cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Near-Infrared Pyramid Wavefront Sensor for the MMT
Creators: name: Taylor, Jacob
name: Sivanandam, Suresh
name: Anugu, Narsireddy
name: Butko, Adam
name: Chen, Shaojie
name: Durney, Olivier
name: Hardy, Tim
name: Lamb, Masen
name: Montoya, Manny
name: Morzinski, Katie
name: Swanson, Robin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The MMTO Adaptive optics exoPlanet characterization System (MAPS) is an ongoing upgrade to the 6.5-meter MMT Observatory on Mount Hopkins in Arizona. MAPS includes an upgraded adaptive secondary mirror (ASM), upgrades to the ARIES spectrograph, and a new AO system containing both an optical and near-infrared (NIR; 0.9-1.8 um) pyramid wavefront sensor (PyWFS). The NIR PyWFS will utilize an IR-optimized double pyramid coupled with a SAPHIRA detector: a low-read noise electron Avalanche Photodiode (eAPD) array. This NIR PyWFS will improve MAPS's sky coverage by an order of magnitude by allowing redder guide stars (e.g. K & M-dwarfs or highly obscured stars in the Galactic plane) to be used. To date, the custom designed cryogenic SAPHIRA camera has been fully characterized and can reach sub-electron read noise at high avalanche gain. In order to test the performance of the camera in a closed-loop environment prior to delivery to the observatory, an AO testbed was designed and constructed. In addition to testing the SAPHIRA's performance, the testbed will be used to test and further develop the proposed on-sky calibration procedure for MMTO's ASM. We will report on the anticipated performance improvements from our NIR PyWFS, the SAPHIRA's closed-loop performance on our testbed, and the status of our ASM calibration procedure.
description: SPIE Proceedings, Astronomical Telescopes and Instrumentation, July 2022, 10 pages, 8 figures
Carrying the Red Man’s Burden: Pavel Luknitskii, or Kipling in the Soviet Pamir
Creators: name: Colombo, Duccio
Publisher: name: Universita' degli Studi di Salerno
Year: 2018
Subjects: Luknitskii
Kipling
Pamir
Colonialism
Soviet literature

description: Kipling’s work in the Soviet Union was heavily criticized as an expression of imperialism; yet, it was widely read and translated – it was clearly more acceptable than that of Nikolai Gumilev, “the Kipling from Tsarskoe Selo”, a purported counter-revolutionary whose name itself was forbidden. This explains the apparent contradictions in the image of Pavel Luknitskii – from one side, a scholar of Gumilev, from the other, an official Soviet writer. His novel Nisso (1946), based on his travels in the Pamir, is a classic of Soviet literature about the Asian republics. The novel’s plot is built around a classic Colonial triangle, mixed with a typical Soviet collectivization story. The setting purportedly reconstructs the Shugnan region that the author described in his travelogues; many traits in the depiction, however, appear to be highly arguable and expose Luknitskii’s colonialist attitude. The border between Soviet Tajikistan and Afghanistan, carrying the novel’s fundamental symbolic weight, in particular, is nothing but the border between the respective spheres of influence the Russian and the British Empires agreed upon in 1895. The Soviet writers thus needed to construct the Shugnans as a nationality in order to find a place for them inside the Soviet family.
On cohomological decomposition of generalized-complex structures
Creators: name: Angella, Daniele
name: Calamai, Simone
name: Latorre, Adela
Publisher: name: arXiv
Year: 2014
Subjects: subject: Differential Geometry (math.DG)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 32Q60, 53D18, 57T15

description: We study properties concerning decomposition in cohomology by means of generalized-complex structures. This notion includes the $\mathcal{C}^\infty$-pure-and-fullness introduced by Li and Zhang in the complex case and the Hard Lefschetz Condition in the symplectic case. Explicit examples on the moduli space of the Iwasawa manifold are investigated.
Coding theoretic methods for systems with side information
Creators: name: Chen, Yitao
Publisher: name: The University of Texas at Austin
Year: 2020
Subjects: Coding theory
Information theory
Side information
Optimization

description: In real life, many communication system problems have side information due to the broadcasting nature of communication medium. By utilizing the side information, either the communication rate can be increased or the cost of transmission can be decreased. In this proposal, I am going to investigate three problems: index-coded retransmission for OFDMA downlink, decentralized framework for coded caching, and key generation using physically unclonable functions (PUFs). In the first part, we propose a novel index-coded retransmission scheme for OFDMA downlink. In OFDMA downlink, receivers can often decode the other users’ physical layer signals on the other sub-channels, which can be exploited as side information to cancel the interference in subsequent retrans- mission. In contrast to the original index coding formulation, its application to wireless networks has to deal with decoding error probabilities due to channel variations such as fading. We show the tradeoff between the transmission rate gain and the performance of index coding algorithm. We simulate the end to end system with a novel randomized greedy coloring index coding algorithm, and show non-trivial gain with a 100 nodes system. In the second part, we shift to the problem of coded caching: in this case instead of storing a whole file as side information, we can design the cache content to minimize the worst case transmission rate. We propose a novel framework that can translate any centralized coded caching scheme to decentralized scheme without transmission gain loss. We prove the performance of our algorithm is not degraded due to the dynamics introduced by decentralization. In the third part, we present an algebraic binning based coding scheme and its associated achievable rate for key generation using physically unclonable functions is determined. This achievable rate is shown to be optimal under the generated-secret (GS) model for PUFs. Furthermore, a polar code based polynomial-time encoding and decoding scheme that achieves this rate is also presented.
Neutral meson production in pp and Pb-Pb collisions measured by ALICE at the LHC
Creators: name: Marin, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The midrapidity $π^0$ nuclear modification factor, $R_{\rm{AA}}$, at $\sqrt{s_\mathrm{NN}} =$ 2.76 TeV in 6 centrality classes as well as the corresponding $π^0$ invariant yields in Pb-Pb and in pp collisions are presented. The transverse momentum range covered is 0.6 (0.4) GeV/$c$ $< p_{\mathrm{T}}
description: 4 pages, Proceedings of XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2014), May 19-24, 2014, Darmstadt
On the Frequency of Potential Venus Analogs from Kepler Data
Creators: name: Kane, Stephen R.
name: Kopparapu, Ravi Kumar
name: Domagal-Goldman, Shawn D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The field of exoplanetary science has seen a dramatic improvement in sensitivity to terrestrial planets over recent years. Such discoveries have been a key feature of results from the {\it Kepler} mission which utilizes the transit method to determine the size of the planet. These discoveries have resulted in a corresponding interest in the topic of the Habitable Zone (HZ) and the search for potential Earth analogs. Within the Solar System, there is a clear dichotomy between Venus and Earth in terms of atmospheric evolution, likely the result of the large difference ($\sim$ factor of two) in incident flux from the Sun. Since Venus is 95\% of the Earth's radius in size, it is impossible to distinguish between these two planets based only on size. In this paper we discuss planetary insolation in the context of atmospheric erosion and runaway greenhouse limits for planets similar to Venus. We define a ``Venus Zone'' (VZ) in which the planet is more likely to be a Venus analog rather than an Earth analog. We identify 43 potential Venus analogs with an occurrence rate ($η_{\venus}$) of $0.32^{+0.05}_{-0.07}$ and $0.45^{+0.06}_{-0.09}$ for M dwarfs and GK dwarfs respectively.
description: 6 pages, 3 figures, 2 tables. Accepted for publication in the Astrophysical Journal Letters. More information and graphics can be found at the Habitable Zone Gallery (http://hzgallery.org)
Gamma Cas Stars as Be + White Dwarf Binary Systems
Creators: name: Gies, Douglas
name: Wang, Luqian
name: Klement, Robert
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The origin of the bright and hard X-ray emission flux among the gamma Cas subgroup of B-emission line (Be) stars may be caused by gas accretion onto an orbiting white dwarf (WD) companion. Such Be+WD binaries are the predicted outcome of a second stage of mass transfer from a helium star mass donor to a rapidly rotating mass gainer star. The stripped donor stars become small and hot white dwarfs that are extremely faint compared to their Be star companions. Here we discuss model predictions about the physical and orbital properties of Be+WD binaries, and we show that current observational results on gamma Cas systems are consistent with the expected large binary frequency, companion faintness and small mass, and relatively high mass range of the Be star hosts. We determine that the companions are probably not stripped helium stars (hot subdwarf sdO stars), because these are bright enough to detect in ultraviolet spectroscopy, yet their spectroscopic signatures are not observed in studies of gamma Cas binaries. Interferometry of relatively nearby systems provides the means to detect very faint companions including hot subdwarf and cooler main sequence stars. Preliminary observations of five gamma Cas binaries with the CHARA Array interferometer show no evidence of the companion's flux, leaving white dwarfs as the only viable candidates for the companions.
description: 10 pages, 1 figure, ApJL in press
Amplitude Modulation of Cepheid Radial Velocity Curves as a Systematic Source of Uncertainty for Baade-Wesselink Distances
Creators: name: Anderson, Richard I.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: I report on the recent discovery of modulation in the radial velocity curves in four classical Cepheids. This discovery may enable significant improvements in the accuracy of Baade-Wesselink distances by revealing a not previously considered systematic source of uncertainty.
description: 2 pages, 1 figure. Proceedings of IAU Symposium 307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry
The diversity of quasars unified by accretion and orientation
Creators: name: Shen, Yue
name: Ho, Luis C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Quasars are rapidly accreting supermassive black holes at the center of massive galaxies. They display a broad range of properties across all wavelengths, reflecting the diversity in the physical conditions of the regions close to the central engine. These properties, however, are not random, but form well-defined trends. The dominant trend is known as Eigenvector 1, where many properties correlate with the strength of optical iron and [OIII] emission. The main physical driver of Eigenvector 1 has long been suspected to be the quasar luminosity normalized by the mass of the hole (the Eddington ratio), an important quantity of the black hole accretion process. But a definitive proof has been missing. Here we report an analysis of archival data that reveals that Eddington ratio indeed drives Eigenvector 1. We also find that orientation plays a significant role in determining the observed kinematics of the gas, implying a flattened, disklike geometry for the fast-moving clouds close to the hole. Our results show that most of the diversity of quasar phenomenology can be unified with two simple quantities, Eddington ratio and orientation.
description: This is the author's version of the work; 18 pages including Supplementary Information; to appear in the 11 September 2014 issue of Nature at http://dx.doi.org/10.1038/nature13712
Analysis of cellular responses of macrophages to zinc ions and zinc oxide nanoparticles: a combined targeted and proteomic approach
Creators: name: Triboulet, Sarah
name: Aude-Garcia, Catherine
name: Armand, Lucie
name: Gerdil, Adèle
name: Diemer, Hélène
name: Proamer, Fabienne
name: Collin-Faure, Véronique
name: Habert, Aurélie
name: Strub, Jean-Marc
name: Hanau, Daniel
name: Herlin, Nathalie
name: Carrière, Marie
name: Van Dorsselaer, Alain
name: Rabilloud, Thierry
Publisher: name: arXiv
Year: 2014
Subjects: subject: Genomics (q-bio.GN)
subject: FOS: Biological sciences

description: Two different zinc oxide nanoparticles, as well as zinc ions, are used to study the cellular responses of the RAW 264 macrophage cell line. A proteomic screen is used to provide a wide view of the molecular effects of zinc, and the most prominent results are cross-validated by targeted studies. Furthermore, the alteration of important macrophage functions (e.g. phagocytosis) by zinc is also investigated. The intracellular dissolution/uptake of zinc is also studied to further characterize zinc toxicity. Zinc oxide nanoparticles dissolve readily in the cells, leading to high intracellular zinc concentrations, mostly as protein-bound zinc. The proteomic screen reveals a rather weak response in the oxidative stress response pathway, but a strong response both in the central metabolism and in the proteasomal protein degradation pathway. Targeted experiments confirm that carbohydrate catabolism and proteasome are critical determinants of sensitivity to zinc, which also induces DNA damage. Conversely, glutathione levels and phagocytosis appear unaffected at moderately toxic zinc concentrations.
Rotation and the Cepheid Mass Discrepancy
Creators: name: Anderson, Richard I.
name: Ekström, Sylvia
name: Georgy, Cyril
name: Meynet, Georges
name: Mowlavi, Nami
name: Eyer, Laurent
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We recently showed that rotation significantly affects most observable Cepheid quantities, and that rotation, in combination with the evolutionary status of the star, can resolve the long-standing Cepheid mass discrepancy problem. We therefore provide a brief overview of our results regarding the problem of Cepheid masses. We also briefly mention the impact of rotation on the Cepheid period-luminosity(-color) relation, which is crucial for determining extragalactic distances, and thus for calibrating the Hubble constant.
description: 2 pages, 1 figure, Proceedings of IAU Symposium 307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry
Optimization strategies and artefacts of time-involved small angle neutron scattering experiments
Creators: name: Mettus, Denis
name: Chacon, Alfonso
name: Bauer, Andreas
name: Mühlbauer, Sebastian
name: Pfleiderer, Christian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Kinetic small-angle neutron scattering provides access to the microscopic properties of mesoscale systems under slow, periodic perturbations. By interlocking the phases of neutron pulse, sample modulation, and detector signal, so-called Time-Involved Small Angle Neutron scattering Experiments (TISANE) allow to exploit the neutron velocity spread and record data without major sacrifice in intensity at time-scales down to micro-seconds. We review the optimization strategies of TISANE that arise from specific aspects of the process of data acquisition and data analysis starting from the basic principles of operation. Typical artefacts of data recorded in TISANE due to the choice of time-binning and neutron chopper pulse width are illustrated by virtue of the response of the skyrmion lattice in MnSi under periodic changes of the direction of the magnetic field stabilizing the skyrmion lattice.
Data journals: building partnerships between publishers and data centres
Creators: name: Callaghan, Sarah
name: Parton, Graham A
Publisher: name: Zenodo
Year: 2013
Subjects: data and information
data publication
data citation

description: This presentation discusses the work done by CEDA and the other NERC data centres to interact with journal publsihers for data publication.
description: Previously curated at: http://cedadocs.ceda.ac.uk/950/

Event type: workshop.

The publish date on this item was its original published date.

This item was not refereed before the publication

Main files in this record:
NCAS2013_ReasearchForum_7May2013.pdf

Item originally deposited with Centre for Environmental Data Analysis (CEDA) document repository by Dr Sarah Callaghan. Transferred to CEDA document repository community on Zenodo on 2022-11-24
Extended Møller-Plesset perturbation theory for dynamical and static correlations
Creators: name: Tsuchimochi, Takashi
name: Van Voorhis, Troy
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We present a novel method that appropriately handles both dynamical and static electron correlation in a balanced manner, using a perturbation theory on a spin-extended Hartree-Fock (EHF) wave function reference. While EHF is a suitable candidate for degenerate systems where static correlation is ubiquitous, it is known that most of dynamical correlation is neglected in EHF. In this work, we derive a perturbative correction to a fully spin-projected self-consistent wave function based on second-order Møller-Plesset perturbation theory (MP2). The proposed method efficiently captures the ability of EHF to describe static correlation in degeneracy, combined with MP2's ability to treat dynamical correlation effects. We demonstrate drastic improvements on molecular ground state and excited state potential energy curves and singlet-triplet splitting energies over both EHF and MP2 with similar computational effort to the latter.
description: 5 pages, 3 figures, 2 tables
The Human Trafficking Crusade: A Content Analysis of Canadian Newspaper Articles
Creators: name: Fournier, Shannon
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2020
Subjects: Human trafficking
Sex trafficking
Sex work
Sex trade
Prostitution
Media

description: Although human trafficking was not a new concept, it gained increased attention across the United States and Canada in the first two decades of the 21st century. To better understand the Canadian anti-trafficking movement, this thesis analyzed the discourse on the topic in six local and national daily newspapers between 2008 and 2018. The goal of this thesis was to investigate the emergence of human trafficking as a social problem. Using social constructionism as a point of departure, a critical discourse analysis was conducted in NVivo of the quotes made by human trafficking experts in Canadian media. The results of this analysis suggest that an Unofficial Christian Coalition emerged in Canada, which – assisted by the media – led a moral crusade against human trafficking and pushed for the adoption of restrictive sex work legislation in Canada.
Onsite data processing and monitoring for the Daya Bay Experiment
Creators: name: Liu, Ying-Biao
name: He, Miao
name: Liu, Bei-Jiang
name: Wang, Meng
name: Ma, Qiu-Mei
name: Qi, Fa-Zhi
name: Zeng, Shan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The Daya Bay Reactor Neutrino Experiment started running on September 23, 2011. The offline computing environment, consisting of 11 servers at Daya Bay, was built to process onsite data. With current computing ability, onsite data processing is running smoothly. The Performance Quality Monitoring system (PQM) has been developed to monitor the detector performance and data quality. Its main feature is the ability to efficiently process multi-data-stream from three experimental halls. The PQM processes raw data files from the Daya Bay data acquisition system, generates and publishes histograms via a graphical web interface by executing the user-defined algorithm modules, and saves the histograms for permanent storage. The fact that the whole process takes only around 40 minutes makes it valuable for the shift crew to monitor the running status of all the sub-detectors and the data quality.
Mitigation of MHD induced fast-ion redistribution in MAST and implications for MAST-Upgrade design
Creators: name: Keeling, D L
name: Barrett, T R
name: Cecconello, M
name: Challis, C D
name: Hawkes, N
name: Jones, O M
name: Klimek, I
name: McClements, K G
name: Meakins, A
name: Milnes, J
name: Turnyanskiy, M
name: team, MAST
Publisher: name: arXiv
Year: 2014
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The phenomenon of redistribution of neutral beam fast-ions due to MHD activity in plasma has been observed on many tokamaks and more recently has been a focus of research on MAST (Turnyanskiy M. et al, 2011 Nucl. Fusion 53 053016). n=1 fishbone modes are observed to cause a large decrease in the neutron emission rate corresponding to a significant perturbation of the fast-ion population in the plasma. Theoretical work on fishbone modes states that the fast-ion distribution itself acts as the source of free energy driving the modes that cause the redistribution. Therefore a series of experiments have been carried out on MAST to investigate a range of plasma density levels at two neutral beam power levels to determine the region within this parameter space in which MHD activity and consequent fast-ion redistribution is suppressed. Analysis of these experiments shows complete suppression of MHD activity at high density with increasing activity and fast-ion redistribution at lower densities and higher NB power accompanied by strong evidence for localisation of the redistribution effect to a specific region in the plasma core. The results also indicate correlations between the form of the modelled fast-ion distribution function, the amplitude and growth rate of the fishbone modes, and the magnitude of the redistribution effect. The same analysis has been carried out on models of MAST-Upgrade baseline plasma scenarios to determine whether significant fast-ion redistribution is likely to occur in that device. A simple change to the neutral-beam injector geometry is proposed which is shown to have a significant mitigating effect in terms of the fishbone mode drive and is therefore expected to allow effective plasma heating and current drive over a wider range of plasma conditions in MAST-Upgrade.
description: 26 pages, 7 figures. This is an author-created, un-copyedited version of an article submitted for publication in Nuclear Fusion. IOP Publishing Ltd and IAEA are not responsible for any errors or omissions in this version of the manuscript or any version derived from it
Testing Approaches and Sensors for Satellite-Derived Bathymetry in Nunavut
Creators: name: Holman, Kiyomi
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2020
Subjects: Satellite-derived bathymetry
Remote sensing
Nunavut
Ocean optics
Canada
Arctic
Bathymetry
Hydrography

description: Nearshore bathymetry in the Canadian Arctic is poorly surveyed, but is vital knowledge for coastal communities that rely on marine transportation for resources and development. Nautical charts currently available are often outdated and surveying by traditional methods is both time consuming and expensive. Satellite-derived bathymetry (SDB) offers a significantly cheaper and faster option to provide information on nearshore bathymetry. The two most common approaches to SDB are empirical and physics-based. The empirical approach is simple and typically does well when calibrated with high-quality in-situ data, whereas the physics-based approach is more difficult to implement and requires precise atmospheric correction. This project tests the practical use of five methods within the empirical and physics-based approaches to SDB, using Landsat 8 and Sentinel-2 satellite imagery, at seven sites across Nunavut. Methods tested include: the Ratio-Transform, Multiband, and Random Forest Regression methods (empirical) and radiative transfer modeling (physics-based) using two atmospheric correction models: ACOLITE and Deep Water Correction. All methods typically use geolocated water depth data for validation, as well as calibration for the empirical methods. Spectral reflectance for model inputs were collected in Cambridge Bay, NU. Water depth data were acquired from the Canadian Hydrographic Service. All processing was conducted within the framework of plugins developed for the open-source GIS software, QGIS. Results from the empirical methods were typically poor due to poor calibration data, though Random Forest Regression performed well when good calibration data were available. Due to poor quality validation data, error for the physics-based results cannot be adequately quantified in most places. Additionally, atmospheric correction remains a challenge for the physics-based methods. Overall, results indicate that where large, high-quality calibration datasets are available, Random Forest Regression performs best of all methods tested, with little bias and low mean absolute error in water less than 10 m deep. As such datasets are rare in the Arctic, the physics-based method is often the only option for SDB and is an excellent qualitative tool for informing communities of shallow bathymetry features and assessing navigation risk.
Towards deploying legged humanoids in human environments
Creators: name: Jorgensen, Steven Jens
name: 0000-0003-1305-8714
Publisher: name: The University of Texas at Austin
Year: 2020
Subjects: Humanoids
Whole-body control
Control architectures
Biped
Locomotion
Manipulation
Locomanipulation
IED response

description: While the area of whole-body controllers for humanoids have matured in recent years, deploying humanoid robots in human environments remains a challenge. One difficulty comes from the discrepancy between the models used to design the controllers and the unmodeled phenomena of the real world. Therefore, deploying robots require practical solutions that are robust to these discrepancies. To this end, this dissertation tackles a subset of real-world deployment problems and offers practical solutions to the domains explored. A common theme in the solutions presented have been to reformulate whole-body control concepts to make them realizable in the real-world. In particular, the use of kinematics for task-space trajectory generation in the high-level and joint position and velocity feedback control in the low-level play an important role in functional deployment. The former finds practical use, for instance, in gaze generation, thermal recovery operations, and whole-body manipulation, while the latter is important in dynamic balancing of biped robots and overall trajectory stabilization. This is not to claim that robot dynamics should be ignored for practical deployment. Instead however, the appropriate use of kinematics and dynamics information is the critical factor in efficient trajectory generation and robust feedback control of humanoids. To give evidence to this claim, the discussed approaches have been successfully deployed on a variety of humanoid platforms.
Bringing NCAS data to the masses: CEDA catalogue developments and service intergrations 2017
Creators: name: Parton, Graham A
Publisher: name: Science and Technology Facilities Council (STFC)
Year: 2017
Subjects: ecology and environment

description: The Centre for Environmental Data Analysis (CEDA) hosts an archive of over 180 million files across 5000 data sets. Enabling users to find these data and to ensure NCAS meets its EU Inspire requirements is a fundamental operation of CEDA. Over the last year CEDA has rolled out a number of service updates to aid data discoverability and provide further integration with other CEDA services. The search tool has been changed to include an alternative (Beta) service based on a search engine technology (ElasticSearch) to speed up response times, improve accuracy and search across multiple record types. Other enhancements focus on data management issues such as tagging relationships between data sets and ordering data set lists based on relevance and status. An HTTP API has been added that can retrieve the relevant data set record based on a file or directory path. This approach enables other services to dynamically interrogate the catalogue service to improve automated interactions between CEDA systems. Finally, a new set of bespoke web views have been generated in order to describe AMF data sets, based on campaigns, instruments and long-term facilities.
description: Previously curated at: http://cedadocs.ceda.ac.uk/1444/

The publish date on this item was its original published date.

This item was previously associated with content (as an official url) at: https://www.neodc.rl.ac.uk.

This work was funded by: NERC.

Main files in this record:
parton_stephens_moles.pdf
parton_stephens_moles.pptx

Item originally deposited with Centre for Environmental Data Analysis (CEDA) document repository by Miss Hayley Gray. Transferred to CEDA document repository community on Zenodo on 2022-11-24
Generating extreme quantum scattering in graphene with machine learning
Creators: name: Han, Chen-Di
name: Lai, Ying-Cheng
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Machine Learning (cs.LG)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Graphene quantum dots provide a platform for manipulating electron behaviors in two-dimensional (2D) Dirac materials. Most previous works were of the "forward" type in that the objective was to solve various confinement, transport and scattering problems with given structures that can be generated by, e.g., applying an external electrical field. There are applications such as cloaking or superscattering where the challenging problem of inverse design needs to be solved: finding a quantum-dot structure according to certain desired functional characteristics. A brute-force search of the system configuration based directly on the solutions of the Dirac equation is computational infeasible. We articulate a machine-learning approach to addressing the inverse-design problem where artificial neural networks subject to physical constraints are exploited to replace the rigorous Dirac equation solver. In particular, we focus on the problem of designing a quantum dot structure to generate both cloaking and superscattering in terms of the scattering efficiency as a function of the energy. We construct a physical loss function that enables accurate prediction of the scattering characteristics. We demonstrate that, in the regime of Klein tunneling, the scattering efficiency can be designed to vary over two orders of magnitudes, allowing any scattering curve to be generated from a proper combination of the gate potentials. Our physics-based machine-learning approach can be a powerful design tool for 2D Dirac material-based electronics.
description: 16 pages, 8 figures
title: Εφαρμογές συμπαραγωγής στις αρχές του 20ου αιώνα : ενεργειακή ανάλυση της διαδικασίας παραγωγής στο πλινθοκεραμοποιείο Ν. & Σ. Τσαλαπάτα (1925-1977)
titleType: AlternativeTitle
Creators: name: Σισμανίδης, Αθανάσιος
Publisher: name: University of Thessaly
Year: 2005
Subjects: subject: ΒΙΟΜΗΧΑΝΙΚΗ ΑΝΑΠΤΥΞΗ -- ΕΛΛΑΔΑ -- ΒΟΛΟΣ
subject: ΒΙΟΜΗΧΑΝΙΚΗ ΠΑΡΑΓΩΓΙΚΟΤΗΤΑ -- ΕΛΛΑΔΑ -- ΒΟΛΟΣ

description: Το Βιομηχανικό Μουσείο που έχει προβλεφθεί στα πλαίσια της αποκατάστασης του Πλινθοκεραμοποιείου Τσαλαπάτα, φιλοξενεί επί του παρόντος αρκετές ενδιαφέρουσες μηχανές, συσκευές και τμήματα εγκαταστάσεων από το παλαιό αυτό κεραμοποιείο, το οποίο ήταν ιδιαίτερα αξιόλογο για την εποχή που δημιουργήθηκε (προπολεμικά). Ιδιαίτερα αξιοσημείωτη ήταν η παραγωγή και διαχείριση της ενέργειας, καθώς αυτή προέβλεπε συμπαραγωγή θερμότητας (σε μορφή ατμού), μηχανικής ισχύος (ατμομηχανές) και ηλεκτρισμού. Η παρούσα εργασία αποτελεί μία πρώτη έμπρακτη εκδήλωση του ενδιαφέροντος του Πανεπιστημίου Θεσσαλίας, για παραπέρα αξιοποίηση, για εκπαιδευτικούς και άλλους ευγενείς σκοπούς, του Βιομηχανικού Μουσείου και γενικότερα του Συγκροτήματος Τσαλαπάτα, ενδιαφέρον το οποίο ευνοείται από τη μικρή απόσταση του συγκροτήματος από τις εγκαταστάσεις της Πολυτεχνικής Σχολής στο Πεδίον του Άρεως. Στόχοι της εργασίας είναι οι παρακάτω: • Να αποτυπώσει και να τεκμηριώσει τη διαδικασία παραγωγής, με έμφαση στην παραγωγή και κατανάλωση της θερμικής και μηχανικής ενέργειας, όπως αυτή εξελίχθηκε στις διάφορες φάσεις λειτουργίας του Εργοστασίου. • Να καταγράψει τον σωζόμενο Ηλεκτρομηχανολογικό εξοπλισμό (λέβητες, ατμομηχανές, ηλεκτρογεννήτριες, πρέσες, μετάδοση ισχύος, βαγονέτα κτλ), και να συλλέξει στοιχεία τεκμηρίωσής από διάφορες πηγές για την καλύτερη προβολή του. • Να προχωρήσει σε ανάλυση λειτουργίας, καταγραφή γεωμετρικών και θερμικών δεδομένων σχεδιασμού και ενεργειακή ανάλυση των κύριων θερμικών διεργασιών παραγωγής κεραμιδιών και τούβλων στο Εργοστάσιο, (Κάμινος, παλαιό και νέα ξηραντήρια), και να προβεί σε συγκρίσεις με τα αντίστοιχα αδιαστατοποιημένα δεδομένα σύγχρονων Εργοστασίων, και τέλος • Να προτείνει τρόπους προβολής συγκεκριμένων διεργασιών του Εργοστασίου, ώστε να λειτουργήσει καλύτερα η εκπαιδευτική και επιδεικτική συνιστώσα του Βιομηχανικού Μουσείου, με έμφαση στο ρόλο του Μηχανολόγου Μηχανικού στο σχεδίασμά σύνθετων Βιομηχανικών Εγκαταστάσεων με Συμπαραγωγή.
Magnetic properties of geometrically frustrated SrGd2O4
Creators: name: Young, O.
name: Balakrishnan, G.
name: Lees, M. R.
name: Petrenko, O. A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A study of the magnetic properties of the frustrated rare earth oxide SrGd2O4 has been completed using bulk property measurements of magnetization, susceptibility and specific heat on single crystal samples. Two zero-field phase transitions have been identified at 2.73 and 0.48 K. For the field, H, applied along the a and b axes, a single boundary is identified that delineates the transition from a low field, low temperature magnetically ordered regime to a high field, high temperature paramagnetic phase. Several field-induced transitions, however, have been observed with H || c. The measurements have been used to map out the magnetic phase diagram of SrGd2O4, suggesting that it is a complex system with several competing magnetic interactions. The low-temperature magnetic behavior of SrGd2O4 is very different compared to the other SrLn2O4 (Ln = Lanthanide) compounds, even though all of the SrLn2O4 compounds are isostructural, with the magnetic ions forming a low-dimensional lattice of zigzag chains that run along the c axis. The differences are likely to be due to the fact that in the ground state Gd3+ has zero orbital angular momentum and therefore the spin-orbit interactions, which are crucial for other SrLn2O4 compounds, can largely be neglected. Instead, given the relatively short Gd3+-Gd3+ distances in SrGd2O4, dipolar interactions must be taken into account for this antiferromagnet alongside the Heisenberg exchange terms.
description: 10 pages, 9 figures
Quantum criticality in a uniaxial organic ferroelectric
Creators: name: Rowley, S. E.
name: Hadjimichael, M.
name: Ali, M. N.
name: Durmaz, Y. C.
name: Lashley, J. C.
name: Cava, R. J.
name: Scott, J. F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Tris-sarcosine calcium chloride (TSCC) is a highly uniaxial ferroelectric with a Curie temperature of approximately 130K. By suppressing ferroelectricity with bromine substitution on the chlorine sites, pure single crystals were tuned through a ferroelectric quantum phase transition. The resulting quantum critical regime was investigated in detail - the first time for a uniaxial ferroelectric and for an organic ferroelectric - and was found to persist up to temperatures of at least 30K to 40K. The nature of long-range dipole interactions in uniaxial materials, which lead to non-analytical terms in the free-energy expansion in the polarization, predict a dielectric susceptibility varying as $1/T^3$ close to the quantum critical point. Rather than this, we find that the dielectric susceptibility varies as $1/T^2$ as expected and observed in better known multi-axial systems. We explain this result by identifying the ultra-weak nature of the dipoles in the TSCC family of crystals. Interestingly we observe a shallow minimum in the inverse dielectric function at low temperatures close to the quantum critical point in paraelectric samples that may be attributed to the coupling of quantum polarization and strain fields. Finally we present results of the heat capacity and electro-caloric effect and explain how the time dependence of the polarization in ferroelectrics and paraelectrics should be considered when making quantitative estimates of temperature changes induced by applied electric fields.
description: 6 pages, 4 figures
Probabilistic Transitive Closure of Fuzzy Cognitive Maps: Algorithm Enhancement and an Application to Work-Integrated Learning
Creators: name: Akbari, Masoomeh
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2020
Subjects: Fuzzy Cognitive Map

description: A fuzzy cognitive map (FCM) is made up of factors and direct impacts. In graph theory, a bipolar weighted digraph is used to model an FCM; its vertices represent the factors, and the arcs represent the direct impacts. Each direct impact is either positive or negative, and is assigned a weight; in the model considered in this thesis, each weight is interpreted as the probability of the impact. A directed walk from factor F to factor F' is interpreted as an indirect impact of F on F'. The probabilistic transitive closure (PTC) of an FCM (or bipolar weighted digraph) is a bipolar weighted digraph with the same set of factors, but with arcs corresponding to the indirect impacts in the given FCM. Fuzzy cognitive maps can be used to represent structured knowledge in diverse fields, which include science, engineering, and the social sciences. In [P. Niesink, K. Poulin, M. Sajna, Computing transitive closure of bipolar weighted digraphs, Discrete Appl. Math. 161 (2013), 217-243], it was shown that the transitive closure provides valuable new information for its corresponding FCM. In particular, it gives the total impact of each factor on each other factor, which includes both direct and indirect impacts. Furthermore, several algorithms were developed to compute the transitive closure of an FCM. Unfortunately, computing the PTC of an FCM is computationally hard and the implemented algorithms are not successful for large FCMs. Hence, the Reduction-Recovery Algorithm was proposed to make other (direct) algorithms more efficient. However, this algorithm has never been implemented before. In this thesis, we code the Reduction-Recovery Algorithm and compare its running time with the existing software. Also, we propose a new enhancement on the existing PTC algorithms, which we call the Separation-Reduction Algorithm. In particular, we state and prove a new theorem that describes how to reduce the input digraph to smaller components by using a separating vertex. In the application part of the thesis, we show how the PTC of an FCM can be used to compare different standpoints on the issue of work-integrated learning.
Time-dependent potential barriers and superarrivals
Creators: name: Karami, H.
name: Mousavi, S. V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Scattering of a Gaussian wavepacket from rectangular potential barriers with increasing widths or heights is studied numerically. It is seen that during a certain time interval the time-evolving transmission probability increases compared to the corresponding unperturbed cases. In the literature this effect is known as superarrival in transmission probability. We present a trajectory-based explanation for this effect by using the concept of quantum potential energy and computing a selection of Bohmian trajectories. Relevant parameters in superarrivals are determined for the case that the barrier width increases linearly during the dispersion of the wavepacket. Nonlinear in time perturbation is also considered.
description: Accepted by Canadian Journal of Physics
Serious games for serious purposes : learning through simulation games in medical education
Creators: name: Johnson, Garrett Spain
name: 0000-0003-1819-108X
Publisher: name: The University of Texas at Austin
Year: 2020
Subjects: Serious games
Undergraduate medical education
Control-value theory of achievement emotions

description: Serious games provide an exciting new technology for the field of education. Within medical education, this is especially true as serious games can provide novel learning experiences that students may otherwise not be able to have. In order to reach their full utility, games must be examined closely for how they may function in helping students learn. This report argues that achievement emotions, as presented in control-value theory, are an important aspect that needs attention during the implementation and incorporation of serious games into the curriculum of medical schools. Following such an argument, recommendations are made in support for the incorporation of serious games into the curriculum of a particularly innovative medical school. Benefits and limitations of serious games are reviewed
Spectral CT Reconstruction via Low-rank Representation and Structure Preserving Regularization
Creators: name: He, Yuanwei
name: Zeng, Li
name: Xu, Qiong
name: Wang, Zhe
name: Yu, Haijun
name: Shen, Zhaoqiang
name: Yang, Zhaojun
name: Zhou, Rifeng
Publisher: name: arXiv
Year: 2022
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: With the development of computed tomography (CT) imaging technology, it is possible to acquire multi-energy data by spectral CT. Being different from conventional CT, the X-ray energy spectrum of spectral CT is cutting into several narrow bins which leads to the result that only a part of photon can be collected in each individual energy channel, which cause the image qualities to be severely degraded by noise and artifacts. To address this problem, we propose a spectral CT reconstruction algorithm based on low-rank representation and structure preserving regularization in this paper. To make full use of the prior knowledge about both the inter-channel correlation and the sparsity in gradient domain of inner-channel data, this paper combines a low-rank correlation descriptor with a structure extraction operator as priori regularization terms for spectral CT reconstruction. Furthermore, a split-Bregman based iterative algorithm is developed to solve the reconstruction model. Finally, we propose a multi-channel adaptive parameters generation strategy according to CT values of each individual energy channel. Experimental results on numerical simulations and real mouse data indicate that the proposed algorithm achieves higher accuracy on both reconstruction and material decomposition than the methods based on simultaneous algebraic reconstruction technique (SART), total variation minimization (TVM), total variation with low-rank (LRTV), and spatial-spectral cube matching frame (SSCMF). Compared with SART, our algorithm improves the feature similarity (FSIM) by 40.4% on average for numerical simulation reconstruction, whereas TVM, LRTV, and SSCMF correspond to 26.1%, 28.2%, and 29.5%, respectively.
description: 21 pages, 9 figures
Innovative GFRP sections shape and proportions in civil engineering structures
Creators: name: Lamberti, Marco
Publisher: name: Universita degli studi di Salerno
Year: 2016
Subjects: subject: ICAR/08 SCIENZA DELLE COSTRUZIONI
subject: Glass Fibre Reinforced Polymers
subject: FRPs
subject: ACCS

description: 2014 - 2015
description: Although traditional materials (steel, concrete, timber and masonry) still dominate the building industry, new materials are constantly being explored by engineers and scientists. For instance, the use of the so-called FRPs (Fibre-Reinforced Polymers) is gradually spreading worldwide [1-4]. The main idea of FRPs is the combination, on a macroscopic scale, of two different long continuous fibres and a polymeric resin. More specifically, high strength fibres (glass, carbon, aramid or ultra-thin steel wires) provide strength and stiffness while the resin (polyester, vinylester or epoxy) protects the fibres and guarantees the stress transfer between them. As a result, enhanced final properties are obtained with respect to those exhibited by the individual constituents. Among several type of fibers, Glass Fibre Reinforced Polymers (GFRP) are widely used due to their relatively low cost, although glass fibres exhibit much lower elastic modulus and ultimate strength than carbon fibres. In addition, some additional issues emerge with regard to durability in alkaline environments and long-term response under sustained stresses. FRP pultruded beams take advantage of their principal features [5-6]. Since the late 1990s, among the FRPs elements, those frequently used in civil engineering are the pultruded ones. They are obtained by the pultrusion process that make possible to produce such profiles with both closed or open cross sections; the only limitation is that the same cross section is required over the length. Pultruded profiles reinforced with glass fibers (GFRP) present many advantages, including very high stiffness and strength to weight ratios, magnetic transparency, corrosion resistance, and an effective manufacturing process. For these features they can be qualified as non-corrosive, high mechanical strength and lightweight materials. In the last few years, they have been used in several different civil structures, acquiring a relevant role as primary bearing structural elements for applications such as cables, stands, truss members, footbridges, boardwalks, high voltage electricity poles, small buildings and emergency-oriented solutions... [edited by Author]