2089 research outputs found
Sort by
An Evaluation of the Performance of Top-of-Rail Lubricants and Friction Modifiers
No full textPoměrně novým trendem v oblasti řízení tření mezi kolem a kolejnicí je aplikace tzv. modifikátorů tření nebo maziv na temeno kolejnice s cílem optimalizovat hodnotu součinitele adheze. Cílem příspěvku je představit tuto problematiku a demonstrovat možnosti laboratorního hodnocení výkonových parametrů maziv a modifikátorů tření určených pro aplikaci na temeno kolejnice. Diskutovány jsou důležité implikace pro předpis jejich aplikace.A relatively new trend in the management of the friction between the wheel and rail is the application of so-called friction modifiers or lubricants on top of the rail in order to optimise coefficient of adhesion. The aim of this paper is to present this issue and to demonstrate the possibilities of laboratory evaluation of performance parameters of top-of-rail lubricants and friction modifiers. Important implications for the prescription of their application are discussed
Dramatic transfers: Mural painting and religious theatre in the Western Alps during the sixteenth century
No full textIn the specific context of the late medieval Alps, it has been demonstrated that artistic exchanges and the circulation of iconographic and stylistic patterns were quite common. Transference can take place between different media, like religious theatrical mysteries and painted works of art such as alpine chapels’ wall paintings. This paper explores the circulation of theatrical mysteries through the Alps between Provence, Brianzonese and Piemonte. It analyses some examples of iconographic transference, like composition, precise gesturing, attributes and accessories but also characters designation. A series of accurate matches is thus selected in vices and virtues wall paintings and in some saints’ painted cycles. It demonstrates also correspondences in the expressionism and dolorism in some episodes of saint Anthony’s life. With the analysis of two saints’ cycles (saints Andrew and Bartholomew), it will conclude trying to explain how to find the presence or the absence of dialogue between religious mysteries and wall paintings.In the specific context of the late medieval Alps, it has been demonstrated that artistic exchanges and the circulation of iconographic and stylistic patterns were quite common. Transference can take place between different media, like religious theatrical mysteries and painted works of art such as alpine chapels’ wall paintings. This paper explores the circulation of theatrical mysteries through the Alps between Provence, Brianzonese and Piemonte. It analyses some examples of iconographic transference, like composition, precise gesturing, attributes and accessories but also characters designation. A series of accurate matches is thus selected in vices and virtues wall paintings and in some saints’ painted cycles. It demonstrates also correspondences in the expressionism and dolorism in some episodes of saint Anthony’s life. With the analysis of two saints’ cycles (saints Andrew and Bartholomew), it will conclude trying to explain how to find the presence or the absence of dialogue between religious mysteries and wall paintings
CZECH NATIONAL STRATEGY OF DEVELOPMENT OF INTELLIGENT TRANSPORT SYSTEMS AND LINKED ACTIVITIES
No full textThe article presents topical news on intelligent transport systems policy, strategy, and linked activities in the Czech Republic. It introduces historical background, relation to other documents, and current development in 2021. The Strategy of Development of Intelligent Transport Systems 2021-2027 with a View to 2050 (in force since January 2021) is the core document. The strategy is introduced by its context, methodology and structure of the content. Focus on coming years is included in this article, too: essential support for the ITS policy brings the online ITS Library (https://www.its-knihovna.cz), a knowledge database, described here with its certain parts and space for supportive tools. The tools enable to manage information on implementation progress, selected progress indicators and monitoring of ITS data quality, expressed by data conformance testing and publishing. The conclusion chapter gives a general overview on implementation of the Strategy and the ITS Library in the future
Possibilities of Using JASTI Dummy in Assessing Effects of Pedestrian Collision with Tram Front End
No full textPříspěvek nastiňuje možnosti využití figuríny JASTI (Hybrid III 50th Percentile Male Pedestrian) pro hodnocení účinků srážky chodce s čelem tramvaje v souvislosti se vznikající legislativou. Je prezentován popis figuríny a veličin, které byly sledovány při zkouškáchrealizovaných v rámci stávajícího projektu. Dále jsou zmíněna omezení použitelnosti figuríny a návaznost na simulační modely.The paper outlines the possibilities of using the JASTI (Hybrid III 50th Percentile Male Pedestrian) dummy to assess the effects of a pedestrian collision with the front end of a tram in the context of legislation under preparation. A description of the dummy and the variables that were monitored in the tests carried out in the current project is presented. Furthermore, the limitations of the applicability of the dummy and the relation to simulation models are mentioned
Reduction of Guiding Forces in Curves by Means of Active Wheelset Steering
No full textČlánek na základě simulačních výpočtů porovnává efekt jednotlivých systémů pro snižování velikosti vodicích sil v obloucích koleje používaných u elektrických lokomotiv. Z tohoto srovnání vykazuje největší přínos aktivní natáčení náprav, které je v článku dále podrobněji zkoumáno z hlediska detekce poloměru oblouku trati, algoritmů řízení a citlivosti na proměnlivé parametry trati a rychlost jízdy vozidla. Navržený systém aktivního natáčení náprav je následně otestován pomocí simulace jízdy v reálném obloukovitém úseku trati o délce 21 km a výsledky jsou porovnány s vozidlem v konvenčním uspořádání.Based on the computer simulations the potential effect of various systems for reduction of guiding forces in track curves for electric locomotives are compared. From this comparison, the greatest potential is shown by active wheelset steering, which is further examined in the article in terms of detecting the radius of the track curve, control algorithms and sensitivity to variable track parameters and vehicle speed. The proposed system of active wheelset steering is then tested by computer simulations of vehicle run in a real section of a track with a length of 21 km and the results are compared with a vehicle in a conventional arrangement
Vaccines, Spas and Yellow Fever: Expert Physicians, Professional Honour and the State in the Mid-Nineteenth Century
No full textThe nineteenth century was a period when the modern sciences claimed they were the best way of improving the lives of the people and attaining useful knowledge about the world. At the same time, it was an era when the Ancien Régime, a plural world of hierarchically organised communities, was morphing into a capitalist society based on equality before the Law and the free competition of goods and ideas. Our article focuses on several aspects of the physicians’ fight for professional consolidation in a changing world: the patterns of institutionalisation of medicine and healthcare as well as the dynamics of professionalisation of healthcare, including the masculinisation of authority and the public acknowledgement of expert authority in connection with the growing legitimacy – and politicisation – of scientific discourse, but also with practices reaffirming the honour and social status of physicians as a profession. We approach this vast topic from a European perspective, tracing trans-imperial and transnational trends and including the colonial dimensions, as well as the interaction of European powers and subjects with extra-European states and peoples.The nineteenth century was a period when the modern sciences claimed they were the best way of improving the lives of the people and attaining useful knowledge about the world. At the same time, it was an era when the Ancien Régime, a plural world of hierarchically organised communities, was morphing into a capitalist society based on equality before the Law and the free competition of goods and ideas. Our article focuses on several aspects of the physicians’ fight for professional consolidation in a changing world: the patterns of institutionalisation of medicine and healthcare as well as the dynamics of professionalisation of healthcare, including the masculinisation of authority and the public acknowledgement of expert authority in connection with the growing legitimacy – and politicisation – of scientific discourse, but also with practices reaffirming the honour and social status of physicians as a profession. We approach this vast topic from a European perspective, tracing trans-imperial and transnational trends and including the colonial dimensions, as well as the interaction of European powers and subjects with extra-European states and peoples
Lost (and Found) in Translation: The Reception of Pinel’s and Esquirol’s Psychiatric Theories and the Conformation of Melancholy, Hypochondria, Mania and Hysteria in Spain, 1800–1855
No full textIn the history of psychiatry in Spain, the first half of the nineteenth century has been considered a period of uncritical reception of the theories of Philippe Pinel and Jean Étienne Esquirol. In this article I strive to problematise the diffusionist assumptions of this thesis, studying the participation of local agents in the circulation and reception of medical knowledge. Through a comparative analysis of the paratexts and the modifications made to the translations of the works of these authors, I intend to expose how the theories of Pinel and Esquirol were unified in the Spanish case. Through a concrete analysis of the modification of the diagnoses of melancholy, hypochondria, mania and hysteria, I intend to expose the variations that were applied to medical knowledge in its reception in Spain in order to adapt it to the frameworks of local medicine. Lastly, I intend to expose the methodological advantages offered by conceiving the translations of works and books as cultural products whose meaning is constructed in its place of rception, and not in the place of original publication.In the history of psychiatry in Spain, the first half of the nineteenth century has been considered a period of uncritical reception of the theories of Philippe Pinel and Jean Étienne Esquirol. In this article I strive to problematise the diffusionist assumptions of this thesis, studying the participation of local agents in the circulation and reception of medical knowledge. Through a comparative analysis of the paratexts and the modifications made to the translations of the works of these authors, I intend to expose how the theories of Pinel and Esquirol were unified in the Spanish case. Through a concrete analysis of the modification of the diagnoses of melancholy, hypochondria, mania and hysteria, I intend to expose the variations that were applied to medical knowledge in its reception in Spain in order to adapt it to the frameworks of local medicine. Lastly, I intend to expose the methodological advantages offered by conceiving the translations of works and books as cultural products whose meaning is constructed in its place of rception, and not in the place of original publication
RESEARCH ON THE USE OF ECO-DRIVING IN CITY TRAFFIC
No full textAs it is commonly known, during the operation of vehicles, their operational parameters change, related to the influence of working factors, the current road situation or wear processes of vehicle components. Currently, for many years there has been a discussion on improving the environmental properties of motor vehicles, taking into account technical, legal and operational factors. The article presents selected research results of a vehicle using the eco-driving technique in city traffic on the so-called routine route in a selected area of the city of Lublin in south-eastern Poland. The tests were carried out on a passenger car with a spark ignition engine powered by gasoline. The obtained test results focus on the influence of selected driving parameters, such as: average speed, driving time, mileage, road characteristics, number of stops, number of brakes. The conducted research indicates the possibility of using eco-driving in city traffic and gives positive results
IS THE INFLUENCE OF AN ANCHOR IN TRANSPORT SAME FOR EVERY GENERATION? Case study in deciding on the ticket price
No full textMnoho publikací bylo napsáno o působení kognitivních klamů při rozhodování, ať už je tím klamem paradox volby, efekt volavky, haló efekt nebo klam dostupnosti. Tento článek se zaměřuje na efekt kotvy neboli vtisknutí. Lidé mají tendenci nechat se ovlivnit v podstatě jakýmkoli číslem, které uvidí před rozhodováním o ceně zboží a jeho nákupu. Otázkou zůstává, zda se všechny generační skupiny nechají ovlivnit stejným způsobem, nebo jestli jsou různé generace různě citlivé na působení kotvy. Tato otázka byla soustředěna na oblasti rozhodování o ceně letenky, kde proběhl průzkum mezi různými generacemi. Nejen na základě analýzy rozptylu pak bylo možné konstatovat, že mladší generace jsou na vliv kotvy citlivější než ty starší.There are many articles available about cognitive biases that show why people often make irrational decisions. Cognitive biases can come in the form of decoy effects, paradoxes of choice, halo effects, or availability heuristics. This paper deals with the effects anchoring or imprinting effect. People tend to be influenced by random numbers that they see before making their decisions about prices or purchases. The question is if all generations are sensitive in the same way or if there is any difference between generations when it comes to the anchoring effect. This question is answered through research on decision-making in relation to plane ticket prices. Subjects were surveyed by demographics such as their generation. ANOVA was one method used that showed that younger generations were more sensitive to the anchor than the older ones
Testing of Draw- and Buffing Gear Components on Dynamic Test Stand at the Faculty of Transport Engineering of the University of Pardubice
No full textPříspěvek se zabývá zkouškami prvků tažného a narážecího ústrojí železničních kolejových vozidel, které byly a jsou realizovány na Dopravní fakultě Jana Pernera Univerzity Pardubice především v rámci řešení studentských projektů a závěrečných prací. Nejprve je pozornost zaměřena na zkoušky dynamických charakteristik elastomerových prvků vypružení tažného a narážecího ústrojí, jež byly provedeny za účelem vytvoření matematického modelu těchto prvků pro použití v multi-body modelech pro simulace projevů podélné dynamiky vlakových souprav, protože popis těchto prvků pouze statickou charakteristikou se v určitých situacích jeví jako nedostatečný. Dále je pak v článku představena příprava tenzometrické šroubovky pro měření tažných sil, která najde vedle experimentálního ověřování výsledků simulačních výpočtů z oblasti podélné dynamiky vlakových souprav uplatnění především v rámci dalšího výzkumu jízdních odporů železničních vozidel.This contribution deals with tests of components of draw- and buffing gear of railway vehicles realized at the Faculty of Transport Engineering of the University of Pardubice, especially in framework of student’s projects and theses. In the beginning, the attention is paid to the tests of dynamic characteristics of elastomer suspension components of draw gears and buffers. The tests were performed in order to create a mathematical model of these components for application in multi-body simulations for investigation of longitudinal train dynamics effects, because a description of these components only by their static characteristics seems to beinsufficient in certain situations. Besides to that, a preparation of tensometric screw coupling for measurement of traction forces is introduced in the paper. This measuring device will be applied especially in further research of running resistance of railway vehicles as well as at the experimental verification of results of the longitudinal train dynamics simulations
Data sources:
Access Repository Dashboard
Do you manage Časopisy Univerzity Pardubice? Access insider analytics, issue reports and manage access to outputs from your repository in the CORE Repository Dashboard!