128 research outputs found
Spin Hall Conductivity and Anomalous Hall Conductivity in Full Heusler compounds
The spin Hall conductivity (SHC) and anomalous Hall conductivity (AHC) in
more than 120 full Heusler compounds are calculated using density functional
theory in a high-throughtput way. The electronic structures are mapped to the
Wannier basis and the linear response theory is used to get the conductivity.
Our results show that the mechanism under the SHC or AHC cannot be simply
related to the valence electron numbers or atomic weights, is related to the
very details of the electronic structure, which can only be obtained by
calculations. A high throughput calculation is efficient to screen out the
desired materials. According to our present results, Cu2CoSn, as well as
Co2MnAl and Co2MnGa are candidates in spintronic materials regarding to their
high SHC and AHC values, which can benefit the spin-torque-driven nanodevices
TRMM Microwave Imager (TMI) Updates for Final Data Version Release
The Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) dataset released by the Precipitation Processing System (PPS) will be updated to a final version within the next year. These updates are based on increased knowledge in recent years of radiometer calibration and sensor performance issues. In particular, the Global Precipitation Measurement (GPM) Microwave Imager (GMI) is used as a model for many of the TMI version updates. This paper discusses four aspects of the TMI data product that will be improved: spacecraft attitude, calibration and quality control, along-scan bias corrections, and sensor pointing accuracy. These updates will be incorporated into the final TMI data version, improving the quality of the data product and ensuring accurate geophysical parameters can be derived from TMI
BASIC STUDY FOR COAL MOISTURE CONTROL INTEGRATING PNEUMATIC CLASSIFICATION TECHNIQUE
A technique of coal moisture control integrating pneumatic classification with flue gas as heating medium was put forward. With this technique, refined coal moisture control can be realized accompanying classification in one process, and considerable high-quality energy can be saved in coking and milling procedure. In this paper, coal classification and moisture control behaviors was investigated at different conditions. Based on experimental results, the basic parameters for the technique were worked out accordingly
Shadow-Aware Dynamic Convolution for Shadow Removal
With a wide range of shadows in many collected images, shadow removal has
aroused increasing attention since uncontaminated images are of vital
importance for many downstream multimedia tasks. Current methods consider the
same convolution operations for both shadow and non-shadow regions while
ignoring the large gap between the color mappings for the shadow region and the
non-shadow region, leading to poor quality of reconstructed images and a heavy
computation burden. To solve this problem, this paper introduces a novel
plug-and-play Shadow-Aware Dynamic Convolution (SADC) module to decouple the
interdependence between the shadow region and the non-shadow region. Inspired
by the fact that the color mapping of the non-shadow region is easier to learn,
our SADC processes the non-shadow region with a lightweight convolution module
in a computationally cheap manner and recovers the shadow region with a more
complicated convolution module to ensure the quality of image reconstruction.
Given that the non-shadow region often contains more background color
information, we further develop a novel intra-convolution distillation loss to
strengthen the information flow from the non-shadow region to the shadow
region. Extensive experiments on the ISTD and SRD datasets show our method
achieves better performance in shadow removal over many state-of-the-arts. Our
code is available at https://github.com/xuyimin0926/SADC
Complementary stabilization by core/sheath carbon nanofibers/spongy carbon on submicron tin oxide particles as anode for lithium-ion batteries
To limit the pulverization of tin-based anode materials during lithiation/delithiation, submicron tin oxide/tin particles are fixed on core/sheath carbon nanofiber/spongy carbon via hydrothermal and carbothermal reduction treatment in this work. During carbothermal reduction, SnO2 nanosheets are converted to spherical Sn submicron particles and simultaneously the hollow spongy carbon is produced and still enwrap on carbon nanofiber. The as-produced flexible film is used for a binder-free anode for lithium ion batteries, without the polymer binder and conductive carbon. At 0.1, 0.5, 1 and 2 A g-1, the composite electrode respectively displays a discharging capacity of 1393.0, 738.2, 583.6 and 382.6 mAh g-1. Moreover, it delivers specific capacity of 726.9 mAh g-1 and coulombic efficiency of 99.45 % after 300 cycles at 0.1 A g-1. The comparison sample of carbon nanofiber/SnOx film without the presence of spongy carbon displays much lower rate performance and worse cyclic performance. The integrated structure of carbon nanofiber/SnOx/spongy carbon results in the remarkable Li-storage performance, in which the carbon nanofiber and spongy carbon synergistically provide conductive channel and buffer zone to hinder the pulverization and peeling of SnOx particles during charging-discharging processes
Plasmon-enhanced Stimulated Raman Scattering Microscopy with Single-molecule Detection Sensitivity
Stimulated Raman scattering (SRS) microscopy allows for high-speed label-free
chemical imaging of biomedical systems. The imaging sensitivity of SRS
microscopy is limited to ~10 mM for endogenous biomolecules. Electronic
pre-resonant SRS allows detection of sub-micromolar chromophores. However,
label-free SRS detection of single biomolecules having extremely small Raman
cross-sections (~10-30 cm2 sr-1) remains unreachable. Here, we demonstrate
plasmon-enhanced stimulated Raman scattering (PESRS) microscopy with
single-molecule detection sensitivity. Incorporating pico-Joule laser
excitation, background subtraction, and a denoising algorithm, we obtained
robust single-pixel SRS spectra exhibiting the statistics of single-molecule
events. Single-molecule detection was verified by using two isotopologues of
adenine. We further demonstrated the capability of applying PESRS for
biological applications and utilized PESRS to map adenine released from
bacteria due to starvation stress. PESRS microscopy holds the promise for
ultrasensitive detection of molecular events in chemical and biomedical
systems
Insight into the synthesis of alcohols and acids in plasma-driven conversion of CO2 and CH4 over copper-based catalysts
Enhanced protective immunity of the chimeric vector-based vaccine rAdV-SFV-E2 against classical swine fever in pigs by a Salmonella bacterial ghost adjuvant
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