cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Synthesis and antioxidant screening of new 2-cyano-3-(1,3-diphenyl-1H-pyrazol-4-yl)acryloyl amide derivatives and some pyrazole-based heterocycles
Creators: name: Sallam, Hanan A.
name: Amna S. Elgubbi
name: El-Helw, Eman A. E.
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biochemistry
subject: Medicine
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences

description: The high functionality compound namely 2-cyano-3-(1,3-diphenyl-1H-pyrazol-4-yl)acryloyl chloride (1) was utilized as a building block synthon via reactions with some nitrogen and sulfur nucleophilic reagents. The present work was planned to study the effect of 2-cyano group on the reactivity and stability of C2–C3 double bond toward different strong-to-weak nucleophiles, in addition to its facility of nucleophilic addition at C2–C3 double bond to construct new heterocyclic derivatives. The proclivity toward some mono-, 1,2-, 1,3-, 1,4-, and 1,5-binucleophiles was investigated. The reaction with 2-cyanoacetohydrazide was mainly dependent on the reaction conditions. Some new heterocycles integrated with pyrazole scaffold were successfully synthesized, such as benzoxazinone, indoline, isoindoline, pyrazolone, chromene, and pyrimidopyrimidine derivatives. Some of the newly synthesized compounds were screened for their antioxidant activity using ABTS method, and the results revealed that some compounds exhibited promising inhibitory antioxidant activity.
Synthesis and structure of pyrido[1,2-a]quinazoline condensed derivatives
Creators: name: Olexii Yu. Voskoboinik
name: Stavytskyi, Viktor V.
name: Antypenko, Oleksii M.
name: Kazunin, Maksym S.
name: Kravtsov, Dmytro V.
name: Shishkina, Svetlana V.
name: Kovalenkoa, Sergiy I.
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biophysics
subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Molecular Biology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Present manuscript describes the synthesis and molecular structure features of novel condensed pyrido[1,2-a]quinazolines. The above-mentioned compounds were synthesized via condensation of 2-[azolyl-(аzinyl-)]anilines with 5-oxohexanoic acid. The tandem condensation intermediates were isolated and cyclized under various conditions. The structures of synthesized compounds were confirmed by LC-MS and NMR-spectroscopy. The existence of the substituted pyrido[1,2-a][1,2,4]triazolo[1,5-c]quinazolines molecules as superposition of two resonance structures was detected by the X-Ray analysis.
Does Food Aid Affect the Agricultural Sector? The Small Economy Case: Jamaica
Creators: name: Pemberton, Carlisle
name: Bezuneh, Mesfin
name: Patterson-Andrews, Hazel
name: Sormeaux, Afiya De
name: Pemberton, Carlisle
name: Bezuneh, Mesfin
name: Patterson-Andrews, Hazel
name: Sormeaux, Afiya De
Publisher: name: Unknown
Year: 2011
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Food Consumption/Nutrition/Food Safety
subject: food aid
subject: agricultural impact of food aid in Jamaica
subject: maize supply function

description: This paper looked at a small developing country, Jamaica and tried to determine whether food aid has had an effect on its agricultural sectorin particular the supply of maize by farmers, the price of maize and the imports of maize. In order to meet this objective, a simultaneous equation system of six equations was estimated. The results found that food aid had a negative and inelastic impact on maize production in Jamaica. Food aid however did not affect the price of maize or the import demand for cereals in Jamaica, contrary to major concerns about food aid to developing countries. The study also produced some interesting results such as tourist arrivals had a positive influence on GDP per capita in Jamaica and the highly elastic response of the domestic supply of maize to temperature. Thus the steady rise in temperature in Jamaica over the period 1970 to 2006 may have had a depressing effect on maize production especially with the more rapid rise in temperature since 1996. In general therefore the inelastic supply effects as well as the lack of impact on maize prices and import demand for cereals some measure of success in limiting the negative effects of food aid on the Jamaican agricultural sector.
The Arveson boundary of a Free Quadrilateral is given by a noncommutative variety
Creators: name: Evert, Eric
Publisher: name: arXiv
Year: 2020
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: Primary 47L07. Secondary 46L07, 90C05

description: Let $SM_n(\mathbb{R})^g$ denote $g$-tuples of $n \times n$ real symmetric matrices and set $SM(\mathbb{R})^g = \cup_n SM_n(\mathbb{R})^g$. A free quadrilateral is the collection of tuples $X \in SM(\mathbb{R})^2$ which have positive semidefinite evaluation on the linear equations defining a classical quadrilateral. Such a set is closed under a rich class of convex combinations called matrix convex combination. That is, given elements $X=(X_1, \dots, X_g) \in SM_{n_1}(\mathbb{R})^g$ and $Y=(Y_1, \dots, Y_g) \in SM_{n_2}(\mathbb{R})^g$ of a free quadrilateral $\mathcal{Q}$, one has \[ V_1^T X V_1+V_2^T Y V_2 \in \mathcal{Q} \] for any contractions $V_1:\mathbb{R}^n \to \mathbb{R}^{n_1}$ and $V_2:\mathbb{R}^n \to \mathbb{R}^{n_2}$ satisfying $V_1^T V_1+V_2^T V_2=I_n$. These matrix convex combinations are a natural analogue of convex combinations in the dimension free setting. A natural class of extreme point for free quadrilaterals is free extreme points: elements of a free quadrilateral which cannot be expressed as a nontrivial matrix convex combination of elements of the free quadrilateral. These free extreme points serve as the minimal set which recovers a free quadrilateral through matrix convex combinations. In this article we show that the set of free extreme points of a free quadrilateral is determined by the zero set of a collection of noncommutative polynomials. More precisely, given a free quadrilateral $\mathcal{Q}$, we construct noncommutative polynomials $p_1,p_2,p_3,p_4$ such that a tuple $X \in SM (\mathbb{R})^2$ is a free extreme point of a $\mathcal{Q}$ if and only if $X \in \mathcal{Q}$ and $p_i(X) =0 $ for $i=1,2,3,4$ and $X$ is irreducible. In addition we establish several basic results for projective maps of free spectrahedra and for homogeneous free spectrahedra.
description: 31 pages. Includes table of contents. An online appendix containing Mathematica notebooks which may be used to perform various computations described in the article is available at https://github.com/NCAlgebra/UserNCNotebooks/tree/master/Evert/FreeQuadrilaterals
Factors Influencing Agriculture’s Contribution to GDP:
Creators: name: De Sormeaux, Afiya
name: Pemberton, Carlisle
name: De Sormeaux, Afiya
name: Pemberton, Carlisle
Publisher: name: Unknown
Year: 2011
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Food Consumption/Nutrition/Food Safety
subject: International Relations/Trade
subject: Production Economics
subject: Latin America
subject: Caribbean
subject: agriculture
subject: GDP
subject: trade

description: This paper identifies the factors that influence agriculture’s percentage contribution to gross domestic (GDP) for a group of Latin American and Caribbean (LAC) countries that belong to the medium category of the UNDP Human Development Index (HDI). In line with theories of economic growth it was hypothesized that the percentage contribution of agriculture to GDP is influenced by factors associated with the level of economic development of the country and the degree of competitiveness of its agricultural sector. The analysis employed the use of a Random Effects panel regression model for a 30 year period (1980-2009) for the study countries. Based on the analysis, it was found that rural population, life expectancy, foreign direct investment, the rate of inflation, level of exports of all goods and services and the ratio of agricultural exports to agricultural imports significantly determined the percentage contribution of agriculture to GDP in the selected countries.
A six-octave optical frequency comb from a scalable few-cycle erbium fiber laser
Creators: name: Lesko, Daniel M. B.
name: Timmers, Henry
name: Xing, Sida
name: Kowligy, Abijith
name: Lind, Alexander J.
name: Diddams, Scott A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A compact and robust coherent laser light source that provides spectral coverage from the ultraviolet to infrared is desirable for numerous applications, including heterodyne super resolution imaging[1], broadband infrared microscopy[2], protein structure determination[3], and standoff atmospheric trace-gas detection[4]. Addressing these demanding measurement problems, laser frequency combs[5] combine user-defined spectral resolution with sub-femtosecond timing and waveform control to enable new modalities of high-resolution, high-speed, and broadband spectroscopy[6-9]. In this Letter we introduce a scalable source of near-single-cycle, 0.56 MW pulses generated from robust and low-noise erbium fiber (Er:fiber) technology, and we use it to generate a frequency comb that spans six octaves from the ultraviolet (350 nm) to mid-infrared (22500 nm). The high peak power allows us to exploit the second-order nonlinearities in infrared-transparent, nonlinear crystals (LiNbO$_3$, GaSe, and CSP) to provide a robust source of phase-stable infrared ultra-short pulses with simultaneous spectral brightness exceeding that of an infrared synchrotron[10]. Additional cascaded second-order nonlinearities in LiNbO$_3$ lead to comb generation with four octaves of simultaneous coverage (0.350 to 5.6 $μ$m). With a comb-tooth linewidth of 10 kHz at 193 THz, we realize a notable spectral resolving power exceeding 10$^{10}$ across 0.86 PHz of bandwidth. We anticipate that this compact and accessible technology will open new opportunities for multi-band precision spectroscopy, coherent microscopy, ultra-high sensitivity nanoscopy, astronomical spectroscopy, and precision carrier-envelope phase (CEP) stable strong field phenomena.
description: 6 pages, 5 figures. Nat. Photonics (2021)
Cesser de s’alimenter pour contraindre une autorité : la grève de la faim comme pratique protestataire
Creators: name: Lecarpentier, Damien
name: Lecarpentier, Damien
Publisher: name: Unknown
Year: 2006
Subjects: Food Consumption/Nutrition/Food Safety

description: Cet article est une contribution à l’étude de la grève de la faim comme forme de protestation et pose la question de la dynamique à l’œuvre dans cette forme d’action qui permet à un individu en situation de faiblesse stratégique d’exercer une force morale en cessant de s’alimenter. Après avoir rappelé les origines et le développement de cette pratique protestataire à travers le monde, l’article présente la grève de la faim comme une action combinant à la fois la dénonciation d’une injustice et un appel à la considération d’une situation ou d’une parole légitime jusque-là niée ou ignorée. Cette seconde dimension est importante à prendre en compte non seulement pour décrypter les situations qui amènent les individus à recourir à cette forme d’action, mais aussi pour saisir ce qui en fait la force. Par sa demande de réinsertion dans un espace commun d’écoute et de dialogue et en présentant l’autorité incriminée comme maître de l’issue de l’action, le gréviste parvient à impliquer cette autorité dans une épreuve morale que l’opinion publique est amenée à juger. À partir du cas de la grève des prisonniers républicains irlandais de 1981, l’article étudie les procédés généralement utilisés par les autorités pour contourner cette épreuve et affaiblir la puissance de la grève de la faim.
Hantzsch synthesis of bis(1,4-dihydropyridines) and bis(tetrahydrodipyrazolo[3,4-b:4′,3′-e]pyridines) linked to pyrazole units as novel hybrid molecules
Creators: name: Sanad, Sherif M. H.
name: Hawass, Mahmoud A. E.
name: Elwahy, Ahmed H. M.
name: Abdelhamid, Ismail A.
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biophysics
subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Cell Biology
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Developmental Biology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: A novel series of bis(1,4-dihydropyridine-3,5-dicarbonitrile) and bis(tetrahydrodipyrazolo[3,4-b:4′,3′-e]pyridine) derivatives which are linked to pyrazole units were prepared via Hantzsch like reaction of the bis-aldehydes with the respective 3-aminocrotonitrile and pyrazolone derivatives.
Online learning readiness in secondary education: validating the Online Learning Readiness Scale and examining the impact role of ICT familiarity
Creators: name: Vo, De Van
name: Nguyen, Pham Ngoc Thien
name: Power, Jason
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2024

description: Online and blended learning have increased drastically during the pandemic, and their popularity has persisted as we emerge from this global crisis. This study aims to adapt and validate the Online Learning Readiness Scale (OLRS) to assess high school students. Secondary school students were recruited (n = 296) for the study. The OLRS scale included five components: Technology Readiness, Learner Control, Online Communication Self-efficacy, Self-directed Learning and Motivation for Learning. Results supported the OLRS scale in terms of reliability and internal construct validity in context of the study by confirmatory factor analysis and Rasch measurement with partial credit analysis. The differential item functioning analysis revealed no bias issues regarding gender, confirming the measurement invariance statistics achieved. The study also found that the majority of students (73.7%) engaged in online learning solely through their mobile phone. ICT familiarity, i.e., interacting with friends regularly, browsing online learning materials, and watching educational videos on YouTube, had a positive association with students’ readiness for online learning. Students’ access to social networks, online forums and online music did not have a significant effect on their readiness for online learning. The scale demonstrated the capacity to function as an assessment instrument for evaluating readiness for online learning in the context of secondary education. Educational implications were considered, including key requirements of supporting technology and pedagogical practice in online and blended learning environments.
description: Journal of e-Learning and Knowledge Society, Vol 20 No 2 (2024): Journal of e-Learning and Knowledge Society - Regular Issue N. 2/2024
Note on Shape Moduli Stabilization, String Gas Cosmology and the Swampland Criteria
Creators: name: Mitchell, Gabrielle A.
name: Brandenberger, Robert
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In String Gas Cosmology, the simplest shape modulus fields are naturally stabilized by taking into account the presence of string winding and momentum modes. We determine the resulting effective potential for these fields and show that it obeys the de Sitter conjecture, one of the swampland criteria for effective field theories to be consistent with superstring theory.
description: 4 pages
The symplectic group in Polymer Quantum Mechanics
Creators: name: Garcia-Chung, Angel
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper we provide the representation of the symplectic group $Sp(2n, \mathbb{R})$ in polymer quantum mechanics. We derive the propagator of the polymer free particle and the polymer harmonic oscillator without considering a polymer scale. The polymer scale is then introduced to reconcile our results with those expressions for the polymer free particle. The propagator for the polymer harmonic oscillator implies non-unitary evolution.
description: 20 pages
Ontologia para o Gerenciamento de Segurança da  Informação em Sistemas-de-Sistemas
Creators: name: Roberto Monteiro Dias
Publisher: name: Zenodo
Year: 2022

description: Defesa de Dissertação de Mestrado – ROBERTO MONTEIRO DIASTítulo da dissertação: “Ontologia para o Gerenciamento de Segurança da Informação em Sistemas-de-Sistemas”

BANCA:UNIRIO:RODRIGO PEREIRA DOS SANTOS (Orientador)TADEU MOREIRA DE CLASSE

Docentes externos à UNIRIOJOEL LUÍS CARBONERA

Suplentes da UNIRIOBRUNA DIIRR GONÇALVES DA SILVA

Suplentes externos à UNIRIOMARK DOUGLAS DE AZEVEDO JACYNTHO

 

Data: 18/04/2022 às 14:00
Whither PACE? : the Pacific Association for Continuing Education and the transformation of adult education
Creators: name: Smulders, David
Publisher: name: University of British Columbia
Year: 2010

description: The tradition of adult education as a domain of knowledge and an area for professional practice has yet to define itself to any degree of satisfying consensus, although there are discernable threads or dominant narratives that run through its history and represent particular views of the field. This study takes a close look at one instance of how this struggle for an identity within adult education has played out by examining the final years of the Pacific Association for Continuing Education (PACE), a voluntary professional adult education organization, and considering the reasons behind some of its successes and challenges and ultimately the decision by its membership to disband in the year 2000. The study also focuses on the personal narratives of some of PACE’S members and seeks to allow the voices of the organization’s membership to contribute to the description of its overall character particularly in its final years. The stories of the study participants provide important insights into the unraveling of PACE and how this experience fits into the big picture of adult education. Despite commitment to the aims of adult education, members found themselves in an organization that had been conceived and launched under a particular set of social and political circumstances, which then changed over time. Subsequent years of PACE’S history were thus marked by the members7 attempts to reconceptualize the role of the professional adult education organization as their identities as adult educators and the field itself were changing. As a result of these changes, the membership drifted both on an individual basis and collectively from its close association to the post-secondary institutes where adult and continuing education received its most formal recognition. During these years, PACE’S leadership began to change as well, becoming less influential and socially connected within and beyond the world of adult education. Such changes prompted the PACE membership to devote more and more time looking inward, hence the collective self examination that members came to know as ’Whither PACE?” - a series of discussions, reflections and research efforts into defining PACE’S raison d’étre and future directions. Ultimately, the decision was reached that as an organization PACE could no longer represent the voice of adult educators and learners in British Columbia. As a result, members had to confront the unpleasantness of their organization’s own demise.
Metal-free synthesis of 2-mercaptobenzothiazoles and 6-(4-substituted-1H-1,2,3-triazol-1-yl)-2-mercaptobenzothiazoles via microwave-assisted synthesis pathway
Creators: name: Tung, Truong Thanh
name: Huy, Luong Xuan
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Biotechnology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: Plant Biology

description: A simple, efficient, and metal-free methodology for the preparation of 2-mercaptobenzothiazole and derivatives in excellent yields via microwave-assisted pathway is reported. Our condition provides a convenient protocol for the synthesis of a diverse collection of 2-mercaptobenzothiazoles and 6-(4-substituted-1H-1,2,3-triazol-1-yl)-2-mercaptobenzothiazoles with a very simple purification process. This report provides an alternative protocol for fast access to the wide range of compounds for sequence synthesis and biological studies.
title: Advancements in equivalence checking for abstract argumentation frameworks
Creators: name: Bellositz, Patrick
Publisher: name: TU Wien
Year: 2018
Subjects: subject: Abstract Argumentation
subject: Answer Set Programming
subject: Äquivalenz
subject: Nonmonotones Schließen
subject: Abstract Argumentation
subject: Answer Set Programming
subject: Equivalence Notions
subject: Nonmonotonic Reasoning

description: Formal Argumentation is an actively studied field within Artificial Intelligence. Abstract Argumentation Frameworks (AFs), introduced by Dung in 1995, are an approach to reason over inconsistent knowledge. This knowledge is represented by arguments which may attack one another. Sets of non-conflicting arguments may then be grouped into extensions according to some argumentation semantics of which many different ones have been introduced over the years. When working with AFs, changes in arguments and attacks may occur and therefore change the information contained within the framework. Hence abstract argumentation can be described as dynamic reasoning. To study the effects of such changes to AFs and whether they affect changes in extensions, different notions of equivalency have been proposed. These include standard, expansion, strong and C-relativised equivalence. C-relativised equivalence is defined for the stable, admissible, preferred, complete and grounded semantics originally introduced by Dung. These semantics are modified (i.e. C-restricted) to only consider the relations of a set of core arguments. By not reasoning over all arguments, this concept enables local replacements of sub-AFs. This thesis examines how to automate C-relativised equivalence checking to replace large numbers of locally equivalent frameworks with simpler alternatives and therefore reduce computational strain on AF solver programs. This goal is achieved by formally defining C-relativised equivalency patterns that guarantee equivalence of an AF before and after replacement of a sub-AF therein with respect to some semantics and under some constraints for attack relations. To find C-relativised equivalence patterns, this work presents a system of encodings of C-restricted semantics as well as C-relativised equivalence characterisations. This system accepts arbitrary numbers of AFs and determines whether they are pairwise equivalent. For this work, the results of large numbers of equivalency computations are systematically analysed to find C-relativised equivalency patterns. Found patterns are then formally proven and the effects of applying them to generated frameworks are discussed, based on experiments that are conducted.
Trends in the use of Multivariate Analysis in Educational Research: a review of methods and applications in 2018-2022
Creators: name: De Santis, Annamaria
name: Sannicandro, Katia
name: Bellini, Claudia
name: Minerva, Tommaso
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2024

description: Multivariate analysis is a statistical solution effectively used to investigate educational phenomena. It operates simultaneously on many variables and data and allows the development of classifications and models by returning data-driven understandings. How does the international educational research community make use of multivariate analysis techniques? We conducted a methodological review to identify trends in applying these methods in education. We extracted only papers written in English, indexed in Scopus, and published from 2018 to 2022 in journals in the Education category. Our review included bibliometrics such as years of publications, leading journals, and most cited articles. We detected an increase in papers using multivariate analysis in the educational research in Scopus publications over the past five years, particularly in journals in quartiles Q1 and Q2. MANOVA represents the main method used for the analysis along with regression methods; the former may be overestimated due to the overlap of names with terms searched in the string. University students represent the preferred experimental subjects for investigation; the administration of surveys and questionnaires is the most practiced way to collect data; preferred analysis tools among those declared are non-free. Based on the topics, some research categories emerged: Teaching, Medical Education, STEM, Digital Education, Professional Development, Inclusion, Wellbeing. However, the number of citations is low (less than 8) for three-quarters of the articles in our selection. To increase the effective use, confidence, and understanding of multivariate analysis processes, appropriate skills in education, statistical analysis, and interpretation of results need to be strengthened.
description: Journal of e-Learning and Knowledge Society, Vol 20 No 1 (2024): Journal of e-Learning and Knowledge Society - Regular Issue N. 1/2024
Les lois économiques doivent-elles s’appliquer aux biens de subsistance ?
Creators: name: Clément, Alain
name: Clément, Alain
Publisher: name: Unknown
Year: 2006
Subjects: subject: Agricultural and Food Policy
subject: economic laws
subject: norms
subject: rules
subject: agricultural exception

description: While many very general laws exist in economics (Malthus’s law, the law of supply and demand,;Engel’s law, etc.) attesting that the scientific character of the discipline, ‘vital resources’ fall into a category of;their own and are recognised as such. This has led to the creation of knowledge and specific laws that are not;applicable and not transposable to other areas of economics (e.g. the King-Davenant law). Some economists have;even proposed to transfer ‘vital resources’ because of their specific character from the domain of economics to another;disciplinary, moral and political domain, more in relation with our way to think the role of subsistence goods in;the history of humanity. Thereby they opened the way and provided justification for other types of (normative);‘man-made’ laws and for rules and norms. It is then easier to understand why, even in today economic debates, we;talk of the ‘agricultural exception’. S’il existe de nombreuses lois très générales en économie (loi de Malthus, loi de l’offre et de la;demande, loi d’Engel, …) qui témoignent du caractère scientifique de la discipline, « les vivres »;constituent un champ spécifique, reconnu comme tel, qui débouche sur la formation d’un savoir et de;lois particulières, non applicables, non transposables à d’autres champs de l’économie (loi de;King-Davenant, par exemple). Dans le passé, un certain nombre d’économistes ont même proposé que;« les vivres » sortent du champ de l’économie, en raison de cette spécificité, et rejoignent un autre;champ disciplinaire, moral et politique, plus conforme à l’idée que nous nous faisons du rôle des;subsistances dans l’histoire de l’humanité. Ils ont ainsi ouvert la voie et la justification à d’autres types;de lois (normatives) à des règles et des normes édictées par les hommes. On comprend mieux pourquoi,;aujourd’hui encore, on parle « d’exception agricole » dans les débats économiques.
Mixing and Combustion in a Laminar Shear Layer with Imposed Counterflow
Creators: name: Sirignano, William A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Three-dimensional laminar flow structures with mixing, chemical reaction, normal strain, and shear strain qualitatively representative of turbulent combustion at the small scales are analyzed. A mixing layer is subjected to counterflow in the transverse y- and z-directions. Both non-reactive and reactive flows are examined. Reduction of the three-dimensional boundary-layer equations to a one-dimensional similar form is obtained allowing for heat and mass diffusion with variations in density and properties. In steady configurations, a set of ODEs governs the three velocity components as well as the scalar-field variables. A flamelet model for individual diffusion flames with combined shear and normal strain is developed. Another model with solution in similar form is obtained for a configuration with a dominant diffusion flame and a weaker fuel-rich premixed flame. Results for the velocity and scalar fields are found for ranges of Damkohler number Da, normal strain rate due to the counterflow, streamwise-velocity ratio across the mixing layer, Prandtl number, and Mach number. For the flamelet model, a conserved scalar is cast as the independent variable to give an alternative description of the results. The imposed normal strain decreases mixing-layer thickness and increases scalar gradients and transport rates. There is indication of diffusion control for partially premixed flames in the multi-branched flame situation. The enhancement of the mixing and combustion rates by imposed normal strain on a shear layer can be very substantial. Also, the imposition of shear strain and thereby vorticity on the counterflow can be substantial indicating the need for flamelet models with both shear strain and normal strain.
description: 51 pages, 19 figures with subfigures
title: 03_0952
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/
title: Combustion of hydrocarbon fuels at normal and elevated pressures
Creators: name: Innerkofler, Mathias Sebastian
Publisher: name: TU Wien
Year: 2018
Subjects: subject: Reaktionskinetik
subject: Experimentelle Hochdruckuntersuchung
subject: Simulation
subject: Reaction kinetics
subject: Experimental high pressure investigation
subject: simulation

description: Ein besseres Verständnis des Selbstzündungsmechanismus von Kohlenwasserstoffbrennstoffen und das Auslöschen von Verbrennungsreaktionen sind von grundlegender und praktischer Bedeutung. Die praktische Bedeutung ergibt sich aus der Notwendigkeit, die Betriebsgrenzen für Energieumwandlungssysteme festzulegen. Die Selbstzündung eines Gemisches ist ein Schlüsselparameter in der motorischen Verbrennung, welcher die Leistungsabgabe von Motoren beeinflusst. Der Verbrennungsprozess in diesen Motoren wird als nicht vorgemischte Verbrennung bezeichnet, da der Brennstoff und die Luft erst miteinander vermischt werden, nachdem sie in die Brennkammer injiziert worden sind. In zahlreichen Studien wurde die Selbstentzündung vorgemischter Systeme behandelt. Im Vergleich dazu gibt es nur sehr wenige Studien zur Selbstzündung in nicht vorgemischten Systemen. Für homogene vorgemischte Systeme wurden sogenannte Shock Tubes verwendet, um die Zündverzugszeiten als Funktion der Temperatur und der Konzentration von Kraftstoff und Sauerstoff in der Reaktantenmischung zu messen. Diese Studien befassen sich jedoch nicht mit den Einflüssen des Strömungsfeldes auf die Verbrennungsvorgänge. Die im Rahmen dieser Forschungsarbeit durchgeführten experimentellen und numerischen Untersuchungen beschäftigen sich mit der Selbstzündung und der Auslöschung von Alkanen mit hohem Molekulargewicht in laminaren, nicht vorgemischten Strömungen.
description: An improved understanding of mechanism of autoignition of hydrocarbon fuels and extinction of combustion reactions are of fundamental and practical importance. The practical importance arises from the need to establish limits of operation of energy conversion systems. Autoignition is a key parameter that influences the performance of compression ignition engines. Combustion process in these engines are considered to be nonpremixed because the fuel and air are mixed after they enter the combustion chamber. Numerous studies have addressed autoignition in premixed systems. In comparison there are very few studies of autoignition in nonpremixed systems. For homogeneous premixed systems shock tubes have been used to measure ignition delay times, as a function of temperature and concentration of fuel and oxygen in the reactant mixture. These studies, however, do not address the influences of the flow field. The research described in this thesis is an experimental and computational investigation of the autoignition and extinction of high molecular weight alkanes in laminar, nonpremixed, and nonuniform flows.
Prévention des déficiences chez les personnes sans-abri : intérêt d’un aliment de rue enrichi
Creators: name: Darmon, Nicole
name: Briend, André
name: Darmon, Nicole
name: Briend, André
Publisher: name: Unknown
Year: 2006
Subjects: subject: Food Consumption/Nutrition/Food Safety
subject: homeless
subject: fortified food
subject: nutrient deficiencies
subject: economic value
subject: food aid

description: Pour mieux prévenir la dénutrition et les déficiences vitaminiques et minérales chez les personnes en situation d’exclusion, nous avons mis au point un aliment enrichi facile à consommer dans la rue : le Vitapoche®. Il s’agit d’une pâte chocolatée résistante à la contamination bactérienne, emballée dans un sachet hermétique. Cette pâte est naturellement riche en potassium et en acides gras oméga-3. Elle a été enrichie en calcium, zinc et vitamines C, B1, B9, PP, B12, E et D, afin que chaque sachet (70 g, 377 kcal) apporte ces nutriments en quantité nécessaire pour la journée. Outre son intérêt nutritionnel évident, le Vitapoche® présente aussi un double intérêt économique, pour le donateur et pour le bénéficiaire. Une étude d’acceptabilité menée au sein de la population cible à Paris a montré que deux personnes sur trois consommeraient régulièrement du Vitapoche® si elles pouvaient se le procurer facilement. Le Vitapoche® n’est pas un substitut de repas. Il n’est pas destiné à remplacer l’aide alimentaire déjà existante, mais il la complète, afin d’en optimiser la qualité nutritionnelle.
Experiences in higher education in times of pandemic: a systematic review of the literature
Creators: name: Ramirez-Barrera, Andres
name: Rojas-Berrio, Sandra
name: Rincon-Novoa, Jeisson
name: Montoya-Restrepo, Luz Alexandra
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2024

description: This paper aims to review the literature related to the experience of students and teachers in Higher Education in times of the COVID-19 pandemic. A Systematic Literature Review was conducted using the scientific databases Scopus and Web of Science, following the Preferred Reporting Items for Systematic Reviews and Meta Analyses (PRISMA) guidelines, structured in three stages of the experience: Pre-Core, Core and Post-Core. The results provided by the 105 studies selected for the review are heterogeneous and diverse in terms of the positive and negative factors and elements of the Higher Education Experience in the global health crisis. The method with the highest presence in the selected studies was quantitative with 51.4% and its main instrument was the questionnaire. Likewise, social interaction in the context of Higher Education is one of the most negatively impacted dimensions of the transition to distance education, with important implications for the mental health of students and teachers.
description: Journal of e-Learning and Knowledge Society, Vol 20 No 1 (2024): Journal of e-Learning and Knowledge Society - Regular Issue N. 1/2024
Cuisiner ensemble : ethnographie de trois ateliers cuisine
Creators: name: Augor, Mélanie
name: Lhuissier, Anne
name: Augor, Mélanie
name: Lhuissier, Anne
Publisher: name: Unknown
Year: 2006
Subjects: subject: Food Consumption/Nutrition/Food Safety
subject: low income people
subject: culinary exoticism
subject: culinary habits
subject: social integration
subject: social work

description: This article is based on participant observation in three “ateliers cuisine” organised in community centres located in Paris (France). Participant involvement in culinary activities is expected, in a purpose of social integration. The study highlights two main characteristics of this activity, which appears through its cultural and collective dimension: the question of the “culinary exoticism” and the “relation with Other”. Moreover, the collective character of the culinary activity arouses social relations which are based less on culinary skills than on the social positions and properties of the participants, within the “atelier”, within the centre, and more generally within their social life. Furthermore, the collective dimension underlines the various positions of the three “ateliers” on a continuum of situations. This continuum is defined by hierarchical social relations and by meanings of the culinary activity which are supported between “making together” and “to be together”. L’enquête ethnographique menée auprès des ateliers cuisine de trois centres sociaux parisiens a mis en évidence deux aspects caractéristiques de cette activité, qui apparaissent à travers les dimensions culturelles et collectives de l’activité. Les origines diverses des personnes présentes favorisent de nombreuses interactions autour de « l’exotisme culinaire » et façonnent la « relation à l’Autre ». Par ailleurs, le caractère collectif de l’activité suscite des relations sociales qui se fondent moins sur les compétences culinaires que sur les positions et propriétés sociales des participantes, au sein de l’atelier, du centre, et plus généralement de leur vie sociale. Enfin, la dimension collective met en évidence la position différenciée des ateliers sur un continuum de situations, défini par des relations sociales hiérarchisées et des conceptions de l’activité culinaire qui s’étayent entre «faire ensemble » et « être ensemble ».
Factors Influencing 360-Degree Video Adoption in e-Learning: a UTAUT2 Case Study with Pre-service Primary Education Teachers in Spain
Creators: name: Rodríguez-Gil, María Esther
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2024

description: This study analyses the acceptance of immersive virtual reality (iVR) videos among e-learning students (N=198) enrolled in a Primary Education Degree English course at the University of Las Palmas de Gran Canaria. iVR, with its ability to create realistic and interactive virtual environments, has emerged as a transformative tool in enhancing learning experiences. Its application extends to higher education, proving invaluable for pre-service teacher training through an authentic simulation of classroom dynamics. Acknowledging the pivotal role of student acceptance and comfort with this technology, this research aims to understand the factors influencing its efficacy. To measure acceptance, students actively engaged in a competency activity, immersing themselves in the analysis of a 360-degree-recorded classroom practice within a Primary Education setting. Subsequently, a structured questionnaire, based on the Unified Theory of Acceptance and Use of Technology 2 (UTAUT2), was administered. This questionnaire assessed the factors influencing the acceptance of this educational technology across eight dimensions and their behavioral intentions to use it. Results from this investigation underscore that the factors Hedonic Motivation, Performance Expectancy and Effort Expectancy received the highest ratings among participants. Conversely, lower ratings were observed for Habit and Price Value. Confirmatory factor analysis demonstrated that the UTAUT2 model effectively captured preservice teachers’ perceptions of iVR across all dimensions (Performance Expectancy, Effort Expectancy, Social Influence, Facilitating Conditions, Hedonic Motivation, Price Value, Habit and Behavioural Intention).
description: Journal of e-Learning and Knowledge Society, Vol 20 No 1 (2024): Journal of e-Learning and Knowledge Society - Regular Issue N. 1/2024
Eureka moments : pivotal learning experiences in the workplace
Creators: name: Carbert, Hana
Publisher: name: University of British Columbia
Year: 2010

description: This study aims to illuminate the content and structure of workplace learning by novice managers. Combining cognitive and humanist learning theory concepts, it explores the relationship between learning content and learning structure. Data was collected through semi-structured interviews with ten early-career managers, in a retrospective look at specific workplace experiences, which resulted in significant learning. The learning deemed valuable comprised of formulating a subjective meaning of the management role, adapting to human and organizational dynamics, and forming their own identity as managers and individuals. These processes intersected and occurred simultaneously. The structure most commonly found started with some ’hard learning’, when the novices experienced failure or surprise. The learning was dramatic, rather than gradual, and emotions along with high stakes played a role in mobilizing the learning effort and willingness to adapt. Stakes were largely internal, defined in terms of self-esteem or self-perception. Reflection, following the experience, was very much in evidence and much of the learning occurred in the movement between adaptation or experimentation and reflection. Learning was strengthened through repeat experiences, sometimes from different perspectives, and confirmed through successes. New perspectives and insights emerged some time after the triggering incident, usually through reflection. Experiences triggered an examination and transformation of assumptions and values. Dispositional learning therefore occurred through an experiential, discovery process. These transformations led to experimentation with different ways of acting (procedural learning) and often led the novices to seek guidance. Dispositional learning thus emerged as the leading variable. Guidance played a role in prepositional and procedural learning, and expanded the learners’ horizons. Guidance did not precede the engagement with a situation, but was valued and sought from by the participants from a variety of individuals in response to specific workplace problems. The learners saw themselves playing the leading role, and factors internal to the learner exceeded external factors in importance. Self-confidence, self-efficacy, and the ability to reflect were most evident, and allowed the respondents to face new challenges, having developed an ability to treat task failures objectively, without impacting their sense of identity.
From learning machines to teaching robots. Interaction for educational purposes between the Social Robot NAO and children: a systematic review
Creators: name: Rossi, Lino
name: Orsenigo, Enrico
name: Bisagno, Elisa
name: Cadamuro, Alessia
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2024

description: Interaction between social robots and children occurs today in a variety of environments, including schools, hospitals, and homes. This review aims to highlight studies that delve into this interaction in the educational settings, exploring the characteristics of the social robot NAO and how its features influence its relationship with children. A search was conducted on July 1st, 2023 in Scopus and PsychInfo. Inclusion criteria pertained to (1) typical development; (2) age range 4-12 years; (3) educational setting; (4) type of robot (NAO); (5) type of publication: peer-reviewed journal; (6) language: English; (7) research studies. Of the 116 results that emerged from the search, 92 were excluded, yielding 24 valid results. We classified the records into two categories, namely 17 results were included in the “NAO as an informational and educational tool” category and 7 in the “NAO as a relational agent” category. The first category considers all studies where social robots were used as tools for educational and informational support; these studies delve into topics related to the teaching of school subjects and personalized learning, with a specific focus on emotional education. In the second category, we encounter studies that explore the relationships between children and robots, with a primary emphasis on the phenomenon of anthropomorphism, the attribution of mental states, touch interaction, and the robot's caregiving abilities. Based on the present review, social robots like NAO emerge as potential resources to implement new forms of teaching and interaction within the educational context; however, more research is needed to design...
description: Journal of e-Learning and Knowledge Society, Vol 20 No 1 (2024): Journal of e-Learning and Knowledge Society - Regular Issue N. 1/2024