Ship repair has gained prominence as a service offered at the shipyards following a crisis in the shipbuilding industry, which has seen a fall in demand for new constructions, causing many companies in the sector to stall, especially shipyards. For a repair yard to be economically viable, in times of crisis, cost reduction is essential to make a sustainable business, so this comparative study aims to check the technical and economic feasibility of this change in the type of dry-docking. The present work deals with a comparative study between the use of the longitudinal slipway and the airbags for dry-docking and repair of river barges. The study sought to identify data from the vessels used for this project, to verify the average displacement of these vessels to analyze the airbags' carrying capacity, as well as the size of the winch to perform the dry-docking service. Since most repair yards use leased areas, the flexibility achieved with the use of airbags, as well as the reduced need for investments in the area, are benefits provided by using them. This work presented satisfactory results for the use of river barge docking airbags as a competitive alternative in repair services.

Currently, the high consumption of fossil fuels is causing problems, perhaps, irreversible to the planet, investing in green energy is an essential point for the sustainable development of any country. Concomitant to this, biomass fuels, in particular natural vegetable oils, appear as an option for the total or partial replacement of these fuels in the production of energy in the current world energy matrix. Corroborating this pretext, the objective of this work is to analyze the effects of using different mixtures of Brazilian commercial diesel oil (92% diesel, 8% biodiesel) with refined soybean oil from the effective cylinder pressure of a stationary diesel generator set. To achieve this purpose, the generator set of the Branco brand, model BD-6500, was used, with the aid of the pressure acquisition system of the Austrian company AVL. Analyzes of the requested fuels were carried out in addition to the experimental tests. The results presented show that the use of mixtures with volumetric ratios of soybean oil may show a drop in the cylinder pressure.

The understanding of causes and effects of the oceanic-atmospheric interactions allow us to evaluate the correlation between variables that controls the precipitation regime of our planet with the conditions of navigation of the amazon rivers, being for studies or for forecasts. The present paper seeks to find correlations between water level data of stations on Tapajós Rivers with the variables, here denominated as “extreme data”, that are influencing variables of the Enos phenomena such as temperature, pressure and radiation. The used forecast model is a multilayered neural network of the perceptron type with backpropagation algorithm. For the using of the neural network, data referring to Enos phenomena were collected, and as for the output, 30 years of water level historical data were collected so that the training process and validation of the models developed in Python could be made. After the results were obtained, a forecast analysis can be made to understand its behavior, the results and the possible theories that can explain the errors using RSME and R².

Intercontinental cargo transport is carried out mainly through the waterway modal, increasing the number of vessels and the deadweight of ships. This means that onshore ports cannot stand the cargo demands and, to make them competitive in this reality, a very high investment is needed, and their expansion can produce serious environmental impact. Thus, it is necessary to search for alternatives that facilitate the flow of vessels in the regional and world scenario. Hence, the present work conducts a technical and economic feasibility study of a direct offshore transshipment operation of solid bulk cargo of vegetable origin at the Organized Port of Vila do Conde, in Brazil, using the Net Present Value (NPV) methods, Internal Rate of Return (IRR) and Payback. In the study, three scenarios were considered, each of which had its particularity related to the operating life and the amount of cargo handled. Therefore, it was noted that offshore transshipment is more viable in two scenarios – the project's useful life is up to 14 years, so that the investment of capital in an onshore installation is more viable. Furthermore, it was found that, only in the worst-case scenario, offshore transshipment overlapped the other activity in any period of its useful life.