历史查询   



 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。 
Like the truncations of the Taylor expansion, the truncations of a chromatic expansion at t = t0 of an analytic function f(t) approximate f(t) locally, in a neighborhood of t0.


It is available for the case that the sign of f(x) changes frequently or the derivative f'(x) does not exist in the neighborhood of the root, while the Newton method is hard to work.


One allows the appearance of eight limit cycles in the neighborhood of infinity, which is the first example that a polynomial differential system bifurcates eight limit cycles at infinity.


Neighborhood union of independent sets and hamiltonicity of clawfree graphs


Let G be a graph, for any u∈V(G), let N(u) denote the neighborhood of u and d(u)=N(u) be the degree of u.

 更多 


 In this paper are collected the photographic features of 192 knots of 68 flares and some prominences in McMath 12094 region observed at Yunnan Observatory and Peking Observatory. From correlation analysis of the morphology of these flares and prominences with the fine structures of sunspot groups in this region, we verified the conclusions previously obtained in. 1.The earliest flare activity in this region appeared over the large preceeding spot A(N), which had higher energetic state of the twisted magnetic... In this paper are collected the photographic features of 192 knots of 68 flares and some prominences in McMath 12094 region observed at Yunnan Observatory and Peking Observatory. From correlation analysis of the morphology of these flares and prominences with the fine structures of sunspot groups in this region, we verified the conclusions previously obtained in. 1.The earliest flare activity in this region appeared over the large preceeding spot A(N), which had higher energetic state of the twisted magnetic field than all other spots of the group. It rapidly developed to the following spots (S polarity) and then shifted to the area outside the spots. This evolutive process was synchronous with the feature change and rotational movement of the whole sunspot group. 2.Flare activity near the large spot A started inside the magnetic tube of the twisted field, synchronous with the untwisting of spiral punumbral feature, the flare knots shifted from the neighborhood of the umbra to outside the penumbra. Flare activity subsided as a whole, when the spiral penumbral feature completely untwisted. 3.The large spiral spot A have been discovered as a strong attraction centre under the largest coronal prominence in the active region. This phenomena shows that the coronal prominence are built by powerful current contracting up in the corona. 4.The following possibility is discussed : the energy of twisted magnetic field of spot A provides for the energy of all flare activity in the region and leads to in stability.  本文收集了云南天文台和北京天文台观测的1972年10月太阳活动区(McMath 12094)的68个耀斑192个节点的照相资料和一些黑子日珥形态,对它们进行了相关分折,得到如下主要结果:1.本区最初的耀斑活动开始于全群诸黑子中具有扭结磁场最高能态的前导黑子A(N)的上空,它迅速发展到后随S极黑子上空,然后发展到黑子面积以外.这一演变过程与全群黑子的形态变化和旋转运动同步.2.A黑子附近的耀斑活动最初开始于扭结磁力管的内部,与扭结磁形态的松解过程同步,耀斑节点的分布由黑子本影附近移向半影的外面.当扭结完全松开,该处耀斑活动全面减少.3.发现了一个巨大的黑子冕珥下面的强烈的吸引中心是旋涡黑子,从而证实了冕珥是强大电流在日冕中收缩形成的.4.对于A黑子的扭转磁结构提供了本区耀斑活动的主要能量来源和导致不稳定性的问题进行了讨论.  In this paper, the variation of C_z~2, the dispersion of velocities in zaxis, with r is obtained by direct integration. We also obtain the variation of the radial dispersion of velocities with r through the stability of the density wave in threedimensional dishlike galaxies. In the solar neighborhood, the theoretical values of C_r and C_z are in fair agreement with the observed values. And toward the centre of the galaxies, the value of C_r/C_z approaches to 1.  本文通过直接积分求出星系对称面上的z方向速度弥散度随r的变化。同时,从三维盘状星系密度波的稳定性讨论推出了径向速度弥散度的变化规律。在太阳附近,理论计算的c_r与c_z值同观测基本符合。当r减小时,C_r/C_z减小;在星系中心,C_r/C_z近于1。  In this paper, the statistical analysis of space distribution for the sunspots active region of the 20th Solar cycles is introduced by the use of the method of autocorrelations analysis. Function of autocorrelations is found. Some interesting results were derived.The major results are the following:(1)In r=1 and r=2 to r=5,R(t) is low. It shows that when one bigger or big sunspot region appearing, in the neighborhood of bigger or big sunspots region 20?to 100, probability of sunspots region appearance... In this paper, the statistical analysis of space distribution for the sunspots active region of the 20th Solar cycles is introduced by the use of the method of autocorrelations analysis. Function of autocorrelations is found. Some interesting results were derived.The major results are the following:(1)In r=1 and r=2 to r=5,R(t) is low. It shows that when one bigger or big sunspot region appearing, in the neighborhood of bigger or big sunspots region 20?to 100, probability of sunspots region appearance is least.(2)From r=5 to r=7, R(r) is rise. In t=7, R(r) is one peak. From t=8 to t=17, R(r) is fall.(3)In T=18, R(r) is maximum. It shows that probability of one bigger or big .sunspot region rotation is bigger.(4)After first rotation, R(r) is low, in T=36, R(r) also is low. It shows that probability of sunspots region second rotation is least.  本文用自相关方法对廿周太阳黑子活动区作空间分布特征的统计分析.求出了自相关函数,由此得到了一些有意义的结果.   << 更多相关文摘 
相关查询  


