Results 31 to 40 of about 21,441 (307)

Theoretical Study of the Effects of Hybridization on the Emission and Performance Characteristics of a Turbocharged Aircraft Piston Engine

Energies
In recent years, numerous studies have focused on reducing emissions from modern reciprocating engines without compromising their performance characteristics.
Nikolaos Lytras, Roussos Papagiannakis, Alexandros Vouros, Georgios Mavropoulos   +3 more
doaj   +1 more source

A 2D lightweight instrumented wheel for assessing wheelchair functionality/activity

Journal of Rehabilitation and Assistive Technologies Engineering, 2023
Introduction Force measurement wheels are essential instruments for analysing manual wheelchair propulsion. Existing solutions are heavy and bulky, influence propulsion biomechanics, and are limited to confined laboratory environments.
Reto Togni, Manuel Müller, Stefan Plüss, William R Taylor, Roland Zemp   +4 more
doaj   +1 more source

Application of the body force method in the rim driven thruster

International Journal of Naval Architecture and Ocean Engineering, 2022
The Rim Driven Thruster (RDT) has become a popular ship propulsion system in recent years. Due to the complex structure of RDT, a great number of computational resources are required to study the interaction between RDT and hull by adopting the ...
Boao Cai, Binbin Tian, Liaoyuan Qiu, Qing Xu, Xiaofei Mao, Wei He, Wei Chai   +6 more
doaj   +1 more source

A RANS Modelling Approach for Predicting Powering Performance of Ships in Waves [PDF]

, 2013
In this paper, a modelling technique for simulating selfpropelled ships in waves is presented. The flow is modelledusing a RANS solver coupled with an actuator diskmodel for the propeller.
Hudson, Dominic, Winden, Bjorn, Turnock, Stephen, Björn Windén, Stephen Turnock, Dominic Hudson, Hudson, Dominic A., Turnock, S.R.   +7 more
core   +1 more source

Systems design of a hybrid sail pole-sitter [PDF]

, 2011
This paper presents the preliminary systems design of a pole-sitter. This is a spacecraft that hovers over an Earth pole, creating a platform for full hemispheric observation of the polar regions, as well as direct-link telecommunications. To provide the
Colin R. McInnes, McInnes, Colin, Ceriotti, Matteo, Ceriotti, M., Matteo Ceriotti, McInnes, C.R.   +5 more
core   +1 more source

Physician‐Scientist Pipeline for Pediatric Rheumatology: The Current Landscape and Future Perspectives

Arthritis Care &Research, EarlyView.
Over the past 50 years, the science of pediatric rheumatology has grown exponentially due to an expansion in the understanding of complex rheumatic conditions and a surge in novel targeted therapeutics. Physician‐scientists in the field of pediatric rheumatology have played major roles in these advancements that have improved the care of children ...
Ekemini A. Ogbu, Linda T. Hiraki, Mara L. Becker   +2 more
wiley   +1 more source

Experimental Testing and Optimization-Based Performance Modeling of a Microjet Engine

Energies
In this paper, experimental results for a JetCat P80 microjet engine mounted on the GUNT ET796 microscale testing facility are presented. The data set is initially used to verify trends in performance parameters, including thrust force, compressor ...
Alexandros Vouros, Andreas Kyriazis, Ioannis Templalexis, Roussos Papagiannakis   +3 more
doaj   +1 more source

Servicing polar platforms using electric propulsion [PDF]

, 1992
The future of space development has been examined in the context of the infrastructure necessary support it. It is concluded that the selection of propulsion systems for in-orbit transportation requires the development of general computer codes capable
Welch, C. S.
core  

Is effective force application in handrim wheelchair propulsion also efficient? [PDF]

, 2009
Background: Efficiency in manual wheelchair propulsion is low, as is the fraction of the propulsion force that is attributed to the moment of propulsion of the wheelchair.
Bregman, D.J.J., Veeger, H.E.J., Veeger, H.E.J.; id_orcid, Drongelen, S.V. van, van Drongelen, S.V.   +4 more
core   +1 more source

Air‐Pressure–Actuated Vibroacoustic Metamaterial With Tunable Bandgap: Design, Modeling, and Characterization

Advanced Engineering Materials, EarlyView.
This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal, Michael M. Becker, Sarah C. L. Fischer   +2 more
wiley   +1 more source