Wyniki wyszukiwania - Biblioteka Nauki

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Thermal navigation for blind people

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Marzec P. , Kos A.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2021

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tom Vol. 69, nr 1

art. no. e136038

EN

This article presents a system of precise navigation for a visually impaired person which uses GPS navigation and an infrared sensor in the form of an infrared matrix. The presented system allows determining the orientation and distance of a blind person relative to a selected object, e.g. a wall or road edge. The application of the above solution facilitates a significant increase in the accuracy of determining the position of a blind person compared to the accuracy offered by commonly used ground satellite devices. The system uses thermal energy accumulated in the environment without the need to generate additional signals. The main parts of the system are a simple infrared matrix, data processing system and vibrating wristband. Messages and navigation warnings are sent to a blind person in the form of a vibration code. The article describes the method of determining the path of a specified width and distance from the wall of a building, curb, etc., along which a blind person should move. The article additionally describes the method of determining the orientation of a blind person depending on the selected object. Such a method facilitates verifying whether the visually impaired person is moving according to the indicated direction. The method can also be used to navigate mobile robots. Due to the use of natural energy for data registration and processing, the mobile navigation system can be operated for a long time without the need to recharge the battery.

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Narzędzie analityczne Lighthouse w ocenie jakości wybranych serwisów internetowych bibliotek akademickich w Polsce

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Marzec P. , Piotrowski M. D.

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2018

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tom T. 26, nr 2

25--46

PL

Rozwój technologii internetowych oraz zmienność potrzeb użytkowników serwisów WWW wymusza konieczność stałej optymalizacji usług realizowanych za pośrednictwem sieci Internet. Ośrodki takie jak biblioteki akademickie powinny zapewniać dostęp do zasobów cyfrowych na najwyższym poziomie. Istotne z punktu widzenia jakości jest zastosowanie innowacyjnych rozwiązań i narzędzi. Nowym podejściem w tworzeniu serwisów internetowych są tzw. progresywne aplikacje webowe (ang. Progressive Web Apps, PWA). Stanowią one połączenie możliwości oferowanych przez natywne aplikacje mobilne oraz responsywne strony internetowe. Rozwiązanie to zapewnia integrację środowiska aplikacji natywnej z przeglądarką internetową. Głównym celem artykułu jest przedstawianie możliwości wykorzystania automatycznych narzędzi analitycznych w procesie optymalizacji serwisów internetowych. Zaprezentowano w nim nowoczesne, otwarte narzędzie analityczne Lighthouse (pol. Latarnia morska) służące do poprawy jakości serwisów internetowych. W pierwszej części przedstawiono jego podstawowe funkcjonalności (obecnie wbudowane wraz z innymi narzędziami deweloperskimi w przeglądarkę Google Chrome), które umożliwiają analizę takich cech serwisów internetowych jak: zgodność ze standardami PWA, spełnianie standardów dostępności stron WWW oraz ich optymalizacji pod kątem wyszukiwarek internetowych. W drugiej części zaprezentowano zastosowanie Lighthouse w praktyce. W części trzeciej wykazane zostały czynności, jakie wykonano w zakresie optymalizacji serwisu Biblioteki Uniwersyteckiej w Toruniu (w środowisku lokalnym) pod względem PWA. Ważną częścią pracy są wyniki badań, których przedmiotem były wybrane serwisy internetowe bibliotek akademickich w Polsce. Wyniki analizy porównawczej dla 11 wybranych serwisów wykazały, że są one stosunkowo dobrze zoptymalizowane pod kątem wyszukiwarek. Pozytywnie przedstawia się ich dostosowanie do wymagań związanych z dostępnością. Na zadowalającym poziomie stoi także wykorzystywanie rekomendowanych standardów tworzenia serwisów internetowych. Pewne wątpliwości mogą budzić wyniki wydajności badanych serwisów oraz poziom implementacji rozwiązań PWA.

EN

Internet technologies development and the variability of the users needs are two main reasons of the requirement of websites optimization. This problems have an impact on the quality of the library digital services too. Innovative solutions and modern tools should be used in that field. The development of Progressive Web Applications (PWA) is the new approach in the web design. PWA is a combination of the mobile native application and responsive web site. It brings integration of a mobile native application environment with web browsers. This paper deals with websites quality assessment automatic tools. Description of the Lighthouse (an analytic tool from Google Chrome developer tools) is the main topic of this paper. In the first part of the paper authors give a general overview of the Lighthouse tool functionality. Authors focused at features for analyse such as: compliance with PWA standards, web accessibility guidelines assessment and search engine optimization. In the second part the Lighthouse operating are shown. Authors carried out research about websites quality of the selected university libraries in Poland. Main functions as a part of tools for developers in Google Chrome browser were described first. Those functions are tools for evaluation in such categories like: performance, Progressive Web Applications (PWA), accessibility, search engine optimization (SEO). Description of Lighthouse in practise was the second part of this work. In the third part, optimization of University Library in Torun website at local server was shown. Very important part of this paper is description of Lighthouse audits of selected websites of academic libraries. The results showed that optimization level of those websites is good. There are strenges point of SEO attributes and accessibility. Standards of website development is well represented too. Problems with performance and implementation of PWA technology occured at websites that were evaluated during research.

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An influence of correction of the ignition advance angle on the combustion process in SI engine fuelled by lpg with the addition of DME

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Kubica G. , Marzec P.

Journal of KONES

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2019

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tom Vol. 26, No. 4

285--292

EN

The paper presents the results of tests of the SI engine fuelled by LPG with the addition of DME in the form of a mixture of gaseous fuels. Experimental tests were carried out on a chassis dynamometer in the full range of engine loads, at a fixed rotational speed: 2000, 2500 and 3000 rpm. The use of dimethyl ether (DME) as a fuel component makes it possible to exploit its important advantages. DME can be produced as a renewable fuel, which is important from the point of view of ecology. Another important fact is the presence of oxygen in this fuel, which has a positive effect on the engine volumetric efficiency. During the tests, the ignition timing was also adjusted due to the very good DME flammability. Two additional correction levels were applied, increasing the ignition advance by 3 and 6 CA degrees, compared to the factory settings of the driver. The analysis of the obtained results allowed determining the dependence of the basic engine parameters, in the function of the correction of ignition advance angle. In the summary, attention was also paid to the possibility of determining corrected maps of the ignition advance angle taking into account the variable proportions of fuel components.

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Selected aspects of the use of gaseous fuels blends to improve efficiency and emission of si engine

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Kubica G. , Flekiewicz M. , Marzec P.

Transport Problems

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2019

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tom T. 14, z. 1

95--103

EN

The paper presents results of SI engine tests, carried on for different gaseous fuels. The analysis carried out made it possible to define the correlation between fuel composition and engine operating parameters. Tests cover various gaseous mixtures: methane with hydrogen and LPG with DME. The first group, considered as low carbon content fuels, can be characterized by low CO2 emissions. The flammability of hydrogen added in those mixtures realizes the function of combustion process activator and improves the energy conversion. The second group of fuels is constituted by LPG and DME mixtures. DME mixes perfectly with LPG and differently than in the case of other hydrocarbon fuels also consisting of oxygen, which makes the stoichiometric mixture less oxygen demanding. In the case of this fuel, improvement in engine volumetric and overall engine efficiency has been noticed, compared to LPG. During the tests, standard CNG/LPG feeding systems have been used, which underlines the utility value of the research.

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Potential environmental life cycle impacts of fuel cell electric vehicles powered by hydrogen produced from Polish coke oven gas

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Folęga P. , Burchart D. , Marzec P. , Jursova S. , Pustejovska P.

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2022

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tom T. 17, z. 1

151--161

EN

This study analysed the greenhouse gas (GHG) emissions of hydrogen fuel cell vehicles’(FCEVs’) life cycles. These included models running on hydrogen derived from coke oven gas (COG), which is a by-product of the coking process of coal and includes hydrogen, methane, and other gases. FCEVs and hydrogen have the potential to drive future mobility. Hydrogen can be separated from the COG in the process of pressure swing adsorption to obtain a purity of hydrogen that meets the requirements of a hydrogen FCEV. An environmental life cycle assessment (LCA) of FCEV powered by hydrogen produced from Polish COG was conducted. The direction of hydrogen production strategies in Poland was also presented. The analyses included the entire life cycle of FCEVs with the production of hydrogen from COG in a Polish coke plant. A comparative analysis of FCEVs and other alternative fuels was conducted, and the main determinants of GHG emissions of FCEV were given. Importantly, this is the first attempt at an environmental assessment of FCEVs in Poland.