A composite material is a macroscopic combination of two or more distinct materials, having a recognizable interface between them. Modern composite materials are usually optimized to achieve a particular balance of properties for a given range of applications. Composites are commonly classified at two distinct levels. The first level of classification is usually made with respect to the matrix constituent. The major composite classes include organic – matrix composites (OMC's), metal – matrix composites (MMC's), and ceramic – matrix composites (CMC's). The OMC's is generally assumed to include two classes of composites: polymer – matrix composites (PMC's) and carbon – matrix composites (Peters, 1998). The composite material used in the work belongs to the PMC's and the composite is formed by the polymer matrix – rubber (sidewall mixture). As filler was used hard-magnetic strontium ferrite. Composite samples were prepared with different filler content (20%, 30%, 40%, 50%). Testing of polymer composites included: tensile test, elongation at break, hardness test and study of morphology.
The article presents a multi-aspect approach to the knowledge management system. Knowledge management focuses on the problem of creating and disposing of intellectual competence resources and practical skills, which are intangible assets of an enterprise. They concern different fields of science and empirical applications, and they are used to achieve a significant competitive advantage. In addition, knowledge management is focused on learning processes and improving the skills of the organization’s employees, systematizing and using knowledge in business practice. Therefore, effective use of knowledge management principles can contribute to increasing the effectiveness of the company’s operations and improving its competitive position.
The aim of this article is to present the concept of knowledge management through a critical analysis of domestic and foreign literature on issues related to knowledge processes, approaches to knowledge management and practices. The featured problem will be presented not only from the theoretical but also the practical side. Based on surveys conducted using the survey method, the most important benefits and barriers associated with introducing the concept of knowledge management or its elements in the enterprise will be identified.
In this article presented results of researching corrosion of steel bars in aggressive environment in time under loading. For researching were used special equipment. The experience and research works shown that steel bars in the crack cross-section area can be corrode. With increasing width of crack in re-bars and power of aggressive of environment increased the level of corrosion and decreased time of progress. The level of danger of corrosion in the crack in depend of specialty of steel bars. It is geometry parameters of steel bars and characteristic of corrosive behaviour. The general tendency of the influence of various defects on the strength of steels is widely studied experimentally and theoretically only for geometrically correct stress concentrators. For damages that are irregular in shape, such as corrosion ulcers, significantly less researching in each case must experiment to find their effect on the mechanical properties of steels. In this work the influence of simultaneous action of the aggressive environment and loading on strength of steel re-bars has been described.
Exhaust systems are susceptible to in-service wear because of their exposition to the very aggressive corrosive environment. Various stainless steels grades (mostly ferritic and austenitic, but also martensitic and duplex) and protective coatings are currently used for exhaust system elements to increase their aestetics and corrosion resistance. This article focuses on evaluation and comparison of the common corrosion properties of two stainless steels with different microstructures (ferritic and austenitic) used for exhaust system components at the low ambient temperature (35 °C). An aggressive acidic corrosion solution for electrochemical cyclic potentiodynamic tests (ASTM G61) was chosen to simulate partly inner (condensate) and also external environment (reaction of exhaust gases with water, chlorides in solution after winter road maintenance). Exposure tests of the pitting corrosion resistance were performed according to ASTM G48 standard method.
Safety is a key and necessary condition for the sustainable development of the railway industry. Every entity operating in the railway area should maintain and increase the level of security as part of its operations. The subject of the analysis of data on the rail transport safety in European countries and content of the safety culture program implemented in Poland, whose main objective is to implement safety culture principles in the railway transport and to encourage all companies operating in the railway industry to improve the rail transport safety as the key condition for the sustainable development of railway industry. Paper contains results of the analysis of the European rail transport safety level in the context of the objectives set for Poland indicated by the European Union (CSI value) as improvement areas.
This article presents the structure and analysis of information security incidents in a production company in 2015-2017. The purpose of the analysis is to identify incidental events and their frequencies. The analysis includes the occurrence of notifications, threatening events, employee errors and false alarms. The conducted research includes also the procedure for handling the incident in the enterprise. The enterprises very often avoid informing their contractors about the occurrence of incidents. Thanks to the analysis of incidents and a clearly defined action plan, the examined enterprise tested the incidents and actions taken with them as a method of creating the added value of the enterprise during the period under consideration. The conducted research has shown that contractors who are aware of preventive actions taken, as well as those affecting information security even after the occurrence of an incident, are more willing to provide trust and even support to the surveyed enterprise. The conducted analysis is a pilot study carried out in one large enterprise in the metallurgical industry. The aim of the conducted research is to show that the incident or negative event may have a positive impact on the company's image. The research was carried out with the use of a questionnaire and in-depth interview with representatives of enterprises that are co-operators of the examined company.
The article presents the CRM (Customer Relationship Management) philosophy. The principles of building the CRM strategy, enabling building and strengthening ties with the client (including ensuring its safety in relationship with a company), thanks to which the company can expect continuous sales, have been presented. Exemplary tools used in CRM (such as: call centre, contact centre, key account management) are listed and described. An attempt has been made to assess the cost-effectiveness of implementing the CRM philosophy in the enterprise based on the SWOT analysis. The strengths, weaknesses, opportunities and threats of such an undertaking were analysed, and the results were presented in the summary and final conclusions.
In the article some forms of damage to raceway of slewing bearings for single-row ball bearing slewing ring with four-point contact and their causes were shown. Changes of the contact angle and its influence on the geometry for contact zone of the rolling elements raceway were analyzed. An identification of changes for contact angle of individual balls for different parameters of the contact was received. It was showed that contact angles of some rolling elements were increasing. It can cause damage to the raceway by spalling or rolling out of edge of the bearing ring. Ways of avoiding too early damage to the raceway at the stage of the design and the selection of coronary bearings were suggested.
In this paper, the authors have discussed the subject of fire and explosion hazards during the operation of a modern ship's high-power internal combustion engines. The causes of the occurrence of and the methods of preventing explosions in the starting manifolds of modern piston combustion engines equipped with a pneumatic starting system, with starting valves on the cylinder heads, have been specified. The concept of an active system for monitoring the technical condition of the starting valves has been presented in order to quickly diagnose leakages and reduce the risk of explosion. A conceptual design of a prototype of a non-invasive, new generation leak detector for starting valves and its technical design have been presented. Exemplary implementations of the prototype detector have been shown and its selected functionalities have been discussed. This paper has ended with an assessment of the possibility of further development and the applications of this device.
Theoretical and experimental studies of new technology and equipment on the fulfilled cables and ropes of handling equipment are provided for diagnosis of main process. The result of the safe processing is steel fiber which is used further for production of a steel-fiber reinforced concrete. The research offered a number of essentially new diagnose methods which considerably increases engineering procedures of fiber production from waste.