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  1. 3 Przemysł Chemiczny
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1
Content available Comparative assessment of magnesium, copper, and zinc addition to aluminium waste casting for improving ship material behaviour
Kiryanto K., Tuswan T., Samuel S., Firdhaus A., Ergana D., Nadiyas Juneva T., Virman Firdaus L.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
|
2024
|
Vol. 18 No. 2
401--408
EN
The aluminium industry for ship materials produces waste material that can pollute the environment. To protect the environment from material pollution, the aluminium waste recycling process can be used to develop ship material. This study aims to analyze the physical and mechanical characteristics of aluminium with magnesium, copper, and zinc addition. Several tests, such as chemical composition, tensile, and impact tests, will be conducted to ascertain the mechanical properties of aluminium alloy. Adding alloy material in the range of 0-10% resulted in various alloy element compositions. It can be analyzed that the aluminium contents decreased with the increase of alloy elements. The highest rise in alloy elements can be found in the addition of magnesium than in copper and zinc addition. Moreover, the mechanical tests showed that aluminium casting with magnesium, copper, and zinc additions influenced the mechanical properties of the aluminium alloy. It can be found that tensile strength and modulus of elasticity values improved with the increase of alloy addition. The addition of magnesium has better tensile properties than the addition of copper and zinc. In contrast, the impact resistance decreased with the addition of magnesium, making the alloy more brittle.
2
Content available Comparison study on seismic isolation design of RC frame structure based on two different codes
Zhang Junyi, Li Jiawei, Zhang Zhiqiang
Archives of Civil Engineering
|
2024
|
Vol. 70, nr 2
387--401
EN
With the development of building seismic isolation technology and the official release of the Isolation Code in September 2021, seismic isolation design in China will now rely on two foundational codes: the Seismic Code and the Isolation Code. This paper take a ceramic jar storage of the RC frame structure as the research object, and carry out the seismic isolation design based on the separated calculation design method of the Seismic Code and the unitary calculation design method of the Isolation Code respectively, and clarify the control index of the Isolation Code is the story drift angle. The maximum displacement is reduced by 37.5%. In terms of material consumption, the Isolation Code leads to a 5.94% decrease in concrete usage, accompanied by a 13.97% increase in steel consumption, resulting in an overall cost increase of 4.98%. The findings indicate that seismic isolation design, guided by the Isolation Code, substantially mitigates the seismic response of the superstructure. The damage extent to structural members is reduced by 15-20%, promoting enhanced safety and repairability. The outcomes of this study offer valuable insights for future seismic isolation designs in RC frame structures.
3
Content available Carsharing as an example of smart mobility – comparative study Poland–Germany
Wiktorowska-Jasik Anna
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2023
|
nr 74 (146)
75--82
EN
Modern cities are focused on the implementation of the assumptions of sustainable transport development. They invest in modern solutions and intelligent technologies that improve the mobility of residents and reduce energy consumption and pollution emitted by means of transport. This article deals with issues of smart urban mobility and carsharing, in particular, as one of the examples of the implementation of sustainable transport policy. The objective of this article is a comparative analysis of the pace of development of the carsharing markets in Poland and Germany. The analysis is carried out using statistical and comparative analysis methods. In addition, for a complete presentation of the problem raised, a literature analysis is performed. The research area covers two countries, Poland and Germany, from which ten cities for each are selected for analysis. In addition, to achieve the assumed objective, we also present the basic assumptions of smart mobility and solutions used in cities, and then determine the increase in the number of cars driving in the carsharing system. In addition, the factors influencing the change in transport patterns of urban residents are analyzed, and the importance of modern communication technologies in the development of carsharing systems is emphasized. The results of the analysis can be used as a tool to support the decisions of city authorities in the field of transportation management and, in particular, the implementation of carsharing systems. They also present the dependencies of the spread of this solution in a given urban space. They indicate the largest problems that may affect the introduction of this solution as an element of the city’s transportation system.
4
Content available Comparative study of the efficiency, effectiveness and robustness of the TGE S.A. Day-Ahead Market model and system
Marlęga Radosław, Tchórzewski Jerzy
Studia Informatica : systems and information technology
|
2023
|
Vol. 1(28)
29--45
EN
The article contains selected results of comparative research on the quality of the parametric model, corrected in selected situations with the use of ANN and the Day-Ahead Market system of TGE S.A. carried out in MATLAB and Simulink. The System Identification Toolbox library was used for identification tests and Simulink for simulation and comparative tests. The comparative studies used such measures of model and system quality as: efficiency, effectiveness and robustness. Their waveforms as well as their average values and absolute errors and relative errors between the identification model or the identification-neural model and the system were obtained. The results of general tests were shown for the hours: 6:00, 12:00, 18:00 and 24:00 in 2019, and the detailed tests for 6:00. The sensitivity of the waveforms obtained in terms of model quality and the Day-Ahead Market system was also tested, depending on the assumed values of such parameters as e.g. electricity volume or volume-weighted average price of electricity.
5
Content available A comparative study between fractionalized and fractional order PID controllers for control of a stable system based on particle swarm optimization algorithm
Idir Abdelhakim, Berrabah Fouad, Canale Laurent
Przegląd Elektrotechniczny
|
2023
|
R. 99, nr 12
87--90
EN
Most industrial applications use integer-order proportional integral derivative (IOPID) controllers due to well-known characteristics such as simplicity and ease of implementation. However, because of their nonlinear nature and the underlying iso-damping feature of fractional-order operators, fractional-order PID (FOPID) and fractionalized-order PID (FrOPID) controllers outperform the IOPID controllers. In this study, three different controllers based on particle swarm optimization are used to regulate a stable system. While a FrOPID controller only has to optimize four parameters and a normal PID controller only needs to optimize three parameters, a FOPID controller requires the optimization of five parameters. Set-point tracking, and better disturbance rejection are obtained with the fractional PID controller, whereas fractionalized PID outperforms the other controllers in terms of noise attenuation.
PL
Większość aplikacji przemysłowych wykorzystuje regulatory IOPID rzędu liczb całkowitych ze względu na dobrze znane cechy, takie jak prostota i łatwość implementacji. Jednak ze względu na ich nieliniowy charakter i leżącą u ich podstaw funkcję izo-tłumienia operatorów ułamkowego rzędu, regulatory PID ułamkowego rzędu (FOPID) i PID ułamkowego rzędu (FrOPID) przewyższają regulatory IOPID. W tym badaniu trzy różne kontrolery oparte na optymalizacji roju cząstek są używane do regulacji stabilnego systemu. Podczas gdy regulator FrOPID musi zoptymalizować tylko cztery parametry, a normalny regulator PID tylko trzy parametry, regulator FOPID wymaga optymalizacji pięciu parametrów. Śledzenie wartości zadanej i lepsze tłumienie zakłóceń uzyskuje się za pomocą ułamkowego regulatora PID, podczas gdy ułamkowy PID przewyższa inne regulatory pod względem tłumienia szumów.
6
Content available Study on the cleanliness of super clean coal prepared by water-only cyclone
Liu Peikun, Wang Hui, Jiang Lanyue, Zhang Yuekan, Yang Xinghua, Li Xiaoyu, Li Feng
Physicochemical Problems of Mineral Processing
|
2023
|
Vol. 59, iss. 3
art. no. 168129
EN
Maintaining clean and pristine nature is the key to the use of super clean coal (SCC) for coal-based materials or energy combustion. Herein, SCC is prepared by a new water-only cyclone method, and compared the surface characteristics with the SCC products obtained by conventional chemical deashing method. The results indicate that: FTIR analysis revealed that the chemical method changed the original functional group of coal; BET analysis revealed that the SCC products prepared by the water-only method maintained the micropore volume of the raw coal and yielded a uniform and concentrated distribution of pore sizes, however, the chemical method destroying the original pore structure in the coal; SEM-EDS analysis indicated that the surface of SCC particles that were deashed using the water-only cyclone method was smooth and neat, whereas those obtained using the chemical method were seriously corroded, had a rough surface, and the SCC particles were prone to acid residues and precipitates. This study opens an innovative, simple, and clean method for the preparation of SCC, which further expands and enhances the potential application value of SCC.
7
Content available Environmental responsibility of corporate management in the Visegrad region – comparative study of the Czech Republic, Poland and Slovakia
Kozáková Jana, Skýpalová Renata, Pieńkowski Dariusz
Economics and Environment
|
2023
|
No. 4
1--25
EN
The article presents a comprehensive investigation into the prioritisation of environment-oriented Corporate Social Responsibility (CSR) activities among companies within the Visegrad region, encompassing the Czech Republic, Poland and Slovakia. An online questionnaire featuring Likert scale questions was used to collect data from November 2022 to June 2023 on the emphasis placed on 11 distinct environment-oriented CSR activities. Analytical methods covered descriptive and inferential analyses. The study contributes original insights by focusing on the Visegrad region's corporate engagement in environmental CSR activities. The findings reveal significant disparities between countries, particularly in the domains of eco-friendly transportation solutions and investments in green technologies for environmental progress. Statistically significant differences were observed between the Czech Republic and Poland, as well as between Poland and Slovakia, there by shedding light on the diverse CSR orientations and priorities within this geographic context. These findings underscore the importance of tailored CSR strategies within the Visegrad region's corporate landscape to address environmental challenges effectively.
PL
Artykuł przedstawia kompleksowe badanie priorytetyzacji działań z zakresu społecznej odpowiedzialności biznesu (CSR) zorientowanych na środowisko wśród firm w regionie wyszehradzkim, obejmującym Republikę Czeską, Polskę i Słowację. Kwestionariusz online zawierający pytania w skali Likerta został wykorzystany do zebrania danych od listopada 2022 r. do czerwca 2023 r. na temat nacisku kładzionego na 11 różnych działań CSR zorientowanych na środowisko. Metody analityczne obejmowały analizy opisowe i inferencyjne. Badanie wnosi oryginalne spostrzeżenia, koncentrując się na zaangażowaniu przedsiębiorstw z regionu wyszehradzkiego w działania CSR na rzecz środowiska. Wyniki badania ujawniają znaczące rozbieżności między krajami, szczególnie w dziedzinie ekologicznych rozwiązań transportowych i inwestycji w zielone technologie na rzecz postępu środowiskowego. Statystycznie istotne różnice zaobserwowano między Republiką Czeską a Polską, a także między Polską a Słowacją, co rzuca światło na różne kierunki i priorytety CSR w tym kontekście geograficznym. Wyniki te podkreślają znaczenie wypracowanych strategii CSR w ramach korporacyjnego krajobrazu regionu wyszehradzkiego w celu skutecznego sprostania wyzwaniom środowiskowym.
8
Content available Ocena zagrożenia pracowników promieniowaniem nadfioletowym z wykorzystaniem modelu mobilnego systemu pomiarowego
Pawlak Andrzej
Bezpieczeństwo Pracy : nauka i praktyka
|
2023
|
nr 12
14-19
PL
W artykule zaprezentowano opracowany w Centralnym Instytucie Ochrony Pracy - Państwowym Instytucie Badawczym (CIOP-PIB) model mobilnego systemu pomiarowego do oceny zagrożenia pracowników promieniowaniem nadfioletowym (UV) na stanowiskach pracy. Omówiono jego konstrukcję oraz aplikację, za pomocą której steruje się przebiegiem pomiaru. Przedstawiono w skrócie metodykę badań promieniowania UV na stanowiskach pracy oraz przytoczono wyniki z porównania wskazań mobilnego system pomiarowego z profesjonalnym radiometrem na wybranych stanowiskach pracy.
EN
The article presents a developed model mobile measurement system developed at the Central Institute for Labour Protection - National Research Institute (CIOP-PIB) for assessing the risk of workers' exposure to ultraviolet (UV) radiation at workstations. Its construction and the application used to control the measurement process are discussed. The methodology of UV radiation research at workstations was briefly presented and the results from the comparison of indications of a mobile measuring system with a professional radiometer at selected workstations were quoted.
9
Content available remote Zależność między oceną atrakcyjności wielorodzinnego budynku mieszkalnego a jego lokalizacją
Zima Krzysztof, Belniak Stanisław, Gil-Mastalerczyk Joanna
Materiały Budowlane
|
2022
|
nr 10
53--56
PL
Tematyka budownictwa deweloperskiego od lat dominuje w dyskusjach publicznych dotyczących zabudowy miast. Poruszanymi tematami są zarówno rosnące ceny nieruchomości, jak i architektura nowych budynków, „zabetonowywanie” miast oraz tzw. patodeweloperka. Twórcy neologizmu „patodeweloperka” pragnęli określić nim wiele niepożądanych efektów, skutków oraz nadużyć występujących w działalności deweloperów, takich jak budowa mieszkań o nadmiernie skompresowanej powierzchni, tzw. mikro kawalerek, lokali o skrajnie niefunkcjonalnych, czy wręcz kuriozalnych rozkładach itp. Z drugiej strony podstawowym czynnikiem sukcesu inwestycji deweloperskich i wyboru inwestycji przez klientów jest lokalizacja. Celem artykułu jest analiza zależności architektury inwestycji deweloperskich od lokalizacji i dotyczy krakowskiego rynku mieszkaniowego.
EN
The subject of development construction has been a dominant topic in public discussions regarding city development for years. The topics discussed include rising real estate prices and the architecture of new buildings, "concreting" cities and the so-called "Pato-developer". The authors of the neologism "path developer" wanted to define with it a whole range of undesirable effects, consequences and abuses of activity occurring in the activities of housing developers, such as the construction of apartments with excessively compressed space, the so-called micro-studios, premises with extremely non-functional or even bizarre layouts, etc. On the other hand, the main factor for the success of development investments and the choice of investments by customers is the location. It seems an interesting problem to answer the question whether a good location is correlated with good architecture and investment planning. The analysis will concern the Krakow housing market.
10
Content available Comparative study of the performance of an internal combustion engine and its emission working on conventional fuel (Diesel) and alternative fuel (Bio-CNG)
Ingawale Shrikant M., Bagi J. S., Nikam L. S.
Journal of Mechanical and Energy Engineering
|
2022
|
Vol. 6, No 1
67--75
EN
Currently, the world is facing problems regarding environmental pollution due to the combustion of fossil fuels. Generally, the combustion of fossil fuels takes place in the Internal Combustion engine for power or electricity generation. The combustion of fossil fuels emits greenhouse gases that lead to the greenhouse effect. The main symptom of the greenhouse effect is increased earth surface temperature. Also, the resources of fossil fuels are depleting rapidly and can take thousands of years to reproduce, so the time has come to go for lesser polluting renewable fuels. In this research, Bio-CNG is considered as an alternative fuel to conventional fuel, i.e. Diesel. The performance test on four-stroke IC Engines working on Bio-CNG and Diesel fuel is conducted simultaneously. The performance parameters such as Brake Power, Indicated Power, Thermal Efficiencies, Mechanical, Volumetric efficiency for both fuels are compared. Along with the performance, the emission is also recorded and compared. The results have shown that Bio-CNG has slightly less performance ability for similar engines working on Diesel fuel. Yet, this study also shows that Bio-CNG possesses the ability to replace the conventional fuel with some engine and exhaust system modifications. The higher calorific value (47000 kJ/kg) and lower or negligible carbon emission make it the best sustainable fuel substitute to conventional fuel, i.e. Diesel.
11
Content available Analiza porównawcza wybranych szkieletów programistycznych aplikacjiwebowych opartych na języku Java
Książek Radosław, Pańczyk Beata
Journal of Computer Sciences Institute
|
2022
|
Vol. 23
66--70
PL
Tematem artykułu jest analiza porównawcza szkieletów programistycznychSpring (z konfiguracją Spring Boot), Micronaut oraz Quarkus. Obserwowany w ostatnim czasie wzrost popularnościtych rozwiązań uwarunkował konieczność wyznaczenia ich profilu zastosowań. W celu wyznaczenia charakterystyk badanych technologii, przeprowadzono szereg testów wydajnościowych oraz optymalizacyjnych aplikacji zbudowanych w oparciu o wymienione szkielety programistyczne. Rezultaty analiz wykazały, iż dzięki wysokiemu stopniu optymalizacji, szkielety Micronaut oraz Quarkus są doskonale przystosowane do pracy w środowiskach chmurowych, natomiast rozbudowany szkielet Spring (Boot), pomimo mniejszej wydajności, jest pozycją niezastąpioną w bardziej złożonych projektach
EN
This article presents the results of a comparative analysis of Spring (with Spring Boot configuration), Micronaut and Quarkus programming frameworks. The recently observed increase in popularity of these solutions made it necessary to determine their application profile. In order to determine the characteristics of the researched technologies, a series of performance and optimization tests of applications built on the basis of the above-mentioned programming frameworks were carried out. The results of the analyzes showed that thanks to the high degree of optimization, the Micronaut and Quarkus frameworks are perfectly adapted to work in cloud environments, while Spring (Boot) framework, despite its lower efficiency, is an irreplacible solution in complex projects.
12
Content available Municipal solid waste management systems in Poland and the Czech Republic. A comparative study
Jakubus Monika, Stejskal Bohdan
Environment Protection Engineering
|
2020
|
Vol. 46, nr 3
61--78
EN
The work provides an overview of methods of waste collection and treatment in Poland and the Czech Republic. Differences ( in contrast to Poland, MBT technology is not used in the Czech Republic and only one incineration plant works) and similarities (similar share of waste management methods, the comparable mass of generated municipal solid waste per capita and similarly low sorting rate) between both countries have been indicated focusing on various fractions of municipal solid wastes as well as the dominant system of their management. SWOT analysis focused on the municipal solid waste management of both countries has been created. In Poland, the proportion between small amounts of waste collected selectively and the mass of waste sent to landfills is not satisfactory. In the Czech Republic, lots of municipal solid waste is deposited in landfills.
13
Content available remote Badania porównawcze w zakresie metod oznaczania stabilności termooksydacyjnej olejów bazowych
Krasodomski Michał, Krasodomski Wojciech, Skibińska Agnieszka, Żółty Magdalena
Przemysł Chemiczny
|
2019
|
T. 98, nr 4
563--568
PL
Trzy oleje bazowe o różnym charakterze chemicznym poddano procesom utleniania metodą wirującej bomby i zmodyfikowaną metodą Petrooxy. Porównano uzyskane wartości stabilności termooksydacyjnej. Wyniki wskazały na brak istotnej korelacji pomiędzy zmianami obserwowanymi w widmach FTIR a wynikami badań stabilności. Analiza spektralna potwierdziła hipotezę o różnicach w przebiegu procesów chemicznych w czasie oznaczenia porównywanymi metodami.
EN
Three base oils of different chem. nature were subjected to oxidn. under lab. conditions in a rotating vessel and by the modified Petrooxy method to compare their thermal oxidn. stability. Their spectra did not correlate with the results of the stability tests but confirmed the hypothesis on difference in chem. processes of both oxidn. methods.
14
Content available A Comparative Study of Student Engagement in two Polish Universities
Einolander J., Vanharanta H., Kantola J., Paliszkiewicz J., Mądra-Sawicka M.
Zeszyty Naukowe Politechniki Poznańskiej. Organizacja i Zarządzanie
|
2018
|
Nr 76
87--98
EN
Student engagement and retention are major concerns for universities around the world. It is vital to improve student retention by delivering quality education and engaging students in their studies, leading to student success and graduation and integration in the workforce. This study examines a degree of engagement in two Polish universities. The aim of this research was to evaluate and compare student engagement between two respondent groups. Data for this study were collected from 394 university students through selfevaluation using internet-based survey instrument. The differences between the universities were compared according to the current state, target state and, creative tension, describing the gap between a person’s feeling of current reality and target for future. The analysis of the test results clearly demonstrated the possibility to use such an application to evaluate the students’ engagement and, the comparison clearly identified considerable differences between the two university cases.
PL
Zaangażowanie i utrzymywanie studentów to ważna kwestia uniwersytetów na całym świecie. Konieczne jest poprawienie retencji studentów przez ich angażowanie i zapewnianie wysokiej jakości edukacji. Badanie dotyczy oceny i porównania stopnia zaangażowania studentów w dwóch polskich uczelniach. W badaniu zebrano dane dotyczące 394 studentów w ramach samooceny przeprowadzonej za pomocą internetowego narzędzia ankietowego. Różnice między uniwersytetami zostały porównane zgodnie z stanem aktualnym i docelowym, opisując lukę między odczuwaniem obecnej rzeczywistości a celami na przyszłość. Analiza wyników testów wyraźnie pokazała możliwość wykorzystania aplikacji do oceny zaangażowania uczniów, a porównanie wyraźnie wskazało znaczne różnice między dwoma przypadkami uniwersyteckimi.
15
Content available Comparative Study of the Accuracy of AIS and ARPA Indications. Part 1. Accuracy of the CPA Indications
Wawruch R.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
|
2018
|
Vol. 12, no. 3
439--443
EN
According to the IMO recommendation when the target data from radar tracking and AIS are both available and the association criteria are fulfilled such that the radar and AIS information are considered as for one physical target, then as a default condition in radar equipment should be automatically selected and displayed the AIS target symbol and the alphanumerical AIS target data only. The article presents research conducted in real sea conditions on the reliability of information presented by the ship's AIS and ARPA about the passing distance with the other vessel tracked by radar equipment and fitted with AIS.
16
Content available remote Badania porównawcze metod oznaczania stabilności termooksydacyjnej smarów plastycznych
Krasodomski M., Krasodomski W., Skibińska A., Żółty M.
Przemysł Chemiczny
|
2018
|
T. 97, nr 3
370--376
PL
Smary wytworzone przez zagęszczenie kompleksowym mydłem litowym trzech olejów o różnym charakterze chemicznym poddano ocenie stabilności termooksydacyjnej klasyczną metodą utleniania i zmodyfikowaną metodą Petrooxy. Uzyskane wyniki wskazują na korelację pomiędzy zmianami obserwowanymi w widmach FTIR badanych smarów a zastosowaną metodą. Nie zaobserwowano związku pomiędzy tymi zmianami a wynikami badań stabilności różnych smarów. Analiza spektralna potwierdziła hipotezę o różnicach w przebiegu procesów chemicznych podczas prowadzenia oznaczenia za pomocą obu metod.
EN
Three oils of different chem. nature were used for prepn. of Li complex greases subjected then to oxidn. either by a std. method or by a modified Petrooxy method to compare their thermal oxidn. stability. The results indicated a correlation between changes obsd. in the FTIR spectra of the tested greases with the applied method. However, no relationship was observed between the changes and the results of tests on the stability of various greases. Their spectral data confirmed the hypothesis on difference in chem. course of both oxidn. methods
17
Content available Comparative study on the classification methods for breast cancer diagnosis
Qiu Y., Zhou G., Zhao Q., Cichocki A.
Bulletin of the Polish Academy of Sciences. Technical Sciences
|
2018
|
Vol. 66, nr 6
841--848
EN
Digital mammography is one of the most widely used approaches for breast cancer diagnosis. Many researchers have demonstrated the superiority of machine learning methods in breast cancer diagnosis using different mammography databases. Since these methods often have different pros and cons, which may confuse doctors and researchers, an elaborate comparison and examination among them is urgently needed for practical breast cancer diagnosis. In this study, we conducted a comprehensive comparative study of the state-of-the-art machine learning methods that are promising in breast cancer diagnosis. For this purpose we analyze the largest mammography diagnosis database: Digital Database for Screening Mammography (DDSM). We considered various approaches for feature extraction including principal component analysis (PCA), nonnegative matrix factorization (NMF), spatial-temporal discriminant analysis (STDA) and those for classification including linear discriminant analysis (LDA), random forests (RaF), k-nearest neighbors (kNN), as well as deep learning methods including convolutional neural networks (CNN) and stacked sparse autoencoder (SSAE). This paper can serve as a guideline and useful clues for doctors who are going to select machine learning methods for their breast cancer computer-aided diagnosis (CAD) systems as well for researchers interested in developing more reliable and efficient methods for breast cancer diagnosis.
18
Content available Comparative water scarcity footprint study of two nuclear power plants
Ansorge L., Dlabal J.
Przegląd Naukowy Inżynieria i Kształtowanie Środowiska
|
2017
|
Vol. 26, No. 4
489--497
EN
This study compares the Life Cycle Assessment based Water Scarcity Footprint of produced energy unit in two nuclear power plants in the Czech Republic between 2005 and 2015. Primary data has been used to allocate impacts to the core processing stage. Although the real total amount of water consumption in both power plants is similar, the water scarcity footprint in Temelín nuclear power plant is of approximately 8.9 m3 H2Oeq per MWh lower than in Dukovany power plant. The cooling water has the most significant contribution to the freshwater availability impact category. Evaporation from reservoirs which are a part of water management of the individual power plants has lower, but not inconsiderable, contribution to the water consumption. In the case of Temelín nuclear power plant, the loss caused by evaporation from Hněvkovice reservoir is of approximately 6.5% of the difference between withdrawal and discharge of the power plant. In the case of Dukovany nuclear power plant, evaporation from Dalešice - Mohelno reservoir is of even around 11%.
19
Content available remote Fabrication of Ag and Au nanoparticles in cross-linked polymer microgels for their comparative catalytic study
Shah L. A., Sayed M., Siddiq M.
Materials Science Poland
|
2017
|
Vol. 35, No. 3
651--659
EN
Three dimensional cross-linked polymer microgels with temperature responsive N-isopropyl acrylamide (NIPAM) and pH sensitive methacrylic acid (MAA) were successfully synthesized by free radical emulsion polymerization with different amounts of MAA. Silver and gold nanoparticles with the size of 6.5 nm and 3.5 nm (±0.5 nm), respectively were homogeneously reduced inside these materials by chemical reduction method at pH 2.78 and 8.36 for the preparation of hybrid materials. The samples were characterized by FT-IR, DLS and TEM techniques. The catalytic activity of the hybrid materials was investigated for the reduction of 4-nitrophenol (4-NP) using NaBH4 as reducing agent by UV-Vis spectroscopy. The hybrid polymer network synthesized at pH 8.36 showed enhanced catalytic efficiency compared to the catalysts synthesized at pH 2.78. In this study, it has been stated that the catalyst activity strongly depends on the amount of MAA, pH value during synthesis and the type of entrapped metal nanoparticles.
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Content available Studium porównawcze sposobów odzysku energii w pojeździe drogowym
Zakrzewski J., Pietruszewski R.
Autobusy : technika, eksploatacja, systemy transportowe
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2017
|
R. 18, nr 6
1305-1308, CD
PL
W artykule przedstawiono studium porównawcze różnych sposobów odzysku energii w pojeździe drogowym wraz z omówieniem wymagań stawianych przed takimi systemami oraz analizą poszczególnych technologii w kontekście wymienionych parametrów.
EN
Paper presents possibilities of energy recuperation in road vehicles with a comparative study of them. Most important ERS characteristics are discussed and analyzed for each technology.
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