cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Relationship among identified problem areas, choice of helpers, and sex-role differentiation in grade eleven students
Creators: name: Joy, Peter W.
Publisher: name: University of British Columbia
Year: 2010

description: This research study investigates, with a group of 181 grade eleven students, the relationships among a number of self-reported variables: identified problems, disclosure likelihood on these problems, and choice of helper. Students, grouped by biological sex and psychological sex-role orientation (Bern, 1978), were asked by means of a two-part questionnaire the extent to which each of eleven problem topics was a problem for them (Part I of the study), how likely they would be to talk about each of the problem topics, and with whom (Part II of the study). In Part I of the study, both the main effect for identified problem and the interaction between identified problem and sex of student were significant, though sex of student was not significant. When students were grouped by psychological sex-role orientation, only the main effect for identified problem was significant. In the second and larger part of the study, there were significant main effects and lower order interactions with regards to biological sex and psychological sex-role orientation of the discloser, gender and location of the helper, and the problem topic to be talked about. What is most notable, however, is the number of significant higher order interactions which indicate the complexity of conditionality for self-disclosure. This is to say that the subjects in this study report that the degree of their self-disclosure depends specifically on who they are in terms of their biological sex and psychological sex-role orientation, what the topic is, and to whom they are disclosing. The antecedents of self-disclosure are varied and complex.
Young giants of intermediate mass Evidence of rotation and mixing
Creators: name: Lombardo, Linda
name: François, Patrick
name: Bonifacio, Piercarlo
name: Caffau, Elisabetta
name: Pinto, A. Matas
name: Charbonnel, Corinne
name: Meynet, Georges
name: Monaco, Lorenzo
name: Cescutti, Gabriele
name: Mucciarelli, Alessio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In the search of a sample of metal-poor bright giants using Str{ö}mgren photometry, we serendipitously found a sample of 26 young (ages younger than 1 Gyr) metal-rich giants, some of which have high rotational velocities.We determined the chemical composition and rotational velocities of these stars in order to compare them with predictions from stellar evolution models. These stars where of spectral type A to B when on the main sequence, and we therefore wished to compare their abundance pattern to that of main-sequence A and B stars.Stellar masses were derived by comparison of the position of the stars in the colour-magnitude diagram with theoretical evolutionary tracks. These masses, together with Gaia photometry and parallaxes, were used to derive the stellar parameters. We used spectrum synthesis and model atmospheres to determine chemical abundances for 16 elements (C, N, O, Mg, Al, Ca, Fe, Sr, Y, Ba, La, Ce, Pr, Nd, Sm, and Eu) and rotational velocities.The age-metallicity degeneracy can affect photometric metallicity calibrations. We identify 15 stars as likely binary stars. All stars are in prograde motion around the Galactic centre and belong to the thin-disc population. All but one of the sample stars present low [C/Fe] and high [N/Fe] ratios together with constant [(C+N+O)/Fe], suggesting that they have undergone CNO processing and first dredge-up. The observed rotational velocities are in line with theoretical predictions of the evolution of rotating stars.
description: Astronomy and Astrophysics - A\&A, EDP Sciences, 2021
Additional file 1 of The role of aircraft noise annoyance and noise sensitivity in the association between aircraft noise levels and medication use: results of a pooled-analysis from seven European countries
Creators: name: Baudin, Clémence
name: Lefèvre, Marie
name: Babisch, Wolfgang
name: Cadum, Ennio
name: Champelovier, Patricia
name: Dimakopoulou, Konstantina
name: Houthuijs, Danny
name: Lambert, Jacques
name: Laumon, Bernard
name: Pershagen, Göran
name: Stansfeld, Stephen
name: Velonaki, Venetia
name: Hansell, Anna L.
name: Evrard, Anne-Sophie
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Neuroscience
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer
subject: Science Policy

description: Additional file 1:. Supplementary Tables.
Experimental realization of highly-efficient broadband coupling of single quantum dots to a photonic crystal waveguide
Creators: name: Lund-Hansen, T.
name: Stobbe, S.
name: Julsgaard, B.
name: Thyrrestrup, H.
name: Sünner, T.
name: Kamp, M.
name: Forchel, A.
name: Lodahl, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present time-resolved spontaneous emission measurements of single quantum dots embedded in photonic crystal waveguides. Quantum dots that couple to the photonic crystal waveguide are found to decay up to 27 times faster than uncoupled quantum dots. From these measurements $β$-factors of up to 0.89 are derived, and an unprecedented large bandwidth of 20 nm is demonstrated. This shows the promising potential of photonic crystal waveguides for efficient single-photon sources. The scaled frequency where the enhancement is observed is in excellent agreement with theory taking into account that the light-matter coupling is strongly enhanced due to the significant slow-down of light in the photonic crystal waveguide.
description: 4 pages, 4 figures, submitted to PRL
Nonclassical dynamics of Bose condensates in an optical lattice in the superfluid regime
Creators: name: Franzosi, Roberto
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: A condensate in an optical lattice, prepared in the ground state of the superfluid regime, is stimulated first by suddenly increasing the optical lattice amplitude and then, after a waiting time, by abruptly decreasing this amplitude to its initial value. Thus the system is first taken to the Mott regime and then back to the initial superfluid regime. We show that, as a consequence of this nonadiabatic process, the system falls into a configuration far from equilibrium whose superfluid order parameter is described in terms of a particular superposition of Glauber coherent states that we derive. We also show that the classical equations of motion describing the time evolution of this system are inequivalent to the standard discrete nonlinear Schreodinger equations. By numerically integrating such equations with several initial conditions, we show that the system loses coherence, becoming insulating.
description: 5 pages, 4 figures
Effective Hamiltonian of Three-orbital Hubbard Model on Pyrochlore Lattice: Application to LiV_2O_4
Creators: name: Hattori, Kazumasa
name: Tsunetsugu, Hirokazu
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate heavy fermion behaviors in the vanadium spinel LiV_2O_4. We start from a three-orbital Hubbard model on the pyrochlore lattice and derive its low-energy effective Hamiltonian by an approach of real-space renormalization group type. One important tetrahedron configuration in the rochlore lattice has a three-fold orbital degeneracy and spin S=1, and correspondingly, the effective Hamiltonian has spin and orbital exchange interactions of Kugel-Khomskii type as well as correlated electron hoppings. Analyzing the effective Hamiltonian, we find that ferromagnetic double exchange processes compete with antiferromagnetic superexchange processes and various spin and orbital exchange processes are competing to each other. These results suggest the absence of phase transition in spin and orbital spaces down to very low temperatures and their large fluctuations in the low-energy sector, which are key issues for understanding the heavy fermion behavior in LiV_2O_4.
description: 26 pages, 26 figures
Collective Charge Excitations below the Metal-to-Insulator Transition in BaVS3
Creators: name: Ivek, T.
name: Vuletic, T.
name: Tomic, S.
name: Akrap, A.
name: Berger, H.
name: Forro, L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The charge response in the barium vanadium sulfide (BaVS3) single crystals is characterized by dc resistivity and low frequency dielectric spectroscopy. A broad relaxation mode in MHz range with huge dielectric constant ~= 10^6 emerges at the metal-to-insulator phase transition TMI ~= 67 K, weakens with lowering temperature and eventually levels off below the magnetic transition Tchi ~= 30 K. The mean relaxation time is thermally activated in a manner similar to the dc resistivity. These features are interpreted as signatures of the collective charge excitations characteristic for the orbital ordering that gradually develops below TMI and stabilizes at long-range scale below Tchi.
description: 6 pages, 3 figures, submitted to PRB
Consequences of a Pati-Salam unification of the electroweak-scale active $ν_R$ model
Creators: name: Hung, P. Q.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: If right-handed neutrinos are {\em not} singlets under the electroweak gauge group as it was proposed in a recent model, they can acquire electroweak scale masses and are thus accessible experimentally in the near future. When this idea is combined with quark-lepton unification à la Pati-Salam, one is forced to introduce new neutral particles which are singlets under the Standard Model (SM). These "sterile neutrinos" which exist in both helicities and which are different in nature from the popular particles with the same name can have their own seesaw with masses in the keV range for the lighter of the two eigenstates. The keV sterile neutrinos have been discussed in the literature as warm dark matter candidates with wide ranging astrophysical consequences such as structure formation, supernova asymetries, pulsar kicks, etc..In addition, the model contains W-like and Z-like heavy gauge bosons which might be accessible at the LHC or the ILC. An argument is presented on why, in this model, it is natural to have four families which can obey existing constraints.
description: 19 double-column pages, RevTex. Streamlined version to appear in Nucl. Phys. B
Observation of Quantum Capacitance of individual single walled carbon nanotubes
Creators: name: Dai, Junfeng
name: Li, Jun
name: Zeng, Hualing
name: Cui, Xiaodong
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report a measurement on quantum capacitance of individual semiconducting and small band gap SWNTs. The observed quantum capacitance is remarkably smaller than that originating from density of states and it implies a strong electron correlation in SWNTs.
Negotiation of ethical principles and procedures in case study evaluation : the Humanities Curriculum Project and the Success and Failure and Recent Innovation Project
Creators: name: Bath, Stephen William
Publisher: name: University of British Columbia
Year: 2010

description: This thesis reports on the methodology and the use of the case study by educational researchers associated with the Centre for Applied Research in Education (CARE) in the University of East Anglia. The role of negotiation in establishing certain key principles and procedures when case studying the CARE group's Humanities Curriculum Project (HCP) and Success and Failure and Recent Innovation Project (SAFARI) led to the development of a 'SAFARI ethic' This ethic was a response to issues confronting an approach to evaluation derived from the alternative 'illuminative' paradigm of educational research. A conceptual analysis of the issues and strategies dealt with when developing this alternative evaluation approach reveals a fundamental problem. The SAFARI ethic is shown to lack a principle of justice without which the relationship between the other two fundamental principles of confidentiality and the right to know is inimical.
Shaping Individualized Impedance Landscapes for Gait Training via Reinforcement Learning
Creators: name: Zhang, Yufeng
name: Li, Shuai
name: Nolan, Karen J.
name: Zanotto, Damiano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Assist-as-needed (AAN) control aims at promoting therapeutic outcomes in robot-assisted rehabilitation by encouraging patients' active participation. Impedance control is used by most AAN controllers to create a compliant force field around a target motion to ensure tracking accuracy while allowing moderate kinematic errors. However, since the parameters governing the shape of the force field are often tuned manually or adapted online based on simplistic assumptions about subjects' learning abilities, the effectiveness of conventional AAN controllers may be limited. In this work, we propose a novel adaptive AAN controller that is capable of autonomously reshaping the force field in a phase-dependent manner according to each individual's motor abilities and task requirements. The proposed controller consists of a modified Policy Improvement with Path Integral algorithm, a model-free, sampling-based reinforcement learning method that learns a subject-specific impedance landscape in real-time, and a hierarchical policy parameter evaluation structure that embeds the AAN paradigm by specifying performance-driven learning goals. The adaptability of the proposed control strategy to subjects' motor responses and its ability to promote short-term motor adaptations are experimentally validated through treadmill training sessions with able-bodied subjects who learned altered gait patterns with the assistance of a powered ankle-foot orthosis.
description: in IEEE Transactions on Medical Robotics and Bionics, 2022
Experiments on the twisted vortex state in superfluid 3He-B
Creators: name: Eltsov, V. B.
name: de Graaf, R.
name: Hanninen, R.
name: Krusius, M.
name: Solntsev, R. E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We have performed measurements and numerical simulations on a bundle of vortex lines which is expanding along a rotating column of initially vortex-free 3He-B. Expanding vortices form a propagating front: Within the front the superfluid is involved in rotation and behind the front the twisted vortex state forms, which eventually relaxes to the equilibrium vortex state. We have measured the magnitude of the twist and its relaxation rate as function of temperature above 0.3Tc. We also demonstrate that the integrity of the propagating vortex front results from axial superfluid flow, induced by the twist.
description: prepared for proceedings of the QFS2007 symposium in Kazan
Regularity of the Radon-Nikodym Derivative of a Convolution of Orbital Measures on Noncompact Symmetric Spaces
Creators: name: Anchouche, Boudjemaa
Publisher: name: arXiv
Year: 2021
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: {43A85, 28C10, 43A77, 43A90, 53C35

description: Let $G/K$ be a Riemannian symmetric space of noncompact type, and let $ν_{a_j}$, $j=1,...,r$ be some orbital measures on $G$ (see the definition below). The aim of this paper is to study the $L^{2}$-regularity (resp. $C^k$-smoothness) of the Radon-Nikodym derivative of the convolution $ν_{a_{1}}\ast...\astν_{a_{r}}$ with respect to a fixed left Haar measure $μ_G$ on $G$. As a consequence of a result of Ragozin, \cite{ragozin}, we prove that if $r \geq \, \max_{1\leq i \leq s}\dim {G_i}/K_i$, then $ν_{a_{1}}\ast...\astν_{a_{r}}$ is absolutely continuous with respect to $μ_G$, i.e., $d\big(ν_{a_{1}}\ast...\astν_{a_{r}}\big)/dμ_G$ is in $L^1(G)$, where $G_i/K_i$, $i=1,...,s$, are the irreducible components in the de Rham decomposition of $G/K$. The aim of this paper is to prove that $d\big(ν_{a_{1}}\ast...\astν_{a_{r}}\big)/dμ_G$ is in $L^2(G)$ (resp. $C^k\left(G \right) $) for $r \geq \max_{1\leq i \leq s}\dim \left( {G_i}/{K_i}\right) + 1$\, (resp. $r \geq \max_{1\leq i \leq s} \dim\left( {G_i}/{K_i}\right) +k+1$). The case of a compact symmetric space of rank one was considered in \cite{AGP} and \cite{AG}, and the case of a complex Grassmannian was considered in \cite{AA}.
On the identification of individual gravitational wave image types of a lensed system using higher-order modes
Creators: name: Janquart, Justin
name: Seo, Eungwang
name: Hannuksela, Otto A.
name: Li, Tjonnie G. F.
name: Broeck, Chris Van Den
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Similarly to light, gravitational waves can be gravitationally lensed as they propagate near massive astrophysical objects such as galaxies, stars, or black holes. In recent years, forecasts have suggested a reasonable chance of strong gravitational-wave lensing detections with the LIGO-Virgo-KAGRA detector network at design sensitivity. As a consequence, methods to analyse lensed detections have seen rapid development. However, the impact of higher-order modes on the lensing analyses is still under investigation. In this work, we show that the presence of higher-order modes enables the identification of the individual images types for the observed gravitational wave events when two lensed images are detected, which would lead to unambiguous confirmation of lensing. In addition, we show that higher-order mode content can be analyzed more accurately with strongly lensed gravitational wave events.
description: 6 pages, 2 figures
Universal microscopic spectrum of the unquenched QCD Dirac operator at finite temperature
Creators: name: Akemann, Gernot
name: Würfel, Tim R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the $\varepsilon$-regime of chiral perturbation theory the spectral correlations of the Euclidean QCD Dirac operator close to the origin can be computed using random matrix theory. To incorporate the effect of temperature, a random matrix ensemble has been proposed, where a constant, deterministic matrix is added to the Dirac operator. Its eigenvalue correlation functions can be written as the determinant of a kernel that depends on temperature. Due to recent progress in this specific class of random matrix ensembles, featuring a deterministic, additive shift, we can determine the limiting kernel and correlation functions in this class, which is the class of polynomial ensembles. We prove the equivalence between this new determinantal representation of the microscopic eigenvalue correlation functions and existing results in terms of determinants of different sizes, for an arbitrary number of quark flavours, with and without temperature, and extend them to non-zero topology. These results all agree and are thus universal when measured in units of the temperature dependent chiral condensate, as long as we stay below the chiral phase transition.
description: 26 pages; v2: minor changes (reference added, typos corrected and some clarification), to appear in JHEP
Understanding the processes influencing supraglacial stream discharge on the Greenland ice sheet
Creators: name: Muthyala, Rohi
Publisher: name: No Publisher Supplied
Year: 2023

description: The Greenland ice sheet is one of the largest sources of cryospheric contribution to the global sea-level rise. The recent mass loss from the Greenland ice sheet is largely due to the increased meltwater runoff from the surface through supraglacial (on the top of the glacier) stream networks. Regional climate models are the primary tools for predicting Greenland’s contribution to sea-level rise; however, their validation is limited due to lack of in-situ observations of surface runoff through supraglacial stream networks. Moreover, these models do not capture the impact of some surface hydrological processes on runoff, leading to overestimation of modeled runoff from the ice sheet surface. This dissertation presents a novel data set that includes an unprecedented long record of stream discharge from a supraglacial catchment in southwest Greenland throughout almost an entire melt season. The study investigates stream discharge and its drivers while also examining how well the models simulate stream discharge. The results highlight the importance of meltwater routing through the dynamically changing stream network and temporary storage in the weathering crust for accurately modeling stream discharge. The research also reveals the sensitivity of stream discharge to sensible heat flux and albedo. This thesis shows that the regional climate/surface energy balance models are reasonably effective in simulating stream discharge near the ice margin of the ice sheet. However, to achieve high accuracy in modeled discharge, weathering crust needs to be considered as a model parameter to include density variations and subsurface storage in the weathering crust throughout the melt season in the ablation zone of the Greenland ice sheet. Furthermore, the thesis shows that even with coarser resolution models, large bias can be avoided as long as parameters such as ice fraction, elevation, and distance from the observation site remain representative of the site. This dissertation provides a deeper understanding of the factors driving surface runoff from the Greenland ice sheet and the performance of models in simulating it. The novel data presented in this study offers valuable information to improve the accuracy of regional climate/energy balance models, leading to better forecasting of Greenland’s contribution to sea-level rise.
Additional file 1 of Adapting evidence-informed population health interventions for new contexts: a scoping review of current practice
Creators: name: Movsisyan, A.
name: L. Arnold
name: L. Copeland
name: R. Evans
name: H. Littlecott
name: G. Moore
name: A. O’Cathain
name: L. Pfadenhauer
name: J. Segrott
name: E. Rehfuess
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Cancer
subject: Science Policy

description: Additional file 1. Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) Checklist.
Sources in the Weyl double copy
Creators: name: Easson, Damien A.
name: Manton, Tucker
name: Svesko, Andrew
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: The Weyl double copy relates exact solutions in general relativity to exact solutions in gauge theory, formulated in the spinorial language. To date, the Weyl double copy is understood and employed only for vacuum spacetimes, and hence only to vacuum gauge theories. In this letter, we propose an extension to the Weyl double copy that provides a systematic procedure for treating gravitational sources. We show this extended Weyl double copy gives a new perspective on the Kerr-Newman black hole and the general class of Petrov type D electro-vac spacetimes.
description: 5 pages, to appear in PRL
The Search for Extra Neutral Currents at the LHC: QCD and Anomalous Gauge Interactions
Creators: name: Armillis, Roberta
name: Coriano, Claudio
name: Guzzi, Marco
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Extensions of the Standard Model with extra neutral currents due to additional anomalous abelian gauge factors are considered. We summarize the main features of the effective action associated to these theories. They are characterized by an axion-like particle (the {\em axi-higgs}) which can be (almost) massless, with its mass generated non-perturbatively in the QCD vacuum as for an ordinary Peccei-Quinn axion, but that can also mix with the scalars of the Higgs sector, becoming a heavy axion. We briefly describe the interplay between the electroweak and the QCD sectors in these types of theories, which emerge either from special vacua of string/brane theory; from partial decoupling of a heavier fermion sector or from an anomaly inflow in the context of models with extra dimensions.
description: Talk given at QCD@work 2007, Martina Franca, Italy, 16-20 June 2007, 5 pages, 2 figures. To be published in the American Institute of Physics (AIP) conference proceedings
Elementary Excitations of a Bose-Einstein Condensate in an Effective Magnetic Field
Creators: name: Murray, D. R.
name: Öhberg, P.
name: Gomila, Damiá
name: Barnett, Stephen M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We calculate the low energy elementary excitations of a Bose-Einstein Condensate in an effective magnetic field. The field is created by the interplay between light beams carrying orbital angular momentum and the trapped atoms. We examine the role of the homogeneous magnetic field, familiar from studies of rotating condensates, and also investigate spectra for vector potentials with a more general radial dependence. We discuss the instabilities which arise and how these may be manifested.
description: 8 pages, 4 figures
D-term inflation after spontaneous symmetry breaking
Creators: name: Clauwens, Bart
name: Jeannerot, Rachel
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that 1-loop quantum corrections to the potential energy density in supersymmetric hybrid inflation, outside the inflationary valley, can not be neglected. A method is presented to calculate these 1-loop corrections and they are applied to the case of D-term hybrid inflation, where a significant amount of inflation is shown to occur after spontaneous symmetry breaking. Taking this into account improves the agreement with WMAP measurements. A gauge coupling of up to 0.3 is still consistent with the CMB density perturbation. The spectral index is predicted in between 0.98 and 1.00 and the cosmic string contribution to the CMB anisotropy is sufficiently reduced.
description: 45 pages
Additional file 2 of Adapting evidence-informed population health interventions for new contexts: a scoping review of current practice
Creators: name: Movsisyan, A.
name: L. Arnold
name: L. Copeland
name: R. Evans
name: H. Littlecott
name: G. Moore
name: A. O’Cathain
name: L. Pfadenhauer
name: J. Segrott
name: E. Rehfuess
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Cancer
subject: Science Policy

description: Additional file 2. Search strategy.
Effect of Co doping on superconductivity and transport properties in SmFe$_{1-x}$Co$_{x}$AsO
Creators: name: Li, Y. K.
name: Lin, X.
name: Zhu, Z. W.
name: Chen, H.
name: Wang, C.
name: Li, L. J.
name: Luo, Y. K.
name: He, M.
name: Tao, Q.
name: Li, H. Y.
name: Cao, G. H.
name: Xu, Z. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate superconductivity and transport properties of Co doped SmFe$_{1-x}$Co$_{x}$AsO system. The antiferromagnetic (AFM) spin-density wave (SDW) order is rapidly suppressed by Co doping, and superconductivity emerges as $x$ $\geq$ 0.05. $T_c$$^{mid}$ increases with increasing Co content, shows a maximum of 17.2 K at the optimally doping of $x\sim$ 0.10. A phase diagram is derived based on the transport measurements and a dome-like $T_c$ versus $x$ curve is established. Meanwhile we found that the normal state thermopower might consist of two different contributions. One contribution increases gradually with increasing $x$, and the other contribution is abnormally enhanced in the superconducting window 0.05 $\leq$ $x$ $\leq$ 0.20, and shows a dome-like doping dependence. A close correlation between $T_{c}$ and the abnormally enhanced term of thermopower is proposed.
description: 5 pages, 5 figures; data added and text revised. A combined version (this paper and arXiv:0807.1304) published in PRB
Formation and Characteristics of Filament Threads in Double-Dipped Magnetic Flux Tubes
Creators: name: Guo, Jinhan
name: Zhou, Yuhao
name: Guo, Yang
name: Ni, Yiwei
name: Karpen, Judy
name: Chen, Pengfei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: As one of the main formation mechanisms of solar filament formation, the chromospheric evaporation-coronal condensation model has been confirmed by numerical simulations to explain the formation of filament threads very well in flux tubes with single dips. However, coronal magnetic extrapolations indicated that some magnetic field lines might possess more than one dip. It is expected that the formation process would be significantly different in this case compared to a single-dipped magnetic flux tube. In this paper, based on the evaporation-condensation model, we study filament thread formation in double-dipped magnetic flux tubes by numerical simulations. We find that only with particular combinations of magnetic configuration and heating, e.g., concentrated localized heating and a long magnetic flux tube with deep dips, can two threads form and persist in a double-dipped magnetic flux tube. Comparing our parametric survey with observations, we conclude that such magnetically connected threads due to multiple dips are more likely to exist in quiescent filaments than in active-region filaments. Moreover, we find that these threads are usually shorter than independently trapped threads, which might be one of the reasons why quiescent filaments have short threads. These characteristics of magnetically connected threads could also explain barbs and vertical threads in quiescent filaments.
description: 43 pages, 13 figures, 4 tables. Accepted for publication in ApJ
Ophioglossaceae , Kessler & Smith 2017
Creators: name: Kessler, Michael
name: Smith, Alan R.
name: Øllgaard, Benjamin
name: Matos, Fernando B.
name: Moran, Robbin C.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Polypodiopsida
Ophioglossales
Ophioglossaceae

description: Ophioglossaceae   In their treatment of Bolivian Ophioglossaceae, Kessler & Smith (2017b) treated seven species in four genera, with Ophioglossum containing four species, including O. crotalophoroides. More recently, Zhang & Zhang (2022), based on a combination of molecular and morphological data, have proposed to split Ophioglossum into four genera including three new ones: Goswamia, Haukia, and Whittieria. Zhang and Zhang (2022) justified the separation of the new genera based on molecular divergence that is higher than among other genera currently recognized in the family, an early divergence age of over 100 Ma, and morphological distinctness. If accepted, O. crotalophoroides would belong to genus Haukia, However, the four genera together form a monophyletic clade, so that maintenance of Ophioglossum in a broader sense is also tenable. Further, some of the traits used to characterize the genera, such as preferences for certain soil types, or the spore germination time, appear weak to us. The segregation of the new genera has not yet been widely accepted (e.g., not by Hassler 2004 –2023), and we prefer to maintain the four Bolivian species in Ophioglossum for the time being.
description: Published as part of Kessler, Michael, Smith, Alan R., Øllgaard, Benjamin, Matos, Fernando B. & Moran, Robbin C., 2023, Prodromus of a fern flora of Bolivia. XLII. Update I., pp. 183-210 in Phytotaxa 630 (3) on page 192, DOI: 10.11646/phytotaxa.630.3.2, http://zenodo.org/record/10409920
Huge negative differential conductance in Au-H2 molecular nanojunctions
Creators: name: Halbritter, A.
name: Makk, P.
name: Csonka, Sz.
name: Mihaly, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Experimental results showing huge negative differential conductance in gold-hydrogen molecular nanojunctions are presented. The results are analyzed in terms of two-level system (TLS) models: it is shown that a simple TLS model cannot produce peaklike structures in the differential conductance curves, whereas an asymmetrically coupled TLS model gives perfect fit to the data. Our analysis implies that the excitation of a bound molecule to a large number of energetically similar loosely bound states is responsible for the peaklike structures. Recent experimental studies showing related features are discussed within the framework of our model.
description: 9 pages, 8 figures
Combination of quasiconvex subgroups of relatively hyperbolic groups
Creators: name: Martinez-Pedroza, Eduardo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20F65, 20F67

description: For relatively hyperbolic groups, we investigate conditions guaranteeing that the subgroup generated by two quasiconvex subgroups $Q$ and $R$ is quasiconvex and isomorphic to $Q \ast_{Q\cap R} R$. Our results generalized known combination theorems for quasiconvex subgroups of word-hyperbolic groups. Some applications are presented.
description: 25 pages, 12 figures. v2: Improved the exposition. Rewriting of parts due to referee's comments. Version to appear in "Groups, Geometry and Dynamics"
A comparison between two activity programmes and their effects upon physical fitness and attitude toward physical activity of grade 8 boys
Creators: name: Meachin, John Basford
Publisher: name: University of British Columbia
Year: 2010

description: The purposes of this study were as follows: To determine the effects of two fitness programmes (one comprising gym games activities, and the other comprising circuit training activities) on physical fitness and attitudes towards physical activity of grade 8 boys. It was hypothesized that: 1. There would be no significant difference in the effects of the two programmes on the physical fitness of grade 8 boys. 2. There would be no significant difference in the effects of the two programmes on the attitude toward physical activity of grade 8 boys when participating in programmes comprising either gym games or circuit training activities. The Canadian Association for Health, Physical Education and Recreation Test (C.A.H.P.E.R.) and the Children's Attitude Toward Physical Activity Test (C.A.T.P.A.) were administered to 44 grade 8 male physical education students at a high school in British Columbia. The data for the six physical fitness sub-tests (Sit-ups, Flexed Arm Hang, Standing Long Jump, 50 Metre Sprint and 2400 Metre Endurance Run) and the eight attitude sub-tests (Social (A), Social (B), Health and Fitness (A), Health and Fitness (B), Vertigo, Aesthetic, Catharsis and Ascetic) were analysed using a univariate analysis of variance. Results from this study showed that: 1. The gym games group made a significantly greater improvement, in four (Sit-up, Standing Long Jump, 50 Metre Sprint, and 2400 Metre Endurance Run) of the six C.A.H.P.E.R. sub-tests than the circuit training group. 2. The Circuit Training group made a significantly greater improvement in two (Flexed Arm Hang, and Shuttle Run) of the six C.A.H.P.E.R. sub-tests than the gym games group. 3. A six week programme of gym games activities was followed by a significant deterioration in attitude in four (Social (A), Social (B), Health and Fitness (B), and Catharsis) of the eight C.A.T.P.A. sub-tests. 4. A six week programme of circuit training activities was followed by a significant deterioration in attitude in three (Health and Fitness (B), Aesthetic, and Acetic) of the eight C.A.T.P.A. sub-tests. A six week programme of either gym games or circuit training activities did not produce a significant change in attitude on the C.A.T.P.A. Vertigo sub-test.
Il sileno e Dioniso Un cratere campano con attore comico in costume
Creators: name: Rebaudo, Ludovico
Publisher: name: La Rivista di Engramma
Year: 2021
Subjects: Campanian Bell Krater
Laghetto
Caivano and Errera Painters
Satyr
Silenus
Dionysus
Ancient Greek Actor
Actors costume

description: Silenus, the elderly, white-haired and wild-looking satyr, is a popular figure in South Italian vase painting. The Museo di Antichità ‘J.J. Winckelmann’ of Trieste hosts a high-quality bell crater, manufactured in the Capuan workshop of the Laghetto, Caivano and Errera Painters. On the obverse a Silenus is in conversation with Dionysus. The details of the costume, footwear and face reveal that it is an actor wearing a costume.
Accelerating Branes and Brane Temperature
Creators: name: Russo, J. G.
name: Townsend, P. K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We define the local acceleration and jerk of a relativistic brane in an ambient spacetime, and construct from them a dimensionless parameter lambda that must be small for an interpretation of brane acceleration as local Unruh temperature. As examples, we discuss (i) open rotating branes, for which lambda>1 (ii) closed spherical branes expanding in Minkowski spacetime, for which lambda=0 when the worldvolume is either an Einstein static universe or de Sitter space, in which case the brane temperature equals the Gibbons-Hawking temperature, (iii) closed spherical branes in anti-de Sitter spacetime, for which a maximally symmetric worldvolume is anti-de Sitter, Minkowski or de Sitter according to whether the magnitude of the brane acceleration is less than, equal to or greater than a `critical' value, and (iv) the BTZ black hole, viewed as a membrane.
description: 32 pages, small corrections
Streamlined quantum computing with macronode cluster states
Creators: name: Walshe, Blayney W.
name: Alexander, Rafael N.
name: Menicucci, Nicolas C.
name: Baragiola, Ben Q.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Continuous-variable cluster states allow for fault-tolerant measurement-based quantum computing when used in tandem with the Gottesman-Kitaev-Preskill (GKP) encoding of a qubit into a bosonic mode. For quad-rail-lattice macronode cluster states, whose construction is defined by a fixed, low-depth beam splitter network, we show that a Clifford gate and GKP error correction can be simultaneously implemented in a single teleportation step. We give explicit recipes to realize the Clifford generating set, and we calculate the logical gate-error rates given finite squeezing in the cluster-state and GKP resources. We find that logical error rates of $10^{-2}$-$10^{-3}$, compatible with the thresholds of topological codes, can be achieved with squeezing of 11.9-13.7 dB. The protocol presented eliminates noise present in prior schemes and puts the required squeezing for fault tolerance in the range of current state-of-the-art optical experiments. Finally, we show how to produce distillable GKP magic states directly within the cluster state.
description: 16 pages, 2 figures, 2 tables
Impact of Uncertainties in the Cosmological Parameters on the Measurement of Primordial non-Gaussianity
Creators: name: Liguori, M.
name: Riotto, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the impact of cosmological parameters' uncertainties on estimates of the primordial NG parameter f_NL in local and equilateral models of non-Gaussianity. We show that propagating these errors increases the f_NL relative uncertainty by 16% for WMAP and 5 % for Planck in the local case, whereas for equilateral configurations the correction term are 14% and 4%, respectively. If we assume for local f_NL a central value of order 60, according to recent WMAP 5-years estimates, we obtain for Planck a final correction Δf_NL = 3. Although not dramatic, this correction is at the level of the expected estimator uncertainty for Planck, and should then be taken into account when quoting the significance of an eventual future detection. In current estimates of f_NL the cosmological parameters are held fixed at their best-fit values. We finally note that the impact of uncertainties in the cosmological parameters on the final f_NL error bar would become totally negligible if the parameters were allowed to vary in the analysis and then marginalized over.
description: 10 pages, 3 figures, submitted to Phys. Rev. D
Phase lapses in scattering through multi-electron quantum dots: Mean-field and few-particle regimes
Creators: name: Bertoni, Andrea
name: Goldoni, Guido
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show that the observed evolution of the transmission phase through multi-electron quantum dots with more than approximately ten electrons, which shows a universal (i.e., independent of N) as yet unexplained behavior, is consistent with an electrostatic model, where electron-electron interaction is described by a mean-field approach. Moreover, we perform exact calculations for an open 1D quantum dot and show that carrier correlations may give rise to a non-universal (i.e., N-dependent) behavior of the transmission phase, ensuing from Fano resonances, which is consistent with experiments with a few (N < 10) carriers. Our results suggest that in the universal regime the coherent transmission takes place through a single level while in the few-particle regime the correlated scattering state is determined by the number of bound particles.
description: 14 pages, 3 figures, RevTex4 preprint format, to appear in Phys. Rev. B
Bell's theorem as a signature of nonlocality: a classical counterexample
Creators: name: Matzkin, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: For a system composed of two particles Bell's theorem asserts that averages of physical quantities determined from local variables must conform to a family of inequalities. In this work we show that a classical model containing a local probabilistic interaction in the measurement process can lead to a violation of the Bell inequalities. We first introduce two-particle phase-space distributions in classical mechanics constructed to be the analogs of quantum mechanical angular momentum eigenstates. These distributions are then employed in four schemes characterized by different types of detectors measuring the angular momenta. When the model includes an interaction between the detector and the measured particle leading to ensemble dependencies, the relevant Bell inequalities are violated if total angular momentum is required to be conserved. The violation is explained by identifying assumptions made in the derivation of Bell's theorem that are not fulfilled by the model. These assumptions will be argued to be too restrictive to see in the violation of the Bell inequalities a faithful signature of nonlocality.
description: Extended manuscript. Significant changes
Breakdown of Landau Theory in Overdoped Cuprates near the Onset of Superconductivity
Creators: name: Ossadnik, M.
name: Honerkamp, C.
name: Rice, T. M.
name: Sigrist, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use the functional renormalization group to analyze the temperature dependence of the quasi-particle scattering rates in the two-dimensional Hubbard model below half-filling. Using a band structure appropriate to overdoped Tl2Ba2CuO(6+x) we find a strongly angle dependent term linearly dependent on temperature which derives from an increasing scattering vertex as the energy scale is lowered. This behavior agrees with recent experiments and confirms earlier conclusions on the origin of the breakdown of the Landau Fermi liquid near the onset of superconductivity.
description: 4 pages, 5 figures, typos corrected
Heat Transport in low-dimensional systems
Creators: name: Dhar, Abhishek
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Recent results on theoretical studies of heat conduction in low-dimensional systems are presented. These studies are on simple, yet nontrivial, models. Most of these are classical systems, but some quantum-mechanical work is also reported. Much of the work has been on lattice models corresponding to phononic systems, and some on hard particle and hard disc systems. A recently developed approach, using generalized Langevin equations and phonon Green's functions, is explained and several applications to harmonic systems are given. For interacting systems, various analytic approaches based on the Green-Kubo formula are described, and their predictions are compared with the latest results from simulation. These results indicate that for momentum-conserving systems, transport is anomalous in one and two dimensions, and the thermal conductivity kappa, diverges with system size L, as kappa ~ L^alpha. For one dimensional interacting systems there is strong numerical evidence for a universal exponent alpha =1/3, but there is no exact proof for this so far. A brief discussion of some of the experiments on heat conduction in nanowires and nanotubes is also given.
description: 78 pages, 25 figures, Review Article (revised version)