Optimal water and fertilizer applications improve growth of Tamarix chinensis in a coal mine degraded area under arid conditions

2020 ◽  
Author(s):  
Rana Roy ◽  
Jinxin Wang ◽  
Mohammad Golam Mostofa ◽  
Dario Fornara
Keyword(s):  
Coal Mine ◽  
Tamarix Chinensis ◽  
Arid Conditions ◽  
Degraded Area

Characterizing the convective heat exchange with plastic shading nets under natural arid conditions

2019 ◽  
pp. 11-20
Author(s):  
Ahmed M Abdel-Ghanya ◽  
Ibrahim M Al-Helal
Keyword(s):  
Wind Speed ◽  
Thermal Radiation ◽  
Convective Heat ◽  
Convective Heat Transfer Coefficient ◽  
Convective Heat Exchange ◽  
Radiative Properties ◽  
Wooden Frame ◽  
Arid Conditions ◽  
Air Temperatures ◽  
Radiation Fluxes

Plastic nets are extensively used for shading purposes in arid regions such as in the Arabian Peninsula. Quantifying the convection exchange with shading net and understanding the mechanisms (free, mixed and forced) of convection are essential for analyzing energy exchange with shading nets. Unlike solar and thermal radiation, the convective energy, convective heat transfer coefficient and the nature of convection have never been theoretically estimated or experimentally measured for plastic nets under arid conditions. In this study, the convected heat exchanges with different plastic nets were quantified based on an energy balance applied to the nets under outdoor natural conditions. Therefore, each net was tacked onto a wooden frame, fixed horizontally at 1.5-m height over the floor. The downward and upward solar and thermal radiation fluxes were measured below and above each net on sunny days; also the wind speed over the net, and the net and air temperatures were measured, simultaneously. Nets with different porosities, colors and texture structures were used for the study. The short and long wave’s radiative properties of the nets were pre-determined in previous studies to be used. Re and Gr numbers were determined and used to characterize the convection mechanism over each net. The results showed that forced and mixed convection are the dominant modes existing over the nets during most of the day and night times. The nature of convection over nets depends mainly on the wind speed, net-air temperature difference and texture shape of the net rather than its color and its porosity.

Cebu Coal Mine Tragedies: Print Media Effects on Policy Legislation

2017 ◽  
Vol 2 (2) ◽  
pp. 83-91
Author(s):  
Nestor Godofredo Ramirez ◽  
◽  
Marjurie Lourince Zanoria ◽  
Andre Mikhail Obierez ◽  
◽  
...  
Keyword(s):  
Media Effects ◽  
Coal Mine ◽  
Print Media

Movement and Activity Patterns of Translocated Elk (Cervus elaphus Nelsoni) on an Active Coal Mine in Kentucky

2007 ◽  
Vol 3 (1) ◽  
Author(s):  
M. P. O. Olsson ◽  
J. Cox ◽  
J. Larkin ◽  
D. Maehr ◽  
P. Widén ◽  
...  
Keyword(s):  
Coal Mine ◽  
Cervus Elaphus ◽  
Activity Patterns ◽  
Cervus Elaphus Nelsoni ◽  
Active Coal
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