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Based on monoid comprehension, we presented an extendable object query translation algorithm which can deal with nested subquery, query with existential and universal quantifier, query with aggregate function, query with sort/group. This algorithm converted the query into joins to the utmost to expect different physical implementations of join to raise execution efficiency.

基于幺群概括,我们提出了一个可扩充的对象查询转换算法,该算法可以处理嵌套子查询、带存在量词和全称量词的查询、带聚集函数的查询、带分组/排序的查询,具有较强的通用性,该算法也体现了我们尽可能地将查询转换成连接以期望用连接的多种物理算法提高执行效率的查询优化思想。

The fact is large countries are now less instinctively expansionist than they were in the days of empire.

更重要的是,小国一般都具有更强的同质性,让他们更少地受到内乱和独裁的危害。

The flood activity is one child system in this system, it also has an extremely strong nonlinearity relation with the weather system, and it is very difficult for the analysis means based on explicit function and linear measure and the mathematical model in simulating the gradual progress course and gradual progress method of flood reasonably.

水文水环境系统是一类与自然资源、生态环境和社会活动紧密相关的、极其复杂的大系统,洪水活动作为该系统的一个子系统,还与天气系统具有极强的非线性相关关系,这使得基于显函数和线性假设的分析手段与数学模型很难合理地模拟洪水的演进过程和演进规律。

By reason of the dipole directivity of particle velocity sensor and also the acoustic intensity averagor, and its being able to realize the electronic rotation, coherent interferences can be effectively suppressed by skillful use of its zero point and extremal point.

振速传感器和平均声强器具有偶极子指向性,并且该指向性可实现电子旋转。巧妙利用偶极子指向性的零点和极值点,可有效地抑制声场中的相干干扰。

It is of importance to capture the extreme value distribution of dynamic stochastic response of structures for reliability evaluation of engineering structures.

1引言 在工程实践中,结构的参数或激励往往具有很强的随机性,因而导致结构动力响应是一个随机过程,这使得有效地把握结构的动力反应特别是非线性动力反应和结构动力可靠度迄今为止仍是相当困难的课题t','〕。

The system is robust to the information uncertainty,and can decrease the false alarm.

该系统对信息不确定性具有较强的鲁棒性,能够充分地抑制虚警。

The research approach advanced in this dissertation has been verified by practical data of Shuanghe Oilfield, and the results can describe the characteristic of fan delta front reservoir spatial distribution accurately. Therefore, the results of this paper not only have great theoretical significance, but also have important role for practical application in Shuanghe Oilfield.

经油田的实际数据验证表明,本文的研究方法能较准确地刻划扇三角洲前缘储层的空间分布特点,研究成果不仅具有较强的理论意义,而且具有重要的实用价值

In chapter 2, the methods of spin dynamical simulation and fast Fourier transformation are introduced.

第二部分共有三章:第一章,我们简要地介绍该领域的一些背景和一些前人的工作;第二章,我们介绍自旋动力学模拟的方法和模拟计算中要用到的快速傅立叶变换方法;第三章,我们提出了两种有效钉扎Spin vortex的办法,一个是通过打孔的办法,另一个是通过小面积加垂直强磁场的办法。

To provide methods for the study of laser rapid prototyping system based on polar coordinates, especially it apply to featheredge spheroid parts; The make-up of SLS rapid prototyping system based on polar coor.

本文基于激光变长线快速成型系统和激光点扫描快速成型系统的特征,激光选区烧结成型工艺因其适用于中小型零件,且选用材料广泛,对其研究具有现实意义;为基于极坐标系的激光快速成型系统的研究提供了素材,特别是对于薄壁回转体零件具有较强的针对性;详实地讨论了基于极坐标的激光选区烧结系统的组成。

The terracedly descending shape in east slope of Tai hang is one of the most important factors that influence the foehn formation in this area.

数值模式的结果部分地证实了阿尔泰背风气旋的气候特征,指出它在生成的初期即已较强,此后不再随时间发展和加深。

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推荐网络例句

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在,'歼灭战perfuming自己与胡努特,那麼,他来到和SAT 。

The shamrock is the symbol of Ireland and of St.

三叶草是爱尔兰和圣特里克节的标志同时它的寓意是带来幸运。3片心形叶子围绕着一根断茎,深绿色。