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Tytuł:
Application of Flour Blends from Modified Cassava and Suweg Flours in Gluten-Free Steamed Brownies
Autorzy:
Marta, Herlina
Yusnia, Shifa A.
Fetriyuna, Fetriyuna
Arifin, Heni R.
Cahyana, Yana
Sondari, Dewi
Powiązania:
https://bibliotekanauki.pl/articles/31341118.pdf
Data publikacji:
2024-05-24
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
Amorphophallus paeoniifolius
flour blends
gluten-free steamed brownies
hedonic sensory test
Manihot esculenta
pasting properties
texture parameters
Opis:
This study aimed to formulate flour blends from modified cassava flour (MCF) and suweg flour (SF) and use them to produce gluten-free steamed brownies (GFSB) with desirable qualities. The blends varied in the proportions of MCF and SF by weight, namely 80:20 (F1), 70:30 (F2), and 60:40 (F3). Wheat flour-based steamed brownies (WFSB) served as the control. The results showed that the MCF to SF ratio significantly influenced various parameters of flour blends, such as chemical compositions, color characteristics, pasting, and functional properties. Higher SF content in the blend decreased peak viscosity, breakdown, and setback. Water absorption capacity also decreased as the MCF to SF ratio in the flour blend increased. The color of flour blends with an increasing proportion of SF was getting darker and more different from the color of wheat flour. GFSB exhibited lower volume expansion than WFSB. Increasing SF content in the flour blend increased the texture parameters of GFSB including hardness, cohesiveness, gumminess, and chewiness Values of color difference, representing color variation between gluten-free and control brownies, ranged from 2.30 to 6.32, where the GFSB-F1 was more similar in color to WFSB. Preference levels for color, aroma, and texture of GFSB did not significantly differ from WFSB. However, GFSB-F2 was preferred in taste and overall acceptance over WFSB. The utilization of modified cassava flour and suweg flour blends in gluten-free steamed brownies offers a promising avenue for diversifying gluten-free baking options.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2024, 74, 2; 188-196
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evidence for the Psychometric Properties of Component Test Items in the Eurofit Test Battery administered to Elite Schoolboy Rugby Union Players: A Test-retest Reliability Study
Autorzy:
Mupondi, Tafadzwa
Shumba, Tonderai Washington
von der Heiden, Christiane
Kamba, Farirai
Chiwaridzo, Matthew
Powiązania:
https://bibliotekanauki.pl/articles/48528835.pdf
Data publikacji:
2024
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
test-retest reliability
rugby
adolescents
junior
Eurofit test battery
Opis:
Rugby is a popular sport and requires participants to have commensurate physical attributes for effective participation. One physical fitness test battery which enjoys extensive use contextually is the European Test of Physical Fitness (Eurofit). However, the psychometric properties of the test battery have not been explored and documented in the local context. Therefore, this study was conducted to examine the test-retest reliability of the Eurofit test battery items among elite schoolboy rugby players in Harare, Zimbabwe. Thirty-two (32) players with the mean age of 17.2 (SD=1.03) years completed all the tests during the in- season period. Anthropometric and Eurofit test measurements were obtained twice with seven days separating the assessments. The Intraclass Correlation Coefficient (ICC) estimated the reliability test items. The global ICCs for the Eurofit test items ranged from 0.59 to 0.98. The Sit-and-Reach test yielded the highest temporal reliability (ICC=0.98). The Plate Tapping test, Flamingo Balance test and 10×5m Shuttle Run test showed ICCs < 0.7. Cognisant of the study limitations, some component test items of Eurofit test battery can be recommended for reliably evaluating aspects of physical fitness in junior rugby players in Zimbabwe whilst others still need consideration and test modification.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2024, 46; 117-130
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Field Experiment as a Tool to Verify The Effectiveness of Prototype Track Structure Components Aimed at Reducing Railway Noise Nuisance
Autorzy:
Kraśkiewicz, Cezary
Klekot, Grzegorz
Książka, Piotr
Zbiciak, Artur
Mossakowski, Przemysław
Chacińska, Patrycja
Al Sabouni-Zawadzka, Anna
Powiązania:
https://bibliotekanauki.pl/articles/31339754.pdf
Data publikacji:
2024
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
vibroacoustic isolator
ballasted track structure
ballastless track structure
noise reduction
field test.
Opis:
The almost unlimited possibilities of modern computational tools create the temptation to study phenomena related to the operation of engineering objects exclusively using complex numerical simulations. However, the fascination with multi-parametric complex computational models, whose solutions are obtained using iterative techniques, may result in qualitative discrepancies between reality and virtual simulations. The need to verify on real objects the conclusions obtained from numerical calculations is therefore indisputable. The enormous cost and uniqueness of large-scale test stands significantly limit the possibility of conducting tests under real conditions. The solution may be an experiment focused on testing features relevant to the given task, while minimising the dimensions of the objects under consideration. Such conditions led to the concept of conducting a series of field experiments to verify the effectiveness of prototype track components, which were developed using numerical simulations to reduce the noise caused by passing trains. The main aim of this study is to examine the acoustic efficiency of prototype porous concrete sound absorbing panels, in relation to the ballasted and ballastless track structures. Presented results of the proposed unconventional experiments carried out on an improvised test stand using the recorded acoustic signals confirm the effectiveness of the developed vibroacoustic isolators.
Źródło:
Archives of Acoustics; 2024, 49, 1; 61-71
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reactivity of the Oxygen Transport System of Elite Athletes with Different Individual and Typological Properties in their Nervous Systems
Reaktywność systemu transportu tlenu u elitarnych sportowców z różnymi indywidualnymi i typologicznymi właściwościami ich układów nerwowych
Autorzy:
Lyzohub, Volodymyr
Pustovalov, Vitalii
Kozhemiako, Tetiana
Khomenko, Sergii
Bezkopylny, Oleksandr
Powiązania:
https://bibliotekanauki.pl/articles/31341068.pdf
Data publikacji:
2024
Wydawca:
Akademia Bialska im. Jana Pawła II
Tematy:
anaerobic exercise
walk test
nervous processes
functional performance
aerobic exercise
ćwiczenia anaerobowe
test chodu
procesy nerwowe
wydajność funkcjonalna
ćwiczenia aerobowe
Opis:
Background. The mechanisms of neurovegetative interaction of the functional reactivity of the oxygen transport system (OTS) and genetically determined typological properties of the central nervous system (CNS) were studied. Material and methods. The typological properties of the central nervous system of elite football players (32 individuals) were determined on the “Diagnost-1” neurodynamic complex. The reactivity of the OTS was investigated in a stepincreasing running speed test using the Jaeger Oxycon Mobile gas analyzer. Results. The dependence of the reactive properties of the OTS on the genetically determined functional mobility of nervous processes (FMNP) was established. Statistically significant higher indicators of blood stroke volume, carbon dioxide release rate (VСO2) and blood lactate (НLa) were found in the athletes with a higher level of FMNP than in individuals with a low degree of typological property (р=0.033-0.045). The athletes with low FRNP were characterized by statistically significant high values of heart rate (HR) and rate of oxygen uptake (VO2 max). The indicators of minute volumes of blood and respiration did not show statistically significant differences in groups of sportsmen with different gradations of FMNP (р=0.064-0.078). Conclusions. The theoretical model and mechanisms of interaction of the individual-typological property of FMNP with the functional reactivity of OTS and the possibility of using the results to evaluate the playing activity of football players were discussed.
Wprowadzenie. Zbadano mechanizmy interakcji neurowegetatywnej funkcjonalnej reaktywności systemu transportu tlenu (ang. oxygen transport system – OTS) i określonych genetycznie właściwości typologicznych ośrodkowego układu nerwowego (OUN). Materiał i metody. Właściwości typologiczne ośrodkowego układu nerwowego elitarnych piłkarzy (32 osoby) zostały określone na kompleksie neurodynamicznym „Diagnost-1”. Reaktywność OTS została zbadana w teście stopniowego zwiększania prędkości biegu przy użyciu analizatora gazowego Jaeger Oxycon Mobile. Wyniki. Ustalono zależność reaktywnych właściwości OTS od uwarunkowanej genetycznie funkcjonalnej mobilności procesów nerwowych (FMNP). U sportowców z wyższym poziomem FMNP stwierdzono istotne statystycznie wyższe wskaźniki objętości wyrzutowej krwi, szybkości uwalniania dwutlenku węgla (VСO2) i mleczanu we krwi (НLa) niż u osób o niskim stopniu właściwości typologicznych (р=0,033-0,045). Sportowcy z niskim FRNP charakteryzowali się statystycznie istotnie wysokimi wartościami częstości akcji serca (HR) i szybkości poboru tlenu (VO2 max). Wskaźniki objętości minutowej krwi i oddychania nie wykazywały istotnych statystycznie różnic w grupach sportowców o różnej gradacji FMNP (р=0,064-0,078). Wnioski. Omówiono model teoretyczny i mechanizmy interakcji indywidualno-typologicznej właściwości FMNP z funkcjonalną reaktywnością OTS oraz możliwość wykorzystania wyników do oceny aktywności gry piłkarzy.
Źródło:
Health Problems of Civilization; 2024, 18, 1; 83-93
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Somatics and Physical Fitness of Selected Military Classes
Autorzy:
Rzepko, Marian
Kozubal, Adam
Ostrowski, Paweł
Trębacz, Zbigniew
Tłuczek, Waldemar
Chlastawa, Łukasz
Drozd, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/47529190.pdf
Data publikacji:
2024
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
military classes
body composition
physical fitness
Beep test
Opis:
The idea of opening military classes refers to the tradition of national defense education, training the young generation to defend the homeland and strengthening the country's ties with the army. The creation of military classes became a precedent for the Ministry of National Defense and the Ministry of National Education to build a common defense education system for high school students. The task of military classes in Polish high schools is to prepare young people for future service in various services, such as police, fire brigades and other special services. The aim of this work is to capture the relationship between body composition components and physical fitness of selected uniformed groups. The body composition components were analyzed with the help of the Tanita Body Composition Analyzer DC-240MA. The study used tests from the Polish Army physical fitness test, the Beep test and barbell bench press while lying on a straight bench. One of the conclusions obtained was that the correlation between body composition and fitness tests showed that higher levels of body fat, lean body mass, BMI and body weight negatively affect the results obtained in pull-ups, trunk bends, shuttle runs and Beep tests.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2024, 46; 17-33
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strategies Used by Procrastinators and Non-Procrastinators to Cope with Test Anxiety
Autorzy:
Jaradat, Abdul-Kareem M.
Powiązania:
https://bibliotekanauki.pl/articles/48511619.pdf
Data publikacji:
2024-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
coping strategies
test anxiety
procrastination
irrational delay
procrastinators
non-procrastinators
Opis:
This study aimed to investigate the relationship of academic procrastination to coping strategies with test anxiety and to explore whether there are significant differences in using these strategies between procrastinators and non-procrastinators. The study sample comprised 455 high school students (mean age was 17.04 years). Two scales were used one for measuring academic procrastination and the other for measuring coping strategies with test anxiety. The scale of coping strategies is composed of four subscales: Danger control (e.g., using time effectively), anxiety control (e.g., relaxation), anxiety repression (e.g., denial of a situation that produces test anxiety), and situation control (e.g., cheating). Data were analysed using Pearson product-moment correlation coefficients, median-split method and t-tests. Results revealed that academic procrastination correlated positively and significantly with anxiety repression and situation control, and correlated negatively and significantly with anxiety and danger control. In addition, the results showed that anxiety repression was the most common strategy used by procrastinators, while anxiety danger was the most common strategy used by non-procrastinators. Significant differences were found between procrastinators and non-procrastinators in using coping strategies, where procrastinators used more strategies of anxiety repression and situation control, whereas non-procrastinators used more strategies of danger control and anxiety control.
Źródło:
The New Educational Review; 2024, 76; 206-216
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testy modelu świata i teorii umysłu jako podstawa budowy zaufania do podmiotów moralnych typu AGI
Tests of World Model and Theory of Mind as Tools for Building Trust in Moral AGI Agents
Autorzy:
Sołoducha, Krzysztof
Stacewicz, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/37557772.pdf
Data publikacji:
2024
Wydawca:
Akademia Ignatianum w Krakowie
Tematy:
etyka sztucznej inteligencji
zaufanie do technologii
sztuczny podmiot moralny
test teorii umysłu
test modelu świata
ethics of artificial intelligence
trust in technology
artificial moral agent
theory of mind test
world model test
Opis:
W artykule rozważany jest problem budowania zaufania do artefaktów obliczeniowych typu AGI (ang. Artificial General Intelligence), z etycznego punktu widzenia określanych jako podmioty moralne explicite. W wyniku analizy opartej na badaniach literatury oraz przedstawieniu aktualnych trendów w rozwoju systemów AI wskazanych jest kilka warunków skonstruowania testów behawioralnych niezbędnych do sprawdzania poprawności ich działania z etycznego punktu widzenia. Przeprowadzenie takich testów powinno ułatwić procedury etycznej aprobaty systemów AGI zarówno na poziomie wytwórców, indywidualnego użytkownika, jak i jednostek certyfikujących.
The paper considers the problem of building trust in computational artefacts of the AGI (Artificial General Intelligence) type, which are defined from an ethical point of view as explicite moral agents. As a result of an analysis based on research of the literature and current trends in the development of AGI systems, several conditions have been presented for the construction of behavioural tests necessary to check the correctness of their functioning considered both from an ethical and social point of view. Conducting of such tests should simplify the market approval procedures of AGI systems at the level of manufacturers, the individual users and certification authorities.
Źródło:
Perspektywy Kultury; 2024, 45, 2; 391-404
2081-1446
2719-8014
Pojawia się w:
Perspektywy Kultury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ rozwoju sztucznej inteligencji na bezpieczeństwo energetyczne oraz na zarządzanie inteligentnymi miastami
Impact of artificial intelligence development on energy security and smart city management
Autorzy:
Pietrewicz, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/40213782.pdf
Data publikacji:
2024-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
cyberprzestrzeń
bezpieczeństwo energetyczne
sztuczna inteligencja
inteligentne miasta
test Turinga
cyberspace
energy security
smart cities
artificial intelligence
Turing test
Opis:
The development of technology in recent years has carried with it the rise of new solutions aimed at simplifying many areas of life. One of them is artificial intelligence, the progress of which is definitely noticeable and undeniable. The purpose of the article is to present applications of AI in selected areas most important from the point of view of state management. Also, an attempt will be made to define artificial intelligence by interpreting its basic functions and objectives. The most important fields of AI activity from the point of view of the article are energy security and the development of smart cities. Many examples of solutions and software developed by various companies have been presented. Analysis of the implementation of artificial intelligence in the areas described has shown that today it supports the processes taking place in them, although it is not an essential element of their functioning, it carries significant development potential. In conclusion, it has been shown that the development of artificial intelligence is not free of risks, including overdependence on it, the replacement of human labor with machine labor, and if the development of AI will not encounter an obstacle in the form of undeveloped technology.
Rozwój technologii w ostatnich latach niesie ze sobą równoczesne powstawanie nowych rozwiązań mających na celu ułatwienie wielu dziedzin życia. Jednym z nich jest sztuczna inteligencja, której postęp jest zdecydowanie zauważalny i niepodważalny. Celem niniejszego artykułu jest zaprezentowanie zastosowań AI w wybranych obszarach najważniejszych z punktu widzenia zarządzania państwem. Podjęta zostanie także próba zdefiniowania sztucznej inteligencji poprzez interpretację podstawowych funkcji i założeń. Najważniejszymi dziedzinami działalności AI z punktu widzenia artykułu są bezpieczeństwo energetyczne oraz rozwój inteligentnych miast. Zaprezentowanych zostało wiele przykładów rozwiązań oraz oprogramowań tworzonych przez rozmaite firmy. Analiza zastosowań sztucznej inteligencji w opisanych obszarach wykazała, iż współcześnie znacznie wspomaga ona procesy w nich zachodzące i mimo że nie jest ich niezbędnym elementem funkcjonowania to niesie ze sobą znaczące perspektywy rozwoju. W konkluzji wykazane zostało, iż rozwój sztucznej inteligencji nie jest pozbawiony zagrożeń, w tym zbytniego uzależnienia od niej, zastąpienia pracy ludzi pracą maszyn oraz czy rozwój AI ponownie nie natrafi na przeszkodę w postaci nierozwiniętej technologii.
Źródło:
Nowa Polityka Wschodnia; 2024, 2(41); 61-86
2084-3291
Pojawia się w:
Nowa Polityka Wschodnia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie wielowymiarowych metod statystycznych w diagnozie alfabetyzmu finansowego w Polsce na podstawie testu „wielkiej piątki”
Applying multidimensional statistical methods in the diagnosis of financial literacy in Poland using the Big Five test
Autorzy:
Brzezińska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/40553367.pdf
Data publikacji:
2024-08-02
Wydawca:
Szkoła Główna Handlowa w Warszawie. Kolegium Zarządzania i Finansów
Tematy:
financial literacy in Poland
R software
Big Five test
financial knowledge
categorical data analysis
alfabetyzm finansowy w Polsce
program R
test „wielkiej piątki”
wiedza finansowa
wielowymiarowa analiza statystyczna
Opis:
Wiedza finansowa (ang. financial knowledge) i umiejętność jej zastosowania w praktyce (ang. financial skills, abilities) określają alfabetyzm finansowy (ang. financial literacy). Jak wynika z ostatnich badań, poziom wiedzy finansowej Polaków jest niski na tle zarówno Europy, jak i krajów świata. Stąd też istotna wydaje się potrzeba uporządkowania i usystematyzowania wiedzy w tym obszarze. Ponadto, brakuje rzetelnych narzędzi statystycznych, które pozwalałyby na diagnozę poziomu alfabetyzmu finansowego, dostarczając obiektywnych wyników, a także umożliwiając wdrożenie rozwiązań, których celem byłaby poprawa wiedzy oraz świadomości finansowej. W niniejszym artykule zostaną przedstawione wyniki badań opartych na teście wiedzy finansowej i pytaniach zawartych w kwestionariuszu „wielkiej piątki” (ang. big five), które przeprowadzono w Polsce. Zgromadzone w tym celu dane opracowano z wykorzystaniem wielowymiarowych metod statystycznych przeznaczonych do analizy pozycji testowych i danych jakościowych, a wszelkie obliczenia zostały przeprowadzone w programie R.
Financial knowledge and financial abilities (skills) are understood as financial literacy. As we see from the previous research, the level of financial literacy and knowledge in Poland is low. It is important to fill the existing gap in the area of application of new and modern statistical methods that will allow for measuring the level of financial literacy through objective and reliable tools. In this paper we present results of own research on financial literacy in Poland based on Big Five questions. We apply the R software for statistical analysis.
Źródło:
Studia i Prace Kolegium Zarządzania i Finansów; 2023, 195; 267-282
1234-8872
2657-5620
Pojawia się w:
Studia i Prace Kolegium Zarządzania i Finansów
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A low emission coastal cruise vessel – MV havila capella
Autorzy:
Berg, T.E.
Moe, S.E.
Leinebø, D.
Rabliås, Ø
Powiązania:
https://bibliotekanauki.pl/articles/24201391.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
analogical manoeuvring simulator
in-situ model test
sea trial test
low emission
passenger vessels
batteries
CFD method
wind model
Opis:
Since January 2021, Havila Kystruten has been one of two companies sailing the coastal route between Bergen and Kirkenes. This paper contains information on the new shipping company Havila Kystruten and their 2019 bid for a 10-year operational license to sail the coastal route. The government's tender documents for the new license specified that the vessels operating the route had to be low-emission vessels. This requirement was in line with the government's white paper on the reduction of emissions for commercial and fishing vessels sailing in Norwegian waters. Thus, companies bidding for the new license had to offer new ships with low emission characteristics or rebuild existing vessels to obtain the low emission requirements. Based on the offers, the government decided to split the operational license between two companies. One part was given to the company previously operating the route (Hurtigruten) and the other to the new company Havila Kystruten. While Hurtigruten would rebuild the engine systems on some of their existing vessels, Havila Kystruten would operate the route using new vessels with low emission signature. The design requirements for these vessels were given by Havila Kystruten to the ship designer, Havyard Design and Solutions (now HAVDesign). Some of the requirements are listed in section 4 below. The latter part of this paper investigates the manoeuvring performance of the new Havila Kystruten vessels, containing a summary of a Research Council of Norway funded innovation project on harsh weather ship handling during port operations. The Port of Trondheim was selected as a case study.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 165--170
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Abrasive Wear Mechanisms of S235JR, S355J2, C45, AISI 304, and Hardox 500 Steels Tested Using Garnet, Corundum and Carborundum Abrasives
Autorzy:
Szala, Mirosław
Szafran, Michał
Matijošius, Jonas
Drozd, Kazimierz
Powiązania:
https://bibliotekanauki.pl/articles/2201922.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
abrasion
wear resistance
dry sand-rubber wheel test
tribology
steel
wear mechanism
roughness analysis
failure analysis
Opis:
Wear resistance is one of the main indicators of the reliability of machine parts. The selection of wear-resistant material should consider the operational environment and specific types of abrasive material. The steel abrasive wear resistance depends not only on its hardness and microstructure but also on the abrasive material's properties, such as hardness and particle morphology. This work aimed to determine abrasion wear mechanisms of a set of steels, i.e., S235, S355, C45, AISI 304 and Hardox 500, abraded by different types of grit i.e. garnet, corundum and carborundum. The abrasion tests were conducted using T-07 tribometer (rubber wheel method). Wear traces were examined with a scanning electron microscope (SEM), and a contact profilometer. SEM analysis revealed that apart from Hardox 500, ploughing and microfatigue were the dominant wear mechanisms. Microcutting was the main wear mechanism for Hardox 500 tested with carborundum (SiC). The highest mass loss was usually obtained for carborundum. The lowest wear resistance in garnet and carborundum was obtained for the S235JR and S235J2 steels and Hardox 500 tested with corundum. The effect of steel microstructure on the wear mechanism has been confirmed. AISI 304 austenitic steel abraded by carborundum grit, presented outstanding roughness parameters: Ra, Rz, RSm, Rk, Rvk and Rpk than other steels tested with carborundum. Steel hardness affects the morphology of the wear trace reducing the Ra and Rz roughness parameters. The effect of abrasive hardness and grain morphology on abraded surfaces has been stated. Contrary to fine grains of the hardest carborundum, coarse garnet grains caused high roughness parameters (Rk, Rpk and Rvk) determined in wear trace.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 2; 147--160
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptation and application of a polarisation curve test protocol for a commercial pem electrolyser on cell and stack level
Autorzy:
Jaramillo-Rodríguez, Nicol Daniela
Luxa, Aline
Jürgensen, Lars
Powiązania:
https://bibliotekanauki.pl/articles/2233070.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
PEM
water electrolysis
test protocol
electrochemical characterisation
polarisation curves
Opis:
The present study aims to develop a test protocol based on the literature for electrochemical characterisation of a polymer electrolyte membrane (PEM) electrolysis commercial stack using polarisation curves. For this, a 1-kW water electrolysis test stand with integrated temperature control and measurement systems was built around the stack. Afterwards, the stack performance was characterised under different operating pressure and temperature conditions by using polarisation curves. A measurement protocol was developed based on the literature. To ensure the reproducibility of the results, two rounds of experiments were performed. The experiments were carried out at temperatures between 20 and 60 °C and pressures up to 15 bar. The results show distinct regions in the polarisation curves related to the activation and ohmic overvoltage. The effect of temperature and pressure on the performance is shown and analysed. The performance of single cells in the stack is also measured. The stack polarisation curves are compared with those in the literature, which gives an understanding of the materials used in electrodes and types of membranes.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 3; 395--404
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An innovative approach to fabrication with photo-cured resins by shell-printed-core-casting
Autorzy:
Szymczyk, Emil
Rećko, Maciej
Dzierżek, Kazimierz
Sapiołko, Karol
Powiązania:
https://bibliotekanauki.pl/articles/27314316.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
stereolithography
resin
printing
casting
curing
tensile test
bending
Opis:
Modified LCD-based method was used to print three-dimensional (3D) elements. This innovative method combines printing the external shell and filling, thus obtaining mould by casting resin. In order to compare the properties of prints obtained with this method with the ones fabricated in a standard procedure, we conducted bending tests of vertically/horizontally printed and shell-printed cast specimens. The shell-cast samples showed higher flexural strength and larger values of apparent Young’s modulus. The presented results also concern the kinetics of curing samples obtained with different fabrication routes.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 4; 485--489
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of exhaust emission processes during the Real Driving Emissions test
Autorzy:
Andrych-Zalewska, Monika
Powiązania:
https://bibliotekanauki.pl/articles/27311805.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
RDE test
exhaust emission
combustion engine
operating states
test RDE
emisja spalin
silnik spalinowy
badanie silnika
Opis:
The article deals with the study of exhaust emissions from a combustion engine in the Real Driving Emission (RDE) test. These tests are a simulation of real conditions of use of motor vehicles. Nowadays, RDE tests are mandatory for Light Duty Vehicle (LDV) and Heavy Duty Vehicle (HDV) vehicles and in the future, restrictive standard. Euro 7, which combines stricter limits with a comprehensive RDE test cycle, is becoming a challenge for current vehicle engineering. The paper presents the results of pollutant emission tests from a passenger car (PC). In the tests of LDV in the RDE test, the results of which are analyzed in the article, the Portable Emissions Measurement System (PEMS) mobile exhaust emission testing system was used. The processes describing the operating states of the vehicle and the combustion engine, as well as the processes of exhaust emission intensity and the intensity of the number of particulate (PN), were examined. The correlation between the considered processes was investigated. The emission of carbon monoxide, hydrocarbons, nitrogen oxides, particulate and carbon dioxide as well as the road PN were examined. The zero-dimensional statistical characteristics of the examined processes were also determined. The probability density and power spectral density of the processes were established. A great diversity was found in the properties of the process distributions, as well as in the dynamic properties of the processes. In the summary of the analysis of the results of the car speed process, the operating states of the combustion engine and the processes of exhaust emission intensity and the process of the intensity of PN in the RDE test, conclusions were formulated regarding, among others, course of the intensity of these compounds, correlation of the processes of pollution emission intensity and the intensity of the PN with the process of car speed, distribution of processes.
Źródło:
Archives of Transport; 2023, 66, 2; 123--148
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Ring Spun Yarn Wickability Using the Post-Hoc Test
Autorzy:
Elkateb, Sherien N.
Powiązania:
https://bibliotekanauki.pl/articles/24200942.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
wickability
ring spun yarn
ANOVA
Post hoc test
Bonferroni alpha
Opis:
Yarn wickability achieves high thermo-physiological comfort. Therefore, this paper aimed to investigate yarn wickability and analyze statistically factors affecting yarn wicking performance. Methodology consists of testing wicking height for ring spun yarn produced from three levels of fibre types and twist factors at two levels of doubling. Statistical tools such as ANOVA, T-test and Post-hoc tests analyzed the impacts on wicking heights. Findings showed that the Post-hoc test represented the variation between groups more accurately than ANOVA. Furthermore, a comparison of Bonferroni Alpha with T-test p-values revealed that yarn wicking was significantly affected by interactions of fibre type, doubling, and twist level.
Źródło:
Fibres & Textiles in Eastern Europe; 2023, 31, 1; 78--82
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 3204

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