MEMS电磁执行器CoNi MnP永磁体阵列的制备

永磁材料在微电子机械系统 (MEMS)器件中具有重要的应用价值 ,例如微型开关、微型继电器以及微泵、微阀中作电磁执行器等。本文介绍了CoNiMnP永磁体阵列的制备技术 ,给出了工艺制备的实验条件 ,并利用SEM分析了阵列的表面形貌 ,电子能谱分析了永磁材料组分。实验结果表明 ,得到了很好的CoNiMnP永磁体阵列结构 ,具有较高的矫顽磁力的材料组分比例 :Co 85 %、Ni14 %。     

电子对抗指挥自动化系统等级互操作研究

本文就电子对抗指挥自动化系统等级互操作的概念进行了阐述 ,指出在信息作战环境下实施等级互操作的必要性 ,并对电子对抗指挥自动化系统的互操作等级层次进行了分析     

化学复合镀层激光处理研究

研究了激光处理对Ni-P -SiC化学复合镀层的影响。借助于扫描电镜、能谱仪、X射线衍射、显微硬度计等设备对激光处理后复合镀层的表面形貌、组织结构及性能进行了综合分析。结果表明 ,对复合镀层进行激光处理可以获得与炉内加热同样的镀层硬度 ,且当激光功率 4 0 0W ,扫描速度 1.5m /min时 ,镀层硬度高于炉内加热的硬度     

世界FPD的强势发展及其竞争态势

世界经济东移已成共识，20世纪是美国的世纪。21世纪是亚洲世纪。历史告诉我们：20世纪的标志性产业之一无疑是LSI。LSI是电子设备的心脏，正是它领导了电子工业的前进，当然地成了美国的重要战略产业。21世纪是视图时代，新世纪引领电子工业发展的是FPD，它是人与电子设备鲜活的界面，是提高和改善人类生活的重要一环，肯定是新世纪的标志性产业之一。事实证明，它已成为今天亚洲国家或地区的重要战略产业。 针对我国实际，作者2004年便提出了我国电子产业要由大变强，必需LSI与FPD“双业并举，共同发展”，不能再走先LSI后FPD的老路。为此，本刊不断发表文章，大力呼吁，愿智者垂听，愿读者赐教。[编者按]     

AlGaN/GaN HEMT二维静态模型与模拟

考虑AlGaN/GaN材料的自发、压电极化效应和量子效应,通过泊松方程、薛定谔方程和流体力学方程组的数值自洽求解方法,对AlGaN/GaN HEMT的二维静态模型与模拟问题进行了研究,得到了器件区域的导带图、二维电子气分布、电子温度特性、直流输出和转移特性,并对模拟结果进行了分析与讨论.     

海战场电子战的发展和对策

简述海战场电子战在现代海战中的作用,分析海战场电子战的发展水平和面临的挑战,提出海战场电子战的发展趋势和对策。     

激光干扰对CCD成像系统目标检测性能的影响

分析成像系统的工作过程及常用检测算法,针对激光干扰图像的特点,结合背景杂波的量化方法,提出基于目标背景结构相似度与平方和根的图像尺度。该尺度利用结构相似度在成像检测方面以及平方和根尺度在目标局部对比度方面的优点,适用于激光干扰后检测算法性能的评估。激光视场内干扰与视场外干扰的实验显示:激光干扰使得Otsu算法的分割精度受到较大影响;对于相关检测算法,激光干扰会使相关曲面出现较大的波动,增大了虚警概率。研究结果表明:该尺度能够较好地反映激光干扰图像对于CCD成像检测算法性能的影响,初步验证了尺度的有效性。     

Electrically Tunable Nanoporous Carbon Hybrid Actuators

A novel nanoporous carbon/electrolyte hybrid material is reported for use in actuation. The nanoporous carbon matrix provides a 3D network that combines mechanical strength, light weight, and low cost with an extremely high surface area. In contrast to lower dimensional nanomaterials, the nanoporous carbon matrix can be prepared in the form of macroscopic monolithic samples that can be loaded in compression. The hybrid material is formed by infiltrating the free internal pore volume of the carbon with an electrolyte. Actuation is prompted by polarizing the internal interfaces via an applied electric bias. It is found that the strain amplitude is proportional to the Brunauer‐Emmett‐Teller (BET) mass specific surface area, with reversible volume strain amplitudes up to the exceptionally high value of 6.6%. The mass‐specific strain energy density compares favorably to reported values for piezoceramics and for nanoporous metal actuators.     

氟镓酸盐红外玻璃窗口多波段增透保护膜研制

氟镓酸盐玻璃是一种性能良好的红外光窗材料。为了提升窗口观测、探测及防护性能,在氟镓酸盐基底上设计和制备了0.4~0.9 μm、1.064 μm、3.7~4.8 μm三波段复合增透保护膜。根据光学性能及环境稳定性要求选择薄膜材料并对膜系进行了设计,然后利用电子束蒸发方法对多层膜进行了制备。测量结果表明,2.9 μm处的水吸收峰拉低了中红外波段的透过率。通过改进工艺及后处理等途径提高了膜层致密度,有效抑制了膜层的水吸收。利用沸水浸泡法对镀膜元件的环境稳定性进行了实验验证。结果表明,经过离子束辅助沉积及退火处理的薄膜样品具有较好的光学性能和环境适应性。     

A new fuzzy‐based method for load balancing in the cloud‐based Internet of things using a grey wolf optimization algorithm

Cloud computing provides high accessibility, scalability, and flexibility in the era of computing for different practical applications. Internet of things (IoT) is a new technology that connects the devices and things to provide user required services. Due to data and information upsurge on IoT, cloud computing is usually used for managing these data, which is known as cloud‐based IoT. Due to the high volume of requirements, service diversity is one of the critical challenges in cloud‐based IoT. Since the load balancing issue is one of the NP‐hard problems in heterogeneous environments, this article provides a new method for response time reduction using a well‐known grey wolf optimization algorithm. In this paper, we supposed that the response time is the same as the execution time of all the tasks that this parameter must be minimized. The way is determining the status of virtual machines based on the current load. Then the tasks will be removed from the machine with the additional load depending on the condition of the virtual machine and will be transferred to the appropriate virtual machine, which is the criterion for assigning the task to the virtual machine based on the least distance. The results of the CloudSim simulation environment showed that the response time is developed in compared to the HBB‐LB and EBCA‐LB algorithm. Also, the load imbalancing degree is improved in comparison to TSLBACO and HJSA.