摘要：
The accurate estimation of forest aboveground biomass is of great significance for forest management and carbon balance monitoring. Remote sensing instruments have been widely applied in forest parameters inversion with wide coverage and high spatiotemporal resolution. In this paper, the capability of different remote-sensed imagery was investigated, including multispectral images (GaoFen-6, Sentinel-2 and Landsat-8) and various SAR (Synthetic Aperture Radar) data (GaoFen-3, Sentinel-1, ALOS-2), in aboveground forest biomass estimation. In particular, based on the forest inventory data of Hangzhou in China, the Random Forest (RF), Convolutional Neural Network (CNN) and Convolutional Neural Networks Long Short-Term Memory Networks (CNN-LSTM) algorithms were deployed to construct the forest biomass estimation models, respectively. The estimate accuracies were evaluated under the different configurations of images and methods. The results show that for the SAR data, ALOS-2 has a higher biomass estimation accuracy than the GaoFen-3 and Sentinel-1. Moreover, the GaoFen-6 data is slightly worse than Sentinel-2 and Landsat-8 optical data in biomass estimation. In contrast with the single source, integrating multisource data can effectively enhance accuracy, with improvements ranging from 5% to 10%. The CNN-LSTM generally performs better than CNN and RF, regardless of the data used. The combination of CNN-LSTM and multisource data provided the best results in this case and can achieve the maximum R2 value of up to 0.74. It was found that the majority of the biomass values in the study area in 2018 ranged from 60 to 90 Mg/ha, with an average value of 64.20 Mg/ha.
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：
Image encryption;Hachimoji DNA coding;DNA computing;six-dimensional hyperchaotic system
摘要：
With the increasing awareness of privacy protection, people pay more and more attention to strengthening the security of image data transmitted over the network. Therefore, this paper designs a chaotic image encrypting algorithm based on dynamic Hachimoji DNA coding and computing to protect images. The Hachimoji DNA coding method provides richer coding rules to dynamically encode images than the traditional DNA coding method, improving the complexity and security of the encryption algorithm. First, the original image is rearranged and encoded with the dynamic Hachimoji DNA coding method according to the sorting and encoding controller sequence generated by a six-dimensional hyperchaotic system. Second, various DNA operations are performed on the encoded image. Among these operations, we not only use the common operations but also propose a new DNA operation called bitwise inversion. Finally, the DNA image is decoded using the dynamic decoding method to obtain the encrypted image. Experiments demonstrated that the image encryption algorithm has a good security effect and can effectively resist common attacks.
期刊：
Neural Computing and Applications,2024年 ISSN：0941-0643
通讯作者：
Liang, L
作者机构：
[Liao, Minglong; Wang, Zongrun; Liang, Lin] Cent South Univ, Business Sch, Changsha 410083, Hunan, Peoples R China.;[Liu, Xin] Hengyang Normal Univ, Coll Econ & Management, Hengyang 421002, Hunan, Peoples R China.;[Liao, Minglong; Liang, Lin] Cent South Univ, Xiangya Hosp, Changsha 410008, Hunan, Peoples R China.
通讯机构：
[Liang, L ] C;Cent South Univ, Business Sch, Changsha 410083, Hunan, Peoples R China.;Cent South Univ, Xiangya Hosp, Changsha 410008, Hunan, Peoples R China.
关键词：
Online health community;Initial trust;Continuous trust;Source of trust;Trust transitivity
摘要：
Internet medical and health services are services that require high levels of trust. We identify factors that influence user trust based on trust source credibility model and trust transitivity model and explore differences in initial and continuous trust formation among users of online health communities from the perspective of trust dynamics. We found that the type of service provision, etc., which represents benevolence trust, whether doctors provide personal photographs, which represents integrity trust, and the overall recommendation popularity, number of electronic gifts, thank you letters, patient votes and positive service quality ratings, which represent trust transitivity, all significantly affect users' initial and continuous trust, but there are differences in the degree of influence on the two types of trust. The doctor's title in the ability trust only has a significant effect on users' initial trust and does not have a significant effect on continuous trust. The three dimensions of ability, benevolence and integrity in the trust source credibility model have a greater impact on users' initial trust than on their continuous trust, while trust transitivity has a greater impact on users' continuous trust than on their initial trust. Overall, in addition to traditional influences such as doctor's title, online information can also support users' decision making, indicating that online health communities can provide useful information to alleviate the current information asymmetry between doctors and patients.
摘要：
Uranium mining operations produce large volumes of acidic uranium mining wastewater, necessitating the development of environmentally friendly and recyclable materials for efficient uranium removal and recovery. The current study successfully produced hydroxyapatite (HAP-L) and magnetic phosphate composites (CaFeP-1, CaFeP-2, and FePO4) through a combination of mixing, ultrasonication, hydrothermal precipitation, and calcination methods. The research explores the influence of various parameters such as pH, solid-liquid ratio, contact time, initial uranium concentration, co-existing ions, and recyclability on the uranium removal efficiency of these materials. The findings indicate exceptional uranium adsorption capacities, with CaFeP-1 exhibiting the highest capacity among the materials, especially in acidic environments. Moreover, CaFeP-1 displays strong resistance to interference from other ions and can be recycled multiple times while maintaining high removal rates. Treatment of acidic uranium mining wastewater by CaFeP-1 results in pH adjustment and the reduction of uranium and other ion concentrations, making it a promising solution for comprehensive remediation of acidic uranium mining wastewater. The U(VI) removal mechanism by CaFeP-1 was validated through XRD, FT-IR, and XPS results. The U(VI) removal was attributed to processes such as dissolution-precipitation, surface complexation, and ion exchange. The formation of sodium uranyl phosphate hydrate was identified as a new product following U(VI) abatement by CaFeP-1. In summary, CaFeP-1 shows great potential for the effective treatment of acidic uranium mining wastewater.
作者：
Li Ji;Song Sheng;Fangyuan Shen;Lili Yang;Shizhi Wen;...
期刊：
CATENA,2024年237:107816 ISSN：0341-8162
通讯作者：
Li Ji<&wdkj&>Xu Wang<&wdkj&>Lixue Yang
作者机构：
[Song Sheng; Lili Yang; Shizhi Wen; Gongxiu He] School of Forestry, Central South University of Forestry and Technology, 410004 Changsha, PR China;[Fangyuan Shen; Lixue Yang] Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education, School of Forestry, Northeast Forestry University, 150040 Harbin, PR China;Hunan Key Laboratory for Conservation and Utilization of Biological Resources in the Nanyue Mountainous Region, Hengyang Normal University, 421008 Hengyang, PR China;School of Life Science, Hengyang Normal University, 421008 Hengyang, PR China;[Xu Wang] Research Institute of Tropical Forestry, Chinese Academy of Forestry, 510520 Guangzhou, PR China
通讯机构：
[Li Ji] S;[Xu Wang] R;[Lixue Yang] K;Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education, School of Forestry, Northeast Forestry University, 150040 Harbin, PR China<&wdkj&>Research Institute of Tropical Forestry, Chinese Academy of Forestry, 510520 Guangzhou, PR China<&wdkj&>School of Forestry, Central South University of Forestry and Technology, 410004 Changsha, PR China<&wdkj&>Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education, School of Forestry, Northeast Forestry University, 150040 Harbin, PR China
摘要：
Soil bacteria, as integral components of the soil microbial community, play pivotal roles in biogeochemical cycles and ecosystem functions in boreal forests. The altitudinal patterns of soil bacteria have been widely reported, but their community assembly is uncertain. Here, we investigated the soil bacterial community attributes (diversity, taxonomic and functional composition, and bacterial interactions) and ecological processes associated with community assembly on Mt. Oakley in the northern Greater Khingan Mountains via Illumina MiSeq sequencing and functional annotation tools. The alpha diversity indices of the soil bacteria exhibited a progressively decreasing trend with increasing altitude across seasons. The relative abundance of the dominant bacterial taxa was more sensitive to altitude than to season. More complex (more nodes and links) bacterial interactions were detected at the lowest and highest altitudinal sites, as well as in September. The variations in the taxonomic and functional compositions of the soil bacteria induced by altitude were mainly driven by the variations in soil pH and extracellular enzyme activities. Stochastic (dispersal limitation and drift) processes largely controlled the soil bacterial community assemblages across spatiotemporal scales. The community assemblages of soil bacteria were affected by altitude-induced changes in the taxonomic composition and functional groups. Collectively, our results have significant implications for understanding bacterial biogeography and community assembly mechanisms along altitudinal gradients in boreal forest ecosystems.
摘要：
Carbon nitride quantum dots (CNQDs) modified cobalt phosphate (CoPi) composites CNQDs/CoPi‐x were applied in photocatalytic H2 evolution. It shown enhanced activity and stability compared to pure CoPi using Eosin Y (EY) as a sensitizer. The employment of CNQDs boosted electron transfer from radical EY·− to CNQDs/CoPi‐x. Abstract In the present work, carbon nitride quantum dots (CNQDs)‐modified cobalt phosphate (CoPi) composites CNQDs/CoPi‐x (x = 1, 2, 3) were prepared at room temperature and characterized by FTIR, XRD, UV–Vis DRS, EIS, SEM, TEM/HR‐TEM, XPS, and N2 gas adsorption. The morphologies and surface areas of CNQDs/CoPi‐x have no remarkable change after modification of CNQDs, compared with pure CoPi. The obtained CNQDs/CoPi‐x shows enhanced activity and stability of photocatalytic H2 evolution compared to pure CoPi using Eosin Y (EY) as a sensitizer and triethanolamine as an electron donor. The CNQDs/CoPi‐2 possesses the highest hydrogen evolution rate, 234.5 μmol h−1 g−1, upon visible light, which outshines that of CoPi by 2.4 times. It was believed that the enhanced photocatalytic performances of the CNQDs/CoPi‐2 could result from the boosted electron transfer from radical EY·− to CNQDs/CoPi‐2 by the employment of CNQDs; in addition, the visible‐light activity of CNQDs contributes to hydrogen evolution. The mechanism of photocatalytic hydrogen production was discussed. This study may contribute toward the development of production of “green hydrogen” using solar.
期刊：
Journal of Physical Chemistry Letters,2024年15(13):3611-3618 ISSN：1948-7185
通讯作者：
Vasenko, AS;Vasenko, Andrey S.;Chulkov, EV
作者机构：
[Tan, Jieyao; Jiang, Xingxing] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Vasenko, AS; Liu, Dongyu; Vasenko, Andrey S.; Jiang, Xingxing] HSE Univ, Moscow 101000, Russia.;[Vasenko, Andrey S.; Chulkov, Evgueni V.; Vasenko, AS] Donostia Int Phys Ctr DIPC, Donostia San Sebastian 20018, Euskadi, Spain.;[Chulkov, Evgueni V.] Ctr Mixto CSIC UPV EHU, Ctr Fis Mat CFM MPC, San Sebastian 20018, Spain.;[Kazakova, Elena A.] Sechenov First Moscow State Med Univ, Dept Biochem, Moscow 119991, Russia.
通讯机构：
[Vasenko, AS ] H;[Vasenko, AS; Chulkov, EV ] D;HSE Univ, Moscow 101000, Russia.;Donostia Int Phys Ctr DIPC, Donostia San Sebastian 20018, Euskadi, Spain.;Ctr Mixto CSIC UPV EHU, Ctr Fis Mat CFM MPC, San Sebastian 20018, Spain.
摘要：
Further improving the activity and selectivity of photocatalytic CO(2) reduction remains a challenge. Herein, we propose a new strategy for synergistically promoting photocatalytic CO(2) reduction by combining two-dimensional (2D) ferroelectric polarization and single-atom catalysis. Our calculations showed that the ferroelectric polarization of CuBiP(2)Se(6) provides the internal driving force for the separation and migration of photogenerated carriers, which provides a prerequisite for enhancing the photocatalytic efficiency. In addition, the introduction of single Ag atoms can act as an electron reservoir to significantly modify the bonding configurations on the surface through proper static electron transfer, thus effectively promoting the adsorption and activation of CO(2) molecules. More importantly, we found that switching the ferroelectric polarization can synergistically optimize the limiting potential as well as control the final products. This study provides a new approach for enhancing the catalytic activity and selectivity of photocatalytic CO(2) reduction.
摘要：
Semiconductor planar nanowire arrays (PNAs) are essential for achieving large-scale device integration. Direct heteroepitaxy of PNAs on a flat substrate is constrained by the mismatch in crystalline symmetry and lattice parameters between the substrate and epitaxial nanowires. This study presents a novel approach termed "self-competitive growth" for heteroepitaxy of CsPbBr(3) PNAs on mica. The key to inducing the self-competitive growth of CsPbBr(3) PNAs on mica involves restricting the nucleation of CsPbBr(3) nanowires in a high-adsorption region, which is accomplished by overlaying graphite sheets on the mica surface. Theoretical calculations and experimental results demonstrate that CsPbBr(3) nanowires oriented perpendicular to the boundary of the high-adsorption area exhibit greater competitiveness in intercepting the growth of nanowires in the other two directions, resulting in PNAs with a consistent orientation. Moreover, these PNAs exhibit low-threshold and stable amplified spontaneous emission under one-, two-, and three-photon excitation, indicating their potential for an integrated laser array.
摘要：
In recent years, the combination of deep learning and side-channel analysis has received extensive attention. Previous research has shown that the key recovery problem can be transformed into a classification problem. The performance of these models strongly depends on the size of the dataset and the number of instances in each target class. The training time is very long. In this paper, the key recovery problem is transformed into a similarity measurement problem in Siamese neural networks. We use simulated power traces and true power traces to form power pairs to augment data and simplify key recovery steps. The trace pairs are selected based on labels and added to the training to improve model performance. The model adopts a Siamese, CNN-based architecture, and it can evaluate the similarity between the inputs. The correct key is revealed by the similarity of different trace pairs. In experiments, three datasets are used to evaluate our method. The results show that the proposed method can be successfully trained with 1000 power traces and has excellent attack efficiency and training speed.
作者机构：
[Yao, Yong-Sheng; Wei, Xiao-Lin; Gong, Ze-Ting; Tang, Zhen-Kun; Li, Jun-Yao; Liu, Yao-Zhong; Liang, Zheng; Tang, ZK] Hengyang Normal Univ, Univ Hunan Prov, Key Lab Micronano Energy Mat & Applicat Technol, Hengyang 421002, Peoples R China.;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang, Peoples R China.
通讯机构：
[Wei, XL ; Tang, ZK] H;Hengyang Normal Univ, Univ Hunan Prov, Key Lab Micronano Energy Mat & Applicat Technol, Hengyang 421002, Peoples R China.
摘要：
The need for low-carbon solar electricity production has become increasingly urgent for energy security and climate change mitigation. However, the bandgap and carrier separation critical requirements of high-efficiency solar cells are difficult to satisfy simultaneously in a single material. In this work, several van der Waals ZnIn(2)X(4) (X = S, Se, and Te) heterostructures were designed based on density functional theory. Our results suggest that both ZnIn(2)S(4)/ZnIn(2)Se(4) and ZnIn(2)Se(4)/ZnIn(2)Te(4) heterostructures are direct bandgap semiconductors at the Γ point. Besides, obvious carrier spatial separations were observed in the ZnIn(2)S(4)/ZnIn(2)Se(4) and ZnIn(2)Se(4)/ZnIn(2)Te(4) heterostructures. Interestingly, the ZnIn(2)S(4)/ZnIn(2)Se(4) heterostructure has a suitable bandgap of 1.43 eV with good optical absorption in the visible light range. The calculated maximum theoretical photoelectric conversion efficiency of ZnIn(2)S(4)/ZnIn(2)Se(4) heterostructure was 32.1%, and it can be further enhanced to 32.9% under 2% tensile strain. Compared to single-layer ZnIn(2)X(4) materials, the electron effective mass of the ZnIn(2)S(4)/ZnIn(2)Se(4) heterostructure is relatively low, which results in high electron mobility in the heterostructure. The suitable bandgap, obvious carrier separation, high electron mobility, and excellent theoretical photoelectric conversion efficiency of the ZnIn(2)S(4)/ZnIn(2)Se(4) heterostructure make it a promising candidate for novel 2D-based photoelectronic devices and solar cells.
摘要：
In this paper, the evolution characteristics of periodic transmission of circularly symmetric multi-ring solitons in optical nonlocal materials based on nonlinear Schrodinger equation are investigated in detail. The transmission expression of circularly symmetric multi-ring solitons has been derived. It was found that the number and size of rings in these solitons can be controlled by initial parameters. The transmission of circularly symmetric multi-ring solitons is similar to that of high-order temporal solitons in nonlinear fibers, exhibiting periodic variations. When the input energy is a specific value, the statistical width of circularly symmetric multi-ring solitons remains constant during transmission, otherwise it exhibits periodic changes, which can be considered as generalized breathing solitons. The influence of various parameters on the transmission characteristics has been analyzed in detail, and some important transmission characteristics have been intuitively demonstrated through numerical simulation.
期刊：
Results in Mathematics,2024年79(2) ISSN：1422-6383
通讯作者：
Chen, SL
作者机构：
[Chen, Shaolin; Chen, SL] Hengyang Normal Univ, Coll Math & Stat, Hengyang 421002, Hunan, Peoples R China.;[Chen, Shaolin; Chen, SL] Hunan Prov Key Lab Intelligent Informat Proc & App, Hengyang 421002, Peoples R China.;[Hamada, Hidetaka] Kyushu Sangyo Univ, Fac Sci & Engn, 3-1 Matsukadai 2 Chome,Higashi Ku, Fukuoka 8138503, Japan.
通讯机构：
[Chen, SL ] H;Hengyang Normal Univ, Coll Math & Stat, Hengyang 421002, Hunan, Peoples R China.;Hunan Prov Key Lab Intelligent Informat Proc & App, Hengyang 421002, Peoples R China.
关键词：
Bloch type space;complex-valued harmonic function;composition operator;hardy space;pluriharmonic functions
摘要：
The main purpose of this paper is to investigate characterizations of composition operators on Bloch and Hardy type spaces. Initially, we use general doubling weights to study the composition operators from harmonic Bloch type spaces on the unit disc D\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathbb {D}}$$\end{document} to pluriharmonic Hardy spaces on the Euclidean unit ball Bn\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathbb {B}}<^>n$$\end{document}. Furthermore, we develop some new methods to study the composition operators from harmonic Bloch type spaces on D\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathbb {D}}$$\end{document} to pluriharmonic Bloch type spaces on D\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathbb {D}}$$\end{document}. Additionally, some application to new characterizations of the composition operators between pluriharmonic Lipschitz type spaces to be bounded or compact will be presented. The obtained results of this paper provide the improvements and extensions of the corresponding known results.
