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    Wyświetlanie 1-4 z 4
    Tytuł:
    Method for prediction of cavitation erosion performance in hydro-turbines based on the two-parameter phenomenological model
    Autorzy:
    Gireń, B. G.
    Noińska-Macińska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191846.pdf
    Data publikacji:
    2018
    Wydawca:
    Gdańska Szkoła Wyższa
    Tematy:
    cavitation erosion
    materials performance
    performance evaluation
    random process modelling
    wear
    Opis:
    Two-parameter phenomenological model for quantification of the cavitation damage process in its initial — incubation stage inspired by Förster energy migration theory is presented in the paper. The model built was supplemented with functional relationships between calculation parameters and strength parameters of the materials derived for chosen cavitation loading conditions. Experiments at the rotating disk set-up have been carried out in order to obtain necessary experimental data. The values of calculation parameters have been determined by adjusting the theoretical erosion curve to experimental one. Preliminary experimental verification of the model soundness consisted in comparing theoretical to experimental results obtained from both the ICET program and the experimental investigations of the cavitation erosion at Banki-Michel turbine blades. Reliability as well as the sources of inaccuracy and uncertainties were also discussed. The far-reaching aim of the work is to create the calculation tool for prediction of cavitation erosion performance in hydro-turbines during their operating cycle.
    Źródło:
    Eco-Energetics: technologies, environment, law and economy; 2018, 1; 21--32
    2657-5922
    2657-7674
    Pojawia się w:
    Eco-Energetics: technologies, environment, law and economy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Communication processes, public administration and performance evaluation
    Autorzy:
    Musaraj, Arta
    Powiązania:
    https://bibliotekanauki.pl/articles/1035776.pdf
    Data publikacji:
    2011
    Wydawca:
    Academicus. International Scientific Journal publishing house
    Tematy:
    public administration
    communication process
    service delivery
    performance evaluation
    communications tools
    Opis:
    Albanian efforts to fulfill European standards and norm in its Public Administration and service delivery, are becoming a research argument for academics and practitioners as well. Even if significant efforts have been made in this direction there is still a gap in analyzing the link between the communication process which creates and delivers the public service, effect of the used tools in service provision and delivery, the performance evaluation of this sector and the future of the sector itself affected by the intersection of these factors. This brings a great necessity to watch very close those evolutions, processes and the impacts they have in the Albanian social tissue. At the same time, it is very important to understand what streamline has been followed till now by micro and macro huge progresses which have affected the systems, the relations between pairs which not necessarily are being expressed in standards. There is no sustainable change or improvement, if they aren’t built at the cellular level, and when we talk about the state, institutions and citizens, the way they relate, if it is standardized or not by laws or procedures, it becomes the most important reading that we must do to understand the substratum of those progresses. Relations, communications and the future of the communicative situations between citizens and public operators including the public administration during the public service proceedings, indicate the quality and sustainability of Albanian evolutions in social view, as well as the forecasting we can do regarding their impact in the future. Tools by which strategies have been applied, seems to affect the process as well as affect pairs perception of fairness, justice and low conformity. This oblige us investigate about effects and impacts they have had during the service proceedings. We may judge the transparence’s perception related to how much equal citizens consider they are being treated by public operators, what’s its influence in trust climate, notably on the citizens trust towards public administration, whose salaries are being paid by public and who theoretically must carry over public interest. We may, as well, investigate the impact that this variable has had in the new dimension of accountability which is a strong indicator of the evolution of public administrations in Albania, showing how the way public services are being delivered and how much the public itself is actually ruling through a careful reading of the communications hold between them and public administrations.
    Źródło:
    Academicus International Scientific Journal; 2011, 03; 28-37
    2079-3715
    2309-1088
    Pojawia się w:
    Academicus International Scientific Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development and Performance Evaluation of a Pulverizer for Plantain Flour Process Plant
    Autorzy:
    Olutomilola, Emmanuel Olatunji
    Ayodeji, Sesan Peter
    Adeyeri, Michael Kanisuru
    Fagbemi, Tayo Nathaniel
    Powiązania:
    https://bibliotekanauki.pl/articles/23965544.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    cukrzyca COVID 19
    rozwój pulweryzatora
    ocena wydajności
    zakład przetwarzania mąki
    diabetes COVID-19
    pulverizer development
    performance evaluation
    plantain
    flour process plant
    Opis:
    Diabetes, adjudged a risk factor for coronavirus infectious disease 2019 (COVID-19), can be managed through consumption of plantain and its associated products. Plantain is usually processed into flour and other storable/value-added products due to its very short shelf-life. To process unripe plantain pulps into flour, there is a need for size reduction after drying. This paper presents the development and performance evaluation of a size reduction unit for pulverizing, sieving and conveying material to the next processing stage in a plantain flour process plant. Its model was developed using solidworks application software. After design analysis, the model was simulated to establish its suitability/adequacy for fabrication. The pulverizer was fabricated using locally available materials. Its performance evaluation gave 400kg/h throughput, 96% crushing efficiency and 96% efficiency based on the required particle size. The average particle size of flour obtained was 236μm using 500μm screen. Effect of cyclone control-valve on the pulverizer’s overall efficiency was also investigated by allowing it to operate when the valve was completely closed, partially closed and fully opened. It was observed that the control-valve’s positions significantly influenced the machine’s performance/efficiency. It can thus be inferred that the position of cyclone control-valve has significant effect on a pulverizer’s efficiency/performance. Hence, leaving control-valve fully opened during operation would help a pulverizer perform with optimum efficiency, as the pulverizer was able to convey material, efficiently in that position, to the next processing stage during performance evaluation.
    Źródło:
    Production Engineering Archives; 2021, 27, 3; 223--231
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phenomenological technique for prediction of cavitation erosion performance
    Autorzy:
    Gireń, B. G.
    Welzant, A.
    Baran, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818504.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    cavitation erosion
    material performance
    performance evaluation
    wear
    erosion process modelling
    International Cavitation Erosion Test
    erozja kawitacyjna
    wydajność materiału
    ocena wydajności
    zużycie
    modelowanie procesów erozji
    Międzynarodowy Kawitacyjny Test Erozyjny
    Opis:
    Purpose: Major aim of the work was to formulate 2-parameters models of the cavitation erosion process and to bring about the particular methods for prediction of its performance with due calculation formulas. Design/methodology/approach: Phenomenological model of the erosion supplemented with functional relationships between calculation parameters and the strength parameters stand for the foundations of the method. Having assumed the probabilistic nature of the process and fatigue regime of the material destruction, the volume loss in time has been determined as proportional to the integral of the appropriate probability function. Correlations between parameters have been derived by adjusting the computed erosion curves to the experimental ones for the vast diversity of the cases. Findings: Two different formulas for the volume loss of the material in time under cavitation loading have been derived. Research limitations/implications: Results obtained from both the International Cavitation Erosion Test program as well as the own experiments carried out at the rotating disk set-up supplied necessary experimental data. Preliminary verification of the method soundness was completed. Assumption on the independence of the calculation parameters on the loading conditions have been taken. The approach is valid provided the defined relationships are also independent on the type and amplitude of the loading. Practical implications: Achieving the objectives is expected to result in developing a technique for assessment of the material damage under cavitation loadings. Numerical implementation of the model completed with the derived functional relationships stand for a tool, enabling a prospective user to predict the material performance under defined cavitation loading. Originality/value: New formulas for calculating the efficiency of cavitation erosion, inferred from the models of high physical clarity are the original contribution to the methodology and techniques concerned.
    Źródło:
    Archives of Materials Science and Engineering; 2020, 104, 2; 69--85
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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