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Добірка наукової літератури з теми "High frequency currents"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 19 лютого 2023

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Статті в журналах з теми "High frequency currents"

1

Mohsen, A. "High-frequency currents on conducting obstacles." Journal of Physics D: Applied Physics 24, no. 11 (November 14, 1991): 1901–5. http://dx.doi.org/10.1088/0022-3727/24/11/001.

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2

Bandelier, B., C. Daveau, A. Rais, and F. Rioux-Damidau. "Specific formulation for high frequency eddy-currents." IEEE Transactions on Magnetics 35, no. 3 (May 1999): 1171–74. http://dx.doi.org/10.1109/20.767157.

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3

Shay, Lynn K., Jorge Martinez-Pedraja, Thomas M. Cook, Brian K. Haus, and Robert H. Weisberg. "High-Frequency Radar Mapping of Surface Currents Using WERA." Journal of Atmospheric and Oceanic Technology 24, no. 3 (March 1, 2007): 484–503. http://dx.doi.org/10.1175/jtech1985.1.

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Abstract A dual-station high-frequency Wellen Radar (WERA), transmitting at 16.045 MHz, was deployed along the west Florida shelf in phased array mode during the summer of 2003. A 33-day, continuous time series of radial and vector surface current fields was acquired starting on 23 August ending 25 September 2003. Over a 30-min sample interval, WERA mapped coastal ocean currents over an ≈40 km × 80 km footprint with a 1.2-km horizontal resolution. A total of 1628 snapshots of the vector surface currents was acquired, with only 70 samples (4.3%) missing from the vector time series. Comparisons to subsurface measurements from two moored acoustic Doppler current profilers revealed RMS differences of 1 to 5 cm s−1 for both radial and Cartesian current components. Regression analyses indicated slopes close to unity with small biases between surface and subsurface measurements at 4-m depth in the east–west (u) and north–south (υ) components, respectively. Vector correlation coefficients were 0.9 with complex phases of −3° and 5° at EC4 (20-m isobath) and NA2 (25-m isobath) moorings, respectively. Complex surface circulation patterns were observed that included tidal and wind-driven currents over the west Florida shelf. Tidal current amplitudes were 4 to 5 cm s−1 for the diurnal and semidiurnal constituents. Vertical structure of these tidal currents indicated that the semidiurnal components were predominantly barotropic whereas diurnal tidal currents had more of a baroclinic component. Tidal currents were removed from the observed current time series and were compared to the 10-m adjusted winds at a surface mooring. Based on these time series comparisons, regression slopes were 0.02 to 0.03 in the east–west and north–south directions, respectively. During Tropical Storm Henri’s passage on 5 September 2003, cyclonically rotating surface winds forced surface velocities of more than 35 cm s−1 as Henri made landfall north of Tampa Bay, Florida. These results suggest that the WERA measured the surface velocity well under weak to tropical storm wind conditions.
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4

Buckingham, Steven D., and Andrew N. Spencer. "Role of High-Voltage Activated Potassium Currents in High-Frequency Neuronal Firing: Evidence From a Basal Metazoan." Journal of Neurophysiology 88, no. 2 (August 1, 2002): 861–68. http://dx.doi.org/10.1152/jn.2002.88.2.861.

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Certain neurons of vertebrates are specialized for high-frequency firing. Interestingly, high-frequency firing is also seen in central neurons in basal bilateral metazoans. Recently, the role of potassium currents with rightward-shifted activation curves in producing high-frequency firing has come under scrutiny. We apply intracellular recording, patch-clamp techniques, and compartmental modeling to examine the roles of rightward-shifted potassium currents in repetitive firing and shaping of action potentials in central neurons of the flatworm, Notoplana atomata ( Phylum Platyhelminthes). The kinetic properties of potassium and sodium currents were determined from patch-clamp experiments on dissociated brain cells. To predict the effects of changing the steady-state and kinetic properties of these potassium currents, these data were incorporated into a computer model of a 30-μm spherical cell with the levels of current adjusted to approximate the values recorded in voltage-clamp experiments. The model was able to support regenerative spikes at high frequencies in response to injected current. Current-clamp recordings of cultured cells and of neurons in situ also showed evidence of very-high-frequency firing. Adjusting the ratio of inactivating to non-inactivating potassium currents had little effect upon the firing pattern of the cell or its ability to fire at high frequencies, whereas the presence of the non-inactivating current was necessary for repetitive firing. Computer simulations suggested that the rightward shift in voltage sensitivity confers a raised firing threshold, while rapid channel kinetics underlie high frequency firing, and the large activation range enhances the coding range of the cell.
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5

Shay, L. K., T. M. Cook, H. Peters, A. J. Mariano, R. Weisberg, P. E. An, A. Soloviev, and M. Luther. "Very high-frequency radar mapping of surface currents." IEEE Journal of Oceanic Engineering 27, no. 2 (April 2002): 155–69. http://dx.doi.org/10.1109/joe.2002.1002470.

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6

Paduan, Jeffrey D., and Libe Washburn. "High-Frequency Radar Observations of Ocean Surface Currents." Annual Review of Marine Science 5, no. 1 (January 3, 2013): 115–36. http://dx.doi.org/10.1146/annurev-marine-121211-172315.

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7

Andronov, Ivan V., Daniel P. Bouche, and Marc Durufle. "High-Frequency Currents on a Strongly Elongated Spheroid." IEEE Transactions on Antennas and Propagation 65, no. 2 (February 2017): 794–804. http://dx.doi.org/10.1109/tap.2016.2633160.

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8

Bornhold, Brian D., Ping Ren, and David B. Prior. "High-frequency turbidity currents in British Columbia fjords." Geo-Marine Letters 14, no. 4 (December 1994): 238–43. http://dx.doi.org/10.1007/bf01274059.

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9

Czapp, Stanislaw, Krzysztof Dobrzynski, Jacek Klucznik, Zbigniew Lubosny, and Robert Kowalak. "Improving sensitivity of residual current transformers to high frequency earth fault currents." Archives of Electrical Engineering 66, no. 3 (September 1, 2017): 485–94. http://dx.doi.org/10.1515/aee-2017-0036.

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Abstract For protection against electric shock in low voltage systems residual current devices are commonly used. However, their proper operation can be interfered when high frequency earth fault current occurs. Serious hazard of electrocution exists then. In order to detect such a current, it is necessary to modify parameters of residual current devices, especially the operating point of their current transformer. The authors proposed the modification in the structure of residual current devices. This modification improves sensitivity of residual current devices when high frequency earth fault current occurs. The test of the modified residual current device proved that the authors’ proposition is appropriate.
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10

Barth, Alexander, Charles Troupin, Emma Reyes, Aida Alvera-Azcárate, Jean-Marie Beckers, and Joaquín Tintoré. "Variational interpolation of high-frequency radar surface currents using DIVAnd." Ocean Dynamics 71, no. 3 (January 23, 2021): 293–308. http://dx.doi.org/10.1007/s10236-020-01432-x.

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AbstractDIVAnd (Data-Interpolating Variational Analysis, in n-dimensions) is a tool to interpolate observations on a regular grid using the variational inverse method. We have extended DIVAnd to include additional dynamic constraints relevant to surface currents, including imposing a zero normal velocity at the coastline, imposing a low horizontal divergence of the surface currents, temporal coherence and simplified dynamics based on the Coriolis force, and the possibility of including a surface pressure gradient. The impact of these constraints is evaluated by cross-validation using the HF (high-frequency) radar surface current observations in the Ibiza Channel from the Balearic Islands Coastal Ocean Observing and Forecasting System (SOCIB). A small fraction of the radial current observations are set aside to validate the velocity reconstruction. The remaining radial currents from the two radar sites are combined to derive total surface currents using DIVAnd and then compared to the cross-validation dataset and to drifter observations. The benefit of the dynamic constraints is shown relative to a variational interpolation without these dynamical constraints. The best results were obtained using the Coriolis force and the surface pressure gradient as a constraint which are able to improve the reconstruction from the Open-boundary Modal Analysis, a quite commonly used method to interpolate HF radar observations, once multiple time instances are considered together.
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Дисертації з теми "High frequency currents"

1

Kim, Kyung Cheol. "Calibration and validation of high frequency radar for ocean surface current mapping." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FKim.pdf.

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2

Skutt, Glenn R. "High-Frequency Dimensional Effects in Ferrite-Core Magnetic Devices." Diss., Virginia Tech, 1996. http://hdl.handle.net/10919/30596.

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MnZn ferrites are widely used in power electronics applications where the switching frequency is in the range of several tens of kilohertz to a megahertz. In this range of frequencies the combination of relatively high permeability and relatively low conductivity found in MnZn ferrite helps to minimize the size of magnetic devices while maintaining high efficiency. The continuing improvement in semiconductor switches and circuit topologies has led to use of high-frequency switching circuits at ever increasing power levels. The magnetic devices for these high-power, high-frequency circuits require magnetic CORES that are significantly larger than standard ferrite-core devices used at lower power levels. Often such large ferrite cores must be custom designed, and at present this custom design is based on available material information without regard for the physical size of the structure. This thesis examines the issues encountered in the use of larger MnZn ferrite cores for high-frequency, high-power applications. The two main issues of concern are the increased power dissipation due to induced currents in the structure and the change in inductance that results as the flux within the core is redistributed at higher frequencies. In order to model these problems using either numerical or analytical methods requires a reliable and complete set of material information. A significant portion of this work is devoted to methods for acquiring such material information since such information is not generally available from the manufacturers. Once the material constants required for the analysis are determined, they are used in both closed-form and numerical model to illustrate that large ferrite cores suffer significant increases in loss and significant decreases in inductance for frequencies as low as several hundred kilohertz. The separate impacts of the electrical and magnetic losses in the core are illustrated through the use of linear finite element analyses of several example core structures. The device impedances calculated using the FEA tools show fair agreement with measurement. An analysis of gapped structures and segmented cross-sections shows that these design options can reduce the severity of the dimensional problems for some designs.
Ph. D.
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3

Simmons, N. J. "The use of high frequency currents for the electrical stunning of pigs." Thesis, University of Bristol, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336227.

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4

Toh, Kwang Yong Daniel. "Evaluation of surface current mapping performance by SeaSonde High Frequency radar through simulations." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Dec%5FToh.pdf.

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5

Wong, Fu Keung, and n/a. "High Frequency Transformer for Switching Mode Power Supplies." Griffith University. School of Microelectronic Engineering, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050211.110915.

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A power supply is an essential part of all electronic devices. A switching mode power supply is a light weight power solution for most modern electronic equipment. The high frequency transformer is the backbone of modern switched mode power supplies. The skin effect and proximity effects are major problems in high frequency transformer design, because of induced eddy currents. These effects can result in transformers being destroyed and losing their power transferring function at high frequencies. Therefore, eddy currents are unwanted currents in high frequency transformers. Leakage inductance and the unbalanced magnetic flux distribution are two further obstacles for the development of high frequency transformers. Winding structures of power transformers are also a critical part of transformer design and manufacture, especially for high frequency applications. A new planar transformer with a helical winding structure has been designed and can maintain the advantages of existing planar transformers and significantly reduce the eddy currents in the windings. The maximum eddy current density can be reduced to 27% of the density of the planar transformer with meander type winding structure and 33% of the density of the transformer with circular spiral winding structure at an operating frequency of 1MHz. The voltage ratio of the transformer with helical winding structure is effectively improved to 150% of the voltage ratio of the planar transformer with circular spiral coils. With the evenly distributed magnetic flux around the winding, the planar transformer with helical winding structure is excellent for high frequency switching mode power supplies in the 21st Century.
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6

Sefi, Sandy. "Computational electromagnetics : software development and high frequency modeling of surface currents on perfect conductors." Doctoral thesis, KTH, Numerisk Analys och Datalogi, NADA, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-590.

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In high frequency computational electromagnetics, rigorous numerical methods be come unrealistic tools due to computational demand increasing with the frequency. Instead approximations to the solutions of the Maxwell equations can be employed to evaluate th electromagnetic fields. In this thesis, we present the implementations of three high frequency approximat methods. The first two, namely the Geometrical Theory of Diffraction (GTD) and th Physical Optics (PO), are commonly used approximations. The third is a new invention that will be referred to as the Surface Current Extraction-Extrapolation (SCEE). Specifically, the GTD solver is a flexible and modular software package which use Non-Uniform Rational B-spline (NURBS) surfaces to model complex geometries. The PO solver is based on a triangular description of the surfaces and includes fas shadowing by ray tracing as well as contribution from edges to the scattered fields. GTD ray tracing was combined with the PO solver by a well thought-out software architecture Both implementations are now part of the GEMS software suite, the General ElectroMag netic Solvers, which incorporates state-of-the-art numerical methods. During validations both GTD and PO techniques turned out not to be accurate enough to meet the indus trial standards, thus creating the need for a new fast approximate method providing bette control of the approximations. In the SCEE approach, we construct high frequency approximate surface currents ex trapolated from rigourous Method of Moments (MoM) models at lower frequency. T do so, the low frequency currents are projected onto special basis vectors defined on th surface relative to the direction of the incident magnetic field. In such configuration, w observe that each component displays systematic spatial patterns evolving over frequenc in close correlation with the incident magnetic field, thus allowing us to formulate a fre quency model for each component. This new approach is fast, provides good control of th error and represents a platform for future development of high frequency approximations. As an application, we have used these tools to analyse the radar detectability of a new marine distress signaling device. The device, called "Rescue-Wing", works as an inflatabl radar reflector designed to provide a strong radar echo useful for detection and positionin during rescue operations of persons missing at sea.
QC 20101004
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Sefi, Sandy. "Computational electromagnetics : software development and high frequency modelling of surface currents on perfect conductors /." Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-590.

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8

García-Moreno, Aracelys. "Construction of injectable wireless microstimulators based on rectification of volume conducted high frequency currents." Doctoral thesis, Universitat Pompeu Fabra, 2022. http://hdl.handle.net/10803/673986.

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Functional neuromuscular stimulation (FNS) refers to the delivery of electrical stimuli to nerves or muscles to enhance, modify or restore motor functions. Despite their invasiveness, implantable systems for FNS offer key advantages over surface and percutaneous systems in terms of selectivity and safety. Most implantable FNS systems consist of a relatively bulky subcutaneous pulse genera-tor connected through leads to electrodes at the target stimulation sites. In the case of FNS systems for restoring motor functions in patients with paralysis, the leads are long and the electrodes are distributed over large and mobile body parts, thus making them highly invasive and prone to failure. Miniaturized wireless implantable stimulators represent a safer and more reliable alternative. By integrating all the components in the same device, long leads are avoided and minimally invasive implantation procedures are enabled. In this thesis, architectures and construction methods were devised to implement thin (diameter < 1 mm), flexible and biocompatible wireless microstimulators whose operation principle is based in rectifying high frequency currents delivered to tissues by volume conduction. These threadlike devices, which were successfully in vivo assayed, are intended to be deployed by injection forming a dense network of intramuscular addressable stimulators for the development of motor neuroprostheses. They were implemented adapting techniques well accepted in industry to facilitate early clinical adoption. A noteworthy feature of their construction is the inclusion of a biterminal hermetic metallic capsule housing the sophisticated microelectronic circuitry required for their operation. The applicability of the same technology and operation methods to an alternative clinical field was also explored in the scope of this thesis through the development and in vivo assay proof-of-concept novel leadless microstimulators. Furthermore, this thesis has contributed to the development of refined computer models to characterize the stimulation method previously described.
La estimulación neuromuscular funcional (FNS) se refiere a la aplicación de estímulos eléctricos a nervios o músculos para mejorar, modificar o restaurar fun-ciones motoras. A pesar de ser invasivos, los sistemas implantables para FNS ofrecen ventajas en selectividad y seguridad sobre los superficiales y percutáneos. La mayoría de los sistemas FNS implantables consisten en un generador de pulsos subcutáneo relativamente voluminoso conectado por cables a electrodos en los puntos de estimulación. En el caso de sistemas FNS para restaurar funciones motoras en pacientes con parálisis, los cables son largos y los electrodos están distribuidos por partes del cuerpo grandes y móviles, haciéndolos altamente invasivos y propensos a fallar. Estimuladores implantables inalámbricos miniaturizados representan una alternativa más segura y confiable. Al integrar todos los componentes en el mismo dispositivo, se evitan los cables largos y se habilitan procedimientos de implantación mínimamente invasivos. En esta tesis se han diseñado arquitecturas y métodos de construcción para implementar microestimuladores inalámbricos delgados (diámetro < 1 mm), flexibles y biocompatibles basados en la rectificación de corrientes de alta frecuencia aplicadas a los tejidos por conducción volumétrica. Estos dispositivos filiformes, ensayados con éxito in vivo, serían implantados mediante inyección formando una densa red de estimuladores direccionables intramusculares para desarrollar neuroprótesis motoras. Éstos se han implementado adaptando técnicas bien aceptadas en la industria para facilitar la adopción clínica temprana. Una característica notable de su construcción es la inclusión de una cápsula metálica hermética biterminal que aloja los sofisticados circuitos microelectrónicos necesarios para su funcionamiento. La aplicabilidad de la misma tecnología y métodos de operación a un campo clínico alternativo también se ha explorado en esta tesis mediante el desarrollo y prueba de concepto in vivo de novedosos microestimuladores sin cables. Además, esta tesis ha contribuido al desarrollo de modelos informáticos refinados para caracterizar el método de estimulación descrito anteriormente.
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9

Kim, Sung Yong. "Coastal ocean studies in southern San Diego using high-frequency radar derived surface currents." Diss., [La Jolla, Calif.] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3344796.

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Thesis (Ph. D.)--University of California, San Diego, 2009.
Title from first page of PDF file (viewed April 16, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 179-188).
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Enriquez, Andres E. "An investigation of surface current patterns related to upwelling in Monterey Bay, using high frequency radar." Thesis, Monterey, California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1595.

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Approved for public release; distribution is unlimited
High Frequency (HF) radar backscatter instruments are under development and testing in the marine science and defense science communities for their abilities to remotely sense surface parameters in the coastal ocean over large areas. In the Navy context, the systems provide real-time mapping of ocean surface currents and waves critical to characterization and forecasting of the battlespace environment. In this study, HF radar, aircraft and satellite information were used to investigate and describe surface current in Monterey Bay, California, for a period of ten months, from June 01st, 2003 to March 31st, 2004. A network of five CODAR-type HF radar instruments measured hourly surface currents over the bay. The measurements were averaged over one-hour intervals and total surface velocities were mapped on a grid in the Monterey Bay. From the M1 Buoy located in the middle of the bay, an uninterrupted time series of wind intensity and direction was obtained for the whole period. Major upwelling events were observed during the period of June 14 to June 27, July 4 to July 19, August 8 to August 18 and other upwelling events were observed until late October. These periods of upwelling favorable winds are common during summer with durations of 10 to 20 days. Often they are interrupted by periods of relaxation state of just a few days as the winds veer to the northwest or northeast. Cyclonic circulation cells are developed on shore during upwelling conditions and an anticyclonic circulation in the middle of the bay is observed when the wind shifts to the southwest producing a strong flow out of the bay close to the coastline off Point Piǫs. Downwelling conditions are much common less than upwelling, with occurrences during winter and early fall storms with events lasting between two to five days. When the wind blows to the northeast with an intensity of 4 m/s or more for more than 12 hours, a well developed anticyclonic gyre forms in the middle of the bay. This is associated with a strong current, 35 to 40 cm/s, which flushes out in the southern part of the bay close to the coast off Point Piǫs. This flow reverses when the winds veer to the southwest and enter into the Bay with less intensity.
First Lieutenant, Chilean Navy
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Книги з теми "High frequency currents"

1

Tesla, Nikola. Experiments with alternate currents of high potential and high frequency: A lecture delivered before the Institution of Electrical Engineers, London. Hollywood, Calif: Angriff Press, 1986.

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2

Hayatleh, Khaled. High frequency current-mode precision rectifiers. Oxford: Oxford Brookes University, 1996.

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3

Skinner, A. J. Four quadrant inverter technologies for high frequency UPS. Leatherhead, Surrey, England: ERA Technology, 1992.

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4

Itō, Takatoshi. High-frequency contagion of currency crises in Asia. Cambridge, MA: National Bureau of Economic Research, 2002.

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5

Balciūnas, Povilas. Development and investigation of high frequency voltage-current power converters, theory and application: Summary. Kaunas: Republic of Lithuania, Kaunas University of Technology, 1994.

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6

International, High Frequency Power Conversion Conference (2nd 1987 Washington D. C. ). 1987 High Frequency Power Conversion International, Washington, D.C. Ventura, Calif: Intertec Communications, 1987.

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7

International High Frequency Power Conversion Conference. (3rd 1988 San Diego (Calif.)). Technical papers of the third International High Frequency Power Conversion 1988 Conference, May 1-5, 1988, San Diego, California. Ventura: Intertec Communications, 1988.

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8

Prohorov, Viktor. Semiconductor converters of electrical energy. ru: INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/1019082.

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The textbook considers the need, principles and methods of mutual conversion of parameters of electric energy at DC and AC for stationary and Autonomous objects. Features of operation of power electronics elements in specific conditions of their continuous high-frequency switching are described. Low-current control systems that provide the necessary logic for the operation of Executive power devices of converters are considered. A large number of specific practical electrical diagrams of electric energy converters are given. It is intended for students studying in the direction of 13.03.02 "electric power and electrical engineering". It can be useful for graduate students and specialists involved in the development and operation of electric power converters.
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9

Frederick Finch. [from old catalog] Strong. High-Frequency Currents. Franklin Classics Trade Press, 2018.

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Frederick Finch. [from old catalog] Strong. High-Frequency Currents. Franklin Classics Trade Press, 2018.

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Частини книг з теми "High frequency currents"

1

Knobloch, Jan, Radoslav Cipin, and Petr Prochazka. "Measurement of High-Frequency Currents in Power Electronics." In Advances in Intelligent Systems and Computing, 578–85. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65960-2_71.

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2

Liu, Yonggang, Clifford R. Merz, Robert H. Weisberg, Benjamin K. O’Loughlin, and Vembu Subramanian. "Data Return Aspects of CODAR and WERA High-Frequency Radars in Mapping Currents." In Observing the Oceans in Real Time, 227–40. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66493-4_11.

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3

Keller, Reto B. "Decibel." In Design for Electromagnetic Compatibility--In a Nutshell, 23–31. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14186-7_3.

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AbstractThis chapter introduces the topic decibel in a compact form. Decibel is defined as the ratio of two quantities, typically power, voltage, or current. In the field of EMC, the decibel must be understood. One advantage of decibels is that a gain of 10 dB means a gain of 10 dB for current, voltage, and power likewise. This fact helps to prevent misinterpretations and helps to simplify things. This is the main reason why EMC and high-frequency system engineers like to work with decibels.This chapter assumes that values of voltages V [V], currents I [A], power P [W], electric field strengths E [V/m], and magnetic field strength H [A/m] are given as root-mean-square (RMS) values.
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Bunnell, J. Bert. "High-Frequency Ventilation of Infants." In Current Perinatology, 172–201. New York, NY: Springer New York, 1990. http://dx.doi.org/10.1007/978-1-4612-3380-0_12.

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Hillmann, Susanne, Martin H. Schulze, and Henning Heuer. "High-Frequency Eddy Current Techniques." In Handbook of Advanced Non-Destructive Evaluation, 1–28. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-30050-4_49-1.

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Hillmann, Susanne, Martin H. Schulze, and Henning Heuer. "High-Frequency Eddy Current Techniques." In Handbook of Advanced Nondestructive Evaluation, 729–56. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-26553-7_49.

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Zhang, Jun-an, Ruitao Zhang, and Guangjun Li. "High Speed Current Steering D/A Converter." In High-Speed and High-Performance Direct Digital Frequency Synthesizer Design, 67–107. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7266-8_3.

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Sojka, Antonín, Matúš Šedivý, Oleksii Laguta, Andriy Marko, Vinicius T. Santana, and Petr Neugebauer. "High-frequency EPR: current state and perspectives." In Electron Paramagnetic Resonance, 214–52. Cambridge: Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/9781839162534-00214.

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Vélez, Adolfo, and Hans-Walter Glock. "Superconducting Radio-Frequency for High-Current CW Applications." In Synchrotron Light Sources and Free-Electron Lasers, 1–20. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-04507-8_59-1.

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Vélez, Adolfo, and Hans-Walter Glock. "Superconducting Radio-Frequency for High-Current CW Applications." In Synchrotron Light Sources and Free-Electron Lasers, 581–601. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-23201-6_59.

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Тези доповідей конференцій з теми "High frequency currents"

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Moonen, Niek, Frits Buesink, and Frank Leferink. "Current barriers to confine high frequency common mode currents." In 2016 International Symposium on Electromagnetic Compatibility - EMC EUROPE. IEEE, 2016. http://dx.doi.org/10.1109/emceurope.2016.7739295.

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Fribance, Diane Bennett, Hemantha W. Wijesekera, and William J. Teague. "Measurements of hurricane induced high-frequency currents." In OCEANS 2011. IEEE, 2011. http://dx.doi.org/10.23919/oceans.2011.6107107.

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Chang, Guanghong, Ming Li, Ling Zhang, Yonggang Ji, and Junhao Xie. "Measurements of ocean surface currents using shipborne High-Frequency radar." In 2014 IEEE Radar Conference (RadarCon). IEEE, 2014. http://dx.doi.org/10.1109/radar.2014.6875752.

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Bellini, Alberto, Fiorenzo Filippetti, Domenico Casadei, Amine Yazidi, and Gerard Capolino. "Monitoring of Induction Machines currents by high frequency resolution analysis." In Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting. IEEE, 2006. http://dx.doi.org/10.1109/ias.2006.256865.

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Ivo Dolezel, Jiri Skramlik, and Viktor Valouch. "High-frequency parasitic currents in inverter-fed induction motor drives." In 2007 International Conference on Electrical Machines and Systems. IEEE, 2007. http://dx.doi.org/10.1109/icems12746.2007.4411997.

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Tariq, Hanan, and Stanislaw Czapp. "Tripping of F-type RCDs for High-Frequency Residual Currents." In 2021 International Conference on Information and Digital Technologies (IDT). IEEE, 2021. http://dx.doi.org/10.1109/idt52577.2021.9497590.

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Gradinger, Thomas B., Uwe Drofenik, and Filip Grecki. "Enabling foil windings of medium-frequency transformers for high currents." In 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe). IEEE, 2020. http://dx.doi.org/10.23919/epe20ecceeurope43536.2020.9215916.

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Xiaopeng Dong, Shaowei Deng, D. G. Beetner, T. H. Hubing, and T. P. Van Doren. "Determination of high frequency package currents from near-field scan data." In 2005 International Symposium on Electromagnetic Compatibility, 2005. EMC 2005. IEEE, 2005. http://dx.doi.org/10.1109/isemc.2005.1513600.

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Laws, Kenneth, John Vesecky, and Jeffrey D. Paduan. "High frequency radar for coastal marine monitoring of currents and vessels." In 2010 International Waterside Security Conference (WSS). IEEE, 2010. http://dx.doi.org/10.1109/wssc.2010.5730257.

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Boucenna, Nidhal, Sami Hlioui, Bertrand Revol, and Francois Costa. "Modeling of the propagation of high-frequency currents in AC motors." In 2012 International Symposium on Electromagnetic Compatibility - EMC EUROPE. IEEE, 2012. http://dx.doi.org/10.1109/emceurope.2012.6396843.

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Звіти організацій з теми "High frequency currents"

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Vesecky, John F. Mapping of Ocean Surface Currents and Vertical Shear by High Frequency Radar. Fort Belvoir, VA: Defense Technical Information Center, September 1997. http://dx.doi.org/10.21236/ada628156.

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A.A. Litvak, Y. Raitses, and N.J. Fisch. High-frequency Probing Diagnostic for Hall Current Plasma Thrusters. Office of Scientific and Technical Information (OSTI), October 2001. http://dx.doi.org/10.2172/788452.

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Ito, Takatoshi, and Yuko Hashimoto. High Frequency Contagion of Currency Crises in Asia. Cambridge, MA: National Bureau of Economic Research, December 2002. http://dx.doi.org/10.3386/w9376.

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Rubio, Anna, Emma Reyes, Carlo Mantovani, Lorenzo Corgnati, Pablo Lorente, Lohitzune Solabarrieta, Julien Mader, et al. European High Frequency Radar network governance. EuroSea, May 2021. http://dx.doi.org/10.3289/eurosea_d3.4.

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This report describes the governance of the European HF radar network including: the landscape of the Ocean observation networks and infrastructures, the role and links between operators of observational systems and stakeholders, the role and activities of the EuroGOOS HF radar Task Team in building a sound community strategy, the roadmap of the community with current achievements and future work lines.
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Cernosek, R. W. High frequency current sensors using the Faraday effect in optical fibers. Office of Scientific and Technical Information (OSTI), September 1994. http://dx.doi.org/10.2172/10190503.

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Moskalenko, O. L., E. V. Derevyannykh, N. A. Balashova, and R. A. Yaskevich. DEPRESSIVE DISORDERS AMONG STUDENTS OF MEDICAL HIGHER EDUCATIONAL INSTITUTIONS. Science and Innovation Center Publishing House, 2021. http://dx.doi.org/10.12731/2658-4034-2021-12-4-2-382-390.

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The article presents a review of the literature on the current problem of medicine-depressive disorders among medical students. The need to study the problem of depressive disorders among students of medical higher educational institutions is due to their high frequency and negative impact on the quality of life of students.
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Young, Craig. Problematic plant monitoring in Arkansas Post National Memorial: 2006–2019. Edited by Tani Hubbard. National Park Service, July 2021. http://dx.doi.org/10.36967/nrr-2286657.

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Managers are challenged with the impact of problematic plants, including exotic, invasive, and pest plant species. Information on the cover, distribution, and location of these plants is essential for developing risk-based approaches to managing these species. Based on surveys conducted in 2006, 2011, 2015, and 2019, Heartland Network staff and contractors identified a cumulative total of 28 potentially problematic plant taxa in Arkansas Post National Memorial. Of the 23 species found in 2019, we characterized 9 as very low frequency, 7 as low frequency, 5 as medium frequency, and 2 as high frequency. Cover of all species was low with a single species slightly exceeding a 1-acre threshold based on a midpoint estimate. Efforts to control the woody invasive black locust, Chinese privet, and hardy orange appear to have successfully reduced the cover of these plants across the Memorial Unit. Japanese stiltgrass may have been increasing as recently as 2015, but a combination of recent flooding and control efforts may have stemmed the spread of this invasive grass. Efforts to control localized patches of Chinaberry tree also appear to have reduced the cover of this species. Outside of the problematic species currently subject
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Wilson, A. M., and M. C. Kelman. Assessing the relative threats from Canadian volcanoes. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328950.

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This report presents an analysis of the threat posed by active volcanoes in Canada and outlines directives to bring Canadian volcano monitoring and research into alignment with global best practices. We analyse 28 Canadian volcanoes in terms of their relative threat to people, aviation and infrastructure. The methodology we apply to assess volcanic threat was developed by the United States Geological Survey (USGS) as part of the 2005 National Volcano Early Warning System (NVEWS). Each volcano is scored on a number of hazard and exposure factors, producing an overall threat score. The overall threat scores are then assigned to five threat categories ranging from Very Low to Very High. We adjusted the methodology slightly to better suit Canadian volcano conditions by adding an additional knowledge uncertainty score; this does not affect the threat scoring or ranking. Our threat assessment places two volcanoes into the Very High threat category (Mt. Meager and Mt. Garibaldi). Three Canadian volcanoes score in the High threat category (Mt. Cayley, Mt. Price and Mt. Edziza) and two volcanoes score in the Moderate threat category (the Nass River group and Mt. Silverthrone). We compare the ranked Canadian volcanoes to similarly scored volcanoes in the USA and assess the current levels of volcano monitoring against internationally recognised monitoring strategies. We find that even the most thoroughly-studied volcano in Canada (Mt. Meager) falls significantly short of the recommended monitoring level (Mt. Meager is currently monitored at a level commensurate with a Very Low threat edifice, according to NVEWS recommendations). All other Canadian volcanoes are unmonitored (other than falling within a regional seismic network emplaced to monitor tectonic earthquakes). Based on the relative threat and scientific uncertainty surrounding some Canadian volcanoes, we outline five strategies to improve volcano monitoring in Canada and lower the uncertainty about eruption style and frequency: installation of real-time seismic stations at all Very High and High threat volcanoes, comprehensive lithofacies studies at Mt. Garibaldi in order to reduce uncertainty surrounding the frequency and style of volcanism, hazard mapping at Mt. Garibaldi and Mt. Cayley and publication of existing hazard analyses and mapping for Mt. Meager as a comprehensive hazard map, regular satellite-based ground deformation monitoring at all Very High to Moderate threat edifices, and, finally, installation of a landslide detection and alerting system at Mt. Meager.
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Wilson, A. M., and M. C. Kelman. Assessing the relative threats from Canadian volcanoes. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328950.

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This report presents an analysis of the threat posed by active volcanoes in Canada and outlines directives to bring Canadian volcano monitoring and research into alignment with global best practices. We analyse 28 Canadian volcanoes in terms of their relative threat to people, aviation and infrastructure. The methodology we apply to assess volcanic threat was developed by the United States Geological Survey (USGS) as part of the 2005 National Volcano Early Warning System (NVEWS). Each volcano is scored on a number of hazard and exposure factors, producing an overall threat score. The overall threat scores are then assigned to five threat categories ranging from Very Low to Very High. We adjusted the methodology slightly to better suit Canadian volcano conditions by adding an additional knowledge uncertainty score; this does not affect the threat scoring or ranking. Our threat assessment places two volcanoes into the Very High threat category (Mt. Meager and Mt. Garibaldi). Three Canadian volcanoes score in the High threat category (Mt. Cayley, Mt. Price and Mt. Edziza) and two volcanoes score in the Moderate threat category (the Nass River group and Mt. Silverthrone). We compare the ranked Canadian volcanoes to similarly scored volcanoes in the USA and assess the current levels of volcano monitoring against internationally recognised monitoring strategies. We find that even the most thoroughly-studied volcano in Canada (Mt. Meager) falls significantly short of the recommended monitoring level (Mt. Meager is currently monitored at a level commensurate with a Very Low threat edifice, according to NVEWS recommendations). All other Canadian volcanoes are unmonitored (other than falling within a regional seismic network emplaced to monitor tectonic earthquakes). Based on the relative threat and scientific uncertainty surrounding some Canadian volcanoes, we outline five strategies to improve volcano monitoring in Canada and lower the uncertainty about eruption style and frequency: installation of real-time seismic stations at all Very High and High threat volcanoes, comprehensive lithofacies studies at Mt. Garibaldi in order to reduce uncertainty surrounding the frequency and style of volcanism, hazard mapping at Mt. Garibaldi and Mt. Cayley and publication of existing hazard analyses and mapping for Mt. Meager as a comprehensive hazard map, regular satellite-based ground deformation monitoring at all Very High to Moderate threat edifices, and, finally, installation of a landslide detection and alerting system at Mt. Meager.
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Tait, Emma, Pia Ruisi-Besares, Matthias Sirch, Alyx Belisle, Jennifer Pontius, and Elissa Schuett. Technical Report: Monitoring and Communicating Changes in Disturbance Regimes (Version 1.0). Forest Ecosystem Monitoring Cooperative, October 2021. http://dx.doi.org/10.18125/cc0a0l.

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Shifts in disturbance patterns across the Northeast are of increasing concern as the climate continues to change. In particular, changes in patterns of frequency, severity and extent of disturbance event may have detrimental cascading impacts on forest ecosystems and human communities. To explore how changing disturbance regimes might impact future forest health and management it is necessary to understand the historical trends and impacts of disturbance in the region. Although individual types of disturbance have already been analyzed, there is a need for a consolidated overview of the current state of disturbance in northeastern forests. To address this need, the Forest Ecosystem Monitoring Cooperative (FEMC) developed the FEMC: Tracking Shifts in Disturbance Regimes web portal for users to explore changes over time of key disturbance drivers, identify important disturbance responses, and discover where monitoring is happening for both drivers and responses. In collaboration with our advisory committee, we identified key disturbance drivers—flood, high winds, fire, drought, pests—and responses—macroinvertebrates, cold-water fisheries, invasive plants—that are of particular concern in the region. For each of the drivers we identified a suitable regional dataset and analyzed changes over time in frequency, severity, and extent. We also created a structured framework to catalogue programs across the region that are monitoring for these disturbance drivers and responses. Version 1.0 of the FEMC: Tracking Shifts in Disturbance Regimes (https://uvm.edu/femc/disturbance) web portal, first released in October 2021, contains 272 data programs, 11 drivers and three responses. Through the web portal users can browse programs by state, driver type or response type, and explore where monitoring is happening across the region. Driver-specific analyses allow users to quickly see the trends in severity, frequency and extent of selected disturbances and compare the impacts in selected states to regional data. We hope that this collection of programs and the analysis of trends provide researchers and land managers with an easy way to understand the current state of disturbance in northeastern forests that enables them to analyze and plan for future impacts.
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