作者机构：
[Zeng, Chang; Chen, Wenhao] Cent South Univ Forestry & Technol, Sch Business, Changsha 410004, Peoples R China.;[Ding, Chuheng] Cent South Univ Forestry & Technol, Bangor Coll China, Changsha 410004, Peoples R China.;[Zhu, Yingfang; Sun, Yurong] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.
通讯机构：
[Yurong Sun] C;College of Science, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Author to whom correspondence should be addressed.
关键词：
resource-saving and environment-friendly society;air pollution;Hurst index
摘要：
Since the 21st century, China has made many explorations to alleviate the increasingly serious air pollution problem. This study analyses the spatio-temporal evolution characteristics and future development of PM2.5 concentration in the Changsha-Zhuzhou-Xiangtan urban agglomeration from 2008 to 2019. In addition, the driving mechanism of spatial differentiation of PM2.5 concentration in this urban agglomeration was also investigated. The results were as follows. Firstly, the PM2.5 concentration showed a trend of gradual decline between 2008 and 2019. Secondly, the PM2.5 concentration distribution was high in the northwest and low in the southeast. Thirdly, PM2.5 concentration showed a strong spatial agglomeration. Fourth, except for some rural areas of Chaling County and Yanling County, the concentration of PM2.5 in other areas was very likely to continue the past trend of gradual decline. Finally, natural and meteorological conditions played a leading role in the evolution of PM2.5 concentration. The influence of socioeconomic factors is small now, but the trend is increasing. To improve air quality deeply, policymakers need to promote comprehensive control of regional air pollution by simultaneously reducing emissions and taking comprehensive treatment. They also need to strengthen supervision to prevent excessive pollution in some rural areas from worsening air quality in the surrounding areas.
通讯机构：
[Zheng Zhou] D;Department of Physics, Hunan Institute of Technology, Hengyang, China
关键词：
Lee–Huang–Yang correction;Non-parity-time-symmetric potential;Self-bound states
摘要：
We numerically investigate the existence and stability of self-bound states forming in a one-dimensional binary bosonic condensate confined in non-parity-time (
$$\mathcal{PT}\mathcal{}$$
)-symmetric complex potentials under the influence of the Lee–Huang–Yang (LHY) correction. The linear spectrum of the non-
$$\mathcal{PT}\mathcal{}$$
-symmetric complex potentials may undergo phase transition where the eigenspectrum changes from partially complex to all real through the adjustment of the phase transition parameter. Below the phase transition, it is shown that the fundamental and dipole self-bound states can exist in different regions bifurcating from different discrete eigenvalues in the linear spectrum. The fundamental and dipole self-bound states are completely stable for the general case (i.e.,
$$\sigma =1$$
, with
$$\sigma $$
being the relative strength of the cubic self-interaction between atoms with respect to the quadratic LHY correction). Above the phase transition, the self-bound states are not stable for
$$\sigma =1$$
regardless of the value of the condensate norm. However, the fundamental self-bound states in the large condensate are able to become stable by decreasing
$$\sigma $$
to relatively small values.
期刊：
International Journal of Biological Macromolecules,2022年215:625-634 ISSN：0141-8130
通讯作者：
Xin Guo<&wdkj&>Guoxin Ma
作者机构：
[Ma, Qiang; Ren, Tingting; Peng, Junwen; Guo, Xin; Liu, Zhihuan; Yuan, Hanmeng] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;[Ma, Guoxin] Yantai Univ, Sch Comp & Control Engn, Yantai 264005, Shandong, Peoples R China.;[Qiao, Jianzheng; Wu, Yiqiang; Peng, Junwen] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
通讯机构：
[Xin Guo] C;[Guoxin Ma] S;College of Science, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>School of Computer and Control Engineering, Yantai University, Yantai, Shandong 264005, China
摘要：
Cu2+ is a major environmental pollutant. An efficient measurement for Cu2+ is urgently needed. In this report, we have developed a new sensitive and selective ratiometric sensing platform using 7-amino4-methylcoumarin (AMC) for detecting Cu2+ in real samples. In the presence of Cu2+, o-phenylenediamine (OPD) could be catalytically oxidized to 2,3-diaminophenazine (DAP), which could react with AMC, leading to quench the fluorescence intensity of AMC at 438 nm. Meanwhile, DAP provided a new emission peak at 557 nm. Based on the efficient overlapped spectrum of AMC and DAP, a ratiometric sensing platform through fluorescence resonance energy transfer (FRET) was carried out. Furthermore, the as-proposed strategy displayed the linear relationship in the wide range from 6 to 250 lM with a low detection limit of 0.059 lM, and the recoveries of the spiked samples in real samples ranged from 86.5% to 110.1%. Moreover, comparing the visual fluorescence colors of the real samples with the standard colorimetric card, we used the as-proposed strategy as a solid-based platform for realizing an efficient semi-quantitative detection of Cu2+ via naked-eye visual fluorescence mode without any complicated instrument and operation. The above results implied that the as-proposed strategy could be used in the practice determination of Cu2+. (c) 2021 Elsevier B.V. All rights reserved.
作者：
Gao, Shijuan;Li, Yi;Zhu, Jianjun;Fu, Haiqiang;Zhou, Cui
期刊：
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS,2022年19:1-5 ISSN：1545-598X
通讯作者：
Li, Y.
作者机构：
[Zhu, Jianjun; Fu, Haiqiang; Li, Yi; Gao, Shijuan] Central South University, School of Geoscience and Info-Physics, Changsha, 410083, China;[Zhou, Cui] Central South University of Forestry and Technology, College of Science, Changsha, 410004, China
通讯机构：
[Li, Y.] C;Central South University, School of Geoscience and Info-Physics, Changsha, China
关键词：
and land elevation satellite-2 (ICESat-2);Canopy height;cloud;ice;photon cloud classification;photon cloud filtering refinement
作者机构：
[Liu, Hao; Cao, Heng; Huang, Chao; Tian, Haoran; Xu, Haiyin; Sun, Chengyou; Zhu, Jian; Wang, Ping] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Huang, Chao] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Peoples R China.;[Yin, Jinglin] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;[Liu, Zhiming] Eastern New Mex Univ, Dept Biol, Portales, NM 88130 USA.
通讯机构：
[Chao Huang] C;College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China
期刊：
Journal of Computational and Applied Mathematics,2022年408:114136 ISSN：0377-0427
通讯作者：
Jun Zhou
作者机构：
[Xu, Da; Qiu, Wenlin; Guo, Jing] Hunan Normal Univ, Sch Math & Stat, Key Lab Comp & Stochast Math, Minist Educ, Changsha 410081, Hunan, Peoples R China.;[Zhou, Jun] Cent South Univ Forestry & Technol, Inst Math & Phys, Coll Sci, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Jun Zhou] I;Institute of Mathematics and Physics, College of Science, Central South University of Forestry and Technology, Changsha, 410004, Hunan, PR China
关键词：
Non-linear eighth-order BVPs;Sinc method;DE transformation;Exponential convergence;Arbitrary even order
摘要：
This paper shows the exponential convergence of the Sinc-collocation method based on the double exponential (DE) transformation applied to eighth-order boundary value problems (BVPs). Then using Kantorovich's theorem, we obtain the exponential convergence of the non-linear eighth-order ordinary differential equation (ODE). Furthermore, we extend the analytical results to the arbitrary even-order case. In the numerical experiment, several linear and nonlinear examples are provided to verify our theoretical analysis. Meanwhile, the solution yielded via DE transformation is compared with those obtained by single exponential (SE) transformation and existing method to demonstrate the high efficiency and accuracy of our method. (C)& nbsp;2022 Elsevier B.V. All rights reserved.
作者机构：
[WANG Peng] School of Electronic Engineering and Intelligent Manufacturing, Anqing Normal University;[ZHOU Tao; DING Sijing] School of Mathematics and Physics, China University of Geosciences (Wuhan);[LI Jianbo] Institute of Mathematics and Physics, Central South University of Forestry and Technology;[WANG Ququan] School of Physics and Technology, Wuhan University
摘要：
This paper investigates the factors which can influence the quenching effect from the perspective of energy transfer. The quenched fluorescence of the Cd Se semiconductor quantum dots（SQDs） by using plasmonic Au nanocrystals（p-AuNCs） and molecule-like Au nanocrystals（m-AuNCs） in aqueous suspensions and spin-coated films is comparatively investigated. In the aqueous suspensions, the p-AuNCs have larger quenching effect than the m-AuNCs. In the spin-coated films, the p-AuNCs and m-AuNCs have comparable quenching factor. Furthermore, the experiments show that the p-AuNCs simultaneously enhance the radiative and nonradiative rates. But the m-Au NCs only enhance the nonradiative rate of the SQDs, which reveals the difference of quenching process between the p-AuNCs and m-AuNCs. This result of the research has guiding significance for the detection technique based on the fluorescence quenching.
通讯机构：
[Wu, LJ ] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.
摘要：
A novel and mild metal-free catalyzed radical-mediated cascade spirocyclization of N-benzylacrylamides with polyhaloalkanes is proposed for the preparation of polyhalo-substituted azaspirocyclohexadienones. Notably, polyhaloalkanes are employed as efficient alkyl radical sources via the cleavage of C(sp3)–H bonds. This protocol undergoes a cascade radical addition and intramolecular cyclization/dearomatization process, and enables the easy construction of multiple chemical bonds and a spiro ring in a single reaction.
作者机构：
[Li, Mengyao; Lu, Yuxin; Zhou, Cui; Ouyang, Jie; Zhao, Linlin; Hua, Ziheng; Wang, Xiaoman; Luo, Yongfeng; Xiong, Wanning; Liu, Gonggang; Yin, Wei] Cent South Univ Forestry & Technol, Coll Sci, Mat Sci & Engn Sch, Hunan Prov Key Lab Mat Surface & Interface Sci & T, Changsha 410004, Peoples R China.;[Xu, Binghui] Qingdao Univ, Inst Mat Energy & Environm, Sch Mat Sci & Engn, Qingdao 266071, Peoples R China.
通讯机构：
[Gonggang Liu; Yongfeng Luo] H;Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology, College of Science, Material Science and Engineering School, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Authors to whom correspondence should be addressed.
关键词：
semi-embedding;transition metal oxides;hybrid ZIFs;wood-derived carbon;supercapacitors
摘要：
Transition metal oxides (TMOs) can provide high theoretical capacitance due to the change of multiple valence states of transition metals. However, their intrinsic drawbacks, including poor electrical conductivity, lower energy density, and huge volume expansion, will result in the pulverization of electrode materials and restricted electrochemical kinetics, thus leading to poor rate capability and rapid capacity fading. Composite electrodes based on transition metal oxides and carbon-based materials are considered to be promising candidates for overcoming these limitations. Herein, we reported a preparation method of hybrid ZIFs derived Zn-doped Co3O4/carbon (Zn-Co3O4/C-230) particles semi-embedded in wood-derived carbon skeleton for integrated electrodes. A large specific surface area, excellent conductivity, and electrochemical stability provide a larger electrochemical activity and potential window for the electrode. Prepared Zn-Co3O4@CW-230 electrode (0.6 mm thick) displays ultrahigh area specific capacitances of 7.83 and 6.46 F cm(-2) at the current densities of 5 and 30 mA cm(-2), respectively. Moreover, a symmetric supercapacitor assembled by two identical Zn-Co3O4@CW-230 electrodes delivers a superior area-specific capacitance of 2.61 F cm(-2) at the current densities of 5 mA cm(-2) and great energy densities of 0.36 mWh cm(-2) (6.0 mWh cm(-3)) at 2.5 mW cm(-2), while maintaining 97.3% of initial capacitance over 10,000 cycles. It notably outperforms those of most carbon-based metal oxides, endowing the Zn-Co3O4@CW-230 with extensive prospects for practical application.
作者机构：
[宋婷婷; 毛勋] Chemistry and Materials Science College, Northwest University, Xi'an;710127, China;Science College, Central South University of Forestry and Technology, Changsha;410004, China;[宋婷婷] 710127, China
摘要：
LaNb2VO9:Dy3+ yellow phosphors were synthesized by high-temperature solid-state method. The luminescent properties, structure, and color purity of the products were studied systematically. LaNb2VO9:Dy3+ phosphors can be effectively excited by two broad charge transfer bands (CTB) under 307 nm excitation. The strong yellow light at 570 nm was caused by the F-4(9/2) ->& nbsp;H-6(13/2) energy level transition of Dy3+. The optimum doping concentration of LaNb2VO9:0.1Dy(3+)& nbsp;phosphor was x = 0.10 mol, and the dominant factor of concentration quenching effect is the nearest-neighbor ions interaction. The chromaticity coordinates of International Committee LaNb2VO9:Dy3+ were located in the yellow color area. In addition, LaNb2VO9:0.1Dy3+ phosphor can well visualize the latent fingerprint (LFP) image and lip print image. The levels 1-3 features of fingerprint and groove pattern of lip print can be easily recognized, with high resolution and contrast. The experimental results showed LaNb2VO9:Dy3+ can be well applied to LFP and lip print detection.
