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Basis of Biomass Grinders Sustainable Designing

Abstract

Grinding operations are one of the most commonly used preparation processes in many branches, for example in food, energy and chemical sectors. This paper focuses on the issues connected with design of technical objects in accordance with sustainable development assumptions. The aim of this study is to create methodology of sustainable design of grinding machine, including external influences involved in their operation, to increase safety, energy, economic and eco- efficiency. The problem formulated as a question: what techniques, equipment, methods, and ways should be used in design to obtain a new, better grinder structure? To resolve the problem, original methodology of sustainable design has been created.

Open access
The Bootstrap Method As A Tool To Improve The Design Of Experiments

Abstract

The paper considers the use of the bootstrap method to improve the determination of confidence intervals identified by the DOE (design of experiment) procedure. Two different approaches have been used: one that is appropriate for factorial designs and the other one relevant to the methodology of the response surface. Both approaches were tested on the real experiment datasets and compared with the results obtained from the classical statistical expressions based on well-known asymptotic formulas derived from the t distribution.

Open access
Business Risk and Project Management in Civil Construction Branch

Abstract

Project management is general planning, coordination and inspection of the project, from the initial stage all the way to final phase, its purpose is an accomplishment of the accepted task and creation of the functional final effect, without exceeding established costs, time-frames and fulfillment of required standards of the quality. The present article was devoted to the issue of the project management in the construction sector in order to reduce the business risk. The study is based on literature examinations with an own methodological solution for project management in the construction industry. After introducing a set of definitions of the project and describing the concept of project management, a characterization of the project management in the construction industry and its effects in the economic space were described

Open access
Comparison of Selected Shading Correction Methods

Abstract

Shade effect is a defect of the images very often invisible for human vision perception but may cause difficulties in proper image processing and object detection especially if the aim of the task is to proceed detection and quantitative analysis of the objects. There are several methods in image processing systems or presented in the literature, however some of them introduce unexpected changes in the images, what may interfere the final quantitative analysis. In order to solve this problem, authors proposed a new method for shade correction, which is based on simulation of the image background based on analytical methods which return pixel values representing smooth grey level changes. Comparison of the effects of correction by applying standard methods and the method proposed are presented.

Open access
Composites With Rubber Matrix And Ferrimagnetic Filling

Abstract

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.

Open access
Concept of Knowledge Management in Modern Enterprises

Abstract

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.

Open access
Corrosion of Reinforce Bars in RC Constructions

Abstract

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.

Open access
Corrosion Properties Of 1.4512 Ferritic And 1.4404 Austenitic Steels For The Automotive Industry

Abstract

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.

Open access
Creating Safe and Competitive Conditions for the Provision of Rail Transport Services

Abstract

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.

Open access
Creating Value Added for an Enterprise by Managing Information Security Incidents

Abstract

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.

Open access