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Автор: Grafiati
Опубліковано: 27 липня 2024
Оновлено: 28 липня 2024

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Статті в журналах з теми "Radio waves (Theory)"

1

Apple, Jacki, Regine Beyer, and Richard Kostelanetz. "Making Radio Waves." TDR (1988-) 36, no. 2 (1992): 7. http://dx.doi.org/10.2307/1146189.

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2

Jones, W., and J. Jones. "Oblique scattering of radio waves from meteor trains: Theory." Planetary and Space Science 38, no. 1 (January 1990): 55–66. http://dx.doi.org/10.1016/0032-0633(90)90005-b.

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3

Gordon, W. E. "The Propagation of Radio Waves: The Theory of Radio Waves of Low Power in the Ionosphere and Magnetosphere." Eos, Transactions American Geophysical Union 68, no. 12 (1987): 164. http://dx.doi.org/10.1029/eo068i012p00164-03.

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4

Rycroft, M. J. "The Propagation of Radio Waves: the Theory of Radio Waves of Low Power in the Ionosphere and Magnetosphere." Physics of the Earth and Planetary Interiors 43, no. 3 (September 1986): 255–57. http://dx.doi.org/10.1016/0031-9201(86)90054-3.

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5

Heading, J. "The Propagation of Radio Waves—The Theory of Radio Waves of Low Power in the Ionosphere and Magnetosphere." Journal of Atmospheric and Terrestrial Physics 48, no. 4 (April 1986): 415–16. http://dx.doi.org/10.1016/0021-9169(86)90009-7.

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6

Yeang, Chen-Pang. "From Mechanical Objectivity to Instrumentalizing Theory: Inventing Radio Ionospheric Sounders." Historical Studies in the Natural Sciences 42, no. 3 (June 1, 2012): 190–234. http://dx.doi.org/10.1525/hsns.2012.42.3.190.

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While the discovery of the ionosphere through wireless communications technology in the mid-1920s had built a close connection between atmospheric science and radio, the full-fledged use of radio waves as a geophysical probe did not start until an instrumental development occurred a few years later. This article examines this advance, which centered on the invention of radio sounders of the ionosphere. Like the earlier radio experiments on the ionosphere, the sounders bounced radio waves off the upper atmosphere and inferred its properties from the returns. But the new apparatuses contained valuable innovations. In the 1930s, researchers at American Telephone and Telegraph Company (AT&T), Britain's Radio Research Board (RRB), the Technical University of Munich, and the U.S. National Bureau of Standards (NBS) automated data recording with oscilloscopic displays and inscription gadgets. They also devised control mechanisms to synchronize the acquisition of data with the change of transmitting signals. On the one hand, such automation was consistent with Lorraine Daston and Peter Galison's "mechanical objectivity," which minimizes human interference, makes experiments repeatable, and reduces personal equations, most notably perhaps with the Bureau of Standards' automatic single-frequency sounder. On the other hand, however, the automation also embodied mechanically theory-laden experimental procedures—it instrumentalized a theory that underlay the experimental scheme. The British and Americans' sweep-frequency recorder reckoned precisely the mandate of the magneto-ionic theory, the dominant model of radio-wave propagation. The sweep-frequency recorder incorporated the magneto-ionic theory by producing an easy-to-measure critical condition that the theory had predicted.
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7

Cairns, Iver H., P. A. Robinson, and G. P. Zank. "Progress on Coronal, Interplanetary, Foreshock, and Outer Heliospheric Radio Emissions." Publications of the Astronomical Society of Australia 17, no. 1 (2000): 22–34. http://dx.doi.org/10.1071/as00022.

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AbstractType II and III solar radio bursts are associated with shock waves and streams of energetic electrons, respectively, which drive plasma waves and radio emission at multiples of the electron plasma frequency as they move out from the corona into the interplanetary medium. Analogous plasma waves and radiation are observed from the foreshock region upstream of Earth's bow shock. In situ spacecraft observations in the solar wind have enabled major progress to be made in developing quantitative theories for these phenomena that are consistent with available data. Similar processes are believed responsible for radio emissions at 2–3 kHz that originate in the distant heliosphere, from where the solar wind interacts with the local interstellar medium. The primary goal of this paper is to review the observations and theories for these four classes of emissions, focusing on recent progress in developing detailed theories for the plasma waves and radiation in the source regions. The secondary goal is to introduce and review stochastic growth theory, a recent theory which appears quantitatively able to explain the wave observations in type III bursts and Earth's foreshock and is a natural theory to apply to type II bursts, the outer heliospheric emissions, and perhaps astrophysicalemissions.
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8

Canobbio, E., and R. Croci. "Space-dependent quasi-linear theory of lower-hybrid waves." Journal of Plasma Physics 46, no. 2 (October 1991): 347–64. http://dx.doi.org/10.1017/s0022377800016160.

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The quasi-linear diffusion coefficients for the inherently space-dependent wave amplitudes in lower-hybrid heating and current-drive experiments are derived and compared with the usual space-independent approximation. The distribution function is derived and the dependence on the radio-frequency field amplitude gradient of the ‘plateau’, which is an essential quantity in thetheoretical description of LH experiments, is stressed.
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9

Wilkie, Bill. "The Daintree Blockade: Making (radio) waves." Queensland Review 28, no. 2 (December 2021): 166–68. http://dx.doi.org/10.1017/qre.2022.13.

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Radio log 11/8/84D5 crossing creek under Timbertop’s tree … continues to fill the creek crossing … If he continues to fill it high enough the D10 should go through. Looks like a moonscape where the dozers are working.
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10

Schutz, Bernard F. "Astrometric and timing effects of gravitational waves." Proceedings of the International Astronomical Union 5, S261 (April 2009): 234–39. http://dx.doi.org/10.1017/s1743921309990457.

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AbstractGravitational wave detection can be done by precision timing of millisecond pulsars, and (with less likelihood) by precision astrometry on distant objects whose light or radio waves pass through gravitational waves on their way to our observatories. Underlying both of these is the relatively simple theory of light propagation in spacetimes with gravitational waves, which is also the basis of interferometric gravitational wave detectors. I review this theory and apply it to the timing and astrometric methods of detection. While pulsar timing might even be the first way that we directly detect gravitational waves, light deflection by gravitational waves seems out of reach.
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Дисертації з теми "Radio waves (Theory)"

1

Weidt, Sebastian. "Towards microwave based ion trap quantum technology." Thesis, University of Sussex, 2014. http://sro.sussex.ac.uk/id/eprint/48893/.

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Scalability is a challenging yet key aspect required for large scale quantum computing and simulation using ions trapped in radio-frequency (rf) Paul traps. In this thesis 171Yb+ ions are used to demonstrate a magnetic field insensitive qubit which has a measured coherence time of 1.5 s, making it an ideal candidate to use for storing quantum information. A magnetic field sensitive qubit is also characterised which can be used for the implementation of multi-qubit gates using a potentially very scalable scheme based on microwaves in conjunction with a static magnetic field gradient instead of using lasers. However, the measured coherence time is limited by magnetic field fluctuations and will prohibit high fidelity gate operations from being performed. To address this issue, the preparation of a dressed-state qubit using a microwave based stimulated rapid adiabatic passage (STIRAP) pulse sequence will be presented. This qubit is protected against the noisy environment making it less sensitive to magnetic field fluctuations. The lifetime of this qubit is measured to demonstrate its suitability for storing quantum information. A powerful method for manipulating the dressed-state qubit will be presented and is used to measure a coherence time of the qubit of 500 ms which is two orders of magnitude longer compared to the magnetic field sensitive qubit. It will also be shown that our method allows for the implementation of arbitrary rotations of the dressed-state qubit on the Bloch sphere using only a single rf field. This substantially simplifies the experimental setup for single and multi-qubit gates. Furthermore, this thesis will present a experimental setup capable of successfully operating microfabricated surface ion traps. This setup is then used to operate and characterise the first two-dimensional (2D) lattice of ion traps on a microchip. A unique feature of the microfabrication technique used for this device is the extremely large voltage that can be applied which allows long ion lifetimes along with large secular frequencies to be measured, demonstrating the robustness of this device. Rudimentary shuttling between neighbouring lattice sites will be shown which could be used as part of a efficient scheme to load a large lattice of ions. One of the many applications of a 2D lattice of ions lies in the field of quantum simulations where many-body systems such as quantum magnetism, high temperature superconductivity, the fractional quantum hall effect and synthetic gauge fields can be simulated. It will be shown how making only minor modifications to the microchip the ion-ion separation can be reduced sufficiently to offer an exciting platform for the successful implementation of 2D quantum simulations. A theoretical investigation on the optimal 2D ion trap lattice geometry will also be presented with the aim to maximise the ratio of ion-ion coupling strength to decoherence from motional heating of the ions and to laser induced off-resonant coupling.
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2

Seguin, Sarah Ann. "Detection of low cost radio frequency receivers based on their unintended electromagnetic emissions and an active stimulation." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Seguin_09007dcc80708216.pdf.

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Thesis (Ph. D.)--Missouri University of Science and Technology, 2009.
Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed November 23, 2009) Includes bibliographical references.
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3

Pham, Edward Carleton University Dissertation Engineering Electrical. "SER prediction for transmission of PSAM 16-QAM in frequency selective fading channels." Ottawa, 1992.

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4

Karlsson, Roger. "Theory and Applications of Tri-Axial Electromagnetic Field Measurements." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5916.

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5

Gordon, Matthew D. "A uniform theory of diffraction approach to determine endfire glide slope performance in the presence of ground plane irregularities." Ohio : Ohio University, 1994. http://www.ohiolink.edu/etd/view.cgi?ohiou1176926845.

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6

Rushton, Elliott C. "Predicting the effects of shadowing and scattering from planar surfaces on localizer course structure using geometrical optics and the uniform theory of diffraction as implemented in the near zone basic scattering code." Ohio : Ohio University, 1994. http://www.ohiolink.edu/etd/view.cgi?ohiou1178731752.

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7

Cui, Huajian. "Extraction of input parameters for the theory of radiative energy transfer using deconvolution." Thesis, University of South Wales, 2009. https://pure.southwales.ac.uk/en/studentthesis/extraction-of-input-parameters-for-the-theory-of-radiative-energy-transfer-using-deconvolution(4eb05b79-5ef1-4a06-8cba-471d9fb82431).html.

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The ever growing application of wireless communication systems requires accurate models for characterising radiowave propagation when affected by the presence of a variety of obstacles. In particular if the obstacles take the shape of vegetation volumes, like single trees or groups of trees and are present in the radio path, they give rise to absorption and scattering of radio signals. This thesis presents a literature review of common models for radiowave propagation through vegetation, the theory of Radiative Energy Transfer (RET) is one of these models and provides an accurate analysis of radiowave propagation through a vegetation media. Extensive measurements have been designed and conducted in a controlled indoor environment to provide valuable measurement data for later development of deconvolution approaches. It can be shown that the measured directional spectra are convolution products of the phase function pattern and the receiver antenna radiation patterns, which impacts determination of the RET input parameters. Consequently, in order to achieve more accurate determination of the RET input parameters, the adverse influence caused by receiver antenna radiation patterns have to be removed from measured directional spectra by implementing a process of deconvolution. This thesis provides successful implementation of two iterative based deconvolution techniques on the measurement directional spectra. To the author's knowledge, this is its first kind of application to eliminate distortion caused by the receiver antenna radiation pattern during measurements. This thesis reports a number of novel approaches. These include the further development and extension of deconvolution techniques such as combining the Bennia-Riad criterion and an error function to determine optimal parameters, as well as using pre-filtering techniques to improve the deconvolution results. Development of clearly defined criteria based on the knowledge of the central-limit theorem and discussion of loss of information avoidance during convolution is another novel contribution. Further novelty lies in the modification of the two methods to suit implementation on the measurement data from radiowaves impacting on vegetation volumes. As a result of these refinements, extracted RET input parameters from the restored patterns after applying the deconvolution processes show evident improvements compared to those extracted from directly measured patterns. Early stage results of this project are published in the IEEE Proceedings on Next Generation Applications, Services and Technologies.
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8

Enjamio, Cabado Cristina. "Dynamic microscale rain structures and their application to millimetre wave radio communication systems." Thesis, University of Portsmouth, 2006. https://researchportal.port.ac.uk/portal/en/theses/dynamic-microscale-rain-structures-and-their-application-to-millimetre-wave-radio-communication-systems(b3d41210-0c79-4a3e-8d91-f4d1d6f5f8de).html.

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9

Aloi, Daniel Nicholas. "Development and verification of a mathematical model to investigate the effects of earth-surface-based multipath reflections at a differential global positioning system ground reference site." Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1175264170.

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Mehrotra, Prateek. "High Aspect Ratio Lithographic Imaging at Ultra-high Numerical Apertures: Evanescent Interference Lithography with Resonant Reflector Underlayers." Thesis, University of Canterbury. Electrical and Computer Engineering, 2012. http://hdl.handle.net/10092/6935.

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A near-field technique known as evanescent interferometric lithography allows for high resolution imaging. However its primary limitation is that the image exponentially decays within the photoresist due to physical limits. This thesis aims to overcome this limitation and presents a method to considerably enhance the depth of focus of images created using evanescent interferometric lithography by using a material underlay beneath the photoresist. A key enabler of this is the understanding that evanescent fields couple to surface states and operating within proximity of a resonance, the strength of the coupling allows for considerable energy extraction from the incident beam and redistribution of this energy in a photoresist cavity. This led to the analysis of the Fresnel equations, which suggested that such coupling was in fact the result of an enhanced reflectance that takes place at boundaries of carefully chosen materials. While it is known that metals and lossy dielectrics result in surface plasmon polaritons (SPP) and surface exciton polaritons (SEP) as conventional solutions to the Fresnel reflection equations for the TM polarization of light, there is no such naturally occurring surface state that allows evanescent wave enhancement with the TE polarization of light. Further investigation of the Fresnel reflection equations revealed both for TM and TE that in fact another solution exists that is but unconventional to enhance the reflectivity. This solution requires that one of the media have a negative loss. This is a new type of surface resonance that requires that one of the media be a gain medium; not one in the optical pumped sense but one that would naturally supply energy to a wave to make it grow. This new surface resonance is also a key result of this thesis. Clearly, however this is only a hypothetical solution as a real gain medium would violate the conservation of energy. However, as it is only the reflectance of this gain medium that is useful for evanescent wave enhancement, in fact a multilayered stack consisting of naturally occurring materials is one way to achieve the desired reflectivity. This would of course be only an emulation of the reflectivity aspect of the gain medium. This multilayered stack is then an effective gain medium for the reflectivity purposes when imaging is carried out at a particular NA at a particular wavelength. This proposal is also a key idea of this thesis. At λ = 193 nm, this method was used to propose a feasible design to image high resolution structures, NA = 1.85 at an aspect ratio of ~3.2. To experimentally demonstrate the enhancements, a new type of solid immersion test bed, the solid immersion Lloyd's mirror interference lithography test-bed was constructed. High quality line and space patterns with a half-pitch of 55.5 nm were created using λ = 405 nm, corresponding to a NA of 1.824, that is well in the evanescent regime of light. Image depths of 33-40 nm were seen. Next, the evanescent image was coupled to an effective gain medium made up of a thin layer of hafnium oxide (HfO) upon silicon dioxide (SiO2). This resulted in a considerable depth enhancement, and 105 nm tall structures were imaged. The work in this thesis details the construction of the solid immersion lithography test-bed, describes the implementation of the modeling tools, details the theory and analysis required to achieve the relevant solutions and understanding of the physical mechanism and finally experimentally demonstrates an enhancement that allows evanescent interferometric lithography beyond conventional limits.
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Книги з теми "Radio waves (Theory)"

1

1947-, Yoshimura Kazuaki, and Agui Takeshi 1935-, eds. Mijika na rei de manabu denpa, hikari, shūhasū: Denpa no kiso kara denpa-dokei, chideji, GPS made. Tōkyō: Morikita Shuppan, 2009.

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2

Fuks, I. M. Statisticheskai͡a︡ radiofizika i teorii͡a︡ informat͡s︡ii: Tekst lekt͡s︡ii. Kharʹkov: KhGU, 1985.

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3

Budden, K. G. Radio waves in the ionosphere: The mathematical theory of the reflection of radio waves from stratified ionised layers. Cambridge: Cambridge University Press, 2009.

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4

Graham, Ivan G., Ulrich Langer, Jens M. Melenk, and Mourad Sini. Direct and inverse problems in wave propagation and applications. Berlin: Walter de Gruyter GmbH, 2013.

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5

Janaswamy, Ramakrishna. Efficient parabolic equation solution of radiowave propagation in an inhomogeneous atmosphere and over irregular terrain: Formulation. Monterey, Calif: Naval Postgraduate School, 1994.

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6

Janaswamy, Ramakrishna. Efficient parabolic equation solution of radiowave propagation in an inhomogeneous atmosphere and over irregular terrain: Formulation. Monterey, Calif: Naval Postgraduate School, 1994.

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7

Kotelʹnikov, V. A. Sobranie trudov: K 100-letii︠u︡ so dni︠a︡ rozhdenii︠a︡. Moskva: Fizmatlit, 2008.

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8

Kontorov, D. S. Radioinformatika. Moskva: "Radio i svi͡a︡zʹ", 1993.

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9

Miller, Judi A. Lapsley. An algorithm for calculating the essential bandwidth of a discrete spectrum and the essential duration of a discrete time-series. Groton, CT]: Naval Submarine Medical Research Laboratory, 2001.

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10

National Radio Science Conference (16th 1999 Cairo, Egypt). Proceedings of the Sixteenth National Radio Science Conference, NRSC'99, Cairo, Egypt, February 23-25, 1999. [New York: Institute of Electrical and Electronics Engineers, 1999.

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Частини книг з теми "Radio waves (Theory)"

1

Goss, W. M., Claire Hooker, and Ronald D. Ekers. "The Evolution of Aperture Synthesis Imaging." In Historical & Cultural Astronomy, 613–50. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-07916-0_37.

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AbstractThe theme of interference between radio waves played a key unifying role throughout Pawsey’s career. Pawsey used radio-wave interference to study the structure of the ionosphere for his PhD research (Chap. 7), and it was Pawsey who first realised that radio images of the sky could be made from measurements of radio interference. Since these observations are made in the aperture plane and not the image plane, this is referred to as “indirect imaging”. When electromagnetic waves from the same source combine, they can either reinforce or cancel depending on the path difference. This makes the classical beating interference patterns often referred to as “fringes”. The first interference patterns in the radio were seen by Hertz between 1886 and 1889 during the course of his experiments to prove that the radio waves he had detected had the interference properties predicted by Maxwell’s electromagnetic theory (Pierce, 1910).
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2

Reames, Donald V. "A Turbulent History." In Solar Energetic Particles, 19–48. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66402-2_2.

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AbstractLarge solar energetic-particle (SEP) events are clearly associated in time with eruptive phenomena on the Sun, but how? When large SEP events were first observed, flares were the only visible candidate, and diffusion theory was stretched to explain how the particles could spread through space, as widely as observed. The observation of coronal mass ejections (CMEs), and the wide, fast shock waves they can drive, provided better candidates later. Then small events were found with 1000-fold enhancements in 3He/4He that required a different kind of source—should we reconsider flares, or their open-field cousins, solar jets? The 3He-rich events were soon associated with the electron beams that produce type III radio bursts. It seems the radio astronomers knew of both SEP sources all along. Sometimes the distinction between the sources is blurred when shocks reaccelerate residual 3He-rich impulsive suprathermal ions. Eventually, however, we would even begin to measure the source-plasma temperature that helps to better distinguish the SEP sources.
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3

Zheng, Zhiyong. "The Basis of Code Theory." In Financial Mathematics and Fintech, 35–89. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0920-7_2.

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AbstractThe channel of information transmission is called channel for short. The commonly used channels include cable, optical fiber, medium of radio wave transmission and carrier line, etc., and also include tape, optical disk, etc. The channel constitutes the physical conditions for social information to interact across space and time. In addition, a piece of social information, such as various language information, picture information, data information and so on, should be exchanged across time and space, information coding is the basic technical means. What is information coding? In short, it is the process of digitizing all kinds of social information.
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4

Zarka, P., W. S. Kurth, and Philippe Zarka. "Radio Wave Emission from the Outer Planets before Cassini." In The Outer Planets and their Moons, 371–97. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-4038-5_19.

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5

Xu, Liu-Jun, and Ji-Ping Huang. "Theory for Effective Advection Effect: Spatiotemporal Modulation." In Transformation Thermotics and Extended Theories, 191–206. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5908-0_14.

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AbstractIn this chapter, we introduce spatiotemporal modulation to realize thermal wave nonreciprocity. The major mechanism is the effective advection effect of spatiotemporal modulation in an open thermal system. We further analyze the phase difference between two spatiotemporally modulated parameters, which offers a tunable parameter to control nonreciprocity. We further define a rectification ratio based on the reciprocal of spatial decay rates and discuss the nonreciprocity conditions accordingly. Finite-element simulations are performed to confirm theoretical predictions, and experimental suggestions are provided to ensure the feasibility of spatiotemporal modulation. These results have potential applications in realizing thermal detection and thermal stabilization simultaneously.
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6

Birand, A. A., and M. A. Awad. "The effect of confining stress and void ratio on the rate effect parameter for driven open-ended piles." In Application of Stress-Wave Theory to Piles, 51–54. London: Routledge, 2022. http://dx.doi.org/10.1201/9781315137544-7.

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7

Anisimov, V. G., V. N. Perelomov, L. O. Myrova, and D. A. Aminev. "Analysis of the Possibilities of Using the Means of Tropospheric cm-Wave Radio Communication with a Time Division Duplex in Telecommunication Systems." In Developments in Language Theory, 514–24. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99447-5_44.

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8

Reames, Donald V. "Gradual SEP Events." In Solar Energetic Particles, 97–133. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66402-2_5.

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AbstractGradual solar energetic-particle (SEP) events are “big proton events” and are usually much more “gradual” in their decay than in their onset. As their intensities increase, particles streaming away from the shock amplify Alfvén waves that scatter subsequent particles, increasing their acceleration, eventually limiting ion flow at the “streaming limit.” Waves generated by higher-speed protons running ahead can also throttle the flow of lower-energy ions, flattening spectra and altering abundances in the biggest SEP events. Thus, we find that the A/Q-dependence of scattering causes element-abundance patterns varying in space and time, which define source-plasma temperatures T, since the pattern of Q values of the ions depends upon temperature. Differences in T explain much of the variation of element abundances in gradual SEP events. In nearly 70% of gradual events, SEPs are shock-accelerated from ambient coronal plasma of ~0.8–1.6 MK, while 24% of the events involve material with T ≈ 2–4 MK re-accelerated from residual impulsive-suprathermal ions with pre-enhanced abundances. This source-plasma temperature can occasionally vary with solar longitude across the face of a shock. Non-thermal variations in ion abundances in gradual SEP events reaccelerated from the 2–4 MK impulsive source plasma are reduced, relative to those in the original impulsive SEPs, probably because the accelerating shock waves sample a pool of ions from multiple jet sources. Late in gradual events, SEPs become magnetically trapped in a reservoir behind the CME where spectra are uniform in space and decrease adiabatically in time as the magnetic bottle containing them slowly expands. Finally, we find variations of the He/O abundance ratio in the source plasma of different events.
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Wang, Helsin, and Chung-Yue Wang. "Effect of Length-to-Diameter Ratio on the Usable Frequency Range of Impulse Response Testing in Pile Foundations." In 10th International Conference on Stress Wave Theory and Testing Methods for Deep Foundations, 273–85. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2019. http://dx.doi.org/10.1520/stp161120170149.

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Fathi, Jamal. "Improvement in Strength of Radio Wave Propagation Outside the Coverage Area of the Mobile Towers for Cellular Mobile WiFi." In 13th International Conference on Theory and Application of Fuzzy Systems and Soft Computing — ICAFS-2018, 464–71. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-04164-9_62.

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Тези доповідей конференцій з теми "Radio waves (Theory)"

1

Myra, J. R., and D. A. D’Ippolito. "Theory of sheared flow generation by applied radio frequency waves." In The thirteenth topical conference on radio frequency power in plasmas. AIP, 1999. http://dx.doi.org/10.1063/1.59694.

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Yoshida, Teruaki, Ryusuke Fujimoto, Koichi Shin, and Masahiro Nishi. "Characteristics of the FM radio waves propagated over the epicenters." In 2010 URSI International Symposium on Electromagnetic Theory (EMTS 2010). IEEE, 2010. http://dx.doi.org/10.1109/ursi-emts.2010.5637308.

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3

Cincotti, G., F. Gori, M. Santarsiero, R. Serrecchia, F. Frezza, G. Schettini, and F. Santini. "Full-wave theory of a quasi-optical launching system for lower-hybrid waves: Preliminary results." In The tenth topical conference on radio frequency power in plasmas. AIP, 1994. http://dx.doi.org/10.1063/1.45003.

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4

Smolkin, Eugene, and Maxim Snegur. "Mathematical Theory of Surface Waves in an Inhomogeneous Waveguide." In 2020 XXXIIIrd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS). IEEE, 2020. http://dx.doi.org/10.23919/ursigass49373.2020.9232273.

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Qin, Hong, Cynthia K. Phillips, Roman A. Kolesnikov, W. Wei-li Lee, Ernest J. Valeo, David N. Smithe, Philip M. Ryan, and David Rasmussen. "Gyrocenter Gauge Theory and Algorithm for Nonlinear Particle Simulations of Radio-Frequency Waves in Plasmas." In RADIO FREQUENCY POWER IN PLASMAS: 17th Topical Conference on Radio Frequency Power in Plasmas. AIP, 2007. http://dx.doi.org/10.1063/1.2800534.

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Shestopalov, Yury, and Ekaterina Kuzmina. "On Recent Findings in the Theory of Complex Waves in Open Metal-Dielectric Waveguides." In 2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC). IEEE, 2018. http://dx.doi.org/10.23919/ursi-at-rasc.2018.8471541.

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7

Cairns, R. A. "A simple theory of relativistic damping of electromagnetic cyclotron and electron Bernstein waves in tokamaks." In RADIO FREQUENCY POWER IN PLASMAS:14th Topical Conference. AIP, 2001. http://dx.doi.org/10.1063/1.1424225.

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8

Stallard, Barry W., S. L. Allen, J. A. Byers, T. A. Casper, B. I. Cohen, R. H. Cohen, C. J. Lasnier, et al. "Experiments on nonlinear absorption of ECH waves in MTX and a comparison with theory." In The tenth topical conference on radio frequency power in plasmas. AIP, 1994. http://dx.doi.org/10.1063/1.44983.

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9

Palkin, Evgeny A., and Anna A. Petrovich. "Diffraction-Beam Theory of HF Radio Waves Propagation in The Description of Ionospheric Layers Translucency Effect." In 2019 Russian Open Conference on Radio Wave Propagation (RWP). IEEE, 2019. http://dx.doi.org/10.1109/rwp.2019.8810399.

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Lazzaro, E., and G. Ramponi. "Theory and calculation of current profile control near rational surfaces in a tokamak by E. C. Waves." In The 11th topical conference on radio frequency power in plasmas. AIP, 1996. http://dx.doi.org/10.1063/1.49540.

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Звіти організацій з теми "Radio waves (Theory)"

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Abdolmaleki, Kourosh. PR-453-134504-R05 On Bottom Stability Upgrade - MS III. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), November 2021. http://dx.doi.org/10.55274/r0012195.

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The extension of the PRCI on bottom stability (OBS) software's applicability to shallow water is assessed. Version 3 of the software has a limitation on water depth; only depths greater than 6 m (20 ft) are accepted. This limitation is likely related to the increasing inaccuracy of linear wave theory as the wave height to water depth ratio increases, as well as caution about breaking wave limits. The usage of linear wave theory inside the software can be categorized into two different types: � Linear regular waves - these are used in the Level 1 module to determine the motions of the water particles as part of the calculation of the hydrodynamic forces; � Linear irregular waves - these are present in the Level 2, Level 3 and ASM modules, where the surface wave energy spectra are converted to the near-seabed wave velocities through the use of a transfer function based on linear wave theory. It is noted that for irregular waves, all wave spectral formulations currently implemented in the OBS software, do not account for water depth. This document addresses the finite water depth and shallow water restrictions and presents a discussion and investigation in two categories: 1. The direct use of the linear theory to describe waves in the Level 1 calculation module; and 2. The direct use of linear spectral transfer functions in the Level 2, Level 3, and ASM modules. The scope of this activity is to prepare a solution for consideration by PRCI and implement the agreed course of action. The solution proposed will be based on the continued use of the linear wave theory. It is noted that higher order wave theories would be more appropriate for shallow water conditions, but due to the currently established methodology in the software, implementation of higher order wave theory is not included within this scope.
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Gopalswamy, Nat, Pertti Mäkelä, and Seiji Yashiro. A Catalog of Type II radio bursts observed by Wind/WAVES and their Statistical Properties. Balkan, Black sea and Caspian sea Regional Network for Space Weather Studies, March 2020. http://dx.doi.org/10.31401/sungeo.2019.02.03.

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Gopalswamy, Nat, Pertti Mäkelä, and Seiji Yashiro. A Catalog of Type II radio bursts observed by Wind/WAVES and their Statistical Properties. Balkan, Black sea and Caspian sea Regional Network for Space Weather Studies, March 2020. http://dx.doi.org/10.31401/sungeo.2020.02.03.

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4

Firpo, Sergio P., Julián Messina, and Francisco H. G. Ferreira. Ageing Poorly?: Accounting for the Decline in Earnings Inequality in Brazil, 1995-2012. Inter-American Development Bank, March 2017. http://dx.doi.org/10.18235/0011789.

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The Gini coefficient of labor earnings in Brazil fell by nearly a fifth between 1995 and 2012, from 0.50 to 0.41. The decline in earnings inequality was even larger by other measures, with the 90-10 percentile ratio falling by almost 40 percent. Although the conventional explanation of a falling education premium did play a role, an RIF regression-based decomposition analysis suggests that the decline in returns to potential experience was the main factor behind lower wage disparities during the period. Substantial reductions in the gender, race, informality and urbanrural wage gaps, conditional on human capital and institutional variables, also contributed to the decline. Although rising minimum wages were equalizing during 2003-2012, they had the opposite effects during 1995-2003, because of declining compliance. Over the entire period, the direct effect of minimum wages on inequality was muted.
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Quak, Evert-jan. The Link Between Demography and Labour Markets in sub-Saharan Africa. Institute of Development Studies (IDS), January 2020. http://dx.doi.org/10.19088/k4d.2021.011.

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This rapid review synthesises the literature from academic, policy, and knowledge institution sources on how demography affects labour markets (e.g. entrants, including youth and women) and labour market outcomes (e.g. capital-per-worker, life-cycle labour supply, human capital investments) in the context of sub-Saharan Africa. One of the key findings is that the fast-growing population in sub-Saharan Africa is likely to affect the ability to get productive jobs and in turn economic growth. This normally happens when workers move from traditional (low productivity agriculture and household businesses) sectors into higher productivity sectors in manufacturing and services. In theory the literature shows that lower dependency ratios (share of the non-working age population) should increase output per capita if labour force participation rates among the working age population remain unchanged. If output per worker stays constant, then a decline in dependency ratio would lead to a rise in income per capita. Macro simulation models for sub-Saharan Africa estimate that capital per worker will remain low due to consistently low savings for at least the next decades, even in the low fertility scenario. Sub-Saharan African countries seem too poor for a quick rise in savings. As such, it is unlikely that a lower dependency ratio will initiate a dramatic increase in labour productivity. The literature notes the gender implications on labour markets. Most women combine unpaid care for children with informal and low productive work in agriculture or family enterprises. Large family sizes reduce their productive labour years significantly, estimated at a reduction of 1.9 years of productive participation per woman for each child, that complicates their move into more productive work (if available). If the transition from high fertility to low fertility is permanent and can be established in a relatively short-term period, there are long-run effects on female labour participation, and the gains in income per capita will be permanent. As such from the literature it is clear that the effect of higher female wages on female labour participation works to a large extent through reductions in fertility.
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León, Carlos. Digital Operational Resilience Act (DORA). FNA, July 2023. http://dx.doi.org/10.69701/deff9232.

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One of the key lessons of the 2007-2008 global financial crisis is the importance of financial market infrastructures (FMIs) as a pillar of financial stability. Before, the role of financial market infrastructures, namely the provision of trading, clearing, settling, recording, and compressing services for transactions between financial institutions (FIs) was often taken for granted. This was reflected in FMIs having often been referred to as the financial system’s plumbing, including by the Federal Reserve’s 14th chairman (Bernanke, 2011)—a clear reference to the critical yet concealed importance of FMIs in the safe and efficient functioning of financial markets. Today, it is clear that the failure of an important FMI will almost certainly lead to systemic instability in financial markets. Given this, it is evident that FMIs are critical infrastructures; that is, based on a definition by the European Commission (2008), FMIs can be considered systems that are essential for the maintenance of vital societal functions, health, safety, security, economic or social well-being of people. In light of this importance, it’s perhaps surprising that the literature about financial networks has addressed the importance of FMIs rather recently and sparingly. The archetypical financial network, composed of FIs as elements (the nodes) that are interlinked through different types of relations (e.g., exposures, payments, ownership, common holdings), has been complemented by the introduction of FMIs as an additional layer that provides a medium for FIs to interact. As highlighted in Berndsen, et al. (2018), a network of FIs that does not include FMIs is a logical network—one that displays bilateral relations despite those requiring the intervention of an FMI to exist. And that’s why the plumbing reference is particularly illustrative: when looking at the floor plan of a house, the plumbing is a critical additional layer hidden beneath the first—immediately visible—layer; in a building, carelessly knocking down a wall could have a disastrous effect on the supply of water, electricity, gas, communications within the apartment and even to others above and below–not to mention the effect on the structural integrity of the building. However, there are further layers beneath those containing FIs and FMIs. In fact, a financial network composed of FIs and FMIs is still a logical network, as the connections between FIs and FMIs also require the intervention of other elements to exist. Those elements provide the physical connection that enables the interlinkages among FIs and FMIs, in the form of wired (e.g., cable) or wireless (e.g., radio waves) connections. That is, as stated by Berndsen, et al. (2018), the interdependence of financial markets with physical networks, such as power and communication networks, make those networks critical infrastructures and obvious candidates for examining the stability of financial systems from an operational perspective.
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