Electromagnetic compatibility of tram equipment

Tato diplomová je věnována problematice EMC tramvajových vozidel a trakčního systému. V první kapitole vymezeny problematiky, kterými se následně zabývá diplomová práce. Další kapitola uvádí cíle práce. Následné kapitoly provádějí rozbor problematik popsaných v kapitole číslo 2. V poslední kapitole je navržen vývojový diagram, který má sloužit jako nástroj k odhadu ohrožení trakčního pohonu v důsledku vyvolaných ložiskových proudů.This diploma thesis deals with the issue of EMC of tram vehicles and traction system. The first chapter defines the issues that are then dealt with in the thesis. The next chapter lists the objectives of the work. Subsequent chapters analyze the issues described in chapter 2. In the last chapter, a flow chart is proposed, which should serve as a tool to estimate the hazards of the traction drive due to induced bearing currents.

Exploiting Semantic Technologies in Smart Environments and Grids: Emerging Roles and Case Studies

Semantic technologies are currently spreading across several application domains as a reliable and consistent mean to address challenges related to organization, manipulation, visualization and exchange of data and knowledge. Different roles are actually played by these techniques depending on the application domain, on the timing constraints, on the distributed nature of applications, and so on. This paper provides an overview of the roles played by semantic technologies in the domain of smart grids and smart environments, with a particular focus on changes brought by such technologies in the adopted architectures, programming techniques and tools. Motivations driving the adoption of semantics in these different, but strictly intertwined, fields are introduced using a strong application-driven perspective. Two real-world case studies in smart grids and smart environments are presented to exemplify the roles covered by such technologies and the changes they fostered in software engineering processes. Learned lessons are then distilled and future adoption scenarios discussed

800-yr-long records of annual air temperature and precipitation over southern Siberia inferred from Teletskoye Lake sediments

A unique 800-yr-long record of annual temperatures and precipitation over the south of western Siberia has been reconstructed from the bottomsediments of Teletskoye Lake, Altai Mountains using an X-ray fluorescence scanner (XRF) providing 0.1-mm resolution timeseries of elementalcomposition and X-ray density (XRD). Br content appears to be broadly correlative with mean annual temperature variations because of changesin catchment vegetation productivity. Sr/Rb ratio reflects the proportion of the unweathered terrestrial fraction. XRD appears to reflect water yieldregime and sediment flux. Sedimentation is rather continuous because annual clastic supply and deposited mass are the same. The artificial neuralnetworks method was applied to convert annual sedimentary time-series of XRD, Br content, and Sr/Rb ratio to annual records of temperature andprecipitation using a transfer function. Comparison of these reconstructed Siberian records with the annual record of air temperature for theNorthern Hemisphere shows similar trends in climatic variability over the past 800 yr. Estimated harmonic oscillations of temperature andprecipitation values for both historical and reconstructed periods reveal subdecadal cyclicity