cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Spectral models for solar-scaled and alpha-enhanced stellar populations
Creators: name: Coelho, P.
name: Bruzual, G.
name: Charlot, S.
name: Weiss, A.
name: Barbuy, B.
name: Ferguson, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the first models allowing one to explore in a consistent way the influence of changes in the alpha-element-to-iron abundance ratio on the high-resolution spectral properties of evolving stellar populations. The models cover the wavelength range 300-1340nm at a resolution of FWHM=1AA, for metallicities in the range 0.005<=Z<=0.048 and stellar population ages 3 to 14 Gyr. These models are based on a recent library of synthetic stellar spectra and a new library of stellar evolutionary tracks, both computed for three different [Fe/H] (-0.5,0.0 and 0.2) and two different [alpha/Fe] (0.0 and 0.4). We expect our fully synthetic models to be primarily useful for evaluating the differential effect of changes in the alpha/Fe ratio on spectral properties such as broad-band colours and narrow spectral features. In addition, we assess the accuracy of absolute model predictions in two ways: first, by comparing the predictions of models for scaled-solar metal abundances [alpha/Fe]=0.0) to those of existing models based on libraries of observed stellar spectra; and secondly, by comparing the predictions of models for alpha-enhanced metal abundances ([alpha/Fe]=0.4) to observed spectra of massive early-type galaxies in the SDSS-DR4. We find that our models predict accurate strengths for those spectral indices that are strongly sensitive to the abundances of Fe and alpha elements. The predictions are less reliable for the strengths of other spectral features, such as those dominated by the abundances of C and N, as expected from the fact that the models do not yet allow one to explore the influence of these elements in an independent way. We conclude that our models are a powerful tool for extracting new information about the chemical properties of galaxies for which high-quality spectra have been gathered by modern surveys.
description: Minor changes in the text and some figures to match the published version. The definitive version is available at www.blackwell-synergy.com
Supplementary Information of Hybrid catalysts based on carbene anchored on inorganic supports with hierarchical porosity
Creators: name: Gianotti, Enrica
name: Miletto, Ivana
name: Ivaldi, Chiara
name: Paul, Geo
name: Marchese, Leonardo
name: Meazza, Marta
name: Rios, Ramon
name: Raja, Robert
Publisher: name: Zenodo
Year: 2019
Subjects: N-heterocyclic carbene; supports with hierarchical porosity; physico-chemical characterization

description: Supplementary Information of the Article "Hybrid catalysts based on carbene anchored on inorganic supports with hierarchical porosity"
Can You Trust Your Trust Measure?
Creators: name: Chita-Tegmark, Meia
name: Law, Theresa
name: Rabb, Nicholas
name: Scheutz, Matthias
Publisher: name: arXiv
Year: 2021
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Trust in human-robot interactions (HRI) is measured in two main ways: through subjective questionnaires and through behavioral tasks. To optimize measurements of trust through questionnaires, the field of HRI faces two challenges: the development of standardized measures that apply to a variety of robots with different capabilities, and the exploration of social and relational dimensions of trust in robots (e.g., benevolence). In this paper we look at how different trust questionnaires fare given these challenges that pull in different directions (being general vs. being exploratory) by studying whether people think the items in these questionnaires are applicable to different kinds of robots and interactions. In Study 1 we show that after being presented with a robot (non-humanoid) and an interaction scenario (fire evacuation), participants rated multiple questionnaire items such as "This robot is principled" as "Non-applicable to robots in general" or "Non-applicable to this robot". In Study 2 we show that the frequency of these ratings change (indeed, even for items rated as N/A to robots in general) when a new scenario is presented (game playing with a humanoid robot). Finally, while overall trust scores remained robust to N/A ratings, our results revealed potential fallacies in the way these scores are commonly interpreted. We conclude with recommendations for the development, use and results-reporting of trust questionnaires for future studies, as well as theoretical implications for the field of HRI.
description: 9 pages
The nature of the magnetic order in Ca3Co2O6
Creators: name: Agrestini, S.
name: Chapon, L. C.
name: Daoud-Aladine, A.
name: Schefer, J.
name: Gukasov, A.
name: Mazzoli, C.
name: Lees, M. R.
name: Petrenko, O. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present a detailed powder and single crystal neutron diffraction study of the spin chain compound Ca3Co2O6. Below 25 K, the system orders magnetically with a modulated partially disordered antiferromagnetic structure. We give a description of the magnetic interactions in the system which is consistent with this magnetic structure. Our study also reveals that the long-range magnetic order co-exists with a shorter range order with a correlation length scale of 180 A in the ab plane. Remarkably, on cooling, the volume of material exhibiting short range order increases at the expense of the long-range order.
description: 4 pages, submitted to Physical Review Letters
Vector spectropolarimetry of dark-cored penumbral filaments with Hinode
Creators: name: Rubio, L. R. Bellot
name: Tsuneta, S.
name: Ichimoto, K.
name: Katsukawa, Y.
name: Lites, B. W.
name: Nagata, S.
name: Shimizu, T.
name: Shine, R. A.
name: Suematsu, Y.
name: Tarbell, T. D.
name: Title, A. M.
name: Iniesta, J. C. del Toro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present spectropolarimetric measurements of dark-cored penumbral filaments taken with Hinode at a resolution of 0.3". Our observations demonstrate that dark-cored filaments are more prominent in polarized light than in continuum intensity. Far from disk center, the Stokes profiles emerging from these structures are very asymmetric and show evidence for magnetic fields of different inclinations along the line of sight, together with strong Evershed flows of at least 6-7 km/s. In sunspots closer to disk center, dark-cored penumbral filaments exhibit regular Stokes profiles with little asymmetries due to the vanishing line-of-sight component of the horizontal Evershed flow. An inversion of the observed spectra indicates that the magnetic field is weaker and more inclined in the dark cores as compared with the surrounding bright structures. This is compatible with the idea that dark-cored filaments are the manifestation of flux tubes carrying hot Evershed flows.
description: Accepted for publication in ApJ Letters. Use the Postscript version for high quality figures
Masner Miko & Deans ZooBank 2009, gen. n.
Creators: name: Miko, Istvan
name: Deans, Andrew
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ceraphronidae
Masner

description: Masner Mikó & Deans, gen. n. urn:lsid:zoobank.org:act: FC311FF2-E57A-4CB1-B524-A07228D60911 Figs 1A-4C, 4E, 5A-B; see also Morphbank 7 [collection 470970] Type species: Masner lubomirus Deans & Mikó, sp. n. by monotypy and current designation. Diagnosis. Masner gen. n. is distinguishable from all other Ceraphronoidea by three character states: the sensillar patch present on flagellomere 5 but absent from flagellomeres 6–9 (sf: Figs 5A, B), dorsally visible depression surrounding anterior part of the petiole and the irregular areolate sculpture of the dorsal cranium. It differs from all other Ceraphronidae in presence of pterostigma (sg: Fig 3A) and occipital depression (od: Fig. 1B). Masner gen. n. belongs to Ceraphronidae on the basis of the presence of calcar comb, absence of anterior mesotibial spur, uniramous anterior protibial spur (calcar), absence of anteriorly delimited narrow region of synsternite, presence of axillular setae and parossiculus fused with gonostipes and presence of Waterston's evaporatorium. Etymology. The new genus group name is the Latinized family name of Lubomír Masner, who discovered the unique character combination of Masner gen. n., the presence of pterostigma on the wing and lacking posterior apical mesotibial spur and presorted the specimens of the new genus. Gender is masculine.
description: Published as part of Miko, Istvan & Deans, Andrew, 2009, Masner, a new genus of Ceraphronidae (Hymenoptera, Ceraphronoidea) described using controlled vocabularies, pp. 127-153 in ZooKeys 20 (20) on page 134, DOI: 10.3897/zookeys.20.119, http://zenodo.org/record/576509
Thick braneworld model in nonmetricity formulation of general relativity and its stability
Creators: name: Fu, Qi-Ming
name: Zhao, Li
name: Xie, Qun-Ying
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper, we study the thick brane system in the so-called $f(Q)$ gravity, where the gravitational interaction was encoded by the nonmetricity $Q$ like scalar curvature $R$ in general relativity. With a special choice of $f(Q)=Q-b Q^n$, we find that the thick brane system can be solved analytically with the first-order formalism, where the complicated second-order differential equation is transformed to several first-order differential equations. Moreover, the stability of the thick brane system under tensor perturbation is also investigated. It is shown that the tachyonic states are absent and the graviton zero mode can be localized on the brane. Thus, the four-dimensional Newtonian potential can be recovered at low energy. Besides, the corrections of the massive graviton Kaluza-Klein modes to the Newtonian potential are also analyzed briefly.
Non-Abelian hydrodynamics and the flow of spin in spin-orbit coupled substances
Creators: name: Leurs, B. W. A.
name: Nazario, Z.
name: Santiago, D. I.
name: Zaanen, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Motivated by heavy ion collision experiments, we study the hydrodynamic properties of non-Abelian systems. These issues arise in condensed matter physics in the context of transport of spins in the presence of spin orbit coupling: the Pauli Hamiltonian governing the leading relativistic corrections in condensed matter systems can be rewritten in a language of SU(2) covariant derivatives, where the role of the non-Abelian gauge fields is taken by the physical electromagnetic fields. Taking a similar perspective as Jackiw and coworkers, we show that non-abelian hydrodynamical currents can be factored in a non-coherent 'classical' part, and a coherent part requiring macroscopic non-abelian quantum entanglement. Non-abelian flow being thus a much richer affair than familiar hydrodynamics, permits us to classify the various spin transport phenomena in in condensed matter physics in a unifying framework.In semiconductor spintronics, the absence of hydrodynamics is well known, but in our formulation it is directly associated with the fact that non-abelian currents are only covariantly conserved.We analyze the quantum mechanical single particle currents of relevance to mesoscopic transport with as highlight the Aharonov-Casher effect, where we demonstrate that the non-abelian transport structure renders it much more fragile than its abelian counterpart, the Aharonov-Bohm effect. We subsequently focus on spin flows protected by order parameters, of which the spin-spiral magnets and the spin superfluids are important examples. The surprising bonus is that the presence of an order parameter, being single-valued, restores hydrodynamics. We demonstrate a new effect: the trapping of electrical line charge, being the 'fixed frame' non-Abelian analogue of the familiar magnetic flux trapping by superconductors.
description: 23 pages, 7 figures
Evidence for a companion to BM Gem, a silicate carbon star
Creators: name: Izumiura, Hideyuki
name: Noguchi, Kunio
name: Aoki, Wako
name: Honda, Satoshi
name: Ando, Hiroyasu
name: Takada-Hidai, Masahide
name: Kambe, Eiji
name: Kawanomoto, Satoshi
name: Sadakane, Kozo
name: Sato, Bun'ei
name: Tajitsu, Akito
name: Tanaka, Wataru
name: Okita, Ki'ichi
name: Watanabe, Etsuji
name: Yoshida, Michitoshi
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Balmer and Paschen continuum emission as well as Balmer series lines of P Cygni-type profile from H_gamma through H_23 are revealed in the violet spectra of BM Gem, a carbon star associated with an oxygen-rich circumstellar shell (`silicate carbon star') observed with the high dispersion spectrograph (HDS) on the Subaru telescope. The blue-shifted absorption in the Balmer lines indicates the presence of an outflow, the line of sight velocity of which is at least 400 km s^-1, which is the highest outflow velocity observed to date in a carbon star. We argue that the observed unusual features in BM Gem are strong evidence for the presence of a companion, which should form an accretion disk that gives rise to both an ionized gas region and a high velocity, variable outflow. The estimated luminosity of ~0.2 (0.03-0.6) L_sun for the ionized gas can be maintained by a mass accretion rate to a dwarf companion of ~10^-8 M_sun yr^-1, while ~10^-10 M_sun yr^-1 is sufficient for accretion to a white dwarf companion. These accretion rates are feasible for some detached binary configurations on the basis of the Bond-Hoyle type accretion process. We concluded that the carbon star BM Gem is in a detached binary system with a companion of low mass and low luminosity. However, we are unable to determine whether this companion object is a dwarf or a white dwarf. The upper limits for binary separation are 210 AU and 930 AU for a dwarf and a white dwarf, respectively. We also note that the observed features of BM Gem mimic those of Mira (omi Cet), which may suggest actual similarities in their binary configurations and circumstellar structures.
description: 11 pages, 2 figures, 1 table, accepted for publication in ApJ
Realizing quantum nodes in space for cost-effective, global quantum communication: in-orbit results and next steps
Creators: name: Perumangatt, Chithrabhanu
name: Vergoossen, Tom
name: Lohrmann, Alexander
name: Sivasankaran, Srihari
name: Reezwana, Ayesha
name: Anwar, Ali
name: Sachidananda, Subash
name: Islam, Tanvirul
name: Ling, Alexander
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Quantum sources and receivers operating on-board satellites are an essential building block for global quantumnetworks. SpooQy-1 is a satellite developed at the Centre for Quantum Technologies, which has successfully demonstrated the operation of an entangled photon pair source on a resource-constrained CubeSat platform. This miniaturized and ruggedized photon pair source is being upgraded to be capable of space-to-ground quantum keydistribution and long-range entanglement distribution. In this paper, we share results from SpooQy-1, discuss their relevance for the engineering challenges of a small satellite quantum node, and report on the development of the new light source.
description: 15 pages, 13 figures and 2 tables
Long nuclear spin decay times controlled by optical pumping in individual quantum dots
Creators: name: Makhonin, M. N.
name: Tartakovskii, A. I.
name: Drouzas, I.
name: Van'kov, A. B.
name: Wright, T.
name: Skiba-Szymanska, J.
name: Russell, A.
name: Fal'ko, V. I.
name: Skolnick, M. S.
name: Liu, H. -Y.
name: Hopkinson, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Nuclear polarization dynamics are measured in the nuclear spin bi-stability regime in a single optically pumped InGaAs/GaAs quantum dot. The controlling role of nuclear spin diffusion from the dot into the surrounding material is revealed in pump-probe measurements of the non-linear nuclear spin dynamics. We measure nuclear spin decay times in the range 0.2-5 sec, strongly dependent on the optical pumping time. The long nuclear spin decay arises from polarization of the material surrounding the dot by spin diffusion for long (>5sec) pumping times. The time-resolved methods allow the detection of the unstable nuclear polarization state in the bi-stability regime otherwise undetectable in cw experiments.
description: 4 pages, 3 figures, submitted to PRL
Parametric instabilities of large-amplitude parallel propagating Alfven waves: 2-D PIC simulation
Creators: name: Nariyuki, Yasuhiro
name: Matsukiyo, Shuichi
name: Hada, Tohru
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss the parametric instabilities of large-amplitude parallel propagating Alfven waves using the 2-D PIC simulation code. First, we confirmed the results in the past study [Sakai et al, 2005] that the electrons are heated due to the modified two stream instability and that the ions are heated by the parallel propagating ion acoustic waves. However, although the past study argued that such parallel propagating longitudinal waves are excited by transverse modulation of parent Alfven wave, we consider these waves are more likely to be generated by the usual, parallel decay instability. Further, we performed other simulation runs with different polarization of the parent Alfven waves or the different ion thermal velocity. Numerical results suggest that the electron heating by the modified two stream instability due to the large amplitude Alfven waves is unimportant with most parameter sets.
description: submitted to New journal of Physics
The Effect of Stool Design on Sitting Postural Control in Older and Young Adults
Creators: name: Ademiluyi, Adeolu
Publisher: name: University of Illinois at Chicago
Year: 2024

description: Effective balance control while performing daily activities in sitting is an important component of everyday life of many older adults. The ability of older adults to withstand external perturbations declines with age in both sitting and standing positions. While previous research has shed light on older adult’s balance maintenance in standing, limited evidence exists for sitting balance. Therefore, the focus of this dissertation was on the investigation of anticipatory and compensatory postural adjustments in sitting balance control of young and older adults. Moreover, we sought to determine the role of stool design and aging in the presence of external perturbations. First, we demonstrated that seated older adults exposed to frontal or lateral body perturbations showed diminished ability to generate anticipatory postural adjustments compared to young adults, regardless of seat inclination, availability of leg support, or directions of perturbation. Second, we demonstrated that irrespective of the direction of perturbation, young adults utilized reciprocal activation of muscle while older adults largely utilized co-activation of muscles as their main mechanism of postural control. The outcome of the dissertation provides evidence that sitting older adults have diminished ability to generate anticipatory postural adjustments. This dissertation also provides a background for future investigation of sitting postural control in older adults.
WEBT and XMM-Newton observations of 3C 454.3 during the post-outburst phase. Detection of the little and big blue bumps
Creators: name: Raiteri, C. M.
name: Villata, M.
name: Larionov, V. M.
name: Pursimo, T.
name: Ibrahimov, M. A.
name: Nilsson, K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The blazar 3C 454.3 underwent an unprecedented optical outburst in spring 2005. This was first followed by a mm and then by a cm radio outburst, which peaked in February 2006. We report on follow-up observations by the WEBT to study the multiwavelength emission in the post-outburst phase. XMM-Newton observations on July and December 2006 added information on the X-ray and UV fluxes. The source was in a faint state. The radio flux at the higher frequencies showed a fast decreasing trend, which represents the tail of the big radio outburst. It was followed by a quiescent state, common at all radio frequencies. In contrast, moderate activity characterized the NIR and optical light curves, with a progressive increase of the variability amplitude with increasing wavelength. We ascribe this redder-when-brighter behaviour to the presence of a "little blue bump" due to line emission from the broad line region, which is clearly visible in the source SED during faint states. Moreover, the data from the XMM-Newton OM reveal a rise of the SED in the UV, suggesting the existence of a "big blue bump" due to thermal emission from the accretion disc. The X-ray spectra are well fitted with a power-law model with photoelectric absorption, possibly larger than the Galactic one. However, the comparison with previous X-ray observations would imply that the amount of absorbing matter is variable. Alternatively, the intrinsic X-ray spectrum presents a curvature, which may depend on the X-ray brightness. In this case, two scenarios are possible.
description: 9 pages, 7 figures, accepted for publication in A&A
Rational points on certain elliptic surfaces
Creators: name: Ulas, Maciej
Publisher: name: arXiv
Year: 2007
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: Let $\mathcal{E}_{f}:y^2=x^3+f(t)x$, where $f\in\Q[t]\setminus\Q$, and let us assume that $\op{deg}f\leq 4$. In this paper we prove that if $\op{deg}f\leq 3$, then there exists a rational base change $t\mapstoϕ(t)$ such that on the surface $\cal{E}_{f\circϕ}$ there is a non-torsion section. A similar theorem is valid in case when $\op{deg}f=4$ and there exists $t_{0}\in\Q$ such that infinitely many rational points lie on the curve $E_{t_{0}}:y^2=x^3+f(t_{0})x$. In particular, we prove that if $\op{deg}f=4$ and $f$ is not an even polynomial, then there is a rational point on $\cal{E}_{f}$. Next, we consider a surface $\cal{E}^{g}:y^2=x^3+g(t)$, where $g\in\Q[t]$ is a monic polynomial of degree six. We prove that if the polynomial $g$ is not even, there is a rational base change $t\mapstoψ(t)$ such that on the surface $\cal{E}^{g\circψ}$ there is a non-torsion section. Furthermore, if there exists $t_{0}\in\Q$ such that on the curve $E^{t_{0}}:y^2=x^3+g(t_{0})$ there are infinitely many rational points, then the set of these $t_{0}$ is infinite. We also present some results concerning diophantine equation of the form $x^2-y^3-g(z)=t$, where $t$ is a variable.
description: 16 pages. Submitted for publication
Freezing distributed entanglement in spin chains
Creators: name: D'Amico, Irene
name: Lovett, Brendon W.
name: Spiller, Timothy P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show how to freeze distributed entanglement that has been created from the natural dynamics of spin chain systems. The technique that we propose simply requires single-qubit operations and isolates the entanglement in specific qubits at the ends of branches. Such frozen entanglement provides a useful resource, for example for teleportation or distributed quantum processing. The scheme can be applied to a wide range of systems -- including actual spin systems and alternative qubit embodiments in strings of quantum dots, molecules or atoms.
description: 5 pages, to appear in Phys. Rev. A (Rapid Communication)
0+ states in the large boson number limit of the Interacting Boson Approximation model
Creators: name: Bonatsos, Dennis
name: McCutchan, E. A.
name: Casten, R. F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Studies of the Interacting Boson Approximation (IBA) model for large boson numbers have been triggered by the discovery of shape/phase transitions between different limiting symmetries of the model. These transitions become sharper in the large boson number limit, revealing previously unnoticed regularities, which also survive to a large extent for finite boson numbers, corresponding to valence nucleon pairs in collective nuclei. It is shown that energies of 0_n^+ states grow linearly with their ordinal number n in all three limiting symmetries of IBA [U(5), SU(3), and O(6)]. Furthermore, it is proved that the narrow transition region separating the symmetry triangle of the IBA into a spherical and a deformed region is described quite well by the degeneracies E(0_2^+)=E(6_1^+), E(0_3^+)=E(10_1^+), E(0_4^+)=E(14_1^+), while the energy ratio E(6_1^+) /E(0_2^+) turns out to be a simple, empirical, easy-to-measure effective order parameter, distinguishing between first- and second-order transitions. The energies of 0_n^+ states near the point of the first order shape/phase transition between U(5) and SU(3) are shown to grow as n(n+3), in agreement with the rule dictated by the relevant critical point symmetries resulting in the framework of special solutions of the Bohr Hamiltonian. The underlying partial dynamical symmetries and quasi-dynamical symmetries are also discussed.
description: 6 pages, 4 postscript figures, LaTeX. To appear in the Proceedings of the International Conference on Nuclear Physics and Astrophysics: From Stable Beams to Exotic Nuclei (Cappadocia, 2008)
Conformal Invariance and Shape-Dependent Conductance of Graphene Samples
Creators: name: Abanin, Dmitry A.
name: Levitov, Leonid S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: For a sample of an arbitrary shape, the dependence of its conductance on the longitudinal and Hall conductivity is identical to that of a rectangle. We use analytic results for a conducting rectangle, combined with the semicircle model for transport coefficients, to study properties of the monolayer and bilayer graphene. A conductance plateau centered at the neutrality point, predicted for square geometry, is in agreement with recent experiments. For rectangular geometry, the conductance exhibits maxima at the densities of compressible quantum Hall states for wide samples, and minima for narrow samples. The positions and relative sizes of these features are different in the monolayer and bilayer cases, indicating that the conductance can be used as a tool for sample diagnostic.
description: 9 pages, 6 figures
Quantisation commutes with reduction at discrete series representations of semisimple groups
Creators: name: Hochs, Peter
Publisher: name: arXiv
Year: 2007
Subjects: subject: Symplectic Geometry (math.SG)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 53D50 (Primary), 22E46, 46L80, 53D20 (Secondary)

description: Using the analytic assembly map that appears in the Baum-Connes conjecture in noncommutative geometry, we generalise the $\Spin^c$-version of the Guillemin-Sternberg conjecture that `quantisation commutes with reduction' to (discrete series representations of) semisimple groups $G$ with maximal compact subgroups $K$ acting cocompactly on symplectic manifolds. We prove this statement in cases where the image of the momentum map in question lies in the set of strongly elliptic elements, the set of elements of $\g^*$ with compact stabilisers. This assumption on the image of the momentum map is equivalent to the assumption that $M = G \times_K N$, for a compact Hamiltonian $K$-manifold $N$. The proof comes down to a reduction to the compact case. This reduction is based on a `quantisation commutes with induction'-principle, and involves a notion of induction of Hamiltonian group actions. This principle, in turn, is based on a version of the naturality of the assembly map for the inclusion of $K$ into $G$.
description: 60 pages, substantial error corrected
Fail-Aware LIDAR-Based Odometry for Autonomous Vehicles
Creators: name: Daza, Iván García
name: Rentero, Monica
name: Maldonado, Carlota Salinas
name: Gonzalo, Rubén Izquierdo
name: Parra, Noelia Hernández
name: Ballardini, Augusto Luis
name: Llorca, David Fernández
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Autonomous driving systems are set to become a reality in transport systems and, so, maximum acceptance is being sought among users. Currently, the most advanced architectures require driver intervention when functional system failures or critical sensor operations take place, presenting problems related to driver state, distractions, fatigue, and other factors that prevent safe control. Therefore, this work presents a redundant, accurate, robust, and scalable LiDAR odometry system with fail-aware system features that can allow other systems to perform a safe stop manoeuvre without driver mediation. All odometry systems have drift error, making it difficult to use them for localisation tasks over extended periods. For this reason, the paper presents an accurate LiDAR odometry system with a fail-aware indicator. This indicator estimates a time window in which the system manages the localisation tasks appropriately. The odometry error is minimised by applying a dynamic 6-DoF model and fusing measures based on the Iterative Closest Points (ICP), environment feature extraction, and Singular Value Decomposition (SVD) methods. The obtained results are promising for two reasons: First, in the KITTI odometry data set, the ranking achieved by the proposed method is twelfth, considering only LiDAR-based methods, where its translation and rotation errors are 1.00% and 0.0041 deg/m, respectively. Second, the encouraging results of the fail-aware indicator demonstrate the safety of the proposed LiDAR odometry system. The results depict that, in order to achieve an accurate odometry system, complex models and measurement fusion techniques must be used to improve its behaviour. Furthermore, if an odometry system is to be used for redundant localisation features, it must integrate a fail-aware indicator for use in a safe manner.
Superconductivity and antiferromagnetism in the two-dimensional Hubbard model: a variational study
Creators: name: Eichenberger, D.
name: Baeriswyl, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A variational ground state of the repulsive Hubbard model on a square lattice is investigated numerically for an intermediate coupling strength (U = 8t) and for moderate sizes (from 6 x 6 to 10 x 10). Our ansatz is clearly superior to other widely used variational wave functions. The results for order parameters and correlation functions provide new insight for the antiferromagnetic state at half filling as well as strong evidence for a superconducting phase away from half filling.
description: 4 pages, 4 figures
Isospin mass splittings of heavy baryons in HQS
Creators: name: Hwang, Chien-Wen
name: Chung, Ching-Ho
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper, the electromagnetic mass differences of heavy hadrons are discussed, while ignoring the relevant hyperfine interactions. The effects of one-photon exchange interaction and up-down quark mass difference are parameterized. Two mass difference equations 2Σ_c^+ - (Σ_c^{++} + Σ_c^0) = 2Σ_b^0 - (Σ_b^+ + Σ_b^-) and (Ξ_{cc}^+ - Ξ_{cc}^{++}) + (Ξ_{bb}^- - Ξ_{bb}^{0}) =2(Ξ_{bc}^0 - Ξ_{bc}^{+}) for the heavy baryons are obtained. In addition, the masses of Σ_b^0, Ξ_b^0, and Ξ_{cc}^{++} are predicted based on the known experimental data.
description: 13 pages, 1 table. one section added. version accepted by Phys.Rev.D
Masses of excited heavy baryons in the relativistic quark-diquark picture
Creators: name: Ebert, D.
name: Faustov, R. N.
name: Galkin, V. O.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The mass spectra of the excited heavy baryons consisting of two light (u,d,s) and one heavy (c,b) quarks are calculated in the heavy-quark--light-diquark approximation within the constituent quark model. The light quarks, forming the diquark, and the light diquark in the baryon are treated completely relativistically. The expansion in v/c up to the second order is used only for the heavy (b and c) quarks. The internal structure of the diquark is taken into account by inserting the diquark-gluon interaction form factor. An overall good agreement of the obtained predictions with available experimental data is found.
description: 13 pages; changed title; added Table VIII, note on new experimental data and references; version to be published in Phys.Lett.B
The spatial clustering of mid-IR selected star forming galaxies at z ~ 1 in the GOODS fields
Creators: name: Gilli, R.
name: Daddi, E.
name: Chary, R.
name: Dickinson, M.
name: Elbaz, D.
name: Giavalisco, M.
name: Kitzbichler, M.
name: Stern, D.
name: Vanzella, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the first spatial clustering measurements of z~1, 24um-selected, star forming galaxies in the Great Observatories Origins Deep Survey (GOODS). The sample under investigation includes 495 objects in GOODS-South and 811 objects in GOODS-North selected down to flux densities of f_24>20 uJy and z_AB<23.5 mag, for which spectroscopic redshifts are available. The median redshift, IR luminosity and star formation rate (SFR) of the samples are z~0.8, L_IR~4.4 x 10^10 L_sun, and SFR~7.6 M_sun/yr, respectively. We measure the projected correlation function w(r_p) on scales of r_p=0.06-10 h^-1 Mpc, from which we derive a best fit comoving correlation length of r_0 = 4.0 +- 0.4 h^-1 Mpc and slope of gamma=1.5 +- 0.1 for the whole f_24>20uJy sample after combining the two fields. We find indications of a larger correlation length for objects of higher luminosity, with Luminous Infrared Galaxies (LIRGs, L_IR>10^11 L_sun) reaching r_0~5.1 h^-1 Mpc. This would imply that galaxies with larger SFRs are hosted in progressively more massive halos, reaching minimum halo masses of ~3 x 10^12 M_sun for LIRGs. We compare our measurements with the predictions from semi-analytic models based on the Millennium simulation. The variance in the models is used to estimate the errors in our GOODS clustering measurements, which are dominated by cosmic variance. The measurements from the two GOODS fields are found to be consistent within the errors. On scales of the GOODS fields, the real sources appear more strongly clustered than objects in the Millennium-simulation based catalogs, if the selection function is applied consistently. This suggests that star formation at z~0.5-1 is being hosted in more massive halos and denser environments than currently predicted by galaxy formation models.[truncated]
description: 19 pages, 15 figures. Accepted for publication in A&A. Style and English improved
Inhomogeneous Hubble diagram from vector K-mouflage
Creators: name: Jimenez, Jose Beltran
name: Bettoni, Dario
name: Brax, Philippe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In this Letter we construct the Hubble diagram for a Universe where dark matter is universally charged under a dark non-linear electromagnetic force which features a screening mechanism of the K-mouflage type for repulsive forces. By resorting to the Newtonian approximation, we explicitly show that the cosmological evolution generates an inhomogeneous Hubble diagram that corresponds to a curvature dominated expansion at short distances and converges to the cosmological one of $Λ$CDM. We discuss the potential impact of this inhomogeneous profile on the Hubble tension. For completeness, we explicitly show how the Newtonian approximation can be derived from an inhomogeneous relativistic Lemaître model.
description: 12 pages, 5 figures
Strategic Competence: Its Status and Implementation in EFL Teacher Training & Education in East Java, Indonesia – A Case Study
Creators: name: Prihananto, Novi
Publisher: name: Zenodo
Year: 2012

description: Since 2005, the government of the Republic of Indonesia released several laws and regulations for teachers. The main purpose of these laws and regulations is to improve the quality of teachers. Therefore, teachers are to have a standardized quality and professional competence. This proposed study seeks to investigate curriculum developers and EFL teachers in teacher education programs in East Java, Indonesia, on their understandings and perceptions towards strategic competence. Multiple strategies will be used to collect data such as questionnaires, interviews, classroom observations, and documentation (Dornyei, 2003; McKay, 2009).
Search for the Higgs boson produced with $Z \to \ell^+\ell^-$ in $p\bar{p}$ collisions at $\sqrt{s}=$ 1.96 TeV
Creators: name: CDF Collaboration
name: Aaltonen, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a search for the Higgs boson in the process $q\bar{q} \to ZH \to \ell^+\ell^- b\bar{b}$. The analysis uses an integrated luminosity of 1 fb$^{-1}$ of $p\bar{p}$ collisions produced at $\sqrt{s} =$ 1.96 TeV and accumulated by the upgraded Collider Detector at Fermilab (CDF II). We employ artificial neural networks both to correct jets mismeasured in the calorimeter, and to distinguish the signal kinematic distributions from those of the background. We see no evidence for Higgs boson production, and set 95% CL upper limits on $σ_{ZH} \cdot {\cal B}(H \to b\bar{b}$), ranging from 1.5 pb to 1.2 pb for a Higgs boson mass ($m_H$) of 110 to 150 GeV/$c^2$.
LabelBee: a web platform for large-scale semi-automated analysis of honeybee behavior from video
Creators: name: Mégret, Rémi
name: Rodriguez, Ivan F.
name: Ísada Claudio Ford
name: Acuña, Edgar
name: Agosto-Rivera, Jose L.
name: Tugrul Giray
Publisher: name: F1000 Research Limited
Year: 2019

description: The LabelBee system is designed to facilitate the collection, annotation and analysis of large amounts of honeybee behavior data from video monitoring. It is developed as part of NSF BIGDATA project “Large-scale multi-parameter analysis of honeybee behavior in their natural habitat”, where we analyze continuous video of the entrance of bee colonies. One key aspect is the presence of bees with barcode tags, which can be identified to individually to monitor the variability of their individual behavior on the long-term (from days to seasons). Due to the large volume of data and its complexity, LabelBee provides advanced AI and visualization capabilities to enable the construction of good quality datasets necessary for the discovery of complex behavior patterns. It integrates several levels of information: raw video, honeybee positions, decoded tags, individual trajectories and behavior events (entrance/exit, presence of pollen, fanning, etc.). This integration enable to combination of manual and automatic processing, where automatic results can be corrected and extended by multiple users connecting to the platform.

This flexibility facilitates the close collaboration between Biologists and Computer Scientists. Biologists, as users of the platform, can annotate the behaviors of interest by looking directly at the videos, which is an improvement over the traditional approach of direct observation in the field. Typical dataset creation involves three steps: first step is the main annotation, which involves several users working on intervals of one hour of video, the second step is the cleaning by a different user, the last step is curation by an expert user who ensures uniform standards. Visualization aids such as highlighting potentially redundant annotation helps with this process. Computer Scientists, as contributors to the platform capabilities, have developed several additional AI modules to automatize part of the analysis. First, automatic tag detection helped focus the attention of the users on the precise times where tagged bees are passing through the entrance. Then, modules for the automatic detection of untagged bees and pollen were trained based on already annotated data. We are currently in the process of integrating these newly trained modules in the platform, to accelerate the main annotation step. The data constructed by this semi-automatized approach can then be exported for the analytic part taking place on the same server: long-term behavior datasets can be visualized and manipulated through Jupyter notebooks for the extraction and exploration of behavior patterns.
The formation of spiral arms and rings in barred galaxies
Creators: name: Romero-Gomez, M.
name: Athanassoula, E.
name: Masdemont, J. J.
name: Garcia-Gomez, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this and in a previous paper (Romero-Gomez et al. 2006) we propose a theory to explain the formation of both spirals and rings in barred galaxies using a common dynamical framework. It is based on the orbital motion driven by the unstable equilibrium points of the rotating bar potential. Thus, spirals, rings and pseudo-rings are related to the invariant manifolds associated to the periodic orbits around these equilibrium points. We examine the parameter space of three barred galaxy models and discuss the formation of the different morphological structures according to the properties of the bar model. We also study the influence of the shape of the rotation curve in the outer parts, by making families of models with rising, flat, or falling rotation curves in the outer parts. The differences between spiral and ringed structures arise from differences in the dynamical parameters of the host galaxies. The results presented here will be discussed and compared with observations in a forthcoming paper.
description: 16 pages, 13 figures, accepted in A&A. High resolution version available at http://www.oamp.fr/dynamique/pap/merce.html
Theory of the magnetic resonance spectrum of spin-polarized hydrogen gas
Creators: name: Zhou, Haosheng
Publisher: name: University of British Columbia
Year: 2010

description: The Green's function method is applied to investigate the magnetic spin resonance spectra of three-dimensional and two-dimensional spin-polarized quantum gases. The Hartree-Fock approximation is employed to calculate the one-particle Green's function of the atoms, then this one-particle Green's function is used for the calculation of the vertex part of the Green's function. Such a combination yields a self-consistent result. The absorption spectra are obtained from the calculation of the susceptibility in terms of the two-particle Green's function (bubble diagram). Some general expressions for the dispersion relation, for the effective mass of a spin wave, and for the dipolar frequency shift are given in the calculation. In order to estimate the shift of the electron-spin-resonance (ESR) frequency, the effective dipole-dipole interactions among the hydrogen atoms are included in the calculation. These effective interactions are deduced from the ladder approximation, and hence are characterized by the scattering amplitude. The scattering amplitude is calculated numerically. The result shows that the theoretical value of the shift is smaller than the experimentally observed value by about 35%.
Brevitobrilus larae Tsalolikhin 2020, sp. nov.
Creators: name: Tsalolikhin, S. Ya.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Enoplea
Triplonchida
Tobrilidae
Brevitobrilus
Brevitobrilus larae

description: Brevitobrilus larae sp. nov.
(Figs 5– 9)
Holotype. Female, Vietnam, Kon Tum Prov., Kon Plong Distr., Kon Chu Rang Nature Reserve, pond in forest, 1077 m a.s.l., 14°35′22″N, 108°25′04″E, 10 Oct. 2018, coll. L. Iogansen. Microscope slide No. A-9195, ZISP.
Paratypes. 6 females, same data as for holotype.
Description. Females. Morphometric descriptions of the holotype and paratypes are given in Table 2. Cuticle thin, in total about 2 µm thick in middle of body. Outline of head round and not offset. Head with six distinct lips, each with one small papilla. Longer cephalic setae 6–8 µm, shorter setae about 4 µm. Width of head 19 µm. Buccal cavity 8–10 (9) µm wide and 10 µm long; total depth of stoma (buccal cavity and pockets) 20–26 (23) µm; two pockets separated by short isthmus, each pocket with one teeth, distance between tops of teeth 9 µm. Amphid openings at level of bottom of buccal cavity or at level of first pocket; amphid diameter 4 µm, approximately one-sixth part of corresponding body width. Reproductive system didelphic, amphidelphic; ovaries reflexed, oocytes arranged in double rows in germinal zone; only two females with mature eggs in uterus. Depth of vagina corresponding to one-third – half of body width. Tail elongate-conoid, spinneret 1–2 µm long; subterminal setae absent.
Male not found.
Comparision. The new species Brevitobrilus larae sp. nov. most closely resembles B. orientalis Tsalolikhin, 2013, which was described from Kazakhstan (Tsalolikhin, 2013). The new species differs from B. orientalis by longer body (851−1048 µm vs 788−871 µm), longer (6−8 µm vs 5−6 µm) and thinner, not hornlike cephalic setae, in longer tail (111−147 µm vs 77−82 µm) and absence of subterminal setae.
Note: All absolute measurements are in µm and the form: range and mean ± error of mean.
Note: All absolute measurements are in µm and in the form: range and mean ± error of mean.
Etimology. The species is named after the herpetologist Larissa (Lara) Iogansen, who collected material for me in the jungles of Vietnam.
description: Published as part of Tsalolikhin, S. Ya., 2020, Two new species of free-living nematodes (Nematoda) from Vietnam, pp. 11-16 in Zoosystematica Rossica (Zoosyst. Rossica) (Zoosyst. Rossica) 29 (1) on pages 12-15, DOI: 10.31610/zsr/2020.29.1.11, http://zenodo.org/record/10124222
Investigating the Relationship Between the Hot Gas and the Dark Matter Components of Galaxy Clusters
Creators: name: Powell, Leila C.
name: Kay, Scott T.
name: Babul, Arif
name: Mahdavi, Andisheh
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Various differences in galaxy cluster properties derived from X-ray and weak lensing observations have been highlighted in the literature. One such difference is the observation of mass concentrations in lensing maps which have no X-ray counterparts (e.g. Jee, White, Ford et al. 2005). We investigate this issue by identifying substructures in maps of projected total mass (analogous to weak lensing mass reconstructions) and maps of projected X-ray surface brightness for three simulated clusters. We then compare the 2D mass substructures with both 3D subhalo data and the 2D X-ray substructures. Here we present preliminary results from the first comparison, where we have assessed the impact of projecting the data on subhalo identification.
description: 2 pages, 2 figures, to be published in proceedings of IAUS 244 "Dark Galaxies and Lost Baryons"