cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Jeux pour apprendre et enseigner l’éducation au développement durable : explorer la pertinence du jeu et l’apprentissage expérientiel pour la durabilité
Creators: name: LEFDAOUI, YOUSSEF
name: BOUBKER, NEJJAR
name: NAFIL, KHALID
Publisher: name: Educational Journal of the University of Patras UNESCO Chair
Year: 2014
Subjects: Serious games, education to sustainable development, experiential learning

description: In engineering education, the traditional process of knowledge construction uses a one-way channel of communication and information dissemination which is that of the teacher to the student, the latter playing the role of passive receiver relative to the offer proposed by the teacher. In recent years, the trend is towards active learning paradigm where students are at the center of the educational process. The interaction between teacher and students is more dynamic, strengthened by technological tools, it has rich content and flexible activities. Integration of Virtual Environments based on simulation games in training technicians to engage in innovative learning experiences, contributes to these new paradigms. This paper presents the implementation of these methods of learning with students in second year of technical training in civil engineering. In our study, students were involved in simulation environments / serious game: EnerCities, based on an experiential learning uses of renewable energies in the context of sustainable development of a virtual city game. Afterwards, their knowledge was tested and their perception of the relevance of the game system was evaluated. The results show that the construction of knowledge has been greatly improved and student motivation for learning was increased.
description: Educational Journal of the University of Patras UNESCO Chair, Vol. 1, N. 2 (2014) - Colloque SIEST Méditerranée, Rabat 2014
title: Lolium perenne
title: Ausdauernder Lolch (Lolium perenne)
titleType: AlternativeTitle
Creators: name: Schulz, Herbert
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2006
Subjects: subject: Deutsches Weidelgras
subject: Englisches Raygras
subject: Diasammlung Herbert Schulz
subject: 580

description: Enthält 5 Bilder des Ausdauernden Lolchs.
title: Calamagrostis arundinacea
title: Wald-Reitgras (Calamagrostis arundinacea)
titleType: AlternativeTitle
Creators: name: Schulz, Herbert
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2006
Subjects: subject: Diasammlung Herbert Schulz
subject: 580

description: Enthält 3 Bilder des Wald-Reitgrases.
A System Modeling Approach to Enhance Functional and Software Development
Creators: name: Tiwari, Saurabh
name: Smajlovic, Emina
name: Krekic, Amina
name: Suryadevara, Jagadish
Publisher: name: arXiv
Year: 2019
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: This paper presents a SysML-based approach to enhance functional and software development process within an industrial context. The recent changes in technology such as electromobility and increased automation in heavy construction machinery lead to increased complexity for embedded software. Hence there emerges a need for new development methodologies to address flexible functional development, enhance communication among development teams, and maintain traceability from design concepts to software artefacts. The discussed approach has experimented in the context of developing a new transmission system (partially electrified) and its functionality. While the modeling approach is a work-in-progress, some initial success, as well as existing gaps pointing to future works are highlighted.
description: 6 Pages, In 2018 Software Technologies: Applications and Foundations Workshop (MDE@DeRun 2018). STAF 2018
title: 01_0532
Creators: name: Wesley Baldwin, John
name: Baldwin, John W.
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: L'ensemble de ces notes ont été crée par John Baldwin lors d'une de ses premières périodes de résidence à Paris. Ces documents comprennent tous les magistri qu’il avait pu rencontrer dans ses sources. Aux XIIème et XIIIème siècles, les universités n'existant pas encore, le titre de magister s'il évoque certainement une compétence n'est pas rattaché de façon systématique au passage par les écoles. De surcroît, les magistris sont le plus souvent désignés par leur seul prénom. La lecture de ces données est donc difficile et suppose un long travail pour tenter d'identifier un individu auquel on pourrait rattacher plusieurs mentions. John Baldwin avait donc renoncé à utiliser ces données pour donner un prolongement à sa magnifique étude sur les gradués d'université et leur emploi par les Capétiens et les Plantagenêts. Néanmoins, il a conservé ces données et elles sont potentiellement très utile dans le cadre de Studium, comme le sont toutes les mentions dans les volumes des Fasti Ecclesiae Gallicanae de chanoines portant ce titre de magister sans autres précisions. L'ampleur des dépouillements rend ces données très utiles et nous devons une grande reconnaissance à John Baldwin pour avoir pris la peine de faire photocopier ses fiches et de nous les avoir transmises amicalement.
Les données ainsi que les images des fiches sont accessibles sur le site Internet à l'adresse suivante : http://studium-baldwin.lamop.fr/.
Les transcriptions des fiches ont été effectuées par des étudiants de Paris 1 Panthéon - Sorbonne mais elles n'ont pas été corrigées par la suite.
description: Relation: https://lamop.hypotheses.org/
Efficient calculation of the mutual inductance of arbitrarily oriented circular filaments via a generalisation of the Kalantarov-Zeitlin method
Creators: name: Poletkin, Kirill V.
name: Korvink, Jan G.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Classical Physics (physics.class-ph)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: In this article, we present a new analytical formulation for calculation of the mutual inductance between two circular filaments arbitrarily oriented with respect to each other, as an alternative to Grover [1] and Babic [2] expressions reported in 1944 and 2010, respectively. The formula is derived via a generalisation of the Kalantarov-Zeitlin method, which showed that the calculation of mutual inductance between a circular primary filament and any other secondary filament having an arbitrary shape and any desired position with respect to the primary filament is reduced to a line integral. In particular, the obtained formula provides a solution for the singularity issue arising in the Grover and Babic formulas for the case when the planes of the primary and secondary circular filaments are mutually perpendicular. The efficiency and flexibility of the Kalantarov-Zeitlin method allow us to extend immediately the application of the obtained result to a case of the calculation of the mutual inductance between a primary circular filament and its projection on a tilted plane. Newly developed formulas have been successfully validated through a number of examples available in the literature, and by a direct comparison with the results of calculation performed by the FastHenry software.
description: 34 pages, 14 figures
Multi-physics simulations of lightning strike on elastoplastic substrates
Creators: name: Millmore, Stephen
name: Nikiforakis, Nikolaos
Publisher: name: arXiv
Year: 2019
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Applied Physics (physics.app-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: This work is concerned with the numerical simulation of elastoplastic, electromagnetic and thermal response of aerospace materials due to their interaction with a plasma arc under lightning strike conditions. Current approaches treat the interaction between these two states of matter either in a decoupled manner or through one-way coupled 'co-simulation'. In this paper a methodology for multiphysics simulations of two-way interaction between lightning and elastoplastic materials is presented, which can inherently capture the non-linear feedback between these two states of matter. This is achieved by simultaneously solving the magnetohydrodynamic and the elastoplastic systems of equations on the same computational mesh, evolving the magnetic and electric fields dynamically. The resulting model allows for the topological evolution and movement of the arc attachment point coupled to the structural response and Joule heating of the substrate. The dynamic communication between the elastoplastic material and the plasma is facilitated by means of Riemann problem-based ghost fluid methods. This two-way coupling, to the best of the authors' knowledge, has not been previously demonstrated. The proposed model is first validated against experimental laboratory studies, demonstrating that the growth of the plasma arc can be accurately reproduced, dependent on the electrical conductivity of the substrate. It is then subsequently evaluated in a setting where the dynamically-evolved properties within the substrate feed back into the plasma arc attachment. Results are presented for multi-layered substrates of different materials, and for a substrate with temperature-dependent electrical conductivity. It is demonstrated that these conditions generate distinct behaviour due to the interaction between the plasma arc and the substrate.
description: 20 pages, 16 figures
Quantum (1+1) extended Galilei algebras: from Lie bialgebras to quantum R-matrices and integrable systems
Creators: name: Ballesteros, Angel
name: Celeghini, Enrico
name: Herranz, Francisco J.
Publisher: name: arXiv
Year: 1999
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: The Lie bialgebras of the (1+1) extended Galilei algebra are obtained and classified into four multiparametric families. Their quantum deformations are obtained, together with the corresponding deformed Casimir operators. For the coboundary cases quantum universal R-matrices are also given. Applications of the quantum extended Galilei algebras to classical integrable systems are explicitly developed.
description: 16 pages, LaTeX. A detailed description of the construction of integrable systems is carried out
title: Calamagrostis epigejos
title: Land-Reitgras (Calamagrostis epigejos)
titleType: AlternativeTitle
Creators: name: Schulz, Herbert
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2006
Subjects: subject: Diasammlung Herbert Schulz
subject: 580

description: Enthält 5 Bilder des Land-Reitgrases.
Additional file 1: of Association between Schistosoma mansoni infection and access to improved water and sanitation facilities in Mwea, Kirinyaga County, Kenya
Creators: name: Gichuki, Paul
name: Kepha, Stella
name: Mulewa, Damaris
name: Masaku, Janet
name: Kwoba, Celestine
name: Mbugua, Gabriel
name: Mazigo, Humphrey
name: Mwandawiro, Charles
Publisher: name: figshare
Year: 2019
Subjects: subject: Space Science
subject: Medicine
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: 60506 Virology
subject: Computational Biology

description: Household questionnaire. (DOCX 26 kb)
Simultaneous approximation and interpolation of functions on continua in the complex plane
Creators: name: Andrievskii, V. V.
name: Pritsker, I. E.
name: Varga, R. S.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Complex Variables (math.CV)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 30E10, 41A10

description: We construct polynomial approximations of Dzjadyk type (in terms of the k-th modulus of continuity, $k \ge 1$) for analytic functions defined on a continuum E in the complex plane, which simultaneously interpolate at given points of E. Furthermore, the error in this approximation is decaying as $e^{-cn^α}$ strictly inside E, where c and $α$ are positive constants independent of the degree n of the approximating polynomial.
description: 21 page; submitted to J. Math. Pures Appl
Essays on the Political Economy of Foreign Direct Investment
Creators: Zhu, Boliang
Publisher: name: Columbia University
Year: 2012
Subjects: subject: Political science
subject: FOS: Political science

description: This dissertation studies the causes and consequences of inflows of foreign direct investment (FDI). The first chapter identifies and explains a skill bias in the sectoral composition of inward FDI in developing countries; that is, high-skill intensive FDI constitutes a large share of total FDI inflows in autocracies, while low-skill intensive FDI takes a relatively high proportion in democracies. In this chapter, I develop a political economy framework to explain the empirical pattern and argue that the skill bias is an outcome of the interaction between a country's underlying distribution of skills and the logic of political survival. Distinct institutional constraints drive political leaders in autocracies and democracies to adopt different policies toward these two types of FDI to extend benefits to their core constituencies, thus generating a skill bias in the sectoral composition of inward FDI across political regimes. Empirical evidence based on available sectoral FDI data in developing countries supports my argument. To further illustrate the causal mechanisms, Chapter 2 briefly examines FDI policy in China and Taiwan. In Chapter 3, I employ a survey experiment implemented in China to examine the distributional effects of high-skill and low-skill intensive FDI derived in Chapter 1. The results suggest that respondents' skill level is positively and strongly associated with support for high-skill intensive FDI but has no significant effect on their support for low-skill intensive FDI. These findings provide support for the micro-foundations of the political economy framework developed in Chapter 1. Finally, Chapter 4 examines the relationship between economic integration and corruption in China. Using an original dataset of corruption cases to measure corruption at the provincial level, I find that economic integration leads to a high level of corruption in China. This finding runs counter to the conventional wisdom that economic integration helps reduce corruption and thus has important implications for both domestic and global governance. Taken together, this dissertation aims to provide more nuanced accounts of the causes and consequences of FDI inflows.
La construction de la notion de vivant et les jeux de personnages virtuels
Creators: name: EL JAMAL, RAYANNE
name: CASTÉRA, JÉRÉMY
name: BRANDT-POMARES, PASCALE
Publisher: name: Educational Journal of the University of Patras UNESCO Chair
Year: 2014
Subjects: Virtual, life, inert, video games, conceptions

description: Our research question is to understand the effects of video games including life simulation on the conceptions of living by the child and his distinction between living and inert. We aim to identify the conceptual differences between the populations of players and non-players. Thus, some games could create barriers to learning or facilitate it. We present the first stage of our study which consisted of an exploratory survey identifying the most used video games among children. Then, we’ll do a precise analysis of these games’ contents in terms of epistemological analysis about the living concept. This analysis allows us to make first assumptions about the games’ influences on children conceptions of life.
description: Educational Journal of the University of Patras UNESCO Chair, Vol. 1, N. 2 (2014) - Colloque SIEST Méditerranée, Rabat 2014
Les médias sociaux dans l’Enseignement Supérieur
Creators: name: TSITOURIDOU, MELPOMENI
name: VRYZAS, KONSTANTINOS
Publisher: name: Educational Journal of the University of Patras UNESCO Chair
Year: 2014

description: Social media are currently experiencing unprecedented growth and are integrated into the daily life of young people. Education cannot ignore this trend. The integration of social media in higher education and their adaptation to the needs of student learning is a major challenge. Research has shown that social media can be used for educational purposes. The technology is now well established in the higher education institutions and most universities have invested in a virtual learning environment. Social media are changing the way students live, learn and interact with their universities.
description: Educational Journal of the University of Patras UNESCO Chair, Vol. 2, N. 1 (2015) - Colloque SIEST Méditerranée, Rabat 2014
Theory of coherent active convolved illumination for superresolution enhancement
Creators: name: Ghoshroy, Anindya
name: Adams, Wyatt
name: Guney, Durdu O.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Recently an optical amplification process called the plasmon injection scheme was introduced as an effective solution to overcoming losses in metamaterials. Implementations with near-field imaging applications have indicated substantial performance enhancements even in the presence of noise. This powerful and versatile compensation technique, which has since been renamed to a more generalized active convolved illumination, offers new possibilities of improving the performance of many previously conceived metamaterial-based devices and conventional imaging systems. In this work, we present the first comprehensive mathematical breakdown of active convolved illumination for coherent imaging. Our analysis highlights the distinctive features of active convolved illumination, such as selective spectral amplification and correlations, and provides a rigorous understanding of the loss compensation process. These features are achieved by an auxiliary source coherently superimposed with the object field. The auxiliary source is designed to have three important properties. First, it is correlated with the object field. Second, it is defined over a finite spectral bandwidth. Third, it is amplified over that selected bandwidth. We derive the variance for the image spectrum and show that utilizing the auxiliary source with the above properties can significantly improve the spectral signal-to-noise ratio and resolution limit. Besides enhanced superresolution imaging, the theory can be potentially generalized to the compensation of information or photon loss in a wide variety of coherent and incoherent linear systems including those, for example, in atmospheric imaging, time-domain spectroscopy, ${\cal PT}$ symmetric non-Hermitian photonics, and even quantum computing.
description: revised, more details and references added
Affine Sergeev Algebra and $q$-Analogues of the Young Symmetrizers for Projective Representations of the Symmetric Group
Creators: name: Jones, Andrew
name: Nazarov, Maxim
Publisher: name: arXiv
Year: 1997
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: We study a $q$-deformation for the semi-direct product of the symmetric group $S_n$ with the Clifford algebra on $n$ anticommuting generators. We obtain a $q$-version of the projective analogue for the classical Young symmetrizer found by the second author [Adv. Math. 127(1997), 190-257]. Our main tool is an analogue of the Hecke algebra of complex valued functions on the group $GL_{n}$ over a $p$-adic field relative to the Iwahori subgroup.
description: LaTeX, 28 pages
Additional file 1: of Application of community-based and integrated strategy to reduce malaria disease burden in southern Tanzania: the study protocol of China-UK-Tanzania pilot project on malaria control
Creators: name: Wang, Duoquan
name: Chaki, Prosper
name: Mlacha, Yeromin
name: Gavana, Tegemeo
name: Michael, Mihayo
name: Khatibu, Rashid
name: Feng, Jun
name: Zhou, Zheng-Bin
name: Lin, Kang-Ming
name: Xia, Shang
name: Yan, He
name: Ishengoma, Deus
name: Rumisha, Susan
name: Mkude, Sigbert
name: Mandike, Renata
name: Chacky, Frank
name: Dismasi, Charles
name: Abdulla, Salim
name: Masanja, Honorati
name: Xiao, Ning
name: Zhou, Xiao-Nong
Publisher: name: figshare
Year: 2019
Subjects: subject: Physical Sciences not elsewhere classified
subject: Medicine
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology
subject: FOS: Biological sciences
subject: Computational Biology

description: Multilingual abstracts in the six official working languages of the United Nations. (PDF 827 kb)
title: Calamagrostis canescens
title: Sumpf-Reitgras (Calamagrostis canescens)
titleType: AlternativeTitle
Creators: name: Schulz, Herbert
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2006
Subjects: subject: Diasammlung Herbert Schulz
subject: 580

description: Enthält 2 Bilder des Sumpf-Reitgrases.
Méthode d’enseignement du traitement numérique de signal par blocs de simulation
Creators: name: JBARI, ATMAN
name: BELLARBI, LARBI
Publisher: name: Educational Journal of the University of Patras UNESCO Chair
Year: 2014
Subjects: Digital signal Processing, Simulation Block, pedagogical sequence, conceptual model

description: The integration of software tools in education has demonstrated sufficient effectiveness in assimilation process, of concepts and formulas relatively difficult to understand by a written or oral description, in all fields of science and technology. In this work, we propose the use of simulation blocks developed in Matlab tool in the teaching of digital signal processing in general, and analyzing a nonrecursive digital filter as practical case study. Then we discuss the organization of a library of blocks shared between teachers in the different sequences of the course.
description: Educational Journal of the University of Patras UNESCO Chair, Vol. 1, N. 2 (2014) - Colloque SIEST Méditerranée, Rabat 2014
title: Poa alpina
title: Alpen-Rispengras (Poa alpina)
titleType: AlternativeTitle
Creators: name: Schulz, Herbert
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2006
Subjects: subject: Diasammlung Herbert Schulz
subject: 580

description: Enthält 6 Bilder des Alpen-Rispengrases.
FORMATION AND DISSOCIATION OF CO2 AND CO2 – THF HYDRATES COMPARED TO CH4 AND CH4 - THF HYDRATES
Creators: name: Giavarini, Carlo
name: Maccioni, Filippo
name: Broggi, Alessandra
name: Politi, Monia
Publisher: name: The University of British Columbia
Year: 2008

description: This work is part of a research project sponsored by the Italian Electricity Agency for CO2 disposal in form of hydrate. The dissociation behavior of CH4 hydrate was taken as a reference for the study of the CO2 hydrate preservation. The formation and dissociation of CO2 and CO2–THF mixed hydrates, compared to CH4 and CH4 – THF mixed hydrates, has been considered. The experimental tests were performed in a 2 liter reaction calorimeter at pressures between 0.1 and 0.3 MPa. The dissociation has been followed at temperatures from -3 °C to 0 °C for CO2 and CH4 hydrates, and from -3 °C to 10 °C for THF mixed hydrates. More than pressure, which is very important for methane hydrates, temperature affects the preservation of CO2 and CO2–THF mixed hydrates. Subcooling after formation is important for methane hydrate preservation, but it does not substantially affect CO2 hydrate stability. In the studied P, T range, CO2 hydrate does not present any anomalous self-preservation effect. The mixtures containing more ice show a slower dissociation rate. Methane hydrate requires less energy to dissociate than CO2 hydrate and, therefore, is less stable. On the contrary, the mixed CO2 – THF hydrates are less stable than the mixed methane hydrates. Modulated differential scanning calorimetry (MDSC) has been used for hydrate characterization: both CH4 and CO2 hydrates include two decomposition peaks, the first due to the melting of the ice and the second to the decomposition of the hydrate. The higher temperature of the decomposition peak of CO2 hydrate confirms its higher stability respect to CH4 hydrate.
Information Measures in Detecting and Recognizing Symmetries
Creators: name: Popel, Denis V.
Publisher: name: arXiv
Year: 2002
Subjects: subject: Other Computer Science (cs.OH)
subject: FOS: Computer and information sciences
subject: B.6.3

description: This paper presents a method to detect and recognize symmetries in Boolean functions. The idea is to use information theoretic measures of Boolean functions to detect sub-space of possible symmetric variables. Coupled with the new techniques of efficient estimations of information measures on Binary Decision Diagrams (BDDs) we obtain promised results in symmetries detection for large-scale functions.
description: 4 pages, 2 figures, 2 tables, MWSCAS'01
title: Poa pratensis
title: Wiesen-Rispengras (Poa pratensis)
titleType: AlternativeTitle
Creators: name: Schulz, Herbert
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2006
Subjects: subject: Diasammlung Herbert Schulz
subject: 580

description: Enthält 4 Bilder des Wiesen-Rispengrases.
Exact Lower Bounds for Monochromatic Schur Triples and Generalizations
Creators: name: Koutschan, Christoph
name: Wong, Elaine
Publisher: name: arXiv
Year: 2019
Subjects: subject: Combinatorics (math.CO)
subject: Symbolic Computation (cs.SC)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We derive exact and sharp lower bounds for the number of monochromatic generalized Schur triples $(x,y,x+ay)$ whose entries are from the set $\{1,\dots,n\}$, subject to a coloring with two different colors. Previously, only asymptotic formulas for such bounds were known, and only for $a\in\mathbb{N}$. Using symbolic computation techniques, these results are extended here to arbitrary $a\in\mathbb{R}$. Furthermore, we give exact formulas for the minimum number of monochromatic Schur triples for $a=1,2,3,4$, and briefly discuss the case $0
description: 24 Pages
Option Pricing using Quantum Computers
Creators: name: Stamatopoulos, Nikitas
name: Egger, Daniel J.
name: Sun, Yue
name: Zoufal, Christa
name: Iten, Raban
name: Shen, Ning
name: Woerner, Stefan
Publisher: name: arXiv
Year: 2019
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a methodology to price options and portfolios of options on a gate-based quantum computer using amplitude estimation, an algorithm which provides a quadratic speedup compared to classical Monte Carlo methods. The options that we cover include vanilla options, multi-asset options and path-dependent options such as barrier options. We put an emphasis on the implementation of the quantum circuits required to build the input states and operators needed by amplitude estimation to price the different option types. Additionally, we show simulation results to highlight how the circuits that we implement price the different option contracts. Finally, we examine the performance of option pricing circuits on quantum hardware using the IBM Q Tokyo quantum device. We employ a simple, yet effective, error mitigation scheme that allows us to significantly reduce the errors arising from noisy two-qubit gates.
description: Fixed a typo. This article has been accepted in Quantum
Dissipative Chaos in Semiconductor Superlattices
Creators: name: Alekseev, Kirill N.
name: Berman, Gennady P.
name: Campbell, David K.
name: Cannon, Ethan H.
name: Cargo, Matthew C.
Publisher: name: arXiv
Year: 1996
Subjects: subject: Condensed Matter (cond-mat)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We consider the motion of ballistic electrons in a miniband of a semiconductor superlattice (SSL) under the influence of an external, time-periodic electric field. We use the semi-classical balance-equation approach which incorporates elastic and inelastic scattering (as dissipation) and the self-consistent field generated by the electron motion. The coupling of electrons in the miniband to the self-consistent field produces a cooperative nonlinear oscillatory mode which, when interacting with the oscillatory external field and the intrinsic Bloch-type oscillatory mode, can lead to complicated dynamics, including dissipative chaos. For a range of values of the dissipation parameters we determine the regions in the amplitude-frequency plane of the external field in which chaos can occur. Our results suggest that for terahertz external fields of the amplitudes achieved by present-day free electron lasers, chaos may be observable in SSLs. We clarify the nature of this novel nonlinear dynamics in the superlattice-external field system by exploring analogies to the Dicke model of an ensemble of two-level atoms coupled with a resonant cavity field and to Josephson junctions.
description: 33 pages, 8 figures
Quelles pratiques didactiques à propos des formules trigonométriques à l’aune de la généralisation des TICE ?
Creators: name: BAHRA, MOHAMED
name: NAJOUA, AOUATIF
name: AAZIM, JALILA ACHOUAQ
Publisher: name: Educational Journal of the University of Patras UNESCO Chair
Year: 2014
Subjects: Teaching practices, trigonometric formulas, ICT

description: Via manipulation and structuring according to specific rules of the grouping of individual objects, pupils at primary school are introduced to calculation by means of their hands as well as the techniques of the four arithmetic operations. The language of arithmetic formulas is more or less well assimilated before they reach middle school. Nevertheless, the language of trigonometric formulas has not benefited from the same attention of teaching practices. It is as if the type of calculations favoured by these practices is the one that does not need to focus on some geometrical models. In this research investigation, we try to show how Information and Communication Technology (ICT) makes geometrical models available for pupils who are introduced to calculations in their school programs at an early age. These calculations have so far been intended only for pupils belonging to sections with more developed mathematical content, especially the calculation establishing the trigonometric formulas.
description: Educational Journal of the University of Patras UNESCO Chair, Vol. 2, N. 1 (2015) - Colloque SIEST Méditerranée, Rabat 2014
The Hopf Monoid of Orbit Polytopes
Creators: name: Supina, Mariel
Publisher: name: arXiv
Year: 2019
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05Exx, 16T30, 52Bxx (Primary), 20B30, 13F25 (Secondary)

description: Many families of combinatorial objects have a Hopf monoid structure. Aguiar and Ardila introduced the Hopf monoid of generalized permutahedra and showed that it contains various other notable combinatorial families as Hopf submonoids, including graphs, posets, and matroids. We introduce the Hopf monoid of orbit polytopes, which is generated by the generalized permutahedra that are invariant under the action of the symmetric group. We show that modulo normal equivalence, these polytopes are in bijection with integer compositions. We interpret the Hopf structure through this lens, and we show that applying the first Fock functor to this Hopf monoid gives a Hopf algebra of compositions. We describe the character group of the Hopf monoid of orbit polytopes in terms of noncommutative symmetric functions, and we give a combinatorial interpretation of the basic character and its polynomial invariant.
description: v2: Minor edits. Final version for Journal of Combinatorics. 21 pages, 5 figures
Essays on the Regulation and Remote Sensing of Natural Gas Flaring
Creators: Lee, Ruiwen
Publisher: name: Columbia University
Year: 2020
Subjects: Environmental economics
Remote sensing
Oil-shale industry--Environmental aspects
Waste gases--Combustion

description: Natural gas flaring from oil production is a pervasive yet understudied environmental issue. Recently available satellite imagery of gas flares has increased public awareness and concern over the severity and ubiquity of the problem. In the US, the relatively recent combination of hydraulic fracturing and horizontal drilling sparked the shale boom, leading to hundreds of thousands of wells being drilled within a decade, often in close proximity to residential populations. A major oil state that has emerged from the shale boom is North Dakota. In 2014, state regulators introduced a policy to limit the percentage of produced gas that oil-extracting companies are allowed to flare. Like many other places where flaring takes place, flared volumes are reported by oil companies themselves. What was the effect of North Dakota’s regulation on gas flaring according to self-reported and satellite data? What was the effect of the regulation on self-reporting behavior? In such a tight oil setting, how well does the prevailing satellite product used to monitor gas flares perform? This dissertation uses new data and methodologies from several disciplines to study these important questions around gas flaring. The results find that the predominant satellite product does not perform well in the on-shore oil production context. While regulation has reduced flaring in a major oil state, the reduction is smaller than thought because of underreporting by oil well operators. Further, the underreporting is associated with political economy and corporate culture factors.
title: Poa minor
title: Kleines Rispengras (Poa minor)
titleType: AlternativeTitle
Creators: name: Schulz, Herbert
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2006
Subjects: subject: Diasammlung Herbert Schulz
subject: 580

description: Enthält 2 Bilder des Kleinen Rispengrases.
title: Poa annua
title: Einjähriges Rispengras (Poa annua)
titleType: AlternativeTitle
Creators: name: Schulz, Herbert
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2006
Subjects: subject: Diasammlung Herbert Schulz
subject: 580

description: Enthält 3 Bilder des Einjährigen Rispengrases.
Some generalizations of the convective model of jet generation
Creators: name: Artekha, S. N.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: For analytical description of the initial stage of jet generation in nonequilibrium inhomogeneous plasma in the magnetohydrodynamic approximation, possible generalizations of solutions of the nonlinear equation for the stream function are analyzed. The jet generation model is based on the mechanism of convective instability and the frozen-in condition of magnetic field lines and is characterized by a number of free parameters. The equation for the radial part of the stream function is satisfied by first-order Bessel functions. To satisfy all the conditions near the jet axis and on its periphery, the found solutions are smoothly joined at the boundary. The final analytical solution for the velocity field is applicable to arbitrary values of dimensionless coordinates. The poloidal velocity increases approximately exponentially, and the azimuthal velocity - according to a superexponential law. In this paper, the velocity field of the jet, which consists of seven sections, is calculated. The rotation of the jet turns out to be differential, and to obtain a solution in quadratures for the azimuthal velocity, one can use not only linear but also power dependences on the altitude. For the exponent n < 1, a noticeable increase in the azimuthal velocity with radius is observed immediately from the jet axis, and for n > 1, a region of relative calm is observed near the axis. The jet model is generalized to the case of an arbitrary dependence of the Brunt-Väisälä frequency on the altitude. The corresponding solutions are found for the radial and vertical velocity components. For the initial stage of development, the vertical and azimuthal components of the generated magnetic field of the jet were also found in the work.
description: 12 pages, 5 figures
Le décloisonnement des disciplines scientifiques et technologiques au collège : quels effets sur les élèves ?
Creators: name: BARANES, VALÉRIE
name: CASTERA, JÉRÉMY
name: CHATONEY, MARJOLAINE
name: SAID, FATMA
Publisher: name: Educational Journal of the University of Patras UNESCO Chair
Year: 2014
Subjects: Integrated teaching, decompartmentalization of academic disciplines, science and technology

description: This research focuses on the necessary and contemporary mutation of science and technology education. More precisely, the recent decompartmentalization of the academic disciplines at school offers an appropriate observatory. Some studies have investigated the question of academic disciplines’ decompartmentalization and their integration in terms of content and concepts to be built. However, we don’t know much about the scientific and human feasibility, including those relating to access to knowledge by students but also those relating to the possibility (capacity) of the teachers to think science and technology outside their academic discipline view. Recently, an integrated science and technology education has been set up experimentally with voluntary school teachers. What do students think about this new teaching approach? Does it match with their expectations? What are their relationships with science and technology? To answer these questions a questionnaire has been submitted (girls and boys) to middle and high school students who received these experimental courses in science and technology.
description: Educational Journal of the University of Patras UNESCO Chair, Vol. 2, N. 1 (2015) - Colloque SIEST Méditerranée, Rabat 2014
Response of soil organic C fractions and enzyme activity to integrating N fertilisation with cotton stalk or its biochar in a drip-irrigated cotton field
Creators: name: Ma, Lijuan
name: Min, Wei
name: Guo, Huijuan
name: Li, Qi
name: Xu, Wenxia
name: Hou, Zhenan
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Space Science
subject: Microbiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Plant Biology

description: The objective of this study was to investigate the effect of nitrogen (N) application combined with cotton stalk or its biochar on soil organic carbon (SOC) fractions and enzyme activity. The field experiment was conducted over three cropping seasons with three organic C treatments and three N application rates. Three organic C treatments were set as no organic C amended (CK), cotton stalk (ST), cotton stalk biochar (BC). Three N applied at rates of 0, 300, and 450 kg N ha−1 (N0, N300, and N450, respectively). Results showed that N fertilisation alone reduced dissolved organic C (DOC) and N450 reduced easily oxidisable organic C (EOC) in 2015–2016. Microbial biomass C (MBC) basal soil respiration (BSR), β-glucosidase activity (BG), and N-acetyl-glucosaminidase activity (NAG) activity in N450 were greater than in N0. On average, SOC was 13.4% −36.6% greater in ST and 23.7–59.2% greater in BC than that in CK. ST and BC increased soil organic C fractions, MBC and non-labile organic C (non-LOC) were greater in BC than in ST. BC decreased soil DOC/TOC, EOC/TOC ratios, increased soil non-LOC/TOC ratio and cotton yield, ST increased the ratios of labile C and enzymes activity in soil. Therefore, integrating 300 kg ha−1 N fertilisation with biochar is an optimising management strategy to promote C sequestration and sustain the crop productivity in a drip-irrigated cotton field.
title: Improving the Utility of the Tower of London, a Neuropsychological Test of Planning
Creators: name: Tunstall, Jennifer
Publisher: name: Griffith University
Year: 1999
Subjects: subject: Tower of London
subject: Executive function
subject: Psychological tests
subject: Personality assessment
subject: Planning
subject: Neuropsychology
subject: Psychology
subject: FOS: Psychology

description: The utility of a popular test of planning, the Tower of London (TOL), was improved by addressing its limitations. The ceiling effect of the most commonly used version was removed by modifying the materials to increase item difficulty. To improve reliability, psychometric criteria were used to select the test items. An initial pool of 33 problems was administered to 65 children (M = 6.92 years, SD = 1.08) and 73 adults (M = 43.62 years, SD = 19.96) to derive 11 items of graded difficulty and maximal item discrimination. When these items were administered to 33 undergraduates (M = 26.10 years, SD = 9.79), the single item which did not retain its difficulty level was removed. Although low, the internal consistency in this sample (split-half r = .39) was higher than that of the TOL (Cronbach's alpha = .30) which was administered to 23 undergraduates (M = 25.61 years, SD = 8.69). Normative data for the modified version (the TOL4) were collected for a total of 447 people aged between 5 and 53 years. The split-half reliability in this sample was acceptable (r = .60), as was the 1-month test-retest reliability of .71 for a sample of 61 adults and children (M = 26.08 years, SD = 13.98). Although there was a slight practice effect, F(1,60) = 6.80, p = .01, the improvement was not clinically important (Mtime1 = 20.59, SD = 4.34; Mtime2 = 21.49, SD = 3.16). The construct validity of the total score as a measure of planning was demonstrated in three ways. First, the developmental improvement in the normative sample was consistent with both cognitive theory and previous research with the TOL. Second, in a sample of 73 undergraduates (M = 24.77 years, SD = 8.39) the total score correlated with measures of planning (Tinkertoy Test, r = .28, p < .05; Porteus Mazes; r = -.27, p < .05), but not with measures of other abilities, such as concept formation, verbal fluency, switching and memory. Finally, in a principal components analysis with the same sample, the total score loaded with a measure from the Porteus Mazes on a Planning component. In contrast, the planning time measure had a different developmental trajectory and different correlations. It appeared to measure response inhibition and the speed of encoding and conceptualising problems. The results of this study have several implications for improving the assessment of planning in both clinical and experimental contexts. Most important, users can be confident that the TOL4 accurately measures aspects of planning ability, is suitable for repeated administrations with the same client, and is applicable across a wide age range. Additional research to extend the norms to older adults and to evaluate criterion-related validity would further improve the utility of the TOL4.
Tensor product representations of the quantum double of a compact group
Creators: name: Koornwinder, T. H.
name: Bais, F. A.
name: Muller, N. M.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 22D20, 22D30 (Primary); 81R50 (secondary)

description: We consider the quantum double D(G) of a compact group G, following an earlier paper. We use the explicit comultiplication on D(G) in order to build tensor products of irreducible *-representations. Then we study their behaviour under the action of the R-matrix, and their decomposition into irreducible *-representations. The example of D(SU(2)) is treated in detail, with explicit formulas for direct integral decomposition (`Clebsch-Gordan series') and Clebsch-Gordan coefficients. We point out possible physical applications.
description: LaTeX2e, 27 pages, corrected references, accepted by Comm.Math.Phys
Essays on the use of computational linguistics in marketing
Creators: Lemaire, Alain Philippe
Publisher: name: Columbia University
Year: 2020
Subjects: subject: Marketing
subject: FOS: Economics and business
subject: Computational linguistics
subject: Loans
subject: Bayesian statistical decision theory--Data processing
subject: Default (Finance)
subject: Truthfulness and falsehood
subject: Reviews

description: This thesis explores the use of unstructured data, and specifically textual data, in providing consumer insights and improving business decisions. The thesis consists of two essays. In essay I, I examine how the linguistic similarity between the language used by reviewers of a product and a prospective customer’s own writing style can be leveraged to assess the match between customers and products. Applying tools from machine learning, Bayesian statistics, and computational linguistics to a large-scale dataset from Yelp, I find that the closer the writing style of a restaurant’s past reviews are to a prospective customer’s writing style, the more likely that customer is to write a review for that restaurant. This effect holds across restaurant types and is driven by the linguistic similarity between the customer’s own reviews and positive past reviews for the restaurant. Further, I find that similarity with respect to words related to leisure (e.g., family, wine, beer, weekend), biology (e.g., eat, life, love), as well as swear words are most influential in creating a match between customers and restaurants. In essay II, I examine whether borrowers consciously or not, leave traces of their intentions, circumstances, and personality traits in the text they write when applying for a loan. I find that this textual information has a substantial and significant ability to predict whether borrowers will pay back the loan above and beyond the financial and demographic variables commonly used in models predicting default. Using text-mining and machine-learning tools to automatically process and analyze the raw text in over 120 thousand loan requests from Prosper.com, an online crowdfunding platform, I find that including the textual information in the loan significantly helps predict loan default and can have substantial financial implications. I find that loan requests written by defaulting borrowers are more likely to include words related to their family, mentions of God, the borrower’s financial and general hardship, pleading lenders for help, and short-term focused words. I further observe that defaulting loan requests are written in a manner consistent with the writing style of extroverts and liars.
Essays on the Social Impacts of Climate
Creators: Hsiang, Solomon M.
Publisher: name: Columbia University
Year: 2011
Subjects: Sustainability
Economics
Climatic changes

description: It has been hypothesized that local or global climatic conditions can affect societies in a variety of ways.  However, to date, it has been difficult to measure the social impact of climate, so the scale and scope of its influence on populations remains mostly theoretical.  This dissertation integrates data and quantitative methods from climate science, economics and political science to develop new techniques for empirically measuring the the social impacts of climate. These techniques are used to measure large-scale dynamical relationships between climatological conditions and the response of the societies that are exposed to them. In general, the response of societies to climatological forcing is found to be larger than previously thought. The concluding chapter discusses how these findings may inform policies that govern the global environment and economic development.