摘要：分析了限制超长距无中继传输通信的关键性因素,主要包括功率因素、色散因素和光信噪比因素等,并逐一对克服这些限制因素的相关技术进行了介绍,主要包括掺铒光纤放大器、色散补偿、前向纠错(FEC)和非线性抑制等技术,然后结合实际产品在电力系统中的应用进行了详细说明,最后总结出了超长距无中继传输通信系统设计的基本原则。

摘要：The Cheng-Lan railway links Chengdu, a central city in Southwestern China, and Lanzhou, a central city in Northwestern China. The railway passes through the Longmenshan fault zone (Wenchuan earthquake happened there on May 12, 2008), Minjiang fault zone, and Dongkunlun fault zone, which are all active. It runs over the yangtze River and the Yellow River, and crosses high mountains and deep valleys. There exists, along the railway's alignment, different kinds of strata of hard granite and soft, weak metamorphic rocks such as carbonaceous slate, schist, and phyllite. It is, therefore, a key issue for such an infrastructure construction to assess the engineering geological conditions and risks, so as to mitigate or avoid possible georisks and to offer optional designs. Geological survey and georisk assessment along the railway corridor are carried out. Special attention is given to active faults, earthquakes and seismic zones. Based on these, discussions about geological aspects for route selection of the railway are conducted and countermeasures for georisk control are proposed accordingly. Main conclusions are achieved as follows: (1) Geohazards such as landslides, rockfalls and debries flows dominate both the route selection of the railway and the engineering structures (e.g., tunnels or bridges) adopted; (2) Tunnel has been proved to be an excellent structure for linear engineering in geologically active area; and (3) In the case where avoiding is impractical, necessary protection measures should be taken to engineering slopes in high earthquake intensity areas, especially the area with earthquake of Ms. 8 or greater.

摘要：介绍了遥测、遥控系统中远程数据通信的基本模式和一般的系统组成结构;论述了有线电话MODEM的基本工作原理和常用工作方式;给出了遥测终端机中的单片机与MODEM的接口方法和AT指令集的用法及通信程序设计。

摘要：运维技术是地球轨道卫星、深空探测器、高超声速飞行器、地外天体巡视器等空间无人系统实现安全可靠稳定运行的重要保障.针对现有远程集中运维方式存在的执行效率偏低、精准程度不高等问题,本文提出了一种支持隐私保护的分布式云边协同运维机制,为解决“资源配置不充分、先验知识不完备、信息交互不安全”等挑战提供了一种有效途径.在此基础上,同时关注“数据、模型与算法”人工智能技术的三大核心要素,重点针对数据增强、状态监测、异常检测、故障诊断、健康评估、寿命预测等空间无人系统智能精准运维6项关键核心技术的研究现状与应用情况进行了汇总与梳理.最后,结合未来航天型号任务需求以及人工智能技术发展态势,对空间无人系统智能精准运维技术未来可能的发展趋势进行了分析与展望.

摘要：In this study,a high impact resistant multi-layered composite consisting of continuous carbon fibre/nylon(CCF)and short carbon fibre/nylon(SCF)layers is developed via 3D printing *** effect of CCF/SCF layers configuration on the impact resistance is investigated by low-velocity impact test,and the impact failure mechanism of the 3D printed composites is explored by microscopic observations and finite element(FE)simulation *** results show that the 3D printed multi-layered composite with SCF layers distributed in the middle(HFA)exhibits higher impact resistant performance than the specimens with alternating SCF/CCF layers(HFB)and CCF layers distributed in the middle(HFC).The effect of CCF/SCF layers proportion on the impact performance is also studied by FE simulation,and the results show that the specimen with a CCF/SCF proportion of 7.0 exhibits the highest impact strength.

摘要：采用激光粉末床熔融增材制造的NiTi形状记忆合金普遍存在延展性低、缺陷多、形状记忆性能调控困难等问题。针对此,通过在近等原子比NiTi合金粉末中加入质量分数为1%的ZrH_(2)粉末,形成NiTi/Zr金属基复合材料,以改善NiTi合金的成形性和力学性能,并通过工艺参数有效调控NiTi合金的相变性能。结果表明:Zr掺杂在合适的成形参数条件下有效抑制了球化现象,从而减少了未熔合缺陷。同时分析了Zr掺杂NiTi形状记忆复合材料的显微组织。结果表明:激光工艺参数能够改变Zr在NiTi基体中的状态,形成Zr单质、固溶体、析出相等不同显微组织。示差扫描量热仪和拉伸实验表明:Zr掺杂结合不同的工艺参数能够实现形状记忆性能调控,并在不显著改变弹性模量的前提下同时提高材料的抗拉强度和断裂韧性。

摘要：A systemic investigation was done on the chemistry and crystal structure of boundary phases in sintered Ce9Nd21FebalB1 （wt%） magnets. Ce2Fe14B is believed to be more soluble in the rare-earth （RE）-rich liquid phase during the sintering process. Thus, the grain size and oxygen content were controlled via low-temperature sintering, resulting in high coercivity and maximum energy products. In addition, Ce formed massive agglomerations at the triple-point junctions, as confirmed by elemental mapping results. Transmission electron micros- copy （TEM） images indicated the presence of （Ce,Nd）Ox phases at grain boundaries. By controlling the composition and optimizing the preparation process, we successfully obtained Ce9Nd21FebalBx sintered magnets; the prepared magnets exhibited a residual induction, coerciv- ity, and energy product of 1.353 T, 759 kA/m, and 342 kJ/m3, respectively.

摘要：研究考虑延时效应和记忆效应的供应链广告策略问题,建立泛函微分方程以刻画广告延时和记忆双重效应对产品品牌信誉变化的影响,运用微分对策理论给出制造商和零售商在分散式决策和集中式决策下的最优广告投入水平、广告排期以及相应的产品品牌信誉,并对不同决策机制下供应链成员的均衡策略进行比较分析.研究表明:集中式决策能激励制造商和零售商的广告投入;延时效应与记忆效应分别影响供应链成员广告时序策略与广告排期策略的制定,同时,还会影响供应链决策机制的选择.

摘要：厘清研究生课程体系构建中的矩阵关系是提升研究生培养质量的重要举措。风景园林专业学位在改革试点中应通过对原有课程体系、就业状况的调研,分析判定风景园林新工科研究生课程体系特征,体现工程学科新兴、新型等“新”的特点。通过梳理课程体系与风景园林研究领域、课程导向、能力培养和不同社会需求之间的关系矩阵,依据学术研究型、复合应用型、设计实践型等三类风景园林研究生培养方向,重塑风景园林研究生课程关联矩阵模块。强调对风景园林研究生综合能力的培养,构建农林院校特色的风景园林新工科研究生课程体系关联矩阵,并探索多学科交叉融合的人才培养模式。

摘要：为减少纺织品水洗试验过程中用水量,有效降低漂脱废水中化学需氧量、阴离子表面活性剂和浊度等污染物数值,研发一种基于絮凝超滤技术的漂脱废水处理技术,并设计漂脱废水处理装置。探究絮凝剂投加量、沉淀时间以及臭氧浓度对洗衣废水处理效果的影响。结果表明,絮凝剂投加量170mg/L、沉淀时间25min以及臭氧浓度70mg/L时洗衣废水的处理效果最佳,化学需氧量、阴离子表面活性剂和浊度去除率分别可达83.0%、86.2%和87.9%。进一步于絮凝沉淀后联用管式聚偏二氟乙烯超滤膜处理,可滤除细小悬浮颗粒和有机物小分子物质,使得化学需氧量、阴离子表面活性剂和浊度去除率提升至95.4%、96.5%和96.8%。处理后的漂脱废水硬度为0.6mmol/L,满足国标水洗试验用水标准,可重新回流洗衣机内进行水洗试验。