National Repository of Grey Literature 203 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Využití přírodních hydroabsorbentů při mimokořenové výživě máku setého
Jelínek, Mojmír
The aim of this thesis was to evaluate the effect of a combination of foliar application of sulphur together with a natural form of superabsorbent polymers (SAP) in the spring poppy variety (Papaver somniferum L.) Onyx. The effect of sulphur application in the form of ammonium thiosulphate and elemental sulphur, both without SAP and in combination with SAP, on crop yield was investigated in a field experiment on a total area of 1.25 ha in the locality of Bedihošt' municipality. The evaluation of the effect was mainly based on hectare yield, then germination and thousand seed weight (HTS) were monitored, the health status of the crop was evaluated and an economic evaluation was made both in terms of total cost and with respect to the application of sulphur and SAP alone. The best results were obtained in the plot where ammonium thiosulphate alone was applied, followed by the combination of ammonium thiosulphate with SAP. The results show a very strong correlation between yield and germination (r = 0.96). In contrast, the effect of SAP was not sufficiently demonstrated in this work. The overall economic evaluation when all costs were included was positive only for the application of ammonium thiosulphate without SAP, all other options were loss making. In a direct comparison of the variants with the calculation of only the effect of sulphur and SAP, the application of ammonium thiosulphate without SAP and with SAP came out positive, while elemental sulphur with SAP and without SAP came out negative.
Czechoslovak Tourism in Socialist Yugoslavia. Institutions, Imaginations and Reality.
Jelínek, Martin ; Čechurová, Jana (advisor) ; Rychlík, Jan (referee)
International tourism has become a common part of human life. This phenomenon, originating in the modernization of society in the 19th century, has undergone a complex and long development. From its initial stages, when it was reserved for high society, through the understanding of its economic potential for the modern state and economy, to the final massification of international tourism in the second half of the 20th century. In a bipolar world, the specifics of the development of international tourism are shown with respect to which side of the Iron Curtain this tourism is developing on. A special example is if the development takes place somewhere on the border of both blocks. Czechoslovak tourism heading to Yugoslavia is a good example of blending the Eastern approach to traveling abroad with a specific model of the Yugoslav perspective on the phenomenon of tourism. Czech and Slovak tourists have been regular guests since the 19th century, heading precisely to the countries that made up the Yugoslav state. The presented work deals with how the institutionalization of Czechoslovak tourism in socialist Yugoslavia developed and was anchored, i.e. which institutions and in what way they ensured tourism, how and with which institutions on the Yugoslav side they were forced to cooperate and how this...
Making of the survey sketch in accordance with valid regulations for use in the land registry in district Brno-country
Wágner, Tomáš ; Jelínek, Milan (referee) ; Matějík, Miroslav (advisor)
This bachelor's thesis deals with the creation of a survey sketch for marking the perimeter of the building and changing the boundaries of the land. The work contains information about the location, the equipment used, the methods used in the measurement and other theoretical information related to the creation of survey sketches. The final output is a survey sketch with all the details, prepared according to valid decree no. 346/2022 Coll., amending decree no. 357/2013 Coll., on the real estate cadastre (cadastral degree). The survey sketch was prepared based on the real situation in the field and is suitable for confirmation by the relevant cadastral office.
Optical fibres for ionising radiation measurements
Zbožínek, Tadeáš ; Jelínek, Michal (referee) ; Mikel, Břetislav (advisor)
The work focuses on studying methods of measuring ionizing radiation using optical fibres. More attention is paid to their use, together with scintillation materials. The proposed method allows the connection of an electronic detector with a scintillation sensor by optical means. The interconnection provides the possibility of shielding the detector from the effects of high ionizing radiation activities. The shielded detector will thus not be subject to the adverse effects of this radiation and can be used even for long-term measurements of high activities. First experimental measurements of reference sources verify the principle of the proposed method and help to select the best choice for the type of optical fibre.
Fibre optic tapering and shaping methods for special applications
Hruška, Andrej ; Jelínek, Michal (referee) ; Mikel, Břetislav (advisor)
The thesis deals with the tapering of optical fibres and the shaping of their ends. The thesis describes the fibre tapering and shaping methods and compares them in terms of advantages and disadvantages. It mainly focuses on methods using electric arc, flame and chemical etching. The practical part of the work describes the methodology of fibre tapering for 125 m, 400 m and 1000 m fibre diameters and the methodology of fibre end shaping for 400 m and 1000 m fibre diameters.
Laser and fibre optic measurement systems for the nuclear power industry
Mikel, Břetislav ; Jelínek, Michal
At the Coherent Optics Department of the Institute of Scientific Instruments of the CAS, v. v. i. we have long been involved in optical and fibre optic technologies and measurement methods. Currently, we have experience in research and development of Bragg grating systems and sensors, laser interferometers and last but not least fibre optic sensors of ionizing radiation.
Optical fibre dosimeter
Jelínek, Michal ; Mikel, Břetislav
In the nuclear facility, there is currently a demand for optical methods of measuring gamma radiation. For these measurements, we need very robust measurement methods and sophisticated equipment. Silica optical fibres coupled to crystal scintillators are suitable and we present results from their implementation. The scintillators detect gamma radiation and the silica optical fibres transmit the scintillation light from the scintillator to the detector. We used commercially available silica optical fibres up to 1.5 mm in diameter with different numerical apertures to transmit visible light from the scintillators to the detector.
Highly-coherent laser for precise optical frequencies dissemination
Pravdová, Lenka ; Čížek, Martin ; Hrabina, Jan ; Jelínek, Michal ; Řeřucha, Šimon ; Mikel, Břetislav ; Lazar, Josef ; Havliš, O. ; Altmannová, L. ; Smotlacha, V. ; Vojtěch, J. ; Velc, R. ; Číp, Ondřej
The paper presents a multipurpose laser with a very narrow spectral line, operating at a wavelength of 1540 nm and designed for cooled ions spectroscopy and the dissemination of precise optical frequencies over optical fibre links. The optical frequency of a commercial single-mode laser (NKT Photonics Koheras Basik) is spectrally narrowed to the level of several Hz using a high-quality optical resonator as an optical reference and an acousto-optic modulator as an active control element. The optical resonator is made of a low length thermal expansion coefficient material and is placed in a multi-shell vacuum chamber providing a stable operating environment. Optical frequency stabilisation uses PDH (Pound-Drewer-Hall) modulation and detection technique.
Optical fiber sensors for critical infrastructures and their automatic remote calibration
Mikel, Břetislav ; Jelínek, Michal
In this paper, we present our results in designing and implementing fiber optic sensors with fiber Bragg gratings and their measurement systems. We are currently implementing these developed sensors and the measurement system to measure containments at the Temelín nuclear power plant. For this systém, we have also developed and adopted an approach for remote calibration of the measured wavelength over commercial telecommunication fiber optic cables.
Optical fibers for measuring ionizing radiation
Jelínek, Michal ; Mikel, Břetislav
Optical fiber ionising radiation measurements cannot be used to continuously measure high-energy ionising radiation, especially gamma radiation. Previously presented sensors and methods use optical fibers with a scintillator on/inside the fiber, optical fibers doped with a scintillator, etc. These methods are not suitable for measuring high-energy radiation mainly due to low efficiency. Therefore, we present a measurement method where optical fibers are used only to transport the scintillation radiation to the shielded detection electronics.

National Repository of Grey Literature : 203 records found   1 - 10nextend  jump to record:
See also: similar author names
29 JELÍNEK, Martin
6 Jelínek, Marek
3 Jelínek, Marian
29 Jelínek, Martin
1 Jelínek, Matěj
8 Jelínek, Michael
13 Jelínek, Michal
2 Jelínek, Milan
6 Jelínek, Miroslav
2 Jelínek, Mojmír
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