cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Terahertz conductivity of the magnetic Weyl semimetal Mn$_{3}$Sn films
Creators: name: Cheng, Bing
name: Wang, Youcheng
name: Barbalas, D.
name: Higo, Tomoya
name: Nakatsuji, S.
name: Armitage, N. P.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Mn$_{3}$Sn is a non-collinear antiferromagnet which displays a large anomalous Hall effect at room temperature. It is believed that the principal contribution to its anomalous Hall conductivity comes from Berry curvature. Moreover, dc transport and photoemission experiments have confirmed that Mn$_{3}$Sn may be an example of a time-reversal symmetry breaking Weyl semimetal. Due to a small, but finite moment in the room temperature inverse triangular spin structure, which allows control of the Hall current with external field, this material has garnered much interest for next generation memory devices and THz spintronics applications. In this work, we report a THz range study of oriented Mn$_{3}$Sn thin films as a function of temperature. At low frequencies we found the optical conductivity can be well described by a single Drude oscillator. The plasma frequency is strongly suppressed in a temperature dependent fashion as one enters the 260 K helical phase. This may be associated with partial gapping of the Fermi surfaces that comes from breaking translational symmetry along the c-axis. The scattering rate shows quadratic temperature dependence below 200 K, highlighting the possible important role of interactions in this compound.
description: 4 pages, 3 figures, Submitted
Paper II
Creators: name: DAILU GUAN
Publisher: name: figshare
Year: 2020
Subjects: subject: 70201 Animal Breeding
subject: FOS: Animal and dairy science

description: The variation in the casein genes has a major impact on the milk composition of goats. Even though many casein polymorphisms have been identified so far, we do not know yet whether they are evolutionarily ancient (i.e., they existed before domestication) or young (i.e., they emerged after domestication). Herewith, we identified casein polymorphisms in a data set of 106 caprine whole-genome sequences corresponding to bezoars (Capra aegagrus, the ancestor of domestic goats) and 4 domestic goat (Capra hircus) populations from Europe, Africa, the Far East, and the Near East. Domestic and wild goat populations shared a substantial number of casein SNP, from 36.1% (CSN2) to 55.1% (CSN1S2). The comparison of casein variation among bezoars and the 4 domestic goat populations demonstrated that more than 50% of the casein SNP are shared by 2 or more populations, and 18 to 44% are shared by all populations. Moreover, the majority of casein alleles reported in domestic goats also segregate in the bezoar, including several alleles displaying significant associations with milk composition (e.g., the A/B alleles of the CSN1S1 and CSN3 genes, the A allele of the CSN2 gene). We conclude that much of the current diversity of the caprine casein genes comes from ancient standing variation segregating in the ancestor of modern domestic goats.
Analysis of Shoreline Dynamics within a Section of Orashi River: Rivers State, Nigeria
Creators: name: Ishiagwoh Ben Temple, Lawrence Hart, Eze Promise Ikenda
Publisher: name: Zenodo
Year: 2024

description: The Orashi River under study has shown an uncontrolled change in geometry along the River Channel at different spots and locations due to several factors which includes persistence anthropogenic activities and natural interferences, Among others are, the proximity of the riparian dwellers to the shore of the river channel, the effects of erosion, the continuous sediment lose due to source depletion along the river, heavy annual rainfall and over flooding  occasioned by the release of water from Dams. The study is aim to analyze the shoreline dynamics in the study area for a period of thirty years with the objectives of determining the change in magnitude at 200m distances along the transects for each epoch and  rate of change. Remote Sensing techniques was utilized to achieve the study aim and objectives, LANDSAT MSS (L5), LANDSAT TM (L7), and LANDSAT OLI (L8) aerial imageries of the year 1992, 2002, 2012 and 2022 were acquired from United State Geological Services, ESRI’S Arc-GIS 10.3 software was used to extract the shoreline and provide interface for digital shoreline analysis system (DSAS) to give statistics of the change, DSAS Version 4.3 software was used to cast transects and compute shoreline rate.The imageries were geo-referenced to UTM Zone 32N projection system, WGS- 84 datum. Linear measurements were carried out onscreen on each transect of the left and right shore using the point, line and polygon spatial features to determine the positions and extent of each transect in the left and right hand side of the shoreline. The study revealed that an average rate of change of 23.734m and 33.102m in the left-hand side and right hand side of the shoreline respectively. The geometry of the shoreline also changed and varies within epoch under study and the average rate of change indicates more shoreline changes on the right-hand side of the river going through Akinima town towards Odiereke axis than the left-hand side of the Orashi river channel. River banks in sections of the shoreline were been collapse and seriously impacting on already tarred roads. Shore protection project is needed in the study area to forestall further collapse of river banks, flood and erosion
Multi-Self-Overlap Ensemble for protein folding: ground state search and thermodynamics
Creators: name: Chikenji, George
name: Kikuchi, Macoto
name: Iba, Yukito
Publisher: name: arXiv
Year: 1999
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantitative Biology (q-bio)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Long chains of the HP lattice protein model are studied by the Multi-Self-Overlap Ensemble(MSOE) Monte Carlo method, which was developed recently by the authors. MSOE successfully finds the lowest energy states reported before for sequences of the chain length $N=42\sim 100$ in two and three dimensions. Moreover, MSOE realizes the lowest energy state that ever found in a case of N=100. Finite-temperature properties of these sequences are also investigated by MSOE. Two successive transitions are observed between the native and random coil states. Thermodynamic analysis suggests that the ground state degeneracy is relevant to the order of the transitions in the HP model.
description: 4 pages, 4 figures
Relationships of Urban Design Elements and Social Sustainability in the Indian Context
Creators: name: Anwar Hussain, Sharmin Khan
Publisher: name: TuEngr Group
Year: 2021
Subjects: Non-physical factors
Social well-being
Physical factors
Sustainable development
Social quality
Indicators of social sustainability
Sustainable community
Socially sustainable society
Mixed land use
Urban compactness
Urban density
Urban transport
Urban edge
Urban landmark
Lynch's elements.

description: International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies, 12, 6, 12A6L: 1-9
Quantum correlation functions and the classical limit
Creators: name: Anastopoulos, Charis
Publisher: name: arXiv
Year: 2000
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the transition from the full quantum mechanical description of physical systems to an approximate classical stochastic one. Our main tool is the identification of the closed-time-path (CTP) generating functional of Schwinger and Keldysh with the decoherence functional of the consistent histories approach. Given a degree of coarse-graining in which interferences are negligible, we can explicitly write a generating functional for the effective stochastic process in terms of the CTP generating functional. This construction gives particularly simple results for Gaussian processes. The formalism is applied to simple quantum systems, quantum Brownian motion, quantum fields in curved spacetime. Perturbation theory is also explained. We conclude with a discussion on the problem of backreaction of quantum fields in spacetime geometry.
description: 30 pages, latex; minor changes, added some explanations and refeences
Proyecto P01.5. Prepara impresión y packaging
Creators: name: Gonçalves, Smara
Publisher: name: figshare
Year: 2019
Subjects: subject: 120306 Textile and Fashion Design
subject: FOS: Arts (arts, history of arts, performing arts, music)
subject: Design
subject: 91001 CAD/CAM Systems
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Ficha de la Entrega P01.5 del proyecto. Fase de preparación del archivo para impresión 3d y bocetaje del packaging.
Probing the Evolution of Gas Mass Fraction with Sunyaev-Zel'dovich Effect
Creators: name: Majumdar, Subhabrata
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Study of the primary anisotropies of the Cosmic Microwave Background (CMB) can be used to determine the cosmological parameters to a very high precision. The power spectrum of the secondary CMB anisotropies due to the thermal Sunyaev-Zel'dovich Effect (SZE) by clusters of galaxies, can then be studied, to constrain more cluster specific properties (like gas mass). We show the SZE power spectrum from clusters to be a sensitive probe of any possible evolution (or constancy) of the gas mass fraction. The position of the peak of the SZE power spectrum is a strong discriminatory signature of different gas mass fraction evolution models. For example, for a flat universe, there can be a difference in the $l$ values (of the peak) of {\it as much as 3000} between a constant gas mass fraction model and an evolutionary one. Moreover, observational determination of power spectrum, from blank sky surveys, is devoid of any selection effects that can possibly affect targeted X-ray or radio studies of gas mass fractions in galaxy clusters.
description: 4 pages plus 2 figures, uses emulateapj
Conversion of magnetic freedoms into atomic configurational freedoms within the Cluster Variation Method
Creators: name: Yamada, Ryo
name: Mohri, Tetsuo
Publisher: name: arXiv
Year: 2019
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The continuous displacement cluster variation method (CDCVM) has introduced local atomic displacements into the theoretical framework of the cluster variation method (CVM) by viewing an atom displaced from a Bravais lattice point as a particular atomic species located at the lattice point. This idea of conversion from a freedom of local displacements into configurational freedom is extended in this paper to magnetic freedoms. Various magnitudes of local magnetic moments are considered, as well as two spin directions, on up-spins and down-spins. The approach is applied to pure Ni and its Curie temperature is explored with the entropy formula of the tetrahedron approximation in the CVM, using the first-nearest-neighbor pair interaction energies extracted from the total energies of various spin configurations, which are estimated from electronic-structure calculations.
description: 18 pages, 10 figures
Magnetized orbifolds and localized flux
Creators: name: Buchmuller, Wilfried
name: Dierigl, Markus
name: Tatsuta, Yoshiyuki
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Magnetized orbifolds play an important role in compactifications of string theories and higher-dimensional field theories to four dimensions. Magnetic flux leads to chiral fermions, it can be a source of supersymmetry breaking and it is an important ingredient of moduli stabilization. Flux quantization on orbifolds is subtle due to the orbifold singularities. Generically, Wilson line integrals around these singularities are non-trivial, which can be interpreted as localized flux. As a consequence, flux densities on orbifolds can take the same values as on tori. We determine the transition functions for the flux vector bundle on the orbifold $T^2/\mathbb{Z}_2$ and the related twisted boundary conditions of zero-mode wave functions. We also construct "untwisted" zero-mode functions that are obtained for singular vector fields related to the Green's function on a torus, and we discuss the connection between zeros of the wave functions and localized flux. Twisted and untwisted zero-mode functions are related by a singular gauge transformation.
description: 36 pages, 13 figures, 2 tables
New insights into the electron trapping mechanism in LaAlO_3 / SrTiO3 heterostructures
Creators: name: Yin, Chunhai
name: Smink, Alexander E. M.
name: Leermakers, Inge
name: Tang, Lucas M. K.
name: Lebedev, Nikita
name: Zeitler, Uli
name: van der Wiel, Wilfred G.
name: Hilgenkamp, Hans
name: Aarts, Jan
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In LaAlO3/SrTiO3 heterostructures, a commonly observed but poorly understood phenomenon is that of electron trapping in back-gating experiments. In this work, by combining magnetotransport measurements and self-consistent Schroedinger-Poisson calculations, we obtain an empirical relation between the amount of trapped electrons and the gate voltage. We find that the trapped electrons follow an exponentially decaying spatial distribution away from the interface. However, contrary to earlier observations, we find that the Fermi level remains well within the quantum well. The enhanced trapping of electrons induced by the gate voltage can therefore not be explained by a thermal escape mechanism. Further gate sweeping experiments strengthen our conclusion that the thermal escape mechanism is not valid. We propose a new mechanism which involves the electromigration and clustering of oxygen vacancies in SrTiO3. Our work indicates that electron trapping is a universal phenomenon in SrTiO3-based two-dimensional electron systems.
description: manuscript + supplementary information, 8 pages
Atomistic Relaxation Process in a Ni3Al Ordered Phase Using Path Probability Method with Vacancy Mechanisms
Creators: name: Yamada, Ryo
name: Mohri, Tetsuo
Publisher: name: arXiv
Year: 2019
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The path probability method (PPM), which is a natural extension of the cluster variation method (CVM) to a time domain, has been employed in a relaxation process of atomic configurations in alloy systems. Although the vacancy mechanism is the main atomic migration process in an alloy system, most studies of PPM have used the spin flipping mechanism (or the direct exchange mechanism) because of the huge computational burden imposed by the vacancy mechanism. In this paper the computational problem is circumvented by treating various path variables in the PPM as cluster probabilities in the CVM, and the vacancy mechanism is explicitly taken into account in the theoretical framework. The method is employed to explore the relaxation process in a Ni3Al ordered phase within the tetrahedron approximation, and the effect of vacancy concentration is investigated.
description: 6 pages, 4 figures
Schrödinger operators with measure-valued potentials: semiboundedness and spectrum
Creators: name: Mikhailets, Vladimir
name: Molyboga, Volodymyr
Publisher: name: arXiv
Year: 2018
Subjects: subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: Primary 34B20, 34L40, Secondary 34B24, 47A10

description: We study the 1-D Schrödinger operators in Hilbert space $L^{2}(\mathbb{R})$ with real-valued Radon measure $q'(x)$, $q\in \mathrm{BV}_{loc}(\mathbb{R})$ as potentials. New sufficient conditions for minimal operators to be bounded below and selfadjoint are found. For such operators a criterion for the discreteness of the spectrum is proved, which generalizes Molchanov's, Brinck's, and the Albeverio-Kostenko-Malamud criteria. The quadratic forms corresponding to the investigated operators are described.
description: 17 pages
Ferroelectricity in the 1 $μ$C cm$^{-2}$ range induced by canted antiferromagnetism in (LaMn$_{3}$)Mn$_{4}$O$_{12}$
Creators: name: Gauzzi, A.
name: Milton, F.
name: Gastaldo, V. Pascotto
name: Verseils, M.
name: Gualdi, A.
name: Dreifus, D.
name: Klein, Y.
name: Garcia, D.
name: de Oliveira, A. J. A
name: Bordet, P.
name: Gilioli, E.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Pyroelectric current and magnetoelectric coupling measurements on polycrystalline samples of the quadruple perovskite (LaMn$_{3}$)Mn$_{4}$O$_{12}$ give evidence of ferroelectricity driven by the antiferromagnetic ordering of the $B$-site Mn$^{3+}$ ions at $T_{N,B}$=78 K with record values of remnant electric polarization up to $P$=0.56 $μ$C cm$^{-2}$. X-ray diffraction measurements indicates an anomalous behavior of the monoclinic $β$ angle at $T_{N,B}$, which suggests that $P$ lies in the $ac$-plane, where the moments are collinear, so we conclude that exchange striction is the mechanism of spin-driven ferroelectricity. Polarization values $\sim$3 $μ$C cm$^{-2}$ are expected in single crystals, which would open the avenue towards practical multiferroic applications.
description: 5 pages, 5 figures
Diffusion and Correlations in Lattice Gas Automata
Creators: name: Hanon, David
name: Boon, Jean Pierre
Publisher: name: arXiv
Year: 1997
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present an analysis of diffusion in terms of the spontaneous density fluctuations in a non-thermal two-species fluid modeled by a lattice gas automaton. The power spectrum of the density correlation function is computed with statistical mechanical methods, analytically in the hydrodynamic limit, and numerically from a Boltzmann expression for shorter time and space scales. In particular we define an observable -- the weighted difference of the species densities -- whose fluctuation correlations yield the diffusive mode independently of the other modes so that the corresponding power spectrum provides a measure of diffusion dynamics solely. Automaton simulations are performed to obtain measurements of the spectral density over the complete range of wavelengths (from the microscopic scale to the macroscopic scale of the automaton universe). Comparison of the theoretical results with the numerical experiments data yields the following results: (i) the spectral functions of the lattice gas fluctuations are in accordance with those of a classical `non-thermal' fluid; (ii) the Landau-Placzek theory, obtained as the hydrodynamic limit of the Boltzmann theory, describes the spectra correctly in the long wavelength limit; (iii) at shorter wavelengths and at moderate densities the complete Boltzmann theory provides good agreement with the simulation data. These results offer convincing validation of lattice gas automata as a microscopic approach to diffusion phenomena in fluid systems.
description: 9 pages (revtex source), 12 Postscript figures
Absence of Cooper-type bound states in three- and few-electron systems
Creators: name: Adhikari, Sadhan K.
name: Frederico, T.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: It is shown that the appearance of a fixed-point singularity in the kernel of the two-electron Cooper problem is responsible for the formation of the Cooper pair for an arbitrarily weak attractive interaction between two electrons. This singularity is absent in the problem of three and few superconducting electrons at zero temperature on the full Fermi sea. Consequently, such three- and few-electron systems on the full Fermi sea do not form Cooper-type bound states for an arbitrarily weak attractive pair interaction.
description: 10 pages. Accepted in European Physical Journal B
Chiral Optical Absorption by a Vortex in p_x \pm i p_y-Wave Superconductor
Creators: name: Matsumoto, Masashige
name: Sigrist, Manfred
Publisher: name: arXiv
Year: 1999
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The chiral optical absorption by a single vortex in a p_x \pm i p_y-wave superconductor is studied theoretically. The p_x \pm i p_y-wave state was recently suggested as the symmetry of the order parameter of Sr_2 Ru O_4 superconductor. Due to the violation of time reversal symmetry, there are two types of vortices whose winding orientation is the same or opposite to the angular momentum of the Cooper pair. In a real material domains with p_x \pm i p_y-wave states are expected. However, optical absorption of circular polarized light depends only on the winding of the vortex and has a low energy absorption peak which results in dichroism. Dichroism occurs if superconductivity is realized on a single Fermi surface sheet. However, in the case of several Fermi surface sheets dichroism may disappear, if the both types of carriers are present, electron-like and hole-like. Therefore chiral optical absorption is a possible experiment to detect the orbital dependent superconductivity which was suggested as the superconducting state of Sr_2 Ru O_4.
description: 5 pages, 6 figures, to be published in J. Phys. Soc. Jpn. Vol. 68 (1999) No. 3
Approximation to Singular Quadratic Collision Model in Fokker-Planck-Landau Equation
Creators: name: Li, Ruo
name: Wang, Yanli
name: Wang, Yixuan
Publisher: name: arXiv
Year: 2018
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We propose a Hermite-Galerkin spectral method to numerically solve the spatially homogeneous Fokker-Planck-Landau equation with singular quadratic collision model. To compute the collision model, we adopt a novel approximation formulated by a combination of a simple linear term and a quadratic term very expensive to evaluate. Using the Hermite expansion, the quadratic term is evaluated exactly by calculating the spectral coefficients. To deal with singularities, we make use of Burnett polynomials so that even very singular collision model can be handled smoothly. Numerical examples demonstrate that our method can capture low-order moments with satisfactory accuracy and performance.
NMR study of the S=1/2 Heisenberg Ladder Cu2(C5H12N2)2Cl4 : Quantum phase transition and critical dynamics
Creators: name: Chaboussant, G.
name: Fagot-Revurat, Y.
name: Julien, M. -H.
name: Hanson, M. E.
name: Berthier, C.
name: Horvatic, M.
name: Levy, L. P.
name: Piovesana, O.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present an extensive NMR study of the spin-1/2 antiferromagnetic Heisenberg ladder Cu2(C5H12N2)2Cl4 in a magnetic field range 4.5 - 16.7 T. By measuring the proton NMR relaxation rate 1/T_1 and varying the magnetic field around the critical field H_c1 = Delta / gμ_B = 7.5 T, we have studied the transition from a gapped spin liquid ground state to a gapless magnetic regime which can be described as a Luttinger liquid. We identify an intermediate regime T > |H-H_c1|, where the spin dynamics is (possibly) only controlled by the T=0 critical point H_c1.
description: 4 pages, 3 eps figures, submitted to Phys. Rev. Lett
Experimental evidence for Shekhtman-Entin-Wohlman-Aharony (SEA) interactions in Ba2CuGe2O7
Creators: name: Zheludev, A.
name: Maslov, S.
name: Zaliznyak, I.
name: Regnault, L. P.
name: Masuda, T.
name: Uchinokura, K.
name: Erwin, R.
name: Shirane, G.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: New neutron diffraction and inelastic neutron scattering experiments on Ba2CuGe2O7 suggest that the previously suggested model for the magnetism of this material (an ideal sinusoidal spin spiral, stabilized by isotropic exchange and Dzyaloshinskii-Moriya interactions) needs to be refined. Both new and previously published experimental results can be quantitatively explained by taking into account the Shekhtman-Entin-Wohlman-Aharony (SEA) term, a special anisotropy term that was predicted to always accompany Dzyaloshinskii-Moriya interactions in insulators. Our experimental results present the first clear evidence to that SEA interactions can lead to substantial observable effects in a real magnetic system.
description: 4 pages (RevTex), 4 figures (PS)
Optimized cavity-mediated dispersive two-qubit gates between spin qubits
Creators: name: Benito, M.
name: Petta, J. R.
name: Burkard, Guido
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The recent realization of a coherent interface between a single electron in a silicon quantum dot and a single photon trapped in a superconducting cavity opens the way for implementing photon-mediated two-qubit entangling gates. In order to couple a spin to the cavity electric field some type of spin-charge hybridization is needed, which impacts spin control and coherence. In this work we propose a cavity-mediated two-qubit gate and calculate cavity-mediated entangling gate fidelities in the dispersive regime, accounting for errors due to the spin-charge hybridization, as well as photon- and phonon-induced decays. By optimizing the degree of spin-charge hybridization, we show that two-qubit gates mediated by cavity photons are capable of reaching fidelities exceeding 90% in present-day device architectures. High iSWAP gate fidelities are achievable even in the presence of charge noise at the level of $2\,μ\text{eV}$.
description: 10 pages, 5 figures
Charge Segregation, Cluster Spin-Glass and Superconductivity in La1.94Sr0.06CuO4
Creators: name: Julien, M. -H.
name: Borsa, F.
name: Carretta, P.
name: Horvatic, M.
name: Berthier, C.
name: Lin, C. T.
Publisher: name: arXiv
Year: 1999
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A 63Cu and 139La NMR/NQR study of superconducting (Tc=7 K) La1.94Sr0.06CuO4 single crystal is reported. Coexistence of spin-glass and superconducting phases is found below ~5 K from 139La NMR relaxation. 63Cu and 139La NMR spectra show that, upon cooling, CuO2 planes progressively separate into two magnetic phases, one of them having enhanced antiferromagnetic correlations. These results establish the AF-cluster nature of the spin-glass. We discuss how this phase can be related to the microsegregation of mobile holes and to the possible pinning of charge-stripes.
description: 4 pages. Modified manuscript with clarifications
Proyecto P01.2. Modelado 3D de la hebilla
Creators: name: Gonçalves, Smara
Publisher: name: figshare
Year: 2019
Subjects: subject: 120306 Textile and Fashion Design
subject: FOS: Arts (arts, history of arts, performing arts, music)
subject: Design
subject: 91001 CAD/CAM Systems
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Ficha de la Entrega P01.2 del proyecto. Fase de modelado 3D de la hebilla
Turbulent duct flow with polymers
Creators: name: Shahmardi, Armin
name: Zade, Sagar
name: Ardekani, Mehdi N.
name: Poole, Rob J.
name: Lundell, Fredrik
name: Rosti, Marco Edoardo
name: Brandt, Luca
Publisher: name: arXiv
Year: 2018
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We have performed direct numerical simulation of the turbulent flow of a polymer solution in a square duct, with the FENE-P model used to simulate the presence of polymers. First, a simulation at a fixed moderate Reynolds number is performed and its results compared with those of a Newtonian fluid to understand the mechanism of drag reduction and how the secondary motion, typical of the turbulent flow in non-axisymmetric ducts, is affected by polymer additives. Our study shows that the Prandtl's secondary flow is modified by the polymers: the circulation of the streamwise main vortices increases and the location of the maximum vorticity move towards the center of the duct. In-plane fluctuations are reduced while the streamwise ones are enhanced in the center of the duct and dumped in the corners due to a substantial modification of the quasi-streamwise vortices and the associated near-wall low- and high-speed streaks; these grow in size and depart from the walls, their streamwise coherency increasing. Finally, we investigated the effect of the parameters defining the viscoelastic behavior of the flow and found that the Weissenberg number strongly influences the flow, with the cross-stream vortical structures growing in size and the in-plane velocity fluctuations reducing for increasing flow elasticity.
On the age of PSR B1509-58
Creators: name: Gvaramadze, V. V.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It is generally accepted that the PSR B1509-58 is associated with the supernova remnant (SNR) MSH 15-52 (G 320.4-01.2). The spin-down age of the pulsar is \simeq 1700 years, while the size and the general appearance of the SNR suggest that this system is much older. A few possible explanations of this discrepancy have been put forward. We offer an alternative one and suggest that the high spin-down rate of the pulsar characterizes only a relatively short period of its (present) spin history, and that the enhanced braking torque is connected with the interaction between the pulsar's magnetosphere and the dense matter of a circumstellar clump (created during the late evolutionary stages of the supernova (SN) progenitor star). Our suggestion implies that the "true" age of PSR B1509-58 could be much larger than the spin-down age, and therefore the SNR MSH 15-52 is a middle-aged remnant similar to the Vela SNR (G 263.9-3.3). We also suggest that the dense (neutral) gas of the circumstellar clump could be responsible for the enhanced neutral hydrogen absorption towards PSR B1509-58, and that the optical emission of an optical counterpart for PSR B1509-58 should rather be attributed to a bow shock around this pulsar than to the pulsar itself.
description: 5 pages, revised version accepted for publication in A&A
The Eocene carbonate platforms of the westernmost Tethys: a review
Creators: name: Martín-Martín, Manuel
name: Tosquella, Josep
name: Guerrera, Francesco
name: Maaté, Alí
name: Martín-Algarra, Agustín
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology

description: According to the prevailing view in literature, two Eocene carbonate platform belts developed on northern and southern margins of the Tethys Ocean. However, Eocene platforms in the Malaguide−Ghomaride Units (Betic-Rifian Arc; Spain and Morocco, respectively) in intermediate position to the classic platform belts have been proposed in recent literature. A number of representative Ypresian to Priabonian stratigraphic sections have been revisited and empowered by new data collected for the scope. Ten lithobiofacies (consisting of limestones rich in Larger Benthic Foraminifera (LBF), algae, and corals) and ten microfacies (based on fossil assemblage and their relative abundance, texture, and fabric) were proposed for this intermediate platform belt in recent literature. The paleoenvironmental reconstruction indicate inner to outer ramps (locally also the upper slope) arranged in two sedimentary sequences rich in LBF and corals. A great development of carbonate seagrass factories in most of the areas in which inner ramps developed has been identified. These factories correspond to a warm-temperate system with warm-water conditions mainly in low latitude settings. Trophic resources proposed in these works suggest oligo- to mesotrophic conditions in inner to mid ramp settings, which only evolve to eutrophic conditions in outer ramp and upper bathyal settings. A comparison of the three belts of carbonate platforms at the western Tethys scale has been performed, providing several important constraints in terms of the recorded time period according to the literature, tectonics, transgressive−regressive trendings, relative abundance of fossils, and paleoenvironmental conditions. The Eocene platforms of the westernmost Tethys show a lacunose geological record registered from upper Ypresian (Cuisian) to Bartonian. It shows an important gap at the upper Ypresian (Cuisian)−Lutetian boundary. LBF remained the primary framework builders elsewhere until the Bartonian age, with zooxanthelle−coral build-ups playing a more significant role in the inner ramps than previously assumed.
Tests of strong-field gravity and gravitational radiation damping in binary-pulsar systems
Creators: name: Esposito-Farese, G.
Publisher: name: arXiv
Year: 2000
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This talk reviews the constraints imposed by binary-pulsar data on gravity theories, and notably on "scalar-tensor" theories which are the most natural alternatives to general relativity. Because neutron stars have a strong gravitational binding energy, binary-pulsar tests are qualitatively different from solar-system experiments: They have the capability of probing models which are indistinguishable from general relativity in weak gravitational field conditions. Besides the two most precise binary-pulsar experiments, in the systems B1913+16 and B1534+12, we also present the results of the various "null" tests of general relativity provided by several neutron star-white dwarf binaries, notably those of gravitational radiation damping. [The main interest of this very short paper is its figure, which also takes into account the "strong equivalence principle" tests.]
description: 2 pages, "mprocl.sty" with LaTeX 2.09, uses "epsf.tex" to include 1 postscript figure; contribution to the 9th Marcel Grossmann Meeting (MG9), Rome, July 2000
Regional Features of the Spatial Distribution of Educational Capitals in Russia
Creators: name: Suvorova, Arina V.
Publisher: name: TuEngr Group
Year: 2021
Subjects: Educational investment
Spatial heterogeneity
Socioeconomic differentiation
GRP
Territorial capital
Russia region
Moran's index
Hall-Tydeman index (HT)
Geographic-based educational capital
Gini coefficient.

description: International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies, 12, 6, 12A6M: 1-12
Thermodynamic Properties of the Spin-1/2 Antiferromagnetic ladder Cu2(C2H12N2)2Cl4 under Magnetic Field
Creators: name: Calemczuk, R.
name: Riera, J.
name: Poilblanc, D.
name: Boucher, J. -P.
name: Chaboussant, G.
name: Levy, L.
name: Piovesana, O.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Specific heat ($C_V$) measurements in the spin-1/2 Cu$_2$(C$_2$H$_{12}$N$_2$)$_2$Cl$_4$ system under a magnetic field up to $H=8.25 T$ are reported and compared to the results of numerical calculations based on the 2-leg antiferromagnetic Heisenberg ladder. While the temperature dependences of both the susceptibility and the low field specific heat are accurately reproduced by this model, deviations are observed below the critical field $H_{C1}$ at which the spin gap closes. In this Quantum High Field phase, the contribution of the low-energy quantum fluctuations are stronger than in the Heisenberg ladder model. We argue that this enhancement can be attributed to dynamical lattice fluctuations. Finally, we show that such a Heisenberg ladder, for $H>H_{C1}$, is unstable, when coupled to the 3D lattice, against a lattice distortion. These results provide an alternative explanation for the observed low temperature ($T_C\sim 0.5K$ -- $0.8K$) phase (previously interpreted as a 3D magnetic ordering) as a new type of incommensurate gapped state.
description: Minor changes, list of authors completed
Lithium: potential and possibilities in the pegmatite belts of India – global perspectives and exploration strategies
Creators: name: Pandey, Abhishek
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Neuroscience
subject: Pharmacology
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Science Policy
subject: Mental Health

description: The global demand for lithium is steadily increasing, driving an increased focus on exploration efforts worldwide. Lithium, a crucial metal for lithium-ion batteries (LIBs) used in renewable energy technologies, is vital in the global drive to reduce carbon emissions. India’s ambitions to become a manufacturing hub for LIBs and achieve 100% electric vehicle (EV) sales by 2030 require significant quantities of lithium. However, challenges due to limited domestic reserves within the country, prompting efforts to define new exploration targets and develop existing lithium occurrences. Recent discoveries in northern Jammu and Kashmir and southern Karnataka highlight promising lithium deposits. This study focuses on India’s lithium exploration within pegmatite belts across various cratonic blocks, identifying significant potential for lithium exploration and mining. Notably, spodumene-rich pegmatites are found in Karnataka’s Dharwar Craton, while lepidolite-rich pegmatites exist in Rajasthan’s Aravalli-Delhi Fold Belt and the Madhya Pradesh-Chhattisgarh region. Regions like Bihar-Jharkhand, Maharashtra, Odisha, and Assam-Meghalaya also exhibit promise for lithium exploration. These findings emphasize the diverse lithological settings where lithium exploration can be strategically pursued in India. This study recommends adopting modern exploration techniques and developing cost-effective extraction technologies to advance India’s lithium exploration efforts. These initiatives are crucial in meeting the escalating demand for lithium and advancing India’s clean energy objectives in the transition to renewable energy sources.
Cohesion and conductance of disordered metallic point contacts
Creators: name: Burki, J.
name: Stafford, C. A.
name: Zotos, X.
name: Baeriswyl, D.
Publisher: name: arXiv
Year: 1999
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The cohesion and conductance of a point contact in a two-dimensional metallic nanowire are investigated in an independent-electron model with hard-wall boundary conditions. All properties of the nanowire are related to the Green's function of the electronic scattering problem, which is solved exactly via a modified recursive Green's function algorithm. Our results confirm the validity of a previous approach based on the WKB approximation for a long constriction, but find an enhancement of cohesion for shorter constrictions. Surprisingly, the cohesion persists even after the last conductance channel has been closed. For disordered nanowires, a statistical analysis yields well-defined peaks in the conductance histograms even when individual conductance traces do not show well-defined plateaus. The shifts of the peaks below integer multiples of $2e^2/h$, as well as the peak heights and widths, are found to be in excellent agreement with predictions based on random matrix theory, and are similar to those observed experimentally. Thus abrupt changes in the wire geometry are not necessary for reproducing the observed conductance histograms. The effect of disorder on cohesion is found to be quite strong and very sensitive to the particular configuration of impurities at the center of the constriction.
description: 10 pages, 7 figures, submitted to Phys. Rev. B, discussions of the equilibrium geometry and of the effects of disorder on the cohesion have been modified
Cutting temperatures in milling operations of difficult-to-cut materials
Creators: name: Soori, Mohsen
name: Asmael, Mohammed
Publisher: name: figshare
Year: 2021
Subjects: subject: 91001 CAD/CAM Systems
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Due to high strength-to-weight ratio and corrosion resistance, difficult-to-cut materials are used in the aerospace, automotive and medical industries. High mechanical and thermal loading occur during machining operations of difficult-to-cut materials, reducing cutting tool life and machining process performance. So, analyzing the cutting temperatures in milling operations of difficult-to-cut materials can increase the efficiency in production process of the parts from the alloys. Application of the virtual machining system is developed in the study to predict the cutting temperature during machining operations of difficult-to-cut materials such as Inconel 718, Titanium alloy Ti6Al4V and Nickel-base superalloy gH4133B. The modified Johnson–Cook model is used to analyze the coupled effects of strain rate and deformation temperature on flow stress during milling operations of the alloys. The finite element simulation of the milling operations is implemented for the alloys in order to obtain the cutting temperature of the cutting tool and workpiece during chip formation process. To validate the study, the experimental results are compared to the finite element results obtained from the virtual machining system. As a result, the study can provide an effective device in terms of efficiency enhancement of machining operations by analyzing and decreasing the cutting temperature in milling operation of difficult-to-cut materials.
Permo-Triassic source-to-sink systems of the Turpan basin: insights into three tectonic evolutionary episodes and their implications for the formation rhythm of the Central Asian Orogenic Belt
Creators: name: Li, Fuxiang
name: Xu, Shenglin
name: Chen, Anqing
name: Tang, Wenbin
name: Yang, Shuai
name: Sun, Shi
name: Chen, Hongde
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Physical Sciences not elsewhere classified
subject: Physiology
subject: FOS: Biological sciences
subject: Evolutionary Biology
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: Astronomical and Space Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Infectious Diseases
subject: FOS: Health sciences

description: The Tianshan Orogenic Belt underwent a series of complex tectonic changes from the Late Palaeozoic to the Cenozoic, providing key insights into the evolution of the Central Asian Orogenic Belt (CAOB). The continuous Permo-Triassic sedimentary records of the Turpan Basin are among the best archives of the tectonic evolution of the Tianshan Orogenic Belt. However, the evolution of the Turpan Basin during this period is poorly understood. Using detrital zircon U-Pb chronology and geochemistry, we reconstructed the source-to-sink system changes and the basinal tectonic evolution in the Permo-Triassic, thus providing new evidence of its tectonic evolution. Our results show that the Early-Middle Permian source-to-sink systems of the Turpan Basin were mainly proximal and constrained by horst and graben landforms due to internal extension formed in the back-arc setting during accretionary orogenesis in Central Asia. In the Late Permian-Early Triassic, exotic sources, including the North Tianshan and Yili Block-Central Tianshan, dominated the source-to-sink system, which suggests that rifts were infilled and expanded across the entire thermal sag basin. In the Middle-Late Triassic, the sediment sources diversified, with external and internal provenances revealing that a foreland basin formed with thrusting at the southern margin, and the intraplate-associated Bogda forebulge experienced initial uplift, signifying that the CAOB gradually changed from an accretionary to an extrusive orogeny. The three evolutionary episodes of the Turpan Basin implicated the long-lasting effect of the orogenic process from the final closure of Palaeo-Asian Ocean to the following build-up of the CAOB.
Quantum Monte Carlo Study of Hole Binding and Pairing Correlations in the Three-Band Hubbard Model
Creators: name: Guerrero, M.
name: Gubernatis, J. E.
name: Zhang, Shiwei
Publisher: name: arXiv
Year: 1997
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We simulated the 3-band Hubbard model using the Constrained Path Monte Carlo (CPMC) method in search for a possible superconducting ground state. The CPMC is a ground state method which is free of the exponential scaling of computing time with system size. We calculated the binding energy of a pair of holes for systems up to $6 \times 4$ unit cells. We also studied the pairing correlation functions versus distance for both the d-wave and extended s-wave channels in systems up to $6 \times 6$. We found that holes bind for a wide range of parameters and that the binding increased as the system size is increased. However, the pairing correlation functions decay quickly with distance. For the extended s channel, we found that as the Coulomb interaction $U_d$ on the Cu sites is increased, the long-range part of the correlation functions is suppressed and fluctuates around zero. For the $d_{x^2 - y^2}$ channel, we found that the correlations decay rapidly with distance towards a small positive value. However, this value becomes smaller as the interaction $U_d$ or the system size is increased.
description: 21 pages, 13 Postscript figures, Submitted to Phys. Rev. B
Multivortex states and dynamics in nonequilibrium quantum fluids
Creators: name: Gladilin, Vladimir
name: Wouters, Michiel
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: In strongly nonequilibrium Bose-Einstein condensates described by the generalized Gross-Pitaevskii equation, vortex motion becomes self-accelerated while the long-range vortex-antivortex interaction appears to be repulsive. We numerically study the impact of these rather unusual vortex properties on the dynamics of multivortex systems. We show that at strong nonequilibrium the repulsion between vortices and antivortices leads to a dramatic slowdown of their annihilation. Moreover, in finite-size samples, relaxation of multivortex systems can lead to the formation of metastable vortex-antivortex clusters, whose shape and size depend, in particular, on the sample geometry, boundary conditions and deviations from equilibrium. We further demonstrate that at strong nonequilibrium the interaction of self-accelerated vortices with inhomogeneous condensate flows can lead to generation of new vortex-antivortex pairs.
description: 10 pages, 10 figures