协变性
协变性的相关文献在1963年到2020年内共计84篇,主要集中在物理学、力学、自然科学理论与方法论
等领域,其中期刊论文83篇、会议论文1篇、专利文献6246篇;相关期刊67种,包括青春岁月、西昌学院学报(社会科学版)、合肥师范学院学报等;
相关会议1种,包括中国运筹学会第七届学术交流会等;协变性的相关文献由130位作者贡献,包括李金鑫、金东星、吴齐全等。
协变性
-研究学者
- 李金鑫
- 金东星
- 吴齐全
- 廉晋
- 朱慧霞
- 杨达中
- 柯永权
- 石会萍
- 籍延坤
- 肖峻
- 郭亮
- 陈涛
- AN Ran
- HU Wenfeng
- NING Kai
- SUN Jie
- WANG Naiang
- ZHANG Xunhe
- ZHAO Liqiang
- 严亮
- 于全训
- 伍林
- 何卫中
- 余勇
- 余寿绵
- 余恬
- 倪振成
- 凌寅生
- 刘娅
- 刘希亮
- 刘平
- 刘晓慈
- 刘泽文
- 刘琼汝
- 包景东
- 华安增
- 卢国愿
- 卢敏
- 叶海荣
- 吕付国
- 吴振声
- 吴正中
- 吴波
- 吴鹏
- 周培源
- 周玉萍
- 唐旭东
- 唐琪珊
- 姜晓宜
- 姜根山
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SUN Jie;
HU Wenfeng;
WANG Naiang;
ZHAO Liqiang;
AN Ran;
NING Kai;
ZHANG Xunhe
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摘要:
Exploring the surface energy exchange between atmosphere and water bodies is essential to gain a quantitative understanding of regional climate change, especially for the lakes in the desert. In this study, measurements of energy flux and water vapor were performed over a lake in the Badain Jaran Desert, China from March 2012 to March 2013. The studied lake had about a 2-month frozen period(December and January) and a 10-month open-water period(February–November). Latent heat flux(LE) and sensible heat flux(Hs) acquired using the eddy covariance technique were argued by measurements of longwave and shortwave radiation. Both fluxes of longwave and shortwave radiation showed seasonal dynamics and daily fluctuations during the study period. The reflected solar radiation was much higher in winter than in other seasons. LE exhibited diurnal and seasonal variations. On a daily scale, LE was low in the morning and peaked in the afternoon. From spring(April) to winter(January), the diurnal amplitude of LE decreased slowly. LE was the dominant heat flux throughout the year and consumed most of the energy from the lake. Generally speaking, LE was mostly affected by changes in the ambient wind speed, while Hs was primarily affected by the product of water-air temperature difference and wind speed. The diurnal LE and Hs were negatively correlated in the open-water period. The variations in Hs and LE over the lake were differed from those on the nearby land surface. The mean evaporation rate on the lake was about 4.0 mm/d over the entire year, and the cumulative annual evaporation rate was 1445 mm/a. The cumulative annual evaporation was 10 times larger than the cumulative annual precipitation. Furthermore, the average evaporation rates over the frozen period and open-water period were approximately 0.6 and 5.0 mm/d, respectively. These results can be used to analyze the water balance and quantify the source of lake water in the Badain Jaran Desert.
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王雯宇;
王丝雨;
许洋
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摘要:
This paper mainly talked about the importance of covariance in the course of college physics and field theory.We used a figure to show that how to understand the Lorentz Transformation at the end of the course of Electromagnatics.Then we showed that Levi-Civita antisymmetric tensor is invariant under a transformation matrix which determinant equals one,thus εμvρσ is a Lorentz covariant tensor,vector and axial-vector have different mirror transformation.At last,we argued that a physical variable will have different properties of covariance under different formulation.As a demonstration,we showed the difference and the relation in the understanding on the cross section in quantum field theory.%本文主要论述了物理量的协变性质在大学物理和场论教学中的重要性.首先以图示的办法形象地讲解电磁场的洛伦兹变换,同时指出协变性的理解可以使学生更加深刻理解电磁学理论的本质.论文证明n阶反对称张量在行列式为1的矩阵变换下是不变的,因此四阶反对称张量εμνρσ自然是协变的,矢量和轴矢量的镜像变换性质是不一样的.论文还指出协变性是对物理公式变换性质的表述,物理量会因为形式不同而有不同的协变性的理解.论文以场论散射截面的协变性质为例,指出不同理解的差别与联系.
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张向东;
高作峰
- 《中国运筹学会第七届学术交流会》
| 2004年
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摘要:
本文主要就妥协值在有限制(带合作指标)对策上的推广进行研究.本文研究问题时只考虑那些能形成的联盟,或者说只考虑那些合作指标为正的联盟,我们称之为可行联盟.这样就相当于本文建立的模型是在有限制的联盟上研究对策的解的问题,是经典模型的更一般化研究.本章在TU对策类上讨论带合作指标对策的问题及性质.
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张向东;
高作峰
- 《中国运筹学会第七届学术交流会》
| 2004年
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摘要:
本文主要就妥协值在有限制(带合作指标)对策上的推广进行研究.本文研究问题时只考虑那些能形成的联盟,或者说只考虑那些合作指标为正的联盟,我们称之为可行联盟.这样就相当于本文建立的模型是在有限制的联盟上研究对策的解的问题,是经典模型的更一般化研究.本章在TU对策类上讨论带合作指标对策的问题及性质.
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张向东;
高作峰
- 《中国运筹学会第七届学术交流会》
| 2004年
-
摘要:
本文主要就妥协值在有限制(带合作指标)对策上的推广进行研究.本文研究问题时只考虑那些能形成的联盟,或者说只考虑那些合作指标为正的联盟,我们称之为可行联盟.这样就相当于本文建立的模型是在有限制的联盟上研究对策的解的问题,是经典模型的更一般化研究.本章在TU对策类上讨论带合作指标对策的问题及性质.
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张向东;
高作峰
- 《中国运筹学会第七届学术交流会》
| 2004年
-
摘要:
本文主要就妥协值在有限制(带合作指标)对策上的推广进行研究.本文研究问题时只考虑那些能形成的联盟,或者说只考虑那些合作指标为正的联盟,我们称之为可行联盟.这样就相当于本文建立的模型是在有限制的联盟上研究对策的解的问题,是经典模型的更一般化研究.本章在TU对策类上讨论带合作指标对策的问题及性质.