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Spatio-temporal characteristics of human activities using location big data in Qilian Mountain National Park

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International Journal of Digital Earth 2023年第1期16卷 3794-3809页

作者： Minglu Che Yanyun Nian siwen chen Hao Zhang Tao Pei Key Laboratory of Western China’s Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhouPeople’s Republic of China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingPeople’s Republic of China University of Chinese Academy of Sciences BeijingPeople’s Republic of China

Human activities significantly impact the *** the patterns and distribution of these activities is crucial for ecological *** location-based technology advancement,big data such as location and trajectory data can be used to analyze human activities on finer temporal and spatial scales than traditional remote sensing *** this study,Qilian Mountain National Park(QMNP)was chosen as the research area,and Tencent location data were used to construct time series *** series clustering and decomposition were performed,and the spatio-temporal distribution characteristics of human activities in the study area were analyzed in conjunction with GPS trajectory data and land use *** study found two distinct human activity patterns,Pattern A and Pattern B,in *** to Pattern B,Pattern A had a higher volume of location data and clear nighttime *** incorporating land use and trajectory data,we conclude that Pattern A and Pattern B represent the activity patterns of the resident and tourist populations,***,the study identified seasonal variations in human activities,with human activity in summer being approximately two hours longer than in *** also conducted an analysis of human activities in different counties within the study area.

关键词： Location data spatial and temporal analysis time series clustering tourism studies social geography

Literature Review on Wireless Sensing Wi-Fi Signal-Based Recognition of Human Activities

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Tsinghua Science and Technology 2018年第2期23卷 203-222页

作者： Chao Wang siwen chen Yanwei Yang Feng Hu Fugang Liu Jie Wu Key laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data Science Shanghai University Shanghai 200444 China. Science and Technology Heilongjiang University Harbin 150022 China. Department of Computer and InformationSciences Temple University PA 19122-6096 USA.

With the rapid development and wide deployment of wireless technology, Wi-Fi signals have no longer been confined to the Internet as a communication medium. Wi-Fi signals will be modulated again by human actions when propagating indoors, carrying rich human body state information. Therefore, a novel wireless sensing technology is gradually emerging that can realize gesture recognition, human daily activity detection, identification,indoor localization and human body tracking, vital signs detection, imaging, and emotional recognition by extracting effective feature information about human actions from Wi-Fi signals. Researchers mainly use channel state information or frequency modulated carrier wave in their current implementation schemes of wireless sensing technology, called "Walls have eyes", and these schemes cover radio-frequency technology, signal processing technology, and machine learning. These available wireless sensing systems can be used in many applications such as smart home, medical health care, search-and-rescue, security, and with the high precision and passively device-free through-wall detection function. This paper elaborates the research actuality and summarizes each system structure and the basic principles of various wireless sensing applications in detail. Meanwhile, two popular implementation schemes are analyzed. In addition, the future diversely application prospects of wireless sensing systems are presented.

关键词： channel state information frequency modulated carrier wave human activities recognition wireless sensing applications Wi-Fi

Biodegradable implants based on photo-cross-linked aliphatic polycarbonates for long-acting contraception

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Journal of Materials Science & Technology 2023年第25期156卷 129-141页

作者： Zhipeng Hou Wei Xu siwen chen Jing Guo Peng Li Jianshe Hu Liqun Yang Jing chen Center for Molecular Science and Engineering College of ScienceNortheastern UniversityShenyang 110819China NHC Key Laboratory of Reproductive Health and Medical Genetics (China Medical University) Liaoning Research Institute of Family Planning (The Reproductive Hospital of China Medical University)Shenyang 110031China Department of Biomaterials Shengjing Hospital of China Medical UniversityShenyang 110004China Department of Obstetrics and Gynecology Shengjing Hospital of China Medical UniversityShenyang 110004China

In this study,a new class of biodegradable contraceptive implants was prepared via the UV irradiation molding method,among which,progestin levonorgestrel(LNG)was used as a model ***-cross-linked aliphatic polycarbonates(APCs),namely,poly(trimethylene carbonate-co-2,2′-dimethyltrimethylene carbonate)[P(TMC-co-DTC)]elastomers,were used as the drug delivery *** results obtained from the degradation experiments carried out in Sprague-Dawley(SD)rats showed that the cross-linked elastomer had the degradation characteristics of the surface erosion degradation mechanism,with no generation of acid degradation products,and excellent form-stability,which met the performance requirements of the matrix for a long-acting sustained-release delivery *** in vitro cytotoxicity tests and histological and immunohistochemical evaluations showed good biocompatibility and biosafety of the elastomer matrix material and contraceptive ***,the implant formulations were screened by in vitro release experiments,and their release kinetics were ***,in the evaluation study of the in vivo anti-fertility effect,the implants exhibited excellent dimensional stability and were degraded by a surface erosion *** achieved a stable and sustained release in female SD rats,maintaining a long-acting contraceptive duration of up to 4 *** contraceptive implants obtained in this study could be used to address the limitations of currently available formulations,which required secondary surgical removal and a single means of regulating drug release ***,these implants could provide a new option for birth control needs and may be of significance in reducing the incidence of induced abortion and protecting female fertility.

关键词： Aliphatic polycarbonates Photo-cross-linked Levonorgestrel Contraceptive implants Anti-fertility effects Sustained-release

The impact of the accumulation of algal blooms on reed wetlands in the littoral zones of Chaohu Lake

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Journal of Oceanology and Limnology 2022年第5期40卷 1750-1763页

作者： Shuzhan MA Yue WU siwen chen Bingfa chen cheng LIU Xiaozhi GU Xiaoli SHI Kaining chen State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Institute of Agricultural Resources and Environmental Sciences Jiangsu Academy of Agricultural SciencesNanjing 210014China Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou University of Science and TechnologySuzhou 215009China

In a large eutrophic lake,the littoral zone is normally an area with high-density elevated aquatic plant life,including algal blooms,where the presence of reed wetlands allows the accumulation of *** this study,the impact of accumulated algal blooms in reed wetlands in the littoral zone s of Chaohu Lake was investigated seasonally from 2018 to *** concentrations of chlorophyll a(Chl a),total nitrogen(TN),and total phosphorus(TP)were much higher in the reed-covered littoral zones(RCLZ)than in the unvegetated littoral zones(ULZ),indicating that more algal biomass was trapped and accumulated in the *** biomass could be horizontally transported to downwind littoral zones under low wind speeds,favoring the establishment of *** accumulation levels were highest in summer due to high water temperatures and algal ***,the northern littoral zones were conducive to the development of large algal blooms because of the wind *** values of TN,TP,Chl a,and loss on ignition in surface sediments were higher in the RCLZ than in the ***,the diffusive fluxes of ammonium and soluble reactive pho sphorus were also higher in the RCLZ than in the *** the capability of reed wetlands to trap algae,mechanical salvage and other physical methods should be adopted to eliminate algal biomass when massive blooms accumulate in the RCLZ.

关键词： Chaohu Lake littoral zone reed wetlands algal blooms

Response of phytoplankton functional group to spring drought in a large subtropical reservoir

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Journal of Oceanology and Limnology 2024年第5期42卷 1586-1596页

作者： Yue WU Qi YE siwen chen Kaining chen Shuzhan MA Yiheng CHANG Xiaoli SHI State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China State Environmental Protection Key Laboratory of Aquatic Ecosystem Health in the Middle and Lower Reaches of Yangtze River Jiangsu Provincial Academy of Environmental ScienceNanjing 210036China

Global warming has caused an increase in the frequency and duration of droughts *** could trigger large changes in physico-chemical conditions and phytoplankton community in waterbodies,resulting in a shift in the phytoplankton *** diatom blooms in reservoirs have been increasingly observed in the past decade in the Taihu Lake *** aim of the present study is to elucidate the impacts of droughts on aquatic environment and to determine the driving factors for the succession of the phytoplankton functional groups based on the analysis of data collected during spring from 2009 to 2020 in the Daxi *** unimodal relationship between 1-month aggregated precipitation index and phytoplankton species richness indicated the competitive exclusion occurred in extremely drought *** structural equation modeling indicated that drought-related low water level conditions intensified sediment resuspension,and increased the phosphorus-enriched nonalgal turbidity in the Daxi ***,a steady shift in the Reynolds phytoplankton functional groups from L 0,TD,J,X 2,and A(phytoplankton taxa preferring low turbidity and nutrient conditions)to TB(pennate diatoms being adapt to turbid and nutrient-rich conditions)was *** increased TP and non-algal turbidity in addition to the lowered disturbance contribute to the prevalence of Group *** the difficulties in nutrient control,timely water replenishment is often a feasible method of controlling the dominance of harmful algae for reservoir ***,alternative water sources are in high demand for ensuring ecological safety and water availability when dealing with drought.

关键词： drought reservoir sediments resuspension phytoplankton functional group diatom

Tumor microenvironments self-activated nanoscale metal-organic frameworks for ferroptosis based cancer chemodynamic/photothermal/chemo therapy

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Acta Pharmaceutica Sinica B 2021年第10期11卷 3231-3243页

作者： Yu Liang Li Zhang Chao Peng Shiyu Zhang siwen chen Xin Qian Wanxian Luo Qing Dan Yongyan Ren Yingjia Li Bingxia Zhao Department of Medicine Ultrasonics Nanfang HospitalSouthern Medical UniversityGuangzhou 510515China Guangzhou Key Laboratory of Tumor Immunology Research Cancer Research InstituteSchool of Basic Medical SciencesSouthern Medical UniversityGuangzhou 510515China Department of Cerebrovascular Diseases Zhuhai People’s Hospital(Zhuhai Hospital Affiliated with Jinan University)Zhuhai 519099China Central Laboratory Southern Medical UniversityGuangzhou 510515China

Ferroptosis,as a newly discovered cell death form,has become an attractive target for precision cancer *** ferroptosis therapy strategies based on nanotechnology have been reported by either increasing intracellular iron levels or by inhibition of glutathione(GSH)-dependent lipid hydroperoxidase glutathione peroxidase 4(GPX4).However,the strategy by simultaneous iron delivery and GPX4 inhibition has rarely been ***,novel tumor microenvironments(TME)-activated metal-organic frameworks involving Fe&Cu ions bridged by disulfide bonds with PEGylation(FCSP MOFs)were developed,which would be degraded specifically under the redox TME,simultaneously achieving GSH-depletion induced GPX4 inactivation and releasing Fe ions to produce ROS via Fenton reaction,therefore causing *** ROS could be generated by the acceleration of Fenton reaction due to the released Cu ions and the intrinsic photothermal capability of FCSP *** overexpressed GSH and H2O2 in TME could ensure the specific TME self-activated *** tumor therapeutic efficiency could be achieved by doxorubicin(DOX)loading since it can not only cause apoptosis,but also indirectly produce H2O2 to amplify Fenton *** anti-tumor effect of obtained FCSP@DOX MOFs was verified via both in vitro and in vivo assays.

关键词： Ferroptosis Tumor microenvironments Fenton reaction Metal-organic frameworks(MOFs) GSH depletion Drug delivery

Multi-Domain Image Super-Resolution Generative Adversarial Network for Low-Resolution Person Re-Identification

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Multi-Domain Image Super-Resolution Generative Adversarial N...

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作者： siwen chen Huaiyu Wu Yang chen Engineering Research Center for Metallurgical Automation and Measurement Technology of Ministry of Education Institute of Robotics and Intelligent Systems Wuhan University of Science and Technology

Person re-identification（ReID） is an important task in video surveillance *** address the issue that various low-resolutions and scale mismatching always exist in the real world,a multi-domain image-to-image translation network,termed Multi-Domain image Super-Resolution Generative Adversarial Network（MSRGAN）,is proposed to learn the mapping relationship between the various low-resolution domains and the high-resolution *** can ensure that the transferred image has a similar resolution as in the target *** is also able to keep the identity information of images from low-resolution domain during the *** addition,a novel ReID model,termed CSA-ReID in which channel attention and spatial attention module are introduced,is designed to learn resolution-invariant deep *** proposed method achieves 90.7% rank-1 accuracy and 96.4% rank-5 accuracy on multiple low-resolutions Market-1501 *** experimental results prove that the proposed method achieves promising generalization ability and accuracy compared with the state-of-theart methods.

关键词： person re-identification cross-resolution super-resolution attention

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移动双柔性梁系统的振动主动控制

振动．测试与诊断 2022年第1期42卷 62-67,194页

作者：邱志成陈思文华南理工大学机械与汽车工程学院广州510641

以弹簧连接移动双柔性梁系统为实验对象,研究多柔体系统的振动特性和振动主动控制问题。针对移动双柔性梁系统存在建模的复杂性和耦合非线性等问题,基于系统的动态线性化数据模型,研究无模型自适应控制算法在多柔体振动主动控制领域的... 详细信息

以弹簧连接移动双柔性梁系统为实验对象,研究多柔体系统的振动特性和振动主动控制问题。针对移动双柔性梁系统存在建模的复杂性和耦合非线性等问题,基于系统的动态线性化数据模型,研究无模型自适应控制算法在多柔体振动主动控制领域的应用。设计并搭建移动双柔性梁实验平台,进行基于压电驱动器和伺服电机混合控制的双柔性梁振动抑制实验研究。实验结果表明,无模型自适应控制器可实现对振动的快速抑制。

关键词：双柔性梁系统振动主动控制无模型自适应控制混合控制

Rate-dependent Hammerstein Model and H∞-robust Tracking Control for Linear Reluctance Actuator

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Rate-dependent Hammerstein Model and H∞-robust Tracking Con...