The present paper aimed to investigate the analysis of quality losses in the manufacturing process of 50 cl R/Spirit bottles using Statistical Quality Control method. The analysis covered the factors that affect the quality of the glass bottles and how the production process can be optimized to minimize defects. The data obtained from our investigation hub for 13 days was successfully analyzed using quality control charts and Taguchi quality loss function. The Taguchi quality loss function was successfully employed to calculate quality loss. The loss incurred due to defects was N25, 636.84. Results obtained from chart and chart showed that the manufacturing process was out of control as some points fell outside the control limits. The possible causes of variations were identified and eliminated. This led to a reduction in the number of defective bottles produced per batch of production. The common causes of defects and deviations from target values were due to imperfection in the production process, traceable to the operators, machine and inappropriate proportion of raw materials.
The Structural, electronic and elastic properties of mono and dihydrides of Palladium were investigated by using first-principles calculation based on density functional theory as implemented in the Vienna ab-initio simulation package. It was revealed that the calculated lattice parameters were in agreement with the experimental results. A pressure-induced structural phase transition from ZB to NaCl was observed at a pressure of 11 GPa for PdH. A high superconducting transition temperature (Tc) of 18.76 K was obtained for PdH2.
This research investigates the potential of manufacturing composite materials combining good mechanical and thermal insulation characteristics using C&D wastes (Construction and Demolition waste) in substitution of raw aggregates. Unsaturated polyester matrix composites encapsulating C&D waste of 300 μm and 500 μm as additives, at concentrations of 30%, 40% and 50 (% w/w) respectively, were manufactured. The effects of loading these materials with C&D wastes, in terms of mechanical and thermo-insulating performance were studied. Experimental research revealed the strong interrelation between the mechanical performance of materials and parameters such as grain size and concentration of loading agent. In particular, composites encapsulating 300 μm additives demonstrated improved flexural and shear properties, taking values of 34.59 MPa (30% additives), 35.61 MPa (40% additives) and 30.25 MPa (50% additives) for flexural strength and 3.72 MPa (30% additives), 4.18 MPa (40% additives) and 2.66 MPa (50% additives) for shear strength, compared to corresponding 500 μm loaded composites which flexural strength reached 33.58 MPa (30% additives), 34.6 MPa (40% additives) and 27.47 MPa (50% additives). Similarly shear strength reached 2.81 MPa (30% additives), 3.87 MPa (40% additives) and 2.5 MPa (50% additives) respectively. Composite materials loaded at a concentration of 40% (w/w) using 300 μm C&D waste additives, exhibited optimal mechanical efficiency in terms of flexural and shear strength. Thermo-insulating properties of optimum, in terms of mechanical behavior, composite materials were afterwards investigated. Thermal insulation efficiency was determined by measurement of thermal conductivity coefficient (λ) which was calculated at 0.039 W m-1 K-1, lying within the range of values referred in literature for common insulation materials (0.035-0.16 W m-1 K-1). In conclusion, the characteristic attribute of these materials to exhibit adequate mechanical and thermal insulation properties, as validated by the experimental results, indicates their suitability as building and insulation materials in construction applications.
Application of response surface methodology in zeolite synthesis from ugwaka clay has been demonstrated. In this study, optimization of synthetic zeolite production was carried out. Process variables such as reaction time, sodium hydroxide concentration, and calcination temperature were optimized using Box-Behnken design. Raw ugwaka clay was treated with distilled water and sodium hexametaphosphate to remove the impurities usually associated with natural clay and induce sedimentation. The clay undergoes metakaolinization at 700 for 2hours. X-ray Florescence (XRF), Fourier Transform Infrared (FTIR) and Scanning Electron Microscope (SEM) were used in sample characterization. XRF analysis of raw ugwaka clay gave silica-alumina ratio of 1.705 which falls within the specifications for the synthesis of zeolite. The reaction time, sodium hydroxide concentration and calcination temperature were varied between 1.5-2.5 hours, 600-900 and 1-4M respectively. A quadratic model was developed and was used for the prediction of zeolite yield. Optimization of the process resulted in the reaction time of 2 hours, sodium hydroxide concentration of 2.5 M, and calcination temperature of 800 . Optimum conditions were validated at the model desirability of 1. The experimental value of 92.03wt% yield of zeolite with 0.895% error was obtained. Comparison of the zeolite produced with commercially available zeolite showed that it has good properties to be used in water treatment.
The charging/discharging rate capability of Si anodes with record areal Li storage capacity has been improved by increasing their conductivity. The anodes consist of an array of Si microwires of about 1.2 µm in diameter, embedded in Cu at one end. The conductivity of the anodes has been enhanced by chemically depositing a thin layer of Cu particles on the walls of the Si wires. The enhancement of the conductivity has been evidenced by analyzing the curves of Li storage capacity versus cycle number.