查询词典 rational fractional function

The fractional anisotropy values of white matter in schizophrenia patients and normal controls were measured respectively in frontal and the splenium of corpus callosum. Independent-samples t-test for non-paired data was used to test the differences between schizophrenia arid controls for FA values. Correlated analysis was applied to reveal the correlations between FA values in frontal and the PANSS scores.

对22例精神分裂症患者和20例健康志愿者进行脑部DTI扫描后，测量双侧额叶和胼胝体压部的各向异性分数值，应用成组t检验对精神分裂症患者和正常健康对照组的相应区城进行比较，并用部分相关性检验对精神分裂症患者脑中各部位相应FA值与PANSS量表评分之间的关系进行统计。

Objective: To assess the response of fractional stereotactic radiotherapy for lung cancer.

目的：探讨立体定向放射治疗肺癌的近期疗效。

A desulfurization method is proposed for the removal of sulfur compounds from FCC gasoline by alkylation reaction of thiophenic sulfur with olefins over acid catalysts, and the higher boiling sulfur-containing products are removed by fractional distillation.

选择以噻吩的甲基取代衍生物(包括 2-甲基噻吩、3-甲基噻吩及 2，5-二甲基噻吩)与异丁烯的烷基化反应为模型反应，考察了经三氯化铝气相固载法改性的 CT175 树脂催化剂催化噻吩的甲基取代衍生物与烯烃的烷基化反应性能。

Secondly, the fractional order differentiation of rectangle signal, triangle signal and trapezia signal are carried out, meanwhile the analytical expressions of them are presented in this paper.

给出了一些常用周期信号分数阶微分的解析形式，同时也研究了周期序列的分数阶微分运算的数字实现。

In earlier studies, major classes of triacylglycerols were separated on the basis of unsaturation (i, e., trisaturated, disaturated, diunsaturated, and triunsaturated ) via fractional crystallization and oxidation-isolation methods.

早期的研究，在研究不饱和现象的基础上，通过分级结晶和氧化-分离方法，将三酰基甘油分为几类(如三饱和酸、二饱和酸、二不饱和酸和三不饱和酸)。

Many new detection techniques are proposed, that include: To overcome the faults of cross-terms and short unambiguity range for the common Wigner-Ville Distribution , short-time Fourier transform and Gabor transform are applied to SAR moving target detection. To improve the detection performance of WVD in noise environment, a new technique based on the Cross-WVD is proposed. The application of fractional Fourier transform to chirp signal detection is analyzed and extended to SAR moving target detection. To eliminate the restriction of chirp-Fourier transform, a new modified definition is proposed and applied to SAR moving target detection. To detect multiple moving targets whose scattering intensities are different heavily, the CLEAN technique is combined with the above techniques and the ideal detection performance is achieved. At last, the whole dissertation is concluded.

具体的研究成果如下：针对常用的Wigner-Ville分布在多目标情况下存在交叉项，并且多普勒不模糊范围小的缺点，提出将短时Fourier变换和Gabor变换应用于SAR运动目标检测，分析了其优势所在；为进一步提高Wigner-Ville分布低信噪比条件下的信号检测能力，提出基于互Wigner-Ville分布的运动目标检测方法；分析了分数阶Fourier变换在线性调频信号检测中的应用，提出基于分数阶Fourier变换的运动目标检测算法；对离散Chirp-Fourier变换的定义进行了修正，提出修正的离散Chirp-Fourier变换，克服了限制其应用的约束条件，并用于SAR运动目标检测当中；强度相差较大的多运动目标检测历来是机载SAR技术的一个重点和难点，我们将CLEAN思想融入上述多种算法当中，良好地解决了该问题。

In chapter two and three, for the low-frequency electromagnetic problems in multi-media, an alternate A-φ method (in Chapter 2) and a fractional-step A-φ method (in Chapter 3) based on ungauged vector potentials are developed respectively.

第二、三两章关于多媒质中的低频电磁问题发展了基于非规范势的交替A-φ方法和分数步A-φ方法，并在一定条件下对这两类方法的全离散有限元逼近误差进行了理论上的分析和估计； 3。

Unoxidated and oxidized wheat stalks were extracted sequentially with CS2, benzene, methanol, acetone and THF, and the extraction solutions were analyzed with GC/MS. The relative contents and compositions of fractional extracts of un-oxidized and oxidized wheat stalks were compared.

采用二硫化碳、苯、甲醇、丙酮和四氢呋喃对未氧化和氧化的麦秆进行分级萃取，比较麦秆各级萃取物的相对含量和组成差异，并对各级萃取物的组成进行GC/MS分析。

The fundamental concepts of micropolar fluid , couple stress fluid, fractional Maxwell fluid and smart fluid are described.

简要介绍微极性流体，应力偶流体，非整数阶Maxwell流体和智能流体的基本概念，通过简单的例子阐述它们与牛顿流体的本质差别，并介绍非牛顿流体在以上热点研究领域的若干进展。

Using the fractional ultrasonic-extraction on four different-rank coals, including lignite, coking coal, low- and mid-metamorphism anthracites by different solvent, isotherm adsorption experiment was made after equilibrium-water accessioned into raw coals and their residues. The change of the adsorption capacity and its affecting factors were analyzed combined with the pore-structure and equilibrium-water content measurement.

采用不同溶剂对褐煤、焦煤、低级无烟煤R(下标 o，max 2.62%以及中级无烟煤R(下标 o，max 3.74%等四个煤级煤样进行分级超声萃取，然后对原煤和萃余物进行平衡水预湿的方法，进行了等温吸附实验，并结合孔隙结构测试和水分含量变化，分析了溶剂萃取后萃余物的吸附性能变化及其影响因素。

The studies on the developing of new media are very important to the increasing of the area density of HDD and to the implementation of hybrid recoding technology.

光磁混合记录方法，是一种可以突破超顺磁极限的限制，并进一步提高硬盘记录密度和读写速率的一种新型超高密度信息存储方式。

In io, mTOR inhibition promotes T cell anergy under conditions that would normally induce priming.

体内研究中，在正常可激发免疫反应的条件下，抑制mTOR可促使T细胞无能。