基于D-R矩阵的电阻网络化简

针对复杂电路采用D-R矩阵对电阻网络进行化简,通过建立邻接矩阵(Adjacency Matrix)和关联矩阵(Modified incidence matrix)简化电路,并以此为根据,按照一定的顺序进行判断和化简。     

Simplification and Experimental Verification for Temperature and Humidity Field Coupling Model of Conservatory Soil

Based on the surface energy balance model which is widely used abroad, a temperature and humidity field coupling model of conservatory soil without crop vegetation in full illumination was established. Considering the relatively closed environment in conservatory, weak solar radiation and little surface evaporation of soil, the daily variation of water content in different soil layers may be neglected, then the temperature and humidity field coupling model was simplified to a one-dimensional thermal diffusion model. The simplified model and the temperature and humidity field coupling model adopted the same computational method of soil physical parameters and discrete format of heat diffusion differential equations, and were applied to the continuous simulation of temperature field in conservatory soil without crop vegetation in full illumination. Through the comparison between simulation results and experimental data, the precision of the simplified model was verified. The typical rule of soil heat flux variation in a 24 h cycle was also obtained.     

船舶管路布置仿真模型简化

为实现利用人工智能技术进行自动化管路布置,在对已有文献进行研究的基础上,给出布置环境及其设备的简化和表达方法.利用完整信息模型表示障碍,克服为检验模型边界而进行的大量计算;通过对布置环境的分割,快速建立近似布置平台,使模型数量最少.实例验证简化方法在应用中的精度和效率.     

一种面向iOS系统的双缓冲改进算法及其应用

为提高面向iOS(iPhone operating system)系统的矢量地图数据渲染效率,研究针对小尺寸屏幕的移动设备的矢量数据简化算法,以传统的Douglas-Peucker矢量简化算法和切分重组压缩法为基础,讨论结合屏幕像素、容忍时间等因素确定简化限值的方法.另外,基于对Quartz 2D引擎的渲染流程及双缓冲技术使用的效率问题的研究,提出改进的双缓冲渲染算法.实验结果显示,改进后的算法与传统算法相比,渲染效率有所提高.     

根据惠更斯原理画折射光线

从波动光学的角度，用惠更斯原理解释了光的折射现象，根据惠更斯原理所作的折射光线进行简化，得出较为简单的作图方法。     

英语基本句型研究

语法是英语的核心,而英语五种基本句型是英语语法的核心。本论文分析了英语的五种基本句型SVCs,SV,SVO,SVO iOd,SVOCo的特征及其用法,并且指出英语中不管多复杂的句子都可以简化成这五种基本句型,这对语法研究和学习具有重要的意义。     

邯郸方言入声韵母的简化

在实地调查的基础上,记述了晋语邯新片的邯郸方言近百年来入声韵母的简化过程,报告了新的语言事实,讨论分析了入声韵母简化的方向、简化顺序及其制约因素、简化速度和简化原因.     

Influence of football size on kicking performance in youth Australian rules footballers

In Australian rules football structured increases in ball size during development end with the transition to the Size 5 (adult) ball at the Under-15 age group. This study assessed changes in kick technique and performance in experienced junior performers when using Size 4 and 5 Australian rules footballs. Participants (n = 22, 13.77 ± 0.61 years) performed drop punt kicks in 2 representative tasks; a Decision-Making Test (DMT) (n = 14) and Set-Shot Test (SST) (n = 14 + 8). Results indicate participants sustained their level of kick performance (accuracy and quality of ball spin) in both tests when using a Size 5 football. Sustained kick performance in the DMT primarily resulted from adaptations to time-point technical measures at ball release. No significant differences were detected for technical measures between ball sizes in the SST. A dynamic kicking task (DMT) in combination with ball size manipulation may have placed greater demand on skill execution in comparison to a self-paced kicking task (SST). Results provide initial support for the utility of challenging representative dynamic and self-paced tasks, such as the DMT and SST used here for Australian football, for skill testing and practice in sport     

电阻混联电路等效化简

等效电路分析是电路分析中一个重要的内容。本文介绍了三种快速简单的特殊分析方法：重排电路法、假设电流法、等电位节点法。     

顶点覆盖问题的贪心算法在网格简化中的应用研究

针对三角网格简化,设计了求解顶点覆盖问题的贪心算法,通过贪心选择最小的顶点集去＂覆盖＂边集,同时保留被简化网格的特征信息,自动实现最大程度简化。给出的实例也表明简化后的网格质量良好,算法既降低了时间复杂度又保持了原形状的特征信息。