作者机构：
[Wu, Yi-jin; Wang, Si-ping; Liu, Wan-xin; Zhou, Xiao; Wu, YJ; Li, Yi; Tan, Liang] Hengyang Normal Univ, Coll Chem & Mat Sci, Hunan Engn Res Ctr Monitoring & Treatment Heavy Me, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421001, Peoples R China.;[Zhou, Yao; Zhou, Y] Xiamen Univ, Coll Energy, Xiamen 361005, Peoples R China.;[Tu, Teng-xiu] Chinese Acad Sci, Inst Solid State Phys, Hefei Inst Phys Sci, Hefei 230031, Peoples R China.;[Zhang, Peng-fang] Liaocheng Univ, Sch Chem & Chem Engn, Shandong Prov Key Lab Chem Energy Storage & Novel, Liaocheng 252000, Peoples R China.
通讯机构：
[Wu, YJ ] H;[Zhou, Y ] X;Hengyang Normal Univ, Coll Chem & Mat Sci, Hunan Engn Res Ctr Monitoring & Treatment Heavy Me, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421001, Peoples R China.;Xiamen Univ, Coll Energy, Xiamen 361005, Peoples R China.
摘要：
Different from the conventional Zinc-Air batteries which only involves oxygen reduction and evolution (ORR/ OER) in the cathode, the cathode of rechargeable zinc-air/iodide hybrid batteries (ZAIHBs), with the addition of I- species, involves I- electrooxidation (IOR) during charging and oxygen/iodate reduction (ORR and IDR) during discharging. This work reports the synthesis of a hierarchically porous tungsten-based nitrogen-doped carbon framework (W/N/C) with abundant WNx active sites and numerous ultrafine WN nanoclusters and explores their application as a trifunctional IOR/ORR/IDR electrocatalyst for ZAIHBs. The formation mechanism of ZIF-8-derived W/N/C framework as well as its structural and compositional features were investigated. The catalyst demonstrates high trifunctional catalytic activity and robust durability towards IOR/ORR/IDR in alkaline condition, owing to the uniform copresence of the numerous sub-nanometer-sized WN nanoclusters and the abundant single atom WNx sites in the hierarchically structured carbon framework. When applied in homemade ZAIHBs, it revealed a high peak energy density (141.9 mW cm-2) and remarkable cycling stability (65 h), outperforming the commercial Pt/C catalysts. This work demonstrates the multi-functional electrocatalytic activity of tungsten-based non-noble metal electrocatalyst for high-performance ZAIHBs.
期刊：
Environmental Geochemistry and Health,2024年46(1):1-15 ISSN：0269-4042
通讯作者：
Zhou, DS
作者机构：
[Huang, Zhigang; Xiao, Ye; Long, Jiumei; Zhou, Dongsheng; Xiao, Hanxi] Zunyi Normal Univ, Coll Resources & Environm, Zunyi 563006, Peoples R China.;[Long, Jiumei; Huang, Binyan] Hengyang Normal Univ, Coll Life Sci, Hengyang 421008, Peoples R China.;[Tan, Di] Changde Ecol Environm Bur, Changde 415000, Peoples R China.
通讯机构：
[Zhou, DS ] Z;Zunyi Normal Univ, Coll Resources & Environm, Zunyi 563006, Peoples R China.
关键词：
Antimony and arsenic contamination;Soil washing;Agricultural soil;Bioavailability
摘要：
Antimony (Sb) and arsenic (As) contamination in agricultural soil poses human health risks through agricultural products. Soil washing with degradable low molecular weight organic acids (LMWOAs) is an eco-friendly strategy to remediate agricultural soils. In this study, three eco-friendly LMWOAs, oxalic acid (OA), tartaric acid (TA), and citric acid (CA), were used to treat Sb and As co-contaminated agricultural soil from Xikuangshan mine area. The OA, TA, and CA washed out 18.4, 16.8, and 26.6% of Sb and 15.3, 19.9, and 23.8% of As from the agricultural soil, with CA being the most efficient reagent for the soil washing. These organic acids also led to pH decline and macronutrients losses. Fraction analysis using a sequential extraction procedure showed that the three organic acids targeted and decreased the specifically sorbed (F2) (by 19.3-37.6% and 2.41-23.5%), amorphous iron oxide associated (F3) (by 49.1-61.2% and 51.2-70.2%), and crystallized iron oxide associated (F4) (by 12.3-26.0% and 26.1-29.1%) Sb and As. The leachability of Sb and As, as well as their concentrations and bioconcentration factor (BCF) in vegetables reduced due to the soil washing. It demonstrated that the bioavailability of both the elements was decreased by the organic acids washing. The concentrations of Sb and As in typical vegetable species cultivated in CA washed soil were less than the threshold value for consumption safety, while those in OA and TA washed soils were still higher than the value, suggesting that only CA is a potential washing reagent in soil washing for Sb- and As-contaminated agricultural soil.
通讯机构：
[Zhao, HH ] H;Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang 421002, Hunan, Peoples R China.
关键词：
Talking face generation;Lip sync;Face motion;Virtual reality;Multimodality
摘要：
In this paper, we present TellMeTalk, an innovative approach for generating expressive talking face videos based on multimodal inputs. Our approach demonstrates robustness across various identities, languages, expressions, and head movements. It overcomes four key limitations of existing talking face video generation methods: (1) reliance on single -modal learning from audio or text, lacking the complementary nature of multimodal inputs; (2) deployment of traditional convolutional neural network generation, leading to restricted capture of spatial features; (3) the absence of natural head movements and expressions; and (4) limitations of artifacts, prominent boundaries caused by image overlapping, and unclear mouth regions. To address these challenges, we propose a face motion network to imbue character images with facial expressions and head movements. We also take text and reference audio as input to generate personalized audio. Furthermore, we introduce a generator equipped with a crossattention module and Fast Fourier Convolutional blocks to model spatial dependencies. Finally, a face restoration module is designed to reduce artifacts and prominent boundaries. Extensive experiments demonstrate our method produces high -quality expressive talking face videos. Compared to state-of-the-art approaches, our method exhibits superior performance in terms of video quality and precise synchronization of lip movements. The source code is available at https://github.com/lifemo/TellMeTalk.
通讯机构：
[Chen, Z ] H;Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang 421002, Peoples R China.;Hunan Prov Key Lab Intelligent Informat Proc & App, Hengyang 421002, Peoples R China.
关键词：
color image encryption;hyperchaotic system;region of interest;security analysis
摘要：
The significance of safeguarding the security of image information has escalated significantly, owing to the exponential proliferation of digital images containing sensitive information being disseminated on the Internet. In this paper, we first propose a novel 4D hyperchaotic system and design a new image encryption algorithm in conjunction with the hyperchaotic system. The algorithm uses a split random swap permutation method to permute the image and combines the S-box to diffuse the image. To improve the diffusivity of this encryption algorithm, a cross-random diffusion method is designed to diffuse the image again. Then, we propose a region of interest (ROI) encryption scheme for images. This scheme can automatically identify irregular privacy targets in images and encrypt them. To ensure the security of the region of interest location information during transmission, the scheme compresses the location information of the privacy target using a run-length encoding technique and then embeds the compressed data into the ciphertext image using reversible steganography based on histogram shift. The experimental results and security analysis unequivocally demonstrate that the image encryption algorithm proposed in this paper exhibits robust resistance against a wide array of attacks, thereby ensuring a high level of security. Additionally, the devised image ROI encryption scheme effectively safeguards diverse privacy targets.
期刊：
Psychology in the Schools,2024年61(3):1034-1053 ISSN：0033-3085
通讯作者：
Liu, XH
作者机构：
[Deng, Yu; Chen, Jiajing; Liu, Xianhua; Zheng, Yanli; Lei, Lei] Hengyang Normal Univ, Coll Educ Sci, Hengyang, Hunan, Peoples R China.;[Liu, Xianhua; Liu, XH] Hengyang Normal Univ, Coll Educ Sci, 16 Henghua Rd, Hengyang 421002, Hunan, Peoples R China.
通讯机构：
[Liu, XH ] H;Hengyang Normal Univ, Coll Educ Sci, 16 Henghua Rd, Hengyang 421002, Hunan, Peoples R China.
关键词：
dispositional mindfulness;learning burnout;middle school students;psychological resilience;school-based mindfulness training
摘要：
This study aimed to explore the effectiveness of school-based mindfulness training on learning burnout of Chinese middle school students and the mediating role of psychological resilience between dispositional mindfulness and learning burnout. A cluster randomized controlled trial was conducted with repeated measurement analysis, in which 62 Chinese middle school students in the experimental group received a 10-week school-based mindfulness training. In comparison, 63 students in the control group were randomized to receive no intervention. Learning burnout, dispositional mindfulness, and psychological resilience were measured by Adolescent Student Burnout Inventory, Five Facet Mindfulness Questionnaire, and Resilience Scale for Chinese Adolescents, respectively. The results showed: (1) Compared with the experimental group's pre-test scores and the control group's pretest and posttest scores, the posttest scores of learning burnout in the experimental group significantly decreased. In contrast, the posttest scores of dispositional mindfulness and psychological resilience in the experimental group significantly increased. Meanwhile, the control group gained no significant changes between the pre-and posttest in learning burnout, dispositional mindfulness, and psychological resilience. (2) Dispositional mindfulness was positively related to psychological resilience, while dispositional mindfulness and psychological resilience were negatively associated with learning burnout. (3) The direct effect of dispositional mindfulness on learning burnout and the mediating effect of psychological resilience between dispositional mindfulness and learning burnout were significant. This study suggested that school-based mindfulness training distinctly improves dispositional mindfulness and psychological resilience and alleviates learning burnout in Chinese middle school students. Furthermore, psychological resilience plays a mediating role between dispositional mindfulness and learning burnout.
School-based mindfulness training is an effective intervention method to alleviate learning burnout of Chinese middle school students.
Dispositional mindfulness is a protective factor of learning burnout, and psychological resilience plays a mediating role between dispositional mindfulness and learning burnout.
School-based mindfulness training alleviates learning burnout by improving dispositional mindfulness and psychological resilience.
摘要：
Abstract Understanding how resilient forests are to ecological engineering projects (EEPs) is essential to forest management and ecosystem health. Despite growing evidence that EEPs achieve increasing carbon stocks, whether such benefits can be sustainable and what are the consequences of EEPs on forest health remain unclear. This study aimed to investigate the long‐term effects of EEPs using forest resilience from aspects of resistance and recovery, by applying a change detection algorithm (breaks for additive seasonal and trend; BFAST) spatially on net ecosystem production (NEP) (proxy for carbon stocks) time series (1981–2019) in red soil hilly region (RSHR) of subtropical China. The spatial parameters (e.g., the number, magnitude, and time of changes) used to construct resilience metrics were generated based on BFAST‐derived breakpoints. These metrics were then utilized to analyze the dynamics of forest resilience in relation to EEPs factors in terms of plantation area, forest type, and stand age. Our results observed 92.77% of breakpoints in NEP after 2000, which corresponds well with the periods that multiple EEPs were conducted. NEP resilience showed great variability during 2001–2019, with a positive increasing trend in resistance (R2 = 0.72) and a continuous decline (R2 = 0.37) in recovery, indicating an unhealthy ecosystem in RSHR. Our findings revealed that forest resistance was strongly associated with plantation area (R = 0.71), and the presence of monoculture and young coniferous forest may be the potential factors for the decline in recovery. This suggested that forest resilience in RSHR is mainly modulated by large‐scale EEPs.
期刊：
FRONTIERS IN PSYCHOLOGY,2024年15:1325436 ISSN：1664-1078
通讯作者：
Hu, YQ
作者机构：
[Qi, Qi; Hu, Yiqiu; Liu, Shuangjin; Hu, YQ; Yang, Qin; Wu, Tong; Zeng, Zihao; Wang, Hongcai] Hunan Normal Univ, Sch Educ Sci, Changsha, Peoples R China.;[Wang, Hongcai] Hunan Inst Technol, Sch Elect Informat Engn, Hengyang, Peoples R China.;[Liu, Xianhua] Hengyang Normal Univ, Coll Educ Sci, Hengyang, Peoples R China.;[Hu, Yiqiu; Hu, YQ] Res Ctr Mental Hlth Educ Hunan Prov, Changsha, Peoples R China.;[Hu, Yiqiu; Hu, YQ] Cognit & Human Behav Key Lab Hunan Prov, Changsha, Peoples R China.
通讯机构：
[Hu, YQ ] H;Hunan Normal Univ, Sch Educ Sci, Changsha, Peoples R China.;Res Ctr Mental Hlth Educ Hunan Prov, Changsha, Peoples R China.;Cognit & Human Behav Key Lab Hunan Prov, Changsha, Peoples R China.
关键词：
life events;NSSI;Sleep disturbances;PLEs;college students
摘要：
This study aimed to explore the relationship between life events and non-suicidal self-injury (NSSI) in college students, as well as the mediating effect of sleep disturbances and psychotic-like experiences (PLEs). After excluding invalid questionnaires, 5,754 were retained, and the valid efficiency was 75.94%. The subjects were aged 16 to 29 years (M = 19.166; SD = 1.392), with 1,969 males (34.22%) and 3,785 females (65.78%). Life events, sleep disturbances, PLEs, and NSSI were assessed using standard scales. Data were analyzed by Pearson Correlation Analysis and bias-correction percentile Bootstrap method. The results show that (1) life events were significant positive predictors of NSSI, sleep disturbances, and PLEs; (2) sleep disturbances, PLEs, and the chain mediation between the two, were mediators between life events and NSSI. Life events are thus shown to be an important external factor influencing NSSI in university students, and this process is mediated through sleep disturbances, PLEs, and the chain between the two. Interventions for NSSI can therefore be made by improving college students' sleep quality and reducing PLEs.
摘要：
Soil surface carbon dioxide (CO2) fluxes hold significant implications for comprehending carbon cycling, global climate change, and ecosystem functioning. Accurate understanding and quantification of this flux are crucial for assessing the carbon dynamics of ecosystems and predicting the impacts of climate change. In this study, we analyzed the variation pattern of CO2 concentration within the accumulated chamber from Fick's law, accounting for diffusion gradient effect and considering leakage effect. We developed a simple model to measure the soil surface CO2 flux, and used the model to calculate the values of CO2 fluxes on a specific soil surface. Comparing the fitting results of the proposed nonlinear model with traditional linear models for the measurement data, we found that the linear model underestimated by at least 18%, even up to 45%. Overall, our research indicates that the proposed model exhibits significant advancement and higher predictive reliability, successfully evaluating soil surface CO2 flux.
摘要：
Magnetic skyrmions can be generated, destroyed and driven to motion by electric spin currents in metals based on the spin transfer torque (STT) mechanism. However, the STT technique does not work in insulating materials because no electric currents can pass through. Fortunately, the magnetoelectric (ME) interaction that is present in multiferroic insulators makes it possible to manipulate magnetic skyrmions by applying electric fields. We have recently simulated ferroelectric (FE) skyrmionic crystals (or skyrmionic lattices so that skyrmionic crystals can be abbreviated as SkLs) formed in two-dimensional (2D) ferromagnetic (FM) multiferroic materials. Antiferromagnets are more abundant in nature. For this reason, we employ here a quantum computational method which we have developed in recent years to investigate the magnetic and polarized electric dipole textures of a 2D antiferromagnetic (AM) multiferroic system. Consequently, we observe in simulations that antiferroelectric (AE) and AM skyrmionic crystals can be generated simultaneously in a broad temperature and magnetic field phase region. Each of these AM and AE SkLs can be decomposed into two ferromagnetic or ferroelectric lattices which are FM or FE SkLs respectively, an FE skyrmion in one FE SkL is an electric dipole complex formed around the interstitial site of another FE SkL. The topological charges of the FE skyrmions are quantized to be integers, half integers or the odd multiples of +/- 0.25 especially within subsequently normally applied electric fields. In a strong external magnetic field, AE SkL and AM vortical crystal (VL) usually coexist. A subsequently applied perpendicular electric field is able to stabilize or destroy the both sorts of SkLs, and considerably elevate the coexisting temperatures of the AE SkL and AM VL textures even the electric field is very weak.
摘要：
Phosphorus is widely used in agriculture and industry. However, excessive phosphorus can cause eutrophication in aquatic environment. Therefore, the development of an simple, efficient and economical method for phos-phate removal from wastewater is urgently needed. In this study, calcium aluminum layered double hydroxides (CaAl-LDHs) and six amino acid intercalated calcium aluminum layered double hydroxides (CaAl-amino acid-LDHs) was prepared by a facile method. In order to identify optimal amino acid, the adsorption performance of phosphate for six CaAl-amino acid-LDHs were comparatively studied. A high phosphate adsorption capacity were observed for L-Aspartic acid intercalated calcium aluminum layered double hydroxides (CaAl-Asp-LDHs). Experimental results showed that CaAl-Asp-LDHs can achieve phosphate anion adsorption capacity of 569.95 mg/g, which is significantly higher than that of CaAl-LDHs (236.86 mg/g) at pH 6.0 and favorable selectivity was observed when compared with other common anions. CaAl-Asp-LDHs exhibited a faster phosphate removal than that of CaAl-LDHs. The adsorption data of aqueous phosphate anion using CaAl-LDHs and CaAl-Asp-LDHs could be well described by the Langmuir isotherm model and pseudo-second order kinetics. Furthermore, based on the structural and morphological features, as well as fourier transform infrared spectrometer (FT-IR), diffraction of x-rays (XRD), x-ray photoelectron spectroscopy (XPS), scanning electron microscope with energy dispersive x-ray spectroscopy (SEM-EDS) and element mapping, the phosphate adsorption mechanism on CaAl-Asp-LDHs involved the electrostatic attraction, hydrogen bonds, complexation and ion exchange. Compared with the performance of other phosphate sorbents in other reported, CaAl-Asp-LDHs has the highest adsorption value. The synthesized CaAl-Asp-LDHs, therefore, would be a promising environmentally friendly material for the efficient removal of phosphate from aquatic environments.
摘要：
Hair editing is challenging due to the complexity and variety of hair materials and shapes. Existing methods employ reference images or user-painted masks to edit hair and have achieved promising results. However, discrepancies in color and shape between the source and target hair can occasionally result in unrealistic results. Therefore, we propose a new hair editing method named HairManip, which decouples the hair information from the input source image into shape and color components. We then train hairstyle and hair color editing sub-networks to handle this complex information independently. To further enhance editing efficiency and accuracy, we introduce a latent code preprocessing module that effectively extracts meaningful features from hair regions, thereby improving the model’s editing capabilities. The experimental results demonstrate that our method achieves significant results in editing accuracy and authenticity, thanks to the carefully designed network structure and loss functions. Code can be found at https://github.com/Zlin0530/HairManip .
作者机构：
[Jiang, Chunli; Li, Bo; Lin, Hechun; Luo, CH; Xu, Linlin; Wu, Zhixian; Luo, Chunhua; Peng, Hui; Peng, H] East China Normal Univ, Dept Elect, Key Lab Polar Mat & Devices MOE, Shanghai 200241, Peoples R China.;[Jiang, Chunli; Peng, Hui] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Shanxi, Peoples R China.;[Liu, Mengqin] Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Hunan, Peoples R China.;[Liu, Weimin] ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China.
通讯机构：
[Luo, CH ; Peng, H] E;East China Normal Univ, Dept Elect, Key Lab Polar Mat & Devices MOE, Shanghai 200241, Peoples R China.
关键词：
blue PeLEDs;defect passivation;interfacial effect;phase distribution;quasi-2D perovskites
摘要：
Although tremendous advances have recently been achieved in perovskite light-emitting diodes (PeLEDs), development of the blue PeLEDs needed to achieve full-color displays is far behind the red and green counterparts. Here, a simple and effective interface engineering strategy is reported to achieve efficient blue PeLEDs by modifying poly(3, 4-ethylene dioxythiophene):polystyrene sulfonic (PEDOT:PSS) substrate with an amphiprotic molecule glycine. As a multifunctional additive, glycine can not only modulate the pH of PEDOT:PSS, but also trigger strong interfacial effect. Cooperative coordination and hydrogen bonding interactions between glycine and perovskite at the interface can passivate the interfacial defects and manipulate upper perovskite crystallization. Therefore, high-quality perovskite films with grade-distributed phases are obtained, enabling efficient cascade energy transfer and suppression of leakage current. The resulting PeLED exhibits the electroluminescence (EL) peak at 473 nm with a maximum external quantum efficiency (EQE) of 7.2%, which is approximate to 5.5 times that of the unmodified device. Realizing the regulation of low-dimensional phase distribution of quasi-2D perovskites through interfacial effect provides a reliable way to fabricate efficient blue PeLEDs. Perovskite light-emitting diodes (PeLEDs) are promising candidates for the next generation of high-definition displays and solid-state lighting. However, development of the blue PeLEDs needed to achieve full-color displays is far behind the red and green counterparts. This work reports a simple and effective interface engineering strategy to achieve an efficient blue PeLED with an emission wavelength of 473 nm.image
摘要：
Direct Synthesis of Phosphoryltriacetates from White Phosphorus via Visible Light Catalysis: The reaction of P4 with α‐bromo esters using fac‐Ir(ppy)3 as the photocatalyst and blue LEDs (456 nm) as the light source was developed for the first time to afford a series of phosphoryltriacetates. This approach features mild reaction conditions and simple operational process without chlorination. Abstract Organophosphorus compounds (OPCs) are widely used in many fields. However, traditional synthetic routes in the industry usually involve multistep and hazardous procedures. Therefore, it's of great significance to construct such compounds in an environmentally‐friendly and facile way. Herein, a photoredox catalytic method has been developed to construct novel phosphoryltriacetates. Using fac‐Ir(ppy)3 (ppy=2‐phenylpyridine) as the photocatalyst and blue LEDs (456 nm) as the light source, white phosphorus can react with α‐bromo esters smoothly to generate phosphoryltriacetates in moderate to good yields. This one‐step approach features mild reaction conditions and simple operational process without chlorination.
通讯机构：
[Yu, XZ ] H;Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang 421002, Peoples R China.;Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & App, Hengyang 421002, Peoples R China.
关键词：
Deep learning;rice diseases and pests;image recognition;object detection
摘要：
In rice production, the prevention and management of pests and diseases have always received special attention. Traditional methods require human experts, which is costly and time-consuming. Due to the complexity of the structure of rice diseases and pests, quickly and reliably recognizing and locating them is difficult. Recently, deep learning technology has been employed to detect and identify rice diseases and pests. This paper introduces common publicly available datasets; summarizes the applications on rice diseases and pests from the aspects of image recognition, object detection, image segmentation, attention mechanism, and few -shot learning methods according to the network structure differences; and compares the performances of existing studies. Finally, the current issues and challenges are explored from the perspective of data acquisition, data processing, and application, providing possible solutions and suggestions. This study aims to review various DL models and provide improved insight into DL techniques and their cutting -edge progress in the prevention and management of rice diseases and pests.
作者机构：
[Hu, Yong; Fu, Jing; Liu, Jianxiong; Yang, Liguo; Deng, Yunyuan; Su, Baoling] Hengyang Normal Univ, Coll Geog & Tourism, Hengyang, Hunan, Peoples R China.;[Fu, Jing; Yang, Liguo; Deng, Yunyuan] Hengyang Normal Univ, Hunan Natl Local Joint Engn Lab Digital Preservat, Hengyang, Hunan, Peoples R China.;[Fu, Jing; Qin, Jianxin] Hunan Normal Univ, Hunan Key Lab Geospatial Big Data Min & Applicat, Changsha, Hunan, Peoples R China.;[Fu, Jing; Yang, Liguo; Deng, Yunyuan] UNESCO, Int Ctr Space Technol Nat & Cultural Heritage HIST, Hengyang Base, Hengyang, Hunan, Peoples R China.;[Zhang, Zhongbo] Hunan Weather Modificat Off, Changsha, Hunan, Peoples R China.
通讯机构：
[Fu, J ] H;Hengyang Normal Univ, Coll Geog & Tourism, Hengyang, Hunan, Peoples R China.;Hengyang Normal Univ, Hunan Natl Local Joint Engn Lab Digital Preservat, Hengyang, Hunan, Peoples R China.;Hunan Normal Univ, Hunan Key Lab Geospatial Big Data Min & Applicat, Changsha, Hunan, Peoples R China.;UNESCO, Int Ctr Space Technol Nat & Cultural Heritage HIST, Hengyang Base, Hengyang, Hunan, Peoples R China.
摘要：
Abstract Vegetation plays a crucial role in nature, with intricate interactions between it and the geographical environment. The Yangtze River Basin (YRB) refers to the third largest river basin globally and an essential ecological security barrier in China. Monitoring vegetation dynamics in the basin is of profound significance for addressing climate change, soil erosion, and biodiversity loss in the basin's ecosystems. Here, we investigate the spatiotemporal variations of vegetation at both the basin and land cover scales in the YRB from 2000 to 2020. We elucidate the determinants driving the changes and explore future normalized difference vegetation index (NDVI) trends. The results indicate that NDVI in the YRB increased at a rate of 0.0032 year−1 (p < 0.01) over the past 21 years, and it is anticipated to maintain an upward trend in the future. Regions in the upper and middle reaches of the YRB demonstrated higher NDVI, whereas regions in the headwater area and the lower reaches showed lower NDVI. Significant vegetation improvement was primarily concentrated in the central part of the basin, while noticeable vegetation degradation was observed in the eastern region. Temperature and wind speed were identified as the primary controlling factors affecting vegetation greenness. Global‐scale climate oscillations played a significant role in driving periodic variations in NDVI, with La Niña events tending to increase NDVI, while El Niño events hindered its rise. Land cover types were influenced by long‐term interactions between natural factors and human activities, although short‐term vegetation variations might be more affected by the latter. Our findings provide valuable insights into the mechanisms behind vegetation variability driven by multiple variables, and the strong vegetation carbon sink capacity advances the conservation and development of ecosystems.
通讯机构：
[Chen, Z ] H;Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang 421002, Peoples R China.;Hunan Prov Key Lab Intelligent Informat Proc & App, Hengyang 421002, Peoples R China.
关键词：
fractional order;hyperchaotic system;image encryption;knight tour algorithm
摘要：
The security guarantee of data transmission is becoming more crucial as the frequency of information interchange rises. Ensuring the security of images is essential since they serve as a vital transmission medium. This research suggests an image encryption method that combines the knight tour algorithm with a 6D fractional order hyperchaotic system. First, chaotic sequences are produced using a fractional order hyperchaotic system, which is then utilized to index order and jumble the entire image. To retrieve the image after the second scrambling, choose the knight tour beginning point and run ten rounds of knight tour algorithms on the scrambled image. Thirdly, to maximize the efficiency of picture encryption, employ diffusion methods. The outcomes of the imaging experiment were lastly tested and assessed. The security of the image can be successfully guaranteed by a high-dimensional fractional order hyperchaotic system. This is because its high dimensionality gives it a larger key space than the low dimensional system. This is why it can resist attacks more effectively. After a series of evaluation experiments, it is obvious that this encryption scheme has good encryption performance.
