摘要：Recently, the g-C3N4-based heterojunctions have been widely investigated for their greatly enhanced photogenerated carrier separation efficiency. However, most studies are based on the study of g-C3N4 powders. In this study, a novel TiN/C3N4/CdS nanotube arrays core/shell structure is designed to improve the photoelectrochemical catalytic performance of the g-C3N4-based heterojunctions. Among them, TiN nanotube arrays do not respond to simulated solar light, and thus only serve as an excellently conductive nanotube arrays backbone for supporting g-C3N4/CdS heterojunctions. g-C3N4 prepared by simple liquid atomic layer deposition, which possesses appropriate energy band position, mainly acts as the electron acceptor to transport and separate electrons. Deposited CdS quantum dots obtained by successive ionic layer adsorption reaction can effectively absorb visible light and thus act as a light absorber. The TiN/C3N4/CdS nanotube arrays core/shell structure could be verified by X-ray diffractions, Raman spectra, scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy elemental mappings and X-ray photoelectron spectroscopy. Compared with TiN/C3N4 nanotube arrays, the TiN/C3N4/CdS samples greatly improve the photoelectrochemical performance, which can be evaluated by photoelectrochemical tests and photoelectrochemical catalytic degradation. Especially, the optimized photocurrent density of TiN/C3N4/CdS has almost 120 times improvement on TiN/C3N4 at 0 V bias under simulated sunlight, which can be ascribed to the effective expansion of the light absorption range and separation of electron-hole pairs.

摘要：An atomic layer deposition （ALD） method has been employed to synthesize Fe3O4/graphene and Ni/graphene composites. The structure and microwave absorbing properties of the as-prepared composites are investigated. The surfaces of graphene are densely covered by Fe3O4 or Ni nanoparticles with a narrow size distribution, and the magnetic nanoparticles are well distributed on each graphene sheet without significant conglomeration or large vacancies. The coated graphene materials exhibit remarkably improved electromagnetic （EM） absorption properties compared to the pristine graphene. The optimal reflection loss （RL） reaches -46.4 dB at 15.6 GHz with a thickness of only 1.4 mm for the Fe3O4/graphene composites obtained by applying 100 cycles of Fe2O3 deposition followed by a hydrogen reduction. The enhanced absorption ability arises from the effective impedance matching, multiple interfacial polarization and increased magnetic loss from the added magnetic constituents. Moreover, compared with other recently reported materials, the composites have a lower filling ratio and smaller coating thickness resulting in significantly increased EM absorption properties. This demonstrates that nanoscale surface modification of magnetic particles on graphene by ALD is a very promising way to design lightweight and high-efficiency microwave absorbers.

摘要：运用软件工程开发思想,参照美国国防部体系结构框架(Department of Defense Archifecture Framework,DoDAF)2.0顶层设计理念,设计提出面向蓝军领域的本体工程化构建方法,基于该方法对面向联合作战实验的蓝军本体构建进行实践检验。经验证,该方法合理可行,能够有效支撑蓝军领域本体模型构建,为后续蓝军知识图谱建设奠定基础。

摘要：跨学科项目式学习是培育学生核心素养、落实落地义务教育新课程方案和课程标准理念的有效方式。以“樱桃果蝇的绿色、高效防治”为依托,设计跨学科项目式学习课程,引领学生综合运用生物学、数学、工程学等多学科知识解决真实的生产生活问题,使其在探究与实践中激发科学志向,发展创新和实践能力,践行美丽中国建设者的责任担当。

摘要：为了提高接收天线系统的增益以及灵敏度,对于天线与射频前端组成的接收系统采用了一种有源集成接收天线的设计方案,从而省略了传统设计中的有源电路与微带天线之间的匹配网络.依照此方案,设计并实现了一个背馈结构的矩形微带天线与前级低噪声放大器电路的有源集成.矩形微带天线的馈电点与低噪声放大器的输入端通过金属探针相连,当天线在2.48 GHz谐振时,通过选择合适的馈电点位置,天线产生放大器设计所需的输入阻抗.有源集成背馈式接收天线工作于S波段,最终的测试结果显示了其优良的特性.

摘要：作为各大运营商的品牌场景,5G高铁场景覆盖方案成为网络建设的重中之重,以满足高铁用户多样化业务感知需求。从高铁沿线覆盖空洞问题出发,提出波束宽度均衡理论以适配不同站点的连续覆盖需求,同时研究基于8TR的3D智能高铁天线及波束宽度调整方法。采用所提出的创新覆盖方案后,试验线路信号覆盖平均提升3~4d B,近点弱覆盖区域信号覆盖提升5~7 d B,所提出的5G高铁沿线覆盖方案作为一种系统性方案,既可提升高铁线路容量与覆盖,又可解决站点差异性的问题。

摘要：核电站靠海水库修建的出水口构筑物,其结构尺寸受场地限制且需同时考虑地震及高潮位影响,抗震设防要求高,可供采取的措施有限,因此需对结构的形式、尺寸进行特别的考虑,充分挖掘现有结构的抗震潜力。本文结合实际工程,在满足结构尺寸要求的条件下对结构进行抗震设计分析,通过工程实施的验证,得到的结果完全能满足结构功能要求,并可对类似工程的设计与施工提出指导。

摘要：为了克服传统DTI可视化技术存在计算空间大、信息丢失等问题,提出一种基于Perfect Spatial Hashing稀疏数据压缩方法的高分辨率DTI纤维丛可视化方法.将流场可视化中的streamball表示改进为沿着积分曲线布局的可参数化混合元球体,并将这种参数化混合元球体表示规范为一个高分辨率的稀疏三维密度场;进而采用Perfect Spatial Hashing稀疏数据压缩方法压缩该密度场,在保持数据高精度的同时提供了数据的高效随机访问特性.实验结果表明,采用文中方法得到的可视化结果不仅能清晰地揭示组织结构的连通性,还能展示局部张量细节信息.用户只需简单地改变等值面参数就可实时观察可视化结果.

摘要：滑移门内把手是滑移门系统中一个重要的零部件,主要实现手动、电动开闭滑移门的功能,作为车门上的安全部件其需要兼顾把手自己的机械强度以及发生碰撞时的耐惯性要求。但传统滑移门把手设计过于单调,缺乏亮点,在目前国产汽车逐步走向高端国际化的背景下,对汽车内饰的多样化智能化提出了更多的需求,所以需结合使用场景进行开发创新。本文主要阐述了一种全新滑移门水晶发光把手在设计开发过程中,如何考虑水晶发光把手的空间结构设计,把手机械强度,耐惯性、双色注塑成型工艺以及子零件装配定位、异响防范等设计要点,给其他汽车工程师在开发类式创新型产品时提供了一种思路和参考,最后给出其重要作用和意义。

摘要：随着电子设计自动化(EDA)和计算机技术的发展,用软件手段实现硬件设计已成为电子设计领域的迫切需要,笔者在电子设计实践教学中运用软件工程方法,引入了现代EDA技术,结合设计实例分析探讨了其在实践教学中的优越性,旨在提高本科学生的创新能力,培养电子类宽口径复合型人才。