Based on grasping the connotation of sustainable development , the author constructs the two dimensions model to evaluate the conditions of region sustainable development with fractal theory according to its structure of two dimensions of development level and sustainability . the model corresponds the statistical indexes of region sustainable development systeiri to dots on the coordinate of multi - dimension space and takes the fractal dimensions as the parameters of conditions of region sustainable development according to the spatial distribution characteristics of the dots . the author takes nine provinces ( or regions ) of yellow river drainage area as objects to perform applied study and shows the result by gis and vector , this indicates that the model is feasible 基于此,在把握可持续发展内涵的基础上,从发展水平和可持续性的二维结构出发,利用分形理论构建了区域可持续发展评价的二维模型,把区域可持续发展系统的统计指标和多维空间中的坐标上的点对应起来,考察其空间分布的特点,利用分形维数来表示区域可持续发展的状况,并以黄河流域九省区为例进行了应用评价研究,并用gis技术和向量直观的表现了出来结果表明了它的可行性。
Abstract : concerning the models for discribing aerodynamic stability of axial flow compressor , the original model is one - dimensional , and it is reasonable for the onset of surge only . for the onset of rotating stall , there are just some two - dimensional models at published literatures . a three - dimensional aerodynamic of compressor has been presented in this paper . an aerodynamic stability model concerning radial disturbance of compressor is presented . the calculated results show that the occurrence of radial disturbance is related to the axial velocity disturbance , which has important effect on aerodynamic stability of compressor . the position of onset of stall , in blade tip or hub , is dependent upon the characteristics of blade element . the comparisons of calculated results predicted by 2d and 3d aerodynamic stability model have also been made in this paper 文摘:轴流压气机的气动稳定性模型,最初为一维模型,仅适用于描述喘振发作.对于旋转失速发作,在公开文献中有一些二维模型发表.本文提出了一类考虑压气机径向扰动对失速影响的新的气动稳定性模型.计算结果表明压气机的轴向扰动往往随着径向扰动的产生,径向扰动的强度影响压气机的气动稳定性,在叶尖还是叶根首先产生失速与压气机基元叶栅特性密切相关.本文对轴流压气机二维和三维气动稳定性模型的计算结果进行了对比分析
The paper is based on the project of " the research of mathematics and computer frequency dynamic simulation theory on knobs not result " . the research content is object to the image of log knobs by vidicon getting to detect the shape of log knobs according to the method of video disposal . the paper apply digital image processing technology to log knobs image to swell and detect borders , then distill the surface shape and characteristic parameter of knobs . the thesis depict the knobs three - dimensional models , build the mathematics models of log knobs and simulation two - dimensional image curve of the log knobs primary section which has been discerned , thereby achieve our researching aim to reappear the knobs image on computer 本论文是国家自然科学基金资助项目“节子ndt结果的数学描述与视频动态模拟理论的研究”的基础研究之一,论文的研究内容是通过视频处理的方法检测原木表面节子的形状,以摄像机采集的原木表面节子图像为对象,运用数字图像处理技术对节子图像进行修正、增强、边缘检测等处理,提取节子的形状特征参数,并运用数学的方法,归纳总结其规律,应用数学的方法对节子的二维模型进行描述,建立原木节子的数学模型,对识别出的原木节子主截面的三维图像曲线进行拟合处理,从而在计算机上实现节子的分布与形态的再现,达到研究节子的空间形态和分布规律的目的。
This thesis probes beneficially into numerical calculating and analyzing of the two - dimension model of organic static induction transistor by adopting finite element method , and builds theory foundation for further analyzing systematically operational mechanism of organic static induction transistor and optimizing design of structure parameters for the future 本论文应用有限元法对有机静电感应三极管二维模型的数值计算及解析进行了有益的探索,为今后进一步系统性解析有机静电感应三极管的工作机理和进行结构参数的优化设计构筑了理论基础。
In this paper , recognition aircraft is based on model - - it is realized through matching the single image with 2d model . a new algorithm about adaptive data sampling based on vertical distance has been proposed , furthermore , a modeling method applying this algorithm for complex surface objects has been addressed in this paper 本文对飞机识别的研究应用了基于模型的视觉方法? ?将cad模型转换为适合视觉应用的二维模型,通过目标的单幅灰度图像与二维模型的识别匹配达到对三维目标识别的目的。
And then , in the simulation of three - dimensional , the application of o - type grid and hybrid grid are used in two relatively complicated structures make the total amounts of grids and the time of grid generation reduced greatly . moreover the hexahedron grids are placed in most areas to provide higher precision . through the comparison between the results of two - dimensional and three - dimensional simulation , we knew two - dimensional calculating is not adequate 本文用简单、方便的二维模型作为数值计算的起点,使用耦合隐式算法以及先进的v2f湍流模型进行求解,成功地捕捉到了激波,观察到主气流从壁面的分离、切换、再附壁等现象,并对计算结果进行了细致的分析,得出一些有意义的结论;在此基础上,本文在国内外首次对超音速射流双稳阀的三维流场进行了计算。
At the last , on the base of that , the author builds up 2 - d model ( modflow ) to simulate numerical value of surrounding underground water changes by tunnel water invasion , researches the effects on surrounding underground water system for tunnel drainage by desiccation , forecasts the restoring cases after the exclusion of water , at the same , analyzes the influences in underground water level and surface collapse by tunnel excavating 并且在此基础上建立modflow二维模型对隧道涌水引起周围地下水变化进行数值模拟,研究隧道疏干排水对周围地下水系统影响,进行模拟并预测堵水成功后水位的恢复情况,最后分析隧道对周围地下水位以及引起的地面塌陷的影响。
Concerning the models for discribing aerodynamic stability of axial flow compressor , the original model is one - dimensional , and it is reasonable for the onset of surge only . for the onset of rotating stall , there are just some two - dimensional models at published literatures . a three - dimensional aerodynamic of compressor has been presented in this paper . an aerodynamic stability model concerning radial disturbance of compressor is presented . the calculated results show that the occurrence of radial disturbance is related to the axial velocity disturbance , which has important effect on aerodynamic stability of compressor . the position of onset of stall , in blade tip or hub , is dependent upon the characteristics of blade element . the comparisons of calculated results predicted by 2d and 3d aerodynamic stability model have also been made in this paper 轴流压气机的气动稳定性模型,最初为一维模型,仅适用于描述喘振发作.对于旋转失速发作,在公开文献中有一些二维模型发表.本文提出了一类考虑压气机径向扰动对失速影响的新的气动稳定性模型.计算结果表明压气机的轴向扰动往往随着径向扰动的产生,径向扰动的强度影响压气机的气动稳定性,在叶尖还是叶根首先产生失速与压气机基元叶栅特性密切相关.本文对轴流压气机二维和三维气动稳定性模型的计算结果进行了对比分析
In this paper ; i set up 2 - dimensions finite element model of piled raft foundations by professional software . the results of caculating many engneering projects show the change of settlement , intemal force and counterforce on pile when parameters are variational . this paper discusses the effects of internal force and the settlement of plate on ground and counterforce on pile of main towers and podiums with settlement joints between them 本文采用专业有限元程序,通过建立二维模型,主要分析和研究了桩筏基础的沉降、内力、桩顶反力等变化规律,讨论了筏板和桩各种参数(筏板形状、厚度、桩长、布桩方式等)对整个基础的沉降和筏板内力的影响。
Based on the principle and method of computing visualization , an easily implementing procedure for dynamic graphic description is proposed . a two - dimensional model of jinhuai bridge has been established in the paper with opengl as graphic tool , and a high - resolution animated cartoon simulation of jinhuai bridge under the moving vehicles has been accomplished 并以opengl为图形工具,建立津淮刚架拱桥的二维模型,对计算得到的大量数据进行合理处理和可视化表达,完成了车辆作用下津淮刚架拱桥的动力响应时程分析的计算机仿真和动画显示,有助于对车桥复杂振动过程的理解和认识。