Academic literature on the topic 'Wave frequencies'

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Journal articles on the topic "Wave frequencies"

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Austiguy, George E., and Robert L. Brown. "Application of a mixture theory to stress waves in snow." Annals of Glaciology 18 (1993): 274–80. http://dx.doi.org/10.1017/s0260305500011642.

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A continuum theory of mixtures is applied to model snow as a mixture of an elastic solid and an elastic fluid. Three wave types, two dilational and one rotational, are shown to exist. Numerical evaluation shows velocity and attenuation increasing with frequency for all three waves. Wave velocity increases with increasing density while attenuation decreases with increasing density for all three waves. The first dilational wave is associated with the pore fluid, has a slow wave speed and is highly attenuated. This wave exhibits diffusive behavior at low frequencies and nondispersive behavior at
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Austiguy, George E., and Robert L. Brown. "Application of a mixture theory to stress waves in snow." Annals of Glaciology 18 (1993): 274–80. http://dx.doi.org/10.3189/s0260305500011642.

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A continuum theory of mixtures is applied to model snow as a mixture of an elastic solid and an elastic fluid. Three wave types, two dilational and one rotational, are shown to exist. Numerical evaluation shows velocity and attenuation increasing with frequency for all three waves. Wave velocity increases with increasing density while attenuation decreases with increasing density for all three waves. The first dilational wave is associated with the pore fluid, has a slow wave speed and is highly attenuated. This wave exhibits diffusive behavior at low frequencies and nondispersive behavior at
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Winbow, Graham A. "A theoretical study of acoustic S-wave and P-wave velocity logging with conventional and dipole sources in soft formations." GEOPHYSICS 53, no. 10 (1988): 1334–42. http://dx.doi.org/10.1190/1.1442411.

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This paper is focused on the special features of the wavetrains recorded by conventional and dipole sonic logging tools in soft formations defined to be those whose shar velocity is less than the sound velocity of drilling mud. Such formations are commonn in the Gulf Coast, the Canadian Arctic, the Bass Strait of Australia, and many other region. A conventional logging tool operating at normal frequencies [Formula: see text] records P waves, water waves, and Stoneley waves in soft formations. A dipole tool records modal waves and water waves at frequencies of order 15 kHz, but produces almost
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He, Wen, Xiao Jiang Luo, Kui Zhao, Wang Cheng, and Chun Hui Zhong. "Experimental Study of High Frequency Guided Wave Inspection of Anchored Bolts." Applied Mechanics and Materials 117-119 (October 2011): 962–66. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.962.

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High frequency longitudinal guided waves were used to inspect the anchored rock bolts. Experiments were conducted to find the optimal frequencies for the bolt testing. A broad-band signal was excited at the top end of the bolt, and the power spectral density(PSD) analysis of the bolt end reflected waves was made. Base on that the frequency component of the bolt end reflected waves could be obtain, and the frequencies with higher power spectral density values are the optimal ones. At optimal frequencies, the guided wave attenuates more slightly than it is at other frequencies and the bolt end r
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Ivakhnik, V. V., and M. V. Savelyev. "Transient four-wave mixing in a transparent two-component medium." Computer Optics 42, no. 2 (2018): 227–35. http://dx.doi.org/10.18287/2412-6179-2018-42-2-227-235.

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We analyze changes in the spatial structure of an object wave under four-wave mixing in a transparent two-component medium in schemes with opposing and concurrent pump waves. It is shown that in the spatial spectrum of the object wave there is a dip, whose position is determined by the propagation direction of the second pump wave. Angular rotation and frequency shift of the pump waves lead to a decrease in the conversion efficiency of high spatial frequencies. The bandwidth of the spatial frequencies cut out by the four-wave radiation converter decreases monotonically over time, whereas the b
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Willmott, Andrew J., and Estanislao Gavilan Pascual-Ahuir. "Planetary and Gravity Waves in a Polar Basin." Journal of Physical Oceanography 47, no. 6 (2017): 1433–40. http://dx.doi.org/10.1175/jpo-d-16-0253.1.

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AbstractThe eigenfrequencies of freely propagating barotropic, divergent, planetary waves and gravity waves in a spherical polar cap are presented using an approximation in which full spherical geometry is retained in the derivation of the wave amplitude equation. Subsequently, the colatitude angle in the coefficients of the wave amplitude equation is fixed, thereby allowing the eigenvalue problem to be solved using analytical methods. The planetary wave frequencies are compared with published results that adopt the polar-plane approximation to solve the equivalent free-wave problem. Low-order
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Liang, Chao, Ossian O’Reilly, Eric M. Dunham, and Dan Moos. "Hydraulic fracture diagnostics from Krauklis-wave resonance and tube-wave reflections." GEOPHYSICS 82, no. 3 (2017): D171—D186. http://dx.doi.org/10.1190/geo2016-0480.1.

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Fluid-filled fractures support guided waves known as Krauklis waves. The resonance of Krauklis waves within fractures occurs at specific frequencies; these frequencies, and the associated attenuation of the resonant modes, can be used to constrain the fracture geometry. We use numerical simulations of wave propagation along fluid-filled fractures to quantify fracture resonance. The simulations involve solution of an approximation to the compressible Navier-Stokes equation for the viscous fluid in the fracture coupled to the elastic-wave equation in the surrounding solid. Variable fracture aper
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Williamson, C. H. K., and A. Prasad. "Acoustic forcing of oblique wave resonance in the far wake." Journal of Fluid Mechanics 256 (November 1993): 315–41. http://dx.doi.org/10.1017/s0022112093002800.

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In this paper, we investigate to what extent the far-wake ‘signature’ of the near-wake vortex dynamics of a nominally two-dimensional bluff body is affected by the character of the free-stream noise. We confirm the existence of an oblique wave resonance (at frequency, fK–fT), which is caused by nonlinear ‘quadratic’ interactions between primary oblique shedding waves (fK) and secondary two-dimensional waves (fT), which are amplified from free-stream disturbances. In this work, oblique wave resonance is induced by acoustic forcing of two-dimensional waves. The use of acoustic forcing reveals a
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Narita, Y., K. H. Glassmeier, S. Schäfer, et al. "Alfvén waves in the foreshock propagating upstream in the plasma rest frame: statistics from Cluster observations." Annales Geophysicae 22, no. 7 (2004): 2315–23. http://dx.doi.org/10.5194/angeo-22-2315-2004.

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Abstract. We statistically study various properties of low-frequency waves such as frequencies, wave numbers, phase velocities, and polarization in the plasma rest frame in the terrestrial foreshock. Using Cluster observations the wave telescope or k-filtering is applied to investigate wave numbers and rest frame frequencies. We find that most of the foreshock waves propagate upstream along the magnetic field at phase velocity close to the Alfvén velocity. We identify that frequencies are around 0.1xΩcp and wave numbers are around 0.1xΩcp/VA, where Ωcp is the proton cyclotron frequency and VA
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Renji, K., and S. Josephine Kelvina Florence. "Critical Frequencies of Composite Cylindrical Shells." International Journal of Acoustics and Vibration 25, no. 1 (2020): 79–87. http://dx.doi.org/10.20855/ijav.2020.25.11572.

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The sound radiation characteristics of a structure depend on its critical frequency. The expression for theoretically estimating the critical frequency of a composite cylindrical shell has not yet been reported. Thus, the practice is to use the expression for the composite panel for determining the critical frequency of a composite shell. In this work, critical frequencies of composite shells are investigated. As the critical frequency depends on the speed of the bending wave, an expression for the speed of the bending wave is first derived. It is seen that the curvature causes an increase in
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Dissertations / Theses on the topic "Wave frequencies"

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Xu, Hao. "Terrestrial radio wave propagation at millimeter-wave frequencies." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/27522.

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This research focuses on radio wave propagation at millimeter-wave frequencies. A measurement based channel characterization approach is taken in the investigation. First, measurement techniques are analyzed. Three types of measurement systems are designed, and implemented in measurement campaigns: a narrowband measurement system, a wideband measurement system based on Vector Network Analyzer, and sliding correlator systems at 5.8+AH4AXA-mbox{GHz}, 38+AH4AXA-mbox{GHz} and 60+AH4AXA-mbox{GHz}. The performances of these measurement systems are carefully compared both analytically and experimen
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Ryue, Jungsoo. "Wave propagation in railway tracks at high frequencies." Thesis, University of Southampton, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444969.

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Yazdanpanahi, Mani. "Liquid crystal measurements and devices at milimetre-wave frequencies." Thesis, University of Essex, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574471.

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The work presented here provides a comprehensive coverage in the development of an emerging breed of tuneable filters in the millimetre- wave range. It involves the application of nematic liquid crystal (LC) material as substrate to the device. The first focus of the research is accurate characterisation of LC in order to obtain its dielectric properties at millimetre-wave frequencies. Based on the findings, new tuneable filter designs are presented in this thesis. In this thesis, a planar patch resonator is developed to measure the dielectric constants of nematic LC at millimetre-wave frequen
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Nisizawa, Atsushi. "Search for cosmological gravitational-wave background at high frequencies." Kyoto University, 2009. http://hdl.handle.net/2433/123924.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(人間・環境学)<br>甲第14709号<br>人博第445号<br>新制||人||109(附属図書館)<br>20||人博||445(吉田南総合図書館)<br>UT51-2009-D421<br>京都大学大学院人間・環境学研究科相関環境学専攻<br>(主査)教授 阪上 雅昭, 教授 石川 尚人, 准教授 木下 俊哉, 准教授 安東 正樹<br>学位規則第4条第1項該当
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Gridin, Dmitri. "Wave propagation in an elastic half-space at high frequencies." Thesis, London South Bank University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298228.

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Cottet, Didier. "Characterisation of high density substrates for use at millimetre-wave frequencies /." [S.l.] : [s.n.], 2003. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=15205.

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Caldeirinha, Rafael F. S. "Radio characterisation of single trees at micro- and millimetre wave frequencies." Thesis, University of South Wales, 2001. https://pure.southwales.ac.uk/en/studentthesis/radio-characterisation-of-single-trees-at-micro-and-millimetre-wave-frequencies(925a7a06-dc26-4ea4-ab20-68967467d7ee).html.

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Wireless Communications are revolutionising personal and telecommunications services and the way in which they are utilised. Overall growth in cellular, fixed and satellite communication system markets in recent years has exceeded expectations. There is a widespread anticipation that customer demand for wireless telecommunication systems will continue to expand in the foreseeable future. Such systems rely in their planning, design and implementation on the availability of radiowave propagation models. These models are required to describe and characterise with sufficient accuracy the interacti
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Eblabla, Abdalla. "MM-wave frequencies GaN-on-Si HEMTs and MMIC technology development." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/8861/.

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Gallium Nitride (GaN)-based High Electron Mobility Transistors (HEMTs) grown on Silicon (Si) substrates technology is emerging as one of the most promising candidates for cost effective, high-power, high-frequency Integrated Circuit (IC) applications; operating at Microwave and Millimetre (mm)-wave frequencies. To capitalise on the advantages of RF GaN technology grown on Low resistivity (LR) Si substrates; RF losses due to the Si substrate must be eliminated at the active devices, passive devices and interconnect. Low resistivity Si substrates are intrinsic prone to RF losses and high resisti
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Lockyear, Matthew John. "Electromagnetic surface wave mediated absorption and transmission of radiation at microwave frequencies." Thesis, University of Exeter, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410814.

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Barratt, Thomas Henry. "Measurement and modelling of the small-scale effects at millimetre wave frequencies." Thesis, University of Bristol, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.738287.

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Books on the topic "Wave frequencies"

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Simons, Rainee N. Linearly tapered slot antenna radiation characteristics at millimeter-wave frequencies. National Aeronautics and Space Administration, Lewis Research Center, 1998.

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Cottet, Didier. Characterisation of high density substrates for use at millimetre-wave frequencies. Hartung-Gorre, 2003.

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3

Allnutt, J. E. Satellite-to-ground radiowave propagation: Theory, practice, and system impact at frequencies above 1GHz. P. Peregrinus on behalf of the Institution of Electrical Engineers, 1989.

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Simons, Rainee. Propagation characteristics of some novel coplanar waveguide transmission lines on GaAs at MM-wave frequencies. National Aeronautics and Space Administration, 1987.

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RF integrated circuits in VLSI SOI CMOS technology for wireless receivers at millimeter wave frequencies. Hartung-Gorre Verlag, 2005.

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Flock, Warren L. Propagation effects on satellite systems at frequencies below 10 GHz: A handbook for satellite systems design. 2nd ed. National Aeronautics and Space Administration, Scientific and Technical Information Division, 1987.

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Dayton, James A. Computer analysis of spectrum anomaly in 32-GHz traveling-wave tube for Cassini mission. National Aeronautics and Space Administration, Lewis Research Center, 1999.

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ISRR, '07 (2007 Salem India). International Symposium on Rainfall Rate and Radio Wave Propagation (ISRR '07): Salem, India 29-30 January 2007. American Institute of Physics, 2007.

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Development, North Atlantic Treaty Organization Advisory Group for Aerospace Research and. Propagation impact on modern HF communications system design. AGARD, 1986.

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North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propagation impact on modern HF communications system design. AGARD, 1986.

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Book chapters on the topic "Wave frequencies"

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Deferm, Noël, and Patrick Reynaert. "CMOS at Millimeter Wave Frequencies." In Analog Circuits and Signal Processing. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13951-7_2.

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Essen, Helmut. "Airborne Remote Sensing at Millimeter Wave Frequencies." In Radar Remote Sensing of Urban Areas. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3751-0_11.

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Cheema, Hammad M., Reza Mahmoudi, and Arthur H. M. van Roermund. "Layout and Measurements at mm-Wave Frequencies." In 60-GHz CMOS Phase-Locked Loops. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9280-9_3.

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Garrett, Steven L. "Modes of Bars." In Understanding Acoustics. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44787-8_5.

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Abstract The perspectives and techniques developed in the previous chapters will now be applied to calculation of wave propagation in solids. Their application to longitudinal and shear waves will be both familiar and simple. Even more satisfying is the success of those same techniques in finding solutions for waves in a system that does not obey the wave equation and exhibit a phase speed that varies with frequency. Measurement of the frequencies of the normal modes of thin bars will be used to determine the bars’ elastic constants to high precision. The relationship between measured modal frequencies and the elastic moduli is particularly simple because the torsional, flexural, and longitudinal modes of bars can be selectively excited and detected. The technique of resonant ultrasound spectroscopy will allow the extraction of moduli from resonance frequencies even for samples with dimensions that are not as conducive as those of thin bars by a process that is significantly more computationally intensive. The flexural rigidity of wires under tension will be analyzed to determine the normal modes of a “stiff string,” and those effects will be discussed in relation to the tuning of pianos
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Strauch, D. "Ge: phonon frequencies, phonon wave numbers, phonon linewidths." In New Data and Updates for IV-IV, III-V, II-VI and I-VII Compounds, their Mixed Crystals and Diluted Magnetic Semiconductors. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14148-5_251.

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Pérez, Eugenia. "Vibrating Systems with Concentrated Masses: On the High Frequencies and the Local Problem." In Mathematical and Numerical Aspects of Wave Propagation WAVES 2003. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55856-6_25.

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Dransfeld, K. "Quantum Aspects of Rayleigh Waves: Surface- and Interface-Waves at Very High Frequencies." In Springer Series on Wave Phenomena. Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82621-4_9.

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Sturdivant, Rick. "Fundamentals of Packaging at Microwave and Millimeter-Wave Frequencies." In RF and Microwave Microelectronics Packaging. Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0984-8_1.

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Ignatiev, Alexander A. "Electromagnetic Wave Excitation by Waveguide and Stripe-Line Converters." In Magnetoelectronics of Microwaves and Extremely High Frequencies in Ferrite Films. Springer New York, 2009. http://dx.doi.org/10.1007/978-0-387-85457-1_6.

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Lau, Kam Y. "Resonant Modulation of Monolithic Laser Diodes at Millimeter-Wave Frequencies." In Springer Series in Optical Sciences. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-16458-3_9.

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Conference papers on the topic "Wave frequencies"

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Dohler, G., D. Gallagher, F. Scafuri, and R. Moats. "Peniotrons at mm-wave frequencies." In 1987 Twelth International Conference on Infrared and Millimeter Waves. IEEE, 1987. http://dx.doi.org/10.1109/irmm.1987.9127007.

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Francis, Kareem J. Garriga, Mervin Lim Pac Chong, Yiwen E., and Xi-Cheng Zhang. "Nonlinear spectroscopy at terahertz frequencies." In Infrared, Millimeter-Wave, and Terahertz Technologies VII, edited by Xi-Cheng Zhang, Masahiko Tani, and Cunlin Zhang. SPIE, 2020. http://dx.doi.org/10.1117/12.2575255.

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Dohler, G., D. Gallagher, F. Scafuri, and D. Wortman. "Orotron oscillators at mm-wave frequencies." In 1987 Twelth International Conference on Infrared and Millimeter Waves. IEEE, 1987. http://dx.doi.org/10.1109/irmm.1987.9126916.

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Goloshubin, G. M., P. V. Krauklis, L. A. Molotkov, and H. B. Helle. "Slow wave phenomena at seismic frequencies." In SEG Technical Program Expanded Abstracts 1993. Society of Exploration Geophysicists, 1993. http://dx.doi.org/10.1190/1.1822623.

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Walker, R. G. "GaAs/AlGaAs travelling-wave modulators for mm-wave frequencies." In IEE Colloquium: `Towards Terabit Transmission'. IEE, 1995. http://dx.doi.org/10.1049/ic:19950714.

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Sanchez-Escuderos, Daniel, Miguel Ferrando-Bataller, Antonio Berenguer, and Jose I. Herranz. "Circularly-polarized periodic leaky-wave antenna at millimeter-wave frequencies." In 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2013. http://dx.doi.org/10.1109/aps.2013.6710740.

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Henry, M., C. Free, Q. Reynolds, S. Malkmus, and J. Wood. "LTCC Technology at High Millimetre Wave Frequencies." In 2006 1st Electronic Systemintegration Technology Conference. IEEE, 2006. http://dx.doi.org/10.1109/estc.2006.280087.

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Godshalk, Edward M. "Wafer Probing Issues at Millimeter Wave Frequencies." In 22nd European Microwave Conference, 1992. IEEE, 1992. http://dx.doi.org/10.1109/euma.1992.335823.

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Martens, J., and K. Noujeim. "IMD phase analysis at mm-wave frequencies." In 2012 IEEE/MTT-S International Microwave Symposium - MTT 2012. IEEE, 2012. http://dx.doi.org/10.1109/mwsym.2012.6259703.

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Nashashibi, Adib Y., and Kamal Sarabandi. "Long distance wave propagation through rain at high millimeter-wave frequencies." In 2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS). IEEE, 2014. http://dx.doi.org/10.1109/ursigass.2014.6929605.

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Reports on the topic "Wave frequencies"

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Tsang, Leung. Characteristics of Coherent and Incoherent Waves in Snow at Microwave and Millimeter Wave Frequencies. Defense Technical Information Center, 1987. http://dx.doi.org/10.21236/ada188990.

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Shang, X., N. M. Ridler, J. Ding, and M. Geen. Introductory guide to making Planar S-parameter measurements at millimetre-wave frequencies. National Physical Laboratory, 2021. http://dx.doi.org/10.47120/npl.9001.

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Greene, G. J., and R. W. Gould. Observation of ICRF (ion cyclotron range of frequencies) wave-packet propagation in a tokamak plasma. Office of Scientific and Technical Information (OSTI), 1987. http://dx.doi.org/10.2172/5702341.

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Maydykovskiy, Igor, and Petra Užpelkis. The Concept of space-time quanta in future technologies. Intellectual Archive, 2020. http://dx.doi.org/10.32370/iaj.2464.

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The article discusses the possibility of using the technological advantages that appear in connection with the discovery of the physical essence of Time and new interpretation of the structure of space in the form of space-time quanta. One of the problems that can be successfully solved on the basis of the new physical model is the problem of establishing the true nature of gravity. The solution to this problem is directly related to the implementation of the idea of unsupported motion based on the interaction in a certain way of the created asymmetric interference structure of longitudinal wa
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Ono, Masayuki. Investigation of electrostatic waves in the ion cyclotron range of frequencies in L-4 and ACT-1. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10160802.

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Ono, Masayuki. Investigation of electrostatic waves in the ion cyclotron range of frequencies in L-4 and ACT-1. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/6483928.

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Ng, K. Comments on the Impedances of the SSC Shielded Bellows at Low Frequencies Due to the Truncation of the Wake Fields. Office of Scientific and Technical Information (OSTI), 1986. http://dx.doi.org/10.2172/1156288.

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