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Artículos de revistas sobre el tema "Radio e regime"

Autor: Grafiati

Publicado: 10 de marzo de 2023

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1

Haugbølle, Rikke Hostrup. "Gamle og nye udtryk for islam i Tunesien: Regimerne og den islamiske Radio Zitouna". Tidsskrift for Islamforskning 7, n.º 1 (5 de febrero de 2017): 32. http://dx.doi.org/10.7146/tifo.v7i1.25311.

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In 2007 Tunisia’s first Islamic radio channel, Radio Zitouna, was launched. The year before, in 2006, a public expression of Islam by the population culminated when Ben Ali and his regime cracked down on women wearing the Islamic veil in public. Same year the regime caught an Islamist group planning an attack on strategic places and the president and therefore described by the regime as terrorists. With a point of departure in the theories presented by studies of the Arab authoritarian regimes it would be obvious to explain the launch of Radio Zitouna as a regime response to a threat against one of its power strongholds, Islam. However, this article widens the perspective of Radio Zitouna and includes other aspects than the relation between the radio station and the regime. Bases on analysis of a number of programmes broadcast from 2007 to 2009 and interviews with the staff at the radio station in 2009 and 2010 the article presents other contexts which do not only link to the current events in Tunisia but rather relates to a broader historical and political context.

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2

Krasner, Stephen D. "Global Communications and National Power: Life on the Pareto Frontier". World Politics 43, n.º 3 (abril de 1991): 336–66. http://dx.doi.org/10.2307/2010398.

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Regime analysis has focused on issues of market failure, the resolution of which depends upon knowledge and institution building. Global communications regimes, however, have been concerned either with issues of pure coordination or with coordination problems with distributional consequences. Outcomes have been decided by the underlying distribution of national power. In those areas where power was asymmetrically distributed and there was no agreement on basic principles and norms—radio broadcasting and remote sensing—no regime was formed. In those areas where distributional issues could not be unilaterally resolved—allocation of the radio spectrum and telecommunications—regimes were created, although both principles and rules changed with alterations in national power capabilities.

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3

Pistrick, Eckehard. "Listening to “The human without a soul” - outline for an audience-centred history of broadcasting in communist Albania". Muzikologija, n.º 21 (2016): 141–55. http://dx.doi.org/10.2298/muz1621141p.

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The paper proposes a study of broadcasting in one of the most tightly isolated regimes of the communist Eastern Bloc, beyond the paradigms of radio as a pure propaganda medium and of radio history as pure institutional history. Instead of a macro-history from above, this contribution proposes an ethnographically grounded micro-perspective alongside the lines of ?audience studies?, informed by ?oral history? methods. It proposes focusing on the social effects of radio listening and, in a broader perspective, on how radio broadcasting was embedded into larger modernization agendas of the regime of Enver Hoxha.

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4

Glikman, E., M. Lacy, S. LaMassa, C. Bradley, S. G. Djorgovski, T. Urrutia, E. L. Gates, M. J. Graham, M. Urry y I. Yoon. "The WISE-2MASS Survey: Red Quasars Into the Radio Quiet Regime". Astrophysical Journal 934, n.º 2 (29 de julio de 2022): 119. http://dx.doi.org/10.3847/1538-4357/ac6bee.

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Abstract We present a highly complete sample of broad-line (Type 1) QSOs out to z ∼ 3 selected by their mid-infrared colors, a method that is minimally affected by dust reddening. We remove host-galaxy emission from the spectra and fit for excess reddening in the residual QSOs, resulting in a Gaussian distribution of colors for unreddened (blue) QSOs, with a tail extending toward heavily reddened (red) QSOs, defined as having E(B − V) > 0.25. This radio-independent selection method enables us to compare red and blue QSO radio properties in both the FIRST (1.4 GHz) and VLASS (2–4 GHz) surveys. Consistent with recent results from optically selected QSOs from SDSS, we find that red QSOs have a significantly higher detection fraction and a higher fraction of compact radio morphologies at both frequencies. We employ radio stacking to investigate the median radio properties of the QSOs including those that are undetected in FIRST and VLASS, finding that red QSOs have significantly brighter radio emission and steeper radio spectral slopes compared with blue QSOs. Finally, we find that the incidence of red QSOs is strongly luminosity dependent, where red QSOs make up >40% of all QSOs at the highest luminosities. Overall, red QSOs comprise ∼40% of higher luminosity QSOs, dropping to only a few percent at lower luminosities. Furthermore, red QSOs make up a larger percentage of the radio-detected QSO population. We argue that dusty AGN-driven winds are responsible for both the obscuration as well as excess radio emission seen in red QSOs.

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5

Swinehart, Karl F. "Metadiscursive regime and register formation on Aymara radio". Language & Communication 32, n.º 2 (abril de 2012): 102–13. http://dx.doi.org/10.1016/j.langcom.2011.05.004.

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6

Saripalli, L., R. Subrahmanyan y R. W. Hunstead. "Morphologies in Mpc-Size Radio Galaxies". Symposium - International Astronomical Union 175 (1996): 313–14. http://dx.doi.org/10.1017/s0074180900080906.

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The extended radio structures or lobes found in edge-brightened radio galaxies represent interactions with the ambient medium over the source lifetimes. Their study probes the temporal evolution in the radio sources and the properties of the ambient medium encountered at different locations. Previous studies (Leahy & Williams, 1984; Leahy et al., 1989) involved radio galaxies with sizes ≃ 400 kpc, and revealed radio morphologies with a variety of off-axis distortions that could be interpreted as due to different ways in which the lobes interact with the galactic halos. Such studies are lacking for radio galaxies having Megaparsec sizes, which extend to distances well beyond the observed galactic halos and are suspected of evolving in a different regime (Baldwin, 1982). Towards learning the evolution of radio galaxies in this size regime, we have carried out a study of a complete sample of Mpc-size radio galaxies; details are presented in Subrahmanyan, Saripalli & Hunstead (to appear in MNRAS, 1996).

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7

Cho, Joan E., Jae Seung Lee y B. K. Song. "MEDIA EXPOSURE AND REGIME SUPPORT UNDER COMPETITIVE AUTHORITARIANISM: EVIDENCE FROM SOUTH KOREA". Journal of East Asian Studies 17, n.º 2 (9 de mayo de 2017): 145–66. http://dx.doi.org/10.1017/jea.2016.41.

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AbstractThis study explores whether and how exposure to mass media affects regime support in competitive authoritarian regimes. Using geographical and temporal variation in newspaper circulation and radio signal strength in South Korea under Park Chung Hee's competitive authoritarian rule (1961–1972), we find that greater exposure to media was correlated with more opposition to the authoritarian incumbent, but only when the government's control of the media was weaker. When state control of the media was stronger, the correlation between media exposure and regime support disappeared. Through a content analysis of newspaper articles, we also demonstrate that the regime's tighter media control is indeed associated with pro-regime bias in news coverage. These findings from the South Korean case suggest that the liberalizing effect of mass media in competitive authoritarian regimes is conditional on the extent of government control over the media.

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8

Pluzhnik, Victoria V. "RADIO VOICE AS REGIME OF INTERMEDIALITY IN SOVIET CULTURE". RSUH/RGGU Bulletin. "Literary Theory. Linguistics. Cultural Studies" Series, n.º 8 (2019): 149–60. http://dx.doi.org/10.28995/2686-7249-2019-8-149-160.

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9

Xiang, N. y F. L. Waelbroeck. "Collisional sheath dynamics in the intermediate radio-frequency regime". Journal of Applied Physics 95, n.º 3 (febrero de 2004): 860–69. http://dx.doi.org/10.1063/1.1640458.

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10

Wex, Norbert y Michael Kramer. "Gravity Tests with Radio Pulsars". Universe 6, n.º 9 (22 de septiembre de 2020): 156. http://dx.doi.org/10.3390/universe6090156.

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The discovery of the first binary pulsar in 1974 has opened up a completely new field of experimental gravity. In numerous important ways, pulsars have taken precision gravity tests quantitatively and qualitatively beyond the weak-field slow-motion regime of the Solar System. Apart from the first verification of the existence of gravitational waves, binary pulsars for the first time gave us the possibility to study the dynamics of strongly self-gravitating bodies with high precision. To date there are several radio pulsars known which can be utilized for precision tests of gravity. Depending on their orbital properties and the nature of their companion, these pulsars probe various different predictions of general relativity and its alternatives in the mildly relativistic strong-field regime. In many aspects, pulsar tests are complementary to other present and upcoming gravity experiments, like gravitational-wave observatories or the Event Horizon Telescope. This review gives an introduction to gravity tests with radio pulsars and its theoretical foundations, highlights some of the most important results, and gives a brief outlook into the future of this important field of experimental gravity.

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11

Gagliarducci, Stefano, Massimiliano Gaetano Onorato, Francesco Sobbrio y Guido Tabellini. "War of the Waves: Radio and Resistance during World War II". American Economic Journal: Applied Economics 12, n.º 4 (1 de octubre de 2020): 1–38. http://dx.doi.org/10.1257/app.20190410.

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We analyze the role of the media in coordinating and mobilizing insurgency against an authoritarian regime, in the context of the Nazi-fascist occupation of Italy during WWII. We study the effect of BBC radio on the intensity of internal resistance. By exploiting variations in monthly sunspot activity that affect the sky-wave propagation of BBC broadcasting toward Italy, we show that BBC radio had a strong impact on political violence. We provide further evidence to document that BBC radio played an important role in coordinating resistance activities but had no lasting role in motivating the population against the Nazi-fascist regime. (JEL D74, L82, N44)

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12

Кульминский, Д. Д., В. И. Пономаренко y М. Д. Прохоров. "Ламинарный хаос в генераторе с запаздывающей обратной связью". Письма в журнал технической физики 46, n.º 9 (2020): 16. http://dx.doi.org/10.21883/pjtf.2020.09.49366.18218.

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For the first time, the phenomenon of laminar chaos is experimentally studied in a radio engineering generator with time-delayed feedback, the delay time of which is modulated by an external harmonic signal. Regions of various regimes of laminar chaos are constructed on the plane of the parameters of modulating signal. The nonlinear function of generator is reconstructed in the regime of laminar chaos.

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13

d’Antonio, D., M. Giroletti, G. Giovannini y A. Maini. "Radio spectral properties of cores and extended regions in blazars in the MHz regime". Monthly Notices of the Royal Astronomical Society 490, n.º 4 (15 de noviembre de 2019): 5798–806. http://dx.doi.org/10.1093/mnras/stz2967.

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ABSTRACT Low-frequency radio surveys allow in-depth studies and new analyses of classes of sources that were previously known and characterized only in other bands. In recent years, low radio frequency observations of blazars have become available as a result of new surveys, such as the GaLactic and Extragalactic All-sky Murchison Widefield Array (MWA) survey (GLEAM). We search for gamma-ray blazars in a low-frequency (ν < 240 MHz) survey, to characterize the spectral properties of the spatial components. We cross-correlate GLEAM with the fourth catalogue of active galactic nuclei (4LAC) detected by the Fermi satellite. This improves on previous works by using a low-frequency catalogue that is wider and deeper, with a better spectral coverage and the latest and most sensitive gamma-ray source list. Compared with a previous study based on the commissioning survey, the detection rate increased from 35 to 70 per cent. We include data from the Australia Telescope 20-GHz (AT20G) survey in order to extract high-frequency high-angular resolution information about the radio cores of blazars. We find low radio frequency counterparts for 1274 out of 1827 blazars in the range of 72–231 MHz. Blazars have flat spectra at the ∼100-MHz regime, with a mean spectral index α = −0.44 ± 0.01 (assuming Sν ∝ να). Low synchrotron peaked objects have a flatter spectrum than high synchrotron peaked objects. Low frequency radio and gamma-ray emissions show a significant but scattered correlation. The ratio between lobe and core radio emission in gamma-ray blazars is smaller than previously estimated.

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14

Blok, F. J. y J. W. J. Verschuur. "A simplified six-port model in the radio frequency regime". Review of Scientific Instruments 71, n.º 9 (septiembre de 2000): 3552–58. http://dx.doi.org/10.1063/1.1287752.

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15

Alimov, V. A. y A. V. Rakhlin. "Phase Fluctuations of Radio Waves in the Saturated-Scintillation Regime". Radiophysics and Quantum Electronics 48, n.º 4 (abril de 2005): 247–53. http://dx.doi.org/10.1007/s11141-005-0065-y.

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16

Zafer, Zeynep. "The “Turkish Wing” of the Independent Society of Human Rights Protection". Balkanistic Forum 28, n.º 3 (16 de noviembre de 2019): 91–127. http://dx.doi.org/10.37708/bf.swu.v28i3.6.

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The paper relates in first person about the motivation, participants, organizing and enlarging the Turkish resistance movement against the assimilation actions of the Bulgarian communist regime from the 1980s. From the inside point of view are narrated the processes of the resistance of the Turks and Muslims against the attempts to change their names and violent Bulgarisation. In details are followed the actions concerning the voicing of the repressions of the regime against the Muslims, starving strikes as symbols of resistance, the participation of Turks in the Independent Society of Human Rights Protection and the establishment of „Turkish section“ to it.The paper relates about the role of the radio for the „voiceless“ minorities suffering from the repressions of the totalitarian regime. The importance of the Western radio stations as the only hope for penetration of news about the dissident movement in the socialist countries in the 1970s – 1980s has been outlined. The radio stations played also the role of coordinating centre for the resistance of the Turks and Muslims in Bulgaria during 1985-1989.

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17

Müller, Ralf R. "Soft Interference Cancellation for Random Coding in Massive Gaussian Multiple-Access". Entropy 23, n.º 5 (28 de abril de 2021): 539. http://dx.doi.org/10.3390/e23050539.

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In 2017, Polyanskiy showed that the trade-off between power and bandwidth efficiency for massive Gaussian random access is governed by two fundamentally different regimes: low power and high power. For both regimes, tight performance bounds were found by Zadik et al., in 2019. This work utilizes recent results on the exact block error probability of Gaussian random codes in additive white Gaussian noise to propose practical methods based on iterative soft decoding to closely approach these bounds. In the low power regime, this work finds that orthogonal random codes can be applied directly. In the high power regime, a more sophisticated effort is needed. This work shows that power-profile optimization by means of linear programming, as pioneered by Caire et al. in 2001, is a promising strategy to apply. The proposed combination of orthogonal random coding and iterative soft decoding even outperforms the existence bounds of Zadik et al. in the low power regime and is very close to the non-existence bounds for message lengths around 100 and above. Finally, the approach of power optimization by linear programming proposed for the high power regime is found to benefit from power imbalances due to fading which makes it even more attractive for typical mobile radio channels.

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18

Liu, Xiang, Ning Chang, Zhenhua Han y Xin Wang. "The Jet-Disk Coupling of Seyfert Galaxies from a Complete Hard X-ray Sample". Universe 6, n.º 5 (10 de mayo de 2020): 68. http://dx.doi.org/10.3390/universe6050068.

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We analyze the jet-disk coupling for different subsamples from a complete hard X-ray Seyfert sample to study the coupling indices and their relation to accretion rate. The results are: (1) the power-law coupling index ranges from nearly unity (linear correlation) for radio loud Seyferts to significantly less than unity for radio quiet ones. This decline trend of coupling index also holds from larger sources to compact ones; (2) the Seyferts with intermediate to high accretion rate (Eddington ratio λ ∼ 0.001 to 0.3) show a linear jet-disk coupling, but it shallows from near to super Eddington ( λ ∼ 0.3 to 10), and the former is more radio loud than the latter; (3) the Seyfert 1s are slightly steeper than the Seyfert 2s, in the jet-disk correlation. In the linear coupling regime, the ratio of jet efficiency to radiative efficiency ( η / ε ) is nearly invariant, but in low accretion or super accretion regime, η / ε varies with λ in our model. We note that a radio-active cycle of accretion-dominated active galactic nuclei would be: from a weaker jet-disk coupling in λ < 0 . 001 for low luminosity Seyferts, to a linear coupling in 0 . 001 < λ < 0 . 3 for radio-loud luminous Seyferts and powerful radio galaxies/quasars, and to a weaker coupling in 0 . 3 < λ < 10 ones.

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19

Vogler, Gisli. "The Ambiguity of Subversion". Theoria 67, n.º 165 (1 de diciembre de 2020): 65–91. http://dx.doi.org/10.3167/th.2020.6716504.

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This article explores subversion as a practice of resistance and draws on the example of subversive radio for illustration. Radio became an important site of power struggles in the twentieth century, often placed in the service of both resistance and oppression. An examination of subversive acts in radio broadcasting, I argue, helps shift the focus away from the myths of heroic resistance, directing attention to the uncertainties encountered by the subversive actor. To make this argument, I build on Frantz Fanon’s influential work on the resistant potential of radio and engage with literature on subversion and everyday resistance. The article illustrates the ambiguity of subversion on the case study of Radio Bantu, a broadcaster of ethnic-specific radio programmes established by the South African apartheid regime.

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20

Lindroos, L., K. K. Knudsen, F. Stanley, T. W. B. Muxlow, R. J. Beswick, J. Conway, J. F. Radcliffe y N. Wrigley. "Measuring size evolution of distant, faint galaxies in the radio regime". Monthly Notices of the Royal Astronomical Society 476, n.º 3 (19 de febrero de 2018): 3544–54. http://dx.doi.org/10.1093/mnras/sty426.

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21

Tulin, D. V., I. S. Vinogradov, A. F. Shabarchin, A. S. Privezentsev y K. A. Goncharov. "System of maintaining the thermal regime of a space radio telescope". Cosmic Research 52, n.º 5 (septiembre de 2014): 386–90. http://dx.doi.org/10.1134/s0010952514050098.

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22

Lesovoy, S. V., A. T. Treskov y T. A. Treskov. "Additive-correlation regime of operation of the siberian solar radio telescope". Radiophysics and Quantum Electronics 42, n.º 6 (junio de 1999): 445–50. http://dx.doi.org/10.1007/bf02677580.

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23

Fu, Y., X. Wang, B. Zheng, P. Zhang, Q. H. Fan y J. P. Verboncoeur. "On the scaling laws for low-temperature plasmas at macro and micro scales". Journal of Physics: Conference Series 2064, n.º 1 (1 de noviembre de 2021): 012037. http://dx.doi.org/10.1088/1742-6596/2064/1/012037.

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Abstract The theoretical background and historical development of the similarity theory during the past decades are reviewed. We demonstrate similar discharges in local and nonlocal kinetic regimes, taking the low-pressure capacitive radio frequency (rf) discharges and microdischarges as examples. By using fully kinetic particle-in-cell simulations, we verify the similarity law (SL) and show a violation of frequency scaling (f-scaling) in the low-pressure capacitive rf plasmas. The similarity relations for electron density and electron power absorption are confirmed in similar rf discharges. With only the driving frequency varied, the f-scaling for electron density is also validated, showing almost the same trend as the similarity scaling, across most of the frequency regime. However, violations of the f-scaling are observed at lower frequencies, which are found to be relevant to the electron heating mode transition from stochastic to Ohmic heating. The scaling characteristics have also been comprehensively studied for microdischarges with dimensions from hundreds to several microns, with transition from secondary electron dominated regime to field emission regime. Finally, practical applications of the similarity and scaling laws are summarized.

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24

Badenko, Vladimir, Alexandr Fedotov y Marina Bolsunovskaya. "Information system for seamless positioning inside of objects under construction". MATEC Web of Conferences 245 (2018): 10001. http://dx.doi.org/10.1051/matecconf/201824510001.

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Methods for seamless positioning of objects inside objects under construction to ensure the implementation of the principle “always and everywhere” and achieving centimetre positioning accuracy is proposed. The current state of work on the development of experimental samples of hardware and software complexes for seamless indoor and outdoor positioning of objects is presented. It is proposed to use radio-frequency technologies to solve the problem. The main methodological approaches and their first implementations are presented. The main feature of algorithms proposed is the implementation of a seamless transition when determining the position of the object in indoor and outdoor space with usage of an inertial system and radio-frequency positioning systems (in real time regime and without real time regime).

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25

Volwerk, Martin y Jan Kuijpers. "Strong Double Layers, Existence Criteria, and Annihilation: An Application to Solar Flares". International Astronomical Union Colloquium 142 (1994): 589–93. http://dx.doi.org/10.1017/s025292110007785x.

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AbstractWe present some conditions for the stability of a strong double layer in a warm, current-carrying plasma, which can be extended into the relativistic regime. We apply a model for plasma heating by the electron beam emitted from the double layer and show that this leads to a finite life time of the double layer. We also show that the radio emission accompanying this process can well describe the observed phenomena in Type I radio bursts using a direct emission mechanism, not involving Langmuir waves.Subject headings: plasmas — Sun: flares — Sun: radio radiation

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26

Vedantham, H. K. "On the mechanism of polarized metre-wave stellar emission". Monthly Notices of the Royal Astronomical Society 500, n.º 3 (2 de noviembre de 2020): 3898–907. http://dx.doi.org/10.1093/mnras/staa3373.

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ABSTRACT Two coherent radio emission mechanisms operate in stellar coronae: plasma emission and cyclotron emission. They directly probe the electron density and magnetic field strength respectively. Most stellar radio detections have been made at cm-wavelengths where it is often not possible to uniquely identify the emission mechanism, hindering the utility of radio observations in probing coronal conditions. In anticipation of stellar observations from a suite of sensitive low-frequency ($\nu \sim 10^2\, {\rm MHz}$) radio telescopes, here I apply the general theory of coherent emission in non-relativistic plasma to the low-frequency case. I consider the recently reported low-frequency emission from dMe flare stars AD Leo and UV Ceti and the quiescent star GJ 1151 as test cases. My main conclusion is that unlike the cm-wave regime, for reasonable turbulence saturation regimes, the emission mechanism in metre-wave observations ($\nu \sim 10^2\, {\rm MHz}$) can often be identified based on the observed brightness temperature, emission duration, and polarization fraction. I arrive at the following heuristic: M-dwarf emission that is ≳ hour-long with ${\gtrsim}50{{\ \rm per\ cent}}$ circular polarized fraction at brightness temperatures of ${\gtrsim}10^{12}\,$K at ${\sim}100\, {\rm MHz}$ in M-dwarfs strongly favours a cyclotron maser interpretation.

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27

Tenaglia, Camilla. "Il rumore delle onde". Quellen und Forschungen aus italienischen Archiven und Bibliotheken 101, n.º 1 (1 de noviembre de 2021): 58–86. http://dx.doi.org/10.1515/qufiab-2021-0005.

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Abstract This essay addresses the relations between Pius XII and Germany at the beginning of his pontificate through the role of Vatican Media, especially Vatican Radio. During the interwar period, the Vatican media system (media ensemble) underwent major transformations, including the creation of a radio broadcasting station in 1931. Pacelli was one of the main agents of these improvements: as Secretary of State supporting Guglielmo Marconi’s project, as Pope through his extensive use of the mass media at his disposal, from radio to cinema. At the end of the 30s the difficult diplomatic relations between the Holy See and the Third Reich also had an impact on mass media, as shown by the election of Pacelli in March 1939. The role of Vatican Radio in Vatican diplomacy towards Nazi Germany was already clear during the events surrounding the Anschluss in 1938 and it became a tool for unofficial communication to convey more explicit stances on the regime during World War II. The same strategy was employed during the Option in Südtirol in 1939, when Catholics were able to deliver anti-Nazi propaganda thanks in part to radio in the attempt to avoid the voluntary resettlement of German-speaking Italian citizens from the area. The Holy See maintained a neutral position throughout the events, but at the same time Vatican Radio broadcast programmes in German about the condition of the Catholic Church under the Nazi regime. These broadcasts supported the efforts especially of the Archbishop of Trento Celestino Endrici and his clergy, who opposed the resettlement. Once again Vatican Radio proved a crucial tool for conveying unofficial communications while maintaining the neutral stance typical of the Holy See‘s foreign policy.

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28

Radcliffe, Jack F., Robert J. Beswick, A. P. Thomson, Michael A. Garrett, Peter D. Barthel y Thomas W. B. Muxlow. "An insight into the extragalactic transient and variable microJy radio sky across multiple decades". Monthly Notices of the Royal Astronomical Society 490, n.º 3 (18 de octubre de 2019): 4024–39. http://dx.doi.org/10.1093/mnras/stz2748.

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ABSTRACT The mJy variable extragalactic radio sky is known to be broadly non-changing with approximately $3{{\ \rm per\ cent}}$ of persistent radio sources exhibiting variability that is largely active galactic nucleus-related (AGN). In the faint (<mJy) flux density regime, it is widely accepted that the radio source population begins to change from AGN dominated to star formation dominated, together with an emergent radio-quiet AGN component. Very little is known about the variable source component in this sub-mJy regime. In this paper, we provide the first insight into the μJy variable sky by performing a careful analysis using the deep VLA data in the well-studied GOODS-N field. Using five epochs spread across 22 yr, we investigate approximately 480 radio sources finding 10 that show signs of variability. We attribute this variability to the presence of an AGN in these systems. We confirm and extend the results of previous surveys, finding that variability in the faint radio sky is rather modest with only ≤2 per cent of sources exhibiting significant variability between any two epochs. We find that 70 per cent of variable sources show variability on time-scales of a few days while on longer decadal time-scales, the fraction of variable sources decreases to $\lt 1{{\ \rm per\ cent}}$. This suggests that the radio variability peaks on shorter time-scales as suggested by other studies. We find that 80 per cent of variable sources have VLBI counterparts, and we use multiwavelength data to infer that these may well be core-dominated FR-I sources as postulated by the wide-field VLBI surveys and semi-empirical simulations.

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29

Sun, Kai, Zi-dong Zhang, Run-hua Fan, Min Chen, Chuan-bing Cheng, Qing Hou, Xi-hua Zhang y Yao Liu. "Random copper/yttrium iron garnet composites with tunable negative electromagnetic parameters prepared by in situ synthesis". RSC Advances 5, n.º 75 (2015): 61155–60. http://dx.doi.org/10.1039/c5ra09882c.

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In this paper, the tunable negative permittivity and permeability of copper/yttrium iron garnet (Cu/YIG) composites, which were prepared by in situ synthesis process, were investigated in the radio frequency regime.

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30

Baldwin, J. E. "Is The Imaging Problem Identical in All Wave Bands?" Highlights of Astronomy 8 (1989): 549–50. http://dx.doi.org/10.1017/s1539299600008285.

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One aim of this meeting is to tempt us to study methods of imaging in wavebands outside our own. This might seem perverse since the imaging problems in the radio and optical/IR regions appear at first sight to differ profoundly in several ways: the rapid evolution of radio imaging over the last forty years has been largely ignored in optical imaging whilst the well developed theory and measurements of atmospheric fluctuations for the optical regime have been disregarded by radio astronomers; there have been long and exacting searches for the best sites for optical telescopes, but rarely for radio telescopes; the instrumental techniques appear to differ in many and complicated ways.

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31

ATTFIELD, NICHOLAS. "Music and Austrofascism: Radio, Pan-Germanism and the Reinvention of the Wiener Symphoniker". Journal of the Royal Musical Association 147, n.º 2 (noviembre de 2022): 417–48. http://dx.doi.org/10.1017/rma.2022.21.

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Abstract‘Austrofascist’ has again become an accepted term to describe the Austrian regime from 1933 to 1938. This article contributes to this re-emergence using the example of the Wiener Symphoniker, and by seeking long-term ‘fascistization’ processes surrounding the orchestra rather than blunt comparisons against developments in neighbouring regimes. The account hinges on the Austrian radio service (RAVAG), through which, during the economic crises of the 1920s, the state exerted alignment pressure on many cultural institutions. As Chancellor Dollfuss declared the ‘depoliticization’ of Austria (the banning of political parties) in 1933, RAVAG used its leverage to break the orchestra’s union alliances and dictate personnel selection according to politics. On this foundation, new radio series like Stunde österreichischer Komponisten der Gegenwart (‘Austrian Composers of the Present’) extolled ‘pan-Germanism’: a nationalist ideology that proclaimed the European supremacy of German Austrians and attempted to forge an Austrofascist community – even as it simultaneously created exploitable overlap with National Socialism.

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32

Shihab, M., A. T. Elgendy, I. Korolov, A. Derzsi, J. Schulze, D. Eremin, T. Mussenbrock, Z. Donkó y R. P. Brinkmann. "Kinetic simulation of the sheath dynamics in the intermediate radio frequency regime". Plasma Sources Science and Technology 22, n.º 5 (22 de agosto de 2013): 055013. http://dx.doi.org/10.1088/0963-0252/22/5/055013.

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33

Marchã, M. J. M., I. W. A. Browne, N. Jethava y S. Antón. "Unification in the low radio luminosity regime: evidence from optical line emission". Monthly Notices of the Royal Astronomical Society 361, n.º 2 (1 de agosto de 2005): 469–75. http://dx.doi.org/10.1111/j.1365-2966.2005.09180.x.

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34

Sotnikova, S. Yu, N. A. Kononova, L. B. Lander, V. E. Tsvetkov y S. V. Yalovnarov. "Influence of printed conductors on the thermal regime of radio-electronic devices". Izvestiâ vysših učebnyh zavedenij. Priborostroenie 65, n.º 10 (2 de noviembre de 2022): 712–24. http://dx.doi.org/10.17586/0021-3454-2022-65-10-712-724.

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35

Valtaoja, Esko. "Variability in the Millimeter and Radio Domains". Symposium - International Astronomical Union 159 (1994): 145–54. http://dx.doi.org/10.1017/s0074180900174935.

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The radio domain spans only a small fraction of the total electromagnetic spectrum, and is for most active galaxies energetically insignificant in comparison with higher frequencies. However, only in the radio regime can we obtain continuous fluxcurves and be certain that we are not missing anything. We also believe we know where the radiation comes from, and by which mechanisms it is produced. Furthermore, since VLBI generally cannot resolve the smallest core components, multifrequency continuum monitoring remains our only way to study the innermost radio cores of AGN. Finally, continuum monitoring is cheap (although time-consuming) in comparison with most other methods, and therefore we can observe many more sources and with far better time coverage.

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36

Ohanian, Gabriel A. "Different Types of Radio Sources and Possible Evolution of Radio Galaxies". International Astronomical Union Colloquium 184 (2002): 301–3. http://dx.doi.org/10.1017/s0252921100030906.

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Extragalactic radio sources have been studied for many years, but it is still unclear how they are formed and evolve. The sizes of the most powerful radio emitters in the Universe vary from less than one parsec to more than 1 Mpc. This large range of sizes has been interpreted as evidence for the evolution of the linear sizes of radio structure (e.g., O’Dea and Baum, 1997). A crucial element in the study of their evolution is the identification of the young compact counterparts of “old” FRI/FRII extended objects. Good candidates for young radio sources are those with peaked spectra (Gigahertz Peaked Spectrum - GPS and Compact Steep Spectrum - CSS, e.g., O’Dea 1998). Radio sources are presumably born in the very compact GPS phase, then they expand beyond 1 kpc into the CSS regime and finally, they reach a size of 20 kpc, and afterwards evolve into large-scale radio sources (young scenario, e.g., O’Dea 1998). Alternatively, GPS sources may be compact because a particularly dense environment prevents them from growing larger (old scenario, e.g., O’Dea 1998). In either scenario, the radio source host galaxy determines the time evolution of the radio structure. By studying the optical environments and host galaxies we hope to obtain clues to the evolution of the radio sources. Similarities or differences in host galaxy properties over a range of radio source types and sizes enable us to investigate possible differences or similarities of the radio size class as a whole.

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37

Björnsson, Helgi, Yngvar Gjessing, Svein-Erik Hamran, Jon Ove Hagen, Olav LiestøL, Finnur Pálsson y Björn Erlingsson. "The thermal regime of sub-polar glaciers mapped by multi-frequency radio-echo sounding". Journal of Glaciology 42, n.º 140 (1996): 23–32. http://dx.doi.org/10.1017/s0022143000030495.

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AbstractRadio-echo soundings provide an effective tool for mapping the thermal regimes of polythermal glaciers on a regional scale. Radar signals of 320–370 MHz penetrate ice at sub-freezing temperatures but are reflected from the top of layers of ice which are at the melting point and contain water. Radar signals of 5–20 MHz, on the other hand, see through both the cold and the temperate ice down to the glacier bed. Radio-echo soundings at these frequencies have been used to investigate the thermal regimes of four polythermal glaciers in Svalbard: Kongsvegen, Uvérsbreen, Midre Lovénbreen and Austre Brøggerbreen. In the ablation area of Kongsvegen, a cold surface layer (50–160 m thick) was underlain by a warm basal layer which is advected from the temperate accumulation area. The surface ablation of this cold layer may be compensated by freezing at its lower cold-temperate interface. This requires that the free water content in the ice at the freezing interface is about 1 % of the volume. The cold surface layer is thicker beneath medial moraines and where cold-based hanging glaciers enter the main ice stream. On Uvérsbreen the thermal regime was similar to that of Kongsvegen. A temperate hole was found in the otherwise cold surface layer of the ablation area in a surface depression between Kongsvegen and Uvérsbreen where meltwater accumulates during the summer (near the subglacial lake Setevatnet, 250 m a.s.l.). Lovénbreen w as frozen to the bed at the snout and along all the mountain slopes but beneath the central part of the glacier a warm basal layer (up to 50 m thick) was fed by temperate ice from two cirques. On Austre Brøggerbreen, a temperate basal layer was not detected by radio-echo soundings but the basal ice was observed to be at the melting point in two boreholes.

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38

Björnsson, Helgi, Yngvar Gjessing, Svein-Erik Hamran, Jon Ove Hagen, Olav LiestøL, Finnur Pálsson y Björn Erlingsson. "The thermal regime of sub-polar glaciers mapped by multi-frequency radio-echo sounding". Journal of Glaciology 42, n.º 140 (1996): 23–32. http://dx.doi.org/10.3189/s0022143000030495.

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AbstractRadio-echo soundings provide an effective tool for mapping the thermal regimes of polythermal glaciers on a regional scale. Radar signals of 320–370 MHz penetrate ice at sub-freezing temperatures but are reflected from the top of layers of ice which are at the melting point and contain water. Radar signals of 5–20 MHz, on the other hand, see through both the cold and the temperate ice down to the glacier bed. Radio-echo soundings at these frequencies have been used to investigate the thermal regimes of four polythermal glaciers in Svalbard: Kongsvegen, Uvérsbreen, Midre Lovénbreen and Austre Brøggerbreen. In the ablation area of Kongsvegen, a cold surface layer (50–160 m thick) was underlain by a warm basal layer which is advected from the temperate accumulation area. The surface ablation of this cold layer may be compensated by freezing at its lower cold-temperate interface. This requires that the free water content in the ice at the freezing interface is about 1 % of the volume. The cold surface layer is thicker beneath medial moraines and where cold-based hanging glaciers enter the main ice stream. On Uvérsbreen the thermal regime was similar to that of Kongsvegen. A temperate hole was found in the otherwise cold surface layer of the ablation area in a surface depression between Kongsvegen and Uvérsbreen where meltwater accumulates during the summer (near the subglacial lake Setevatnet, 250 m a.s.l.). Lovénbreen w as frozen to the bed at the snout and along all the mountain slopes but beneath the central part of the glacier a warm basal layer (up to 50 m thick) was fed by temperate ice from two cirques. On Austre Brøggerbreen, a temperate basal layer was not detected by radio-echo soundings but the basal ice was observed to be at the melting point in two boreholes.

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39

Dole, H., H. Sol y L. Vicente. "Comparative Study of Extragalactic Radio Sources from “Double Jet” models". Symposium - International Astronomical Union 175 (1996): 475–76. http://dx.doi.org/10.1017/s0074180900081547.

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It seems now important to consider bulk velocity gradients inside jets (Blandford, 1993; Biretta et al, 1995) and recent results from tomography technique suggest the presence of different components in radio sources (Rudnick, this symposium). A few jet models take explicitly into account two components with different bulk velocities (Smith, Raine, 1985; Baker et al, 1988; Sol et al, 1989; Achatz et al, 1990). A fast beam comes from the vicinity of the black hole while a slower collimated wind is emitted by the accretion disk. When stable, the two components can survive along the jet. If a fast instability develops at a distance Dc from core, the beam is destroyed over some relaxation length. Its energy and momentum are transmitted to the wind. Apparent change in the flow regime such as slowing down, decollimation, local bending or discontinuity in surface brightness is the expected observational signature of such critical zones on radio maps. The exact appearance of the zone depends on the parameters of the two flows and on their interaction regime.

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40

Walyemera, Daniel Masumba. "Regulator or controller: a five-year analysis of the cat and mouse games between the Uganda Communications Commission and broadcasters in Uganda". Law, Democracy and Development 25 (28 de enero de 2021): 1–28. http://dx.doi.org/10.17159/2077-4907/2021/ldd.v25.22.

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This article examines the conduct of the broadcasting regulator in Uganda. It considers whether the law governing the Uganda Communications Commission is in tandem with international human rights standards. This is in specific regard to media freedoms and other associated human rights. The major conclusion is that Uganda's broadcasting regime is ambiguous and is used as a tool to facilitate partisan political interests. As a consequence, the said regime does not meet international human rights standards. The article recommends reform of the legal regime, including the operationalisation of the Uganda Communications Tribunal to curb the arbitrary directives of the Uganda Communications Commission to radio, television and online broadcasters in Uganda.

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41

Groth, Alexander J. "East and West: Travel and communication under alternate regimes; a research note". Communist and Post-Communist Studies 39, n.º 1 (1 de marzo de 2006): 121–33. http://dx.doi.org/10.1016/j.postcomstud.2005.09.007.

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Using information supplied to international agencies, communication and transportation patterns of Communist and Post-Communist European states are compared with those of non-communist Europe. East European states under Communist rule tended to emphasize public—more easily “scripted,” observed and controlled media and conveyances—over private ones. This emphasis was substantially grounded in obsessive political security concerns among communist regimes. The performance of Post-Communist states indicates a significant shift toward the patterns of non-communist Western Europe and coincides with political regime changes moving East Europe closer to the pluralist West. Diffusion of cars, telephones, railroad traffic, radio, television, newspapers and cinema are analyzed.

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42

Mooney, S., J. Quinn, J. R. Callingham, R. Morganti, K. Duncan, L. K. Morabito, P. N. Best et al. "Blazars in the LOFAR Two-Metre Sky Survey first data release". Astronomy & Astrophysics 622 (febrero de 2019): A14. http://dx.doi.org/10.1051/0004-6361/201833937.

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Historically, the blazar population has been poorly understood at low frequencies because survey sensitivity and angular resolution limitations have made it difficult to identify megahertz counterparts. We used the LOFAR Two-Metre Sky Survey (LoTSS) first data release value-added catalogue (LDR1) to study blazars in the low-frequency regime with unprecedented sensitivity and resolution. We identified radio counterparts to all 98 known sources from the Third Fermi-LAT Point Source Catalogue (3FGL) or Roma-BZCAT Multi-frequency Catalogue of Blazars (5th edition) that fall within the LDR1 footprint. Only the 3FGL unidentified γ-ray sources (UGS) could not be firmly associated with an LDR1 source; this was due to source confusion. We examined the redshift and radio luminosity distributions of our sample, finding flat-spectrum radio quasars (FSRQs) to be more distant and more luminous than BL Lacertae objects (BL Lacs) on average. Blazars are known to have flat spectra in the gigahertz regime but we found this to extend down to 144 MHz, where the radio spectral index, α, of our sample is −0.17 ± 0.14. For BL Lacs, α = −0.13 ± 0.16 and for FSRQs, α = −0.15 ± 0.17. We also investigated the radio-to-γ-ray connection for the 30 γ-ray-detected sources in our sample. We find Pearson’s correlation coefficient is 0.45 (p = 0.069). This tentative correlation and the flatness of the spectral index suggest that the beamed core emission contributes to the low-frequency flux density. We compare our sample distribution with that of the full LDR1 on colour-colour diagrams, and we use this information to identify possible radio counterparts to two of the four UGS within the LDR1 field. We will refine our results as LoTSS continues.

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43

Bordo, V. G. "Self-excitation of radio waves in the metal–insulator–metal structure doped with metal nanowires". Journal of Applied Physics 133, n.º 1 (7 de enero de 2023): 014301. http://dx.doi.org/10.1063/5.0127049.

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The effect of self-excitation of radio waves in the metal–insulator–metal structure doped with metal nanowires is predicted and its theory is developed. Both the transient stage of self-excitation and the steady-state regime of self-oscillation are analyzed in a fully analytical form. The numerical estimates demonstrate that this effect can be used for diverse practical purposes, in particular, for radio frequency wireless power harvesting. These findings extend the approach developed in nano-optics to the field of electrical engineering.

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44

Wagner, Stefan J. "Multi-Frequency Studies of Intrinsic Intraday Variability". International Astronomical Union Colloquium 182 (2001): 105–11. http://dx.doi.org/10.1017/s0252921100000798.

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AbstractIntraday variability is detected in Blazars throughout the electromagnetic spectrum. Only radio emission is affected by interstellar scintillation. The characteristics of variability observed at different frequencies are often similar and suggest that intrinsic variations also contribute to the changes detected in the radio wavelength regime. This in turn implies very high brightness temperatures.Unambiguous signatures of scintillation and of intrinsic changes have been identified. The properties of intrinsic variations are reviewed to illustrate their potential contribution to variability in the radio domain. Such intrinsic changes need to be discriminated against when studying scintillation in quasars and BL Lac objects. Observations of scintillating sources and of sources with significant intrinsic IDV suggest interesting modifications to the standard paradigm of AGN.

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45

Adena, Maja, Ruben Enikolopov, Maria Petrova, Veronica Santarosa y Ekaterina Zhuravskaya. "Radio and the Rise of The Nazis in Prewar Germany *". Quarterly Journal of Economics 130, n.º 4 (15 de julio de 2015): 1885–939. http://dx.doi.org/10.1093/qje/qjv030.

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Abstract How do the media affect public support for democratic institutions in a fragile democracy? What role do they play in a dictatorial regime? We study these questions in the context of Germany of the 1920s and 1930s. During the democratic period, when the Weimar government introduced progovernment political news, the growth of Nazi popularity slowed down in areas with access to radio. This effect was reversed during the campaign for the last competitive election as a result of the pro-Nazi radio broadcast following Hitler’s appointment as chancellor. During the consolidation of dictatorship, radio propaganda helped the Nazis enroll new party members. After the Nazis established their rule, radio propaganda incited anti-Semitic acts and denunciations of Jews to authorities by ordinary citizens. The effect of anti-Semitic propaganda varied depending on the listeners’ predispositions toward the message. Nazi radio was most effective in places where anti-Semitism was historically high and had a negative effect in places with historically low anti-Semitism.

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46

De Buizer, James M. "The relationship between masers and massive star formation: what can be learned from the infrared?" Symposium - International Astronomical Union 206 (2002): 18–21. http://dx.doi.org/10.1017/s0074180900221980.

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The infrared represents an alternative wavelength regime in which to study the environments of maser emission, while at the same time complementing the information obtained through radio techniques. The near infrared (1–2 μm) yields information on outflows, shocks, and reflected dust emission, while the thermal infrared (3–30 μm) yields information on the thermal dust distribution around stars. Thus, the infrared regime yields important clues in determining whether masers exist in shocks, outflows, circumstellar accretion disks, or in the dense medium close to protostars.

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47

Xie, Fu-Guo. "Radiative efficiency of hot accretion flow and the radio/X-ray correlation in X-ray binaries". Proceedings of the International Astronomical Union 10, S312 (agosto de 2014): 139–40. http://dx.doi.org/10.1017/s1743921315007723.

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AbstractSignificant progresses have been made since the discovery of hot accretion flow, a theory successfully applied to the low-luminosity active galactic nuclei (LLAGNs) and black hole (BH) X-ray binaries (BHBs) in their hard states. Motivated by these updates, we re-investigate the radiative efficiency of hot accretion flow. We find that, the brightest regime of hot accretion flow shows a distinctive property, i.e. it has a constant efficiency independent of accretion rates, similar to the standard thin disk. For less bright regime, the efficiency has a steep positive correlation with the accretion rate, while for faint regime typical of advection-dominated accretion flow, the correlation is shadower. This result can naturally explain the observed two distinctive correlations between radio and X-ray luminosities in black hole X-ray binaries. The key difference in systems with distinctive correlations could be the viscous parameter, which determines the critical luminosity of different accretion modes.

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48

JAIN, AKHILESH, D. K. SHARMA, A. K. GUPTA, P. R. HANNURKAR y S. K. PATHAK. "Compact solid state radio frequency amplifiers in kW regime for particle accelerator subsystems". Sadhana 38, n.º 4 (agosto de 2013): 667–78. http://dx.doi.org/10.1007/s12046-013-0154-0.

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49

Ehst, D. A. y K. Evans. "Multiple wave radio frequency current driven tokamak reactors in the first stability regime". Nuclear Fusion 27, n.º 8 (1 de agosto de 1987): 1267–81. http://dx.doi.org/10.1088/0029-5515/27/8/008.

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50

Blanco Fajardo, Sergio. "Broadcasting the ‘Spanish Woman’. Nationalism and Female Radio Programmes During the Franco Regime". TMG Journal for Media History 22, n.º 2 (19 de diciembre de 2019): 61. http://dx.doi.org/10.18146/tmg.598.

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