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السجلات المعروضة 17280 -- 17299 من 26317
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PVA/chitosan/silver nanoparticles electrospun nanocomposites: Molecular relaxations investigated by modern broadband dielectric spectroscopy
( MDPI AG , 2018 , Article)In this study, we used broadband dielectric spectroscopy to analyze polymer nanofibers of poly(vinyl alcohol)/chitosan/silver nanoparticles. We also studied the effect of incorporating silver nanoparticles in the polymeric ... -
PWM scheme for dual matrix converters based five-phase open-end winding drive
( IEEE , 2013 , Conference Paper)The paper present simple carrier-based pulse width modulation scheme for three to five-phase matrix converters feeding a five-phase machine from both ends. The two matrix converters feeding a five-phase induction machine ... -
PyGOP: A Python library for Generalized Operational Perceptron algorithms
( Elsevier B.V. , 2019 , Article)PyGOP provides a reference implementation of existing algorithms using Generalized Operational Perceptron (GOP), a recently proposed artificial neuron model. The implementation adopts a user-friendly interface while allowing ... -
Pyocin QDD1: A highly thermostable bacteriocin produced by Pseudomonas aeruginosa QDD1 for the biocontrol of foodborne pathogens Staphylococcus aureus and Bacillus cereus
( Elsevier Ltd , 2022 , Article)This study was designed to explore alternative antibacterial bioresource products, bacteriocins produced by local strain of Pseudomonas aeruginosa QDD1. This bacteriocin (termed as Pyocin) has high inhibitory activity ... -
Pyocyanin pigment from Pseudomonas aeruginosa modulates innate immune defenses in macrophages
( Qatar University Press , 2021 , Poster)Background: Pseudomonas aeruginosa is a well-known opportunistic pathogen. The gram-negative bacillus, commonly associated with hospital-acquired infections, utilizes the host's impaired immune responses to establish ... -
A Pyramidal Security Model for Large-Scale Group-Oriented Computing in Mobile Ad Hoc Networks: The Key Management Study
( IEEE , 2009 , Article)In mobile ad hoc networks (MANETs), many applications require group-oriented computing among a large number of nodes in an adversarial environment. To deploy these large-scale cooperative applications, secure multicast ... -
Pyridoxine non-responsive p.R336C mutation alters the molecular properties of cystathionine beta-synthase leading to severe homocystinuria phenotype
( Elsevier , 2022 , Article)The prevalence of homocystinuria in Qatar is 1:1800, mainly due to a founder missense mutation p.R336C. • The cystathionine beta-synthase (CBS) R336C mutant was bacterially expressed, purified and its molecular properties ... -
Pyrite (FeS2)-supported ultrafiltration system for removal of mercury (II) from water
( Springer , 2021 , Article)This study investigated the Hg(II) removal efficiencies of the reactive adsorbent membrane (RAM) hybrid filtration process, a removal process that produces stable final residuals. The reaction mechanism between Hg(II) and ... -
Pyrite Scale Removal Using Green Formulations for Oil and Gas Applications: Reaction Kinetics
( American Chemical Society , 2019 , Article)Pyrite is one of the toughest iron sulfide scales to remove, which causes major problems in oil and gas production by damaging production equipment. The use of inorganic acid in iron sulfide scale removal particularly ... -
Pyrite-scale removal using glutamic diacetic acid: A theoretical and experimental investigation
( Society of Petroleum Engineers (SPE) , 2021 , Article)Iron sulfide scale causes major losses in both upstream and downstream sectors of the hydrocarbon industry. Pyrite is one of the most-difficult forms of iron sulfide scale from a removal point of view. Inorganic acids such ... -
Pyrolysis Kinetics of Oil-Palm Solid Waste
( Qatar University , 2005 , Article)Pyrolysis of oil-palm shells, a cheap and abundantly available solid waste from palm oil producing process, was carried out using thermogravimetric analysis. The effect of heating rates (10,15,20 and 25°C/min) on the kinetic ... -
Pyrolysis of Canarium schweinfurthii hard-shell: Thermochemical characterisation and pyrolytic kinetics studies
( Elsevier , 2023 , Article)Canarium schweinfurthii fruit used in food and cosmetics produces waste nuts with a hard shell (hard-shell) and kernel. The hard-shell contained lignin and holocellulose, besides 51.99 wt% carbon, 6.0 wt% hydrogen, 41.68 wt% ... -
Pyrolysis Process as a Sustainable Management Option of Poultry Manure: Characterization of the Derived Biochars and Assessment of their Nutrient Release Capacities
( MDPI , 2019 , Article)Raw poultry manure (RPM) and its derived biochars at temperatures of 400 (B400) and 600 ◦C (B600) were physico-chemically characterized, and their ability to release nutrients was assessed under static conditions. The ... -
Pyrolytic elimination of ethylene from ethoxyquinolines and ethoxyisoquinolines: a computational study
( Nature Research , 2023 , Article)This work reports a thermo-kinetic study on unimolecular thermal decomposition of some ethoxyquinolines and ethoxyisoquinolines derivatives (1-ethoxyisoquinoline (1-EisoQ), 2-ethoxyquinoline (2-EQ), 3-ethoxyquinoline (3-EQ), ... -
Pyrrolizidine alkaloids from alkanna orientalis (L.) Boiss
( Qatar University , 1992 , Article)Three pyrrolizidine alkaloids; 7-angelyl retronecine (I), 9-angelyl retronescine (II), and dihydroxytriangularine (III) were isolated by DCCC and VLC from Alkanna orientalis growing in Egypt. Their structures were elucidated ... -
Pyrrolizidine alkaloids from heliotropium arbainense and h. Ovalifolium
( Qatar University , 1991 , Article)Investigation of the pyrrolizidine alkaloids of Heliotropium arbainense resulted in the isolation and identification of heliotrine, europine and 7-angelylheliotrine. From H. ovalifolium three alkaloids were isolated: ... -
Pyrrolizidine Alkaloids From Senecio Aegyptius L.
( Qatar University , 1988 , Article)Investigation of the alkaloidal constituents of Senecio aegyptius L. resulted in the isolation and identification of senecionine, dehydrosenkirkine and probably an isomer of seneciphylline. TLC, HPLC and GLC showed the ... -
Q-Learning Based Closed-Loop Control of Anesthesia Administration by Accounting for Hemodynamic Parameter Variations
( Hamad bin Khalifa University Press (HBKU Press) , 2016 , Conference Paper)Critically ill patients in the intensive care units (ICUs) are often in acutely disturbed state of mind characterized by restlessness, illusions, and nervousness. Such patients, for instance, those who are mechanically ... -
Q-Map Application for Enrichment of a Mobile Directory Assistance Service
( NCCIT 2010 , 2010 , Article)The project described in this paper involves designing and developing a mobile map application, called the Qatar Map (Q-Map), which supports a telephone directory assistance service that runs over the terrestrial cellular ... -
‘Q-Storming’ to identify challenges and opportunities for integrating health and climate adaptation measures in Africa
( Elsevier , 2023 , Article)Introduction: Climate factors influence the state of human health and wellbeing. Climate-related threats are particularly being experienced by vulnerable populations in Africa. A Question (Q)-Storming session was convened ...
