cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Non-classicality of bright GHZ-like radiation of an optical parametric source
Creators: name: Schlichtholz, Konrad
name: Woloncewicz, Bianka
name: Żukowski, Marek
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: With the emerging possibility to obtain emissions of triples of GHZ-entangled photons via a direct parametric generation we study here bright emissions of this kind which involve higher order emissions of two triples, three triples, etc. Such states would constitute a natural generalization of the four mode (two beams plus polarization) squeezed vacuum. We have three beam process of emission generalized bright GHZ states, which a are superpositions of one, two, three, and so on GHZ entangled triples of photons. We show how to avoid technical difficulties related with straight ahead generalization of the usual description of parametric down conversion. Using Pade approximation we turn first terms of the non-converging perturbation expansion into elements of conversing series. This allows us to study non-classicality of the new bright generalized GHZ states.
description: 16 pages, 5 figures
Electronic Phase Separation in Manganite/Insulator Interfaces
Creators: name: Brey, Luis
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: By using a realist microscopic model, we study the electric and magnetic properties of the interface between a half metallic manganite and an insulator. We find that the lack of carriers at the interface debilitates the double exchange mechanism, weakening the ferromagnetic coupling between the Mn ions. In this situation the ferromagnetic order of the Mn spins near the interface is unstable against antiferromagnetic CE correlations, and a separation between ferromagnetic/metallic and antiferromagnetic/insulator phases at the interfaces can occur. We obtain that the insertion of extra layers of undoped manganite at the interface introduces extra carriers which reinforce the double exchange mechanism and suppress antiferromagnetic instabilities.
description: 8 pages, 7 figures included
EDGELESS D4.1: Initial platform services
Creators: name: Cicconetti, Claudio
Publisher: name: Zenodo
Year: 2024

description: This document complements the release of two initial software prototypes developed by the partners of project EDGELESS for the fulfillment of D4.1 Initial platform services. The first one, called legacy prototype, is the result of an integration effort to combine multiple sites, each hosting an open-source serverless computing platform, namely faasd, through an open-source middleware that handles the dispatch of function invocations to create more complex workflows (ServerlessOnEdge). The second prototype, called minimum viable product, is a baseline implementation (coded using Rust programming language) of the key EDGELESS components, i.e., ε-CON, ε-ORC, and ε-BAL, which also materializes four of the interfaces defined as part of the current EDGELESS architecture: the event management API (s01) and the interfacesfor managing the lifecycle of the workflows (s04), external sources/sinks (s06), and function instance (s07).The requirements coverage matrix of both software prototypes with respect to the requirements collected in the project's initial phase are also included. The prototypes are available in public code repositories within the EDGELESS GitHub project.
Analogies minus analogy test: measuring regularities in word embeddings
Creators: name: Fournier, Louis
name: Dupoux, Emmanuel
name: Dunbar, Ewan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Vector space models of words have long been claimed to capture linguistic regularities as simple vector translations, but problems have been raised with this claim. We decompose and empirically analyze the classic arithmetic word analogy test, to motivate two new metrics that address the issues with the standard test, and which distinguish between class-wise offset concentration (similar directions between pairs of words drawn from different broad classes, such as France--London, China--Ottawa, ...) and pairing consistency (the existence of a regular transformation between correctly-matched pairs such as France:Paris::China:Beijing). We show that, while the standard analogy test is flawed, several popular word embeddings do nevertheless encode linguistic regularities.
title: The Ingestion of microplastic by commercially important marine species from Ireland
Creators: name: Lusher, Amy
name: O’Connor, Ian
name: Officer, Rick
Publisher: name: ASC 2013 - Theme session A
Year: 2024
Subjects: The sea and human culture and societies
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. Microplastics, or synthetic particles < 5 mm(1) enter the marine environment through direct input of small particles and fragmentation. Microplastics are found throughout the water column and in sediments and are available for interaction with marine organisms
The effects of prenatal ethanol exposure and stress in adulthood on the endocrine and immune systems in rats
Creators: name: Gabriel, Kara Irene
Publisher: name: University of British Columbia
Year: 2009

description: The two studies in this thesis were undertaken to examine the possible interactive effects of prenatal ethanol exposure and exposure to chronic stress in adulthood on hypothalamic-pituitary-adrenal (HPA), hypothalamic-pituitary-gonadal (HPG) and immune measures. Male and female offspring from prenatal ethanol-exposed (E), pair-fed (PF) and ad libitum-fed control (C) conditions were exposed to varying lengths of a chronic intermittent stress regimen in adulthood. Animals were exposed daily to 2 of 6 different stressors, one each at random times in the morning and afternoon, with the same pair of stressors being repeated every 4 days. In the first study, following either 6 d or 18 d of chronic stress, CORT and ACTH levels, body weights, adrenal weights and gonadal weights as well as thymus and spleen cell counts were measured. In the second study, following 21 d of chronic stress, body weights and adrenal weights as well as splenic lymphocyte proliferative responses to three different mitogens (Con A , PWM, LPS) were assessed. The data demonstrate that although E, PF and C animals did not significantly differ in pituitary-adrenal activity, body and organ weights, or immune cell counts, there were effects of prenatal ethanol exposure of lymphocyte proliferative responses to Con A and PWM in males and to PWM in females. In addition, there were nutritionally-mediated effects of ethanol and effects of pair-feeding on lymphocyte proliferative responses in females The chronic stress regimen used in these studies produced effects on CORT and ACTH levels, body and organ weights as well as immune cell counts in males. For females, chronic stress affected immune cell counts in the first study and lymphocyte proliferative responses to mitogens in the second study. Together, these findings indicate that, although exposure to chronic intermittent stress in adulthood may have marked effects on the endocrine and immune systems in adulthood, specific effects on the immune system of E animals may only become apparent when these animals are exposed to chronic stress. In addition, male and female offspring are differentially affected by prenatal ethanol exposure and exposure to chronic stress in adulthood.
title: Marine litter in trawl catched from the deep bottoms of the southeastern Ionian and Messiniakos Gulf
Creators: name: Mytilineou, Ch.
name: Anastasopoulou, A.
name: Kavadas, S.
Publisher: name: ASC 2013 - Theme session A
Year: 2024
Subjects: The sea and human culture and societies
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. Anthropogenic litter caught during experimental trawl fishing surveys, carried out on the deep bottoms of the Southeastern Ionian (S.E.I.) and the Messiniakos Gulf (M.S.) during September 2000, was studied based on the photos of 58 hauls (41 in S.E.I. & 17 in M.G.)
On the analysis of the vibrational Boson peak and low-energy excitations in glasses
Creators: name: Yannopoulos, S. N.
name: Andrikopoulos, K. S.
name: Ruocco, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Implications of reduction procedures applied to the low energy part of the vibrational density of states in glasses and supercooled liquids are considered by advancing a detailed comparison between the excess - over the Debye limit - vibrational density of states g(w) and the frequency-reduced representation g(w)/w^2 usually referred to as the Boson peak. Analyzing representative experimental data from inelastic neutron and Raman scattering we show that reduction procedures distort to a great extent the otherwise symmetric excess density of states. The frequency of the maximum and the intensity of the excess experience dramatic changes; the former is reduced while the latter increases. The frequency and the intensity of the Boson peak are also sensitive to the distribution of the excess. In the light of the critical appraisal between the two forms of the density of states (i.e. the excess and the frequency-reduced one) we discuss changes of the Boson peak spectral features that are induced under the presence of external stimuli such as temperature (quenching rate, annealing), pressure, and irradiation. The majority of the Boson peak changes induced by the presence of those stimuli can be reasonably traced back to simple and expected modifications of the excess density of states and can be quite satisfactorily accounted for the Euclidean random matrix theory. Parallels to the heat capacity Boson peak are also briefly discussed.
description: To appear in J. Non-Cryst. Solids (Proceedings of the 5th IDMRCS, Lille, July 2005)
Ο συντελεστής μεταβλητότητας και η συμβολή του στη μελέτη των κατανομών:
Creators: name: Τομπούδης, Γεώργιος Σγουράδη
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Συντελεστής Μεταβλητότητας
Δειγματοληψία
Άυξουσα και συμμετρική κατανομή

description: Στην εργασία αυτή θα ασχοληθούμε με τον συντελεστή μεταβλητότητας Cv σε μία προσπάθεια να αναδείξουμε την συμβολή του στη μελέτη των κατανομών και συγκεκριμένα των αυξουσών και των συμμετρικών. Αρχικά, στο Κεφάλαιο 1 παρουσιάζουμε τις βασικές μεθόδους δειγματοληψίας και σε κάποιες από αυτές αναφέρουμε ενδεικτικά και κάποιους από τους εκτιμητές τους. Στο Κεφάλαιο 2 ορίζουμε τον συντελεστή μεταβλητότητας Cv, το υπόβαθρο του και τον τρόπο που εκτιμάται από ένα δείγμα, κάνουμε τον διαχωρισμό του Cv σε σταθμισμένο και αστάθμητο και αναφέρουμε τους τύπους του καθένα αλλά και σε ποιες περιπτώσεις εφαρμόζονται και κλείνουμε αναφέροντας κάποιες εφαρμογές του Cv καθώς και την συμβολή του σε άλλες επιστήμες. Στην συνέχεια, στο Κεφάλαιο 3 παρουσιάζουμε τους ορισμούς της συνάρτησης κατανομής, της απόλυτα συνεχούς συνάρτησης και της συνάρτησης πυκνότητας πιθανότητας (σ.π.π.) καθώς και κάποιες ιδιότητες αυτών. Επιπλέον, μελετούμε τις σ.π.π. με συμμετρική και αύξουσα φύση και δείχνουμε πως μπορούμε να υπολογίσουμε τις συγκεκριμένες σ.π.π. με την βοήθεια του Cv. Φυσικά δεν θα μπορούσαν να λείπουν και τα παραδείγματα για την καλύτερη κατανόηση της θεωρίας. Τέλος, ακολουθεί μία ΄΄συζήτηση΄΄, όπου παρατίθενται κάποιες παρατηρήσεις τις οποίες κάνουμε μετά την μελέτη των παραπάνω.
description: At this project we study the Coefficient of Variation, denoted by Cv and we try to highlight its contribution to the study of distributions namely the ascending and symmetric. First, Chapter 1 presents the basic methods of Sampling and in some cases we refer to some of their estimators. Chapter 2 defines the Coefficient of Variation, its background and the way it is estimated from a sample, distinguishing Cv in weighted and unweighted and presents their types. In the sequel, Chapter 3 presents the definitions of the distribution function, the continuous absolute function and the probability density function (p.d.f.), as well as some of their properties. Furthermore, we study the p.d.f. with symmetric and increasing ΄΄nature΄΄ and show how we can calculate these p.d.fs with the contribution of the Cv. In addition, we present some examples that help us in understanding the theory. Finally, after completing our study, we point out some general comments in the form of a ΄΄discussion΄΄.
Interface-Driven Thermo-Electric Switching Performance of VO$^+$ Diffused Soda-Lime Glass
Creators: name: Esther, A. Carmel Mary
name: Muralikrishna, G. Mohan
name: Tyler, Bonnie J.
name: Arlinghaus, Heinrich F.
name: Divinski, Sergiy V.
name: Wilde, Gerhard
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Strongly confined NaVO$^+$ segregation and its thermo-responsive functionality at the interface between simple sputter-deposited amorphous vanadium oxide thin films and soda-lime glass was substantiated in the present study by in-situ temperature-controlled Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS). The obtained ToF-SIMS depth profiles provided unambiguous evidence for a reversible transformation that caused systematic switching of the NaVO$^+$/ Na$^+$ and Na$^+$/ VO$^+$ intensities upon cycling the temperature between 25 $^\circ$C and 340 $^\circ$C. Subsequently, NaVO complexes were found to be reversibly formed (at 300 $^\circ$C) in vanadium oxide diffused glass, leading to thermo-responsive electrical behaviour of the thin film glass system. This new segregation -- and diffusion-dependent multifunctionality of NaVO$^+$ -- points towards applications as an advanced material for thermo-optical switches, in smart windows or in thermal sensors.
title: Fisheries impact on Central Baltic Sea fish stocks and ecosystem during the 20th Century – preliminary results
Creators: name: Tomczak, T. M.
name: Eero, M.
name: Sundberg, J.
name: MacKenzie, R. B.
name: Mueller-Karulis, B.
name: Gustafson, B.
name: Otto, S.
Publisher: name: ASC 2013 - Theme session B
Year: 2024
Subjects: The sea and human culture and societies
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. Rapid developments in fishing technology, intensive hunting of seals and increased nutrient inputs into the Baltic led to large-scale changes in Baltic ecosystem structure and dynamics during the 20th century. The information on long-term changes in fleet structure, effort, catches, species abundances, and interactions varies in quality and depends on the length of the time-series. In this paper we compile and model the available historical information on catches (Hammer et al., 2008.), biomasses (Eero et al., 2007; Eero et al.,2008), diet composition, productivity changes, and fisheries into a series of mass-balance ecosystem model (Ecopath) for contrasting periods from 1920s till 1970s. To reflect long-term changes in system productivity, reconstruction based on coupled models NEST system was used (Gustafson at al., 2012). Using fisheries related indices we explore the impact of fisheries in the Baltic fish stocks as well as lower TL and entire ecosystem structure at different time-periods during the 20th century and discus in light of reconstructed climate and hydrology
Group theoretical approach to quantum fields in de Sitter space I. The principal series
Creators: name: Joung, E.
name: Mourad, J.
name: Parentani, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using unitary irreducible representations of the de Sitter group, we construct the Fock space of a massive free scalar field. In this approach, the vacuum is the unique dS invariant state. The quantum field is a posteriori defined by an operator subject to covariant transformations under the dS isometry group. This insures that it obeys canonical commutation relations, up to an overall factor which should not vanish as it fixes the value of hbar. However, contrary to what is obtained for the Poincare group, the covariance condition leaves an arbitrariness in the definition of the field. This arbitrariness allows to recover the amplitudes governing spontaneous pair creation processes, as well as the class of alpha vacua obtained in the usual field theoretical approach. The two approaches can be formally related by introducing a squeezing operator which acts on the state in the field theoretical description and on the operator in the present treatment. The choice of the different dS invariant schemes (different alpha vacua) is here posed in very simple terms: it is related to a first order differential equation which is singular on the horizon and whose general solution is therefore characterized by the amplitude on either side of the horizon. Our algebraic approach offers a new method to define quantum field theory on some deformations of dS space.
description: 35 pages, 2 figures ; Corrected typo, Changed reference
Dual-Polarized All-Metallic Metagratings for Perfect Anomalous Reflection
Creators: name: Rabinovich, Oshri
name: Epstein, Ariel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We theoretically formulate and experimentally demonstrate the design of metagratings (MGs) composed of periodic rectangular grooves in a metallic medium, intended for perfect anomalous reflection. Using mode matching, a semianalytical scheme for analysis and synthesis of such MGs, containing multiple, arbitrarily arranged, grooves per period, is derived. Following the typical MG design approach, we use this formalism to identify the relevant Floquet-Bloch (FB) modes and conveniently formulate constraints for suppression of spurious scattering, directly tying the structure's geometrical degrees of freedom (DOFs) to the desired functionality. Solving this set of constraints, in turn, yields a detailed fabrication-ready MG design, without any full-wave optimization. Besides providing means to realize highly-efficient beam deflection with all-metallic formations, we show that the rectangular (two-dimensional) groove configuration enables \emph{simultaneous} manipulation of both transverse electric (TE) and transverse magnetic (TM) polarized fields, unavailable to date with common, printed-circuit-board-based, microwave MGs. In addition, we highlight a physical limitation on the TE-polarization performance, preventing the ability to achieve perfect anomalous reflection in any desired angle. These capabilities are verified using three MG prototypes, produced with standard computer numerical control (CNC) machines, demonstrating both single- and dual-polarized control of multiple diffraction modes. These results enable the use of MGs for a broader range of applications, where dual-polarized control is required, or all-metallic devices are preferable (e.g., spaceborne systems or at high operating frequencies).
description: 16 pages, 16 figures
Ποιοτικά χαρακτηριστικά ροδακίνων ολοκληρωμένης και βιολογικής καλλιέργειας:
Creators: name: Μπουχάρα, Ελένη Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Ποιοτικά χαρακτηριστικά
Αντιοξειδωτικά
Βιολογική καλλιέργεια, ολοκληρωμένη
Organic
Integrated
Quality characteristics

description: Τα εναλλακτικά καλλιεργητικά συστήματα κερδίζουν έδαφος συνεχώς, στη θέση των συμβατικών αλλά έχουν διαφορές στα ποιοτικά χαρακτηριστικά. Αξιολογήθηκαν ροδακίνα της ποικιλίας Royal Glory, τα οποία συγκομίστηκαν ταυτόχρονα με την 2η συγκομιδή του παραγωγού από 2 γειτονικούς οπωρώνες της περιοχής Βελβεντού Κοζάνης, στους οποίους εφαρμόστηκαν δύο εναλλακτικά συστήματα παραγωγής, τα συστήματα της ολοκληρωμένης διαχείρισης και της βιολογικής καλλιέργειας. Τα ροδάκινα συντηρήθηκαν στους 0-2o C για 0, 1, 2, 3, 4 εβδομάδες και αξιολογήθηκαν στη συγκομιδή και την 1η και 4η μέρα παραμονής τους σε θερμοκρασία δωματίου. Τα ροδάκινα της βιολογικής καλλιέργειας είχαν μεγαλύτερη περιεκτικότητα σε φαινολικές ουσίες, συνολική αντιοξειδωτική ικανότητα και φλαβονοειδή σε σχέση με τα ροδάκινα της ολοκληρωμένης. Όμως τα ροδάκινα της βιολογικής καλλιέργειας είναι κάπως πιο ευαίσθητα και πάνε κατευθείαν για πώληση.
description: Alternative cultivation systems are gaining ground, in the place of conventional ones and try to answer the question if they have differences in quality characteristics. The post harvest quality of Royal Glory peaches harvested from the integrated IFP and organic farming evaluated, over a season. The peaches were harvested at the 2nd hand from 2 nearby orchards close to Velvento Kozanis and stored at 0-2o C for 0, 1, 2, 3, 4 weeks. The peaches were evaluated a harvest, at 1 and 4 day at 25o C. The peaches from organic farming have more phenols, total antioxidant capacity and flavonoids than the peaches from IFP. But the peaches from organic farming are a little more sensitive and go to the market immediately.
title: Historical diets, food web dynamics and climate change in the Arctic
Creators: name: Townhill, Bryony L.
name: Pinnegar, John K.
Publisher: name: ASC 2013 - Theme session B
Year: 2024
Subjects: The sea and human culture and societies
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. Atlantic cod Gadus morhua stocks in the Barents Sea are currently at levels not seen since the 1950s, however it is unclear how these very high population numbers can be supported in terms of prey availability and whether high cod numbers will have consequences for other important commercial fish. Cefas are carrying out analysis of datasets for the Bear Island (Spitsbergen) region between the 1930s and 1970s. Initial analysis of stomach data in the region has shown that cod diets have varied considerably over recent decades. Developing an understanding of historical food web dynamics, and in particular relationships between climatic conditions and diet, can enable predictions of how future changes might impact fisheries. This study is placing changes in cod diet in a long-term context of both warming and cooling periods, changes in fishing mortality as well as changes in the availability of particular prey organisms. As the Arctic is highly sensitive to climate change, but is also fished by many nations, the results of this project are directly relevant to future management of cod stocks.
title: Dill :
title: Guidelines for the Conduct of Tests for Distinctness, Uniformity and Stability.
titleType: Subtitle
Creators: name: International Union For The Protection Of New Varieties Of Plants,
Publisher: name: International Union for the Protection of New Varieties of Plants,
Year: 0
Subjects: Dill
Group identity.
New Varieties of Plants

description: The purpose of these guidelines (“Test Guidelines”) is to elaborate the principles contained in the General Introduction (document TG/1/3), and its associated TGP documents, into detailed practical guidance for the harmonized examination of distinctness, uniformity and stability (DUS) and, in particular, to identify appropriate characteristics for the examination of DUS and production of harmonized variety descriptions.
SCUBA-2: a 10,000 pixel submillimeter camera for the James Clerk Maxwell Telescope
Creators: name: Holland, Wayne
name: MacIntosh, Michael
name: Fairley, Alasdair
name: Kelly, Dennis
name: Montgomery, David
name: Gostick, David
name: Atad-Ettedgui, Eli
name: Ellis, Maureen
name: Robson, Ian
name: Hollister, Matthew
name: Woodcraft, Adam
name: Ade, Peter
name: Walker, Ian
name: Irwin, Kent
name: Hilton, Gene
name: Duncan, William
name: Reintsema, Carl
name: Walton, Anthony
name: Parkes, William
name: Dunare, Camelia
name: Fich, Michel
name: Kycia, Jan
name: Halpern, Mark
name: Scott, Douglas
name: Gibb, Andy
name: Molnar, Janos
name: Chapin, Ed
name: Bintley, Dan
name: Craig, Simon
name: Chylek, Tomas
name: Jenness, Tim
name: Economou, Frossie
name: Davis, Gary
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: SCUBA-2 is an innovative 10,000 pixel submillimeter camera due to be delivered to the James Clerk Maxwell Telescope in late 2006. The camera is expected to revolutionize submillimeter astronomy in terms of the ability to carry out wide-field surveys to unprecedented depths addressing key questions relating to the origins of galaxies, stars and planets. This paper presents an update on the project with particular emphasis on the laboratory commissioning of the instrument. The assembly and integration will be described as well as the measured thermal performance of the instrument. A summary of the performance results will be presented from the TES bolometer arrays, which come complete with in-focal plane SQUID amplifiers and multiplexed readouts, and are cooled to 100mK by a liquid cryogen-free dilution refrigerator. Considerable emphasis has also been placed on the operating modes of the instrument and the common-user aspect of the user interface and data reduction pipeline. These areas will also be described in the paper.
description: 15 pages; in Proceedings of Millimeter and Submillimeter Detectors and Instrumentation, SPIE, in press
title: Impact of projected wind and temperature changes on larval recruitment of sole in the Southern North Sea
Creators: name: Lacroix, Geneviève
name: Van der Zande, Dimitry
name: Maes, Gregory E.
name: Volckaert, Filip A.M.
Publisher: name: ASC 2013 - Theme session B
Year: 2024
Subjects: The sea and human culture and societies
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. The impact of climate change on larval dispersal remains poorly known. The case of sole (Solea solea) is of particular interest because it is one of the most valuable commercial species in the North Sea. We compare scenarios of a particle‐tracking transport model for sole larvae coupled to a 3D hydrodynamic model to investigate the impact of climate change on larval dispersal and recruitment at nurseries through hypothetical sea surface temperature increase and wind regime change for two years (2005 and 2006) in the North Sea.
Topological Data Analysis for Portfolio Management of Cryptocurrencies
Creators: name: Rivera-Castro, Rodrigo
name: Pilyugina, Polina
name: Burnaev, Evgeny
Publisher: name: arXiv
Year: 2020
Subjects: subject: Portfolio Management (q-fin.PM)
subject: Machine Learning (cs.LG)
subject: Statistical Finance (q-fin.ST)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences

description: Portfolio management is essential for any investment decision. Yet, traditional methods in the literature are ill-suited for the characteristics and dynamics of cryptocurrencies. This work presents a method to build an investment portfolio consisting of more than 1500 cryptocurrencies covering 6 years of market data. It is centred around Topological Data Analysis (TDA), a recent approach to analyze data sets from the perspective of their topological structure. This publication proposes a system combining persistence landscapes to identify suitable investment opportunities in cryptocurrencies. Using a novel and comprehensive data set of cryptocurrency prices, this research shows that the proposed system enables analysts to outperform a classic method from the literature without requiring any feature engineering or domain knowledge in TDA. This work thus introduces TDA-based portfolio management of cryptocurrencies as a viable tool for the practitioner.
Parallel MRI at microtesla fields
Creators: name: Zotev, V. S.
name: Volegov, P. L.
name: Matlashov, A. N.
name: Espy, M. A.
name: Mosher, J. C.
name: Kraus, R. H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Medical Physics (physics.med-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Parallel imaging techniques have been widely used in high-field magnetic resonance imaging (MRI). Multiple receiver coils have been shown to improve image quality and allow accelerated image acquisition. Magnetic resonance imaging at ultra-low fields (ULF MRI) is a new imaging approach that uses SQUID (superconducting quantum interference device) sensors to measure the spatially encoded precession of pre-polarized nuclear spin populations at microtesla-range measurement fields. In this work, parallel imaging at microtesla fields is systematically studied for the first time. A seven-channel SQUID system, designed for both ULF MRI and magnetoencephalography (MEG), is used to acquire 3D images of a human hand, as well as 2D images of a large water phantom. The imaging is performed at 46 microtesla measurement field with pre-polarization at 40 mT. It is shown how the use of seven channels increases imaging field of view and improves signal-to-noise ratio for the hand images. A simple procedure for approximate correction of concomitant gradient artifacts is described. Noise propagation is analyzed experimentally, and the main source of correlated noise is identified. Accelerated imaging based on one-dimensional undersampling and 1D SENSE (sensitivity encoding) image reconstruction is studied in the case of the 2D phantom. Actual 3-fold imaging acceleration in comparison to single-average fully encoded Fourier imaging is demonstrated. These results show that parallel imaging methods are efficient in ULF MRI, and that imaging performance of SQUID-based instruments improves substantially as the number of channels is increased.
description: 12 pages, 7 figures - accepted by JMR
Structure and dynamics of responsive colloids with dynamical polydispersity
Creators: name: Baul, Upayan
name: Dzubiella, Joachim
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Dynamical polydispersity in single-particle properties, for example a fluctuating particle size, shape, charge density, etc., is intrinsic to responsive colloids (RCs), such as biomacromolecules or microgels, but is typically not resolved in coarse-grained mesoscale simulations. Here, we present Brownian Dynamics (BD) simulations of suspensions of RCs modeling soft hydrogel colloids, for which the size of the individual particles is an explicitly resolved (Gaussian) degree of freedom and dynamically responds to the local interacting environment. We calculate the liquid structure, emergent size distributions, long-time diffusion, and property (size) relaxation kinetics for a wide range of densities and intrinsic property relaxation times in the canonical ensemble. Comparison to interesting reference cases, such as conventional polydisperse suspensions with a frozen parent distribution, or conventional monodisperse systems interacting with an effective pair potential for one fixed size, shows a significant spread in the structure and dynamics. The differences, most apparent in the high density regimes, are due to many-body correlations and the dynamical coupling between property and translation in RC systems, not explicitly accounted for in the conventional treatments. In particular, the translational diffusion in the RC systems is surprisingly close to the free (single RC) diffusion, mainly due to a cancellation of crowding and size compression effects. We show that an effective monodisperse pair potential can be constructed that describes the many-body correlations reasonably well by convoluting the RC pair potential with the density-dependent emergent size distributions and using a mean effective diffusion constant.
description: 26 pages, 7 figures
Finite element modeling of extraordinary optoconductance in GaAs-In metal-semiconductor hybrid structures
Creators: name: Wieland, K. A.
name: Wang, Yun
name: Solin, S. A.
name: Girgis, A. M.
name: Ram-Mohan, L. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a detailed discussion of extraordinary optoconductance (EOC). Experimental data was acquired via macroscopic metal-semiconductor hybrid structures composed of GaAs and In and subjected to illumination from an Ar ion laser. A drift diffusion model using the finite element method (FEM) provided a reasonable fit to the data. EOC is explored as a function of laser position, bias current, laser power density, and temperature. The positional dependence of the voltage is accounted for by the Dember effect, with the model incorporating the excess hole distribution based on the carrier mobility, and thus the mean free path. The bias current is found to produce a linear voltage offset and does not influence the EOC. A linear relationship is found between the laser power density and the voltage in the bare and hybrid devices. This dependence is reproduced in the model by a generation rate parameter which is related to the power density. Incorporating the mobility and diffusion temperature dependence, the model directly parallels the temperature dependence of the EOC without the use of fitting parameters.
description: 8 Pages, 7 figures; More detailed title, typos fixed, figures fixed
Probing topological spin structures using light-polarization and magnetic microscopy
Creators: name: Lenz, Till
name: Chatzidrosos, Georgios
name: Wang, Zhiyuan
name: Bougas, Lykourgos
name: Dumeige, Yannick
name: Wickenbrock, Arne
name: Kerber, Nico
name: Zázvorka, Jakub
name: Kammerbauer, Fabian
name: Kläui, Mathias
name: Kazi, Zeeshawn
name: Fu, Kai-Mei C.
name: Itoh, Kohei
name: Watanabe, Hideyuki
name: Budker, Dmitry
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We present an imaging modality that enables detection of magnetic moments and their resulting stray magnetic fields. We use wide-field magnetic imaging that employs a diamond-based magnetometer and has combined magneto-optic detection (e.g. magneto-optic Kerr effect) capabilities. We employ such an instrument to image magnetic (stripe) domains in multilayered ferromagnetic structures.
description: 7 pages
Low-energy electrodynamics of superconducting diamond
Creators: name: Ortolani, M.
name: Lupi, S.
name: Baldassarre, L.
name: Calvani, P.
name: Schade, U.
name: Takano, Y.
name: Nagao, M.
name: Takenouchi, T.
name: Kawarada, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Heavily-boron-doped diamond films become superconducting with critical temperatures $T_c$ well above 4 K. Here we first measure the reflectivity of such a film down to 5 cm$^{-1}$, by also using Coherent Synchrotron Radiation. We thus determine the optical gap, the field penetration depth, the range of action of the Ferrell-Glover-Tinkham sum rule, and the electron-phonon spectral function. We conclude that diamond behaves as a dirty BCS superconductor.
description: 4 pages including 3 figures
title: Towards the dominance of Boreal zooplankton in the European Arctic?
Creators: name: Weydmann, Agata
name: Carstensen, Jacob
name: Goszczko, Ilona
name: Dmoch, Katarzyna
name: Olszewska, Anna
name: Kwasniewski, Slawomir
Publisher: name: ASC 2013 - Theme session B
Year: 2024
Subjects: The sea and human culture and societies
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. We studied summer mesozooplankton composition between 2001 and 2009, in the epipelagic zone of the West Spitsbergen Current (WSC) and adjacent areas, which constitute a transition zone between warmer Atlantic and cold Arctic waters. The novel spatial analysis method of principal coordinates of neighbour matrices (PCNM) and the following variation partitioning, were applied to disentangle the contributions of environmental variables and spatial differences in explaining zooplankton variation. In spite of the large geographical area covered, environmental factors explained 30.6% of zooplankton variability, while the spatial distribution of sampling stations was responsible for 27.2%, whereas 12.5% was a common share of both predictors, coming from their correlations. We observed a gradual transition from dominance of ubiquitous and Boreo-Arctic species towards increasing contribution of Boreal ones such as Calanus finmarchicus.
Stop-and-go locomotion of superwalking droplets
Creators: name: Valani, Rahil N.
name: Slim, Anja C.
name: Simula, Tapio P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Vertically vibrating a liquid bath at two frequencies, $f$ and $f/2$, having a relative phase difference $Δϕ_0$ can give rise to self-propelled superwalking droplets on the liquid surface. We have numerically investigated such superwalking droplets with the two driving frequencies slightly detuned, resulting in the phase difference $Δϕ(t)$ varying linearly with time. We predict the emergence of stop-and-go motion of droplets, consistent with experimental observations [Valani et al. Phys. Rev. Lett. {\bf 123}, 024503 (2019)]. Our simulations in the parameter space spanned by the droplet size and the rate of traversal of the phase difference uncover three different types of droplet motion: back-and-forth, forth-and-forth, and irregular stop-and-go motion. Our findings lay a foundation for further studies of dynamically driven droplets, whereby the droplet's motion may be guided by engineering arbitrary time-dependent functions $Δϕ(t)$.
description: 13 pages, 8 figures
Traplining foraging behavior in a tropical hummingbird species phaethornis superciliosus
Creators: name: Garrison, Jennifer Susan Eileen
Publisher: name: University of British Columbia
Year: 2009

description: Traplining nectarivores are those that visit widely dispersed and often nectarrich flowers that cannot be directly defended and are thought to follow similar routes on different foraging bouts. Phaethornis superciliosus is a large (6 g) hummingbird found in the lowland tropical forests of Central and South America, and is considered a preeminent example of a traplining hummingbird. Though P. superciliosus is considered a trapliner, no detailed studies of its movements have confirmed this. Through field observations and enclosure experiments on P. superciliosus, I examined whether they followed similar routes on different foraging bouts, and considered some factors which could affect their visitation rates to patches of flowers. In the field, birds' arrival and departure angles to/from a patch were quite similar over one to several days, and different birds used different arrival and departure directions from the same patch. This supports the idea that they were following routes, and that these routes were based on the locations of patches of flowers, rather than on open flyways through the forest. Both my field and enclosure studies suggest that P. superciliosus can detect and respond to changes in nectar production rates at individual patches along their traplines. Birds in the enclosure increased or decreased relative use of feeders when I manipulated their nectar production rates. Because traplining birds do not defend their flowers from competitors, they should respond to competition by returning sooner to flowers visited by other nectarivores (exploitative defense). In my field study, I observed a positive relationship between how long a bird waited between visits to a patch and the number of competitive visits by other birds to the patch. There was a positive relationship between the amount of nectar removed from the feeder and birds' relative use of the feeder, indicating that birds do respond to competition. The currently accepted model of constant net energy intake by territorial hummingbirds does not accurately reflect feeding behavior of traplining birds. P. superciliosus has a gross nectar intake that decreases through the day, mirroring nectar production rates in its food-flowers. I present a simulation model in which trapliners have decreasing rather than constant net energy intake rates. Model birds with decreasing net intake rates can meet their energetic needs with fewer flowers than model birds with constant net intake.
Short-range Three-Nucleon Forces Effects on Nucleon-Deuteron Scattering
Creators: name: Ishikawa, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Effects of three-nucleon forces arising from the exchange of a pion and a scalar-isoscalar object among three nucleons on nucleon-deuteron scattering observables are studied.
description: 4 pages, 5 eps figures, talk given at the "18th International IUPAP Conference on Few-Body Problems in Physics" Santos, Sao Paulo, Brazil, August 21-26, 2006
Toward an integrated model of supportive peer relationships in early adolescence: A systematic review and exploratory meta-analysis (supplemental materials)
Creators: name: Mitic, Marija
Publisher: name: figshare
Year: 2021
Subjects: subject: 111714 Mental Health
subject: FOS: Health sciences

description: The archive comprise following materials:
A. Supplementary tables (ST)- Table 1 – Characteristics of included studies (.xlsx)- Table 2 – Measures of peer relationship quality (.pdf) - Table 3 – List of excluded studies with reasons (.xlsx)
B.Supplementary figures (SF)- Figure 1 –Conceptual triangulation (.pdf)- Figure 2 – Histogram of estimated correlations coefficients (.pdf)- Figures 3 – 95 – forest plots for all variables (.pdf)- Figures 96 – 219 – publication bias funnel plots (.bmp)- Figure 220 – Geographic data (.pdf)

C. Supplementary documents (SD)- Document 1 – Search strategy (.pdf)- Document 2 – Risk of bias (RoB) tools adaptation (.pdf)- Document 3 – List of included studies (.pdf)- Document 4 – PRISMA 2009 checklist (.pdf)- Document 5 – PRISMA 2009 flow diagram (.pdf)
D. Data set (DS)- DS1 - Meta-analysis data set (.xlsx)
title: Regime shift in an exploited fish community primarily driven by climate, only paltry by fishing
Creators: name: Auber, Arnaud
name: Travers-Trolet, Morgane
name: Ernande, Bruno
Publisher: name: ASC 2013 - Theme session B
Year: 2024
Subjects: The sea and human culture and societies
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. Identifying natural and anthropogenic drivers of marine ecosystem regime shifts is highly relevant to biodiversity conservation and sustainable exploitation. Here, we report a rapid, intense and persistent structural change in the exploited fish community of the Eastern English Channel, characterized by a shift from strong to moderate dominance of small-bodied forage species with low temperature preferendum in the mid-1990s. This regime shift was triggered by a concomitant switch of the Atlantic Multidecadal Oscillation from a cold to a warm phase. Surprisingly, fishing pressure played no role in this regime shift but still appeared as a forcing factor of the community structure.
The Growth of Intracluster Light in XCS-HSC Galaxy Clusters from $0.1 < z < 0.5$
Creators: name: Furnell, Kate E.
name: Collins, Chris A.
name: Kelvin, Lee S.
name: Baldry, Ivan K.
name: James, Phil A.
name: Manolopoulou, Maria
name: Mann, Robert G.
name: Giles, Paul A.
name: Bermeo, Alberto
name: Hilton, Matthew
name: Wilkinson, Reese
name: Romer, A. Kathy
name: Vergara, Carlos
name: Bhargava, Sunayana
name: Stott, John P.
name: Mayers, Julian
name: Viana, Pedro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We estimate the Intracluster Light (ICL) component within a sample of 18 clusters detected in XMM Cluster Survey (XCS) data using deep ($\sim$ 26.8 mag) Hyper Suprime Cam Subaru Strategic Program DR1 (HSC-SSP DR1) $i$-band data. We apply a rest-frame $μ_{B} = 25 \ \mathrm{mag/arcsec^{2}}$ isophotal threshold to our clusters, below which we define light as the ICL within an aperture of $R_{X,500}$ (X-ray estimate of $R_{500}$) centered on the Brightest Cluster Galaxy (BCG). After applying careful masking and corrections for flux losses from background subtraction, we recover $\sim$20% of the ICL flux, approximately four times our estimate of the typical background at the same isophotal level ($\sim$ 5%). We find that the ICL makes up about $\sim$ 24% of the total cluster stellar mass on average ($\sim$ 41% including the flux contained in the BCG within 50 kpc); this value is well-matched with other observational studies and semi-analytic/numerical simulations, but is significantly smaller than results from recent hydrodynamical simulations (even when measured in an observationally consistent way). We find no evidence for any links between the amount of ICL flux with cluster mass, but find a growth rate of $2-4$ for the ICL between $0.1 < z < 0.5$. We conclude that the ICL is the dominant evolutionary component of stellar mass in clusters from $z \sim 1$. Our work highlights the need for a consistent approach when measuring ICL alongside the need for deeper imaging, in order to unambiguously measure the ICL across as broad a redshift range as possible (e.g. 10-year stacked imaging from the Vera C. Rubin Observatory).
description: Accepted by MNRAS (05/01/2021), 20 pages, 17 figures
Outreach in community archives in British Columbia: four case studies
Creators: name: O’Donnell, Christine Ann
Publisher: name: University of British Columbia
Year: 2009

description: In the past, little has been written about the practical aspects of outreach. This thesis investigates the value of outreach and how it is put into practice in British Columbia's community archives. Interviews with managers of four community archives were conducted. The findings reveal that three of the interviewees regard outreach as a high priority and a fundamental part of regular activity. For these respondents, outreach activities have been positive and beneficial. They have successfully used outreach to augment and assist with acquisition, preservation and use of archival records. Only one interviewee presented a passive and cautious approach towards outreach. Results of this study indicate that outreach activities are not influenced by the administrative setting or the budget of the archives. This study identified the essential components necessary for the implementation and delivery of successful outreach initiatives as: a regular source of funding, incorporation into an annual work plan, district goals and objectives that are relevant to the mandate of the institution, attention to the target audience, community co-operation and support, and evaluation of results. This study reaffirms the value of archivists practising outreach, and provides encouragement to those who are looking for concrete methods of approaching outreach.