基于FPGA的通用分频器设计

本文介绍了一种能够完成半整数和各种占空比的奇/偶数和的通用的分频器设计.并给出了本设计在Altera公司的FLEX10K系列EPFIOKIOLC84-3型FPGA芯片中实现后的测试数据和设计硬件的测试结果,结果表明了设计的正确性和可行性.由于设计采用VHDL硬件描述语言实现,用户可以自行裁减和设置分频器的功能,所以有很广泛的应用价值.     

重水堆主热传输支管自动超声检查系统开发

开发一套CANDU型重水堆主热传输支管自动超声检查系统。利用常规超声探头实现相控阵超声检查的功能,实现现场自动采集数据、远程实时分析数据,检查精度达到±0.03 mm;同时,研制出专用的射线屏蔽装置,屏蔽率达到80%。     

基于eHMI的车外人机交互信任影响因素研究

目的 更好地发挥车外人机交互界面(eHMI)的潜在优势,研究车外人机交互过程中的信任影响机制。方法 首先基于自动化信任理论,提出感知可靠性、感知透明度、感知熟悉度、感知车辆性能、感知品牌信誉和感知主观倾向等6个车外人机交互信任影响因素,然后使用结构方程模型的方法对305名被调查者进行数据分析,由此建立车外人机交互信任影响因素的理论模型。结果 行人通过对eHMI信号感知而形成的信任能够影响对自动驾驶汽车的信任,行人对eHMI的信任一定程度上转移成为行人对车辆的信任,eHMI的辅助作用得到体现。强调了eHMI设计中感知可靠性的重要性,这能够被熟悉度、透明度和品牌信誉所影响。同时,行人的主观倾向和对车辆性能的感知也是影响信任水平的重要因素。结论 研究结果为车外人机交互信任对于自动驾驶汽车在未来道路上使用的重要性提供了证据,同时也为eHMI的设计提供了参考和建议。     

多层重力-侧力系统可分组合结构体系力学性能分析

针对装配式组合结构的发展需求,提出了一种多层重力-侧力系统可分组合结构体系,通过梁端铰接实现了结构的竖向承重系统与水平抗侧力系统的分离,提升了装配式组合结构的标准化程度.根据该结构体系的布置方案,设计并完成了3个大比例体系试验,与传统刚接组合框架对比,分析了新型结构体系在竖向楼面荷载和水平滞回荷载作用下的力学性能,对两种结构体系开展了抗震性能评价.利用通用有限元软件MSC.Marc建立了新型结构体系的有限元模型,通过与试验结果对照分析了节点建模方式对计算结果的影响.研究结果表明,新型结构体系在水平地震作用下的安全裕度高于传统刚接组合框架,新型结构体系的节点表现出显著半刚性,其对结构竖向承载刚度和侧向刚度均有明显影响.     

Topotactic Transition: A Promising Opportunity for Creating New Oxides

Topotactic transition is a structural phase change in a matrix crystal lattice mediated by the ordered loss/gain and rearrangement of atoms, leading to unusual coordination environments and metal atoms with rare valent states. As early as in 1990s, low temperature hydride reduction is utilized to realize the topotactic transition. Since then, topological transformations are developed via multiple approaches. Especially, the recent discovery of the Ni-based superconductivity in infinite-layer nickelates has greatly boosted the topotactic transition mean to synthesizing new oxides for exploring exotic functional properties. In this review, a detailed and generalized introduction is provided to oxygen-related topotactic transition. The main body of the review includes four parts: the structure-facilitated effects, the mechanism of the topotactic transition, some examples of topotactic transition methods adopted in different metal oxides (V, Mn, Fe, Co, Ni) and the related applications. This study is to provide timely and thorough strategies to successfully realize topotactic transitions for researchers who are eager to create new oxide phases or new oxide materials with desired functions.     

浅谈特种设备检验管理系统的架构设计与实现

本文基于J2EE、XML、B/S结构等技术手段,结合特种设备监督检验工作的特点,构建特种设备检验检测工作管理和日常业务管理系统,详细介绍了该系统的主要业务功能、技术特点、物理架构的实现及现实意义.     

Finely Crafted 3D Electrodes for Dendrite‐Free and High‐Performance Flexible Fiber‐Shaped Zn–Co Batteries

Rechargeable aqueous Zn‐based batteries, benefiting from their good reliability, low cost, high energy/power densities, and ecofriendliness, show great potential in energy storage systems. However, the poor cycling performance due to the formation of Zn dendrites greatly hinders their practical applications. In this work, a trilayer 3D CC‐ZnO@C‐Zn anode is obtained by in situ growing ZIFs (zeolitic‐imidazolate frameworks) derived ZnO@C core–shell nanorods on carbon cloth followed by Zn deposition, which exhibits excellent antidendrite performance. Using CC‐ZnO@C‐Zn as the anode and a branch‐like Co(CO₃)_0.5(OH)_x·0.11H₂O@CoMoO₄ (CC‐CCH@CMO) as the cathode, a Zn–Co battery is rationally designed, displaying excellent energy/power densities (235 Wh kg^?1, 12.6 kW kg^?1) and remarkable cycling performance (71.1% after 5000 cycles). Impressively, when using a gel electrolyte, a highly customizable, fiber‐shaped flexible all‐solid‐state Zn–Co battery is assembled for the first time, which presents a high energy density of 4.6 mWh cm^?3, peak power density of 0.42 W cm^?3, and long durability (82% capacity retention after 1600 cycles) as well as excellent flexibility. The unique 3D electrode design in this study provides a novel approach to achieve high‐performance Zn‐based batteries, showing promising applications in flexible and portable energy‐storage systems.     

Synergistic Effect of Multi-Walled Carbon Nanotubes and Ladder-Type Conjugated Polymers on the Performance of N-Type Organic Electrochemical Transistors

Organic electrochemical transistors (OECTs) have the potential to revolutionize the field of organic bioelectronics. To date, most of the reported OECTs include p-type (semi-)conducting polymers as the channel material, while n-type OECTs are yet at an early stage of development, with the best performing electron-transporting materials still suffering from low transconductance, low electron mobility, and slow response time. Here, the high electrical conductivity of multi-walled carbon nanotubes (MWCNTs) and the large volumetric capacitance of the ladder-type π-conjugated redox polymer poly(benzimidazobenzophenanthroline) (BBL) are leveraged to develop n-type OECTs with record-high performance. It is demonstrated that the use of MWCNTs enhances the electron mobility by more than one order of magnitude, yielding fast transistor transient response (down to 15 ms) and high μC* (electron mobility × volumetric capacitance) of about 1 F cm^?1 V^?1 s^?1. This enables the development of complementary inverters with a voltage gain of >16 and a large worst-case noise margin at a supply voltage of <0.6 V, while consuming less than 1 µW of power.     

Highly Efficient Ternary All-Polymer Solar Cells with Enhanced Stability

Developing organic solar cells (OSCs) based on a ternary active layer is one of the most effective approaches to maximize light harvesting and improve their photovoltaic performance. However, this strategy meets very limited success in all-polymer solar cells (all-PSCs) due to the scarcity of narrow bandgap polymer acceptors and the challenge of morphology optimization. In fact, the power conversion efficiencies (PCEs) of ternary all-PSCs even lag behind binary all-PSCs. Herein, highly efficient ternary all-PSCs are realized based on an ultranarrow bandgap (ultra-NBG) polymer acceptor DCNBT-TPC, a medium bandgap polymer donor PTB7-Th, and a wide bandgap polymer donor PBDB-T. The optimized ternary all-PSCs yield an excellent PCE of 12.1% with a remarkable short-circuit current density of 21.9 mA cm⁻². In fact, this PCE is the highest value reported for ternary all-PSCs and is much higher than those of the corresponding binary all-PSCs. Moreover, the optimized ternary all-PSCs show a photostability with ≈ 68% of the initial PCE retained after 400 h illumination, which is more stable than the binary all-PSCs. This work demonstrates that the utilization of a ternary all-polymer system based on ultra-NBG polymer acceptor blended with compatible polymer donors is an effective strategy to advance the field of all-PSCs.     

卡拉胶寡糖的研究进展

卡拉胶具有抗氧化、抗凝血、抗病毒等多种生理活性,但因分子量过大而影响其溶解性和吸收性,从而使其在生物医药领域的应用受到限制。相对卡拉胶而言,卡拉胶寡糖分子量小、溶解性好,稳定性和安全性有所改善,在生物医药领域表现出诱人的应用前景。综述了卡拉胶寡糖的研究进展,涉及卡拉胶寡糖的制备方法、分离和分析方法、生物学活性等方面。