Results 21 to 30 of about 359,568 (270)

Optimization Study For The Cross-Section Of A Concrete Gravity Dam: Genetic Algorithm Model And Application [PDF]

open access: yes, 2019
Concrete gravity dams have trapezoidal shape in their cross section and shall guarantee the global stability against acting loads like hydrostatic and uplift pressures through his gravitational actions (self-weight and others).
Araujo, Leilson Joaquim   +2 more
core   +3 more sources

Devising a mathematical model for displacement estimation of the wetting pattern center from the emitter location resulting from the soil surface slope

open access: yesTikrit Journal of Engineering Sciences, 2022
This research aims to study the effect of land surface slope on the shape and size of the wetting pattern in the soil resulting from a dripping source, especially when there is a local surface runoff resulting from a water application rate higher than ...
Mohammad Tariq Mahmood   +1 more
doaj   +1 more source

Chinese hydropower companies and environmental norms in countries of the global South: the involvement of Sinohydro in Ghana’s Bui Dam [PDF]

open access: yes, 2012
The paper examines the role of environmental norms in Chinese overseas investment in hydropower dams, exemplified by Sinohydro’s involvement in the Bui Dam in Ghana.
Hensengerth, Oliver
core   +1 more source

Effect of Intermittent Water Application from Trickle Source on The Water Movement and Moisture Distributionin Layered Soil

open access: yesTikrit Journal of Engineering Sciences, 2020
Efficient design of trickle irrigation system depends on the shape and volume of wetted soil, which are affected by many factors. Among these factors are water application rate, soil profile type, initial soil moisture, and continuous or intermittent ...
Haqqi Ismail Yasin   +1 more
doaj   +1 more source

A Flexible Particle Model for Rock Fracture: Validation and Assessment of the Influence of Deformability on the Macroscopic Response

open access: yesGeotechnics, 2022
Circular/spherical rigid particle models that were initially applied to rock fracture studies were not able to match the ratio of the compressive strength to tensile strength that occurs in rock.
Nuno Monteiro Azevedo   +2 more
doaj   +1 more source

Demonstration of early functional compromise of bone marrow derived hematopoietic progenitor cells during bovine neonatal pancytopenia through in vitro culture of bone marrow biopsies [PDF]

open access: yes, 2012
Background Bovine neonatal pancytopenia (BNP) is a syndrome characterised by thrombocytopenia associated with marked bone marrow destruction in calves, widely reported since 2007 in several European countries and since 2011 in New Zealand. The disease is
Ballingall, Keith T   +8 more
core   +2 more sources

Morphological Variations of A Certain Tigris River Reach For Different Periods in Iraq

open access: yesTikrit Journal of Engineering Sciences, 2007
A morphological variations occurs in the paths of rivers due to many reasons such as the hydraulic changes in the natural flow regime of rivers in-addition to the human activities on rivers such as dams constructions on rivers.
Thair Al-Taiee, Adil Al-Hamdani
doaj   +1 more source

Assessment of dam trapping efficiency from water residence time: Application to fluvial sediment transport in the Adour, Dordogne, and Garonne River basins (France) [PDF]

open access: yes, 2001
Dam-trapping efficiency can be estimated by using the hydraulic residence time. On the regional scale, the global impact of several dams can be assessed by taking into account the spatial organization of dams along the river network.
Brown   +36 more
core   +2 more sources

Hydro Engineering Feasibility Study of Surface Runoff Water Harvesting in Al-Ajeej Basin, North West Iraq

open access: yesTikrit Journal of Engineering Sciences, 2011
The hydro engineering characteristics of Al-Ajeej basin which was located within south Sinjar plain north west Iraq was analyzed to predict the possibility of surface runoff harvesting during rainfall season in the upstream sites in this basin using ...
Thair M. Al-Taiee, Anass M. M. Rasheed
doaj   +1 more source

Empirical Equations to Estimate Evapotranspiration in Mosul City

open access: yesTikrit Journal of Engineering Sciences, 2020
Average daily data of solar radiation, relative humidity, wind speed and air temperature from 1980 to 2008 are used to estimate the daily reference evapotranspiration in the Mosul City, North of Iraq.
Haqqi Ismail Yasin, Luma Fuaad Abdullah
doaj   +1 more source

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