摘要：A convenient and scalable synthesis of 1-amino-5-cyanonaphthalene was described.

摘要：友联红河特大桥为宁夏黄土地区上的一座公路桥梁,桥梁全长为2161 m,其中主桥长为1152 m,为两联主跨分别为118 m、140 m的连续刚构桥,最大联长为720 m,最大墩高达102 m。通过对该桥主桥桥型、跨径的比选分析,确定施工图最终设计方案。桥型方面,对预应力混凝土连续刚构、钢腹板预应力混凝土连续刚构及矮塔斜拉桥进行比选分析;跨径组合方面,结合桥梁布跨限制因素,对尽可能对存在的跨径组合方式进行了比选,以此确保本桥在桥型方案与跨径组合上为最佳方案。此类大跨、长联、高墩桥梁在我国西北黄土地区较为多见,相关研究成果可为同类工程提供参考。

摘要：针对传统特征提取方法极易造成信号丢失等问题,提出了将非线性特征中的排列熵引入运动想象特征提取,充分提取脑电的非线性特征。首先,对脑电信号进行预处理,去除杂波并保留脑电的有效信息;随后将预处理的脑电数据输入到排列熵中进行特征提取;使用二分类效果较好的支持向量机为分类器。将方法在脑电大赛数据集上进行验证,实验证明使用排列熵后,二分类的平均分类准确率能够达到90%,分类准确率较传统非线性特征有明显提升,排列熵能更好地进行脑电信号的特征提取。

摘要：快速的城镇化发展导致土地利用的矛盾进一步加深,引发了大量居民自下而上、自发性的行为活动,并随之形成诸多非正规性空间,成为目前社区更新工作中的难点。因此,文章从非正规性空间的视角出发,总结城市社区中非正规性空间的基本特征、使用模式、空间特性及内在逻辑等,结合南昌市省府社区实例,提出原址保留、功能复合、公众参与、分时控制等改造策略,以期为后续的社区营造与更新工作提供参考。

摘要：针对大跨度双曲桁架拱钢闸门结构的优化设计,采用拉丁超立方随机抽样方法建立试验抽样点,通过对抽样点的训练建立人工神经网络(ANN)预测模型;同时协同遗传算法(GA)的全局搜索能力,基于ANN模型构造相应的适应度函数,提出了一种ANN-GA协同优化的结构优化模型,并对某拟建60 m大跨度双曲桁架拱钢闸门关键构件进行结构优化设计。结果表明,ANN模型可有效应用于结构尺寸与闸门总质量及最大折算应力的非线性建模,训练后的ANN-GA模型可根据结构尺寸准确预测该结构尺寸下所对应的闸门总质量及最大应力值;通过建立基于ANN模型构建的适应度函数,GA可实现在ANN模型预测的基础上快速全局寻优并快速收敛,基于ANN-GA的协同优化方法对于闸门结构尺寸优化切实有效。研究成果可为闸门结构优化设计提供参考。

摘要：Sour water contains ammonia,carbon dioxide,and hydrogen sulfides,producing from oil refining,coking,and coal *** reduce the energy consumption in sour water stripping,a novel process is proposed which integrates with the bottom flashing mechanical vapor recompression heat pump(MVRHP)for treating such ***,Aspen PlusTM as a powerful set of chemical process simulation software is utilized to investigate the economy and feasibility of the novel *** of the results of two process simulations,it can be seen that it is possible to reduce the total annual cost by nearly 45%to adopt the novel process,despite the capital investment increase 45%more than the conventional ***,the provided conceptual design will play a guiding role in the industrialization of the process.

摘要：橡胶密封垫是盾构隧道接缝防水的核心结构,随着盾构隧道直径和设计水压的增大,双道密封垫模式已逐渐成为盾构隧道主流的防水设计方案。为探究双道密封垫相较于单道密封垫防水增强的机理,分别针对无间隙水压作用的常规工况和有间隙水压作用的特殊工况开展双道密封垫防水试验,记录中心腔及内水腔的水压时程曲线,分析得到2种情形下防水增强的主导因素。研究结果表明:在黏滞阻力的作用下,压力水从中心腔流入内水腔产生的压降是常规工况下双道密封垫防水增强的主要影响因素。压缩状态下密封垫的孔隙率越小,黏滞阻力压降效应越显著。通过引入孔隙度影响系数,提出了基于多孔介质渗流理论的黏滞阻力压降效应计算方法,并给出了孔隙率、流体流速、多孔介质平均粒子直径3个关键参数的获取方式。在间隙水压的反作用下,外道密封垫产生附加接触应力是特殊工况下外道密封垫防水增强的主要影响因素。密封垫的压缩程度越大,间隙水压作用下的防水增强效应越显著。借助压密率指标评价密封垫的等效泊松比,提出了间隙水压作用下防水增强能力的计算方法。研究探明了黏滞阻力和间隙水压作用对于双道密封垫的防水增强机理,并给出了2种增强效应的计算方法,为双道密封垫防水设计提供了参考。

摘要：为解决传统多线激光雷达以固定角度分辨率扫描导致远距目标探测空间分辨率变低的问题,文中提出一种双光源对称布置的8线激光雷达扫描系统。运用光线矢量法系统研究了旋转反射镜和光源参数与光束扫描轨迹的规律,结合激光雷达方程优化设计8线激光雷达整机参数。通过严格计算激光经不同倾角的反射镜旋转扫描的光束轨迹,在八面反射镜两侧特定位置对称布置两个光源进行分时发光探测实现具有高空间分辨率的八面反射镜旋转扫描系统。矢量计算结果表明,对距离100 m的人体在正前方有两条扫描探测光束,人体在侧向和边缘处仍有3条扫描探测光束,说明所提八面反射镜旋转扫描系统能更有效利用扫描光束探测远距离目标,优于Velodyne 64线激光雷达。

摘要：In the process of the design of heat exchangers,it is difficult to establish the factors governing the optimal points of the design objective functions due to the contradictions and uncertainties of the design *** variation of fluid properties is one of the main factors causing this type of *** design methods have not completely solved these *** the present work,based on the logarithmic mean temperature difference,a new heat exchanger design method(called the segmented design method) is proposed which takes into account the variation of fluid properties with respect to the *** this method,the whole heat exchanger is first divided into several *** by applying the principle of the conservation of energy and taking into account the initial conditions as well as the connecting conditions of the adjacent segments,the inlet and outlet temperatures of each segment are ***,the application of the logarithmic mean temperature difference method on each segment defines the heat transfer area.

摘要：In underwater applications of contactless power transmission(CLPT) systems,high pressure and noncoaxial operations will change the parameters of electromagnetic(EM) *** a result,the system will divert from its optimum *** a reluctance modeling method,we investigated the gap effects on the EM coupler in deep-sea *** and measurements were performed to analyze the influence of high pressure and noncoaxial alignments on the *** was shown that it is useful to set a relatively large gap between cores to reduce the influence of *** were carried out to verify the transferring capacity of the designed coupler and system for a fixed *** results showed that an EM coupler with a large gap can serve a stable and efficient power transmission for the CLPT *** designed system can transfer more than 400 W electrical power with a 2-mm gap in the EM coupler,and the efficiency was up to 90% coaxially and 87% non-coaxially in 40 MPa salt ***,a mechanical layout of a 400 W EM coupler for the underwater application in 4000-m deep sea was proposed.