无线电测控装备互调分析方法研究

在大型试验、演练中,靶场多台大型测控装备分别布设在陆基和海基不同站点,各装备相对于被测控目标的方位、俯仰不同,为达到合理布站、更好地完成测控任务,需要对装备进行合理的组网和互调分析。对互调理论应用于靶场试验中的方法进行了分析,对频率分配、装备布站、电磁兼容性等进行了研究,给出了计算模型和参数取值原则。     

基于SAA7130HL的视频采集卡设计

介绍了PHILIPS公司的第五代"精显芯片"SAA7130 HL的主要功能及性能特点,提出了一种基于SAA7130的视频采集卡设计方案,并详细说明了该采集卡的硬件框图和软件程序设计.实际的测试和使用证明了该采集卡的稳定性和可靠性.     

边缘检测算子在汽车牌照区域检测中的应用

本文介绍了常用的几种边缘检测算子,不同的微分算子对不同边缘检测的敏感程度是不同的,因此对不同类型的边缘提取,应该采用对此类边缘敏感的算子进行边缘提取.针对车辆牌照自动识别,通过Matlab6.5进行了仿真研究,并比较和分析了这些算子的特点和作用,从中选出了合适的方法.     

激光防护塑料材料的研制

对激光吸收剂IR10 60、5 3 0、5 80的激光吸收进行了比较,并确定其在材料中的比例。以聚碳酸酯为基材,搀杂激光吸收剂IR10 60、5 3 0、5 80制备了防波长为5 3 0nm和10 60nm激光、眩光的激光防护材料,并对其光学密度、抗激光能量损伤、可见光透过率和物理性能进行了测试,分析了激光吸收剂IRl0 60、5 3 0、5 80在材料中所占比例对其力学性能的影响。结果表明激光吸收剂的加入能提高材料的抗冲击强度。且比例的多少对材料的力学性能没明显影响,所制得的激光防护材料完全可以满足防激光、眩光的要求。     

Ultrahigh Energy Storage Capacitors Based on Freestanding Single-Crystalline Antiferroelectric Membrane/PVDF Composites

Inorganic/organic dielectric composites are very attractive for high energy density electrostatic capacitors. Usually, linear dielectric and ferroelectric materials are chosen as inorganic fillers to improve energy storage performance. Antiferroelectric (AFE) materials, especially single-crystalline AFE oxides, have relatively high efficiency and higher density than linear dielectrics or ferroelectrics. However, adding single-crystalline AFE oxides into polymers to construct composite with improved energy storage performance remains elusive. In this study, high-quality freestanding single-crystalline PbZrO₃ membranes are obtained by a water-soluble sacrificial layer method. They exhibit classic AFE behavior and then 2D–2D type PbZrO₃/PVDF composites with the different film thicknesses of PbZrO₃ (0.1-0.4 µm) is constructed. Their dielectric properties and polarization response improve significantly as compared to pure PVDF and are optimized in the PbZrO₃(0.3 µm)/PVDF composite. Consequently, a record-high energy density of 43.3 J cm⁻³ is achieved at a large breakdown strength of 750 MV m⁻¹. Phase-field simulation indicates that inserting PbZrO₃ membranes effectively reduces the breakdown path. Single-crystalline AFE oxide membranes will be useful fillers for composite-based high-power capacitors.     

Soft Robotic-Adapted Multimodal Sensors Derived from Entirely Intrinsic Self-Healing and Stretchable Cross-Linked Networks

Flexible sensing technologies that play a pivotal role in endowing robots with detection capabilities and monitoring their motions are impulsively desired for intelligent robotics systems. However, integrating and constructing reliable and sustainable flexible sensors with multifunctionality for robots remains an everlasting challenge. Herein, an entirely intrinsic self-healing, stretchable, and attachable multimodal sensor is developed that can be conformally integrated with soft robots to identify diverse signals. The dynamic bonds cross-linked networks including the insulating polymer and conductive hydrogel with good comprehensive performances are designed to fabricate the sensor with prolonged lifespan and improved reliability. Benefiting from the self-adhesiveness of the hydrogel, strong interfacial bonding can be formed on various surfaces, which promotes the conformable integration of the sensor with robots. Due to the ionic transportation mechanism, the sensor can detect strain and temperature based on piezoresistive and thermoresistive effect, respectively. Moreover, the sensor can work in triboelectric mode to achieve self-powered sensing. Various information can be identified from the electrical signals generated by the sensor, including hand gestures, soft robot crawling motions, a message of code, the temperature of objects, and the type of materials, holding great promise in the fields of environmental detection, wearable devices, human-machine interfacing, and robotics.     

Integrated Configuration Design Strategy Via Cathode-Gel Electrolyte With Forged Solid Electrolyte Interface Toward Advanced Lithium-Sulfurized Polyacrylonitrile Batteries

Li-SPAN batteries are a promising energy storage system, providing remarkable energy density and high Coulomb efficiency. However, the inherent sluggishness of the cathode's electrochemical kinetics and the instability of the Li anode hamper their cycle lifespan. In this study, a novel design of integrated configuration between cathode and electrolyte that addresses the challenges and promises to reshape the landscape of Li-SPAN, significantly enhancing the cycling stability, is presented. An artificial solid electrolyte interface (ASEI) is forged to simultaneously stabilize the Li anode and improve the interfacial compatibility, enabling an all-in-one battery system. A vertically aligned cathode structure is achieved using directional ice templating, enabling efficient Li-ion diffusion and enhancing electrochemical kinetics. The Li metal anode is coated with a MOF-on-COF ASEI, ensuring uniform Li⁺ deposition and high Li-ion transference number (0.86). Dual surface engineering further enhances the Li-SPAN cell, exhibiting a low capacity decay rate of 0.037% per cycle after 1000 cycles and superior C-rate performance. This study introduces promising strategies for effectively overcoming the challenges associated with the SPAN cathode and Li anode and paves the way for the design of high-performance Li-SPAN batteries, unlocking their full potential in the field of advanced energy storage systems.     

Electrochemical Oxidation of 5-Hydroxymethylfurfural on CeO2-Modified Co3O4 with Regulated Intermediate Adsorption and Promoted Charge Transfer

Electrocatalytic 5-hydroxymethylfurfural oxidation reaction (HMFOR) can replace the kinetically slow oxygen evolution reaction to yield high value-added chemicals. In this study, interface engineering is constructed by modifying CeO₂ nanoparticles on Co₃O₄ nanowires supported by nickel foam (NF). The construction of the heterointerface can facilitate the structural evolution of catalysts and charge transfer, as a result, the successfully synthesized NF@Co₃O₄/CeO₂ exhibits higher 5-hydroxymethylfurfural conversion (98.0%), 2,5-furandicarboxylic acid (FDCA) yield (94.5%), and Faradaic efficiency (97.5%) at a low electrolysis potential of 1.40 V_RHE compared to NF@Co₃O₄ and NF@CeO₂. Density-functional theory calculations indicate that the establishment of heterointerface can effectively regulate the intermediate adsorption and promote electron transfer, which greatly reduces the activation energy of the dehydrogenation step in 5-formyl-2-furancarboxylic acid (FFCA), and promotes the further oxidation of FFCA to FDCA, thereby improving the performance of HMFOR. In this study, the HMFOR behavior of the Co₃O₄/CeO₂ interface effect is deeply explored, which provides guidance for the future design of heterointerface catalysts with efficient HMFOR performance.     

Optoelectronic Synapses and Photodetectors Based on Organic Semiconductor/Halide Perovskite Heterojunctions: Materials,Devices, and Applications

Both photodetectors (PDs) and optoelectronic synaptic devices (OSDs) are optoelectronic devices converting light signals into electrical responses. Optoelectronic devices based on organic semiconductors and halide perovskites have aroused tremendous research interest owing to their exceptional optical/electrical characteristics and low-cost processability. The heterojunction formed between organic semiconductors and halide perovskites can modify the exciton dissociation/recombination efficiency and modulate the charge-trapping effect. Consequently, organic semiconductor/halide perovskite heterojunctions can endow PDs and OSDs with high photo responsivity and the ability to simulate synaptic functions respectively, making them appropriate for the development of energy-efficient artificial visual systems with sensory and recognition functions. This article summarizes the recent advances in this research field. The physical/chemical properties and preparation methods of organic semiconductor/halide perovskite heterojunctions are briefly introduced. Then the development of PDs and OSDs based on organic semiconductor/halide perovskite heterojunctions, as well as their innovative applications, are systematically presented. Finally, some prospective challenges and probable strategies for the future development of optoelectronic devices based on organic semiconductor/halide perovskite heterojunctions are discussed.