scholarly journals Mechanics of side-slipping in alpine skiing. Braking and skidded traversing

2021 ◽  
Vol 24 (1) ◽  
Author(s):  
Serguei S. Komissarov
Keyword(s):  
Field Studies ◽  
Approximate Theory ◽  
Alpine Skiing ◽  
Rigorous Testing ◽  
Fall Line

AbstractA recently proposed simple approximate theory of snow machining is applied to modelling of several basic manoeuvres of alpine skiing: fall-line side-slipping, traversing, and hockey stop. The results agree with the skiing practice and explain the abnormally high friction reported in previous field studies. They also prepare foundation for future rigorous testing of the theory, which will determine its accuracy and limits of applicability.

scholarly journals Dynamics of carving runs in alpine skiing. I.The basic centrifugal pendulum.

2019 ◽  
Author(s):  
Serguei Komissarov
Keyword(s):  
Simple Model ◽  
Centrifugal Force ◽  
High Speed ◽  
Inverted Pendulum ◽  
Vertical Position ◽  
Alpine Skiing ◽  
Supercritical Regime ◽  
Current Form ◽  
Speed Regime ◽  
Fall Line

We studied perfect carving turns of alpine skiing using the simple model of an inverted pendulum which is subject to the gravity force and the force mimicking the centrifugal force emerging in the turns. Depending on the turn speed the model describes two different regimes. In the subcritical ( low speed) regime, there exist three equilibrium positions of the pendulum where the total torque applied to the pendulum vanishes -- the marginally stable vertical position and two unstable tilted positions on both sides of the vertical. The tilted equilibria correspond to the ski turns executed in perfect balance. The vertical equilibrium corresponds to gliding down the fall line without turns. In the supercritical (high speed) regime, the tilted equilibria disappear. In addition to the equilibria the model allows fall-rise solutions, where the pendulum (skier) hits (rises from) the ground, and oscillations about the vertical. These oscillations correspond to the so-called dynamic skiing where the skier never settles to a balanced position in the turn. Analysis of the available data on FIS WC races shows that elite races ski mostly in the supercritical regime. In its current form the model of centrifugal pendulum has no feedback components associated with the skier control over their runs and therefore describes a riderless mono ski. Hence the theory predicts that such a vehicle can execute carving turns automatically.

scholarly journals Snow machining and side slipping in alpine skiing

2020 ◽  
Author(s):  
Serguei Komissarov
Keyword(s):  
Laboratory Experiments ◽  
Approximate Theory ◽  
Alpine Skiing

A simple approximate theory of snow machining is developed and tested against the results of past laboratory experiments. It is also applied to side-slipping and traversing in alpine skiing, and yields realistic predic- tions which can be tested experimentally on real ski slopes. Eventually, the theory could be used in modelling of skiing turns involving the phaseof skidding.

scholarly journals Mechanics of wedge turns in alpine skiing

2020 ◽  
Author(s):  
Serguei Komissarov
Keyword(s):  
Coefficient Of Friction ◽  
Experimental Investigations ◽  
Approximate Theory ◽  
Alpine Skiing ◽  
The Coefficient Of Friction

A simple approximate theory of snow machining is applied to modelling successive wedge turns of alpine skiing. The results are in agreement with available experimental investigations of such turns. In particular, the model explains the abnormally high values for the coefficient of friction reported in these studies.

Empty visual field studies: Some effects of corrective lenses, filters, and structure.

1964 ◽  
Author(s):  
Milton S. Katz ◽  
Paul A. Cirincione ◽  
William Metlay
Keyword(s):  
Visual Field ◽  
Field Studies

Vocal signaling among male northern elephant seals: Behavioral field studies of honesty vs. associative learning

2012 ◽  
Author(s):  
Colleen Reichmuth ◽  
Caroline Casey ◽  
Isabelle Charrier ◽  
Nicolas Mathevon ◽  
Brandon Southall
Keyword(s):  
Associative Learning ◽  
Field Studies ◽  
Elephant Seals ◽  
Northern Elephant Seals ◽  
Vocal Signaling

Penggunaan Media Pembelajaran Berbasis Android untuk Meningkatkan Hasil Belajar Kognitif Siswa

2019 ◽  
Vol 5 (2) ◽  
pp. 104-111
Author(s):  
Dian Puspita Eka Putri
Keyword(s):  
High School Students ◽  
Learning Outcomes ◽  
Multimedia Learning ◽  
Cognitive Learning ◽  
Field Studies ◽  
Research Subjects ◽  
School Students ◽  
Increase Student Achievement ◽  
Post Test ◽  
Test Result

This study aims to review  the effectiveness of using android-based multimedia learning  to improve achievement cognitive learning outcome of students. The research method is the analysis of field studies. The focus in this research is Multimedia which can influence cognitive learning outcomes of students. data obtained in this study from the literature and direct field observations. The research subjects were high school students in Yogyakarta. The result of analysis and discussion of research indicate that there is the influence of multimedia learning to increase student achievement, which is indicated by increasing post-test result  than before  not using multimedia learning. Posttest value is greater than pretest.

Ligand Field Studies on the Reinecke-Type Complexes with Aniline and Benzylamine

1971 ◽  
Vol 74 (1_2) ◽  
pp. 11-16 ◽  
Author(s):  
I. Gănescu ◽  
Margareta Teodorescu ◽  
C. I. Lepădatu
Keyword(s):  
Field Studies ◽  
Ligand Field

Motor Coordination and Reactivity Influenced by Mental Training in Alpine Skiing

2016 ◽  
Author(s):  
Vlad Teodor Grosu ◽  
Emilia Florina Grosu ◽  
Cristina Elena Moraru
Keyword(s):  
Motor Coordination ◽  
Alpine Skiing ◽  
Mental Training
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