5,470 research outputs found
Understanding finite size effects in quasi-long-range orders for exactly solvable chain models
In this paper, we investigate how much of the numerical artefacts introduced
by finite system size and choice of boundary conditions can be removed by
finite size scaling, for strongly-correlated systems with quasi-long-range
order. Starting from the exact ground-state wave functions of hardcore bosons
and spinless fermions with infinite nearest-neighbor repulsion on finite
periodic chains and finite open chains, we compute the two-point,
density-density, and pair-pair correlation functions, and fit these to various
asymptotic power laws. Comparing the finite-periodic-chain and finite-openchain
correlations with their infinite-chain counterparts, we find reasonable
agreement among them for the power-law amplitudes and exponents, but poor
agreement for the phase shifts. More importantly, for chain lengths on the
order of 100, we find our finite-open-chain calculation overestimates some
infinite-chain exponents (as did a recent density-matrix renormalization-group
(DMRG) calculation on finite smooth chains), whereas our finite-periodic-chain
calculation underestimates these exponents. We attribute this systematic
difference to the different choice of boundary conditions. Eventually, both
finite-chain exponents approach the infinite-chain limit: by a chain length of
1000 for periodic chains, and > 2000 for open chains. There is, howwever, a
misleading apparent finite size scaling convergence at shorter chain lengths,
for both our finite-chain exponents, as well as the finite-smooth-chain
exponents. Implications of this observation are discussed.Comment: 14 pages, 15 figure
Regional disparity and convergence of electricity consumption in China: A distribution dynamics approach
© 2018 Elsevier Inc. One critical factor that affects China's achievement of its peak emission by 2030 is total electricity demand. The aim of this study is to examine regional disparity in electricity consumption in China. The analysis is based on a panel database which is compiled at the provincial level. A distributional dynamics approach is then employed to reveal the trend and movement of each province within the distributions in different regional groupings. The mobility probability plot (MPP) is also employed to provide detailed information on the probability of change in electricity consumption. The results demonstrate significant divergence presents across provinces, over time and within different regional groups. The results can pinpoint the transition mechanism within each region so that appropriate energy policy can be formulated to accommodate future demand in electricity for different regions in China. The results suggest that regional specific energy efficiency policy is needed
Effect of emulsification method and particle size on the rate of in vivo oral bioavailability of kenaf (Hibiscus Cannabinus L.) seed oil
Kenaf (Hibiscus cannabinus L.) seed oil-in-water nanoemulsions stabilized by complexation of beta-cyclodextrin with sodium caseinate and Tween 20 have been shown to have higher bioaccessibility of vitamin E and total phenolic content than nonemulsified kenaf seed oil in the previous in vitro gastrointestinal digestion study. However, its oral bioavailability was unknown. Therefore, the aim of this study was to evaluate the rate of in vivo oral bioavailability of kenaf seed oil-in-water nanoemulsions in comparison with nonemulsified kenaf seed oil and kenaf seed oil macroemulsions during the 180 min of gastrointestinal digestion. Kenaf seed oil macroemulsions were produced by using conventional method. Kenaf seed oil-in-water nanoemulsions had shown improvement in the rate of absorption. At 180 min of digestion time, the total α-tocopherol bioavailability of kenaf seed oil nanoemulsions was increased by 1.7- and 1.4-fold, compared to kenaf seed oil and macroemulsion, respectively. Kenaf seed oil-in-water nanoemulsions were stable in considerably wide range of pH (>5 and <3), suggesting that it can be fortified into beverages within this pH range PRACTICAL APPLICATION: The production of kenaf seed oil-in-water nanoemulsions had provided a delivery system to encapsulate the kenaf seed oil, as well as enhanced the bioaccessibility and bioavailability of kenaf seed oil. Therefore, kenaf seed oil-in-water nanoemulsions exhibit a great potential application in nutraceutical fields
Determining the physical conditions of extremely young Class 0 circumbinary disk around VLA1623A
We present detailed analysis of high-resolution C18O (2-1), SO (88-77), CO
(3-2) and DCO+ (3-2) data obtained by the Atacama Large
Millimeter/sub-millimeter Array (ALMA) towards a Class 0 Keplerian circumbinary
disk around VLA1623A, which represents one of the most complete analysis
towards a Class 0 source. From the dendrogram analysis, we identified several
accretion flows feeding the circumbinary disk in a highly anisotropic manner.
Stream-like SO emission around the circumbinary disk reveals the complicated
shocks caused by the interactions between the disk, accretion flows and
outflows. A wall-like structure is discovered south of VLA1623B. The discovery
of two outflow cavity walls at the same position traveling at different
velocities suggests the two outflows from both VLA1623A and VLA1623B overlays
on top of each other in the plane of sky. Our detailed flat and flared disk
modeling shows that Cycle 2 C18O J = 2-1 data is inconsistent with the combined
binary mass of 0.2 Msun as suggested by early Cycle 0 studies. The combined
binary mass for VLA1623A should be modified to 0.3 ~ 0.5 Msun.Comment: 26 pages, 20 figures, accepted by ApJ 2020.2.2
- …