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Assessment of dendrometric parameters of small forest property from economic point of view
Havlíček, Josef ; Urbánek, Vilém (advisor) ; Tipmann, Lubomír (referee)
This paper is about the extraction of and working with basic dendrometry and
stand values. The data collection was
performed on two stand groups. One group was measured with full
calipering while the other group was measured with the method of trial
surface. An Electronic Digitech Professional was used to measure the
thickness and it's comparison with the heights of the trees. A Hypsometer
Vertex Laser was used to obtain information about the height of the trees. A
GPS compatible with the software TIMS was used to acquire information about
the surface. The data was evaluated with the software caliper LCRTax, with
the application Calliper, as well as with mass
value tables ULT. The data was then compared with the available data of the
interim separate of the forestry outlines for the years
2016 to 2025. Based on the enumerated results, this paper further suggests
agricultural measures to be taken within the area of study.
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Global Power Balance in Non-Stationary Discharge Phases in the COMPASS Tokamak
Havlíček, Josef ; Imríšek, Martin ; Kovařík, Karel ; Weinzettl, Vladimír
The global power balance between different input power and sink/loss channels is important for understanding of tokamak physics, particularly for various scaling laws. The power balance is measured easily during stationary discharge phases because the terms for both magnetic field energy and plasma thermal energy build-up can be neglected. However, many important events in tokamak plasmas occur during non-stationary phases of the discharge. This article describes, quantifies and discusses the terms of the global power balance, including time dependent parts, and exemplifies them on the typical ohmic discharge of the COMPASS tokamak.
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Design and Preliminary Results of the COMPASS Power Supplies Filters
Havlíček, Josef ; Zajac, Jaromír
The COMPASS tokamak uses rectifying thyristor converters as Power Supplies for the major slow coils circuits. 24-pulse thyristor converter is used for Toroidal Field circuit and 12-pulse converters are used for Magnetizing, Equilibrium and Shaping Field circuits. A noise generated by the switching of the converters negatively influences diagnostics measuring the plasma. The article describes design phase and some preliminary results of the filters for the Power Supplies
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Observation of Sawtooth Oscillations in the COMPASS Tokamak
Imríšek, Martin ; Havlíček, Josef ; Weinzettl, Vladimír ; Mlynář, Jan
The sawtooth instability in tokamak plasmas results in periodic relaxations of the core plasma density and temperature. The physics of sawtooth is still not fully understood. It is predicted that fusion-born alpha particles will lead to long sawteeth. However, longer sawteeth can seed other instabilities which cause further degradation of plasma confinement. This paper provides brief introduction into sawtooth physics and observations of sawtooth instability in COMPASS. Furthermore, evidence of triggering transition to high confinement regime by sawtooth crash is presented
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