑

科学与技术是两种不同的制度模式,前者属于科学共和国"Republic of Science",后者属于技术王国"Realm of Technology",两者具有天生的互补性。开放科学作为一种非市场化的激励制度,提出一套基于优先权的报酬体制,强调在知识产权保护前提下追求创新知识社会福利的最大化,对于催生高质量的研究和创新(Research&Innovation)至关重要。本文在阐述开放科学起源、发展与理论内涵的基础上,重点从公共资助、累积创新、知识产权保护和知识分工四个方面,深入探究了开放科学建构的制度逻辑。     

Polycaprolactone Grafting of Cellulose Nanocrystals in Ionic Liquid[BMIM]CI

A polycaprolactone-grafted cellulose nanocrystal(PCL-g-CN) was prepared in ionic liquid and characterized by Fourier transform infrared spectrum(FT-IR),X-ray diffraction(XRD),and transmission electron microscopy(TEM).A peak assigned to the carbonyl group appears at 1 730 cm~(-1) in the FT-IR of PCL-g-CN,which confirms that the grafting reaction is successfully completed.The morphologies of PCL-g-CNs still maintain rod-like structure according to the TEM images.XRD results show that the crystal type of the PCL-g-CNs changed from cellulose Ⅰ to cellulose Ⅱ.The reasons for crystal transition of CNs turn out to be combined effects of anion and cation in ionic liquid with CNs.     

Collaborative Project Management: A Systemic Approach to Heavy Equipment Manufacturing Project Management

Quite often over the last decade, heavy equipment manufacturers are trying to improve their project management performance with the use of effective project management methods. However, the challenges encountered aren’t isolated problems and a systemic approach is required. This paper exemplifies how a systemic approach can be applied to heavy equipment manufacturing project (HEMP) management, through of a multifaceted vision. The findings present in the paper are based on a two-year case study in a metallurgic equipment manufacturing enterprise in China. Based on the analysis of HEMP management problems and the contributions on systemic approach application in project management, the paper enriches existing theory by: (1) interpreting the HEMP management system with the top-down disassembly method; (2) developing the collaborative project management approach with a systems view highlighting the project characteristics management and inter-departmental collaboration; (3) making suggestions for systemic approach application in project management. For practitioners and researchers, the findings are particularly meaningful for manufacturing project management and systemic approach application.     

沟道地貌自动提取技术下的贺家川镇沟道整治研究

选取陕北黄土高原地区沟壑地貌典型的神木县贺家川镇作为研究区域,从沟道地貌的空间形态特征和沟道整治的坡度组合思想着手,以DEM地貌信息自动提取为技术支撑,绘制出沟道地貌特征区域分布图和沟道整治潜力区域分布图,定量化掌握研究区沟道地貌的空间分布和面积情况,并针对不同地貌类型进行沟道整治模式探讨。     

重熔过共晶Fe-C-B合金初生Fe2B的凝固遗传及消除

通过重熔和施加脉冲电流,研究了过共晶Fe-C-B合金凝固组织中初生Fe2B的遗传性和消除方法.当不施加电脉冲时,重熔难以有效消除过共晶Fe-C-B合金初生Fe2B的凝固遗传性.重熔温度较低时施加电脉冲影响凝固组织中初生Fe2B的空间分布但不改变其长杆状形态.提高重熔温度并施加电脉冲能消除凝固组织遗传的影响,使Fe2B由长杆状转变为颗粒状,并明显减少Fe2B的析出.     

做好求职这道选择题不容易

每当到了求职的黄金季节,看着应届毕业生在学校窜进窜出,脸上写满焦虑,不禁窃喜自己毕业时求职之易,又疑惑当下研究生求职真的难干上青天吗?     

基于结构化模型驱动的稳控装置动作模拟仿真方法

提出了一种基于结构化模型驱动的稳控装置动作模拟仿真方法.通过对稳控装置模型的结构化,将其稳控策略组织为四元表形式(即故障、运行方式、潮流水平和控制策略),并将其控制策略分解为控制方式、控制量、控制量实施原则、控制对象队列和约束5个基本元素,在此基础上归纳出直接型、顺序型、循环型和最优型四种基本的控制策略结构化模型.进一...     

毕业生如何尽快实现心理断乳

近来,不时听到毕业生抱怨工作后遭遇到不公平待遇,例如与老员工同工不同酬、超负荷工作、打杂跑腿的琐碎事务缠身等.有些研究生进入科研单位工作后抱怨升职慢、工作职责多、终日为学术带头人打工等.     

毕节地区农业科学研究所图书资料室的现状及发展对策

分析了毕节地区农业科学研究所图书资料室的现状和存在的问题,从图书资料室的馆藏文献、网络化、数据库、服务体系及人才队伍建设等方面提出了发展对策。