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    Wyświetlanie 1-7 z 7
    Tytuł:
    Solar photovoltaic interconnected ZSI-unified power quality conditioner to enhance power
    Autorzy:
    Raja, A.
    Vijayakumar, M.
    Karthikeyan, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2173533.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Z-source inverter
    photovoltaic
    power quality
    unified power quality conditioner
    UPQC
    total harmonic distortion
    falownik typu Z
    fotowoltaika
    jakość energii
    zunifikowany kondycjoner jakości energii
    współczynnik zawartości harmonicznych
    Opis:
    In order to ensure that all the connected Equipment in the distribution network operates smoothly, the voltage stability of photovoltaic (PV) integrated distribution systems is very important. Sustaining the voltage profile when integrating PV is a particularly difficult issue. The primary goal of this article is to provide a consistent voltage profile to a sensitive load. A three-phase PV integrated distribution system has been chosen for investigation. An innovative feature of this system is that UPQC DVR and STATCOM systems are powered by Z-source inverters instead of traditional inverters. The ability to actively decouple power is the primary benefit of utilizing a Z-source inverter. The objective of the study effort is to use this new UPQC to synchronize a solar PV system with the distribution system. For the UPQC with battery energy storage system (BESS), the research study examines and develops the most appropriate control approach. A UPQC is a device that is used to integrate solar panels and improve the voltage stability of the distribution system. The prototype model is being developed, and the experimental findings confirm the main objective.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 1; e140015, 1--10
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An optimized design for non-zero dispersion shifted fiber with reduced nonlinear effects for future optical networks
    Autorzy:
    Raja, A S
    Selvendran, S
    Priya, R
    Mahendran, C
    Powiązania:
    https://bibliotekanauki.pl/articles/173400.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    dense wavelength division multiplexing
    non-zero dispersion shifted fiber
    refractive index profile
    effective area
    dispersion slope
    Opis:
    Accommodation of many channels in dense wavelength division multiplexing networks raises the average power density of the optical networks. This results in severe nonlinear effects in the optical networks. An optimized design of non-zero dispersion shifted fiber with an enormous effective area can overcome this nonlinear effect and also offer a minimum bending loss and splice loss for a dense wavelength division multiplexing system. In this paper, the alpha-peak profile is utilized for calculating electrical field distribution and designing the refractive index profile of the non-zero dispersion shifted fiber. This fiber has a high effective area of about 120 μm2. Conjointly, the accomplished fiber has a very low bending loss of 1.40×10–14 dB/km and reduced splice loss of 4.46×10–3 dB. Due to this high effective area, the dense wavelength division multiplexing network performance is upgraded by diminishing nonlinear effects. In addition, the newly designed fiber has also a very low dispersion slope (0.057 ps/nm2km). Thus, the proposed fiber is optimized to handle high bandwidth and multiple high bit-rate wavelength channels without nonlinear impairments in the 1.55 μm window long-haul dense wavelength division multiplexing systems.
    Źródło:
    Optica Applicata; 2014, 44, 4; 503-519
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new ratio estimator: an alternative to regression estimator in survey sampling using auxiliary information
    Autorzy:
    Subzar, Mir
    Maqbool, S.
    Raja, T. A.
    Sharma, Prayas
    Powiązania:
    https://bibliotekanauki.pl/articles/1186907.pdf
    Data publikacji:
    2019-12-10
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    simple random sampling
    Opis:
    The most dominant problem in the survey sampling is to obtain the better ratio estimators for the estimation of population mean or population variance. Estimation theory is enhanced by using the auxiliary information in order to improve on designs, precision and efficiency of estimators. A modified class of ratio estimator is suggested in this paper to estimate the population mean. Expressions for the bias and the mean square error of the proposed estimators are obtained. Both analytical and numerical comparison has shown the suggested estimator to be more efficient than some existing ones. The bias of the suggested estimator is also found to be negligible for the population under consideration, indicating that the estimator is as good the regression estimator and better than the other estimators under consideration.
    Źródło:
    Statistics in Transition new series; 2019, 20, 4; 181-189
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Atmospheric Pressure Oxygen Plasma treatment on Bonding Characteristics of Basalt Fibre Reinforced Concrete
    Wpływ obróbki plazmą pod ciśnieniem atmosferycznym na właściwości wiązania betonu zbrojonego włóknem bazaltowym
    Autorzy:
    Nandagopal, K. R.
    Selvakumar, A.
    Raja, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1857666.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    basalt fibre
    plasma treatment
    pullout strength
    debonding energy
    włókno bazaltowe
    obróbka plazmowa
    siła wyrywająca
    energia odklejania
    Opis:
    In this research work, the bonding characteristics of plasma treated basalt fibres were analysed by employing the fibre pull-out test. 80 samples were prepared with two different spans of basalt fibres (such as 25 mm and 50 mm) and four levels of embedded length (10, 15, 20 and 25) inside standard M20 grade concrete. Debonding and bonding characteristics of the plasma treated fibres were compared with raw basalt fibres through the fibre pull-out test. The plasma treated and raw basalt fibres were characterised through Field emission scanning electron microscope (FESEM) and Fourier transform infrared (FTIR) analysis. It was observed that confirmation of the presence of hydroxyl groups on the basalt fibre surface was realised through the FTIR test and that there was higher adsorption of concrete particles by the plasma treated basalt fibres through FESEM. The de bonding and fibre pull-out energy of the plasma treated basalt fibres were improved by about 9% and 10% compared with 25 mm and 50 mm raw basalt fibres. From the observation above, it can be stated that the Surface modification of basalt fibre may lead to a change in the debonding and pull-out energy level.
    W pracy zostały przeanalizowane właściwości wiązania włókien bazaltowych poddanych obróbce plazmowej. Przygotowano 80 próbek dwóch różnych rodzajów włókien bazaltowych: 25 mm i 50 mm z czterema poziomami zatopionej długości (10, 15, 20 i 25) wewnątrz standardowego betonu klasy M20. Charakterystyki odklejania i wiązania włókien poddanych obróbce plazmowej porównano z surowymi włóknami bazaltowymi w teście wyciągania włókien. Obrobione plazmowo i surowe włókna bazaltowe scharakteryzowano za pomocą skaningowego mikroskopu elektronowego z emisją polową (FESEM) i analizy w podczerwieni z transformacją Fouriera (FTIR). Potwierdzenie obecności grup hydroksylowych na powierzchni włókna bazaltowego uzyskano za pomocą testu FTIR. Na podstawie wyników analizy FESEM stwierdzono, że nastąpiła większa adsorpcja cząstek betonu przez poddane obróbce plazmowej włókna bazaltowe. Rozwarstwianie i energia wyciągania włókien bazaltowych poddanych obróbce plazmowej uległy poprawie o około 9% i 10% w porównaniu z surowymi włóknami bazaltowymi 25 mm i 50 mm. Na podstawie przeprowadzonej obserwacji stwierdzono, że modyfikacja powierzchni włókna bazaltowego może prowadzić do zmiany poziomu energii odklejania i wyciągania.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2021, 4 (148); 90-93
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and characterization of AA5083 and AA2024 reinforced with SiO2 particles
    Autorzy:
    Raja, R.
    Jannet, S.
    Thampy, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200119.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    in situ reaction
    SEM
    wear rate
    stir casting
    tensile strength
    EDX
    reakcja in situ
    szybkość zużywania
    wytrzymałość na rozciąganie
    Opis:
    Among the types of different particulates, silica is a standout as one of the the cheapest and low-density particulates accessible in substantial amounts. The present study has been centered around the synthesis and study of aluminum matrix composite strengthened with nano-sized SiO2  particles of various weight percentage by means of the stir casting technique. The EDX emphasized the presence of various elements and augmented the in situ reaction. The tensile strength and wear studies were also carried out. The reinforcement materials percentage variation was one of the important factors for the present studies. The Aluminum Alloy 5083 and 2024, which are magnesium and copper-based alloys, had a significant effect on the material characterization.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 2; 127-132
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hypolipidemic action of rutin on triton WR-1339-induced hyperlipidemia in rats
    Autorzy:
    Livingston Raja, N.R.
    Nair, A.R.
    Senthilpandian, S.
    Ravi, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2098294.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    rutin
    flavonoids
    triglyceride
    atorvastatin
    Triton WR-1339
    hyperlipidemia
    cholesterol
    rat
    Opis:
    Introduction and objective. Hyperlipidemia is considered as a serious communal problem in developed countries, caused by an excess level of cholesterol in blood circulation. It leads to chronic illness and even death in human beings. As the currently available drugs cause unexpected side-effect, the aim of this study is to concentrate on naturally occurring flavonoids which can potentially provide defensive and therapeutic effects in atherosclerosis diseases, and investigate the hypolipidemic effect of rutin on Triton WR-1339 triggered hyperlipidemia in a rat blood sample. Materials and method. Rats were randomly prearranged into five different groups of five rats each. Group-I was the non-disease control and administered normal saline. Group-II was the atherogenic control, administered Triton WR 1339 (200 mg/kg BW). Group-III was standard and received Atorvastatin. The last two groups (IV, V) were tested (I&II) by administering administered Rutin (40 mg/kg, 80 mg/kg) orally. The test material (I&II) and the standard drug were administered for seven days. After the last dose, blood samples were collected and the lipid levels estimated in the blood samples. Results. Rats treated with rutin flavonoid at a dose of 40 mg/kg & 80mg/kg exhibited a reduction in Total Cholesterol, Triglycerides, Low Density Lipoprotein (LDL) and Very Low Density Lipoprotein (VLDL). Rutin also increases the High Density Lipoprotein (HDL), compared with control rats. Rutin treated rats exhibited dose-dependent hypolipidemic activity. The protection percentage of rutin against hyperlipidemia was observed as 41.89%, 55.57% whereas the atorvastatin treated group protection was observed at 60.63%. Conclusions. The results of the study revealed that rutin showed a significant hypolipidemic effectiveness on Triton WR- 1339 induced hyperlipidemia in rats.
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2021, 15, 2; 51-55
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation on surface roughness and kerf analysis in abrasive water jet machining of silicon carbide
    Autorzy:
    Hynes, N.R.J.
    Asirvatham, A.D.
    Sankaranarayanan, R.
    Raja, S.
    Benita, B.
    Atchaya, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200627.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    ceramic
    cutting
    abrasive water jet machining
    ceramika
    cięcie
    cięcie strumieniem wodno-ściernym
    Opis:
    Purpose: Machining silicon carbide (SiC) is challenging due to its brittle and maximum tensile nature. Lapping or laser beam are done with a high cost of manufacturing and low material removal rates. Water abrasive jet cutting is a promising candidate since the machining temperatures and processing force of ceramics are extremely low. Investigation into the abrasive water jet machining of silicon carbide is carried out in the present work. Design/methodology/approach: The variations in traverse speed while abrasive water jet cutting of silicon carbide and its effect on the surface roughness and kerf characteristics are studied. Silicon Carbide abrasive material is used as garnet consisting of 80 mesh. The surface roughness was calculated along with the depth of the cut made during the processing. Findings: The outcomes demonstrated that the traverse speed is more effective upon the surface roughness and is an important factor that damages the top kerf width and the kerf taper angle. Research limitations/implications: Based on the hardness and thickness of the SiC plate, the taper angle is high, and for a feed rate of 10 mm/min, the surface roughness is low. Less thickness of the SiC plate could have a lower taper angle than with high thickness. The erosive force is provided by abrasive material along with the jet stream. Practical implications: Water abrasive fine jet could effectively machinate silicon carbide ceramic material with a better surface finish accurately. Suitable surface roughness with higher productivity can be attained with medium traverse speed. Originality/value: The effect of process parameters on kerf taper angle and top kerf width in the abrasive water jet machining of silicon carbide is explored, considering surface roughness as an important output parameter.
    Źródło:
    Archives of Materials Science and Engineering; 2023, 120, 1; 30--35
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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