Results 211 to 220 of about 145,297 (260)
Some of the next articles are maybe not open access.
Journal of Magnetic Resonance, 2023
The resolution of magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectra remains bounded by the spinning frequency, which is limited by the material strength of MAS rotors. Since diamond is capable of withstanding 1.5-2.5x greater MAS frequencies, compared to state-of-the art zirconia, we fabricated rotors from single crystal diamond. When
Natalie C, Golota +13 more
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The resolution of magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectra remains bounded by the spinning frequency, which is limited by the material strength of MAS rotors. Since diamond is capable of withstanding 1.5-2.5x greater MAS frequencies, compared to state-of-the art zirconia, we fabricated rotors from single crystal diamond. When
Natalie C, Golota +13 more
openaire +2 more sources
Current Protocols in Molecular Biology, 1996
AbstractThis appendix presents useful basic information, including common abbreviations, useful measurements and data, characteristics of amino acids and nucleic acids, information on radioactivity and the safe use of radioisotopes and other hazardous chemicals, conversions for centrifuges and rotors, characteristics of common detergents, and common ...
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AbstractThis appendix presents useful basic information, including common abbreviations, useful measurements and data, characteristics of amino acids and nucleic acids, information on radioactivity and the safe use of radioisotopes and other hazardous chemicals, conversions for centrifuges and rotors, characteristics of common detergents, and common ...
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Helicopter Main-Rotor/Tail-Rotor Interaction
Journal of the American Helicopter Society, 2000Preliminary results from a study to model the interaction aerodynamics and aeroacoustics of the main and tail rotor of a helicopter in subsonic flow are presented. The configurations studied are: 1) two bladed main and tail rotors in hover, and 2) a four-bladed main rotor and two-bladed tail rotor in climbing flight.
Yin, J., Ahmed, S.R.
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Reentry as an Origin for Rotors
Bulletin of Mathematical Biology, 2018The aim of the study is to understand in depth the meaning of "reentry", and to decipher if and how it can lead to malfunctions of the heart and possibly of the brain. A simple model is used to reveal the mechanism by which a single pulse of action potential rotating around a ring of excitable medium, the latter simulating a reentry circuit, can ...
Rabinovitch, A. +3 more
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Current Protocols in Protein Science, 1995
AbstractThis appendix provides rmax values (the maximum value of the rotating radius between the particle being centrifuged and the axis of rotation) for commonly used rotors manufactured by Du Pont (Sorvall), Beckman, Fisher, and IEC. Additionally, nomograms are provided for determining the relative centrifugal force (RCF) where speed and rmax are ...
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AbstractThis appendix provides rmax values (the maximum value of the rotating radius between the particle being centrifuged and the axis of rotation) for commonly used rotors manufactured by Du Pont (Sorvall), Beckman, Fisher, and IEC. Additionally, nomograms are provided for determining the relative centrifugal force (RCF) where speed and rmax are ...
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On the Vibration of Rotor With Rotor/Stopper Rubbing
Volume 7A: 17th Biennial Conference on Mechanical Vibration and Noise, 1999Abstract The vibration of a flywheel rotor with rotor/stopper rubbing is investigated by experimental methods. In the experiments, the large amplitude of the rotor vibration is excited by the electromagnetic harmonic excitation force and thus causes the rubbing between the rotor and the stopper.
Xingjian Dai +2 more
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The Safety Rotor—An Electromechanical Rotor Safety System for Drones
IEEE Robotics and Automation Letters, 2018We propose a novel rotor safety mechanism for rotary-wing small unmanned aerial vehicles, such as quadrotors, that avoids problems associated with cages, rotor shrouds, and obstacle avoidance safety systems. The system works by using a passively spinning hoop as a mechanical interference sensor; changes in hoop speed are detected with a reflective IR ...
Paul E. I. Pounds, Will Deer
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Entry Technology Conference, 1964
Autorotating rotors can, in a single configuration system, provide the capability for retardation, stabilization, drag force modulation, glide at useful L/D ratios, maneuvering and control during descent, and low-velocity touchdown. A given configuration will deploy over a wide range of speeds and dynamic pressures.
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Autorotating rotors can, in a single configuration system, provide the capability for retardation, stabilization, drag force modulation, glide at useful L/D ratios, maneuvering and control during descent, and low-velocity touchdown. A given configuration will deploy over a wide range of speeds and dynamic pressures.
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Effects of rotor–rotor interaction for a small tandem rotor operating in a crosswind
Physics of FluidsThis study investigates the effects of rotor–rotor interaction on the wake and thrust characteristics of a small tandem rotor operating in a crosswind. Flow velocity and force measurements were conducted in a wind tunnel with two rotors arranged parallel to a crosswind. The results show that the rotor–rotor interaction significantly influences the wake
Seokbong Chae +4 more
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Rotation–libration and rotor–rotor coupling in 4-methylpyridine
The Journal of Chemical Physics, 2004The low temperature rotational dynamics of methyl groups in 4-methylpyridine is analyzed in terms of a model potential including rotation–libration and rotor–rotor coupling. The parameters of the model potential are adjusted by comparison of calculated with published and newly recorded inelastic neutron scattering spectra.
M A, Neumann +3 more
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