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2019 International Conference on Artificial Intelligence and Computer science, AICS 2019

作者： Han, Yongming Chen, Kai Ouyang, Zhi Zhang, Mingxing Wang, Yajie Geng, Zhiqiang Wei, Qin Guizhou Provincial Key Laboratory of Public Big Data Guiyang550025 China College of Information Science and Technology Beijing University of Chemical Technology Beijing100029 China Guizhou Academy of Science Guiyang550001 China

ISBN: (纸本)9781450371506

The production of industrial process is the key factor of evaluating the national industry production level. Therefore, this paper proposes total factor productivity analysis method based on Malmquist model to analyze the production efficiency statically and dynamically. Based on the input and output data of ethylene production plants in China, the total factor production index of ethylene production plants in industrial processes is decomposed into technical efficiency, technical progress, pure technical efficiency and scale efficiency through the Malmquist model based on the data envelopment analysis (DEA). Moreover, the energy efficiency of ethylene production plants can be improved. © 2019 Association for Computing Machinery.

关键词： Data envelopment analysis

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Feasibility analysis of gas storage salt caverns in ultra-deep strata with thick interlayers

Geoenergy Science and Engineering

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Geoenergy science and Engineering 2025年 254卷

作者： Hang Li Chunhe Yang Hongling Ma Zhentao Li Xiaopeng Liang Rui Cai Xuan Wang Jiangyu Fang Ziheng Wang State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400044 China School of Resources and Safety Engineering Chongqing University Chongqing 400044 China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China University of Chinese Academy of Sciences Beijing 100049 China China Academy of Safety Science and Technology Beijing 100012 China Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources Changjiang River Scientific Research Institute Wuhan 430010 Hubei China

To address peak-shaving demand and ensure energy security, deep underground energy storage stands as a crucial approach in the development of future energy reserves. The target depth of the underground gas storage salt cavern (GSSC) in the Jingjie district of Yulin City, China, exceeds 2600 m. Based on the geological characteristics, a new scheme for constructing an ultra-deep GSSC with thick interlayers was proposed, and a geomechanical model was developed. The simulation results indicated that the thick interlayer in 9 sub-members collapsed when the cavern pressure decreased to 12 MPa. Based on an extensive evaluation system, the stability of the GSSC with thick interlayers was analyzed. The results indicated that as operational pressure increased, there was a decrease in the displacement, volume shrinkage (VS), and plastic zone, alongside an increase in vertical stress and the safety factor (SF). The minimum operation pressure (MOP) range of 28–48 MPa is proposed to adhere to the stability criteria. A novel method for gas storage utilizing the void space within bottom sediments is proposed. The available volume of the cavern using sediment voids (7.43 × 10 5 m 3 ) is about 1.36 times that of the conventional cavern (5.48 × 10 5 m 3 ). The use of sediment voids can significantly improve the energy storage capacity of caverns. The research results demonstrated that Jingjie ultra-deep GSSC has good feasibility.

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The combination of dietary active dry yeast and Bacillus subtilis improves productive performance, egg quality, and immunity of aged breeder hens

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Animal Nutrition 2025年

作者： Yuchen Liu Xintong Wang Xiaoyu Zhao Ying Ma Lujiang Qu Zhong Wang Zhonghua Ning National Engineering Laboratory for Animal Breeding and Key Laboratory of Animal Genetics Breeding and Reproduction Ministry of Agriculture and Rural Affairs College of Animal Science and Technology China Agricultural University Beijing 100193 China State Key Laboratory of Animal Nutrition Key Laboratory of Animal (Poultry) Genetics Breeding and Reproduction Ministry of Agriculture and Rural Affairs Institute of Animal Science Chinese Academy of Agricultural Sciences Beijing 100193 China Key Laboratory of Precision Nutrition and Food Quality Department of Nutrition and Health China Agricultural University Beijing 100083 China Xingrui Agricultural Stock Breeding Co. Ltd. Baoding 072551 China

This study aimed to investigate the effects of dietary supplementation with active dry yeast (ADY) alone or in combination with Bacillus subtilis (BS) on physiological parameters (laying performance, egg quality, blood indexes), reproductive traits, ileum microbiome, metabolome, and uterine gene expression in aged breeder hens. A total of 336 Hy-line brown layer hens aged 55 weeks were randomly assigned to three groups using a completely randomized design: control group (Con, basal diet), ADY group (1 g ADY/kg diet), and ADY-BS combination group (1 g ADY + 0.1 g BS/kg diet). Compared with the Con group, ADY-BS group significantly improved egg production ( P = 0.024) and reduced feed conversion ratio ( P = 0.034), while also significantly increasing feed intake compared to the ADY group ( P = 0.020). Additionally, both ADY and ADY-BS significantly enhanced eggshell-breaking strength compared to untreated hens ( P < 0.001), with ADY-BS further notably increasing lysozyme levels ( P = 0.031), antibody titers against avian influenza H5 and H9 subtypes ( P = 0.008 and P = 0.001, respectively), and calcium content in serum ( P = 0.021). analysis of the ileal microbiota revealed significant modifications, as evidenced by reduced richness (Chao1 index: P = 0.016 and P = 0.008 for the ADY and ADY-BS groups, respectively) and improved evenness (Simpson index: P = 0.032 for both groups). Relative to the untreated group hens, ADY enriched Streptococcus ( P = 0.007), Enterococcus ( P = 0.009), and Gallibacterium ( P = 0.027), whereas ADY-BS remarkably enriched Lactobacillus ( P = 0.028). Furthermore, Lactobacillus enriched in ADY-BS group hens was negatively correlated with ileum differential metabolites such as phenylalanyl-threonine and phenylalanyl-tryptophan. Correlation analysis indicated that these differential metabolites were negatively associated with gene expressions related to calcium ion transport and immune pathways in the uterus based on the data of RNA sequence. I

关键词： Active dry yeast Bacillus subtilis Aged breeder hen Laying performance Egg quality Multiomics

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Detection of Deepfake videos using long distance attention

arXiv

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arXiv 2021年

作者： Lu, Wei Liu, Lingyi Luo, Junwei Zhao, Xianfeng Zhou, Yicong Huang, Jiwu School of Computer Science and Engineering Guangdong Province Key Laboratory of Information Security Technology Ministry of Education Key Laboratory of Machine Intelligence and Advanced Computing Sun Yat-sen University Guangzhou510006 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing100195 China School of Cyber Security University of Chinese Academy of Sciences Beijing100195 China Department of Computer and Information Science University of Macau 999078 China Guangdong Key Laboratory of Intelligent Information Processing Shenzhen Key Laboratory of Media Security Shenzhen University Shenzhen518060 China Shenzhen Institute of Artificial Intelligence and Robotics for Society Shenzhen518055 China

With the rapid progress of deepfake techniques in recent years, facial video forgery can generate highly deceptive video contents and bring severe security threats. And detection of such forgery videos is much more urgent and challenging. Most existing detection methods treat the problem as a vanilla binary classification problem. In this paper, the problem is treated as a special fine-grained classification problem since the differences between fake and real faces are very subtle. It is observed that most existing face forgery methods left some common artifacts in the spatial domain and time domain, including generative defects in the spatial domain and inter-frame inconsistencies in the time domain. And a spatial-temporal model is proposed which has two components for capturing spatial and temporal forgery traces in global perspective respectively. The two components are designed using a novel long distance attention mechanism. The one component of the spatial domain is used to capture artifacts in a single frame, and the other component of the time domain is used to capture artifacts in consecutive frames. They generate attention maps in the form of patches. The attention method has a broader vision which contributes to better assembling global information and extracting local statistic information. Finally, the attention maps are used to guide the network to focus on pivotal parts of the face, just like other fine-grained classification methods. The experimental results on different public datasets demonstrate that the proposed method achieves the state-of-the-art performance, and the proposed long distance attention method can effectively capture pivotal parts for face forgery. Copyright © 2021, The Authors. All rights reserved.

关键词： Time domain analysis

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Water–oil displacement in prefried potatoes during freezing–thawing and reheating: A simulation of the industrial prepared dishes supply chain

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Food Chemistry 2025年 490卷

作者： Hengxun Lin Liye Cui Meisui Tian Wenqiang Guan Prince Chisoro Xia Li Yiping Yang Yong Chen Xiangning Chen Christophe Blecker Chunhui Zhang Institute of Food Science and Technology Chinese Academy of Agricultural Sciences Key Laboratory of Agro-products Quality and Safety Control in Storage and Transport Process Ministry of Agriculture and Rural Affairs Beijing 100193 China Gembloux Agro-Bio Tech University of Liège Gembloux B-5030 Belgium Tianjin Key Laboratory of Food Biotechnology Tianjin University of Commerce Tianjin 300134 China Food Science and Engineering College Beijing University of Agriculture Beijing 100193 China

Prefried potato is a common semi-finished product used in catering services. However, the quality changes that occur during its transition from a semi-finished to a finished dish remain unclear. This study investigated the moisture and oil content changes in prefried potatoes during freezing–thawing and various reheating processes. The results showed that the oil contents of prefried, prefried–refried, and prefried–reboiled potatoes were 2.14 %, 3.34 %, and 1.33 %, respectively. The moisture content of prefried–reboiled potatoes was higher than that of prefried and prefried–refried samples. SEM and MRI analysis revealed that freezing significantly ( P < 0.05) increased porosity and promoted water–oil exchange in frozen–refried and frozen–reboiled potatoes. Ice melting contributed to reduced porosity and inhibited oil absorption in thawed–refried samples. However, there were no significant differences ( P > 0.05) in moisture and oil content between frozen–reboiled and thawed–reboiled samples. This study provides new insights into the quality changes of semi-finished foods during industrial processing.

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GRB 220408B: A Three-Episode Burst from a Precessing Jet

arXiv

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arXiv 2023年

作者： Zhang, Zijian Yin, Yihan Wang, Chenyu Wang, Xiangyu Ivy Yang, Jun Meng, Yan-Zhi Liu, Zi-Ke Chen, Guo-Yin Fu, Xiaoping Gao, Huaizhong Li, Sihao Liu, Yihui Long, Xiangyun Ma, Yong-Chang Pan, Xiaofan Sun, Yuanze Wu, Wei Yang, Zirui Ye, Zhizhen Yu, Xiaoyu Zhao, Shuheng Zheng, Xutao Zhou, Tao Tang, Qing-Wen Yan, Qiurong Zhou, Rong Wang, Zhonghai Feng, Hua Zeng, Ming Zhang, Bin-Bin School of Astronomy and Space Science Nanjing University Nanjing210093 China School of Physics Nanjing University Nanjing210093 China Department of Astronomy Tsinghua University Beijing100084 China Key Laboratory of Modern Astronomy and Astrophysics [Nanjing University Ministry of Education China School of Information Engineering Nanchang University Nanchang330031 China Department of Engineering Physics Tsinghua University Beijing100084 China Department of Health Physics China Institute for Radiation Protection Taiyuan300000 China Key Laboratory of Radiation Physics and Technology of Ministry of Education College of Physics of Sichuan University Chengdu China School of Artificial Intelligence Nanjing University Nanjing210093 China Ministry of Education Beijing100084 China Department of Computer Science and Technology Nanjing University Nanjing210093 China School of Chemistry and Chemical Engineering Nanjing University Nanjing210093 China College of Engineering and Applied Sciences Nanjing University Nanjing210093 China Department of Physics School of Physics and Materials Science Nanchang University Nanchang330031 China Purple Mountain Observatory Chinese Academy of Sciences Nanjing210023 China

Jet precession has previously been proposed to explain the apparently repeating features in the light curves of a few gamma-ray bursts (GRBs). In this Letter, we further apply the precession model to a bright GRB 220408B by examining both its temporal and spectral consistency with the predictions of the model. As one of the recently confirmed GRBs observed by our GRID CubeSat mission, GRB 220408B is noteworthy as it exhibits three apparently similar emission episodes. Furthermore, the similarities are reinforced by their strong temporal correlations and similar features in terms of spectral evolution and spectral lags. Our analysis demonstrates that these features can be well explained by the modulated emission of a Fast-Rise-Exponential-Decay (FRED) shape light curve intrinsically produced by a precessing jet with a precession period of 18.4 ± 0.2 seconds, a nutation period of 11.1 ± 0.2 seconds and viewed off-axis. This study provides a straightforward explanation for the complex yet similar multi-episode GRB light curves. Copyright © 2023, The Authors. All rights reserved.

关键词： Gamma rays

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Characteristics and Mechanism of Karst Groundwater Cycle Evolution Under Large-Scale Exploitation: A Case Study of the Yanxi Karst Groundwater System

SSRN

引用

SSRN 2024年

作者： Feng, Yawei Kang, Fengxin Shi, Fengfeng Meng, Xianzhou Fu, Yifu Li, Aijun Chen, Hao He, Qingcheng School of Water Resources and Environment China University of Geosciences Beijing100083 China Shandong Provincial Lunan Geology and Exploration Institute Shandong Provincial Bureau of Geology and Mineral Resources No.2 Geological Brigade Jining272100 China Observation and Research Station of Shandong Yangzhuang Karst Ecosystem Ministry of Natural Resources Jining272100 China Key Laboratory of Karst Geology Shandong Provincial Bureau of Geology and Mineral Resources Jining272100 China College of Earth Science and Engineering Shandong University of Science and Technology Qingdao266590 China Shandong Provincial Bureau of Geological and Mineral Exploration and Development Jinan250013 China School of Water Conservancy and Environment University of Jinan Jinan250024 China Chinese Academy of Geological Sciences Beijing100084 China

Study region: The Yanxi karst groundwater system in northern *** focus: By analyzing long timeseries monitoring data of the groundwater level, groundwater quality, and groundwater withdrawal over the past 30 years, this paper aims to evaluate the regime characteristics of the karst groundwater in the Yanxi fault block and guide the rational exploitation and utilization of groundwater. Using groundwater regime analysis, hydrogeochemical analysis, and isotope analysis, the evolution of the karst groundwater regime under large-scale exploitation conditions is *** hydrological insights for the region: The results reveal that before and after large-scale exploitation, the karst groundwater cycle conditions changed fundamentally, the karst groundwaterlevel continued to fall below the sea table for a long time, and the main discharged changed from lateral runoff to centralized exploitation in the groundwater source field. The spatial distribution of the karst groundwater quality is closely related to the distribution of the surface water quality and coal measure strata. The hydrochemical components are mainly controlled by the dissolution of the minerals in the Ordovician limestone and, to a certain extent, by the dissolution of silicate-rock minerals. The mineral precipitation and concentration caused by evaporation are relatively weak. It is urgent to take a series of management and protection measures for groundwater resources to curb the evolution trend of the groundwater environment. © 2024, The Authors. All rights reserved.

关键词： Dissolution

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Comparative evaluation of the physicochemical properties of nano-hydroxyapatite/collagen and natural bone ceramic/collagen scaffolds and their osteogenesis-promoting effect on MC3T3-E1 cells

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Regenerative Biomaterials 2019年第6期6卷 361-371页

作者： Xiongxin Lei Jianping Gao Fangyu Xing Yang Zhang Ye Ma Guifeng Zhang National Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical and Engineering University of Chinese Academy of SciencesBeijing 100049China College of Food Science and Engineering Shandong Agricultural UniversityTaian 271018China School of Life Science and Technology Henan Institute of Science and TechnologyHenan453003China Department of Pathogen Biology and Immunology School of Basic CourseGuandong Pharmaceutical UniversityGuangzhou510006China

The use of various types of calcium phosphate has been reported in the preparation of repairing materials for bone ***,the physicochemical and biological properties among them might be vastly *** this study,we prepared two types of calcium phosphates,nano-hydroxyapatite(nHA)and natural bone ceramic(NBC),into 3D scaffolds by mixing with type I collagen(CoL),resulting in the nHA/CoL and NBC/CoL *** then evaluated and compared the physicochemical and biological properties of these two calcium phosphates and their composite scaffold with *** electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),Fourier-transform infrared spectroscopy(FTIR),X-ray diffraction spectroscopy(XRD)and compressive tests were used to,respectively,characterize the morphology,composition,distribution and the effect of nHA and NBC to ***,we examined the biological properties of the scaffolds using cytotoxicity testing,flow cytometry,immunofluorescence staining,biocompatibility testing,CCK-8 assays and *** results reflected that the Ca2t released from nHA and NBC could bind chemically with collagen and affect its physicochemical properties,including the infrared absorption spectrum and compression modulus,among ***,the two kinds of scaffolds could promote the expression of osteo-relative genes,but showed different gene induction *** short,NBC/CoL could promote the expression of early osteogenic genes,while nHA/CoL could upregulate late osteogenic ***,these two composite scaffolds could provide MC3T3-E1 cells with a biomimetic surface for adhesion,proliferation and the formation of mineralized extracellular ***,nHA/CoL and NBC/CoL had different effects on the period and extent ofMC3T3-E1 cell mineralization.

关键词： nano-hydroxyapatite natural bone ceramic collagen scaffold MC3T3-E1 osteoblasts

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The “Fingerprint” of a freshwater microalga Scenedesmus sp. LX1:Visualizing the composition of its soluble algal products

引用

Chinese Chemical Letters 2019年第5期30卷 1126-1128页

作者： Yinhu Wu Yin Yu Hongying Hu Environmental Simulation and Pollution Control State Key Joint Laboratory State Environmental Protection Key Laboratory of Microorganism Application and Risk Control(SMARC)School of EnvironmentTsinghua UniversityBeijing 100084China State Key Laboratory of Environmental Criteria and Risk Assessment Research Center of Water Pollution Control TechnologyChinese Research Academy of Environmental SciencesBeijing 100012China Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen InstituteShenzhen 518055China

In this study,a fingerprint analysis method along with the EEM fluorescence spectra was used to characterize the SAPs released by Scenedesmus ***1 during the growth *** fractionation was used firstly to divide the SAPs into six resin fractions,and then size exclusion chromatography(SEC)was performed to separate each resin fraction into several subfractions with different molecular weights(MW).The fingerprint graph integrated the information revealed by resin fractionation as well as that by SEC,showing that main components of SAPs changed from the hydrophilic subfractions with MW of 10~2-10~3 Da to the hydrophobic subfractions with MW of 10~3-10~4 *** these results with the EEM fluorescence spectra of different resin fractions,the change of the main matters within SAPs could be inferred.

关键词： Microalgae Soluble algal products Fingerprint analysis Resin fractionation Molecular weight distribution

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Measurement of the cosmic p+He energy spectrum from 50 GeV to 0.5 PeV with the DAMPE space mission

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Physical Review D 2024年第12期109卷 L121101-L121101页

作者： F. Alemanno C. Altomare Q. An P. Azzarello F. C. T. Barbato P. Bernardini X. J. Bi I. Cagnoli M. S. Cai E. Casilli E. Catanzani J. Chang D. Y. Chen J. L. Chen Z. F. Chen P. Coppin M. Y. Cui T. S. Cui Y. X. Cui H. T. Dai A. De Benedittis I. De Mitri F. de Palma M. Deliyergiyev A. Di Giovanni M. Di Santo Q. Ding T. K. Dong Z. X. Dong G. Donvito D. Droz J. L. Duan K. K. Duan R. R. Fan Y. Z. Fan F. Fang K. Fang C. Q. Feng L. Feng M. Fernandez Alonso J. M. Frieden P. Fusco M. Gao F. Gargano K. Gong Y. Z. Gong D. Y. Guo J. H. Guo S. X. Han Y. M. Hu G. S. Huang X. Y. Huang Y. Y. Huang M. Ionica L. Y. Jiang Y. Z. Jiang W. Jiang J. Kong A. Kotenko D. Kyratzis S. J. Lei W. H. Li W. L. Li X. Li X. Q. Li Y. M. Liang C. M. Liu H. Liu J. Liu S. B. Liu Y. Liu F. Loparco C. N. Luo M. Ma P. X. Ma T. Ma X. Y. Ma G. Marsella M. N. Mazziotta D. Mo M. Muoz Salinas X. Y. Niu X. Pan A. Parenti W. X. Peng X. Y. Peng C. Perrina E. Putti-Garcia R. Qiao J. N. Rao A. Ruina Z. Shangguan W. H. Shen Z. Q. Shen Z. T. Shen L. Silveri J. X. Song M. Stolpovskiy H. Su M. Su H. R. Sun Z. Y. Sun A. Surdo X. J. Teng A. Tykhonov J. Z. Wang L. G. Wang S. Wang S. X. Wang X. L. Wang Y. Wang Y. F. Wang Y. Z. Wang Z. M. Wang D. M. Wei J. J. Wei Y. F. Wei D. Wu J. Wu L. B. Wu S. S. Wu X. Wu Z. Q. Xia H. T. Xu J. Xu Z. H. Xu Z. L. Xu E. H. Xu Z. Z. Xu G. F. Xue H. B. Yang P. Yang Y. Q. Yang H. J. Yao Y. H. Yu G. W. Yuan Q. Yuan C. Yue J. J. Zang S. X. Zhang W. Z. Zhang Yan Zhang Yi Zhang Y. J. Zhang Y. L. Zhang Y. P. Zhang Y. Q. Zhang Z. Zhang Z. Y. Zhang C. Zhao H. Y. Zhao X. F. Zhao C. Y. Zhou Y. Zhu Via Iacobucci 2 I-67100 L’Aquila Italy —Laboratori Nazionali del Gran Sasso I-67100 Assergi L’Aquila Italy Istituto Nazionale di Fisica Nucleare (INFN)—Sezione di Bari I-70125 Bari Italy State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei 230026 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China Department of Nuclear and Particle Physics University of Geneva CH-1211 Geneva Switzerland Dipartimento di Matematica e Fisica E. De Giorgi Università del Salento I-73100 Lecce Italy Istituto Nazionale di Fisica Nucleare (INFN)—Sezione di Lecce I-73100 Lecce Italy Institute of High Energy Physics Chinese Academy of Sciences Yuquan Road 19B Beijing 100049 China University of Chinese Academy of Sciences Yuquan Road 19A Beijing 100049 China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210023 China School of Astronomy and Space Science University of Science and Technology of China Hefei 230026 China Istituto Nazionale di Fisica Nucleare (INFN)—Sezione di Perugia I-06123 Perugia Italy Institute of Modern Physics Chinese Academy of Sciences Nanchang Road 509 Lanzhou 730000 China National Space Science Center Chinese Academy of Sciences Nanertiao 1 Zhongguancun Haidian district Beijing 100190 China Dipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari I-70126 Bari Italy Department of Physics and Laboratory for Space Research the University of Hong Kong Pok Fu Lam Hong Kong SAR China

Recent observations of the light component of the cosmic-ray spectrum have revealed unexpected features that motivate further and more precise measurements up to the highest energies. The Dark Matter Particle Explorer is a satellite-based cosmic-ray experiment that has been operational since December 2015, continuously collecting data on high-energy cosmic particles with very good statistics, energy resolution, and particle identification capabilities. In this work, the latest measurements of the energy spectrum of proton+helium in the energy range from 46 GeV to 464 TeV are presented. Among the most distinctive features of the spectrum, a spectral hardening at 600 GeV has been observed, along with a softening at 29 TeV measured with a 6.6σ significance. Moreover, the detector features and the analysis approach allowed for the extension of the spectral measurement up to the sub-PeV region. Even if with small statistical significance due to the low number of events, data suggest a new spectral hardening at about 150 TeV.

关键词： Cosmic ray acceleration Cosmic ray composition & spectra Cosmic ray propagation Cosmic ray sources Cosmic rays & astroparticles

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