由邻苯二甲酸和Medpq配体构筑的锌的配合物的水热合成及晶体测定

A metal-organic coordination polymer [Zn(Pht)(Medpq)]_n (Pht=phthalic acid, Medpq=2-methyldipyrido[3,2-f:2′,3′-h]quinoxaline) (1) has been hydrothermally synthesized and structurally characterized by elemental analysis, IR spectrum, TG and X-ray single-crystal structure analysis. Title complex crystallizes in the monoclinic system, space group Cc, with a=1.027 4(4) nm, b=2.955 7(11) nm, c=0.685 2(3) nm, β=112.941°, V=1.916 3(13) nm³, C₂₃H₁₄N₄O₄Zn, M_r=475.75, D_c=1.649 g·cm^-3, μ(Mo Kα)=1.324 mm^-1, F(000)=968, Z=4, the final R=0.038 8 and wR=0.071 7 for 2 697 observed reflections (I>2σ(I)). In the crystal structure, the Zinc atom is six-coordinated with four carboxylate oxygen atoms from two different carboxylate groups and two nitrogen atoms from Medpq ligand, showing a slightly distorted octahedral geometry. Furthermore, it exhibits a one-dimensional structure with Pht-Zn-Medpq as building units. CCDC: 716600.     

Time-dependent crosstalk effects for image sensors with different isolation structures

Photo-generated carriers may diffuse into the adjacent cells to form the electrical crosstalk, which is especially noticeable after the pixel cell size has been scaled down. The electrical crosstalk strongly depends on the structure and electrical properties of the photosensitive areas. In this work, time-dependent crosstalk effects considering different isolation structures are investigated. According to the different depths of photo-diode(PD) and isolation structure, the transport of photo-generated carriers is analyzed with different regions in the pixel cell. The evaluation of crosstalk is influenced by exposure time. Crosstalk can be suppressed by reducing the exposure time. However, the sensitivity and dynamic range of the image sensor need to be considered as well.     

相干信号频率和到达角联合估计的算法

基于均匀圆阵和四阶累积量,提出了一种相干信号频率和到达角联合估计的新算法。首先,利用计算量较小的PRO-ESPRIT算法和beamspace-ESPRIT算法分别估计广义阵列响应矢量和信号的频率。然后,对广义阵列响应矢量进行模式空间变换,并利用改进的前后向线性预测方法估计出相干信号的到达角。该算法能在色噪声环境下,精确地估计出空间相干信号的频率和到达角,并且无需平滑技术和谱峰搜索,具有计算量小,参数自动配对的特点。计算机仿真结果验证了算法的有效性。     

CMOS电路参数的统计优化设计

本文提出了一种用实验设计与模拟相结合对ＣＭＯＳ集成电路参数进行统计优化设计的方法,分析工艺因素设置及其起伏对电路参数的影响,建立起电路参数相对主要工艺因素变化的宏模型,并且模型公式找出使电路参数在预期值附近且偏差最小的优化工艺条件。     

纳米级MOSFET的模拟

利用从量子波尔兹曼方程简化得到的双量子修正和计入载流子动量的全流体动力学模型,编制了流体动力学半导体器件模拟程序,并对栅长25nm的体硅MOSFET和栅长30nm的FinFET结构进行了模拟.模拟结果表明,改进后的流体动力学模型在工程应用中能够适应模拟纳米级MOSFET的要求,用于纳米级MOSFET的特性研究和优化设计.     

一种基于汉字笔顺特征的关键词变体匹配方法

近年来,垃圾短消息呈现出包含大量拆分字、形近字现象,这种短消息可以绕过监控系统的关键词审查。由于拆分字、形近字数量众多、变化灵活,将其加入关键词库将使得关键词库冗余。对此,本文提出了一种基于汉字笔顺特征的关键词变体匹配方法,基于汉字笔顺特征,首先合并垃圾短消息中的拆分字,然后通过建立索引查找短消息中包含的疑似关键词,最后提出了“金字塔匹配法”匹配关键词。本文提出的方法有效降低了关键词库的冗余度,提高了关键词匹配效率。     

全空间上一类奇异p-Laplace方程无穷多解的存在性北大核心CSCD

本文研究了全空间上一类带奇异系数及其扰动的椭圆型p-Laplace问题-△_pu-μ(|u|^(p-2)u)/(|x|~p)=λ(u^(p*(t)-2))/(|x|~t)u+βf(x,u),x∈R^N,u∈D_0^(1,p)(R^N),其中N≥3,D_0^(1,p)(R^N)是C_0~∞(R^N)的闭包,△_pu=-div(|▽u|^(p-2)▽u),2     

利用交叉克尔非线性产生四光子偏振态簇态

提出了一种基于交叉克尔非线性效应产生四光子偏振态簇态的方案,与其他产生四光子簇态的方案比较,该方案引入宇称门的思想和用到基于零差探测的非破坏测量方法,使得该方案在实验上更易于操作及实现.     

沟道应力对纳米尺度MOSFET器件特性的影响

利用ISE DESSIS器件模拟工具,模拟了纳米尺度的MOSFETs器件沟道中存在应力时的器件特性,分析了应力大小和方向发生变化对MOSFET的阈值电压、亚阈特性等器件特性的影响.     

用于LDA的无监督特征选择(英文)

As a generative model,Latent Dirichlet Allocation Model,which lacks optimization of topics' discrimination capability focuses on how to generate data,This paper aims to improve the discrimination capability through unsupervised feature selection.Theoretical analysis shows that the discrimination capability of a topic is limited by the discrimination capability of its representative words.The discrimination capability of a word is approximated by the Information Gain of the word for topics,which is used to d...