Wyniki wyszukiwania - BazTech

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Corrosion properties of Ni/Al2O3/Cgraphite hybrid composite layers

Bartoszek W., Cieślak G., Skroban K., Mazurek A., Trzaska M.

Ochrona przed Korozją

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2018

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nr 2

36--39

EN

The paper presents the results of studies of composite layers with nickel matrix and dispersed phase in the form of: alumina oxide (Al2O3) and graphite (Cgraphite) produced by electrodeposition on steel substrate. Three variants of composite layers were produced: Ni/Al2O3, Ni/Cgraphite, Ni/Al2O3/Cgraphite and for comparison purpose a nickel layer was also produced. Alumina oxide and graphite powders were used as dispersion phases. The dispersed phases were characterized by scanning electron microscopy (SEM) and Raman spectroscopy for graphite powder. The results of investigations of the structures of the produced layers with SEM, EDS, and results of Vickers hardness measurements as well as results of corrosion tests using electrochemical potentiodynamic method are presented. Damage characteristics after corrosion studies were obtained using a light microscope.

PL

W pracy przedstawiono wyniki badań warstw kompozytowych z niklową osnową oraz wbudowanymi w nią cząstkami faz dyspersyjnych w postaci: tlenku glinu (Al2O3) oraz grafitu (C grafit) wytwarzanych w procesie elektroosadzania na podłożu stalowym. Wytworzono trzy warianty powłok kompozytowych: Ni/Al2O3, Ni/C grafit, kompozytową warstwę hybrydową Ni/Al2O3/C grafit oraz w celach porównawczych warstwę niklową. Jako fazy dyspersyjne stosowano proszki Al2O3 oraz grafitu rozproszone w kąpieli Wattsa. Charakterystykę faz dyspersyjnych realizowano za pomocą skaningowej mikroskopii elektronowej (SEM) oraz spektroskopii Ramana dla proszku grafitu. Przedstawiono wyniki badań struktury oraz składu chemicznego wytworzonych warstw za pomocą SEM z przystawką EDS, wyniki pomiarów twardości metodą Vickersa, a także wyniki badań korozyjnych za pomocą elektrochemicznej metody potencjodynamicznej. Charakterystykę zniszczeń po badaniach korozyjnych dokonano za pomocą mikroskopu świetlnego.

2

Metody zapewniania jakości systemów informatycznych

Skroban K.

Zarządzanie Przedsiębiorstwem

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2004

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Vol. 7, nr 1

55-62

EN

There has been performed the analysis of techniques used in process of providing quality in computerized information systems. The following techniques have been described: - review of the system, - supervision of the system, audit of the system, inspection, - testing. The purpose of review is providing the correspondence of designed system with specification. The purpose of the system supervision is discovering and identifying its elements defects. The audit is led from the point of view of the system correspondence: verification with processed in act of designing, chosen standards, like procedure norm and instruction. The system supervision is based on principle that the other person, not the system creator, performs review of the documentation as well as searches for made errors. The purpose of the testing is discovering the errors in researched object that might be: the project of system, computerized information system, its part or prototype. Testing occurs in each cycle of life of computerized information system; it is a variant of industrial quality control. Majority of information products functions is not a subject of industrial quality tests. It results from the fact that software production most often is individual not serial or mass - produced. Therefore the methods of industrial quality controls do not apply to software. Each program owns unique combination of functions that differ. Big amount of software functions causes that amount of those combinations grows and very often is impossible to definite. Most often only 10% of program is the subject of verification. The number of applicable methods to provide the quality in computerized information systems is considerably smaller than system designing methods. Prevailing techniques do not provide obtaining high quality computerized information system. They do not guarantee obtainment of reliable computerized information system. Predominately used criterion is called system is good enough. Therefore verification of computerized information system quality is indispensable i.e. its control. The research made in industry shows that errors occur even in simple industrial production. Moreover only small part of quality estimation methods used in industry are applicable to estimate the quality of computerized information system. Inspection and testing are most often used methods of supervising.

3

Wykorzystanie metody oceny systemów informatycznych do formułowania wymagań przetargowych zgodnie z ustawą o zamówieniach publicznych

Skroban K.

Zarządzanie Przedsiębiorstwem

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2003

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Vol. 6, nr 2

37-43

EN

A review of methods for quality assurance during designing. projecting. implementing and putting into practice information systems in this research has been done. After information systems that aid management in small and medium size enterprises has been analyzed and after analysis of the Act of Public Orders requirements the model and the method for evaluating these systems have been done. For the evaluation of information systems quality parameters have been defined. These parameters have been combined into thematic groups called criteria. The following criteria have been separated: manufacturer reliability, the capability to satisfy users' information needs, genuine as regards law and formalities, designer work-shop, methods of assuring security, interface ergonomics, documentation, quality and exploitation unfailiness, economical system efficiency, qualification and the cost of users trainings and service. The aim of the worked out method is to facilitate the choice of information system in the process of company management. The parametrical method of evaluation of informatical system quality rely on: - Defying by users needs by subordinating adequate validity grades to each parameter; separating the group-critical criteria that are necessary for correct acting of the company and in case the critical criteria are not fulfilled all system can be declined. - The evaluation of each parameter upon proposed grades scale, made by experts. - The comparison of the final results. In the method (from products of validity grades and criteria evaluation) we obtain three kinds of final evaluations: - The evaluation of every functional area, separated as criterion the ability to satisfy information needs of the user, - Final evaluation of each criteria, - Global evaluation of all criteria. This method has been verified in some enterprises, . among others in manufacturing and service companies.