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一种简单可靠的昆虫扑翼运动图像序列自动分析方法

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实验流体力学 2011年第1期25卷 42-47页

作者：魏榛杨基明 c.P.Ellington 中国科学技术大学安徽合肥230027 剑桥大学

目前高速摄影相机和多相机系统广泛地用于记录昆虫奇妙的飞行运动,然而分析这些运动图像序列的方法却不能让人满意。提出并测试了一种简单可靠的昆虫飞行图像的自动分析方法。该方法充分地利用了图像序列中相邻两帧间的差别,可自动提取... 详细信息

目前高速摄影相机和多相机系统广泛地用于记录昆虫奇妙的飞行运动,然而分析这些运动图像序列的方法却不能让人满意。提出并测试了一种简单可靠的昆虫飞行图像的自动分析方法。该方法充分地利用了图像序列中相邻两帧间的差别,可自动提取出昆虫的特征点(翼尖点,翼根点,头部端点,腹部端点)和轮廓线(翼前缘轮廓,翼后缘轮廓)。采用MATLAB实现并使用虚拟昆虫和真实昆虫运动图像序列测试了该方法。测试结果表明,该方法简单可靠,无需人工干预,不针对特定昆虫,运算量也较小,且能够提供较好的识别结果,甚至在处理昆虫的身体和翅膀部分重叠或者昆虫的翅膀图像呈现明显的透明的图像序列时候结果依然不错。该方法给昆虫图像的形态学特征自动识别难题提供了一个切实可行的解决方法,节省了昆虫扑翼运动图像的分析时间。

关键词：扑翼飞行高速摄影运动识别自动图像分析

Accelerated oxidation of VOcs via vacuum ultraviolet photolysis coupled with wet scrubbing process

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Journal of Environmental Sciences 2023年第12期134卷 55-64页

作者： Ruijie Xie Dongxue Lei Xiaowen Xie Ziyi Suo Dennis Y.c.Leung Jianping cao Fang Ruimei Haibao Huang School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Department of Mechanical Engineering University of Hong KongHong Kong 999077China college of Environment and Resources Chongqing Technology and Business UniversityChongqing 400067China Scientific Research Academy of GuangXi Environmental Protection Nanning 530022China

Vacuum ultraviolet(VUV) photolysis is a facile method for volatile organic compounds(VOcs) elimination, but is greatly limited by the relatively low removal efficiency and the possible secondary pollution. To overcome above drawbacks, we developed an efficient method for VOcs elimination via VUV photolysis coupled with wet scrubbing process. In this coupled process, volatile toluene, a representative of VOcs, was oxidized by the gas-phase VUV photolysis, and then scrubbed into water for further oxidation by the liquid-phase VUV photolysis. More than 96% of toluene was efficiently removed by this coupled process, which was 2 times higher than that in the gas-phase VUV photolysis. This improvement was attributed to the synergistic effect between gas-phase and liquid-phase VUV photolysis. O3and HO·are the predomination reactive species for the toluene degradation in this coupled process, and the generation of O3in gas-phase VUV photolysis can efficiently enhance the HO·production in liquid-phase VUV photolysis. The result from in-situ proton transfer reaction ionization with mass analyzer(PTR-MS) further suggested that most intermediates were trapped by the wet scrubbing process and efficiently oxidized by the liquid-phase VUV photolysis, showing a high performance for controlling the secondary pollution. Furthermore, the result of stability test and the reuse of solution demonstrated that this coupled process has a highly stable and sustainable performance for toluene degradation. This study presents an environmentally benign and highly efficient VUV photolysis for gaseous VOcs removal in the wet scrubbing process.

关键词： Volatile organic compounds(VOcs) Vacuum ultraviolet(VUV)photolysis Wet scrubbing process Toluene degradation Intermediates analysis

Annual yields of multispecies grassland mesocosms outperformed monocultures across a drought gradient due to complementarity effects and rapid recovery

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Grassland Research 2023年第4期2卷 309-321页

作者： Eamon Haughey Jennifer c.McElwain John A.Finn Department of Natural Resources and the Environment Atlantic Technological UniversityGalwayIreland Botany Department School of Natural SciencesTrinity College DublinDublinIreland Teagasc Environment Research CentreJohnstown CastleWexfordIreland

Background:More frequent and severe drought events due to climate change pose a major challenge for sustainable forage production in managed *** study investigated whether multispecies grassland communities can provide greater resistance to and/or recovery from drought compared to monoculture ***:Mesocosms of Lolium perenne L.,cichorium intybus L.,Trifolium repens *** Trifolium pratense *** established as monocultures,and a four-species mixture.A drought gradient with five levels of water supply ranging from a mild to a severe treatment was applied for 10 weeks,in each of 2 *** biomass was harvested to assess drought resistance,drought recovery and annual *** mass density and specific root length were measured in Year ***:Across the drought gradient,four-species communities had significantly larger annual yields than each of the four monocultures,indicating transgressive *** was despite relatively low drought resistance for four-species communities compared with *** and *** *** of yields following drought was high for all ***:Multispecies swards with complementary traits can provide a viable adaptation option across a wide range of drought *** of a stress gradient methodology allowed a more detailed understanding of stress responses.

关键词： climate change drought forage production functional biodiversity perturbation gradient resilience root traits

The Security Area, A New Approach To Acupunctural Points

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华西医学 1992年第4期 493-494页

作者： E caligiuri Dipl.Eng.c Traian

(一) This article is introducing a new type of cutaneous area presenting increased electropermeadility,the SEcURITY AREA. For a better understanding, the article is presenting a comparative study between the SEcURITY ... 详细信息

关键词： The Security Area A New Approach To Acupunctural Points

Blockchain-Assisted Secure Fine-Grained Searchable Encryption for a cloud-Based Healthcare cyber-Physical System

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IEEE/cAA Journal of Automatica Sinica 2021年第12期8卷 1877-1890页

作者： Mamta Brij B.Gupta Kuan-ching Li Victor c.M.Leun Kostas E.Psannis Shingo Yamaguchi IEEE the Department of computer Engineering National Institute of Technology the Asia University the Macquarie University the Department of computer Science and Information Engineering Providence University the computer Science and Software Engineering Shenzhen University the University of British columbia the Department of Applied Informatics University of Macedonia the Graduate School of Sciences and Technology for Innovation Yamaguchi University

The concept of sharing of personal health data over cloud storage in a healthcare-cyber physical system has become popular in recent times as it improves access *** privacy of health data can only be preserved by keeping it in an encrypted form,but it affects usability and flexibility in terms of effective ***-based searchable encryption(ABSE)has proven its worth by providing fine-grained searching capabilities in the shared cloud ***,it is not practical to apply this scheme to the devices with limited resources and storage capacity because a typical ABSE involves serious *** a healthcare cloud-based cyber-physical system(ccPS),the data is often collected by resource-constraint devices;therefore,here also,we cannot directly apply ABSE *** the proposed work,the inherent computational cost of the ABSE scheme is managed by executing the computationally intensive tasks of a typical ABSE scheme on the blockchain ***,it makes the proposed scheme suitable for online storage and retrieval of personal health data in a typical *** the assistance of blockchain technology,the proposed scheme offers two main ***,it is free from a trusted authority,which makes it genuinely decentralized and free from a single point of ***,it is computationally efficient because the computational load is now distributed among the consensus nodes in the blockchain ***,the task of initializing the system,which is considered the most computationally intensive,and the task of partial search token generation,which is considered as the most frequent operation,is now the responsibility of the consensus *** eliminates the need of the trusted authority and reduces the burden of data users,***,in comparison to existing decentralized fine-grained searchable encryption schemes,the proposed scheme has achieved a significant reduction in storage and computational cost for the secret

关键词： cloud-based cyber-physical systems(ccPS) data encryption healthcare information search and retrieval keyword search public-key cryptosystems searchable encryption

Insight into the mechanisms of trichloronitromethane formation by vacuum ultraviolet: QSAR model and FTIcR-MS analysis

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Journal of Environmental Sciences 2023年第3期125卷 215-222页

作者： Xiaojun chen Yangtao Wu Weiqiu Zhang Lingjun Bu Shumin Zhu Da Sheng Shiqing Zhou John c.crittenden Key Laboratory of Building Safety and Energy Efficiency Ministry of EducationDepartment of Water Engineering and ScienceCollege of Civil EngineeringHunan UniversityChangsha 410082China School of civil and Environmental Engineering and the Brook Byers Institute for Sustainable Systems Georgia Institute of TechnologyGeorgia 30332USA

Vacuum ultraviolet(VUV) photolysis is recognized as an environmental-friendly treatment process. Nitrate(NO-3) and natural organic matter(NOM) are widely present in water *** investigated trichloronitromethane(TcNM) formation during chlorination after VUV photolysis, because TcNM is an unregulated highly toxic disinfection byproduct. In this study:(1) we found reactive nitrogen species that is generated under VUV photolysis of NO-3react with organic matter to form nitrogen-containing compounds and subsequently form TcNM during chlorination;(2) we found the mere presence of 0.1 mmol/L NO-3can result in the formation of up to 63.96 μg/L TcNM;(3) we found the changes in pH(6.0-8.0), chloride(1-4 mmol/L), and bicarbonate(1-4 mmol/L) cannot effectively diminish TcNM formation;and,(4) we established the quantitative structure-activity relationship(QSAR) model,which indicated a linear relationship between TcNM formation and the Hammett constant(σ) of model compounds;and,(5) we characterized TcNM precursors in water matrix after VUV photolysis and found 1161 much more nitrogen-containing compounds with higher aromaticity were generated. Overall, this study indicates more attention should be paid to reducing the formation risk of TcNM when applying VUV photolysis process at scale.

关键词： Vacuum ultraviolet Natural organic matter Hammett constant FTIcR-MS Trichloronitromethane

Groundwater vulnerability assessment using a GIS-based DRASTIc method in the Erbil Dumpsite area (Kani Qirzhala), central Erbil Basin, North Iraq

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Journal of Groundwater Science and Engineering 2024年第1期12卷 16-33页

作者： Masoud H Hamed Rebwar N Dara Marios c Kirlas Department of Earth Sciences and Petroleum College of ScienceSalahaddin University-ErbilErbilIraq Department of Petroleum Engineering College of EngineeringKnowledge UniversityErbilIraq Department of Agriculture Faculty of AgricultureForestry and Natural EnvironmentAristotle University of Thessaloniki

Groundwater vulnerability assessment is a crucial step in the efficient management of groundwater resources,especially in areas with intensive anthropogenic activities and groundwater *** the present study,the DRASTIc method was applied using Geographic Information System(GIS)to delineate groundwater vulnerability zones in the Erbil Dumpsite area,central Erbil Basin,North *** showed that the area was classified into four vulnerability classes:Very low(16.97%),low(27.67%),moderate(36.55%)and high(18.81%).The southern,south-eastern and northern parts of the study area exhibited the highest vulnerability potential,while the central-northern,northern and north-western regions displayed the lowest vulnerability ***,results of the single-parameter sensitivity analysis indicated that amongst the seven DRASTIc parameters,the unsaturated zone and the aquifer media were the most influencing *** conclustion,the correlation of 25 nitrate concentration values with the final vulnerability map,assessed using the Pearson correlation coefficient,yielded a satisfactory result of R=0.72.

关键词： DRASTIc Erbil Iraq Groundwater vulnerability assessment Nitrate Pollution Sensitivity analysis

On the design of an AI-driven secure communication scheme for internet of medical things environment

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Digital communications and Networks 2023年第5期9卷 1080-1089页

作者： Neha Garg Rajat Petwal Mohammad Wazid D.P.Singh Ashok Kumar Das Joel J.P.c.Rodrigues Department of computer Science and Engineering Graphic Era Deemed to be UniversityDehradun248002India center for Security Theory and Algorithmic ResearchInternational Institute of Information TechnologyHyderabad500032India college of computer Science and Technology China University of Petroleum(East China)Qingdao266555China Instituto de Telecomunicaçoes 6201-001CovilhaPortugal

The Internet of Medical Things(IoMT)is a collection of smart healthcare devices,hardware infrastructure,and related software applications,that facilitate the connection of healthcare information technology system via the *** is also called IoT in healthcare,facilitating secure communication of remote healthcare devices over the Internet for quick and flexible analysis of healthcare *** other words,IoMT is an amalgam of medical devices and applications,which improves overall healthcare ***,this system is prone to securityand privacy-related attacks on healthcare ***,providing a robust security mechanism to prevent the attacks and vulnerability of IoMT is *** mitigate this,we proposed a new Artificial-Intelligence envisioned secure communication scheme for *** discussed network and threat models provide details of the associated network arrangement of the IoMT devices and attacks relevant to ***,we provide the security analysis of the proposed scheme to show its security against different possible ***,a comparative study of the proposed scheme with other similar schemes is *** results show that the proposed scheme outperforms other similar schemes in terms of communication and computation costs,and security and functionality ***,we provide a pragmatic study of the proposed scheme to observe its impact on various network performance parameters.

关键词： Internet of Medical Things(IoMT) Security Authentication and key agreement Artificial Intelligence(AI) Big data analytics

In vitro calcification studies on bioprosthetic and decellularized heart valves under quasi-physiological flow conditions

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Bio-Design and Manufacturing 2021年第1期4卷 10-21页

作者： cristian c.D’Alessandro Andreas Dimopoulos Sofia Andriopoulou Gerasimos A.T.Messaris Sotirios Korossis Petros Koutsoukos Dimosthenis Mavrilas Laboratory of Biomechanics and Biomedical Engineering Department of Mechanical Engineering and AeronauticsUniversity of PatrasPatrasGreece Department of cardiothoracic Transplantation and Vascular SurgeryHannover Medical SchoolHannoverGermany Department of Medical Physics University Hospital of PatrasPatrasGreece Wolfson School of Mechanical Electrical and Manufacturing EngineeringLoughborough UniversityLoughboroughUK Department of chemical Engineering University of PatrasPatrasGreece FORTH-Institute of chemical Engineering Sciences PatrasGreece

The lifespan of biological heart valve prostheses available in the market is limited due to structural alterations caused by calcium phosphate deposits formed from blood plasma in contact with the *** objective of this work is to present a comparative methodology for the investigation of the formation of calcium phosphate deposits on bioprosthetic and tissue-engineered scaffolds in vitro and the influence of mechanical forces on tissue *** on earlier investigations on biological mineralization at constant supersaturation,a circulatory loop simulating dynamic blood flow and physiological pressure conditions was *** system was appropriately adapted to evaluate the calcification potential of decellularized(DcV)and glutaraldehyde-fixed(GAV)porcine aortic *** indicated that DcV calcified at higher,statistically nonsignificant,rates in comparison with *** difference was attributed to the tissue surface modifications and cell debris leftovers from the decellularization *** analysis of the solids deposited after 20 h by scanning electron microscopy in combination with chemical microanalysis electron-dispersive spectroscopy identified the solid formed as octacalcium phosphate(ca8(PO4)6H2·5H2O,OcP).OcP crystallites were preferentially deposited in high mechanical stress areas of the test ***,GAV tissues developed a significant transvalvular pressure gradient increase past 36 h with a calcium deposition distribution similar to the one found in explanted *** conclusion,the presented in vitro circulatory model serves as a valuable prescreening methodology for the investigation of the calcification process of bioprosthetic and tissue-engineered valves under physiological mechanical load.

关键词： Reactors calcification constant composition reactor Heart valve In vitro Mechanical load Tissue engineering