Archives-October 2021

In this article, we are analysing the arrangements of atoms and charge distribution by using optimized geometry of 2,7-Bis(4-Methoxyphenyl) 9,9-Dipropyl-9H-Flurene (Exalite-389), which has been obtained by DFT study. The solvent effect on the molecular orbitals has been investigated by studying parameters like chemical hardness (?), chemical potential (?) and global electrophilicity (?) of the Exalite–389 molecule in vacuum and solvent medium. These outcomes provide a deep understanding of structure of the molecule and electronic properties in different mediums characteristics for optoelectronic applications.

This study presents the impact of dust on the electrical performance parameters of CIGS PV modules installed in a Sahelian environment. The study concerns two PV (photovoltaic) modules of the same technologies (CIGS), of the same power, (90W) each, of the same electrical parameters and manufactured by the same company. These modules, respectively denoted M1 (SN-CIGS90) and M2 (SN-CIGS90) were tested under the initial conditions to ensure their correct operation and to determine the initial values of the electrical parameters before exposure. After that, the modules are exposed under actual CERER operating conditions for three months, in which the module M1 undergoes weekly cleaning and M2 is exposed without cleaning for three months. The comparison of the variation rates obtained on the experimental values of the two modules shows that, like other technologies, the deposition of dust constituting the environmental constraint that most influences the electrical parameters of a CIGS module. In fact, the M2, has respective variation rates of -38,581% for the maximum power (Pmax) and -37,430% for the short-circuit current (Isc), +1.520% for the open circuit voltage and (Vco) -3.309% for the form factor (FF), unlike the M1 module, which undergoes the following variations: -7.5% for the Pmax -3.163% for the Isc, + 1.467% for the Vco and-5,861% for the FF.

The study examines the Influence of Group Discussion Technique on Students’ Academic Performance in Economics in Senior Secondary Schools in Calabar Municipality, Cross River State. To achieve the purpose of the study, one null hypothesis was tested at 0.05 level of significance. The survey research design was adopted for the study. A sample size of two hundred (200) respondents was randomly selected for the study. The “Examining the Influence of Group Discussion Questionnaire” (EIGDQ)”, and “Achievement Test in Economics” (ATE) werethe instruments used to collect data for the study. The statistical tool used to analyze the data was Independent t-test statistical analysis. The findings of the study affirmed that group discussion significantly influences students’ academic performance in Economics in Calabar Municipality. Based on the findings of the study, it was recommended among others that: teachers should be trained and retrained on the effective use of group discussion in the teaching of Economics,Curriculum planners should incorporate group discussion technique into economics curriculumof senior secondary school to enable teachers utilize them in teaching Economics, Economics teachers should be given easy access to capacity building programme through workshop, conference, seminar, symposia and exhibition on group discussion technique to enable them learn how to effectively apply this technique when teaching Economics, space and the needed instructional aids should be provided to enable teachers and students to adopt this instructional delivery technique.

Table of contents for the month of October 2021