227 research outputs found
Insights from ARPES for an undoped, four-layered, two-gap high-T_c superconductor
An undoped cuprate with apical fluorine and inner (i) and outer (o)
CuO2-layers is a 60 K superconductor whose Fermi surface (FS) has large n- and
p-doped sheets with the SC gap on the n-sheet twice that on the p -sheet (Y.
Chen et al.). The Fermi surface is not reproduced by the LDA, but the screening
must be substantially reduced due to electronic correlations, and oxygen in the
o-layers must be allowed to dimple outwards. This charges the i-layers by
0.01|e|, causes an 0.4 eV Madelung-potential difference between the i and o
-layers, quenches the i-o hopping, and localizes the n-sheets onto the
i-layers, thus protecting their d-wave pairs from being broken by scattering on
impurities in the BaF layers. The correlation-reduced screening strengthens the
coupling to z-axis phonons.Comment: 4 pages, 3 figure
Cebranopadol, a Mixed Opioid Agonist, Reduces Cocaine Self-administration through Nociceptin Opioid and Mu Opioid Receptors
Cocaine addiction is a widespread psychiatric condition still waiting for approved efficacious medications. Previous studies suggested that simultaneous activation of nociceptin opioid (NOP) and mu opioid (MOP) receptors could be a successful strategy to treat cocaine addiction, but the paucity of molecules co-activating both receptors with comparable potency has hampered this line of research. Cebranopadol is a non-selective opioid agonist that at nanomolar concentration activates both NOP and MOP receptors and that recently reached phase-III clinical trials for cancer pain treatment. Here, we tested the effect of cebranopadol on cocaine self-administration (SA) in the rat. We found that under a fixed-ratio-5 schedule of reinforcement, cebranopadol (25 and 50 µg/kg) decreased cocaine but not saccharin SA, indicating a specific inhibition of psychostimulant consumption. In addition, cebranopadol (50 µg/kg) decreased the motivation for cocaine as detected by reduction of the break point measured in a progressive-ratio paradigm. Next, we found that cebranopadol retains its effect on cocaine consumption throughout a 7-day chronic treatment, suggesting a lack of tolerance development toward its effect. Finally, we found that only simultaneous blockade of NOP and MOP receptors by concomitant administration of the NOP antagonist SB-612111 (30 mg/kg) and naltrexone (2.5 mg/kg) reversed cebranopadol-induced decrease of cocaine SA, demonstrating that cebranopadol activates both NOP and classical opioid receptors to exert its effect. Our data, together with the fairly advanced clinical development of cebranopadol and its good tolerability profile in humans, indicate that cebranopadol is an appealing candidate for cocaine addiction treatment
Bulk Fermi surface coexistence with Dirac surface state in BiSe: a comparison of photoemission and Shubnikov-de Haas measurements
Shubnikov de Haas (SdH) oscillations and Angle Resolved PhotoEmission
Spectroscopy (ARPES) are used to probe the Fermi surface of single crystals of
Bi2Se3. We find that SdH and ARPES probes quantitatively agree on measurements
of the effective mass and bulk band dispersion. In high carrier density
samples, the two probes also agree in the exact position of the Fermi level EF,
but for lower carrier density samples discrepancies emerge in the position of
EF. In particular, SdH reveals a bulk three-dimensional Fermi surface for
samples with carrier densities as low as 10^17cm-3. We suggest a simple
mechanism to explain these differences and discuss consequences for existing
and future transport studies of topological insulators.Comment: 5 mages, 5 figure
Channel Cycle Time: A New Measure of Short-term Fairness
This paper puts forth a new metric, dubbed channel cycle time (CCT), to
measure the short-term fairness of communication networks. CCT characterizes
the average duration between two consecutive successful transmissions of a
user, during which all other users successfully accessed the channel at least
once. In contrast to existing short-term fairness measures, CCT provides more
comprehensive insight into the transient dynamics of communication networks,
with a particular focus on users' delays and jitter. To validate the efficacy
of our approach, we analytically characterize the CCTs for two classical
communication protocols: slotted Aloha and CSMA/CA. The analysis demonstrates
that CSMA/CA exhibits superior short-term fairness over slotted Aloha. Beyond
its role as a measurement metric, CCT has broader implications as a guiding
principle for the design of future communication networks by emphasizing
factors like fairness, delay, and jitter in short-term behaviors
Improved Consensus ADMM for Cooperative Motion Planning of Large-Scale Connected Autonomous Vehicles with Limited Communication
This paper investigates a cooperative motion planning problem for large-scale
connected autonomous vehicles (CAVs) under limited communications, which
addresses the challenges of high communication and computing resource
requirements. Our proposed methodology incorporates a parallel optimization
algorithm with improved consensus ADMM considering a more realistic locally
connected topology network, and time complexity of O(N) is achieved by
exploiting the sparsity in the dual update process. To further enhance the
computational efficiency, we employ a lightweight evolution strategy for the
dynamic connectivity graph of CAVs, and each sub-problem split from the
consensus ADMM only requires managing a small group of CAVs. The proposed
method implemented with the receding horizon scheme is validated thoroughly,
and comparisons with existing numerical solvers and approaches demonstrate the
efficiency of our proposed algorithm. Also, simulations on large-scale
cooperative driving tasks involving 80 vehicles are performed in the
high-fidelity CARLA simulator, which highlights the remarkable computational
efficiency, scalability, and effectiveness of our proposed development.
Demonstration videos are available at
https://henryhcliu.github.io/icadmm_cmp_carla.Comment: 15 pages, 10 figure
Identifying veraison process of colored wine grapes in field conditions combining deep learning and image analysis
Acknowledgments This work was supported by the National Key R&D Program Project of China (Grant No. 2019YFD1002500) and Guangxi Key R&D Program Project (Grant No. Gui Ke AB21076001) The authors would like to thank the anonymous reviewers for their helpful comments and suggestions.Peer reviewedPostprin
Development of a mobile application for identification of grapevine (Vitis vinifera L.) cultivars via deep learning
Acknowledgements: The authors would like to express their gratitude to the Teaching Experiment Farm of Ningxia University, for their kind help. This study was supported by the Key R & D projects of Ningxia Hui Autonomous Region (Grant No. 2019BBF02013)Peer reviewedPublisher PD
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