Higher College of Technology

About: Higher College of Technology is a based out in . It is known for research contribution in the topics: Computer science & Higher education. The organization has 369 authors who have published 379 publications receiving 729 citations.

Mathematical Analysis of an Industrial HIV/AIDS Model that Incorporates Carefree Attitude Towards Sex.

Abstract: A nonlinear differential equation model is proposed to study the dynamics of HIV/AIDS and its effects on workforce productivity. The disease-free equilibrium point of the model is shown to be locally asymptotically stable when the associated basic reproduction number [Formula: see text] is less than unity. The model is also shown to exhibit multiple endemic states for some parameter values when [Formula: see text] and [Formula: see text]. Global asymptotic stability of the disease-free equilibrium is guaranteed only when the fractions of the Susceptible subclass populations are within some bounds. Optimal control analysis of the model revealed that the most cost effective strategy that should be adopted in the fight against HIV/AIDS spread within the workforce is one that seeks to prevent infections and the treatment of infected individuals.

Exploring the potential of Eucalyptus citriodora biochar against direct red 31 dye and its phytotoxicity assessment

Abstract: The feasibility of using Eucalyptus citriodora leaves (ECL), an abundantly available agricultural waste, for adsorption of an anionic dye, direct red 31 (DR31), adsorption from hydrous solution has been examined in the present research. The batch adsorption trials were performed to analyse the effects of pH, contact time, initial dye concentration, adsorbent dose, temperature and particle size on DR31 removal from its aqueous solution on biochar of ECL. A maximum of 97% removal of DR31 dye was observed at pH and initial adsorbate concentration of 2 and 40 mg/L by the ECL biochar, respectively. Equilibrium data were examined by Langmuir and Freundlich isotherms. Langmuir isotherm appeared as the best fit model with the highest adsorption capacity of 3.2 mg/g. The kinetic results were also examined and found pseudo-second-order to be the best fit which expressed that the adsorption rate was mainly regulated by chemisorption. ECL biochar maintained > 41.56% adsorption capacity of DR31 dye even after five adsorption–desorption consecutive cycles. Phytotoxicity studies on Vigna radiata substantiated the non-toxic nature of the treated DR31 dye-containing water. The present study reveals that the biochar of ECL can be utilized as a cost-effective adsorbent to make the dye-contaminated wastewater reusable.

On Existence of Sequences of Weak Solutions of Fractional Systems with Lipschitz Nonlinearity

Abstract: In this article, the variational method together with two control parameters is used for introducing the proof for the existence of infinitely many solutions for a new class of perturbed nonlinear system having - Laplacian fractional-order differentiation.