黄色秸秆直燃电站给料系统的优化研究

以黄色秸秆生物质直燃发电项目为研究对象,通过对北欧和国内部分已投运的黄色秸秆直燃电站大捆给料系统进行分析,指出由于国内外在生物质收集预处理方式上存在的差异,大捆给料系统方式在国内应用时存在大型打捆机械缺乏、打捆成型成本太高以及系统对捆型尺寸变化适应性差的缺陷和局限性.为了使给料系统更适应国情,提出了黄色秸秆任意捆型给料系统和小捆整捆给料和燃烧的两种优化设计方案,为后续生物质直燃电厂的建设和运行提供了参考.     

一种激光多普勒扭矩传感器的设计原理研究

在空间坐标系中对旋转体上任意一点进行了的振动分析,利用激光多普勒技术设计了一种新型非接触式光学扭矩传感器,得到纯的扭振信号,消除了弯曲振动、线性运动、旋转体形状影响.     

Intermolecular π–π Conjugation Self-Assembly to Stabilize Surface Passivation of Highly Efficient Perovskite Solar Cells

Surface passivation is an effective approach to eliminate defects and thus to achieve efficient perovskite solar cells, while the stability of the passivation effect is a new concern for device stability engineering. Herein, tribenzylphosphine oxide (TBPO) is introduced to stably passivate the perovskite surface. A high efficiency exceeding 22%, with steady-state efficiency of 21.6%, is achieved, which is among the highest performances for TiO₂ planar cells, and the hysteresis is significantly suppressed. Further density functional theory (DFT) calculation reveals that the surface molecule superstructure induced by TBPO intermolecular π–π conjugation, such as the periodic interconnected structure, results in a high stability of TBPO–perovskite coordination and passivation. The passivated cell exhibits significantly improved stability, with sustaining 92% of initial efficiency after 250 h maximum-power-point tracking. Therefore, the construction of a stabilized surface passivation in this work represents great progress in the stability engineering of perovskite solar cells.     

Microwave-assisted synthesis of anatase TiO(2) nanorods with mesopores

Pure anatase TiO(2) nanorods with mesopores were synthesized by a simple and low cost microwave-assisted method when tri-block copolymer was used as a structure stabilization agent and TiCl(4) as metal precursor. TEM investigation showed that larger nanorods were assembled by pearl-necklace-shaped nanorods following an oriented attachment mechanism in a specific direction. A proposed hypothetical scheme showed that the formation of lyotropic titania liquid crystal (TLC) serves a key role in the stabilization of nanorods, and the mesopores on nanorods are derived from the vacancy of inter-particles of nanorods and regions lacking inorganic precursors in the TLC structure. Control experiments showed that microwave treatment plays a key role in the maintenance of original morphologies and mesostructures free from destruction even under high temperature calcinations.     

水位图像识别的场景问题处理方法和技术

水位图像识别系统基于人工智能图像识别技术,通过对水尺进行智能识别,直接获得水位的数值,但在实际应用中,由于受场景因素的干扰,稳定性大受影响。通过采用深度学习算法、多帧识别、曝光参数优化,以及摄像机硬件及光学的定制等多种手段相结合,解决各种场景因素的干扰,并在杭州之江水文站进行比测。比测结果表明,智能图像识别水尺系统满足水位观测标准中自记式水位计的要求,与传统水位测量相比,具有建设成本低、测量方式高效的优势,具有广阔的应用前景。     

国家游泳中心围护结构节能分析

国家游泳中心(水立方)采用双层ETFE气枕围护结构,在薄膜上镀有银点,通过调整薄膜的层数和镀点密度,优化不同围护结构部分的传热系数和遮阳系数,同时通过对围护结构空腔部分采取机械通风来降低夏季室内冷负荷。通过模拟软件对围护结构被动式太阳能利用、自然采光、空腔通风、自然通风等进行了节能分析计算,并将实际建筑与根据相关标准建立的参照建筑进行了全年能耗模拟比较,结果表明这种围护结构节能效果显著。     

块匹配运动估计VLSI结构研究与进展

块匹配运动估计是视频编码器中的计算量和存储访问最密集的模块,为了满足实时编码的需求常用VLSI结构实现.本文对块匹配运动估计的VLSI结构作了系统的总结,并提出了改进的方向.     

一种全搜索块匹配运动估计VLSI结构

提出了一种新的两维全搜索运动估计VLSI结构。该结构基于两维脉动阵列,能够完全实现两维数据重用,减少了对外部存储器数据量的访问,具有100%的硬件效率和高吞吐率。该结构也可以很容易地应用于不同块尺寸、不同的搜索范围的全搜索块匹配运动估计,具有通用性。     

The coupling impedance of vane-loaded tape helix slow-wave structure

Based on the actual vane-loaded tape helix slow wave structure, a new theoretical analytic model for calculating coupling impedance is proposed by Chen Qingyou, et al.(1999) with calculated values of dispersion in good agreement with measured ones. In this paper, it is continued to use this model to calculate the coupling impedance of such a structure, and analyze the effects of the propagation power within vane gaps and the helix gap on the coupling impedance. As a result, the theoretical values are found to be in good agreement with the measured ones, with the maximum difference less than ?8%.     

单翼圆柱电磁散射的混合解

本文利用混合法分析和计算了单翼理想导电圆柱远场散射。这种混合法应用了物理光学近似（ＰＯ）、ＦＯＣＫ理论、物理绕射理论（ＰＴＤ）、几何绕射理论（ＧＴＤ）和矩量法。计算结果与矩量法和Ｍｉｃｈｅａｌｉ的计算和测量结果一致。与Ｍｉｃｈｅａｌｉ的方法相比，混合法对于任意尺寸的圆柱半径与翼宽和任意的入射角都适用。