cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Grundy domination of forests and the strong product conjecture
Creators: name: Bell, Kayla
name: Driscoll, Keith
name: Krop, Elliot
name: Wolff, Kimber
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C69, 05C76

description: A maximum sequence $S$ of vertices in a graph $G$, so that every vertex in $S$ has a neighbor which is independent, or is itself independent, from all previous vertices in $S$, is called a Grundy dominating sequence. The Grundy domination number, $γ_{gr}(G)$, is the length of $S$. We show that for any forest $F$, $γ_{gr}(F)=|V(T)|-|\mathcal{P}|$ where $\mathcal{P}$ is a minimum partition of the non-isolate vertices of $F$ into caterpillars in which if two caterpillars of $\mathcal{P}$ have an edge between them in $F$, then such an edge must be incident to a non-leaf vertex in at least one of the caterpillars. We use this result to show the strong product conjecture of B. Brešar, Cs. Bujtás, T. Gologranc, S. Klavžar, G. Košmrlj, B. Patkós, Zs. Tuza, and M. Vizer, Dominating sequences in grid-like and toroidal graphs, Electron. J. Combin. 23(4): P4.34 (2016), for all forests. Namely, we show that for any forest $G$ and graph $H$, $γ_{gr}(G \boxtimes H) = γ_{gr}(G) γ_{gr}(H)$. We also show that every connected graph $G$ has a spanning tree $T$ so that $γ_{gr}(G)\le γ_{gr}(T)$ and that every non-complete connected graph contains a Grundy dominating set $S$ so that the induced subgraph of $S$ contains no isolated vertices.
description: 17 pages
Direct Estimation of Single- and Two-Qubit Hamiltonians and Relaxation Rates
Creators: name: Mohseni, M.
name: Rezakhani, A. T.
name: Aspuru-Guzik, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We provide a novel approach for characterization of quantum Hamiltonian systems via utilizing a single measurement device. Specifically, we demonstrate how external quantum correlations can be used for Hamiltonian identification tasks. We explicitly introduce experimental procedures for direct estimation of single- and two-qubit Hamiltonian parameters, and also for simultaneous estimation of transverse and longitudinal relaxation rates, using a single Bell-state analyzer. An advantage of our method over the earlier approaches is that it has a built-in feature which makes it suitable for partial characterization of Hamiltonian parameters.
description: 5 pages, published version
Nephtyidae Grube 1850
Creators: name: Ribas, Julia
name: Hutchings, Pat
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Phyllodocida
Nephtyidae

description: Family Nephtyidae Grube, 1850   See Murray et al. (2015, Zootaxa 4019).
description: Published as part of Ribas, Julia & Hutchings, Pat, 2015, Lizard Island Polychaete Workshop: sampling sites and a checklist of polychaetes, pp. 7-34 in Zootaxa 4019 (1) on page 27, DOI: 10.11646/zootaxa.4019.1.4, http://zenodo.org/record/289472
Army service and social mobility : the Mahars of the Bombay Presidency, with comparisions with the Bene Israel and Black Americans
Creators: name: Basham, Ardythe Maude Roberta
Publisher: name: University of British Columbia
Year: 2010

description: A number of historians have asserted that military service has been an avenue of social mobility for disadvantaged peoples in multicultural societies but few detailed investigations support this assertion. This thesis does so by describing the relationship between army service and social mobility in the case of the Mahars, an untouchable community of Western India, who are compared with the Bene Israel, an Indian Jewish community, and black Americans. The thesis describes and analyses the similarities and differences in the social status and military experiences of each community, and assesses the impact of military service on their social and economic situations. The Mahars and the Bene Israel served in the Indian Army up to 1893, when both groups were declared ineligible for enlistment. The reasons for this, and the struggle of the Mahars to regain their military eligibility, are examined and compared with the relevant period for American blacks, the century from the United States Civil War to the beginnings of the Civil Rights movement in the 1950s. Comparative military pay and benefits, the general effects of racial and caste prejudice, the "Martial Races" theory, the relationship between military service and citizenship, and the status of soldiers in their non-military environments are discussed at length in order to support the thesis that the Mahars benefited most from military service. They received economic benefits, educational opportunities, leadership experience, enhanced social status, and improved access to official channels. Consequently, they periodically agitated for restoration of the right to enlist, something they did not finally achieve until 1942. The Bene Israel had no racial or caste stigma to overcome, and were least affected by the loss of military employment. Accordingly, they made little effort to regain enlistment status. While American blacks derived similar benefits, these were not of crucial importance for improvement of the position of the entire black population; military service was, however, important in justifying claims to political equality. Whites reinforced their dominance with pseudo-scientific beliefs in their innate racial superiority which they used to limit the participation of the Mahars and blacks in the military. But recognition as soldiers had symbolic as well as practical value in strengthening the claims of Mahars and blacks to equal status in other areas. Primary sources used for the thesis include government documents from the National Archives of India, the Maharashtra State Archives, the United Services Institution of India, and the India Office Library. Regimental and other military histories, interviews, and a variety of cultural history sources, as well as the standard monographic materials, have also been used.
Success of digital adiabatic simulation with large Trotter step
Creators: name: Yi, Changhao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The simulation of adiabatic evolution has deep connections with Adiabatic Quantum Computation, the Quantum Approximate Optimization Algorithm and adiabatic state preparation. Here we address the error analysis problem in quantum simulation of adiabatic process using Trotter formulas. We show that with additional conditions, the circuit depth can be linear in simulation time $T$. The improvement comes from the observation that the fidelity error here can't be estimated by the norm distance between evolution operators. This phenomenon is termed as the robustness of discretization in digital adiabatic simulation. It can be explained in three steps, from analytical and numerical evidence: (1). The fidelity error should be estimated by applying adiabatic theorem on the effective Hamiltonian instead. (2). Because of the specialty of Riemann-Lebesgue lemma, most adiabatic process is naturally robust against discretization. (3). As the Trotter step gets larger, the spectral gap of effective Hamiltonian tends to close, which results in the failure of digital adiabatic simulation.
Nereididae Blainville 1818
Creators: name: Ribas, Julia
name: Hutchings, Pat
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Phyllodocida
Nereididae

description: Family Nereididae Blainville, 1818   See Glasby (2015, Zootaxa 4019).
description: Published as part of Ribas, Julia & Hutchings, Pat, 2015, Lizard Island Polychaete Workshop: sampling sites and a checklist of polychaetes, pp. 7-34 in Zootaxa 4019 (1) on page 27, DOI: 10.11646/zootaxa.4019.1.4, http://zenodo.org/record/289472
Learning of Content Knowledge and Development of Scientific Reasoning Ability: A Cross Culture Comparison
Creators: name: Bao, Lei
name: Fang, Kai
name: Cai, Tianfang
name: Wang, Jing
name: Yang, Lijia
name: Cui, Lili
name: Han, Jing
name: Ding, Lin
name: Luo, Ying
Publisher: name: arXiv
Year: 2008
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: Student content knowledge and general reasoning abilities are two important areas in education practice and research. However, there hasn't been much work in physics education that clearly documents the possible interactions between content learning and the development of general reasoning abilities. In this paper, we report one study of a systematic research to investigate the possible interactions between students' learning of physics content knowledge and the development of general scientific reasoning abilities. Specifically, this study seeks to answer the research question of whether and to what extent content learning may affect the development of general reasoning abilities. College entrance testing data of freshman college students in both USA and China were collected using three standardized tests, FCI, BEMA, and Lawson's Classroom Test of Scientific Reasoning (Lawson Test). The results suggest that years of rigorous training of physics knowledge in middle and high schools have made significant impact on Chinese students' ability in solving physics problems, while such training doesn't seem to have direct effects on their general ability in scientific reasoning, which was measured to be at the same level as that of the students in USA. Details of the curriculum structures in the education systems of USA and China are also compared to provide a basis for interpreting the assessment data.
description: To appear in AJP
Finite-temperature infinite matter with effective-field-theory-inspired energy-density functionals
Creators: name: Burrello, Stefano
name: Grasso, Marcella
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Finite-temperature infinite matter is analyzed with the recently introduced effective-fieldtheory(EFT)-inspired YGLO (Yang-Grasso-Lacroix-Orsay) and ELYO (extended Lee-Yang, Orsay) functionals, which are designed to describe very low-density regimes in symmetric (YGLO) and in pure neutron (YGLO and ELYO) matter. The article deals with neutron matter and aims to verify whether the use of these functionals allows us to correctly incorporate finite-temperature effects. We compare our results for some relevant thermodynamical quantities with the corresponding ones computed with a chosen reference ab-initio model, namely the many-body-perturbation-theory scheme. We validate the reliability of both EFT-inspired functionals at least at rather low densities and not too high temperatures and we discuss the effects related to the effective mass. We conclude that, at the present stage, the ELYO functional, having a higher neutron effective mass around saturation (closer to ab-initio values), allows us to describe finite-temperature properties more satisfactorily, in better agreement with ab-initio predictions up to higher densities and temperatures, compared to YGLO.
description: 11 pages, 7 figures
Bootstrapping Dirac Ensembles
Creators: name: Hessam, Hamed
name: Khalkhali, Masoud
name: Pagliaroli, Nathan
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Operator Algebras (math.OA)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 58B34, 81Sxx, 05Axx

description: We apply the bootstrap technique to find the moments of certain multi-trace and multi-matrix random matrix models suggested by noncommutative geometry. Using bootstrapping we are able to find the relationships between the coupling constant of these models and their second moments. Using the Schwinger-Dyson equations, all other moments can be expressed in terms of the coupling constant and the second moment. Explicit relations for higher mixed moments are obtained.
description: 4 figures, 17 pages. The introduction is extended, new references are added. The rest did not change. To appear in J. Phys. A: Math. Theor
Magnetism of competing high-spin/low-spin states in Ba$_2$NiO$_2$(AgSe)$_2$ and related two-orbital two-electron systems
Creators: name: Singh, Rajiv R. P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We discuss the thermodynamic and magnetic properties of a competing high-spin/low-spin two-orbital two-electron model on a square-lattice possibly relevant to the nickelates such as Ba$_2$NiO$_2$(AgSe)$_2$ (BNOAS). We focus on parameter regimes where a high-spin ($S=1$) and a low-spin ($S=0$) state are energetically close to each other and discuss various exchange processes in such a system. The model we study is a variant of, but different from the Kondo-necklace model proposed for the system by Jin et al (H. S. Jin, W. E. Pickett and K. W. Lee, Phys. Rev. Research 2, 033197 (2020)). Although there are similarities between the two models in terms of the ground-state phases and their symmetries, the detailed properties of the different phases and the phase transitions are entirely different and should be easy to distinguish from an experimental point of view.
description: 6 pages, 5 figures
Discovery of inward moving magnetic enhancements in sunspot penumbrae
Creators: name: Zhang, Jun
name: Solanki, S.
name: Woch, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Sunspot penumbrae show a fine structure in continuum intensity that displays considerable dynamics. The magnetic field, in contrast, although also highly structured, has appeared to be relatively static. Here we report the discovery of inward moving magnetic enhancements in the penumbrae of two regular sunspots based on time series of SOHO/MDI magnetograms. Local enhancements of the LOS component of the magnetic field in the inner part of the penumbral region move inward to the umbra-penumbra boundary with a radial speed of about 0.3 km s$^{-1}$. These local inward-moving enhancements of the LOS component of the magnetic fields appear to be relatively common. They are associated with dark structures and tend to display downflows relatively to the penumbral background. Possible explanations are discussed.
description: 4 pages, 4 figures, submitted to ApJ Letters
Onuphidae Kinberg 1865
Creators: name: Ribas, Julia
name: Hutchings, Pat
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Eunicida
Onuphidae

description: Family Onuphidae Kinberg, 1865   See Paxton & Budaeva (2015, Zootaxa 4019) for a new subgenus of Rhamphobrachium.
Currently no other published records of this family from Lizard Island.
description: Published as part of Ribas, Julia & Hutchings, Pat, 2015, Lizard Island Polychaete Workshop: sampling sites and a checklist of polychaetes, pp. 7-34 in Zootaxa 4019 (1) on page 27, DOI: 10.11646/zootaxa.4019.1.4, http://zenodo.org/record/289472
Opheliidae Malmgren 1867
Creators: name: Ribas, Julia
name: Hutchings, Pat
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Opheliidae

description: Family Opheliidae Malmgren, 1867   See Parapar & Moreira (2015, Zootaxa 4019, a) for the genus Armandia.
description: Published as part of Ribas, Julia & Hutchings, Pat, 2015, Lizard Island Polychaete Workshop: sampling sites and a checklist of polychaetes, pp. 7-34 in Zootaxa 4019 (1) on page 27, DOI: 10.11646/zootaxa.4019.1.4, http://zenodo.org/record/289472
Disformal map and Petrov classification in modified gravity
Creators: name: Achour, Jibril Ben
name: De Felice, Antonio
name: Gorji, Mohammad Ali
name: Mukohyama, Shinji
name: Pookkillath, Masroor C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Disformal transformation provides a map relating different scalar-tensor and vector-tensor theories and gives access to a powerful solution-generating method in modified gravity. In view of the vast family of new solutions one can achieve, it is crucial to design suitable tools to guide their construction. In this work, we address this question by revisiting the Petrov classification of disformally constructed solutions in modified gravity theories. We provide close formulas which relate the principal nulls directions as well as the Weyl scalars before and after the disformal transformation. These formulas allow one to capture if and how the Petrov type of a given seed geometry changes under a disformal transformation. Finally, we apply our general setup to three relevant disformally constructed solutions for which the seeds are respectively homogeneous and isotropic, static spherically symmetric and stationary axisymmetric. For the first two cases, we show that the Petrov type O and Petrov type D remain unchanged after a disformal transformation while we show that disformed Kerr black hole is no longer of type D but of general Petrov type I. The results presented in this work should serve as a new toolkit when constructing and comparing new disformal solutions in modified gravity.
description: 26+11 pages, 2 tables, matches the published version
Differences in perceptual abilities in gifted and non-gifted children as measured by the Macgregor perceptual index
Creators: name: Collier, Robyn Maree
Publisher: name: University of British Columbia
Year: 2010

description: Until about 1970, little was published on research pertaining to the influence of perceptual acuity in relation to gifted children. This study was undertaken to provide empirical data that might lead to a better understanding of such a relationship, to review research performed in the fields of both perception and giftedness, and to assess the usefulness of a non-verbal instrument for elementary teachers of art in diagnosing giftedness at a perceptual level. The study was designed to determine, by means of a perceptual index test, whether or not gifted children who display above average intellectual skills, also exhibit above average perceptual skills. The MacGregor Perceptual Index (MPI) was administered to a group of twenty-four gifted and twenty-six non-gifted children between the ages of ten and twelve years. Categories included:- perception of distance, perception of embedded figures, perception of shape, perception of similarities and differences, perception of the vertical, perception modified by constancy, and perception of contour. The investigation revealed similarities and differences among children of specific intellectual capacity and ages in how they perceive and interpret visual stimuli. It was found that children with above average intellectual ability performed at a higher level on the Perceptual Index test than did subjects drawn from an average group. The findings in this study led to recommendations for further investigation. The MPI, a non-verbal perceptual test, was judged to be a reliable instrument for diagnosing gifted children. In the synopsis of factors revealed in this study, it was concluded that there is a statistically significant relationship between perceptual ability and intellectual ability. The results of the study imply that training in perceptual problem-solving skills may generally enhance a child's intelligence level, and thus should be considered as part of the school curriculum.
Terahertz Meets Untrusted UAV-Relaying: Minimum Secrecy Energy Efficiency Maximization via Trajectory and Communication Co-design
Creators: name: Mamaghani, Milad Tatar
name: Hong, Yi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Networking and Internet Architecture (cs.NI)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Unmanned aerial vehicles (UAVs) and Terahertz (THz) technology are envisioned to play paramount roles in next-generation wireless communications. In this paper, we present a novel secure UAV-assisted mobile relaying system operating at THz bands for data acquisition from multiple ground user equipments (UEs) towards a destination. We assume that the UAV-mounted relay may act, besides providing relaying services, as a potential eavesdropper called the untrusted UAV-relay (UUR). To safeguard end-to-end communications, we present a secure two-phase transmission strategy with cooperative jamming. Then, we devise an optimization framework in terms of a new measure $-$ secrecy energy efficiency (SEE), defined as the ratio of achievable average secrecy rate to average system power consumption, which enables us to obtain the best possible security level while taking UUR's inherent flight power limitation into account. For the sake of quality of service fairness amongst all the UEs, we aim to maximize the minimum SEE (MSEE) performance via the joint design of key system parameters, including UUR's trajectory and velocity, communication scheduling, and network power allocation. Since the formulated problem is a mixed-integer nonconvex optimization and computationally intractable, we decouple it into four subproblems and propose alternative algorithms to solve it efficiently via greedy/sequential block successive convex approximation and non-linear fractional programming techniques. Numerical results demonstrate significant MSEE performance improvement of our designs compared to other known benchmarks.
description: 16 pages, 10 figures, Accepted by (to appear in) the IEEE Transactions on Vehicular Technology
Orbiniidae Hartman 1942
Creators: name: Ribas, Julia
name: Hutchings, Pat
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Orbiniida
Orbiniidae

description: Family Orbiniidae Hartman, 1942   See Zhadan et al. (2015, Zootaxa 4019).
description: Published as part of Ribas, Julia & Hutchings, Pat, 2015, Lizard Island Polychaete Workshop: sampling sites and a checklist of polychaetes, pp. 7-34 in Zootaxa 4019 (1) on page 27, DOI: 10.11646/zootaxa.4019.1.4, http://zenodo.org/record/289472
title: The Artist-Led Condition: Reframing Self-Organisation in the Visual Arts in the UK Post-2007
Creators: name: Schofield, J
Publisher: name: Liverpool John Moores University
Year: 2021

description: The term ‘artist-led’ has become commonly used as shorthand to describe cultural forms grounded in principles of self-organisation, largely as part of the ‘second economy’ of the globalised art system. The thesis critically explores this self-organisation by visual arts practitioners in the UK following the Financial Crisis (2007), arguing that the terminology itself is defunct. It proposes the ‘artist-led condition’ as a way to re-frame those self-organised practices, enabling a social and productive benefit to practitioners through a framework of collectivisation. One that acts as a composition of individuals acting in common rather than flattening differences into a homogenous mass, supporting them to be politically active in their own circumstances. Situated within a broader discourse on self-organisation in the visual arts and cultural resistance to neoliberal hegemony in times of austerity, the research addresses key questions relating to socio-economic conditions of practice; resistance to systems of social organisation and governance; and the impact of increased internet connectivity. Outlining how artist-led self-organisation has become established as the methodology for the majority of practitioners in the period post-2007, it explores how neoliberal power structures have shaped its development, perception and function, creating a paradoxical interdependence between two sides that inherently oppose one another. Through this paradoxical relationship critique is often recuperated by that system, with a small number of practitioners able to stage meaningful critique through utilising dynamic organisational forms. When viewing practitioners as a whole the subsequent need for further dynamic forms of resistance shows the complex and modulated potential to help bring about social change artist-led self-organisation possesses. The artist-led condition specifically supports this potential, allowing for the formation of networked and localised forms of resistance to neoliberal governance in solidarity with one another. Embracing the paradox of its own existence, the artist-led condition makes public the potential it holds as a site of both problems and opportunities to potentially utilise neoliberal hegemony as a tool to support self-organised resistance to it. The research outlines the practical and ideological parameters of it to demonstrate how it can be understood and function as a catalyst for new models of self-organisation and organisational structures to be created, or existing ones to be reformatted and repurposed for continued use. Re-framing the understanding of artist-led self-organisation to provide practitioners with a new framework of practice presenting new possibilities for social change.
Fisher's zeros of quasi-Gaussian densities of states
Creators: name: Denbleyker, A.
name: Du, D.
name: Meurice, Y.
name: Velytsky, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss apparent paradoxes regarding the location of the zeros of the partition function in the complex $β$ plane (Fisher's zeros) of a pure SU(2) lattice gauge theory in 4 dimensions. We propose a new criterion to draw the region of the complex $β$ plane where reweighting methods can be trusted when the density of states is almost but not exactly Gaussian. We propose new methods to infer the existence of zeros outside of this region. We demonstrate the reliability of these proposals with quasi Gaussian Monte Carlo distributions where the locations of the zeros can be calculated by independent numerical methods. The results are presented in such way that the methods can be applied for general lattice models. Applications to specific lattice models will be discussed in a separate publication.
description: 11 pages, 21 figures, with minor corrections
Transition-Region Velocity Oscillations Observed by EUNIS-06
Creators: name: Jess, D. B.
name: Rabin, D. M.
name: Thomas, R. J.
name: Brosius, J. W.
name: Mathioudakis, M.
name: Keenan, F. P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Spectroscopic measurements of AR NOAA 10871, obtained with the Extreme Ultraviolet Normal Incidence Spectrograph (EUNIS) sounding rocket instrument on 2006 April 12, reveal velocity oscillations in the He II 303.8 Angstrom emission line formed at T ~ 50000K. The oscillations appear to arise in a bright active-region loop arcade about 25" wide which crosses the EUNIS slit. The period of these transition region oscillations is 26 +/- 4 s, coupled with a velocity amplitude of +/- 10 km/s, detected over 4 complete cycles. Similar oscillations are observed in lines formed at temperatures up to T ~ 400000K, but we find no evidence for the coupling of these velocity oscillations with corresponding phenomena in the corona. We interpret the detected oscillations as originating from an almost purely adiabatic plasma, and infer that they are generated by the resonant transmission of MHD waves through the lower active-region atmospheres. Through use of seismological techniques, we establish that the observed velocity oscillations display wave properties most characteristic of fast-body global sausage modes.
description: 7 pages, 5 figures, accepted into ApJ
Integrable Spin Chain in Superconformal Chern-Simons Theory
Creators: name: Bak, Dongsu
name: Rey, Soo-Jong
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: N = 6 superconformal Chern-Simons theory was proposed as gauge theory dual to Type IIA string theory on AdS4*CP3. We study integrability of the theory from conformal dimension spectrum of single trace operators at planar limit. At strong `t Hooft coupling, the spectrum is obtained from excitation energy of free superstring on OSp(6|2,2)/SO(3,1)xSU(3)xU(1) supercoset. We recall that the worldsheet theory is integrable classically by utilizing well-known results concerning sigma model on symmetric space. With R-symmetry group SU(4), we also solve relevant Yang-Baxter equation for a spin chain system associated with the single trace operators. From the solution, we construct alternating spin chain Hamiltonian involving three-site interactions between 4 and 4*. At weak `t Hooft coupling, we study gauge theory perturbatively, and calculate action of dilatation operator to single trace operators up to two loops. To ensure consistency, we computed all relevant Feynman diagrams contributing to the dilatation opeator. We find that resulting spin chain Hamiltonian matches with the Hamiltonian derived from Yang-Baxter equation. We further study new issues arising from the shortest gauge invariant operators transforming as 15 and 1 under SU(4). We observe that `wrapping interactions' are present, compute the true spectrum and find that the spectrum agrees with prediction from supersymmetry. We also find that scaling dimension computed naively from alternating spin chain Hamiltonian coincides with the true spectrum. We solve Bethe ansatz equations for small number of excitations, and find indications of correlation between excitations of 4's and 4*'s and of nonexistence of mesonic (4 4*) bound-state.
description: 1+42 pages, 9 .eps figures, v3. notes added and typos corrected, discussions and references added
Oweniidae Rioja 1917
Creators: name: Ribas, Julia
name: Hutchings, Pat
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Sabellida
Oweniidae

description: Family Oweniidae Rioja, 1917   See Parapar & Moreira (2015, Zootaxa 4019, b) for the genus Owenia.
No records of other genera within this family from Lizard or the GBR.
description: Published as part of Ribas, Julia & Hutchings, Pat, 2015, Lizard Island Polychaete Workshop: sampling sites and a checklist of polychaetes, pp. 7-34 in Zootaxa 4019 (1) on page 27, DOI: 10.11646/zootaxa.4019.1.4, http://zenodo.org/record/289472
Learning the Lantern: Neural network applications to broadband photonic lantern modelling
Creators: name: Sweeney, David
name: Norris, Barnaby R. M.
name: Tuthill, Peter
name: Scalzo, Richard
name: Wei, Jin
name: Betters, Christopher H.
name: Leon-Saval, Sergio G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Photonic lanterns allow the decomposition of highly multimodal light into a simplified modal basis such as single-moded and/or few-moded. They are increasingly finding uses in astronomy, optics and telecommunications. Calculating propagation through a photonic lantern using traditional algorithms takes $\sim 1$ hour per simulation on a modern CPU. This paper demonstrates that neural networks can bridge the disparate opto-electronic systems, and when trained can achieve a speed-up of over 5 orders of magnitude. We show that this approach can be used to model photonic lanterns with manufacturing defects as well as successfully generalising to polychromatic data. We demonstrate two uses of these neural network models, propagating seeing through the photonic lantern as well as performing global optimisation for purposes such as photonic lantern funnels and photonic lantern nullers.
description: 20 pages, 14 figures
TYC 1031 01262 1: The First Known Galactic Eclipsing Binary with a Type II Cepheid Component
Creators: name: Antipin, S. V.
name: Sokolovsky, K. V.
name: Ignatieva, T. I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the discovery and CCD observations of the first eclipsing binary with a Type II Cepheid component in our Galaxy. The pulsation and orbital periods are found to be 4.1523 and 51.38 days, respectively, i.e. this variable is a system with the shortest orbital period among known Cepheid binaries. Pulsations dominate the brightness variations. The eclipses are assumed to be partial. The EB-subtype eclipsing light curve permits to believe that the binary's components are non-spherical.
description: 3 pages, 3 figures, accepted to MNRAS Letters
A new proof of Vazsonyi's conjecture
Creators: name: Swanepoel, Konrad J
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 52C10 (Primary). 05C10 (Secondary)

description: We present a self-contained proof that the number of diameter pairs among n points in Euclidean 3-space is at most 2n-2. The proof avoids the ball polytopes used in the original proofs by Grunbaum, Heppes and Straszewicz. As a corollary we obtain that any three-dimensional diameter graph can be embedded in the projective plane.
description: 4 pages
Self-organized Natural Roads for Predicting Traffic Flow: A Sensitivity Study
Creators: name: Jiang, Bin
name: Zhao, Sijian
name: Yin, Junjun
Publisher: name: arXiv
Year: 2008
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: In this paper, we extended road-based topological analysis to both nationwide and urban road networks, and concentrated on a sensitivity study with respect to the formation of self-organized natural roads based on the Gestalt principle of good continuity. Both Annual Average Daily Traffic (AADT) and Global Positioning System (GPS) data were used to correlate with a series of ranking metrics including five centrality-based metrics and two PageRank metrics. It was found that there exists a tipping point from segment-based to road-based network topology in terms of correlation between ranking metrics and their traffic. To our big surprise, (1) this correlation is significantly improved if a selfish rather than utopian strategy is adopted in forming the self-organized natural roads, and (2) point-based metrics assigned by summation into individual roads tend to have a much better correlation with traffic flow than line-based metrics. These counter-intuitive surprising findings constitute emergent properties of self-organized natural roads, which are intelligent enough for predicting traffic flow, thus shedding substantial insights into the understanding of road networks and their traffic from the perspective of complex networks. Keywords: topological analysis, traffic flow, phase transition, small world, scale free, tipping point
description: 23 pages, 16 figures
Pectinariidae Quatrefages 1866
Creators: name: Ribas, Julia
name: Hutchings, Pat
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Terebellida
Pectinariidae

description: Family Pectinariidae Quatrefages, 1866   See Wong & Hutchings (2015, Zootaxa 4019).
description: Published as part of Ribas, Julia & Hutchings, Pat, 2015, Lizard Island Polychaete Workshop: sampling sites and a checklist of polychaetes, pp. 7-34 in Zootaxa 4019 (1) on page 28, DOI: 10.11646/zootaxa.4019.1.4, http://zenodo.org/record/289472
On the effects of the Initial Mass Function on Galactic chemical enrichment
Creators: name: Goswami, S.
name: Slemer, A.
name: Marigo, P.
name: Bressan, A.
name: Silva, L.
name: Spera, M.
name: Boco, L.
name: Grisoni, V.
name: Pantoni, L.
name: Lapi, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: There is mounting evidence that the stellar initial mass function (IMF) could extend much beyond the canonical Mi ~100, Msun limit, but the impact of such hypothesis on the chemical enrichment of galaxies still remains to be clarified. We aim to address this question by analysing the observed abundances of thin- and thick-disc stars in the Milky Way with chemical evolution models that account for the contribution of very massive stars dying as pair-instability supernovae. We built new sets of chemical yields from massive and very massive stars up to Mi ~ 350 Msun, by combining the wind ejecta extracted from our hydrostatic stellar evolution models with explosion ejecta from the literature. Using a simple chemical evolution code we analyse the effects of adopting different yield tables by comparing predictions against observations of stars in the solar vicinity. After several tests, we focus on the [O/Fe] ratio which best separates the chemical patterns of the two Milky Way components. We find that with a standard IMF, truncated at Mi ~ 100 Msun, we can reproduce various observational constraints for thin-disc stars, but the same IMF fails to account for the [O/Fe] ratios of thick-disc stars. The best results are obtained by extending the IMF up to Mi = 350 Msun and including the chemical ejecta of very massive stars, in the form of winds and pair-instability supernova explosions.Our study indicates that PISN played a significant role in shaping the chemical evolution of the Milky Way thick disc. By including their chemical yields it is easier to reproduce not only the level of the alpha-enhancement but also the observed slope of thick-disc stars in the [O/Fe] vs [Fe/H] diagram. The bottom line is that the contribution of very massive stars to the chemical enrichment of galaxies is potentially quite important and should not be neglected in chemical evolution models.
description: 29 pages, 17 figures, accepted for publication in A&A
High-Resolution Studies of the Multiple-Core Systems toward Cluster-Forming Regions Including Massive Stars
Creators: name: Saito, Hiro
name: Saito, Masao
name: Yonekura, Yoshinori
name: Nakamura, Fumitaka
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of C18O observations by the Nobeyama Millimeter Array toward dense clumps with radii of ~ 0.3 pc in six cluster-forming regions including massive (proto)stars. We identified 171 cores, whose radius, line width, and molecular mass range from 0.01 to 0.09 pc, 0.43 to 3.33 km/s, and 0.5 to 54.1 Mo, respectively. Many cores with various line widths exist in one clump, and the index of the line width-radius relationship of the cores and the parental clump differs from core to core in the clump. This indicates that the degree of dissipation of the turbulent motion varies for each core in one clump. Although the mass of the cores increases with the line width, most cores are gravitationally bound by the external pressure. In addition, the line width and the external pressure of the cores tend to decrease with the distance from the center of the clump, and these dependencies may be caused by the inner H2 density structure of the clump that affects the physical properties of the cores. Moreover, the number density of the cores and the number density of young (proto)stars have a similar relationship to the average H2 density of the clumps. Thus, our findings suggest that the cluster is formed in the clump through the formation of such multiple cores, whose physical properties would have been strongly related to the H2 density structure and the turbulent motion of the clump.
description: 39 page, 13 figures, accepted for publication in ApJS
A comparative study of the cell surface and the mechanism of macromolecule internalization in three phytoflagellates
Creators: name: De Andrade Alves De Sá Klut, Maria Emilia
Publisher: name: University of British Columbia
Year: 2010

description: A cytocheraical investigation on the cell surface of three phytoflagellates, one chlorophyte, Dunaliella tertiolecta and two dinoflagellates, Amphidinium carterae and Prorocentrum roicans showed that they all possess an anionic and heterogenous oligosaccharide coat on the external side of the plasma membrane. Studies with lectins gave clues to the nature of the sugar residues of their glycoconjugates. In particular, they may contain N-acetylglucosamine and/ or sialic acid, N-acetylgalactosamine and D-mannose or glucose. Among other properties, the carbohydrate moieties of the cell surface components were found to play an important role in cell recognition, cell to cell adhesion and in endocytosis. All three phytoflagellates were able to internalize macromolecules such as horseradish peroxidase, cationized ferritin, lectins and lectin-colloidal gold conjugates. In Dunaliella pinocytosis was observed for the first time, and was found to occur in the vicinity of the flagella, away from the cup-shaped chloroplast. During fluid-phase and adsorptive endocytosis, macromolecules were trapped within uncoated or coated pits and then delivered, via endosomes, to the lysosomal system. The reverse process of metabolic secretion as part of membrane recycling is also described. In Prorocentrumf exogenous macromolecules were internalized via surface pores, while in Amphidinium the ligands were taken in by plasma membrane-derived vesicles with subsequent incorporation into the peripheral cytoplasmic vacuole. In both dinoflagellates, the major site of macromolecule internalization was the flagellar canal-pusule system. Morphological and morphometric studies on Prorocentrum showed pusule size changes in response to different levels of salinity and temperature. A three-dimensional model of Amphidinium pusule is proposed based on sequential sections. It is suggested that a fibrillar collar system in conjunction with the flagellar-beating plays an important role in regulating the flow of materials in and out of the pusule. It appears that the pusule is a complex structure involved in osmoregulation, cellular uptake and possibly secretion. With regard to the relationship between the ultrastructure of the cell covering and the mechanism of endocytosis, two hypothetical evolutionary lines are suggested, one includes those organisms such as Dunaliella, amoeba and some other protozoa that lack a rigid cell wall and a specialized compartment for macromolecule internalization; the other comprises those forms such as dinoflagellates, cryptomonads, euglenoids and some kinetidal protozoa that possess a complex cell covering and a specific compartment for macromolecule uptake.
Meta-Stable Brane Configurations with Seven NS5-Branes
Creators: name: Ahn, Changhyun
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present the intersecting brane configurations consisting of NS-branes, D4-branes(and anti D4-branes) and O6-plane, of type IIA string theory corresponding to the meta-stable nonsupersymmetric vacua in four dimensional N=1 supersymmetric SU(N_c) x SU(N_c') x SU(N_c'') gauge theory with a symmetric tensor field, a conjugate symmetric tensor field and bifundamental fields. We also describe the intersecting brane configurations of type IIA string theory corresponding to the nonsupersymmetric meta-stable vacua in the above gauge theory with an antisymmetric tensor field, a conjugate symmetric tensor field, eight fundamental flavors and bifundamentals. These brane configurations consist of NS-branes, D4-branes(and anti D4-branes), D6-branes and O6-planes.
description: 34pp, 9 figures; Improved the draft and added some footnotes; Figure 1, footnote 7 and captions of Figures 7,8,9 added or improved and to appear in CQG
Two-dimensional charge density wave TaX$_2$ (X=S, Se, Te) from first principles
Creators: name: Jiang, Tao
name: Hu, Tao
name: Zhao, Guodong
name: Li, Yongchang
name: Xu, Shaowen
name: Liu, Chao
name: Cui, Yaning
name: Ren, Wei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Transition metal dichalcogenides are rich in their structural phases, e.g. 1T-TaS2 and 1T-TaSe2 form charge density wave (CDW) under low temperature with interesting and exotic properties. Here, we present a systematic study of different structures in two-dimensional TaX2 (X=S, Se, Te) using density functional theory calculations with consideration of van der Waals interaction. All the normal phases present metal characteristics with various ground state and magnetic properties. The lattice reconstruction of CDW drastically affects the electronic and structural characteristics of 1T-TaS2 and 1T-TaSe2, leading to a transition from metal to insulator and an emergence of magnetic moment within periodic atomic clusters called the Star of David. The evaluated Heisenberg couplings indicate the weak ferromagnetic coupling between the clusters in monolayer. Furthermore, in bilayer commensurate CDW cases, we find intriguing phenomenon of the varying magnetic properties with different stacking orders. The magnetic moment in each layer disappears when two layers are coupled, but may sustain in certain stackings of interlayer antiferromagnetic configurations.
title: Vertebral Artery Dissection - An important cause of stroke in younger patients
Creators: name: Tsang, Brian
Publisher: name: EURORAD
Year: 2021
Subjects: subject: Neuroradiology
subject: Anatomy
subject: Arteries / Aorta
subject: Head and neck
subject: CT
subject: MR-Angiography
subject: Aneurysms
subject: Clinical Cases

description: Clinical History: A 47-year-old male presented with sudden onset right eye vision loss, right-sided weakness and vomiting lasting 5 minutes with no past medical history. Arriving at the hospital 30 minutes later, his symptoms appeared to have resolved. He never smoked, worked in a supply chain and is independently mobile.

description: 47 years, male