四频差动激光陀螺中差分损耗的探讨

理论分析了四频差动激光陀螺中由于镜片的Ｓ－Ｐ相位和Ｑ的各向异性及光束不过水晶片光轴等因素所引起的左、右旋偏振模式间的差分损耗。这种差分损耗会导致激光陀螺中零漂的形成。这一问题的研究对陀螺性能的改进具有重要的参考价值     

用Chirp—z变换获得雷达目标回波波形特征

探讨了高分辨率雷达视频回波波形特征．提出对回波信号作Ｃｈｉｒｐ－ｚ变换，以提高频谱的分辨率．还对两类实测毫米波高分辨率雷达目标回波波形进行了Ｃｈｉｒｐ－ｚ变换及Ｆｏｕｒｉｅｒ变换，并对两类结果进行了比较，结果证明对雷达回波波形作Ｃｈｉｒｐ－ｚ变换获得的视频波形特征既满足同一目标特征稳定性，又容易区分两类不同目标．     

Analysis of fMRI data using improved self-organizing mapping and spatio-temporal metric hierarchical clustering

The self-organizing mapping (SOM) and hierarchical clustering (HC) methods are integrated to detect brain functional activation; functional magnetic resonance imaging (fMRI) data are first processed by SOM to obtain a primary merged neural nodes image, and then by HC to obtain further brain activation patterns. The conventional Euclidean distance metric was replaced by the correlation distance metric in SOM to improve clustering and merging of neural nodes. To improve the use of spatial and temporal information in fMRI data, a new spatial distance (node coordinates in the 2-D lattice) and temporal correlation (correlation degree of each time course in the exemplar matrix) are introduced in HC to merge the primary SOM results. Two simulation studies and two in vivo fMRI data that both contained block-design and event-related experiments revealed that brain functional activation can be effectively detected and that different response patterns can be distinguished using these methods. Our results demonstrate that the improved SOM and HC methods are clearly superior to the statistical parametric mapping (SPM), independent component analysis (ICA), and conventional SOM methods in the block-design, especially in the event-related experiment, as revealed by their performance measured by receiver operating characteristic (ROC) analysis. Our results also suggest that the proposed new integrated approach could be useful in detecting block-design and event-related fMRI data.      

斯托克斯光种子法固体相干反斯托克斯拉曼频移器的理论研究

以波动方程和受激拉曼散射(SRS)物质方程为基础,采用光种子法,建立了固体相干反斯托克斯拉曼频移器的归一化耦合波方程,研究了晶体中反斯托克斯光转换效率。在脉冲抽运条件下分析了归一化增益系数G、归一化相位失配系数ΔK以及一阶斯托克斯光种子的归一化光场振幅ψs0三个变量对固体相干反斯托克斯拉曼频移器的影响,并作出了一系列相应曲线,由所得曲线估算了各归一化变量的合理取值范围。分析结果表明,在ΔK=0时,通过增大sψ0来打破拉曼增益抑制的影响,其转换效率峰值可达到44%。而当sψ0较弱时,可选取合适的相位失配系数,反斯托克斯光转换效率可达40%。     

表面形变精密测试方法的研究

本文在试样的表面制作出等间隔的平行线，作为反射式光栅，在激光束的照射下形成一列线阵分布的衍射光斑，并用线阵电荷耦合器件等组成的系统，测试衍射光斑间距及其变化量，从而高精度（μｍ量级）的为材料表面形变，应变等的测试，开发了一种具有近代光学测量的新技术。     

软件无线电与移动通信

文章介绍了软件无线电的概念、特点及其在移动通信中的应用,并对软件无线电的关键技术及其发展方向作了详细分析。     

光纤光参量放大增益特性的研究

分析了光纤光参量放大过程泵浦光与信号光的非线性相互作用，得到信号光增益G_s。进一步分析G_s，获得其增益带宽特性，只有在泵浦波长大于光纤零色散波长时才有增益，带宽约为50nm。     

远红外加热工作波段及辐射源温度的选择

在远红外加热过程中，被加热物料对红外辐射的吸收遵从吸收定律，本文从这一律出发，分布了对于不同的加热对象和加热目的，如何选择最佳工作波段和辐射源浊国度，才能达到节能和加热效果好等目标。     

High-Performance Al–Sn–Zn–In–O Thin-Film Transistors: Impact of Passivation Layer on Device Stability

We fabricated high-performance thin-film transistors (TFTs) with an amorphous-Al–Sn–Zn–In–O (a-AT-ZIO) channel deposited by cosputtering using a dual Al–Zn–O and In–Sn–O target. The fabricated AT-ZIO TFTs, which feature a bottom-gate and bottom-contact configuration, exhibited a high field-effect mobility of 31.9 $ hbox{cm}^{2}/hbox{V}cdothbox{s}$, an excellent subthreshold gate swing of 0.07 V/decade, and a high $I_{{rm on}/{rm off}}$ ratio of $≫hbox{10}^{9}$, even below the process temperature of 250 $^{circ}hbox{C}$. In addition, we demonstrated that the temperature and bias-induced stability of the bottom-gate TFT structure can significantly be improved by adopting a suitable passivation layer of atomic-layer-deposition-derived $hbox{Al}_{2} hbox{O}_{3}$ thin film.      

Multifunctional Electrode Design Consisting of 3D Porous Separator Modulated with Patterned Anode for High‐Performance Dual‐Ion Batteries

Searching for low‐cost and high‐capacity electrode materials such as metal anodes is of important significance for the development of new generation rechargeable batteries. However, metal anodes always suffer from severe volume expansion/contraction during a repeated electrochemical alloying/dealloying process. In this study, a novel concept about modifying metal‐anodes‐based battery construction with a multifunctional electrode (ME) design is provided. The ME consists of a 3D porous separator that is modulated with a patterned aluminum anode, which simultaneously works as a current collector, anode material, and separator in a dual‐ion battery (DIB). The 3D porous separator not only enables the ME to possess significantly improved electrolyte uptake and retention capabilities, but also acts as a protecting layer to restrict the surface pulverization of the Al anode. The ME‐DIB displays remarkably enhanced cell performances, including excellent cycling stability with 92.4% capacity retention after 1000 cycles at a current density of 2 C, and superior rate performance with 80.7% capacity retention at 10 C.