1,720,991 research outputs found
Experiments and representations in quantum physics: teaching module on the photoelectric effect and the Franck-Hertz experiment
No full textA teaching module, centered on the photoelectric effect and the Franck-Hertz
experiment, was designed for upper secondary school students. The activities have been built
upon three design principles, brought out from an analysis of the current research literature about
laboratories, learning/teaching quantum physics and representations in physics education
Total p-nitrophenol determination in urine samples of subjects exposed to parathion and methyl-parathion by SPME and GC/MS
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Accepting Quantum Physics: analysis of secondary school students’ cognitive needs
No full textIn this paper, we report some results obtained in classroom implementations of Quantum
Physics teaching proposals, carried out in different school contexts. In particular, we observed
significant cases of students who did not accept quantum physics as a personally reliable and
convincing description of physical reality – cases of ‘non-acceptance’ –, even though they
seemed to understand the basic concepts of quantum physics as they were proposed. A
qualitative semantic analysis has been carried out on students’ interviews, so as to individuate
the main cognitive needs emerging in learning quantum physics, and that have to be satisfied
in order to make it acceptable, to a degree. We found three of them - need of visualization,
need of comparability, and need of ontology - emerging from students’ words, and used them
to reread discourses of all students, despite their degree of acceptance. As this is a preliminary
study, further work is suggested to better understand acceptance dynamics, to eventually
operationalize its recognition in students’ discourses and to design instruction materials
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Urinary benzene determination in subjects exposed to low environmental concentrations using SPME and GC-MS
No full textSpitz nevi: Defining features and management in children Spitz nevi in children
No full textWe reviewed literature data in order to better define clinical features of Spitz nevi in children. Lots of interest has been given in the past decade to these neoplasms that due the clinical course and sometime the rapid onset, may often cause worrisome consultations. Dermoscopy has played an important role in the improved diagnostic capability of clinicians, regarding all melanocytic neoplasms and also spitz nevi. The description of specific and typical dermoscopic patterns is largely reviewed as well as the new laboratory diagnostic tools in the field of dermatopathology
Investigation on the presence of aromatic hydrocarbons, policyclic aromatic hidrocarbons, persistent organochloride compounds, phthalates and the breathable fraction of atmospheric particulate in the air of Rieti urban area
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