All Inorganic Halide Perovskites Nanosystem: Synthesis,Structural Features,Optical Properties and Optoelectronic Applications

The recent success of organometallic halide perovskites (OHPs) in photovoltaic devices has triggered lots of corresponding research and many perovskite analogues have been developed to look for devices with comparable performance but better stability. Upon the preparation of all inorganic halide perovskite nanocrystals (IHP NCs), research activities have soared due to their better stability, ultrahigh photoluminescence quantum yield (PL QY), and composition dependent luminescence covering the whole visible region with narrow line‐width. They are expected to be promising materials for next generation lighting and display, and many other applications. Within two years, a lot of interesting results have been observed. Here, the synthesis of IHPs is reviewed, and their progresses in optoelectronic devices and optical applications, such as light‐emitting diodes (LEDs), photodetectors (PDs), solar cells (SCs), and lasing, is presented. Information and recent understanding of their crystal structures and morphology modulations are addressed. Finally, a brief outlook is given, highlighting the presently main problems and their possible solutions and future development directions.     

组成、粘度比及加工条件对PB／CS共混物粘度和形态的影响

研究了组成、粘度比、转速和混合时间对聚丁烯／玉米浆共混物的粘度和形态的影响。结果表明，共混物的粘度均随转速的提高而增大。在高转速下，８０／２０共混物的粘度比其它组成的共混物的粘度增长迅速。在聚丁烯和玉米浆的界面观察到复合乳化结构。分散相液滴尺寸较小时，液滴尺寸的变化对共混物的粘度有很大的影响。     

Some Grubbs-Type Statistics for the Detection of Several Outliers

Several widely used tests for outlying observations are reviewed. Problems of repeated application and “masking” are described. Suggested as appropriate to over-come these problems are two new statistics: L_k which is based on the k largest (observed) values and E_k which is based on the k largest (in absolute value) residuals. Tables of approximate critical values for these statistics are given for 0.01, .025,0.05, and 0.10 levels of significance and for sample size n = 3 (1) 20 (5) 50.     

苯乙烯与BMI树脂的反应性研究

以ＢＭＩ、二烯丙基双酚Ａ和苯乙烯共聚制得一种低粘度、贮存期长、适用于压铸成型制备复合材料的树脂体系。本文重点研究了树脂的贮存稳定性、反应性及固化树脂的力学性能和耐热性。     

动态图像序列中鱼体体干运动建模

针对利用鱼游运动机理对水下仿生器进行研究的问题,本文从动态图像处理的角度出发,建立了基于动态图像序列的鱼体体干运动模型。首先,通过边缘检测得到鱼体轮廓,提出基于欧式距离变换的鱼体体干线提取方法,然后,拟合体干包络线和体干若干点的平动方程,获得细长体理论参数,建立鱼体体干运动模型。实验表明,本文建立的运动模型可以真实有效的描述自然状态下鱼类游动的体干曲线形变。     

低温切削技术及其应用研究

低温切削是指在低温环境下进行的切削过程,它利用低温下材料的物理化学性质,实现特定的加工目的。分析了低温切削技术的特点及其制冷技术,阐述了机械制造领域中低温切削技术的研究成果及应用状况。     

聚东极紫气育三江明珠

充分依托城市发展的区域比较优势,以科学发展观为指导,坚持以人为本、和谐发展的规划理念,以突出特色、注重生态为原则,从城乡统筹、地区协调发展的空间层面上,调整与优化城市空间结构,进行城乡整体区域的资源、人口、产业与城镇布局规划,重点区域进行空间管治规划,以促进城市整体竞争力的提高。     

应用数字图像相关法测定瓦楞原纸的泊松比

对瓦楞原纸泊松比的测定存在许多困难,传统的接触式方法难以满足测定要求,还没有一种简单高效的方法能解决这个问题。针对传统位移测量方法的不足,提出以数字图像相关法测定瓦楞原纸的泊松比。通过对试样变形前后的图像进行相关性位移分析,将试验所得的实测位移与已标定位移进行对比,所得结果具高度的一致性,相对误差范围为1%～3%。试验测定面纸MD（machine direction）方向和CD（crossmachine direction）方向的泊松比分别为0.175和0.073,芯纸MD方向和CD方向的泊松比分别为0.275和0.119。测试及分析结果表明,应用数字图像相关法测定瓦楞原纸的方法是可行的,具有较佳的应用价值,能为研究纸张的泊松比提供一个新途径。     

基于改进遗传算法的带式输送机滚筒优化设计

建立了以带式输送机滚筒质量最小为目标的数学模型,并运用实数编码策略、模拟罚函数法处理约束条件、自适应调整选择和交叉概率等对标准遗传算法进行了改进,利用改进的遗传算法对该问题进行了优化设计。优化设计实例表明,该方法是可行的,并可应用于其他优化设计过程中。     

全自动变压器绕线机自动排线控制技术研究

采用传统人工控制技术受到人为因素影响,在排线过程中出现惯性误差,导致控制效率较差,对于实现全自动变压器绕线机的高效率运行,提出了伺服自动排线控制技术的研究。根据绕线机主要设备,分析张力产生原因。使用三菱伺服驱动器,根据执行时发送的脉冲指令改变发送脉冲频率,在指定时间内使漆包线机构跟随绕线机主轴转动,由此获取排线时序图。根据时序图设计具体排线方案,通过调试确定惯性补偿系数,保证绕线能够平滑移动,改善惯性误差,实现恒定张力控制。通过调试结果可知,该技术最高控制效率可达到90%,为线圈绕制中绝缘带的张力控制和轴向紧密度提供保证。