Open Access Method Article

Modeling and Assessing Nailing Conduct Utilizing FEM Method

Siamak Davoudinezhad

Journal of Engineering Research and Reports, Page 25-40
DOI: 10.9734/jerr/2020/v19i117223

The nailing method is utilized for temporary and permanent stabilization of the drilled excavations and walls. In most instances, nailing is much more cost-efficient than other excavation stabilization alternatives, hence the popularity and rapid development of nailing technology have been increased. In this research, several parameters such as changes in the height of the excavation, alterations in the soil environmental parameters, changes in the nails’ layouts, and their lengths were analyzed to evaluate the conduct of the nailing system. The findings of this study demonstrated that each of the mentioned parameters makes changes in the locations, and the forces of the system. Further examination of the impact of each parameter, the maximum and minimum impact of the changes are assessed and ultimately, a general insight is created for designing each constituent of this study.

Open Access Original Research Article

Relationship between Worship Time and Attendance in Orthodox Church, Southern Nigeria

O. C. Ezeanyim, C. O. Nwankwo, A. O. Umeozokwere

Journal of Engineering Research and Reports, Page 6-12
DOI: 10.9734/jerr/2020/v19i117220

The perturbation in members worship attendance data with respect to service duration and a general impression among members, that worship attendance recorded at sessional services, was due to the worship duration, gave rise to this investigative research. There has never been a study in this relation of worship time and members attendance in the church.  This study therefore seeks to clarify thinking, in the service time and attendance relationships among the worshipers. To satisfy the needs of the relationships, a correlation analysis was conducted using available data from 62weekly service observations for an orthodox church in south-south Nigeria, by applying parametric and nonparametric correlation methods. The correlations coefficient were obtained by using the Pearson, Kendall and Spearman correlation methods which showed 63, 53 and 66% correlations respectively as well as a significant value of 0.000 result for each individual methods. The results show that there is a significant relationship that exists between both variables under consideration.  This insightful and informative research outcome will disabuse or soothe the minds of these members as well as guide the church leadership’s poise in membership growth, development and management of gospel dissemination across sub-Saharan Africa.

Open Access Original Research Article

Design of Fundamental Power Coupler of 5 Cell Elliptical SRF Cavity Using CST Microwave Studio

Rajdip Das, B. N. Biswas

Journal of Engineering Research and Reports, Page 13-24
DOI: 10.9734/jerr/2020/v19i117221

A 5 cell elliptical cavity prototype has been build to accelerate the 100 MeV high beam of protons [1]. For cavity = 0.61 β g at 650 MHz in which the cavity structure is optimized by using the code from SUPERFISH [2]. The Q value of the cavity measured is 0.61x109 for 4.2 K. In the frequency range 2 – 5 GHz with CST MICROWAVE STUDIO [3]. It has been designed taking into account the advantages of both the waveguide type and coaxial type coupler This paper explains the current design of the cavity with a different angle of aperture and wall which have better mechanical stability and flatness, consisting of facilities for surface processing and less loss of beam. In this paper, the fundamental power coupler of a 5-cell 650MHz elliptical SRF cavity has been designed using CST MICROWAVE STUDIO. Here we have considered the ceramic window matching and co-axial to rectangular waveguide matching for the power coupler.

Open Access Original Research Article

Package Reliability Performance Study of QFN Device on Different Die Attach Machines

Edwin Graycochea Jr., Rennier Rodriguez, Frederick Ray Gomez, Bryan Christian Bacquian

Journal of Engineering Research and Reports, Page 41-43
DOI: 10.9734/jerr/2020/v19i117224

The paper is focused on the reliability performance of quad-flat no-leads (QFN) package evaluated on different die attach machine platforms. Reliability tests were done to check the difference in the quality and reliability performance of the device that undergone die attach process on two different machines. Thermal cycling resulted in significant difference on the two machines, with the device processed in Machine 1 showing reliability failures while on Machine 2 it passed the 1000 thermal cycle. For future works, Machine 2 could be used for devices with critical package reliability requirement.

Open Access Review Article

Hydraulic Fracture Geometry Modeling Techniques for Extracting Unconventional Reservoirs

Mohamed Ali Khalil, Abdunaser Omar Susi

Journal of Engineering Research and Reports, Page 1-5
DOI: 10.9734/jerr/2020/v19i117219

This study aims to provide a comprehensive review of all hydraulic fracture geometry modeling techniques available in the conventional and unconventional reservoirs. We are introducing a comparison study between major available hydraulic fracture modeling techniques, advantages, and disadvantages of each one according to the latest related studies. The study includes the three general families of models: 2D models, pseudo-3D models, and fully 3D models. Consequently, the results of this work can be used for selecting the proper model to simulate or stimulate the reservoir to enhance oil recovery using hydraulic fracturing. Also, these results can be used for any future updates related to hydraulic fracturing stimulation based on the comparisons that were conducted.