cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Stereo Camera Visual SLAM with Hierarchical Masking and Motion-state Classification at Outdoor Construction Sites Containing Large Dynamic Objects
Creators: name: Bao, Runqiu
name: Komatsu, Ren
name: Miyagusuku, Renato
name: Chino, Masaki
name: Yamashita, Atsushi
name: Asama, Hajime
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: At modern construction sites, utilizing GNSS (Global Navigation Satellite System) to measure the real-time location and orientation (i.e. pose) of construction machines and navigate them is very common. However, GNSS is not always available. Replacing GNSS with on-board cameras and visual simultaneous localization and mapping (visual SLAM) to navigate the machines is a cost-effective solution. Nevertheless, at construction sites, multiple construction machines will usually work together and side-by-side, causing large dynamic occlusions in the cameras' view. Standard visual SLAM cannot handle large dynamic occlusions well. In this work, we propose a motion segmentation method to efficiently extract static parts from crowded dynamic scenes to enable robust tracking of camera ego-motion. Our method utilizes semantic information combined with object-level geometric constraints to quickly detect the static parts of the scene. Then, we perform a two-step coarse-to-fine ego-motion tracking with reference to the static parts. This leads to a novel dynamic visual SLAM formation. We test our proposals through a real implementation based on ORB-SLAM2, and datasets we collected from real construction sites. The results show that when standard visual SLAM fails, our method can still retain accurate camera ego-motion tracking in real-time. Comparing to state-of-the-art dynamic visual SLAM methods, ours shows outstanding efficiency and competitive result trajectory accuracy.
description: This is an Accepted Manuscript of an article published by Taylor & Francis in Advanced Robotics on Jan. 11th, 2021, available online: https://www.tandfonline.com/doi/full/10.1080/01691864.2020.1869586 [Article DOI:10.1080/01691864.2020.1869586]
Integral representation of the linear Boltzmann operator for granular gas dynamics with applications
Creators: name: Arlotti, Luisa
name: Lods, Bertrand
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We investigate the properties of the collision operator associated to the linear Boltzmann equation for dissipative hard-spheres arising in granular gas dynamics. We establish that, as in the case of non-dissipative interactions, the gain collision operator is an integral operator whose kernel is made explicit. One deduces from this result a complete picture of the spectrum of the collision operator in an Hilbert space setting, generalizing results from T. Carleman to granular gases. In the same way, we obtain from this integral representation of the gain operator that the semigroup in $L^1(\R \times \R,\d \x \otimes \d\v)$ associated to the linear Boltzmann equation for dissipative hard spheres is honest generalizing known results from the first author.
description: 19 pages, to appear in Journal of Statistical Physics
Models for the yielding behaviour of amorphous solids
Creators: name: Sastry, Srikanth
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Understanding the mechanical response and failure of solids is of obvious importance in their use as structural materials. The nature of plastic deformation leading to yielding of amorphous solids has been vigorously pursued in recent years. Investigations employing both unidirectional and cyclic deformation protocols reveal a strong dependence of yielding behaviour on the degree of annealing. Below a threshold degree of annealing, the nature of yielding changes qualitatively, to progressively more discontinuous yielding. Theoretical investigations of yielding in amorphous solids have almost exclusively focused on yielding under unidirectional deformation, but cyclic deformation reveals several interesting features that remain largely un-investigated. Focusing on athermal cyclic deformation, I investigate a family of models based on an energy landscape description. These models reproduce key interesting features observed in simulations, and provide an interpretation for the intriguing presence of a threshold energy.
Local high chirality near exceptional points based on asymmetric backscattering
Creators: name: Yang, Jingnan
name: Li, Hancong
name: Yan, Sai
name: Gong, Qihuang
name: Xu, Xiulai
Publisher: name: arXiv
Year: 2024
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We investigate local high chirality inside a microcavity near exceptional points (EPs) achieved via asymmetric backscattering by two internal weak scatterers. At EPs, coalescent eigenmodes exhibit position-dependent and symmetric high chirality characteristics for a large azimuthal angle between the two scatterers. However, asymmetric mode field features appear near EPs. Two azimuthal regions in the microcavity classified by the scatterers exhibit different wave types and chirality. Such local mode field features are attributed to the symmetries of backscattering in direction and spatial distribution. The connections between the wave types, the symmetry of mode field distribution and different symmetries of backscattering near EPs are also analyzed and discussed. Benefiting from the small size of weak scatterers, such microcavities with a high Q/V near EPs can be used to achieve circularly polarized quantum light sources and explore EP modified quantum optical effects in cavity quantum electrodynamics systems.
description: 8pages, 5 figures
Quasi Riesz transforms, Hardy spaces and generalized sub-Gaussian heat kernel estimates
Creators: name: Chen, Li
Publisher: name: The Australian National University
Year: 2018
Subjects: subject: Hardy spaces
subject: Integral transforms
subject: Kernel functions
subject: Riemannian manifolds
subject: Gaussian processes

description: In this thesis, we mainly study Riesz transforms and Hardy spaces associated to operators. The two subjects are closely related to volume growth and heat kernel estimates. In Chapter 1, 2 and 4, we study Riesz transforms on Riemannian manifold and on graphs. In Chapter 1, we prove that on a complete Riemannian manifold, the quasi Riesz transform is always Lp bounded on for p strictly large than 1 and no less than 2. In Chapter 2, we prove that the quasi Riesz transform is also weak L1 bounded if the manifold satisfies the doubling volume property and the sub-Gaussian heat kernel estimate. Similarly, we show in Chapter 4 the same results on graphs. In Chapter 3, we develop a Hardy space theory on metric measure spaces satisfying the doubling volume property and different local and global heat kernel estimates. Firstly we define Hardy spaces via molecules and via square functions which are adapted to the heat kernel estimates. Then we show that the two H1 spaces via molecules and via square functions are the same. Also, we compare the Hp space defined via square functions with Lp. The corresponding Hp space for p large than 1 defined via square functions is equivalent to the Lebesgue space Lp. However, it is shown that in this situation, the Hp space corresponding to Gaussian estimates does not coincide with Lp any more. Finally, as an application of this Hardy space theory, we proved that quasi Riesz transforms are bounded from H1 to L1 on fractal manifolds. In Chapter 5, we consider Vicsek graphs. We prove generalised Poincare inequalities and Sobolev inequalities on Vicsek graphs and we show that they are optimal.
X-ray Spectroscopy of the Highly Magnetized Pulsar PSR J1846-0258, its Wind Nebula and Hosting Supernova Remnant Kes 75
Creators: name: Gotthelf, E. V.
name: Safi-Harb, S.
name: Straal, S. M.
name: Gelfand, J. D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present broad-band X-ray spectroscopy of the energetic components that make up the supernova remnant (SNR) Kesteven 75 using concurrent 2017 Aug 17-20 XMM-Newton and NuSTAR observations, during which the pulsar PSR J1846-0258 is found to be in the quiescent state. The young remnant hosts a bright pulsar wind nebula powered by the highly-energetic (Edot = 8.1E36 erg/s) isolated, rotation-powered pulsar, with a spin-down age of only P/2Pdot ~ 728 yr. Its inferred magnetic field (Bs = 4.9E13 G) is the largest known for these objects, and is likely responsible for intervals of flare and burst activity, suggesting a transition between/to a magnetar state. The pulsed emission from PSR J1846-0258 is well-characterized in the 2-50 keV range by a power-law model with photon index Gamma_PSR = 1.24+/-0.09 and a 2-10 keV unabsorbed flux of (2.3+/-0.4)E-12 erg/s/cm^2). We find no evidence for an additional non-thermal component above 10 keV in the current state, as would be typical for a magnetar. Compared to the Chandra pulsar spectrum, the intrinsic pulsed fraction is 71+/-16% in 2-10 keV band. A power-law spectrum for the PWN yields Gamma_PWN = 2.03+/-0.03 in the 1-55 keV band, with no evidence of curvature in this range, and a 2-10 keV unabsorbed flux (2.13+/-0.02)E-11 erg/s/cm^2. The NuSTAR data reveal evidence for a hard X-ray component dominating the SNR spectrum above 10 keV which we attribute to a dust-scattered PWN component. We model the dynamical and radiative evolution of the Kes 75 system to estimate the birth properties of the neutron star, the energetics of its progenitor, and properties of the PWN. This suggests that the progenitor of Kes 75 was originally in a binary system which transferred most its mass to a companion before exploding.
description: 13 pages, 6 figures, 4 tables; Latex, aastex63 style. Submitted to the Astrophysical Journal
Spectroscopy of Globular Clusters out to Large Radius in the Sombrero Galaxy
Creators: name: Bridges, Terry
name: Rhode, Katherine
name: Zepf, Steve
name: Freeman, Ken
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present new velocities for 62 globular clusters in M104 (NGC 4594, the Sombrero Galaxy), 56 from 2dF on the AAT and 6 from Hydra on WIYN. Combined with previous data, we have a total sample of 108 M104 globular cluster velocities, extending to 20 arcmin radius (~60 kpc), along with BVR photometry for each of these. We use this wide-field dataset to study the globular cluster kinematics and dark matter content of M104 out to 10 arcmin radius (30 kpc). We find no rotation in the globular cluster system. The edge-on nature of M104 makes it unlikely that there is strong rotation which is face-on and hence unobserved; thus, the absence of rotation over our large radial range appears to be an intrinsic feature of the globular cluster system in M104. We discuss ways to explain this low rotation, including the possibility that angular momentum has been transferred to even larger radii through galaxy mergers. The cluster velocity dispersion is ~230 km/s within several arcmin of the galaxy center, and drops to ~150 km/s at ~10 arcmin radius. We derive the mass profile of M104 using our velocity dispersion profile, together with the Jeans equation under the assumptions of spherical symmetry and isotropy, and find excellent agreement with the mass inferred from the stellar and gas rotation curve within 3 arcmin radius. The M/L_V increases from ~4 near the galaxy center to ~17 at 7 arcmin radius (~20 kpc, or 4 R_e), thus giving strong support for the presence of a dark matter halo in M104. More globular cluster velocities at larger radii are needed to further study the low rotation in the globular cluster system, and to see if the dark matter halo in M104 extends beyond a radius of 30 kpc.
description: 40 pages, 7 figures, accepted for publication in ApJ
Ab-initio study of electronic and magnetic properties of Mn$_2$RuZ/MgO (001) heterojunctions (Z= Al, Ga, Si, Ge)
Creators: name: Roy, Tufan
name: Tsujikawa, Masahito
name: Shirai, Masafumi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Using first-principles calculations, we studied Mn$_2$RuZ (Z=Al, Ga, Si, Ge) and their heterojunctions with MgO along (001) direction. All these alloys possess Hg$_2$CuTi-type inverse Heusler alloy structure and ferrimagnetic ground state. Our study reveals the half-metallic electronic structure with highly spin-polarized $Δ_1$ band, which is robust against atomic disorder. Next we studied the electronic structure of Mn$_2$RuAl/MgO and Mn$_2$RuGe/MgO heterojunctions. We found that the MnAl- or MnGe-terminated interface is energetically more favorable compared to the MnRu-terminated interface. Interfacial states appear at the Fermi level in the minority-spin gap for the Mn$_2$RuGe/MgO junction. We discuss the origin of these interfacial states in terms of local environment around each constituent atom. On the other hand, in the Mn$_2$RuAl/MgO junction, high spin polarization of bulk Mn$_2$RuAl is preserved independent of its termination.
description: 15 pages, 7 figures
Inclusion of pairing fluctuations in a semiclassical approach: The case of study of the Josephson effect
Creators: name: Piselli, Verdiana
name: Pisani, Leonardo
name: Strinati, Giancarlo Calvanese
Publisher: name: arXiv
Year: 2024
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Recent refinements on a semiclassical approach are reviewed, aiming at describing the inhomogeneous local gap parameter in the presence of non-trivial spatial geometries and at taking into account at the same time pairing fluctuations beyond mean field. The method is applied to describe the Josephson effect over the wide range of physical conditions related to recent experiments on this topic performed with ultra-cold Fermi gases.
Orthodox Christian Perspectives on War
Creators: name: Hamalis, Perry T.
Publisher: name: University of Notre Dame
Year: 2024

description: \u000aMany regions of the world whose histories include war and violent conflict have or once had strong ties to Orthodox Christianity. Yet policy makers, religious leaders, and scholars often neglect Orthodoxy's resources when they reflect on the challenges of war.\u000a \u000aThrough essays written by prominent Orthodox scholars in the fields of biblical studies, church history, Byzantine studies, theology, patristics, political science, ethics, and biology, _Orthodox Christian Perspectives on War_ presents and examines the Orthodox tradition's nuanced and unique insights on the meaning and challenges of war with an eye toward their contemporary relevance. This volume is structured in three parts: 'Confronting the Present Day Reality,' 'Reengaging Orthodoxy's Tradition,' and 'Constructive Directions in Orthodox Theology and Ethics.' Each exemplifies the value of interdisciplinary reflection on 'war' and the potential for the Eastern Orthodox tradition to enhance ecumenical and interfaith discussions surrounding war in both domestic and international contexts.\u000a \u000aThe contributors do not advance a single account of 'the meaning of war' or a comprehensive and normative stance purporting to be '_the_ Orthodox Christian teaching on war.' Instead, this collection presents the breadth and depth of Orthodox Christian thought in a way that engages Orthodox and non-Orthodox readers alike. In addition to offering fresh resources for all people of good will to understand, prevent, and respond faithfully to war, this book will appeal to Christian theologians who specialize in ethics, to libraries of academic institutions, and to scholars of war/peace studies, international relations, and Orthodox thought.\u000a \u000aContributors: Peter C. Bouteneff, George Demacopoulos, John Fotopoulos, Brandon Gallaher, Perry T. Hamalis, Valerie A. Karras, Alexandros K. Kyrou, Aristotle Papanikolaou, Elizabeth H. Prodromou, Nicolae Roddy, James C. Skedros, Andrew Walsh, and Gayle E. Woloschak.\u000a
title: Extending EU Governmentality to the eastern neighbourhood: A Study of Knowledge Production, Governing Technologies and Micro-Practices in the EU management of Cross-Border Mobility
Creators: name: Merheim-Eyre, Igor
Publisher: name: University of Kent
Year: 2017

description: Based on Foucault's work on the rationalities of government (governmentality) and Bourdieu's study of practices (philosophy of action), this thesis seeks to examine the case of cross-border mobility by way of analysing knowledge-production, instruments of governing and practices in the EU's relations with the states of the Eastern Partnership (EaP). The thesis shows that EU attempts at governing cross-border mobility do not merely aim to foster regulated mobility between the EU and its neighbours, but are also inherently linked to the EU's efforts to shape the EaP states to its own standards and practices of governing. Using the case studies of i) border management capacity-building, ii) facilitation of short-term travel and iii) labour migration, the study argues that while the EU's rationalities of governing remain largely controlling and disciplinary, the study of the microcosm of daily practices reveals some emergent rationalities of 'governing at a distance', which increasingly draw on the interplay of both the EU's interests and partners' needs. To this end, it does not merely present issues of cross-border mobility from the perspective of either 'inclusion' or 'imposition of constraints', but rather by way of seeking to govern the external space by making the Other 'capable of bearing a kind of regulated freedom' (Rose & Miller; 2008: 53). The thesis' key contributions are (i) conceptual involving ontological examination of the wider changes in the EU management of (in)security, and focus of a paradigmatic shift from the EU directly-controlling 'governance' to a more nuanced form of diffused 'governmentality', or governing at distance, and its effectiveness; and (ii) methodological, combining the study of knowledge-production and instruments of governing with daily practices, hitherto applied separately, but in this research proving instrumental for understanding the EU management of insecurities and its sustainability. Empirically (iii), the thesis provides new data on the three case studies, particularly, highlighting the extent to which the EU's attempts at governing are transposed to the micro-level of daily practices. In the context of the on-going migration crisis, the eastern neighbourhood provides some important lesson-drawing for the management of cross-border mobility in the wider neighbourhood and beyond.
CsV$_3$Sb$_5$: a $\mathbb{Z}_2$ topological kagome metal with a superconducting ground state
Creators: name: Ortiz, Brenden R.
name: Teicher, Samuel M. L.
name: Hu, Yong
name: Zuo, Julia L.
name: Sarte, Paul M.
name: Schueller, Emily C.
name: Abeykoon, A. M. Milinda
name: Krogstad, Matthew J.
name: Rosenkranz, Stefan
name: Osborn, Raymond
name: Seshadri, Ram
name: Balents, Leon
name: He, Junfeng
name: Wilson, Stephen D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Recently discovered alongside its sister compounds KV$_3$Sb$_5$ and RbV$_3$Sb$_5$, CsV$_3$Sb$_5$ crystallizes with an ideal kagome network of vanadium and antimonene layers separated by alkali metal ions. This work presents the electronic properties of CsV$_3$Sb$_5$, demonstrating bulk superconductivity in single crystals with a T$_{c} = 2.5$K. The normal state electronic structure is studied via angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT), which categorize CsV$_3$Sb$_5$ as a $\mathbb{Z}_2$ topological metal. Multiple protected Dirac crossings are predicted in close proximity to the Fermi level ($E_F$), and signatures of normal state correlation effects are also suggested by a high temperature charge density wave-like instability. The implications for the formation of unconventional superconductivity in this material are discussed.
description: 6 pages, 4 figures
Discrete Scale Invariance in Scale Free Graphs
Creators: name: Graña, Matías
name: Pinasco, Juan Pablo
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: In this work we introduce an energy function in order to study finite scale free graphs generated with different models. The energy distribution has a fractal pattern and presents log periodic oscillations for high energies. This oscillations are related to a discrete scale invariance of certain graphs, that is, there are preferred scaling ratios suggesting a hierarchical distribution of node degrees. On the other hand, small energies correspond to graphs with evenly distributed degrees.
description: 13 pages, 12 figures
The Sources of Kolmogorov's Grundbegriffe
Creators: name: Shafer, Glenn
name: Vovk, Vladimir
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: Andrei Kolmogorov's Grundbegriffe der Wahrscheinlichkeits-rechnung put probability's modern mathematical formalism in place. It also provided a philosophy of probability--an explanation of how the formalism can be connected to the world of experience. In this article, we examine the sources of these two aspects of the Grundbegriffe--the work of the earlier scholars whose ideas Kolmogorov synthesized.
description: Published at http://dx.doi.org/10.1214/088342305000000467 in the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Collective dynamics in coupled maps on a lattice with quenched disorder
Creators: name: Giacometti, Achille
name: Rossi, Maurice
name: Battiston, Libero
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: It is investigated how a spatial quenched disorder modifies the dynamics of coupled map lattices. The disorder is introduced via the presence or absence of coupling terms among lattice sites. Two nonlinear maps have been considered embodying two paradigmatic dynamics. The Miller and Huse map can be associated with an Ising-like dynamics, whereas the logistic coupled maps is a prototype of a non trivial collective dynamics. Various indicators quantifying the overall behavior, demonstrates that even a small amount of spatial disorder is capable to alter the dynamics found for purely ordered cases.
description: 27 pages, 15 figures, accepted for publication in Phys. Rev. E
title: Safeguarding the worker : job hazards and the role of the law
title: Smart regulation : designing environmental policy
titleType: AlternativeTitle
title: Regulating workplace safety : system and sanctions
titleType: AlternativeTitle
Creators: name: Gunningham, Neil
Publisher: name: Canberra, ACT : The Australian National University
Year: 2018
Subjects: subject: Industrial safety Law and legislation
subject: Industrial hygiene Law and legislation
subject: Environmental law
subject: Environmental policy

description: [v.1]. Safeguarding the worker : job hazards and the role of the law / by Neil Gunningham (1984)--[v.2]. Smart regulation : designing environmental policy / Neil Gunningham, Peter Grabosky, with Darren Sinclair (1998)--[v.3]. Regulating workplace safety : system and sanctions / Neil Gunningham and Richard Johnstone (1999)
description: [v.1]. Safeguarding the worker : job hazards and the role of the law / by Neil Gunningham (1984) -- [v.2]. Smart regulation : designing environmental policy / Neil Gunningham, Peter Grabosky, with Darren Sinclair (1998) -- [v.3]. Regulating workplace safety : system and sanctions / Neil Gunningham and Richard Johnstone (1999)
The impact of learners' characteristics on m-learning preferences, and how m-learning preferences form choices in different contexts
Creators: name: Al Ismail, Mazen Ibrahim I
Publisher: name: The Australian National University
Year: 2018
Subjects: Human computer interaction
mobile learning preferences
learners' characteristics
m-learning preferences
VARK
personality traits
m-learning choices
podcasts preferences and choices
m-learning context

description: Students adopt different strategies, show a range of preferences, and make individual choices as they learn to learn effectively and efficiently. Facilitating students to customise their own preferred techniques will maximise students’ learning. Mobile devices allow learning to occur anywhere and at any time. However, the nature of mobile devices, such as the need to access a digital format on devices with small screens, influence students’ e-learning preferences. There is now a growing research effort which aims to understand learners’ mobile learning preferences to deliver digital learning materials that best satisfy learners’ needs. This thesis explores mobile learning (m-learning) preferences and choices in tertiary education to understand the best approaches to deliver digital learning materials (podcasts) in different physical (e.g. quiet, busy, or walking) and social spaces (e.g. alone, family, or with classmates). This study uses two quantitative methods to understand mobile learners’ preferences and choices. First, 345 students completed a survey study concerning the role of mobile learners’ characteristics on podcast preferences in different physical and social spaces. Characteristics which are included in this study are gender, age, nationality (Australian and Saudi), materials status, prior experience of podcasting, learning style, and personality traits. Second, 95 students participated in three experimental studies to examine whether mobile learners’ preferences for podcasts reflect their real choices in two different physical spaces which are quiet (e.g. home or library) and busy (e.g. cafe). Overall, the results show that differences in characteristics affect m-learning preferences in some contexts (the result of overlapping physical and social spaces). On the other hand, preferences were reliable in predicting students’ choices only in limited physical spaces. The reason behind these findings are discussed in this thesis. The approaches proposed in the provide ways to understand mobile learners’ preferences and choices, taking in to account a novel method which is a person’s spatial and social contexts.
Tangential Quantum Cohomology of Arbitrary Order
Creators: name: Colley, S. J.
name: Kennedy, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14N35 (Primary) 14C17, 14D22 (Secondary)

description: J. Kock has previously defined a tangency quantum product on formal power series with coefficients in the cohomology ring of any smooth projective variety, and thus a ring that generalizes the quantum cohomology ring. We further generalize Kock's construction by defining a dth-order contact product and establishing its associativity.
description: 18 pages, LaTeX. We correct our paper to work in the correct context, viz., using numerical equivalence (rather than rational equivalence) and explicitly mentioning the Novikov ring
Increasing the Accuracy of Binary Neutron Star Simulations with an improved Vacuum Treatment
Creators: name: Poudel, Amit
name: Tichy, Wolfgang
name: Brügmann, Bernd
name: Dietrich, Tim
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Numerical relativity simulations are essential to study the last stages of the binary neutron star coalescence. Unfortunately, for stable simulations there is the need to add an artificial low-density atmosphere. Here we discuss a new framework in which we can effectively set the density surrounding the neutron stars to zero to ensure a more accurate simulation. We test our method with a number of single star test cases and for an equal mass binary neutron star simulation. While the bulk motion of the system is not influenced, and hence, there is no improvement with respect to the emitted gravitational-wave signal, we find that the new approach is superior with respect to mass conservation and it allows a much better tracking of outward moving material. This will allow a more accurate simulation of the ejected material and supports the interpretation of present and future multi-messenger observations with more accurate numerical relativity simulations.
description: 16 pages, 11 figures, 4 tables
Invariance principles for random walks conditioned to stay positive
Creators: name: Caravenna, Francesco
name: Chaumont, Loïc
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: Let $\{S_n\}$ be a random walk in the domain of attraction of a stable law $\mathcal{Y}$, i.e. there exists a sequence of positive real numbers $(a_n)$ such that $S_n/a_n$ converges in law to $\mathcal{Y}$. Our main result is that the rescaled process $(S_{\lfloor nt\rfloor}/a_n, t\ge 0)$, when conditioned to stay positive, converges in law (in the functional sense) towards the corresponding stable Lévy process conditioned to stay positive. Under some additional assumptions, we also prove a related invariance principle for the random walk killed at its first entrance in the negative half-line and conditioned to die at zero.
description: Published in at http://dx.doi.org/10.1214/07-AIHP119 the Annales de l'Institut Henri Poincar\'e - Probabilit\'es et Statistiques (http://www.imstat.org/aihp/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Restless landscapes: spatial economic restructuring in China’s lower Yangzi delta
Creators: name: Marton, Andrew Mark
Publisher: name: University of British Columbia
Year: 2009

description: The development of market socialism in China has contributed to a spatial economic transformation characterized, among other things, by the apparent capacity to rapidly industrialize without transferring large numbers of people into big cities. The most striking element of this transformation has been the phenomenal growth and spatial proliferation of industries in particular areas of the Chinese countryside. The conventional wisdom of existing theories of development, industrialization, and urbanization does not adequately explain the emergence of these relatively productive regions. This thesis examines the key patterns and underlying processes and mechanisms which must be accommodated in a new analytical and conceptual framework for understanding rural transformation and the wider spatial economic restructuring in China's lower Yangzi delta. The overall objective is to explore the theoretical implications of the local character of regional change through an evaluation of a hypothetical model of mega-urbanization. The model situates the emergence and specific patterns of industrial production within a complex network of interactions and interrelationships embedded in overlapping administrative and institutional structures which are themselves largely tied to the circumstances of particular places. The resulting investigations are based upon an analysis of regional and local level statistical and other documentary sources, numerous interviews, field observations, and a survey questionnaire of rural enterprises which was part of a detailed case study of one county level area in the lower Yangzi delta. Two central findings are revealed. First, the patterns and underlying processes and mechanisms of regional development in the delta are fundamentally linked to intensely localized exigencies and opportunities within the wider Chinese space economy. Second, external economies, the dynamics of agglomeration, and the role of large cities and other exogenous forces, while significant, were less important in the delta than were endogenous forces. The details of these findings are incorporated into a revised model of mega-urbanization which highlights the critical processes and mechanisms which underlie the patterns observed, what establishes these processes and mechanisms, and what stabilizes and reproduces them. The thesis concludes by suggesting an agenda for the creation of appropriate planning and management responses for the lower Yangzi delta region.
Signal-to-Noise Ratio in Squeezed-Light Laser Radar
Creators: name: Rubin, Mark A.
name: Kaushik, Sumanth
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The formalism for computing the signal-to-noise ratio (SNR) for laser radar is reviewed and applied to the tasks of target detection, direction-finding, and phase change estimation with squeezed light. The SNR for heterodyne detection of coherent light using a squeezed local oscillator is lower than that obtained using a coherent local oscillator. This is true for target detection, for phase estimation, and for direction-finding with a split detector. Squeezing the local oscillator also lowers SNR in balanced homodyne and heterodyne detection of coherent light. Loss places an upper bound on the improvement that squeezing can bring to direct-detection SNR.
description: Typos corrected
Experiment procedure
Creators: name: Chaiyapha, Sidawun
name: Intanai, Thongwilai
name: Lau-Preechathammarach, Raksit Tyler
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: subject: kdt

description: Discussion of experiment procedure and stimuli. Recorder: Zoom H4n. Microphone: C544-L Headset Microphone (x2).
Probing Landau quantisation with the presence of insulator-quantum Hall transition in a GaAs two-dimensional electron system
Creators: name: Chen, Kuang Yao
name: Chang, Y. H.
name: Liang, C. -T.
name: Aoki, N.
name: Ochiai, Y.
name: Huang, C. F.
name: Lin, Li-Hung
name: Cheng, K. A.
name: Cheng, H. H.
name: Lin, H. H.
name: Wu, Jau-Yang
name: Lin, Sheng-Di
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Magneto-transport measurements are performed on the two-dimensional electron system (2DES) in an AlGaAs/GaAs heterostructure. By increasing the magnetic field perpendicular to the 2DES, magnetoresistivity oscillations due to Landau quantisation can be identified just near the direct insulator-quantum Hall (I-QH) transition. However, different mobilities are obtained from the oscillations and transition point. Our study shows that the direct I-QH transition does not always correspond to the onset of strong localisation.
description: 11 pages, 7 figures
Chiral current circulation and $\mathcal{PT}$ symmetry in a trimer of oscillators
Creators: name: Downing, Charles A.
name: Zueco, David
name: Martín-Moreno, Luis
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a simple quantum theory of a bosonic trimer in a triangular configuration, subject to gain and loss in an open quantum systems approach. Importantly, the coupling constants between each oscillator are augmented by complex arguments, which give rise to various asymmetries. In particular, one may tune the complex phases to induce chiral currents, including the special case of completely unidirectional (or one-way) circulation when certain conditions are met regarding the coherent and incoherent couplings. When our general theory is recast into a specific non-Hermitian Hamiltonian, we find interesting features in the trimer population dynamics close to the exceptional points between phases of broken and unbroken $\mathcal{PT}$ symmetry. Our theoretical work provides perspectives for the experimental realization of chiral transport at the nanoscale in a variety of accessible nanophotonic and nanoplasmonic systems, and paves the way for the potential actualization of nonreciprocal devices.
description: 14 pages, 11 figures
The double edged sword : the role of nuclear weapons in South Asia
Creators: name: Karki, Rohit
Publisher: name: The Australian National University
Year: 2018
Subjects: subject: UA840.K37 2011
subject: Nuclear weapons India
subject: Nuclear weapons Pakistan
subject: India Foreign relations Pakistan
subject: Pakistan Foreign relations India
subject: India Politics and government 1977-
subject: Pakistan Politics and government 1988-

description: This thesis exammes the consequences of nuclear proliferation on South Asia, specifically whether India and Pakistan are moving towards a stable nuclear balance. The thesis uses comparative case study methods to examine the role of nuclear weapons in crises and the lessons learnt from those crises. The thesis argues that nuclear weapons have played the dual role of crisis instigator and crisis manager in South Asia. That is, nuclear weapons have contributed to the outbreak of crises predominantly by empowering Pakistan to provoke India. However, once these crises were underway, the fear of escalation to nuclear war prompted considerable restraint and hence nuclear weapons can be understood to have also played a role of crisis manager. Furthermore, although India and Pakistan's growing nuclear arsenals, nuclear doctrines and command and control systems have exhibited complexity of deterrence, the evolving nuclear learning in India and Pakistan limits the likelihood of nuclear weapons use during a crisis. The thesis demonstrates that the role of nuclear weapons in South Asia can be best understood through this dual characterisation and that we may exercise sober optimism for the stability of nuclear deterrence in South Asia.
Electron microscopy and spectroscopic study of structural changes, electronic properties and conductivity in annealed Li$_x$CoO$_2$
Creators: name: Volkova, Halyna
name: Pachuta, Kevin
name: Crowley, Kyle
name: Radha, Santosh Kumar
name: Pentzer, Emily
name: Gao, Xuan P. A.
name: Lambrecht, Walter R. L.
name: Sehirlioglu, Alp
name: Berger, Marie-Hélène
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Chemically exfoliated nanoscale few-layer thin Li$_x$CoO$_2$ samples are studied as function of annealing at various temperatures, using transmission electron microscopy (TEM) and Electron Energy Loss Spectroscopies (EELS), probing the O-K, Co-L$_{2,3}$ spectra along with low energy interband transitions. These spectra are compared with first-principles DFT calculations of -Im$[\varepsilon^{-1}(q,ω)]$ and O-2p Partial Densities of States weighted by dipole matrix elements with the core wavefunction and including the O-1s core-hole and with known trends of the L$_2$/L$_3$ peak ratio to average Co valence. Trends in these spectra under the annealing procedures are established and correlated with the structural phase changes observed from diffraction TEM and High Resolution TEM images. The results are also correlated with conductivity measurements on samples subjected to the same annealing procedures. A gradual disordering of the Li and Co cations in the lattice is observed starting from a slight distortion of the pure LiCoO$_2$ $R\bar{3}m$ to $C2/m$ due to the lower Li content, followed by a $P2/m$ phase forming at 200$^o$C indicative of Li-vacancy ordering, formation of a spinel type $Fd\bar{3}m$ phase around 250$^o$C and ultimately a rocksalt type $Fm\bar{3}m$ phase above 350$^o$C. This disordering leads to a lowering of the band gap as established by low energy EELS. The O-K spectra of the rocksalt phase are only reproduced by a calculation for pure CoO and not for a model with random distribution of Li and Co. This indicates that there may be a loss of Li from the rocksalt regions of the sample at these higher temperatures. The conductivity measurements indicate a gradual drop in conductivity above 200$^o$C, which is clearly related to the more Li-Co interdiffused phases, in which a low-spin electronic structure is no longer valid and stronger correlation effects are expected.
Negative Echo in the Density Evolution of Ultracold Fermionic Gases
Creators: name: Fumarola, F.
name: Ahmadian, Y.
name: Aleiner, I. L.
name: Altshuler, B. L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We predict a nonequilibrium critical phenomenon in the space-time density evolution of a fermionic gas above the temperature of transition into the superfluid phase. On the BCS side of the BEC-BCS crossover, the evolution of a localized density disturbance exhibits a negative echo at the point of the initial inhomogeneity. Approaching the BEC side, this effect competes with the slow spreading of the density of bosonic molecules. However, even here the echo dominates for large enough times. This effect may be used as an experimental tool to locate the position of the transition.
description: 4 pages, 2 figures
Indigenous Languages, Politics, and Authority in Latin America: Historical and Ethnographic Perspectives
Creators: name: Durston, Alan
Publisher: name: University of Notre Dame
Year: 2024

description: This volume makes a vital and original contribution to a topic that lies at the intersection of the fields of history, anthropology, and linguistics. The book is the first to consider indigenous languages as vehicles of political orders in Latin America from the sixteenth century to the present, across regional and national contexts, including Peru, Mexico, Guatemala, and Paraguay. The chapters focus on languages that have been prominent in multiethnic colonial and national societies and are well represented in the written record: Guarani, Quechua, some of the Mayan languages, Nahuatl, and other Mesoamerican languages. The contributors put into dialogue the questions and methodologies that have animated anthropological and historical approaches to the topic, including ethnohistory, philology, language politics and ideologies, sociolinguistics, pragmatics, and metapragmatics. Some of the historical chapters deal with how political concepts and discourses were expressed in indigenous languages, while others focus on multilingualism and language hierarchies, where some indigenous languages, or language varieties, acquired a special status as mediums of written communication and as elite languages. The ethnographic chapters show how the deployment of distinct linguistic varieties in social interaction lays bare the workings of social differentiation and social hierarchy.\u000a\u000aContributors: Alan Durston, Bruce Mannheim, Sabine MacCormack, Bas van Doesburg, Camilla Townsend, Capucine Boidin, Ang\u00e9lica Otaz\u00fa Melgarejo, Judith M. Maxwell, Margarita Huayhua.
Determinants of Entrepreneurial Competencies Development Among Startups in Lagos
Creators: name: LADOKUN, I. O.
Publisher: name: gjrpublication
Year: 2024

description: The study aimed to investigate the factors that contribute to entrepreneurial competencies development in startups operating in Lagos. Using a cross-sectional and explanatory design, data from 218 startups in Lagos, who had businesses in fintech, retailing, marketing/distribution, mobility, health, legal, and prop-tech were gathered and analyzed. The sample size was determined using the Taro Yamane formula. The study found that entrepreneurship competencies are determined by one's educational level, professional experience, family business background, and pre-startup training. It was revealed that only training before embarking on the startup had a significant influence on entrepreneurial competence. The R2 = 0. 025, which implies that training before a startup business accounts for 2.5% of the total variability in entrepreneurial competencies. The primary predictor of entrepreneurial competencies development was the training that one received before starting the business (β=0.473 and significant). It implies that policymakers and the entrepreneurial community should invest more in entrepreneurial training and education. The study investigated the factors that drive entrepreneurial capacity development in Nigerian Startups across various sectors of the economy. The startup ecosystem's development in Lagos and other major cities in Nigeria has made this matter crucial.
On subelliptic equations on stratified Lie groups driven by singular nonlinearity and weak $L^1$ data
Creators: name: Sahu, S.
name: Choudhuri, D.
name: Repovš, D. D.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Analysis of PDEs (math.AP)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 35R35, 35Q35, 35J20, 46E35

description: The article is about an elliptic problem defined on a {\it stratified Lie group}. Both sub- and superlinear cases are considered whose solutions are guaranteed to exist in light of the interplay between the nonlinearities and the weak $L^1$ datum. The existence of infinitely many solutions is proved for suitable values of $λ,p,q$ by using the Symmetric Mountain Pass Theorem.
Deriving Spin of the Bosonic String
Creators: name: Salesi, Giovanni
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Exploiting the strict analogy between the motion of strings and extended-like spinning particles, we propose an original kinematical formulation of the spin of bosonic strings and give, for the first time, an analytical derivation of an explicit expression of the string spin vector.
The Frisch--Waugh--Lovell Theorem for Standard Errors
Creators: name: Ding, Peng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistics Theory (math.ST)
subject: Econometrics (econ.EM)
subject: Methodology (stat.ME)
subject: FOS: Mathematics
subject: FOS: Economics and business
subject: FOS: Computer and information sciences

description: The Frisch--Waugh--Lovell Theorem states the equivalence of the coefficients from the full and partial regressions. I further show the equivalence between various standard errors. Applying the new result to stratified experiments reveals the discrepancy between model-based and design-based standard errors.
Lunch with host family
Creators: name: Intanai, Thongwilai
name: Janthong, Mi
name: Lau-Preechathammarach, Raksit Tyler
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: subject: kdt

description: Conversation over lunch with host family. Other voices included. Recorder: Zoom H4n. Microphone: internal.