中药柴胡中K、Ca、Zn、Fe和Mn含量测定及清除自由基机制分析

研究了柴胡中金属元素的作用为治疗呼吸系统疾病提供依据.选取柴胡粉碎、干燥至恒重,采用HNO3-HClO4湿法消化,用原子吸收分光光度计测定宏量元素钙、钾和微量元素铁、锰、锌的含量.测定结果表明,柴胡中含有丰富的金属元素.用原子吸收分光光度法测定中草药中金属元素含量,方便迅速.结果准确,测定结果为临床上合理利用柴胡清除自由基、预防和治疗呼吸系统疾病提供科学依据,也为大力开发、利用中药柴胡提供了有用的数据.     

空间光束实时捕获、跟踪实验与分析

提出一种空间光束捕获、跟踪设计方案,在实验室条件下实现其主要功能,并对其定位精度和实时性进行了分析,结果表明：信标光定位处理的时间为25 ms,角度测量的相对误差为1.3％,显示出良好性能.同时,为由理论分析到实际星载PAT系统提供试验依据.     

HL-2A 装置的边缘参数测量

HL-2A 装置中平面边缘的等离子体特性通过磁力传动的马赫/ 雷诺协强/ 朗缪尔10 探针组进行了研究。10 探针组安装在可径向向里和向外移动, 并可绕轴旋转360^o 的传动杆上, 用于测量主等离子体边缘的温度、密度、悬浮电位、空间电位、径向和极向电场、湍流的雷诺协强、径向和极向等离子体流速及其径向分布。HL- 2A 装置的实验结果表明, 边缘等离子体扰动诱发的雷诺协强产生了边缘极向流; 雷诺协强的径向梯度驱动带状流抑制了湍流输运。     

Why Matter Occupies so Large a Volume？

The paper represents a rigorous treatment of the underlying quantum theory, not just in words but providing the underlying technical details, as to why matter occupies so large a volume and its intimate connection with the Pauli exclusion principle, as more and more matter is put together, as well as of the contraction or shrinkage of ＂bosonic matter＂, upon collapse, for which the Panli exclusion is abolished. From the derived explicit bounds of integrals of powers of the particle number densities, explicit bounds on probabilities of the occurrences of the events just described are extracted. These probabilities lead one to infer the change of the ＂size＂ or extension of such matter, upon expansion or contraction, respectively, as their content is increased.     

氩-氮混合气电感耦合等离子体在元素和同位素分析中的应用进展

在传统Ar等离子体中引入其他活性气体(如氮气等)已经成为拓展其分析性能的一种重要手段。本文较系统的阐述了Ar-N₂混合气体电感耦合等离子体的基本物理化学性质,从N₂气引入引起传统Ar-ICP基本物理化学参数变化的层面出发探讨了Ar-N₂混合气等离子体特殊性质产生的机制,回顾了Ar-N₂混合气电感耦合等离子体在质谱分析中近40年的应用成果,并且展望了该技术在未来元素和同位素分析领域的应用前景。     

Enhancement of free space optical link in heavy rain attenuation using multiple beam concept

Free space optics (FSO) has attracted a lot of attention for a variety of applications in telecommunications area, and it is dream of every researcher and telecommunication society to make it a real alternative solution for the last mile problem, to replace fiber optics. FSO is much preferred because of its low maintenance cost and deployment time. FSO with single-beam system is vulnerable to atmospheric attenuation, so to overcome this, a multiple-beam FSO transceiver system has become prominent and is usually used. In this paper, average rain attenuation is evaluated from the collected rain intensity data which are collected for a period of seven months, and implemented in the study concerning results relating link distance, and received optical power of using multiple-beam FSO system in tropical rainy weather. Comparison is made in terms of received optical power, geometrical losses, atmospheric losses, and bit error rate (BER) on using different number of optical beams, based on simulation at data rate of 1 Gb/s. From the results it is clear that the quality of received power is improved by using up to four beams, along with link distance up to 1141.2 m as compared to one-beam, two-beam, and three-beam, with link distances 833.3 m, 991.0 m, 1075.4 m, respectively.     

高效率的蓝色磷光有机电致发光器件

制备了基于双母体结构的高效率蓝色磷光有机电致发光器件。通过与采用单母体结构和双发光层结构的器件性能进行对比,发现双母体结构的应用对蓝光器件的性能起到了明显的提升作用。双母体蓝光器件的最大效率为14.9 cd/A(13.3 lm/W),最大亮度达到10 440 cd/m~2,其开启电压仅为2.7 V。蓝光器件同时展示出低的效率滚降特性,在100~5 000 cd/m~2范围内,器件的效率滚降仅为35.3%。在3~8 V的电压变化内,器件的色坐标一直位于蓝光区域。     

功率型白光LED的非线性混合调光方法

分析脉冲宽度调制(PWM)双通道输出白光LED的混合调光方法,建立PWM与混合光源输出的光通量和色温之间变化关系的非线性数学模型。基于Zig Bee无线通信模块CC2530作为双路PWM输出,控制以SN3350为核心的LED恒流驱动电源,完成占空比可调的暖白和冷白两路白光LED的色温和光通量混合调光控制系统设计,并通过高精度快速光谱辐射计HAAS-2000测试系统进行测试。实验结果表明,双路PWM能够较好地实现对LED色温和光通量的输出大小进行控制,混合光源相关色温在3 250~15 000 K范围内连续可调。理论计算与系统控制的光通量和色温存在的相对误差分别小于1.70%和8.50%。     

Characteristics of Ti0.97Co0.03O2:Sb0.01 dilute magnetic semiconducting thin films deposited at 500 °C by pulsed laser deposition

Epitaxial Ti_0.97Co_0.03O₂:Sb_0.01(TCO:Sb) films were deposited on R-Al₂O₃ (1 1 0 2) substrates at 500 °C in various deposition pressures by pulsed laser deposition. The solubility of cobalt within the films increases with decreasing deposition pressure at a deposition temperature of 500 °C. The TCO:Sb films deposited at 5×10⁻⁶ Torr exhibit a p-type anomalous Hall effect having a hole concentration of 6.1×10²²/cm³ at 300 K. On the other hand, films deposited at 4×10⁻⁴ Torr exhibits an n-type anomalous Hall effect having an electron concentration of about 1.1×10²¹/cm³. p- or n-type DMS characteristics depends on the change of the structure of TCO:Sb films and the solubility of Co is possible by controlling the deposition pressure.     

装备电子设备边界扫描系列标准及测试性设计技术研究

随着新一代电子产品的复杂化和密集程度的不断提高,电路和系统的可测试性急剧下降,传统测试技术已经不能满足需要。针对我国军用电子设备的测试及诊断工作需求,通过对IEEE1149系列边界扫描测试标准进行了研究分析,分析各标准的特征范围、适用对象、各标准相互关系,可以分析梳理IEEE1149标准在我国军用电子设备测试性设计中的可行性和适用性,探索得到将边界扫描技术在测试性设计上的应用思路。将边界扫描技术应用于电子设备不同范围的测试设计,能有效地解决传统测试性设计的问题,能够提升诊断能力,缩减产品生产周期及研制费用。