方向标

A new metric form is chosen to study the Weingarten translation surfaces which are translating in the two null directions in a pseudo orthogonal frame.

在伪正交标架下，选取一种新的度量形式，对沿两个类光方向平移的平移Weingarten曲而进行了研究。

The life table analysis in the laboratory showed that there were no significant differences in survival rate, nympha duration, and fecundity between laboratory populations of aphids fed on Bt and non-Bt cotton.

对Bt棉在长江中游棉区对各种主要靶标及非靶标害虫影响的系统评价表明，在长江中游棉区种植Bt棉，将有助于控制该地区的棉铃虫和红铃虫的危害，减少棉田农药的使用次数，控制棉蚜的暴发，使棉田生态系统朝良性的方向发展。

Armillary light source could provide light intensity from surrounding to center, and the intensity of light changed gradually.

固定数码相机拍摄设置，在同样光强度但投射方向不同下拍摄同一色标，比教色标上同样点的色度值，检测色度值是否发生变化及其规律。

Comparatively accurate colorimetric effect could be obtained when to use armillary light as light source and to ensure control group and test group were located in symmetrical location of the center.

不同方向的光会对数码色度值造成影响，使用环形灯作光源，并保证对照色标和被测色标处于画面中央对称位置则可以获得较为准确的比色效果。

The chromatic value were the same basically.Conclusion:The light of different direction would affect the chromatic value. Comparatively accurate colorimetric effect could be obtained when to use armillary light as light source and to ensure control group and test group were located in symmetrical location of the center.

不同方向的光会对数码色度值造成影响，使用环形灯作光源，并保证对照色标和被测色标处于画面中央对称位置则可以获得较为准确的比色效果。

The normal indoor target detection has following detects: simulated target motion curve is fixed, speed is nonadjustable, irection can not change at will.

与常规室内检测靶标相比，常规靶标存在着模拟目标运动轨迹固定、速度不可随时调节、方向不能任意改变等固有缺点。

The camera calibration method is based on the 2D plane target\'s camera calibration method that is proposed by Zhang Zheng-you et al. Intrinsic and extrinsic parameters of fixed-focus camera are obtained and the precision and the error analysis of Camera calibration are done. The multi-sensor vision system errors are obtained. The error average value is 3.39 mm in X lateral, 0.43 mm in Y lateral, and 1.52 mm in Z laterals. The precision might satisfy the multi-sensor vision system\'s localization request.(3) The goal position and intensity have difference between the visible light image and the near-infrared image because of their image formation mechanism, resolution and field of view differences.

2建立了基于2D圆控制点的摄像机标定试验系统，对多源传感器视觉系统的摄像机，采用张正友等人提出的基于2D平面靶标摄像机标定方法进行了标定试验，得到了多源传感器视觉系统的摄像机内外参数，并对标定结果进行了精度和误差分析，得出视觉系统在X方向误差均值为3.39 mm，Y方向误差均值为0.43 mm，Z方向误差均值为1.52 mm，可以满足多源传感器视觉系统的定位要求。

The hoop tension force is axisymmetrical about the tension direction and increase from the top position to both sides. The distribution of hoop tension force is even with small friction coefficient, but will increase rapidly from top to side positions, which subsequently result in necking and fracture near the edge of gauge section.

结果表明：采用正压力线性变化假设所得的切向力分布规律与拉伸实验结果吻合较好；切向力关于拉伸方向呈轴对称分布，从正上方到两侧逐渐增大；当摩擦系数较小时，切向力分布较均匀，但当摩擦系数较大时，切向力从正上方到两侧迅速增大，试样的颈缩和断裂发生在标距段内靠近标距边缘的位置。

Coefficient of expansion for any of the three dimensions at temperature T and constant pressure p given, in reciprocal kelvins, by the following wyuation.

在温度 T 和恒定压力 p 下，三个方向上任意一个方向上的膨胀系数单位为为绝对温标之倒数，即1/T ），由下式给出

In diagrams,such a direction is labeled either by arrows or subscripts in the symbols for voltages and is regarded to be the positive reference direction of a voltage.

In图，这个方向就是无论是箭头标记，或在电压的符号标和被认为是积极的参考方向一个电压。

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。