是“系统”而不是“粒子”——关于波函数描述中的一个提法     

王宇青 《雁北师范学院学报》1994,(2)

在量子理论中,当粒子的波函数给定后,粒子所有力学量的观测值和几率分布不一定确定,还与粒子所处的外界环境有关  相似文献   

基于3dsMax PFlow的建筑常用材料破碎研究     

李虹江 《教育技术导刊》2020,19(3):238-243

随着3dsMax软件功能逐步完善,内置的粒子系统在实现粒子碰撞模拟上有了新的突破,解决了三维动画难以实现特效的问题。为提高建筑倒塌特效的真实性和可控性,基于3dsMax Particle Flow粒子系统,设计了混凝土、木料、砖块、玻璃等常用材料的破碎动画。通过反复测试,提炼出容积压裂方式和粒子流搭配方式。与传统粒子爆炸相比,Particle Flow模拟的破碎效果更真实,拓展性高、可控性强,为实现大型建筑倒塌特效研究建立了理论基础,同时也为特效工作人员提供了一个有效手段。  相似文献   

Parameter estimation of cutting tool temperature nonlinear model using PSO algorithm   总被引：2，自引：0，他引：2  

刘益剑张建明  王树青 《浙江大学学报(A卷英文版)》2005,6(10):1026-1029

INTRODUCTION In modern metal cutting theory,research on cutting tool is one of the major concerns.To under-stand the characteristics of a new cutting tool,many experiments(such as cutting force experiment,cut-ting temperature experiment,anti-striking experiment,etc.)should be conducted to obtain an enormous amount of experiment data.The development of a proper cutting tool temperature model is a very dif-ficult task due to the large number of interrelated parameters(cutting speed,feed,dept…  相似文献   

Primary Teachers’ Particle Ideas and Explanations of Physical Phenomena: Effect of an in‐service training course     

George Papageorgiou  Dimitrios Stamovlasis  Phil Michael Johnson 《International Journal of Science Education》2013,35(5):629-652

  相似文献   

磁法勘探大别山区探矿中的应用     

胡昌安 《科技广场》2012,(2):73-76

本论文介绍了安徽省大别山区铁矿磁异常数据的处理及解释。论文首先对网格化的野外原始磁异常数据进行滤波处理,以消除测量的偶然误差和近地表不均匀磁性体的干扰。然后,对上述预处理后的磁异常数据进行解析延拓,本论文作了三个不同高度的向上延拓及两个不同高度的向下延拓。通过上述数据处理,结果表明,利用这种滤波和解析延拓方法对确定地下异常体与预测成矿区是很有成效的。  相似文献   

基于ERDAS IMAGINE9.2操作平台的遥感图像融合概述     

洪梅 《科技广场》2012,(3):56-59

随着遥感技术的迅猛发展,各种遥感数据相应呈现。如何让数据得到充分的应用？数据融合在当今社会显得越来越重要;如何更好地对数据进行融合？我们必须了解各种融合方法的优缺点。本文介绍了ERDAS IMAGINE9.2操作平台上的几种遥感图像融合,分别是分辨率、小波变换、改进IHS、高通滤波融合,并通过实验比较几种融合方法的优缺点以及探讨未来可能研究方向。  相似文献   

离散小波变换和两通道滤波器组     

刘志国  王亚利 《安阳师范学院学报》2005,(5):19-21

对小波变换和滤波器组理论给出描述,对两者的关系进行讨论,最后介绍了反映两者关系的最新成果.  相似文献   

影响学生情感过滤的大学英语教师因素分析     

秦磊  胡加圣 《现代教育技术》2010,20(6):59-62

文章以人本主义教学和情感过滤假说为理论依据,利用主成分分析法探讨了多媒体大学英语课堂影响学生情感过滤的教师因素,以及对大学英语课堂教学的启发,提出教师把积极情感因素渗透到多媒体辅助教学模式中的相关策略。  相似文献   

分布估计算法在多维函数优化中的应用     

谷月霞 《武汉职业技术学院学报》2010,9(1):54-56

分布估计算法是一类新的进化算法,它通过统计在当前群体中选出的个体信息给出下一代个体分布的概率统计,用随机取样的方法生成下一代群体。文章将建立在一般结构Gauss网络上的分布估计算法应用于多维函数的优化并与传统的粒子群优化算法进行了比较。仿真实验结果表明,分布估计算法可以在很短的时间内收敛至全局最优解,避免了传统算法的不足,提高了函数优化的准确性。  相似文献   

Assessing 16-Year-Old Students’ Understanding of Aqueous Solution at Submicroscopic Level     

Iztok Devetak  Janez Vogrinc  Sa?a Aleksij Gla?ar 《Research in Science Education》2009,39(2):157-179

Submicrorepresentations (SMR) could be an important element, not only for explaining the experimental observations to students, but also in the process of evaluating students’ knowledge and identifying their chemical misconceptions. This study investigated the level of students’ understanding of the solution concentration and the process of dissolving ionic and molecular crystals at particulate level, and identifies possible misconceptions about this process. Altogether 408 secondary school students (average age 16.3) participated in the study. The test of chemical knowledge was applied and the analysis of four selected problems related to drawing SMRs in solution chemistry is presented. Selected students were also interviewed in order to gain more detailed data about their way of solving problems comprised in the knowledge test. The average achievement on solution chemistry items was only 43%. It can be concluded from the results that students have different misconceptions about arrangements of solute particles in the solution and presentation of its concentration at particulate level. Students show quite low achievement scores on the problem regarding drawing the SMR of ionic substance aqueous solution (7.6% correct answers) and even lower ones on the problem regarding drawing the SMR of diluted and saturated aqueous solutions of molecular crystal (no completely correct answers). It can be also concluded that many different misconceptions concerning the particulate level of basic solution chemistry concepts can be identified. In the conclusion some implications for teaching to reach a higher level of understanding of solution chemistry are proposed.  相似文献