PH，PD分子基态（X^3∑^-）的结构与势能函数

本文采用量子力学从头算方法，运用电相关单双耦合CCSD（T）／6—311＋＋G（3df，2pd）和QCISD（T）／6—311＋＋G（3df，2pd）研究了PH、PD分子基态的结构与势能函数，计算出了这些分子的光谱数据（ωe、ωeχe、Be、αe、De），结果与实验光谱数据吻合较好．这表明上述分子基态的势能函数可用经修正的Murrell-Sorbie＋c6函数来表示．     

用原位漫反射红外光谱研究升温速率对HMX炸药热分解过程的影响

传统研究材料热稳定性的方法包括热失重（TG）（热介电法、热电阻）、真空安定性（VST）、差热分析（DTA）、差示扫描量热法（DSC）等。其中，TG是测量炸药重量变化与温度的函数关系，ST是测量真空状态下炸药热分解所产生的气体量，DTA和DSC是测量炸药在不同温度下，由于发生相变所表现出的变化（吸热或放热）。以上这些方法得到的是炸药热性质的宏观信息，而无法反映炸药在不同温度下的微观化学变化。原位红外光谱法是一种新兴的动态研究方法。该方法结合ir原位实时监控和红外光谱精确分析物质化学结构的优点，通过实时跟踪材料在不同温度下的化学变化，测定材料的微观结构与温度的关系。     

CaH，CaD分子的结构及其基态（X^2∑^＋）势能函数的理论研究

采用量子力学从头算方法，运用二次组态相互作用方法QCISD（T）结合6—311＋＋G（3df，2pd）基组对CaH，CaD分子基态进行了几何结构优化、计算出了它们的光谱数据（ωe、ωeχe、Be、αe、De），结果与实验光谱数据吻合较好，表明上述分子基态的势能函数可用Murrell—Sorbie函数来表示．     

Linux的进程地址空间研究

本文研究了Linux进程的虚拟地址空间管理，包括页表结构、内存分配策略、线性地址区间结构，线性地址到物理地址的映射等。     

用ab initio方法计算NaLi分子基态（X^1∑^＋）的势能函数及光谱常数

运用原子分子群表示方法，首先确定NaLi分子的电子基态（X^1∑^＋）．然后选用6—311＋＋G（3df，2pd）基组优化计算得到NaLi分子基态（X^1∑^＋）的平衡结构和离解能，采用电子相关QCISD（T）方法结合6—311＋＋G（3df，2pd）基组对NaLi分子基态进行单点能扫描计算．最后用单点扫描计算值结合优化计算所得参数去拟合Murrell—Sorbie函数，得到了NaLi分子基态的势能函数．用该势能函数计算的光谱常数与实验结果符合得很好，表明拟合确定的势能函数能精确地描述基态NaLi分子的结构和性质．     

自适应算法在极光系统参数估算中的应用

讨论带参数的自适应时域方法计算极光系统的参数,以一个有理形式函数模型来代表系统函数,采用可以在线实时应用的递推自适应算法来确定该模型的参数。利用这种方法处理测量所得的极光亮度数据,现用互谱方法计算的氧原子「ＯＩ３２」跃迁时Ｏ（＾１Ｓ）态的平均有效寿命符合得很好。     

第一性原理研究GaP的电子结构和光学性质

利用基于密度泛函理论（DFT）,采用赝势平面波方法和广义梯度近似法(GGA)研究了闪锌矿ZB结构和盐岩RS结构GaP的基态电子结构、光学性质,根据能带理论初步研究GaP基态能带结构、总态密度（DOS）和分波态密度（PDOS）,并计算出吸收系数,反射率,复介电函数,复折射率及能量损失函数。     

利用Excel对学生成绩进行统计分析

本文介绍如何用Excel中的统计函数对学生成绩进行统计分析、管理，重点说明了几个常用统计函数在学生成绩管理中的应用，如，平均值函数AVERAGE、条件统计函数COUNTIF、标准差统计函数STDEV、最大（最小）值函数MAX（MIN）等。     

FPGA＋DSP实时信号处理系统在ONT当中的应用

APON系统中的光网络终端（ONT）作为一个智能的宽带网络终端是实现光纤入户的重要设备。根据此设备接入业务复杂，通信速率快的特点，本文结合ONT的具体研制工作，提出了采用DSP FPGA的方法，来完成ONT所需要的实时信号处理功能的方案。     

第一性原理研究GaP的电子结构和光学性质

利用基于密度泛函理论（DFT）,采用赝势平面波方法和广义梯度近似法(GGA)研究了闪锌矿ZB结构和盐岩RS结构GaP的基态电子结构、光学性质,根据能带理论初步研究GaP基态能带结构、总态密度（DOS）和分波态密度（PDOS）,并计算出吸收系数,反射率,复介电函数,复折射率及能量损失函数。     

Theoretical analysis and simulation of conjugate heights for dual-conjugate AO system in lidar

A multi-conjugate adaptive optics （MCAO） can offer a possibility of widening field of view （FOV） characterized by the isoplanatic angle, and the choose of conjugate height becomes a basic problem for MCAO, which influences the size of iosplanatic angle. Considering the application of lidar, the isoplanatic angle＇s expressions of two deformable mirrors （DMs） MCAO for uplink and downlink are deduced. The effects of conjugate heights for dual-conjugate AO are thoughtfully discussed, and the isoplanatic angles are further analyzed. The results show that the isopanatic angle varies with the conjugate height and reaches the maximum as the conjugate height is at the optimal altitude. Moreover, the optimal conjugate height changes with the propagation distance.     

Quick single-photon detector with many avalanche photo diodes working on the time division

Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system.A new idea is put up to design a quick single-photon detector.This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs).Au of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal.The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector.The single-photon prompt detection can come true for high repetition-rate pulses.The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use.     

Characterization of PolyA and PolyC mismatches by Raman spectroscopy

A.C mismatches are studied by Raman spectral characterization of PolyA, PolyC, and their equimolar complex in solution of 0.14 mol/L Na ,pH7.0.Experimental results show that A·C mismatches occur to be A/B (mainly A) conformers, and unlike Watson-Crick base pairing, this kind of mismatches is stabilized by only one hydrogen bond involving cytosine N4H2 and adenine N7.The formation of A·C complex makes the base stacking interactions much stronger, and conformation of the backbone more ordered, which leads to obvious Raman hypochromic effect with some shifts in corresponding bands.     

Improvement of four-wave mixing-based wavelength conversion efficiency in dispersion shifted fiber by 40-GHz clock pumping

40-GHz clock modulated signal as a pump to improve the efficiency of four-wave mixing (FWM)-based wavelength conversion in a 26.5-km dispersion shifted fiber (DSF) is investigated. The experimental results demonstrate that the conjugated FWM component has higher intensity with the clock pumping than that with the continuous-wave (CW) light pumping. The improvement of FWM-based wavelength conversion efficiency is negligible when the pump power is less than Brillouin threshold. But when the pump power is greater than Brillouin threshold, the improvement becomes significant and increases with the increment of pump power. The improvement can increase up to 9 dB if pump power reaches 17 dBm.     

Multi-pulse operation of a Kerr-lens mode-locked femtosecond laser

Our experimental results show that the presence of a proper amount of negative group velocity dispersion is essential to multi-pulse operation of a Kerr-lens mode-locked femtosecond laser. We demonstrate that the pulse separations and the number of pulses contained within a cavity round trip are strongly dependent on the initial perturbations. The results allow us to get a better understanding on the influences of the convoluted self-phase modulation and intra-cavity dispersions on the stable multi-pulse oscillation in a Kerr-lens mode-locked femtosecond laser.     

Propagation of Helmholtz-Gauss beams in weak turbulent atmosphere

Based on the Rytov approximation of light propagation in weak turbulent atmosphere,the closed-form expressions of field and average irradiance of each one of the four fundamental families of Helmholtz-Gauss (HzG)beams:cosine-Gauss beams,stationary Mathieu-Gauss beams,stationary parabolic-Gauss beams,and Bessel-Gauss beams,which are propagating in weak turbulent atmosphere,are obtained.The results show that the field and average irradiance can be written as the product of four factors:complex amplitude depending on the z-coordinate only,a Ganssian beam.a factor of complex phase perturbation induced by atmospheric turbulence,and a complex scaled version of the transverse shape of the non-diffracting beam.The effect of weak atmospheric turbulence on irradiance distribution of the HzG beam can be ignored.     

An effective method for reducing speckle noise in digital holography

An effective method for reducing the speckle noise in digital holography is proposed in this paper.Different from the methods based on classical filtering technique,it utilizes the multiple holograms which are generated by rotating the illuminating light continuously.The intensity images reconstructed by a series of holograms generated by rotating the illuminating light possess different speckle patterns.Hence by properly averaging the reconstructed intensity fields,the speckle noises can be reduced greatly.Experimental results show that the proposed method is simple and effective to reduce speckle noise in digital holography.     

Influence of purity of HfO2 on reflectance of ultraviolet multilayer

The impurities in two kinds of HfO2 materials and in their corresponding single layer thin films were determined through glow discharge mass spectrum technology and secondary ion mass spectrometry(SIMS) equipment respectively.It was found that ZrO2 was the main impurity in the two kinds of HfO2 either in the original HfO2 materials or in the electron beam deposited films.In addition,the difference of Zr content in the two kinds of HfO2 single laver films was much laxger than that of the other impurities such as Ti and Fe.which showed that it was just ZrO2 that made the difference between the optical performance of the film products including the two kinds of HfO2.With these two kinds of HfO2 and the same kind of SiO2.we deposited HfO2/SiO2 multilayer reflective coatings at the wavelength of 266 nm.Experimental results showed that the reflectances of these two mirrors were about 99.85% and 99.15% respectively,which agreed well with the designed results what were based on the optical constants obtained from the corresponding single layer thin films.     

Speech enhancement by array crosstalk resistant ANC and spectrum subtraction

Microphone array-based speech enhancement has great importance for speech communications and speech recognition. To reduce the aperture of the microphone array and to increase the effect of the speech enhancement will greatly broaden the application areas of the microphone array. An array crosstalk resistant adaptive noise cancellation method is therefore presented. And then an improved spectral subtraction algorithm is further cascaded to obtain better enhancement results. Theoretic analysis and experiments indicate that the proposed scheme needs only a very small microphone array while it simultaneously achieves a higher SNR improvement. Besides, the proposed scheme can be used in many noisy environments and is easy for real-time implementation.