AbstractŘeháček D., Khel T., Kučera J., Vopravil J., Petera M. (2017): Effect of windbreaks on wind speed reduction and soil protection against wind erosion. Soil & Water Res., 12: 128−135.Windbreaks form efficient soil protection against wind erosion particularly at the time when soil cover is not protected by the cultivated plant vegetation cover. The objective of this research was to evaluate windbreaks efficiency in terms of wind speed reduction. Wind speed along the windbreaks was measured in the cadastral areas of Dobrovíz and Středokluky (Czech Republic, Central Europe). The measurement was carried out by 4 stations placed at windward side (1 station at the distance of 3 times the height of the windbreak) and at leeward side of the windbreak (3 stations at the distance of 3, 6, and 9 times the height of the windbreak). Each station contained 2 anemometers situated 0.5 and 1 m above surface. The character of windbreak was described by terrestrial photogrammetry method as the value of optical porosity from the photo documentation of the windbreak at the time of field measurement. A significant dependence between the value of optical porosity and efficiency of windbreak emerged from the results. The correlation coefficient between optical porosity and wind speed reduction was in the range of 0.842 to 0.936 (statistical significance more than 95%). A significant effect of windbreak on airflow reduction was proven on the leeward side of windbreak in a belt corresponding to approximately six times the height of the windbreaks depending on the optical porosity and it was expressed by a polynomial equation.

The aim of this paper is to introduce LinCAN, a CAN driver system for Linux, developed at the Department of Control Engineering of the Czech Technical University in Prague, and to provide a thorough comparison with SocketCAN, which is the most common CAN solution for Linux nowadays. Thorough timing analysis and performance comparison with Socket CAN are presented, with several case-studies and applications of LinCAN shown in the end. LinCAN has been developed since 2003 and supports many CAN controllers from various manufacturers. It is designed with emphasis on strict real-time properties and reliability, making it ideally suitable for networked control systems (as is also demonstrated in the case-studies). LinCAN is also portable to other Operating Systems and can be used even system-less (without any OS) on less-powerful microcontrollers.A timing analysis and performance tests of both drivers were performed using various types of load with several recent Linux kernels. Obtained results indicate that LinCAN seems better suited for hard real-time applications, its performance being either better or on-par with SocketCAN in presented tests.Both LinCAN and SocketCAN drivers are completely opensource as well as our testing tools, so any researcher interested in our results is welcome to download all relevant source codes, check our testing methodology in detail and perhaps recreate our results or extend them by performing other test, providing valuable feedback and independent verification of our work.

Windbreaks create efficient soil protection against wind erosion particularly at the time when soil cover is not protected by vegetation cover of cultivated plant. The objective of this research was to find correlation between qualitative parameters of windbreaks and their efficiency in terms of wind speed reduction. The wind speed measurement was carried out by 4 stations along windbreak. The station contains 2 anemometers at heights 0.5 and 1 m above the surface. The character of windbreak was described by photogrammetry method as the value of optical porosity from the photo documentation of the windbreak at the time of ambulatory measurement. Important dependency between the value of optical porosity and efficiency of windbreak emerged from the results. An important protective effect of windbreak on soil was proven on the leeward side of the windbreak in the belt corresponding with approximately six times the height of the windbreaks.