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1. chinaXiv:201912.00026 [pdf]

Spotting Macro- and Micro-expression Intervals in Long Video Sequences

Ying He; Su-Jing Wang; Jingting Li; Moi Hoon Yap
Subjects: Psychology >> Cognitive Psychology

This paper presents baseline results for the Third Facial Micro-Expression Grand Challenge (MEGC 2020). Both macro- and micro-expression intervals in CAS(ME)^2 and SAMM Long Videos are spotted by employing the method of Main Directional Maximal Difference Analysis (MDMD). The MDMD method uses the magnitude maximal difference in the main direction of optical flow features to spot facial movements. The single frame prediction results of the original MDMD method are post processed into reasonable video intervals. The metric F1-scores of baseline results are evaluated: for CAS(ME)^2, the F1-scores are 0.1196 and 0.0082 for macro- and micro-expressions respectively, and the overall F1-score is 0.0376; for SAMM Long Videos, the F1-scores are 0.0629 and 0.0364 for macro- and micro-expressions respectively, and the overall F1-score is 0.0445. The baseline project codes is publicly available at https://github.com/HeyingGithub/Baseline-project-for-MEGC2020_spotting.

submitted time 2019-12-20 Hits12710Downloads1159 Comment 0

2. chinaXiv:201810.00002 [pdf]

多相单原子催化剂:一种新型的人工酶

Chao, Zhao; Can, Xiong; Man, Qiao; Tongwei, Yuan; Jing, Wang; Yunteng, Qu; XiaoQian, Wang; Fangyao, Zhou; Zhijun, Li; Qian, Xu; Shiqi, Wang; Min, Chen; Wenyu, Wang; Yafei, Li; Yuen, Wu; Yadong, Li
Subjects: Chemistry >> Inorganic Chemistry

在这里,我们报告了一种高温气体迁移策略来制备多相的单原子铁催化剂,并展示其优良的类天然酶的活性(定义为单原子酶,SAE)。 结果表明,Fe SAE的局部定义明确的FeN4位点与含血红素的天然酶的活性金属中心高度相似。 Fe SAE表现出超级高的类过氧化物酶,氧化酶和过氧化氢酶的活性,超过了Fe3O4纳米酶40倍。更重要的是,Fe SAE可以有效活化过氧化氢(H2O2)产生羟基自由基(?OH)。 这使得其可以作为一种多相化的类Fenton系统,可以应对不断增加的环境污染。 我们的研究结果开辟了一个新的人造材料家族-模仿天然

submitted time 2018-10-04 Hits3564Downloads1781 Comment 0

3. chinaXiv:201711.02307 [pdf]

Study of linearity of LYSO crystal for HERD calorimeter

Zheng Quan; Zhi-gang Wang; Ming Xu; Yong-wei Dong; Jun-jing Wang; Guang-peng An; Xin Liu; Tian-wei Bao; Li Zhang; Rui-jie Wang; Jun-guang Lv; Bo-bing Wu; Shuang-nan Zhang
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

The High Energy cosmic Radiation Detection (HERD) facility is a space mission designed for detecting cosmic ray (CR) electrons, γ-rays up to tens of TeV and CR nuclei from proton to iron up to several PeV. The main instrument of HERD is a 3-D imaging calorimeter (CALO) composed of nearly ten thousand cubic LYSO crystals. A large dynamic range of single HERD CALO Cell (HCC) is necessary to achieve HERD’s PeV observation objectives, which means that the response of HCC should maintain a good linearity from minimum ionizing particle (MIP) calibration to PeV shower maximum. In order to study the linearity of HCC over such a large energy range, a beam test has been implemented at the E2 and E3 beam lines of BEPC. High intensity pulsed electron beam provided by E2 line are used for producing high energy density within HCC; π+/proton provided by E3 line are used for HCC calibration. The results show that no saturation e?ect occurs and the linearity of HCC is better than 10% from 30 MeV (1 MIP) to 1.1×103 TeV (energy density is 93 TeV/cm3), which can meet the requirement mentioned above.

submitted time 2017-11-10 Hits1640Downloads833 Comment 0

4. chinaXiv:201703.00255 [pdf]

Fuzzy sliding mode controller with integral sliding surface for permanent magnet synchronous motor

Jing Wang; Sheng-Wei Zhang; Yu Zhang
Subjects: Geosciences >> Space Physics

In this paper, sliding mode controller with integral sliding surface is proposed to reject the system disturbances for permanent magnet synchronous motor (PMSM) speed regulation system. To reduce the chattering phenomenon, the signum function is replaced by the saturation function and fuzzy module is introduced in sliding mode controller. Simulation results show that the proposed control method can obtain satisfactory tracking performance and dynamic performance with smaller chattering.

submitted time 2017-03-10 Hits1079Downloads624 Comment 0

5. chinaXiv:201607.00002 [pdf]

Generation of arbitrary radially polarized array beams by modulating the

Shijun Zhu; Jing Wang; Zhenhua Li
Subjects: Physics >> Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics

We demonstrate a convenient approach for simultaneously manipulating the amplitude and polarization of light beams by means of the modulation of the correlation structure. As an illustration, we constructed a periodic correlation structure that can generate an arbitrary radially polarized array (RPA) beam of a radial or rectangular symmetry array in the focal plane from a radially polarized (RP) beam. The physical realizability conditions for such source and the far-field beam condition are derived. It is illustrated that the beamlet shape and the state of polarization (SOP) can be effectively controlled by the initial correlation structure and the coherence width. Furthermore, by designing the source correlation structure, a tunable OK-shaped RPA beam and an optical cage are demonstrated, which can find widespread applications in non-destructive manipulation of particles and living biological cells. The arbitrariness in the design of correlation structure prompted us to find more convenient approaches for controlling the statistics of light beams in terms of amplitude and polarization.

submitted time 2016-07-01 Hits12920Downloads875 Comment 0

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