This paper presents the results of studies on the influence of unbalance of the rotor unit of a turbocharger on its operational parameters. Identification of the study object, a turbocharger of the NAPIER C-045 type, has been performed. The experiment was carried out at a test stand identifying turbocharger operational parameters belonging to the rotor unit unbalance group. Basing on the measured values and using a mathematical model, hypothetical values of operational parameters for different loads of Diesel engines were calculated. The obtained experimental results were compared to the calculated ones. On this basis, the studied turbochargers were classified into one out of three categories describing operational utility class of a given turbocharger. The order of sensitivity of turbocharger operational parameters to the unbalance of the rotor unit was establishe

Plaster plays an important role in the building industry. Besides an aesthetic function it provides the protection of external walls from weather conditions. In the paper thermo insulating Thermopor plaster was described. Its chemical and physical properties and manner of using were defined. The impact on the environment with the use of LCA technique was examined. Thermopor plaster can fulfil a thermo insulating function. The economic and ecological analysis of applying this plaster in the thermo insulation of the external walls of the building was conducted. The use of Thermopor plaster on external walls brings ecological benefits. The reimbursement of ecological cost related to the use of this plaster appears already after 2 to 5 years, depending on the source of heat used, which results from the decrease of thermal energy consumption for heating the building. For economic reasons, the partial reimbursement of cost is obtained as a result of the reduction of heating cost. Although Thermopor plaster has thermo insulating properties similar to typical insulating materials, such as polystyrene or mineral wool, the economic cost of using the plaster for thermo insulation becomes several times higher

The methods of synthesis of text models with information streams are researched. In the process of functioning of system of text models, which model systems of social objects the following are implemented: analysis of models of monitoring of information means, used by social objects, control of adequacy of models to objects and objects management. The synthesis of text models with information streams is implemented basing on use of semantic parameters. In process of text forms synthesis of models description and information streams appears necessity to output new text fragments, reflecting synthesis result. Such output processes are procedures based on use of logical schemas and grammar rules

Some possibilities of using computer simulation methods for LNG terminals operators have been presented in this article. A simulator in a training system is a very crucial tool because of practical application of the gained skills and knowledge. Maritime University is the only educational centre in Poland having the teaching base built on modern technical solutions allowing to train operators for LNG terminals

Electronic equipment used in transport operates under various conditions. Due to characteristic nature of their application, they should be highly reliable. This paper presents a methodology of optimising a bistable operation process of those systems factoring in economic factors, i.e. the funding allocated to routine inspections. Its practical application was also discussed, which would entail computer aided maintenance software

The paper studied the behavior of the composition and structure of the diffusion of chromium coatings in sliding. It was found that the strain in friction generates the secondary structure of chromium coatings and as a result of the deformation effect wear is accelerated due to separation of the coating

Inland shipping is the most eco-friendly way to move goods. This transport mode creates smaller external costs in comparison with road transport. The paper presents both inland shipping market analysis and innovative solutions for river ships with the purpose of EU transport policy realization, including environmental negative impacts reduction, minimization of oil-fuel consumption and cleaner energy use through alternative fuels and new propulsion systems

The article presents the analysis of possibilities of using the Digital Elevation (Surface) Models for creation of the 3D cadastre. The authors present the characteristics and meaning of the three-dimensional modelling of objects in the context of solving problems occurring with the traditional two-dimensional cadastre. The paper presents imperfections of the 2D cadastre and indicates possibilities of their removal based on altitude data acquired from the laser scanning. It determines the accuracy of data obtained with lidar techniques and indicates their limitations in specifying the exceeding. As a result of the carried out analysis and theoretical considerations, the authors have indicated the potential possibilities of the usage of Digital Surface (Elevation) Models for the construction of the three-dimensional cadastre system

In the years 2011–2012 Polish universities were obligated to implement education requirements in compliance with the National Qualifications Framework. First the universities defined intended learning outcomes, a basis on which curricula were drawn up. The most difficult part of the implemented system is the appropriate identification of method(s) to assess whether the expected learning outcomes have been achieved. This article discusses an examination system commissioned by maritime administration for seafarer examining, and indicates possibilities of using the developed solutions in the process of learning outcomes assessment at technical universities and academies

The paper presents basics of the eye tracking methodology and results of preliminary test on multi-purpose marine ship’s navigation bridge simulator. The use of the eye-tracker on the navigation bridge makes it possible to objectively measure the ergonomics of the individual interfaces, as well as to evaluate the decision-making process itself, including the mental workload and stress. In the experiment, officers were faced with an unexpected and sudden situation leading to a collision. The simulated situation required the officer to act immediately and resolutely, taking into account all his/her knowledge about the ship, and interpreting the available data correctly. Outcome of this test was compared with gaze data and it was proved that experienced group with best results suffered lowest level of mental workload and was most efficient in decision making process. Based on those results a possibility of improving simulator training with the use of eye tracking data is discusse

This study is an analysis of the possibility of harnessing backwater in open river channels to create waterways in the area of the river mouth. To accomplish this, simplified methods of analysing non-uniform flow have been assessed, with the use of Rühlmann’s, Tolkmitt’s and Bresse’s equations. It was demonstrated that Bresse’s method is the best of the three – the results obtained by using it to determine the range of backwater from the receiving body are much closer to true values than for the other two, and it is the only method that meets the physical criterion of backwater size with the boundary condition of Chezy depth tending to 0. The carried out analyses demonstrated that it is possible to create high-class waterways in lower reaches of rivers by modifying the geometry of their channels, namely the depth and slope of their bottom

This paper describes the process of drying of thermoplastic composites warp knows polyamide 6, an engineering polymer material. The results of absorption measurements of pure and polyamide 6 reinforced with cut glass fiber. Composite for injection molding processing conditioned in conditions similar to those prevailing in industrial warehouses and exposed to direct contact with water. Both, in one and in the second case of modified natural polyamide 6 cut glass fiber polymer material reduces the susceptibility to moisture absorption. Being the most important for the moisture content in the material has the first 10 hours of exposure of granules to various weather conditions

The paper introduces some aspects of maximum size ocean going ship’s safety during the sailing on Central American rivers. Based on solution of above problems, presented necessary hydrographical information concerning River Orinoco, Mississippi, Rio Magdalena and the most biggest of the World – Amazon River. Solutions of several river’s navigational and manoeuvres problems suggested by Traffic Engineering have also been presented. Independently, there are suggestions concerning improvements of the sea transport safety in the river’s estuary

The problems of embedding of message codes into Acoustic environment of speech are researched. The peculiarities of speech perception by human hearing are analyzed. As an example of acoustic message environment and codes of hidden messages embedded into it is reviewed a channel of mobile communication in the part of transformations which are implemented with acoustic signals. Approach to build a model of process of transmission of speech via non-linear channel basing on imagination about speech signals spectrum is developed. The proposals on methods of use of such models for analysis and interpretation of distortions of signals made by transformations, implemented in example channel are presente

This article presents the method of inventory of flood in the real-time GIS system. The method includes: obtaining data, sending data to the server of data base, their analysis in GIS environment and presentation of results. For this purpose the Open Source type of applications were used. The last stage of the presented method is the cartographic development of the hybrid map (orthophotomap with thematic overlays). The authors gave the boundary conditions of these types of studies taking into consideration the data obtained from various sensors of high resolution image systems. The presented method in a complex way describes the development of fast-changing data from the moment of existence of the change, through their acquisition, analysis, to the cartographic development of the map of flood changes