有限

A criterion theorem of having no finite coverings for a finitely generated module M over a semisimple ring R is given.

对半单环上有限生成左模给出一个无有限覆盖的判定定理。

Not every subgroup of a D-group is also a D-group. If a subgroup is a D-group we call the subgroup "sub- D -group." The "commutator ideal" of G is the smallest sub-D-group containing its commutator subgroup. We found that the commutator ideal can be viewed as a finitely generated module over a ring when G is a finitely generated metabelian D-group.

并非每个子群都是一个可除群，若一个子群是可除群，我们称之为子可除群(sub-D-group)，而G 的交换子理想则是在G中包含其导出群的最小子可除群，我们发现当G是一个有限生成亚交换可除群时，其交换子理想是一个有限生成模。

In this connection we have not taken account of the inaccuracy involved by the finiteness of the velocity of propagation of light.

关於这一点，我们没有带被光的增殖速度的有限是积极叁与的错误帐户。{关於这一点，我们还没有带被光的增殖速度的有限是积极叁与的错误帐户。

The authors first infered the boundary condition for line source,then realised the forward calculation with finitedifference method.

针对垂直有限线源，首先推导了线电流源的边界条件，利用有限差分实现了三维地电场的正演。

There is a detectable amount of radial distortion but that is to be expected with an eyepiece of this type,(It would be interesting to use a field flattener and see the difference it makes), and there was also a very limited amount of lateral color present when looking at the moon and I do stress limited.

有一个检出量为径向畸变，但这种情况是可以预期的目镜这一类型(这将是很有意思的使用领域 flattener 看到差距使得)还有一个非常有限，横向色目前在看月亮，而我压力有限。

This course will introduction two numerical methods on fluid mechanics mainly: finite difference method and finite cell method.

本课程重点介绍流体力学的两大数值方法：有限差分法和有限单元法。

E. , the Frechet derivative is the first order of Zhang's integrated geometric factor. With the help of FEM, the calculation of the Frechet derivative is carried out conveniently, and its efficiency and accuracy are recommendable.

同时给出了均匀背景条件下Frechet导数结果，并且巧妙地解决了利用有限元素法计算Frechet导数的问题，获得了较高的运算效率和计算精度，从而使经典的有限元素法具备了求解测井响应和进行Frechet导数精确计算的双重功能。

Our studies mainly focus on the free groups with finite ranks . Free groups with finite ranks are the fundamental subjects of combinatorial group theory, and they have central importance for the studies of both topology and algebra.

我们研究比较多的是有限秩的自由群，有限秩自由群是组合群论的中心课题，是一个在拓扑学及代数学上都具有重要意义的研究对象，获取有关这些自由群的结构的信息的一个主要方法是研究其上的各种自同构作用。

Because the hardware and software may be implemented quickly if wechoose proper normal bases to represent finite fields. In this paper, we first introducesome basic definitions and facts on normal bases over finite fields, then extend theseresults to any Galois extension fields.

在这篇文章中，我们先介绍了有限域上的一些基本定义及关于正规基的相关结论，进而将域扩张到一般的伽罗瓦扩域中，得到了伽罗瓦扩域中正规基与其对偶基等价的充分必要条件，从而将有限域上正规基的等价条件推广到任意伽罗瓦扩域上。

In the face of above cases, this paper attempts to break through the bottleneck of data security with another way. Through study of Error Correction Code and Finite Field theoretics, this paper tries to apply the Reed-Solomom arithmetic based on Finite Field Galois Field to Redundant Array of Independent Disk, and tries to realize a simple RAID6 level programme, thereby could offer an idea for securer storage device.

面对这样的现实情况，本文试图换个角度突破这个安全瓶颈，通过对纠错编码理论及有限域数学理论的一步步深入研究，尝试将基于有限域数学的Galois域Reed-Solomon算法应用到RAID(Redundant Array of Independent Disk 独立冗余磁盘阵列)磁盘阵列当中，并尝试实现小型的RAID6级别的实验程序，从而为实现更加安全的存储技术提供了思路。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。