查询词典 calculus of finite differences

In this paper, the space-time finite element theory and its application technologies are studied and discussed. Furthermore the space-time finite element method is used to analyze the transient characteristics of electromagnetism equipments. The work is important to develop the numerical method for the transient electromagnetic field. The detailed work is as follow.In the basis theory of finite element method used in the transient engineering problem, the functional theory and the finite element theory are applied to studied the existence condition of a generalized variation principle, which is the basis of the space-time finite element method.

本文在完善时空有限元法的基础理论和应用技术并将该方法应用于解决电磁装置的瞬态过程分析等相关方面进行了深入的研究与探讨，该工作对于发展瞬变电磁场问题的数值计算方法具有重要的意义，为此进行了如下几方面的工作：在工程瞬变问题的有限元方法的基础理论方面，本文应用泛函理论和有限元理论，系统讨论了一般工程瞬变问题的变分定理的存在条件及对应的变分定理。

There are differences in upper lip and mentolabial sulcus. For class III malocclusion there are significant differences in lower lip and mentolabial sulcus. There are differences in subnasale . Campared with the facial soft tissue thickness of class II malocclusion , for class III malocclusion there are significant differences in lower lip. There are differences in subnasale and upper lip.

与安氏Ⅰ类错合患者相比，安氏Ⅱ类错合患者的颅面部软组织覆盖厚度在鼻底部有显著性差异，在上唇和颏唇沟有差异；安氏III类错合患者的颅面部软组织覆盖厚度在下唇和颏唇沟有显著性差异，在鼻底部有差异；安氏Ⅱ类错合患者的颅面部软组织覆盖厚度与安氏III类错合患者相比，在下唇有显著性差异，在鼻底部和上唇有差异。

Widely used bases for segmenting include geographic differences, personality differences, demographic differences, use of product differences, and psychographic differences.

广泛用于基地分割包括地理差异，个性差异，人口的差异，使用的产品差异，心理差异。

So we selected the colchicine optimumparameters were 0.2μg/ml and 6 hour cultured duration.The third, there were significantly differences percent between 10 hourgroups and other three groups (4 hour groups, 6 hour groups and 8 hour groups) in0.1μg/ml groups; and there were significantly differences between 8 hour groupsand 10 hour groups, but they had no significantly differences among other twogroups in 0.3μg/ml groups; and there were significantly differences between 10hour groups and 6 hour groups, but 10 hour groups had no significantlydifferences among other two groups in 0.5μg/ml groups; and there weresignificantly differences between 8 hour groups and other three groups in0.7μg/ml groups on the metaphases (P＜0.05), in the experiment of the effect onthe mouse 4- cell embryo stage single blastomere of vinblastine with differentconcentrations and duration, by x~2 statistical analysis.

根据实验的实际情况，适宜制备小鼠8-细胞期胚胎单卵裂球染色体标本的秋水仙素的处理浓度和时间是0.2μg／ml和6小时。3、在确定长春花碱不同处理浓度和时间对小鼠4-细胞期胚胎单卵裂球中期分裂相数影响的实验中，经统计分析，阻断培养0.1μg／ml浓度组中10小时组与其他三组差异显著(4小时组、6小时组和8小时组)；阻断培养0.3μg／ml浓度组中8小时组和10小时组间差异不显著，但与其他两组差异显著；阻断培养0.5μg／ml浓度组中10小时组与6小时组差异不显著，而与其他两组差异显著；阻断培养0.7μg／ml浓度组中8小时组与其他三组差异显著(P＜0.05)。

Symbolic transition graph is proposed as a compact semantic model for the π-calculus processes. The rules which generate such STGs from finite-control π-calculus processes are presented.

提出以符号迁移图为π-演算进程的有穷表示模型，并给出了将有穷控制π-演算进程转换成有穷符号迁移图的全部产生规则。

Using finite fields , the classical groups give rise to finite groups , intensively studied in relation to the finite simple groups ; and associated finite geometry , which has both combinatorial and algebro-geometric sides.

利用有限领域，古典的群体产生有限的群体，深入研究有关的有限简单群体；及相关有限几何，这两个组合和algebro几何双方。

The number of polynomial function over a finite commutative ring. This paper is on the basis of the research for the first question.With the structure of finite commutative ring,we know that a finite commutative ring can be expressed by direct sum of some finite commutative local rings.

本文主要基于对问题一的研究，并由有限交换环的构造可以知道，有限交换环可以由一些有限交换局部环的直和表示，于是就将问题简化到对有限交换局部环上多项式的判定。

Prange first began to study cyclic codes over finite field in 1957 and Berkelamp first began to investigate negacyclic codes over finite field in 1968,but the codes over finite rings didnt received much attention until the 1990s due to the works of Nechaev in 1991 and Hammons in 1994,which showed that well-known nonlinear codes such as Kerdock and Preparata codes are constructed from linear codes over finite rings.

Prange(1957)和Berkelamp(1968)分别首先开始研究有限域上的循环码和负循环码，直到上世纪90年代，Nechaev(1991)和Hammons(1994)通过有限环上的线性码构造出著名的非线性码如Kerdock码和Preparata码，有限环上的码才受到广泛关注。

ECC system makes use of the finite group of elliptic curve on the finite field instead of finite cyclic group used in the discrete logarithm problem. The theory of ECC is being studied a lot and it is the focus of the cryptography and the industrial estate, especially the technique of the implementation of ECC.In this thesis, the meaning of the information technology is discussed firstly, then we analyze the classical cryptography algoritham. After that, the mathematics base of elliptic curve cryptosytems are introduced, especially the theory of the finite field. As for some algorithms, we also give out the program of reliazation.

随后，介绍了研究椭圆曲线密码系统所需要的数学理论基础，特别是有限域中的椭圆曲线理论，并对相关的方法给出相应的实例及其程序实现；论文第三章讨论给出了椭圆曲线密码体制的研究现状，综述了椭圆曲线与现有一些密码算法的结合，介绍了椭圆曲线的离散对数问题以及椭圆曲线面临的攻击，详细描述了椭圆曲线密码系统的实现细节及各个部分的实验数据。

150 Chapter 1 The History and Future of Computers 3.2 Boolean Algebra Table 3-2 Distributivity Idempotency Absorption laws 分配律同一律吸收律 a=ab+ac a+= a+a=a aa=a a+ab=a a=a'=a'b''=a'+b' DeMorgan's laws德摩根定理计算机专业英语 1-151 Chapter 1 The History and Future of Computers 3.2 Boolean Algebra Since a finite set of n elements has exactly 2n subsets, and it can be shown that the finite Boolean algebras are precisely the finite set algebras, each finite Boolean algebra consists of exactly 2n elements for some integer n.

由于n个元素的有限集有且只有个子集由于个元素的有限集有且只有2n个子集，而且很显然有限布个元素的有限集有且只有个子集，尔代数一定是有限集合代数，所以对某个整数n而言而言，尔代数一定是有限集合代数，所以对某个整数而言，每个有限布尔代数也有且只有2n个元素。例如，上文定义的集合T的限布尔代数也有且只有个元素。

I'm not an actor. I'm a professor of paleontology.

我不是演员，我是古生物学教授

Spider Network Web site that is a very image of the name.

网络蜘蛛即Web Spider，是一个非常形象的名字。