cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Generators for the hyperelliptic Torelli group and the kernel of the Burau representation at t=-1
Creators: name: Brendle, Tara
name: Margalit, Dan
name: Putman, Andrew
Publisher: name: arXiv
Year: 2012
Subjects: subject: Geometric Topology (math.GT)
subject: Algebraic Geometry (math.AG)
subject: Group Theory (math.GR)
subject: FOS: Mathematics

description: We prove that the hyperelliptic Torelli group is generated by Dehn twists about separating curves that are preserved by the hyperelliptic involution. This verifies a conjecture of Hain. The hyperelliptic Torelli group can be identified with the kernel of the Burau representation evaluated at t=-1 and also the fundamental group of the branch locus of the period mapping, and so we obtain analogous generating sets for those. One application is that each component in Torelli space of the locus of hyperelliptic curves becomes simply connected when curves of compact type are added.
description: 37 pages, 9 figures; Major revision, to appear in Inventiones Mathematicae
Continuous Three-level Quantum Heat Engine with High Performance Under Medium Temperature Difference
Creators: name: Deng, Gao-xiang
name: Shao, Wei
name: Liu, Yu
name: Cui, Zheng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The possibility of utilizing quantum effects to enhance the performance of quantum heat engines has been an active topic of research, but how to enhance the performance by optimizing the engine parameters needs to be further studied. In this study, the temperature difference and dissipation modes affecting the performance of a three-level quantum heat engine were analyzed using an orthogonal test. The results indicated that the dissipation mode dominated the performance of the quantum heat engine. The quantum heat engine performs best when there is only resonance and no detuning; however, when detuning exists, a lower resonance can improve the efficiency by reducing energy losses. Regarding the temperature difference, the best performance was achieved at medium temperature difference owing to the decreasing heat leakage. Finally, the quantum friction caused by the detuning could make the maximal efficiency lower than the Carnot efficiency.
Reshaping and Capturing Leidenfrost drops with a magnet
Creators: name: Piroird, Keyvan
name: Texier, Baptiste Darbois
name: Clanet, Christophe
name: Quéré, David
Publisher: name: arXiv
Year: 2012
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Liquid oxygen, which is paramagnetic, also undergoes Leidenfrost effect at room temperature. In this article, we first study the deformation of oxygen drops in a magnetic field and show that it can be described via an effective capillary length, which includes the magnetic force. In a second part, we describe how these ultra-mobile drops passing above a magnet significantly slow down and can even be trapped. The critical velocity below which a drop is captured is determined from the deformation induced by the field.
description: Published in Physics of Fluids (vol. 25, 032108, 2013) http://pof.aip.org/resource/1/phfle6/v25/i3/p032108_s1?isAuthorized=no
Impact of climate change and extreme weather on flood events
Creators: name: Amir, Md Sharif
Publisher: name: CQUniversity
Year: 2023
Subjects: classificationCode: 400513
subject: Water resources engineering

description: Floods are one of the most damaging types of weather-related disasters which pose serious hazards to human property and life in many parts of the world. Extreme weather events like floods will become more frequent and severe due to climate change. In addition, major flooding can result from heavy rainfall during an extreme event in one or more sub-catchments in a large basin. Global climate change can further increase the intensity of extreme events and cause rises in sea level. Change of temperature, potential evaporation and rainfall are also the results of global climate change.
It's a jungle in here: Conceptualising the crowdedness experience of Mumbai's railway commuters
Creators: name: Hirsch, Lily
Publisher: name: CQUniversity
Year: 2023
Subjects: classificationCode: 520402
subject: Decision making

description: Crowded rail travel is a daily experience for millions of commuters worldwide. The implications of passenger crowding are well understood from economic, health, and policy perspectives. Whilst factors extrinsic to the crowded body are well recognised, the experience of the crowded body itself has been largely ignored. This renders passengers as passive components of the crowd. The aim of this research is to develop an experiential understanding of crowding that accommodates the perspectives and experiences of passengers as proactive parts of the crowd.
Superhuman Artificial Intelligence Can Improve Human Decision Making by Increasing Novelty
Creators: name: Shin, Minkyu
name: Kim, Jin
name: van Opheusden, Bas
name: Griffiths, Thomas L.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Artificial Intelligence (cs.AI)
subject: General Economics (econ.GN)
subject: FOS: Computer and information sciences
subject: FOS: Economics and business
subject: I.2.0; I.2.1; I.2.6; I.2.m
subject: 68T01, 68T05, 68T35, 68T99

description: How will superhuman artificial intelligence (AI) affect human decision making? And what will be the mechanisms behind this effect? We address these questions in a domain where AI already exceeds human performance, analyzing more than 5.8 million move decisions made by professional Go players over the past 71 years (1950-2021). To address the first question, we use a superhuman AI program to estimate the quality of human decisions across time, generating 58 billion counterfactual game patterns and comparing the win rates of actual human decisions with those of counterfactual AI decisions. We find that humans began to make significantly better decisions following the advent of superhuman AI. We then examine human players' strategies across time and find that novel decisions (i.e., previously unobserved moves) occurred more frequently and became associated with higher decision quality after the advent of superhuman AI. Our findings suggest that the development of superhuman AI programs may have prompted human players to break away from traditional strategies and induced them to explore novel moves, which in turn may have improved their decision-making.
description: This paper is published in PNAS: https://www.pnas.org/doi/10.1073/pnas.2214840120 Minor edits to v1 include the addition of watermark and link to the published paper in the footer
Joint numerical ranges, quantum maps, and joint numerical shadows
Creators: name: Gutkin, Eugene
name: Zyczkowski, Karol
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: Operator Algebras (math.OA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We associate with k hermitian N\times N matrices a probability measure on R^k. It is supported on the joint numerical range of the k-tuple of matrices. We call this measure the joint numerical shadow of these matrices. Let k=2. A pair of hermitian N\times N matrices defines a complex N\times N matrix. The joint numerical range and the joint numerical shadow of the pair of hermitian matrices coincide with the numerical range and the numerical shadow, respectively, of this complex matrix. We study relationships between the dynamics of quantum maps on the set of quantum states, on one hand, and the numerical ranges, on the other hand. In particular, we show that under the identity resolution assumption on Kraus operators defining the quantum map, the dynamics shrinks numerical ranges.
description: 12 latex pages, 3 figures in eps, revised version, several improvements
Ein Fundkomplex der Römischen Kaiserzeit vom Northeimer Kiessee, Ldkr. Northeim
Creators: name: Teuber, Stefan W.
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 73 (2004): Nachrichten aus Niedersachsens Urgeschichte
Dénes Gabler und Andrea H. Vaday, Terra Sigillata im Barbaricum zwischen Pannonien und Dazien
Creators: name: Wielowiejski, Jerzy
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Dénes Gabler und Andrea H. Vaday, Terra Sigillata im Barbaricum zwischen Pannonien und Dazien. Fontes Archaeologici Hungariae. Akademiai Kiadö, Budapest 1986. 85 Seiten, 37 Abbildungen
description: Bonner Jahrbücher, Bd. 188.1988: Bonner Jahrbücher
Andrea Kaltofen, Studien zur Chronologie der Völkerwanderungszeit im südöstlichen Mitteleuropa
Creators: name: Bierbrauer, Volker
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Andrea Kaltofen, Studien zur Chronologie der Völkerwanderungszeit im südöstlichen Mitteleuropa. British Archaeological Reports, International Series 191. Oxford 1984. 407 Seiten, 5 Beilagen
description: Bonner Jahrbücher, Bd. 188.1988: Bonner Jahrbücher
Enhanced anti-Unruh effect by simulated light-matter interactions
Creators: name: Pan, Yongjie
name: Zhang, Baocheng
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the transition of a two-level atom as the Unruh-Dewitt detector accelerated in the electromagnetic field in this paper. The enhancement of the transition probability is found for different field states under the conditions that the anti-Unruh effect appears. In particular, the enhancement is the most prominent when the field state takes the squeezed state. We also construct a new atomic trajectory to realize the effect of acceleration-induced transparency. Based on this, we show that the anti-Unruh effect still exists even at the specific atomic energy difference where acceleration-induced transparency happens.
description: It has been accepted for publication by Physical Review D
Charlotte Schubert, Land und Raum in der römischen Republik. Die Kunst des Teilens
Creators: name: Chevallier, Raymond
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Charlotte Schubert, Land und Raum in der römischen Republik. Die Kunst des Teilens. Wissenschaftliche Buchgesellschaft, Darmstadt 1996. VIII, 174 Seiten, 34 Abbildungen
description: Bonner Jahrbücher, Bd. 198.1998(2001): Bonner Jahrbücher
Diffusive Excitonic Bands from Frustrated Triangular Sublattice in a Singlet-Ground-State System
Creators: name: Gao, Bin
name: Chen, Tong
name: Wu, Xiao-Chuan
name: Flynn, Michael
name: Duan, Chunruo
name: Chen, Lebing
name: Huang, Chien-Lung
name: Liebman, Jesse
name: Li, Shuyi
name: Ye, Feng
name: Stone, Matthew B.
name: Podlesnyak, Andrey
name: Abernathy, Douglas L.
name: Adroja, Devashibhai T.
name: Le, Manh Duc
name: Huang, Qingzhen
name: Nevidomskyy, Andriy H.
name: Morosan, Emilia
name: Balents, Leon
name: Dai, Pengcheng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Magnetic order in most materials occurs when magnetic ions with finite moments in a crystalline lattice arrange in a particular pattern below the ordering temperature determined by exchange interactions between the ions. However, when the crystal electric field (CEF) effect results in a spin-singlet ground state on individual magnetic sites, the collective ground state of the system can either remain non-magnetic, or more intriguingly, the exchange interactions between neighboring ions, provided they are sufficiently strong, can admix the excited CEF levels, resulting in a magnetically ordered ground state. The collective magnetic excitations in such a state are so-called spin excitons that describe the CEF transitions propagating through the lattice. In most cases, spin excitons originating from CEF levels of a localized single ion are dispersion-less in momentum (reciprocal) space and well-defined in both the magnetically ordered and paramagnetic states. Here we use thermodynamic and neutron scattering experiments to study stoichiometric Ni2Mo3O8 without site disorder, where Ni2+ ions form a bipartite honeycomb lattice comprised of two triangular lattices, with ions subject to the tetrahedral and octahedral crystalline environment, respectively. We find that in both types of ions, the CEF excitations have nonmagnetic singlet ground states, yet the material has long-range magnetic order. Furthermore, CEF spin excitons from the triangular-lattice arrangement of tetrahedral sites form, in both the antiferromagnetic and paramagnetic states, a dispersive diffusive pattern around the Brillouin zone boundary in reciprocal space. The present work thus demonstrates that spin excitons in an ideal triangular lattice magnet can have dispersive excitations, irrespective of the existence of static magnetic order, and this phenomenon is most likely due to spin entanglement and geometric frustrations.
On an unverified nuclear decay and its role in the DAMA experiment
Creators: name: Pradler, Josef
name: Singh, Balraj
name: Yavin, Itay
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The rate of the direct decay of 40K to the ground state of 40Ar through electron capture has not been experimentally reported. Aside from its inherent importance for the theory of electron capture as the only such decay known of its type (unique third-forbidden), this decay presents an irreducible background in the DAMA experiment. We find that the presence of this background, as well as others, poses a challenge to any interpretation of the DAMA results in terms of a Dark Matter model with a small modulation fraction. A 10ppb contamination of natural potassium requires a 20% modulation fraction or more. A 20ppb contamination, which is reported as an upper limit by DAMA, disfavors any Dark Matter origin of the signal. This conclusion is based on the efficiency of detecting 40K decays as inferred from simulation. We propose measures to help clarify the situation.
description: 8 pages, 3 figures; v2 - published version; results unchanged; an addendum can be found in http://arxiv.org/abs/arXiv:1210.7548
Dynamics of driven granular suspensions
Creators: name: Fiege, Andrea
name: Zippelius, Annette
Publisher: name: Göttingen : GOEDOC, Dokumenten- und Publikationsserver der Georg-August-Universität Göttingen
Year: 2014
Subjects: subject: Fluidized beds; suspensions; sedimentation

description: We suggest a simple model for the dynamics of granular particles in suspension which is suitable for an event driven algorithm, allowing to simulate N O (106) particles or more. As  first application we consider a dense granular packing which is fluidized by an upward  tream of liquid, i.e. a fluidized bed. In the stationary state, when all forces balance, we always observe a well defined interface whose width is approximately independent of packing fraction.
High-resolution elemental abundance analysis of the open cluster IC 4756
Creators: name: Ting, Yuan-Sen
name: De Silva, Gayandhi M.
name: Freeman, Kenneth C.
name: Parker, Stacey-Jo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present detailed elemental abundances of 12 subgiants in the open cluster IC 4756 including Na, Al, Mg, Si, Ca, Ti, Cr, Ni, Fe, Zn and Ba. We measure the cluster to have [Fe/H] = -0.01 +/- 0.10. Most of the measured star-to-star [X/H] abundance variation is below sigma < 0.03, as expected from a coeval stellar population preserving natal abundance patterns, supporting the use of elemental abundances as a probe to reconstruct dispersed clusters. We find discrepancies between Cr I and Cr II abundances as well as between Ti I and Ti II abundances, where the ionized abundances are larger by about 0.2 dex. This follows other such studies which demonstrate the effects of overionization in cool stars. IC 4756 are supersolar in Mg, Si, Na and Al, but are solar in the other elements. The fact that IC 4756 is supersolar in some alpha-elements (Mg, Si) but solar in the others (Ca, Ti) suggests that the production of alpha-elements is not simply one dimensional and could be exploited for chemical tagging.
description: 13 pages, 13 figures, 10 tables, MNRAS (Accepted for publication- 2012 August 25)
Contagion dynamics in time-varying metapopulation networks
Creators: name: Liu, Suyu
name: Baronchelli, Andrea
name: Perra, Nicola
Publisher: name: arXiv
Year: 2012
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Social and Information Networks (cs.SI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The metapopulation framework is adopted in a wide array of disciplines to describe systems of well separated yet connected subpopulations. The subgroups or patches are often represented as nodes in a network whose links represent the migration routes among them. The connections have been so far mostly considered as static, but in general evolve in time. Here we address this case by investigating simple contagion processes on time-varying metapopulation networks. We focus on the SIR process and determine analytically the mobility threshold for the onset of an epidemic spreading in the framework of activity-driven network models. We find profound differences from the case of static networks. The threshold is entirely described by the dynamical parameters defining the average number of instantaneously migrating individuals and does not depend on the properties of the static network representation. Remarkably, the diffusion and contagion processes are slower in time-varying graphs than in their aggregated static counterparts, the mobility threshold being even two orders of magnitude larger in the first case. The presented results confirm the importance of considering the time-varying nature of complex networks.
description: 11 pages, 5 figures
Queuing with future information
Creators: name: Spencer, Joel
name: Sudan, Madhu
name: Xu, Kuang
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: Networking and Internet Architecture (cs.NI)
subject: Performance (cs.PF)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We study an admissions control problem, where a queue with service rate $1-p$ receives incoming jobs at rate $λ\in(1-p,1)$, and the decision maker is allowed to redirect away jobs up to a rate of $p$, with the objective of minimizing the time-average queue length. We show that the amount of information about the future has a significant impact on system performance, in the heavy-traffic regime. When the future is unknown, the optimal average queue length diverges at rate $\sim\log_{1/(1-p)}\frac{1}{1-λ}$, as $λ\to 1$. In sharp contrast, when all future arrival and service times are revealed beforehand, the optimal average queue length converges to a finite constant, $(1-p)/p$, as $λ\to1$. We further show that the finite limit of $(1-p)/p$ can be achieved using only a finite lookahead window starting from the current time frame, whose length scales as $\mathcal{O}(\log\frac{1}{1-λ})$, as $λ\to1$. This leads to the conjecture of an interesting duality between queuing delay and the amount of information about the future.
description: Published in at http://dx.doi.org/10.1214/13-AAP973 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Colliot-Thélène's conjecture and finiteness of u-invariants
Creators: name: Lieblich, Max
name: Parimala, R.
name: Suresh, V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics

description: We show that Colliot-Thélène's conjecture on 0-cycles of degree 1 implies finiteness for the u-invariant of the function field of a curve over a totally imaginary number field and period-index bounds for the Brauer groups of arbitrary fields of transcendence degree 1 over the rational numbers.
description: 25 pages, comments welcome at any time
Dynamic Partial Order Reduction for Checking Correctness against Transaction Isolation Levels
Creators: name: Bouajjani, Ahmed
name: Enea, Constantin
name: Román-Calvo, Enrique
Publisher: name: arXiv
Year: 2023
Subjects: subject: Programming Languages (cs.PL)
subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: Modern applications, such as social networking systems and e-commerce platforms are centered around using large-scale databases for storing and retrieving data. Accesses to the database are typically enclosed in transactions that allow computations on shared data to be isolated from other concurrent computations and resilient to failures. Modern databases trade isolation for performance. The weaker the isolation level is, the more behaviors a database is allowed to exhibit and it is up to the developer to ensure that their application can tolerate those behaviors. In this work, we propose stateless model checking algorithms for studying correctness of such applications that rely on dynamic partial order reduction. These algorithms work for a number of widely-used weak isolation levels, including Read Committed, Causal Consistency, Snapshot Isolation, and Serializability. We show that they are complete, sound and optimal, and run with polynomial memory consumption in all cases. We report on an implementation of these algorithms in the context of Java Pathfinder applied to a number of challenging applications drawn from the literature of distributed systems and databases.
description: Submission to PLDI 2023
Diffusion transport coefficients for granular binary mixtures at low density. Thermal diffusion segregation
Creators: name: Garzó, Vicente
name: Murray, J. Aaron
name: Reyes, Francisco Vega
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The mass flux of a low-density granular binary mixture obtained previously by solving the Boltzmann equation by means of the Chapman-Enskog method is considered further. As in the elastic case, the associated transport coefficients $D$, $D_p$ and $D'$ are given in terms of the solutions of a set of coupled linear integral equations which are approximately solved by considering the first and second Sonine approximations. The diffusion coefficients are explicitly obtained as functions of the coefficients of restitution and the parameters of the mixture (masses, diameters and concentration) and their expressions hold for an arbitrary number of dimensions. In order to check the accuracy of the second Sonine correction for highly inelastic collisions, the Boltzmann equation is also numerically solved by means of the direct simulation Monte Carlo (DSMC) method to determine the mutual diffusion coefficient $D$ in some special situations (self-diffusion problem and tracer limit). The comparison with DSMC results reveals that the second Sonine approximation to $D$ improves the predictions made from the first Sonine approximation. We also study the granular segregation driven by a uni-directional thermal gradient. The segregation criterion is obtained from the so-called thermal diffusion factor $Λ$, which measures the amount of segregation parallel to the temperature gradient. The factor $Λ$ is determined here by considering the second-order Sonine forms of the diffusion coefficients and its dependence on the coefficients of restitution is widely analyzed across the parameter space of the system. The results obtained in this paper extend previous works carried out in the tracer limit (vanishing mole fraction of one of the species) by some of the authors of the present paper.
description: 15 figures; to be published in Phys. Fluids
Algebraic Geometry of the Center-Focus problem for Abel Differential Equation
Creators: name: Briskin, M.
name: Pakovich, F.
name: Yomdin, Y.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Complex Variables (math.CV)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 34C07, 34C08

description: The Abel differential equation $y'=p(x)y^3 + q(x) y^2$ with polynomial coefficients $p,q$ is said to have a center on $[a,b]$ if all its solutions, with the initial value $y(a)$ small enough, satisfy the condition $y(a)=y(b)$. The problem of giving conditions on $(p,q,a,b)$ implying a center for the Abel equation is analogous to the classical Poincaré Center-Focus problem for plane vector fields. Center conditions are provided by an infinite system of "Center Equations". An important new information on these equations has been obtained via a detailed analysis of two related structures: Composition Algebra and Moment Equations (first order approximation of the Center ones). Recently one of the basic open questions in this direction - the "Polynomial moments problem" - has been completely settled in \cite{mp1,pak}. In this paper we present a progress in the following two main directions: First, we translate the results of \cite{mp1,pak} into the language of Algebraic Geometry of the Center Equations. On this base we obtain new information on the center conditions, significantly extending, in particular, the results of \cite{broy}. Second, we study the "second Melnikov coefficients" (second order approximation of the Center equations) showing that in many cases vanishing of the moments and of these coefficients is sufficient in order to completely characterize centers.
Weakness or Strength in the Golden Years of RHIC and LHC?
Creators: name: Horowitz, W. A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Recent LHC data suggest that perturbative QCD provides a qualitatively consistent picture of jet quenching. Constrained to RHIC pi0 suppression, zero parameter WHDG energy loss predictions agree quantitatively with the charged hadron v2 and D meson RAA measured at LHC and qualitatively with the charged hadron RAA. On the other hand, RHIC-constrained LHC predictions from fully strongly-coupled AdS/CFT qualitatively oversuppress D mesons compared to data; light meson predictions are on less firm theoretical ground but also suggest oversuppression. More detailed data from heavy, especially B, mesons will continue to help clarify our picture of the physics of the quark-gluon plasma. Since the approach of pQCD predictions to LHC data occurs at momenta >~ 15 GeV/c, a robust consistency check between pQCD and both RHIC and LHC data requires RHIC jet measurements.
description: 4 pages. 3 figures. Proceedings for Hard Probes 2012. Minor grammatical and reference changes from v1
Planet Hunters: A Transiting Circumbinary Planet in a Quadruple Star System
Creators: name: Schwamb, Megan E.
name: Orosz, Jerome A.
name: Carter, Joshua A.
name: Welsh, William F.
name: Fischer, Debra A.
name: Torres, Guillermo
name: Howard, Andrew W.
name: Crepp, Justin R.
name: Keel, William C.
name: Lintott, Chris J.
name: Kaib, Nathan A.
name: Terrell, Dirk
name: Gagliano, Robert
name: Jek, Kian J.
name: Parrish, Michael
name: Smith, Arfon M.
name: Lynn, Stuart
name: Simpson, Robert J.
name: Giguere, Matthew J.
name: Schawinski, Kevin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We report the discovery and confirmation of a transiting circumbinary planet (PH1b) around KIC 4862625, an eclipsing binary in the Kepler field. The planet was discovered by volunteers searching the first six Quarters of publicly available Kepler data as part of the Planet Hunters citizen science project. Transits of the planet across the larger and brighter of the eclipsing stars are detectable by visual inspection every ~137 days, with seven transits identified in Quarters 1-11. The physical and orbital parameters of both the host stars and planet were obtained via a photometric-dynamical model, simultaneously fitting both the measured radial velocities and the Kepler light curve of KIC 4862625. The 6.18 +/- 0.17 Earth radii planet orbits outside the 20-day orbit of an eclipsing binary consisting of an F dwarf (1.734 +/- 0.044 Solar radii, 1.528 +/- 0.087 Solar masses) and M dwarf (0.378+/- 0.023 Solar radii, 0.408 +/- 0.024 Solar masses). For the planet, we find an upper mass limit of 169 Earth masses (0.531 Jupiter masses) at the 99.7% confidence level. With a radius and mass less than that of Jupiter, PH1b is well within the planetary regime. Outside the planet's orbit, at ~1000 AU,a previously unknown visual binary has been identified that is likely bound to the planetary system, making this the first known case of a quadruple star system with a transiting planet.
description: accepted to ApJ (Table 1 will be included in full as a machine readable table in the ApJ online version). 54 pages, 15 figures, 9 tables
Experiences of Chinese academics: Working at an Australian regional university: An embedded case study
Creators: name: Jiang, Lucy
Publisher: name: CQUniversity
Year: 2023
Subjects: classificationCode: 390303
subject: Higher education

description: Globalisation and international migration can be found among many professions and occupations. Australian universities are employing academics with international experiences, plus international academics with experience of other educational systems. While there is increasing body of research about the experiences of international students in Australian universities, there is limited research concerning experiences of international academics, especially those of Chinese origin. This study explores and documents the experiences of nine Chinese academics working at a regional Australian university. An embedded case study approach enabled an analysis of interview data where the experiences of theses academics were examined in relation to the changing social and political contexts within the People’s Republic of China since 1949 and the HE context in Australia. This study found that these academics began their educational journeys in China with eventual migration to Australia. All nine academics possessed higher education qualifications and a proven research capacity that enabled them gain academic positions at the regional university. Their experiences of the Australian higher education system varied and this demonstrated a range of personal and professional adjustments in order to gain a permanent position in a regional university. Therefore this study contributes to an area where there is little systematic research on Chinese academic migration generally, but more specifically the potential impact of the Chinese academics in Australian institutions.
Simulation of structural and electronic properties of amorphous tungsten oxycarbides
Creators: name: Muthukumar, Kaliappan
name: Valenti, Roser
name: Jeschke, Harald O.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Electron beam induced deposition with tungsten hexacarbonyl W(CO)6 as precursors leads to granular deposits with varying compositions of tungsten, carbon and oxygen. Depending on the deposition conditions, the deposits are insulating or metallic. We employ an evolutionary algorithm to predict the crystal structures starting from a series of chemical compositions that were determined experimentally. We show that this method leads to better structures than structural relaxation based on guessed initial structures. We approximate the expected amorphous structures by reasonably large unit cells that can accommodate local structural environments that resemble the true amorphous structure. Our predicted structures show an insulator to metal transition close to the experimental composition at which this transition is actually observed. Our predicted structures also allow comparison to experimental electron diffraction patterns.
description: 17 Pages, 11 figures
Nonlinear microrheology of dense colloidal suspensions: a mode-coupling theory
Creators: name: Gazuz, Igor
name: Fuchs, Matthias
Publisher: name: arXiv
Year: 2012
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A mode-coupling theory for the motion of a strongly forced probe particle in a dense colloidal suspension is presented. Starting point is the Smoluchowski equation for $N$ bath and a single probe particle. The probe performs Brownian motion under the influence of a strong constant and uniform external force $\Fex$. It is immersed in a dense homogeneous bath of (different) particles also performing Brownian motion. Fluid and glass states are considered; solvent flow effects are neglected. Based on a formally exact generalized Green-Kubo relation, mode coupling approximations are performed and an integration through transients approach applied. A first-principles theory for the nonlinear velocity-force relations of the probe particle in a dense fluid and for the (de-) localized probe in a glass is obtained. It extends the mode coupling theory of the glass transition to strongly forced tracer motion and describes active microrheology experiments. A force threshold is identified which needs to be overcome to pull the probe particle free in a glass. For the model of hard sphere particles, the microscopic equations for the threshold force and the probability density of the localized probe are solved numerically. Neglecting the spatial structure of the theory, a schematic model is derived which contains two types of bifurcation, the glass transition and the force-induced delocalization, and which allows for analytical and numerical solutions. We discuss its phase diagram, forcing effects on the time-dependent correlation functions, and the friction increment. The model was successfully applied to simulations and experiments on colloidal hard sphere systems [I. Gazuz et. al., Phys. Rev. Lett. 102, 248302 (2009)], while we provide detailed information on its derivation and general properties.
description: 24 pages, 14 figures
Theory of Charge Order and Heavy-Electron Formation in the Mixed-Valence Compound KNi$_2$Se$_2$
Creators: name: Murray, James M.
name: Tesanovic, Zlatko
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The material KNi$_2$Se$_2$ has recently been shown to possess a number of striking physical properties, many of which are apparently related to the mixed valency of this system, in which there is on average one quasi-localized electron per every two Ni sites. Remarkably, the material exhibits a charge density wave (CDW) phase that disappears upon cooling, giving way to a low-temperature coherent phase characterized by an enhanced electron mass, reduced resistivity, and an enlarged unit cell free of structural distortion. Starting from an extended periodic Anderson model and using the slave-boson formulation, we develop a model for this system and study its properties within mean-field theory. We find a reentrant first-order transition from a CDW phase, in which the localized moments form singlet dimers, to a heavy Fermi liquid phase as temperature is lowered. The magnetic susceptibility is Pauli-like in both the high- and low-temperature regions, illustrating the lack of a single-ion Kondo regime such as that usually found in heavy-fermion materials.
description: 4.5 pages, 4 figures. Published version
Homotopy types of moment-angle complexes for flag complexes
Creators: name: Grbic, Jelena
name: Panov, Taras
name: Theriault, Stephen
name: Wu, Jie
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Topology (math.AT)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics

description: We study the homotopy types of moment-angle complexes, or equivalently, of complements of coordinate subspace arrangements. The overall aim is to identify the simplicial complexes K for which the corresponding moment-angle complex Z_K has the homotopy type of a wedge of spheres or a connected sum of sphere products. When K is flag, we identify in algebraic and combinatorial terms those K for which Z_K is homotopy equivalent to a wedge of spheres, and give a combinatorial formula for the number of spheres in the wedge. This extends results of Berglund and Joellenbeck on Golod rings and homotopy theoretical results of the first and third authors. We also establish a connection between minimally non-Golod rings and moment-angle complexes Z_K which are homotopy equivalent to a connected sum of sphere products. We go on to show that for any flag complex K the loop spaces of Z_K and DJ(K) are homotopy equivalent to a product of spheres and loops on spheres when localised rationally or at any odd prime.
description: 20 pages. Misprints corrected, sections 6 and 8 removed (they are available in version 4)
An exploratory determination of the effect of a male pheromone on the product choice of females
Creators: name: Waller, IA
Publisher: name: CQUniversity
Year: 2017
Subjects: classificationCode: 350605
subject: Marketing management (incl. strategy and customer relations)

description: "The underlying intention of this research was to investigate how consumers and customers behave and whether it impacts on the current domain of marketing inquiry. This was done by examining the historical development of the marketing discipline, and highlighting an opportunity to incorporate the research findings from other disciplines into marketing's inquiry towards understanding consumer behaviour. The vehicle for this approach was the concept of the servicescape where sensory systems are attributed towards consumer behaviours. The literature review provided the basis for the development of a model of operant sensory systems in humans. This model identifies 13 sensory systems, 8 more than the current approach used by servicescape analysis of the traditional 5 senses."--p. 1.
q-Form fields on p-branes
Creators: name: Fu, Chun-E
name: Liu, Yu-Xiao
name: Yang, Ke
name: Wei, Shao-Wen
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper, we give one general method for localizing any form (q-form) field on p-branes with one extra dimension, and apply it to some typical p-brane models. It is found that, for the thin and thick Minkowski branes with an infinite extra dimension, the zero mode of the q-form fields with q
description: 14 pages, 2 figures, published version
Topologies and structures of the Cremona groups
Creators: name: Blanc, Jérémy
name: Furter, Jean-Philippe
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Geometry (math.AG)
subject: General Topology (math.GN)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 14E07, 20G15, 54H11

description: We study the algebraic structure of the $n$-dimensional Cremona group and show that it is not an algebraic group of infinite dimension (ind-group) if $n\ge 2$. We describe the obstruction to this, which is of a topological nature. By contrast, we show the existence of a Euclidean topology on the Cremona group which extends that of its classical subgroups and makes it a topological group.
description: 20 pages, to appear in Annals of Mathematics
Deep Sea Explorers @ Acqua: sfide dal locale al globale
Creators: name: Hemming, Gary
Publisher: name: Zenodo
Year: 2022

description: 'Deep Sea Explorers' presentation at the 'Acqua: sfide dal locale al globale' event, organised by the Liceo Scientifico Ulisse Dini, at the Stazione Leopolda, Pisa, on the 7th of June, 2022.
Analogue surface gravity near the QCD chiral phase transition
Creators: name: Bilic, Neven
name: Tolic, Dijana
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Using the formalism of relativistic acoustic geometry we study the expanding chiral fluid in the regime of broken chiral symmetry near the QCD chiral phase transition temperature T_c. The dynamics of pions below T_c is described by the equation of motion for a massless scalar field propagating in curved spacetime similar to an open FRW universe. The metric tensor depends locally on the soft pion dispersion relation and the four-velocity of the fluid. In the neighborhood of the critical point an analogue trapped region forms with the analogue trapped horizon as its boundary. We show that the associated surface gravity diverges near the critical point as 1/(T_c-T). Hence, if the horizon forms close to the critical temperature the analogue Hawking temperature may be comparable with or even larger than the background fluid temperature.
description: 11 pages, typos corrected, clarifications added, references added, accepted in Phys. Lett. B
Antike Bronzen aus Aquae/Baden-Baden - Der Bestand der Stadtgeschichtlichen Sammlungen
Creators: name: Knierriem, Peter
name: Löhnig, Elke
Publisher: name: Fundberichte aus Baden-Württemberg
Year: 2019

description: Fundberichte aus Baden-Württemberg, Bd. 22 Nr. 1 (1998): Fundberichte aus Baden-Württemberg
Bronzener Gefäß-Standring mit Punzinschrift aus dem römischen Ladenburg, Rhein-Neckar-Kreis
Creators: name: Wiegels, Rainer
Publisher: name: Fundberichte aus Baden-Württemberg
Year: 2019

description: Fundberichte aus Baden-Württemberg, Bd. 22 Nr. 1 (1998): Fundberichte aus Baden-Württemberg
Non-Equilibrium Quantum Dynamics of Ultra-Cold Atomic Mixtures: the Multi-Layer Multi-Configuration Time-Dependent Hartree Method for Bosons
Creators: name: Krönke, Sven
name: Cao, Lushuai
name: Vendrell, Oriol
name: Schmelcher, Peter
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We develop and apply the multi-layer multi-configuration time-dependent Hartree method for bosons, which represents an ab initio method for investigating the non-equilibrium quantum dynamics of multi-species bosonic systems. Its multi-layer feature allows for tailoring the wave function ansatz in order to describe intra- and inter-species correlations accurately and efficiently. To demonstrate the beneficial scaling and the efficiency of the method, we explore the correlated tunneling dynamics of two species with repulsive intra- and inter-species interactions, to which a third species with vanishing intra-species interaction is weakly coupled. The population imbalances of the first two species can feature a temporal equilibration and their time-evolution significantly depends on the coupling to the third species. Bosons of the first and of the second species exhibit a bunching tendency, whose strength can be influenced by their coupling to the third species.
Autecology, allelopathy and toxicity of Limnothrix (strain AC0243): Multiple-organism studies using laboratory cultures
Creators: name: Daniels, Olivia
Publisher: name: CQUniversity
Year: 2023
Subjects: classificationCode: 310911
subject: Animal structure and function
classificationCode: 321407
subject: Toxicology (incl. clinical toxicology)
classificationCode: 310801
subject: Phycology (incl. marine grasses)

description: This study examines the growth, allelopathy and toxicity of laboratory cultures of the cyanobacterium Limnothrix (strain AC0243). Key findings of the research show evidence that this strain demonstrates ecological plasticity and should be considered as a potentially dangerous invasive species. General observations of the strain under normal (non-experimental) conditions showed extensive plasticity in terms of colony morphology. These forms included floating and non-floating ‘ball’ colonies, well structured colonies attached to the tissue culture flasks, sheets of intertwined trichomes loosely attached to the flasks or planktonic masses. No specific trigger could be attributed to the changes in morphology. Trials were performed to determine if allelopathy occurred between some species of microfungi and Limnothrix (strain AC0243), both of which are commonly recovered from the same niche. The results of these experiments suggested symbiotic or commensual relationships with Fusarium species and Acremonium species but not Cladosporium sphaerospermum. Cladosporium sphaerospermum inhibited growth of the cyanobacterium, although no allelopathy occurred, as determined by the lack of inhibition zones surrounding the colony. Allelopathy occurred when Limnothrix (strain AC0243) was grown Page 5 of 312 with ‘self’ inoculum, suggesting a quorum sensing mediated recognition of antagonism.
Christa Ebnöther, Der römische Gutshof in Dietikon
Creators: name: Hagendorn, Andrea
Publisher: name: Fundberichte aus Baden-Württemberg
Year: 2019

description: Rezension zu: Christa Ebnöther, Der römische GutshoJ in Dietikon. Mit Beiträgen von Hamdallah Bearat, Markus Fischer, Bettina Hedinger, Hans Lieb, Antoinette Rast-Eicher, Marianne Senn-Luder, Johannes Weiss. 438 Seiten, 328 Abbildungen, 96 Tafeln und 1 Beilage. Monographien der Kantonsarchäologie Zürich 25 (Zürich, Egg 1995). ISBN 3-905647-65-6.
description: Fundberichte aus Baden-Württemberg, Bd. 22 Nr. 1 (1998): Fundberichte aus Baden-Württemberg
Unbiased Pairwise Learning from Implicit Feedback for Recommender Systems without Biased Variance Control
Creators: name: Ren, Yi
name: Tang, Hongyan
name: Rong, Jiangpeng
name: Zhu, Siwen
Publisher: name: arXiv
Year: 2023
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Generally speaking, the model training for recommender systems can be based on two types of data, namely explicit feedback and implicit feedback. Moreover, because of its general availability, we see wide adoption of implicit feedback data, such as click signal. There are mainly two challenges for the application of implicit feedback. First, implicit data just includes positive feedback. Therefore, we are not sure whether the non-interacted items are really negative or positive but not displayed to the corresponding user. Moreover, the relevance of rare items is usually underestimated since much fewer positive feedback of rare items is collected compared with popular ones. To tackle such difficulties, both pointwise and pairwise solutions are proposed before for unbiased relevance learning. As pairwise learning suits well for the ranking tasks, the previously proposed unbiased pairwise learning algorithm already achieves state-of-the-art performance. Nonetheless, the existing unbiased pairwise learning method suffers from high variance. To get satisfactory performance, non-negative estimator is utilized for practical variance control but introduces additional bias. In this work, we propose an unbiased pairwise learning method, named UPL, with much lower variance to learn a truly unbiased recommender model. Extensive offline experiments on real world datasets and online A/B testing demonstrate the superior performance of our proposed method.
description: 5 pages