Inductive sensor

Tato práce se zabývá problematikou indukčnostního snímače s vnesenou impedancí, která je využívána pro nedestruktivní zkoušení materiálů. Popisuje a realizuje postup při měření metodou vířivých proudů s použitím příložné cívky. Práce obsahuje výsledné hodografy odpovídající literatuře pro magneticky vodivý a magneticky nevodivý měřený materiál. Poslední část práce se zabývá rozborem vhodné volby pracovního bodu snímače odvozeného od naměřených hodnot.This bachelor thesis deals with indukčnostního-loaded impedance sensor, which is used for non-destructive materials testing. Describes a procedure for measuring the eddy current method using a straight coil. This thesis includes the final locus corresponding literature ferromagnetic and non-ferromagnetic for the measured material. The last part deals with the analysis of the appropriate choice of operating point derived from the sensor readings.

Programmable load

Tato diplomová práce pojednává o návrhu programovatelné umělé zátěže. V práci byla v teoretické části provedena rešerše komerčně dostupných zařízení, na jejímž základě byly diskutovány možnosti vlastního návrhu. Dále byl proveden návrh rezistorové sítě s pomocí počítačového programu, který byl vytvořen speciálně pro tento účel. Praktická část této práce se zabývá realizací zatěžovacího modulu, řídicí desky a vývojem programového vybavení. Celý systém je pak tvořen řídicí deskou a až deseti zatěžovacími moduly. Tyto moduly mají své vstupní svorky plovoucí, což umožňuje jejich libovolné kombinování. Moduly jsou konstruovány pro testování stejnosměrných i střídavých zdrojů.The diploma thesis deals with the design of a programmable load. As first, the research of available commercial devices was made in the theoretical part. Based on this research, the design possibilities of programmable load were discussed. As next, the design of resistor network was made, using a computer program that was developed for this purpose. Practical part deals with a realization of module of load, control board and software development. Proposed system consists of control board and ten modules. Modules have floating input terminals. This approach facilitate to arbitrary combination of their inputs. Modules are designed to work with DC and AC power supplies.

Data aquisition card for integrated circuit tester

Cílem této bakalářské práce je navrhnout a realizovat měřicí a stimulační kartu. Hlavním úkolem navrhované karty bude generování stimulačních signálů pro testovaný integrovaný obvod, zpracovávání signálů generovaných testovaným integrovaným obvodem, jejich převádění do digitální podoby a odesílání nadřazenému systému. V práci bude představen výběr vhodných obvodů k její realizaci, návrh obvodového zapojení měřicí a stimulační karty, návrh DPS karty a VHDL popis pro řídicí FPGA.The goal of this bachelor's thesis is to design and realize a data acquisition card. The main task of the designed card will be to generate stimulating signals for the tested integrated circuit, to process signals generated by the tested integrated circuit, to convert them into a digital form and to send them to a superior system. The thesis will present a choice of integrated circuits suitable for its realization, a wiring diagram of the data acquisition card, PCB design and VHDL code for the control FPGA chip.

Generator of Physically Unclonable Function

Tato práce řeší problematiku fyzicky neklonovatelných funkcí. V teoretické části jsou popsány základní principy pojmy pro seznámení čtenáře s probíraným tématem, členění a popis různých typů fyzicky neklonovatelných funkcí a jejich využití. V praktické části je popsán vlastní návrh implementace fyzicky neklonovatelné funkce, která využívá obsah paměti SRAM po resetu jako fyzikální charakteristiku. Vytvořená funkce podává slibné výsledky - vnitřní a vnější vzdálenosti se nepřekrývají.This thesis covers the topic of physically unclonable functions. In the research part of this theses there is information about basic principles of the topic as well as classification and description of different types of physically unclonable functions. There is also information about the practical use of physically unclonable functions. The practical part of this theses covers the implementation of my own version of physically unclonable function that uses after-reset SRAM memory contents as physical fingerprint. The parameters of this function are promising. The inner and intra distances do not overlap.

Rufous Common Cuckoo chicks are not always female

This is the author accepted manuscript. The final version is available from Springer Verlag via the DOI in this recordThe Common Cuckoo (hereafter Cuckoo) shows two adult plumage morphs—adult male plumage is grey and adult females are either grey or, less frequently, rufous. The situation is less clear in juveniles, as both sexes exhibit variable proportions of grey and rufous colour. We thus describe the patterns related to sex-specific plumage colour variation in a central European Cuckoo population. We genetically determined the sex of 91 Cuckoo chicks and using visual classification of photographs we scored juvenile plumage colouration of individual chicks into five classes based upon the increasing proportion of rufous colour on feathers. To verify these scores, we sampled chick feathers and quantified the proportion of rufous colour of individual feathers by digital image analysis. We found that juvenile females had a higher proportion of rufous colour of feathers than juvenile males. However, the difference was marginally non-significant based on visual inspection alone, and some male chicks even showed intensively rufous plumage like those of juvenile females. In contrast, we captured only grey adult males (n = 37), while five out of 20 adult females were rufous. The rufous colour of Cuckoo feathers considerably differed from the grey colour and the difference seemed to be larger in adults than in juveniles. We show that chicks, unlike adult females, cannot be visually assigned to either of the adult morphs. Therefore, we encourage further investigation of Cuckoo plumage colouration across the species’ range to examine the process of plumage maturation. A detailed genetic analysis is necessary to understand the origin of Cuckoo feather colouration.This study was supported by the Czech Science Foundation (project 17-12262S) and by the Institutional Research Plan (RVO: 68081766)

Weak Effects of Geolocators on Small Birds: A Meta-analysis Controlled for Phylogeny and Publication Bias

Currently, the deployment of tracking devices is one of the most frequently used approaches to study movement ecology of birds. Recent miniaturization of light-level geolocators enabled studying small bird species whose migratory patterns were widely unknown. However, geolocators may reduce vital rates in tagged birds and may bias obtained movement data. There is a need for a thorough assessment of the potential tag effects on small birds, as previous meta-analyses did not evaluate unpublished data and impact of multiple life-history traits, focused mainly on large species and the number of published studies tagging small birds has increased substantially. We quantitatively reviewed 549 records extracted from 74 published and 48 unpublished studies on over 7,800 tagged and 17,800 control individuals to examine the effects of geolocator tagging on small bird species (body mass <100 g). We calculated the effect of tagging on apparent survival, condition, phenology and breeding performance and identified the most important predictors of the magnitude of effect sizes. Even though the effects were not statistically significant in phylogenetically controlled models, we found a weak negative impact of geolocators on apparent survival. The negative effect on apparent survival was stronger with increasing relative load of the device and with geolocators attached using elastic harnesses. Moreover, tagging effects were stronger in smaller species. In conclusion, we found a weak effect on apparent survival of tagged birds and managed to pinpoint key aspects and drivers of tagging effects. We provide recommendations for establishing matched control group for proper effect size assessment in future studies and outline various aspects of tagging that need further investigation. Finally, our results encourage further use of geolocators on small bird species but the ethical aspects and scientific benefits should always be considered.Grantova Agentura Ceske Republiky 13-06451SInstitut Polaire Francais Paul Emile Victor IPEV-1036Institutional Research Plan RVO: 68081766Leverhulme Trust RPG-2013288Russian Foundation for Basic Research Arctic-18-05-60261Russian Science Foundation 17-14-0114

Spatiotemporal patterns of egg laying in the common cuckoo

Understanding egg-laying behaviour of brood parasites in space and time can improve our knowledge of interactions between hosts and parasites. However, no studies have combined information on the laying activity of an obligate brood parasite with detailed information on the distribution of host nests within an area and time period. Here, we used molecular methods and analysis of egg phenotypes to determine maternal identity of common cuckoo, Cuculus canorus, eggs and chicks found in the nests of four species of Acrocephalus warblers in consecutive years. The median size of a cuckoo female laying area (calculated as a minimum convex polygon) was correlated negatively with the density of host nests and positively with the number of eggs assigned to a particular female. Cuckoo female laying areas overlapped to a large extent and their size and location did not change between years. Cuckoo females preferentially parasitized host nests located close to their previously parasitized nests and were mostly host specific except for two that parasitized two host species. Future studies should focus on sympatric host and parasite communities with variable densities across different brood-parasitic systems to investigate how population density of hosts affects fitness and evolution of brood parasites. For instance, it remains unknown whether female parasites moving to new sites need to meet a threshold density of a potential host. In addition, young females may be more limited in their egg laying, particularly with respect to the activity of other parasites and hosts, than older females

Activity of the Police of the Czech Republic at the traffic accident site linked to the administrative or criminal proceedings

Práce je zaměřená na význam ohledání místa dopravní nehody ve spojitosti s jeho dalším využitím jak pro další trestní a přestupkové řízení, nebo sloužící jako podklad pro následné podrobné znalecké zkoumání. Dále se zabývá technikou a technickými prostředky, které je možné při ohledání použít.The thesis is focused on the importance of the inspection of the place of traffic accident in connection with its use for other criminal and infringement proceedings, or serving as a basis for subsequent detailed expert examination. Furthermore, it deals with technology and technical resources that can be used in the inspection.Dopravní fakulta Jana PerneraDiplomant komisi představil činnost PČR na místě dopravní nehody s vazbou na správní nebo trestní řízení. Prezentaci měl přehledně připravenou, ale nebyl dodržen doporučený čas obhajoby diplomové práce. Student působil nervózně, ale připraveně, mluvil srozumitelně, udržoval oční kontakt a prezentaci nečetl. Student reagoval na otázky zkušební komise uspokojivě