symmetry point 中文意思是什麼
symmetry point
解釋
對稱點-
( 3 ). there exists a deficiency of the axial symmetry rotor plus two quasi - particles model for odd odd nuclei that the vibration far away from the inversion point is smaller
（ 3 ） .在研究奇奇核的二準粒子加軸對稱轉子模型中，存在著遠離旋稱反轉點兩端的劈裂幅度偏小的缺點。 -
Consisting of the protracting graph of hydrogen - like atom ' s angle distributing, computer simulation of the symmetry of molecular orbital and chemical reaction mechanism, showing the molecular point group and symmetry element, computer simulation of molecular vibration, bravias ' s crystal lattice and their transforming, extracting of plane periodic lattice, extracting of solid periodic lattice, close packing of isometrical pellet and the structure of simple mental substance, close packing of unequal pellet and crystal structure of representative ionic crystal, computer simulation of phase analysis by x - ray diffraction
內容包括類氫原子角度分布圖的繪制，分子軌道對稱性和反應機理的微機模擬，分子點群和對稱元素顯示，分子振動運動的微機模擬，布拉維晶格和晶格轉化，平面點陣抽取，立體點陣抽取，等徑網球的密堆積和金屬單質結構，不等徑圓球密堆積和典型離子晶體結構， x射線多晶衍射的微機模擬十個子模塊。 -
Symmetry and matrix representation of octagonal point groups in quasicrystal
準晶體中八方晶系點群的對稱性與矩陣表示 -
By adopting fta ( fault tree analysis ) and minimal path sets theory, the fault information stream analysis of spc - 33 digital governor is made, and from the point of system the ft is constructed. and the fault model with logic matrix in mirror symmetry has been built
本文運用fta故障樹分析方法和最小路集方法，對spc - 33電子調速器進行故障信息流分析，從系統化角度構築ft ，並建立鏡像對稱的故障邏輯矩陣模型。 -
Abstract : approximate methods for calculating aerodynamic heating rates on space shuttles are discussed. various methods are given for predicting the heating rate at axisymmetric stagnation points, general three dimensional stagnationpoints and the leading edge stagnation point of wings. numerous laminar and turbulent heating techniques for flat plates and cones are analyzed and compared. a brief review of some methods is presented to predict heating rate for winward centerline and lateral direction off the symmetry plane. the results show that the methods are simpler and can guarantee enought precision for predicting aerodynamic heating environment of space shuttles
文摘:介紹了國內外預測航天飛機氣動加熱的工程計算方法.給出了軸對稱、非軸對稱和機翼前緣等各種外形駐點熱流密度的計算，分析和比較了平板、錐體的層流和湍流熱流密度計算的各種方法，概述了航天飛機迎風面中心線和離開中心線橫向熱流密度的計算.計算結果表明，本文方法用在航天飛機氣動熱環境初步設計中比較簡單並且有足夠精度 -
For bilateral symmetry objects, the techniques on symmetry - point detection and symmetry - axis extraction are presented based on harmonic conjugation relationship. for rotated symmetry objects, the techniques on rotated units description and rotated symmetry center extraction are presented based on center invariants of objects. further more, by using 3d invariants and 2d projective transformation, an approach to recover shape from part symmetry objects is realized on some conditions
（ 3 ）深入分析了2d對稱性目標透視成像的幾何特點，將共點四線交比用於目標輪廓上的關鍵點的特性描述中；利用調和共軛關系，提出了一種針對左右對稱型目標的對稱點檢測和對稱軸提取的演算法；利用交比關系構造了目標的形心不變量，提出了一種針對旋轉對稱型目標的旋轉對稱單元判定、旋轉中心提取的演算法；進一步利用3d不變量和2d射影變換，實現了一定條件下的對稱性目標的形狀恢復技術。 -
It ' s a general method to construct the symmetry adapted bases of point groups. it has the advantage that the algebraic solutions of point groups can be obtained and the solutions are independent of representation space
它是尋找點群不可約表示的一般方法，不依賴于具體的表示空間，可以得到點群表示的代數解，特別適用於構造分子的對稱基。 -
On the assumption of ignoring the distortion of thickness, this paper determines the rough shape by the geometric modeling method of equal area developing using mixed mesh cell of triangle and quadrangle for the first time, presents the equal area developing arithmetic of quadrangle - triangle. on the virtual geometric symmetry axis, we puts forward the method of determining the developed coordinate of the point on the base band in the development of using regular quadrangle cell, determines the developed shape of internal structure in plane utilizing point - to - point mapping theory. furthermore, we realize the approximate developing of undeveloped - irregular boundary surface using a few triangle cells
本文結合型號研製中小曲率機翼整體壁板類零件坯料展開課題，基於板料厚向變形忽略不計的先驗假設，首創混合四邊形-三角形網格等面積展開的幾何模擬法確定壁板類零件毛坯外形，給出了混合四邊形-三角形網格等面積展開演算法；提出了虛擬分割線的概念，採用虛擬幾何對稱軸，給出了規整四邊形單元展開基帶上結點的計算方法；採用映射原理和求交演算法確定了壁板內部結構信息的展開定位。 -
With the method of the lie group transformation, the symmetry of the equation governing one dimensional finite strain consolidation is discussed and, from the point of the symmetry, the feasibility to obtain the analytical solution of these nonlinear partial differential equations is discussed. where - after exact or approximate analytical solutions focused on different consolidation problems are obtained, these including : under some assumptions of relations of the void ratio with coefficient of permeability and effective stress, the method of lie group transformation is applied to solve the non - linear partial differential equation of large strain consolidation of homogenous saturated clay soil in semi - infinite domain with the consideration of the material and geometrical nonlinearity during consolidation procession. the implicit exact solution without considering the effect of self - weight of soil is obtained
運用lie群變換方法討論了一維大應變非線性固結方程的對稱性，以及在該對稱性的意義下求解這類非線性偏微分方程解析解答的可能性，並就大應變非線性固結問題的多種情況求得了其完整的或者近似的解析解答，具體包括：基於有效應力與孔隙比以及滲透系數與孔隙比之間的關系的一些假定，採用李群變換求解考慮材料非線性和幾何非線性的半無限均質土體大變形固結非線性偏微分方程，得到了一個不考慮自重固結的完全解析解。 -
By means of discussing plane symmetry that relates to point, curved surface and curve in a three - dimensional space, this paper gives a method to study point 、 curved surface 、 plane symmetric point on a curve 、 symmetric curved surface and symmetric curve equation
摘要討論了三維空間中，點、曲面、曲線關于平面的對稱問題，從而給出了求點、曲面、曲線關于平面對稱的對稱點、對稱曲面、對稱曲線方程的方法。 -
The use of wave packet to analyze the dynamics of quantum mechanical systems is an increasingly important method to the study of the classical - quantum correspondence. using the quantum gaussian wave packet analysis method, we calculate the autocorrelation function of the rectangular billiard, the peak positions of the autocorrelation function match well with the periods of the classical periodic orbits, which show that the period of the classical orbits can be produced by the time - dependent quantum wave packet method. we also discuss wave packet revivals and fractional revivals in the rectangular billiard, the results show that there are exact revival for all wave packet at each revival time. we find additional cases of exact revivals with short revival times for zero - momentum wave packets initially located at special symmetry point inside the billiard
利用波包分析量子力學體系的動力學行為在研究經典和量子的對應關系方面越來越成為一個非常重要的方法.利用高斯波包分析方法，我們計算了矩形彈子球體系的自關聯函數，自關聯函數的峰和經典周期軌道的周期符合的很好，這表明經典周期軌道的周期可以通過含時的量子波包方法產生.我們還討論了矩形彈子球的波包回歸和波包的部分回歸，計算結果表明在每一個回歸時間，波包出現精確的回歸.對于動量為零的波包，初始位置在彈子球內部的特殊對稱點處，出現一些時間比較短的附加的回歸 -
The study of simple high order symmetry - breaking bifurcation point
簡單高階對稱破壞分歧點的研究 -
In this paper, the artificial neural networks are considered as a structure set of the neurons. based on this point of view, we make a comprehensive and deep researching on the hopfield model neural network of associative memory with hebbian learning in three aspects, i. e., analyzing, describing and computing of the symmetry of the system, thus discovering the storing mechanism of the hebbian learning rule. which give a deeper understanding to the associative memory mechanism of artificial neural network
本文將人工神經網路視為神經元的結構集，並從這個基本觀點出發，從三個方面，即對稱性的分析、表示以及計算，對hebb型的離散hopfield模型神經網路進行全面的、深入的研究，揭示了hebb法則這種特殊的存儲規則的機理，並以此來達到加深對整個網路的聯想記憶機理認識的目的。 -
After mechanical and process properties testing, the results indicated that : ( 1 ) the film resin can make the properties good in climbing drum peer strength of sandwich constructions composite, the little effects of the film resin on other mechanical properties have been given ; ( 2 ) the sandwich composite has the better mechanical properties at central symmetry layer than asymmetric layer ; ( 3 ) through the study of the different pressure of the sandwich composite, the result is obtained that the edgewise properties increases, the flexural properties decreases with the pressure increase from 0. 2mpa to 0. 5mpa ; ( 4 ) at the sameness extend layer, the mechanical properties of the laminate is bigger than that of the honeycomb sandwich panel ; ( 5 ) through the studies on honeycomb sandwich plate delamination under three - point bending tests. it is found that the flexural strength decreases with the area of delamination increases
研究表明： （ 1 ）膠膜能明顯的提高蜂窩夾層結構的剝離性能，對其它性能的影響不大； （ 2 ）對稱鋪層較非對稱鋪層的力學性能高； （ 3 ）固化壓力由0 . 3mpa提高至0 . 5mpa時，蜂窩夾層結構的側壓強度提高，而彎曲強度和剪切剛度分別降低； （ 4 ）蜂窩夾層結構中的面板較同樣材料鋪層的復合材料疊層板的力學性能低； （ 5 ）蜂窩夾層結構的界面上有缺陷時，彎曲強度下降，且隨著缺陷面積增大，彎曲強度下降幅度增大。 -
Second, we try to find another kind of realization of yangian so that we can study the symmetry of this system based on a different point of view. we find that there is yangian symmetry in dirac oscillator, as a result, we are able to shift one degenerate state to anther in the same energy level. then we construct the corresponding transfer matrix to determine the rtt integrability of dirac oscillator
然後，本文尋找dirac諧振子的另外一種yangian實現形式，從另一個角度研究該體系的對稱性，從而表明dirac諧振子這里這種實現下具有yangian對稱性，這樣，我們可以實現在同一個能級的不同簡並態之間的躍遷，再構造出相應的整體轉移矩陣，確定dirac諧振子在rtt意義下的量子可積性的問題。 -
So it is very suitable to construct the symmetry bases of point groups of molecules. in this paper we studied the spectra of g6h6 and c6d6 and the intensities of infrared and raman transitions, by combining the algebraic model with the sbr technique. a great agreement between observations and calculations was obtained
本文就是將iachello ? oss （ 10 ）的分子代數模型與陳金全等人的sbr方法結合起來，用以研究c _ 6h _ 6及c _ 6d _ 6分子的能譜、紅外躍遷強度以及raman躍遷強度，並得到了很好的結果。
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