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1.
Bora wind, Wind speed vertical profile, Logarithmic law, Power law
Marija Bervida, Samo Stanič, Klemen Bergant, 2018, published scientific conference contribution

Abstract: Bora is cold and gusty downslope wind with variable gust frequency and duration, appearing on the lee side of Dinaric Alps. Its flow characteristics are unique and theoretically still not fully described, especially for modeling purposes. We present an analysis of the wind speed vertical profiles at Razdrto, which lies in a gap between the Nanos and Javorniki plateau in southwest Slovenia and is strongly exposed to Bora. An analysis of the vertical wind speed profiles during Bora episodes is based on experimental wind data, provided by Helikopter energija, for six Bora events of different duration, appearing between April 2010 and May 2011. Average wind speed in 10-minute intervals was collected at four different heights (20, 31, 40 and 41.7 m above the ground)at the wind turbine site in Razdrto using cup anemometers. Wind direction data with same temporal resolution was obtained from a single wind vane placed at 40.9 m above the ground. Based on the collected data, the applicability of the empirical power-law and the logarithmic law profiles, commonly used for the description of neutrally stratified atmosphere, was investigated for the case of Bora. The parameters for the power-law and logarithmic law were obtained by fitting the wind speed data using linear regression method and are compared to standard values for that particular type of terrain. The quality of fits was very good with r2 above 0.9, indicating that both power-law and logarithmic law adequately describe mean horizontal Bora wind. The median value of the power-law coefficient was found to be 0.16±0.03, which is consistent with standard value for neutral atmosphere (0.143). The aerodynamic roughness varied from 0.003 m to 0.22 m with the median value of 0.09±0.07, which describes open level country terrain with some trees. The event in November 2010 with large roughness is expected to be due to specific wind direction and surface conditions.
Keywords: Bora wind, Wind speed vertical profile, Logarithmic law, Power law
Published in RUNG: 07.02.2019; Views: 3906; Downloads: 27
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2.
About Time
Una Rebić, 2016, master's thesis

Abstract: The practical work of my master project about time was carried out as processbased experiments in practice. As a result, the thesis is a combination of theoretical research taken from several fields—examining the notion of time from perspective of psychology, sociology, science and spirituality. Alongside mentioned research the thesis pairs artistic practices associated with each field discussed— considering most significant artist and his/her practice or project(s) in which they explore time. The third layer of the thesis pairs each section with my own personal practice through experiments carried out in the process—each exploring time from a different perspective. Since the thesis is the final project of the study developed within a certain time frame, the last chapter discusses how I approached this project in regard to my artistic practice.
Keywords: time, perception, On Kawara, sociology, speed, Hamish Fulton, quantum entanglement, arrow of time, Hiroshi Sugimoto, spirituality, consciousness, Marina Abramović, Ulay
Published in RUNG: 14.09.2016; Views: 4592; Downloads: 1
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