电子束曝光UV3正性抗蚀剂的工艺研究

为了在体硅CMOSFinFET中用等离子体腐蚀精细凹槽图形，研究了将电子束直写曝光用于原为深紫外光学曝光的UV3正性抗蚀剂的工艺技术；详细分析了包括膜厚、曝光能量、曝光剂量、显影时间、设计尺寸和衬底材料等在内的各类工艺参数与实际曝光图形效果的关系；特别指出了曝光过程中特有的延迟效应及解决办法。采用最终的优化工艺条件，得到了合适的图形效果。     

直扩接收机基带迟早门跟踪环的简化设计

针对要求设计简化、资源有限的设备和系统 ,通过对直扩接收机基带迟早门跟踪环的性能分析 ,在扩频增益比较大时 ,提出了一种简化设计结构 ,用两个由扩频码的部分序列构成的相关器分别替代原来早门和迟门的完全序列相关器。仿真表明该结构在给定足够的相关值情况下 ,性能略有恶化 ,但资源却得到较大节约 ,设计可大大简化。     

基于遗忘因子RLS算法的自适应直达波对消技术

在以民用广播、电视及CDMA等信号为照射源的无源雷达系统中,由于发射信号为连续波信号,直达波和多径信号对雷达回波的干扰很强,影响了目标的检测。为此采用RLS自适应对消处理技术来抑制直达波干扰,针对RLS自适应算法的性能分析,提出了改进RLS自适应处理算法,收到了良好的滤波效果。最后在以广播信号为照射源的实验系统中,根据实际采集的数据进行仿真论证,验证了该方法的可行性。     

基于工具软件的直接数字频率合成器设计方法

利用FPGA设计直接数字频率合成器(DDS),通常是采用硬件描述语言与原理图输入相结合的方法。对设计者的硬件基础要求较高,且要求熟悉硬件电路设计语言,综合性较强。提出一种基于DSP Builder的直接数字频率合成的设计方法,在DSP Builder软件中完成FPGA DDS的模型设计,在Simulink软件中完成图形界面下的建模、仿真和系统集成。设计实例表明:通过系统参数的设置可方便地对信号的频率及相位进行修改,继而缩短了研制周期,为DDS设计提供了一种新的设计方法。该方法无需编制复杂的程序代码,利用DSPBuilder软件友好的图形开发界面就可进行系统设计,且开发环境与QuartusⅡ软件交互性强,便于修改,具有良好的可重配性。     

Test and Analysis for Spraying Ammonia in Diesel Engine

A certain amount of ammonia reducer were directly injected into the 4102BZLQ Diesel engine’s combustion chamber when the combustion temperature decreases to 1573-1073K, NOx generated could be reduced to 1.11g/(kW·h). Based on PRF combustion mechanism, NO was tested by using the heavy-duty diesel engine test cycle of ESC thirteen conditions[1], the ammonia spray angle and amount were tested and optimized in different conditions. The test results show that the thermal efficiency of Diesel engine does not decrease while NO exhaust decreases.     

可重复使用助推飞行器轨迹优化研究

在充分调研国内外轨迹优化方法的基础上,针对可重复使用助推飞行器飞行过程中有一段大攻角飞行且期间还需进行一次大角度翻转的飞行模式,以俯仰角为最优控制量,采用直接打靶法和序列二次规划法,选择速度作为过渡量,将分离点至再入结束点的飞行过程分为调姿转弯段和再入段进行优化.分析了过渡速度和分离点处弹道倾角的取值,得到了较为合理的过渡速度和分离点处弹道倾角的取值范围,进行了该飞行过程的全段轨迹优化.仿真结果表明本文给出的优化策略能较好地获得一条满足约束条件的优化轨迹.     

直流微电机用环形低压压敏电阻器的性能比较

测量了目前直流微电机消噪用 Zn O和 Sr Ti O3两类环形压敏电阻器的特性参数 ,分析了它们的介电 -频率和介电 -温度特性 ,并与所研制的用籽晶法制备的 Zn O压敏电阻的性能相比较。比较测量结果说明 ,采用籽晶法制备的 Zn O压敏电阻器 ,具有易于低压化且压敏特性良好的优点。尽管 Zn O的电容量不及 Sr Ti O3,但由于Zn O压敏电阻的制备属常规工艺且成本低廉 ,在要求价格低的直流微电机应用领域 ,只要提高 Zn O环形压敏电阻器的压敏特性 ,它仍具有较高的实用价值     

软件无线电中直接波形合成的研究

直接数字频率合成（DDS）是一种新型的频率合成技术。介绍了如何利用DDS技术来产生调频波形及其他的数字调制波形;阐述了一种新的适合于软件无线电实现的算法,即采用预先计算后存贮在贮存器中的波形来代替实时运算,直接合成数字调制波形（DWS）;研究了一种压缩查找表的方法。此外,还对此算法在实现过程中遇到的截断误差、运算量和存贮量的问题进行了探讨。对于所提及的算法,给出了仿真结果。     

A Materials Perspective on Direct Recycling of Lithium-Ion Batteries: Principles,Challenges and Opportunities

As the dominant means of energy storage technology today, the widespread deployment of lithium-ion batteries (LIBs) would inevitably generate countless spent batteries at their end of life. From the perspectives of environmental protection and resource sustainability, recycling is a necessary strategy to manage end-of-life LIBs. Compared with traditional hydrometallurgical and pyrometallurgical recycling methods, the emerging direct recycling technology, rejuvenating spent electrode materials via a non-destructive way, has attracted rising attention due to its energy efficient processes along with increased economic return and reduced CO₂ footprint. This review investigates the state-of-the-art direct recycling technologies based on effective relithiation through solid-state, aqueous, eutectic solution and ionic liquid mediums and thoroughly discusses the underlying regeneration mechanism of each method regarding different battery chemistries. It is concluded that direct regeneration can be a more energy-efficient, cost-effective, and sustainable way to recycle spent LIBs compared with traditional approaches. Additionally, it is also identified that the direct recycling technology is still in its infancy with several fundamental and technological hurdles such as efficient separation, binder removal and electrolyte recovery. In addressing these remaining challenges, this review proposes an outlook on potential technical avenues to accelerate the development of direct recycling toward industrial applications.     

In Situ Electrical Network Activation and Deactivation in Short Carbon Fiber Composites via 3D Printing

Prior studies on carbon-filler based, conductive polymer composites have mainly investigated how conductive filler morphology and concentration can tailor a material's electrical conductivity and overlooks the effects of filler alignment due to the difficulty to control and quickly quantify the filler alignment. Here, direct ink write 3D printing's unique ability is utilized to control carbon fiber alignment with a single process parameter, velocity ratio, to instantaneously activate or deactivate the electrical network in composites. Maximum electrical conductivity is achieved by randomly aligning carbon fibers that enhances the chance of direct fiber-to-fiber contact and, thus, activating the electrical network. However, aligning the fibers by increasing the velocity ratio disrupts the electrical network by minimizing fiber-to-fiber contact that resulted in a drastic decrease in electrical conductivity by as much as five orders of magnitude in both short and long carbon fiber composites. With this study, this study demonstrates that electrically conductive or insulative composites can be fabricated sequentially with a single ink. This novel ability to instantaneously control the electrical conductivity of carbon fiber reinforced composites allow to directly embed conductive pathways into designs to 3D print multifunctional composites that are capable of localized heating and self-sensing.