cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Limits on Polarized Dust Spectral Index Variations for CMB Foreground Analysis
Creators: name: Osumi, Keisuke
name: Weiland, Janet L.
name: Addison, Graeme E.
name: Bennett, Charles L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Using Planck polarization data, we search for and constrain spatial variations of the polarized dust foreground for cosmic microwave background (CMB) observations, specifically in its spectral index, $β_d$. Failure to account for such variations will cause errors in the foreground cleaning that propagate into errors on cosmological parameter recovery from the cleaned CMB map. It is unclear how robust prior studies of the Planck data which constrained $β_d$ variations are due to challenges with noise modeling, residual systematics, and priors. To clarify constraints on $β_d$ and its variation, we employ two pixel space analyses of the polarized dust foreground at $>3.7^{\circ}$ scales on $\approx 60\%$ of the sky at high Galactic latitudes. A template fitting method, which measures $β_d$ over three regions of $\approx 20\%$ of the sky, does not find significant deviations from an uniform $β_d = 1.55$, consistent with prior Planck determinations. An additional analysis in these regions, based on multifrequency fits to a dust and CMB model per pixel, puts limits on $σ_{β_d}$, the Gaussian spatial variation in $β_d$. At the highest latitudes, the data support $σ_{β_d}$ up to $0.45$, $0.30$ at mid-latitudes, and $0.15$ at low-latitudes. We also demonstrate that care must be taken when interpreting the current Planck constraints, $β_d$ maps, and noise simulations. Due to residual systematics and low dust signal to noise at high latitudes, forecasts for ongoing and future missions should include the possibility of large values of $σ_{β_d}$ as estimated in this paper, based on current polarization data.
description: 17 pages, 10 figures, 4 tables, version accepted by ApJ
title: UniCA PhD Book XXXV Cycle
Creators: name: Sergioli, Giuseppe
Publisher: name: UNICApress
Year: 2024

description: This volume reports, in brief, the experience of the students enrolled in the XXXV cycle of the PhD courses at the University of Cagliari. The contributions are grouped by course and are preceded by a presentation of the coordinators of each PhD program. In two pages each student gives the reader an idea of his/her personal experience and of the results of his/her research.
Tracing the large-scale magnetic field morphology in protoplanetary disks using molecular line polarization
Creators: name: Lankhaar, Boy
name: Vlemmings, Wouter
name: Bjerkeli, Per
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: (abridged) Magnetic fields are fundamental to the accretion dynamics of protoplanetary disks and they likely affect planet formation. Typical methods to study the magnetic field morphology observe the polarization of dust or spectral lines. However, it has recently become clear that dust-polarization in ALMA's spectral regime does not always faithfully trace the magnetic field structure of protoplanetary disks, which leaves spectral line polarization as a promising method for mapping the magnetic field morphologies of such sources. We aim to model the emergent polarization of different molecular lines in the ALMA wavelength regime that are excited in protoplanetary disks. We explore a variety of disk models and molecules to identify those properties that are conducive to the emergence of polarization in spectral lines and may therefore be viably used for magnetic field measurements in protoplanetary disks. We used PORTAL in conjunction with LIME. Together, they allowed us to treat the polarized line radiative transfer of complex three-dimensional physical and magnetic field structures. We present simulations of the emergence of spectral line polarization of different molecules and molecular transitions in the ALMA wavelength regime. We find that molecules that thermalize at high densities, such as HCN, are also the most susceptible to polarization. We find that such molecules are expected to be significantly polarized in protoplanetary disks, while molecules that thermalize at low densities, such as CO, are only significantly polarized in the outer disk regions. We present the simulated polarization maps at a range of inclinations and magnetic field morphologies, and we comment on the observational feasibility of ALMA linear polarization observations of protoplanetary disks.
description: Accepted to A&A
Many-body wave scattering by small bodies and applications
Creators: name: Ramm, A. G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 35J05, 35J10, 70F10, 74J25, 81U40, 81V05

description: A rigorous reduction of the many-body wave scattering problem to solving a linear algebraic system is given bypassing solving the usual system of integral equation. The limiting case of infinitely many small particles embedded into a medium is considered and the limiting equation for the field in the medium is derived. The impedance boundary conditions are imposed on the boundaries of small bodies. The case of Neumann boundary conditions (acoustically hard particles) is also considered. Applications to creating materials with a desired refraction coefficient are given. It is proved that by embedding suitable number of small particles per unit volume of the original material with suitable boundary impedances one can create a new material with any desired refraction coefficient. The governing equation is a scalar Helmholtz equation, which one obtains by Fourier transforming the wave equation.
Quantum Parrondo's game with random strategies
Creators: name: Kosik, J.
name: Miszczak, J. A.
name: Buzek, V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a quantum implementation of Parrondo's game with randomly switched strategies using 1) a quantum walk as a source of ``randomness'' and 2) a completely positive (CP) map as a randomized evolution. The game exhibits the same paradox as in the classical setting where a combination of two losing strategies might result in a winning strategy. We show that the CP-map scheme leads to significantly lower net gain than the quantum walk scheme.
(:unav)
Creators: name: (:Unav)
Publisher: name: Polish Academy of Sciences Committee of Electronics and Telecommunications
Year: 2020

description: International Journal of Electronics and Telecommunications (IJET, eISSN 2300-1933, untill 2013 also print ISSN 2081-8491) is a periodical of Electronics and Telecommunications Committee of Polish Academy of Sciences and it is published by Warsaw Science Publishers of PAS. It continues tradition of the Electronics and Telecommunications Quarterly (ISSN 0867-6747) established in 1955 as the Rozprawy Elektrotechniczne. The IJET is a scientific periodical where papers present the results of original, theoretical, experimental and reviewed works. They consider widely recognized aspects of modern electronics, telecommunications, microelectronics, optoelectronics, radioelectronics and medical electronics. The authors are outstanding scientists, well‐known experienced specialists as well as young researchers – mainly candidates for a doctor's degree. The papers present original approaches to problems, interesting research results, critical estimation of theories and methods, discuss current state or progress in a given branch of technology and describe development prospects. All the papers published in IJET are reviewed by international specialists who ensure that the publications are recognized as author's scientific output. The printed periodical is distributed among all those who deal with electronics and telecommunications in national scientific centers as well as in numeral foreign institutions, and it is subscribed by many specialists and libraries. Its electronic version is available at http://ijet.pl. The papers received are published within half a year if the cooperation between author and the editorial staff is efficient. The papers may be submitted to the editorial office by the journal web page http://ijet.pl.
Improving Stellar and Planetary Parameters of Transiting Planet Systems: The Case of TrES-2
Creators: name: Sozzetti, A.
name: Torres, G.
name: Charbonneau, D.
name: Latham, D. W.
name: Holman, M. J.
name: Winn, J. N.
name: Laird, J. B.
name: O'Donovan, F. T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on a spectroscopic determination of the atmospheric parameters and chemical abundance of the parent star of the recently discovered transiting planet {TrES-2}. A detailed LTE analysis of a set of \ion{Fe}{1} and \ion{Fe}{2} lines from our Keck spectra yields $T_\mathrm{eff} = 5850\pm 50$ K, $\log g = 4.4\pm 0.1$, and [Fe/H] $= -0.15\pm 0.10$. Several independent checks (e.g., additional spectroscopy, line-depth ratios) confirm the reliability of our spectroscopic $T_\mathrm{eff}$ estimate. The mass and radius of the star, needed to determine the properties of the planet, are traditionally inferred by comparison with stellar evolution models using $T_\mathrm{eff}$ and some measure of the stellar luminosity, such as the spectroscopic surface gravity (when a trigonometric parallax is unavailable, as in this case). We apply here a new method in which we use instead of $\log g$ the normalized separation $a/R_\star$ (related to the stellar density), which can be determined directly from the light curves of transiting planets with much greater precision. With the $a/R_\star$ value from the light curve analysis of Holman et al. \citeyearpar{holman07b} and our $T_\mathrm{eff}$ estimate we obtain $M_\star = 0.980\pm0.062 M_\odot$ and $R_\star = 1.000_{-0.033}^{+0.036} R_\odot$, and an evolutionary age of $5.1^{+2.7}_{-2.3}$ Gyr, in good agreement with other constraints based on the strength of the emission in the \ion{Ca}{2} H & K line cores, the Lithium abundance, and rotation. The new stellar parameters yield improved values for the planetary mass and radius of $M_p = 1.198 \pm 0.053 M_\mathrm{Jup}$ and $R_p = 1.220^{+0.045}_{-0.042} R_\mathrm{Jup}$, confirming that {TrES-2} is the most massive among the currently known nearby ($d\lesssim 300$ pc) transiting hot Jupiters. [Abridged]
description: 27 pages, 5 figures, 1 table. Accepted for publication in the Astrophysical Journal
Dynamics of nonlocal and local discrete Ginzburg-Landau equations: global attractors and their congruence
Creators: name: Hennig, Dirk
name: Karachalios, Nikos I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Discrete Ginzburg-Landau (DGL) equations with non-local nonlinearities have been established as significant inherently discrete models in numerous physical contexts, similar to their counterparts with local nonlinear terms. We study two prototypical examples of non-local and local DGLs on the one-dimensional infinite lattice. For the non-local DGL, we identify distinct scenarios for the asymptotic behavior of the globally existing in time solutions depending on certain parametric regimes. One of these scenarios is associated with a restricted compact attractor according to J. K. Hale's definition. We also prove the closeness of the solutions of the two models in the sense of a "continuous dependence on their initial data" in the $l^2$ metric under general conditions on the intrinsic linear gain or loss incorporated in the model. As a consequence of the closeness results, in the dissipative regime we establish the congruence of the attractors possessed by the semiflows of the non-local and of the local model respectively, for initial conditions in a suitable domain of attraction defined by the non-local system.
description: 18 pages, 1 figure. To appear in Nonlinear Analysis (2022)
p-Adic Modelling of the Genome and the Genetic Code
Creators: name: Dragovich, Branko
name: Dragovich, Alexandra
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Quantitative Biology (q-bio.OT)
subject: Information Theory (cs.IT)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: The present paper is devoted to foundations of p-adic modelling in genomics. Considering nucleotides, codons, DNA and RNA sequences, amino acids, and proteins as information systems, we have formulated the corresponding p-adic formalisms for their investigations. Each of these systems has its characteristic prime number used for construction of the related information space. Relevance of this approach is illustrated by some examples. In particular, it is shown that degeneration of the genetic code is a p-adic phenomenon. We have also put forward a hypothesis on evolution of the genetic code assuming that primitive code was based on single nucleotides and chronologically first four amino acids. This formalism of p-adic genomic information systems can be implemented in computer programs and applied to various concrete cases.
description: 26 pages. Submitted to the Computer Journal for a special issue
Multiple scalar particle decay and perturbation generation
Creators: name: Choi, Ki-Young
name: Gong, Jinn-Ouk
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the evolution of the universe which contains a multiple number of non-relativistic scalar fields decaying into both radiation and pressureless matter. We present a powerful analytic formalism to calculate the matter and radiation curvature perturbations, and find that our analytic estimates agree with full numerical results within an error of less than one percent. Also we discuss the isocurvature perturbation between matter and radiation components, which may be detected by near future cosmological observations, and point out that it crucially depends on the branching ratio of the decay rate of the scalar fields and that it is hard to make any model independent predictions.
description: (v1) 22 pages, 4 figures, 2 tables; (v2) JHEP3 style, 24 pages, references added and typos corrected, to appear in JCAP
PHOTOS Monte Carlo for precision simulation of QED in decays - History and properties of the project
Creators: name: Was, Z.
name: Golonka, P.
name: Nanava, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Because of properties of QED, the bremsstrahlung corrections to decays of particles or resonances can be calculated, with a good precision, separately from other effects. Thanks to the widespread use of event records such calculations can be embodied into a separate module of Monte Carlo simulation chains, as used in High Energy Experiments of today. The PHOTOS Monte Carlo program is used for this purpose since nearly 20 years now. In the following talk let us review the main ideas and constraints which shaped the program version of today and enabled it widespread use. We will concentrate specially on conflicting requirements originating from the properties of QED matrix elements on one side and degrading (evolving) with time standards of event record(s). These issues, quite common in other modular software applications, become more and more difficult to handle as precision requirements become higher.
description: Prepared for XI International Workshop on Advanced Computing and Analysis Techniques in Physics Research, Amsterdam, the Netherlands, April 23 2007
Temperature Effect on the Growth Rate and Physical Characteristics of SnO2 Thin Films Grown by Atomic Layer Deposition
Creators: name: Daeho, Kim
name: Ha, Kim Dong
name: Doh-Hyung, Riu
name: Joon, Choi Byung
Publisher: name: Institute of Metallurgy and Materials Science of Polish Academy of Sciences
Year: 2018
Subjects: tin oxide
atomic layer deposition
optical band gap
growth rate
film density

description: Among the various thin film coating techniques, atomic layer deposition (ALD) has features of good controllability of the thickness, excellent step-coverage in 3-dimensional object even in the sub-nm thickness range at the relatively low deposition temperature. In this study, SnO2 thin films were grown by ALD in the variation of substrate temperatures from 150 to 250°C. Even such a low temperature may influence on the growth kinetics of the ALD reaction and thus the physical characteristics of thin films, such as crystallinity, film density and optical band gap, etc. We observed the decrease of the growth rate with increasing substrate temperature, at the same time, the density of the film was decreased with increasing temperature. Steric hindrance effect of the precursor molecule was attributed to the inverse relationship of the growth temperature and growth rate as well as the film density. Optical indirect band gap energy (~3.6 eV) of the ALD-grown amorphous SnO2 films grown at 150°C was similar with that of the literature value, while slightly lower band gap energy (~3.4 eV) was acquired at the films grown at higher temperature.
Quantum optical coherence: From linear to nonlinear interferometers
Creators: name: Luo, K. -H.
name: Santandrea, M.
name: Stefszky, M.
name: Sperling, J.
name: Massaro, M.
name: Ferreri, A.
name: Sharapova, P. R.
name: Herrmann, H.
name: Silberhorn, C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Interferometers provide a highly sensitive means to investigate and exploit the coherence properties of light in metrology applications. However, interferometers come in various forms and exploit different properties of the optical states within. In this paper, we introduce a classification scheme that characterizes any interferometer based on the number of involved nonlinear elements by studying their influence on single-photon and photon-pair states. Several examples of specific interferometers from these more general classes are discussed, and the theory describing the expected first-order and second-order coherence measurements for single-photon and single-photon-pair input states is summarized and compared. These theoretical predictions are then tested in an innovative experimental setup that is easily able to switch between implementing an interferometer consisting of only one or two nonlinear elements. The resulting singles and coincidence rates are measured in both configurations and the results are seen to fit well with the presented theory. The measured results of coherence are tied back to the presented classification scheme, revealing that our experimental design can be useful in gaining insight into the properties of the various interferometeric setups containing different degrees of nonlinearity.
description: 12 pages, 5 figures
Partial Thermal Condensation Mediated Synthesis of High-Density Nickel Single Atom Sites on Carbon Nitride for Selective Photooxidation of Methane into Methanol
Creators: name: Kumar, Pawan
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 340102
subject: Bioassays
classificationCode: 340103
subject: Electroanalytical chemistry
classificationCode: 340109
subject: Separation science
classificationCode: 340108
subject: Sensor technology (incl. chemical aspects)
classificationCode: 340106
subject: Metabolomic chemistry
classificationCode: 340107
subject: Quality assurance, chemometrics, traceability and metrological chemistry
classificationCode: 340105
subject: Instrumental methods (excl. immunological and bioassay methods)

description: Direct selective transformation of greenhouse methane (CH4) to liquid oxygenates (methanol) can substitute energy-intensive two-step (reforming/Fischer–Tropsch) synthesis while creating environmental benefits. The development of inexpensive, selective, and robust catalysts that enable room temperature conversion will decide the future of this technology. Single-atom catalysts (SACs) with isolated active centers embedded in support have displayed significant promises in catalysis to drive challenging reactions. Herein, high-density Ni single atoms are developed and stabilized on carbon nitride (NiCN) via thermal condensation of preorganized Ni-coordinated melem units. The physicochemical characterization of NiCN with various analytical techniques including HAADF-STEM and X-ray absorption fine structure (XAFS) validate the successful formation of Ni single atoms coordinated to the heptazine-constituted CN network. The presence of uniform catalytic sites improved visible absorption and carrier separation in densely populated NiCN SAC resulting in 100% selective photoconversion of (CH4) to methanol using H2O2 as an oxidant. The superior catalytic activity can be attributed to the generation of high oxidation (NiIII═O) sites and selective C─H bond cleavage to generate •CH3 radicals on Ni centers, which can combine with •OH radicals to generate CH3OH.
Fidelity approach to quantum phase transitions: finite size scaling for quantum Ising model in a transverse field
Creators: name: Zhou, Huan-Qiang
name: Zhao, Jian-Hui
name: Li, Bo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We analyze the scaling parameter, extracted from the fidelity for two different ground states, for the one-dimensional quantum Ising model in a transverse field near the critical point. It is found that, in the thermodynamic limit, the scaling parameter is singular, and the derivative of its logarithmic function with respect to the transverse field strength is logarithmically divergent at the critical point. The scaling behavior is confirmed numerically by performing a finite size scaling analysis for systems of different sizes, consistent with the conformal invariance at the critical point. This allows us to extract the correlation length critical exponent, which turns out to be universal in the sense that the correlation length critical exponent does not depend on either the anisotropic parameter or the transverse field strength.
description: 5 pages, 5 figures
Informative and Representative Triplet Selection for Multilabel Remote Sensing Image Retrieval
Creators: name: Sumbul, Gencer
name: Ravanbakhsh, Mahdyar
name: Demir, Begüm
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Learning the similarity between remote sensing (RS) images forms the foundation for content-based RS image retrieval (CBIR). Recently, deep metric learning approaches that map the semantic similarity of images into an embedding (metric) space have been found very popular in RS. A common approach for learning the metric space relies on the selection of triplets of similar (positive) and dissimilar (negative) images to a reference image called as an anchor. Choosing triplets is a difficult task particularly for multi-label RS CBIR, where each training image is annotated by multiple class labels. To address this problem, in this paper we propose a novel triplet sampling method in the framework of deep neural networks (DNNs) defined for multi-label RS CBIR problems. The proposed method selects a small set of the most representative and informative triplets based on two main steps. In the first step, a set of anchors that are diverse to each other in the embedding space is selected from the current mini-batch using an iterative algorithm. In the second step, different sets of positive and negative images are chosen for each anchor by evaluating the relevancy, hardness and diversity of the images among each other based on a novel strategy. Experimental results obtained on two multi-label benchmark archives show that the selection of the most informative and representative triplets in the context of DNNs results in: i) reducing the computational complexity of the training phase of the DNNs without any significant loss on the performance; and ii) an increase in learning speed since informative triplets allow fast convergence. The code of the proposed method is publicly available at https://git.tu-berlin.de/rsim/image-retrieval-from-triplets.
description: Accepted at the IEEE Transactions on Geoscience and Remote Sensing. Our code is available online at https://git.tu-berlin.de/rsim/image-retrieval-from-triplets
Time-dependent density functional study of the electronic spectra of oligoacenes in the charge states -1, 0, +1, and +2
Creators: name: Malloci, G.
name: Mulas, G.
name: Cappellini, G.
name: Joblin, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We present a systematic theoretical study of the five smallest oligoacenes (naphthalene, anthracene, tetracene, pentacene, and hexacene) in their anionic,neutral, cationic, and dicationic charge states. We used density functional theory (DFT) to obtain the ground-state optimised geometries, and time-dependent DFT (TD-DFT) to evaluate the electronic absorption spectra. Total-energy differences enabled us to evaluate the electron affinities and first and second ionisation energies, the quasiparticle correction to the HOMO-LUMO energy gap and an estimate of the excitonic effects in the neutral molecules. Electronic absorption spectra have been computed by combining two different implementations of TD-DFT: the frequency-space method to study general trends as a function of charge-state and molecular size for the lowest-lying in-plane long-polarised and short-polarised $π\toπ^\star$ electronic transitions, and the real-time propagation scheme to obtain the whole photo-absorption cross-section up to the far-UV. Doubly-ionised PAHs are found to display strong electronic transitions of $π\toπ^\star$ character in the near-IR, visible, and near-UV spectral ranges, like their singly-charged counterparts. While, as expected, the broad plasmon-like structure with its maximum at about 17-18 eV is relatively insensitive to the charge-state of the molecule, a systematic decrease with increasing positive charge of the absorption cross-section between about 6 and about 12 eV is observed for each member of the class.
description: 38 pages, 11 figures, 7 tables, accepted for publication in Chemical Physics
Experimental Decoy Quantum Key Distribution Up To 130KM Fiber
Creators: name: Yin, Zhen-Qiang
name: Han, Zheng-Fu
name: Chen, Wei
name: Xu, Fang-Xing
name: Wu, Qing-Lin
name: Guo, Guang-Can
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Decoy State Quantum Key Distribution (QKD), being capable of beating PNS attack and uncon- ditionally secure, have become an attractive one recently. But, in many QKD systems, disturbances of transmission channel make quantum bit error rate (QBER) increase which limits both security distance and key bit rate of real-life decoy state QKD systems. We demonstrate the two-intensity decoy QKD with one-way Faraday-Michelson phase modulation system, which is free of channel dis- turbance and keeps interference fringe visibility (99%) long period, near 130KM single mode optical fiber in telecom (1550 nm) wavelength. This is longest distance fiber decoy state QKD system based on two intensity protocol.
description: 4 pages, 2figures
From endomorphisms to bi-skew braces, regular subgroups, the Yang--Baxter equation, and Hopf--Galois structures
Creators: name: Caranti, A.
name: Stefanello, L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Group Theory (math.GR)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 20B05 20D45 12F10 20N99 16T05 16T25

description: The interplay between set-theoretic solutions of the Yang--Baxter equation of Mathematical Physics, skew braces, regular subgroups, and Hopf--Galois structures has spawned a considerable body of literature in recent years. In a recent paper, Alan Koch generalised a construction of Lindsay N.~Childs, showing how one can obtain bi-skew braces $(G, \cdot, \circ)$ from an endomorphism of a group $(G, \cdot)$ whose image is abelian. In this paper, we characterise the endomorphisms of a group $(G, \cdot)$ for which Koch's construction, and a variation on it, yield (bi-)skew braces. We show how the set-theoretic solutions of the Yang--Baxter equation derived by Koch's construction carry over to our more general situation, and discuss the related Hopf--Galois structures.
description: v1 of this manuscript has been split in two. The first part has appeared in J. Algebra 587 (2021), 462-487, and carries a slightly revised title - it is v2 here (19 pages). The second part is now arXiv:2110.11028
Arrival Time Statistics in Global Disease Spread
Creators: name: Gautreau, Aurelien
name: Barrat, Alain
name: Barthelemy, Marc
Publisher: name: arXiv
Year: 2007
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: Metapopulation models describing cities with different populations coupled by the travel of individuals are of great importance in the understanding of disease spread on a large scale. An important example is the Rvachev-Longini model [{\it Math. Biosci.} {\bf 75}, 3-22 (1985)] which is widely used in computational epidemiology. Few analytical results are however available and in particular little is known about paths followed by epidemics and disease arrival times. We study the arrival time of a disease in a city as a function of the starting seed of the epidemics. We propose an analytical Ansatz, test it in the case of a spreading on the world wide air transportation network, and show that it predicts accurately the arrival order of a disease in world-wide cities.
A critical assessment of the applicability of the energy-limited approximation for estimating exoplanetary mass-loss rates
Creators: name: Krenn, Andreas F.
name: Fossati, Luca
name: Kubyshkina, Daria
name: Lammer, Helmut
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Context: The energy-limited (EL) atmospheric escape approach is used to estimate mass-loss rates for a broad range of planets that host hydrogen-dominated atmospheres as well as for performing atmospheric evolution calculations. Aims: We aim to study the applicability range of the EL approximation. Methods: We revise the EL formalism and its assumptions. We also compare its results with those of hydrodynamic simulations, employing a grid covering planets with masses, radii, and equilibrium temperatures ranging between 1 $M_{\oplus}$ and 39 $M_{\oplus}$, 1 $R_{\oplus}$ and 10 $R_{\oplus}$, and 300 and 2000 K, respectively. Results: Within the grid boundaries, we find that the EL approximation gives a correct order of magnitude estimate for mass-loss rates for about 76% of the planets, but there can be departures from hydrodynamic simulations by up to three orders of magnitude in individual cases. Furthermore, we find that planets for which the mass-loss rates are correctly estimated by the EL approximation to within one order of magnitude have intermediate gravitational potentials as well as low-to-intermediate equilibrium temperatures and irradiation fluxes of extreme ultraviolet and X-ray radiation. However, for planets with low or high gravitational potentials, or high equilibrium temperatures and irradiation fluxes, the approximation fails in most cases. Conclusions: The EL approximation should not be used for planetary evolution calculations that require computing mass-loss rates for planets that cover a broad parameter space. In this case, it is very likely that the EL approximation would at times return mass-loss rates of up to several orders of magnitude above or below those predicted by hydrodynamic simulations. For planetary atmospheric evolution calculations, interpolation routines or approximations based on grids of hydrodynamic models should be used instead.
description: 12 pages, 7 figures, Published in A&A in June 2021; Revised on 9.11.2021 to correct typo in equation 2
Antecedents and Financial Performance Impacts of Philanthropy in Thai Listed Firms: A PLS-SEM analysis
Creators: name: Usarat Thirathon
name: Suneerat Wuttichindanon
Publisher: name: คณะพาณิชยศาสตร์และการบัญชี มหาวิทยาลัยธรรมศาสตร์
Year: 2019
Subjects: CSR in Thailand
Philanthropy
Corporate Financial Performance

description: วารสารวิชาชีพบัญชี JAP, 15, 46 (มิถุนายน 62), 65
Method of earth fault loop impedance measurement without nuisance tripping of RCDs in 3-phase low-voltage circuits
Creators: name: Czapp, Stanisław
Publisher: name: Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation
Year: 2019
Subjects: electrical safety
fault current
impedance measurement
power systems
fault protection

description: Metrology and Measurement Systems is an international journal, peer-reviewed, quarterly-published, launched in 1988; since 2001 it appears in English. The list of topics covered includes: theory and general principles of measurement; measurement of physical, chemical and biological quantities; medical measurements; sensors and transducers; measurement data acquisition; measurement signal transmission; processing and data analysis; measurement systems and embedded systems; design, manufacture and evaluation of instruments. Impact Factor for 2018: 1. 096 5-Year Impact Factor: 1.149 Contributions are invited on all aspects of the research, development and applications of the measurement science and technology. The list of topics covered includes: theory and general principles of measurement; measurement of physical, chemical and biological quantities; medical measurements; sensors and transducers; measurement data acquisition; measurement signal transmission; processing and data analysis; measurement systems and embedded systems; design, manufacture and evaluation of instruments.
description: Verification of electrical safety in low-voltage power systems includes the measurement of earth fault loop impedance. This measurement is performed to verify the effectiveness of protection against indirect contact. The widespread classic methods and meters use a relatively high value of the measuring current (520) A, so that they are a source of nuisance tripping of residual current devices (RCDs). The meters dedicated to circuits with RCDs usually use an extremely low value of current (lower than 15 mA), which in many cases it is not acceptable in terms of the measurement accuracy. This paper presents a method of earth fault loop impedance measurement in 3-phase circuits, without nuisance tripping of RCDs – the concept of measurement, the meter structure and the experimental validation. The nuisance tripping is avoided in spite of the use of measuring current value many times higher than that of the rated residual current of RCDs. The main advantage of the proposed method is the possibility of creating values of measuring current in a very wide range, what is very important with regard to accuracy of the measurement.
Overcoming Observation Bias for Cancer Progression Modeling
Creators: name: Schill, Rudolf
name: Klever, Maren
name: Lösch, Andreas
name: Hu, Y. Linda
name: Vocht, Stefan
name: Rupp, Kevin
name: Grasedyck, Lars
name: Spang, Rainer
name: Beerenwinkel, Niko
Publisher: name: ETH Zurich
Year: 2023
Subjects: Cancer progression model
Selection bias
Collider bias

description: Cancers evolve by accumulating genetic alterations, such as mutations and copy number changes. The chronological order of these events is important for understanding the disease, but not directly observable from cross-sectional genomic data. Cancer progression models (CPMs), such as Mutual Hazard Networks (MHNs), reconstruct the progression dynamics of tumors by learning a network of causal interactions between genetic events from their co-occurrence patterns. However, current CPMs fail to include effects of genetic events on the observation of the tumor itself and assume that observation occurs independently of all genetic events. Since a dataset contains by definition only tumors at their moment of observation, neglecting any causal effects on this event leads to the “conditioning on a collider” bias: Events that make the tumor more likely to be observed appear anti-correlated, which results in spurious suppressive effects or masks promoting effects among genetic events. Here, we extend MHNs by modeling effects from genetic progression events on the observation event, thereby correcting for the collider bias. We derive an efficient tensor formula for the likelihood function and learn two models on somatic mutation datasets from the MSK-IMPACT study. In colon adenocarcinoma, we find a strong effect on observation by mutations in TP53, and in lung adenocarcinoma by mutations in EGFR. Compared to classical MHNs, this explains away many spurious suppressive interactions and uncovers several promoting effects.
description: bioRxiv
The Journeys of Accounting Shared Services Centers of Large Multinational Companies in Thailand
Creators: name: Titawadee Sutthijakra
Publisher: name: คณะพาณิชยศาสตร์และการบัญชี มหาวิทยาลัยธรรมศาสตร์
Year: 2019
Subjects: Shared Services Center (SSC)
Accounting Shared Services
Mimetic Isomorphism

description: วารสารวิชาชีพบัญชี JAP, 15, 46 (มิถุนายน 62), 80
MEDIA TA'LIM METODLARI ORQALI TALABALARNI KREATIV FIKRLASHGA O'RGATISH MEXANIZMLARINING NAZARIY ASOSLARI
Creators: name: Raximova, Xurzoda
Publisher: name: Zenodo
Year: 2025

description: Ushbu maqolada media ta’lim metodlari orqali talabalarni kreativ fikrlashga o‘rgatish mexanizmlarining nazariy asoslari haqida qisqacha mazmini bayon etilgan.
Resonant and dissonant voices in the social landscape : the dynamics of a community economic development discourse
Creators: name: Ree, Scott Alexander
Publisher: name: University of British Columbia
Year: 2010

description: This thesis is about the enabling and disabling role played by signifying systems such as language and discourse in processes of socio-political change. A Community Economic Development discourse provides an example which illustrates this role. Central to the thesis is a supposition that as social beings we are situated in formative relations, webs of signification which are constructed through socio-historical processes. These relations enable communication, association, identity, and social order, but as they are the product of exclusory processes, they are highly political; they make our lives meaningful but also powerful. Positions of domination and subordination can be formed and sustained in the exercise of order. Systems of signification play an important role in shaping and reshaping formative relations, in structuring the social landscape, by producing and reproducing meaning and knowledge. Meaning and knowledge affect thought and action through selective legitimization. Sign systems, therefore, are never innocent, despite often appearing as though natural. These systems give meaning to and yet distort lived experience; they present arbitrary associations as truth. In this way statements that people make are never entirely separate from value systems, or from dynamics of power in society. These statements may, innocently or not, reproduce the prevailing significations and help sustain dominant and subordinant positions. Hence writers cannot disassociate themselves from the formative relations and strategies of control in which they are embedded, or from the power and influence of their work. This structuring process, however, is not complete. We are not totally at the mercy of dominant cultural patterns and imposed significations and meanings. To produce one must exclude. So there remain reserved and uncultivated spaces in the social landscape. There are resistant texts and counter-discourses, there is noise outside of order. This noise insites and disrupts resonating currents. Disruption may force a break in formative relations and a change in the landscape. Community economic development provides an example of the effects of signifying systems. In this thesis, five positional characterizations are presented from statements about CED. These characterizations show that there are dissonant voices that challenge the dominant significations. Yet we also see the resonating power of myth, of dominant discourse, that transforms noise into order.
title: Comment un projet pédagogique aide-t-il à renforcer la cohésion de groupe et la confiance en soi des élèves ?
title: Comment un projet pédagogique aide-t-il à renforcer la cohésion de groupe et la confiance en soi des élèves ?
titleType: AlternativeTitle
Creators: name: Burnier, Lauriane
Publisher: name: Unknown
Year: 0
Subjects: subject: projet pédagogique
subject: cohésion de groupe
subject: confiance en soi
subject: climat de classe
subject: collaboration
subject: théâtre

description: Comment un projet pédagogique aide-t-il à renforcer la cohésion de groupe et la confiance en soi des élèves ? Pour répondre à cette question, ce travail présente les résultats obtenus suite à un projet pédagogique mené dans une classe de 9VP sur le deuxième semestre de l’année scolaire 2020-2021. Le projet choisi consiste en l’enregistrement de pièces radiophoniques, afin d’introduire la dimension théâtrale avec ces élèves. Le cadre théorique aborde tout d’abord la notion de confiance en soi, élément important du développement personnel que l’on retrouve dans les objectifs du PER. Ensuite, les termes de climat de classe et de cohésion de groupe sont définis. Ces deux aspects contribuent au développement de l’élève, et également à la qualité de son environnement d’apprentissage. Enfin, le projet pédagogique est expliqué, afin de pouvoir mettre en avant les points qu’il devrait permettre de travailler. Pour observer une évolution suite à la mise en place de ce projet, un questionnaire a été distribué aux élèves qui y ont répondu à deux reprises, une première fois en début de projet et une seconde fois en fin de projet. Les résultats montrent, dans l’ensemble, une stabilité des différents facteurs observés. Une légère diminution de la confiance en soi et en les autres est toutefois à relever. Ces résultats mettent en évidence le fait que les objectifs du PER liés au développement personnel devraient régulièrement être travaillés à l’école. Ces objectifs nécessitent un apprentissage pour lequel les élèves ont besoin d’être accompagnés. Pour que le projet pédagogique puisse renforcer au mieux la cohésion de groupe et la confiance en soi, il semble important d’y introduire un véritable engagement personnel. Par exemple, une pièce de théâtre, sans la dimension radiophonique, permettrait de travailler la dimension corporelle et l’écoute entre les élèves. Néanmoins, ce projet a permis aux élèves de développer leur capacité à collaborer.
The Star-forming Region NGC 346 in the Small Magellanic Cloud with Hubble Space Telescope ACS Observations. II. Photometric Study of the Intermediate-Age Star Cluster BS 90
Creators: name: Rochau, Boyke
name: Gouliermis, Dimitrios A.
name: Brandner, Wolfgang
name: Dolphin, Andrew E.
name: Henning, Thomas
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of our investigation of the intermediate-age star cluster BS 90, located in the vicinity of the HII region N 66 in the SMC, observed with HST/ACS. The high-resolution data provide a unique opportunity for a very detailed photometric study performed on one of the rare intermediate-age rich SMC clusters. The complete set of observations is centered on the association NGC 346 and contains almost 100,000 stars down to V ~28 mag. In this study we focus on the northern part of the region, which covers almost the whole stellar content of BS 90. We construct its stellar surface density profile and derive structural parameters. Isochrone fits on the CMD of the cluster results in an age of about 4.5 Gyr. The luminosity function is constructed and the present-day mass function of BS 90 has been obtained using the mass-luminosity relation, derived from the isochrone models. We found a slope between -1.30 and -0.95, comparable or somewhat shallower than a typical Salpeter IMF. Examination of the radial dependence of the mass function shows a steeper slope at larger radial distances, indicating mass segregation in the cluster. The derived half-mass relaxation time of 0.95 Gyr suggests that the cluster is mass segregated due to its dynamical evolution. From the isochrone model fits we derive a metallicity for BS 90 of [Fe/H]=-0.72, which adds an important point to the age-metallicity relation of the SMC. We discuss our findings on this relation in comparison to other SMC clusters.
description: Accepted for Publication in ApJ, 12 pages emulateapj TeX style, 10 figures
Privacy Observation: Aggregation System for Reproduction of Privacy Studies
Creators: name: Kast, Patrice
Publisher: name: ETH Zurich
Year: 2023

description: The widespread practices of data collection and tracking on the internet drive the business models of numerous web services, which was demonstrated by numerous prior research. Despite the emergence of privacy regulations and technologies, their impact on data collection practices remains understudied. In a continuously evolving online landscape, unlike long-term studies, one-time web measurements have several limitations in their meaningfulness.

The majority of tracking studies require collecting specific data that existing internet archiving initiatives do omit. In contrast, the Privacy Observatory introduced in this thesis orchestrates long-term, regular crawls and measurements. We reimplement five influential privacy measurement studies, and evaluate their reproducibility, by using theoretical criteria from prior work, which we show are not guaranteeing practical aspects of reproducibility. Our approach relies on containerised Docker images and standardised input/output interfaces, which not only facilitates study replication but also reveals six fundamental principles crucial for ensuring the long-term replicability of such studies by future researchers.

By reimplementing these studies on the Privacy Observatory and executing them regularly, we enable continuous observation of trends in privacy regulation compliance within an immutable execution environment, offering insights into long-term developments in internet privacy practices.
Fine structure of the local pseudogap and Fano effect for superconducting electrons near a zigzag graphene edge
Creators: name: Tkachov, Grigory
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Motivated by recent scanning tunneling experiments on zigzag-terminated graphene this paper investigates an interplay of evanescent and extended quasiparticle states in the local density of states (LDOS) near a zigzag edge using the Green's function of the Dirac equation. A model system is considered where the local electronic structure near the edge influences transport of both normal and superconducting electrons via a Fano resonance. In particular, the temperature enhancement of the critical Josephson current and 0-pi transitions are predicted.
description: 5 pages, 5 figures, to be published in Phys. Rev. B