模特征

In this dissertation,the biostatistics and biomathematics methods are used to analyze the characteristics of motif in protein superfamily.The paper mainly includes the analysis of motif characteristics,conservative motif distribution,features extraction and the identification of the protein superfamily.

本文以蛋白质超家族中的模体和序列为研究对象，用生物统计学和生物数学中的方法，从蛋白质超家族中的模体功能特征分析及相对位置分布统计、信息特征提取和蛋白质超家族识别这三个方面进行了研究。

For different polynomials g, if the characteristic polynomial of a n matrix A is irreducible, then we get some theorems to determine matrix equations g =A solvable; if it is reducible, then, to see n-dimension space vectors M over a field F as F-module, we use module theory to determine these equations solvable such that it is simpler and clearer to investigate these questions.

对于不同多项式g，当n阶矩阵A的特征多项式为不可约的，我们给出了矩阵方程g=A有解的判定定理；当A的特征多项式为可约的，把域F上的n维线性空间M作为由A导出的F -模，我们利用模论知识来决定矩阵方程g=A有解性，从而使这一问题变了简单，研究思路更加清晰。

It is also the base of structure optimization.According to main object characteristics of structural dynamics design,structuraleigenveetor sensitivity computation is,first,be studied.A Neumann series expansionmethod is proposed in accordance with the modal method and is developed to agreewith the structure with rigid body modes.A rapid Neumann series expansion methodfor eigenvector sensitivity is formed;it may greatly improve the efficiency ofcomputing eigenvector derivation.

本文根据结构动力学设计的主要目标特性，首先进行了结构特征向量灵敏度分析研究：形成了计算特征向量灵敏度的Neumann级数展开法，并将其扩展到适用于具有刚体模态的结构特征向量灵敏度分析；研究出计算特征向量灵敏度的快速Neumann级数展开法，该方法大大提高了特征向量灵敏度分析的效率；建立了无需K-1运算的结构特征向量灵敏度分析的共轭梯度迭代法。

Based on this, this paper develops the modal series method, expounds its mathematic foundation and theory system, and compares it with the linear modal analysis and the method of norm form of vector fields.

开发了基于模态级数法的HVDC/AC互联电力系统分析软件包，通过此软件可以得到系统的非线性响应，获得非线性系统零输入响应的近似闭式解，进行系统模态分析、非线性模态交互作用分析，并为控制系统设计提供有价值的特征信息。

When the westerly wind stress anomaly is prescribed maintaining for a decade, the cooling of the KOE region induced by the subpolar gyre anomaly is subsequently able to influence the central North Pacific, accordingly maintaining the initial negative SST anomaly over there.

结果表明，赤道太平洋的海温存在10～20年的年代际变化模态，在年代际模态较显著的时期，ENSO的振幅较强，周期也要短。1980年前后El Ni〓o建立阶段SST演变特征的差异与赤道太平洋风场异常特征的改变有关。

This paper analyzes the principle of the LP-LFC process,presents the physical and mathematical models of mould filling of the new process. The patterns including window-plate, ladders cluster, electromotor frame and exhausting manifolds are poured using LP-LFC process with AZ91D alloy, and the mould filling course is tracked with electrode touch point method. Based on above tests and experiments,the casting defects including short runs, cold laps, trapped gas,metal penetration, and so on, were investigated. The appearance characteristics,birth causes and influence factors of above defects are discussed in the article,diagrammatize modes of the defects forming is also given, and the measures of reducing or avoiding defects are put forward.

本论文分析了低压消失模铸造技术的工艺原理，建立了低压消失模铸造过程中金属液充型的物理和数学模型；在各种工艺条件下浇注了薄板窗体、阶梯模样簇、电机外壳和发动机排气管四个典型的模样和产品，用电极触点法记录了镁合金低压消失模铸造的充型过程；试验研究了镁合金低压消失模铸造中出现的浇不足、冷隔、气孔、粘砂等典型缺陷，分析了这些缺陷的形貌特征、形成原因及影响因素，给出了缺陷形成过程的图解模型，提出了减少和消除缺陷的工艺措施。

Using ethyne as source gas, CNTs were successfully synthesized by CVD method. By comparing different synthesis technics, the influences of parameter to the grow of CNTs, such as catalysts, growth time, reaction temperature and ratio of all kinds of carrier gases were investigated. The results showed that the influence of carrier gas, reaction temperature, and the growth time on synthesis of CNTs was significant. In conclusion, a better condition for carbon nanotube growth was obtained. Through analyzing Raman Spectrum of samples, GM and SWNTs' characteristic peak-RBM was indicated.

采用乙炔为碳源、氢气和氩气为载气，利用气相催化热解法在AAO模板上成功的制备出了纳米碳管，用TEM，SEM，EDS，Raman等表征方法研究了生长温度、裂解时间、载气含量和不同催化剂对碳纳米管的石墨化程度、产物形态的影响，指出了单壁碳纳米管的特征振动模式—径向呼吸振动模以及拉伸振动模式G模，缺陷导致的D模，并采用蒸金后的样品进行了场发射的测试，得到了F-N曲线，与理论符合较好。

AO mode haves the obvious seasonal variability. From winter to summer, the height of AO modes conversion becomes low, and the pleion in the boreal Pacific moves from the ocean to the East Asian land.

AO模态有明显的季节变化特征，从冬季到夏季，AO模态的转变层高度由高变低，北太平洋地区的正距平中心从海洋移到东亚大陆，从夏季到冬季，AO模态的转变层高度由低变高，东亚大陆上的正距平中心又移回到海洋上空。

On basis of the analysis for cores and well-logging, the authors have thoroughly studied the sedimentary facies types and characters of Chang 6 oil-bearing formation of the Baibao region with casting thin sections, SEM, trace elements and porosity and permeability analysis and a great deal of indoor testing data. The authors propose that the sedimentary facies type of Chang 6 oil-bearing formation of the Baibao region is a sublacustrine slump turbidite fan for the first time, and lithology is lower componential and textural maturities micro-fine feldspar sandstone primarily, with graded bedding, fluidified convolute bedding, slipping-cut and deformational structures, minitype syngenetic faults, flute cast, groove cast, load cast and other turbidite sedimentary facies signatures.

作者在岩心描述和测井分析基础上，结合铸体薄片、扫描电镜、重矿物、微量元素和孔渗分析等大量测试资料，对该地区长6油层组沉积相类型及特征进行深入研究，首次提出白豹地区长6油层组属于湖底滑塌浊积扇沉积体系，岩性以成分和结构成熟度均偏低的微－细粒长石砂岩为主，具粒序层理、液化包卷层理、滑动截切和变形构造、小型同生断层、槽模、沟模和重荷模等浊积沉积相标志。

Due to different properties of the signal and noise in wave-let coefficient modulus under different scale of wavelet transformation, we can extract the edge characteristic through detecting the local maximum of the wavelet transformation coefficient modulus.

基于信号与噪声在不同尺度下小波系数模的变化特征，可以通过检测小波变换系数模局部极大值来提取图像的边缘特征。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。