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In this paper an investigation of the quality of inkjet-printed conductive lines deposited on different substrates is presented. Three different types of ceramic substrates as well as an ink based on nanosilver powder were used for investigations. It was found that the inkjet-printing deposition on green tape LTCC and then co-firing with the conditions of an LTCC temperature profile is not a usable...
In this paper a new design and technology of microfluidic capillary sensors is presented. Those sensors can be applied for in situ classification of biological and chemical liquids. The principle of work of capillary sensors is based on changes of light transmission within capillary filled the liquid subject to a local heating pulse. An example of its application can be instant determining of biofuel...
Electrochemical sensors for various applications including diagnosis of infectious diseases, detection of chemicals, DNA hybridization and detection of pathogenic micro organisms have been reported in recent years. Realtime monitoring of food and water is a high priority globally and the presence of pathogenic micro organisms is a particular environmental concern. Although various measures like good...
W artykule poruszono problematykę modelowania w programie SPICE charakterystyk statycznych krzemowych elektroizolowanych diodowych modułów mocy. Do badań wybrano moduły zawierające diody typu PiN oraz diody typu FRED.
W artykule przeglądowym omówiono stan techniki aktywnych anten radarów wielofunkcyjnych stosowanych w stacjonarnych urządzeniach naziemnych. Aktywne anteny stosowane w radarach transportowaInych, samolotowych i okrętowych będą omówione w następnym artykule. Przedstawiono rozwiązania reprezentatywne dla anten aktywnych stosowanych w wymienionych radarach. Pokazano ich cechy charakterystyczne oraz tendencje...
In this study properties of Nasicon solid state gas sensors working in electrocatalytic mode are investigated. The principle of operation of such sensors is based on the excitation with a periodic potential signal, while current response is recorded. The sensors are prepared in ceramic technology with two different constructions. One construction is a symmetrical, sandwich type structure with electrolyte...
The measurement of the complex and the differential geometric parameters in the production process of cylindrical, square and rectangular rolling shaped metal profiles will inevitably lead to a rise in the production quality. The dynamism of the technological process and the influence of great number of outside factors over geometrical parameters of revolving, enforce development of an electronic...
W artykule rozpatrzono problem modulacji amplitudy sinusoidalnej fali nośnej przebiegiem pseudolosowym. Podano przykładowe realizacje generatorów sygnałów pseudolosowych i ich właściwości. Omówiono proces modulacji AM sygnałem pseudolosowym i właściwości widma sygnałów zmodulowanych. Zaproponowano fizyczną realizację modulatora wraz z układem kształtowania widma. Zaprezentowano wyniki badań symulacyjnych...
The article discusses the concept of acquisition and processing of thermal images recorded in the mode of spatial modulation. The basic problem related to analysing thermal images acquired in such a way is the inhomogeneity of the thermal background and significant diversification of signal levels, stemming from optic contrast differences. In the typical active thermography this is not a problem because...
In this paper the possibilities of using spray pyrolysis method to produce yttrium stabilized zircoma layers have been examined. A stainless steel, type 316L, was used as a substrate. It was important to determine the optimal conditions of the films preparation. The basic parameter in the pyrolysis technology process is a surface temperature, which was systematically examined. The layer was intended...
The geometrical and technological conditions of realization of hybrid circuits made on austenitic metal substrate in EMC aspects have been analyzed in this paper. The influence of path configurations, their geometrical and physical parameters on parasitic element parameters has been determined in quantitative point of view. On the basis carried out analysis of topical materials the mechanisms of propagation...
W artykule w syntetycznym ujęciu przedstawiono zagadnienie predykcji pogodowej, ze szczególnym uwzględnieniem detekcji zagrożeń atmosferycznych w ruchu drogowym. W kolejnych punktach opracowania opisano podstawy prognozowania pogodowego, scharakteryzowano przykładowe modele matematyczne oraz zaprezentowano autorski system wnioskowania o niebezpiecznych stanach atmosferycznych na drodze.
This article presents the design and results of study on the mechanoacoustic sensor used for monitoring cardiovascular activity. The basic idea was to utilize the presented sensor as a secondary element in the sensor system for contactless measurement of cardiac and respiratory activity. The sensor consists of a stethoscope head and an acoustic head which receives vibrations by means of the fiber...
The geometrical and technological conditions of realization of hybrid circuits made in LTCC technology in EMC aspects have been analyzed in this paper. The results of calculations and measurements of the change interval of parasitic element parameters in mutually parallel path systems have been presented for selected characteristic configurations of conducted path systems. In terms of quantity the...
The GENESI project has the ambitious goal of bringing WSN technology to the level where it can provide the core of the next generation of systems for structural health monitoring that are long lasting, pervasive and totally distributed and autonomous. This goal requires embracing engineering and scientific challenges never successfully tackled before. Sensor nodes will be redesigned to overcome their...
In this paper, we present the realization of assembly of SiC samples to DBC substrate (Direct Bonding Copper Substrate with 200 µm Gu metallization Au covered] by low-temperature sintering of micro scale Ag powder. In the preliminary experiments DBC test samples size 3 × 3 mm (in place of SiC die) were assembled to DBC substrate size 10 × 10 mm using following methods: a) sintering by Ag powder with...
This work presents long-term stability of thin-film and polymer thick-film resistors made on the surface or embedded in Printed Circuit Boards (PCBs]. Investigated test structures were made of nickel-phosphorus (Ni-P) alloy or polymer thick-film resistive inks on FR-4 laminate with similar sheet resistance (25 Ω/sq or 100 Ω/sq for Ni-P alloys and 20 Ω/sq. 200 Ω/ sq or 5 kΩ/sq for polymer thick-film...
For the last ten years there has been observed an increasing interest in the field of high temperature electronics. The development of engineering of wide-bandgap semiconductors (SiC. GaN) has brought new class of electronic devices that can work in harsh environment involving high temperature. This fact imposes development of passive components to enable manufacturing of fully functional devices...
Solid Oxide Fuel Cells (SOFCs) are close to commercialization and knowledge about degradation mechanism become a vital step for their further improvement. A powerful diagnosis tool is impedance spectroscopy (IS). The IS allows indicating the degrading element of the SOFC and may provide knowledge about nature of the degradation process. In this paper degradation of the SOFCs has been investigated...
This paper presents development and manufacturing processes of the fluorescence based microfluidic chip using Low Temperature Co-fired Ceramics technology (LTCC). The LTCC material was chosen because of its outstanding physical and chemical properties. Moreover, there is a possibility to integrate electronic and optoelectronic components into single LTCC microfluidic chip. The manufactured microfiuidic...
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