cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Passing Waves from Atomistic to Continuum
Creators: name: Chen, Xiang
name: Diaz, Adrian
name: Xiong, Liming
name: McDowell, David L.
name: Chen, Youping
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Progress in the development of coupled atomistic-continuum methods for simulations of critical dynamic material behavior has been hampered by a spurious wave reflection problem at the atomistic-continuum interface. This problem is mainly caused by the difference in material descriptions between the atomistic and continuum models, which results in a mismatch in phonon dispersion relations. In this work, we introduce a new method based on atomistic dynamics of lattice coupled with a concurrent atomistic-continuum method to enable a full phonon representation in the continuum description. This then permits the passage of short-wavelength, high-frequency phonon waves from the atomistic to continuum regions. The benchmark examples presented in this work demonstrate that the new scheme enables the passage of all allowable phonons through the atomistic-continuum interface; it also preserves the wave coherency and energy conservation after phonons transport across multiple atomistic-continuum interfaces. This work is the first step towards developing a concurrent atomistic-continuum simulation tool for non-equilibrium phonon-mediated thermal transport in materials with microstructural complexity.
Emergence of clusters: Halos, Efimov states, and experimental signals
Creators: name: Hove, D.
name: Garrido, E.
name: Sarriguren, P.
name: Fedorov, D. V.
name: Fynbo, H. O. U.
name: Jensen, A. S.
name: Zinner, N. T.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate emergence of halos and Efimov states in nuclei by use of a newly designed model which combines self-consistent mean-field and three-body descriptions. Recent interest in neutron heavy calcium isotopes makes $^{72}$Ca ($^{70}$Ca+n+n) an ideal realistic candidate on the neutron dripline, and we use it as a representative example that illustrates our broadly applicable conclusions. By smooth variation of the interactions we simulate the crossover from well-bound systems to structures beyond the threshold of binding, and find that halo-configurations emerge from the mean-field structure for three-body binding energy less than $\sim 100$keV. Strong evidence is provided that Efimov states cannot exist in nuclei. The structure that bears the most resemblance to an Efimov state is a giant halo extending beyond the neutron-core scattering length. We show that the observable large-distance decay properties of the wave function can differ substantially from the bulk part at short distances, and that this evolution can be traced with our combination of few- and many-body formalisms. This connection is vital for interpretation of measurements such as those where an initial state is populated in a reaction or by a beta-decay.
description: 5 pages, 5 figures, under review
Cosmic strings and other topological defects in nonscaling regimes
Creators: name: Azevedo, R. P. L.
name: Martins, C. J. A. P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Cosmic strings are topological defects possibly formed in the early Universe, which may be observable due to their gravitational effects on the cosmic microwave background radiation or gravitational wave experiments. To this effect it is important to quantitatively ascertain the network properties, including their density, velocity or the number of strings present, at the various epochs in the observable Universe. Attempts to estimate these numbers often rely on simplistic approximations for the string parameters, such as assuming that the network is scaling. However, in cosmological models containing realistic amounts of radiation, matter and dark energy a string network is never exactly scaling. Here we use the velocity-dependent one-scale model for the evolution of a string network to better quantify how these networks evolve. In particular we obtain new approximate analytic solutions for the behavior of the network during the radiation-to-matter and matter-to-acceleration transitions (assuming, in the latter case, the canonical $Λ$ cold dark matter model), and numerically calculate the relevant quantities for a range of possible dark energy models.
description: 10 pages, 5 figures
Mimetic gravity: a review of recent developments and applications to cosmology and astrophysics
Creators: name: Sebastiani, L.
name: Vagnozzi, S.
name: Myrzakulov, R.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Mimetic gravity is a Weyl-symmetric extension of General Relativity, related to the latter by a singular disformal transformation, wherein the appearance of a dust-like perfect fluid can mimic cold dark matter at a cosmological level. Within this framework, it is possible to provide an unified geometrical explanation for dark matter, the late-time acceleration, and inflation, making it a very attractive theory. In this review, we summarize the main aspects of mimetic gravity, as well as extensions of the minimal formulation of the model. We devote particular focus to the reconstruction technique, which allows the realization of any desired expansionary history of the Universe by an accurate choice of potential, or other functions defined within the theory (as in the case of mimetic $f(R)$ gravity). We briefly discuss cosmological perturbation theory within mimetic gravity. As a case study within which we apply the concepts previously discussed, we study a mimetic Hořava-like theory, of which we explore solutions and cosmological perturbations in detail. Finally, we conclude the review by discussing static spherically symmetric solutions within mimetic gravity, and apply our findings to the problem of galactic rotation curves. Our review provides an introduction to mimetic gravity, as well as a concise but self-contained summary of recent findings, progresses, open questions, and outlooks on future research directions.
description: 68 pages, invited review to appear in Advances in High Energy Physics
Closed formulas and identities on the Bell polynomials and falling factorials
Creators: name: Qi, Feng
name: Niu, Da-Wei
name: Lim, Dongkyu
name: Guo, Bai-Ni
Publisher: name: Contributions to Discrete Mathematics
Year: 2020

description: Contributions to Discrete Mathematics, Vol. 15 No. 1 (2020)
Composite Reflective/Absorptive IR-Blocking Filters Embedded in Metamaterial Antireflection Coated Silicon
Creators: name: Munson, C. D.
name: Choi, S. K.
name: Coughlin, K. P.
name: McMahon, J. J.
name: Miller, K. H.
name: Page, L. A.
name: Wollack, E. J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Infrared (IR) blocking filters are crucial for controlling the radiative loading on cryogenic systems and for optimizing the sensitivity of bolometric detectors in the far-IR. We present a new IR filter approach based on a combination of patterned frequency selective structures on silicon and a thin (50 $μ\textrm{m}$ thick) absorptive composite based on powdered reststrahlen absorbing materials. For a 300 K blackbody, this combination reflects $\sim$50\% of the incoming light and blocks \textgreater 99.8\% of the total power with negligible thermal gradients and excellent low frequency transmission. This allows for a reduction in the IR thermal loading to negligible levels in a single cold filter. These composite filters are fabricated on silicon substrates which provide excellent thermal transport laterally through the filter and ensure that the entire area of the absorptive filter stays near the bath temperature. A metamaterial antireflection coating cut into these substrates reduces in-band reflections to below 1\%, and the in-band absorption of the powder mix is below 1\% for signal bands below 750 GHz. This type of filter can be directly incorporated into silicon refractive optical elements.
3-uniform hypergraphs: modular decomposition and realization by tournaments
Creators: name: Boussairi, Abderrahim
name: Chergui, Brahim
name: Ille, Pierre
name: Zaidi, Mohamed
Publisher: name: Contributions to Discrete Mathematics
Year: 2020

description: Contributions to Discrete Mathematics, Vol. 15 No. 1 (2020)
Towards Impedance Characterization of Carbon-Carbon Ultrasonically Absorptive Cavities via the Inverse Helmholtz Problem
Creators: name: Patel, Danish
name: Gupta, Prateek
name: Scalo, Carlo
name: Rothermel, Thomas
name: Kuhn, Markus
Publisher: name: arXiv
Year: 2017
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Numerical Analysis (math.NA)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We present a numerical method to determine the complex acoustic impedance at the open surface of an arbitrarily shaped cavity, associated to an impinging planar acoustic wave with a given wavenumber vector and frequency. We have achieved this by developing the first inverse Helmholtz Solver (iHS), which implicitly reconstructs the complex acoustic waveform--at a given frequency--up to the unknown impedance boundary, hereby providing the spatial distribution of impedance as a result of the calculation for that given frequency. We show that the algebraic closure conditions required by the inverse Helmholtz problem are physically related to the assignment of the spatial distribution of the pressure phase over the unknown impedance boundary. The iHS is embarrassingly parallelizable over the frequency domain allowing for the straightforward determination of the full broadband impedance at every point of the target boundary. In this paper, we restrict our analysis to two-dimensions only. We first validate our results against Rott's quasi one-dimensional thermoacoustic theory for viscid and inviscid constant-area rectangular ducts, test our iHS in a fully unstructured fashion with a geometrically complex cavity, and finally, present a simplified, two-dimensional analysis of a sample of carbon-carbon ultrasonically absorptive coatings (C/C UACs) manufactured in DLR-Stuttgart, and used in the hypersonic transition delay experiments by Wagner et al. in AIAA 2012-5865. The final goal is to model C/C UACs with multi-oscillator Time Domain Impedance Boundary Conditions (TDIBC) developed by Lin et al. in JFM (2016) to be applied in direct numerical simulations (DNS) focused on the overlying boundary layer, eliminating the need to simultaneously resolve the microscopic porous structure of the C/C UACs.
description: As submitted to AIAA SciTech 2017, available at http://arc.aiaa.org/doi/pdf/10.2514/6.2017-0460
Characterization and control of charge transfer in a tunnel junction
Creators: name: Gabelli, Julien
name: Thibault, Karl
name: Gasse, Gabriel
name: Lupien, Christian
name: Reulet, Bertrand
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Charge transfer in a tunnel junction is studied under dc and ac voltage bias using quantum shot noise. Under dc voltage bias $V$, spectral density of noise measured within a very large bandwidth enables to deduce the current-current correlator in the time domain by Fourier transform. This correlator exhibits regular oscillations proving that electrons try to cross the junction regularly, every $h/eV$. Using harmonic and bi-harmonic ac voltage bias, we then show that quasiparticles excitations can be transferred through the junction in a controlled way. By measuring the reduction of the excess shot noise, we are able to determine the number of electron-hole pairs surrounding the injected electrons and demonstrate that bi-harmonic voltage pulses realize an on-demand electron source with a very small admixture of electron-hole pairs.
description: 8 pages, 8 figures
Response to the Comment on "Paradox of Photons Disconnected Trajectories Being Located by Means of "Weak Measurements" in the Nested Mach-Zehnder Interferometer" (JETP Letters 105, 152 (2017))
Creators: name: Nikolaev, Gennady N.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In [JETP Lett. 105(3), 152 (2017)], a clear and comprehensive analysis of the paradoxical results of experiment [Phys. Rev. Lett. 111, 240402 (2013)] was carried out on the basis of the classical wave theory of light, which presupposes the continuity of possible of light paths. It was shown that the paradoxical results of the experiment are due not to the discontinuity of the trajectories of light, as claimed in [Phys. Rev. Lett. 111, 240402 (2013)], but to the used way of detecting the path of photons. The experiment modification proposed in [JETP Lett. 105(3), 152 (2017)] allows us to eliminate the seeming discontinuity of the light trajectories. In Comment [arXiv:1705.02137 (2017)] to the article such modification is declared unreasonable. This Response to the Comment shows that this statement is not based on clear and logical arguments. Instead, it is only asserted that the proposed modification "violates the faithfulness indication of the trace" of photons. Therefore, the Comment's criticism can not be considered as well-founded. Consequently, the conclusion of [JETP Lett. 105(3), 152 (2017)] that a new concept of disconnected trajectories proposed by the authors of work [Phys. Rev. Lett. 111, 240402 (2013)] is unnecessary, remains valid.
FLRW Cosmology with Horava-Lifshitz Gravity: Impacts of Equations of State
Creators: name: Tawfik, A.
name: Dahab, E. Abou El
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Inspired by Lifshitz theory for quantum critical phenomena in condensed matter, Horava proposed a theory for quantum gravity with an anisotropic scaling in ultraviolet. In Horava-Lifshitz gravity (HLG), we have studied the impacts of six types of equations of state on the evolution of various cosmological parameters such as Hubble parameters and scale factor. From the comparison of the general relativity gravity with the HLG with detailed and without with non-detailed balance conditions, remarkable differences are found. Also, a noticeable dependence of singular and non-singular Big Bang on the equations of state is observed. We conclude that HLG explains various epochs in the early universe and might be able to reproduce the entire cosmic history with and without singular Big Bang.
description: 20 pages, 3 figures, accepted for publication in Int. J. Theor. Phys
Corrigendum to ``"On the enumeration of a class of toroidal graphs" [Contrib. Discrete Math. 13 (2018), no. 1, 79-119]
Creators: name: Maity, Dipendu
name: Upadhyay, Ashish Kumar
Publisher: name: Contributions to Discrete Mathematics
Year: 2020

description: Contributions to Discrete Mathematics, Vol. 15 No. 1 (2020)
On the Multi-User, Multi-Cell Massive Spatial Modulation Uplink: How Many Antennas for Each User?
Creators: name: He, Longzhuang
name: Wang, Jintao
name: Song, Jian
name: Hanzo, Lajos
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Massive spatial modulation aided multiple-input multiple-output (SM-MIMO) systems have recently been proposed as a novel combination of spatial modulation (SM) and of conventional massive MIMO, where the base station (BS) is equipped with a large number of antennas and simultaneously serves multiple user equipment (UE) that employ SM for their uplink transmission. Since the massive SM-MIMO concept combines the benefits of both the SM and massive MIMO techniques, it has recently attracted substantial research interest. In this paper, we study the achievable uplink spectral efficiency (SE) of a multi-cell massive SM-MIMO system, and derive closed-form expressions to asymptotically lower-bound the SE yielded by two linear BS combining schemes, including maximum ratio (MR) combining and zero forcing (ZF) combining, when a sufficiently large number of BS antennas are equipped. The derivation takes into account the impact of transmitter spatial correlations, of imperfect channel estimations, of user-specific power controls and of different pilot reuse factors. The proposed asymptotic bounds are shown to be tight, even when the scale of BS antennas is limited. The new SE results facilitate a system-level investigation of the optimal number of uplink transmit antennas (TAs) $N$ with respect to SE maximization. Explicitly, we provide theoretical insights on the SE of massive SM-MIMO systems. Furthermore, we demonstrate that massive SM-MIMO systems are capable of outperforming the SE of conventional massive MIMOs relying on single-TA UEs.
A spallation-based neutron target for direct studies of neutron-induced reactions in inverse kinematics
Creators: name: Reifarth, René
name: Göbel, Kathrin
name: Heftrich, Tanja
name: Weigand, Mario
name: Jurado, Beatriz
name: Käppeler, Franz
name: Litvinov, Yuri A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Nuclear Experiment (nucl-ex)
subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: We discuss the possibility to build a neutron target for nuclear reaction studies in inverse kinematics utilizing a storage ring and radioactive ion beams. The proposed neutron target is a specially designed spallation target surrounded by a large moderator of heavy water (D$_2$O). We present the resulting neutron spectra and their properties as a target. We discuss possible realizations at different experimental facilities.
description: 10 pages, 12 figures
MP2-F12 Basis Set Convergence for the S66 Noncovalent Interactions Benchmark: Transferability of the Complementary Auxiliary Basis Set (CABS)
Creators: name: Sylvetsky, Nitai
name: Kesharwani, Manoj Kumar
name: Martin, Jan M. L.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Complementary auxiliary basis sets for F12 explicitly correlated calculations appear to be more transferable between orbital basis sets than has been generally assumed. We also find that aVnZ-F12 basis sets, originally developed with anionic systems in mind, appear to be superior for noncovalent interactions as well, and propose a suitable CABS sequence for them.
description: AIP Conference Proceedings, in press (ICCMSE-2017 proceedings), 4 pages
Barjols, vallon des Carmes, gouffre aux Epines
Creators: name: Musée National Des Arts Et Traditions Populaires (Paris)
name: Centre D'ethnologie Française
Publisher: name: École des Hautes Études en Sciences Sociales; Institut  interdisciplinaire d'anthropologie du contemporain (Paris); Laboratoire d'anthropologie et d'histoire de l'institution de la culture (Paris)
Year: 2024

Abstract
Estimating Extinction using Unsupervised Machine Learning
Creators: name: Meingast, Stefan
name: Lombardi, Marco
name: Alves, Joao
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Dust extinction is the most robust tracer of the gas distribution in the interstellar medium, but measuring extinction is limited by the systematic uncertainties involved in estimating the intrinsic colors to background stars. In this paper we present a new technique, PNICER, that estimates intrinsic colors and extinction for individual stars using unsupervised machine learning algorithms. This new method aims to be free from any priors with respect to the column density and intrinsic color distribution. It is applicable to any combination of parameters and works in arbitrary numbers of dimensions. Furthermore, it is not restricted to color space. Extinction towards single sources is determined by fitting Gaussian Mixture Models along the extinction vector to (extinction-free) control field observations. In this way it becomes possible to describe the extinction for observed sources with probability densities. PNICER effectively eliminates known biases found in similar methods and outperforms them in cases of deep observational data where the number of background galaxies is significant, or when a large number of parameters is used to break degeneracies in the intrinsic color distributions. This new method remains computationally competitive, making it possible to correctly de-redden millions of sources within a matter of seconds. With the ever-increasing number of large-scale high-sensitivity imaging surveys, PNICER offers a fast and reliable way to efficiently calculate extinction for arbitrary parameter combinations without prior information on source characteristics. PNICER also offers access to the well-established NICER technique in a simple unified interface and is capable of building extinction maps including the NICEST correction for cloud substructure. PNICER is offered to the community as an open-source software solution and is entirely written in Python.
description: Accepted for publication in A&A, source code available at http://smeingast.github.io/PNICER/
Novel bonding patterns and optoelectronic properties of the two-dimensional Si$_x$C$_y$ monolayers
Creators: name: Fan, Dong
name: Lu, Shaohua
name: Guo, Yundong
name: Hu, Xiaojun
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The search of new two-dimensional (2D) materials with novel optical and electronic properties is always desirable for material development. Here, we report a comprehensive theoretical prediction of 2D SiC compounds with different stoichiometries from C-rich to Si-rich. Besides the previously known hexagonal SiC sheet, we identified two types of hitherto-unknown structural motifs with distinctive bonding features. The first type of 2D SiC monolayer, including t-SiC and t-Si$_2$C sheet, can be described by tetragonal lattice. Among them,t-SiC monolayer sheet is featured by each carbon atom binds with four neighboring silicon atoms in almost the same plane, constituting a quasi-planar four-coordinated rectangular moiety. More interestingly, our calculations demonstrate that this structure exhibits a strain-dependent insulator-semimetal transition, suggesting promising applications in strain-dependent optoelectronic sensors. The second type of 2D SiC sheet is featured by silagraphyne with acetylenic linkages(-C$\equiv$C-). Silagraphyne shows both high pore sizes and Poisson's ratio. These properties make them a potentially important material for applications in separation membranes and catalysis. Moreover, one of the proposed structures, $γ$-silagraphyne, is a direct-band-gap semiconductor with a bandgap of 0.89 eV, which has a strong absorption peak in the visible-light region, giving a promising application in ultra-thin transistors, optical sensor devices and solar cell devices.
description: 7 pages, 6 figures
The local distinguishability of any three generalized Bell states
Creators: name: Wang, Yan-Ling
name: Li, Mao-Sheng
name: Fei, Shao-Ming
name: Zheng, Zhu-Jun
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the problem of distinguishing maximally entangled quantum states by using local operations and classical communication (LOCC). A question of fundamental interest is whether any three maximally entangled states in $\mathbb{C}^d\otimes\mathbb{C}^d (d\geq 4)$ are distinguishable by LOCC. In this paper, we restrict ourselves to consider the generalized Bell states. And we prove that any three generalized Bell states in $\mathbb{C}^d\otimes\mathbb{C}^d (d\geq 4)$ are locally distinguishable.
description: 11 pages, 1 figure, accepted by Quantum Information Processing
Evidence from K2 for rapid rotation in the descendant of an intermediate-mass star
Creators: name: Hermes, J. J.
name: Kawaler, Steven D.
name: Romero, A. D.
name: Kepler, S. O.
name: Tremblay, P. -E.
name: Bell, Keaton J.
name: Dunlap, B. H.
name: Montgomery, M. H.
name: Gaensicke, B. T.
name: Clemens, J. C.
name: Dennihy, E.
name: Redfield, S.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Using patterns in the oscillation frequencies of a white dwarf observed by K2, we have measured the fastest rotation rate, 1.13(02) hr, of any isolated pulsating white dwarf known to date. Balmer-line fits to follow-up spectroscopy from the SOAR telescope show that the star (SDSSJ0837+1856, EPIC 211914185) is a 13,590(340) K, 0.87(03) solar-mass white dwarf. This is the highest mass measured for any pulsating white dwarf with known rotation, suggesting a possible link between high mass and fast rotation. If it is the product of single-star evolution, its progenitor was a roughly 4.0 solar-mass main-sequence B star; we know very little about the angular momentum evolution of such intermediate-mass stars. We explore the possibility that this rapidly rotating white dwarf is the byproduct of a binary merger, which we conclude is unlikely given the pulsation periods observed.
description: 5 pages, 4 figure, 1 table; accepted for publication in The Astrophysical Journal Letters
Uma Abordagem Holística da Segurança da Informação: Conscientização, Políticas e Práticas
Creators: name: , Ricardo
Publisher: name: Zenodo
Year: 2023
Subjects: segurança da informação, abordagem holística, conscientização dos colaboradores, políticas de segurança, gestão de riscos, resposta a incidentes, colaboração.

description: Este artigo técnico aborda a importância de uma abordagem holística da segurança da informação, destacando a conscientização dos colaboradores, a implementação de políticas claras e as práticas adequadas para proteger as organizações contra ameaças cibernéticas. Explorando os elementos essenciais da segurança da informação, como gestão de riscos, resposta a incidentes e colaboração, o artigo busca fornecer insights valiosos sobre como fortalecer a postura de segurança de uma organização.
Scalar Fields in Black Hole Spacetimes
Creators: name: Thuestad, Izak
name: Khanna, Gaurav
name: Price, Richard
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The time-evolution of matter fields in black hole exterior spacetimes is a well-studied subject, spanning several decades of research. However, the behavior of fields in the black hole interior spacetime, has only relatively recently begun receiving some attention from the research community. In this paper, we numerically study the late-time evolution of scalar fields in both Schwarzschild and Kerr spacetimes, including the black hole interior. We recover the expected late-time power-law "tails" on the exterior (null infinity, time-like infinity and the horizon). In the interior region, we find an interesting oscillatory behavior that is characterized by the multipole index $\ell$ of the scalar field. In addition, we also study the extremal Kerr case and find strong indications of an instability developing at the horizon.
description: 9 pages, 10 figures; updated references
Non-Renormalization For Non-Supersymmetric Black Holes
Creators: name: Charles, Anthony M.
name: Larsen, Finn
name: Mayerson, Daniel R.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We analyze large logarithmic corrections to 4D black hole entropy and relate them to the Weyl anomaly. We use duality to show that counter-terms in Einstein-Maxwell theory can be expressed in terms of geometry alone, with no dependence on matter terms. We analyze the two known $\mathcal{N} = 2$ supersymmetric invariants for various non-supersymmetric black holes and find that both reduce to the Euler invariant. The $c$-anomaly therefore vanishes in these theories and the coefficient of the large logarithms becomes topological. It is therefore independent of continuous black hole parameters, such as the mass, even far from extremality.
description: 29 pages + appendices, 3 tables
A Hybrid Both Filter and Wrapper Feature Selection Method for Microarray Classification
Creators: name: Chuang, Li-Yeh
name: Ke, Chao-Hsuan
name: Yang, Cheng-Hong
Publisher: name: arXiv
Year: 2016
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Gene expression data is widely used in disease analysis and cancer diagnosis. However, since gene expression data could contain thousands of genes simultaneously, successful microarray classification is rather difficult. Feature selection is an important pre-treatment for any classification process. Selecting a useful gene subset as a classifier not only decreases the computational time and cost, but also increases classification accuracy. In this study, we applied the information gain method as a filter approach, and an improved binary particle swarm optimization as a wrapper approach to implement feature selection; selected gene subsets were used to evaluate the performance of classification. Experimental results show that by employing the proposed method fewer gene subsets needed to be selected and better classification accuracy could be obtained.
description: 5 pages, 2 figures, 4tables
Collisions of Terrestrial Worlds: The Occurrence of Extreme Mid-Infrared Excesses around Low-Mass Field Stars
Creators: name: Theissen, Christopher
name: West, Andrew
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the results of an investigation into the occurrence and properties (stellar age and mass trends) of low-mass field stars exhibiting extreme mid-infrared (MIR) excesses ($L_\mathrm{IR} / L_\ast \gtrsim 0.01$). Stars for the analysis were initially selected from the Motion Verified Red Stars (MoVeRS) catalog of photometric stars with SDSS, 2MASS, and $WISE$ photometry and significant proper motions. We identify 584 stars exhibiting extreme MIR excesses, selected based on an empirical relationship for main sequence $W1-W3$ colors. For a small subset of the sample, we show, using spectroscopic tracers of stellar age (H$α$ and Li ${\rm{\small I}}$) and luminosity class, that the parent sample is likely comprised of field dwarfs ($\gtrsim$ 1 Gyr). We also develop the Low-mass Kinematics ($LoKi$) galactic model to estimate the completeness of the extreme MIR excess sample. Using Galactic height as a proxy for stellar age, the completeness corrected analysis indicates a distinct age dependence for field stars exhibiting extreme MIR excesses. We also find a trend with stellar mass (using $r-z$ color as a proxy). Our findings are consistent with the detected extreme MIR excesses originating from dust created in a short-lived collisional cascade ($\lesssim$ 100,000 years) during a giant impact between two large planetismals or terrestrial planets. These stars with extreme MIR excesses also provide support for planetary collisions being the dominant mechanism in creating the observed $Kepler$ dichotomy (the need for more than a single mode, typically two, to explain the variety of planetary system architectures $Kepler$ has observed), rather than different formation mechanisms.
description: 33 pages, 26 figures, 10 tables. Accepted for publication in AJ
X Marks the Spot: Nexus of Filaments, Cores, and Outflows in a Young Star-Forming Region
Creators: name: Imara, Nia
name: Lada, Charles
name: Lewis, John
name: Bieging, John H.
name: Kong, Shuo
name: Lombardi, Marco
name: Alves, Joao
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a multiwavelength investigation of a region of a nearby giant molecular cloud that is distinguished by a minimal level of star formation activity. With our new 12CO(J=2-1) and 13CO(J=2-1) observations of a remote region within the middle of the California molecular cloud, we aim to investigate the relationship between filaments, cores, and a molecular outflow in a relatively pristine environment. An extinction map of the region from Herschel Space Observatory observations reveals the presence of two 2-pc-long filaments radiating from a high-extinction clump. Using the 13CO observations, we show that the filaments have coherent velocity gradients and that their mass-per-unit-lengths may exceed the critical value above which filaments are gravitationally unstable. The region exhibits structure with eight cores, at least one of which is a starless, prestellar core. We identify a low-velocity, low-mass molecular outflow that may be driven by a flat spectrum protostar. The outflow does not appear to be responsible for driving the turbulence in the core with which it is associated, nor does it provide significant support against gravitational collapse.
description: Accepted for publication in the Astrophysical Journal
Buste de saint-Marcel sculpté par l'abbé César Sumien
Creators: name: Musée National Des Arts Et Traditions Populaires (Paris)
name: Centre D'ethnologie Française
Publisher: name: École des Hautes Études en Sciences Sociales; Institut  interdisciplinaire d'anthropologie du contemporain (Paris); Laboratoire d'anthropologie et d'histoire de l'institution de la culture (Paris)
Year: 2024

Abstract
Barjols, pré de foire, petit oratoire de saint Marcel derrière un mur de clôture
Creators: name: Musée National Des Arts Et Traditions Populaires (Paris)
name: Centre D'ethnologie Française
Publisher: name: École des Hautes Études en Sciences Sociales; Institut  interdisciplinaire d'anthropologie du contemporain (Paris); Laboratoire d'anthropologie et d'histoire de l'institution de la culture (Paris)
Year: 2024

Abstract
title: Evaluating the efficacy of oxytocin for pain management: an updated systematic review and meta-analysis
Creators: name: Mekhael, Anastasia
Publisher: name: Memorial University of Newfoundland
Year: 2022

description: Currently available treatments for chronic pain rarely result in full recovery, indicating the need for an analgesic that is non-addictive and effective. Oxytocin has recently gained attention for its potential analgesic properties. We searched Ovid MEDLINE®, Embase, PsycINFO and CINAHL (from January 2012 to February 2022) and the Clinicaltrials.gov website. Studies from 1950- 2012 were included from our published review (Rash et al., 2014). Comprehensive Meta-Analysis software was used where three or more studies reported on the same outcome. Narrative synthesis was performed for outcomes with less than three studies by calculating individual effect sizes. Searches returned 2,087 unique citations, 8 of which met inclusion criteria. 6 studies were included from Rash et al. (2014; N= 1,504). Three metaanalyses were conducted to evaluate the effect of exogenous oxytocin on pain, the association between endogenous oxytocin and self-reported pain ratings and the effect of exogenous oxytocin on self-reported depression. The effect of exogenous oxytocin on acute pain and emotional function, and the association between endogenous oxytocin and self-reported anxiety were narratively reviewed. There was a trend favouring oxytocin as an analgesic despite nonsignificant meta-analysis. Results from meta-analysis and narrative review were mixed and highlighted potential sex differences but heterogeneity in the included studies precludes definitive conclusions from being drawn. Future studies are imperative and should undertake more precise exploration of mechanisms of analgesic action to clarify inconsistency in the existing body of literature.
[Halle (Saale), Universitäts- und Landesbibliothek Sachsen-Anhalt, Morbio 15 (12)]
Creators: name: (:Unkn) Unknown
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 1293
Subjects: subject: Papsturkunde
subject: Urkunde
subject: 090

description: Auszüge aus Papsturkunden
Full-order optimal compensators for flow control: the multi-input case
Creators: name: Semeraro, Onofrio
name: Pralits, Jan Oscar
Publisher: name: arXiv
Year: 2017
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Flow control has been the subject of numerous experimental and theoretical works. In this numerical study, we analyse full-order, optimal controllers for large dynamical systems in presence of multiple actuators and sensors. We start from the original technique proposed by Bewley et al. (2016), the adjoint of the direct-adjoint (ADA) algorithm. The algorithm is iterative and allows bypassing the solution of the algebraic Riccati equation associated with the optimal control problems, typically unfeasible for large systems. We extend ADA into a more generalized framework that includes the design of multi-input, coupled controllers and robust controllers based on the H_{\infty} framework. The full-order controllers do not require any preliminary step of model reduction or low-order approximation: this feature allows to pre-assess the optimal performances of an actuated flow without relying on any estimation process or further hypothesis. We show that the algorithm outperforms analogous technique, in terms of convergence performances considering two numerical cases: a distributed system and the linearized Kuramoto-Sivashinsky equation, mimicking a full three-dimensional control setup. For the ADA algorithm we find excellent scalability with the number of inputs (actuators) in terms of convergence to the solution, making the method a viable way for full-order controller design in complex settings.
The X-ray properties of z$\sim$6 luminous quasars
Creators: name: Nanni, R.
name: Vignali, C.
name: Gilli, R.
name: Moretti, A.
name: Brandt, W. N.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a systematic analysis of X-ray archival data of all the 29 quasars (QSOs) at $z$ > 5.5 observed so far with Chandra, XMM-Newton and Swift-XRT, including the most-distant quasar ever discovered, ULAS J1120+0641 ($z$ = 7.08). This study allows us to place constraints on the mean spectral properties of the primordial population of luminous Type 1 (unobscured) quasars. Eighteen quasars are detected in the X-ray band, and we provide spectral-fitting results for their X-ray properties, while for the others we provide upper limits to their soft (0.5-2.0 keV) X-ray flux. We measured the power-law photon index and derived an upper limit to the column density for the five quasars (J1306+0356, J0100+2802, J1030+0524, J1148+5251, J1120+0641) with the best spectra (> 30 net counts in the 0.5-7.0 keV energy range) and find that they are consistent with values from the literature and lower-redshift quasars. By stacking the spectra of ten quasars detected by Chandra in the redshift range 5.7 $\le$ $z$ $\le$ 6.1 we find a mean X-ray power-law photon index of $Γ= 1.92_{-0.27}^{+0.28}$ and a neutral intrinsic absorption column density of $N_H \le 10^{23}$ cm$^{-2}$. These results suggest that the X-ray spectral properties of luminous quasars have not evolved up to $z$ $\approx$ 6. We also derived the optical-X-ray spectral slopes ($α_{ox}$) of our sample and combined them with those of previous works, confirming that $α_{ox}$ strongly correlates with UV monochromatic luminosity at 2500 Å. These results strengthen the non-evolutionary scenario for the spectral properties of luminous active galactic nuclei (AGN).
description: 12 pages, 7 figures, accepted for publication in Astronomy and Astrophysics
STRAIN-MEDIATED MAGNETO ELECTRIC COUPLING AND BEYOND: CASE STUDIES BY IN-OPERANDO SPECTROSCOPY
Creators: name: MOTTI, FEDERICO
Publisher: name: Universit� degli Studi di Milano
Year: 2019

description: The work presented in this thesis addresses the Electrical control of Magnetism. Its implementation in multiferroic heterostructures may provide an ideal solution to efficiently manipulate magnetism at the nanoscale. In-operando spectroscopic techniques, in which electric and magnetic field can be applied on the sample during the experiment, are a powerful tool to understand the different mechanisms at the origin of magneto-electric coupling in multiferroic heterostructures. In this thesis X-ray Magnetic Circular Dichroism (XMCD), Magneto Optical Kerr Effect (MOKE) and related techniques were employed in in-operando experiments to investigate two prototypical systems composed by ferromagnetic thin films deposited on ferroelectric crystals. In the first one ultrathin La0.65Sr0.35MnO3 (LSMO) films were deposited epitaxially on BaTiO3 (BTO) ferroelectric substrates. It was shown that magnetic phase transitions are induced in LSMO both by variations in temperature, corresponding to structural transitions of BTO, and also by applied electric field, which results in ferroelectric domain rotations in BTO. The results can be explained comprehensively in terms of strain, which tunes the competition between ferro- and antiferro-magnetic interactions in manganites. The second one concerns metallic Fe deposited on 60% PbMg1/3Nb2/3O3 - 40% PbTiO3 (PMN-PT) substrates. Local variations of the magnetic anisotropy, fully reversible, are observed when the ferroelectric polarization of PMN-PT is switched between opposite directions out-of-plane. Correspondingly, surface cracks appear and disappear reversibly on the surface of the sample. The relation between these morphological and magnetic modifications is discussed. These results elude interpretations based on the most common mechanisms for magneto-electric coupling, suggesting that morphology could be considered as a new ingredient for electrical control of magnetism.
Emergence of Multi-Scaling in a Random Force-Stirred Fluid
Creators: name: Yakhot, Victor
name: Donzis, Diego
Publisher: name: arXiv
Year: 2017
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We consider transition to strong turbulence in an infinite fluid stirred by a gaussian random force. The transition is {\bf defined} as a first appearance of anomalous scaling of normalized moments of velocity derivatives (dissipation rates) emerging from the low-Reynolds-number Gaussian background. It is shown that due to multi-scaling, strongly intermittent rare events can be quantitatively described in terms of an infinite number of different "Reynolds numbers" reflecting multitude of anomalous scaling exponents. The theoretically predicted transition disappears at $R_λ\leq 3$. The developed theory, is in a quantitative agreement with the outcome of large-scale numerical simulations.
description: 5 pages two figures
An Open Software Development-based Ecosystem of R Packages for Proteomics Data Analysis
Creators: name: Gatto, Laurent
name: Vanderaa, Christophe
name: Gibb, Sebastian
name: Rainer, Johannes
Publisher: name: Zenodo
Year: 2024
Subjects: Mass Spectrometry
Proteomics
Open Software Development
R for Mass Spectrometry
Singe-cell Proteomics

description: A frequent problem with scientific research software is the lack of support, maintenance and further development. In particular, development by a single researcher can easily result in orphaned and dysfunctional software packages, especially if combined with poor documentation, missing unit tests or lack of adherence to open software development standards.

The RforMassSpectrometry  initiative aims to develop an efficient, scalable, and stable infrastructure for mass spectrometry (MS) based proteomics (Gatto et al. poster) and metabolomics (Rainer et al. poster) data analysis. As part of this initiative, a growing ecosystem of R software packages is being developed covering different aspects of metabolomics and proteomics data analysis. To avoid the aforementioned problems, community contributions are fostered, and open development, documentation and long-term support emphasised.

At the heart of the package ecosystem lies the Spectra package that provides the core infrastructure to handle, process and visualise MS data. Its design allows easy expansion to support existing and new file or data formats, including data representations with minimal memory footprint or remote data access. For proteomics data analysis, two packages in particular are dedicated to the analysis or quantitative and identification data. The PSMatch package handles and manages peptide identification data. It also provides functions to model and visualise peptide-protein relations to make informed decision about shared peptide filtering. The package also provides functions to calculate and visualise MS2 fragment ions, in conjunction with the Spectra package. The QFeatures package is the working horse for quantitative proteomics data. It builds on the familiar SummarizedExperiment and MultiAssayExperiment infrastructure and provides a familiar Bioconductor user experience to manage bulk and single-cell quantitative data across different assay levels (such as peptide spectrum matches, peptides and proteins) in a coherent and tractable way. These three packages rely on MsCoreUtils for efficient implementations of commonly used algorithms, designed to be re-used by other R packages.

In contrast to a monolithic software design, the RforMassSpectrometry ecosystem enables to build customised, modular, and reproducible analysis workflows. Future proteomics-related development will focus on improved data structures and analysis methods, better support for third-party data import, and better interoperability with other open source software including a direct integration with Python MS libraries.
Lipids and Mass Spectrometry Application
Creators: name: SPEZZANO, ROBERTO
Publisher: name: Universit� degli Studi di Milano
Year: 2019

description: During my PhD courses I focused attention on the applications of mass spectrometry in lipidomic studies. I applied mass spectrometry in several experimental models to try to observe differences in selected metabolites affected by a particular pathology. The first project performed in experimental model of impaird lipogenesis highlighted a cross talk between altered fatty acid synthesis and neuroactive steroid levels. The second project, mass spectrometry application allows to understand he effect of short-term diabetes on cholesterol metabolism. In the last project lipidomic pattern was investigated in experimental model of SCA38. Results obtained highlighted as elovl5 mutation affect phospholipids profile.