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Journal articles on the topic '30-sided space vector structure'

Author: Grafiati

Published: 6 September 2023

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1

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 (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 req

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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 (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 (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

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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 (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 (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 (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 re

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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 (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 co

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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 (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. In

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Belenkaya, E. S., I. I. Alexeev, M. S. Blokhina, et al. "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 (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 paraboloi

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Pegram, G. G. S., and A. N. Clothier. "Downscaling rainfields in space and time, using the String of Beads model in time series mode." Hydrology and Earth System Sciences 5, no. 2 (2001): 175–86. http://dx.doi.org/10.5194/hess-5-175-2001.

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Abstract. The String of Beads model is a space-time model of rainfields measured by weather radar. It is here driven by two auto-regressive time series models, one at the image scale, the other at the pixel scale, to model the temporal correlation structure of the wet-period process. The marginal distribution of the pixel scale intensities on a given radar-rainfall image is described by a log-normal distribution. The spatial dependence structure of each image is defined by a power spectrum approximated by a power law function with a negative exponent. It is demonstrated that this stochastic mo

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Kuang, Wenhui, Shu Zhang, Xiaoyong Li, and Dengsheng Lu. "A 30 m resolution dataset of China's urban impervious surface area and green space, 2000–2018." Earth System Science Data 13, no. 1 (2021): 63–82. http://dx.doi.org/10.5194/essd-13-63-2021.

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Abstract. Accurate and timely maps of urban underlying land properties at the national scale are of significance in improving habitat environment and achieving sustainable development goals. Urban impervious surface (UIS) and urban green space (UGS) are two core components for characterizing urban underlying environments. However, the UIS and UGS are often mosaicked in the urban landscape with complex structures and composites. The “hard classification” or binary single type cannot be used effectively to delineate spatially explicit urban land surface property. Although six mainstream datasets

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Bandoli, Giuliano, Jan Bergman, Kurt J. Irgolic, Antonio Grassi, and Giuseppe C. Pappalardo. "Solid State and Solution Conformation of Di-2-thienyl Telluride: X-Ray Structure and Dipole Moment Studies." Zeitschrift für Naturforschung B 40, no. 9 (1985): 1157–60. http://dx.doi.org/10.1515/znb-1985-0911.

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The crystal and molecular structure of di-2-thienyl telluride was determined by X-ray analysis. Crystal (monoclinic) data were: a = 9.526(4), b = 6.252(4), c - 16.302(5) Å; β = 97.29(3)°, Z = 4, space group P21/c. Hydrogen bonds are absent and only van der Waals forces are determining crystal packing. The Cring-Te bond distances suggest little conjugation of Te atom with the rings. Comparisons with published structures for Car-X-Car (X = chalcogen) type molecules revealed that the C (l)-Te-C(5) angle takes the lowest value (95.6°) in the molecule understudy. The remaining bond lengths and angl

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Sato, Taku, Yusuke Nambu, Tao Hong, et al. "Magnetic structure of the chiral triangular magnet MnSb2O6." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C387. http://dx.doi.org/10.1107/s2053273314096120.

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Incommensurate helical (or cycloidal) magnetic structure may have left- and right-wound states (helicity), which are in principle equally populated in a magnet with inversion symmetry. In addition, for a Heisenberg triangular antiferromagnet, clockwise and counter-clockwise rotations of the 120 degree spin structure provide another intriguing degree of freedom. Hence, a triangular magnet that has incommensurate helical ordering along the stacking direction will show intriguing interplay of the helicity (of the helical structure) and chirality (in the triangular plane). Such phenomenon is, howe

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Wang, Xueyuan, Hongpo Zhang, Zongmin Wang, Yaqiong Qiao, Jiangtao Ma, and Honghua Dai. "Con&Net: A Cross-Network Anchor Link Discovery Method Based on Embedding Representation." ACM Transactions on Knowledge Discovery from Data 16, no. 2 (2022): 1–18. http://dx.doi.org/10.1145/3469083.

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Cross-network anchor link discovery is an important research problem and has many applications in heterogeneous social network. Existing schemes of cross-network anchor link discovery can provide reasonable link discovery results, but the quality of these results depends on the features of the platform. Therefore, there is no theoretical guarantee to the stability. This article employs user embedding feature to model the relationship between cross-platform accounts, that is, the more similar the user embedding features are, the more similar the two accounts are. The similarity of user embeddin

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Neneng, Neneng, Kusworo Adi, and Rizal Isnanto. "Support Vector Machine Untuk Klasifikasi Citra Jenis Daging Berdasarkan Tekstur Menggunakan Ekstraksi Ciri Gray Level Co-Occurrence Matrices (GLCM)." JURNAL SISTEM INFORMASI BISNIS 6, no. 1 (2016): 1. http://dx.doi.org/10.21456/vol6iss1pp1-10.

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Texture is one of the most important features for image analysis, which provides informations such as the composition of texture on the surface structure, changes of the intensity, or brightness. Gray level co-occurence matrix (GLCM) is a method that can be used for statistical texture analysis. GLCM has proven to be the most powerful texture descriptors used in image analysis. This study uses the four-way GLCM 0o, 45o, 90o, and 135o. Support vector machine (SVM) is a machine learning that can be used for image classification. SVM has a high generalization capability without any requirement of

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Wu, Yue-Liang. "Theory of quantum gravity beyond Einstein and space-time dynamics with quantum inflation." International Journal of Modern Physics A 30, no. 28n29 (2015): 1545002. http://dx.doi.org/10.1142/s0217751x15450025.

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In this talk, I present a theory of quantum gravity beyond Einstein. The theory is established based on spinnic and scaling gauge symmetries by treating the gravitational force on the same footing as the electroweak and strong forces. A bi-frame space-time is initiated to describe the laws of nature. One frame space-time is a globally flat coordinate Minkowski space-time that acts as an inertial reference frame for the motions of fields, the other is a locally flat non-coordinate Gravifield space-time that functions as an interaction representation frame for the degrees of freedom of fields. T

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Berestova, T. F., and A. V. Mikhailova. "Methodology of a spatial approach in library science: prevalence and specificity of applying." Bibliosphere, no. 4 (December 30, 2017): 51–61. http://dx.doi.org/10.20913/1815-3186-2017-4-51-61.

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Space is one of the basic categories of philosophy having extensive operational and analytical capabilities. Nowadays the specificity of different types of spaces is studied, and the methodology of a spatial approach has become recognized as an effective method of knowledge in various sciences: philosophy, philology, pedagogics and psychology, political science, sociology, art history and cultural studies, economics and law, technical and natural sciences (physics, mathematics, biology, chemistry). As a special tool, the spatial approach is included in the scientific-educational store of docum

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Bondar, V. S., D. R. Abashev, and D. Yu Fomin. "COMPARATIVE ANALYSIS OF PLASTICITY THEORIES UNDER COMPLEX LOADING." Problems of Strength and Plasticity 84, no. 4 (2022): 493–510. http://dx.doi.org/10.32326/1814-9146-2022-84-4-493-510.

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Variants of theories of plastic flow under combined hardening, widely used in practical calculations of structures, are considered. A comparative analysis of the variants of theories under complex loading along plane and spatial deformation trajectories is carried out, covering a wide range of trajectories from multi-link polylines to curved trajectories of variable curvature and torsion. Trajectories from medium to large curvature and torsion are considered. The analysis of the research results is carried out in the vector space of A.A. Ilyushin. The plane trajectories of deformations in the

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Bondar, V. S., D. R. Abashev, and D. Ju Fomin. "Theories of plasticity under complex loading along flat trajectories of deformations." PNRPU Mechanics Bulletin, no. 3 (December 15, 2021): 35–47. http://dx.doi.org/10.15593/perm.mech/2021.3.04.

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The paper considers variants of theories of plastic flow with combined hardening, which are widely used in applied calculations of structures. A comparative analysis of the theories under complex loading along flat strain trajectories is carried out and covers the entire range of strain paths from multilink polylines to curved trajectories of constant and variable curvatures. The strain path from medium to large curvatures are considered. The analysis of the research results is carried out in the vector space of A.A. Il’yushin. We consider plane trajectories of deformations in the form of a sq

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Okunev, I., and V. Vinogradov. "Regional Security Complexes (Spatial Autocorrelation and Cluster Analysis Stimulation)." World Economy and International Relations 65, no. 4 (2021): 30–41. http://dx.doi.org/10.20542/0131-2227-2021-65-4-30-41.

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Received 23.03.2020. Security studies are going through a new stage of development. The 20th century was marked by scientific discussions about globalization itself and its possible impact on international security, the need to adjust concepts and methodologies. Many modern challenges are a direct consequence of increased global interdependence. At the same time, global attention is shifting towards regions, because the processes originating there can explain and determine the structure of international security. In turn, it is vital to adopt the knowledge and methodology of regional studies a

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du Plessis, Louis, Christo Venter, Zorawar Wadiasingh, et al. "Probing the non-thermal emission geometry of AR Sco via optical phase-resolved polarimetry." Monthly Notices of the Royal Astronomical Society 510, no. 2 (2021): 2998–3010. http://dx.doi.org/10.1093/mnras/stab3595.

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ABSTRACT AR Sco is a binary system that contains a white and red dwarf. The rotation rate of the white dwarf (WD) has been observed to slow down, analogous to rotation-powered radio pulsars; it has thus been dubbed a ‘white dwarf pulsar’. We previously fit the traditional radio pulsar rotating vector model to the linearly polarized optical data from this source, constraining the system geometry as well as the WD mass. Using a much more extensive data set, we now explore the application of the same model to binary phase-resolved optical polarimetric data, thought to be the result of non-thermal

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Vollmer, B., C. Pappalardo, M. Soida, and A. Lançon. "Two uneven sisters." Astronomy & Astrophysics 620 (December 2018): A108. http://dx.doi.org/10.1051/0004-6361/201731910.

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Since the Virgo cluster is the closest galaxy cluster in the northern hemisphere, galaxy interactions can be observed in it at kiloparsec resolution. The spiral galaxy NGC 4388 underwent a ram-pressure stripping event ∼200 Myr ago caused by its highly eccentric orbit within the Virgo cluster. This galaxy fulfills all diagnostic criteria for having undergone active ram-pressure stripping in the recent past: it has a strongly truncated HI and Hα disk, an asymmetric ridge of polarized radio continuum emission, extended extraplanar gas toward the opposite side of the ridge of polarized radio conti

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Gogoleva, Elena. "Information Policy of Local Authority in Internet as a Factor of Societal Regulation: Sociological Analysis." Logos et Praxis, no. 2 (October 2022): 81–90. http://dx.doi.org/10.15688/lp.jvolsu.2022.2.9.

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Influence of information on the social management is constantly increasing. Information policy in Russian local self-government system is a given of maintaining significant social relationships in municipality and a factor of the development of civil society. The interactive information policy contributes to the preservation of sensed-presence effect of local community in the public area, and to the setting new goals of the municipal development. Research problem is the lack of actual sociological facts about the abilities and limitations of organization and implementation of local information

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CHURIKANOVA, Olena, and Oksana DENYSENKO. "CIRCULAR ECONOMY – THE FUTURE OF SUSTAINABLE DEVELOPMENT." Herald of Khmelnytskyi National University. Economic sciences 312, no. 6(1) (2022): 202–7. http://dx.doi.org/10.31891/2307-5740-2022-312-6(1)-30.

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The work is devoted to the analysis of the main principles and approaches to the introduction of the circular economy concept at the state level. The article contains both the theoretical foundations of the introduction of the circular economy, the conceptual apparatus and the analysis of practical cases of the successful introduction of the principles in the global space. In addition, the main problems that may stand in the way of the successful implementation of the circular economy at the state level are outlined. The paper considers the main aspects of the introduction of the concept of ci

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Orienti, M., G. Migliori, G. Brunetti, et al. "Jansky VLA observations of synchrotron emitting optical hotspots of 3C 227 and 3C 445 radio galaxies." Monthly Notices of the Royal Astronomical Society 494, no. 2 (2020): 2244–53. http://dx.doi.org/10.1093/mnras/staa777.

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ABSTRACT We report results on deep Jansky Very Large Array (VLA) A-configuration observations at 22 GHz of the hotspots of the radio galaxies 3C 227 and 3C 445. Synchrotron emission in the optical on scales up to a few kpc was reported for the four hotspots. Our VLA observations point out the presence of unresolved regions with upper limit to their linear size of about 100 pc. This is the first time that such compact components in hotspots have been detected in a mini-sample, indicating that they are not a peculiar characteristic of a few individual hotspots. The polarization may reach values

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Pötzl, F. M., A. P. Lobanov, E. Ros, et al. "Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron." Astronomy & Astrophysics 648 (April 2021): A82. http://dx.doi.org/10.1051/0004-6361/202039493.

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Context. Supermassive black holes in the centres of radio-loud active galactic nuclei (AGN) can produce collimated relativistic outflows (jets). Magnetic fields are thought to play a key role in the formation and collimation of these jets, but the details are much debated. Aims. We study the innermost jet morphology and magnetic field strength in the AGN 3C 345 with an unprecedented resolution using images obtained within the framework of the key science programme on AGN polarisation of the Space VLBI mission RadioAstron. Methods. We observed the flat spectrum radio quasar 3C 345 at 1.6 GHz on

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Marton, G., P. Ábrahám, E. Szegedi-Elek, et al. "Identification of Young Stellar Object candidates in the Gaia DR2 x AllWISE catalogue with machine learning methods." Monthly Notices of the Royal Astronomical Society 487, no. 2 (2019): 2522–37. http://dx.doi.org/10.1093/mnras/stz1301.

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ABSTRACT The second Gaia Data Release (DR2) contains astrometric and photometric data for more than 1.6 billion objects with mean Gaia G magnitude &lt;20.7, including many Young Stellar Objects (YSOs) in different evolutionary stages. In order to explore the YSO population of the Milky Way, we combined the Gaia DR2 data base with Wide-field Infrared Survey Explorer (WISE) and Planck measurements and made an all-sky probabilistic catalogue of YSOs using machine learning techniques, such as Support Vector Machines, Random Forests, or Neural Networks. Our input catalogue contains 103 million

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Zou, Yajie, Xuedong Hua, Yanru Zhang, and Yinhai Wang. "Hybrid short-term freeway speed prediction methods based on periodic analysis." Canadian Journal of Civil Engineering 42, no. 8 (2015): 570–82. http://dx.doi.org/10.1139/cjce-2014-0447.

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Short-term traffic speed forecasting is an important issue for developing Intelligent Transportation Systems applications. So far, a number of short-term speed prediction approaches have been developed. Recently, some multivariate approaches have been proposed to consider the spatial and temporal correlation of traffic data. However, as traffic data often demonstrates periodic patterns, the existing methodologies often fail to take into account spatial and temporal information as well as the periodic features of traffic data simultaneously in the multi-step prediction. This paper comprehensive

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Chandrasenan, Archa, and Joseph Zacharias. "Non-linear photonic loop mirror based co-site interference canceller." Laser Physics Letters 19, no. 11 (2022): 116207. http://dx.doi.org/10.1088/1612-202x/ac9679.

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Abstract Full duplex-in band (FDIB) is a well-established solution for increasing the data rate and spreading the link range for future communication systems. FDIB systems need no additional bandwidth requirement. However, they are confronted with a major interference challenge on the same site, called co-site interference (CSI). Long-established co-site interference cancellation (CSIC) methods achieve a cancellation depth upto 35 dB, conversely it has space containments, manufacturing imperfections, induces noise penalties and limits isolation bandwidth. To overcome these problems, RF photoni

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Poveschenko, Yuri Andreevich, Alexander Yur’evich Krukovskiy, Dmitri Sergeevich Boykov, Victoria Olegovna Podryga, and Parvin Ilgar gizi Rahimly. "Three-dimensional modeling of hydrodynamic problems taking into account elastic processes." Keldysh Institute Preprints, no. 30 (2021): 1–15. http://dx.doi.org/10.20948/prepr-2021-30.

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A finite-difference approximation of elastic forces on spaced Lagrangian grids is constructed, based on the method of support operators. For displacement vectors on irregular grids, on the topological and geometric structure of which minimal reasonable restrictions are imposed, the approximations of vector analysis operations are constructed in relation to difference schemes for problems of elasticity theory. Taking into account the energy balance of the medium, the constructed families of integrally consistent approximations of vector analysis operations are sufficient for discrete modeling o

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Kuo, F. S., H. Y. Lue, C. L. Fern, J. Röttger, S. Fukao, and M. Yamamoto. "Statistical characteristics of AGW wave packet propagation in the lower atmosphere observed by the MU radar." Annales Geophysicae 27, no. 10 (2009): 3737–53. http://dx.doi.org/10.5194/angeo-27-3737-2009.

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Abstract. We study the horizontal structure of the atmospheric gravity waves (AGW) in the height ranges between 6 and 22 km observed using the MU radar at Shigaraki in Japan, during a 3 day period in January and a 4 day period in August 1988. The data were divided by double Fourier transformation into a data set of upward moving waves and a data set of downward moving waves for independent analysis. The phase and group velocity tracing technique was applied to measure the vertical group and phase velocity as well as the characteristic period of the gravity wave packet. Then the dispersion equa

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Nicholls, Stephen D., and George S. Young. "Dendritic Patterns in Tropical Cumulus: An Observational Analysis." Monthly Weather Review 135, no. 5 (2007): 1994–2005. http://dx.doi.org/10.1175/mwr3379.1.

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Abstract An observational analysis of the structure and synoptic setting of tropical dendritic cumulus formations was undertaken using 30 months of global data from the Moderate Resolution Imaging Spectroradiometer aboard the National Aeronautics and Space Administration Terra satellite, the Quick Scatterometer aboard the SeaWinds satellite, and the National Centers for Environmental Prediction global reanalysis. This analysis yielded 1216 cases of tropical dendritic cumulus formations of which 61 were randomly selected for quantitative study. From these sample cases, it was found that dendrit

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Agapitov, O., V. Krasnoselskikh, Yu Zaliznyak, V. Angelopoulos, O. Le Contel, and G. Rolland. "Observations and modeling of forward and reflected chorus waves captured by THEMIS." Annales Geophysicae 29, no. 3 (2011): 541–50. http://dx.doi.org/10.5194/angeo-29-541-2011.

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Abstract. Discrete ELF/VLF chorus emissions are the most intense electromagnetic plasma waves observed in the radiation belts of the Earth's magnetosphere. Chorus emissions, whistler-mode wave packets propagating roughly along magnetic field lines from a well-localized source in the vicinity of the magnetic equator to polar regions, can be reflected at low altitudes. After reflection, wave packets can return to the equatorial plane region. Understanding of whistler wave propagation and reflection is critical to a correct description of wave-particle interaction in the radiation belts. We focus

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Akhmedov, Yunus, Shuhrat Asadov, and Bobir Azimov. "Two-sided estimation of linear approximation error second - order hypersurfaces." Journal of Physics: Conference Series 2388, no. 1 (2022): 012124. http://dx.doi.org/10.1088/1742-6596/2388/1/012124.

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Abstract The following aspects of multidimensional space are considered in the article. The parametrizations of the hypersurface of the second order are considered, which allow visualizing them in the process of discretization. The development of the principle of vector modeling for displaying objects of multidimensional space on a two-dimensional plane made it possible to visually display the solution to the problem of linear approximation of a second-order hypersurface. The proposed method for discretizing a second-order hypersurface makes it possible to create a simple algorithm for its lin

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R, Rakesh, Mriganka Ghosh Majumder, K. Gopakumar, Loganathan Umanand, Carlo Cecati, and Dariusz Zielinski. "A Dense Multilevel 30-Sided Space Vector Generation Using a Single DC Link for an Induction Motor Drive." IEEE Transactions on Power Electronics 36, no. 10 (2021): 11681–90. http://dx.doi.org/10.1109/tpel.2021.3070078.

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Frolova, E. V., T. M. Ryabova, O. V. Rogach, and N. V. Medvedeva. "State Educational Order as a Factor in the Socio-Economic Development of Regions." Education and science journal 22, no. 1 (2020): 9–30. http://dx.doi.org/10.17853/1994-5639-2020-1-9-30.

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Introduction. Successful solution of the tasks of socio-economic development in the modern world is possible only in the case of effective functioning of the education system, which would provide training for a competitive personality, focused on continuous development and capable of “complying” with rapidly changing conditions of social reality. It is assumed that building an education development strategy, setting its goals and objectives should be based on the needs and problems of society, creating the basis for sustainable prosperity of the country and taking into account the needs of ind

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Launhardt, R., Th Henning, A. Quirrenbach, et al. "ISPY-NACO Imaging Survey for Planets around Young stars." Astronomy & Astrophysics 635 (March 2020): A162. http://dx.doi.org/10.1051/0004-6361/201937000.

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Context. The occurrence rate of long-period (a ≳ 50 au) giant planets around young stars is highly uncertain since it is not only governed by the protoplanetary disc structure and planet formation process, but also reflects both dynamical re-structuring processes after planet formation as well as possible capture of planets not formed in situ. Direct imaging is currently the only feasible method to detect such wide-orbit planets and constrain their occurrence rate. Aims. We aim to detect and characterise wide-orbit giant planets during and shortly after their formation phase within protoplanet

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Förster, M., S. E. Haaland, G. Paschmann, et al. "High-latitude plasma convection during Northward IMF as derived from in-situ magnetospheric Cluster EDI measurements." Annales Geophysicae 26, no. 9 (2008): 2685–700. http://dx.doi.org/10.5194/angeo-26-2685-2008.

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Abstract. In this study, we investigate statistical, systematic variations of the high-latitude convection cell structure during northward IMF. Using 1-min-averages of Cluster/EDI electron drift observations above the Northern and Southern polar cap areas for six and a half years (February 2001 till July 2007), and mapping the spatially distributed measurements to a common reference plane at ionospheric level in a magnetic latitude/MLT grid, we obtained regular drift patterns according to the various IMF conditions. We focus on the particular conditions during northward IMF, where lobe cells a

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Haaland, S., B. Sonnerup, and G. Paschmann. "More about arc-polarized structures in the solar wind." Annales Geophysicae 30, no. 5 (2012): 867–83. http://dx.doi.org/10.5194/angeo-30-867-2012.

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Abstract. We report results from a Cluster-based study of the properties of 28 arc-polarized magnetic structures (also called rotational discontinuities) in the solar wind. These Alfvénic events were selected from the database created and analyzed by Knetter (2005) by use of criteria chosen to eliminate ambiguous cases. His studies showed that standard, four-spacecraft timing analysis in most cases lacks sufficient accuracy to identify the small normal magnetic field components expected to accompany such structures, leaving unanswered the question of their existence. Our study aims to break th

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Line, C. M. B., M. T. Dove, K. S. Knight, and B. Winkler. "The low-temperature behaviour of analcime. 1: high-resolution neutron powder diffraction." Mineralogical Magazine 60, no. 400 (1996): 499–507. http://dx.doi.org/10.1180/minmag.1996.060.400.11.

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AbstractThe structure of a synthetic sample of analcime has been determined as a function of temperature between 30–300 K by high-resolution neutron powder diffraction. Although there are some reports of samples of analcime having non-cubic structures, the sample in our experiments remained cubic (space group la3d), and hence disordered, down to low temperatures. The absence of phase transitions involving ordering of the orientations of the water molecules, ordering of the sodium positions, or a displacive instability as in leucite and related materials, is discussed. We speculate that part of

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Gay, Jeffrey P., Lowell Miyagi, Samantha Couper, et al. "Deformation of NaCoF<sub>3</sub> perovskite and post-perovskite up to 30 GPa and 1013 K: implications for plastic deformation and transformation mechanism." European Journal of Mineralogy 33, no. 5 (2021): 591–603. http://dx.doi.org/10.5194/ejm-33-591-2021.

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Abstract. Texture, plastic deformation, and phase transformation mechanisms in perovskite and post-perovskite are of general interest for our understanding of the Earth's mantle. Here, the perovskite analogue NaCoF3 is deformed in a resistive-heated diamond anvil cell (DAC) up to 30 GPa and 1013 K. The in situ state of the sample, including crystal structure, stress, and texture, is monitored using X-ray diffraction. A phase transformation from a perovskite to a post-perovskite structure is observed between 20.1 and 26.1 GPa. Normalized stress drops by a factor of 3 during transformation as a

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Vermennikova, L. V., A. N. Lupishko, and D. V. Veselova. "SYNERGY OF LEAN TECHNOLOGIES AND DIGITALIZATION IN THE CONTEXT OF INCREASING THE EFFECTIVENESS OF PROCESSES IN AN EDUCATIONAL INSTITUTION." Bulletin of Udmurt University. Series Economics and Law 30, no. 3 (2020): 325–52. http://dx.doi.org/10.35634/2412-9593-2020-30-3-325-332.

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Digitalization of universities is an actual trend of our time, due to the direction of development of the Russian economy, focused on improving its efficiency. The tools for achieving this goal are largely lean and digital technologies.The existing regulatory framework of the Russian Federation in the field of effective development is analyzed. The object of analysis is federal and national projects and programs, the purpose of which is to increase labor productivity, ensure the quality and accessibility of services in various fields. The existence of links between federal projects aimed at im

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Khoroshavin, V. S., and V. S. Grudinin. "Optimal programmed movement with variable control times." Radio industry (Russia) 30, no. 3 (2020): 40–49. http://dx.doi.org/10.21778/2413-9599-2020-30-3-40-49.

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The problems of speed and accuracy are typical in the theory and practice of optimal control, and the requirement for the technology of minimum deviation from a given motion is often more important than speed. The search for controls that ensure the accuracy of reproducing the trajectory of motion for a given time of the transient process is considered. The Pontryagin maximum principle is used as the main method. It is supplemented for the study of special situations without analyzing auxiliary variables by the state commonness conditions (SCC) for nonlinear systems in extended coordinate spac

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Sheu, Albert Jeu-Liang. "A Cancellation Theorem for Modules Over the Group C*-Algebras of Certain Nilpotent Lie Groups." Canadian Journal of Mathematics 39, no. 2 (1987): 365–427. http://dx.doi.org/10.4153/cjm-1987-018-7.

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In recent years, there has been a rapid growth of the K-theory of C*-algebras. From a certain point of view, C*-algebras can be treated as “non-commutative topological spaces”, while finitely generated projective modules over them can be thought of as “non-commutative vector bundles”. The K-theory of C*-algebras [30] then generalizes the classical K-theory of topological spaces [1]. In particular, the K0-group of a unital C*-algebra A is the group “generated” by (or more precisely, the Grothendieck group of) the commutative semigroup of stable isomorphism classes of finitely generated projecti

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Ferreira, F. A., W. J. B. Corradi, F. F. S. Maia, M. S. Angelo, and J. F. C. Santos. "Discovery and astrophysical properties of Galactic open clusters in dense stellar fields using Gaia DR2." Monthly Notices of the Royal Astronomical Society 496, no. 2 (2020): 2021–38. http://dx.doi.org/10.1093/mnras/staa1684.

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ABSTRACT We report the discovery of 25 new open clusters resulting from a search in dense low Galactic latitude fields. We also provide, for the first time, structural and astrophysical parameters for the new findings and 34 other recently discovered open clusters using Gaia Data Release 2 (DR2) data. The candidates were confirmed by jointly inspecting the vector point diagrams and spatial distribution. The discoveries were validated by matching near known objects and comparing their mean astrometric parameters with the available literature. A decontamination algorithm was applied to the three

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Bondar, V. S., D. R. Abashev, and D. Ju Fomin. "Theories of plasticity under complex loading along spatial trajectories of deformations." PNRPU Mechanics Bulletin, no. 4 (December 15, 2021): 41–48. http://dx.doi.org/10.15593/perm.mech/2021.4.05.

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Variants of theories of plastic flow with combined hardening, which are widely used in practical calculations of structures, are considered. A comparative analysis of variants of the theory under complex loading along the spatial trajectories of deformations of constant and variable curvature and torsion is carried out. The trajectories of large curvature and from medium to large torsion are considered. The analysis of the research results is carried out in the vector space of A.A. Il’yushin. The spatial trajectories of deformations in the form of helical lines of constant and variable curvatu

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Campbell, R. J., M. Mathioudakis, M. Collados, et al. "Temporal evolution of small-scale internetwork magnetic fields in the solar photosphere." Astronomy & Astrophysics 647 (March 2021): A182. http://dx.doi.org/10.1051/0004-6361/202040028.

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Context. While the longitudinal field that dominates in photospheric network regions has been studied extensively, small-scale transverse fields have recently been found to be ubiquitous in the quiet internetwork photosphere and this merits further study. Furthermore, few observations have been able to capture how this field evolves. Aims. We aim to statistically characterize the magnetic vector in a quiet Sun internetwork region and observe the temporal evolution of specific small-scale magnetic features. Methods. We present two high spatio-temporal resolution observations that reveal the dyn

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Vlemmings, W. H. T., B. Lankhaar, P. Cazzoletti, et al. "Stringent limits on the magnetic field strength in the disc of TW Hya." Astronomy & Astrophysics 624 (April 2019): L7. http://dx.doi.org/10.1051/0004-6361/201935459.

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Despite their importance in the star formation process, measurements of magnetic field strength in proto-planetary discs remain rare. While linear polarisation of dust and molecular lines can give insight into the magnetic field structure, only observations of the circular polarisation produced by Zeeman splitting provide a direct measurement of magnetic field strenghts. One of the most promising probes of magnetic field strengths is the paramagnetic radical CN. Here we present the first Atacama Large Millimeter/submillimeter Array (ALMA) observations of the Zeeman splitting of CN in the disc

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Pisetski, V. B., and K. S. Ivanov. "Development of a fluid-dynamical model (DFM) of the Yamal Novoportovsky oiland gas-condensing deposit (based on DFM seismic data interpretation)." LITHOSPHERE (Russia) 19, no. 5 (2019): 752–66. http://dx.doi.org/10.24930/1681-9004-2019-19-5-752-766.

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Research subject. The idea of forecasting fluid-dynamical parameters is based on the views connecting the processes of sedimentation, tectonogenesis and fluid flows into an active fluid-dynamical model of the “sedimentary cover–basement” system. In such models, main fluid-dynamical parameters of oil and gas collectors, i.e. penetration and the vector of the fluid flow, are functionally connected with the components of the current state of the rock massif having a discrete (block) structure. These parameters can be calculated using DFM-interpretation technology developed by the authors in their

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