cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Nematic liquid crystals in electric and magnetic fields
Creators: name: Frisken, Barbara Joan
Publisher: name: University of British Columbia
Year: 2010

description: External electric and magnetic fields affect the orientation of liquid crystal molecules. Several aspects of these effects have been studied in the liquid crystal 4-n-pentyl-4'-cyanobiphenyl (5CB) with special attention focused on geometries where one field is applied along the direction of initial orientation and a second field is applied perpendicular to this direction to break the uniaxial symmetry of the sample. Preliminary studies involved measuring the magnetic susceptibility of a nematic liquid crystal; for the first time, these measurements were made with a SQUID magnetometer. Details of the nematic ordering in 5CB over the temperature range of 15-40°C and in a magnetic field of 0.060T have been deduced from these measurements. The influence of fields on molecular ordering has been studied theoretically by extending Maier Saupe mean field theory to include two fields. The influence of fields on fluctuations of the nematic director has been studied using continuum theory. These studies show that the effect of fields on fluctuations of the nematic director should dominate the experimental observations. . Optical measurements are reported which demonstrate for the first time that a biaxial nematic phase can be induced by applying two fields to a sample with positive susceptibility anisotropics. This biaxial phase was studied in 5CB at 33.4°C for magnetic fields between .08-.42T and electric fields between 0-6x10⁴V/m. The results agree with those predicted from fluctuation theory. As the magnitude of the symmetry breaking field is increased, a transition to an elastically deformed state takes place; this Freedericksz transition is usually second order. Theory and measurements are reported here which show for the first time that this transition can be first order in a number of geometries for the liquid crystal 5CB. In conjunction with these measurements, a novel modulated phase has been, observed. This appears to be a stable, equilibrium phase in which the director remains in the plane defined by the initial alignment and the distorting field. Experimental investigations, of this phase are presented and a simple model is proposed which predicts this behavior.
‚Ein spruch von einer geisterin‘ von Rosenplüt, vier Priamel und ‚Ein antwúrt vmb einen ters‘
Creators: name: Gerhardt, Christoph
Publisher: name: Trier University
Year: 2021

description: Edition und Untersuchung von sechs bislang unbekannten deutschen Reimpaartexten (ein Märe, vier Priamel, ein Rätsel) aus einer Handschrift des 15. Jahrhunderts.
The power of choice in network growth
Creators: name: D'Souza, Raissa M.
name: Krapivsky, Paul L.
name: Moore, Cristopher
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The "power of choice" has been shown to radically alter the behavior of a number of randomized algorithms. Here we explore the effects of choice on models of tree and network growth. In our models each new node has k randomly chosen contacts, where k > 1 is a constant. It then attaches to whichever one of these contacts is most desirable in some sense, such as its distance from the root or its degree. Even when the new node has just two choices, i.e., when k=2, the resulting network can be very different from a random graph or tree. For instance, if the new node attaches to the contact which is closest to the root of the tree, the distribution of depths changes from Poisson to a traveling wave solution. If the new node attaches to the contact with the smallest degree, the degree distribution is closer to uniform than in a random graph, so that with high probability there are no nodes in the network with degree greater than O(log log N). Finally, if the new node attaches to the contact with the largest degree, we find that the degree distribution is a power law with exponent -1 up to degrees roughly equal to k, with an exponential cutoff beyond that; thus, in this case, we need k >> 1 to see a power law over a wide range of degrees.
description: 9 pages, 4 figures
Decoherence of a particle in a ring
Creators: name: Cohen, Doron
name: Horovitz, Baruch
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider a particle coupled to a dissipative environment and derive a perturbative formula for the dephasing rate based on the purity of the reduced probability matrix. We apply this formula to the problem of a particle on a ring, that interacts with a dirty metal environment. At low but finite temperatures we find a dephasing rate $\propto T^{3/2}$, and identify dephasing lengths for large and for small rings. These findings shed light on recent Monte Carlo data regarding the effective mass of the particle. At zero temperature we find that spatial fluctuations suppress the possibility of having a power law decay of coherence.
description: 5 pages, 1 figure, proofed version to be published in EPL
ปัจจัยที่มีอิทธิพลต่อความรับผิดชอบต่อสังคม (CSR) ของผู้ประกอบการธุรกิจขนาดกลางและขนาดย่อม (SMEs) ในอำเภอเมือง จังหวัดสงขลา
Creators: name: นิพนธ์ สุขสบาย
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2557
Subjects: ความรับผิดชอบต่อสังคมธุรกิจขนาดกลางและขนาดย่อม

description: 6, 33, วารสารมนุษยศาสตร์และสังคมศาสตร์  มหาวิทยาลัยมหาสารคาม
ВОСПОМИНАНИЕ
Creators: name: АДОРНО ТЕОДОР
Publisher: name: Искусство музыки: теория и история
Year: 2018

description: Комментированный перевод главы из монографии выдающегося немецкого философа, социолога и музыковеда Теодора Адорно (1903–1969), некоторое время бывшего учеником Берга по ком-позиции. Один из наиболее умных и тонких знатоков творчества учителя, Адорно стал автором многочисленных статей о его творчестве, впоследствии объединенных в книгу «Берг. Мастер незаметного перехода». В основу «Воспоминания» положен некролог, написанный Адорно в 1935 году, и завершенные 20 лет спустя мемуары. Перевод с немецкого и примечания Ю.С. Векслер. На русском языке публикуется впервые.
ภัยคุกคามในการใช้อินเทอร์เน็ตที่แฝงมากับรูปแบบของโปรแกรมไลน์
Creators: name: กานต์กมล มุ่งมาไพรี
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2557
Subjects: ภัยคุกคาม, การใช้อินเตอร์เน็ต, โปรแกรมไลน์

description: 6, 33, วารสารมนุษยศาสตร์และสังคมศาสตร์  มหาวิทยาลัยมหาสารคาม
Tracking granules at the Sun's surface and reconstructing velocity fields. II. Error analysis
Creators: name: Tkaczuk, R.
name: Rieutord, M.
name: Meunier, N.
name: Roudier, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The determination of horizontal velocity fields at the solar surface is crucial to understanding the dynamics and magnetism of the convection zone of the sun. These measurements can be done by tracking granules. Tracking granules from ground-based observations, however, suffers from the Earth's atmospheric turbulence, which induces image distortion. The focus of this paper is to evaluate the influence of this noise on the maps of velocity fields. We use the coherent structure tracking algorithm developed recently and apply it to two independent series of images that contain the same solar signal. We first show that a k-ωfiltering of the times series of images is highly recommended as a pre-processing to decrease the noise, while, in contrast, using destretching should be avoided. We also demonstrate that the lifetime of granules has a strong influence on the error bars of velocities and that a threshold on the lifetime should be imposed to minimize errors. Finally, although solar flow patterns are easily recognizable and image quality is very good, it turns out that a time sampling of two images every 21 s is not frequent enough, since image distortion still pollutes velocity fields at a 30% level on the 2500 km scale, i.e. the scale on which granules start to behave like passive scalars. The coherent structure tracking algorithm is a useful tool for noise control on the measurement of surface horizontal solar velocity fields when at least two independent series are available.
description: in press in Astronomy and Astrophysics, 9 pages
Constraining scalar-tensor theories by neutron star-balck hole gravitational wave events
Creators: name: Niu, Rui
name: Zhang, Xing
name: Wang, Bo
name: Zhao, Wen
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: With the continuous upgrade of detectors, more and more gravitational wave (GW) events were captured by the LIGO Scientific Collaboration and Virgo Collaboration (LVC), which offers a new avenue to test General Relativity and explore the nature of gravity. Although, various model-independent tests have been performed by LVC in previous works, it is still interesting to ask what constraints on specific models can be placed by current GW observations. In this work, we focus on three models of scalar-tensor theories, the Brans-Dicke theory (BD), the theory with scalarization phenomena proposed by Damour and Esposito-Farèse (DEF), and Screened Modified Gravity (SMG). From all 4 possible NSBH events so far, we use two of them to place the constraints. The other two are excluded in this work due to the possible unphysical deviations. We consider the inspiral range with the cutoff frequency at the innermost stable circular orbit and add a modification of dipole radiation into the waveform template. The scalar charges of neutron stars in the dipole term are derived by solving the Tolman-Oppenheimer-Volkoff equations for different equations-of-states. The constraints are obtained by performing the full Bayesian inference with the help of the open source software \texttt{Bilby}. The results show that the constraints given by GWs are comparable with those given by pulsar timing experiments for DEF theory, but are not competitive with the current solar system constraints for BD and SMG theories.
description: 27 pages, 14 figures; posterior data available at https://doi.org/10.5281/zenodo.5188445; including the two recently released NSBH events; accepted for publication in ApJ
Terahertz Time-Domain Magnetospectroscopy of a High-Mobility Two-Dimensional Electron Gas
Creators: name: Wang, X.
name: Hilton, D. J.
name: Ren, L.
name: Mittleman, D. M.
name: Kono, J.
name: Reno, J. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have observed cyclotron resonance in a high-mobility GaAs/AlGaAs two-dimensional electron gas by using the techniques of terahertz time-domain spectroscopy combined with magnetic fields. From this, we calculate the real and imaginary parts of the diagonal elements of the magnetoconductivity tensor, which in turn allows us to extract the concentration, effective mass, and scattering time of the electrons in the sample. We demonstrate the utility of ultrafast terahertz spectroscopy, which can recover the true linewidth of cyclotron resonance in a high-mobility ($>{10}^{6} \mathrm{cm^{2} V^{-1} s^{-1}}$) sample without being affected by the saturation effect.
description: 4 pages, 3 figures
การพัฒนาในเขตกัมพูชาตะวันตกภายใต้กรอบยุทธศาสตร์จัตุโกณ
Creators: name: อำพา แก้วกำกง
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2557
Subjects: การพัฒนาเศรษฐกิจและสังคม, กัมพูชาตะวันตก, ยุทธศาสตร์จตุโกณ

description: 6, 33, วารสารมนุษยศาสตร์และสังคมศาสตร์  มหาวิทยาลัยมหาสารคาม
Holonomy in quantum physics
Creators: name: Rutherford, Alexander R.
Publisher: name: University of British Columbia
Year: 2010

description: Holonomy in nonrelativistic quantum mechanics is examined in the context of the adiabatic theorem. This theorem is proven for sufficiently regular unbounded hamiltoni-ans. Then, simplifying to matrix hamiltonians, it is proven that the adiabatic theorem defines a connection on vector bundles constructed out of eigenspaces of the hamiltonian. Similar degeneracy regions, the natural base spaces for these bundles, are defined in terms of stratifications for the spaces of complex, hermitian matrices and real, symmetric matrices. The algebraic topology of similar degeneracy regions is studied in detail, and the results are used to classify and calculate all possible adiabatic phases for time-reversal invariant matrix hamiltonians in terms of the relevant topological data. It is shown how vector bundles may be used to impose transversality on the helicity vector of a photon. This is used to give a calculation, which is consistent with transversality, of quantum adiabatic phase for photons in a coiled optical fibre. As an additional application, the importance of quantum adiabatic in the dynamical Jahn-Teller effect is briefly explained. An introduction is given to some important aspects of algebraic topology, which are used herein. Moreover, a number of mathematical results for flag manifolds are obtained. These results are applied to quantum adiabatic holonomy.
Correlation functions of the open XXZ chain I
Creators: name: Kitanine, N.
name: Kozlowski, K. K.
name: Maillet, J. M.
name: Niccoli, G.
name: Slavnov, N. A.
name: Terras, V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the XXZ spin chain with diagonal boundary conditions in the framework of algebraic Bethe Ansatz. Using the explicit computation of the scalar products of Bethe states and a revisited version of the bulk inverse problem, we calculate the elementary building blocks for the correlation functions. In the limit of half-infinite chain, they are obtained as multiple integrals of usual functions, similar to the case of periodic boundary conditions.
description: 44 pages
МЕЖДУ РОССИЕЙ И ФРАНЦИЕЙ: НАУЧНЫЙ ПУТЬ НИНЫ НИКОЛАЕВНЫ КАЛИТИНОЙ
Creators: name: КЛЮШИНА ЕЛЕНА ВИТАЛЬЕВНА
name: СОКОЛОВ РОМАН АЛЕКСАНДРОВИЧ
Publisher: name: Искусствознание
Year: 2019
Subjects: НИНА КАЛИТИНА
МИХАИЛ КАРГЕР
НИКОЛАЙ ПУНИН
ИЕРЕМИЯ ИОФФЕ
АНДРЕ ШАСТЕЛЬ
ПЬЕР ФРАНКАСТЕЛЬ
ЖАН АДЕМАР
МЕТОДОЛОГИЯ ИСТОРИИ ИСКУССТВА
ИСТОРИЧЕСКИЙ ФАКУЛЬТЕТ СПБГУ
NINA KALITINA
MIKHAIL KARGER
NIKOLAI PUNIN
LEREMIJA IOFFE
METHODOLOGY OF ART HISTORY
INSTITUTE OF HISTORY
HISTORY FACULTY AT ST. PETERSBURG UNIVERSITY

description: Изучение искусства Франции российской искусствоведческой наукой второй половины XX начале XXI века основывалось на французской и отечественной исследовательских традициях, которые прослеживаются на нескольких уровнях: практическом, образовательном и, что особенно важно, научно-методологическом. Зримым воплощением этого стала научная карьера доктора искусствоведения, почетного профессора СПбГУ Нины Николаевны Калитиной (1926-2018). Однако желание перенять передовой опыт зарубежной науки всегда сочеталось у Калитиной со стремлением соединить его с традициями и новыми тенденциями развития отечественной гуманитарной мысли, что придавало уникальный характер ее трудам, находившим заинтересованного читателя в России и за границей.
คุณภาพของนํ้าดื่มบรรจุขวด นํ้าดื่มบรรจุถ้วย และนํ้าดื่มจากตู้นํ้าดื่มหยอดเหรียญที่จำหน่าย ในจังหวัดชลบุรี ประเทศไทย
Creators: name: สุบัณฑิต นิ่มรัตน์
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2557
Subjects: น้ำดื่มบรรจุขวดล, น้ำดื่มบรรจุถ้วย, ตู้น้ำดื่มหยอดเหรียญ, แบคทีเรียโคลิฟอร์ม, ฟีคัลโคลิฟอร์ม, E. coli, จังหวัดชลบุรี, ประเทศไทย

description: 6, 33, วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยมหาสารคาม
СПИСОК ОПУБЛИКОВАННЫХ РАБОТ
Creators: name: КАЛИТИНА НИНА НИКОЛАЕВНА
Publisher: name: Искусствознание
Year: 2019
Subjects: НИНА КАЛИТИНА
ФРАНЦУЗСКОЕ ИСКУССТВО XIX ВЕКА
ПОЛИТИЧЕСКАЯ КАРИКАТУРА
ГРАФИКА
ПЕЙЗАЖ
ПОРТРЕТ
СКУЛЬПТУРА
ДОМЬЕ
КУРБЕ
NINA KALITINA
FRENCH 19TH CENTURY ART
POLITICAL CARICATURE
GRAPHICS
LANDSCAPE
PORTRAIT
SCULPTURE
DAUMIER
COURBET

description: Публикуемый список трудов Нины Николаевны Калитиной составлен на основе перечня научных работ, первично сформированного Татьяной Сохор и впервые опубликованного в сборнике научных статей «Перекресток искусств Россия Запад», выпущенном к юбилею Нины Николаевны в 2016 году1. Сохраняя неизбывный интерес к профессии на протяжении всей жизни, в последние два года Калитина пополнила и без того значительный список несколькими научными статьями. В настоящем издании приводится уточненный и дополненный перечень.
Ratio Asymptotic of Hermite-Padé Orthogonal Polynomials for Nikishin Systems. II
Creators: name: García, Abey López
name: Lagomasino, Guillermo López
Publisher: name: arXiv
Year: 2007
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 42C05, 30E10 (Primary), 41A21 (Secondary)

description: We prove ratio asymptotic for sequences of multiple orthogonal polynomials with respect to a Nikishin system of measures ${\mathcal{N}}(σ_1,...,σ_m)$ such that for each $k$, the support of $σ_k$ consists of an interval $\widetildeΔ_k$, on which $σ_k^{\prime} > 0$ almost everywhere, and a set without accumulation points in $\mathbb{R} \setminus \widetildeΔ_k$.
description: 24 pages, 2 tables
Evolution favors protein mutational robustness in sufficiently large populations
Creators: name: Bloom, Jesse D.
name: Lu, Zhongyi
name: Chen, David
name: Raval, Alpan
name: Venturelli, Ophelia S.
name: Arnold, Frances H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences

description: BACKGROUND: An important question is whether evolution favors properties such as mutational robustness or evolvability that do not directly benefit any individual, but can influence the course of future evolution. Functionally similar proteins can differ substantially in their robustness to mutations and capacity to evolve new functions, but it has remained unclear whether any of these differences might be due to evolutionary selection for these properties. RESULTS: Here we use laboratory experiments to demonstrate that evolution favors protein mutational robustness if the evolving population is sufficiently large. We neutrally evolve cytochrome P450 proteins under identical selection pressures and mutation rates in populations of different sizes, and show that proteins from the larger and thus more polymorphic population tend towards higher mutational robustness. Proteins from the larger population also evolve greater stability, a biophysical property that is known to enhance both mutational robustness and evolvability. The excess mutational robustness and stability is well described by existing mathematical theories, and can be quantitatively related to the way that the proteins occupy their neutral network. CONCLUSIONS: Our work is the first experimental demonstration of the general tendency of evolution to favor mutational robustness and protein stability in highly polymorphic populations. We suggest that this phenomenon may contribute to the mutational robustness and evolvability of viruses and bacteria that exist in large populations.
Kinetic screening in nonlinear stellar oscillations and gravitational collapse
Creators: name: Bezares, Miguel
name: ter Haar, Lotte
name: Crisostomi, Marco
name: Barausse, Enrico
name: Palenzuela, Carlos
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider k-essence, a scalar-tensor theory with first-order derivative self-interactions that can screen local scales from scalar fifth forces, while allowing for sizeable deviations from General Relativity on cosmological scales. We construct fully nonlinear static stellar solutions that show the presence of this screening mechanism, and we use them as initial data for simulations of stellar oscillations and gravitational collapse in spherical symmetry. We find that for k-essence theories of relevance for cosmology, the screening mechanism works in the case of stellar oscillation and suppresses the monopole scalar emission to undetectable levels. In collapsing stars, we find that the Cauchy problem, although locally well posed, can lead to diverging characteristic speeds for the scalar field. By introducing a ''fixing equation'' in the spirit of J. Cayuso, N. Ortiz, and L. Lehner [Phys. Rev. D 96, 084043 (2017)], inspired in turn by dissipative relativistic hydrodynamics, we manage to evolve collapsing neutron stars past the divergence of the characteristic speeds. We show that, in these systems, the screening mechanism is less efficient than for oscillating and static stars, because the collapsing star must shed away all of its scalar hair before forming a black hole. For k-essence theories of relevance for cosmology, the characteristic frequency of the resulting scalar monopole signal is too low for terrestrial detectors, but we conjecture that space-borne interferometers such as LISA might detect it if a supernova explodes in the Galaxy.
description: 17 pages, 11 figures. Minor changes, matches version published in PRD
Multiplicative Functions on Shifted Primes
Creators: name: Sachpazis, Stelios
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11N37, 11N64

description: Let $f$ be a positive multiplicative function and let $k\geq 2$ be an integer. We prove that if the prime values $f(p)$ converge to $1$ sufficiently slowly as $p\rightarrow +\infty$, in the sense that $\sum_{p}|f(p)-1|=\infty$, there exists a real number $c>0$ such that the $k$-tuples $(f(p+1),\ldots,f(p+k))$ are dense in the hypercube $[0,c]^k$ or in $[c,+\infty)^k$. In particular, the values $f(p+1),\ldots,f(p+k)$ can be put in any increasing order infinitely often. Our work generalises previous results of De Koninck and Luca.
description: 11 pages; Corrected a few typos of the previous version
Numerical hardware-efficient variational quantum simulation of a soliton solution
Creators: name: Kardashin, Andrey
name: Pervishko, Anastasiia
name: Biamonte, Jacob
name: Yudin, Dmitry
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Implementing variational quantum algorithms with noisy intermediate-scale quantum machines of up to a hundred qubits is nowadays considered as one of the most promising routes towards achieving a quantum practical advantage. In multiqubit circuits, running advanced quantum algorithms is hampered by the noise inherent to quantum gates which distances us from the idea of universal quantum computing. Based on a one-dimensional quantum spin chain with competing symmetric and asymmetric pairwise exchange interactions, herein we discuss the capabilities of quantum algorithms with special attention paid to a hardware-efficient variational eigensolver. A delicate interplay between magnetic interactions allows one to stabilize a chiral state that destroys the homogeneity of magnetic ordering, thus making this solution highly entangled. Quantifying entanglement in terms of quantum concurrence, we argue that, while being capable of correctly reproducing a uniform magnetic configuration, the hardware-efficient ansatz meets difficulties in providing a detailed description to a noncollinear magnetic structure. The latter naturally limits the application range of variational quantum computing to solve quantum simulation tasks.
description: 6 pages, 4 figures, Supplemental Material
Low energy constants of \chiPT from the instanton vacuum model
Creators: name: Goeke, K.
name: Musakhanov, M. M.
name: Siddikov, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the framework of the instanton vacuum model we make expansion over the current mass m and number of colors N_c and evaluate ${\cal O}(1/N_c, m, m/N_c, m \ln m/N_c)$-corrections to the dynamical quark mass M, the quark condensate $$, the pion mass M_πand decay constant F_π. There are several sources of these corrections: meson loops, finite size of the instanton distribution and the quark-quark "tensor" interaction terms. In contrast to the expectations, we found that numerically the 1/N_c-corrections to dynamical mass are large and mostly come from meson loops. As a consequence, we have large 1/N_c-corrections to all the other quantities. To provide the values of $F_π(m=0), \ave{\bar qq(m=0)}$ in agreement with \chiPT, we offer a new set of parameters ρ, R. Finally, we find the low-energy SU(2)_f chiral lagrangian constants $\bar l_3, \bar l_4$ in a rather good correspondence with the phenomenology.
Accelerating Universe in Higher Dimensional Space Time : an alternative approach
Creators: name: Panigrahi, D.
name: Paul, B. C.
name: Chatterjee, S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We have discussed here a higher dimensional cosmological model and explained the recent acceleration with a Chaplygin type of gas. Dimensional reduction of extra space is possible in this case. Our solutions are general in nature because all the well known results of 4D Chaplygin driven cosmology are recovered when $d = 0$. We have drawn the best fit graph using the data obtained by the differential age method (CC) and it is seen that the graph favours only one extra dimension. That means the Chaplygin gas is apparently dominated by a 5D world. Relevant to point out that the final equation in this case are highly nonlinear in nature. Naturally it is not possible to obtain explicit solution of the 4D scale factor with time. To circumvent this difficulty, we consider a first order approximation of the key equation which has made it possible to get time explicit solution of 4D scale factor in exact form as well as the expression of extra dimensions. It may be pointed out that for large four dimensional scale factor this solution mimics $Λ$CDM model. An analysis of flip time is also studied both analytically and graphically in some detail. It clearly shows that early \emph{flip} occurs for higher dimensions. It is also seen that the rate of dimensional reduction is faster for higher dimensions. So we may conclude that the effect of compactification of extra dimension helps the acceleration.
description: 14 Pages, 11 figures
On the origin of switchbacks observed in the solar wind
Creators: name: Mozer, Forrest S.
name: Bale, Stuart
name: Bonnell, John
name: Drake, James
name: Hanson, Elizabeth
name: Mozer, Michael C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: The origin of switchbacks in the solar wind is discussed in two classes of theory that differ in the location of the source being either in the transition region near the Sun or in the solar wind, itself. The two classes of theory differ in their predictions of the switchback rate as a function of distance from the Sun. To test these theories, one-hour averages of Parker Solar Probe data were summed over orbits three through seven. It is found that: 1. The average switchback rate was independent of distance from the Sun. 2. The average switchback rate increased with solar wind speed. 3. The switchback size perpendicular to the flow increased as R, the distance from the Sun, while the radial size increased as R2, resulting in a large and increasing switchback aspect ratio with distance from the Sun. 4. The switchback rotation angle did not depend on either the solar wind speed or the distance from the Sun. These results are consistent with switchback formation in the transition region because their increase of tangential size with radius compensates for the radial falloff of their equatorial density to produce switchback rates that are independent of distance from the Sun. This constant observed switchback rate is inconsistent with an in situ source. Once formed, the switchback size and aspect ratio, but not the rotation angle, increased with radial distance to at least 100 solar radii. In addition, quiet intervals between switchback patches occurred at the lowest solar wind speeds.
description: 10 figures and an appendix with four more figures
Ringdown of Charged Compact Objects using Membrane Paradigm
Creators: name: Rahman, Mostafizur
name: Bhattacharyya, Arpan
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Although the black holes are an integral part of the standard model of astrophysics and cosmology, their existence poses some serious fundamental problems. In recent years, several horizonless compact object models were proposed to address those issues. As the gravitational wave detectors started to observe more and more merger events with a large signal-to-noise ratio, gravitational wave spectroscopy could hold the key to uncover the existence of these objects. This is because the late time ringdown signals of horizonless compact objects differ from that of the black holes. In this paper, we study the ringdown properties of charged compact objects and compare them with those obtained in the black hole scenario. Since the internal structure and the equation of state of these compact objects are largely unknown, we employ membrane paradigm to obtain appropriate boundary conditions for the perturbations of these objects. This model can describe the ringdown properties of a large variety of compact objects.
description: 18 pages, 7 Figures, two new sections added, minor improvements; Accepted for publication in PRD
ЧТО ПОЗВОЛЯЕТ СТИЛИСТИЧЕСКИЙ АНАЛИЗ?
Creators: name: ЛИФШИЦ ЛЕВ
Publisher: name: Искусствознание
Year: 2019
Subjects: ИКОНОПИСЬ
СТИЛЬ
ДАТИРОВКИ
ТЕХНИКА
ТЕХНОЛОГИЯ
КОЛОРИТ
КОМПОЗИЦИЯ

description: Статья посвящена рассмотрению особенностей художественного анализа памятников византийской и древнерусской иконописи. На примере имеющихся противоречий в датировках икон конца XIV - первой трети XV века разбираются типовые ошибки, допускаемые исследователями.
ФЛОРЕНСКИЙ И ОБРАТНАЯ ПЕРСПЕКТИВА. ИЗ ИСТОРИИ ТЕРМИНА
Creators: name: ТАРАСОВ ОЛЕГ
Publisher: name: Искусствознание
Year: 2019
Subjects: ОБРАТНАЯ И ЛИНЕЙНАЯ ПЕРСПЕКТИВА
МЕТАФИЗИКА ГРАНИЦЫ
МНОЖЕСТВЕННОСТЬ ТОЧЕК ЗРЕНИЯ
СТРОЕНИЕ ХУДОЖЕСТВЕННОГО ПРОСТРАНСТВА
КУЛЬТУРОЛОГИЯ ИКОНЫ

description: Статья посвящена истории открытия П. А. Флоренским обратной перспективы как особой художественной системы визуального образа. Повышенное внимание уделяется истории термина «обратная перспектива» в контексте новых эстетических теорий начала XX века. Трактовка обратной перспективы показана неотделенной от символической философии Флоренского и его метафизики иконы. Важнейшее значение имело также развитие им современной математической теории и святоотеческой богословской традиции.
Elemental Abundances and Ages of $z\sim0.7$ Quiescent Galaxies on the Mass-Size Plane: Implication for Chemical Enrichment and Star-Formation Quenching
Creators: name: Beverage, Aliza G.
name: Kriek, Mariska
name: Conroy, Charlie
name: Bezanson, Rachel
name: Franx, Marijn
name: van der Wel, Arjen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present elemental abundances and stellar population ages for 68 massive quiescent galaxies at $0.59\leq z\leq0.75$ from the LEGA-C survey. The abundance patterns and ages, derived from full-spectrum modeling, are examined as a function of stellar mass ($M_*$) and size (i.e., half-light radius; $R_e$). We find that both [Mg/H] and [Fe/H] do not vary with stellar mass but are correlated with $M_*/R_e$ for quiescent galaxies with $M_*>10^{10.5} M_\odot$. Thus, at fixed mass, compact quiescent galaxies are on average more metal rich. This result reinforces the picture that supernova feedback and gravitational potential regulate chemical enrichment. [Mg/Fe] does not vary with $M_*$ or $M_*/R_e$, but there is a marginal positive relation between age and mass. Our results support low-redshift findings that more massive galaxies form their stars at earlier times. However, in contrast to low-redshift studies, star formation timescale does not appear to depend on mass or size. We also compare the mass-[Fe/H] and mass-[Mg/H] relations to stacks of quiescent galaxies at $z\sim0$ and find that both relations increase by $\sim0.2$ dex over the past 7 Gyr. Furthermore, at $z\sim0.7$ we find a clear trend with age, such that older quiescent galaxies have lower metallicities. Both results can be explained by a chemical evolution model in which galaxies quench via gas removal. Future work, in particular with JWST/NIRSpec, will extend this analysis to higher redshifts, allowing us to fully exploit abundance patterns to study the formation histories of quiescent galaxies.
О ДВУХ СЮЖЕТАХ ДЕКОРА ДРЕВНЕРУССКИХ СЕРЕБРЯНЫХ БРАСЛЕТОВ КОСТЮМ
Creators: name: ЛИФШИЦ ЛЕВ
Publisher: name: Искусствознание
Year: 2019
Subjects: БРАСЛЕТ
РУСАЛИИ
ПРИТЧА
ПАРОДИЯ
ЗАГАДКА
СВАДЕБНЫЙ ПИР
БАСНЯ

description: В статье критически рассматриваются существующие интерпретации некоторых мотивов декора серебряных браслетов домонгольского времени, в которых стало уже традицией видеть отражение языческой обрядности, связанной с русальными празднованиями. По мнению автора, их текстовая основа имеет принципиально иной характер - приточно-сказовый, а истоки восходят к традициям античной литературы.
Searching for interstellar quantum communications
Creators: name: Hippke, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The modern search for extraterrestrial intelligence (SETI) began with the seminal publications of Cocconi & Morrison (1959) and Schwartz & Townes (1961), who proposed to search for narrow-band signals in the radio spectrum, and for optical laser pulses. Over the last six decades, more than one hundred dedicated search programs have targeted these wavelengths; all with null results. All of these campaigns searched for classical communications, that is, for a significant number of photons above a noise threshold; with the assumption of a pattern encoded in time and/or frequency space. I argue that future searches should also target quantum communications. They are preferred over classical communications with regards to security and information efficiency, and they would have escaped detection in all previous searches. The measurement of Fock state photons or squeezed light would indicate the artificiality of a signal. I show that quantum coherence is feasible over interstellar distances, and explain for the first time how astronomers can search for quantum transmissions sent by ETI to Earth, using commercially available telescopes and receiver equipment.
description: Added references
«ЧУДО РОСКОШИ, БЛЕСКА И ВЕЛИКОЛЕПИЯ». РОССИЙСКАЯ МОДА 1860-1870-Х ГОДОВ
Creators: name: КИРСАНОВА РАИСА
Publisher: name: Искусствознание
Year: 2019
Subjects: ИСТОРИЯ МОДЫ
ПАРЧА
БУРНУС
ГАГАТ
БОМБАЗИН
АЛЬПАГА
КРЕП
ШИНЕЛЬ
ПЛАЩ-ПАЛЬТО
КРИНОЛИН
ТУРНЮР
ВИЗИТКА
ЖАКЕТ

description: В период между 1860-ми и 1870-ми годами правительственные указы и политические изменения в России привели к серьезным изменениям в моде. И это не только отмена крепостного права, что расширило сферу применения женского труда, но и отказ от «николаевской шинели» с воцарением Александра II и появлением плаща-пальто в качестве военной формы (1855), а значит, изменений в мужской одежде. Общество сильно расслоилось - исчезла строгая ориентация на придворные круги. Именно поэтому титулованное и столбовое дворянство начало сознательно отставать от моды, демонстрируя безупречный вкус, а не богатство. Отмену студенческой формы в 1861 году только формально можно считать демократическим завоеванием, потому что студенты были вынуждены ходить на лекции по очереди, кооперируясь с соседями по наемному жилью, что отражено в мемуарных свидетельствах современников.
В. В. СТАСОВ И А. В. ПРАХОВ: «СТРАННОЕ КОМБИНИРОВАНИЕ» 1870-Х ГОДОВ И АБРАМЦЕВСКИЙ КРУЖОК
Creators: name: ПАСТОН ЭЛЕОНОРА
Publisher: name: Искусствознание
Year: 2019
Subjects: ХУДОЖЕСТВЕННАЯ КРИТИКА
РЕАЛИЗМ
РОМАНТИЗМ
НЕОРОМАНТИЧЕСКИЕ ИСКАНИЯ
АБРАМЦЕВСКИЙ КРУЖОК

description: В статье рассматриваются проблемы художественно-критической деятельности В. В. Стасова и А. В. Прахова, явившейся своеобразным отражением русской художественной культуры 1870-х годов, в которой среди материалистических и позитивистских идей и настроений возникают неоромантические тенденции. Наиболее ярко они проявились в деятельности Абрамцевского кружка, на формирование эстетической направленности которого большое влияние оказали эстетические постулаты эпохи романтизма, исповедуемые Адрианом Праховым и его старшим братом Мстиславом, принимавшими участие в различных художественных предприятиях содружества в начале его деятельности. В статье утверждается мысль о связи эстетических установок эпохи романтизма через жизнестроительные идеи и художественную практику Абрамцевского кружка с неоромантическими исканиями начала XX века.
Gemini NIFS survey of feeding and feedback in nearby Active Galaxies -- IV. Excitation
Creators: name: Riffel, Rogemar A.
name: Bianchin, Marina
name: Riffel, Rogerio
name: Storchi-Bergmann, Thaisa
name: Schonell, Astor J.
name: Dahmer-Hahn, Luis Gabriel
name: Dametto, Natacha Z.
name: Diniz, Marlon R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The near-infrared spectra of Active Galactic Nuclei (AGN) present emission lines of different atomic and molecular species. The mechanisms involved in the origin of these emission lines in AGN are still not fully understood. We use J and K band integral field spectra of six luminous ($43.1
description: 18 pages, accepted for publication in MNRAS
Halo effective field theory analysis of one-neutron knockout reactions of $^{11}\rm Be$ and $^{15}\rm C$
Creators: name: Hebborn, Chloë
name: Capel, Pierre
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Background: One-nucleon knockout reactions provide insightful information on the single-particle structure of nuclei. When applied to one-neutron halo nuclei, they are purely peripheral, suggesting that they could be properly modeled by describing the projectile within a Halo Effective Field Theory (Halo-EFT). Purpose: We reanalyze the one-neutron knockout measurements of $^{11}$Be and $^{15}$C-both one-neutron halo nuclei-on beryllium at about 60MeV/nucleon. We consider Halo-EFT descriptions of these nuclei which already provide excellent agreement with breakup and transfer data. Method: We include a Halo-EFT description of the projectile within an eikonal-based model of the reaction and compare its outcome to existing data. Results: Excellent agreement with experiment is found for both nuclei. The asymptotic normalization coefficients inferred from this comparison confirm predictions from \emph{ab initio} nuclear-structure calculations and values deduced from transfer data. Conclusions: Halo-EFT can be reliably used to analyze one-neutron knockout reactions measured for halo nuclei and test predictions from state-of-the-art nuclear structure models on these experimental data.
description: 7 pages, 1 figures, 2 tables, Accepted in Phys. Rev. C
ИЛЬЯ РЕПИН: «ВЫРАЖАТЬСЯ СВОБОДНО». О НЕКОТОРЫХ ОСОБЕННОСТЯХ ТВОРЧЕСКОГО МЕТОДА И. Е. РЕПИНА
Creators: name: ЮДЕНКОВА ТАТЬЯНА
Publisher: name: Искусствознание
Year: 2019
Subjects: РЕПИН
ТЕМА ЖИЗНИ И СМЕРТИ В ИСКУССТВЕ
СМЫСЛОВАЯ ИНВЕРСИЯ
ИКОНОГРАФИЧЕСКИЕ СХЕМЫ
ЕВАНГЕЛЬСКАЯ ПРОБЛЕМАТИКА В ЖИВОПИСИ

description: Статья посвящена своеобразию творческого метода Репина, позволяющего говорить о цельности его художественной натуры. Ранее было принято рассматривать его творчество, ссылаясь на непоследовательность его взглядов. В статье кратко намечена линия теоретических воззрений художника на искусство как на главнейшую сферу человеческого бытия, над которой стоит Бог. Система ценностной ориентации Репина, в общих чертах сложившаяся в молодые годы, оставалась неизменной: он искал равновесия между смыслами и пластикой образа. Использование смысловых инверсий способствовало углублению образов. Одну из своих задач он видел в опоре на традиции европейского искусства. Евангельская проблематика притягивала его в течение всего творчества. Тема жизни и смерти стала главной в его искусстве.
Giant spin Hall angle in the Heusler alloy Weyl ferromagnet Co$_2$MnGa
Creators: name: Leiva, L.
name: Granville, S.
name: Zhang, Y.
name: Dushenko, S.
name: Shigematsu, E.
name: Shinjo, T.
name: Ohshima, R.
name: Ando, Y.
name: Shiraishi, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Weyl semimetals are playing a major role in condensed matter physics due to exotic topological properties, and their coexistence with ferromagnetism may lead to enhanced spin-related phenomena. Here, the inverse spin Hall effect (ISHE) in the ferromagnetic Weyl-semimetal Heusler alloy Co$_2$MnGa was investigated at room temperature by means of electrical spin injection in lateral spin valve structures. Spin transport properties such as spin polarization and spin diffusion length in this material were precisely extracted in order to estimate the spin Hall angle $θ_{\textrm{SH}}$, which was found to be $-0.19\pm0.04$ and is among the highest reported for a ferromagnet. Although this value is on the same order of magnitude of known heavy metals, the significantly higher resistivity of Co$_2$MnGa implies an improvement on the magnitude of detection voltages, while its ferromagnetic nature allows controlling the intensity of SHE through the magnetization direction. It was also shown that Onsager's reciprocity does not hold for this system, which is in part attributable to a different spin-dependent Hall conductivity for spin-up and spin-down carriers.
description: 14 pages with 13 figures including supplemental materials
ИСТОРИЯ ИЛЛЮСТРИРОВАНИЯ ЖУРНАЛА LA PLUME
Creators: name: КЛЮШИНА ЕЛЕНА
Publisher: name: Искусствознание
Year: 2019
Subjects: LA PLUME
СИМВОЛИЗМ
АФИША
ЖУРНАЛЬНАЯ ГРАФИКА
ИЛЛЮСТРАЦИЯ
ШЕРЕ
МУХА
ГРАССЕ
БОДЛЕР

description: Литературно-художественный журнал La Plume, основанный Леоном Дешамом в 1889 году и просуществовавший вплоть до начала Первой мировой войны, являлся одним из важнейших «малых ревю» Франции эпохи Fin de Siecle. Несмотря на то что он послужил прообразом для его будущих конкурентов (La Revue Blanche, L’Ermitage, Mercure de France) и стал платформой, на базе которой вырабатывались философско-эстетические основы эпохи, степень исследованности La Plume по сей день остается довольно низкой. Оставляя в стороне оценку значения литературной деятельности названного журнала, автор видит свою цель в изучении особенностей художественного иллюстрирования La Plume.
An algebraic generalization of Kripke structures
Creators: name: Marcelino, Sérgio
name: Resende, Pedro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Logic (math.LO)
subject: Logic in Computer Science (cs.LO)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 03B45 (Primary) 03G25, 06F07 (Secondary)

description: The Kripke semantics of classical propositional normal modal logic is made algebraic via an embedding of Kripke structures into the larger class of pointed stably supported quantales. This algebraic semantics subsumes the traditional algebraic semantics based on lattices with unary operators, and it suggests natural interpretations of modal logic, of possible interest in the applications, in structures that arise in geometry and analysis, such as foliated manifolds and operator algebras, via topological groupoids and inverse semigroups. We study completeness properties of the quantale based semantics for the systems K, T, K4, S4, and S5, in particular obtaining an axiomatization for S5 which does not use negation or the modal necessity operator. As additional examples we describe intuitionistic propositional modal logic, the logic of programs PDL, and the ramified temporal logic CTL.
description: 39 pages
Cryogenic hydrogen maser
Creators: name: Hürlimann, Martin Dominik
Publisher: name: University of British Columbia
Year: 2010

description: A new type of atomic hydrogen maser that operates in a dilution refrigerator has been developed. In this device, the hydrogen atoms circulate back and forth between a microwave pumped state invertor in high field and the maser cavity in zero field. A prototype maser with a small maser cavity has been built and the results obtained so far are encouraging. Stable maser oscillations were observed for temperatures of the maser bulb between 230 mK and 660 mK and for densities up to 3 x 1012cm⁻³. The short term frequency stability was measured with the help of two high quality quartz crystal oscillators by the three-cornered-hat method. The observed fractional frequency fluctuations for an averaging time of 1 s were 6.3 ± 3.7 x 10⁻¹⁴, which is lower than the results from the best room temperature masers. In conjunction with the stability measurements, the phase noise of the maser electronics was investigated. In particular, the temperature dependence of the phase noise of the cooled preamplifier was measured and it was shown that anomalous high noise levels between 2.2 K and 4.2 K are caused by the boiling of the liquid helium. From the temperature dependence of the maser frequency, the binding energy E[sub B] of H on ⁴He could be determined to a high precision. The result is E[sub B] = 1.011 ± 0.010 K. An extensive computer simulation program has been written that models the operation of the cryogenic hydrogen maser. It has been used to analyze and interpret some of the data. In addition, this simulation program is helpful for the design of an improved second generation cryogenic maser. Based on the present data and the model calculations, a new pumping scheme is proposed that is expected to increase the efficiency of the state invertor significantly.