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Wyszukujesz frazę "Akhter, J. I." wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Performance Evaluation of Cognitive Radio Network Based on 2-D Markov Chain
Autorzy:
Islam, M. I.
Rabbi, M. F.
Khan, R. T.
Akhter, J.
Powiązania:
https://bibliotekanauki.pl/articles/958115.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cognitive radio networks
misdetection
probability of false alarm
throughput and traffic of limited channel
Opis:
The objective of cognitive radio network is to enhance the wireless network spectrum utilization. In such a network, two types of users are enlisted, namely primary user (PU) and secondary user (SU). The PU can access any channel in case of its availability, but SU users have lower priority and can access a channel only when it is unused by PUs. The performance of such a network solely depends on two traffic parameters: probability of false alarm and probability of misdetection. In this paper the performance of such a network is analyzed based on two dimensional Markov chain including those parameters. The main contribution of this paper is to evaluate blocking probability and PU and SU throughput using the state transition chain instead of existing statistical analysis.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 3; 39-44
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Bonded Zone and Evaluation of Cracking in Vacuum Brazed Zircaloy-4 and Stainless Steel-316L Joint
Autorzy:
Munis, A.
Zheng, Maosheng
Akhter, J. I.
Ahmad, M.
Powiązania:
https://bibliotekanauki.pl/articles/355198.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bonded zone
BZ
intermetallics
vacuum brazing
interlayer
cracking
Opis:
Brazing of two dissimilar structural materials; Zircaloy-4 and SS-316L was performed at 900°C under high vacuum conditions. The metallic glass ribbons (Zr55Cu30Al10Ni2Fe3-at.%) of 30 μm thickness, were used as an interlayer. The bonded region was characterized by scanning electron microscope (SEM), energy dispersive spectroscope (EDS) and microhardness testing. The metallurgical bond formation was due to compositional changes in the molten interlayer and later on its subsequent solidification. Assessment of the bonded zone (BZ) revealed three distinct regions (Region-I, Region-II and Region-III). Diffusion transformation was observed in Region-I and Region-III which were interface with base alloys SS-316L and Zircaloy-4 respectively. However, Region-II at the middle of the BZ was composed of isothermally and athermally solidified portions. The highest values of Microhardness were observed in Region-III which was due to the presence of hard phases. Moreover, a crack parallel to BZ was observed in Region-III and was attributed to differential contraction of base alloys during cooling. Maximum shear stress acting on the BZ was calculated and correlated to the brittle phase cracking.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 707-713
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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