cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Sci-GaIA Newsletter - Issue no. 3 - January 2016
Creators: name: Consortium, The Sci-GaIA
Publisher: name: Sci-GaIA Open Access Repository
Year: 2016

description: The Sci-GaIA Partnership is very pleased to bring to your attention the latest developments in the field of Africa-EU cooperation on e-Infrastructures. The Sci-GaIA project aims to create a sustainable foundation of educational materials and procedures for the development and management of Science Gateways and e-Infrastructures in Africa and beyond.
α1-antitrypsin : a spectroscopic study of the folding and inhibitory pathways of a serpin
Creators: name: Tew., Deborah J.
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Relaxation of the resistive superconducting state in boron-doped diamond films
Creators: name: Kardakova, A.
name: Shishkin, A.
name: Semenov, A.
name: Ryabchun, S.
name: Bousquet, J.
name: Eon, D.
name: Sacepe, B.
name: Klein, Th.
name: Bustarret, E.
name: Goltsman, G. N.
name: Klapwijk, T. M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report a study of the relaxation time of the restoration of the resistive superconducting state in single crystalline boron-doped diamond using amplitude-modulated absorption of (sub-)THz radiation (AMAR). The films grown on an insulating diamond substrate have a low carrier density of about 2.5x10^{21} cm^{-3} and a critical temperature of about 2 K. By changing the modulation frequency we find a high-frequency rolloff which we associate with the characterstic time of energy relaxation between the electron and the phonon systems or the relaxation time for nonequilibrium superconductivity. Our main result is that the electron-phonon scattering time varies clearly as T^{-2}, over the accessible temperature range of 1.7 to 2.2 K. In addition, we find, upon approaching the critical temperature T_c, evidence for an increasing relaxation time on both sides of T_c.
description: 11 pages, 6 figures, 61 references
Efficient Algorithms for Mixed Creative Telescoping
Creators: name: Bostan, Alin
name: Dumont, Louis
name: Salvy, Bruno
Publisher: name: arXiv
Year: 2016
Subjects: subject: Symbolic Computation (cs.SC)
subject: FOS: Computer and information sciences
subject: I.1.2

description: Creative telescoping is a powerful computer algebra paradigm -initiated by Doron Zeilberger in the 90's- for dealing with definite integrals and sums with parameters. We address the mixed continuous-discrete case, and focus on the integration of bivariate hypergeometric-hyperexponential terms. We design a new creative telescoping algorithm operating on this class of inputs, based on a Hermite-like reduction procedure. The new algorithm has two nice features: it is efficient and it delivers, for a suitable representation of the input, a minimal-order telescoper. Its analysis reveals tight bounds on the sizes of the telescoper it produces.
description: To be published in the proceedings of ISSAC'16
Quantum hobbit routing: Annealer implementation of generalized Travelling Salesperson Problem
Creators: name: Delgado, Iñigo Perez
name: Markaida, Beatriz García
name: de Leceta, Aitor Moreno Fdez.
name: Uriarte, Jon Ander Ochoa
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: 81P68

description: In this paper, we present an implementation of a Job Selection Problem (JSP) -- a generalization of the well-known Travelling Salesperson Problem (TSP) -- of $N=9$ jobs on its Quadratic Unconstrained Binary Optimization (QUBO) form, using $\mathcal{O}(N)$ qubits on DWave's Advantage$\_$system4.1 quantum annealing device. The best known quantum algorithm for TSP to date uses $\mathcal{O}(N^2)$ qubits. A solution is found using the quantum method. However, since hardware is not yet able to compensate the increase in search-space size, no present overall advantage is achieved when comparing the quantum results with either exhaustive or equiprobably sampled classical solutions of the problem.
Effective Hamiltonian for surface states of \ce{Bi2Te3} nanocylinders with hexagonal warping
Creators: name: Siu, Zhuo Bin
name: Jalil, Mansoor B. A.
name: Tan, Seng Ghee
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The three-dimensional topological insulator \ce{Bi2Te3} differs from other topological insulators in the \ce{Bi2Se3} family in that the effective Hamiltonian of its surface states on a flat semi-infinite slab requires the addition of a cubic momentum hexagonal warping term in order to reproduce the experimentally measured constant energy contours. In this work, we derive the appropriate effective Hamiltonian for the surface states of a \ce{Bi2Te3} \textit{cylinder} incorporating the corresponding hexagonal warping terms in a cylindrical geometry. We show that at the energy range where the surface states dominate, the effective Hamiltonian adequately reproduces the dispersion relation obtained from a full four-band Hamiltonian, which describe both the bulk and surface states. As an example application of our effective Hamiltonian, we study the transmission between two collinear \ce{Bi2Te3} cylinders magnetized in different directions perpendicular to their axes. We show that the hexagonal warping term results in a transmission profile between the cylinders which may be of utility in a multiple state magnetic memory bit.
Recent Results from SPLASH: Chemical Abundances and Kinematics of Andromeda's Stellar Halo
Creators: name: Gilbert, Karoline M.
name: Beaton, Rachael L.
name: Dorman, Claire
name: collaboration, the SPLASH
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Large scale surveys of Andromeda's resolved stellar populations have revolutionized our view of this galaxy over the past decade. The combination of large-scale, contiguous photometric surveys and pointed spectroscopic surveys has been particularly powerful for discovering substructure and disentangling the structural components of Andromeda. The SPLASH (Spectroscopic and Photometric Landscape of Andromeda's Stellar Halo) survey consists of broad- and narrow-band imaging and spectroscopy of red giant branch stars in lines of sight ranging in distance from 2 kpc to more than 200 kpc from Andromeda's center. The SPLASH data reveal a power-law surface brightness profile extending to at least two-thirds of Andromeda's virial radius (Gilbert et al. 2012), a metallicity gradient extending to at least 100 kpc from Andromeda's center (Gilbert et al. 2014), and evidence of a significant population of heated disk stars in Andromeda's inner halo (Dorman et al. 2013). We are also using the velocity distribution of halo stars to measure the tangential motion of Andromeda (Beaton et al., in prep).
description: 6 pages, 5 figures. To be published in the proceedings of IAU symposium 317, "The General Assembly of Galaxy Halos: Structure, Origin and Evolution"
Parametric down-conversion with nonideal and random quasi-phase-matching
Creators: name: Yang, Chun-Yao
name: Lin, Chun
name: Liljestrand, Charlotte
name: Su, Wei-Min
name: Canalias, Carlota
name: Chuu, Chih-Sung
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quasi-phase-matching (QPM) has enriched the capacity of parametric down-conversion (PDC) in generating biphotons for many fundamental tests and advanced applications. However, it is not clear how the nonidealities and randomness in the QPM grating of a parametric down-converter may affect the quantum properties of the biphotons. This paper intends to provide insights into the interplay between PDC and nonideal or random QPM structures. Using a periodically poled nonlinear crystal with short periodicity, we conduct experimental and theoretical studies of PDC subject to nonideal duty cycle and random errors in domain lengths. We report the observation of biphotons emerging through noncritical birefringent-phase-matching, which is impossible to occur in PDC with an ideal QPM grating, and a biphoton spectrum determined by the details of nonidealities and randomness. We also observed QPM biphotons with a diminished strength. These features are both confirmed by our theory. Our work provides new perspectives for biphoton engineering with QPM.
On the global existence of spherically symmetric hairy black holes and solitons in anti-de Sitter Einstein-Yang-Mills theories with compact semisimple gauge groups
Creators: name: Baxter, J. Erik
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the existence of black hole and soliton solutions to four dimensional, anti-de Sitter (adS), Einstein-Yang-Mills theories with general semisimple connected and simply connected gauge groups, concentrating on the so-called "regular" case. We here generalise results for the asymptotically flat case, and compare our system with similar results from the well-researched adS $\mathfrak{su}(N)$ system. We find the analysis differs from the asymptotically flat case in some important ways: the biggest difference is that for $Λ<0$, solutions are much less constrained as $r\rightarrow\infty$, making it possible to prove the existence of global solutions to the field equations in some neighbourhood of existing trivial solutions, and in the limit of $|Λ|\rightarrow\infty$. In particular, we can identify non-trivial solutions where the gauge field functions have no zeroes, which in the $\mathfrak{su}(N)$ case proved important to stability.
description: 52 pages. arXiv admin note: text overlap with arXiv:gr-qc/0008042 by other authors
The DEVStone Metric: Performance Analysis of DEVS Simulation Engines
Creators: name: Cárdenas, Román
name: Henares, Kevin
name: Arroba, Patricia
name: Risco-Martín, José L.
name: Wainer, Gabriel A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Software Engineering (cs.SE)
subject: Performance (cs.PF)
subject: FOS: Computer and information sciences

description: The DEVStone benchmark allows us to evaluate the performance of discrete-event simulators based on the DEVS formalism. It provides model sets with different characteristics, enabling the analysis of specific issues of simulation engines. However, this heterogeneity hinders the comparison of the results among studies, as the results obtained on each research work depend on the chosen subset of DEVStone models. We define the DEVStone metric based on the DEVStone synthetic benchmark and provide a mechanism for specifying objective ratings for DEVS-based simulators. This metric corresponds to the average number of times that a simulator can execute a selection of 12 DEVStone models in one minute. The variety of the chosen models ensures we measure different particularities provided by DEVStone. The proposed metric allows us to compare various simulators and to assess the impact of new features on their performance. We use the DEVStone metric to compare some popular DEVS-based simulators.
Electroweak Naturalness and Deflected Mirage Mediation
Creators: name: Barger, Vernon
name: Everett, Lisa L.
name: Garon, Todd S.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the question of electroweak naturalness within the deflected mirage mediation (DMM) framework for supersymmetry breaking in the minimal supersymmetric standard model (MSSM). The class of DMM models considered are nine-parameter theories that fall within the general classification of the 19-parameter phenomenological MSSM (pMSSM). Our results show that these DMM models have regions of parameter space with very low electroweak fine-tuning, at levels comparable to the pMSSM. These parameter regions should be probed extensively in the current LHC run.
description: 17 Pages, 7 Figures
Understanding Deep Convolutional Networks
Creators: name: Mallat, Stéphane
Publisher: name: arXiv
Year: 2016
Subjects: subject: Machine Learning (stat.ML)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Deep convolutional networks provide state of the art classifications and regressions results over many high-dimensional problems. We review their architecture, which scatters data with a cascade of linear filter weights and non-linearities. A mathematical framework is introduced to analyze their properties. Computations of invariants involve multiscale contractions, the linearization of hierarchical symmetries, and sparse separations. Applications are discussed.
description: 17 pages, 4 Figures
A (Basis for a) Philosophy of a Theory of Fuzzy Computation
Creators: name: Syropoulos, Apostolos
Publisher: name: arXiv
Year: 2016
Subjects: subject: Other Computer Science (cs.OH)
subject: FOS: Computer and information sciences

description: Vagueness is a linguistic phenomenon as well as a property of physical objects. Fuzzy set theory is a mathematical model of vagueness that has been used to define vague models of computation. The prominent model of vague computation is the fuzzy Turing machine. This conceptual computing device gives an idea of what computing under vagueness means, nevertheless, it is not the most natural model. Based on the properties of this and other models of vague computing, it is aimed to formulate a basis for a philosophy of a theory of fuzzy computation.
Localized polariton states in a photonic crystal intercalated by a transition metal dichalcogenide monolayer
Creators: name: Bludov, Yuliy V.
name: Fernandes, Carlos
name: Peres, Nuno M. R.
name: Vasilevskiy, Mikhail I.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Beyond the extensively studied microcavity polaritons, which are coupled modes of semiconductor excitons and microcavity photons, nearly 2D semiconductors placed in a suitable environment can support spatially localized exciton-polariton modes. We demonstrate theoretically that two distinct types of such modes can exist in a photonic crystal with an embedded transition metal dichalcogenide (TMD) monolayer and derive an equation that determines their dispersion relations. The localized modes of two types occur in the zeroth- and first-order stop-bands of the crystal, respectively, and have substantially different properties. The latter type of the localized modes, which appear inside the light cone, can be described as a result of coupling of the TMD exciton and an optical Tamm state of the TMD-intercalated photonic crystal. We suggest an experiment for detecting these modes and simulate it numerically.
description: 2021 Optica Publishing Group. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited
Solid effect DNP polarization dynamics in a system of many spins
Creators: name: Wiśniewski, Daniel
name: Karabanov, Alexander
name: Lesanovsky, Igor
name: Köckenberger, Walter
Publisher: name: arXiv
Year: 2016
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We discuss the polarization dynamics during solid effect dynamic nuclear polarization (DNP) in a central spin model that consists of an electron surrounded by many nuclei. To this end we use a recently developed formalism and validate first its performance by comparing its predictions to results obtained by solving the Liouville von Neumann master equation. The use of a Monte Carlo method in our formalism makes it possible to significantly increase the number of spins considered in the model system. We then analyse the dependence of the nuclear bulk polarization on the presence of nuclei in the vicinity of the electron and demonstrate that increasing the minimal distance between nuclei and electrons leads to a rise of the nuclear bulk polarization. These observations have implications for the design of radicals that can lead to impoved values of nuclear spin polarization. Furthermore, we discuss the potential to extend our formalism for more complex spin systems such as cross effect DNP.
description: 10 pages, 13 figures
"Weekend on the town" : patterns and correlates of psychostimulant use among young socialites
Creators: name: Jenkinson., Rebecca Anne
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Role of β-aminoisobutyric acid in relation to insulin sensitivity and cardiometabolic health in adults with obesity
Creators: name: Faiz, Habiba
Publisher: name: No Publisher Supplied
Year: 2023

description: β-aminoisobutyric acid (BAIBA) is a myokine that improves insulin sensitivity, raises fat oxidation, favors glucose homeostasis and lowers inflammation to reduce cardiometabolic risk. BAIBA is reported to be lower in people with obesity. However, there is limited data on whether: a) BAIBA differs in people who have pre-diabetes compared with normal glucose tolerance and b) if BAIBA levels improve by a low calorie diet (LCD) versus LCD plus interval exercise (LCD+INT). PURPOSE: To examine BAIBA in relation to insulin sensitivity and cardiometabolic health before and after lifestyle interventions. METHODS: First, we performed a cross-sectional analysis to compare BAIBA between people with normal glucose tolerance (NGT, N=22, 20F; 48.0±2.4y; 36.9±1.2 kg/m2) and pre-diabetes (PD, n=23 (18 F/ 5 M, 54.2 ± 1.6 yrs, 38.4 ± 1.2 kg/m2). This was followed by a prospective analysis of women with obesity being randomized to LCD (n=12; 48.4 ± 2.5y, 37.8 ± 1.5kg/m2) compared with LCD+INT (n=11; 47.6 ± 4.3y, 37.9 ± 2.3kg/m2) for 2 weeks. In both approaches, we determined BAIBA (mass spectroscopy) in fasting blood as well as examined insulin sensitivity (HOMA-IR, Adipose IR, Matsuda index/SIIS), β-cell function (disposition index (DI) corrected to muscle, liver and/or adipose), glucose tolerance (glucose from a 180 min 75g OGTT), and hepatic insulin clearance (HIC), as well as resting energy expenditure (REE), substrate oxidation (RER, CHOox and Fox), and adipokines (adiponectin and leptin). RESULTS: The results for the cross-sectional analysis indicated no difference in BAIBA among NGT and PD (1.41 ± 0.1 vs. 1.24 ± 0.1uM; P=0.23). However, BAIBA correlated with low plasma insulin (r=-0.391, P=0.03) and blood glucose (r=-0.319, P=0.03) at 180 min of the OGTT. However, improved glucose tolerance was mediated though an adiponectin depedent mechanism (B=-8.78, SE=4.82, 95%CI [-18.57, 1.01], β=-0.28, P=0.077]. For the prospective intervention trial, LCD and LCD+INT increased BAIBA (LCD; 1.50 ± 0.2 vs. 0.97 ± 0.1and LCD+INT; 1.26 ± 0.3 vs. 1.85 ± 0.2uM; P=0.007). Interestingly, BAIBA correlated to lower circulating leptin (r=-0.662, P=0.001), body weight (r=-0.669, P<0.001) and β-cell function (DImuscle; r=-0.45, P=0.03) as well as CHOox tAUC120 (r=-0.44, P=0.03) during the OGTT. CONCULSION: Taken together, BAIBA appears to relate to glycemic control, circulating insulin, pancreatic function and substrate oxidation in adults with obesity. Thus, additional work is required to further understand how BAIBA contributes to lower cardiometabolic disease risk.
Sci-GaIA Deliverable D5.1 - Data Management Plan
Creators: name: Taylor, S J
name: Cornea, A
Publisher: name: Sci-GaIA Open Access Repository
Year: 2015

description: As part of the limited pilot action on open access to research data, Sci-GaIA has implemented a limited pilot action on open access to research data based on the “Guidelines on Data Management in Horizon 2020”. This document specifies the Data Management Plan (DMP) for the project and has created a detailed outline of our policy for data management.
Data Repositories and Science Gateways for Open Science
Creators: name: Barbera, R.
name: Carrubba, C.
name: Inserra, G.
name: Ricceri, R.
name: Torrisi, M.
Publisher: name: Sci-GaIA Open Access Repository
Year: 2015

description: The presentation introduces the concept of Open Science and shows how Open Access Repositories and Science Gateway have been exploited in the context of the Sci-GaIA project to actually implement it. The presentation has been made as part of the program of the UbuntuNet Connect 2015 Conference held in Maputo (Mozambique) on the 19-20 November 2015. For more information about the event, visit http://www.ubuntunet.net/uc2015_cfp.
Mecanobiología y el futuro de los dispositivos médicos
Creators: name: Castillo Merino, Klever Isaac
name: Ojeda, Carlos
Publisher: name: Zenodo
Year: 2023
Subjects: Mechanobiology
Mechanotransduction
Medical Devices
Computational Mechanobiology

description: La mecanobiología es el campo de estudio que abre las puertas a una perspectiva de examinar cómo las fuerzas interactúan con las partes biológicas del cuerpo a nivel celular, tejido y tisular. Además, permite el conocimiento para el desarrollo de nuevos dispositivos médicos, tratamientos de enfermedades e investigaciones en la ciencia de los biomateriales. Para entender la mecanobiología se debe comprender primero la mecanotransducción, proceso de recepción e interpretación de fuerzas mecánicas provenientes del exterior que viajan a través del cuerpo.
An empirical model to form and evolve galaxies in dark matter halos
Creators: name: Li, Shijie
name: Zhang, Youcai
name: Yang, Xiaohu
name: Wang, Huiyuan
name: Tweed, Dylan
name: Liu, Chengze
name: Yang, Lei
name: Shi, Feng
name: Lu, Yi
name: Luo, Wentao
name: Wei, Jianwen
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Based on the star formation histories (SFH) of galaxies in halos of different masses, we develop an empirical model to grow galaxies in dark mattet halos. This model has very few ingredients, any of which can be associated to observational data and thus be efficiently assessed. By applying this model to a very high resolution cosmological $N$-body simulation, we predict a number of galaxy properties that are a very good match to relevant observational data. Namely, for both centrals and satellites, the galaxy stellar mass function (SMF) up to redshift $z\simeq4$ and the conditional stellar mass functions (CSMF) in the local universe are in good agreement with observations. In addition, the 2-point correlation is well predicted in the different stellar mass ranges explored by our model. Furthermore, after applying stellar population synthesis models to our stellar composition as a function of redshift, we find that the luminosity functions in $^{0.1}u$, $^{0.1}g$, $^{0.1}r$, $^{0.1}i$ and $^{0.1}z$ bands agree quite well with the SDSS observational results down to an absolute magnitude at about -17.0. The SDSS conditional luminosity functions (CLF) itself is predicted well. Finally, the cold gas is derived from the star formation rate (SFR) to predict the HI gas mass within each mock galaxy. We find a remarkably good match to observed HI-to-stellar mass ratios. These features ensure that such galaxy/gas catalogs can be used to generate reliable mock redshift surveys.
Ginzburg-Landau theory for skyrmions in inversion-symmetric magnets with competing interactions
Creators: name: Lin, Shi-Zeng
name: Hayami, Satoru
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Magnetic skyrmions have attracted considerable attention recently for their huge potential in spintronic applications. Generally skyrmions are big compared to the atomic lattice constant, which allows for the Ginzburg-Landau type description in the continuum limit. Such a description successfully captures the main experimental observations on skyrmions in B20 compound without inversion symmetry. Skyrmions can also exist in inversion-symmetric magnets with competing interactions. Here we derive a general Ginzburg-Landau theory for skyrmions in these magnets valid in the long wavelength limit. We study the unusual static and dynamical properties of skyrmions based on the derived Ginzburg-Landau theory. We show that an easy axis spin anisotropy is sufficient to stabilize a skyrmion lattice. Interestingly, the skyrmion in inversion-symmetric magnets has a new internal degree of freedom associated with the rotation of helicity, i.e. the "spin" of the skyrmion as a particle, in addition to the usual translational motion of skyrmions (orbital motion). The orbital and spin degree of freedoms of an individual skyrmion can couple to each other, and give rise to unusual behavior that is absent for the skyrmions stabilized by the Dzyaloshinskii-Moriya interaction. The derived Ginzburg-Landau theory provides a convenient and general framework to discuss skyrmion physics and will facilitate the search for skyrmions in inversion-symmetric magnets.
description: 15 pages and 13 figures
[Alpha]-adrenoceptor subtypes in Guinea-pig uterus :
Creators: name: Haynes., John Michael
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Fifty Years of Pulsar Candidate Selection: From simple filters to a new principled real-time classification approach
Creators: name: Lyon, R. J.
name: Stappers, B. W.
name: Cooper, S.
name: Brooke, J. M.
name: Knowles, J. D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Improving survey specifications are causing an exponential rise in pulsar candidate numbers and data volumes. We study the candidate filters used to mitigate these problems during the past fifty years. We find that some existing methods such as applying constraints on the total number of candidates collected per observation, may have detrimental effects on the success of pulsar searches. Those methods immune to such effects are found to be ill-equipped to deal with the problems associated with increasing data volumes and candidate numbers, motivating the development of new approaches. We therefore present a new method designed for on-line operation. It selects promising candidates using a purpose-built tree-based machine learning classifier, the Gaussian Hellinger Very Fast Decision Tree (GH-VFDT), and a new set of features for describing candidates. The features have been chosen so as to i) maximise the separation between candidates arising from noise and those of probable astrophysical origin, and ii) be as survey-independent as possible. Using these features our new approach can process millions of candidates in seconds (~1 million every 15 seconds), with high levels of pulsar recall (90%+). This technique is therefore applicable to the large volumes of data expected to be produced by the Square Kilometre Array (SKA). Use of this approach has assisted in the discovery of 20 new pulsars in data obtained during the LOFAR Tied-Array All-Sky Survey (LOTAAS).
description: Accepted for publication in MNRAS, 20 pages, 8 figures. See http://www.jb.man.ac.uk/pulsar/Surveys.html for survey data, and https://dx.doi.org/10.6084/m9.figshare.3080389.v1 for our data
The Sci-GaIA's vision and implementation of an Open Science Commons Platform for Africa
Creators: name: Barbera, R.
Publisher: name: Sci-GaIA Open Access Repository
Year: 2015

description: The presentation introduces the concepts of Open Science and Open Science Commons and then outlines the Open Science Commons platform conceived and implemented by the Sci-GaIA project. The presentation has been given in the context of the Sci-GaIA Workshop on Open Science held in Maputo (Mozambique) on the 18th of November 2015. For more information about the event, visit http://agenda.ct.infn.it/e/sci-gaia-first-workshop.
Upper bounds on probability thresholds for asymmetric Ramsey properties
Creators: name: Kohayakawa, Yoshiharu
name: Schacht, Mathias
name: Spöhel, Reto
Publisher: name: arXiv
Year: 2016
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C80, 05C55

description: Given two graphs $G$ and $H$, we investigate for which functions $p=p(n)$ the random graph $G_{n,p}$ (the binomial random graph on $n$ vertices with edge probability $p$) satisfies with probability $1-o(1)$ that every red-blue-coloring of its edges contains a red copy of $G$ or a blue copy of $H$. We prove a general upper bound on the threshold for this property under the assumption that the denser of the two graphs satisfies a certain balancedness condition. Our result partially confirms a conjecture by the first author and Kreuter, and together with earlier lower bound results establishes the exact order of magnitude of the threshold for the case in which $G$ and $H$ are complete graphs of arbitrary size. In our proof we present an alternative to the so-called deletion method, which was introduced by Rödl and Ruciński in their study of symmetric Ramsey properties of random graphs (i.e. the case $G=H$), and has been used in many proofs of similar results since then.
Using Clustering Method to Understand Indian Stock Market Volatility
Creators: name: Chaudhuri, Tamal Datta
name: Ghosh, Indranil
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: In this paper we use Clustering Method to understand whether stock market volatility can be predicted at all, and if so, when it can be predicted. The exercise has been performed for the Indian stock market on daily data for two years. For our analysis we map number of clusters against number of variables. We then test for efficiency of clustering. Our contention is that, given a fixed number of variables, one of them being historic volatility of NIFTY returns, if increase in the number of clusters improves clustering efficiency, then volatility cannot be predicted. Volatility then becomes random as, for a given time period, it gets classified in various clusters. On the other hand, if efficiency falls with increase in the number of clusters, then volatility can be predicted as there is some homogeneity in the data. If we fix the number of clusters and then increase the number of variables, this should have some impact on clustering efficiency. Indeed if we can hit upon, in a sense, an optimum number of variables, then if the number of clusters is reasonably small, we can use these variables to predict volatility. The variables that we consider for our study are volatility of NIFTY returns, volatility of gold returns, India VIX, CBOE VIX, volatility of crude oil returns, volatility of DJIA returns, volatility of DAX returns, volatility of Hang Seng returns and volatility of Nikkei returns. We use three clustering algorithms namely Kernel K-Means, Self Organizing Maps and Mixture of Gaussian models and two internal clustering validity measures, Silhouette Index and Dunn Index, to assess the quality of generated clusters.
The Bohr superconductor
Creators: name: Hirsch, J. E.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Superconductors have often been described as `giant atoms'. The simplest description of atoms that heralded their quantum understanding was proposed by Bohr in 1913. The Bohr atom starts from some simple assumptions and deduces that the angular momentum of the electron in Bohr orbits is quantized in integer units of $\hbar$. This remarkable result, which does not appear to be implicit in the assumptions of the model, can be interpreted as a `theoretical proof' of the model's validity to describe physical reality at some level. Similarly we point out here that from some simple assumptions it can be deduced that electrons in superconductors reside in mesoscopic orbits with orbital angular momentum $\hbar/2$. This implies that both in superconductors and in ferromagnets the long-range order results from elementary units of identical angular momentum. Similarly to the case of the Bohr atom we propose that this remarkable result is compelling evidence that this physics, which is not part of conventional BCS theory, describes physical reality at some level and heralds a qualitatively new understanding of superconductors.
The isolation of growth hormone derived polypeptides from human biological fluids and studies on their role in glucose homeostasis
Creators: name: Zimmet., Paul Zev
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
YETI observations of the young transiting planet candidate CVSO 30 b
Creators: name: Raetz, St.
name: Schmidt, T. O. B.
name: Czesla, S.
name: Klocová, T.
name: Holmes, L.
name: Errmann, R.
name: Kitze, M.
name: Fernández, M.
name: Sota, A.
name: Briceño, C.
name: Hernández, J.
name: Downes, J. J.
name: Dimitrov, D. P.
name: Kjurkchieva, D.
name: Radeva, V.
name: Wu, Z. -Y.
name: Zhou, X.
name: Takahashi, H.
name: Henych, T.
name: Seeliger, M.
name: Mugrauer, M.
name: Adam, Ch.
name: Marka, C.
name: Schmidt, J. G.
name: Hohle, M. M.
name: Ginski, Ch.
name: Pribulla, T.
name: Trepl, L.
name: Moualla, M.
name: Pawellek, N.
name: Gelszinnis, J.
name: Buder, S.
name: Masda, S.
name: Maciejewski, G.
name: Neuhäuser, R.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: CVSO 30 is a unique young low-mass system, because, for the first time, a close-in transiting and a wide directly imaged planet candidates are found around a common host star. The inner companion, CVSO 30 b, is the first possible young transiting planet orbiting a previously known weak-lined T-Tauri star. With five telescopes of the 'Young Exoplanet Transit Initiative' (YETI) located in Asia, Europe and South America we monitored CVSO 30 over three years in a total of 144 nights and detected 33 fading events. In two more seasons we carried out follow-up observations with three telescopes. We can confirm that there is a change in the shape of the fading event between different observations and that the fading event even disappears and reappears. A total of 38 fading event light curves were simultaneously modelled. We derived the planetary, stellar, and geometrical properties of the system and found them slightly smaller but in agreement with the values from the discovery paper. The period of the fading event was found to be 1.36 s shorter and 100 times more precise than the previous published value. If CVSO 30 b would be a giant planet on a precessing orbit, which we cannot confirm, yet, the precession period may be shorter than previously thought. But if confirmed as a planet it would be the youngest transiting planet ever detected and will provide important constraints on planet formation and migration time-scales.
description: 14 pages (20 with appendix), 7 figures (16 with appendix), 6 tables (7 with appendix)
A note on quantum groups and integrable systems
Creators: name: Popolitov, Alexander
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Free-field formalism for quantum groups provides a special choice of coordinates on a quantum group. In these coordinates the construction of associated integrable system is especially simple. This choice also fits into general framework of cluster varieties -- natural changes of coordinates are cluster mutations.
description: 3 pages, to appear in JETP Letters
Role of FasL and TNF in cell apoptosis following focal traumatic brain injury
Creators: name: Ziebell., Jenna
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
The Impact of Big Data on Modelling & Simulation: Do We Need to Get Big?
Creators: name: Taylor, Simon J E
Publisher: name: Sci-GaIA Open Access Repository
Year: 2015

description: The presentation outlines the main issues that modelling & simulation needs to address if it is to meet the grand challenges of big data analytics. A Sci-GaIA case study is presented showing how science gateways are a critical building block in meeting this challenge. Keynote Presentation at the 2015 Winter Simulation Conference PhD Colloquium.
Investigation of paralysis in spinal cord injury and motor neuron disease
Creators: name: Da Wei Zang.
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Lattice vibrations of the charge-transfer salt $κ$-(BEDT-TTF)$_2$Cu$_2$(CN)$_{3}$: novel interpretation of the electrodynamic response in a spin-liquid compound
Creators: name: Dressel, M.
name: Lazic, P.
name: Pustogow, A.
name: Zhukova, E.
name: Gorshunov, B.
name: Schlueter, J. A.
name: Milat, O.
name: Gumhalter, B.
name: Tomic, S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The dimer Mott insulator $κ$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$ exhibits unusual electrodynamic properties. Numerical investigations of the electronic ground state and the molecular and lattice vibrations reveal the importance of the Cu$_2$(CN)$_3^-$ anion network coupled to the BEDT-TTF molecules: The threefold cyanide coordination of copper and linkage isomerism in the anion structure cause a loss of symmetry, frustration, disorder, and domain formation. Our findings consistently explain the temperature and polarization-dependent THz and infrared measurements, reinforce the understanding of dielectric properties and have important implications for the quantum spin-liquid state, which should be treated beyond two-dimensional, purely electronic models.
description: 4 pages, 4 figures, Supplement, Movie at http://tp2.irb.hr/web/Fononi_Silvia/ (to be published in Physical Review B)
Coevolution of rostrum and brain in pig species
Creators: name: Ritter, Cindy
name: Eigen, Lennart
name: Deiringer, Nora
name: Laubscher, Liesel
name: Brecht, Michael
Publisher: name: Humboldt-Universität zu Berlin
Year: 2023
Subjects: subject: rostrum
subject: rostrum gyrus
subject: suids
subject: suinae
subject: warthog
subject: 570 Biologie

description: Domestic pigs have a prominent cortical gyrus (the rostrum gyrus) isomorphic to the contralateral hemirostrum. It is unclear, however, if the size and shape of the rostrum gyrus are of evolutionary/functional relevance. Here, we address this question by assessing the relationship of rostrum and rostrum gyrus across eight pig species. To this end, we quantified rostrum morphology in fresh and alcohol-preserved pig specimens by surface scans, microfocus computed tomography scans, and photography. We establish that the size and shape of the rostrum gyrus can be precisely inferred from endocasts. We then took advantage of the accessibility of pig skulls and endocasts to assess features of the rostrum gyrus across species. Our investigation led to the following results: (i) The rostra of pig species show basic similarities. (ii) A cortical rostrum gyrus is apparent in all pigs. (iii) The size of the rostrum gyrus differs across species and outgroups of the evolutionary dominant suinae (i.e., peccaries and the babirusa) have a noticeably smaller rostrum gyrus. (iv) Warthogs have a derived rostrum morphology with an extra fold and a very wide rostrum; the warthog rostrum gyrus recapitulates these rostrum features. (v) Domestic pigs have relatively smaller rostrum gyrus than wild boars. We also provide indications for a conserved cytoarchitectonic patterning of the rostrum gyrus. We conclude that the rostrum gyrus is a neural module that was putatively present in the common ancestor of pigs and that this neural module is conserved across pig species. Natural selection maintains the rostrum gyrus’ size and its exact isomorphism to the rostrum.
Volatile carbon locking and release in protoplanetary disks. A study of TW Hya and HD 100546
Creators: name: Kama, M.
name: Bruderer, S.
name: van Dishoeck, E. F.
name: Hogerheijde, M.
name: Folsom, C. P.
name: Miotello, A.
name: Fedele, D.
name: Belloche, A.
name: Güsten, R.
name: Wyrowski, F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The composition of planetary solids and gases is largely rooted in the processing of volatile elements in protoplanetary disks. To shed light on the key processes, we carry out a comparative analysis of the gas-phase carbon abundance in two systems with a similar age and disk mass, but different central stars: HD 100546 and TW Hya. We combine our recent detections of C$^{0}$ in these disks with observations of other carbon reservoirs (CO, C$^{+}$, C$_{2}$H) and gas mass and warm gas tracers (HD, O$^{0}$), as well as spatially resolved ALMA observations and the spectral energy distribution. The disks are modelled with the DALI 2D physical-chemical code. Stellar abundances for HD 100546 are derived from archival spectra. Upper limits on HD emission from HD 100546 place an upper limit on the total disk mass of $\leq0.1\,M_{\odot}$. The gas-phase carbon abundance in the atmosphere of this warm Herbig disk is at most moderately depleted compared to the interstellar medium, with [C]/[H]$_{\rm gas}=(0.1-1.5)\times 10^{-4}$. HD 100546 itself is a $λ\,$Boötis star, with solar abundances of C and O but a strong depletion of rock-forming elements. In the gas of the T Tauri disk TW Hya, both C and O are strongly underabundant, with [C]/[H]$_{\rm gas}=(0.2-5.0)\times 10^{-6}$ and C/O${>}1$. We discuss evidence that the gas-phase C and O abundances are high in the warm inner regions of both disks. Our analytical model, including vertical mixing and a grain size distribution, reproduces the observed [C]/[H]$_{\rm gas}$ in the outer disk of TW Hya and allows to make predictions for other systems.
description: Accepted for publication in A&A
Epigenetic regulation and male fertility
Creators: name: Zamudio., Natasha M.A.
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Resonance effects in the Raman scattering of mono- and few layers MoSe$_2$
Creators: name: Soubelet, P.
name: Bruchhausen, A. E.
name: Fainstein, A.
name: Nogajewski, K.
name: Faugeras, C.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Using resonant Raman scattering spectroscopy with 25 different laser lines, we describe the Raman scattering spectra of mono- and multi-layers 2H-molybdenum diselenide (MoSe$_2$) as well as the different resonances affecting the most pronounced features. For high-energy phonons, both A- and E- symmetry type phonons present resonances with A and B excitons of MoSe$_2$ together with a marked increase of intensity when exciting at higher energy, close to the C exciton energy. We observe symmetry dependent exciton-phonon coupling affecting mainly the low-energy rigid layer phonon modes. The shear mode for multilayer displays a pronounced resonance with the C exciton while the breathing mode has an intensity that grows with the excitation laser energy, indicating a resonance with electronic excitations at energies higher than that of the C exciton.
description: 9 Figures, 9 pages
Chemical assembly of atomically thin transistors and circuits in a large scale
Creators: name: Zhao, Mervin
name: Ye, Yu
name: Han, Yimo
name: Xia, Yang
name: Zhu, Hanyu
name: Wang, Yuan
name: Muller, David A.
name: Zhang, Xiang
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Next-generation electronics calls for new materials beyond silicon for increased functionality, performance, and scaling in integrated circuits. Carbon nanotubes and semiconductor nanowires are at the forefront of these materials, but have challenges due to the complex fabrication techniques required for large-scale applications. Two-dimensional (2D) gapless graphene and semiconducting transition metal dichalcogenides (TMDCs) have emerged as promising electronic materials due to their atomic thickness, chemical stability and scalability. Difficulties in the assembly of 2D electronic structures arise in the precise spatial control over the metallic and semiconducting atomic thin films. Ultimately, this impedes the maturity of integrating atomic elements in modern electronics. Here, we report the large-scale spatially controlled synthesis of the single-layer semiconductor molybdenum disulfide (MoS2) laterally in contact with conductive graphene. Transition electron microscope (TEM) studies reveal that the single-layer MoS2 nucleates at the edge of the graphene, creating a lateral 2D heterostructure. We demonstrate such chemically assembled 2D atomic transistors exhibit high transconductance (10 uS), on-off ratios (10^6), and mobility (20 cm^2 V^-1 s^-1). We assemble 2D logic circuits, such as a heterostructure NMOS inverter with a high voltage gain, up to 70, enabled by the precise site selectivity from atomically thin conducting and semiconducting crystals. This scalable chemical assembly of 2D heterostructures may usher in a new era in two-dimensional electronic circuitry and computing.