期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
归一化主成份及应用 被引量:3
1
作者 韩天锡 刘晓琴 《天津师大学报(自然科学版)》 1999年第4期29-32,共4页
本文提出了归一化主成份的概念和计算方法,并介绍了它的性质. 利用归一化主成份可以解决一类带有约束条件的降维问题. 最后给出了一个应用实例.
关键词 主成份 特征向量 归一化 综合评价 主成份分析法
下载PDF
Several Considerations about Quantum Mechanics
2
作者 Zhonggang Li 《World Journal of Mechanics》 2021年第4期53-70,共18页
This article has demonstrated the possibility of deriving an equivalent mathematical velocity expression while setting aside the concepts of displacement and time. The proposed velocity formula, better aligned with re... This article has demonstrated the possibility of deriving an equivalent mathematical velocity expression while setting aside the concepts of displacement and time. The proposed velocity formula, better aligned with reality, allows a better understanding of the equivalence of matter and energy, which are comprised of the same type of basic particles. Why, then, is there a significant difference between matter and energy? This is because the combination of the basic particles is not the same. Basic particles are the basic unit of mass and energy, meaning mass and energy conservations are essentially the conservation of these basic particles. Electrons, photons, neutrons, protons, neutrinos, and other microscopic particles also consist of these basic particles. The basic particles are also the basic foundation of force: a basic particle force is the smallest force in the universe, implying that force is not continuous, but a basic particle force is the smallest unit of force. The total mass of a moving body increases with increasing velocities, and this added mass is composed of the basic particles provided by an external system. These basic particles are the foundation of the universe, and determine that physical concepts are vectors or scalars. Velocity, a vector, is the ratio between the basic particles. The concept of time is essentially academic. Although relativity equations may satisfy mathematical principles, they may represent a mathematical model with no physical meaning, not demonstrating objective physical facts. 展开更多
关键词 MASS Energy VELOCITY CONCENTRATION foron The Theory of Relativity
下载PDF
高等数学中几个难点问题的探讨
3
作者 兰艳 《长沙大学学报》 2006年第2期100-101,107,共3页
一元函数微积分学是高等数学的基础,直接影响学生数学素养的培养.讨论和分析了一元函数微积分学中的几个典型难点问题,探讨了一些教与学的方法,为改进教与学的效果提供参考.
关键词 高等数学 一元函数微积分 一题多解
下载PDF
全域旅游背景下旅游服务专业群课程体系的构建 被引量:3
4
作者 陈文娟 《创新创业理论研究与实践》 2019年第14期67-68,共2页
课程体系建设是中等职业学校专业群建设与改革的关键要点。该文探讨在全域旅游产业群视角下旅游服务专业群课程体系建设的思路和方案,为推进专业群改革提供思路。
关键词 中职 旅游服务专业群 课程体系 全域旅游
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部