cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Exploring high-frequency eddy-current testing for sub-aperture defect characterisation using parametric-manifold mapping
Creators: name: Hughes, Robert R.
name: Drinkwater, Bruce W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Accurate characterisation of small defects remains a challenge in non-destructive testing (NDT). In this paper, a principle-component parametric-manifold mapping approach is applied to single-frequency eddy-current defect characterisation problems for surface breaking defects in a planar half-space. A broad 1-8 MHz frequency-range FE-circuit model & calibration approach is developed & validated to simulate eddy-current scans of surface-breaking notch defects. This model is used to generate parametric defect databases for surface breaking defects in an aluminium planar half-space and defect characterisation of experimental measurements performed. Parametric-manifold mapping was conducted in N-dimensional principle component space, reducing the dimensionality of the characterisation problem. In a study characterising slot depth, the model & characterisation approach is shown to accurately invert the depth with greater accuracy than a simple amplitude inversion method with normalised percentage characterisation errors of 38% and 17% respectively measured at 2.0 MHz across 5 slot depths between 0.26 - 2.15 mm. The approach is used to characterise the depth of a sloped slot demonstrating good accuracy up to ~2.0 mm in depth over a broad range of sub-resonance frequencies, indicating applications in geometric feature inversion. Finally the technique is applied to finite rectangular notch defects of surface extents smaller than the diameter of the inspection coil (sub-aperture) over a range of frequencies. The results highlight the limitations in characterising these defects and indicate how the inherent instabilities in resonance can severely limit characterisation at these frequencies.
description: 14 pages, 8 figures, research paper
Search for the pair production of scalar top quarks in the acoplanar charm jet topology in p pbar collisions at sqrt(s)=1.96 TeV
Creators: name: D0 Collaboration
name: Abazov, V. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A search for the pair production of scalar top quarks, or stops, has been performed in 360 pb-1 of data from p pbar collisions at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron collider. The stop decay mode considered is stop into c chi, where chi is the lightest supersymmetric particle. The topology analyzed therefore consists of a pair of acoplanar heavy-flavor jets with missing transverse energy. The data and standard model expectation are in agreement, and a 95% C.L. exclusion domain in the stop and chi mass plane has been determined, extending the domain excluded by previous experiments.
description: Minor modifications with respect to version 1
Tunable spin-valley coupling in layered polar Dirac metals
Creators: name: Kondo, Masaki
name: Ochi, Masayuki
name: Kojima, Tatsuhiro
name: Kurihara, Ryosuke
name: Sekine, Daiki
name: Matsubara, Masakazu
name: Miyake, Atsushi
name: Tokunaga, Masashi
name: Kuroki, Kazuhiko
name: Murakawa, Hiroshi
name: Hanasaki, Noriaki
name: Sakai, Hideaki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In non-centrosymmetric metals, spin-orbit coupling (SOC) induces momentum-dependent spin polarization at the Fermi surfaces. This is exemplified by the valley-contrasting spin polarization in monolayer transition metal dichalcogenides (TMDCs) with in-plane inversion asymmetry. However, the valley configuration of massive Dirac fermions in TMDCs is fixed by the graphene-like structure, which limits the variety of spin-valley coupling. Here, we show that the layered polar metal BaMn$X_2$ ($X =$Bi, Sb) hosts tunable spin-valley-coupled Dirac fermions, which originate from the distorted $X$ square net with in-plane lattice polarization. We found that in spite of the larger SOC, BaMnBi$_2$ has approximately one-tenth the lattice distortion of BaMnSb$_2$, from which a different configuration of spin-polarized Dirac valleys is theoretically predicted. This was experimentally observed as a clear difference in the Shubnikov-de Haas oscillation at high fields between the two materials. The chemically tunable spin-valley coupling in BaMn$X_2$ makes it a promising material for various spin-valleytronic devices.
description: 25 pages, 4 figures. Published in Communications Materials
New physics and the tau polarization vector in $b\to c τ\barν_τ$ decays
Creators: name: Penalva, N.
name: Hernández, E.
name: Nieves, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: For a general $H_b\to H_cτ\barν_τ$ decay we analyze the role of the $τ$ polarization vector ${\cal P}^μ$ in the context of lepton flavor universality violation studies. We use a general phenomenological approach that includes, in addition to the Standard Model (SM) contribution, vector, axial, scalar, pseudoscalar and tensor new physics (NP) terms which strength is governed by, complex in general, Wilson coefficients. We show that both in the laboratory frame, where the initial hadron is at rest, and in the center of mass of the two final leptons, a $\vec {\cal P}$ component perpendicular to the plane defined by the three-momenta of the final hadron and the $τ$ lepton is only possible for complex Wilson coefficients, being a clear signal for physics beyond the SM as well as time reversal (or CP-symmetry) violation. We make specific evaluations of the different polarization vector components for the $Λ_b\toΛ_c$, $\bar B_c\toη_c,J/ψ$ and $\bar B\to D^{(*)}$ semileptonic decays, and describe NP effects in the complete two-dimensional space associated with the independent kinematic variables on which the polarization vector depends. We find that the detailed study of ${\cal P}^μ$ has great potential to discriminate between different NP scenarios for $0^-\to 0^-$ decays, but also for $Λ_b \to Λ_c$ transitions. For this latter reaction, we pay special attention to corrections to the SM predictions derived from complex Wilson coefficients contributions.
description: 34 latex pages, 10 figures, 1 table. Enlarged and modified discussion. New references and one new figure added
MOESM1 of BMP3 suppresses colon tumorigenesis via ActRIIB/SMAD2-dependent and TAK1/JNK signaling pathways
Creators: name: Wen, Jialing
name: Liu, Xianglin
name: Qi, Yan
name: Niu, Feng
name: Niu, Zhitong
name: Geng, Wenjing
name: Zou, Zhaowei
name: Huang, Renli
name: Wang, Jianping
name: Zou, Hongzhi
Publisher: name: figshare
Year: 2019
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Genetics
subject: Molecular Biology
subject: Pharmacology
subject: Chemical Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences

description: Additional file 1. Materials and Methods.
Bellini, Giuseppe (2011). Idea de la mujer en la literatura hispanoamericana. De Coln al siglo XX. Roma: Bulzoni, pp. 207
Creators: name: Fiallega, Cristina
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2014

description:

description: Rassegna iberistica
Rancheri Allotment Memories (B-roll)
Creators: name: Girado, Luther
name: Hernandez, Betty
name: Hicks, Lucille
name: Grant, Laura
name: Turner, Julie
name: Durham, Kim
name: Everson, Merlene
name: Hammond, Jon
name: Turner, David
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: xaw

description: This file contains a discussion and recollection of memories from living on the Rancheri allotment. Some parts of the recording are less intelligible due to multiple speakers conversing at once. This b-roll contains further discussion and recollection of memories from living on the Rancheri allotment.
cmip_evaluation
Creators: name: Borato, Luana
name: Fetter Filho, Antonio Fernando Harter
name: Silva, Paula Gomes da
name: Mendez Incera, Fernando Javier
name: Klein, Antonio Henrique da Fontoura
Publisher: name: figshare
Year: 2021
Subjects: subject: Atmospheric Sciences
subject: FOS: Earth and related environmental sciences
subject: 40104 Climate Change Processes
subject: 40107 Meteorology

description: Climate change is expected to affect the frequency of regional atmospheric circulation patterns and, consequently, it will result in changes in meteorological and oceanographic conditions. Here, we present a dataset that consists of the frequency of the main atmospheric patterns (weather types) over the South Atlantic Ocean in the past and future. We used a reanalysis hindcast to identify 25 weather types representing the typical synoptic conditions in the region over the past 32 years. We verified the performance of the CMIP5 and CMIP6 projections on describing the frequency of these main weather types over the South Atlantic and assessed the potential changes in these frequencies in the future. The scenarios project variations of up to 3% in the frequency of some weather types over the 21st century. The data set and the performance analysis presented here can be used to support future statistical analysis, such as statistical downscaling experiments of oceanographic variables and studies on climate variations in the South Atlantic.
Meissner effect in honeycomb arrays of multi-walled carbon nanotubes
Creators: name: Murata, N.
name: Haruyama, J.
name: Ueda, Y.
name: Matsudaira, M.
name: Karino, H.
name: Yagi, Y.
name: Einarsson, E.
name: Chiashi, S.
name: Maruyama, S.
name: Sugai, T.
name: Kishi, N.
name: Shinohara, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report Meissner effect for type-II superconductors with a maximum Tc of 19 K, which is the highest value among those in new-carbon related superconductors, found in the honeycomb arrays of multi-walled CNTs (MWNTs). Drastic reduction of ferromagnetic catalyst and efficient growth of MWNTs by deoxidization of catalyst make the finding possible. The weak magnetic anisotropy, superconductive coherence length (- 7 nm), and disappearance of the Meissner effect after dissolving array structure indicate that the graphite structure of an MWNT and those intertube coupling in the honeycomb array are dominant factors for the mechanism.
description: 6 pages
"Captive Audience"? - Advertising messages in primary school textbooks
Creators: name: Farinha, Isabel
Publisher: name: Zenodo
Year: 2007
Subjects: subject: Advertising
subject: Advertising/ethics
subject: Media and communications
subject: FOS: Media and communications
subject: in-shool Marketing
subject: Media Exposure
subject: Communications Media
subject: Culture Media
subject: Media Exposure/education
subject: Media Exposure/ethics
subject: Media Exposure/standards
subject: Culture Media/standards
subject: Persuasive Communication

description:  

“Captive Audience”? - Advertising messages in primary school textbooks

In-school marketing is a form of advertising in the school space, tied to the role of the child in a consumer society (“Marketing in Schools”- Report on a study conducted for the European Commission. DG XXIV, October 1998). It is also linked with citizenship and consumers’ rights. My work focuses on the relationship between advertising images found in Portuguese primary school textbooks (Science and Maths) and product placement, a marketing tool and catalyst of the consumer sphere.

One strand of my research looks at the fit between the type of products/logos abounding in primary school textbooks and the target children (6 to 10 years), analysing the market share of the publishing industries involved. Another focus is the relationship between textbook activities/exercises and brand photographs. I also question the position of players directly or indirectly involved, illustrating the inherent paradoxes: What constitutes a commercial practice? Are advertising images harmful commercial influences or do they have a definite educational content? Are safeguards needed in a world of brands and globalised products? What role does the business sphere play in the world of school?
Forecasting Smog Clouds With Deep Learning
Creators: name: Oldenburg, Valentijn
name: Cardenas-Cartagena, Juan
name: Valdenegro-Toro, Matias
Publisher: name: arXiv
Year: 2024
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In this proof-of-concept study, we conduct multivariate timeseries forecasting for the concentrations of nitrogen dioxide (NO2), ozone (O3), and (fine) particulate matter (PM10 & PM2.5) with meteorological covariates between two locations using various deep learning models, with a focus on long short-term memory (LSTM) and gated recurrent unit (GRU) architectures. In particular, we propose an integrated, hierarchical model architecture inspired by air pollution dynamics and atmospheric science that employs multi-task learning and is benchmarked by unidirectional and fully-connected models. Results demonstrate that, above all, the hierarchical GRU proves itself as a competitive and efficient method for forecasting the concentration of smog-related pollutants.
Towards photoassociation processes of ultracold rubidium trimers
Creators: name: Schnabel, Jan
name: Kampschulte, Tobias
name: Rupp, Simon
name: Denschlag, Johannes Hecker
name: Köhn, Andreas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: We theoretically investigate the prospects for photoassociation (PA) of Rb$_3$, in particular at close range. We provide an overview of accessible states and possible transitions. The major focus is placed on the calculation of equilibrium structures, the survey of spin-orbit effects and the investigation of transition dipole moments. Furthermore we discuss Franck-Condon overlaps and special aspects of trimers including the (pseudo) Jahn-Teller effect and the resulting topology of adiabatic potential-energy surfaces. With this we identify concrete and suitable PA transitions to potentially produce long-lived trimer bound states. Calculations are performed using the multireference configuration-interaction method together with a large-core effective core potential and a core-polarization potential with a large uncontracted even-tempered basis set.
description: 15 pages, 8 figures, 3 tables; supporting info and underlying data as supplemental files
Group-velocity symmetry in photonic crystal fibre for ultra-tunable quantum frequency conversion
Creators: name: Parry, Charlotte
name: Main, Philip B.
name: Wright, Thomas A.
name: Mosley, Peter J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Low-noise frequency conversion of single photons is a critical tool in establishing fibre-based quantum networks. We show that a single photonic crystal fibre can achieve frequency conversion by Bragg-scattering four-wave mixing of source photons from an ultra-broad wavelength range by engineering a symmetric group velocity profile. Furthermore, we discuss how pump tuning can mitigate realistic discrepancies in device fabrication. This enables a single highly adaptable frequency conversion interface to link disparate nodes in a quantum network via the telecoms band.
description: 12 pages, 4 figures
Using Psychosocial Therapy to Improve the Quality of Life of Patients With Neurofibromatosis Type 1: A Review
Creators: name: Farahani, Farzam
Publisher: name: The University of Texas at Austin
Year: 2018
Subjects: neurofibromatosis
neurology
quality of life
psychosocial therapy

description: Neurofibromatosis Type 1 is an autosomal disorder of the central and peripheral nervous system and affects 1 in 3000 individuals. Patients with the disease have a significantly lower quality of life than the general population. Many manifestations of the disease contribute to this discrepancy, including anxiety, depression, learning disabilities, and cutaneous and plexiform neurofibromas. In addition, due to the number of complications that are present, patients need to visit their neuro-oncologists regularly in order to ensure that they are in good health. This only adds on to the quality of life discrepancy by making patients feel as if the disease is truly taking control of their lives. There is no current cure for Neurofibromatosis Type 1, so symptom relief is a priority for the time being. Through a literature review, this thesis assesses the state of current psychosocial therapy programs and research related to improving the quality of life of patients with Neurofibromatosis Type 1. Incorporation of therapies such as the Relaxation Response Therapy, the Acceptance and Commitment Therapy, and the Creative Arts therapy have shown to have a significant, positive impact on the quality of life of patients with Neurofibromatosis Type 1 and patients with similarly manifesting diseases. These findings open the door towards developing new therapeutic programs that contain aspects of each of the three previously listed therapies in order to most effectively improve the quality of life of Neurofibromatosis Type 1 patients. Although twenty-four relevant sources were identified, there is still much research and development that must be done to continue to evaluate and improve complementary medicine treatments to better improve the quality of life of Neurofibromatosis Type-1 patients.
Salvat-Papasseit, Joan (2014). Il poema della rosa sulle labbra e prose scelte. Introduzione di Jaume Subirana. Traduzione di Marcello Belotti. Roma: Editori Internazionali Riuniti, pp. 192
Creators: name: Gavagnin, Gabriella
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2014

description:

description: Rassegna iberistica
Linguistically Grounded Models of Language Change
Creators: name: Poibeau, Thierry
Publisher: name: arXiv
Year: 2006
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Questions related to the evolution of language have recently known an impressive increase of interest (Briscoe, 2002). This short paper aims at questioning the scientific status of these models and their relations to attested data. We show that one cannot directly model non-linguistic factors (exogenous factors) even if they play a crucial role in language evolution. We then examine the relation between linguistic models and attested language data, as well as their contribution to cognitive linguistics.
Impact of surface chemistry of upconversion nanoparticles on time-dependent cytotoxicity in non-cancerous epithelial cells
Creators: name: Märkl, Susanne
name: Przybilla, Frédéric
name: Rachel, Reinhard
name: Hirsch, Thomas
name: Keller, Max
name: Witzgall, Ralph
name: Mély, Yves
name: Wegener, Joachim
Publisher: name: Universität Regensburg
Year: 2024
Subjects: subject: 540 Chemie

description: The application of upconversion nanoparticles (UCNPs) for cell and tissue analysis requires a comprehensive understanding of their interactions with biological entities to prevent toxicity or harmful effects. Whereas most studies focus on cancer cells, this work addresses non-cancerous cells with their regular in vitro physiology. Since it is generally accepted that surface chemistry largely determines biocompatibility in general and uptake of nanomaterials in particular, two bilayer surface coatings with different surface shielding properties have been studied: (i) a phospholipid bilayer membrane (PLM) and (ii) an amphiphilic polymer (AP). Both surface modifications are applied to (12–33) nm core-shell UCNPs NaYF4(Yb, Er)@NaYF4, ensuring colloidal stability in biological media. The impact of UCNPs@AP and UCNPs@PLM on non-cancerous epithelial-like kidney cells in vitro was found to differ significantly. UCNPs@PLM did not exhibit any measurable effect on cell physiology, even with prolonged exposure. In contrast, UCNPs@AP caused changes in cell morphology and induced cell-death after approximately 30 h. These variations in toxicity are attributed to the distinct chemical stability of these particles, which likely influences their intracellular disintegration.
Comment on "187Re(gamma,n) cross section close to and above the neutron threshold"
Creators: name: Rauscher, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The work of Müller et al. [Phys. Rev. C 73, 025804 (2006); astro-ph/0512603] provides interesting experimental data on neutron emission by photodisintegration of 187Re. However, the comparison to theory and the discussed implications for the Re/Os clock require considerable amendment.
description: 2 pages; accepted for publication in Phys. Rev. C
D’Ors, Eugeni (2012). Gualba, la de mil veus. Edició, presentació i notes de Xavier Pla. Barcelona: Quaderns Crema, pp. 94
Creators: name: Carol Geronès, Lidia
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2014

description:

description: Rassegna iberistica
Allotment Car Ride
Creators: name: Hammond, Jon
name: Hernandez, Betty
name: Hicks, Lucille
name: Marine, Mandy
name: Grant, Laura
name: Durham, Kim
name: Everson, Merlene
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: xaw

description: This file, captured during a car ride between two homesite allotments, contains instances of general everyday conversation among speakers as well as occasional discussion of what is seen on the car ride.
Urban microclimate modelling methodology at pan-European level to support adaptation planning and design in cities
Creators: name: Zuccaro, Giulio
name: Leone, Mattia
name: Nardone, Stefano
name: Capolupo, Alessandra
Publisher: name: Zenodo
Year: 2019
Subjects: CLARITY
climate services
climate change
ECCA2019

description: While climate change impacts affect cities globally, adaptation measures need to be identified and designed locally, since the specific settlement and microclimate conditions determined by the characteristics of built and natural environment play a crucial role in aggravating (or reducing) the intensity of extreme weather events, such as heat waves and flooding. In the field of climate risk modelling, a key area of study concerns the integration of the urban microclimate analysis in the conventional GCM-RCM (Global Climate Model – Regional Climate Model) downscaling approach, to refine climate projections and capture the variations at urban/district scale of hazard indicators as the Mean Radiant Temperature (Trm) and the flooding paths and accumulation areas. It is an emerging and interdisciplinary field, where climate science, earth observation, urban studies, environmental design and building technology can contribute to identify suitable approaches to microclimate modelling. The H2020-CLARITY project (www.clarity-h2020.eu) aims at developing Climate Services to support the integration of adaptation measures in urban infrastructure projects, providing an innovative hazard/impact modelling methodology that takes into account urban microclimate variability. The microclimate effect in European cities is quantified by exploiting the potential of the wide amount of data generated by satellite earth observations and made available at pan-European level through the Copernicus datasets (e.g. Urban Atlas, European Settlement Map, etc.), which can be processed with specific algorithms and GIS spatial analysis tools to extract detailed information related to key parameters linked to urban morphology and surface type, such as albedo, emissivity, buildings shadows, green fraction and runoff coefficient. The proposed methodology allows to refine the information derived from climate models, with a typical maximum resolution of 10-12km (such as Euro-Cordex), at the level of a 250x250m mesh overlapped on European urban areas, thanks to the high resolution of satellite data. This information is used as input of the CLARITY Pre-feasibility assessment tool, which aims at supporting a detailed quantification of expected impacts from extreme heat and precipitation events, and a first screening of suitable adaptation measures tailored to the city-specific context. The aim is to extend through a new generation of Climate Services the application of Copernicus data, as a harmonized, freely available and expanding data repository at EU level, also exploiting the synergies with other EU initiatives, such as the Risk Data Hub currently being developed by the JRC-DRMKC (Disaster Risk Management Knowledge Centre).
Illas, Edgar (2012). Thinking Barcelona: Ideologies of a Global City. Liverpool: Liverpool University Press, pp. 244
Creators: name: Bou, Enric
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2014

description:

description: Rassegna iberistica
Stationary vortex flows and macroscopic Zeno effect in Bose-Einstein condensates with localized dissipation
Creators: name: Zezyulin, Dmitry A.
name: Konotop, Vladimir V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We theoretically demonstrate a possibility to observe the macroscopic Zeno effect in an effectively two-dimensional (pancake-shaped) repulsive Bose--Einstein condensate subjected to a strong narrow dissipation. We show that the dissipation can generate stable stationary nonlinear flows which bear either zero or non-zero topological charge (vorticity). The superfluid flows towards the dissipative defect compensate the atomic losses. The macroscopic Zeno effect manifests itself in a nonmonotonous dependence of the inward current density on the strength of the dissipation.
description: 7 pages, 2 figures, accepted for the Special Volume of "Rom. Rep. Phys.", http://www.rrp.infim.ro/
Disentanglement and decoherence in two-spin and three-spin systems under dephasing
Creators: name: Ann, Kevin
name: Jaeger, Gregg
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We compare disentanglement and decoherence rates within two-spin and three-spin entangled systems subjected to all possible combinations of local and collective pure dephasing noise combinations. In all cases, the bipartite entanglement decay rate is found to be greater than or equal to the dephasing-decoherence rates and often significantly greater. This sharpens previous results for two-spin systems [T. Yu and J. H. Eberly Phys. Rev. B 68, 165322 (2003)] and extends them to the three-spin context.
description: 17 pages
Optomechanical cooling with coherent and squeezed light: the thermodynamic cost of opening the heat valve
Creators: name: Monsel, Juliette
name: Dashti, Nastaran
name: Manjeshwar, Sushanth Kini
name: Eriksson, Jakob
name: Ernbrink, Henric
name: Olsson, Ebba
name: Torneus, Emelie
name: Wieczorek, Witlef
name: Splettstoesser, Janine
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Ground-state cooling of mechanical motion by coupling to a driven optical cavity has been demonstrated in various optomechanical systems. In our work, we provide a so far missing thermodynamic performance analysis of optomechanical sideband cooling in terms of a heat valve. As performance quantifiers, we examine not only the lowest reachable effective temperature (phonon number) but also the evacuated-heat flow as an equivalent to the cooling power of a standard refrigerator, as well as appropriate thermodynamic efficiencies, which all can be experimentally inferred from measurements of the cavity output light field. Importantly, in addition to the standard optomechanical setup fed by coherent light, we investigate two recent alternative setups for achieving ground-state cooling: replacing the coherent laser drive by squeezed light or using a cavity with a frequency-dependent (Fano) mirror. We study the dynamics of these setups within and beyond the weak-coupling limit and give concrete examples based on parameters of existing experimental systems. By applying our thermodynamic framework, we gain detailed insights into these three different optomechanical cooling setups, allowing a comprehensive understanding of the thermodynamic mechanisms at play.
description: 28 pages, 14 figures, 2 tables Small revision of the main text, corrected typos in the appendices, added study of the stability of the systems and comparison with absorption refrigerators in appendix
Eigenstate thermalization in dual-unitary quantum circuits: Asymptotics of spectral functions
Creators: name: Fritzsch, Felix
name: Prosen, Tomaž
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Chaotic Dynamics (nlin.CD)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The eigenstate thermalization hypothesis provides to date the most successful description of thermalization in isolated quantum systems by conjecturing statistical properties of matrix elements of typical operators in the (quasi-)energy eigenbasis. Here we study the distribution of matrix elements for a class of operators in dual-unitary quantum circuits in dependence of the frequency associated with the corresponding eigenstates. We provide an exact asymptotic expression for the spectral function, i.e., the second moment of this frequency resolved distribution. The latter is obtained from the decay of dynamical correlations between local operators which can be computed exactly from the elementary building blocks of the dual-unitary circuits. Comparing the asymptotic expression with results obtained by exact diagonalization we find excellent agreement. Small fluctuations at finite system size are explicitly related to dynamical correlations at intermediate times and the deviations from their asymptotical dynamics. Moreover, we confirm the expected Gaussian distribution of the matrix elements by computing higher moments numerically.
description: 15 pages, 7 figures
Influence of structural disorder and Coulomb interactions in the superconductor-insulator transition applied to boron doped diamond
Creators: name: McIntosh, R.
name: Mohanta, N.
name: Taraphder, A.
name: Bhattacharyya, S.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The influence of disorder, both structural (non-diagonal) and on-site (diagonal), is studied through the inhomogeneous Bogoliubov-de Gennes (BdG) theory in narrow-band disordered superconductors with a view towards understanding superconductivity in boron doped diamond (BDD) and boron- doped nanocrystalline diamond (BNCD) films. We employ the attractive Hubbard model within the mean field approximation, including the Coulomb interaction between holes in the narrow acceptor band. We study substitutional boron incorporation in a triangular lattice, with disorder in the form of random potential fluctuations at the boron sites. The role of structural disorder was studied through non-uniform variation of the tight-binding coupling parameter where, following ex- perimental findings, we incorporate the concurrent increase in structural disorder with increasing boron concentration. We illustrate stark differences between the effects of structural and on-site disorder and show that structural disorder has a much greater effect on the density of states, mean pairing amplitude and superfluid density than on-site potential disorder. We show that structural disorder can increase the mean pairing amplitude while the spectral gap in the density of states decreases with states eventually appearing within the spectral gap for high levels of disorder. This study illustrates how the effects of structural disorder can explain some of the features found in superconducting BDD and BNCD films such as a tendency towards saturation of the T_{c} with boron doping and deviations from the expected BCS theory in the temperature dependence of the pairing amplitude and spectral gap.
Household-Specific Regressions Using Clickstream Data
Creators: name: Goldfarb, Avi
name: Lu, Qiang
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: This paper makes three contributions: (1) the paper provides a better understanding of online behavior by showing the main drivers of Internet portal choice, (2) the rich data allow for a deeper understanding of brand substitution patterns than previously possible and (3) the paper introduces a wider statistics community to a new data opportunity and a recently developed method.
description: Published at http://dx.doi.org/10.1214/088342306000000150 in the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Cohomogeneity one Ricci Solitons from Hopf Fibrations
Creators: name: Wink, Matthias
Publisher: name: arXiv
Year: 2017
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C25, 53C44 (Primary), 53C30 (Secondary)

description: This paper studies cohomogeneity one Ricci solitons. If the isotropy representation of the principal orbit $G/K$ consists of two inequivalent $Ad_K$-invariant irreducible summands, the existence of parameter families of non-homothetic complete steady and expanding Ricci solitons on non-trivial bundles is shown. These examples were detected numerically by Buzano-Dancer-Gallaugher-Wang. The analysis of the corresponding Ricci flat trajectories is used to reconstruct Einstein metrics of positive scalar curvature due to Böhm. The techniques also apply to $m$-quasi-Einstein metrics.
description: 34 pages, asymptotics refined
Anisotropic effects of background fields on Born-Infeld electromagnetic waves
Creators: name: Aiello, Matias
name: Bengochea, Gabriel
name: Ferraro, Rafael
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We show exact solutions of Born-Infeld theory for electromagnetic plane waves propagating in the presence of static background fields. The non-linear character of Born-Infeld equations generates an interaction between background and wave that changes the speed of propagation and adds a longitudinal component to the wave. As a consequence, in a magnetic background the ray direction differs from the propagation direction --a behavior resembling the one of a wave in an anisotropic medium--. This feature could open up a way to experimental tests of Born-Infeld theory.
description: 4 pages, Revtex4, 1 figure, corrected typos, comments clarified, version accepted for publication
Complete Ricci solitons via estimates on the soliton potential
Creators: name: Wink, Matthias
Publisher: name: arXiv
Year: 2017
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C25, 53C44 (Primary), 53C30 (Secondary)

description: In this paper a growth estimate on the soliton potential is shown for a large class of cohomogeneity one manifolds. This is used to construct continuous families of complete steady and expanding Ricci solitons in the set-ups of Lü-Page-Pope and Dancer-Wang. It also provides a different approach to the two summands system which applies to all known geometric examples.
description: 22 pages
Cosmological solutions and growth index of matter perturbations in $f(Q)$ gravity
Creators: name: Khyllep, Wompherdeiki
name: Paliathanasis, Andronikos
name: Dutta, Jibitesh
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The present work studies one of Einstein's alternative formulations based on the non-metricity scalar $Q$ generalized as $f(Q)$ theory. More specifically, we consider the power-law form of $f(Q)$ gravity i.e. $f(Q)=Q+α\, Q^n$. Here, we analyze the behavior of the cosmological model at the background and perturbation level. At the background level, we find the effective evolution of the model is the same as that of the $Λ$CDM for $|n|<1$. Interestingly, the geometric component of the theory solely determined the late-time acceleration of the Universe. We also examine the integrability of the model by employing the method of singularity analysis. In particular, we find the conditions under which field equations pass the Painlevé test and hence possess the Painlevé property. While the equations pass the Painlevé test in the presence of dust for any value of $n$, the test is valid after the addition of radiation fluid only for $n<1$. Finally, at the perturbation level, the behavior of matter growth index signifies a deviation of the model from the $Λ$CDM even for $|n|<1$.
description: 17 pages and 7 figs
Charged wormholes in spacetimes of embedding class one
Creators: name: Kuhfittig, Peter K. F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The existence of charged black holes has suggested that wormholes may also be charged. The purpose of this paper is to construct a general model of a charged wormhole that proves to be a natural extension of the original Morris-Thorne wormhole. This goal is achieved by means of the classical embedding theory that has played a major role in the general theory of relativity.
description: 6 pages, no figures
Scaling behavior and positivity violation of the gluon propagator in full QCD
Creators: name: Bowman, Patrick O.
name: Heller, Urs M.
name: Leinweber, Derek B.
name: Parappilly, Maria B.
name: Sternbeck, Andre
name: von Smekal, Lorenz
name: Williams, Anthony G.
name: Zhang, Jianbo
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The Landau-gauge gluon propagator is studied using the coarse and fine dynamical MILC configurations. The effects of dynamical quarks are clearly visible and lead to a reduction of the nonperturbative infrared enhancement relative to the quenched case. Lattice spacing effects are studied and found to be small. The gluon spectral function is shown to clearly violate positivity in both quenched and full QCD.
description: 7 pages, 9 figures. References and 1 figure added, minor text modifications, version to be published in PRD
Capability of future linear colliders to discover heavy neutral CP-even and CP-odd Higgs bosons within Type-I 2HDM
Creators: name: Hashemi, Majid
name: Haghighat, Gholamhossein
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this study, assuming the type-I 2HDM at SM-like scenario, observability of heavy neutral CP-even and CP-odd Higgs bosons $H$ and $A$ at a linear collider operating at $\sqrt{s}=1$ TeV is investigated through the signal process chain $e^- e^+ \rightarrow A H \rightarrow ZHH$ where the $Z$ boson experiences a leptonic ($e^-e^+$ or $μ^-μ^+$) decay and the $H$ Higgs boson is assumed to decay into a di-photon. This signal process is motivated especially by the clean signature which leptonic and photonic events can provide at colliders, and also by the enhancement due to the charged Higgs-mediated contribution to $H$ di-photon decay at large $\tanβ$ values. Simulation is based on four benchmark points according to which the Higgs mass $m_H$ ($m_A$) varies within the range $150$-$300$ ($200$-$400$) GeV. Energy smearing of jets and photons are performed, and momentum smearing is also applied to leptons. Results indicate that, for all of the assumed benchmark points, the Higgs bosons $H$ and $A$ are observable with measurable masses, and with signals exceeding $5σ$ at integrated luminosities $111$ and $201\,fb^{-1}$ respectively. Such luminosities are easily accessible to future linear colliders.
description: 31 pages, 29 figures, 11 tables
Past Events and Memories
Creators: name: Hammond, Jon
name: Hernandez, Betty
name: Hicks, Lucille
name: Grant, Laura
name: Turner, Julie
name: Everson, Merlene
name: Girado, Luther
name: Turner, David
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: xaw

description: This file, captured during a car ride to a homesite, contains discussions of past events, covering topics from sporting activities to leisure activities to an incident in which a speaker was bitten by a dog. In the second half of the recording, one of the speakers is angered and leaves.
Quantum gravity as the way from spacetime to space quantum states thermodynamics
Creators: name: Glinka, L. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
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: Physical spacetime geometry follows from some effective thermodynamics of quantum states of all fields and particles described in frames of General Relativity. In the sense of pure field theoretical Einstein's point of view on gravitation the thermodynamic information is actually quantum gravity. We propose new realization of this old idea by studying the canonical 3+1 Dirac-ADM approach to pseudo-Riemannian (Lorentzian) manifold of General Relativity. We derive the Wheeler-DeWitt theory as the Global One-Dimensional classical field theory of the Bose field associated with embedded 3-space, where Wheeler's superspace metric is absent. The classical theory is discussed, some deductions on tachyon state, Dark Energy density and cosmological constant are included. Reduction to 1st order evolution is carried out, and quantum theory by the second quantization in the Fock space of creators and annihilators is constructed by employing the Heisenberg equation and the bosonic Bogoliubov transformation for diagonalization. In result we find the static reper with stable vacuum, where quantum states of 3-space can be considered, and finally space quantum states thermodynamics is formulated.
description: 65 pages, 12 figures
Topological constraints on magnetostatic traps
Creators: name: Gerritsma, R.
name: Spreeuw, R. J. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We theoretically investigate properties of magnetostatic traps for cold atoms that are subject to externally applied uniform fields. We show that Ioffe Pritchard traps and other stationary points of $B$ are confined to a two-dimensional curved manifold defined by $\det(\partial B_i/\partial x_j)=0$. We describe how stationary points can be moved over the manifold by applying external uniform fields. The manifold also plays an important role in the behavior of points of zero field. Field zeroes occur in two distinct types, in separate regions of space divided by the manifold. Pairs of zeroes of opposite type can be created or annihilated on the manifold. Finally, we give examples of the manifold for cases of practical interest.
description: 7 pages, 5 figures
Supplementary document for Digital labeling for 3D histology: segmenting blood vessels without vascular contrast agent using deep learning - 6313147.pdf
Creators: name: Lapierre-Landry, Maryse
name: Liu, Yehe
name: Bayat, Mahdi
name: Wilson, David
name: Jenkins, Michael
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Knowledge Representation and Machine Learning

description: supplemental figure 1-4
Radiative Driving of the AGN Outflows in the Narrow-Line Seyfert 1 Galaxy NGC 4051
Creators: name: Meena, Beena
name: Crenshaw, D. Michael
name: Schmitt, Henrique R.
name: Revalski, Mitchell
name: Fischer, Travis C.
name: Polack, Garrett E.
name: Kraemer, Steven B.
name: Dashtamirova, Dzhuliya
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We explore the properties of ionized gas in the nuclear and circumnuclear environment of the narrow-line Seyfert 1 galaxy NGC 4051 using spectroscopic and imaging observations from the Hubble Space Telescope (HST) and Apache Point Observatory (APO)'s ARC 3.5m Telescope. We identify an unresolved moderate-density intermediate width component and a high-density broad component in the optical emission lines from the active nucleus, as well as spatially-resolved emission extending up to $\sim$1 kpc in the AGN ionized narrow-line region (NLR) and $\sim$8 kpc in the stellar ionized host galaxy. The HST narrow-band image reveals a distinct conical structure in [O III] emission towards the NE, and the ionized gas kinematics shows up to two blueshifted velocity components, indicating outflows along the edges of a cone. We introduce an improved model of biconical outflow, with our line of sight passing through the wall of the cone, which suggests that the large number of outflowing UV absorbers seen in NGC 4051 are NLR clouds in absorption. Using the de-projection factors from the biconical geometry, we measure true outflow velocities up to 680 km s$^{-1}$ at a distance of $\sim$350 pc, however, we do not find any rotational signature inside a projected distance $\leq$ 10'' ($\sim$800 pc) from the nucleus. We compare the gas kinematics with analytical models based on a radiation-gravity formalism, which show that most of the observed NLR outflows are launched within $\sim$0.5 pc of the nucleus and can travel up to $\sim$1 kpc from this low-luminosity AGN.
description: 29 Pages, 16 Figures, 4 Tables. Accepted for publication in ApJ
Generation of Pure-State Single-Photon Wavepackets by Conditional Preparation Based on Spontaneous Parametric Downconversion
Creators: name: U'Ren, Alfred B.
name: Silberhorn, Christine
name: Erdmann, Reinhard
name: Banaszek, Konrad
name: Grice, Warren P.
name: Walmsley, Ian A.
name: Raymer, Michael G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the conditional preparation of single photons based on parametric downconversion, where the detection of one photon from a given pair heralds the existence of a single photon in the conjugate mode. We derive conditions on the modal characteristics of the photon pairs, which ensure that the conditionally prepared single photons are quantum-mechanically pure. We propose specific experimental techniques that yield photon pairs ideally suited for single-photon conditional preparation.
description: 14 pages, 6 figures