487 research outputs found
A study of the correlations between jet quenching observables at RHIC
Focusing on four types of correlation plots, vs. , vs. , vs. and vs.\
, we demonstrate how the centrality dependence of
\emph{correlations} between multiple jet quenching observables provide valuable
insight into the energy loss mechanism in a quark-gluon plasma. In particular
we find that a qualitative energy loss model gives a good description of
vs.\ only when we take and a medium
geometry generated by a model of the Color Glass Condensate. This same model also qualitatively describes the trigger dependence of
vs.\ data and makes novel predictions for the
centrality dependence for this vs.\ correlation.
Current data suggests, albeit with extremely large uncertainty, that
, a correlation that is difficult to reproduce in
current energy loss models.Comment: 6 pages, 6 figure
Multi-Agent Robust Control Synthesis from Global Temporal Logic Tasks
This paper focuses on the heterogeneous multi-agent control problem under
global temporal logic tasks. We define a specification language, called
extended capacity temporal logic (ECaTL), to describe the required global
tasks, including the number of times that a local or coupled signal temporal
logic (STL) task needs to be satisfied and the synchronous requirements on task
satisfaction. The robustness measure for ECaTL is formally designed. In
particular, the robustness for synchronous tasks is evaluated from both the
temporal and spatial perspectives. Mixed-integer linear constraints are
designed to encode ECaTL specifications, and a two-step optimization framework
is further proposed to realize task-satisfied motion planning with high spatial
robustness and synchronicity. Simulations are conducted to demonstrate the
expressivity of ECaTL and the efficiency of the proposed control synthesis
approach.Comment: 7 pages, 3 figure
Co3O4@CoS core-shell nanosheets on carbon cloth for high performance supercapacitor electrodes
In this work, a two-step electrodeposition strategy is developed for the synthesis of core-shell Co3O4@CoS nanosheet arrays on carbon cloth (CC) for supercapacitor applications. Porous Co3O4 nanosheet arrays are first directly grown on CC by electrodeposition, followed by the coating of a thin layer of CoS on the surface of Co3O4 nanosheets via the secondary electrodeposition. The morphology control of the ternary composites can be easily achieved by altering the number of cyclic voltammetry (CV) cycles of CoS deposition. Electrochemical performance of the composite electrodes was evaluated by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy techniques. The results demonstrate that the Co3O4@CoS/CC with 4 CV cycles of CoS deposition possesses the largest specific capacitance 887.5 F·g-1 at a scan rate of 10 mV·s-1 (764.2 F·g-1 at a current density of 1.0 A·g-1), and excellent cycling stability (78.1% capacitance retention) at high current density of 5.0 A·g-1 after 5000 cycles. The porous nanostructures on CC not only provide large accessible surface area for fast ions diffusion, electron transport and efficient utilization of active CoS and Co3O4, but also reduce the internal resistance of electrodes, which leads to superior electrochemical performance of Co3O4@CoS/CC composite at 4 cycles of CoS deposition. © 2017 by the authors.National Natural Science Foundation of China [21371057]; International Science and Technology Cooperation Program of China [2016YFE0131200, 2015DFA51220]; International Cooperation Project of Shanghai Municipal Science and Technology Committee [15520721100
Advances in the study of B cells in renal ischemia-reperfusion injury
Renal ischemia-reperfusion injury (IRI) is a non-negligible clinical challenge for clinicians in surgeries such as renal transplantation. Functional loss of renal tubular epithelial cell (TEC) in IRI leads to the development of acute kidney injury, delayed graft function (DGF), and allograft rejection. The available evidence indicates that cellular oxidative stress, cell death, microvascular dysfunction, and immune response play an important role in the pathogenesis of IRI. A variety of immune cells, including macrophages and T cells, are actively involved in the progression of IRI in the immune response. The role of B cells in IRI has been relatively less studied, but there is a growing body of evidence for the involvement of B cells, which involve in the development of IRI through innate immune responses, adaptive immune responses, and negative immune regulation. Therefore, therapies targeting B cells may be a potential direction to mitigate IRI. In this review, we summarize the current state of research on the role of B cells in IRI, explore the potential effects of different B cell subsets in the pathogenesis of IRI, and discuss possible targets of B cells for therapeutic aim in renal IRI
Observation of Chern insulator in crystalline ABCA-tetralayer graphene with spin-orbit coupling
Degeneracies in multilayer graphene, including spin, valley, and layer
degrees of freedom, are susceptible to Coulomb interactions and can result into
rich broken-symmetry states. In this work, we report a ferromagnetic state in
charge neutral ABCA-tetralayer graphene driven by proximity-induced spin-orbit
coupling from adjacent WSe2. The ferromagnetic state is further identified as a
Chern insulator with Chern number of 4, and its Hall resistance reaches 78% and
100% quantization of h/4e2 at zero and 0.4 tesla, respectively. Three
broken-symmetry insulating states, layer-antiferromagnet, Chern insulator and
layer-polarized insulator and their transitions can be continuously tuned by
the vertical displacement field. Remarkably, the magnetic order of the Chern
insulator can be switched by three knobs, including magnetic field, electrical
doping, and vertical displacement field
Jet Tomography of Harmonic Fluctuations in the Initial Condition of Heavy Ion Collisions
In this paper we study the jet response (particularly azimuthal anisotropy)
as a hard probe of the harmonic fluctuations in the initial condition of
central heavy ion collisions. By implementing the fluctuations via cumulant
expansion for various harmonics quantified by and using the
geometric model for jet energy loss, we compute the response
. Combining these results with the known hydrodynamic
response of the bulk matter expansion in the literature, we show that the
hard-soft azimuthal correlation arising from their respective responses to the
common geometric fluctuations reveals a robust and narrow near-side peak that
may provide the dominant contribution to the "hard-ridge" observed in
experimental data.Comment: 7 pages, 3 figures; important updates for figures and table in
version 2; some references adde
Stepwise Feature Fusion: Local Guides Global
Colonoscopy, currently the most efficient and recognized colon polyp detection technology, is necessary for early screening and prevention of colorectal cancer. However, due to the varying size and complex morphological features of colonic polyps as well as the indistinct boundary between polyps and mucosa, accurate segmentation of polyps is still challenging. Deep learning has become popular for accurate polyp segmentation tasks with excellent results. However, due to the structure of polyps image and the varying shapes of polyps, it is easy for existing deep learning models to overfit the current dataset. As a result, the model may not process unseen colonoscopy data. To address this, we propose a new state-of-the-art model for medical image segmentation, the SSFormer, which uses a pyramid Transformer encoder to improve the generalization ability of models. Specifically, our proposed Progressive Locality Decoder can be adapted to the pyramid Transformer backbone to emphasize local features and restrict attention dispersion. The SSFormer achieves state-of-the-art performance in both learning and generalization assessment
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