JBAS Articles
JBASV8N2A10 - Radiolysis of Commercial Dyes in Aqueous Solutions to Produce Dosimeters for Gamma Dosimetry
Journal of Basic and Applied Sciences - Volume 8 Number 2
Radiolysis of Commercial Dyes in Aqueous Solutions to Produce Dosimeters for Gamma Dosimetry
Taqmeem Hussain, Muhammad Yousuf Hussain, Muhammad Shahbaz, Inam-ul-Haq, Hashim Farooq and Shaukat Ali
http://dx.doi.org/10.6000/1927-5129.2012.08.02.10
Abstract: The usability of aqueous solutions of SR C4BLN and SGY CRL dyes; as secondary dosimeter was confirmed. All samples were irradiated by Co60 γ-source in the range 0-105Gy. Absorbance of solutions was noted at λmax for pre and post irradiation stages. The λmax of Red and Yellow dyes were 545nm and 448nm respectively. The absorbance% and the %discoloration of each dye were determined. Sample solutions showed a gradual decrease in Absorbance% and increase in %age discoloration versus absorbed doses.
Keywords: Chemical dosimeters, SR C4BLN, SGY CRL, dosimetry, Absorbance%, %age discoloration
JBASV8N2A9 - The Bi-Gamma ROC Curve in a Straightforward Manner
Journal of Basic and Applied Sciences - Volume 8 Number 2
The Bi-Gamma ROC Curve in a Straightforward Manner
Ehtesham Hussain
http://dx.doi.org/10.6000/1927-5129.2012.08.02.09
Abstract: In biomedical research, biomarkers (diagnostic tests) are used in distinguishing healthy and diseased populations. The effectiveness and accuracy of a biomarker generally assessed through the use of a Receiver Operating Characteristic (ROC) curve model, and its functional such as area under the curve (AUC). The parametric (smooth) ROC curves are obtained under the specific distributions assumptions. A resulting ROC curve model is the plot of sensitivity versus 1-specificity for all possible threshold values. Most popular and widely used ROC curve model is bi-normal ROC curve model under the assumptions of normality. When the biomarker results are continuous and positively skewed (non-normal). The gamma distribution is supposed to a flexible model for positively skewed measurements. In practice use of bi-gamma ROC curve model is hindered by the fact that ROC function cannot be written in closed-form.
The solution of the problem is to use transformed invariance property of ROC curve model. Which assumes that the test results of both diseased and healthy are normally distributed after some monotone transformation [1].
In this paper we propose a simple approximation solution for the problem mentioned in above lines using a normal approximation due to Wilson and Hilfertys [2]. Which is useful to approximate gamma distribution results with classical normal distribution based results.
Keywords: Sensitivity, Specificity, Receiver Operating Characteristic (ROC) curve, Normal distribution, Gamma distribution
JBASV8N2A8 - Experimental Study on the Morphology of Keratin Based Material for Asbestos Free Brake Pad
Journal of Basic and Applied Sciences - Volume 8 Number 2
Experimental Study on the Morphology of Keratin Based Material for Asbestos Free Brake Pad
O.S. Olokode, S.O. Fakolujo, P.O. Aiyedun, Z.O. Jaji, F.T. Owoeye and B.U. Anyanwu
http://dx.doi.org/10.6000/1927-5129.2012.08.02.08
Abstract: This research was carried out to investigate the friction and wear of automotive materials using a pad on disk type friction tester to study the synergistic effects of bagasse (residue from sugarcane) and cow hooves dust (keratin based material). The friction materials were based on a simple formulation with three ingredients (phenolic resin, cow hooves dust and bagasse). Friction stability, hardness, compressive strength, flame resistance and oil absorption were measured. Microscopic observation of the friction material showed that the cow hooves adhered to the bagasse providing heat resistance and strength to the friction film at the rubbing interface. The beneficial synergistic effect from the two fibrous ingredients however was significantly diminished when only one of them was employed.
Keywords: Hardness, compressive strength, cow hooves, Bagasse
JBASV8N2A7 - Heavy Protein Alteration under the Effects of Lead Acetate in Bactrocera cucurbitae
Journal of Basic and Applied Sciences - Volume 8 Number 2
Heavy Protein Alteration under the Effects of Lead Acetate in Bactrocera cucurbitae
Rizwanul Haq, M. Farhanullah Khan and Ehteshamul Haq
http://dx.doi.org/10.6000/1927-5129.2012.08.02.07
Abstract: Lead is supposed to be an important poisonous waste which could contaminate the environment, therefore, insects could be influenced easily by the lead., Bactrocera cucurbitae was studied at 48 hours post treatment, under the effects of lead acetate, in different concentrations of 0.125 mg., 0.25 mg., 0.5 mg, 1.0 mg and 2.0 mg. It was observed that under the effects of lead abnormalities and deformity were developed in the larvae of flies. Thus these flies could present a useful module for the quick transmission of the environmental hazards due to lead contamination, which exerts a specific physiological and morphological effect on these flies.
Keywords: Effects, Lead acetate, Proteins Bactrocera cucurbitae
