cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
THE HISTORICAL EVOLUTION OF INDIAN ART EDUCATION AND ITS RELEVANCE TODAY - AN ANALYTICAL STUDY
Creators: name: Dr. Satyamangal Rege
Publisher: name: Zenodo
Year: 2025

description: Art education in India has undergone significant transformations, reflecting the country’s rich cultural heritage, colonial influences, and contemporary global trends. From ancient gurukul systems to modern digital art institutions, the evolution of Indian art education has been shaped by historical, political, and technological changes. This paper explores the historical trajectory of Indian art education, analyzing its key milestones and their impact on artistic learning and practice today.

                The study begins by examining the role of traditional art education in ancient India, where artistic knowledge was passed down through oral traditions and apprenticeship systems within temple workshops and royal courts. The Mughal and colonial periods brought new artistic influences and institutional changes, including the establishment of formal art schools such as the Government College of Art in Calcutta (1854). These institutions introduced Western academic methods, altering indigenous artistic traditions.

                Post-independence, Indian art education shifted towards a fusion of traditional and modern approaches, with institutions like Kala Bhavana (Santiniketan) promoting experimental and indigenous artistic expressions. The emergence of contemporary art education has been further influenced by globalization, technology, and interdisciplinary learning, with digital tools and AI reshaping artistic pedagogy.

                This paper highlights the continuing relevance of art education in India, emphasizing its role in cultural preservation, creative industries, and personal development. As the education system evolves, balancing traditional artistic practices with modern innovations is crucial to fostering artistic excellence and cultural identity in the 21st century. By understanding the historical evolution of Indian art education, educators and policymakers can develop more inclusive and adaptive curricula that support creative thinking and artistic innovation in a rapidly changing world.

                Keywords: Indian art education, Historical evolution of art education, Traditional art learning, Gurukul system, Colonial influence on Indian art, Art academies in India, Santiniketan and modern art education, Contemporary art pedagogy, Digital art and technology in education, Cultural preservation in art education, Artistic innovation in India, Fine arts curriculum in India, Role of AI in art education
Negative refraction of a three-dimensional metallic photonic crystal
Creators: name: Mahmoudi, Ali
name: Semnani, Abbas
name: Alizadeh, Ramazan
name: Adeli, Roohollah
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A metamaterial with a negative effective index of refraction is made from a three-dimensional hexagonal lattice photonic crystal with a metallic basis embedded in foam. It has been simulated with Ansoft HFSSTM in a frequency range from 7.0 to 12.0 GHz. Simulated results tested experimentally and negative refraction verified in some frequencies. Experimental results are in excellent agreement with simulations.
Eruptions from coronal hole bright points: observations and non-potential modelling
Creators: name: Madjarska, Maria S.
name: Galsgaard, Klaus
name: Mackay, Duncan H.
name: Koleva, Kostadinka
name: Dechev, Momchil
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A single case study of a CBP in an equatorial coronal hole with an exceptionally large size is investigated to extend our understanding of the formation of mini-filaments, their destabilisation and the origin of the eruption triggering the formation of jet-like features recorded in the extreme-ultraviolet (EUV) and X-ray emission. We aim to explore the nature of the so-called micro-flares in CBPs associated with jets in coronal holes and mini coronal mass ejections in the quiet Sun. Co-observations from the Atmospheric Imaging Assembly (AIA) and Helioseismic Magnetic Imager (HMI) on board the Solar Dynamics Observatory, and GONG Halpha images are used together with a Non-Linear Force Free Field (NLFFF) relaxation approach, where the latter is based on a time series of HMI line-of-sight magnetograms. A mini-filament (MF) that formed beneath the CBP arcade around 3-4 h before the eruption is seen in the Halpha and EUV AIA images to lift up and erupt triggering the formation of an X-ray jet. No significant photospheric magnetic flux concentration displacement (convergence) is observed and neither is magnetic flux cancellation between the two main magnetic polarities forming the CBP in the time period leading to the MF liftoff. The CBP micro-flare is associated with three flare kernels that formed shortly after the MF liftoff. No observational signature is found for reconnection beneath the erupting MF. The applied NLFFF modelling successfully reproduces both the CBP loop complex as well as the magnetic flux rope that hosts the MF during the build-up to the eruption.
description: 13 pages, 11 figures, the abstract has been reduced from its original length, accepted by A&A
Ceanocholax fenyesi Pierce 1909, sensu lato
Creators: name: Tocora, María Camila
name: Fiorentino, Gianpiero
name: Fernández, Fernando
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Strepsiptera
Mengenillidae
Ceanocholax
Ceanocholax fenyesi

description: Ceanocholax fenyesi sensu lato Pierce, 1909
Figures 1 & 2
 Material examined. 1 male, Colombia, Nariño, Barbacoas, Altaquer. Río Ñambí. 10.XI. 2010. 1440 m., emerging from gaster of the ant Megalomyrmex cyendyra (Formicidae), Col. E. Flórez, Leg. [ICN: 100121]. 1 male, Colombia, Santander. Puerto Parra, Campo Capote. 10.III.2008. Malaise 3. Borojó crop. Col. Sistemática Animal [ICN: 100122]. 1 male, Colombia, Putumayo, Mocoa, Vda. Pueblo Viejo, Fca. la Locha, 1– 4. iii. 2016. [ICN: 100151]. 1 male, Colombia, Risaralda, Pueblo Rico, Montezuma Ecolodge, 5,9 km WbN de Pueblo Rico, 5,230 16 N, 76,083 64 W, 1336 m, 12– 15.ix. 2017, D. Forero. [MPUJ: 0058345]. 1 male, Colombia, Boyacá, Santa María, Sendera Hyca Quye, 5,5 Km NW de Santa María, 4.89811 N, 73.29344 W, 900m, 7–11.iii.2016. C. Pinilla [MPUJ: 0044666]. 1 male, Colombia, Meta, San Martín, Reserva Natural el Caduceo, Km 4,5 vía San Francisco, 3.665533 N, 73.658316 W, 309m, 10–14.iii.2014, J. Cajiao. [MPUJ: 0039551]. 1 male, Colombia, Guaviare, San José del Guaviare, Vda. Playa Guio, Sendero los Puentes, 2.570556 N, - 72.701111 W, 180 m, 14–21.iv.2013, Col. Sistemàtica Animal [ICN: 100145]
description: Published as part of Tocora, María Camila, Fiorentino, Gianpiero & Fernández, Fernando, 2020, Strepsiptera from Colombia: First record of the genus Strichotrema Hofeneder (Myrmecolacidae) and a new host-parasitoid association with Megalomyrmex cyendyra (Hymenoptera: Formicidae), pp. 266-274 in Zootaxa 4728 (2) on pages 267-268, DOI: 10.11646/zootaxa.4728.2.7, http://zenodo.org/record/3621185
A Semi-Analytical Approach to Model Drilling Fluid Leakage Into Fractured Formation
Creators: name: Albattat, Rami
name: Hoteit, Hussein
Publisher: name: arXiv
Year: 2020
Subjects: subject: Geophysics (physics.geo-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Loss of circulation while drilling is a challenging problem that may interrupt operations, reduce efficiency, and may contaminate the subsurface. When a drilled borehole intercepts conductive faults or fractures, lost circulation manifests as a partial or total escape of drilling, workover, or cementing fluids, into the surrounding rock formations. Loss control materials (LCM) are often used in the mitigation process. Understanding the fracture effective hydraulic properties and fluid leakage behavior is crucial to mitigate this problem. Analytical modeling of fluid flow in fractures is a tool that can be quickly deployed to assess lost circulation and perform diagnostics, including leakage rate decline, effective fracture conductivity, and selection of the LCM. Such models should be applicable to Newtonian and non-Newtonian yield-stress fluids, where the fluid rheology is a nonlinear function of fluid flow and shear stress. In this work, a new semi-analytical solution is developed to model the flow of non-Newtonian drilling fluid in a fractured medium. The solution model is applicable for various fluid types exhibiting yield-power-law (Herschel-Bulkley). We use high-resolution finite-element simulations based on the Cauchy equation to verify our solutions. We also generate type-curves and compare them to others in the literature. We demonstrate the applicability of the proposed model for two field cases encountering lost circulations. To address the subsurface uncertainty, we combine the developed solutions with Monte-Carlo and generate probabilistic predictions. The solution method can estimate the range of fracture conductivity, parametrized by the fracture hydraulic aperture, and time-dependent fluid loss rate that can predict the cumulative volume of lost fluid. The proposed approach is accurate and efficient enough to support decision-making for real-time drilling operations.
description: 31 pages, 16 figures. Rheol Acta (2021)
Non-Equilibrium Beta Processes in Neutron Stars: A Relationship between the Net Reaction Rate and the Total Emissivity of Neutrinos
Creators: name: Flores-Tulian, Sergio
name: Reisenegger, Andreas
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Several different processes could be changing the density in the core of a neutron star, leading to a departure from $β$ equilibrium, quantified by the chemical potential difference $δμ\equivμ_n-μ_p-μ_e$. The evolution of this quantity is coupled to that of the star's interior temperature $T$ by two functions that quantify the rate at which neutrino-emitting reactions proceed: the net reaction rate (difference between $β$ decay and capture rates), $Γ_{\rm net}(T,δμ)$, and the total emissivity (total energy emission rate in the form of neutrinos and antineutrinos), $ε_{\rm tot}(T,δμ)$. Here, we present a simple and general relationship between these variables, ${\partialε_{\rm tot}/\partialδμ=3Γ_{\rm net}}$, and show that it holds even in the case of superfluid nucleons. This relation may simplify the numerical calculation of these quantities, including superfluid reduction factors.
description: Accepted for publication in MNRAS. 8 pages, non tables nor figures, uses aastex.cls
Black Holes, Black Rings and their Microstates
Creators: name: Bena, Iosif
name: Warner, Nicholas P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this review article we describe some of the recent progress towards the construction and analysis of three-charge configurations in string theory and supergravity. We begin by describing the Born-Infeld construction of three-charge supertubes with two dipole charges, and then discuss the general method of constructing three-charge solutions in five dimensions. We explain in detail the use of these methods to construct black rings, black holes, as well as smooth microstate geometries with black hole and black ring charges, but with no horizon. We present arguments that many of these microstate geometries are dual to boundary states that belong to the same sector of the D1-D5-P CFT as the typical states. We end with an extended discussion of the implications of this work for the physics of black holes in string theory.
description: 96 pages, 10 figures, 17 exercises, LaTeX. Review article based on lectures presented at the Winter School on the Attractor Mechanism (Frascati, March 20-24, 2006). v2. Improved discussion of smoothness and regularity of microstate geometries. References added
Strichoterma beckeri Oliveira & Kogan 1959
Creators: name: Tocora, María Camila
name: Fiorentino, Gianpiero
name: Fernández, Fernando
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Formicidae
Strichoterma
Strichoterma beckeri

description: Strichoterma beckeri Oliveira & Kogan, 1959
Figure 3
 Caenocholax beckeri Oliveira & Kogan 1959: 224. Type locality: Rio de Janeiro, Brazil.
 Caenocholax wygodzinskyi Oliveira & Kogan 1959: 225. Type locality: Rio de Janeiro, Brazil.
 Material examined. 1 male, Colombia, Nariño, Tumaco, Sede UN. 9– 11. IX. 2016. Malaise. Col. Taxonomía Animal, 2016 (II). [ICN: 100123]. 1 male, Colombia, Meta, San Martín, Reserva Natural El Caduceo, Km 4,5 vía San Francisco, 3.665533 N, 73.658316 W, 309m, 10– 14. iii. 2014, J. Cajiao. [MPUJ: 0039551].
description: Published as part of Tocora, María Camila, Fiorentino, Gianpiero & Fernández, Fernando, 2020, Strepsiptera from Colombia: First record of the genus Strichotrema Hofeneder (Myrmecolacidae) and a new host-parasitoid association with Megalomyrmex cyendyra (Hymenoptera: Formicidae), pp. 266-274 in Zootaxa 4728 (2) on page 269, DOI: 10.11646/zootaxa.4728.2.7, http://zenodo.org/record/3621185
Gravitino Production from Heavy Moduli Decay and Cosmological Moduli Problem Revived
Creators: name: Nakamura, Shuntaro
name: Yamaguchi, Masahiro
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The cosmological moduli problem for relatively heavy moduli fields is reinvestigated. For this purpose we examine the decay of a modulus field at a quantitative level. The modulus dominantly decays into gauge bosons and gauginos, provided that the couplings among them are not suppressed in the gauge kinetic function. Remarkably the modulus decay into a gravitino pair is unsuppressed generically, with a typical branching ratio of order 0.01. Such a large gravitino yield after the modulus decay causes cosmological difficulties. The constraint from the big-bang nucleosynthesis pushes up the gravitino mass above 10^5 GeV. Furthermore to avoid the over-abundance of the stable neutralino lightest superparticles (LSPs), the gravitino must weigh more than about 10^6 GeV for the wino-like LSP, and even more for other neutralino LSPs. This poses a stringent constraint on model building of low-energy supersymmetry.
description: 14 pages, 1 figure; minor corrections
The Co-Formation of Spheroids and Quasars Traced in their Clustering
Creators: name: Hopkins, Philip F.
name: Lidz, Adam
name: Hernquist, Lars
name: Coil, Alison L.
name: Myers, Adam D.
name: Cox, Thomas J.
name: Spergel, David N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We compare observed clustering of quasars and galaxies as a function of redshift, mass, luminosity, & color/morphology, to constrain models of quasar fueling and spheroid-BH co-evolution. High redshift quasars are shown to be drawn from progenitors of local early-type galaxies, with the characteristic quasar luminosity L* reflecting a characteristic mass of 'active' BH/host populations at each redshift. Evolving observed high-z quasar clustering to z=0 predicts a trend of clustering in 'quasar remnants' as a function of stellar mass identical to that observed for early-types. However, quasar clustering does not simply reflect observed early (or late)-type populations; at each redshift, quasars cluster as an 'intermediate' population. Comparing with the age of elliptical stellar populations reveals that this 'intermediate' population represents those ellipticals undergoing or terminating their final significant star formation at each epoch. Assuming that quasar triggering is associated with the formation/termination epoch of ellipticals predicts quasar clustering at all observed redshifts without any model dependence or assumptions about quasar light curves, lifetimes, or accretion rates. This is not true for disks or quasar halos: i.e. quasars do not generically trace star formation, disks, or halo assembly. Quasar clustering at all z is consistent with a constant halo mass ~4x10^{12} M_sun, similar to local 'group scales.' The observations support a scenario in which major mergers trigger quasar activity and dominate bright, high-z quasar populations. We show that measurements of quasar clustering versus luminosity at z~1 can be used to constrain different lower-luminosity AGN fueling mechanisms, and that high-z clustering is sensitive to whether or not systems 'shut down' growth at z>3.
description: 21 pages, 14 figures. Accepted to ApJ. Minor revisions to match published version
B \to 0^{+}(1^{+}) + missing energy in Unparticle Physics
Creators: name: Aslam, M. Jamil
name: Lu, Cai-Dian
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We examine the effects of an unparticle $\mathcal{U}$ as a possible source of missing energy in the p-wave decays of $B$ meson. The dependence of the differential branching ratio on the $K_{0}^{\ast}(K_{1}) -$% meson's energy is discussed in the presence of scalar and vector unparticle operators and significant deviation from the standard model value is found after addition of these operators. Finally, we have shown the dependence of branching ratio for the above said decays on the parameters of the unparticle stuff like the effective couplings, cutoff scale $Λ_{% \mathcal{U}}$ and the scale dimensions $d_{\mathcal{U}}$.
description: 16 pages, 6 figures
ATM-based wireless personal communications services (PCS) over cable television (CATV) network
Creators: name: Er, Wee Liat
Publisher: name: University of British Columbia
Year: 2009

description: Personal Communications Systems (PCS) is a rapidly growing and important segment of the telecommunications industry. The ultimate goal of PCS is to provide a wide range of integrated wireless and wireline services, such as voice, data, video, and imaging etc., in one universal Personal Communications Network (PCN). We consider using the Cable Television (CATV) network as a communications network backbone to provide transport for ATM based Wireless PCS traffic, as one of the alternatives to network architecture choices. The objective is to achieve medium sharing of existing networks and hence conserve capital while providing minimum interruption to the ongoing services. The suitable signaling architecture for the proposed CATV/PSTN overlay is presented. A distributed communications architecture (DCPA/ASEs approach) is discussed and compared to the traditional centralized network and control (CP/B-ISUP approach) architecture. Call setup and handoff delay encountered in the proposed CATV/PCN overlay using these two schemes are compared. The network performances of the design model, such as the ATM end-to-end delay, AAL end-to-end delay, buffer requirement, cell access delay and cell loss are also investigated in this research work. Simulation models, consisting of 1 and 3 distributing centers (DC), each with 15 distributing points (DP), have been constructed for study. Network delay, throughput, capacity and coverage of the CATV/PCN overlay under various traffic loading situations are estimated. Finally, in order to support the ever increase demand for mobile communications, distributed antennas are considered to provide coverage enhancement in a simulcast arrangement.
A Minimum Energy Filter for Localisation of an Unmanned Aerial Vehicle
Creators: name: Henderson, Jack
name: Zamani, Mohammad
name: Mahony, Robert
name: Trumpf, Jochen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: Robotics (cs.RO)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Accurate localisation of unmanned aerial vehicles is vital for the next generation of automation tasks. This paper proposes a minimum energy filter for velocity-aided pose estimation on the extended special Euclidean group. The approach taken exploits the Lie-group symmetry of the problem to combine Inertial Measurement Unit (IMU) sensor output with landmark measurements into a robust and high performance state estimate. We propose an asynchronous discrete-time implementation to fuse high bandwidth IMU with low bandwidth discrete-time landmark measurements typical of real-world scenarios. The filter's performance is demonstrated by simulation.
description: To be presented at the 59th IEEE Conference on Decision and Control (CDC), 14-18 December 2020
High energy neutrino astronomy using upward-going muons in Super-Kamiokande-I
Creators: name: Kamiokande Collaboration
name: Abe, K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present the results from several studies used to search for astrophysical sources of high-energy neutrinos using the Super-Kamiokande-I (April 1996 to July 2001) neutrino-induced upward-going muon data. The data set consists of 2359 events with minimum energy 1.6 GeV, of which 1892 are through-going and 467 stop within the detector. The results of several independent analyses are presented, including searches for point sources using directional and temporal information and a search for signatures of cosmic-ray interactions with the interstellar medium in the upward-going muons. No statistically significant evidence for point sources or any diffuse flux from the plane of the galaxy was found, so specific limits on fluxes from likely point sources are calculated. The 90% C.L. upper limits on upward-going muon flux from astronomical sources which are located in the southern hemisphere and always under the horizon for Super-Kamiokande are 1~4x10^{-15} cm^{-2} s^{-1}.
description: 8 pages, 6 figures, submitted to ApJ v2 clarifies angular cone sizes used in response to referee comments. Please send comments, clarifications, etc. to Alec Habig (ahabig@umn.edu)
Halictophagidae Perkins 1905
Creators: name: Tocora, María Camila
name: Fiorentino, Gianpiero
name: Fernández, Fernando
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Strepsiptera
Halictophagidae

description: Halictophagidae sp.  Figure 4
 Material examined. A female Halictophagidae from Colombia, Tolima, Mpio. Cunday, vereda el Edén, Rastrojo, 430m, 20.iii. 1999, Manual, parasitic in an unidentified Ceresini (Hemiptera: Membracidae). GAVA leg. [MPUJ:0064817]
description: Published as part of Tocora, María Camila, Fiorentino, Gianpiero & Fernández, Fernando, 2020, Strepsiptera from Colombia: First record of the genus Strichotrema Hofeneder (Myrmecolacidae) and a new host-parasitoid association with Megalomyrmex cyendyra (Hymenoptera: Formicidae), pp. 266-274 in Zootaxa 4728 (2) on page 269, DOI: 10.11646/zootaxa.4728.2.7, http://zenodo.org/record/3621185
A dual adaptive explicit time integration algorithm for efficiently solving the cardiac monodomain equation
Creators: name: Mountris, Konstantinos A
name: Pueyo, Esther
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: The monodomain model is widely used in in-silico cardiology to describe excitation propagation in the myocardium. Frequently, operator splitting is used to decouple the stiff reaction term and the diffusion term in the monodomain model so that they can be solved separately. Commonly, the diffusion term is solved implicitly with a large time step while the reaction term is solved by using an explicit method with adaptive time stepping. In this work, we propose a fully explicit method for the solution of the decoupled monodomain model. In contrast to semi-implicit methods, fully explicit methods present lower memory footprint and higher scalability. However, such methods are only conditionally stable. We overcome the conditional stability limitation by proposing a dual adaptive explicit method in which adaptive time integration is applied for the solution of both the reaction and diffusion terms. In a set of numerical examples where cardiac propagation is simulated under physiological and pathophysiological conditions, results show that our proposed method presents preserved accuracy and improved computational efficiency as compared to standard operator splitting-based methods.
description: 11 pages, 5 figures, 1 table. Paper under review in International Journal for Numerical Methods in Engineering
The globular cluster NGC 1978 in the Large Magellanic Cloud
Creators: name: Mucciarelli, Alessio
name: Ferraro, Francesco R.
name: Origlia, Livia
name: Pecci, Flavio Fusi
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have used deep high-resolution Hubble Space Telescope ACS observations to image the cluster NGC 1978 in the Large Magellanic Cloud. This high-quality photometric data set allowed us to confirm the high ellipticity (~0.30+-0.02) of this stellar system. The derived Color Magnitude Diagram allowed a detailed study of the main evolutionary sequences: in particular we have detected the so called Bump along the Red Giant Branch (at V_{555}=19.10+-0.10). This is the first detection of this feature in an intermediate-age cluster. Moreover the morphology of the evolutionary sequence and their population ratios have been compared with the expectations of different theoretical models (namely BaSTI, PEL and Padua) in order to quantify the effect of convective overshooting. The best agreement (both in terms of morphology and star counts) has been found the PEL (Pisa Evolutionary Library) isochrone with Z=0.008 (consistenly with the most recent determination of the cluster metallicity, [M/H]=-0.37 dex) and a mild overshooting efficiency (Lambda_{os}=0.1). By adopting this theoretical set an age of 1.9+-0.1 Gyr has been obtained.
description: 26 pages, 8 figures, accepted to AJ
Kozai Migration Naturally Explains the White Dwarf Planet WD1856b
Creators: name: Muñoz, Diego J.
name: Petrovich, Cristobal
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The Jovian-sized object WD~1856~b transits a white dwarf (WD) in a compact $1.4$-day orbit. Unlikely to have endured stellar evolution in its current orbit, WD~1856~b is thought to have migrated from much wider separations. Because the WD is old, and a member of a well-characterized hierarchical multiple, the well-known Kozai mechanism provides an effective migration channel for WD~1856~b. Moreover, the lack of tides in the star allows us to directly connect the current semi-major axis to the pre-migration one, from which we can infer the initial conditions of the system. By further demanding that successful migrators survive all previous phases of stellar evolution, we are able to constrain the mass of WD~1856~b to be $\simeq0.7-3M_{\rm J}$ and its main sequence semi-major axis to be $\simeq 2-2.5$ au. These properties imply that WD~1856~b was born a typical gas giant. We further estimate the occurrence rate of Kozai-migrated planets around WDs to be ${\cal O}(10^{-3}{-}10^{-4})$, suggesting that WD~1856~b is the only one in the {\it TESS} sample, but implying ${\cal O}(10^2)$ future detections by LSST. In a sense, WD~1856~b was an ordinary Jovian planet that underwent an extraordinary dynamical history.
description: 9 pages, 5 figuress (submitted)
Exclusive B-> K_{1}l ^{+}l ^{-} decay in model with single universal extra dimension
Creators: name: Ahmed, Ishtiaq
name: Paracha, M. Ali
name: Aslam, M. Jamil
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Decay rate and forward-backward asymmetries in B -> K_{1} l^{+} l ^{-}, K_{1} is the axial vector meson, are calculated in the universal extra dimension (UED) model. The dependence of these physical quantities on the compactification radius $R$, the only unknown parameter in UED model, is studied and it is shown that zero of forward-backward asymmetry is sensitive to the UED model, therefore they can be very useful tool to establish new physics predicted by the UED model. This work is briefly extended to B -> K^{*}l^{+}l^{-}.
description: 19 pages, 4 figures
Assignment Flow for Order-Constrained OCT Segmentation
Creators: name: Sitenko, D.
name: Boll, B.
name: Schnörr, C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: At the present time Optical Coherence Tomography (OCT) is among the most commonly used non-invasive imaging methods for the acquisition of large volumetric scans of human retinal tissues and vasculature. To resolve decisive information from extracted OCT volumes and to make it applicable for further diagnostic analysis, the exact identification of retinal layer thicknesses serves as an essential task be done for each patient separately. However, the manual examination of multiple OCT scans in a row is a demanding and time consuming task, which results in a lengthy qualification process and is frequently confounded in the presence of tissue-dependent speckle noise. Therefore, the elaboration of automated segmentation models has become an important task in the field of medical image processing. We propose a novel, purely data driven \textit{geometric approach to order-constrained 3D OCT retinal cell layer segmentation} which takes as input data in any metric space and comes along with basic operations that can be effectively computed in parallel. As opposed to many established retina detection methods, our presented formulation avoids the use of any shape prior and accomplishes the natural order of the retina in a purely geometric way. This makes the approach unbiased and hence suited for the detection of local anatomical changes of retinal tissue structure. To demonstrate robustness of the proposed approach, we compare two different choices of features on a data set of manually annotated 3D OCT volumes of healthy human retina. The quality of computed segmentations is compared to the state of the art in terms of mean absolute error and the Dice similarity coefficient. The results indicate a great potential for applying our method to the classification of diseased retina and opens a new research direction regarding the joint segmentation of retinal cell layers and blood vessel structures.
Novel Time Division Duplex Schemes
Creators: name: GHERMEZCHESHMEH, MOJTABA
Publisher: name: Monash University
Year: 2024
Subjects: classificationCode: 400608
subject: Wireless communication systems and technologies (incl. microwave and millimetrewave)

description: This study investigates the benefits of time division duplex (TDD) and intelligent reflecting surfaces (IRSs) in next-generation wireless communication systems. The first part focuses on combining centralized dynamic-TDD with interference alignment (IA) to optimize performance in a wireless network. The proposed scheme achieves significant gains over existing methods. The second part addresses channel estimation in holographic massive MIMO systems, proposing a channel estimation scheme that outperforms benchmark methods in a poor scattering environment. Lastly, the study proposes a localization scheme utilizing multiple intelligent reflecting surfaces (IRSs) and a parametric physical channel model, demonstrating accurate localization in a challenging environment.
Chandra Observations of Galactic Center: High Energy Processes at Arcsecond Resolution
Creators: name: Wang, Q. Daniel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: About 2 million seconds of Chandra observing time have been devoted to the Galactic center (GC), including large-scale surveys and deep pointings. These observations have led to the detection of about 4000 discrete X-ray sources and the mapping of diffuse X-ray emission in various energy bands. In this review, I first summarize general results from recent studies and then present close-up views of the three massive star clusters (Arches, Quintuplet, and GC) and their interplay with the Galactic nuclear environment.
description: 10 pages, an invited talk presented in the GC2006 workshop, high-resolution version available at http://www.astro.umass.edu/~wqd/papers/arches/gc2006.pdf
Hydrodynamic limit of a coupled Cucker-Smale system with strong and weak internal variable relaxation
Creators: name: Kim, Jeongho
name: Poyato, David
name: Soler, Juan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 92D25, 74A25, 76N10

description: In this paper, we present the hydrodynamic limit of a multiscale system describing the dynamics of two populations of agents with alignment interactions and the effect of an internal variable. It consists of a kinetic equation coupled with an Euler-type equation inspired by the thermomechanical Cucker--Smale (TCS) model. We propose a novel drag force for the fluid-particle interaction reminiscent of Stokes' law. Whilst the macroscopic species is regarded as a self-organized background fluid that affects the kinetic species, the latter is assumed sparse and does not affect the macroscopic dynamics. We propose two hyperbolic scalings, in terms of a strong and weak relaxation regime of the internal variable towards the background population. Under each regime, we prove the rigorous hydrodynamic limit towards a coupled system composed of two Euler-type equations. Inertial effects of momentum and internal variable in the kinetic species disappear for strong relaxation, whereas a nontrivial dynamics for the internal variable appears for weak relaxation. Our analysis covers both the case of Lipschitz and weakly singular influence functions
description: 63 pages, 10 figures
Multiple objective control with applications to teleoperation
Creators: name: Hu, Zhongzhi
Publisher: name: University of British Columbia
Year: 2009

description: Control system design inevitably involves tradeoffs among different and even conflicting performance and robustness specifications. This thesis deals with some multiple objective control system design problems and with applications to teleoperation systems. First, the multiple objective linear-quadratic optimal control problem is solved. By using duality theory, this minimax problem is transformed into a convex optimization problem . In particular, the infinite time problem is shown to be an optimization problem involving linear matrix inequalities. Second, the multiple objective Hoo control problem for SISO systems is studied. Nonsmooth analysis is used to characterize optimality conditions for this problem. Under these conditions, either all-pass properties or the optimal performance values are obtained. Third, numerical solutions of the general multiple objective control system design problem by either convex optimization or non-convex optimization are presented. First, the convex optimization design procedure is described, the effectiveness of the cutting-plane based solver is demonstrated, and some computational issues are discussed. Then a non-convex optimization design procedure is proposed, in which an approximation to the free transfer function in the Q-parametrization is proposed. It is shown, by design examples, that it has the advantage of directly producing low-order controllers. Last, the robust controller design problem for teleoperation systems is investigated. First, a two-port ideal teleoperation model is proposed. It is shown that the model scales both positions and forces, yet is stable when terminated by any strictly passive hand and environment impedances. Then a transparency measure is proposed to be defined as the Hoo-distance to the ideal teleoperator model. Using a four channel control structure, the controller design problem is formulated as a multiobjective optimization problem maximizing transparency subject to robust stability for all passive environments. This problem is shown to be convex in the design parameters for a fixed hand impedance. To demonstrate the design procedure, this thesis treats the design of a controller for a simple one degree-of-freedom system model of a motion-scaling teleoperation system. Both simulations and experiments have been carried out to show the effectiveness of the proposed controller design methodology.
Obesity, palmitate, and senescence : investigating the role of fibroblasts in breast cancer progression
Creators: name: Harlow, Brittany Susanne
name: 0000-0001-7806-1071
Publisher: name: The University of Texas at Austin
Year: 2023
Subjects: Breast cancer
Obesity
Senescence

description: Obese breast cancer patients suffer a worse prognosis than their normoweight counterparts, including increased risks of recurrence and mortality. While the causative mechanisms remain to be fully uncovered, emerging evidence implicates the obesity-related factor palmitate in development of cellular senescence, an inflammatory state associated with proliferation, metastasis, and other hallmarks of cancer. To investigate the obesity-senescence axis, we utilized in vitro models in which palmitate or sera from non-obese or obese women were applied to fibroblasts, the most populous stromal cell type found in the breast tumor microenvironment, after which the cells were assessed for onset of senescence. Indirect co-culture was then used to assess the impact of these obesity- and palmitate-exposed fibroblasts on multiple breast cancer cell lines. Involvement of NF-κB was investigated using a pharmacological inhibitor, and the polyunsaturated omega-3 fatty acids EPA and DHA were tested as potential therapeutic agents. Obese conditions and palmitate exposure induced a senescent-like phenotype in fibroblasts, characterized by such measures as a proliferative arrest, senescence-associated beta-galactosidase activity, and pro-inflammatory gene and protein expression. The mechanism establishing senescent-like gene expression relied at least partially on NF-κB activity. While these effects were not abrogated by concurrent omega-3 fatty acid administration, the fibroblast phenotype induced by obese conditions and palmitate appeared of pathological significance, inducing cell non-autonomous effects in breast cancer cells. Specifically, senescent-like, palmitate-exposed fibroblasts imparted changes in tumorigenic measures, including cell viability, migration, and gene expression signatures related to EMT, angiogenesis, metabolism, cell cycle, and DNA damage repair. These studies are among the first to implicate the pathogenicity of palmitate-induced fibroblast senescence in the context of breast cancer. In informing our understanding of the connection between palmitate, senescence, and breast tumorigenesis, these studies will ultimately facilitate identification of a therapeutic target that can be used to improve the comparably worse outcomes of the obese breast cancer patient.
Spectrum efficiency optimization in cellular packet data communication
Creators: name: Chong, Peter H. J.
Publisher: name: University of British Columbia
Year: 2009

description: In most studies on the effect of co-channel interferers, the interference is assumed to be Gaussian. In this thesis, a more realistic simulation model of multiple co-channel interferers in a cellular packet data communication system using non-coherent frequency shift keying modulation is developed for a non-fading and a fading environment. The performance of the packet data traffic as the number of co-channel interferers increases is investigated in terms of BER and BKER results obtained from the simulation. Other parameters studied are block length, propagation loss exponent, fading rate and background noise level. It is found that as the number of interferers increases, error rates increase except for the BER in slow Rayleigh fading which tends to be independent of the number of interferers. Eventually, the effect of the interference signal can be regarded as similar to that of Gaussian noise. The spectrum efficiency with different system configurations and parameters is obtained by assuming that the mobile is located near the cell boundary. The influence of the cluster size on spectrum efficiency is investigated. The optimal value, Kopt, of the cluster size is found. In an interference-limited environment, the spectrum efficiency tends to increase with the propagation loss exponent because of the improved SIR value. It is found that the optimal spectrum efficiency can be greatly increased with the use of directional antennas. In most non-fading and very slow fading cases considered, Kopt is typically less than 7. However, Kopt increases with the fading rate. Generally, measures such as FEC taken to counteract the effects of the interference result in a smaller value of Kopt. However, FEC does not necessarily improve the spectrum efficiency.
Empirical test for relativistic kinetic theories based on the Sunyaev-Zel'dovich effect
Creators: name: Molnar, Sandor M.
name: Godfrey, Joseph
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We propose a new method to determine the electron velocity (EV) distribution function in the intracluster gas (ICG) in clusters of galaxies based on the frequency dependence of the Sunyaev-Zel'dovich (SZ) effect. It is generally accepted that the relativistic equilibrium EV distribution is the one suggested by Juttner. However, there is an ongoing debate on the foundation of relativistic kinetic theory, and other distributions have also been proposed. The mildly relativistic intracluster gas (ICG) provides a unique laboratory to test relativistic kinetic theories. We carried out Monte Carlo simulations to generate SZ signal from a single-temperature gas assuming the Juttner EV distribution assuming a few per cent errors. We fitted SZ models based on non-relativistic Maxwellian, and its two relativistic generalizations, the Juttner and modified Juttner distributions. We found that a 1% error in the SZ signal is sufficient to distinguish between these distributions with high significance based on their different best-fit temperatures. However, in any LOS in a cluster, the ICG contains a range of temperatures. Using our N-body/hydrodynamical simulation of a merging galaxy cluster and assuming a 1% error in the SZ measurements in a LOS through a bow shock, we find that it is possible to distinguish between Juttner and modified Juttner distributions with high significance. Our results suggest that deriving ICG temperatures from fitting to SZ data assuming different EV distribution functions and comparing them to the temperature in the same cluster obtained using other observations would enable us to distinguish between the different distributions.11 pages, 8 figures, and 1 table, accepted for publication in the Astrophysical Journal
description: 11 pages, 8 figures, and 1 table, accepted for publication in the Astrophysical Journal
An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
Creators: name: Baker, C. A.
name: Doyle, D. D.
name: Geltenbort, P.
name: Green, K.
name: van der Grinten, M. G. D.
name: Harris, P. G.
name: Iaydjiev, P.
name: Ivanov, S. N.
name: May, D. J. R.
name: Pendlebury, J. M.
name: Richardson, J. D.
name: Shiers, D.
name: Smith, K. F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: An experimental search for an electric-dipole moment (EDM) of the neutron has been carried out at the Institut Laue-Langevin (ILL), Grenoble. Spurious signals from magnetic-field fluctuations were reduced to insignificance by the use of a cohabiting atomic-mercury magnetometer. Systematic uncertainties, including geometric-phase-induced false EDMs, have been carefully studied. Two independent approaches to the analysis have been adopted. The overall results may be interpreted as an upper limit on the absolute value of the neutron EDM of |d_n| < 2.9 x 10^{-26} e cm (90% CL).
description: 5 pages, 2 figures. The published PRL is slightly more terse (e.g. no section headings) than this version, due to space constraints. Note a small correction-to-a-correction led to an adjustment of the final limit from 3.0 to 2.9 E-26 e.cm compared to the first version of this preprint
An Early-Stopping Mechanism for DSCF Decoding of Polar Codes
Creators: name: Sagitov, Ilshat
name: Giard, Pascal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Polar codes can be decoded with the low-complexity successive-cancellation flip (SCF) algorithm. To improve error-correction performance, the dynamic successive-cancellation flip (DSCF) variant was proposed, where the resulting error-correction performance is similar to that of the successive-cancellation list algorithm with low to moderate list sizes. Regardless of the variant, the SCF algorithm exhibits a variable execution time with a high (worst-case) latency. In this work, we propose an early-stopping metric used to detect codewords that are likely undecodable such that the decoder can be stopped at earlier stages for those codewords. We then propose a modified version of the DSCF algorithm that integrates our early-stopping metric that exploits the specific properties of DSCF. Compared to the original DSCF algorithm, in the region of interest for wireless communications, simulation results show that our proposed modifications can lead to reductions of 22% to the average execution time and of 45% to the execution-time variance at the cost of a minor error-correction loss of approximately 0.05 dB.
description: 6 pages, presented at IEEE SiPS 2020
The anisotropic flow coefficients $v_2$ and $v_4$ in Au+Au collisions at RHIC
Creators: name: Bai, Yuting
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present measurements by STAR of the anisotropic flow coefficients $v_2$ and $v_4$ as a function of particle-type, centrality, transverse momentum and pseudorapidity in Au+Au collisions at RHIC.
description: 4 pages, 4 figures, talk presented at Quark Matter 2006