Browsing by Author "Asif Nadeem"

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    A first-principles study of spinel compounds for optoelectronics and thermoelectric applications
    (UMT, Lahore, 2023) Asif Nadeem
    In this thesis, the optical properties and electronic structure approximation have been discussed comprehensively via implementing Density Functional Theory (DFT). Advancements in optical devices and telecommunication have increased the demand for composition with high optical coefficients. For this, several items with appropriate optical properties have been developed, some of which are based on the family of spinel compounds. Their flexibility in various construction and structure allows for the adjustment of their visual structures. Lithium ion battery has gained popularity due to the suitability of many technological applications. Recently, the LiMn2O4material has been used widely due to their improved optoelectronic properties. Spinel Compounds have potential applications in electrical and optoelectronics fields. We explore the optical and electronic properties of Li1-xNixMn2O4 where (x= 0.04 % and 0.08%) are calculated through first-principle method based on the approximation known as the GGA+U, where U is the Hubbard parameter. The generalized gradient approximation (GGA) and local density approximation (LDA) do not treat properly the transition metal. Therefore we have used the GGA+U. The band gap dependent optical characteristics such as dielectric constant, optical conductivity, refractive index and reflectivity are calculated and examined. The substitution of the cation is examined and investigated for the studied compound and a prominent change is noticed. The reinforcement of the cation percentage of Ni decreases the band-gap and its dependent optical characteristics. In different regions of the spectrum for device fabrication this alteration is highly recommended.
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    Genetic analysis of the saraiki population living in Pakistan.
    (Taylor&Francis, 2016) Noman Rasool; Asif Nadeem
    Autosomal short tandem repeat (STR) markers are a powerful tool used in forensic sciences for profile matching and paternity testing, sibship and kinship analysis. This study represents the allele frequency distribution of 15 autosomal STR multiplex of the Saraiki population living in Pakistan. Allele frequencies of this population were compared with the other populations living in Pakistan. Buccal swabs were taken from 150 unrelated individuals of the Saraiki population living in different regions of Pakistan and profiles were generated using an AmpFlSTR Identifiler PCR Amplification kit. Population genetic calculations were performed on this population. Allele frequencies of the Saraiki population showed that this population is at Hardy Weinberg Equilibrium except at loci D3S1358, TH01, D13S317, TPOX and FGA, with distinct differences in HObs and HExp values. The average heterozygosity and polymorphism information content (PIC) at all loci were 0.77 and 0.766, respectively. Each STR marker showed a high degree of polymorphism and a high power of discrimination (PD). A phylogenetic tree shows that the Saraiki population living in Pakistan is genetically distinct from other geographically neighboring populations of the country. The population data presented in this study can be used as a reference database for the Saraiki population in forensic casework