cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
MPEC 2023-Y31 : 2023 YD
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 YD

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
The No-Boundary Measure in the Regime of Eternal Inflation
Creators: name: Hartle, James
name: Hawking, S. W.
name: Hertog, Thomas
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The no-boundary wave function (NBWF) specifies a measure for prediction in cosmology that selects inflationary histories and remains well behaved for spatially large or infinite universes. This paper explores the predictions of the NBWF for linear scalar fluctuations about homogeneous and isotropic backgrounds in models with a single scalar field moving in a quadratic potential. We treat both the space-time geometry of the universe and the observers inhabiting it quantum mechanically. We evaluate top-down probabilities for local observations that are conditioned on the NBWF and on part of our data as observers of the universe. For models where the most probable histories do not have a regime of eternal inflation, the NBWF predicts homogeneity on large scales, a specific non-Gaussian spectrum of observable fluctuations, and a small amount of inflation in our past. By contrast, for models where the dominant histories have a regime of eternal inflation, the NBWF predicts significant inhomogeneity on scales much larger than the present horizon, a Gaussian spectrum of observable fluctuations, and a long period of inflation in our past. The absence or presence of local non-Gaussianity therefore provides information about the global structure of the universe, assuming the NBWF.
description: 29 pages, 8 figures
Beyond semantic association : a TMS study investigating gestures, verbs, and the motor cortex
Creators: name: Mertens, Bradley James
Publisher: name: University Of Tasmania
Year: 2023

description: The following is a review that broadly examines literature on the links between language processing and the motor cortex. The review is arranged in four main sections. The first is an exploration of the traditional views of language processing, including both expression and comprehension. The second is an examination of the evolution of language, and how spoken language may be the descendant of manual communication. Within this second section, the review also examines the emerging literature on mirror-neurons and how they are involved in linking language and action. Third is an examination of the literature on manual communication including papers on both gesture and sign language. This section also reviews the studies that examine clinical disorders with symptoms that include deficits in both language and motor function. Last is a review of the literature on the neurocognitive studies that have examined the links between motor cortex and the processing of motor related language. This section includes literature on language studies using transcranial magnetic stimulation over the motor cortex.
Poisson Thickening
Creators: name: Gurel-Gurevich, Ori
name: Peled, Ron
Publisher: name: arXiv
Year: 2009
Subjects: subject: Probability (math.PR)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 60g55, 37A50

description: Let X be a Poisson point process of intensity lambda on the real line. A thickening of it is a (deterministic) measurable function f such that the union of X and f(X) is a Poisson point process of intensity lambda' where lambda'>lambda. An equivariant thickening is a thickening which commutes with all shifts of the line. We show that a thickening exists but an equivariant thickening does not. We prove similar results for thickenings which commute only with integer shifts and in the discrete and multi-dimensional settings. This answers 3 questions of Holroyd, Lyons and Soo. We briefly consider also a much more general setup in which we ask for the existence of a deterministic coupling satisfying a relation between two probability measures. We present a conjectured sufficient condition for the existence of such couplings.
description: Added conjecture about when a deterministic coupling satisfying a relation exists. Made some minor revisions. To appear in Israel Journal of Mathematics. 16 pages
Maestro 2022 Extensibility Test
Creators: name: Magalhães Serra, Alexandre
name: Estima, Jacinto
name: Rodrigues da Silva, Alberto
Publisher: name: Zenodo
Year: 2023

description: These files were utilized in an extensibility test conducted on the Maestro platform and are referenced in the publication titled "Evaluation of Maestro, an extensible general-purpose data gathering and data classification platform"
Strong associations between microbe phenotypes and their network architecture
Creators: name: Roy, Soumen
name: Filkov, Vladimir
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Understanding the dependence and interplay between architecture and function in biological networks has great relevance to disease progression, biological fabrication and biological systems in general. We propose methods to assess the association of various microbe characteristics and phenotypes with the topology of their networks. We adopt an automated approach to characterize metabolic networks of 32 microbial species using 11 topological metrics from complex networks. Clustering allows us to extract the indispensable, independent and informative metrics. Using hierarchical linear modeling, we identify relevant subgroups of these metrics and establish that they associate with microbial phenotypes surprisingly well. This work can serve as a stepping stone to cataloging biologically relevant topological properties of networks and towards better modeling of phenotypes. The methods we use can also be applied to networks from other disciplines.
description: Replaced by the version scheduled to appear in Phys. Rev. E (Rapid Comm.)
El modernismo como una crítica estética en Latinoamérica: una reflexión desde Walter Bejamín y José Ortega y Gasset
Creators: name: Zuniga Mejía, Rafael Antonio
Publisher: name: Zenodo
Year: 2023

description: La nueva propuesta literaria hispanoamericana de finales del siglo XIX resalta a los escritores del modernismo como la manifestación cultural de una nueva sensibilidad estética que les permitió adquirir plenitud y autonomía. En ese sentido, para poder comprender el desarrollo histórico y filosófico del modernismo como movimiento literario, se analizan algunas ideas del pensamiento de Walter Benjamín al referirse a las circunstancias y condiciones materiales del poeta Charles Baudelaire al comenzar una nueva escena poética en Francia, influyendo de sobremanera a los poetas del modernismo. Además, en la filosofía de José Ortega y Gasset, se analiza la contraposición entre el arte nuevo y el estancamiento en valores tradicionales en la cultura española durante el siglo XIX, lo que impide que una nueva sensibilidad artística y política se logre desarrollar, situación que le resta para continuar como centro cultural de la América Hispana, porque permite identificar valores orientados al antiimperialismo y lo decolonial.
Unconventional phenomenology of a minimal two-Higgs-doublet model
Creators: name: de Visscher, Simon
name: Gerard, Jean-Marc
name: Herquet, Michel
name: Lemaitre, Vincent
name: Maltoni, Fabio
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Two-Higgs-doublet models (2HDM) are simple extensions of the Standard Model (SM) where the scalar sector is enlarged by adding a weak doublet. As a result, the Higgs potential depends in general on several free parameters which have to be carefully chosen to give predictions consistent with the current precision data. We consider a 2HDM invariant under a twisted custodial symmetry and depending only on three extra parameters beyond the SM ones. This model naturally features an inverted mass spectrum with a light pseudoscalar state and a heavy SM-like Higgs boson. We thoroughly analyze direct and indirect constraints and present a few unconventional though promising signatures at the LHC.
description: 37 pages, 20 figures
Gaussian Mixture Reduction via Clustering
Creators: name: Huber, Marco F.
name: Schieferdecker, Dennis
Publisher: name: Karlsruhe
Year: 2009

description: Recursive processing of Gaussian mixture functions inevitably leads to a large number of mixture components. In order to keep the computational complexity at a feasible level, the number of their components has to be reduced periodically. There already exists a variety of algorithms for this purpose, bottom-up and top-down approaches, methods that take the global structure of the mixture into account or that work locally and consider few mixture components at the same time. The mixture reduction algorithm presented in this paper can be categorized as global top-down approach. It takes a clustering algorithm originating from the field of theoretical computer science and adapts it for the problem of Gaussian mixture reduction. The achieved results are on the same scale as the results of the current “state-of-the-art” algorithm PGMR, but, depending on the input size, the whole procedure performs significantly faster.
A Novel Haptic Interface for Extended Range Telepresence: Control and Evaluation
Creators: name: Pérez Arias, A.
name: Hanebeck, Uwe D.
Publisher: name: Karlsruhe
Year: 2009

description: A novel haptic interface for extended range telepresence is presented that allows the user simultaneous wide area motion and haptic interaction in remote environments. To achieve an extended workspace, the haptic interface consists of a haptic manipulator for precise haptic rendering and a large portal carrier system that enlarges the workspace by prepositioning the end-effector. As the prepositioning unit is grounded and driven by three linear drives, our approach has the advantages of high force capability, and an accurate positioning of the haptic interface. The use of this haptic interface with Motion Compression permits to explore large remote environments even from small user environments. As a result, not only has the user visual, acoustic, and haptic feedback but can also control the teleoperator or avatar by natural walking, which considerably increases the sense of immersion. A prototype system for haptic extended range telepresence was designed, implemented, and tested.
Transgression to Loop Spaces and its Inverse, I: Diffeological Bundles and Fusion Maps
Creators: name: Waldorf, Konrad
Publisher: name: arXiv
Year: 2009
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: We prove that isomorphism classes of principal bundles over a diffeological space are in bijection to certain maps on its free loop space, both in a setup with and without connections on the bundles. The maps on the loop space are smooth and satisfy a "fusion" property with respect to triples of paths. Our bijections are established by explicit group isomorphisms: transgression and regression. Restricted to smooth, finite-dimensional manifolds, our results extend previous work of J. W. Barrett.
description: 45 pages, 1 figure. v2: parts of the appendix have been moved to the main text, many small improvements. v3: references updates; v3 is the published version
A Particle Method for a Collisionless Plasma with Infinite Mass
Creators: name: Pankavich, Stephen
Publisher: name: arXiv
Year: 2010
Subjects: subject: Numerical Analysis (math.NA)
subject: Analysis of PDEs (math.AP)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The one-dimensional Vlasov-Poisson system is considered and a particle method is developed to approximate solutions without compact support which tend to a fixed background of charge as $| x | \to \infty$. Such a system of equations can be used to model kinetic phenomena occurring in plasma physics, such as the solar wind. The particle method is constructed, implemented, and used to determine information regarding the time asymptotics of the electrostatic field.
description: 10 pages, 5 figures, 3 tables; submitted to Mathematics and Computers in Simulation
Remarks on Grassmannian Symmetric Spaces
Creators: name: Zalabova, Lenka
name: Zadnik, Vojtech
Publisher: name: arXiv
Year: 2009
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C15; 53A40; 53C05; 53C35

description: The classical concept of affine locally symmetric spaces allows a generalization for various geometric structures on a smooth manifold. We remind the notion of symmetry for parabolic geometries and we summarize the known facts for $|1|$--graded parabolic geometries and for almost Grassmannian structures, in particular. As an application of two general constructions with parabolic geometries, we present an example of non--flat Grassmannian symmetric space. Next we observe there is a distinguished torsion--free affine connection preserving the Grassmannian structure so that, with respect to this connection, the Grassmannian symmetric space is an affine symmetric space in the classical sense.
description: 14 pages
Two-dimensional boson-fermion mixtures
Creators: name: Subasi, A. L.
name: Sevincli, S.
name: Vignolo, P.
name: Tanatar, B.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Using mean-field theory, we study the equilibrium properties of boson-fermion mixtures confined in a harmonic pancake-shaped trap at zero temperature. When the modulus of the s-wave scattering lengths are comparable to the mixture thickness, two-dimensional scattering events introduce a logarithmic dependence on density in the coupling constants, greatly modifying the density profiles themselves. We show that for the case of a negative boson-fermion three-dimensional s-wave scattering length, the dimensional crossover stabilizes the mixture against collapse and drives it towards spatial demixing.
description: 9 pages, 4 figures
Decriminalising public drunkenness: accountability and monitoring needed in the ongoing and evolving management of public intoxication
Creators: name: Pennay, Amy
name: Savic, M
name: Seear, Kate
name: Volpe, I
name: Manning, V
name: Room, Robin
Publisher: name: La Trobe
Year: 2023
Subjects: classificationCode: 42
subject: Health sciences
subject: FOS: Health sciences
classificationCode: 52
subject: Psychology
subject: FOS: Psychology
classificationCode: 44
subject: Human society

description: In light of the recent announcement from the Victorian (Australia) state government that they are moving to decriminalise public drunkenness and replace it with a ‘health-based response’, it is timely to reflect on a number of important considerations identified from the academic literature on this topic. We briefly review a number of models of health-care delivery that have been utilised in other jurisdictions, and suggest there are opportunities at a more principled level to respond more adequately to the decriminalisation of public drunkenness in Victoria (and elsewhere). First, embedding research and evaluation, particularly that draws on the needs, views and experiences of those who are deemed to be drunk in public, is essential from the outset, and must be ongoing to enable the continual refinement of models of care. Second, significant funding and intersectoral support are needed to ensure that the laws are not tokenistic and do not remain the responsibility of police. Third, there are opportunities to put policies and principles in place to ensure that police do not use more coercive powers to address concerns around public drunkenness. Most importantly, state-wide education and training efforts are needed alongside the repeal of the law to ensure that emergency services and health-care workers (as well as the community), have a good understanding of the contexts and needs of people who are considered drunk in public, and consequently treat them with care and respect.
Shearfree Cylindrical Gravitational Collapse
Creators: name: di Prisco, A.
name: Herrera, L.
name: MacCallum, M. A. H.
name: Santos, N. O.
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider diagonal cylindrically symmetric metrics, with an interior representing a general non-rotating fluid with anisotropic pressures. An exterior vacuum Einstein-Rosen spacetime is matched to this using Darmois matching conditions. We show that the matching conditions can be explicitly solved for the boundary values of metric components and their derivatives, either for the interior or exterior. Specializing to shearfree interiors, a static exterior can only be matched to a static interior, and the evolution in the non-static case is found to be given in general by an elliptic function of time. For a collapsing shearfree isotropic fluid, only a Robertson-Walker dust interior is possible, and we show that all such cases were included in Cocke's discussion. For these metrics, Nolan and Nolan have shown that the matching breaks down before collapse is complete and Tod and Mena have shown that the spacetime is not asymptotically flat in the sense of Berger et al. The issues about energy that then arise are revisited and it is shown that the exterior is not in an intrinsic gravitational or superenergy radiative state at the boundary.
description: RevTeX. References added, and discussion amended and extended in response to referee reports. Accepted for publication in Phys. Rev. D
[Documentation of work produced within the Master of Fine Arts course]
Creators: name: Miller, Paul S
Publisher: name: University Of Tasmania
Year: 2023

description: Since I wrote my proposal in Canada two years ago, there has been a focussing of my work in certain areas, while other concerns have assumed a lesser significance in the body of the work. I had anticipated this when writing the proposal, aware that I must allow a flexibility to accommodate the changes I thought would accompany my introduction to a new culture. What was to be a maJor concern during the course, and something that my work had been dealing with before I left Canada, was the notion of man as creator and destroyer in a decaying environment. However I found that I could not continue to work as I had in Canada, as it seemed my new environment called for a reassessment of my working process, and only after such a reassessment have I been able to return to this theme. What I have been dealing with significantly in my work is how, as an artist, I have responded to a new environment with its many dimensions. My work has dealt with my adaptation to a familiar yet unfamiliar culture. I felt compelled to communicate my feelings of 'displacement' through the use of symbols that I believe have a universal significance. This was developed in work that uses the images of the tower, the head, and the storm tossed boat. The latter two in particular acted as vehicles for expressing the experience of the journey, whether it be the journey of an individual to anew land, or the universal journey through life. I would say that at the time I wrote the proposal I, to a degree, underestimated (although I had anticipated) the impact of a new environment, and the subsequent adaptations to it, on my work. The final series of paintings completed during the course has grown out of the exploration of the notion of the journey, departure and arrival, confrontation with a new culture or the unknown. The final series of drawings was born of my concern with man as destroyer and creator, reformulated, often through the symbol of the flame (fire symbolizes both destruction and the renewal that is made possible through this), and reborn in a new context. The Journey to a new place frequently brings with it the need to destroy much of what has constituted the past -- the things that applied in another place and time but are no longer relevant. In my own experience it has been necessary to destroy much m order to create anew.
Analytic Moment-based Gaussian Process Filtering
Creators: name: Deisenroth, Marc P.
name: Huber, Marco F.
name: Hanebeck, Uwe D.
Publisher: name: Karlsruhe
Year: 2009

description: We propose an analytic moment-based filter for nonlinear stochastic dynamic systems modeled by Gaussian processes. Exact expressions for the expected value and the covariance matrix are provided for both the prediction step and the filter step, where an additional Gaussian assumption is exploited in the latter case. Our filter does not require further approximations. In particular, it avoids finite-sample approximations. We compare the filter to a variety of Gaussian filters, that is, the EKF, the UKF, and the recent GP-UKF proposed by Ko et al. (2007).
Negative and normal self-schemata : content differences and processing influence
Creators: name: Miller, Robyn
Publisher: name: University Of Tasmania
Year: 2023

description: Social cognition suggests that self-schemata (cognitive structures of self-knowledge) guide the processing of personal information and facilitate recognition of self relevant evidence. Likewise, negative self-schemata are thought to bias recognition toward negative personal information in cognitive depression and performance anxiety. Research aims were to specify how negative and normal self-schemata differ, and to examine self-schema processing influence. Self-schemata constitute an active, conceptually-driven process which enhances the discriminability of favoured evidence. Bias can also arise from a passive, stimulusdriven process due to lower recognition thresholds for favoured evidence. A yes/no decision task was used for investigating schemata by determining sensitivity and response latency for personal descriptor content. Experiments 1 to 3 compared negative and normal schematics. Descriptors varied in pleasantness and relevance to personal competence. Self-ratings showed that negative schematics had superior discrimination for competence whereas normal schematics had superior discrimination for pleasantness. Negative self-percept reflected incompetence, not unpleasantness. Normal characterization reflected marked self-enhancement. Role-reversal ratings maintained the sensitivity differences observed for self-ratings. Response latencies consistently indicated effects resulting from stimulus driven processes and not schema-driven influence. Experiments 4 and 5 compared subjects with or without a self-schema for a normal personality dimension. Self-rating discrimination of test descriptors was greater for schematics yet this superiority vanished for vignette-rating which dissociated self-schema influence from discriminative ability. Response latencies largely indicated effects resulting from stimulus-driven processes but a slight residue of schema-driven influence was also obtained for self-judgements. Experiment 6 used a word naming task and presented variously degraded personal and impersonal descriptors. Schema-relevant items were named more rapidly and accurately than impersonal and schema-irrelevant items. Schema-driven processing was the more probable source of the effect. Choice decision latency data were reanalysed to determine how a word relevance bias related to a word frequency bias. A cross-over interaction resulted for self-rating schematic subjects whereby the normal frequency effect reversed for self-irrelevant words. Despite considering various processing models, this outcome defied explanation. Reversal of the frequency effect occurs in recognition memory performance and similar processes were possibly implicated in self-rating. Major findings were firstly that competence information has more salience for negative schematics. Secondly, judgement latencies show little schema-driven influence. Finally, a self-relevance bias probably results from schema-driven processing in which case, processing of relevant evidence is highly accurate.
The Unfair Burdens Argument Against Carbon Pricing
Creators: name: Tank, Lukas
Publisher: name: Humboldt-Universität zu Berlin
Year: 2020
Subjects: subject: 100 Philosophie und Psychologie

description: Carbon pricing is one of the most politically important approaches for the mitigation of climate change in the world today. Most political actors who are not committed to climate change denial favor carbon pricing, either as emissions trading or carbon taxation. In this article, I argue that carbon pricing should be considered unfair in most of its forms. I present a line of criticism called the Unfair Burdens Argument . It states that the most politically relevant ways to price carbon needlessly burden the less affluent more than the more affluent. This is unfair because, among other things, the more affluent have on average done more to create the problem of climate change in the first place. Principles for the fair distribution of burdens under climate change mitigation like the Polluter Pays Principle, which were thought to support carbon pricing, turn out to speak against it, when interpreted properly. Although the Unfair Burdens Argument on its own cannot show that carbon pricing is impermissible, it offers important clues for what a morally permissible form of climate change mitigation would look like.
A Framework for Evaluating the VISSIM Traffic Simulation with Extended Range Telepresence
Creators: name: Pèrez Arias, Antonia
name: Kretz, Tobias
name: Ehrhardt, Peter
name: Hengst, Stefan
name: Vortisch, Peter
name: Hanebeck, Uwe D.
Publisher: name: Karlsruhe
Year: 2009

description: This paper presents a novel framework for combining traffic simulations and extended range telepresence. The real user's position data can thus be used for validation and calibration of models of pedestrian dynamics, while the user experiences a high degree of immersion by interacting with agents in realistic simulations.
Liquid-Crystal Transitions: A First Principles Multiscale Approach
Creators: name: Shreif, Zeina
name: Pankavich, Stephen
name: Ortoleva, Peter
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A rigorous theory of liquid-crystal transitions is developed starting from the Liouville equation. The starting point is an all-atom description and a set of order parameter field variables that are shown to evolve slowly via Newton's equations. The separation of timescales between that of atomic collisions and the order parameter fields enables the derivation of rigorous equations for stochastic order parameter field dynamics. When the fields provide a measure of the spatial profile of the probability of molecular position, orientation, and internal structure, a theory of liquid-crystal transitions emerges. The theory uses the all-atom/continuum approach developed earlier to obtain a functional generalization of the Smoluchowski equation wherein key atomic details are embedded. The equivalent non-local Langevin equations are derived and computational aspects are discussed. The theory enables simulations that are much less computationally intensive than molecular dynamics and thus does not require oversimplification of the system's constituent components. The equations obtained do not include factors that require calibration and can thus be applicable to various phase transitions which overcomes the limitations of phenomenological field models. The relation of the theory to phenomenological descriptions of Nematic and Smectic phase transitions, and the possible existence of other types of transitions involving intermolecular structural parameters are discussed.
description: 23 pages, 2 figures; submitted to Phys. Rev. E
Instantaneous Pose Estimation using Rotation Vectors
Creators: name: Beutler, Frederik
name: Huber, Marco F.
name: Hanebeck, Uwe D.
Publisher: name: Karlsruhe
Year: 2009

description: An algorithm for estimating the pose, i.e., translation and rotation, of an extended target object is introduced. Compared to conventional methods, where pose estimation is performed on the basis of timeof- flight (TOF) measurements between external sources and sensors attached to the object, the proposed approach directly uses the amplitude values measured at the sensors for estimation purposes without an intermediate TOF estimation step. This is achieved by modeling the wave propagation by a nonlinear dynamic system comprising a system and a measurement equation. The nonlinear system equation includes a model of the time-variant structure of the object rotation based on rotation vectors. As a result, the measured amplitude values at the sensors can be processed instantaneously in a recursive fashion. Uncertainties in the measurement process are systematically considered by employing a stochastic filter for estimating the pose, i.e., the state of the nonlinear dynamic system.
Ultra-broadband photon pair preparation by spontaneous four wave mixing in dispersion-engineered optical fiber
Creators: name: Garay-Palmett, Karina
name: U'Ren, Alfred B.
name: Rangel-Rojo, Raúl
name: Evans, Rodger
name: Camacho-López, Santiago
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a study of the spectral properties of photon pairs generated through the process of spontaneous four wave mixing (SFWM) in single mode fiber. Our analysis assumes narrowband pumps, which are allowed to be frequency-degenerate or non-degenerate. Based on this analysis, we derive conditions on the pump frequencies and on the fiber dispersion parameters which guarantee the generation of ultra-broadband photon pairs. Such photon pairs are characterized by: i) a very large degree of entanglement, and ii) a very high degree of temporal synchronization between the signal and idler photons. Through a numerical exercise, we find that the use of photonic crystal fiber (PCF) facilitates the fulfilment of the conditions for ultra-broadband photon pair generation; in particular, the spectral region in which emission occurs can be adjusted to particular needs through an appropriate choice of the PCF parameters. In addition, we present a novel quantum interference effect, resulting from indistinguishable pathways to the same outcome, which can occur when pumping a SFWM source with multiple spectral lines.
description: 15 pages, 10 figures. To be published in Phys. Rev. A
Evaporation induced flow inside circular wells
Creators: name: Tarasevich, Yu. Yu.
name: Vodolazskaya, I. V.
name: Isakova, O. P.
name: Latif, M. S. Abdel
Publisher: name: arXiv
Year: 2009
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Flow field and height averaged radial velocity inside a droplet evaporating in an open circular well were calculated for different modes of liquid evaporation.
description: 5 page, 3 figures, submitted to European Physical Journal E
title: Рентгеноморфологические динамические изменения легочной ткани при COVID-19
title: X-Ray Morphological and Dynamic Changes of Lung Tissue in COVID-19
Creators: name: Гаус, Анна Алексеевна
name: Климова, Наталья Валерьевна
name: Гаус, Иван Алексеевич
Publisher: name: Издательский центр СурГУ
Year: 2021

description: Цель – изучение особенностей рентгеноморфологической картины воспалительных изменений в легких
у больных с COVID-19 по данным мультиспиральной компьютерной томографии для оценки эффективности
лечения. Материал и методы. Проанализированы данные мультиспиральной компьютерной томографии грудной полости 990 больных с COVID-19, проходивших лечение в многопрофильной клинической больнице г. Сургута в период с марта по июль 2020 г. Лучевая диагностика проводилась для выявления патогномоничных рентгеноморфологических признаков COVID-19, степени поражения, а также для оценки динамики воспалительных изменений легочной ткани. Результаты. В ходе исследования выявлено различное течение воспалительных изменений в легких в динамике после пиковой стадии консолидации: развитие резидуального «матового стекла», фиброзирование разной степени выраженности, а также затяжное течение консолидации легочной ткани.
description: The study aims to study the features of the X-ray morphological picture of inflammatory changes in the
lungs in COVID-19 patients according to multispiral computed tomography, and to assess the effectiveness of
treatment. Material and methods. The study is carried out according to the data of dynamic examination of X-ray
computed tomography of the thoracic cavity of 990 patients with COVID-19 who were treated at a multidisciplinary
clinical hospital in Surgut from March to July 2020. Radiation diagnosis of the disease consisted in identifying
pathognomonic X-ray morphological signs of COVID-19, the degree of damage, as well as assessing the dynamics
of inflammatory changes in the lung tissue. Results. The study revealed a different course of inflammatory changes
in the lungs in dynamics after the peak stage of consolidation: the development of recurrent “ground glass”, varying
degrees of severity of fibrosis, as well as a lingering course of the consolidation of lung tissue.
Optimal Multi-Modes Switching Problem in Infinite Horizon
Creators: name: Asri, Brahim El
Publisher: name: arXiv
Year: 2009
Subjects: subject: Probability (math.PR)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 60G40, 62P20, 91B99, 91B28, 35B37, 49L25

description: This paper studies the problem of the deterministic version of the Verification Theorem for the optimal m-states switching in infinite horizon under Markovian framework with arbitrary switching cost functions. The problem is formulated as an extended impulse control problem and solved by means of probabilistic tools such as the Snell envelop of processes and reflected backward stochastic differential equations. A viscosity solutions approach is employed to carry out a finne analysis on the associated system of m variational inequalities with inter-connected obstacles. We show that the vector of value functions of the optimal problem is the unique viscosity solution to the system. This problem is in relation with the valuation of firms in a financial market.
Saturation of Two Level Systems and Charge Noise in Josephson Junction Qubits
Creators: name: Constantin, Magdalena
name: Yu, Clare C.
name: Martinis, John M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study the charge noise $S_Q$ in Josephson qubits produced by fluctuating two level systems (TLS) with electric dipole moments in the substrate. The TLS are driven by an alternating electric field of angular frequency $Ω$ and electric field intensity $I$. It is not widely appreciated that TLS in small qubits can easily be strongly saturated if $I\gg I_c$, where $I_c$ is the critical electric field intensity. To investigate the effect of saturation on the charge noise, we express the noise spectral density in terms of density matrix elements. To determine the dependence of the density matrix elements on the ratio $I/I_c$, we find the steady state solution for the density matrix using the Bloch-Redfield differential equations. We then obtain an expression for the spectral density of charge fluctuations as a function of frequency $f$ and the ratio $I/I_c$. We find $1/f$ charge noise at low frequencies, and that the charge noise is white (constant) at high frequencies. Using a flat density of states, we find that TLS saturation has no effect on the charge noise at either high or low frequencies.
description: 13 pages, 9 figures, accepted for publication in Phys. Rev. B
MPEC 2023-Y32 : 2023 YE
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 YE

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Isothermal-isobaric molecular dynamics using stochastic velocity rescaling
Creators: name: Bussi, Giovanni
name: Zykova-Timan, Tatyana
name: Parrinello, Michele
Publisher: name: arXiv
Year: 2009
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The authors present a new molecular dynamics algorithm for sampling the isothermal-isobaric ensemble. In this approach the velocities of all particles and volume degrees of freedom are rescaled by a properly chosen random factor. The technical aspects concerning the derivation of the integration scheme and the conservation laws are discussed in detail. The efficiency of the barostat is examined in Lennard-Jones solid and liquid near the triple point and compared with the deterministic Nosé-Hoover and the stochastic Langevin methods. In particular, the dependence of the sampling efficiency on the choice of the thermostat and barostat relaxation times is systematically analyzed.
description: Accepted for publication on Journal of Chemical Physics
Interdendritic fluid flow
Creators: name: Kaempffer, Fred L.
Publisher: name: University of British Columbia
Year: 2011

description: A qualitative investigation of interdendritic liquid flow was carried out on pre-cast Pb-20Sn ingots at temperatures where the casting was partially liquid. The liquid flow was found to be preferential in nature, and strongly dependent on surface tension effects. Castings of Cu-8Ag and Al-30Ag were made in which the chill was removed during solidification to cause exudation of solute rich liquid. Nacrosegregation was detected using radioactive tracer elements. The castings were characterized by a solute enriched exuded zone and a solute depleted region adjacent to the chill. Models based on the simple back-flow of residual liquid to feed exudation were developed to explain the composition profiles adjacent to the chill.
Resonant effects on the two-photon emission from hydrogenic ions
Creators: name: Amaro, P.
name: Santos, J. P.
name: Parente, F.
name: Surzhykov, A.
name: Indelicato, Paul
Publisher: name: arXiv
Year: 2009
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: A theoretical study the all two-photon transitions from initial bound states with ni = 2, 3 in hydrogenic ions is presented. High-precision values of relativistic decay rates for ions with nuclear charge in the range 1 =< Z =< 92 are obtained through the use of finite basis sets for the Dirac equation constructed from B-splines. We also report the spectral (energy) distributions of several resonant transitions, which exhibit interesting structures, such as zeroes in the emission spectrum, indicating that two-photon emission is strongly suppressed at certain frequencies. We compare two different approaches (the Line Profile Approach (LPA) and the QED approach based on the analysis of the relativistic two-loop self energy (TLA)) to regularize the resonant contribution to the decay rate. Predictions for the pure two-photon contributions obtained in these approaches are found to be in a good numerical agreement.
Multi-User Diversity vs. Accurate Channel State Information in MIMO Downlink Channels
Creators: name: Ravindran, Niranjay
name: Jindal, Nihar
Publisher: name: arXiv
Year: 2009
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In a multiple transmit antenna, single antenna per receiver downlink channel with limited channel state feedback, we consider the following question: given a constraint on the total system-wide feedback load, is it preferable to get low-rate/coarse channel feedback from a large number of receivers or high-rate/high-quality feedback from a smaller number of receivers? Acquiring feedback from many receivers allows multi-user diversity to be exploited, while high-rate feedback allows for very precise selection of beamforming directions. We show that there is a strong preference for obtaining high-quality feedback, and that obtaining near-perfect channel information from as many receivers as possible provides a significantly larger sum rate than collecting a few feedback bits from a large number of users.
description: Submitted to IEEE Transactions on Communications, July 2009
Multidimensional responses of grassland stability to eutrophication
Creators: name: Chen, Q
name: Wang, S
name: Borer, ET
name: Bakker, JD
name: Seabloom, EW
name: Harpole, WS
name: Eisenhauer, N
name: Lekberg, Y
name: Buckley, YM
name: Catford, JA
name: Roscher, C
name: Donohue, I
name: Power, SA
name: Daleo, P
name: Ebeling, A
name: Knops, JMH
name: Martina, JP
name: Eskelinen, A
name: Morgan, John
name: Risch, AC
name: Caldeira, MC
name: Bugalho, MN
name: Virtanen, R
name: Barrio, IC
name: Niu, Y
name: Jentsch, A
name: Stevens, CJ
name: Gruner, DS
name: MacDougall, AS
name: Alberti, J
name: Hautier, Y
Publisher: name: La Trobe
Year: 2023
Subjects: classificationCode: 300407
subject: Crop and pasture nutrition

description: Eutrophication usually impacts grassland biodiversity, community composition, and biomass production, but its impact on the stability of these community aspects is unclear. One challenge is that stability has many facets that can be tightly correlated (low dimensionality) or highly disparate (high dimensionality). Using standardized experiments in 55 grassland sites from a globally distributed experiment (NutNet), we quantify the effects of nutrient addition on five facets of stability (temporal invariability, resistance during dry and wet growing seasons, recovery after dry and wet growing seasons), measured on three community aspects (aboveground biomass, community composition, and species richness). Nutrient addition reduces the temporal invariability and resistance of species richness and community composition during dry and wet growing seasons, but does not affect those of biomass. Different stability measures are largely uncorrelated under both ambient and eutrophic conditions, indicating consistently high dimensionality. Harnessing the dimensionality of ecological stability provides insights for predicting grassland responses to global environmental change.
Effects of azimuth-symmetric acceptance cutoffs on the measured asymmetry in unpolarized Drell-Yan fixed target experiments
Creators: name: Bianconi, A.
name: Bussa, M. P.
name: Destefanis, M.
name: Ferrero, L.
name: Greco, M.
name: Maggiora, M.
name: Spataro, S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Fixed-target unpolarized Drell-Yan experiments often feature an acceptance depending on the polar angle of the lepton tracks in the laboratory frame. Typically leptons are detected in a defined angular range, with a dead zone in the forward region. If the cutoffs imposed by the angular acceptance are independent of the azimuth, at first sight they do not appear dangerous for a measurement of the cos(2ϕ)-asymmetry, relevant because of its association with the violation of the Lam-Tung rule and with the Boer-Mulders function. On the contrary, direct simulations show that up to 10 percent asymmetries are produced by these cutoffs. These artificial asymmetries present qualitative features that allow them to mimic the physical ones. They introduce some model-dependence in the measurements of the cos(2ϕ)-asymmetry, since a precise reconstruction of the acceptance in the Collins-Soper frame requires a Monte Carlo simulation, that in turn requires some detailed physical input to generate event distributions. Although experiments in the eighties seem to have been aware of this problem, the possibility of using the Boer-Mulders function as an input parameter in the extraction of Transversity has much increased the requirements of precision on this measurement. Our simulations show that the safest approach to these measurements is a strong cutoff on the Collins-Soper polar angle. This reduces statistics, but does not necessarily decrease the precision in a measurement of the Boer-Mulders function.
description: 13 pages, 14 figures
Estimating stem profile using canopy metrics : a forest inventory application for airborne remote sensing
Creators: name: Musk, Robert
Publisher: name: University Of Tasmania
Year: 2023

description: The precision of plot based inventories is limited by the spatial variability of forest metrics. This thesis develops an inventory method for the assessment of radiata pine (Pinus radiata D. Don) plantations that exhibit high spatial variability. The method utilises forest canopy metrics that may be acquired using airborne remote sensing technologies in the estimation of individual tree stem profile properties. A review of the growth behaviour of radiata pine isolates the period prior to significant silvicultural interventions as the optimum sampling age. A review of recent developments in remote sensing technologies isolates tree location and height as the best potential sampling covariates. Tree height, location and stem profile data in two age cohorts are drawn from a single radiata pine estate in southeastern Tasmania, Australia. Local density indices are derived using tree height and location data and their utility for predicting breast height diameter is evaluated. Segmented and variable-form stem profile models employing individual tree height and local density are then derived using mixed and generalized leastsquares modelling methodologies in order to facilitate estimation of merchantable timber volume. It is shown that neighbour tree location, distance and height with respect to a subject tree, are all significant breast height diameter predictors. Their influence is attributed to the asymmetric and one-sided nature of the interactions between trees during stand development. The stem profile models are shown to provide merchantable volume estimates with acceptable bias, with simple segmented models preferred for their parsimony. Mixed modelling methods are shown to best describe the variance-covariance structure of the stem profile data, with some attendant advantages in model predictive behaviour. The evaluation shows that remote sensing products may be used for plantation inventory in many radiata pine stands.