Saiful Fazamil Mohd Ali - Academia.edu (original) (raw)
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Papers by Saiful Fazamil Mohd Ali
DOAJ (DOAJ: Directory of Open Access Journals), 2022
Automotive paint is frequently encountered as trace evidence in forensic investigation. Beside mi... more Automotive paint is frequently encountered as trace evidence in forensic investigation. Beside microscopic and instrumental examinations, frequency of occurrence data may help the investigator to assess the value of paint evidence. This study aimed to investigate the on the road automobile paint colour distribution in selected cities in Malaysia, namely Kuala Lumpur, Petaling Jaya, Shah Alam, Johor Bahru, Nilai, Kuala Terengganu and Kota Bharu. Out of 7,553 moving vehicles randomly sampled in the seven different locations, light grey, white and black were the top three colours, making up about 52% of the total car population. When the data from two cities, i.e. Kota Bharu dan Kuala Terengganu were compared to the survey conducted in 2011, there was significant difference at 95% significant level which indicated the dynamic distribution of Malaysian automotives. Hence, the information from this survey could support forensic opinion when the assessment on evidential value is requested.
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2000
Effects of cetyltrimethylammonium bromide (CTABr) micelles on second-order rate constants (kn obs... more Effects of cetyltrimethylammonium bromide (CTABr) micelles on second-order rate constants (kn obs) for the nucleophilic reactions of amines (n-butylamine, piperidine, and pyrrolidine) with ionized phenyl salicylate (PS-) reveal a decrease of nearly 4-fold for n-butylamine, 13-fold for piperidine, and 17-fold for pyrrolidine with an increase in [CTABr]T from 0.0 to 0.01 M at 35°C. These results show that the binding constants (KN) of amines with CTABr micelles vary in the order KN for n-butylamine > KN for piperidine > KN for pyrrolidine. The observed data are explained in terms of the pseudophase model of the micelle. The values of KN for n-butylamine, piperidine, and pyrrolidine turn out to be so small that they could not be determined kinetically. The significantly lower rate of aminolysis in the micellar pseudophase compared to that in the aqueous pseudophase is attributed to both micellar medium effect and different locations of amine and PSin the micellar pseudophase.
PLOS ONE
The topcoat color of motor vehicles offers vital information while investigating vehicular accide... more The topcoat color of motor vehicles offers vital information while investigating vehicular accidents, especially in instance of hit-and-run, since witnesses seldom perceive and retain the plate details. Differences in color perceptions among individuals with normal vision may lead to confusion in determining the color of the car involved. In this way, witnesses of crash accidents could potentially initiate flawed leads in forensic investigation, and thus affect the administration of justice. In this study, the inter-rater reliability of vehicle color determination by different volunteers was explored. Six individuals observed the topcoat colors of 500 stationary and 500 moving vehicles from five locations, employing a common system of color gradation. The outcome was binary: the vehicle color was either a "match" or "non-match". This was followed by statistical analysis in terms of the colors' frequencies and inter-rater reliability, based on which more suitable color descriptions were determined for subsequent comparisons of stationary and moving vehicles. Higher match frequencies and greater interrater reliability were observed when color gradations were disregarded. The frequency of correct matches could have been closely related to their relative on-the-road distribution, regardless of the statuses of observed vehicles. It was also found that black and white were associated with a greater number of matches than were intermediate colors, which should be carefully interpreted during forensic investigation to avoid wrong leads. In conclusion, the present study demonstrated the forensic significance of vehicle topcoat color determination, particularly in cases where witness statements are crucial.
The Journal of Organic …, 2000
Effects of cetyltrimethylammonium bromide (CTABr) micelles on second-order rate constants (k nobs... more Effects of cetyltrimethylammonium bromide (CTABr) micelles on second-order rate constants (k nobs) for nucleophilic reactions of amines (piperidine and n-butylamine) with ionized phenyl salicylate (PS-) reveal a nonlinear decrease with the increase in [Dn](where [Dn]=[ ...
The Journal of Organic …, 2000
Effects of cetyltrimethylammonium bromide (CTABr) micelles on second-order rate constants (k nobs... more Effects of cetyltrimethylammonium bromide (CTABr) micelles on second-order rate constants (k nobs) for nucleophilic reactions of amines (piperidine and n-butylamine) with ionized phenyl salicylate (PS-) reveal a nonlinear decrease with the increase in [Dn](where [Dn]=[ ...
Colloids and Surfaces A-physicochemical and Engineering Aspects, 2000
Pseudo-first-order rate constants (kobs), obtained for the cleavage of ionized phenyl salicylate ... more Pseudo-first-order rate constants (kobs), obtained for the cleavage of ionized phenyl salicylate (PS−) at constant [NaOH]; [C6H5COONa]; [MeCN]; [CTABr]T (total concentration of cetyltrimethylammonium bromide) and varying concentrations of n-butylamine and piperidine ([Am]T), follow the relationship: kobs=k0+knobs[Am]T. The values of k0 and knobs at different [CTABr]T and [C6H5COONa] are explained in terms of pseudophase model of micelle coupled with an empirical
Colloids and Surfaces A-physicochemical and Engineering Aspects, 2000
Pseudo-first-order rate constants (kobs), obtained for the cleavage of ionized phenyl salicylate ... more Pseudo-first-order rate constants (kobs), obtained for the cleavage of ionized phenyl salicylate (PS−) at constant [NaOH]; [C6H5COONa]; [MeCN]; [CTABr]T (total concentration of cetyltrimethylammonium bromide) and varying concentrations of n-butylamine and piperidine ([Am]T), follow the relationship: kobs=k0+knobs[Am]T. The values of k0 and knobs at different [CTABr]T and [C6H5COONa] are explained in terms of pseudophase model of micelle coupled with an empirical
DOAJ (DOAJ: Directory of Open Access Journals), 2022
Automotive paint is frequently encountered as trace evidence in forensic investigation. Beside mi... more Automotive paint is frequently encountered as trace evidence in forensic investigation. Beside microscopic and instrumental examinations, frequency of occurrence data may help the investigator to assess the value of paint evidence. This study aimed to investigate the on the road automobile paint colour distribution in selected cities in Malaysia, namely Kuala Lumpur, Petaling Jaya, Shah Alam, Johor Bahru, Nilai, Kuala Terengganu and Kota Bharu. Out of 7,553 moving vehicles randomly sampled in the seven different locations, light grey, white and black were the top three colours, making up about 52% of the total car population. When the data from two cities, i.e. Kota Bharu dan Kuala Terengganu were compared to the survey conducted in 2011, there was significant difference at 95% significant level which indicated the dynamic distribution of Malaysian automotives. Hence, the information from this survey could support forensic opinion when the assessment on evidential value is requested.
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2000
Effects of cetyltrimethylammonium bromide (CTABr) micelles on second-order rate constants (kn obs... more Effects of cetyltrimethylammonium bromide (CTABr) micelles on second-order rate constants (kn obs) for the nucleophilic reactions of amines (n-butylamine, piperidine, and pyrrolidine) with ionized phenyl salicylate (PS-) reveal a decrease of nearly 4-fold for n-butylamine, 13-fold for piperidine, and 17-fold for pyrrolidine with an increase in [CTABr]T from 0.0 to 0.01 M at 35°C. These results show that the binding constants (KN) of amines with CTABr micelles vary in the order KN for n-butylamine > KN for piperidine > KN for pyrrolidine. The observed data are explained in terms of the pseudophase model of the micelle. The values of KN for n-butylamine, piperidine, and pyrrolidine turn out to be so small that they could not be determined kinetically. The significantly lower rate of aminolysis in the micellar pseudophase compared to that in the aqueous pseudophase is attributed to both micellar medium effect and different locations of amine and PSin the micellar pseudophase.
PLOS ONE
The topcoat color of motor vehicles offers vital information while investigating vehicular accide... more The topcoat color of motor vehicles offers vital information while investigating vehicular accidents, especially in instance of hit-and-run, since witnesses seldom perceive and retain the plate details. Differences in color perceptions among individuals with normal vision may lead to confusion in determining the color of the car involved. In this way, witnesses of crash accidents could potentially initiate flawed leads in forensic investigation, and thus affect the administration of justice. In this study, the inter-rater reliability of vehicle color determination by different volunteers was explored. Six individuals observed the topcoat colors of 500 stationary and 500 moving vehicles from five locations, employing a common system of color gradation. The outcome was binary: the vehicle color was either a "match" or "non-match". This was followed by statistical analysis in terms of the colors' frequencies and inter-rater reliability, based on which more suitable color descriptions were determined for subsequent comparisons of stationary and moving vehicles. Higher match frequencies and greater interrater reliability were observed when color gradations were disregarded. The frequency of correct matches could have been closely related to their relative on-the-road distribution, regardless of the statuses of observed vehicles. It was also found that black and white were associated with a greater number of matches than were intermediate colors, which should be carefully interpreted during forensic investigation to avoid wrong leads. In conclusion, the present study demonstrated the forensic significance of vehicle topcoat color determination, particularly in cases where witness statements are crucial.
The Journal of Organic …, 2000
Effects of cetyltrimethylammonium bromide (CTABr) micelles on second-order rate constants (k nobs... more Effects of cetyltrimethylammonium bromide (CTABr) micelles on second-order rate constants (k nobs) for nucleophilic reactions of amines (piperidine and n-butylamine) with ionized phenyl salicylate (PS-) reveal a nonlinear decrease with the increase in [Dn](where [Dn]=[ ...
The Journal of Organic …, 2000
Effects of cetyltrimethylammonium bromide (CTABr) micelles on second-order rate constants (k nobs... more Effects of cetyltrimethylammonium bromide (CTABr) micelles on second-order rate constants (k nobs) for nucleophilic reactions of amines (piperidine and n-butylamine) with ionized phenyl salicylate (PS-) reveal a nonlinear decrease with the increase in [Dn](where [Dn]=[ ...
Colloids and Surfaces A-physicochemical and Engineering Aspects, 2000
Pseudo-first-order rate constants (kobs), obtained for the cleavage of ionized phenyl salicylate ... more Pseudo-first-order rate constants (kobs), obtained for the cleavage of ionized phenyl salicylate (PS−) at constant [NaOH]; [C6H5COONa]; [MeCN]; [CTABr]T (total concentration of cetyltrimethylammonium bromide) and varying concentrations of n-butylamine and piperidine ([Am]T), follow the relationship: kobs=k0+knobs[Am]T. The values of k0 and knobs at different [CTABr]T and [C6H5COONa] are explained in terms of pseudophase model of micelle coupled with an empirical
Colloids and Surfaces A-physicochemical and Engineering Aspects, 2000
Pseudo-first-order rate constants (kobs), obtained for the cleavage of ionized phenyl salicylate ... more Pseudo-first-order rate constants (kobs), obtained for the cleavage of ionized phenyl salicylate (PS−) at constant [NaOH]; [C6H5COONa]; [MeCN]; [CTABr]T (total concentration of cetyltrimethylammonium bromide) and varying concentrations of n-butylamine and piperidine ([Am]T), follow the relationship: kobs=k0+knobs[Am]T. The values of k0 and knobs at different [CTABr]T and [C6H5COONa] are explained in terms of pseudophase model of micelle coupled with an empirical