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    Wyświetlanie 1-15 z 15
    Tytuł:
    Effects of Physical and Personal Risk Factors on Sick Leave Due to Musculoskeletal Disorders
    Autorzy:
    Motamedzade, M.
    Faghih, M. A.
    Golmohammadi, R.
    Faradmal, J.
    Mohammadi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/90566.pdf
    Data publikacji:
    2013
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    sick leave
    physical risk factors
    musculoskeletal disorders
    assembly workers
    car manufacturing
    czynniki ryzyka
    zwolnienie lekarskie
    zaburzenia układu mięśniowo-szkieletowego
    Opis:
    The purpose of this study was to investigate the effects of physical and personal risk factors on sick leave due to musculoskeletal disorders in an Iranian car company. In this cross-sectional study, 234 workers participated and all of them had sick leave due to musculoskeletal disorders in the past year. A physical risk factor checklist and personal information questionnaire were used as data-gathering tools. There was no significant relationship between physical risk factors and sick leave (p > .05). Cigarette smoking (p = .045), body mass index >30 (p = .046) and age (p = .044) showed a significant relationship with sick leave. Workers with lumbar deviation of 20°–60° (OR 1.10) and >60° (OR 1.11) were at greater risk. The ratios for workers with repetitive work (OR 1.30) and workers with force exertion (OR 1.36) were greater than for other workers. Taking preventive actions to improve the ergonomic working conditions of assembly workers and their lifestyle seems crucial.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2013, 19, 4; 513-521
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Fecal Egg Counts and ELISA for the diagnosis of Dicrocoelium Dendriticum infection
    Autorzy:
    Naeemipour1, M.
    Hashemitabar, Ch.R.
    Dastjerdi, K.
    Jamshidian Mojaver, M.
    Mohammadi, H.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/32321.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    From economical point of view, Dicrocoelium Dendriticum (D. dendriticum) causes a lot of damages to the livestock industry annually. So, the rapid diagnosis of infection is very important. The diagnosis is based on egg per count of feces (EPG) test because detection according to clinical symptoms is difficult. Since EPG is not accurate and sensitive, the serological methods become important for the diagnosis of this parasite as they are more accurate in comparison to EPG test and they are able to diagnose infection in a short time. In this study, somatic and Excretory-secretory antigens (EsAg) were isolated. The ELISA test was set up according to positive and negative sera and the results which were obtained compared to those obtained by the EPG test. The prevalence of infection in 550 samples by ELISA and EPG methods were 56% and 7% respectively, which shows the significant difference between these methods in examining the rate of infection. Based on the results, the specificity and sensitivity in ELISA test were 95% and 94%, respectively. The results showed that the ELISA is a more reliable test in comparison to EPG test for the rapid diagnosis of D. dendriticum infection.
    Źródło:
    Polish Journal of Veterinary Sciences; 2016, 19, 3
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Manual Material Handling Assessment Among Workers of Iranian Casting Workshops
    Autorzy:
    Mohammadi, H.
    Motamedzade, M.
    Faghih, M. A.
    Bayat, H.
    Mohraz, M. H.
    Musavi, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/89709.pdf
    Data publikacji:
    2013
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    musculoskeletal disorders
    manual material handling
    casting workers
    Snook tables
    warsztaty odlewnicze
    zaburzenia układu mięśniowo-szkieletowego
    magazynowanie
    pracownicy odlewni
    Opis:
    Manual material handling (MMH) tasks can be found in most workplaces and they may constitute a risk factor for work-related musculoskeletal disorders (WMSDs). This study was conducted to determine the prevalence of WMSDs and to compare MMH loads with the acceptable weight and force limits among Iranian casting workers. Data were collected from 50 workers of casting workshops who performed MMH tasks. The Nordic musculoskeletal disorders questionnaire and the Snook tables were used as tools for data collection. Hand/wrist symptoms were the most prevalent problems among the workers (84%). The results of the Snook tables showed that the loads in lifting (84%), lowering (86%), carrying (66%), pushing with initial (43%) and sustained force (59%), and pulling tasks with initial (48%) and sustained force (93%) exceeded recommended limits. WMSDs occurred in high rates among the workers and, thus, ergonomics interventions should focus on decreasing WMSDs and redesigning MMH tasks.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2013, 19, 4; 675-681
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some physiological responses of wheat and bean to soil salinity at low matric suctions
    Autorzy:
    Khatar, M.
    Mohammadi, M.H.
    Shekari, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/24475.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    The effect of soil matric suction (2-33 kPa) and salinity (soil solution electrical conductivity 0.7-8 dS m-1 for bean and 2-20 dS m-1 for wheat) on some physiological characteristics of bean and wheat in a clay loam soil under greenhouse condition was investigated. The results showed that the leaf chlorophyll content index and potassium concentration decrease under salinity stress and increase with matric suction from 2 to 33 kPa suction for both plants. The wheat chlorophyll content index declines during the stress spell but bean chlorophyll content index remains nearly constant. The lowest values of the content of soluble sugars and the highest values of leaf proline content are observed at 2 kPa matric suction (highest aeration stress) for bean and wheat. As matric suction increases from 2 to 6 kPa, the soluble sugars increases and proline content decreases significantly and then soluble sugars decreases and proline content increases until 10 kPa suction, and the soluble sugars remains nearly constant at the higher matric suctions for both plants. While the electrical conductivity effect on the soluble sugars is not significant, the values of proline content for both crop increase significantly with electrical conductivity. It was shown that the aeration stress can result in more considerable and rapid physiological responses, in comparison with salinity stress. There is a strong correlation between wheat and bean chlorophyll content index and potassium concentration under salinity and aeration stresses.
    Źródło:
    International Agrophysics; 2017, 31, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of canola chlorophyll index and leaf nitrogen under wide range of soil moisture
    Autorzy:
    Meskini-Vishkaee, F.
    Mohammadi, M.H.
    Neyshabouri, M.R.
    Shekari, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/25557.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    canola
    chlorophyll level
    leaf
    nitrogen
    soil moisture
    plant stress
    environmental stress
    Opis:
    The paper presents a study on the effect of soil matric suction on the variation of leaf chlorophyll index and nitrogen concentration of canola. Results showed that chlorophyll index increases exponentially with soil matric suction, especially at the late season of canola growing time. At moderate matric suction (200 and 300 kPa soil suction heads), chlorophyll index remains nearly constant, but in drier soil (matric suction >300 kPa),chlorophyll index increases gradually with time. Despite the va-riation of the total leaf nitrogen with the soil matric suction, it is similar to the variation of the chlorophyll index, but the results showed that the chlorophyll index – nitrogen concentration curve has a de-marcated bi-modal shape. We suggest that 2.7% of nitrogen and 69.8 of the chlorophyll index value represent the upper limit of the chlorophyll meter reliability for estimation of canola nitrogen under a wide range of soil moisture levels. These results confirm that the chlorophyll meter can be used as an effective tool for rapid and non-destructive estimation of the relative chlorophyll and nitrogen content in canola leaves at a wide range of soil moisture content, except for nearly wilting coefficient or extremely high drought stress.
    Źródło:
    International Agrophysics; 2015, 29, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biocontrol potential of Trichoderma harzianum in controlling wilt disease of pistachio caused by Verticillium dahliae
    Autorzy:
    Fotoohiyan, Z.
    Rezaee, S.
    Bonjar, G.H.S.
    Mohammadi, A.H.
    Moradi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/65568.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biological control
    Trichoderma harzianum
    controlling
    wilt disease
    antagonism
    pistachio
    orchard
    Verticillium dahliae
    Iran
    Opis:
    Verticillium wilt caused by Verticillium dahliae, is one of the most devastating diseases in pistachio orchards in the world including Iran. In search for an eff ective non-chemical strategy for the management of this disease, we evaluated the biocontrol potential of Trichoderma harzianum isolates obtained from the rhizosphere of healthy pistachio trees in diff erent locations of the Kerman province of Iran against V. dahliae under laboratory and greenhouse conditions. Dual culture tests in the laboratory were conducted in a completely randomized design using 72 T. harzianum isolates. Twenty isolates showed the highest in vitro antagonistic activity. Th e results indicated that all 20 isolates were capable of inhibiting the mycelial growth of V. dahliae signifi cantly. Among them, isolates Tr8 and Tr19 were the most eff ective by 88.89% and 85.12% inhibition, respectively. Extracted cell free metabolites of all eff ective isolates also inhibited the growth of V. dahliae in the culture medium signifi cantly. According to the results, isolates Tr4 and Tr6 inhibited fungal pathogen growth by 94.94% and 88.15% respectively, through production of non-volatile metabolites. In the evaluation of volatile metabolites, isolates Tr5 and Tr4 were the most eff ective by 26.27% and 24.49% growth inhibition, respectively. Based on the results of the in vitro experiments, the fi ve most eff ective isolates were selected for evaluation under greenhouse conditions for their biocontrol potential in controlling Verticillium wilt of pistachio. Results of the greenhouse, (in vivo) experiments were positive and indicated that the occurrence of wilt disease in plants treated with the antagonists alone or in combination with pathogenic fungus was lower than in plants inoculated with pathogen alone. Th e overall results of this study suggest that Trichoderma fungal antagonist may be an eff ective biocontrol agent for the control of Verticillium wilt of pistachio.
    Źródło:
    Journal of Plant Protection Research; 2017, 57, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two torymid species (Hymenoptera: Chalcidoidea, Torymidae) developing on Artemisia gall midges (Diptera: Cecidomyiidae)
    Autorzy:
    Lotfalizadeh, H.
    Mohammadi-Khoramabadi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/65617.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Torymidae
    parasitoid
    Hymenoptera
    Chalcidoidea
    Artemisia
    gall midge
    Diptera
    Cecidomyiidae
    distribution
    new record
    Opis:
    Two parasitoid wasps, Torymus artemisiae Mayr and Torymoides violaceus (Nikol’skaya), were reared on Artemisia herba-alba (Asteraceae) galles, in central Iran. Torymus artemisiae and T. violaceus were developed from the gall midges: Rhopalomyia navasi Tavares and R. hispanica Tavares, respectively. The occurrence of these two parasitic wasps in Iran, and their associations with R. navasi and R. hispanica, are new. Data on the wasps’ biological associations and geographical distribution are provided. The parasitoid compositions of the genus Rhopalomyia (Diptera: Cecidomyiidae) were also discussed.
    Źródło:
    Journal of Plant Protection Research; 2015, 55, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of inoculation with Piriformospora indica and Sebacina vermifera on growth of selected Brassicaceae plants under greenhouse conditions
    Autorzy:
    Kari Dolatabadi, H.
    Mohammadi Goltapeh, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2159.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Ogrodnictwa
    Tematy:
    Brassicaceae
    Piriformospora indica
    Sebacina vermifera
    inoculation
    plant height
    dry weight
    greenhouse condition
    Źródło:
    Journal of Horticultural Research; 2013, 21, 2
    2300-5009
    Pojawia się w:
    Journal of Horticultural Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigating ground vibration to calculate the permissible charge weight for blasting operations of Gotvand-Olya dam underground structures
    Badania drgań gruntu w celu określenia dopuszczalnego ciężaru ładunku wybuchowego przy pracach strzałowych w podziemnych elementach tamy w Gotvand-Olya
    Autorzy:
    Soltani-Mohammadi, S.
    Amnieh, H. B.
    Bahadori, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/219562.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    prace strzałowe
    drgania podłoża
    maksymalna prędkość drgań cząstek (PPV)
    algorytm hybrydowy
    blasting
    ground vibration
    peak particle velocity
    simulated annealing algorithm
    Opis:
    Ground vibration, air vibration, fly rock, undesirable displacement and fragmentation are some inevitable side effects of blasting operations that can cause serious damage to the surrounding environment. Peak Particle Velocity (PPV) is the main criterion in the assessment of the amount of damage caused by ground vibration. There are different standards for the determination of the safe level of the PPV. To calculate the permissible amount of the explosive to control the damage to the underground structures of Gotvand Olya dam, use was made of sixteen 3-component (totally 48) records generated from 4 blasts. These operations were recorded in 3 directions (radial, transverse and vertical) by four PG-2002 seismographs having GS-11D 3-component seismometers and the records were analyzed with the help of the DADISP software. To predict the PPV, use was made of the scaled distance and the Simulated Annealing (SA) hybrid methods. Using the scaled distance resulted in a relation for the prediction of the PPV; the precision of the relation was then increased to 0.94 with the help of the SA hybrid method. Relying on the high correlation of this relation and considering a minimum distance of 56.2 m to the center of the blast site and a permissible PPV of 178 mm/s (for a 2-day old concrete), the maximum charge weight per delay came out to be 212 Kg.
    Drgania gruntu, rozchodzenie się drgań w powietrzu, rozrzut skał, ich niepożądane przemieszczenia i rozdrobnienie to nieuchronne skutki prowadzenia prac strzałowych, które spowodować mogą poważne spustoszenie w środowisku naturalnym. Maksymalna prędkość drgań cząstek (PPV) to główne kryterium przy ocenie szkód spowodowanych przez drgania podłoża. Istnieje wiele norm określających bezpieczne poziomy prędkości drgań cząstek (PPV). Obliczenie dopuszczalnej wielkości ładunku wybuchowego w taki sposób, by zapobiegać uszkodzeniom podziemnych elementów tamy Gotvand Olya opiera się na wykorzystaniu 16 3-elementowych zestawów danych zarejestrowanych w trakcie 4 wybuchów. Procedura rejestracji obejmuje zapisy drgań w 3 kierunkach (promieniowe, poprzeczne i pionowe) zarejestrowane przez 4 sejsmografy wyposażone w sejsmometry GS-11D, zaś same zapisy analizowano przy wykorzystaniu oprogramowania DADISP. Przewidywanie prędkości drgań cząstek odbywa się w oparciu o skalowanie odległości oraz metody hybrydowe Simulated Annealing (S.A.). W wyniku skalowania odległości otrzymujemy wzorów na prędkość drgań cząstek, przy wykorzystaniu metod hybrydowych dokładność obliczeń wzrasta do 0.94. Wykorzystując wysoki stopień korelacji wynikający ze wzoru, uwzględniając minimalną odległość 56.2 m od epicentrum wybuchu oraz dozwolony poziom prędkości drgań cząstek gruntu 178 mm/s (dla dwudniowego betonu), otrzymujemy maksymalną wielkość ładunku na pojedynczy wystrzał na poziomie 212 Kg.
    Źródło:
    Archives of Mining Sciences; 2012, 57, 3; 687-697
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Bacillus isolated from intestine of Persian sturgeon (Acipenser persicus) comparing with commercial probiotics
    Autorzy:
    Tabari, M.
    Tabari, K.
    Karimzadegan, H.
    Mohammadi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/11072.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Źródło:
    International Letters of Natural Sciences; 2016, 60
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Temperature Corrosion Performance of Carbon Steel Coated with Iron Aluminide in Mixture of O2 and SO2 Atmosphere
    Autorzy:
    Omranian-Mohammadi, P.
    Raiszadeh, R.
    Shahverdi, H. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/352419.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    iron aluminide
    high temperature corrosion
    plain carbon steel
    Opis:
    In this investigation the surface of an aluminized sample of plain carbon steel was melted and alloyed using a tingsten inert gas (TIG) welding process to produce iron-aluminide intermetallic phases on the surface. The produced coating was then characterized by SEM and EDS and its high-temperature properties in O2 + 1%SO2 gas were examined. The results showed that the Fe3 Al coating produced could protect the substrate as it was subjected to the corroding gases at 700°C due to the formation of an alumina layer between the substrate and an outer layer of Fe2 O3 . At 900°C, the coating could only protect the substrate for 64 h. The lack of further protection at this temperature is attributed to the decrease in the protective properties of alumina with an increase in its temperature and the lack of presence of enough Al atoms in the coating for the repair of the defects formed in the alumina layer.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 529-538
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Virtual water evaluation for grains products in Iran. Case study: pea and bean
    Ocena wirtualnej wody w produkcji ziarna w Iranie – przykład grochu i fasoli
    Autorzy:
    Yousefi, H.
    Mohammadi, A.
    Mirzaaghabeik, M.
    Noorollahi, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/292973.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    grains
    virtual water trade
    water crisis
    water use efficiency
    handel wirtualną wodą
    kryzys wodny
    wydajność zużycia wody
    ziarno
    Opis:
    Shortage of water is considered as one of the most important straits of agricultural development in Iran. The main purpose of this study is to determine virtual water used to pea and bean production and water use efficiency, select the best area for cultivating these two grains and find the virtual water budget for the aforementioned grains. The results showed that among the three provinces main producers of pea in Iran, the highest virtual water of pea belongs to Lorestan with 3534 dm3·kg–1 and the lowest belongs to West Azerbaijan with 2660 dm3·kg–1 in irrigated cultivation. Water use efficiency in irrigated cultivation in Kermanshah and West Azerbaijan are at the same level; however, Kermanshah has enjoyed much more level of virtual water. For beans, the highest amount of virtual water in irrigated cultivation belongs to Lorestan (3651 dm3·kg–1) and the lowest amount refers to Markazi (2725 dm3·kg–1) and also the highest level of water use efficiency for this product refers to Markazi. Also it was found that 160.15 mln m3 of water has been exported from the country water resources by these products so virtual water budget for studied crops were negative.
    Deficyt wody uznawany jest za jeden z najważniejszych problemów rozwoju rolnictwa w Iranie. Głównym celem badań przedstawionych w pracy jest oznaczenie ilości wody wirtualnej zużywanej do produkcji grochu i fasoli oraz wydajności zużycia wody, wybór najlepszych terenów do uprawy obu roślin i sporządzenie dla nich bilansu wirtualnej wody. Uzyskane wyniki wykazały, że spośród trzech prowincji – głównych producentów grochu w Iranie – największą objętość wirtualnej wody (3534 dm3·kg–1) zużywa się do nawadnianych upraw w Lorestanie, a najmniejszą (2660 dm3·kg–1) – do nawadnianych upraw w prowincji Zachodni Azerbejdżan. Wydajność zużycia wody w nawadnianych uprawach w Kermanshah i Zachodnim Azerbejdżanie była podobna, a uprawy w Kermanshah cechowało większe zużycie wody wirtualnej. Do produkcji fasoli największą objętość wirtualnej wody stwierdzono w Lorestanie (3651 dm3·kg–1), a najmniejszą w Markazi (2725 dm3·kg–1), gdzie stwierdzono także największą wydajność zużycia wody. Obliczono także, że – eksportując te produkty roślinne – wysłano za granicę 160,15 milionów m3 wody wirtualnej, skutkiem czego bilans wodny badanych upraw był ujemny.
    Źródło:
    Journal of Water and Land Development; 2017, 35; 275-280
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Designing a simple radiometric system to predict void fraction percentage independent of flow pattern using radial basis function
    Autorzy:
    Roshani, G. H.
    Nazemi, E.
    Shama, F.
    Imani, M. A.
    Mohammadi, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/221419.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    two-phase flow
    gamma-ray attenuation
    scintillation detector
    void fraction
    artificial neural network
    Opis:
    The void fraction is one of the most important parameters characterizing a multiphase flow. The prediction of the performance of any system operating with more than single phase relies on our knowledge and ability to measure the void fraction. In this work, a validated simulation study was performed in order to predict the void fraction independent of the flow pattern in gas-liquid two-phase flows using a gamma ray 60Co source and just one scintillation detector with the help of an artificial neural network (ANN) model of radial basis function (RBF). Three used inputs of ANN include a registered count under Compton continuum and counts under full energy peaks of 1173 and 1333 keV. The output is a void fraction percentage. Applying this methodology, the percentage of void fraction independent of the flow pattern of a gas-liquid two-phase flow was estimated with a mean relative error less than 1.17%. Although the error obtained in this study is almost close to those obtained in other similar works, only one detector was used, while in the previous studies at least two detectors were employed. Advantages of using fewer detectors are: cost reduction and system simplification.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 2; 347-358
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fault Current Limiter optimal sizing considering different Microgrid operational modes using Bat and Cuckoo Search Algorithm
    Autorzy:
    Arani, A. A. K.
    Bayati, N.
    Mohammadi, R.
    Gharehpetian, G. B.
    Sadeghi, S. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/140644.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fault current limiter (FCL)
    Bat Algorithm (BA)
    Cuckoo Search Algorithm (CSA)
    microgrid (MG)
    Opis:
    Nowadays, the development of smart grids has been the focus of attention due to its advantages for power systems. One of the aspects of smart grids defined by using distributed generation (DG) in a low voltage network is a microgrid (MG). Based on its operational states, MG can operate in different configurations such as grid-connected mode or off-grid mode. The switching between these states is one of the challenging issues in this technical area. The fault currents in different buses have higher value compared to islanded mode of MG when the MG is connected to the main grid, which influences the protection equipment. In this situation, some electrical devices may be damaged due to the fault currents. Application of a fault current limiter (FCL) is considered as an effective way to overcome this challenge. The optimal size of these FCLs can optimize the performance of an MG. In this paper, an index for FCL size optimization has been used. In addition, two optimization algorithms (Bat Algorithm and Cuckoo Search Algorithm) have been applied to the problem. The application of an FCL has been studied in grid-connected and islanded-mode. In addition, the application of the capacitor bank in both modes has been investigated. The results of simulations carried out by MATLAB have been presented and compared.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 2; 321--332
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric estimation of water retention using mGMDH method and principal component analysis
    Autorzy:
    Neyshaburi, M.R.
    Bayat, H.
    Rastgou, M.
    Mohammadi, K.
    Gregory, A.S.
    Nariman-Zadeh, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/905465.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Opis:
    Performing a primary analysis, such as principal component analysis (PCA) may increase accuracy and reliability of developed pedotransfer functions (PTFs). This study focuses on the usefulness of the soil penetration resistance (PR) and principal components (PCs) as new inputs along with the others to develop the PTFs for estimating the soil water retention curve (SWRC) using a multi-objective group method of data handling (mGMDH). The Brooks and Corey (1964) SWRC model was used to give a description of the water retention curves and its parameters were determined from experimental SWRC data. To select eight PCs, PCA was applied to all measured or calculated variables. Penetration resistance, organic matter (OM), aggregates mean weight diameter (MWD), saturated hydraulic conductivity (Ks), macro porosity (Mp), micro porosity (Mip) and eight selected PCs were used as predictors to estimate the Brooks and Corey model parameters by mGMDH. Using PR or OM, Ks and MWD, improved the estimation of SWRC in some cases. Using the predicted PR can be useful in the estimation of SWRC. Using either the MP and Mip or the eight PCs significantly improved the PTFs accuracy and reliability. It would be very useful to apply PCA on the original variables as a primary analysis to develop parametric PTFs.
    Źródło:
    Polish Journal of Soil Science; 2016, 49, 1
    0079-2985
    Pojawia się w:
    Polish Journal of Soil Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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