National Repository of Grey Literature 305 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Differentiable Depth Estimation for Bin Picking
Černý, Marek ; Klusáček, David (advisor) ; Šikudová, Elena (referee)
The goal of this thesis was to investigate the neural 3D surface reconstruction from multiple views with the intent to use the resulting depth maps for bin picking. Survey of papers from 2014 to 2018 showed that none of the state of the art methods would be used to control a robot arm in our setup. Therefore we decided to create our low-level neural approach which we called the EmfNet. The network is based on a pyramidal resolution refining approach. At each pyramid's layer, there are three separate networks that take part in the computation. Each of them has a definite goal, which gives us almost complete understanding of what is going on inside the network. The EmfNet model was partially usable, but we nevertheless extended it to EmfNet-v2. First, another measuring layer was added, which freed EmfNet from depending on an unnecessary hyperparameter. Second, we used constraints on geometry for the network not to be confused by occlusions (cases where a certain part of the surface is visible only from a single camera). Both networks were implemented and tested on a corpus that was created as a part of this thesis. A corpus containing rendered as well as real data. The process of correspondence pairing inside the network can be observed using the visualization tool. We designed a way how to use a robotic arm...
Factors affecting the metacommunity structure of major freshwater invertebrate groups
Nagy, Alexander ; Juračka, Petr Jan (advisor) ; Černý, Martin (referee)
Freshwater organism communities are dependent on the ability of dispersion among habitats through inhospitable terrestrial environment. Therefore, these organisms have developed a variety of dispersal mechanisms. Some species are able to overcome barriers via active dispersion, but most freshwater invertebrates are passive dispersers, depending on abiotic or biotic vectors. Abiotic vectors are e.g., wind or floods, while biotic vectors are other animals such as birds. By linking several locations with dispersion, and thus with a gene flow, a meta- community is created. This is influenced by many factors, including habitat abiotic conditions, especially altitude, and biotic interactions, such as competition and predation. Freshwater invertebrate communities are very complex and influenced by many factors with varying degrees of influence.
Determination of the mechanical properties of materials used for 3D printing
Černý, Martin ; Sliwková, Petra (referee) ; Sedlák, Josef (advisor)
The thesis deals with the determination of mechanical properties of materials used for 3D printing (ABS, nylon and PLA). Standardized samples produced using a 3D printer using the Fused Deposition Modeling method were subsequently used for mechanical testing. The work is also extended to determine the mechanical properties of samples made by Soft Tooling. For the production of Soft Tooling samples, polyurethane resins SG 2000 and SG 145 were used. Individual materials were analyzed by mechanical tests (tensile test and hardness test). Surface integrity parameters have also been determined for 3D-printed materials. Parameters were selected from the individual tests (tensile strength, modulus of elasticity) ductility and hardness), which were subsequently statistically processed. The work is concluded by evaluating the results obtained, which were compared with the values given in material sheets.
Production of "flange" components on CNC machines
Černý, Marek ; Trčka, Tomáš (referee) ; Kalivoda, Milan (advisor)
This bachelor thesis deals with the production of flange type components on CNC machines. The flange function in the tank assembly is described here. The work includes choice of material, choice of semifinished product and proposal of machinery for production. Also, there is a technological process and NC programs for various control systems. Finally, a prototype is produced, which is then evaluated.
Design of the experimental PV tracker
Černý, Martin ; Baxant, Petr (referee) ; Morávek, Jan (advisor)
The aim of this thesis is to design, show plans and build two devices for positioning the solar panel. The output of the work is a technical documentation with a list and procedure of assembly. The thesis also includes economic cost evaluation.
The Role of Bi/Material Interface in Integrity of Layered Metal/Ceramic
Masini, Alessia ; Černý, Martin (referee) ; Bermejo, Raul (referee) ; Chlup, Zdeněk (advisor)
The present doctoral thesis summarises results of investigation focused on the characterisation of materials involved in Solid Oxide Cell technology. The main topic of investigation was the ceramic cell, also known as MEA. Particular attention was given to the role that bi-material interfaces, co-sintering effects and residual stresses play in the resulting mechanical response. The first main goal was to investigate the effects of the manufacturing process (i.e. layer by layer deposition) on the mechanical response; to enable this investigation, electrode layers were screen-printed one by one on the electrolyte support and experimental tests were performed after every layer deposition. The experimental activity started with the measurement of the elastic characteristics. Both elastic and shear moduli were measured via three different techniques at room and high temperature. Then, uniaxial and biaxial flexural strengths were determined via two loading configurations. The analysis of the elastic and fracture behaviours of the MEA revealed that the addition of layers to the electrolyte has a detrimental effect on the final mechanical response. Elastic characteristics and flexural strength of the electrolyte on the MEA level are sensibly reduced. The reasons behind the weakening effect can be ascribed to the presence and redistribution of residual stresses, changes in the crack initiation site, porosity of layers and pre-cracks formation in the electrode layers. Finally, the coefficients of thermal expansion were evaluated via dilatometry on bulk materials serving as inputs for finite elements analyses supporting experiments and results interpretation. The second most important goal was to assess the influence of operating conditions on the integrity of the MEA. Here interactions of ceramic–metal interfaces within the repetition unit operating at high temperatures and as well at both oxidative and reductive atmospheres were investigated. The elastic and fracture responses of MEA extracted from SOC stacks after several hours of service were analysed. Layer delamination and loss of mechanical strength were observed with increasing operational time. Moreover, SEM observations helped to detect significant microstructural changes of the electrodes (e.g. demixing, coarsening, elemental migration and depletion), which might be responsible for decreased electrochemical performances. All the materials presented in this work are part of SOC stacks produced and commercialised by Sunfire GmbH, which is one of the world leading companies in the field.
Monge property for interval matrices
Černý, Martin ; Hladík, Milan (advisor) ; Zimmermann, Karel (referee)
The thesis is a first survey in the field of interval matrices with Monge prop- erty. We investigate characteristics and properties of two classes of matrices - interval strong and interval weak Monge matrices. We develop a recognition and reconstruction algorithms and study applications in combinatorial problems and in a problem connected with computational geometry.
European catfish (Silurus glanis, Linneus 1758): Is the global warming the main reason of increasing of catches of the largest freshwater predator in Europe?
Bakeš, Michal ; Čech, Martin (advisor) ; Černý, Martin (referee)
European catfish (Silurus glanis, Linneus 1758) is our only fish which amount of catch is growing in our country in the last thirty years. The main goal of my work is to find out if global warming is essential for increasing catch of catfish, or whether rising temperatures are marginal, and the main reason is growing focus of fishermen on catfish. This thesis summarized knowledge about effect of global warming on ecosystems mainly on freshwater bodies that seem to be the most influenceable among terrestric ones. The enlarging populations of catfish in countries of south Europe (e.g. Spain, Italy) where catfish was recently introduced can be explained by the fact that warm water is suitable for catfish. However, some socioeconomic studies carried out in the Czech Republic as well as abroad clearly demonstrate that popularity of catching of catfish increases in time. I verified this idea by the results of my questionnaire survey, where 82 % of respondents approved that the popularity of catfish among fishermen is highest in the last decade. Based on the evidence we can say that increasing temperatures has a positive effect on the metapopulation of catfish in the Czech Republic, but this influence seems to be marginal. The main reason for still increasing catch is very likely the change of preferences...
Importance of UV perception for dragonflies (Odonata)
Jačmeněv, Vjačeslav ; Černý, Martin (advisor) ; Stella, David (referee)
It has long been known that some animals are able to perceive radiation at other wavelengths than perceive we humans. In dragonflies, UV sensitivity has been demonstrated in the 1974, however a recent study has unveiled an extraordinary diversity of genes of specific photoreceptor proteins known as opsins, including UV-sensitive opsin. In addition some dragonflies have coloration on their body and wings, which can reflect UV radiation at unchanged wavelength - UV reflectance. Very little is known about the use of UV in dragonfly life. My thesis summarizes the current knowledge of the importance of UV for dragonflies, focusing on interspecific and intraspecific communication.
Assessment of the suitability of the site for the location of the underground\nof SNF and RAW repository in terms of long-term safety - Horka site
Havlová, V. ; Pertoldová, J. ; Bukovská, Z. ; Hroch, T. ; Štědrá, V. ; Uhlík, J. ; Říha, J. ; Červinka, R. ; Baier, J. ; Buriánek, D. ; Černý, M. ; Dudková, I. ; Dušek, K. ; Franěk, J. ; Gondolli, J. ; Hokr, M. ; Holeček, J. ; Jankovec, J. ; Jelének, J. ; Jelínek, J. ; Kachlíková, R. ; Kaláb, Zdeněk ; Klajmon, M. ; Kolomá, K. ; Kouřil, M. ; Královcová, J. ; Kučera, R. ; Kunceová, E. ; Maryška, J. ; Milický, M. ; Nývlt, D. ; Ondra, P. ; Pacherová, P. ; Polák, M. ; Rapprich, V. ; Rukavičková, L. ; Steinová, J. ; Svoboda, J. ; Šír, P. ; Švagera, O. ; Vašíček, R. ; Vavro, Martin ; Vopálka, D. ; Zeman, J. ; Zeman, O.
This report summarises outline of a report for evaluation of the sites‘ suitability for the emplacement of a deep geological repository on the basis of the archive information and the geological survey conducted from surface.\nSites are evaluated according to the following criterion categories\n1. Geological characteristics of the site\n2. Hydrogeologic characteristics of the site\n3. Transport characteristics of the the site\n4. Site stability\n5. Factors, increasing probability of human intrusion into the site\n6. Acceptability of enginnered barrier properties under site conditions

National Repository of Grey Literature : 305 records found   1 - 10nextend  jump to record:
See also: similar author names
26 ČERNÝ, Michal
14 ČERNÝ, Miroslav
2 Černý, M.
9 Černý, Marcel
5 Černý, Marek
2 Černý, Marian
71 Černý, Martin
10 Černý, Matej
2 Černý, Matouš
10 Černý, Matěj
4 Černý, Michael
26 Černý, Michal
1 Černý, Milan
2 Černý, Miloslav
3 Černý, Miloš
14 Černý, Miroslav
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