Search results for "Day"

Studies of electron heating on a 6.4 GHz ECR ion source through measurement of diamagnetic current and plasma bremsstrahlung

2011

Diamagnetic current and low energy (2–70 keV) x-ray bremsstrahlung measurements taken on a 6.4 GHz electron cyclotron resonance ion source (ECRIS) are presented as a function of microwave power, neutral gas pressure and magnetic field configuration. X-ray flux from confined electrons and plasma energy density depend logarithmically on microwave power. This result differs from previous studies performed on ECRISs that operate at higher microwave frequencies, in which the x-ray power increases in an essentially linear fashion with the microwave power. X-ray power and plasma energy density both saturate as the neutral pressure is increased beyond a certain value. The gradient of the magnetic f…

Pollutants in indoor environments

2014

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Ion motion in salt water flowing under a transverse magnetic field

2012

The problem of ion motion in an electrolyte solution flowing in a thin rectangular duct with velocity VE in the presence of a transverse magnetic field B0 is studied by means of classical mechanics and electrodynamics. Because of Lorentz force on the ions in the electrolyte solution, a so called Faraday voltage appears at the electrodes orthogonal to both the field B0 and the velocity VE. The dynamics of positive and negative ions (cations and anions, respectively) in this classical system is studied by taking into account the viscosity of the fluid and the process of charge accumulation on the opposite walls of the duct. Hydrogen production is seen to take place at one of the electrodes wh…

Experimental PHY/CHE: Class teachers’ experiences of experimental natural science lessons

2013

The LUMA Centre of Central Finland (LUMA-KS) is a development project coordinated by the Faculty of Mathematics and Science of University of Jyväskylä. LUMA-KS is part of the National LUMA network, and its aim is to support and promote the learning, studying, and teaching of natural sciences, mathematics, computer sciences, and technology on all levels of education, especially in the region surrounding University of Jyväskylä.
 The goal is to help children and youth to see the general significance of mathematics, natural sciences, and information technology behind the modern society and in everyday life. One of the essential parts is to promote study and career options in the fields of…

Live Action Role Play and the Development of Teacher Competences: Evaluation of “Everyday Life in the Classroom”

2016

Building on Dörner’s (1996) theory of complex problem-solving, a learning scenario for teacher students was created and tested. Classroom management is interpreted as a complex problem, which requires the integration of competing interests and tackling multiple, simultaneous tasks under time pressure and with limited information. In addition, rising emotions are likely to impede thinking and the quality of decision-making. To prepare student teachers to understand and reflect the complex problem-solving challenges inherent in classroom management, we developed the live action role play “Everyday Life in the Classroom” which was embedded in a seminar structure to guide the development of ana…

Classroom Management and Loss of Time at the Lesson Start: A Preliminary Study

2013

<p style="text-align:justify">Lesson starts are transitional events which may cause management problems for teachers. In this study 131 lesson starts of equally many teachers were observed in primary and secondary schools in Finland. The results indicated that, in general, the problems were minimal. However, for various reasons lesson starts were delayed by an average of about six minutes. Calculated on this basis, the total loss of instructional time in the whole school year was about five weeks of schooling. No statistically significant relationships were observed between disturbances in the classroom and any background variable studied including grade level, classroom type,(special…

Millstone coastal quarries of the Mediterranean: A new class of sea level indicator

2014

The coasts of Italy still preserve several remnants of coastal quarries built in antiquity, that now provide insights into the intervening sea-level changes occurred during the last millennia. In this paper, we show and discuss a new class of sea level indicator consisting of millstones carved along the rocky coast of southern Italy since 2500 BP, that are currently submerged. They were extracted from beachrocks, sandstones or similar sedimentary rocks, easier for carving by ancient carving tools. Our study focuses on 10 coastal sites located at Capo d'Orlando, Avola, and Letojanni, in Sicily; Soverato, Tropea, and Capo dell'Armi, in Calabria; Castellabate, Palinuro, and Scario, in Campania…

1993

One of the first difficulties encountered when trying to understand evolution is the concept of geological time, for which we have no comparison in everyday life.

Day-to-day routines of media platform use in the digital age: A structuration perspective

2020

Using Giddens's structuration theory, this study examines how the routinized use of traditional and new media platforms differently align with the structures of everyday life. We analyzed data from a quantitative diary study in Germany to find that new media platforms specifically affect societal structuration by blurring the lines between obligations and leisure time. The part played by routines in the use of new media platforms was less strongly connected to clock time compared to traditional media platforms. Consequently, the findings indicate both a vanishing potential for media platform use as a social zeitgeber and the relevance of rules as structuring elements.

Seasonal and daily variation in physical activity among three-year-old Finnish preschool children

2013

The purposes of this study were to assess seasonal, daily, and gender variations in children’s physical activity (PA). ActiGraph GT3X accelerometers were used to record the three-year-old children’s PA levels for five consecutive days in autumn and winter. Complete data for both seasons were obtained for 47 children. Despite a significant difference in seasonal temperatures (p < .001), differences were only found for weekdays light PA (p = .021). No difference in PA was observed between weekdays and weekend days. Only 20% of the sample had ≥120 minutes light-to-vigorous PA (LMVPA), and 46% of children had ≥60 minutes moderate-to-vigorous PA (MVPA). Boys spent more minutes in LMVPA (p = .001…