cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Pebble accretion in class 0/I YSOs as a possible pathway for early planet formation
Creators: name: Tanaka, Yuki A.
name: Tsukamoto, Yusuke
Publisher: name: arXiv
Year: 2019
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Recent theoretical works suggest that the pebble accretion process is important for planet formation in protoplanetary disks, because it accelerates the growth of planetary cores. While several observations reveal axisymmetric sharp gaps in very young disks, which may be indicative of the existence of planets. We investigate the possibility of planet formation via pebble accretion in much earlier phases, the gravitationally unstable disks of class 0/I young stellar objects. We find that under the conditions of the class 0/I disks, the pebble accretion timescales can be shorter compared to the typical protoplanetary disks due to larger gas and dust accretion rate, but also find that the accretion timescale is not always a decreasing function of the gas accretion rate. By using estimated accretion timescales, we give a required initial mass to form cores of gas giants within the lifetime of class 0/I phases under several parameters, such as radial distances from the host star, gas accretion rates, and dust-to-gas mass ratio. In the most optimistic case, for example the dust-to-gas mass ratio is $f=3f_{\rm solar}$, $\sim10^{-4}M_{\oplus}$ objects at 10 au can grow to $10M_{\oplus}$ cores during the typical lifetime of the class 0/I phases, 0.5 Myr.
description: 15 pages, 10 figures, accepted for publication in MNRAS
L’appréhension du concept de modèle en physique : étude de cas en classe de première année secondaire sur l’interprétation des phénomènes électrostatiques
Creators: name: CHABREK, FEHRI
name: RASSAA, KAOUTHER
name: BEN KILANI, CHIRAZ
Publisher: name: Mediterranean Journal of Education
Year: 2023
Subjects: Teaching practices, double didactic and ergonomic approach, theory of the two worlds, electrostatics, models

description: This research aimed to analyze and understand the teaching practices of a physics teacher during an ordinary teaching session on the interpretation of electrostatic phenomena (first-year secondary class, 15-16-year-old pupils). The double didactic and ergonomic approach (DADE) is used to analyze the data collected (class videos and semi-directive interviews). The results show that the personal dimension drives the teacher's activity concerning models when teaching the interpretation of electrostatic phenomena.
description: Mediterranean Journal of Education, Vol. 3, N. 2 (2023) - Colloque SIEST Méditerranée 8, Tunisia
The determinants of CO2 emissions in MENA countries: a responsiveness scores approach
Creators: name: C. Magazzino
name: G. Cerulli
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Science Policy

description: This paper examines the relationship among carbon dioxide (CO2) emissions, GDP, and energy in the Middle East and North Africa (MENA) countries by using a Responsiveness Scores (RS) approach. Empirical results over the period 1971–2013 suggest that GDP per capita and energy consumption show positive RSs, while trade and urban population negative ones. Moreover, energy consumption and urban population reveal moderate increasing returns to scale, while GDP per capita exhibits decreasing positive returns. Furthermore, three-way factors analysis sets out that most of the countries lays on regions with moderate negative Total Responsiveness Scores (TRS). This means that when all factors are jointly increased, CO2 emissions have a moderate decrease. In addition, some GCC countries present a different pattern compared to the average pattern of MENA countries. Finally, radar plots indicate that, overall, RS pattern over factors is moderately heterogeneous within GCC countries, with larger variability appearing in the response to urban population and GDP.
title: Simulation and Automatic Planning of 300 GHz Backhaul Links
Creators: name: Jung, Bo
name: Dreyer, Nils
name: Eckhardt, Johannes
name: Kürner, Thomas
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2019
Subjects: subject: 621.3

description: The IEEE Standard 802.15.3d defines a
communication systems allowing wireless solutions for backhaul
links operating at 300 GHz with data rates of 100 Gbit/s and
beyond. The European Horizon 2020 ThoR project works
towards the demonstration of such a solution. One of the goals of
ThoR is to develop algorithms for automatic planning of
300 GHz backhaul links and the derivation of planning
guidelines. In this paper, an automatic algorithm for the planning
of 300 GHz backhaul links using 3D ray tracing taking into
account atmospheric effects is presented. The influence of both
the applied antennas and the weather conditions are evaluated
for an automatically planned network by using a realistic
scenario of an ultra-dense network in the city of Hannover.
Usage d’exemples en physique dans l’enseignement universitaire et déterminants du métier de l’enseignant
Creators: name: KOUAS, MONGI
name: BOULABIAR, AHLEM
name: BEN KILANI, CHIRAZ
name: BOILEVIN, JEAN-MARIE
Publisher: name: Mediterranean Journal of Education
Year: 2023
Subjects: Use of examples, university teacher, materiel point kinematics, dual didactic and ergonomic approach, determinants of the profession

description: Our research focuses on the use of examples by a Tunisian university physics teacher in a material point kinematics course for a first-year class of fundamental degree in physics. We use the dual didactic and ergonomic approach in physics to explore the use of examples by the teacher during the course. We find that different determinants of the profession weigh on the choices and the way to mobilize these examples.
description: Mediterranean Journal of Education, Vol. 3, N. 2 (2023) - Colloque SIEST Méditerranée 8, Tunisia
Critical energy flux and mass in solvable theories of 2d dilaton gravity
Creators: name: Fabbri, A.
name: Navarro-Salas, J.
Publisher: name: arXiv
Year: 1998
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we address the issue of determining the semiclassical threshold for black hole formation in the context of a one-parameter family of theories which continuously interpolates between the RST and BPP models. We find that the results depend significantly on the initial static configuration of the spacetime geometry before the influx of matter is turned on. In some cases there is a critical energy density, given by the Hawking rate of evaporation, as well as a critical mass $m_{cr}$ (eventually vanishing). In others there is neither $m_{cr}$ nor a critical flux.
description: LaTeX file, 12 pages, 4 figures
Présentation d’un dispositif de formation non formelle à un public adulte non scolarisé fondé sur le cadre sémiotique de Peirce
Creators: name: MANAI, MONIA
name: RASSAA, KAOUTHER
name: BEN KILANI, CHIRAZ
Publisher: name: Mediterranean Journal of Education
Year: 2023
Subjects: Semiotics, distillation, non-formal adult education

description: This article presents an adult education approach named « semio didactic approach » subject of a collaborative research project initiated by DVV International, the German of international cooperation of German adult education association. This approach was tested as part of a non-formal training programme in the sustainable use of aromatic and medicinal plants for adults not attending school. The system, whose theoretical core is based on Charles Sanders Peirce's semiotic framework, enabled learners to construct a system of signs modelling the activity to be carried out.
description: Mediterranean Journal of Education, Vol. 3, N. 2 (2023) - Colloque SIEST Méditerranée 8, Tunisia
From local to global deformation quantization of Poisson manifolds
Creators: name: Cattaneo, Alberto S.
name: Felder, Giovanni
name: Tomassini, Lorenzo
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We give an explicit construction of a deformation quantization of the algebra of functions on a Poisson manifolds, based on Kontsevich's local formula. The deformed algebra of functions is realized as the algebra of horizontal sections of a vector bundle with flat connection.
description: 16 pages. Reference and dedication added. Sign corrected, remark on Poisson vector fields added
Special Relativistic Magnetohydrodynamics with Gravitation
Creators: name: Noh, Hyerim
name: Hwang, Jai-chan
name: Bucher, Martin
Publisher: name: arXiv
Year: 2018
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a fully nonlinear and exact perturbation formulation of Einstein's gravity with a general fluid and the ideal magnetohydrodynamics (MHD) without imposing the slicing (temporal gauge) condition. Using this formulation, we derive equations of special relativistic (SR) MHD in the presence of weak gravitation. The equations are consistently derived in the limit of weak gravity and action-at-a-distance in the maximal slicing. We show that in this approximation the relativistic nature of gravity does not affect the SR MHD dynamics, but SR effects manifest themselves in the metric, and thus gravitational lensing. Neglecting these SR effects may lead to an overestimation of lensing masses.
description: 10 pages, no figure
Deep Network Embedding for Graph Representation Learning in Signed Networks
Creators: name: Shen, Xiao
name: Chung, Fu-Lai
Publisher: name: arXiv
Year: 2019
Subjects: subject: Social and Information Networks (cs.SI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Network embedding has attracted an increasing attention over the past few years. As an effective approach to solve graph mining problems, network embedding aims to learn a low-dimensional feature vector representation for each node of a given network. The vast majority of existing network embedding algorithms, however, are only designed for unsigned networks, and the signed networks containing both positive and negative links, have pretty distinct properties from the unsigned counterpart. In this paper, we propose a deep network embedding model to learn the low-dimensional node vector representations with structural balance preservation for the signed networks. The model employs a semi-supervised stacked auto-encoder to reconstruct the adjacency connections of a given signed network. As the adjacency connections are overwhelmingly positive in the real-world signed networks, we impose a larger penalty to make the auto-encoder focus more on reconstructing the scarce negative links than the abundant positive links. In addition, to preserve the structural balance property of signed networks, we design the pairwise constraints to make the positively connected nodes much closer than the negatively connected nodes in the embedding space. Based on the network representations learned by the proposed model, we conduct link sign prediction and community detection in signed networks. Extensive experimental results in real-world datasets demonstrate the superiority of the proposed model over the state-of-the-art network embedding algorithms for graph representation learning in signed networks.
Surface tension-driven convection patterns in two liquid layers
Creators: name: Juel, Anne
name: Burgess, John M.
name: McCormick, W. D.
name: Swift, J. B.
name: Swinney, Harry L.
Publisher: name: arXiv
Year: 1999
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Two superposed liquid layers display a variety of convective phenomena that are inaccessible in the traditional system where the upper layer is a gas. We consider several pairs of immiscible liquids. Once the liquids have been selected, the applied temperature difference and the depths of the layers are the only independent control parameters. Using a perfluorinated hydrocarbon and silicone oil system, we have made the first experimental observation of convection with the top plate hotter than the lower plate. Since the system is stably stratified, this convective flow is solely due to thermocapillary forces. We also have found oscillatory convection at onset in an acetonitrile and n-hexane system heated from below.
description: 24 pages, 17 figures, submitted for the the special issue of Physica D to be entitled "Bifurcations, Patterns and Symmetry: selected papers dedicated to the memory of John David Crawford"
Additional file 1: of Neutrophils are a main source of circulating suPAR predicting outcome in critical illness
Creators: name: Gussen, Hendrik
name: Hohlstein, Philipp
name: Bartneck, Matthias
name: Warzecha, Klaudia
name: Buendgens, Lukas
name: Luedde, Tom
name: Trautwein, Christian
name: Koch, Alexander
name: Tacke, Frank
Publisher: name: figshare
Year: 2019
Subjects: subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Developmental Biology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Figure S1. Expression of CD87 on neutrophils. (DOCX 99 kb)
Additional file 3: of Key concepts in childrenâ s footwear research: a scoping review focusing on therapeutic footwear
Creators: name: Hill, Matthew
name: Healy, Aoife
name: Nachiappan Chockalingam
Publisher: name: figshare
Year: 2019
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy

description: Results of individual sources of evidence. Description of data: Full alphabetical listing by author of all included studies in the current scoping review and the charted data characteristics for each study. (DOC 365 kb)
Undergraduate research opportunities
Creators: name: Embree, Sonja
Publisher: name: The University of British Columbia
Year: 2010

description: Surfacing UBC Scholarship: Panel Presentation and Discussion – This panel presentation is about the promotion and dissemination of undergraduate student research through digital archiving. In collaboration with cIRcle, students in the MURP program are required to attend a workshop on publishing and copyright and deposit their final projects in cIRcle. This session took place on October 21, 2009 in the Dodson Room of the Irving K. Barber Learning Centre at the University of British Columbia.
Resonant electronic-bridge excitation of the U-235 nuclear transition in ions with chaotic spectra
Creators: name: Berengut, J. C.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Electronic bridge excitation of the 76 eV nuclear isomeric state in $^{235}$U is shown to be strongly enhanced in the U$^{7+}$ ion, potentially enabling laser excitation of this nucleus. This is because the electronic spectrum has a very high level density near the nuclear transition energy that ensures the resonance condition is fulfilled. We present a quantum statistical theory based on many-body quantum chaos to demonstrate that typical values for the electronic factor increase the probability of electronic bridge in $^{235}$U$^{7+}$ by many orders of magnitude. We also extract the nuclear matrix element by considering internal conversion from neutral uranium. The final electronic bridge rate is comparable to the rate of the Yb$^+$ octupole transition currently used in precision spectroscopy.
description: Accepted to Phys. Rev. Lett
A note on limits of sequences of binary trees
Creators: name: Grübel, Rudolf
Publisher: name: arXiv
Year: 2023
Subjects: subject: Combinatorics (math.CO)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 05C05, 60C05, 68W40

description: We discuss a notion of convergence for binary trees that is based on subtree sizes. In analogy to recent developments in the theory of graphs, posets and permutations we investigate some general aspects of the topology, such as a characterization of the set of possible limits and its structure as a metric space. For random trees the subtree size topology arises in the context of algorithms for searching and sorting when applied to random input, resulting in a sequence of nested trees. For these we obtain a structural result based on a local version of exchangeability. This in turn leads to a central limit theorem, with possibly mixed asymptotic normality.
description: Journal version
Training manual for RoB 2 risk of bias assessment in COVID-19 trials eligible for the COVID-19 living network meta-analysis
Creators: name: Nejstgaard, Camilla Hansen
name: Fabbri, Alice
name: Hróbjartsson, Asbjørn
Publisher: name: Zenodo
Year: 2021

description: This manual provides a training kit for assessing risk of bias (using RoB 2) in COVID-19 trials. It is intended for a person preparing for conducting the risk of bias assessment of a COVID-19 trial eligible for the living systematic review of COVID-19 trials.
Proper Time Dynamics in General Relativity and Conformal Unified Theory
Creators: name: Gyngazov, L. N.
name: Pawlowski, M.
name: Pervushin, V. N.
name: Smirichinski, V. I.
Publisher: name: arXiv
Year: 1998
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The paper is devoted to the description a measurable time-interval (``proper time'') in the Hamiltonian version of general relativity with the Dirac-ADM metric. To separate the dynamical parameter of evolution from the space metric we use the Lichnerowicz conformally invariant variables. In terms of these variables GR is equivalent to the conformally invariant Penrose-Chernicov-Tagirov theory of a scalar field the role of which is played by the scale factor multiplied on the Planck constant. Identification of this scalar field with the modulus of the Higgs field in the standard model of electroweak and strong interactions allows us to formulate an example of conformally invariant unified theory where the vacuum averaging of the scalar field is determined by cosmological integrals of motion of the Universe evolution.
description: 20 pages, latex, no figures, submited to General Relativity and Garvitation
title: Building an end user focused THz based ultra high bandwidth wireless access network: The TERAPOD approach
Creators: name: Davy, Alan
name: Pessoa, Luis
name: Renaud, Cyril
name: Wasige, Edward
name: Naftaly, Mira
name: Kurner, Thomas
name: George, Glenn
name: Cojocari, Oleg
name: Mahony, Niamh O'
name: Porcel, Marco A. G.
Publisher: name: IEEE
Year: 2017
Subjects: subject: Terahertz Communication, Resonance Tunnelling Diodes, Uni-travelling Carrier PhotoDiode, Skotky Barrier Diode, Standardisation
subject: 621.3

description: The TERAPOD project aims to investigate and
demonstrate the feasibility of ultra high bandwidth wireless
access networks operating in the Terahertz (THz) band. The
proposed TERAPOD THz communication system will be developed,
driven by end user usage scenario requirements and will
be demonstrated within a first adopter operational setting of a
Data Centre. In this article, we define the full communications
stack approach that will be taken in TERAPOD, highlighting the
specific challenges and aimed innovations that are targeted.
Revealing Strong Plasmon-Exciton Coupling Between Nano-gap Resonators and Two-Dimensional Semiconductors at Ambient Conditions
Creators: name: Qin, Jian
name: Zhang, Zhepeng
name: Chen, Yu-Hui
name: Zhang, Yanfeng
name: Blaikie, Richard
name: Ding, Boyang
name: Qiu, Min
Publisher: name: arXiv
Year: 2018
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Strong coupling of two-dimensional semiconductor excitons with plasmonic resonators enables control of light-matter interaction at the subwavelength scale. Here we develop strong coupling in plasmonic nano-gap resonators that allow modification of exciton number contributing to the coupling. Using this system, we not only demonstrate a large vacuum Rabi splitting up to 163 meV and splitting features in photoluminescence spectra, but also reveal that the exciton number can be reduced down to single-digit level (N<10), which is an order lower than that of traditional systems, close to single-exciton based strong coupling. In addition, we prove that the strong coupling process is not affected by the large exciton coherence size that was previously believed to be detrimental to the formation of plasmon-exciton interaction. Our work provides a deeper understanding of storng coupling in two-dimensional semiconductors, paving the way for room temperature quantum optics applications.
Stability boundaries of roll and square convection in binary fluid mixtures with positive separation ratio
Creators: name: Huke, B.
name: Lücke, M.
name: Büchel, P.
name: Jung, Ch.
Publisher: name: arXiv
Year: 1999
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Rayleigh-Bénard convection in horizontal layers of binary fluid mixtures heated from below with realistic horizontal boundary conditions is studied theoretically using multi-mode Galerkin expansions. For positive separation ratios the main difference between the mixtures and pure fluids lies in the existence of stable three dimensional patterns near onset in a wide range of the parameter space. We evaluated the stationary solutions of roll, crossroll, and square convection and we determined the location of the stability boundaries for many parameter combinations thereby obtaining the Busse balloon for roll and square patterns.
description: 19 pages + 15 figures, accepted by Journal of Fluid Mechanics
High Purity Single Photons Entangled with an Atomic Memory
Creators: name: Crocker, Clayton
name: Lichtman, Martin
name: Sosnova, Ksenia
name: Carter, Allison
name: Scarano, Sophia
name: Monroe, Christopher
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Trapped atomic ions are an ideal candidate for quantum network nodes, with long-lived identical qubit memories that can be locally entangled through their Coulomb interaction and remotely entangled through photonic channels. The integrity of this photonic interface is generally reliant on purity of single photons produced by the quantum memory. Here we demonstrate a single-photon source for quantum networking based on a trapped $^{138}\mbox{Ba}^+$ ion with a single photon purity of $ g^{2}(0)=(8.1\pm2.3)\times 10^{-5} $ without background subtraction. We further optimize the tradeoff between the photonic generation rate and the memory-photon entanglement fidelity for the case of polarization photonic qubits by tailoring the spatial mode of the collected light.
description: 5 pages
Additional file 2: of Key concepts in childrenâ s footwear research: a scoping review focusing on therapeutic footwear
Creators: name: Hill, Matthew
name: Healy, Aoife
name: Nachiappan Chockalingam
Publisher: name: figshare
Year: 2019
Subjects: subject: Biochemistry
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Developmental Biology
subject: Science Policy
subject: Computational Biology

description: Example of Medline (EBSCO) search strategy. Description of data: Medline database search strategy inclusive of Free text, MeSH and Boolean terms. (DOCX 12 kb)
An Enhanced Interleaving Frame Loss Concealment Method for Voice Over IP Network Services
Creators: name: Gueham, Tarek
name: Merazka, Fatiha
Publisher: name: arXiv
Year: 2019
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: This paper focuses on AMR WB G.722.2 speech codec, and discusses the unused bandwidth resources of the senders by using a Word16(16 bit) to encode the sent frames. A packet loss concealment (PLC) method for G.722.2 speech codec is proposed in order to overcome this problem and increases the efficiency of this codec by improving the quality of decoded speech under burst frame loss conditions over frame-switched networks. Objective and subjective experimental results confirm that our proposed algorithm could achieve better speech quality. Our proposed method achieves a PESQ value higher than 2 at 20% frame erasure rate and ensure the compatibility between our modified decoder and the non-modified G.722.2 coder.
description: 5 pages, 5 figures, conference
La citoyenneté émancipatrice un enjeu éducatif du curriculum tunisien ? Cas du cholestérol dans le curriculum des SVT
Creators: name: ZITOUNI, ABDELBAKI
Publisher: name: Mediterranean Journal of Education
Year: 2023
Subjects: Socially acute question, cholesterol, curriculum, citizenship education, emancipatory citizenship

description: In this research work we focus on the development of emancipatory citizenship an issue of Socially Acute Questions (SAQ) allowing the learner to analyze situations of societal debates and to face uncertainty. We start from the example of cholesterol as a schooling of a SAQ and we questioned the curriculum of the science of life and earth to ensure to what extent their designer are in favor of the promotion of emancipatory citizenship. The analysis of the corpus chosen allows us to affirm that the designers of the program of programs are in favor of the development of emancipatory citizenship while those of official life and earth science programs do not concretize this objective; they are rather oriented towards normative citizenship.
description: Mediterranean Journal of Education, Vol. 3, N. 2 (2023) - Colloque SIEST Méditerranée 8, Tunisia
Prepackaging Early California Potatoes at Point of Production
Creators: name: Chapogas, Peter G.
name: Hale, Philip W.
name: Chapogas, Peter G.
name: Hale, Philip W.
Publisher: name: Unknown
Year: 1960
Subjects: subject: Crop Production/Industries
subject: Labor and Human Capital
subject: Marketing
subject: FOS: Economics and business
subject: Production Economics
subject: Research and Development/Tech Change/Emerging Technologies

description: Excerpts from the report: The evaluation of paper and polyethylene bags for packaging California White Rose potatoes was begun during the spring of 1957. There has been an increasing demand from retailers for prepackaged potatoes. However, because the early varieties are generally more perishable than late varieties, the carrying qualities of the early varieties of potatoes packed in consumer bags and shipped to eastern markets were uncertain. The objectives of this study were to evaluate the advantages and disadvantages of packaging early White Rose potatoes at the point of production in two kinds of consumer packages: 10-pound paper bags and 10-pound polyethylene bags. Costs of packing materials, direct labor, and transportation, as well as the condition of the potatoes on arrival at terminal markets, were evaluated.
Quantum transport in a compensated semimetal W2As3 with nontrivial Z2 indices
Creators: name: Li, Yupeng
name: Xu, Chenchao
name: Shen, Mingsong
name: Wang, Jinhua
name: Yang, Xiaohui
name: Yang, Xiaojun
name: Zhu, Zengwei
name: Cao, Chao
name: Xu, Zhu-An
Publisher: name: arXiv
Year: 2018
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report a topological semimetal W2As3 with a space group C2/m. Based on the first-principles calculations, band crossings are partially gapped when spin-orbit coupling is included. The Z2 indices at the electron filling are [1;111], characterizing a strong topological insulator and topological surface states. From the magnetotransport measurements, nearly quadratic field dependence of magnetoresistance (MR) (B || [200]) at 3 K indicates an electron-hole compensated compound whose longitudinal MR reaches 115 at 3 K and 15 T. In addition, multiband features are detected from the high-magnetic-field Shubnikov-de Haas (SdH) oscillation, Hall resistivity, and band calculations. A nontrivial pi Berry's phase is obtained, suggesting the topological feature of this material. A two- band model can fit well the conductivity and Hall coefficient. Our experiments manifest that the transport properties of W2As3 are in good agreement with the theoretical calculations.
description: 8 pages, 5 figures
Note on geodesics of cotangent bundle with Berger-type deformed Sasaki metric over Kählerian manifold
Creators: name: Zagane, Abderrahim
Publisher: name: arXiv
Year: 2023
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C15, 53C22(Primary) 53C05, 53C55 (Secondary)

description: In this paper, first, we introduce the Berger-type deformed Sasaki metric on the cotangent bundle $T^{\ast}M$ over a Kählerian manifold $(M^{2m}, J, g)$ and investigate the Levi-Civita connection of this metric. Secondly, we present the unit cotangent bundle equipped with Berger-type deformed Sasaki metric, and we investigate the Levi-Civita connection. Finally, we study the geodesics on the cotangent bundle and on unit cotangent bundle with respect to the Berger-type deformed Sasaki metric.
Glossary of terms relating to thesauri and other forms of structured vocabulary for information retrieval
Creators: name: Will, Leonard
Publisher: name: Zenodo
Year: 2009
Subjects: subject: https://www.isko.org/kolit.php?cl=038

description: Confusion often arises when different people use terms to mean different things. In drawing up the following list I am grateful for suggestions and comments from three consultant colleagues who specialise in the development and use of thesauri and other forms of structured vocabulary for information retrieval: Stella Dextre Clarke, Alan Gilchrist and Ron Davies. I have tried as far as possible to maintain consistency with definitions which we drafted for the revised British standards for thesaurus construction (BS 8723:2005 Structured vocabularies for information retrieval) and have taken some account of the definitions in the USA national standard, Z39.19. I do not claim that these definitions are "correct" and that other meanings are "wrong", but I hope that they will be found to be a consistent and well-defined set which will aid communication by encouraging everyone to use the same words with the same meaning.
The NMR relaxation rate of O in undoped Sr_2CuO_2Cl_2: Probing two-dimensional magnons at short distances
Creators: name: Kopietz, Peter
name: Chakravarty, Sudip
Publisher: name: arXiv
Year: 1997
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We calculate the nuclear relaxation rate of oxygen in the undoped quasi two-dimensional quantum Heisenberg antiferromagnet Sr_2CuO_2Cl_2 above the Neel temperature. The calculation is performed at two-loop order with the help of the Dyson-Maleev formulation of the spin-wave expansion, taking all scattering processes involving two and three magnons into account. At low temperatures T we find 1 / T_1 = c_1 T^3 + c_2 T^4 + O (T^5), and give explicit expressions for the coefficients c_1 (two-magnon scattering) and c_2 (three magnon scattering). We compare our result with a recent experiment by Thurber et al. and show that this experiment directly probes the existence of short-wavelength magnons in a two-dimensional antiferromagnet.
description: Final version, to appear in Phys. Rev. B (1 August 1997)
title: Channel Sounding Techniques for Applications in THz Communications: A first correlation based channel sounder for ultra-wideband dynamic channel measurements at 300 GHz
Creators: name: Rey, Sebastian
name: Eckhardt, Johannes
name: Peng, Bile
name: Guan, Ke
name: Kürner, Thomas
Publisher: name: IEEE
Year: 2017
Subjects: subject: Submillimeter wave propagation, MIMO, Submillimeter wave measurements, radio propagation, THz communications
subject: 621.3

description: THz communications are a promising possibility to achieve data rates around and above 100 Gbit/s in the near future. Nevertheless, for every communication system the knowledge of the typical propagation characteristics is essential for each application scenario. In this paper, currently available channel sounding techniques are briefly reviewed in regard to the proposed applications for THz communications. Finally, a novel correlation-based channel sounder for 300 GHz is presented and evaluated according to the applications scenarios.
Analyse des erreurs langagières chez les élèves en arithmétique
Creators: name: SOLTANI, WALID
name: CHELLOUGUI, FAIZA
Publisher: name: Mediterranean Journal of Education
Year: 2024
Subjects: Mathematical language, arithmetic, mathematical induction, proof by cases, proof, syntactic, semantic

description: This article aims to contribute to a reflection on language difficulties among students. The main objective is to identify syntactic, semantic and mixed errors in the proofs produced by the 3rd year secondary school students in Mathematics section in Tunisia. This evidence produced in arithmetic requires one of the reasonings: mathematical induction or proof by cases. The analysis of the productions allowed us to identify a diversity of formulations most often not consistent with the syntactic and semantic scriptures of these two reasoning by these students.
description: Mediterranean Journal of Education, Vol. 3, N. 2 (2023) - Colloque SIEST Méditerranée 8, Tunisia
Dealing with the center and boundary problems in 1D Numerical Relativity
Creators: name: Arbona, A.
name: Bona, C.
Publisher: name: arXiv
Year: 1998
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Instabilities in finite difference codes due to the singularity of spherical coordinates at the center are studied. In typical Numerical Relativity applications, standard regularization techniques by themselves do not ensure long term stability. A proposal to remedy that problem is presented, which takes advantage of redundant quantities introduced in recent hyperbolic formulations of Einstein's evolution equations. The results are discussed through the example case of a boson star, where a significant improvement in the implementation of boundary conditions is also presented.
description: 10 pages, Latex, 1 postscript figure
Strain and Band-Gap Engineering in Ge-Sn Alloys via P Doping
Creators: name: Prucnal, Slawomir
name: Berencén, Yonder
name: Wang, Mao
name: Grenzer, Jörg
name: Voelskow, Matthias
name: Hübner, Rene
name: Yamamoto, Yuji
name: Scheit, Alexander
name: Bärwolf, Florian
name: Zviagin, Vitaly
name: Schmidt-Grund, Rüdiger
name: Grundmann, Marius
name: Żuk, Jerzy
name: Turek, Marcin
name: Droździel, Andrzej
name: Pyszniak, Krzysztof
name: Kudrawiec, Robert
name: Polak, Maciej P.
name: Rebohle, Lars
name: Skorupa, Wolfgang
name: Helm, Manfred
name: Zhou, Shengqiang
Publisher: name: arXiv
Year: 2019
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Ge with a quasi-direct band gap can be realized by strain engineering, alloying with Sn, or ultrahigh n-type doping. In this work, we use all three approaches together to fabricate direct-band-gap Ge-Sn alloys. The heavily doped n-type Ge-Sn is realized with CMOS-compatible nonequilibrium material processing. P is used to form highly doped n-type Ge-Sn layers and to modify the lattice parameter of P-doped Ge-Sn alloys. The strain engineering in heavily-P-doped Ge-Sn films is confirmed by x-ray diffraction and micro Raman spectroscopy. The change of the band gap in P-doped Ge-Sn alloy as a function of P concentration is theoretically predicted by density functional theory and experimentally verified by near-infrared spectroscopic ellipsometry. According to the shift of the absorption edge, it is shown that for an electron concentration greater than 1x10^20 cm-3 the band-gap renormalization is partially compensated by the Burstein-Moss effect. These results indicate that Ge-based materials have high potential for use in near-infrared optoelectronic devices, fully compatible with CMOS technology.
description: 20 pages, 6 figures
Effect of cooperative-based instruction strategies on business education students’ academic performance in principles of accounting
Creators: name: ADEMILUYI, LAWRENCE FEMI
name: EEBO, TIMOTHY OLUSEGUN
Publisher: name: Mediterranean Journal of Education
Year: 2024
Subjects: Academic performance, cooperative-based, lecture, instruction strategies

description: Performance of students in universities has been identified as a critical element of graduates’ survival regarding to various instruction strategies adopted. Cooperative-based and lecture instruction strategies were examined. Drawing differences between the two regarding the theoretical framework adopted in teaching, the role that is assigned to the lecturer during the activity and the actions that are expected from the students, the study aimed to serve 2 purposes with this research. Firstly, determine the effect of cooperative instruction strategy on Business Education students’ academic performance and effect of gender (male and female) on academic performance of Business Education students taught principles of accounting using cooperative and lecture instruction strategies. To achieve this purpose, a new instrument was developed. Secondly, to examine the instrument’s validity and reliability. The population of the study comprised 121 students from south-west Nigerian universities studying Business Education. Research findings suggest that cooperative-based instruction strategy had positive effect on academic performance of Business Education students in Principles of Accounting. It was recommended, among others, that relevant papers, journals and books and manuals should be produced by experts on effective usage of cooperative-based instruction strategy for academic improvement while students regardless of gender, should be exposed to cooperative-based instruction strategy for teaching Principles of Accounting. This is because the strategy is beneficial to both sexes.
description: Mediterranean Journal of Education, Vol. 4, N. 1 (2024)
Origin of Multikinks in Dispersive Nonlinear Systems
Creators: name: Champneys, Alan
name: Kivshar, Yuri S.
Publisher: name: arXiv
Year: 1999
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We develop {\em the first analytical theory of multikinks} for strongly {\em dispersive nonlinear systems}, considering the examples of the weakly discrete sine-Gordon model and the generalized Frenkel-Kontorova model with a piecewise parabolic potential. We reveal that there are no $2π$-kinks for this model, but there exist {\em discrete sets} of $2πN$-kinks for all N>1. We also show their bifurcation structure in driven damped systems.
description: 4 pages 5 figures. To appear in Phys Rev E
Introduction to Open Access and Connected Open Movements
Creators: name: Vessey, Mark
name: Kirchner, Joy
Publisher: name: The University of British Columbia
Year: 2016

description: This session provided an overview of open access and other related open movements such as open education, open science, open content and open data and explained why the principle of Openness is seen as a critical element in advancing the reach of research amongst students, scholars, universities, research funders worldwide. This session took place on October 18, 2010 in the Lillooet Room of the Irving K. Barber Learning Centre at the University of British Columbia.
To what extent is the criticism regarding the underestimation of emotions in transformation theory justified?
Creators: name: KARAKOU, MARIA
name: KARALIS, THANASSIS
Publisher: name: Mediterranean Journal of Education
Year: 2024
Subjects: Emotions, rational, transformation theory

description: This article presents the findings of a literature review conducted within the framework of a doctoral thesis. The findings highlight J. Mezirow's perspective on the role of emotions in Transformation Theory (TT) and also, the viewpoints of significant scholars in the field of Transformative Learning (TL) who raised objections regarding the emphasis Mezirow places on emotion, engaging in a dialogue with him. The ultimate goal is to critically answer the research question: “To what extent is the criticism that TT has received, regarding the underestimation of the emotional dimension of learning justified?”. The research initially demonstrated that Mezirow attributed significant importance to the role of emotions, linking it to all the fundamental elements of his framework. It also identified areas that require further exploration, such as proposals for specific techniques for eliciting and managing emotions in educational practice. Regarding the selected theorists, the literature review revealed three trends depending on how their approaches to emotion align or differentiate from Mezirow's positions. Based on the above findings, the research highlighted concerns regarding the compatibility of the proposed techniques with the field of Adult Education. Additionally, it raised questions about which of the mentioned theorists truly engage with Mezirow's work, aim to reconsider attention to it, and contribute creatively to its expansion.
description: Mediterranean Journal of Education, Vol. 4, N. 1 (2024)
Semantics of multimodal adjoint type theory
Creators: name: Shulman, Michael
Publisher: name: arXiv
Year: 2023
Subjects: subject: Category Theory (math.CT)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We show that contrary to appearances, Multimodal Type Theory (MTT) over a 2-category M can be interpreted in any M-shaped diagram of categories having, and functors preserving, M-sized limits, without the need for extra left adjoints. This is achieved by a construction called "co-dextrification" that co-freely adds left adjoints to any such diagram, which can then be used to interpret the "context lock" functors of MTT. Furthermore, if any of the functors in the diagram have right adjoints, these can also be internalized in type theory as negative modalities in the style of FitchTT. We introduce the name Multimodal Adjoint Type Theory (MATT) for the resulting combined general modal type theory. In particular, we can interpret MATT in any finite diagram of toposes and geometric morphisms, with positive modalities for inverse image functors and negative modalities for direct image functors.
description: 19 pages. v2: Improved notation; extended pre-proceedings version for MFPS 2023. v3: correct some mis-wordings, final. v4: condensed version for conference postproceedings
XMM-Newton observation of the Lockman Hole II. Spectral analysis
Creators: name: Mainieri, V.
name: Bergeron, J.
name: Hasinger, G.
name: Lehmann, I.
name: Rosati, P.
name: Schmidt, M.
name: Szokoly, G.
name: Della Ceca, R.
Publisher: name: arXiv
Year: 2002
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of the X-ray spectral analysis of the first deep X-ray survey with the XMM-Newton observatory during Performance Verification. We restrict the analysis to the sample of 98 sources with more than 70 net counts (flux limit in the [0.5-7] keV band of 1.6 10^{-15} erg cm^{-2} s^{-1}) of which 61 have redshift identification. We find no correlation between the spectral index Gamma and the intrinsic absorption column density N_H and, for both the Type-1 and Type-2 AGN populations, we obtain ~2. The progressive hardening of the mean X-ray source spectrum with decreasing flux is essentially due to an increase in intrinsic absorption. The marked separation between the two AGN populations in several diagnostics diagrams, involving X-ray colour, X-ray flux, optical/near IR colour and optical brightness, is also a consequence of different absorption column densities and enables the classification of optically faint obscured AGN. About 27% of the subsample with R-K' colour are EROs (R-K>5) and most of these 18 X-ray selected EROs contain anobscured AGN as revealed by their high X-ray-to-optical/near IR flux ratios. There are six sources in our sample with L_X[0.5-10]>10^44 erg s^{-1} and log(N_H)>10^22 cm^{-2}: which are likely Type-2 QSOs and we thus derive a density of ~69 objects of this class per square degree.
description: Accepted by Astronomy & Astrophysics, 15 pages, 10 figures
Réflexions d'enseignants de maternelle sur le numérique dans les activités scientifiques : transformations dues à la formation
Creators: name: ARUN, ZEBUN
name: ZACHARIS, GEORGIOS Κ.
Publisher: name: Mediterranean Journal of Education
Year: 2024
Subjects: Teacher training, kindergarten, Physical Sciences, Information and Communication Technologies in Education

description: This article presents a study of the ideas of preschool physical science teachers on the integration of the use of Information and Communication Technologies in Education and also on training in this field. This study is carried out on the basis of an interview and in the light of the framework of the didactics of the physical sciences, before and after the realization of a seminar on the use of new technologies in kindergarten teaching. The results of this survey showed that after the seminar, teachers changed their minds about the problems related to the use of ICT in schools and about the type of training they wanted to participate in.
description: Mediterranean Journal of Education, Vol. 4, N. 1 (2024)
Additional file 1: of Key concepts in childrenâ s footwear research: a scoping review focusing on therapeutic footwear
Creators: name: Hill, Matthew
name: Healy, Aoife
name: Nachiappan Chockalingam
Publisher: name: figshare
Year: 2019
Subjects: Medicine
Science Policy

description: File format: Preferred Reporting Items for Systematic reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) Checklist. Description of data: Checklist of the scoping review process for the current study against recommended guidelines. (DOCX 107 kb)
Operadic categories and décalage
Creators: name: Garner, Richard
name: Kock, Joachim
name: Weber, Mark
Publisher: name: arXiv
Year: 2018
Subjects: subject: Category Theory (math.CT)
subject: FOS: Mathematics

description: Batanin and Markl's operadic categories are categories in which each map is endowed with a finite collection of "abstract fibres" -- also objects of the same category -- subject to suitable axioms. We give a reconstruction of the data and axioms of operadic categories in terms of the décalage comonad D on small categories. A simple case involves unary operadic categories -- ones wherein each map has exactly one abstract fibre -- which are exhibited as categories which are, first of all, coalgebras for the comonad D, and, furthermore, algebras for the monad induced on the category of D-coalgebras by the forgetful-cofree adjunction. A similar description is found for general operadic categories arising out of a corresponding analysis that starts from a "modified décalage" comonad on the arrow category of Cat.
description: 20 pages