3,770 research outputs found
Half Metallic Bilayer Graphene
Charge neutral bilayer graphene has a gapped ground state as transport
experiments demonstrate. One of the plausible such ground states is layered
antiferromagnetic spin density wave (LAF) state, where the spins in top and
bottom layers have same magnitude with opposite directions. We propose that
lightly charged bilayer graphene in an electric field perpendicular to the
graphene plane may be a half metal as a consequence of the inversion and
particle-hole symmetry broken in the LAF state. We show this explicitly by
using a mean field theory on a 2-layer Hubbard model for the bilayer graphene.Comment: 4+ pages, 4 figure
Insights into battles between Mycobacterium tuberculosis and macrophages
As the first line of immune defense for Mycobacterium tuberculosis (Mtb), macrophages also provide a major habitat for Mtb to reside in the host for years. The battles between Mtb and macrophages have been constant since ancient times. Triggered upon Mtb infection, multiple cellular pathways in macrophages are activated to initiate a tailored immune response toward the invading pathogen and regulate the cellular fates of the host as well. Toll-like receptors (TLRs) expressed on macrophages can recognize pathogen-associated-molecular patterns (PAMPs) on Mtb and mediate the production of immune-regulatory cytokines such as tumor necrosis factor (TNF) and type I Interferons (IFNs). In addition, Vitamin D receptor (VDR) and Vitamin D-1-hydroxylase are up-regulated in Mtb-infected macrophages, by which Vitamin D participates in innate immune responses. The signaling pathways that involve TNF, type I IFNs and Vitamin D are inter-connected, which play critical roles in the regulation of necroptosis, apoptosis, and autophagy of the infected macrophages. This review article summarizes current knowledge about the interactions between Mtb and macrophages, focusing on cellular fates of the Mtb-infected macrophages and the regulatory molecules and cellular pathways involved in those processes
5-Methyl-1,2,3,3a-tetraÂhydroÂbenzo[e]pyrroloÂ[2,1-b][1,3]oxazepin-10(5H)-one
The asymmetric unit of the title compound, C13H15NO2, the main product of a photoreaction, contains two crystallographically independent molÂecules. In both molÂecules, the conformation of the seven-membered ring is twist sofa and that of the five-membered rings is envelope. In the crystal, molÂecules are linked by weak interÂmolecular C—H⋯O hydrogen bonds
Exploiting Diverse Characteristics and Adversarial Ambivalence for Domain Adaptive Segmentation
Adapting semantic segmentation models to new domains is an important but
challenging problem. Recently enlightening progress has been made, but the
performance of existing methods are unsatisfactory on real datasets where the
new target domain comprises of heterogeneous sub-domains (e.g., diverse weather
characteristics). We point out that carefully reasoning about the multiple
modalities in the target domain can improve the robustness of adaptation
models. To this end, we propose a condition-guided adaptation framework that is
empowered by a special attentive progressive adversarial training (APAT)
mechanism and a novel self-training policy. The APAT strategy progressively
performs condition-specific alignment and attentive global feature matching.
The new self-training scheme exploits the adversarial ambivalences of easy and
hard adaptation regions and the correlations among target sub-domains
effectively. We evaluate our method (DCAA) on various adaptation scenarios
where the target images vary in weather conditions. The comparisons against
baselines and the state-of-the-art approaches demonstrate the superiority of
DCAA over the competitors.Comment: Accepted to AAAI 202
Localized States and Quantum Spin Hall Effect in Si-Doped InAs/GaSb Quantum Wells
We study localized in-gap states and quantum spin Hall effect in Si-doped
InAs/GaSb quantum wells. We propose a model describing donor and/or acceptor
impurities to describe Si dopants. This model shows in-gap bound states and
wide conductance plateau with the quantized value in light dopant
concentration, consistent with recent experiments by Du et al. We predict a
conductance dip structure due to backward scattering in the region where the
localization length is comparable with the sample width but much
smaller than the sample length .Comment: 4+pages main text including 4 figures, supplementary materials with 3
figures are include
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