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    Wyświetlanie 1-7 z 7
    Tytuł:
    Influence of electric power generation structure on frequency control — mathematical modelling
    Wpływ struktury wytwarzania energii elektrycznej na regulację automatyczną częstotliwości — modelowanie matematyczne
    Autorzy:
    Domachowski, Z.
    Ghaemi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/172835.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pakiet 3x20
    energia elektryczna
    wytwarzanie energii elektrycznej
    "3x20" package
    electricity
    electric power generation
    Opis:
    A 20% decrease in CO2 emission is the principal goal formulated by European Union in the "3x20" package. As a result, development of windfarms, nuclear power plants and even small heat and power generating plants are expected in Poland. Electric power generation in windfarms and in nuclear power plants involves specific problems in the electric grid frequency control. Windfarm power generation requires a support from conventional power plants, when a nuclear power plant requires adequate structure for the control and adjustment purposes. A concept of mathematical model of so-called multi-machine power system, based on representative power plant mathematical models, has been presented in this paper. Such a model of electric grid is suggested for primary and secondary frequency control simulations, as well. The purpose is to investigate the influence of power generation structure on power system frequency control.
    Podstawowym celem pakietu „3x20" Unii Europejskiej jest zmniejszenie o 20% emisji dwutlenku węgla. Z tego powodu oczekuje się w Polsce rozwoju energetyki wiatrowej, podobnie jak energetyki jądrowej, a także mini elektrociepłowni. Elektrownie wiatrowe i jądrowe wnoszą specyficzne problemy w regulacji automatycznej częstotliwości systemu elektroenergetycznego. Farmy wiatrowe wymagają pod tym względem wspomagania przez elektrownie konwencjonalne; bloki jądrowe wymagają odpowiedniego dostosowania struktury i nastawień ich układów regulacji automatycznej. Przedstawiono koncepcję wielomaszynowego modelu matematycznego systemu elektroenergetycznego, opartą na modelach matematycznych tzw. reprezentatywnych turbozespołów i bloków. Taki uproszczony model matematyczny jest proponowany do symulacyjnych badań porównawczych regulacji automatycznej częstotliwości systemu elektroenergetycznego. Ich celem jest analiza wpływu struktury wytwarzania energii elektrycznej na regulację automatyczną częstotliwości systemu elektroenergetycznego.
    Źródło:
    Archiwum Energetyki; 2011, 41, 3-4; 3-14
    0066-684X
    Pojawia się w:
    Archiwum Energetyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Total ship operability –review, concept and criteria
    Autorzy:
    Ghaemi, M. H.
    Olszewski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/259127.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship operability
    operability limitation criteria
    safe operation level
    Opis:
    The ship operability can be understood and analysed in different manners, and its quality is described using different indexes by different authors. Practically, there is no general and widely accepted description of total ship operability in the literature, nor in the rules of classification societies, which would include both seakeeping and manoeuvrability characteristics of a ship, and simultaneously take into account all ship subsystems and, what is most important, comfort and safety of people on board. The aim of this paper is to propose a general definition of total ship operability and name, adjust, describe and justify criteria which should be considered in the ship operability analysis, as well as to provide a relevant algorithm paving the road for further investigation on total ship operability determination.
    Źródło:
    Polish Maritime Research; 2017, S 1; 74-81
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analysis of overall ship fuel consumption in acceleration manoeuvre using hull-propeller-engine interaction principles and governor features
    Autorzy:
    Zeraatgar, Hamid
    Ghaemi, M. Hossein
    Powiązania:
    https://bibliotekanauki.pl/articles/258468.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    modelling and simulation
    fuel consumption
    hull-propeller-engine interactions
    ship propulsion system
    governor
    control strategy
    Opis:
    The problem of reduction of greenhouse gas emissions in shipping is currently addressed by many research works and related industries. There are many existing and visionary technologies and ideas, which are conceptually defined or practically realised. This goal can be achieved in different ways, and reducing fuel consumption is one of the major methods. In these circumstances, the aim of this study is to analyse the possibility of fuel consumption reduction by using an alternative control strategy for low-speed marine diesel engines which would take into account the interactions between hull, propeller and main engine. For this purpose, a mathematical model including ship hull and propulsion system is developed. A case study is conducted for a ship for which the results of both the ship hull and screw propeller model tests are available. A low-speed two-stroke diesel engine is then selected for the considered ship. Two different governors are included in the model and their parameters are changed to investigate the dynamic behaviour of the system when simulating the forward acceleration mode in calm sea conditions. The research is mainly focused on variations of fuel consumption by the ship passing a certain distance to reach the nominal constant speed. It is concluded that, for a given travel distance, it is possible to save considerable amount of fuel at the expense of slight increase of journey time.
    Źródło:
    Polish Maritime Research; 2019, 1; 162-163
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using satellite data for soil cation exchange capacity studies
    Autorzy:
    Ghaemi, M.
    Astaraei, A.R.
    Sanaeinejad, S.H.
    Zare, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/24146.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    This study was planned to examine the use of LandSat ETM+ images to develop a model for monitoring spatial variability of soil cation exchange capacity in a semi-arid area of Neyshaboor. 300 field data were collected from specific GPS registered points, 277 of which were error free, to be analysed in the soil laboratory.The statistical analysis showed that therewas a small R-Squared value, 0.17, when we used the whole data set. Visual interpretation of the graphs showed a trend among some of the data in the data set. Forty points were filtered based on the trends, and the statistical analysis was repeated for those data. It was discovered that the 40 series were more or less in the same environmental conditions; most of them were located in disturbed soils or abandoned lands with sparse vegetation cover. The soil was classified into high and medium salinity, with variable carbon (1.0 to 1.6%), heavy textured and with high silt and clay. Finally it was concluded that two different models could be fitted in the data based on their spatial dependency. The current models are able to explain spatial variability in almost 45 to 65% of the cases.
    Źródło:
    International Agrophysics; 2013, 27, 4
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatio-temporal soil quality assessment under crop rotation irrigated with treated urban wastewater using fuzzy modelling
    Autorzy:
    Ghaemi, M.
    Astaraei, A.R.
    Mahalati, M.N.
    Emami, H.
    Sanaeinejad, H.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/24657.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    spatio-temporal property
    soil quality
    assessment
    crop rotation
    irrigation
    urban waste water
    fuzzy model
    fuzzy function
    treated waste water
    Opis:
    Quantifying soil quality is important for asses- sing soil management practices effects on spatial and temporal variability of soil quality at the field scale. We studied the pos- sibility of defining a simple and practical fuzzy soil quality index based on biological, chemical and physical indicators for assessing quality variations of soil irrigated with well water and treated urban wastewater during two experimental years. In this study 6 proper- ties considered as minimum data set were selected out of 18 soil properties as total data set using the principal component analysis. Treated urban wastewater use had greater impact on biological and chemical quality. The results showed that the studied minimum data set could be a suitable representative of total data set. Significant correlation between the fuzzy soil quality index and crop yield (R 2 = 0.72) indicated the index had high biological significance for studied area. Fuzzy soil quality index approach (R 2 = 0.99) could be effectively utilized as a tool leading to better understanding soil quality changes. This is a first trial of creation of a universal index of soil quality undertaken.
    Źródło:
    International Agrophysics; 2014, 28, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining the structural amino acid attributes which are important in both protein thermostability and alkalophilicity: a case study on xylanase
    Autorzy:
    Delavari, A.
    Zare, S.
    Ghaemi, M.R.
    Kashfi, R.
    Ebrahimi, M.
    Tahmasebi, A.
    Ebrahimie, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/80216.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    amino acid
    xylanase
    hemicellulose
    thermostability
    linear regression
    bioinformatics
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2014, 95, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Salt and precipitating agent effect on the specific surface area and compressive strength of alumina catalyst support
    Autorzy:
    Mahmoudian, M.
    Hemmati, A.
    Hashemabadi, H.
    Ghaemi, A.
    Shahhosseini, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/778022.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Alumina
    Catalyst Support
    Sol Gel
    Specific Surface Area
    compressive strength
    Opis:
    Nowadays, catalyst supports are extensively used to decrease the costs and increase the contact surface area in chemical reactions. Specific surface area, compressive strength, pore volume and pore size are some of the most important characteristics of a catalyst support. In this work, Sol-gel and peptization methods were applied to produce alumina catalyst support. Also the roles of aluminum salts and precipitating agents on the specific surface area and compressive strength of alumina catalyst support were investigated. In addition, various additives and common methods in the increasing surface area, compressive strength and adjusting the porosity and pore size are used in this study. The results show that using caustic soda as precipitating agent and aluminum chloride salt yields catalyst supports with the best compressive strength. Also, using aluminum nitrate and ammonia as precipitating agent produced alumina catalyst support with the highest specific surface area.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 3; 35-40
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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