深蓝色OLED材料均三嗪衍生物的合成与表征

为了克服PEDOT: PSS作为空穴注入层时强酸性和低导电性的问题,采用将适量咪唑和碘化铯共掺杂于PEDOT: PSS的方法,制备了高效有机电致发光器件(OLEDs)。结果表明：有效调节PEDOT: PSS的酸碱性,可提高PEDOT: PSS的空穴注入能力,使载流子传输更加平衡。与纯PEDOT: PSS作空穴注入层的OLEDs相比,优化后器件的最大亮度和电流效率分别提高了30%和31%。该研究为掺杂PEDOT: PSS为空穴注入层在OLEDs领域的研究提供了理论和实验参考。     

交流伺服系统的高响应电流环控制

分析电压输出滞后、电流采样延时和交直轴(d-q轴)电压耦合等制约电流环带宽提高的因素,提出一种复矢量解耦的电流环预测控制算法.采用电流环预测控制算法提高电流环响应;对当前时刻电流进行采样,得到下一时刻的电压,减少电流采样延时;采用占空比双次刷新控制算法缩短电压输出滞后时间;采用复矢量解耦的方法解决d-q轴电压耦合问题,进一步提高电流环性能.结果表明:相较于比例-积分控制算法,文中方法具有更优的电流环响应性能.     

京沪大学生创业素质能力现状调查及对策建议

通过对北京和上海10所高校大学生进行调查分析,了解京沪大学生的创业意识、创业精神和创业能力.调查显示,京沪大学生整体创业素质能力较高,但也存在影响大学生创业素质能力提升的问题:创业课程培训的普及率不高,大学生缺少创业激情,创业的"坚持不懈精神"不足,创业能力中"设定目标能力"和"产融互动能力"较弱等问题.对此建议如下:高校要完善创新创业教育生态体系;提升大学生创业心理资本水平;建立产学助创协同育人机制;培育基于地域文化的创新创业文化.     

Special variation of infiltration-growth processed bulk YBCO fabricated using new liquid source: Ba3Cu5O8 (1:1.3) and YbBa2Cu3Oy

Utilization of novel materials, particularly high-Tc (critical temperature) superconductors, is essential to pursue the United Nations' Sustainable Goals, as well as to meet the increasing worldwide demand for clean and carbon-free electric power technologies. Superconduct-ing magnets are beneficial in several real-life applications including transportation, energy production, magnetic resonance imaging (MRI), and drug delivery systems. To achieve high performance, one must develop uniform, large-grain, infiltration-growth (IG) processed bulk YBa2Cu3Oy (Y-123) super-magnets. In this study, we report the magnetic and microstructural properties of a large-grain, top-seeded, IG-pro-cessed Y-123 pellet, which is 20 mm in diameter and 6 mm in height; the pellet is produced utilizing liquid Yb-123+Ba3Cu5O8 as the liquid source. All the samples cut from the top of the bulk exhibit a sharp superconducting transition (approximately 1 K wide) with the onset Tc of approximately 90 K. However, in the samples cut from the bottom surface, the onset Tc values slightly decreased to between 88 and 90 K, al-though still exhibiting a sharp superconducting transition. The top and bottom samples exhibited the highest remnant value of Jc (critical cur-rent density) at 77 K H//c-axis of 50 and 55 kA/cm2, respectively. The remnant Jc and irreversibility field values significantly fluctuated, being fairly low in some bottom samples. Scanning electron microscopy identified nanometer size Y-211 (Y2BaCuO5) secondary-phase particles dis-persed in the Y-123 matrix. Energy-dispersive spectroscopy clarified that the decreased both Tc and Jc for the bottom samples were attributed to liquid phase dispersion within the Y-123 phase.     

抓住本质 拓宽楞次定律的表达形式

由楞次定律的感应电流的效果总与引起感应电流的原因相对抗的本质,得出楞次定律的几种表述及其应用。     

毕奧-沙伐尔定律与稳恒磁场方程

毕奥-沙伐尔(Biot-Savart)定律定量概括了稳恒电流元矢量产生磁场的规律,同时又描绘了稳恒电流磁场的分布特征.因此,毕奥-沙伐尔定律成为稳恒磁场方程的重要理论基础.     

光激瞬态电流谱方法中激发光强度等因素对结果的影响

本文讨论了用光激瞬态电流谱测量半绝缘材料中深能级时,所加电压的极性、光强的变化等因素对结果的影响。对Martin等人提出的判断陷阱类型的方法进行了分析,在此基础上提出了一种新的方法。并给出了由光强变化而引起的能级位置的测量误差的修正方法。     

昆虫复眼的研究现状

从形态学、生理学、光学、仿生学和计算机模拟、分子生物学等方面对昆虫复眼研究的现状 进行了简要综述.     

上海市工业危险废物现状调查及管理对策研究

针对上海市工业危险废物产生及处置现状,提出促进企业清洁生产,实现废物减量化;严格执行危险废物申报登记,加强信息化管理,加强监督管理持证企业;加强危险废物集中处置场建设,降低运行成本;加强技术政策的制定与处理、处置技术的研究开发,真正实现工业危险废物全过程管理等建议.     

电动阀门的过流限扭控制

通过对异步电机堵转电流的研究分析,得出阀门过扭与过扭电流的对应关系。通过检测并识别定子电流方法,对电动阀门实施过扭控制。在 DFD-I型阀门电动装置中应用这种控制方法,获得满意的效果。