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2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)最新文献

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A Study of the Correlation between Enhanced LHR, VLF Turbulences and Earthquakes 强LHR、VLF湍流与地震的相关性研究
2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM) Pub Date : 2021-01-04 DOI: 10.23919/USNC-URSINRSM51531.2021.9336513
A. Maxworth, M. Gołkowski, G. Perry
{"title":"A Study of the Correlation between Enhanced LHR, VLF Turbulences and Earthquakes","authors":"A. Maxworth, M. Gołkowski, G. Perry","doi":"10.23919/USNC-URSINRSM51531.2021.9336513","DOIUrl":"https://doi.org/10.23919/USNC-URSINRSM51531.2021.9336513","url":null,"abstract":"Lower Hybrid Resonance (LHR) frequency in the ionosphere is influenced by the plasma density and the temperature. Variations in the same two governing factors are indicators of earthquakes. Hence, observing the variations of LHR is important as an indirect precursor of earthquakes. At the same time some correlations were observed with the earthquakes and ionospheric Very Low Frequency (VLF) turbulences. In this work we analyze data collected by the Radio Receiver Instrument (RRI) on the enhanced Polar Outflow Probe (e-POP) for LHR and VLF turbulences and compare our records with the United States Earthquake database.","PeriodicalId":180982,"journal":{"name":"2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115757956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electrostatic Waves with Rapid Frequency Shifts in the Solar Wind from PSP observations 来自PSP观测的太阳风中快速频移的静电波
2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM) Pub Date : 2021-01-04 DOI: 10.23919/usnc-ursinrsm51531.2021.9336447
L. Kromyda, D. Malaspina, R. Ergun, J. Halekas, M. Stevens, J. Verniero, A. Chasapis, D. Vech, S. Bale, J. Bonnell, T. D. de Wit, K. Goetz, K. Goodrich, P. Harvey, R. Macdowall, M. Pulupa, A. Case, J. Kasper, K. Korreck, D. Larson, R. Livi, P. Whittlesey
{"title":"Electrostatic Waves with Rapid Frequency Shifts in the Solar Wind from PSP observations","authors":"L. Kromyda, D. Malaspina, R. Ergun, J. Halekas, M. Stevens, J. Verniero, A. Chasapis, D. Vech, S. Bale, J. Bonnell, T. D. de Wit, K. Goetz, K. Goodrich, P. Harvey, R. Macdowall, M. Pulupa, A. Case, J. Kasper, K. Korreck, D. Larson, R. Livi, P. Whittlesey","doi":"10.23919/usnc-ursinrsm51531.2021.9336447","DOIUrl":"https://doi.org/10.23919/usnc-ursinrsm51531.2021.9336447","url":null,"abstract":"During its first five orbits, the FIELDS plasma wave investigation on board Parker Solar Probe (PSP) has observed a multitude of plasma waves, including electrostatic whistler and electron Bernstein waves (Malaspina et al. 2020), sunward propagating whistlers (Agapitov et al. 2020), ion-scale electromagnetic waves (Verniero et al. 2020, Bowen et al. 2020) and Alfven, slow and fast mode waves (Chaston et al. 2020).","PeriodicalId":180982,"journal":{"name":"2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126724001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Air-core Coil Gradiometer for Biomagnetic Sensing in Non-shielded Environments 用于非屏蔽环境下生物磁传感的空芯线圈梯度仪
2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM) Pub Date : 2021-01-04 DOI: 10.23919/USNC-URSINRSM51531.2021.9336443
Keren Zhu, A. Kiourti
{"title":"Air-core Coil Gradiometer for Biomagnetic Sensing in Non-shielded Environments","authors":"Keren Zhu, A. Kiourti","doi":"10.23919/USNC-URSINRSM51531.2021.9336443","DOIUrl":"https://doi.org/10.23919/USNC-URSINRSM51531.2021.9336443","url":null,"abstract":"Magnetic fields emitted from the human body can serve as indicators of diverse health conditions. However, such fields are very small, making it hard to detect. Devices used to date for capturing these fields are bulky, expensive, and require additional equipment such as heaters, coolers, lasers, and/or shielding rooms. In this work, we report a lightweight miniature air-core coil gradiometer that is combined with advanced Digital Signal Processing (DSP) to capture biomagnetic fields in non-shielded environments. In vitro experimental results show that our gradiometer can pick up 50-Hz signals as low as 76 fT by averaging 5 min of raw data. Notably, the gradiometer's coil has an outer diameter of only 14.5 mm, height of 10 mm and weight of 1.64 g. In the future, this design can be modified to detect in vivo biomagnetic signals including: magnetomyography (MMG), magnetocardiography (MCG), magnetoencephalography (MEG), and magnetospinography (MSG).","PeriodicalId":180982,"journal":{"name":"2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128880695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Wireless Telemetry System for Long-term Real-time Subsurface Monitoring 长期实时地下监测无线遥测系统
2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM) Pub Date : 2021-01-04 DOI: 10.23919/USNC-URSINRSM51531.2021.9336487
Xiaoliang Li, Chenpei Huang, Debing Wei, M. Pan, X. Shan, Jiefu Chen
{"title":"Wireless Telemetry System for Long-term Real-time Subsurface Monitoring","authors":"Xiaoliang Li, Chenpei Huang, Debing Wei, M. Pan, X. Shan, Jiefu Chen","doi":"10.23919/USNC-URSINRSM51531.2021.9336487","DOIUrl":"https://doi.org/10.23919/USNC-URSINRSM51531.2021.9336487","url":null,"abstract":"Carbon capture and storage (CCS) is an effective technique to mitigate the global climate change by storing the CO2 underground permanently. Therefore, the techniques to monitoring the CO2 sequestration status and the potential leakage are crucial. In this paper, a novel real-time underground monitoring and wireless communication system has been developed. The system will include an array of toroidal transceivers winding around the highly conductive casing string for wireless data transfer between surface and deep subsurface, and energized casing technique is utilized to charge the toroidal transceivers and subsurface sensors. This novel wireless telemetry system will help to maintain well integrity and reduce potential leakage by eliminating the needs for perforated casing or an umbilical in the cement annulus since no direct path of fluid leakage is induced by this wireless system. The wireless signal and energy transfer rate are both enhanced significantly by the metal casing amplification. The available bandwidth and the corresponded channel capacity are calculated based on numerical simulation.","PeriodicalId":180982,"journal":{"name":"2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130618070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Wearable Loops for Unobtrusive Electromagnetic Detection of Joint Effusion 用于关节积液不显眼电磁检测的可穿戴环
2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM) Pub Date : 2021-01-04 DOI: 10.23919/USNC-URSINRSM51531.2021.9336474
Zeke Z. Dalisky, Vigyanshu Mishra, A. Kiourti
{"title":"Wearable Loops for Unobtrusive Electromagnetic Detection of Joint Effusion","authors":"Zeke Z. Dalisky, Vigyanshu Mishra, A. Kiourti","doi":"10.23919/USNC-URSINRSM51531.2021.9336474","DOIUrl":"https://doi.org/10.23919/USNC-URSINRSM51531.2021.9336474","url":null,"abstract":"Joint effusion is associated with synovial fluid build-up in or around a joint. Current state-of-the-art medical imaging methods such as X-ray, ultrasound, and Magnetic Resonance Imaging (MRI) can provide high-resolution images but are resource-intensive and limited to specialized medical facilities, preventing them from being used for long-term, continuous and real-time monitoring. In this work, we propose an alternative, wearable method for detecting joint effusion which addresses these shortcomings. The method relies on monitoring changes in the transmission coefficient (S21) between two conducting loops placed around the limb near the joint region. Using electromagnetic simulations on a simplified arm-effusion model, a clear trend is presented between the magnitude/phase of S21 and effusion radius. Particularly, for the best design, 0.5-cm variations from 1 to 3 cm in spherical effusion radius can be detected with a minimum required S21 precision of 1.02 dB for magnitude or/and 13.50° for phase. Significance of this approach lies in early stage detection and ease of treatment for such medical conditions.","PeriodicalId":180982,"journal":{"name":"2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133448427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Cyclostationarity in EMI Assessment of PCBs 多氯联苯电磁干扰评估中的循环平稳性
2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM) Pub Date : 2021-01-04 DOI: 10.23919/USNC-URSINRSM51531.2021.9336442
J. Russer, M. Haider, P. Russer, A. Baev, Y. Kuznetsov
{"title":"Cyclostationarity in EMI Assessment of PCBs","authors":"J. Russer, M. Haider, P. Russer, A. Baev, Y. Kuznetsov","doi":"10.23919/USNC-URSINRSM51531.2021.9336442","DOIUrl":"https://doi.org/10.23919/USNC-URSINRSM51531.2021.9336442","url":null,"abstract":"Printed circuit boards (PCBs) are a source of radiated electromagnetic interference (EMI). Signal data transfer occurring on digital circuits can be considered in EMI modeling as a random process with cyclostationary properties. Electromagnetic fields originating from random or quasi-random source processes with stationary Gaussian probability distribution can be characterized by field-field correlations. For cyclostationary processes, the analysis procedure needs to be extended. In this contribution, we discuss the exposure of cycostationarity in the context of near field correlation analysis.","PeriodicalId":180982,"journal":{"name":"2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133138220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A 10MHz-1GHz Mitigated Shunt Capacitance Hybrid LNA for Use in a Ka-Band Envelope Detector Baseband Output 用于ka波段包络检测器基带输出的10MHz-1GHz缓调并联电容混合LNA
2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM) Pub Date : 2021-01-04 DOI: 10.23919/USNC-URSINRSM51531.2021.9336482
N. Estes, J. Chisum
{"title":"A 10MHz-1GHz Mitigated Shunt Capacitance Hybrid LNA for Use in a Ka-Band Envelope Detector Baseband Output","authors":"N. Estes, J. Chisum","doi":"10.23919/USNC-URSINRSM51531.2021.9336482","DOIUrl":"https://doi.org/10.23919/USNC-URSINRSM51531.2021.9336482","url":null,"abstract":"A simulated hybrid LNA exhibiting over 45 dB of power gain and <2 dB noise figure from 10 MHz to 1 GHz is designed as a baseband amplification stage for a zero-bias diode envelope detector in on-off-keying systems. The high source impedance of the diode requires mitigation and compensation of parasitic shunt capacitance between the detector and first gain stage. Here, we remove the ground plane between the first transistor stage and the diode output, as well as increasing pad-to-pad and pad-to-via spacing to reduce on-PCB parasitic shunt capacitance. The transistors are low-Cgs HEMTs to further ensure low shunt-capacitance to ground. We also employ inductive peaking to compensate for the dominant pole caused by the source shunt capacitance. The amplifier is expected to dissipate 8 mW from a 0.5 V source.","PeriodicalId":180982,"journal":{"name":"2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129000019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exceptional Points of Degeneracy in a Transmission Line Periodically Loaded with Gain and Radiation Loss 周期性加载增益和辐射损耗的传输线中的异常简并点
2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM) Pub Date : 2021-01-04 DOI: 10.23919/USNC-URSINRSM51531.2021.9336503
E. Hafezi, Ahmed F. Abdelshafy, T. Mealy, A. Nikzamir, F. Capolino
{"title":"Exceptional Points of Degeneracy in a Transmission Line Periodically Loaded with Gain and Radiation Loss","authors":"E. Hafezi, Ahmed F. Abdelshafy, T. Mealy, A. Nikzamir, F. Capolino","doi":"10.23919/USNC-URSINRSM51531.2021.9336503","DOIUrl":"https://doi.org/10.23919/USNC-URSINRSM51531.2021.9336503","url":null,"abstract":"We demonstrate that a periodic transmission line consisting of uniform lossless segments together with discrete gain and radiation-loss elements supports exceptional points of degeneracy (EPDs). We provide analytical expressions for the conditions that guarantee the coalescence of eigenvalues and eigenvectors. We show the dispersion diagram and discuss the tunability of the EPD frequency. Additionally, a special case is shown where the eigenvectors coalesce for all frequencies when a specific relationship between transmission line characteristic impedance, and gain/loss elements holds; in other words, in this situation, exceptional points merge to a line of frequency. The class of EPDs proposed in this work is very promising in many of applications that incorporate radiation losses.","PeriodicalId":180982,"journal":{"name":"2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125602820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Circularly Polarized RFID Tag Antenna Design for Underground Localization System 地下定位系统的圆极化RFID标签天线设计
2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM) Pub Date : 2021-01-04 DOI: 10.23919/USNC-URSINRSM51531.2021.9336514
Yiming Chen, A. Elsherbeni
{"title":"Circularly Polarized RFID Tag Antenna Design for Underground Localization System","authors":"Yiming Chen, A. Elsherbeni","doi":"10.23919/USNC-URSINRSM51531.2021.9336514","DOIUrl":"https://doi.org/10.23919/USNC-URSINRSM51531.2021.9336514","url":null,"abstract":"A circularly polarized antenna is proposed in this paper for a Radio frequency identification tag to be used in the underground localization system. The tag supports wideband performance around 915 MHz and the fully covered metal ground makes the tag less affected by the medium it will be attached to. An extended metal plate is also discussed to improve the tag read range and to make it easier to attach on the uneven wall in underground tunnels. With the extended metal plate, the tag −10 dB reflection-coefficient bandwidth is 37 MHz (890–926 MHz) and the 3 dB AR bandwidth is 6.4 MHz (911.4-917.8 MHz). This design provides good circular polarization characteristics and a read range of 2.2 m.","PeriodicalId":180982,"journal":{"name":"2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124607388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Dynamic Mode Decomposition Reduced-Order Models for Multiscale Kinetic Plasma Analysis 多尺度动力学等离子体分析的动态模式分解降阶模型
2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM) Pub Date : 2021-01-04 DOI: 10.23919/USNC-URSINRSM51531.2021.9336498
I. Nayak, F. Teixeira
{"title":"Dynamic Mode Decomposition Reduced-Order Models for Multiscale Kinetic Plasma Analysis","authors":"I. Nayak, F. Teixeira","doi":"10.23919/USNC-URSINRSM51531.2021.9336498","DOIUrl":"https://doi.org/10.23919/USNC-URSINRSM51531.2021.9336498","url":null,"abstract":"We demonstrate the efficacy of dynamic mode decomposition (DMD) based reduced-order model (ROM) in characterizing the transient behavior of full-order kinetic plasma simulation. The full-order kinetic plasma model makes use of the finite-element time-domain (FETD) based electromagnetic particle-in-cell (EM-PIC) algorithm. We apply the suggested reduced-order method for the case of an expanding plasma ball and study the effect of DMD reconstructed self fields on the particle dynamics in transient region. Such analysis is highly desirable for understanding underlying physics of complex plasmas as well as for reducing computation cost of high-fidelity plasma simulations.","PeriodicalId":180982,"journal":{"name":"2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115136097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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