Open Access Original Research Article

Challenges and Resolution for Copper Wirebonding on Tapeless Leadframe Chip-on-Lead Technology

Antonio R. Sumagpang Jr, Frederick Ray I. Gomez

Journal of Engineering Research and Reports, Page 1-13
DOI: 10.9734/jerr/2018/v3i216869

This technical paper discusses a methodological and systematic way of resolving key challenges during introduction of Chip-On-Lead package specifically wirebonding issues that leads to production dilemma during production ramp-up of products using copper wire in tapeless leadframe. The project was intended to determine the “Red-X” or the major cause of yield detractors that may lead to quality issue during wirebonding process.

Problem solving tools were showcased in this paper such as Data Analysis, Cause and Effect, Design-of–Experiment (DOE) and mechanical dimensional analysis which provided substantial impact in determining the real root-cause of the problem. Step-by-step elimination of variables was achieved with the use of statistical engineering tools. Outcome of the project eliminated the occurrence of Non-Stick-On-Pad (NSOP) during wirebonding process without cost involved and just optimizing the available in-house resources.  The improvements also enhanced the quality of the product after final test which on the other hand lower the risk of having potential customer complaint in the future.

Open Access Original Research Article

A Fundamental Evaluation of the Municipal Solid Waste Management in Ado Ekiti, Nigeria, Using the Rating Index of the Users and Operatives

O. A. Oni, T. Omotoso, M. S. Awopetu

Journal of Engineering Research and Reports, Page 1-14
DOI: 10.9734/jerr/2018/v3i216870

The assessment of the management of the municipal solid waste (MSW) in Ado Ekiti being undertaken by Ekiti State Waste Management Board (ESWMB) was done using questionnaires distributed randomly to the users and government operatives of the service. The questionnaire responses were on a five-point scale, similar to the Likert’s scale, but not bipolar. The data was collected from the users of the main dumpsters, which are located at Opopogboro, Ajilosun, Atikonkon, Oja Oba and Odo Ado areas of the city. Also, the data from the operatives was collected from the driver and four labourers designated to collect waste from each dumpster. The people’s rating index (PRI), which was calculated from the weighted value of the responses to different questions, was used to determine the overall index value whose maximum value is 100. The rating was classified into five categories- bad, fair, fairly good, good, very good and excellent, to enable pragmatic assessment of each issue being assessed. The rating of the users varies from fair to fairly good while the rating of the operatives varies from fair to very good. The general better rating of the operatives compared to the users indicate the reason the state government is oblivious of the poor status of the management of the municipal solid waste (MSW) in Ado Ekiti. The findings in this study suggest that the state government needs to hold a stakeholders summit on effective management of MSW in Ado Ekiti. With this, critical issues relating to urgent need for improvement and increased funding from non-governmental organisations and the federal government will be resolved. In conclusion, the approach used in this study, which is not symmetrical and includes the perception of primary stakeholders appears to be pragmatic and suitable for foundational appraisal of the management of a basic MSW system.

Open Access Original Research Article

A Computerized Boundary Element Algorithm for Modeling and Optimization of Complex Magneto-Thermoelastic Problems in MFGA Structures

Mohamed Abdelsabour Fahmy, Saleh M. Al-Harbi, Badr Hamedy Al-Harbi, Alanod M. Sibih

Journal of Engineering Research and Reports, Page 1-13
DOI: 10.9734/jerr/2018/v3i216872

Aims: The aim of this article is to propose a boundary integral equation algorithm for modeling and optimization of magneto-thermoelastic problems in multilayered functionally graded anisotropic (MFGA) structures.

Study Design:  Original research paper.

Place and Duration of Study: Jamoum laboratory, January 2018.

Methodology: a new dual reciprocity boundary element algorithm was implemented for solving the governing equations of magneto-thermoelastic problems in MFGA structures.

Results: A numerical results demonstrate validity, accuracy, and efficiency of the presented technique.

Conclusion: Our results thus confirm the validity, accuracy, and efficiency of the proposed technique. It is noted that the obtained dual reciprocity boundary element method (DRBEM) results are more accurate than the FEM results, the DRBEM is more efficient and easy to use than FEM because it only needs the boundary of the domain needs to be discretized.

Open Access Original Research Article

Development of a Preconditioning System for FUTA Floating Fish Feed Extruder

A. P. Olalusi, C. F. Nwaeche, A. Adesina

Journal of Engineering Research and Reports, Page 1-10
DOI: 10.9734/jerr/2018/v3i216873

The need to enhance the quality of fish feed produced in Nigeria was the major consideration in the design and development of a preconditioning system. The machine consists of two insulated cylindrical barrels, set of arranged paddles on a shaft, frame, hot water and feed mash inlet, discharge chute, chain and sprocket. It was powered by a three-phase 15 hp electric motor which transmits power to the machines shaft and set of paddles via chain and sprocket. The performance characteristics of the machine; mixing efficiency and throughput capacity were evaluated using Nigerian Institute for Oceanography and Marine Research (NIOMR) feed formulation at feed mash particle sizes of 900 µm, 550 µm, 520 µm and paired paddle rotating speed of the lower and upper chamber at (96.8; 145.2), (122.6; 183.2) and (174.5; 260.8) rpm respectively. The throughput capacity of the preconditioner is 650 kg/hr. The results showed increase in temperature and moisture content level of the particles as the machine speed decreases. The optimum mixing efficiency that gave best uniformity of mix was attained when Paired paddle speeds were (96.8; 145.2), (122.6; 183.2) with an average Biot numbers of 0.1.

Open Access Review Article

Effect of Tillage Speed, Depth, Ballast Weight and Tire Inflation Pressure on the Fuel Consumption of the Agricultural Tractor: A Review

Amer M. Mamkagh

Journal of Engineering Research and Reports, Page 1-7
DOI: 10.9734/jerr/2018/v3i216871

Tillage is a very important practice in agriculture in many countries and accounts for more traction energy than any other field operation. Tillage operation consumes up to 59% of all diesel fuel required for the complete technology so reduced tractor fuel consumption during tillage will result in both environmental and agricultural economic benefits.

Several attempts have been made to study the fuel consumption of the agricultural tractor in order to minimize it to acceptable levels during the tillage operations. Some factors like tillage speed, depth, ballast weight and tires inflation pressure of the tractor can affect the tractor fuel consumption. This article reviews these factors to give possibility for further research to focus on the potential solutions to decrease the fuel consumption of the agricultural tractors.