方向

Displacement of earth bag during sinking down and specialties of sinking of lead cage. This paper analyzes characters of long tube bag in the same direction and contradictorily.

分析了长管袋在垂直水流方向和顺水流方向抛掷的受力特点，并推出了管袋位移及转角公式。

By the analysis of heat transfer between air and wall in vertical direction and the mechanism of air flow in large space building, this paper provides a theoretical model that the air temperature in vertical direction can be divided into three zones: temperature-constant air-conditioning zone, main convection zone and top heat stagnation zone.

通过对大空间建筑室内垂直方向上空气与壁面换热和流动机理分析，提出了空气温度在垂直方向上划分为等温空调区、对流主区域、顶部热滞留区域三个区域，建立了对流主区域、顶部热滞留区域求解空气温度的数学模型，推导得到了相应的分析解，提出了计算大空间建筑室内垂直温度分布简易模型。

It is pointed out that optimal solution of linear programming can be represented as a sum of a convex combination of the optimal extreme point s and a nonnegatively linear combination of the optimal extreme directions.

本文指出了线性规划的最优解可表示为最优极点的凸组合和最优极方向的非负线性组合之和，确定了最优极方向存在的条件。

On a convex surface, the pressure is less than

在凸面上，底面压力变小，向心力与水的自重方向一致；在凹面上，底面压力变大，向心力与水的自重方向相反。

Company at this stage by virtue of strong research and development and many years of industry experience, has gradually formed a set of Flash technology as the core of the application to store, read and write, play and technology-oriented to product function, appearance, modeling for means the direction of product development, is committed to creating fashionable digital products, and initial results.

公司现阶段凭借雄厚的研发实力和多年的行业经验积累，已逐渐形成了一套以Flash的应用技术为核心，以存储、读写、播放技术等为方向，以产品的功能、外观、造型为手段的产品研发方向，致力于打造时尚数码精品，并初见成效。

Third, the discussion of the corresponding relationship of the real angles to the apparent real angles is performed, the asymptotic bias and MSE of real angles are given. Fourth, based on above conclusions, the analysis of two typical cases is made by numerical analysis and computer simulation: Case A when the impinging signals are divided into desired signals and interfering signals: it is shown that similar to Cyclic estimation of DOA, the smaller the separation between interfering direction and signal direction, in general, the smaller the estimation variance.

首先，研究了无穷快拍时信号数目有误的最大似然估计，引入了视在真实角度的概念；其次，导出了视在真实角度最大似然估计大样本时的分布以及渐近均方误差的解析表达式，而且还证明了：Stoica性能分析结果是现在的分析结果在信号数目准确时的特例；第三，讨论了真实角度与视在真实角度的关系，给出了真实角度的渐近偏和渐近均方误差；第四，依据前面的结果，利用数值分析和模拟实验的方法对两种典型情况做了分析： 1 在入射信号被分为干扰信号和所需信号情况下：结果表明：与CyclicDOA估计一样，干扰方向与所需信号方向靠的越近，所需信号估计的方差越小，越远离，方差越大。

A kind of best baffle-beard suitable for applications in the dual-frequency base station antenna is presented, meanwhile, we adopt the PSO algorithm to optimize the parameters affecting antenna pattern such as the phase of the elements, the space between the elements, such that the pattern of antenna can be shaped in the vertical plane （the pattern in the vertical plane has Cosecant beam in the service area）.

针对我国移动通信频率，以基站天线的双频工作以及阵列波束赋形为目标，设计了一种满足基站天线双频辐射要求的最佳反射板形状，并通过PSO全局优化算法优化各单元馈电相位并调整其间距以实现垂直面方向图双频波束赋形的目的（即垂直面方向图在所覆盖的服务区域内具有余割波束）。

To resolve the question about direction cosine when three-COMERO produced by COORD3 works, the formula of direction cosine of every probe is demonstrated in geometrical relationship from the explanation about gauging and qualification of probe, which provides academic proof for the probe worked correctly.

摘 要：针对COORD3公司三坐标测量机使用中有关方向余弦的疑点，从探针的标定和校正入手，对每个探针的方向余弦公式进行了几何关系上的论证，为探针的正确使用提供了理论依据。

The principle of work is: When ambient temperature rises, the pressure of the SF6 gas increases, drives the indicator along the clockwise rotation, but at the same time, the mouth of the bimetal compensation system "the U shape" publicizes, then impels the indicator to the counter clockwise rotation, when two kind of strength be equilibrium, the ambient temperature change cannot made the indicator deflection.

工作原理是：当环境温度上升时，虽然容器内SF6气体的密度未发生变化但其压力增大，带动指针顺时方向转动，而当温度上升时，双金属补偿装置的"U形"口张大，则推动指针向逆时针方向转动，当两种运动引起表针的偏转量相抵销时，无论环境温度如何变化，指针都不会发生偏转。

Otherwise, When ambient temperature falls, the pressure of the SF6 gas decreases, drives the indicator counter the clockwise rotation, but at the same time, the mouth of the bimetal compensation system "the U shape" reduces, then impels the indicator to along the clockwise rotation, when two kind of strength be equilibrium, the ambient tempera

反之，当环境温度下降时，虽然容器内SF6 气体的密度未发生变化但其压力减小，带动指针向逆时方向转动，而当温度下降时，双金属补偿装置的"U 形"口缩小，则推动指针向顺时针方向转动，当两种可运动个起表针的偏转量相抵销时，无论环境温度如何变化，指针都不会发生偏转。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。