International Journal of Research and Reviews in Applied Sciences
ISSN: 2076-734X, EISSN: 2076-7366

Volume 41 (October-December 2019)

To read and print the PDF files of the Journal Archive you will need to have Acrobat Reader 
 If you have any technical or content problems contact : publisher@arpapress.com

1. POTENTIAL CARCINOGENIC RISK FROM POLYCYCLIC AROMATIC HYDROCARBONS IN SELECTED SMOKED FISH SPECIES FROM A TYPICAL RURAL MARKET IN WEST AFRICA
by Wangboje Oiseoje Michael and Okpobo Joy
Abstract

The profile of polycyclic aromatic hydrocarbons (PAHs) in selected smoked fish species from a typical rural market in Nigeria, West Africa, was determined employing Gas Chromatographic technique, in order to evaluate potential carcinogenic risk on the unwary consuming public. The mean concentrations of the individual PAH congeners in specific fish species ranged from below quantification limit (BQL) for chrysene in Scomber scombrus and Trichurus lepturus to 8.822 µg/kg for indeno(1,2,3c-d)pyrene in Trachurus trachurus. Significant differences (p<0.05), were observed in the mean concentrations of all the PAH congeners in fish between months while no significant differences (p>0.05), were observed in the mean concentrations of pyrene, chrysene, benzo(k)fluoranthene, and benzo(a)anthracene, between fish species.   The estimated daily intake (EDI) values for PAHs in mg/person/day, ranged from 0.00005 for benzo(k)fluoranthene to 0.278 for indeno(1,2,3c-d)pyrene while the hazard quotient (HQ) values ranged from 0.004 for benzo(k)fluoranthene in the fish species to 17.64 for indeno(1,2,3c-d)pyrene in T. lepturus . The toxic equivalency (TEQ) values were generally dominated by benzo(a)pyrene, which peaked at 6.206 in T. lepturus. The cancer risk factors revealed that indeno(1,2,3,c-d)pyrene, benzo(b)fluoranthene, benzo(a)pyrene and benzo(a)anthracene presented critical values as they exceeded the United States Environmental Protection Agency (USEPA) cancer risk guideline value of 1.0 x 10-6. It was advocated that such fish should be consumed with caution in order to avert unwholesome carcinogenic health effects in the long run.

Source: International Journal of Research and Reviews in Applied Sciences
October - December (Vol. 41, Issue 1) - 2019

2. SOME NONLINEAR PARTIAL DIFFERENTIAL EQUATIONS OF INTEREST: EVOLUTION EQUATIONS AND THEIR PHYSICAL MEANING
by Alfred Huber
Abstract In this paper we perform an overview of some nonlinear partial differential equations (nPDEs) specifically evolution equations (EVs). With the help of nPDEs several processes in nature as well as economic, social, human medicine and technical sciences can be studied.
In opposite to linear equations the nonlinear version can not be classified exactly. Thus several special techniques are necessary to study initial values problems (IVP) and/or boundary condition (BVP) problems and eventually eigenvalue problems (EVP).
Also the qualitative behavior of solutions (more precisely classes of solutions) requires profound considerations. The structure of the paper is as follow: First we present some interesting nPDEs importantly in natural sciences. Then we develop some tools of functional analysis especially for existence and uniqueness. We further introduce terms like weak and/or strong convergence as well as weak and/or classical solutions. A further point of interest is the positivity and the long-time behavior of solutions.
A critical part will be the proofs; we try to perform them as clear as possible to ensure the physical and mathematical correctness. We find it useful to cite some original works of historical interest.
Source: International Journal of Research and Reviews in Applied Sciences
October - December (Vol. 41, Issue 1) - 2019

3. PROBABILISTIC LINEAR PROBLEMS WITH BIVARIATE EXPONENTIAL DISTRIBUTED RANDOM PARAMETERS
by Afaf El-Dash
Abstract In this paper, chance constrained programming (CCP) problems with some dependent exponential distributed random parameters are considered. Firstly, a suggested bivariate exponential distribution model is presented. This model is an important for financial, insurance, economical problems, etc. Secondly, a proposed method to convert (CCP) problems to the equivalent deterministic programming problems in two cases: (i) for individual constraints and some L.H.S. parameters a ̃ij follow a suggested model, (ii) for the joint (dividual) constraints and some R.H.S. random parameters b ̃i follow a suggested model also.
Source: International Journal of Research and Reviews in Applied Sciences
October - December (Vol. 41, Issue 1) - 2019