منابع مشابه
Evaluation of land degradation trend using satellite imagery and climatic data (Case study: Fars province)
Introduction: Climate change and human activities have a direct impact on land vegetation. Decreased rainfall and increased temperature are among the climate change factors leading to significant changes in water resources and energy balance in affected areas. On the other hand, human activities such as growing population, overgrazing and land use changes that make change in land conditions, al...
متن کاملCertifying Data from Multiple Sources
Data integrity can be problematic when integrating and organizing information from many sources. In this paper we describe efficient mechanisms that enable a group of data owners to contribute data sets to an untrusted third-party publisher, who then answers users’ queries. Each owner gets a proof from the publisher that his data is properly represented, and each user gets a proof that the answ...
متن کاملForecasting Stock Trend by Data Mining Algorithm
Stock trend forecasting is a one of the main factors in choosing the best investment, hence prediction and comparison of different firms’ stock trend is one method for improving investment process. Stockholders need information for forecasting firm’s stock trend in order to make decision about firms’ stock trading. In this study stock trend, forecasting performs by data mining algorithm. It sho...
متن کاملAu13-nAgn clusters: a remarkably simple trend.
The planar to three dimensional transition of Au13-nAgn clusters is investigated. To do so the low lying energy configurations for all possible concentrations (n values) are evaluated. Many thousands of possible conformations are examined. They are generated using the procedure developed by Rogan et al. in combination with the semi-empirical Gupta potential. A large fraction of these (the low l...
متن کاملContinental pleistocene climatic variations from speleothem age and isotopic data.
Speleothems from continental North American caves have been dated by means of the (230)Th/(234)U method. Oxygen isotopic variations in the dated samples and phases of speleothem deposition can be interpreted in terms of climatic change. A glacial chronology constructed from the age and isotopic data lends support to the astronomical theory of climatic change.
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ژورنال
عنوان ژورنال: Eos, Transactions American Geophysical Union
سال: 1999
ISSN: 0096-3941
DOI: 10.1029/99eo00165