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Article ; Online: Coupling and Coordination Relationship between the Tourism Economy and Ecosystem Service Value in Southern Jiangsu, China.

Wang, Bin / Hu, Chunguang / Li, Jianxiong

International journal of environmental research and public health

2022 Volume 19, Issue 23

Abstract: The relationship between the tourism economy and the ecosystem service value (ESV) is crucial for sustainable regional development. This study takes southern Jiangsu as a research object. Firstly, the development level of the tourism economy and ... ...

Abstract	The relationship between the tourism economy and the ecosystem service value (ESV) is crucial for sustainable regional development. This study takes southern Jiangsu as a research object. Firstly, the development level of the tourism economy and ecosystem service value in southern Jiangsu from 2000 to 2020 are evaluated with the entropy method, ecosystem service value is estimated and the dynamic degree of land use is computed. Secondly, the coupling coordination degree model is used to explore the coupling coordination degree between the two systems. Finally, the interaction mechanism between the tourism economy and ecosystem service function is elaborated. The result shows that: (1) There are disparities in the levels of a comprehensive tourism economy in different cities, and the overall development level of the tourism economy in southern Jiangsu shows a cyclical fluctuation pattern. (2) Spatial variation of ecosystem service value exists in different cities in southern Jiangsu, with an overall trend of increasing in the beginning followed by a decline. (3) The coupling coordination degree between the tourism economic system and ecosystem service functions in southern Jiangsu demonstrates an inverted U-shaped development pattern from 2000 to 2020, evolving from mild disorder to intermediate coordination and then back to mild disorder, and the development of two subsystems is unstable and imbalanced. Within the region, Nanjing, Suzhou and Zhenjiang have experienced a rise in coupling coordination degree followed by a decline. This study also reveals the coupling mechanism between ecological service functions and the tourism economic system, and provides suggestions for ecological preservation and sustainable development of tourism industry in southern Jiangsu. This research can be a reference for tourism and regional development in southern Jiangsu and the whole Yangtze Delta region.
Language	English
Publishing date	2022-12-02
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2175195-X
ISSN	1660-4601 ; 1661-7827
ISSN (online)	1660-4601
ISSN	1661-7827
DOI	10.3390/ijerph192316136
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Construction, Evaluation, and Optimization of a Regional Ecological Security Pattern Based on MSPA-Circuit Theory Approach.

Hu, Chunguang / Wang, Zhiyong / Huang, Gaoliu / Ding, Yichen

International journal of environmental research and public health

2022 Volume 19, Issue 23

Abstract: Ecological security is crucial for regional sustainable development; however, as modern urbanization highlights ecological security challenges, major challenges have arisen. In this paper, we take the ecological region around Taihu Lake, China, as a ... ...

Abstract	Ecological security is crucial for regional sustainable development; however, as modern urbanization highlights ecological security challenges, major challenges have arisen. In this paper, we take the ecological region around Taihu Lake, China, as a typical research site, extract important ecological sources and key nodes using morphological spatial pattern analysis (MSPA) and circuit theory, and propose a regulatory framework for the ecological security pattern (ESP) of the ecological region based on the spatial characteristics of sources, corridors, and nodes. We obtained the following results: (1) The ESP includes 20 ecological sources, 37 ecological corridors, 36 critical ecological protection nodes, and 24 key ecological restoration nodes. (2) Most ecological sources are large and concentrated in western Zhejiang and west of Taihu Lake, which are both important ecological sources and ecological resistance surfaces. (3) The ecological corridors spread east, west, and south from Taihu Lake, with high network connectivity. (4) Shanghai serves as the central node, with the Su-Xi-Chang town cluster and the Qiantang River town cluster serving as the extension axes for the ecological resistance hot-spot area. The center of the elliptical ecological resistance surface (standard deviation) lies in Suzhou City, located on the east shore of Taihu Lake. (5) Ecological nodes were mostly located in ecological corridors or junctions. A "four zones and one belt" pattern is suggested in order to make the land around Taihu Lake more connected and stable ecologically. This study can be used as a guide for building and improving an ecological safety network.
Language	English
Publishing date	2022-12-03
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2175195-X
ISSN	1660-4601 ; 1661-7827
ISSN (online)	1660-4601
ISSN	1661-7827
DOI	10.3390/ijerph192316184
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Learning-based event locating for single-molecule force spectroscopy.

Lin, Zuzeng / Gao, Xiaoqing / Li, Shuai / Hu, Chunguang

Biochemical and biophysical research communications

2021 Volume 556, Page(s) 59–64

Abstract: Acquiring events massively from single-molecule force spectroscopy (SMFS) experiments, which is crucial for revealing important biophysical information, is usually not straightforward. A significant amount of human labor is usually required to identify ... ...

Abstract	Acquiring events massively from single-molecule force spectroscopy (SMFS) experiments, which is crucial for revealing important biophysical information, is usually not straightforward. A significant amount of human labor is usually required to identify events in the measured force spectrum during measuring or before performing further data analysis. This prevents the experiment from being done in a fully-automated manner or scaling with the throughput of the measuring setup. In this work, we attempt to tackle this problem with a deep learning approach. A deep neural network model is developed to infer the occurrence of the events using the data stream from the measuring setup. We demonstrated that the proposed method could achieve high accuracy with force spectrums of a variety of samples from both optical tweezers and AFMs by learning from user-given samples instead of complicated manual algorithm designing or parameter tuning. Furthermore, we found that the trained model can be used to perform event detection on datasets measured from a different optical tweezer setup, showing the potential of being leveraged in more complex deep learning schemes.
MeSH term(s)	Automation ; Deep Learning ; Microscopy, Atomic Force ; Optical Tweezers ; Single Molecule Imaging/methods
Language	English
Publishing date	2021-04-08
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	205723-2
ISSN	1090-2104 ; 0006-291X ; 0006-291X
ISSN (online)	1090-2104 ; 0006-291X
ISSN	0006-291X
DOI	10.1016/j.bbrc.2021.03.159
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Combining MSPA-MCR Model to Evaluate the Ecological Network in Wuhan, China

Hu, Chunguang / Wang, Ziyi / Wang, Yu / Sun, Dongqi / Zhang, Jingxiang

Land. 2022 Jan. 29, v. 11, no. 2

2022

Abstract: Rapid urbanization development and construction has seriously threatened the connectivity of habitat patches in cities and hindered the construction of ecological networks in highly urbanized areas. Among them, China is affected by early compressed ... ...

Abstract	Rapid urbanization development and construction has seriously threatened the connectivity of habitat patches in cities and hindered the construction of ecological networks in highly urbanized areas. Among them, China is affected by early compressed urbanization, and the broken ecological space in cities and towns has attracted the extensive interest of researchers. To avoid the subjective randomness and single analysis of ecological space in urbanization areas, this paper takes the central urban area of Wuhan as the main research area. It comprehensively evaluates the ecological network space by combining the MSPA-MCR model. The main conclusions are as follows: (1) Identifying the ecological landscape types with important ecological significance in the study area: Core (88.29%), Islet (0.25%), Perf (0.63%), Edge (9.74%), Loop (0.22%), and Bridge (0.14%). Through the dPC landscape index, seven important ecological sources south of the middle reaches of the Yangtze River were identified. (2) According to the comprehensive factors of natural and human factors constructed by the MCR model, the minimum cumulative ecological resistance surface was established, with an average value of 2.65, a maximum value of 4.70, and a minimum value of 1.00, showing a trend that the ecological resistance values in the central and eastern parts are lower than those in the western part. (3) According to the standard deviation ellipse, the distribution direction of NE–SW in ecological sources was analyzed. The ecological sources distributed in the north were less, and the spatial distribution was scattered on the whole. The strong global positive correlation and local spatial aggregation characteristics of ecological resistance surface were evaluated according to spatial autocorrelation. Based on the gravity model, the interaction intensity of ecological corridors between source areas was evaluated, and the importance of ecological corridor protection and restoration was quantitatively analyzed. The research results provide scientific and reasonable references and a basis for ecological planning of Wuhan central city.
Keywords	autocorrelation ; habitats ; humans ; land ; landscapes ; models ; standard deviation ; urban areas ; urbanization ; Yangtze River
Language	English
Dates of publication	2022-0129
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article
ZDB-ID	2682955-1
ISSN	2073-445X
ISSN	2073-445X
DOI	10.3390/land11020213
Database	NAL-Catalogue (AGRICOLA)

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Article: Seasonal Contrast and Interactive Effects of Potential Drivers on Land Surface Temperature in the Sichuan Basin, China

Wang, Ziyi / Sun, Dongqi / Hu, Chunguang / Wang, Yu / Zhang, Jingxiang

Remote Sensing. 2022 Mar. 06, v. 14, no. 5

2022

Abstract: Little is known about the seasonal heterogeneity of land surface temperature (LST) and the interaction relationship between potential drivers in Sichuan Basin, China. In this study, based on exploring the spatial heterogeneity of LST in Sichuan Basin, ... ...

Abstract	Little is known about the seasonal heterogeneity of land surface temperature (LST) and the interaction relationship between potential drivers in Sichuan Basin, China. In this study, based on exploring the spatial heterogeneity of LST in Sichuan Basin, China, multi-source remote sensing data as potential drivers were selected and a Geo-detector model was applied to analyze the main drivers and the interactive relationship between drivers on LST during different seasons. The results showed that the high-temperature areas in Sichuan Basin in different seasons all appeared in the cities near the high mountains on the edge of the basin. This phenomenon was summarized as “sinking heat island” by us. From the driving factors, the biophysical parameters (DEM, SLOPE and NDVI) had the greatest impact on LST in each season, reaching the peak in the transition season. The climate parameters (WIND, HUM, PRE and TEM) and socioeconomic parameters (LIGHT, POP and ROAD) also had a certain impact on LST. The influence of a single landscape parameter (SHDI, PD, LPI, ED and LSI) on LST is limited. From the effect of factor interaction on LST, the interaction of biophysical parameters, climatic parameters and landscape parameters from summer to the transitional season was strengthened obviously, and it showed a downward trend in the winter; in contrast, the socioeconomic parameters showed the opposite characteristics, indicating that the interaction between human activities and other factors affected LST more obviously in the winter. The results of this study are not only valuable for understanding the spatial features of LST but also important for formulating mitigation strategies and sustainable development of urban heat island in Sichuan Basin.
Keywords	basins ; climate ; heat island ; humans ; landscapes ; models ; spatial variation ; summer ; surface temperature ; sustainable development ; winter ; China
Language	English
Dates of publication	2022-0306
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article
ZDB-ID	2513863-7
ISSN	2072-4292
ISSN	2072-4292
DOI	10.3390/rs14051292
Database	NAL-Catalogue (AGRICOLA)

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Article: Simulation and Experiment of the Trapping Trajectory for Janus Particles in Linearly Polarized Optical Traps.

Gao, Xiaoqing / Zhai, Cong / Lin, Zuzeng / Chen, Yulu / Li, Hongbin / Hu, Chunguang

Micromachines

2022 Volume 13, Issue 4

Abstract: The highly focused laser beam is capable of confining micro-sized particle in its focus. This is widely known as optical trapping. The Janus particle is composed of two hemispheres with different refractive indexes. In a linearly polarized optical trap, ... ...

Abstract	The highly focused laser beam is capable of confining micro-sized particle in its focus. This is widely known as optical trapping. The Janus particle is composed of two hemispheres with different refractive indexes. In a linearly polarized optical trap, the Janus particle tends to align itself to an orientation where the interface of the two hemispheres is parallel to the laser propagation as well as the polarization direction. This enables a controllable approach that rotates the trapped particle with fine accuracy and could be used in partial measurement. However, due to the complexity of the interaction of the optical field and refractive index distribution, the trapping trajectory of the Janus particle in the linearly polarized optical trap is still uncovered. In this paper, we focus on the dynamic trapping process and the steady position and orientation of the Janus particle in the optical trap from both simulation and experimental aspects. The trapping process recorded by a high speed camera coincides with the simulation result calculated using the
Language	English
Publishing date	2022-04-13
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2620864-7
ISSN	2072-666X
ISSN	2072-666X
DOI	10.3390/mi13040608
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Deep learning for precise axial localization of trapped microspheres in reflective optical systems.

Guo, Mengdi / Lin, Zuzeng / Zhai, Cong / Chen, Yulu / Zhou, Xiaowei / Chai, Zhongyan / Guo, Tong / Hu, Chunguang

Optics express

2023 Volume 31, Issue 8, Page(s) 12397–12409

Abstract: High-precision axial localization measurement is an important part of micro-nanometer optical measurement, but there have been issues such as low calibration efficiency, poor accuracy, and cumbersome measurement, especially in reflected light ... ...

Abstract	High-precision axial localization measurement is an important part of micro-nanometer optical measurement, but there have been issues such as low calibration efficiency, poor accuracy, and cumbersome measurement, especially in reflected light illumination systems, where the lack of clarity of imaging details leads to the low accuracy of commonly used methods. Herein, we develop a trained residual neural network coupled with a convenient data acquisition strategy to address this challenge. Our method improves the axial localization precision of microspheres in both reflective illumination systems and transmission illumination systems. Using this new localization method, the reference position of the trapped microsphere can be extracted from the identification results, namely the "positioning point" among the experimental groups. This point relies on the unique signal characteristics of each sample measurement, eliminates systematic repeatability errors when performing identification across samples, and improves the localization precision of different samples. This method has been verified on both transmission and reflected illumination optical tweezers platforms. We will bring greater convenience to measurements in solution environments and will provide higher-order guarantees for force spectroscopy measurements in scenarios such as microsphere-based super-resolution microscopy and the surface mechanical properties of adherent flexible materials and cells.
Language	English
Publishing date	2023-05-08
Publishing country	United States
Document type	Journal Article
ZDB-ID	1491859-6
ISSN	1094-4087 ; 1094-4087
ISSN (online)	1094-4087
ISSN	1094-4087
DOI	10.1364/OE.487866
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Microsphere probe: combining microsphere-assisted microscopy with AFM.

Hong, Yujian / Xiao, Shasha / Zhai, Cong / Lu, Nianhang / Geng, Guangyu / Lu, Junsheng / Wu, Sen / Hu, Chunguang / Hu, Xiaodong

Optics express

2023 Volume 31, Issue 17, Page(s) 27520–27528

Abstract: In recent years, microsphere-assisted microscopy (MAM) and atomic force microscope (AFM) have been rapidly developed to meet the measurement needs of microstructures. However, the positioning of microspheres, the inability of AFM to touch the underlying ... ...

Abstract	In recent years, microsphere-assisted microscopy (MAM) and atomic force microscope (AFM) have been rapidly developed to meet the measurement needs of microstructures. However, the positioning of microspheres, the inability of AFM to touch the underlying sample through the transparent insulating layer, and the challenge of AFM fast positioning limit their use in practical measurements. In this paper, we propose a method that combines MAM with AFM by adhering the microsphere to the cantilever. This method allows MAM and AFM to work in parallel, and their imaging positions can correspond with each other. We use this method to measure memory devices, and the results show that MAM and AFM yield complementary advantages. This approach provides a new tool for analyzing complex structures in devices and has potential for wide application.
Language	English
Publishing date	2023-09-14
Publishing country	United States
Document type	Journal Article
ZDB-ID	1491859-6
ISSN	1094-4087 ; 1094-4087
ISSN (online)	1094-4087
ISSN	1094-4087
DOI	10.1364/OE.494572
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Excitons Enabled Topological Phase Singularity in a Single Atomic Layer.

Ma, Guoteng / Shen, Wanfu / Sanchez, Daniel Soy / Yu, Yu / Wang, Han / Sun, Lidong / Wang, Xinran / Hu, Chunguang

ACS nano

2023 Volume 17, Issue 18, Page(s) 17751–17760

Abstract: The nontrivial and rigorous Heaviside phase jump behavior of phase singularities (PSs) empowers exotic topological modes and widely divergent nature compared to neighboring points, which has attracted great attention in condensed matter physics as well ... ...

Abstract	The nontrivial and rigorous Heaviside phase jump behavior of phase singularities (PSs) empowers exotic topological modes and widely divergent nature compared to neighboring points, which has attracted great attention in condensed matter physics as well as applications in photonics and ultrasensitive sensors. Here we demonstrate the universal existence of a family of topologically protected PSs generated from exciton resonances of single-atom layers. We obtain the PSs by coating the transition metal dichalcogenide (TMDC) monolayers on a nonabsorptive semi-infinite substrate without surface plasmon effect or other assisted resonators, which exploits the benefits of both exciton-dominated enhancement and peculiarities of the singular phase. We show that a refractive indices matched transparent substrate enables TMDC monolayers to exhibit topologically protected zero reflection accompanied by a perfect Heaviside π-phase jump at strong light adsorptions, which can be utilized to radically reduce the thickness of PS-based devices to a single atomic layer. By using the TMDC monolayer-based PSs for refractive index biosensors, we demonstrate its superior phase sensitivity at a level of 10
Language	English
Publishing date	2023-09-11
Publishing country	United States
Document type	Journal Article
ISSN	1936-086X
ISSN (online)	1936-086X
DOI	10.1021/acsnano.3c02478
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: A self-powered 2D-material sensor unit driven by a SnSe piezoelectric nanogenerator

Li, Peng / Zhang, Zekun / Shen, Wangtian / Hu, Chunguang / Shen, Wanfu / Zhang, Dongzhi

Journal of materials chemistry A. 2021 Mar. 2, v. 9, no. 8

2021

Abstract: We report the first experimental study of the piezoelectricity of 2D SnSe crystals. SnSe demonstrates a maximum piezoelectric output voltage of ∼760 mV, which is the highest voltage generated by a single piece of 2D material reported so far. The power ... ...

Abstract	We report the first experimental study of the piezoelectricity of 2D SnSe crystals. SnSe demonstrates a maximum piezoelectric output voltage of ∼760 mV, which is the highest voltage generated by a single piece of 2D material reported so far. The power density reaches 28 mW m⁻² with a mechanical-to-electrical energy conversion efficiency of 6.5%. The piezoelectricity of SnSe is highly orientation dependent, and the piezoelectric signal along the armchair orientation is ∼5 times larger than that along the zigzag orientation. A SnSe piezoelectric nanogenerator is able to monitor human body motion and vital health signs, such as the heart rate, because of its unprecedented piezoelectricity. We demonstrate a solely 2D-material self-powered sensor unit (SPSU) by integrating a SnSe nanogenerator and a MoS₂ multi-functional sensor on one chip. This all-in-one system powered by heartbeats and periodical bending demonstrates superb pH, illumination intensity, and humidity sensing performance. The sensing mechanism of the SPSU is investigated. The discovery of piezoelectricity in SnSe provides a way for achieving novel self-powered atomic-scale electromechanical systems which could stimulate further fundamental research and potential applications.
Keywords	electric potential difference ; energy conversion ; heart rate ; humans ; humidity ; light intensity ; pH
Language	English
Dates of publication	2021-0302
Size	p. 4716-4723.
Publishing place	The Royal Society of Chemistry
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	2702232-8
ISSN	2050-7496 ; 2050-7488
ISSN (online)	2050-7496
ISSN	2050-7488
DOI	10.1039/d0ta10457d
Database	NAL-Catalogue (AGRICOLA)

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