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Wyświetlanie 1-5 z 5
Tytuł:
Indoor air studies of fungi contamination in two kindergartens in Kavala, Greece
Autorzy:
Łukaszuk, C.
Krajewska-Kułak, E.
Chatzopulu, A.
Theodosopoulou, E.
Powiązania:
https://bibliotekanauki.pl/articles/1917817.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Indoor air fungi
kindergartens
SAS Super 100
Opis:
Introduction: Fungi and moulds are biological hazards that are ubiquitous both in the communal and occupational environments. The aim of the study was to assess the presence of airborne fungi in two kindergartens in Kavala, Greece. Materials and methods: Materials for the tests were: the air samples (in front of the buildings and the selected rooms) of the two kindergartens. The first Kavala kindergarten was located atop a hill and the second in the city center. The air pollution was determined using SAS SUPER 100. Results: The mean number of fungal colonies isolated from air of the kindergarten rooms in the city center was 478.3±148.4 CFU/m3. The mean number of fungal colonies isolated from air of the kindergarten on the hill was 343.6±188.8 CFU/m3. Aspergillus niger was most frequently isolated in air samples from the kindergarten rooms in the city center, while Penicillium species predominated the kindergarten rooms on the hill. CFU values in the air samples outside the kindergartens were higher in the center than on the hill of Kavala. CFU values of the examined air samples are varied. In the kindergarten rooms in the center of Kavala the most frequently isolated species was Aspergillus niger, and in the kindergarten on the hill it was Penicillium species. Conclusions: The present study demonstrated considerable numbers of fungi in the air in two kindergartens in Kavala, Greece.
Źródło:
Progress in Health Sciences; 2016, 6(1); 123-129
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sentiment analysis of Twitter data using emoticons and emoji ideograms
Analiza wydźwięku danych z Twittera z wykorzystaniem emotikonów i emoji
Autorzy:
Wolny, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/587197.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
SAS
Sentiment analysis
Symbol analysis
Twitter
Analiza symboli
Analiza wydźwięku
Opis:
Twitter is an online social networking service where worldwide users publish their opinions on a variety of topics, discuss current issues, complain, and express positive or negative sentiment for products they use in daily life. Therefore, Twitter is a rich source of data for opinion mining and sentiment analysis. However, sentiment analysis for Twitter messages (tweets) is regarded as a challenging problem because tweets are short and informal. This paper focuses on this problem by the analyzing of symbols called emotion tokens, including emotion symbols (e.g. emoticons and emoji ideograms). According to observation, these emotion tokens are commonly used. They directly express one’s emotions regardless of his/her language, hence they have become a useful signal for sentiment analysis on multilingual tweets. The paper describes the approach to performing sentiment analysis, that is able to determine positive, negative and neutral sentiments for a tested topic.
Twitter jest ogólnoświatowym serwisem, w którym użytkownicy publikują swoje opinie na różne tematy, dyskutują na temat bieżących wydarzeń oraz wyrażają pozytywne bądź negatywne opinie o produktach, których używają w codziennym życiu. Z tego powodu Twitter jest potężnym źródłem danych do badania opinii i analizy wydźwięku. Jednak analiza wydźwięku komunikatów na Twiterze (tweetów) uważana jest za problem, będący zarazem wyzwaniem, z powodu niewielkiej objętości tekstu tweetów i często nieformalnego charakteru ich języka. Artykuł skupia się na analizie symboli znanych jako emotikony i emoji. Zgodnie z przeprowadzonymi badaniami, symbole te są powszechnie używane w komunikacji za pomocą Twittera. Wyrażają one bezpośrednio emocje niezależnie od języka, dlatego mogą być używane w wielojęzycznych tekstach. W artykule przedstawiono podejście do analizy wydźwięku umożliwiającej określenie pozytywnego, negatywnego lub neutralnego wydźwięku badanych tekstów.
Źródło:
Studia Ekonomiczne; 2016, 296; 163-171
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of Aggregatic Stability and Bactericidal Activities of Nanosilver Colloidal Solutions
Autorzy:
Yushchishina, Anna
Pasichnyk, Maria
Mitryasova, Olena
Koszelnik, Piotr
Gruca-Rokosz, Renata
Kida, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/1811619.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
colloidal solution
nanosilver
surface-active substances
SAS
aggregate resistance
bactericidal action
Opis:
The influence of SAS of different chemical nature on aggregate stability and bactericidal action of nano silver colloidal solutions is investigated. Colloidal solutions of silver were obtained by restoring the argentum nitrate agent in a neutral medium. With the help of spectrophotometric method, it has been proved that such solutions are characterized by high aggregate stability compared with the use of other traditional reducing agents. Anionic SAS (sodium dodecylsulfate and sulfanol) and nonionic SAS (OS-20) increase aggregate stability of nano silver solutions, while cationogenic SAS − alcamone promotes rapid coagulation and aggregation of nano silver particles. The study of bactericidal action of the solutions to the E.coli are showed that the nano silve colloidal solution with or without presence of OS-20 and alcamone completely inhibit the growth of colonies of E.coli, that is, it’s have high bactericidal properties.
Źródło:
Rocznik Ochrona Środowiska; 2020, Tom 22, cz. 1; 40-50
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of hardware-in-the-loop test bench for evaluating steering wheel angle sensor performance for steer-by-wire system
Autorzy:
Pietruch, Michał
Wetula, Andrzej
Młyniec, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2173902.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steering wheel angle sensor
SAS
steer-by-wire
hardware-in-the-loop
virtual test drives
Opis:
In recent years, the Steer-by-Wire (SBW) technology has been gaining popularity and replacing classical steering systems. It plays the most crucial role in autonomous cars where the vehicle must perform maneuvers on its own without driver’s intervention. One of the key components of this system is the steering wheel angle sensor (SAS). Its reliability and performance may affect driver’s life and health. The purpose of this paper is to show a test system to comprehensively evaluate the performance of the steering wheel angle sensor in the SBW system during real-world maneuvers and show how SAS parameters such as accuracy of angle, angular speed etc. affect car trajectory resulting in hit cones. For this purpose, a test system was built, with the use of virtual test drives based on CarMaker software, CANoe and VTSystem hardware. In order to evaluate its performance, the errors introduced by the system were determined. Additionally, using the realised test system, three commercial steering wheel angle sensors were tested and compared during a virtual test drive. Their errors were determined, as well as their performance in the SBW technology and the consistency of the obtained results with the parameters declared by the manufacturer were verified as well.
Źródło:
Metrology and Measurement Systems; 2022, 29, 4; 639--653
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An investigation of ship airwakes by scale adaptive simulation
Autorzy:
Shukla, S.
Singh, S. N.
Sinha, S. S.
Vijayakumar, C.
Powiązania:
https://bibliotekanauki.pl/articles/116802.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
applications for navy
ship airwakes
Scale Adaptive Simulation (SAS)
simulation
flow phenomena
turbulent structures
investigation by simulation
ship airwakes flow characteristic
Opis:
An early assessment of the ship airwakes flow characteristic is one of the most challenging tasks associated with the designing of vessels. The presence of ship airwake creates very complex flow phenomena due to the presence of strong velocity gradients in space and time and widely varying high levels of recirculation and turbulence. Under such condition, the landing and take-off operation of a helicopter over the ship helodeck is very complex and accurate prediction represents a computational challenge. We present time-accurate scale-adaptive simulation (SAS) of turbulent flow around a simple frigate ship to gain insight into the flow phenomena over the helodeck. Numerical analysis is carried out after several grids and time-steps refinement to ensure the spatial and temporal accuracy of the numerical data. The instantaneous iso-surface of eddy flow structures and vorticity have been analysed across the vertical and longitudinal plane. Results show good agreement with experimental data. Comparisons of mean quantities and velocity spectra show good agreement, indicating that SAS can resolve the large-scale turbulent structures which can adversely impact ship-helo combined operations. Overall, the SAS approach is shown to capture the unsteady flow features of massively separated ship airwake characteristics with reasonable accuracy.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 471-475
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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