cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A computer simulation study of the application of contextual constraints to character recognition
Creators: name: Dykema, Cornelius A.
Publisher: name: University of British Columbia
Year: 2011

description: Improvement of specific character recognition systems through the use of contextual constraints has been demonstrated by several researchers in the field. In this thesis, the effectiveness of using contextual constraints to improve the overall performance of a generalized character recognition system is studied experimentally. A computer simulation system designed to facilitate this investigation for both theoretical and physical character recognition system models is described. A suitable character recognition system model is developed. A number of sequential decision algorithms based on Bayes' optimum decision rule and using different order contextual constraints are implemented as the decision element of the character recognition process. The effect on the performance of the contextual decision algorithms of varying the source data, as well as varying the quality and characterization of the feature extraction system with classifier have been demonstrated. The experimental results for the practical character recognition system model confirmed the findings of others that significant improvement in overall system performance can be achieved through the application of contextual constraints. It was shown that the improvement was directly proportional to the order of contextual information used for low order statistics and that the improvement was most pronounced when these statistics were representative of the source material, the feature extraction system with classifier had a high recognition accuracy initially and its performance was characterized by mistaking the most frequently occurring characters more often than the infrequently occurring characters. It was demonstrated that (1) computer simulation is a useful tool in testing hypotheses concerning the application of contextual constraints to character recognition, (2) qualitative predictions based on theoretical character recognition system models are applicable to practical character recognition systems, and (3) the improvement which can be obtained with the application of contextual constraints to character recognition is sufficient to make machine editing of text competitive with clerical editing.
Non-existence of Ramanujan congruences in modular forms of level four
Creators: name: Dewar, Michael
Publisher: name: arXiv
Year: 2009
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11F33; 11P83

description: Ramanujan famously found congruences for the partition function like p(5n+4) = 0 modulo 5. We provide a method to find all simple congruences of this type in the coefficients of the inverse of a modular form on Gamma_{1}(4) which is non-vanishing on the upper half plane. This is applied to answer open questions about the (non)-existence of congruences in the generating functions for overpartitions, crank differences, and 2-colored F-partitions.
description: 19 pages
The arctic curve of the domain-wall six-vertex model
Creators: name: Colomo, F.
name: Pronko, A. G.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Combinatorics (math.CO)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The problem of the form of the `arctic' curve of the six-vertex model with domain wall boundary conditions in its disordered regime is addressed. It is well-known that in the scaling limit the model exhibits phase-separation, with regions of order and disorder sharply separated by a smooth curve, called the arctic curve. To find this curve, we study a multiple integral representation for the emptiness formation probability, a correlation function devised to detect spatial transition from order to disorder. We conjecture that the arctic curve, for arbitrary choice of the vertex weights, can be characterized by the condition of condensation of almost all roots of the corresponding saddle-point equations at the same, known, value. In explicit calculations we restrict to the disordered regime for which we have been able to compute the scaling limit of certain generating function entering the saddle-point equations. The arctic curve is obtained in parametric form and appears to be a non-algebraic curve in general; it turns into an algebraic one in the so-called root-of-unity cases. The arctic curve is also discussed in application to the limit shape of $q$-enumerated (with $0
description: 39 pages, 2 figures; minor corrections
Meso-Nh simulations of the atmospheric flow above the Internal Antarctic Plateau
Creators: name: Lascaux, Franck
name: Masciadri, Elena
name: Hagelin, Susanna
name: Stoesz, Jeffrey A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: Mesoscale model such as Meso-Nh have proven to be highly reliable in reproducing 3D maps of optical turbulence (see Refs. 1, 2, 3, 4) above mid-latitude astronomical sites. These last years ground-based astronomy has been looking towards Antarctica. Especially its summits and the Internal Continental Plateau where the optical turbulence appears to be confined in a shallow layer close to the icy surface. Preliminary measurements have so far indicated pretty good value for the seeing above 30-35 m: 0.36" (see Ref. 5) and 0.27" (see Refs. 6, 7) at Dome C. Site testing campaigns are however extremely expensive, instruments provide only local measurements and atmospheric modelling might represent a step ahead towards the search and selection of astronomical sites thanks to the possibility to reconstruct 3D Cn2 maps over a surface of several kilometers. The Antarctic Plateau represents therefore an important benchmark test to evaluate the possibility to discriminate sites on the same plateau. Our group8 has proven that the analyses from the ECMWF global model do not describe with the required accuracy the antarctic boundary and surface layer in the plateau. A better description could be obtained with a mesoscale meteorological model. In this contribution we present the progress status report of numerical simulations (including the optical turbulence - Cn2) obtained with Meso-Nh above the internal Antarctic Plateau. Among the topic attacked: the influence of different configurations of the model (low and high horizontal resolution), use of the grid-nesting interactive technique, forecasting of the optical turbulence during some winter nights.
description: 12 pages, 4 figures, SPIE 2008 conference
Stephen Mansfield, Killing Jesus. The Unknown Conspiracy Behind the World’s Most Famous Execution, Worthy Publishing. New York 2013, ss. 255.
Creators: name: Dziuba, Andrzej Franciszek
Publisher: name: Wrocławski Przegląd Teologiczny
Year: 2019

description: Wrocławski Przegląd Teologiczny, Vol 22 No 2 (2014)
Multipartite Entanglement Criterion from Uncertainty Relations
Creators: name: Gillet, J.
name: Bastin, T.
name: Agarwal, G. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We formulate an entanglement criterion using Peres-Horodecki positive partial transpose operations combined with the Schrödinger-Robertson uncertainty relation. We show that any pure entangled bipartite and tripartite state can be detected by experimentally measuring mean values and variances of specific observables. Those observables must satisfy a specific condition in order to be used, and we show their general form in the $2\times 2$ (two qubits) dimension case. The criterion is applied on a variety of physical systems including bipartite and multipartite mixed states and reveals itself to be stronger than the Bell inequalities and other criteria. The criterion also work on continuous variable cat states and angular momentum states of the radiation field.
description: 5 pages
The Expansion of Exemption: Texas’ Districts of Innovation
Creators: name: Guthery, Sarah
name: Richard, Meredith P.
Publisher: name: Texas Education Review
Year: 2020
Subjects: District of Innovation
deregulation
school choice
market-based education

description: In 2015, Texas precipitated a quiet but dramatic shift in public education by allowing school districts to convert to “Districts of Innovation”(DOI) and thereby claim exemptions to many aspects of the education code previously limited to charter schools, such as teacher licensure requirements, class sizes, and school calendars. Facilitated by a streamlined conversion process, more than 740 of Texas’ 1,025 traditional public districts have become DOIs. Echoing the arguments underpinning other market-based reforms, proponents argue that exempting school districts from onerous bureaucratic requirements will allow local authorities to provide education more efficiently. Despite the sweeping implications of the DOI policy, they have received little public and scholarly scrutiny. We review the history and available evidence on the DOI policy, arguing that it presents cause for concern – particularly as it relates to removing legal safeguards designed to protect students and reversing policies demonstrated to be positively linked with student outcomes (e.g., class size).
Einﬂuss dynamischer Kontexterweiterungen auf die Schlussfolgerungsfähigkeiten neuronaler Sprachmodelle
Creators: name: Schmitt, Sina
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2021

description: Die meta-kognitive Strategie „laut nachzudenken“ kann auf neuronale Sprachmodelle übertragen werden, wie Betz et al. zeigen: Ein vortrainiertes Sprachmodell ist besser in der Lage, deduktive Schlussfolgerungsprobleme zu lösen, wenn es zuvor dynamische Problemelaborationen generiert. Das Sprachmodell verwendet auf dem Datensatz von Betz et al. eine einfache Heuristik für seine Antwortvorhersage, die es mithilfe der selbst generierten Kontexterweiterungen effektiver einsetzen kann. In dieser Arbeit untersuche ich, wie dynamische Kontexterweiterungen die Performanz eines neuronalen Sprachmodells beeinflussen, wenn es nicht auf eine solche Heuristik zurückgreifen kann. Ich überprüfe (i) die Schlussfolgerungsfähigkeiten eines vortrainierten neuronalen Sprachmodells im Zero-Shot-Setting, (ii) den Einfluss verschiedener vorgegebener Kontexterweiterungen auf die Zero-Shot-Performanz und (iii) die Fähigkeiten des Sprachmodells, selbst effektive Kontexterweiterungen zu generieren und zu nutzen. Dazu erstelle ich einen synthetischen Datensatz mit deduktiven Schlussfolgerungsaufgaben unterschiedlicher Komplexität. Das verwendete Sprachmodell zeigt im Zero-Shot-Setting leichte bis moderate Schlussfolgerungsfähigkeiten. Anhand eines zweiten Datensatzes zeige ich, dass das Sprachmodell sogar eingeschränkt in der Lage ist, Schlussfolgerungen über erfundene Prädikate zu ziehen. Wie verschiedene Komponenten der Schlussfolgerungsaufgaben die Performanz des Sprachmodells beeinflussen, untersuche ich mithilfe synthetischer Kontexterweiterungen. Ich zeige unter Anderem, dass Aufgaben, deren Inhalte stärker verknüpft sind, dem Modell größere Schwierigkeiten bereiten. Außerdem demonstriere ich, dass Kontexterweiterungen ein wirkungsvolles Mittel sein können, um die Zero-Shot-Performanz von Sprachmodellen zu verbessern. Besonders hilfreich sind synthetische Kontexterweiterungen, die das Prinzip deduktiver Ableitungen veranschaulichen. Dynamische Kontexterweiterungen, die das Sprachmodell auf Grundlage der Problembeschreibung selbst erzeugt, beeinflussen die Vorhersage hingegen kaum. Few-Shot-Learning mit zwei Beispielen kann die Qualität der generierten Elaborationen leicht erhöhen.
A Noncommutative Gauss map
Creators: name: Eckhardt, Caleb
Publisher: name: arXiv
Year: 2009
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 47L99

description: The aim of this paper is to transfer the Gauss map, which is a Bernoulli shift for continued fractions, to the noncommutative setting. We feel that a natural place for such a map to act is on the AF algebra $\mathfrak{A}$ considered separately by F. Boca and D. Mundici. The center of $\ga$ is isomorphic to $C[0,1]$, so we first consider the action of the Gauss map on $C[0,1]$ and then extend the map to $\mathfrak{A}$ and show that the extension inherits many desirable properties.
description: 13 pages
Quantum field theory on a cosmological, quantum space-time
Creators: name: Ashtekar, Abhay
name: Kaminski, Wojciech
name: Lewandowski, Jerzy
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In loop quantum cosmology, Friedmann-LeMaitre-Robertson-Walker (FLRW) space-times arise as well-defined approximations to specific \emph{quantum} geometries. We initiate the development of a quantum theory of test scalar fields on these quantum geometries. Emphasis is on the new conceptual ingredients required in the transition from classical space-time backgrounds to quantum space-times. These include a `relational time' a la Leibnitz, the emergence of the Hamiltonian operator of the test field from the quantum constraint equation, and ramifications of the quantum fluctuations of the background geometry on the resulting dynamics. The familiar quantum field theory on classical FLRW models arises as a well-defined reduction of this more fundamental theory.
description: 19 pages, no figures; A reference and footnote added, PACs and minor typos corrected; a significant technical clarification added to section IV.A; minor typos corrected; two references added
An invariant analytic orthonormalization procedure with an application to coherent states
Creators: name: Bagarello, F.
name: Triolo, S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We discuss a general strategy which produces an orthonormal set of vectors, stable under the action of a given set of unitary operators $A_j$, $j=1,2,...,n$, starting from a fixed normalized vector in $\Hil$ and from a set of unitary operators. We discuss several examples of this procedure and, in particular, we show how a set of {\em coherent-like} vectors can be produced and in which condition over the lattice spacing this can be done.
Józef Kardynał Glemp. Prymas Polski, Rozwijać Kościół dzień po dniu. Czynności pasterskie 2001–2007. Redaktor ks. Mirosław Kreczmański, Oficyna Wydawni- czo-Poligraficzna „ADAM”. Warszawa 2011, ss. 511
Creators: name: Dziuba, Andrzej Franciszek
Publisher: name: Wrocławski Przegląd Teologiczny
Year: 2019

description: Wrocławski Przegląd Teologiczny, Vol 22 No 2 (2014)
Komposition von Trace Link Recovery Ansätzen
Creators: name: Winter, Ian
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2021

description: Das Erstellen von Trace-Links, die beispielsweise Dokumentationen mit Entwurfsmodellen verknüpfen, ist ein wertvoller Bestandteil der Softwareentwicklung. Da ein manuelles Herauslesen der Trace-Links oft nicht praktikabel ist, sollte dieser Prozess automatisiert werden. Es existieren schon viele verschiedene Ansätze der Trace-Link-Recovery, welche jedoch unterschiedliche Stärken und Schwächen aufweisen. In dieser Arbeit wird untersucht, ob die Stärken unterschiedlicher Recovery-Ansätze durch Komposition verknüpft werden können, um ggf. die Schwächen auszugleichen. Dazu habe ich mehrere einfache Kompositionen implementiert und deren Ergebnisse ausgewertet. Die Metriken Ausbeute, Präzision, F1- und F2-Werte verschiedener Kompositionen wurden in drei Fallstudien ermittelt und mit denen der Basis-Ansätze verglichen. Einige Kompositionen schneiden dabei bis zu 12% besser ab als der Durchschnitt der Basis-Ansätze dieser Kompositionen und bis zu 2% besser als der beste Einzelansatz.
An Evidential Path Logic for Multi-Relational Networks
Creators: name: Rodriguez, Marko A.
name: Geldart, Joe
Publisher: name: arXiv
Year: 2008
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Symbolic Computation (cs.SC)
subject: FOS: Computer and information sciences
subject: I.2.4

description: Multi-relational networks are used extensively to structure knowledge. Perhaps the most popular instance, due to the widespread adoption of the Semantic Web, is the Resource Description Framework (RDF). One of the primary purposes of a knowledge network is to reason; that is, to alter the topology of the network according to an algorithm that uses the existing topological structure as its input. There exist many such reasoning algorithms. With respect to the Semantic Web, the bivalent, monotonic reasoners of the RDF Schema (RDFS) and the Web Ontology Language (OWL) are the most prevalent. However, nothing prevents other forms of reasoning from existing in the Semantic Web. This article presents a non-bivalent, non-monotonic, evidential logic and reasoner that is an algebraic ring over a multi-relational network equipped with two binary operations that can be composed to execute various forms of inference. Given its multi-relational grounding, it is possible to use the presented evidential framework as another method for structuring knowledge and reasoning in the Semantic Web. The benefits of this framework are that it works with arbitrary, partial, and contradictory knowledge while, at the same time, it supports a tractable approximate reasoning process.
Spectroscopic binaries among Hipparcos M giants I. Data, orbits, and intrinsic variations
Creators: name: Famaey, B.
name: Pourbaix, D.
name: Frankowski, A.
name: Van Eck, S.
name: Mayor, M.
name: Udry, S.
name: Jorissen, A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: This paper is a follow-up of the vast effort to collect radial velocity data for stars belonging to the Hipparcos survey. We aim at extending the orbital data available for binaries with M giant primaries. The data will be used in the companion papers of this series to (i) derive the binary frequency among M giants and compare it to that of K giants (Paper II), and (ii) analyse the eccentricity-period diagram and the mass-function distribution (Paper III). Keplerian solutions are fitted to radial-velocity data. However, for several stars, no satisfactory solution could be found, despite the fact that the radial-velocity standard deviation is larger than the instrumental error, because M giants suffer from intrinsic radial-velocity variations due to pulsations. We show that these intrinsic radial-velocity variations can be linked with both the average spectral-line width and the photometric variability. We present an extensive collection of spectroscopic orbits for M giants, with 12 new orbits, plus 17 from the literature. Moreover, to illustrate the fact that the large radial-velocity jitter present in Mira and semi-regular variables may easily be confused with orbital variations, we also present examples of pseudo-orbital variations (in S UMa, X Cnc and possibly in HD 115521, a former IAU radial-velocity standard). Because of this difficulty, M giants involving Mira variables were excluded from our monitored sample. We finally show that the majority of M giants detected as X-ray sources are actually binaries.
description: 17 pages, 15 figures, accepted for publication in A&A, language editing changes only
Completely positive invariant conjugate-bilinear maps in partial *-algebras
Creators: name: Bagarello, F.
name: Inoue, A.
name: Trapani, C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The notion of completely positive invariant conjugate-bilinear map in a partial *-algebra is introduced and a generalized Stinespring theorem is proven. Applications to the existence of integrable extensions of *-representations of commutative, locally convex quasi*-algebras are also discussed.
Laboratorio AI XR
Creators: name: Lo Bosco, Giosuè
Publisher: name: INFN Open Access Repository
Year: 2021
Subjects: 3DLab-Sicilia
S. Bernardo

description: Presentazione fatta durante l'incontro del progetto 3DLab-Sicilia con gli Amministratori di alcuni dei Comuni attraversati dal cammino di S. Bernardo. L'agenda dell'incontro è disponibile in questa pagina.
Numerical simulations of the kappa-mechanism with convection
Creators: name: Gastine, T.
name: Dintrans, B.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A strong coupling between convection and pulsations is known to play a major role in the disappearance of unstable modes close to the red edge of the classical Cepheid instability strip. As mean-field models of time-dependent convection rely on weakly-constrained parameters, we tackle this problem by the means of 2-D Direct Numerical Simulations (DNS) of kappa-mechanism with convection. Using a linear stability analysis, we first determine the physical conditions favourable to the kappa-mechanism to occur inside a purely-radiative layer. Both the instability strips and the nonlinear saturation of unstable modes are then confirmed by the corresponding DNS. We next present the new simulations with convection, where a convective zone and the driving region overlap. The coupling between the convective motions and acoustic modes is then addressed by using projections onto an acoustic subspace.
description: 5 pages, 6 figures, accepted for publication in Astrophysics and Space Science, HELAS workshop (Rome june 2009)
Input output analysis and the first Malaysia plan 1966-1970
Creators: name: Bent, Colin G.
Publisher: name: University of British Columbia
Year: 2011

description: This paper is divided into four distinct sections. 1. An explanation of the meaning of input/output analysis, especially the derivation and significance of the table of direct and indirect requirements. 2. An outline of the decisions taken in constructing the West Malaysian 1960 transactions table from a set of National Accounts - especially the treatment and valuation of imports and exports; producer versus purchaser price valuation of transactions; and problems of inconsistent and incomplete double entry records. 3. An explanation of the method of forecasting from input/ output tables. This includes discussion of: a. A method of estimating aggregate demand for Malaya for 1970. b. A method of projection of value added for each sector, 1970. c. The likely stability of the input coefficients over time. 4. Results; a. Differences between the 1960 and 1965 table projections due to changes in Leontief inverses and value added coefficients over time, as the economy undergoes change. b. Comparison of the table projections with the First Malaysia Plan projections: i. Are the Plan projections likely to be reached in 1970? ii. Why are some of the table projections so inaccurate? The paper concludes that 1. The projections from the 1965 input/ output table are generally superior to those from the 1960 table. 2. Under conditions of structural change, even 5 years is too far ahead to expect input/output analysis to yield accurate projections for most sectors.
D-brane instantons and matrix models
Creators: name: García-Etxebarria, Iñaki
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We point out that in some situations it is possible to use matrix model techniques a la Dijkgraaf-Vafa to perturbatively compute D-brane instanton effects. This provides an explanation in terms of stringy instantons of the results in hep-th/0311181. We check this proposal in some simple scenarios. We point out some interesting consequences of this observation, such as the fact that it gives a perturbative way of computing stringy multi-instanton effects. It also provides a further interpretation of D-brane instantons as residual instantons of higgsed supergroups.
description: 20 pages, 1 figure
An aspect of the social implications of residential area planning : a technique to assess the ideal role of neighbor.
Creators: name: Benjamin, Kenneth Caiton
Publisher: name: University of British Columbia
Year: 2011

description: In practice, the neighborhood unit concept has fallen short of its theoretical promise. However, one of its major goals -- attempting to produce a more satisfying social life for the inhabitants of a residential area -- is still valid. To attain such a goal, it now appears to be more valid to attempt to assess the attitudes of people towards each other rather than to attempt to manipulate locations of facilities in order to attempt to develop more satisfying residential environments. One relationship that appears to have relevance for attaining such a goal is that of the neighbor. If it were possible to assess an individual's attitudes towards his neighbors, it would be possible to use such information as one input in the design of future residential developments. By attempting to assess an individual's concept of the ideal role of neighbor, planning would be taken one step away from corrective action based upon behavior observable in an existing environment, towards assessment of attitudes towards residential environments that may provide a more sound basis upon which to predicate changes to produce more satisfying residential environments. T his thesis attempts only to develop a tool by which it may be possible to elicit an individual's concept of the ideal role of neighbor. The construction of the tool follows directly from the theory of what a neighbor is and how a neighbor acts. Testing of the tool is limited to attempting to discover problems of administration .
From gauge-string duality to strong interactions: a Pedestrian's Guide
Creators: name: Gubser, Steven S.
name: Karch, Andreas
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We survey recent progress in understanding the relation of string theory to quantum chromodynamics, focusing on holographic models of gauge theories similar to QCD and applications to heavy-ion collisions.
description: 39 pages; invited review to appear in Annu. Rev. Nuc. Part. Sci; v2: reference added
Accommodation options for released prisoners with complex needs
Creators: name: De Winter, C
Publisher: name: University Of Tasmania
Year: 2023

description: The issue of homelessness or inappropriate housing of people with complex needs is a serious problem for individuals who have found themselves frequently in the criminal justice system. Complex needs and challenging behaviours exhibited by those with mental illness, intellectual disability and or acquired brain injury combined with for example, family dysfunction, homelessness, poverty, and drug and alcohol misuse of a cocktail of issues that have been difficult to treat let alone support. Incarceration has been the alternative for the judiciary with the intention of protecting the individual offender as well as the community. However it is argued that proper support in the community may avert the need to seek incarceration as the only option for 'released prisoners' with complex needs. This thesis seeks to contribute to the understanding of what it means to be a person with complex needs and the effect of a short term sentence on the ability to seek stable accommodation once released from prison. It draws on the extensive literature in the field for example, with regard to people with disabilities in the criminal justice system and the housing experiences of ex-prisoners in general and those with complex needs. Through a number of in depth discussions with stakeholders from both state government and non-government representative agencies, a critical analysis was undertaken of the available accommodation options for this cohort in Tasmania. From these discussions it is evident that, current services either must embrace the needs of this cohort or a new dedicated service should be developed. However, the new Whole of Government and Community Sector housing initiative 'Housing Connect', commencing 1 July 2013, may offer the required support for this group of people with complex needs.
On the speed of fluctuations around thermodynamic equilibrium
Creators: name: Linden, Noah
name: Popescu, Sandu
name: Short, Anthony J
name: Winter, Andreas
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the speed of fluctuation of a quantum system around its thermodynamic equilibrium state, and show that the speed will be extremely small for almost all times in typical thermodynamic cases. The setting considered here is that of a quantum system couples to a bath, both jointly described as a closed system. This setting, is the same as the one considered in [N. Linden et al., Phys. Rev. E 79:061103 (2009)] and the ``thermodynamic equilibrium state'' refers to a situation that includes the usual thermodynamic equilibrium case, as well as far more general situations.
The outcome of protoplanetary dust growth: pebbles, boulders, or planetesimals? II. Introducing the bouncing barrier
Creators: name: Zsom, A.
name: Ormel, C. W.
name: Guettler, C.
name: Blum, J.
name: Dullemond, C. P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The sticking of micron sized dust particles due to surface forces in circumstellar disks is the first stage in the production of asteroids and planets. The key ingredients that drive this process are the relative velocity between the dust particles in this environment and the complex physics of dust aggregate collisions. Here we present the results of a collision model, which is based on laboratory experiments of these aggregates. We investigate the maximum aggregate size and mass that can be reached by coagulation in protoplanetary disks. We model the growth of dust aggregates at 1 AU at the midplane at three different gas densities. We find that the evolution of the dust does not follow the previously assumed growth-fragmentation cycles. Catastrophic fragmentation hardly occurs in the three disk models. Furthermore we see long lived, quasi-steady states in the distribution function of the aggregates due to bouncing. We explore how the mass and the porosity change upon varying the turbulence parameter and by varying the critical mass ratio of dust particles. Particles reach Stokes numbers of roughly 10^-4 during the simulations. The particle growth is stopped by bouncing rather than fragmentation in these models. The final Stokes number of the aggregates is rather insensitive to the variations of the gas density and the strength of turbulence. The maximum mass of the particles is limited to approximately 1 gram (chondrule-sized particles). Planetesimal formation can proceed via the turbulent concentration of these aerodynamically size-sorted chondrule-sized particles.
description: accepted for publication in A&A
Mean electromotive force proportional to mean flow in mhd turbulence
Creators: name: Rädler, K. -H.
name: Brandenburg, A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In mean-field magnetohydrodynamics the mean electromotive force due to velocity and magnetic field fluctuations plays a crucial role. In general it consists of two parts, one independent of and another one proportional to the mean magnetic field. The first part may be nonzero only in the presence of mhd turbulence, maintained, e.g., by small-scale dynamo action. It corresponds to a battery, which lets a mean magnetic field grow from zero to a finite value. The second part, which covers, e.g., the alpha effect, is important for large-scale dynamos. Only a few examples of the aforementioned first part of mean electromotive force have been discussed so far. It is shown that a mean electromotive force proportional to the mean fluid velocity, but independent of the mean magnetic field, may occur in an originally homogeneous isotropic mhd turbulence if there are nonzero correlations of velocity and electric current fluctuations or, what is equivalent, of vorticity and magnetic field fluctuations. This goes beyond the Yoshizawa effect, which consists in the occurrence of mean electromotive forces proportional to the mean vorticity or to the angular velocity defining the Coriolis force in a rotating frame and depends on the cross-helicity defined by the velocity and magnetic field fluctuations. Contributions to the mean electromotive force due to inhomogeneity of the turbulence are also considered. Possible consequences of the above and related findings for the generation of magnetic fields in cosmic bodies are discussed.
description: 7 pages, 1 figure, Astron. Nachr. (submitted)
Sprawozdanie z konferencji naukowej „Kapłani zesłańcy – kapłani wśród zesłańców”
Creators: name: Jerzak, Norbert
Publisher: name: Wrocławski Przegląd Teologiczny
Year: 2019

description: Wrocławski Przegląd Teologiczny, Vol 23 No 1 (2015)
Green Tax Reforms
Creators: name: Roseta-Palma, Catarina
Publisher: name: Zenodo
Year: 2021

description: Most taxes have distortionary impacts, creating deadweight losses in several markets. However,
 taxes are necessary in most economies to support public spending, leaving policy-makers with a
 conundrum. Environmental taxes are an exception to the rule, since their aim is to correct pre-
 existing externalities; thus replacing other taxes with environmental taxes could maintain overall
 tax revenues while improving environmental and economic outcomes, a possibility known as
 the “double dividend”. Catarina Roseta-Palma has developed work on environmental and
 resource costs in several markets, such as water and energy, and in 2014 participated in the
 Portuguese Commission for Green Tax Reform, promoting a wide-ranging review of
 environmental taxes in the country.
Asymptotic estimates of the errors in the numerical integration of analytic functions
Creators: name: Donaldson, John Dalgleish
Publisher: name: University Of Tasmania
Year: 2023

description: An expression in terms of a contour integral for the remainder term in a numerical integration formula of a general type is obtained. Because the function whose integral is under consideration is allowed to have singularities at the end points of the interval of integration special emphasis is placed on the behaviour of the contour at these points. It is then shown how the corresponding contour integral form of the remainder term in some of the well-known integration formulae may be derived. The contour integral in conjunction with known asymptotic expressions for part of the integrand is used firstly to examine the convergence properties of certain quadrature schemes (Chapter III) and secondly to estimate the error in approximating to a real integral by a quadrature sum (Chapter IV). In conclusion (Chapter V) we discuss some of the problems which are to be subjects of further research.
Abraham Joshua Heschel, Prorocy, tłum. A. Gorzkowski, wydawnictwo Esprit, Kraków 2014, ss. 816
Creators: name: Rosik, Mariusz
Publisher: name: Wrocławski Przegląd Teologiczny
Year: 2019

description: Wrocławski Przegląd Teologiczny, Vol 23 No 1 (2015)
Combined free and forced convection through vertical non-circular ducts with and without peripheral wall conduction
Creators: name: Khatry, Abdul Kader
Publisher: name: University of British Columbia
Year: 2011

description: Analysis of combined free and forced convection through vertical non-circular ducts has been carried out using variational technique. Fully developed flow with uniform axial heat input is assumed. All fluid properties are considered invariant with temperature except the variation of density in the buoyancy term of the equation of motion. A general study of the problem has been made in three stages: (i) Forced convection without circumferential wall conduction. For this case, a known velocity expression is used and a particularly simple variational expression has been presented. Nusselt numbers are calculated for rectangular, rhombic, isosceles triangular, and right-angled triangular ducts. Results compared with the available solutions have shown excellent agreement. (ii) Combined free and forced convection without circumferential wall conduction. Nusselt numbers have been computed for rectangular and rhombic ducts. A finite-difference procedure has also been carried out and the results are presented for rhombic duct only. In both of the above cases (i) and (ii), the condition of uniform peripheral heat flux has been directly utilized in deriving the variational expression, thus releasing the thermal boundary condition from satisfying exactly the condition at the wall. The condition of uniform circumferential heat flux results in lower values of Nusselt numbers as compared to that of uniform circumferential wall temperature. This difference in Nusselt number values decreases with the increase in Rayleigh number. At higher values of Rayleigh number, both the conditions tend to produce about the same results. (iii) Conjugate problem of combined free and forced convection when peripheral wall conduction is included. The equations coupling heat conduction in the walls with the convection inside the fluid are solved to establish the influence of peripheral wall conduction. The problem has been solved in a generalized way and the results have been presented for rectangular ducts. It is found that large values of the free convection effects and/or of the conduction parameter tend to minimize the asymmetries in circumferential wall temperature.
A non-Markovian model of rill erosion
Creators: name: Damron, Michael
name: Winter, C. L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: Geophysics (physics.geo-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60K35, 82D99, 60G09

description: We introduce a new model for rill erosion. We start with a network similar to that in the Discrete Web and instantiate a dynamics which makes the process highly non-Markovian. The behavior of nodes in the streams is similar to the behavior of Polya urns with time-dependent input. In this paper we use a combination of rigorous arguments and simulation results to show that the model exhibits many properties of rill erosion; in particular, nodes which are deeper in the network tend to switch less quickly.
description: 26 pages, 9 figures, reference added, acknowledgments added
Geology, geochemistry and gold mineralisation in the Sunset Well area, Eastern Goldfields Province, Western Australia
Creators: name: Grey, K A
Publisher: name: University Of Tasmania
Year: 2023

description: The Sunset Well study area, 10 kilometres east of Leonora in the Archaean Eastern Goldfields Province of Western Australia, forms part of a group of gold exploration tenements held by RGC Exploration Pty Ltd. Geological mapping and a variety of geochemical techniques have outlined alteration within a shear zone and mineralisation at the Prospero prospect. Geological mapping has delineated three lithostratigraphic sequences separated by NNW trending faults. The western succession is comprised of andesite-derived volcaniclastic sediments (sandstone, breccia) with minor fine grained clastic sediment (shale) which are interpreted to represent a stack of subaqueous debris flows derived from a subaqueous andesite-dominated volcanic complex. The central succession is dominated by massive tholeiitic and high-Mg basalts with minor sediments. Fine grained clastic sediments make up the majority of the eastern succession. All sequences have been intruded by dolerite/gabbro sills and the western and central successions are intruded by several granodioritic porphyry stocks. Deep lateritic weathering and subsequent partial erosion has exposed saprolitic subcrops over much of the area with remnants of lateritic duricrust. Surface geochemical anomalism related to the mineralisation within the Prospero shear is outlined in residual lateritic material with a Au-W association (380 ppb Au and 12 ppm W). Sampling of saprolite from surface soil and drilling samples displays a spatial but non-coincident Au-As-W-Pb-Sb-Cu-Zn association. Analysis of K and Na in saprolite and saprock material outlines the sericitic and albitic alteration zones with maximum values centred on the mineralised Prospero shear zone. Mineralisation at Prospero is located within a broad east-dipping shear zone between andesitic volcaniclastics and high-Mg basalt. Supergene saprolitic mineralisation is well developed in broad subhorizontal sheets in the middle saprolite with a smaller accumulation near the saprolite-saprock boundary. Bedrock mineralisation is associated with intense zonal metasomatic alteration comprising an outer chlorite-sericite-quartz-calcite, middle sericite-quartz and inner quartz-albite-sericite-dolomite/ankerite-fuchsite alteration zone. Sulphide mineralogy is dominated by pyrite with minor galena, chalcopyrite, arsenopyrite, sphalerite, chalcocite and covellite. Gold grades are generally 0.2-0.6 ppm in the sericite zone and 0.5-3.0 ppm in the inner silicified zone. Thin quartz veins contain higher grade (5.0-30.0 ppm) mineralisation, with gold occuring as fine (-5 micron) free grains. The primary mineralised zone has a Au-As-W-Cu-Sb-Sr-V-Si-K-Na association. Mineralisation is interpreted to have formed during D1 shear zone formation and synchronous with zonal alteration.
Dynamics of the bacterial flagellar motor with multiple stators
Creators: name: Meacci, G.
name: Tu, Y.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Subcellular Processes (q-bio.SC)
subject: Biological Physics (physics.bio-ph)
subject: Cell Behavior (q-bio.CB)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: The bacterial flagellar motor drives the rotation of flagellar filaments and enables many species of bacteria to swim. Torque is generated by interaction of stator units, anchored to the peptidoglycan cell wall, with the rotor. Recent experiments [Yuan, J. & Berg, H. C. (2008) PNAS 105, 1182-1185] show that near zero load the speed of the motor is independent of the number of stators. Here, we introduce a mathematical model of the motor dynamics that explains this behavior based on a general assumption that the stepping rate of a stator depends on the torque exerted by the stator on the rotor. We find that the motor dynamics can be characterized by two time scales: the moving-time interval for the mechanical rotation of the rotor and the waiting-time interval determined by the chemical transitions of the stators. We show that these two time scales depend differently on the load, and that their crossover provides the microscopic explanation for the existence of two regimes in the torque-speed curves observed experimentally. We also analyze the speed fluctuation for a single motor using our model. We show that the motion is smoothed by having more stator units. However, the mechanism for such fluctuation reduction is different depending on the load. We predict that the speed fluctuation is determined by the number of steps per revolution only at low load and is controlled by external noise for high load. Our model can be generalized to study other molecular motor systems with multiple power-generating units.
description: 18 pages, 6 figures, to be published in PNAS
Optical astronomical spectroscopy with an electronographic image tube
Creators: name: King, David John
Publisher: name: University Of Tasmania
Year: 2023

description: In this thesis is described the testing and installation of a Spectracon image tube at the focus of the Coude spectrograph associated with the University of Tasmania's 16 inch (40 em) reflecting telescope at Canopus Hill Observatory. The tube's performance is described in terms of its limiting resolution and its speed relative to direct photography with Kodak IIa-0 emulsion. On both counts the tube was below expectation. In addition measurements of the linearity of response are presented and a qualitative assessment is made of photo-cathode uniformity. A stellar spectrum taken with the Spectracon is also presented. Ancillary equipment is discussed and a simple film-handling technique is analysed in terms of dimensional stability in the film. The description of tube testing and installation is preceded by sections based on reading research. The thesis opens with a review of the development of image tubes for astronomy which covers electronographic, phosphor-output and signal-generating (TV-type) tubes. This is followed by a discussion of the process of electronography and the properties of electron-sensitive emulsions that are of particular interest to astronomers. A third chapter presents a detailed description of the Spectracon image tube and gives an account of its expected performance. The thesis concludes with the recommendations that another Spectracon be acquired to fulfil the role envisaged for the tube described in the thesis, and that an electronographic image tube facility be developed to fully exploit the advantages of electronography in the area of field photometry.
bp Andrzej Siemieniewski, ks. Mirosław Kiwka, Chrześcijańska medytacja monologiczna. Źródła i aktualne pytania, Wydawnictwo TUM, Wrocław 2013, ss. 163.
Creators: name: Groń, Ryszard
Publisher: name: Wrocławski Przegląd Teologiczny
Year: 2019

description: Wrocławski Przegląd Teologiczny, Vol 23 No 1 (2015)
Inflating and Deflating Hot Jupiters: Coupled Tidal and Thermal Evolution of Known Transiting Planets
Creators: name: Miller, N.
name: Fortney, J. J.
name: Jackson, B.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We examine the radius evolution of close-in giant planets with a planet evolution model that couples the orbital-tidal and thermal evolution. For 45 transiting systems, we compute a large grid of cooling/contraction paths forward in time, starting from a large phase space of initial semi-major axes and eccentricities. Given observational constraints at the current time for a given planet (semi-major axis, eccentricity, and system age) we find possible evolutionary paths that match these constraints, and compare the calculated radii to observations. We find that tidal evolution has two effects. First, planets start their evolution at larger semi-major axis, allowing them to contract more efficiently at earlier times. Second, tidal heating can significantly inflate the radius when the orbit is being circularized, but this effect on the radius is short-lived thereafter. Often circularization of the orbit is proceeded by a long period while the semi-major axis slowly decreases. Some systems with previously unexplained large radii that we can reproduce with our coupled model are HAT-P-7, HAT-P-9, WASP-10, and XO-4. This increases the number of planets for which we can match the radius from 24 (of 45) to as many as 35 for our standard case, but for some of these systems we are required to be viewing them at a special time around the era of current radius inflation. This is a concern for the viability of tidal inflation as a general mechanism to explain most inflated radii. Also, large initial eccentricities would have to be common. We also investigate the evolution of models that have a floor on the eccentricity, as may be due to a perturber. In this scenario we match the extremely large radius of WASP-12b. (Abridged)
description: 18 pages, 14 figures, 2 tables, Accepted for publication in ApJ