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2018 Baltic URSI Symposium (URSI)最新文献

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Integrated transceivers for WDM-PON access systems 用于WDM-PON接入系统的集成收发器
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-01 DOI: 10.23919/URSI.2018.8406763
Aleksandra Paśnikowska, S. Stopinski, K. Anders, A. Jusza, R. Piramidowicz, Marcin Tomkiewicz
{"title":"Integrated transceivers for WDM-PON access systems","authors":"Aleksandra Paśnikowska, S. Stopinski, K. Anders, A. Jusza, R. Piramidowicz, Marcin Tomkiewicz","doi":"10.23919/URSI.2018.8406763","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406763","url":null,"abstract":"We present and discuss the performance of integrated multi-channel transceivers for application in optical communication systems. The devices are realized using distributed Bragg reflector lasers, integrated with Mach-Zehnder amplitude modulators.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"1 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":"130117937","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
Observations of the interstellar scattering of pulsars with the POLFAR stations POLFAR站对脉冲星星际散射的观测
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-01 DOI: 10.23919/URSI.2018.8406733
W. Lewandowski, L. Blaszkiewicz, Bartosz Śmierciak, M. Pożoga, J. Kijak, A. Krankowski, K. Chyży, H. Rothkaehl, R. Pękal, T. Sidorowicz, M. Sendyk, M. Curyło, B. Matyjasiak
{"title":"Observations of the interstellar scattering of pulsars with the POLFAR stations","authors":"W. Lewandowski, L. Blaszkiewicz, Bartosz Śmierciak, M. Pożoga, J. Kijak, A. Krankowski, K. Chyży, H. Rothkaehl, R. Pękal, T. Sidorowicz, M. Sendyk, M. Curyło, B. Matyjasiak","doi":"10.23919/URSI.2018.8406733","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406733","url":null,"abstract":"One of the most important effects occurring during the propagation of the pulsar-emitted radio waves through the interstellar medium (ISM) is the temporal pulse broadening caused by the scattering of the signal. Our latest studies of this phenomenon, which were performed for the largest sample of pulsars used for this purpose, have shown that the amount of the observed scattering strongly depends on the observing frequency. However, the slope of the dependence is different from the theoretical predictions based on simple scattering models of the turbulent ISM. Low frequency observations are crucial for the study of the scattering phenomenon, since it is at frequencies below a few hundred megahertz where the effects of scattering are the strongest. Currently for pulsar observations we are using all three POLFAR (POlish Low Frequency ARray) stations, which are a part of the International Low Frequency Array (ILT) telescope. The wide bandwidth of the telescope's receivers allows us to study the frequency evolution of interstellar scattering with a single observation. We will present the first results of this project.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"1 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":"131291548","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
Neural network for finding mathematical formulas in videos from data science conferences 从数据科学会议视频中寻找数学公式的神经网络
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-01 DOI: 10.23919/URSI.2018.8406742
R. Załuska
{"title":"Neural network for finding mathematical formulas in videos from data science conferences","authors":"R. Załuska","doi":"10.23919/URSI.2018.8406742","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406742","url":null,"abstract":"This paper presents a novel approach to the problem of finding mathematical formulas on video frames. Distinguishing equations from other text and objects on given image involves a deeper understanding of individual symbols, patterns, and their relative positions. Standard segmentation methods used for this kind of task will fail immediately because they mostly rely on noticeable differences between color and shape of different objects. By using a fully convolutional neural network and image to image transformation, we were able to achieve state of the art results in finding mathematical formulas in movie frames extracted from data science conferences videos. Current status of the work, results and further development plans are presented.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"32 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":"116535124","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
Analysis of influence of losses in the core of the inductor on parameters of the buck converter 电感铁芯损耗对降压变换器参数的影响分析
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-01 DOI: 10.23919/URSI.2018.8406725
K. Górecki, K. Detka
{"title":"Analysis of influence of losses in the core of the inductor on parameters of the buck converter","authors":"K. Górecki, K. Detka","doi":"10.23919/URSI.2018.8406725","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406725","url":null,"abstract":"In the paper the influence of the applied model of power losses in the core of the inductor on parameters of the buck converter is analysed. The selected literature dependences describing power losses in the ferromagnetic core are presented. Equations describing values of quantities occurring in these equations for the inductor operating in the considered converter are formulated. Computer analyses illustrating the influence of frequency, converter load resistance and the applied model of losses on the power dissipated in the core of the inductor are performed. The obtained results of calculations are discussed.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"42 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":"121023955","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
Towards the new era of low-frequency astronomy: Studying the Stephan's Quintet at (really) long waves 迈向低频天文学的新时代:在(真正的)长波上研究斯蒂芬五重奏
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-01 DOI: 10.23919/URSI.2018.8406723
B. Nikiel-Wroczyński, M. Soida
{"title":"Towards the new era of low-frequency astronomy: Studying the Stephan's Quintet at (really) long waves","authors":"B. Nikiel-Wroczyński, M. Soida","doi":"10.23919/URSI.2018.8406723","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406723","url":null,"abstract":"As the resolution of a telescope is directly connected to the diameter of its aperture, and its sensitivity to extended structures — to its fulfillment — high fidelity observations of not-so-angularly-big galaxies, and their low-quantity systems at low frequencies were considered difficult for a long time. Thanks to the introduction of metrewave-oriented instruments, like large systems of mesh antennas, or phased dipole arrays, such observations are becoming possible, and numerous scientific projects make now use of instruments like the LOw Frequency ARray (LOFAR), Giant Metrewave Radio Telescope (GMRT), or the Murchison Widefield Array (MWA). Here I present preliminary results obtained for a small galaxy group, the Stephan's Quintet, with the GMRT and LOFAR.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"2 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":"123971968","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
Phased antenna array reconstructive diagnostics using small number of measurements 使用少量测量的相控阵天线重构诊断
2018 Baltic URSI Symposium (URSI) Pub Date : 2018-05-01 DOI: 10.23919/URSI.2018.8406700
G. Kuznetsov, V. Temchenko, D. Voskresenskiy, M. Miloserdov
{"title":"Phased antenna array reconstructive diagnostics using small number of measurements","authors":"G. Kuznetsov, V. Temchenko, D. Voskresenskiy, M. Miloserdov","doi":"10.23919/URSI.2018.8406700","DOIUrl":"https://doi.org/10.23919/URSI.2018.8406700","url":null,"abstract":"In this paper a modification of a “Compressed Sensing”-based (CS) diagnostics method is presented. The reconstructive diagnostics is carried out in two steps. First, a preliminary diagnostics using CS approach is performed to determine the positions of potentially defect elements. Second, the additional measurements are conducted to improve the diagnostics accuracy. This approach combines the advantages of CS-based and element-wise diagnostics.","PeriodicalId":362184,"journal":{"name":"2018 Baltic URSI Symposium (URSI)","volume":"54 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":"124813610","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: 5
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