Bibliografie tematiche / Radio waves

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Letteratura scientifica selezionata sul tema "Radio waves"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 luglio 2024

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Articoli di riviste sul tema "Radio waves"

Hodkinson, Liam, e Elizabeth Stitt. "Radio Waves". Index on Censorship 39, n. 2 (giugno 2010): 49–50. http://dx.doi.org/10.1177/03064220100390021001.

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Apple, Jacki, Regine Beyer e Richard Kostelanetz. "Making Radio Waves". TDR (1988-) 36, n. 2 (1992): 7. http://dx.doi.org/10.2307/1146189.

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Rakusen, Sam. "Making radio waves!" Primary Teacher Update 2013, n. 18 (marzo 2013): 53. http://dx.doi.org/10.12968/prtu.2013.1.18.53b.

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O'Sullivan, Mike. "Making radio waves". A Life in the Day 10, n. 2 (maggio 2006): 6–8. http://dx.doi.org/10.1108/13666282200600013.

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Dyson, Frances. "Radio Art in Waves". Leonardo Music Journal 4 (1994): 9. http://dx.doi.org/10.2307/1513174.

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Dixon, E. "Radio waves of progress". Engineering & Technology 4, n. 5 (14 marzo 2009): 40–41. http://dx.doi.org/10.1049/et.2009.0506.

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Wait, J. R. "Propagation Of Radio Waves". IEEE Antennas and Propagation Magazine 40, n. 2 (aprile 1998): 88. http://dx.doi.org/10.1109/map.1998.683546.

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Friebele, Elaine. "“Seeing” with radio waves". Eos, Transactions American Geophysical Union 78, n. 30 (1997): 310. http://dx.doi.org/10.1029/97eo00203.

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Storey, L. R. O. "Natural VLF radio waves". Planetary and Space Science 37, n. 8 (agosto 1989): 1021–22. http://dx.doi.org/10.1016/0032-0633(89)90058-5.

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Jones, Dyfrig. "Natural VLF Radio Waves". Journal of Atmospheric and Terrestrial Physics 51, n. 2 (febbraio 1989): 151. http://dx.doi.org/10.1016/0021-9169(89)90116-5.

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Tesi sul tema "Radio waves"

Starck, Patrik. "Energy harvesting of ambient radio waves". Thesis, Uppsala universitet, Avdelningen för datorteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355020.

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The aim for this thesis was to investigate if harvesting of ambient radio waves could be a viable source of energy and where and when it can be used. A survey of the signal strengths at different locations in Uppsala, Sweden was performed which showed that the cellular frequency bands were the ones that carried the most energy. One circuit was manufactured and two more were simulated, together with the circuitry required to measure and display how much energy that was being harvested. The design was tested at the same locations as the survey of the signal strength was conducted at. The maximum harvested energy was 35µW which was at a location inside in a window facing a cellular transmittor with an approximate distance of 100m. At 200m away from a cellular transmitter, the output was 1µW. In a typical city environment, the output from the harvester was 0µW. The harvesting technique was also compared to energy from solar- and thermal energy. The comparison showed that it is almost always more beneficial to use an alternative source of energy, such as solar cells, even indoors.

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Hawbaker, Dwayne Allen. "Indoor wide band radio wave propagation measurements and models at 1.3 ghz and 4.0 ghz /". This resource online, 1989. http://scholar.lib.vt.edu/theses/available/etd-08182009-040436/.

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Pala, Fatih. "Frequency and polarization diversity simulations for Urban UAV communication and data links". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Sep%5FPala.pdf.

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Rasam, Setty Harish Raghav. "Assessment of Volumetric Water Content Using Radio Waves". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Volumetric water content evaluation in structures, substructures, soils, and subsurface in general is a crucial issue in a wide range of applications. The main weakness of subsurface moisture sensing techniques is usually related both to the lack of cost-effectiveness of measurements, and to unsuitable support scales with respect to the extension of the surface to be investigated. In this regard, Wireless Underground Sensor Network are increasingly used non-destructive tool specifically suited for characterization and measurement. It is undeniable that wireless communication technology has become a very important component of modern society. One aspect of modern society in which application of wireless communication technologies has tremendous potential is in agricultural production. This is especially true in sensing and transmission of relevant farming information such as weather, crop development, water quantity and quality, among others, which would allow farmers to make more accurate and timely farming decisions. Although many systems are commercially available for soil moisture monitoring, there are still many important factors, such as cost, limiting widespread adoption of this technology among growers. Our objective in this study was, therefore, to develop and test an affordable wireless communication system for monitoring soil moisture. WUSN is a specialized kind of WSN that mainly focuses on the use of sensors at the subsurface region of the soil, that is, the top few meters of the soil. This thesis emphasizes on comparison of experimental measurements conducted with wireless devices based on LoRa using point to point communication to the advanced channel models (precisely on single-path channel model) that were developed to characterize the underground wireless channel considering the characteristics of the propagation of EM waves in soil and their relationship with the frequency of these waves, the soil composition, and the soil moisture.

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Ciavarella, Michele. "Volumetric soil moisture evaluation via radio waves propagation". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Nowadays technology plays an important role in different sectors of farm management, in particular technologies based on soil moisture assessment have proven to be efficient in helping farmers who need timely techniques to determine crop water requirements. The main weakness of subsurface moisture sensing techniques is usually related both to the lack of cost-effectiveness of measurements and to unsuitable support scales with respect to the extension of the surface to be investigated. In this regard, Wireless Underground Sensor Network are increasingly used non-destructive tool specifically suitable for characterization and measurement. Wireless communication within a dense substance such as soil is, however, significantly more challenging than through air. This factor, combined with the necessity to conserve energy due to the difficulty of unearthing and recharging WUSN devices, requires that communication protocols be redesigned to be as efficient as possible. This work focuses on problem of implementing a Wireless Underground Sensor Network using LoRa technology, one of the most prominent Low Power Wide Area Network technologies, for communication. A system for monitoring soil moisture is implemented using low cost solutions and results are presented.

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Lange, Martin, e Christoph Jacobi. "Analysis of gravity waves from radio occultation measurements". Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-217072.

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In the height range 10–30 km atmospheric gravity waves lead to periodic perturbations of the background temperature field in the order of 2-3 K, that are resolved in temperature profiles derived from radio occultation measurements. Due to the spherical symmetry assumption in the retrieval algorithm and the low horizontal resolution of the measurement damping in the amplitude and phase shift of the waves occurs leading to remarkable errors in the retrieved temperatures. The influence of the geometric wave parameters and the measurement geometry on plane gravity waves in the range 100-1000 km horizontal and 1-10 km vertical wavelength is investigated with a 2D model ranging ±1000 km around the tangent point and 10-50 km in height. The investigation shows, that with radio occultation measurements more than 90 % of the simulated waves can be resolved and more than 50% with amplitudes above 90%. But the geometrical parameters cannot be identified, since one signal can be attributed to different combinations of wave parameters and view angle. Even short waves with horizontal wavelengths below 200 km can be derived correctly in amplitude and phase if the vertical tilt is small or the view angle of the receiver satellite is in direction of the wave crests
Atmosphärische Schwerewellen führen im Höhenbereich 10-30 km zu periodischen Störungendes Hintergrundtemperaturfeldes in der Größenordnung von 2-3 K, die in Temperaturprofilen aus Radiookkultationsmessungen aufgelöst werden. Aufgrund der sphärischen Symmetrieannahme im Retrievalverfahren und durch die niedrige horizontale Auflösung des Messverfahrens werden Phasenverschiebungen und Dämpfung der Amplitude verursacht, die zu beachtlichen Fehlern bei den abgeleiteten Temperaturen führen. Der Einfluss der geometrischen Wellenparameter und der Messgeometrie auf ebene Schwerewellen im Bereich 100-1000 km horizontale und 1-10 km vertikale Wellenlänge wird untersucht mit einem 2D-Modell, dass sich auf ein Gebiet von ±1000 km um den Tangentenpunkt und von 10-50 km in der Höhe erstreckt. Die Untersuchung zeigt, dass mit Radiookkultationsmessungen mehr als 90% der simulierten Wellen aufgelöst werden und mehr als 50% mit Amplituden oberhalb von 90% der ursprünglichen. Die geometrischen Parameter können jedoch nicht aus Einzelmessungen abgeleitet werden, da ein Signal zu verschiedenen Kombinationen von Wellenparametern und Sichtwinkel zugeordnet werden kann. Auch relativ kurze Wellen mit horizontalen Wellenlängen unterhalb von 200 km können korrekt in der Amplitude und Phase aufgelöst werden, falls die Neigung des Wellenvektors gegen die vertikale gering ist oder der Sichtwinkel des Empfängersatelliten in Richtung der Wellenberge ist

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Lange, Martin, e Christoph Jacobi. "Analysis of gravity waves from radio occultation measurements". Wissenschaftliche Mitteilungen des Leipziger Instituts für Meteorologie ; 26 = Meteorologische Arbeiten aus Leipzig ; 7 (2002), S. 101-108, 2002. https://ul.qucosa.de/id/qucosa%3A15225.

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Abstract (sommario):

In the height range 10–30 km atmospheric gravity waves lead to periodic perturbations of the background temperature field in the order of 2-3 K, that are resolved in temperature profiles derived from radio occultation measurements. Due to the spherical symmetry assumption in the retrieval algorithm and the low horizontal resolution of the measurement damping in the amplitude and phase shift of the waves occurs leading to remarkable errors in the retrieved temperatures. The influence of the geometric wave parameters and the measurement geometry on plane gravity waves in the range 100-1000 km horizontal and 1-10 km vertical wavelength is investigated with a 2D model ranging ±1000 km around the tangent point and 10-50 km in height. The investigation shows, that with radio occultation measurements more than 90 % of the simulated waves can be resolved and more than 50% with amplitudes above 90%. But the geometrical parameters cannot be identified, since one signal can be attributed to different combinations of wave parameters and view angle. Even short waves with horizontal wavelengths below 200 km can be derived correctly in amplitude and phase if the vertical tilt is small or the view angle of the receiver satellite is in direction of the wave crests.
Atmosphärische Schwerewellen führen im Höhenbereich 10-30 km zu periodischen Störungendes Hintergrundtemperaturfeldes in der Größenordnung von 2-3 K, die in Temperaturprofilen aus Radiookkultationsmessungen aufgelöst werden. Aufgrund der sphärischen Symmetrieannahme im Retrievalverfahren und durch die niedrige horizontale Auflösung des Messverfahrens werden Phasenverschiebungen und Dämpfung der Amplitude verursacht, die zu beachtlichen Fehlern bei den abgeleiteten Temperaturen führen. Der Einfluss der geometrischen Wellenparameter und der Messgeometrie auf ebene Schwerewellen im Bereich 100-1000 km horizontale und 1-10 km vertikale Wellenlänge wird untersucht mit einem 2D-Modell, dass sich auf ein Gebiet von ±1000 km um den Tangentenpunkt und von 10-50 km in der Höhe erstreckt. Die Untersuchung zeigt, dass mit Radiookkultationsmessungen mehr als 90% der simulierten Wellen aufgelöst werden und mehr als 50% mit Amplituden oberhalb von 90% der ursprünglichen. Die geometrischen Parameter können jedoch nicht aus Einzelmessungen abgeleitet werden, da ein Signal zu verschiedenen Kombinationen von Wellenparametern und Sichtwinkel zugeordnet werden kann. Auch relativ kurze Wellen mit horizontalen Wellenlängen unterhalb von 200 km können korrekt in der Amplitude und Phase aufgelöst werden, falls die Neigung des Wellenvektors gegen die vertikale gering ist oder der Sichtwinkel des Empfängersatelliten in Richtung der Wellenberge ist.

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Thomas, Edwin Christopher. "Phase and amplitude variations in the wave fields of ionospherically reflected radio waves". Thesis, University of Leicester, 1986. http://hdl.handle.net/2381/35807.

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The wavefronts of high frequency (HF) radio waves received after reflection from the ionosphere exhibit both spatial non-linearities and temporal variations which limit the performance of large aperture receiving arrays. The objective of this investigation was to measure the phase and amplitude of ionospherically propagated signals in order to relate these parameters to the reflection process. This thesis describes the design and construction of a large aperture multi-element array and its implementation for wavefrot investigations. The hardware and software developed to control the equipment and to record the measurements are described. The procedures required to verify the performance of the experimental system are discussed and results are presented which demonstrate the accuracy of the measurements. The array was utilised for studies of signals received from several transmitters situated throughout Western Europe. The results obtained demonstrate the widely different behaviour of signals received over the various propagation paths and these have been related to the modal content of the received signals. Limited periods existed during which a single ionospheric mode was received and data corresponding to this condition have been compared with those which would be expected if the signal consisted of both a specular component and a cone of diffracted rays. This model is unable to explain the experimental results. Numerical models of the received signal were therefore developed. Results of these and comparisons with experimental results suggest that the measured parameters can be explained by the existence of a specular component with a varying direction of arrival (DOA), plus some contribution from random components. The experimental results indicate that the random or diffracted components normally contribute less than 10% of the received power in a single moded signal.

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Russell, Thomas A. "Predicting microwave diffraction in the shadows of buildings". Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10222009-125156/.

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Carozzi, Tobia. "Radio waves in the ionosphere : Propagation, generation and detection". Doctoral thesis, Uppsala universitet, Institutionen för astronomi och rymdfysik, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1184.

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We discuss various topics concerning the propagation, generation, and detec-tionof high-frequency (HF) radio waves in the Earth's ionosphere. With re-gardsto propagation, we derive a full wave Hamiltonian and a polarization evo-lutionequation for electromagnetic waves in a cold, stratified magnetoplasma.With regards to generation, we will be concerned with three experiments con-ducted at the ionosphere- radio wave interaction research facilities at Sura, Rus-siaand Tromsø, Norway. These facilities operate high power HF transmittersthat can inject large amplitude electromagnetic waves into the ionosphere andexcite numerous nonlinear processes. In an experiment conducted at the Surafacility, we were able to measure the full state of polarization of stimulatedelectromagnetic emissions for the first time. It is expected that by using thetechnique developed in this experiment it will be possible to study nonlinearpolarization effects on powerful HF pump waves in magnetoplasmas in the fu-ture.In another experiment conducted at the Sura facility, the pump frequencywas swept automatically allowing rapid, high-resolution measurements of SEEdependence on pump frequency with minimal variations in ionospheric condi-tions.At the Tromsø facility we discovered by chance a highly variable, pumpinduced, HF emission that most probably emanated from pump excited spo-radicE. Regarding detection, we have proposed a set of Stokes parametersgeneralized to three dimension space; and we have used these parameters in aninvention to detect the incoming direction of electromagnetic waves of multiplefrequencies from a single point measurement.

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Libri sul tema "Radio waves"

illustrator, Escabasse Sophie, a cura di. Radio waves. London: Wayland, 2014.

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Press, White Pine, a cura di. Radio waves. Buffalo, NY: White Pine Press, 2005.

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Press, White Pine, a cura di. Radio waves: Poems. Buffalo, N.Y: White Pine Press, 2005.

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Richards, John A. Radio Wave Propagation. Guildford: Springer London, 2008.

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1924-, Iwai Akira, a cura di. Natural VLF radio waves. Letchworth, Hertfordshire, England: Research Studies Press, 1988.

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Maclean, T. S. M. Radiowave propagation over ground. London: Chapman & Hall, 1993.

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Alvarez, Gloria. Heart waves. Bensalem, PA: Meteor Pub., 1992.

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1920-, Cullen A. L., International Union of Radio Science. e International Council of Scientific Unions., a cura di. Modern radio science. Oxford, OX: Published for the International Union of Radio Science and the ICSU Press by Oxford University Press, 1988.

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E, Kerr Donald, e Institution of Electrical Engineers, a cura di. Propagation of short radio waves. London, U.K: P. Peregrinus on behalf of the Institution of Electrical Engineers, 1987.

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E, Kerr Donald, a cura di. Propagation of short radio waves. Los Altos, Calif: Peninsula Publishing, 1988.

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Capitoli di libri sul tema "Radio waves"

Lauterbach, Thomas. "What Are Electromagnetic Waves?" In Radio Astronomy, 11–23. Wiesbaden: Springer Fachmedien Wiesbaden, 2022. http://dx.doi.org/10.1007/978-3-658-36035-1_2.

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Kozlov, Anatoly Ivanovich, Yuri Grigoryevich Shatrakov e Dmitry Alexandrovich Zatuchny. "Propagation of Radio Waves". In Radar and Radionavigation, 33–67. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6191-5_2.

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Anand, M. L. "Propagation of Radio Waves". In Principles of Communication Engineering, 557–72. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003222279-26.

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Nahin, Paul J. "Preradio History of Radio Waves". In The Science of Radio, 13–25. New York, NY: Springer New York, 2001. http://dx.doi.org/10.1007/978-1-4613-0173-8_2.

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Kozlov A. I., Logvin A. I., Sarychev V. A., Shatrakov Y. G. e Zavalishin O. I. "Own Radio Emission and Scattering of Radio Waves". In Springer Aerospace Technology, 247–77. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8395-3_7.

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Shinozawa, Yasuo. "Effective Use of Radio Waves". In Telecommunications Policies of Japan, 111–30. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1033-5_6.

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Krchňák, Martin, Marek Češkovič, Pavol Kurdel e Anton Panda. "Anechoic Chambers for Radio Waves". In Lecture Notes in Electrical Engineering, 3–12. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-48835-1_2.

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Goss, W. M., Claire Hooker e 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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Sizun, Hervé. "Radio Mobile Measurement Techniques". In Measurements using Optic and RF Waves, 191–227. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118586228.ch8.

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Ghasemi, Abdollah, Ali Abedi e Farshid Ghasemi. "Propagation of Radar Waves". In Propagation Engineering in Radio Links Design, 299–365. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5314-7_6.

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Atti di convegni sul tema "Radio waves"

Wedepohl, E. "Radio Wave Tomography: Imaging Ore Bodies Using Radio Waves". In 3rd SAGA Biennial Conference and Exhibition. European Association of Geoscientists & Engineers, 1993. http://dx.doi.org/10.3997/2214-4609-pdb.224.028.

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Sus, Bogdan A., e Bogdan B. Sus. "Wave-particle nature of radio waves". In 2016 13th International Conference on Modern Problems of Radio Engineering, Telecommunications and Computer Science (TCSET). IEEE, 2016. http://dx.doi.org/10.1109/tcset.2016.7451959.

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Goertz, C. K. "Planetary radio waves". In AIP Conference Proceedings Volume 144. AIP, 1986. http://dx.doi.org/10.1063/1.35658.

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Tantisopharak, Tanawut, e Monai Krairiksh. "Applications of Electromagnetic Waves to the Quality Control of Agricultural Products". In 2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO). IEEE, 2018. http://dx.doi.org/10.23919/radio.2018.8572300.

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Yi, J., A. de Lustrac, G. P. Piau e S. N. Burokur. "All-dielectric microwave devices for controlling the path of electromagnetic waves". In 2016 IEEE Radio and Antenna Days of the Indian Ocean (RADIO). IEEE, 2016. http://dx.doi.org/10.1109/radio.2016.7772008.

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null. "Interstellar Scattering of Radio Waves". In AIP Conference Proceedings Volume 174. AIP, 1988. http://dx.doi.org/10.1063/1.2931558.

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Xiong, Fuzhi. "HF radio waves propagation model based on sky wave". In 3RD INTERNATIONAL CONFERENCE ON MATERIALS SCIENCE, RESOURCE AND ENVIRONMENTAL ENGINEERING (MSREE 2018). Author(s), 2018. http://dx.doi.org/10.1063/1.5075706.

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Kaufman, Allan N. "Conversion among collective waves via gyroballistic waves". In RADIO FREQUENCY POWER IN PLASMAS:14th Topical Conference. AIP, 2001. http://dx.doi.org/10.1063/1.1424220.

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Karaev, V. Yu, M. A. Panfilova, Yu A. Titchenko, Eu M. Meshkov e G. N. Balandina. "Remote sensing of the sea waves by the dual-frequency precipitation radar: First results". In 2015 IEEE Radio and Antenna Days of the Indian Ocean (RADIO). IEEE, 2015. http://dx.doi.org/10.1109/radio.2015.7323413.

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Pak, O. V., e V. D. Zakharchenko. "Radio pulse Stroboscopic Transformation of Coherent Radio Signals in Conditions of Interference". In 2019 Radiation and Scattering of Electromagnetic Waves (RSEMW). IEEE, 2019. http://dx.doi.org/10.1109/rsemw.2019.8792692.

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Rapporti di organizzazioni sul tema "Radio waves"

Lee, M. C. Space Plasma Effects and Interactions With Radio Waves. Fort Belvoir, VA: Defense Technical Information Center, maggio 2001. http://dx.doi.org/10.21236/ada387788.

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Tricoles, G., E. L. Rope e J. L. Nilles. Real Time Imaging with Radio Waves and Microwaves. Fort Belvoir, VA: Defense Technical Information Center, agosto 1986. http://dx.doi.org/10.21236/ada175515.

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Mishin, Evgeny. Physics of the Geospace Response to Powerful HF Radio Waves. Fort Belvoir, VA: Defense Technical Information Center, ottobre 2012. http://dx.doi.org/10.21236/ada569091.

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Gandy, R., e D. Swanson. Experimental studies of radio frequency waves and confinement in the Auburn Torsatron. Office of Scientific and Technical Information (OSTI), gennaio 1990. http://dx.doi.org/10.2172/5175255.

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Sales, Gary S., Bodo W. Reinisch e Claude G. Dozois. Preliminary Investigation of Ionospheric Modification Using Oblique Incidence High Power HF Radio Waves. Fort Belvoir, VA: Defense Technical Information Center, settembre 1986. http://dx.doi.org/10.21236/ada179174.

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Gopalswamy, Nat, Pertti Mäkelä e 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, marzo 2020. http://dx.doi.org/10.31401/sungeo.2019.02.03.

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Porkolab, Miklos, Alessandro marinoni, Jon Chris Rost, R. Seraydarian e E. Davis. Development of an Ultrahigh-bandwidth Phase Contrast Imaging System for detection of electron scale turbulence and Gigahertz Radio-Frequency Waves. Office of Scientific and Technical Information (OSTI), maggio 2021. http://dx.doi.org/10.2172/1784771.

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

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Abstract (sommario):

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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Tawk, Youssef, e Christopher Romero. Millimeter Wave Radio Frequency Propagation Model Development. Fort Belvoir, VA: Defense Technical Information Center, agosto 2014. http://dx.doi.org/10.21236/ada609960.

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