Design and experimental verification of MESH type radio network for non-licensed bands

Bakalářská práce se zabývá problematikou návrhu MESH sítě pod technologií IQRF. V úvodní části jsou rozebrány základní techniky radiového přenosu, na které navazují technologie zde používané. Druhá kapitola je věnována představení IQRF, jeho základním parametrům a používaným zařízením, včetně možností cloudu. Třetí část práce se věnuje návrhu topologie a metodolgii měření. Poslední část se zaměřuje na ověřování a experimentální měření parametrů IQRF sítě v různých podmínkách a uspořádáních.This thesis is focused on problematic of designing a MESH network with use of IQRF technology. Basic techniques in radio transmission are presented in the introduction part, followed by technologies used in the radio environment. The second chapter presents IQRF, its base parameters and devices which can be used in its network, including cloud. The third part deals with the designing of topology and the methodology of the experimental verification. The last chapter stresses the measurement of parameters of IQRF network in various conditions and arrangements.

Cyber-environment for systems of ICS/SCADA type

Tato práce se věnuje problematice kybernetického prostředí pro systémy typu ICS/SCADA. První, kratší část je zaměřena na obecné představení ICS/SCADA systémů a~jejich fungování. Je zde rozebrán jejich komunikační model a elementární prvky nezbytné pro fungování celého systému. Tato část je převážně teoretická a slouží jako úvod do problematiky. Je nezbytná pro pochopení druhé, praktické části. V rámci praktické části je jako první vybírán vhodný systém pro realizaci celého projektu. Jsou zde definována kritéria na základě, kterých je realizován samotný systém. Systém je zprovozněn pod \uv{frameworkem} openMUC a testován pomocí simulátorů na základě zadání této práce.The thesis explores the problematics of cyber environment for the ICS/SCADA systems. First, shorter section is mainly focused on general introduction into the ICS/SCADA systems and their inner workings. Communication model of a general SCADA system and its foundational elements are explained. It is mainly theoretical passage and it serves as an introduction. It is necessary for understanding the second part which is mainly practical. The appropriate system is chosen as a first thing in the practical part of the thesis for the implementation of the whole project. There are defined criteria on which the system itself is implemented. Following that the system itself is implemented under a framework called openMUC and it is tested with help of the simulators according to the objective of the thesis.

Modeling of fatigue events

Tato bakalářská práce se zabývá určením únavové životnosti součásti při cyklickém jednoosém namáhání. Životnost materiálu je parametr potřebný pro správný návrh velké části strojních součástí. Práce zahrnuje stručný přehled základních poznatků o únavových procesech v materiálech. V textu je obsažena stručná rešerše komerčních i volně dostupných programů pro řešení únavy materiálu, dále porovnání analytického výpočtu únavové životnosti součásti s výpočtem totožného testu součásti pomocí nástroje Fatigue Tool v prostředí programu Ansys Workbench a zhodnocení získaných dat ze dvou výše uvedených metod výpočtu.This bachelor thesis deals with determining the fatigue life expectancy of a part under cyclic uniaxial stress. Life cycle of a material is a parameter needed for correct design of majority of machine components. This thesis contains a brief overview of basic findings about fatigue related processes in materials. The text includes short list of both commercial and freely available fatigue life solvers. Comparison of analytical calculation of fatigue life of a part with a calculation of the exact test by Fatigue Tool module in Ansys Workbench environment and the final evaluation of the gained data from both of the previously mentioned methods of calculation.330 - Katedra aplikované mechanikydobř

Archaeological research of deserted recreational cottage in Krkonoše

There is a deserted recreational cottage called „Jelení louky“ near the town of Pec pod Sněžkou in the Krkonoše. This cottage is special because it has been left almost untouched and in a well-preserved state. The cottage was built in the first half of the 19th century and was abandoned in 1998. This spring, an archaeologist from the Department of Archaeology at the University of West Bohemia conducted archaeological research on the site. The research focused on the formation processes of archaeological record and on the cottage’s life.There is a deserted recreational cottage called „Jelení louky“ near the town of Pec pod Sněžkou in the Krkonoše. This cottage is special because it has been left almost untouched and in a well-preserved state. The cottage was built in the first half of the 19th century and was abandoned in 1998. This spring, an archaeologist from the Department of Archaeology at the University of West Bohemia conducted archaeological research on the site. The research focused on the formation processes of archaeological record and on the cottage’s life

Captive villages behind the iron curtain – possibilities of archaeological recognition of the Cold War

The past twenty-five years have seen the development of a sub-discipline in archaeology labelled “20th Century Conflict Archaeology” around the world. The sub-discipline is focused on the remains of the military, civil, political and religious conflicts of the last century. Traces of these events are examined using an interdisciplinary approach because many different sources have been left behind to serve the researchers of this field, each of which carries unique information hardly detectable from another point of view. While the First and Second World Wars have attracted the lion’s share of attention, in recent years the efforts of researchers have turned to the Cold War and to the most famous symbol of the era—the so-called Iron Curtain, a fence of barbed wire separating the Eastern and the Western blocs. The most famous part of the curtain is the Berlin Wall. Nevertheless, research of this topic in Czech academia remains marginalized. The aim of this paper is to present how these issues are studied abroad and outline opportunities to study this in the Czech Republic. Our examples are the Iron Curtain itself and the village of Maříž, in whose history the events of the last century left an indelible mark.The past twenty-five years have seen the development of a sub-discipline in archaeology labelled “20th Century Conflict Archaeology” around the world. The sub-discipline is focused on the remains of the military, civil, political and religious conflicts of the last century. Traces of these events are examined using an interdisciplinary approach because many different sources have been left behind to serve the researchers of this field, each of which carries unique information hardly detectable from another point of view. While the First and Second World Wars have attracted the lion’s share of attention, in recent years the efforts of researchers have turned to the Cold War and to the most famous symbol of the era—the so-called Iron Curtain, a fence of barbed wire separating the Eastern and the Western blocs. The most famous part of the curtain is the Berlin Wall. Nevertheless, research of this topic in Czech academia remains marginalized. The aim of this paper is to present how these issues are studied abroad and outline opportunities to study this in the Czech Republic. Our examples are the Iron Curtain itself and the village of Maříž, in whose history the events of the last century left an indelible mark

Proton Affinities of Organocatalysts Derived from Pyridine N-oxide

Proton affinities of several efficient organocatalysts METHOX, QUINOX, ANETOX, KOTOX, FUREOX, and FUROOX bearing a pyridine N-oxide or 2,2′-bipyridyl N,N′-dioxide moiety were de-termined by using extended kinetic method and density functional theory calculations. Proton affinities are in the range of 1030–1060 kJ mol–1. Using isodesmic reactions, the effect of combining two pyridine N-oxide units in the neutral and the protonated molecule was studied: The combination of an unfavorable interaction in the former case and a favorable interaction in the latter accounts for the superbasic proper¬ties of 2,2′-bipyridyl N,N′-dioxides. Last but not least, the theoretically predicted pKa in ethanol are 0.1, –2.7, 0.9, 1.8, 1.9, and 2.3 for the METHOX, QUINOX, ANETOX, FUROOX, FUREOX, and KOTOX, respectively

Multi-seasonal systematic camera-trapping reveals fluctuating densities and high turnover rates of Carpathian lynx on the western edge of its native range

Camera-trapping and capture-recapture models are the most widely used tools for estimating densities of wild felids that have unique coat patterns, such as Eurasian lynx. However, studies dealing with this species are predominantly on a short-term basis and our knowledge of temporal trends and population persistence is still scarce. By using systematic camera-trapping and spatial capture-recapture models, we estimated lynx densities and evaluated density fluctuations, apparent survival, transition rate and individual's turnover during five consecutive seasons at three different sites situated in the Czech-Slovak-Polish borderland at the periphery of the Western Carpathians. Our density estimates vary between 0.26 and 1.85 lynx/100 km2 suitable habitat and represent the lowest and the highest lynx densities reported from the Carpathians. We recorded 1.5-4.1-fold changes in asynchronous fluctuated densities among all study sites and seasons. Furthermore, we detected high individual's turnover (on average 46.3 +- 8.06% in all independent lynx and 37.6 +- 4.22% in adults) as well as low persistence of adults (only 3 out of 29 individuals detected in all seasons). The overall apparent survival rate was 0.63 +- 0.055 and overall transition rate between sites was 0.03 +- 0.019. Transition rate of males was significantly higher than in females, suggesting male-biased dispersal and female philopatry. Fluctuating densities and high turnover rates, in combination with documented lynx mortality, indicate that the population in our region faces several human-induced mortalities, such as poaching or lynx-vehicle collisions. These factors might restrict population growth and limit the dispersion of lynx to other subsequent areas, thus undermining the favourable conservation status of the Carpathian population. Moreover, our study demonstrates that long-term camera-trapping surveys are needed for evaluation of population trends and for reliable estimates of demographic parameters of wild territorial felids, and can be further used for establishing successful management and conservation measures.Postprin

Long-term changes (1990–2015) in the atmospheric deposition and runoff water chemistry of sulphate, inorganic nitrogen and acidity for forested catchments in Europe in relation to changes in emissions and hydrometeorological conditions

The international Long-Term Ecological Research Network (ILTER) encompasses hundreds of long-term research/monitoring sites located in a wide array of ecosystems that can help us understand environmental change across the globe. We evaluated long-term trends (1990–2015) for bulk deposition, throughfall and runoff water chemistry and fluxes, and climatic variables in 25 forested catchments in Europe belonging to the UNECE International Cooperative Programme on Integrated Monitoring of Air Pollution Effects on Ecosystems (ICP IM). Many of the IM sites form part of the monitoring infrastructures of this larger ILTER network. Trends were evaluated for monthly concentrations of non-marine (anthropogenic fraction, denoted as x) sulphate (xSO4) and base cations x(Ca + Mg), hydrogen ion (H+), inorganic N (NO3 and NH4) and ANC (Acid Neutralising Capacity) and their respective fluxes into and out of the catchments and for monthly precipitation, runoff and air temperature. A significant decrease of xSO4 deposition resulted in decreases in concentrations and fluxes of xSO4 in runoff, being significant at 90% and 60% of the sites, respectively. Bulk deposition of NO3 and NH4 decreased significantly at 60–80% (concentrations) and 40–60% (fluxes) of the sites. Concentrations and fluxes of NO3 in runoff decreased at 73% and 63% of the sites, respectively, and NO3 concentrations decreased significantly at 50% of the sites. Thus, the LTER/ICP IM network confirms the positive effects of the emission reductions in Europe. Air temperature increased significantly at 61% of the sites, while trends for precipitation and runoff were rarely significant. The site-specific variation of xSO4 concentrations in runoff was most strongly explained by deposition. Climatic variables and deposition explained the variation of inorganic N concentrations in runoff at single sites poorly, and as yet there are no clear signs of a consistent deposition-driven or climate-driven increase in inorganic N exports in the catchments.Long-term changes (1990–2015) in the atmospheric deposition and runoff water chemistry of sulphate, inorganic nitrogen and acidity for forested catchments in Europe in relation to changes in emissions and hydrometeorological conditionsacceptedVersio