Results 51 to 60 of about 1,453 (244)

Bioinspired Passive Flow Routing to Mitigate Thrombosis in Prosthetic Heart Valves and Cardiovascular Devices

Advanced Science, EarlyView.
Bioinspired passive flow routing mitigates thrombosis in cardiovascular devices by redirecting a small fraction of forward flow into stagnation‐prone regions. Inspired by avian alula and aircraft slat mechanisms, strategically placed routing channels restore washout around mechanical heart valves, reducing low‐shear exposure by four orders of magnitude
Yevgeniy Kreinin, Mark Epshtein, Yahel Talmon, Tirosh Mekler, Itay Or, Mahli Raad, Gil Bolotin, Josué Sznitman, Netanel Korin   +8 more
wiley   +1 more source

Effect of fuel injection rate shapes on mixture formation and combustion characteristic in a free-piston diesel engine generator

Advances in Mechanical Engineering, 2018
The free-piston engine generator is a new power machinery, which removes the crank-shaft mechanism. This article aims to study the impact of different injection rate shapes (left triangle, rectangle, and right triangle) on the free-piston engine ...
Cuijie Han, Chenheng Yuan, Yituan He, Yang Liu   +3 more
doaj   +1 more source

Kresling Origami‐Based Metamaterial Robot for Dynamic Electromagnetic Control

Advanced Science, EarlyView.
A reconfigurable metamaterial system integrates deformable origami units with high‐permittivity ceramic plates. Pneumatic switching between structural states alters local resonance conditions, enabling dynamic radar stealth and adaptive microwave reflection for mobile communication.
Xinxi Zeng, Long Zhou, Shaojie Xi, Yixuan Gao, Desheng Pan, Chaoyang Sun, Haoxin Sun, Xian Wang, Lingyun Qian, Peipei Li, Pengfei Zhu, Bo Li, Jiang Luo, Ji Zhou   +13 more
wiley   +1 more source

Absorption of Broadband Low‐Frequency Sound Beyond the Thermodynamics Limit: An Acoustic Resonator With Magnetic Bearing

Advanced Science, EarlyView.
This work presents a magnetic‐bearing acoustic resonator that overcomes the thermodynamics limit of sound absorption. By introducing tunable negative stiffness, it achieves broadband low‐frequency absorption within a compact cavity, far exceeding the performance achievable by classic mass‐tuned designs.
Ying Hu, Zhe Zhang, Bohua Huang, Xue Han, Hallam Bastin Kilcoyne, Lixi Huang   +5 more
wiley   +1 more source

Influence of Crank Angle Offset on the Mechanical Performance of Different Hydrogen-Fueled Opposed-Piston Engine Architectures

Applied Sciences
Decarbonization of the automotive sector is essential to achieve global climate goals, as passenger cars contribute a substantial share of CO2 emissions.
Andrea Piergiacomi, Saverio Giulio Barbieri, Valerio Mangeruga, Matteo Giacopini   +3 more
doaj   +1 more source

Linear Generator for a Free Piston Stirling Engine [PDF]

Journal of Electrical and Electronics Engineering, 2014
In this paper we present some aspects about the design of a Stirling engine driven linear generator. There are summarised the main steps of the magnetic and electric calculations with application to a particular case of a cogeneration plant bassed on ...
OROS (POP) Teodora Susana, VADAN Ioan, POP Radu, BRAD Claudiu   +3 more
doaj  

Resonant Combustion Start Considering Potential Energy of Free-Piston Engine Generator

Energies, 2020
Free-piston engine generators without a crank mechanism are expected to be used in series hybrid vehicles because of their lower losses. The series hybrid system requires a low starting thrust because the engine frequently starts depending on the battery
Mitsuhide Sato, Takumi Goto, Jianping Zheng, Shoma Irie   +3 more
doaj   +1 more source

Improved Direct Ink Writing of Liquid Metal Foams via Liquid Additives

Advanced Electronic Materials, EarlyView.
The ability to pattern liquid metal is useful for making soft electrical and thermal devices. Dispensing liquid metal from a nozzle naturally results in the formation of spheroidal droplets, making direct‐write printing challenging. Liquid metal foams containing pockets of air can extrude as filaments, albeit inconsistently.
Febby Krisnadi, Tushar Sakorikar, Man Hou Vong, Michael D. Dickey   +3 more
wiley   +1 more source

Hydrogen Utilization in Free Piston Engines: A Performance Investigation [PDF]

Hydrogen, Fuel Cell & Energy Storage
This paper presents a dynamic analysis of a free-piston engine (FPE) using hydrogen gas as the working fluid for the first time. Initially, the governing dynamic equations of the FPE are derived.
Amir Mobini, Amir Fassih, Shahriar Niknejad, Shahryar Zare   +3 more
doaj   +1 more source

Electrolyte Confinement Enables a Continuous Transition From Battery‐Like to Capacitor‐Like Na+ Storage via Solvent Co‐Intercalation

Advanced Energy Materials, EarlyView.
Layered titanates with expanded interlayer galleries reveal how nanoconfinement and electrolyte solvation control Na+ storage kinetics. In diglyme electrolyte, solvent co‐intercalation and strongly reduced interfacial impedance enable increasingly capacitor‐like behavior with increasing interlayer spacing, whereas carbonate electrolytes form resistive ...
Yoga Trianzar Malik, Samra, Mennatalla Elmanzalawy, Thomas Pechon, Jameela Karol, Jaehoon Choi, Robert Leiter, Maciej Tobis, Wan‐Yu Tsai, Xiaolin Liu, De‐en Jiang, Simon Fleischmann   +11 more
wiley   +1 more source