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ray center
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     For a given finite planar point set and angle a, satisfying 0ray center x and ray angle no less than a such that no other pointsexists in the infiiite domain with the two rays as its boundaries.
     对一给定有限平面点集S与一个实数a满足0<a<2π,S的最大于集又满足对任x∈Sa,存在一个以上为中心且夹角不小于a的两条射线使得由两条射线为边界的无界区域内不存在S中的点,称Sa为S的a角控集。
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  相似匹配句对
     The Effective Center of Ionization Chamber in Measurement of X-Ray Dosage
     在X射线剂量测量中的电离室有效中心
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     chest X ray.
     X线影像。
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     X-ray spectrometry;
     X射线分析;
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     Study of fixing wrist X-ray photography center in KBD areas
     大骨节病区儿童手腕骨X线摄影中心定位的研究
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     Harbor Center
     港湾中心
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  ray center
The Chandra X-ray Center is committed to assisting astronomers from any country who wish to use data from the archive or propose for observations.
      
In the isolation cells of the ray center we found 39 plasmodesmata per μm2 of pit field, 8.0 per μm2 of tangential wall, and 1.98% of the wall occupied by plasmodesmata.
      
This implies that ejecta fragment masses may approach an order of magnitude larger along a ray center than elsewhere, for a given ejection speed.
      


For a given finite planar point set and angle a, satisfying 0ray center x and ray angle no less than a such that no other pointsexists in the infiiite domain with the two rays as its boundaries. In this paper,some geomet-rical properties of Sa and algorithms for finding Sa are given。

对一给定有限平面点集S与一个实数a满足0<a<2π,S的最大于集又满足对任x∈Sa,存在一个以上为中心且夹角不小于a的两条射线使得由两条射线为边界的无界区域内不存在S中的点,称Sa为S的a角控集。文中首先给出了Sa的几个基本几何性质,同时给出了计算Sa的算法。

The X-ray synchrotron spectra of the Crab Nebula at arc-second scale were measured from observations with the Chandra X-ray Observatory. In addition to the Crab Nebula as a whole, we measured the spectra of the torus, the knots, the wisp, the jet (southeast) and its counter-jet (northwest). We obtained the radial distribution of the photon index of the torus. We find evidence for an acceleration region between the Crab pulsar and the X-ray inner ring that has not been anticipated by previous...

The X-ray synchrotron spectra of the Crab Nebula at arc-second scale were measured from observations with the Chandra X-ray Observatory. In addition to the Crab Nebula as a whole, we measured the spectra of the torus, the knots, the wisp, the jet (southeast) and its counter-jet (northwest). We obtained the radial distribution of the photon index of the torus. We find evidence for an acceleration region between the Crab pulsar and the X-ray inner ring that has not been anticipated by previous observations and theories. The knots have the lowest spectral index, which indicates that they are the sites of particle acceleration. The photon index of the main (southeast) jet is similar to that in the faintest area of the torus. The northwest counter-jet has the greatest photon index in the Crab Nebula. The variations of the photon index are obvious along the radial distribution of the torus and the ejecting direction of the jet (southeast). We compared our results with those of XMM(X-Ray Multi-Mirror Mission) and find that the main data match quite well. The data we used, released by the CXC (Chandra X-ray Center), is OID (observe ID) 2000, taken on April 6, 2001. Its observation time is 27.292 ks imaged on the ACIS (Advanced Camera for Imaging and Spectroscopy) -7 CCD chip. We analyzed these data with the CIAO (Chandra Interactive Analysis of Observations) version 2.3 analysis package, the CALDB version 2.21 calibration database, the ACISSPEC spectrum-extracting tool, and the Sherpa spectrum-fitting program. In every selected area of the Crab Nebula, we fit the 0.4 - 5 keV spectrum with a single power-law continuum with interstellar absorption. The smallest area we measured is larger than Chandra's PSF (Point Spread Function) with 0.5 arc-second.

首次用Chandra卫星资料详尽的对蟹状星云弧秒尺度区域以及主要的活动区进行了X射线谱分析 .测得了蟹状星云中的主要活动区 :如环面 (torus) ,结节 (knots) ,亮条纹 (wisp) ,喷流 (东南方向 ) ,反向喷流 (西北方向 )的光子谱指数 (photonindex) .同时在环面区 ,分析了光子谱指数随径向的分布 .有迹象表明 ,在内环中可能存在一个在理论和观测上以前都没有提及到的粒子加速区 .结节是整个蟹状星云中光子谱指数最低的地方 ,这表明粒子在这些区域得到加速 .东南方向的喷流的谱指数和环面内暗区的谱指数类似 ,而西北方向的反向喷流具有最大的光子谱指数 .得到的结果同XMM (X_RayMulti_MirrorMission)卫星的结果进行比较 ,两者基本一致 .

 
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