cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Development of a relativistic coupled-cluster method for one electron detachment theory: Application to Mn IX, Fe X, Co XI and Ni XII ions
Creators: name: Nandy, D. K.
name: Sahoo, B. K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We have developed one electron detachment theory from a closed-shell atomic configuration in the relativistic Fock-space coupled-cluster ansatz. Using this method, we determine sensitivity coefficients to the variation of the fine structure constant in the first three important low-lying transitions of the astrophysically interesting highly charged Mn IX, Fe X, Co XI and Ni XII ions. The potential of this method has been assessed by evaluating the detachment energies of the removed electrons and determining lifetimes of the atomic states in the above ions. To account the sensitivity of the higher order relativistic effects, we have used the four component wave functions of the Dirac-Coulomb-Breit Hamiltonian with the leading order quantum electrodynamics (QED) corrections. A systematic study has been carried out to highlight the importance of the Breit and QED interactions in the considered properties of the above ions.
Measurement of abnormal returns and its implication for the post-earnings announcement drift
Creators: name: Zhou, Yixun
Publisher: name: No Publisher Supplied
Year: 2022

description: This dissertation consists of three chapters and investigates the critical impact of selecting proper abnormal return measures for drawing inferences on one of the famous accounting anomalies – the post-earnings announcement drift (PEAD). In the process, other topics, such as earnings surprise metrics, measurement of stock return predictive power, and coefficient instability are also discussed. In the first chapter, I look at the PEAD from an event study perspective to see if the realization of unexpected earnings (event) actually changes the returns process. This approach leads to significantly different inferences for the PEAD from the usual buy-and-hold returns methodology. I demonstrate that there is a significant event-leading excess return exhibiting a systematic correlation with standardized unexpected earnings (SUE) measured as median analysts’ forecast error scaled by the stock price. The second chapter repeats the analysis using other earnings surprise measures. I find that the event-leading excess return, measured by the alpha of Carhart 4-factor model estimated in the pre-earnings announcement estimation period, is significant for all the different measures of earnings surprise (although sometimes the pattern looks relatively random especially when incorporating the price factors into the time series expected earnings model and using the standard deviation of the forecast errors as the deflator). In other words, there is a critical impact on the inferences regarding PEAD from using an event study perspective that is not specific to a particular earnings surprise measure.In the third chapter, I apply a three-period approach and stratify individual firms into deciles based on the predictive power of the Carhart 4-factor model, measured by the out-of-sample R-squared in an intermediate prediction period. Poor out-of-sample predictive power of an estimated model may indicate instability of the coefficients resulting in mismeasured abnormal returns and a spurious inference of anomalies such as the PEAD. I support this reasoning with empirical results that analysts’ forecast accuracy is associated with stock return predictive power, indicating it may also be linked to coefficient instability.
Influence of sample measuring cell on isothermal crystallization of liquid crystalline compound forming the smectic CA* phase
Creators: name: Deptuch, Aleksandra
name: Juszyńska-Gałązka, Ewa
name: Drzewicz, Anna
name: Piwowarczyk, Marcin
name: Urbańska, Magdalena
name: Tykarska, Marzena
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences

description: Crystallization of liquid crystalline (S)-4′-(1-methylheptyloxycarbonyl) biphenyl-4-yl 4-[7-(2,2,3,3,4,4,4-heptafluorobutoxy) heptyl-1-oxy]-2,3-difluorobenzoate in isothermal conditions is investigated by polarizing optical microscopy and differential scanning calorimetry. It is shown that the sample container influences the crystallization kinetics, as a faster development of the crystal phase is observed on microscopic textures, for a sample in an electro-optic cell with a planarly aligning polymer layer, than for a sample in an aluminum pan used in a differential scanning calorimetry experiment. However, in both cases the total time of melt crystallization in the 291–303 K range is shorter than 10 min. Only at the highest investigated temperature, 305 K, the crystallization process is completed after 1.4 h because of a long initialization time. The difference with the glassforming (S)-4′-(1-methylheptyloxycarbonyl) biphenyl-4-yl 4-[7-(2,2,3,3,4,4,4-heptafluorobutoxy) heptyl-1-oxy]-2-fluorobenzoate is explained based on the thermodynamic driving force of crystallization.
Note on universal description of heavy and light mesons
Creators: name: Afonin, S. S.
name: Pusenkov, I. V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The experimental spectrum of excited S-wave vector mesons with hidden quark flavor reveals a remarkable property: For all flavors, it is approximately linear in mass squared, $m_n^2\approx a(n+b)$, $n$ is the radial quantum number. We draw attention to the fact that such a universal behavior for any quark mass cannot be obtained in a natural way within the usual semirelativistic potential and string-like models - if the Regge-like behavior is reproduced for the mesons made of the light quarks, the trajectories become essentially nonlinear for the heavy-quark sector. In reality, however, the linearity for the heavy mesons appears to be even better than for the light ones. In addition, the slope a is quite different for different quark flavors. This difference is difficult to understand within the QCD string approach since the slope measures the interaction strength among quarks. We propose a simple way for reparametrization of the vector spectrum in terms of quark masses and universal slope and intercept. Our model-independent analysis suggests that the quarks of any mass should be regarded as static sources inside mesons while the interaction between quarks is substantially relativistic.
description: Matches the version published in Mod. Phys. Lett. A
Minisymposium 01: Tätigkeitstheorie in der Mathematikdidaktik
Creators: name: Etzold, Heiko
name: Gebel, Inga
name: Bruder, Regina
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2023
Subjects: subject: Tätigkeitstheorie
subject: Activity Theory
subject: Vygotskij
subject: 510

description: Die Tätigkeitstheorie als moderat konstruktivistischer Ansatz von Lehr- Lern-Prozessen (Giest, 2016, S. 48) hat in der deutschsprachigen Mathematikdidaktik eine ambivalente Geschichte hinter sich. Während sie die Mathematikmethodik in der DDR stark prägte, wurde sie in ihrer ursprünglichen Ausprägung in der Fachdidaktik Mathematik der (früheren) BRD kaum sichtbar, gewinnt aber gerade in den letzten Jahren international (als activity theory) wieder stärkere Aufmerksamkeit. Mit der Orientierung an der Zone der nächsten Entwicklung, der schrittweisen Verinnerlichung von Handlungen oder der Gestaltung und Nutzung vermittelnder Werkzeuge werden auch heute noch häufig Elemente der Tätigkeitstheorie aufgegriffen, jedoch nicht immer explizit in ihr Theoriegefüge eingeordnet.
Minisymposium 10: Zugänge zur Rekonstruktion mathematischer Lernprozesse
Creators: name: Kollhoff, Sebastian
name: Salle, Alexander
name: Schütte, Marcus
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2023
Subjects: subject: Rekonstruktion
subject: Argumentation
subject: Erklärung
subject: 510

description: In der mathematikdidaktischen Forschung wird vielfach versucht, mathematikbezogene Lernwege in alltäglichen oder interventiven Lernsettings zu rekonstruieren. Ziel hierbei ist es, durch die Entwicklung mathematikdidaktischer Theorien optimierte Bedingungen zur Möglichkeit von Mathematiklernen zu beschreiben, um auf dieser Basis Handlungspotenziale für Lehrende auszuloten und Handlungsempfehlungen für die Praxis abzuleiten (Prediger, 2010).
Diffusive Molecular Communication with Disruptive Flows
Creators: name: Noel, Adam
name: Cheung, Karen C.
name: Schober, Robert
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, we study the performance of detectors in a diffusive molecular communication environment where steady uniform flow is present. We derive the expected number of information molecules to be observed in a passive spherical receiver, and determine the impact of flow on the assumption that the concentration of molecules throughout the receiver is uniform. Simulation results show the impact of advection on detector performance as a function of the flow's magnitude and direction. We highlight that there are disruptive flows, i.e., flows that are not in the direction of information transmission, that lead to an improvement in detector performance as long as the disruptive flow does not dominate diffusion and sufficient samples are taken.
description: 7 pages, 1 table, 5 figures. Will be presented at the 2014 IEEE International Conference on Communications (ICC) in Sydney, Australia, on September 12, 2013
Argumentieren im Hier und Jetzt – Zur situativen Normierung von kollektiven Argumentationen im Mathematikunterricht
Creators: name: Kollhoff, Sebastian
name: Tiedemann, Kerstin
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2023
Subjects: subject: Argumentieren
subject: Normierung
subject: Interaktion
subject: Rekonstruktion
subject: Argumentation
subject: Erklärung
subject: 510

description: Aus soziologischer Perspektive gilt es als weitgehend unstrittig, dass die beweisende Disziplin Mathematik mit einer starken Normierung ihrer Erkenntnis-, Darstellungs- und Kommunikationsprozesse einhergeht. Zweck ist dabei, die inhaltliche Kohärenz und den sozialen Konsens der Disziplin zu sichern (Heintz, 2000). Doch die fachlichen Konventionen, die in der Mathematik gelten, gelten nicht ohne Weiteres auch im alltäglichen Mathematikunterricht. Die Lernenden sind mit den wissenschaftlichen Konventionen nicht vertraut. Sie müssen mit Blick auf mathematische Argumentationen im konkreten Unterricht erst lernen, was eine mathematische Argumentation auszeichnet, welche Darstellungen dafür zulässig sind und was im Kollektiv der Lerngruppe als eine überzeugende / gelungene / angemessene Argumentation gilt (Voigt, 1994). Obgleich das Argumentieren aus mathematikdidaktischer Perspektive einhellig als eine zentrale prozessbezogene Kompetenz erachtet wird und zahlreiche aktuelle Forschungsarbeiten eindrücklich die damit verbundenen Schwierigkeiten aufseiten der Lernenden dokumentieren (Rach et al. 2021, Ufer 2021, Welsing 2020), wurde die Normierung von Argumentationen im Mathematikunterricht bisher kaum untersucht. Wie werden Anforderungen an mathematische Argumentationen im Unterricht etabliert? Wie lernen die Kinder das Argumentieren im Hier und Jetzt des Unterrichtsalltags? In einem Forschungsprojekt zur situativen Normierung von kollektiven Argumentationen im inklusiven Mathematikunterricht erforschen wir in unterschiedlichen Schulstufen vergleichend, wie Argumentationen in Plenumssituationen soziomathematisch normiert werden (Voigt, 1994) und inwiefern dabei Inklusionsbemühungen umgesetzt werden – oder auch nicht. In diesem Beitrag stehen die methodologische Perspektivierung und methodische Umsetzung des Projekts im Fokus.
Die Algebra auf den Kopf gestellt – Davydovs Ansatz für den Anfangsunterricht im Kontext Didaktik der Algebra
Creators: name: Reitz-Koncebovski, Karen
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2023
Subjects: subject: Mathematisches Denken
subject: Vorstellungsumbrüche
subject: Tätigkeitstheorie
subject: Activity Theory
subject: Vygotskij
subject: 510

description: Im Anfangsunterricht steht üblicherweise die Arithmetik im Mittelpunkt, der Zahlbegriffserwerb, Zählen, Mengen erfassen, Zahlen zerlegen, bündeln und das Verständnis für Stellenwerte, Addition und Subtraktion natürlicher Zahlen. Algebraisches kommt nur am Rande vor, zum Beispiel bei der Betrachtung arithmetischer oder geometrischer Muster. Ganz anders der Ansatz von Davydov (1986; Dawydow, 1977), der international in den letzten Jahren zunehmend Beachtung gefunden hat (vgl. Venenciano et al., 2021): Hier beginnt der Anfangsunterricht Mathematik nicht mit Zahlen, sondern mit Größen und Beziehungen zwischen Größen. Gegenstände aus der Lebenswelt werdend miteinander verglichen hinsichtlich Höhe, Umfang, Masse, Volumen oder Anzahl. Die entsprechenden Relationen werden ikonisch durch gleich oder unterschiedlich lange Strecken und symbolisch mit Variablen und Relationszeichen (z. B. A>B oder K=T) dargestellt. Die Kinder lernen Variable kennen, bevor sie Zahlen schreiben können. Zahlen werden als Verhältnisse von Größen zu Maßeinheiten eingeführt (z. B. gibt die Zahl 3 das Verhältnis des Volumens eines Gefäßes zum Volumen des kleineren Gefäßes, das zum Messen benutzt wird, an). Diese Definition passt nicht nur für natürliche, sondern auch für rationale Zahlen, die den Kindern somit von Anfang an zur Verfügung stehen. (Vgl. zu den angeführten Beispielen Davydov et al., 2019, S. 19, 30, 45). Dieses Vorgehen widerspricht der von den Bildungsstandards (Ständige Konferenz der Kultusminister der Länder in der Bundesrepublik Deutschland, 2005) nahegelegten Vorgehensweise, wie sie in Rahmenlehrplänen (z. B. für Berlin und Brandenburg, LISUM, 2015) umgesetzt wird. Welchen Sinn − außer allgemeiner Horizonterweiterung − kann es haben, dass sich Studierende des Primarstufenlehramts Mathematik mit Davydovs Ansatz beschäftigen?
Quantum curves for Hitchin fibrations and the Eynard-Orantin theory
Creators: name: Dumitrescu, Olivia
name: Mulase, Motohico
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Geometry (math.AG)
subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: Primary: 14H15, 14H60, 14H81, Secondary: 34E20, 81T45

description: We generalize the topological recursion of Eynard-Orantin (2007) to the family of spectral curves of Hitchin fibrations. A spectral curve in the topological recursion, which is defined to be a complex plane curve, is replaced with a generic curve in the cotangent bundle $T^*C$ of an arbitrary smooth base curve $C$. We then prove that these spectral curves are quantizable, using the new formalism. More precisely, we construct the canonical generators of the formal $\hbar$-deformation family of $D$-modules over an arbitrary projective algebraic curve $C$ of genus greater than $1$, from the geometry of a prescribed family of smooth Hitchin spectral curves associated with the $SL(2,\mathbb{C})$-character variety of the fundamental group $π_1(C)$. We show that the semi-classical limit through the WKB approximation of these $\hbar$-deformed $D$-modules recovers the initial family of Hitchin spectral curves.
description: 34 pages
Cilfái: Historical Geography on Kilvey Hill, Swansea
Creators: name: Robins, Nigel A
Publisher: name: Zenodo
Year: 2023
Subjects: Swansea, White Rock, Kilvey, Cilfái, Historical geography, Industrial Revolution, Wales, Kilvey Hill, Environment, Copper smelting, Pollution, Remediation

description: Author Nigel A. Robins Description  A collection of essays on the historical geography of Kilvey Hill in Swansea (Cilfái in Welsh). The Hill is an important part of the industrial history of copper smelting in Swansea. For over two hundred years, the Hill was polluted by the copper smoke from Swansea's famous White Rock Copper Works. This book looks at the impacts of pollution and the environmental recovery of the Hill since the pioneering restoration in the 1970s. Author Nigel A Robins is a Geographer and author specialising in the historical geography of South Wales. He was a heritage analyst for UK Government and the Palace of Westminster and now researches ancient woodland, landscape history, environmental history and the application of GIS methods and techniques for local history. Table of Contents Introduction, Kilvey, Coal and Kilvey, Copper and Kilvey, Pollution and Destruction, Repair, Nature and Restoration Categories and Keywords BISAC Main Category HISTORY / Historical Geography BISAC Category 2TECHNOLOGY & ENGINEERING / Environmental / General BISAC Category 3TECHNOLOGY & ENGINEERING / Environmental / Pollution Control Keywords Swansea, White Rock, Kilvey, Cilfái, Historical geography, Industrial Revolution, Wales, Kilvey Hill, Environment, Copper smelting, Pollution, Remediation
Pahangone mirabilis Tanasevitch 2018, new species
Creators: name: Tanasevitch, Andrei V.
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Pahangone
Pahangone mirabilis

description: Pahangone mirabilis, new species (Figs. 1–17) Holotype. Male (SMF), WEST MALAYSIA, Pahang State, Frazer’s Hill, Hemmant trail, Lady Guillemard road, 3°42′55.85″N 101°44′19.15″E, 1,275 m a.s.l., secondary forest, at night, by hand, 15.II.2015, leg. P. Jäger & T. Laufs. Paratype. 1 female, collected together with the holotype. Name. The specific name, mirabilis, is a Latin adjective, meaning “amazing”, “surprising”, referring the peculiar structure of the male palp. Description. Male holotype. Total length 2.25. Carapace 0.90 long, 0.70 wide, pale brown, with a smooth and gentle elevation behind posterior row of eyes as shown in Figs. 1 and 2. Sulci absent. Eyes slightly enlarged. Chelicerae 0.38 long, mastidion absent. Legs pale yellow. Leg I 4.68 long (1.25+0.28+1.25+1.15+0.75), IV 4.11 long (1.15+0.25+1.00+1.08+0.63). Chaetotaxy 2.2.1.1, spines very long, its length about 2.5–3.5 diameters of segment. Each metatarsus with a trichobothrium. TmI 0.49. Palp (Figs. 10–17): tibia strongly modified, bearing three outgrowths differing in shape. Cymbium with a posterodorsal conical extention bent backwards. Paracymbium massive, its distal part with a ventral keel-shaped lobe. Distal suprategular apophysis strongly developed and sclerotised. Its distal part bent and surrounding the embolic division. Radix membranous. Embolus relatively short, bent at base, gradually broadening distad. Median membrane small, poorly-visible. Abdomen 1.38 long, 0.80 wide, dorsal pattern as shown in Fig. 2. Female. Total length 2.30. Carapace slightly prominent dorsally as shown in Fig. 5; 0.80 long, 0.68 wide, pale brown. Chelicerae 0.33 long. Legs pale yellow. Leg I 4.10 long (1.15+0.20+1.05+1.00+0.70), IV 3.88 long (1.15+0.20+0.95+1.00+0.58). Chaetotaxy: spines mostly lost, but should be same as in male. Each metatarsus with a trichobothrium. TmI 0.48. Abdomen 1.53 long, 1.10 wide, dorsal pattern as shown in Fig. 3. Epigyne convex, cavity covered with an elongated, dark median plate (Figs. 5–9). Receptacles elongated, translucent on each side of epigynal plate. Distribution. Known from the type locality, Frazer’s Hill, in the Malay Peninsula, West Malaysia.
description: Published as part of Tanasevitch, Andrei V., 2018, A new erigonine genus and species from West Malaysia (Araneae: Linyphiidae), pp. 408-412 in Raffles Bulletin of Zoology 66 on page 411, DOI: 10.5281/zenodo.5359317
Minisymposium 11: Frühe mathematische Bildung
Creators: name: Bruns, Julia
name: Lüken, Miriam M.
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2023
Subjects: subject: Frühe mathematische Bildung
subject: Elementarbereich
subject: frühpädagogische Fachkraft
subject: 510

description: Das Symposium Frühe mathematische Bildung bot ein Diskussionsforum für aktuelle Forschung zum mathematischen Lernen der 0- bis 7-Jährigen. In diesem Jahr war mit zwei Vorträgen insbesondere die Perspektive der Fachkraft vertreten, ein Vortrag fokussierte darüber hinaus den Einfluss des Lernsettings auf das mathematische Lernen der Kinder. Allen Beiträgen ist gemeinsam, dass sie das kindliche mathematische Lernen im Kontext von Spiel- und Alltagssituationen untersuchen. Frühes mathematisches Lernen kann in der Kindertagesstätte insbesondere durch qualitativ hochwertige Interaktionen zwischen frühpädagogischen Fachkräften und Kindern gefördert werden. Mit unterschiedlichen Formen solcher Interaktionen beschäftigten sich die ersten beiden Vorträge des Minisymposiums. Lena Aumann und Hedwig Gasteiger fokussierten dabei auf das Feedback, das frühpädagogische Fachkräfte in spielbasierten Lernsituationen der Kindertagesstätte geben. Feedback scheint eine bedeutende Rolle in Erwachsenen-Kind-Interaktionen zu spielen und kann in positives und negatives Feedback unterschieden werden. Aumann und Gasteiger unterschieden und charakterisierten diese in weitere, unterschiedliche Formen von Feedback und konnten eine hohe Rate an Feedback in spielbasierten Einszu-Eins-Interaktionen zeigen. Darüber hinaus arbeiteten sie eine Art von negativem, jedoch konstruktivem Feedback heraus, das weiter daraufhin untersucht werden sollte, inwiefern es die kindliche mathematische Entwicklung positiv beeinflussen könnte.
Extended Parrondo's Game and Brownian Ratchets: Strong and Weak Parrondo Effect
Creators: name: Wu, Degang
name: Szeto, Kwok Yip
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Inspired by the flashing ratchet, Parrondo's game presents an apparently paradoxical situation. Parrondo's game consists of two individual games, game A and game B. Game A is a slightly losing coin-tossing game. Game B has two coins, with an integer parameter $M$. If the current cumulative capital (in discrete unit) is a multiple of $M$, an unfavorable coin $p_b$ is used, otherwise a favorable $p_g$ coin is used. Paradoxically, combination of game A and game B could lead to a winning game, which is the Parrondo effect. We extend the original Parrondo's game to include the possibility of $M$ being either $M_1$ or $M_2$. Also, we distinguish between strong Parrondo effect, i.e. two losing games combine to form a winning game, and weak Parrondo effect, i.e. two games combine to form a better-performing game. We find that when $M_2$ is not a multiple of $M_1$, the combination of $B(M_1)$ and $B(M_2)$ has strong and weak Parrondo effect for some subsets in the parameter space $(p_b,p_g)$, while there is neither strong nor weak effect when $M_2$ is a multiple of $M_1$. Furthermore, when $M_2$ is not a multiple of $M_1$, stochastic mixture of game A may cancel the strong and weak Parrondo effect. Following a discretization scheme in the literature of Parrondo's game, we establish a link between our extended Parrondo's game with the analysis of discrete Brownian ratchet. We find a relation between the Parrondo effect of our extended model to the macroscopic bias in a discrete ratchet. The slope of a ratchet potential can be mapped to the fair game condition in the extended model, so that under some conditions, the macroscopic bias in a discrete ratchet can provide a good predictor for the game performance of the extended model. On the other hand, our extended model suggests a design of a ratchet in which the potential is a mixture of two periodic potentials.
Spin Hall torque magnetometry of Dzyaloshinskii domain walls
Creators: name: Emori, Satoru
name: Martinez, Eduardo
name: Lee, Kyung-Jin
name: Lee, Hyun-Woo
name: Bauer, Uwe
name: Ahn, Sung-Min
name: Agrawal, Parnika
name: Bono, David C.
name: Beach, Geoffrey S. D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Current-induced domain wall motion in the presence of the Dzyaloshinskii-Moriya interaction (DMI) is experimentally and theoretically investigated in heavy-metal/ferromagnet bilayers. The angular dependence of the current-induced torque and the magnetization structure of Dzyaloshinskii domain walls are described and quantified simultaneously in the presence of in-plane fields. We show that the DMI strength depends strongly on the heavy metal, varying by a factor of 20 between Ta and Pa, and that strong DMI leads to wall distortions not seen in conventional materials. These findings provide essential insights for understanding and exploiting chiral magnetism for emerging spintronics applications.
Minisymposium 12: Digitalisierung und mathematisches Lernen in den Sekundarstufen
Creators: name: Thurm, Daniel
name: Barzel, Bärbel
name: Weigand, Hans-Georg
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2023
Subjects: subject: Digitale Werkzeuge
subject: Technologie
subject: Distance-Learning
subject: 510

description: Das Thema Digitalisierung wird seit vielen Jahren in der Mathematikdidaktik intensiv diskutiert und hat durch die aktuelle (Corona-)Situation noch einmal ganz erheblich an Bedeutung gewonnen. Die COVID 19-Pandemie hat viele Fragen und neue Impulse zum Einsatz digitaler Medien im Mathematikunterricht aufgebracht. Allerdings wurden diese Fragen vielfach spontan und ohne größere theoretische Hintergrundkonzeption beantwortet und in gleicher Weise wurden Impulse häufig intuitiv umgesetzt. Es stellt sich somit jetzt einerseits die Frage nach bereits bewährten und erprobten Konzepten, die Zukunftspotential für die nächsten Jahre haben. Andererseits benötigen wir aber auch innovative neue Entwicklungen für ein effektives Lernen und Lehren mit digitalen Technologien. Dieses Minisymposium will das Spektrum für den Mathematikunterricht anhand der folgenden thematischen Schwerpunkte aufzeigen:Lernen & Lehren mit Technologie Es gilt die zahlreichen auf theoretischen Überlegungen und empirischen Untersuchungen basierenden Unterrichtsvorschläge konstruktiv, sinnstiftend und verstehensorientiert weiterzuentwickeln und zu evaluieren. Technologie-Entwicklung Es gilt digitale Angebote wie Apps, Lernvideos, digitale Schulbücher, Augmented und Virtual Reality mit Blick auf Praxisrelevanz weiterzuentwickeln und zu erproben. Blended-Learning / Distance-Learning Es gilt die zahlreichen Ansätze, Konzepte und Impulse zum Blended-Learning und Distance-Learning, welche z.B. im Zuge der Schulschließungen entwickelt und erprobt wurden, zu fundieren und weiterzuentwickeln.
Self-healing Dynamics of Surfactant Coatings on Thin Viscous Films
Creators: name: Strickland, Stephen L.
name: Hin, Matthew
name: Sayanagi, M. Richard
name: Conti, Cameron
name: Daniels, Karen E.
name: Levy, Rachel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We investigate the dynamics of an insoluble surfactant on the surface of a thin viscous fluid spreading inward to fill a surfactant-free region. During the initial stages of surfactant self-healing, Marangoni forces drive an axisymmetric ridge inward to coalesce into a growing central distension; this is unlike outward-spreading, in which the ridge decays. In later dynamics, the distension slowly decays and the surfactant concentration equilibrates. We present results from experiments in which we simultaneously measure the surfactant concentration (using fluorescently-tagged lipids) and the fluid height profile (via laser profilometry). We compare the results to simulations of a mathematical model using parameters from our experiments. For surfactant concentrations close to but below the critical monolayer concentration, we observe agreement between the height profiles in the numerical simulations and the experiment, but disagreement in the surfactant distribution. In experiments at lower concentrations, the surfactant spreading and formation of a Marangoni ridge are no longer present, and a persistent lipid-free region remains. This observation, which is not captured by the simulations, has undesirable implications for applications where uniform coverage is advantageous. Finally, we probe the generality of the effect, and find that distensions of similar size are produced independent of initial fluid thickness, size of initial clean region, and surfactant type.
description: Arguments concerning the timescale in section 2 have been revised. Results unchanged
An explicit Z'-boson explanation of the B->K*mu+mu- anomaly
Creators: name: Gauld, Rhorry
name: Goertz, Florian
name: Haisch, Ulrich
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A global fit to the recent B->K*mu+mu- data shows indications for a large new-physics contribution to the Wilson coefficient of the semi-leptonic vector operator. In this article we consider a simple Z'-boson model of 3-3-1 type that can accommodate such an effect without violating any other constraint from quark-flavour physics. Implications for yet unobserved decay modes such as B->Xsnunubar and longstanding puzzles like B->piK are also discussed. The Z'-boson masses required to address the observed anomaly lie in the range of 7 TeV. Such heavy Z' bosons evade the existing bounds from precision data and direct searches, and will remain difficult to discover even at a high-luminosity LHC. The potential of an ILC as well as the next generation of low-energy parity-violation experiments in constraining the Z'-boson parameter space is also examined.
description: 20 pages, 5 figures; v2: Eqs. (9.2), (9.4) and (9.5) corrected, typos fixed and references added; matches version published in JHEP
Revisão rápida sobre a eficácia e a segurança do esquema Di-hidroartemisinina mais piperaquina no tratamento da malária por Plasmodium falciparum e Plasmodium vivax - Protocolo
Creators: name: Silva, João Gabriel Sanchez Tavares da
name: Angotti, Alanis Amorim
name: Yonekura, Tatiana
name: Figueiró, Mabel Fernandes
Publisher: name: Zenodo
Year: 2022
Subjects: Malária Vivax
Di-hidroartemisinina-Piperaquina (DHP)
Malária Falciparum
Plasmodium vivax
Plasmodium falciparum
Revisão rápida

description: Objetivo: Identificar estudos que avaliaram a eficácia e segurança do uso do esquema terapêutico com Di-hidroartemisinina (DHA) mais piperaquina (PPQ) para o tratamento da malária ocasionada por P. falciparum e/ou Plasmodium vivax e mista. Metodologia: será realizada uma revisão rápida seguindo as recomendações do Cochrane Rapid Reviews Methods Group. A busca dos estudos será realizada nas seguintes fontes de informações: PubMed, Embase, Cochrane Library, Biblioteca Virtual em Saúde (BVS) e Epistemonikos. As etapas de triagem pelo título e resumo e leitura do texto integral dos estudos serão realizadas por dupla de revisores de forma independente e cega. No caso de divergências na seleção dos estudos, estas serão resolvidas por um terceiro revisor. Espera-se encontrar evidências com resultados que mostrem a eficácia e segurança do uso da terapêutica da Di-hidroartemisinina (DHA) mais piperaquina (PPQ), sendo este um esquema terapêutico para substituir o artesunato+mefloquina.
description: Financiamento: essa revisão faz parte do projeto "Desenvolvimento, Implementação e Disseminação de Políticas Informadas por Evidências" (portaria N.º 3.823, 29 de dezembro de 2020), realizado pelo Hospital do Coração dentro do Programa de Apoio ao Desenvolvimento Institucional do Sistema Único de Saúde (PROADI-SUS).
Magnetic Coupling and Single-Ion Anisotropy in Surface-Supported Mn-based Metal-Organic Networks
Creators: name: Giovanelli, L.
name: Savoyant, A.
name: Abel, M.
name: Maccherozzi, F.
name: Ksari, Y.
name: Koudia, M.
name: Hayn, R.
name: Choueikani, F.
name: Otero, E.
name: Ohresser, P.
name: Themlin, J. -M.
name: Dhesi, S. S.
name: Clair, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The electronic and magnetic properties of Mn coordinated to 1,2,4,5-tetracyanobenzene (TCNB) in the Mn-TCNB 2D metal-ligand networks have been investigated by combining scanning tunneling microscopy and X-ray magnetic circular dichroism (XMCD) performed at low temperature (3 K). When formed on Au(111) and Ag(111) substrates the Mn-TCNB networks display similar geometric structures. Magnetization curves reveal ferromagnetic (FM) coupling of the Mn sites with similar single-ion anisotropy energies, but different coupling constants. Low-temperature XMCD spectra show that the local environment of the Mn centers differs appreciably for the two substrates. Multiplet structure calculations were used to derive the corresponding ligand field parameters confirming an in-plane uniaxial anisotropy. The observed interatomic coupling is discussed in terms of superexchange as well as substrate-mediated magnetic interactions.
description: J. Phys. Chem. C 2014
Open Science and Recognition & Rewards need each other
Creators: name: Bosch, Sander
Publisher: name: Zenodo
Year: 2023
Subjects: Open Science
Recognition & Rewards

description: This presentation was used for a talk at the DCC-OSCT meeting on 30-03-2023. There is a lot of momentum for both a more transparent and inclusive way of working in academia (Open Science) and a more fairly balanced system of Recognition & Rewards that does justice to the multitude of roles and tasks in academia. In this talk, I will reflect on how Open Science and Recognition & Rewards relate to each other in the context of a university, drawing from experiences from local (VU) and national Open Science programs and Recognition & Rewards initiatives.
A class of exactly solvable models for the Schrodinger equation
Creators: name: Downing, C. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a class of confining potentials which allow one to reduce the one-dimensional Schroodinger equation to a named equation of mathematical physics, namely either Bessel's or Whittaker's differential equation. In all cases, we provide closed form expressions for both the symmetric and antisymmetric wavefunction solutions, each along with an associated transcendental equation for allowed eigenvalues. The class of potentials considered contains an example of both cusp-like single wells and a double-well.
description: 5 pages, 7 figures
Microwave-controlled generation of shaped single photons in circuit quantum electrodynamics
Creators: name: Pechal, M.
name: Huthmacher, L.
name: Eichler, C.
name: Zeytinoglu, S.
name: Abdumalikov, A. A.
name: Berger, S.
name: Wallraff, A.
name: Filipp, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Large-scale quantum information processors or quantum communication networks will require reliable exchange of information between spatially separated nodes. The links connecting these nodes can be established using traveling photons that need to be absorbed at the receiving node with high efficiency. This is achievable by shaping the temporal profile of the photons and absorbing them at the receiver by time reversing the emission process. Here, we demonstrate a scheme for creating shaped microwave photons using a superconducting transmon-type three-level system coupled to a transmission line resonator. In a second-order process induced by a modulated microwave drive, we controllably transfer a single excitation from the third level of the transmon to the resonator and shape the emitted photon. We reconstruct the density matrices of the created single-photon states and show that the photons are antibunched. We also create multipeaked photons with a controlled amplitude and phase. In contrast to similar existing schemes, the one we present here is based solely on microwave drives, enabling operation with fixed frequency transmons.
Single-molecule-mediated heat current between an electronic and a bosonic bath
Creators: name: Vinkler-Aviv, Yuval
name: Schiller, Avraham
name: Andrei, Natan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In molecular devices electronic degrees of freedom are coupled to vibrational modes of the molecule, offering an opportunity to study fundamental aspects of this coupling between at the nanoscale. To this end we consider the nonequilibrium heat exchange between a conduction band and a bosonic bath mediated by a single molecule. For molecules large enough so that on-site interactions can be dropped we carry out an asymptotically exact calculation of the heat current, governed by the smallness of the electron-phonon coupling, and obtain the steady state heat current driven by a finite temperature drop. At low temperatures the heat current is found to have a power-law behavior with respect to the temperature difference with the power depending on the nature of the bosonic bath. At high temperatures, on the other hand, the current is linear in the temperature difference for all types of bosonic baths. The crossover between these behaviors is described. Some of the results are given a physical explanation by comparing to a perturbative Master equation calculation (whose limitation we examine).
Generating a state $t$-design by diagonal quantum circuits
Creators: name: Nakata, Yoshifumi
name: Koashi, Masato
name: Murao, Mio
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate protocols for generating a state $t$-design by using a fixed separable initial state and a diagonal-unitary $t$-design in the computational basis, which is a $t$-design of an ensemble of diagonal unitary matrices with random phases as their eigenvalues. We first show that a diagonal-unitary $t$-design generates a $O(1/2^N)$-approximate state $t$-design, where $N$ is the number of qubits. We then discuss a way of improving the degree of approximation by exploiting non-diagonal gates after applying a diagonal-unitary $t$-design. We also show that it is necessary and sufficient to use $O(\log_2 t)$-qubit gates with random phases to generate a diagonal-unitary $t$-design by diagonal quantum circuits, and that each multi-qubit diagonal gate can be replaced by a sequence of multi-qubit controlled-phase-type gates with discrete-valued random phases. Finally, we analyze the number of gates for implementing a diagonal-unitary $t$-design by {\it non-diagonal} two- and one-qubit gates. Our results provide a concrete application of diagonal quantum circuits in quantum informational tasks.
description: ver. 1: 15 pages, 1 figures. ver.2: 16 pages, 2 figures, major changes, we corrected a mistake, which slightly changes a main conclusion, added a new result, and improved a presentation. ver.3: 11 pages, 2 figures, published version
Körperliche Aktivität – Eine Intervention mit Wirkung: Wie können Menschen mit einer diagnostizierten Depression in der lösungs- und kompetenzorientierten Beratung unterstützt werden, die für sie passende körperliche Aktivität im Alltag umzusetzen?
Creators: name: Iselin, Corinne
Publisher: name: Zenodo
Year: 2022

description: Dass körperliche Aktivität die Gesundheit fördert, ist bekannt. Die Erkenntnis, dass sie auch eine antidepressive Wirkung haben und sogar eine Therapie ersetzen kann, macht gerade in der Beratung von erkrankten Meneschen besonders auf dieses Thema aufmerksam. Die Depression ist eine Krankheit, die sich nicht nur auf die Betroffenen und ihr Umfeld auswirkt, sondern auch auf das Gesundheitswesen und den Arbeitsmarkt. So ist rund ein Drittel der Schweizer Bevölkerung, in unterschiedlicher Ausprägung von dieser Krankheit betroffen und nimmt Beratungsgespräche oder eine Therapie in Anspruch. Die Lösungs- und Kompetenzorientierung (LKO) bietet in der Beratung vielfältige Möglichkeiten, um eine Person in unterschiedlichen Lebenslagen zu begleiten. Die vorliegende Literaturarbeit befasst sich deshalb mit der Frage, wie Menschen mit einer diagnostizierten Depression in der lösungs- und kompetenzorientierten Beratung dabei unterstützt werden können, eine für sie passende körperliche Aktivität im Alltag umzusetzen. Die Betrachtung analysiert zum einen die körperliche Aktivität an sich und widmet sich unter anderem den Fragen, was diese zur psychischen Gesundheit beitragen kann, welche Empfehlungen es für eine geeignete Umsetzung gibt und wie sich die psychischen Symptome auf das Bewegungsverhalten von Erkrankten auswirken. Zum anderen wird aufgezeigt, was Menschen dazu bringt, ihr Gesundheitsverhalten zu ändern. Anhand des Prozessmodells gesundheitlichen Handelns (HAPA) wird ersichtlich, dass die Planung neben der Motivation einen bedeutenden Bestandteil des Veränderungsprozesses darstellt. Wie Beratende mit dem lösungs- und kompetenzorientierten Ansatz und dessen Instrumenten Klient:innen unterstützen und auf deren Verhalten Einfluss nehmen können, wird anhand der Theorie begründet und mit den erarbeiteten Erkenntnissen zu den Themen körperliche Aktivität und Depression für die Umsetzung in die Praxis verknüpft. Im Ergebnis wird deutlich, dass die Entscheidung für eine körperlichen Aktivität stets bei den Klient:innen bleibt, die Beratenden dabei jedoch eine supportive Rolle einnehmen können. Die Resultate zeigen zudem, dass es an Depressionen erkrankten Personen trotz zahlreicher Hürden möglich ist, körperliche Aktivitäten im Alltag umzusetzen. Voraussetzung ist, dass Klient:innen in der Lage sind, zu kooperieren, und Bereitschaft zeigen, am Veränderungsprozess zu arbeiten. Die LKO erweist sich dabei sowohl für die Begleitung im Veränderungsprozess als auch für Menschen mit einer Depression als ideale Methode der Beratung.
description: + Code Diss LU: hslusa mas lko + Fussnote: Master-Arbeit MAS Lösungs- und Kompetenzorientierung, Hochschule Luzern – Soziale Arbeit, 2022 + NL-Code: NLLUHSA202211
EDU-STEM - Equity and Diversity in Undergraduate STEM (RCN-UBE Introduction)
Creators: name: Cotner, Sehoya
name: Ballen, Cissy
name: Robnett, Rachael
name: Harshman, Jordan
name: Fagbodun, Sheritta
Publisher: name: QUBES Educational Resources
Year: 2023

description: EDU-STEM is Equity and Diversity in Undergraduate Science, Technology, Engineering and Mathematics (STEM), a network funded by the National Science Foundation to support the research-coordination efforts of those interested in equitable teaching practices in introductory biology. The EDU-STEM network is a sustained multi-institutional education research and implementation research-coordination network, initially centering on introductory biology. This network is motivated by a focus on equity and inclusion in large introductory biology courses.
Bistable dynamics underlying excitability of ion homeostasis in neuron models
Creators: name: Hübel, Niklas
name: Schöll, Eckehard
name: Dahlem, Markus A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: When neurons fire action potentials, dissipation of free energy is usually not directly considered, because the change in free energy is often negligible compared to the immense reservoir stored in neural transmembrane ion gradients and the long-term energy requirements are met through chemical energy, i.e., metabolism. However, these gradients can temporarily nearly vanish in neurological diseases, such as migraine and stroke, and in traumatic brain injury from concussions to severe injuries. We study biophysical neuron models based on the Hodgkin-Huxley (HH) formalism extended to include time-dependent ion concentrations inside and outside the cell and metabolic energy-driven pumps. We reveal the basic mechanism of a state of free energy-starvation (FES) with bifurcation analyses showing that ion dynamics is for a large range of pump rates bistable without contact to an ion bath. This is interpreted as a threshold reduction of a new fundamental mechanism of 'ionic excitability' that causes a long-lasting but transient FES as observed in pathological states. We can in particular conclude that a coupling of extracellular ion concentrations to a large glial-vascular bath can take a role as an inhibitory mechanism crucial in ion homeostasis, while the Na$^+$/K$^+$ pumps alone are insufficient to recover from FES. Our results provide the missing link between the HH formalism and activator-inhibitor models that have been successfully used for modeling migraine phenotypes, and therefore will allow us to validate the hypothesis that migraine symptoms are explained by disturbed function in ion channel subunits, Na$^+$/K$^+$ pumps, and other proteins that regulate ion homeostasis.
description: 14 pages, 8 figures, 4 tables
Non-conventional superconducting fluctuations in Ba(Fe1-xRhx)2As2 iron-based superconductors
Creators: name: Bossoni, L.
name: Romanò, L.
name: Canfield, P. C.
name: Lascialfari, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We measured the static uniform spin susceptibility of Ba(Fe$_{1-x}$Rh$_x$)$_2$As$_2$ iron-based superconductors, over a broad range of doping ($0.041\leq x\leq 0.094$) and magnetic fields. At small fields ($H \le$ 1 kOe) we observed, above the transition temperature $T_c$, the occurrence of precursor diamagnetism, which is not ascribable to the Ginzburg-Landau theory. On the contrary, our data fit a phase fluctuation model, which has been used to interpret a similar phenomenology occurring in the high-$T_c$ cuprate superconductors. On the other hand, in presence of strong fields the unconventional fluctuating diamagnetism is suppressed, whereas 3D fluctuations are found, in agreement with literature.
1/2-BPS Domain wall from N=10 three dimensional gauged supergravity
Creators: name: Karndumri, Parinya
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We explicitly construct $N=10$ Chern-Simons gaged supergravity in three dimensions with non-semisimple gauge group $SO(5)\ltimes \mathbf{T}^{10}$. The gauge group is embedded in $E_{6(-14)}$ which is the isometry group of the 32-dimensional scalar manifold $E_{6(-14)}/SO(10)\times U(1)$. The resulting theory is on-shell equivalent to $SO(5)$ Yang-Mills gauged supergravity coming from dimensional reduction on $S^1$ of $SO(5)$ $N=5$ gauged supergravity in four dimensions. We discuss the spectrum of the corresponding reduction. The $SO(5)\ltimes \mathbf{T}^{10}$ gauged supergravity, describing the reduced theory, admits a $\frac{1}{2}$-BPS domain wall vacuum solution whose explicit form is also given. This provides an example of a domain wall in non-maximal gauged supergravity.
description: 20 pages no figures, the wrong number of the unbroken supersymmetry corrected and a few references added