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Education Sciences | Free Full-Text | How Crosscutting Is the Energy Concept within Physics Teaching and Learning

Much of the attention on the crosscutting concepts within the Next-Generation Science Standards (NGSSs) have gone to their coherence across different STEM disciplines. In this paper, we raise the question of the coherence of the energy concept within the teaching and learning of physics itself. Our investigations of teachers’ and students’ approach to solving problems, where both mechanical and thermal energy play equally important roles, indicate that the separation of energy studies in different units (mechanics, thermodynamics, etc.) leads to a cognitive disconnect of the understanding of different energy types and the inability to explain processes that involve both mechanical and internal energy, especially when the internal energy of the living organisms that are associated with a process is involved. We also find that when students gain experience analyzing scenarios where thermal energy plays a subtle yet critical role in addition to mechanical energy, they are able ....

United States , College Physics , Student Learning Of Energy , Handbook Of Research , Energy Asa Crosscutting Concept , Crosscutting Concept , American Journal , Energy Instruction , High School , Physics Education , Student Understanding , Compressed Air Water , Investigative Science Learning Environment ,

Frontiers | Assessment of pesticide residues in vegetables produced in central and eastern Ethiopia

In Ethiopia, pesticides are widely used in vegetable production. However, if used incorrectly they may harm consumers of vegetables contaminated with pesticide residues, as well as producers handling the pesticides and lead to ecological damage. We performed a cross-sectional survey to assess pesticide residues level in vegetables produced in central and eastern Ethiopia. A total of 232 vegetable samples (91 tomatoes, 106 cabbages and 35 Swiss chard) were collected from fields and retail markets, and were screened for 35 pesticides (20 organophosphate, 14 organochlorine and a synergist, piperonyl butoxide) using GC-MS analysis. Pesticides residues were detected in 60% of Swiss chard, 47% of cabbage and 45% of tomato samples. Two or more pesticides were detected in 20% of cabbages, 13% of tomatoes and over half of Swiss chard samples. Bendiocarb, diazinon, endrin, piperonyl butoxide, profenofos and propargite were detected, but only diazinon, propargite and profenofos had residual value ....

Rift Valley , United States , Dire Dawa , United Kingdom , Asir Region , Saudi Arabia , Al Khartum , North Western , Nairobi Area , Ghana General , Adis Abeba , Lake Ziway , Hareri Hizb , Akaki Kality , B Addis Ababa , Tsegaw Woredekal , Addis Ababa Akaki Kality , Addis Ababa , Legetafo Legedadi , Health Research , Environmental Systems Research Institute , Institutional Research Ethics Committee , International Food Policy Research Institute , Rr Core Team , Public Health , Agilent Technologies Inc ,

Francesco Ferrero

Francesco Ferrero was appointed Director of IT for the Innovative Services Department at the Luxembourg Institute of Science and Technology (List) in December 2021. ....

Security Lab Of Instituto Superiore Mario Boella , Handbook Of Research , Research Group Of The University Luxembourg , Security Lab , Instituto Superiore Mario Boella , Transport Research Group , Data Driven Multimodal Mobility , Future Smart ,