Bibliografie tematiche / Radio, Extremely low frequency

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Letteratura scientifica selezionata sul tema "Radio, Extremely low frequency"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 2 febbraio 2022

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Articoli di riviste sul tema "Radio, Extremely low frequency"

1

Sokolowski, M., N. D. R. Bhat, J. P. Macquart, R. M. Shannon, K. W. Bannister, R. D. Ekers, D. R. Scott et al. "No Low-frequency Emission from Extremely Bright Fast Radio Bursts". Astrophysical Journal 867, n. 1 (29 ottobre 2018): L12. http://dx.doi.org/10.3847/2041-8213/aae58d.

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Filonenko, A. D. "Radio Emission of Meteor Bodies in the Extremely Low Frequency Range". Solar System Research 54, n. 5 (settembre 2020): 442–48. http://dx.doi.org/10.1134/s003809462004005x.

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Zantis, Franz P., Ján Hribik e Daniela Ďuračková. "Extremely Low Frequency Signal Acquisition, Recording and Analysis". Journal of Electrical Engineering 67, n. 3 (1 maggio 2016): 185–91. http://dx.doi.org/10.1515/jee-2016-0026.

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Abstract Our environment is permeated by electrical and magnetic alternating waves in the frequency range above the AC voltage of 50 Hz and also in the radio frequency range. Much attention from the public is given to these waves. Through numerous studies and publications about this type of oscillations and waves it is largely known from which sources they occur and which impact they have. However, very little information could be found about electrical and magnetic alternating waves in the frequency range below 50 Hz. The aim of this research is to demonstrate that these signals exist and also to show how the signals look like and where and when they occur. This article gives an overview of the occurrence of these ELF (Extremely Low Frequencies) signals, their specific properties in view of the time domain and in view of the frequency domain and of the possible sources of these waves. Precise knowledge of the structures of the ELF signals allows conclusions about their potential to cause electromagnetic interference in electronic systems. Also other effects in our environment, eg on flora and fauna could be explained.
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Mlynarczyk, Janusz, Andrzej Kulak e Jacobo Salvador. "The Accuracy of Radio Direction Finding in the Extremely Low Frequency Range". Radio Science 52, n. 10 (ottobre 2017): 1245–52. http://dx.doi.org/10.1002/2017rs006370.

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Koemel, Walton C., e Philip S. Callahan. "Relationship of Extremely Low Frequency Radio Emission from Flying Insects to Semiochemical Communication". Annals of the Entomological Society of America 87, n. 5 (1 settembre 1994): 491–97. http://dx.doi.org/10.1093/aesa/87.5.491.

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Antonucci, R., e R. Barvainis. "Low Frequency Cutoffs in the Spectra of Radioquiet Quasars". Symposium - International Astronomical Union 121 (1987): 135–39. http://dx.doi.org/10.1017/s0074180900155032.

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Radio-quiet and normal radio-loud quasars have very similar spectral properties in the ultraviolet, optical and near infrared regions, but their radio powers differ by several orders of magnitude. Somewhere between the near infrared and the radio their spectra must diverge dramatically.The IRAS survey detected 17 radio quiet quasars and luminous Seyfert 1's with −29. 5 ≤ Mv ≤ −21.6 (for Ho = 75). By coadding the survey data and using pointed observations, we have detections of most of these objects in all four IRAS passbands. The spectra are all rising with wavelength all the way to 100μ. We are measuring fluxes in the centimeter, millimeter, and, together with R Cutri, the near infrared and optical regions for each of these objects. Our goal is to constrain the location, shape, and spectral context of the low frequency cutoffs. Here we present the IRAS, millimeter and centimeter data. Measurements at the other wavelengths are still in progress.Although the spectra are rising steeply between 60μ and 100μ, we find that all of our objects are undetectable at 1.3 mm with the NRAO 12-m telescope. Our limits are typically an order of magnitude below the 100μ fluxes. (Ennis et al (1982) and Robson et al (1985) have already shown that the 1 mm fluxes of some radio quiet quasars must be below the extrapolation of the near infrared continuum.) Our objects are all extremely weak or undetected with the VLA at 2 cm and 1.3 cm, at levels typically three orders of magnitude below the 100μ fluxes. The sharpness of the required cutoffs allows us to rule out the hypothesis that the infrared is synchrotron radiation with the cutoff due to an absence of low energy electrons. The high frequency of the cutoffs makes free-free absorption implausible, but not impossible. It is possible that synchrotron self-absorption is suppressing the radio. There is circumstantial evidence that the far infrared is thermal dust emission. This would require a lower cutoff in the distribution of dust temperatures, which we think we can explain.
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Rovenskaya, N. I. "The low-frequency radio recombination lines formed in the extremely extended C II regions". Astronomical & Astrophysical Transactions 26, n. 4-5 (ottobre 2007): 203–9. http://dx.doi.org/10.1080/10556790601135406.

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Ramasawmy, J., J. E. Geach, M. J. Hardcastle, P. N. Best, M. Bonato, M. Bondi, G. Calistro Rivera et al. "Low-frequency radio spectra of submillimetre galaxies in the Lockman Hole". Astronomy & Astrophysics 648 (aprile 2021): A14. http://dx.doi.org/10.1051/0004-6361/202039858.

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Aims. We investigate the radio properties of a sample of 850 μm-selected sources from the SCUBA-2 Cosmology Legacy Survey (S2CLS) using new deep, low-frequency radio imaging of the Lockman Hole field from the Low Frequency Array. This sample consists of 53 sources, 41 of which are detected at >5σ at 150 MHz. Methods. Combining these data with additional observations at 324 MHz, 610 MHz, and 1.4 GHz from the Giant Metrewave Radio Telescope and the Jansky Very Large Array, we find a variety of radio spectral shapes and luminosities (L1.4 GHz ranging from ~4 × 1023−1 × 1025) within our sample despite their similarly bright submillimetre flux densities (>4 mJy). We characterise their spectral shapes in terms of multi-band radio spectral indices. Finding strong spectral flattening at low frequencies in ~20% of sources, we investigate the differences between sources with extremely flat low-frequency spectra and those with ‘normal’ radio spectral indices (α > −0.25). Results. As there are no other statistically significant differences between the two subgroups of our sample as split by the radio spectral index, we suggest that any differences are undetectable in galaxy-averaged properties that we can observe with our unresolved images, and likely relate to galaxy properties that we cannot resolve, on scales ≲1 kpc. We attribute the observed spectral flattening in the radio to free–free absorption, proposing that those sources with significant low-frequency spectral flattening have a clumpy distribution of star-forming gas. We estimate an average spatial extent of absorbing material of at most several hundred parsecs to produce the levels of absorption observed in the radio spectra. This estimate is consistent with the highest-resolution observations of submillimetre galaxies in the literature, which find examples of non-uniform dust distributions on scales of ~100 pc, with evidence for clumps and knots in the interstellar medium. Additionally, we find two bright (>6 mJy) S2CLS sources undetected at all other wavelengths. We speculate that these objects may be very high redshift sources, likely residing at z > 4.
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Mandal, S., I. Prandoni, M. J. Hardcastle, T. W. Shimwell, H. T. Intema, C. Tasse, R. J. van Weeren et al. "Extremely deep 150 MHz source counts from the LoTSS Deep Fields". Astronomy & Astrophysics 648 (aprile 2021): A5. http://dx.doi.org/10.1051/0004-6361/202039998.

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With the advent of new generation low-frequency telescopes, such as the LOw Frequency ARray (LOFAR), and improved calibration techniques, we have now started to unveil the subgigahertz radio sky with unprecedented depth and sensitivity. The LOFAR Two Meter Sky Survey (LoTSS) is an ongoing project in which the whole northern radio sky will be observed at 150 MHz with a sensitivity better than 100 μJy beam−1 at a resolution of 6′′. Additionally, deeper observations are planned to cover smaller areas with higher sensitivity. The Lockman Hole, the Boötes, and the Elais-N1 regions are among the most well known northern extra-galactic fields and the deepest of the LoTSS Deep Fields so far. We exploited these deep observations to derive the deepest radio source counts at 150 MHz to date. Our counts are in broad agreement with those from the literature and show the well known upturn at ≤1 mJy, mainly associated with the emergence of the star-forming galaxy population. More interestingly, our counts show, for the first time a very pronounced drop around S ~ 2 mJy, which results in a prominent “bump” at sub-mJy flux densities. Such a feature was not observed in previous counts’ determinations (neither at 150 MHz nor at a higher frequency). While sample variance can play a role in explaining the observed discrepancies, we believe this is mostly the result of a careful analysis aimed at deblending confused sources and removing spurious sources and artifacts from the radio catalogs. This “drop and bump” feature cannot be reproduced by any of the existing state-of-the-art evolutionary models, and it appears to be associated with a deficiency of active galactic nuclei (AGN) at an intermediate redshift (1 < z < 2) and an excess of low-redshift (z < 1) galaxies and/or AGN.
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Jung, Ji S., Jung N. Lee, Joung M. Kim e Jong K. Park. "An UHF RFID Reader Antenna with Multitag Identification for Extremely Low-Temperature Medical Systems". International Journal of Antennas and Propagation 2020 (10 luglio 2020): 1–11. http://dx.doi.org/10.1155/2020/2482961.

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A radio frequency identification reader antenna having multitag identification for medical systems is presented, which consists of four PIFAs, two hybrid couplers, and four power dividers. The high isolation is achieved by the symmetric design of the antenna geometry and four power dividers, which are fed by two hybrid couplers. The experimental results show an isolation of more than 40 dB in the North American (902–928 MHz), Korean (917–923.5 MHz), and Japanese (916.7–923.5 MHz) RFID frequency bands.
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Tesi sul tema "Radio, Extremely low frequency"

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Forssén, Ulla. "Extremely low frequency magnetic fields and breast cancer /". Stockholm, 2003. http://diss.kib.ki.se/2003/91-7349-532-8/.

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Ker, Louise Moira. "Radio AGN evolution with low frequency radio surveys". Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7616.

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Supermassive black holes are leading candidates for the regulation of galaxy growth and evolution over cosmic time, via ‘feedback’ processes, whereby outflows from the Active Galactic Nuclei (AGN) halt star formation within the galaxy. AGN feedback is generally thought to occur in two modes, high-excitation (HERG, or ‘quasar-mode’) and low-excitation (LERG or ’radio-mode’) each having a different effect on the host galaxy. LERGs curtail the growth of the most massive galaxies, whereas HERGs are thought to be activated by mergers/interactions, switching off star formation at high redshift. A critical problem in current extragalactic astrophysics lies in understanding the precise physical mechanisms by which these feedback processes operate, and how they evolve over cosmic time. Radio-loud AGN are an essential tool for studying major feedback mechanisms, as they are found within the largest ellipticals, and hence are beacons for the most massive black holes across the bulk of cosmic time. In this thesis I develop and study existing complete radio samples with extensive new multi-wavelength data in the radio, optical and infrared, aiming to investigate the evolution of AGN feedback modes, and methods to locate and study such systems at the very highest redshifts. This will serve to inform further studies of radio-AGN planned with next generation radio instruments such as the LOw Frequency ARray (LOFAR). Very few radio-loud AGN systems are currently known at high redshifts, and the effectiveness of traditional high redshift selection techniques, such as selection based on steep spectral index, have not been well quantified. A purely evidence-based approach to determining the efficiency of various high redshift selection techniques is presented, using nine highly spectroscopically complete radio samples; although weak correlations are confirmed between spectral index and linear size and redshift, selection first of infrared-faint radio sources remains by far the most efficient method of selecting high-z radio galaxies from complete samples. Radio spectral curvature in four of the complete samples is analysed and the effect of radio spectral shape on the measurement of the radio luminosity function (RLF) of steep-spectrum radio sources is investigated. Below z=1, curvature has negligible effect on the measurement of the RLF, however at higher redshifts, where source numbers are low, the shape of the radio spectrum should be taken into account, as individual source luminosities can change up to 0.1-0.2 dex, and this can in some cases introduce errors in space density measurements of up to a factor of 2-3 where source numbers are low. Building upon these samples, the very first independent determinations of the separate RLFs for high and low excitation radio sources across the bulk of cosmic time are made, out to z=1. Here it is shown that HERGs show very clear signs of strong evolution, in line with theoretical predictions. LERGs also show some very weak evolution with redshift, showing increases in space density of typically around a factor of 2. These measurements are also used to estimate the contribution of LERGs, which typically show weak or no emission lines to the ‘missing redshift’ population, which are sources within the complete samples not identifiable spectroscopically. Complementary to this, a pilot study is presented in selecting ‘missing redshift’ sources which are classed as infra-red faint (IFRS), which show no optical or near-IR identification, and are compact in the radio. Follow up spectroscopy on these candidate high z sources detected no line emission. Finally, work carried out towards the testing and commissioning of the new LOFAR telescope is presented. The findings from this thesis will serve to both streamline and inform high redshift radio-AGN searches and studies planned to be carried out with LOFAR and other multi-wavelength complementary surveys in the near future, and help to open up an as yet unexplored epoch in radio-AGN formation and evolution.
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Lazenby, Andrea Natalie. "Extremely low frequency magnetic field exposure in British railway environments". Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555811.

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Exposure to extremely low frequency magnetic fields has been investigated in relation to various health effects. In the past, epidemiological studies have focused on residential and occupational exposures. The time spent commuting to work may not be insignificant, therefore any exposures acquired during those periods may have an effect on the strength of association. Given that millions of train journeys are made in Britain every year, extremely low frequency and static magnetic field measurements were made on six types of British trains and on five station platforms in order to characterise passenger exposure. Trains investigated included four elec- trical multiple units, one diesel-electrical multiple unit and one diesel locomotive. Power to the electric trains was supplied by either overhead cables (25 kV 50 Hz a.c.), the third rail (750 V d.c.) or from a four-rail system (630 V d.c.). The highest resultant a.c. magnetic field was measured on-board a diesel-electric multiple unit. The a.c. magnetic field was shown to vary with height above the carriage floor. The majority of resultant a.c. magnetic fields were higher closer to the floor, attributable to traction equipment mounted beneath the carriage. Average resultant a.c. magnetic fields at waist height across all train types were in the range 0.03-1.82 /-LT. The frequency component of the resultant a.c. magnetic field was shown to vary with increasing and decreasing speed on-board two different train types. The a.c. and d.c. magnetic field waveforms measured at different stations were dependent on the railway electrification and the types of train travelling on the line. Frequency spectra calculated from magnetic field waveforms taken on two station platforms showed component frequencies which were not multiples of the 50 Hz fundamental. Metrics such as the polarisation, total harmonic distortion and rate of change metric are considered, together with standard statistical measures of magnetic field.
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Shepherd, Sebastian James. "The effects of extremely low frequency electromagnetic fields on insects". Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/422277/.

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Flying insect species are currently in decline, including many species that provide important pollination ecosystem services. Combined exposure to various environmental stressors are associated with insect declines, including land-use change, pesticide use and climate change, but the potential biological and environmental effects of extremely low frequency electromagnetic fields (ELF EMFs) are poorly understood. ELF EMFs are pervasive in the environment, and anthropogenic ELF EMF pollution has increased greatly in recent years. Despite this, little has been done to consider the potential environmental impacts of ELF EMFs. Given that there is evidence that ELF EMFs can have biological effects, it is important to explore these biological stimuli and their potential to affect insects in the environment. Here the biological effects of ELF EMFs on important insect species were investigated, with two-fold aims of both increasing understanding of the biological effects of ELF EMFs, and determining whether field-realisitc levels of ELF EMFs have the potential to cause envrionemental stress to insects. ELF EMF impacts were investigated with the desert locust, as an economically important agricultural pest and a species that provides utility in understanding insect neurophysiology, and the honey bee, as a globally important pollinator and a well known study species for insect cognitive behaviour. Short-term exposure to high levels of ELF EMFs was found to affect neurophysiology, and reduce locomotory function in locusts, as well as increase stress protein levels in bees and locusts, and affect honey bee cognitive behaviour. Acute exposure to ELF EMFs at levels that can be encountered regularly in the environment around man-man sources for ELF EMFs reduced honey bee performance in olfactory learning assays, affected flight behaviour, and affected feeding and flight performance in a semi-field scenario. Further to this, some of these impacts of ELF EMFs on cognitive behaviour and flight were reduced when ELF EMFs were applied in combination with other well-known environmental stressors, neonicotinoid insecticides. These findings give a more detailed indication of some of the physiological effects that may underpin changes in insect locomotory behaviour that occur after short-term exposure. This is the first time that powerline simulating ELF EMFs have been directly measured and applied to insects in the context of considering the ecological effects (and thus using field-realistic exposure levels) of the ELF EMFs, rather than just the biological effects. This is the first indication that short-term and acute ELF EMF exposure can affect insect cognitive behaviour, and these effects have been shown to occur at levels which can be encountered in the field by a globally important pollinator species, the honey bee. This is also the first indication that acute field-realistic ELF EMF exposure can affect insect locomotory behaviour in the environement. This research describes new effects of ELF EMFs on insect biology and establishes that ELF EMFs have a potential to affect insect ecology, such that future ELF EMF understanding must be focused in further exploring mechanisms by with ELF EMFs cause biological effects, as well as the larger scale ecological risk assessment of ELF EMF impacts from powerlines.
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Belcher, Robert W. "Extremely High Frequency (EHF) Low Probability of Intercept (LPI) communication applications". Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA226653.

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Thesis (M.S. in Telecommunications Systems Management)--Naval Postgraduate School, March 1990.
Thesis Advisor(s): Schwendtner, Thomas A. Second Reader: Davidson, K. L. "March 1990." Description based on title screen as viewed on August 25, 2009. DTIC Descriptor(s): Interception probabilities, communication and radio systems, communications networks, spectra, command and control systems, extremely high frequency, naval operations, tactical warfare, low rate, theses, scenarios, line of sight, military applications. Author(s) subject terms: Millimeter wave, EHF, Extremely High Frequency, LPI, Low Probability of Intercept. Includes bibliographical references (p. 68-70). Also available print.
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Deadman, Jan-Erik. "Estimation of exposures to extremely low frequency electric and magnetic fields". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ29919.pdf.

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Koyama, Shin. "Genotoxic effects of extremely low frequency electromagnetic fields and radiofrequency radiation". Kyoto University, 2007. http://hdl.handle.net/2433/136436.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(人間・環境学)
甲第13165号
人博第372号
新制||人||91(附属図書館)
18||D||173(吉田南総合図書館)
UT51-2007-H438
京都大学大学院人間・環境学研究科相関環境学
(主査)教授 小松 賢志, 助教授 倉橋 和義, 助教授 三浦 智行
学位規則第4条第1項該当
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Murji, Rizwan Deen M. Jamal. "Low-power CMOS radio frequency integrated circuits for frequency synthesis /". *McMaster only, 2005.

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Stephens, P. W. "Low frequency mapping with MERLIN". Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382763.

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Spinks, M. J. "Low frequency long baseline interferometry". Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372284.

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Libri sul tema "Radio, Extremely low frequency"

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Surkov, Vadim, e Masashi Hayakawa. Ultra and Extremely Low Frequency Electromagnetic Fields. Tokyo: Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-54367-1.

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author, Hayakawa Masashi, a cura di. Ultra and extremely low frequency electromagnetic fields. Tokyo: Springer, 2014.

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Hitchcock, R. Timothy. Extremely low frequency (ELF) electric and magnetic fields \. Fairfax, Va: AIHA, 1995.

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Andres, Peratta, a cura di. Modelling the human body exposure to ELF electric fields. Southampton, UK: WIT, 2010.

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Heald, George, John McKean e Roberto Pizzo, a cura di. Low Frequency Radio Astronomy and the LOFAR Observatory. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-23434-2.

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Braithwaite, Nicholas (Nicholas St. J.), a cura di. Physics of radio-frequency plasmas. Cambridge: Cambridge University Press, 2011.

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Gomirato, Paula M. Alterations in naming during the application of extremely-low frequency electromagnetic fields. Sudbury, Ont: Laurentian University, Department of Psychology, 1986.

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Cantwell, Thérèse. Low Frequency Radio Observations of Galaxy Clusters and Groups. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97976-2.

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An evaluation of the U.S. Navy's extremely low frequency communications system ecological monitoring program. Washington, D.C: National Academy Press, 1997.

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Walborg, Earl F. Extremely low frequency electromagnetic fields and cancer: Focus on tumor initiation, promotion, and progression. Washington, DC (2101 L St., N.W., Washington 20037): NEMA, 1991.

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Capitoli di libri sul tema "Radio, Extremely low frequency"

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Israel, M. "Exposure Assessment of Extremely Low Frequency, Radiofrequency and Microwave Radiation: Methods and Standards for Databases". In Radio Frequency Radiation Dosimetry and Its Relationship to the Biological Effects of Electromagnetic Fields, 259–69. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4191-8_29.

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Weik, Martin H. "extremely low frequency". In Computer Science and Communications Dictionary, 561. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_6694.

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Habash, Riadh. "Extremely low frequency field safety". In BioElectroMagnetics, 97–138. Second edition. | Boca Raton, FL : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9780429184093-5.

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Wood, Andrew. "Extremely Low-Frequency (ELF) Guidelines". In Non-ionizing Radiation Protection, 281–97. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119284673.ch18.

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Kaune, William T., e Richard D. Phillips. "Dosimetry for Extremely Low-Frequency Electric Fields". In Biological Effects and Dosimetry of Static and ELF Electromagnetic Fields, 145–65. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2099-9_9.

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Cohen, Richard, e Peter H. Wald. "MICROWAVE, RADIOFREQUENCY, and EXTREMELY LOW-FREQUENCY ENERGY". In Physical and Biological Hazards of the Workplace, 215–21. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119276531.ch15.

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Wilson, Bary W., e Jeffrey D. Saffer. "Extremely Low Frequency Electromagnetic Fields and Cancer". In Chemical Induction of Cancer, 645–74. Boston, MA: Birkhäuser Boston, 1995. http://dx.doi.org/10.1007/978-1-4612-4076-1_35.

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Heald, George. "Introduction to Low Frequency Radio Astronomy". In Low Frequency Radio Astronomy and the LOFAR Observatory, 3–17. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-23434-2_1.

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Papananos, Yannis E. "Low Noise Amplifiers". In Radio-Frequency Microelectronic Circuits for Telecommunication Applications, 105–33. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4757-3017-3_5.

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Hazzard, Kaden Richard Alan. "Radio-Frequency Spectroscopy: Broad Introduction". In Quantum Phase Transitions in Cold Atoms and Low Temperature Solids, 33–35. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-8179-0_3.

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Atti di convegni sul tema "Radio, Extremely low frequency"

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Goutelard, C. "Coding and sounding: extremely low power sounder". In 7th International Conference on High Frequency Radio Systems and Techniques. IEE, 1997. http://dx.doi.org/10.1049/cp:19970771.

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2

Ercoli, Mariano, Daniela Dragomirescu, Didier Belot e Robert Plana. "An extremely low consumption, 53mW, 65nm CMOS transmitter for 60 GHz UWB applications". In 2012 IEEE Radio Frequency Integrated Circuits Symposium (RFIC). IEEE, 2012. http://dx.doi.org/10.1109/rfic.2012.6242322.

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3

Kaur, Harleen, Shivali Verma e A. K. Gwal. "Investigation of nonlinear interaction in extremely low frequency /very low frequency radio signals in the course of the two mid latitude earthquakes". In 2019 URSI Asia-Pacific Radio Science Conference (AP-RASC). IEEE, 2019. http://dx.doi.org/10.23919/ursiap-rasc.2019.8738403.

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4

Zhebsain, Vasiliy V., e Oleg R. Rexlyasov. "Neural network modeling of the frequency dependence of the attenuation coefficient of radio waves propagating under extremely low atmospheric temperatures". In 9TH INTERNATIONAL CONFERENCE ON MATHEMATICAL MODELING: Dedicated to the 75th Anniversary of Professor V.N. Vragov. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0042203.

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5

Kroupa. "Extremely Low Frequency Noise in Oscillators". In Conference on Precision Electromagnetic Measurements. IEEE, 1988. http://dx.doi.org/10.1109/cpem.1988.671192.

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Liu, Xiaomin, e Haiyang Zhou. "Numerical Investigations of Flow Separation Control for a Low Pressure Turbine Blade Using Steady and Pulsed Vortex Generator Jets". In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22587.

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Abstract (sommario):
This paper investigated numerically the application of Vortex Generator Jets (VGJs) to control flow separation on the suction side of a low pressure turbine blade. Firstly, numerical simulations of flow separation for a LPT blade, which based on Menter’s SST k-ω turbulence model coupled with Langtry-Menter transition model, were performed for different Reynolds numbers Re∼100,000, 75,000, 50,000 and 25,000, for three freestream turbulence intensity (FSTI) of 0.08%, 2.35% and 6.0%. The pressure distributions around the turbine blade and streamline plots showing the flow separation were presented in this paper. Good agreement of the numerical and experimental results also showed the validity of the numerical scheme for simulating the flow separation occurring on a low pressure turbine blade. And then, steady Vortex Generator Jets (steady VGJs) having pitch angle of 30°, skew angle of 90°, blowing ratio of 2.0 were used to control the flow separation in the suction side of the low pressure turbine blade. Although steady VGJs have been illustrated to be extremely robust at suppressing low Reynolds number separation, the practical application of VGJs in the low pressure turbine engine is in the pulsed mode. The injection mass flow requirements of pulsed Vortex Generator Jets (pulsed VGJs) can be reduced drastically when similar flow control effect is obtained using steady VGJs. For pulsed VGJs, the pulse frequency has been found to be an important control parameter for the flow separation control. In this paper, cases with the duty cycle of 0.5 were studied for the pulse frequency ranging from 2.5Hz to 10Hz at Re = 25,000 and freestream turbulence level of 0.08%. The numerical results showed that pulsed VGJs can effectively reduce and even eliminate the flow separation on the blade suction surface while there is an optimal pulse frequency. The flow control mechanism of VGJs on LPT blade was also revealed.
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Mitchell, Gregory, e Wasyl Wasylkiwskyj. "Extremely low profile wideband UHF antenna". In 2015 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium). IEEE, 2015. http://dx.doi.org/10.1109/usnc-ursi.2015.7303460.

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Nakano, H., J. Miyake, T. Sakurada, M. Oyama, Y. Iitsuka e J. Yamauchi. "Extremely low-profile metamaterial-based curl antenna". In 2012 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting. IEEE, 2012. http://dx.doi.org/10.1109/aps.2012.6349280.

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Gonzalez, Cristina, Andres Peratta e Dragan Poljak. "Pregnant woman exposed to extremely low frequency electromagnetic fields". In 2008 16th International Conference on Software, Telecommunications and Computer Networks. IEEE, 2008. http://dx.doi.org/10.1109/softcom.2008.4669443.

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Isokorpi, Jari, Tommi Keikko e Leena Korpinen. "Attenuation of extremely low frequency magnetic fields from appliances". In 1998 Symposium on Antenna Technology and Applied Electromagnetics. IEEE, 1998. http://dx.doi.org/10.1109/antem.1998.7861723.

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Rapporti di organizzazioni sul tema "Radio, Extremely low frequency"

1

Hiebert, D. G. Office worker exposure to extremely low frequency magnetic fields. Office of Scientific and Technical Information (OSTI), maggio 1994. http://dx.doi.org/10.2172/672124.

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2

Fraser-Smith, A. C., P. R. McGill, A. Bernardi, R. A. Helliwell e M. E. Ladd. Global Measurements of Low-Frequency Radio Noise. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1992. http://dx.doi.org/10.21236/ada248260.

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Fraser-Smith, A. C., e C. C. Teague. Low Frequency Radio Research at Thule, Greenland. Fort Belvoir, VA: Defense Technical Information Center, gennaio 1998. http://dx.doi.org/10.21236/ada360991.

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4

Chrissan, Douglas A. Statistical Analysis and Modeling of Low-Frequency Radio Noise and Improvement of Low-Frequency Communications. Fort Belvoir, VA: Defense Technical Information Center, agosto 1998. http://dx.doi.org/10.21236/ada360417.

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5

Sweeney, J. J. An investigation of the usefulness of extremely low-frequency electromagnetic measurements for treaty verification. Office of Scientific and Technical Information (OSTI), gennaio 1989. http://dx.doi.org/10.2172/6294530.

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Drallos, P. J., e M. E. Riley. Boltzmann-equation simulations of radio-frequency-driven, low-temperature plasmas. Office of Scientific and Technical Information (OSTI), gennaio 1995. http://dx.doi.org/10.2172/83882.

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Casey, Joseph P. Extremely Low Frequency (ELF) Propagation Formulas for Dipole Sources Radiating in a Spherical Earth-Ionosphere Waveguide. Fort Belvoir, VA: Defense Technical Information Center, maggio 2002. http://dx.doi.org/10.21236/ada405897.

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8

Koons, Harry C. An ELF (Extremely-Low-Frequency) Transmitter Experiment for the Space Shuttle. (The NASC-201 (Naval Air Space Command) Experiment). Volume 1. Fort Belvoir, VA: Defense Technical Information Center, settembre 1986. http://dx.doi.org/10.21236/ada178237.

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9

Kishiyama, K., S. Shen, D. Behne, N. G. Wilson, D. Schrage e R. Valdiviez. Testing of vacuum pumps for the Accelerator Production of Tritium/Low Energy Demonstration Accelerator radio frequency quadrupole. Office of Scientific and Technical Information (OSTI), dicembre 1998. http://dx.doi.org/10.2172/335188.

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10

Davis, Robert F., e Kevin J. Linthicum. Materials Processing and Device Development to Achieve Integration of Low Defect Density III Nitride Based Radio Frequency. Fort Belvoir, VA: Defense Technical Information Center, ottobre 2000. http://dx.doi.org/10.21236/ada383629.

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