Knowing about the evolution of atomic models throughout
history
is a fundamental topic to learn about atomic structure. This paper
describes how identifying keywords from a musical YouTube video provides
a stimulating activity for learning this topic in a chemistry class
in middle school. The main goal was to show how a fun and interesting
activity can be planned using a free access video and how great results
can be achieved during the educational process of “teaching-learning”
when generating a high level in interest in the classroom. For this
purpose, a group of students was previously characterized reporting
that many students showed preferences for visual and auditory instructions
in their learning processes. Three (3) experimental groups and one
(1) control group were visited to evaluate learning goals. Within
the control group, only 22% achieved the test as it was carried out,
while in other groups, 98% passed the test using methods from this
research. This paper explains that the activity was planned and evaluated
in three (3) ways: video relevance, development, and methodology of
final evaluation, with successful results and quite positive comments
about the experience from students.
Detection and removal of antipersonnel and antitank landmines is a great challenge and a worldwide enviromental and humanitarian problem. Sensors tuned on the spectroscopic signature of the chemicals released from mines are a potential solution. Enviromental factors (temperature, relative humidity, rainfall precipitation, wind, sun irradiation, pressure, etc.) as well as soil characteristics (water content, compaction, porosity, chemical composition, particle size distribution, topography, vegetation, etc), have a direct impact on the fate and transport of the chemicals released from landmines. Chemicals such as TNT, DNT and their degradation products, are semi-volatile, and somewhat soluble in water. Also, they may adsorb strongly to soil particles, and are susceptible to degradation by microorganisms, light, or chemical agents. Here we show an experimental procedure to quantify the effect of the above variables on the spectroscopic signature. A number of soil tanks under controlled conditions are used to study the effect of temperature, water content, relative humidity and light radiation.
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