查询词典 symmetry

This article according to the function image axial symmetry and the point symmetry basic principle,the use function taylor series expansion,determines and seeks the polynomial function image the axis of symmetry or the center of symmetry.

根据函数图象轴对称及点对称的基本原理，利用函数的泰勒级数展开式，来判定和寻找函数图象的对称轴或对称中心。

We present the fundamental theories of Noether symmetries and conserved quantities of mechanco-electrical dynamical systems, including variation principle of the system, Noether symmetry transformation, Noether quasi-symmetry transformation, generalized Noether quasi-symmetry transformation, Killing equations, Noether theorem, the form of conserved quantity. And then the basic theory of Lie symmetry is advanced, including the determining equation, structure equation and the form of conserved quantity.

给出机电动力系统的Noether对称性和守恒量基本理论，包括系统的变分原理、Noether对称性变换、Noether准对称性变换、广义Noether准对称性变换、Killing方程、Noether定理和守恒量的形式；给出机电动力系统Lie对称性的基本理论，包括确定方程、结构方程以及守恒量的形式。

Secondly, three kinds of mathematics model of optical vortex beams were introduced here. Then the propagation dynamics of optical vortex beams through the non-axis symmetry system is studied, this chapter includes the introduction of the symmetry vortex beam and the non- symmetry vortex beam, the deduction of the Collins diffract integral formula for the non-axis symmetry system, and the transformation of the vortex beam passing through the non-axis symmetry system has been described by using the numerical simulation. Then the general calculation for the orbit momentum of vortex beams, the matrix form for the orbit momentum of vortex beams, and the photon method to describe the orbit momentum of vortex beams are also introduced here. Finally, the interference about optical vortex beams was studied.

本文对涡旋光束进行了较为全面的介绍和研究，主要内容包括：（1）光学涡旋光束的基本理论，主要是介绍了单个光学涡旋光束在柱坐标中的一些表征，涡旋光束的奇异相位和光学涡旋的相位结构；（2）光学涡旋光束的三种数学模型；（3）光学涡旋光束在非轴对称光学系统中的传播动力学，其中介绍了对称涡旋光束与非对称涡旋光束，推导了非轴对称光学系统的 Collins 衍射积分公式，并利用计算机模拟图描述了对称涡旋光束经过非轴对称光学系统后涡旋形态的改变；（4）涡旋光束轨道角动量的一般计算，涡旋光束轨道角动量的矩阵形式，光子法描述涡旋的轨道角动量；（5）涡旋光束的干涉。

A determination method of ursolic acid in Callicarpa macrophylla Vahl leaves by reversed- phase high performance liquid chromtograph was established. The chromatographic column (Symmetry Shield RP18), methanol-water mobile phase(88:12, V/V) with 1.0 ml/min flow rate, the detection wavelength (210nm) and the column temperature (25℃) were adopted.

建立反相高效液相色谱测定其含量的方法，色谱柱为Symmetry Shield RP18柱，流动相为甲醇-水（体积比88∶12），流速1.0 ml/min，检测波长210 nm，柱温25℃。

A determination method of ursolic acid in Callicarpa macrophylla Vahl leaves by reversed- phase high performance liquid chromtograph was established. The chromatographic column (Symmetry Shield RP18), methanol-water mobile phase(88:12, V/V) with 1.0 ml/min flow rate, the detection wavelength (210nm) and the column temperature (25℃) were adopted.

建立反相高效液相色谱测定其含量的方法，色谱柱 Symmetry Shield RP18柱，流动相为甲醇-水（体积比88∶12），流速1.0 ml/min，检测波长210 nm，柱温25℃。

Methods The determination was carried out over a Symmetry C18 column at 25℃. Methods tetrahydrofuran: 0.2% citric acid (14∶1∶85) was used as mobile phase at a velocity of 1 ml.min-1 and the detection wavelength was set at 360nm. ResultsRutin was found in SFE extract of Sparganium Stoloniferum.

方法在聚酰胺膜上点样，以80%乙醇作为展开剂鉴别芦丁，采用Symmetry C18色谱柱，以乙腈-四氢呋喃-0.2%枸橼酸（14∶1∶85）为流动相，柱温25℃，在流速为1.0 ml.min-1，360 nm的检测波长下，测定芦丁含量。

With the application of the symmetry of line and circularity,the speed of the generation of a whole compass screen is highly advanced.

利用直线对称性和圆的对称性，提高了全罗盘画面的生成速度。标签走样 Bresenham算法对称性 aliasing arithmetic of bresenham symmetry

Symmetry and balance both imply an arrangement of parts and details on either side of a dividing line, but symmetry frequently emphasizes exact or mirror-image correspondence of parts, while balance often suggests dissimilar parts that offset each other to make a harmonious and satisfying whole

Symmetry 和 balance 都暗示在分界线两侧的局部或细节的安排，但 symmetry 常强调各部分精确或左右相反镜像的一致，而 balance 经常暗指通过相互抵消以形成和谐、令人满意的整体的不相似部分

In this paper, we sort out the traditional theory of the symmetry of the system, from the perspective of scientific thinking to explore the origin of the universe and the evolution of mechanisms of material logic, focusing on symmetry and Non-symmetry, and analyze the theoretical thinking and dialectical thinking of the broken symmetry, and we explore the value of epistemology and significance of methodology from symmetry to the broken symmetry.

本文对传统的对称性理论进行了系统梳理，从科学思维方法的角度探讨宇宙起源和物质演化机制的认识逻辑，围绕对称性和非对称性、以及对称性破缺的理论思维和辩证思维的特点进行了分析，并探讨了从对称性到对称性破缺认识过程中的认识论价值和方法论意义。

OWL adds more vocabulary for describing properties and classes: among others, relations between classes (e.g. disjointness), cardinality (e.g."exactly one"), equality, richer typing of properties, characteristics of properties (e.g. symmetry), and enumerated classes.

添加了更多的用于描述属性和类型的词汇，例如类型之间的不相交性，基数，等价性，属性的更丰富的类型，属性特征（例如对称性，symmetry），以及枚举类型。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。