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    Wyświetlanie 1-13 z 13
    Tytuł:
    On regulated functions
    Autorzy:
    Banaś, J.
    Kot, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/357765.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    monotonic function
    function of bounded variation
    step function
    regulated function
    Banach space
    funkcja monotoniczna
    funkcja o ograniczonej zmienności
    funkcja krokowa
    funkcja regulowana
    przestrzeń Banacha
    Opis:
    The main purpose of this review article is to present the concept of a regulated function and to indicate the connection of the class of regulated functions with other significant classes of functions. In particular, we give a characterization of regulated functions in terms of step functions and we show that the linear space of regulated functions forms a Banach space under the classical supremum norm.
    Źródło:
    Journal of Mathematics and Applications; 2017, 40; 21-36
    1733-6775
    2300-9926
    Pojawia się w:
    Journal of Mathematics and Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Cathodic Protection on Corrosion of Water-pipe Network in Kraków - Case Study
    Autorzy:
    Lelek-Borkowska, U.
    Gruszka, M.
    Banaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079831.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    materials
    water pipelines
    corrosion
    cathodic protection
    materiały
    wodociągi
    korozja
    ochrona katodowa
    Opis:
    The paper is a summary of a project aimed at identifying and eliminating or minimizing the causes of frequent failures of the Krakow water supply network related to corrosion damage. The paper presents the method of searching for factors responsible for frequent corrosion damage. There were taken into account several factors that may destroy the pipes associated with corrosion processes, such as the composition of the water, aggressiveness of ground, or stray currents. The monitoring method of the corrosion processes applied to observe the condition of the water supply network was discussed. The study showed that the main problem appeared to be stray currents related to the electrical infrastructure widely present in a large city, such as a tram or railway network. To eliminate this threat, a cathodic protection system has been implemented to prevent further failures. There were also demonstrated results of research proving that the applied solutions are effective.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 3; 59-64
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badanie katodowych produktów powstałych na powierzchni niklu w bezwodnych roztworach elektrolitów
    The Study of Cathode Products Generated on the Surface of the Nickel Electrode in Anhydrous Solutions of Electrolyte
    Autorzy:
    Bisztyga, M.
    Lelek-Borkowska, U.
    Banaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380763.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nikiel
    elektroda niklowa
    metanol
    redukcja katodowa
    analiza powierzchni
    mikroskopia elektronowa
    nickel
    nickel electrode
    methanol
    cathodic reduction
    surface analysis
    electron microscopy
    Opis:
    W artykule przedstawiono metodykę i wyniki badań, jakie otrzymano identyfikując produkty procesów elektrodowych zachodzących w bezwodnych metanolowych roztworach 0.05M CH3ONa – 0.05M LiCl na powierzchni elektrody niklowej. W badaniach wykorzystano spektroskopię w podczerwieni z techniką całkowitego wewnętrznego odbicia (FTIR-ATR). Ponadto przeprowadzono analizę powierzchni elektrody niklowej, po katodowej redukcji przy określonych potencjałach, za pomocą skaningowej mikroskopii elektronowej SEM wraz z analizą badań EDX.
    The paper presents the identifying of morphology and composition of surface products occurring on nickel electrode during cathodic polarization in the anhydrous CH3OH – 0.05M CH3ONa – 0.05M LiCl. SEM, EDX and in situ infrared spectroscopy (FTIR-ATR) were used for analysis of surface layer. The investigations showed that nickel electrode undergoes “pseudopassivation” in cathodic range in course of formation of nickel methoxide film. The mechanism of passivation process has been proposed.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4 spec.; 13-16
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cathodic Reactions on the Surface of Nickel in Methanol Solutions of Electrolytes
    Reakcje katodowe na powierzchni niklu w metanolowych roztworach elektrolitów
    Autorzy:
    Bisztyga, M.
    Lelek-Borkowska, U.
    Banaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381903.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    methanol solution
    nickel
    cathodic reduction
    roztwór metanolowy
    nikiel
    reakcja katodowa
    Opis:
    This paper concerns the cathodic reactions occurring on the surface of nickel in methanolic solutions of electrolytes. Methanol reduction process, in this potential range, is inhibited by formation of surface compound, product of reaction parallel to methanol reduction – oxidation of nickel with participation of CH3OH molecules. Competitive processes, formation of surface product (reaction of metal surface with methanol) and its dissolution (reaction of surface product with complexing agent), decide about free surface area on which can occur reduction of methanol. Presence of complexing agents – CH3O- and Cl- anions, causes “cleaning” the surface of surface anodic product and thereby facilitates cathodic reduction of methanol (reactions 3, 5, 6, 7). Removing of surface product is the process controlled by diffusion of anions to the electrode surface.
    Praca poświęcona jest reakcjom katodowym zachodzącym na powierzchni niklu w metanolowych roztworach elektrolitów w obszarze małych nadpotencjałów katodowych. W obszarze tym proces redukcji metanolu hamowany jest tworzeniem powierzchniowego produktu będącego rezultatem równoległej do redukcji metanolu reakcji utleniania niklu z udziałem cząsteczek CH3OH. Konkurencyjne procesy tworzenia produktu powierzchniowego (reakcja powierzchni z metanolem) i roztwarzania (reakcja produktu powierzchniowego z czynnikiem kompleksującym), decydują o obszarze swobodnej powierzchni na której zachodzi redukcja metanolu. Obecność czynników kompleksujących – anionów CH3O- oraz Cl- powoduje „oczyszczanie” powierzchni z produktu anodowego i ułatwia tym samym redukcję katodową metanolu (reakcje 3,5,6,7). Proces usuwania produktu powierzchniowego jest procesem kontrolowanym dyfuzją anionów do powierzchni elektrody.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3 spec.; 5-10
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zwiększenie efektywności inwentaryzacji lasu metodą losowania warstwowego
    Improving effectiveness of forest inventory by stratified sampling
    Autorzy:
    Banaś, J.
    Drozd, M.
    Zięba, S.
    Bujoczek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/986979.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    inwentaryzacja lasu
    losowanie warstwowe
    poprawa efektywnosci
    sampling design
    inventory precision
    stratified sampling
    Opis:
    The purpose of the stratification is to group stands basing on the homogeneity of the measured feature. During periodic forest inventory in Poland, strata are created on the basis of age and the main species in stand within the boundary of forest district. In this work an improvement of distinguishing the strata during the forest inventory is presented. Three variants are considered: (1) distinguishing homogeneous strata in boundary of the whole forest district, not separately in forest subdistricts, (2) splitting species−aged strata into homogeneous substrata with respect to site quality, and (3) dividing strata of stands in the regeneration class with respect to stand density. Study was conducted in four mountain forest districts located in the Kłodzko Basin (SW Poland). Total area of these stands amounted to 43,052 ha, where 6,648 sample plots were established during the periodic inventory. ANOVA was used to test significance of the differences in tree volume and to assess variability reducing in distinguished substrata. Results indicated that in stands with age up to 70 years mean volume of trees on the sample plot does not differ significantly between sites, but in older stands difference was significant. Dividing age−species strata of stands older than 70 years into substrata according to site conditions influenced reduction of volume variability from 10 to 57% in newly created substrata. Dividing strata consisted of stands in regeneration class according to stand density index allowed to decrease the volume variability from 9 to 20%. Mean volume of trees in stands on similar sites does no differ significantly between subdistricts in the same forest district. Strata distinguished within the whole forest district are bigger and represented by more sample plots than on the subdistrict level, which significantly reduced standard error of volume and improved effectiveness of stratification in forest inventory.
    Źródło:
    Sylwan; 2017, 161, 10; 804-811
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inwentaryzacja martwego drewna statystyczną metodą reprezentacyjną z zastosowaniem warstw gatunkowo-wiekowych
    Inventory of deadwood by the means of a statistical representative sampling method using species-age layers
    Autorzy:
    Bujoczek, L.
    Bujoczek, M.
    Banaś, J.
    Zięba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/989002.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drewno martwe
    miazszosc drewna
    zasoby drzewne
    szacowanie zasobow
    metody statystyczne
    typy siedliskowe lasu
    gatunki panujace
    wiek drzewostanu
    coarse woody debris
    snags
    measurements
    accuracy
    Opis:
    According to the current forest management manual, deadwood volume should be evaluated on 10% of sampling plots, located in different species−age layers, which are used for determining stand volume in a given forest unit. Sampling plot size differs depending on tree stand age and ranges from 0.005 to 0.05 ha. The results are reported for the entire forest district and by forest site type. The objective of the study was to analyze the accuracy of deadwood volume estimations in the light of the guidelines stipulated in the forest management manual and to find the ways to improve the obtained results. Deadwood volume was measured on 2752 sample plots used to determine stand volume and the mean value calculated on that basis was 5.4 m³/ha. Subsequently, 30 random draws of sampling plots were performed. Estimates based on randomly selected pools consisting of 10% of sampling plots ranged from 3.5 to 8.6 m³/ha. Subsequently, another 10% of sampling plots were randomly drawn and added to the previous ones. The results for 20% of sampling plots were 4.5−7.0 m³/ha, for 30% – 4.3−6.4 m³/ha, for 40% – 4.6−6.4 m³/ha and for 50% – 4.7−6.0 m³/ha. In the next step, 225 sampling plots located in reserves and special zones around the nests of protected species were discarded. The mean volume of deadwood computed for the managed forest areas alone (2527 sample plots) was 4.7 m³/ha. The random drawing procedure was repeated to give the following results: 3.6−6.8 m³/ha for 10% of sampling plots; 3.8−5.8 m³/ha for 20%; 3.9−5.3 m³/ha for 30%; 4.2−5.3 m³/ha for 40%; and 4.2−5.1 m³/ha for 50% of sampling plots. The categorization of the randomly selected sampling plots by forest site type in most cases yielded results significantly differed from the values computed based on all sampling plots. It was found that estimates based on 10% of sampling plots may diverge considerably from true values due to the uneven distribution of deadwood. In particular, managed and unmanaged forest areas should not be combined due to the high differences in the volume of deadwood between them. If a relatively low number of sampling plots is used, it seems advisable to report results only for the forest division as a whole, without a breakdown into site types. Satisfactory estimates for the different forest sites types would require much more work. The use of a greater number of sampling plots than specified in the forest management manual seems to be a fundamental prerequisite for improving the accuracy of deadwood volume estimates.
    Źródło:
    Sylwan; 2017, 161, 02; 114-123
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena funkcjonowania modeli ryzyka uszkodzenia drzewostanów przez wiatr w górach na przykładzie Tatrzańskiego Parku Narodowego
    Assessment of the risk models of the wind damage to the stands in the mountains - the Tatra National Park case study
    Autorzy:
    Zięba, S.
    Doleżuchowicz, M.
    Banaś, J.
    Bujoczek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/989579.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy gorskie
    wiatry
    huragany
    szkody w lesie
    szkody od wiatru
    uszkodzenia drzewostanow
    modele ryzyka uszkodzenia
    Tatrzanski Park Narodowy
    norway spruce
    damaged from the wind
    mountain forests
    forestry planning
    regional planning
    Opis:
    The paper assesses the performance of the risk models of the wind damage to the mountain forest stands located in the Tatra National Park (southern Poland). The models assume that the forest susceptibility to the damage from the wind depends on the characteristics of stands, their location and frequency of the occurrence of damage in the past. According to the methodology we built 5 variants of models, which take into account the following attributes: various stand features, forest type, regional factor of the damage to the the trees, thickness scrap, subversive and deadwood from the stand in the last 10 years, characteristics of the terrain: exhibition, slope inclination and altitude above sea level. The model output is a classification of the stand susceptibility to the wind damage expressed by a number between 0 and 3 (0.5 interval). The suitability of each variant was tested by comparing the in−class rate as well as the area and growing stock of undamaged and damaged stands. In this study we rated 2908 stands with a total area of 15,386.05 ha. Taking into account the risk class, it is possible to develop the appropriate procedures in order to limit the damage. The analysis conducted for the forests of the Tatra National Park showed high compliance of the developed risk models with the damages arising by the wind. This is confirmed by a particularly high proportion of damaged forest stands included in the class of high risk. Their fraction ranged from 43.8% (WR1) to 92.4% (WR5). Considering the position and stands characteristics the greatest damage arose at an altitude of 950 to 1000 m (70.2%) and the exposures NW, N and NE (60.2%).
    Źródło:
    Sylwan; 2016, 160, 05; 378-387
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany bieżącego przyrostu miąższości wybranych drzewostanów jodłowych Leśnego Zakładu Doświadczalnego w Krynicy w latach 1971-2011
    Changes of the current annual volume increment in selected fir stands in the Forest Experimental Station in Krynica in 1971-2011
    Autorzy:
    Banaś, J.
    Bujoczek, L.
    Drozd, M.
    Zięba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/994912.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    LZD Krynica
    drzewostany jodlowe
    przyrost miazszosci
    przyrost biezacy miazszosci
    current increment
    silver fir
    poland
    Opis:
    The paper describes the changes in the current annual volume increment of fir stands in the Forest Experimental Station in Krynica in 1971−2011. The research material are the results of five−fold measurements of stands on 238 control sample plots using an inventory and control method based on the statistical and mathematical system. On average, current annual volume increment in the 1970s amounted to 6.10 m³/ha/year, while in the 1980s to 8.46 m³/ha/year, in 1990s to 10.52 m³/ha/year and to 13.42 m³/ha/year in the last decade (2001−2011).
    Źródło:
    Sylwan; 2012, 156, 12; 908-913
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dokładność określenia zasobności na poziomie warstw gatunkowo-wiekowych w obrębowej metodzie inwentaryzacji
    Accuracy of volume determination on the level of age-species layers in the stratified sampling method
    Autorzy:
    Banaś, J.
    Drozd, M.
    Bujoczek, L.
    Zięba, S.
    Zygmunt, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/986687.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    powierzchnie probne
    forest inventory
    stratification
    standard error
    sample plot
    variability coefficient
    lesnictwo
    drzewostany swierkowe
    warstwy gatunkowo-wiekowe
    inwentaryzacja lasu
    zasobnosc drzewostanu
    miazszosc drzewostanow
    metoda obrebowa
    dokladnosc pomiaru
    Opis:
    Statistical representative method of inventory based on stratified sampling is used for elaborate forest management plans in Poland. Strata are created according to the dominant tree species and age of stands. First stratum include stands with age from 21 to 30 years and the interval in the next strata is 10 years. Sample plot size depends on stand age and varies from 0.005 to 0.05 ha. According to the allocation pattern number of samples is proportional to age and total area of stands in a stratum. Diversification of number and size of sample plots has a profound influence of inventory precision in an age classes. The aim of the study is to analyse the accuracy of the stand volume determination on the level of age−species strata. Research was conducted based on the data obtained from periodic forest inventory in seven mountainous forest subdistricts located in the Kłodzko Basin (SW Poland). Norway spruce stands with total area of 39,935.45 ha and 6102 sample plots were chosen for analysis. Sampling fraction, mean number and volume of trees on a sample plot, coefficient of volume variability and standard error of volume were calculated for each stratum in analyzed forest subdistricts. Sample plots with size of 0.005 ha established in young stands (21−30 years) are characterized by small number of trees (4.3−7.6 in average) and the highest coefficient of volume variability (93%). Additionally, because of low age of stands, the number of plots is also small (18 on average), which influences the low precision of volume inventory in this stratum. Standard error of volume was on the mean level of 23% in the youngest age stratum and decreased with age of stands to 5% in the stands of 41−71 years and below this level in the strata with the older stands. Increasing the plot size in the youngest stratum will be effective way to improve accuracy of forest inventory in the method based on stratified sampling.
    Źródło:
    Sylwan; 2017, 161, 09; 715-722
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the Effect of Environmental Factors on the Corrosion of Water Distribution System Based on Analysis of On-line Corrosion Monitoring Results
    Autorzy:
    Jażdżewska, A.
    Gruszka, M.
    Mazur, R.
    Orlikowski, J.
    Banaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/355721.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    water distribution system
    acid rain
    corrosion monitoring
    online
    linear polarization method
    Opis:
    Corrosion of water distribution system is a significant issue causing problems with quality, safety and continuity of distribution. The changes of corrosion rates of the water distribution systems in Cracow made of carbon steel were investigated by analysis of online corrosion monitoring system results. Corrosion rates were determined using the linear polarization method. The impactof rain, temperatures, conductivity, dissolved oxygen content on corrosion rate were characterized. The corrosivity of different water sources like mountain water, underground water or river water were indicated. The possible actions for reducing corrosion losses were characterized. Results show that pollution of the environment in the form of acid rain and runoff from agriculture as well as the type of the source water has significant influence on corrosion of water distribution system. Corrosion monitoring system gives possibility of controlling corrosion rate by mixing waters from different sources in the way to obtain less corrosive mixture. (see Fig 8).
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 109-116
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda określania średniego wieku gospodarstwa w przerębowo-zrębowym sposobie zagospodarowania lasu
    Method of assessment average age of forest range in shelter wood cutting system
    Autorzy:
    Banaś, J.
    Zięba, S.
    Bujoczek, L.
    Zygmunt, R.
    Drozd, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989920.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    gospodarstwa lesne
    gospodarstwa przerebowo-zrebowe
    drzewostany
    struktura drzewostanu
    struktura wiekowa
    klasy wieku
    sredni wiek drzewostanu
    wiek odnowienia
    odnowienia podokapowe
    age class structure
    average age of stands
    regeneration class
    upgrowth
    Opis:
    The study describes a new method of assessing the average age of the forest range with significant share of stands in the regeneration class. In proposed method, average age of stands in regeneration layer is calculated as a mean age of tree layer as well as layer of upgrowth, recruitment and saplings weighed by these layers fraction. Example of calculation of average age was performed for 7 ranges located in Kotlina Kłodzka (SW Poland) with total area of 48 653 ha. Average age of stands calculated by proposed method vary from 62 to 73 years and is lower in comparison to average age calculating according to current regulations from 5 to 14 years. Proposed method of calculation the average age of stands in shelter wood cutting system takes into account composed structure of stands in regeneration period by using age and share of all trees generation in stand.
    Źródło:
    Sylwan; 2015, 159, 09; 732-739
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photosensitization of TiO2 P25 with CdS Nanoparticles for Photocatalytic Applications
    Autorzy:
    Trenczek-Zając, A.
    Banaś, J.
    Świerczek, K.
    Zazakowny, K.
    Radecka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352507.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    semiconductors
    X-ray diffraction
    transmission electron microscopy TEM
    catalytic properties
    optical properties
    Opis:
    A TiO2/CdS coupled system was prepared by mixing the TiO2 P25 with CdS synthesized by means of the precipitation method. It was found that the specific surface area (SSA) of both components is extremely different and equals 49.5 for TiO2 and 145.4 m2·g-1 for CdS. The comparison of particle size distribution and images obtained by means of transmission electron microscopy (TEM) showed agglomeration of nanocomposites. X-ray diffraction (XRD) patterns suggest that CdS crystallizes in a mixture of cubic and hexagonal phases. Optical reflectance spectra revealed a gradual shift of the fundamental absorption edge towards longer wavelengths with increasing CdS molar fraction, which indicates an extension of the absorption spectrum of TiO2. The photocatalytic activity in UV and UV-vis was tested with the use of methyl orange (MO). The Langmuir–Hinshelwood model described well the photodegradation process of MO. The results showed that the photocatalytic behaviour of the TiO2/CdS mixture is significantly better than that of pure nanopowders.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 841-849
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania korozyjne i mikrobiologiczne w Geotermii Mazowieckiej S.A.
    Corrosion and microbiological study in Geotermia Mazowiecka S.A.
    Autorzy:
    Banaś, J.
    Mazurkiewicz, B
    Stolarski, W.
    Lewandowska, M.
    Ura-Bińczyk, E.
    Kaca, W.
    Żarnowiec, P.
    Balcer, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/203947.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
    Tematy:
    wody geotermalne
    korozja mikrobiologiczna
    monitorowanie korozji
    Geotermia Mazowiecka
    geothermal water
    microbiological corrosion
    corrosion monitoring
    Opis:
    Jednym z ważnych problemów determinujących koszty eksploatacji wód geotermalnych jest korozja rur wydobywczych, instalacji obiegu geotermalnego, armatury oraz kolmatacja otworów zatłaczających. Zjawiska te związane są z korozją mikrobiologiczną w anaerobowym środowisku wody geotermalnej zawierającej CO2. W niniejszym artykule przedstawiono kompleksowe badania korozyjne i mikrobiologiczne w Geotermii Mazowieckiej S.A. Badania mikrobiologiczne wykazały obecnoś bakterii redukujących siarczany (SRB) w osadach ko rozyjnych i mineralnych. Identyfikację bakterii przeprowadzono techniką reakcji amplifikacji PCR fragmentu genu 16S rRNA i stwierdzono występowanie: Desulfovibrio – Desulfomicrobium, Desulfobacter oraz Desulfotomaculum. Obecność tych bakterii jest przyczyną tworzenia warstwy produktów korozji zbudowanej w głównej mierze z amorficznego siarczku żelaza. Woltamperometryczne i impedancyjne pomiary elektrochemiczne pro- wadzone w laboratorium oraz w stacji korozyjnej Geotermii pozwoliły na przedstawienie wpływu obecności bakterii SRB na mechanizm korozji stali węglowej i stali stopowej. Stacja prowadzi monitorowanie i akwizycję danych fizykochemicznych i korozyjnych z możliwością zarządzania z poziomu centrum dyspozycyjnego Geotermii Mazowieckiej S.A.
    One of the important issues that determine the operating costs of a geothermal plant is the corrosion of casing, geothermal installations, fittings and deposit colmatation. These phenomena are connected with microbially induced corrosion in anaerobic environment of geothermal water containing CO2. The paper presents a com- prehensive study of corrosion and microbiological corrosion in the Geotermia Mazowiecka plant. Microbiological investigations showed the presence of sulphate-reducing bacteria (SRB) in mineral and corrosion deposits. Identification of the bacteria was performed by PCR amplification of the 16S rRNA gene and the following bacteria have been identified: Desulfovibrio – Desulfomicrobium, Desulfobacter and Desulfotomaculum. The presence of these bacteria is the cause of the formation of a corrosion products layer containing mainly amorphous iron sulfide. Voltammetric and impedance measurements conducted in the laboratory and in the corrosion station at Geotermia Mazowiecka S.A. allowed the influence of SRB on the corrosion mechanism of carbon and alloyed steel to be studied. The station is able to monitor the corrosion and acquisition of physico-chemical data to managed from the Geotermia Mazowiecka S.A. dispatch centre level.
    Źródło:
    Technika Poszukiwań Geologicznych; 2015, R. 54, nr 1, 1; 59-80
    0304-520X
    Pojawia się w:
    Technika Poszukiwań Geologicznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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