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Wyszukujesz frazę "de-icing" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
Impact of salts from winter road maintenance on selected properties of roadside soils
Autorzy:
Świdwa-Urbańska, J.
Obrzut, P.
Ogiela, E.
Powiązania:
https://bibliotekanauki.pl/articles/101468.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
roadside soils
road salts
road de-icing
Opis:
The impact of winter addition of salts to roadside soils was studied for the national road No. 28 in Poland, in Małopolska Region. The measured sections of the road No. 28 are two access ways to the city of Grybów. According to instructions of GDDiKA (General Directorate for National Roads and Motorways) both sampled routes: Grybów–Gorlice (sampling section G-G) and the section Nowy Sącz-Grybów (N-G) were included in II standard of winter road maintenance. The general increase in soil salinity, chloride concentration and pH values from the roadside soils was evidenced by the difference of results of two sampling campaigns, before and after winter season of 2015/16. Salinity indicators showed significant increase, even though weather winter season 2015/16 was rated as mild and road de-icing salts were applied at less-than-average rate. Soil hydraulic properties were calculated estimated from soil texture using pedo-transfer functions for estimating the dynamics of salts into soils, suggesting easy leaching of salts from topsoil.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2016, IV/3; 1521-1534
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of a Model of Current Distribution in the Overhead Contact Lines for an Innovative de-Icing System
Autorzy:
Skrzyniarz, Marek
Kruczek, Włodzimierz
Mike, Kamil
Stypułkowski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2116438.pdf
Data publikacji:
2022
Wydawca:
Instytut Kolejnictwa
Tematy:
simulation model
de-icing
contact line
current flow
Opis:
Icing on the overhead contact line exclude the possibility of efficient current collection from the overhead contact line. The effects oficing can result in losses for carriers due to delay or cancellation of trains and also cases of damage to the traction infrastructure and pantographs. Th e existing methods of de-icing the traction network (mechanical, chemical and electrical) are currently ineffective. Therefore, it is necessary to develop a new electrical method that takes into account the detailed current flow in the overhead contact line. This article presents a model for calculating the current flow in the overhead contact line and the resistances of droppers, suspension elements, and distance holders measured on the basis of actual measurements.
Źródło:
Problemy Kolejnictwa; 2022, 195; 135--139
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of trace elements pollution in snow piles removed from residential areas in Perm, Russia
Autorzy:
Ushakova, Evgeniya
Menshikova, Elena
Karavaeva, Tatiana
Puzik, Alexey
Volkova, Margarita
Vaganov, Sergey
Powiązania:
https://bibliotekanauki.pl/articles/2203544.pdf
Data publikacji:
2023
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
contamination level
de-icing agents
phytotoxicity
pollution sources
snow quality
Opis:
Atmospheric deposition, vehicular transportation and de-icing agents are major sources polluted snow in urban. This study investigates the current trace elements concentrations of snow and de-icing using ICP-MS, and phytotoxicity using three vascular plants in snow. The study assesses the contamination, classification and phytotoxicity of snow quality removed from roads of residential areas and piled on children’s playgrounds in residential territories. The research found that according to Russian environmental quality standard for water has been identified the exceeding trace elements in snow by W, Se, Mn, Cu, V, Mo, Ni and Zn. The pollution indices (PLI, CF and Zc) were identified pollution level of snow piles from moderate contamination to very high contamination. Based on average germination index values for Sinapis alba L., Lepidium sativum L., and Triticum aestivum L., the degree of inhibition in snow piles varied from no inhibition to strong inhibition. The trace elements content in de-icing “Galit А” and salt sand mix are defined in the following descending order: Zn > Mn > Ba > V > Rb > Sr and Mn > Ba > Cr > V > Sr > Ni, respectively. High concentrations of trace elements in snow piles are a source of environmental pollution. To prevent snow storage and disposal in residential areas should be involved in future studies of environmental pollution and circular economy, so that environmental managers can reduce threats to the environment and public health, as well as initiate circular economy projects in urban areas.
Źródło:
Journal of Water and Land Development; 2023, 56; 109--117
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrothermal Properties and RF Transmittance of Spray-coated CNT Thin Film for Radome De-icing Application
Autorzy:
Jung, Jun Hyuk
Hong, Jiwon
Kim, Youngryeul
Yong, Seok-Min
Park, Jinwoo
Lee, Seung Jun
Powiązania:
https://bibliotekanauki.pl/articles/351163.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
De-icing
CNT thin film
spray coating
electrothermal property
RF transmittance
Opis:
Ice formed on radome surfaces causes communication disruption due to radio-frequency interference (RFI), which reveals the importance of de-icing systems for radomes. As a radome de-icing application, in this work, carbon nanotube (CNT) thin films were fabricated using a spray-coating method, and influence of process parameters on RF transmittance and electrothermal propertieswas investigated. With the increase of spraying time, sheet resistance of the fabricated film decreases, which results in a decrease of the RF transmittance and improvement of the heating performance. Also, the de-icing capability of the fabricated CNT film was evaluated at –20°C, and efficient removal of ice under cold conditions was demonstrated.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1011-1014
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the de-icing salt on the deterioration of rock materials used in monumental buildings
Autorzy:
Kłopotowska, A. K.
Łukaszewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/178339.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
osadzanie się soli
odladzanie
sól drogowa
surowce skalne
budynki
piaskowce
budowle zabytkowe
de-icing
road salt
rock materials
buildings
salt deposition
sandstone
Opis:
The de-icing salt has been used for decades to increase safety on the roads and sidewalks. In Poland, mainly the sodium chloride is used in order to maintain the roads in good condition during winter. Like other salts used for surface de-icing, it depresses the freezing point to lower temperatures and has an additional thermal effect by an exothermic reaction. However, this salt causes the accumulation of chlorides in the walls and stone buildings contributing to the deterioration of these facilities. The paper addresses the issue of the influence of salt solutions on the structure and geomechanical properties of rocks at negative temperatures. The study was conducted on the basis of cyclic tests which simulate complex action of both the negative temperature and the salty environment. The conditions for the tests were chosen so as to reflect the actual conditions of the winter in Poland. During the tests, the longitudinal wave propagation velocity, changes in weights of the samples as well as visual changes were recorded which allowed continuous tracking of occurring changes. At the end of the tests, the rock samples were subjected to uniaxial compressive tests. For this purpose, four lithological types were chosen, representing the sedimentary rocks: clastic and carbonate, widely used in stone constructions.
Źródło:
Studia Geotechnica et Mechanica; 2013, 35, 3; 57-68
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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