Vol 9 Issue 3 July 2021-September 2021

Abstract: This study was undertaken to compare the effects of heavy metals accumulation on soils from Solid Waste Dumpsites (SWD) and Automobile Workshops (AMW) within Uyo metropolis. Flame atomic absorption spectrometry was used to test the concentrations of mercury, Hg; zinc, Zn; copper, Cu; cadmium, Cd; lead, Pb, nickel, Ni; aluminium, Al; Arsenic, As; Manganese, Mn and Chromium, Cr in soils, while electrometric method was used to determine soil pH. Three representative samples were collected for each depth range (0-1.5m, 1.5-3m and 3-4.5m) from both sites. The mean concentration of heavy metals from AMW occurred in the order Zn>Cd>Mn>Pb>Ni>Fe>Cu>Al>Cr>As while for the SWD, Fe>Cd>Cu>Zn>Mn>Pb>As>Al>Ni>Cr. The mean concentrations of the major contaminants when compared to WHO standards (WHO: AMW, SWD) are Cd (0.0030mg/l: 0.1111mg, 0.2748mg/l), Pb (0.01mg/l: 0.0824mg/l, 0.1003mg/l) and Zn (0.1mg/l: 0.151mg/l, 0.1409mg/l). There were trace amounts of Cr, Cu, Mn, Ni and Al at both sites whereas, excess As occurred at the SWD. AMW had average pH level of 4.18 and SWD, 7.36.

Keywords: Chemical and physical properties of soil, Heavy metals, environmental health, Solid wastes, Automobile wastes.

Title: Comparative Study of Heavy Metals Accumulation in Soils of Solid Waste Dumpsites and Automobile Workshops in Uyo

Author: Christopher Afangideh, Inyeneobong Odiong, Imoh Udeme

International Journal of Engineering Research and Reviews

ISSN 2348-697X (Online)

Research Publish Journals

Abstract: The concept of electrochemical discharge machining (ECDM), also known as electrochemical spark machining (ECSM), was presented for the first time in 1968. Since then, this technology remains a research topic. In the domain of non-conventional machining methods, the electrochemical discharge machining (ECDM) process is emerging as a potential contender for machining of nonconductive, hard, and brittle materials. In the general ECDM process, the gas film forms, and electrical discharge appears at the tool end that is exposed to the electrolyte. In this research work, the ECDM experimental setup was fabricated for machining non-conducting materials. This machining process was used for the machining of silicon carbide which is very brittle and hard in nature. The input parameters considered for the process were selected as voltage, electrolyte concentration, inter-electrode gap whereas MRR, tool surface geography, and heat-affected zone were obtained as response parameters.

Keywords: Electrochemical discharge machining (ECDM), silicon carbide, voltage, electrolyte concentration, inter electrode gap, MRR, tool surface geography, heat affected zone.

Title: Experimental Study on Machining Parameter of Hard and Brittle Materials using ECDM Setup

Author: Naveesh G.A, Ruthik Shettigar, Shivaraj, Shreyas, Ravindra Naik

International Journal of Engineering Research and Reviews

ISSN 2348-697X (Online)

Research Publish Journals

Abstract: In the traditional evaluation system, which is based on paper, is consumed time to find out the result and to make a decision in such a specific sector of the education , however, online evaluation system does not need time to find out the good result since it show up by finishing the evaluation.

Online evaluation system is the best solution to develop an integrative student and lecturer’s performance system. This system is related to exams, lectures, instructors and administration. This evaluation system will assist the administration to make decisions or to guide decisions makers in the organizations or universities to take the right decisions and to improve the work .Also it is possible to calculate the student attendance and Grade Point Average (GPA) in the same system.

Research Method and system requirement was mentioned in details a research that could help to design the perfect system for online evaluation beside the data and information to be used in this system.

Keywords: evaluation system, developing online performance evaluation, engineering education, online integrative performance evaluation system, universities evaluation system, grade point average (GPA).

Title: Developing Online Integrative Performance Evaluation System in Universities: Students and Lecturers Perspectives

Author: ABDULREDHA A.M. BAQER

International Journal of Engineering Research and Reviews

ISSN 2348-697X (Online)

Research Publish Journals