cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fully covariant and conformal formulation of the Z4 system in a reference-metric approach: comparison with the BSSN formulation in spherical symmetry
Creators: name: Sanchis-Gual, Nicolas
name: Montero, Pedro J.
name: Font, Jose A.
name: Mueller, Ewald
name: Baumgarte, Thomas W.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We adopt a reference-metric approach to generalize a covariant and conformal version of the Z4 system of the Einstein equations. We refer to the resulting system as ``fully covariant and conformal", or fCCZ4 for short, since it is well suited for curvilinear as well as Cartesian coordinates. We implement this fCCZ4 formalism in spherical polar coordinates under the assumption of spherical symmetry using a partially-implicit Runge-Kutta (PIRK) method and show that our code can evolve both vacuum and non-vacuum spacetimes without encountering instabilities. Our method does not require regularization of the equations to handle coordinate singularities, nor does it depend on constraint-preserving outer boundary conditions, nor does it need any modifications of the equations for evolutions of black holes. We perform several tests and compare the performance of the fCCZ4 system, for different choices of certain free parameters, with that of BSSN. Confirming earlier results we find that, for an optimal choice of these parameters, and for neutron-star spacetimes, the violations of the Hamiltonian constraint can be between 1 and 3 orders of magnitude smaller in the fCCZ4 system than in the BSSN formulation. For black-hole spacetimes, on the other hand, any advantages of fCCZ4 over BSSN are less evident.
description: 13 pages, 10 figures
Saxon and medieval Walton, Aylesbury: Excavations 1973-1974
Creators: name: Farley, Michael
Publisher: name: Archaeology Data Service
Year: 2023

description: Records of Buckinghamshire, 20 (2), 153-290
description: Prehistoric, Roman, Early Saxon (sunken houses, halls, pottery), tenth and eleventh century (pottery and finds, dating, Jettons)
New limit on Lorentz and CPT violating neutron spin interactions using a free precession 3He-129Xe co-magnetometer
Creators: name: Allmendinger, F.
name: Heil, W.
name: Karpuk, S.
name: Kilian, W.
name: Scharth, A.
name: Schmidt, U.
name: Schnabel, A.
name: Sobolev, Yu.
name: Tullney, K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We report on the search for a CPT and Lorentz invariance violating coupling of the 3He and 129Xe nuclear spins (each largely determined by a valence neutron) to background tensor fields which permeate the universe. Our experimental approach is to measure the free precession of nuclear spin polarized 3He and 129Xe atoms in a homogeneous magnetic guiding field of about 400 nT using LTC SQUIDs as low-noise magnetic flux detectors. As the laboratory reference frame rotates with respect to distant stars, we look for a sidereal modulation of the Larmor frequencies of the co-located spin samples. As a result we obtain an upper limit on the equatorial component of the background field interacting with the spin of the bound neutron bn< 6.7*10^-34 GeV (68% C.L.). Our result improves our previous limit (data measured in 2009) by a factor of 30 and the world's best limit by a factor of 5.
description: 5 pages, 2 figures. arXiv admin note: text overlap with arXiv:1011.2143
Approach to asymptotically diffusive behavior for Brownian particles in periodic potentials : extracting information from transients
Creators: name: Dean, David S.
name: Oshanin, Gleb
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A Langevin process diffusing in a periodic potential landscape has a time dependent diffusion constant which means that its average mean squared displacement (MSD) only becomes linear at late times. The long time, or effective diffusion constant, can be estimated from the slope of a linear fit of the MSD at late times. Due to the cross over between a short time microscopic diffusion constant, which is independent of the potential, to the effective late time diffusion constant, a linear fit of the MSD will not in general pass through the origin and will have a non-zero constant term. Here we address how to compute the constant term and provide explicit results for Brownian particles in one dimension in periodic potentials. We show that the constant is always positive and that at low temperatures it depends on the curvature of the minimum of the potential. For comparison we also consider the same question for the simpler problem of a symmetric continuous time random walk in discrete space. Here the constant can be positive or negative and can be used to determine the variance of the hopping time distribution.
description: 11 pages RevTex, 3 figure
Quantum Models for Psychological Measurements: An Unsolved Problem
Creators: name: Khrennikov, Andrei
name: Basieva, Irina
name: Dzhafarov, Ehtibar N.
name: Busemeyer, Jerome R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences
subject: 81V99

description: There has been a strong recent interest in applying quantum mechanics (QM) outside physics, including in cognitive science. We analyze the applicability of QM to two basic properties in opinion polling. The first property (response replicability) is that, for a large class of questions, a response to a given question is expected to be repeated if the question is posed again, irrespective of whether another question is asked and answered in between. The second property (question order effect) is that the response probabilities frequently depend on the order in which the questions are asked. Whenever these two properties occur together, it poses a problem for QM. The conventional QM with Hermitian operators can handle response replicability, but only in the way incompatible with the question order effect. In the generalization of QM known as theory of positive-operator-valued measures (POVMs), in order to account for response replicability, the POVMs involved must be conventional operators. Although these problems are not unique to QM and also challenge conventional cognitive theories, they stand out as important unresolved problems for the application of QM to cognition . Either some new principles are needed to determine the bounds of applicability of QM to cognition, or quantum formalisms more general than POVMs are needed.
description: 25 pages; submitted for publication
Does the Equivalence between Gravitational Mass and Energy Survive for a Composite Quantum Body?
Creators: name: Lebed, Andrei G.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We define passive and active gravitational mass operators of the simplest composite quantum body - a hydrogen atom. Although they do not commute with its energy operator, the equivalence between the expectation values of passive and active gravitational masses and energy is shown to survive for stationary quantum states. In our calculations of passive gravitational mass operator, we take into account not only kinetic and Coulomb potential energies but also the so-called relativistic corrections to electron motion in a hydrogen atom. Inequivalence between passive and active gravitational masses and energy at a macroscopic level is demonstrated to reveal itself as time dependent oscillations of the expectation values of the gravitational masses for superpositions of stationary quantum states. Breakdown of the equivalence between passive gravitational mass and energy at a microscopic level reveals itself as unusual electromagnetic radiation, emitted by macroscopic ensemble of hydrogen atoms, moved by small spacecraft with constant velocity in the Earth's gravitational field. We suggest the corresponding experiment on the Earth's orbit to detect this radiation, which would be the first direct experiment where quantum effects in general relativity are observed.
description: 10 pages, no figures. arXiv admin note: substantial text overlap with arXiv:1304.6106, arXiv:1311.2627, arXiv:1205.3134
Topological properties of the mesoscopic graphene plaquette: QSHE due to spin imbalance
Creators: name: Ostahie, B.
name: Nita, M.
name: Aldea, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the electronic properties of the confined honeycomb lattice in the presence of the intrinsic spin-orbit (ISO) interaction and perpendicular magnetic field, and report on uncommon aspects of the quantum spin Hall conductance corroborated by peculiar properties of the edge states. The ISO interaction induces two specific gaps in the Hofstadter spectrum, namely the 'weak' topological gap defined by Beugeling et al [Phys. Rev. B 86, 075118 (2012)], and spin-imbalanced gaps in the relativistic range of the energy spectrum. We analyze the evolution of the helical states with the magnetic field and with increasing Anderson disorder. The 'edge' localization of the spin-dependent states and its dependence on the disorder strength is shown. The quantum transport, treated in the Landauer-Büttiker formalism, reveals interesting new plateaus of the quantum spin Hall effect (QSHE), and also of the integer quantum Hall effect (IQHE), in the energy ranges corresponding to the spin-imbalanced gaps. The properties of the spin-dependent transmittance matrix that determine the symmetries with respect to the spin, energy and magnetic field of the longitudinal and transverse resistance are shown.
description: 24 pages, 12 figures
Observation of topological crystalline insulator surface states on (111)-oriented Pb$_{1-x}$Sn$_{x}$Se films
Creators: name: Polley, C. M.
name: Dziawa, P.
name: Reszka, A.
name: Szczerbakow, A.
name: Minikayev, R.
name: Domagala, J. Z.
name: Safaei, S.
name: Kacman, P.
name: Buczko, R.
name: Adell, J.
name: Berntsen, M. H.
name: Wojek, B. M.
name: Tjernberg, O.
name: Kowalski, B. J.
name: Story, T.
name: Balasubramanian, T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present angle resolved photoemission spectroscopy measurements of the surface states on in-situ grown (111) oriented films of Pb$_{1-x}$Sn$_{x}$Se, a three dimensional topological crystalline insulator. We observe surface states with Dirac-like dispersion at $\barΓ$ and $\bar{M}$ in the surface Brillouin zone, supporting recent theoretical predictions for this family of materials. We study the parallel dispersion isotropy and Dirac-point binding energy of the surface states, and perform tight-binding calculations to support our findings. The relative simplicity of the growth technique is encouraging, and suggests a clear path for future investigations into the role of strain, vicinality and alternative surface orientations in (Pb,Sn)Se compounds.
description: 5 pages, 4 figures
Matter may matter
Creators: name: Haghani, Zahra
name: Harko, Tiberiu
name: Sepangi, Hamid Reza
name: Shahidi, Shahab
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a gravitational theory in which the effective Lagrangian of the gravitational field is given by an arbitrary function of the Ricci scalar, the trace of the matter energy-momentum tensor, and the contraction of the Ricci tensor with the matter energy-momentum tensor. The matter energy-momentum tensor is generally not conserved, thus leading to the appearance of an extra-force, acting on massive particles in a gravitational field. The stability conditions of the theory with respect to local perturbations are also obtained. The cosmological implications of the theory are investigated, representing an exponential solution. Hence a Ricci tensor - energy-momentum tensor coupling may explain the recent acceleration of the Universe, without resorting to the mysterious dark energy.
description: Received an "Honorable Mention" in the Gravity Research Foundation Essay Contest 2014
title: Ανάπτυξη συστήματος περιβαλλοντικής διαχείρισης για λατομείο γύψου βασισμένο στο ISO 14000
Creators: name: Παγκαλου Μαρια
Publisher: name: Technical University of Crete
Year: 2023

description: Σκοπός της παρούσας διπλωματικής εργασίας είναι η παρουσίαση και η αξιολόγηση των αποτελεσμάτων, που προκύπτουν από την εφαρμογή συστήματος περιβαλλοντικής διαχείρισης ISO 14000, και συγκεκριμένα του ISO 14001:2015 σε λατομεία γύψου, για τη μείωση των περιβαλλοντικών επιπτώσεων, που προκαλούνται μέσω της λειτουργίας τους. Για την ανάλυση του περιβαλλοντικού συστήματος χρησιμοποιήθηκαν στοιχεία του λατομείου γύψου της Ιντερμπετόν Δομικά Υλικά Α.Ε. στη θέση Αλτσί, που βρίσκεται στην κοινότητα Λάστρου, στο νομό Λασιθίου της Κρήτης και έχει εφαρμόσει το σύστημα ISO 14001:2015.
Για την αξιολόγηση της απόδοσης του συστήματος ISO 14001:2015, χρησιμοποιήθηκαν δείκτες που σχετίζονται με τις επιμέρους περιβαλλοντικές επιδόσεις της επιχείρησης (κατανάλωση ενέργειας, νερού, λιπαντικών, ποιότητα αέρα, παραγόμενα απόβλητα κ.α.) και μελετήθηκε η διαχρονική τους εξέλιξη και ο βαθμός επίτευξης των αντίστοιχων στόχων που είχαν τεθεί.
Οι δείκτες που χρησιμοποιήθηκαν και μελετήθηκαν, ομαδοποιήθηκαν σε τέσσερις κατηγορίες, στην ομάδα των δεικτών που σχετίζονται με το περιβάλλον, με την ανακύκλωση, το ανθρώπινο δυναμικό και την κατανάλωση ενέργειας και νερού. Τα αποτελέσματα της ανάλυσης έδειξαν ότι έχει σημειωθεί σημαντική μείωση του περιβαλλοντικού αποτυπώματος με την εφαρμογή του συστήματος περιβαλλοντικής διαχείρισης, ενώ η χρήση τέτοιων δεικτών φάνηκε ότι είναι ένα εξαιρετικά αποτελεσματικό εργαλείο για την παρακολούθηση της περιβαλλοντικής απόδοσης του λατομείου και συμβάλλει στη συνεχή βελτίωση.
Trust e affidamenti fiduciari nel confronto tra "modello" sammarinese e italiano
Creators: name: Di Bona, Laura
Publisher: name: Cultura giuridica e diritto vivente
Year: 2018

description: [Trust and entrustments in the comparison between the “model” of San Marino and Italian] The essay shows that the San Marino system is endowed with a completeness and a capacity for adaptation to the becoming of a reality far greater than that of the neighboring Italian legal system, and this is also demonstrated in the discipline of trust and fiduciary assignments. In fact, in the Italian legal system, the principles of patrimonial responsibility, indivisibility of the patrimony, typical of the real rights, in addition to the prohibition of the commission pact and the successor pacts, have made the insertion of such institutions more difficult. On the other hand, in the Sammarinese system the architecture of the sources and the extraordinary role played by the common law facilitate a harmonious and natural regulation of the new operations emerging from the social and economic reality.

Key Words:
Trust, responsabilità patrimoniale, diritto comune
description: Cultura giuridica e diritto vivente, V. 5 (2018)
Las perspectivas futuras de la integración económica ¿Subsistencia o fortalecimiento? Especial referencia a la integración en América Latina y a las relaciones América Latina y Unión Europea
Creators: name: Coppelli Ortiz, Gerardo
Publisher: name: Cultura giuridica e diritto vivente
Year: 2018

description: [The future perspectives of economic integration, subsistence or strengthening? Special reference to integration in Latin America and relations with Latin America and the European Union] The commercial and economic interaction of the countries are the result of a determined commitment to facilitate trade and interaction through a set of agreements that regulate and facilitate this task. Latin America and the Caribbean, together with the European Union are today relevant actors in this. In the current scenario, what are the prospects for economic integration? Are we in a moment of consolidation of the integrationist model or a mere subsistence? These questions are answered in the present work, making an analysis of the Latin American integrationist reality, its relations with the European Union, with special mention to the association between Chile and the European Union.

Key Words:
Economic integration, Phases, Latin America and the Caribbean, European Union-Chile
description: Cultura giuridica e diritto vivente, V. 5 (2018)
Considerazioni introduttive e a margine di un convegno sulla piena giurisdizione
Creators: name: Iannotta, Lucio
Publisher: name: P.A. Persona e Amministrazione
Year: 2018

description: Il lavoro propone la lettura del procedimento e del processo amministrativo conforme all'art. 6 della Convenzione E.D.U. vivente nella giurisprudenza della Corte di Strasburgo, costituente norma interposta ex art. 117, 1° comma, Cost. nella interpretazione della Corte Costituzionale.

The essay proposes the reading of the Italian administrative procedures and process in compliance with art. 6 of the E.D.U. as arising from the jurisprudence of the Court of Strasbourg.

parole chiave: interpretazione - accertamento - procedimento - processo - persona

Keywords: interpretation – declaratory – procedure – process – human person
description: P.A. Persona e Amministrazione, N. 2 (2018)
Amministrazione e giurisdizione: poteri diversi o poteri concorrenti?
Creators: name: Cortese, Fulvio
Publisher: name: P.A. Persona e Amministrazione
Year: 2018

description: Il sindacato giurisdizionale sull’azione amministrativa è condizionato dal modo con cui si interpreta il principio di separazione dei poteri. A sua volta, questo principio funziona in modo diverso a seconda dell’ordinamento di riferimento e dei principi prevalenti in esso affermati. Il presente contributo prende spunto da alcune classiche elaborazioni dottrinali e da recenti orientamenti giurisprudenziali per illustrare le interazioni esistenti tra il principio di separazione dei poteri, l’ordinamento giuridico di riferimento e la profondità del sindacato giurisdizionale sull’azione amministrativa. Tali interazioni sono destinate ad essere molto complesse allorché i contesti normativi di riferimento siano più di uno.

The judicial review on administrative action is influenced by the way in which the principle of separation of powers is interpreted. At the same time, the principle of separation of powers works differently depending on the legal system concerned and on the prevailing principles established therein. The essay is inspired by some legal scholars’ classic elaborations and by some recent judgements. It aims at illustrating the interactions between the principle of separation of powers, the legal system concerned and the depth of the judicial review on administrative action. These interactions are bound to be very complex when legal systems involved are more than one.

Parole chiave: amministrazione – giurisdizione – separazione dei poteri – sindacato giurisdizionale sull’azione amministrativa – interazioni

Keywords: Public Administration – Judiciary – Separation of Powers – Judicial Review of Administrative Action – Interactions
description: P.A. Persona e Amministrazione, N. 2 (2018)
Thermodynamics of bosons systems related to Dunkl differential-difference operators
Creators: name: Ubriaco, Marcelo R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the thermodynamics of systems based on a Fock space representation inspired by the differential-difference operators proposed in Ref. \cite{Dunkl}. We calculate thermodynamic functions as the entropy and heat capacity and compare them with the standard boson case. A calculation of the second virial coefficient and the scalar curvature in two and three dimensions show that these systems becomes repulsive within an interval of negative values of the reflection operator parameter $μ_0$. In addition, the stability of this system is examined as a function of $μ_0$
description: 14 pages, 7 figures
Ultra-faint high-redshift galaxies in the Frontier Fields
Creators: name: Yue, Bin
name: Ferrara, Andrea
name: Vanzella, Eros
name: Salvaterra, Ruben
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: By combining cosmological simulations with Frontier Fields project lens models we find that, in the most optimistic case, galaxies as faint as $m \approx 33 - 34$ (AB magnitude at $1.6 \rm μm$) can be detected in the Frontier Fields. Such faint galaxies are hosted by dark matter halos of mass $\sim10^9 M_\odot$ and dominate the ionizing photon budget over currently observed bright galaxies, thus allowing for the first time the investigation of the dominant reionization sources. In addition, the observed number of these galaxies can be used to constrain the role of feedback in suppressing star formation in small halos: for example, if galaxy formation is suppressed in halos with circular velocity $v_c < 50$ km s$^{-1}$, galaxies fainter than $m=31$ should not be detected in the FFs.
description: 5 pages, 7 figures, accepted for publication in MNRAS Letters
title: Exploring for the Future AEM workshop: Perth, 2022
Creators: name: A., Ray
name: K., Czarnota
name: K., Gessner
name: Y., LeyCooper
name: A., Ray
name: S., Wong
name: N., Symington
Publisher: name: Commonwealth of Australia (Geoscience Australia)
Year: 2022
Subjects: subject: GEOLOGY
subject: Electrical and Electromagnetic Methods in Geophysics
subject: GEOPHYSICS
subject: Basin Analysis
subject: EFTF - Exploring for the Future
subject: AEM Acquisition
subject: AEM Interpretation
subject: inverse theory
subject: Airborne Electromagnetics - AEM
subject: HiQGA.jl
subject: Integrating geophysics and geology
subject: Published_External

description: As part of the Exploring For the Future program 2022 showcase, Geoscience Australia (GA) in collaboration with the Australian Institute of Geoscientists held an Airborne Electromagnetics (AEM) workshop in Perth on 11th August 2022. The workshop comprised the following: - An introduction to GA's 20 km spaced continent-wide AusAEM program, by Karol Czarnota - How the Western Australia government has successfully used 20 km spaced AEM data, by Klaus Gessner - An introduction to AEM, surveying, and quality control given by Yusen Ley-Cooper - An introduction to inverse theory presented by Anandaroop Ray - Hands-on AEM modeling and inversion using HiQGA.jl by Anandaroop Ray - Integrating geophysics and geology in subsurface interpretation, by Sebastian Wong - Avoiding the 10 most common pitfalls in AEM interpretation according to Neil Symington YoutTube video from the workshop, as well as data and code to follow along with the videos can be found on GA's GitHub at this link.
L’art. 6 Cedu e la continuità tra procedimento e processo
Creators: name: Allena, Miriam
Publisher: name: P.A. Persona e Amministrazione
Year: 2018

description: Il lavoro affronta il tema delle garanzie dell’art. 6 CEDU e delle modalità della loro attuazione nel procedimento e nel processo amministrativo. Dopo avere dato conto dei profili di teoria generale del diritto sottesi all’idea della possibilità di compensare ex post, in sede giurisdizionale, le garanzie non accordate nella fase procedimentale, si analizzano le principali incertezze applicative che da tale visione discendono.

The paper addresses the applicability of the guarantees laid down by Art. 6 of the ECHR to administrative procedure and trial. After analysing the general legal principles on which the idea of ex post compensation (i.e. the possibility for the judicial phase to compensate the lack of guarantees during the administrative phase) is rooted, it focuses on the main critical issues raised by this approach.

Parole chiave: continuità tra procedimento e processo – profili di teoria generale – compensazione ex post – incertezze generate dalla compensazione ex post

Keywords: continuum between administrative procedure and trial – ex post compensation – general legal principles – critical issues raised by the ex post compensation
description: P.A. Persona e Amministrazione, N. 2 (2018)
Revealing the large nuclear dust structures in NGC 1068 with MIDI/VLTI
Creators: name: López-Gonzaga, N.
name: Jaffe, W.
name: Burtscher, L.
name: Tristram, K. R. W.
name: Meisenheimer, K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: To understand the relation between the small "obscuring torus" and dusty structures at larger scales (5-10 pc) in NGC 1068, we use ESO's Mid-Infrared Interferometer (MIDI) with the 1.8 m Auxiliary Telescopes to achieve the necessary spatial resolution (~ 20-100 millarcsec). We use the chromatic phases in the data to improve the spatial fidelity of the analysis. We present interferometric data for NGC 1068 obtained in 2007 and 2012. We find no evidence of source variability. Many (u,v) points show non-zero chromatic phases indicating significant asymmetries. Gaussian model fitting of the correlated fluxes and chromatic phases provides a 3-component best fit with estimates of sizes, temperatures and positions of the components. A large, warm, off-center component is required at a distance approximately 90 mas to the north-west at a PA ~ -18 deg. The dust at 5-10 pc in the polar region contributes 4 times more to the mid-infrared flux at 12 um than the dust located at the center. This dust may represent the inner wall of a dusty cone. If similar regions are heated by the direct radiation from the nucleus, then they will contribute substantially to the classification of many Seyfert galaxies as Type 2. Such a region is also consistent in other Seyfert galaxies (the Circinus galaxy, NGC 3783 and NGC 424).
description: 21 pages, 10 figures; Accepted for publication on A&A
On the Effect of Pre-training for Transformer in Different Modality on Offline Reinforcement Learning
Creators: name: Takagi, Shiro
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: We empirically investigate how pre-training on data of different modalities, such as language and vision, affects fine-tuning of Transformer-based models to Mujoco offline reinforcement learning tasks. Analysis of the internal representation reveals that the pre-trained Transformers acquire largely different representations before and after pre-training, but acquire less information of data in fine-tuning than the randomly initialized one. A closer look at the parameter changes of the pre-trained Transformers reveals that their parameters do not change that much and that the bad performance of the model pre-trained with image data could partially come from large gradients and gradient clipping. To study what information the Transformer pre-trained with language data utilizes, we fine-tune this model with no context provided, finding that the model learns efficiently even without context information. Subsequent follow-up analysis supports the hypothesis that pre-training with language data is likely to make the Transformer get context-like information and utilize it to solve the downstream task.
description: 48 pages. Published in NeurIPS 2022
Full jurisdiction e diritto di polizia
Creators: name: Rota, Francesco
Publisher: name: P.A. Persona e Amministrazione
Year: 2018

description: Il presente studio cerca di analizzare le peculiarità della full jurisdiction nel diritto di polizia, cercando di mettere in evidenza i limiti previsti dall’ordinamento europeo al ricorso della full jurisdiction nel diritto di polizia e i limiti intrinsecamente connessi allo stesso diritto di polizia. Allo stesso tempo lo studio affronta il problema di un’eventuale continuità tra procedimento e processo nel diritto di polizia.

This study analyzes  the peculiarities of the full jurisdiction in police law. It highlights the limits to the use of full jurisdiction in police law and addresses the sensitive issue of continuity between the procedure and process in police law.

Parole chiave: Full jurisdiction, diritto di polizia, discrezionalità, procedimento, processo.

Keywords: Full Jurisdiction, police law, administrative discretion, procedure, process.
description: P.A. Persona e Amministrazione, N. 2 (2018)
From an Identity Process Theory Perspective: A Daily Investigation of Why and When Ostracism Triggers Ingratiation
Creators: name: Hou, Liang
name: Gu, Xixi
name: Dgfhnu
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Psychology
subject: FOS: Psychology
subject: School Psychology
subject: Social and Behavioral Sciences

description: Although existing studies suggest the relationship between ostracism and ingratiation, the knowledge about why and when ostracism promotes ingratiatory behaviors remains limited. Drawing from identity process theory, the current study examines the influence of ostracism on ingratiatory behaviors through the mediating role of self-identity threat on a daily timescale and the cross-level moderation of core self-evaluation. Through a diary study of 117 Chinese college students across 14 consecutive days, we found that daily ostracism had a positive indirect effect on daily ingratiatory behaviors through daily self-identity threat. Core self-evaluation of students weakened the indirect effect, such that only students with low core self-evaluation engaged in daily ingratiatory behaviors to cope with self-identity threat from ostracism. More importantly, supplemental analyses suggested that averaged daily ingratiatory behaviors were negatively related to perceived ostracism one week later.
Low field magnetic response of the non-centrosymmetric superconductor YPtBi
Creators: name: Bay, T. V.
name: Jackson, M.
name: Paulsen, C.
name: Baines, C.
name: Amato, A.
name: Orvis, T.
name: Aronson, M. C.
name: Huang, Y. K.
name: de Visser, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The low-field magnetic response of the non-centrosymmetric superconductor YPtBi ($T_c =0.77$ K) is investigated. Ac-susceptibility and dc-magnetization measurements provide solid evidence for bulk superconductivity with a volume fraction of $\sim 70\%$. The lower critical field is surprisingly small: $B_{c1} = 0.008$ mT $(T \rightarrow 0)$. Muon spin rotation experiments in a transverse magnetic field of 0.01 T show a weak increase of the Gaussian damping rate $σ_{TF}$ below $T_c$, which yields a London penetration depth $λ= 1.6 \pm 0.2~ μ$m. The zero-field Kubo-Toyabe relaxation rate $σ_{KT}$ equals $0.129 \pm 0.004~μ$s$^{-1}$ and does not show a significant change below $T_c$. This puts an upper bound of 0.04 mT on the spontaneous magnetic field associated with a possible odd-parity component in the superconducting order parameter.
description: preprint 10 pages, including 8 figures; accepted for publication in Solid State Communications
Spectroscopy of the frustrated quantum antiferromagnet Cs$_2$CuCl$_4$
Creators: name: Fumega, Adolfo O.
name: Wong, D.
name: Schulz, C.
name: Rodríguez, F.
name: Blanco-Canosa, S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate the electronic structure of Cs$_2$CuCl$_4$, a material discussed in the framework of a frustrated quantum antiferromagnet, by means of resonant inelastic x-ray scattering (RIXS) and Density Functional Theory (DFT). From the non-dispersive highly localized dd excitations, we resolve the crystal field splitting of the Cu$^{2+}$ ions in a strongly distorted tetrahedral coordination. This allows us to model the RIXS spectrum within the Crystal Field Theory (CFT), assign the dd orbital excitations and retrieve experimentally the values of the crystal field splitting parameters D$_q$, D$_s$ and D$_τ$. The electronic structure obtained ab-initio agrees with the RIXS spectrum and modelled by CFT, highlighting the potential of combined spectroscopic, cluster and DFT calculations to determine the electronic ground state of complex materials.
description: 7 pages, 4 figures
Thick brane models in generalized mimetic gravity
Creators: name: Lobão, A. S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work, we investigate braneworld models in mimetic gravity, with the source field having generalized dynamics. We present the mathematical description necessary to study the generalized model and consider the first-order formalism to solve the equations of motion. We also investigate the linear stability of the gravitational sector to verify that the model is stable. In particular, we consider two specific situations where we were able to get exact solutions with a kink-like profile and calculate several important properties of the brane.
Full jurisdiction e limite dei poteri non ancora esercitati. Brevi note
Creators: name: Trimarchi, Michele
Publisher: name: P.A. Persona e Amministrazione
Year: 2018

description: L’articolo si interroga sinteticamente sulla compatibilità del sindacato di full jurisdiction con il principio della separazione dei poteri e, più esattamente, con il tradizionale divieto per il giudice di farsi amministratore. Il tema è affrontato esaminando l’art. 34, comma 2, del codice del processo amministrativo, per il quale “in nessun caso il giudice si può pronunciare su poteri amministrativi non ancora esercitati”. Attraverso l’interpretazione di questa disposizione, l’autore ricostruisce il contenuto del divieto per il giudice di farsi amministratore e conclude nel senso che il sindacato di full jurisdiction non è in contrasto con questo divieto.

The paper examines the full jurisdiction judicial review on administrative decisions having regard to the constitutional principle of separation of powers, whereby the judge does not have power to replace administrative decisions. Under Article 34(2) of the Italian Code of administrative procedure, indeed, the administrative judge is prevented from ruling on administrative powers which have not yet been exercised. By providing a thorough analysis of this provision, the paper clarifies the scope of the prohibition for the judge to take the place of the administration and concludes that full jurisdiction is not in conflict with such a prohibition .

Parole chiave: giurisdizione piena, poteri non esercitati, separazione dei poteri, Corte Edu, codice processo amministrativo

Keywords: full jurisdiction, non exercised powers, separation of powers, European Court of Human Rights, administrative procedure code
description: P.A. Persona e Amministrazione, N. 2 (2018)
RIS-Enabled SISO Localization under User Mobility and Spatial-Wideband Effects
Creators: name: Keykhosravi, Kamran
name: Keskin, Musa Furkan
name: Seco-Granados, Gonzalo
name: Popovski, Petar
name: Wymeersch, Henk
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Reconfigurable intelligent surface (RIS) is a promising technological enabler for the 6th generation (6G) of wireless systems with applications in localization and communication. In this paper, we consider the problem of positioning a single-antenna user in 3D space based on the received signal from a single-antenna base station and reflected signal from an RIS by taking into account the mobility of the user and spatial-wideband (WB) effects. To do so, we first derive the spatial-WB channel model under the far-field assumption, for orthogonal frequency-division multiplexing signal transmission with the user having a constant velocity. We derive the Cramer Rao bounds to serve as a benchmark. Furthermore, we devise a low-complexity estimator that attains the bounds in high signal-to-noise ratios. Our estimator neglects the spatial-WB effects and deals with the user mobility by estimating the radial velocities and compensating for their effects in an iterative fashion. We show that the spatial-WB effects can degrade the localization accuracy for large RIS sizes and large signal bandwidths as the direction of arrival or departure deviate from the RIS normal. In particular, for a 64X64 RIS, the proposed estimator is resilient against the spatial-WB effects up to 140 MHz bandwidth. Regarding user mobility, our results suggest that the velocity of the user influences neither the bounds nor the accuracy of our estimator. Specifically, we observe that the state of the user with a high speed (42 m/s) can be estimated virtually with the same accuracy as a static user.
Atomic jet from SMM1 (FIRS1) in Serpens uncovers non-coeval binary companion
Creators: name: Dionatos, O.
name: Jørgensen, J. K.
name: Teixeira, P. S.
name: Güdel, M.
name: Bergin, E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report on the detection of an atomic jet associated with the protostellar source SMM1 (FIRS1) in Serpens. The jet is revealed in [FeII] and [NeII] line maps observed with Spitzer/IRS, and further confirmed in HiRes IRAC and MIPS images. It is traced very close to SMM1 and peaks at ~5 arcsec" from the source at a position angle of $\sim 125 degrees. In contrast, molecular hydrogen emission becomes prominent at distances > 5" from the protostar and extends at a position angle of 160 degrees. The morphological differences suggest that the atomic emission arises from a companion source, lying in the foreground of the envelope surrounding the embedded protostar SMM1. In addition the molecular and atomic Spitzer maps disentangle the large scale CO (3-2) emission observed in the region into two distinct bipolar outflows, giving further support to a proto-binary source setup. Analysis at the peaks of the [FeII] jet show that emission arises from warm and dense gas (T ~1000 K, n(electron) 10^5 - 10^6 cm^-3). The mass flux of the jet derived independently for the [FeII] and [NeII] lines is 10^7 M(sun)/yr, pointing to a more evolved Class~I/II protostar as the driving source. All existing evidence converge to the conclusion that SMM1 is a non-coeval proto-binary source.
description: 10 pages, 7 figures, 1 table. Accepted for publication in Astronomy \& Astrophysics
Knowledge distillation for fast and accurate DNA sequence correction
Creators: name: Belyaeva, Anastasiya
name: Shor, Joel
name: Cook, Daniel E.
name: Shafin, Kishwar
name: Liu, Daniel
name: Töpfer, Armin
name: Wenger, Aaron M.
name: Rowell, William J.
name: Yang, Howard
name: Kolesnikov, Alexey
name: McLean, Cory Y.
name: Nattestad, Maria
name: Carroll, Andrew
name: Chang, Pi-Chuan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Genomics (q-bio.GN)
subject: Machine Learning (cs.LG)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: Accurate genome sequencing can improve our understanding of biology and the genetic basis of disease. The standard approach for generating DNA sequences from PacBio instruments relies on HMM-based models. Here, we introduce Distilled DeepConsensus - a distilled transformer-encoder model for sequence correction, which improves upon the HMM-based methods with runtime constraints in mind. Distilled DeepConsensus is 1.3x faster and 1.5x smaller than its larger counterpart while improving the yield of high quality reads (Q30) over the HMM-based method by 1.69x (vs. 1.73x for larger model). With improved accuracy of genomic sequences, Distilled DeepConsensus improves downstream applications of genomic sequence analysis such as reducing variant calling errors by 39% (34% for larger model) and improving genome assembly quality by 3.8% (4.2% for larger model). We show that the representations learned by Distilled DeepConsensus are similar between faster and slower models.
Carbon monoxide and water vapor in the atmosphere of the non-transiting exoplanet HD 179949 b
Creators: name: Brogi, M.
name: de Kok, R. J.
name: Birkby, J. L.
name: Schwarz, H.
name: Snellen, I. A. G.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: (Abridged) In recent years, ground-based high-resolution spectroscopy has become a powerful tool for investigating exoplanet atmospheres. It allows the robust identification of molecular species, and it can be applied to both transiting and non-transiting planets. Radial-velocity measurements of the star HD 179949 indicate the presence of a giant planet companion in a close-in orbit. Here we present the analysis of spectra of the system at 2.3 micron, obtained at a resolution of R~100,000, during three nights of observations with CRIRES at the VLT. We targeted the system while the exoplanet was near superior conjunction, aiming to detect the planet's thermal spectrum and the radial component of its orbital velocity. We detect molecular absorption from carbon monoxide and water vapor with a combined S/N of 6.3, at a projected planet orbital velocity of K_P = (142.8 +- 3.4) km/s, which translates into a planet mass of M_P = (0.98 +- 0.04) Jupiter masses, and an orbital inclination of i = (67.7 +- 4.3) degrees, using the known stellar radial velocity and stellar mass. The detection of absorption features rather than emission means that, despite being highly irradiated, HD 179949 b does not have an atmospheric temperature inversion in the probed range of pressures and temperatures. Since the host star is active (R_HK > -4.9), this is in line with the hypothesis that stellar activity damps the onset of thermal inversion layers owing to UV flux photo-dissociating high-altitude, optical absorbers. Finally, our analysis favors an oxygen-rich atmosphere for HD 179949 b, although a carbon-rich planet cannot be statistically ruled out based on these data alone.
description: 10 pages, 9 figures. Accepted for publication in Astronomy and Astrophysics
Gender Bias in Big Data Analysis
Creators: name: Misa, Thomas J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences
subject: J.4; K.2; K.4; K.7

description: This article combines humanistic "data critique" with informed inspection of big data analysis. It measures gender bias when gender prediction software tools (Gender API, Namsor, and Genderize.io) are used in historical big data research. Gender bias is measured by contrasting personally identified computer science authors in the well-regarded DBLP dataset (1950-1980) with exactly comparable results from the software tools. Implications for public understanding of gender bias in computing and the nature of the computing profession are outlined. Preliminary assessment of the Semantic Scholar dataset is presented. The conclusion combines humanistic approaches with selective use of big data methods.
description: 27 pages, 1 figure, 3 tables
Spin liquid phase in a spatially anisotropic frustrated antiferromagnet
Creators: name: Merino, Jaime
name: Holt, Michael
name: Powell, Ben J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We explore the effect of the third nearest-neighbors on the magnetic properties of the Heisenberg model on an anisotropic triangular lattice. We obtain the phase diagram of the model using Schwinger-boson mean-field theory. Competition between Néel, spiral and collinear magnetically ordered phases is found as we vary the on the ratios of the nearest, J1, next-nearest, J2, and third-nearest, J_3, neighbor exchange couplings. A spin liquid phase is stabilized between the spiral and collinear ordered states when J2/J1 < 1.8 for rather small J3/J1 < 0.1. The lowest energy two-spinon dispersions relevant to neutron scattering experiments are analyzed and compared to semiclassical magnon dispersions finding significant differences in the spiral and collinear phases between the two approaches. The results are discussed in the context of the anisotropic triangular materials: Cs2CuCl4 and Cs2CuBr4 and layered organic materials, kappa-(BEDT-TTF)2X and Y[Pd(dmit)2]2.
description: 11 pages, 9 figures
Effective non-retarded method as a tool for the design of tunable nanoparticle composite absorbers
Creators: name: Ortiz, Guillermo
name: Inchaussandague, Marina
name: Skigin, Diana
name: Depine, Ricardo
name: Mochán, Luis
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We investigate the capabilities of the effective non-retarded method (ENR) to explore and design nanoparticles composites with specific optical properties. We consider a composite material comprising periodically distributed metallic spheres in a dielectric host matrix. The effective macroscopic dielectric function of the composite medium is obtained by means of the ENR and is used to calculate the electromagnetic response of a slab made of such an inhomogeneous material. This response is compared with that obtained using the Korringa-Kohn-Rostoker wave calculation method (KKR). We analyze the optical properties for different filling fractions, especially in the vicinity of the resonance frequencies of the macroscopic dielectric function. We show that appropriately choosing the parameters of the composite it is possible to achieve a tunable absorber film. The ENR results to be a versatile tool for the design of nanoparticle composite materials with specific properties.
description: 16 pages, 7 figures, revised