Added Mass of an Oscillating Hemisphere at Very-Low and Very-High Frequencies
نویسندگان
چکیده
منابع مشابه
Black phosphorus nanoelectromechanical resonators vibrating at very high frequencies.
We report on the experimental demonstration of a new type of nanoelectromechanical resonator based on black phosphorus crystals. Facilitated by a highly efficient dry transfer technique, crystalline black phosphorus flakes are harnessed to enable drumhead resonators vibrating at high and very high frequencies (HF and VHF bands, up to ∼100 MHz). We investigate the resonant vibrational responses ...
متن کاملExperiments on a high quality grid oscillating in isotopically pure superfluid 4He at very low temperatures
We have investigated a copper-mesh grid oscillating at its fundamental (0,1) Bessel mode in isotopically pure superfluid He for temperatures 10 < T < 1500mK at a pressure of P = 5 bar. The high quality factor (Q ∼ 10) of the oscillator allowed us to observe new features of its response to a periodic drive which, at the lowest T , was found to depend on the prehistory of the helium. The experime...
متن کاملAccurate masses of very low mass stars : II The very low mass triple system Gl 866 ⋆
ASTRONOMY AND ASTROPHYSICS Accurate masses of very low mass stars: II The very low mass triple system Gl 866 Abstract. We present very accurate orbital parameters and mass measurements (2.4% accuracy) for the well known very low mass triple system Gl 866. We obtain first orbital elements for the short-period orbit and greatly improve the long period orbit. All three stars have masses close to 0...
متن کاملHigh-resolution Spectra of Very Low-Mass Stars
We present the results of high-resolution (1-0.4 Å) optical spectroscopy of a sample of very low-mass stars. These data are used to examine the kinematics of the stars at the bottom of the hydrogen-burning main sequence. No evidence is found for a significant difference between the kinematics of the stars in our sample with I–K > 3.5 (MBol ∼ 12.8) and those of more massive M-dwarfs (MBol ≈ 7 − ...
متن کاملMass loss of rotating stars at very low metallicity
Some indirect observations, as the high fraction of Be stars†at low metallicity, or the necessity for massive stars to be important sources of primary nitrogen, seem to indicate that very metal poor stars were fast rotators. As a consequence of this fast rotation, these stars, contrarily to current wisdom, might lose large amounts of mass during their lifetime. In this paper, we review various ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Fluids Engineering
سال: 2004
ISSN: 0098-2202,1528-901X
DOI: 10.1115/1.1839932