3,114 research outputs found
Cranked Hartree-Fock-Bogoliubov Calculation for Rotating Bose-Einstein Condensates
A rotating bosonic many-body system in a harmonic trap is studied with the
3D-Cranked Hartree-Fock-Bogoliubov method at zero temperature, which has been
applied to nuclear many-body systems at high spin. This method is a variational
method extended from the Hartree-Fock theory, which can treat the pairing
correlations in a self-consistent manner. An advantage of this method is that a
finite-range interaction between constituent particles can be used in the
calculation, unlike the original Gross-Pitaevskii approach. To demonstrate the
validity of our method, we present a calculation for a toy model, that is, a
rotating system of ten bosonic particles interacting through the repulsive
quadrupole-quadrupole interaction in a harmonic trap. It is found that the
yrast states, the lowest-energy states for the given total angular momentum,
does not correspond to the Bose-Einstein condensate, except a few special
cases. One of such cases is a vortex state, which appears when the total
angular momentum is twice the particle number (i.e., ).Comment: accepted to Phys. Rev.
Robust Charge-based Qubit Encoding
We propose a simple encoding of charge-based quantum dot qubits which
protects against fluctuating electric fields by charge symmetry. We analyse the
reduction of coupling to noise due to nearby charge traps and present single
qubit gates. The relative advantage of the encoding increases with lower charge
trap density.Comment: 6 Pages, 7 Figures. Published Versio
Studies of electron temperature fluctuations in the core of Alcator C-Mod plasmas via correlation electron cyclotron emission
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2013.Cataloged from PDF version of thesis.Includes bibliographical references (pages 55-56).Transport in tokamak plasmas is higher than predicted by neoclassical theory; this anomalous transport is believed to be attributed to turbulent fluctuations. New Correlation Electron Cyclotron Emission (CECE) experiments on Alcator C-Mod show lower levels of electron temperature fluctuations in the saturated ohmic confinement (SOC) regime than in the linear ohmic confinement (LOC) regime, however the lineaveraged density fluctuation data collected from ohmic plasmas previously showed the opposite trends. The apparent contradiction is explained by a change in the dominant turbulence modes in each confinement regime. Linear stability analysis shows that the LOC regime is dominated by trapped electron mode (TEM) turbulence and the SOC regime is on the border between the ion temperature gradient (ITG) and TEM turbulence modes being dominant. It is reasonable to believe that the TEM turbulence mode drives electron temperature fluctuations, which explains the higher electron temperature fluctuation levels seen in the LOC regime compared to the SOC regime.by Curran Y. M. Oi.S.B
Superdeformation in Asymmetric NZ Nucleus Ar
A rotational band with five -ray transitions ranging from 2 to
12 states was identified in Ar. This band is linked through
transitions from the excited 2, 4 and 6 levels to
the low-lying states; this determines the excitation energy and the spin-parity
of the band. The deduced transition quadrupole moment of 1.45 indicates that the band has a superdeformed shape. The nature of the band
is revealed by cranked Hartree--Fock--Bogoliubov calculations and a
multiparticle--multihole configuration is assigned to the band
Physicochemical and sensory analysis of instant cereal beverage incorporated with corncob powder
The primary objectives of this study were to process corncob into corncob powder (CCP) and to apply CCP in the formulation of instant cereal beverage (ICB) in order to produce high fibre ICB, and to investigate the physicochemical and sensory properties of the corncob-based instant cereal beverage. Corncobs were sourced and washed thoroughly before drying and grinding into CCP. CCP was then imparted into ICB formulation in three different ratios (10, 20 and 30% w/w) to partially substitute corn flour in the formulation. All four ICB samples including the commercial counterpart were analysed for their physicochemical and sensory properties. The incorporation of CCP has affected the viscosity, colour and sensory attributes significantly of the produced ICB. Higher contents of CCP in the formulation was found to be responsible for less viscous and browner effect compared to the commercial ICB samples. Formulation of ICB incorporated with 30% w/w CCP had the highest mean scores (6.00, p<0.05) of overall acceptability among all the other formulations and it was comparable to the commercial ICB in the current market
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