Dopamine: Just the Right Medicine for Membranes

Mussel‐inspired chemistry has attracted widespread interest in membrane science and technology. Demonstrating the rapid growth of this field over the past several years, substantial progress has been achieved in both mussel‐inspired chemistry and membrane surface engineering based on mussel‐inspired coatings. At this stage, it is valuable to summarize the most recent and distinctive developments, as well as to frame the challenges and opportunities remaining in this field. In this review, recent advances in rapid and controllable deposition of mussel‐inspired coatings, dopamine‐assisted codeposition technology, and photoinitiated grafting directly on mussel‐inspired coatings are presented. Some of these technologies have not yet been employed directly in membrane science. Beyond discussing advances in conventional membrane processes, emerging applications of mussel‐inspired coatings in membranes are discussed, including as a skin layer in nanofiltration, interlayer in metal‐organic framework based membranes, hydrophilic layer in Janus membranes, and protective layer in catalytic membranes. Finally, some critical unsolved challenges are raised in this field and some potential pathways are proposed to address them.     

Engineering the Exciton Dissociation in Quantum‐Confined 2D CsPbBr3 Nanosheet Films

Recent years have witnessed a rapid development of all‐inorganic halide perovskite in optoelectronic devices. Ultrathin 2D CsPbBr₃ nanosheets (NSs) with large lateral dimensions have demonstrated exceptional photophysical properties because of their analogous exciton electronic structure to quantum wells. Despite the incredible progress on device performance, the photophysics and carrier transportation parameters of quantum‐confined CsPbBr₃ NSs are lacking, and the fundamental understanding of the exciton dissociation mechanism is far less developed. Here, a ligands rearrangement mechanism is proposed to explain why annealed NS films have an increased charge transfer rate and a decreased exciton binding energy and lifetime, prompting tunneling as a dominant way of exciton dissociation to separate photogenerated excitons between neighboring NSs. This facile but efficient method provides a new insight to manipulate perovskite nanocrystals coupling. Moreover, ultrathin 2D CsPbBr₃ NS film is demonstrated to have a enhanced absorption cross section and high carrier mobility of 77.9 cm² V^?1 s^?1, contributing to its high responsivity of 0.53 A W^?1. The photodetector has a long‐term stability up to three months, which are responsible for reliable perovskite‐based device performance.     

一种基于多传感器的红外图像正则化超分辨率算法

提出一种红外图像多传感器超分辨率重建算法。 算法存在两个关键点:一是有效利用两类图像的相关性;二是针对红外图像的特点利用其自 身信息 构造正则化模型。采用相位一致性算法提取可见光图像边缘,利用此边缘信息对正则化模型 加权,以 充分利用可见光和红外图像的相关性;将一阶梯度锐化算子引入总广义变分模型,构成针对 红外 图像特点的正则化模型;最后采用一阶主-对偶优化算法求得加权后模型的最优解。实验表 明,本文算法可获得边缘清晰的重建结果,并且有效抑制噪声,在主观视觉效果和客观评价 指标方面均优于其他算法。     

Optimal design of multistage discrete Raman amplifiers incorporating midway isolators

Multistage discrete Raman amplifiers with midway isolators to suppress double Rayleigh backscattering are fully investigated at constant nonlinearity. The results show that placing Raman pumps at the last stage only is sufficient. For most conditions, two isolators can achieve adequate performance improvement, while more isolators only lead to slightly optical signal-to-noise ratio increase. The optimum positions of the isolators are insensitive to varied Raman gains, nonlinear phase shifts, and Rayleigh coefficients, but sensitive to different fiber lengths as well as Raman pumping schemes. Moreover, backward-pumping schemes can derive better noise performance than bidirectional pumping when using midway isolators.     

一种高分辨率机载SAR实时数据处理系统设计

该文给出了一种高分辨率合成孔径雷达实时数据处理系统的方案设计与实现。该方案采用PowerPC G4处理器进行运算,采用VME作为系统总线,RACE++作为高速数据通道,具有稳定、计算能力强、可灵活配置等优点。通过简单的扩展或裁减就可以提供不同的计算能力与数据带宽,可以适合于多种分辨率与模式的SAR系统实时数据处理。     

GF（2^8）上快速乘法器及求逆器的设计

基于多项式乘法理论，采用高层次设计方法，设计并采用ＦＰＧＡ实现了ＧＦ（２＾８）上８位快速乘法器，并利用该乘法器设计了一个计算ＧＦ（２＾８）上任一元素的例数的求逆器，该乘法器与求逆器可以应用于ＲＳ（２５５．２２３）码编／译码器。     

基于模块化结构的N位加法器的测试生成

针对单个ｓｔｕｃｋ－ａｔ故障，研究了Ｎ位加法器的测试矢量生成问题，对于行波进位加法器，只需８个测试矢量就可得到１００％的故障覆盖率；对于Ｎ位先行进位加法器，只需Ｎ＾２＋２Ｎ＋３个测试矢量即可得到１００％的故障覆盖率。     

高压硅堆在雷达发射机中的应用

较详细地介绍了高压硅堆在大功率电路中运用的成功经验和失败教训，列举了在高压整流电路、调制器内的充电电路、反峰电路、阻尼电路、高效率ｄｅ－Ｑ装置的回授电路和箝位限幅电路中运用高压硅堆的条件及工作状态的特点。指出了有些电路目前还不能用国产硅堆可靠地取代真空电子二极管的原因     

混流式水轮机叶片数控加工工艺过程

本文以5轴数控联动铣削混流式叶片的实际加工过程为依据,详细地论述了混流式叶片加工的工艺、卡具和刀具的准备、加工时叶片的装卡、测量、铣削和检查的全过程以及在加工中应给予重视的一些问题。     

一种新的连铸中间包钢水液位测量方法

连铸中间包的钢水的液位测量环境恶劣和钢水上层覆盖保护渣层而导致钢水液位测量困难、测量准确度不高.针对此现状,本文提出了一种基于温场信息,利用计算机视觉测量实现的钢水液位测量方法.此方法通过对中间包内的空气层、保护渣、钢水层温场分析和获取,确定空气层-保护渣层和保护渣层 钢水层的温度梯度分界面位置,从而得到中间包内钢水液位.测量方法应用到现场,统计得到测量平均绝对误差为3.2mm,最大误差为5.2mm,最小达到0.3mm,本文液位测量方法准确可靠,具有良好的应用前景.