Physical Sciences and Engineering

Oil was extracted from tiger nut (Cyperus esculentus) tubers at a percentage oil yield of 4.72% using Soxhlet extraction method. The extracted oil was characterized using Gas Chromatography Flame Ionization Detector (GC-FID) and a fatty acid percentage composition of 35.69%, 20.78%, 18.03%, 14.25%, 9.35%, and 1.90% of Oleic acid, Linolenic acid, Lauric acid, Myristic acid, Linoleic acid and Eicosapentaenoic acid respectively was obtained, giving a total percentage fatty acid composition of 100%.

Sustainable agriculture performs a significant part in agroecosystems and decline destructive consequences at the environment through making use of multiple natural processes. Optimum soil fertility is a crucial purpose to be executed in sustainable agriculture system. Arbuscular mycorrhizal fungi (AMF) execute an environmental-friendly way to accomplish the previous objectives. Most of the terrestrial plant species are associated with the AMF and they have a necessary mutualistic link with plants.

Aim & In this paper, we introduce the third system which is called the category of natural deduction (CND) for language propositional logic system(LPLS), it's essential different in its form and ways form truth -table and truth-tree for (LPLS), even itspick out (or select) the same symbolic language like that used in the system of truth-table and truth- tree for (LPLS).

Nigeria he interest in biometric technology is received much attention in the recent years. However, the security issue still persists the main challenge for the reliable functioning of biometric authentication systems (BAS). Much academic research has been reported on the vulnerabilities of biometric systems that breach the se-curity and user privacy in mobile devices. We present a high-level classication of taxonomy of attacks against BAS and discuss the severity of attacks on the BAS for mobile computing device.

Made n- and p-type Si0.7Ge0.3 thermoelectric alloys and their thermoelectric characteristics are studied. These alloys are cut into profiled plates, monolithic packages are assembled from them, switching plates are glued to the lower and upper bases of the packages, commutated packages are cut into 4-5 mm thick plates and monolithic thermoelectric modules are assembled from them. Electrical insulation nodes of thermoelectric modules are made on the basis of AlN and graphite plates. These nodes are connected to modules, resulting in monolithic samples.

An experimental study was carried out on an indirect solar dryer operating with natural convection. The study focused on the behavior of three parameters over time. Solar radiation at the measurement site, the temperature of various elements of the collector and of the air at four precise locations inside the dryer, and the velocity at its outlet were measured. The results of the five-day average measurements showed that the solar dryer has a uniform temperature profile inside the drying chamber.

The study was conducted to evaluate the psychometric properties of the Bengali version of the Multidimensional Students’ Life Satisfaction Scale (MSLSS: Huebner, 1994) within a sample of 576 Bengali school-going adolescents in grades 9 to10. The first objective was to determine the construct validity of the MSLSS with school-going adolescents using exploratory factor analysis (EFA). Eight items were eliminated during the factor analysis. The results clearly support the five-factor structure as a replication of Huebner’s five-factor model.

The study aims to investigate the ability of biological treatment of raw tannery effluent by using Pongamia glabra bark powder to decolourize tannery wastewater contaminants in terms of heavy metal removal capacity and efficiency and to check their ability to decolorize and to degrade the toxic chemical components of the tannery effluent at various concentration and pH.

The evaluation of the material strength of concrete over time is a significant concern in many civil engineering construction projects. Several reference documents, including BAEL 91, provide formulas to estimate the compressive strength of concrete at J days based on the strength measurements obtained at 7 days. However, noticeable differences exist between the estimated values and the actual values obtained during construction when applying these formulas.

The routing protocol of nodes in RPL networks will now use a safe blockchain-based authentication system, according to this study. The Ethereum blockchain and smart contracts are used in the suggested approach to address the security issues, notably Decreased Rank At-tack in RPL network topology. The background of RPL, IoT-LLNs, and blockchain technology is covered in the study, along with the suggested methodology and its application. The study also assesses the performance of the suggested remedy and contrasts it with current approaches.