cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Multiferroic behavior of Aurivillius Bi4Mn3O12 from first-principles
Creators: name: Tinte, Silvia
name: Stachiotti, M. G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The multiferroic behavior of the hypothetical Aurivillius compound Bi4Mn3O12 has been explored on the basis of density functional calculations. We find that the tetragonal paraelectric phase of this material is ferromagnetic, showing ferroelectric and antiferrodistortive instabilities similar to the ones observed in its ferroelectric parent compound Bi4Ti3O12 . Our results indicate, however, that the presence of Mn+4 ions at the B-sites shrinks the cell volume and consequently the unstable polar mode, associated with the ferroelectric polarization, is overcame by an antiferrodistortive distortion. In this way, Bi4Mn3O12 exhibits incipient ferroelectricity at its equilibrium volume. We show that the ferroelectric state can be favored by strain or partial substitution of Mn with Ti.
description: 6 pages, 5 figures
Kurzbericht über die konservatorischen Arbeiten in Musawwarat es Sufra
Creators: name: Wolf, Pawel
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Metallicity and Temperature Indicators in M dwarf K band Spectra: Testing New & Updated Calibrations With Observations of 133 Solar Neighborhood M dwarfs
Creators: name: Rojas-Ayala, Bárbara
name: Covey, Kevin R.
name: Muirhead, Philip S.
name: Lloyd, James P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present K band spectra for 133 nearby (d < 33 parsecs) M dwarfs, including 18 M dwarfs with reliable metallicity estimates (as inferred from an FGK type companion), 11 M dwarf planet hosts, more than 2/3 of the M dwarfs in the Northern 8 pc sample, and several M dwarfs from the LSPM catalog. From these spectra, we measure equivalent widths of the Ca and Na lines, and a spectral index quantifying the absorption due to H2O opacity (the H2O-K2 index). Using empirical spectral types standards and synthetic models, we calibrate the H2O-K2 index as an indicator of an M dwarf's spectral type and effective temperature. We also present a revised relationship that estimates the [Fe/H] and [M/H] metallicities of M dwarfs from their Na I, Ca I, and H2O-K2 measurements. Comparisons to model atmosphere provide a qualitative validation of our approach, but also reveal an overall offset between the atomic line strengths predicted by models as compared to actual observations. Our metallicity estimates also reproduce expected correlations with Galactic space motions and H alpha emission line strengths, and return statistically identical metallicities for M dwarfs within a common multiple system. Finally, we find systematic residuals between our H2O-based spectral types and those derived from optical spectral features with previously known sensitivity to stellar metallicity, such as TiO, and identify the CaH1 index as a promising optical index for diagnosing the metallicities of near-solar M dwarfs.
description: 132 pages, 48 figures. Paper resubmitted to ApJ
Measurement of the polarization observables T, P, H in pseudoscalar meson photoproduction with the CBELSA/TAPS experiment
Creators: name: Hartmann, Jan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The CBELSA/TAPS experiment with a longitudinally or transversely polarized target and an energy tagged, linearly or circularly polarized photon beam allows the measurement of a large set of polarization observables. Due to its good energy resolution and high detection efficiency for photons, as well as the nearly complete solid angle coverage, it is ideally suited for the measurement of neutral mesons decaying into photons. Preliminary results for the target asymmetry T, the recoil polarization P, and the double polarization observable H are shown for π^0 and ηphotoproduction off the proton.
description: 4 pages, 3 figures. Proceedings of NSTAR 2011 conference
Jagged physics data analysis with numba, awkward and uproot on a GPU
Creators: name: Pata, Joosep
Publisher: name: Zenodo
Year: 2020

description: Notebook tutorial showing how to connect uproot, awkward-array, cupy and numba to do numerically intensive physics data processing such as histogramming directly on a GPU.
Vector-tensor gravity from a broken gauge symmetry
Creators: name: Chagoya, Javier
name: Sabido, M.
name: Silva-García, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we present a Yang-Mills type gauge theory of vector-tensor gravity, where the tetrad, the spin connection and vector field are identified with components of the gauge field. This setup leads to a theory that is contained in Generalized Proca theories. We solve for static and spherically symmetric space-time and show that there are two branches of solutions, one where the metric is asymptotically Schwarzschild even though there is a cosmological constant in the action, and another one where the metric is asymptotically (anti-)de Sitter. Also, we study the effect of the vector field on homogeneous and isotropic spacetimes, finding that it contributes to the accelerated expansion of the metric.
Front page PPP 2020(1)
Creators: name: Abu-Samah, Asma
name: Yahya, Iskandar
name: Mohd Hafiz Baharuddin
name: Mohd Hairi Mohd Zaman
name: Noraishikin Zulkarnain
name: Nor Azwan Mohamed Kamari
Publisher: name: Zenodo
Year: 2020

description: Prosiding Penyelidikan Prasiswazah, Issue No. 1, 2020
Grain boundary stresses in elastic materials
Creators: name: Shawish, Samir El
name: Mede, Timon
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: A simple analytical model of intergranular normal stresses is proposed for a general elastic polycrystalline material with arbitrary shaped and randomly oriented grains under uniform loading. The model provides algebraic expressions for the local grain-boundary-normal stress and the corresponding uncertainties, as a function of the grain-boundary type, its inclination with respect to the direction of external loading and material-elasticity parameters. The knowledge of intergranular normal stresses is a necessary prerequisite in any local damage modeling approach, e.g., to predict the intergranular stress-corrosion cracking, grain-boundary sliding or fatigue-crack-initiation sites in structural materials. The model is derived in a perturbative manner, starting with the exact solution of a simple setup and later successively refining it to account for higher order complexities of realistic polycrystalline materials. In the simplest scenario, a bicrystal model is embedded in an isotropic elastic medium and solved for uniaxial loading conditions, assuming 1D Reuss and Voigt approximations on different length scales. In the final iteration, the grain boundary becomes a part of a 3D structure consisting of five 1D chains with arbitrary number of grains and surrounded by an anisotropic elastic medium. Constitutive equations can be solved for arbitrary uniform loading, for any grain-boundary type and choice of elastic polycrystalline material. At each iteration, the algebraic expressions for the local grain-boundary-normal stress, along with the corresponding statistical distributions, are derived and their accuracy systematically verified and validated against the finite element simulation results of different Voronoi microstructures.
description: 28 pages, 20 figures
IX-XI CENTURIES DEVELOPMENT OF PEDAGOGICAL THOUGHTS AND EDUCATIONAL-ETHICAL THOUGHTS DURING THE EASTERN RENAISSANCE.
Creators: name: Yunusalieva, Nargiza
Publisher: name: Zenodo
Year: 2023

description: In this article, the views of great thinkers and their works on the development of pedagogical ideas and educational-ethical ideas during the Eastern Renaissance of the 9th-11th centuries are presented. now in the sense of the Academy) information is also given.
Quantum Superposition of Massive Objects and Collapse Models
Creators: name: Romero-Isart, Oriol
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We analyze the requirements to test some of the most paradigmatic collapse models with a protocol that prepares quantum superpositions of massive objects. This consists of coherently expanding the wave function of a ground-state-cooled mechanical resonator, performing a squared position measurement that acts as a double slit, and observing interference after further evolution. The analysis is performed in a general framework and takes into account only unavoidable sources of decoherence: blackbody radiation and scattering of environmental particles. We also discuss the limitations imposed by the experimental implementation of this protocol using cavity quantum optomechanics with levitating dielectric nanospheres.
description: 19 pages, 17 figures
Co-constructing stories of "we" and "us" with cohabitating couples
Creators: name: Rogers, Marnie
Publisher: name: Graduate Studies
Year: 2012
Subjects: subject: Educational Psychology
subject: Counselling
subject: couples
subject: Narrative

description: In this research, I examine how cohabitating couples co-constructed stories of mutuality and “we-ness” in conversations with me. Using Gubrium and Holstein’s (2009) approach to analyzing narrative reality, based within a social constructionist perspective, I study how participants and I co-narrated and co-edited stories of relational identity. I pay particular attention to my role as researcher, and how I was active in inviting and shaping these stories of “we-ness.” In my analysis, I also attend to how participants and I co-managed the stakes of storytelling, as we were developing plotlines about who they were as a couple and where they were going as partners. In their interviews, participants indicated that talking with me about “we-ness” had strengthened their sense of relational identity. I discuss the implications of my results for both research and counselling, and particularly for how counsellors can actively invite clients into telling stories of “we-ness.”
Wind is free : the city of Frederikshavn and the quest for civic sustainability
Creators: name: Wright, Peter Alexander
Publisher: name: University of British Columbia
Year: 2010

description: As Global Warming becomes an increasing problem, many cities across the world are looking for ways to reduce their harmful emissions and become more sustainable. Some cities are trying to accomplish this by adding park space, constructing more energy-efficient buildings or using electricity to power public transportation. These changes, while facilitating a reduction in emissions, do not allow a city to become sustainable because they are on too small a scale, nor do they account for emissions caused by other aspects of a city. The existing theories on sustainability in cities are insufficient. They cover certain aspects of sustainability, but they do not address the entire city as a whole. They also fail to discuss the most important concept of sustainability, which is sustainable energy. Sustainable energy provides environmentally-friendly, inexpensive energy without the harmful side-effects or exorbitant costs associated with fossil-fuel plants. This paper attempts to prove that a city can only be completely sustainable if it is powered solely by sustainable energy sources. To prove this, a case study of Frederikshavn, Denmark will be provided. By 2015, Frederikshavn will be the first city in the world powered exclusively by sustainable energy. The civic authorities in Frederikshavn are following a top-down approach that ensures that the sustainable energy conversion proceeds successfully, while at the same time being beneficial to both business interests and the local population. If and when Frederikshavn is successful, the techniques used and the lessons learned will be transferable to other cities in the world. This will ensure cities become increasingly sustainable, and Global Warming will be addressed in an appropriate manner.
Editorial
Creators: name: Wenig, Steffen
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
A Search for Diffuse X-ray Emission from GeV Detected Galactic Globular Clusters
Creators: name: Eger, P.
name: Domainko, W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Recently, diffuse and extended sources in TeV gamma-rays as well as in X-rays have been detected in the direction of the Galactic globular cluster (GC) Terzan 5. Remarkably, this is among the brightest GCs detected in the GeV regime. The nature of both the TeV and the diffuse X-ray signal from Terzan 5 is not settled yet. These emissions most likely indicate the presence of several non-thermal radiation processes in addition to these giving rise to the GeV signal. The aim of this work is to search for diffuse X-ray emission from the GeV detected GCs M 62, NGC 6388, NGC 6541, M 28, M 80 and NGC 6139 to compare the obtained results with the signal detected from Terzan 5. This study will help to determine whether Terzan 5 stands out amongst other GC or whether a whole population of globular clusters feature similar properties. None of the six GCs show significant diffuse X-ray emission on similar scales as observed from Terzan 5 above the particle and diffuse galactic X-ray background components. The derived upper limits allow to assess the validity of different models that were discussed in the interpretation of the multi-wavelength data of Terzan 5. A scenario based on synchrotron emission from relativistic leptons provided by the millisecond pulsar population can not be securely rejected if a comparable magnetic field strength as in Terzan 5 is assumed for every GC. However, such a scenario seems to be unlikely for NGC 6388 and M 62. An inverse-Compton scenario relying on the presence of a putative GRB remnant with the same properties as the one proposed for Terzan 5 can be ruled out for all of the six GCs. Finally, the assumption that each GC hosts a source with the same luminosity as in Terzan 5 is ruled out for all GCs but NGC 6139. (abridged)
description: 8 pages, 1 Figure, accepted for publication by Astronomy & Astrophysics, final version after language editing
Numerical simulations of quantum clock for measuring tunneling times
Creators: name: Suzuki, Fumika
name: Unruh, William G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We numerically study two methods of measuring tunneling times using a quantum clock. In the conventional method using the Larmor clock, we show that the Larmor tunneling time can be shorter for higher tunneling barriers. In the second method, we study the probability of a spin-flip of a particle when it is transmitted through a potential barrier including a spatially rotating field interacting with its spin. According to the adiabatic theorem, the probability depends on the velocity of the particle inside the barrier. It is numerically observed that the probability increases for higher barriers, which is consistent with the result obtained by the Larmor clock. By comparing outcomes for different initial spin states, we suggest that one of the main causes of the apparent decrease in the tunneling time can be the filtering effect occurring at the end of the barrier.
description: 8 pages, 6 figures
Thermoelectric study of the time-dependent Resonant Level Model
Creators: name: Slimane, Adel Kara
name: Fleury, Geneviève
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the non-interacting time-dependent resonant level model mimicking a driven quantum dot connected through leads to two electronic reservoirs held at different temperatures and electrochemical potentials. Using a scattering approach, we provide analytical formulas of the time-dependent particle currents, heat currents, and input driving power under the wide-band limit approximation. We also derive Landauer formulas for the corresponding time-integrated quantities when the perturbation applied on the dot is of finite duration. Then, we focus on the case of a single square pulse, benchmark our analytical results against numerical ones that are valid beyond the wide-band limit, and perform numerical simulations for a smooth square pulse and a periodic square pulse train. Finally, we discuss whether the efficiency of the device in a stationary Seebeck configuration can be enhanced by driving the dot potential. We find numerically that the transient increase of the efficiency observed in some cases is eventually cancelled out at long times.
description: 11 pages, 6 figures, 1 appendix; final version as published
Central free-free-dominated 880 $\micron$ emission in II Zw 40
Creators: name: Hirashita, Hiroyuki
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The central star-forming region in a blue compact dwarf galaxy, II Zw 40, was observed in the 340 GHz ($880 \micron$) band at $\sim 5$ arcsec (250 pc) resolution with the Submillimetre Array (SMA). A source associated with the central star-forming complex was detected with a flux of $13.6\pm 2.0$ mJy. The structure is more extended than the beam in the east-west direction. The SMA 880 $\micron$ flux is analyzed by using theoretical models of radio spectral energy distribution along with centimetre interferometric measurements in the literature. We find (i) that the SMA 880 $\micron$ flux is dominated ($\sim 75$ per cent) by free-free emission from the central compact star-forming region, and (ii) that the contribution from dust emission to the SMA 880 $\micron$ flux is at most $4\pm 2.5$ mJy. We also utilize our models to derive the radio--FIR relation of the II Zw 40 centre, suggesting that free-free absorption at low frequencies ($ν\la$ several GHz; $λ\ga$ several cm) and spatial extent of dust affect the radio-FIR relation.
description: 10 pages, 5 pages, accepted for publication in MNRAS
MEtabolome-TRanscriptome Correlation Analysis
Creators: name: Suntornsaratoon, Panan
name: Ferraris, Ronaldo P.
name: Ambat, Jayanth
name: Antonio, Jayson M.
name: Flores, Juan
name: Jones, Abigail
name: Su, Xiaoyang
name: Gao, Nan
name: Li, Wei Vivian
Publisher: name: Zenodo
Year: 2023

description: Code and data for "Metabolomic and transcriptomic correlative analyses in germ free mice link LGG-associated metabolites to host intestinal fatty acid metabolism and beta-oxidation".
Origin of the submillimeter radio emission during the time-extended phase of a solar flare
Creators: name: Trottet, G.
name: Raulin, J. -P.
name: de Castro, G. Giménez
name: Lüthi, T.
name: Caspi, A.
name: Mandrini, C. H.
name: Luoni, M. L.
name: Kaufmann, P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Solar flares observed in the 200-400 GHz radio domain may exhibit a slowly varying and time-extended component which follows a short (few minutes) impulsive phase and which lasts for a few tens of minutes to more than one hour. The few examples discussed in the literature indicate that such long-lasting submillimeter emission is most likely thermal bremsstrahlung. We present a detailed analysis of the time-extended phase of the 2003 October 27 (M6.7) flare, combining 1-345 GHz total-flux radio measurements with X-ray, EUV, and Hα observations. We find that the time-extended radio emission is, as expected, radiated by thermal bremsstrahlung. Up to 230 GHz, it is entirely produced in the corona by hot and cool materials at 7-16 MK and 1-3 MK, respectively. At 345 GHz, there is an additional contribution from chromospheric material at a few 10^4 K. These results, which may also apply to other millimeter-submillimeter radio events, are not consistent with the expectations from standard semi-empirical models of the chromosphere and transition region during flares, which predict observable radio emission from the chromosphere at all frequencies where the corona is transparent.
description: 27 pages, 7 figures
Correlation-driven organic 3D topological insulator with relativistic fermions
Creators: name: Nomoto, Tetsuya
name: Imajo, Shusaku
name: Akutsu, Hiroki
name: Nakazawa, Yasuhiro
name: Kohama, Yoshimitsu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Exploring new topological phenomena and functionalities induced by strong electron correlation has been a central issue in modern condensed-matter physics. One example is a topological insulator (TI) state and its functionality driven by the Coulomb repulsion rather than a spin-orbit coupling. Here, we report a "correlation-driven" TI state realized in an organic zero-gap system $α$-(BETS)$_2$I$_3$. The surface metallic state that emerges at low temperatures exhibits characteristic transport properties of a gapless Dirac semimetal, evidencing the presence of a topological surface state in this compound. Moreover, we observe a topological phase switching between the TI state and non-equilibrium Dirac semimetal state by a dc current, which is a unique functionality of a correlation-driven TI state. Our findings demonstrate that correlation-driven TIs are promising candidates not only for practical electronic devices but also as a field for discovering new topological phenomena and phases.
description: 36 pages including 10 figures
Experimental evidence of thermal fluctuations on the X-ray absorption near-edge structure at the aluminum K-edge
Creators: name: Manuel, Damien
name: Cabaret, Delphine
name: Brouder, Christian
name: Sainctavit, Philippe
name: Bordage, Amélie
name: Trcera, Nicolas
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: After a review of temperature-dependent experimental x-ray absorption near-edge structure (XANES) and related theoretical developments, we present the Al K-edge XANES spectra of corundum and beryl for temperature ranging from 300K to 930K. These experimental results provide a first evidence of the role of thermal fluctuation in XANES at the Al K-edge especially in the pre-edge region. The study is carried out by polarized XANES measurements of single crystals. For any orientation of the sample with respect to the x-ray beam, the pre-edge peak grows and shifts to lower energy with temperature. In addition temperature induces modifications in the position and intensities of the main XANES features. First-principles DFT calculations are performed for both compounds. They show that the pre-edge peak originates from forbidden 1s to 3s transitions induced by vibrations. Three existing theoretical models are used to take vibrations into account in the absorption cross section calculations: i) an average of the XANES spectra over the thermal displacements of the absorbing atom around its equilibrium position, ii) a method based on the crude Born-Oppenheimer approximation where only the initial state is averaged over thermal displacements, iii) a convolution of the spectra obtained for the atoms at the equilibrium positions with an approximate phonon spectral function. The theoretical spectra so obtained permit to qualitatively understand the origin of the spectral modifications induced by temperature. However the correct treatment of thermal fluctuation in XANES spectroscopy requires more sophisticated theoretical tools.
Flavour bounds on the flavon of a minimal and a non-minimal $\mathcal{Z}_2 \times \mathcal{Z}_N$ symmetry
Creators: name: Abbas, Gauhar
name: Singh, Vartika
name: Singh, Neelam
name: Sain, Ria
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We investigate flavour bounds on the $\mathcal{Z}_2 \times \mathcal{Z}_5$ and $\mathcal{Z}_2 \times \mathcal{Z}_9$ flavour symmetries. These flavour symmetries are a minimal and a non-minimal forms of the $\mathcal{Z}_2 \times \mathcal{Z}_N$ flavour symmetry, that can provide a simple set-up for the Froggatt-Nielsen mechanism. The $\mathcal{Z}_2 \times \mathcal{Z}_5$ and $\mathcal{Z}_2 \times \mathcal{Z}_9$ flavour symmetries are capable of explaining the fermionic masses and mixing pattern of the standard model including that of the neutrinos. The bounds on the parameter space of the flavon field of the $\mathcal{Z}_2 \times \mathcal{Z}_5$ and $\mathcal{Z}_2 \times \mathcal{Z}_9$ flavour symmetries are derived using the current quark and lepton flavour physics data and future projected sensitivities of quark and lepton flavour effects. The strongest bounds on the flavon of the $\mathcal{Z}_2 \times \mathcal{Z}_5$ symmetry come from the $D^0 - \bar D^0$ mixing. The bounds on the $\mathcal{Z}_2 \times \mathcal{Z}_9$ flavour symmetry are stronger than that of the minimal $\mathcal{Z}_2 \times \mathcal{Z}_5$ symmetry. The ratio $R_{μμ}$ provides rather robust bounds on the flavon parameters in the future phase-\rom{1} and phase-\rom{2} of the LHCb by leaving only a very small region in the allowed parameter space of the models.
description: 40 pages, 27 figures, accepted version in EPJC
The Magnetic Structure of DyMn2O5 Determined by Resonant X-ray Scattering
Creators: name: Johnstone, G. E.
name: Ewings, R. A.
name: Johnson, R. D.
name: Mazzoli, C.
name: Walker, H. C.
name: Boothroyd, A. T.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Resonant magnetic x-ray scattering has been used to investigate the magnetic structure of the magnetoelectric multiferroic DyMn2O5. We have studied the magnetic structure in the ferroelectric phase of this material, which displays the strongest ferroelectric polarisation and magnetodielectric effect of the RMn2O5 (where R is a rare earth ion, Y or Bi) family. The magnetic structure observed is similar to that of the other members of the series, but differs in the direction of the ordered moments. In DyMn2O5 both the Dy and Mn moments lie close to the b-axis, whereas in other RMn2O5 they lie close to the a-axis.
description: 8 pages, 8 figures
Dense properties of the space of the circle diffeomorphisms with a Liouville rotation number
Creators: name: Matsumoto, Shigenori
Publisher: name: arXiv
Year: 2011
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37E10, 37E45

description: Given any Liouville number $α$, it is shown that various subspaces are $C^\infty$-dense in the space of the orientation preserving $C^\infty$ diffeomorphisms of the circle with rotation number $α$.
description: 15pages, no figure
OPEN SOURCE INFORMATION AND LEARNING IN HIGHER EDUCATION USING SIMPLE AND FREE PLATFORMS
Creators: name: Kulkarni, Prajot
name: Shankargoud Patil
Publisher: name: Zenodo
Year: 2020
Subjects: Open source learning (OSL)
massive open online courses(MOOC)
STEM education

description: Internet is flooded with information, whenever a student or educator tries to find some information or notes online, its difficult to find the correct and proper content. The information available on some sites is not open or free to access. This paper discusses and aims in creating an open information platform related to the courses and subjects with a motto of OSL (open source learning) for higher education. Using internet as a tool for structuring and building a simple platform for storing data related to one’s courses and subjects, we can achieve the motto of open source information and learning for higher education system. The OSL (open source learning) platform can be handled by a mutually organised community under proper guidelines and instructions, allowing students, professors and STEM educators to use, reuse and rebuild the content for the repository. MOOCs (massive open online courses) can be added to this platform. This platform will be helpful for many students and STEM educators for creating more content for other students and will act as a repository. They can independently create videos, images and text, and add it to the platform with the communities permission. A proper structure to build a platform and guidelines are discussed in this paper.
Statics and dynamics of inhomogeneous liquids via the internal-energy functional
Creators: name: Schmidt, Matthias
Publisher: name: arXiv
Year: 2011
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We give a variational formulation of classical statistical mechanics where the one-body density and the local entropy distribution constitute the trial fields. Using Levy's constrained search method it is shown that the grand potential is a functional of both distributions, that it is minimal in equilibrium, and that the minimizing fields are those at equilibrium. The functional splits into a sum of entropic, external energetic and internal energetic contributions. Several common approximate Helmholtz free energy density functionals, such as the Rosenfeld fundamental measure theory for hard sphere mixtures, are transformed to internal energy functionals. The variational derivatives of the internal energy functional are used to generalize dynamical density functional theory to include the dynamics of the microscopic entropy distribution, as is relevant for studying heat transport and thermal diffusion.
description: 9 pages, 64 formulae
A Hamiltonian approach to small time local attainability of manifolds for nonlinear control systems
Creators: name: Soravia, Pierpaolo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 49L20, Secondary 93B05, 35F21, 35D40

description: This paper develops a new approach to small time local attainability of smooth manifolds of any dimension, possibly with boundary and to prove Hölder continuity of the minimum time function. We give explicit pointwise conditions of any order by using higher order hamiltonians which combine derivatives of the controlled vector field and the functions that locally define the target. For the controllability of a point our sufficient conditions extend some classically known results for symmetric or control affine systems, using the Lie algebra instead, but for targets of higher dimension our approach and results are new. We find our sufficient higher order conditions explicit and easy to use for targets with curvature and general control systems.
Computer Vision Aiding Smartphone Sensors for Indoor Location Applications
Creators: name: Kazemipur, Bashir
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Engineering
subject: Computer Vision
subject: Indoor Navigation
subject: Sensor Fusion

description: Modern mobile phones are powerful processing devices with a host of onboard technologies of interest to navigation system designers. In the absence of Global Navigation Satellite System (GNSS) information, the accelerometers and gyroscopes within a smartphone can be used to provide a relative navigation solution. However, these micro-electro-mechanical systems (MEMS) based sensors suffer from the effects of various errors which cause the inertial-only solution to deteriorate rapidly. As such, there is a need to constrain the inertial positioning solution when long-term navigation is needed. GNSS positions and velocities, and WiFi positions when available, are the most important forms of updates available for the inertial solution. However, updates from these two sources depend on external signals and infrastructure that may not always be available. One attractive source of updates is through the use of a vision sensor. This work describes the development of a vision-based module that determines the device heading misalignment and context based on a sequence of images captured from the device camera. The vision aiding module checks for static periods and calculates the device heading misalignment when in motion. Context classification is assessed for five common use cases: (1) fidgeting the phone while standing still (“fidgeting” context), (2) phone on ear on one floor (“single floor calling” context), (3) phone on ear on stairs (“stairs calling” context), (4) phone in hand on a single floor (“single floor texting” context), and (5) phone in hand on stairs (“stairs texting” context). The module was tested using real-time video and inertial data collected using a Samsung Galaxy S3 smartphone running the Android 4.0 operating system. The results show successful detection of the aforementioned use cases and accurate device angles. Integration of the vision aiding module with a pedestrian dead reckoning (PDR) system shows improvements to the position solution.
Generalized fractional calculus with applications to the calculus of variations
Creators: name: Odzijewicz, Tatiana
name: Malinowska, Agnieszka B.
name: Torres, Delfim F. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 26A33, 34A08, 49K05, 49K21

description: We study operators that are generalizations of the classical Riemann-Liouville fractional integral, and of the Riemann-Liouville and Caputo fractional derivatives. A useful formula relating the generalized fractional derivatives is proved, as well as three relations of fractional integration by parts that change the parameter set of the given operator into its dual. Such results are explored in the context of dynamic optimization, by considering problems of the calculus of variations with general fractional operators. Necessary optimality conditions of Euler-Lagrange type and natural boundary conditions for unconstrained and constrained problems are investigated. Interesting results are obtained even in the particular case when the generalized operators are reduced to be the standard fractional derivatives in the sense of Riemann-Liouville or Caputo. As an application we provide a class of variational problems with an arbitrary kernel that give answer to the important coherence embedding problem. Illustrative optimization problems are considered.
description: Submitted 22-Dec-2011; revised 26-Jan-2012; accepted 27-Jan-2012; for publication in Computers and Mathematics with Applications
Inhalt
Creators: name: Redaktion, Die
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
OPEN SOURCE INFORMATION AND LEARNING IN HIGHER EDUCATION USING SIMPLE AND FREE PLATFORMS
Creators: name: Kulkarni, Prajot
name: Shankargoud Patil
Publisher: name: Zenodo
Year: 2020
Subjects: Open source learning (OSL)
massive open online courses(MOOC)
STEM education

description: Internet is flooded with information, whenever a student or educator tries to find some information or notes online, its difficult to find the correct and proper content. The information available on some sites is not open or free to access. This paper discusses and aims in creating an open information platform related to the courses and subjects with a motto of OSL (open source learning) for higher education. Using internet as a tool for structuring and building a simple platform for storing data related to one’s courses and subjects, we can achieve the motto of open source information and learning for higher education system. The OSL (open source learning) platform can be handled by a mutually organised community under proper guidelines and instructions, allowing students, professors and STEM educators to use, reuse and rebuild the content for the repository. MOOCs (massive open online courses) can be added to this platform. This platform will be helpful for many students and STEM educators for creating more content for other students and will act as a repository. They can independently create videos, images and text, and add it to the platform with the communities permission. A proper structure to build a platform and guidelines are discussed in this paper.
description: This is the edited PDF format of the previous version.
Negative Human Rights as a Basis for Long-term AI Safety and Regulation
Creators: name: Bajgar, Ondrej
name: Horenovsky, Jan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computers and Society (cs.CY)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: If autonomous AI systems are to be reliably safe in novel situations, they will need to incorporate general principles guiding them to recognize and avoid harmful behaviours. Such principles may need to be supported by a binding system of regulation, which would need the underlying principles to be widely accepted. They should also be specific enough for technical implementation. Drawing inspiration from law, this article explains how negative human rights could fulfil the role of such principles and serve as a foundation both for an international regulatory system and for building technical safety constraints for future AI systems.
Analysis of integrin turnover in Drosophila myotendinous junctions
Creators: name: Yuan, Lin
Publisher: name: University of British Columbia
Year: 2011

description: Integrins are essential mediators of cell-ECM adhesion and they are, therefore, important to animal viability. Integrin-mediated transient (short-term) cell adhesion underlies dynamic processes such as cell migration while integrin-mediated stable (long-term) cell adhesion is essential for maintaining tissue architecture. Ongoing adhesion complex turnover is essential for transient cell adhesion, but it is unknown whether turnover is also required for maintenance of long-term adhesion. Fluorescence Recovery After Photobleaching (FRAP) was used to analyze the dynamics of the Integrin Adhesion Complex (IAC) in a model for long-term cell-ECM adhesion, Myotendinous Junctions (MTJs), in fly embryos and larvae. It was found that the IAC undergoes turnover in the MTJs and that this process is mediated by clathrin-dependent endocytosis but not lateral diffusion. Moreover, the small GTPase Rab5 can regulate the proportion of IAC components that undergo turnover and altering Rab5 activity weakened MTJs such that it leads to muscle attachment defects. In addition, growth of the MTJs was concomitant with a decrease in the proportion of IAC components undergoing turnover and it is possible that this growth-dependent decrease is regulated by the mechanical tension exerted on MTJs by muscle contraction. Experiments using mutations that result in increased mechanical tension exhibited lower IAC turnover. In contrast, mutations that lower mechanical tension exhibited higher IAC turnover with the exception of integrins. Therefore, we propose that IAC turnover is regulated during development by mechanical tension in long-term cell-ECM adhesions to allow normal tissue growth and maintenance.
Florivory by Cebus capucinus: How variation in food abundance and colour vision affect foraging strategies.
Creators: name: Hogan, Jeremy
Publisher: name: Arts
Year: 2015
Subjects: subject: Anthropology--Physical
subject: Ecology
subject: FOS: Biological sciences
subject: Cebus
subject: trichromacy
subject: florivory

description: Many primates consume flowers in small proportions annually but increase their use seasonally. Food used during “crunch” periods may exert selection pressure for traits that improve foraging efficiency. High quality foods are believed to select for detection and harvesting adaptations, including colour vision. This study was designed to determine what leads to flower consumption by white-faced capuchin monkeys, a species that has polymorphic colour vision and consumes flowers rarely, but in high proportions seasonally. I compared flower foraging behaviour to fruit, flower, and invertebrate abundance, and obtained nutritional and spectral reflectance data for all flower foods. Flowers were consumed in higher frequencies during periods of low invertebrate abundance. Flower foods are of relatively high nutritional quality, have chromatic properties predicted to be more visible to trichromats, and were consumed more frequently by trichromats, suggesting they may play a role in the evolution and maintenance of polymorphic colour vision.
Large-amplitude electron-acoustic solitons in a dusty plasma with kappa-distributed electrons
Creators: name: Saini, N. S.
name: Danehkar, A.
name: Hellberg, M. A.
name: Kourakis, I.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The Sagdeev pseudopotential method is used to investigate the occurrence and the dynamics of fully nonlinear electrostatic solitary structures in a plasma containing suprathermal hot electrons, in the presence of massive charged dust particles in the background. The soliton existence domain is delineated, and its parametric dependence on different physical parameters is clarified.
description: 3 pages, 1 figure, presented as a poster at the 6th International Conference on the Physics of Dusty Plasmas (ICPDP6), Garmisch-Partenkirchen, Germany, 2011
Titelei
Creators: name: Redaktion, Die
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Conquest, Identity, and Colonial Discourse in Medieval England: New Perspectives on Sir Gawain and the Green Knight and Patience
Creators: name: Carter, Jaclyn
Publisher: name: Graduate Studies
Year: 2015
Subjects: Literature--Medieval
Literature--English

description: Recent scholarship has introduced the possibility of literary analysis of medieval texts from the perspective of contemporary postcolonial theory. Although a burgeoning field in medieval studies, postcolonial medieval studies has been met with significant opposition from those scholars who feel it does a disservice to contemporary postcolonial studies and the events that warranted that field's creation. Nevertheless, aspects of conquest and foreign estrangement, and the building of national identity through political rhetoric and literary output, while illuminated by a postcolonial perspective, were just as present in medieval England as they were in recent times--for example in the colonial occupation of Wales. Using prominent theorists such as Stuart Hall and Homi Bhabha, and their theories of diaspora and hybridity, mimicry, and ambivalence respectively, this investigation analyses Sir Gawain and the Green Knight and Patience--two poems written in the late fourteenth century in the Welsh Marches--with postcolonial reading strategies.
Development of Innovative Hybrid Steel-Free Multi-Girder Bridge Deck System
Creators: name: Chen, Donna S-Min
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Engineering--Civil
subject: Hybrid
subject: FRP
subject: UHPC
subject: bond
subject: Finite Element
subject: steel-free bridge
subject: post-tension

description: The focus of this dissertation is the design and development of a functional three-dimensional steel-free multi-girder bridge deck system composed of longitudinal Glass Fibre Reinforced Polymer (GFRP) hollow box beam girders reinforced with Carbon FRP (CFRP) sheets on the bottom tensile face. An integrated cast-in-place Ultra-High Performance Concrete (UHPC) slab was placed overtop of the assembled girder system, with a two-part bond system used between the top flange of the GFRP hollow box beams and the UHPC slab. Transversely, a system of GFRP threaded rods was used as horizontal straps, horizontal post-tensioned GFRP rods as well as diagonal cross-bracing rods to provide transverse composite action between the adjacent girders. Small-scale experimental testing results led to the use of unbonded non-prestressed vertical GFRP threaded rod at the GFRP-UHPC interface in conjunction with an epoxy bonded coarse silica sand aggregate layer. Similarly, GFRP threaded rods post-tensioned to 2.5% of the ultimate strain capacity were used. Large-scale experimental testing of a quarter-scale bridge deck system specimen under service load conditions exhibited negligible signs of creep and stress relaxation when subjected to repeated loading. The performance of the bridge deck specimen under various concentric and eccentric wheel load configurations led to live load distribution factors of 25-30% for interior girders and up to 50% for outer girders. Experimental testing of the bridge deck specimen under ultimate load condition confirmed global pseudo-ductile behaviour in the system with good load transfer provided by the composite action systems. The governing areas of potential failure included cracking in the UHCP slab, tensile failure in the CFRP sheet and GFRP bottom flange, compressive buckling in the GFRP cross-bracing bars and anchorage failure in the post-tensioned GFRP rods. The developed three-dimensional finite element model was validated for global load-deflection behaviour as well as local performance in the main structural elements; however, it is not recommended for predictions of local strain in the horizontal and vertical GFRP threaded rods without additional model refinements. The work performed in this research program led to the development of a functional transverse composite action system containing solely GFRP material. The previously designed hybrid FRP-UHPC girders were successfully incorporated in a feasible multi-girder bridge deck system capable of effective three-dimensional load distribution between adjacent structural elements. The developed hybrid steel-free multi-girder bridge deck system exhibited the desired pseudo-ductile global behaviour and performed in accordance with ultimate and serviceability load requirements in the current Canadian code.