期刊:
Journal of Soils and Sediments,2024年 ISSN:1439-0108
通讯作者:
Liu, Muxing;Yi, J
作者机构:
[Yi, Jun; Lu, Shiguo; Liu, Muxing; Zhang, Hailin; Liu, MX; Wang, Weijie] Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan 430079, Peoples R China.;[Yi, Jun; Lu, Shiguo; Liu, Muxing; Zhang, Hailin; Liu, MX; Wang, Weijie] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.;[Wan, Jinhong] Inst Water Resources & Hydropower Res, Beijing 100048, Peoples R China.
通讯机构:
[Yi, J ; Liu, MX] C;Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.
关键词:
Soil infiltration response;Forest conversion;Hillslope hydrology;Humid area
摘要:
PurposeUnderstanding the characteristics of soil infiltration response to rainfall is critical for soil water transport processes and hydrologic modeling. However, little is known about how they vary with forest conversion at different temporal stages (< 20 years) below the rooting zone. Therefore, this study aims to investigate soil infiltration response patterns in different subtropical forest conversion hillslopes, including mature original forest (thick root), young secondary forest (middle root), and very young secondary grassland (fine root), and analyzed the effects of environmental factors on the dynamics of soil infiltration.Materials and methodsSeveral metrics were evaluated to characterize and quantify the nature of these responses by estimating changes in the soil water content, the response time difference between two adjacent soil depths, and infiltration velocities for 1144 infiltration events at 6 locations on the three hillslopes.Results and discussionSoil infiltration responses were similar on both forestland hillslopes, yet significantly different from those on the grassland hillslope. The preferential flow was more evident in the profile of thick-rooted vegetation, and the velocity of the wetting front was faster in the profiles of middle- and fine-rooted vegetation. Topography and root characteristics interact to influence soil infiltration response at the hillslope scale.ConclusionsConversion from thick-rooted forests into fine-rooted grasslands altered the rainfall-related soil infiltration dynamics below the rooting zone. In particular, the occurrence of preferential flow and infiltration rates varied, which helps enhance our understanding of ecohydrological processes in the context of changing land use and hydroclimatic conditions.
作者机构:
[Xu, Weiqing; Zhu, Chengzhou; Wu, Yu; Zhu, CZ; Gu, Wenling] Cent China Normal Univ, Coll Chem, Int Joint Res Ctr Intelligent Biosensing Technol &, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.;[Lin, YH; Du, Dan; Lin, Yuehe] Washington State Univ, Sch Mech & Mat Engn, Pullman, WA 99164 USA.
通讯机构:
[Lin, YH ] W;[Zhu, CZ ] C;Cent China Normal Univ, Coll Chem, Int Joint Res Ctr Intelligent Biosensing Technol &, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.;Washington State Univ, Sch Mech & Mat Engn, Pullman, WA 99164 USA.
摘要:
Natural metalloenzymes with astonishing reaction activity and specificity underpin essential life transformations. Nevertheless, enzymes only operate under mild conditions to keep sophisticated structures active, limiting their potential applications. Artificial metalloenzymes that recapitulate the catalytic activity of enzymes can not only circumvent the enzymatic fragility but also bring versatile functions into practice. Among them, metal-organic frameworks (MOFs) featuring diverse and site-isolated metal sites and supramolecular structures have emerged as promising candidates for metalloenzymes to move toward unparalleled properties and behaviour of enzymes. In this review, we systematically summarize the significant advances in MOF-based metalloenzyme mimics with a special emphasis on active pocket engineering at the atomic level, including primary catalytic sites and secondary coordination spheres. Then, the deep understanding of catalytic mechanisms and their advanced applications are discussed. Finally, a perspective on this emerging frontier research is provided to advance bioinspired catalysis. This review systematically summarizes the significant advances in MOF-based metalloenzyme mimics for bioinspired catalysis with a special emphasis on active pocket engineering at the atomic level.
期刊:
Journal of Hazardous Materials,2024年465:133269 ISSN:0304-3894
通讯作者:
Wang, Jinlong;Guo, Yanbing
作者机构:
[Wu, Yan; Luo, Zhu; Liu, Guoli; Chen, Xiaoping; Guo, Yanbing; Hu, Zhixin; Li, Weihao; Wang, Jinlong] College of Chemistry, Central China Normal University, Wuhan 430079, PR China;[Miao, Lei; Liu, Zuocheng] School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;[Luo, Zhu; Guo, Yanbing; Wang, Jinlong] Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, Wuhan 430079, PR China;[Luo, Zhu] Wuhan Institute of Photochemistry and Technology, Wuhan 430083, PR China;[Wang, Jinlong] Wuhan Institute of Photochemistry and Technology, Wuhan 430083, PR China. Electronic address: wjl2022@ccnu.edu.cn
通讯机构:
[Wang, Jinlong; Guo, Yanbing] W;Wuhan Institute of Photochemistry and Technology, Wuhan 430083, PR China. Electronic address:
摘要:
The contamination of drinking water by microbes is a critical health concern, underscoring the need for safe, reliable, and efficient methods to treat pathogenic microorganisms. While most sterilization materials are available in powder form, this presents safety risks and challenges in recycling. Herein, this study reports the preparation of an innovative copper oxide supported silver monolithic nanoarray mesh with abundant oxygen vacancies (Ag/CuO-V(O)) by laser ablation. The instantaneous high temperature caused by laser ablation preserves the material's original structure while generating oxygen vacancies on the CuO surface. The Ag/CuO-V(O) mesh demonstrated a remarkable ability to inactivate over 99% of Escherichia coli (E. Coli) within 20min. The oxygen vacancies in the Ag/CuO-V(O) enhance interactions between oxygen species and the Ag/CuO-V(O), leading to the accumulation of large amounts of reactive oxygen species (ROS). The generated ROS effectively disrupt both layers of the bacterial cell wall - the peptidoglycan and the phospholipid - as confirmed by Fourier Transform Infrared (FTIR) spectroscopy, culminating in cell death. This research presents a monolithic material capable of inactivating pathogenic microorganisms efficiently, offering a significant advancement in water sterilization technology.
期刊:
International Journal of Machine Learning and Cybernetics,2024年 ISSN:1868-8071
通讯作者:
Zhou, LG
作者机构:
[Zhou, Yuanyuan; Zheng, Chengli] Cent China Normal Univ, Financial Engn Res Ctr, Sch Econ & Business Adm, Wuhan 430079, Peoples R China.;[Wu, Peng] Anhui Univ, Sch Business, Hefei 230601, Peoples R China.;[Zhou, Ligang] Anhui Univ, Sch Math Sci, Hefei 230601, Peoples R China.
通讯机构:
[Zhou, LG ] A;Anhui Univ, Sch Math Sci, Hefei 230601, Peoples R China.
关键词:
Additive trapezoidal fuzzy preference relation;Priority vector;Compatibility;COWA operator;Optimization model
摘要:
Considering the conflicting opinions and different risk attitudes among decision-makers (DMs) in group decision making (GDM), this paper develops a novel compatibility model with additive trapezoidal fuzzy environment based on continuous ordered weighted averaging (COWA) operator to handle the conflicts. First, some concepts of COWA operator-based compatibility index and characteristic preference relation for additive trapezoidal fuzzy preference relation (ATFPR) are discussed. Then a compatibility reaching algorithm is designed to assist each ATFPR in achieving acceptable compatibility. Moreover, the expert weight optimization model based on the criterion of minimum compatibility of preference relation in GDM is established. Furthermore, a GDM process based on compatibility measures with ATFPRs is introduced, and an application of the proposed approach is put forward. The novelties of our approach are that: (1) COWA operator can deal with the compatibility of all arguments by using controlled parameters that consider the risk attitudes of DMs rather than the compatibility of the simply two points in intervals; (2) compatibility improving algorithm makes sure that the original opinions are retained as much as possible because only one pair of preference relation elements are revised in each round; (3) optimal weights model ensures that weights of DMs in group aggregation are determined availably.
摘要:
This paper explores the knowledge network structure of foreign research literature by applying the qualitative comparative analysis (QCA) method to the field of information science and library science (ISLS) from the perspective of the cocitation of social network actors such as authors, institutions, countries, and literature, and it further reveals the future application trends of this method. [Method/process] Based on 86 journals in the ISLS field that were downloaded from the Web of Science using the QCA method, the social network analysis (SNA) method and the visual analysis tool Gephi are used to analyse the author cooperation network, the research institution cooperation network, the national cooperation network, the cocitation network, the cutting-edge trends, etc., of journal papers. The analysis shows that the QCA method covers a wide range within the field of ISLS, but the research topics involved in this field are not concentrated, and the author cooperation network has scale-free characteristics. The application of the QCA method is still dominant in European and American countries, and China, the USA, and Italy all play key roles in the national cooperation network. Finally, the institutional cooperation network has certain small group attributes.
期刊:
Journal of Computer Assisted Learning,2024年 ISSN:0266-4909
通讯作者:
Zhou, ZK
作者机构:
[Xie, Heping] South China Normal Univ, Sch Studies Fundamental Educ, Shanwei, Peoples R China.;[Zhou, Zongkui] Cent China Normal Univ, Sch Psychol, Wuhan, Peoples R China.;[Zhou, Zongkui] Minist Educ, Key Lab Adolescent Cyberpsychol & Behav CCNU, Wuhan, Peoples R China.;[Zhou, Zongkui] Cent China Normal Univ, Sch Psychol, 152 Luoyu St, Wuhan 430079, Peoples R China.
通讯机构:
[Zhou, ZK ] C;Cent China Normal Univ, Sch Psychol, 152 Luoyu St, Wuhan 430079, Peoples R China.
关键词:
attention guidance;eye tracking;learning by drawing;learning outcome;touchscreens
摘要:
Background Drawing is generally regarded as a promising learning strategy and has been explored in the touchscreen setting with different drawing modes. Although both a finger and a digital pencil can help individuals complete drawing activities effortlessly on touchscreen devices, there is no guarantee that they show the same effect on learning, which should be further tested.Objectives This study paid attention to the influence of drawing mode on learning processes and outcomes.Methods By means of the eye tracking technique, this study recruited college students as participants who were required to learn instructional materials consisting of actual (Experiment 1) or fictitious (Experiment 2) terms and definitions to test the effects of touchscreen-based finger drawing versus pencil drawing on visual attention, learning performance as well as motivation.Results and Conclusions Across both experiments, learners showed more fixation count in areas of interest, and also more transition count between these areas for the finger drawing condition as compared to the pencil drawing condition. Recall performance on the studied definitions in the finger drawing condition was better than that in the pencil drawing condition. However, learners were subjectively less motivated to use a finger to draw than a digital pencil.Implications These findings show contributions to the emphasis of importance of drawing mode when the generative drawing activity is applied to touchscreens.
期刊:
Journal of Hazardous Materials,2024年465:133172 ISSN:0304-3894
通讯作者:
Zhou, Zhongxin
作者机构:
[Wei, Jingjing; Zhou, Yuanfei; Hu, Yanping; Wei, Hongkui; Peng, Jian] Department of Animal Nutrition and Feed Science, College of Animal Sciences & Technology, Huazhong Agricultural University, Wuhan 430070, China;[Yuan, Yongze] Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan 430079, China;[Xiong, Juan; Xiao, Naidong] College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China;[Ren, Zhuqing] Frontiers Science Center for Animal Breeding and Sustainable Production, Hubei Hongshan Laboratory, Huazhong Agricultural University, WuHan 430070, China;[Cui, Changzheng] State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
通讯机构:
[Zhou, Zhongxin] D;Department of Animal Nutrition and Feed Science, College of Animal Sciences & Technology, Huazhong Agricultural University, Wuhan 430070, China. Electronic address:
关键词:
Antibiotic alternatives;Antibiotic resistance genes;Layer feces;Microbiome;Mobile genetic elements
摘要:
Although antibiotic alternatives are widely used in livestock and poultry breeding industry after in-feed antibiotics ban, their intervention effects on antibiotic resistance genes (ARGs) in these food animals' feces remain poorly understood. Here effects of fructooligosaccharide (FOS) and astragalus polysaccharide (APS), as typical antibiotic alternatives in China, on ARGs in layer feces were estimated by performing metagenomic sequencings and fluorescence quantitative PCR. Fructooligosaccharide significantly reduced sum abundance of ARGs and mobile genetic elements (MGEs) by increasing Lactobacillus clones and reducing Escherichia clones which had relatively higher abundances of ARG subtypes and MGE subtypes in layer feces. However, at least parts of core ARGs and MGEs categories were not reduced by FOS, such as aminoglycosides- and tetracyclines-resistant genes, Tn916, Integrase, and so on. MGEs and microbiome, especially Escherichia genus and Lactobacillus genus, were the key factors affecting ARGs' sum abundance. MGEs had a higher correlation coefficient with ARGs' sum abundance than Escherichia genus and Lactobacillus genus. These findings firstly reveal the defects of antibiotic alternatives in controlling bacterial resistance in livestock and poultry breeding after in-feed antibiotics ban, and more strategies are needed to control pollutions and risks of core ARGs and MGEs in food animals' feces under a special environment.
期刊:
Journal of Soils and Sediments,2024年 ISSN:1439-0108
通讯作者:
Tian, P
作者机构:
[Ping, Yaodong; Tian, Pei; Guo, Yahui; Tian, P] Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan 430079, Peoples R China.;[Luo, Li] Northwest Agr & Forestry Univ, Coll Water Resources & Architectural Engn, Yangling 712100, Peoples R China.;[Zhu, Zhanliang; Gong, Yuwei] Beijing Normal Univ, Coll Water Sci, Beijing 100091, Peoples R China.;[Cui, Yongsheng] Fujian Agr & Forestry Univ, Forestry Coll, Fuzhou 350002, Peoples R China.;[Chen, Lin] Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA.
通讯机构:
[Tian, P ] C;Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan 430079, Peoples R China.
关键词:
Soil erosion sensitivity;RUSLE;Deep learning-LSTM model;Geographic detector;Hilly areas of Hubei Province
摘要:
Purpose Hilly areas are highly susceptible to soil erosion. This study aims to discover the drivers of soil erosion, identify soil erosion-sensitive areas, and predict future soil erosion in typical hilly areas of Hubei Province, China, using combined RUSLE and LSTM models.Materials and methods In this study, soil erosion in hilly areas of Hubei Province from 2000 to 2020 was quantitatively analyzed using the revised universal soil loss equation (RUSLE), and the soil erosion sensitivity evaluation system was constructed, a geographic detector was employed to identify the main drivers of soil erosion sensitivity, and using the long short-term memory neural network model (LSTM) to predict soil erosion in 2025.Results and discussions The results showed that most areas were dominated by slight and moderate erosion. Slope and vegetation coverage were identified as the core elements influencing the space heterogeneity of soil erosion. Soil erosion sensitivity was mainly composed of moderate sensitivity, accounting for more than 70% of the total area. The strong and extreme sensitivity demonstrated a downward trend with the continued implementation of slope management and forest rehabilitation from slope agriculture, whereas the sensitivity was still higher in the northwest and southwest Hubei Province. Regions with severe soil erosion had high sensitivity, and the spatial distribution of the two is strongly coherent. Areas with surface relief > 300 m and vegetation cover < 30% had the highest sensitivity and should be highly valued. The percentage of moderate and higher soil erosion area in 2025 was 3.77% lower than in 2020, but severe erosion still exists in the northwest and southwest Hubei Province.Conclusions Soil erosion sensitivity in the western part of the study area was the highest, followed by the southeast, and the overall erosion sensitivity was gradually decreasing during the studied period. In the future, soil erosion intensity will show a downward trend, whereas the deployment of soil and water conservation measures in soil erosion-sensitive areas should still be strengthened. The results are helpful for accurate soil erosion control and prediction in the hilly areas of Hubei Province, China.
期刊:
Journal of Materials Chemistry C,2024年 ISSN:2050-7526
通讯作者:
Tang, YW;Shi, Y
作者机构:
[Chen, Mingyue; Tang, Yiwen; Ran, Hongbing; Wu, Tong; Tang, YW] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Chen, Junfeng; Shi, Y; Shi, Yun; Zheng, Jiaqian; Li, Xiang] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 201899, Peoples R China.;[Chen, Junfeng; Shi, Y; Shi, Yun] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China.;[Wu, Haodi] Huazhong Univ Sci & Technol, WNLO, Wuhan 430074, Peoples R China.;[Wu, Haodi] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China.
通讯机构:
[Shi, Y ; Tang, YW ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 201899, Peoples R China.;Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China.
摘要:
Ternary copper halides, such as Cs3Cu2I5, as an emerging class of nontoxic alternatives to lead halide perovskites, have drawn extensive attention in the X-ray detection field due to their efficient self-trapped exciton emissions. However, the light yield far below the theoretical limit seriously hinders the high-resolution X-ray detection application of copper halide scintillators. Herein, Cs3Cu2I5:K+ scintillation films and single crystals with enhanced photoluminescence (PL) and radiation luminescence (RL) were first obtained by adjusting the doping concentration of K+ ions in the 0-8 at% range. The substitution of Cs+ by doping K+ compacted the adjacent [Cu2I5](3-) dimer groups, resulting in a stronger exciton-photon coupling strength. Therefore, Cs3Cu2I5:K+ single crystals exhibited a stronger RL emission under X-ray excitation, and their light output was about 49.6% higher than that of the pure Cs3Cu2I5, with an accelerated scintillation decay time (330 to 241 ns). Benefiting from these advantages, X-ray detectors based on hydrophobic polymethyl methacrylate (PMMA)-coated Cs3Cu2I5:K+ flexible films could deliver a higher X-ray imaging resolution of 11.7 lp mm(-1)@MTF = 0.2 in comparison with the commercial gadolinium oxysulfide (GOS)-based detectors (6.2 lp mm(-1)@MTF = 0.2). This work provides insights for the design of metal halides for use in low-cost and high-resolution flexible X-ray imaging systems.
摘要:
Ureas are widely used in drugs, materials and catalysts because of their diamide structure, which can form strong hydrogen bonds. Therefore, it is of great scientific significance to develop efficient and green methods for the synthesis of urea compounds, especially unsymmetrical ureas. Here, we have disclosed novel and highly efficient three-component coupling reactions of organic halides, sodium cyanate and amines enabled by nickel/photoredox dual catalysis for the preparation of unsymmetrical ureas. The reaction features simple and safe operations, broad substrate scopes, and product diversities. It allows the facile synthesis of N-aryl/vinyl ureas from readily available, user-friendly feedstocks under mild conditions (27 examples, 36%-98% yields). In addition, this method is further derived to alcohols as nucleophiles to synthesize a series of carbamates (15 examples, 40%-95% yields). The mechanism experiment shows that the isocyanate produced by the coupling of halide and sodium cyanate may be the key intermediate in this reaction.
期刊:
Physical Chemistry Chemical Physics,2024年26(1):130-143 ISSN:1463-9076
通讯作者:
Zhao, YJ
作者机构:
[Zhao, Yunjie; Zeng, Chengwei; Li, Anbang; Zhuo, Chen] Cent China Normal Univ, Inst Biophys, Wuhan 430079, Peoples R China.;[Zhao, Yunjie; Zeng, Chengwei; Li, Anbang; Zhuo, Chen] Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.;[Jian, Yiren] Dartmouth Coll, Dept Comp Sci, Hanover, NH 03755 USA.;[Zeng, Chen] George Washington Univ, Dept Phys, Washington, DC 20052 USA.
通讯机构:
[Zhao, YJ ] C;Cent China Normal Univ, Inst Biophys, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
摘要:
Biological processes such as transcription, repair, and regulation require interactions between DNA and proteins. To unravel their functions, it is imperative to determine the high-resolution structures of DNA-protein complexes. However, experimental methods for this purpose are costly and technically demanding. Consequently, there is an urgent need for computational techniques to identify the structures of DNA-protein complexes. Despite technological advancements, accurately identifying DNA-protein complexes through computational methods still poses a challenge. Our team has developed a cutting-edge deep-learning approach called DDPScore that assesses DNA-protein complex structures. DDPScore utilizes a 4D convolutional neural network to overcome limited training data. This approach effectively captures local and global features while comprehensively considering the conformational changes arising from the flexibility during the DNA-protein docking process. DDPScore consistently outperformed the available methods in comprehensive DNA-protein complex docking evaluations, even for the flexible docking challenges. DDPScore has a wide range of applications in predicting and designing structures of DNA-protein complexes. Biological processes such as transcription, repair, and regulation require interactions between DNA and proteins.
期刊:
Journal of Computer Assisted Learning,2024年 ISSN:0266-4909
通讯作者:
Wei, YT
作者机构:
[Shi, Yafei; Cheng, Qi] Henan Normal Univ, Fac Educ, Xinxiang, Peoples R China.;[Yao, Huang; Wei, Yantao; Tong, Mingwen] Cent China Normal Univ, Fac Artificial Intelligence Educ, Wuhan, Peoples R China.;[Wei, YT; Wei, Yantao] Cent China Normal Univ, Fac Artificial Intelligence Ineduc, 152 Luoyu Rd, Wuhan 430079, Peoples R China.
通讯机构:
[Wei, YT ] C;Cent China Normal Univ, Fac Artificial Intelligence Ineduc, 152 Luoyu Rd, Wuhan 430079, Peoples R China.
关键词:
basic psychological needs;distance education;engagement;self-system model of motivational development;video conferencing learning
摘要:
BackgroundVideo conferencing learning offers a more accessible and flexible learning mode for students who cannot attend face-to-face class in person. However, research about the video conferencing learning is still lacked, especially for students' engagement in this setting.ObjectivesThis study adopts the self-system model of motivational development to uncover effects of the video conferencing learning environment (VCLE) to students' engagement.MethodsTwo hundred and ninety-eight primary school students involved in the VCLE were surveyed. The partial least square structural equation modelling was employed to explore the link between the VCLE and students' engagement with a mediating role of basic psychological needs satisfaction (BPNS).Results and ConclusionsResults showed that the BPNS played a mediating role in the processes from the VCLE to engagement. Both pedagogical and social affordance had a significant effect on the BPNS. However, their influences were different. Specifically, pedagogical affordance yielded a stronger effect on the BPNS for autonomy than social affordance. The predicting power of social affordance on BPNS for relatedness and competence was stronger than pedagogical affordance. Generally, social affordance yielded more contributions to behavioral and emotional engagement than pedagogical affordance. Moreover, BPNS for competence was the only significant mediator between the VCLE and behavioral engagement, and it owned the strongest mediating power on the relationship between the VCLE and emotional engagement, followed by autonomy, and the smallest of relatedness. This study suggests that practitioners and researchers should give more consideration to improve social affordance of the VCLE and to meet students' BPNS especially for competence in order to design and implement an engaged video conferencing course. What is already known about this topicVideo conferencing learning provides an accessible and flexible learning mode.Mechanism from learning environment to engagement is helpful to design an engaged video conferencing course.Less is known about how video conferencing learning affects students' engagement.This study uncovered the functioning process of video conferencing learning to students' engagement.PLS-SEM was employed to verify the mediating role of BPNS in this process.BPNS for autonomy, competence, and relatedness played mediating roles and their powers were different.Implications for practice and/or policyMore attention is needed to improve to social affordance to enhance students' emotional engagement.BPNS especially for competence deserves special consideration to improve students' behavioral and emotional engagement.
期刊:
Education and Information Technologies,2024年 ISSN:1360-2357
通讯作者:
Liu, Jiaxu;Liu, QT
作者机构:
[Liu, Jiaxu; Ma, Jingjing; Liu, Qingtang; Yu, Shufan; Wu, Linjing] Cent China Normal Univ, Fac Artificial Intelligence Educ, Wuhan, Peoples R China.;[Liu, Jiaxu; Ma, Jingjing; Liu, Qingtang; Yu, Shufan; Wu, Linjing] Cent China Normal Univ, Hubei Res Ctr Educ Informationizat, Wuhan, Peoples R China.;[Liu, Mengfan] Hongxing Expt Sch, Shenzhen, Guangdong, Peoples R China.
通讯机构:
[Liu, JX; Liu, QT ] C;Cent China Normal Univ, Fac Artificial Intelligence Educ, Wuhan, Peoples R China.;Cent China Normal Univ, Hubei Res Ctr Educ Informationizat, Wuhan, Peoples R China.
摘要:
Virtual reality learning environment (VRLE), which allow students to transcend time and space and provide them with a sense of immersion, is becoming more common in education. Although many studies have explored the effects of VRLE on learners' learning outcomes as well as learning experiences, the results of these studies indicate that the effects of VRLE on learning outcomes and cognitive load are mixed. This is influenced by multiple factors that can be broadly grouped into two categories: learner characteristics and VRLE features. This study aimed to investigate how the autonomy of VRLE and learner characteristics affect learning in the VRLE. 94 volunteered students (aged 18 to 26) were randomly assigned to a high-autonomy VRLE (N = 47) or a low-autonomy VRLE (N = 47). We did a fuzzy-set qualitative comparative analysis (fsQCA) and discovered that VRLE is not good for all students but only for those with particular features. According to the findings, teachers should personalize their use of instructional technology depending on the profiles of their students.
期刊:
Science of The Total Environment,2024年907:168094 ISSN:0048-9697
通讯作者:
Shen, Jianlin
作者机构:
[Wu, Jinshui; Jiang, Wenqian; Gong, Dianlin; Zhu, Qihong; Wang, Juan; Zhu, Xiao; Shen, Jianlin] Key Laboratory for Agro-ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;[Wu, Jinshui; Jiang, Wenqian; Gong, Dianlin; Zhu, Qihong; Wang, Juan; Zhu, Xiao; Shen, Jianlin] Changsha Research Station for Agricultural & Environmental Monitoring, Chinese Academy of Sciences, Changsha 410125, China;[Wu, Jinshui; Jiang, Wenqian; Zhu, Qihong] University of Chinese Academy of Sciences, Beijing 100049, China;[Shen, Jianlin] University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: jlshen@isa.ac.cn;[Li, Yong] University of Chinese Academy of Sciences, Beijing 100049, China
通讯机构:
[Shen, Jianlin] U;University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address:
摘要:
Over the past decade, China has experienced a decline in atmospheric reactive nitrogen (Nr) emissions. Given that China's subtropical region is a significant nitrogen (N) deposition hotspot, it is essential to accurately quantify the ten-year variations in dry and wet N depositions in the context of reductions in atmospheric Nr emissions. Here, we evaluated the spatiotemporal variation in N deposition on forest, paddy field and tea field ecosystems in a typical subtropical agricultural catchment from 2011 to 2020. Our findings indicated a significant decrease in total N deposition in both the tea field ecosystem (41.5-30.5kgNha(-1)) and the forest ecosystem (40.8-25.7kgNha(-1)) (P<0.05), but no significant change in the paddy field ecosystem (29.3-32.9kgNha(-1)). Specifically, dry N deposition exhibited significant declines except in the paddy field ecosystem, whereas wet N deposition had no significant change. The reduction in total oxidized and reduced N depositions in forest and tea field ecosystems is attributed to the decrease in NO(x) and NH(3) emissions. Additionally, The ratio of NH(x) deposition to total N deposition all exceeded 0.5 in three ecosystems and the NH(x)/NO(y) ratio had an increasing trend (P<0.05) in the paddy field, indicating that reactive N emissions from agricultural sources were the primary contributor to overall N deposition. Our study emphasizes that despite the decreasing trend in N deposition, it still exceeds the critical loads of natural ecosystems and requires stringent N emissions control, particularly from agricultural sources, in the future.
作者机构:
[Duan, Fangfang; Peng, Xiaogang; Jin, An; Liu, Lin] School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Wuhan, 430030, People's Republic of China;[Duan, Fangfang] Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, People's Republic of China;[Meng, Xianggao] College of Chemistry, Central China Normal University, Wuhan, 430079, People's Republic of China;[Jin, An] School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua, 418000, People's Republic of China. Electronic address: 3405004@qq.com;[Ruan, Hanli] School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Wuhan, 430030, People's Republic of China. Electronic address: ruanhl@mails.tjmu.edu.cn
通讯机构:
[Jin, An; Ruan, Hanli] S;School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua, 418000, People's Republic of China. Electronic address:;School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Wuhan, 430030, People's Republic of China. Electronic address:
摘要:
Ten previously unreported [11]-chaetoglobosins, chaepseubakerins A-J (1-10), were characterized from the solid rice-based culture of Pseudeurotium bakeri P1-1-1, an endophyte harbored in the roots of Macrocoma tenue subsp. sullivantii Vitt. (Orthotrichaceae). Their structures were determined by spectroscopic analysis, single-crystal X-ray diffraction (Cu Kα radiation), and chemical methods. Chaepseubakerin A (1) exhibited significant cytotoxic effects against seven human cancer cell lines, A549, A427, HCT116, HT-29, HeLa, HepG2, and MCF-7, with IC(50) values of 2.9, 3.0, 4.0, 4.4, 7.1, 6.7, and 8.9μM, respectively. Mechanistically, 1 induced G2/M cell cycle arrest and apoptosis in A549, Hela, and HCT116cells in a dose dependent manner.
期刊:
ACM Transactions on Information Systems,2024年42(2):1–28 ISSN:1046-8188
作者机构:
[Sannyuya Liu; Shengyingjie Liu; Zongkai Yang; Jianwen Sun; Xiaoxuan Shen; Qing Li; Rui Zou; Shangheng Du] Central China Normal University, China
关键词:
dynamic graph;Intelligent education;heterogeneous information network;graph embedding;knowledge tracing
摘要:
Graph embedding (GE) aims to acquire low-dimensional node representations while maintaining the graph’s structural and semantic attributes. Intelligent tutoring systems (ITS) signify a noteworthy achievement in the fusion of AI and education. Utilizing GE to model ITS can elevate their performance in predictive and annotation tasks. Current GE techniques, whether applied to heterogeneous or dynamic graphs, struggle to efficiently model ITS data. The GEs within ITS should retain their semidynamic, independent, and smooth characteristics. This article introduces a heterogeneous evolution network (HEN) for illustrating entities and relations within an ITS. Additionally, we introduce a temporal extension graph neural network (TEGNN) to model both evolving and static nodes within the HEN. In the TEGNN framework, dynamic nodes are initially improved over time through temporal extension (TE), providing an accurate depiction of each learner’s implicit state at each time step. Subsequently, we propose a stochastic temporal pooling (STP) strategy to estimate the embedding sets of all evolving nodes. This effectively enhances model efficiency and usability. Following this, a heterogeneous aggregation network is devised to proficiently extract heterogeneous features from the HEN. This network employs both node-level and relation-level attention mechanisms to craft aggregated node features. To emphasize the superiority of TEGNN, we perform experiments on several real ITS datasets and show that our method significantly outperforms the state-of-the-art approaches. The experiments validate that TE serves as an efficient framework for modeling temporal information in GE, and STP not only accelerates the training process but also enhances the resultant accuracy.