Muthanna Journal of Engineering and Technology(MJET)

The simultaneous removal of copper and cadmium from a simulated wastewater using rotating tubular packed bed of woven screens electrode was investigated. The effect of weight present of each metal on the removal efficiency and current efficiency was studied. The experiments were carried out at current 1.5 A, rotation speed 450 rpm, pH=2, and total concentration of metals (300 ppm) at different weight percent of each metal. The results showed that the removal efficiency of copper increased from 93.5 % to 99.33% as its weight percent increased from 20% to100%. In a similar fashion, the removal efficiency of cadmium increased from 80% to 90% as its weight percent increased from 20% to100 %. The results confirmed that the removal efficiency of any metals decreased in the presence of other metal. The results established that current efficiency for the simultaneous removal of copper and cadmium decreased with increasing of electrolysis time and Cd percent weight or decreasing of Cu weight percent. Current efficiency is higher at the initial stage of electrolysis and then declined with increasing time for all weight percent of metals.

This study aims to progress brittleness of the high strength lightweight aggregate concrete (HSLWAC) by using Porcelinite stone as light weight aggregates and silica fume with water cement ratio 0.28 to give 41.34 MPa compressive strength at 28-days and reinforced with carbon fibers. Fifteen mixtures using in this work with three various lengths of (5mm, 10mm, and 20mm), five mixes for every length with volume fractions (0.25%, 0.5%, 1.0%, 1.5%, and 2%) of carbon fibers. The slump test, compression strength, flexural strength, splitting tensile strength, and modulus of elasticity were investigated to determine the mechanical properties of (HSLWAC). The density of reference (HSLWAC) that was get through the experimental work was (1835 Kg/m3) at (28) days. The results shown that at general, the brittleness of (HSLWAC) improved with increased the content and length of carbon fibers, The optimum properties was for mix (L5) of 20mm length and 2% of carbon fibers of 45.44 MPa, 3.21MPa ,and 6.97MPa for compression strength, flexural strength, splitting tensile strength respectively.

A nanoantenna is designed to transform high frequency into energy. The proposed antenna is made of aluminuim. are shaped with a pair of nanoparticles brought in close nearness. Antennas separated by small gaps printed on a Si layer, which is designed as a flat-edge bowtie, with a ground plane at the under most of the substrate with a feeding putting in the gap of the bowtie antenna. The proposed antenna is designed using 3Delectromagnetic solver (CST) programs and analysed for the optimisation of metal thickness, gap size, and geometrical length. Simulations are conducted to investigate the behaviour of the nanoantenna illuminated by the linearly polarized plane wave. The nanoantenna parameters such as substrate thickness, feeding size, feeding type, and feeding material were changed to select the most efficient nanoantenna with a large directivity in our reaserch find the nanoantenna make a high electric field enhancement in their gap region. This specialty can be employed for SERS or biosensing to improve the detection limit and measure the presence of single molecules. For this, it is necessary to create antennas with enough small gaps, to be capable to recompense for the defects created during the fabrication process and reach antenna characteristics that are close to the ones presage by simulations.
The numerical simulations are studied to improve the best E-field of the antenna within the 250–700 THz frequency range. The proposed antenna offers multiple-resonance frequencies and good return loss in the frequency band of 310 THz, as well as an output electric field of 5.48 v/m to 7.8 v/m. Upon changing the type of feeding in the gap (without feeding, air feeding, dielectric silicon, or feeding), and we find that when using the air between the gap, the S-parameter is (-12.9) dB at the resonance frequency of (531.3) THz and the directivity is 7.41 dB at 666 THz incident frequency.