斯特林制冷机驱动控制源电磁兼容分析与改进

介绍了斯特林制冷机驱动控制源的分类,讨论了不同的驱动方式对探测芯片产生的干扰形式,并给出了驱动控制源采取的改进措施.并对驱动控制源与斯特林制冷机联机实验所产生的干扰情况进行了分析,介绍了驱动控制源采取的有效改进措施.     

正负双极性重复频率充电电源研制

针对紧凑型高功率脉冲驱动源的重复频率充电需求,开展了基于LC全桥串联谐振原理的恒流充电技术研究,并根据紧凑型Marx脉冲功率源的工作方式开展了电源关键参数设计,完成了一种正负双极性充电的紧凑型高压电源研制,实现20 ms内对单边等效负载电容为0.15μF的双极性Marx驱动源充电至±45 kV,平均充电功率大于15.5 kW。该电源采用单个高频高压变压器实现了正负双极性高电压同步输出;采用变压器、整流电路、隔离保护电路、电压检测电路一体化绝缘封装设计,既减小了装置体积又降低了高压绝缘风险;通过隔离保护、电磁屏蔽等设计有效解决了Marx发生器放电过程中瞬时高压信号对电源控制系统的干扰和损伤。     

用于微型生化分析的光探测系统

针对微生化芯片样品剂量少和与微流体芯片集成等要求,设计了两种在芯片内用分光光度法对混合后液体的吸收光谱进行探测的方法。实验利用510～840 nm的可见光光源,采用了直接探测法和消逝波探测法对样品进行探测。通过两种方法的比较证明：直接探测法具有原理简单、消耗样品量少和结构容易实现等优点;消逝波探测法具有需要样品量极少、灵敏度高和易于集成的优点。     

不同射线能量及线衰减系数条件下体源探测效率的函数模型

基于放射性废物桶内所含介质材料和放射性核素分段均匀分布的假设, 采用蒙特卡罗程序模拟计算多种射线能量、多种样品密度条件下的线衰减系数和体源探测效率, 通过多元非线性拟合得到以线衰减系数和能量为自变量的体源探测效率函数。基于壳源法, 通过多个点源组合测试近似替代均匀体源的实验测量, 对3种能量射线和3种密度的样品进行验证实验, 利用蒙卡模拟与数值拟合结合方法和实验测量两种方式获得各自的体源探测效率, 完成活度估算。两种方式活度估算结果相对误差均小于23%。通过蒙卡模拟与数值拟合结合方法所得结果与实验结果基本吻合, 证明了该方法的有效性。     

分置式斯特林制冷机驱动控制源的抗干扰设计

电磁干扰问题一直是影响斯特林制冷机性能的重要因素,文中分别从硬件和软件两方面对斯特林制冷机驱动控制源的抗干扰设计作介绍.本设计的硬件方面主要采用驱动控制器的输出部分加装LC滤波器、电机的单极性驱动代替传统的双极性驱动和测温部分装光电隔离器等措施;软件部分主要是对采样到的信号进行数字滤波.     

辐射探测芯片吸收膜理论设计及镍磷黑膜制备

对新型条形辐射探测芯片的吸收膜层进行了理论分析,并且在金刚石材质的探测芯片上采用电镀方法制备了镍磷黑吸收膜.辐射探测芯片的膜层吸收分析表明,芯片吸收膜层的吸收率正比于表面粗糙度.通过对辐射吸收膜层设计与制作工艺的研究,制备出一种用于条形辐射探测芯片的镍磷黑吸收膜,通过测量其表面形貌结构,表明该膜层具有50nm—1.5μm范围的微结构;红外吸收测试表明其吸收率在1.4—8μm波段为0.989以上,从而提高了辐射探测芯片的性能.     

基于Marx的任意极性方波脉冲电源设计北大核心CSCD

设计了一种基于Marx电路的方波脉冲电源,该电源采用磁环隔离驱动方案与全桥Marx电路相结合,实现了正极性、负极性和双极性高压方波脉冲的输出,解决了常规脉冲电源只能输出特定极性脉冲的限制。对电路的运行模式经行了理论分析,并搭建了16级实验样机。实验结果表明:在空载条件下,实现了频率1 kHz,幅值10 kV的正极性、负极性及双极性高压方波脉冲输出。其最小脉宽1μs,极性可调。该脉冲电源结构紧凑,可以实现输出电压、脉宽、脉冲极性可调。最后使用该方波脉冲电源驱动平行板介质阻挡放电反应器。结果表明:该方波脉冲电源可以作为介质阻挡放电驱动源。     

三光窗杜瓦红外探测器抗干扰设计

文中就斯特林制冷机应用在三光窗杜瓦红外探测器组件中对红外探测器的信号产生的干扰问题进行了多方面探讨、测试及分析研究。从制冷机驱动电源入手 ,研制出了一种低干扰制冷机驱动电源 ,并对整个系统的安装调试进行了抗干扰设计 ,有效地控制了系统对探测器芯片信号产生的干扰 ,使其达到用户要求     

基于LPC2210和SSD1339的PM-OLED驱动控制电路

为了避免早期无源矩阵有机电致发光器件驱动控制电路的一些缺陷,如:"串扰"和"交叉"效应以及电路连接比较复杂,用两种方法实现了基于飞利浦公司生产的LPC2210控制芯片和晶门科技公司的SSD1339驱动芯片的驱动控制电路。首先介绍了有机电致发光器件的结构和发光原理以及芯片SSD1339和LPC2210的主要的特点;分析和比较了SSD1339的8080系列并行口和LPC2210外部存储控制单元的读写时序;分别利用LPC2210的通用输入输出单元和外部存储控制单元,成功的控制SSD1339驱动128RGB×128点阵有机电致发光屏。实验结果表明:两种方法不仅可以有效地克服早期驱动控制电路的缺陷,而且可以使有机电致发光屏显示出高质量的图片;用外部存储控制单元实现的驱动控制电路,可以实现约80 Hz的驱动帧频;而使用通用输入输出单元实现的驱动控制电路,可以单步跟踪数据的传输,因此它具有方便查错的优势。本次实验为在不同的集成环境下无源矩阵有机电致发光器件驱动控制电路的设计奠定基础。     

激光箔条云对激光导引头的干扰效果研究

激光箔条云对激光有很高的散射率,光电对抗中越来越多地采用激光箔条云作为激光无源假目标实施无源干扰,或作为激光漫反射体与激光有源干扰设备配合使用,实施激光角度欺骗干扰。基于箔条云对激光的散射原理,分析了两种干扰方式的原理,设计了激光箔条云对激光导引头的有源角度欺骗干扰实验方法,给出了所需测试设备及布站要求。结果表明,干扰效果理想。该干扰方法具有灵活、机动、快速等特点,可作为一种激光有源角度欺骗干扰的新手段。     

甚多束激光直接驱动靶面辐照均匀性研究

针对甚多束激光辐照下的直接驱动靶面光强均匀分布开展了系统研究. 利用球谐模分析选定了可实现均匀辐照的靶面弹着点极角分布, 并通过数值模拟确定了以等效48束激光直接驱动辐照下靶面三环弹着点极角位置分别为22.4°, 47.7°和73.6°. 基于特定装置构型分析了实现极向直接驱动时对各路激光指向的修正, 并对光束截面焦斑进行了优化, 实现了极向直接驱动下的靶面均匀辐照.     

Interaction-Induced Chiral Quantum States of the Ultracold Polar Molecules

The ultracold polar molecules with the tunable dipole-dipole interaction, not only would enable explorations of a large class of exotic many-body physics phenomena, but also could be used for quantum information processing. In the present paper we demonstrate that this dipole-dipole interaction can generate the degenerate chiral quantum states acting as a qubit robust against noise when the ultracold polar molecules are confined by a triangular lattice. Moreover, we also find two first-order quantum phase transitions by controlling an external driving field. One is the transition with the change of the different degenerate chiral quantum states. The other is the transition with the breaking of the degenerate quantum chiral states to the nondegenerate state. In experiment, these first-order quantum phase transitions can be detected by measuring the collective molecular population.     

Interaction-Induced Chiral Quantum States of the Ultracold Polar Molecules

The ultracold polar molecules with the tunable dipole-dipole interaction, not only would enable explorations of a large class of exotic many-body physics phenomena, but also could be used for quantum information processing. In the present paper we demonstrate that this dipole-dipole interaction can generate the degenerate chiral quantum states acting as a qubit robust against noise when the ultracold polar molecules are confined by a triangular lattice. Moreover, we also find two first-order quantum phase transitions by controlling an external driving field. One is the transition with the change of the different degenerate chiral quantum states. The other is the transition with the breaking of the degenerate quantum chiral states to the nondegenerate state. In experiment, these first-order quantum phase transitions can be detected by measuring the collective molecular population.     

场致发射显示器驱动电路研究进展及其性能研究

场致发射显示是一种新型的平板显示技术，场致发射显示器继承了传统的阴极射线管显示器的优良特性，兼有液晶等薄型平板显示器的优点，具有广阔应用前景。介绍了几种不同阴极结构的场发射显示器工作原理及相应的驱动电路，分析并比较了二极管型和三极管型两种场致发射显示器的驱动电路，对新型场致发射平板显示器的理论研究具有参考意义。     

Optimal polar image sampling

In this paper, a problem of efficient image sampling (deployment of image sensors) is considered. This problem is solved using techniques of two-dimensional quantization in polar coordinates, taking into account human visual system (HVS) and eye sensitivity function. The optimal radial compression function for polar quantization is derived. Optimization of the number of the phase levels for each amplitude level is done. Using optimal radial compression function and optimal number of phase levels for each amplitude level, optimal polar quantization is defined. Using deployment of quantization cells for the optimal polar quantization, deployment of image sensors is done, and therefore optimal polar image sampling is obtained. It is shown that our solution (the optimal polar sampling) has many advantages compared to presently used solutions, based on the log-polar sampling. The optimal polar sampling gives higher SNR (signal-to-noise ratio), compared to the log-polar sampling, for the same number of sensors. Also, the optimal polar sampling needs smaller number of sensors, to achieve the same SNR, compared to the log-polar sampling. Furthermore, with the optimal polar sampling, points in the image middle can be sampled, which is not valid for the log-polar sampling. This is very important since human eye is the most sensitive to these points, and therefore the optimal polar sampling gives better subjective quality.     

a—SITFT对TFT—AMLCD光学特性的影响

分析非晶硅晶体管（a-SiTFT）的电9学特性与薄膜晶体管－有源矩阵液晶显示（FTF－AMLCD）光学特性的内丰联系,讨论加在a-SiTFT源极上的驱动电压、a-SiTFT的寄生电容和阵列结构对TFT－AMLCD光学特性的影响。     

核电池材料及核电池的应用

核电池具有体积小、寿命长、不受外界环境影响等优点,因而在航空航天、深海、极地、心脏起搏器、微型电机等领域得到广泛地应用。核电池的发展与所用材料的发展互相促进。从同位素放射源、电能转换、密封保护的角度介绍了核电池所用材料的发展和最新研究进展,同时也介绍了核电池现有和潜在的应用领域。Nuclear battery has lots of advantages such as small volume, longevity, environal stability and so on, therefore, it was widely used in aerospace, deep-sea , polar region, heart pacemaker, micro-electromotor and other fields etc. The application of nuclear battery and the development of its materials promote each other. In this paper the development and the latest research progress of nuclear battery materials has been introduced from the view of radioisotope, electric energy conversion and encapsulation. And the current and potential applications of the nuclear battery are also summarized.     

用单片机驱动线阵CCD的探讨

本文就弥补以往用单片机产生线阵 CCD驱动时序的不足进行了探讨 ;给出了使用 AVR单片机产生驱动TCD12 0 6线阵 CCD的具体实例及相应程序。其定时关系精确 ,驱动频率达到推荐的速率     

Active particles with broken symmetry

We discuss and analyze the driving a polar active particle with a head-tail asymmetry based on the dynamics of an internal motor variable driven by an energy depot and a broken symmetry of friction with respect to the internal degree of freedom. We show that such a driving may be advantageous for driving large masses with small energy uptake from the environment and exhibits interesting properties such as resonance-driven optimal propulsion.     

Dynamics of rotating two-component Bose-Einstein condensates and its efficient computation

In this paper, we investigate the dynamics of rotating two-component Bose-Einstein condensates (BEC) based on the coupled Gross-Pitaevskii equations (CGPEs) with an angular momentum rotation term and an external driving field, and propose an efficient and accurate method for numerical simulations. We prove the conservation of the angular momentum expectation, derive the dynamic laws for the density of each component and condensate widths, and analyze the dynamics of a stationary state with its center shifted from the trap center. By formulating the CGPEs in either 2D (two-dimensional) polar coordinate or 3D cylindrical coordinate system, the angular momentum rotation term becomes a term with constant coefficients. This allows us to develop an efficient time-splitting method which is time reversible, time transverse invariant, unconditionally stable, efficient and accurate for the problem. Moreover, it conserves the total position density in the discretized level. The numerical method is applied to verify our analytical results and study the dynamics of quantized vortex lattices in rotating two-component BEC with/without an external driving field.