291 research outputs found
Geo-simulation approach to modelling spatial objects and its application to creating thermokarst lake model using remote sensing data
Negative parity states of B and C and the similarity with $^{12}C
The negative parity states of B and C were studied based on the
calculations of antisymmetrized molecular dynamics(AMD). The calculations well
reproduced the experimental strengths of Gamov-Teller(GT), and monopole
transitions. We, especially, focused on the and states, for
which GT transition strengths were recently measured. The weak and GT
transitions for the in B and C are described by a
well-developed cluster structure of + and +He,
respectively, while the strong transitions for the is characterized
by an intrinsic spin excitation with no cluster structure. It was found that
the state is a dilute cluster state, and its features are similar to
those of the C which is considered to be a gas state of three
clusters.Comment: 10 pages, 4 figures, submitterd to Physical Review
The dynamic of secondary hemorrhagic progression of contusion in traumatic brain injury
Vyval M. B., Polishchuk M. E., Perekopaiko Y. M. The dynamic of secondary hemorrhagic progression of contusion in traumatic brain injury. Journal of Education, Health and Sport. 2017;7(1): 369-376. eISSN 2391-8306. DOI http://dx.doi.org/10.5281/zenodo.292929http://ojs.ukw.edu.pl/index.php/johs/article/view/4271 The journal has had 7 points in Ministry of Science and Higher Education parametric evaluation. Part B item 754 (09.12.2016).754 Journal of Education, Health and Sport eISSN 2391-8306 7© The Author (s) 2017;This article is published with open access at Licensee Open Journal Systems of Kazimierz Wielki University in Bydgoszcz, PolandOpen Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License(http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited.This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited.The authors declare that there is no conflict of interests regarding the publication of this paper.Received: 02.01.2017. Revised 16.01.2017. Accepted: 24.01.2017. УДК 616.831-001.3-005.1 The dynamic of secondary hemorrhagic progression of contusion in traumatic brain injury M. B. Vyval, M. E. Polishchuk, Y. M. Perekopaiko Department of Neurosurgery, National Medical Academy of Postgraduate Education named after P.L. Shupik, Ministry of Health of Ukraine, Kyiv, UkraineTraumatology Department, Ternopil City Municipal Hospital of Emergency medicine , Ternopil, Ukraine AbstractIntroduction. Secondary posttraumatic changes in the brain often determine the clinical flow during traumatic brain injury (TBI). Prevention and early detection of secondary hemorrhagic progression (SHP) is very important for determination of the treatment strategy in patients with brain contusion.We studied the dynamic of brain contusion and its impact on the clinical course of brain injury. We found that the secondary hemorrhagic progression of contusion occurs in 43% and can be detected at the place of primary brain damage, and far away from it, and often can be seen in patients with a subdural hematoma. The larger contusion has the greater probability of progression and needs for surgical decompression. Progression is associated with the significant risk of clinical deterioration and mortality.Conclusions. Treatment tactics depends on severity of volumetric effect on the surrounding brain structures and manifestations of herniation syndrome. Key words: traumatic brain injury, brain contusion, secondary hemorrhagic progression of contusion
ФІЛЬТРАЦІЯ СТРУМІВ В ТРИФАЗНІЙ ТРИПРОВОДНІЙ СИСТЕМІ ЕЛЕКТРОЖИВЛЕННЯ ПРИ НЕСИМЕТРИЧНИХ СИНУСОЇДНИХ НАПРУГАХ
Purpose. Investigation of the optimal current distribution between source, shunt active filter and reactive compensator of a three-phase three-wire system that provides consumption of a sinusoidal symmetric current under asymmetric source voltages with minimal power losses was provided. Methodology. The tasks were solved by conducting theoretical and experimental studies. The main provisions of the theory of electrical circuits, the apparatus of mathematical analysis, methods for solving linear differential and algebraic equations, elements of matrix and complex calculus and vector algebra are used. During the development, modern methods and software of computer simulation of electrical engineering complexes and dynamic systems were applied: Matlab-Simulink, MATHCAD. Originality. The principle of compensating current distribution between PAF and reactive compensator of a three-phase three-wire power system with asymmetric sinusoidal voltage was proposed at which the input current is equal to the positive-sequence active current and rms value of PAF current is minimal. The feasibility to compensate the inactive sinusoidal Fryze current by reactive elements under arbitrary combination of load and source parameters was proved and expression for direct calculation of the reactive compensator parameters for generation of inactive Fryze current in the source unbalanced mode was obtained. Practical value. The simulative example for transmission line load showed that combined application of PAF and reactive compensator with the specified distribution of compensating currents ensured a reduction of power losses in 3.273 times and rms value of the SAF current is 12.9 % of rms value total compensation current.Розглянуто принципи активної фільтрації струму в трифазній трипровідній системі електроживлення при несиметричному синусоїдному джерелі живлення, що задовольняють вимогам стандарту IEEE Std.1459-2010. Показано переваги формування синусоїдного симетричного вхідного струму при паралельному підключенні активного фільтра та реактивного компенсатора. Доведено можливість компенсації неактивного синусоїдного струму Фрізе реактивними елементами при довільній комбінації параметрів лінійного навантаження та джерела. Отримана формула прямого розрахунку параметрів реактивного компенсатора для генерації неактивного струму Фрізе в несиметричному режимі трифазного джерела. Наводяться результати чисельного моделювання
Mirror duality and noncommutative tori
In this paper, we study a mirror duality on a generalized complex torus and a
noncommutative complex torus. First, we derive a symplectic version of Riemann
condition using mirror duality on ordinary complex tori. Based on this we will
find a mirror correspondence on generalized complex tori and generalize the
mirror duality on complex tori to the case of noncommutative complex tori.Comment: 22pages, no figure
Mirror symmetry and quantization of abelian varieties
The paper consists of two sections. The first section provides a new
definition of mirror symmetry of abelian varieties making sense also over
-adic fields. The second section introduces and studies quantized
theta-functions with two-sided multipliers, which are functions on
non-commutative tori. This is an extension of an earlier work by the author. In
the Introduction and in the Appendix the constructions of this paper are put
into a wider context.Comment: 24 pp., amstex file, no figure
Mixed-symmetry massive fields in AdS(5)
Free mixed-symmetry arbitrary spin massive bosonic and fermionic fields
propagating in AdS(5) are investigated. Using the light-cone formulation of
relativistic dynamics we study bosonic and fermionic fields on an equal
footing. Light-cone gauge actions for such fields are constructed. Various
limits of the actions are discussed.Comment: v3: 24 pages, LaTeX-2e; typos corrected, footnote 7 and 2 references
added, published in Class. Quantum Gra
Low temperature breakdown of coherent tunneling in amorphous solids induced by the nuclear quadrupole interaction
We consider the effect of the internal nuclear quadrupole interaction on
quantum tunneling in complex multi-atomic two-level systems. Two distinct
regimes of strong and weak interactions are found. The regimes depend on the
relationship between a characteristic energy of the nuclear quadrupole
interaction and a bare tunneling coupling strength
. When , the internal interaction is
negligible and tunneling remains coherent determined by . When
, coherent tunneling breaks down and an effective
tunneling amplitude decreases by an exponentially small overlap factor
between internal ground states of left and right wells of a
tunneling system. This affects thermal and kinetic properties of tunneling
systems at low temperatures . The theory is applied for
interpreting the anomalous behavior of the resonant dielectric susceptibility
in amorphous solids at low temperatures mK where the nuclear
quadrupole interaction breaks down coherent tunneling. We suggest the
experiments with external magnetic fields to test our predictions and to
clarify the internal structure of tunneling systems in amorphous solids.Comment: To appear in the Physical Review
СПОСОБИ МІНІМІЗАЦІЇ НЕБАЖАНИХ СКЛАДОВИХ МИТТЄВОЇ ПОТУЖНОСТІ ІЗ ЗАСТОСУВАННЯМ ПАРАЛЕЛЬНИХ АКТИВНИХ ФІЛЬТРІВ
The possibilities of compensation of unwanted components of instantaneous power, which are provided by different topologies of active filters, are considered. Correlation is obtained, which provides a simplified calculation of the compensator currents without the use of coordinate transformations. The set of instantaneous power components, which reflects p-q-r theory, is considered, the basic conditions of their appearance and methods of compensation are given. Bible 3, tab. 1Рассмотрены возможности компенсации нежелательных составляющих мгновенной мощности, предоставляемые различными топологиями активных фильтров. Получены соотношения, обеспечивающие упрощенный расчет токов компенсатора без применения преобразований координат. Рассмотрена совокупность составляющих мгновенной мощности, которые отражает p-q-r теория, и приведены основные условия их появления и способы компенсации. Библ. 3, табл. 1.Розглянуто можливості компенсації небажаних складових миттєвої потужності, які надаються різними топологіями активних фільтрів. Отримано співвідношення, які забезпечують спрощений розрахунок струмів компенсатора без застосування перетворень координат. Розглянуто сукупність складових миттєвої потужності, які відображає p-q-r теорія, наведено основні умови їх появи та способи компенсації. Бібл. 3, табл. 1
Schr\"odinger Deformations of AdS_3 x S^3
We study Schr\"odinger invariant deformations of the AdS_3 x S^3 x T^4 (or
K3) solution of IIB supergravity and find a large class of solutions with
integer and half-integer dynamical exponents. We analyze the supersymmetries
preserved by our solutions and find an infinite number of solutions with four
supersymmetries. We study the solutions holographically and find that the dual
D1-D5 (or F1-NS5) CFT is deformed by irrelevant operators of spin one and two.Comment: 23 page
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