16,020 research outputs found
Szekeres-type mappings of Kasner and Petrov type I(M+) purely magnetic spacetimes
No full textWe show that Szekeres-type mappings of Kasner spacetime generate a 2-variable Haddow magnetic spacetime of Petrov type I(M∞) and of Segré type. It is then shown that this spacetime is unique for the generating functions of 3- or 4-variable generalizations. Moreover, sufficient conditions on the variable dependence of the metric coefficients distinguishing types I(M∞) and I(M+) are established for diagonal purely magnetic spacetimes. These results are then combined by embedding the 2-variable Haddow magnetic spacetime within a diagonal spacetime such that the resulting spacetime is of Petrov type I(M+), in general. In turn, this leads to a family of non-vacuum purely magnetic spacetimes of Petrov type I(M+). It is then shown that either the anisotropic pressure tensor or heat-flux vector can be set to zero. Notably, the former class contains a sub-class of Haddow magnetic spacetimes also of Petrov type I(M+). Finally, the possibility of conformally relating the general family of non-vacuum purely magnetic spacetimes to vacuum is shown not to be possible
A class of Petrov-Galerkin finite element methods for the numerical solution of the stationary convection-diffusion equation.
No full textA class of Petrov-Galerkin finite element methods is proposed for the numerical solution of the n dimensional stationary convection-diffusion equation. After an initial review of the literature we describe this class of methods and present both asymptotic and nonasymptotic error analyses. Links are made with the classical Galerkin finite element method and the cell vertex finite volume method. We then present numerical results obtained for a selection of these methods applied to some standard test problems. We also describe extensions of these methods which enable us to solve accurately for derivative values of the solution
Melanesicus caledoniae Beaver & Petrov & Sittichaya 2021, comb. n.
No full textMelanesicus caledoniae (Beaver & Liu) comb. n. Xyleborus caledoniae Beaver & Liu 2016: 26. Taxonomy. The senior author has examined the holotype (MNHN) and paratypes (QMB, RAB). A. Petrov has examined a further specimen from New Caledonia. The species is distinguished from other species of Melanesicus primarily by its elytral sculpture (see key above, and Beaver & Liu 2016). Distribution. The species is endemic to New Caledonia. New record: NEW CALEDONIA: S-Prov. Refuge de Plano, 2 km NNE Farino, 21°38’55’’S 165°46’53’’E, ca. 270 m, at light, 28.-30.XI.2009, Schuh (1) (APP). Biology. Unknown. Remarks. Photographs of female and male are included in Beaver & Liu (2016, Figs 5‒8).Published as part of Beaver, R. A., Petrov, A. V. & Sittichaya, W., 2021, A new genus of ambrosia beetle from Melanesia (Coleoptera: Curculionidae Scolytinae: Xyleborini), pp. 163-172 in Zootaxa 4949 (1) on page 169, DOI: 10.11646/zootaxa.4949.1.9, http://zenodo.org/record/463608
Aspects des déserts : Petrov (M.), Deserts of the world
No full textTricart Jean. Aspects des déserts : Petrov (M.), Deserts of the world. In: Annales de Géographie, t. 87, n°479, 1978. pp. 89-94
Inflation expectations in the United States
No full textPričakovanja v gospodarstvu imajo moč vpliva na prihodnje stanje ekonomije. Inflacijska pričakovanja so še zlasti pomembna, saj se nanašajo na temeljno problematiko v ekonomiji, ki je inflacija. Diplomsko delo predstavlja vpliv inflacijskih pričakovanj na potrošniško vedenje, investicijske odločitve ter na oblikovanje in izvajanje denarne politike zveznih rezervnih bank v ZDA. Poseben poudarek je namenjen vplivu pandemije covid-19 na spremembe v kratkoročnih in dolgoročnih inflacijskih pričakovanjih.
Na osnovi podatkov med leti 2013 in 2024 smo analizirali nihanja ravni pričakovanj pred, med in po pandemiji, pri čemer smo upoštevali demografske spremenljivke, kot so starost, dohodek in izobrazba. Predstavili smo razmerje med dejansko inflacijo in inflacijskimi pričakovanji ter analizirali posledice gospodarskega šoka v tekočem obdobju. Za učinkovito delovanje in višanje odpornosti gospodarstva, morajo oblikovalci gospodarskih politik ne le ohranjati stabilno inflacijsko stopnjo, ampak vzdrževati optimistična pričakovanja med potrošniki.Expectations in the economy have the power to influence its future state. Inflation expectations are particularly important, as they relate to a fundamental issue in the economy: inflation. This thesis presents the impact of inflation expectations on consumer behavior, investment decisions, and the formulation and implementation of monetary policy by the Federal Reserve Banks in the United States. Particular emphasis is placed on the impact of the COVID-19 pandemic on changes in short- and long-term inflation expectations.
Using data from 2013 to 2024, we analyze fluctuations in expectations levels before, during, and after the pandemic, considering demographic variables such as age, income, and education. We will present the relationship between actual inflation and inflation expectations and analyze the consequences of an economic shock in the current period. To function effectively and increase the resilience of the economy, economic policymakers need to maintain not only a stable inflation rate but also optimistic expectations among consumers
Odes by V. P. Petrov and odes by M. V. Lomonosov: Word and rhythmic-syntactic formulas
No full textThe proposition that V. P. Petrov used to borrow formulas from M. V. Lomonosov’s odic poetry
has become generally accepted by literary critics since N. I. Novikov and his contemporaries.
But still there is no detailed description and classification of these borrowings. The article
focuses on the word and rhythmic-syntactic formulas in оdes by Petrov which traces back
to Lomonosov’s poetry. The data for study are iambic tetrameter panegyric odes written by
Petrov in 1766–1796. Four levels of probable borrowings are revealed: a single word, a combination
of words, a single poetic line, and a text fragment. When describing the formulas in the
single poetic lines, we analyze, following M. L. Gasparov, such phenomena as rhythmic cliché,
syntactic cliché, rhythmic-syntactic cliché and rhythmic-syntactic formula (cliché incorporating
recurrent lexicon). As a special form of borrowing we reveal Petrov’s poetic lines which
copy the poetic lines from Lomonosov’s panegyric odes. When describing the borrowings in
the text fragments, we show the examples when Petrov’s two adjacent lines correspond to Lomonosov’s
two adjacent lines, borrowings of rarely recognized Lomonosov’s rhymes, similar
big fragments of the panegyric odes which sometimes are in the same position in the text.
Special attention is paid to Petrov’s strategies of intertextual borrowings: the construction of
verse line from words of Lomonosov’s adjacent lines, preference of inversion, using synonyms
as a means of dissimilation. The described data show that Petrov in his panegyric odes reproduce
not only «ready-made» lexicon (words and word combinations) but also rhythmic and
intonation models and composition structures typical to Lomonosov’s odic verse
Exhibiting Fashion Symposium: Dr. Julia Petrov “The History of Fashion Curation”
No full textThe Museum at FIT presented Exhibiting Fashion, its twenty-first academic symposium on Friday, March 8, 2019. This symposium explored the history of fashion curating, the different ways fashion is displayed in museum settings, and how national and regional identities influence fashion exhibitions. The symposium was organized in conjunction with Exhibitionism: 50 Years of The Museum at FIT, which commemorated the rich history of the museum, the site of more than 200 exhibitions since the 1970s.Dr. Julia Petrov is the curator of Western Canadian history at the Royal Alberta Museum in Edmonton. She writes about museology, fashion, gender, and popular culture, and is the author of the book Fashion, History, Museums: Inventing the Display of Dress
Melanesicus partitus Beaver & Petrov & Sittichaya 2021, comb. n.
No full textMelanesicus partitus (Browne) comb. n. (Figs 11‒12) Xyleborus partitus Browne 1974: 69. Taxonomy. The senior author has examined the holotype and a paratype (NHML), and specimens in RAB. Schedl (1980) considered that Xyleborus granulosus was a synonym of this species, but the two species were distinguished by Beaver (1991). Distribution. The species is endemic to Fiji, where it occurs in both high and low altitude rain forest (Roberts 1977). Biology. Roberts (1977) described in detail the gallery system, brood size and development, and noted associated species of ambrosia beetles. He recorded the species from nine different families of host trees (Roberts 1977). It is evidently polyphagous. In contrast to M. deformatus (see above), emergence is probably confined to the day, and the species was never taken at light (Roberts 1977).Published as part of Beaver, R. A., Petrov, A. V. & Sittichaya, W., 2021, A new genus of ambrosia beetle from Melanesia (Coleoptera: Curculionidae Scolytinae: Xyleborini), pp. 163-172 in Zootaxa 4949 (1) on page 171, DOI: 10.11646/zootaxa.4949.1.9, http://zenodo.org/record/463608
Melanesicus deformatus Beaver & Petrov & Sittichaya 2021, comb. n.
No full textMelanesicus deformatus (Browne) comb. n. (Figs 9‒10) Xyleborus deformatus Browne 1974: 70. Taxonomy. The senior author has examined the holotype and paratypes (NHML) and specimens in RAB. The species is easily distinguished by the strong, saddle-shaped impression of the elytral disc just before the declivity. Distribution. The species is endemic to Fiji, where it occurs only in the higher altitude rain forest (Roberts 1977). Biology. Roberts (1977) described the biology of the species, including the gallery system, development, brood sizes, and notes associated species of Scolytinae and Platypodinae, as well as nest parasites (Cyphagogus fijianus Kleine) (Coleoptera: Brentidae). He recorded the species most frequently from Dysoxylum spp. (Meliaceae), but also from single host trees in three other families (Roberts 1977). RAB collected the species only from Dysoxylum sp., and it appears to have a strong host preference for this genus. In contrast to M. partitus (see below), the adults emerge around dusk, and are strongly attracted to light (Roberts 1977).Published as part of Beaver, R. A., Petrov, A. V. & Sittichaya, W., 2021, A new genus of ambrosia beetle from Melanesia (Coleoptera: Curculionidae Scolytinae: Xyleborini), pp. 163-172 in Zootaxa 4949 (1) on pages 169-170, DOI: 10.11646/zootaxa.4949.1.9, http://zenodo.org/record/463608
The scientific cooperation of V. M. Peretts and M. I. Petrov through the prism of epistolary sources
No full textIn the article based on the analysis of letters of prominent Ukrainian and Russian philologist, historian of Ukrainian literature, the academician of the St. Petersburg and All-Ukrainian Academies of Sciences V. M. Peretts’s to the Ukrainian literary critic, art critic, historian of church and Ukrainian science, the corresponding member of the St. Petersburg Academy of Sciences, the academician of the All-Ukrainian Academy of Sciences M. I. Petrov, many years of scientifi c cooperation and creative connections between the scientists are shown. The source of the study is the correspondence of V. M. Peretts, which is deposited in the funds of the Institute of Manuscript of Vernadsky National Library of Ukraine and has never been a subject of special scientific research. The article refl ects activities of V. M. Peretts and M. I. Petrov in the study of ancient books and manuscripts, which are deposited in the Church Archaeological Museum of the Kyiv Theological Academy, the library of the Saint Sophia Cathedral in Kyiv, and also in the study of documents on the Kyiv-Mohyla Academy in the archives of the Holy Synod in St. Petersburg. The paper highlights the scientifi c cooperation of V. M. Peretts and M. I. Petrov on the study of the history of Ukrainian literature and the Ukrainian theater, publication of scientifi c works in academic editions as members of the St. Petersburg Academy of Sciences. Special attention is paid to the little investigated facts of biographies of the scientists. In the article conclusions about considerable infl uence of M. I. Petrov’s on V. N. Peretts’s formation as a scientist are made, and the author claims that the scientists’ professional and personal relations based on such feelings as mutual respect, aspiration to creative research and desire to be useful to the Ukrainian science. Further studies of epistolary heritage of V. M. Peretts in archival and library funds of Ukraine will give the chance to open a role and a contribution of the Ukrainian philologists to the development of Ukrainian research and creation of the Ukrainian scientific life
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