Expanded mixed element method of elliptic problem under triangular grids 橢圓問題在三角網(wǎng)格剖分下的擴展混合體積元方法
The first day cover combines the same graphics into a triangular grid symbolic of both the geographical shape of the prd and the tripartite partnership of guangdong , macao and hong kong 首日封的設(shè)計則把裁剪成小三角形的郵票構(gòu)圖,組合成一個大三角形,儼如珠江三角洲的地理形狀,亦是粵港澳三地合作無間的象徵。
The conception of the object - space separating modeling technique based on the triangular grids is introduced , and simplification calculation of the points of intersection between semi - finished material and cutting scanning body brings forward , which reduces calculation quantities in simulation , increases the speed of simulation and optimizes the effect of simulation 重點介紹了基于三角網(wǎng)格的物體空間離散建模概念,提出了刀具和毛坯求交計算的優(yōu)化方法。建模方法和求交算法的優(yōu)化減小了仿真過程中的計算量,提高了仿真的速度,優(yōu)化了仿真的效果。
Finally , a novel adaptive interpolation magnification algorithm is proposed for color image to obtain a higher resolution image from its low resolution version . it adopts the basic idea of the adaptive interpolation schemes : local analysis to classify pixels into different categories and choose different interpolation algorithms by means of rational - linear vector valued interpolation over rectangular or triangular grids 在基于圖像局部特征分析的基礎(chǔ)上,將圖像劃分為不同的區(qū)域,對不同的區(qū)域相應(yīng)地采取不同的矩形網(wǎng)格或三角網(wǎng)格上的二元(向量值)混合有理插值方法,實現(xiàn)圖像的無級縮放。
In this thesis , some algorithms on unstructured triangular grids are presented for solving the euler equations , especially for solving the hypersonic problems . on the base of unstructured grid generating program , the self - adaptive mesh technique is employed to improve the efficiency and accuracy of the calculation , and can preserve the mesh " s quality 在課題組非結(jié)構(gòu)網(wǎng)格生成程序的基礎(chǔ)上,本文發(fā)展了一套自動化程度很高的自適應(yīng)網(wǎng)格程序,該軟件能夠有效的提高流場計算的分辨率和計算效率,同時能夠保證網(wǎng)格的質(zhì)量。