发布求助
文献互助 智能选刊 最新文献

2018 Baltic URSI Symposium (URSI)最新文献

筛选
英文 中文
Performance of subcarrier intensity modulation over imprecise Gamma-Gamma fading links 不精确伽玛衰落链路上的子载波强度调制性能
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-15 DOI: 10.23919/URSI.2018.8406727
Abdulgani A. Ibrahim, P. Remlein, T. Gucluoglu
{"title":"Performance of subcarrier intensity modulation over imprecise Gamma-Gamma fading links","authors":"Abdulgani A. Ibrahim, P. Remlein, T. Gucluoglu","doi":"10.23919/URSI.2018.8406727","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406727","url":null,"abstract":"Free-space optical (FSO) communication is becoming more popular as it can achieve high data rates. Gamma-Gamma turbulence channel is generally considered as a perfect channel of the FSO link, while the imprecise channel is modelled as a superposition of the perfect channel and a Gaussian random variable. We present bit error rate performance of subcarrier intensity modulated signal transmission over FSO communication systems with an imprecise channel.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134069475","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
The impact of LOS component on information disclosed to eavesdroppers in wireless channels with PHY-based secret key generation 基于物理密钥生成的无线信道中LOS组件对泄露给窃听者的信息的影响
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-15 DOI: 10.23919/URSI.2018.8406707
Michal Pilc, P. Remlein
{"title":"The impact of LOS component on information disclosed to eavesdroppers in wireless channels with PHY-based secret key generation","authors":"Michal Pilc, P. Remlein","doi":"10.23919/URSI.2018.8406707","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406707","url":null,"abstract":"Extracting information-theoretically secret keys from random fluctuations of wireless channels is a promising technology for protecting data in future radio systems like IoT, SCADA and 5G. However, the presence of Line-of-Sight (LoS) component can drastically degrade the key rate between legitimate parties. Moreover, knowledge of antenna location brings additional information to eavesdroppers about the radio channel. In the following paper we quantify this information and try to evaluate how it affects secret key capacity. Finally, we postulate randomizing the LOS channel, which will increase eavesdropper's equivocation.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127922974","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
Time-domain stochastic electromagnetic field propagator based on Jefimenko's equations 基于Jefimenko方程的时域随机电磁场传播器
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-15 DOI: 10.23919/URSI.2018.8406708
Y. Kuznetsov, A. Baev, M. Konovalyuk, A. Gorbunova, J. Russer, M. Haider
{"title":"Time-domain stochastic electromagnetic field propagator based on Jefimenko's equations","authors":"Y. Kuznetsov, A. Baev, M. Konovalyuk, A. Gorbunova, J. Russer, M. Haider","doi":"10.23919/URSI.2018.8406708","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406708","url":null,"abstract":"In this paper the analytical time-domain propagator based on Jefimenko's equations was applied to the evaluation of the stochastic electromagnetic field characteristics. It is shown that near-field spatial distribution of the cross-correlation function (CCF) obtained by two-point time-domain measurement system can be efficiently used for the prediction of the far-field distribution of the statistical characteristics for printed circuit board (PCB) radiated emission. The proposed approach has been validated by the far-field antenna measurements.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133091579","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: 10
Stratospheric VLF vertical electric mono-and dipole antenna tests in 2014–2015 2014-2015年平流层VLF垂直电单极和偶极天线试验
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-15 DOI: 10.23919/URSI.2018.8406693
T. Miś, J. Modelski
{"title":"Stratospheric VLF vertical electric mono-and dipole antenna tests in 2014–2015","authors":"T. Miś, J. Modelski","doi":"10.23919/URSI.2018.8406693","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406693","url":null,"abstract":"This paper presents the assumptions, executions and results of the three tests of vertical electric mono-and dipole antennas in the Earth's stratosphere, flown using helium balloons to the altitudes between 23 and 30 km in 2014 and 2015. The antennas varied in lengths and presented different technical aspects subjected to the tests (the corona protection, flight mechanics of extremely long flying objects, end weight for stabilizing the flight during the descent phase etc.). All aerials were safely retrieved after the landings. The data gathered during these missions helped to evaluate the basic concept of an airborne vertical electric aerial for Very Low Frequency range; it showed that very long aerials may induce electric charge flow when passing through the cloud layer, need additional weight at their ends to assure safe descent and, when composed of a tape-like structure, automatically move in a helical way, which, with a sufficient antenna length, may in the future enable the design of an elliptically-polarized vertical VLF antenna. The outcomes of the experiments shall be used in the design of a stratospheric VLF transmitter.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"39 13","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131500289","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: 6
Effect of 50 Hz electromagnetic field generated nearby high voltage alternating current transmission lines on prooxidant antioxidant balance in selected internal organs of rats 高压交流输电线路附近产生的50hz电磁场对大鼠选定脏器促氧化抗氧化平衡的影响
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-15 DOI: 10.23919/URSI.2018.8406690
P. Sowa, G. Cieślar, A. Sieroń, Karolina Sieroń
{"title":"Effect of 50 Hz electromagnetic field generated nearby high voltage alternating current transmission lines on prooxidant antioxidant balance in selected internal organs of rats","authors":"P. Sowa, G. Cieślar, A. Sieroń, Karolina Sieroń","doi":"10.23919/URSI.2018.8406690","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406690","url":null,"abstract":"The impact of whole-body exposure to 50 Hz electromagnetic field generated nearby High Voltage Alternating Current transmission lines on prooxidant antioxidant balance in selected internal organs of male rats was estimated, by means of analysis of the contents of markers of membrane lipid peroxidation and oxidative stress: malone dialdehyde (MDA) and total oxidant capacity (TOC), respectively, as well as the activity of antioxidant enzymes: superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione reductase (GR) and glutathione S-transferase (GST), in homogenates of kidney, heart and lung tissue. It was found, that 4-week lasting exposure of rats to electromagnetic field with physical parameters generated by high voltage alternating current transmission lines causes a slight intensification of oxidant processes in the tissues of examined internal organs with accompanying compensatory, multidirectional changes of antioxidant enzymes activity, enabling the maintenance of prooxidant antioxidant balance only in heart tissue.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127621942","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
Highly effective MEMS gas ionizer — A significant step of development of integrated ion-mass spectrometer 高效MEMS气体电离器——集成离子质谱仪发展的重要一步
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-15 DOI: 10.23919/URSI.2018.8406747
P. Szyszka, T. Grzebyk, A. Gorecka-Drzazga, J. Dziuban
{"title":"Highly effective MEMS gas ionizer — A significant step of development of integrated ion-mass spectrometer","authors":"P. Szyszka, T. Grzebyk, A. Gorecka-Drzazga, J. Dziuban","doi":"10.23919/URSI.2018.8406747","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406747","url":null,"abstract":"This paper presents the highly effective MEMS gas ionizer. Using electron-impact ionization, we show yield up to 10%, generated ion current is at the range of 1 to 100 nA. The highest ionization yields are reached when field-emitted electrons are trapped in Penning-like electron trap, which increases impact possibility.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126458761","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
Hybrid model of radio channels occupancy prediction for dynamic spectrum access 动态频谱接入无线信道占用预测的混合模型
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-15 DOI: 10.23919/URSI.2018.8406694
J. Łopatka, Krzysztof Malon, Michal Kryk
{"title":"Hybrid model of radio channels occupancy prediction for dynamic spectrum access","authors":"J. Łopatka, Krzysztof Malon, Michal Kryk","doi":"10.23919/URSI.2018.8406694","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406694","url":null,"abstract":"Electromagnetic environment resources are limited, but are utilized more than ever due to the increasing number of users and required bandwidth, but the current process of assigning exclusive users to specific frequency channels is very inefficient. Various methods are considered to improve spectrum utilization, including spectrum sharing models. Spectrum agile systems can search for unused channels and transmit in ‘spectrum white spaces’, without disturbing licensed users. One of the most important issues is to ensure optimal selection of white spaces, which contain sufficient resources for signal transmission with maximum probability. To improve and optimize the white space searching algorithm, a hybrid model of the channel occupancy prediction is proposed.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129320470","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: 4
Diffraction by an arbitrary-angled coated wedge: An alternative uniform asymptotic solution 任意角度包覆楔的衍射:一种可选的均匀渐近解
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-15 DOI: 10.23919/URSI.2018.8406695
G. Gennarelli, G. Riccio
{"title":"Diffraction by an arbitrary-angled coated wedge: An alternative uniform asymptotic solution","authors":"G. Gennarelli, G. Riccio","doi":"10.23919/URSI.2018.8406695","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406695","url":null,"abstract":"A uniform plane wave impacting a coated perfectly conducting wedge with arbitrary apex angle is studied and an alternative solution to the diffraction problem is presented. The coating is made of a lossy dielectric material. The approach uses the physical optics approximation of the electric and magnetic equivalent surface currents placed on the coated wedge and accounts for the oblique incidence with respect to the edge. Useful approximations, analytical integral representations and evaluations allow one to obtain a uniform asymptotic solution of the diffraction matrix. The corresponding diffracted field is approximate, but it allows one to compensate the geometrical optics field discontinuities. Moreover, it is very easy to handle and to implement in computer codes.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129427938","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: 2
Low noise radio receivers on Torun 32m antenna 托伦32米天线上的低噪声无线电接收机
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-01 DOI: 10.23919/URSI.2018.8406773
E. Pazderski
{"title":"Low noise radio receivers on Torun 32m antenna","authors":"E. Pazderski","doi":"10.23919/URSI.2018.8406773","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406773","url":null,"abstract":"Obliged to keep the attractiveness of the radio telescope to it's users, one need to improve the sensitivity of receivers all possible ways. Reducing receiver noise by applying newest low noise amplifiers, reducing ambient temperature of the cryogenic amplifiers by improving isolation in the dewar, using wider frequency bands, using high dynamic range intermediate frequency amplifiers and other means for frequency bands full of annoying interferences — all these treatments belong to the art of making the best receivers. Radio receivers need to be ready to be used with many back-ends, like VLBI terminals, spectrometers, pulsar machine, polarimeters, so they need to have many additional functionalities built-in, like switchable stable noise sources, phase calibration sources, switchable 0/180 degrees local oscillator signals and more. Review of the Torun 32 m antenna receivers will discuss the above goals in detail.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115171954","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
Transmission electron microscope on-the-chip — A reality or mystification? 芯片上的透射电子显微镜——现实还是神秘?
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-01 DOI: 10.23919/URSI.2018.8406749
M. Krysztof, T. Grzebyk, A. Gorecka-Drzazga, J. Dziuban
{"title":"Transmission electron microscope on-the-chip — A reality or mystification?","authors":"M. Krysztof, T. Grzebyk, A. Gorecka-Drzazga, J. Dziuban","doi":"10.23919/URSI.2018.8406749","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406749","url":null,"abstract":"In this article, a concept of the fully, on-a-chip, integrated MEMS electron microscope and high vacuum MEMS micropump is discussed. The device is formed as a multilayer sandwich of anodically bonded glass/silicon part. The “active” part contains field emitting CNT electron source with proper configuration of electrodes forming an electron beam. Electron beam hits a thin membrane, passes through the sample, and generates a signal on a detector placed outside a high vacuum region. Research on particular elements of the concept was done. The preliminary results are presented and future research is discussed.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"11 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128226867","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信