Results 61 to 70 of about 30,030 (378)

Improving the Characteristics of the Direct FOC Strategy in DFIG‐Based Wind Turbine Systems Using FOIDD and FOPD Controllers

open access: yesEnergy Science &Engineering, EarlyView.
This study presents a new control strategy for doubly fed induction generator (DFIG) wind turbine systems to overcome the limitations of traditional direct field control using proportional‐integral (DFOC‐PI) regulators, which are sensitive to coefficient changes and lead to low power quality.
Hamza Gasmi   +5 more
wiley   +1 more source

On modeling chronic detachment of periphyton in artificial rough, open channel flow [PDF]

open access: yes, 2012
Periphyton communities, which are native to river beds, serve as a functional indicator of river health but remain one of the least-studied communities despite the significant increase in the examination of aquatic microbial communities in recent years ...
Graba, Myriam   +3 more
core   +2 more sources

Seasonal Performance Analysis of Monocrystalline and Polycrystalline Photovoltaic Solar Panels Under Dust Deposition in Niamey, Niger

open access: yesEnergy Science &Engineering, EarlyView.
ABSTRACT This paper investigates the impact of dust accumulation and temperature on the performance of monocrystalline and polycrystalline photovoltaic (PV) panels under the climatic conditions of Niamey, Niger, with a focus on seasonal variations. High‐resolution performance data were collected across the rainy, Harmattan, and hot seasons to evaluate ...
Falmata Abdoulaye Moussa   +3 more
wiley   +1 more source

Impact of tropospheric modelling and atmospheric pressure loading on GNSS position repeatability

open access: yesGeodetski Vestnik
This study investigates the impact of tropospheric modelling strategies on the repeatability of daily GNSS position estimates across Mediterranean and high-latitude regions through comprehensive analysis of multiple factors: zenith total delay estimation,
Hicham Dekkiche   +4 more
doaj   +1 more source

Do Fossil Fuel Subsidies Crowd Out Health Expenditure? A Country‐Level Longitudinal Analysis

open access: yesHealth Economics, EarlyView.
ABSTRACT Annually, countries allocate hundreds of millions of dollars to subsidize fossil fuels, often at the expense of public health and environmental sustainability. This undermines progress toward Sustainable Development Goals (SDG) 3 (Good Health and Well‐Being) and 13 (Climate Action).
Judite Gonçalves   +6 more
wiley   +1 more source

Existence and multiplicity of solutions for elliptic equations with singular growth

open access: yesElectronic Journal of Differential Equations, 2016
In this article, we consider an elliptic problem with singular and critical growth. We prove the existence and multiplicity of solutions for the resonant and nonresonant cases.
Yasmina Nasri, Ali Rimouche
doaj  

A review of the Anthicidae of the Maltese Islands (Central Mediterranean) (Coleoptera) [PDF]

open access: yes, 2003
Based on the study of about 900 specimens collected recently and at the beginning of the last century, information on the Anthicidae fauna of the Maltese Islands is updated.
Mifsud, David, Nardi, Gianluca
core  

Monument historique ou système bien vivant ? Les foggaras des oasis du Touat (Algérie) et leur réalimentation en eau par pompage

open access: yes, 2017
Durant les cinq dernieres decennies, le Sahara algerien a connu plusieurs programmes de developpement agricole fondes sur l'exploitation de l'eau souterraine.
Salem Idda   +4 more
semanticscholar   +1 more source

Revisiting the Nexus Between Trade Liberalisation and Income Inequality: The Case of Sub‐Saharan African Countries

open access: yesInternational Journal of Finance &Economics, EarlyView.
ABSTRACT This paper examines the impact of trade liberalisation on income inequality across 24 Sub‐Saharan African (SSA) countries from 2000 to 2020. Using IV‐Tobit and 2SLS models, we consistently find that greater trade openness significantly exacerbates inequality in the region. Critically, we document an inverted U‐shaped relationship between trade
Guivis Zeufack Nkemgha   +2 more
wiley   +1 more source

Averaging method for ordinary differential inclusions with maxima

open access: yesElectronic Journal of Differential Equations, 2018
We consider ordinary differential inclusions with maxima perturbed by a small parameter and give justification of the method of averaging for this type of inclusions.
Bachir Bar, Mustapha Lakrib
doaj  

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