Documents disponibles écrits par cet auteur

An efficient FPGA-based dynamic partial reconfiguration design flow and environment for image and signal processing IP cores / B. Krill in Signal processing. Image communication, Vol. 25 N° 5 (Juin 2010) 

Public ISBD [article]  in Signal processing. Image communication > Vol. 25 N° 5 (Juin 2010) . - pp. 377–387 Titre : An efficient FPGA-based dynamic partial reconfiguration design flow and environment for image and signal processing IP cores Type de document : texte imprimé Auteurs : B. Krill, Auteur ; A. Ahmad, Auteur ; A. Amira, Auteur Année de publication : 2012 Article en page(s) : pp. 377–387 Note générale : Electronique Langues : Anglais (eng) Mots-clés : Dynamic  partial  reconfiguration  (DPR)  Design  flow  Field  programmable  gate  array  (FPGA)  IP  cores  Image  and  signal  processing Résumé : This paper describes a dynamic partial reconfiguration (DPR) design flow and environment for image and signal processing algorithms used in adaptive applications. Based on the evaluation of the existing DPR design flow, important features such as overall flexibility, application and standardised interfaces, host applications and DPR area/size placement have been taken into consideration in the proposed design flow and environment. Three intellectual property (IP) cores used in pre-processing and transform blocks of compression systems including colour space conversion (CSC), two-dimensional biorthogonal discrete wavelet transform (2-D DBWT) and three-dimensional Haar wavelet transform (3-D HWT) have been selected to validate the proposed DPR design flow and environment. Results obtained reveal that the proposed environment has a better solution providing: a scriptable program to establish the communication between the field programmable gate array (FPGA) with IP cores and their host application, power consumption estimation for partial reconfiguration area and automatic generation of the partial and initial bitstreams. The design exploration offered by the proposed DPR environment allows the generation of efficient IP cores with optimised area/speed ratios. Analysis of the bitstream size and dynamic power consumption for both static and reconfigurable areas is also presented in this paper. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596510000494 [article] An efficient FPGA-based dynamic partial reconfiguration design flow and environment for image and signal processing IP cores [texte imprimé] / B. Krill, Auteur ; A. Ahmad, Auteur ; A. Amira, Auteur . - 2012 . - pp. 377–387. Electronique Langues : Anglais (eng) in Signal processing. Image communication > Vol. 25 N° 5 (Juin 2010) . - pp. 377–387 Mots-clés : Dynamic  partial  reconfiguration  (DPR)  Design  flow  Field  programmable  gate  array  (FPGA)  IP  cores  Image  and  signal  processing Résumé : This paper describes a dynamic partial reconfiguration (DPR) design flow and environment for image and signal processing algorithms used in adaptive applications. Based on the evaluation of the existing DPR design flow, important features such as overall flexibility, application and standardised interfaces, host applications and DPR area/size placement have been taken into consideration in the proposed design flow and environment. Three intellectual property (IP) cores used in pre-processing and transform blocks of compression systems including colour space conversion (CSC), two-dimensional biorthogonal discrete wavelet transform (2-D DBWT) and three-dimensional Haar wavelet transform (3-D HWT) have been selected to validate the proposed DPR design flow and environment. Results obtained reveal that the proposed environment has a better solution providing: a scriptable program to establish the communication between the field programmable gate array (FPGA) with IP cores and their host application, power consumption estimation for partial reconfiguration area and automatic generation of the partial and initial bitstreams. The design exploration offered by the proposed DPR environment allows the generation of efficient IP cores with optimised area/speed ratios. Analysis of the bitstream size and dynamic power consumption for both static and reconfigurable areas is also presented in this paper. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596510000494

Impeding corrosion of sintered NdFeB magnets with titanium nitride coating / A. Ali in Materials and corrosion, Vol. 61 N° 2 (Fevrier 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 2 (Fevrier 2010) . - pp. 130–135 Titre : Impeding corrosion of sintered NdFeB magnets with titanium nitride coating Type de document : texte imprimé Auteurs : A. Ali, Auteur ; A. Ahmad, Auteur ; K. M. Deen, Auteur Année de publication : 2010 Article en page(s) : pp. 130–135 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Electrochemical  impedance  spectroscopy;  pits  re-passivation;  sintered  NdFeB  Magnets Résumé : Sintered NdFeB magnets have poor corrosion resistance that renders them susceptible to corrosion in industrial and marine environments. This paper evaluates the properties of cathodic arc physical vapour deposited (CAPVD) titanium nitride coating for corrosion protection of sintered NdFeB permanent magnets. The performance of titanium nitride coating has been compared to the electrodeposited nickel–copper–nickel multilayer coating. The rates of coatings degradation in simulated marine environment were estimated with electrochemical impedance spectroscopy (EIS). Cyclic polarization was carried out to assess the pitting potential. The surface chemistry and coating morphologies were studied with scanning electron microscope (SEM). X-ray diffraction (XRD) was used for qualitative phase analyses of coatings and the substrate. It was figured out that the charge transfer resistance of CAPVD titanium nitride coating increased with exposure time. The negative rate of Rp-degradation for titanium nitride coating compared to the nickel–copper–nickel multilayer for equivalent exposure time is a unique and valuable result. Polarization results showed that ‘pits re-passivation’ of titanium nitride coating could be responsible for the extended corrosion protection of the NdFeB substrate. The magnetic properties remained comparable for both types of coatings. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905265/abstract [article] Impeding corrosion of sintered NdFeB magnets with titanium nitride coating [texte imprimé] / A. Ali, Auteur ; A. Ahmad, Auteur ; K. M. Deen, Auteur . - 2010 . - pp. 130–135. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 2 (Fevrier 2010) . - pp. 130–135 Mots-clés : Electrochemical  impedance  spectroscopy;  pits  re-passivation;  sintered  NdFeB  Magnets Résumé : Sintered NdFeB magnets have poor corrosion resistance that renders them susceptible to corrosion in industrial and marine environments. This paper evaluates the properties of cathodic arc physical vapour deposited (CAPVD) titanium nitride coating for corrosion protection of sintered NdFeB permanent magnets. The performance of titanium nitride coating has been compared to the electrodeposited nickel–copper–nickel multilayer coating. The rates of coatings degradation in simulated marine environment were estimated with electrochemical impedance spectroscopy (EIS). Cyclic polarization was carried out to assess the pitting potential. The surface chemistry and coating morphologies were studied with scanning electron microscope (SEM). X-ray diffraction (XRD) was used for qualitative phase analyses of coatings and the substrate. It was figured out that the charge transfer resistance of CAPVD titanium nitride coating increased with exposure time. The negative rate of Rp-degradation for titanium nitride coating compared to the nickel–copper–nickel multilayer for equivalent exposure time is a unique and valuable result. Polarization results showed that ‘pits re-passivation’ of titanium nitride coating could be responsible for the extended corrosion protection of the NdFeB substrate. The magnetic properties remained comparable for both types of coatings. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905265/abstract

Performance of Cu and Cu-Zn alloy in the Arabian Gulf environment / H. Saricimen in Materials and corrosion, Vol. 61 N° 1 (Janvier 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 1 (Janvier 2010) . - pp. 22-29 Titre : Performance of Cu and Cu-Zn alloy in the Arabian Gulf environment Type de document : texte imprimé Auteurs : H. Saricimen, Auteur ; A. Quddus, Auteur ; A. Ahmad, Auteur Année de publication : 2010 Article en page(s) : pp. 22-29 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Atmosphere;  brass;  chloride;  copper;  corrosion;  corrosion  rate;  splash  zone;  sulfate;  underground;  weight  loss Résumé : Corrosion performance of copper and brass coupons during 15 month exposure in atmosphere, underground and splash zone conditions was undertaken at Khaleej Mardumah test site located in the industrial/coastal city of Jubail along the Arabian Gulf coast, Saudi Arabia. The environmental indicators such as soil, groundwater, seawater, and air particulate samples were assessed. The exposed corrosion coupons were examined by scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and X-ray fluorescence (XRF) to identify the corrosion products and study their surface morphology. Corrosion rate was determined by weight loss method. The experimental results indicated that a high degree of variation in temperature and humidity in this region combined with high chloride and sulfate concentrations was primarily responsible for the corrosion of copper and brass at Khaleej Mardumah test site. Underground environment was the most corrosive to both copper and brass coupons studied, followed by splash zone. Corrosion rates were found to range from 4.29 to 10.84 µm/y for copper and from 2.47 to 29.31 µm/y for brass. Corrosion rates of copper and brass obtained in this study are also compared with those reported for other locations worldwide. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905240/abstract [article] Performance of Cu and Cu-Zn alloy in the Arabian Gulf environment [texte imprimé] / H. Saricimen, Auteur ; A. Quddus, Auteur ; A. Ahmad, Auteur . - 2010 . - pp. 22-29. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 1 (Janvier 2010) . - pp. 22-29 Mots-clés : Atmosphere;  brass;  chloride;  copper;  corrosion;  corrosion  rate;  splash  zone;  sulfate;  underground;  weight  loss Résumé : Corrosion performance of copper and brass coupons during 15 month exposure in atmosphere, underground and splash zone conditions was undertaken at Khaleej Mardumah test site located in the industrial/coastal city of Jubail along the Arabian Gulf coast, Saudi Arabia. The environmental indicators such as soil, groundwater, seawater, and air particulate samples were assessed. The exposed corrosion coupons were examined by scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and X-ray fluorescence (XRF) to identify the corrosion products and study their surface morphology. Corrosion rate was determined by weight loss method. The experimental results indicated that a high degree of variation in temperature and humidity in this region combined with high chloride and sulfate concentrations was primarily responsible for the corrosion of copper and brass at Khaleej Mardumah test site. Underground environment was the most corrosive to both copper and brass coupons studied, followed by splash zone. Corrosion rates were found to range from 4.29 to 10.84 µm/y for copper and from 2.47 to 29.31 µm/y for brass. Corrosion rates of copper and brass obtained in this study are also compared with those reported for other locations worldwide. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905240/abstract