cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Deciphering the Rotational Spectrum of the First Excited Torsional State of Propylene Oxide
Creators: name: Stahl, Pascal
name: Arenas, Benjamin E.
name: Zingsheim, Oliver
name: Schnell, Melanie
name: Margulès, Laurent
name: Motiyenko, Roman A.
name: Fuchs, Guido W.
name: Giesen, Thomas F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The first excited torsional state of the chiral molecule propylene oxide, $\mathrm{CH_{3}C_{2}H_{3}O}$, is investigated from millimeter up to sub-millimeter wavelengths (75-950 GHz). The first excited vibrational mode of propylene oxide, $\upsilon_{24}$, is analysed using the programs ERHAM and XIAM. Rotational constants and tunneling parameters are provided, and a description of the A-E splittings due to internal rotation is given. Furthermore, the potential barrier height to internal rotation $V_{3}$ is determined to be $V_{3} = 894.5079(259) \mathrm{cm^{-1}}$ . Our results are compared with quantum chemical calculations and literature values. We present a line list of the dense spectrum of the first excited torsional state of propylene oxide in the (sub-)millimeter range. Our results will be useful for further studies of chiral molecules in vibrationally excited states, and will enable astronomers to search for rotational transitions originating from $\upsilon_{24}$ of propylene oxide in interstellar space.
description: Electronic pre-print version of the pre-submission. IMPORTANT: changes in parts of the spectral analysis with XIAM emerged during the peer-reviewing procedure! The original peer-reviewed publication and Supplementary Material (SI) are available under the DOI: 10.1016/j.jms.2021.111445
D2.1 First Conceptualization of Choice Criteria and Incentives
Creators: name: Comerio, Marco
name: Scrocca, Mario
name: Scandolari, Damiano
name: Javadian Sabet, Alireza
Publisher: name: Zenodo
Year: 2020
Subjects: RIDE2RAIL
Transport
Shift2Rail
Multi-modal travel
Offer Categories
User Preferences
Incentives

description: The deliverable presents the first conceptualization of choice criteria and incentives for multi-modal travel offers defined by RIDE2RAIL. The deliverable provides a comprehensive literature review and analysis of relevant research projects dealing with Offer Categories, User Preferences, and Incentives. Furthermore, since the RIDE2RAIL conceptualization of choice criteria and incentives aims to contribute to the activities of the Shift2Rail IP4 work programme, the deliverable identifies and analyses the IP4 terminology linked with the scope of the project. The deliverable describes the methodology adopted for the alignment of the Ride2Rail conceptualization with the terminology currently used in IP4 projects, finalized through the support of CFM partners in the 1st Ride2Rail-IP4 Collaboration Meeting. Considering the performed state-of-the-art analysis and IP4 terminology alignment, the first conceptualization of choice criteria and incentives is proposed as an extension of the current IP4 glossary. Moreover, a draft list of new components that should be implemented to deal with the defined concepts in the IP4 ecosystem is presented. Finally, concrete instances of choice criteria and incentives are described in terms of: (i) a preliminary catalogue of Offer Categories; (ii) the first version of the travellers’ preference model, extending the User Preferences currently managed in IP4 solutions; (iii) a preliminary catalogue of incentives to promote multi-modal travel offers.
Dark Energy and Gravity
Creators: name: Padmanabhan, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: I review the problem of dark energy focusing on the cosmological constant as the candidate and discuss its implications for the nature of gravity. Part 1 briefly overviews the currently popular `concordance cosmology' and summarises the evidence for dark energy. It also provides the observational and theoretical arguments in favour of the cosmological constant as the candidate and emphasises why no other approach really solves the conceptual problems usually attributed to the cosmological constant. Part 2 describes some of the approaches to understand the nature of the cosmological constant and attempts to extract the key ingredients which must be present in any viable solution. I argue that (i)the cosmological constant problem cannot be satisfactorily solved until gravitational action is made invariant under the shift of the matter lagrangian by a constant and (ii) this cannot happen if the metric is the dynamical variable. Hence the cosmological constant problem essentially has to do with our (mis)understanding of the nature of gravity. Part 3 discusses an alternative perspective on gravity in which the action is explicitly invariant under the above transformation. Extremizing this action leads to an equation determining the background geometry which gives Einstein's theory at the lowest order with Lanczos-Lovelock type corrections. (Condensed abstract).
description: Invited Review for a special Gen.Rel.Grav. issue on Dark Energy, edited by G.F.R.Ellis, R.Maartens and H.Nicolai; revtex; 22 pages; 2 figures
Infrared lags in the light curves of AGN measured using a deep survey
Creators: name: Elmer, E.
name: Merrifield, M.
name: Almaini, O.
name: Hartley, W. G.
name: Maltby, D. T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Information on the structure around active galactic nuclei (AGN) has long been derived from measuring lags in their varying light output at different wavelengths. In principle, infrared data would reach to larger radii, potentially even probing reprocessed radiation in any surrounding dusty torus. In practice, this has proved challenging because high quality data are required to detect such variability, and the observations must stretch over a long period to probe the likely month-scale lags in variability. In addition, large numbers of sources would need to be observed to start searching for any patterns in such lags. Here, we show that the UKIDSS Ultra Deep Survey, built up from repeated observations over almost a decade, provides an ideal data set for such a study. For 94 sources identified as strongly-varying AGN within its square-degree field, we find that the K-band light curves systematically lag the J-band light curves by an average of around a month. The lags become smaller at higher redshift, consistent with the band shift to optical rest-frame emission. The less luminous AGN also display shorter lags, as would be expected if their physical size scales with luminosity.
description: 4 pages, 4 figures, accepted for publication as a letter in MNRAS
Critical behavior of long straight rigid rods on two-dimensional lattices: Theory and Monte Carlo simulations
Creators: name: Matoz-Fernandez, D. A.
name: Linares, D. H.
name: Ramirez-Pastor, A. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The critical behavior of long straight rigid rods of length $k$ ($k$-mers) on square and triangular lattices at intermediate density has been studied. A nematic phase, characterized by a big domain of parallel $k$-mers, was found. This ordered phase is separated from the isotropic state by a continuous transition occurring at a intermediate density $θ_c$. Two analytical techniques were combined with Monte Carlo simulations to predict the dependence of $θ_c$ on $k$, being $θ_c(k) \propto k^{-1}$. The first involves simple geometrical arguments, while the second is based on entropy considerations. Our analysis allowed us also to determine the minimum value of $k$ ($k_{min}=7$), which allows the formation of a nematic phase on a triangular lattice.
description: 23 pages, 5 figures, to appear in The Journal of Chemical Physics
Accumulated prediction errors, information criteria and optimal forecasting for autoregressive time series
Creators: name: Ing, Ching-Kang
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 60M20 (Primary); 62F12, 62M10 (Secondary)

description: The predictive capability of a modification of Rissanen's accumulated prediction error (APE) criterion, APE$_{δ_n}$, is investigated in infinite-order autoregressive (AR($\infty$)) models. Instead of accumulating squares of sequential prediction errors from the beginning, APE$_{δ_n}$ is obtained by summing these squared errors from stage $nδ_n$, where $n$ is the sample size and $1/n\leq δ_n\leq 1-(1/n)$ may depend on $n$. Under certain regularity conditions, an asymptotic expression is derived for the mean-squared prediction error (MSPE) of an AR predictor with order determined by APE$_{δ_n}$. This expression shows that the prediction performance of APE$_{δ_n}$ can vary dramatically depending on the choice of $δ_n$. Another interesting finding is that when $δ_n$ approaches 1 at a certain rate, APE$_{δ_n}$ can achieve asymptotic efficiency in most practical situations. An asymptotic equivalence between APE$_{δ_n}$ and an information criterion with a suitable penalty term is also established from the MSPE point of view. This offers new perspectives for understanding the information and prediction-based model selection criteria. Finally, we provide the first asymptotic efficiency result for the case when the underlying AR($\infty$) model is allowed to degenerate to a finite autoregression.
description: Published at http://dx.doi.org/10.1214/009053606000001550 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Comparing Multi-Informant Assessment Measures of Parental Monitoring and  Their Links with Adolescent Delinquent Behavior
Creators: name: Augenstein, Tara Marie
Publisher: name: Digital Repository at the University of Maryland
Year: 2014
Subjects: subject: Clinical psychology
subject: assessment
subject: delinquent behavior
subject: informant
subject: parental knowledge
subject: parental monitoring

description: Research has identified links between parents' poor monitoring of adolescents' whereabouts and activities and adolescents' increased engagement in delinquent behaviors.  This study extended prior work by examining differential relations between parental monitoring measures (i.e., behavioral vs. knowledge measures) and informants (parent vs. adolescent) and adolescent self-reported delinquency.  Seventy-four caregivers and adolescents completed survey measures of parental monitoring and parental knowledge, and adolescents completed self-report surveys of delinquent behavior.  Adolescents' delinquent behavior related to measures of parental monitoring behaviors and parental knowledge; however, the magnitudes of these relations varied by informant.  That is, I observed stronger magnitude relations between adolescent delinquent behavior and parental knowledge measures for parent-report relative to adolescent-report.  Conversely, I observed stronger magnitude relations between adolescent delinquent behavior and measures of parental monitoring behaviors for adolescent-report relative to parent-report.  These findings inform measurement selection in research and clinical assessments of parental monitoring and adolescent delinquent behavior.
RASTAROPSHA (SILIYBUM MARIANUM L ) O'SIMLIGINING XALQ TABOBATIDA VA TIBBIYOTDA ISHLATILISHI
Creators: name: Panjibek Barotov Rahmonqulovich Termiz shahar Agrotexnologyalar va innovatsion rivojlantirish instituti Dorivor òsimliklarni rivojlantirish
Publisher: name: Zenodo
Year: 2024

description: Ushbu ilmiy ishda Rastaropsha (siliybum marianum L ) o’simligining xalq tabobatida va tibbiyotda ishlatilishi haqida so`z yuritilgan.

Kalit so`zlar: oshqozon – ichak faoliyati, o'simlik gepatoprotektori, Demensiya, o'simlik birikmalari, diabet kasalligi, dorivor oʻsimliklar.
A cavity-based optical antenna for color centers in diamond
Creators: name: Fuchs, Philipp
name: Jung, Thomas
name: Kieschnick, Michael
name: Meijer, Jan
name: Becher, Christoph
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: An efficient atom-photon-interface is a key requirement for the integration of solid-state emitters such as color centers in diamond into quantum technology applications. Just like other solid state emitters, however, their emission into free space is severely limited due to the high refractive index of the bulk host crystal. In this work, we present a planar optical antenna based on two silver mirrors coated on a thin single crystal diamond membrane, forming a planar Fabry-Pérot cavity that improves the photon extraction from single tin vacancy (SnV) centers as well as their coupling to an excitation laser. Upon numerical optimization of the structure, we find theoretical enhancements in the collectible photon rate by a factor of 60 as compared to the bulk case. As a proof-of-principle demonstration, we fabricate single crystal diamond membranes with sub-$μ$m thickness and create SnV centers by ion implantation. Employing off-resonant excitation, we show a 6-fold enhancement of the collectible photon rate, yielding up to half a million photons per second from a single SnV center. At the same time, we observe a significant reduction of the required excitation power in accordance with theory, demonstrating the functionality of the cavity as an optical antenna. Due to its planar design, the antenna simultaneously provides similar enhancements for a large number of emitters inside the membrane. Furthermore, the monolithic structure provides high mechanical stability and straightforwardly enables operation under cryogenic conditions as required in most spin-photon interface implementations.
description: The following article contains 31 pages and 6 figures and has been submitted to APL Photonics
The JADE code: Coupling secular exoplanetary dynamics and photo-evaporation
Creators: name: Attia, O.
name: Bourrier, V.
name: Eggenberger, P.
name: Mordasini, C.
name: Beust, H.
name: Ehrenreich, D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Close-in planets evolve under extreme conditions, raising questions about their origins and current nature. Two predominant mechanisms are orbital migration, which brings them close to their star, and atmospheric escape under the resulting increased irradiation. Yet, their relative roles remain unclear because we lack models that couple the two mechanisms with high precision on secular timescales. To address this need, we developed the JADE code, which simulates the secular atmospheric and dynamical evolution of a planet around its star, and can include the perturbation induced by a distant third body. On the dynamical side, the 3D evolution of the orbit is modeled under stellar and planetary tidal forces, a relativistic correction, and the action of the distant perturber. On the atmospheric side, the vertical structure of the atmosphere is integrated over time based on its thermodynamical properties, inner heating, and the evolving stellar irradiation, which results, in particular, in photo-evaporation. The JADE code is benchmarked on GJ436 b, prototype of evaporating giants on eccentric, misaligned orbits at the edge of the hot Neptunes desert. We confirm that its orbital architecture is well explained by Kozai migration and unveil a strong interplay between its atmospheric and orbital evolution. During the resonance phase, the atmosphere pulsates in tune with the Kozai cycles, which leads to stronger tides and an earlier migration. This triggers a strong evaporation several Gyr after the planet formed, refining the paradigm that mass loss is dominant in the early age of close-in planets. This suggests that the edge of the desert could be formed of warm Neptunes whose evaporation was delayed by migration. It strengthens the importance of coupling atmospheric and dynamical evolution over secular timescales, which the JADE code will allow simulating for a wide range of systems.
description: 20 pages, 2 figures, accepted in A&A
Black hole spectroscopy horizons for current and future gravitational wave detectors
Creators: name: Ota, Iara
name: Chirenti, Cecilia
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Black hole spectroscopy is the proposal to observe multiple quasinormal modes in the ringdown of a binary black hole merger. In addition to the fundamental quadrupolar mode, overtones and higher harmonics may be present and detectable in the gravitational wave signal, allowing for tests of the no-hair theorem. We analyze in detail the strengths and weaknesses of the standard Rayleigh criterion supplied with a Fisher matrix error estimation, and we find that the criterion is useful, but too restrictive. Therefore we motivate the use of a conservative high Bayes factor threshold to obtain the black hole spectroscopy horizons of current and future detectors, i.e., the distance (averaged in sky location and binary inclination) up to which one or more additional modes can be detected and confidently distinguished from each other. We set up all of our searches for additional modes starting at $t = 10(M_1+M_2)$ after the peak amplitude in simulated signals of circular nonspinning binaries. An agnostic multimode analysis allows us to rank the subdominant modes: for nearly equal mass binaries we find $(\ell, m, n) = (2,2,1)$ and $(3,3,0)$ and, for very asymmetric binaries, $(3,3,0)$ and $(4,4,0)$, for the secondary and tertiary modes, respectively. At the current estimated rates for heavy stellar mass binary black hole mergers, with primary masses between 45 and 100 solar masses, we expect an event rate of mergers within our conservative estimate for the $(2,2,1)$ spectroscopy horizon of $0.03 - 0.10\ {\rm yr}^{-1}$ for LIGO at design sensitivity and $(0.6 - 2.4) \times 10^3\ {\rm yr}^{-1}$ for the future third generation ground-based detector Cosmic Explorer.
description: 19 pages, 17 figures, version accepted for publication on PRD
Birth and Death in a Continuous Opinion Dynamics Model. The consensus case
Creators: name: Carletti, Timoteo
name: Fanelli, Duccio
name: Guarino, Alessio
name: Bagnoli, Franco
name: Guazzini, Andrea
Publisher: name: arXiv
Year: 2008
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: We here discuss the process of opinion formation in an open community where agents are made to interact and consequently update their beliefs. New actors (birth) are assumed to replace individuals that abandon the community (deaths). This dynamics is simulated in the framework of a simplified model that accounts for mutual affinity between agents. A rich phenomenology is presented and discussed with reference to the original (closed group) setting. Numerical findings are supported by analytical calculations.
description: 13 pages, 6 figures
Thermal Operator and Dispersion Relation in QED at Finite Temperature and Chemical Potential
Creators: name: Das, Ashok
name: Frenkel, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Combining the thermal operator representation with the dispersion relation in QED at finite temperature and chemical potential, we determine the complete retarded photon self-energy only from its absorptive part at zero temperature. As an application of this method, we show that, even for the case of a nonzero chemical potential, the temperature dependent part of the one loop retarded photon self-energy vanishes in $(1+1)$ dimensional massless QED.
description: 5 pages, revtex
Generalized disformal invariance of cosmological perturbations with second-order field derivatives
Creators: name: Minamitsuji, Masato
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate how the comoving curvature and tensor perturbations are transformed under the generalized disformal transformation with the second-order covariant derivatives of the scalar field, where the free functions depend on the fundamental elements constructed with the covariant derivatives of the scalar field with at most the quadratic order of the second-order covariant derivatives. Our analysis reveals that on the superhorizon scales the difference between the comoving curvature perturbations in the original and new frames is given by the combination of the time derivative of the comoving curvature perturbation, the intrinsic entropy perturbation of the scalar field, and its time derivative in the original frame. Thus, in the case that on the superhorizon scales (1) the intrinsic entropy perturbation and its time derivative vanish and (2) the comoving curvature perturbation in the original frame, ${\cal R}_c$, is conserved, the comoving curvature perturbation becomes invariant under the disformal transformation on the superhorizon scales. We also show that the tensor perturbations are also disformally invariant, in the case that the tensor perturbations in the original frame are conserved with time.
description: 11 pages, published version
Universal observation of multiple order parameters in cuprate superconductors
Creators: name: Khasanov, R.
name: Strässle, S.
name: Di Castro, D.
name: Masui, T.
name: Miyasaka, S.
name: Tajima, S.
name: Bussmann-Holder, A.
name: Keller, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The temperature dependence of the London penetration depth λwas measured for an untwined single crystal of YBa_2Cu_3O_{7-δ} along the three principal crystallographic directions (a, b, and c). Both in-plane components (λ_a and λ_b) show an inflection point in their temperature dependence which is absent in the component along the c-direction (λ_c). The data provide convincing evidence that the in-plane superconducting order parameter is a mixture of s+d-wave symmetry whereas it is exclusively s-wave along the c-direction. In conjunction with previous results it is concluded that coupled s+d-order parameters are universal and intrinsic to cuprate superconductors.
description: 5 pages, 3 figures
Broadening the bandwidth of entangled photons: a step towards the generation of extremely short biphotons
Creators: name: Hendrych, M.
name: Shi, X.
name: Valencia, A.
name: Torres, J. P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate a technique that allows to fully control the bandwidth of entangled photons independently of the frequency band of interest and of the nonlinear crystal. We show that this technique allows to generate nearly transform-limited biphotons with almost one octave of bandwidth (hundreds of THz) which corresponds to correlation times of just a few femtoseconds. The presented method becomes an enabling tool for attosecond entangled-photons quantum optics. The technique can also be used to generate paired photons with a very high degree of entanglement.
description: 4 pages
Quantum fluctuations on top of a $\mathcal{PT}$-symmetric Bose-Einstein Condensate
Creators: name: Cui, Xiaoling
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the effects of quantum fluctuations in a parity-time($\mathcal{PT}$) symmetric two-species Bose-Einstein Condensate(BEC). It is found that the $\mathcal{PT}$-symmetry, though preserved by the macroscopic condensate, can be spontaneously broken by its Bogoliubov quasi-particles under quantum fluctuations. The associated $\mathcal{PT}$-breaking transitions in the Bogoliubov spectrum can be conveniently tuned by the interaction anisotropy in spin channels and the strength of $\mathcal{PT}$ potential. In the $\mathcal{PT}$-unbroken regime, the real Bogoliubov modes are generally gapped, in contrast to the gapless phonon mode in Hermitian case. Moreover, the presence of $\mathcal{PT}$ potential is found to enhance the mean-field collapse and thereby intrigue the droplet formation after incorporating the repulsive force from quantum fluctuations. These remarkable interplay effects of $\mathcal{PT}$-symmetry and interaction can be directly probed in cold atoms experiments, which shed light on related quantum phenomena in general $\mathcal{PT}$-symmetric systems.
description: 11 pages, 4 figures
Lorenz-like chaotic attractors revised
Creators: name: Araujo, Vitor
name: Pacifico, Maria Jose
Publisher: name: arXiv
Year: 2008
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37D25, 37D30

description: We describe some recent results on the dynamics of singular-hyperbolic (or Lorenz-like) attractors: attractors in this class are expansive and so sensitive with respect to initial data; they admit a unique physical measure whose support is the whole attractor, which is hyperbolic and the equilibrium state with respect to the center-unstable Jacobian; the hitting time associated to a geometric Lorenz attractor satisfies a logarithm law; the rate of large deviations for the physical measure on the ergodic basin of a geometric Lorenz attractor is exponential.
description: 19 pages, 6 figures, short survey paper for the Springer Proceedings associated to the DYNA2008 Conference: Dynamics & Applications in honour of Mauricio Peixoto and David Rand
Resummation and the semiclassical theory of spectral statistics
Creators: name: Keating, Jonathan P.
name: Müller, Sebastian
Publisher: name: arXiv
Year: 2007
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We address the question as to why, in the semiclassical limit, classically chaotic systems generically exhibit universal quantum spectral statistics coincident with those of Random Matrix Theory. To do so, we use a semiclassical resummation formalism that explicitly preserves the unitarity of the quantum time evolution by incorporating duality relations between short and long classical orbits. This allows us to obtain both the non-oscillatory and the oscillatory contributions to spectral correlation functions within a unified framework, thus overcoming a significant problem in previous approaches. In addition, our results extend beyond the universal regime to describe the system-specific approach to the semiclassical limit.
description: 10 pages, no figures
PANIC: the new panoramic NIR camera for Calar Alto
Creators: name: Baumeister, H.
name: Alter, M.
name: Vazquez, M. C. Cardenas
name: Fernandez, M.
name: Fried, J.
name: Helmling, J.
name: Huber, A.
name: Mengual, J. Ibanez
name: Gomez, J. F. Rodriguez
name: Laun, W.
name: Lenzen, R.
name: Mall, U.
name: Naranjo, V.
name: Ramos, J.
name: Rohloff, R.
name: Segura, A. Garcia
name: Storz, C.
name: Ubierna, M.
name: Wagner, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: PANIC is a wide-field NIR camera, which is currently under development for the Calar Alto observatory (CAHA) in Spain. It uses a mosaic of four Hawaii-2RG detectors and covers the spectral range from 0.8-2.5 micron(z to K-band). The field-of-view is 30x30 arcmin. This instrument can be used at the 2.2m telescope (0.45arcsec/pixel, 0.5x0.5 degree FOV) and at the 3.5m telescope (0.23arcsec/pixel, 0.25x0.25 degree FOV). The operating temperature is about 77K, achieved by liquid Nitrogen cooling. The cryogenic optics has three flat folding mirrors with diameters up to 282 mm and nine lenses with diameters between 130 mm and 255 mm. A compact filter unit can carry up to 19 filters distributed over four filter wheels. Narrow band (1%) filters can be used. The instrument has a diameter of 1.1 m and it is about 1 m long. The weight limit of 400 kg at the 2.2m telescope requires a light-weight cryostat design. The aluminium vacuum vessel and radiation shield have wall thicknesses of only 6 mm and 3 mm respectively.
description: This paper has been presented in the SPIE of Astronomical Telescopes and Instrumentation 2008 in Marseille (France)
Quantum noise in a nano mechanical Duffing resonator
Creators: name: Babourina-Brooks, E.
name: Doherty, A.
name: Milburn, G. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We determine the small signal gain and noise response of an amplifier based on the nonlinear response of a quantum nanomechanical resonator. The resonator is biased in the nonlinear regime by a strong harmonic bias force and we determine the response to a small additional driving signal detuned with respect to the bias force.
description: submitted to the Focus Issue on 'Mechanical Systems at the Quantum Limit', edited by Markus Aspelmeyer and Keith Schwab
Falling into the Schwarzschild black hole. Important details
Creators: name: Krasnikov, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Schwarzschild space is one of the best studied spacetimes and its exhaustive considerations are easily accessible. Nevertheless, by some reasons it is still surrounded by a lot of misconceptions, myths, and "paradoxes". In this pedagogical paper an attempt is made to give a simple (i. e., without cumbersome calculations), but rigorous consideration to the relevant questions. I argue that 1) an observer falling into a Schwarzschild black hole will \emph{not} see "the entire history of the universe" 2) he will \emph{not} cross the horizon at the speed of light 3) when inside the hole, he will \emph{not} see the (future) singularity and 4) the latter is \emph{not} "central".
description: v1. In Russian v.2 Replaced by the English version
Multi-Line Geometry of Qubit-Qutrit and Higher-Order Pauli Operators
Creators: name: Planat, Michel R. P.
name: Baboin, Anne-Céline
name: Saniga, Metod
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The commutation relations of the generalized Pauli operators of a qubit-qutrit system are discussed in the newly established graph-theoretic and finite-geometrical settings. The dual of the Pauli graph of this system is found to be isomorphic to the projective line over the product ring Z2xZ3. A "peculiar" feature in comparison with two-qubits is that two distinct points/operators can be joined by more than one line. The multi-line property is shown to be also present in the graphs/geometries characterizing two-qutrit and three-qubit Pauli operators' space and surmised to be exhibited by any other higher-level quantum system.
description: 8 pages, 6 figures. International Journal of Theoretical Physics (2007) accept\'e
Online Learning in Discrete Hidden Markov Models
Creators: name: Alamino, Roberto C.
name: Caticha, Nestor
Publisher: name: arXiv
Year: 2007
Subjects: subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: We present and analyse three online algorithms for learning in discrete Hidden Markov Models (HMMs) and compare them with the Baldi-Chauvin Algorithm. Using the Kullback-Leibler divergence as a measure of generalisation error we draw learning curves in simplified situations. The performance for learning drifting concepts of one of the presented algorithms is analysed and compared with the Baldi-Chauvin algorithm in the same situations. A brief discussion about learning and symmetry breaking based on our results is also presented.
description: 8 pages, 6 figures
Geometric potentials in quantum optics: A semi-classical interpretation
Creators: name: Cheneau, Marc
name: Rath, Steffen Patrick
name: Yefsah, Tarik
name: Günter, Kenneth John
name: Juzeliunas, Gediminas
name: Dalibard, Jean
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a semi-classical interpretation of the geometric scalar and vector potentials that arise due to Berry's phase when an atom moves slowly in a light field. Starting from the full quantum Hamiltonian, we turn to a classical description of the atomic centre-of-mass motion while still treating the internal degrees of freedom as quantum variables. We show that the scalar potential can be identified as the kinetic energy of an atomic micro-motion caused by quantum fluctuations of the radiative force, and that the Lorentz-type force appears as a result of the motion-induced perturbation of the internal atomic state. For a specific configuration involving two counter-propagating Gaussian laser beams, we relate the geometric forces to the radiation pressure and dipole forces known from quantum optics. The simple physical pictures provided by the present analysis may help for the design and the implementation of novel geometric forces.
description: 6 pages, 1 figure, minor typos corrected
The phase structure of a chirally invariant lattice Higgs-Yukawa model for small and for large values of the Yukawa coupling constant
Creators: name: Gerhold, P.
name: Jansen, K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We consider a chirally invariant lattice Higgs-Yukawa model based on the Neuberger overlap operator. As a first step towards the eventual determination of Higgs mass bounds we study the phase diagram of the model analytically in the large Nf-limit. We present an expression for the effective potential at tree-level in the regime of small Yukawa and quartic coupling constants and determine the order of the phase transitions. In the case of strong Yukawa couplings the model effectively becomes an O(4)-symmetric non-linear sigma-model for all values of the quartic coupling constant. This leads to the existence of a symmetric phase also in the regime of large values of the Yukawa coupling constant. On finite and small lattices, however, strong finite volume effects prevent the expectation value of the Higgs field from vanishing thus obscuring the existence of the symmetric phase at strong Yukawa couplings.
description: 21 pages, 6 figures, added references
Radiative kaon capture processes : K⁻p --> Y [gamma] and K⁻d --> [Lambda] n [gamma]
Creators: name: Workman, Ronald Lester
Publisher: name: University of British Columbia
Year: 2010

description: The radiative capture reactions K⁻p → ΛƳ, K⁻p → Ʃ⁰Ƴ and K⁻d → An Ƴ are investigated. Branching fractions are calculated for the K⁻p reactions within a pole model alternatively utilizing both pseudoscalar and pseudovector coupling schemes. The photon spectrum has been calculated for the K⁻d → AnƳ within an impulse approximation model. The above calculations are particularly important as new and more precise data pertaining to the above reactions are expected from a recent Brookhaven experiment. Both the pseudoscalar and pseudovector coupling schemes give branching fractions within the current experimental bounds. Sensitivity to the Λ(1405) resonance is explored and improved constraints are determined for its contribution. A transition operator is also derived for use in the K⁻d → AnƳ calculation. Our methods and results are compared with those of other recent calculations of these reactions. The K⁻d → AnƳ photon spectrum is also calculated in order to explore its sensitivity to the Λ — n final state interaction. The high energy end of the photon spectrum is found to be sensitive to the choice of Λ — n scattering parameters, yet relatively insensitive to the contributions from ƩN → Λn conversion, the choice of deuteron wavefunctions and momentum dependence in the transition operator.
Gemini GMOS/IFU spectroscopy of NGC 1569 - I: Mapping the properties of a young star cluster and its environment
Creators: name: Westmoquette, M. S.
name: Exter, K. M.
name: Smith, L. J.
name: Gallagher, J. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: [Abridged] We present Gemini-North GMOS/IFU observations of a young star cluster (cluster 10) and its environment near the centre of the dwarf irregular starburst galaxy NGC 1569. This forms part of a larger and on-going study of the formation and collimation mechanisms of galactic winds, including three additional IFU pointings in NGC 1569 covering the base of the galactic wind which are analysed in a companion paper. The good spatial- and spectral-resolution of these GMOS/IFU observations, covering 4740-6860 A, allow us to probe the interactions between clusters and their environments on small scales. Combining our GMOS spectrum with HST imaging, we find that cluster 10 is composed of two very close components with ages of 5-7 Myr and <5 Myr, and a combined mass of 7 +/- 5 x 10^3 Msun. A detailed analysis of the H_alpha emission line profile shapes across the whole field-of-view shows them to be composed of a bright narrow feature (intrinsic FWHM ~ 50 km/s) superimposed on a fainter broad component (FWHM < 300 km/s). By mapping the properties of each individual component, we investigate the small-scale structure and properties of the ionized ISM, including reddening, excitation and electron densities, and for the first time find spatial correlations between the line component properties. We discuss in detail the possible mechanisms that could give rise to the two components and these correlations, and conclude that the most likely explanation for the broad emission is that it is produced in a turbulent mixing layer on the surface of the cool gas clumps embedded within the hot, fast-flowing cluster winds. We conclude we are sampling well within the outer bounding shocks of the expanding superbubbles and within the outflow 'energy injection zone'.
description: 22 pages, 14 figures, 4 tables, accepted to MNRAS
D5.4 - BBioNets Advisory Board - Draft
Creators: name: Girón Domínguez, Carmen
Publisher: name: Zenodo
Year: 2024
Subjects: Advisory Board
members
project consultants
experts
BBioNets
EIP-AGRI
Operational Group
Engagement

description: The BBioNets Advisory Board (AB) will play a key role throughout the duration of the project, complementing the consortium’s efforts by providing strategic guidance on the BBioNets activities, supporting the validation and credibility of the main project outcomes, and increasing their visibility and sustainability.

The AB will comprise a diverse pool of professionals from various backgrounds and expertise in the sectors of forestry and agriculture, such as representatives of Operational Groups, cooperative/farmer associations, cooperative/forest associations, and regional authorities.

All AB members will function as “project consultants” providing valuable feedback to align project activities and outcomes with the needs of users and stakeholders, as well as “project ambassadors,” helping the promotion and dissemination of the project through their various networks. Drawing upon their extensive networks, they will facilitate collaborations and alliances to ensure BBioNets’ successful implementation.

The BBioNets AB is expected to:

Validate the “regional scenarios”, i.e. a list of the most suitable Bio-Based Technologies for each targeted region.

Test the BBTs assessment tool, i.e. an online tool matching the most suitable Bio-Based Technologies to each target region based on technical, environmental, economic, and social aspects.

Suggest relevant Bio-Based Technologies and EIP-AGRI Operational Groups to include in the BBioNets online inventory and knowledge collection.

Recommend the most suitable communication and dissemination channels to enhance the project outreach.

Occasionally participate in BBioNets online meetings.

The 4-step process followed for the identification of the experts to be involved in the BBioNets AB is the following:

Nominations: each partner identified and proposed experts according to the expertise and profile needed for the project.

Assessment and selection: the proposed candidates were assessed, and the most suitable ones were selected.

Invitation and engagement: partners formally invited the experts selected by sending them the pertinent administrative documentation from the invitation kit.

Acceptance: the experts who accepted the invitation signed the requested documents signed.

As a result of the partners’ efforts, the Advisory Board at this early stage of the project is composed of eleven (11) experts who are committed to meet their role as BBioNets AB members.
A Bayesian approach to the estimation of maps between riemannian manifolds
Creators: name: Butler, Leo T.
name: Levit, Boris
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62C10, 62C20

description: Let Θbe a smooth compact oriented manifold without boundary, embedded in a euclidean space and let γbe a smooth map Θinto a riemannian manifold Λ. An unknown state θ\in Θis observed via X=θ+εξwhere ε>0 is a small parameter and ξis a white Gaussian noise. For a given smooth prior on Θand smooth estimator g of the map γwe derive a second-order asymptotic expansion for the related Bayesian risk. The calculation involves the geometry of the underlying spaces Θand Λ, in particular, the integration-by-parts formula. Using this result, a second-order minimax estimator of γis found based on the modern theory of harmonic maps and hypo-elliptic differential operators.
description: 20 pages, no figures published version includes correction to eq.s 31, 41, 43
Wishart distributions for decomposable graphs
Creators: name: Letac, Gérard
name: Massam, Hélène
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62H99 (Primary); 62E15 (Secondary)

description: When considering a graphical Gaussian model ${\mathcal{N}}_G$ Markov with respect to a decomposable graph $G$, the parameter space of interest for the precision parameter is the cone $P_G$ of positive definite matrices with fixed zeros corresponding to the missing edges of $G$. The parameter space for the scale parameter of ${\mathcal{N}}_G$ is the cone $Q_G$, dual to $P_G$, of incomplete matrices with submatrices corresponding to the cliques of $G$ being positive definite. In this paper we construct on the cones $Q_G$ and $P_G$ two families of Wishart distributions, namely the Type I and Type II Wisharts. They can be viewed as generalizations of the hyper Wishart and the inverse of the hyper inverse Wishart as defined by Dawid and Lauritzen [Ann. Statist. 21 (1993) 1272--1317]. We show that the Type I and II Wisharts have properties similar to those of the hyper and hyper inverse Wishart. Indeed, the inverse of the Type II Wishart forms a conjugate family of priors for the covariance parameter of the graphical Gaussian model and is strong directed hyper Markov for every direction given to the graph by a perfect order of its cliques, while the Type I Wishart is weak hyper Markov. Moreover, the inverse Type II Wishart as a conjugate family presents the advantage of having a multidimensional shape parameter, thus offering flexibility for the choice of a prior.
description: Published at http://dx.doi.org/10.1214/009053606000001235 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
A perturbative approach for the crystal chains with self-consistent stochastic reservoirs
Creators: name: Falcao, Ricardo
name: Neto, Antônio Francisco
name: Pereira, Emmanuel
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider the harmonic chain of oscillators with self-consistent stochastic reservoirs and give a new proof for the finitude of its thermal conductivity in the steady state. The approach, with involves an integral representation for the correlations (heat flow)and a perturbative analysis, is quite general and extendable to the study of anharmonic systems.
description: to be published in Theoretical and Mathematical Physics
The Lorentz factor distribution and luminosity function of relativistic jets in AGNs
Creators: name: Liu, Yuan
name: Zhang, Shuang Nan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The observed apparent velocities and luminosities of the relativistic jets in AGNs are significantly different from their intrinsic values due to strong special relativistic effects. We adopt the maximum likelihood method to determine simultaneously the intrinsic luminosity function and the Lorentz factor distribution of a sample of AGNs. The values of the best estimated parameters are consistent with the previous results, but with much better accuracy. In previous study, it was assumed that the shape of the observed luminosity function of Fanaroff-Riley type II radio galaxies is the same with the intrinsic luminosity function of radio loud quasars. Our results prove the validity of this assumption. We also find that low and high redshift groups divided by z=0.1 are likely to be from different parent populations.
description: 18 pages, 7 figures. The original version of this paper was submitted to ApJL on January 19, 2007. The current version was submitted to ApJ on April 15, 2007 and accepted on May 16, 2007
Q7-branes and their coupling to IIB supergravity
Creators: name: Bergshoeff, Eric
name: Hartong, Jelle
name: Sorokin, Dmitri
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show how, by making use of a new basis of the IIB supergravity axion-dilaton coset, SL(2,R)/SO(2), 7-branes that belong to different conjugacy classes of the duality group SL(2,R) naturally couple to IIB supergravity with appropriate source terms characterized by an SL(2,R) charge matrix Q. The conjugacy classes are determined by the value of the determinant of Q. The (p,q) 7-branes are the branes in the conjugacy class detQ = 0. The 7-branes in the conjugacy class detQ > 0 are labelled by three numbers (p,q,r) which parameterize the matrix Q and will be called Q7-branes. We construct the full bosonic Wess--Zumino term for the Q7-branes. In order to realize a gauge invariant coupling of the Q7-brane to the gauge fields of IIB supergravity it is necessary to introduce an SL(2,R) doublet of two distinct Born--Infeld fields on the Q7-brane world-volume.
description: 31 pages, Latex file
Heegaard Floer homology and genus one, one boundary component open books
Creators: name: Baldwin, John A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geometric Topology (math.GT)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics

description: We compute the Heegaard Floer homology of any rational homology 3-sphere with an open book decomposition of the form (T,ϕ), where T is a genus one surface with one boundary component. In addition, we compute the Heegaard Floer homology of any T^2-bundle over S^1 with first Betti number equal to one, and we compare our results with those of Lebow on the embedded contact homology of such torus bundles. We use these computations to place restrictions on Stein-filllings of the contact structures compatible with such open books, to narrow down somewhat the class of 3-braid knots with finite concordance order, and to identify all quasi-alternating links with braid index at most 3.
description: Added section about Stein-fillings, fixed some references