摘要：In contrast to heterogeneous network frameworks(e.g.,covalent organic frameworks and metal‐organic frameworks)and porous organic polymers,porous organic cages(POCs)are soluble molecules in common organic solvents that provide significant potential for homogeneous ***,we report a triphenylphosphine‐derived quasi‐porous organic cage(denoted as POC‐DICP)as an efficient organic molecular cage ligand for Rh/PPh_(3) system‐catalyzed homogeneous hydroformylation ***‐DICP not only displays enhanced hydroformylation selectivity(aldehyde selectivity as high as 97%and a linear‐to‐branch ratio as high as 1.89)but can also be recovered and reused via a simple precipitation method in homogeneous reaction *** speculate that the reason for the high activity and good selectivity is the favorable geometry(cone angle=123.88°)and electronic effect(P site is relatively electron‐deficient)of POC‐DICP,which were also demonstrated by density functional theory calculations and X‐ray absorption fine‐structure characterization.

摘要：The vacuum plume effects experimental system （PES） is the first experimental system designed to study the effects of vacuum plume in China. The main equipment, a vacuum chamber of 5.5 m in diameter and 12.8 m in length, and structure design of hinged door are described. The finite element method （FEM） is adopted to analyze the static strength and stability of the PES vacuum chamber. It is demonstrated that the static strength and stability are qualified. For the 5.5 m diameter vacuum chamber door, three design schemes are put forward. After comparisons are made, the single-axis-double-pin hinged door is selected. The FEM is applied to checking its static strength as well as distortions. The results show that the door’s distortion and displacement change mainly due to the gravity of the door which leads to its sinking. The calculated displacement is less than 7.8 mm, while the actual measurement is 5 mm. The single-axis-double-pin hinged door mechanism completely satisfies the design requirements. This innovative structure can be introduced as a reference for the design of large-scale hinged doors.

摘要：在移动互联网的飞速发展与智能手机等移动终端日趋普及的情况下,设计开发了基于移动端的基础化学原理实验在线学习与考试系统。该系统包括化学实验室安全教育与考试、实验基础理论学习、试题库资源、移动端在线考试、成绩管理和统计分析等五大功能。该系统的开发建设顺应了“互联网+教育”的发展趋势,有利于学生自主学习,节约考试资源。

摘要：为推动废水处理行业的绿色低碳转型,精确核算废水处理工艺的碳排放至关重要,其中电力消耗是主要的碳排放源。采用国际气候变化专门委员会推荐的排放因子法,对典型芯片废水处理工艺的碳排放进行了核算,并探讨了不同处理阶段的碳排放组成及其决定因素。结果表明,芯片废水处理工艺的碳排放量普遍高于城镇废水处理工艺。7种典型芯片废水处理工艺A~G的碳排放强度分别为2.20、2.32、2.85、2.58、2.72、3.69、2.39 kg CO_(2)e/m^(3)。其中,在碳排放强度差异较小的情况下,G工艺的碳排放量最低,仅为1.2×10^(4) kg CO_(2)e/d,直接甲烷、氧化亚氮、间接电耗和药耗排放量分别为3 309.3、 2 893.8、3 733.4和2 520.7 kg CO_(2)e/d,间接电耗占比最高,达30%。相比之下,G工艺平均减排10%,最高达35%。以广东省某电子工业企业5 200 m^(3)/d芯片废水处理工程为例,G工艺旨在有效应对氟化物及有机碳/氮处理挑战及碳排放控制问题,确保出水水质符合《地表水环境质量标准》(GB 3838-2002)Ⅲ类标准。此外,A、G工艺单位用地碳排放强度分别为0.71 kg CO_(2)e/m^(2)、1.93 kg CO_(2)e/m^(2),G工艺土地利用率和污水处理效率高。通过深入探究与分析后得出的结果,应用新的能源利用模式和工艺优化方法,在处理芯片废水的过程中,能够显著减少能源消耗,从而降低碳排放,有助于推动该行业朝着更加绿色、可持续的方向发展。

摘要：A series of novel pyrimidin-4（3H）-one hydroxamate derivatives was designed, synthesized and studied for their activities against histone deacetylases（HDACs）. The results indicate that all the compounds show HDACs inhibitiory activity. The antiproliferative activities of the compounds against HeLa and A549 cells were also investigated. The pharmacological results show compound 9g has potent activity in the enzymatic inhibition assay and cell-based assay.

摘要：大型卧式容器的铰链式大门机构在装配和长期使用过程中由于下沉变形会导致大门关不严,影响密封性能.针对某在建的大型真空羽流试验舱直径Φ5.5 m的大门机构,首次提出了一种新颖的单轴双销铰链式大门机构方案,并对该机构的转动机构、限转装置和大门法兰底部的弹性支撑装置进行了全新的设计和分析,并通过有限元分析对该大门机构的强度进行了校核.有限元分析结果表明,大门合位移变形主要由大门重力引起的y方向位移贡献;在大门法兰底部施加弹性支撑时,铰链机构与大门法兰连接处的两个应力集中范围缩小、量值降低,并能保证大门合位移小于10mm.该大门机构的强度和刚度满足设计要求,对同尺寸的大门设计有重要借鉴意义.

摘要：针对深水矢量水听器的结构耐压问题,推导外压球壳最大应力公式,分析同振式球形矢量水听器的材料和尺寸对其声学性能和耐压性能的影响。基于此,给出一种最小平均密度薄壁耐压球壳的设计方法。从典型深海工程材料中优选7075T6铝合金材料,设计、制作一型设计耐压深度3000 m的同振式球形矢量水听器。对该水听器耐压结构进行了有限元仿真,并对其灵敏度、指向性和耐压能力进行了测试。结果表明:该矢量水听器具有良好的余弦指向性,500 Hz处灵敏度为-188 dB,能够耐受37.5 MPa外压;最小平均密度薄壁耐压球壳的设计方法及工程样机设计方案是合理和可行的。

摘要：针对水下声学滑翔机样机研制对小尺寸、耐压复合同振式矢量水听器的迫切需求,设计面向水下滑翔机平台的耐压复合同振式矢量水听器。根据矢量水听器工作原理,对其声压通道和矢量通道进行声学设计;仿真分析压电陶瓷元件和薄壁铝合金壳体耐压特性,完成矢量水听器整体结构设计与制作;进行矢量水听器耐压能力及电声参数测试,将该水听器集成应用于水下声学滑翔机。在南海某海域开展海上试验,采集100~3000 Hz范围内水下声场信息,给出不同频点噪声级随时间的变化曲线,且得到了水面航船经过时不同频点的噪声级变化。结果表明,矢量水听器在1200 m深处可靠工作,设计的矢量水听器满足水下声学滑翔机样机研制应用需求。

摘要：航天器对接与捕获技术(Docking&capture technology,DCT)是实现航天器之间在轨连接、控制与分离,建立组合体间人员或资源交互的技术。对航天器对接与捕获技术的研究背景、发展历程、发展趋势、应用前景、技术内涵等内容进行了综述,首先从运载局限性催生对接技术发展、在轨服务需求爆发促进对接技术发展、空间碎片清理任务推动捕获技术发展等角度阐述了航天器对接与捕获技术的研究背景。从时间维度总结了该技术发展的三个历程,从技术途径角度概括了该技术的五个发展趋势。从在轨延寿、在轨手术、地外基建、轨道修正四个方面梳理了该技术的应用前景,提炼了该研究领域的八项关键技术。最后,给出了我国在该领域开展研究的方向和建议,为航天器在轨对接与捕获技术的未来研究提供参考。

摘要：如何改造规划能够更经济、合理且有效满足线路正常运行、运营使用需求是城市轨道交通发展面临的新问题。针对既有线路信号系统,结合国内各现行标准规范、线网规划及各线路实际运营状况分类,提出改造规划的方向及思路,为既有线路的信号系统改造规划提供借鉴及参考。