cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Brain network pattern analysis with positron emission tomography data : application to Parkinson's disease
Creators: name: Fu, FangLu Jessie
Publisher: name: University of British Columbia
Year: 2020

description: Positron emission tomography (PET) is commonly used to investigate changes within the brain due to aging and disease. Because our brain works as an integrated system where multiple brain regions work together to perform complex tasks, network pattern analyses (a subset of machine-learning methods) are often found to provide complementary, more sensitive and more robust information compared to traditional univariate analyses, especially in the field of magnetic resonance imaging (MRI). However, network pattern analyses have not been commonly used to study neurotransmitter changes using PET data. In addition, the emergence of multi-tracer imaging studies highlights the needs to develop novel joint analysis methods to extract and combine complementary information from each imaging dataset to obtain a complete picture of the complex brain states. This thesis constitutes one of the first applications of such methods in the PET field. Parkinson’s disease (PD) is the second most common neurodegenerative disorder. It has a long prodromal stage, and non-motor symptoms occur alongside or even before motor symptoms. Initially thought to affect predominantly the dopaminergic system, PD is now deemed to be associated with alterations in several other non-dopaminergic neurotransmitter systems. Such changes, specific to PD, are sometimes difficult to detect, especially in prodromal and early stages of the disease; the interactions between different disease-related mechanisms also remain largely unclear. In addition, the disease origin is unknown and there is currently no effective cure for PD. In this thesis work, we 1) explored deterministic spatial connectivity changes in the serotonergic system that are sensitive for detecting subtle changes in the prodromal and early disease stages; 2) introduced dynamic mode decomposition to extract spatio-temporal patterns of dopaminergic denervation for modelling disease progression; 3) introduced a novel joint pattern analysis approach to extract complementary information in the dopaminergic and serotonergic systems and their relationships with treatment response and treatment-induced complications. These novel methods not only lead to new understandings of PD, but also provide more sensitive and deterministic tools for the analysis of PET data in a variety of clinical applications.
Negative emotions boost users activity at BBC Forum
Creators: name: Chmiel, Anna
name: Sobkowicz, Pawel
name: Sienkiewicz, Julian
name: Paltoglou, Georgios
name: Buckley, Kevan
name: Thelwall, Mike
name: Holyst, Janusz A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We present an empirical study of user activity in online BBC discussion forums, measured by the number of posts written by individual debaters and the average sentiment of these posts. Nearly 2.5 million posts from over 18 thousand users were investigated. Scale free distributions were observed for activity in individual discussion threads as well as for overall activity. The number of unique users in a thread normalized by the thread length decays with thread length, suggesting that thread life is sustained by mutual discussions rather than by independent comments. Automatic sentiment analysis shows that most posts contain negative emotions and the most active users in individual threads express predominantly negative sentiments. It follows that the average emotion of longer threads is more negative and that threads can be sustained by negative comments. An agent based computer simulation model has been used to reproduce several essential characteristics of the analyzed system. The model stresses the role of discussions between users, especially emotionally laden quarrels between supporters of opposite opinions, and represents many observed statistics of the forum.
description: 29 pages, 6 figures
Intrinsic and extrinsic x-ray absorption effects in soft x-ray diffraction from the superstructure in magnetite
Creators: name: Chang, C. F.
name: Schlappa, J.
name: Buchholz, M.
name: Tanaka, A.
name: Schierle, E.
name: Schmitz, D.
name: Ott, H.
name: Sutarto, R.
name: Willers, T.
name: Metcalf, P.
name: Tjeng, L. H.
name: Schuessler-Langeheine, C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We studied the (001/2) diffraction peak in the low-temperature phase of magnetite (Fe3O4) using resonant soft x-ray diffraction (RSXD) at the Fe-L2,3 and O-K resonance. We studied both molecular-beam-epitaxy (MBE) grown thin films and in-situ cleaved single crystals. From the comparison we have been able to determine quantitatively the contribution of intrinsic absorption effects, thereby arriving at a consistent result for the (001/2) diffraction peak spectrum. Our data also allow for the identification of extrinsic effects, e.g. for a detailed modeling of the spectra in case a "dead" surface layer is present that is only absorbing photons but does not contribute to the scattering signal.
description: to appear in Phys. Rev. B
How Vulnerable is an Undirected Planar Graph with respect to Max Flow
Creators: name: Balzotti, Lorenzo
name: Franciosa, Paolo G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences
subject: F.2.2; G.2.2

description: We study the problem of computing the vitality of edges and vertices with respect to the $st$-max flow in undirected planar graphs, where the vitality of an edge/vertex is the $st$-max flow decrease when the edge/vertex is removed from the graph. This allows us to establish the vulnerability of the graph with respect to the $st$-max flow. We give efficient algorithms to compute an additive guaranteed approximation of the vitality of edges and vertices in planar undirected graphs. We show that in the general case high vitality values are well approximated in time close to the time currently required to compute $st$-max flow $O(n\log\log n)$. We also give improved, and sometimes optimal, results in the case of integer capacities. All our algorithms work in $O(n)$ space.
description: 20 pages, 13 figures
DEAL Open-Access-Option optimal nutzen – ein Bibliothekspraxisbericht
Creators: name: Voigt, Michaela
Publisher: name: Humboldt-Universität zu Berlin
Year: 2020
Subjects: subject: library
subject: Germany
subject: open access
subject: project DEAL
subject: open access transformation
subject: Creative Commons
subject: Wiley
subject: SpringerNature
subject: Open Access
subject: Deutschland
subject: DEAL
subject: Open-Access-Transformation
subject: Bibliothek
subject: 020 Bibliotheks- und Informationswissenschaften

description: Mit den DEAL-Verträgen steht das Versprechen im Raum, administrative und (autor*innenseitig) finanzielle Hürden für Open Access zu reduzieren. Für Bibliotheken bedeuten die DEAL-Verträge neben der Zentralisierung von Finanzströmen häufig auch mehr Verantwortung in anderen Bereichen: Information über die Verträge allgemein und Rechte von Autor*innen, Verifikation berechtigter Artikel, direkte Beratung bei Fragen rund um Workflows und Creative-Commons-Lizenzen und vieles mehr. Der Beitrag ist eine Ausarbeitung des Vortrags beim 1. DEAL Praxis-Webinar (Voigt 2020) und gibt einen Überblick, in welchen Handlungsfeldern die Universitätsbibliothek der Technischen Universität (TU) Berlin aktiv wird. Ein besonderer Fokus liegt dabei auf der Kommunikation mit den Wissenschaftler*innen, um den größtmöglichen Anteil an Open Access und Offenheit aus den DEAL-Verträgen herauszuholen.
Interplay of couplings between antiferrodistortive, ferroelectric, and strain degrees of freedom in monodomain PbTiO$_{3}$/SrTiO$_{3}$ superlattices
Creators: name: Aguado-Puente, Pablo
name: García-Fernández, Pablo
name: Junquera, Javier
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report first-principles calculations on the coupling between epitaxial strain, polarization, and oxygen octahedra rotations in monodomain (PbTiO$_{3}$)$_{n}$/(SrTiO$_{3}$)$_{n}$ superlattices. We show how the interplay between (i) the epitaxial strain and (ii) the electrostatic conditions, can be used to control the orientation of the main axis of the system. The electrostatic constrains at the interface facilitate the rotation of the polarization and, as a consequence, we predict large piezoelectric responses at epitaxial strains smaller than those that would be required considering only strain effects. In addition, ferroelectric (FE) and antiferrodistortive (AFD) modes are strongly coupled. Usual steric arguments cannot explain this coupling and a covalent model is proposed to account for it. The energy gain due to the FE-AFD coupling decreases with the periodicity of the superlattice, becoming negligible for $n \ge 3$.
description: 5 pages, 4 figures
Semi-device-independent certification of indefinite causal order in a photonic quantum switch
Creators: name: Cao, Huan
name: Bavaresco, Jessica
name: Wang, Ning-Ning
name: Rozema, Lee A.
name: Zhang, Chao
name: Huang, Yun-Feng
name: Liu, Bi-Heng
name: Li, Chuan-Feng
name: Guo, Guang-Can
name: Walther, Philip
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report an experimental certification of indefinite causal order that relies only on the characterization of the operations of a single party. We do so in the semi-device-independent scenario with the fewest possible assumptions of characterization of the parties' local operations in which indefinite causal order can be demonstrated with the quantum switch. To achieve this result, we introduce the concept of semi-device-independent causal inequalities and show that the correlations generated in a photonic quantum switch, in which all parties are able to collect local outcome statistics, achieve a violation of this inequality of 224 standard deviations. This result consists of the experimental demonstration of indefinite causal order with the fewest device-characterization assumptions to date.
description: 9 + 4 pages, 5 + 1 figures. Close to the published version
Maestra, con i fogli stiamo sprecando gli alberi
Creators: name: Lucchini, Sara
Publisher: name: Scuola Universitaria della Svizzera Italiana (SUPSI)
Year: 2017

description: Nella ricerca sono state studiate le concezioni di bambini di Scuola dell'Infanzia sull’utilizzo sostenibile del materiale carta, verificando se possedessero già, e come costruissero, competenze di Educazione allo Sviluppo Sostenibile (ESS). L'evoluzione di esse è stata sostenuta con un itinerario didattico i cui interventi hanno sondato le idee dei bambini sui tipi di carta, diversi metodi di riciclo/riutilizzo, fino a discutere regole di utilizzo che limitino lo spreco e la produzione a partire dal legno. I dati sono stati raccolti tramite osservazione e registrazione, analizzati mediante il software di analisi statistica dei testi IRaMuteQ e anche confrontati con quelli di una II elementare (collaborazione con M. Bruschetti). I risultati hanno mostrato che i bambini di SI sono legati agli aspetti concreti della carta, come dimostra la sensibilità percettiva nell'esplorazione e la non piena distinzione fra riutilizzo e riciclo. La riflessione sullo spreco porta i bambini a definire regole per il buon utilizzo della carta, per affetto e sensibilità verso la natura. Inoltre l’uso di una storia per narrare il processo produttivo della carta si è rivelato meno efficace. Esprimendo competenze di ESS legate a valori e volontà di intervento, i bambini hanno dunque un pensiero sostenibile, ma devono ancora stabilizzare i saperi. Il confronto con la classe elementare ha mostrato similitudini rilevanti ma che differivano per lessico e astrazione.
Ausstellung über die Möbel und Innenräume von Heinrich Tessenow in Pößneck
Creators: name: Schneider, Elia
Publisher: name: Scuola Universitaria della Svizzera Italiana (SUPSI)
Year: 2018

description: Die Rekonstruktion von Innen- und Epochenräumen in Ausstellungen haben in der Geschichte des Museums und der Architektur eine lange Tradition. So können zum Beispiel in Barcelona das von Gaudì gebaute Haus Milà, in Stuttgart die Weissenhofsiedlung oder in Weimar das Haus am Horn als Versuchshaus des Bauhauses als touristische Attraktion besichtigt werden. Heinrich Tessenow hat einen grundlegenden Beitrag zur Wohnkultur geleistet und neben urbanistischen und architektonischen Meisterleistungen auch qualitativ hochwertige Innenräume konzipiert. Die in Pößneck erhaltenen Innenraum-Fassungen stellen einen neuartigen und den bisher einzigen bekannten Befund dieser Art dar. Im Rahmen des Jahres der Moderne 2019 erhält die Stadt Pößneck die Chance, erstmals ein Tessenow-Interieur in einem Tessenow-Bau der Öffentlichkeit zugänglich zu machen. Die Ausstellung könnte einen wichtigen Beitrag dafür leisten, die Bevölkerung von Pößneck für die wertvollen Bauten von Tessenow zu sensibilisieren und ein attraktives Angebot für Besucherinnen und Besucher der Stadt zu schaffen. Die Bachelorarbeit sieht die Recherche und Planung der Rekonstruktion eines möblierten Heinrich Tessenow- Interieurs in Pößneck vor. Es stellt einen komplementären Beitrag zu der Rekonstruktion der Farbgebung der am besten erhaltenen Wohnung an der Neustädter Strasse 101 dar. Ziel ist es, eine temporäre, museale Zurschaustellung einzurichten, als Teil der Ausstellung über Heinrich Tessenow im Museum der Pößnecker Stadtgeschichte, vorgesehen für das Jahr der Moderne 2019.
Universal fractal scaling of self-organized networks
Creators: name: Laurienti, Paul J.
name: Joyce, Karen E.
name: Telesford, Qawi K.
name: Burdette, Jonathan H.
name: Hayasaka, Satoru
Publisher: name: arXiv
Year: 2010
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: There is an abundance of literature on complex networks describing a variety of relationships among units in social, biological, and technological systems. Such networks, consisting of interconnected nodes, are often self-organized, naturally emerging without any overarching designs on topological structure yet enabling efficient interactions among nodes. Here we show that the number of nodes and the density of connections in such self-organized networks exhibit a power law relationship. We examined the size and connection density of 47 self-organizing networks of various biological, social, and technological origins, and found that the size-density relationship follows a fractal relationship spanning over 6 orders of magnitude. This finding indicates that there is an optimal connection density in self-organized networks following fractal scaling regardless of their sizes.
title: Best Before? Expiring Central Bank Digital Currency and Loss Recovery
Creators: name: Zhu, Yu
name: Kahn, Charles M.
name: van Oordt, Maarten
Publisher: name: Bank of Canada
Year: 2021

description: "An important feature of physical cash payments is their resilience—they do not require electrical power or network coverage. Many central banks are exploring issuing digital cash products with similar offline payment functionality.

An inconvenient aspect of physical cash is that it can be lost, and there is no way to recover it. We consider a potential feature to solve this problem for offline digital cash: an expiry date to automate personal loss recovery. With this feature enabled, digital cash could not be spent after its expiry date. Consumers whose digital cash expired would automatically receive the funds back into their online account without having to file a claim.

We show that offering the option of personal loss recovery could substantially increase consumer demand for digital cash. However, the length of time to  expiry plays a key role. An expiry date that is too soon is inconvenient, but a date too far in the future slows down the reimbursement of lost digital cash."

description: "La résilience est une caractéristique importante des paiements au comptant. En effet, ces derniers ne requièrent pas d’électricité ou de couverture réseau. Un grand nombre de banques centrales étudient la possibilité d’émettre des monnaies numériques qui auraient ce type de fonctionnalité hors ligne.

Un désavantage de l’argent comptant est qu’on peut le perdre définitivement. Nous examinons l’ajout d’une fonctionnalité qui résoudrait ce problème dans le cas des monnaies numériques : une date d’expiration permettant de recouvrer automatiquement les sommes inutilisées. Avec cette fonctionnalité, un consommateur ne pourrait pas dépenser son argent numérique après une date d’expiration; il recevrait automatiquement dans son compte en ligne tout montant inutilisé, sans avoir à en faire la demande.

Nous montrons que l’ajout d’une telle fonctionnalité ferait considérablement augmenter la demande de monnaies numériques. Cependant, la durée de validité de l’argent numérique joue ici un rôle clé : une date d’expiration trop rapprochée n’est pas pratique, alors qu’une date trop éloignée dans le temps augmente le délai de remboursement des sommes inutilisées."
Existence of Rank Two Vector Bundles on Higher Dimensional Toric Varieties
Creators: name: Cotignoli, Giulio
name: Sterian, Alexandru
Publisher: name: arXiv
Year: 2010
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14M25, 14J60

description: In the mid 70's, Hartshorne conjectured that, for all n > 7, any rank 2 vector bundles on P^n is a direct sum of line bundles. This conjecture remains still open. In this paper, we construct indecomposable rank two vector bundles on a large class of Fano toric varieties. Unfortunately, this class does not contain P^n
description: 8 pages
Scientific Publishing: 2. Peer Review
Creators: name: Antonoyiannakis, Manolis
Publisher: name: Zenodo
Year: 2022
Subjects: peer review
editors
referees
highlighting papers
scientific publishing

description: This is the second of a five-lecture Seminar on Scientific Publishing, presented by Manolis Antonoyiannakis at Columbia University (sponsored by IGERT Quantum Optics) in 2016-2017. The seminar aims to train and inform graduate students and junior researchers on matters pertaining to scientific publishing. Its five themes are: (1) writing a paper, (2) peer review, (3) citation analysis & performance metrics, (4) publication ethics, and (5) topics from the history & sociology of science publishing. Lecture 2: Peer Review Review process in a nutshell Presubmission inquiry Internal Review (by journal editors and/or editorial board) Rejection Without External Review Editors: Role & Challenges External review (by anonymous referees): What it is, how long it takes, what is fair to expect from editors and reviewers Suggested/undesirable referees How do editors find referees for a paper? The 3R’s: “Revise, respond, and resubmit” Dos and don’ts when arguing with editors/referees Appealing a rejection to the Editorial Board/Editor-in-Chief Deciding when to cut one’s losses and submit elsewhere Highlighting papers New models of peer review: open, double-blind, and post-publication peer review
title: What Drives Bitcoin Fees? Using Segwit to Assess Bitcoin's Long-Run Sustainability
Creators: name: Brown, Coline
name: Chiu, Jonathan
name: Koeppl, Thorsten
Publisher: name: Bank of Canada
Year: 2022

description: "Bitcoin is a decentralized payment system: a central institution to verify and settle transactions does not exist. What drives the transaction fees in this system? Can it remain tamper proof in the long run?

We develop an empirical model to study how the demand for bitcoin influences transaction fees. To identify supply and demand effects, we analyze two types of events—two rapid price increases since late 2017 and the introduction of a new feature called Segwit.

We find that Segwit reduced fee revenue by about 70%. Fee revenue is maximized at a block size of about 0.6 megabytes when Segwit adoption remains at current levels. In addition, large sustained price increases are required to keep mining rewards constant in the long run."

description: "Le Bitcoin est un système de paiement décentralisé : il n’existe aucune institution centrale pour vérifier et régler les transactions. Quels facteurs influent sur les frais de transaction dans ce système? Le Bitcoin peut-il rester inviolable à long terme?  

Nous élaborons un modèle empirique pour étudier comment la demande de bitcoins influe sur les frais de transaction. Pour déterminer les effets de l’offre et de la demande, nous analysons deux types d’événements : deux hausses rapides du prix du bitcoin depuis 2017 et l’ajout d’une nouvelle fonction appelée « témoin séparé ».

Nous constatons que l’utilisation du témoin séparé a réduit les revenus issus des frais de transaction d’environ 70 %. Ces revenus atteignent un maximum à une longueur de bloc d’environ 0,6 mégaoctet lorsque l’adoption du témoin séparé reste aux niveaux actuels. De plus, des augmentations importantes et durables du prix du bitcoin sont nécessaires pour maintenir les primes de minage constantes à long terme."
Scientific Publishing: 3. Citation Analysis & Performance Metrics
Creators: name: Antonoyiannakis, Manolis
Publisher: name: Zenodo
Year: 2022
Subjects: citation analysis
Impact Factor
Eigenfactor
h5 index
Medial Citation Index
citation distributions
Altmetrics
highlighting papers
bibliostatistics
scientific publishing

description: This is the third of a five-lecture Seminar on Scientific Publishing, presented by Manolis Antonoyiannakis at Columbia University (sponsored by IGERT Quantum Optics) in 2016-2017. The seminar aims to train and inform graduate students and junior researchers on matters pertaining to scientific publishing. Its five themes are: (1) writing a paper, (2) peer review, (3) citation analysis & performance metrics, (4) publication ethics, and (5) topics from the history & sociology of science publishing. Lecture 3: Citation analysis & performance metrics Basic metrics: Journal Impact Factor, Median Citation Index, Eigenfactor, h-index, h5 index, Immediacy Index, etc. Repeat after me: “Large journals cannot have high Impact Factors” Citation distributions: basic facts & properties Citation performance: groups (journals, universities, etc.) vs. individuals The High-Impact-Factor Syndrome and the “scourge of bibliometrics” Citation databases Altmetrics Metrics of highlighted papers (Editors’ Choice, etc.) Sleeping beauties: What are they? How rarely do they occur?
Scientific Publishing: 4. Publication Ethics
Creators: name: Antonoyiannakis, Manolis
Publisher: name: Zenodo
Year: 2022
Subjects: scientific publishing
peer review
publication ethics
reproducibility
plagiarism
retractions
comments
errata

description: This is the fourth of a five-lecture Seminar on Scientific Publishing, presented by Manolis Antonoyiannakis at Columbia University (sponsored by IGERT Quantum Optics) in 2016-2017. The seminar aims to train and inform graduate students and junior researchers on matters pertaining to scientific publishing. Its five themes are: (1) writing a paper, (2) peer review, (3) citation analysis & performance metrics, (4) publication ethics, and (5) topics from the history & sociology of science publishing. Seminar 4: Publication Ethics Authorship References Priority claims Reproducibility Fabricating data Plagiarism and self-plagiarism Retractions, Comments, and Errata Expanded versions of Letters Being scooped: what to do to avoid it, and how to survive it
A Method to Estimate the Boson Mass and to Optimise Sensitivity to Helicity Correlations of tau+tau- Final States
Creators: name: Rosendahl, Peter L.
name: Burgess, Thomas
name: Stugu, Bjarne
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In proton-proton collisions at LHC energies, Z and low mass Higgs bosons would be produced with high and predominantly longitudinal boost with respect to the beam axis. This note describes a new analysis tool devised to handle this situation in cases when such bosons decay to a pair of tau-leptons. The tool reconstructs the rest frame of the tau+tau- pair by finding the boost that minimises the acollinearity between the visible tau decay products. In most cases this gives a reasonable approximation to the rest frame of the decaying boson. It is shown how the reconstructed rest frame allows for a new method of mass estimation. Also a considerable gain in sensitivity to helicity correlations is obtained by analysing the tau-jets in the reconstructed frame instead of using the laboratory momenta and energies, particularly when both tau-leptons decay hadronically.
description: 13 pages, method extended with 3D boost finder
Russian-speaking immigrants in Canada : belonging, political subjectivity, and struggle for recognition
Creators: name: Rogova, Anastasia
Publisher: name: University of British Columbia
Year: 2020

description: This dissertation explores various aspects of how Russian-speaking immigrants in Toronto negotiate their sense of belonging, social identities, forms of political participation, and citizenship. The particular topics that I address include: the dominant forms of historical imagination in the community and its preoccupation with contested historical topics, especially in regards to World War II; immigrants’ disagreement with liberal gender politics and sex education programs at public schools, which I interpret as a manifestation of their insecurity about their children’s identities and their parental rights; ideas about education among Russian-speaking immigrants, which reveal their concerns about social class and privilege and their striving to ascertain a sense of belonging to a higher social status in their new country; and, finally, the aspirations for inclusion and full participation in Canadian society that drive their political and cultural activism. I examine how class aspirations based on a high level of education conflate with cultural and moral values of the Russian-speaking community and form the basis for their political mobilization and struggle for their right to be included in the society as a group with their own distinct cultural and historical narratives. I study political participation of Russian-speaking immigrants as a diasporic group in Canada and show how their citizenship practices are simultaneously informed by their Soviet and post-Soviet experiences and by the Canadian political discourse, including the politics of multiculturalism. My research contributes to the understanding of Russian-speaking immigrants in Canada and their experiences of participation in Canadian society. My dissertation also addresses how Canadian multiculturalism policies impact various groups of Canadians who struggle for their right to be included in the society as a group with their own distinct cultural and historical narratives. Exploring the Russian-speaking immigrant community in Canada, I analyze how their allegiance to their new country and the ways in which they embrace its citizenship practices co-exist with a sense of belonging and allegiance to their homeland. Overall, my study of Russian-speaking immigrants contributes to understanding how diasporas negotiate their multiple ways of belonging in a world where multiple political allegiances are often seen as threatening and questionable.
More Three Dimensional Mirror Pairs
Creators: name: Nanopoulos, Dimitri
name: Xie, Dan
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We found a lot of new three dimensional N = 4 mirror pairs generalizing previous considerations on three dimensional generalized quiver gauge theories. We recovered almost all previous discovered mirror pairs with these constructions. One side of these mirror pairs are always the conventional quiver gauge theories. One of our result can also be used to determine the matter content and weakly coupled gauge groups of four dimensional N = 2 generalized quiver gauge theories derived from six dimensional A_N and D_N theory, therefore we explicitly constructed four dimensional S-duality pairs.
description: 33 pages, 18 figures version2 minor corrections
Palestra tripla con struttura in legno,Grandson (VD)
Creators: name: Balzaretti, Stefano
Publisher: name: Scuola Universitaria della Svizzera Italiana (SUPSI)
Year: 2016

description: Il tema in esame tratta di una palestra tripla e la sua realizzazione è prevista all’interno di un centro scolastico e sportivo, su una parcella piuttosto estesa, nr. 1387 – zona agricola. Le parcelle nr. 793 e 1727, delle quali il comune di Grandson è proprietario, sono classificate come zone di pubblica utilità e parzialmente costruite, ma non riescono a soddisfare le esigenze scolastiche e sportive di interesse intercomunale. Il progetto originale prevede una tribuna, un ampio scantinato e l’area di gioco, sui quali sorgerà la struttura in legno. Unica condizione vincolante del progetto riguarda la completa assenza di pilastri o altri elementi di intralcio all’interno dell’area di gioco.
Kolumne Bibliotheksphilokartie #1: Die McLaughlin Public Library in Oshawa
Creators: name: Kaden, Ben
Publisher: name: Humboldt-Universität zu Berlin
Year: 2020
Subjects: subject: library
subject: postcard
subject: deltiology
subject: Bibliothek
subject: Postkarte
subject: Philokartie
subject: 020 Bibliotheks- und Informationswissenschaften

description: In einer neuen Kolumne wird Ben Kaden regelmäßig eine Ansichtskarte mit Bibliotheksbezug aus seiner Sammlung kurz vorstellen.
Algebrizzati! Come coltivare il pensiero algebrico in prima media
Creators: name: Vaccarino, Vanessa
Publisher: name: Scuola Universitaria della Svizzera Italiana (SUPSI)
Year: 2024
Subjects: early algebra
simbolo e significato di uguale
generalizzazione
argomentazione
problem solving

description: Lo studio ha indagato l'impatto che un percorso didattico incentrato sull’early algebra ha avuto sullo sviluppo del pensiero algebrico in studenti di prima media. Attraverso una ricerca-azione condotta presso una classe di prima del Canton Ticino, sono state esaminate in entrata le concezioni degli allievi rispetto al simbolo e al concetto di uguaglianza, così come le loro competenze nella generalizzazione e nell’argomentazione in ambito aritmo-geometrico. Sono state poi progettate e proposte attività ispirate al progetto ArAl per sviluppare e valutare l’evoluzione delle competenze degli allievi. I dati raccolti (risposte a questionari, protocolli risolutivi degli allievi, diario di bordo) sono stati analizzati sia qualitativamente che quantitativamente definendo degli opportuni indicatori. I risultati hanno evidenziato un progressivo e significativo miglioramento nelle competenze degli allievi, soprattutto nell'argomentazione e nella generalizzazione. Si sono altresì rilevate persistenti difficoltà nell’utilizzare autonomamente il linguaggio simbolico e nel concepire il simbolo di uguaglianza in modo relazionale. Questa ricerca contribuisce alla comprensione delle difficoltà che gli allievi hanno nell’affrontare il passaggio dall’aritmetica all’algebra e suggerisce piste di sviluppo nel campo della didattica della matematica. Relatrice: Rossana Falcade Pincolini.
New Physics in b -> s mu+ mu-: CP-Conserving Observables
Creators: name: Alok, Ashutosh Kumar
name: Datta, Alakabha
name: Dighe, Amol
name: Duraisamy, Murugeswaran
name: Ghosh, Diptimoy
name: London, David
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We perform a comprehensive study of the impact of new-physics operators with different Lorentz structures on decays involving the b -> s mu+ mu- transition. We examine the effects of new vector-axial vector (VA), scalar-pseudoscalar (SP) and tensor (T) interactions on the differential branching ratios and forward-backward asymmetries (A_{FB}'s) of Bsbar -> mu+ mu-, Bdbar -> Xs mu+ mu-, Bsbar -> mu+ mu- gamma, Bdbar -> Kbar mu+ mu-, and Bdbar -> K* mu+ mu-, taking the new-physics couplings to be real. In Bdbar -> K* mu+ mu-, we further explore the polarization fraction f_L, the angular asymmetry A_T^{(2)}, and the longitudinal-transverse asymmetry A_{LT}. We identify the Lorentz structures that would significantly impact these observables, providing analytical arguments in terms of the contributions from the individual operators and their interference terms. In particular, we show that while the new VA operators can significantly enhance most of the asymmetries beyond the Standard Model predictions, the SP and T operators can do this only for A_{FB} in Bdbar -> Kbar mu+ mu-.
description: 54 pages, JHEP format, 45 figures (included). 5/6/2013: typos in K* mu mu angular coefficients corrected, typos in Eq. (D.12) corrected, added a missing term in I3LT in Eq. (D.16). Numerical analysis unchanged
Wie steht es mit Open Access in den „Buchfächern“? Erfahrungen aus dem Projekt OGeSoMo
Creators: name: Fadeeva, Yuliya
Publisher: name: Humboldt-Universität zu Berlin
Year: 2020
Subjects: subject: library
subject: open access
subject: open access books
subject: Humanities
subject: FOS: Humanities
subject: Social Sciences
subject: project report
subject: Bibliothek
subject: Open Access
subject: OGeSoMo
subject: Open-Access-Bücher
subject: Geisteswissenschaften
subject: Sozialwissenschaften
subject: Projektbericht
subject: 020 Bibliotheks- und Informationswissenschaften

description: Das BMBF-geförderte Projekt Open Access in den Geistes- und Sozialwissenschaften mit dem Schwerpunkt Monografien (OGeSoMo), angesiedelt an der Universitätsbibliothek (UB) und dem germanistischen Institut der Universität Duisburg-Essen (UDE), unterstützte 2018-2020 die Entwicklung von Open Access (OA) in den sogenannten Buchdisziplinen an der Universitätsallianz Ruhr (UAR). Dank einer Anschubfinanzierung von 75.000 € und beinahe ebenso hoher Eigenbeteiligung der UDE wurde eine große Anzahl von Monografien und Sammelbänden in Open Access überführt bzw. als OA erstpubliziert. Im Folgenden werden einige Eckpunkte und Ergebnisse des Projekts vorgestellt.
title: Firm Inattention and the Efficacy of Monetary Policy: A Text-Based Approach
Creators: name: Song, Wenting
name: Stern, Samuel
Publisher: name: Bank of Canada
Year: 2022

description: "When making production and pricing decisions, firm managers may not have the resources to track, interpret and respond to macroeconomic news. Despite the potential importance of such attention for firm performance, empirically assessing this importance has been challenging. This is because attention is neither easily observable nor quantifiable.

We construct a novel measure of firm attention to macroeconomic news based on their public annual filings with the US Securities and Exchange Commission. We then use this measure to determine the size of information costs in a model with rationally inattentive firms. We show that output response of inattentive firms is more sensitive to monetary policy than that of attentive firms.

The paper provides some of the first direct evidence of the importance of firm attention to the macroeconomy. We document that more firms pay attention to macroeconomic news during recessions even though most firms appear to always or never pay attention. When they do pay attention to a central bank’s moves during recessions, monetary stimulus has a smaller effect on output."

description: "Au moment de prendre des décisions sur la production et l’établissement des prix, les responsables d’entreprises ne disposent peut-être pas des ressources nécessaires pour suivre et interpréter les nouvelles macroéconomiques et y réagir. Malgré l’importance potentielle pour une entreprise de prêter attention à de telles nouvelles, du point de vue de ses résultats financiers, l’évaluation empirique de cette importance pose un défi. La raison : l’attention est une variable difficile à observer et à quantifier.

Nous élaborons un nouvel indicateur de l’attention portée par les entreprises aux informations macroéconomiques en nous basant sur les relevés annuels que les sociétés ouvertes soumettent à la US Securities and Exchange Commission. Nous nous servons ensuite de cet indicateur pour déterminer l’ampleur des coûts de l’information dans un modèle intégrant des entreprises rationnellement inattentives. Nous montrons que la production des entreprises inattentives réagit davantage à la politique monétaire que celle des entreprises attentives.

Cette étude fournit certains des premiers éléments probants sur l’importance de l’attention accordée par les entreprises aux informations macroéconomiques. Même si la plupart des entreprises semblent soit toujours prêter attention aux nouvelles macroéconomiques, soit ne jamais le faire, nous constatons qu’elles sont plus nombreuses à s’y intéresser en période de récession. Quand elles s’intéressent aux interventions de la banque centrale pendant une récession, la détente monétaire a une plus faible incidence sur leur production."
On quotients of bounded homogeneous domains by unipotent discrete groups
Creators: name: Miebach, Christian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 32M10, 32E10

description: We show that the quotient of any bounded homogeneous domain by a unipotent discrete group of automorphisms is holomorphically separable. Then we give a necessary condition for the quotient to be Stein and prove that in some cases this condition is also sufficient.
description: 17 pages; minor mistakes corrected; references added; to appear in the Annali della Scuola Normale Superiore di Pisa, Classe di Scienze
Diode for Bose-Einstein condensates
Creators: name: Larson, Jonas
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Given a quantum state at some instant of time t, the underlying system Hamiltonian can not only predict how the state will evolve, but also the history of the state prior to t. Thereby, in order to have a directed motion, like in a diode, some sort of irreversibility must be considered. For the atom diode, this has been achieved by spontaneous decay of excited atomic levels. For an atomic condensate, it is clear, however, that such decay will cause both heating and decoherence of the condensate. To overcome this complication we introduce a different setup where the dissipation does not act directly on the atoms. The excited atoms are stimulatedly driven back to the ground state by exciting a cavity mode, which in return decays to the vacuum via photon losses. The efficiency of the method utilizing experimental parameters is shown to be almost perfect within large parameter regimes.
description: 5 pages, 3 figures
Coherence limitations in the optical control of the singlet-triplet qubit in a quantum dot molecule
Creators: name: Kawa, Karol
name: Kuhn, Tilmann
name: Machnikowski, Paweł
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the optically driven dynamics of a qubit implemented on a singlet-triplet subspace of two-electron states in a self-assembled quantum dot molecule. We study two possible control schemes based on the coupling to an excited (four-particle) state either by two spectrally separated laser pulses or by a single spectrally broad pulse. We quantitatively characterize the imperfections of the qubit operation resulting from non-adiabatic evolution and from limited spectral selectivity in a real system, as compared to the ideal adiabatic Raman transfer of occupation in the $Λ$-system. Next, we study the effects of decoherence induced by the coupling to the phonons of the surrounding crystal lattice and by radiative recombination. As a result, we are able to identify the optimization trade-offs between different sources of errors and indicate the most favorable conditions for quantum control of the singlet-triplet qubit in the two optical control schemes.
EFFECTS OF COVID-19 PANDEMIC ON FOOD SECURITY AND HOUSEHOLD LIVELIHOODS IN KENYA
Creators: name: OUKO, Kevin Okoth
name: GWADA, Robert Ouko
name: ALWORAH, Getrude Okutoyi
name: ONGANGA, Zephaniah Mayaka
name: OCHIENG, Sharon Vera
name: OGOLA, John Robert Ouko
name: OUKO, Kevin Okoth
name: GWADA, Robert Ouko
name: ALWORAH, Getrude Okutoyi
name: ONGANGA, Zephaniah Mayaka
name: OCHIENG, Sharon Vera
name: OGOLA, John Robert Ouko
Publisher: name: Unknown
Year: 2020
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Consumer/Household Economics
subject: Crop Production/Industries
subject: Food Consumption/Nutrition/Food Safety
subject: Food Security and Poverty
subject: Health Economics and Policy
subject: Institutional and Behavioral Economics
subject: Production Economics
subject: COVID-19
subject: food security
subject: household livelihoods
subject: epidemics
subject: pandemics

description: This paper aims to contribute to the understanding of the resultant effects of the new Coronavirus which is known to cause a Severe Acute Respiratory Syndrome in humans (SARS-CoV-2 better known as COVID-19) on food security and household livelihoods in Kenya. This is achieved by providing a comprehensive literature review on past global epidemics, pandemics and natural hazards and disasters; and their effects on food security and household livelihoods. The study reviews articles and reports that have widely discussed the effects of other epidemics that have occurred in contemporary times on food security and household livelihoods. The selection of the materials used in the study was based on authenticity and relevance. The observed impacts of the coronavirus pandemic and previous epidemics, pandemics and natural hazards and disasters call for policy measures to curb future occurrences. Countries' preparedness for pandemics is crucial to prevent adverse economic effects and loss of human lives. There is also a need to put in necessary measures to ensure the sustainability of resources, strengthen infrastructure and food systems to avoid or minimize food crises in the future.
description: doi: 10.15414/raae.2020.23.02.72-80; https://roaae.org/issue/review-of-agricultural-and-applied-economics-raae-vol-23-no-2-2020-2/?article=effects-of-covid-19-pandemic-on-food-security-and-household-livelihoods-in-kenya
From geomagnetic observations at COI to GICs in the Portuguese power system network
Creators: name: Pinheiro, Fernando
name: Ribeiro, Joana
name: M. Alexandra Pais
name: Ribeiro, Paulo
name: Morozova, Anna
name: Santos, Fernando M.
name: Fernandes, João
name: Francisco, Cristiana
Publisher: name: Zenodo
Year: 2020

description: Geomagnetic storms induce electric fields on the ground, which are the source of Geomagnetically Induced Currents (GICs) in grounded conductors such as transmission power systems. Despite being a phenomenon more often associated with countries located at high latitudes, they are not exclusive to them. Indeed, there are accounts of GICs in low latitude countries such as China, South Africa, Brazil or Spain. In this work we will provide a quick overview of Space Weather and Geomagnetism, indicating the sources of variability of Earth’s magnetic field. Moreover, we will show how to compute the electric fields generated by geomagnetic storms and the GICs that are induced in transmission power grids. We use as an illustrative example the case of the southern Portuguese power network. Our study is made within the framework of MAG-GIC project, which aims to characterize GICs in the whole Portuguese transmission power system network. The calculations are based on observations from the magnetic observatory of Coimbra, for which a short description is given.
Formal similarity between mathematical structures of electrodynamics and quantum mechanics
Creators: name: Deriglazov, A. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Electromagnetic phenomena can be described by Maxwell equations written for the vectors of electric and magnetic field. Equivalently, electrodynamics can be reformulated in terms of an electromagnetic vector potential. We demonstrate that the Schrödinger equation admits an analogous treatment. We present a Lagrangian theory of a real scalar field $ϕ$ whose equation of motion turns out to be equivalent to the Schrödinger equation with time independent potential. After introduction the field into the formalism, its mathematical structure becomes analogous to those of electrodynamics. The field $ϕ$ is in the same relation to the real and imaginary part of a wave function as the vector potential is in respect to electric and magnetic fields. Preservation of quantum-mechanics probability is just an energy conservation law of the field $ϕ$.
description: 12 pages
title: Before and After Kalīla wa-Dimna
title: An Introduction to the Special Issue on Animals, Adab, and Fictivity
titleType: Subtitle
Creators: name: Keegan, Matthew L.
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: animals
subject: adab
subject: Kalila and Dimna
subject: Fabel
subject: Tierfabel
subject: AnonymClassic publication
classificationCode: 892
subject: Afro-Asiatic literatures Semitic

description: The Abbasid-era textual tradition is full of animals. The variety and range of narratives about animals are brought together here in this special issue. Although Kalīla wa-Dimna is certainly the most famous work to feature talking animals and fictive humans, it is by no means the only one. This special issue of the Journal of Abbasid Studies looks beyond Kalīla wa-Dimna by bringing together articles engaging with this broader tradition of putting animals to work in Arabic texts and, quite often, giving them the ability to talk. These papers are the first fruits of a 2019 workshop at the Freie Universität Berlin entitled Animals, Adab, and Fictivity, organized by Beatrice Gruendler and myself under the auspices of Beatrice Gruendler's ERC project entitled AnonymClassic.
Hasse principles for quadratic forms over function fields
Creators: name: Cassady, Connor
Publisher: name: arXiv
Year: 2022
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 11E04, 11E20, 14G12 (primary), 12G05, 12J10, 13J10 (secondary)

description: We investigate the Hasse principles for isotropy and isometry of quadratic forms over finitely generated field extensions with respect to various sets of discrete valuations. Over purely transcendental field extensions of fields that satisfy property $\mathscr{A}_i(2)$ for some $i$, we find numerous counterexamples to the Hasse principle for isotropy with respect to a relatively small set of discrete valuations. For finitely generated field extensions $K$ of transcendence degree $r$ over an algebraically closed field of characteristic $\ne 2$, we use the $2^r$-dimensional counterexample to the Hasse principle for isotropy due to Auel and Suresh to obtain counterexamples of lower dimensions with respect to the divisorial discrete valuations induced by a variety with function field $K$.
description: 15 pages. Section 2 has been shortened. The hypotheses of Proposition 3.1 have been weakened, and the former Proposition 3.4 has been removed