7,827 research outputs found
Phase control of spatial interference from two duplicated two-level atoms
We report the phase control of spatial interference of resonance fluorescence
from two duplicated two-level atoms, driving by two orthogonally polarized
fields. In this closed-loop system, the relative phase is of crucial importance
to the recovery of the interference patten in the fluorescence light even with
strong driving.In order to improve the experimental realizability, we propose a
scheme to recover the visibility with fixed relative phase by adjusting the
relative intensities between the two driving fields or alternatively by using a
standing-wave field.Comment: 5 pages, 3 figure
The paradox of green credit in China
AbstractThe green credit policy has made remarkable achievements in energy saving, emission reduction and industrial structure optimization, however, due to the collusion between enterprises and local government, a huge gap exists between the reality and expectation in the process of policy execution. The collusion is the result of cooperative game through Nash bargaining. Banks, as agents in carrying out the green credit policy, offer preferential interest rate that influences the collusion. This paper analyzes the collusion and factors affecting its incidence on the bas is of constructing the expected profit functions of both the enterprise and the local government. Meanwhile, we obtain the optimal volume of loans and offer several relevant suggestions for policy
Dietary supplementation of L-carnitine relieved detrimental impacts of a high-fat diet in juvenile Trachinotus ovatus
In recent years, the dramatically high lipid level has been used in fish feeds, resulting in low survival rates of fish and huge economic losses. Based on these issues, a six-week feeding experiment was conducted to investigate whether diet supplements with L-carnitine can be used to relieve detrimental impacts on growth performance, hepatic lipid accumulation, antioxidant, anti-inflammatory and non-specific immune status, as well as intestinal morphology of Trachinotus ovatus, fed on a high-fat diet. Three isonitrogenous diets were formulated to either include or exclude high-fat and L-carnitine (lipid positive (LP): 130 g kg−1 lipid, lipid negative (LN): 210 g kg−1 lipid, lipid negative with L-carnitine (LNC): 210 g kg−1 lipid with 0.6 g kg−1 L-carnitine). Results indicated that the growth performance and mid-intestine villi length of T. ovatus in the LN group were significantly lower than that of the LP group (p 0.05) and significantly higher levels in the LNC group (p 0.05). In conclusion, L-carnitine can relieve the detrimental impact on growth performance of T. ovatus exposed to a high-fat diet treatment by reducing hepatic lipid accumulation and improving intestinal morphology, anti-inflammatory and non-specific immune status, but could not mitigate oxidative pressure.publishedVersio
Exploiting Device-to-Device Communications to Enhance Spatial Reuse for Popular Content Downloading in Directional mmWave Small Cells
With the explosive growth of mobile demand, small cells in millimeter wave
(mmWave) bands underlying the macrocell networks have attracted intense
interest from both academia and industry. MmWave communications in the 60 GHz
band are able to utilize the huge unlicensed bandwidth to provide multiple Gbps
transmission rates. In this case, device-to-device (D2D) communications in
mmWave bands should be fully exploited due to no interference with the
macrocell networks and higher achievable transmission rates. In addition, due
to less interference by directional transmission, multiple links including D2D
links can be scheduled for concurrent transmissions (spatial reuse). With the
popularity of content-based mobile applications, popular content downloading in
the small cells needs to be optimized to improve network performance and
enhance user experience. In this paper, we develop an efficient scheduling
scheme for popular content downloading in mmWave small cells, termed PCDS
(popular content downloading scheduling), where both D2D communications in
close proximity and concurrent transmissions are exploited to improve
transmission efficiency. In PCDS, a transmission path selection algorithm is
designed to establish multi-hop transmission paths for users, aiming at better
utilization of D2D communications and concurrent transmissions. After
transmission path selection, a concurrent transmission scheduling algorithm is
designed to maximize the spatial reuse gain. Through extensive simulations
under various traffic patterns, we demonstrate PCDS achieves near-optimal
performance in terms of delay and throughput, and also superior performance
compared with other existing protocols, especially under heavy load.Comment: 12 pages, to appear in IEEE Transactions on Vehicular Technolog
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