543 results on '"Krikun, A."'
Search Results
2. Bone marrow mesenchymal stem cell-derived exosomes shuttle microRNAs to endometrial stromal fibroblasts that promote tissue proliferation /regeneration/ and inhibit differentiation
- Author
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Bonavina, Giulia, Mamillapalli, Ramanaiah, Krikun, Graciela, Zhou, Yuping, Gawde, Nimisha, and Taylor, Hugh S.
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- 2024
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3. Momentum-dependent scaling exponents of nodal self-energies measured in strange metal cuprates and modelled using semi-holography
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S. Smit, E. Mauri, L. Bawden, F. Heringa, F. Gerritsen, E. van Heumen, Y. K. Huang, T. Kondo, T. Takeuchi, N. E. Hussey, M. Allan, T. K. Kim, C. Cacho, A. Krikun, K. Schalm, H.T.C. Stoof, and M. S. Golden
- Subjects
Science - Abstract
Abstract The anomalous strange metal phase found in high-T c cuprates does not follow the conventional condensed-matter principles enshrined in the Fermi liquid and presents a great challenge for theory. Highly precise experimental determination of the electronic self-energy can provide a test bed for theoretical models of strange metals, and angle-resolved photoemission can provide this as a function of frequency, momentum, temperature and doping. Here we show that constant energy cuts through the nodal spectral function in (Pb,Bi)2Sr2−x La x CuO6+δ have a non-Lorentzian lineshape, consistent with a self-energy that is k dependent. This provides a new test for aspiring theories. Here we show that the experimental data are captured remarkably well by a power law with a k-dependent scaling exponent smoothly evolving with doping, a description that emerges naturally from anti-de Sitter/conformal-field-theory based semi-holography. This puts a spotlight on holographic methods for the quantitative modelling of strongly interacting quantum materials like the cuprate strange metals.
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- 2024
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4. Bone marrow mesenchymal stem cell-derived exosomes shuttle microRNAs to endometrial stromal fibroblasts that promote tissue proliferation /regeneration/ and inhibit differentiation
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Giulia Bonavina, Ramanaiah Mamillapalli, Graciela Krikun, Yuping Zhou, Nimisha Gawde, and Hugh S. Taylor
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BMDSCs ,eSF ,Decidualization ,miRNAs ,Exosomes ,Medicine (General) ,R5-920 ,Biochemistry ,QD415-436 - Abstract
Abstract Background Human bone marrow-derived stem cells (hBMDSCs) are well characterized mediators of tissue repair and regeneration. An increasing body of evidence indicates that these cells exert their therapeutic effects largely through their paracrine actions rather than clonal expansion and differentiation. Here we studied the role of microRNAs (miRNAs) present in extracellular vesicles (EVs) from hBMDSCs in tissue regeneration and cell differentiation targeting endometrial stromal fibroblasts (eSF). Methods Extracellular vesicles (EVs) are isolated from hBMDSCs, characterized by transmission electron microscopy (TEM) and nanoparticle tracking analysis (NTA) techniques. Extracted total RNA from EVs was subjected to RNA seq analysis. Transfection and decidualization studies were carried out in endometrial stromal fibroblasts (eSF). Gene expression was analyzed by qRTPCR. Unpaired t-test with Welch’s correction was used for data analysis between two groups. Results We identified several microRNAs (miRNAs) that were highly expressed, including miR-21-5p, miR-100-5p, miR-143-3p and let7. MiR-21 is associated with several signaling pathways involved in tissue regeneration, quiescence, cellular senescence, and fibrosis. Both miR-100-5p and miR-143-3p promoted cell proliferation. MiR-100-5p specifically promoted regenerative processes by upregulating TGF-ß3, VEGFA, MMP7, and HGF. MiR-100-5p blocked differentiation or decidualization as evidenced by morphologic changes and downregulation of decidualization mediators including HOXA10, IGFBP1, PRL, PR-B, and PR. Conclusion EVs delivered to tissues by hBMDSCs contain specific miRNAs that prevent terminal differentiation and drive repair and regeneration. Delivery of microRNAs is a novel treatment paradigm with the potential to replace BMDSCs in cell-free regenerative therapies.
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- 2024
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5. Visean terrigenous sediments of the South Tatar Arch (Volga-Urals oil and gas bearing province) – multifacial filling of the karst surface of the Tournaisian isolated carbonate platform
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V. V. Silantiev, M. F. Validov, D. N. Miftakhutdinova, N. G. Nourgalieva, E. A. Korolev, B. G. Ganiev, A. A. Lutfullin, K. D. Shumatbaev, R. M. Khabipov, V. A. Sudakov, Yu. A. Akhmadullina, K. A. Golod, A. A. Leontev, R. R. Shamsiev, D. A. Nikonorova, S. S. Krikun, M. V. Noykin, and E. A. Abdullina
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sedimentation ,terrigenous carboniferous ,bobrikian regional stage ,incisions ,volga-urals ,oil-bearing ,reservoir rocks ,Geology ,QE1-996.5 - Abstract
The paper presents new thickness and sandiness maps of the Visean terrigenous strata (Radayevkian and Bobrikian regional stages, Lower Carboniferous) of the South Tatar Arch, constructed using the “Natural Neighbour” spatial interpolation method in ArcGIS Pro software based on the analysis of geophysical survey data for more than 30,000 boreholes.The interpretation of the maps in combination with the results of sedimentological, ichnotextural and petrophysical core studies, supplemented by the analysis of archival and published materials, provided an opportunity to update the approach to modelling the sedimentation of the terrigenous Lower Carboniferous of the South Tatar Arch. The proposed sedimentation models of terrigenous and coal-bearing sediments take into account the chronostratigraphic data, the karstification of isolated carbonate platforms, the sediment accumulation rates and the ichnotextural characteristics of the sediments. It is concluded that the accumulation and preservation of terrigenous and peat (coal-bearing) sediments differ in duration (0.1 million years vs. 1.5–2 million years) and are consequently associated with transgressive and regressive phases.The accumulation of terrigenous sediments includes: (a) transgressive eustatic episodes – short-term incursions of a marine basin onto the eroded surface of an isolated carbonate platform, during which silty and sandy, wellsorted bioturbated sediments were accumulated, often with a variety of ichnofossils of marine benthic organisms; (b) the regressive eustatic phase resulted in the predominant erosion of sediments on the arch; whereas sediments in the incisions were largely preserved.The accumulation of peat (coal-bearing) deposits includes (a) the regressive eustatic phase, during which the vast area of the eastern Volga-Urals region was covered with flourishing vegetation and stable swamp environments were forming in the incisions of the Tournaisian surface; (b) the transgressive phase – the peat was overlaid and buried by transgressive marine silt-sand sediments; then it was compacted and transformed into coal. The alternation of coal-bearing and transgressive intervals indicates the cyclicity of these processes.The proposed sedimentation models extend the concepts of previous studies and are consistent with the developed maps of thickness and sandiness of the Lower Carboniferous terrigenous sediments, explaining the complex, covering and mosaic distribution of sand bodies over the area, as well as the filling of incisions with sediments of different lithological types.
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- 2024
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6. Holographic timelike superconductor
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Alexander Krikun and Uriel Elinos
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Holography and Condensed Matter Physics (AdS/CMT) ,Discrete Symmetries ,Higher Spin Symmetry ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract We explore the state of matter characterized by the charged timelike vector order parameter. We employ holographic duality in order to construct such a state and study its thermoelectric transport, fermionic spectral function and the character of the Meissner effect. We uncover the unusual features of this “timelike superconductor”: the absence of the gap in the fermionic spectrum and co-existence of Drude peak and supercurrent in the AC transport, which are reminiscent to those of time-reversal-odd and gapless superconductors, correspondingly. We show that this state is dynamically stable and thermodynamically at least metastable. Along the way we develop the holographic model of the charged vector field, which acquires mass due to a variant of the Stueckelberg mechanism with the adjoint Higgs field.
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- 2024
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7. The Possibility of Elemental Analysis in the Tasks of Monitoring Marine Basins Using Ultrasonic Spark Spectroscopy
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Bulanov, A. V. and Krikun, V. A.
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- 2023
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8. Holographic timelike superconductor
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Krikun, Alexander and Elinos, Uriel
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- 2024
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9. Frequency of consumption of specialty food products by sports university students and violation of the principles of their introduction to the diets
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I. V. Kobelkova, M. M. Korosteleva, D. B. Nikityuk, and E. N. Krikun
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actual nutrition ,basketball ,students ,specialized foods ,dietary supplements ,Sports medicine ,RC1200-1245 - Abstract
Purpose: estimate actual diet of college basketball players, including frequency of consumption of specialty foods.Materials and methods: 25 male students sports university basketball were examined (average age 20.9 ± 1.8 years). Actual nutrition was studied by the frequency method using the computer program “Analysis of Human Nutritional Status”. Data on the frequency and quantity of consumed specialized food products for the nutrition of athletes (SFP) and biologically active food additives were studied using a questionnaire.Results: the daily energy value of the diet averaged 3205 ± 520 kcal/day, 135 ± 36 g of protein per day, 155 ± 25 g/day of fats and 317 ± 72 g/day of carbohydrates; unoptimal diet structure was revealed — fats predominate from the daily energy value, carbohydrate and protein intake was low. There is a discrepancy between daily food intake (low consumption of fruits, vegetables, bread, fish) and the Order of the Ministry of Sports of the Russian Federation dated October 30, 2015 No. 999 “On requirements approval for ensuring the sports reserves training for sports teams of the Russian Federation” requirements. Basic diet revealed a high average daily content of iron (19 ± 6 mg/day), vitamins A (1057 ± 729 µg ret. equiv) and C (153 ± 101 mg/day). Data on the frequency of taking SPPs and dietary supplements are provided. At the same time, content of some nutrients in them exceeded the upper permissible consumption levels.Conclusion: it is advisable to regularly increase the awareness of coaches and athletes about the rational nutrition principles through the introduction of educational programs into sports practice.
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- 2023
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10. Results of complex experimental studies at Vostok station in Antarctica
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Aleksei V. Bolshunov, Dmitrii A. Vasilev, Andrei N. Dmitriev, Sergei A. Ignatev, Vyacheslav G. Kadochnikov, Nikita S. Krikun, Danil V. Serbin, and Vyacheslav S. Shadrin
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antarctica ,vostok station ,ice cover ,drilling ,research works ,interdisciplinary connection ,Mining engineering. Metallurgy ,TN1-997 - Abstract
Scientific research in the area close to the Russian Antarctic station Vostok has been carried out since its founding on December 16, 1957. The relevance of work to study the region is steadily increasing, which is confirmed by the Strategy for the Development of Activities of the Russian Federation in the Antarctica until 2030. As part of the Strategy implementation, Saint Petersburg Mining University solves the comprehensive study issues of the Vostok station area, including the subglacial Lake Vostok, related to the development of modern technologies and technical means for drilling glaciers and underlying rocks, opening subglacial reservoirs, sampling water and bottom sediments, as well as carrying out comprehensive geological and geophysical research. For the successful implementation of the Strategy, at each stage of the work it is necessary to identify and develop interdisciplinary connections while complying with the requirements for minimizing the impact on the environment. During the season of the 68th Russian Antarctic Expedition, the staff of the Mining University, along with the current research works, began research of the dynamic interactions between the forces of the Earth, from the deepest depths to the surface glacier. Drilling and research programs have been completed. The drilling program was implemented jointly with colleagues from the Arctic and Antarctic Research Institute at the drilling complex of the 5G well. The research program included: shallow seismic studies, core drilling of snow-firn strata, study of the snow-firn strata petrostructural features, studies of cuttings collection filters effectiveness when drilling snow-firn strata and the process of ice destruction in a reciprocating rotational method, bench testing of an acoustic scanner. As a result of drilling in 5G well at the depth range of 3453.37-3534.43 m, an ice core more than 1 million years old was obtained.
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- 2023
11. On Application of Case-Based Reasoning to Personalise Learning
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Mamcenko, Jelena, Kurilovas, Eugenijus, and Krikun, Irina
- Abstract
The paper aims to present application of Educational Data Mining and particularly Case-Based Reasoning (CBR) for students profiling and further to design a personalised intelligent learning system. The main aim here is to develop a recommender system which should help the learners to create learning units (scenarios) that are the most suitable for them. First of all, systematic literature review on application of CBR and its possible implementation to personalise learning was performed in the paper. After that, methodology on CBR application to personalise learning is presented where learning styles play a dominate role as key factor in proposed personalised intelligent learning system model based on students profiling and personalised learning process model. The algorithm (the sequence of steps) to implement this model is also presented in the paper.
- Published
- 2019
12. Remote sensing techniques in the study of structural and geotectonic features of Iturup Island (the Kuril Islands)
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Irina V. Talovina, Nikita S. Krikun, Yurii Yu. Yurchenko, and Aleksey S. Ageev
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kuril island arc ,lineament analysis ,iturup ,tectonic fracturing ,hydrothermal magmatic systems ,seismotectonics ,Mining engineering. Metallurgy ,TN1-997 - Abstract
The article presents structural and geotectonic features of Iturup Island, the largest island in the Greater Kuril Ridge, a unique natural site, which can be considered as a geological reference. The structural and geotectonic analysis carried out on the basis of a comprehensive study of the new Earth remote sensing data, maps of anomalous geophysical geophysical fields, and other geological and geophysical materials using modern modelling methods made it possible for the first time to identify or clarify the location of previously discovered discontinuous faults, typify them and determine the kinematics, as well as to establish a more reliable spatial relationship of the identified structures with magmatism with the stages of the geological development of the region. The constructed diagram of the density distribution of the zones with increased tectonic fracturing shows a significant correlation between the distribution of minerals and weakened areas of the Earth's crust and can be used as an alternative method for predicting minerals in the study region, especially in remote and hard-to-reach areas. The presented approach can be extended to the other islands of the Greater Kuril Ridge, thereby bringing research geologists closer to obtaining the answers to questions about the features of the geotectonic structure and evolution of the island arc. The use of customized software products significantly speeds up the process of interpreting a large array of geological and geophysical data.
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- 2022
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13. ПОНЯТТЯ «МАНІПУЛЮВАННЯ»: СУТНІСТЬ ТА КОНТЕКСТИ
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Vitaly Krikun
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маніпулювання ,психологічний вплив ,«самоманіпулювання» ,мімікрія ,комунікація ,Philosophy (General) ,B1-5802 - Abstract
У статті досліджується маніпулювання як технологія комунікативного впливу, розглядаються основні підходи до розуміння поняття «маніпулювання». Пропонується розглядати поняття «маніпулювання» у двох аспектах: фізичному (об’єкт впливу - предмети) і психологічному (об’єкт впливу свідомість). Поняття «користь від застосування маніпулятивних прийомів» варто розглядати у контексті досягнення поставлених суб’єктом впливу цілей.
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- 2022
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14. Nodal-antinodal dichotomy from anisotropic quantum critical continua in holographic models
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Ronnie Rodgers, Jewel Kumar Ghosh, Alexander Krikun
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Physics ,QC1-999 - Abstract
We demonstrate that the absence of stable quasiparticle excitations on parts of the Fermi surface, similar to the "nodal-antinodal dichotomy" in underdoped cuprate superconductors, can be reproduced in models of strongly correlated electrons defined via a holographic dual. We show analytically that the anisotropy of the quantum critical continuum, which is a feature of these models, may lead to washing out the quasiparticle peak in one direction while leaving it intact in the perpendicular one. The effect relies on the qualitatively different scaling of the self-energy in different directions. Using the explicit example of the anisotropic Q-lattice model, we demonstrate how this effect emerges due to specific features of the near horizon geometry of the black hole in the dual description.
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- 2023
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15. Phase relaxation and pattern formation in holographic gapless charge density waves
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Tomas Andrade, Matteo Baggioli, and Alexander Krikun
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Holography and condensed matter physics (AdS/CMT) ,Spontaneous Symmetry Breaking ,Space-Time Symmetries ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract We study the dynamics of spontaneous translation symmetry breaking in holographic models in presence of weak explicit sources. We show that, unlike conventional gapped quantum charge density wave systems, this dynamics is well characterized by the effective time dependent Ginzburg-Landau equation, both above and below the critical temperature, which leads to a “gapless” algebraic pattern of metal-insulator phase transition. In this framework we elucidate the nature of the damped Goldstone mode (the phason), which has earlier been identified in the effective hydrodynamic theory of pinned charge density wave and observed in holographic homogeneous lattice models. We follow the motion of the quasinormal modes across the dynamical phase transition in models with either periodic inhomogeneous or helical homogeneous spatial structures, showing that the phase relaxation rate is continuous at the critical temperature. Moreover, we find that the qualitative low-energy dynamics of the broken phase is universal, insensitive to the precise pattern of translation symmetry breaking, and therefore applies to homogeneous models as well.
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- 2021
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16. Widely distributed breeding populations of Canada warbler (Cardellina canadensis) converge on migration through Central America
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A. Roberto-Charron, J. Kennedy, L. Reitsma, J. A. Tremblay, R. Krikun, K. A. Hobson, J. Ibarzabal, and K. C. Fraser
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Migration ,Geolocators ,Songbird ,Nearctic-Neotropical migratory birds ,Canada warbler ,Cardellina canadensis ,Zoology ,QL1-991 - Abstract
Abstract Background To effectively conserve migratory species, the entire range encompassed by their annual life cycle needs to be considered. Most research on Nearctic-Neotropical migratory birds has focused on the breeding grounds resulting in a general lack of knowledge regarding the wintering and migratory periods. The Canada Warbler (Cardellina canadensis) has declined by 71% from 1970 to 2012, at a rate of 2.9% per year, and is listed as Threatened in Canada. As with most Nearctic-Neotropical migrants, conservation efforts outside the breeding range are limited by a poor understanding of migration routes and the connectivity between specific breeding and wintering populations. Results To determine migratory routes of multiple breeding populations of Canada Warblers, we directly-tracked individuals using light-level geolocators deployed at four sites across the breeding range, spanning approximately 43 degrees in longitude (Alberta, Manitoba and Québec, Canada, and New Hampshire, USA). Twenty-five geolocators with usable data were recovered from three sites and were analyzed using FlightR to determine fall migration routes (n = 18) and individual wintering sites (n = 25). Individuals from all breeding populations took a western fall migration route at the Gulf of Mexico; with 77.8% of birds funnelling into a narrow geographic space along the western side of the Gulf of Mexico (97°W-99°W). We found no evidence for population-specific, parallel migration routes. Most individuals (72%) overwintered in Colombia. The remaining individuals overwintered in Venezuela. Conclusions Our results demonstrate convergence of migratory routes around a migration barrier for individuals originating from widely distributed breeding areas. Further, we suggest the potential importance of habitat around the Gulf of Mexico during migration and Andean forest in Colombia as overwintering habitat for this threatened species. Future research should be directed at understanding how these areas are used by Canada Warblers.
- Published
- 2020
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17. Relaxation regimes of the holographic electrons at charge neutrality after a local quench of chemical potential
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Alexander Krikun
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Holography and condensed matter physics (AdS/CMT) ,Space-Time Symmetries ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract In this work we study the relaxation of the system of strongly correlated electrons, at charge neutrality, when the chemical potential undergoes a local change. This setup is a model for the X-ray absorbtion edge study in the half-filled graphene. We use holographic duality to describe the system as a classical Schwarzschild black hole in curved 4-dimensional AdS spacetime. Assuming the amplitude of the quench is small, we neglect the backreaction on the geometry. We numerically study the two relaxation regimes: the adiabatic relaxation when the quench is slow and the relaxation governed by the quasinormal modes of the system, when the quench is fast. We confirm the expectation that the scale of separation between the slow and fast regimes is set by the characteristic frequency of the quasinormal modes.
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- 2020
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18. Anisotropic destruction of the Fermi surface in inhomogeneous holographic lattices
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Askar Iliasov, Andrey A. Bagrov, Mikhail I. Katsnelson, and Alexander Krikun
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Holography and condensed matter physics (AdS/CMT) ,AdS-CFT Correspondence ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract We analyze fermionic response of strongly correlated holographic matter in presence of inhomogeneous periodically modulated potential mimicking the crystal lattice. The modulation is sourced by a scalar operator that explicitly breaks the translational symmetry in one direction. We compute the fermion spectral function and show that it either exhibits a well defined Fermi surface with umklapp gaps opening on the Brillouin zone boundary at small lattice wave vector, or, when the wave vector is large, the Fermi surface is anisotropically deformed and the quasiparticles get significantly broadened in the direction of translation symmetry breaking. Making use of the ability of our model to smoothly extrapolate to the homogeneous Q-lattice like setup, we show that this novel effect is not due to the periodic modulation of the potential and Umklapp physics, but rather due to the anisotropic features of the holographic horizon. That means it encodes novel physics of strongly correlated critical systems which may be relevant for phenomenology of exotic states of electron matter.
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- 2020
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19. Isolated zeros destroy Fermi surface in holographic models with a lattice
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Floris Balm, Alexander Krikun, Aurelio Romero-Bermúdez, Koenraad Schalm, and Jan Zaanen
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Holography and condensed matter physics (AdS/CMT) ,Space-Time Symmetries ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract We study the fermionic spectral density in a strongly correlated quantum system described by a gravity dual. In the presence of periodically modulated chemical potential, which models the effect of the ionic lattice, we explore the shapes of the corresponding Fermi surfaces, defined by the location of peaks in the spectral density at the Fermi level. We find that at strong lattice potentials sectors of the Fermi surface are unexpectedly destroyed and the Fermi surface becomes an arc-like disconnected manifold. We explain this phenomenon in terms of a collision of the Fermi surface pole with zeros of the fermionic Green’s function, which are explicitly computable in the holographic dual.
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- 2020
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20. Modernisation of filter design with bulk dispersed media
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Rudnev Sergey, Krikun Aleksandra, and Feoktistova Veronika
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modernisation ,design ,filter ,dispersed media ,mechanical activation ,aqueous solutions ,seawater ,Environmental sciences ,GE1-350 - Abstract
The object of research in this article is the design of the filter with bulk dispersed media; this type of device has a wide application within the framework of water treatment for technological needs of food enterprises. On the basis of the data of the previously obtained complex of theoretical and experimental studies of the process of bulk filtration of mechanically activated aqueous solutions, the main purpose of the work is to find effective options for modernisation of the filter design with bulk dispersed media, allowing one to improve the filtration process, namely to increase productivity and improve the quality of filtrate. The research methods included both theoretical (methods of analysis, comparison, etc.) and experimental measures aimed at studying vibromechanical activation of the initial solution in the process of filtration, studying the physical and chemical properties of the activated solution, and determining the rational modes of mechanical action. The results obtained in the course of the research are determined by the basis of the modernisation of the device, the changes made in the design had a positive effect on its operation, and the cycle time changed by 20-22 %. The achievements of the device modernisation are represented by: built-in vibromechanoactivators; washing and regeneration without the use of reagents; measurement by sensors of indicators in the device tanks before and after the filtering process; improved wear resistance and durability of the casing coating inside and outside. On this basis, further plans are focused on the realisation of the design ideas into an experimental industrial unit and subsequent research in laboratory and industrial conditions.
- Published
- 2023
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21. Analysis of the effectiveness of callusogenesis on media developed on the basis of the RZ medium
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Goncharova Yulia K., Vereshchagina Svetlana A., Simonova Viktoria V., Garkusha Sergey V., and Krikun Karina S.
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Environmental sciences ,GE1-350 - Abstract
There is still no consensus on the composition of nutrient media for various genotypes, and the improvement of their composition is still an urgent problem, the solution of which can significantly speed up and facilitate the breeding process, both in traditional and heterotic breeding. In this regard, the main goal of the study was to compile new variants of nutrient media and establish the relationship between changes in the components of the medium and the efficiency of callus formation. Previously, we showed the advantage of the RZ nutrient medium (Raina, Zapata. 1997) over the N nutrient medium (Nitsch, Nitsch 1969) for domestic varieties and hybrids, but to further increase the efficiency of callusogenesis, 5 variants based on the RZ nutrient medium were developed. The nutrient medium R1 was characterized by a reduced content of CaCl2·2H2O by almost three times, however, the results obtained on it were significantly better than on the initial nutrient medium RZ.
- Published
- 2023
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22. Charge density response and fake plasmons in holographic models with strong translation symmetry breaking
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Tomas Andrade, Alexander Krikun, and Aurelio Romero-Bermúdez
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Holography and condensed matter physics (AdS/CMT) ,AdS-CFT Correspondence ,Gauge-gravity correspondence ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract We study the charge density response in holographic models with explicit trans- lation symmetry breaking which is relevant in IR. In particular, we focus on Q-lattices and the Bianchy VII helix. We show that the hydrodynamic sound mode is removed from the spectrum due to the strong momentum relaxation and therefore, the usual treatment of the plasmon as Coulomb-dressed zero sound does not apply. Furthermore, the dominant coherent modes in the longitudinal channel, which control the neutral density-density correlator, are the diffusive modes. We show these modes are strongly suppressed when the boundary Coulomb interaction is turned on. This renders the low frequency charge density response spectrum completely incoherent and featureless. At intermediate frequencies, we observe a broad feature — the fake plasmon — in the dressed correlator, which could be confused with an overdamped plasmon. However, its gap is set by the scale of translation symmetry breaking instead of the plasma frequency. This broad feature originates from the non-hydrodynamic sector of the holographic spectrum, and therefore, its behaviour, typical of strongly correlated quantum critical systems with holographic duals, deviates from the standard Fermi-liquid paradigm.
- Published
- 2019
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23. On Application of Case-Based Reasoning to Personalise Learning
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Jelena MAMCENKO, Eugenijus KURILOVAS, and Irina KRIKUN
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case-based reasoning ,learning styles ,educational data mining ,forecasting ,personalised learning system ,Special aspects of education ,LC8-6691 - Abstract
The paper aims to present application of Educational Data Mining and particularly Case-Based Reasoning (CBR) for students profiling and further to design a personalised intelligent learning system. The main aim here is to develop a recommender system which should help the learners to create learning units (scenarios) that are the most suitable for them. First of all, systematic literature review on application of CBR and its possible implementation to personalise learning was performed in the paper. After that, methodology on CBR application to personalise learning is presented where learning styles play a dominate role as key factor in proposed personalised intelligent learning system model based on students profiling and personalised learning process model. The algorithm (the sequence of steps) to implement this model is also presented in the paper.
- Published
- 2019
- Full Text
- View/download PDF
24. Coherent vs incoherent transport in holographic strange insulators
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Tomas Andrade and Alexander Krikun
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Holography and condensed matter physics (AdS/CMT) ,Space-Time Symmetries ,Spontaneous Symmetry Breaking ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract Holographic strange metals are known to have a power law resistivity rising with temperature, which is reminiscent of the strange metal phases in condensed matter systems. In some holographic models, however, the exponent of the power law in the resistivity can be negative. In this case one encounters phases with diverging resistivity at zero temperature: holographic strange insulators. These states arise as a result of translational symmetry breaking in the system, which can either be strong explicit and relevant in the IR, or spontaneous, but pinned by a small explicit source. In some regards, one can associate these two classes to the normal band insulators due to the strong ionic potential, and Mott insulator due to the commensurate lock in of the charge density wave. We study different features of these classes on the explicit example of a holographic helical model with homogeneous Bianchy VII type translational symmetry breaking, and uncover the main mechanisms underlying transport in these two cases. We find that while transport in the explicit relevant case is governed by the incoherent conductivity, in the pinned spontaneous case the leading contribution comes from the coherent part.
- Published
- 2019
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25. Phase and structural transformations in VVER-440 RPV base metal after long-term operation and recovery annealing
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Kuleshova, E.A., Gurovich, B.A., Maltsev, D.A., Frolov, A.S., Bukina, Z.V., Fedotova, S.V., Saltykov, M.A., Krikun, E.V., Erak, D. Yu, Zhurko, D.A., Safonov, D.V., and Zhuchkov, G.M.
- Published
- 2018
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26. Google’s Multilingual Neural Machine Translation System: Enabling Zero-Shot Translation
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Melvin Johnson, Mike Schuster, Quoc V. Le, Maxim Krikun, Yonghui Wu, Zhifeng Chen, Nikhil Thorat, Fernanda Viégas, Martin Wattenberg, Greg Corrado, Macduff Hughes, and Jeffrey Dean
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Computational linguistics. Natural language processing ,P98-98.5 - Published
- 2021
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27. Icon immunoconjugate treatment results in regression of red lesions in a non-human primate (Papio anubis) model of endometriosis
- Author
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Hufnagel, Demetra, Goetz, Teddy G., Hu, Zhiwei, Nyachieo, Atunga, D’Hooghe, Thomas, Fazleabas, Asgerally, Duleba, Antoni, Krikun, Graciela, Taylor, Hugh S., and Lockwood, Charles J.
- Published
- 2018
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28. Phase relaxation and pattern formation in holographic gapless charge density waves
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Andrade, Tomas, Baggioli, Matteo, and Krikun, Alexander
- Published
- 2021
- Full Text
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29. Holographic discommensurations
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Alexander Krikun
- Subjects
Holography and condensed matter physics (AdS/CMT) ,Space-Time Symmetries ,Solitons Monopoles and Instantons ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract When the system with internal tendency to a spontaneous formation of a spatially periodic state is brought in contact with the external explicit periodic potential, the interesting phenomenon of commensurate lock in can be observed. In case when the explicit potential is strong enough and its period is close to the period of the spontaneous structure, the latter is forced to assume the periodicity of the former and the commensurate state becomes a thermodynamically preferred one. If instead the two periods are significantly different, the incommensurate state is formed. It is characterized by a finite density of solitonic objects — discommensurations — on top of the commensurate state. In this note I study the properties of discommensurations in holographic model with inhomogeneous translational symmetry breaking and explain how one can understand the commensurate/incommensurate phase transition as a proliferation of these solitons. Some useful numerical techniques are discussed in the appendix.
- Published
- 2018
- Full Text
- View/download PDF
30. Drivers of demographic decline across the annual cycle of a threatened migratory bird
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Scott Wilson, James F. Saracco, Richard Krikun, D. T. Tyler Flockhart, Christine M. Godwin, and Kenneth R. Foster
- Subjects
Medicine ,Science - Abstract
Abstract Migratory species are rapidly declining but we rarely know which periods of the annual cycle are limiting for most species. This knowledge is needed to effectively allocate conservation resources to the periods of the annual cycle that best promote species recovery. We examined demographic trends and response to human footprint for Canada warblers (Cardellina canadensis), a threatened Neotropical migrant, using range-wide data (1993–2016) from the Monitoring Avian Productivity and Survivorship (MAPS) program on the breeding grounds. Declines in abundance were steepest in the eastern breeding region, followed by the western region. Breeding productivity did not decline in any region. In contrast, we observed declining recruitment in all regions, low apparent survival in the east and west, and a decline in apparent survival in the east. Abundance declined with increasing disturbance around MAPS stations. Between 1993 and 2009, the human footprint index on the breeding range increased by 0.11% in contrast to a 14% increase on the wintering range. Landscape-scale disturbance on the breeding grounds may influence abundance in some regions; however, the observed trends in demography and footprint suggests limitation during the non-breeding period as the likely driver of overall declines, particularly for eastern populations.
- Published
- 2018
- Full Text
- View/download PDF
31. Pinning of longitudinal phonons in holographic spontaneous helices
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Tomas Andrade, Matteo Baggioli, Alexander Krikun, and Napat Poovuttikul
- Subjects
Holography and condensed matter physics (AdS/CMT) ,AdS-CFT Correspondence ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract We consider the spontaneous breaking of translational symmetry and identify the associated Goldstone mode — a longitudinal phonon — in a holographic model with Bianchi VII helical symmetry. For the first time in holography, we observe the pinning of this mode after introducing a source for explicit breaking compatible with the helical symmetry of our setup. We study the dispersion relation of the resulting pseudo-Goldstone mode, uncovering how its speed and mass gap depend on the amplitude of the source and temperature. In addition, we extract the optical conductivity as a function of frequency, which reveals a metal-insulator transition as a consequence of the pinning.
- Published
- 2018
- Full Text
- View/download PDF
32. Mechanisms of radiation embrittlement of VVER-1000 RPV steel at irradiation temperatures of (50–400)°C
- Author
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Kuleshova, E.A., Gurovich, B.A., Bukina, Z.V., Frolov, A.S., Maltsev, D.A., Krikun, E.V., Zhurko, D.A., and Zhuchkov, G.M.
- Published
- 2017
- Full Text
- View/download PDF
33. Widely distributed breeding populations of Canada warbler (Cardellina canadensis) converge on migration through Central America
- Author
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Roberto-Charron, A., Kennedy, J., Reitsma, L., Tremblay, J. A., Krikun, R., Hobson, K. A., Ibarzabal, J., and Fraser, K. C.
- Published
- 2020
- Full Text
- View/download PDF
34. Relaxation regimes of the holographic electrons at charge neutrality after a local quench of chemical potential
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Krikun, Alexander
- Published
- 2020
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35. Anisotropic destruction of the Fermi surface in inhomogeneous holographic lattices
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Iliasov, Askar, Bagrov, Andrey A., Katsnelson, Mikhail I., and Krikun, Alexander
- Published
- 2020
- Full Text
- View/download PDF
36. Doping the holographic Mott insulator
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Andrade, Tomas, Krikun, Alexander, Schalm, Koenraad, and Zaanen, Jan
- Published
- 2018
- Full Text
- View/download PDF
37. Commensurate lock-in in holographic non-homogeneous lattices
- Author
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Tomas Andrade and Alexander Krikun
- Subjects
Holography and condensed matter physics (AdS/CMT) ,Space-Time Symmetries ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract We consider the spontaneous formation of striped structures in a holographic model which possesses explicit translational symmetry breaking, dual to an ionic lattice with spatially modulated chemical potential. We focus on the perturbative study of the marginal modes which drive the transition to a phase exhibiting spontaneous stripes. We study the wave-vectors of the instabilities with largest critical temperature in a wide range of backgrounds characterized by the period and the amplitude of the chemical potential modulation. We report the first holographic observation of the commensurate lock-in between the spontaneous stripes and the underlying ionic lattice, which takes place when the amplitude of the lattice is large enough. We also observe an incommensurate regime in which the amplitude of the lattice is finite, but the preferred stripe wave-vector is different from that of the lattice.
- Published
- 2017
- Full Text
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38. PaLM 2 Technical Report
- Author
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Anil, Rohan, Dai, Andrew M., Firat, Orhan, Johnson, Melvin, Lepikhin, Dmitry, Passos, Alexandre, Shakeri, Siamak, Taropa, Emanuel, Bailey, Paige, Chen, Zhifeng, Chu, Eric, Clark, Jonathan H., Shafey, Laurent El, Huang, Yanping, Meier-Hellstern, Kathy, Mishra, Gaurav, Moreira, Erica, Omernick, Mark, Robinson, Kevin, Ruder, Sebastian, Tay, Yi, Xiao, Kefan, Xu, Yuanzhong, Zhang, Yujing, Abrego, Gustavo Hernandez, Ahn, Junwhan, Austin, Jacob, Barham, Paul, Botha, Jan, Bradbury, James, Brahma, Siddhartha, Brooks, Kevin, Catasta, Michele, Cheng, Yong, Cherry, Colin, Choquette-Choo, Christopher A., Chowdhery, Aakanksha, Crepy, Clément, Dave, Shachi, Dehghani, Mostafa, Dev, Sunipa, Devlin, Jacob, Díaz, Mark, Du, Nan, Dyer, Ethan, Feinberg, Vlad, Feng, Fangxiaoyu, Fienber, Vlad, Freitag, Markus, Garcia, Xavier, Gehrmann, Sebastian, Gonzalez, Lucas, Gur-Ari, Guy, Hand, Steven, Hashemi, Hadi, Hou, Le, Howland, Joshua, Hu, Andrea, Hui, Jeffrey, Hurwitz, Jeremy, Isard, Michael, Ittycheriah, Abe, Jagielski, Matthew, Jia, Wenhao, Kenealy, Kathleen, Krikun, Maxim, Kudugunta, Sneha, Lan, Chang, Lee, Katherine, Lee, Benjamin, Li, Eric, Li, Music, Li, Wei, Li, YaGuang, Li, Jian, Lim, Hyeontaek, Lin, Hanzhao, Liu, Zhongtao, Liu, Frederick, Maggioni, Marcello, Mahendru, Aroma, Maynez, Joshua, Misra, Vedant, Moussalem, Maysam, Nado, Zachary, Nham, John, Ni, Eric, Nystrom, Andrew, Parrish, Alicia, Pellat, Marie, Polacek, Martin, Polozov, Alex, Pope, Reiner, Qiao, Siyuan, Reif, Emily, Richter, Bryan, Riley, Parker, Ros, Alex Castro, Roy, Aurko, Saeta, Brennan, Samuel, Rajkumar, Shelby, Renee, Slone, Ambrose, Smilkov, Daniel, So, David R., Sohn, Daniel, Tokumine, Simon, Valter, Dasha, Vasudevan, Vijay, Vodrahalli, Kiran, Wang, Xuezhi, Wang, Pidong, Wang, Zirui, Wang, Tao, Wieting, John, Wu, Yuhuai, Xu, Kelvin, Xu, Yunhan, Xue, Linting, Yin, Pengcheng, Yu, Jiahui, Zhang, Qiao, Zheng, Steven, Zheng, Ce, Zhou, Weikang, Zhou, Denny, Petrov, Slav, and Wu, Yonghui
- Subjects
FOS: Computer and information sciences ,Artificial Intelligence (cs.AI) ,Computer Science - Computation and Language ,Computer Science - Artificial Intelligence ,Computation and Language (cs.CL) - Abstract
We introduce PaLM 2, a new state-of-the-art language model that has better multilingual and reasoning capabilities and is more compute-efficient than its predecessor PaLM. PaLM 2 is a Transformer-based model trained using a mixture of objectives. Through extensive evaluations on English and multilingual language, and reasoning tasks, we demonstrate that PaLM 2 has significantly improved quality on downstream tasks across different model sizes, while simultaneously exhibiting faster and more efficient inference compared to PaLM. This improved efficiency enables broader deployment while also allowing the model to respond faster, for a more natural pace of interaction. PaLM 2 demonstrates robust reasoning capabilities exemplified by large improvements over PaLM on BIG-Bench and other reasoning tasks. PaLM 2 exhibits stable performance on a suite of responsible AI evaluations, and enables inference-time control over toxicity without additional overhead or impact on other capabilities. Overall, PaLM 2 achieves state-of-the-art performance across a diverse set of tasks and capabilities. When discussing the PaLM 2 family, it is important to distinguish between pre-trained models (of various sizes), fine-tuned variants of these models, and the user-facing products that use these models. In particular, user-facing products typically include additional pre- and post-processing steps. Additionally, the underlying models may evolve over time. Therefore, one should not expect the performance of user-facing products to exactly match the results reported in this report.
- Published
- 2023
39. The role of innovations in the development of agriculture in Russia
- Author
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Kharitonov Evgeniy, Krikun Karina, and Nesmyslenov Alexander
- Subjects
Environmental sciences ,GE1-350 - Abstract
This article is intended to substantiate the role of innovations in the development of agriculture in Russia. The authors of the article focused on identifying the importance of innovative techniques and technologies in the modern development of the agricultural industry. The current directions of innovative developments in the agricultural sector in Russia have been identified and investigated. The conditions for achieving effective implementation of digital land use projects are presented; “Smart field”; “Smart garden; Smart farm. The experience and level of development of innovative techniques and technologies in foreign countries are considered. An up-to-date list of both Russian and foreign manufacturers of innovative developments, the buyers of which are domestic agricultural organizations, is presented. The factors that hinder the active implementation of innovations in the activities of agricultural entities in Russia have been identified. A diagram of the relationship between the components of the process of creating and applying innovative technologies has been developed. Also the author’s schematic position of the role and place of innovations in the process of creating and applying innovative technologies is presented. As a result of the research, there were given recommendations for eliminating the identified problems in the field of introducing innovative techniques and technologies in agricultural production.
- Published
- 2021
- Full Text
- View/download PDF
40. Method of increasing yield indicators of rice varieties in process of seed production
- Author
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Ochkas N. A., Goncharova Yu. K., Braginа O. A., and Krikun K.S.
- Subjects
Environmental sciences ,GE1-350 - Abstract
The paper describes a method for creating new and increasing the yield of existing varieties based on analysis variability elements of rice varieties yield structure under influence of environmental conditions. Seeding rates are used as a source of variability. Following trait are analyzed: seeds field germination, survival plants before harvesting, total tillering of plants, realization of total tillering, graininess of panicle, fertility of spikelets, weight of 1000 grains. Based on analysis, through onnections conjugated elements, the optimal values of elements structure of yield are determined, at which it takes the maximum value. Based on a set of optimal values, theoretical model of studied rice variety is being developed. Then, according to panicles selected in variety, single-row plots are sown for further propagation, rows with parameters of the yield structure elements set same with model of variety are selected, which makes it possible to increase the yield of Mavr rice variety by 39.18 centners / ha or 45.61%.
- Published
- 2021
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- View/download PDF
41. Coherent vs incoherent transport in holographic strange insulators
- Author
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Andrade, Tomas and Krikun, Alexander
- Published
- 2019
- Full Text
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42. Universal Autonomous Module for Sea Water Bio-Optical Parameters Measurement.
- Author
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Krikun, V., Salyuk, P., and Bulanov, A.
- Abstract
To solve many fundamental and applied problems, there are not enough regular measurements made in the water column or under the ice.This article describes the results of the development of a budget multipurpose stand-alone optical module for network and/or complex sub-satellite measurements of seawater fluorescence. The relevance of the study is determined by the need in autonomous networks of global underwater observation of the sea water optical parameters. The scientific novelty of the research consists in the development of universal optical modules that can be combined, both in a complex and unified complex for hydro-optical studies, and separately organized into a distributed network of hydro-optical measurements. This solution will allow to universalize the creation of complexes of underwater hydro-optical measurements, as well as to modernize existing underwater vehicles and instruments that do not have optical sensors. This will make possible to investigate the functioning processes of phytoplankton communities and the reproduction of dissolved organic matters in extended locations, to study the influence of hydrophysical processes on the distribution of bio-optical parameters of sea water, and to conduct sub-satellite measurements and eco-monitoring. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
43. Effect of Ni content on thermal and radiation resistance of VVER RPV steel
- Author
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Shtrombakh, Ya.I., Gurovich, B.A., Kuleshova, E.A., Frolov, A.S., Fedotova, S.V., Zhurko, D.A., and Krikun, E.V.
- Published
- 2015
- Full Text
- View/download PDF
44. The unreasonable effectiveness of few-shot learning for machine translation
- Author
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Garcia, Xavier, Bansal, Yamini, Cherry, Colin, Foster, George, Krikun, Maxim, Feng, Fangxiaoyu, Johnson, Melvin, and Firat, Orhan
- Subjects
FOS: Computer and information sciences ,Computer Science - Computation and Language ,Computation and Language (cs.CL) - Abstract
We demonstrate the potential of few-shot translation systems, trained with unpaired language data, for both high and low-resource language pairs. We show that with only 5 examples of high-quality translation data shown at inference, a transformer decoder-only model trained solely with self-supervised learning, is able to match specialized supervised state-of-the-art models as well as more general commercial translation systems. In particular, we outperform the best performing system on the WMT'21 English - Chinese news translation task by only using five examples of English - Chinese parallel data at inference. Moreover, our approach in building these models does not necessitate joint multilingual training or back-translation, is conceptually simple and shows the potential to extend to the multilingual setting. Furthermore, the resulting models are two orders of magnitude smaller than state-of-the-art language models. We then analyze the factors which impact the performance of few-shot translation systems, and highlight that the quality of the few-shot demonstrations heavily determines the quality of the translations generated by our models. Finally, we show that the few-shot paradigm also provides a way to control certain attributes of the translation -- we show that we are able to control for regional varieties and formality using only a five examples at inference, paving the way towards controllable machine translation systems.
- Published
- 2023
45. ON THE EFFECT OF MIXING ON THE SURFACE ENERGY OF AQUEOUS SOLUTIONS
- Author
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Rudnev, S.D., Krikun, A.I., Ivanov, V.V., Feoktistova, V.V., and Sumenkov, M.V.
- Subjects
aqueous solutions ,mechanical activation ,surface tension ,vibration mechanical activation - Abstract
A series of experimental studies has been conducted to investigate the surface tension of aqueous solutions during mechanical and vibration mechanical activation, as well as in a resting state after the mechanical treatment. The time ranges in which the minimum surface energy was recorded were determined.
- Published
- 2023
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46. Commensurate lock-in in holographic non-homogeneous lattices
- Author
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Andrade, Tomas and Krikun, Alexander
- Published
- 2017
- Full Text
- View/download PDF
47. Behavioral responses to spring snow conditions contribute to long-term shift in migration phenology in American robins
- Author
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Ruth Y Oliver, Peter J Mahoney, Eliezer Gurarie, Nicole Krikun, Brian C Weeks, Mark Hebblewhite, Glen Liston, and Natalie Boelman
- Subjects
Turdus migratorius ,migration ,climate change ,Arctic-boreal ,Environmental technology. Sanitary engineering ,TD1-1066 ,Environmental sciences ,GE1-350 ,Science ,Physics ,QC1-999 - Abstract
Migratory birds have the capacity to shift their migration phenology in response to climatic change. Yet the mechanistic underpinning of changes in migratory timing remain poorly understood. We employed newly developed global positioning system (GPS) tracking devices and long-term dataset of migration passage timing to investigate how behavioral responses to environmental conditions relate to phenological shifts in American robins ( Turdus migratorius ) during spring migration to Arctic-boreal breeding grounds. We found that over the past quarter-century (1994–2018), robins have migrated ca. 5 d/decade earlier. Based on GPS data collected for 55 robins over three springs (2016–2018), we found the arrival timing and likelihood of stopovers, and timing of arrival to breeding grounds, were strongly influenced by dynamics in snow conditions along migratory paths. These findings suggest plasticity in migratory behavior may be an important mechanism for how long-distance migrants adjust their breeding phenology to keep pace with advancement of spring on breeding grounds.
- Published
- 2020
- Full Text
- View/download PDF
48. Teaching the 'People's Music' at the 'People's College': A Historical Study of American Popular Music in the American Junior
- Author
-
Krikun, Andrew H.
- Abstract
Although the teaching and learning of popular music in formal educational institutions remains a controversial issue in the United States and abroad, historical research studies on the development of popular music education have been scarce. This study examines the introduction of popular music education into the American public junior college music curriculum beginning in the Great Depression and concluding with the rise of rock and roll in 1955, a popular music style that demanded a different pedagogical paradigm. Historical case studies were conducted on three public junior colleges in the Los Angeles metropolitan area (Long Beach Junior College, Los Angeles Junior College, and Pasadena Junior College) that were instrumental in introducing American popular music into the junior college curriculum during the 1930s, at a time when the traditional college music curriculum was devoted exclusively to the Western European art music canon. In each case study, the sociocultural context of the junior college's home city, the mission of the junior college, the composition of the music faculty and the music curriculum, and the role of popular music in the curriculum were investigated. Factors that contributed to curricular innovation are summarized, including the cultural milieu of New Deal-era Los Angeles, the national expansion of the public junior college movement, and the focus on vocational education in California between World War I and World War II. The rationale for these curricular innovations centered on the need for a more relevant curriculum that prepared students for greater career opportunities and more accurately reflected the musical preferences and practices of the local community. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]
- Published
- 2014
49. Intelektinė daugiaagentė mokymosi sistema, naudojanti edukacinių duomenų tyrybą
- Author
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Eugenijus Kurilovas, Jaroslav Meleško, and Irina Krikun
- Subjects
Communication. Mass media ,P87-96 - Abstract
Straipsnyje yra pristatyta mokymosi personalizavimo pagal besimokančiųjų poreikius metodologija, kurioje yra naudojamos intelektinė daugiaagentė mokymosi sistema ir duomenų tyryba. Mokymosi personalizavimas yra įgyvendinamas remiantis keliais metodais. Felderio ir Silverman mokymosi stilių modelis naudojamas besimokančiųjų profiliams kurti, o tikimybiniai tinkamumo rodikliai yra identifikuojami tam, kad būtų galima susieti mokomuosius komponentus (t. y. mokomuosius objektus, mokomąsias veiklas ir mokymosi aplinką) su konkrečių besimokančiųjų mokymosi stiliais. Kitos pasiūlytos mokymosi sistemos kūrimo technologijos yra ontologijos, rekomendavimo sistema, intelektiniai programiniai agentai ir edukacinių duomenų tyryba (mokymosi analitika). Personalizuotais mokomaisiais moduliais čia vadinami moduliai, sudaryti iš mokomųjų komponentų, kurie turi aukščiausius tikimybinius tinkamumo rodiklius konkrečių besimokančiųjų atžvilgiu. Straipsnyje visų pirma yra atlikta intelektinių programinių agentų taikymo švietime sisteminė apžvalga „Clarivate Analytics Web of Science“ duomenų bazėje. Antra, yra aprašyti mokymosi personalizavimo metodai, taikant intelektines technologijas mokomiesiems moduliams, optimizuotiems konkretiems besimokantiesiems, kurti. Sukurti besimokančiųjų profiliai ir personalizuoti mokomieji moduliai yra toliau koreguojami duomenų tyrybos metodais ir priemonėmis. Detaliau yra pristatomas intelektinės daugiaagentės mokymosi sistemos, grįstos minėtomis technologijomis, modelis. Esminiai pasiūlytos technologijos sėkmės veiksniai yra edukologijos atžvilgiu kokybiški mokomųjų komponentų žodynai, mokomųjų komponentų ekspertinis vertinimas jų tinkamumui konkretiems besimokantiesiems įvertinti, taip pat ontologijų, rekomendavimo sistemos, intelektinių programinių agentų ir duomenų tyrybos taikymas.
- Published
- 2018
- Full Text
- View/download PDF
50. 'Something’s Happening Here!': Popular Music Education in the United States
- Author
-
Bryan Powell, Andrew Krikun, and Joseph Michael Pignato
- Subjects
popular music education ,united states ,music history ,modern band ,commercial music ,Music ,M1-5000 - Abstract
Although the number of opportunities to learn popular music in the United States continues to grow, popular music education (PME) programs remain exceptional at primary, secondary, and tertiary levels of institutionalized music education. This article provides insight into the unique characteristics of a number of PME initiatives currently operating in the United States. A historical background is established to provide context regarding the history of PME in the United States. Additionally, a focus on an expanding landscape for American PME is included, as is an examination of six specific initiatives that are particularly noteworthy. This review of popular music programs, initiatives, and institutions illustrates the rapid proliferation of PME programs in the United States that has occurred in the twenty-first century. As this brief snapshot of American institutions and organizations demonstrates, PME in the United States is alive with possibilities and promise.
- Published
- 2015
- Full Text
- View/download PDF
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