193 research outputs found
Impact of lattice vibrations on equation of state of the hardest boron phase
No full textAn accurate equation of state (EOS) is determined for the high-pressure orthorhombic phase of boron, B(28), experimentally as well as from ab initio calculations. The unique feature of our experiment is that it is carried out on the single crystal of B(28). In theory, we take into consideration the lattice vibrations, often neglected in first-principles simulations. We show that the phonon contribution has a profound effect on the EOS of B(28), giving rise to anomalously low values of the pressure derivative of the bulk modulus and greatly improving the agreement between theory and experiment.Original Publication:Eyvas Isaev, Sergey Simak, Arkady Mikhaylushkin, Yu. Kh. Vekilov, E. Yu. Zarechnaya, L. Dubrovinsky, N. Dubrovinskaia, M. Merlini, M. Hanfland and Igor Abrikosov, Impact of lattice vibrations on equation of state of the hardest boron phase, 2011, Physical Review B. Condensed Matter and Materials Physics, (83), 13, 132106.http://dx.doi.org/10.1103/PhysRevB.83.132106Copyright: American Physical Societyhttp://www.aps.org
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
Collection of scRNA-Seq datasets with clonal information
No full text<p>Collection of scRNA-Seq datasets with lineage tracing information at the clonal level. They're prepared for the Python package <code>scLiTr</code> (<a href="https://github.com/kharchenkolab/scLiTr" target="_blank" rel="noopener">GitHub</a>).</p>
<p><strong>Available datasets</strong>:</p>
<ol>
<li><em>In vitro</em> hematopoiesis from <a href="https://doi.org/10.1126/science.aaw3381" target="_blank" rel="noopener">Weinreb et al., 2020</a> (<strong>Weinreb_in_vitro.h5ad</strong>).</li>
</ol>
<p>If you want to add some of your datasets here (so they might be easily downloaded via scLiTr interface), please feel free to text me at <code>sergey.isaev[at]meduniwien.ac.at</code>.</p>
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
Standard and Modified SST Models with the Consideration of the Streamline Curvature for Separated Flow Calculation in a Narrow Channel with a Conical Dimple on the Heated Wall
No full textThe testing of the standard and modified SST models of the transfer of shear stresses was carried out on an example of calculating the heat transfer with an intense detached flow around a conical dimple with a slope angle of 45° on the heated wall of a narrow channel. It was shown that the standard turbulence model by Menter SST (MSST) of 2003, widely used in the packages Fluent, CFX, StarCCM+, etc., significantly underestimated the intensity of the return flow. A correction of this model was presented that took into account the influence of the curvature of streamlines within the framework of the Rodi-Leshziner-Isaev (RLI) approach for spatial separated flows. It was found that the predictions for the RLI MSST 2003 were close to the predictions for the original standard MSST 1993, in which the eddy viscosity was calculated using the vorticity modulus. At the same time, the predictions based on the modified one, following Smirnov-Menter (SM) MSST 2003, included in the ANSYS model catalog did not differ too much from the standard MSST 2003. The preference of the MSST modified within the RLI 2003 for calculating the heat transfer in intense separated flows was substantiated
Numerical Simulation of a Periodic Quasi-Switching Mode of Flow around a Conical Dimple with a Slope Angle of 10 Degrees on the Wall of a Narrow Channel Using URANS
No full textThe applicability of the solution of the unsteady Reynolds-averaged Navier–Stokes equations (URANS) for the numerical simulation of the periodic quasi-switching regime of vortex generation and heat transfer in a deep conical dimple with a slope angle of 10∘ on the wall of a narrow channel is substantiated. To calculate the turbulent regime, the model of shear stress transfer by Menter 2003, modified taking into account the influence of the curvature of streamlines within the framework of the Rodi-Leshziner-Isaev approach, is used. At Reynolds number Re=104, the oscillation period of the transverse Rz and longitudinal forces Rx, as well as the total heat transfer Numm to the control section of the heated channel wall with a dimple, is set equal to 60, which corresponds to the Strouhal number St=0.0167. Computer visualization of swirling jet-vortex flows demonstrates focus-type sources on the side faces of the dimple. In the self-oscillating mode, a two-cell vortex system is formed with different intensities at the oscillation period Rz. Periodic changes in friction, Nusselt numbers and temperature are recorded in the longitudinal and transverse median sections of the dimple and reflect the oscillations of the vortex structure from left to right and from right to left. The formation of a fan jet is shown, which oscillates relative to the plane of longitudinal symmetry, causing a redistribution of power and thermal loads
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
Adding Noise During Training as a Method to Increase Resilience of Neural Network Solution of Inverse Problems: Test on the Data of Magnetotelluric Sounding Problem
No full textGroup Determination of Parameters and Training with Noise Addition: Joint Application to Improve the Resilience of the Neural Network Solution of a Model Inverse Problem to Noise in Data
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