Search results

1 – 3 of 3
Open Access
Article
Publication date: 16 July 2020

Tomasz Matusiak, Arkadiusz Dabrowski and Leszek Golonka

The purpose of this paper is to present the properties of thick-film resistors made of novel pastes prepared from glass and graphite.

1489

Abstract

Purpose

The purpose of this paper is to present the properties of thick-film resistors made of novel pastes prepared from glass and graphite.

Design/methodology/approach

Graphite-based resistors were made of thick-film pastes with different graphite-to-glass mass fraction were prepared and examined. Sheet resistance, temperature coefficient of resistance, impact of humidity and short-term overload were investigated. The properties of the layers fired in atmospheres of air at 550°C and nitrogen at 875°C were compared.

Findings

Graphite-based resistors with various graphite-to-glass ratios made possible to obtain a wide range of sheet resistance from single O/square to few kO/square. These values were dependent on firing atmosphere, paste composition and the number of screen-printed layers. The samples made of paste with 1:1 graphite-to-glass ratio exhibited the temperature coefficient of resistance of about −1,000 ppm/°C, almost independently on the firing atmosphere and presence of a top coating. The resistors fired in the air after coating with overglaze, exhibited significantly lower sheet resistance, reduced impact of humidity and improved power capabilities.

Originality/value

In this paper, graphite-based resistors for applications in typical high-temperature cermet thick-film circuits were presented, whereas typical graphite-based resistors were fabricated in polymer thick-film technology. Owing to very low cost of the graphite, the material is suitable for low-power passive circuits, where components are not subjected into high temperature, above the typical temperature of operation of standard electronic components.

Details

Circuit World, vol. 47 no. 2
Type: Research Article
ISSN: 0305-6120

Keywords

Open Access
Article
Publication date: 12 May 2020

Tomasz Matusiak, Krzysztof Swiderski, Jan Macioszczyk, Piotr Jamroz, Pawel Pohl and Leszek Golonka

The purpose of this paper is to present a study on miniaturized instruments for analytical chemistry with a microplasma as the excitation source.

Abstract

Purpose

The purpose of this paper is to present a study on miniaturized instruments for analytical chemistry with a microplasma as the excitation source.

Design/methodology/approach

The atmospheric pressure glow microdischarge could be ignited inside a ceramic structure between a solid anode and a liquid cathode. As a result of the cathode sputtering of the solution, it was possible to determine its chemical composition by analyzing the emission spectra of the discharge. Cathodes with microfluidic channels and two types of anodes were constructed. Both types were tested through experimentation. Impact of the electrodes geometry on the discharge was established. A cathode aperture of various sizes and anodes made from different materials were used.

Findings

The spectroscopic properties of the discharge and its usefulness in the analysis depended on the ceramic structure. The surface area of the cathode aperture and the flow rate of the solution influence on the detection limits (DLs) of Zn and Cd.

Originality/value

Constructed ceramic structures were able to excite elements and their laboratory-size systems. During the experiments, Zn and Cd were detected with DLs 0.024 and 0.053 mg/L, respectively.

Details

Sensor Review, vol. 40 no. 4
Type: Research Article
ISSN: 0260-2288

Keywords

Open Access
Article
Publication date: 10 March 2020

Tomasz Kusio and Mariantonietta Fiore

As nowadays the knowledge economy puts a strong emphasis on the universities’ role in the present economy, the recent challenge focuses on the interrelations between…

2169

Abstract

Purpose

As nowadays the knowledge economy puts a strong emphasis on the universities’ role in the present economy, the recent challenge focuses on the interrelations between entrepreneurship culture and academic engagement. This study aims to investigate the new role that universities are assuming as entrepreneurial entities and gather information taking place internal university stakeholders and students’ perception on entrepreneurship education. The research hypothesis stands entrepreneurship is mainly supposed as being professionally and educationally active rather than setting up a company.

Design/methodology/approach

The present study carries out a study on the perception of entrepreneurship education conducted among students of the University of Economics in Krakow in the winter semester of the academic year 2017/2018. The selected target group meets the criteria of the different national country origin of the respondents. Another criterion for selecting the target group was diversity in the field of students’ academic interests.

Findings

The results of the study give a clear view of the still valid confirmation of the growing academic role in terms of entrepreneurship culture development that appears necessary to address the demand for global competitiveness. In particular, it is possible to categorize two groups of people, moderate and strong supporters of recognition that entrepreneurship is not only about starting a company but also at the same time that it is an expression of its own dynamic and entrepreneurial attitudes.

Practical implications

As the importance of entrepreneurship in the context of an entrepreneurial university is rising and the definition of entrepreneurship goes beyond its understanding of starting a business, universities and academic engagement can and have to better address and focus their planning of the courses and their contents.

Originality/value

The study sheds some light and gives some interesting perspectives on the issue of different levels of entrepreneurship education expectations against different levels at which this education should be provided. In addition, it is in line with the EU entrepreneurship competence framework (EntreComp) aimed at defining tools to improve the entrepreneurial capacity and culture of EU citizens and organizations by means of consensus among stakeholders and by establishing a bond between education and study.

Details

European Business Review, vol. 32 no. 3
Type: Research Article
ISSN: 0955-534X

Keywords

Access

Only content I have access to

Year

Content type

1 – 3 of 3