Results 51 to 60 of about 89,370 (155)

Quantifying CO2 Emissions From Smaller Anthropogenic Point Sources Using OCO‐2 Target and OCO‐3 Snapshot Area Mapping Mode Observations

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 2, 28 January 2025.
Abstract We quantify CO2 emissions from smaller anthropogenic point sources compared with earlier satellite studies, which have mostly focused on mid‐sized (∼10 MtCO2/year) and larger fossil fuel burning power plants. Two types of Orbiting Carbon Observatory (OCO) observation modes are used: OCO‐2 Target mode and OCO‐3 Snapshot Area Mapping (SAM) mode.
Omid Moeini, Ray Nassar, Jon‐Paul Mastrogiacomo, Megan Dawson, Christopher W. O’Dell, Robert R. Nelson, Abhishek Chatterjee   +6 more
wiley   +1 more source

Enhanced aerodynamic performance of NACA4412 airfoil through integrated plasma actuator and Gurney flap flow control

Results in Engineering
This study explores advanced flow control techniques for enhancing the aerodynamic efficacy of the NACA4412 airfoil. By employing a combination of passive and active flow control methods, this research aims to improve lift and reduce drag, particularly ...
K.V. Karthikeyan, R. Harish
doaj   +1 more source

Comparative Analysis Among Different Performance Improvement Techniques for Wind Turbines in Terms of Energy and Economy for Small, Medium, and Large‐Scale Applications

International Journal of Energy Research, Volume 2025, Issue 1, 2025.
With a view to finding the best approach to maximize the wind energy harvesting from wind turbines, this research has focused towards assessing the effects of different innovative modifications to wind turbines at different wind speed conditions and comparing them in terms of aerodynamic performance, economy, and environmental impact.
Mim Mashrur Ahmed, Mahadi Hasan Masud, Md. Hasibul Hasan Himel, Mhia Md. Zaglul Shahadat, Mucahit Aydin   +4 more
wiley   +1 more source

Effect of gurney flaps on the performance of a vertical axis wind turbine under icing condition

International Journal of Renewable Energy Development
To investigate the operational characteristics of a vertical-axis wind turbine equipped with Gurney flap blades in icy conditions, the study employs the pitching and sinking movements of an individual blade to replicate the cyclic oscillations ...
Hexiang Yu, Zhehui Zheng, Pei Yang
doaj   +1 more source

A novel method for estimating avian roost sizes using passive acoustic recordings

Ecological Solutions and Evidence, Volume 5, Issue 4, October–December 2024.
The Javan myna, Acridotheres javanicus, is an invasive communally roosting species in Singapore (left panel, photo taken by J.J. Harrison). We deployed a passive acoustic recorder (centre panel) and analysed their roost chorus by applying machine learning methods. Our estimated bird counts over time using our acoustic model matched the automated visual
Malcolm C. K. Soh, Mandar A. Chitre, Matthias Hoffmann‐Kuhnt, Benjamin P. Y.‐H. Lee, Kenneth B. H. Er   +4 more
wiley   +1 more source

CFD analysis of Gurney flap orientation and plasma actuation for turbulent flow control over NACA4412 airfoil

Results in Engineering
This study conducts a numerical investigation into advanced flow control strategies aimed at enriching the aerodynamic enhancement of airfoil of NACA4412 through the integration of passive and active techniques.
K.V. Karthikeyan, R. Harish
doaj   +1 more source

Comprehensive study of vortices interaction and blades height effect in a Darrieus vertical axis wind turbine with J‐type blades

Energy Science &Engineering, Volume 12, Issue 10, Page 4371-4393, October 2024.
This study utilizes a 3D numerical analysis to examine the influence of different vortices generated on turbine efficiency with straight and J‐type blades. The numerical simulation of this study employs the Reynolds‐averaged Navier–Stokes equations and ‎sliding ‎mesh techniques ‎to model the rotational motion of blades more accurately about the turbine
Ramin Farzadi, Derrick Gharapetian, Majid Bazargan   +2 more
wiley   +1 more source

Multi-Objective Optimization Design of Dynamic Performance of Hydrofoil with Gurney Flap

Journal of Marine Science and Engineering
The horizontal axis tidal turbine, as a crucial device for capturing tidal energy, has gained significant attention because it has better energy efficiency performance.
Xiangyun Zhang, Wuping Yao, Lan Ding, Bin Huang   +3 more
doaj   +1 more source

Resisting change: Explaining education policy reforms in Ghana

Politics &Policy, Volume 52, Issue 2, Page 384-402, April 2024.
Abstract This article examines the complexities surrounding the implementation of comprehensive sexuality education (CSE) within Ghana's basic education system, exploring the intersection of religious, cultural, and political factors. Introducing CSE has sparked significant public discourse and resistance in Ghana, where religious and cultural beliefs ...
Saaka Sulemana Saaka
wiley   +1 more source

Numerical Investigation of an Airfoil with a Gurney Flap [PDF]

, 1998
A two-dimensional numerical investigation was performed to determine the effect of a Gurney flap on a NACA 4412 airfoil. A Gurney flap is a flat plate on the order of 1–3% of the airfoil chord in length, oriented perpendicular to the chord line and ...
Ross, James C., James C. Ross, Russell M. Cummings, Jang, Cory S., Cummings, Russell M., Cory S. Jang   +5 more
core   +1 more source