Browsing Research Units by Title
Now showing items 2970-2989 of 4858
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Numerical modeling and performance optimization of carbon-based hole transport layer free perovskite solar cells
( Elsevier , 2022 , Article)Owing to low production cost and ease of processing, hole-transport layer (HTL) free carbon electrode-based perovskite solar cells (c-PSCs) have emerged as a potential photovoltaic (PV) technology. Despite this, c-PCSs ... -
Numerical simulation analysis towards the effect of charge transport layers electrical properties on cesium based ternary cation perovskite solar cells performance
( Elsevier , 2021 , Article)In the present study, the device modeling of inverted architecture based on ITO/HTL/perovskite absorber/ETL/Ag was performed using a one-dimensional solar cell capacitance simulation (SCAPS-1D) program. Initially, device ... -
Numerical simulation of cascaded cyclone separator for nanosize aerosol
( Taylor and Francis Ltd. , 2021 , Article)Among the conventionally used sampling methods, the cyclone-based air samplers are considered to be the most effective and simplest method. However, the collection efficiency of these commercially available air samplers ... -
Numerical simulation of flow-through heat exchanger having helical flow passage using high order accurate solution dependent weighted least square based gradient calculations
( Bellwether Publishing, Ltd. , 2021 , Article)Improving the fluid flow and heat transfer characteristics of a heat exchanger has always been desired for any heat transferring application. Various active, passive, and combined methods were adopted for heat transfer ... -
Numerical simulation of the fracture and compression response of self-healing concrete containing engineered aggregates
( Elsevier , 2023 , Article)The existing self-healing concretes that rely on capsules require modifications to one or more traditional concrete mixing, placing, and consolidating methods. Additionally, concrete mixture designs need alterations to ... -
Numerical simulation to optimize the efficiency of HTM-free perovskite solar cells by ETM engineering
( Elsevier , 2023 , Article)Perovskite solar cells based on carbon electrodes (c-PSCs) without a hole transport material (HTM) have gained considerable interest owing to their cost-effective and simplified structure. However, their application is ... -
Nurses' Satisfaction and its Effect on Job Performance: Comparative Study between Joint Commission International Accredited and Non-accredited Palestinian Hospitals
( Qatar University Young Scientists Center - Qatar University , 2024 , Conference Paper)Background: Nurses' job satisfaction and performance have become more important in recent years as a metric for gauging the success of healthcare organizations in implementing their long-term strategy. Several factors ... -
Nutrient retention and release from raw exhausted grape marc biochars and an amended agricultural soil: Static and dynamic investigation
( Elsevier , 2020 , Article)Biochar is the solid by-product of biomass thermochemical conversion via pyrolysis technique. Biochar addition to croplands as an organic amendment can improve soil properties and increase agricultural productivity. However, ... -
Nutrients and energy digestibility of microalgal biomass for fish feed applications
( MDPI , 2021 , Article)Aquafeed accounts for at least 75-90% of aquaculture's operating costs. Traditional aquafeed ingredients such as fishmeal, fish oil, and soybean meal are unsustainable; further, their increasing cost necessities developing ... -
Nutritive effect of dust on microbial biodiversity and productivity of the Arabian Gulf
( Bellwether Publishing, Ltd. , 2020 , Article)The Arabian Gulf is exposed to intensive dust storms during summer until early winter. We investigated the nutritive effect of the dust on microbial biodiversity of the water column and the productivity of the Gulf. We ... -
Oblique and rotation double random forest
( Elsevier Ltd , 2022 , Article)Random Forest is an ensemble of decision trees based on the bagging and random subspace concepts. As suggested by Breiman, the strength of unstable learners and the diversity among them are the ensemble models’ core strength. ... -
Observations of hydrographic properties, dissolved oxygen (DO) and chlorophyll-A (Chl-a) (phytoplankton biomass) within the exclusive economic zone (EEZ) of Qatar (central Arabian Gulf)
( Hamad bin Khalifa University Press (HBKU Press) , 2015 , Conference Paper)In situ observations of physical, chemical, and biological parameters of the Qatari water column were conducted to understand the temporal (seasonal) and spatial (regional) variability in the vertical and horizontal ... -
Observed variability in physical and biogeochemical parameters in the central Arabian Gulf
( Elsevier , 2021 , Article)In situ measurements of physical and biogeochemical variables were conducted along a transect in the Exclusive Economic Zone (EEZ) of Qatar during late summer (September 2014) and winter (January 2015) to investigate their ... -
Occupational changes during the COVID-19 lockdown in Jordan
( Taylor and Francis , 2021 , Article)Background: Measures to limit the spread of COVID-19 have disrupted the lives of countless millions of individuals worldwide. Objective: To explore the experiences of occupational disruption and changing social roles among ... -
Occurrence, origin and potential ecological risk of dissolved polycyclic aromatic hydrocarbons and organochlorines in surface waters of the Gulf of Gabès (Tunisia, Southern Mediterranean Sea)
( Elsevier , 2022 , Article)We investigated the occurrence, origin, and potential ecological risk of dissolved polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyl (PCBs) and organochlorine pesticides (OCPs) in 27 surface water samples ... -
Ocean acidification impacts on zooplankton
( CRC Pressv , 2020 , Book chapter)[No abstract available] -
Octadecyltrichlorosilane-Modified Superhydrophobic-Superoleophilic Stainless Steel Mesh for Oil-Water Separation
( John Wiley and Sons Inc , 2021 , Article)Recently, oil-water separation has become an important topic due to its increasing commercial demand. Here, in this study, a simple technique to prepare superhydrophobic-superoleophilic mesh for oil-water separation is ... -
Oil for Food: The Global Food Crisis and the Middle East
( Cambridge University Press (CUP) , 2018 , Book Review)its hard-won gains from Raqqa to Mosul, victory for the United States and its allies in this clash of ideas and values in the deserts of the Middle East is far from assured” (319) -
Oil pollution in the Eastern Arabian Sea from invisible sources: A multi-technique approach
( Elsevier Ltd , 2019 , Article)The Eastern Arabian Sea (EAS) is affected by oil pollution, as often evidenced by the presence of tarballs along the West Coast of India (WCI). Tarball samples collected during May 2017 along the Goa coast were subject to ... -
Oil Spill Index (OSI) to Sentinel-2 satellite data: QU in International Contribution
( Qatar University Press , 2021 , Poster)An Oil Spill Index (OSI = (B3+B4)/B2) was developed and applied to Sentinel-2 optical satellite data of the European Space Agency (ESA) to map marine oil spills using spectral absorption characters of spectral bands of the ...