辐射测厚仪测量精度分析与误差补偿技术

简单介绍了透射式辐射测厚原理,分析与研究了影响辐射测厚仪测量精度的各种因素.为了保证和提高测量精度,利用分段多项式曲线拟合与查表线性插值相结合的方法实现非线性补偿,利用软件查表法对测量气隙进行动态的温度补偿,利用内藏标样进行动态自动校正以实现综合误差补偿.实际应用表明,辐射测厚仪经过上述误差补偿后,测量范围广、测量精度高、性能稳定可靠、应用广泛.     

非线性光学测试装置及其初步应用

研制了非线性光学测试装置 ,文中给出了基本原理 ,测试装置方框图和部分初步应用结果。     

微机械陀螺的动力学特性研究

有关微机械振动式陀螺的动力学特性测试的结果很多,而与微机械振动式陀螺设计相关的动力学特性的定量结果却很少见.文中基于拉格朗日方程建立微机械振动式陀螺的动力学方程,分析其动力学特性,推导其灵敏度与非线性度的计算公式,考虑输入角加速度影响的情况下,分析其带宽特性,并对其带宽特性进行模拟.所得结论对微机械振动式陀螺的设计提供一定的理论依据.     

AD590温度传感器的非线性补偿方法

针对集成温度传感器AD590应用中存在的非线性问题,介绍了AD590的特点、工作原理及非线性误差产生的原因,重点讨论了实际应用中AD590在环境温度采集时温度补偿的几种方法,实验结果表明这些方法成本低、误差小、精度高。     

Spin-filter silicene devices induced by asymmetric electrodes

Using nonequilibrium Green's function in combination with the density functional theory, we investigate the spin-dependent transport properties of three silicene-based heterojunctions. The calculated results show that the heterojunctions are promising multifunctional devices in spintronics due to their nearly perfect bipolar spin-filter effect and high rectification ratio. Also shown are the obvious negative differential resistance behaviors for both spin channels. By analyzing the spin-resolved transmission spectra and the band structure of ZSiNR electrodes, as well as the spatial resolved local density of states, the mechanisms for these intriguing properties are demonstrated in detail.     

Controllable memristive patterns in poly(9,9-dioctylfluorene)-based sandwich device

Currently, there are two prevalent types of I-V memristive patterns for memristive applications, 0-type and 8-type hysteresis loop, and their respective characteristics result in their specific applications in different situations, such as data storage and neuromorphic computing. In spite of the abundant achievements of these remarkable performances, scarce works are specially concerned about the relations and regulations between them for persuing the multiple functions in a single element, and an ideal platform with both the achievements and controllable transformations has been rarely reported. Herein, the novel organic material—poly(9,9-dioctylfluorene) (PFO) is utilized to construct the sandwich prototype. The electrical transporting properties are systematically investigated through particular programming protocols. The 0-type and 8-type memristive patterns are successfully obtained during low and high voltage sweeps, respectively. Then the sectionalized fitting results of the current curves, the carrier transporting behaviors as well as the regulations of device energy levels are associatively demonstrated to analyze the electrical activity-dependent transformations between different memristive patterns. More importantly, the appearance of the 8-type hysteresis loop can be regulated by the rectification property, and the rectification can be largely enhanced by the reconfiguration of device energy levels. Consequently, for the versatile memristive device, based on the 0-type hysteresis, it can serve as a data storage or artificial synapse element, and the rectification-modified memristive behaviors can effectively impede the unintended sneak current paths for high-density integration.     

精馏塔分级最优控制的探讨

精馏控制是非常复杂的，其方案亦非常多，以一个精馏为例，应用多级递阶结构，按照关联平衡的协调原则，将精馏过程分解为回流量调节，物料平衡与能量平衡等三个子系统，并以回流量作为协调变量，去操纵物料平衡和能量平衡，以此实现对精馏塔的最优控制。     

卫星遥感数字图象地理位置纠正、分类与成图研究

本文就MSS图象的地理位置纠正、分类与成图以及有关问题进行论述。在监督分类过程中,提出并采用了“同类分组法”准则和“相对距离阈值”,以提高分类质量。在地理位置纠正方面,分析了MSS图象的畸变因素,对连续性和非连续性畸变都作了纠正。绘图程序设计中考虑了绘图机的成图特点和效率,以提高图件精度和绘图速度。绘制的杭州西湖地区与大门山地区1∶5万彩色分类图质量好,地理位置正确,自动注记出的高斯—克吕格方里网和地形图上的方里网格完全重合,使遥感分类图象“地图化”。     

吉林省200MW汽轮机调节系统存在问题分析

分析了吉林省200MW汽轮机调节系统运行中存在的问题,并指出70、72型机负荷不稳定系油动机静特性呈非线性所致;34、55型机油机卡涩系提升力矩不足所致。