期刊文献+
共找到7篇文章
< 1 >
每页显示 20 50 100
Power Law Distributions in the Experiment for Adjustment of the Ion Source of the NBI System
1
作者 韩筱璞 胡纯栋 《Plasma Science and Technology》 SCIE EI CAS CSCD 2005年第6期3102-3104,共3页
The experiential adjustment process in an experiment on the ion source of the neutral beam injector system for the HT-7 Tokamak is reported in this paper. With regard to the data obtained in the same condition, in arr... The experiential adjustment process in an experiment on the ion source of the neutral beam injector system for the HT-7 Tokamak is reported in this paper. With regard to the data obtained in the same condition, in arranging the arc current intensities of every shot with a decay rank, the distributions of the arc current intensity correspond to the power laws, and the distribution obtained in the condition with the cryo-pump corresponds to the double Pareto distribution. Using the similar study method, the distributions of the arc duration are close to the power laws too. These power law distributions are formed rather naturally instead of being the results of purposeful seeking. 展开更多
关键词 power law distribution adjustment experiment ion source double Pareto distribution
下载PDF
A Theoretical Explanation of the Causes of Popular Elements and Income Power Law Distribution Based on Data Analysis
2
作者 DONG Chun 《Psychology Research》 2022年第6期362-368,共7页
The known statistical data show that the distribution of popular elements and people’s income presents the characteristics of power law distribution.At present,the explanation for this phenomenon is mostly through th... The known statistical data show that the distribution of popular elements and people’s income presents the characteristics of power law distribution.At present,the explanation for this phenomenon is mostly through the“rich get richer”theory,but the author believes that this theory has major flaws and fails to provide a reasonable explanation for many phenomena.Therefore,the author expands some empirical and recognized theories in a similar direction in logic,and derives a logical mathematical model through the derivation of mathematical formulas,so as to explain the phenomenon that the distribution of popular elements and people’s income presents a power-law distribution.Then,by analyzing various characteristics of social networks and comparing them with some phenomena in nature,the conclusion can be extended to all self-organizing groups in nature. 展开更多
关键词 social network POPULARITY INCOME power law distribution
下载PDF
Power Law for the Rates of Different Numbers of Chronic Diseases among Elderly Chinese People
3
作者 Handong Li Ping Gao 《Open Journal of Statistics》 2016年第6期1155-1165,共12页
Chronic disease is an important factor that affect the health of elderly people. We analyzed the 2006 and 2010 data from the Chinese Urban and Rural Elderly Population Surveys, which are nationally representative surv... Chronic disease is an important factor that affect the health of elderly people. We analyzed the 2006 and 2010 data from the Chinese Urban and Rural Elderly Population Surveys, which are nationally representative surveys of elderly people aged 60 years and above. We found that there existed a typical power-law distribution for the rates of different numbers of chronic diseases among elderly Chinese people. A Kolmogorov-Smirnov test indicated that the result was robust, and the power exponents were approximately ?2.5. In addition, a paired t-test was conducted, which demonstrated that the rates of different numbers of chronic diseases did not have significant urban-rural differences, time differences or gender differences. 展开更多
关键词 Chronic Disease power law distribution Elderly People Kolmogorov-Smirnov Test (K-S Test) Paired T-Test
下载PDF
Size Distribution of Submarine Landslides Along the Middle Continental Slope of the East China Sea
4
作者 HU Guanghai YAN Tong +2 位作者 LIU Zhenxia Maarten Vanneste DONG Lifeng 《Journal of Ocean University of China》 SCIE CAS 2009年第4期322-326,共5页
This paper investigates the size distribution of submarine landslides on the middle continental slope of the East China Sea (ECS) using the size of the landslide source regions. Geomorphometric mapping is used to iden... This paper investigates the size distribution of submarine landslides on the middle continental slope of the East China Sea (ECS) using the size of the landslide source regions. Geomorphometric mapping is used to identify 102 mass movements from multibeam bathymetric data and to extract morphological information about the head scarps and side walls. These mass movements have areas ranging between 0.06 km2 and 15.51 km2 and volumes between 0.002 km3 and 2 km3. The area vs volume relationship of these failure scarps is approximately linear, suggesting a fairly uniform failure thickness in each event with scarce deep excavating landslides. The cumulative area distribution of the slope failures can be described by an inverse power law. The submarine landslides on the mid-ECS continental slope could be considered as a large-scale self-organizing system because they have the characteristics of a dissipative system in a critical state. 展开更多
关键词 MULTIBEAM power law distribution submarine geomorphology self-organizing criticality East China Sea
下载PDF
Evolution of two properties for scale-free network 被引量:1
5
作者 Li Shouwei Qian Xingsan 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2006年第3期535-540,共6页
Fitness of node can denote its competing power and clustering denotes the transitivity of network. Because the fitness of node is uncertain or fuzzy in some social networks, an explicit form of the degree distribution... Fitness of node can denote its competing power and clustering denotes the transitivity of network. Because the fitness of node is uncertain or fuzzy in some social networks, an explicit form of the degree distribution on fuzzy fitness is derived within a mean field approach. It is a weighted sum of different fuzzy fitness. It can be found that the fuzzy fitness of nodes may lead to multiscaling. Moreover, the clustering coefficient of node decays as power law and clustering coefficient of network behavior not-decrease-but-increase’ phenomenon after some time. Some computer simulation results of these models illustrate these analytical results. 展开更多
关键词 fuzzy fitness clustering coefficient power law distribution scale-free.
下载PDF
Approach in High Precision Topic-Specific Resource Discovery on the Web
6
作者 YeWei-guo LuZheng-ding 《Wuhan University Journal of Natural Sciences》 EI CAS 2004年第1期41-45,共5页
The Internet presents numerous sources of useful information nowadays. However, these resources are drowning under the dynamic Web, so accurate finding user-specific information is very difficult. In this paper we dis... The Internet presents numerous sources of useful information nowadays. However, these resources are drowning under the dynamic Web, so accurate finding user-specific information is very difficult. In this paper we discuss a Semantic Graph Web Search (SGWS) algorithm in topic-specific resource discovery on the Web. This method combines the use of hyperlinks, characteristics of Web graph and semantic term weights. We implement the algorithm to find Chinese medical information from the Internet. Our study showed that it has better precision than traditional IR (Information Retrieval) methods and traditional search engines. Key words HITS - evolution web graph - power law distribution - context analysis CLC number TP 391 - TP 393 Foundation item: Supported by the National High-Performance Computation Fund (00303)Biography: Ye Wei-guo (1970-), male, Ph. D candidate, research direction: Web information mining, network security, artificial intelligence. 展开更多
关键词 HITS evolution web graph power law distribution context analysis
下载PDF
SIGNATURES OF UNIVERSAL CHARACTERISTICS OF FRACTAL FLUCTUATIONS IN GLOBAL MEAN MONTHLY TEMPERATURE ANOMALIES 被引量:1
7
作者 A. M. SELVAM 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2011年第1期14-38,共25页
This paper proposes a general systems theory for fractals visualising the emergence of successively larger scale fluctuations resulting from the space-time integration of enclosed smaller scale fluctuations. Global gr... This paper proposes a general systems theory for fractals visualising the emergence of successively larger scale fluctuations resulting from the space-time integration of enclosed smaller scale fluctuations. Global gridded time series data sets of monthly mean temperatures for the period 1880- 2007/2008 are analysed to show that data sets and corresponding power spectra exhibit distributions close to the model predicted inverse power law distribution. The model predicted and observed universal spectrum for interannual variability rules out linear secular trends in global monthly mean temperatures. Global warming results in intensification of fluctuations of all scales and manifested immediately in high frequency fluctuations. 展开更多
关键词 Fractals and statistical normal distribution golden mean and fractal fluctuations long- range correlations and fat tail distributions power law distributions.
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部