表面注入D-RESURF器件耐压模型

建立表面注入双重降低表面电场(D-RESURF)结构击穿电压模型。D-RESURF器件在衬底纵向电场和Pb区附加电场的影响下,漂移区电荷共享效应增强,优化漂移区掺杂浓度增大,器件导通电阻降低。分析漂移区浓度和厚度对击穿电压的影响,获得改善击穿电压和导通电阻折中关系的途径。在满足最优表面电场和完全耗尽条件下,导出吻合较好的二维RESURF判据。在理论的指导下,成功研制出900 V的D-RESURF高压器件。     

Modular Assembly of Red Blood Cell Superstructures from Metal–Organic Framework Nanoparticle-Based Building Blocks

Bio/artificial hybrid nanosystems based on biological matter and synthetic nanoparticles (NPs) remain a holy grail of materials science. Herein, inspired by the well-defined metal–organic framework (MOF) with diverse chemical diversities, the concept of “armored red blood cells” (armored RBCs) is introduced, which are native RBCs assembled within and protected by a functional exoskeleton of interlinked MOF NPs. Exoskeletons are generated within seconds through MOF NP interlocking based on metal-phenolic coordination and RBC membrane/NP complexation via hydrogen-bonding interactions at the cellular interface. Armored RBC formation is shown to be generalizable to many classes of MOF NPs or any NPs that can be coated by MOF. Moreover, it is found that armored RBCs preserve the original properties of RBCs (such as oxygen carrier capability and good ex ovo/in vivo circulation property) and show enhanced resistance against external stressors (like osmotic pressure, detergent, toxic NPs, and freezing conditions). By modifying the physicochemical properties of MOF NPs, armored RBCs provide the capability for blood nitric oxide sensing or multimodal imaging. The synthesis of armored RBCs is straightforward, reliable, and reversible and hence, represent a new class of hybrid biomaterials with a broad range of functionalities.     

Laser-Induced Graphene Tapes as Origami and Stick-On Labels for Photothermal Manipulation via Marangoni Effect

Direct light-to-work conversion enables remote actuation through a non-contact manner, among which the photothermal Marangoni effect is significant for developing light-driven robots because of the diversity of applicable photothermal materials and light sources, as well as the high energy conversion efficiency. However, the lack of nanotechnologies that enable flexible integration of advanced photothermal materials with actuators of complex configurations significantly restricts their practical applications. In this paper, laser-induced graphene (LIG) tape is reported as stick-on photothermal labels for developing light-driven actuators based on the Marangoni effect. With the help of direct laser writing technology, graphene patterns with superior photothermal properties are prepared on the PI tape. The patterned LIG tape can be stuck on any desired objects and generates an asymmetric photothermal field under light irradiation, forming a photothermal Marangoni actuator. Additionally, the PI tape with LIG patterns can be folded into 3D origami actuators that permit photothermal Marangoni actuation including both translation and rotation. The graphene-based photothermal Marangoni actuators feature biocompatibility, which is confirmed by MDA-MB-231 cells proliferation experiments. Owing to the excellent photothermal property of LIG patterns, the as-produced photothermal actuators can be manipulated by a variety of light sources, holding great promise for developing light-driven soft robots.     

基于认知无线电抗干扰技术分析

认知无线电作为抗干扰有效措施之一,可以提高通信系统在日益复杂的战场通信环境下的适应能力。与传统的抗干扰手段相比,基于认知无线电的抗干扰技术具有更强的灵活性、适应性和鲁棒性,在军事通信领域越来越受到重视。论述了基于认知无线电的抗干扰系统架构,阐述了认知设备各模块的功能,对宽频带实时频谱感知、频谱动态分配和自适应参数优化调整等关键技术进行了分析。     

FIR滤波器在扩频发射机中的应用

直接序列扩频技术以保密性强和抗多径衰落等优点而获得广泛的应用,针对在多系统兼容工作时出现的邻近通道干扰的问题,从扩频通信的工作原理入手进行分析,分析邻近通道干扰产生的来源,采用基带信号有限脉冲响应(FIR)滤波器的方式,实现邻近通道抑制的要求。在此基础上设计的解决方案,经过实际系统试验验证,可以很好地解决邻近通道干扰的问题。     

FAT文件系统在NAND FLASH上的磨损均衡研究

提出一种应用于NAND FLASH上实现FAT文件系统磨损均衡的方法,通过保留已删除文件在FAT表中的表项和重写文件时将内容写入新簇的方式,实现对NAND FLASH的均衡使用.在牺牲一定读写速度的前提下,有效地实现了对NAND FLASH的均衡磨损,延长了NAND FLASH的使用寿命.在文件系统层研究磨损均衡,实现难度小,且对标准FAT文件系统兼容,具有一定的可行性和实用性.     

低损伤ICP刻蚀技术提高GaN LED出光效率

首先分析了在制作GaN基LED时,采用干法刻蚀技术会对材料的表面和量子阱有源区造成损伤,影响了GaN基LED的内量子效率。针对这个问题,研究实验采用感应耦合等离子反应刻蚀(ICP-RIE)技术,分别选择了氯气/三氯化硼(Cl2/BCl3)气体体系和氯气/氩气(Cl2/Ar)气体体系,通过优化射频功率、ICP功率、气体流量以及相应的真空度,得到了良好的刻蚀端面,对于材料造成的损伤较低,得到更好的I-V特性。实验结果表明,采用低损伤的偏压功率刻蚀后制作的LED器件,出光功率提升一倍以上,同时采用Cl2/Ar气体体系,改善了器件的I-V特性,有效提高了LED的出光效率。     

高压变频器在烧结机余热风机上的应用

本文介绍了高压变频器在首钢京唐公司1#烧结机余热风机上的应用案例,以及采用新型空-水冷却系统解决高压变频器散热问题的情况,通过对利德华福高压变频器的实际运行数据分析,说明其具有良好的节能效果。     

"自上而下"法制备高性能GaN纳米线阵列

针对自下而上生长GaN纳米线的尺寸、形态、取向不易控制的问题,文中采用自上而下刻蚀的方法来制备GaN纳米线材料。以图形化的金属Ni作为掩膜对GaN进行ICP刻蚀,系统研究了刻蚀参数,主要是ICP功率以及RF功率对GaN纳米线形貌以及拉曼、PL光谱的影响,同时也对比了干法刻蚀后,有无湿法处理的影响。研究发现,当ICP功率为1 000 W,RF功率为100 W时,GaN纳米线的拉曼和PL光谱强度较大,表明此功率下刻蚀的纳米线损伤较小。经过KOH浸泡30 min后,GaN纳米线的形貌得到了改善,拉曼和PL光谱强度均优于单纯的干法刻蚀,为下一步器件的制备提供了良好的材料基础。     

基于边缘信息的运动模糊图像的鲁棒盲复原

为获得适用于不同模糊图像且简捷的图像盲复原方法,提出了一种稳健的从单幅模糊图像中求取模糊核并对图像去模糊的图像盲复原方法。根据模糊图像与非模糊图之间的边缘关系求模糊核,并在多尺度框架下针对各个子算法设定自适应参数,从而构建一个稳健的图像盲复原方法。对复原结果用4种无参考的图像质量评价方法的评价结果显示,本文方法在噪声和...