多通道PCR荧光检测仪的光学系统设计

针对目前实时定量PCR荧光检测仪系统中存在的检测效率低、体积大等问题,提出了一种基于传统单通道共聚焦型光路改善组件的方法,使激发光路和荧光收集光路共用一个大孔径透镜,并在该透镜的下方围绕多个激发光准直光路,同时在荧光收集光路中添加多个二向色镜,实现多通道荧光的同时检测。运用Code V软件设计出准直透镜和聚焦镜,将透镜数据导入到Lighttools软件中进行仿真模拟,结果表明,光学系统解决了现有实时定量PCR荧光检测仪中存在的问题,检测效率是原系统的2倍以上,体积比传统单通道集成的结构小2倍以上。     

An Interconnect Bus Power Optimization Method

A simple yet accurate interconnect parasitical capacitance model is presented. Based on this model a novel interconnect bus optimization methodology is proposed. Combining wire spacing with wire ordering, this methodology focuses on bus dynamic power optimization with consideration of bus performance requirements. The optimization methodology is verified under a 65 nm technology node and it shows that with 50% slack in the routing space, a 33.039% power saving can be provided by the proposed optimization methodology for an intermediate video bus compared to the 27.68% power saving provided by uniform spacing technology. The proposed methodology is especially suitable for computer-aided design of nanometer scale on-chip buses.     

氢气分子在沸石中的吸附模拟研究

采用巨正则蒙特卡罗方法模拟了氢气在沸石中的吸附行为,并采用Dubinin-Astakhov微孔分析方法,分析了沸石结构对储氢量大小的影响,总结了影响储氢量大小的物理因素,该工作有利于指导合理的设计与合成储存材料,为改善材料储氢能力提供了有力的理论支撑. 关键词： 储氢 吸附等温线 巨正则蒙特卡罗     

单辊旋淬法制纳米晶铜铍合金及结构分析

 采用单辊旋淬法制备出纳米晶CuBe合金,利用X射线衍射、扫描电镜以及电子能谱等分析方法对纳米晶铜铍合金进行结构分析,并与原始态的CuBe合金的相结构进行了对比。研究表明：合理的快速凝固工艺能使铜铍合金的晶粒尺寸达到30 nm左右,晶粒形貌发生变化,并且有类似CuBe的金属间化合物出现。由于铍原子加入到纯铜中,使得铜铍合金的固溶度扩大,在快速凝固铜合金中有大量细小弥散的第二相颗粒,有共析转变发生。     

SS7E机车动力学分析模型的试验验证及工程应用

基于车辆-轨道耦合动力学理论,建立了较为详细的SS7E机车在弹性结构轨道上的动力学仿真分析模型,详细的考虑了牵引电机的弹性悬挂与各部件之间的止挡.结合试验结果,对模型及其仿真计算结果进行了验证.结果表明,试验值与仿真计算值吻合良好,该模型能够用来分析SS7E机车的动力学性能.最后,针对该机车在实际运营过程中出现横向非线性异常振动现象,进行了机车二系横向减振器阻尼大小及工作状态对机车舒适性影响等方面的研究.     

基于PWM整流器双闭环控制的超导电磁储能功率调节器的研究

本文基于电压型超导电磁储能系统(Superconducting Magnet Energy Storage,简称SMES)的基本结构和工作原理,结合脉冲宽度调制(Pulse Width Modulation,简称PWM)整流器的应用,建立了三相电压型PWM整流器控制的超导电磁储能系统的数学模型.设计了具有前馈解耦控制的PWM整流器双闭环控制系统,并运用Mat-lab/Simulink仿真分析软件对基于PWM整流器的超导电磁储能双闭环控制系统进行了仿真研究.仿真结果表明PWM整流器双闭环控制策略应用于SMES电压型SMES功率控制器比直接电流控制等传统的控制策略反应速度更快,向电网注入谐波电流更小,有利于提高了电网的稳定性.     

Autostereoscopic 3D projection display based on two lenticular sheets

We propose an autostereoscopic three-dimensional (3D) projection display. The display consists of four projectors, a projection screen, and two lenticular sheets. The operation principle and calculation equations are described in detail and the parallax images are corrected by means of homography. A 50-inch autostereoscopic 3D projection display prototype is developed. The normalized luminance distributions of viewing zones from the simulation and the measurement are given. Results agree well with the designed values. The proposed prototype presents full-resolution 3D images similar to the conventional prototype based on two parallax barriers. Moreover, the proposed prototype shows considerably higher brightness and efficiency of light utilization.     

New approach for normalization and photon-number distributions of photon-added （-subtracted） squeezed thermal states

Using the thermal field dynamics theory to convert the thermal state into a "pure" state in doubled Fock space, we find that the average value of efa a under squeezed thermal state (STS) is just the generating function of Legendre polynomials. Based on this remarkable result, the normalization and photon-number distributions of m-photon added (or subtracted) STSs are conviently obtained as the Legendre polynomials. This new concise method can be expanded to the entangled case.     

Phase-sensitive nonclassical properties of photon-added-then-subtracted coherent squeezed states

We investigate the nonclassical properties of the photon-added-then-subtracted coherent squeezed state(PASCSS) via the sub-Poissonian statistics,the photon-number distribution,and the negativity of the Wigner function.It is found that the PASSCS is a superposition state of D(β)S(ζ)|0>,D(β)S(ζ)|1>,and D(β)S(ζ)|2>.We find that the Mandel Q parameter,the photon-number distribution,and the negative volume of the Wigner function of the PASCSS are all periodic functions of the compound φ-θ/2 with a period π involved with squeezing and displacement parameters.     

人造流感病毒又一潘多拉魔盒?

最近,美国和荷兰的两个研究小组称,他们借助基因工程技术,使H5N1病毒发生基因变异,产生出一种H5N1变异病毒.这种"人造流感病毒"的致病性大大增强,可以轻易在数以百万计的人群之间快速传播.消息传出,世界为之震惊.