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Учебный эксперимент для уругвайских студентов:

Magnetic fields produced by electric railways: https://arxiv.org/abs/2006.06481

We propose a simple experiment to explore magnetic fields created by electric railways and compare them with a simple model and parameters estimated using easily available information. A pedestrian walking on an overpass above train tracks registers the components of the magnetic field with the built-in magnetometer of a smartphone. The experimental results are successfully compared with a model of the magnetic field of the transmission lines and the local Earth magnetic field. This experiment, suitable for a field trip, involves several abilities, such as modeling the magnetic field of power lines, looking up reliable information and estimating non-easily accessible quantities.

Апдейт в продолжение темы:

Using mobile-device sensors to teach students error analysis: https://arxiv.org/abs/2009.07049

Science students must deal with the errors inherent to all physical measurements and be conscious of the need to expressvthem as a best estimate and a range of uncertainty. Errors are routinely classified as statistical or systematic. Although statistical errors are usually dealt with in the first years of science studies, the typical approaches are based on manually performing repetitive observations. Our work proposes a set of laboratory experiments to teach error and uncertainties based on data recorded with the sensors available in many mobile devices. The main aspects addressed are the physical meaning of the mean value and standard deviation, and the interpretation of histograms and distributions. The normality of the fluctuations is analyzed qualitatively comparing histograms with normal curves and quantitatively comparing the number of observations in intervals to the number expected according to a normal distribution and also performing a Chi-squared test. We show that the distribution usually follows a normal distribution, however, when the sensor is placed on top of a loudspeaker playing a pure tone significant differences with a normal distribution are observed. As applications to every day situations we discuss the intensity of the fluctuations in different situations, such as placing the device on a table or holding it with the hands in different ways. Other activities are focused on the smoothness of a road quantified in terms of the fluctuations registered by the accelerometer. The present proposal contributes to gaining a deep insight into modern technologies and statistical errors and, finally, motivating and encouraging engineering and science students.

Comments

( 13 comments — Leave a comment )
istanaro
Jun. 13th, 2020 04:19 pm (UTC)
Интересная работа...
2born
Jun. 13th, 2020 04:25 pm (UTC)
Я пока только по диагонали глянул, но, повинуясь беличьему инстинкту, складирую у себя все, что может пригодиться:))
ahiin
Jun. 13th, 2020 06:21 pm (UTC)
Немедленно поставил себе на смартфон помнутый в статье Phyphox и яростно угораю. Там эксперименты десятками можно ставить, и поинтереснее описанного.
2born
Jun. 13th, 2020 06:36 pm (UTC)
А опубликуешь ли ты о них десятки статей? ;)
ahiin
Jun. 13th, 2020 06:39 pm (UTC)
Началось в колхозе утро...
Ну как минимум, я за выходные наиграюсь и буду рекомендовать. Прилада огонь просто.
2born
Jun. 13th, 2020 06:49 pm (UTC)
?? Я, наверное, неправильно тебя понял:)

С удовольствием почитаю твой обзор всего этого дела!
ahiin
Jun. 13th, 2020 06:51 pm (UTC)
Да ты зайди в гугловский Play Store на смартфоне, вбей в поиск Phyphox и установи. Программка просто космос, не пожалеешь.
2born
Jun. 13th, 2020 06:55 pm (UTC)
Начинаю!
2born
Jun. 13th, 2020 07:10 pm (UTC)
Ага, установил! Ну, магнитометра у меня, по всей видимости, нет, но и то, что есть, впечатляет. Осталось научиться пользоваться:)
ahiin
Jun. 13th, 2020 07:15 pm (UTC)
На моем есть и кухонная магнитная подставка под горячее, плотно прижатая к телефону, уверенно выжала из себя 10^-2 тесла. Могет!
2born
Jun. 13th, 2020 07:16 pm (UTC)
Ура!!! Но, блин, есть-таки польза от моего закапывания в арХив!
turova_varvara
Jun. 14th, 2020 01:20 pm (UTC)
То есть ходи по шпалам и принимай магнитотерапию?)
2born
Jun. 14th, 2020 01:31 pm (UTC)
:))) Нет, по мосту над жд:) Вообще, приложение к смартфону, которое они используют, действительно, весьма клевое (уже скачал и установил, теперь освоить надо:))
( 13 comments — Leave a comment )

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