查询词典 sphere

It is a machine to transmit the charge from a point to a moving line, then get the charge at another point on a sphere conduct.

范得克拉夫起电机（ Van de graff generator：将电荷从一点转移到一条移动的带上，接着被另一点收集附着在一个球型导体上的机器。

Department of Energy's Lawrence Livermore National Laboratory, comprises 192 lasers that fire simultaneously at precisely the same point in space: a sphere of fuel two millimeters in diameter.

设在美国能源部Lawrence Livermore国家实验室的国家点火装置，装有192个能够同时向空间同一位置发射的激光器：这个空间是一个直径两毫米的燃料球体。

As we all know,there is one Simson line at any point on the circumference of triangles,but in this paper, LHP theorem shows that the above conclusion is not correct for any quadrilateral pyramid in three-dimensional space and also during proving LHP theorem,fixed value theorem is proved,at the same time,one guess about the point H and point P on circumscribed sphere of tetrahedron has been concluded.

众所周知，三角形的外接圆周上任一点存在一条 simson 线，而 LHP 定理则指出对于正四面体该结论是不能推广到三维空间上的，并且在论证 LHP 定理的过程中得出了定值定理，同时作为一般四面体的外接球球面上的 H 点、P 点的分布，给出了一个猜想。

Astronomy A point on the celestial sphere directly below the observer, diametrically opposite the zenith.

天底：天球上，在观测者垂直向下的一点，与天顶完全相对

This study utilized 3-D cinematography analysis and connected with the mathematical principle of perpendicular bisecting plane, and with displacement changes of any two markers that mark the point on the surface of sphere to develop a kind of method to effectively and actually measure the spin rate and the axis of free rotational ball in the sky.

本研究利用3D摄影分析配合垂直平分面数学原理，藉由球体表面上任意两标志点的位移变化，发展出一种有效实际量测出空中自由旋转球体转速与转轴的方法，可提供空气动力学相关研究时旋转测量的重要依据。

The results show that a separate dunk is observed near the stagnation point of the second sphere on the distance of spheres L≤2.5D because of the influence of reverse pressure gradient.

结果表明：当L≤2.5D时，由于逆压梯度的影响，在第二个圆球滞止点附近捕捉到附体分离泡；由于第二个与第三个圆球的置入，展向压力梯度诱发第一个圆球背风面流动的展向输运，且随着圆球间距的增加流场的展向输运趋势减小，但涡的强度增大；第二个圆球与第三个圆球背风面流动没有明显的展向输运；湍动能的增量与圆球间距近似成平方规律。

The point cloud was divided twice and distributed to 3D cell grids, then ultimate space, internal space, external space were decided for each grid. With the help of each point s sphere space, K-nearest neighbors of the point can be found quickly.

首先，采用二次划分的方法将点云划分到相应的立方体小栅格中；然后，为采样点所在的立方体小栅格确定最终子空间、内子空间和外子空间，结合采样点的球空间，就能很快确定该采样点的K邻域的搜索范围。

The main results are:(1) the L1 boundedness of the Cesaro means operator of the harmonic expansions on the unit sphere with reflection-invariant measures is proved, and the characterization of the convergence index is given; for the points not in the planes with singularities, the pointwise convergence is also proved; these results are the generalizations of those both for the classical spherical harmonic expansions and for the Jacobi expansions;(2) Using the differential-reflection operators of Dunkl type, the uncertainty principle of a class of Sturm-Liouville operators is established, and as consequences, the uncertainty principles of some well-known classical orthogonal expansions such as Jacobi, Hermite and Laguerre expansions are obtained;(3) by introducing the Cauchy-Riemann equations in terms of the differential-reflection operators of two variables, the harmonic analysis of the extended Jacobi expansions is studied; the results include the Lp boundedness and the weak-L1 boundedness of the conjugate extended Jacobi expansions; specially, for some indexes p smaller than 1, the basic theory of the related Hardy spaces is established.

主要成果有：（1）证明了带有反射不变测度的球面调和展开蔡沙罗平均算子的L1有界性，给出了收敛指标的特征刻划，对不在奇性平面上的点，还证明了点态收敛性，这些成果同时推广了经典球面调和展开和雅可比展开的结果；（2）利用Dunkl型的微分-反射算子建立了一类斯特姆-刘威尔算子的测不准原理，并由此得到一些著名的经典正交展开如雅克比展开、赫米特展开和拉盖尔展开的测不准原理；（3）利用由两个变量的微分-反射算子定义的柯西-黎曼方程组来研究扩展雅克比展开的调和分析，证明了共轭扩展雅克比展开的Lp有界性和弱L1有界性，特别是对小于1的一些指标p，建立了相应的哈代空间的基本理论。

Numerical results of this method show good agreement with the analytical solutions of the polarizability of conducting or dielectric sphere and torus.

在导体和电介质的球与导体和电介质的环中，这个方法所求得的数值之结果与解析的解呈现高度的一致性。

Cut along the grooved out edge of the fork,remove from pom-pom maker,Tease the pom pom out and tidy up any stray ends to form a smooth uniform sphere.

把缠好的边缘部分如图剪开，并把缠好的丝带从 POM-POM MAKER 拿出来，梳理下球，一个漂亮的毛毛球就做成功了。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。