cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Sullivan Alliance to Transform the Health Professions: The First Five Years
Creators: name: UNSPECIFIED
Publisher: name: Digital Repository at the University of Maryland
Year: 2010
Subjects: Disparities
Policy

description: U.S. Government leaders throughout the twentieth century have attempted to address the inefficiencies of the nation’s health care system, and yet, costs continue to increase as access to care declines. Ethnic and racial minorities in the U.S., a growing segment of the population, are the most affected by persistent and ever widening health and healthcare disparities. These striking disparities in the health and wellness of our own population are made even more dramatic when our population’s health is compared to other countries. A major contributor to our inability to address these health disparities within the United States is our critical…
Θεωρία χωρητικότητας και δυναμικού πυκνωτών
Creators: name: Πουλιάσης, Σταμάτης Αλέξανδρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Πυκνωτής
Χωρητικότητα
Ενέργεια ισορροπίας
Μέτρο ισορροπίας
Δυναμικό ισορροπίας
Διακριτή ενέργεια
Condenser
Capacity
Equilibrium energy
Equilibrium measure
Equilibrium potential
Discrete energy

description: Το θέμα της διπλωματικής εργασίας είναι η μαθηματική θεωρία της χωρητικότητας και του δυναμικού πυκνωτών στο επίπεδο. Το πρώτο κεφάλαιο είναι μια εισαγωγή στη θεωρία δυναμικού στο επίπεδο στην οποία μελετάμε το λογαριθμικό δυναμικό, τη λογαριθμική χωρητικότητα, την αρχή Diridilex, τις συναρτήσεις Green, τη γενικευμένη λαπλασιανή, και τις ισοδυναμικές καμπύλες. Στο δεύτερο κεφάλαιο μελετάμε τους πυκνωτές στο επίπεδο και έννοιες που σχετίζονται με αυτούς όπως η χωηρικότητα, το μέτρο ισορροπίας, η ενέργεια ισορροπίας, η διακριτή ενέργεια και το δυναμικό ισορροπίας. Επίσης μελετάμε το δυναμικό και την ενέργεια ενός προσημασμένου Bored μέτρου στο Κ. Τέλος εξετάζουμε τη σχέση των παραπάνω εννοιών.
description: We study the mathematical theory of capacity and potential for plane condenser. The first chapter is an introduction to some basic notions from potential theory in the plane such of logarithmic potential, logarithmic capacity, Diridilex principle, Green functions, generalized laplacian and equipotential curves. in the second chapter we consider plane condenser and notions related with them such as capacity, equilibrum energy, equilibrum measure, discrete energy and equilibrum potential. Also we study the potential and the energy of a Borel signed measure in k. At the end we examine the relations between the above notions
How to induce superconductivity in epitaxial graphene $via$ remote proximity effect through an intercalated gold layer
Creators: name: Mazaleyrat, Estelle
name: Vlaic, Sergio
name: Artaud, Alexandre
name: Magaud, Laurence
name: Vincent, Thomas
name: Gómez-Herrero, Ana Cristina
name: Lisi, Simone
name: Singh, Priyank
name: Bendiab, Nedjma
name: Guisset, Valérie
name: David, Philippe
name: Pons, Stéphane
name: Roditchev, Dimitri
name: Chapelier, Claude
name: Coraux, Johann
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Graphene holds promises for exploring exotic superconductivity with Dirac-like fermions. Making graphene a superconductor at large scales is however a long-lasting challenge. A possible solution relies on epitaxially-grown graphene, using a superconducting substrate. Such substrates are scarce, and usually destroy the Dirac character of the electronic band structure. Using electron diffraction (reflection high-energy, and low-energy), scanning tunneling microscopy and spectroscopy, atomic force microscopy, angle-resolved photoemission spectroscopy, Raman spectroscopy, and density functional theory calculations, we introduce a strategy to induce superconductivity in epitaxial graphene $via$ a remote proximity effect, from the rhenium substrate through an intercalated gold layer. Weak graphene-Au interaction, contrasting with the strong undesired graphene-Re interaction, is demonstrated by a reduced graphene corrugation, an increased distance between graphene and the underlying metal, a linear electronic dispersion and a characteristic vibrational signature, both latter features revealing also a slight $p$ doping of graphene. We also reveal that the main shortcoming of the intercalation approach to proximity superconductivity is the creation of a high density of point defects in graphene (10$^{14}$~cm$^{-2}$). Finally, we demonstrate remote proximity superconductivity in graphene/Au/Re(0001), at low temperature.
description: 13 pages, 6 figures, to appear in 2D Materials
Emergence of a Helical Flux Rope Under an Active Region Prominence
Creators: name: Okamoto, Takenori J.
name: Tsuneta, Saku
name: Lites, Bruce W.
name: Kubo, Masahito
name: Yokoyama, Takaaki
name: Berger, Thomas E.
name: Ichimoto, Kiyoshi
name: Katsukawa, Yukio
name: Nagata, Shin'ichi
name: Shibata, Kazunari
name: Shimizu, Toshifumi
name: Shine, Richard A.
name: Suematsu, Yoshinori
name: Tarbell, Theodore D.
name: Title, Alan M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Continuous observations were obtained of active region 10953 with the Solar Optical Telescope (SOT) on board the \emph{Hinode} satellite during 2007 April 28 to May 9. A prominence was located over the polarity inversion line (PIL) in the south-east of the main sunspot. These observations provided us with a time series of vector magnetic fields on the photosphere under the prominence. We found four features: (1) The abutting opposite-polarity regions on the two sides along the PIL first grew laterally in size and then narrowed. (2) These abutting regions contained vertically-weak, but horizontally-strong magnetic fields. (3) The orientations of the horizontal magnetic fields along the PIL on the photosphere gradually changed with time from a normal-polarity configuration to a inverse-polarity one. (4) The horizontal-magnetic field region was blueshifted. These indicate that helical flux rope was emerging from below the photosphere into the corona along the PIL under the pre-existing prominence. We suggest that this supply of a helical magnetic flux into the corona is associated with evolution and maintenance of active-region prominences.
description: 10 pages, 2 figures, accepted for publication in ApJ Letters
Coronal transverse magnetohydrodynamic waves in a solar prominence
Creators: name: Okamoto, T. J.
name: Tsuneta, S.
name: Berger, T. E.
name: Ichimoto, K.
name: Katsukawa, Y.
name: Lites, B. W.
name: Nagata, S.
name: Shibata, K.
name: Shimizu, T.
name: Shine, R. A.
name: Suematsu, Y.
name: Tarbell, T. D.
name: Title, A. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Solar prominences are cool 10$^4$ Kelvin plasma clouds supported in the surrounding 10$^6$ Kelvin coronal plasma by as-yet undetermined mechanisms. Observations from \emph{Hinode} show fine-scale threadlike structures oscillating in the plane of the sky with periods of several minutes. We suggest these transverse magnetohydrodynamic waves may represent Alfvén waves propagating on coronal magnetic field lines and these may play a role in heating the corona.
description: 10 pages, 3 figures, published in Science (Hinode special issue)
Improved Higgs Naturalness with Supersymmetry
Creators: name: Gripaios, Ben
name: West, Stephen M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a supersymmetric model of electroweak symmetry-breaking exhibiting improved naturalness, wherein the stop mass can be pushed beyond the reach of the Large Hadron Collider without unnatural fine tuning. This implies that supersymmetry may still solve the hierarchy problem, even if it eludes detection at the LHC.
description: 4 pp., to appear in Proceedings of SUSY06, the 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions, UC Irvine, California, 12-17 June 2006
Η επιμόρφωση των στελεχών Πληροφορικής σε επιχειρήσεις της Βορείου Ελλάδος
Creators: name: Τοκαλατσίδης, Σωτήρης Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Επιμόρφωση
Στελέχη πληροφορικής
Επιχειρήσεις πληροφορικής
Ανάγκες επιμόρφωσης
Ερευνα στη Β. Ελλάδα
IT-executives
Training
North Greece

description: Τα στελέχη πληροφορικής διαδραματίζουν ένα σημαντικό ρόλο στις επιχειρήσεις. Οι αρμοδιότητες που έχουν καλύπτουν ένα ευρύ φάσμα εργασιών και περιέχουν εργασίες όπως προγραμματισμός, διοίκηση ομάδων, εκπαίδευση, καθοδήγηση και για το λόγο αυτό αποκτείται οι γνώσεις τους να είναι επαρκείς. Ετσι η επιμόρφωση έρχεται να καλύψει τα κενά αυτά, ώστε το στέλεχος να μπορεί να ανταποκριθεί στα καθήκοντά του. Η παρούσα εργασία ερευνά την επιμόρφωση των στελεχών πληροφορικής στην Βόρειο Ελλάδα και αναδεικνύει τις ανάγκες που έχουν τα στελέχη αυτά για επιμόρφωση τόσο σε δεξιότητες όσο και σε γενικές και ειδικές γνώσεις
description: This is an investigation about the training and training needs of the IT-executives in firms in North Greece
Fuzzy and discrete black hole models
Creators: name: Argota-Quiroz, J. N.
name: Majid, S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Using quantum Riemannian geometry, we solve for a Ricci=0 static spherically-symmetric solution in 4D, with the $S^2$ at each $t,r$ a noncommutative fuzzy sphere, finding a dimension jump with solutions having the time and radial form of a classical 5D Tangherlini black hole. Thus, even a small amount of angular noncommutativity leads to radically different radial behaviour, modifying the Laplacian and the weak gravity limit. We likewise provide a version of a 3D black hole with the $S^1$ at each $t,r$ now a discrete circle $\Bbb Z_n$, with the time and radial form of the inside of a classical 4D Schwarzschild black hole far from the horizon. We study the Laplacian and the classical limit $\Bbb Z_n\to S^1$. We also study the 3D FLRW model on $\Bbb R\times S^2$ with $S^2$ an expanding fuzzy sphere and find that the Friedmann equation for the expansion is the classical 4D one for a closed $\Bbb R\times S^3$ universe.
description: 32 pages AMSlatex, 5 figures. This is a sequel to arXiv:2005.13999 (gr-qc) (which just appeared in Class. Quantum Gravity.)
Magnetic shear-driven instability and turbulent mixing in magnetized protostellar disks
Creators: name: Bonanno, Alfio
name: Urpin, Vadim
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Observations of protostellar disks indicate the presence of the magnetic field of thermal (or superthermal) strength. In such a strong magnetic field, many MHD instabilities responsible for turbulent transport of the angular momentum are suppressed. We consider the shear-driven instability that can occur in protostellar disks even if the field is superthermal. This instability is caused by the combined influence of shear and compressibility in a magnetized gas and can be an efficient mechanism to generate turbulence in disks. The typical growth time is of the order of several rotation periods.
description: 8 pages, 6 figures, A&A to appear
Search for long-lived particles decaying into muon pairs at the Large Hadron Collider
Creators: name: Routray, Hardik
Publisher: name: No Publisher Supplied
Year: 2023

description: We performed a search for long-lived particles decaying into muon pairs using proton- proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS experiment at the LHC in 2017 and 2018, corresponding to an integrated luminosity of 101 fb−1. This is the first search of its kind using data sets that were collected with a novel dimuon scouting trigger stream, in order to explore otherwise inaccessible phase space at low dimuon mass and nonzero displacement from the primary interaction vertex. We didn’t observe any significant excess of events beyond the standard model expectation and set upper limits on branching fractions at 95% confidence level on a wide range of mass and lifetime hypotheses in beyond the standard model frameworks with the Higgs boson decaying into a pair of long-lived dark photons, or with a long-lived scalar resonance arising from a decay of a b hadron. The limits are the most stringent to date for substantial regions of the parameter space and our results show that general- purpose detectors like CMS and ATLAS can also be competitive with specific detectors like LHCb in the B-regime.
CSCCE Community Manager Case Study: Brielle Bennett
Creators: name: Bennett, Brielle
name: Pratt, Katie
name: Sidik, Saima
name: Woodley, Lou
Publisher: name: Zenodo
Year: 2022
Subjects: CSCCE
CSCCE Community Manager Case Study
scientific community manager
AGU LANDInG

description: This case study features Brielle Bennett, Community Manager at AGU LANDInG. It is part of an ongoing collection created by the Center for Scientific Collaboration and Community Engagement. It is part of our research into the nature of community manager roles and how they vary across the STEM ecosystem. You can find out more about the project, and view additional case studies in the collection, on our website. To find the case studies on Zenodo, click here. About CSCCE The Center for Scientific Collaboration and Community Engagement (CSCCE) champions the importance of human infrastructure for effective collaboration in STEM. We provide training and support for the people who make scientific collaborations succeed at scale - and we also research the impact of these emerging roles. Find out more about us on our website: CSCCE.org.
Picosecond time-resolved antibunching measures nanoscale exciton motion, annihilation, and true number of chromophores
Creators: name: Hedley, Gordon J.
name: Schröder, Tim
name: Steiner, Florian
name: Eder, Theresa
name: Hofmann, Felix
name: Bange, Sebastian
name: Laux, Dirk
name: Höger, Sigurd
name: Tinnefeld, Philip
name: Lupton, John M.
name: Vogelsang, Jan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The particle-like nature of light becomes evident in the photon statistics of fluorescence of single quantum systems as photon antibunching. In multichromophoric systems, exciton diffusion and subsequent annihilation occurs. These processes also yield photon antibunching but cannot be interpreted reliably. Here, we develop picosecond time-resolved antibunching (psTRAB) to identify and decode such processes. We use psTRAB to measure the true number of chromophores on well-defined multichromophoric DNA-origami structures, and precisely determine the distance-dependent rates of annihilation between excitons. Further, psTRAB allows us to measure exciton diffusion in mesoscopic H- and J-type conjugated-polymer aggregates. We distinguish between one-dimensional intra-chain and three-dimensional inter-chain exciton diffusion at different times after excitation and determine the disorder-dependent diffusion lengths. Our method provides a new lens through which excitons can be studied at the single-particle level, enabling the rational design of improved excitonic probes such as ultra-bright fluorescent nanoparticles, and materials for optoelectronic devices.
Ανάλυση σύντομων γραπτών μηνυμάτων μέσω κινητού τηλεφώνου (SMS): διδακτική αξιοποίηση στο γλωσσικό μάθημα
Creators: name: Καραπλή, Δέσποινα Ελευθερίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: SMS-επικοινωνία
Γραπτός-προφορικός λόγος
Speaking
Αυτοσχέδια χρήση της γλώσσας
Γλωσσική διδασκαλία
Sms-communication
Written vs spoken speech
Ad hoc language use
Language teaching

description: Η παρούσα εργασία ασχολείται με τα sms. Η προβληματική της εργασίας και η ερευνητική διαδικασία κινούνται στα πλαίσια της άποψης ότι ο ζωντανός σύγχρονος καθημερινός λόγος οφείλει να απασχολεί τη διδασκαλία της ξένης γλώσσας, καθώς αποτελεί σημαντικό κομμάτι της επικοινωνιακής πρακτικής. Υπό αυτήν την έννοια η ερευνητική προσφορά της παρούσας εργασίας έγκειται στο γεγονός ότι θα δώσει αποτελέσματα για την sms-επικοινωνία στην ελληνική γλώσσα με στόχο να νομιμοποιήσει τη χρήση των sms-κειμένων στο μάθημα και να αποδυναμώσει την υπεργενικευμένη άποψη ότι η γλώσσα απειλείται από παρόμοιες επικοινωνιακές εξελίξεις
description: This thesis focuses on sms texts. The framework of the problematic and the empirical process is that the foreign language teaching has to confront with the current up-to-date discourse, since it is an important piece of the communication between the native speakers of a language. Under this perspective this thesis steds light on the sms-communication in greek language and tries to legitimate the use of sms texts in the classroom. In addition to this it controverts the aspect that this kind of communication is a language threat
Ab initio calculations of electron affinity and ionization potential of carbon nanotubes
Creators: name: Buonocore, F.
name: Trani, F.
name: Ninno, D.
name: Di Matteo, A.
name: Cantele, G.
name: Iadonisi, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: By combining ab initio all-electron localized orbital and pseudopotential plane-wave approaches we report on calculations of the electron affinity (EA) and the ionization potential (IP) of (5, 5) and (7, 0) single-wall carbon nanotubes. The role played by finite-size effects and nanotube termination has been analysed by comparing several hydrogen-passivated and not passivated nanotube segments. The dependence of the EA and IP on both the quantum confinement effect, due to the nanotube finite length, and the charge accumulation on the edges, is studied in detail. Also, the EA and IP are compared to the energies of the lowest unoccupied and highest occupied states, respectively, upon increasing the nanotube length. We report a slow convergence with respect to the number of atoms. The effect of nanotube packing in arrays on the electronic properties is eventually elucidated as a function of the intertube distance.
O'ZBEK VA INGLIZ TILLARIDAGI URF-ODAT IFODALOVCHI LEKSIK BIRLIKLARNING MILLIY MADANIY XUSUSIYATLARI
Creators: name: Mo'ydinova, Maftunaxon
Publisher: name: Zenodo
Year: 2024

description: Ushbu tezisda o‘zbek va ingliz tillaridagi urf-odatlarni ifodalovchi leksik birliklar tahlil qilinadi hamda ularning milliy-madaniy xususiyatlari o‘rganiladi. Turli xalqlar madaniyatini aks ettiruvchi ushbu birliklar tili va madaniyati o‘rtasidagi o‘zaro bog‘liqlikni ochib beradi. O‘zbek va ingliz tillaridagi urf-odatlar, marosimlar, an’analarning leksik birikmalari lisoniy vositalar orqali qanday ifoda etilishi va ularning semantik tarkibi tadqiq qilinadi. Shuningdek, ushbu leksik birliklarning tarjima qilinishi va boshqa madaniyatga o‘tkazilishi jarayonida yuzaga keladigan qiyinchiliklar ko‘rib chiqiladi. Tezis urf-odatlar va madaniyatlarni o‘zaro tushunish va madaniyatlararo muloqotga qo‘shadigan hissasini yoritishga qaratilgan.
ALCUNI METODI PER MISURARE L'INTENSITA' DEL CAMPO 'B' NELL'INTRAFERRO DEL SINCROTRONE
Creators: name: C.CANARUTTO
Publisher: name: INFN Open Access Repository
Year: 1953

description: Si vuole misurare l'intensita' del campo magnetico B nell'interferro del sincrotrone, con metodi che diano il B direttamente e non attraverso il valore della sua derivata.
Trémaux trees and planarity
Creators: name: De Fraysseix, Hubert
name: De Mendez, Patrice Ossona
name: Rosenstiehl, Pierre
Publisher: name: arXiv
Year: 2006
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C10, 05C85, 05C75

description: We present a simplified version of the DFS-based Left-Right planarity testing and embedding algorithm implemented in Pigale which has been considered as the fastest implemented one [J.M. Boyer, P.F. Cortese, M. Patrignani, and G. Di Battista. Stop minding your P's and Q's: implementing fast and simple DFS-based planarity and embedding algorithm. In Graph Drawing, volume 2912 of Lecture Notes in Computer Science, pages 25-36. Springer, 2004.]. We give here a simple full justification of the algorithm, based on a preliminary extended study of topological properties of DFS trees.
description: Special Issue on Graph Drawing
Σχέση των επιπέδων του κοινού ευρωπαϊκού πλαισίου αναφοράς και του προγράμματος αγγλικής γλώσσας του ελληνικού δημοσίου γυμνασίου
Creators: name: Μανώλη, Πολυξένη Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Κοινό Ευρωπαϊκό Πλαίσιο Αναφοράς
Επίπεδα
Αναλυτικό Πρόγραμμα Αγγλικής Γλώσσας
Γυμνάσιο
Common European Framework of reference
Levels
Curriculum
Gymnasium

description: Μελετώντας προσεκτικά το αναλυτικό πρόγραμμα αγγλικής γλώσσας, το οποίο ανήκει στην κατηγορία των α.π. με μορφή curriculum, στη γυμνασιακή βαθμίδα προκύπτει ότι το επίπεδο αγγλομάθειας των μαθητών αντιστοιχεί στο επίπεδο Β1 σύμφωνα με τα επίπεδα που ορίζει το Κοινό Ευρωπαϊκό Πλαίσιο Αναφοράς του Συμβουλίου της Ευρώπης
description: Through the careful study of the timetable of the Gymnasium which belongs to the category of curriculum. I come to the conclusion that the level of the english language the children arrive at when they finish school corresponds to the level B1 according to the levels of the common european framework of reference of the Council of europe
On the Estimation of Circumbinary Orbital Properties
Creators: name: Bromley, Benjamin C.
name: Kenyon, Scott J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We describe a fast, approximate method to characterize the orbits of satellites around a central binary in numerical simulations. A goal is to distinguish the free eccentricity -- random motion of a satellite relative to a dynamically cool orbit -- from oscillatory modes driven by the central binary's time-varying gravitational potential. We assess the performance of the method using the Kepler-16, Kepler-47, and Pluto-Charon systems. We then apply the method to a simulation of orbital damping in a circumbinary environment, resolving relative speeds between small bodies that are slow enough to promote mergers and growth. These results illustrate how dynamical cooling can set the stage for the formation of Tatooine-like planets around stellar binaries and the small moons around the Pluto-Charon binary planet.
description: 24 pages with 7 figures and 3 tables, AJ, in press
n-Monotone exact functionals
Creators: name: de Cooman, Gert
name: Troffaes, Matthias C. M.
name: Miranda, Enrique
Publisher: name: arXiv
Year: 2008
Subjects: subject: Functional Analysis (math.FA)
subject: Probability (math.PR)
subject: FOS: Mathematics

description: We study n-monotone functionals, which constitute a generalisation of n-monotone set functions. We investigate their relation to the concepts of exactness and natural extension, which generalise the notions of coherence and natural extension in the behavioural theory of imprecise probabilities. We improve upon a number of results in the literature, and prove among other things a representation result for exact n-monotone functionals in terms of Choquet integrals.
The K/pi ratio and the lifespan of the fireball
Creators: name: Tomasik, Boris
name: Kolomeitsev, Evgeni E
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We construct a hadronic kinetic model for description of excitation functions of multiplicity ratios K+/pi+, K-/pi-, and Lambda/pi. It is shown that the model is able to describe data rather well under the assumption that the total lifespan of the fireball is decreasing function of the collision energy for SPS energies above 30 AGeV. Thus in order to identify the onset of deconfinement the proposed model will have to be checked against other kinds of data until hadronic description can be safely falsified.
description: proceedings of International workshop on Critical Point and Onset of Deconfinement, Florence, July 3-6, 2006
Higgs Production in Association with a Dark-Z at Future Electron Positron Colliders
Creators: name: Giffin, Pierce
name: Lewis, Ian M.
name: Zheng, Ya-Juan
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In recent years there have been many proposals for new electron-positron colliders, such as the Circular Electron-Positron Collider, the International Linear Collider, and the Future Circular Collider in electron-positron mode. Much of the motivation for these colliders is precision measurements of the Higgs boson and searches for new electroweak states. Hence, many of these studies are focused on energies above the $h\,Z$ threshold. However, there are proposals to run these colliders at the lower $WW$ threshold and $Z$-pole energies. In this paper, we propose a new search for Higgs physics accessible at lower energies: $e^+e^-\rightarrow h\,Z_d$, where $Z_d$ is a new light gauge boson such as a dark photon or dark-$Z$. Such searches can be conducted at the $WW$ threshold, i.e. energies below the $h\,Z$ threshold where exotic Higgs decays can be searched for in earnest. Additionally, due to very good angular and energy resolution at future electron-positron colliders, these searches will be sensitive to $Z_d$ masses below 1 GeV, which is lower than the current direct LHC searches. We will show that at $\sqrt{s}=160$ GeV with 10 ab$^{-1}$, a search for $e^+e^-\rightarrow h\,Z_d$ is sensitive to $h-Z-Z_d$ couplings of $δ\sim 8\times 10^{-3}$ and cross sections of $\sim 1-2$ ab for $Z_d$ masses below 1 GeV. The results are similar at $\sqrt{s}=240$ GeV with 5 ab$^{-1}$.
description: 19 pages, 4 figures, 3 tables
An investigation into using artificial neural networks for empirical design in the mining industry
Creators: name: Miller-Tait, Logan
Publisher: name: University of British Columbia
Year: 2009

description: The mining industry relies heavily upon empirical analysis for design and prediction. Neural networks are computer programs that use parallel processing, similar to the human brain, to analyze data for trends and correlation. Neural networks will analyze input factors by assigning a weighting or numerical value to each input factor or each input factor combination. This is done to provide an estimate or prediction for an output factor. As more information becomes available the neural network will continually adjust and change the input factor weightings to improve output prediction. The objective of this thesis is to see if neural networks can provide assistance in analyzing data within the mining industry. Neural networks were used to study rockburst prediction, ELOS (equivalent linear overbreak/slough ), and dilution estimates in open stopes. There were two aspects of the neural network rockburst prediction analysis. The first aspect was to see if the neural network could predict rockbursts through the physical inputs such as RMR and span. The neural network was very successful in predicting rockbursts. The other aspect of the rockburst study was to see if neural networks, using seismic data, could predict when a rockburst would occur. The neural networks were unsuccessful in predicting when a rockburst would occur. Further analysis with seismic data presented in a different format may improve results. Neural networks were also used in this study to assist in ELOS prediction. A joint UBC - Canmet research project ( Clarke, 1997 ) recorded ELOS from 75 open stopes while recording 23 relevant input factors for each stope. This neural net analysis was conducted to assist in determining the most relevant factors. Rock quality, particularly RMR, proved to be the most significant factor in ELOS determination. Blasting factors such as blasthole diameter, length, and layout were also very relevant and helped predict outlier points. This analysis shows some potential advantages and shortcomings of using neural networks in the mineral industry. The final neural network was to compare open stope dilution formula estimates with neural network estimates. Using the same database for neural net training as the formula derivation, the neural net dilution estimates on unseen data were, on average, more accurate than the formula predictions. The conclusion focuses on how neural networks could be practically applied in the mining industry.
Enhance the Efficiency of Heuristic Algorithm for Maximizing Modularity Q
Creators: name: Hu, Yanqing
name: Wu, Jinshan
name: Di, Zengru
Publisher: name: arXiv
Year: 2008
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Modularity Q is an important function for identifying community structure in complex networks. In this paper, we prove that the modularity maximization problem is equivalent to a nonconvex quadratic programming problem. This result provide us a simple way to improve the efficiency of heuristic algorithms for maximizing modularity Q. Many numerical results demonstrate that it is very effective.
description: 9 pages, 3 figures
Tunneling Anisotropic Magnetoresistance in Co/AlOx/Au Tunnel Junctions
Creators: name: Liu, R. S.
name: Michalak, L.
name: Canali, C. M.
name: Samuelson, L.
name: Pettersson, H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: We observe spin-valve-like effects in nano-scaled thermally evaporated Co/AlOx/Au tunnel junctions. The tunneling magnetoresistance is anisotropic and depends on the relative orientation of the magnetization direction of the Co electrode with respect to the current direction. We attribute this effect to a two-step magnetization reversal and an anisotropic density of states resulting from spin-orbit interaction. The results of this study points to future applications of novel spintronics devices involving only one ferromagnetic layer.
description: 11 pages, 5 figures. Accpted for publishing on Nano Letters, 2008
Transport in chemically doped graphene in the presence of adsorbed molecules
Creators: name: Hwang, E. H.
name: Adam, S.
name: Sarma, S. Das
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Motivated by a recent experiment reporting on the possible application of graphene as sensors, we calculate transport properties of 2D graphene monolayers in the presence of adsorbed molecules. We find that the adsorbed molecules, acting as compensators that partially neutralize the random charged impurity centers in the substrate, enhance the graphene mobility without much change in the carrier density. We predict that subsequent field-effect measurements should preserve this higher mobility for both electrons and holes, but with a voltage induced electron-hole asymmetry that depends on whether the adsorbed molecule was an electron or hole donor in the compensation process. We also calculate the low density magnetoresistance and find good quantitative agreement with experimental results.
description: Revised version, accepted for publication in Phys. Rev. B
Τα ομοφυλόφιλα ζευγάρια στην Ελλάδα: ζητήματα ιδιωτικού διεθνούς δικαίου
Creators: name: Κονσούλη, Στεφανία Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Ομοφυλόφυλα ζευγάρια
Ομοφυλοφυλικός γάμος
Ληξιαρχικά καταχωρημένη σχέση
Ελεύθερη ένωση
Ιδιωτικό διεθνές δίκαιο
Homosexual couples
Same sex marriage
Registered partnership
Private international law

description: Το ελληνικό δίκαιο δεν περιλαμβάνει καμία διάταξη σχετική με τη ρύθμιση της προσωπικής και της περιουσιακής κατάστασης των ομοφυλόφιλων ζευγαριών. Αντίθετα, τα δίκαια πολλών άλλων κρατών προσφέρουν πλέον στους ομοφυλόφιλους είτε το θεσμό του γάμου είτε άλλους αντίστοιχους θεσμούς, οι οποίοι έχουν παρόμοιες έννομες συνέπειες με το γάμο. Τα ελληνικά δικαστήρια αργά ή γρήγορα θα κληθούν να αποφασίσουν σχετικά με έναν γάμο ή μία παρόμοια έννομη σχέση μεταξύ ομοφυλόφιλων ατόμων, η οποία έχει συναφθεί νόμιμα σε κάποια άλλη πολιτεία. Η παρούσα μελέτη επιχειρεί να δώσει απαντήσεις στα ενδεχόμενα ερωτήματα που θα τεθούν στα πλαίσια μίας τέτοιας δίκης, με άλλα λόγια επιχειρεί τον εντοπισμό και την επίλυση των ενδεχόμενων ιδιωτικοδιεθνολογικών προβλημάτων. Επιπλέον, περιλαμβάνεται η συνοπτική περιγραφή των ρυθμίσεων που έχουν θεσπιστεί σε άλλες έννομες τάξεις καθώς και η περιγραφή των εξελίξεων που έχουν λάβει χώρα μέχρι στιγμής στο συλλογικό ευρωπαϊκό επίπεδο, οι οποίες έχουν αντίκτυπο και στην Ελλάδα ως κράτος-μέλος της Ευρωπαϊκής Ένωσης.
description: There is no provision in Greek Law concerning the regulation of homosexual relationships. On the contrary, many other countries offer homosexual couples the possibility to marry or to register their partnership. Sooner or later Greek courts will have to deal with cases concerning the status of same-sex couples that have been legally married or registered abroad. This dissertation attempts to give answers to the possible questions that will arise in the course of a relevant trial or, in other words, to identify and solve the possible private international law problems. Furthermore, it includes the description of the relevant provisions adopted in other countries and of the recent developments on the European level, which obviously affect Greece as a member-state of the European Union.
Scaling Laws in the Cosmic Structure and Renormalization Group
Creators: name: Gaite, Jose
name: Dominguez, Alvaro
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: There is evidence of a scale-invariant matter distribution up to scales over 10 Megaparsecs. We review scaling (fractal or multifractal) models of large scale structure and their observational evidence. We conclude that the dynamics of cosmological structure formation seems to be driven to a multifractal attractor. This supports previous studies, which we review, of structure formation by means of the renormalization group within a hydrodynamic formulation.
description: 8 pages, IOP LaTeX
Projective embeddings of homogeneous spaces with small boundary
Creators: name: Arzhantsev, Ivan V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Geometry (math.AG)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 14L24; 14L30; 14M17

description: We study open equivariant projective embeddings of homogeneous spaces such that the complement of the open orbit does not contain divisors. Criterions of existence of such an embedding are considered and finiteness of isomorphism classes of embeddings for a given homogeneous space is proved. Any embedding with small boundary is realized as a GIT-quotient associated with a linearization of the trivial line bundle on the space of the canonical embedding. The generalized Cox's construction and the theory of bunched rings allow us to describe basic geometric properties of embeddings with small boundary in combinatorial terms.
description: 15 pages
Dynamics of Vortex Shells in Mesoscopic Superconducting Corbino Disks
Creators: name: Misko, V. R.
name: Peeters, F. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In mesoscopic superconducting disks vortices form shell structures as recently observed in Nb disks. We study the dynamics of such vortices, driven by an external current I_0, in a Corbino setup. At very low I_0, the system exhibits rigid body rotation while at some critical current I_c,i vortex shells rotate separately with angular velocities omega_i. This critical current I_c,i has a remarkable non-monotonous dependence on the applied magnetic field which is due to a dynamically-induced structural transition with a rearrangement of vortices over the shells similar to the Coster-Kronig transition in hollow atoms. Thermally-activated externally-driven flux motion in a disk with pinning centers explains experimentally observed omega_i as a function of I_0 and T and the dynamically-induced melting transition.
description: 5 pages, 5 figures
Leveraging MPI RMA to optimise halo-swapping communications in MONC on Cray machines
Creators: name: Brown, Nick
name: Bareford, Michael
name: Weiland, Michèle
Publisher: name: arXiv
Year: 2020
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Remote Memory Access (RMA), also known as single sided communications, provides a way of accessing the memory of other processes without having to issue explicit message passing style communication calls. Previous studies have concluded that MPI RMA can provide increased performance over traditional MPI Point to Point (P2P) but these are based on synthetic benchmarks. In this work, we replace the existing non-blocking P2P communication calls in the MONC atmospheric model with MPI RMA. We describe our approach in detail and discuss options taken for correctness and performance. Experiments on illustrate that by using RMA we can obtain between a 5\% and 10\% reduction in communication time at each timestep on up to 32768 cores, which over the entirety of a run (of many timesteps) results in a significant improvement in performance compared to P2P. However, RMA is not a silver bullet and there are challenges when integrating RMA into existing codes: important optimisations are necessary to achieve good performance and library support is not universally mature. In this paper we discuss, in the context of a real world code, the lessons learned converting P2P to RMA, explore performance and scaling challenges, and contrast alternative RMA synchronisation approaches in detail.
description: This is the pre-peer reviewed version of the following article: Leveraging MPI RMA to optimise halo-swapping communications in MONC on Cray machines, which has been published in final form at https://doi.org/10.1002/cpe.5008
Dynamics in polyelectrolyte/microemulsion complexes
Creators: name: Simon, Miriam
name: Gradzielski, Michael
name: Hoffmann, Ingo
Publisher: name: Technische Universität Berlin
Year: 2020
Subjects: subject: 540 Chemie und zugeordnete Wissenschaften
subject: oil-in-water microemulsion
subject: carriers
subject: hydrophobic molecules

description: Oil-in-water (O/W) microemulsion droplets are convenient carriers for hydrophobic molecules in an aqueous phase and are used for a wide range of applications. We studied weakly charged O/W microemulsion droplets complexed with oppositely charged polyacrylates that form long linear arrangements of droplets. All samples showed rather low viscosities, which is in contrast to similar systems of hydrophobically interconnected droplets. Here, we applied small-angle neutron scattering, dynamic light scattering and neutron spin-echo spectroscopy to characterise the dynamic properties of polyacrylate/microemulsion complexes in order to understand the origin of the low-viscous behaviour. We found that the electrostatic interactions lead to very dynamic complexes with high exchange rates of droplets and only a fraction of the droplets is contained within the transient complexes at a given time. These results were only accessible by the combination of different methods as one method alone would have given an incomplete picture.
Transcript of: Karl Friston, 1st Applied Active Inference Symposium, Active Inference Lab, June 21, 2021
Creators: name: Friston, Karl
name: Douglass, David Standish
name: Iennaco de Vasconcelos, Maria Luiza
name: Sillett, Stephen
name: Sganzerla, Lorena
name: Tickles, Dean
name: Metelkin, Ivan
name: Vyatkin, Alex
name: Friedman, Daniel Ari
Publisher: name: Zenodo
Year: 2021
Subjects: Active Inference
Free Energy Principle
Symposium
ActInfLab
Bayesian Inference
Education
Communication
Tools
Generative Model

description: On June 21st, 2021, Active Inference Lab (activeinference.org/) hosted its first Applied Active Inference Symposium, featuring Professor Karl Friston. The Symposium was structured in three sections, corresponding to the Organizational Units of the Active Inference Lab: Education, Communication, and Tools. This publication reflects an edited and enriched transcript of the proceedings of the Symposium.
3d-electron induced magnetic phase transition in half-metallic semi-Heusler alloys
Creators: name: Galanakis, I.
name: Sasioglu, E.
name: Ozdogan, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study the effect of the non-magnetic 3\textit{d} atoms on the magnetic properties of the half-metallic (HM) semi-Heusler alloys Co$_{1-x}$Cu$_{x}$MnSb and Ni$_{1-x}$Cu$_{x}$MnSb ($0 \leq x \leq 1$) using first-principles calculations. We determine the magnetic phase diagram of both systems at zero temperature and obtain a phase transition from a ferromagnetic to an antiferromagnetic state. For low Cu concentrations the ferromagnetic RKKY-like exchange mechanism is dominating, while the antiferromagnetic superexchange coupling becomes important for larger Cu content leading to the observed magnetic phase transition. A strong dependence of the magnetism in both systems on the position of the Fermi level within the HM gap is obtained. Obtained results are in good agreement with the available experimental data.
Burrowing dynamics of aquatic worms in soft sediments
Creators: name: Kudrolli, Arshad
name: Ramirez, Bernny
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: We investigate the dynamics of \textbf{\textit{Lumbriculus variegatus}} in water-saturated sediment beds to understand limbless locomotion in the benthic zone found at the bottom of lakes and oceans. These slender aquatic worms are observed to perform elongation-contraction and transverse undulatory strokes in both water-saturated sediments and water. Greater drag anisotropy in the sediment medium is observed to boost the burrowing speed of the worm compared to swimming in water with the same stroke using drag-assisted propulsion. We capture the observed speeds by combining the calculated forms based on resistive-force theory of undulatory motion in viscous fluids and a dynamic anchor model of peristaltic motion in the sediments. Peristalsis is found to be effective for burrowing in non-cohesive sediments which fill in rapidly behind the moving body inside the sediment bed. Whereas, the undulatory stroke is found to be effective in water and in shallow sediment layers where anchoring is not possible to achieve peristaltic motion. We show that such dual strokes occur as well in the earthworm \textbf{\textit{Eisenia fetida}} which inhabit moist sediments that are prone to flooding. Our analysis in terms of the rheology of the medium shows that the dual strokes are exploited by organisms to negotiate sediment beds that may be packed heterogeneously, and can be used by active intruders to move effectively from a fluid through the loose bed surface layer which fluidize easily to the well-consolidated bed below.
description: 6 pages, 6 figures
Simulating non-Hermitian dynamics of a multi-spin quantum system and an emergent central spin model
Creators: name: Varma, Anant V.
name: Das, Sourin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: It is possible to simulate the dynamics of a single spin-$1/2$ ($\mathsf{PT~}$ symmetric) system by conveniently embedding it into a subspace of a larger Hilbert space with unitary dynamics. Our goal is to formulate a many body generalization of this idea i.e., embedding many body non-Hermitian dynamics. As a first step in this direction, we investigate embedding of "$N$" non-interacting spin-$1/2$ ($\mathsf{PT~}$ symmetric) degrees of freedom, thereby unfolding the complex nature of such an embedding procedure. It turns out that the resulting Hermitian Hamiltonian represents a cluster of $N+1$ spin halves with "all to all", $q$-body interaction terms ($q=1,...,N+1$) in which the additional spin-$1/2$ is a part of the larger embedding space. We can visualize it as a strongly correlated central spin model with the additional spin-$1/2$ playing the role of central spin. We find that due to the orthogonality catastrophe, even a vanishing small exchange field applied along the anisotropy axis of the central spin leads to a strong suppression of its decoherence arising from spin-flipping perturbations.
description: 10 pages, 5 figures
Quantitative photo-crosslinking mass spectrometry revealing protein structure response to environmental changes
Creators: name: Müller, Fränze
name: Graziadei, Andrea
name: Rappsilber, Juri
Publisher: name: Technische Universität Berlin
Year: 2019
Subjects: subject: 540 Chemie und zugeordnete Wissenschaften
subject: peptides
subject: proteins
subject: monomers
subject: pH
subject: cluster chemistry
subject: conformational transitions

description: Protein structures respond to changes in their chemical and physical environment. However, studying such conformational changes is notoriously difficult, as many structural biology techniques are also affected by these parameters. Here, the use of photo-crosslinking, coupled with quantitative crosslinking mass spectrometry (QCLMS), offers an opportunity, since the reactivity of photo-crosslinkers is unaffected by changes in environmental parameters. In this study, we introduce a workflow combining photo-crosslinking using sulfosuccinimidyl 4,4′-azipentanoate (sulfo-SDA) with our recently developed data-independent acquisition (DIA)-QCLMS. This novel photo-DIA-QCLMS approach is then used to quantify pH-dependent conformational changes in human serum albumin (HSA) and cytochrome C by monitoring crosslink abundances as a function of pH. Both proteins show pH-dependent conformational changes resulting in acidic and alkaline transitions. 93% and 95% of unique residue pairs (URP) were quantifiable across triplicates for HSA and cytochrome C, respectively. Abundance changes of URPs and hence conformational changes of both proteins were visualized using hierarchical clustering. For HSA we distinguished the N–F and the N–B form from the native conformation. In addition, we observed for cytochrome C acidic and basic conformations. In conclusion, our photo-DIA-QCLMS approach distinguished pH-dependent conformers of both proteins.
Towards Cosmological Simulations of Dark Matter on Quantum Computers
Creators: name: Mocz, Philip
name: Szasz, Aaron
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: State-of-the-art cosmological simulations on classical computers are limited by time, energy, and memory usage. Quantum computers can perform some calculations exponentially faster than classical computers, using exponentially less energy and memory, and may enable extremely large simulations that accurately capture the whole dynamic range of structure in the Universe within statistically representative cosmic volumes. However, not all computational tasks exhibit a `quantum advantage'. Quantum circuits act linearly on quantum states, so nonlinearities (e.g. self-gravity in cosmological simulations) pose a significant challenge. Here we outline one potential approach to overcome this challenge and solve the (nonlinear) Schrodinger-Poisson equations for the evolution of self-gravitating dark matter, based on a hybrid quantum-classical variational algorithm framework (Lubasch 2020). We demonstrate the method with a proof-of-concept mock quantum simulation, envisioning a future where quantum computers will one day lead simulations of dark matter.
description: 10 pages, 3 figures, submitted to ApJ, referee comments incorporated