Browsing Academic by Title
Now showing items 3423-3442 of 26404
-
Calcareous Nannoplankton From The Turonian-Maastrichtian Sequence East Of El Qusaima, Ne Sinai, Egypt
( Qatar University , 1992 , Article)On terms of calcareous nannoplankton, the Turonian-Maastrichtian sequence in the studied area is subdivided into a number of nannoplankton zones. The recorded biozones represent the Turonian, Coniacian, Campanian and ... -
Calcined hydrotalcites of varying Mg/Al ratios supported Rh catalysts: highly active mesoporous and stable catalysts toward catalytic partial oxidation of methane
( Springer Nature , 2021 , Article)Catalytic partial oxidation of methane to produce syngas were studied over calcined hydrotalcites of varying Mg/Al ratios supported Rh catalysts. Hydrotalcites of varying Mg/Al ratios were prepared using their hydroxide ... -
Calcite Scale Inhibition Using Environmental-Friendly Amino Acid Inhibitors: DFT Investigation
( American Chemical Society , 2021 , Article)Scale prevention is a long-term challenge. It is essential for ensuring the optimum utilization of oil and gas wells and minimizing economic losses due to disruptions in the hydrocarbon flow. Among the commonly precipitated ... -
Calcium Carbonate Content, Some Chemical And Physical Properties Of The Sudan Gezira Soils And Their Implications
( Qatar University , 1991 , Article)Eight soil pcdons representing a range of aridisols, vertisols and recent alluvium were studied for various chemical and physical properties. Generally the soils were clayey except the recent alluvium which was loamy but ... -
Calcium carbonate particles loaded with triethanolamine and polyethylenimine for enhanced corrosion protection of epoxy coated steel
( Elsevier Ltd , 2020 , Article)Calcium carbonate particles were synthesized and loaded with a mixture of two corrosion inhibitors, triethanolamine (TEA) and polyethylenimine (PEI). These particles can serve as pH-sensitive additives in epoxy coatings ... -
Calcium deficiency in hydroxyapatite and its drug delivery applications
( Institution of Engineering and Technology , 2018 , Article)In this work, calcium deficient hydroxyapatites (HAPs) [Ca 10 ? x (PO 4 ) 6 (OH) 2 ] [where x = 0 ? 0.3] were synthesised by precipitation method and calcined samples were characterised by Fourier transformation infrared ... -
Calcium Nitrite Effect On Setting Of Cement At Various Temperatures
( Qatar University , 2000 , Article)Calcium Nitrite, which is used as corrosion inhibitor, accelerates stiffening rates of cement. This paper deals with the effect of calcium nitrate on setting times of cement pastes at various curing temperatures. Four ... -
Calculating the response of waveguides to base excitation using the wave and finite element method
( SAGE , 2021 , Article)The prediction of the response of waveguides to time-harmonic base excitations has many applications in mechanical, aerospace and civil engineering. The response to base excitations can be obtained analytically for simple ... -
Calculating the Velocity of Sound in Real Pure Component Gases and Mixtures of Real Gases
( Qatar University , 1989 , Article) -
Calculation of derating factors based on steady-state unbalanced multiphase induction machine model under open phase(s) and optimal winding currents
( Elsevier , 2014 , Article)Multiphase machines have become a promising candidate in high-power applications as they offer many advantages over their three-phase counterparts. The main salient feature is the high fault tolerance capability. During ... -
Calculation Of Mass Yield Distributions In Fission Induced By High Energy Protons
( Qatar University , 1991 , Article)An analytical expression is obtained for the mass-yield distribution in fission induced by high-energy protons, using a two-step model. In the first step, the incident proton penetrates the target nucleus, knocking out ... -
Calibration & Temperature Controlled Setup for Air Quality Sensors
( Hamad bin Khalifa University Press (HBKU Press) , 2016 , Conference Paper)Indoor air pollution is a major issue affecting public health. Due to hot climate, humidity and lack of natural green spaces, life is mostly confined indoors in many countries of the MENA region. Vulnerable population, ... -
Calibration of the double Heston model and an analytical formula in pricing American put option
( Elsevier B.V. , 2021 , Article)This paper proposes a novel approach to pricing of American put option under double Heston model. We develop an analytical solution to the double Heston partial differential equation (double Heston PDE) using the equivalent ... -
Calibration of time features and frequency features in the time-frequency domain for improved detection and classification of seizure in newborn EEG signals
( IEEE Computer Society , 2012 , Conference Paper)This paper presents new time-frequency features for seizure detection in newborn EEG signals. These features are obtained by calibrating relevant time features and frequency features in the joint time-frequency domain. The ... -
Calix[4]arene-clicked clay through thiol-yne addition for the molecular recognition and removal of Cd(II) from wastewater
( Elsevier B.V. , 2020 , Article)A novel type of hybrid Clay/Calix[4]arene (denoted as B-S-Calix), was prepared through fast photo-induced radical-mediated thiol–yne addition between a thiolated clay and an alkynylated calix[4]arene. The photo-induced ... -
Call for emergency action to restore dietary diversity and protect global food systems in times of COVID-19 and beyond: Results from a cross-sectional study in 38 countries
( Elsevier , 2023 , Article)Background The COVID-19 pandemic has revealed the fragility of the global food system, sending shockwaves across countries' societies and economy. This has presented formidable challenges to sustaining a healthy and ... -
A Call to Action to Transform Pharmacy Education and Practice in the Arab World.
( Aacp American Association of Colleges , 2019 , Other)Al-Ghananeem and colleagues recently evaluated health care and pharmacy education in some countries of the Arab world focusing on clinical pharmacy education and practice. They identified six key strategies to meet the ... -
Calmodulin Interacts and Regulates Enzyme Activity of the Mammalian Sperm Phospholipase C
( Elsevier , 2017 , Article)Sperm-specific Phospholipase C zeta (PLCζ) is widely considered to be the sole, physiological stimulus responsible for the generation of Ca2+ oscillations that induce egg activation and early embryo development during ... -
Calmodulin Mutations Associated with Congenital Cardiac Disease Display Novel Biophysical and Biochemical Characteristics
( Elsevier , 2018 , Article)Calmodulin (CaM) is a cytoplasmic multifunctional calcium (Ca2+)-binding messenger that interacts with the cardiac ryanodine receptor (RyR2), a large transmembrane Ca2+ channel that mediates Ca2+ release from the sarcoplasmic ... -
Caloric expenditure estimation for health games
( Hamad bin Khalifa University Press (HBKU Press) , 2013 , Conference Paper)With the decline in physical activities among young people, it is essential to monitor their physical activity and ensure their calorie expenditure is within the range necessary to lead a healthy life style. For many ...
