对空的

That is, formally speaking, a representation or encoding over an alphabet ∑ of a set D is a function f from D to 2^∑* that satisfies the following condition: f(e1) and f(e2) are disjoint nonempty sets 不相交的非空子集 for each pair of distinct elements e1 and e2 in D.

形式地说，对信息对象集合 D 进行基于字母表∑的物化或编码是从 D 到 2^∑*的函数 f，并且函数 f 满足以下条件：对于 D 内任一对不相同的元素 e1 和 e2，f(e1)和 f(e2)是不相交的非空子集。

With space and time two dimensional signal, a matrix is constructed, and the null space of the matrix is utilized to realize SDMA. The complexity of this technigue is analyzed.

该算法通过对空时二维信号的处理，发送空时二维信号构成一个矩阵，利用矩阵的零子空间以实现空分多址。

The results indicated that tip rounding of blade pressure side could improve flow condition and reduce the probability of gap cavitation while the pump's performance would not be affected significantly.

结果表明，修圆叶片压力面外缘有利于改善间隙流场的流动，可降低间隙空化空蚀的发生，而对泵的总体性能影响不大。

The paper analysis the ballistic trajectory character of the smoke ball and study the air resistance coefficient of the smoke ball.

文中通过对空抛式发烟弹弹道特点和空气阻力的分析，建立了基于控制空抛式发烟弹引信作用时间的终点控制模型，并运用模型进行了计算分析。

The paper analysis the ballistic trajectory character of the smoke ball and study the air resistance coefficient of the smoke ball. Based on the analyze, the paper establishes the terminal control model and uses the model to calculate and analysis.

文中通过对空抛式发烟弹弹道特点和空气阻力的分析，建立了基于控制空抛式发烟弹引信作用时间的终点控制模型，并运用模型进行了计算分析。

SunWukong's struggle art, was congealing the ancient times people's richstruggle experience and the remarkable wisdom, until now has theinspiration and the education significance to us, but Sun Wukongactually was an level more profound tragedy image.

孙悟空的斗争艺术，凝结着古代人民丰富的斗争经验和卓越的智慧，至今对我们有着启发和教育意义，但是孙悟空却是一个层次更深刻的悲剧形象。

Based on the simulation results, the region and the degree of cavitation occurred in the flow passage of the turbine with a low water level at the outlet of the draft tube are examined, the cavitation performance of the turbine is also evaluated.

根据模拟结果，考察了水轮机在低尾水位下运行时流道内空化发生的部位和程度，并对水轮机的空化性能进行了预估。

The computation model had 5 parameters, which could be identified by displacement inverse algorithm. At the same time, the ground deformation limits of highways to determine the engineering treatment scope of goafs were provided. On such a basis, the problem could be solved. Finally, a case of Lei-Yi highway was given. The computed results showed that the present method could successfully solve the ground deformation problems of goafs.

用编制的计算程序对来宜高速公路下覆典型的两种采煤形成的采空区坍塌后地面变形进行了计算分析，计算分析结果表明：随机介质理论计算模型应用比较成功，能反映地面移动规律；该处采空区对高速公路的正常使用产生威胁，宜进行适当的工程处理，并确定了工程处理范围。

And the pressure drop of liquid-layer is mainly influenced by weir height. With the increasing of weir height, the pressure drop increases. And it is independent of bare tower velocity and plate dimension. The correlation before was corrected as follows:ΔpL＝3911Z This paper analyzed the heat transfer coefficient between the outer wall of heat tubes and cooling water. And it was considered that plate geometries、weir height、bare tower velocity and heat flux density would affect the heat transfer coefficient.

而液层阻力主要受堰高的影响，堰高越高，液层阻力越大，与空塔速度和孔板的几何尺寸无关，对以往的公式进行修正后得到实验关联式如下：ΔpL＝3911Z 本文对加热管外壁与冷却水之间的换热系数进行了分析，认为孔板的几何尺寸、堰高、空塔速度以及热流密度均会影响换热系数。

Moldeling and simulation of bubble motion caused by ultrasound using MATLAB The model to describe bubble dynamic motion caused by ultrasound was presented, which included the effects of fluid viscosity, surface tension and vapor pressure of the solvent.

超声空化气泡运动过程模拟及模型的求解建立了超声作用于均相液体中空化泡运动的动力学模型，模型中考虑了液相的动力粘度、表面张力和溶剂的蒸汽压对空化泡运动特性的影响，用MATLAB对建立的普遍化的模型方程进行了数值求解和过程模拟。

We will see more and more activist government policies that distinguish economic activities according to the nationality of the actors.

我们将看到越来越多激进的政府政策，这些政策根据企业的国籍来区分经济活动。

If we can prove the independence of an axiomatic system, then we can guarantee the conciseness of this system, ie.

如果能够证明某个一阶谓词系统的独立性，那么就能够保证该系统的建立是精炼的，即没有任何一条公理或推理规则是多余的。