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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Solar wind variability close to the Lagrange L1 point
 Drastichová, Kristýna ; Němec, František (advisor) ; Gončarov, Oleksandr (referee)
In the near future, the European space agency (ESA) is planning a space mission with objective to detect gravitational waves in the frequency range 10-4 Hz - 10-1 Hz (LISA mission). The detection of the gravitational waves is going to be carried by three spacecraft acting like a large interferometer. Omnipresent solar wind plasma could have a negative impact on the measurements. In this thesis, we analyze the temporal and spatial varibility od the solar wind near the Lagrange point L1. Both single-point and two-point measurements provided by several different spacecraft (Wind, ACE, STEREO) are used to determine the appropriate spatial and temporal scales.
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Influence of Fe substitutions on tranformation temperatures in Ni2MnGa alloys
 Drastichová, Kristýna ; Klicpera, Milan (advisor) ; Prchal, Jiří (referee)
In this bachelor thesis we are interested in studying the properties of Ni2MnGa alloy and their development with the other element substitution, for example with iron. Overally, we were studying five samples with four different compositions described by the formula Ni50Mn 25Ga25-xFex where the concentration of iron was in the interval . Consequently we performed on the prepared single crystals an extensive characterization by the methods of x-ray and electron diffraction, differential scanning calorimetry and dilatometry. Special emphasis was devoted to measuring the magnetization with vibrational magnetometer. The obtained data enabled us to confirm the quality of the prepared single crystals and to observe a development of Ni2MnGa properties, especially the temperatures of the phase transformations.
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