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Multi-criteria optimisation of liquid cargo transport according to linguistic approach to the route selection task

100%

Guze S., Neumann T., Wilczynski P.

Polish Maritime Research

2017

tom 24

nr Special Issue S1

The main aim of the paper is to present the possibility of use of the multi-criteria optimization method Analytical Hierarchy Process (AHP) to liquid cargo transportation by sea. Finding the optimal solution is not simple. There are many factors influencing the shipping process. In the case of liquid cargo, the most important thing is the safety of the crew, ship, and environment. Therefore, the Mathematical Theory of Evidence is introduced and used to determine the optimal path in terms of time and safety of transport. Moreover, the details of liquid cargo transport process are described with particular attention to ship to ship operations. Besides, the basic concept of the AHP method, steps of the algorithm are introduced. Finally, the multicriteria optimization of the transport of the liquid cargo from the Persian Gulf to Port of Gdansk is done. It is based on the experts’ opinions

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Processes regulating pCO2 in the surface waters of the Central Eastern Gotland Sea: a model study

100%

Kuznetsov I., Neumann T., Schneider B., Yakushev E.

Oceanologia

2011

tom 53

nr 3

This work presents a one-dimensional simulation of the seasonal changes in CO2 partial pressure (pCO2). The results of the model were constrained using data from observations, which improved the model’s ability to estimate nitrogen fixation in the central Baltic Sea and allowed the impact of nitrogen fixation on the ecological state of the Baltic Sea to be studied. The model used here is the public domain water-column model GOTM (General Ocean Turbulence Model), which in this study was coupled with a modifed Baltic Sea ecosystem model, ERGOM (The Baltic Sea Research Institute’s ecosystem model). To estimate nitrogen fixation rates in the Gotland Sea, the ERGOM model was modified by including an additional cyanobacteria group able to fix nitrogen from March to June. Furthermore, the model was extended by a simple CO2 cycle. Variable C:P and N:P ratios, controlled by phosphate concentrations in ambient water, were used to represent cyanobacteria, detritus and sediment detritus. This approach improved the model’s ability to reproduce sea-surface phosphate and pCO2 dynamics. The resulting nitrogen fixation rates in 2005 for the two simulations, with and without the additional cyanobacteria group, were 259 and 278 mmol N m−2 year−1 respectively.

Ograniczanie wyników

1 Oceanologia

1 Polish Maritime Research

2 Neumann T.

1 Guze S.

1 Kuznetsov I.

1 Schneider B.

1 Wilczynski P.

1 Yakushev E.

1 2017

1 2011

Wyniki wyszukiwania

Multi-criteria optimisation of liquid cargo transport according to linguistic approach to the route selection task

Processes regulating pCO2 in the surface waters of the Central Eastern Gotland Sea: a model study