The novelty in this work consists in the identification of constructive solutions for bearing the main shaft with mounting in three and four support points. Improvements to the existing bearing construction solutions for existing turbines are also presented. As the bearings perform their function, which is essential to the mission inside the current turbines, with MW installed powers, dynamic stresses and unpredictable stresses lead to costly premature repairs. For the benefit of the wind industry, the reliability of the main shaft bearings needs to be improved. [1], [2], [3] The market demand motivates the development of new technical solutions for the replacement of standard radial thrust roller bearings in three-point bearing turbines, such as wear-resistant radial roller bearing roller bearings and two-row radial tapered roller bearings, pre-stressed [4] . For this reason, this work presents some constructive solutions that are efficient in the wind turbine industry. Also, there are presented some mode of failures, like: the incipient stages of micro exfoliation of the working surfaces of a two-row radial roller oscillating roller bearing in the main shaft of a wind turbine, insufficient lubrication, the simulations of different stages of distributions of pressure on inner and outer rings, equivalent (von Mises) stresses and an another improved construction solution of bearings. [4] In conclusion, the criteria for choosing the types of reliable wind turbines imply a special attention in choosing reliable bearing elements, with long operation times and as few repair / maintenance costs as possible. [5], [6]

Container terminals are the actual backbone of break bulk cargo transport around the world. Pressure by supply chains, coupled with the rapid growth in cargo amounts, result in an ever-increasing demand for productivity optimizations in this highly competitive market. Within short time windows, many cargo handling processes occur in parallel, and operational decisions should take into account both time efficiency and equipment utilization. Waterside operations consist in handling of containers by quay cranes, land based guided vehicles and yard cranes. The container relocation problem that minimizes the number of moves needed to retrieve all containers, while respecting a given order, is studied in parallel with the quay cranes scheduling to find an optimal sequence of crane operations that perform the required container movements. Starting with real data from Constanta Container Terminal, and studying the statistical relevance between operational indicators and applied inverse statistics as a pertinent tool for waiting time expectancy. In the paper is proposed a simulation based-optimization process viewing the dynamics of the Container Terminal as a complex system, because during operation, many sources of disturbance and uncertainty exist. Possible designs are investigated in the framework of Bayesian optimization and Simulated Annealing of the proposed time convergence algorithms. The research in the paper is based on real data from Constanta Container Terminal, and studied the statistical relevance between operational indicators and applied inverse statistics as a pertinent tool for waiting time expectancy.

The paper analyzes the tools for establishing the ecological status of marine ecosystems in the context of climate change. The novelty of the paper is the use of mapping applications to obtain information on the intended study location such as: data on the physical properties of ecosystems, how many types of habitats, lists of indicators and links to relevant publications and reports. The working tools are specialized programs. The results are descriptive indicators of the analyzed ecosystems: Biota, Phytoplankton, Benthic flora, Fauna, Benthic fauna, ichthyofaunal, Marine mammals, Seabirds, the number of indicators per related water column habitats, the number of indicators on seabed habitats, the number of indicators per habitat type for specific and non-specific taxonomy, the number of indicators depending on the existing pressures in the area. As a working method, we can highlight both frequently used tools (the risk matrix, the vulnerability) and a new tools (software) for assessing the state of the environment, which allows the assessment of the health of marine systems. The methods used can be validated for different locations. The following were analyzed: ecosystem status characteristics, pressures and impacts, risk matrix for a marine ecosystem, risk assessment, anthropogenic impact on marine ecosystems, a model and descriptive indicators of good ecological status of the ecosystem, as well as vulnerability. The obtained results are: the descriptive indicators for Black Sea marine ecosystem, the assessment of ecological status of the marine ecosystem, the risk matrix and vulnerability.

The paper presents: the terminal’s infrastructure, the loading’s plans, the equipment’s details, the operational data onboard, the systemic analysis of the terminal. In order to highlight the operational optimization in the cargo terminal, operating scenarios are proposed, to which simulation models are attached. Enter parameters such as towing units, return / load / unload speed, the distance between parallel and opposite parking rows and the load pick-up time, using working diagrams. It simulates the operability in the terminal. In the analyzed terminal, the expected size of the ship is not found in the equations attached to a simulation model, because the degree of berth occupancy is actually related to the number of access points, where a frame can be placed and not the length available berth. The terminal usually operates by scheduling ships in advance and therefore arrival times are usually planned in advance and follow a strict schedule. The simulation results (performance indicators) lead to the estimation of the values for the optimal quay time, in relation to the number of units for loading in the proposed scenarios. It takes into account whether the arrival pattern is random or scheduled and the time of service provided by the terminal. Also, the different types of goods and their distribution on the quay are identified and taken into account. A methodology for assessing the level of service provided by the terminal under certain operational constraints is also provided, in part, as a by-product of the methodology.