Growth and characterization of La3Ga5.5Ta0.5O14 crystal

La₃Ga_5.5Ta_0.5O₁₄ (LGT) crystal was grown by using the Czochralski method. The as‐grown crystal is transparent, free from inclusions and with no cracks. Specific heat, thermal expansion, dielectric constants, transmission spectrum and optical damage threshold of LGT have been measured, and the results show general properties of LGT are similar to that of La₃Ga₅SiO₁₄ (LGS) crystal. The experiment to research the Q‐switch properties of LGT has been performed and the results show LGT possesses smaller electrooptic coefficients than that of LGS and may not be an ideal material used as a Q‐switch. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

脉冲压缩系统中气体开关对功率增益的影响

 对高功率微波脉冲压缩系统中气体开关对功率增益的一些重要影响进行了较详尽的理论分析,包括气体开关在导通过程中吸收微波能量,等离子体瞬间功率损耗使得谐振腔固有品质因数的下降,开关导通后等离子体并非理想良导体等,并将这些影响用修正系数来加以体现,对原有的用微波等效电路理论推导出的功率增益公式加以修正,使得理论公式的精确度由原来的60%提高至约85%。     

等离子体断路开关和电感负载间的功率流特性

利用PIC (particle-in-cell) 方法,结合实验装置的几何结构和实验结果,采用动态开关模型,对微秒等离子体断路开关和电感负载间的功率流特性进行了研究。模拟得到了与实验结果符合较好的开关电压和负载电流波形,并给出了开关下游出现的稀薄等离子体的密度(约1012 cm-3)和速度(约1 cm/ns), 同时也得到了开关下游的空间电流分布。模拟结果表明,开关下游的结构应避免阻抗突变以减少电流损失,同时提高开关阻抗可有利于提高负载上的最大功率。     

Photo‐/Baso‐Chromisms and the Application of a Dual‐Addressable Molecular Switch

Two typical molecular switches of spiropyran (SP) and benzoxazine (OX) were fused by sharing an indole to achieve a new dual‐addressable molecular switch (SP‐OX‐NO₂). Through proper molecular modification with NO₂, the transformation from merocyanine (MC) to ring‐closed SP or ring‐closed OX can be controlled separately with visible light or base stimuli in solution, respectively, and these processes are verified by UV‐vis and NMR spectroscopy as well as control experiments. The cis‐merocyanine (cis‐MC) form is involved in the basochromic process in solution. DFT calculation suggests that the bidirectional switching property of the fused SP‐OX molecular switch can be controlled separately, when the OX isomer is more stable than the deprotonated SP isomer. Because of the significant color variations in solution, the simple dual‐addressable switch has been further successfully applied to construct a multicolor reversible display on paper.     

阀切换-离子色谱法测定1,2-环氧丁烷产品中有机酸

建立了阀切换-离子色谱法测定1,2-环氧丁烷（1,2-BO）产品中有机酸（甲酸、乙酸和丙酸）的方法。样品经乙醇稀释后,通过阀切换技术,有机酸被IonPac TAC-ULP1捕集柱捕集,然后进入IonPac AS11分析柱分离,并由电导检测器检测。结果表明：甲酸、乙酸和丙酸均能实现较好地分离,在各自的范围内其色谱峰面积呈现良好的线性关系。实际样品的加标回收率为92.5%~111.8%,相对标准偏差小于5.6%（n=3）,检出限为0.60~4.80 μg/L。该方法具有前处理简单、快速、准确等特点,适用于不溶于水的有机体系中有机酸的分析。     

Magnetically Controlled Electronic Transport Properties of a Ferromagnetic Junction on the Surface of a Topological Insulator

We have investigated the transport properties of the Dirac fermions through a ferromagnetic barrier junction on the surface of a strong topological insulator.The current-voltage characteristic curve and the tunneling conductance are calculated theoretically.Two interesting transport features are predicted:observable negative differential conductances and linear conductances tunable from unit to nearly zero.These features can be magnetically manipulated simply by changing the spacial orientation of the magnetization.Our results may contribute to the development of high-speed switching and functional applications or electrically controlled magnetization switching.     

一种用于数字助听器的WOLA滤波器组的设计准则

针对WOLA(weighted overlap-add)滤波器组在数字助听器多通道处理中的应用,本文提出了一个满足该领域要求的具体的设计准则。根据这一准则,可用窗函数法进行滤波器设计,并把问题简化为对窗长度的选取。对线性扫频信号和语音信号多通道放大两种情况进行了仿真,结果表明,适当选取窗长度,滤波器组输出信号将符合要求并且无混迭。     

基于腔QED的多用户间的多原子量子信道的建立

提出基于腔QED技术的多用户间的多原子W态和GHZ态量子信道的建立方案.在量子网络的空闲时段,各个用户和量子交换机共享EPR对.量子交换机通过原子和腔场的相互作用将两个EPR对制备成W态,再与另一个EPR对进行纠缠交换,经过直接测量后为用户建立三原子W态量子信道;同时讨论了四用户间的W态量子信道的建立方案.量子交换机对三个EPR对进行纠缠交换,将三个原子同时与腔场作用,经过直接测量后为用户建立三原子GHZ态量子信道;并将此方法推广到N个用户间的GHZ态量子信道的建立. 关键词： 腔QED 量子信道 量子交换机 纠缠交换     

激光触发开关的电参数测量

 为进行PTS装置单路样机激光触发开关的调试,设计安装了相应的电压电流探头。通过对比分析了探头测量结果,解释了开关出口D-dot电压探头波形畸变的原因,并运算得到了正确的波形。B-dot探头得到了与模拟结果符合的电流微分信号和电流信号。实验结果表明： D-dot探头适合MV量级的高电压脉冲测量,但当该探头工作在开关区时,设计中需要对比探头与被测电极以及其它电极的结构电容,只有满足结构电容远大于与其它高压电极的电容时,才能获得较真实的信号。如果结构设计中难以满足该要求,可以采用软件处理方法得到正确的波形。使用B-dot探头输出的电流微分信号可以较为准确地得到开关导通延迟时间,测量误差小于0.7 ns。     

基于半导体断路开关的8 MW,10 kHz脉冲发生器

 功率器件半导体断路开关具有高重复频率工作能力。采用高速绝缘栅双极晶体管组件作为初级充电回路的主开关,建立了一台工作频率为10 kHz的脉冲发生器。脉冲发生器采用磁饱和脉冲变压器、磁开关及高压脉冲电容器组等固态器件进行两级脉冲压缩,产生小于100 ns的电流脉冲,对半导体断路开关进行泵浦,半导体断路开关反向截断泵浦电流在负载上产生高压脉冲输出。实验装置在电阻负载上得到了脉冲输出功率约为8.6 MW,脉冲宽度约10 ns,重复频率10 kHz的高压脉冲输出。