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排序方式: 共有216条查询结果,搜索用时 31 毫秒
21.
广西壮族自治区气象台 《大气科学》1977,1(4):316-320
广西地处祖国南疆,属低纬地区,山丘起伏,地形复杂,天气多变,每年都有不同程度的灾害,给发展农业生产带来不利的影响。在“农业学大寨”、“工业学大庆”的运动中,我们在自治区党委的领导下,进一步明确了气候为农业服务的方向,天气预报为灾害性天气和农事活动关键性天气为主攻方向,开展气象科研,大搞业务基本建设,对广西的主要灾 相似文献
22.
Xiang-Jun Lai Yan Li National Astronomical Observatories/ Yunnan Observatory Chinese Academy of Sciences Kunming China Key Laboratory for the Structure Evolution of Celestial Objects China Graduate University of Chinese Academy of Sciences Beijing China. 《中国天文和天体物理学报》2011,(10)
Based on the turbulent convection model (TCM) of Li & Yang, we have studied the characteristics of turbulent convection in the envelopes of 2 and 5M⊙ stars at the red giant branch and asymptotic giant branch phases. The TCM has been successfully applied over the entire convective envelopes, including the convective unstable zone and the overshooting regions. We find that the convective motions become progressively stronger when the stellar models are located farther up along the Hayashi line. In the convect... 相似文献
23.
Xi-Liang Zhang Zhong Liu National Astronomical Observatories/ Yunnan Observatory Joint Laboratory for Optical Astronomy Chinese Academy of Sciences Kunming China Graduate University of Chinese Academy of Sciences Beijing 《中国天文和天体物理学报》2011,(10)
Mutual events between natural satellites include mutual occultation and mutual eclipse. Mutual eclipse is another kind of mutual occultation as viewed from the center of the Sun instead of the Earth. Two mutual eclipses of J2 Europa by J1 Io (2009 Aug. 28 and Sept. 12) were observed at Yunnan Observatory during the PHEMU09 international campaign. We will calculate the astrometric data of these Galilean satellites by analyzing and fitting the light curves we obtained. The limb-darkening was considered during... 相似文献
24.
Yuan Ma De-Yu Wang Jun Lin Shuo Dai Xue-Fei Zhang National Astronomical Observatories of China / Yunnan Astronomical Observatory Chinese Academy of Sciences Kunming China Purple Mountain Observatory Nanjing China Harvard-Smithsonian Center for Astrophysics Cambridge MA USA 《中国天文和天体物理学报》2010,10(5)
We present a statistical study of decimetric type Ⅲ radio bursts,coronal mass ejections(CMEs),and Hα flares observed in the period from July 2000 to March2005.In total,we investigated 395 decimetric type Ⅲ radio burst events,21% of which showed apparent correlation to CMEs that were associated with Hα flares.We noticed that the Hα flares which were strongly associated with CMEs were gradual events,and82% of them took place before CMEs appeared in the field of view of LASCO C2;that most of the CME-associated radio bursts started in the frequency range around750 MHz with a frequency drifting rate of several hundred MHz s-1,of which both positive and negative ones were recognized; and that the correlation of type Ⅲ radio bursts to CMEs without associated flares is fairly vague,less than 9%. 相似文献
25.
Pei-Sheng Chen Xiao-Hong Yang Hong-Guang Shan National Astronomical Observatories /Yunnan Observatory Key Laboratory for the Structure Evolution of Celestial Objects Chinese Academy of Sciences Kunming China 《中国天文和天体物理学报》2010,10(4)
We collected almost all Highly Processed Data Products(HPDP)of ISO SWS01 spectra for the Galactic visual carbon stars,infrared carbon stars,extreme carbon stars and carbon-rich proto-planetary nebulae(PPNs).Those infrared spectra are primarily analyzed and discussed.It is shown that either spectral shapes/peaks,or main molecular/dust features are evidenced to change in the sequence of visual carbon stars,infrared carbon stars,extreme carbon stars and carbon-rich PPNs.Statistically,in this sequence,continua are gradually changed from blue to red and locations of spectral peaks of continua are also gradually changed from short wavelengths to long wavelengths.In addition,in this sequence,intensifies of main molecular/dust features are also gradually changed from prominent in the short wavelengths to prominent in the long wavelengths.Furthermore,from 2MASS and IRAS photometric data,the sequence is also proved.Results in this paper strongly support the previous suggestion for the evolution sequence of carbon-rich objects in our Galaxy,that is the sequence of visual carbon stars→infrared carbon stars→extreme carbon stars→carbon-rich PPNs. 相似文献
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27.
海底扩张的潮汐模式 总被引:3,自引:0,他引:3
杨学祥 《大地测量与地球动力学》2003,23(2):77-80
2000年6月底,东京以南的伊豆岛开始发生火山与地震活动。此后,在伊豆岛观测到异常的地壳变形,8月底,火山与地震活动达到高潮。对潮汐与火山和地震活动的关系进行了分析,认为:地壳变形是由伊豆岛的岩脉侵入引起的,并且与强潮汐天文条件相对应。根据观测和计算数据提出了海底扩张的潮汐模式。 相似文献
28.
扼要报导了国际大地测量学术界的一次重要会议-IAG2001年科学大会。根据会议的学术报告,对坐标系统的统一与协调,全球重力场研究,导航卫星的应用,地壳形变与地球动力学等方面的研究进展作了详细介绍。 相似文献
29.
给出红外点源IRAS 20231 3440附近恒星形成区近红外.JHK’和H2成像观测结果,以及与该IRAS点源成协的近红外点源IRS1的K波段分光观测结果..JHK’观测显示该区域存在嵌埋的年轻星天体,H2窄波段观测揭示了若干个氢分子发射结点,其中有几个结点排列成线形,暗示分子氢喷流的存在.喷流的北部与已知观测的分子外流成协,表明二者之间存在联系.喷流的走向提示IRS1可能是其激发源,对IRS1的K波段分光观测给出了进一步的证据.从近红外、MSX及IRAS资料估计出IRS1的能谱分布,表明它是一个处于ClassI状态的中等质量的年轻星天体. 相似文献
30.