cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Parsec-scale Imaging of the Radio-bubble Seyfert galaxy NGC 6764
Creators: name: Kharb, P.
name: Hota, Ananda
name: Croston, J. H.
name: Hardcastle, M. J.
name: O'Dea, C. P.
name: Kraft, R. P.
name: Axon, D. J.
name: Robinson, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We have observed the composite active galactic nucleus (AGN)-starburst galaxy NGC 6764 with the Very Long Baseline Array at 1.6 and 4.9 GHz. These observations have detected a "core-jet" structure and a possible weak counterjet component at 1.6 GHz. The upper limits to the core and jet (1.6-4.9 GHz) spectral index are 0.6 and 0.3, respectively. Taken together with the high brightness temperature of ~10^7 K for the core region, the radio emission appears to be coming from a synchrotron jet. At a position angle of 25 degrees, the parsec-scale jet seems to be pointing closely toward the western edge of the southern kpc-scale bubble in NGC 6764. A real connection between the parsec- and sub-kpc-scale emission would not only suggest the presence of a curved jet, but also a close link between the AGN jet and the radio bubbles in NGC 6764. We demonstrate that a precessing jet model can explain the radio morphology from parsec- to sub-kpc scales, and the model best-fit parameters of jet speed and orientation are fully consistent with the observed jet-to-counterjet surface brightness ratio. The jet however appears to be disrupted on scales of hundreds of parsecs, possibly due to interaction with and entrainment of the interstellar medium gas, which subsequently leads to the formation of bubbles. The jet energetics in NGC 6764 suggest that it would take 12-21 Myr to inflate the (southern) bubble. This timescale corresponds roughly to the starburst episode that took place in NGC 6764 about 15-50 Myr ago, and could be indicative of a close connection between jet formation and the starburst activity in this galaxy.
description: 19 pages, 2 figures, accepted for publication to The Astrophysical Journal. Corrected typos and synchrotron lifetime in the proof
Broken Baby Skyrmions
Creators: name: Jäykkä, Juha
name: Speight, Martin
name: Sutcliffe, Paul
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The baby Skyrme model is a (2+1)-dimensional analogue of the Skyrme model, in which baryons are described by topological solitons. In this paper we introduce a version of the baby Skyrme model in which the global O(3) symmetry is broken to the dihedral group D_N. It is found that the single soliton in this theory is composed of N partons, that are topologically confined. The case N=3 is studied in some detail and multi-soliton solutions are computed. These soliton solutions are related to polyiamonds, which are plane figures composed of equilateral triangles joined by common edges. It is shown that the solitons may be viewed as pieces of a doubly periodic soliton lattice. An alternative model with D_3 symmetry is also introduced, which has an exact explicit soliton lattice solution. Soliton solutions are computed and compared in the two D_3 theories. Some comments are made regarding the extension of these ideas to the Skyrme model.
description: 20 pages, 7 figures. Substantially extended version plus corrections
Decay spectroscopy of N ~ Z nuclei in the vicinity of ¹⁰⁰Sn
Creators: name: Park, Joochun (Jason)
Publisher: name: University of British Columbia
Year: 2017

description: The nuclear shell model (SM) has been very successful in describing the properties and the structure of near-stable and stable isotopes near the magic nuclei. Today, the advent of powerful facilities capable of producing radioactive isotopes far from stability has enabled the test of the SM on very proton-rich or neutron-rich magic nuclei. 100/50Sn50 is a proton-rich doubly-magic nucleus, but is nearly unstable against proton emission. Key topics of nuclear structure in this region include the location of the proton dripline, the effect of proton-neutron interactions in N ~ Z nuclei, single-particle energies of orbitals above and below the N = Z = 50 shell gaps, and the properties of the superallowed Gamow-Teller decay of ¹⁰⁰Sn. A decay spectroscopy experiment was performed on ¹⁰⁰Sn and nuclei in its vicinity at the RIKEN Nishina Center in June 2013. The isotopes of interest were produced from fragmentation reactions of 124/54Xe on a 9/4Be target, and were separated and identified on an event-by-event basis. Decay spectroscopy was performed by implanting the radioactive isotopes in the Si detector array (WAS3ABi) and observing their subsequent decay radiations. β⁺ particles and protons were detected by WAS3ABi, and γ rays were detected by a Ge detector array (EURICA). Of the proton-rich isotopes produced in this experiment, over 20 isotopes as light as ⁸⁸Zr and as heavy as ¹⁰¹Sn were individually studied. New and improved measurements of isotope/isomer half-lives, β-decay endpoint energies, β-delayed proton emission branching ratios, and γ-ray transitions were analyzed. In general the new results were well reproduced by the SM, highlighting a relatively robust ¹⁰⁰Sn core. However, the level scheme of ¹⁰⁰Sn's β-decay daughter nucleus ¹⁰⁰In was not conclusively determined because of several missing observations which were expected from various SM predictions. Significantly higher β-decay and γ-ray statistics are required on several nuclei, including ¹⁰⁰Sn, to evaluate the limit of the current understanding of their structure.
A situation analysis of competences of research ethics committee members regarding review of research protocols with complex and emerging study designs in Uganda
Creators: name: Ainembabazi, Provia
name: Castelnuovo, Barbara
name: Okoboi, Stephen
name: Arinaitwe, Walter Joseph
name: Parkes-Ratanshi, Rosalind
name: Byakika-Kibwika, Pauline
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: Research Article
Ethics in Biomedical Research
Complex and emerging study designs
Research Ethics Committees
Competence

description: Abstract: Background: Over the past two decades, Uganda has experienced a significant increase in clinical research driven by both academia and industry. This has been combined with a broader spectrum of research proposals, with respect to methodologies and types of intervention that need evaluation by Research Ethics Committees (RECs) with associated increased requirement for expertise. We assessed the competencies of REC members regarding review of research protocols with complex and emerging research study designs. The aim was to guide development of a training curriculum to improve the quality of scientific and ethical review. Methods: This was a cross-sectional study design, with quantitative data collection methods. Research Ethics Committee members completed a structured pre-coded questionnaire on current competence with complex and emerging study design. REC members were asked to outline a list of additional topics for which they needed training. Data from coded questions were entered into Epidata Version 3.1 and then exported to STATA Version14.1 for analysis. Descriptive analysis was performed and findings are presented using percentages and frequencies. Results: We enrolled 55 REC members from 6 RECs who have a total of 97 members. The majority of whom were males (56.4%, n = 31/55). The level of competence for review of selected study design was lowest for Controlled Human Infection Model (10.9%, n = 6) and reverse pharmacology design (10.9%, n = 6), and highest for cluster randomized study design (52.7%, n = 29) and implementation science research (52.7%, n = 29). Conclusion: Competence for review of research protocols with complex and emerging study design was low among participating REC members. We recommend prioritising training of REC members on complex and emerging study designs to enhance quality of research protocol review.
Spiky Strings on NS5-branes
Creators: name: Biswas, Sagar
name: Panigrahi, Kamal L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study rigidly rotating strings in the near horizon geometry of a stack of Neveu-Schwarz (NS) 5-branes. We solve the Nambu-Goto action of the fundamental string in the presence of a NS-NS two form $(B_{μν})$ and find out limiting cases corresponding to magnon and spike like solutions.
description: 10 pages, to appear in PLB
Analysis of Current Harmonics in Inverter-Driven Interior Permanent Magnet Synchronous Machines
Creators: name: Gemassmer, Tobias
name: Braun, Michael
Publisher: name: Karlsruhe
Year: 2013
Subjects: Permanent magnet moto
Converter machine interactions
Harmonics
Modulation strategy

description: This paper presents the analysis of current harmonics in an inverter-driven interior permanent magnet machine for different modulation methods. In contrast to other approaches, the influence of the saliency (Ld != Lq) on the harmonics is being considered. By use of the rms-value of the currents, analytically closed equations can be deduced and tedious Fourier analyses of single harmonics can be avoided. The derivation of the analytic equations is described and the results are verified by numerical simulation as well as by experimental results.
Le Ophrys della sezione Bertoloniorum (Orchidaceae) [Ophrys of the section Bertoloniorum (Orchidaceae)]
Creators: name: Romieg Soca
Publisher: name: Zenodo
Year: 2007
Subjects: Ophrys

description: Soca R., 2007. Le Ophrys della sezione Bertoloniorum (Orchidaceae) [Ophrys of the section Bertoloniorum (Orchidaceae)]. Caesiana 29: 13-33.
External Batched Range Minimum Queries and LCP Construction
Creators: name: Feist, Daniel
Publisher: name: Karlsruhe
Year: 2013

description: This work deals with I/O-optimal suffix array (SA) and longest common prefix (LCP) array construction in external memory. For this purpose, the I/O-optimale DC3 algorithm is enhanced by LCP construction and adapted accordingly to the external memory model. In this context we present a method to construct the required range minimum queries (RMQs) efficiently in external memory. The core of this work is a description and implementation of the resulting external DC3-LCP algorithm using the Stxxl - the C++ Standard Template Library for Extra Large Data Sets. Experimental results based on realistic, real-world instances rounds off this work.
A Reaction Plane Detector for PHENIX at RHIC
Creators: name: Richardson, E.
name: Akiba, Y.
name: Anderson, N.
name: Bickley, A. A.
name: Chujo, T.
name: Cole, B. A.
name: Esumi, S.
name: Haggerty, J. S.
name: Hanks, J.
name: Hemmick, T. K.
name: Hutchison, M.
name: Ikeda, Y.
name: Inaba, M.
name: Jia, J.
name: Lynch, D.
name: Miake, Y.
name: Mignerey, A. C.
name: Niida, T.
name: O'Brien, E.
name: Pak, R.
name: Shimomura, M.
name: Stankus, P. W.
name: Todoroki, T.
name: Watanabe, K.
name: Wei, R.
name: Xie, W.
name: Zajc, W. A.
name: Zhang, C.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: A plastic scintillator paddle detector with embedded fiber light guides and photomultiplier tube readout, referred to as the Reaction Plane Detector (RXNP), was designed and installed in the PHENIX experiment prior to the 2007 run of the Relativistic Heavy Ion Collider (RHIC). The RXNP's design is optimized to accurately measure the reaction plane (RP) angle of heavy-ion collisions, where, for mid-central $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions, it achieved a $2^{nd}$ harmonic RP resolution of $\sim$0.75, which is a factor of $\sim$2 greater than PHENIX's previous capabilities. This improvement was accomplished by locating the RXNP in the central region of the PHENIX experiment, where, due to its large coverage in pseudorapidity ($1.0
description: 28 authors from 10 institutions, 24 pages, 16 figures and 3 tables. Published in Nuclear Instruments and Methods in Physics Research Section A
Use of Primary Care Data in Research and Pharmacovigilance: Eight Scenarios Where Prescription Data are Absent
Creators: name: Okoli, Grace N.
name: Myles, Puja
name: Murray-Thomas, Tarita
name: Shepherd, Hilary
name: Wong, Ian C. K.
name: Edwards, Duncan
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: Review Article

description: Abstract: The use of primary care databases has been integral in pharmacoepidemiological studies and pharmacovigilance. Primary care databases derive from electronic health records and offer a comprehensive description of aggregate patient data, from demography to medication history, and good sample sizes. Studies using these databases improve our understanding of prescribing characteristics and associated risk factors to facilitate better patient care, but there are limitations. We describe eight key scenarios where study data outcomes can be affected by absent prescriptions in UK primary care databases: (1) out-of-hours, urgent care and acute care prescriptions; (2) specialist-only prescriptions; (3) alternative community prescribing, such as pharmacy, family planning clinic or sexual health clinic medication prescriptions; (4) newly licensed medication prescriptions; (5) medications that do not require prescriptions; (6) hospital inpatient and outpatient prescriptions; (7) handwritten prescriptions; and (8) private pharmacy and private doctor prescriptions. The significance of each scenario is dependent on the type of medication under investigation, nature of the study and expected outcome measures. We recommend that all researchers using primary care databases be aware of the potential for missing prescribing data and be sensitive to how this can vary substantially between items, drug classes, patient groups and over time. Close liaison with practising primary care clinicians in the UK is often essential to ensure awareness of nuances in clinical practice.
Universal Robotic Gripper based on the Jamming of Granular Material
Creators: name: Brown, Eric
name: Rodenberg, Nicholas
name: Amend, John
name: Mozeika, Annan
name: Steltz, Erik
name: Zakin, Mitchell R.
name: Lipson, Hod
name: Jaeger, Heinrich M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Gripping and holding of objects are key tasks for robotic manipulators. The development of universal grippers able to pick up unfamiliar objects of widely varying shape and surface properties remains, however, challenging. Most current designs are based on the multi-fingered hand, but this approach introduces hardware and software complexities. These include large numbers of controllable joints, the need for force sensing if objects are to be handled securely without crushing them, and the computational overhead to decide how much stress each finger should apply and where. Here we demonstrate a completely different approach to a universal gripper. Individual fingers are replaced by a single mass of granular material that, when pressed onto a target object, flows around it and conforms to its shape. Upon application of a vacuum the granular material contracts and hardens quickly to pinch and hold the object without requiring sensory feedback. We find that volume changes of less than 0.5% suffice to grip objects reliably and hold them with forces exceeding many times their weight. We show that the operating principle is the ability of granular materials to transition between an unjammed, deformable state and a jammed state with solid-like rigidity. We delineate three separate mechanisms, friction, suction and interlocking, that contribute to the gripping force. Using a simple model we relate each of them to the mechanical strength of the jammed state. This opens up new possibilities for the design of simple, yet highly adaptive systems that excel at fast gripping of complex objects.
description: 10 pages, 7 figures
ИПАКЧИЛИК ЧИҚИНДИЛАРИДАН ОЛИНГАН ЭРИТМАДА ОХОРЛАНГАН ИПЛАРНИ СИФАТ КЎРСАТКИЧИНИ БАҲОЛАШ
Creators: name: Тойирова, Т.А.
name: Жаниева, М.Б.
Publisher: name: Zenodo
Year: 2023

description: Мазкур мақолада тўқувчиликкка мўлжалланган танда ипларини охорлашда пилла чувиш жараёни чиқиндиси-пилла юмшатилган сирицинли сувнинг турли ҳароратларида фойдаланиш бўйича маълумотлар келтирилган.
A Journey to the West: The Ancient Dispersal of Rice Out of East Asia
Creators: name: Spengler, Robert N.
name: Stark, Sören
name: Zhou, Xinying
name: Fuks, Daniel
name: Tang, Li
name: Mir-Makhamad, Basira
name: Bjørn, Rasmus
name: Jiang, Hongen
name: Olivieri, Luca M.
name: Begmatov, Alisher
name: Boivin, Nicole
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: Review
Rice
Paddy farming
West Asia
Archaeobotany
Agricultural intensification
Crop exchange

description: Funder: Max Planck Institute for the Science of Human History (2)
description: Abstract: Rice is one of the most culturally valued and widely grown crops in the world today, and extensive research over the past decade has clarified much of the narrative of its domestication and early spread across East and South Asia. However, the timing and routes of its dispersal into West Asia and Europe, through which rice eventually became an important ingredient in global cuisines, has remained less clear. In this article, we discuss the piecemeal, but growing, archaeobotanical data for rice in West Asia. We also integrate written sources, linguistic data, and ethnohistoric analogies, in order to better understand the adoption of rice outside its regions of origin. The human-mediated westward spread of rice proceeded gradually, while its social standing and culinary uses repeatedly changing over time and place. Rice was present in West Asia and Europe by the tail end of the first millennium BC, but did not become a significant crop in West Asia until the past few centuries. Complementary historical, linguistic, and archaeobotanical data illustrate two separate and roughly contemporaneous routes of westward dispersal, one along the South Asian coast and the other through Silk Road trade. By better understanding the adoption of this water-demanding crop in the arid regions of West Asia, we explore an important chapter in human adaptation and agricultural decision making.
D 5.10 Report on technology integration
Creators: name: Ricotti, Leonardo
Publisher: name: Zenodo
Year: 2023

description: ADMAIORA is a highly interdisciplinary, collaborative project. To achieve the final project objectives, intense efforts were invested in integrating the different technologies developed by the project partners, into viable and efficient solutions that could be tested in the final phase of the project. Integration is the focus of Task 5.4 and in this report the results obtained are described, in a qualitative way. Integration concerned three main domains of the project: (1) integration of cell-laden nanocomposite hydrogels and their ultrasound stimulation; (2) integration of stimulation brace, monitoring brace and IoT framework; (3) integration of handheld bioprinting tool. This Deliverable is publicly available; thus, only general indications and demonstration of the different integration procedures have been reported here, without entering technical details that should be considered confidential (due to possible future patenting, or publication in scientific papers).
Neuronal growth patterns in states of learning and activity blockade
Creators: name: Opushnyev, Serhiy
Publisher: name: University of British Columbia
Year: 2017

description: The role of activity on the formation of neural networks during development is known to be critical. In the research conducted for this dissertation the effect of experience was probed at the single neuron level. First, a method for selecting neurons based on their responses to a visual stimulus and electroporating the selected neurons in a somata dense region was developed. This method was then used to select neurons responsive to a predetermined visual stimulus and the growth behavior of the neuronal arbor was observed in the presence of visual stimuli. When neurons were trained to better discern the visual stimulus the plasticity of the neuron was correlated with the dendritic growth behavior. In general, responsive neurons tended to prune their dendritic arbors while non-responsive neurons tended to grow. Interestingly, neurons that acquired a response with training tended to grow before acquiring a response and prune after. Blockade of NMDA receptors abolished these effects. In a separate set of experiments dendritic growth patterns were observed while all excitatory activity was blocked pharmacologically. These experiments showed that short-term (1.5 hours) excitatory activity blockade does not alter dendritic growth patterns. However, 30 minutes after the start of the activity blockade, the density of filopodia increased, suggesting that the neuron was compensating for the lack of activity.
Remembering forgotten heroes and the idealisation of true love: Veteran memorial activism in contemporary China
Creators: name: Lin, Jacqueline Zhenru
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: Articles
China
embodied nostalgia
memorialisation
nostalgia
veteran

description: Recent research on collective memory and war commemoration highlights the ‘conspicuous silence’ of war veterans in Chinese history. Studies of the War of Resistance against Japan (1937–1945) typically reflect either a state-centred approach, which emphasises the official history constructed by the Chinese Communist Party (CCP), or the alternative narratives constructed by intellectual elites in post-socialist China. In response to these top-down narratives, this essay focuses instead on a historical redress movement led by ex-servicemen of the People’s Liberation Army (PLA) in the People’s Republic of China (PRC). The former PLA members, the participant volunteers of this movement, devote themselves into seeking and supporting a group of forgotten Kuomintang (KMT) veterans who fought against the Japanese invaders in the Second World War but now struggle with impoverished living conditions. Drawing on ethnographic fieldwork from 2013 to 2015, I will show how the daily interactions between these two groups of veterans embody a more private and internalised sense of commemorative yearning for a lost past, highlighting in the process the value of ethnographic research in breaking through the wall of silence constructed by hegemonic histories around veteran communities and their role in making war history.
Community Building for FAIR Data - Leiden community building workshop
Creators: name: Clare, Connie
Publisher: name: Zenodo
Year: 2021

description: A presentation about the development of the 4TU.ResearchData community (https://community.data.4tu.nl/) delivered during a workshop session at Leiden Research Support Conference (https://www.staff.universiteitleiden.nl/events/2021/09/research-support-conference-en).
Performance of un-retrofitted and retrofitted wood I-joists with flange notch or web hole
Creators: name: Islam, Mohammad Shahidul
Publisher: name: University of British Columbia
Year: 2017

description: Composite wood I-joists have been used widely as floor and roof joists in the construction of commercial and residential buildings in Europe and North America since mid-1930s. These engineered timber I-joists are less expensive, lighter in weight, stronger, and more efficient compared to the solid sawn lumber beams. According to the Canadian Standards for Wood Design (CSA-O86) and manufacturer design guidelines, flange-cut on I-joists are strictly prohibited. However, notches in the top flange and openings in the web of I-joists are commonly made during construction to facilitate the electro-mechanical systems of a building. Due to these flange-notches and web-holes, the ultimate capacity and stiffness of the I-joist section get reduced significantly. This phenomenon will be more critical in the cases of web opening at shear span and flange notch at mid span. This may lead to the I-joist fail prematurely in shear or flexure in a brittle manner. The effect of flange-notches and web-holes on the strength properties (e.g. load carrying capacity, flexural strength, and shear strength) of timber I-joists need to be understood before reinforcing those deficient I-joists. The core objective of this thesis is to understand and predict the behavior of the I-joists having flange-notch and web-hole. Another objective of this study is to retrofit notches and web-holes with conventional and composite material, determine their performances, and provide predictive equations. For retrofitting purpose, Oriented Strand Board (OSB) collars and Glass Fibre Reinforced Polymer (GFRP) plates were used as reinforcing elements with different configurations. A total of 454 I-joists were tested with different notch and hole configurations. From the test results, it was observed that the presence of notch and hole reduced the capacity and stiffness of I-joists significantly. Findings also revealed that some retrofitting options can help improve the capacity as compared to the control I-joists. Finally, analytical models were developed to predict the behavior of flange notched and web holed I-joists and their retrofitted ones. Developed analytical models were validated with the experimental results and it was found that the analytical models can estimate the stiffness of those deficient and retrofitted I-joists with a fairly high accuracy.
Elliptic recursion for 4-point superconformal blocks and bootstrap in N=1 SLFT
Creators: name: Suchanek, Paulina
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: All types of 4-point spheric conformal blocks in both sectors of N=1 superconformal field theory are introduced and analyzed. The elliptic recurrence formulae are derived for all the types of blocks not previously discussed in the literature. The results are used for numerical verification of the crossing symmetry of some 4-point functions in the N=1 superconformal Liouville field theory.
description: 36 pages, 3 figures, added references
Poincare gauge theory of gravity: Friedman cosmology with even and odd parity modes. Analytic part
Creators: name: Baekler, Peter
name: Hehl, Friedrich W.
name: Nester, James M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a cosmological model in the framework of the Poincaré gauge theory of gravity (PG). The gravitational Lagrangian is quadratic in curvature and torsion. In our specific model, the Lagrangian contains (i) the curvature scalar $R$ and the curvature pseudo-scalar $X$ linearly and quadratically (including an $RX$ term) and (ii) pieces quadratic in the torsion {\it vector} $\cal V$ and the torsion {\it axial} vector $\cal A$ (including a ${\cal V}{\cal A}$ term). We show generally that in quadratic PG models we have nearly the same number of parity conserving terms (`world') and of parity violating terms (`shadow world'). This offers new perspectives in cosmology for the coupling of gravity to matter and antimatter. Our specific model generalizes the fairly realistic `torsion cosmologies' of Shie-Nester-Yo (2008) and Chen et al.\ (2009). With a Friedman type ansatz for an orthonormal coframe and a Lorentz connection, we derive the two field equations of PG in an explicit form and discuss their general structure in detail. In particular, the second field equation can be reduced to first order ordinary differential equations for the curvature pieces $R(t)$ and $X(t)$. Including these along with certain relations obtained from the first field equation and curvature definitions, we present a first order system of equations suitable for numerical evaluation. This is deferred to the second, numerical part of this paper.
description: Latex computerscript, 25 pages; mistakes corrected, references added, notation and title slightly changed; accepted by Phys. Rev. D
Parallel Preconditioners for an Ocean Model in Climate Simulations
Creators: name: Wilhelm, Florian
Publisher: name: Karlsruhe
Year: 2012
Subjects: High-Performance Computing
Parallel Preconditioners
Support Theory
Reconfigurable Computing
Climate Simulations

description: In this work, we evaluate different solvers and preconditioners for solving the barotropic system of an ocean model to achieve optimal performance on a high-performance computer. In the field of support theory, we derive upper bounds for the condition number of a system that is preconditioned with a block-Jacobi Steiner graph preconditioner. Furthermore, we analyze the application of a high-level approach for programming preconditioners on FPGAs.
Short baseline neutrino oscillations: when entanglement suppresses coherence
Creators: name: Boyanovsky, Daniel
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: For neutrino oscillations to take place the entangled quantum state of a neutrino and a charged lepton produced via charged current interactions must be disentangled. Implementing a non-perturbative Wigner-Weisskopf method we obtain the correct \emph{entangled} quantum state of neutrinos and charged leptons from the (two-body) decay of a parent particle. The source lifetime and disentanglement length scale lead to a suppression of the oscillation probabilities in short-baseline experiments. The suppression is determined by $π\, L_s/L_{osc}$ where $L_s$ is the \emph{smallest} of the decay length of the parent particle or the disentanglement length scale. For $L_s \geq L_{osc}$ coherence and oscillations are suppressed. These effects are more prominent in \emph{short base line experiments} and at low neutrino energy. We obtain the corrections to the appearance and disappearance probabilities modified by both the lifetime of the source and the disentanglement scale and discuss their implications for accelerator and reactor experiments. These effects imply that fits to the experimental data based on the usual quantum mechanical formulation \emph{underestimate} $\sin^2(2θ)$ and $δm^2$, and are more dramatic for $δm^2\simeq \,\mathrm{eV}^2$, the mass range for new generations of sterile neutrinos that could explain the short-baseline anomalies.
description: 29 pages, 6 figures, revised MiniBooNE estimates, matches published version
Alternative Stable Scroll Waves and Conversion of Autowave Turbulence
Creators: name: Foulkes, Andrew J.
name: Barkley, Dwight
name: Biktashev, Vadim N.
name: Biktasheva, Irina V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Rotating spiral and scroll waves (vortices) are investigated in the FitzHugh-Nagumo model of excitable media. The focus is on a parameter region in which there exists bistability between alternative stable vortices with distinct periods. Response Functions are used to predict the filament tension of the alternative scrolls and it is shown that the slow-period scroll has negative filament tension, while the filament tension of the fast-period scroll changes sign within a hysteresis loop. The predictions are confirmed by direct simulations. Further investigations show that the slow-period scrolls display features similar to delayed after-depolarisation (DAD) and tend to develop into turbulence similar to Ventricular Fibrillation (VF). Scrolls with positive filament tension collapse or stabilize, similar to monomorphic Ventricular Tachycardia (VT). Perturbations, such as boundary interaction or shock stimulus, can convert the vortex with negative filament tension into the vortex with positive filament tension. This may correspond to transition from VF to VT unrelated to pinning.
description: 13 pages, 20 figures, as submitted to Chaos 2010/08/23
All non-classical correlations can be activated into distillable entanglement
Creators: name: Piani, Marco
name: Gharibian, Sevag
name: Adesso, Gerardo
name: Calsamiglia, John
name: Horodecki, Pawel
name: Winter, Andreas
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We devise a protocol in which general non-classical multipartite correlations produce a physically relevant effect, leading to the creation of bipartite entanglement. In particular, we show that the relative entropy of quantumness, which measures all non-classical correlations among subsystems of a quantum system, is equivalent to and can be operationally interpreted as the minimum distillable entanglement generated between the system and local ancillae in our protocol. We emphasize the key role of state mixedness in maximizing non-classicality: Mixed entangled states can be arbitrarily more non-classical than separable and pure entangled states.
description: 4+4 pages, 1 figure. Published version
Clearance, reinfection and re-clearance of hepatitis C
Creators: name: Islam, Nazrul
Publisher: name: University of British Columbia
Year: 2017

description: Purpose: Despite the availability of effective treatments for Hepatitis C virus (HCV) infection, public health experts face challenges to intervening effectively, in part due to gaps in understanding the natural history of HCV. To address these knowledge gaps, the current dissertation uses a large population-based cohort in British Columbia (BC), Canada, to examine spontaneous clearance, reinfection, and spontaneous clearance of reinfection (i.e., re-clearance) of HCV. Methods: This study draws data from the BC Hepatitis Testers Cohort that includes all individuals tested for HCV in BC (1990-2013), with linkages to data on their medical visits, hospitalizations, and prescription drugs. HCV-positive individuals with ≥1 valid HCV-PCR test on/after HCV diagnosis (n=46,783) were included, with varying eligibility criteria for each of the three primary analyses. Logistic regression and Cox proportional hazards regression models were used, as applicable. Results: The proportion of primary spontaneous clearance, reinfection, and re-clearance was 25.1% (11,737 of 46,783), 7.6% (452 of 5,915), and 33.9% (121 of 357), respectively. Chapter 2 shows that the likelihood of spontaneous clearance of primary HCV infection is lower in people with primary T-cell immunodeficiency (adjusted odds ratio [aOR]: 0.55, 95% CI: 0.32-0.94) and higher in females (aOR: 1.61, 95% CI: 1.54-1.68). Chapter 3 shows a higher reinfection risk in the spontaneous clearance group compared to sustained virological response group (adjusted Hazard Ratio [aHR]: 2.71, 95% CI: 2.0-3.68), those coinfected with HIV (aHR: 2.25, 95% CI: 1.78-2.85), and people who inject drugs [PWID] (aHR: 1.53, 95% CI: 1.21-1.92). Among PWID, opioid substitution therapy [OST] (aHR: 0.73, 95% CI: 0.54-0.98) and mental health counseling (aHR: 0.71, 95% CI: 0.54-0.92) were associated with a lower HCV reinfection risk. Chapter 4 shows that, among those who spontaneously cleared the primary infection, the likelihood of HCV re-clearance was 54% lower (aHR: 0.46, 95% CI: 0.24-0.86) if reinfected with a heterologous HCV genotype. Conclusions: People with compromised immunity may be prioritized for HCV treatment allocation. The positive impacts of scaled-up HCV treatment might be enhanced if accompanied by appropriate harm reduction programs to prevent reinfections among PWID with a view to achieving World Health Organization’s goal of HCV elimination.
Algorithms of Vision. Human and machine learning in computational visual culture
Creators: name: Maleve, Nicolas
Publisher: name: London South Bank University
Year: 2021

description: Current computer vision algorithms largely depend on the availability of images labelled by human annotators at very high speed. The mode of production of these annotations strongly resonates with an early experiment conducted in 2007 at Caltech by Fei Fei Li, initiator of ImageNet, one of the most popular visual datasets. In a laboratory, the subjects were asked to describe photographs shown for a few milliseconds and to filter them through a taxonomy. The Caltech experiment is used, in the thesis, to engage with the photographic elaboration of computer vision: the model of vision, the photographic alignments and the micro-temporal rhythm that subtend the modes of production of labelled data and the labour behind it. The written and practice components of the submission elaborate a novel method and document the path towards it. The method has developed in the context of practice-led research in collaboration with The Photographers' Gallery and crystallised into a project, Variations on a Glance, a series of re-enactments based on the Caltech experiment. The original experimental protocol is submitted to several variations, called re-experiments, exploring its potential to produce a time-critical model of vision and collective visual interpretations. The experimental protocol is re-designed iteratively to explore specific configurations of micro-temporal vision and different configurations of collectives of human and non-human participants. The thesis examines the dynamics of these collectives, in particular how they reach consensual interpretation, and how the taxonomic practices of the lab interfere in this process. The contribution of this research is a mapping of the entanglement of computer vision and photography and a method embedded in practice that does not attempt to resolve the differences and tensions between photography and computer vision but provides a device to explore the texture of their relation. The research complements and complicates the recent critiques related to bias and discrimination in machine learning and the exploitative work conditions it relies on. Finally it offers to the photographic institution and its public a mode of intervention into the making of computer vision.
Methodology from Spectral wear modelling of rubber friction on a hard substrate with large surface roughness
Creators: name: Tanaka, H.
name: Yanagihara, S.
name: Shiomi, K.
name: Kuroda, T.
name: Oku, Y.
Publisher: name: The Royal Society
Year: 2023
Subjects: classificationCode: 401799
subject: Mechanical engineering not elsewhere classified

description: The methodologies of the proposed work are written.
Boundary effects in the density-matrix renormalization group calculation
Creators: name: Shibata, Naokazu
name: Hotta, Chisa
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate the boundary effect of the density matrix renormalization group calculation (DMRG), which is an artifactual induction of symmetry-breaking pseudo-long-range order and takes place when the long-range quantum fluctuation cannot be properly included in the variational wave function due to numerical limitation. The open boundary condition often used in DMRG suffers from the boundary effect the most severely, which is directly reflected in the distinct spatial modulations of the local physical quantity. By contrast, the other boundary conditions such as the periodic one or the sin^2-deformed interaction [A. Gendiar, R. Krcmar, and T. Nishino, Prog. Theor. Phys. {\bf 122}, 953 (2009)] keep spatial homogeneity, and are relatively free from the boundary effect. By comparing the numerical results of those various boundary conditions, we show that the open boundary condition sometimes gives unreliable results even after the finite-size scaling. We conclude that the examination of the boundary condition dependence is required besides the usual treatment based on the system size or accuracy dependence in cases where the long-range quantum fluctuation is important.
description: 9 pages, 8 figures, to appear in PRB
Dynamics of Rotors on Refrigerant-Lubricated Gas Foil Bearings
Creators: name: Leister, Tim
Publisher: name: KIT Scientific Publishing
Year: 2021
Subjects: Bifurkationsanalyse
Fluidschmierung
Rotordynamik
Thermodynamik
Tribologie
Bifurcation Analysis
Fluid Film Lubrication
Rotor Dynamics
Thermodynamics
Tribology

description: The gas foil bearing (GFB) technology is a key factor for the transition to oil-free rotating machinery. Among numerous advantages, GFBs offer the unique ability to be lubricated with working fluids such as refrigerants. However, the computational analysis of refrigerant-lubricated GFB–rotor systems represents an interdisciplinary problem of enormous complexity. This work pushes forward existing limits of feasibility and establishes a new strategy that enables stability and bifurcation analyses.
Wspólna Polityka Bezpieczeństwa i Obrony UE w perspektywie teoretycznej, praktycznej i agencyjno-instytucjonlanej
Creators: name: Piechowicz, Michał
Publisher: name: figshare
Year: 2023
Subjects: European Union law

description: Artykuł ten analizuje ewolucję polityki bezpieczeństwa UE, czyli sfery, która była uznawana przez dziesięciolecia integracji za kompetencję państw członkowskich. Stąd rozwadze poddano z jednej strony mechanizmy zapewniające udział w procesach decyzyjnych organów reprezentujących interesy ponadnarodowe (tj. Komisja Europejska, Europejska Agencja Obrony, Komitet Polityczny i Bezpieczeństwa), przy jednoczesnej gwarancji decyzyjnej dla rządów państw członkowskich (m.in. w ramach Rady). W pierwszej części dyskusja dotyczy roli Traktatu w procesie kształtowania Wspólnej Polityki Bezpieczeństwa i Obrony (WPBiO) oraz dylematów dotyczących np. poszukiwania konsensusu negocjacyjnego, jak również znaczenia poziomu inwestycji w sferze bezpieczeństwa dla możliwości realizacji założonych celów. Następnie omówione są teoretyczne podstawy integracji omawianej polityki, oraz związane z tym wyzwania interpretacyjne. Trzecia część to analiza sfery instytucjonalno-agencyjnej związanej z zarządzaniem WPBiO, jak również mechanizmów decyzyjnych oraz źródeł finansowania podjętych działań i projektów. Dodatkowo, ukazana jest rola PESCO, czyli stałej współpracy strukturalnej, jako nowej koncepcji praktycznego realizowania założeń traktatowych i celów strategicznych UE w sferze bezpieczeństwa i obrony.
Black Hole Remnants in the Early Universe
Creators: name: Scardigli, Fabio
name: Gruber, Christine
name: Chen, Pisin
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We consider the production of primordial micro black holes (MBH) remnants in the early universe. These objects induce the universe to be in a matter-dominated era before the onset of inflation. Effects of such an epoch on the CMB power spectrum are discussed and computed both analytically and numerically. By comparison with the latest observational data from the WMAP collaboration, we find that our model is able to explain the quadrupole anomaly of the CMB power spectrum.
description: 31 pages, 24 figures, revtex4. Some references added, some minor changes
Generalized quasi-Einstein manifolds with harmonic Weyl tensor
Creators: name: Catino, Giovanni
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: In this paper we introduce the notion of generalized quasi--Einstein manifold, that generalizes the concepts of Ricci soliton, Ricci almost soliton and quasi--Einstein manifolds. We prove that a complete generalized quasi--Einstein manifold with harmonic Weyl tensor and with zero radial Weyl curvature, is locally a warped product with $(n-1)$--dimensional Einstein fibers. In particular, this implies a local characterization for locally conformally flat gradient Ricci almost solitons, similar to that proved for gradient Ricci solitons.
Renyi Entropy and Parity Oscillations of the Anisotropic Spin-s Heisenberg Chains in a Magnetic Field
Creators: name: Xavier, J. C.
name: Alcaraz, F. C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Using the density matrix renormalization group, we investigate the Renyi entropy of the anisotropic spin-s Heisenberg chains in a z-magnetic field. We considered the half-odd integer spin-s chains, with s=1/2,3/2 and 5/2, and periodic and open boundary conditions. In the case of the spin-1/2 chain we were able to obtain accurate estimates of the new parity exponents $p_α^{(p)}$ and $p_α^{(o)}$ that gives the power-law decay of the oscillations of the $α-$Renyi entropy for periodic and open boundary conditions, respectively. We confirm the relations of these exponents with the Luttinger parameter $K$, as proposed by Calabrese et al. [Phys. Rev. Lett. 104, 095701 (2010)]. Moreover, the predicted periodicity of the oscillating term was also observed for some non-zero values of the magnetization $m$. We show that for $s>1/2$ the amplitudes of the oscillations are quite small, and get accurate estimates of $p_α^{(p)}$ and $p_α^{(o)}$ become a challenge. Although our estimates of the new universal exponents $p_α^{(p)}$ and $p_α^{(o)}$ for the spin-3/2 chain are not so accurate, they are consistent with the theoretical predictions.
description: revised version, accepted to PRB. 9 pages, 3 Figures, 4 Tables
High Dimensional Sparse Econometric Models: An Introduction
Creators: name: Belloni, Alexandre
name: Chernozhukov, Victor
Publisher: name: arXiv
Year: 2011
Subjects: subject: Applications (stat.AP)
subject: Econometrics (econ.EM)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: FOS: Economics and business

description: In this chapter we discuss conceptually high dimensional sparse econometric models as well as estimation of these models using L1-penalization and post-L1-penalization methods. Focusing on linear and nonparametric regression frameworks, we discuss various econometric examples, present basic theoretical results, and illustrate the concepts and methods with Monte Carlo simulations and an empirical application. In the application, we examine and confirm the empirical validity of the Solow-Swan model for international economic growth.