Beihang University

About: Beihang University is a education organization based out in Beijing, China. It is known for research contribution in the topics: Computer science & Control theory. The organization has 67002 authors who have published 73507 publications receiving 975691 citations. The organization is also known as: Beijing University of Aeronautics and Astronautics.

Bidirectional Catalysts for Liquid–Solid Redox Conversion in Lithium–Sulfur Batteries

Abstract: Accelerated conversion by catalysis is a promising way to inhibit shuttling of soluble polysulfides in lithium-sulfur (Li-S) batteries, but most of the reported catalysts work only for one direction sulfur reaction (reduction or oxidation), which is still not a root solution since fast cycled use of sulfur species is not finally realized A bidirectional catalyst design, oxide-sulfide heterostructure, is proposed to accelerate both reduction of soluble polysulfides and oxidation of insoluble discharge products (eg, Li2 S), indicating a fundamental way for improving both the cycling stability and sulfur utilization Typically, a TiO2 -Ni3 S2 heterostructure is prepared by in situ growing TiO2 nanoparticles on Ni3 S2 surface and the intimately bonded interfaces are the key for bidirectional catalysis For reduction, TiO2 traps while Ni3 S2 catalytically converts polysulfides For oxidation, TiO2 and Ni3 S2 both show catalytic activity for Li2 S dissolution, refreshing the catalyst surface The produced sulfur cathode with TiO2 -Ni3 S2 delivers a low capacity decay of 0038% per cycle for 900 cycles at 05C and specially, with a sulfur loading of 39 mg cm-2 , achieves a high capacity retention of 65% over 500 cycles at 03C This work unlocks how a bidirectional catalyst works for boosting Li-S batteries approaching practical uses

Towards Fast, Accurate and Stable 3D Dense Face Alignment.

Abstract: Existing methods of 3D dthus limiting the scope of their practical applications. In this paper, we propose a novel regression framework which makes a balance among speed, accuracy and stability. Firstly, on the basis of a lightweight backbone, we propose a meta-joint optimization strategy to dynamically regress a small set of 3DMM parameters, which greatly enhances speed and accuracy simultaneously. To further improve the stability on videos, we present a virtual synthesis method to transform one still image to a short-video which incorporates in-plane and out-of-plane face moving. On the premise of high accuracy and stability, our model runs at 50 fps on a single CPU core and outperforms other state-of-the-art heavy models simultaneously. Experiments on several challenging datasets validate the efficiency of our method. The code and models will be available at https://github.com/cleardusk/3DDFA_V2.

Ternary Organic Solar Cells Based on Two Compatible Nonfullerene Acceptors with Power Conversion Efficiency >10%

Abstract: Two different nonfullerene acceptors and one copolymer are used to fabricate ternary organic solar cells (OSCs). The two acceptors show unique interactions that reduce crystallinity and form a homogeneous mixed phase in the blend film, leading to a high efficiency of ≈10.3%, the highest performance reported for nonfullerene ternary blends. This work provides a new approach to fabricate high-performance OSCs.