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    Wyświetlanie 1-6 z 6
    Tytuł:
    Optimal power flow with transmission cost solution under bilateral and multilateral transactions
    Autorzy:
    Bastin Solai Nazaran, J.
    Selvi, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/141690.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SEOPF
    ESCOPF
    power flow tracing
    severity index
    HGO
    bilateral
    multilateral transactions
    Opis:
    In a deregulated electricity market, it is important to dispatch the generation in an economical manner and to ensure security under different operating conditions. In this study evolutionary computation based solution for optimal power flow is attempted. Social welfare optimization is taken as the objective function, which includes generation cost, transmission cost and consumer benefit function. Transmission cost is calculated using Bialek’s power flow tracing method. Severity index is applied as a constraint to measure the security. The objective function is calculated for pre and post contingency periods. Real power generations, real power loads and transformer tap settings are selected as control variables. Different bilateral and multilateral conditions are considered for analysis. A Human Group Optimization algorithm is used to find the solution of the problem. The IEEE 30 bus system is taken as a test system.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 2; 227-245
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PSO based optimal location and sizing of SVC for novel multiobjective voltage stability analysis during N – 2 line contingency
    Autorzy:
    Mangaiyarkarasi, S. P
    Sree Renga Raja, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/140430.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    N – 2 contingency analysis
    voltage severity
    particle swarm optimization (PSO)
    SVC
    power system planning
    Opis:
    In this paper voltage stability is analysed based not only on the voltage deviations from the nominal values but also on the number of limit violating buses and severity of voltage limit violations. The expression of the actual state of the system as a numerical index like severity, aids the system operator in taking better security related decisions at control centres both during a period of contingency and also at a highly stressed operating condition. In contrary to conventional N – 1 contingency analysis, Northern Electric Reliability Council (NERC) recommends N – 2 line contingency analysis. The decision of the system operator to overcome the present contingency state of the system must blend harmoniously with the stability of the system. Hence the work presents a novel N – 2 contingency analysis based on the continuous severity function of the system. The study is performed on 4005 possible combinations of N – 2 contingency states for the practical Indian Utility 62 bus system. Static VAr Compensator is used to improve voltage profile during line contingencies. A multi- objective optimization with the objective of minimizing the voltage deviation and also the number of limit violating bus with optimal location and optimal sizing of SVC is achieved by Particle Swarm Optimization algorithm.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 4; 535-550
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Condition monitoring of induction motor bearing based on bearing damage index
    Autorzy:
    Patel, R. K.
    Giri, V. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/140535.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bearing damage index (BDI)
    inner raceway fault (IRF)
    outer raceway fault (ORF)
    fault severity
    vibration signal
    Opis:
    The rolling element bearings are used broadly in many machinery applications. It is used to support the load and preserve the clearance between stationary and rotating machinery elements. Unfortunately, rolling element bearings are exceedingly prone to premature failures. Vibration signal analysis has been widely used in the faults detection of rotating machinery and can be broadly classified as being a stationary or non-stationary signal. In the case of the faulty rolling element bearing the vibration signal is not strictly phase locked to the rotational speed of the shaft and become “transient” in nature. The purpose of this paper is to briefly discuss the identification of an Inner Raceway Fault (IRF) and an Outer Raceway Fault (ORF) with the different fault severity levels. The conventional statistical analysis was only able to detect the existence of a fault but unable to discriminate between IRF and ORF. In the present work, a detection technique named as bearing damage index (BDI) has been proposed. The proposed BDI technique uses wavelet packet node energy coefficient analysis method. The well-known combination of Hilbert transform (HT) and Fast Fourier Transform (FFT) has been carried out in order to identify the IRF and ORF faults. The results show that wavelet packet node energy coefficients are not only sensitive to detect the faults in bearing but at the same time they are able to detect the severity level of the fault. The proposed bearing damage index method for fault identification may be considered as an ‘index’ representing the health condition of rotating machines.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 1; 105-119
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The evaluation of canine atopic dermatitis extent and severity index (CADESI) test in dogs with atopic dermatitis (AD) treated with cyclosporine or prednisone
    Autorzy:
    Taszkun, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/32356.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    canine atopic dermatitis extent and severity index test
    dog
    atopic dermatitis
    dermatitis
    treatment
    prednisone
    cyclosporin
    animal disease
    Opis:
    The purpose of this study was to assess the clinical state of dogs with atopic dermatitis (AD) by use of CADESI test in own modification during the first visit in the Dermatology Consult Room as well as during the treatment. The study was performed in two groups (I-E and II-C) of 20 dogs in each group. In dogs which were qualified to the I-E group, as antiallergic, anti-inflammatory and antipruritic treatment, prednisone (oral preparation Encorton – Polfa Pabianice) at dose 0.5 mg/kg b.w./day was administered, while in dogs qualified to the II-C group – cyclosporine (oral preparation Sandimmun Neoral – Novartis Pharma) at a dose of 5 mg/kg b.w./day; the treatment was continued for 6 weeks in both groups. During the study, skin lesions were assessed in 15 specified body areas using 4 parameters and 5-point scale. In group I-E and II-C the amount of received points in CADESI test was decreased by 82.26% and by 83% respectively, after the treatment. Statistical analyses of the results obtained revealed no statistically significant (P=0.05) differences between means of I-E and II-C groups in consecutive examinations, which indicates comparable clinical efficacy of both drugs. Statistically significant differences (P=0.05) of the parameters assessed were found after secondary dermatoses treatment, and after every two weeks of antipruritic and anti-inflammatory treatment.
    Źródło:
    Polish Journal of Veterinary Sciences; 2010, 13, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analysis of influential factors associated with rural crashes in a developing country: a case study of Iran
    Autorzy:
    Sheykhfard, Abbas
    Haghighi, Farshidreza
    Abbasalipoor, Reza
    Powiązania:
    https://bibliotekanauki.pl/articles/2173931.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rural roads
    severity of crashes
    crashes
    injury-fatal crashes
    logit model
    crash data collected
    drogi wiejskie
    ciężkość wypadków
    awarie
    wypadki śmiertelne
    model logiczny
    Opis:
    Road traffic deaths continue to rise, reaching 1.35 million in recent years. Road traffic injuries are the eighth leading cause of death for people of all ages. Note that there is a wide difference in the crash rate between developed and developing countries and that developed countries report much lower crash rates than developing and underdeveloped countries. World Health Organization reports that over 80% of fatal road crashes occur in developing countries, while developed countries account for about 7% of the total. The rate of road crashes in developing countries is higher than the global average, despite some measures reducing deaths over the last decade. Numerous studies have been carried out on the safety of urban roads. However, comprehensive research evaluating influential factors associated with rural crashes in developing countries is still neglected. Therefore, it is crucial to understand how factors influence the severity of rural road crashes. In the present study, rural roads in Mazandaran province were considered a case study. The Crash data collected from the Iranian Legal Medicine Organization covers 2018 to 2021, including 2047 rural crashes. Dependent variables were classified as damage crashes and injury-fatal crashes. Besides, independent variables such as driver specifications, crash specifications, environment specifications, traffic specifications, and geometrical road specifications were considered parameters. The logit model data indicate that factors associated with driver and crash specifications influence rural crashes. The type of crashes is the most critical factor influencing the severity of crashes, on which the fatal rate depends. The findings suggested that implementing solutions that minimize the effect of the factors associated with injury and death on rural roads can reduce the severity of crashes on rural roads that share the same safety issues as the case study. Further studies can also be conducted on the safety and mechanics of the vehicle by focusing the research on the types of vehicles and the sources of the damage.
    Źródło:
    Archives of Transport; 2022, 63, 3; 53--65
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of Alternaria blight [Alternaria spp.] spread on spring oilseed rape leaves and siliques and variation of the disease parameters under the effect of prochloraz and tebuconazole in relation to application time
    Dynamika rozprzestrzeniania i zmiennosc parametrow czerni krzyzowych na lisciach i luszczynach rzepaku jarego pod wplywem prochlorazu i tebukonazolu w zaleznosci od terminu ich uzycia
    Autorzy:
    Brazauskiene, I
    Petraitiene, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/66482.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spread dynamics
    blight
    Alternaria
    spring oilseed rape
    oilseed rape
    leaf
    silique
    variation
    plant disease
    disease parameter
    prochloraz
    tebuconazole fungicide
    fungicide
    application time
    disease severity
    Źródło:
    Journal of Plant Protection Research; 2003, 43, 4; 313-324
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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