cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Social Exclusion of Marginalized Minorities in Kaffa, Ethiopia
Creators: name: Taddesse, Berisso
Publisher: name: Ethiopian Journal of Human Rights
Year: 2023

description: This article examines the situation of marginalized minority groups in Kaffa Zone, Southern Nations, Nationalities and People’s Regional State. It critically reflects on the aspect of social exclusion of two social minority groups, the Mano (tanners and potters) and Manjo (descendants of former hunter-gatherers and wood workers). The article examines how long-lived practice of social exclusion affects the groups in a wide range of ways preventing them from participating in social, economic and political life, and enjoying their basic rights. The Manjo and Mano are discriminated in every aspect of human interaction and are excluded from mainstream social life of the society. They are economically disadvantaged, politically disempowered, socially excluded, culturally subordinated, and spatially segregated. This in turn, contributed to their abject poverty and destitute life as aptly captured in this article. It is argued in this article that, the problem of exclusion of minority groups in Kaffa Zone has structural, socio-economic elements that tend to be trivialized often escaping the attention of policy makers. Consecutive visits made to five woredas of the Kaffa zone over the last fifteen years allowed the writer to get rich insight and on the issues under discussion
description: Ethiopian Journal of Human Rights, Vol. 5 (2020): Ethiopian Journal of Human Rights
Eigenstate Thermalization Hypothesis and Free Probability
Creators: name: Pappalardi, Silvia
name: Foini, Laura
name: Kurchan, Jorge
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum thermalization is well understood via the Eigenstate Thermalization Hypothesis (ETH). The general form of ETH, describing all the relevant correlations of matrix elements, may be derived on the basis of a `typicality' argument of invariance with respect to local rotations involving nearby energy levels. In this work, we uncover the close relation between this perspective on ETH and Free Probability theory, as applied to a thermal ensemble or an energy shell. This mathematical framework allows one to reduce in a straightforward way higher-order correlation functions to a decomposition given by minimal blocks, identified as free cumulants, for which we give an explicit formula. This perspective naturally incorporates the consistency property that local functions of ETH operators also satisfy ETH. The present results uncover a direct connection between the Eigenstate Thermalization Hypothesis and the structure of Free Probability, widening considerably the latter's scope and highlighting its relevance to quantum thermalization.
description: 5 pages, 2 figures and 5 pages of supplementary material. This paper has been submitted simultaneously with "Dynamics of Fluctuations in the Open Quantum SSEP and Free Probability" by L. Hruza and D. Bernard, which discusses the appearance of free cumulants in stochastic a transport model
Optimal propulsive flapping in Stokes flows
Creators: name: Was, Loic
name: Lauga, Eric
Publisher: name: arXiv
Year: 2014
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Swimming fish and flying insects use the flapping of fins and wings to generate thrust. In contrast, microscopic organisms typically deform their appendages in a wavelike fashion. Since a flapping motion with two degrees of freedom is able, in theory, to produce net forces from a time-periodic actuation at all Reynolds number, we compute in this paper the optimal flapping kinematics of a rigid spheroid in a Stokes flow. The hydrodynamics for the force generation and energetics of the flapping motion is solved exactly. We then compute analytically the gradient of a flapping efficiency in the space of all flapping gaits and employ it to derive numerically the optimal flapping kinematics as a function of the shape of the flapper and the amplitude of the motion. The kinematics of optimal flapping are observed to depend weakly on the flapper shape and are very similar to the figure-eight motion observed in the motion of insect wings. Our results suggest that flapping could be a exploited experimentally as a propulsion mechanism valid across the whole range of Reynolds numbers.
Qubit from the classical collision entropy
Creators: name: Onggadinata, Kelvin
name: Kurzynski, Pawel
name: Kaszlikowski, Dagomir
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: An orthodox formulation of quantum mechanics relies on a set of postulates in Hilbert space supplemented with rules to connect it with classical mechanics such as quantisation techniques, correspondence principle, etc. Here we deduce a qubit and its dynamics straightforwardly from a discrete deterministic dynamics and conservation of the classical collision entropy. No Hilbert space is required although it can be inferred from this approach if necessary.
description: 7 pages
Ethnicity, Women and Governance at Local Level: The Case of the Kebena Community in Ethiopian Federalism
Creators: name: Sisay, Kinfe
Publisher: name: Ethiopian Journal of Human Rights
Year: 2023

description: The policy promoting multicultural accommodation in Ethiopian federalism made ethnicity the main criteria to get territorial autonomy either at regional or local level though several ethnic minorities, including the Kebena, have not yet achieved this right. To exercise the right to self-determination, elites of the Kebena ethno-cultural community wrote the customary law of the community, which has been preserved for long through oral traditions. The written customary law prioritizes collective ethno-cultural rights both in the public and personal spheres. This contravenes individual citizens’ rights, which is vividly seen with regard to women’s marital rights. The lived experiences of women in the community show that customary and religious institutions are the main actors in the regulation of marital rights. Since the introduction of ethnic federalism, the role of these institutions is recognized by the state. Both the customary and the state institutions at local level, without undermining the significance of constitutional recognition of women’s rights, ignore its implementation considering it primarily as part of collective rights. The article concludes, without the provision of basic standard of living and commitment of the state at local level to protect women’s individual human rights, it would be difficult for a woman within identity coffering community to exercise exit and claim marital rights.
description: Ethiopian Journal of Human Rights, Vol. 5 (2020): Ethiopian Journal of Human Rights
digital@IANLS: Wikidata for Neo-Latinists. Part II
Creators: name: Winkler, Alexander
Publisher: name: Zenodo
Year: 2023
Subjects: subject: SPARQL
subject: Wikidata
subject: Neo-Latin
subject: http://www.wikidata.org/entity/Q1248221
subject: http://www.wikidata.org/entity/Q54871

description: Slides for the second event in the digital@IANLS series, organized by the Committee for Digital Resources of the International Association for Neo-Latin Studies (IANLS). The workshop which took place online on Feb 24, 2023 provided an introduction to SPARQL and Wikidata Query Service for Neo-Latinists.
Minimally invasive treatment of urolithiasis in children: evaluation of the use of flexible ureterorenoscopy and laser lithotripsy
Creators: name: Garzi, Alfredo
name: Prestipino, Marco
name: Calabrò, Eleonora
name: Di Crescenzo, Rosa Maria
name: Rubino, Maria Serena
Publisher: name: Universita' degli Studi di Salerno
Year: 2020
Subjects: Urolithiasis
Pediatric age
Flexible ureterorenoscopy
Laser lithotripsy

description: Urolithiasis is a multifactorial disease; in recent years, its incidence has gradually increased in pediatric age. Among the factors involved in urolithiasis pathophysiology, urinary tract anomalies and metabolic diseases are the most relevant, although ethnicity and environmental factors may have an important role. The advances in technology and miniaturization of endoscopic devices have permitted the use of Retrograde Intrarenal Surgery (RIRS) to treat kidney and ureteral stones. Nowadays, flexible ureterorenoscopy and laser lithotripsy, which are techniques that have been applied in the management of adult upper urinary tract disorders, are also used in children as a minimally invasive treatment of urolithiasis with encouraging, effective and safe results. The Authors report a retrospective review of their record of cases considering 21 pediatric urolithiasis treatment procedures performed between October 2017 and April 2019 in a total of 17 patients (10 males and 7 females). Six procedures involved the use of the flexible ureterorenoscope (FURS) while in 15 procedures the application of the laser fiber was used (FURSL). A case of laser lithotripsy for bladder stone was included. The average age of patients was 10.5 years (2-18 years). The renal pelvis dilatation pretreatment was evaluated in post-operative follow-up. From the evaluation of the sample in analysis, the use of RIRS has good results in the treatment of paediatric urolithiasis, emerging as a valid option in the management of the paediatric population in terms of efficacy and safety, with an improvement in patient outcomes.
Dissecting flux balances to measure energetic costs in cell biology: techniques and challenges
Creators: name: Arunachalam, Easun
name: Ireland, William
name: Yang, Xingbo
name: Needleman, Dan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Life is a nonequilibrium phenomenon: metabolism provides a continuous supply of energy that drives nearly all cellular processes. However, very little is known about how much energy different cellular processes use, i.e. their energetic costs. The most direct experimental measurements of these costs involve modulating the activity of cellular processes and determining the resulting changes in energetic fluxes. In this review, we present a flux balance framework to aid in the design and interpretation of such experiments, and discuss the challenges associated with measuring the relevant metabolic fluxes. We then describe selected techniques that enable measurement of these fluxes. Finally, we review prior experimental and theoretical work that has employed techniques from biochemistry and nonequilibrium physics to determine the energetic costs of cellular processes.
description: 27 pages, 3 figures
The Greenland Telescope (GLT): Antenna status and future plans
Creators: name: Raffin, Philippe
name: Algaba-Marcos, Juan Carlos
name: Asada, Keichi
name: Blundell, Raymond
name: Burgos, Roberto
name: Chang, Chih-Cheng
name: Chen, Ming-Tang
name: Christensen, Robert
name: Grimes, Paul K.
name: Han, C. C.
name: Ho, Paul T. P.
name: Huang, Yau-De
name: Inoue, Makoto
name: Koch, Patrick M.
name: Kubo, Derek
name: Leiker, Steve
name: Liu, Ching-Tang
name: Martin-Cocher, Pierre
name: Matsushita, Satoki
name: Nakamura, Masanori
name: Nishioka, Hiroaki
name: Nystrom, George
name: Paine, Scott N.
name: Patel, Nimesh A.
name: Pradel, Nicolas
name: Pu, Hung-Yi
name: Shen, H. -Y.
name: Snow, William
name: Sridharan, T. K.
name: Srinivasan, Ranjani
name: Tong, Edward
name: Wang, Jackie
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The ALMA North America Prototype Antenna was awarded to the Smithsonian Astrophysical Observatory (SAO) in 2011. SAO and the Academia Sinica Institute of Astronomy & Astrophysics (ASIAA), SAO's main partner for this project, are working jointly to relocate the antenna to Greenland to carry out millimeter and submillimeter VLBI observations. This paper presents the work carried out on upgrading the antenna to enable operation in the Arctic climate by the GLT Team to make this challenging project possible, with an emphasis on the unexpected telescope components that had to be either redesigned or changed. Five-years of inactivity, with the antenna laying idle in the desert of New Mexico, coupled with the extreme weather conditions of the selected site in Greenland have it necessary to significantly refurbish the antenna. We found that many components did need to be replaced, such as the antenna support cone, the azimuth bearing, the carbon fiber quadrupod, the hexapod, the HVAC, the tiltmeters, the antenna electronic enclosures housing servo and other drive components, and the cables. We selected Vertex, the original antenna manufacturer, for the main design work, which is in progress. The next coming months will see the major antenna components and subsystems shipped to a site of the US East Coast for test-fitting the major antenna components, which have been retrofitted. The following step will be to ship the components to Greenland to carry out VLBI and single dish observations. Antenna reassembly at Summit Station should take place during the summer of 2018.
description: 10 pages, 8 figures
The Impact of Large-Scale Development Projects on the Kumpal Agaw Minority
Creators: name: Desalegn, Amsalu
Publisher: name: Ethiopian Journal of Human Rights
Year: 2023

description: Ethiopia was hailed as one of the fast-growing countries from 2004 to 2015. Under the Growth and Transformation Plan I (GTP I), which ran from 2009/2010 to 2014/2015, the country launched a transformative development plan. Subsequently, many state-owned mega-projects were designed with the aim to improve the country’s economy and improve peoples’ lives. However, the livelihood of local communities that hosted these projects has been disrupted. The Kumpal of northwest Ethiopia are one of the minority groups that hosted large-scale development projects intervention, three sugar development projects under GTP I. The Kumpal have experienced disruption in their livelihood, without benefiting much from the employment opportunities created by the projects due to the lack of educated manpower qualifying for the positions. They also benefited less from compensations, both in cash and in land, for being displaced from their places of residence. The implementation of the projects was also incompatible to the host community’s socio-cultural institutions and values. Despite favourable constitutional provisions for the right to development of disadvantaged ethnic communities and the state’s obligation to support them, development planners have overlooked the effects of large-scale development sugar projects on the host Kumpal community. The article recommends similar future projects should consider socio-economic consequences on local communities. The sugar development projects, yet under construction after having been delayed due to corruption, should also work on re-strengthening the Kumpal livelihood and support the community to continue as a viable group
description: Ethiopian Journal of Human Rights, Vol. 5 (2020): Ethiopian Journal of Human Rights
Connecting Higher-Order Topology with the Orbital Hall Effect in Monolayers of Transition Metal Dichalcogenides
Creators: name: Costa, Marcio
name: Focassio, Bruno
name: Cysne, Tarik P.
name: Canonico, Luis M.
name: Schleder, Gabriel R.
name: Muniz, Roberto B.
name: Fazzio, Adalberto
name: Rappoport, Tatiana G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Monolayers of transition metal dichalcogenides (TMDs) in the 2H structural phase have been recently classified as higher-order topological insulators (HOTI), protected by $C_3$ rotation symmetry. In addition, theoretical calculations show an orbital Hall plateau in the insulating gap of TMDs, characterized by an orbital Chern number. We explore the correlation between these two phenomena in TMD monolayers in two structural phases: the noncentrosymmetric 2H and the centrosymmetric 1T. Using density functional theory, we confirm the characteristics of 2H-TMDs and reveal that 1T-TMDs are identified by a $\mathbb{Z}_4$ topological invariant. As a result, when cut along appropriate directions, they host conducting edge-states, which cross their bulk energy-band gaps and can transport orbital angular momentum. Our linear response calculations thus indicate that the HOTI phase is accompanied by an orbital Hall effect. Using general symmetry arguments, we establish a connection between the two phenomena with potential implications for spin-orbitronics.
description: 5 pages, 4 figures
On Provable Security of Entity Authentication Schemes
Creators: name: Flores, Manuela
Publisher: name: Universita degli studi di Salerno
Year: 2019
Subjects: subject: INF/01 INFORMATICA
subject: Authentication schemes
subject: One-time password
subject: Provable security

description: 2017 - 2018
description: Entity authentication is the process allowing a user, in a distributed system, to gain confidence in the identity of one (or more) communication user. Such a process may be either unilateral (the users are involved in a conversation in which only one of them, called the verifier, gains confidence that it is the other, called the prover, with whom he is speaking) or mutual (both users gain confidence about the identity of the communication partner). Moreover, the users might share some secret information, or might not. A one-message unilateral entity authentication scheme allows one party, called the prover, to authenticate himself, i.e. to prove his identity, to another party, called the verifier, by sending a single authentication message. We consider schemes where the prover and the verifier do not share any secret information, such as a password, in advance. We propose the first theoretical characterization for one-message unilateral entity authentication schemes, by formalizing the security requirements for such schemes with respect to different kinds of passive and active adversaries. More in details, we consider both static and adaptive adversaries for each kind of attack (passive/active). Afterwards, we explore the relationships between the security notions resulting from different adversarial behaviours for one-message unilateral entity authentication scheme. Finally, we propose three different constructions for one-message unilateral entity authentication schemes and analyse their security with respect to the different security notions previously formalized in the work. [edited by Author]
A universal quantum rewinding protocol with an arbitrarily high probability of success
Creators: name: Trillo, David
name: Dive, Benjamin
name: Navascués, Miguel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a universal mechanism that, acting on any target qubit, propagates it to the state it had T time units before the experiment started. This protocol works by setting the target on a superposition of flight paths, where it is acted on by uncharacterized, but repeatable, quantum operations. Independently of the effect of each of these individual operations on the target, the successful interference of the paths causes it to leap to its past state. We prove that, for generic interaction effects, the system will reach the desired state with probability 1 after some finite number of steps.
description: 4+4 pages, 3 figures
The Empirical Commit Frequency Distribution of Open Source Projects
Creators: name: Kolassa, Carsten
name: Riehle, Dirk
name: Salim, Michel A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences
subject: D.2.8; D.2.9; D.m

description: A fundamental unit of work in programming is the code contribution ("commit") that a developer makes to the code base of the project in work. An author's commit frequency describes how often that author commits. Knowing the distribution of all commit frequencies is a fundamental part of understanding software development processes. This paper presents a detailed quantitative analysis of commit frequencies in open-source software development. The analysis is based on a large sample of open source projects, and presents the overall distribution of commit frequencies. We analyze the data to show the differences between authors and projects by project size; we also includes a comparison of successful and non successful projects and we derive an activity indicator from these analyses. By measuring a fundamental dimension of programming we help improve software development tools and our understanding of software development. We also validate some fundamental assumptions about software development.
description: 8 pages, 7 figures. WikiSym '13 Proceedings of the 9th International Symposium on Open Collaboration
Spectral properties of the largest asteroids associated with Taurid Complex
Creators: name: Popescu, M.
name: Birlan, M.
name: Nedelcu, D. A.
name: Vaubaillon, J.
name: Cristescu, C. P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We obtained spectra of six of the largest asteroids (2201, 4183, 4486, 5143, 6063, and 269690) associated with Taurid complex. The observations were made with the IRTF telescope equipped with the spectro-imager SpeX. Their taxonomic classification is made using Bus-DeMeo taxonomy. The asteroid spectra are compared with the meteorite spectra from the Relab database. Mineralogical models were applied to determine their surface composition. All the spectral analysis is made in the context of the already published physical data. Five of the objects studied in this paper present spectral characteristics similar to the S taxonomic complex. The spectra of ordinary chondrites (spanning H, L, and LL subtypes) are the best matches for these asteroid spectra. {\bf The asteroid} (269690) 1996 RG3 presents a flat featureless spectrum which could be associated to a primitive C-type object. The increased reflectance above 2.1 microns constrains its geometrical albedo to a value around 0.03. While there is an important dynamical grouping among the Taurid Complex asteroids, the spectral data of the largest objects do not support a common cometary origin. Furthermore, there are significant variations between the spectra acquired until now.
description: Accepted for publication in A&A
Rola profilaktyki antykryzysowej z perspektywy największych polskich przedsiębiorstw oraz agencji public relations na podstawie badań eksperckich
Creators: name: Tworzydło, Dariusz
Publisher: name: figshare
Year: 2022
Subjects: subject: 200104 Media Studies
subject: FOS: Media and communications

description: DOI: 10.2478/minib-2019-0006
Fate of the Quasi-condensed State for Bias-driven Hard-Core Bosons in one Dimension
Creators: name: Puel, T. O.
name: Chesi, S.
name: Kirchner, S.
name: Ribeiro, P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Bosons in one dimension display a phenomenon called quasi-condensation, where correlations decay in a powerlaw fashion. We study the fate of quasi-condensation in the non-equilibrium steady-state of a chain of hard-core bosons coupled to macroscopic leads which are held at different chemical potentials. It is found that a finite bias destroys the quasi-condensed state and the critical scaling function of the quasi-condensed fraction, near the zero bias transition, is determined. Associated critical exponents are determined and numerically verified. Away from equilibrium, the system exhibits exponentially decaying correlations that are characterized by a bias-dependent correlation length that diverges in equilibrium. In addition, power-law corrections are found, which are characterized by an exponent that depends on the chain-leads coupling and is non-analytic at zero bias. This exactly-solvable nonequilibrium strongly-interacting system has the remarkable property that, the near-equilibrium state at infinitesimal bias, cannot be obtained within linear response. These results aid in unraveling the intricate properties spawned by strong interactions once liberated from equilibrium constraints.
description: 7 pages, 4 figures
Intersite Coulomb Interactions in Charge Ordered Systems
Creators: name: Jang, Bo Gyu
name: Kim, Minjae
name: Lee, Sang-Hoon
name: Yang, Wooil
name: Jhi, Seung-Hoon
name: Son, Young-Woo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Using {\it ab initio} approaches for extended Hubbard interactions coupled to phonons, we reveal that the intersite Coulomb interaction plays important roles in determining various distinctive phases of the paradigmatic charge ordered materials of Ba$_{1-x}$K$_x A$O$_3$ ($A=$ Bi and Sb). We demonstrated that all their salient doping dependent experiment features such as breathing instabilities, anomalous phonon dispersions, and transition between charge-density wave and superconducting states can be accounted very well if self-consistently obtained nearest neighbor Hubbard interaction are included, thus establishing a minimal criterion for reliable descriptions of spontaneous charge orders in solids.
description: 4 pages, 2 additional pages for references and 4 pages supplementary materials, title and abstract are modified
Supplementary File from An investigation of a novel broad autism phenotype: increased facial masculinity among parents of children on the autism spectrum
Creators: name: Tan, Diana Weiting
name: Gilani, Syed Zulqarnain
name: Alvares, Gail A.
name: Mian, Ajmal
name: Whitehouse, Andrew J. O.
name: Maybery, Murray T.
Publisher: name: The Royal Society
Year: 2022
Subjects: subject: Developmental Biology
subject: 60801 Animal Behaviour
subject: FOS: Biological sciences

description: Table S1. Correlations between facial masculinity scores, facial distances, facial area, and parents’ ages during time of data collection. Table S2. Null hypothesis testing statistics for the effect of sex (males vs. females) on facial masculinity scores and facial distances (in mm) of parents of autistic children and parents of non-autistic children.
Measuring Galactic Dark Matter through Unsupervised Machine Learning
Creators: name: Buckley, Matthew R
name: Lim, Sung Hak
name: Putney, Eric
name: Shih, David
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Measuring the density profile of dark matter in the Solar neighborhood has important implications for both dark matter theory and experiment. In this work, we apply autoregressive flows to stars from a realistic simulation of a Milky Way-type galaxy to learn -- in an unsupervised way -- the stellar phase space density and its derivatives. With these as inputs, and under the assumption of dynamic equilibrium, the gravitational acceleration field and mass density can be calculated directly from the Boltzmann Equation without the need to assume either cylindrical symmetry or specific functional forms for the galaxy's mass density. We demonstrate our approach can accurately reconstruct the mass density and acceleration profiles of the simulated galaxy, even in the presence of Gaia-like errors in the kinematic measurements.
description: 23 pages, 9 figures
Friedmann-like universes with non-metricity
Creators: name: Iosifidis, Damianos
name: Vogiatzis, Ioannis Georgios
name: Tsagas, Christos G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the potential effects of spacetime non-metricity in cosmology. In the spirit of Einstein-Cartan gravity, but with non-metricity replacing torsion, we consider the Einstein-Hilbert action and assume zero torsion. Adopting certain hyperfluid models, with non-vanishing hypermomentum that can source spacetime non-metricity, we add a matter component into the action and derive the field equations, along with the conservation laws. Applying our formulae to cosmology, we generalize the Friedmann and the Raychaudhuri equations in the presence of non-metricity. Our results show that, in a number of cases, non-metricity can mimic the effects of matter with unconventional equation of state. For instance, specific types of hypermomentum are found to act as an effective stiff fluid, thus opening the possibility that non-metricity could have played a significant role in the early stages of the universe's evolution. Alternative forms of hypermomentum can dominate the universal dynamics at late times. In either case, the equilibrium moment depends on the initial conditions and it is determined by a simple relation between the matter component and the hyperfluid.
description: 19 pages, no figures
Stochastic dynamics of active swimmers in linear flows
Creators: name: Sandoval, Mario
name: M., Navaneeth K.
name: Subramanian, Ganesh
name: Lauga, Eric
Publisher: name: arXiv
Year: 2014
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Most classical work on the hydrodynamics of low-Reynolds-number swimming addresses deterministic locomotion in quiescent environments. Thermal fluctuations in fluids are known to lead to a Brownian loss of the swimming direction. As most cells or synthetic swimmers are immersed in external flows, we consider theoretically in this paper the stochastic dynamics of a model active particle (a self-propelled sphere) in a steady general linear flow. The stochasticity arises both from translational diffusion in physical space, and from a combination of rotary diffusion and run-and-tumble dynamics in orientation space. We begin by deriving a general formulation for all components of the long-time mean square displacement tensor for a swimmer with a time-dependent swimming velocity and whose orientation decorrelates due to rotary diffusion alone. This general framework is applied to obtain the convectively enhanced mean-squared displacements of a steadily-swimming particle in three canonical linear flows (extension, simple shear, and solid-body rotation). We then show how to extend our results to the case where the swimmer orientation also decorrelates on account of run-and-tumble dynamics. Self-propulsion in general leads to the same long-time temporal scalings as for passive particles in linear flows but with increased coefficients. In the particular case of solid-body rotation, the effective long-time diffusion is the same as that in a quiescent fluid, and we clarify the lack of flow-dependence by briefly examining the dynamics in elliptic linear flows. By comparing the new active terms with those obtained for passive particles we see that swimming can lead to an enhancement of the mean-square displacements by orders of magnitude, and could be relevant for biological organisms or synthetic swimming devices in fluctuating environmental or biological flows.
Enhancing the Dynamic Range of Targeted Energy Transfer in Acoustics Using Several Nonlinear Membrane Absorbers
Creators: name: Bellet, Romain
name: Cochelin, Bruno
name: Côte, Renaud
name: Mattei, Pierre-Olivier
Publisher: name: arXiv
Year: 2014
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: In order to enhance the robustness and the energy range of efficiency of targeted energy transfer (TET) phenomena in acoustics, we discuss in this paper about the use of multiple nonlinear membrane absorbers in parallel. We show this way, mainly thanks to an experimental set-up with two membranes, that the different absorbers have additional effects that extend the efficiency and the possibilities of observation of TET. More precisely, we present the different behavior of the system under sinusoidal forcing and free oscillations, characterizing the phenomena for all input energies. The frequency responses are also presented, showing successive clipping of the original resonance peak of the system. A model is finally used to generalize these results to more than two NES and to simulate the case of several very similar membranes in parallel which shows how to extend the existence zone of TET.
Observational constraints of an anisotropic boost due to the projection effects using redMaPPer clusters
Creators: name: Sunayama, Tomomi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Optical clusters identified from red-sequence galaxies suffer from projection effects, where interloper galaxies along the line-of-sight to a cluster are mistaken as genuine members of the cluster. In the previous study (Sunayama et al. 2020), we found that the projection effects cause the boost on the amplitudes of clustering and lensing on large scale compared to the expected amplitudes in the absence of any projection effects. These boosts are caused by preferential selections of filamentary structure aligned to the line-of-sight due to distance uncertainties in photometric surveys. We model the projection effects with two simple assumptions and develop a novel method to quantify the size of the boost using cluster-galaxy cross-correlation functions. We validate our method using mock cluster catalogs built from cosmological N-body simulations and find that we can obtain unbiased constraints on the boost parameter with our model. We then apply our analysis on the SDSS redMaPPer clusters and find that the size of the boost is roughly 20% for all the richness bins except the cluster sample with the richness bin $λ\in [30,40]$. This is the first study to constrain the boost parameter independent from cluster cosmology studies and provides a self-consistency test for the projection effects.
description: 13 pages, 11 figures
Entanglement properties of positive operators with ranges in completely entangled subspaces
Creators: name: Sengupta, R
name: Arvind
name: Singh, Ajit Iqbal
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Functional Analysis (math.FA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We prove that the projection on a completely entangled subspace S of maximum dimension in a multipartite quantum system obtained by Parthasarathy is not positive under partial transpose. We next show that several positive operators with range in S also have the same property. In this process we construct an orthonormal basis of S and provide a linking theorem to link the constructions of completely entangled subspaces due to Parthasarthy, Bhat and Johnston.
description: 14 pages
Detailed study of the 2010-2014 Pollino (Italy) seismic sequence with absorption and scattering imaging of the surrounding area
Creators: name: Napolitano, Ferdinando
Publisher: name: Universita degli studi di Salerno
Year: 2020
Subjects: subject: GEO/10 GEOFISICA DELLA TERRA SOLIDA
subject: Seismic sequence
subject: Coda attenuation
subject: Site effects

description: 2018 - 2019
description: A detailed study of the seismic sequence occurred in the western sector of the Pollino Range (Southern Italy) between 2010 and 2014, and an imaging of the surrounding area, have been performed in this thesis. The sequence, occurred in this area considered as a seismic gap in the transition zone between the Calabrian Arc and the Southern Apennines, developed as a seismic swarm, rather than an aftershock sequence. The large number of small-to-medium earthquakes (mL < 5.0) recorded by the seismic stations operated by different institutions in the area allowed to: 1) perform high quality imaging and characterization of the seismogenic volume responsible for the Pollino swarm using relative location technique; 2) characterize the properties of the medium involved during the swarm and nearby, separating scattering and absorption contribution to the total attenuation of coda waves; 3) assess site effects for seismic risk mitigation purpose by applying HVSR technique and polarization analysis... [edited by the Author]
Kinetic Term Anarchy for Polynomial Chaotic Inflation
Creators: name: Nakayama, Kazunori
name: Takahashi, Fuminobu
name: Yanagida, Tsutomu T.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We argue that there may arise a relatively flat inflaton potential over super-Planckian field values with an approximate shift symmetry, if the coefficients of the kinetic terms for many singlet scalars are subject to a certain random distribution. The inflaton potential generically contains various shift-symmetry breaking terms, leading to a possibly large deviation of the predicted values of the spectral index and tensor-to-scalar ratio from those of the simple quadratic chaotic inflation. We revisit a polynomial chaotic inflation in supergravity as such.
description: 16 pages
SELECTED ASPECTS OF PUBLIC RELATIONS ACTIVITY ORGANISATION IN POLISH ENTERPRISES
Creators: name: Tworzydło, Dariusz
Publisher: name: figshare
Year: 2022
Subjects: subject: 200104 Media Studies
subject: FOS: Media and communications

description: Public relations activity is treated as an element ensuring the desired reception of the company with the public. Against a general background on public relations, the article presents selected aspects of organising activities within that scope by the largest Polish enterprises. The analysed entities mostly conduct public relations activities basing on their own services. Every fifth one, however, uses the assistance of external PR agencies. It is still puzzling that representatives of almost every third company claim they do not conduct regular activity such as could be viewed as public relations. From the point of view of organising PR activities important is also the place taken by PR departments or units in cor?porate structure. The necessity of conducting current communication policy requiring very quick reactions indicates clearly that PR department should be directly subordinated to the highest management level. This subordination model dominates in Polish companies and concerns nearly 68% of the analysed subjects. Sometimes there occurs a not fully realised distinction between PR and marketing. The activities in both these spheres should complement each other, which in turn would increase the effectiveness of corporate communication. Good cooperation of the two departments should allow to benefit from synergy effects and lead to cost reduction in communication activity. In almost half of the analysed Polish companies, the distinction between marketing and PR is visible in their organisational structure, for there are in?dependent marketing and PR departments/units. In every third analysed company there is only a marketing department, performing also activities assumed to belong to public relations. In three out of four companies no conflicts are noted between the departments. The conflicts which do appear result from marketing and PR departments/units competing for financial means and sometimes from competence overlap
Modified Step Size for Enhanced Stochastic Gradient Descent: Convergence and Experiments
Creators: name: Shamaee, M. Soheil
name: Hafshejani, S. Fathi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: This paper introduces a novel approach to enhance the performance of the stochastic gradient descent (SGD) algorithm by incorporating a modified decay step size based on $\frac{1}{\sqrt{t}}$. The proposed step size integrates a logarithmic term, leading to the selection of smaller values in the final iterations. Our analysis establishes a convergence rate of $O(\frac{\ln T}{\sqrt{T}})$ for smooth non-convex functions without the Polyak-Łojasiewicz condition. To evaluate the effectiveness of our approach, we conducted numerical experiments on image classification tasks using the FashionMNIST, and CIFAR10 datasets, and the results demonstrate significant improvements in accuracy, with enhancements of $0.5\%$ and $1.4\%$ observed, respectively, compared to the traditional $\frac{1}{\sqrt{t}}$ step size. The source code can be found at \\\url{https://github.com/Shamaeem/LNSQRTStepSize}.
Exact Geometries from Boundary Gravity
Creators: name: Gupta, Rohit K.
name: Kar, Supriya
name: Nitish, R.
name: Verma, Monika
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that the extremal Reissner-Nordström type multi black holes in an emergent scenario are exact in General Relativity. It is shown that an axion in the bulk together with a geometric torsion ensure the required energy-momentum to source the $(3$$+$$1)$ geometry in the Einstein tensor. Analysis reveals a significant role of dark energy to the curved space-time.
description: 5 pages
Cosmological model-independent constraints on the baryon fraction in the IGM from fast radio bursts and supernovae data
Creators: name: Lemos, Thais
name: Gonçalves, Rodrigo S.
name: Carvalho, Joel C.
name: Alcaniz, Jailson S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Fast Radio Bursts (FRBs) are millisecond-duration radio transients with an observed dispersion measure ($DM$) greater than the expected Milky Way contribution, which suggests that such events are of extragalactic origin. Although some models have been proposed to explain the physics of the pulse, the mechanism behind the FRBs emission is still unknown. From FRBs data with known host galaxies, the redshift is directly measured and can be combined with estimates of the $DM$ to constrain the cosmological parameters, such as the baryon number density and the Hubble constant. However, the poor knowledge of the fraction of baryonic mass in the intergalactic medium ($f_{IGM}$) and its degeneracy with the cosmological parameters impose limits on the cosmological application of FRBs. In this work we present a cosmological model-independent method to determine the evolution of $f_{IGM}$ combining the latest FRBs observations with localized host galaxy and current supernovae data. We consider constant and time-dependent $f_{IGM}$ parameterizations and show, through a Bayesian model selection analysis, that a conclusive answer about the time-evolution of $f_{IGM}$ depend strongly on the $DM$ fluctuations due to the spatial variation in cosmic electron density ($δ$). In particular, our analysis show that the evidence varies from strong (in favor of a growing evolution of $f_{IGM}$ with redshift) to inconclusive, as larger values of $δ$ are considered.
description: 8 pages, 3 figures
Local characterization of ferromagnetic properties in ferromagnet/superconductor bilayer by Point Contact Andreev Reflection Spectroscopy
Creators: name: Giubileo, Filippo
name: Romeo, Francesco
name: Citro, Roberta
name: Di Bartolomeo, Antonio
name: Attanasio, Carmine
name: Cirillo, Carla
name: Polcari, Albino
name: Romano, Paola
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We realized point contact spectroscopy experiment on ferromagnet/superconductor bilayers. Differential conductance curves show several features that we explained within Bogoliubov-de Gennes formalism considering the presence of two interfaces in the normal-metal-tip/ferromagnet/superconductor device. We demonstrate that such configuration is suitable as local probe of the spin polarization and thickness of ferromagnetic layer, directly on bilayer areas. This is due to the high sensitivity of the Andreev surface states to the physical properties of the ferromagnetic interlayer.
Aharonov-Bohm Oscillations in a Quasi-Ballistic 3D Topological Insulator Nanowire
Creators: name: Cho, S.
name: Dellabetta, B.
name: Zhong, R. D.
name: Schneeloch, J.
name: Liu, T. S.
name: Gu, G.
name: Gilbert, Matthew J.
name: Mason, Nadya
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In three-dimensional topological insulators (3D TI) nanowires, transport occurs via gapless surface states where the spin is fixed perpendicular to the momentum[1-6]. Carriers encircling the surface thus acquire a πBerry phase, which is predicted to open up a gap in the lowest-energy 1D surface subband. Inserting a magnetic flux (Φ) of h/2e through the nanowire should cancel the Berry phase and restore the gapless 1D mode[7-8]. However, this signature has been missing in transport experiments reported to date[9-11]. Here, we report measurements of mechanically-exfoliated 3D TI nanowires which exhibit Aharonov-Bohm oscillations consistent with topological surface transport. The use of low-doped, quasi-ballistic devices allows us to observe a minimum conductance at Φ = 0 and a maximum conductance reaching e^2/h at Φ = h/2e near the lowest subband (i.e. the Dirac point), as well as the carrier density dependence of the transport.
description: 9 pages, 4 figures with additional Supplement
The Ages of Galactic Bulge Stars with Realistic Uncertainties
Creators: name: Joyce, Meridith
name: Johnson, Christian I.
name: Marchetti, Tommaso
name: Rich, R. Michael
name: Simion, Iulia
name: Bourke, John
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using modern isochrones with customized physics and carefully considered statistical techniques, we recompute the age distribution for a sample of 91 micro-lensed dwarfs in the Galactic bulge presented by Bensby et al. (2017) and do not produce an age distribution consistent with their results. In particular, our analysis finds that only 15 of 91 stars have ages younger than 7 Gyr, compared to their finding of 42 young stars in the same sample. While we do not find a constituency of very young stars, our results do suggest the presence of an $\sim8$ Gyr population at the highest metallicities, thus contributing to long-standing debate about the age--metallicity distribution of the Galactic bulge. We supplement this with attempts at independent age determinations from two sources of photometry, BDBS and \textit{Gaia}, but find that the imprecision of photometric measurements prevents reliable age and age uncertainty determinations. Lastly, we present age uncertainties derived using a first-order consideration of global modeling uncertainties in addition to standard observational uncertainties. The theoretical uncertainties are based on the known variance of free parameters in the 1D stellar evolution models used to generate isochrones, and when included, result in age uncertainties of $2$--$5$ Gyr for this spectroscopically well-constrained sample. These error bars, which are roughly twice as large as typical literature values, constitute realistic lower limits on the true age uncertainties.
description: accepted to ApJ; revisions complete