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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Thermal requirements for plant development
 Chuchvalcová, Lucie ; Skálová, Hana (advisor) ; Jarošík, Vojtěch (referee)
Plant development is strongly influenced by temperature. Other factors affect plant development to smaller extent. Plant development is affected by rate of enzymatic reactions which depend on temperature surrounding plant. Temperature and time are integrated into thermal time which is defined as sum of temperatures above temperature at which development ceases which is called base temperature. Cardinal temperature at which is the rate of plant development highest is called optimal temperature. When temperature exceeds optimum temperature rate of plant development, rate of development diminishes in higher rate than it increased between base and optimum temperature. Thermal time is mostly being used in agriculture for rate of development prediction, for optimizing crop yield, for prediction of particular developmental stage of weeds. There are also works that focus on wild plants. The easiest way to study temperature effect on plant development is to study leaf development. Rate of leaf appearance on the main stem and its reciprocal called phyllochron (duration separating appearance of two successive leaves) are plant development characteristics most frequently used. Use of thermal time instead of calendar days improved considerably prediction of plant phenological events. The goal of this bachelor thesis was...
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Study of the coal oxidation temperature dynamics
 Taraba, B. ; Peter, R. ; Slovák, V. ; Janek, Jiří ; Dušková, Anežka
Temperature dependence of coal oxidation rate was investigated between 30°C and 160°C using air flow reactor and/or methods of inverse gas chromatography, pulse flow calorimetry and thermogravimetry. As a parameter quantifying the temperature dynamics of coal oxidation, values of activation energy E were calculated from Arrhenius plots (Ln (oxidation rate) versus Reciprocal temperature). These E values were found to vary between 28 and 57 kJ/mol. Moreover, non-linear course of the Arrhenius plots was confirmed with breaks at temperatures between 45°C and 120°C. The break was denoted as threshold temperature Tth and its value indicates a temperature beyond which the coal oxidation gains more intense disposition. Based on the experimental results, reason of the change in coal oxidation process at the Tth temperature was revealed to be chemical in character.
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