Peer review is an essential part in the publication process, ensuring that Journal of Marine Science and Engineering maintains high quality standards for its published papers.[...]

Peer review is an essential part in the publication process, ensuring that Journal of Marine Science and Engineering maintains high quality standards for its published papers.[...]

In this study quality of locally produced bottled water brands in Oman assessed by comparing the chemical composition indicated on manufacturer’s label with local and international bottled water standards. Results indicated that all the bottled water brands are complying with Omani standards, GSO and IBWA standards. Based on ionic constituents, using piper diagram 20 different water types were identified, in which the most frequently observed type was Mg-Cl. It is found that imported mineral water brands had high levels of calcium compared to locally produced brands.  It was observed that local brands contributing only 3.3% of Dietary reference intake ( DRI) of calcium for adults. Based on dietary sodium contribution, Omani bottled water brands  are well within FDA's very low sodium category and suitable for individuals on severely restricted Na diet.

Heavy metals contamination Sources  are released into the environment by both natural and anthropogenic sources, industrial activities, especially mining and automobile exhausts (for lead), where are washed away by run-off into surface waters, thereby resulting in soil pollution and subsequently groundwater pollution. The main aim of this paper is to determine the levels/concentration of some heavy metals such as (Copper(Cu2+), Cadmium(Cd2+), Selenium(Se4+), Mercury(Hg2+), Arsenic(Ar2+), Lead(Pb2+), Zinc(Zn2+), Cyanide(CN-), Aluminum(Al3+) and Boron(B3+)) in groundwater of Dhamar basin and to compare the result obtained with (WHO) standards. The obtained result of more samples showed that ((Copper(Cu2+), Cadmium(Cd2+), Selenium(Se4+), Mercury(Hg2+), Arsenic(Ar2+), Lead(Pb2+), Zinc(Zn2+), Cyanide(CN-)) were within the permissible limit except one water sample (Well 4). the contamination of the last one is due to the effluent of Dhamar WWTP. On the other hand, a high concentration level of Aluminum(Al3+) and Boron(B3+) is found in all samples were higher than the permissible limit set by WHO. The obtained results show that all water samples are potable and can be safely used for both drinking except one water sample (Well 4(.

Heavy metals are present in liquid effluents due to different industrial activities. Their presence in high concentrations constitutes an embarrassment for receiving environments, and strongly impacts water resources which, in a context of scarcity and climate change that exacerbates it, must be protected and safeguarded. This has prompted the implementation of numerous remedial measures, such as reducing the quantities of raw materials used, and curatives measures in order to reduce the nuisance. The object of this work is the removal of nickel from the effluent of an electroplating unit by precipitation with sodium hydroxide. The expected aim is firstly to minimize metallic pollution in order to discharge treated waste to meet the standards for indirect discharges into the municipal sewerage network or to reuse them in the industrial unit for other needs such as washing the workshops, washing the aerosol-filled air in the varnishing workshop, etc., and on the other hand, adding value to the precipitate in other industrial sectors. The tests were carried out in a batch reactor on industrial effluent solutions. They gave a nickel removal efficiency about 100%. The sludge resulting from the precipitation has been characterized by X-ray diffractometry. It consist essentially of nickel hydroxide II, in the form of β-Ni(OH)2 structure.

The theoretical description of the electrochemical determination of sartan antihypertensive drugs, assisted by novel triazolic derivatives, using a disulfonic organic acid as a binder, has been made. The correspondent mathematical model was analyzed by means of linear stability theory and bifurcation analysis. It was shown that, despite of the DEL influences of both chemical and electrochemical stages, the electroanalytical process is realized efficiently, if certain conditions are remaining satisfied. The oscillatory behavior is more probable than in a more common case of electrochemical triazole-assisted determination.

A study of the leaching behavior of immobilized contaminated soil, as radioactive waste, has been performed using an IAEA recommended semi-dynamic leaching test. Different radioactive waste matrices were prepared by solidifying soil contaminated by 226Ra and 40K radionuclides, with cement and bentonite as additive. The experimental data of this test were fitted to a semi-empirical mathematical model based on simple leaching rate mechanisms to evaluate the mechanisms those instigate the leaching phenomena. The results indicated that the controlling leaching mechanism is the diffusion but the leaching phenomenon of both radionuclides is the result of a combination of first order reaction and diffusion mechanisms

This work has been done to improve thermal insulation qualities of two kinds of clay by combining them with granular cork. The clays compared, were taken from two regions in Morocco near Rabat and Ifrane. The thermal properties of the two composites were measured using the asymmetrical hot plate method in steady state and flash method. A comparison of energy gain has been done between the clays to confirm the behavior of cork inthe clay matrix.

The building material component and more specifically the thermal insulation envelope are displayed as a large energy-saving deposit in the building sector. This scientific research involves the thermal conductivity of a new multilayer building material based on ecological additives. This material consists of three layers; the intermediate layer is composed of clay combined with cork aggregates to reinforce the thermal insulation of the intermediate volume. The inner and the outer layers are made of a cement mortar to increase the protection of the internal and external facade of the wall. The cork aggregates simultaneously make it possible to reinforce the thermal insulation of the wall and to increase the adhesion between cement mortar layer and clay-granular cork layer. The thermal conductivity study was carried out using the asymmetrical hot plate method in permanent regime. Finally, a comparison of the energy gain and gain of lightness was done between this binder, clay alone and cement mortar. The results obtained are encouraging, demonstrating that the multilayer developed in this study increases the internal and external protection and thermal insulation of the walls and improves the energy efficiency of the building.

Thermal sprayed coatings have a crucial role for protection of surfaces against high temperature, wear, erosion and corrosion. They are built up by successive accumulation of thin layers, called splats, generated by impact and solidification of individual molten particles. However, the coatings properties such as adhesion strength and adherence to the substrate are strongly influenced by the presence of micro-cracks or interfacial debonding resulting from the relaxation of stresses generated within the coating. In this paper, a numerical simulation based on the Finite Element Method is carried out to analyze in a first time the thermo-mechanical process of the formation of the first splat, initially molten ceramic particle, deposited onto a metallic substrate. In a second time, the obtained results are used as initial conditions to predict the residual stress induced during deposition of the splat. The effect of substrate initial temperature on the stress generation is also analyzed and the results show that the residual stress can significantly be reduced when the substrate is preheated.