cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A study of the properties of transient changes in the cosmic ray intensity.
Creators: name: McCracken, Kenneth G
Publisher: name: University Of Tasmania
Year: 2023

description: Three decades of research have shown that the cosmic ray intensity varies with time. Some of the variations have been shown to be due to atmospheric changes, while others are apparently produced by extra-terrestrial mechanisms. It is now known that most of the variations are small, of the order of a few percent, and that they do not correlate simply with other geophysical phenomena. In order to study them satisfactorily, recorders must be constructed such that the statistical fluctuations in the observations are considerably smaller than the cosmic ray variations themselves. It has become clear that the only worthwhile observational programme is a long term one, lasting for at least a number of years. A number of different types of cosmic ray detector have been developed, among these being the ionization chamber, the geiger counter telescope and the neutron monitor. It has been shown that comparison of neutron monitor data with those from either of the other instruments yields information on the manner in which the cosmic ray spectrum varies with time. Similar information is provided by the comparison of results obtained at high and low geomagnetic latitudes. Furthermore, observatories at different longitudes enable the directional dependence of the variations to be determined. Late in 1953 the University of Tasmania commenced observations of the vertical meson intensity at Hobart using a large geiger counter telescope. During 1954 and early 1955 the candidate, in partial fulfilment of the requirements of the Degree of Bachelor of Science with Honours, investigated and eliminated faults which had previously prevented an ionization chamber from being operated successfully. Thus by the end of 1955, the cosmic ray intensity at Hobart was being measured by two different types of recorder. In the latter half of 1955) I undertook to design and construct a neutron monitor. Boron Trifluoride counters were purchased from a commercial firm, and by June, 1956, a prototype monitor was in operation at Hobart. In order to achieve a higher counting rate, it was decided to site the monitor on the slopes of Mt. Wellington, the mountain at whose foot Hobart is situated. A hut was built and by the middle of July, 1956, the monitor had been transferred from Hobart and was in fully automatic operation.
Construction of an isotropic cellular automaton for a reaction-diffusion equation by means of a random walk
Creators: name: Nishiyama, A.
name: Tokihiro, T.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We propose a new method to construct an isotropic cellular automaton corresponding to a reaction-diffusion equation. The method consists of replacing the diffusion term and the reaction term of the reaction-diffusion equation with a random walk of microscopic particles and a discrete vector field which defines the time evolution of the particles. The cellular automaton thus obtained can retain isotropy and therefore reproduces the patterns found in the numerical solutions of the reaction-diffusion equation. As a specific example, we apply the method to the Belousov-Zhabotinsky reaction in excitable media.
Gravitinos, the Lithium problem, and DM production: Is there a corresponding neutrino physics linkage?
Creators: name: Beckwith, A. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Studies are cited indicating that gravitino production acts as a natural upper bound to Li6 and Li7 levels, based on what happens after hadronic decay of relic 1 TeV into 100 GeV gravitinos at 1000 s. after the Big Bang. The produced gravitinos contribute a large fraction of required dark matter density. Whether or not gravitinos can be linked to neutrino production depends on which model of dark matter (DM) is assumed or used. A model presented by the author in 2008 links DM of about 100 GeV -- based on a phenomenological Lagrangian creating different Neutrino masses without SUSY -- with a dark matter candidate of about 100 GeV. This may tie in 100 GeV gravitinos with neutrino physics.
description: 2 pages, no figures. New article in a sequel of DM applications articles. Conference entry to Rencontres De Moriond, for the Cosmology meeting, February 2009, to be published late 2009 by the Gioi company of Vietnam
Structure of locally convex quasi $C^*$-algebras
Creators: name: Bagarello, F.
name: Fragoulopoulou, M.
name: Inoue, A.
name: Trapani, C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The completion of a (normed) $C^*$-algebra $A_0[\| \cdot \|_0]$ with respect to a locally convex topology $τ$ on $A_0$ that makes the multiplication of $A_0$ separately continuous is, in general, a quasi *-algebra, and not a locally convex *-algebra. In this way, one is led to consideration of locally convex quasi $C^*$-algebras, which generalize $C^*$-algebras in the context of quasi *-algebras. Examples are given and the structure of these relatives of $C^*$-algebras is investigated.
Measuring the quality of a quantum reference frame: the relative entropy of frameness
Creators: name: Gour, Gilad
name: Marvian, Iman
name: Spekkens, Robert W.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the absence of a reference frame for transformations associated with a group G, any quantum state that is non-invariant under the action of G may serve as a token of the missing reference frame. We here introduce a novel measure of the quality of such a token: the relative entropy of frameness. This is defined as the relative entropy distance between the state of interest and the nearest G-invariant state. Unlike the relative entropy of entanglement, this quantity is straightforward to calculate and we find it to be precisely equal to the G-asymmetry, a measure of frameness introduced by Vaccaro et al. It is shown to provide an upper bound on the mutual information between the group element encoded into the token and the group element that may be extracted from it by measurement. In this sense, it quantifies the extent to which the token successfully simulates a full reference frame. We also show, that despite a suggestive analogy from entanglement theory, the regularized relative entropy of frameness is zero and therefore does not quantify the rate of interconversion between the token and some standard form of quantum reference frame. Finally, we show how these investigations yield a novel approach to bounding the relative entropy of entanglement.
description: 12 pages; many improvements in v2 including a weakening of the assumptions of the main theorem and better upper bounds for both the relative entropy of frameness for arbitrary compact Lie groups and the relative entropy of entanglement. Published version
On the localized wave patterns supported by convection-reaction-diffusion equation
Creators: name: Vladimirov, Vsevolod A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: A set of traveling wave solution to convection-reaction-diffusion equation is studied by means of methods of local nonlinear analysis and numerical simulation. It is shown the existence of compactly supported solutions as well as solitary waves within this family for wide range of parameter values.
House, the family and domesticity as central images in Dickens' novels
Creators: name: Cromwell, Alexandra Freya
Publisher: name: University of British Columbia
Year: 2011

description: More than any other Victorian novelist, it is Dickens who has been regarded as a fit subject for reading aloud in the family group. This thesis represents an attempt to understand how, in his fiction, Dickens regards and makes use of the concept of the family group, how the domestic interior relates itself to other aspects of the novels. It soon becomes apparent, as this inquiry is made, that the image of the domestic interior is central to Dickens’ novels and the thesis undertakes an examination of, primarily, two novels in order to demonstrate that this is so. The two novels chosen, Martin Chuzzlewit and Bleak House, were written with an interval of about nine years between them. The former stands at the end of what might be called the first stage of Dickens’ career but it looks, in some respects, towards the later novels, of which Bleak House is one of the first. In Martin Chuzzlewit we see a novel whose concerns are with the family and the problems of authority, paternity, selfishness and altruism. These concerns are expressed through descriptions of the places in which family groups reside or by an investigation of what takes place within those residences. Investigated, too, are the reasons for which the Individual leaves home and the consequences of such a leaving. It is concerns such as these which link the English and American sections of the novel. Bleak House raises similar questions but extends and examines them in a structure which embraces English society as a whole. The examination, that is, is more complex than that undertaken in Martin Chuzzlewit. Nevertheless, it too is concerned with family life and, through his observations on a number of households and the individuals included in and excluded from them, Dickens expresses his criticism of society in its entirety. The house is a house but it is also a metaphor for the larger organization of England. Through understanding the quality of the life lived within the houses which Dickens describes, the reader can understand many of the values embodied in the novels. Dickens recognized that the nature of a nation's life as a whole is largely dependent upon the nature of the life lived within each individual household. The connection between the house and the civilization is a close one, as we see in Martin Chuzzlewit. Houses, however, are relatively fixed structures and in Bleak House the notions of tradition, of time and change, decay and corruption are explored through their association with the house, and hence the novel’s concern with the new industrialism which is examined as it defines itself in relation to domesticity and the family circle.
Interplay among helical order, surface effects and range of interacting layers in ultrathin films
Creators: name: Cinti, Fabio
name: Rettori, Angelo
name: Cuccoli, Alessandro
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The properties of helical thin films have been thoroughly investigated by classical Monte Carlo simulations. The employed model assumes classical planar spins in a body-centered tetragonal lattice, where the helical arrangement along the film growth direction has been modeled by nearest neighbor and next-nearest neighbor competing interactions, the minimal requirement to get helical order. We obtain that, while the in-plane transition temperatures remain essentially unchanged with respect to the bulk ones, the helical/fan arrangement is stabilized at more and more low temperature when the film thickness, n, decreases; in the ordered phase, increasing the temperature, a softening of the helix pitch wave-vector is also observed. Moreover, we show also that the simulation data around both transition temperatures lead us to exclude the presence of a first order transition for all analyzed sizes. Finally, by comparing the results of the present work with those obtained for other models previously adopted in literature, we can get a deeper insight about the entwined role played by the number (range) of interlayer interactions and surface effects in non-collinear thin films.
description: 7 pages, 10 figures
Quantum Hall Effect in Bilayer Graphene: Disorder Effect and Quantum Phase Transition
Creators: name: Ma, R.
name: Sheng, L.
name: Shen, R.
name: Liu, M.
name: Sheng, D. N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We numerically study the quantum Hall effect (QHE) in bilayer graphene based on tight-binding model in the presence of disorder. Two distinct QHE regimes are identified in the full energy band separated by a critical region with non-quantized Hall Effect. The Hall conductivity around the band center (Dirac point) shows an anomalous quantization proportional to the valley degeneracy, but the $ν=0$ plateau is markedly absent, which is in agreement with experimental observation. In the presence of disorder, the Hall plateaus can be destroyed through the float-up of extended levels toward the band center and higher plateaus disappear first. The central two plateaus around the band center are most robust against disorder scattering, which is separated by a small critical region in between near the Dirac point. The longitudinal conductance around the Dirac point is shown to be nearly a constant in a range of disorder strength, till the last two QHE plateaus completely collapse.
description: 6 pages, 6 figures
Topological partial *-algebras: Basic properties and examples
Creators: name: Antoine, J. -P.
name: Bagarello, F.
name: Trapani, C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Let $A$ be a partial *-algebra endowed with a topology $τ$ that makes it into a locally convex topological vector space $A[τ]$. Then $A$ is called a topological partial *-algebra if it satisfies a number of conditions, which all amount to require that the topology $τ$ fits with the multiplier structure of $A$ Besides the obvious cases of topological quasi *-algebras and CQ*-algebras, we examine several classes of potential topological partial *-algebras, either function spaces (lattices of $L^p$ spaces on $[0,1]$ or on $\mathbb R$, amalgam spaces), or partial *-algebras of operators (operators on a partial inner product space, O*-algebras).
Frequency sweep for a beam system with local unilateral contact modeling satellite solar arrays
Creators: name: Hazim, Hamad
name: Rousselet, B.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: In order to save mass of satellite solar arrays, the flexibility of the panels becomes not negligible and they may strike each other; this may damage the structure. To prevent this, rubber snubbers are mounted at well chosen points of the structure and they act as one sided linear spring; as a negative consequence, the dynamic of these panels becomes nonlinear. The finite element approximation is used to solve partial differential equations governing the structural dynamic. Frequency sweep has been performed numerically to study the dynamic behavior. Non linear normal modes are under study
The demand for telephone services in Australia
Creators: name: Madden, G G
Publisher: name: University Of Tasmania
Year: 2023

description: The objective of this study is to develop and estimate demand models for residential telephone network subscription and calling demands, where the household is the basic decision unit. The analysis assumes that households consider the subscription-calling rate structure in determining the household telephone service demands and that the demands are conditioned by the socio-demographic characteristics of the household. Model estimation requires household network subscription and calling data under different rate structures. Because alterations to the subscription-calling rate structure are both infrequent and small in magnitude, stated-preference experimental design methods are employed as an alternative data source. The household's subscription probability is assumed logit while the calling demand equations are assumed a seemingly unrelated system. The model is estimated by continuous/discrete econometric methods. Estimates of the parameters are provided for the economic variables and socio-demographic variables specifications of the model for the Sydney Metropolitan Area, Penrith and New South Wales Country regions. The estimates indicate that both the household network subscription and calling demands are affected by the rate structure and household socio-demographic variables. Base and hypothetical rate structure scenario simulations for the Sydney Metropolitan Area show that rate structures substantially impact on quarterly household telephone communication expenditures.
THAPBI PICT – a metabarcoding analysis pipeline developed as a Phytophthora ITS1 Classification Tool
Creators: name: Cock, Peter
name: Cooke, David
name: Pritchard, Leighton
Publisher: name: F1000 Research Limited
Year: 2020

description: Molecular barcodes are central to environmental monitoring and identification of species present in a sample, and use PCR primers to amplify a diagnostic genome region of the organisms of interest. We are interested in metabarcoding where multiple samples are multiplexed for high-throughput sequencing on the Illumina platform, using overlapping paired end reads. Each sample yields a collection of marker sequences, and matching these to a database of known species produces a taxonomic breakdown reflecting community composition.

THAPBI PICT is a metabarcoding tool we developed for the UK funded Tree Health and Plant Biosecurity Initiative (THAPBI) Phyto-Threats project, which focused on identifying Phytophthora species in commercial tree nurseries. Phytophthora (from Greek meaning plant-destroyer) are economically important plant pathogens, important in both agriculture and forestry. This project targeted an ITS1 marker (Internal Transcribed Spacer one, a region found in eukaryotic genomes between the 18S and 5.8S rRNA genes) with nested primers to identify Phytophthora species. By varying primer settings and using a custom database, THAPBI PICT can be applied to other organisms and/or barcode marker sequences - making it more than just a Phytophthora ITS1 Classification Tool (PICT).

The analysis pipeline starts from demultiplexed paired FASTQ files, as produced by the Illumina MiSeq platform. These are quality trimmed, overlapping reads merged and primer trimmed (calling external tools) and then deduplicated giving a much smaller list of unique sequences and associated read counts (passing a minimum count threshold intended to exclude ”noise”). These are matched to a curated database using a range of methods, producing both plain text and formatted Excel output. An edit graph in XGMML format is also produced for display in Cytoscape and other visualisation tools.

THAPBI PICT is released as open source software under the MIT licence. It is written in Python, a free open source language available on all major operating systems. Version control using git hosted publicly on GitHub is used for the source code, documentation, and database builds including tracking the hand-curated reference set of Phytophthora ITS1 sequences. Continuous integration of the test suite is currently run on both TravisCI and CircleCI. Software is released to the Python Packaging Index (PyPI) as standard for the Python ecosystem, and additionally packaged for Conda via the BioConda channel. This offers simple installation of the tool itself, and all the command line dependencies on Linux or macOS. The documentation is currently hosted on Read The Docs, updated automatically from the GitHub repository

Repository: https://github.com/peterjc/thapbi-pict/
Documentation: https://thapbi-pict.readthedocs.io/
License: MIT
Analytic bounds on transmission probabilities
Creators: name: Boonserm, Petarpa
name: Visser, Matt
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We develop some new analytic bounds on transmission probabilities (and the related reflection probabilities and Bogoliubov coefficients) for generic one-dimensional scattering problems. To do so we rewrite the Schrodinger equation for some complicated potential whose properties we are trying to investigate in terms of some simpler potential whose properties are assumed known, plus a (possibly large) "shift" in the potential. Doing so permits us to extract considerable useful information without having to exactly solve the full scattering problem.
description: 19 pages
Video and image coding for broadband integrated services digital networks
Creators: name: McLaren, David L
Publisher: name: University Of Tasmania
Year: 2023

description: The growing demand for visual telecommunication services over the last decade has greatly increased the need for efficient image coding and compression schemes. The work presented in this thesis examines several aspects of the problem of coding and compressing the various image and video-based services which are likely to utilize Broadband Integrated Services Digital Networks (BISDNs) in the future. This research has two major thrusts. The first is the development of a general-purpose, high-performance and high-quality image coding and compression scheme for these broadband-based visual services. The second is the development of an accurate traffic source modelling scheme for the Variable BitRate (VBR) packet video traffic produced by the proposed coding scheme. The proposed high-performance visual coding and compression scheme combines both statistical and psychovisual coding techniques to produce an optimum scheme which removes both statistical and psychovisual redundancies from images in the coding process. When used to encode four standard 512x512x8-bit test images, this scheme results in sub-distortion compression ratios of up to 27:1 without the use of any form of interframe coding. An efficient and flexible Asynchronous Transfer Mode (ATM) cell packaging scheme is also developed which allows the production of either 'priority' or 'non-priority' cell streams suitable for transmission over broadband networks. Three suitable VBR packet video traffic source models are developed during this study. Each of these sources reproduces the 'low-level' cell generation process and switches between different 'modes' of cell generation in order to capture the inherent `burstiness' and 'variability' of typical VBR packet video traffic streams. However, the way in which this cell production process is modelled, as well as the traffic levels which can be reproduced, differs for each of these sources. A relatively complex, general-purpose traffic source is proposed which is based on the hidden Markov statistical model and is able to model all levels of VBR traffic (up to 20 Mbps). A simpler 'switched-fractal' source is also proposed as an accurate model for the low (below 5 Mbps) VBR traffic only. The third proposed source is a 'switched-Markov' model which specifically caters for the high (5 to 20 Mbps) levels of VBR traffic. Among these three artificial traffic sources, the characteristics of all levels of traffic produced by the proposed video and image coding scheme are able to be reproduced accurately.
Options for reducing land transport fuel use in Tasmania
Creators: name: Hoey, CD
Publisher: name: University Of Tasmania
Year: 2023

description: This thesis considers the possibility of reducing land transp6rt fuel use in Tasmania. The consumption of petroleum products, of which the transport sector is the largest user, currently accounts for approximately 40 per cent of total energy consumed in Tasmania. The Toronto Target, which requires a reduction in emissions of greenhouse gas by 20 per cent of 1988 levels by 2005, is used as an example to consider what prospects are open for Tasmania to reduce emissions with respect to the transport sector. Other transport related pollutants are also examined. The use of alternative transport fuels is evaluated regarding the possible contribution in aiding a reduction in greenhouse gas emissions. Transport in Tasmania is divided into sectors according to function, which includes private, public and commercial transport operations. These sectors are evaluated in terms of their contribution to total transport fuel use and their ability to yield reductions. The structure of urban form, in particular the development of low density suburban housing, is examined with regard to the way in which it contributes to transport energy use. The thesis concludes with suggestions for a number of possible strategies aimed toward reduction of total fuel consumption over an estimated level for 2005, although the reduction is insufficient to meet the requirements of the Toronto Target. -
How to write science policy pieces
Creators: name: Bankston, Adriana
Publisher: name: F1000 Research Limited
Year: 2020

description: This talk was given in the Science Policy & Advocacy Certificate Program for STEM Scientists (writing module), which is part of the Public Policy Prep (P3) Program of University of California Irvine' GPS-STEM (virtual presentation, July 20, 2020).
Mapping between the order of thermal denaturation and the shape of the critical line of mechanical unzipping in 1-dimensional DNA models
Creators: name: Buyukdagli, Sahin
name: Joyeux, Marc
Publisher: name: arXiv
Year: 2010
Subjects: subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: In this Letter, we investigate the link between thermal denaturation and mechanical unzipping for two models of DNA, namely the Dauxois-Peyrard-Bishop model and a variant thereof we proposed recently. We show that the critical line that separates zipped from unzipped DNA sequences in mechanical unzipping experiments is a power-law in the temperature-force plane. We also prove that for the investigated models the corresponding critical exponent is proportional to the critical exponent alpha, which characterizes the behaviour of the specific heat in the neighbourhood of the critical temperature for thermal denaturation.
Out-of-memory computing with matter
Creators: name: Bemis, Kylie A
Publisher: name: F1000 Research Limited
Year: 2020

description: A growing challenge in bioinformatics is the proliferation of large, heterogenous datasets, stored across many disjoint files and in specialized file formats. Often, these datasets exceed computer memory, either individually or in aggregate. Recent solutions for working with out-of-memory data on Bioconductor have focused on utilizing the HDF5 scientific format in combination with the DelayedArray package. However, this requires conversion to HDF5, which may not be the most efficient choice for every workflow.

We present the matter package, which provides a flexible interface to file-based data without requiring explicit conversion. It enables users to specify custom data formats, and aggregate data from many files into a single R matrix, array, or data frame. This is achieved by a flexible data model that abstracts the structure of the on-storage data from the in-memory representation. Compared with similar packages including bigmemory or ff, matter typically performs similarly or better.

To demonstrate the utility of matter, we consider mass spectrometry (MS) imaging as a case study. MS imaging has adopted imzML as a common open-source file format for sharing data. However, a single imzML file may be very large (10s or 100s of GB) for high-resolution MS experiments, and a single experiment may include data from dozens of files. We demonstrate how matter integrates with the Cardinal MSI package to enable analysis of larger-than-memory MS imaging experiments.

Lastly, we present a roadmap for matter, and how it fits into your workflow and the overall Bioconductor ecosystem, including future integration with DelayedArray for easier cross-compatibility, as well as recent developments using the new ALTREP framework for representing S4 matter matrices as native R matrices even in compiled code.
Computational meta-analysis of transcriptome in Tetrology of Fallot reveals dysregulated hubs and pathways
Creators: name: Charles, Sona
name: Natarajan, Jeyakumar
Publisher: name: F1000 Research Limited
Year: 2020

description: Tetrology of Fallot (TOF) is a combinatorial congenital abnormality comprising ventricular septal defect (VSD), pulmonary valve stenosis, a misplaced aorta and a thickened right ventricular wall. The present study aims to inspect the pathways and genes associated with Tetrology of Fallot. Raw transcriptomic data of mRNA and sRNA related to TOF from two datasets GSE36761 (mRNASeq) and GSE36759 (small RNAseq) having 30 samples were downloaded from SRA database. Differential expression of mRNAs and sRNAs were analyzed. KEGG Pathway enrichment analysis and Gene Ontology Analysis was performed for the differentially expressed genes. Significant modules of DEGs were obtained after constructing an interaction network. Latent pathway identification analysis was performed on the DEGs and KEGG pathways and a bipartite network was constructed. DEGs connected to more than 3 pathways were considered as hubs since a single dysregulation can lead to perturbations in three pathways. The study indicates GATA6 and GATA4 to show highest connectivity in the TOF bipartite network. Comprehensive analysis of TOF genes and pathways can shed light on the molecular pathogenesis of TOF and identification of potential therapeutic targets and biomarkers in disease prediction.
Flavor Twisted Boundary Conditions and the Nucleon Vector Current
Creators: name: Jiang, F. -J.
name: Tiburzi, B. C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Using flavor twisted boundary conditions, we study nucleon matrix elements of the vector current. We twist only the active quarks that couple to the current. Finite volume corrections due to twisted boundary conditions are determined using partially twisted, partially quenched, heavy baryon chiral perturbation theory, which we develop for the graded group SU(7|5). Asymptotically these corrections are exponentially small in the volume, but can become pronounced for small twist angles. Utilizing the Breit frame does not mitigate volume corrections to nucleon vector current matrix elements. The derived expressions will allow for better controlled extractions of the isovector magnetic moment and the electromagnetic radii from simulations at zero lattice momentum. Our formalism, moreover, can be applied to any nucleon matrix elements.
description: 32 pages, 7 figures
Study of working memory impairment in schizophrenia patients
Creators: name: Indranath Chatterjee
name: Rana, Bharti
name: Agarwal, Manoj
name: Kumar, Naveen
Publisher: name: F1000 Research Limited
Year: 2020

description: Patients with schizophrenia may exhibit deficiency in the working memory amongst other symptoms like hallucinations and delusions. Functional magnetic resonance imaging (fMRI) is an imaging method that has shown potential in understanding brain activity in psychiatric diseases. However, improved methods for the analysis of fMRI data are continuously evolving. In this direction, group independent component analysis (GICA) has been integrated with the standard statistical measures for feature extraction and selection for classification of working memory task fMRI data. The proposed approach yields high classification accuracy using linear SVM and k-NN classifiers. It also yields different brain regions which are mostly affected by schizophrenia leading to impairment of the working memory of the patients.
Unbounded C$^*$-seminorms and $*$-Representations of 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 main purpose of this paper is to construct *-representations from unbounded C$^*$-seminorms on partial *-algebras and to investigate their *-representations.
Il progetto 3DLab-Sicilia
Creators: name: Barbera, Roberto
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.
Dynamic buckling of plates under impact loading
Creators: name: Loh, See-Kok
Publisher: name: University of British Columbia
Year: 2011

description: A theory is presented to examine the formation of wrinkles in plates when subjected to high rates of loading in the axial direction. The type of instability examined occurs in metals when the strains are well beyond the elastic range. For this reason the metals are assumed to be governed by the equations of a rigid plastic material. In particular, the von-Mises yield criterion is used in conjunction with the Levy-Mises flow rule. A parameter is introduced which measures the lateral restraint of the plate. By giving this parameter different values, all plate widths can be examined. The theory predicts wavelengths of the buckled plates which are compared with some experimental results obtained in 1968 by Goodier.
Alkaloids from an ascidian and two bryozoans from Tasmania
Creators: name: Li, Caiping
Publisher: name: University Of Tasmania
Year: 2023

description: Detailed chemical examination of the alkaloid content of an ascidian (Clavelina cylindrica) and two bryozoans (Bugula dentata and Hincksinoflustra denticulata) have been undertaken. A total of 21 alkaloids were obtained of which 18 were novel. Two new classes of pyrroloquinoline (cylindricines A, C, D, E, F, G, H, I, K) and pyridoquinoline alkaloids (cylindricines B, J) have been isolated from the ascidian Clavelina cylindrica. This is the first time that the pyridoquinoline ring system has been obtained as a natural product or a synthetic compound, while this is the first occasion that the pyrroloquinoline ring system has been discovered in nature. All together a total of 12 alkaloids were isolated from this ascidian, 11 of them (cylindricines A-K) are novel alkaloids and one (wakayin chloride) had been described previously from another ascidian. Cylindricines A and B, are readily interconvertible via a ring opening closing reaction and a mechanism has been proposed to account for this. Cylindricines F, G, and H are thiocyanates, and cylindricines I and J are isothiocyanates, the first known from an ascidian. Spectroscopic and chemical evidence for the structures of the 12 alkaloids are presented. X-ray crystallographic studies confirmed the structures of two of them (cylindricines A and B), and established the relative stereochemistry, chemical transformations and computer modelling were also used to confirm some of the structures... Six alkaloids belonging to the tambjamine class (tambjamines C, E, G, H, I, J) were obtained from the bryozoan Bugula dentata. Four of them (tambjamines G, H, I, J) are novel alkaloids while two of them .had been described previously from an ascidian and a bryozoan (tambjamines C, E). Spectroscopic and chemical evidence for the structures of the 6 alkaloids are presented... From the bryozoan Hincksinoflustra denticulata three new alkaloids have been isolated. Hinckorfordines A and B both possess the same 1H-azepino[4,5- o]quinindoline new ring system. The structure of hinckorfordine A was determined by spectroscopy and confirmed by an x-ray crystallographic study. The structures of hinckorfordine B and hinckdentine B were elucidated by comparison of the spectral data with those of hinckorfordine A and hinckdentine A.
Catastrophic cascade of failures in interdependent networks
Creators: name: Buldyrev, Sergey V.
name: Parshani, Roni
name: Paul, Gerald
name: Stanley, H. Eugene
name: Havlin, Shlomo
Publisher: name: arXiv
Year: 2009
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Many systems, ranging from engineering to medical to societal, can only be properly characterized by multiple interdependent networks whose normal functioning depends on one another. Failure of a fraction of nodes in one network may lead to a failure in another network. This in turn may cause further malfunction of additional nodes in the first network and so on. Such a cascade of failures, triggered by a failure of a small faction of nodes in only one network, may lead to the complete fragmentation of all networks. We introduce a model and an analytical framework for studying interdependent networks. We obtain interesting and surprising results that should significantly effect the design of robust real-world networks. For two interdependent Erdos-Renyi (ER) networks, we find that the critical average degree below which both networks collapse is =2.445, compared to =1 for a single ER network. Furthermore, while for a single network a broader degree distribution of the network nodes results in higher robustness to random failure, for interdependent networks, the broader the distribution is, the more vulnerable the networks become to random failure.
16th OpenAIRE Content Providers Community Call
Creators: name: Príncipe, Pedro
Publisher: name: Zenodo
Year: 2021
Subjects: OpenAIRE
OpenAIRE Provide
Multi-user access

description: OpenAIRE Content Providers Community Call, October 6th, 2021. This call was an opportunity to discover the new Multi-User Access functionality deployed in PROVIDE, and discuss new features in the validator, the registration process and usage stats. Was also an opportunity to share the most recent updates and novelties in the OpenAIRE Content Provider Dashboard, and to get feedback from community. Recording: https://youtu.be/QGgB3XJcxKU
AO Vel: The role of multiplicity in the development of chemical peculiarities in late B-type stars
Creators: name: González, J. F.
name: Hubrig, S.
name: Castelli, F.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present high-resolution, high signal-to-noise UVES spectra of AO Vel, a quadruple system containing an eclipsing BpSi star. From these observations we reconstruct the spectra of the individual components and perform an abundance analysis of all four stellar members. We found that all components are chemically peculiar with different abundances patters. In particular, the two less massive stars show typical characteristics of HgMn stars. The two most massive stars in the system show variable line profiles indicating the presence of chemical spots. Given the youth of the system and the notable chemical peculiarities of their components, this system could give important insights in the origin of chemical anomalies.
description: 8 pages, 7 figures, 1 appendix. To be published in the Monthly Notices of the Royal Astronomical Society
Theory of Cross Phase Modulation for the Vibrational Modes of Trapped Ions
Creators: name: Nie, X. Rebecca
name: Roos, Christian F.
name: James, Daniel F. V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze nonlinear coupling between individual vibrational quanta for trapped ions. The nonlinear Coulomb interaction causes a Kerr-type Hamiltonian, for which we derive an analytical expression for the coupling constant. In contrast to a previously published formula [1], our result is in close agreement with experimental data.
description: 4 pages, 2 figures, and 1 table
An operatorial approach to stock markets
Creators: name: Bagarello, F.
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Finance (q-fin.GN)
subject: FOS: Economics and business

description: We propose and discuss some toy models of stock markets using the same operatorial approach adopted in quantum mechanics. Our models are suggested by the discrete nature of the number of shares and of the cash which are exchanged in a real market, and by the existence of conserved quantities, like the total number of shares or some linear combination of cash and shares. The same framework as the one used in the description of a gas of interacting bosons is adopted.
Inhomogeneous spectral moment sum rules for the retarded Green function and self-energy of strongly correlated electrons or ultracold fermionic atoms in optical lattices
Creators: name: Freericks, J. K.
name: Turkowski, V.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Spectral moment sum rules are presented for the inhomogeneous many-body problem described by the fermionic Falicov-Kimball or Hubbard models. These local sum rules allow for arbitrary hoppings, site energies, and interactions. They can be employed to quantify the accuracy of numerical solutions to the inhomogeneous many-body problem like strongly correlated multilayered devices, ultracold atoms in an optical lattice with a trap potential, strongly correlated systems that are disordered, or systems with nontrivial spatial ordering like a charge density wave or a spin density wave. We also show how the spectral moment sum rules determine the asymptotic behavior of the Green function, self-energy, and dynamical mean field, when applied to the dynamical mean-field theory solution of the many body problem. In particular, we illustrate in detail how one can dramatically reduce the number of Matsubara frequencies needed to solve the Falicov-Kimball model, while still retaining high precision, and we sketch how one can incorporate these results into Hirsch-Fye quantum Monte Carlo solvers for the Hubbard (or more complicated) models. Since the solution of inhomogeneous problems is significantly more time consuming than periodic systems, efficient use of these sum rules can provide a dramatic speed up in the computational time required to solve the many-body problem. We also discuss how these sum rules behave in nonequilibrium situations as well, where the Hamiltonian has explicit time dependence due to a driving field or due to the time-dependent change of a parameter like the interaction strength or the origin of the trap potential.
description: (28 pages, 6 figures, ReVTeX) Paper updated to correct equations 11, 24, and 28
Intersection local times of independent fractional Brownian motions as generalized white noise functionals
Creators: name: Oliveira, Maria Joao
name: da Silva, Jose Luis
name: Streit, Ludwig
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60H40, 60G15, 60J55, 28C20, 46F25, 82D60

description: In this work we present expansions of intersection local times of fractional Brownian motions in $\R^d$, for any dimension $d\geq 1$, with arbitrary Hurst coefficients in $(0,1)^d$. The expansions are in terms of Wick powers of white noises (corresponding to multiple Wiener integrals), being well-defined in the sense of generalized white noise functionals. As an application of our approach, a sufficient condition on $d$ for the existence of intersection local times in $L^2$ is derived, extending the results of D. Nualart and S. Ortiz-Latorre in "Intersection Local Time for Two Independent Fractional Brownian Motions" (J. Theoret. Probab.,20(4)(2007), 759-767) to different and more general Hurst coefficients.
description: 28 pages
Tomography of a quark gluon plasma at RHIC and LHC energies
Creators: name: Gossiaux, P. B.
name: Bierkandt, R.
name: Aichelin, J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Using the recently published model for the collisional energy loss of heavy quarks (Q) in a Quark Gluon Plasma (QGP), based on perturbative QCD (pQCD) with a running coupling constant, we study the interaction between heavy quarks and plasma particles in detail. We discuss correlations between the simultaneously produced $c$ and $\bar{c}$ quarks, study how central collisions can be experimentally selected, predict observable correlations and extend our model to the energy domain of the large hadron collider (LHC). We finally compare the predictions of our model with that of other approaches like AdS/CFT.
description: details about coalescence added, accepted by PRC
LHC Signals for Warped Electroweak Charged Gauge Bosons
Creators: name: Agashe, Kaustubh
name: Gopalakrishna, Shrihari
name: Han, Tao
name: Huang, Gui-Yu
name: Soni, Amarjit
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study signals at the Large Hadron Collider (LHC) for the Kaluza-Klein (KK) excitations of electroweak charged gauge bosons in the framework of the Standard Model (SM) fields propagating in the bulk of a warped extra dimension. Such a scenario can solve both the Planck-weak and flavor hierarchy problems of the SM. There are two such charged states in this scenario with couplings to light quarks and leptons being suppressed relative to those in the SM, whereas the couplings to top/bottom quarks are enhanced, similar to the case of electroweak neutral gauge bosons previously studied. However, unlike the case of electroweak neutral gauge bosons, there is no irreducible QCD background (including pollution from possibly degenerate KK gluons) for decays to top + bottom final state so that this channel is useful for the discovery of the charged states. Moreover, decays of electroweak charged gauge bosons to longitudinal W, Z and Higgs are enhanced just as for the neutral bosons. However, unlike for the neutral gauge bosons, the purely leptonic (and hence clean) decay mode of the WZ are fully reconstructible so that the ratio of the signal to the SM (electroweak) background can potentially be enhanced by restricting to the resonance region more efficiently. We show that such final states can give sensitivity to 2 (3) TeV masses with an integrated luminosity of 100 (300) inverse fb. We emphasize that improvements in discriminating a QCD-jet from a highly boosted hadronically decaying W, and a highly boosted top-jet from a bottom-jet will enhance the reach for these KK particles, and that the signals we study for the warped extra dimensional model might actually be applicable also to a wider class of non-supersymmetric models of electroweak symmetry breaking.
description: 40 pages
Nonlinear electromagnetic wave equations for superdense magnetized plasmas
Creators: name: Shukla, N.
name: Brodin, G.
name: Marklund, M.
name: Shukla, P. K.
name: Stenflo, L.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: By using the quantum hydrodynamic and Maxwell equations, we derive nonlinear electron-magnetohydrodynamic (MHD), Hall-MHD, and dust Hall-MHD equations for dense quantum magnetoplasmas. The nonlinear equations include the electromagnetic, the electron pressure gradient, as well as the quantum electron tunneling and electron spin forces. They are useful for investigating a number of wave phenomena including linear and nonlinear electromagnetic waves, as well as three-dimensional electromagnetic wave turbulence spectra arising from the mode coupling processes in dense magnetoplasmas.
description: 5 pages