133 research outputs found
All timelike supersymmetric solutions of N=2, D=4 gauged supergravity coupled to abelian vector multiplets
No full textThe timelike supersymmetric solutions of = 2, D = 4 gauged supergravity coupled to an arbitrary number of abelian vector multiplets are classified using spinorial geometry techniques. We show that the generalized holonomy group for vacua preserving N supersymmetries is GL((8−N)/2, ) (N/2)(8−N)/2 GL(8, ), where N = 0, 2, 4, 6, 8. The spacetime turns out to be a fibration over a three-dimensional base manifold with U(1) holonomy and nontrivial torsion. Our results can be used to construct new supersymmetric AdS black holes with nontrivial scalar fields turned on
Gravity in the 3+1-split formalism : I. Holography as an initial value problem
No full textWe present a detailed analysis of the 3+1-split formalism of gravity in the presence of a cosmological constant. The formalism helps in revealing the intimate connection between holography and the initial value formulation of gravity. We show that the various methods of holographic subtraction of divergences correspond just to different transformations of the canonical variables, such that the initial value problem is properly set up at the boundary. The renormalized boundary energy–momentum tensor is a component of the Weyl tensor
Mansi Substrate Toponymy on the Territory of the Former Habitation of the Mansi People
No full textThe article summarizes the results of the study of the Mansi substrate toponymy on the territory of the former habitation of the Mansi people based on the materials collected fallowing Artturi Kannisto’s famous works of the first half of the 20th century. The author revises the Mansi toponymy distribution area on the territory of the Urals argued by Kannisto. The article especially focuses on the western border of the area. The mapping of the data revealed in the contemporary Russian toponymy as well as found in historical written sources substantiates the fact that the Mansi people moved to the Middle Urals western slopes from the East relatively late and in insignificate numbers, but did not advance any farther west of the middle course of the Kama river’s left tributaries. The analysis of the Middle Urals Mansi substrate toponymy also helps characterize some phonetic particularities of the local Old Mansi dialects.В статье обобщаются результаты исследований субстратной мансийской топонимии на территории былого проживания манси на основе материалов, накопленных после известных работ А. Каннисто первой половины XX в. По сравнению с А. Каннисто критически пересматривается ареал распространения субстратной мансийской топонимии на территории Среднего Урала и Предуралья. Наибольшее внимание уделяется западным границам этого ареала. На основе картографирования фактов, выявленных как при исследовании современной русской топонимии, так и найденных в исторических письменных источниках, обосновывается вывод о том, что заселение древними манси западных склонов Среднего Урала происходило с востока, оно было достаточно поздним и незначительным, при этом манси в Среднем Предуралье не продвигались западнее среднего течения левых притоков Камы. На основе анализа выявленных фактов субстратной мансийской топонимии на территории Среднего Урала характеризуются отдельные фонетические особенности местных древнемансийских диалектов
On the question of typology of Mansi home sanctuaries
No full textThe article is dedicated to systematization and generalization of ethnographic data about Mansi home sanctuaries. The author considers ethnographic descriptions published in the XVIII — XX centuries and uses her own field data. The author held expeditions to the territory of inhabitance of Northern Mansi in the settlements situated on the banks of the rivers Severnaya Sos’va and Lyapin in 2006–2010 years. Two types of home sanctuaries in traditional Mansi dwelling were marked out during the research. The first type is a holy ceiling, located directly in the living space. The second type is an attic, separated from the living space of the house by a ceiling. The research shows their interrelation and development as well as present functional features. The article also deals with the question of origin of Samsay-oyka, a house guardian spirit of Northern Mansi. The attic is considers as one of the places where it lives. A hypothesis of late formation of the image of Samsay-oyka is formulated
Gravity in the 3+1-split formalism : II. Self-duality and the emergence of the gravitational Chern–Simons in the boundary
No full textWe study self-duality in the context of the 3+1-split formalism of gravity with a non-zero cosmological constant. Lorentzian self-dual configurations are conformally flat spacetimes and have boundary data determined by classical solutions of the three-dimensional gravitational Chern–Simons. For Euclidean self-dual configurations, the relationship between their boundary initial positions and initial velocity is also determined by the three-dimensional gravitational Chern–Simons. Our results imply that bulk self-dual configurations are holographically described by the gravitational Chern–Simons theory which can either be viewed as a boundary generating functional or as a boundary effective action
Effects of different exposure methods to 1-methylcyclopropene on quality of partially ripened bananas
No full text1-Methylcyclopropene (1-MCP) is being widely used as an ethylene antagonist to suppress ethylene induced ripening in fresh produce. It is commercially available in encapsulated form in cyclodextrin, which requires moisture triggers to release from encapsulation. There are several reports on efficiency of 1-MCP for inhibiting the action of ethylene during green life (mature – but unripe stage) of bananas, but the commercialization of 1-MCP application for bananas is still under the area of research due to inconsistence responses received by researchers on its effect. Also, there are limited studies showing its effects on yellow life (at and after partially ripened stage) of bananas, so the further investigation in this area was our subject of interest. In this study, different 1-MCP exposure methods were used to treat bananas to provide the scientific base for developing its commercial application. The overall objective of this study was to provide the better understanding for extending Controlled Release Packaging (CRP) system that can deliver the 1-MCP molecules from the package over longer period of time to increase the yellow life of bananas to maintain greater quality at consumer market. The study was divided into two parts: in the first part, the packaging system was used to treat partially ripened bananas with different 1-MCP exposure methods. The physiological responses of partially ripened bananas to these different 1-MCP exposure methods, controlled exposure (timed release - slow release for longer time) and one-time exposure, were studied. All experiments were conducted on Cavendish bananas (Dole) at partially ripened stage (ripening color stages 3 and 4). In the second part, the feasibility of 1-MCP to be incorporated in the CRP system was studied by controlling 1-MCP release through polyvinyl alcohol (PVA) film and studying its release from cyclodextrin through banana transpiration. The physiological responses showed that both the 1-MCP exposure methods were effective to delay ripening of partially ripened banana by at least 5-6 days. But the one-time exposure method was more effective than controlled exposure after 6 days. The PVA was able to delay the release of 1-MCP: the release of 1-MCP through PVA was nearly 15 % in 6 hours, whereas the release of 1-MCP from cyclodextrin (control- without any film) was 100% in 6 hours. The bananas were able to provide sufficient moisture through transpiration to initiate 1-MCP release from cyclodextrin within the first two hours of the experiment.M.S.Includes bibliographical referencesby Mansi Trived
More on BPS solutions of N=2, D=4 gauged supergravity
No full textWe deepen and refine the classification of supersymmetric solutions to N=2, D=4 gauged supergravity obtained in a previous paper. In the case where the Killing vector constructed from the Killing spinor is timelike, it is shown that the nonlinear partial differential equations determining the BPS solutions can be derived from a variational principle. The corresponding action enjoys a solution-generating PSL(2,R) symmetry. In certain subcases the system reduces to different known theories, like two-dimensional dilaton gravity or the dimensionally reduced gravitational Chern-Simons theory. We find new supersymmetric solutions including, among others, kinks that interpolate between two AdS_4 vacua, electrovac waves on anti-Nariai spacetimes, or generalized Robinson-Trautman solutions. In the case where the Killing vector is null, we obtain a complete classification. The one quarter and one half supersymmetric solutions are determined explicitely, and it is shown that the fraction of three quarters of supersymmetry cannot be preserved. Finally, the general lightlike configuration is uplifted to eleven-dimensional supergravity
The specifics of cutting and decorations of the guardians spirit caps of the Northern Mansi
No full textThe article deals with a study and classification of guardian spirit caps found in Mansi sacred places. The study aims to conduct a comparative and typological analysis of the caps and to reveal special features of their cutting and decorations. The research is based on data of the author’s own fieldwork records (collected during several expedition trips to the communities of Northern Mansi living along the Northern Sosva and Lyapin rivers) and on published ethnographic sources. In the course of the expeditions, the author made descriptions of 34 caps, 21 of them were parts of guardian spirit vestments, 10 were gifts to the guardian spirits and 3 were tailor-made. It is pointed out that the caps are one of the principal and necessary attributes of the male guardian spirits of Northern Mansi. According to Northern Mansi mythology, caps are part of the image and an indispensable attribute of clothes of many Mansi supreme deities, including Mir-Susne-Hum, Kuly-Otir, Samsaj-oyka, etc. The caps are included in the costume kits of the figures of the guardian spirits that are kept in sacred places; they are also a part of the vestments of those people who perform a role of the guardian spirits at on the Bear festival. There are two types of the guardian spirit caps: made of fur and of woolen cloth. The caps made out of woolen cloth are the most common. Depending on the shape of the crown, the caps can be divided into three main groups: cone-shaped, semi-spherical and trapezoidal. Each of these groups is represented by several variations which differ in quantity and shape of details of their cutting. It was noted that the shape, cutting of caps and decoration of a cap are not related to the duties of the corresponding a guardian spirit. Today there is no evidence of use of the fur caps in the Mansi sacred places, though there are many references to their previous use as a head-dress of the guardian spirits in ethnographic sources. Obviously, fur caps, as well as fur-trimmed woolen caps, indicated high social status of their owners
Chern-Simons formulation of three-dimensional gravity with torsion and nonmetricity
No full textWe consider various models of three-dimensional gravity with torsion or nonmetricity (metric affine gravity), and show that they can be written as Chern-Simons theories with suitable gauge groups. Using the groups ISO(2,1), SL(2,C) and SL(2,R)xSL(2,R), and the fact that they admit two independent coupling constants, we obtain the Mielke-Baekler model for zero, positive and negative effective cosmological constant respectively. Choosing SO(3,2) as the gauge group, one gets a generalization of conformal gravity that has zero torsion and only the trace part of the nonmetricity. This characterizes a Weyl structure. Finally, we present a new topological model of metric affine gravity in three dimensions arising from an SL(4,R) Chern-Simons theory
Mansi Lexical Materials in the Manuscript Heritage of the Russian Academician Gottlieb Siegfried Bayer (1694–1738)
No full textThis article analyses the Mansi vocabulary from the handwritten Latin-Tatar-Vogul dictionary kept in Glasgow (Great Britain), in the archive of the Russian academician Gottlieb Siegfried Bayer (1694–1738), which has never been done before. Bayer’s scholarly heritage is of great interest and has not been sufficiently studied yet. The author manages to establish that Bayer’s dictionary is a partial list of lexical materials compiled by another Russian academician, Gerhard Friedrich Mьller (1705–1783), Head of the Academic Unit of the Second Kamchatka (Great Northern) Expedition (1733–1743). It is also established that these Mansi (Vogul) materials were recorded by Müller in Tobolsk in 1734 from a native speaker of the Pelym dialect and preserved in Mьller’s archive in the Russian State Archive of Ancient Acts (RGADA) in Moscow. A comparison of Bayer’s and Mьller’s dictionaries shows that Bayer copied only the most interesting lexemes from Müller — 90 Vogul words, while Müller has about 300 of them. Most of the words copied by Bayer are reflected in lexicographic sources, which makes it possible to trace their correspondences in Mansi dialects, as well as to identify lexical parallels. The article considers several lexemes that are of the greatest interest from the point of view of semantics and word formation. More particularly, the name of the kopeck uses the designation of a ‘squirrel’ as a monetary unit in Siberia, hence ‘rouble’ (Schдtlin) is ‘one hundred kopecks’, or ‘one hundred squirrels’; in the name оf paper, the Mansi ‘birch bark’ (-schasch) is added to the word of Komi origin ‘paper’ (nepag). Additionally, the author reveals lexemes that are not marked in dictionaries or have other semantics, i.e. the name of the ‘water spirit’ (Uнtkas) is used to denote ‘the devil’; the adverb ‘above’ (Nùmna) is used to denote ‘the sky’; the month as a period of time is denoted by ‘four weeks’ (Nille-Sat); ‘the cloudberry colour’ (Morochoschp) juxtaposition is used to denote ‘yellow’. Finally, the article mentions some inaccuracies made by Bayer when copying Mьller’s dictionary
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