查询词典 fractional function

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 application of sulfur isotope tracing involves the physical and chemical conditions, origin of ore-forming minerals, denudating degree of orebody, ore enriching position and genesis types of deposits. In the application, the geology of the hydrothermal deposit should be well understand to distinguish metallogenic epochs and judge the isotopic fractional equilibrium state, combined with the Ohmoto mode to study the factors possibly affecting hydrothermal fluid system.

在总结前人研究基础上，综述了硫同位素在热液成矿作用中成矿物理化学条件、成矿物质来源、矿体剥蚀程度、矿化富集部位、矿床成因类型等的示踪意义，认为硫同位素示踪应用须在了解热液矿床基础地质前提下，准确区分成矿期次，判别硫同位素分馏平衡状态，结合Ohmoto模式综合研究影响成矿热液体系的各种因素才可以赋予同位素准确的地质内涵。

This suggested that the purified and dialyzed SjR47 fractional protein should have better immunogenicity and immunoreactivity, and share egg origin antigen.

实验结果表明，经纯化透析后的SjR47组分蛋白具有较高的免疫原性和免疫反应性，该蛋白分子属血吸虫卵源性组分抗原。

The method for parameters estimation based on fractional differenced whitening filter is proposed, the essentiality of which is to find out a factor by calculating the extremum of the statistic test expression for the output.

最后提出基于该滤波器的参数估计方法，其实质是通过计算输出信号的统计测试表达式的极值获得分形参数。

Both of them use the technique of fractional differencing to remove the long-range dependence in the time series.

首先它们都通过分数差分的方法消除时间序列中的长相关性，然后分别用模糊自回归模型进行建模或预测。

We have something to do in the new stage.

在这段崭新的时期中，我们有一些要做的。

The difference between tourism decision-making under uncertainty and risky tourism decision-making is indistinctive.

其中不确定性旅游决策和风险旅游决策的界线比较模糊，两者的区分是相对的。