cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Three-Dimensional Multi-Relaxation Time (MRT) Lattice-Boltzmann Models for Multiphase Flow
Creators: name: Premnath, Kannan N.
name: Abraham, John
Publisher: name: arXiv
Year: 2006
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: In this paper, three-dimensional (3D) multi-relaxation time (MRT) lattice-Boltzmann (LB) models for multiphase flow are presented. In contrast to the Bhatnagar-Gross-Krook (BGK) model, a widely employed kinetic model, in MRT models the rates of relaxation processes owing to collisions of particle populations may be independently adjusted. As a result, the MRT models offer a significant improvement in numerical stability of the LB method for simulating fluids with lower viscosities. We show through the Chapman-Enskog multiscale analysis that the continuum limit behavior of 3D MRT LB models corresponds to that of the macroscopic dynamical equations for multiphase flow. We extend the 3D MRT LB models developed to represent multiphase flow with reduced compressibility effects. The multiphase models are evaluated by verifying the Laplace-Young relation for static drops and the frequency of oscillations of drops. The results show satisfactory agreement with available data and significant gains in numerical stability.
description: Accepted for publication in the Journal of Computational Physics
Teaching afterthoughts_A reflexive thematic analysis of teachers' narrative experience on reflection through Lesson Study towards learning outcomes.pdf
Creators: name: Coronado, Lito
Publisher: name: figshare
Year: 2021
Subjects: subject: Education
subject: 130303 Education Assessment and Evaluation
subject: FOS: Educational sciences

description: This article contains chapters 1, 2 and 3 of a dissertation study that aims to underscore the perspective of teachers and school leaders on the use of reflection through Lesson Study as means towards meeting desired learning outcomes of the students. This is a case study following qualitative design anchored on variation and constructivism theories. Data will be gathered using in-depth interview via mediated communication platform. The data will be analyzed using reflexive thematic analysis (Braun and Clarke, 2019).
Stabilization of lifted hydrogen jet diffusion flame in a vitiated co-flow: effects of jet and coflow velocities, coflow temperature and mixing
Creators: name: De, Santanu
name: De, Ashoke
name: Jaiswal, Abhishek
name: Dash, Arpita
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The present paper reports on the numerical investigation of lifted turbulent jet flames with H2/N2 fuel issuing into a vitiated coflow of lean combustion products of H2/air using conditional moment closure method (CMC). A 2D axisymmetric formulation has been used for the predictions of fluid flow, while CMC equations are solved with detailed chemistry to represent the turbulence-chemistry interaction. Simulations are carried out for different coflow temperatures, jet and coflow velocities in order to investigate the impact on the flame lift-off height as well as on the flame stabilization. Furthermore, the role of conditional velocity models on the flame has also been investigated. In addition, the effect of mixing is investigated over a range of coflow temperatures and the stabilization mechanism is determined from the analysis of the transport budgets. It is found that the lift-off height is highly sensitive to the coflow temperature, while the predicted lift-off height using the mixing model constant, i.e., CΦ=4, is found to be the closest to the experimental results. For all the coflow temperatures, the balance is found between the chemical, axial convection and molecular diffusion terms while the contribution from axial and radial diffusion is negligible, thus indicating auto-ignition as the flame stabilization mechanism.
Federal choice of policy instruments in the Canada green plan
Creators: name: Albert, Karin H.
Publisher: name: University of British Columbia
Year: 2008

description: The Green Plan, Canada's six year environmental agenda, has now guided Canadian environmental policy for over a year and a half. In that time span, a large number of environmental initiatives have been announced under the Green Plan, and an even larger number are still promised. However, not every initiative contributes equally to preventing or abating pollution. The extent to which an initiative contributes directly to an improvement in environmental quality depends on the level of coercion of the policy instrument it employs. Initiatives which involve relatively coercive policy instruments, in particular regulatory action, are more likely to achieve their goal in the immediate future than initiatives which rely largely on persuasion such as guidelines and public education. The classification of the policy instruments in the Green Plan reveals a strong preference on the part of the federal government for non-coercive over coercive instruments. Only 13 per cent of the Green Plan initiatives involve regulatory action. The majority involve increasing capacity which means that the initiatives centre around research, studies, monitoring and plan development. The Fraser River Action Plan, a Green Plan initiative announced in June 1991, reflects the same federal preference for capacity increasing instruments as the larger Green Plan. Several variables help to explain this preference: constitutional constraints, pressure from other levels of government, opposition from industry, and environmental interest group pressure. Both the events leading up to the Green Plan and the implementation of the Fraser River Action Plan, suggest that the strongest motivating factor for the choice of policy instruments is the concern to avoid blame from the interests affected by a particular initiative. In practice, this means that the federal government is reluctant to make use of its regulatory authority to impose clean-up costs on the polluting industry. It also avoids to interfere with provincial jurisdiction over natural resources. In order to avoid blame from environmental groups and the public, who demand tighter pollution controls, the government relies on symbolic actions. Symbolic actions enable the government to show its concern but postpone pollution abatement to a later date. Federal reluctance to make use of its full constitutional authority in the area of environmental policy making combined with the large budget cuts the Green Plan has seen during its relatively short period of existence, belies the federal commitment to protecting the environment.
Quasi-Normal Modes of Brane-Localised Standard Model Fields II: Kerr Black Holes
Creators: name: Kanti, P.
name: Konoplya, R. A.
name: Zhidenko, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This paper presents a comprehensive study of the fundamental quasinormal modes of all Standard Model fields propagating on a brane embedded in a higher-dimensional rotating black hole spacetime. The equations of motion for fields with spin $s=0, 1/2$ and 1 propagating in the induced-on-the-brane background are solved numerically, and the dependence of their QN spectra on the black hole angular momentum and dimensionality of spacetime is investigated. It is found that the brane-localised field perturbations are longer-lived when the higher-dimensional black hole rotates faster, while an increase in the number of transverse-to-the-brane dimensions reduces their lifetime. Finally, the quality factor $Q$, that determines the best oscillator among the different field perturbations, is investigated and found to depend on properties of both the particular field studied (spin, multipole numbers) and the gravitational background (dimensionality, black hole angular momentum number).
description: 12 pages, 8 figures, typos corrected, version to appear in Phys. Rev. D
Kawaiisu Conversations and Landscapes Project
Creators: name: Girado, Luther
name: Hernandez, Betty
name: Hicks, Lucille
name: Marine, Mandy
name: Grant, Laura
name: Turner, Julie
name: Ahlers, Jocelyn
name: Bohna, Lois Conner
name: Bourdon, Anne
name: Clark, Sandy
name: Durham, Kim
name: Everson, Merlene
name: Grant Smith, Amanda
name: Hammond, Jon
name: Harkins, Ron
name: Hicks, Josh
name: Tex, Carly
name: Tex, Julie
name: Turner, David
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021

description: Audio and video recordings of conversations and texts
TRTAR: Transmissive RIS-assisted Through-the-wall Human Activity Recognition
Creators: name: Liu, Junshuo
name: Huang, Yunlong
name: Zhang, Jianan
name: Xiong, Rujing
name: Qiu, Robert Caiming
Publisher: name: arXiv
Year: 2024
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Device-free human activity recognition plays a pivotal role in wireless sensing. However, current systems often fail to accommodate signal transmission through walls or necessitate dedicated noise removal algorithms. To overcome these limitations, we introduce TRTAR: a device-free passive human activity recognition system integrated with a transmissive reconfigurable intelligent surface (RIS). TRTAR eliminates the necessity for dedicated devices or noise removal algorithms, while specifically addressing signal propagation through walls. Unlike existing approaches, TRTAR solely employs a transmissive RIS at the transmitter or receiver without modifying the inherent hardware structure. Experimental results demonstrate that TRTAR attains an average accuracy of 98.13% when signals traverse concrete walls.
Super-leading logarithms in non-global observables in QCD?
Creators: name: Forshaw, J. R.
name: Kyrieleis, A.
name: Seymour, M. H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We reconsider the calculation of a non-global QCD observable and find the possible breakdown of QCD coherence. This breakdown arises as a result of wide angle soft gluon emission developing a sensitivity to emission at small angles and it leads to the appearance of super-leading logarithms. We use the `gaps between jets' cross-section as a concrete example and illustrate that the new logarithms are intimately connected with the presence of Coulomb gluon contributions. We present some rough estimates of their potential phenomenological significance.
description: 21 pages, 7 figures
Coherence scale of magnetic fields generated in early-time forward shocks of GRBs
Creators: name: Jordana-Mitjans, N.
name: Mundell, C. G.
name: Smith, R. J.
name: Guidorzi, C.
name: Marongiu, M.
name: Kobayashi, S.
name: Gomboc, A.
name: Shrestha, M.
name: Steele, I. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report the earliest-ever detection of optical polarization from a GRB forward shock (GRB 141220A), measured $129.5-204.3\,$s after the burst using the multi-colour RINGO3 optical polarimeter on the 2-m fully autonomous robotic Liverpool Telescope. The temporal decay gradient of the optical light curves from $86\,$s to $\sim 2200\,$s post-burst is typical of classical forward shocks with $α= 1.091 \pm 0.008$. The low optical polarization $P_{BV} = 2.8_{- 1.6} ^{+ 2.0} \, \%$ (2$σ$) at mean time $\sim 168\,$s post-burst is compatible with being induced by the host galaxy dust ($A_{V, {\rm HG}}= 0.71 \pm 0.15 \,$mag), leaving low polarization intrinsic to the GRB emission itself -- as theoretically predicted for forward shocks and consistent with previous detections of low degrees of optical polarization in GRB afterglows observed hours to days after the burst. The current sample of early-time polarization data from forward shocks suggests polarization from (a) the Galactic and host galaxy dust properties (i.e. $P \sim 1\%-3\%$), (b) contribution from a polarized reverse shock (GRB deceleration time, jet magnetization) or (c) forward shock intrinsic polarization (i.e. $P \leq 2\%$), which depends on the magnetic field coherence length scale and the size of the observable emitting region (burst energetics, circumburst density).
Dynamics of upstream flame propagation in a hydrogen-enriched premixed flame
Creators: name: De, Ashoke
name: Acharya, Sumanta
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: An unconfined strongly swirled flow is investigated to study the effect of hydrogen addition on upstream flame propagation in a methane-air premixed flame using Large Eddy Simulation (LES) with a Thickened Flame (TF) model. A laboratory-scale swirled premixed combustor operated under atmospheric conditions for which experimental data for validation is available has been chosen for the numerical study. In the LES-TF approach, the flame front is resolved on the computational grid through artificial thickening and the individual species transport equations are directly solved with the reaction rates specified using Arrhenius chemistry. Good agreement is found when comparing predictions with the published experimental data including the predicted RMS fluctuations. Also, the results show that the initiation of upstream flame propagation is associated with balanced maintained between hydrodynamics and reaction. This process is associated with the upstream propagation of the center recirculation bubble, which pushes the flame front in the upstream mixing tube. Once the upstream movement of the flame front is initiated, the hydrogen-enriched mixture exhibits more unstable behavior; while in contrast, the CH4 flame shows stable behavior.
description: arXiv admin note: text overlap with arXiv:2101.09200
Machine learning a fixed point action for SU(3) gauge theory with a gauge equivariant convolutional neural network
Creators: name: Holland, Kieran
name: Ipp, Andreas
name: Müller, David I.
name: Wenger, Urs
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Machine Learning (cs.LG)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Machine Learning (stat.ML)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Fixed point lattice actions are designed to have continuum classical properties unaffected by discretization effects and reduced lattice artifacts at the quantum level. They provide a possible way to extract continuum physics with coarser lattices, thereby allowing one to circumvent problems with critical slowing down and topological freezing toward the continuum limit. A crucial ingredient for practical applications is to find an accurate and compact parametrization of a fixed point action, since many of its properties are only implicitly defined. Here we use machine learning methods to revisit the question of how to parametrize fixed point actions. In particular, we obtain a fixed point action for four-dimensional SU(3) gauge theory using convolutional neural networks with exact gauge invariance. The large operator space allows us to find superior parametrizations compared to previous studies, a necessary first step for future Monte Carlo simulations and scaling studies.
description: 22 pages, 15 figures, 6 tables; updated to published version
Interactive influence of apolipoprotein e genotype and dietary cholesterol on cholesterol synthesis in humans
Creators: name: Main, Blair F.
Publisher: name: University of British Columbia
Year: 2008

description: Apolipoprotein (apo) E is a 299 amino acid polypeptide that mediates the uptake of apo E containing lipoproteins by receptor-mediated endocytosis. Allelic differences at the apo E gene locus are responsible for as much as 8% of the variance of low density lipoprotein (LDL) cholesterol. Due to the association between LDL cholesterol levels and atherosclerosis, it has been suggested that apo E polymorphism may play a role in determining the risk of coronary artery disease. A method for apo E genotyping was developed using the polymerase chain reaction (PCR) with allele-specific oligonucleotide primers. The fourteen phenotypes identified by isoelectric focusing methods were consistent with the fourteen genotypes identified by the PCR method. Seven E2/- and six E4/- volunteers were selected for a dietary study investigating the interactive effects of apo E polymorphism and dietary cholesterol levels on cholesterol synthesis rates. Volunteers underwent two dietary treatments consisting of a low cholesterol diet (250 mg/day) and a high cholesterol diet (800 mg/day). At the end of each diet period an oral dose of deuterium was given at 0.7 g/Kg body water to determine fractional synthetic rate (FSR) of cholesterol. The apo E4/- group had a significantly higher serum total cholesterol level than the E2/- group throughout both dietary treatments. Cholesterol FSR was not significantly different between apo E groups when comparing dietary cholesterol levels. The apo E4/- did respond to fasting state differently from the E2/- group by not depressing cholesterol synthesis while on a low cholesterol diet. This suggests E4/- individuals may not have a sensitive endogenous feedback mechanism to suppress cholesterol synthesis while on a low cholesterol diet.
A note on elliptic coordinates on the Lie algebra e(3)
Creators: name: Tsiganov, A. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We introduce elliptic coordinates on the dual space to the Lie algebra e(3$ and discuss the separability of the Clebsch system in these variables. The proposed Darboux coordinates on e^*(3) coincide with the usual elliptic coordinates on the cotangent bundle of the two-dimensional sphere at the zero value of the corresponding Casimir function.
description: 4 pages, LaTeX and AmsTex. Accepted to J.Phys.A
title: Dante nell'era di internet
title: Genesi inconsapevole di un ipermedia letterario e breve storia dei successivi sviluppi glottodidattici
titleType: Subtitle
Creators: name: Di Dio, Luca
Publisher: name: Edizioni Ca' Foscari - Digital Publishing
Year: 2012

description: This essay examines the origin of a literary hypermedia which centres on the Divine Comedy, highlighting the motivational value and the coherence in terms of language teaching of the use of effective methodologies tailored to the cognitive capacities of the new generation. Thus teaching is no longer simply transmission of information, but becomes a process involv- ing conscious emotional collaboration on the part of the student in order to build his or her own knowledge.
description: EL.LE, 1 | 2 | 2012
Cavity Approach to the Spectral Density of Sparse Symmetric Random Matrices
Creators: name: Rogers, Tim
name: Takeda, Koujin
name: Castillo, Isaac Pérez
name: Kühn, Reimer
Publisher: name: arXiv
Year: 2008
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The spectral density of various ensembles of sparse symmetric random matrices is analyzed using the cavity method. We consider two cases: matrices whose associated graphs are locally tree-like, and sparse covariance matrices. We derive a closed set of equations from which the density of eigenvalues can be efficiently calculated. Within this approach, the Wigner semicircle law for Gaussian matrices and the Marcenko-Pastur law for covariance matrices are recovered easily. Our results are compared with numerical diagonalization, finding excellent agreement.
description: 7 pages, 6 figures
Faster One Block Quantifier Elimination for Regular Polynomial Systems of Equations
Creators: name: Le, Huu Phuoc
name: Din, Mohab Safey El
Publisher: name: arXiv
Year: 2021
Subjects: subject: Symbolic Computation (cs.SC)
subject: Computational Geometry (cs.CG)
subject: FOS: Computer and information sciences
subject: I.1.2

description: Quantifier elimination over the reals is a central problem in computational real algebraic geometry, polynomial system solving and symbolic computation. Given a semi-algebraic formula (whose atoms are polynomial constraints) with quantifiers on some variables, it consists in computing a logically equivalent formula involving only unquantified variables. When there is no alternation of quantifiers, one has a one block quantifier elimination problem. This paper studies a variant of the one block quantifier elimination in which we compute an almost equivalent formula of the input. We design a new probabilistic efficient algorithm for solving this variant when the input is a system of polynomial equations satisfying some regularity assumptions. When the input is generic, involves $s$ polynomials of degree bounded by $D$ with $n$ quantified variables and $t$ unquantified ones, we prove that this algorithm outputs semi-algebraic formulas of degree bounded by $\mathcal{D}$ using $O\ {\widetilde{~}}\left ((n-s+1)\ 8^{t}\ \mathcal{D}^{3t+2} \binom{t+\mathcal{D}}{t} \right )$ arithmetic operations in the ground field where $\mathcal{D} = 2(n+s)\ D^s(D-1)^{n-s+1}\ \binom{n}{s}$. In practice, it allows us to solve quantifier elimination problems which are out of reach of the state-of-the-art (up to $8$ variables).
description: International Symposium on Symbolic and Algebraic Computation 2021, Jul. 2021, Saint-Petersbourg, Russia
Color Intensity Projections: A simple way to display changes in astronomical images
Creators: name: Cover, Keith S
name: Lagerwaard, Frank J
name: Senan, Suresh
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: To detect changes in repeated astronomical images of the same field of view (FOV), a common practice is to stroboscopically switch between the images. Using this method, objects that are changing in location or intensity between images are easier to see because they are constantly changing. A novel display method, called arrival time color intensity projections (CIPs), is presented that combines any number of grayscale images into a single color image on a pixel by pixel basis. Any values that are unchanged over the grayscale images look the same in the color image. However, pixels that change over the grayscale image have a color saturation that increases with the amount of change and a hue that corresponds to the timing of the changes. Thus objects moving in the grayscale images change from red to green to blue as they move across the color image. Consequently, moving objects are easier to detect and assess on the color image than on the grayscale images. A sequence of images of a comet plunging into the sun taken by the SOHO satellite (NASA/ESA) and Hubble Space Telescope images of a trans-Neptunian object (TNO) are used to demonstrate the method.
description: 9 pages, 2 figures. Accepted for publication in Publications of the Astronomical Society of the Pacific. The quality of figure 1 been improved from the previous posted version
Carcere e formazione
Creators: name: Carmignani, Serena
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2012

description:

The essay reports the results of a study concerning the projects carried out in Italy since 2001 by different types of organizations working in the field of language education in the framework of prisoners’ professional training; in particular, the problem of migrant prisoners has been highlighted.

description: EL.LE
Rete AIM: una rete per la promozione e la diffusione della lingua e della cultura italiane nel mondo
Creators: name: Mazzocato, Greta
name: Menegaldo, Maria Grazia
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2012

description:

This article talks about Rete AIM’s role, aims and actions. Rete AIM’s purpose is to gather associations of Italianists and Schools of Italian all over the world in order to promote Italian language and culture in the world and improve the quality of language teaching. Its reg- istered office is at Laboratorio itals, in the Centro di Didattica delle Lingue del Dipartimento di Studi Linguistici e Culturali Comparati, at the Ca’ Foscari University of Venice.

description: EL.LE
Estimation of the electric field in atom probe tomography experiments using charge state ratios
Creators: name: Tegg, Levi
name: Stephenson, Leigh T.
name: Cairney, Julie M.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: (Kingham 1982) provided equations for the probability of observing higher charge states in atom probe tomography (APT) experiments. These "Kingham curves" have wide application in APT, but cannot be analytically transformed to provide the electric field in terms of the easily-measured charge state ratio (CSR). Here we provide a numerical scheme for the calculation of Kingham curves and the variation in electric field with CSR. We find the variation in electric field with CSR is well-described by a simple two or three-parameter equation, and the model is accurate to most elements and charge states. The model is applied to experimental APT data of pure aluminium and a microalloyed steel, demonstrating that the methods described in this work can be easily applied to a variety of APT problems to understand electric field variations.
Controlled synthesis and characterization of porous silicon nanoparticles for dynamic nuclear polarization
Creators: name: von Witte, Gevin
name: Himmler, Aaron
name: Hyppönen, Viivi
name: Jäntti, Jiri
name: Albannay, Mohammed M.
name: Moilanen, Jani O.
name: Ernst, Matthias
name: Lehto, Vesa-Pekka
name: Riikonen, Joakim
name: Kozerke, Sebastian
name: Kettunen, Mikko I.
name: Tamarov, Konstantin
Publisher: name: arXiv
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Si nanoparticles (NPs) have been actively developed as a hyperpolarized magnetic resonance imaging (MRI) contrast agent with an imaging window close to one hour. However, the progress in the development of NPs has been hampered by the incomplete understanding of their structural properties that correspond to efficient hyperpolarization buildup and long polarization decays. In this work we study dynamic nuclear polarization (DNP) of single crystal porous Si (PSi) NPs with defined doping densities ranging from nominally undoped to highly doped with boron or phosphorus. To develop such PSi NPs we perform low-load metal-assisted catalytic etching for electronic grade Si powder followed by thermal oxidation to form the dangling bonds in the Si/SiO$_2$ interface, the $P_b$ centers. $P_b$ centers are the endogenous source of the unpaired electron spins necessary for DNP. The controlled fabrication and oxidation procedures allow us to thoroughly investigate the impact of the magnetic field, temperature and doping on the DNP process. We argue that the buildup and decay rate constants are independent of size of Si crystals between approximately 10 and 60 nm. Instead, the rates are limited by the polarization transfer across the nuclear spin diffusion barrier determined by the large hyperfine shift of the central $^{29}$Si nuclei of the $P_b$ centers. The size-independent rates are then weakly affected by the doping degree for low and moderately doped Si although slight doping is required to achieve the highest polarization. Thus, we find the room temperature relaxation of low boron doped PSi NPs reaching $75 \pm 3$ minutes and nuclear polarization levels exceeding $\sim 6$ % when polarized at 6.7 T and 1.4 K. Our study thus establishes solid grounds for further development of Si NPs as hyperpolarized contrast agents.
description: Main text: 47 pages, 6 figures. Supporting information: 26 pages, 25 figures. Main text and supporting information are combined into one PDF file. Nanoscale, Advance Article (2024)
Evolving controllers for simulated car racing
Creators: name: Togelius, Julian
name: Lucas, Simon M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Machine Learning (cs.LG)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: This paper describes the evolution of controllers for racing a simulated radio-controlled car around a track, modelled on a real physical track. Five different controller architectures were compared, based on neural networks, force fields and action sequences. The controllers use either egocentric (first person), Newtonian (third person) or no information about the state of the car (open-loop controller). The only controller that was able to evolve good racing behaviour was based on a neural network acting on egocentric inputs.
description: Won the CEC 2005 Best Student Paper Award
Phase transitions in isolated strongly interacting systems
Creators: name: Veselsky, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Thermodynamical properties of the nuclear matter at sub-saturation densities were investigated using a simple van der Waals-like equation of state with an additional term representing the symmetry energy. First-order isospin-asymmetric liquid-gas phase transition appears restricted to isolated isospin-asymmetric systems while the symmetric systems will undergo fragmentation decay resembling the second-order phase transition. The density dependence of the symmetry energy scaling with the Fermi energy satisfactorily describes the symmetry energy at sub-saturation nuclear densities. The deconfinement-confinement phase transition from the quark-gluon plasma to the confined quark matter appears in the isolated systems continuous in energy density while discontinuous in quark density. A transitional state of the confined quark matter has a negative pressure and after hadronization an explosion scenario can take place which can offer explanation for the HBT puzzle as a signature of the phase transition.
description: 18 pages, 8 figures, LaTeX, minor corrections
Topology of the Causal Boundary for Standard Static Spacetimes
Creators: name: Flores, Jose' L.
name: Harris, Steven G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The topology of the causal boundary for standard static spacetimes--spacetimes time-invariantly conformal to a metric product of the Lorentz line and a Riemannian manifold--is studied in depth. As this is given in terms of a set of real-valued functions on the Riemannian factor, one could use a function-space topology, but physical reasons recommend a chronological topology instead. The function-space topology has a simple product structure, while the chronological topology might not. This paper examines when the chronological topology coincides with the function-space topology and when it has a simple product structure. A class of standard static spacetimes is examined, all of which yield a simple product structure for the causal boundary; the conformal class of these spacetimes includes classical spacetimes such as external Schwarzschild or Reissner-Nordstrom.
description: 50 pages, AMS-TeX; submitted to Class. Quantum Grav
Moving beyond the transmon: Noise-protected superconducting quantum circuits
Creators: name: Gyenis, András
name: Di Paolo, Agustin
name: Koch, Jens
name: Blais, Alexandre
name: Houck, Andrew A.
name: Schuster, David I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Artificial atoms realized by superconducting circuits offer unique opportunities to store and process quantum information with high fidelity. Among them, implementations of circuits that harness intrinsic noise protection have been rapidly developed in recent years. These noise-protected devices constitute a new class of qubits in which the computational states are largely decoupled from local noise channels. The main challenges in engineering such systems are simultaneously guarding against both bit- and phase-flip errors, and also ensuring high-fidelity qubit control. Although partial noise protection is possible in superconducting circuits relying on a single quantum degree of freedom, the promise of complete protection can only be fulfilled by implementing multimode or hybrid circuits. This Perspective reviews the theoretical principles at the heart of these new qubits, describes recent experiments, and highlights the potential of robust encoding of quantum information in superconducting qubits.
Growth of products of subsets in finite simple groups
Creators: name: Dona, Daniele
name: Maróti, Attila
name: Pyber, László
Publisher: name: arXiv
Year: 2024
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20D06, 20F69

description: We prove that the product of a subset and a normal subset inside any finite simple non-abelian group $G$ grows rapidly. More precisely, if $A$ and $B$ are two subsets with $B$ normal and neither of them is too large inside $G$, then $|AB| \geq |A||B|^{1-ε}$ where $ε>0$ can be taken arbitrarily small. This is a somewhat surprising strengthening of a theorem of Liebeck, Schul, Shalev.
description: 7 pages
An ontology for the DMP Common Standard Model
Creators: name: Cardoso, João
name: Borbinha, José
Publisher: name: F1000 Research Limited
Year: 2019

description: Data Management Plans (DMP) are documents that describe the techniques, methods and policies on how data is to be created, documented, accessed, preserved and disseminated throughout a project’s life cycle.

Most funding agencies now require that researchers submit a DMP with grant applications. Unfortunately the resulting DMP documents display a series of issues. Such as: a varying level of detail according to the expertise and meticulousness of its creators, or a lack of consistency due to the non standardization of the existing templates.

The concept of Machine-Actionable DMP (maDMP), aims at solving some of these issues by making the DMP machine-readable without compromising its human-readability. The adoption of an open, shared and interoperable concept of maDMP could bring multiple benefits, such as to data discovery and reuse, evaluation and monitoring, etc.

The DMP Common Standard, an information model that was developed by a Research Data Alliance (RDA) workgroup. This model presents a minimum set of universal terms that ensure basic interoperability of systems using maDMPs.

The ontology that we present is a representation of the DMP Common Standard model, and as such a materialization of the maDMP concept. Our objective is to promote the creation of representations of individual DMP documents through the usage of our ontology. Our expectation is that we can then process these representations and develop services for creating, sharing, reuse and process of maDMP, and also extract non explicit information from them, thus increasing their value.
La diffusione della lingua e cultura italiana in Mozambico: 2008- 2012
Creators: name: Rizza, Anna
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2012

description:

Africa is today one of the ‘emergent markets’ for Italian as a foreign language. In Africa, Mozambique holds a relevant position as far as Italian as a foreign language is concerned, as a consequence of the role that Italy has played in the appeasement process at the turn of the century. The essay starts with a brief section dealing with the language repertoire of Mozambique and with the history of its relations with Italy, and then explores the situation of Italian as a foreign language in universities, schools and other agencies. Some trends are discussed as a conclusion.

description: EL.LE
Generalized Free Cumulants for Quantum Chaotic Systems
Creators: name: Jindal, Siddharth
name: Hosur, Pavan
Publisher: name: arXiv
Year: 2024
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The eigenstate thermalization hypothesis (ETH) is the leading conjecture for the emergence of statistical mechanics in generic isolated quantum systems and is formulated in terms of the matrix elements of operators. An analog known as the ergodic bipartition (EB) describes entanglement and locality and is formulated in terms of the components of eigenstates. In this paper, we significantly generalize the EB and unify it with the ETH, extending the EB to study higher correlations and systems out of equilibrium. Our main result is a diagrammatic formalism that computes arbitrary correlations between eigenstates and operators based on a recently uncovered connection between the ETH and free probability theory. We refer to the connected components of our diagrams as generalized free cumulants. We apply our formalism in several ways. First, we focus on chaotic eigenstates and establish the so-called subsystem ETH and the Page curve as consequences of our construction. We also improve known calculations for thermal reduced density matrices and comment on an inherently free probabilistic aspect of the replica approach to entanglement entropy previously noticed in a calculation for the Page curve of an evaporating black hole. Next, we turn to chaotic quantum dynamics and demonstrate the ETH as a sufficient mechanism for thermalization, in general. In particular, we show that reduced density matrices relax to their equilibrium form and that systems obey the Page curve at late times. We also demonstrate that the different phases of entanglement growth are encoded in higher correlations of the EB. Lastly, we examine the chaotic structure of eigenstates and operators together and reveal previously overlooked correlations between them. Crucially, these correlations encode butterfly velocities, a well-known dynamical property of interacting quantum systems.
description: 46+17 pages, 20 figures. (v2) Overhauled appendix C.2; various clarifications and corrections; added references (v3) New results in 5.3; corrections and clarifications
Glottodidattica giovane 2011. Saggi di 20 giovani studiosi italiani, 2011, Perugia, Guerra
Creators: name: Balboni, Paolo
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2012

description:

description: EL.LE
Optical Quantum Computing
Creators: name: O'Brien, Jeremy L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In 2001 all-optical quantum computing became feasible with the discovery that scalable quantum computing is possible using only single photon sources, linear optical elements, and single photon detectors. Although it was in principle scalable, the massive resource overhead made the scheme practically daunting. However, several simplifications were followed by proof-of-principle demonstrations, and recent approaches based on cluster states or error encoding have dramatically reduced this worrying resource overhead, making an all-optical architecture a serious contender for the ultimate goal of a large-scale quantum computer. Key challenges will be the realization of high-efficiency sources of indistinguishable single photons, low-loss, scalable optical circuits, high efficiency single photon detectors, and low-loss interfacing of these components.
description: 5 pages, 4 figures
Data on static location/Datos sobre locación estática
Creators: name: Vásquez Leví, Gregorio
name: Vallejos Yopán, Rosa
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: sey

description: Responses to Ameka, Felix K., Carliene de Witte & David Wilkins. 1999. Picture Series for Positional Verbs: Eliciting the Verbal Component in Locative Descriptions. In Wilkins, David (ed.), Manual for the 1999 Field Season, pp. 48-54. Nijmegen: Max Planck Institute for Psycholinguistics. doi:10.17617/2.2573831. The recordings have been transcribed and translated into Spanish and English using Praat.
Beyond principlism: Practical strategies for ethical AI use in research practices
Creators: name: Lin, Zhicheng
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computers and Society (cs.CY)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The rapid adoption of generative artificial intelligence (AI) in scientific research, particularly large language models (LLMs), has outpaced the development of ethical guidelines, leading to a Triple-Too problem: too many high-level ethical initiatives, too abstract principles lacking contextual and practical relevance, and too much focus on restrictions and risks over benefits and utilities. Existing approaches, including principlism (reliance on abstract ethical principles), formalism (rigid application of rules), and technical solutionism (overemphasis on technological fixes), offer little practical guidance for addressing ethical challenges of AI in scientific research practices. To bridge the gap between abstract principles and day-to-day research practices, a user-centered, realism-inspired approach is proposed here. It outlines five specific goals for ethical AI use: 1) understanding model training and output, including bias mitigation strategies; 2) respecting privacy, confidentiality, and copyright; 3) avoiding plagiarism and policy violations; 4) applying AI beneficially compared to alternatives; and 5) using AI transparently and reproducibly. Each goal is accompanied by actionable strategies and realistic cases of misuse and corrective measures. I argue that ethical AI application requires evaluating its utility against existing alternatives rather than isolated performance metrics. Additionally, I propose documentation guidelines to enhance transparency and reproducibility in AI-assisted research. Moving forward, we need targeted professional development, training programs, and balanced enforcement mechanisms to promote responsible AI use while fostering innovation. By refining these ethical guidelines and adapting them to emerging AI capabilities, we can accelerate scientific progress without compromising research integrity.
description: Accepted in: AI and Ethics. 20 pages, 1 figure, 3 tables, 2 boxes
Molecular line signatures of cloud-cloud collisions
Creators: name: Priestley, F. D.
name: Whitworth, A. P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Collisions between interstellar gas clouds are potentially an important mechanism for triggering star formation. This is because they are able to rapidly generate large masses of dense gas. Observationally, cloud collisions are often identified in position-velocity (PV) space through bridging features between intensity peaks, usually of CO emission. Using a combination of hydrodynamical simulations, time-dependent chemistry, and radiative transfer, we produce synthetic molecular line observations of overlapping clouds that are genuinely colliding, and overlapping clouds that are just chance superpositions. Molecules tracing denser material than CO, such as NH$_3$ and HCN, reach peak intensity ratios of $0.5$ and $0.2$ with respect to CO in the `bridging feature' region of PV space for genuinely colliding clouds. For overlapping clouds that are just chance superpositions, the peak NH$_3$ and HCN intensities are co-located with the CO intensity peaks. This represents a way of confirming cloud collisions observationally, and distinguishing them from chance alignments of unrelated material.
description: 7 pages, 4 figures, MNRAS accepted
The relation of unsupportive actions by the spouse to marital satisfaction
Creators: name: Habke, A. Marie
Publisher: name: University of British Columbia
Year: 2008

description: Despite the demonstrated benefits of social relationships, there is a growing recognition that such relationships also contain a significant proportion of negative interactions. Even though research has shown that such negative interactions have detrimental effects on outcomes such as marital satisfaction, little is known about how these interactions come to be associated with outcomes. One hundred and three couples having at least one child from a previous relationship living with them completed a telephone interview. As predicted, the results suggest that higher levels of perceived spousal unhelpfulness was related to lower marital satisfaction. Although spousal criticism was not related to marital satisfaction as hypothesized, reports of a failure of the spouse to provide support was linked to low marital satisfaction for husbands. Contrary to predictions, characterological attributions were not related to marital satisfaction although the hypothesized relation between levels of blame in the attribution and marital satisfaction was supported. However, when controlling for demographics and the type and seriousness of the stressor, extent of blame predicted marital satisfaction only for wives. Wives who expressed more blame towards their spouse had lower DAS scores than did wives expressing less blame. No significant interactions between behavior and attribution were found.
RecNet: An Invertible Point Cloud Encoding through Range Image Embeddings for Multi-Robot Map Sharing and Reconstruction
Creators: name: Stathoulopoulos, Nikolaos
name: Saucedo, Mario A. V.
name: Koval, Anton
name: Nikolakopoulos, George
Publisher: name: arXiv
Year: 2024
Subjects: subject: Robotics (cs.RO)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In the field of resource-constrained robots and the need for effective place recognition in multi-robotic systems, this article introduces RecNet, a novel approach that concurrently addresses both challenges. The core of RecNet's methodology involves a transformative process: it projects 3D point clouds into range images, compresses them using an encoder-decoder framework, and subsequently reconstructs the range image, restoring the original point cloud. Additionally, RecNet utilizes the latent vector extracted from this process for efficient place recognition tasks. This approach not only achieves comparable place recognition results but also maintains a compact representation, suitable for sharing among robots to reconstruct their collective maps. The evaluation of RecNet encompasses an array of metrics, including place recognition performance, the structural similarity of the reconstructed point clouds, and the bandwidth transmission advantages, derived from sharing only the latent vectors. Our proposed approach is assessed using both a publicly available dataset and field experiments$^1$, confirming its efficacy and potential for real-world applications.
description: Accepted for publication in the 2024 IEEE International Conference on Robotics and Automation in Yokohama, (ICRA24)