Natural & Applied Sciences

Natural & Applied Sciences Research Papers/Topics

Biology of Bactrocera dorsalis (DIPTERA: TEPHRITIDAE): implications on population dynamics and pest management

Abstract: Fruit production is one of the fastest growing sectors in Botswana. As one of the agricultural sectors, fruit production is very crucial as it contributes immensely towards income generation and employment opportunities, especially for vulnerable rural livelihoods. Despite all the benefits, one of the biggest hurdles in the fruit production industry is disease and insect pests. Chief among these insect pests is the Bactrocera dorsalis (Hendel) (Diptera: Tephritidae). Bactrocera dor...

Heat Transfer Analysis of a Parabolic Trough Collector Prototype under Botswana`s Terrestrial Conditions

Abstract: Botswana has about 84 % of its land area as part of the semi-arid Kalahari desert and it experiences over 320 clear sky days per annum, with a solar insolation of 21 MJ/m2 per day on a horizontal flat surface. This favors energy generation using concentrated solar thermal technologies, especially parabolic trough collector (PTC). PTC is the most mature technology and contributes up to about 90 % of installed concentrated solar thermal power in the world. A PTC prototype was fabrica...

Security of quantum key distribution and quantum state sharing

Abstract: Quantum key distribution (QKD) and quantum secret sharing play a pivotal role in securing con dential information. QKD allows legitimate parties to create a cryptographic key which they can use to communicate privately without being intercepted by a malicious eavesdropper. QKD exploits the laws of quantum mechanics such as the Heisenberg uncertainty principle, the no cloning theorem and the principle of entanglement to detect any eavesdropper who tries to gain the knowledge of the ...

Photocatalytic and antibacterial properties of Ag/ZnO/NC nanocomposite

Abstract: Recently, organic and inorganic pollutants including heavy metals, effluents, dyes, and bacteria have been removed from wastewater and other environmental settings using nanomaterials. Combining two or more nanomaterials to form nanocomposites offers improved and tailored properties for these applications. Metal-polymer nanocomposite exhibit elevated optical, electrical, thermal and mechanical properties, which make them interesting candidates for the manufacturing of functional de...

Marginal facies and compositional equivalents of Bushveld Parental sills from the Molopo farms complex layered intrusion, Botswana: petrogenetic and mineralization implications

Abstract: Parental magma composition to layered ultramafic to mafic intrusions are commonly studied using rocks occurring along their contact with the surrounding country rock. These include sills, dykes and/or rare chill margins. In comparison to the well-studied ~2.05 Ga Bushveld Complex layered intrusion, no study is available on the parental magma composition of the Molopo Farms Complex layered intrusion in southern Botswana. With a size, approximately 1/3rd of the Bushveld Complex, mafi...

A novel molecularly imprinted polymer for the selective removal of interfering hemoglobin prior to whole blood analysis

Abstract: A novel, selective, sensitive, cheap and robust hemoglobin imprinted polymer (Hb-MIP) in the form of a powder, was synthesised through bulk, free-radical polymerization employing molecular imprinting technology (MIT), for the selective removal of interfering hemoglobin from whole blood samples prior to instrumental analysis in molecular diagnostics and toxicological assays. Following solid phase extraction clean-up through batch rebinding experiments, the Hb-MIP powder effectively ...

Investigation of Lotsane earth fill dam for internal defects using time-lapse electrical resistivity imaging and frequency domain electromagnetic methods

Abstract: Internal erosion and development of seepage pathways is an ever present concern in earth fill dams, and are a major reason for many dam failures. Internal erosional progresses that are responsible for many dam failures are usually difficult to detect at their onset using the currently in-built monitoring systems that are installed during dam construction. Importantly, increased seepage in dams can only be observed after manifesting at the surface, at which time the integrity of the...

Diversity and distribution of Lepidopteran Stemborers and their natural enemies in Botswana

Abstract: Botswana is a country which depends mainly on cereal agriculture, done mostly by rural farmers as their major income stream. However, lepidopteran stemborers are a major constraint in the rural farmers’ cultivation of cereal crops. Species diversity and distribution of these insects of economic concern is currently unknown in Botswana. Through a survey, I catalogued the diversity of stemborers, host plant interactions and their associated parasitoids across Botswana. A total of 1...

The exponentiated generalized power series: family of distributions: theory, properties and applications

Abstract: We propose a new generalized family of distributions called the exponentiated generalized power series (EGPS) family of distributions and study its sub-model, the exponentiated generalized logarithmic (EGL) class of distributions, in detail. The structural properties of the new model (EGPS) and its sub-model (EGL) distribution including moments, order statistics, Rényi entropy, and maximum likelihood estimates are derived. We used the method of maximum likelihood to estimate the p...

The complete mitogenome of an undescribed clam shrimp of the genus Gondwanalimnadia(Branchiopoda: Spinicaudata), from a temporary wetland in Central District, Botswana

Abstract: Clam shrimps (Spinicaudata) are a widespread and diverse crustacean group that frequent temporary aquatic habitats, but few complete mitochondrial genomes have been published for this group. Here,we report the mitogenome of an undescribed Gondwanalimnadia species from Botswana. Raw sequences were assembled into a single circular genome with a total length of 15,663bp. Thirteen protein-coding genes, 22 tRNAs, and 2 rRNAs were identified using the MITOS pipeline. The mitogenome’s G...

Convergence theorems for a fixed point of η-demimetric mappings in banach spaces

Abstract: The purpose of this paper is to propose and investigate an algorithm for solving a fixed point of η-demimetric mappings. We establish the strong convergence of the proposed algorithm under some mild conditions in Banach spaces. We apply these results to obtain new strong convergence theorems which are connected with the η-demimetric fixed point problems in Hilber/Banach spaces.

Probing quantum gravity through astrophysical observations

Abstract: This work is primarily focused on probing quantum gravity through astrophysical observations based on the theoretical framework of the Nexus Paradigm of quantum gravity. The Nexus Paradigm is a theoretical framework that is still in development and offers a different approach to the problem of quantum theory of gravity. In this framework gravity, Dark Energy (DE) and Dark Matter (DM) are seen as different manifestations of the quantum gravity. Astrophysical observations offer a...

Quaternary megapaleolake system in Northwest Botswana: evidence of Lacustrine deposition and geographical extent using multiple geochemical proxies

Abstract: Reconstruction of climate dynamics in southern Africa has been immensely constrained by the absence of continuous proxies records. Sediments provide potential sources of studying past environments because their makeup is a direct response to variabilities in the environment and climate. In this study a multiple geochemical proxy approach was used to investigate two 30 m deep sediments cores from northern Botswana to construe their various geological processes and environments ...

Delineation of potential gold mineralization zones in Phitshane Molopo area Southeast Botswana using induced polarization and resistivity measurements

Abstract: An integrated geophysical approach (using induced polarization together with resistivity) geophysical techniques was applied in the research area (Phitshane Molopo area, Botswana) in search for potential gold mineralization from the interpreted data to delineate potential sites for mineralization. Reports on historic exploration suggest that gold mineralization is associated with quartz ± carbonate veins that cut across the banded iron formations. The 2D IP/ERI measurements w...

Estimation of uncertainty on pH measurement results: a direct pathway to quality assurance

Abstract: A technique for estimation of measurement uncertainty of routine pH measurement using pH meters; Thermo scientific Orion Star and Basic 20 is presented. There are issues associated with pH measurements, what we actually measure is not usually what we would expect or even intend, and it is common practice that analysts just take the immediate reading without doing repetitions. The pH measurements made from one chemical laboratory are not consistent with those made in a differen...


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