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

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 28 luglio 2025

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1

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

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2

Filonenko, A. D. "Radio Emission of Meteor Bodies in the Extremely Low Frequency Range." Solar System Research 54, no. 5 (2020): 442–48. http://dx.doi.org/10.1134/s003809462004005x.

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3

Zantis, Franz P., Ján Hribik, and Daniela Ďuračková. "Extremely Low Frequency Signal Acquisition, Recording and Analysis." Journal of Electrical Engineering 67, no. 3 (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 als

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4

Mlynarczyk, Janusz, Andrzej Kulak, and Jacobo Salvador. "The Accuracy of Radio Direction Finding in the Extremely Low Frequency Range." Radio Science 52, no. 10 (2017): 1245–52. http://dx.doi.org/10.1002/2017rs006370.

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5

Koemel, Walton C., and Philip S. Callahan. "Relationship of Extremely Low Frequency Radio Emission from Flying Insects to Semiochemical Communication." Annals of the Entomological Society of America 87, no. 5 (1994): 491–97. http://dx.doi.org/10.1093/aesa/87.5.491.

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6

Antonucci, R., and 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 a

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7

Mandal, S., I. Prandoni, M. J. Hardcastle, et al. "Extremely deep 150 MHz source counts from the LoTSS Deep Fields." Astronomy & Astrophysics 648 (April 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 mos

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8

Ramasawmy, J., J. E. Geach, M. J. Hardcastle, et al. "Low-frequency radio spectra of submillimetre galaxies in the Lockman Hole." Astronomy & Astrophysics 648 (April 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

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9

Jung, Ji S., Jung N. Lee, Joung M. Kim, and Jong K. Park. "An UHF RFID Reader Antenna with Multitag Identification for Extremely Low-Temperature Medical Systems." International Journal of Antennas and Propagation 2020 (July 10, 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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10

Rovenskaya, N. I. "The low-frequency radio recombination lines formed in the extremely extended C II regions." Astronomical & Astrophysical Transactions 26, no. 4-5 (2007): 203–9. http://dx.doi.org/10.1080/10556790601135406.

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11

Kansabanik, Devojyoti, Apurba Bera, Divya Oberoi, and Surajit Mondal. "Tackling the Unique Challenges of Low-frequency Solar Polarimetry with the Square Kilometre Array Low Precursor: Pipeline Implementation." Astrophysical Journal Supplement Series 264, no. 2 (2023): 47. http://dx.doi.org/10.3847/1538-4365/acac79.

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Abstract The dynamics and the structure of the solar corona are determined by its magnetic field. Measuring coronal magnetic fields is, however, extremely hard. The polarization of low-frequency radio emissions has long been recognized as one of the few effective observational probes of magnetic fields in the mid and high corona. However, the extreme intrinsic variability of this emission, the limited ability of most of the available existing instrumentation (until recently) to capture it, and the technical challenges involved have all contributed to its use being severely limited. The high dy

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12

Valentino, Straser. "Atmospheric plasmas research linked to electromagnetic signals and earthquakes." Technology audit and production reserves 6, no. 1(68) (2022): 6–9. https://doi.org/10.15587/2706-5448.2022.270465.

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<em>This paper presents the outcome of monitoring aimed at studying seismic precursor candidates with a multi-parameter system, carried out at a Science Camp in July 2022 in the northwestern Italian Apennines, in the province of Parma. Pre seismic signals, closely related to the preparatory stages of an earthquake, were detected with a crustal diagnosis, based on physical signals, generated by tectonic stress. The instrumental results show a potential temporal concatenation, which describe, at the level of hypothesis, the phases of the ongoing tectonic stress. The model followed Zou’s th

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13

Eskandani, Ramin, and Mohammad Ismail Zibaii. "Unveiling the biological effects of radio-frequency and extremely-low frequency electromagnetic fields on the central nervous system performance." BioImpacts 14, no. 4 (2023): 30064. http://dx.doi.org/10.34172/bi.2023.30064.

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Introduction: Radiofrequency electromagnetic radiation (RF-EMR) and extremely low-frequency electromagnetic fields (ELF-EMF) have emerged as noteworthy sources of environmental pollution in the contemporary era. The potential biological impacts of RF-EMR and ELF-EMF exposure on human organs, particularly the central nervous system (CNS), have garnered considerable attention in numerous research studies. Methods: This article presents a comprehensive yet summarized review of the research on the explicit/implicit effects of RF-EMR and ELF-EMF exposure on CNS performance. Results: Exposure to RF-

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14

Urbinello*, Damiano, Benjamin Struchen, and Martin Röösli. "Characterization of Radio- and Extremely Low-Frequency Electromagnetic Fields in Everyday Environments in Three European Cities." ISEE Conference Abstracts 2014, no. 1 (2014): 1662. http://dx.doi.org/10.1289/isee.2014.p1-262.

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15

Havas, M. "Biological effects of non-ionizing electromagnetic energy: A critical review of the reports by the US National Research Council and the US National Institute of Environmental Health Sciences as they relate to the broad realm of EMF bioeffects." Environmental Reviews 8, no. 3 (2000): 173–253. http://dx.doi.org/10.1139/a00-004.

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Our dependence on electricity and our growing dependence on wireless telecommunication technology is causing this planet to be inundated with electromagnetic energy ranging in frequency from less than 60 Hz to greater than 2 GHz. Concerns expressed by the public, who live near power lines, cell phone antennas, or television and radio broadcast towers, have prompted two major reviews: one by the US National Research Council (NRC) and the other by the US National Institute of Environmental Health Science (NIEHS). Both of these documents deal with the biological and health effects primarily in a

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16

Kuzay, D., C. Ozer, B. Sirav, A. G. Canseven, and N. Seyhan. "Oxidative effects of extremely low frequency magnetic field and radio frequency radiation on testes tissues of diabetic and healthy rats." Bratislava Medical Journal 118, no. 05 (2017): 278–82. http://dx.doi.org/10.4149/bll_2017_055.

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17

Selmaoui, Brahim. "Effects of extremely low frequency (ELF) and radio-frequency (RF) on melatonin and cortisol, two markers of the circadian rhythms." Toxicology Letters 280 (October 2017): S31. http://dx.doi.org/10.1016/j.toxlet.2017.07.076.

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18

Tereshchenko, E. D., V. F. Grigor’ev, A. E. Sidorenko, et al. "On the possibility of quasi-vertical radio sounding of the ionosphere in the extremely low frequency band." JETP Letters 85, no. 8 (2007): 386–88. http://dx.doi.org/10.1134/s0021364007080085.

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19

Nicol, T. H., C. Edwards, R. C. Dhuley, and J. C. Thangaraj. "Conduction cooled cryostat for small-scale superconducting radio frequency accelerator applications." IOP Conference Series: Materials Science and Engineering 1301, no. 1 (2024): 012049. http://dx.doi.org/10.1088/1757-899x/1301/1/012049.

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Abstract Fermilab’s Illinois Accelerator Research Center (IARC) is designing small-scale, ∼10 MeV prototype conduction cooled superconducting accelerators for projects ranging from medical device sterilization to road pavement modification. These accelerators are built using high-Q Nb3Sn coated superconducting radio-frequency cavities. The cryostat design for one such prototype being developed for the U.S. Army Engineer Research Development Center (ERDC) will be described. Cryostats for such conduction cooled accelerators require stringent control of thermal losses since the available power fr

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20

Mondal, Surajit, Divya Oberoi, Ayan Biswas, and Devojyoti Kansabanik. "Characterizing the Spectral Structure of Weak Impulsive Narrowband Quiet Sun Emissions." Astrophysical Journal 953, no. 1 (2023): 4. http://dx.doi.org/10.3847/1538-4357/acdf4f.

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Abstract Weak Impulsive Narrowband Quiet Sun Emissions (WINQSEs) are a newly discovered class of radio emission from the solar corona. These emissions are characterized by their extremely impulsive, narrowband, and ubiquitous nature. We have systematically been working on their detailed characterization, including their strengths, morphologies, temporal characteristics, energies, etc. This work is the next step in this series and focuses on the spectral nature of WINQSEs. Given that their strength is only a few percent of the background solar emission, we have adopted an extremely conservative

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21

Schellenberger, Gerrit, Ewan O’Sullivan, Simona Giacintucci, et al. "Feedback in the Extremely Violent Group Merger NGC 6338." Astrophysical Journal 948, no. 2 (2023): 101. http://dx.doi.org/10.3847/1538-4357/acc52e.

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Abstract The galaxy group NGC 6338 is one of the most violent group–group mergers known to date. While the central dominant galaxies rush at each other at 1400 km s−1 along the line of sight, with dramatic gas heating and shock fronts detected, the central gas in the BCGs remains cool. There are also indications of feedback from active galactic nuclei, and neither subcluster core has been disrupted. With our deep radio uGMRT data at 383 and 650 MHz, we clearly detect a set of large, old lobes in the southern BCG coinciding with the X-ray cavities, while the northern and smaller BCG appears sli

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22

Straser, Valentino. "Atmospheric plasmas research linked to electromagnetic signals and earthquakes." Technology audit and production reserves 6, no. 1(68) (2022): 6–9. http://dx.doi.org/10.15587/2706-5448.2022.270465.

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Abstract (sommario):

This paper presents the outcome of monitoring aimed at studying seismic precursor candidates with a multi-parameter system, carried out at a Science Camp in July 2022 in the northwestern Italian Apennines, in the province of Parma. Pre seismic signals, closely related to the preparatory stages of an earthquake, were detected with a crustal diagnosis, based on physical signals, generated by tectonic stress. The instrumental results show a potential temporal concatenation, which describe, at the level of hypothesis, the phases of the ongoing tectonic stress. The model followed Zou’s theories who

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23

Shapirovskaya, N., O. B. Slee, P. Hughes, and G. Tsarevsky. "Radio Source Variability as a Tool for Very High Resolution." Symposium - International Astronomical Union 158 (1994): 201–3. http://dx.doi.org/10.1017/s0074180900107582.

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If flux density variability is intrinsic to extragalactic sources, then the shortest time scale of the variability yields an extremely high angular resolution. There is, however, good evidence that some of the variability is due to refractive scintillation in our galaxy's interstellar plasma turbulence. The effect, initially discovered at low radio frequencies, is here shown to extend into the GHz band, which, up to now, has been assumed to display only the intrinsic variability. We conclude that further study in both the intermediate and high frequency bands needed to separate the intrinsic a

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24

Urquhart, Ryan, Lauren I. McDermott, Jay Strader, et al. "X-Ray and Radio Observations of Central Black Holes in Nearby Low-mass Early-type Galaxies: Preliminary Evidence for Low Eddington Fractions." Astrophysical Journal 940, no. 2 (2022): 111. http://dx.doi.org/10.3847/1538-4357/ac96e6.

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Abstract We present new radio and X-ray observations of two nearby (<4 Mpc) low-mass early-type galaxies with dynamically confirmed central black holes: NGC 5102 and NGC 205. NGC 5102 shows a weak nuclear X-ray source and has no core radio emission. However, for the first time we demonstrate that it shows luminous extended radio continuum emission in low-resolution, low-frequency (<3 GHz) data, consistent with jet lobes on scales ≳100 pc formed from past accretion and jet activity. By contrast, in new, extremely deep, strictly simultaneous Very Large Array and Chandra observations, no ra

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25

Cios, Aleksandra, Martyna Ciepielak, Wanda Stankiewicz, and Łukasz Szymański. "The Influence of the Extremely Low Frequency Electromagnetic Field on Clear Cell Renal Carcinoma." International Journal of Molecular Sciences 22, no. 3 (2021): 1342. http://dx.doi.org/10.3390/ijms22031342.

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The development of new technologies and industry is conducive to the increase in the number and variety of electromagnetic field (EMF) sources in our environment. The main sources of EMF are high-voltage lines, household appliances, audio/video devices, mobile phones, radio stations, and radar devices. In the growing use of electronic devices, scientists are increasingly interested in the effects of EMF on human health. Even though many studies on the effects of EMF have already been carried out, none of them has shown a significant effect on mammals, including humans. Moreover, it is not enti

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26

Abdelhadi, Namoune, Hamid Azzedine, and Taleb Rachid. "The Performance of an Integrated Transformer in a DC/DC Converter." TELKOMNIKA Telecommunication, Computing, Electronics and Control 15, no. 3 (2017): 1031–39. https://doi.org/10.12928/TELKOMNIKA.v15i3.4251.

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The separation between the low-voltage part and high-voltage part of the converter is formed by a transformer that transfers power while jamming the DC ring. The resonant mode power oscillator is utilized to allow elevated competence power transfer. The on-chip transformer is probable to have elevated value inductance, elevated quality factors and elevated coupling coefficient to decrease the loss in the oscillation. The performance of a transformer is extremely dependent on the structure, topology and other essential structures that create it compatible with the integrated circuits IC process

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27

Zhang, Bing. "Coherent Inverse Compton Scattering by Bunches in Fast Radio Bursts." Astrophysical Journal 925, no. 1 (2022): 53. http://dx.doi.org/10.3847/1538-4357/ac3979.

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Abstract The extremely high brightness temperature of fast radio bursts (FRBs) requires that their emission mechanism must be “coherent,” either through concerted particle emission by bunches or through the exponential growth of a plasma wave mode or radiation amplitude via certain maser mechanisms. The bunching mechanism has been mostly discussed within the context of curvature radiation or cyclotron/synchrotron radiation. Here we propose a family of models invoking the coherent inverse Compton scattering (ICS) of bunched particles that may operate within or just outside of the magnetosphere

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28

Shetty, Sagar, Rohit Hajare, Kriti Gupta, and Namrata Bhagat. "ANALYSIS OF UWB BASED ANTENNA FOR WIRELESS COMMUNICATION." INTERNATIONAL JOURNAL OF ENGINEERING TECHNOLOGIES AND MANAGEMENT RESEARCH 5, no. 2 :SE (2018): 30–34. https://doi.org/10.5281/zenodo.1196750.

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Ultra-wideband wireless communications techniques have many merits, including an extremely simple radio that inherently leads to low-cost design, large processing gain for robust operations in the presence of narrowband interference, covert operations, and fine time resolution for accurate position sensing. However, there are a number of challenges in UWB receiver design, such as capturing multipath energy, inter symbol interference especially in a non-line-of-sight environment, and the need for high-sampling-rate analog-to-digital converters. Microstrip Patch antenna (MPA) provides low profil

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Khazan, V. L., V. F. Myshkin, I. I. Pavlov, V. A. Khan, and M. S. Zavyalov. "HIGH PERFORMANCE MODEM FOR UNDERWATER COMMUNICATION SYSTEMS." DYNAMICS OF SYSTEMS, MECHANISMS AND MACHINES 11, no. 4 (2023): 37–43. http://dx.doi.org/10.25206/2310-9793-2023-11-4-37-43.

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The algorithm of operation of the modem with increased energy efficiency with quadrature intrapulse phase modulation (QIPPM) in radio lines using extremely low frequencies for underwater communication is described. In this case, the increase in energy efficiency of the modem with QIPPM is achieved by reducing its frequency efficiency and introducing additional code redundancy. This allows for a 2-fold increase in depth for underwater communication. At the same time the probability of erroneous reception of code combinations is reduced to a minimum.

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Sridhar, Sarrvesh S., Raffaella Morganti, Kristina Nyland, Bradley S. Frank, Jeremy Harwood, and Tom Oosterloo. "LOFAR view of NGC 3998, a sputtering AGN." Astronomy & Astrophysics 634 (February 2020): A108. http://dx.doi.org/10.1051/0004-6361/201936796.

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Low-power radio sources dominate the radio sky. They tend to be small in size and dominated by their cores, but the origin of their properties and the evolution of their radio plasma are not well constrained. Interestingly, there is mounting evidence that low-power radio sources can significantly affect their surrounding gaseous medium and may therefore be more relevant for galaxy evolution than previously thought. In this paper, we present low radio frequency observations obtained with LOFAR at 147 MHz of the radio source hosted by NGC 3998. This is a rare example of a low-power source that i

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Nickolaenko, A. P. "Parametric excitation of an extremely low-frequency radio pulse by an extragalactic gamma-ray burst on December 27, 2004." Radiophysics and Quantum Electronics 53, no. 4 (2010): 215–24. http://dx.doi.org/10.1007/s11141-010-9219-7.

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Emig, K. L., P. Salas, F. de Gasperin, et al. "The first detection of radio recombination lines at cosmological distances." Astronomy & Astrophysics 622 (February 2019): A7. http://dx.doi.org/10.1051/0004-6361/201834052.

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Context. Recombination lines involving high principal quantum numbers (n ∼ 50 − 1000) populate the radio spectrum in large numbers. Low-frequency (< 1 GHz) observations of radio recombination lines (RRLs) primarily from carbon and hydrogen offer a new, if not unique, way to probe cold, largely atomic gas and warm, ionised gas in other galaxies. Furthermore, RRLs can be used to determine the physical state of the emitting regions, such as temperature and density. These properties make RRLs, potentially, a powerful tool of extragalactic interstellar medium (ISM) physics. At low radio frequenc

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Noman, Muhammad, Usman A. Haider, Hidayat Ullah, Farooq A. Tahir, Hatem Rmili, and Ali I. Najam. "A 32-Bit Single Quadrant Angle-Controlled Chipless Tag for Radio Frequency Identification Applications." Sensors 22, no. 7 (2022): 2492. http://dx.doi.org/10.3390/s22072492.

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A 32-bit chipless RFID tag operating in the 4.5–10.9 GHz band is presented in this paper. The tag has a unique multiple-arc-type shape consisting of closely packed 0.2 mm wide arcs of different radii and lengths. The specific tag geometry provides multiple resonances in frequency domain of an RCS plot. A frequency domain coding technique has also been proposed to encode the tag’s RCS signature into a 32-bit digital identification code. The tag has an overall dimension of 17.9 × 17.9 mm2, resulting in a high code density of 9.98 bits/cm2 and spectral efficiency of 5 bits/GHz. The proposed tag i

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Suryanto, Suryanto, and Yuli Kurnia Ningsih. "Overview of 5G services and spectrum deployment in urban regions." TEKNOSAINS : Jurnal Sains, Teknologi dan Informatika 11, no. 1 (2024): 91–102. http://dx.doi.org/10.37373/tekno.v11i1.651.

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The development of 2G, 3G, 4G, WiFi, and other advancements that provide greater reliability and coverage and are focused on high data rates and low latency has led to the development of 5G technology. We must, however, overcome a number of obstacles before we can deploy 5G in Indonesia, particularly in terms of choosing the appropriate frequency. This assessment can help in assessing and resolving issues with spectrum, infrastructure, and other technical factors while also helping to understand the demands and characteristics of urban areas and determine the best spectrum allocation to fulfil

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Иванов, Д. В., В. А. Иванов, А. А. Елсуков та Н. В. Рябова. "Методология и макет программно-конфигурируемой сиcтемы для низкоскоростной передачи информации по ионосферному радиоканалу с высокой надёжностью". Vestnik of Volga State University of Technology. Series Radio Engineering and Infocommunication Systems, № 3(59) (20 листопада 2023): 45–57. https://doi.org/10.25686/2306-2819.2023.3.45.

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Разработана методология низкоскоростной передачи информации по ионосферному радиоканалу при одновременном получении информации о его состоянии в результате использования сложного сигнала типа FMCW–FSK. Рассмотрены вопросы выбора параметров такого сигнала с учётом совмещения системы сенсорной диагностики ионосферного радиоканала и передачи информации. Разработан реализующий данную методологию макет программно-конфигурируемой радиосистемы передачи информации и проведена его апробация в лабораторных экспериментах при имитации ионосферного радиоканала многоотводной линией задержки. Introduction. F

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Lerkbangplad, Chawanat, Alongkorn Namahoot, Prayoot Akkaraekthalin, and Suramate Chalermwisutkul. "A compact wideband circularly polarized quadrifilar antenna with PIFA elements for UHF RFID readers." International Journal of Microwave and Wireless Technologies 12, no. 10 (2020): 1020–28. http://dx.doi.org/10.1017/s1759078720000276.

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AbstractIn this paper, a compact circularly polarized quadrifilar antenna with planar inverted-F antenna (PIFA) elements is presented. The proposed antenna consists of four PIFA elements and a Wilkinson divider-based feed network fabricated on FR-4 substrate (ɛr = 4.4, loss tangent = 0.02, thickness = 1.6 mm). The total size of the antenna is 120 × 120 × 13.2 mm3. Impedance matching with a reflection coefficient <−15 dB and an axial ratio (AR) <3 dB are achieved over the global ultra-high frequency (UHF) radio frequency identification (RFID) frequency band and beyond. The realized gain r

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He, Xiao-Ming, S.-T. Lee, I. Bello, et al. "Characterization and Optical Investigation of Diamondlike Carbon Prepared by Electron Cyclotron Resonance Plasma." Journal of Materials Research 14, no. 4 (1999): 1617–25. http://dx.doi.org/10.1557/jmr.1999.0217.

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Diamondlike carbon (DLC) films have been prepared on radio-frequency (rf) biased substrates maintained at low temperature (∼60 °C) using electron cyclotron resonance CH4 –Ar plasma. The structures of the resultant films were characterized by Fourier transform infrared (FTIR), Raman, and ultraviolet/visible (UV/VIS) spectrometry. The studies revealed that the deposited structures were DLC films with sp3/sp2 bond hybridization, extremely high hardness (>3000 kgf/mm2), and high electrical resistivity (up to 1014 Ω cm). The DLC films deposited on colorless (transparent) polymer plastics were ex

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Teitelbaum, Lawrence, Walid Majid, Manuel M. Franco, Daniel J. Hoppe, Shinji Horiuchi, and T. Joseph W. Lazio. "Precision Pulsar Timing with NASA's Deep Space Network." Proceedings of the International Astronomical Union 11, A29B (2015): 367–69. http://dx.doi.org/10.1017/s174392131600555x.

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AbstractMillisecond pulsars (MSPs) are a class of radio pulsars with extremely stable rotation. Their excellent timing stability can be used to study a wide variety of astrophysical phenomena. In particular, a large sample of these pulsars can be used to detect low-frequency gravitational waves. We have developed a precision pulsar timing backend for the NASA Deep Space Network (DSN), which will allow the use of short gaps in tracking schedules to time pulses from an ensemble of MSPs. The DSN operates clusters of large dish antennas (up to 70-m in diameter), located roughly equidistant around

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Li, Jingtao, Yang Liu, Wengang Pei, and Zhen Cao. "Behaviors of High-Frequency Subscribers in Cellular Data Networks." Security and Communication Networks 2018 (November 6, 2018): 1–12. http://dx.doi.org/10.1155/2018/2506319.

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Cellular networks operate under restrictive constraints of resources including radio channel capacity and network processing capability. The tremendous growth in the cellular data network usage brings operators with unprecedented signaling overloads and threatens the stability of the network. High-frequency subscribers, who produce low data volume but cause high signaling overhead, are extremely resource-inefficient. For subscribers who activate more than 5 sessions per hour, they only account for 1.19% of the total subscribers and generate about 3.81% data traffic but consume roughly 19.46% o

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Giglio, Jeffrey J., and Joseph A. Caruso. "Evaluation of Alternative Plasma Gases for Radio-Frequency Glow Discharge Mass Spectrometry (rf GD-MS)." Applied Spectroscopy 49, no. 7 (1995): 900–906. http://dx.doi.org/10.1366/0003702953964796.

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Interferences are a major consideration in all forms of plasma mass spectrometry. Investigations into the use of He, Ne, N2, and Kr in radio-frequence glow discharge mass spectrometry (rf GD-MS) have been undertaken to study their potential as alternative plasma gases. All gases exhibited expected behavior with respect to pressure and power. Background species are discussed for each gas, along with the effect of each gas on analyte intensities in Standard Reference Material (SRM) copper 500. A helium plasma yields the highest intensities for analytes (Cr, Fe, Ni, Co, Zn, As, Se, Ag, Au, Pb, an

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K, Santhosh, Sushil Kumar G. N, Umesh R. G, Suraksha M. S, and Dr Praveen Kumar K. V. "Radio Resource Allocation for 5g Network using Deep Reinforcement Learning." International Journal for Research in Applied Science and Engineering Technology 11, no. 5 (2023): 2031–39. http://dx.doi.org/10.22214/ijraset.2023.51522.

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Abstract: 5G is poised to support new emerging service types that help in the realization of futuristic applications. These services include enhanced Mobile BroadBand (eMBB), ultra-Reliable Low Latency Communication (uRLLC), and massive MachineType Communication (mMTC). 5G New Radio (NR) is envisioned to efficiently support ultra-reliable low-latency communication (URLLC) for new services and application with high reliability, availability and low latency such as factory automation and autonomous vehicles. 5G promises massive increases in traffic volume and data rates. Next generation wireless

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Aller, Daniel G., Diego G. Lamar, Juan Rodriguez, et al. "Adapting Techniques to Improve Efficiency in Radio Frequency Power Amplifiers for Visible Light Communications." Electronics 9, no. 1 (2020): 131. http://dx.doi.org/10.3390/electronics9010131.

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It is well known that modern wireless communications systems need linear, wide bandwidth, efficient Radio Frequency Power Amplifiers (RFPAs). However, conventional configurations of RFPAs based on Class A, Class B, and Class AB exhibit extremely low efficiencies when they manage signals with a high Peak-to-Average Power Ratio (PAPR). Traditionally, a number of techniques have been proposed either to achieve linearity in the case of efficient Switching-Mode RFPAs or to improve the efficiency of linear RFPAs. There are two categories in the application of aforementioned techniques. First, techni

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Kollár, Zsolt, Lajos Varga, Bálint Horváth, Péter Bakki, and János Bitó. "Evaluation of Clipping Based Iterative PAPR Reduction Techniques for FBMC Systems." Scientific World Journal 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/841680.

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This paper investigates filter bankmulticarrier (FBMC), a multicarrier modulation technique exhibiting an extremely low adjacent channel leakage ratio (ACLR) compared to conventional orthogonal frequency division multiplexing (OFDM) technique. The low ACLR of the transmitted FBMC signal makes it especially favorable in cognitive radio applications, where strict requirements are posed on out-of-band radiation. Large dynamic range resulting in high peak-to-average power ratio (PAPR) is characteristic of all sorts of multicarrier signals. The advantageous spectral properties of the high-PAPR FBMC

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Lin, Heng-Sheng, Chuan-Hsi Hung, Zong-Ying Wang, and Xing-Yonug Lo. "Evaluation of forming methods for a cup-part used in an ultra-miniatured radio-frequency connector." MATEC Web of Conferences 408 (2025): 01024. https://doi.org/10.1051/matecconf/202540801024.

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The signal-receiving contacts of ultra-miniature radio-frequency connectors are made of copper alloy sheets and stamped with progressive dies. However, the drawn cup corner often becomes extremely thin after progressive stamping, resulting in contact defects, insufficient mechanical strength, and reduced signal transmission quality. The present study investigates the effect of three forming methods, drawing with a blank holder, drawing without a blank holder, and drawing with a synchronous blank holder, on the corner-thinning phenomenon of the drawn cup by enlarging the scale of 10 for the wor

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Liu, Ze-Nan, Wei-Yang Wang, Yuan-Pei Yang, and Zi-Gao Dai. "The Statistical Polarization Properties of Coherent Curvature Radiation by Bunches: Application to Fast Radio Burst Repeaters." Astrophysical Journal 943, no. 1 (2023): 47. http://dx.doi.org/10.3847/1538-4357/acac23.

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Abstract Fast radio bursts (FRBs) are extragalactic radio transients with a millisecond duration and an extremely high brightness temperature. Very recently, some highly circularly polarized bursts were found in a repeater, FRB 20201124A. The significant circular polarization might be produced by coherent curvature radiation by bunches with the line of sight (LOS) deviating from the bunch central trajectories. In this work, we carry out simulations to study the statistical properties of burst polarization within the framework of coherent curvature radiation by charged bunches in the neutron st

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Greeshma yadav, Thotakura. "Radio Telescope Design for the Observation of 21 Cm Neutral Hydrogen Emission." INTERNATIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 09, no. 05 (2025): 1–9. https://doi.org/10.55041/ijsrem49255.

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Abstract - The detection of the global 21 cm hydrogen signal from the early Universe presents significant challenges due to the extremely faint nature of the signal compared to foreground emissions. This project focuses on the design and analysis of a radio antenna system developed for the REACH (Radio Experiment for the Analysis of Cosmic Hydrogen) initiative. By leveraging a quantitative, figure-of-merit-driven methodology, we explore how antenna geometry, impedance matching, and beam chromaticity affect the system's ability to distinguish the cosmological signal from foreground noise. Vario

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García-Minguillán López, Olga, Ana Jiménez Valbuena, and Ceferino Maestú Unturbe. "Significant Cellular Viability Dependence on Time Exposition at ELF-EMF and RF-EMF In Vitro Studies." International Journal of Environmental Research and Public Health 16, no. 12 (2019): 2085. http://dx.doi.org/10.3390/ijerph16122085.

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The human concern about the effect of electromagnetic fields (EMFs) has changed over time from the effects produced by EMFs of extremely low frequencies (ELFs) to the effects produced by exposure to a radio frequency (RF), with concerns shifting toward EMFs due to the development of new technologies and forms of communication. Previous studies have analysed the effects produced at different frequencies without considering in detail the effect of the time of exposure. Therefore, in the present study, we analysed in vitro the effect produced by a 100 µT EMF at different ELFs and exposure times i

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Ahmad, Sheikh Faisal, Young Cheol Kim, Ick Chang Choi, and Hyun Deok Kim. "Recent Progress in Birdcage RF Coil Technology for MRI System." Diagnostics 10, no. 12 (2020): 1017. http://dx.doi.org/10.3390/diagnostics10121017.

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The radio frequency (RF) coil is one of the key components of the magnetic resonance imaging (MRI) system. It has a significant impact on the performance of the nuclear magnetic resonance (NMR) detection. Among numerous practical designs of RF coils for NMR imaging, the birdcage RF coil is the most popular choice from low field to ultra-high field MRI systems. In the transmission mode, it can establish a strong and homogeneous transverse magnetic field B1 for any element at its Larmor frequency. Similarly, in the reception mode, it exhibits extremely high sensitivity for the detection of even

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Capetti, A., M. Brienza, R. D. Baldi, et al. "The LOFAR view of FR 0 radio galaxies." Astronomy & Astrophysics 642 (October 2020): A107. http://dx.doi.org/10.1051/0004-6361/202038671.

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We explore the low-frequency radio properties of the sources in the Fanaroff-Riley class 0 catalog (FR0CAT) as seen by the Low-Frequency ARray (LOFAR) observations at 150 MHz. This sample includes 104 compact radio active galactic nuclei (AGN) associated with nearby (z < 0.05) massive early-type galaxies. Sixty-six FR0CAT sources are in the sky regions observed by LOFAR and all of them are detected, usually showing point-like structures with sizes of ≲3–6 kpc. However, 12 FR 0s present resolved emission of low surface brightness, which contributes between 5% and 40% of the total radio power

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Возіяну, В.А. "КОМПЛЕКСНА МЕТОДОЛОГІЯ ПОБУДОВИ DMR-АРХІТЕКТУРИ НА ОСНОВІ РАДІОСИСТЕМИ SDR". Наукові записки Львівського університету бізнесу та права. Серія економічна. Серія юридична, № 34 (30 вересня 2022): 186–93. https://doi.org/10.5281/zenodo.7274330.

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To date, the definition of the principles of the implementation of the open standard of digital mobile radio communication (DMR: Digital Mobile Radio) as a highly effective and simple approach to the organization of radio systems, which at the same time is characterized by low cost, is considered as an extremely urgent task of scientific research. Compared to such widespread universal standards as iDEN and TETRA, the architecture based on DMR is characterized by a multiple higher bandwidth of the information channel, backward compatibility, a wide toolkit for organizing a radio station based o

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