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Article ; Online: Land-Use/Land-Cover Change and Ecosystem Service Provision in Qinghai Province, China

Xiaofan Ma / Haifeng Zhang

Land, Vol 12, Iss 656, p

From the Perspective of Five Ecological Function Zones

2023 Volume 656

Abstract: Qinghai Province is an important part of the Qinghai-Tibet Plateau and has special importance in the construction of ecological civilisation in China, which is related to the ecological security of the country and long-term development. The land is the ... ...

Abstract	Qinghai Province is an important part of the Qinghai-Tibet Plateau and has special importance in the construction of ecological civilisation in China, which is related to the ecological security of the country and long-term development. The land is the basis of terrestrial ecosystem services. Land use/cover change (LUCC) can alter the structure, distribution and processes of terrestrial ecosystems, thereby affecting ecosystem services. Ecological Function Zone (EFZ) is the special zone designated by the government to protect ecosystems more effectively. Studying the response of ecosystem services value (ESV) to LUCC within EFZ is of great significance to the construction of ecological civilization in Qinghai Province. This study uses five periods of land use data from 1980 to 2020 and selects the equivalent factor method, correction method and elasticity model to analyse the characteristics of land use change and its impact on the value of ecosystem services. The conclusions are as follows. (1) The results showed that the ESV of Qinghai Province decreased from 822.559 billion yuan in 1980 to 819.903 billion yuan in 2000, and then increased rapidly to 905.775 billion yuan in 2020, showing a total increase of 83.216 billion yuan (1 RMB equates to 0.144129 USD). The restoration of grassland and the expansion of water bodies are the main reasons for the growth of ESV. (2) The ESV of Sanjiangyuan EFZ was the highest, followed by Qaidam EFZ, Qinghai Lake EFZ and Qilian Mountains EFZ, while Hehuang EFZ was the lowest. (3) The elasticity of the ESV to LUCC generally declined in all EFZs. Every 1% change in the LUCC in the Qaidam EFZ will result in a 4.78% change in ESV, followed by the Sanjiangyuan EFZ (2.56%), Qilian Mountains EFZ (2.1%), Qinghai Lake EFZ (1.01%), and the Hehuang EFZ with the lowest elasticity index (0.53%). (4) The distribution of the high values of the ESV elasticity gradually expands, with a clear spatial distribution characteristic of high west and low east. (5) The most suitable area for urban ...
Keywords	ecosystem service value ; LUCC ; elasticity ; Ecological Function Zone (EFZ) ; Qinghai Province ; Agriculture ; S
Subject code	910
Language	English
Publishing date	2023-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Variations in the Value and Trade-Offs/Synergies of Ecosystem Services on Topographic Gradients in Qinghai Province, China

Xiaofan Ma / Haifeng Zhang

Sustainability, Vol 14, Iss 15546, p

2022 Volume 15546

Abstract: Qinghai Province is an important part of the Qinghai–Tibet Plateau. It is the birthplace of the Yangtze, Yellow, and Lancang (Mekong) Rivers, the recharge area for China’s freshwater resources. With different terrains, the temperature, daylight, and ... ...

Abstract	Qinghai Province is an important part of the Qinghai–Tibet Plateau. It is the birthplace of the Yangtze, Yellow, and Lancang (Mekong) Rivers, the recharge area for China’s freshwater resources. With different terrains, the temperature, daylight, and precipitation of Qinghai Province are widely variable. Consequently, the topography largely determines the spatial distribution of ecosystem services (ESs) and affects their interaction. Studying the impact of topography on the spatial-temporal evolution of ESs and their interaction is of great significance for land-use planning and the ecological civilization in Qinghai Province. To explore the spatial distribution and evolution characteristics of ESV and trade-offs/synergies among ESs in Qinghai Province, we considered topography (elevation, slope, RDLS, and terrain niche index) in 1980, 1990, 2000, 2010, and 2020 using the ArcGIS software and the equivalent factor method. The results were then corrected using various parameters. The results showed that the ESV of Qinghai Province decreased from 129,573.99 million USD in 1980 to 129,155.85 million USD in 2000, and then increased rapidly to 142,682.97 million USD in 2020. The spatial distribution of ESV is characterized by high in the south and east and low in the northwest. The geographical distribution and temporal variation of ESV and trade-offs/synergies of ES pairs show distinct vertical zonality, and the relationship between ESs showed different patterns on different topographic gradients. Hence, priority should be given to the ecological protection of high-altitude areas, and the implementation of ecological migration continued. The implementation of protection measures considering the ecological conditions under different topographic gradients can ensure more appropriate ecosystem management and more sensible decision-making.
Keywords	ecosystem service value ; trade-offs/synergies ; topographic gradient ; spatiotemporal variations ; vertical zonality ; Qinghai province ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
Subject code	910
Language	English
Publishing date	2022-11-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Study on Regenerative Processing Performance of Chlorinated Polyethylene Based on Wireless Network and Artificial Intelligence Technology

Haifeng Zhang / Lianzhu Zhou

Computational Intelligence and Neuroscience, Vol

2022 Volume 2022

Abstract: The development of Information Technology has intruded the chemical industry. In the conventional chemical industry, humans are involved in monitoring the chemical evaporation processes. If there is any damage, then humans suffer enormously. These ... ...

Abstract	The development of Information Technology has intruded the chemical industry. In the conventional chemical industry, humans are involved in monitoring the chemical evaporation processes. If there is any damage, then humans suffer enormously. These drawbacks are overcome in the chemical industry by implanting the sensors to the required blocks for monitoring the levels of chemical substances. An alert system can be introduced with an artificial intelligence algorithm to regenerate the process using details updated in the database. In this research, the machine-based Time-Temperature Superposition (TTS) method is implemented to monitor the chemical reactions in the chemical component manufacturing company.
Keywords	Computer applications to medicine. Medical informatics ; R858-859.7 ; Neurosciences. Biological psychiatry. Neuropsychiatry ; RC321-571
Language	English
Publishing date	2022-01-01T00:00:00Z
Publisher	Hindawi Limited
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Landmark-Assisted Anatomy-Sensitive Retinal Vessel Segmentation Network

Haifeng Zhang / Yunlong Qiu / Chonghui Song / Jiale Li

Diagnostics, Vol 13, Iss 2260, p

2023 Volume 2260

Abstract: Automatic retinal vessel segmentation is important for assisting clinicians in diagnosing ophthalmic diseases. The existing deep learning methods remain constrained in instance connectivity and thin vessel detection. To this end, we propose a novel ... ...

Abstract	Automatic retinal vessel segmentation is important for assisting clinicians in diagnosing ophthalmic diseases. The existing deep learning methods remain constrained in instance connectivity and thin vessel detection. To this end, we propose a novel anatomy-sensitive retinal vessel segmentation framework to preserve instance connectivity and improve the segmentation accuracy of thin vessels. This framework uses TransUNet as its backbone and utilizes self-supervised extracted landmarks to guide network learning. TransUNet is designed to simultaneously benefit from the advantages of convolutional and multi-head attention mechanisms in extracting local features and modeling global dependencies. In particular, we introduce contrastive learning-based self-supervised extraction anatomical landmarks to guide the model to focus on learning the morphological information of retinal vessels. We evaluated the proposed method on three public datasets: DRIVE, CHASE-DB1, and STARE. Our method demonstrates promising results on the DRIVE and CHASE-DB1 datasets, outperforming state-of-the-art methods by improving the F1 scores by 0.36% and 0.31%, respectively. On the STARE dataset, our method achieves results close to the best-performing methods. Visualizations of the results highlight the potential of our method in maintaining topological continuity and identifying thin blood vessels. Furthermore, we conducted a series of ablation experiments to validate the effectiveness of each module in our model and considered the impact of image resolution on the results.
Keywords	retinal vessel segmentation ; TransUNet self-supervised landmark ; contrastive learning ; Medicine (General) ; R5-920
Subject code	006
Language	English
Publishing date	2023-07-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Influence of clearance between cradle and barrel on nonlinear dynamic response of the artillery system

Shaojie Lu / Zhiying Gao / Haifeng Zhang / Maolin Liao

SN Applied Sciences, Vol 5, Iss 11, Pp 1-

2023 Volume 15

Abstract: Abstract The artillery weapon system,characterized as a complex nonlinear mechanical system, is influenced by various factors affecting its muzzle vibration response.In the article, the model of the artillery system with variable cross-section and ... ...

Abstract	Abstract The artillery weapon system,characterized as a complex nonlinear mechanical system, is influenced by various factors affecting its muzzle vibration response.In the article, the model of the artillery system with variable cross-section and multistep barrel is established on the basis of the bending deformation equation, and the fundamental frequency equation is obtained, and the auxiliary verification is completed through modal testing and finite element methods. Then, considering the clearance between the barrel and the cradle, the equivalent nonlinear dynamic model of the vertical vibration of the muzzle is established is established. Furthermore, the multi-scale analysis method obtains the amplitude-frequency curve of the equivalent model under sinusoidal excitation, and analyzes the influence of parameters on the response characteristics. Finally, the vibration research system of the model of the artillery system is constructed to study the vibration characteristics of the muzzle. The results show that the equivalent nonlinear dynamic model established in the paper has certain accuracy, which can provide a certain reference for the related research of the artillery system
Keywords	Variable cross-section ; Natural frequency ; Nonlinear ; Multi-scale method ; Vibration characteristics ; Science ; Q ; Technology ; T
Subject code	621
Language	English
Publishing date	2023-10-01T00:00:00Z
Publisher	Springer
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Actinidia arguta (Sieb. et Zucc.) Planch. ex Miq.

Haifeng Zhang / Kun Teng / Hao Zang

Molecules, Vol 28, Iss 23, p

A Review of Phytochemistry and Pharmacology

2023 Volume 7820

Abstract: Actinidia arguta (Siebold & Zucc.) Planch ex Miq. ( A. arguta ) is a highly valued vine plant belonging to the Actinidia lindl genus. It is extensively utilized for its edible and medicinal properties. The various parts of A. arguta serve diverse ... ...

Abstract	Actinidia arguta (Siebold & Zucc.) Planch ex Miq. ( A. arguta ) is a highly valued vine plant belonging to the Actinidia lindl genus. It is extensively utilized for its edible and medicinal properties. The various parts of A. arguta serve diverse purposes. The fruit is rich in vitamins, amino acids, and vitamin C, making it a nutritious and flavorful raw material for producing jam, canned food, and wine. The flowers yield volatile oils suitable for essential oil extraction. The leaves contain phenolic compounds and can be used for tea production. Additionally, the roots, stems, and leaves of A. arguta possess significant medicinal value, as they contain a wide array of active ingredients that exert multiple pharmacological and therapeutic effects. These effects include quenching thirst, relieving heat, stopping bleeding, promoting blood circulation, reducing swelling, dispelling wind, and alleviating dampness. Comprehensive information on A. arguta was collected from scientific databases covering the period from 1970 to 2023. The databases used for this review included Web of Science, PubMed, ProQuest, and CNKI. The objective of this review was to provide a detailed explanation of A. arguta from multiple perspectives, such as phytochemistry and pharmacological effects. By doing so, it aimed to establish a solid foundation and propose new research ideas for further exploration of the plant’s potential applications and industrial development. To date, a total of 539 compounds have been isolated and identified from A. arguta . These compounds include terpenoids, flavonoids, phenolics, phenylpropanoids, lignin, organic acids, volatile components, alkanes, coumarins, anthraquinones, alkaloids, polysaccharides, and inorganic elements. Flavonoids, phenolics, alkaloids, and polysaccharides are the key bioactive constituents of A. arguta . Moreover, phenolics and flavonoids in A. arguta exhibit remarkable antioxidant, anti-inflammatory, and anti-tumor properties. Additionally, they show promising potential in ...
Keywords	Actinidia arguta (Sieb. et Zucc.) Planch. ex Miq ; secondary metabolites ; flavonoids ; phenolics ; pharmacological effects ; Organic chemistry ; QD241-441
Subject code	540
Language	English
Publishing date	2023-11-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A Completeness and Complementarity Analysis of the Data Sources in the NOAA In Situ Sea Surface Temperature Quality Monitor ( i Quam) System

Haifeng Zhang / Alexander Ignatov

Remote Sensing, Vol 13, Iss 3741, p

2021 Volume 3741

Abstract: In situ sea surface temperatures (SST) are the key component of the calibration and validation (Cal/Val) of satellite SST retrievals and data assimilation (DA). The NOAA in situ SST Quality Monitor ( i Quam) aims to collect, from various sources, all ... ...

Abstract	In situ sea surface temperatures (SST) are the key component of the calibration and validation (Cal/Val) of satellite SST retrievals and data assimilation (DA). The NOAA in situ SST Quality Monitor ( i Quam) aims to collect, from various sources, all available in situ SST data, and integrate them into a maximally complete, uniform, and accurate dataset to support these applications. For each in situ data type, i Quam strives to ingest data from several independent sources, to ensure most complete coverage, at the cost of some redundancy in data feeds. The relative completeness of various inputs and their consistency and mutual complementarity are often unknown and are the focus of this study. For four platform types customarily employed in satellite Cal/Val and DA (drifting buoys, tropical moorings, ships, and Argo floats), five widely known data sets are analyzed: (1) International Comprehensive Ocean-Atmosphere Data Set (ICOADS), (2) Fleet Numerical Meteorology and Oceanography Center (FNMOC), (3) Atlantic Oceanographic and Meteorological Laboratory (AOML), (4) Copernicus Marine Environment Monitoring Service (CMEMS), and (5) Argo Global Data Assembly Centers (GDACs). Each data set reports SSTs from one or more platform types. It is found that drifting buoys are more fully represented in FNMOC and CMEMS. Ships are reported in FNMOC and ICOADS, which are best used in conjunction with each other, but not in CMEMS. Tropical moorings are well represented in ICOADS, FNMOC, and CMEMS. Some CMEMS mooring reports are sampled every 10 min (compared to the standard 1 h sampling in all other datasets). The CMEMS Argo profiling data set is, as expected, nearly identical with those from the two Argo GDACs.
Keywords	i Quam ; in situ SST ; ICOADS ; FNMOC ; CMEMS ; AOML ; Science ; Q
Subject code	551
Language	English
Publishing date	2021-09-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A variable refractive index sensor based on epsilon-near-zero spatial selection structure and its potential in biological detection

Bao-Fei Wan / Hai-Ning Ye / Dan Zhang / Haifeng Zhang

New Journal of Physics, Vol 25, Iss 2, p

2023 Volume 023003

Abstract: In this paper, a spatially selective (SS) structure is investigated through the critical jump characteristic when the permittivity of the epsilon-negative (ENG) materials approaches zero. In the range where the incident frequency of the TE wave is 5.1–5 ... ...

Abstract	In this paper, a spatially selective (SS) structure is investigated through the critical jump characteristic when the permittivity of the epsilon-negative (ENG) materials approaches zero. In the range where the incident frequency of the TE wave is 5.1–5.6 c d ^−1 and that of the TM wave is 5.0–5.7 c d ^−1 , the transmittance exceeds 0.85 and the squareness factor (SF) surpasses 0.9. By adjusting the electronic plasma frequency to affect the position of epsilon-near-zero (ENZ) frequency, a wide-angle control of the SS characteristic extent is produced. Using the fragility of the critical angle to the background analyte medium, a variable refractive index sensor is proposed. When the electronic plasma frequency is continuously altered, the analyte with the measurement range of 1.1–1.3, 1.3–1.5, 1.5–1.7, or 1.7–1.9 can be detected. The corresponding sensitivity is 57.1 degrees/RIU, 48.8 degrees/RIU, 40.0 degrees/RIU, or 32.8 degrees/RIU. The elongation in the thickness of ENG materials contributes to the improvement of the SF, executing the discrimination of Vibrio cholera, E. coli , and Shigella flexneri . The effects of losses on device performance are also briefly considered. Different from previous studies, the proposed SS selective structure adopts a new ENZ mechanism, can simplify the design of the structure to a certain extent and has a possibility in the design of highly sensitive sensors.
Keywords	spatially selective structure ; epsilon-negative materials ; refractive index ; biosensor ; Science ; Q ; Physics ; QC1-999
Subject code	535
Language	English
Publishing date	2023-01-01T00:00:00Z
Publisher	IOP Publishing
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Boosting Electrocatalytic Oxidation of Formic Acid on Ir(IV)-Doped PdAg Alloy Nanodendrites with Sub-5 nm Branches

Gongguo Zhang / Yingying Wang / Yanyun Ma / Haifeng Zhang / Yiqun Zheng

Molecules, Vol 28, Iss 3670, p

2023 Volume 3670

Abstract: The formic acid oxidation reaction (FAOR) represents an important class of small organic molecule oxidation and is central to the practical application of fuel cells. In this study, we report the fabrication of Ir(IV)-doped PdAg alloy nanodendrites with ... ...

Abstract	The formic acid oxidation reaction (FAOR) represents an important class of small organic molecule oxidation and is central to the practical application of fuel cells. In this study, we report the fabrication of Ir(IV)-doped PdAg alloy nanodendrites with sub-5 nm branches via stepwise synthesis in which the precursors of Pd and Ag were co-reduced, followed by the addition of IrCl 3 to conduct an in situ galvanic replacement reaction. When serving as the electrocatalyst for the FAOR in an acidic medium, Ir(IV) doping unambiguously enhanced the activity of PdAg alloy nanodendrites and improved the reaction kinetics and long-term stability. In particular, the carbon-supported PdAgIr nanodendrites exhibited a prominent mass activity with a value of 1.09 A mg Pd −1 , which is almost 2.0 times and 2.7 times that of their PdAg and Pd counterparts, and far superior to that of commercial Pt/C. As confirmed by the means of the DFT simulations, this improved electrocatalytic performance stems from the reduced overall barrier in the oxidation of formic acid into CO 2 during the FAOR and successful d-band tuning, together with the stabilization of Pd atoms. The current study opens a new avenue for engineering Pd-based trimetallic nanocrystals with versatile control over the morphology and composition, shedding light on the design of advanced fuel cell electrocatalysts.
Keywords	electrocatalysts ; nanocrystals ; formic acid oxidation ; doping ; iridium ; Organic chemistry ; QD241-441
Subject code	660
Language	English
Publishing date	2023-04-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Validation of Himawari-8 Sea Surface Temperature Retrievals Using Infrared SST Autonomous Radiometer Measurements

Haifeng Zhang / Helen Beggs / Christopher Griffin / Pallavi Devidas Govekar

Remote Sensing, Vol 15, Iss 2841, p

2023 Volume 2841

Abstract: This study has evaluated five years (2016–2020) of Himawari-8 (H8) Sea Surface Temperature (SST) Level 2 Pre-processed (L2P) data produced by the Australian Bureau of Meteorology (Bureau) against shipborne radiometer SST measurements obtained from the ... ...

Abstract	This study has evaluated five years (2016–2020) of Himawari-8 (H8) Sea Surface Temperature (SST) Level 2 Pre-processed (L2P) data produced by the Australian Bureau of Meteorology (Bureau) against shipborne radiometer SST measurements obtained from the Infrared SST Autonomous Radiometer (ISAR) onboard research vessel RV Investigator. Before being used, all data sets employed in this study have gone through careful quality control, and only the most trustworthy measurements are retained. With a large matchup database (31,871 collocations in total, including 16,418 during daytime and 15,453 during night-time), it is found that the Bureau H8 SST product is of good quality, with a mean bias ± standard deviation (SD) of −0.12 °C ± 0.47 °C for the daytime and −0.04 °C ± 0.37 °C for the night-time. The performance of the H8 data under different environmental conditions, determined by the observations obtained concurrently from RV Investigator, is examined. Daytime and night-time satellite data behave slightly differently. During the daytime, a cold bias can be seen under almost all environmental conditions, including for most values of wind speed, SST, and relative humidity. On the other hand, the performance of the night-time H8 SST product is consistently more stable under most meteorological conditions with the mean bias usually close to zero.
Keywords	Himawari-8 ; sea surface temperature ; validation ; ISAR ; Science ; Q
Subject code	551
Language	English
Publishing date	2023-05-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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