【摘 要】
：
The time series of the monthly smoothed sunspot numbers in 1749-2000 is analyzed with the wavelet.The result shows that besides the known time-variation of the
【机 构】
：
National Astronomical Observatories,Department of Applied Mathematics
论文部分内容阅读
The time series of the monthly smoothed sunspot numbers in 1749-2000 is analyzed with the wavelet.The result shows that besides the known time-variation of the period about 11 years, other main periods of the sunspot numbers, such as the periods of about 100 years and so on,vary with time. We suggest that the time-variation of the main periods is the manifestation of the complex variation of sunspot numbers. It is significant to make a thorough study of the character and mechanism of the time-variation of the periods for proving prediction of sunspot numbers, especially for understanding the variation process of sunspot numbers.
其他文献
The biogenic silica analysis was performed on 463 samples from ODP 184 Site 1143, the southern South China Sea. The results show that the opal content and MAR e
分析了中国技术经济及管理学科在NSFC项目资助下所开展的科研合作行为在时空棱镜中的运动轨迹及规律,并着重考察了距离对科研合作的影响。在中国知网个人图书馆上检索2000-20
Typical rock samples with different lithologic characteristics were collected from exploring wells drilled in sandstone-conglomerate sedimental reservoirs with
(U-Th)/He ages of 13 samples from Yuexi-Luotian core and its flanks in Dabieshan orogen fall in the range of 155～85 Ma. He ages for samples from the core range b
In recent decades, environmental magnetism has become an important method for studying past global climatic and environmental changes. For an environmental magn
Carbon isotopes are measured for individual long-chain n-alkanes in sediments from the Nansha Sea. The features of carbon isotopic compositions of individual n-
Alkaline diagnesis is a diagenetic process that a reservoir undergoes under an alkaline environment. Because of the influence of alkaline formation water, the m
基于网络嵌入理论和动态能力理论,面对嵌入性悖论,以动态能力为中介变量,构建了多重网络嵌入影响集群企业知识创造绩效的概念模型,以福建省三大产业集群为对象,通过问卷调查
Layered cave passages formed on the walls of the Qianyou River valley in the middle part of the Qinling Mountains since the Pleistocene due to the intermittent
According to the boundary layer observations of three stations (Garze, Damxung and Qamdu) and relevant earth satellite, radiosonde and surface observations duri