Results 21 to 30 of about 559,608 (264)
BEYOND GRAVITOELECTROMAGNETISM: CRITICAL SPEED IN GRAVITATIONAL MOTION [PDF]
International Journal of Modern Physics D, 2005 A null ray approaching a distant astronomical source appears to slow down, while a massive particle speeds up in accordance with Newtonian gravitation. The integration of these apparently incompatible aspects of motion in general relativity is due to the existence of a critical speed.
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Critical Speed Control for a Fixed Blade Variable Speed Wind Turbine
Energies, 2017 A critical speed controller for avoiding a certain rotational speed is presented. The controller is useful for variable speed wind turbines with a natural frequency in the operating range.
Morgan Rossander +2 more
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TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C, 1995 Internal resonance of cracked rotors is investigated using 2-degree-of-freedom rotor systems. Phenomena at the major critical speed and other subcritical speeds in the precritical speed range are discussed theoretically and experimentally. Phenomena in a lateral oscillation model with internal resonance and in an inclination oscillation model with no ...
Yukio ISHIDA, Kazuharu HIROKAWA
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Critical wind speed at which trees break [PDF]
Physical Review E, 2016 Data from storms suggest that the critical wind speed at which trees break is constant (≃42m/s), regardless of tree characteristics. We question the physical origin of this observation both experimentally and theoretically. By combining Hooke's law, Griffith's criterion, and tree allometry, we show that the critical wind speed indeed hardly depends on ...
Virot, E. +4 more
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Sports, 2020 Maximal oxygen uptake (VO2max) and critical speed (CS) are key fatigue-related measurements that demonstrate a relationship to one another and are indicative of athletic endurance performance.
Joshua D. Dexheimer +5 more
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A Dynamic Analysis of a Flexible Rotor in Ball Bearings with Nonlinear Stiffness Characteristics
International Journal of Rotating Machinery, 1997 This paper presents an effective analysis approach for a flexible rotor in ball bearings with nonlinear stiffness characteristics to obtain realistic dynamic behavior results.
Dong-Soo Lee, Dong-Hoon Choi
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Sensors, 2014 The objective of the present study was to deal with the rotordynamics of the rotor of an ultra-high speed PM type synchronous motor-generator for a 500 W rated micro gas turbine generator.
Do-Kwan Hong +4 more
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Communications, 2023 Among the most important operational properties of articulated buses, ensuring their safety, it is necessary to note the course stability of traffic (CST), as often the loss of CST of a vehicle is accompanied by an accident.
Volodymyr Sakhno +6 more
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Pediatric Blood &Cancer, EarlyView.ABSTRACT Neuroblastoma is the most common extracranial solid tumor in early childhood. Its clinical behavior is highly variable, ranging from spontaneous regression to fatal outcome despite intensive treatment. The International Society of Pediatric Oncology Europe Neuroblastoma Group (SIOPEN) Radiology and Nuclear Medicine Specialty Committees ...
Annemieke Littooij +11 more
wiley +1 more source
IEEE Access, 2018 As a non-contact life detecting equipment of smart campus, the ultra-wide band (UWB) radar life detector is widely used in finding victims of post-disaster search and rescue.
Buge Liang +4 more
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