cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Tourists, art and airports : the Vancouver international airport as a site of cultural negotiation
Creators: name: Leddy, Shannon C.
Publisher: name: University of British Columbia
Year: 2009

description: This work deals with the notion of hybridity; an ideal moment of cultural negotiation which results, in the words of Homi Bhabha, in the creation of a 'third space.' This theoretical plateau is formed by two parties whose agendas, while ostensibly conflicting, overlap enough so that each informs the space but neither dominates it . In this case I examine a specific site of hybridity, the "Arrivals Passengers Only" area of the Vancouver International Airport. Here, the space is informed by the presence of works, created by the Coast Salish Musqueam people, in the Airport Terminal, created by the Vancouver International Airport Authority. While this sort of negotiation can be described using positive and progressive terms, and the creation of a third space represents a compelling ideal, I argue that the moment of hybridity within the airport is ultimately undermined by other areas of the building in which no negotiation has taken place. The airport's role as a business necessitates marketing strategies aimed mainly at tourists and other business interests. Since virtually the entire building is devoted to that market, the negotiated hybrid space becomes hidden so that its potential impact is lost. Although participating in the creation of a working model of culture with the Musqueam people, the Airport ends up destabilising that model and the space, the ‘third space,’ which contains it. This particular example points to a site specific aspect of contemporary North American culture by drawing on the local community as a source for investigating that discourse. The thesis, then, has two points of entry; the ephemeral discourse of cultural negotiation and the locally grounded freeze-frame view of one site in contemporary Vancouver.
Atores Internacionais na Crise do Canal de Suez
Creators: name: das Neves Fernandes, Fernanda Cristina
Publisher: name: Zenodo
Year: 2020
Subjects: International Relations
Suez Canal
Suez Canal Conflict
Relações Internacionais
Canal de Suez
Crise do Canal de Suez
Realismo
Neo-liberalismo
Nações Unidas

description: A presente pesquisa tem por objetivo explorar os fatos ocorridos no Egito que levaram ao surgimento da crise do Canal de Suez, assim como as ações e interesses dos atores envolvidos. Busca-se fazer uma análise dessas ações sob perspectivas teóricas das Relações Internacionais, com o propósito de se chegar a um consenso quanto a teoria que melhor poderá explanar o conflito, buscando saber se de fato, os Estados agiram de maneira a desafiar o equilíbrio de poder com o intuito de evitar uma guerra de escopo mundial ou se agiram em razão do interesse nacional e da busca de poder, a fim de garantir sua sobrevivência.  Utiliza-se a perspectiva pós-colonial para analisar as ações do Estado egípcio, a fim de que suas ações não sejam interpretadas à luz de teorias do campo das relações internacionais provenientes de uma visão eurocentrista. Nos demais capítulos, analisamos as ações e interesses dos atores, assim como seus instrumentos de poder através do uso de diálogos de acadêmicos. 

 

 

Palavras-chave: Crise do Canal de Suez. Nações Unidas. Realismo. Neo-liberalismo.
On stochastic fractional Volterra equations in Hilbert space
Creators: name: Karczewska, Anna
name: Lizama, Carlos
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: Primary: 60H15, 60H20; secondary: 60H05, 45D05

description: In this paper stochastic Volterra equations admitting exponentially bounded resolvents are studied. After obtaining convergence of resolvents, some properties of stochastic convolutions are given. The paper provides a sufficient condition for a stochastic convolution to be a strong solution to a stochastic Volterra equation.
description: Extended version of the talk given at AIMS' Sixth International Conference on Dynamical Systems, Differential Equations and Applications, Poitiers, June 25 - 28, 2006. 11 pages
TFAW survey. I. Wavelet-based denoising of K2 light curves. Discovery and validation of two new Earth-sized planets in K2 campaign 1
Creators: name: del Ser, Daniel
name: Fors, Octavi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The wavelet-based detrending and denoising method \texttt{TFAW} is applied for the first time to \texttt{EVEREST 2.0}-corrected light curves to further improve the photometric precision of almost all K2 observing campaigns (C1-C8, C12-C18). The performance of both methods is evaluated in terms of 6 hr combined differential photometric precision (CDPP), simulated transit detection efficiency, and planet characterization in different SNR regimes. On average, \texttt{TFAW} median 6hr CDPP is $\sim$30$\%$ better than the one achieved by \texttt{EVEREST 2.0} for all observing campaigns. Using the \texttt{transit least-squares} (\texttt{TLS}) algorithm, we show that the transit detection efficiency for simulated Earth-Sun-like systems is $\sim$8.5$\times$ higher for \texttt{TFAW}-corrected light curves than for \texttt{EVEREST 2.0} ones. Using the light curves of two confirmed exoplanets, K2-44 b (high-SNR) and K2-298 b (low-SNR), we show that \texttt{TFAW} yields better MCMC posterior distributions, transit parameters compatible with the cataloged ones but with smaller uncertainties and narrows the credibility intervals. We use the combination of \texttt{TFAW}'s improved photometric precision and \texttt{TLS} enhancement of the signal detection efficiency for weak signals to search for new transit candidates in K2 observing campaign 1. We report the discovery of two new K2-C1 Earth-sized planets statistically validated, using the \texttt{vespa} software: EPIC 201170410.02, with a radius of 1.047$^{+0.276}_{-0.257}R_{\oplus}$ planet orbiting an M-type star, and EPIC 201757695.02, with a radius of 0.908$^{+0.059}_{-0.064}R_{\oplus}$ planet orbiting a K-type star. EPIC 201757695.02 is the 9-th smallest planet ever discovered in K2-C1, and the 39-th smallest in all K2 campaigns.
description: 22 pages, 11 figures, 10 tables. Published in MNRAS
Understanding the multifaceted contribution of replication stress to disease outcome and therapy
Creators: name: Barreto-Galvez, Angelica Maria
Publisher: name: No Publisher Supplied
Year: 2023

description: Precise duplication of the genome is essential to maintain genomic stability. It is essential that cells replicate their whole genome once every cell cycle, as incomplete or re-replication of DNA during a single S-phase can lead to chromosomal aberrations, resulting in genomic instability, a hallmark of cancer. However, cells are constantly exposed to endogenous and exogenous replication stressors that can compromise the fidelity of the DNA replication. The presence and coordinated activity of highly conserved mechanisms, such as the replicative checkpoints and the DNA damage response (DDR), ensure proper DNA replication before entry into mitosis. Therefore, the absence of specific proteins that facilitate any of those key mechanisms can negatively impact genome integrity. This thesis delineates novel functions for proteins involved in DNA replication, transcription, and repair and describes how the lack of these proteins results in replication defects and genomic instability. Chapter one discusses the role and importance of translesion polymerase Eta in facilitating DNA replication at difficult to replicate loci called common fragile sites (CFS). Chapter two describes a novel role of the Plant Homeodomain 6 protein (PHF6) in preserving CFS stability through DNA repair. Chapter three explores the mechanistic importance of the E1A binding protein (EP300) in DNA replication initiation and completion, using Adult T-cell leukemia/lymphoma as a study model. The final chapter evaluates the sustained effects of an unprecedented environmental exposure to aerosolized dust, gases, and potential carcinogens, during the 9/11 terrorist attacks on the World Trade Center (WTC), to DNA damage accumulation and somatic hypermutation in first responder fire fighters. Collectively, the research outlined in this thesis aims to provide an in-depth understanding of the molecular mechanisms underlying genomic instability in response to specific protein deficiencies or exogenous environmental exposures and provide novel insights into identifying therapeutic targets in a broad range of diseases, specifically cancers.
Two-color discrete localized modes and resonant scattering in arrays of nonlinear quadratic optical waveguides
Creators: name: Molina, M. I.
name: Vicencio, R. A.
name: Kivshar, Y. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We analyze the properties and stability of two-color discrete localized modes in arrays of channel waveguides where tunable quadratic nonlinearity is introduced as a nonlinear defect by periodic poling of a single waveguide in the array. We show that, depending on the value of the phase mismatch and the input power, such two-color defect modes can be realized in three different localized states. We also study resonant light scattering in the arrays with the defect waveguide.
description: 10 pages, 3 figures, published in PRE
Completing the Protostellar Luminosity Function in Cygnus-X with SOFIA/FORCAST Imaging
Creators: name: Cheng, Yingjie
name: Gutermuth, Robert A.
name: Offner, Stella
name: Hemeon-Heyer, Mark
name: Zinnecker, Hans
name: Megeath, S. Thomas
name: Pokhrel, Riwaj
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a new SOFIA/FORCAST mid-IR survey of luminous protostars and crowded star-forming environments in Cygnus X, the nearest million-solar mass molecular cloud complex. We derive bolometric luminosities for over 1000 sources in the region with these new data in combination with extant Spitzer and UKIDSS photometry, with 63 new luminous protostar candidates identified by way of the high quality SOFIA/FORCAST data. By including FORCAST data, we construct protostellar luminosity functions (PLFs) with improved completeness at the high luminosity end. The PLFs are well described by a power law function with an index of ~-0.5. Based on the Herschel temperature and column density measurements, we find no obvious dependence of the PLFs on the local gas temperature, but PLFs in regions of high stellar density or gas column density exhibit some excess at higher luminosities. Through the comparison between our observed PLFs and existing accretion models, both the turbulent core (TC) and the competitive accretion (CA) models are consistent with our results, while the isothermal sphere (IS) model is disfavored. The implications of these results on the star formation process are discussed.
description: 20 pages, 21 figures, Accepted for publication in MNRAS
Deterministically Isolating a Perfect Matching in Bipartite Planar Graphs
Creators: name: Datta, Samir
name: Kulkarni, Raghav
name: Roy, Sambuddha
Publisher: name: arXiv
Year: 2008
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We present a deterministic way of assigning small (log bit) weights to the edges of a bipartite planar graph so that the minimum weight perfect matching becomes unique. The isolation lemma as described in (Mulmuley et al. 1987) achieves the same for general graphs using a randomized weighting scheme, whereas we can do it deterministically when restricted to bipartite planar graphs. As a consequence, we reduce both decision and construction versions of the matching problem to testing whether a matrix is singular, under the promise that its determinant is 0 or 1, thus obtaining a highly parallel SPL algorithm for bipartite planar graphs. This improves the earlier known bounds of non-uniform SPL by (Allender et al. 1999) and $NC^2$ by (Miller and Naor 1995, Mahajan and Varadarajan 2000). It also rekindles the hope of obtaining a deterministic parallel algorithm for constructing a perfect matching in non-bipartite planar graphs, which has been open for a long time. Our techniques are elementary and simple.
Vector solitons in nearly-one-dimensional Bose-Einstein condensates
Creators: name: Salasnich, Luca
name: Malomed, Boris A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We derive a system of nonpolynomial Schroedinger equations (NPSEs) for one-dimensional wave functions of two components in a binary self-attractive Bose-Einstein condensate loaded in a cigar-shaped trap. The system is obtained by means of the variational approximation, starting from the coupled 3D Gross-Pitaevskii equations and assuming, as usual, the factorization of 3D wave functions. The system can be obtained in a tractable form under a natural condition of symmetry between the two species. A family of vector (two-component) soliton solutions is constructed. Collisions between orthogonal solitons (ones belonging to the different components) are investigated by means of simulations. The collisions are essentially inelastic. They result in strong excitation of intrinsic vibrations in the solitons, and create a small orthogonal component ("shadow") in each colliding soliton. The collision may initiate collapse, which depends on the mass and velocities of the solitons.
description: 7 pages, 6 figures; Physical Review A, in press
Probability Analysis and Comparison of Well-Known Integer Factorization Algorithms
Creators: name: Krishna, Duggirala Meher
name: Ravi, Duggirala
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics

description: Two prominent methods for integer factorization are those based on general integer sieve and elliptic curve. The general integer sieve method can be specialized to quadratic integer sieve method. In this paper, a probability analysis for the success of these methods is described, under some reasonable conditions. The estimates presented are specialized for the elliptic curve factorization. These methods are compared through heuristic estimates. It is shown that the elliptic curve method is a probabilistic polynomial time algorithm under the assumption of uniform probability distribution for the arising group orders and clearly more likely to succeed, faster asymptotically.
The Puzzling Story of Flare Inactive Ultra Fast Rotating M dwarfs. II. Searching for radial velocity variations
Creators: name: Ramsay, Gavin
name: Hakala, Pasi
name: Doyle, J. Gerry
name: Doyle, Lauren
name: Bagnulo, Stefano
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Observations made using TESS revealed a sample of low mass stars which show a periodic modulation on a period $<0.2$~d. Surprisingly many of these Ultra Fast Rotating (UFR) stars showed no evidence of flare activity which would be expected from such rapidly rotating stars. We present results from a spectroscopic survey of UFRs using the Nordic Optical Telescope to search for radial velocity variations which could reveal evidence for binarity. Our sample of 29 sources have a photometric period between 0.1-0.2d, cover spectral classes of M0-4V, and show no evidence for flares. We detect only one source with clear radial velocity shifts, with another two having Gaia RUWE values which suggests they are binaries. Further observations reveal the former star possibly contains a brown dwarf companion with a mass of M$_2$>58 M$_{\rm Jup}$ and probability P(M$_2$<90 M$_{\rm Jup}$) = 50\%. There is no evidence for the companion in our spectra, strengthening the case for a brown dwarf companion. We also examine the folded TESS light curves of all our targets, finding at least two are eclipsing binaries and one which has been contaminated by a spatially nearby $δ$ Sct star. We estimate that around 1/4 of our targets may have been contaminated by short period variable stars. However, the majority of our targets are consistent with being single, low mass stars whose variability is due to starspots. We outline the possible reasons why they are not flare active despite being such rapid rotators.
description: Accepted MNRAS main journal
An Improved Randomized Truthful Mechanism for Scheduling Unrelated Machines
Creators: name: Lu, Pinyan
name: Yu, Changyuan
Publisher: name: arXiv
Year: 2008
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: We study the scheduling problem on unrelated machines in the mechanism design setting. This problem was proposed and studied in the seminal paper (Nisan and Ronen 1999), where they gave a 1.75-approximation randomized truthful mechanism for the case of two machines. We improve this result by a 1.6737-approximation randomized truthful mechanism. We also generalize our result to a $0.8368m$-approximation mechanism for task scheduling with $m$ machines, which improve the previous best upper bound of $0.875m(Mu'alem and Schapira 2007).
The Effect of Enriched Accreted Matter on the Development of Novae
Creators: name: Hillman, Yael
name: Gerbi, Maya
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The development of a nova eruption is well known to be determined by the white dwarf (WD) mass and the rate at which it accretes mass from its donor. One of the advancements in this field is the understanding that the occurrence of a nova eruption depends on the presence of heavy elements in the envelope, and that the concentration of these elements is highly dependent on the time allotted for accretion. This results in many features of the eruption being correlated with the mass fractions of heavy elements in the ejected material, however, the accreted material is always assumed to be of solar metallicity. Here we explored the entire range of accretion rates onto a 1.25$M_\odot$ WD for two cases of highly enriched accreted material and find enrichment to have an influence on certain features for high accretion rates, while the effect of enrichment on low accretion rates is negligible. We further find that the ignition of the thermonuclear runaway which is known to be dependent on the accumulation of a critical mass, is actually dependent on the accumulation of a critical amount of heavy elements.
description: Accepted for publication in MNRAS
A Fourier optics approach to evaluate the astrometric performance of MICADO
Creators: name: Born, J. A. van den
name: Jellema, W.
name: Navarro, R.
name: Tolstoy, E.
name: Jayawardhana, B.
name: Janssen, A. W.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present our investigation into the impact of wavefront errors on high accuracy astrometry using Fourier Optics. MICADO, the upcoming near-IR imaging instrument for the Extremely Large Telescope, will offer capabilities for relative astrometry with an accuracy of 50 micro arcseconds (μas). Due to the large size of the point spread function (PSF) compared to the astrometric requirement, the detailed shape and position of the PSF on the detector must be well understood. Furthermore, because the atmospheric dispersion corrector of MICADO is a moving component within an otherwise mostly static instrument, it might not be sufficient to perform a simple pre-observation calibration. Therefore, we have built a Fourier Optics framework, allowing us to evaluate the small changes in the centroid position of the PSF as a function of wavefront error. For a complete evaluation, we model both the low order surface form errors, using Zernike polynomials, and the mid- and high-spatial frequencies, using Power Spectral Density analysis. The described work will then make it possible, performing full diffractive beam propagation, to assess the expected astrometric performance of MICADO.
description: 13 pages, 13 figures, to be submitted to the SPIE Astronomical Telescopes & Instrumentation 2020 conference
Josephson Oscillation and Transition to Self-Trapping for Bose-Einstein-Condensates in a Triple-Well Trap
Creators: name: Liu, Bin
name: Fu, Li-Bin
name: Yang, Shi-Ping
name: Liu, Jie
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We investigate the tunnelling dynamics of Bose-Einstein-Condensates(BECs) in a symmetric as well as in a tilted triple-well trap within the framework of mean-field treatment. The eigenenergies as the functions of the zero-point energy difference between the tilted wells show a striking entangled star structure when the atomic interaction is large. We then achieve insight into the oscillation solutions around the corresponding eigenstates and observe several new types of Josephson oscillations. With increasing the atomic interaction, the Josephson-type oscillation is blocked and the self-trapping solution emerges. The condensates are self-trapped either in one well or in two wells but no scaling-law is observed near transition points. In particular, we find that the transition from the Josephson-type oscillation to the self-trapping is accompanied with some irregular regime where tunnelling dynamics is dominated by chaos. The above analysis is facilitated with the help of the Poicaré section method that visualizes the motions of BECs in a reduced phase plane.
description: 10 pages, 11 figures
A multi-wavelength view of distinct accretion regimes in the pulsating ultraluminous X-ray source NGC 1313 X-2
Creators: name: Sathyaprakash, Rajath
name: Roberts, Timothy P.
name: Grisè, Fabien
name: Kaaret, Philip
name: Ambrosi, Elena
name: Done, Christine
name: Gladstone, Jeanette C.
name: Kajava, Jari
name: Soria, Roberto
name: Zampieri, Luca
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: NGC 1313 X-2 is one of the few known pulsating ultraluminous X-ray sources (PULXs), and so is thought to contain a neutron star that accretes at highly super-Eddington rates. However, the physics of this accretion remains to be determined. Here we report the results of two simultaneous XMM-Newton and HST observations of this PULX taken to observe two distinct X-ray behaviours as defined from its Swift light curve. We find that the X-ray spectrum of the PULX is best described by the hard ultraluminous (HUL) regime during the observation taken in the lower flux, lower variability amplitude behaviour; its spectrum changes to a broadened disc during the higher flux, higher variability amplitude epoch. However, we see no accompanying changes in the optical/UV fluxes, with the only difference being a reduction in flux in the near-IR as the X-ray flux increased. We attempt to fit irradiation models to explain the UV/optical/IR fluxes but they fail to provide meaningful constraints. Instead, a physical model for the system leads us to conclude that the optical light is dominated by a companion O/B star, albeit with an IR excess that may be indicative of a jet. We discuss how these results may be consistent with the precession of the inner regions of the accretion disc leading to changes in the observed X-ray properties, but not the optical, and whether we should expect to observe reprocessed emission from ULXs.
description: Accepted for publication in MNRAS. Any comments welcome
title: Тест-тест
title: отчет о НИР
titleType: Subtitle
title: Test-test
Creators: name: Анисимова, Светлана
Publisher: name: Санкт-Петербургский политехнический университет Петра Великого
Year: 2020
Subjects: ключевые слова
keyword
Договор ОНТД 13

description: Аннотация
description: Abstract
Effects of [alpha]-bungarotoxin treatment on murine neuromuscular transmission
Creators: name: Katul, Ziad J.
Publisher: name: University of British Columbia
Year: 2009

description: The development and growth of the mammalian neuromuscular junction (NMJ) is orchestrated by complex antero- and retrograde signals exchanged between the nerve terminal and the muscle. The adult NMJ has been shown to display morphological plasticity manifest under conditions of increased or decreased muscle activity, denervation (surgical and pharmacologic) and aging, as part of a continuum of responses to stresses imposed on neuromuscular transmission. Therefore, it seemed plausible to hypothesize that a reduction in postsynaptic sensitivity to ACh with consequent reduced muscle fiber activity would elicit functional changes (an increase or decrease in ACh release) mediated by anterograde and muscle-derived retrograde factors. Using mice, I produced a chronic reduction of functional AChRs by a 3-week, subparalytic treatment with the irreversible AChR antagonist, ot-bungarotoxin. Dose of toxin was adjusted based on the weight and strength of the animals. Strength was assessed by placing the mouse on a rotating rod and monitoring the time it was capable of sustaining itself without falling. Treated animals exhibited a marked reduction in their ability to stay 'roto-rod'. Subsequent electrophysiological experiments were performed on the isolated phrenic nerve/hemidiaphragm preparations to record both spontaneous and evoked ACh release under a variety of Ca and K concentrations and stimulation protocols (30 s 10 Hz period followed by 60 trains-of-ten at 70 Hz at each junction); The chronic treatment with a-bungarotoxin caused an increase in spontaneous and evoked ACh release detected by intracellular microelectrode recordings from the muscle fiber cell. However, the log normal distribution of release was unaltered and neither was its average facilitation in response to train stimulation. Train-evoked release relative to antecedent 10 Hz quantal content or by mean train quantal content was the same in both animal groups but of greater variability in controls. The variance associated with release was found to be similar in both control and treated animals. In summary, I have provided evidence that a chronic reduction in muscle sensitivity to released ACh results in the upregulation of both spontaneous and evoked release, perhaps via the central (CNS) summation and processing of retrograde signals from individual junctions. Our data also suggest that spontaneous ACh release may have a physiological role at the adult NMJ, one of sensing the integrity and level of function of the synapse.
A Spectroscopic Survey of Faint Quasars in the SDSS Deep Stripe: I. Preliminary Results from the Co-added Catalog
Creators: name: Jiang, L.
name: Fan, X.
name: Cool, R. J.
name: Eisenstein, D. J.
name: Zehavi, I.
name: Richards, G. T.
name: Scranton, R.
name: Johnston, D.
name: Strauss, M. A.
name: Schneider, D. P.
name: Brinkmann, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper we present the first results of a deep spectroscopic survey of faint quasars in the Sloan Digital Sky Survey (SDSS) Southern Survey, a deep survey carried out by repeatedly imaging a 270 deg^2 area. Quasar candidates were selected from the deep data with good completeness over 02.0) at the faint end, indicating a break in the QLF slope. Using a luminosity-dependent density evolution model, we find that the quasar density at M_{g}
description: 25 pages, 13 figures, accepted for publication in AJ
Late-Time X-ray Observations of the Transient Source Cygnus A-2
Creators: name: Snios, Bradford
name: De Vries, Martijn
name: Nulsen, Paul E. J.
name: Kraft, Ralph P.
name: Siemiginowska, Aneta
name: Wise, Michael W.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We examine Chandra observations of the powerful Fanaroff-Riley class II (FR II) radio galaxy Cygnus A for an X-ray counterpart to the radio transient Cygnus A-2 that was first detected in 2011. Observations are performed using the High-Resolution Camera (HRC) instrument in order to spatially resolve Cygnus A-2 and the central Active Galactic Nucleus (AGN) at a separation of 0.42 arcseconds. Simulated images are generated of the emission region, and radial profiles for the region of interest are extracted. A comparison between the simulations and observations reveals no X-ray detection of Cygnus A-2 to a 0.5-7.0 keV flux upper limit of $1.04 \times 10^{-12}\rm\,erg\,cm^{-2}\,s^{-1}$, or a rest-frame 2-10 keV luminosity of $8.6\times 10^{42}\rm\,erg\,s^{-1}$. We estimate the black hole mass of Cygnus A-2 based on our X-ray flux limit and find it to be consistent with a flaring black hole rather than a steadily accreting source. The HRC observations are additionally compared with archival ACIS data from 2016-2017, and both the overall morphology and the flux limits of the AGN complex agree between the two datasets. This consistency is despite the pile-up effect in ACIS which was previously considered to bias the observed morphology of the AGN. The agreement between the datasets demonstrates the viability of utilizing the archival Chandra data of Cygnus A to analyze its AGN at an unprecedented level of precision.
description: Accepted to MNRAS, 6 pages, 4 figures, 2 tables
ПСИХОЛОГ КАДРЛАРНИ УЗЛУКСИЗ КАСБИЙ РИВОЖЛАНТИРИШ МЕТОДИКАСИНИ ТАКОМИЛЛАШТИРИШ ЙЎЛЛАРИ
Creators: name: Хайтимметова, Элмира
name: Жуманова, Гулмира
Publisher: name: Zenodo
Year: 2024

description: мақолада психолог кадрларни касбий ривожлантириш, синов ва касбий қўллашнинг дастлабки босқичи таълим психологининг асосий муаммолари, такомиллаштириш йўллари таҳлил қилинади. Психолог кадрларни касбий шаклланиш ва такомиллаштиришда таълим психолог кадрларнинг ваколатлари баён этилади.
FLaaS: Federated Learning as a Service
Creators: name: Kourtellis, Nicolas
name: Katevas, Kleomenis
name: Perino, Diego
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Cryptography and Security (cs.CR)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Federated Learning (FL) is emerging as a promising technology to build machine learning models in a decentralized, privacy-preserving fashion. Indeed, FL enables local training on user devices, avoiding user data to be transferred to centralized servers, and can be enhanced with differential privacy mechanisms. Although FL has been recently deployed in real systems, the possibility of collaborative modeling across different 3rd-party applications has not yet been explored. In this paper, we tackle this problem and present Federated Learning as a Service (FLaaS), a system enabling different scenarios of 3rd-party application collaborative model building and addressing the consequent challenges of permission and privacy management, usability, and hierarchical model training. FLaaS can be deployed in different operational environments. As a proof of concept, we implement it on a mobile phone setting and discuss practical implications of results on simulated and real devices with respect to on-device training CPU cost, memory footprint and power consumed per FL model round. Therefore, we demonstrate FLaaS's feasibility in building unique or joint FL models across applications for image object detection in a few hours, across 100 devices.
description: 7 pages, 4 figures, 7 subfigures, 34 references
Tight Bounds for Blind Search on the Integers
Creators: name: Dietzfelbinger, Martin
name: Rowe, Jonathan E.
name: Wegener, Ingo
name: Woelfel, Philipp
Publisher: name: arXiv
Year: 2008
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: We analyze a simple random process in which a token is moved in the interval $A=\{0,...,n\$: Fix a probability distribution $μ$ over $\{1,...,n\$. Initially, the token is placed in a random position in $A$. In round $t$, a random value $d$ is chosen according to $μ$. If the token is in position $a\geq d$, then it is moved to position $a-d$. Otherwise it stays put. Let $T$ be the number of rounds until the token reaches position 0. We show tight bounds for the expectation of $T$ for the optimal distribution $μ$. More precisely, we show that $\min_μ\{E_μ(T)\=Θ((\log n)^2)$. For the proof, a novel potential function argument is introduced. The research is motivated by the problem of approximating the minimum of a continuous function over $[0,1]$ with a ``blind'' optimization strategy.
Interface study of thermally driven chemical kinetics involved in Ti/Si3N4 based metal-substrate assembly by X-ray photoelectron spectroscopy
Creators: name: Yadav, Sachin
name: Sahoo, Sangeeta
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Diffusion mediated interaction in metal-substrate assembly during high temperature annealing leads to possible formation of new composite materials. Here, sputtered grown Ti films on Si3N4/Si substrate has been reported to produce titanium nitride and silicide based binary composites while undergoing high vacuum annealing process at temperatures 650°C and above. Diffusion of thermally decomposed Si and N atoms from Si3N4 and their subsequent chemical reaction with Ti have been probed by X-ray photo electron spectroscopy. For annealing at 800°C and above, most of the Si atoms show preferences to stay in elemental form rather than developing silicide phase with Ti. Whereas at lower annealing temperature, silicide becomes the dominant phase for decomposed Si atoms. However, N atoms react promptly with Ti and form TiN which appears as the majority phase for each of the studied annealing temperature. Further, the nitride and silicide phases across the films have been compared quantitatively for various annealing temperature and the maximum silicide formation is observed for the sample annealed at 780°C. Finally, the thermally anchored metal-substrate interaction mechanism can be exploited to fabricate disordered superconducting TiN films where TiSi2 and Si can be used to tune the level of disorder by altering the annealing temperature.
An introduction to research and innovation policy for regional growth
Creators: name: Kelleher, Leonard
name: Ulrichsen, Tomas
Publisher: name: University Commercialisation and Innovation Policy Evidence Unit, University of Cambridge
Year: 2025
Subjects: Knowledge exchange
Regional growth
Innovation policy

description: The UK exhibits amongst the highest interregional productivity inequalities in the industrialised world. A consensus has emerged in recent years across consecutive governments that improving national economic growth depends on increasing the economic performance of cities and towns outside London and the Southeast. To assist policymakers in this area, this report discusses the theories and practical approaches to regionally focused R&I policy, drawing both on established good practices and emerging thinking in policy design and implementation in the US and EU, and the current UK government’s mission-led approach.
On combinatorial optimization for dominating sets (literature survey, new models)
Creators: name: Levin, Mark Sh.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Artificial Intelligence (cs.AI)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: C.2.2; D.2.2; G.2.3; I.2.8; I.5.3; J.6; K.4.3
subject: 68T20, 68M12, 94C30, 90B50, 93A13, 93B51

description: The paper focuses on some versions of connected dominating set problems: basic problems and multicriteria problems. A literature survey on basic problem formulations and solving approaches is presented. The basic connected dominating set problems are illustrated by simplifyed numerical examples. New integer programming formulations of dominating set problems (with multiset estimates) are suggested.
description: 17 pages, figures 6, table 5
Integrability of Three Dimensional Gravity Field Equations
Creators: name: Gurses, Metin
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that the tree dimensional Einstein vacuum field equations with cosmological constant are integrable. Using the $sl(2,R)$ valued soliton connections we obtain the metric of the spacetime in terms of the dynamical variables of the integrable nonlinear partial differential equations.
description: A contribution to Tekin Dereli's 70th birthday Fetstschrift (DERELI-FS-2021)
The Impact of Multiple Parallel Phrase Suggestions on Email Input and Composition Behaviour of Native and Non-Native English Writers
Creators: name: Buschek, Daniel
name: Zürn, Martin
name: Eiband, Malin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences
subject: H.5.2; I.2.7

description: We present an in-depth analysis of the impact of multi-word suggestion choices from a neural language model on user behaviour regarding input and text composition in email writing. Our study for the first time compares different numbers of parallel suggestions, and use by native and non-native English writers, to explore a trade-off of "efficiency vs ideation", emerging from recent literature. We built a text editor prototype with a neural language model (GPT-2), refined in a prestudy with 30 people. In an online study (N=156), people composed emails in four conditions (0/1/3/6 parallel suggestions). Our results reveal (1) benefits for ideation, and costs for efficiency, when suggesting multiple phrases; (2) that non-native speakers benefit more from more suggestions; and (3) further insights into behaviour patterns. We discuss implications for research, the design of interactive suggestion systems, and the vision of supporting writers with AI instead of replacing them.
description: 21 pages, 4 figures, ACM CHI 2021
Curvature-driven AC-assisted creep dynamics of magnetic domain walls
Creators: name: Domenichini, P.
name: Paris, F. N.
name: Capeluto, M. G.
name: Granada, M.
name: George, J. -M.
name: Pasquini, G.
name: Kolton, A. B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The dynamics of micrometer-sized magnetic domains in ultra-thin ferromagnetic films is so dramatically slowed down by quenched disorder that the spontaneous elastic tension collapse becomes unobservable at ambient temperature. By magneto-optical imaging we show that a weak zero-bias AC magnetic field can assist such curvature-driven collapse, making the area of a bubble to reduce at a measurable rate, in spite of the negligible effect that the same curvature has on the average creep motion driven by a comparable DC field. An analytical model explains this phenomenon quantitatively.
description: 5 pages, 3 figures. Ancillary Material included
Inhomogeneous ferromagnetism mimics signatures of the topological Hall effect in SrRuO$_3$ films
Creators: name: Kim, Gideok
name: Son, K.
name: Suyolcu, Y. E.
name: Miao, L.
name: Schreiber, N. J.
name: Nair, H. P.
name: Putzky, D.
name: Minola, M.
name: Christiani, G.
name: van Aken, P. A.
name: Shen, K. M.
name: Schlom, D. G.
name: Logvenov, G.
name: Keimer, B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Topological transport phenomena in magnetic materials are a major topic of current condensed matter research. One of the most widely studied phenomena is the ``topological Hall effect'' (THE), which is generated via spin-orbit interactions between conduction electrons and topological spin textures such as skyrmions. We report a comprehensive set of Hall effect and magnetization measurements on epitaxial films of the prototypical ferromagnetic metal SrRuO$_3$ the magnetic and transport properties of which were systematically modulated by varying the concentration of Ru vacancies. We observe Hall effect anomalies that closely resemble signatures of the THE, but a quantitative analysis demonstrates that they result from inhomogeneities in the ferromagnetic magnetization caused by a non-random distribution of Ru vacancies. As such inhomogeneities are difficult to avoid and are rarely characterized independently, our results call into question the identification of topological spin textures in numerous prior transport studies of quantum materials, heterostructures, and devices. Firm conclusions regarding the presence of such textures must meet stringent conditions such as probes that couple directly to the non-collinear magnetization on the atomic scale.
To Live Up to Our Name "Greenland": Politics of Comparison in Greenland's Green Transition
Creators: name: Rastad Bjørst, Lill
Publisher: name: Zenodo
Year: 2022

description: In 2021, the Government of Greenland made an active, discursive shift in the political discourse regarding Greenlandic development. Since the last general election, the political agenda has changed from prioritizing industrialization and the development of extractive industries (with little focus on ratifying international treaties and commitments to lower CO2 emissions to limit global warming) to suddenly wanting to “live up to our name, Greenland” by kickstarting a green transition with the ambition to be an exporter of hydropower and mining rare earth elements (REE) to support the technology for the green transition. At the time of writing, Greenland has no formal climate strategy for the country or a strategy for green energy transition. Analyzing collected data (presentations at COP26 and the related notes, videos, reports, and statements) is therefore the best way to understand Greenland’s up-to-date priorities related to the green transition and position in the international climate change debate. Greenland lacks a nicely sealed package of peers and keeps on searching for other nation-states to get inspiration. Therefore, the following research question is posed: To whom (or what) does Greenland compare itself to in the process of finding a fitting model for future green development? The reading strategy for this article is inspired by the politics of comparison with the act of comparing and producing categories as the object of study.
Holographic Grand Unification
Creators: name: Nomura, Yasunori
name: Poland, David
name: Tweedie, Brock
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: We present a framework for grand unification in which the grand unified symmetry is broken spontaneously by strong gauge dynamics, and yet the physics at the unification scale is described by (weakly coupled) effective field theory. These theories are formulated, through the gauge/gravity correspondence, in truncated 5D warped spacetime with the UV and IR branes setting the Planck and unification scales, respectively. In most of these theories, the Higgs doublets arise as composite states of strong gauge dynamics, corresponding to degrees of freedom localized to the IR brane, and the observed hierarchies of quark and lepton masses and mixings are explained by the wavefunction profiles of these fields in the extra dimension. We present several realistic models in this framework. We focus on one in which the doublet-triplet splitting of the Higgs fields is realized within the dynamical sector by the pseudo-Goldstone mechanism, with the associated global symmetry corresponding to a bulk gauge symmetry in the 5D theory. Alternatively, the light Higgs doublets can arise as a result of dynamics on the IR brane, without being accompanied by their triplet partners. Gauge coupling unification and proton decay can be studied in these models using higher dimensional effective field theory. The framework also sets a stage for further studies of, e.g., proton decay, fermion masses, and supersymmetry breaking.
description: 29 pages, references added
Discrete Jordan Curve Theorem: A proof formalized in Coq with hypermaps
Creators: name: Dufourd, Jean-François
Publisher: name: arXiv
Year: 2008
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences

description: This paper presents a formalized proof of a discrete form of the Jordan Curve Theorem. It is based on a hypermap model of planar subdivisions, formal specifications and proofs assisted by the Coq system. Fundamental properties are proven by structural or noetherian induction: Genus Theorem, Euler's Formula, constructive planarity criteria. A notion of ring of faces is inductively defined and a Jordan Curve Theorem is stated and proven for any planar hypermap.
Herschel-ATLAS Data Release III: Near-infrared counterparts in the South Galactic Pole field -- Another 100,000 submillimetre galaxies
Creators: name: Ward, B. A.
name: Eales, S. A.
name: Pons, E.
name: Smith, M. W. L.
name: McMahon, R. G.
name: Dunne, L.
name: Ivison, R. J.
name: Maddox, S. J.
name: Negrello, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In this paper we present the third data release (DR3) of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). We identify likely near-infrared counterparts to submillimetre sources in the South Galactic Pole (SGP) field using the VISTA VIKING survey. We search for the most probable counterparts within 15 arcsec of each Herschel source using a probability measure based on the ratio between the likelihood the true counterpart is found close to the submillimetre source and the likelihood that an unrelated object is found in the same location. For 110 374 (57.0$\%$) sources we find galaxies on the near-infrared images where the probability that the galaxy is associated to the source is greater than 0.8. We estimate the false identification rate to be 4.8$\%$, with a probability that the source has an associated counterpart on the VIKING images of 0.835$\pm$0.009. We investigate the effects of gravitational lensing and present 41 (0.14 deg$^{-2}$) candidate lensed systems with observed flux densities > 100 mJy at 500 $μ$m. We include in the data release a probability that each source is gravitationally lensed and discover an additional 5 923 sources below 100 mJy that have a probability greater than 0.94 of being gravitationally lensed. We estimate that $\sim$ 400 - 1 000 sources have multiple true identifications in VIKING based on the similarity of redshift estimates for multiple counterparts close to a Herschel source. The data described in this paper can be found at the H-ATLAS website.
description: 16 pages, 13 figures, accepted for publication in MNRAS