1,335 research outputs found
Transmission and Reflection of Collective Modes in Spin-1 Bose-Einstein Condensate
We study tunneling properties of collective excitations in spin-1
Bose-Einstein condensates. In the absence of magnetic fields, the total
transmission in the long wavelength limit occurs in all kinds of excitations
but the quadrupolar spin mode in the ferromagnetic state. The quadrupolar spin
mode alone shows the total reflection. A difference between those excitations
comes from whether the wavefunction of an excitation corresponds to that of the
condensate in the long wavelength limit. The correspondence results in the
total transmission as in the spinless BEC.Comment: 6 pages, 5 figure
Identification des deux espèces jumelles Beryx mollis Abe 1959 et B. splendens Lowe 1834, à l'aide de caractères morphologiques et méristiques simples : rapport d'opération ZoNéCo
ELISA: a cryocooled 10 GHz oscillator with 10-15 frequency stability
This article reports the design, the breadboarding and the validation of an
ultra-stable Cryogenic Sapphire Oscillator operated in an autonomous
cryocooler. The objective of this project was to demonstrate the feasibility of
a frequency stability of 3x10-15 between 1 s and 1,000 s for the European Space
Agency deep space stations. This represents the lowest fractional frequency
instability ever achieved with cryocoolers. The preliminary results presented
in this paper validate the design we adopted for the sapphire resonator, the
cold source and the oscillator loop.Comment: 13 pages, 10 figure
Measurement of Free Fraction in Plasma for Biomathematical Prediction of SUVR of Amyloid PET Radiotracers
Absence of Anomalous Tunneling of Bogoliubov Excitations for Arbitrary Potential Barrier under the Critical Condensate Current
We derive the exact solution of low energy limit of Bogoliubov equations for
excitations of Bose-Einstein condensate in the presence of arbitrary potential
barrier and maximum current of condensate. Using this solution, we give the
explicit expression for the transmission coefficient against the potential
barrier, which shows partial transmission in the low energy limit. The
wavefunctions of excitations in the low energy limit do not coincide with that
of the condensate. The absence of the perfect transmission in the critical
current state originates from local enhancement of density fluctuations around
the potential barrier.Comment: 4 pages, 1 figur
Radiation Absorbed Dose Estimation of 2-[F-18]Fluoro-2-Deoxy-D-Glucose Using Whole Body PET and Measured Organ Volume MRI
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