Готові списки джерел за темами / 30-sided space vector structure

Добірка наукової літератури з теми "30-sided space vector structure"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "30-sided space vector structure"

R, Rakesh, Krishna Raj Ramachandran, Apurv Kumar Yadav, K. Gopakumar, Loganathan Umanand, and Kouki Matsuse. "A Switched Capacitive Filter-Based Harmonic Elimination Technique by Generating a 30-Sided Voltage Space Vector Structure for IM Drive." IEEE Transactions on Power Electronics 35, no. 3 (March 2020): 2402–10. http://dx.doi.org/10.1109/tpel.2019.2930280.

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Jiménez Fernández, E., та E. A. Sánchez Pérez. "Lattice Copies ofℓ2inL1of a Vector Measure and Strongly Orthogonal Sequences". Journal of Function Spaces and Applications 2012 (2012): 1–15. http://dx.doi.org/10.1155/2012/357210.

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Letmbe anℓ2-valued (countably additive) vector measure and consider the spaceL2(m) of square integrable functions with respect tom. The integral with respect tomallows to define several notions of orthogonal sequence in these spaces. In this paper, we center our attention in the existence of stronglym-orthonormal sequences. Combining the use of the Kadec-Pelczyński dichotomy in the domain space and the Bessaga-Pelczyński principle in the range space, we construct a two-sided disjointification method that allows to prove several structure theorems for the spacesL1(m) andL2(m). Under certain requirements, our main result establishes that a normalized sequence inL2(m) with a weakly null sequence of integrals has a subsequence that is stronglym-orthonormal inL2(m∗), wherem∗is anotherℓ2-valued vector measure that satisfiesL2(m) = L2(m∗). As an application of our technique, we give a complete characterization of when a space of integrable functions with respect to anℓ2-valued positive vector measure contains a lattice copy ofℓ2.

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Raj R, Krishna, K. Gopakumar, Apurv Kumar Yadav, L. Umanand, Mariusz Malinowski, and Wojciech Jarzyna. "A Twelve Concentric Multilevel Twenty-Four Sided Polygonal Voltage Space Vector Structure for Variable Speed Drives." IEEE Transactions on Power Electronics 34, no. 10 (October 2019): 9906–15. http://dx.doi.org/10.1109/tpel.2019.2892329.

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Saikia, D. J., W. Junor, T. J. Cornwell, T. W. B. Muxlow, and P. Shastri. "A VLA and MERLIN study of extragalactic radio sources with one-sided structure." Monthly Notices of the Royal Astronomical Society 245, no. 3 (August 1, 1990): 408. http://dx.doi.org/10.1093/mnras/245.3.408.

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Summary To investigate the nature of extragalactic radio sources with extended emission on only one side of the active nucleus, we have observed a sample of suspected candidates with both the VLA and MERLIN. In this paper, we present observations of 13 sources which were either suspected of being ‘one-sided’ or were known to have lobes of very different surface brightnesses. Many of the candidates were found to have emission on both sides of the nucleus. Using our observations as well as those available in the literature, we have compiled a sample of 4C quasars having one-sided radio structure. We have then compared some of their properties with a sample of 4C quasars which are two-sided, in order to determine whether their apparently onesided structure is due to relativistic beaming in sources inclined at small angles to the line-of-sight. We find that the median values of fc, the fraction of emission from the core used as a statistical measure of source orientation, and l, their projected linear sizes are consistent with the hypothesis that the one-sided quasars are seen at smaller angles to the line-of-sight than the two-sided ones. We also suggest that the ϕ-fc relation for quasars, where ϕ is the angle between the core polarization vector and the overall radio axis, is consistent with this model, and discuss how the lobe depolarization properties may be useful for further investigations of this interpretation. The velocities required to explain the apparently one-sided quasars in the relativistic beaming framework are in the range of ˜ 0.2-0.8 c. The scarcity of highluminosity, Fanaroff-Riley class II radio galaxies with one-sided structure is consistent with the suggestion that they are at larger angles to the line-of-sight than quasars. In this case, the core-dominated radio galaxies are possibly the lowluminosity, Fanaroff-Riley class I radio galaxies seen at small angles to the line-ofsight, manifesting themselves as BL Lac objects in the more extreme cases.

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Krishna, Raj R., K. Gopakumar, Mathews Boby, Apurv Kumar Yadav, Leopoldo Garcia Franquelo, and Sheldon S. Williamson. "Multilevel 24-Sided Polygonal Voltage-Space-Vector Structure Generation for an IM Drive Using a Single DC Source." IEEE Transactions on Industrial Electronics 66, no. 2 (February 2019): 1023–31. http://dx.doi.org/10.1109/tie.2018.2831189.

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Yadav, Apurv Kumar, Mathews Boby, Sumit Kumar Pramanick, K. Gopakumar, Loganathan Umanand, and Leopoldo G. Franquelo. "Generation of High-Resolution 12-Sided Voltage Space Vector Structure Using Low-Voltage Stacked and Cascaded Basic Inverter Cells." IEEE Transactions on Power Electronics 33, no. 9 (September 2018): 7349–58. http://dx.doi.org/10.1109/tpel.2017.2764541.

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Mendes-Gonçalves, Suzana, and R. P. Sullivan. "The Ideal Structure of Semigroups of Linear Transformations with Lower Bounds on Their Nullity or Defect." Algebra Colloquium 17, no. 01 (March 2010): 109–20. http://dx.doi.org/10.1142/s1005386710000131.

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Suppose V is an infinite-dimensional vector space and let T(V) denote the semigroup (under composition) of all linear transformations of V. In this paper, we study the semigroup OM(p,q) consisting of all α ∈ T(V) for which dim ker α ≥ q and the semigroup OE(p,q) of all α ∈ T(V) for which codim ran α ≥ q, where dim V = p ≥ q ≥ ℵ0. It is not difficult to see that OM(p,q) and OE(p,q) are a right ideal and a left ideal of T(V), respectively, and using these facts, we show that they belong to the class of all semigroups whose sets of bi-ideals and quasi-ideals coincide. Also, we describe Green's relations and the two-sided ideals of each semigroup, and determine its maximal regular subsemigroup. Finally, we determine some maximal right cancellative subsemigroups of OE(p,q).

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Lepoittevin, Christophe, and Olivier Leynaud. "Resolution of a modulated structure by electron and powder X-ray diffraction." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C928. http://dx.doi.org/10.1107/s2053273314090718.

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These past few years, many new structures have been solved using electron diffraction methods: zone axis precession electron diffraction (PED) and tomography in reciprocal space. Both methods enable to reduce importantly the multiple scattering, so that the reflection intensities can be used for structure determination by direct methods. The ferrite Sr25Fe30O77 belongs to a family of phases whose structures consist of an intergrowth of m perovskite layers with complex rocksalt type layers [1,2]. The compound of interest is the member m = 4 of this family and its structure has been solved by combining both electron diffraction methods cited above. This oxide crystallizes in an orthorhombic system with the sub-cell parameters a ≍ b ≍ 5.4 Å and c ≍ 42 Å in a F type lattice. The structure exhibits modulation along a axis with a modulation vector q = 2/5 a. The commensurate nature of the modulation enables to describe the structure in a supercell with the cell parameters a ≍ 27 Å, b ≍ 5.4 Å and c ≍ 42 Å. PED patterns were recorded in zone axis with a Spinning Star unit using a precession angle of 20. The intensities were extracted with CRISP software and the resulting dataset was then implemented in SIR2008 for structure solution. The tomography data collection, recorded by tilting manually every 0.5 degree from -30 to +30 degrees, was inserted in a "3D Electron Diffraction Tomography" software, which reconstructs the 3D reciprocal space and extracts automatically the reflection intensities. The intensity file was then used on SIR2008 for structure determination. In order to confirm and refine the structural model, a powder X-ray diffraction pattern was performed on a laboratory diffractometer with Cu Ka1 radiation. Cell parameters were refined with the WinPlotr and FullProf Softwares using both LeBail and Rietveld methods [3]. The structural model obtained with electron diffraction data was tried and confirmed as the correct structure by the Rietveld refinements.

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Stepan, Vasyliv, and Ternova Kateryna. "Study of the flow structure during the injection of detonation products into the supersonic nozzle." System technologies 2, no. 145 (May 11, 2023): 11–18. http://dx.doi.org/10.34185/1562-9945-2-145-2023-02.

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The gradual unloading of the space stage by undocking objects from it or an emer-gency situation due to the undocking of one of the spacecraft leads to mass asymmetry. In outer space there is also the problem of the collision of a space object with elements of space debris. Therefore, the relevance of the topic of this work is determined by the need to develop a system for avoiding the collision of a rocket with elements of space de-bris and controlling the flight, observing the programmed trajectory of movement. The gas-dynamic aircraft system is characterized by the highest speed control. Injection of detonation products into the supercritical part of the nozzle was used as a gas-dynamic system. Modeling was carried out in the SolidWorks application software package. The purpose of the work is to develop alternative methods of the thrust vector control of the upper stage rocket engine. The scheme of the system for the thrust vector control of a rocket engine by the effect of a detonation wave on the gas flow in its nozzle has been developed. The simulation was carried out in a non-stationary flat model at angles to the axis of the combustion chamber of 90°, 60°, 45°, 30° and parallel to the axis, - 0°. The location of the detonation gas generator was near the nozzle section. Numerical simulation revealed that the impact of the detonation wave on the main gas flow in the nozzle causes two power factors. The first force factor is due to the reactive force when detonation products are thrown into the nozzle and on the wall of the high pressure zone where the detonation gas generator is located. The second force factor is due to the change in pressure distribution on the nozzle surface, where high pressure zone creates reflecting on it. The dependence of the relative lateral force on the injection angle of detonation products into the combustion chamber over time has been obtained. The structure of the flow according to the patterns of the velocity distribution in the nozzle during the injection of detonation products is also considered. In cases when the injec-tion is blown at 900 and 450, the release of detonation products initiates a shock wave of high intensity, which moves against the supersonic flow, retarding it. The developed scheme can be used for maneuvering the upper stage of a prospective launch vehicle to avoid its collision with elements of space debris.

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Belenkaya, E. S., I. I. Alexeev, M. S. Blokhina, S. W. H. Cowley, S. V. Badman, V. V. Kalegaev, and M. S. Grigoryan. "IMF dependence of the open-closed field line boundary in Saturn's ionosphere, and its relation to the UV auroral oval observed by the Hubble Space Telescope." Annales Geophysicae 25, no. 5 (June 4, 2007): 1215–26. http://dx.doi.org/10.5194/angeo-25-1215-2007.

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Abstract. We study the dependence of Saturn's magnetospheric magnetic field structure on the interplanetary magnetic field (IMF), together with the corresponding variations of the open-closed field line boundary in the ionosphere. Specifically we investigate the interval from 8 to 30 January 2004, when UV images of Saturn's southern aurora were obtained by the Hubble Space Telescope (HST), and simultaneous interplanetary measurements were provided by the Cassini spacecraft located near the ecliptic ~0.2 AU upstream of Saturn and ~0.5 AU off the planet-Sun line towards dawn. Using the paraboloid model of Saturn's magnetosphere, we calculate the magnetospheric magnetic field structure for several values of the IMF vector representative of interplanetary compression regions. Variations in the magnetic structure lead to different shapes and areas of the open field line region in the ionosphere. Comparison with the HST auroral images shows that the area of the computed open flux region is generally comparable to that enclosed by the auroral oval, and sometimes agrees in detail with its poleward boundary, though more typically being displaced by a few degrees in the tailward direction.

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Частини книг з теми "30-sided space vector structure"

Zhang, Haokun, Daotong Li, and Zhihui Wang. "Compact High-Efficiency Broadband Microwave Rectifier for Free-Space RF Energy Harvesting." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220267.

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This paper presents a compact high-efficiency broadband microwave rectifier for free-space Radio Frequency (RF) energy harvesting. Lumped-element components and voltage-doubling circuits are used to improve output efficiency and power, widen frequency bandwidth, and reduce circuit size. The theoretical model and numerical model of the rectifier circuit are established, and the mechanism of the microwave voltage-doubling rectifier is revealed by using Advanced Design System (ADS) EM simulator. The simulated results exhibit that the rectification efficiency is larger than 60% with the highest efficiency of 84% under the input power of 16 dBm–30 dBm and the frequency of 600 MHz–1600 MHz. Moreover, the overall size is 4 cm × 2 cm, smaller than some recently published literatures, proving the circuit structure’s superiority. On this basis, for the lower operating frequency band, the circuit structure is further simplified without reducing bandwidth and efficiency by reducing the number of circuit components, and the overall size is only 2 cm × 2 cm. For validation, two broadband rectifiers fabricated by utilizing FR4 dielectric substrate and Printed Circuit Board (PCB) technology, are implemented and tested using Vector Signal Generator (VSG), DC resistance, and multimeter. The measure results are in good agreement with simulation ones within the measuring range of the equipment.

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Тези доповідей конференцій з теми "30-sided space vector structure"

Rakesh, R., Mriganka Ghosh Majumder, K. Gopakumar, Loganathan Umanand, Leopoldo G. Franquelo, and Wojciech Jarzyna. "A Fifteen Concentric 30-sided Polygonal Space Vector Structure Using a Single DC-link for OEIM drive." In 2020 IEEE 29th International Symposium on Industrial Electronics (ISIE). IEEE, 2020. http://dx.doi.org/10.1109/isie45063.2020.9152382.

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R, Rakesh, Mriganka Ghosh Majumder, K. Gopakumar, L. Umanand, Dariusz Zieliski, and Leopoldo Garcia Franquelo. "A Multilevel 30-sided Space Vector Structure Generation for an Induction Motor Drive Using a Single DC-link." In IECON 2020 - 46th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2020. http://dx.doi.org/10.1109/iecon43393.2020.9254943.

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R., Rakesh, Apurv Kumar Yadav, Krishna Raj R., K. Gopakumar, and L. Umanand. "A 30-sided polygonal space vector structure with modular low voltage capacitor fed cascaded H bridge for IM drive." In 2019 IEEE 28th International Symposium on Industrial Electronics (ISIE). IEEE, 2019. http://dx.doi.org/10.1109/isie.2019.8781446.

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Krishna Raj, R., K. Gopakumar, Apurv Kumar Yadav, L. Umanand, Mariusz Malinowski, and Wojciech Jarzyna. "A Thirteen Level Twenty-Four Sided Polygonal Voltage Space Vector Structure for Drives." In IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2018. http://dx.doi.org/10.1109/iecon.2018.8591564.

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Raj, R. Krishna, K. Gopakumar, Mathews Boby, Apurv Kumar Yadav, Leopoldo G. Franquelo, and Sheldon Williamson. "Six concentric multilevel twenty-four sided voltage space vector structure for IM drives." In IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2017. http://dx.doi.org/10.1109/iecon.2017.8216366.

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Imthias, Mohammed, R. Rakesh, K. Gopakumar, L. Umanand, and Ruman Kalyan Mahapatra. "Variable Speed Induction Motor Drive Scheme with Very Dense 18-sided Voltage Space Vector Structure." In 2022 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2022. http://dx.doi.org/10.1109/apec43599.2022.9773391.

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Das, A., K. Sivakumar, G. Mondal, and K. Gopakumar. "A Multilevel inverter with hexagonal and 12-sided polygonal space vector structure for induction motor drive." In IECON 2008 - 34th Annual Conference of IEEE Industrial Electronics Society. IEEE, 2008. http://dx.doi.org/10.1109/iecon.2008.4758104.

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Surana, Prashant, Rakesh R, K. Gopakumar, and Loganathan Umanand. "A 24-sided Polygonal Voltage Space Vector Structure for IM drive with Open end winding Configuration." In IECON 2021 - 47th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2021. http://dx.doi.org/10.1109/iecon48115.2021.9589640.

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Gudapati, Tanvi, and P. P. Rajeevan. "20-Sided Polygonal Voltage Space Vector Structure Based Switching Scheme for Five Phase Induction Motor Drives." In 2021 IEEE 2nd International Conference on Smart Technologies for Power, Energy and Control (STPEC). IEEE, 2021. http://dx.doi.org/10.1109/stpec52385.2021.9718710.

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Shekhar, Ishank, and P. P. Rajeevan. "Generation of 24-Sided Polygonal Voltage Space Vector Structure with Reduced Hardware Complexity for Induction Motor Drives." In 2022 IEEE International Conference on Power Electronics, Smart Grid, and Renewable Energy (PESGRE). IEEE, 2022. http://dx.doi.org/10.1109/pesgre52268.2022.9715925.

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