140 research outputs found
LASERCOOLED RaF AS A LABORATORY FOR TESTING FUNDAMENTAL SYMMETRIES
No full textAuthor Institution: Clemens-Schopf Institute, Technical University of Darmstadt, 64287 Darmstadt, GermanyModern spectroscopical methods allow to reach an accuracy in measurements of molecular spectra that is sufficient for testing symmetry violation in fundamental weak interactions. As was demonstrated in recent experimental search for a permanent electric dipole moment of the electron in YbF [1] and PbO [2], diatomic molecules with an open electronic shell present extremely powerful instrument to study violations of space parity (-odd) and space parity and time reversal (-odd) symmetries. In this talk we discuss the enhancement of -odd and -odd effects in diatomic molecules and consider some prospective candidates for carrying out successful measurements. Radium monofluoride is shown to be a very prospective molecular candidate for observing possible symmetry violations due to its predicted suitability to direct laser cooling [3], large enhancement factors (both electronic and nuclear) [4] and efficient (for the given class of molecules) production route. \\~ REFERENCES: \begin{enumerate} \item J. J. Hudson, D. M. Kara, I. J. Smallman, B. E. Sauer, M. R. Tarbutt and E. A. Hinds, Nature, 473 (2011) \item S. Eckel, P. Hamilton, E. Kirilov, H.W. Smith and D. DeMille, http://arxiv.org/abs/1303.3075v1 \item T. A. Isaev, S. Hoekstra and R. Berger, Phys.Rev.A, 82, 5, 2010 \item T. A. Isaev and R. Berger, http://arxiv.org/abs/1302.5682 \end{enumerate
Manin Matrices for Quadratic Algebras
No full textWe give a general definition of Manin matrices for arbitrary quadratic algebras in terms of idempotents. We establish their main properties and give their interpretation in terms of category theory. The notion of minors is generalised for a general Manin matrix. We give some examples of Manin matrices, their relations with Lax operators, and obtain the formulae for some minors. In particular, we consider Manin matrices of the types , , and introduced by A. Molev and their relation with Brauer algebras. Infinite-dimensional Manin matrices and their connection with Lax operators are also considered.The author is grateful to A. Chervov, V. Rubtsov, An. Kirillov, A. Isaev, and A. Molev for useful discussions and advice. The author would like to thank anonymous referees for their attentive reading and numerous useful comments and remarks
Novel base-catalyzed acylation of benzene diols with vinyl acetate: A Hirshfeld surface study
No full textThe present work describes the facile, fast, and economic base-catalyzed acylation of benzene diols with vinyl acetate. The Hirshfeld surface analysis of benzene-1,4-diol O,Oʹ-diacetate is also described. NaOH, KOH, and K2CO3 were the bases used for the catalyzation of the acylation of benzene-1,x-diols (x = 2, 3, 4) with vinyl acetate to obtain the corresponding O,Oʹ-diacetyl derivatives. The yields were quite good up to 99 % under solvent-free conditions. This method represents an alternative “green” process for the preparation of O-acetyl derivatives of hydroxyaryles. The benzene-1,4-diol O,Oʹ-diacetate crystal structure was obtained and described using the Hirshfeld surface analysis. A noticeable contribution of the C∙∙∙H contacts is shown (16.7 %), despite the insignificant area of the Hirshfeld surface occupied by the carbon atoms (9.4 %). By using 2D fingerprint plots, it was proved that C∙∙∙H contacts were due to the presence of π-stacking. The O∙∙∙H contacts (41.4 %) were the most numerous ones, relating mainly to the typical hydrogen bonds (de + di ≈ 2.6 Å). The high saturation of the C∙∙∙H and O∙∙∙H contacts [enrichment ratios (E) = 1.30 and 1.36 respectively]; despite their smaller contribution to the overall surface as compared to the H∙∙∙H contacts (E = 0.84); is shown. The novelty of this work is the development of a method; based on an inexpensive, safer, and easier-to-use catalyst (K2CO3). This method is fast with high yields. Besides, it may be used for the acylation at an industrial scale
Correction: Isaev et al. Accounting for Dissolved Organic Nutrients in an SPBEM-2 Model: Validation and Verification. Water 2020, 12, 1307
No full textError in Figure 11 [...
AUTHOR STRATEGIES IN RYURIK IVNEV’S “SUN IN THE COFFIN”. BOOK OF POEMS
No full textThe author’s problem in Ryurik Ivnev’s ‘The Sun in the Coffin’ (1921) is studied from the author’s perspectives. It is concluded that at least three Ryurik Ivnev’s strategies as an author can be distinguished: the first, the least obvious, coming from his youthful excitement about Nadson’s neo-romantic poetry, Baudelaire’s and Blok’s symbolism and appearing in a very weakened form, can be called a decadent one. The second strategy is determined by the poet’s recent belonging to egofuturism. The third one was formed under the influence of imaginism aesthetics, to which the poet was attracted when writing the book. Ryurik Ivnev’s strategies, spontaneously but sometimes consciously, were aimed at forming the literary image of the author, identified with the persona. The themes and motives of the book are concentrated around the hypertrophic and screened in the text «I» which becomes the center of Ryurik Ivnev’s poetic worldview. All the strategies are intricately intertwined and give rise to the quality of the style that distinguishes sharply ‘The Sun in the Coffin’ against the background of the Russian poetry of the 1920s and which can be referred to as surrealism
Split Casimir Operator and Universal Formulation of the Simple Lie Algebras
No full textWe construct characteristic identities for the split (polarized) Casimir operators of the simple Lie algebras in adjoint representation. By means of these characteristic identities, for all simple Lie algebras we derive explicit formulae for invariant projectors onto irreducible subrepresentations in T⊗2 in the case when T is the adjoint representation. These projectors and characteristic identities are considered from the viewpoint of the universal description of the simple Lie algebras in terms of the Vogel parameters
Музейное дело в годы Великой Отечественной войны (историографический обзор)
No full textIn the article, the problem of reflection in scientific literature of history of museum affairs
during the Great Patriotic War is considered. The main attention is concentrated on the
analysis of the works devoted to the main activities of the central and provincial museums
during the military period
Таможенно-тарифный протекционизм в России в XVII - начале XVIII вв.
No full textThe article reveals an important issues of the economic history of Russia in the 17th - early 18th centuries. The authors analyze the government's trade policy to limit the economic activity of foreign merchants in the Russian market. They also focus on the causes, circumstances and peculiarities of the overgrowth of trade protectionism into the policy of industrial protectionism, clarify the importance of customs regulation as the main tool for suppressing the activity of foreigners in the Russian domestic market. Believing that such a policy was in the interests of the treasury, the leaders of the Russian merchant class and the Russian Orthodox Church, the authors emphasize its differences from Western European mercantilism, which attached special importance to the development of export industries of manufacturing industry and the export of finished products to other countries. In their view, the customs reform of the mid-17th century did not actually pursue any patronizing goals for the development of domestic production. Defending the thesis about the establishment of large-scale industry in Russia in the first quarter of the 18th century, they assign the main role to the customs and tariff policy in updating the country's production apparatus. The authors assert that in its content the elements of industrial protectionism, which, in the final analysis, determined the content of the tariff of 1724, became more and more confident
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