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[期刊论文] 作者:Michelle A.Poolet 贾笑明(译), 来源:Windows IT Pro Magazine: 国际中文版 年份:2007
NULL果真如传说中那般用不得?站在基于性能的数据库设计角度面对NULL的选...
[期刊论文] 作者:ZHANGLi-Feng ZHANGYuan-Zhong, 来源:理论物理通讯:英文版 年份:2004
We study the null bulk geodesic motion in the brane world in which the bulk metric has an un-stabilizedextra...We find that the null bulk geode...
[期刊论文] 作者:Kai Shi,Xuan Wang,Yihong Xiu,Hongbao Zhang, 来源:理论物理通讯(英文版) 年份:2021
By imposing the boundary condition associated with the boundary structure of the null boundaries rather...find for Einstein\'s gravity that the variational principle works only in its submanifold with the null...
[期刊论文] 作者:LIANG Xinyuan, 来源:校园英语·月末 年份:2019
Ⅰ.Background of null subject acquisition research  Han Jingquan (1997) takes the phenomenon of null object...
[期刊论文] 作者:黄爱辉, 来源:计算机系统应用 年份:2005
本文介绍了在VFP怎样使用NULL值来确定字段的值,NULL值在表中字段的使用方法....
[期刊论文] 作者:David Trafimow, 来源:统计学期刊(英文) 年份:2017
An important problem with null hypothesis significance testing, as it is normally performed, is that...it is uninformative to reject a point null hypothesis [1]....
[期刊论文] 作者:郭璐, 来源:教育界·上旬 年份:2013
【Abstract】In this paper, based on the null categories and VP-shell light verb inthe Minimalist Program...of Chomsky, the author proposed the concept of null verb be in Chinese and then studied the text...
[期刊论文] 作者:高燕良,张昆龙, 来源:运筹与模糊学 年份:2019
本文引入格上Null–范数的概念,从Null–范数的不同区间的取值入手进行讨论,证明了有界格上的Null–范数的构造方法有且仅有三种,并给出了三种Null–范数的大小关系。...
[期刊论文] 作者:WANG HuoYun,LIU Xin,FU HeMan, 来源:中国科学:数学英文版 年份:2013
A dynamical system is called a null system, if the topological sequence entropy along any strictly increasing...
[期刊论文] 作者:ZhuangLiu,YanGong, 来源:ChineseOpticsLetters 年份:2013
Toroidal surface and biconic surface are employed increasingly, however their profile cannot be null...Null testing method with cylinder compensator is proposed to solve this problem. The theory of th...
[期刊论文] 作者:洪东忍, 来源:福建教育学院学报 年份:2012
在Oracle的数据库开发过程中,有很多容易出现的错误都与NULL的使用有关。文章在多个Oracle数据操作实验的基础上,讨论了NULL的正确使用,其中包括NULL的概念、判定、数据更新...
[期刊论文] 作者:Gui-fang Peng,You-xing Cui, 来源:美中教育评论:A 年份:2021
With respect to the students,society,and knowledge development,the null curriculum is defined as the...
[会议论文] 作者:Xue Donglin, 来源:第十届全国激光技术与光电子学学术会议 年份:2015
Null lens are always used to test large convex aspheric mirror.For large convex aspheric mirror with...large deviate wavefront from the aspheric wavefront to its best sphere wavefront,traditional null l...
[期刊论文] 作者:, 来源:Chinese Journal of Astronomy and Astrophysics 年份:2005
Employing the Poincare index of isolated null-points in a vector field, we worked out a mathematical...method of searching for 3D null-points in coronal magnetic...
[期刊论文] 作者:Tao XIE,Xiaokun ZHU,Kezheng ZU, 来源:数学研究及应用:英文版 年份:2016
This paper establishes some new equalities and inequalities for the null and column spaces of combinations...
[期刊论文] 作者:Hui Zhao Jing-Xiu Wang Jun Zha, 来源:中国天文和天体物理学报:英文版 年份:2005
Employing the Poincaré index of isolated null-points in a vector field,we worked out a mathematical...method of searching for 3D null-points in coronal magne...
[期刊论文] 作者:刘振威,, 来源:Journal of Electronics(China) 年份:1984
The antenna array pattern null steering is one of the important current topics in the array synthesistheory...
[期刊论文] 作者:Cheikh Seck,Mame Libasse Laye Ane, 来源:应用数学与应用物理(英文) 年份:2021
The aim of this work is to improve the minimum time of null controllability of the 1D heat equation by...In fact, motivated by the work of Khodja on the null controllability of the heat equation and of El Jai...
[学位论文] 作者:高燕良,, 来源:中央民族大学 年份:2019
本文主要研究了有界格上的Null-范数,以及在有界的多边形链格上的幂等的Null-范数的构造方法,接着提出了五个与序同构的定义等价的条件并进行证明.第一章为引言,简述本论文的研究背景,研究现状,主要研究结果及创新之处....第二章中,介绍了本论文需要用到的一些相关的定义与定理.第三章中,第一节从Null-范数的不同区间的取值入手进行讨论,证明了有界格上的Null-范数的构造方法有且仅有三种.第二节中否定...
[会议论文] 作者:MinzhiZhao;, 来源:The Third IMS-China International Conference on Statistics a 年份:2011
  This paper is devoted to study the first returning speed of null recurrent Markov chains.Firstly, we...
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