Results 101 to 110 of about 17,401 (230)

Mobility and removal of nitrate in heterogeneous Eocene aquifers [PDF]

open access: yes, 1998
n a study of the principles of lateral and vertical nitrate mobility and removal in unconfined heterogeneous fine sandy Eocene aquifers by long-term observation, no significant nitrate reduction could be observed over ...
Eppinger, Ralf, Walraevens, Kristine
core  

Groundwater circulation model in the extremely arid area of Heiyingshan, Ejina

open access: yesShuiwen dizhi gongcheng dizhi
The Heiyingshan region, located in Ejina, Inner Mongolia, is characterized by an extremely arid climate and predominantly saline groundwater. This acute water scarcity poses substantial challenges to regional socio-economic development and ecological ...
Gaoxin XIAO   +7 more
doaj   +1 more source

The distribution characteristics and its influencing factors of rare earth elements in the karst geothermal water in Pingdingshan Coalfield

open access: yes河南理工大学学报. 自然科学版
ObjectivesIn order to understand the indicative significance of the geochemical behavior of rare earth elements (REEs) in deep karst geothermal water of the coalfield in North China.MethodsTaking the Pingdingshan coalfield as an example, the distribution
LI Yanhe   +5 more
doaj   +1 more source

On the Specifics of Formation of the Qualitative Characteristics of Waters and Sediments in the Lena River Delta [PDF]

open access: yesУчёные записки Казанского университета: Серия Естественные науки, 2017
The paper considers the qualitative characteristics (chemical composition of waters and sediments, biological diversity) of the Lena runoff and their transformation as a result of the biogeochemical pro-cesses taking place in the delta region.
A.A. Chetverova   +5 more
doaj  

Analysis of water quality parameters in foothill rivers in the context of the construction of dam reservoirs

open access: yesFrontiers in Environmental Science
Backwater in retention reservoirs is potentially exposed to various contaminants, such as nutrients or heavy metals. Therefore, actions performed at the construction planning stage for such a facility are crucial; they are aimed at precisely evaluating ...
Maksymilian Połomski   +3 more
doaj   +1 more source

Overspeed correction scheme for dc motor using artifical intelligent approach [PDF]

open access: yes, 2013
The conventional PI, PD and PID controllers were used as a control strategy for various industrial processes from many years due to their simplicity in operation.
Bollah, Javadius
core  

Assessment of Groundwater Quality in the Semi-Arid Environment: Implications of Climate Change

open access: yesLimnological Review
The hydrogeochemical properties and evolution of groundwater in the Essaouira syncline basin in northwestern Morocco were investigated in this study, with a total of 447 samples during different campaigns (April 2017, May 2018, March 2019, and July 2020).
Otman El Mountassir   +4 more
doaj   +1 more source

Impact of recent climate variability on an aquifer system in north Belgium [PDF]

open access: yes, 2012
The last decade it has been realised that climate and global change can (and very likely will affect) groundwater reserves. This will have impact on both the economical (groundwater exploitation) and ecological (ecosystems) aspects of aquifer systems.
Martens, Kristine   +2 more
core  

Groundwater chemistry of the Lenjanat District, Esfahan Province, Iran [PDF]

open access: yes
Groundwater / Surface water / Water quality / Wells / River Basins / Iran / Esfahan Province / Lenjanat District / Zayandeh Rud Basin / Chadegan Dam / Zagros ...
Gieske, A.   +2 more
core  

Abiotic Typology of the Rivers and Lakes of the Ukrainian Section of the Western Bug River Basin and its Comparison with Results of Polish Investigations [PDF]

open access: yes, 2019
The completed investigation, which are based on the requirements of the EU WFD and rivers typology systems adapted in Ukraine and Poland, allowed us to identify: for the Western Bug river basin within Ukraine 9 abiotic river types, within Poland – 7.
Grebin, Vasyl V.   +2 more
core  

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