cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Comparing multi-field primordial feature models with the Planck data
Creators: name: Braglia, Matteo
name: Chen, Xingang
name: Hazra, Dhiraj Kumar
Publisher: name: arXiv
Year: 2021
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: In this paper, we use a complete model of classical primordial standard clocks as an example to develop a methodology of directly comparing numerical predictions from complicated multi-field feature models with the Planck data, including the Planck 2018 Plik unbinned likelihood and the statistically most powerful CamSpec 2020 likelihood for temperature and polarization data. As this two-field inflationary model offers a plethora of primordial feature spectra that represent combinations of sharp and resonance feature signals non-trivially distributed over extended cosmological scales, its data comparison has not been satisfactorily addressed by previous attempts using analytical templates. The method of this paper, consisting of numerical prediction, effective parameter construction and nested sampling data comparison, allows us to efficiently explore every possible spectra from the model. We classify the resulting feature candidates in three different frequency ranges. We use the Bayesian evidences to assess the statistical significance of the candidates over the baseline model, taking into account the effect of additional parameters and the look-elsewhere effect. Although none of the candidates is statistically significant, the methodology of this paper can be used to facilitate the future model-building and data-screening process of primordial features, and the candidates can be subjected to further tests with data from the upcoming cosmic microwave background polarization observations and galaxy surveys.
description: v1: 37 pages, 19 figures and 3 tables; v2: references added, accepted for publication in JCAP
Sampling the Lindelöf Hypothesis with the Cauchy Random Walk
Creators: name: Lifshits, Mikhail
name: Weber, Michel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: Complex Variables (math.CV)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11M06, 60G50, 60F15

description: We study the behavior of the Riemann zeta function on the critical line when the imaginary part of the argument is sampled by the Cauchy random walk. We develop a complete second order theory for the corresponding system of random variables and show that it behaves almost like a system of non-correlated variables. Exploiting this fact in relation with known criteria for almost sure convergence allows to investigate its almost sure asymptotic behavior.
MadFlow: automating Monte Carlo simulation on GPU for particle physics processes
Creators: name: Carrazza, Stefano
name: Cruz-Martinez, Juan
name: Rossi, Marco
name: Zaro, Marco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present MadFlow, a first general multi-purpose framework for Monte Carlo (MC) event simulation of particle physics processes designed to take full advantage of hardware accelerators, in particular, graphics processing units (GPUs). The automation process of generating all the required components for MC simulation of a generic physics process and its deployment on hardware accelerator is still a big challenge nowadays. In order to solve this challenge, we design a workflow and code library which provides to the user the possibility to simulate custom processes through the MadGraph5_aMC@NLO framework and a plugin for the generation and exporting of specialized code in a GPU-like format. The exported code includes analytic expressions for matrix elements and phase space. The simulation is performed using the VegasFlow and PDFFlow libraries which deploy automatically the full simulation on systems with different hardware acceleration capabilities, such as multi-threading CPU, single-GPU and multi-GPU setups. The package also provides an asynchronous unweighted events procedure to store simulation results. Crucially, although only Leading Order is automatized, the library provides all ingredients necessary to build full complex Monte Carlo simulators in a modern, extensible and maintainable way. We show simulation results at leading-order for multiple processes on different hardware configurations.
description: 7 pages, 4 figures, to appear at Off-Shell 2021, code available at https://github.com/N3PDF/madflow. arXiv admin note: text overlap with arXiv:2105.10529
Optimal Zeno Dragging for Quantum Control: A Shortcut to Zeno with Action-based Scheduling Optimization
Creators: name: Lewalle, Philippe
name: Zhang, Yipei
name: Whaley, K. Birgitta
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The quantum Zeno effect asserts that quantum measurements inhibit simultaneous unitary dynamics when the "collapse" events are sufficiently strong and frequent. This applies in the limit of strong continuous measurement or dissipation. It is possible to implement a dissipative control that is known as "Zeno Dragging", by dynamically varying the monitored observable, and hence also the eigenstates which are attractors under Zeno dynamics. This is similar to adiabatic processes, in that the Zeno dragging fidelity is highest when the rate of eigenstate change is slow compared to the measurement rate. We demonstrate here two theoretical methods for using such dynamics to achieve control of quantum systems. The first, which we shall refer to as "shortcut to Zeno" (STZ), is analogous to the shortcuts to adiabaticity (counterdiabatic driving) that are frequently used to accelerate unitary adiabatic evolution. In the second approach we apply the Chantasri Dressel Jordan (2013, CDJ) stochastic action, and demonstrate that the extremal-probability readout paths derived from this are well suited to setting up a Pontryagin-style optimization of the Zeno dragging schedule. A fundamental contribution of the latter approach is to show that an action suitable for measurement-driven control optimization can be derived quite generally from statistical arguments. Implementing these methods on the Zeno dragging of a qubit, we find that both approaches yield the same solution, namely, that the optimal control is a unitary that matches the motion of the Zeno-monitored eigenstate. We then show that such a solution can be more robust than a unitary-only operation, and comment on solvable generalizations of our qubit example embedded in larger systems. These methods open up new pathways toward systematically developing dynamic control of Zeno subspaces to realize dissipatively-stabilized quantum operations.
description: 24 + 13 pages, 8 figures. Comments welcome!
Modeling of water table profile for a subirrigation system and evaluation of reliability of drainmod for the Lower Fraser Valley
Creators: name: Agarwala, Shipra
Publisher: name: University of British Columbia
Year: 2008

description: Subsurface drainage and sub irrigation were simulated in the Lower Fraser Valley of British Columbia under different water regimes with DRAINMOD and the results were compared with data obtained from conventional subsurface drainage and subirrigation field experiment at Boundary Bay in the Lower Fraser Valley. Predicted and measured water table depth were compared for 4 years (1985, 1986, 1987 and 1988), where 1986 was a normal year from the total rainfall standpoint. Model simulations of water table depth were closer to the actual value of wet season. The model overestimated water storage capacity of the soil profile. For the drier than normal year, 1985, water table depth was over predicted as evapotranspiration was over predicted by the model. When rooting depth for the dry year was increased, soil water withdrawal by ET increased and predictions for water table depth were significantly improved. Laboratory experiment was performed to evaluate the shape of the water table under subirrigation and the time required for the profile to attain a stable state from a steady recharge. A slow transition from semi elliptical water table at the initiation of irrigation to a nearly flat water table profile at a stable state was observed. A linear relationship between capillary rise and water table elevation was observed.
On the Casimir effect for parallel plates in the spacetime with one extra compactified dimension
Creators: name: Cheng, Hongbo
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, the Casimir effect for parallel plates in the presence of one compactified universal extra dimension is reexamined in detail. Having regularized the expressions of Casimir force, we show that the nature of Casimir force is repulsive if the distance between the plates is large enough, which is disagree with the experimental phenomena.
description: 7 pages, 3 figures
Computation of the component group of an arbitrary real algebraic group
Creators: name: Timashev, Dmitry A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Group Theory (math.GR)
subject: Algebraic Geometry (math.AG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 14L40, 22E15 (Primary) 11E72, 20G20, 14K20 (Secondary)

description: We compute explicitly the group of connected components $π_0G(\mathbb{R})$ of the real Lie group $G(\mathbb{R})$ for an arbitrary (not necessarily linear) connected algebraic group $G$ defined over the field $\mathbb{R}$ of real numbers. In particular, it turns out that $π_0G(\mathbb{R})$ is always an elementary Abelian 2-group. The result looks most transparent in the cases where $G$ is a linear algebraic group or an Abelian variety. The computation is based on structure results on algebraic groups and Galois cohomology methods.
description: 10 pages, 2 figures
Diffuse optics for glaciology
Creators: name: Allgaier, Markus
name: Smith, Brian J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Optical probing of glaciers has the potential for tremendous impact on environmental science. However, glacier ice is turbid, which prohibits the use of most established optical measurements for determining a glacier's interior structure. Here, we propose a method for determining the depth, scattering and absorption length based upon diffuse propagation of short optical pulses. Our model allows us to extract several characteristics of the glacier. Performing Monte Carlo simulations implementing Mie scattering and mixed boundary conditions, we show that the proposed approach should be feasible with current technology. The results suggest that optical properties and geometry of the glacier can be extracted from realistic measurements, which could be implemented with low cost and small footprint.
The Long Sinuous Rille System in Northern Oceanus Procellarum and its Relation to the Chang'e-5 Returned Samples
Creators: name: Qian, Yuqi
name: Xiao, Long
name: Head, James W.
name: Wilson, Lionel
Publisher: name: Zenodo
Year: 2021
Subjects: Chang'e-5

description: This is a 2021 American Geophysical Union Fall Meeting (https://www.agu.org/Fall-Meeting) presentation, entitled "The Long Sinuous Rille System in Northern Oceanus Procellarum and its Relation to the Chang’e-5 Returned Samples" in Session P52A - The Science of Exploration: The Moon and Beyond II Oral. The abstract is available through: https://agu.confex.com/agu/fm21/meetingapp.cgi/Paper/959958. The video of this presentation has been uploaded to Youtube: https://youtu.be/Gi2eG8VQsHA American Geophysical Union Fall Meeting is the most influential event in the world dedicated to the advancement of Earth and space sciences. AGU21 happens between Dec. 13-17, 2021. Anyone use the slides anywhere for any purpose should cite this dataset or the corresponding AGU abstract. Questions and comments can be submitted to:
 Yuqi Qian
 School of Earth Sciences
 China University of Geosciences, Wuhan
 yuqii.qian@gmail.com or yuqi_qian@cug.edu.cn
description: {"references": ["Qian, Y., Xiao, L., Head, J.W., Wilson, L., 2021. The Long Sinuous Rille System in Northern Oceanus Procellarum and Its Relation to the Chang'e-5 Returned Samples. Geophys. Res. Lett. 48, e2021GL092663. https://doi.org/10.1029/2021GL092663"]}
Relationships between Superconductivity and Nematicity in FeSe$_{1-x}$Te$_x$ ($x=0-0.5$) Films Studied by Complex Conductivity Measurements
Creators: name: Kurokawa, H.
name: Nakamura, S.
name: Zhao, J.
name: Shikama, N.
name: Sakishita, Y.
name: Sun, Y.
name: Nabeshima, F.
name: Imai, Y.
name: Kitano, H.
name: Maeda, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We measured the complex conductivity, $σ$, of FeSe$_{1-x}$Te$_x$ ($x=0-0.5$) films in the superconducting state which show a drastic increase of the superconducting transition temperature, $T_\textrm{c}$, when the nematic order disappears. Since the magnetic penetration depth, $λ$ $(>$ 400 nm), of Fe(Se,Te) is longer than the typical thickness of the film ($\sim$100 nm), we combined the coplanar waveguide resonator and cavity perturbation techniques to evaluate both the real and imaginary parts of $σ$. Films with a nematic order showed a qualitatively different temperature dependence in penetration depth and quasiparticle scattering time when compared with those without nematic order, suggesting that nematic order influences the superconducting gap structure. Conversely, the proportionality between superfluid density, $n_\textrm{s}$ ($\proptoλ^{-2}$), and $T_\textrm{c}$ was observed irrespective of the presence or absence of nematic order. This result indicates that the amount of superfluid has a stronger impact on the $T_\textrm{c}$ of Fe(Se,Te) than the presence or absence of nematic order. Combining these results with band dispersions calculated using density functional theory, we propose that the change of the Fermi surface associated with nematicity is the primary factor influencing the change of $T_\textrm{c}$ and the superconducting gap structure in Fe(Se,Te).
description: 21 pages, 8 figures
Addomesticare la comunicazione accademica e quella istituzionale attraverso un video per il web
Creators: name: Mezzadri, Marco
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2012

description:

The aim of this article is to present the process of creation of a video, conceived mainly for online use, which has been designed to inform on a teaching and research project developed in 2010-2011 by Parma University, Provincia di Parma local authority, Cariparma Foundation, a network of highschools, and local school authorities.

description: EL.LE
Boundary quantum criticality in models of magnetic impurities coupled to bosonic baths
Creators: name: Florens, Serge
name: Fritz, Lars
name: Vojta, Matthias
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate quantum impurity problems, where a local magnetic moment is coupled to the spin density of a bosonic environment, leading to bosonic versions of the standard Kondo and Anderson impurity models. In a physical situation, these bosonic environments can correspond either to deconfined spinons in certain classes of Z_2 frustrated antiferromagnets, or to particles in a multicomponent Bose gase (in which case the spin degree of freedom is attributed to hyperfine levels). Using renormalization group techniques, we establish that our impurity models, which feature an exchange interaction analogous to Kondo impurities in Fermi liquids, allow the flow towards a stable strong-coupling state. Since the low-energy bosons live around a single point in momentum space, and there is no Fermi surface, an impurity quantum phase transition occurs at intermediate coupling, separating screened and unscreened phases. This behavior is qualitatively different from previously studied spin-isotropic variants of the spin-boson model, which display stable intermediate-coupling fixed points and no screening.
description: 15 pages, 10 figs
Helium enrichment during classical nova outbursts
Creators: name: Guo, Yunlang
name: Wu, Chengyuan
name: Wang, Bo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Nova outbursts play an important role in the chemical evolution of galaxies, especially they are the main source of synthetic $^{13}\rm C$, $^{15}\rm N$, $^{17}\rm O$ and some radioactive isotopes like $^{22}\rm Na$ and $^{26}\rm Al$. The enrichment of He in nova ejecta indicates that the accreted material may mix with the He-shell (He-mixing). The purpose of this work is to investigate how the He-mixing affects the nova outbursts in a systematic way. We evolved a series of accreting WD models, and found that the mass fraction of H and He in nova ejecta can be influenced by different He-mixing fractions significantly. We also found that both the nova cycle duration and ejected mass increase with the He-mixing fractions. Meanwhile, the nuclear energy production from $p$-$p$ chains decreases with the He-mixing fraction during the nova outbursts, whereas the CNO-cycle increases. The present work can reproduce the chemical abundances in the ejecta of some novae, such as GQ Mus, ASASSN-18fv, HR Del, T Aur and V443 Sct. This implies that the He-mixing process cannot be neglected when studying nova outbursts. This study also develops a He-mixing meter (i.e. $\rm He/H$) that can be used to estimate the He-mixing fraction in classical nova systems.
description: 15 pages, 9 figures, accepted by MNRAS, comments welcome!
Exciton lasing in carbon nanotubes below the population inversion threshold via phonon-mediated stimulated emission
Creators: name: Forno, Stefano Dal
name: Battiato, Marco
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Excitonic optical transitions in carbon nanotubes (CNTs) have been extensively studied for at least two decades. However, exploiting these transitions to produce a lasing effect has been proved unpractical due to the difficulties of achieving an excitonic population inversion in carbon nanotubes. In this work we show that lasing is theoretically possible at a much lower exciton population threshold by taking advantage of phonon stimulated emission. Specifically, the so-called Anti-Stokes transitions, where light is generated by the creation of a phonon and the annihilation of an exciton, can be used to sustain the coherent emission of photons. These transitions have been overlooked for long due to their low intensity as a consequence of the low occupancy of the associated phonon branches. We show that the best conditions to achieve the lasing effect are met in CNTs with i) excitons of non-zero momentum, ii) a strong exciton-phonon coupling and iii) narrow exciton transitions.
Homesite Discussions
Creators: name: Girado, Luther
name: Hammond, Jon
name: Hernandez, Betty
name: Hicks, Lucille
name: Grant, Laura
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: xaw

description: These recordings, divided into three segments and taken at a homesite, contain the speakers' recollections of their early memories from their home sites. Topics discussed include stories about parents and friends, specific places visited, and work done at home sites.
A survey on the Weierstrass approximation theorem
Creators: name: Perez, Dilcia
name: Quintana, Yamilet
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 41, 41A10, 43A32, 47A56

description: The celebrated and famous Weierstrass approximation theorem characterizes the set of continuous functions on a compact interval via uniform approximation by algebraic polynomials. This theorem is the first significant result in Approximation Theory of one real variable and plays a key role in the development of General Approximation Theory. Our aim is to investigate some new results relative to such theorem, to present a history of the subject, and to introduce some open problems.
description: 16 pages
Conversations in Car I
Creators: name: Grant, Laura
name: Hammond, Jon
name: Hernandez, Betty
name: Hicks, Josh
name: Hicks, Lucille
name: Turner, Julie
name: Everson, Merlene
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: xaw

description: These recordings contain a discussion between four speakers concerning their relationships and memories of the land and buildings around them encountered while on the drive, as well as experiences had with other members in their community near these places. The second recording in is a continuation of the first.
Lingua e contenuti disciplinari e/o trasversali attraverso il cinema
Creators: name: Serragiotto, Graziano
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2012

description:

The objective of this paper is to offer an original outlook onto the tools and benefits obtainable through the application of the CLIL methodology in the teaching of Italian as a foreign or second language within an overall teaching plan where both a foreign language and subject contents are delivered. Here is presented the added value this methodology can offer to all those professionals involved in enriching the body of knowledge developed through cinema with the purpose of creating better learning conditions and give rise to a teaching experience of greater effectiveness, thanks also to the fact that students discover different cultural values seen from different angles enabling them to interpret language phenomena with greater scope thanks to their socio-cultural outcome.

description: EL.LE
A disk and no signatures of tidal distortion in the galaxy "lacking" dark matter NGC 1052-DF2
Creators: name: Montes, Mireia
name: Trujillo, Ignacio
name: Infante-Sainz, Raúl
name: Monelli, Matteo
name: Borlaff, Alejandro S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Using ultra-deep imaging ($μ_g = 30.4$ mag/arcsec$^2$; 3$σ$, 10"x10"), we probed the surroundings of the first galaxy "lacking" dark matter KKS2000[04] (NGC 1052-DF2). Signs of tidal stripping in this galaxy would explain its claimed low content of dark matter. However, we find no evidence of tidal tails. In fact, the galaxy remains undisturbed down to a radial distance of 80 arcsec. This radial distance triples previous spatial explorations of the stellar distribution of this galaxy. In addition, the distribution of its globular clusters (GCs) is not extended in relation to the bulk of the galaxy (the radius containing half of the GCs is 21 arcsec). We also found that the surface brightness radial profiles of this galaxy in the g and r bands decline exponentially from 35 to 80 arcsec. That, together with a constant ellipticity and position angle in the outer parts of the galaxy strongly suggests the presence of a low-inclination disk. This is consistent with the evidence of rotation found for this object. This finding implies that the dynamical mass of this galaxy is a factor of 2 higher than previously reported, bringing the dark matter content of this galaxy in line with galaxies of similar stellar mass.
description: Accepted for publication in ApJ. The 1D profile of DF2, in Fig. 4 and 5, shows an exponential decline at r> 35 arcsec (disk). Fig. 7 shows no signatures of tidal features in the outer parts of the galaxy
Dynamical evolution of spinodal decomposition in holographic superfluids
Creators: name: Zhao, Xin
name: Zhao, Zi-Qiang
name: Nie, Zhang-Yu
name: Zeng, Hua-Bi
name: Tian, Yu
name: Baggioli, Matteo
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the nonlinear dynamical evolution of spinodal decomposition in a first-order superfluid phase transition using a simple holographic model in the probe limit. We first confirm the linear stability analysis based on quasinormal modes and verify the existence of a critical length scale related to a gradient instability -- negative speed of sound squared -- of the superfluid sound mode, which is a consequence of a negative thermodynamic charge susceptibility. We present a comparison between our case and the standard Cahn-Hilliard equation for spinodal instability, in which a critical length scale can be also derived based on a diffusive instability. We then perform several numerical tests which include the nonlinear time evolution directly from an unstable state and fast quenches from a stable to an unstable state in the spinodal region. Our numerical results provide a real time description of spinodal decomposition and phase separation in one and two spatial dimensions. We reveal the existence of four different stages in the dynamical evolution, and characterize their main properties. Finally, we investigate the strength of dynamical heterogeneity using the spatial variance of the local chemical potential and we correlate the latter to other features of the dynamical evolution.
description: 19 pages, 13 figures. A few typos have been corrected
Understanding father: adult sons look back
Creators: name: Adam, Bodhi D.
Publisher: name: University of British Columbia
Year: 2008

description: The present study explored the experience of relationship with father from the retrospective viewpoint of adult sons. Healing the father relationship has become an interest for many men and gender specific research in other fields of social enquiry has recently investigated the changing father role, yet in the social work and family therapy research literature, a lacuna was identified concerning the particulars of interpersonal relations with fathers. Twelve adult sons were asked to relate stories involving themselves and their fathers from progressive stages in their lives. Additional specific questioning sought the sons' perspectives on their relationships with father. Data was transcribed, qualitatively coded and grouped into 9 themes descriptive of father and son relations. Limitations of the study resulted from the small sample size, bias introduced by self selection and the problem of reliability of retrospective accounts, thus limiting the confidence with which findings can be generalized. Interviewing and analysis were guided by eclectic application of existing social science theory. Multiple levels of factors were found to characterize the relations between fathers and sons. Themes distinctly emerged which involved (i) personal dynamics of the relationship including rivalry, conflict and approval seeking, (ii) family concerns including the importance of mother, multigenerational patterns and developmental factors impacting on the relationship and, (iii) within the societal rubric, the experience of father as stranger, an image of him as hero and the role he engages in as provider. The primary clinical implications of the study are the confirmation of the importance of addressing the father relationship for adult men and the possibility of utilizing father as an opening into male emotionality. Future research will be required in order to confirm the salience of these themes by incorporating random designs, larger samples, multiple sources of evidence and cultural comparisons. This will also refine and focus an initial developmental model of father-son relations and longitudinal male psychological development which is proposed here.
Planar array of semiconducting nanotubes in external electric field: Collective screening and polarizability
Creators: name: Sedrakyan, T. A.
name: Mishchenko, E. G.
name: Raikh, M. E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study theoretically the charge separation in a planar array of semiconducting nanotubes (NTs) of length, 2h, placed in external electric field, F, parallel to their axes. By employing the conformal mapping, we find analytically the exact distribution of the induced charge density for arbitrary ratio of the gap, E_g, and the voltage drop, eFh, across the NT. We use the result obtained to (i) trace the narrowing of the neutral strip at center of the NT with increasing F; (ii) analyze the polarizability of the array as a function of E_g; (iii) study the field enhancement near the tips.
description: 9 pages, 5 figures, RevTex
On hyperbolic Coxeter polytopes with mutually intersecting facets
Creators: name: Felikson, Anna
name: Tumarkin, Pavel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Metric Geometry (math.MG)
subject: Combinatorics (math.CO)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 51F15; 51M20; 20F55

description: We prove that, apart from some well-known low-dimensional examples, any compact hyperbolic Coxeter polytope has a pair of disjoint facets. This is one of very few known general results concerning combinatorics of compact hyperbolic Coxeter polytopes. We also obtain a similar result for simple non-compact polytopes.
description: v3: accepted version, updated according to referee's comments. 37 pages, a lot of figures. To appear in J. Combinatorial Theory A
FIPLV
Creators: name: Cunningham, Denis
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2012

description:

The International Federation of Language Teacher Associations (FIPLV) is an international multilingual association of teachers of languages. Its aim is to promote the teaching and learning of languages and to make this teaching available to all. It has operational relations with UNESCO.

description: EL.LE
Convergence analysis of a primal-dual optimization-by-continuation algorithm
Creators: name: Loris, Ignace
name: Rebegoldi, Simone
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optimization and Control (math.OC)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 90C06, 90C25, 90C59, 90C90, 49M29, 65K10

description: We present a numerical iterative optimization algorithm for the minimization of a cost function consisting of a linear combination of three convex terms, one of which is differentiable, a second one is prox-simple and the third one is the composition of a linear map and a prox-simple function. The algorithm's special feature lies in its ability to approximate, in a single iteration run, the minimizers of the cost function for many different values of the parameters determining the relative weight of the three terms in the cost function. A proof of convergence of the algorithm, based on an inexact variable metric approach, is also provided. As a special case, one recovers a generalization of the primal-dual algorithm of Chambolle and Pock, and also of the proximal-gradient algorithm. Finally, we show how it is related to a primal-dual iterative algorithm based on inexact proximal evaluations of the non-smooth terms of the cost function.
description: 32 pages, 7 figures
Un viaggio nei Centri Linguistici universitari tra culture, linguaggi e curiosità
Creators: name: Argondizzo, Carmen
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2012

description:

Cultures, multilingualism, internationality are the keywords of a University Language Centre. Raising awareness of the relevant concepts conveyed by these words is a key role that University Language Centres play. Language Centres implement actions in favour of a multilingual and multicultural society and offer a contribution in the fields of didactic for language learning, ICT, research on linguistic and pedagogical issues, internationalization, autonomous learning, project planning, assessment of language competences. Yet, one of the most important objectives that Language Centres should pursue is cooperation among themselves. This can be easily created through a network of common actions aimed at transferring knowledge of languages and awareness of cultures to the new generation.

description: EL.LE
STUDY OF PHRASEOLOGICAL UNITS IN ENGLISH LINGUISTICS
Creators: name: Babaqulova, Oydin
Publisher: name: Zenodo
Year: 2023

description: This scientific article delves into the multifaceted realm of phraseological units in English linguistics. Phraseology, as a branch of linguistics, plays a pivotal role in understanding the intricate fabric of language, encapsulating the idiosyncrasies of expression and cultural nuances. Through an exhaustive exploration of various types of phraseological units, their origins, functions, and cultural implications, this study seeks to contribute to the broader understanding of the English language and its dynamic use in diverse contexts. This scientific article delves into the multifaceted realm of phraseological units within the domain of English linguistics.
Fingerprinting the presence of extra scalars in the $h \to Vff'$ forward-backward asymmetry
Creators: name: Ilisie, Victor
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work we analyse the forward-backward asymmetry of the $h\to Vff'$ decay in the Aligned two-Higgs Doublet Model. The Standard Model prediction for this asymmetry for $V=W$ is small, as it suffers from Yukawa suppression and is absent for $V=Z$. This does not necessarily have to hold true in the Aligned model where these contributions can in principle be re-enhanced through the independent alignment factors $ς_f$. In this analysis we conclude that, due to the additional contributions corresponding to the Aligned two-Higgs Doublet Model together with extra sources of CP-violation for the $V=Z$ channel, the Standard Model predictions can be significantly modified in a great region of the parameter space. These deviations, that could be potentially measured at the High Luminosity LHC or future Higgs factories, would be a clear signal of new physics, and would shed new light on the possible extensions of the Standard Model and new sources of CP-violation.
description: 25 pages, 7 figures. Minor changes made, references updated, some parts of the calculation have been moved to appendices. Matches version to be published in JHEP
The one-loop tadpole in the geoSMEFT
Creators: name: Corbett, T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Making use of the geometric formulation of the Standard Model Effective Field Theory we calculate the one-loop tadpole diagrams to all orders in the Standard Model Effective Field Theory power counting. This work represents the first calculation of a one-loop amplitude beyond leading order in the Standard Model Effective Field Theory, and discusses the potential to extend this methodology to perform similar calculations of observables in the near future.
description: 15 pages (+ appendix + bibliography), 1 Figure
Nonanalyticities of the entropy induced by saddle points of the potential energy landscape
Creators: name: Kastner, Michael
name: Schnetz, Oliver
name: Schreiber, Steffen
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The relation between saddle points of the potential of a classical many-particle system and the analyticity properties of its Boltzmann entropy is studied. For finite systems, each saddle point is found to cause a nonanalyticity in the Boltzmann entropy, and the functional form of this nonanalytic term is derived for the generic case of potentials having the Morse property. With increasing system size the order of the nonanalytic term grows unboundedly, leading to an increasing differentiability of the entropy. Nonetheless, a distribution of an unboundedly growing number of saddle points may cause a phase transition in the thermodynamic limit. Analyzing the contribution of the saddle points to the density of states in the thermodynamic limit, conditions on the distribution of saddle points and their curvatures are derived which are necessary for a phase transition to occur. With these results, the puzzling absence of topological signatures in the spherical model is elucidated. As further applications, the phase transitions of the mean-field XY model and the mean-field k-trigonometric model are shown to be induced by saddle points of vanishing curvature.
description: 24 pages, 2 figures
title: La natura di una rivista multimediale
title: Intervista a Carlos Melero
titleType: Subtitle
Creators: name: Caon, Fabio
Publisher: name: Edizioni Ca' Foscari - Digital Publishing
Year: 2012

description: The International Federation of Language Teacher Associations (FIPLV) is an international multilingual association of teachers of languages. Its aim is to promote the teaching and learning of languages and to make this teaching available to all. It has operational relations with UNESCO.
description: EL.LE, 1 | 1 | 2012
Black film can inhibit steroidal glycoalkaloid accumulation during potato growth
Creators: name: Nie, Xuheng
name: Zhang, Guanghai
name: Yang, Shuiyan
name: Bai, Lei
name: Wen, Yunman
name: Sun, Jinghan
name: Guo, Huachun
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Hematology
subject: Plant Biology

description: Potato is rich in nutrition, and can be vital in improving and enriching the diets of people. However, potatoes contain a natural secondary metabolite group, steroidal glycoalkaloids (SGAs), which can cause human and animal toxicity at higher levels. In this study, we investigated the inhibition effect of film on SGA concentration in tuber during potato growth via a pot experiment in 2016 and a field experiment in 2017. Tubers were sampled every 15 days from flowering to harvest in the pot experiment, and were sampled after harvest in field experiment. The results showed that SGA concentration decreased gradually with the enlargement and maturation of potato tubers. In contrast to blank and white film treatments, the inhibition effect of black film on SGA concentration in tuber was remarkable, while the tuber yield per plant was similar between treatments. In the field experiment, the tuber SGA concentration mulching black film was significantly lower than that mulching white film and blank treatments, while the tuber yield per plant mulching black film among them was comparable. These results suggest that black film may be applied to the production to inhibit SGA concentration accumulation during growth, which is important for consuming potato tubers safely.
Higher-Order Termination: from Kruskal to Computability
Creators: name: Blanqui, Frédéric
name: Jouannaud, Jean-Pierre
name: Rubio, Albert
Publisher: name: arXiv
Year: 2006
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: Termination is a major question in both logic and computer science. In logic, termination is at the heart of proof theory where it is usually called strong normalization (of cut elimination). In computer science, termination has always been an important issue for showing programs correct. In the early days of logic, strong normalization was usually shown by assigning ordinals to expressions in such a way that eliminating a cut would yield an expression with a smaller ordinal. In the early days of verification, computer scientists used similar ideas, interpreting the arguments of a program call by a natural number, such as their size. Showing the size of the arguments to decrease for each recursive call gives a termination proof of the program, which is however rather weak since it can only yield quite small ordinals. In the sixties, Tait invented a new method for showing cut elimination of natural deduction, based on a predicate over the set of terms, such that the membership of an expression to the predicate implied the strong normalization property for that expression. The predicate being defined by induction on types, or even as a fixpoint, this method could yield much larger ordinals. Later generalized by Girard under the name of reducibility or computability candidates, it showed very effective in proving the strong normalization property of typed lambda-calculi...
He I 10830 Å Dimming During Solar Flares, I. The Crucial Role of Non-Thermal Collisional Ionisations
Creators: name: Kerr, Graham S.
name: Xu, Yan
name: Allred, Joel C.
name: Polito, Vanessa
name: Sadykov, Viacheslav M.
name: Huang, Nengyi
name: Wang, Haimin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: While solar flares are predominantly characterised by an intense broadband enhancement to the solar radiative output, certain spectral lines and continua will, in theory, exhibit flare-induced dimmings. Observations of transitions of orthohelium He I $λλ10830$Å and the He I D3 lines have shown evidence of such dimming, usually followed by enhanced emission. It has been suggested that non-thermal collisional ionisation of helium by an electron beam, followed by recombinations to orthohelium, is responsible for overpopulating the those levels, leading to stronger absorption. However it has not been possible observationally to preclude the possibility of overpopulating orthohelium via enhanced photoionisation of He I by EUV irradiance from the flaring corona followed by recombinations. Here we present radiation hydrodynamics simulations of non-thermal electron beam-driven flares where (1) both non-thermal collisional ionisation of Helium and coronal irradiance are included, and (2) only coronal irradiance is included. A grid of simulations covering a range of total energies deposited by the electron beam, and a range of non-thermal electron beam low-energy cutoff values, were simulated. In order to obtain flare-induced dimming of the He I 10830Å line it was necessary for non-thermal collisional ionisations to be present. The effect was more prominent in flares with larger low-energy cutoff values and longer lived in weaker flares and flares with a more gradual energy deposition timescale. These results demonstrate the usefulness of orthohelium line emission as a diagnostic of flare energy transport.
description: 18 pages, 17 figures, accepted for publication in The Astrophysical Journal
A Geometric Tension Dynamics Model of Epithelial Convergent Extension
Creators: name: Claussen, Nikolas H.
name: Brauns, Fridtjof
name: Shraiman, Boris I.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Convergent extension of epithelial tissue is a key motif of animal morphogenesis. On a coarse scale, cell motion resembles laminar fluid flow; yet in contrast to a fluid, epithelial cells adhere to each other and maintain the tissue layer under actively generated internal tension. To resolve this apparent paradox, we formulate a model in which tissue flow in the tension-dominated regime occurs through adiabatic remodeling of force balance in the network of adherens junctions. We propose that the slow dynamics within the manifold of force-balanced configurations is driven by positive feedback on myosin-generated cytoskeletal tension. Shifting force balance within a tension network causes active cell rearrangements (T1 transitions) resulting in net tissue deformation oriented by initial tension anisotropy. Strikingly, we find that the total extent of tissue deformation depends on the initial cellular packing order. T1s degrade this order so that tissue flow is self-limiting. We explain these findings by showing that coordination of T1s depends on coherence in local tension configurations, quantified by a geometric order parameter in tension space. Our model reproduces the salient tissue- and cell-scale features of germ band elongation during Drosophila gastrulation, in particular the slowdown of tissue flow after approximately twofold longation concomitant with a loss of order in tension configurations. This suggests local cell geometry contains morphogenetic information and yields experimentally testable predictions. Defining biologically controlled active tension dynamics on the manifold of force-balanced states may provide a general approach to the description of morphogenetic flow.
description: Revised version, 47 pages, 22 figures
Dislessia evolutiva
Creators: name: Melero Rodríguez, Carlos Alberto
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2012

description:

With the Law 170/2010 (Italian B.O.E. n. 244 18th October 2010) Nuove norme in materia di disturbi specifici di apprendimento in ambito scolastico (New rules about specific learning difficulties in the teaching environment), a new obligation for the schools is included. They need to adapt the art of teaching and the assessment to these difficulties. Adding if necessary compensatory tools, granting activities or partial syllabus dispensation. This obligation is also extended to the universities (art. 5). This work will try to show the most suitable computer compensatory tools for the teaching and learning process of a foreign language. But first, a neurolinguistic and psychological frame will be outlined so that it can be used to choose from such tools.

description: EL.LE
Determination of the mass function of extra-galactic GMCs via NIR color maps. Testing the method in a disk-like geometry
Creators: name: Kainulainen, Jouni
name: Juvela, Mika
name: Alves, Joao
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: [Abridged] The giant molecular clouds (GMCs) of external galaxies can be mapped with sub-arcsecond resolution using multiband observations in the near-infrared. However, the interpretation of the observed features, and their transformation into physical quantities, is greatly hampered by the effects arising from the unknown geometry and the scattering of light by dust particles. We examine the relation between the observed NIR reddening and the column density of the dust clouds. In this paper we particularly assess the feasibility of deriving the mass function of GMCs from NIR color-excess data. We perform Monte Carlo radiative transfer simulations with 3D models of stellar radiation and clumpy dust distributions. We include the scattered light in the models and calculate NIR color maps from the simulated data. We extract clumps from the color maps and compare the observed mass function to the true mass function. For the physical configuration chosen in this study, essentially a face-on geometry, the observed mass function is a non-trivial function of the true mass function. The dynamical range of the observed mass function is confined to ~10^3.5... 10^5.5 M_\odot regardless of the dynamical range of the true mass function. The color maps are more sensitive in detecting the high-mass end of the mass function, and on average the masses of clouds are underestimated by a factor of ~10. The simulations show that the cloud mass function derived from JHK color excess data using simple foreground screening geometry cannot be regarded as a one-to-one tracer of the underlying mass function.
description: 5 pages, 3 figures, accepted for publication in A&A