重庆地面最低气温年极值的渐近分布及参数估计     

王增武  孟庆珍  扬瑞峰  郭晓雷 《成都信息工程学院学报》2004,19(3):442-446

利用重庆 1951-1996 年间 46 年地面气温年极小值的记录,采用韦伯分布和耿贝尔分布分别进行拟合试验.通过统计推断和对比,找出重庆地面最低气温年极值遵循的最佳渐近分布--韦伯分布.  相似文献   

The 2dF Galaxy Redshift Survey: correlation functions, peculiar velocities and the matter density of the Universe   总被引：1，自引：0，他引：1  

Ed Hawkins  Steve Maddox  Shaun Cole  Ofer Lahav  Darren S. Madgwick  Peder Norberg  John A. Peacock  Ivan K. Baldry  Carlton M. Baugh  Joss Bland-Hawthorn  Terry Bridges  Russell Cannon  Matthew Colless  Chris Collins  Warrick Couch  Gavin Dalton  Roberto De Propris  Simon P. Driver  George Efstathiou  Richard S. Ellis  Carlos S. Frenk  Karl Glazebrook  Carole Jackson  Bryn Jones  Ian Lewis  Stuart Lumsden  Will Percival  Bruce A. Peterson  Will Sutherland  Keith Taylor 《Monthly notices of the Royal Astronomical Society》2003,346(1):78-96

  相似文献   

疏散星团运动学资料汇集与若干统计分析     

陈力  侯金良  王家骥 《中国科学院上海天文台年刊》2003,(1)

整理汇集了迄今最完整的同时具备绝对自行与视向速度数据的 14 4个疏散星团样本 ,计算得出这些星团的 3维空间速度。对银河系疏散星团的空间分布 (采用了更多样本 )和运动学性质进行了若干统计分析  相似文献   

Morphology of the supercluster–void network in ΛCDM cosmology     

Sergei F. Shandarin  Jatush V. Sheth  Varun Sahni 《Monthly notices of the Royal Astronomical Society》2004,353(1):162-178

  相似文献   

On the alignment between binary spiral galaxies     

José Luis G. Pestaña  J. Cabrera 《Monthly notices of the Royal Astronomical Society》2004,353(4):1197-1200

  相似文献   

欧亚大陆晴天大气电场变化特征统计分析   总被引：2，自引：0，他引：2       下载免费PDF全文

张祎  张卫斌  王振会  李浩 《大气科学学报》2015,38(5):703-709

对欧亚大陆中纬度陆地9个晴天大气电场观测站点的观测数据进行了分析。结果表明:欧亚大陆中纬度陆地9个站点晴天大气电场强度的日变化主要成单峰单谷和双峰双谷两种波形。各站点的晴天大气电场强度季节变化也较为明显:冬季晴天大气电场强度值较大,夏季晴天大气电场强度值较小。晴天大气电场强度值的日变化总体上与大气电导率呈负相关,与爱根核浓度、绝对湿度呈正相关,并且温度梯度也对其有一定的影响。  相似文献   

A Statistical Study of the Relation between the Amplitude of Solar Cycle and the Area of Active Regions     

LI Peng  LE Gui-ming  CHEN Yu-lin  CHEN Min-hao  LU Yang-ping  YIN Zhi-qiang 《Chinese Astronomy and Astrophysics》2014

Based on the observational data of sunspots, the relation between the amplitude of solar cycle and the total area of all active regions occurred in a solar cycle has been investigated. The result shows that the amplitude of solar cycle has a good correlation with the total area of all active regions occurred in the solar cycle. The relation between the amplitude of solar cycle and the area of the largest active region during a solar cycle has also been investigated. The result shows that the amplitude of solar cycle has a poor correlation with the area of the largest active region during a solar cycle, and there is no fixed relation between the peak time of a solar cycle and the time when the largest active region occurred in the solar cycle.  相似文献   

Luminosity Function of The Galaxy Cluster Abell 85     

LI Feng  YAN Peng-fei  YUAN Qi-rong 《Chinese Astronomy and Astrophysics》2014

  相似文献   

A Statistical Study of the Mass Distribution of Neutron Stars     

CHENG Zheng  ZHANG Cheng-min  ZHAO Yong-heng  WANG De-hua  PAN Yuan-yue  LEI Ya-juan 《Chinese Astronomy and Astrophysics》2014

By reviewing the methods of mass measurements of neutron stars in four different kinds of systems, i.e., the high-mass X-ray binaries (HMXBs), low-mass X-ray binaries (LMXBs), double neutron star systems (DNSs) and neutron star-white dwarf (NS-WD) binary systems, we have collected the orbital parameters of 40 systems. By using the boot-strap method and the Monte-Carlo method, we have rebuilt the likelihood probability curves of the measured masses of 46 neutron stars. The statistical analysis of the simulation results shows that the masses of neutron stars in the X-ray neutron star systems and those in the radio pulsar systems exhibit different distributions. Besides, the Bayes statistics of these four different kind systems yields the most-probable probability density distributions of these four kind systems to be (1.340 ± 0.230)M8, (1, 505 ± 0.125)M8,(1.335 ± 0.055)M8 and (1.495 ± 0.225)M8, respectively. It is noteworthy that the masses of neutron stars in the HMXB and DNS systems are smaller than those in the other two kind systems by approximately 0.16M8. This result is consistent with the theoretical model of the pulsar to be accelerated to the millisecond order of magnitude via accretion of approximately 0.2M8. If the HMXBs and LMXBs are respectively taken to be the precursors of the BNS and NS-WD systems, then the influence of the accretion effect on the masses of neutron stars in the HMXB systems should be exceedingly small. Their mass distributions should be very close to the initial one during the formation of neutron stars. As for the LMXB and NS-WD systems, they should have already under- gone the process of suffcient accretion, hence there arises rather large deviation from the initial mass distribution.  相似文献   

The environmental dependence of different colors in the CMASS sample of the SDSS DR9     

Xin-Fa Deng 《天文和天体物理学研究(英文版)》2014,(5):553-564

I investigate the environmental dependence of galaxy colors in the CMASS sample of the Sloan Digital Sky Survey Data Release 9(SDSS DR9).To decrease the radial selection effect,I divide the CMASS sample into subsamples with a redshift binning size of?z=0.01 and analyze the environmental dependence of the u-r,u-g,g-r,r-i and i-z colors for these subsamples in each redshift bin.Statistical analysis shows that all five colors weakly correlate with the local environment,which may mean that the environmental processes responsible for a galaxy’s properties proceed slowly over cosmic time.  相似文献