Search results for "IBS"
showing 10 items of 128 documents
Testing a portable laser-induced breakdown spectroscopy system on geological samples.
2012
9 pages; International audience; This paper illustrates the potentialities of a home-made portable LIBS (laser-induced breakdown spectroscopy) instrument in Earth sciences, more particularly in geochemically recognizing (i) tephra layers in lacustrine sediments and (ii) fossilization processes in ammonites. Abundances for selected lines of Al, Ca, Fe, Ti, Ba and Na were determined in lacustrine chalk sediments of the Jura, where the Laacher See Tephra (LST) layer is recorded. A statistical treatment of elemental maps produced from the section of a sedimentary column containing the LST event allows instrumental conditions to be optimized. Accumulating spectra from close shot positions gives …
Kuva, havainto ja todellisuus : todellisuudesta ja kuvasta muodostuvat havainnot sekä niiden vastaavuus kuvioiden, objektien, tilan ja syvyyden suhte…
2000
H$^{-}$ extraction systems for CERN’s Linac4 H$^{-}$ ion source
2018
Linac4 is a 160 MeV linear H accelerator at CERN. It is an essential part of the beam luminosity upgrade of the Large Hadron Collider (LHC) and will be the primary injector into the chain of circular accelerators. It aims at increasing the beam brightness by a factor of 2, when compared to the currently used 50 MeV linear proton accelerator, Linac2. Linac4’s ion source is a cesiated RF-plasma H ion source. Several beam extraction systems were designed for H beams of 45 keV energy, 50 mA intensity and an electron to H ratio smaller than 5. The goal was to extract a beam with an rms-emittance of mm mrad. One of the main challenges in designing an H extraction system is dumping of the co-extra…
Comparison of LIBS and micro-XRF measurements on bronze alloys for monitoring plasma effects
2011
The laser-induced breakdown spectroscopy (LIBS) technique is often used as atomic spectroscopic technique for elemental analysis of materials. However, it presents some drawbacks that make an accurate quantitative analysis difficult. Since the plasma properties, such as spatial inhomogeneity and plume stoichiometry strongly depend on the experimental conditions, the measurements are less reproducible. In order to evaluate the measurement fluctuations, we propose to use the more established micro X-Ray fluorescence (μ-XRF) technique for validating LIBS data. In particular, the quantitative data, obtained by varying the laser fluence, the shot numbers and the temporal acquisition parameters, …
Costruzione e validazione del questionario DIDLab “La didattica Laboratoriale: apprendimenti e stili di conduzione con l’approccio IBSE”
2021
Il presente lavoro espone gli esiti della costruzione e validazione del questiona-rio “La didattica Laboratoriale: apprendimenti e stili di conduzione con l’ap-proccio IBSE” finalizzato a misurare il grado di conoscenza dell’approccio In-quiry-Based Science Education e lo stile di conduzione nella didattica labora-toriale, che ha visto coinvolti 523 corsisti del corso di specializzazione per le attività di sostegno didattico dell’Università degli Studi di Palermo; il test di misurazione costruito è composto da 42 item suddiviso in cinque macro-aree su scala Likert a 5 punti. Dall’analisi quantitativa condotta è emerso che il questionario ha buona con-cordanza, pensato per indagare sulle con…
Investigating Teacher Pedagogical Content Knowledge Of Scientific Inquiry
2014
This paper analyses the scientific inquiry in the context of modelling physical systems and point out some related teaching/learning strategies. Two relevant points are also discussed: i)- the different representations of scientific inquiry held by a sample of secondary school physics teachers and their competencies in conducting investigations aimed at solving scientific problems; ii)- what kind of supports can be supplied to teachers in order to modify their misconceptions about scientific inquiry and develop adequate competences related to Pedagogical Content Knowledge of Scientific Inquiry. The topic will be analysed in the light of some preliminary results of a course for in-service ph…
Impact of IBSE Methods and IBSE Materials on Student/Teacher Learning
2014
This study reports on the use of Inquiry-based science education (IBSE) materials and activities on the concept of Sound that have been used to teach lower and upper secondary school students by teachers who have participated in IBSE teacher education (Slovakia, Italy) as well as to teach pre-service teachers (Ireland). An IBSE method has been adopted by the ESTABLISH project (FP7, 2010-2013) to promote the implementation of innovative teaching and learning approaches for student-led inquiry based activities in the classroom. An IBSE approach is considered to encourage students´ active involvement in their learning compared to traditional methods. This project has developed teaching and lea…
An approach to the concept of statistical distribution: a pedagogical path based on Guided Inquiry
2014
This paper describes a teaching approach to the concept of distribution that uses a specific activity related to the field of statistical mechanics. The concept of velocity distribution of a particle system is dealt with using an Inquiry Based approach involving an experimental examination of Maxwell’s Distribution. Some outcomes of a teaching experiment are described.
Open Inquiry based learning experiences to understand the Nature of Science
2014
In this paper we address the question of the efficacy of an inquiry-based learning approach, with different levels of teacher’s guidance, to introduce the students to fundamental aspects of the Nature of Science (NoS). Explicit pedagogical approaches, in which specific instruction on the topic of NoS is provided in addition to the engagement in scientific inquiry, are generally considered more effective with respect to implicit methods, where NoS conceptions are expected to develop as a natural consequence of inquiry-based learning experiences alone. In our study, we further explore the connections between scientific inquiry and implicit development of NoS conceptions, by investigating the …
Inquiry based Laboratory. Una ricerca con i futuri docenti di sostegno.
2021
La formazione degli insegnanti in laboratorio è particolarmente rilevante perché consente di a t t i v a r e p r o c e s s i d i i n s e g n a m e n t o / apprendimento in cui gli alunni diventano protagonisti dei propri percorsi. Il laboratorio rappresenta la modalità trasversale che caratterizza la didattica e la formazione dei futuri docenti. Attraverso la didattica laboratoriale gli studenti hanno la possibilità di confrontarsi, di mettere in atto le abilità critiche, logiche e creative per esplorare la realtà circostante. Ciò si coniuga perfettamente con le possibilità che garantisce un laboratorio scientifico Inquiry-Based Learning centrato sul processo di investigazione. Nel presente…