Results 111 to 120 of about 491,279 (390)
Evaluation of the use of on-board spacecraft energy storage for electric propulsion missions [PDF]
On-board spacecraft energy storage represents an under utilized resource for some types of missions that also benefit from using relatively high specific impulse capability of electric propulsion.
Palmer, F. M., Poeschel, R. L.
core +1 more source
Reynolds number limits for jet propulsion: A numerical study of simplified jellyfish [PDF]
, 2010 The Scallop Theorem states that reciprocal methods of locomotion, such as jet propulsion or paddling, will not work in Stokes flow (Reynolds number = 0).
Herschlag, Gregory, Miller, Laura A.
core +3 more sources
Surface Modification of Sol–Gel Synthesized Ba0.85Ca0.15Zr0.1Ti0.9O3 using Stearic Acid Additives
Advanced Engineering Materials, EarlyView.This study explores a novel approach to enhance the piezoelectric performance of lead‐free BCZT ceramics synthesized via the sol–gel method. By coating the BCZT powder with only a 0.69 nm stearic acid layer, the electromechanical response is significantly boosted up to 359 pC N−1, revealing promising implications for high‐performance sensor and ...
Michelle Weichelt +6 more
wiley +1 more source
Space propulsion systems. Present performance limits and application and development trends [PDF]
Typical spaceflight programs and their propulsion requirements as a comparison for possible propulsion systems are summarized. Chemical propulsion systems, solar, nuclear, or even laser propelled rockets with electrical or direct thermal fuel ...
Buehler, R. D., Lo, R. E.
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Advanced Engineering Materials, EarlyView.A powerful electronic control system enables a dielectric elastomer pump to operate at resonance, matching conventional pump performance. Using self‐sensing to reconstruct load pressure dynamically, the adaptive control adjusts resonance frequency accordingly.
Matthias Baltes +3 more
wiley +1 more source
A quantum propulsion method [PDF]
, 2019 Experimental proof of concept for a new propulsion method is presented. Ammonia gas (NH3) is exposed to a strong electric field aiming to align the orientation of the polar molecules. This results in partial alignment of the quantum tunneling of nitrogen atoms, specific for the ammonia, creating bias in the pressure distribution and a resultant force ...
openaire +2 more sources
Advanced Engineering Materials, EarlyView.The dielectric elastomer‐based electropneumatic device (DE‐EPD) is a vacuum‐assisted ventricular assist device (VAD) that delivers high performance (85 mmHg, 6.8 L min−1) with low power consumption. Unlike traditional motor‐driven VADs, it is lightweight, quiet, energy‐efficient, and provides pulsatile flow. Validated in a simulated circulation system,
Amine Benouhiba +6 more
wiley +1 more source
Internal Temperature Evolution Metrology and Analytics in Li‐Ion Cells
Advanced Functional Materials, EarlyView.This study investigates the non‐linear evolution of internal temperatures across diverse operating conditions, highlighting the disparities between internal and external measurements and the resulting thermal asymmetries. The coupled thermo‐electrochemical modeling framework provides a comprehensive analysis of various heat generation modes, examining ...
Anuththara S. J. Alujjage +5 more
wiley +1 more source
Maintaining technical excellence requires a national plan [PDF]
To meet the challenge of technical excellence, AIA established a rocket propulsion committee to develop the National Rocket Propulsion Strategic Plan. Developing such a plan required a broad spectrum of experience and disciplines. The Strategic Plan team
Davidson, T. F.
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Mathematical Biosciences and Engineering, 2015 Mucociliary clearance is the first line of defense in our airway. The purpose of this study is to identify and study key factors in the cilia motion that influence the transport ability of the mucociliary system.
Ling Xu, Yi Jiang
doaj +1 more source