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    Wyświetlanie 1-4 z 4
    Tytuł:
    Phenotypic and molecular characterization of the causal agent of chafer beetle mortality in the wheat fields of the Kurdistan province, Iran
    Autorzy:
    Karimi, K.
    Arzanlou, M.
    Ahari, A.B.
    Ghazi, M.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/65470.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phenotypic characteristics
    molecular characteristics
    causal agent
    chafer beetle zob.scarab beetle
    Anisoplia austriaca
    scarab beetle
    mortality
    wheat field
    Kurdistan region
    Iran
    Opis:
    We report the first case of chafer beetle [Anisoplia austriaca (Herbst 1783)] mortality caused by Actinomucor elegans var. elegans in wheat fields of the Kurdistan province, Iran. For three years, dead larvae of Anisoplia austriaca were collected from wheat fields of the Kurdistan province. Similar isolates of a fast-growing fungus were recovered from all samples. The fungal isolates were identified as A. elegans var. elegans based on morphological and cultural characteristics. The identity of the species was further confirmed using sequence data of the ITS (Internal Transcribed Spacer) region of ribosomal DNA. Koch’s postulates were fulfilled by the inoculation of the larvae of A. austriaca and Galleria mellonella (Linnaeus, 1758) (as the model insect) using the spore suspension of A. elegans var. elegans. The viability of sporangiospores was evaluated using a spore dilution technique on germination medium. The results on the pathogenicity (100% mortality in A. austriaca larvae) and viability tests (germination: 95.45%) demonstrated that A. elegans var. elegans can be considered as a potential biocontrol agent against the chafer beetle. Field experiments are still required to evaluate the capacity of A. elegans as a biological control agent.
    Źródło:
    Journal of Plant Protection Research; 2015, 55, 3
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A New Downlink Scheduling Algorithm Proposed for Real Time Traffic in LTE System
    Autorzy:
    Mahfoudi, M.
    EL Bekkali, M.
    Najid, S.
    Mazer, S.
    EL Ghazi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/227115.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    QoS
    real-time traffic
    scheduling strategies
    Opis:
    The Third Generation Partnership Project (3GPP) has developed a new cellular standard based packet switching allowing high data rate, 100 Mbps in Downlink and 50 Mbps in Uplink, and having the flexibility to be used in different bandwidths ranging from 1.4 MHz up to 20 MHz, this standard is termed LTE (Long Term Evolution). Radio Resource Management (RRM) procedure is one of the key design roles for improving LTE system performance, Packet scheduling is one of the RRM mechanisms and it is responsible for radio resources allocation, However, Scheduling algorithms are not defined in 3GPP specifications. Therefore, it gets a track interests for researchers. In this paper we proposed a new LTE scheduling algorithm and we compared its performances with other well known algorithms such as Proportional Fairness (PF), Modified Largest Weighted Delay First (MLWDF), and Exponential Proportional Fairness (EXPPF) in downlink direction. The simulation results shows that the proposed scheduler satisfies the quality of service (QoS) requirements of the real-time traffic in terms of packet loss ratio (PLR), average throughput and packet delay. This paper also discusses the key issues of scheduling algorithms to be considered in future traffic requirements.
    Źródło:
    International Journal of Electronics and Telecommunications; 2015, 61, 4; 409-414
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of multi extrusion die process on mechanical and chemical behavior of 2024-T3 alloy
    Autorzy:
    Razooqi, Ahmed Ibrahim
    Abbas, Naseer M.
    Ghazi, Sara Saad
    Powiązania:
    https://bibliotekanauki.pl/articles/2174206.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    wyciskanie
    odkształcenie plastyczne
    korozja elektrochemiczna
    Al 2024-T3
    extrusion
    plastic deformation
    electrochemical corrosion
    Opis:
    In this paper, a cold multi-pass extrusion process for a 15mm in diameter solid 2024-T3 aluminum alloy rod was carried out using three dies to obtain three different diameters of 14mm, 13mm, and 12mm. The microstructure, hardness, and corrosion behavior were investigated before and after the extrusion process. Load-Displacement data were recorded during each extrusion process. The electrochemical corrosion test was made in a 3.5 wt.% NaCl solution using potentiostat instrument under static potentials test. Corrosion current was recorded to determine the corrosion rate for specimens. The results showed that the extrusion load increased with the number of extrusion passes, which is also seen in hardness test results. In addition, the corrosion rate decreased with the increase in the number of extrusion passes. This is due to severe plastic deformation, which generates a fine grain structure of (AlCu) and (AlCuMg) components.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 163--170
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Different Wavelength Propagations over Few-Mode Fiber based on Space Division Multiplexing in Conjunction with Electrical Equalization
    Autorzy:
    Al-Dawoodi, A.
    Fareed, A.
    Masuda, T.
    Ghazi, A.
    Fakhrudeen, A. M.
    Aljunid, S. A.
    Idrus, S. Z. S.
    Amphawan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/226328.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    few-mode fiber
    nonlinear distortions
    decision feedback equalizer
    eye diagram
    BER
    Opis:
    Nonlinearities in optical fibers deteriorate system performances and become a major performance-limiting issue. This article aims to investigate the compensation of nonlinear distortions in optical communication systems based on different wavelength propagations over few-mode fiber (FMF). The study adopted Space Division Multiplexing (SDM) based on decision feedback equalizer (DFE). Various transmission wavelength of the FMF system is applied to mitigate the attenuation effect on the system. In this paper, different wavelengths (780, 850 and 1550 nm) are used in SDM. Extensive simulation is performed to assess the attenuation and Bit Error Rate (BER) in each case. The results show that the wavelength of 1550 nm produces higher power and less attenuation in the transmission. Furthermore, this wavelength produces the best distance with less BER compared to 780 nm and 850 nm wavelengths. Moreover, the validations show improvement in BER and eye diagram.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 1; 5-10
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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