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Article
Publication date: 18 April 2008

Piotr Jasinski

The purpose of this work is to present the strategies and current state of development in the field of micro solid oxide fuel cells (μSOFC).

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Abstract

Purpose

The purpose of this work is to present the strategies and current state of development in the field of micro solid oxide fuel cells (μSOFC).

Design/methodology/approach

In the paper recent strategies of conventional and single chamber μSOFC are described. Some examples based on the author's research are presented.

Findings

It can be concluded that scale down of ceramic technologies is still more popular than MEMS. However, MEMS‐based technologies become recently to be used more frequently.

Research limitations/implications

The work is limited to the description of materials and technologies used in μSOFC.

Originality/value

The review presents very recent research in μSOFC. The results demonstrate critical areas in development of suitable technologies.

Details

Microelectronics International, vol. 25 no. 2
Type: Research Article
ISSN: 1356-5362

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Article
Publication date: 8 May 2018

Shirali Kadyrov, Piotr Sebastian Skrzypacz and Yakov Lvovich Familiant

The paper aims to emphasise how switched systems can be analysed with elementary techniques which require only undergraduate-level linear algebra and differential…

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61

Abstract

Purpose

The paper aims to emphasise how switched systems can be analysed with elementary techniques which require only undergraduate-level linear algebra and differential equations. It is also emphasised how math software can become useful for simplifying analytic complications.

Design/methodology/approach

The time domain voltage balance methodology is used for stability analysis. As for deriving formulas for the asymptotic average of both capacitor voltage and inductor current, a new simple analytic method is introduced.

Findings

It was shown analytically that the time average of capacitor voltage converges to half of the source voltage. A formula for the time average of the current of the inductor is also computed. As a by-product, it was discovered that the period of the current is half of the switching period. Numerical simulations are obtained to illustrate the accuracy of the results.

Research limitations/implications

Higher dimensional generalisations could become a bit complicated, as stability analysis of higher dimensional exponential matrices is not so easy to handle. On the other hand, the new discovery on the period of the current is more likely to give new insights into handling higher dimensional systems.

Practical implications

Analytical formulas are exact, and it helps in accurately modelling flying capacitor converts (FCCs) in practice.

Originality/value

FCC is well studied in engineering society. However, not much is done in obtaining closed form solutions using analysis. Also, math software is much used in computation of numerical results and obtaining simulations. In this paper, one more important aspect of math software is emphasised, namely, use symbolic and numeric computing environment Maple in analysis.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 37 no. 3
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 11 January 2018

Piotr Firek, Michal Cichomski, Michal Waskiewicz, Ireneusz Piwoński and Aneta Kisielewska

The purpose of this paper is to present possibility of fast and certain identification of bovine serum albumin (BSA) by means of ion-sensitive field effect transistor…

Abstract

Purpose

The purpose of this paper is to present possibility of fast and certain identification of bovine serum albumin (BSA) by means of ion-sensitive field effect transistor (ISFET) structures. Because BSA can cause allergic reactions in humans, it is one of reasons for development of sensitive sensors to detect residual BSA. BSA is commonly used in biochemistry and molecular biology in laboratory experiments. Therefore, to better understand the mechanism of signal transduction in simulated biological environment and to elucidate the role of adsorption of biomolecules in the generation of a signal at the interface with biological systems, the measurements of ISFET current response in the presence of BSA as a reference protein molecule were performed.

Design/methodology/approach

To fabricate transistors, silicon technology was used. The ISFET structures were coupled to specially designed double-side printed circuit board holder. After modification of the field effect transistor (FET) device with 3-aminopropyltriethoxysilane (APTES), a sensor with high sensitivity toward reference biomolecules was obtained. The current–voltage (I-V) characteristics of structures with and without gate modification were measured. Keithley SMU 236/237/238 measurement set was used. Deionized water solution and 0.05 per cent BSA were used.

Findings

In this research, a method of preparation of a biosensor based on a FET was developed. Sensitivity of APTES-modified FET device toward BSA as a biomolecule was investigated. I-V relationships of FET devices (with and without modification), being the effect of the interactions with the solution containing 0.05 per cent BSA, were measured and compared to the measurements performed for solutions without BSA.

Originality value

Compared to SiO2-containing ISFETs without modification or other different dielectrics, the application of APTES as the part of the membrane induced significant increase in their sensitivity to BSA.

Details

Circuit World, vol. 44 no. 1
Type: Research Article
ISSN: 0305-6120

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Book part
Publication date: 10 December 2012

Barbara Wejnert

Although there are many journalistic accounts of ongoing political events narrating about pro-democratic or antiauthoritarian movements, such as strikes, riots, and…

Abstract

Although there are many journalistic accounts of ongoing political events narrating about pro-democratic or antiauthoritarian movements, such as strikes, riots, and protest letters, not many scholarly analyses devote attention to the longitudinal analysis of the preceding events that lead to a spur of protests. Not many scholars account or are able to account for the activity of political dissidents that is often hidden, purposely censored, and covered from public eye. Most frequently, until the street strike and riots, the degree of spread of dissident activity within a country is unknown to scholars. It is equally difficult to find information about the national and international networks that political activists form to gain support and acceptance of their acclamations, propositions, and calls for political or economic reforms. Furthermore, only access to dissident press allows researchers to glimpse the activity of existing organizations looking at issues censored by existing governments.

Details

Linking Environment, Democracy and Gender
Type: Book
ISBN: 978-1-78190-337-7

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Article
Publication date: 1 March 2002

Maria Haberfeld, Piotr Walancik and Aaron M. Uydess

In January of 1999, following the philosophy of community oriented policing, the Polish National Police restructured its organization. This article presents results of two…

Abstract

In January of 1999, following the philosophy of community oriented policing, the Polish National Police restructured its organization. This article presents results of two phases out of a larger research project conducted with the Polish police and community members representing diverse environments including college students, politicians, and media representatives. Our results represent an analysis of over 2,000 questionnaires distributed to the members of the Polish police and contrasted against data collected from hundreds of questionnaires answered by college students in three cities. The questionnaire was designed to measure the degree of understanding of the role of the police in a democratic society, as perceived by both the public and the police. Some of the main principles of community‐oriented – problem‐solving policing are revisited in the questionnaire, providing a baseline for discussion about the feasibility of implementation of a philosophical paradigm in real‐life environments, when the actors involved have no clear concept about the roles they are supposed to play.

Details

Policing: An International Journal of Police Strategies & Management, vol. 25 no. 1
Type: Research Article
ISSN: 1363-951X

Keywords

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