Browsing Academic by Title
Now showing items 21862-21881 of 25644
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Vitamin K1 as a potential molecule for reducing single-walled carbon nanotubes-stimulated �-synuclein structural changes and cytotoxicity
( Dove Medical Press Ltd. , 2019 , Article)Aims: Different kinds of vitamins can be used as promising candidates to mitigate the structural changes of proteins and associated cytotoxicity stimulated by NPs. Therefore, the structural changes of �-syn molecules and ... -
Voice and Emphasis in Arabic Coronal Stops: Evidence for Phonological Compensation
( SAGE , 2021 , Article)The current study investigates multiple acoustic cues–voice onset time (VOT), spectral center of gravity (SCG) of burst, pitch (F0), and frequencies of the first (F1) and second (F2) formants at vowel onset—associated with ... -
Voicing in Qatari Arabic: Evidence for prevoicing and aspiration
( Hamad bin Khalifa University Press (HBKU Press) , 2016 , Conference Paper)Languages with a two-way voicing contrast in phonology usually contrast prevoiced b, d, g stops with voiceless unaspirated p, t, k stops or voiceless unaspirated stops with voiceless aspirated stops (Iverson & Salmons, ... -
Voicing perceptions of local job seekers and employees toward workforce nationalization and employment
( Emerald Publishing , 2023 , Article)Purpose: This study explores local Qatari job seekers' and employees' perceptions of the workforce nationalization strategy to address an inadequacy in the workforce nationalization literature in Gulf Cooperation Council ... -
Voiding function improves under long-term testosterone treatment (TTh) in hypogonadal men, independent of prostate size
( Springer Nature , 2023 , Article)Background: Functional hypogonadism is a condition in which some, but not all, older men have low testosterone levels. Rather than chronological age per se, the causality of hypogonadism includes obesity and impaired general ... -
Volarisation of Brewer's spent grain for noodles preparation and its potential assessment against obesity
( John Wiley and Sons Inc , 2023 , Article)Brewer's spent grain is the most prevalent low-cost by-product of brewing industry, contributing to about 85% of all by-products produced. It is of interest for food industry applications because of its high nutritional ... -
Volatile Components of the Phaeophyceae Hormophysa cuneiformis Growing Along Qatar Coasts
( Qatar University , 2007 , Article)The present work deals with the study on volatile compounds from the brown alga Hormophysa cuneiformis collected from the Northwest coast of Qatar on May 2002. Two extraction methods have been used: conventional hydrodistillation ... -
VOLATILITY ESTIMATION IN MISSING AT RANDOM HIGH-FREQUENCY FINANCIAL TIME SERIES
(2023 , Master Thesis)More than 15 years ago, the capital markets have seen significant development, introducing high-frequency trading and a shift of market towards high-frequency and algorithm trading. It was always believed that high-frequency ... -
Volatility forecasting, downside risk, and diversification benefits of Bitcoin and oil and international commodity markets: A comparative analysis with yellow metal
( Elsevier Inc. , 2019 , Article)This study examines the diversification and hedging properties of Bitcoin (BTC) and gold assets for oil and S&P GSCI investors. We model and forecast the volatility performance of the pairs BTC–oil, gold–oil, BTC–S&P GSCI, ... -
Volatility forecasting, downside risk, and diversification benefits of Bitcoin and oil and international commodity markets: A comparative analysis with yellow metal
( Elsevier , 2019 , Article)This study examines the diversification and hedging properties of Bitcoin (BTC) and gold assets for oil and S&P GSCI investors. We model and forecast the volatility performance of the pairs BTC-oil, gold-oil, BTC-S&P GSCI, ... -
Volatility transmission across currencies and commodities with US uncertainty measures
( Elsevier Inc. , 2016 , Article)This paper uses the Multi-chain Markov Switching model (MCMS) conditioned on US uncertainty measures (VIX, VIX-oil and FSI) to examine the patterns of volatility transmission across the resource, major and safe haven ... -
Voltage and congestion control in active distribution networks using fast sensitivity analysis
( Institute of Electrical and Electronics Engineers Inc. , 2020 , Conference Paper)Active distribution networks will meet new challenges in voltage and congestion control due to the high penetration levels of distributed generations (DG). Optimal voltage control techniques are mainly based on the relation ... -
The Voltage Collapse Problem Based On The Power System Loadability
( Qatar University , 1997 , Article)This paper addresses the problem of voltage instability at which the power system reaches its maximum admissible load. A voltage collapse proximity indicator (VCPI) is derived and its performance is investigated. The VCPI ... -
Voltage control in distribution networks using current source converter STATCOM based on state feedback controller and Kalman filter
( Institute of Electrical and Electronics Engineers Inc. , 2018 , Conference Paper)In transmission and Medium-Voltage (MV) distribution systems, the voltage can be controlled by reactive power due to the high X/R ratio of the cables/overhead lines. Maintaining voltage within a fixed limit is critical to ... -
Voltage dependence of the Ca2+ transient in endocardial and epicardial myocytes from the left ventricle of Goto Kakizaki type 2 diabetic rats
( Springer New York LLC , 2018 , Article)Diabetes mellitus is a major global health disorder and, currently, over 450 million people have diabetes with 90% suffering from type 2 diabetes. Left untreated, diabetes may lead to cardiovascular diseases which are a ... -
Voltage Independent Reactive Current Based Sensor for Static VAr Control Applications
( Institute of Electrical and Electronics Engineers Inc. , 2023 , Article)The use of renewable energy-based converters is continuously increasing in modern power systems which inject voltage harmonics in the line. In this work, a novel, simple technique based on a binary (on/off) control of an ... -
Voltage Profiling and Control of a Sub-Transmission Network with Integrated Renewable Energy Sources-A Case Study
( Institute of Electrical and Electronics Engineers Inc. , 2021 , Conference Paper)Traditional power generation methods are causing environmental issues. Some of the other drawbacks like line loading will increase the losses and the response time will be very high, which cannot be supporting the future ... -
Voltage sag mitigation employing dynamic voltage restorer with minimum energy requirements: Analysis and implementation
( Institution of Engineering and Technology , 2016 , Conference Paper)The objective of this paper is to design and implement an economical and efficient single phase dynamic voltage restorer (DVR) that compensates for voltage sag conditions. In this paper, different techniques of voltage sag ... -
Voltage sensorless current control of low power inverter-based distributed generation systems
( Institute of Electrical and Electronics Engineers Inc. , 2014 , Conference Paper)The control of power electronic converters is subjected to several challenges as measurement sensors drift, malfunction in harsh environments, non-ideal grid, and performance degradation due to the delay of discrete control ... -
Voltage stability evaluation of real power transmission system using singular value decomposition technique
( IEEE , 2008 , Conference Paper)Voltage stability is an important factor that needs to be taken into consideration during the planning and operation of power systems in order to avoid voltage collapse and subsequently partial or full system blackout. ...
