Results 91 to 100 of about 184,150 (234)

Power Swing Generated in Francis Turbines by Part Load and Overload Instabilities

Energies, 2017
Hydropower plays a key role in the actual energy market due to its fast response and regulation capacity. In that way, hydraulic turbines are increasingly demanded to work at off-design conditions, where complex flow patterns and cavitation appear ...
David Valentín, Alexandre Presas, Eduard Egusquiza, Carme Valero, Mònica Egusquiza, Matias Bossio   +5 more
doaj   +1 more source

Aircraft Wake-Vortex Evolution in Ground Proximity: Analysis and Parameterization [PDF]

, 2006
Field measurement data of 282 wake vortex pairs and respective environmental conditions acquired at Frankfurt Airport by means of lidar, Sodar/RASS, and ultrasonic anemometer are used to analyze wake vortex behavior in ground proximity. Exceptional cases
Steen, Meiko, Frank Holzäpfel, Meiko Steen, Holzäpfel, Frank   +3 more
core   +1 more source

An Integrated Statistical and Machine Learning Framework for Predicting the Dry Sliding Tribological Behavior of CFRP and GFRP Composites Under Environmental Aging and Loading Conditions

Polymer Composites, EarlyView.
The graphical abstract presents the experimental and data‐driven framework used to investigate the dry sliding tribological behavior of CFRP and GFRP composites. The effects of seawater, engine oil, diesel fuel, aging time, and normal load on the specific wear rate (SWR) and coefficient of friction (COF) were evaluated using pin‐on‐disc tests, ANOVA ...
Ahmet Saylık, İhsan Tuğal, Şemsettin Temiz   +2 more
wiley   +1 more source

Diagnosis of Portal Hypertension: Advancing Towards Non‐Invasive Solutions

Portal Hypertension &Cirrhosis, EarlyView.
This review systematically summarizes a full spectrum of non‐invasive diagnostic approaches for portal hypertension (PH), including imaging modalities, elastography, serum biomarkers, composite scoring systems and endoscopic ultrasound‐guided portal pressure gradient (EUS‐PPG), and analyzes their performance across different liver disease etiologies ...
Lijia Yin, Huikuan Chu, Ling Yang
wiley   +1 more source

Modal analysis of vortex rope using dynamic mode decomposition

Physics of Fluids
The decelerating swirling flow in the draft tube of hydraulic turbines at part load conditions often results in a self-induced instability known as vortex rope. This phenomenon is associated with detrimental pressure pulsations in the hydropower system that need to be mitigated.
Saeed Salehi, Håkan Nilsson
openaire   +2 more sources

Wake-Vortex Topology, Circulation, and Turbulent Exchange Processes [PDF]

, 2012
Large eddy simulations () of aircraft wake vortex evolution in various turbulent and stably stratified atmospheric environments have been conducted with two different LES codes.
Hennemann, Ingo, Misaka, Takashi, Holzäpfel, Frank   +2 more
core  

Precision agriculture for water saving: The case of processing tomato and table grape

PLANTS, PEOPLE, PLANET, EarlyView.
Agriculture faces increasing pressure to produce high‐quality food while reducing water use under intensifying climate change and water scarcity. This study compared sensor‐based precision irrigation, drone monitoring, and near‐infrared spectroscopy with conventional farmer management in table grape and processing tomato production systems.
Giuseppe Ferrara, Alessandro Pesole, Rita De Marco, Sara Bisceglie, Giovanni Popeo, Simone Pascuzzi, Luigi Tedone   +6 more
wiley   +1 more source

Machine learning‐driven advances in carbon‐based quantum dots: Opportunities accompanied by challenges

Responsive Materials, EarlyView.
Machine learning provides a unifying framework to connect structure, fluorescence properties, and applications of carbon‐based quantum dots. This review highlights how data‐driven strategies enable fluorescence regulation, reveal underlying mechanisms, and accelerate the rational design of functional carbon dots.
Liangfeng Chen, Siwei Yang, Xiangqian Cui, Ziheng Liu, Hang Wang, Yongqiang Li, Peng He, Miao Wang, Guqiao Ding   +8 more
wiley   +1 more source

Enhancing Bulb Turbine Performance Assessing Air Injection for Vibration Mitigation and Hydrofoil Cavitation [PDF]

Journal of Applied Fluid Mechanics
Small hydro technology is playing a crucial role in advancing sustainable, clean energy policies as part of the global hydro development strategy. Its contribution to social and economic development is becoming more prominent, particularly in ensuring ...
S. Praveen, S. Marimuthu, B. Alqahtani, G. Bharathiraja, G. Gokilakrishnan   +4 more
doaj   +1 more source

Antimicrobial Residues in a Key Cerrado River: Distribution, Persistence, and Effects on Zebrafish Embryo‐Larval Development

Environmental Toxicology, EarlyView.
ABSTRACT The current study aimed to quantify the antimicrobials amoxicillin (AMX), cefazolin (CFZ), chloramphenicol (CHL), metronidazole (MTZ), and sulfamethoxazole (SX) in effluents and surface water of an important Cerrado river, calculate their half‐lives, and analyze their ecotoxicity following single and combined exposures.
Náthala Maria Simão, Igor Romeiro dos Santos, Jerônimo Raimundo de Oliveira Neto, Flávio Olimpio Sanches Neto, Felipe Cirqueira Dias, Jéssyca Moreira Morais, Lorranny Pereira de Assis Valadares, Naiara Raica Lopes de Oliveira, Mirelle Garcia Silva Bailão, Luiz Carlos da Cunha, Valter Henrique Carvalho‐Silva, Thiago Lopes Rocha, Elisa Flávia Luiz Cardoso Bailão   +12 more
wiley   +1 more source