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Molecular simulations of water - rutil interface
Hanke, Hynek ; Předota, Milan (advisor) ; Lísal, Martin (referee)
Study of structural and particularly dynamical properties of the interface of water with graphite and rutile surfaces points towards anomalous behavior of water molecules close to solid matter. Evaluation of statistical properties like translational and rotational diffusivity, residence times and autocorrelation functions of orientation vectors indicates that the translation and rotation of water molecules can be not only hindered, but also facilitated, according to the particular local density, interactions and and geometrical structure of the surface. The newly developed methods for the measurement of statistical rotational properties near to liquid-solid boundary overcomes the difficulties that are closely related to the measurement of dynamical properties in strongly inhomogeneous environment in a way, that can be applied to other model systems of this type.
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Measurement and analysis of postural stability and movement patterns of persons after transfemoral amputation
Vyhnal, Ondřej ; Prokešová, Eva (advisor) ; Majorová, Simona (referee)
Title: Measurement and analysis of postural stability and movement patterns of persons after transfemoral amputation. Objectives: The aim of this work is to understand the compensatory mechanisms arising after femoral amputation and to find out what effect the lenght of amputation has on movement patterns in humans after transfemoral amputation and exarticulation in the knee joint. Methods: In my work I used the method of analysis and method of comparison. For the analysis of postural stability, I used standard tools: force plates (Kistler 9286A) and motion recording system (Kistler 9286A). To compare kinematic one-dimensional data, I used the technique of statistical parametric mapping, which is a generalization of classical statistical tests from scalar to one-dimensional data. 8 probands with transfemoral amputation participated in the study. Three successful attempts were recorded, at three speeds with the contact of a residual and amputated limb. The movement of the pelvis in the horizontal, sagittal, transverse planes and the time spent on a residual limb were analyzed. Results: We found that the length of amputation significantly effects postural stability and movement patterns. It was found that the shorter the amputation stump, the less stable the gait, with greater deviations in the...
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Multipoint identification of position and orientation of object
Řičánek, Dominik ; Ligocki, Adam (referee) ; Burian, František (advisor)
The goal of this paper is to find a good method to determine the pose of two, mutually rotated, objects and to try and implement it first in C++ without the usage of any external libraries and then in Kuka Robot Language (KRL). First we are going to look at two different approaches to solving this problem: The Iterative Closest Point algorithm (ICP) and the Kabsch Algorithm. From them one is going to be chosen and a program will be build around it. Following its implementation, the algorithm’s precision is going to be tested. Finally KRL will be briefly introduced and the various problems involving transition of the algorithm from C++ to KRL will be talked about.
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Laterality in social and locomotory behaviour of domestic pigs (Sus scrofa f. domestica)
Kunclová, Kristýna ; Špinka, Marek (advisor) ; Nekovářová, Tereza (referee)
The aim of this diploma thesis is to find out whether pigs exhibit laterality in social behavior, especially the laterality of rotational movements in game behavior and social interactions. We aimed also to explore how this laterality is influenced by other factors, especially the possibilities of playful behavior in ontogenesis, personality and others social and non-social factors. Alternatively, whether the degree of laterality determined varies depending on the social situation (game / aggression) and whether is influenced by the litter. I have investigated this behavior for 64 pigs in 16 litters from videotapes of their social behavior. For each pig, I recorded the playing element and the preferential side. For individual game elements I did not find any preference for rotation at the population level and only a slight tendency for individual laterality. For social game elements, I have shown a weak population tendency to prefer left side, but only for a group of more playing pigs. The main contribution of this work is the symmetry found in the implementation of individual game elements and, on the contrary, the observed laterality at the population level for social game behavior. Since the laterality of playful behavior has not yet been investigated, it is possible that this symmetry is...
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3D scene reconstruction using Clifford algebras
Hrubý, Jan ; Návrat, Aleš (referee) ; Hrdina, Jaroslav (advisor)
Tato diplomová práce má za cíl seznámit čtenáře se stále ještě relativně novou a neznámou oblastí matematiky, s geometrickou algebrou. Nejdříve jsou uvedeny základní definice a poté jsou studovány vlastnosti obecné geometrické algebry. Další velká část textu se věnuje Konformní geometrické algebře, která je v současnosti jedna z nejvíce zkoumaných a aplikovaných geometrických algeber. Jsou popsány její algebraické a geometrické vlastnosti, konkrétně schopnost reprezentovat určité geometrické objekty jako vektory. Taktéž umožňuje počítat jejich průniky a konformní transformace. Další část textu je zaměřena na aplikace Konformní geometrické algebry, nejdříve k popisu kinematiky robotické ruky a poté v binokulárním viděni.
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Static analysis of moving skyscraper
Jedlička, Michal ; Martinásek, Josef (referee) ; Vlk, Zbyněk (advisor)
The thesis is about static analysis of moving skyscraper (inspired by The Dynamic Tower). There is a rotation of each particular floor around its axis independently on each other. In this thesis, moving skyscraper is solved as a whole piece with specialization in the moving floors and their mounting on the core of the building.
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Modern numerical models of the YORP effect
Chrbolková, Kateřina ; Čapek, David (advisor) ; Ďurech, Josef (referee)
This thesis deals with the study of an non-gravitational effect called the YORP effect which affects the rotational state of irregularly shaped asteroids. In its first part, there is discussed the very physical nature of this phenomenon and further it demonstrates an effect similar to the YORP: the Yarkovsky effect. Second part analyzes several outstanding numerical models, which describe the YORP effect. It focuses on some aspects that no other models took in account and it also points out what approximations these models make. We have used two different nume- rical models on an asteroid shape of our own and we present it in the last part of this bachelor thesis. At the end of this paper, we compare our outputs with the findings of appropriate models. Our results agree with the cited articles in the majority of cases. We tried to analyze how the YORP effect depends on the chan- ging conductivity of the asteroids and we also found out that better resolution of shapes of asteroids leads to the convergence of the values of the YORP effect.
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Development of sexual characteristics of phlebotomine sand flies
Pavlasová, Michaela ; Votýpka, Jan (advisor) ; Král, David (referee)
Thesis is focused on study of phlebotomus generative attributes development and body dimension influence for some determinant notes therefore is divided into two thema parts. First thematic part of thesis is heeding to rotation of outer genitalia of chosen phlebotomus subgenus males and their representatives: Adlerius (Phlebotomus arabicus), Larroussius (Phlebotomus orientalis and Phlebotomus tobbi), Euphlebotomus (Phlebotomus argentipes), Paraphlebotomus (Phlebotomus sergenti), Phlebotomus (Phlebotomus papatasi), Lutzomyia (Lutzomyia longipalpis) and Sergentomyia (Sergentomyia schwetzi). In this parts was discovered and compared time of station of genitalia for chosen subgenera. Also the time from emergence of adults to rotation and rotation time dependence on adults daytime eclosion was measured. Times of rotation time duration including that of times from rotation beggining were at subgenuses expressively different, from S. schwetzi with the shortest rotation time of 12 hours to P. sergenti with the longest with average time rotation of 32 hours. Further were compared rotations of two genuses within subgenus Larroussius: P. orientalis a P. tobbi. Here also were each rotation times expressively different that do not validate the rotation should be specific for given subgenus. Observed was also...
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