1,170 research outputs found
Зимовий бал Тетяни Клименко
Висвітлено трудовий шлях директора Державного архіву Черкаської
області Тетяни Анатоліївни Клименко, яка понад двадцять років працює в архіві.Освещён трудовой путь директора Государственного архива Черкасской
области Татьяны Анатольевны Клименко, которая более двадцати лет своей
жизни посвятила архивному делу.The article was written on the occasion of fiftieth birthday of the director of
The State Archives of Cherkassy region Klymenko Tetyana, whose twenty years
seniority is connected with Cherkassy Archives
Політичні стереотипи та стереотипізація мислення: роль та значення у системі іміджевих комунікацій
Всебічно розглянуто особливості стереотипізації мислення як важливого чинника
у процесі сприйняття та аналізу особою або групою осіб суспільно-політичної
дійсності.
Досліджено природу, джерела та механізми формування політичних стереотипів
та показано їх роль і значення у системі іміджевих комунікацій. Наголошено на
необхід-
ності аналізу існуючої системи стереотипів при створенні іміджу суб’єкта політики.There have been thoroughly examined peculiarities of stereotyping of thinking as an
important factor in the process of perception and analysis of socio-political reality by a
person
or a group of people. There have been investigated the nature, sources and
mechanism of
political stereotypes formation and showed their role and meaning in the system if
image
communications. There has been put an emphasis on the necessity of analysis of the
existing
system of stereotypes while creating the image of a subject of policy
The Post-Merger Magnetized Evolution of White Dwarf Binaries: The Double-Degenerate Channel of Sub-Chandrasekhar Type Ia Supernovae and the Formation of Magnetized White Dwarfs
Type Ia supernovae (SNe Ia) play a crucial role as standardizable
cosmological candles, though the nature of their progenitors is a subject of
active investigation. Recent observational and theoretical work has pointed to
merging white dwarf binaries, referred to as the double-degenerate channel, as
the possible progenitor systems for some SNe Ia. Additionally, recent
theoretical work suggests that mergers which fail to detonate may produce
magnetized, rapidly-rotating white dwarfs. In this paper, we present the first
multidimensional simulations of the post-merger evolution of white dwarf
binaries to include the effect of the magnetic field. In these systems, the two
white dwarfs complete a final merger on a dynamical timescale, and are tidally
disrupted, producing a rapidly-rotating white dwarf merger surrounded by a hot
corona and a thick, differentially-rotating disk. The disk is strongly
susceptible to the magnetorotational instability (MRI), and we demonstrate that
this leads to the rapid growth of an initially dynamically weak magnetic field
in the disk, the spin-down of the white dwarf merger, and to the subsequent
central ignition of the white dwarf merger. Additionally, these magnetized
models exhibit new features not present in prior hydrodynamic studies of white
dwarf mergers, including the development of MRI turbulence in the hot disk,
magnetized outflows carrying a significant fraction of the disk mass, and the
magnetization of the white dwarf merger to field strengths
G. We discuss the impact of our findings on the origins, circumstellar media,
and observed properties of SNe Ia and magnetized white dwarfs.Comment: Accepted ApJ version published on 8/20/13, with significant
additional text added discussing the nature of the magnetized outflows, and
possible CSM observational features relevant to NaID detection
Щоденники експедиційної роботи Григорія Дем'яна (Вступна стаття та підготовка текстів Василя Сокола)
The interaction between S(-II) and ferric oxides exerts a major control for the sulphur and iron cycle and in particular for the carbon and electron flow in many aquatic systems. It is regarded to be a key reaction leading ultimately to pyrite formation, the pathways still remaining unresolved. We have studied the reaction between lepidocrocite (γ-FeOOH, 21–42 mmol L−1) and dissolved S(-II) (3–9 mmol L−1) in batch experiments at pH 7 in a glove box using TEM, XRD, Mössbauer spectroscopy, and wet chemistry extraction to explore the nanocrystalline products forming at different time steps in close contact to the lepidocrocitesurface. S(0) and acid extractable Fe(II) (Fe(II)HCl) were the main products detected by wet chemistry extraction. The reaction could be divided into three steps: a rapid (<15 min) consumption of dissolved S(-II), formationof S(0) and the build-up of an Fe(II)HCl pool. Then in the absence of dissolved S(-II) concentrations of S(0) and Fe(II)HCl increased only slightly. TEM measurements revealed the occurrence of a mackinawite rim covering the lepidocrocite crystals and being separated from the lepidocrocitesurface by an interfacial magnetite layer that can be regarded as a steady state product of the interaction between lepidocrocite and mackinawite. A significant fraction of Fe(II) was formed in excess to FeS within the first 2 h. The amount of this fraction increased with decreasing ratio between dissolved S(-II) concentration and the concentration ofsurface sites, which we attributed to a kinetic decoupling of S(-II) oxidation and Fe(II) detachment from the lepidocrocitesurface. At low ratios, S(-II) seems to transfer electrons to lepidocrocite faster then stoichiometric amounts of FeS could. After 2 days Fe(II)HCl and S(0) started to decrease resulting in pyrite formation accompanied by traces of magnetite. TEM measurements indicated that mackinawite completely dissolved and precipitation of pyrite occurred dislocated from the lepidocrocitesurface. The absence of dissolved sulphide under these conditions suggest that excess Fe(II) is involved in the formationof polysulphides which are key precursors during pyrite formation. We propose that the occurrence of excess Fe(II) is a common phenomenon particularly in low sulphide – high iron environments attributing significant reactivity to ferric (hydr)oxide
Морфогенез структуры клеток и сосудов миокарда у экспериментальных животных с моделированным ЮРА
В статье проанализированы морфологические изменения сердечно-сосудистой системы при моделировании ювенильного ревматоидного артрита на 24 белых чистопородных крысах «Wistar». Проведено морфологическое исследование миокарда у животных с экспериментально вызванным ЮРА в зависимости от методов лечения - гормональная терапия и метаболическая коррекция. Дистрофические и деструктивные процессы миокарда в условиях данного эксперимента свидетельствуют о необходимости метаболической коррекции.In the article morphological cardiovascular system analyzed the experimentally caused juvinal rheumatoid arthritis on the 24 white breed «Wistar» rats. It was carried out morphological research of hearts of animals with rheumatoid arthritis depending on the methods of treatments – hormonal therapy and metabolic correction. Dystrophy and disturbance of cardiovascular system of this experiment testifies to necessity of metabolic correction
Тренинговые услуги в украинском туризме: состояние, тенденции, проблемы
Целью данной статьи является анализ места и роли тренингов в системе туризма Украины на фоне общемировых тенденций
General relativity as an effective field theory: The leading quantum corrections
I describe the treatment of gravity as a quantum effective field theory. This
allows a natural separation of the (known) low energy quantum effects from the
(unknown) high energy contributions. Within this framework, gravity is a well
behaved quantum field theory at ordinary energies. In studying the class of
quantum corrections at low energy, the dominant effects at large distance can
be isolated, as these are due to the propagation of the massless particles
(including gravitons) of the theory and are manifested in the
nonlocal/nonanalytic contributions to vertex functions and propagators. These
leading quantum corrections are parameter-free and represent necessary
consequences of quantum gravity. The methodology is illustrated by a
calculation of the leading quantum corrections to the gravitational interaction
of two heavy masses.Comment: 34 pages, Latex, UMHEP-40
Geo-scientific characterisation of the Boom Clay in the Netherlands in light of permanent confinement of radio-active waste
Recently, the OPERA research program has been initiated in the Netherlands. Its central objective is to develop initial, conditional safety cases for repositories in the Boom Clay and Zechstein rocksalt formations. TNO Geological Survey of the Netherlands has been granted two projects that deal with the geoscientific characterisation of the Tertiairy Boom Clay in the Netherlands, one of which is in cooperation with Utrecht University. The set-up of these projects is presented..
QED Corrections to Neutrino Electron Scattering
We evaluate the O(alpha) QED corrections to the recoil electron energy
spectrum in the process nu_l + e --> nu_l + e (+gamma), where (+gamma)
indicates the possible emission of a photon and l=e, mu or tau. The soft and
hard bremsstrahlung differential cross sections are computed for an arbitrary
value of the photon energy threshold. We also study the O(alpha) QED
corrections to the differential cross section with respect to the total
combined energy of the recoil electron and a possible accompanying photon.
Their difference from the corrections to the electron spectrum is investigated.
We discuss the relevance and applicability of both radiative corrections,
emphasizing their role in the analysis of precise solar neutrino electron
scattering experiments.Comment: 14 pages + 10 figures. Minimal changes, published versio
- …