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Secular simulation for dynamics of charged particles in the vortex electromagnetic wave beam

Secular simulation for dynamics of charged particles in the ...

International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)

作者： Qiang Chen Boao Xu Yun Yi Xiao Cai Yuan Yuan Luoyang Electronic Equipment Testing Center Luoyang People's Republic of China National Key Laboratory of Electromagnetic Environment and Electro-optical Engineering PLA University of Science and Technology Nanjing People's Republic of China

ISBN: (纸本)9781467387637

Secular dynamics of charged particles in the vortex electromagnetic wave beam is widely used in many ranges. However, the conventional numerical schemes for this problem are failed when the charged particle velocities reach up to relativistic region. The coherent accumulation of numerical errors may destroy the simulation and introduce pseudo physics. To obtain an applicable numerical tool for secular dynamics of relativistic charged particles, R. L. Zhang et. al developed a volume-preserving algorithm (VPA) which has been successfully used in the magnetic confinement fusion research. In this work, we introduce the VPA to simulate the dynamics of charged particles in the vortex electromagnetic wave beam. A test particle model for electron in the classic Laguerre-Gaussian beam is constructed and a class of simulations is implemented. The electron evolution in the phase space is obtained which shows the orbital angular momentum effect of vortex electromagnetic wave beam. This type of simulation may lead to discovery of new physics in relevant fields.

关键词： Particle beams Electromagnetic scattering Laser beams Trajectory Heuristic algorithms Photonics

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Distribution characteristics and indicator significance of Dechloranes in multi-matrices at Ny-lesund in the Arctic

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Journal of environmental sciences 2015年第2期27卷 8-13页

作者： Guangshui Na Wei Wei Shiyao Zhou Hui Gao Xindong Ma Lina Qiu Linke Ge Chenguang Bao Ziwei Yao Key Laboratory for Ecological Environment in Coastal Areas National Marine Environmental Monitoring Center Research Center for Eco-environmental Sciences Chinese Academy of Sciences School of Chemistry and Chemical Engineering Liaoning Normal University Dalian Institute of Science & Technology School of Biological Technology Dalian Polytechnic University

In recent years, Dechloranes have been widely detected in the environment around the ***, understanding and knowledge of Dechloranes in remote regions, such as the Arctic,remain lacking. Therefore, the concentrations of 5 Dechloranes in surface seawater, sediment,soil, moss, and dung collected from Ny-lesund in the Arctic were measured with the concentrations 93 pg/L, 342, 325, 1.4, and 258 pg/g, respectively, which were much lower than those in Asian and European regions. The mean ratios of anti-Dechlorane Plus（DP） to total DP（fanti） in seawater, sediment, soil, moss, dung, and atmospheric samples were 0.36, 0.21, 0.18,0.27, 0.66, and 0.43, respectively. Results suggested that the main source of DP in seawater,sediment, soil, and moss was long-range atmospheric transport. However, the ratio identified in dung was different, for which the migration behavior of the organism is probably the main source of DP.

关键词： Dechloranes Arctic Multi-matrices Distribution characteristic Ratio Source analysis

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Effects of Red and Blue Mixed Light-Emitting Diodes(LED) and High-Pressure Sodium Lamp(HPS) on the Growth and Flowering of Forced Paeonia lactiflora

Effects of Red and Blue Mixed Light-Emitting Diodes(LED) and...

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XII International Symposium on Flower Bulbs and Herbaceous Perennials

作者： Wu Y Han J Jia M X Liu Y College of Landscape Architecture Beijing Forestry University Beijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding National Engineering Research Centre for Floriculture Beijing of Urban and Rural Ecological Environment School of Transportation and Environmental Science Shenzhen Institute of Information Technology

To determine the suitable supplemental light and corresponding light intensities for the greenhouse cultivation of forced Paeonia lactiflora,Paeonia lactiflora‘Da Fu Gui’（DFG）was exposed to 190-230μmol·m·s HPS and two red and blue mixed light-emitting diodes（LED）light intensities:400-450μmol·m·s（LED1）and 190-230μmol·m·s（LED2）;illumination began at the

关键词： flowering growth herbaceous peony LED supplemental light

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Fungal diversity notes 491–602: taxonomic and phylogenetic contributions to fungal taxa

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Fungal Diversity 2017年第2期83卷 1-261页

作者： Saowaluck Tibpromma Kevin D.Hyde Rajesh Jeewon Sajeewa S.N.Maharachchikumbura Jian-Kui Liu D.Jayarama Bhat E.B.Gareth Jones Eric H.C.McKenzie Erio Camporesi Timur S.Bulgakov Mingkwan Doilom AndreLuiz Cabral Monteiro de Azevedo Santiago Kanad Das Patinjareveettil Manimohan Tatiana B.Gibertoni Young Woon Lim Anusha Hasini Ekanayaka Benjarong Thongbai Hyang Burm Lee Jun-Bo Yang Paul M.Kirk Phongeun Sysouphanthong Sanjay K.Singh Saranyaphat Boonmee Wei Dong K.N.Anil Raj K.P.Deepna Latha Rungtiwa Phookamsak Chayanard Phukhamsakda Sirinapa Konta Subashini C.Jayasiri Chada Norphanphoun Danushka S.Tennakoon Junfu Li Monika C.Dayarathne Rekhani H.Perera Yuanpin Xiao Dhanushka N.Wanasinghe Indunil C.Senanayake Ishani D.Goonasekara N.Ide Silva Ausana Mapook Ruvishika S.Jayawardena Asha J.Dissanayake Ishara S.Manawasinghe K.W.Thilini Chethana Zong-Long Luo Kalani Kanchana Hapuarachchi Abhishek Baghela Adriene Mayra Soares Alfredo Vizzini Angelina Meiras-Ottoni Armin Mesic Arun Kumar Dutta Carlos Alberto Fragoso de Souza Christian Richter Chuan-Gen Lin Debasis Chakrabarty Dinushani A.Daranagama Diogo Xavier Lima Dyutiparna Chakraborty Enrico Ercole Fang Wu Giampaolo Simonini Gianrico Vasquez Gladstone Alves da Silva Helio Longoni Plautz Jr Hiran A.Ariyawansa Hyun Lee Ivana Kusan Jie Song Jingzu Sun Joydeep Karmakar Kaifeng Hu Kamal C.Semwal Kasun M.Thambugala Kerstin Voigt Krishnendu Acharya Kunhiraman C.Rajeshkumar Leif Ryvarden Margita Jadan MdIqbal Hosen Michal Miksık Milan C.Samarakoon Nalin N.Wijayawardene Nam Kyu Kim Neven Matocec Paras Nath Singh Qing Tian R.P.Bhatt Rafael JoseVilela de Oliveira Rodham E.Tulloss S.Aamir Saithong Kaewchai Sayali D.Marathe Sehroon Khan Sinang Hongsanan Sinchan Adhikari Tahir Mehmood Tapas Kumar Bandyopadhyay Tatyana YuSvetasheva Thi Thuong Thuong Nguyen Vladimır Antonın Wen-Jing Li Yong Wang Yuvraj Indoliya Zdenko Tkalcec Abdallah M.Elgorban Ali H.Bahkali Alvin M.C.Tang Hong-Yan Su Huang Zhang Itthayakorn Promputtha Jennifer Luangsa-ard Jianchu Xu Jiye Yan Kang Ji-Chuan Marc Stadler Pete Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of ScienceKunming 650201YunnanPeople’s Republic of China Center of Excellence in Fungal Research Mae Fah Luang UniversityChiang Rai 57100Thailand School of Science Mae Fah Luang UniversityChiang Rai 57100Thailand World Agroforestry Centre East and Central AsiaKunming 650201YunnanPeople’s Republic of China Mushroom Research Foundation 128 M.3 Ban Pa Deng T.Pa PaeA.Mae TaengChiang Mai 50150Thailand A.M.B.Gruppo Micologico Forlivese“Antonio Cicognani” Via Roma 18Forlı`Italy A.M.B.Circolo Micologico“Giovanni Carini” C.P.314BresciaItaly Societa`per gli Studi Naturalistici della Romagna C.P.144BagnacavalloRAItaly Formerly Department of Botany Goa UniversityTaleigaoGoaIndia No.128/1-J Azad Housing SocietyCurcaGoa VelhaIndia 33 B St.Edwards Road Southsea Hants Hampshire PO53DHUK Landcare Research Manaaki Whenua Private Bag 92170AucklandNew Zealand Department of Biology Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand Division of Applied Science College of International EducationThe Hong Kong Baptist UniversityHong Kong SARChina PostGraduate Program in Biology of Fungi Department of MycologyFederal University of PernambucoAv.Nelson Chavess/nRecifePE 50670-420Brazil Institute of Plant and Environment Protection Beijing Academy of Agriculture and Forestry SciencesBeijing 100097People’s Republic of China Environmental Microbiology Lab Division of Food TechnologyBiotechnology&AgrochemistryCollege of Agriculture and Life SciencesChonnam National UniversityYongbong-Dong 300Buk-GuGwangju 61186Korea Guizhou Key Laboratory of Agricultural Biotechnology Guizhou Academy of Agricultural SciencesGuiyang 550006GuizhouPeople’s Republic of China College of Agriculture and Biological Sciences Dali UniversityDali 671003YunnanPeople’s Republic of China Yunnan Institute of Food Safety Kunming University of Science&TechnologyKunming 650500YunnanPeople’s Republic

This is a continuity of a series of taxonomic and phylogenetic papers on the fungi where materials were collected from many countries,examined and *** addition to extensive morphological descriptions and appropriate asexual and sexual connections,DNA sequence data are also analysed from concatenated datasets to infer phylogenetic relationships and substantiate systematic positions of taxa within appropriate ***ever new species or combinations are proposed,we apply an integrative approach using morphological and molecular data as well as ecological features wherever *** on 112 fungal taxa are compiled in this paper including Biatriosporaceae and Roussoellaceae,Didysimulans ***.,81 new species,18 new host records and new country records,five reference specimens,two new combinations,and three sexual and asexual morph *** new species are Amanita cornelii,***,Angustimassarina alni,***,***,***,***,Ascochyta italica,***,Austroboletus appendiculatus,Barriopsis thailandica,Berkleasmium ariense,Calophoma petasitis,Camarosporium laburnicola,***,***,***,***,Colletotrichum sambucicola,Coprinopsis cerkezii,Cytospora gelida,Dacrymyces chiangraiensis,Didysimulans italica,***,Entodesmium italica,Entoloma magnum,Evlachovaea indica,Exophiala italica,Favolus gracilisporus,Femsjonia monospora,Fomitopsis flabellata,***,Gongronella brasiliensis,Helvella crispoides,Hermatomyces chiangmaiensis,***nae,Hysterium centramurum,Inflatispora caryotae,Inocybe brunneosquamulosa,***,***,Keissleriella cirsii,Lepiota cylindrocystidia,***,***,Lophiotrema guttulata,Marasmius luculentus,Morenoina calamicola,Moelleriella thanathonensis,Mucor stercorarius,Myrmecridium fluviae,Myrothecium septentrionale,Neosetophoma garethjonesii,Nigrograna cangshanensis,Nodulosphaeria guttulatum,***tata,***,Panus subf

关键词： Agaricomycetes Ascomycota Basidiomycota Dacrymycetes Dothideomycetes Eurotiomycetes New combination Mucoromycotina New genus New records New species Pezizomycetes Phylogeny Sordariomycetes Taxonomy

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First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole

arXiv

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arXiv 2019年

作者： Akiyama, Kazunori Alberdi, Antxon Alef, Walter Asada, Keiichi Azulay, Rebecca Baczko, Anne-Kathrin Ball, David Baloković, Mislav Barrett, John Bintley, Dan Blackburn, Lindy Boland, Wilfred Bouman, Katherine L. Bower, Geoffrey C. Bremer, Michael Brinkerink, Christiaan D. Brissenden, Roger Britzen, Silke Broderick, Avery E. Broguiere, Dominique Bronzwaer, Thomas Byun, Do-Young Carlstrom, John E. Chael, Andrew Chan, Chi-kwan Chatterjee, Shami Chatterjee, Koushik Chen, Ming-Tang Chen, Yongjun Cho, Ilje Christian, Pierre Conway, John E. Cordes, James M. Crew, Geoffrey B. Cui, Yuzhu Davelaar, Jordy de Laurentis, Mariafelicia Deane, Roger Dempsey, Jessica Desvignes, Gregory Dexter, Jason Doeleman, Sheperd S. Eatough, Ralph P. Falcke, Heino Fish, Vincent L. Fomalont, Ed Fraga-Encinas, Raquel Freeman, William T. Friberg, Per Fromm, Christian M. Gómez, José L. Galison, Peter Gammie, Charles F. García, Roberto Gentaz, Olivier Georgiev, Boris Goddi, Ciriaco Gold, Roman Gu, Minfeng Gurwell, Mark Hada, Kazuhiro Hecht, Michael H. Hesper, Ronald Ho, Luis C. Ho, Paul Honma, Mareki Huang, Chih-Wei L. Huang, Lei Hughes, David H. Ikeda, Shiro Inoue, Makoto Issaoun, Sara James, David J. Jannuzi, Buell T. Janssen, Michael Jeter, Britton Jiang, Wu Johnson, Michael D. Jorstad, Svetlana Jung, Taehyun Karami, Mansour Karuppusamy, Ramesh Kawashima, Tomohisa Keating, Garrett K. Kettenis, Mark Kim, Jae-Young Kim, Junhan Kim, Jongsoo Kino, Motoki Koay, Jun Yi Koch, Patrick M. Koyama, Shoko Kramer, Michael Kramer, Carsten Krichbaum, Thomas P. Kuo, Cheng-Yu Lauer, Tod R. Lee, Sang-Sung Li, Yan-Rong Li, Zhiyuan Lindqvist, Michael Liu, Kuo Liuzzo, Elisabetta Lo, Wen-Ping Lobanov, Andrei P. Loinard, Laurent Lonsdale, Colin Lu, Ru-Sen MacDonald, Nicholas R. Mao, Jirong Markoff, Sera Marrone, Daniel P. Marscher, Alan P. Martí-Vidal, Iván Matthews, Lynn D. Medeiros, Lia Matsushita, Satoki Menten, Karl M. Mizuno, Yosuke Mizuno, Izumi Moran, James M. Moriyama, Kotaro Moscibrodzka, Monika Müller, Cornelia Nagai, Hiroshi Nagar, Neil M. Nakamura, Masanori National Radio Astronomy Observatory 520 Edgemont Rd CharlottesvilleVA22903 United States Massachusetts Institute of Technology Haystack Observatory 99 Millstone Road WestfordMA01886 United States National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Black Hole Initiative at Harvard University 20 Garden Street CambridgeMA02138 United States Instituto de Astrofísica de Andalucía–CSIC Glorieta de la Astronomía s/n GranadaE-18008 Spain Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany Institute of Astronomy and Astrophysics Academia Sinica 11F of Astronomy-Mathematics Building AS/NTU No. 1 Sec. 4 Roosevelt Rd Taipei10617 Taiwan Departament d’Astronomia i Astrofísica Universitat de València C. Dr. Moliner 50 Burjassot ValènciaE-46100 Spain Observatori Astronòmic Universitat de València C. Catedrático José Beltrán 2 PaternaValènciaE-46980 Spain Steward Observatory and Department of Astronomy University of Arizona 933 N. Cherry Ave. TucsonAZ85721 United States Center for Astrophysics Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States East Asian Observatory 660 N. A’ohoku Pl. HiloHI96720 United States PO Box 9513 Leiden2300 RA Netherlands California Institute of Technology 1200 East California Boulevard PasadenaCA91125 United States Institute of Astronomy and Astrophysics Academia Sinica 645 N. A’ohoku Place HiloHI96720 United States Institut de Radioastronomie Millimétrique 300 rue de la Piscine Saint Martin d’HèresF-38406 France Radboud University P.O. Box 9010 Nijmegen6500 GL Netherlands Perimeter Institute for Theoretical Physics 31 Caroline Street North WaterlooONN2L 2Y5 Canada Department of Physics and Astronomy University of Waterloo 200 University Avenue West WaterlooONN2L 3G1 Canada Waterloo Centre for Astrophysics University of Waterloo WaterlooONN2L 3G1 Canada Korea Astronomy and Space Science Institute Daedeok-daero 776 Yuseon

We present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. These images show a prominent ring with a diameter of ∼40 μas, consistent with the size and shape of the lensed photon orbit encircling the "shadow" of a supermassive black hole. The ring is persistent across four observing nights and shows enhanced brightness in the south. To assess the reliability of these results, we implemented a two-stage imaging procedure. In the first stage, four teams, each blind to the others’ work, produced images of M87 using both an established method (CLEAN) and a newer technique (regularized maximum likelihood). This stage allowed us to avoid shared human bias and to assess common features among independent reconstructions. In the second stage, we reconstructed synthetic data from a large survey of imaging parameters and then compared the results with the corresponding ground truth images. This stage allowed us to select parameters objectively to use when reconstructing images of M87. Across all tests in both stages, the ring diameter and asymmetry remained stable, insensitive to the choice of imaging technique. We describe the EHT imaging procedures, the primary image features in M87, and the dependence of these features on imaging assumptions. Copyright © 2019, The Authors. All rights reserved.

关键词： Image reconstruction

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Optimization of the extraction process for flavonoids from basil(Ocimum basilicum)using response surface methodology

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Journal of Bioresources and Bioproducts 2016年第4期1卷 177-185页

作者： Lei Wu Ju-Wu Hu Wei Xiong Xiong-Hui Li Guan-Hua Wang Lin Dai Young-Soo Bae Chuan-Ling Si Wei-Cheng Hu Institute of Applied Chemistry Jiangxi Academy of SciencesNanchang 330096China Tianjin Key Laboratory of Pulp and Paper Tianjin University of Science and TechnologyTianjin 300457China Jiangsu Province Biomass Energy and Materials Laboratory Institute of Chemical Industry of Forest ProductsCAFNanjing 210042China Jiangsu Provincial Key Laboratory of Pulp and Paper Science and Technology Nanjing Forestry UniversityNanjing 210037Jiangsu ProvinceP.R.China State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China Department of Forest Biomaterials Engineering College of Forest&Environment SciencesKangwon National UniversityChuncheon 24341Republic of Korea Jiangsu Collaborative Innovation Center of Regional Modern Agriculture and Environmental protection/Jiangsu Key Laboratory for Eco-agricultural Biotechnology around Hongze Lake Huaiyin Normal UniversityHuaian 223300China

Basil(Ocimum basilicum),an edible and medicinal plant with high nutritional value and therapeutic efficacy,was used as a potential source of total flavonoids in this *** reflux extractions were performed using aqueous *** optimized extraction conditions of total flavonoids from *** were determined by Box-Behnken design with response surface *** surface plots showed that the optional four independent variables significantly influenced the extraction yield of total *** extraction parameters for the highest total flavonoids yield were optimized as:extraction temperature of 79.74℃,ethanol concentration of 77.63%,ratio of liquid to material of 29.72:1(mL/g),and extraction time of 2.06 *** average yield of total flavonoids under above optimum parameters was 42.61 mg of rutin equivalents per g of extract dry matter,which was in good agreement with the predicted value of 40.23 mg/*** optimized conditions could be useful for the extraction of flavonoids from ***.

关键词： Ocimum basilicum total flavonoids extraction optimization response surface methodology

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Physico-chemical characterization and source tracking of black carbon at a suburban site in Beijing

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Journal of environmental sciences 2015年第7期27卷 188-194页

作者： Hailin Wang Lei Nie Dan Liu Meiping Gao Minyan Wang Zhengping Hao National Urban Environmental Pollution Control Engineering Techniques Research Center Beijing Municipal Research Institute of Environmental Protection Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nan-jing University of Information Science and Technology Department of Chemical Engineering School of Chemical & Environmental Engineering China University of Mining & Technology Department of Environmental Nano-materials Research Center for Eco-Environmental Sciences Chinese Academy of Sciences

Particles from ambient air and combustion sources including vehicle emission, coal combustion and biomass burning were collected and chemically pretreated with the purpose of obtaining isolated BC（black carbon） samples. TEM（transmission electron microscopy）results indicate that BC from combustion sources shows various patterns, and airborne BC appears spherical and about 50 nm in diameter with a homogeneous surface and turbostratic structure. The BET（Barrett-Emmett-Teller） results suggest that the surface areas of these BC particles fall in the range of 3-23 m2/g, with a total pore volume of 0.03-0.05 cm3/g and a mean pore diameter of 7-53 nm. The nitrogen adsorption-desorption isotherms are indicative of the accumulation mode and uniform pore size. O2-TPO（temperature programmed oxidation）profiles suggest that the airborne BC oxidation could be classified as the oxidation of amorphous carbon, which falls in the range of 406-490℃ with peaks at 418, 423 and 475℃,respectively. Generally, the BC characteristics and source analysis suggest that airborne BC most likely comes from diesel vehicle emission at this site.

关键词： Black carbon Characterization Source emission Beijing

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The monitoring of land use and land cover change of Sichuan province and Chengdu district, China

The monitoring of land use and land cover change of Sichuan ...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Shijie Yu Zezhong Zheng Wunian Yang Mingcang Zhu Yong He Zhenlu Yu Shengli Wang Fu Wang Jiang Li School of Resources and Environment Univ. of Electronic Science and Technology of China Chengdu Sichuan PRC State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan Univ. Wuhan Hubei PRC Ministry of Land and Resources of the China Chengdu Univ. of Technology Chengdu Sichuan PRC Guangxi Key Laboratory for Spatial Information and Geomatics Guilin Guangxi PRC Land and Resources Department of Sichuan Province Chengdu Sichuan PRC Sichuan Institute of Geo-Environment Monitoring Chengdu Sichuan PRC China National Space Administration Earth Observation System and Data Center Beijing PRC CMA National Satellite Meteorological Center Beijing PRC Dep. of Electrical and Computer Engineering Old Dominion Univ. Norfolk VA USA

Land use and land cover change (LUCC) is necessary to explore the factors leading to heavy drought and rainy-flood disaster in some districts of Sichuan province. A method based RS, GIS, GPS and Google earth (GE) is presented to establish LUCC database in Sichuan province and Chengdu district. At first, LUCC is interpreted based on the new temporal images and the land use and land cover database from TM in ***, some ground objects, which could not be identified in the new temporal images, were interpreted utilizing GE with some higher spatial resolution images. Thirdly, the new interpreted LUCC was validated in the field with GPS handheld receiver. Then, LUCC of Sichuan province was updated. A comparative analysis of LUCC between in Sichuan province and in Chengdu district was conducted and the result showed: (1) a large amount of farmland in Sichuan Province was occupied from 2000 to 2005 and the area is 84 573 ha. While construction land gained obviously and the area was 35 828 ha. The dynamic degree of construction land was 111.10 0 / 00 from 2000 to 2005. The LUCC demonstrated that the economy of Sichuan province continued to develop, the cities were overspreading and the urban heat island effect was deteriorated from 2000 to 2005. (2) A large amount of farmland was also occupied in Chengdu district from 2000 to 2005, the area amounted to 12 989 ha. The farmland lost was mainly changed to construction land, amounting to 93%. And the dynamic degree was 117.41 0 / 00 from 2000 to 2005, which was bigger than that in Sichuan province.

关键词： Spatial resolution Global Positioning System Urban areas Thermal pollution Remote sensing Google Databases

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CPML and quasi-CPML for cylindrical MRTD method

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Progress In Electromagnetics Research B 2015年第1期61卷 17-30页

作者： Zhang, Pin Liu, Yawen Qiu, Shi Yang, Bo National Key Laboratory on Electromagnetic Environment and Electro-optical Engineering PLA University of Science and Technology Nanjing210007 China

Two absorbing boundary conditions (ABC's) are derived for the cylindrical MRTD grids. The first one is the convolutional perfectly matched layer (CPML) based on stretched coordinates with complex frequency shifted constitutive parameters, and the other is the straightforward extension of CPML named quasi-CPML (QCPML) as it is no longer perfectly matched for cylindrical interfaces. Unlike the Berenger's PML, the implementations of the two ABC's are completely independent of the host material. Numerical results show that both ABC's can provide a quite satisfactory absorbing boundary condition, and can save more CPU time and memory than the Berenger's PML, while the QCPML has an advantage of CPML at the proposed absorbing performance, CPU time and memory saving. Moreover, it is shown that the QCPML is more effective than the PML and CPML at absorbing evanescent waves.

关键词： Boundary conditions

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A spherical higher-order finite-difference time-domain algorithm with perfectly matched layer

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Chinese Physics B 2014年第12期23卷 166-176页

作者：刘亚文陈亦望张品刘宗信 National Key Laboratory on Electromagnetic Environment and Electro-optical Engineering PLA University of Science and Technology

A higher-order finite-difference time-domain（HO-FDTD） in the spherical coordinate is presented in this paper. The stability and dispersion properties of the proposed scheme are investigated and an air-filled spherical resonator is modeled in order to demonstrate the advantage of this scheme over the finite-difference time-domain（FDTD） and the multiresolution time-domain（MRTD） schemes with respect to memory requirements and CPU time. Moreover, the Berenger＇s perfectly matched layer（PML） is derived for the spherical HO-FDTD grids, and the numerical results validate the efficiency of the PML.

关键词： higher-order finite-difference time-domain spherical coordinates stability numerical dispersion perfectly matched layer

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