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Complex permittivity study of a Pinus Pinaster needle bed on fire 火烧松针床的复介电常数研究
URSI Radio Science Bulletin Pub Date : 2021-09-01 DOI: 10.23919/URSIRSB.2021.10292808
Mário Vala;Stefânia Faria;Nuno Leonor;João M. Felício;Carlos Fernandes;Carlos Salema;Rafael Caldeirinha
{"title":"Complex permittivity study of a Pinus Pinaster needle bed on fire","authors":"Mário Vala;Stefânia Faria;Nuno Leonor;João M. Felício;Carlos Fernandes;Carlos Salema;Rafael Caldeirinha","doi":"10.23919/URSIRSB.2021.10292808","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292808","url":null,"abstract":"In this paper, a range of complex permittivity values, estimated from a Pinus Pinaster fuel bed on fire is presented. The Fire Dynamics Simulator (FDS) was used to model the fire environment and the Cold Plasma Model (CPM) was applied to evaluate the complex permittivities of such turbulent media. The retrieved values served as input parameters describing the propagation medium, enabling a full-wave analysis based on the Finite-Difference TimeDomain (FDTD) method to evaluate and ascertain the impact of a weakly ionised plasma generated during vegetation combustion on radiowave propagation. Comparisons were obtained against two other methods, namely the Transmission-Line Method (TLM) and the Full-Stack (FS) technique, as a way to reduce the computational time. These analyses yielded attenuation values up to 6 dB for the simulated scenario, in which good agreement among techniques was obtained. Preliminary results clearly indicated that fire may degrade communications in real fire situations.","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"14-21"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292808.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68078000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
In memoriam: W. Ross Stone 26 August 1947 – 29 March 2023 纪念：W.Ross Stone 1947年8月26日至2023年3月29日
URSI Radio Science Bulletin Pub Date : 2021-09-01 DOI: 10.23919/URSIRSB.2021.10292764
{"title":"In memoriam: W. Ross Stone 26 August 1947 – 29 March 2023","authors":"","doi":"10.23919/URSIRSB.2021.10292764","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292764","url":null,"abstract":"It is with great sadness that we inform all radio scientists of the passing of Ross Stone, Editor of the URSI Radio Science Bulletin. Ross was born in San Diego, California, USA on August 26, 1947. He grew up and went to school in San Diego, where he received his BA in geophysics in 1967 at the age of 19, and his M.Sc. and Ph.D. degrees in applied physics in 1973 and 1978, all from the University of California, San Diego. He died in San Diego on March 29, 2023, after a long illness.","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"11-11"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292764.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68078002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Information for authors 作者信息
URSI Radio Science Bulletin Pub Date : 2021-09-01 DOI: 10.23919/URSIRSB.2021.10292828
{"title":"Information for authors","authors":"","doi":"10.23919/URSIRSB.2021.10292828","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292828","url":null,"abstract":"","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"101-101"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292828.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68078005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A simple method for calibrating GPS-disciplined clocks via direct comparison to a UTC(k) time scale 通过与UTC（k）时标的直接比较来校准GPS规定时钟的一种简单方法
URSI Radio Science Bulletin Pub Date : 2021-09-01 DOI: 10.23919/URSIRSB.2021.10292813
Michael A. Lombardi;Bijunath R. Patla;Andrew N. Novick;Demetrios Matsakis;Stephen J. Mitchell
{"title":"A simple method for calibrating GPS-disciplined clocks via direct comparison to a UTC(k) time scale","authors":"Michael A. Lombardi;Bijunath R. Patla;Andrew N. Novick;Demetrios Matsakis;Stephen J. Mitchell","doi":"10.23919/URSIRSB.2021.10292813","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292813","url":null,"abstract":"Global-Positioning-System-(GPS) disciplined clocks are referenced to the Coordinated Universal Time (UTC) scale at the United States Naval Observatory (USNO), known as UTC(USNO). The UTC(USNO) time scale is a very close approximation of UTC, the official world time scale. GPS-disciplined clocks therefore provide a very close approximation of UTC when they are properly calibrated to compensate for equipment and cable delays. This paper provides a simple method for calibrating GPS-disciplined clocks with respect to UTC so they can replicate UTC with uncertainties of < 10 ns. The method involves directly comparing the device under test to any UTC(k) time scale listed on the weekly Rapid UTC (UTCr) reports published by the Bureau International des Poids et Mesures (BIPM).","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"51-58"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292813.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68176324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SCOSTEP's new research program: "Predictability of variable solar-terrestrial coupling (PRESTO)" SCOSTEP的新研究项目：“可变日地耦合的可预测性（PRESTO）”
URSI Radio Science Bulletin Pub Date : 2021-09-01 DOI: 10.23919/URSIRSB.2021.10292815
J. L. Chau;C. J. Rodger
{"title":"SCOSTEP's new research program: \"Predictability of variable solar-terrestrial coupling (PRESTO)\"","authors":"J. L. Chau;C. J. Rodger","doi":"10.23919/URSIRSB.2021.10292815","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292815","url":null,"abstract":"The Scientific Committee on Solar Terrestrial Physics (SCOSTEP) has recently launched its latest five-year scientific program, \" Predictability of Variable Solar-Terrestrial Coupling (PRESTO).\" This program is intended to last from 2020 through 2024. URSI is one of SCOSTEP's formal participating bodies, and provides a representative to the Bureau that governs SCOSTEP. Through this route, URSI was involved in the selection of the projects that formed the PRESTO program. The scientific goals of PRESTO are relevant to a wide range of URSI members, and in particular to those from Commissions E, F, G, H, and J. In this brief article, we wish to alert the URSI community to PRESTO and its pillars.","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"62-67"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292815.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68176326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Radio science bulletin staff 无线电科学公告工作人员
URSI Radio Science Bulletin Pub Date : 2021-09-01 DOI: 10.23919/URSIRSB.2021.10292761
{"title":"Radio science bulletin staff","authors":"","doi":"10.23919/URSIRSB.2021.10292761","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292761","url":null,"abstract":"","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"3-5"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292761.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68078001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the radar cross section of dragons 关于龙的雷达截面
URSI Radio Science Bulletin Pub Date : 2021-09-01 DOI: 10.23919/URSIRSB.2021.10292814
Stefano Selleri
{"title":"On the radar cross section of dragons","authors":"Stefano Selleri","doi":"10.23919/URSIRSB.2021.10292814","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292814","url":null,"abstract":"An assessment is given of the possibility of detecting and recognizing dragons based on their radar cross section.","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"59-61"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292814.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68176327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Bayesian k-vector estimation method for electromagnetic waves in magnetized cold plasma 磁化冷等离子体中电磁波的Bayesian k矢量估计方法
URSI Radio Science Bulletin Pub Date : 2021-09-01 DOI: 10.23919/URSIRSB.2021.10292818
Yuji Tanaka;Mamoru Ota;Shoya Matsuda;Yoshiya Kasahara
{"title":"A Bayesian k-vector estimation method for electromagnetic waves in magnetized cold plasma","authors":"Yuji Tanaka;Mamoru Ota;Shoya Matsuda;Yoshiya Kasahara","doi":"10.23919/URSIRSB.2021.10292818","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292818","url":null,"abstract":"Using the plasma wave characteristics and remote sensing technology, the k-vector direction of plasma waves can provide important information for understanding the global features of space plasma. In this study, we proposed a Bayesian k-vector estimation method in magnetized cold plasma based on the wave distribution function method. The proposed method can be applied to various types of sensors with easy visualization and calculation of the estimation accuracy. We verified the effectiveness of the proposed method through simulations.","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"77-82"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292818.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68176330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Preliminary call for papers 初步文件征集
URSI Radio Science Bulletin Pub Date : 2021-06-01 DOI: 10.23919/URSIRSB.2021.9829348
{"title":"Preliminary call for papers","authors":"","doi":"10.23919/URSIRSB.2021.9829348","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.9829348","url":null,"abstract":"The XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023) is sponsored by The Institute of Electronics, Information and Communication Engineers (IEICE), the International Union of Radio Science (URSI), and the Science Council of Japan (SCJ), and will be held in Sapporo, Japan on August 19 – 26, 2023.","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 377","pages":"55-55"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/9829337/09829348.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
In memoriam: Oleg Alexandrovich Tretyakov 纪念奥列格·亚历山德罗维奇·特雷蒂亚科夫
URSI Radio Science Bulletin Pub Date : 2021-06-01 DOI: 10.23919/URSIRSB.2021.9829353
Fatih Erden
{"title":"In memoriam: Oleg Alexandrovich Tretyakov","authors":"Fatih Erden","doi":"10.23919/URSIRSB.2021.9829353","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.9829353","url":null,"abstract":"Oleg Alexandrovich Tretyakov (Figure 1), the Chair of Commission B of the URSI National Committee of Ukraine since 1993, a member of the IEEE, and Professor Emeritus of the Department of Theoretical Radiophysics, V N. Karazin Kharkiv National University (KhNU), Ukraine, passed away on January 25, 2022, in Istanbul, at the age of 83. He died shortly after he was hospitalized and diagnosed with lung cancer on December 29, 2021.","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 377","pages":"60-61"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/9829337/09829353.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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