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Hs‒Spme‒Gc‒Ms/Lc‒Ms and Metabolomics Analysis Reveal the Effect of Tea Green Leafhoppers on Volatile and Non-Volatile- Metabolites of Zijin Cicada Autumn Tea

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SSRN 2023年

作者： Song, Feihu Liu, Zhiyu Zhou, Qiaoyi Li, Zhenfeng Song, Chunfang Ling, Caijin Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment & Technology School of Mechanical Engineering Jiangnan University Wuxi214122 China Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation and Utilization Tea Research Institute Guangdong Academy of Agricultural Sciences Guangzhou510640 China

The alteration of volatile and non-volatile metabolites with different biting degrees of Zijin Cicada Autumn Tea (ZJCAT) were indicated by high-performance liquid chromatography (HPLC), headspace solid phase microextraction gas chromatography‒mass spectrometry (HS-SPME-GC‒MS) and metabolomics. A total of 231 volatile metabolites and 898 non-volatile metabolites were identified with different biting degrees, which verified the changes of quality of ZJCAT. Among them, 111 common aroma-active compounds and 145 characteristic metabolites were selected (VIP>1.0 p © 2023, The Authors. All rights reserved.

关键词： Metabolites

Evaluation of Black Tea Appearance Sensory Quality by Using a Segmentation-Based Feature Extraction Method

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SSRN 2023年

作者： Song, Feihu Liu, Zhiyu Lin, Yiqing Lu, Xiaolong Zhou, Qiaoyi Li, Zhenfeng Ling, Caijin Song, Chunfang Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment & Technology School of Mechanical Engineering Jiangnan University Wuxi214122 China Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation and Utilization Tea Research Institute Guangdong Academy of Agricultural Sciences Guangzhou510640 China

Compared with the highly subjective manual sensory quality evaluation, the application of computer vision techniques in black tea appearance quality evaluation helps to establish an objective and efficient black tea quality evaluation system. In this study, Yinghong No. 9 black tea was taken as the research object, and the gold pekoe, color and strips were adopted as the sensory evaluation characteristics for black tea. An image segmentation method based on the improved K-means clustering algorithm was proposed to realize the segmentation of the dark background area, tea area and golden pekoe area. The CIELAB color model was used to extract color features of the tea area. The texture features extracted by the gray-level run-length matrix (GLRLM) were applied to evaluate the strips. The random forest (RF), support vector regression (SVR) and back propagation neural network (BPNN) were selected to construct prediction models for evaluating tea appearance quality. The proposed feature extraction method based on regional segmentation intuitively described the key evaluation characteristics of black tea appearance, and the predicted results were highly consistent with the manual sensory evaluation. © 2023, The Authors. All rights reserved.

关键词： Image enhancement

A Variable-speed Silent Speech Recognition Method based on Surface Electromyography Signal

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A Variable-speed Silent Speech Recognition Method based on S...

International Conference on advanced robotics and Mechatronics (ICARM)

作者： Sui Liang Yin Xu Zhaohua Yuan Lining Sun Weida Li Hongmiao Zhang School of Mechanical and Electric Engineering Soochow University Suzhou China Zoomlion Heavy Industry Science And Technology Co. Ltd Suzhou China Jiangsu Provincial Key Laboratory of Advanced Robotics Soochow University Suzhou China

In the practical implementation of silent speech recognition based on surface electromyography (sEMG) signal, the change in the subjects' speech speed will affect the recognition performance. To mitigate this effect, a silent speech recognition method based on dynamic time warping (DTW) algorithm is proposed in this paper. Specifically, the facial sEMG signals of 22 Chinese words are collected, the energy threshold method is used to detect the active segment, the root mean square feature is extracted, and finally the DTW algorithm is used for recognition. The experimental results show that the method is robust to silent speech recognition tasks with different speech speeds. The average accuracy of using the DTW algorithm to classify uniform-speed words is 94.55%, and that of variable-speed words is 71.82%. In addition, the proposed method is suitable for few samples learning, which means it can quickly adapt to new tasks and individuals. These findings provide a novel way for the practical application of sEMG based silent speech recognition.

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A High Capacity and Self-Healable Electrochromic System Based on I0/Cui Conversion Reaction

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SSRN 2024年

作者： Meng, Fengjiao Li, Menghan Guo, Tan Zhong, Junsen Feng, Kai Du, Lingyu Yang, Kunjie Kang, Litao College of Environment and Materials Engineering Yantai University Yantai264005 China Jiangsu Provincial Key Laboratory of Palygorskite Science and Applied Technology Huaiyin Institute of Technology Huaian223003 China Center for Microscopy and Analysis Nanjing University of Aeronautics and Astronautics Nanjing210016 China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai264000 China

Constructing electrochromic devices (ECDs) requires high-performance electrochromic electrodes with not only high color contrasts, but also large charge storage capacities. In this paper, a I0/CuI conversion-type electrochromic system is developed, achieving reversible and profound color switching between colorless transparent and dark brown, while delivering a large charge storage capacity of 246.7 mAh g-1. To improve switching durability, a multifunctional P10 (Polyquaternium-10) binder is introduced into the electrode, which can effectively confine the polyiodide intermediates and encapsulate copper species. At the same time, the CuI/Cu redox couple is further activated by controlling the applied voltage. The generated Cu of this couple can spontaneously react with residual I0 species and facilitate the conversion from I0 to CuI, and therefore in-situ rejuvenate the degraded electrochromic performance. Thanks to these rational designs, this electrochromic electrode achieves rapid response speeds (tcoloring: 14 s, tbleaching: 5 s), high optical modulation amplitude (73.4% at 500 nm), impressive coloration efficiency (57.0 cm2 C-1) and cycle stability (without performance degradation after 150 cycles). This work provides a novel electrochromic system for the construction of high-performance electrochromic devices. © 2024, The Authors. All rights reserved.

关键词： Electrochromic devices

Control design under attacks of multi-agent switched systems via arbitrary switching

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Control design under attacks of multi-agent switched systems...

2022 Chinese Automation Congress, CAC 2022

作者： Li, Zhanjie Ma, Yajing Nanjing University of Posts and Telecommunications Institute of Advanced Technology for Carbon Neutrality Nanjing China Sichuan Xihua University Provincial Engineering Research Center for New Energy Vehicle Intelligent Control and Simulation Test Technology Chengdu China School of Internet of Things Jiangsu Key Laboratory of Broadband Wireless Communication and Internet of Things Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781665465335

In this paper, the consensus control against attacks for a type of nonlinear multi-agent switched systems under arbitrary switching is studied. The attacks corrupt the information data, which cannot be used for the feedback design. Meanwhile, the switching logic is not allowed to be designed. To tackle the complicated effects, some intermediate variables and adaptive laws are introduced to compensate the uncertainties. By constructing a common Lyapunov function, an adaptive protocol is proposed such that the outputs of the agents achieve consensus against attacks under arbitrary switching. © 2022 IEEE.

关键词： Multi agent systems

A Novel Pt Modified Algan/Si Double-Junction Nanostructure for Stable and Self-Powered Solar Blind Photoelectrochemical Photodetection

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SSRN 2023年

作者： Guo, Xin You, Yajun Shao, Pengfei Bao, Aida National Key Laboratory for Electronic Measurement Technology North University of China 3 Xueyuan Road Shanxi Taiyuan030051 China Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University 163 Xianlin Road Nanjing210093 China

Simultaneously searching for self-powered, efficient, stable photoelectrode is the key to realizing the next-generation energy-efficient and sustainable integrated solar blind photoelectrochemical (PEC) photodetector. In this work, a Pt modified AlGaN/Si double-junction nanostructure with an n++ AlGaN/p++ AlGaN tunnel junction (TJ) and a AlGaN/Si junction is reported to achieve stable and self-powered solar blind photodetection. PEC tests demonstrate that the photocurrent density of the Pt modified AlGaN with n++ AlGaN/p++ AlGaN TJ photoelectrode can reach up to 56.1 μA/cm2 under 255 nm light irradiation with 1.1 mW/cm2 at 0 V bias versus a Pt counter electrode in a three-electrode configuration. Time-steady photoluminescence and XRD spectra are carried out and confirm the inherent optical and physical properties of this nanostructure. In addition, the multicycle and long-term stability measurement shows an excellent switching behavior even after being placed in the air for one month with a photocurrent density of -44.9 μA/cm2 (80% of its initial photocurrent). Furthermore, the PEC performance of the Pt modified AlGaN with n++ AlGaN/p++ AlGaN tunnel junction photoelectrode is evaluated in different light wavelengths, light intensities, bias potential and H2SO4 concentrations. These results demonstrate that the as-prepared photoelectrode has a great potential application in stable self-powered solar blind photodetector. © 2023, The Authors. All rights reserved.

关键词： Tunnel junctions

Cross-View Fused Network for Multi-View RGB-Based Action Recognition

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Cross-View Fused Network for Multi-View RGB-Based Action Rec...

International Conference on Vision, Image and Signal Processing (ICVISP)

作者： Yingyuan Yang Guoyuan Liang Xinyu Wu Biao Liu Chao Wang Jun Liang Jianquan Sun Chinese Academy of Sciences Shenzhen Institutes of Advanced Technology Shenzhen China The University of Chinese Academy of Sciences Beijing China Guangdong Provincial Key Laboratory of Robotics and Intelligent System Chinese Academy of Sciences Shenzhen Institutes of Advanced Technology Shenzhen China Guangzhou gosuncn robot Co. Ltd Guangzhou China China Nuclear Power Technology Research Institute Co. Ltd Shenzhen China

ISBN: (数字)9798331541460

ISBN: (纸本)9798331541477

As the increasing number of multi-camera surveillance systems, researchers have been investigating the potential of multi-view action recognition. The skeleton-based methods are favorable due to the good performance. However, relying on specialized hardware with depth sensors or the efficient estimation for human poses, makes them less suitable for real-world deployment. In this study, we concentrate on the RGB modality for multi-view action recognition and propose a novel cross-view fused network. In details, gated adaptive fusion is utilized to aggregate the global representation across different views and spatio-temporal cross-attention module is employed to facilitate the effective fusion for spatio-temporal features. Based on three well-known multi-view action datasets: NTU-60, NTU-120, and N-UCLA, a series of experiments are conducted and verifies the effectiveness and robustness of the method under multi-view scenarios.

关键词： Image recognition Aggregates Interactive systems Logic gates Streaming media Signal processing Video surveillance Robustness Real-time systems Sensors

An Excellent Synergy in Yield Strength and Plasticity of Nbtizrta0.25cr0.4 Refractory High Entropy Alloy Through the Regulation of Cooling Rates

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SSRN 2023年

作者： Jiang, Feng Wang, Jiarui Jiang, Qinwei Yang, Gongji Xu, Mingqin Yi, Jiaojiao Laboratory of Advanced Multicomponent Materials School of Mechanical Engineering Jiangsu University of Technology Changzhou213001 China School of Materials Science and Engineering Kunming University of Science and Technology Kunming650000 China Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion School of Materials Science and Engineering Hunan University of Science and Technology Xiangtan411201 China

A solidification process often determines the microstructure of alloys from the atomic scale to the macroscopic scale, which distinguishes the performance of an alloy from another. Among all modification measures, the cooling rate plays a vital role in the solidification process. Hereinto, to thoroughly investigate the cooling rate effects on phase components, microstructures and mechanical properties, a series of NbTiZrTa0.25Cr0.4 refractory high entropy alloys were prepared under a wide range of cooling rates. Results showed that the microstructure with a combined dendrite and interdendrite gradually coarsened as the cooling rate decreased, coupled with a single BCC phase transformed into BCC + Laves dual phase. During the microstructural evolution, the prominent strengthening mechanism (i.e., solution strengthening) of the alloy prepared under high cooling rates became weak, while the secondary strengthening mechanism (i.e., second phase strengthening associated with Laves phase) gradually reinforced. The reinforced second phase strengthening compensated for the weakened solution strengthening;as a result, the yield strength first decreased and then increased as the cooling rate decreased without sacrificing the plasticity of the alloys. Thus, the alloy prepared under an appropriate cooling rate of 62.5 K/s exhibited maximum yield strength of 1452 MPa and maintained a competitive plasticity of approximately 23.2%, which exceeded the NbTiZrTa0.25Crx system and other reported refractory high entropy alloys. This study provides insight into the development of high-temperature alloys and a promising avenue to enhance the performance of an alloy by regulating the cooling rates. © 2023, The Authors. All rights reserved.

关键词： Yield stress

Enabling the immune escaped etesevimab fully-armed against SARS-CoV-2 Omicron subvariants including KP.2

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hLife 2025年第3期3卷 132-145页

作者： Chao Su Juanhua He Yufeng Xie Yu Hu Xin Li Shitong Qiao Peipei Liu Min Huang Rong Zhang Liang Wang Zhen Chang Wenqiao Sun Ke Xu Jing Zhang Longxing Cao Pengcheng Han Xin Zhao Jianxun Qi Qihui Wang Mengsu Yang George Fu Gao Department of Biomedical Sciences City University of Hong KongHong KongChina CAS Key Laboratory of Pathogen Microbiology and Immunology Institute of MicrobiologyChinese Academy of SciencesBeijingChina Jiangsu Provincial Key Laboratory of Critical Care Medicine School of MedicineZhongda HospitalAdvanced Institute for Life and HealthSoutheast UniversityJiangsuChina Institute of Pediatrics Shenzhen Children's HospitalGuangdongChina Department of Basic Medical Sciences School of MedicineTsinghua UniversityBeijingChina School of Life Sciences Division of Life Sciences and MedicineUniversity of Science and Technology of ChinaAnhuiChina University of Chinese Academy of Sciences BeijingChina NHC Key Laboratory of Biosafety National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijingChina State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources Guangxi UniversityGuangxiChina CAS Key Laboratory of Pathogen Microbiology and Immunology Institute of MicrobiologyCenter for Influenza Research and Early-warning(CASCIRE)CAS-TWAS Center of Excellence for Emerging Infectious Diseases(CEEID)Chinese Academy of SciencesBeijingChina Department of Pathogen Microbiology School of Basic Medical SciencesCapital Medical UniversityBeijingChina Institute of Physical Science and Information Anhui UniversityAnhuiChina School of Life Sciences Westlake UniversityZhejiangChina

Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)is continuously evolving since *** monoclonal antibodies(mAbs)have been developed and widely used,such as etesevimab(CB6)developed by Eli-Lilly/***,the mAb escaped from the variant of concern(VOC)ever since the emergence of Beta VOC,with a complete loss of efficacy against the Omicron ***,we developed a broad-spectrum and affinity-mature antibody design(BAADesign)procedure to design CB6,enabling it to bind to the receptor-binding domains(RBDs)of multiple important Omicron subvariants,including the recent variant *** analysis confirmed the desired CB6-RBD ***,identical mutations in the complementarity determining regions(CDR)1 and CDR2 of the CB6 mutants also restored neutralizing potency for some RBD-1 group ***,the enhanced CB6 neutralizing capacity makes it a promising candidate against SARS-CoV-2 infection,and the BAADesign method has implications for the design of other antibodies.

关键词： etesevimab(CB6) severe acute respiratory syndrome coronavirus 2(SARS-CoV-2) receptor-binding domain(RBD) broad-spectrum and affinity-mature antibody design(BAADesign) antibody