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Articles by A. Ramli
Total Records ( 6 ) for A. Ramli
  Rania A. Mokhtar , Sabira Khatun , B.M. Ali and A. Ramli
  Problem statement: Cognitive radio is a candidate technology for more efficient spectrum utilization systems based on opportunistic spectrum sharing. However, a common assumption regarding cognitive radios is that they are unlicensed spectrum users that should defer to (avoid interfering with) existing primary sources. Therefore effective sensing of primary users was a major focus of current research. Cooperative spectrum sensing had been proposed to overcome the problem associated with the local sensing node problem-due to noise uncertainty, fading and shadowing. However, reporting the sensing result required perfect channel to avoid degradation in sensing performance due to fading. It also required a large bandwidth assuming large number of cognitive user. Approach: In this study we presented a hard decision auto-correction reporting scheme that directly corrects the errors in the reported bit and further minimizes the average number of reporting bits by allowing only the user with a detection information to report its result. We used analytical formulation to investigate the reporting scheme, by employing such selection technique; the reporting error due to the fading channel was reduced. Results: The sensing performance was investigated and we showed through simulations and probabilistic analysis the sensing performance improvements achieved via the proposed method. Numerical result showed much decrease in reporting bit without affecting the sensing performance.
  I. Izirwan , A. Ramli , F. Ahmad Zakil , M. Hirano , N. Komine and S. Komiya
 
Dear Editor,
Journal of Applied Sciences

I, Izirwan Bin Izhab, Corresponding Author, request that the paper entitled “Molecular Transformation of 2,6-Benzopyran Derivative from Reaction of Oxaruthenacycle Complex with Dimethyl Acetylenedicarboxylate” published in Journal of Applied Sciences 9 (17): 3176-3179, 2009 be withdrawn.

The article was based on my master data supervised by Profs. Komiya, Hirano and Komine and was published without getting their consent and they were not agreeing to become the co-authors. Moreover, the corresponding article had been published elsewhere before submission of this article.

I apologize to the Journal of Applied Sciences for the inconvenience. We hold the Journal of Applied Sciences in high regard and assure you these errors were not intentional or of deceptive intent. I further apologize to my supervisors for any difficulties caused by the publication of this paper.



Izirwan Bin Izhab
Corresponding Author

  A. Ramli and M.I. Suhaina
  MoVSb and MoVNb mixed oxide catalysts were prepared using reflux method for the propane ammoxidation reaction to acrylonitrile. These catalysts were characterized using N2 physisorption (BET), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and catalytic tests. The catalytic testing shows that the MoVSbO catalyst has higher selectivity to ACN but lower conversion of propane as compared to MoVNbO catalyst.
  I. Izirwan , A. Ramli , F. Ahmad Zakil , M. Hirano , N. Komine and S. Komiya
  I, Izirwan Bin Izhab, Corresponding Author, request that the paper entitled “Molecular Transformation of 2,6- Benzopyran Derivative from Reaction of Oxaruthenacycle Complex with Dimethyl Acetylenedicarboxylate” published in Journal of Applied Sciences 9 (17): 3176-3179, 2009 be withdrawn. The article was based on my master data supervised by Profs. Komiya, Hirano and Komine and was published without getting their consent and they were not agreeing to become the co-authors. Moreover, the corresponding article had been published elsewhere before submission of this article. I apologize to the Journal of Applied Sciences for the inconvenience. We hold the Journal of Applied Sciences in high regard and assure you these errors were not intentional or of deceptive intent. I further apologize to my supervisors for any difficulties caused by the publication of this paper.
  S.E. Eliana Misi , A. Ramli and F.H. Rahman
  Production of hydrogen gas from biomass gasification usually comes with several problems such as the existence of unacceptable level of tars and also ineffectiveness of the catalysts performance due to coke deposition. In order to eliminate most of the inconvenience encountered, new types of catalyst have been developed. In this study, bimetallic Fe and Ni supported on zeolite beta have been prepared by incipient wetness impregnation method with different calcination temperatures (500-700°C). The interaction of active metals and support on the structure, metals transition and reduction were characterized by physicochemical techniques such as BET, XRD, FESEM-EDX and TPR. The results showed that the active metals incorporated with zeolite beta in bimetallic systems exhibit a strong Fe-Ni/BEA interaction, which stabilises Fe3+ and Ni2+ ions in the lattice. Reducibility of nickel increased in the presence of Fe, which was confirmed by the combination of active metals reduction peaks attributed to weak interaction with the support, Fe2O3 to Fe3O4 to FeO and strong interaction with the support between FeAl2O4 and NiAl2O4. Bimetallic catalysts have a bigger surface area with increasing calcination temperatures, which is closely related to high activity in the gasification reaction. It was found that different calcination temperatures give a significant effect to the precursor whereby Feni/BEA (600°C) showed better physicochemical properties than other samples with high reducibility even though it has low surface area.
  M. Farooq , A. Ramli , S. Gul and N. Muhammad
  Vegetable oils due to high biodegradability, low toxicity, renewability and excellent lubricating performance, have immense potential to replace mineral oils as feedstock for lubricants. Owing to these aspects environmentalists and engineers have made attempts to explore the possibilities of using vegetable oils as environmentally friendly lubricants for range of applications. In this work, the tribological properties of castor oil and sesame oil in the presence of 12-hydroxystearic acid as anti-wear additive were investigated using four-ball tribometer. The viscosity, acid value, peroxide value and iodine value of the selected oils were determined experimentally following AOCS methods. Results revealed that the addition of 12-hydroxystearic acid improved the anti-wear performance of the selected vegetable oils. Moreover, it was noted from the results that 12-hydroxystearic acid was more effective as anti-wear additive in the castor oil as compared to sesame oil under similar experimental conditions. The improved anti-wear performance of the selected vegetable oils in the presence of additive may be attributed to the formation of protective layer as a result of tribochemical reaction on the metal surface.
 
 
 
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