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    Wyświetlanie 1-7 z 7
    Tytuł:
    Metaheuristic approach to optimal power flow using mixed integer distributed ant colony optimization
    Autorzy:
    Suresh, Vishnu
    Janik, Przemyslaw
    Jasinski, Michal
    Powiązania:
    https://bibliotekanauki.pl/articles/141692.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ant colony optimization
    IEEE 30 bus
    IEEE 57 bus
    metaheuristic algorithm
    mixed integer distributed ant colony optimization
    optimal power flow
    Opis:
    This paper presents the application of an improved ant colony optimization algorithm called mixed integer distributed ant colony optimization to optimize the power flow solution in power grids. The results provided indicate an improvement in the reduction of operational costs in comparison with other optimization algorithms used in optimal power flow studies. The application was realized to optimize power flow in the IEEE 30 and the IEEE 57 bus test cases with the objective of operational cost minimization. The optimal power flow problem described is a non-linear, non-convex, complex and heavily constrained problem.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 2; 335-348
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Construction of a bicistronic proangiogenic expression vector and its application in experimental angiogenesis in vivo.
    Autorzy:
    Małecki;, Maciej
    Przybyszewska, Małgorzata
    Janik, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/1043468.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    angiogenesis
    gene therapy
    bicistronic vectors
    Opis:
    Manipulation of angiogenesis in vivo is an example of successful gene therapy strategies. Overexpression of angiogenic genes like VEGF, FGF or PDGF causes new vessel formation and improves the clinical state of patients. Gene therapy is a very promising procedure but requires large amounts of pharmaceutical-grade plasmid DNA. In this regard we have constructed a bicistronic plasmid DNA vector encoding two proangiogenic factors, VEGF165 and FGF-2. The construct (pVIF) contains the internal ribosome entry site (IRES) of the encephalomyocarditis virus (ECMV) which permits both genes to be translated from a single bicistronic mRNA. The IRES sequence allows for a high efficiency of gene expression in vivo. The pVIF vector was characterized in vitro and in vivo. In vivo angiogenesis studies showed that the bicistronic vector encoding two proangiogenic factors induces the formation of new vessels significantly more than pVEGF165 or pFGF-2 alone. In our opinion the combined proangiogenic approach with VEGF165 and FGF-2 is more powerful and efficient than single gene therapy. We also postulate that IRES sequence can serve as a useful device improving efficiency of gene therapy.
    Źródło:
    Acta Biochimica Polonica; 2003, 50, 3; 875-882
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Signal transduction in confluent C3H 10T1/2 cells. The role of focal adhesion kinase.
    Autorzy:
    Miłoszewska, Joanna
    Trembacz, Halina
    Janik, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/1044183.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    integrins
    FAK
    ERK
    fibronectin
    contact inhibition
    Opis:
    The activities of extracellular signal-regulated kinases (ERK1/ERK2) is required for proliferation of several types of cells. The performed analysis showed stimulation of ERK's by fetal calf serum (FCS) or fibronectin in the C3H 10T1/2 cell cultures at logarithmic phase of growth. The ERKs activity was not stimulated in confluent cells. This could not be accounted for a partial down regulation of ERK since its level was stable in both types of cells regardless of their density and kind of stimulation. Searching for ERK upstream elements we studied the integrin receptor gene transcript by RT-PCR and focal adhesion kinase (FAK) by Western blotting and phosphorylation assays. It was found that FCS and fibronectin stimulated phosphorylating activity of FAK in the cells at the logarithmic phase of growth, but were inefficient in the confluent cells. RT-PCR showed the presence of α5 and β1 integrin transcripts, and p125FAK was at the same level regardless of the type of stimulation. These data indicate that the ability of FAK to be activated plays an important role in ERK regulation and, in consequence in proliferation and growth inhibition during confluence.
    Źródło:
    Acta Biochimica Polonica; 2001, 48, 1; 175-181
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charging and Discharging Strategies for Clustered Regional Energy Storage System
    Autorzy:
    Li, Yang
    Janik, Przemysław
    Pfeiffer, Klaus
    Schwarz, Harald
    Powiązania:
    https://bibliotekanauki.pl/articles/2175940.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    charging strategy
    discharging strategy
    energy storage system
    energy-to-power ratio
    fuzzy logic control
    Opis:
    With the massive expansion of decentralised renewable energy in electricity grid networks, the power supply system has been changed from centralised to decentralised one and from directional to bi-directional one. However, due to the regional energy structure difference in the power imbalance between electricity generation and consumption is becoming more and more serious. A grid-scale energy storage system (ESS) can be one solution to balance the local difference. In this paper, two charging/discharging strategies for the grid-scale ESS were proposed to decide when and with how much power to charge/discharge the ESS. In order to realise the two strategies, this paper focuses on the application of fuzzy logic control system. The proposed strategies aim to reduce the peak power generation, consumption and the grid fluctuation. In particular, this paper analysis the ratio between energy-capacity and rated power of ESS. The performance of the proposed strategies is evaluated from two aspects, the normalised power of ESS itself and the influence on the power grid. Simulation studies were carried out on the rule-based control systems with different energy-to-power (e2p) ratios, and the results show that the proposed charging strategy with combination of extreme situation of power imbalance and the rest capacity of ESS provides a smooth load curve for the regional power grid system while the external power exchange is reduced effectively.
    Źródło:
    Power Electronics and Drives; 2022, 7, 42; 56--67
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Smart control of energy storage system in residential photovoltaic systems for economic and technical efficiency
    Autorzy:
    Kaczorowska, Dominika
    Rezmer, Jacek
    Janik, Przemysław
    Sikorski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2202548.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    economic efficiency
    energy storage system ESS
    microgrid management
    optimal power flow
    OPF
    particle swarm optimisation PSO
    Opis:
    In recent years, due to the increasing number of renewable energy sources, which are characterised by the stochastic nature of the generated power, interest in energy storage has increased. Commercial installations use simple deterministic methods with low economic efficiency. Hence, there is a need for intelligent algorithms that combine technical and economic aspects. Methods based on computational intelligence (CI) could be a solution. The paper presents an algorithm for optimising power flow in microgrids by using computational intelligence methods. This approach ensures technical and economic efficiency by combining multiple aspects in a single objective function with minimal numerical complexity. It is scalable to any industrial or residential microgrid system. The method uses load and generation forecasts at any time horizon and resolution and the actual specifications of the energy storage systems, ensuring that technological constraints are maintained. The paper presents selected calculation results for a typical residential microgrid supplied with a photovoltaic system. The results of the proposed algorithm are compared with the outcomes provided by a deterministic management system. The computational intelligence method allows the objective function to be adjusted to find the optimal balance of economic and technical effects. Initially, the authors tested the invented algorithm for technical effects, minimising the power exchanged with the distribution system. The application of the algorithm resulted in financial losses, €12.78 for the deterministic algorithm and €8.68 for the algorithm using computational intelligence. Thus, in the next step, a control favouring economic goals was checked using the CI algorithm. The case where charging the storage system from the grid was disabled resulted in a financial benefit of €10.02, whereas when the storage system was allowed to charge from the grid, €437.69. Despite the financial benefits, the application of the algorithm resulted in up to 1560 discharge cycles. Thus, a new unconventional case was considered in which technical and economic objectives were combined, leading to an optimum benefit of €255.17 with 560 discharge cycles per year. Further research of the algorithm will focus on the development of a fitness function coupled to the power system model.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 1; 81--102
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proposal of a regional grid cluster model for analysis of electrical power network performance
    Autorzy:
    Li, Yang
    Janik, Przemysław
    Schwartz, Harald
    Pfeiffer, Klaus
    Powiązania:
    https://bibliotekanauki.pl/articles/2135739.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    decentralized generation
    grid cluster
    power balance
    regional power grid
    Opis:
    This paper provides a method for simplified description of a regional power grid model aimed to deliver a grid reduction, and improve grid performance observability. The derived power grid model can be used to analyze the regional allocation of the decentralized energy generation and consumption. The expansion of wind and solar generation in the power system affects the residual load. The power balance between electricity consumption and generation was calculated and analyzed based on the temporal and spatial scales. The proposed grid clustering method is a useful approach for performance analysis in systems with a growing share of renewable generation.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 3; 601--613
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie betonów o podwyższonych parametrach szczelności ze skłonnością do samoregeneracji na przykładzie realizacji budowy garażu wielopoziomowego w Kielcach
    Autorzy:
    Janik, Ireneusz
    Jasiak, Aneta
    Grabarczyk, Przemysław
    Pakłos, Dawid
    Witkowski, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/1397074.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Producentów Cementu
    Tematy:
    technologia
    SIKA Watertight Concrete
    garaż wielopoziomowy
    garaż prefabrykowany
    beton samonaprawialny
    beton szczelny
    domieszka uszczelniająca
    mieszanka betonowa
    badanie trwałości
    technology
    multi-storey garage
    prefabricated garage
    self-healing concrete
    watertight concrete
    waterproofing admixture
    concrete mix
    durability test
    Opis:
    Na przestrzeni ostatnich lat parkowanie samochodów, w szczególności w wielkich miastach, stało się jednym z najważniejszych problemów urbanistycznych. Problem staje się coraz bardziej zauważalny, dlatego wymaga to prowadzenia racjonalnej polityki, spójnej z polityką komunikacyjną i inwestycyjną miast. Analizy wykazują, iż obecnie niezbędne jest wybudowanie na poziomie około 3 mln miejsc parkingowych. Znaczną część tych miejsc można uzyskać w zakresie realizacji garaży wielopoziomowych nadziemnych, generujących tym samym niskie koszty utrzymania oraz zmniejszających zapotrzebowanie na teren pod parkingi. Autorzy referatu prezentują doświadczenia praktyczne z realizacji 5-kondygnacyjnego parkingu przy zastosowaniu zespolonych prefabrykatów wykonanych z betonu o podwyższonych parametrach trwałościowych z innowacyjną warstwą żywiczną, dzięki którym objętość konstrukcji uległa redukcji, obniżono tym samym koszt realizacji inwestycji oraz zredukowano energochłonność produkcji i wskaźnik emisji CO2.
    Car parking in recent years; in large cities in particular it has become one of the most important urban problems. The problem is becoming more and more noticeable, which is why it requires rational policy consistent with the communication and investment policy of cities. Analyzes show that it is currently necessary to build around 3 million parking spaces. A significant part of these places can be obtained in the implementation of above-ground multi-level garages, thus generating low maintenance costs and reducing the demand for parking lots. The authors of the paper present practical experience from the implementation of a 5-storey car park using composite recast concrete elements made of concrete with increased durability parameters with an innovative resin layer, thanks to which the volume of the structure has been reduced, thereby reducing the cost of investment, and reducing the energy consumption of production and CO2 emission index.
    Źródło:
    Budownictwo, Technologie, Architektura; 2020, 4; 62-65
    1644-745X
    Pojawia się w:
    Budownictwo, Technologie, Architektura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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