针辊式高压静电分选机电晕极结构优化

为提高针辊式高压静电分选机的分选效率,须寻求最佳的电晕极结构. 利用自制针辊式高压静电分选机,固定针辊距离为d=50 mm,进行针辊放电实验. 通过调整电晕电压、放电针间距及长短针排列方式,探讨分选电场分布规律,对针结构进行优化. 结果表明,放电效果随针间距减小会出现先增强后减弱的过程,当针间距为12 mm时达到最大值;在最佳针间距下,将针的长度按30 mm-15 mm-30 mm的方式排列,得到了更好的放电效果,转辊表面电荷量在15 kV时可提高33%;应用Matlab软件,模拟了不同针间距对放电的影响,为静电分选机的优化设计提供了依据.      

Towards mass applications: A review on the challenges and developments in metallic bipolar plates for PEMFC

The industrial applications of proton exchange membrane fuel cell (PEMFC) technology have attracted tremendous capitals and research attention in the last ten years. However, there are still many bottlenecking problems before the progress triumphs. Among them, a core challenge is the improvement of bipolar plates (BPs). As a key component of PEMFC, the BPs undertake the crucial functions of distributing reactant gases and cooling medium, collecting the electricity generated, exporting waste products, etc. Due to the unique advantages of ultra-thin, high strength, easy-to-mass-produce, etc., metallic BPs have been considered as the promising solution for the automotive and aerospace application scenarios with a strong requirement of power density. However, many challenges remain to be conquered in metallic BPs to fully meet all the requirements in those industrial applications such as corrosion, toxic ion emission and fabrication. The aim of this work is to provide an overview of the important researches in recent years dealing with the most critical problems of metallic BPs before industrial applications. The future studying directions in material and processing methods development are also given towards the wide application of metallic BP PEMFCs.     

基于ARM的暖房温度控制暨双极性PID控制算法设计

基于ARM控制器,设计双极性PID控制算法,实现对暖房温度的控制. PID输出正极性用电热炉加热,输出负极性用风扇冷却. PID运算采用位置型,并使用梯形积分、积分分离、微分延迟、输出限幅等多种算法,对参与运算的输入输出信号做归一化处理,从而更准确地观察P、I、D运算分量并指导参数整定.测定广义被控对象的数学模型,对象为大惯性、大滞后对象,并且升降温时惯性大小不一样.在实际运行中,当设定值正向阶跃时,超调量较小,稳态误差为±0. 2℃;反向阶跃时,无超调,稳态误差为±0. 1℃.     

Why endophenotype development requires families

Endophenotypes are heritable quantitative traits that are associated with disease liability, can be measured in both affected and unaffected individuals, and provide much greater power to localize and identify risk genes for mental illness than does affection status alone. Traditionally, endophenotypic markers for psychiatric illnesses include in vivo neuroanatomic and functional magnetic resonance imaging measurements and indices of neurocognitive abilities. However, neurocognitive and neuroimaging measure...     

紫外光电探测器的原理及其广泛应用

阐述“光电测雹仪”和“光电测晕仪”2种紫外光电探测器的探测原理和实际应用，该仪器分别能接收积雨云中闪电的紫外光和高压线圈表面的电晕放电中的紫外光，利用快速记录到的波来鉴别是否中冰雹云测量高压线圈的起晕电压，这对气象部门指挥人工防雹作业和电气工业部门检测发电机内部线圈的产品质量具有重要意义，此外，还列举了紫外光电探测器在其他领域内广泛的开发应用前景。     

关于冠图的关联着色

证明“每个GL科能用Δ＋2各颜色进行关联着色的ICC猜想对一些图图是成立的。     

否定非对合剩余格的双极值模糊理想格

对否定非对合剩余格的双极值模糊理想问题做进一步深入研究,给出了由一个双极值模糊集生成的双极值模糊理想的定义并建立了其两个表示定理,证明了一个否定非对合剩余格L的全体双极值模糊理想之集BFI(L)在偏序下构成完备Heyting代数,为进一步揭示否定非对合剩余格的结构特征拓展了研究思路。     

改进基板修饰方法制备有机/无机分子沉积膜

把氢烷偶联剂〖（ＣＨ３Ｏ）３（Ｓｉ（ＣＨ２）３ＳＨ〗直接组装在石英基板上，随后将有机膜的端疏基（ＳＨ）原位氧化为磺酸基（ＳＯ３Ｈ），再利用其负电笥表面交潜沉积上双季铵盐和ＷＯ３（ｅ＾－０，制得多层有机／无机分子沉积膜，经紫外可见光谱及小角Ｘ射线衍射表征，该膜具有良好的超薄层状有结构。     

新型封闭室内空气净化技术研究

用横向线－网电极结构，负高电压供电来产生对人体健康有利的负离子；用电晕线加方法来降低对人体健康不利的臭 氧浓度和提高室内负离子浓度。