cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
"L'Italia intatta" di Mario Tozzi
Creators: name: De Vecchis, Gino
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2019

description: L’apparente paradosso con il quale s’intitola il libro, L’Italia intatta, potrebbe apparire a una primissima vista una provocazione lanciata per ragionare sui tanti guasti che nell’ultimo mezzo secolo il nostro Paese ha subìto. Tuttavia, contenuti e obiettivi che Mario Tozzi ha inteso offrire ai lettori, con ricchezza di argomentazioni, sono esplicitati nella successiva lettura del lungo sottotitolo (Viaggio nei luoghi italiani non alterati dagli uomini e fermi nel tempo. Un mosaico di straordinaria bellezza), che è impostato su tre termini chiave: luoghi, tempo e bellezza. Nel testo non mancano certo né esortazioni e inviti volti a una maggiore consapevolezza ecologica né forti denunce per azioni gravi perpetrate nei confronti dell’ambiente, ma lo sguardo dell’Autore è soprattutto intento a illustrare luoghi di straordinario valore naturalistico, considerati in qualche modo intatti.
description: Semestrale di studi e ricerche di geografia, N. 1 (2019): Scenari Fluviali: rappresentazioni, pratiche e visioni
"Transizioni postmetropolitane. Declinazioni locali delle dinamiche posturbane in Sicilia" di Francesco Lo Piccolo, Marco Picone, Vincenzo Todaro
Creators: name: Fessina, Alessandro
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2019

description: Il volume presenta i risultati della ricerca occorsa all’interno del Progetto di Rilevante Interesse Nazionale (PRIN) 2010-2011 “Territori post-metropolitani come forme urbane emergenti” ponendosi come conclusione della stessa. La finalità della ricerca è investigare la dimensione contemporanea dell’abitare con riferimento a due contesti territoriali della Regione Sicilia: quello metropolitano di Palermo e la Sicilia Sud-orientale, aree molto diverse per caratteristiche e localizzazione spaziale.
description: Semestrale di studi e ricerche di geografia, N. 1 (2019): Scenari Fluviali: rappresentazioni, pratiche e visioni
Protein Dynamical Transition in Terahertz Dielectric Response
Creators: name: Markelz, Andrea G.
name: Knab, Joseph R.
name: Chen, Jing Yin
name: He, Yunfen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The 200 K protein dynamical transition is observed for the first time in the teraherz dielectric response. The complex dielectric permittivity $ε$ = $ε$' + i$ε$" is determined in the 0.2 - 2.0 THz and 80-294 K ranges. $ε$" has a linear temperature dependence up to 200 K then sharply increases. The low temperature linear dependence in $ε$" indicates anharmonicity for temperatures 80 K < T < 180 K, challenging the assumed harmonicity below 200K. The temperature dependence is consistent with beta relaxation response and shows the protein motions involved in the dynamical transition extend to subpicosecond time scales.
Near-Infrared Photometry of the Type IIn SN 2005ip: The Case for Dust Condensation
Creators: name: Fox, Ori
name: Skrutskie, Michael F.
name: Chevalier, Roger A.
name: Kanneganti, Srikrishna
name: Park, Chan
name: Wilson, John
name: Nelson, Matthew
name: Amirhadji, Jason
name: Crump, Danielle
name: Hoeft, Alexi
name: Provence, Sydney
name: Sargeant, Benjamin
name: Sop, Joel
name: Tea, Matthew
name: Thomas, Steven
name: Woolard, Kyle
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Near-infrared photometric observations of the Type IIn SN 2005ip in NGC 2906 reveal large fluxes (>1.3 mJy) in the K_s-band over more than 900 days. While warm dust can explain the late-time K_s-band emission of SN 2005ip, the nature of the dust heating source is ambiguous. Shock heating of pre-existing dust by post-shocked gas is unlikely because the forward shock is moving too slowly to have traversed the expected dust-free cavity by the time observations first reveal the K_s emission. While an infrared light echo model correctly predicts a near-infrared luminosity plateau, heating dust to the observed temperatures of ~1400-1600 K at a relatively large distance from the supernova (> 10^{18} cm) requires an extraordinarily high early supernova luminosity (~1 X 10^{11} L_solar). The evidence instead favors condensing dust in the cool, dense shell between the forward and reverse shocks. Both the initial dust temperature and the evolutionary trend towards lower temperatures are consistent with this scenario. We infer that radiation from the circumstellar interaction heats the dust. While this paper includes no spectroscopic confirmation, the photometry is comparable to other SNe that do show spectroscopic evidence for dust formation. Observations of dust formation in SNe are sparse, so these results provide a rare opportunity to consider SNe Type IIn as dust sources.
description: 11 pages, 6 figures, 3 tables, Accepted for Publication to ApJ: January 20, 2009
Superconductivity without attraction in a quasi-one-dimensional metal
Creators: name: Rozhkov, A. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: An array of one-dimensional conductors coupled by transverse hopping and interaction is studied with the help of a variational wave function. This wave function is devised as to account for one-dimensional correlation effects. We show that under broad conditions our system possesses the superconducting ground state even if no attraction is present. The superconducting mechanism is of many-body nature and deviates substantially from BCS. The phase diagram of the model is mapped. It consists of two ordered phases competing against each other: density wave, spin or charge, and unconventional superconductivity. These phases are separated by the first order transition. The symmetry of the superconducting order parameter is a non-universal property. It depends on particulars of the Hamiltonian. Within the framework of our model possible choices are the triplet $f$-wave and the singlet $d_{xy}$-wave. Organic quasi-one-dimensional superconductors have similar phase diagram.
description: 12 pages, 2 Encapsulated PostScript figures, revtex4; the model's Hamiltonian is revised as compared to previous version, this revision affects prediction of the order parameter symmetry
Feedback Control and the Arrow of Time
Creators: name: Georgiou, Tryphon T.
name: Smith, Malcolm C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Dynamical Systems (math.DS)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 93D99, 93A99

description: The purpose of this paper is to highlight the central role that the time asymmetry of stability plays in feedback control. We show that this provides a new perspective on the use of doubly-infinite or semi-infinite time axes for signal spaces in control theory. We then focus on the implication of this time asymmetry in modeling uncertainty, regulation and robust control. We point out that modeling uncertainty and the ease of control depend critically on the direction of time. We also discuss the relationship of this control-based time-arrow with the well known arrows of time in physics.
description: 21 pages, 1 figure
Fingerprints for spin-selection rules in the interaction dynamics of O2 at Al(111)
Creators: name: Carbogno, Christian
name: Behler, Joerg
name: Gross, Axel
name: Reuter, Karsten
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We performed mixed quantum-classical molecular dynamics simulations based on first-principles potential-energy surfaces to demonstrate that the scattering of a beam of singlet O2 molecules at Al(111) will enable an unambiguous assessment of the role of spin-selection rules for the adsorption dynamics. At thermal energies we predict a sticking probability that is substantially less than unity, with the repelled molecules exhibiting characteristic kinetic, vibrational and rotational signatures arising from the non-adiabatic spin transition.
description: 4 pages including 3 figures; related publications can be found at http://www.fhi-berlin.mpg.de/th/th.html
Posterior convergence rates of Dirichlet mixtures at smooth densities
Creators: name: Ghosal, Subhashis
name: van der Vaart, Aad
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62G07, 62G20 (Primary)

description: We study the rates of convergence of the posterior distribution for Bayesian density estimation with Dirichlet mixtures of normal distributions as the prior. The true density is assumed to be twice continuously differentiable. The bandwidth is given a sequence of priors which is obtained by scaling a single prior by an appropriate order. In order to handle this problem, we derive a new general rate theorem by considering a countable covering of the parameter space whose prior probabilities satisfy a summability condition together with certain individual bounds on the Hellinger metric entropy. We apply this new general theorem on posterior convergence rates by computing bounds for Hellinger (bracketing) entropy numbers for the involved class of densities, the error in the approximation of a smooth density by normal mixtures and the concentration rate of the prior. The best obtainable rate of convergence of the posterior turns out to be equivalent to the well-known frequentist rate for integrated mean squared error $n^{-2/5}$ up to a logarithmic factor.
description: Published at http://dx.doi.org/10.1214/009053606000001271 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
title: Neither Representation nor Values? Or, 'Europe's Moment' - Part II
Creators: name: Cannizzaro, Enzo
Publisher: name: European Papers (www.europeanpapers.eu)
Year: 2021
Subjects: subject: community of values
subject: EU fundamental values
subject: Next Generation EU
subject: conditionality mechanism
subject: EU budget
subject: illiberal democracy

description: European Papers - A Journal on Law and Integration, 2020 5(3), 1101-1104
description: Part I of this Editorial dealt with the interrelation between representation and taxation reflected in the measures adopted or envisaged by the EU institutions to face the COVID-19 pandemic. There is, however, another relationship which is at stake in these turbulent days. Representation also entails the existence of a set of distinctive values shared by a community, whose protection and promotion should be shared by its representatives. This conceptual scheme, simplistic as it may be, can help us understand the story of the conditionality mechanism designed to exclude EU Member States (MS) which violate the Union’s fundamental values from the financial assistance provided for by the Next Generation EU (NGEU) project. As is well know, this mechanism is established by Regulation 2020/2092 of the European Parliament and of the Council, of 16 December 2020, on a general regime of conditionality for the protection of the Union budget. It is equally notorious that, prior to its approval, the European Council adopted, with the usual method of consensus, a declaration related to its implementation, incorporated in its Conclusions of the meeting of 10 and 11 December 2020. The idea promoted by the political declaration of the European Council – that violations of the rule of law come within the scope of the Regulation only if this violation produces a detrimental impact of the principle of the sound financial management – is therefore untenable, in legal logic no less than legal ethics. There would be no need to make a Regulation to determine that conduct of a MS affecting the sound financial management of EU funds are in breach of EU law; Art. 310, para. 5, and the existing rules implementing it would have been more than sufficient. Nor should the declaration be regarded as an intelligent expedient necessary to overcome the objections of Poland and Hungary. These MS perceived Regulation 2020/2092 as a serious obstacle to the pursuit of their own model of illiberal democracy within the Union and did not shy away from threatening to veto the new decision on own resources and on the Multiannual financial framework i.e. the financial sources of NGEU.Regulation 2020/2092 symbolically expresses a very basic paradigm: participation in the integration project entails the sharing of its fundamental values. Its unconditioned adoption, therefore, would have transposed the discourse on Union’s values from axiology to law; it would have definitively established the Union as a community of values; it would have constituted a revolutionary start for a new phase of the process of integration. To have given all this up in the name of a political compromise has indelibly stained this European moment.
Nonextensive Reaction Rate
Creators: name: Bagci, G. B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The Kramers' survival probability has been generalized by using nonextensive formalism. This nonextensive survival probability is studied in detail and associated Kramers' rate has been calculated in the high and low viscosity limit. It has been showed that the proportionality of nonextensive Kramers' rate to the nonextensive friction term in the high viscosity limit changes to inverse proportionality in the low viscosity limit. It has also been observed that friction constant of nonextensive processes is of rescaled form of the ordinary frictional term. Since the relation between the ordinary rate and nonextensive rate is found out to be linear, the Arrhenius nature of the Kramers' rate is preserved. By using experimental results related to CO rebinding to myoglobin after photodissociation, we conclude that nonextensivity plays an important role in protein reactions.
description: 6 pages, 1 Figure
Sets of Exact Approximation Order by Complex rational numbers
Creators: name: He, Yubin
name: Xiong, Ying
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: For a nonincreasing function $ψ$, let $\textrm{Exact}(ψ)$ be the set of complex numbers that are approximable by complex rational numbers to order $ψ$ but to no better order. In this paper, we obtain the Hausdorff dimension and packing dimension of $\textrm{Exact}(ψ)$ when $ψ(x)=o(x^{-2})$. We also prove that the lower bound of the Hausdorff dimension is greater than $2-τ/(1-2τ)$ when $τ=\limsup_{x\to\infty}ψ(x)x^2$ small enough.
Global distribution of oxygenated polycyclic aromatic hydrocarbons in mineral topsoils
Creators: name: Wilcke, Wolfgang
name: Bigalke, Moritz
name: Wei, Chong
name: Han, Yongming
name: Musa Bandowe, Benjamin A.
Publisher: name: FID GEO
Year: 2021

description: Hazardous oxygenated polycyclic aromatic hydrocarbons (OPAHs) originate from combustion (primary sources) or postemission conversion of polycyclic aromatic hydrocarbons (PAHs) (secondary sources). We evaluated the global distribution of up to 15 OPAHs in 195 mineral topsoils from 33 study sites (covering 52° N–47° S, 71° W–118 °E) to identify indications of primary or secondary sources of OPAHs. The sums of the (frequently measured 7 and 15) OPAH concentrations correlated with those of the Σ16EPA‐PAHs. The relationship of the Σ16EPA‐PAH concentrations with the Σ7OPAH/Σ16EPA‐PAH concentration ratios (a measure of the variable OPAH sources) could be described by a power function with a negative exponent <1, leveling off at a Σ16EPA‐PAH concentration of approximately 400 ng g–1. We suggest that below this value, secondary sources contributed more to the OPAH burden in soil than above this value, where primary sources dominated the OPAH mixture. This was supported by a negative correlation of the Σ16EPA‐PAH concentrations with the contribution of the more readily biologically produced highly polar OPAHs (log octanol‐water partition coefficient <3) to the Σ7OPAH concentrations. We identified mean annual precipitation (Spearman ρ = .33, p 400 ng g–1, there was a nearly constant Σ7OPAH/Σ16EPA‐PAH ratio (0.08 ± 0.005 [SE], n = 80) determined by their combustion sources.
description: Core Ideas: Some oxygenated PAHs are more hazardous to the environment and human health than PAHs. OPAHs can originate from combustion or postemission conversion from PAHs. At low PAH concentrations, secondary OPAHs dominate the OPAHs mixture. The concentration ratio of combustion‐derived OPAHs to PAHs appears to be almost constant. The OPAH/PAH concentration ratios in topsoils at low PAH concentrations correlate with rainfall and clay content.
description: Deutscher Akademischer Austauschdienst http://dx.doi.org/10.13039/501100001655
description: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung http://dx.doi.org/10.13039/501100001711
description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
description: National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809
"La geografia dell’incertezza. Crisi di un modello e della sua rappresentazione in età moderna" di Alessandro Ricci
Creators: name: Marconi, Matteo
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2019

description: Gli studi si suddividono in due categorie principali, quelli che aprono nuove e ampie prospettive e quelli che invece indagano una piccola porzione di realtà. I primi sono il sismografo dell’originalità e della freschezza di una disciplina, i secondi nutrono dimostrazioni più articolate.
description: Semestrale di studi e ricerche di geografia, N. 1 (2019): Scenari Fluviali: rappresentazioni, pratiche e visioni
Current quark mass dependence of nucleon magnetic moments and radii
Creators: name: Cloet, I. C.
name: Eichmann, G.
name: Flambaum, V. V.
name: Roberts, C. D.
name: Bhagwat, M. S.
name: Holl, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: A calculation of the current-quark-mass-dependence of nucleon static electromagnetic properties is necessary in order to use observational data as a means to place constraints on the variation of Nature's fundamental parameters. A Poincare' covariant Faddeev equation, which describes baryons as composites of confined-quarks and -nonpointlike-diquarks, is used to calculate this dependence The results indicate that, like observables dependent on the nucleons' magnetic moments, quantities sensitive to their magnetic and charge radii, such as the energy levels and transition frequencies in Hydrogen and Deuterium, might also provide a tool with which to place limits on the allowed variation in Nature's constants.
description: 23 pages, 2 figures, 4 tables, 4 appendices
Quantitative Determination of Enhanced and Suppressed Transmission through Subwavelength Slit Arrays in Silver Films
Creators: name: Lezec, H.
name: Pacifici, D.
name: Atwater, H.
name: Weiner, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Measurement of the transmitted intensity from a coherent monomode light source through a series of subwavelength slit arrays in Ag films, with varying array pitch and number of slits, demonstrate enhancement (suppression) by as much as a factor of 6 (9) when normalized to that of an isolated slit. Pronounced minima in the transmitted intensity were observed at array pitches corresponding to lambda_SPP, 2lambda_SPP, and 3lambda_SPP where lambda_SPP is the wavelength of the surface plasmon polariton (SPP). Increasing the number of slits to more than four does not increase appreciably the per-slit transmission intensity. These results are consistent with a model for interference between SPPs and the incident wave that fits well the measured transmitted intensity profile.
description: Figure 4 updated
"14° Rapporto Sanità. Misunderstandings" di Federico Spandonaro, Daniela D’Angela, Cristina Giordani, Barbara Polistena (a cura di)
Creators: name: Palagiano, Cosimo
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2019

description: Questo corposo 14° Rapporto sulla Sanità presenta e commenta con numerose illustrazioni e dati la situazione della Sanità in Italia, anche in relazione agli altri Paesi soprattutto europei. Un’ importante base di discussione sono la situazione demografica e la spesa sanitaria. Come per la demografia, anche per la Sanità è possibile distinguere due Italie, una settentrionale e una meridionale.
description: Semestrale di studi e ricerche di geografia, N. 1 (2019): Scenari Fluviali: rappresentazioni, pratiche e visioni
HD 203608, a quiet asteroseismic target in the old galactic disk
Creators: name: Mosser, B.
name: Deheuvels, S.
name: Michel, E.
name: Thevenin, F.
name: Dupret, M. A.
name: Samadi, R.
name: Barban, C.
name: Goupil, M. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A short observing run with the spectrometer Harps at the ESO 3.6-m telescope was conducted in order to continue exploring the asteroseismic properties of F type stars. In fact, Doppler observations of F type on the main sequence are demanding and remain currently limited to a single case (HD 49933). Comparison with photometric results obtained with the CoRoT mission on similar stars will be possible with an enhanced set of observations. We selected the 4th magnitude F8V star HD 203608, in order to investigate the oscillating properties of a low-metallicity star of the old galactic disk. A 5-night asteroseismic observation program has been conducted in August 2006 with Harps. Spectra were reduced with the on-line data reduction software provided by the instrument. A new statistical approach has been developed for extracting the significant peaks in the Fourier domain. The oscillation spectrum shows a significant excess power in the frequency range [1.5, 3.0 mHz]. It exhibits a large spacing about 120.4 $μ$Hz at 2.5 mHz. Variations of the large spacing with frequency are clearly identified, which require an adapted asymptotic development. The modes identification is based on the unambiguous signature of 15 modes with $\ell = 0$ and 1. This observation shows the potential diagnostic of asteroseismic constraints. Including them in the stellar modeling enhances significantly the precision on the physical parameters of \cible, resulting in a much more precise position in the HR diagram. The age of the star is now determined in the range $7.25\pm0.07$ Gyr.
description: 9 pages, submitted to A&A
"Geography and the ICT: New technologies & geographical research" di Valentina Albanese, Valentina Greco, Matteo Proto (a cura di)
Creators: name: Pavia, Davide
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2019

description: Senza rallentamenti, l’industria dell’ICT continua lo sviluppo di strumenti dalle crescenti capacità pervasive: basti pensare alla rivoluzione degli smartphone nelle comunicazioni, da cui provengono gli “iperconnessi” della neonata “look down generation”. Dai primi anni Sessanta, la Geografia si è avvalsa largamente dell’informatizzazione, agevolando applicazioni quali la cartografia e l’analisi spaziale; di pari passo con la loro evoluzione, è maturato l’interesse per le “GIT” (Geographic Information Technologies) da parte della ricerca scientifica, come dimostra il testo a cura di Valentina Albanese, Valentina Greco e Matteo Proto “Geography and the ICT: New Technologies & Geographical Research”.
description: Semestrale di studi e ricerche di geografia, N. 1 (2019): Scenari Fluviali: rappresentazioni, pratiche e visioni
Collective modes in imbalanced nodal line semimetal
Creators: name: Islam, SK Firoz
name: Zyuzin, Alexander A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this work, we investigate collective modes in a nodal line semimetal with two nodal-lines that have opposite spin polarization in the presence of spin population imbalance. We find the components of polarization operator taking into account the electron-electron exchange interaction and obtain the dispersion relations of collective modes for the bulk and surface states. There exist four modes in the bulk, among which one is gapless and other three are gapped. The gapless surface mode is sensitive to the boundary conditions.
description: Physical Review B (To Appear)
Quantifying experimental edge plasma evolution via multidimensional adaptive Gaussian process regression
Creators: name: Mathews, Abhilash
name: Hughes, Jerry
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The edge density and temperature of tokamak plasmas are strongly correlated with energy and particle confinement and their quantification is fundamental to understanding edge dynamics. These quantities exhibit behaviours ranging from sharp plasma gradients and fast transient phenomena (e.g. transitions between low and high confinement regimes) to nominal stationary phases. Analysis of experimental edge measurements therefore require robust fitting techniques to capture potentially stiff spatiotemporal evolution. Additionally, fusion plasma diagnostics inevitably involve measurement errors and data analysis requires a statistical framework to accurately quantify uncertainties. This paper outlines a generalized multidimensional adaptive Gaussian process routine capable of automatically handling noisy data and spatiotemporal correlations. We focus on the edge-pedestal region in order to underline advancements in quantifying time-dependent plasma profiles including transport barrier formation on the Alcator C-Mod tokamak.
description: 7 pages, 7 figures
"Everyday Geographies and Hidden Memories. Remembering Denis Cosgrove" di Francesco Vallerani (a cura di)
Creators: name: Visentin, Francesco
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2019

description: L’anno scorso, ad aprile 2018, a Venezia, al piano nobile di Palazzo Loredan, sede dell’Istituto veneto di Scienze, Lettere ed Arti, si è svolto un seminario titolato “Paesaggi, memorie, luoghi: ricordando Denis Cosgrove, geografo culturale”. La conferenza è stata organizzata da Francesco Vallerani (docente di Geografia all’Università Ca’ Foscari di Venezia), amico di lunga data del geografo originario di Liverpool, in occasione del decennale dalla sua prematura scomparsa. Il convegno si proponeva da un lato di riflettere sulla ancora attuale eredità intellettuale del lavoro di Denis Cosgrove e, dall’altro, si è prefigurato come uno spazio mentale attraverso il quale recuperare e condividere la dimensione affettiva e l’immenso patrimonio di memorie soggettive e quotidiane che ha lasciato in tutti coloro che hanno lavorato o condiviso del tempo con lui.
description: Semestrale di studi e ricerche di geografia, N. 1 (2019): Scenari Fluviali: rappresentazioni, pratiche e visioni
How do CHOICES and the SDS facilitate or hinder career planning
Creators: name: Provost, Charles Henri
Publisher: name: University of British Columbia
Year: 2010

description: CHOICES, the career planning computer program, was evaluated by interviewing 35 grade 11 and 12 students. Using the critical incident technique, reports were elicited of what facilitated or hindered their career planning. These collected incidents were categorized by similarity to provide counsellors and others with a map of exactly what the program does to help or hinder career planning. This map potentially enables counsellors to capitalize on benefits and to minimize possible detriments. Secondly, this map was qualitatively compared to a similar evaluation of the Self-Directed Search. Overall, it was found that the two interventions have differing advantages and disadvantages. CHOICES stresses reality constraints, specificity and extrinsic work features. The SDS underlines self-awareness and an understanding of the matching process. It seems that CHOICES is more appropriate for planning and specific decisions regarding options while the SDS tends to focus on general exploration and decisions regarding fields. The writer wishes to express his appreciation to the following persons: To Dr. Larry Cochran, research supervisor, whose patience, availability and countless hours over six years made this study possible. To Dr. Marv Westwood, whose continual support especially for the clinical comprehensive, was greatly appreciated. To Dr. Bill Borgen, whose encouragement at the appropriate time enabled me to perservere. To Dr. Norm Amundson, whose inspired synthesis made the oral presentation smoother. To Dr. Ron MacGregor, whose suggestions were appreciated. To the students, to the staff of Matthew McNair Senior Secondary and to the counsellor Mike Casselman, whose co-operation and support made this study possible. To Mrs. Irma Eichler, for her devoted time and effort in typing this dissertation. And finally, to my parents Rene and Lucille, to my sisters Louise and Anita, and to my brother Jean, for their continual support and encouragement.
Negative thermal expansion in single-component systems with isotropic interactions
Creators: name: Rechtsman, Mikael C.
name: Stillinger, Frank H.
name: Torquato, Salvatore
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We have devised an isotropic interaction potential that gives rise to negative thermal expansion (NTE) behavior in equilibrium many-particle systems in both two and three dimensions over a wide temperature and pressure range (including zero pressure). An optimization procedure is used in order to find a potential that yields a strong NTE effect. A key feature of the potential that gives rise to this behavior is the softened interior of its basin of attraction. Although such anomalous behavior is well known in material systems with directional interactions (e.g., zirconium tungstate), to our knowledge this is the first time that NTE behavior has been established to occur in single-component many-particle systems for isotropic interactions. Using constant-pressure Monte Carlo simulations, we show that as the temperature is increased, the system exhibits negative, zero and then positive thermal expansion before melting (for both two- and three-dimensional systems). The behavior is explicitly compared to that of a Lennard-Jones system, which exhibits typical expansion upon heating for all temperatures and pressures.
description: 21 pages, 13 figures
Study and characterization by magnetophonon resonance of the energy structuring in GaAs/AlAs quantum-wire superlattices
Creators: name: Ferrus, T.
name: Goutiers, B.
name: Ressier, L.
name: Peyrade, J. P.
name: Galibert, J.
name: Porto, J. A.
name: Sanchez-dehesa, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We present the characterization of the band structure of GaAs/AlAs quantum-wire 1D superlattices performed by magnetophonon resonance with pulsed magnetic fields up to 35 T. The samples, generated by the "atomic saw method" from original quantum-well 2D superlattices, underwent substantial modifications of their energy bands built up on the X-states of the bulk. We have calculated the band structure by a finite element method and we have studied the various miniband structures built up of the masses m_t and m_l of GaAs and AlAs at the point X. From an experimental point of view, the main result is that in the 2D case we observe only resonances when the magnetic field B is applied along the growth axis whereas in the 1D case we obtain resonances in all magnetic field configurations. The analysis of the maxima (or minima for B // E) in the resistivity rho_xy as a function of B allows us to account, qualitatively and semi-quantitatively, for the band structure theoretically expected.
Indirect magnetic interaction mediated by spin dimer in Cu$_2$Fe$_2$Ge$_4$O$_{13}$
Creators: name: Masuda, T.
name: Kakurai, K.
name: Matsuda, M.
name: Kaneko, K.
name: Metoki, N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Cu$_2$Fe$_2$Ge$_4$O$_{13}$ is a bicomponent compound that consists of Cu dimers and Fe chains with separate energy scale. By inelastic neutron scattering technique with high-energy resolution we observed the indirect Fe - Fe exchange coupling by way of the Cu dimers. The obtained parameters of the effective indirect interaction and related superexchange interactions are consistent with those estimated semi-statically. The consistency reveals that the Cu dimers play the role of nonmagnetic media in the indirect magnetic interaction.
description: to be published in PRB rapid communication
Corrugations in the Disk of the Edge-On Spiral Galaxy IC2233
Creators: name: Matthews, L. D.
name: Uson, Juan M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We recently reported the discovery of a regular corrugation pattern in the HI disk of the isolated, edge-on spiral galaxy IC2233. Here we present measurements of the vertical structure of this galaxy at several additional wavelengths, ranging from the far ultraviolet to the far infrared. We find that undular patterns with amplitude ~5''(~250 pc) are visible in a variety of Population I tracers in IC2233, including the young-to-intermediate age stars, the HII regions, and the dust. However, the vertical excursions become less pronounced in the older stellar populations traced by the mid-infrared light. This suggests that the process leading to the vertical displacements may be linked with the regulation of star formation in the galaxy. We have also identified a relationship between the locations of the density corrugations and small-amplitude (~5 km/s) velocity undulations in the HI rotation curve. We are able to exclude several possible mechanisms for the origin of the observed corrugations, including tidal interaction from a companion, Parker instabilities, or a galactic bore. Global gravitational instabilities appear to be the most likely explanation, although local perturbations may also be important.
description: accepted to ApJ; Table 2 is available in its entirely at http://www.cfa.harvard.edu/~lmatthew/tab2.tex
Statistical mechanics and thermodynamic limit of self-gravitating fermions in D dimensions
Creators: name: Chavanis, Pierre-Henri
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We discuss the statistical mechanics of a system of self-gravitating fermions in a space of dimension $D$. We plot the caloric curves of the self-gravitating Fermi gas giving the temperature as a function of energy and investigate the nature of phase transitions as a function of the dimension of space. We consider stable states (global entropy maxima) as well as metastable states (local entropy maxima). We show that for $D\ge 4$, there exists a critical temperature (for sufficiently large systems) and a critical energy below which the system cannot be found in statistical equilibrium. Therefore, for $D\ge 4$, quantum mechanics cannot stabilize matter against gravitational collapse. This is similar to a result found by Ehrenfest (1917) at the atomic level for Coulombian forces. This makes the dimension D=3 of our universe very particular with possible implications regarding the anthropic principle. Our study enters in a long tradition of scientific and philosophical papers who studied how the dimension of space affects the laws of physics.
Particle-like solutions to classical noncommutative gauge theory
Creators: name: Stern, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct perturbative static solutions to the classical field equations of noncommutative U(1) gauge theory for the three cases: a) space-time noncommutativity, b) space-space noncommutativity and c) both a) and b). The solutions tend to the Coulumb solution at spatial infinity and are valid for intermediate values of the radial coordinate $r$. They yield a self-charge in a sphere of radius $r$ centered about the origin which increases with decreasing $r$ for case a), and decreases with decreasing $r$ for case b). For case a) this may mean that the exact solution screens an infinite charge at the origin, while for case b) it is plausible that the charge density is well behaved at the origin, as happens in Born-Infeld electrodynamics. For both cases a) and b) the self-energy in the intermediate region grows faster as $r$ tends to the origin than that of the Coulumb solution. It then appears that the divergence of the classical self-energy is more severe in the noncommutative theory than it is in the corresponding commutative theory. We compute the lowest order effects of these solutions on the hydrogen atom spectrum and use them to put experimental bounds on the space-time and space-space noncommutative scales. We find that cases a) and b) have different experimental signatures.
description: 21 pages
Spin-Foam Models and the Physical Scalar Product
Creators: name: Alesci, Emanuele
name: Noui, Karim
name: Sardelli, Francesco
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper aims at clarifying the link between Loop Quantum Gravity and Spin-Foam models in four dimensions. Starting from the canonical framework, we construct an operator P acting on the space of cylindrical functions Cyl($Γ$), where $Γ$ is the 4-simplex graph, such that its ma- trix elements are, up to some normalization factors, the vertex amplitude of Spin-Foam models. The Spin-Foam models we are considering are the topological model, the Barrett-Crane model and the Engle-Pereira-Rovelli model. The operator P is usually called the "projector" into physical states and its matrix elements gives the physical scalar product. Therefore, we relate the physical scalar product of Loop Quantum Gravity to vertex amplitudes of some Spin-Foam models. We discuss the possibility to extend the action of P to any cylindrical functions on the space manifold.
description: 24 pages
Zero temperature solutions of the Edwards-Anderson model in random Husimi Lattices
Creators: name: Lage-Castellanos, A.
name: Mulet, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We solve the Edwards-Anderson model (EA) in different Husimi lattices. We show that, at T=0, the structure of the solution space depends on the parity of the loop sizes. Husimi lattices with odd loop sizes have always a trivial paramagnetic solution stable under 1RSB perturbations while, in Husimi lattices with even loop sizes, this solution is absent. The range of stability under 1RSB perturbations of this and other RS solutions is computed analytically (when possible) or numerically. We compute the free-energy, the complexity and the ground state energy of different Husimi lattices at the level of the 1RSB approximation. We also show, when the fraction of ferromagnetic couplings increases, the existence, first, of a discontinuous transition from a paramagnetic to a spin glass phase and latter of a continuous transition from a spin glass to a ferromagnetic phase.
description: 20 pages, 10 figures (v3: Corrected analysis of transitions. Appendix proof fixed)
Periodic Bursts of Coherent Radio Emission from an Ultracool Dwarf
Creators: name: Hallinan, G.
name: Bourke, S.
name: Lane, C.
name: Antonova, A.
name: Zavala, R. T.
name: Brisken, W. F.
name: Boyle, R. P.
name: Vrba, F. J.
name: Doyle, J. G.
name: Golden, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the detection of periodic (p = 1.96 hours) bursts of extremely bright, 100% circularly polarized, coherent radio emission from the M9 dwarf TVLM 513-46546. Simultaneous photometric monitoring observations have established this periodicity to be the rotation period of the dwarf. These bursts, which were not present in previous observations of this target, confirm that ultracool dwarfs can generate persistent levels of broadband, coherent radio emission, associated with the presence of kG magnetic fields in a large-scale, stable configuration. Compact sources located at the magnetic polar regions produce highly beamed emission generated by the electron cyclotron maser instability, the same mechanism known to generate planetary coherent radio emission in our solar system. The narrow beams of radiation pass our line of sight as the dwarf rotates, producing the associated periodic bursts. The resulting radio light curves are analogous to the periodic light curves associated with pulsar radio emission highlighting TVLM 513-46546 as the prototype of a new class of transient radio source.
description: 12 pages, 3 figures, accepted for publication in ApJ Letters
ТИЖOРAТ БAНКЛAРИ ВАЛЮТА OПЕРAЦИЯЛAРИГA ТAЪСИР ҚИЛУВЧИ OМИЛЛAРНИНГ ЭКOНOМЕТРИК ТAҲЛИЛИ
Creators: name: Болтаев, Тўлқин
Publisher: name: Zenodo
Year: 2023

description: Мақолада Ўзбекистон тижорат банклари валюта операциялари моҳияти ва таснифланиши, валюта операцияларини таҳлил қилиш масалалари, муддатли валюта операциялар эконометрик таҳлили ҳақида сўз боради.
STUDY ON FACTORS AFFECTING ADOPTION OF DIGITAL FINANCIAL SERVICES IN RURAL AREAS IN INDIA
Creators: name: ABHINAV HARDIYA
name: Dr. JITENDRA TALREJA
Publisher: name: Zenodo
Year: 2023
Subjects: ---

description: Abstract

The adoption of digital financial services (DFS) in rural areas is a multifaceted and evolving phenomenon influenced by a myriad of factors. This abstract provides an overview of the key determinants that shape the adoption of DFS in rural regions. In rural areas worldwide, access to formal financial services has traditionally been limited, often leading to financial exclusion and economic disparities. The advent of digital financial services, facilitated by mobile technology and the internet, has presented an opportunity to bridge this gap and enhance financial inclusion. However, the uptake of these services in rural settings is not uniform and is subject to a complex interplay of factors. Bridging the digital divide in rural areas requires concerted efforts from governments, financial institutions, and technology providers to create an enabling environment for the widespread adoption of digital financial services, thereby fostering financial inclusion and socioeconomic development.
Self-propulsion and self-navigation: Activity is a precursor to jamming
Creators: name: Casiulis, Mathias
name: Hexner, Daniel
name: Levine, Dov
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Traffic jams are an everyday hindrance to transport, and typically arise when many vehicles have the same or a similar destination. We show, however, that even when uniformly distributed in space and uncorrelated, targets have a crucial effect on transport. At modest densities an instability arises leading to jams with emergent correlations between the targets. By considering limiting cases of the dynamics which map onto active Brownian particles, we argue that motility induced phase separation is the precursor to jams. That is, jams are MIPS seeds that undergo an extra instability due to target accumulation. This provides a quantitative prediction of the onset density for jamming, and suggests how jamming might be delayed or prevented. We study the transition between jammed and flowing phase, and find that transport is most efficient on the cusp of jamming.
description: 18 pages, 22 figures. Ancillary files available
Negative Poisson's ratio materials via isotropic interactions
Creators: name: Rechtsman, Mikael C.
name: Stillinger, Frank H.
name: Torquato, Salvatore
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We show that under tension, a classical many-body system with only isotropic pair interactions in a crystalline state can, counterintutively, have a negative Poisson's ratio, or auxetic behavior. We derive the conditions under which the triangular lattice in two dimensions and lattices with cubic symmetry in three dimensions exhibit a negative Poisson's ratio. In the former case, the simple Lennard-Jones potential can give rise to auxetic behavior. In the latter case, negative Poisson's ratio can be exhibited even when the material is constrained to be elastically isotropic.
description: 10 pages, 2 figures, accepted in Physical Review Letters
About solving the Fechner-Stevens problem
Creators: name: Romanchak, Vasily
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences
subject: H.1.m
subject: 92-10

description: In this paper, we prove that the Fechner and Stevens laws are equivalent (coincide up to isomorphism). Therefore, the problem does not exist.
description: 7 pages
KIC5950759: a high-amplitude $δ$ Sct star with amplitude and frequency modulation near the terminal age main sequence
Creators: name: Bowman, D. M.
name: Hermans, J.
name: Daszyńska-Daszkiewicz, J.
name: Holdsworth, D. L.
name: Tkachenko, A.
name: Murphy, S. J.
name: Smalley, B.
name: Kurtz, D. W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Amongst the intermediate mass pulsating stars known as $δ$ Sct stars is a subset of high-amplitude and predominantly radial-mode pulsators known as high-amplitude $δ$ Sct (HADS) stars. From more than 2000 $δ$ Sct stars observed by the Kepler space mission, only two HADS stars were detected. We investigate the more perplexing of these two HADS stars, KIC5950759. We study its variability using ground- and space-based photometry, determine its atmospheric parameters from spectroscopy and perform asteroseismic modelling to constrain its mass and evolutionary stage. From spectroscopy, we find that KIC5950759 is a metal-poor star, which is in agreement with the inferred metallicity needed to reproduce its pulsation mode frequencies from non-adiabatic pulsation models. Furthermore, we combine ground-based WASP and Kepler space photometry, and measure a linear change in period of order $\dot{P}/P \simeq 10^{-6}$ yr$^{-1}$ for both the fundamental and first overtone radial modes across a time base of several years, which is at least two orders of magnitude larger than predicted by evolution models, and is the largest measured period change in a $δ$ Sct star to date. Our analysis indicates that KIC5950759 is a metal-poor HADS star near the short-lived contraction phase and the terminal-age main sequence, with its sub-solar metallicity making it a candidate SX Phe star. KIC5950759 is a unique object amongst the thousands of known $δ$ Sct stars and warrants further study to ascertain why its pulsation modes are evolving remarkably faster than predicted by stellar evolution.
description: 15 pages, accepted for publication in MNRAS