Journal of Brilliant Engineering (BEN)

M. Selim Çöğenli Ayşe Bayrakçeken Yurtcan

The oxidation of small organic molecules on the catalyst under electrocatalytic conditions is important for the operation of liquid feed fuel cells. The basic reaction mechanisms toward the oxidation of methanol and formic acid continue to be a matter of debate under real operational conditions of electrochemical systems. The electrocatalytic activity of the commercial Pt/C catalyst was investigated in sulfuric acid/methanol and sulfuric acid/formic acid mixtures using electrochemical measurements. This work presents the variation of formic acid and methanol oxidation on the catalyst depending on hydrodynamic conditions using the rotating disk electrode. Cyclic voltammograms were obtained at different scan rates, rotating speeds and concentrations. As the rotating speed increases, the oxidation activity of formic acid and methanol decrease under voltammetric measurements. The peak currents of formic acid and methanol oxidation increased with the increase in the scan rate and concentration.

https://doi.org/10.36937/ben.2020.002.001

Emin Argun Oral Nida Kumbasar Aslı Nur Ömeroğlu İbrahim Yücel Özbek

This study proposes a new dataset of high resolution satellite images of hangars located at airports. It contains one thousand pictures obtained from Google Earth with different heights and angles. The detection of hangars is a challenging problem as the dataset contains camouflaged and non-camouflaged targets in different sizes. Mask R-CNN, regional based, and YOLOv2, regression based, algorithms were used in the detection problem. Mask R-CNN enables instance segmentation with a bounding box. YOLOv2, on the other hand, is used in real-time applications and provides only a bounding box. The object detection accuracy obtained by using Mask R-CNN and YOLOv2 algorithms to detect different sized objects was obtained as %72 and% 74, respectively.

https://doi.org/10.36937/ben.2020.002.002

Osman Hamdy Osman Shallan Hassan M. Maaly

This paper performs optimization for plane steel frames with semi-rigid beam-to-column connections, in a company with fixed, semi-rigid and hinged base connections using a biogeography-based optimization algorithm (BBO), along with a genetic algorithm (GA). In this paper, Kanvinde and Grilli [1] nonlinear model is used for simulating semi-rigid base connections, where this model considers all deformations in different base connection components under the applied loads to determine the relative spring rotation θr for the sake of getting accurate base rotational stiffness value. In addition, Frye and Morris [2] nonlinear model is used for simulating semi-rigid beam-to-column connections. The P-∆ effect and geometric nonlinearity are considered. The stress and displacement constraints of AISC-LRFD [3] specifications, together with size adjustment constraints, are considered in the design procedure.

https://doi.org/10.36937/ben.2020.002.003

Taha Alper YILMAZ Ayşenur KELEŞ Güzide Meltem Lüle ŞENÖZ Yaşar TOTİK İhsan EFEOĞLU

AA7075 Al alloys are widely used in the aerospace industry. However, the mechanical properties of these alloys are insufficient in space conditions. AA7075 Al alloy is produced by powder metallurgy method due to the good wear properties. Then AA7075 Al alloys have to be adapted to mechanical properties MoS2-TiB2 composite films are deposited. MoS2-TiB2 composite films were grown on powder metal substrate using CFUBMS method in three different MoS2 target currents. Structural properties of composite films were analyzed by SEM, XRD and XPS methods. The mechanical properties of the films are carried out by microhardness and scratch tester. The best grade value of AA7075 powder metal alloy was made with 800MPa pressing pressure and increased from 2.61g/cm3 to 2.72g/cm3 after sintering. The highest hardness was obtained at the lowest MoS2 target voltage of 4.7GPa. The highest critical load value was obtained as 26N at the highest MoS2 target voltage.

https://doi.org/10.36937/ben.2020.002.004

Olanrewaju Alaba Abdulraham Sikiru Ottan

The study compares the drilling performance of Kymera and PDC bits in salt formation using River and Delta State Continental Shelf of Nigeria as a case study. The measurement while drilling (MWD) and the logging while drilling (LWD) methods were used to measure the real time well drilling operation. well formation and drilling statistics. The data obtained from the Ogbaimbiri. Ossiomo. Utorogu and Okporhuftu wells have the penetration rate of 6.2 m/hr. 5.9 m/hr. 12.2 m/hr. 6.3 m/hr for Kymera bit and 4.2 m/hr. 3.4 m/hr. 6.8 m/hr. 3.9 m/hr for PDC bit respectively. The pearson correlation coefficient has a value of r = 0.897. n = 4. p<0.05 and r = 0.784. n = 4. p<0.05 for both kymera and PDC bits. The results established a strong and positive correlation between the penetration rate and distance drilled in each bit. It also shows that the higher the penetration rate the more the distance drilled by each bit. The study concluded that the Kymera bit was more efficient as it was able to penetrate the different formations with a lesser time and at a greater penetration rate.

https://doi.org/10.36937/ben.2020.002.005