cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dynamics of a helical swimmer crossing viscosity gradients
Creators: name: Lopez, Christian Esparza
name: Gonzalez-Gutierrez, Jorge
name: Solorio-Ordaz, Francisco
name: Lauga, Eric
name: Zenit, Roberto
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: We experimentally and theoretically study the dynamics of a low-Reynolds number helical swimmer moving across viscosity gradients. Experimentally, a double-layer viscosity is generated by superposing two miscible fluids with similar densities but different dynamic viscosities. A synthetic helical magnetically-driven swimmer is then made to move across the viscosity gradients along four different configurations: either head-first (pusher swimmer) or tail-first (puller), and through either positive (i.e. going from low to high viscosity) or negative viscosity gradients. We observe qualitative differences in the penetration dynamics for each case. We find that the swimming speed can either increase or decrease while swimming across the viscosity interface, which results from the fact that the head and the tail of the swimmer can be in environments in which the local viscosity leads to different relative amounts of drag and thrust. In order to rationalize the experimental measurements, we next develop a theoretical hydrodynamic model. We assume that the classical resistive-force theory of slender filaments is locally valid along the helical propeller and use it to calculate the swimming speed as a function of the position of the swimmer relative to the fluid-fluid interface. The predictions of the model agree well with experiments for the case of positive viscosity gradients. When crossing across a negative gradient, gravitational forces in the experiment become important, and we modify the model to include buoyancy, which agrees with experiments. In general our results show that it is harder for a pusher swimmer to cross from low to high viscosity, whereas for a puller swimmer it is the opposite. Our model is also extended to the case of a swimmer crossing a continuous viscosity gradient.
The ESO-Spitzer Imaging extragalactic Survey (ESIS) I: WFI B,V,R deep observations of ELAIS-S1 and comparison to Spitzer and GALEX data
Creators: name: Berta, S.
name: Rubele, S.
name: Franceschini, A.
name: Held, E. V.
name: Rizzi, L.
name: Lonsdale, C. J.
name: Jarrett, T. H.
name: Rodighiero, G.
name: Oliver, S. J.
name: Dias, J. E.
name: Buttery, H. J.
name: Fiore, F.
name: La Franca, F.
name: Puccetti, S.
name: Fang, F.
name: Shupe, D.
name: Surace, J.
name: Gruppioni, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The ESO-Spitzer extragalactic Imaging Survey (ESIS) is the optical follow up of the Spitzer Wide-Area InfraRed Extragalactic (SWIRE) survey in the ELAIS-S1 area. This paper presents B, V, R Wide Field Imager observations of the first 1.5 square degree of the ESIS survey. Data reduction is described including astrometric calibration, illumination and color corrections, completeness and photometric accuracy estimates. Number counts and color distributions are compared to literature observational and theoretical data, including non-evolutionary, PLE, evolutionary and semi-analytic Lambda-CDM galaxy models, as well as Milky Way stellar predictions. ESIS data are in good agreement with previous works and are best reproduced by evolutionary and hierarchical Lambda-CDM scenarios. The ELAIS-S1 area benefits from extensive follow-up from X-ray to radio frequencies: some potential uses of the multi-wavelength observations are illustrated. Optical-Spitzer color-color plots promise to be very powerful tools to disentangle different classes of sources (e.g. AGNs, starbursts, quiescent galaxies). Ultraviolet GALEX data are matched to optical and Spitzer samples, leading to a discussion of galaxy properties in the UV-to-24 microns color space. The spectral energy distribution of a few objects, from the X-rays to the far-IR are presented as examples of the multi-wavelength study of galaxy emission components in different spectral domains.
description: Accepted for publication in A&A. 24 pages, quality of some figures have been degraded
Reverse Climate Change in 40 Years! - (Presentation)
Creators: name: Dert, Vincent
Publisher: name: Zenodo
Year: 2024

description: This presentation gives a quick explanation of how the "Impact Measurement And Conservation System" (IMACS) works. The presentation has 20 slides.

Contact: sustainoneworld@gmail.com

Note: Zenodo version 9 (my version v9) was significantly improved after review by a selection of peers. DACCS sketch added. This new version has 24 slides.
Levy Flights, Non-local Search and Simulated Annealing
Creators: name: Pavlyukevich, I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Optimization and Control (math.OC)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We solve a problem of non-convex stochastic optimisation with help of simulated annealing of Levy flights of a variable stability index. The search of the ground state of an unknown potential is non-local due to big jumps of the Levy flights process. The convergence to the ground state is fast due to a polynomial decrease rate of the temperature.
A Survey on Future Railway Radio Communications Services: Challenges and Opportunities
Creators: name: Garcia-Loygorri, Juan Moreno
name: Riera, Jose Manuel
name: de Haro, Leandro
name: Rodriguez, Carlos
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Radio communications is one of the most disruptive technologies in railways, enabling a huge set of value-added services that greatly improve many aspects of railways, making them more efficient, safer, and profitable. Lately, some major technologies like ERTMS for high-speed railways and CBTC for subways have made possible a reduction of headway and increased safety never before seen in this field. The railway industry is now looking at wireless communications with great interest, and this can be seen in many projects around the world. Thus, railway radio communications is again a flourishing field, with a lot of research and many things to be done. This survey article explains both opportunities and challenges to be addressed by the railway sector in order to obtain all the possible benefits of the latest radio technologies.
Mass and charge transport in micro and nano-fluidic channels
Creators: name: Mortensen, N. A.
name: Olesen, L. H.
name: Okkels, F.
name: Bruus, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We consider laminar flow of incompressible electrolytes in long, straight channels driven by pressure and electro-osmosis. We use a Hilbert space eigenfunction expansion to address the general problem of an arbitrary cross section and obtain general results in linear-response theory for the mass and charge transport coefficients which satisfy Onsager relations. In the limit of non-overlapping Debye layers the transport coefficients are simply expressed in terms of parameters of the electrolyte as well as the hydraulic radius R=2A/P with A and P being the cross-sectional area and perimeter, respectively. In articular, we consider the limits of thin non-overlapping as well as strongly overlapping Debye layers, respectively, and calculate the corrections to the hydraulic resistance due to electro-hydrodynamic interactions.
description: Invited paper presented at the Second International Conference on Transport Phenomena in Micro and Nanodevices, Il Ciocco Hotel and Conference Center, Barga, Italy, 11-15 June 2006. Accepted for publication in a special issue of Nanoscale and Microscale Thermophysical Engineering (Taylor & Francis)
The Wireless Train Communication Network: Roll2Rail vision
Creators: name: García-Loygorri, Juan Moreno
name: Goikoetxea, Javier
name: Echeverría, Eneko
name: Arriola, Aitor
name: Val, Iñaki
name: Sand, Stephan
name: Unterhuber, Paul
name: del Río, Francisco
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: This paper explains the main results obtained from the research carried out in the work package 2 (WP2) of the Roll2Rail (R2R) project. This project aims to develop key technologies and to remove already identified blocking points for radical innovation in the field of railway vehicles, to increase their operational reliability and to reduce life-cycle costs. This project started in May 2015 and has been funded by the Horizon 2020 program of the European Commission. The goal for WP2 is to research on both technologies and architectures to develop a new wireless Train Communication Network (TCN) within IEC61375 standard series. This TCN is today entirely wired and is used for Train Control and Monitoring System (TCMS) functions (some of them safetyrelated), operator-oriented services and customer-oriented services. This paradigm shift from wired to wireless means a removal of wirings implies, among other benefits, a significant reduction of life cycle costs due to the removal of cables, and the simplification of the train coupling procedure, among others.
Reverse Climate Change in 40 Years! - (Presentation)
Creators: name: Dert, Vincent
Publisher: name: Zenodo
Year: 2024

description: This presentation gives a quick explanation of how the "Impact Measurement And Conservation System" (IMACS) works. The presentation has 20 slides.

Contact: www.sustainoneworld@gmail.com

Note: Zenodo version 6 (my version v5) was significantly improved with respect to word choice and style!
Does management control for sustainable development support TSEs funding? Some insights from the Italian context
Creators: name: Cavicchi, Caterina
name: Vagnoni, Emidia
Publisher: name: Economia Aziendale Online -
Year: 2023
Subjects: management control, third sector entities, sustainable development, funding, donors

description: Literature has called to investigate sustainability management control and reporting in third sector entities (TSEs), and how these latter can provide support to attract funds to these organizations for survival and growth. To address these gaps, a questionnaire survey has been administered to a sample of 4000 TSEs to investigate to what extent they are using planning and control systems to measure and report sustainable development (SD) information to attract funds, in front of major donors’ sensitivity around SD. As from the results, the adoption of sustainability initiatives in TSEs is weakly impacted by the donors’ sensitivity around SD; nevertheless, in TSEs adopting SD initiatives, the increase in the use of integrated management accounting, combining both financial and sustainability information is highly correlated to SD sensitivity of donors. The paper adds to the literature of sustainability reporting of TSEs and contribute to practice, underlying the main criticalities TSEs in using planning and control systems to support funding activities, especially in the light of SD sensitive donors.
description: Economia Aziendale Online -, Vol 14, No 4 (2023): ISSUE 4/2023
A photonic bandgap resonator to facilitate GHz frequency conductivity experiments in pulsed magnetic fields
Creators: name: McDonald, R. D.
name: Singleton, J.
name: Goddard, P. A.
name: Harrison, N.
name: Mielke, C. H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We describe instrumentation designed to perform millimeter-wave conductivity measurements in pulsed high magnetic fields at low temperatures. The main component of this system is an entirely non-metallic microwave resonator. The resonator utilizes periodic dielectric arrays (photonic bandgap structures) to confine the radiation, such that the resonant modes have a high Q-factor, and the system possesses sufficient sensitivity to measure small samples within the duration of a magnet pulse. As well as measuring the sample conductivity to probe orbital physics in metallic systems, this technique can detect the sample permittivity and permeability allowing measurement of spin physics in insulating systems. We demonstrate the system performance in pulsed magnetic fields with both electron paramagnetic resonance experiments and conductivity measurements of correlated electron systems.
description: Submitted to the Review of Scientific instruments
Fractons from frustration in hole-doped antiferromagnets
Creators: name: Sous, John
name: Pretko, Michael
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recent theoretical research on tensor gauge theories led to the discovery of an exotic type of quasiparticles, dubbed fractons, that obey both charge and dipole conservation. Here we describe physical implementation of dipole conservation laws in realistic systems. We show that fractons find a natural realization in hole-doped antiferromagnets. There, individual holes are largely immobile, while dipolar hole pairs move with ease. First, we demonstrate a broad parametric regime of fracton behavior in hole-doped two-dimensional Ising antiferromagnets viable through five orders in perturbation theory. We then specialize to the case of holes confined to one dimension in an otherwise two-dimensional antiferromagnetic background, which can be realized via the application of external fields in experiments, and prove ideal fracton behavior. We explicitly map the model onto a fracton Hamiltonian featuring conservation of dipole moment. Manifestations of fractonicity in these systems include gravitational clustering of holes. We also discuss diagnostics of fracton behavior, which we argue is borne out in existing experimental results.
description: 5 pages main text + 1 page supplementary information, 2 figures main text
Recording of a conversation between adults
Creators: name: Skilton, Amalia Horan
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2024
Subjects: subject: tca

description: Recording of a conversation between two sisters, Beronica and Laura, in Beronica's home. Another sister also appears briefly, as well as Beronica's 7-year-old son. The researcher is present at the beginning, then leaves.

Transcriptions of files in this bundle appear in Bundle 2018-19.190.
It contains a transcription of the following files, which are synchronized and represent different tracks on a recording of the same event:
tca_20220719_conv_lsc-vsc_audio_lsc.WAV, tca_20220719_conv_lsc-vsc_audio_vsc.WAV, tca_20220719_conv_lsc-vsc_video_xa30_archive.MP4, tca_20220719_conv_lsc-vsc_video_pjr_archive.MP4.
Selective Deletion in a Blockchain
Creators: name: Hillmann, Peter
name: Knüpfer, Marcus
name: Heiland, Erik
name: Karcher, Andreas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Computers and Society (cs.CY)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The constantly growing size of blockchains becomes a challenge with the increasing usage. Especially the storage of unwanted data in a blockchain is an issue, because it cannot be removed naturally. In order to counteract this problem, we present the first concept for the selective deletion of single entries in a blockchain. For this purpose, the general consensus algorithm is extended by the functionality of regularly creating summary blocks. Previous data of the chain are summarized and stored again in a new block, leaving out unwanted information. With a shifting marker of the Genesis Block, data can be deleted from the beginning of a blockchain. In this way, the technology of the blockchain becomes fully transactional. The concept is independent of a specific block structure, network structure, or consensus algorithm. Moreover, this functionality can be adapted to current blockchains to solve multiple problems related to scalability. This approach enables the transfer of blockchain technology to further fields of application, among others in the area of Industry 4.0 and Product Life-cycle Management.
Selective Reflection Spectroscopy on the UV Third Resonance Line of Cs : Simultaneous Probing of a van der Waals Atom-Surface Interaction Sensitive to Far IR Couplings and of Interatomic Collisions
Creators: name: Segundo, Pedro Chaves De Souza
name: Hamdi, Ismahène
name: Fichet, Michèle
name: Bloch, Daniel
name: Ducloy, Martial
Publisher: name: arXiv
Year: 2007
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We report on the analysis of FM selective reflection experiments on the 6S1/2->8P3/2 transition of Cs at 388 nm, and on the measurement of the surface van der Waals interaction exerted by a sapphire interface on Cs(8P3/2). Various improvements in the systematic fitting of the experiments have permitted to supersede the major difficulty of a severe overlap of the hyperfine components, originating on the one hand in a relatively small natural structure, and on the other hand on a large pressure broadening imposed by the high atomic density needed for the observation of selective reflection on a weak transition. The strength of the van der Waals surface interaction is evaluated to be 73$\pm$10 kHz.$μ$m3. An evaluation of the pressure shift of the transition is also provided as a by-product of the measurement. We finally discuss the significance of an apparent disagreement between the experimental measurement of the surface interaction, and the theoretical value calculated for an electromagnetic vacuum at a null temperature. The possible influence of the thermal excitation of the surface is evoked, because, the dominant contributions to the vW interaction for Cs(8P3/2) lie in the far infrared range.
description: submitted to Laser Physics - issue in the memory of Herbert Walther-
Cultural heritage and the acquisition of private archives
Creators: name: Karlebach, Tanya
Publisher: name: University of British Columbia
Year: 2009

description: This thesis provides an examination of a number of issues relating to private archives within the context of their acquisition. The investigation begins with an historical inquiry into the creation, use and acquisition of private archives in western society. The study then expands to examine issues concerning heritage and culture in twentieth century society with particular note of Canadian society. These larger cultural issues are then investigated specifically as they pertain to private archives and archival institutions. These investigations reveal the significance of communities in the formation and fostering of cultural identity, and the need to acknowledge this in archival practice. The thesis argues that when examining the provenance of private archives, the larger community within which the records were created is of crucial importance. The investigation determines that the community provides a cultural framework which influences its members and which in turn is reflected in the archives. That the symbolic significance and cultural relevance of these archives to other members of the community is enormous is a central argument of the thesis and leads to the conclusion that the removal of these archives from the community of creation results in a form of cultural appropriation. The thesis concludes by positing certain principles designed to facilitate private archives acquisition that aims to maintain the cultural integrity of specific communities.
Constructions in Sasakian Geometry
Creators: name: Boyer, Charles P.
name: Galicki, Krzysztof
name: Ornea, Liviu
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 53C25

description: We describe various constructions in Sasakian geometry. First we generalize the join construction of the first two authors to arbitrary Sasakian manifolds. We then give several examples, including ones which prove the existence of Sasakian-Einstein metrics on manifolds homeomorphic to $S^2\times S^5.$ Then we use a generalization of the join construction due to Lerman, namely contact fibre bundles, to give a theorem constructing toric Sasakian structures. Finally, we explicitly construct regular toric Sasakian structures on all simply connected regular contact manifolds in dimension five.
description: Some minor errors corrected. References updated. To appear in Mathematische Zeitschrift
Stellar velocity dispersion and initial mass function gradients in dissipationless galaxy mergers
Creators: name: Nipoti, Carlo
name: Cannarozzo, Carlo
name: Calura, Francesco
name: Sonnenfeld, Alessandro
name: Treu, Tommaso
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: J.2
subject: 85A05

description: The stellar initial mass function (IMF) is believed to be non-universal among early-type galaxies (ETGs). Parameterizing the IMF with the so-called IMF mismatch parameter $α_{\rm IMF}$, which is a measure of the stellar mass-to-light ratio of an ensemble of stars and thus of the 'heaviness' of its IMF, one finds that for ETGs $α_{\rm e}$ (i.e. $α_{\rm IMF}$ integrated within the effective radius $R_{\rm e}$) increases with $σ_{\rm e}$ (the line-of-sight velocity dispersion $σ_{\rm los}$ integrated within $R_{\rm e}$) and that, within the same ETG, $α_{\rm IMF}$ tends to decrease outwards. We study the effect of dissipationless (dry) mergers on the distribution of the IMF mismatch parameter $α_{\rm IMF}$ in ETGs using the results of binary major and minor merging simulations. We find that dry mergers tend to make the $α_{\rm IMF}$ profiles of ETGs shallower, but do not alter significantly the shape of the distributions in the spatially resolved $σ_{\rm los}α_{\rm IMF}$ space. Individual galaxies undergoing dry mergers tend to decrease their $α_{\rm e}$, due to erosion of $α_{\rm IMF}$ gradients and mixing with stellar populations with lighter IMF. Their $σ_{\rm e}$ can either decrease or increase, depending on the merging orbital parameters and mass ratio, but tends to decrease for cosmologically motivated merging histories. The $α_{\rm e}$-$σ_{\rm e}$ relation can vary with redshift as a consequence of the evolution of individual ETGs: based on a simple dry-merging model, ETGs of given $σ_{\rm e}$ are expected to have higher $α_{\rm e}$ at higher redshift, unless the accreted satellites are so diffuse that they contribute negligibly to the inner stellar distribution of the merger remnant.
description: 15 pages, 13 figures, accepted for publication in MNRAS
Can a light ray distinguish charge of a black hole in nonlinear electrodynamics?
Creators: name: Toshmatov, Bobir
name: Ahmedov, Bobomurat
name: Malafarina, Daniele
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It is a well-known fact that light rays do not follow the null geodesics of the space-time in nonlinear electrodynamics; instead, they follow the null geodesics of the so-called effective space-time. Taking this into account, in this paper, we aim to discuss the possibility of distinguishing the type of charge with which the black hole is endowed, via the motion of light rays. The results show that, for any black hole being a charged solution of the field equations of general relativity coupled to the nonlinear electrodynamics, one cannot distinguish the two types of charge (magnetic or electric) through the motion of light rays around it.
description: 6 pages
The relaxation time of a chiral quantum R-L circuit
Creators: name: Gabelli, Julien
name: Fève, Gwendal
name: Kontos, Takis
name: Berroir, Jean-Marc
name: Plaçais, Bernard
name: Glattli, Christian
name: Etienne, Bernard
name: Jin, Yong
name: Büttiker, Markus
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report on the GHz complex admittance of a chiral one dimensional ballistic conductor formed by edge states in the quantum Hall regime. The circuit consists of a wide Hall bar (the inductor L) in series with a tunable resistor (R) formed by a quantum point contact. Electron interactions between edges are screened by a pair of side gates. Conductance steps are observed on both real and imaginary parts of the admittance. Remarkably, the phase of the admittance is transmission-independent. This shows that the relaxation time of a chiral R-L circuit is resistance independent. A current and charge conserving scattering theory is presented that accounts for this observation with a relaxation time given by the electronic transit time in the c cuit.
Bridging-induced microphase separation: photobleaching experiments, chromatin domains, and the need for active reactions
Creators: name: Brackley, Chris A.
name: Marenduzzo, Davide
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We review the mechanism and consequences of the "bridging-induced attraction", a generic biophysical principle which underpins some existing models for chromosome organisation in 3-D. This attraction, which was revealed in polymer physics-inspired computer simulations, is a generic clustering tendency arising in multivalent chromatin-binding proteins, and it provides an explanation for the biogenesis of nuclear bodies and transcription factories via microphase separation. Including post-translational modification reactions involving these multivalent proteins can account for the fast dynamics of the ensuing clusters, as is observed via microscopy and photobleaching experiments. The clusters found in simulations also give rise to chromatin domains which conform well with the observation of A/B compartments in HiC experiments.
description: 7 pages, 3 figures
Magnetism and charge order in the honeycomb lattice
Creators: name: Costa, Natanael C.
name: Seki, Kazuhiro
name: Sorella, Sandro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Despite being relevant to better understand the properties of honeycomb-like systems, as graphene-based compounds, the electron-phonon interaction is commonly disregarded in theoretical approaches. That is, the effects of phonon fields on \textit{interacting} Dirac electrons is an open issue, in particular when investigating long-range ordering. Thus, here we perform unbiased quantum Monte Carlo simulations to examine the Hubbard-Holstein model (HHM) in the half-filled honeycomb lattice. By performing careful finite-size scaling analysis, we identify semimetal-to-insulator quantum critical points, and determine the behavior of the antiferromagnetic and charge-density wave phase transitions. We have, therefore, established the ground state phase diagram of the HHM for intermediate interaction strength, determining its behavior for different phonon frequencies. Our findings represent a complete description of the model, and may shed light on the emergence of many-body properties in honeycomb-like systems.
description: 5 pages, 5 figures + Supplementary Material
Failure of microcausality in noncommutative field theories
Creators: name: Soloviev, Michael A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We revisit the question of microcausality violations in quantum field theory on noncommutative spacetime, taking $O(x)=:ϕ\starϕ:(x)$ as a sample observable. Using methods of the theory of distributions, we precisely describe the support properties of the commutator [O(x),O(y)] and prove that, in the case of space-space noncommutativity, it does not vanish at spacelike separation in the noncommuting directions. However, the matrix elements of this commutator exhibit a rapid falloff along an arbitrary spacelike direction irrespective of the type of noncommutativity. We also consider the star commutator for this observable and show that it fails to vanish even at spacelike separation in the commuting directions and completely violates causality. We conclude with a brief discussion about the modified Wightman functions which are vacuum expectation values of the star products of fields at different spacetime points.
description: LaTeX, 22 pages; v2: minor updates to agree with published version, added reference
Noise Conscious Training of Non Local Neural Network powered by Self Attentive Spectral Normalized Markovian Patch GAN for Low Dose CT Denoising
Creators: name: Bera, Sutanu
name: Biswas, Prabir Kumar
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The explosive rise of the use of Computer tomography (CT) imaging in medical practice has heightened public concern over the patient's associated radiation dose. However, reducing the radiation dose leads to increased noise and artifacts, which adversely degrades the scan's interpretability. Consequently, an advanced image reconstruction algorithm to improve the diagnostic performance of low dose ct arose as the primary concern among the researchers, which is challenging due to the ill-posedness of the problem. In recent times, the deep learning-based technique has emerged as a dominant method for low dose CT(LDCT) denoising. However, some common bottleneck still exists, which hinders deep learning-based techniques from furnishing the best performance. In this study, we attempted to mitigate these problems with three novel accretions. First, we propose a novel convolutional module as the first attempt to utilize neighborhood similarity of CT images for denoising tasks. Our proposed module assisted in boosting the denoising by a significant margin. Next, we moved towards the problem of non-stationarity of CT noise and introduced a new noise aware mean square error loss for LDCT denoising. Moreover, the loss mentioned above also assisted to alleviate the laborious effort required while training CT denoising network using image patches. Lastly, we propose a novel discriminator function for CT denoising tasks. The conventional vanilla discriminator tends to overlook the fine structural details and focus on the global agreement. Our proposed discriminator leverage self-attention and pixel-wise GANs for restoring the diagnostic quality of LDCT images. Our method validated on a publicly available dataset of the 2016 NIH-AAPM-Mayo Clinic Low Dose CT Grand Challenge performed remarkably better than the existing state of the art method.
A Genuine Intermediate-Age Globular Cluster in M33
Creators: name: Chandar, Rupali
name: Puzia, Thomas H.
name: Sarajedini, Ata
name: Goudfrooij, Paul
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present deep integrated-light spectroscopy of nine M33 globular clusters taken with the Hectospec instrument at the MMT Observatory. Based on our spectroscopy and previous deep color-magnitude diagrams obtained with HST/WFPC2, we present evidence for the presence of a genuine intermediate-age globular cluster in M33. The analysis of Lick line indices indicates that all globular clusters are metal-poor ([Z/H]
description: 4 pages, 3 figures, accepted for publication in ApJ Letters
Recording of a conversation between adults
Creators: name: Candido Guerrero, Shavelly
name: Candido Guerrero, Yaneth
name: Guerrero Coello, Edith
name: Skilton, Amalia Horan
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2024
Subjects: subject: tca

description: Recording of a conversation between three coresident women in their home. They are a mother, Edith, and her two adult daughters, Shavelly and Yaneth. Several of the women's children and other household members also briefly appear. The researcher is present at the beginning, then leaves.
An Analytical Approach for Preliminary Response-Based Design of Semi Rigid Moment Resisting Frames
Creators: name: Charvade, Arash Shafegati
name: Sarayi, Seyyed Mostafa Mousavi Janbeh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In many cases, beam to column connections in structural frames are semi rigid, but they are considered to be ideally rigid or pinned due to their computational complexity and shortage of designing methods. In this paper, connections are considered as linear rotational springs with variable stiffness. Moreover, the main contribution of the present study is a preliminary design method of moment resisting frames, considering semi rigid behavior of connections, by means of presented diagrams for different frames. These diagrams relate three features of a frame together; stiffness of frames connections, geometrical properties of frames elements, and its lateral displacement. These diagrams can be used when the required stiffness of frames connections is needed while the desired response of the frame, dimensions of the frame and the ratio of second moment of inertia of its elements are known. On the other hand, they could be used to obtain the ratio of beams length to columns length and the ratio of second moment of inertia of beams to columns alongside the stiffness of frames connections while the only known data is the number of frames grids in X and Y directions and its desired response.
Quantum Dynamics with Bohmian Trajectories
Creators: name: Deckert, D. -A.
name: Duerr, D.
name: Pickl, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We describe the advantages and disadvantages of numerical methods when Bohmian trajectory-grids are used for numerical simulations of quantum dynamics. We focus on the crucial non crossing property of Bohmian trajectories, which numerically must be paid careful attention to. Failure to do so causes instabilities or leads to false simulations.
description: 17 pages, 18 figures; some typos corrected, 4 figures added, some paragraphs extended, source code extended
Regulation of notch sensitivity of lattice materials by strut topology
Creators: name: Li, K.
name: Seiler, P. E.
name: Deshpande, V. S.
name: Fleck, N. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We propose a local reinforcement technique for lattices in the vicinity of a stress-raiser such as a notch, in order to elevate the macroscopic strength and ductility. A spatially non-uniform waviness distribution of sinusoidally-shaped struts is assumed in the vicinity of the notch, and the sensitivity of macroscopic tensile response to strut waviness distribution is studied by finite element analysis. Optimized lattice structures are determined in order to maximise the macroscopic tensile strength or ductility from these various strut waviness distributions. Both hexagonal and triangular lattices are studied as these geometries are representative of bending-dominated and stretching-dominated lattices, respectively.
description: 33 pages, 16 figures
LkH$α$ 330: Evidence for dust clearing through resolved submillimeter imaging
Creators: name: Brown, J. M
name: Blake, G. A.
name: Qi, C.
name: Dullemond, C. P.
name: Wilner, D. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Mid-infrared spectrophotometric observations have revealed a small sub-class of circumstellar disks with spectral energy distributions (SEDs) suggestive of large inner gaps with low dust content. However, such data provide only an indirect and model dependent method of finding central holes. We present here the direct characterization of a 40 AU radius inner gap in the disk around LkHa 330 through 340 GHz (880 micron) dust continuum imaging with the Submillimeter Array (SMA). This large gap is fully resolved by the SMA observations and mostly empty of dust with less than 1.3 x 10^-6 M_solar of solid particles inside of 40 AU. Gas (as traced by accretion markers and CO M-band emission) is still present in the inner disk and the outer edge of the gap rises steeply -- features in better agreement with the underlying cause being gravitational perturbation than a more gradual process such as grain growth. Importantly, the good agreement of the spatially resolved data and spectrophometry-based model lends confidence to current interpretations of SEDs with significant dust emission deficits as arising from disks with inner gaps or holes. Further SED-based searches can therefore be expected to yield numerous additional candidates that can be examined at high spatial resolution.
description: 11 pages, 3 figures, accepted to ApJL
Zeno and anti-Zeno dynamics in spin-bath models
Creators: name: Segal, Dvira
name: Reichman, David R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the quantum Zeno and anti-Zeno effects in spin bath models: the spin-boson model and a spin-fermion model. We show that the Zeno-anti-Zeno transition is critically controlled by the system-bath coupling parameter, the same parameter that determines spin decoherence rate. We also discuss the crossover in a biased system, at high temperatures, and for a nonequilibrium spin-fermion system, manifesting the counteracting roles of electrical bias, temperature, and magnetic field on the spin decoherence rate.
Liquidity and the multiscaling properties of the volume traded on the stock market
Creators: name: Eisler, Zoltan
name: Kertesz, Janos
Publisher: name: arXiv
Year: 2006
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Finance (q-fin.ST)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: We investigate the correlation properties of transaction data from the New York Stock Exchange. The trading activity f(t) of each stock displays a crossover from weaker to stronger correlations at time scales 60-390 minutes. In both regimes, the Hurst exponent H depends logarithmically on the liquidity of the stock, measured by the mean traded value per minute. All multiscaling exponents tau(q) display a similar liquidity dependence, which clearly indicates the lack of a universal form assumed by other studies. The origin of this behavior is both the long memory in the frequency and the size of consecutive transactions.
description: 7 pages, 3 figures, submitted to Europhysics Letters
An Open Science Voice for the Humanities
Creators: name: Tóth-Czifra, Erzsébet
Publisher: name: Zenodo
Year: 2021
Subjects: OIAR

description: Part of the Bazaar, a showcase of different approaches to the mobilisation and dissemination of Open Science.
description: Primary funding was provided by the Social Science and Humanities Research Council of Canada (SSHRC), with addition financial and in-kind support provided by Eclac, FORCE11, and the Sloan Foundation through the Reimagining Educational Practices for Open (REPO) project.
title: Eyewitness to History: Documenting a Divided City
title: Divided Baltimore
titleType: AlternativeTitle
Creators: name: Hagan, Siobhan
Publisher: name: Maryland Shared Open Access Repository
Year: 2015
Subjects: History
Baltimore
Special Collections
Archives

description: This PowerPoint presentation was given during the course lecture for University of Baltimore's "Divided Baltimore: How Did We Get Here? Where Do We Go?" class on September 14, 2015. The presentation introduces the unique documents of Baltimore's history of segregation in the Special Collections Department of the University of Baltimore's Langsdale Library, focusing on the WMAR-TV and WJZ-TV Collections by showcasing selected audiovisual clips.
description: University of Baltimore, University of Baltimore's Office of Academic Innovation
On the Correlation between L Dwarf Optical and Infrared Variability and Radio Aurorae
Creators: name: Richey-Yowell, Tyler
name: Kao, Melodie M.
name: Pineda, J. Sebastian
name: Shkolnik, Evgenya L.
name: Hallinan, Gregg
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Photometric variability attributed to cloud phenomena is common in L/T transition brown dwarfs. Recent studies show that such variability may also trace aurorae, suggesting that localized magnetic heating may contribute to observed brown dwarf photometric variability. We assess this potential correlation with a survey of 17 photometrically variable brown dwarfs using the Karl G. Jansky Very Large Array (VLA) at 4 -- 8 GHz. We detect quiescent and highly circularly polarized flaring emission from one source, 2MASS J17502484-0016151, which we attribute to auroral electron cyclotron maser emission. The detected auroral emission extends throughout the frequency band at $\sim$5 -- 25$σ$, and we do not detect evidence of a cutoff. Our detection confirms that 2MASS J17502484-0016151 hosts a magnetic field strength of $\geq$2.9 kG, similar to those of other radio-bright ultracool dwarfs. We show that H$α$ emission continues to be an accurate tracer of auroral activity in brown dwarfs. Supplementing our study with data from the literature, we calculate the occurrence rates of quiescent emission in L dwarfs with low- and high-amplitude variability and conclude that high amplitude O/IR variability does not trace radio magnetic activity in L dwarfs.
description: 26 pages, 5 figures, 6 tables
Subgraph Ensembles and Motif Discovery Using a New Heuristic for Graph Isomorphism
Creators: name: Baskerville, Kim
name: Paczuski, Maya
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: A new heuristic based on vertex invariants is developed to rapidly distinguish non-isomorphic graphs to a desired level of accuracy. The method is applied to sample subgraphs from an E.coli protein interaction network, and as a probe for discovery of extended motifs. The network's structure is described using statistical properties of its $N$-node subgraphs for $N\leq 14$. The Zipf plots for subgraph occurrences are robust power laws that do not change when rewiring the network while fixing the degree sequence -- although the specific subgraphs may exchange ranks. However the exponent depends on $N$. The study of larger subgraphs highlights some striking patterns for various $N$. Motifs, or connected pieces that are over-abundant in the ensemble of subgraphs, have more edges, for a given number of nodes, than antimotifs and generally display a bipartite structure or tend towards a complete graph. In contrast, antimotifs, which are under-abundant connected pieces, are mostly trees or contain at most a single, small loop. The extension to directed graphs is straightforward.
description: 13 pages, 14 figures
La nascita dell’amministrazione parlamentare tra storia e organizzazione
Creators: name: Romanelli, Mauro
Publisher: name: ----
Year: 2023
Subjects: amministrazioni parlamentari, parlamenti, cambiamento organizzativo, storia

description: I Parlamenti non potrebbero svolgere effettivamente le proprie funzioni senza il supporto di strutture amministrative serventi. L’evoluzione organizzativa delle amministrazioni parlamentari si sviluppa nel momento in cui emerge la necessità di una assistenza tecnico-specialistica per l’assemblea parlamentare. La storia consente di comprendere il presente, l’evoluzione delle organizzazioni nel tempo per apprezzarne le dinamiche di cambiamento. Le organizzazioni, risultato dell’adattamento all’ambiente istituzionale, adottano pratiche consolidate e modelli riconosciuti nel sistema di relazioni sociali che ne condizionano l’autonomia, per acquisire legittimità quale risorsa organizzativa. Alcuni modelli di riferimento, storicamente e socialmente legittimati ed accettabili, sembrano aver orientato l’innovazione organizzativa nel percorso storico di nascita delle amministrazioni parlamentari presso la Camera dei Deputati nel Regno d’Italia, che si realizza con l’istituzione della posizione e del ruolo del Segretario Generale (1907): il modello organizzativo riferibile all’esperienza dell’Assemblea Nazionale in Francia; il ruolo del Segretario Generale nei Ministeri; i compiti del Clerk alla Camera dei Comuni; lo sviluppo e l’evoluzione professionale delle amministrazioni pubbliche di inizio Novecento.
description: ----, Vol 14, No 4 (2023): ISSUE 4/2023
Relativistic Radiative Flow in a Luminous Disk
Creators: name: Fukue, Jun
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Radiatively driven transfer flow perpendicular to a luminous disk was examined under a fully special relativistic treatment, taking into account radiation transfer. The flow was assumed to be vertical, and the gravity, the gas pressure, and the viscous heating were ignored. In order to construct the boundary condition at the flow top, the magic speed above the flat source was re-examined, and it was found that the magic speed above a moving source can exceed that above a static source ($\sim 0.45~c$). Then, the radiatively driven flow in a luminous disk was numerically solved, from the flow base (disk ``inside''), where the flow speed is zero, to the flow top (disk ``surface''), where the optical depth is zero. For a given optical depth and appropriate initial conditions at the flow base, where the flow starts, a loaded mass in the flow was obtained as an eigenvalue of the boundary condition at the flow top. Furthermore, a loaded mass and the flow final speed at the flow top were obtained as a function of the radiation pressure at the flow base; the flow final speed increases as the loaded mass decreases. Moreover, the flow velocity and radiation fields along the flow were obtained as a function of the optical depth. Within the present treatment, the flow three velocity $v$ is restricted to be within the range of $v < c/\sqrt{3}$, which is the relativistic sound speed, due to the relativistic effect.
description: 8 pages, 5 figures