OPINIONS OF TEACHERS ON THE MANIFESTATIONS OF STUDENTS\u27 CREATIVITY IN THE STUDY OF NATURAL SCIENCES

Creativity is a complex concept, defined in the literature of the field as the ability to generate original ideas, methods or objects or to reuse existing ones in a new way. Research on creativity has focused both on the characteristics of creative personalities (thinking, attitude, behavior) and on creative processes and products. They also aimed to identify a typology of creativity and characteristics of creative personalities. Creative teaching is an art for which there are no recipes for success or routines. However, the teacher\u27s pro-creativity strategy and the use of teaching strategies with a recognized impact to develop creativity can stimulate students\u27 creative thinking and attitudes and form behaviors designed to contribute to the realization of products considered to be creative. The study of natural sciences, through the methodology specific to the process of scientific knowledge facilitates the development in students of those reasonings valuable for creative thinking: convergent, divergent, associative and synthetic reasoning. Also, the variety of manifestations of science in our lives stimulates emotional creativity. This study presents the results of a survey that aimed to explore teachers\u27 opinions on student creativity and the manifestations of students\u27 creativity in the study of natural sciences. 112 teachers participated in the research and participation in the survey was voluntary, the data being collected online. The majority of respondents said that they develop the creativity of their students by valuing creativity, by using modern teaching methods, by permanently adapting the methodology, by offering the possibility to make choices and having options, by offering models of creative behavior or by ensuring a diversity of creative products. All respondents agreed that the students\u27 creativity can be easily developed in full subjects of the natural sciences

Phases et nouveaux composés à base de magnésium pour le stockage de l'hydrogène

This work deals with the study of ternary compounds Rare Earth – magnesium - nickel used ofr hydrogen storage. All the compounds are prepared by fusion and by mechanical alloying method.. The compounds YNi4-xAlxMg, derived from the cubic Laves phases have been studied in the first part. It reacts reversibly towards hydrogen at atmospheric pressure and room temperature. The structural behaviour during the hydrogen sorption has been studied by in situ XRD. The compound remains cubic with a decrease of the crystallinity.This study is completed by the study of compounds : (i) rich in rare earth (e.g. Gd4NiMg) that absorb hydrogen at room temperature but irreversibly. Structures of both the intermetallic and the hydride have been determined. The decomposition of the hydride at temperature higher than 90°C is also explained. (ii) rich in magnesium. A new compounds with a formulation closed to Mg77Gd9Ni14.5 has been identified and it crystallized with a cubic faces centred structure.Ce mémoire de thèse concerne l'étude des composés ternaires Terre rare–magnésium–nickel utilisable pour le stockage de l'hydrogène. Ces composés ont été obtenus par fusion ou par mécanosynthèse. Les intermétalliques YNi4-xAlxMg, dérivant des phases de Laves de structure cubique ont été étudiés. Ils réagissent de manière réversible avec l'hydrogène à P et T ambiantes. Le comportement structural lors d'une hydruration a été étudié par DRX in situ. Le composé conserve sa symétrie cubique mais avec diminution de la cristallinité. Cette étude est complétée par l'étude de composés : (i) riche en terre rare (e.g. Gd4NiMg) qui absorbe l'hydrogène à température ambiante de manière irréversible. La structure de l'intermétallique et de l'hydrure sont déterminées. La décomposition de l'hydrure à température supérieure à 90°C est expliquée. (ii) riche en magnésium. Nous avons pu identifié un nouveau composé de formulation proche de Mg77Gd9Ni14.5 de structure CFC

Laves phases and new compounds based on magnesium for hydrogen storage application

Ce mémoire de thèse concerne l'étude des composés ternaires Terre rare–magnésium–nickel utilisable pour le stockage de l'hydrogène. Ces composés ont été obtenus par fusion ou par mécanosynthèse. Les intermétalliques YNi4-xAlxMg, dérivant des phases de Laves de structure cubique ont été étudiés. Ils réagissent de manière réversible avec l'hydrogène à P et T ambiantes. Le comportement structural lors d'une hydruration a été étudié par DRX in situ. Le composé conserve sa symétrie cubique mais avec diminution de la cristallinité. Cette étude est complétée par l'étude de composés : (i) riche en terre rare (e.g. Gd4NiMg) qui absorbe l'hydrogène à température ambiante de manière irréversible. La structure de l'intermétallique et de l'hydrure sont déterminées. La décomposition de l'hydrure à température supérieure à 90°C est expliquée. (ii) riche en magnésium. Nous avons pu identifié un nouveau composé de formulation proche de Mg77Gd9Ni14.5 de structure CFC.This work deals with the study of ternary compounds Rare Earth – magnesium - nickel used ofr hydrogen storage. All the compounds are prepared by fusion and by mechanical alloying method.. The compounds YNi4-xAlxMg, derived from the cubic Laves phases have been studied in the first part. It reacts reversibly towards hydrogen at atmospheric pressure and room temperature. The structural behaviour during the hydrogen sorption has been studied by in situ XRD. The compound remains cubic with a decrease of the crystallinity.This study is completed by the study of compounds : (i) rich in rare earth (e.g. Gd4NiMg) that absorb hydrogen at room temperature but irreversibly. Structures of both the intermetallic and the hydride have been determined. The decomposition of the hydride at temperature higher than 90°C is also explained. (ii) rich in magnesium. A new compounds with a formulation closed to Mg77Gd9Ni14.5 has been identified and it crystallized with a cubic faces centred structure

Deconstructing and Reconstructing Identity. Philosophical Frames and Literary Experiments

AbstractOf all the crises postmodernity continues or itself generates, the identity crisis tends to be considered symptomatic. The search for identity was an imperative in modernism, culminating in the literature of existentialist influence. In postmodernism, the individual's cutting off from transcendence, the loss of essence and meaning of existence itself are no longer considered a tragedy. He turns towards the past in an ontological need for spiritual regeneration, the modernist epistemological doubt being replaced by the ontological one.That one of the dominant, obsessively resurfacing issues of the mid and late twentieth-century fiction is the problem of the subject, of constructing identity, has probably been due to the tremendous influence that psychoanalytic writings have had upon the contemporary mind and stage. Postmodern, hyperrealist, magic realist and all the other experimental types of writing have primarily focused on this problem reflected in fictional characterisation, authorship and intentionality, reception and readership, narrative technique, style, genre and thematics

Dialogism in the Discourse on Human Trafficking

AbstractSumming up part of the results of the research carried out by the Romanian team of “Dunărea de Jos” University of Galaţi in the international FP7 project Gender, Migration and Intercultural Interaction in the Mediterranean and South-East Europe (Ge.M.IC.) (2008-2011), the paper focuses on human trafficking as the most violent, gender-marked form of migration. It aims at exploring the dynamics of trafficking-related conceptual frameworks at the crossroads of the public and private spheres as well as at assessing the impact of various discursive patterns on the (lack of) visibility of victims of violence. In this respect, it juxtaposes, for comparative purposes, two kinds of discursive patterns: the mainstream public – legal and institutional– discourses on trafficking that characterize the Romanian context, on the one hand, and individual testimonies of professionals working in various institutions that monitor the phenomenon and/or provide assistance to the victims in the Galaţi area, on the other

Control of the Mg-Treated Iron Casting Skin Formation by S-Diffusion Blocking at the Metal–Mould Interface

Having established that sulphur presence in the mould materials appears to have an important contribution in graphite degeneration at least in the casting surface layer, a research program is undertaken to explore the possible beneficial effect of sulphur diffusion blocking at the metal–mould interface. Test samples, with and without a thin steel sheet (up to 3 mm thickness) application on the inner surface of the mould cavity, before iron melt pouring, are considered for structure analysis. A higher nodulizing potential (0.048% Mgres, 0.015% Ceres, and 0.006% Lares) decreases the occurrence of surface graphite degeneration in castings obtained in rigid chemically bonded resin sand moulds, using P-toluol sulfonic acid (PTSA) hardener (S-including), but it is not enough to avoid this phenomenon (200–400 μm skin in present experimental conditions). The casting skin appears to have different values, depending on the evaluation technique (un- and Nital-etching direct measurement, or graphite parameters variation on the casting section). In the presence of a thin steel sheet at the metal–mould interface, the casting skin thickness decreases or is just excluded. It is supposed that it acts as a barrier, blocking S-diffusion from the mould media into the iron melt. Without this S-diffusion, the graphite degeneration in the casting surface layer could be avoided, or at least diminished. For industrial application, the increasing of residual content of nodulizing elements is a limited solution, and it is recommended to use barriers to block S transfer on the mould/metal surface, such as dense coatings or coatings with desulphurization capacity

Graphite Nodularity Evaluation in High-Si Ductile Cast Irons

Ferritic high-Si ductile cast irons replace an unstable mixed ferrite-pearlite matrix with a unique combination of high elongation, strength and hardness (ideal for automotive drive train components) and resistance to oxidation and corrosion at high temperatures (automotive exhaust and turbocharger systems). The present paper analyses the graphite parameters of 4.5%Si, un-inoculated ductile cast iron (4.7%CE, 0.035%Mgres) as an effect of the casting section size. The structure is characterized by 10.5–11.2% graphite and 464–975 nodules/mm2, at more than 70% ferrite and no carbides, including at 3 mm wall thickness. The lower the wall thickness is, the higher the nodule count is and, consequently, the higher the ferrite amount is. The Roundness Graphite Shape Factor (RSF = 0.65–0.68) illustrates the presence of Slightly Irregular Spheroidal Graphite (Form V ISO 945). There is a big difference between the graphite nodularity evaluated according to ISO 16112:2017 [CGI] (NG1 = 79–86%) and according to ISO 945-4-2019 (DI) (NG2 = 65.2–74.6%), both of them based on RSF. Graphite Nodularity (NG3), calculated with the ISO 945-4-2019 [DI] formula, but replacing RSF with SSF, Sphericity Graphite Shape Factor, has an intermediary position. The higher the imposed minimum RSF or SSF is, the lower the Graphite Nodularity (NG4, NG5): 80–90% for min. 0.50 (minimum Form IV or Intermediate Graphite), 60–80% for min. 0.60–0.65 (minimum Form V graphite) and 35–70% for min. 0.80 (minimum Form VI graphite). The SSF is more representative than the RSF for Si-alloyed ductile cast iron, so it is recommended to use a graphite nodularity calculus considering SSF instead of the RSF formula (stipulated by ISO 945-4-2019), with SSF replacing RSF