cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Producing flow in "racetrack" atom circuits by stirring at zero and non-zero temperature
Creators: name: Eller, Benjamin
name: Oladehin, Olatunde
name: Fogarty, Daniel
name: Heller, Clayton
name: Clark, Charles W.
name: Edwards, Mark
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a study of how macroscopic flow can be produced in Bose-Einstein condensate confined in a "racetrack" potential by stirring with a wide rectangular barrier. This potential consists of two half-circle channels separated by straight channels of length $L$ and is a ring potential if $L=0$. We present the results of a large set of simulations where racetrack condensates stirred with a barrier under varying conditions of barrier height, stir speed, racetrack geometry, and temperature. We found that stirring was readily able to produce circulation in ring and non-ring geometries but that the exact amount of flow produced was complicated. We therefore also studied the mechanism by which flow was produced in the stirring process. We found that circulation was induced by the swap of a vortex/anti-vortex pair that was initially created by backflow of the condensate in the region of depressed density by the barrier. When the barrier strength reached a critical value a number of these vortex-swap events occurred in rapid succession so that flow speed of the circulation produced was enough to exceed the stir speed of the barrier. Flow that was initially localized in the vortices involved in the vortex swap was converted into macroscopic flow around the racetrack by pairs of disturbances each generated during the vortex swap. Each pair consisted of a vortex/anti-vortex pair moving in the anti-stir direction and a compression wave moving in the stir direction. This picture of the mechanism for making flow will enable the design of stirring schedules that create a desired amount of flow.
description: 13 pages, 9 figures
Big Metadata: Bringing researchers CLOSER to longitudinal data with an Advanced Discovery Platform
Creators: name: Iverson, Jeremy
Publisher: name: Zenodo
Year: 2015

description: CLOSER (www.closer.ac.uk), funded by the ESRC and MRC, aims to maximise the use, value and impact of nine of the UK's longitudinal studies. A central component of CLOSER will be a metadata discovery platform that will enable the discovery of a range of data collection and variable metadata from each of the participating studies. The scale and detail of the metadata to be included will make it amongst the largest and most detailed of such repositories in the world. The discovery platform - nbsp;a customisation of the Colectica search portalnbsp; - will offer cutting-edge search technologies and innovative and user-friendly ways to discover, navigate and display the metadata. This presentation will describe how the metadata were created and harmonized, discuss how the search portal was built, and showcase the innovative search and discovery interfaces that are critical to allowing researchers to understand and leverage a massive data resource.
Supplementary Information from A developmentally descriptive method for quantifying shape in gastropod shells
Creators: name: J. Larsson
name: A. M. Westram
name: S. Bengmark
name: T. Lundh
name: R. K. Butlin
Publisher: name: The Royal Society
Year: 2020
Subjects: subject: 10202 Biological Mathematics
subject: FOS: Mathematics

description: The growth of snail shells can be described by simple mathematical rules. Variation in a few parameters can explain much of the diversity of shell shapes seen in nature. However, empirical studies of gastropod shell shape variation typically use geometric morphometric approaches, which do not capture this growth pattern. We have developed a way to infer a set of developmentally descriptive shape parameters based on three-dimensional logarithmic helicospiral growth and using landmarks from two-dimensional shell images as input. We demonstrate the utility of this approach, and compare it to the geometric morphometric approach, using a large set of Littorina saxatilis shells in which locally adapted populations differ in shape. Our method can be modified easily to make it applicable to a wide range of shell forms, which would allow for investigations of the similarities and differences between and within many different species of gastropods.
Charmless Two-body Baryonic B Decays
Creators: name: Chua, Chun-Khiang
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study charmless two-body baryonic B decays in a diagramatic approach. Relations on decay amplitudes are obtained. In general there are more than one tree and more than one penguin amplitudes. The number of independent amplitudes can be reduced in the large m_B limit. It leads to more predictive results. Some prominent modes for experimental searches are pointed out.
description: 15 pages, 2 figures. To appear in Phys. Rev. D
Doing DDI: Operationalising DDI for longitudinal studies
Creators: name: Seabrook, Gemma
Publisher: name: Zenodo
Year: 2015

description: Funders are rightly concerned that they get the maximum value for their investments. The UK longitudinal studies represent a unique data collection that continues to give value and it is important to ensure that this collection remains relevant. Providing the quality of documentation that modern researchers expect for studies that begin as early as 1946 provides a significant challenge. The CLOSER project brings together nine of these studies. It seeks to enhance the metadata available to provide complete questionnaire and variable metadata that can support ongoing data management and be used to populate a search platform, enabling discovery in general and cross-cohort research in particular. Bringing historic metadata up to the DDI standard being adopted presents a variety of challenges such as the condition of supporting documentation for the oldest parts of the studies, the wide variety of methods and formats, the sheer scale of the number of questionnaires and tools used and the priorities and capacity of the various stakeholders. This paper will detail how CLOSER has addressed these at an operational level (protocols, processes, planning, etc.) and how others might learn from these experiences and make use of the outputs CLOSER provides.
Update on Taxonomy / Lexicon Project at the US Bureau of Labor Statistics
Creators: name: Gillman, Daniel
Publisher: name: Zenodo
Year: 2015

description: The taxonomy and lexicon project at the US Bureau of Labor Statistics was started in summer 2013 with the goal to provide consistent access to BLS data and documents. Each search criterion should provide data and documents that are related. The taxonomy portion of the work is to improve searching for data, and the lexicon portion is to improve tagging, cataloging, and searching for documents. The work has advanced significantly since it was initially described at IASSIST 2014. There are 5 areas of note: 1) The development of a 3 level hierarchy over all the measures and characteristics encompassing BLS data 2) Linkage of all low level characteristics across measures 3) The identification of common confusions and plain language similarities for all BLS data 4) Cognitive evaluations of the 3 level hierarchies 5) The development of a web-based implementation of the taxonomy 6) The inclusion of the taxonomy into the new DataFinder series dissemination tool 7) Assessment of the impact on standardizing all BLS terms Each of these developments will be discussed in more detail, and in particular the impact of each is described.
Publishing codebooks via CED2AR to enable variable cross-searching between datasets
Creators: name: Heslop, Janet
name: Perry, Ben
Publisher: name: Zenodo
Year: 2015

description: The Comprehensive Extensible Data Documentation and Access Repository (CED2AR) is designed to improve the discoverability of data collections based upon codebooks and metadata of the holdings. CED2AR utilizes DDI 2.5 metadata standards for documenting the holdings, along with schema.org for microdata markup to allow search engines to parse the semantic information from the DDI metadata. This combined solution enhances the discoverability of DDI metadata and displays it through a user friendly web interface. In addition to making individual codebooks searchable, CED2AR also facilitates cross-codebook searching and browsing. Based on the CED2AR application the Cornell Institute of Social and Economic Research (CISER) is currently in the midst of bringing our data archive metadata into DDI 2.5 through the CED2AR application. The presentation will describe the steps taken to accomplish this task and a demonstration on the status of producing an extensible data archive down to the variable level.
Thermodynamic and transport properties of RAgGe (R=Tb-Lu) single crystals
Creators: name: Morosan, E.
name: Bud'ko, S. L.
name: Canfield, P. C.
name: Torikachvili, M. S.
name: Lacerda, A. H.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Single crystals of the title compounds were grown out of an AgGe-rich ternary solution. Powder x-ray diffraction data confirmed the hexagonal AlNiZr-type structure ($P\bar{6}2m$ space group), an ordered variant of the Fe$_2$P structure type. Antiferromagnetic ordering can be inferred from magnetization, resistance and specific heat measurements, with values of T$_N$ between 28.5 K for TbAgGe, and 1.0 K for YbAgGe, which scale roughly with the de Gennes factor. Anisotropic $M(H)$ measurements indicate one or more metamagnetic transitions when the external field is applied along the c-axis (for R=Tb) or perpendicular to it (R = Ho, Er, Tm), or even in both orientations as in the case of DyAgGe. Furthermore, the extreme anisotropy of the magnetization in TmAgGe, where magnetic moments lie in the $ab$-plane, provides the possibility of studying the angular dependence of metamagnetism in hexagonal compounds with the rare earth in orthorhombic point symmetry. YbAgGe has distinct properties from the rest of the series: an enhanced electronic specific heat coefficient ($γ\approx$(154.2$\pm$2.5)mJ/mol*K$^2$), and apparently small moment magnetic ordering below 1.0 K. This compound appears to be close to a quantum critical point.
title: Hybrid Statics
Creators: name: Baumann, Andreas
Publisher: name: TU Wien
Year: 2021
Subjects: subject: Membrane structure
subject: Hybrid calculation
subject: Hypar
subject: Arched frame
subject: Defelction

description: Lightweight structures as they are today not only need good inspiration, but also good engineering using sophisticated technologies. This thesis should give an insight into the differences that arise when calculating lightweight structures hybrid in holistic models on one hand or separate on the other. In the best case, this work allows the reader to develop a sense of what the differences are between the two opposing approaches when working on a particular project. It certainly cannot feel as good as collecting own experiences when making personal comparisons in special cases, but it should give an overview. Evaluations, graphs and visualisations provide insight into what it means to pursue the one way or the other, where the possibilities are, but also the risks that may arise. Basic principles are presented and the topic is examined in practice on the basis of a specific practical project. A feeling should be delivered to the reader for when the consequences of the design of a structure is not that immense when calculating conventional, and when hybrid calculation is essential.In the context of this thesis by hybrid is meant having a structure consisting of different types of structural behaviour. In this case, on one hand having lightweight components such as membranes, meshes, cushions, cable nets, etc., which can only take tensile forces, and on the other hand a supporting structure which can take further internal forces like compression and bending. Calculating separate means that lightweight components like membranes are calculated stand-alone in one model without the supporting structure. Afterwards the support forces from the lightweight calculation model are – better or worse – applied to the model of the pure supporting structure, dimensioning this then. In the hybrid approach the overall model is calculated and dimensioned in one holistic model.Since the possibilities of hybrid calculation given today with the software available on the market, hybrid calculation has already become relatively unproblematic. Nevertheless, very often and not to say mostly according to the authors' experience, the hybrid calculation is not used resulting in a series of bad consequences.The differences between the two approaches should be considered. What are the engineering implications? What are the cost impacts? What are the safety issues? What impact do the differences have on possible designs when following the one strategy or the other? As this thesis should be less theoretical than practice-oriented, it also examines the impact on companies operating in the market pursuing the different strategies. In particular, the negation of the hybrid approach can be decisive to win or lose projects in the global competitive market.
Reinforcement Learning Based Vehicle-cell Association Algorithm for Highly Mobile Millimeter Wave Communication
Creators: name: Khan, Hamza
name: Elgabli, Anis
name: Samarakoon, Sumudu
name: Bennis, Mehdi
name: Hong, Choong Seon
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Vehicle-to-everything (V2X) communication is a growing area of communication with a variety of use cases. This paper investigates the problem of vehicle-cell association in millimeter wave (mmWave) communication networks. The aim is to maximize the time average rate per vehicular user (VUE) while ensuring a target minimum rate for all VUEs with low signaling overhead. We first formulate the user (vehicle) association problem as a discrete non-convex optimization problem. Then, by leveraging tools from machine learning, specifically distributed deep reinforcement learning (DDRL) and the asynchronous actor critic algorithm (A3C), we propose a low complexity algorithm that approximates the solution of the proposed optimization problem. The proposed DDRL-based algorithm endows every road side unit (RSU) with a local RL agent that selects a local action based on the observed input state. Actions of different RSUs are forwarded to a central entity, that computes a global reward which is then fed back to RSUs. It is shown that each independently trained RL performs the vehicle-RSU association action with low control overhead and less computational complexity compared to running an online complex algorithm to solve the non-convex optimization problem. Finally, simulation results show that the proposed solution achieves up to 15\% gains in terms of sum rate and 20\% reduction in VUE outages compared to several baseline designs.
description: 13 pages, 14 figures
Understanding academic users' data needs through Virtual Reference transcripts
Creators: name: Smith, Margaret
name: Guss, Samantha
name: Conte, Jill
Publisher: name: Zenodo
Year: 2015

description: New York University Libraries has a very high volume chat reference service--averaging more than 14,500 transactions per academic year for the past few years. This popularity offers a unique opportunity for insight into our patrons' conceptualization of their data needs and how these needs are changing. Through analysis of four years worth of chat transcripts, we assessed user needs and familiarity related to locating secondary data and statistics, performing data analysis, and using existing data services. We used a grounded theory approach, exploring the data through coding and categorization. We will discuss the process and results of our investigation, as well as implications for training virtual reference service staff on the data reference interview and other data topics, and improving overall service quality.
Advanced Detection of Source Code Clones via an Ensemble of Unsupervised Similarity Measures
Creators: name: Martinez-Gil, Jorge
Publisher: name: arXiv
Year: 2024
Subjects: subject: Software Engineering (cs.SE)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The capability of accurately determining code similarity is crucial in many tasks related to software development. For example, it might be essential to identify code duplicates for performing software maintenance. This research introduces a novel ensemble learning approach for code similarity assessment, combining the strengths of multiple unsupervised similarity measures. The key idea is that the strengths of a diverse set of similarity measures can complement each other and mitigate individual weaknesses, leading to improved performance. Preliminary results show that while Transformers-based CodeBERT and its variant GraphCodeBERT are undoubtedly the best option in the presence of abundant training data, in the case of specific small datasets (up to 500 samples), our ensemble achieves similar results, without prejudice to the interpretability of the resulting solution, and with a much lower associated carbon footprint due to training. The source code of this novel approach can be downloaded from https://github.com/jorge-martinez-gil/ensemble-codesim.
description: Under review in Software Quality Days
Neutrino Oscillations for Dummies
Creators: name: Waltham, Chris
Publisher: name: arXiv
Year: 2003
Subjects: subject: Physics Education (physics.ed-ph)
subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: The reality of neutrino oscillations has not really sunk in yet. The phenomenon presents us with purely quantum mechanical effects over macroscopic time and distance scales (milliseconds and 1000s of km). In order to help with the pedagogical difficulties this poses, I attempt here to present the physics in words and pictures rather than math. No disrespect is implied by the title; I am merely borrowing a term used by a popular series of self-help books.
Painted objects : investigating the imagery of Australian iconic culture
Creators: name: Lahy, Waratah
Publisher: name: The Australian National University
Year: 2007
Subjects: subject: N7400.6.L34 2007
subject: Morgan, Glenn Criticism and interpretation
subject: McKenna, Noel, 1956- Criticism and interpretation
subject: Artists Australia
subject: Art, Australian 21st century
subject: Art, Australian 20th century
subject: Art, Modern 21st century Australia
subject: Art, Modern 20th century Australia
subject: Art, Modern Exhibitions21st century Australia

description: [v.1]. Dissertation --[v.2]. Studio report
Geometry of good sets in n-fold Cartesian product
Creators: name: Klopotowski, A
name: Nadkarni, M G
name: Rao, K P S Bhaskara
Publisher: name: arXiv
Year: 2004
Subjects: subject: Combinatorics (math.CO)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 60A05, 47A35, 28D05, 37Axx

description: We propose here a multidimensional generalisation of the notion of link introduced in our previous papers and we discuss some consequences for simplicial measures and sums of function algebras.
description: 17 pages, no figures, no tables
Was it good for you? User Experience Research to improve dissemination of census aggregate data via InFuse
Creators: name: Wiseman, Richard
Publisher: name: Zenodo
Year: 2015

description: InFuse (infuse.mimas.ac.uk) provides easy access to aggregate data from the UK's 2011 and 2011 censuses based on a fundamental remodelling of the thousands of disparate aggregate datasets produced by the three UK census agencies into a single, integrated, standards-compliant dataset suitable for global and automated operations. To date, efforts have mainly been focussed on the enormous task of data processing. This presentation will outline the next phase of development aimed at enhancing users' experiences of InFuse. It will include details of user experience research already carried out, and the ways in which results have guided current development, as well as describing future plans, challenges and opportunities.
Computational aberration correction in spatiotemporal optical coherence (STOC) imaging
Creators: name: Borycki, Dawid
name: Auksorius, Egidijus
name: Węgrzyn, Piotr
name: Wojtkowski, Maciej
Publisher: name: arXiv
Year: 2019
Subjects: subject: Optics (physics.optics)
subject: Image and Video Processing (eess.IV)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Spatiotemporal optical coherence (STOC) imaging is a new technique for suppressing coherent crosstalk noise in Fourier-domain full-field optical coherence tomography (FD-FF-OCT). In STOC imaging, the timevarying inhomogeneous phase masks modulate the incident light to alter the interferometric signal. Resulting interference images are then processed as in standard FD-FF-OCT and averaged incoherently or coherently to produce crosstalk-free volumetric OCT images of the sample. Here, we show that coherent averaging is suitable when phase modulation is performed for both interferometer arms simultaneously. We explain the advantages of coherent over incoherent averaging. Specifically, we show that modulated signal, after coherent averaging, preserves lateral phase stability. This enables computational phase correction to compensate for geometrical aberrations. Ultimately, we employ it to correct for aberrations present in the image of the photoreceptor layer of the human retina that reveals otherwise invisible photoreceptor mosaic.
description: 4 pages, 5 figures
Disorder and magnetic transport in tilted Weyl semimetals
Creators: name: Wang, Yi-Xiang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the effect of disorder on the Landau levels (LLs) in tilted three dimensional Weyl semimetals (WSMs) when a magnetic field is present. Based on the minimum lattice model and by using the exact diagonalization and Kubo's formula, we numerically calculate the Hall conductivity and the density of states (DOS), from which several striking signatures are found to distinguish type-I WSMs from type-II WSMs: the first is the response of the Hall conductivity to the Fermi energy around the band center in clean limit, the second is the performance of the Hall conductivity to disorder, where in type-I WSMs, the robustness of the low-energy LLs is broken successively from the higher LLs to the lower ones and can be understood with the sink down picture, and the third is the behavior of the DOS at zero energy to disorder. The implications of our results are discussed.
description: 7 pages, 6 figures
Exploring flavor structure of supersymmetry breaking from rare B decays and unitarity triangle
Creators: name: Goto, Toru
name: Okada, Yasuhiro
name: Shimizu, Yasuhiro
name: Shindou, Tetsuo
name: Tanaka, Minoru
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study effects of supersymmetric particles in various rare B decay processes as well as in the unitarity triangle analysis. We consider three different supersymmetric models, the minimal supergravity, SU(5) SUSY GUT with right-handed neutrinos, and the minimal supersymmetric standard model with U(2) flavor symmetry. In the SU(5) SUSY GUT with right-handed neutrinos, we consider two cases of the mass matrix of the right-handed neutrinos. We calculate direct and mixing-induced CP asymmetries in the b to s gamma decay and CP asymmetry in B_d to phi K_S as well as the B_s--anti-B_s mixing amplitude for the unitarity triangle analysis in these models. We show that large deviations are possible for the SU(5) SUSY GUT and the U(2) model. The pattern and correlations of deviations from the standard model will be useful to discriminate the different SUSY models in future B experiments.
description: revtex4, 36 pages, 10 figures
Energy Transition in South Africa using a linked energy-economic model
Creators: name: Merven, Bruno
name: Faaiqa Hartley
name: Burton, Jesse
name: Schers, Jules
Publisher: name: University of Cape Town
Year: 2020
Subjects: subject: Uncategorized
subject: 90608 Renewable Power and Energy Systems Engineering (excl. Solar Cells)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper an improved energy-economic model is used to analyse the transition away from coal and toward renewable energy in South Africa. The model enhancements presented in this paper allow for a more accurate assessment of changing coal costs on potential energy and emissions pathways for South Africa. The better representation of the coal sector provides insights on the timing and magnitude of coal mine and power plant retirements, which are a crucial part of information in developing policies required to ameliorate any negative impacts resulting from the energy transition.These negative impacts currently form a social obstacle to change in energy policy. To illustrate the model advances two potential power generation pathways for South Africa are compared: a least-cost energy mix which does not include new coal power plants; and one where renewable capacity in the power sector is constrained, resulting in ~25GW new coal-fired power plant capacity. A comparison of these scenarios shows that, with rising coal costs and lower coal export demand, persisting with coal-based power generation does not “save jobs” in South Africa at the aggregate level, as higher powerinvestment is required in the constrained scenario. This, combined with the higher electricity price experienced in the constrained scenario, negatively affects the rest of the economy, offsetting any positive gains from continued coal-based power generation.
Effects of Triaxiality on the Statistics of Large-Separation Gravitational Lenses
Creators: name: Oguri, Masamune
name: Keeton, Charles R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the statistics of large-separation gravitational lens systems produced by non-spherical halos in the Cold Dark Matter (CDM) model. Specifically, we examine how the triaxiality of CDM halos affects the overall lensing probabilities and the relative numbers of different image configurations (double, quadruple, and naked cusp lenses). We find that triaxiality significantly enhances lensing probabilities by a factor of ~2-4, so it cannot be ignored. If CDM halos have central density slopes alpha~20%) of large-separation lenses should have naked cusp image configurations; this contrasts with lensing by isothermal (α~2) galaxies where naked cusp configurations are rare. The image multiplicities depend strongly on the inner density slope α: for α=1, the naked cusp fraction is >~60%; while for α=1.5, quadruple lenses are actually the most probable. Thus, the image multiplicities in large-separation lenses offer a simple new probe of the inner density profiles of dark matter halos. We also compute the expected probabilities and image multiplicities for lensed quasars in the Sloan Digital Sky Survey, and argue that the recent discovery of the large-separation quadruple lens SDSS J1004+4112 is consistent with expectations for CDM.
description: 10 pages, 10 figures, using emulateapj.cls, accepted for publication in ApJ
ORGANIK VA MINERAL O'G'ITLARNI QISHLOQ XO'JALIGIDA  QO'LLASH TIZIMI
Creators: name: Hayitov Bobur Komilovich Qarshi davlat texnika universiteti katta o'qituvchisi
Publisher: name: Zenodo
Year: 2025

description: Maqolada o‘g‘itlarning qishloq xo‘jaligidagi ahamiyati, o‘g‘itlash tizimining maqsadi va vazifalari yoritilgan. O‘g‘it qo‘llashning turlari, usullari, muddatlari va texnikasi haqida so‘z boradi. Ma’lumotlarda o‘g‘itlarning klassifikatsiyasi ham keltirilgan.

Kalit so‘zlar: o‘g‘itlar, qishloq xo‘jaligi, o‘g‘itlash tizimi, o‘g‘it qo‘llashning turlari, o‘g‘it qo‘llashning usullari, o‘g‘itlarning klassifikatsiyasi
Kernel methods on riemannian manifolds
Creators: name: Hirimbura Matara Kankanamge, Gayan Sadeep Jayasuman
Publisher: name: The Australian National University
Year: 2014

description: Several branches of modern computer vision research make heavy use of machine learning techniques. Machine learning for computer vision generally deals with Euclidean data. However, with the advances in the field, mathematical objects lying in non-Euclidean spaces that can be naturally modeled as Riemannian manifolds are now commonly encountered in computer vision. Therefore, machine learning methods on Riemannian manifolds has become an interesting area of computer vision research. Many Euclidean machine learning methods cannot be directly utilized on data lying in a Riemannian manifold. Generalizing Euclidean methods to Riemannian manifolds is not straightforward either due to differences in geometries. This thesis targets at solving this problem of learning on manifold-valued data, by performing kernel methods on Riemannian manifolds. More specifically, we aim to introduce a superior class of learning algorithms on manifold-valued data by proposing positive definite kernels on Riemannian manifolds and by designing improved kernel learning algorithms on them. We work on a number of Riemannian manifolds encountered in computer vision research, namely, the unit n-sphere, the Riemannian manifold of symmetric positive definite matrices, the Grassmann manifold and the shape manifold. A key component in kernel methods is the positive definite kernel employed. In the earlier chapters of the thesis we introduce positive definite kernels on these manifolds while giving rigorous proofs for their positive definiteness. Being able to define positive definite kernels on these manifolds enables us to use powerful Euclidean algorithms such as support vector machines and principle component analysis on manifold-valued data. This approach significantly reduces the complexities associated with learning on manifold-valued data while simultaneously yielding much better results. In the later chapters, we tackle a more advanced problem: automatically learning the optimal kernel on a manifold for a given computer vision task. The ability to learn the optimal kernel automatically eliminates the need to manually select kernels and the risk of using a sub-optimal kernel, which can significantly degrade the performance of kernel methods. We demonstrate applications of our algorithms on a variety of computer vision tasks such as pedestrian detection, object recognition, image-set recognition, segmentation, clustering, shape recognition and shape retrieval. Experimental evaluations towards the end of each chapter provide evidence that using kernel methods on manifolds achieves superior performance compared to state-of-the-art learning methods on manifold-valued data.
A contractible Levi-flat hypersurface in C^2 which is a determining set for pluriharmonic functions
Creators: name: Forstneric, Franc
Publisher: name: arXiv
Year: 2004
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: Primary 32V05, 32V25; secondary 57R30

description: We construct a real analytic Levi-flat hypersurface M in a neighborhood of an ellipsoid B in C^2 such that the each leaf of the Levi foliation of M is a complex disc, M intersects the boundary of B transversely, and the intersection A of M with B has the following properties: (i) the closure of A is diffeomorphic to the ball in R^3 and has a basis of Stein neighborhoods in C^2, (ii) any real analytic function on A which is constant on each Levi leaf is constant, (iii) any pluriharmonic function in a connected open neighborhood of A and vanishing on A is identically zero.
description: Arkiv Math., to appear
Listening to the user-voice to improve user support and training
Creators: name: King-Hele, Sarah
name: Higgins, Vanessa
Publisher: name: Zenodo
Year: 2015

description: The UK Data Service is a resource funded to support researchers, students, lecturers and policymakers who depend on high-quality social and economic data. This presentation will discuss the methods we use to consult with users and track their behaviour on the website in order to improve our services to them. Our approaches include an annual stakeholder consultation, a continuous pop-up survey on the website, ad-hoc consultations with specific user groups, regular user-testing of the website, monitoring of Google Analytics, user conferences and monitoring of feedback and attendance figures from training events. These developments allow the "user-voice" to come through loud and clear in a variety of formats in listening to the user voice we are able to deliver an improved and targeted service. We also discuss future plans to reach new audiences, including expanding our use of data visualisation and a new dissertation zone.
Doubly periodic solutions of the focusing nonlinear Schrödinger equation: recurrence, period doubling and amplification outside the conventional modulation instability band
Creators: name: Conforti, Matteo
name: Mussot, Arnaud
name: Kudlinski, Alexandre
name: Trillo, Stefano
name: Akhmediev, Nail
Publisher: name: arXiv
Year: 2019
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Solitons on a finite a background, also called breathers, are solutions of the focusing nonlinear Schrödinger equation, which play a pivotal role in the description of rogue waves and modulation instability. The breather family includes Akhmediev breathers (AB), Kuznetsov-Ma (KM), and Peregrine solitons (PS), which have been successfully exploited to describe several physical effects. These families of solutions are actually only particular cases of a more general three-parameter class of solutions originally derived by Akhmediev, Eleonskii and Kulagin [Theor. Math. Phys. {\bf 72}, 809--818 (1987)]. Having more parameters to vary, this significantly wider family has a potential to describe many more physical effects of practical interest than its subsets mentioned above. The complexity of this class of solutions prevented researchers to study them deeply. In this paper, we overcome this difficulty and report several new effects that follow from more detailed analysis. Namely, we present the doubly periodic solutions and their Fourier expansions. In particular, we outline some striking properties of these solutions. Among the new effects, we mention (a) regular and shifted recurrence, (b) period doubling and (c) amplification of small periodic perturbations with frequencies outside the conventional modulation instability gain band.
Probing the Cosmic Reionization History and Local Environment of Gamma-Ray Bursts through Radio Dispersion
Creators: name: Inoue, Susumu
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss the effect of dispersion delay due to intervening ionized media in the radio emission of gamma-ray bursts (GRBs). For high redshift GRBs ($z \ga 3$), the ionized intergalactic medium (IGM) should be the dominant source of dispersion without substantial local or foreground contamination, offering a unique probe of the cosmic reionization epoch through measures of the free electron column density out to different redshifts. The delay times from $z \sim 10$ can be $\sim$ 1 hour at 100 MHz and $\sim$ 10 hours at 30 MHz. On the other hand, dispersion by local ionized material may be important for GRBs at lower redshifts if they occur inside or behind dense molecular clouds, providing clues to the GRB environment; free-free absorption may also be significant in this case. Detecting dispersion delay in the known radio afterglow emission should be extremely challenging due to the low fluxes at the relevant frequencies, but may be marginally possible for rare, bright afterglows by the {\it Square Kilometer Array}. If GRBs also emit prompt, coherent radio emission as predicted by Sagiv & Waxman (2002), the observational prospects can be much better; detection of a sufficient sample of high $z$ GRBs by the {\it Low Frequency Array} may allow a discrimination of different reionization histories. Interesting constraints on the low redshift, warm-hot IGM may also be obtainable through dispersion.
description: Accepted by MNRAS, 11 pages, 6 figures; reference added
The C parameter distribution in e+e- annihilation
Creators: name: Gardi, Einan
name: Magnea, Lorenzo
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study perturbative and non-perturbative aspects of the distribution of the C parameter in e+e- annihilation using renormalon techniques. We perform an exact calculation of the characteristic function, corresponding to the C parameter differential cross section for a single off-shell gluon. We then concentrate on the two-jet region, derive the Borel representation of the Sudakov exponent in the large-beta_0 limit and compare the result to that of the thrust T. Analysing the exponent, we distinguish two ingredients: the jet function, depending on Q^2C, summarizing the effects of collinear radiation, and a function describing soft emission at large angles, with momenta of order QC. The former is the same as for the thrust upon scaling C by 1/6, whereas the latter is different. We verify that the rescaled C distribution coincides with that of 1-T to next-to-leading logarithmic accuracy, as predicted by Catani and Webber, and demonstrate that this relation breaks down beyond this order owing to soft radiation at large angles. The pattern of power corrections is also similar to that of the thrust: corrections appear as odd powers of Lambda/(QC). Based on the size of the renormalon ambiguity, however, the shape function is different: subleading power corrections for the C distribution appear to be significantly smaller than those for the thrust.
description: 24 pages, Latex (using JHEP3.cls), 1 postscript figure
Precision and dissipation of a stochastic Turing pattern
Creators: name: Rana, Shubhashis
name: Barato, Andre C
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Spontaneous pattern formation is a fundamental scientific problem that has received much attention since the seminal theoretical work of Turing on reaction-diffusion systems. In molecular biophysics, this phenomena often takes place under the influence of large fluctuations. It is then natural to inquire about the precision of such pattern. In particular, spontaneous pattern formation is a nonequilibrium phenomenon, and the relation between the precision of a pattern and the thermodynamic cost associated with it remains unexplored. Here, we analyze this relation with a paradigmatic stochastic reaction-diffusion model, the Brusselator in one spatial dimension. We find that the precision of the pattern is maximized for an intermediate thermodynamic cost, i.e., increasing the thermodynamic cost beyond this value makes the pattern less precise. Even though fluctuations get less pronounced with an increase in thermodynamic cost, we argue that larger fluctuations can also have a positive effect on the precision of the pattern.
description: 7 pages, 8 figures
Weber-Fechner's Law and Demand Function
Creators: name: Shigemoto, K.
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We apply the Weber-Fechner's law, which represents the relation between the magnitude of physical stimulus and the magnitude of psychological sense in human being, to the utility function. We conclude that the utility function of n-types of goods is of separable type u(x_1,x_2,..., x_n)=u_1(x_1)+u_2(x_2)+... +u_n(x_n), which give the relation of the demand function in the form p_i=d u_i/d x_i. The explicit quantitative form of each utility function, which is suggested by the Weber-Fechner's law, becomes u_i(x_i)=A_i \log (x_i/x^{(0)}_i). Then we obtain each demand function in the familiar form p_i=A_i/x_i.
description: 6 pages
Entangling the spatial properties of laser beams
Creators: name: Wagner, Katherine Ingrid
Publisher: name: The Australian National University
Year: 2010
Subjects: subject: QC174.17.E58 W34 2010
subject: Quantum entanglement
subject: Einstein-Podolsky-Rosen experiment
subject: Laser beams

description: The use of non-classical states of light, such as squeezed states, have allowed the exploration of quantum mechanical effects that had previously been the subject of speculation only. One of the more interesting aspects of quantum mechanics is when two objects become linked in a process known as quantum entanglement. This property has been the focus of much research due to the potential applications that are expected to emerge from entangled systems. This thesis focuses on the various spatial properties of continuous variable entangled systems, and on simplifying entanglement experiments for a given set of resources. We begin by reviewing the required background quantum optics, and introducing the quantum optics tools that we will be using in the series of experiments. The rest of the thesis details the experiments performed and the implications of the results that were obtained. Firstly, the spatial entanglement experiment is presented. This experiment involved the observation of Einstein-Podolsky-Rosen entanglement for the position and momentum of two laser beams. The position and momentum observables for laser beams manifest themselves as the displacement and tilt of the beams, and entanglement relies on the used of squeezed TEM?? laser modes, mixed with a TEM?? reference mode. The result of the EPR measure for the system was found to be 0.62{u00B1}0.03. The next section deals with a multimode entanglement experiment, where two spatial modes are entangled in a single beam of light. The experiment offers several simplifications upon more standard entanglement layouts, including the use of a single quadrant detector for the measurements, and a single squeezer that was used to produce two independent squeezed spatial modes. The observed Inseparability of the system was found to be 0.79{u00B1}0.02. Lastly, the effect of asymmetries in entangled systems was investigated. The possibility of changing the beamsplitter ratio in biased entanglement experiments in order to improve the measurements made was shown to be a useful approach in some circumstances. An experiment was performed, and showed that by changing the beamsplitter ratio, the value from the EPR criterion can be optimised, and in some cases can show entanglement when it would otherwise not be possible.
Bridging the business data divide: insights into primary and secondary data use by business researchers.
Creators: name: Lowry, Linda
Publisher: name: Zenodo
Year: 2015

description: Academic librarians and data specialists use a variety of approaches to gain insight into how researcher data needs and practices vary by discipline, including surveys, focus groups, and interviews. Some published studies have included small numbers of business school faculty and graduate students in their samples, but provided little, if any, insight into variations within the business discipline. Business researchers employ a variety of research designs and methods and engage in quantitative and qualitative data analysis. The purpose of this paper is to provide deeper insight into primary and secondary data use by business graduate students at one Canadian university based on a content analysis of a corpus of 32 Master of Science in Management theses. This paper explores variations in research designs and data collection methods between and within business subfields (e.g., accounting, finance, operations and information systems, marketing, or organization studies) in order to better understand the extent to which these researchers collect and analyze primary or secondary data sources, including commercial and open data sources. The results of this analysis will inform the work of data specialists and liaison librarians who provide research data management services for business school researchers.
Data Publication: Cost Recovery for Data Centres Interest Group
Creators: name: Dillo, Ingrid
name: Hodson, Simon
Publisher: name: Zenodo
Year: 2015

description: A lot of work is going on to understand the costs of maintaining long-term accessibility to digital resources, to identify different cost components, and on the basis of this to develop cost models. However, in a broader context that considers data as part of research communication, the identification of costs and development of cost models address only part of the problem. In times of tightening budgets, it is important to address the challenge of ensuring the sustainability of data centres -- and to consider this in the context of the broader processes for data publication. Many established national and international data centres have reliable sources of income from research funders. However, these income sources are generally inelastic and may be vulnerable. There is concern that basic funding of data infrastructure may not keep pace with increasing costs. And there is a need, therefore, to consider alternative cost recovery options and a diversification of revenue streams. The RDA/WDS Interest Group on Cost Recovery for Data Centres aims to contribute to strategic thinking on cost recovery by conducting research to understand current and possible cost recovery strategies for data centres. This presentation will provide an overview of the activities of the interest group.
Biosynthesis of the widely distributed hydrocarbon (Z,Z)-6,9-heptadecadiene in astigmatid mites
Creators: name: Moriyama, Daisuke
name: Shimizu, Nobuhiro
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biochemistry
subject: Genetics
subject: FOS: Biological sciences
subject: Neuroscience
subject: Physiology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Inorganic Chemistry
subject: Plant Biology
subject: Computational Biology

description: Using a crude enzyme solution prepared from astigmatid mites, the conversion reaction to (Z,Z)-6,9-heptadecadiene (6,9-C17) using linoleyl aldehyde (LAld) as a substrate was successful. The mass spectrum of the reaction product using 13C-labeled LAld as a substrate could be assigned as 13C-labeled 6,9-C17. Unlike the findings in other species, the decarbonylase derived from mites did not require a coenzyme.