cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Meridional Circulation of Dust and Gas in the Circumstellar Disk: Delivery of Solids onto the Circumplanetary Region
Creators: name: Szulágyi, J.
name: Binkert, F.
name: Surville, C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We carried out 3D dust+gas radiative hydrodynamic simulations of forming planets. We investigated a parameter grid of Neptune-, Saturn-, Jupiter-, and 5 Jupiter-mass planets at 5.2, 30, 50 AU distance from their star. We found that the meridional circulation \citep{Szulagyi14,FC16} drives a strong vertical flow for the dust as well, hence the dust is not settled in the midplane, even for mm-sized grains. The meridional circulation will deliver dust and gas vertically onto the circumplanetary region, efficiently bridging over the gap. The Hill-sphere accretion rates for the dust are $\sim10^{-8}$ to $10^{-10}$ $\rm{M_{Jup}/yr}$, increasing with planet-mass. For the gas component, the gain is $10^{-6}$ to $10^{-8}$ $\rm{M_{Jup}/yr}$. The difference between the dust and gas accretion rates is smaller with decreasing planetary mass. In the vicinity of the planet, the mm-grains can get trapped easier than the gas, which means the circumplanetary disk might be enriched with solids in comparison to the circumstellar disk. We calculated the local dust-to-gas ratio (DTG) everywhere in the circumstellar disk and identified the altitude above the midplane where the DTG is 1, 0.1, 0.01, 0.001. The larger the planetary mass, the higher the mm-sized dust is delivered and a larger fraction of the dust disk is lifted by the planet. The stirring of mm-dust is negligible for Neptune-mass planets or below, but significant above Saturn-mass.
description: ApJ accepted
Influence of Supercurrents on Low-Temperature Thermopower in Mesoscopic N/S Structures
Creators: name: Zou, J.
name: Sosnin, I.
name: Virtanen, P.
name: Meschke, M.
name: Petrashov, V. T.
name: Heikkila, T. T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The thermopower of mesoscopic normal metal/superconductor structures has been measured at low temperatures. Effect of supercurrent present in normal part of the structure was studied in two cases: when it was created by applied external magnetic field and when it was applied directly using extra superconducting electrodes. Temperature and magnetic field dependencies of thermopower are compared to the numerical simulations based on the quasiclassical theory of the superconducting proximity effect.
description: 21 pages, 12 figures. To be published in the proceedings of the ULTI conference organized in Lammi, Finland (2006)
Nonlinear Evolution of Hydrodynamical Shear Flows in Two Dimensions
Creators: name: Lithwick, Yoram
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine how perturbed shear flows evolve in two-dimensional, incompressible, inviscid hydrodynamical fluids, with the ultimate goal of understanding the dynamics of accretion disks. To linear order, vorticity waves are swung around by the background shear, and their velocities are amplified transiently before decaying. It has been speculated that sufficiently amplified modes might couple nonlinearly, leading to turbulence. Here we show how nonlinear coupling occurs in two dimensions. This coupling is remarkably simple because it only lasts for a short time interval, when one of the coupled modes is in mid-swing. We focus on the interaction between a swinging and an axisymmetric mode. There is instability provided that k_{y,swing}/k_{x,axi} < omega/q, i.e., that the ratio of wavenumbers is less than the ratio of the axisymmetric mode's vorticity to the background vorticity. If this is the case, then when the swinging mode is in mid-swing it couples with the axisymmetric mode to produce a new leading swinging mode that has larger vorticity than itself; this new mode in turn produces an even larger leading mode, etc. Therefore all axisymmetric modes, regardless of how small in amplitude, are unstable to perturbations with sufficiently large azimuthal wavelength. We show that this shear instability occurs whenever the momentum transported by a perturbation has the sign required for it to diminish the background shear; only when this occurs can energy be extracted from the mean flow and hence added to the perturbation. For an accretion disk, this means that the instability transports angular momentum outwards while it operates.
description: published version
Bononia, the Roman Bologna: Archaeoastronomy and Chronology
Creators: name: Sparavigna, Amelia Carolina
Publisher: name: Zenodo
Year: 2019
Subjects: Archaeoastronomy
Roman chronology
Roman towns
Bononia
Bologna
Centuriation

description: In an article written by Giulio Magli on the orientation of the Roman towns, Bononia, the Roman Bologna, is given as a specific example to support Magli’s thesis on the existence of preferred solar alignments of the urban layout. Assuming that the Roman towns had been oriented to the sunrise on the day of their foundation, Magli suggested possible preferred alignments according to Roman festivals, in particular the festival of Terminalia. Of Bononia, we know the date of foundation in 189 BC, given by Livy. We will show that, according to Roman chronology and Republican calendar, it is impossible that Bononia had been oriented to the sunrise on the day given by Livy. The discrepancy is huge. Moreover, the direction of the decumanus cannot match the dates of Terminalia for 189 BC. However, if we consider that the layout that we see today is that of a recolonization under Octavian, we can have a certain agreement between the direction of the decumanus and the Terminalia (within three days). As we will stress in the discussion, the problem of the discrepancy between the historical dates of Roman chronology and the Julian dates, those that we can find according to an astronomical analysis, is general and must be properly considered in any archaeoastronomical analysis of Roman towns.
Light-Shift Imbalance Induced Blockade of Collective Excitations Beyond the Lowest Order
Creators: name: Shahriar, M. S.
name: Pradhan, P.
name: Pati, G. S.
name: Gopal, V.
name: Salit, K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Current proposals focusing on neutral atoms for quantum computing are mostly based on using single atoms as quantum bits (qubits), while using cavity induced coupling or dipole-dipole interaction for two-qubit operations. An alternative approach is to use atomic ensembles as qubits. However, when an atomic ensemble is excited, by a laser beam matched to a two-level transition (or a Raman transition) for example, it leads to a cascade of many states as more and more photons are absorbed^1. In order to make use of an ensemble as a qubit, it is necessary to disrupt this cascade, and restrict the excitation to the absorption (and emission) of a single photon only. Here, we show how this can be achieved by using a new type of blockade mechanism, based on the light-shift imbalance (LSI) in a Raman transition. We describe first a simple example illustrating the concept of light shift imbalanced induced blockade (LSIIB) using a multi-level structure in a single atom, and show verifications of the analytic prediction using numerical simulations. We then extend this model to show how a blockade can be realized by using LSI in the excitation of an ensemble. Specifically, we show how the LSIIB process enables one to treat the ensemble as a two level atom that undergoes fully deterministic Rabi oscillations between two collective quantum states, while suppressing excitations of higher order collective states.
description: 6 pages, 5 figures
Multipole moments as a tool to infer from gravitational waves the geometry around an axisymmetric body
Creators: name: Sotiriou, Thomas P.
name: Apostolatos, Theocharis A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A binary system, composed of a compact object orbiting around a massive central body, will emit gravitational waves which will depend on the central body's spacetime geometry. We expect that the gravitational wave observables will somehow ``encode'' the information about the spacetime structure. On the other hand, it has been known for some time that the geometry around an axisymmetric body can be described by its (Geroch-Hansen) multipole moments. Therefore one can speculate that using the multipole moments can prove to be a helpful tool for extracting this information. We will try to demonstrate this in this talk, following the procedure described by [F. D. Ryan, Phys. Rev. D {\bf 52} 5707 (1995)] and [T. P. Sotiriou and T. A. Apostolatos, Phys. Rev. D {\bf 71} 044005 (2005)].
description: Talk given by T. P. S. at Albert Einstein's Century International Conference, Paris, France, 18-22 Jul 2005
Influence of synthetic mustelid semiochemicals on population dynamics of the deer mouse
Creators: name: Zimmerling, Linda M.
Publisher: name: University of British Columbia
Year: 2008

description: In this study I investigated population changes in the deermouse (Peromyscus maniculatus) in the southwestern part of the Morice Forest District of the Prince Rupert Forest Region of British Columbia. I tested the hypothesis that synthetic weasel odours would adversely affect deer mouse population parameters. In July, 1991, three areas were treated with weasel odour and in September, 1991 three additional areas were treated. The same areas were treated in July and September of 1992. Densities of deer mice were not found to be significantly different between treated and control areas. However, on average, numbers of deer mice were lower on treated areas following the July treatments of 1991 and 1992. Survival rates appeared to be lower and more erratic on treated than control areas in 1991; however, there were no statistically significant differences. Reproduction appeared to be unaffected by the odours. I concluded that deer mice did not display a behavioural response, as manifested by population parameters, to weasel odours. I speculated that decreases in densities were owing to predation by weasels which were attracted to the odours on treated sites. I also concluded that the use of weasel odours as a biological control method for voles (Microtus spp.) would likely have little impact on deer mice (a non-target species). Community stability would be maintained with this relatively species-specific biological control method.
Sub-millimetre compactness as a critical dimension to understand the Main Sequence of star-forming galaxies
Creators: name: Puglisi, Annagrazia
name: Daddi, Emanuele
name: Valentino, Francesco
name: Magdis, Georgios
name: Liu, Daizhong
name: Kokorev, Vasilii
name: Circosta, Chiara
name: Elbaz, David
name: Bournaud, Frederic
name: Gomez-Guijarro, Carlos
name: Jin, Shuowen
name: Madden, Suzanne
name: Sargent, Mark T.
name: Swinbank, Mark
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the interstellar medium (ISM) properties as a function of the molecular gas size for 77 infrared-selected galaxies at $z \sim 1.3$. Molecular gas sizes are measured on ALMA images that combine CO(2-1), CO(5-4) and underlying continuum observations, and include CO(4-3), CO(7-6)+[CI]($^3 P_2-^3P_1$), [CI]($^3 P_1-^3P_0$) observations for a subset of the sample. The $\gtrsim 46 \%$ of our galaxies have a compact molecular gas reservoir, and lie below the optical disks mass-size relation. Compact galaxies on and above the main sequence have higher CO excitation and star formation efficiency than galaxies with extended molecular gas reservoirs, as traced by CO(5-4)/CO(2-1) and CO(2-1)/$L_{\rm IR, SF}$ ratios. Average CO+[CI] spectral line energy distributions indicate higher excitation in compacts relative to extended sources. Using CO(2-1) and dust masses as molecular gas mass tracers, and conversion factors tailored to their ISM conditions, we measure lower gas fractions in compact main-sequence galaxies compared to extended sources. We suggest that the sub-millimetre compactness, defined as the ratio between the molecular gas and the stellar size, is an unavoidable information to be used with the main sequence offset to describe the ISM properties of galaxies, at least above $M_{\star} \geqslant 10^{10.6}$ M$_{\odot}$, where our observations fully probe the main sequence scatter. Our results are consistent with mergers driving the gas in the nuclear regions, enhancing the CO excitation and star formation efficiency. Compact main-sequence galaxies are consistent with being an early post-starburst population following a merger-driven starburst episode, stressing the important role of mergers in the evolution of massive galaxies.
description: Accepted on MNRAS on October 11th 2021. Added Figure 10, 11, 12 following referee's comments. Abstract slightly modified to fit to arXiv's requirements
title: The potency analysis of mesenchymal stromal cells and their extracellular vesicles with a focus on apoptotic bodies
Creators: name: Wang, Jiemin
Publisher: name: University of Galway
Year: 2024
Subjects: subject: immunotherapy
subject: immunostimulatory
subject: immunomodulatory
subject: extracellular vesicles
subject: apoptotic bodies
subject: microvesicles
subject: Medicine

description: Immunotherapy, including immunostimulation and immunosuppression, has seen significant development in the last ten years. Immunostimulation has been verified as effective in anti-cancer treatment, while immunosuppression is used in the treatment of autoimmune disease and inflammation. Currently, with the update of newly invented simplified isolation methods and the findings of potent triggered immune responses, extracellular vesicle-based immunotherapy is very eye-catching. However, the research on three main types of extracellular vesicles, exosomes, microvesicles and apoptotic bodies, needs to be more balanced. These three subtypes share a certain level of similarity, and at the same time, they have their own properties caused by the different methods of biogenesis. Herein, we summarized the status of immunotherapy based on each kind of vesicle and discuss the possible involved mechanisms, respectively. In conclusion, we highlighted that the immunomodulatory effect of the apoptotic body is clear and strong. Apoptotic bodies have an excellent potential in immunosuppressive and anti-inflammatory therapies.
The deconfining phase of SU(2) Yang-Mills thermodynamics
Creators: name: Hofmann, Ralf
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present an overview on nonperturbative thermodynamics in the deconfining phase of an SU(2) Yang-Mills theory. In a unique effective theory the maximal resolution of trivial-topology fluctuations is constrained by coarse-grained, interacting calorons and anticalorons. Loop expansions of thermodynamical quantities are discussed. Postulating that SU(2)$_{\tiny{CMB}}\stackrel{\tiny{today}}=U(1)_Y$, a modification of thermalized, low-momentum photon propagation is predicted for temperatures a few times that of the cosmic microwave background. We discuss phenomenological implications: magnetic-field induced dichroism and birefringence at a temperature of 4.2 K (PVLAS), stability of cold and dilute clouds of atomic hydrogen in our galaxy, and absence of low-$l$ correlations in the TT CMB power spectrum.
description: 8 pages, 1 figure, talk delivered at Continuous Advances in QCD 2006, Minneapolis, contains more information than the talk, v2: consequences of change in evolution equation implemented, hardy a change in physics
Τεκμήριο ακρίβειας κτηματολογικών εγγραφών και τεκμήριο κυριότητας στο Εθνικό Κτηματολόγιο
Creators: name: Γκίκα, Ζωή Λεωνίδα
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Αμάχητο τεκμήριο ακρίβειας των πρώτων κτηματολογικών εγγραφών
Μαχητό τεκμήριο ακρίβειας των μεταγενέστερων κτηματολογικών
εγγραφών
Τεκμήριο κυριότητας του Ελληνικού Δημοσίου
Non-rebuttable presumption of accuracy of the first cadastral registrations
Rebuttable presumption of accuracy of the posterior cadastral registrations
Presumption of property of the Greek Public

description: Σκοπός της διατριβής ήταν η μελέτη του αμάχητου και μαχητού τεκμηρίου ακρίβειας των κτηματολογικών εγγραφών, καθώς και του τεκμηρίου κυριότητας στο Εθνικό Κτηματολόγιο. Για την καλύτερη κατανόηση των θεμάτων, η διατριβή αυτή έχει χωριστεί σε τρία κεφάλαια. Το πρώτο κεφάλαιο ασχολείται συγκεκριμένα με το αμάχητο τεκμήριο ακρίβειας των πρώτων κτηματολογικών εγγραφών. Προσδιορίζεται εννοιολογικά η οριστικοποίηση των πρώτων κτηματολογικών εγγραφών και διερευνάται η νομική φύση του αμάχητου τεκμηρίου ακρίβειάς τους, καθώς και οι έννομες συνέπειες του αμάχητου τεκμηρίου. Το δεύτερο κεφάλαιο αναλύει λεπτομερώς το μαχητό τεκμήριο ακρίβειας των μεταγενέστερων κτηματολογικών εγγραφών, καθώς, επίσης, την ανατροπή του και τις έννομες συνέπειές του. Τέλος, στο τρίτο κεφάλαιο εξετάζεται ενδελεχώς το τεκμήριο κυριότητας του Ελληνικού Δημοσίου στα ακίνητα «αγνώστου ιδιοκτήτη», καθώς και στα δάση και τις δασικές γενικά εκτάσεις
description: The aim of the present thesis was the study of non-rebuttable and rebuttable presumption of accuracy of cadastral registrations and the presumption of property at the National Cadastral Registry. In order to provide a clear understanding of the issues, this thesis has been divided into three chapters. The first chapter deals with non-rebuttable presumption of accuracy of the first cadastral registrations in particular. There is a discussion of the conceptual determination of the finalization of first cadastral registrations, and a consideration of the legal nature of the non-rebuttable presumption of their accuracy and the legitimate implications of non-rebuttable presumption. Chapter two is a detailed analysis of rebuttable presumption of accuracy of the posterior cadastral registrations, as to its refutation and legitimate implications thereof. Finally, in the third chapter there is a close look at the presumption of property of the Greek Public towards real property of “unknown owner”, as in forests and forest land in general
Rough translation of file 022_A (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio files VP-010214-02 and VP-010214-03: Rough translation (minute-by-minute) of file 022_A (tape 022, side A) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from the beginning of the file to 15:00 (VP-010214-02) and from 15:00 to the end of the file (VP-010214-03); no transcription in this session, translation only. Due to re-numbering, tape 022_A has been assigned to the CLA item number LA256.022, audio file LA256.022A.
Model Independent Prediction of the Spectral Index of Primordial Quantum Fluctuations
Creators: name: Gomez, Cesar
name: Jimenez, Raul
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: One of the most important achievements of inflationary cosmology is to predict a departure from scale invariance of the power spectrum for scalar curvature cosmological fluctuations. This tilt is understood as a consequence of a quasi de Sitter classical equation of state describing the inflationary dark energy dominated era. Here, following previous work, we find a departure of scale invariance for the quantum Fisher information associated to de Sitter vacuum for scalar quantum spectator modes. This gives rise to a purely quantum cosmological tilt with a well defined dependence on energy scale. This quantum tilt is imprinted, in a scale dependent energy uncertainty for the spectator modes. The effective quasi de Sitter description of this model independent energy uncertainty uniquely sets the effective quasi de Sitter parameters at all energy scales. In particular, in the slow-roll regime characterized by an almost constant $ε$, the quantum Fisher -- model independent -- prediction for the spectral index is $(1-n_s) = 0.0328$ ($n_s=0.9672$). Moreover, the energy scale dependence of the quantum cosmological tilt implies the existence of a cosmological phase transition at energies higher than the CMB scale where the tilt goes from red into blue. This strongly suggest the existence of a pre-inflationary phase where the effective scalaron contributes to the spectral index as normal relativistic matter and where the corresponding growth of the power spectrum can result in dark matter in the form of small mass primordial black holes. The source and features of the quantum cosmological tilt leading to these predictions are determined by the entanglement features of the de Sitter vacuum states.
description: Matches accepted version to JCAP; results unchanged
Least-Informative Priors for $0νββ$ Decay Searches
Creators: name: Deppisch, Frank F.
name: Van Goffrier, Graham
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Bayesian parameter inference techniques require a choice of prior distribution which can strongly impact the statistical conclusions drawn. We discuss the construction of least-informative priors for neutrinoless double beta decay searches. Such priors attempt to be objective by maximizing the information gain from an experimental setup. In a parametrization using the lightest neutrino mass $m_l$ and an effective Majorana phase parameter $Φ$, we construct such a prior using two different approaches and compare them with the standard flat and logarithmic priors in $m_l$.
description: 19 pages, 6 figures, matches published version
Scoping report of data and models for impact attribution
Creators: name: Paprotny, Dominik
Publisher: name: Zenodo
Year: 2024
Subjects: impact attribution
vulnerability
exposure
datasets
methods
multivariate
downscaling
models
COMPASS

description: This report collects information on available data, models, methods, and tools on exposure, vulnerability, and impacts that have prospective use in the project, either for use cases (Tasks 4.1 and 4.3) or the overall impact attribution framework (Task 3.4). It also contributes preliminary data and methods for other tasks in WP3, including exposure datasets at multiple scales (D3.1) and vulnerability models for multiple hazards (D3.3). It further considers the requirements of a prospective operational attribution service utilizing a methodology developed in the project. In general, we list only datasets and models which are publicly accessible without any restrictions, unless there are no such resources available for a particular aspect of exposure or vulnerability.
Radiative Rayleigh-Taylor Instability and the structure of clouds in planetary atmospheres
Creators: name: Tremblin, P.
name: Bloch, H.
name: González, M.
name: Audit, E.
name: Fromang, S.
name: Padioleau, T.
name: Kestener, P.
name: Kokh, S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Clouds are expected to form in a wide range of conditions in the atmosphere of exoplanets given the large range of possible condensible species. However this diversity might lead to very different small-scale dynamics depending on radiative transfer in various thermal conditions: we aim at providing some insights into these dynamical regimes. We perform an analytical linear stability analysis of a compositional discontinuity with a heating source term that depends on composition. We also perform idealized two-dimensional (2D) simulations of an opacity discontinuity in a stratified medium with the code ARK. We use a two-stream grey model for radiative transfer and explore the brown-dwarf and earth-like regimes. We reveal the existence of a Radiative Rayleigh-Taylor Instability (RRTI hereafter, a particular case of diabatic Rayleigh-Taylor instability) when an opacity discontinuity is present in a stratified medium. This instability is similar in nature to diabatic convection and relies only on buoyancy with radiative transfer heating and cooling. When the temperature is decreasing with height in the atmosphere, a lower-opacity medium on top of a higher-opacity medium is dynamically unstable while a higher-opacity medium on top of a lower-opacity medium is stable. This stability/instability behavior is reversed if the temperature is increasing with height. The existence of the RRTI could have important implications for the stability of the cloud cover of a wide range of planetary atmospheres. In our solar system, it could help explain the formation of mammatus cloud in Earth atmospheres and the existence of Venus cloud deck. Likewise, it suggests that stable and large scale cloud covers could be ubiquitous in strongly irradiated exoplanets but might be more patchy in low-irradiated or isolated objects like brown dwarfs and directly imaged exoplanets.
description: Accepted in A&A
Testing the universal stellar IMF on the metallicity distribution in the bulges of the Milky Way and M31
Creators: name: Ballero, Silvia K.
name: Kroupa, Pavel
name: Matteucci, Francesca
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We test whether the universal initial mass function (UIMF) or the integrated galaxial IMF (IGIMF) can be employed to explain the metallicity distribution (MD) of giants in the Galactic bulge. We make use of a single-zone chemical evolution model developed for the Milky Way bulge in the context of an inside-out model for the formation of the Galaxy. We checked whether it is possible to constrain the yields above $80 M_{\sun}$ by forcing the UIMF and required that the resulting MD matches the observed ones. We also extended the analysis to the bulge of M31 to investigate a possible variation of the IMF among galactic bulges. Several parameters that have an impact on stellar evolution (star-formation efficiency, gas infall timescale) are varied. We show that it is not possible to satisfactorily reproduce the observed metallicity distribution in the two galactic bulges unless assuming a flatter IMF ($x \leq 1.1$) than the universal one. We conlude that it is necessary to assume a variation in the IMF among the various environments.
description: 9 pages, 4 figures, accepted for publication in A&A
Influence of the neighborhood on cyclic models of biodiversity
Creators: name: Bazeia, D.
name: Bongestab, M.
name: de Oliveira, B. F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: This work deals with the influence of the neighborhood in simple rock-paper-scissors models of biodiversity. We consider the case of three distinct species which evolve under the standard rules of mobility, reproduction and competition. The rule of competition follows the guidance of the rock-paper-scissors game, with the prey being annihilated, leaving an empty site in accordance with the May-Leonard proposal for the predator and prey competition. We use the von Neumann neighborhood, but we consider mobility under the presence of the first, second and third neighbors in three distinct environments, one with equal probability and the others with probability following the power law and exponential profiles. The results are different, but they all show that increasing the neighbourhood increases the characteristic length of the system in an important way. We have studied other possibilities, in particular the case where one modifies the manner a specific species competes, unveiling the interesting result in which the strongest individuals may constitute the less abundant population.
description: 22 pages, 12 figures, to appear in Physica A
Η εικόνα της χώρας προέλευσης και η επιρροή της στην αξία της επωνυμίας
Creators: name: Τσομπανίδης, Ιωάννης Στέφανου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Χώρα προέλευσης
Αξία της επωνυμίας
Προϊόντα πολυτελείας
Country-of-origin
Brand equity
Luxury products

description: Σκοπός της παρούσας εργασίας είναι η εξέταση της επιρροής που μπορεί να έχει η εικόνα της χώρας προέλευσης στην αξία της επωνυμίας των προϊόντων πολυτελείας. Στο θεωρητικό μοντέλο, όπου βασίζεται η έρευνα, διατυπώνεται ότι η εικόνα της χώρας προέλευσης επηρεάζει τις διαστάσεις της αξίας της επωνυμίας, δηλαδή την αναγνωρισιμότητα της επωνυμίας, την προσήλωση στη μάρκα, την εκλαμβανόμενη ποιότητα και τις συσχετίσεις της επωνυμίας. Έπειτα αυτές οι διαστάσεις σχηματίζουν την αξία της επωνυμίας. Το ερευνητικό εργαλείο που χρησιμοποιήθηκε για τη συλλογή των δεδομένων είναι το ερωτηματολόγιο. Η ανάλυση των αποτελεσμάτων οδήγησε στη διαμόρφωση δύο βασικών συμπερασμάτων. Αφενός ότι η εικόνα της χώρας προέλευσης των προϊόντων πολυτελείας έχει σημαντική επίδραση στην αξία της επωνυμίας και τις διαστάσεις της. Αφετέρου ότι η αναγνωρισιμότητα της επωνυμίας, η προσήλωση στη μάρκα, η εκλαμβανόμενη ποιότητα και οι συσχετίσεις της επωνυμίας σχηματίζουν καθοριστικά την αξία της επωνυμίας για τα προϊόντα πολυτελείας. Η πρακτική εφαρμογή της έρευνας αφορά κυρίως τις εταιρείες και τους πωλητές των προϊόντων πολυτελείας, οι οποίοι θα πρέπει να προωθούν τη θετική εικόνα της χώρας προέλευσης με σκοπό να βελτιώσουν τη συνολική εικόνα μίας μάρκας πολυτελείας.
description: The purpose of this study is to analyse the influence of the country-of-origin image on luxury products’ brand equity. The theoretical framework, on which the study is based, posits that country-of-origin image influences the brand equity dimensions, namely brand awareness, brand loyalty, perceived quality and brand associations. Onwards, these dimensions form brand equity. A questionnaire is used as a research instrument to collect the study’s data. The study came to two conclusions. First, country-of-origin image of luxury products has a significant influence on brand equity and brand equity dimensions. Second, brand awareness, brand loyalty, perceived quality and brand associations play a determinant role in the formation of luxury products’ brand equity. The practical implications of the study mostly concern the companies and the retailers of luxury goods, who should promote the positive country-of-origin image in order to enhance the overall image of the product.
Rough translation of file 022_B (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-010214-04: Rough translation (minute-by-minute) of file 022_B (tape 022, side B) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from the beginning of the file to 33:02; no transcription in this session, translation only. Due to re-numbering, tape 022_B has been assigned to the CLA item number LA256.022, audio file LA256.022B.
Stationary solutions and Neumann boundary conditions in the Sivashinsky equation
Creators: name: Denet, Bruno
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Physics (physics.class-ph)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: New stationary solutions of the (Michelson) Sivashinsky equation of premixed flames are obtained numerically in this paper. Some of these solutions, of the bicoalescent type recently described by Guidi and Marchetti, are stable with Neumann boundary conditions. With these boundary conditions, the time evolution of the Sivashinsky equation in the presence of a moderate white noise is controlled by jumps between stationary solutions.
Multi-dimensional Treatment of Photon Emission from Accretion Disks around Black Holes
Creators: name: Kohri, Kazunori
name: Ohsuga, Ken
name: Narayan, Ramesh
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider photon emission from a supercritical accretion disk in which photons in the inner regions are trapped and advected in towards the center. Such disks are believed to be present in failed supernovae and gamma-ray bursts, and possibly also in ultra-luminous X-ray sources. We show that the luminosity from a supercritical accretion disk is proportional to the logarithm of the mass accretion rate when the vertical profile of the matter density is exponential. We obtain analytical results also for other density profiles, but the dependence of the luminosity on the accretion rate is no longer logarithmic.
description: 8 pages, 3 figures, accepted version, to appear in MNRAS
Influence of large-scale food supplementation on diversity of rodent communities
Creators: name: Kohler, Chris Mark
Publisher: name: University of British Columbia
Year: 2009

description: Rodents were monitored bi-weekly to determine seasonal responses of rodent diversity to large scale supplemental feeding. Sunflower seeds were added by helicopter to thinned, fertilized, pole-sized lodgepole pine stands in the Montane Spruce (MS[sub dm]) - Engelmann Spruce-Subalpine Fir (ESSF[sub dc2]) biogeoclimatic zone (transition area) of southern interior British Columbia. My objectives were: 1) to determine the rate of seed consumption; 2) to determine the response of rodent communities to supplemental feeding; and 3) to evaluate methods for expressing species diversity. Forty-eight 1-m² seed plots were used to estimate seed consumption rate. Consumption rates did not differ among stands, or between inside (where trap bait was present) and outside small mammal trap grids. Seed consumption rate increased as summer progressed, and was faster during the second year than the first year of seeding. The Simpson index indicated that diversity decreased in seeded areas, as a result of declining evenness caused by increased deer mouse (Perornyscus inanicularus) population density. Species richness was maintained on seeded areas, and hence log series alpha expressed higher diversity on one of the two seeded areas, when compared to its respective control. I reviewed literature to assess the merits of using the Shannon-Wiener and Simpson indices, Shannon-Wiener and Simpson evenness, and log series alpha. For my purposes, the Simpson index was the most useful for expressing changing dominance, and log series alpha was most useful for reflecting richness. Both indices have low sensitivity to sample size and are highly discriminatory. The Shannon Wiener index and Simpson and Shannon-Wiener evenness were used for comparing results among other studies.
A Finite Energy-Momentum Tensor for the $ϕ^3$ theory in $6$ dimensions
Creators: name: Dharanipragada, Pavan
name: Sathiapalan, Bala
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Following Brown[1], we construct composite operators for the scalar $ϕ^3$ theory in six dimensions using renormalisation group methods with dimensional regularisation. We express bare scalar operators in terms of renormalised composite operators of low dimension, then do this with traceless tensor operators. We then express the bare energy momentum tensor in terms of the renormalised composite operators, with some terms having divergent coefficients. We subtract these away and obtain a manifestly finite energy tensor. The subtracted terms are transverse, so this does not affect the conservation of the energy momentum tensor. The trace of this finite improved energy momentum tensor vanishes at the fixed point indicating conformal invariance. Interestingly it is not RG-invariant except at the fixed point, but can be made RG invariant everywhere by further addition of transverse terms, whose coefficients vanish at the fixed point.
description: v2: added arxiv numbers for references, added page numbers, added email id, and corrected one typo in eqn in page 15. v1: 32 pages, 5 figures
Thin shell wormholes in higher dimensiaonal Einstein-Maxwell theory
Creators: name: Rahaman, F.
name: Kalam, M.
name: Chakraborty, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We construct thin shell Lorentzian wormholes in higher dimensional Einstein-Maxwell theory applying the ' Cut and Paste ' technique proposed by Visser. The linearized stability is analyzed under radial perturbations around some assumed higher dimensional spherically symmetric static solution of the Einstein field equations in presence of Electromagnetic field. We determine the total amount of exotic matter, which is concentrated at the wormhole throat.
description: 10 pages, accepted in Gen.Rel.Grav
O ρόλος, η προοπτική και οι δυνατότητες των Φο.Σ.Ε. κατά την επικείμενη αγορά ηλεκτρικής ενέργειας στην Ελλάδα
Creators: name: Διαλυνάς, Γεώργιος Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Φορέας Σωρευτικής Εκπροσώπησης
Ελληνική αγορά ηλεκτρικής ενέργειας
Ευρωπαϊκό μοντέλο-στόχος
RES Aggregator
Greek electricity market
European electricity target model

description: Σκοπός της διατριβής ήταν η μελέτη ενός νέου τύπου εταιρίας παροχής ενεργειακών υπηρεσιών που ονομάζεται Φορέας Σωρευτικής Εκπροσώπισης. Παρουσιάζεται η Ευρωπαϊκή και η Ελληνική πολιτική για την ενέργεια και το περιβάλλον και η συμβολή των ανανεώσιμων πηγών στον μεταχηματισμό της δομής του ενεργειακού τομέα. Στη συνέχεια γίνεται αναφορά στο Ελληνικό χρηματιστήριο ενέργειας και στο χρονοδιάγραμμα έναρξης των τεσσάρων βασικών ενεργειακών αγορών. Ακολουθεί αναλυτική αξιολόγηση του ρόλου, της πρoοπτικής και των δυνατοτήτων των Φορέων Σωρευτικής Εκπροσώπησης όσο αφορά στη βελτίωση της αποτελεσματικότητας του ενεργειακού συστήματος. Διερευνάται η ικανότητα διαχείρισης των κινδύνων και της πολυπλοκότητας των διανεμημένων πηγών ενέργειας. Εξετάζεται η συμβολή τους στην μείωση του κενού πληροφόρησης, στην ενίσχυση του ανταγωνισμού, της καινοτομίας, στην αντιμετώπιση της ενεργειακής ένδειας και του φαινομένου της κλιματικής αλλαγής. Επίσης, γίνεται αναφορά στις πρώτες εταιρίες που απέκτησαν άδεια Φορέα Σωρευτικής Εκπροσώπισης στην Ελλάδα και στο ειδος των ενεργειακών υπηρεσιών που προσφέρουν.
description: The aim of the present diploma thesis was to study a new type of energy service company called Aggregator. The European and Greek policies on energy and environment and the contribution of renewable energy sources to the transformation of the energy sector structure are presented. Subsequently there is a reference to the Hellenic Energy Exchange and to the time schedule about the beginning of the four main energy markets. Then we present α detailed assessment of the role, prospects and capabilities of Aggregators in terms of improving the efficiency of the energy system. The ability to manage the risks and complexity of distributed energy sources is explored. We also examine the contribution to the reduction of the information gap, to the strengthening of competition, to innovation, to the treatment of energy poverty and the phenomenon of climate change. Also, reference is made to companies that already obtained Aggregator licenses in Greece and to the type of energy services they provide.
EL PATRIMONIO DOCUMENTAL DE LA UNIVERSIDAD DE LA HABANA: PROPUESTAS PARA SU SALVAGUARDA Y DIFUSIÓN.
Creators: name: Puerta-Díaz, Mirelys
name: Chinea-Martínez, Gretel
Publisher: name: Zenodo
Year: 2016
Subjects: Universidad de La Habana
patrimonio documental
gestión documental
patrimonio cultural

description: Se abordan aspectos conceptuales en torno al patrimonio documental y su gestión en el marco de la Universidad de La Habana. Se exponen las principales debilidades y fortalezas para su salvaguarda y difusión. Se presentan los principales proyectos que acomete la Casa de Altos Estudios en pos de preservar la memoria universitaria. Se realizan propuestas para el trazado de pautas para su preservación a largo plazo en la Universidad de La Habana.
Non-Gaussian mechanical motion via single and multi-phonon subtraction from a thermal state
Creators: name: Enzian, Georg
name: Freisem, Lars
name: Price, John J.
name: Svela, Andreas Ø.
name: Clarke, Jack
name: Shajilal, Biveen
name: Janousek, Jiri
name: Buchler, Ben C.
name: Lam, Ping Koy
name: Vanner, Michael R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Quantum optical measurement techniques offer a rich avenue for quantum control of mechanical oscillators via cavity optomechanics. In particular, a powerful yet little explored combination utilizes optical measurements to perform heralded non-Gaussian mechanical state preparation followed by tomography to determine the mechanical phase-space distribution. Here, we experimentally perform heralded single- and multi-phonon subtraction via photon counting to a laser-cooled mechanical thermal state with a Brillouin optomechanical system at room temperature, and use optical heterodyne detection to measure the $s$-parameterized Wigner distribution of the non-Gaussian mechanical states generated. The techniques developed here advance the state-of-the-art for optics-based tomography of mechanical states and will be useful for a broad range of applied and fundamental studies that utilize mechanical quantum-state engineering and tomography.
description: Main and supplementary in single file. 19 pages, 6 figures. (www.qmeas.net)
Competing over truth: a critical analysis of EU initiatives to counter disinformation (2015-2019)
Creators: name: Giussani, Alessio Marco
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Παραπληροφόρηση
Έλεγχος εγκυρότητας πληροφοριών
Επιμόρφωση στα μέσα επικοινωνίας
Disinformation
Fact-checking
Media literacy

description: This research provides a critical analysis of counter-disinformation strategies set in motion by the EU since 2015, when European institutions decided that disinformation needed to be addressed as a threat to democracy. Disinformation is a multifaceted phenomenon, in rapid evolution, and so are the strategies adopted by the EU to fight it; moreover, counter-disinformation initiatives come from various EU institutions and bodies, making it impossible to discuss them in a logical or chronological order. This research focuses instead on three clusters of strategies that recur in EU sources: fact-checking (run by independent outlets as well as by EU bodies), self-regulation of the platforms and media literacy. It appears that the EU’s approach to disinformation - characterized by an emphasis on Russia and by the reluctance to intervene with regulatory measures that may restrict free speech - does not significantly reform the existing information ecosystem, a highly disinformation-conductive one. Without substantial reform at the system level, also media literacy is likely to fall short of its objectives.
description: Αυτή η έρευνα παρέχει μια κριτική ανάλυση στρατηγικών ενάντια στην παραπληροφόρηση που εφάρμοσε η ΕΕ από το 2015, όταν οι Ευρωπαϊκοί θεσμοί αποφάσισαν ότι η παραπληροφόρηση πρέπει να αντιμετωπίζεται ως απειλή της Δημοκρατίας. Η παραπληροφόρηση είναι ένα πολύπλευρο φαινόμενο, με γρήγορη εξέλιξη, όπως και οι στρατηγικές που υιοθέτησε η ΕΕ για την καταπολέμηση της. Επιπλέον, πρωτοβουλίες ενάντια στην παραπληροφόρηση προέρχονται από πολλούς διαφορετικούς θεσμούς και φορείς της ΕΕ, πράγμα που καθιστά αδύνατη τη συζήτηση τους σε μια λογική ή χρονολογική σειρά. Γι’ αυτό το λόγο, η έρευνα αυτή επικεντρώνεται σε τρεις κατηγορίες στρατηγικών που χρησιμοποιούνται συστηματικά από πηγές της ΕΕ: έλεγχος εγκυρότητας πληροφοριών (fact-checking) (εφαρμόζεται από ανεξάρτητα μέσα κι από φορείς της ΕΕ), αυτορρύθμιση των πλατφόρμων και επιμόρφωση στα μέσα επικοινωνίας (media literacy). Φαίνεται πως η προσέγγιση της ΕΕ ενάντια στην παραπληροφόρηση, η οποία χαρακτηρίζεται από μια έμφαση στη Ρωσία και από μια διστακτικότητα παρέμβασης με ρυθμιστικά μέτρα που μπορεί να περιορίσουν την ελευθερία του λόγου, δεν τροποποιεί σημαντικά το υπάρχον οικοσύστημα της πληροφορίας, το οποίο ευνοεί την παραπληροφόρηση. Χωρίς ουσιαστικές μεταρρυθμίσεις σε συστημικό επίπεδο, η επιμόρφωση στα μέσα (media literacy) είναι επίσης πιθανό να μην πετύχει τους στόχους της.
Μειωμένο Ωράριο Εργασίας: Οφέλη για εργαζομένους και οργανισμούς
Creators: name: Παρασκευόπουλος, Γεώργιος Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Μειωμένο ωράριο εργασίας
Reduced working time

description: Με την έννοια εργασία, ορίζουμε τον απαραίτητο χρόνο που απαιτείται για να κερδίσει κάποιος το εισόδημα του. Αυτή η έννοια, δεν είναι συνώνυμη με την δραστηριότητα, που δυστυχώς πολλές φορές παραποιείται. Η διαπραγμάτευση για μείωση του χρόνου εργασίας έχει σταματήσει δραματικά από το 1980. Ταυτόχρονα η μετάβαση από μια οικονομία παραγωγής σε μια οικονομία υπηρεσιών έχει δυσκολέψει τις μετρήσεις και τις διαπραγματεύσεις περί μισθούς και συνθήκες εργασίας. Οι πολιτικές παρεμβάσεις πρέπει να κατευθυνθούν λιγότερο στην τόνωση της οικονομικής ανάπτυξης και περισσότερο στην προώθηση της εργασιακής ασφάλειας – απασχόλησης, τις συνθήκες εργασίας, την οργανωσιακή αποτελεσματικότητα και την ισορροπία μεταξύ εργασιακής και μη εργασιακής ζωής. Στο παρελθόν οι μειώσεις των ωρών εργασίας συνδέονταν άμεσα με το Ακαθάριστο Εγχώριο Προϊόν. Το ΑΕΠ όμως αποτελεί ένα μέσο μέτρησης της ποσότητας της εμπορεύσιμης παραγωγής, η οποία δεν καταγράφει αξία από μη εμπορικούς τομείς της οικονομίας. Συνεπώς η μείωση του χρόνου εργασίας δεν θα πρέπει να συνδέεται άκαμπτα με αυτή την στενή μέτρηση. Το Κράτος, ως κύριος εργοδότης θα πρέπει να ασκήσει άμεση επιρροή στην μείωση του χρόνου εργασίας ως ένα επιθυμητό αποτέλεσμα μιας σύγχρονης και προοδευτικής κοινωνίας. Μια ενδιαφέρουσα θεωρία η οποία επικρατεί στις μέρες μας είναι πως οι άνθρωποι θα πρέπει να εργάζονται λιγότερο για να ζούνε περισσότερο. Δίνοντας έτσι την πολυτέλεια του χρόνου να κάνει κάποιος αυτό που τον ευχαριστεί ώστε να φορτίζεται αυτόματα με πνευματική ευημερία
description: Negotiations to reduce working time have stopped dramatically since 1980. At the same time, the transition from a production economy to a service economy has made it difficult to measure and negotiate wages and working conditions. Political interventions should be less directed at stimulating economic growth and more at promoting job security - employment, working conditions, organizational effectiveness and the balance between work and non-work life. In the past, reductions in working hours were directly linked to the Gross Domestic Product. However, GDP is a means of measuring the amount of marketable output, which does not record value from non-commercial sectors of the economy. Therefore, the reduction of working time should not be rigidly linked to this close measurement. The State, as the main employer, should have a direct influence on the reduction of working time as a desired outcome of a modern and progressive society. An interesting theory that is prevalent, nowadays, is that people should work less to live longer. Thus, we give the luxury of time to anyone to do what pleases him and automatically be charged with spiritual prosperity