نتایج جستجو برای: local rivers chemical characteristics and discharges

تعداد نتایج: 17013414  

2015
Maria Tzortziou Christina Zeri Elias Dimitriou Yan Ding Rudolf Jaffé Emmanouil Anagnostou Elli Pitta Angeliki Mentzafou

Most transboundary rivers and their wetlands are subject to considerable anthropogenic pressures associated with multiple and often conflicting uses. In the Eastern Mediterranean such systems are also particularly vulnerable to climate change, posing additional challenges for integrated water resources management. Comprehensive measurements of the optical signature of colored dissolved organic ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی - دانشکده ادبیات و زبانهای خارجی 1389

abstract tasks nowadays are at the center of attention in sla research. task types is one of the critical issues in this regard, their effectiveness and suitability to any particular context, their characteristics and the result they yield are among some of these issues. on the other hand, discourse markers (dms) have been very much investigated and their effectiveness in conveying the meaning...

2004
SYUKURO MANABE P. C. D. MILLY RICHARD WETHERALD

By use of a coupled ocean–atmosphere–land model, this study explores the changes of water availability, as measured by river discharge and soil moisture, that could occur by the middle of the 21st century in response to combined increases of greenhouse gases and sulphate aerosols based upon the “IS92a” scenario. In addition, it presents the simulated change in water availability that might be r...

Ahmad Fakheri Fard Farshad Ahmadi, Keivan KHalili Yagub Dinpashoh

One of the most important hydrological time series task is to determine if there is any trend in the data and how to achieve stationarity when there is nonstationarity behavior in data. Detecting trend and stationarity in hydrological time series may help us to understand the possible links between hydrological processes and global climate changes. In this study yearly, monthly and daily stream...

Journal: :Journal of Geographical Sciences 2023

Revealing the drivers and scale effects of water pollutant discharges is an important issue in study environmental consequences during urban agglomeration evolution. It also a prerequisite for realizing collaborative reduction governance agglomerations. This paper takes 305 counties Yangtze River Delta (YRD) as example selects chemical oxygen demand (COD) ammonia nitrogen (NH3—N) two distinctiv...

2002
William Roark

We have used a variety of approaches to introduce quantitative concepts into our introductory geology classes, some of which rely on using case studies of local rivers to improve student interest and appreciation of quantitative methods in scientific problem solving. Fortunately, there are rivers in most parts of the country, so these approaches are easily transferable and applicable in many ar...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه یاسوج - دانشکده علوم 1391

in this investigation the effect of external field on the electron density of nanostructures of cds, cdse, cdte, gaas and polymeric structure of three, four, five and six units of cds as a kind of nanosolar cells has been studied theoretically. as modeling this system in nanodimension, molecular structures has used. specific properties of molecular structures permit us to consider different sym...

Journal: :Environmental science & technology 2014
Helen M Amos Daniel J Jacob David Kocman Hannah M Horowitz Yanxu Zhang Stephanie Dutkiewicz Milena Horvat Elizabeth S Corbitt David P Krabbenhoft Elsie M Sunderland

Rivers are an important source of mercury (Hg) to marine ecosystems. Based on an analysis of compiled observations, we estimate global present-day Hg discharges from rivers to ocean margins are 27 ± 13 Mmol a(-1) (5500 ± 2700 Mg a(-1)), of which 28% reaches the open ocean and the rest is deposited to ocean margin sediments. Globally, the source of Hg to the open ocean from rivers amounts to 30%...

2014
Florian B. Neubauer Audrey Sederberg Jason N. MacLean

During the generalization of epileptic seizures, pathological activity in one brain area recruits distant brain structures into joint synchronous discharges. However, it remains unknown whether specific changes in local circuit activity are related to the aberrant recruitment of anatomically distant structures into epileptiform discharges. Further, it is not known whether aberrant areas recruit...

2011
A. Wagner G. Lohmann M. Prange

a r t i c l e i n f o The Arctic hydrological cycle throughout the Holocene is analyzed based on the results of transient simulations with the coupled atmosphere-ocean circulation model ECHO-G. The results suggest a ~ 2% increase of mid-Holocene to preindustrial Arctic river discharges for the Eurasian continent. However, rivers of the North America Arctic realm show a moderate runoff decline o...

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