基于MAPC-RISR的MIMO雷达距离——角度二维超分辨率成像算法

MIMO雷达作为一种新型的雷达体制,其成像兼具实时性和高分辨率的特点,为了充分发挥MIMO雷达在成像方面的优势,提出一种高分辨率的MIMO雷达成像算法.首先将MIMO雷达成像过程分为距离向脉冲压缩和方位向聚焦成像两个过程,采用多波形自适应脉冲压缩技术(MAPC)实现距离向脉冲压缩和发射波形分离,然后在MIMO雷达虚拟阵列端利用超分辨率空间谱估计方法(RISR)进行方位向聚焦成像,得到了观测区域的距离—角度二维高分辨率的成像结果.理论分析表明,与已有的MIMO雷达自适应成像算法相比,所提方法降低了算法复杂度,提高了运算效率.仿真实验验证了所提MIMO雷达成像算法的有效性与优越性.     

酚醛树脂基中孔炭块体电极的制备与电容性能

提出了一种有机体系超级电容器用中孔炭电极的直接成型制备方法。以热塑性酚醛树脂为前驱体,加入六次甲基四胺固化、粉压成型后进行CO2活化,制备了中孔发达的炭电极。该电极比表面积1563 m2/g,孔容1.87cm3/g,其中孔孔容占75.9%,在有机电解液1mol/L Et4NBF4/PC中具有良好的电化学性能,比电容达108 F/g,大电流倍率性能良好。     

臭鼻克雷伯氏菌对试验动物致病力的初步研究

研究了臭鼻克雷伯氏菌对几种试验动物的致病力，证实该菌可引起鸭、鸽、小白鼠发病死亡，并使大白鼠、雏鸡等感染带菌，人工培养连续传代后，其毒力随英膜丧失而减弱。     

高校科研管理制度比较研究及导向思考

作为高校科研管理体系重要组成部分,高校科研管理制度在高校科研管理工作中扮演着十分重要的角色,通过对众多高校科研管理制度的收集、分析、整理,从科研管理模式、科研考核指标、科研奖励办法、科研管理队伍、科研管理制度入手,比较、分析了现实的高校科研管理制度,并结合科研压力、行政化干预和青年人才培养的现实反思了现行高校科研管理制度的导向性。     

胺结构对聚酰胺复合纳滤膜性能的影响

以改性后的聚丙烯腈(mPAN)为基膜,对苯二甲酰氯(TPC)为有机相单体,三乙烯四胺(TETA)和乙二胺(EDA)分别为水相单体,通过界面聚合法制备聚酰胺复合纳滤膜。采用全反射红外光谱分析仪(ATR-FTIR)研究了复合膜聚酰胺层的化学结构,通过扫描电镜(SEM)观察了复合膜的表面形态及断面结构,并对其性能进行了表征。结果表明,TETA-TPC/mPAN复合膜具有较高的截留率和较低的通量,EDA-TPC/mPAN复合膜具有较高的通量和较低的截留率。     

Approaches for improving the performance of filament-type resistive switching memory

Resistive random access memory (RRAM) has received significant research interest because of its promising potential in terms of down-scaling, high density, high speed and low power. However, its endurance, retention and uniformity are still imperfect. In this article, the physical mechanisms of filament-type RRAM and the approaches for improving the switching performance, including doping, process optimization and interface engineering, are introduced.     

Advancements in organic nonvolatile memory devices

As one of the most promising candidates for next generation storage media, organic memory devices have aroused worldwide research interest in both academia and industry. In recent years, organic memories have experienced rapid progress. We review the development of organic resistive switching memories in terms of structure, characteristics, materials used, and integration. Some basic concepts are discussed, as well as the obstacles hindering the development and possible commercialization of organic memory d...     

Structural diversity and reactivity of d^10 metal- （4-pyridylthio）acetate system

The hydrothermal synthesis and crystal structures of four coordination polymers, namely, 2D [Zn（μ3-ta）（pytaH）]n （1）, 2D [Zn（μ3-pyta）Cl]n （2）, 1D [Cd（μ-pyta）2（H2O）]n （3）, and 3D [Cd（μ3-pyta）（μ-Cl）]n （4） （pyta = （4-pyridylthio）acetate, ta = thioglycolate）, are reported. They are based on （4-pyridylthio）acetate and its derived ligand. The ta^2- ligand present in 1 was generated from an in situ C（sp^2）-S bond cleavage of the pyta ligand. In these compounds, versatile intermolecular interactions, such as close S…S interactions and strong （O-H…O/N/S） or weak （C-H…O/S, C-H…Cl） hydrogen bonding interactions, play an important role in the formation of three-dimensional supramolecular networks in the solid state.     

SCFP,a novel fiber-specific promoter in cotton

To investigate the expression pattern of GhSCFP which was isolated from cotton fiber cDNA library, a 1006 bp upstream fragment of the gene was cloned by chromosome walking and fused to GUSand GFP respectively. Histochemical GUS and GFP fluorescence analysis revealed that the expression of the report genes driven by the promoter sequence was detectable only in outer layer cells during the seed development in the transgentic tobaccos. In transgenic cotton, strong GUS activity was observed in spherical protrusions on 0 dpa （days post anthesis） ovule surface, and in the 2-36 dpa fiber cells, while no GUS signals were detected in the root, leaves, stem, corolla, anther and stigma. Our data demonstrated that GhSCFP upstream sequence is a cotton fiber-specific promoter and this promoter will be useful in the molecular research on fiber cell development and in cotton fiber improvements by genetic modification.