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السجلات المعروضة 10181 -- 10190 من 10362
Novice teachers' job satisfaction and coping strategies: Overcoming contextual challenges at Qatari government schools
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Elsevier Ltd
, 2017 , Article)
The first years of teaching are challenging and how novice teachers cope has important implications for their satisfaction. The current study examined the perceptions of five novice and five experienced teachers about ...
A review on recent trends in reactor systems and azeotrope separation strategies for catalytic conversion of biodiesel-derived glycerol
(
Elsevier B.V.
, 2019 , Article Review)
The increasing demand for biodiesel (BD) as a renewable and sustainable energy source has impelled the generation of abundant and low-cost byproduct glycerol, which accounts for 10 wt% of total BD production and requires ...
Transition metal doped ceria for solar thermochemical fuel production
(
Elsevier Ltd
, 2018 , Article)
In this paper, the effect of doping of transition metal cations on thermal reduction and CO2 splitting ability of Ce0.9M0.1O2−δ materials (where, M = Ni, Zn, Mn, Fe, Cu, Cr, Co, Zr) is investigated by performing multiple ...
Mathematical modeling, simulation and optimization of solar thermal powered Encontech engine for desalination
(
Elsevier Ltd
, 2018 , Article)
This paper investigates a solar driven external combustion and regenerative engine, which can be used for desalination of seawater by using gaseous working fluids. The effect of operating and design parameters on engine ...
Single and multi-component adsorption of aromatic acids using an eco-friendly polyaniline-based biocomposite
(
Elsevier B.V.
, 2017 , Article)
The polyaniline coated with an agricultural waste (Argan nut shell) was prepared via in-situ chemical polymerization and used as an adsorbent material for removal of trimellitic (Tri), hemimellitic (Hemi) and pyromellitic ...
Bio-carrier and operating temperature effect on ammonia removal from secondary wastewater effluents using moving bed biofilm reactor (MBBR)
(
Elsevier B.V.
, 2019 , Article)
This study investigates the impact of bio-carriers' surface area and shape, wastewater chemistry and operating temperature on ammonia removal from real wastewater effluents using Moving bed biofilm reactors (MBBRs) operated ...
Novel controlled synthesis of nanoporous carbon nanorods from resorcinol-formaldehyde xerogels
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Elsevier B.V.
, 2017 , Article)
A novel approach is discovered to produce carbon nanorods (CNRs) from resorcinol-formaldehyde xerogels. The structure and morphology of CNRs are characterized by pore size analysis, nano-scanning electron microscopy, ...
Aging evaluation of asphalt samples with Low Field Nuclear Magnetic Resonance
(
Elsevier Inc.
, 2017 , Article)
In this study, a recently developed methodology to assess aging of pavements by using Low Field Nuclear Magnetic Resonance (LF-NMR) was applied to asphalt mix samples at different aging states. The ultimate objective of ...
Characteristics and mitigation strategies for cell phone use while driving among young drivers in Qatar
(
Elsevier Ltd
, 2018 , Article)
There is no doubt that cell phone use while driving can lead to a higher probability of driver error, which increases the likelihood of more crashes. In Qatar, the high rate of cell phone use while driving among young ...
Insulator-based dielectrophoresis for fouling suppression in submerged membranes bioreactors: Impact of insulators shape and dimensions
(
Elsevier B.V.
, 2019 , Article)
The application of insulator-based dielectrophoresis (iDEP) has the potential to enhance membrane fouling suppression in submerged membrane bioreactors without extra energy consumption. In this study, the effect of the ...