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Effect of Mooring Lines Pattern in a Semi-submersible Platform at Surge and Sway Movements

1Department of Marine Science and Technology, Science and Research Branch, Islamic Azad University, Tehran, Iran

2Department of Ocean Engineering, Amirkabir University of Technology, Tehran, Iran

3Department of Ocean Engineering, Khalij-e Fars University, Bushehr, Iran

Journal of Ocean Research. 2014, 2(1), 17-22
doi: 10.12691/jor-2-1-4
Copyright © 2014 Science and Education Publishing

Cite this paper:
Hadi Sabziyan, Hassan Ghassemi, Farhood Azarsina, Saeid Kazemi. Effect of Mooring Lines Pattern in a Semi-submersible Platform at Surge and Sway Movements. Journal of Ocean Research. 2014; 2(1):17-22. doi: 10.12691/jor-2-1-4.

Correspondence to: Hassan  Ghassemi, Department of Ocean Engineering, Amirkabir University of Technology, Tehran, Iran. Email:


Exposure to environmental conditions at sea for floating structures is inevitable. Environmental conditions that waves are most important of them will enter forces on structure of semi-submersible platforms. Therefore such structures should be deployed in the operational capability of their own, that one of these methods is mooring them. In this condition, structure shows different behavior compared with unmoored structure. Wave force cause motions of structure and subsequently produce tension force on mooring lines. Hence, investigation of structure movements and selection an appropriate mooring system to minimizing the structure motions must have been discussed. semi-submersible platforms mooring systems results restoring force in horizontal plane, and thus control degree of freedom on Surge, Sway and Yaw movements. This study estimated Surge and Sway movements of a semi-submersible platform when that it has been exposed to 0, 45 and 90 degrees of sea wave direction with the environmental conditions of the Caspian Sea using Flow-3d (version10.0.1) software. Also the seven symmetric mooring systems in the form of 4 and 8 numbers of mooring lines’ systems have been used to investigate the best modes.



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Predictability of the Electrical Conductivity of In situ Sea Water as a Function of Its pH

1Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria

2Department of Environmental Technology, Federal University of Technology, Owerri, Nigeria

3Department of Metallurgical and Materials Engineering, Enugu State University of Science & Technology, Enugu, Nigeria

4Department of Industrial Physics Ebonyi State University, Abakiliki, Nigeria

Journal of Ocean Research. 2014, 2(2), 23-27
doi: 10.12691/jor-2-2-1
Copyright © 2014 Science and Education Publishing

Cite this paper:
C. I. Nwoye, I. E. Nwosu, S. O. Nwakpa, J. U. Odo, S. E. Ede, N. E. Idenyi. Predictability of the Electrical Conductivity of In situ Sea Water as a Function of Its pH. Journal of Ocean Research. 2014; 2(2):23-27. doi: 10.12691/jor-2-2-1.

Correspondence to: C.  I. Nwoye, Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria. Email:


The paper presents an empirical analysis which predicts the electrical conductivity of in situ sea water as function of its pH. Response coefficient of the sea water electrical conductivity ζ to the influence of its pH ϑ was evaluated to ascertain the reliability of the highlighted dependence. A univariate model was derived, validated and used for the predictive evaluation of the in situ sea water electrical conductivity. The validity of the model; ζ=exp[ϑ0.963] was rooted on the core model expression lnζ = ϑ0.963 where both sides of the expression are correspondingly approximately equal. Standard errors incurred in predicting the sea water electrical conductivity for each value of the sea water pH considered as obtained from experiment, derived model and regression model-predicted results were 0.5233, 1.2127 and 0.0027% respectively. Furthermore the correlation between sea water electrical conductivity and its pH as obtained from experiment, derived model and regression model were all > 0.9. The maximum deviation of the model-predicted sea water electrical conductivity (from experimental results) was less than 18%. This translated into over 82% operational confidence for the derived model as well as over 0.82 response coefficients for the dependence of in situ sea water electrical conductivity on its pH.



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The Importance of Marine Genomics to Life

1Department of Marine Sciences, University of Lagos, Lagos, Nigeria

2Department of Environmental Planning, Brandenburg University of Technology, Cottbus-Senftenberg, Germany

Journal of Ocean Research. 2015, 3(1), 1-13
doi: 10.12691/jor-3-1-1
Copyright © 2015 Science and Education Publishing

Cite this paper:
Popoola Raimot Titilade, Elegbede Isa Olalekan. The Importance of Marine Genomics to Life. Journal of Ocean Research. 2015; 3(1):1-13. doi: 10.12691/jor-3-1-1.

Correspondence to: Popoola  Raimot Titilade, Department of Marine Sciences, University of Lagos, Lagos, Nigeria. Email:


Genomics is a field of study that is rapidly transforming many areas of biological and biomedical research which has enabled the transition from sequential studies of single genes to more ecological approach, involving the simultaneous study of many components and their interactions with the environment from pathways, through cell tissues to whole organisms and communities. Genomics application areas include clinical diagnostics, agro biotechnology, environmental biotechnology and pharmacogenomics. The focus of most genome research is on the nuclear genome, though mitochondrial genomes have been extremely useful for the identification of fish species and populations. Marine microbial assemblages are diverse and unique and the challenge is to discover what functions are played by these microorganisms. To provide adequate tools for marine biologists, therefore, one important aim will be to develop genomic approaches, such as whole genome sequencing and functional genomics, for key species across the evolutionary tree of marine organisms. Genomics is a highly dynamic research field. Hence, rapid developments in genomics can afford new opportunities for applications in marine environment, particularly in the areas of Fish genome resources conservation and genetic enhancement.



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