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Resurgence of measles virus infection in an eliminated country, Sri Lanka
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作者 Merennage Anusha Yasanthi Fernando Gankandage Prabhath Chathuranga +2 位作者 Kaanthaka Gunaradha Abeygunasekara Dedunu Dias Weligamage Janaki Indira Abeynayake 《Asian Pacific Journal of Tropical Medicine》 SCIE CAS 2024年第5期208-213,共6页
Objective:To describe the situation of measles in Sri Lanka from May to November,2023 and to define the role of virology laboratory towards case confirmation and epidemiological and genetic characterization of the out... Objective:To describe the situation of measles in Sri Lanka from May to November,2023 and to define the role of virology laboratory towards case confirmation and epidemiological and genetic characterization of the outbreak.Methods:This retrospective study analyzed all samples tested for measles from 1st of May to 30th of November,2023 at National Measles Rubella Laboratory,Sri Lanka.According to the World Health Organization(WHO)algorithm,serum and oropharyngeal/nasopharyngeal swabs were tested with WHO recommended kits for anti-measles IgM and measles virus specific RNA,respectively.Selected RNA positive samples were sequenced at reference laboratory,India.Analysis of sequencing data and construction of phylogenetic tree were carried out at National Measles Rubella Laboratory.Data was analyzed using descriptive statistics.Results:Of the total 1132 serum samples and 497 oropharyngeal/nasopharyngeal swabs from 1326 patients,657(49.5%)patients were confirmed as measles by anti-measles IgM,measles virus specific RNA or both.Males(55.6%,n=365)and the age group from>20 to≤30 years(33.0%,n=217)predominated positive patients.All provinces reported measles positive cases.All samples sequenced(100%,n=42)were genotype D8 with 95.2%(n=40)bearing Victoria.Australia origin.Conclusions:We described resurgence of measles in an eliminated country,confirming the genotype to be D8,one of the two genotypes currently circulating globally.Further,the study strongly convinced the importance of a strengthened virological surveillance system in an eliminated country,despite its eliminated status. 展开更多
关键词 Measles elimination Resurgence of measles Sri Lanka Genotype D8 National Measles Rubella Laboratory
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Erratum to Can physical activity eliminate the mortality risk associated with poor sleep?A 15-year follow-up of 341,248 MJ Cohort participants[J Sport Health Sci 11(2022)596-604]
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《Journal of Sport and Health Science》 SCIE CSCD 2023年第1期145-146,共2页
This is an erratum to our published paper entitled“Can physical activity eliminate the mortality risk associated with poor sleep?A 15-year follow-up of 341,248 MJ Cohort participants”.In the paper mentioned above,th... This is an erratum to our published paper entitled“Can physical activity eliminate the mortality risk associated with poor sleep?A 15-year follow-up of 341,248 MJ Cohort participants”.In the paper mentioned above,there are some errors that we want to clear in this erratum.On page 601,2 reference lines(i.e.,HR=1)in(A)and(B)of Fig.1 were not labeled.The details are as follows. 展开更多
关键词 eliminate DETAILS mentioned
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Bone palsy eliminates granules to regulate Wnt/PI3K-AKT signaling pathway and intervene in hormonal osteonecrosis of the femoral head in rabbits
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作者 LI Sheng ZHU Cai-yu +4 位作者 GU Yi-fan ZHU Lei LI Zi-peng CHEN Shao-qi ZHOU Zheng-xin 《Journal of Hainan Medical University》 CAS 2023年第7期44-50,共7页
Objective:To investigate the therapeutic effect of osteopathic osteopathy on hormonal osteonecrosis in rabbits by regulating the Wnt/PI3K-AKT signaling pathway.Methods:Thirty clean-grade New Zealand rabbits were rando... Objective:To investigate the therapeutic effect of osteopathic osteopathy on hormonal osteonecrosis in rabbits by regulating the Wnt/PI3K-AKT signaling pathway.Methods:Thirty clean-grade New Zealand rabbits were randomly divided into control group,model group and experimental group,and all except for the control group,allogeneic serum combined with glucocorticoids were used to establish animal models of simulated hormonal osteonecrosis of the femoral head.After successful modeling,the experimental group was given the model group and the control group the same amount of normal saline,and the experimental group was given bone palsy granule concentrate according to the equivalent dose of humans and rabbits,once a day for 8 weeks,and after intraperitoneal anesthesia,blood was collected from the extracorporeal heart and the serum ALP and TGF-β1 levels were detected by immunoenzyme-linked adsorption.The experimental animals were sacrificed,,and the bilateral femoral heads of rabbits were removed for hematoxylin-eosin staining,and the apoptosis of cells in the femoral head area was observed by TUNEL staining.RT-qPCR analyzed the expression of Bax and Bcl-2 genes,and Western blot detected the expression levels of pathway proteins Wnt,β-catenin,GSK-3β,AKT and p-AKT.Results:Compared with the control group,the expression levels of ALP and TGF-β1 in rabbit bone tissue in the model group decreased significantly(P<0.05),the bone trabeculae were sparse and thinned,the number of hollow bone fosses and the number of apoptosis-positive cells increased significantly(P<0.05),the expression of pro-apoptotic gene Bax was increased,and the expression of anti-apoptotic gene Bcl-2 was inhibited(P<0.05).After the intervention and treatment of bone palsy granules,the hollow bone depression and apoptosis of rabbit bone tissue in the experimental group were effectively improved(P<0.05).In addition,compared with the model group,the osteopathic elimination particles could upregulate the expression of ALP and TGF-β1(P<0.05),promote the expression of pathway proteins Wnt andβ-catenin,increase the phosphorylation level of AKT,and downregulate the expression of GSK-3β(P<0.05).Conclusion:Under glucocorticoids,osteoblast development dysfunction and apoptosis increase.Bone palsy granules can regulate the two signaling pathways of Wnt/PI3K-AKT,promote osteoblast development and inhibit apoptosis,effectively maintain bone metabolic balance,prolong the collapse time of the femoral head,and further treat osteonecrosis of the femoral head. 展开更多
关键词 Osteonecrosis of the femoral head Bone palsy eliminates granules GLUCOCORTICOIDS OSTEOBLASTS GSK-3β
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An Analysis of the Expectations Gap:Can it be eliminated?
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作者 旷群 《海外英语》 2011年第1X期286-288,共3页
The "expectations gap" signifies the differences between what the public expects from an audit and what the auditing profession prefers the audit objectives to be.Although the gap exists,it seems that the pr... The "expectations gap" signifies the differences between what the public expects from an audit and what the auditing profession prefers the audit objectives to be.Although the gap exists,it seems that the professions trust that it could be eliminated.In this paper,further evidence was provided to deny the above point by exploring the inevitability nature and the structure of the audit expectation gap.In addition,the author concludes that expectations gap cannot be eliminated;instead,the only thing can be done is to narrow down the gap. 展开更多
关键词 EXPECTATION GAP eliminate NARROW DOWN
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Study and Design of a DC/AC Energy Converter for PV System Connected to the Grid Using Harmonic Selected Eliminated (HSE) Approach 被引量:1
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作者 Dominique Bonkoungou Éric Korsaga +3 位作者 Toussaint Guingané Sosthène Tassembédo Zacharie Koalaga François Zougmoré 《Open Journal of Applied Sciences》 2022年第3期301-316,共16页
Nowadays, distributing network-connected photovoltaic (PV) systems are expanded by merging a PV system and a Direct Current (DC)/Alternating Current (AC) energy converter. DC/AC conversion of PV energy is in great dem... Nowadays, distributing network-connected photovoltaic (PV) systems are expanded by merging a PV system and a Direct Current (DC)/Alternating Current (AC) energy converter. DC/AC conversion of PV energy is in great demand for AC applications. The supply of electrical machines and transfer energy to the distribution network is a typical case. In this work, we study and design a DC/AC energy converter using harmonic selective eliminated (HSE) method. To this end, we have combined two power stages connected in derivation. Each power stage is constituted of transistors and transformers. The connection by switching of the two rectangular waves, delivered by each of the stages, makes it possible to create a quasi-sinusoidal output voltage of the inverter. Mathematical equations based on the current-voltage characteristics of the inverter have been developed. The simulation model was validated using experimental data from a 25.2 kWp grid-coupled (PV) system, connected to Gridfit type inverters. The data were exported and implemented in programming software. A good agreement was observed and this shows all the robustness and the technical performances of the energy converter device. It emerges from this analysis that the inverter output voltage and the phase angle thus simulated are very important to control in order to orientate the transfer of the power flow from the continuous cell to cell to the alternating part. Simulated and field-testing results also show that increases in the value of the modulation factor (m) for low power output are highly significant. This study is an important tool for DC/AC inverter designers during initial planning stages. A short presentation of the design model of the inverter has been proposed in this article. 展开更多
关键词 Inverter Modulation Index TRANSISTORS Power Stage Harmonic Selective eliminated Photovoltaic (PV) System
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Failure of space spraying to eliminate dengue virus-infected Aedes aegypti may explain failure to prevent secondary cases in Southern Thailand
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作者 Kemmapon Chumchuen Theerakamol Pengsakul +2 位作者 Edward B McNeil Natthaphon Nanakorn Virasakdi Chongsuvivatwong 《Asian Pacific Journal of Tropical Medicine》 SCIE CAS 2021年第8期378-380,共3页
Dengue is a febrile disease caused by a member of the Flaviviridae family called dengue virus(DENV).DENV is primarily transmitted to humans by blood ingestion of Aedes(Ae.)aegypti[1,2].Space spraying is a vector contr... Dengue is a febrile disease caused by a member of the Flaviviridae family called dengue virus(DENV).DENV is primarily transmitted to humans by blood ingestion of Aedes(Ae.)aegypti[1,2].Space spraying is a vector control measure recommended by the World Health Organization(WHO)for eliminating vector mosquitos and preventing further infections in an epidemic setting[3]. 展开更多
关键词 aegypti INFECTED eliminate
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Nanjing Decided to Eliminate Incandescent Lamp Within a Limited Time
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《Electricity》 1996年第2期25-25,共1页
According to the notice of the Office of Planned, Safe and Effective Use of Electricity (short as OPSEUE), all non-industrial consumers, such as hotels, shopping centers, are asked to use energy saving lamps instead o... According to the notice of the Office of Planned, Safe and Effective Use of Electricity (short as OPSEUE), all non-industrial consumers, such as hotels, shopping centers, are asked to use energy saving lamps instead of incandescent lamp and to eliminate inductive ballasts within the coming 3 years. 展开更多
关键词 LAMPS instead eliminate NANJING INDUCTIVE asked SAVING SHOPPING CENTERS notice
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BOOSTING CHINA-ASEAN PUBLIC HEALTH COOPER ATION The push to eliminate COVID-19 globally as soon as possible
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《China Report ASEAN》 2021年第6期52-55,共4页
The novel coronavirus continues to rage around the world.Cooperation on vaccine research and development is key to a global response.On May 21,Chinese President Xi Jinping attended the Global Health Summit via video a... The novel coronavirus continues to rage around the world.Cooperation on vaccine research and development is key to a global response.On May 21,Chinese President Xi Jinping attended the Global Health Summit via video and delivered an important speech announcing new measures that China will take to promote global solidarity in the fight against the virus:China will provide an additional US$3 billion in international aid over the next three years to support COVID-19 response and economic and social recovery in other developing countries.It will continue sharing vaccines with the world after having supplied 300 million doses.China will support the transfer of vaccine technologies to other developing countries and carry out joint production on them. 展开更多
关键词 CONTINUE eliminate globally
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State Administration for Industryand Commerce to Eliminate Local Protectionism
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作者 Yang Wei 《China's Foreign Trade》 2000年第8期7-7,共1页
关键词 DOWN State Administration for Industryand Commerce to eliminate Local Protectionism
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New approach to eliminate structural redundancy in case resource pools using α mutual information 被引量:6
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作者 Man Xu Haiyan Yu Jiang Shen 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2013年第4期625-633,共9页
Structural redundancy elimination in case resource pools (CRP) is critical for avoiding performance bottlenecks and maintaining robust decision capabilities in cloud computing services. For these purposes, this pape... Structural redundancy elimination in case resource pools (CRP) is critical for avoiding performance bottlenecks and maintaining robust decision capabilities in cloud computing services. For these purposes, this paper proposes a novel approach to ensure redundancy elimination of a reasoning system in CRP. By using α entropy and mutual information, functional measures to eliminate redundancy of a system are developed with respect to a set of outputs. These measures help to distinguish both the optimal feature and the relations among the nodes in reasoning networks from the redundant ones with the elimination criterion. Based on the optimal feature and its harmonic weight, a model for knowledge reasoning in CRP (CRPKR) is built to complete the task of query matching, and the missing values are estimated with Bayesian networks. Moreover, the robustness of decisions is verified through parameter analyses. This approach is validated by the simulation with benchmark data sets using cloud SQL. Compared with several state-of-the-art techniques, the results show that the proposed approach has a good performance and boosts the robustness of decisions. 展开更多
关键词 case resource pool (CRP) knowledge reasoning redundancy elimination α mutual information robust decision.
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Applying a global pulse disturbance to eliminate spiral waves in models of cardiac muscle
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作者 高见 顾长贵 杨会杰 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第7期157-162,共6页
Removal of spiral waves in cardiac muscle is necessary because of their threat to life.Common methods for this removal are to apply a local disturbance to the media,such as a periodic forcing.However,most of these met... Removal of spiral waves in cardiac muscle is necessary because of their threat to life.Common methods for this removal are to apply a local disturbance to the media,such as a periodic forcing.However,most of these methods accelerate the beating of the cardiac muscle,resulting in the aggravation of the ventricular tachycardia,which directly threatens life.In the present study,in order to clear off spiral waves,a global pulse-disturbance is applied to the media based on three models of cardiac muscle.It is found that the spiral waves are eliminated and the frequency of the cardiac muscle is decreased in a short time,and finally,the state of the medium reaches the normal oscillation,which supports a target waves.Our method sheds light on the removal of spiral waves in cardiac muscle and can prevent the ventricular tachycardia as well as the ventricular fibrillation. 展开更多
关键词 ventricular fibrillation spiral wave pattern formation ELIMINATION
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Targeted nanostrategies eliminate pre-metastatic niche of cancer
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作者 Juan Wang Ning Zhang +5 位作者 Xiuping Ding Chengrui Fu Xiaodong Li Baosheng Li Jianxun Ding Tianmeng Sun 《Nano Research》 SCIE EI CSCD 2024年第6期5358-5373,共16页
Establishing a pre-metastatic niche(PMN)in secondary organs is a prerequisite for cancer metastases.Despite advances in cancer therapy,the efficient inhibition of PMN formation remains a clinical challenge.Recent adva... Establishing a pre-metastatic niche(PMN)in secondary organs is a prerequisite for cancer metastases.Despite advances in cancer therapy,the efficient inhibition of PMN formation remains a clinical challenge.Recent advances in understanding the specific characteristics of PMN and advances in nanotechnology have provided hope for manipulating their microenvironments.A series of nanostrategies have been designed to eliminate the PMN,including the removal of pro-metastatic exosomes from the bloodstream for excretion via the intestines,the targeting and scavenging of myeloid-derived suppressor cells,fibroblasts,and critical extracellular matrix components,and the elimination of circulating tumor cells prior to colonization in distant organs.This review summarizes the underlying mechanisms of PMN formation,highlights the anti-PMN efficacy of currently reported nanostrategies,and underlines the unresolved questions. 展开更多
关键词 nanoparticle controlled drug delivery pre-metastatic niche elimination metastasis suppression cancer therapy
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Modeling mitochondria,where are the numbers?
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作者 Adrian M.Davies Alan G.Holt 《Neural Regeneration Research》 SCIE CAS CSCD 2024年第7期1435-1436,共2页
Models and simulations are particularly useful for exploring ideas and concepts in the biological sciences that are expe rimentally impracticable.in silico methods are also gaining acceptance with regulatory authoriti... Models and simulations are particularly useful for exploring ideas and concepts in the biological sciences that are expe rimentally impracticable.in silico methods are also gaining acceptance with regulatory authorities as an alternative to animal testing.For example,the Environmental Protection Agency aims to eliminate animal testi ng by 2035. 展开更多
关键词 eliminate authorities ACCEPTANCE
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美国《保健物理》(Health Physics)杂志英文摘要(2023年126卷第5期)
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《辐射防护》 CAS CSCD 北大核心 2024年第4期437-440,共4页
High-rate Gamma Spectrometry Using a LaBr_(3)(Ce)Scintillator with a Fast Pulse Shaping.Tianyi Ren1,2,Soo Hyun Byun1,2(1.Department of Physics and Astronomy,McMaster University,Hamilton,ON,L8S 4K1,Canada;2.Radiation S... High-rate Gamma Spectrometry Using a LaBr_(3)(Ce)Scintillator with a Fast Pulse Shaping.Tianyi Ren1,2,Soo Hyun Byun1,2(1.Department of Physics and Astronomy,McMaster University,Hamilton,ON,L8S 4K1,Canada;2.Radiation Sciences Graduate Program,McMaster University,Hamilton,ON,L8S 4K1,Canada)Abstract:The performance of a LaBr_(3)(Ce)gamma spectrometer at high count rates was investigated up to an input count rate of 1.3 Mcps.In order to make its pulse processing faster,a preamplifier provided by the detector manufacturer was eliminated,and the signal from the photomultiplier tubewas fed directly to a digital pulse processing system. 展开更多
关键词 1 2 FASTER eliminated
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Eliminating H_(2)O/HF and regulating interphase with bifunctional tolylene-2,4-diisocyanate(TDI)additive for long life Li-ion battery
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作者 Xueyi Zeng Xiang Gao +8 位作者 Peiqi Zhou Haijia Li Xin He Weizhen Fan Chaojun Fan Tianxiang Yang Zhen Ma Xiaoyang Zhao Junmin Nan 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第8期519-528,I0011,共11页
Lithium-ion batteries(LIBs)featuring a Ni-rich cathode exhibit increased specific capacity,but the establishment of a stable interphase through the implementation of a functional electrolyte strategy remains challengi... Lithium-ion batteries(LIBs)featuring a Ni-rich cathode exhibit increased specific capacity,but the establishment of a stable interphase through the implementation of a functional electrolyte strategy remains challenging.Especially when the battery is operated under high temperature,the trace water present in the electrolyte will accelerate the hydrolysis of the electrolyte and the resulting HF will further erode the interphase.In order to enhance the long-term cycling performance of graphite/LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)LIBs,herein,Tolylene-2,4-diisocyanate(TDI)additive containing lone-pair electrons is employed to formulate a novel bifunctional electrolyte aimed at eliminating H_(2)O/HF generated at elevated temperature.After 1000 cycles at 25℃,the battery incorporating the TDI-containing electrolyte exhibits an impressive capacity retention of 94%at 1 C.In contrast,the battery utilizing the blank electrolyte has a lower capacity retention of only 78%.Furthermore,after undergoing 550 cycles at 1 C under45℃,the inclusion of TDI results in a notable enhancement of capacity,increasing it from 68%to 80%.This indicates TDI has a favorable influence on the cycling performance of LIBs,especially at elevated temperatures.The analysis of the film formation mechanism suggests that the lone pair of electrons of the isocyanate group in TDI play a crucial role in inhibiting the generation of H_(2)O and HF,which leads to the formation of a thin and dense interphase.The existence of this interphase is thought to substantially enhance the cycling performance of the LIBs.This work not only improves the performance of graphite/NCM811 batteries at room temperature and high temperature by eliminating H_(2)O/HF but also presents a novel strategy for advancing functional electrolyte development. 展开更多
关键词 Graphite/LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)battery Tolylene-2 4-diisocyanate Long-cycling performance H_(2)O/HF eliminated additive
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YKK's New DynaPel^(TM) Water-Repellant Zipper Wins Best Product in ISPO
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《China Textile》 2024年第1期36-36,共1页
The new DynaPel^(TM) zipper uses GTT EMPEL® technology to eliminate the need for a PU film Atlanta,GA (Dec 13,2023)-The ISPO Textrends judges have selected YKK’s DynaPel^(TM) water-repellent zipper as the Best P... The new DynaPel^(TM) zipper uses GTT EMPEL® technology to eliminate the need for a PU film Atlanta,GA (Dec 13,2023)-The ISPO Textrends judges have selected YKK’s DynaPel^(TM) water-repellent zipper as the Best Product in the accessories category.The competition,held twice a year in conjunction with the ISPO trade show,recognizes the most innovative performance textiles,components,and apparel. 展开更多
关键词 TEXTILES ISP eliminate
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Comment on “A novel antibiotic class targeting the lipopolysaccharide transporter”
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作者 Ruo-Yi Lv Xiao-Ye Liu 《Pharmacology Discovery》 2024年第2期52-53,共2页
Crisis of antibiotic resistant has become a global threat to public health in recent decades[1–4].Carbapenem antibiotics are a class of atypicalβ-lactam antibiotics with the broadest antibacterial spectrum and the s... Crisis of antibiotic resistant has become a global threat to public health in recent decades[1–4].Carbapenem antibiotics are a class of atypicalβ-lactam antibiotics with the broadest antibacterial spectrum and the strongest antibacterial activity.However,carbapenem-resistant Acinetobacter baumannii(CRAB)is stilly emerging,which is a gram-negative bacterium with lipopolysaccharide(LPS),which makes it resistant to several antibiotics and thus difficult to eliminate[5,6].As the number one pathogen of nosocomial infection,CRAB can cause severe pneumonia and bloodstream infection,etc.The mortality rate of patients infected with invasive CRAB can be as high as 40%to 60%,and it has been listed as the key pathogen of Class 1 by the World Health Organization.Due to the lack of feasible antibiotic strategies,phage combination therapy has been used in some patients,while the efficacy is limited[7].Therefore,new discovery and development of antibiotic that targeting CRAB is urgently demand.Fortunately,Kenneth A. 展开更多
关键词 MORTALITY LISTED eliminate
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NILIT enabling nylon recycling through products and partnership
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《China Textile》 2024年第2期29-29,共1页
Migdal Haemek,Israel,April 2,2024.NILIT,the global market leader,and a producer of high quality Nylon 6.6 for apparel and owner of the SENSIL?brand,introduces SENSIL?Flow,a new approach to Nylon 6.6 circularity that e... Migdal Haemek,Israel,April 2,2024.NILIT,the global market leader,and a producer of high quality Nylon 6.6 for apparel and owner of the SENSIL?brand,introduces SENSIL?Flow,a new approach to Nylon 6.6 circularity that enables yarn,fabric,and,ultimately,apparel recycling to eliminate waste and further reduce apparel’s environmental impact.SENSIL?Flow is more than just a sustainable performance product.It is an innovative approach that engages the entire supply chain to truly attain circularity through product design and partnership. 展开更多
关键词 NYLON Israel eliminate
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西藏交通警察道路执法工作的风险与防范
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作者 尼桑拉 《时代汽车》 2024年第12期184-186,共3页
西藏自治区自然、地理与气候环境复杂且特殊,道路交通环境相对恶劣,这导致当地交通警察道路执法工作面临诸多风险,包括警员人身安全和执法效能等风险。对此,文章对西藏交通警察道路执法工作风险进行了调查分析,从地区环境、警员安全意... 西藏自治区自然、地理与气候环境复杂且特殊,道路交通环境相对恶劣,这导致当地交通警察道路执法工作面临诸多风险,包括警员人身安全和执法效能等风险。对此,文章对西藏交通警察道路执法工作风险进行了调查分析,从地区环境、警员安全意识与技能、执法装备、社会宣传和教育等角度探讨了相关风险的成因,针对性相关风险成因,提出从优化警力配置与道路信息推送、加强警员培训、完善警务装备、加强法治化宣传教育等工作来消除相关风险,以期保障警员安全并改善西藏交通环境。 展开更多
关键词 西藏 道路执法 信息推送 警用装备 法治化 harsh which leads to the local traffic POLICE road LAW ENFORCEMENT work to face a lot of RISKS including the personal SAFETY of the POLICE officers and LAW ENFORCEMENT effectiveness and other risks. In this regard this paper investigates and analyzes the RISKS of road LAW ENFORCEMENT work of the Xi Zang traffic POLICE discusses the causes of the RISKS from the perspectives of regional environment POLICE SAFETY awareness and skills LAW ENFORCEMENT equipment social publicity and education and proposes to eliminate the RISKS by optimizing the allocation of POLICE force and road information delivery strengthening POLICE training improving POLICE equipment and strengthening the rule of LAW publicity and education etc. so as to guarantee the SAFETY of POLICE officers and improve the effectiveness of LAW ENFORCEMENT so as to ensure the SAFETY of POLICE officers and improve the traffic environment in Xi Zang.
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A shadow- eliminated vegetation index (SEVI) for removal of self and cast shadow effects on vegetation in rugged terrains 被引量:7
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作者 Hong Jiang Sen Wang +3 位作者 Xiaojie Cao Chenghai Yang Zhaoming Zhang Xiaoqin Wang 《International Journal of Digital Earth》 SCIE EI 2019年第9期1013-1029,共17页
The effect of terrain shadow, including the self and cast shadows, is one ofthe main obstacles for accurate retrieval of vegetation parameters byremote sensing in rugged terrains. A shadow- eliminated vegetation index... The effect of terrain shadow, including the self and cast shadows, is one ofthe main obstacles for accurate retrieval of vegetation parameters byremote sensing in rugged terrains. A shadow- eliminated vegetation index(SEVI) was developed, which was computed from only red and nearinfrared top-of-atmosphere reflectance without other heterogeneous dataand topographic correction. After introduction of the conceptual modeland feature analysis of conventional wavebands, the SEVI was constructedby ratio vegetation index (RVI), shadow vegetation index (SVI) andadjustment factor (f (Δ)). Then three methods were used to validate theSEVI accuracy in elimination of terrain shadow effects, including relativeerror analysis, correlation analysis between the cosine of solar incidenceangle (cosi) and vegetation indices, and comparison analysis between SEVIand conventional vegetation indices with topographic correction. Thevalidation results based on 532 samples showed that the SEVI relativeerrors for self and cast shadows were 4.32% and 1.51% respectively. Thecoefficient of determination between cosi and SEVI was only 0.032 and thecoefficient of variation (std/mean) for SEVI was 12.59%. The results indicatethat the proposed SEVI effectively eliminated the effect of terrain shadowsand achieved similar or better results than conventional vegetation indiceswith topographic correction. 展开更多
关键词 Vegetation indices shadoweliminated vegetation index(SEVI) terrain shadow effect self shadow cast shadow
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