Browsing Academic by Title
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Opportunistic routing and data dissemination protocol for energy harvesting wireless sensor networks
( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference Paper)Recent advances in environmental sources harvesting technologies is a promising solution to provide sustainable energy sources for wireless sensor networks (WSN). Renewable energy sources such as solar, thermal and ... -
Opportunistic screening for alcohol use problems in adolescents attending emergency departments: an evaluation of screening tools.
( Oxford University Press , 2018 , Article)To estimate and compare the optimal cut-off score of Alcohol Use Disorders Identification Test (AUDIT) and AUDIT-C in identifying at-risk alcohol consumption, heavy episodic alcohol use, ICD-10 alcohol abuse and alcohol ... -
Opportunistic spectrum sharing in relay-assisted cognitive systems with imperfect CSI
( IEEE , 2014 , Article)In this paper, we consider spectrum sharing between cognitive radio (CR) users and a licensed primary user (PU) to enhance the spectrum efficiency. In the considered scenario, the PU is not able to successfully transmit ... -
Opportunities and Challenges to the Implementation of Value-Based Healthcare (VBHC) in SMES: The Case of the State of Qatar
( Walter de Gruyter , 2023 , Article)The purpose of this paper is to identify the opportunities and barriers to the implementation of VBHC in SMEs in Qatar. A semi-structured survey was developed to investigate the perspectives of healthcare providers, from ... -
Opportunities and constraints of women entrepreneurs in Jordan: an update of the 5Ms framework
( Emerald Publishing , 2021 , Article)Purpose: Drawing on the “5Ms” gender cognizant framework, this study seeks to investigate how money, motherhood, management, the market and the macro/meso environment dimensions of the 5Ms may influence women's entrepreneurship ... -
Opportunities, challenges and trade-offs with decreasing avoidable food waste in the UK
( SAGE Publications , 2021 , Article)The Author(s) 2021. Around 6 million tonnes of edible food are being wasted (post-farm gate) in the UK each year. This fraction of edible wasted food is known as avoidable food waste. In a circular economy food is a valuable ... -
Opportunity analysis for enterprise collaboration between networks of SMEs
( CEUR-WS , 2015 , Conference Paper)The competitive environment within the corporate have forced the small and medium enterprises (SMEs) to be more dynamic in adapting new business strategies. To achieve this objective, SMEs resort to enterprise collaboration ... -
Opposing calcium-dependent signalling pathways control skeletal muscle differentiation by regulating a chromatin remodelling enzyme
( Nature Publishing Group , 2015 , Article)Calcium signalling is important for differentiation-dependent gene expression, but is also involved in other cellular functions. Therefore, mechanisms must exist to distinguish calcium signalling relevant to differentiation. ... -
Optical absorption enhancement in polymer BHJ thin film using Ag nanostructures: A simulation study
( Bentham Science Publishers , 2020 , Article)Background: The photo-absorption and light trapping through the different layers of the organic solar cell structures are a growing concern now-a-days as it affects dramatically the overall efficiency of the cells. In fact, ... -
Optical and electrical properties of a new polymer
( John Wiley & Sons, Inc. , 1997 , Article)Thin film of poly (5-isopropylidenecyclo-1,4-vinylene-2,3-dicarboxylicacidamide-s-methyl hydrazinecarbodithioate) (II) (Scheme 1) of 5 μm thickness was prepared. The dielectric properties of the prepared sample were studied ... -
The Optical and Electrical Properties of Low Density Polyethylene Films in CuSo4 Solution
( Qatar University , 2005 , Article)The optical and electrical properties of pure and treated low density polyethylene (LDpE) were investigated. These measurements have been carried out at various times of immersion for LDPE films in 10% solution of CuSO+. ... -
Optical and electrical properties of porous silicon impregnated with congo red dye
( American Institute of Physics , 2013 , Article)Incorporation of molecules into porous silicon (PS) matrix is of particular interest for potential utilization in hybrid organic-semiconductor devices. In this study, the incorporation of Congo Red molecules inside luminescent ... -
Optical biosensor based on ultrathin SOI waveguides
( Optica Publishing Group (formerly OSA) , 2020 , Conference Paper)We introduce an optical biosensor utilizing the MMI configuration and based on the ultrathin SOI platform. The biosensor was optimized using finite difference time domain simulations. A sensitivity of 420 nm/RIU was achieved. -
Optical character recognition on heterogeneous SoC for HD automatic number plate recognition system
( Springer International Publishing , 2018 , Article)Automatic number plate recognition (ANPR) systems are becoming vital for safety and security purposes. Typical ANPR systems are based on three stages: number plate localization (NPL), character segmentation (CS), and optical ... -
Optical characterization of tip bended Vertically Aligned Carbon Nanotubes array
( Elsevier B.V. , 2018 , Article)Vertically Aligned Carbon Nanotube arrays (also termed as VACNTs or CNT forest) have recently found to be transformable to a reflective mirror from a naturally black absorber. The feature of improved reflectance can be ... -
Optical fluorescent spider silk electrospun nanofibers with embedded cerium oxide nanoparticles
( SPIE , 2018 , Article)The work demonstrates an electrospun nanocomposite of recombinant spider silk protein (rSSp) nanofibers with embedded cerium oxide (ceria) nanoparticles. RSSP (MaSp1) has been produced, extracted from goat milk, and ... -
Optical investigation of a long throated Venturi conveying inert spherical particulate with size range similar to pulverised coal
( Elsevier B.V. , 2011 , Article)This experimental and numerical calculation work demonstrates the behaviour of a two-phase gas-solid Venturi. The type of two-phase flow studied is that encountered in conveying coal to the furnaces in power stations - a ... -
Optical Matching For Microwave Active Devices
( Qatar University , 1997 , Article)This paper describes a microstrip optically controlled matching technique between microwave active devices with low impedance (less than 10 ohms) and a conventional 50 or 70 ohm communication system in the upper microwave ... -
Optical mode division multiplexing for secure Ro-FSO WLANs
( American Scientific Publishers , 2015 , Article)The widespread deployment of various wireless radio access systems in public areas poses acute issues in frequency assignment. Radio-over-free-space-optics (Ro-FSO) technology enhances spectral efficiency and may pave the ... -
Optical mode division multiplexing for secure Ro-FSO WLANs
( American Scientific Publishers , 2015 , Article)The widespread deployment of various wireless radio access systems in public areas poses acute issues in frequency assignment. Radio-over-free-space-optics (Ro-FSO) technology enhances spectral efficiency and may pave the ...