cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Elastic cloaking theory
Creators: name: Norris, A. N.
name: Shuvalov, A. L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The transformation theory of optics and acoustics is developed for the equations of linear anisotropic elasticity. The transformed equations correspond to non-unique material properties that can be varied for a given transformation by selection of the matrix relating displacements in the two descriptions. This gauge matrix can be chosen to make the transformed density isotropic for any transformation although the stress in the transformed material is not generally symmetric. Symmetric stress is obtained only if the gauge matrix is identical to the transformation matrix, in agreement with Milton et al. (2006). The elastic transformation theory is applied to the case of cylindrical anisotropy. The equations of motion for the transformed material with isotropic density are expressed in Stroh format, suitable for modeling cylindrical elastic cloaking. It is shown that there is a preferred approximate material with symmetric stress that could be a useful candidate for making cylindrical elastic cloaking devices.
description: 24 pages
The Sturm-Liouville problem and the Polar Representation Theorem
Creators: name: Rezende, Jorge
Publisher: name: arXiv
Year: 2010
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 34B24, 34C10, 34A30

description: The polar representation theorem for the n-dimensional time-dependent linear Hamiltonian system with continuous coefficients, states that, given two isotropic solutions (Q1, P1) and (Q2, P2), with the identity matrix as Wronskian,the formula Q2 = rcos(f), Q1 = rsin(f), holds, where r and f are continuous matrices, r is non-singular and f is symmetric. In this article we use the monotonicity properties of the matrix f eigenvalues in order to obtain results on the Sturm-Liouville problem.
Web 3.0 in Education
Creators: name: Ana-Maria, Chisega-Negrila
Publisher: name: Editura Universitara
Year: 2012
Subjects: subject: 0 Social sciences
subject: 37 Education
subject: 371 Instructional design
subject: 004:37 Elearning

description: In this paper, the concept of Web 3.0 will be examined to find its possible educational uses and benefits. Moreover, the author will look into the impact of Web 3.0 on course design, on the one hand, and on the learners ability to identify and attend several courses provided by institutions, on the other hand.
Closed form solution for a double quantum well using Gröbner basis
Creators: name: Acus, A.
name: Dargys, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Analytical expressions for spectrum, eigenfunctions and dipole matrix elements of a square double quantum well (DQW) are presented for a general case when the potential in different regions of the DQW has different heights and effective masses are different. This was achieved by Gröbner basis algorithm which allows to disentangle the resulting coupled polynomials without explicitly solving the transcendental eigenvalue equation.
description: 4 figures, Mathematica full calculation notebook
E-Learning Tools for Computer Aided Design of Knitted Fabrics
Creators: name: Ana-Ramona, Ciobanu; Mirela, Blaga
Publisher: name: Editura Universitara
Year: 2012
Subjects: subject: 0 Social sciences
subject: 37 Education
subject: 371 Instructional design
subject: 004:37 Elearning

description: The paper presents an interactive technical lesson, developed by using the Course Lab educational platform. The subject is dealing with the Computer Aided Design (CAD) stages for developing 3D weft knitted fabrics, produced on the computer controlled double needle bed flat knitting machines, CMS 530 E6.2, Stoll Germany. The lesson is presented to the student as printed information, accompanied by images, drawings and video tutorial, which can be instantly accessed by the students through the hyperlink structure of the lesson s content. Thus, it has been created a program with an interactive content that can be accessed in every step of any user�s work and can be used on any computer in offline or online mode.
DIGIKIDS: Technology Mediated Development, Beyond Fear and Stereotypes
Creators: name: Laura-Elena, Ciolan
Publisher: name: Editura Universitara
Year: 2012
Subjects: subject: 0 Social sciences
subject: 37 Education
subject: 371 Instructional design
subject: 004:37 Elearning

description: The social and pedagogical discourse about digital natives, Millennials, or digikids is not so new anymore, but as the case with many serious, even dramatic changes, a whole range of  stereotypes and prejudices developed concerning this new generation, seriously affecting the quality of interaction with adults in general, and the quality of educational interaction in particular. We will try in this paper to look the learning characteristics of the new generation of kids, as well as on their consequences in designing learning experiences.
HerMES: Deep Galaxy Number Counts from a P(D) Fluctuation Analysis of SPIRE Science Demonstration Phase Observations
Creators: name: Glenn, J.
name: Conley, A.
name: Bethermin, M.
name: Altieri, B.
name: Amblard, A.
name: Arumugam, V.
name: Aussel, H.
name: Babbedge, T.
name: Blain, A.
name: Bock, J.
name: Boselli, A.
name: Buat, V.
name: Castro-Rodriguez, N.
name: Cava, A.
name: Chanial, P.
name: Clements, D. L.
name: Conversi, L.
name: Cooray, A.
name: Dowell, C. D.
name: Dwek, E.
name: Eales, S.
name: Elbaz, D.
name: Ellsworth-Bowers, T. P.
name: Fox, M.
name: Franceschini, A.
name: Gear, W.
name: Griffin, M.
name: Halpern, M.
name: Hatziminaoglou, E.
name: Ibar, E.
name: Isaak, K.
name: Ivison, R. J.
name: Lagache, G.
name: Laurent, G.
name: Levenson, L.
name: Lu, N.
name: Madden, S.
name: Maffei, B.
name: Mainetti, G.
name: Marchetti, L.
name: Marsden, G.
name: Nguyen, H. T.
name: O'Halloran, B.
name: Oliver, S. J.
name: Omont, A.
name: Page, M. J.
name: Panuzzo, P.
name: Papageorgiou, A.
name: Pearson, C. P.
name: Perez-Fournon, I.
name: Pohlen, M.
name: Rigopoulou, D.
name: Rizzo, D.
name: Roseboom, I. G.
name: Rowan-Robinson, M.
name: Portal, M. Sanchez
name: Schulz, B.
name: Scott, Douglas
name: Seymour, N.
name: Shupe, D. L.
name: Smith, A. J.
name: Stevens, J. A.
name: Symeonidis, M.
name: Trichas, M.
name: Tugwell, K. E.
name: Vaccari, M.
name: Valtchanov, I.
name: Vieira, J. D.
name: Vigroux, L.
name: Wang, L.
name: Ward, R.
name: Wright, G.
name: Xu, C. K.
name: Zemcov, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Dusty, star forming galaxies contribute to a bright, currently unresolved cosmic far-infrared background. Deep Herschel-SPIRE images designed to detect and characterize the galaxies that comprise this background are highly confused, such that the bulk lies below the classical confusion limit. We analyze three fields from the HerMES programme in all three SPIRE bands (250, 350, and 500 microns); parameterized galaxy number count models are derived to a depth of ~2 mJy/beam, approximately 4 times the depth of previous analyses at these wavelengths, using a P(D) (probability of deflection) approach for comparison to theoretical number count models. Our fits account for 64, 60, and 43 per cent of the far-infrared background in the three bands. The number counts are consistent with those based on individually detected SPIRE sources, but generally inconsistent with most galaxy number counts models, which generically overpredict the number of bright galaxies and are not as steep as the P(D)-derived number counts. Clear evidence is found for a break in the slope of the differential number counts at low flux densities. Systematic effects in the P(D) analysis are explored. We find that the effects of clustering have a small impact on the data, and the largest identified systematic error arises from uncertainties in the SPIRE beam.
description: Accepted for publication in MNRAS
Dynamic and static voltage stability analysis of distribution systems in the presence of distributed generation
Creators: name: Nikpour, Nafiseh
Publisher: name: University of British Columbia
Year: 2016

description: In this research, static and dynamic voltage stability of distribution systems are studied, with a focus on systems with distributed generation. A voltage dependent model is used for distribution loads, which converts the static voltage stability analysis into a linear problem and allows for real-time solutions. For static voltage stability studies, an index is defined that contains critical data on load and system characteristics. The static voltage behavior of distribution systems, either with or without DG, is studied by analyzing the P-V curves and the proposed voltage stability index at each node of the system. Besides identifying the weakest buses of the system in terms of voltage profile and voltage stability, this approach also allows the extension of the classical voltage stability solution to the increasingly important case of distributed generation placement - where the system is more likely to face voltage transients. The method can also be used in resilience studies. For dynamic voltage stability studies, the Shifted Frequency Analysis (SFA) method is used to evaluate the system transients and its dynamic voltage behavior during and right after being subjected to a change or disturbance in the system. Various scenarios are discussed, including scenarios in which the voltage transients due to DG cause voltage instabilities in the system. SFA and EMTP solutions are compared with each other, and with the static analysis results. SFA and EMTP results also verify the validity of the proposed voltage stability index. The proposed voltage assessment method facilitates real-time decision making, topological reconfiguration to strengthen voltage stability robustness, and DG placement. Different scenarios and distribution system topologies such as looped or meshed distribution systems, as well as microgrids and autonomous/islanded energy grids can be included in the solution.
Equal Chances through Unequal Opportunities: Facilitating Language Learning among Students in Medicine, Nursing and Nutrition through E-Learning
Creators: name: Ioana, Cretu; Anca, Colibaba
Publisher: name: Editura Universitara
Year: 2012
Subjects: subject: 0 Social sciences
subject: 37 Education
subject: 371 Instructional design
subject: 004:37 Elearning

description: The paper explores the potential benefits of using Blended Learning (face-to-face and online) to teach languages to students at university level by analyzing the experience gained at Gr. T. Popa University of Medicine and Pharmacy Iasi in partnership with EuroEd Foundation Iasi.
E-Learning and E-Teaching, A Model of E-Course Design through a Systematic Approach and Outcomes - Based Planning
Creators: name: Iuliana, Dobre
Publisher: name: Editura Universitara
Year: 2012
Subjects: subject: 0 Social sciences
subject: 37 Education
subject: 371 Instructional design
subject: 004:37 Elearning

description: In this article the author is addressing briefly some key aspects of the teacher s new roles within E-learning environment approached by various researchers in their published paper work. Also, the author is presenting a brief overview of the instructional design models and most important aspects of the outcomes-based planning as well as is proposing a model of an Ecourse designed through a systematic approach and outcomes-based planning, applicable to higher education E-learning courses.
title: Ανοιχτά συστήματα, στην Ακαδημία του Πλάτωνα
title: Open systems, On Plato Academy
Creators: name: Κουτσουκος Γεωργιος
Publisher: name: Technical University of Crete
Year: 2025

description: Τα ανοιχτά αρχιτεκτονικά συστήματα, ως εργαλείο επίλυσης αστικών ζητημάτων στην περιοχή της Ακαδημίας Πλάτωνος.
Στην παρούσα διπλωματική εργασία διερευνώνται οι δυνατότητες που έχουν τα «ανοιχτά συστήματα» στην αρχιτεκτονική πρακτική, σκοπός είναι να δημιουργηθεί ένας καινούργιος τρόπο αστικής ζωής στην λαϊκή περιοχή της Ακαδημίας του Πλάτωνα, η οποία αποτελεί μέρος του Δήμου των Αθηνών.
Η ανάγκη που υπάρχει για ρήξη με τον ατομικισμό, με τις προσωπικές ουτοπίες του προαστίου και του κλειστού συστήματος του συμβατικού διαμερίσματός καθώς και η προσπάθεια αντιπαράθεσης με την νεοφιλελεύθερη προσταγή για Ασφάλεια, Άνεση και Βιωσιμότητα στην σύγχρονη αρχιτεκτονική πρακτική, αντικατοπτρίζεται σχεδιαστικά με την δημιουργία αφαιρετικών “μηχανών” χώρου τα οποία συναρμολογούν δομές πολιτισμού, για να παραλάβουν τις ανάγκες του αρχαιολογικού χώρου καθώς και το πρόγραμμά του αστικού πάρκου. Μονάδες συλλογικής κατοίκισης συμπληρώνουν τα οικοδομικά τετράγωνα προκείμενου να δημιουργήσουν τις κατάλληλες αστικές συνθήκες για την λειτουργία όλου του συστήματος και του πάρκου αλλά και για την επίλυση του στεγαστικού ζητήματος. Τέλος, ένα δημοτικό κέντρο πολιτισμού και εφαρμοσμένων τεχνών παραλαμβάνει κατάστασης της πόλης σε μια μοναδιαία σύγχρονη δομή και ολοκληρώνει το σύνολο των επεμβάσεων.
Weak ferromagnetism in cobalt oxalate crystals
Creators: name: Romero, E.
name: Mendoza, M. E.
name: Escudero, R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Microcrystals of diaquocobalt(II) oxalate have been synthesized by the coprecipitation reaction of aqueous solutions of Cobalt (II) bromide and oxalic acid. Chemical analysis and thermal experiments revealed that there is only one phase present. X-ray powder diffraction studies show that this compound is orthorhombic with space group Cccm. Molar susceptibility versus temperature measurements show the existence of an antiferromagnetic ordering, however, the hysteresis measured in magnetization measurements as a function of magnetic field reveals a weak ferromagnetic behavior.
description: 7 pages, 11 figures
Werkzeuge und Strategien zur Beschleunigung der Transformation des wissenschaftlichen Publikationssystems hin zu Open Access
Creators: name: Tillmann, Diana
name: Grossmann, Alexander
name: Reiche, Michael
name: Böhm, David
Publisher: name: Zenodo
Year: 2021
Subjects: Leipzig University of Applied Sciences
standardisierter Datenaustausch
Open-Source-Tool
Beratungsstrategien
Research Project

description: Das Forschungsprojekt „OPEN-ACCESS-Strukturierte-Kommunikation (OA-STRUKTKOMM)" wird von 15. Februar 2021 bis 31. Januar 2023 durch das Bundesministerium für Bildung und Forschung (BMBF) an der HTWK Leipzig gefördert. Es sieht sich in der Nachfolge des im März 2020 erfolgreich abgeschlossenen Projektes „OPEN-ACCESS-Hochschulverlag (OA-HVerlag)“. Das Forschungsprojekt hat sich u. a. zum Ziel gesetzt, die für die flächendeckende Einführung eines bereits entwickelten nachhaltigen, allgemeingültigen State-of-the-Art-Workflows zur Herstellung und Verbreitung von OA-Monografien die notwendigen Werkzeuge und Strategien zu entwickeln. Dabei soll durch die Entwicklung einer standardisierten Kommunikationsstruktur der Datenaustausch zwischen den workflowbeteiligten Systemen bei OA-Publikationen robuster und kompatibel gestaltet werden. Damit soll eine nachhaltige gesellschaftliche Teilhabe an einen offenen und ungehinderten Zugang zu Wissen sowie aktuellen Forschungsergebnissen gefördert werden.
 Die Forschungsarbeit fokussiert sich auf folgende Schwerpunkte:
 Es wird eine standardisierte Kommunikationsstruktur entwickelt, in der alle Informationen zu Veröffentlichungsprojekten gehalten und ausgetauscht werden können. Die als offen anzulegende Struktur soll dabei alle bereits vorhandenen Standards adressieren und implementieren. Die Struktur dient dazu, Hochschulbibliotheken und Dienstanbietern eine standardisierte Schnittstelle zum Datenaustausch anzubieten, die den Implementierungsaufwand erheblich senken soll.
 Es wird ein automatisiertes XML-first-Satzsystem entwickelt, welches Hochschulverlagen und –bibliotheken die Möglichkeit bietet, auch ohne spezifisches herstellerisches Wissen OA-Monografien und Hochschulschriften mit limitierten Freiheitsgraden hinsichtlich Durchsatz und Gestaltung herzustellen. Das Satzsystem wird als plattformunabhängiges Tool entwickelt, das ohne Installationsaufwand als Out-of-the-Box-Lösung zur Verfügung gestellt wird.
 Zur Etablierung des State-of-the-Art-Workflows sowie zur Unterstützung von Modellierungsprozessen werden Beratungsstrategien sowie dazugehörige Unterlagen entwickelt, getestet und sofort praktisch verifiziert und verbessert. Dies soll Hochschulverlagen in Gründung bei der Entscheidung über individuell geeignete Workflowstrategien unterstützen und es diesen ermöglichen, mit potenziellen Partnern bi- oder multilaterale Produktionsworkflows zu planen und ins Werk zu setzen.
Free group automorphisms with parabolic boundary orbits
Creators: name: Hilion, Arnaud
Publisher: name: arXiv
Year: 2011
Subjects: subject: Group Theory (math.GR)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: For $N\geq 4$, we show that there exist automorphisms of the free group $F_N$ which have a parabolic orbit in $\partial F_N$. In fact, we exhibit a technology for producing infinitely many such examples.
Optimal design of redundant structural systems: fundamentals
Creators: name: Beck, Andre T.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: In spite of extended recent interest in System Reliability-Based Design Optimization (System RBDO) and life-cycle cost or Risk Optimization (RO), there is a lack of published studies on optimal design of redundant hyperstatic systems with objective consideration of (a) progressive collapse and (b) the impact of epistemic uncertainties. This paper investigates the fundamental aspects of the problem, by addressing the optimal design of simple two-bar active and passive redundant systems. Progressive collapse is objectively addressed, differentiating consequences of direct collapse of statically determinate structures, and progressive collapse of redundant, statically indeterminate structures. It is well known that reliability of a structural system also depends on nonstructural factors, or factors beyond structural design, such as unanticipated loading, manufacturing quality, quality of workmanship and human errors. These factors can be taken into account in an encompassing risk analysis, which accounts for physical and epistemic uncertainties, and which contributes a fixed latent failure probability to the structural optimization problem. Results presented herein show that the latent failure probability is the single most important parameter in determining optimal solutions, in System RBDO and in RO solutions. When the latent failure probability is smaller than target (System RBDO) or optimal (RO) failure probabilities, there is an equivalence between redundant and non-redundant (hyperstatic and isostatic) designs. However, when the latent reliability is smaller than target or optimal reliabilities, optimal designs become necessarily redundant (hyperstatic); as the only way to make system reliability larger than the latent reliability is by making structural systems redundant.
description: 47 pages, 14 figures
A Possible Tilted Orbit of the Super-Neptune HAT-P-11b
Creators: name: Hirano, Teruyuki
name: Narita, Norio
name: Shporer, Avi
name: Sato, Bun'ei
name: Aoki, Wako
name: Tamura, Motohide
Publisher: name: arXiv
Year: 2010
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We report the detection of the Rossiter-McLaughlin effect for the eccentric, super-Neptune exoplanet HAT-P-11b, based on radial velocity measurements taken with HDS mounted on the Subaru 8.2m telescope, and simultaneous photometry with the FTN 2.0m telescope, both located in Hawai'i. The observed radial velocities during a planetary transit of HAT-P-11b show a persistent blue-shift, suggesting a spin-orbit misalignment in the system. The best-fit value for the projected spin-orbit misalignment angle is $λ= 103_{-19}^{+23}$ deg. Our result supports the notion that eccentric exoplanetary systems are likely to have significant spin-orbit misalignment (e.g., HD 80606, WASP-8, WASP-14, WASP-17, and XO-3). This fact suggests that not only hot-Jupiters but also super-Neptunes like HAT-P-11b had once experienced dynamical processes such as planet-planet scattering or the Kozai migration.
description: 6 pages, 2 figures, submitted to PASJ
Women's magazines and the democratization of print and reading culture in interwar Japan
Creators: name: Maeshima, Shiho
Publisher: name: University of British Columbia
Year: 2016

description: This dissertation reconsiders the significance of a periodical genre hitherto marginalized in academia, namely, the Japanese mass-market women’s magazine, in the history of print/reading culture in modern Japan. The study also aims to investigate the interrelations among magazine genres, gender categories, and the formation of cultural hierarchy. Analysis of diverse periodicals from the late 19th century to the 1930s, their contemporary commentaries and various surveys reveals that, around the turn of the 20th century, magazine genres became increasingly gendered in terms of their formats, editing styles, content, and readership: magazines for adults evolved into either “serious” general magazines for men concerning “public” matters or “vulgar” women’s magazines on “light” issues related to the “domestic” sphere. It was the latter magazine genre that led to the democratization of print/reading culture in interwar Japan. Inclusion of various article genres written in highly colloquial styles, extensive use of visuals, stress on entertainment and people’s private lives, and increasing collaboration with other industries, were to become common practices among Japanese periodicals after WWII. The new editing style also contributed to the spread of a new reading style in Japan. With its accessible editorial and promotional styles, the interwar mass-market women’s magazine attracted readers from a wide range of ages and social classes, including men, and functioned as the “transfeminized” entertaining home magazine. Moreover, other periodicals, including the more “serious” types, also began adopting some of the strategies developed in the popular women’s magazine, a periodical genre that had formerly been regarded as “deviant.” Arguably, the subversive impact the mass-market women’s magazine had on the publishing world triggered severe criticism. Thanks to its highly developed readers’ involvement and “transparent” mode of expression, the interwar popular women’s magazine presented a seemingly democratic and egalitarian magazine community. Closer examination of its articles, however, reveals unequal relationships between its readers and editors as well as among the readers, which offers valuable insight regarding its relation with discursive formation of diverse modern discourses and global trends in publishing.
Supplementary materials.pdf
Creators: name: He, Jianjie
Publisher: name: figshare
Year: 2023
Subjects: Biological network analysis

description: Supplementary materials for the letter 'The newly generated alien addition lines between Brassica napus and Isatis indigotica are edible medicinal plants'.
Experimental activities in few-body physics
Creators: name: Messchendorp, J. G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Understanding the few-nucleon system remains one of the challenges in modern nuclear and hadron physics. Observables in few-nucleon scattering processes are sensitive probes to study the two and many-body interactions between nucleons in nuclei. In the past decades, several facilities provided a large data base to study in detail the three-nucleon interactions below the pion-production threshold by exploiting polarized proton and deuteron beams and large-acceptance detectors. Only since recently, the four-nucleon scattering process at intermediate energies has been explored. In addition, there is a focus to collect data in the hyperon-nucleon sector, thereby providing access to understand the more general baryon-baryon interaction. In this contribution, some recent results in the few-nucleon sector are discussed together with some of the preliminary results from a pioneering and exclusive study of the four-nucleon scattering process. Furthermore, this paper discusses the experimental activities in the hyperon sector, in particular, the perspectives of the hyperon program of PANDA.
description: 9 pages, 4 figures, proceedings of the 21st European Conference on Few Body Problems in Physics, Salamanca, Spain, 30 August - 3 September 2010
Performing family “like a dog unleashed” : looking at filiality through the lens of postmemory in Vietnamese diasporic fiction
Creators: name: Minh, Cynthia
Publisher: name: University of British Columbia
Year: 2016

description: This thesis examines how Vietnamese refugee families are perceived through visual frames and memories, and in particular how 1.5 or second generation Vietnamese refugee narratives are frequently characterized by the presence of intergenerational conflict. I consider the ways in which two texts, lê thi diem thúy’s the gangster we are looking for and Truong Tran’s dust and conscience, aesthetically reconstruct the ideological family space through the lens of Marianne Hirsch’s concept of postmemory. In the gangster we are all looking for, visual configurations of postmemory invite readers to look at intergenerational conflict through the affiliative histories of post-war trauma, displacement, state oppression, and filial debt. In dust and conscience, affiliative ways of looking redefine fraught filial interactions as performative acts rather than prescriptive ones. By presenting alternative ways of looking at families, these texts challenge normative filial structures, and instead advocate for ambivalent forms of belonging to a family or nation.
Controlling the phase of a light beam with a single molecule
Creators: name: Pototschnig, M.
name: Chassagneux, Y.
name: Hwang, J.
name: Zumofen, G.
name: Renn, A.
name: Sandoghdar, V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We employ heterodyne interferometry to investigate the effect of a single organic molecule on the phase of a propagating laser beam. We report on the first phase-contrast images of individual molecules and demonstrate a single-molecule electro-optical phase switch by applying a voltage to the microelectrodes embedded in the sample. Our results may find applications in single-molecule holography, fast optical coherent signal processing, and single-emitter quantum operations.
Elliptical Polarization and Probability of Double Ionization
Creators: name: Wang, Xu
name: Eberly, J. H.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The degree of elliptical polarization of intense short laser pulses is shown to be related to the timing of strong-field non-sequential double ionization. Higher ellipticity is predicted to force the initiation of double ionization into a narrower time window, and this "pins" the ionizing field strength in an unexpected way, leading to the first experimentally testable formula for double ionization probability as a function of ellipticity.
KOALA - Konsortiale Open-Access-Lösungen aufbauen
Creators: name: Tullney, Marco
name: Schulz, Katharina
name: Benz, Martina
name: Oberländer, Anja
Publisher: name: Zenodo
Year: 2021
Subjects: Open Access
Finanzierung
Diamond Open Access
Konsortien
Non-APC

description: Im Projekt KOALA (Konsortiale Open-Access-Lösungen aufbauen) werden konsortiale Lösungen zur Finanzierung von Open Access etabliert. Die gemeinschaftliche Finanzierung von Open-Access-Zeitschriften und -Buchreihen durch wissenschaftliche Bibliotheken stellt eine Alternative zum dominanten APC-Modell dar, bei dem Artikel einzeln von Autor*innen oder ihren Institutionen bezahlt werden. Das vom Bundesministerium für Bildung und Forschung (BMBF) geförderte Projekt startete im April 2021 und wird von der Technischen Informationsbibliothek (TIB) gemeinsam mit dem Kommunikations-, Informations-, Medienzentrum (KIM) der Universität Konstanz umgesetzt. Während der zweijährigen Laufzeit soll mindestens ein entsprechendes Konsortium als Finanzierungspartner für Open-Access-Periodika aufgebaut werden. In diesem Rahmen werden weitere Analysen durchgeführt und Umstellungen von Periodika auf Open Access begleitet. Zusätzlich wird ein zentraler Helpdesk für Herausgeber*innen geschaffen, die Unterstützung bei der Open-Access-Umstellung oder bei der Suche nach einer nachhaltigen Finanzierung benötigen. Die durch KOALA geschaffene Infrastruktur ermöglicht eine faire und nachhaltige Finanzierung qualitätsgesicherter Open-Access-Publikationen. Sie trägt dazu bei, finanzielle Hürden für Autor*innen abzubauen und damit die Teilhabe an Open-Access-Publikationen zu erleichtern. Das Poster stellt das Projekt vor und dient dazu, mit Interessierten ins Gespräch zu kommen, indem es auf die verschiedenen Perspektiven der Bezugsgruppen Bibliotheken, Herausgeber*innen und Verlage eingeht.
The Physical Conditions in Starbursts Derived from Bayesian Fitting of Mid-IR SEDS: 30 Doradus as a Template
Creators: name: Martínez-Galarza, J. R.
name: Groves, B.
name: Brandl, B.
name: de Messieres, G. E.
name: Indebetouw, R.
name: Dopita, M. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: To understand and interpret the observed Spectral Energy Distributions (SEDs) of starbursts, theoretical or semi-empirical SED models are necessary. Yet, while they are well-founded in theory, independent verification and calibration of these models, including the exploration of possible degeneracies between their parameters, are rarely made. As a consequence, a robust fitting method that leads to unique and reproducible results has been lacking. Here we introduce a novel approach based on Bayesian analysis to fit the Spitzer-IRS spectra of starbursts using the SED models proposed by Groves et al. (2008). We demonstrate its capabilities and verify the agreement between the derived best fit parameters and actual physical conditions by modelling the nearby, well-studied, giant HII region 30 Dor in the LMC. The derived physical parameters, such as cluster mass, cluster age, ISM pressure and covering fraction of photodissociation regions, are representative of the 30 Dor region. The inclusion of the emission lines in the modelling is crucial to break degeneracies. We investigate the limitations and uncertainties by modelling sub-regions, which are dominated by single components, within 30 Dor. A remarkable result for 30 Doradus in particular is a considerable contribution to its mid-infrared spectrum from hot ({\simeq} 300K) dust. The demonstrated success of our approach will allow us to derive the physical conditions in more distant, spatially unresolved starbursts.
description: 17 pages, 10 figures. Accepted por publication in the Astrophysical Journal
Resource-efficient Deep Neural Networks for Automotive Radar Interference Mitigation
Creators: name: Rock, Johanna
name: Roth, Wolfgang
name: Toth, Mate
name: Meissner, Paul
name: Pernkopf, Franz
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Radar sensors are crucial for environment perception of driver assistance systems as well as autonomous vehicles. With a rising number of radar sensors and the so far unregulated automotive radar frequency band, mutual interference is inevitable and must be dealt with. Algorithms and models operating on radar data are required to run the early processing steps on specialized radar sensor hardware. This specialized hardware typically has strict resource-constraints, i.e. a low memory capacity and low computational power. Convolutional Neural Network (CNN)-based approaches for denoising and interference mitigation yield promising results for radar processing in terms of performance. Regarding resource-constraints, however, CNNs typically exceed the hardware's capacities by far. In this paper we investigate quantization techniques for CNN-based denoising and interference mitigation of radar signals. We analyze the quantization of (i) weights and (ii) activations of different CNN-based model architectures. This quantization results in reduced memory requirements for model storage and during inference. We compare models with fixed and learned bit-widths and contrast two different methodologies for training quantized CNNs, i.e. the straight-through gradient estimator and training distributions over discrete weights. We illustrate the importance of structurally small real-valued base models for quantization and show that learned bit-widths yield the smallest models. We achieve a memory reduction of around 80\% compared to the real-valued baseline. Due to practical reasons, however, we recommend the use of 8 bits for weights and activations, which results in models that require only 0.2 megabytes of memory.
description: 15 pages; published in IEEE Journal of Selected Topics in Signal Processing, Special Issue on Recent Advances in Automotive Radar Signal Processing, Volume: 15, Issue: 4, June 2021. arXiv admin note: text overlap with arXiv:2011.12706
HI Clouds in the M81 Filament as Dark Matter Minihalos--A Phase-Space Mismatch
Creators: name: Chynoweth, Katie M.
name: Langston, Glen I.
name: Holley-Bockelmann, Kelly
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Cosmological galaxy formation models predict the existence of dark matter minihalos surrounding galaxies and in filaments connecting groups of galaxies. The more massive of these minihalos are predicted to host HI gas that should be detectable by current radio telescopes such as the GBT. We observed the region including the M81/M82 and NGC 2403 galaxy groups, searching for observational evidence of an HI component associated with dark matter halos within the "M81 Filament", using the Robert C. Byrd Green Bank Telescope (GBT). The map covers an 8.7 degree x 21.3 degree (480 kpc x 1.2 Mpc) region centered between the M81/M82 and NGC 2403 galaxy groups. Our observations cover a wide velocity range, from -890 to 1320 km/s, which spans much of the range predicted by cosmological N-body simulations for dark matter minihalo velocities. Our search is not complete in the velocity range -210 to 85 km/s, containing Galactic emission and the HVC Complex A. For an HI cloud at the distance of M81, with a size < 10 kpc, our average 5-sigma mass detection limit is 3.2 x 10^6 M_Sun, for a linewidth of 20 km/s. We compare our observations to two large cosmological N-body simulations and find that the simulation predicts a significantly greater number of detectable minihalos than are found in our observations, and that the simulated minihalos do not match the phase space of observed HI clouds. These results place strong constraints on the HI gas that can be associated with dark-matter halos. Our observations indicate that the majority of extragalactic HI clouds with a mass greater than 10^6 M_Sun are likely to be generated through tidal stripping caused by galaxy interactions.
description: 15 pages, 7 figures. Accepted for publication in the AJ with minor revisions
Diagnostically Resilient Encoding, Wireless Transmission, and Quality Assessment of Medical Video
Creators: name: Panayides, A.S.
Publisher: name: Zenodo
Year: 2011

description: A new framework for effective communication and evaluation of wireless medical video over error-prone channels is proposed. This is motivated by the need to efficiently address unique requirements associated with medical video source encoding, wireless transmission, and quality assessment. The envisioned utilization scenarios target remote diagnosis and care and emergency situations. A unified framework is developed that: (i) provides a diagnostically relevant medical video encoding based on clinical criteria, (ii) enables diagnostically resilient medical video encoding for reliable communications over noisy wireless channels, and (iii) introduces objective and subjective criteria for clinical video quality assessment. The approach is based on a spatially varying encoding scheme, where video slice quantization parameters are varied as a function of diagnostic significance. Video slices are automatically set based on a segmentation algorithm. They are then encoded using a modified version of H.264/AVC flexible macroblock ordering (FMO) technique that allows variable quality slice encoding and redundant slices (RS) for resilience over error prone communication channels.Evaluation of the proposed scheme is performed on a representative collection of ten (10) ultrasound videos, nine of the carotid and one of the femoral arteries, for packet loss rates up to 30%. Extensive simulations incorporating three FMO encoding Andreas Stavrou Panayides – University of Cyprus 2011 methods, different quantization levels and display resolutions, and different packet loss scenarios are investigated. Quality assessment is based on a new clinical rating system that provides for independent evaluations of the different parts of the video (subjective). Objective video quality assessment metrics are also employed and their correlation to the clinical quality assessment of plaque type is derived. To this end, some objective quality assessment measures computed over the plaque video slices gave very good correlations to mean opinion scores (MOS). Here, MOS were computed using two medical experts. Experimental results show that the proposed method achieves enhanced performance in noisy environments, while achieving significant bandwidth demands reductions, providing for transmission over 3G (and beyond) wireless networks. The proposed unified framework can be modified for application to other medical video modalities. This requires the identification of diagnostic ROIs, the adoption of a new clinical diagnostic rating system, and expert validation.
description: Doctoral Theses
Climate modelling: computing and data challenges
Creators: name: Joussaume, Sylvie
Publisher: name: Zenodo
Year: 2021

description: Climate models are extensively used to assess mitigation and adaptation strategies for climate change, as shown by the Intergovernmental Panel on Climate Change Assessment Reports. The international climate modelling community supports these assessments through internationally coordinated experiments, the latest one in support to the 6th Assessment Report (to come out August 2021) being the 6th phase of the Coupled modeling intercomparison project, CMIP6. These experiments provide climate projections for future climate scenarios but also enhance the scientific basis for model evaluation and for understanding of climate processes. They represent an important investment in both computing and data shared openly through the Earth System Grid Federation, supported by the European Network for Earth System modelling (ENES) infrastructure project, IS-ENES. The future of climate modeling highly depends on available computing power: ensemble of prediction experiments to better estimate uncertainties, increase of resolution to better represent small scale processes, enhanced complexity of the Earth’s climate system to include biogeochemical cycles, capacity to run long experiments to investigate climate stability. Preparing for next generation climate models, enabling efficient high-resolution simulations, is addressed by the European Center of Excellence in HPC, ESiWACE. It gathers the climate and weather modelling communities with the object to enhance synergies between the two communities to address the new computing architectures, a challenge for these communities relying on legacy codes. Presented at the eScience 2021 Conference on September 21st, 2021.
Additional file 1 of Enhancement in Seed Priming-Induced Starch Degradation of Rice Seed Under Chilling Stress via GA-Mediated α-Amylase Expression
Creators: name: Nie, Lixiao
name: Song, Shaokun
name: Yin, Qi
name: Zhao, Tingcheng
name: Liu, Hongyan
name: He, Aibin
name: Wang, Weiqin
Publisher: name: figshare
Year: 2022
Subjects: subject: Plant Biology
subject: FOS: Biological sciences

description: Additional file 1. Table S1. Sequences of primers used for RT-qPCR.
The Cosmic Origins Spectrograph: On-Orbit Instrument Performance
Creators: name: Osterman, S.
name: Green, J.
name: Froning, C.
name: Béland, S.
name: Burgh, E.
name: France, K.
name: Penton, S.
name: Delker, T.
name: Ebbets, D.
name: Sahnow, D.
name: Bacinski, J.
name: Kimble, R.
name: Andrews, J.
name: Wilkinson, E.
name: McPhate, J.
name: Siegmund, O.
name: Ake, T.
name: Aloisi, A.
name: Biagetti, C.
name: Diaz, R.
name: Dixon, W.
name: Friedman, S.
name: Ghavamian, P.
name: Goudfrooij, P.
name: Hartig, G.
name: Keyes, C.
name: Lennon, D.
name: Massa, D.
name: Niemi, S.
name: Oliveira, C.
name: Osten, R.
name: Proffitt, C.
name: Smith, T.
name: Soderblom, D.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Cosmic Origins Spectrograph (COS) was installed in the Hubble Space Telescope in May, 2009 as part of Servicing Mission 4 to provide high sensitivity, medium and low resolution spectroscopy at far- and near-ultraviolet wavelengths (FUV, NUV). COS is the most sensitive FUV/NUV spectrograph flown to date, spanning the wavelength range from 900Å to 3200Å with peak effective area approaching 3000 cm^2. This paper describes instrument design, the results of the Servicing Mission Orbital Verification (SMOV), and the ongoing performance monitoring program.
description: 9 pages, 7 figures, submitted to Astrophysics and Space Science
The Quantum Speed Limit of Optimal Controlled Phasegates for Trapped Neutral Atoms
Creators: name: Goerz, Michael H.
name: Calarco, Tommaso
name: Koch, Christiane P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study controlled phasegates for ultracold atoms in an optical potential. A shaped laser pulse drives transitions between the ground and electronically excited states where the atoms are subject to a long-range 1/R^3 interaction. We fully account for this interaction and use optimal control theory to calculate the pulse shapes. This allows us to determine the minimum pulse duration, respectively, gate time T that is required to obtain high fidelity. We accurately analyze the speed limiting factors, and we find the gate time to be limited either by the interaction strength in the excited state or by the ground state vibrational motion in the trap. The latter needs to be resolved by the pulses in order to fully restore the motional state of the atoms at the end of the gate.
description: 11 pages, 10 figures, 1 table
Biodiversity of bacteria and protists along a salinity gradient in the Fraser River estuary
Creators: name: Nawar, Ferdous
Publisher: name: University of British Columbia
Year: 2016

description: A fundamental goal of microbial ecology is to understand how microbial diversity is distributed over space and time. At broad scales, abiotic factors drive microbial community composition, and salinity plays a particularly important role. Do all microbes respond in the same way? Here I investigate the diversity of two domains encompassed within the blanket term ‘microbes’ the bacteria and protists (unicellular eukaryotes). I examined their diversity and composition across a river to ocean transect and compare the shifts in diversity that occur in these two domains. I collected 122 samples from the Fraser River, its plume and the adjacent coastal water at three time points covering the spring freshet. I used a combined approach of high-throughput sequencing and inverted microscopy to investigate the changes in diversity and community composition. As expected, there was a strong turnover in the community composition of bacteria and protists across the salinity gradient. I found that diversity of both the bacteria and protists was highest in the freshwater and brackish water with low salinity, and decrease with increasing salinity, and observed a high degree of separation between marine and freshwater community composition. However, the shift from communities with predominately fresh to marine water taxa occurs at the higher taxonomic level for bacteria (phylum/class) and lower taxonomic level (family/genus) for protists. Moreover, the inflection point for taxonomic distribution tends to occur around at 20 salinity for bacteria and 10 salinity for protists. Overall, bacteria are distributed more broadly across the salinity gradient than protists and more likely to be present across time points. In contrast, protists tend to be found in a narrower salinity range and are more often restricted to either marine or freshwater, and found at a single time point.
SuperDARN Observations of High Latitude Electrodynamics in the Terrestrial Ionosphere
Creators: name: Fogg, Alexandra Ruth
Publisher: name: University of Leicester
Year: 2021
Subjects: Uncategorized

description: Coupling of the solar wind and interplanetary magnetic field to the terrestrialsystem results in a dynamic magnetosphere-ionosphere interaction, full of complexityyet to be unravelled. In this thesis, high latitude electrodynamics willbe examined in relation to solar wind - magnetosphere - ionosphere coupling,primarily by observations from the Super Dual Auroral Radar Network (Super-DARN). SuperDARN is made up of, at time of writing, over 35 high frequencycoherent scatter radars, which provide near global coverage of the geomagneticpoles. Originally conceived to measure ionospheric convection, the SuperDARNdataset can be assimilated into minute resolution electrostatic potential solutions,known as ionospheric convection maps, which are the primary diagnostic tool inthis thesis. The quality of the derived equipotential maps is dependent on a varietyof processing stages, including the determination of the low latitude limitof the convection pattern. Firstly, a new method for determining the position ofthis boundary is presented, based on an examination of the relationship betweenthe scale sizes of the convection and field aligned current (FAC) regions. A linearrelationship is demonstrated, which can be used, incorporating independent FACmeasurements, to estimate a scatter independent measure of the low latitudelimit of the convection region. Finally, the effects of the impact of solar windpressure pulses on the terrestrial ionosphere will be examined. If the pressurepulse compresses the magnetosphere but does not trigger a geomagnetic storm,this is known as a positive sudden impulse. Enhancements in dayside driving ofthe ionosphere following the onset of a positive sudden impulse will be presentedboth in the form of a detailed case study, and statistically using a superposedepoch analysis. For the first time, simultaneous measurements of ionosphericconvection and FACs will be utilised to observe the effects of this phenomenon.