cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Distributed Multicell Beamforming Design Approaching Pareto Boundary with Max-Min Fairness
Creators: name: Huang, Yongming
name: Zheng, Gan
name: Bengtsson, Mats
name: Wong, Kai-Kit
name: Yang, Luxi
name: Ottersten, Bjorn
Publisher: name: arXiv
Year: 2012
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This paper addresses coordinated downlink beamforming optimization in multicell time-division duplex (TDD) systems where a small number of parameters are exchanged between cells but with no data sharing. With the goal to reach the point on the Pareto boundary with max-min rate fairness, we first develop a two-step centralized optimization algorithm to design the joint beamforming vectors. This algorithm can achieve a further sum-rate improvement over the max-min optimal performance, and is shown to guarantee max-min Pareto optimality for scenarios with two base stations (BSs) each serving a single user. To realize a distributed solution with limited intercell communication, we then propose an iterative algorithm by exploiting an approximate uplink-downlink duality, in which only a small number of positive scalars are shared between cells in each iteration. Simulation results show that the proposed distributed solution achieves a fairness rate performance close to the centralized algorithm while it has a better sum-rate performance, and demonstrates a better tradeoff between sum-rate and fairness than the Nash Bargaining solution especially at high signal-to-noise ratio.
description: 8 figures. To Appear in IEEE Trans. Wireless Communications, 2012
LMEEC: Layered Multi-Hop Energy Efficient Cluster-based Routing Protocol for Wireless Sensor Networks
Creators: name: Khelifi, Manel
name: Djabelkhir, Assia
Publisher: name: arXiv
Year: 2012
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: In this paper, we propose LMEEC, a cluster-based routing protocol with low energy consumption for wireless sensor networks. Our protocol is based on a strategy which aims to provide a more reasonable exploitation of the selected nodes (cluster-heads) energy. Simulation results show the effectiveness of LMEEC in decreasing the energy consumption, and in prolonging the network lifetime, compared to LEACH.
description: The 31st Annual IEEE International Conference on Computer Communications: INFOCOM'2012 Student Posters, Orlando, USA
Workflows für das Forschungsdatenmanagement (FDM) in den Digital Humanities an der LMU München
Creators: name: Servicestelle FDM-DH
name: Spenger, Martin
name: Bayer, Christiane
name: Kümmet, Sonja
name: Schulz, Julian
Publisher: name: Zenodo
Year: 2021
Subjects: Digital Humanities
Digitale Geisteswissenschaften
RDM
FDM
Research Data Management
Forschungsdatenmanagement
Metadata
Metadaten

description: Die Wokflows entstanden im Rahmen des Projekts “eHumanities- interdisziplinär” (https://www.fdm-bayern.org/ehumanities-interdisziplinaer/) und werden an der Ludwig-Maximilians-Universität München (LMU) von der Servicestelle FDM-DH (https://fdm.ub.uni-muenchen.de/fdm-dh) eingesetzt. Beteiligt an der Umsetzung der Workflows sind die IT-Gruppe Geisteswissenschaften sowie die Universitätsbibliothek der LMU. Ziel der Workflows ist es, die Beratung im Bereich Forschungsdatenmanagement für die (digitalen) Geisteswissenschaften an der LMU zu vereinheitlichen zu regulieren. Folgende Bereiche werden dabei abgedeckt: Bereich 1 – Kontaktaufnahme mit Datenproduzenten Bereich 2a – Antragstellung des DH-Vorhabens Bereich 2b – Umsetzung des DH-Vorhaben, FDM-spezifischer Anteil des DH-Vorhabens Bereich 3 – Veröffentlichung der Forschungsdaten Teilbereich – Metadatenanreicherung Für jeden Abschnitt des Workflows stehen jeweils eine grafische Darstellung sowie eine ausführliche Prozessbeschreibung zur Verfügung. Die Prozessbeschreibung deckt den Anwendungsfall für die geisteswissenschaftlichen Fakultäten an der LMU ab, kann aber auch angepasst bzw. erweitert werden und an anderen Einrichtungen bzw. weitere Disziplinen eingesetzt werden. Weiterführende Informationen zu den Angeboten der ITG und der UB der LMU: https://www.itg.uni-muenchen.de/forschungsdaten/index.html https://www.ub.uni-muenchen.de/schreiben/forschungsdaten/index.html
2-Riemannian manifolds
Creators: name: Morales, C. A.
name: Vilches, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C05 (Primary) 46C50 (Secondary)

description: A {\em 2-Riemannian manifold} is a differentiable manifold exhibiting a 2-inner product on each tangent space. We first study lower dimensional 2-Riemannian manifolds by giving necessary and sufficient conditions for flatness. Afterward we associate to each 2-Riemannian manifold a unique torsion free compatible pseudoconnection. Using it we define a curvature for 2-Riemannian manifolds and study its properties. We also prove that 2-Riemannian pseudoconnections do not have Koszul derivatives. Moreover, we define stationary vector field with respect to a 2-Riemannian metric and prove that the stationary vector fields in $\mathbb{R}^2$ with respect to the 2-Riemannian metric induced by the Euclidean product are the divergence free ones.
description: 28 pages
School Leadership Research in Botswana: Developing an Indigenous Approach
Creators: name: Pheko, Bolelang
name: Mitchell, Rafael
Publisher: name: Zenodo
Year: 2023
Subjects: African education
Botswana
decolonising education
decolonising research
distributed leadership
indigenous research methods
school leadership
Ubuntu

description: This background paper develops a case for adopting an indigenous approach to researching school leadership in Botswana. As an upper middle-income country Botswana has a stronger economy than many of its neighbours in the region, yet with respect to schooling it faces similar challenges which result from the ongoing legacies of colonialism (Ndlovu-Gatsheni 2013; Tikly 2020). Research has demonstrated profound tensions and contradictions within the school system, including fundamental disagreements about the purposes of education from traditional and Eurocentric perspectives (Tabulawa, 2003; Pheko & Linchwe II, 2007), and centralised policy decisions which overlook local realities in terms of language, curriculum, pedagogy and the school calendar (Tabulawa 2004, 2013; Pheko & Linchwe II 2007; Pheko 2008; Pansiri 2011; Mokibelo 2016). As we argue in this paper, the Covid-19 pandemic provides fertile ground for exploring school leadership in Botswana from an indigenous perspective. This background paper draws on African, indigenous and decolonial scholarship to outline an agenda and approach for researching school leadership in this context.
Dark satellites and the morphology of dwarf galaxies
Creators: name: Helmi, Amina
name: Sales, L. V.
name: Starkenburg, E.
name: Starkenburg, T. K.
name: Vera-Ciro, C. A.
name: De Lucia, G.
name: Li, Y. -S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: One of the strongest predictions of the LambdaCDM cosmological model is the presence of dark satellites orbiting all types of galaxies. We focus here on the dynamical effects of such satellites on disky dwarf galaxies, and demonstrate that these encounters can be dramatic. Although mergers with M_sat > M_d are not very common, because of the lower baryonic content they occur much more frequently on the dwarf scale than for L_*-galaxies. As an example, we present a numerical simulation of a 20% (virial) mass ratio merger between a dark satellite and a disky dwarf (akin to the Fornax dwarf galaxy in luminosity) that shows that the merger remnant has a spheroidal morphology. We conclude that perturbations by dark satellites provide a plausible path for the formation of dSph systems and also could trigger starbursts in gas rich dwarf galaxies. Therefore the transition from disky to the often amorphous, irregular, or spheroidal morphologies of dwarfs could be a natural consequence of the dynamical heating of hitherto unobservable dark satellites.
description: Submitted to ApJ Letters. 5 pages, 4 figures. A movie showing an encounter between a disky dwarf galaxy and a dark satellite can be found at http://www.astro.rug.nl/~ahelmi/dwarfs-morphologies.html
Ice-lens formation and geometrical supercooling in soils and other colloidal materials
Creators: name: Style, Robert W.
name: Peppin, Stephen S. L.
name: Cocks, Alan C. F.
name: Wettlaufer, John S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Geophysics (physics.geo-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We present a new, physically-intuitive model of ice-lens formation and growth during the freezing of soils and other dense, particulate suspensions. Motivated by experimental evidence, we consider the growth of an ice-filled crack in a freezing soil. At low temperatures, ice in the crack exerts large pressures on the crack walls that will eventually cause the crack to split open. We show that the crack will then propagate across the soil to form a new lens. The process is controlled by two factors: the cohesion of the soil, and the geometrical supercooling of the water in the soil; a new concept introduced to measure the energy available to form a new ice lens. When the supercooling exceeds a critical amount (proportional to the cohesive strength of the soil) a new ice lens forms. This condition for ice-lens formation and growth does not appeal to any ad hoc, empirical assumptions, and explains how periodic ice lenses can form with or without the presence of a frozen fringe. The proposed mechanism is in good agreement with experiments, in particular explaining ice-lens pattern formation, and surges in heave rate associated with the growth of new lenses. Importantly for systems with no frozen fringe, ice-lens formation and frost heave can be predicted given only the unfrozen properties of the soil. We use our theory to estimate ice-lens growth temperatures obtaining quantitative agreement with the limited experimental data that is currently available. Finally we suggest experiments that might be performed in order to verify this theory in more detail. The theory is generalizable to complex natural-soil scenarios, and should therefore be useful in the prediction of macroscopic frost heave rates.
description: Submitted to PRE
A Contribution to Secure the Routing Protocol "Greedy Perimeter Stateless Routing" Using a Symmetric Signature-Based AES and MD5 Hash
Creators: name: Erritali, Mohammed
name: Reda, Oussama Mohamed
name: Ouahidi, Bouabid El
Publisher: name: arXiv
Year: 2011
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: This work presents a contribution to secure the routing protocol GPSR (Greedy Perimeter Stateless Routing) for vehicular ad hoc networks, we examine the possible attacks against GPSR and security solutions proposed by different research teams working on ad hoc network security. Then, we propose a solution to secure GPSR packet by adding a digital signature based on symmetric cryptography generated using the AES algorithm and the MD5 hash function more suited to a mobile environment.
Relativistic Outflow Drives Gamma-Ray Emission in 3C345
Creators: name: Schinzel, F. K.
name: Lobanov, A. P.
name: Taylor, G. B.
name: Jorstad, S. G.
name: Marscher, A. P.
name: Zensus, J. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Aims: 3C345 was recently identified as a gamma-ray emitter, based on the first 20 months of Fermi-LAT data and optical monitoring. In this paper, a connection between the gamma-ray and optical variability of 3C345 and properties of its parsec-scale radio emission is investigated. Methods: The Fermi-LAT data of 3C345, covering an energy range of 0.1-300 GeV, were combined with 32 Very Long Baseline Array observations of the object made at 43.2 GHz in the period of January 2008 - March 2010. Results: The VLBA data reveal morphology and kinematics of the flow on scales of up to ~5 milliarcseconds (mas; deprojected linear distances of 380 parsecs). The brightness temperature, T_b(r), measured along the jet first decreases with distance proportional to r^-(0.95 +/-0.69) and later exhibits a break at ~0.3 mas, with T_b(r) proportional to r^-(4.11 +/-0.85) at larger separations. Variations of the gamma-ray, optical and parsec-scale radio emission show a similar long-term trend persistent during the entire VLBA monitoring period. The gamma-ray and optical variations on shorter time scales are related to structural changes in the jet on scales of ~0.3 mas (~23 parsecs, deprojected), with the gamma-ray and optical flares possibly related to the evolution of four distinct superluminal components identified in the flow. Conclusions: The observations indicate that both the quiescent and flaring components of the gamma-ray emission are produced in a region of the jet of ~23 pc in extent. This region may mark the Compton-loss dominated zone of the flow and its large extent may favor the synchrotron self-Compton mechanism for gamma-ray production in the relativistic jet of the quasar 3C345.
description: 10 pages, 6 figures, 2 tables, accepted for publication in Astronomy & Astrophysics
Preserving ecological processes: A decision support document for forest insect and disease managment in Jasper national park
Creators: name: Wilson, Niki Lynn
Publisher: name: Environmental Design
Year: 2000
Subjects: subject: SB764 .C34 W55 2000
subject: Forest insects - Alberta - Jasper National Park
subject: Trees - Diseases and pests - Alberta - Jasper National Park
subject: Vegetation management - Alberta - Jasper National Park
subject: Environmental management - Alberta - Jasper National Park
subject: Jasper National Park (Alta.)

description: Bibliography: p. 148-152
Neue Aspekte der kathetergeführten Ablation von Vorhofflimmern mittels Kryoballon Technik
Creators: name: Tscholl, Verena
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2022
Subjects: subject: Atrial fibrialltion
subject: catheter ablation
subject: Cryoballoon
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit

description: Die Vorhofflimmer-Ablation mittels Kryoballon-Technik ist eine moderne und effektive Alternative zur Radiofrequenz-Technik. Diese Arbeit beschäftigt sich mit dem klinischen Einsatz der Kryoballon-Technik für die Pulmonalvenenisolation bei Patienten mit symptomatischem Vorhofflimmern. Es konnte gezeigt werden, dass diese Technik auch in einem längeren klinischen Follow-up sicher und effektiv ist. Bei einer kontinuierlichen Überwachung des Herzrhythmus mittels Ereignisrekordern oder kardial implantierten elektronischen Geräten wurde diese Effektivität bestätigt. Patienten mit anatomischen Varianten wie eine gemeinsame linke Pulmonalvene können ebenso von einer Ablation mittels Kryoballon-Technik profitieren und wir konnten zeigen, dass diese den Ergebnissen der RF-Technik nicht unterlegen ist. Auch für ältere Patienten ist die Ablation mittels Kryoballon-Technik eine sichere und effektive Therapieoption. Letztlich bestätigten wir die mittlerweile gängige klinische Praxis, dass eine Pulmonalvenenisolation mittels Kryoballon-Technik sicher durchgeführt werden kann, wenn die Patienten mittels DOACs antikoaguliert sind.
description: Atrial fibrillation ablation using cryoballoon technology is a modern and effective alternative to radiofrequency ablation. This work shows data about the clinical use of the cryoballoon technique for pulmonary vein isolation in patients with symptomatic atrial fibrillation. This technique has been shown to be safe and effective even in a long term clinical follow-up. This effectiveness has been confirmed with constant monitoring of the heart rhythm using event recorders or other implantable cardiac devices. Patients with anatomical variants such as a common left pulmonary vein may also benefit from ablation using the cryoballoon technique and we have shown that this is not inferior to radiofrequency ablation. Ablation using the cryoballoon technique is a safe and effective therapy option for older patients. Finally, we confirmed the common clinical practice that pulmonary vein isolation using the cryoballoon technique can be safely performed when patients are anticoagulated using DOACs.
Residential electric lighting: Explorations in sustainable product design
Creators: name: Pearson, Shelley Lynn
Publisher: name: Environmental Design
Year: 1999
Subjects: subject: TH7975 .D8 P43 1999
subject: Dwellings - lighting
subject: Electric lighting
subject: Electric lighting - energy conservation
subject: Design, Industrial

description: Bibliography: p. 220-227
description: UARC
Data Confidentiality in Mobile Ad hoc Networks
Creators: name: Aldabbas, Hamza
name: Alwada'n, Tariq
name: Janicke, Helge
name: Al-Bayatti, Ali
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Mobile ad hoc networks (MANETs) are self-configuring infrastructure-less networks comprised of mobile nodes that communicate over wireless links without any central control on a peer-to-peer basis. These individual nodes act as routers to forward both their own data and also their neighbours' data by sending and receiving packets to and from other nodes in the network. The relatively easy configuration and the quick deployment make ad hoc networks suitable the emergency situations (such as human or natural disasters) and for military units in enemy territory. Securing data dissemination between these nodes in such networks, however, is a very challenging task. Exposing such information to anyone else other than the intended nodes could cause a privacy and confidentiality breach, particularly in military scenarios. In this paper we present a novel framework to enhance the privacy and data confidentiality in mobile ad hoc networks by attaching the originator policies to the messages as they are sent between nodes. We evaluate our framework using the Network Simulator (NS-2) to check whether the privacy and confidentiality of the originator are met. For this we implemented the Policy Enforcement Points (PEPs), as NS-2 agents that manage and enforce the policies attached to packets at every node in the MANET.
description: 12 pages
Composting of ethane pyrolysis quench sludge
Creators: name: Ducatel, Estelle Elisabeth
Publisher: name: University of Calgary
Year: 1999
Subjects: subject: TD899 .P4 D83 1999
subject: Petroleum waste--purification
subject: Biodegradation
subject: Ethanes
subject: Pyrolysis

description: Bibliography: p. 126-129
A Chiral SU(N) Gauge Theory Planar Equivalent to Super-Yang-Mills
Creators: name: Armoni, A.
name: Shifman, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the dynamics of a strongly coupled SU(N) chiral gauge theory. By using its large-N equivalence with N=1 super-Yang-Mills theory we find the vacuum structure of the former. We also consider its finite-N dynamics.
description: 10 pages, Latex. 1 eps figure
Queueing modeling for wireless mobile systems
Creators: name: Ou, Zhi Cong
Publisher: name: University of Calgary
Year: 1999
Subjects: subject: TK5103.2 .O9 1999
subject: Wireless communications systems
subject: Mobile communication systems
subject: Queuing theory
subject: Discrete-time systems
subject: Digital communications

description: Bibliography: p. 82-85
title: Εφαρμογές τρισδιάστατης απεικόνισης και εκτύπωσης σε αντικείμενα πολιτισμικής κληρονομιάς
title: Applications of 3D scanning and 3D printing in cultural heritage
titleType: AlternativeTitle
Creators: name: Σούλης, Ευάγγελος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2022
Subjects: 3D scanning
Τρισδιάστατη απεικόνιση
Τρισδιάστατη εκτύπωση
Πολιτισμική κληρονομιά
3D printers

description: Η παρούσα διπλωματική εργασία πραγματεύεται τις εφαρμογές της τεχνολογίας της τρισδιάστατης απεικόνισης και της τεχνολογίας της τρισδιάστατης εκτύπωσης σε αντικείμενα πολιτισμικής κληρονομιάς. Συγκεκριμένα στα ακόλουθα κεφάλαια αναλύονται οι τεχνικές συντήρησης και συμπλήρωσης που εφαρμόζονται από την αρχαιότητα ως σήμερα από τους αρχαιολόγους, παραδείγματα εφαρμογών των τεχνολογιών της τρισδιάστατης απεικόνισης και εκτύπωσης σε αντικείμενα πολιτισμικής κληρονομιάς και οι διαφορετικές τεχνολογίες τρισδιάστατων σαρωτών και εκτυπωτών με τα πλεονεκτήματα και τα μειονεκτήματα τους. Στα πλαίσια της εργασίας πραγματοποιήθηκε η σάρωση, η ψηφιακή αναπαράσταση, η επεξεργασία και η συμπλήρωση ενός γυάλινου σπασμένου αγγείου από τον αρχαιολογικό χώρο της Αταλάντης. Στην συνέχεια με την βοήθεια 3D εκτυπωτή δημιουργήθηκε ακριβές αντίγραφο του εκθέματος αλλά και κομμάτι συμπλήρωσης από πολυλακτίδιο (PLA) με σκοπό την τοποθέτηση του στο πρωτότυπο έκθεμα. Η ανάλυση των δύο τεχνολογιών καθώς και η εξοικείωση με αυτές μέσο του πειραματικού μέρους οδήγησαν σε συμπεράσματα αναφορικά με την χρησιμότητα τους στον τομέα της αρχαιολογίας και της προοπτικές που παρουσιάζουν για το μέλλον.
Dieter Buck, Burgen und Ruinen im nördlichen Schwarzwald. 33 Ausflüge auf den Spuren der Ritter
Creators: name: Heine, Hans-Wilhelm
Publisher: name: Burgen und Schlösser - Zeitschrift für Burgenforschung und Denkmalpflege
Year: 2020

description: Rezension zu: Dieter Buck, Burgen und Ruinen im nördlichen Schwarzwald. 33 Ausflüge auf den Spuren der Ritter, Stuttgart: Konrad Theiss Verlag GmbH 2002. 144 Seiten mit 43 Farbfotos und 34 Karten. Kartoniert. ISBN 3-8062-1601-0.
description: Burgen und Schlösser - Zeitschrift für Burgenforschung und Denkmalpflege, Bd. 43 Nr. 3 (2002): Burgen und Schlösser - Zeitschrift für Burgenforschung und Denkmalpflege
Optimization of volatile fatty acids production in full-scale fermenters
Creators: name: Long, Jennifer Erin
Publisher: name: University of Calgary
Year: 1999
Subjects: subject: TD758.5 .P56 L66 1999
subject: Sewage - Purification - Phosphate removal
subject: Sewage - Purification - Biological treatment
subject: Fatty acids
subject: Fermentation

description: Bibliography: p. 74-79
A low power high bandwidth four quadrant analog multiplier in 32 nm CNFET technology
Creators: name: Makwana, Ishit
name: Sheth, Vitrag
Publisher: name: arXiv
Year: 2012
Subjects: subject: Emerging Technologies (cs.ET)
subject: FOS: Computer and information sciences

description: Carbon Nanotube Field Effect Transistor (CNFET) is a promising new technology that overcomes several limitations of traditional silicon integrated circuit technology. In recent years, the potential of CNFET for analog circuit applications has been explored. This paper proposes a novel four quadrant analog multiplier design using CNFETs. The simulation based on 32nm CNFET technology shows that the proposed multiplier has very low harmonic distortion (<0.45%), large input range ({\pm}400mV), large bandwidth (~50GHz) and low power consumption (~247μW), while operating at a supply voltage of {\pm}0.9V.
Solid-liquid phase behavior of mixtures of n-alkanes
Creators: name: Paunovic, Irena
Publisher: name: University of Calgary
Year: 1999
Subjects: subject: QD305 .H6 P38 1999
subject: Alkanes - Thermal properties
subject: Solid-liquid equilibrium
subject: Phase rule and equilibrium
subject: Calorimeters and calorimetry

description: Bibliography: p. 156-160
Sensitivity to a possible variation of the Proton-to-Electron Mass Ratio of Torsion-Wagging-Rotation Transitions in Methylamine (CH3NH2)
Creators: name: Ilyushin, Vadim V.
name: Jansen, Paul
name: Kozlov, Mikhail G.
name: Levshakov, Sergei A.
name: Kleiner, Isabelle
name: Ubachs, Wim
name: Bethlem, Hendrick L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We determine the sensitivity to a possible variation of the proton-to-electron mass ratio μfor torsion-wagging-rotation transitions in the ground state of methylamine (CH3NH2). Our calculation uses an effective Hamiltonian based on a high-barrier tunneling formalism combined with extended-group ideas. The μ-dependence of the molecular parameters that are used in this model are derived and the most important ones of these are validated using the spectroscopic data of different isotopologues of methylamine. We find a significant enhancement of the sensitivity coefficients due to energy cancellations between internal rotational, overall rotational and inversion energy splittings. The sensitivity coefficients of the different transitions range from -19 to +24. The sensitivity coefficients of the 78.135, 79.008, and 89.956 GHz transitions that were recently observed in the disk of a z = 0.89 spiral galaxy located in front of the quasar PKS 1830-211 [S. Muller et al. Astron. Astrophys. 535, A103 (2011)] were calculated to be -0.87 for the first two and -1.4 for the third transition, respectively. From these transitions a preliminary upper limit for a variation of the proton to electron mass ratio of Δμ/μ< 9 x 10^{-6} is deduced.
Pre-main-sequence isochrones -- I. The Pleiades benchmark
Creators: name: Bell, Cameron P. M.
name: Naylor, Tim
name: Mayne, N. J.
name: Jeffries, R. D.
name: Littlefair, S. P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a critical assessment of commonly used pre-main-sequence isochrones by comparing their predictions to a set of well-calibrated colour-magnitude diagrams of the Pleiades in the wavelength range 0.4 to 2.5 microns. Our analysis shows that for temperatures less than 4000 K the models systematically overestimate the flux by a factor two at 0.5 microns, though this decreases with wavelength, becoming negligible at 2.2 microns. In optical colours this will result in the ages for stars younger than 10 Myr being underestimated by factors between two and three. We show that using observations of standard stars to transform the data into a standard system can introduce significant errors in the positioning of pre-main-sequences in colour-magnitude diagrams. Therefore we have compared the models to the data in the natural photometric system in which the observations were taken. Thus we have constructed and tested a model of the system responses for the Wide-Field Camera on the Isaac Newton Telescope. As a benchmark test for the development of pre-main-sequence models we provide both our system responses and the Pleiades sequence.
description: 15 pages, 12 figures, 7 tables, accepted for publication in MNRAS. All tables are available online at the Cluster Collaboration homepage http://www.astro.ex.ac.uk/people/timn/Catalogues/
Collisional Evolution of Ultra-Wide Trans-Neptunian Binaries
Creators: name: Parker, Alex H.
name: Kavelaars, J. J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The widely-separated, near-equal mass binaries hosted by the cold Classical Kuiper Belt are delicately bound and subject to disruption by many perturbing processes. We use analytical arguments and numerical simulations to determine their collisional lifetimes given various impactor size distributions, and include the effects of mass-loss and multiple impacts over the lifetime of each system. These collisional lifetimes constrain the population of small (R > ~1 km) objects currently residing in the Kuiper Belt, and confirm that the size distribution slope at small size cannot be excessively steep - likely q < ~3.5. We track mutual semi-major axis, inclination, and eccentricity evolution through our simulations, and show that it is unlikely that the wide binary population represents an evolved tail of the primordially-tight binary population. We find that if the wide binaries are a collisionally-eroded population, their primordial mutual orbit planes must have preferred to lie in the plane of the solar system. Finally, we find that current limits on the size distribution at small radii remain high enough that the prospect of detecting dust-producing collisions in real-time in the Kuiper Belt with future optical surveys is feasible.
description: Accepted for publication in the Astrophysical Journal
Enhanced Inter-Cell Interference Coordination Challenges in Heterogeneous Networks
Creators: name: Lopez-Perez, David
name: Guvenc, Ismail
name: de la Roche, Guillaume
name: Kountouris, Marios
name: Quek, Tony Q. S.
name: Zhang, Jie
Publisher: name: arXiv
Year: 2011
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: 3GPP LTE-Advanced has started a new study item to investigate Heterogeneous Network (HetNet) deployments as a cost effective way to deal with the unrelenting traffic demand. HetNets consist of a mix of macrocells, remote radio heads, and low-power nodes such as picocells, femtocells, and relays. Leveraging network topology, increasing the proximity between the access network and the end-users, has the potential to provide the next significant performance leap in wireless networks, improving spatial spectrum reuse and enhancing indoor coverage. Nevertheless, deployment of a large number of small cells overlaying the macrocells is not without new technical challenges. In this article, we present the concept of heterogeneous networks and also describe the major technical challenges associated with such network architecture. We focus in particular on the standardization activities within the 3GPP related to enhanced inter-cell interference coordination.
description: 12 pages, 4 figures, 2 tables
The Next Decade of Physics with PHENIX
Creators: name: Sickles, Anne
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The first decade of RHIC physics and the first heavy ion running at the LHC have produced a wealth of data and discoveries. It is timely to now evaluate what has been learned and ask what compelling new questions have been raised. In this talk, several key unanswered questions about the properties of the strongly coupled quark gluon plasma and the distribution of partons inside nucleons and nuclei will be discussed along with how they can be addressed experimentally. The PHENIX Collaboration has developed a plan for upgrading the experiment in order to address these new questions. The current status of these plans will be presented.
description: talk given at Quark Matter 2011
Near threshold all-optical backaction amplifier
Creators: name: McRae, Terry G.
name: Bowen, Warwick P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A near threshold all-optical backaction amplifier is realized. Operating near threshold in an integrated micronscale architecture allows a nearly three orders of magnitude improvement in both gain and optical power requirements over the only previous all-optical implementation, with 37 dB of gain achieved for only 12 uW of input power. Minor adjustments to parameters allows optical filtering with narrow bandwidth dictated by the mechanical quality factor. Operation at cryogenic temperatures may enable standard quantum limit surpassing measurements and ponderomotive squeezing.
description: 4 pages, 5 figures
Disciplinary experiences, math coursework, and racial/ethnic and gender inequality
Creators: name: Snidal, Matthew James
name: 0000-0002-4675-7741
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: Education
School discipline
Inequality
STEM
School suspension
Race
Ethnicity
Gender
Intersectionality

description: In the U.S., school discipline can have reverberating consequences for students. For example, students who receive out-of-school suspension tend to be less engaged in academic subjects, particularly the core subject of mathematics. Importantly, this process is stratified along the intersection of race/ethnicity and gender, with Black students more likely to be suspended than other groups of students and Black girls experiencing particularly large disparities in suspension relative to girls from other racial/ethnic backgrounds. To understand such disparities, scholars have employed labeling and life course theories to the experience of suspension, but have used narrow conceptualizations of suspension, most commonly whether a student was suspended in a time-period. This narrow conceptualization—and the simple binary operationalization that follows it—likely obscures important insights about the gendered and racialized implications of school suspension that could be better investigated through conceptualizing school suspension more dynamically. This dynamic conceptualization can be operationalized in three ways with student records from the Texas Education Agency (TEA) on out-of-school suspension during 9th grade: 1) the frequency dimension; 2) the duration dimension; and 3) the timing dimension. Drawing on a theoretical foundation integrating life course and labeling theories, this dissertation attempts to build on a broad base of empirical evidence by considering how disparities in suspension are dynamic, intersectional, cross-domain, and contextualized. In Chapter 1, I introduce the topics of school suspension and math course taking and present a conceptual model for the dissertation. In Chapter 2, I extend the dynamic perspective of suspension with an intersectional lens that captures how conceptualizations of suspension can portray disparities in different ways. In Chapter 3, I consider how dynamic suspension shapes outcomes math and how this connection varies across intersectional groups of students. In Chapter 4, the role of peer contexts is used to evaluate if the penalties of dynamic suspension vary according to whether the experience of suspension was more or less normative in the school. In Chapter 5, I present the theoretical and policy implications from the dissertation.
Interplay of structural and dynamical heterogeneity in the nucleation mechanism in Nickel
Creators: name: Díaz Leines, Grisell
name: Michaelides, Angelos
name: Rogal, Jutta
Publisher: name: Freie Universität Berlin
Year: 2022
Subjects: subject: nucleation mechanism in Ni
subject: metal alloys
subject: crystallization mechanism
subject: high-performance materials
subject: 500 Naturwissenschaften und Mathematik::530 Physik::530 Physik

description: Gaining fundamental understanding of crystal nucleation processes in metal alloys is crucial for the development and design of high-performance materials with targeted properties. Yet, crystallizationis a complex non-equilibrium process and, despite having been studied for decades, the microscopic aspects that govern the crystallization mechanism of a material remain to date elusive. Recent evidence shows that spatial heterogeneity in the supercooled liquid, characterised by extended regions with distinctive mobility and order, may be a key microscopic factor that determines the mechanism of crystal nucleation. These findings have revolutionised our view of the fundamental nature of crystallization, as most research has assumed that crystal clusters nucleate from random fluctuations in a ‘homogeneous’ liquid. Here, by analysing transition path sampling trajectories, we show that dynamical heterogeneity plays a key role in the mechanism of crystal nucleation in an elemental metal, nickel. Our results demonstrate that crystallization occurs preferentially in regions of low mobility in the supercooled liquid, evidencing the collective dynamical nature of crystal nucleation in Ni. In addition, our results show that low mobility regions form before and spatially overlap with pre-ordered domains that act as precursors to the crystal phase that subsequently emerges. Our results show a clear link between dynamical and structural heterogeneity in the supercooled liquid and its impact on the nucleation mechanism, revealing microscopic descriptors that could pave a novel way to control crystallization processes in metals.
The circadian clock regulates rhythmic erythropoietin expression in the murine kidney
Creators: name: Sciesielski, Lina K.
name: Felten, Matthias
name: Michalick, Laura
name: Kirschner, Karin M.
name: Lattanzi, Georgia
name: Jacobi, Charlotte L. J.
name: Wallach, Thomas
name: Lang, Veronika
name: Landgraf, Dominic
name: Kramer, Achim
name: Dame, Christof
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2021
Subjects: subject: chronobiology
subject: circadian rhythm
subject: clock
subject: cryptochrome
subject: erythropoietin
subject: hematopoiesis
subject: hypoxia-inducible factor
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit

description: Generation of circadian rhythms is cell-autonomous and relies on a transcription/translation feedback loop controlled by a family of circadian clock transcription factor activators including CLOCK, BMAL1 and repressors such as CRY1 and CRY2. The aim of the present study was to examine both the molecular mechanism and the hemopoietic implication of circadian erythropoietin expression. Mutant mice with homozygous deletion of the core circadian clock genes cryptochromes 1 and 2 (Cry-null) were used to elucidate circadian erythropoietin regulation. Wild-type control mice exhibited a significant difference in kidney erythropoietin mRNA expression between circadian times 06 and 18. In parallel, a significantly higher number of erythropoietin-producing cells in the kidney (by RNAscope®) and significantly higher levels of circulating erythropoietin protein (by ELISA) were detected at circadian time 18. Such changes were abolished in Cry-null mice and were independent from oxygen tension, oxygen saturation, or expression of hypoxia-inducible factor 2 alpha, indicating that circadian erythropoietin expression is transcriptionally regulated by CRY1 and CRY2. Reporter gene assays showed that the CLOCK/BMAL1 heterodimer activated an E-box element in the 5' erythropoietin promoter. RNAscope® in situ hybridization confirmed the presence of Bmal1 in erythropoietin-producing cells of the kidney. In Cry-null mice, a significantly reduced number of reticulocytes was found while erythrocyte numbers and hematocrit were unchanged. Thus, circadian erythropoietin regulation in the normoxic adult murine kidney is transcriptionally controlled by master circadian activators CLOCK/BMAL1, and repressors CRY1/CRY2. These findings may have implications for kidney physiology and disease, laboratory diagnostics, and anemia therapy.
Defining online resources typologies in art museums: online exhibitions and publications
Creators: name: Hidalgo Urbaneja, Maribel
Publisher: name: International Journal for Digital Art History
Year: 2020

description: As art museums undergo a digital transformation, institutions rethink physical exhibitions and print publications to create online resources which expand or replicate their traditional functions. Collection websites, online exhibitions, online publications, exhibition websites, and online exhibition catalogues coexist with interactive features which cannot be easily categorized in the previous typologies, the exhibition and the publication. Moreover, often these different types of online resources share characteristics and functions. This article intends to define two of the most relevant online resources typologies in art museums, the online exhibition and the online publication. The aim of it is to discuss and understand the importance of rethinking traditional typologies in the digital age. If typologies are necessary is because they help us to advance previous models. Both the definition and discussion are built upon the perspectives of art museums practitioners and a scholarly audience collected through interviews. The viewpoints of the two collectives help us understand existing conventions, preferences, and needs with regards to online exhibitions and publications in art museums.
description: International Journal for Digital Art History, No 4 (2019): Transformation of Institutions
BMSSM Higgs Bosons at the 7 TeV LHC
Creators: name: Carena, Marcela
name: Ponton, Eduardo
name: Zurita, Jose
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the Higgs sector in extensions of the Minimal Supersymmetric Standard Model by higher-dimension operators in the superpotential and the Kähler potential, in the context of Higgs searches at the LHC 7 TeV run. Such an effective field theory (EFT) approach, also referred to as BMSSM, allows for a model-independent description that may correspond to the combined effects of additional supersymmetric sectors, such as heavy singlets, triplets or gauge bosons, in which the supersymmetry breaking mass splittings can be treated as a perturbation. We consider the current LHC dataset, based on about $1-2 {\rm fb}^{-1}$ of data to set exclusion limits on a large class of BMSSM models. We also present projections for integrated luminosities of 5 and 15 fb$^{-1}$, assuming that the ATLAS and CMS collaborations will combine their results in each channel. Our study shows that the majority of the parameter space will be probed at the $2σ$ level with 15 fb$^{-1}$ of data. A non-observation of a Higgs boson with about 10 fb$^{-1}$ of data will point towards a Higgs SUSY spectrum with intermediate $\tan β$ ($\approx$ a few to 10) and a light SM-like Higgs with somewhat enhanced couplings to bottom and tau pairs. We define a number of BMSSM benchmark scenarios and analyze the possible exclusion/discovery channels and the projected required luminosity to probe them. We also discuss the results of the EFT framework for two specific models, one with a singlet superfield and one with SU(2)$_L$ triplets.
description: 34 pages, 7 figures
Temporal signatures of leptohadronic feedback mechanisms in compact sources
Creators: name: Petropoulou, Maria
name: Mastichiadis, Apostolos
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The hadronic model of Active Galactic Nuclei and other compact high energy astrophysical sources assumes that ultra-relativistic protons, electron-positron pairs and photons interact via various hadronic and electromagnetic processes inside a magnetized volume, producing the multiwavelength spectra observed from these sources. A less studied property of such systems is that they can exhibit a variety of temporal behaviours due to the operation of different feedback mechanisms. We investigate the effects of one possible feedback loop, where γ-rays produced by photopion processes are being quenched whenever their compactness increases above a critical level. This causes a spontaneous creation of soft photons in the system that result in further proton cooling and more production of γ-rays, thus making the loop operate. We perform an analytical study of a simplified set of equations describing the system, in order to investigate the connection of its temporal behaviour with key physical parameters. We also perform numerical integration of the full set of kinetic equations verifying not only our analytical results but also those of previous numerical studies. We find that once the system becomes `supercritical', it can exhibit either a periodic behaviour or a damped oscillatory one leading to a steady state. We briefly point out possible implications of such a supercriticality on the parameter values used in Active Galactic Nuclei spectral modelling, through an indicative fitting of the VHE emission of blazar 3C 279.
description: 19 pages, 20 figures, accepted for publication in MNRAS
Avalanche frontiers in dissipative abelian sandpile model as off-critical SLE(2)
Creators: name: Najafi, M. N.
name: Moghimi-Araghi, Saman
name: Rouhani, S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Avalanche frontiers in Abelian Sandpile Model (ASM) are random simple curves whose continuum limit is known to be a Schramm-Loewner Evolution (SLE) with diffusivity parameter $κ= 2$. In this paper we consider the dissipative ASM and study the statistics of the avalanche and wave frontiers for various rates of dissipation. We examine the scaling behavior of a number of functions such as the correlation length, the exponent of distribution function of loop lengths and gyration radius defined for waves and avalanches. We find that they do scale with the rate of dissipation. Two significant length scales are observed. For length scales much smaller than the correlation length, these curves show properties close to the critical curves and the corresponding diffusivity parameter is nearly the same as the critical limit. We interpret this as the ultra violet (UV) limit where $κ= 2$ corresponding to $c=-2$. For length scales much larger than the correlation length we find that the avalanche frontiers tend to Self-Avoiding Walk, the corresponding driving function is proportional to the Brownian motion with the diffusion parameter $κ=8/3$ corresponding to a field theory with $c = 0$. This is the infra red (IR) limit. Correspondingly the central charge decreases from the IR to the UV point.
description: 11 Pages, 6 Figures
Theoretical calculation of the phase behavior of colloidal membranes
Creators: name: Yang, Yasheng
name: Hagan, Michael F.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We formulate a density functional theory that describes the phase behavior of hard rods and depleting polymers, as realized in recent experiments on suspensions of \emph{fd} virus and non-adsorbing polymer. The theory predicts the relative stability of nematic droplets, stacked smectic columns, and a recently discovered phase of isolated monolayers of rods, or colloidal membranes. We find that a minimum rod aspect ratio is required for stability of colloidal membranes and that collective protrusion undulations are the dominant effect that stabilizes this phase. The theoretical predictions are shown to be qualitatively consistent with experimental and computational results.
description: 9.1 pages, 7 figures
Human patellofemoral kinematics and related joint surface geometry
Creators: name: Powers, Marilyn Joy
Publisher: name: University of Calgary
Year: 1999
Subjects: subject: QP303 .P69 1999
subject: Patellofemoral joint
subject: Joints--mechanical properties
subject: Kinematics
subject: Knee - Physiology
subject: Photogrammetry
subject: Engineering design

description: Bibliography: p.133-139.
Synthesis and biological activity of some novel side-chain analogues of brassinolide
Creators: name: Nakajima, Suanne K.
Publisher: name: University of Calgary
Year: 1997
Subjects: subject: QK898 .B85 N35 1997
subject: Brassinolide
subject: Brassinosteroids - Synthesis
subject: Plant regulators
subject: Plant hormones

description: Bibliography: p. 88-92
Dynamics of unbalanced rotors on rigid and flexible bearings
Creators: name: Jayasuriya Arachige, Tilak Asoka
Publisher: name: University of Calgary
Year: 1999
Subjects: subject: TJ1058 .J39 1999
subject: Rotors--Dynamics.
subject: Bearings (machinery)
subject: Turbomachines

description: Bibliography: p. 269-272