Usage of Porous Al2O3 Layers for RH Sensing

At the Department of Electron Devices a cheap, more or less CMOS process compatible capacitive type RH sensor has been developed. Capacitive sensors are based on dielectric property changes of thin films upon water vapour uptake which depends on the surrounding media's relative humidity content. Because of the immense surface-to-volume ratio and the abundant void fraction, very high sensitivities can be obtained with porous ceramics. One of the ceramics to be used is porous Al2O3, obtained by electrochemical oxidation of aluminium under anodic bias. The average pore sizes are between 6...9 nm. In our paper we intend to demonstrate images representing the influence of the technological parameters on the porous structure and the device sensitivity.Comment: Submitted on behalf of EDA Publishing Association (http://irevues.inist.fr/EDA-Publishing

Formation of Oxide Layers with Femtosecond Laser on Steel Surfaces for Color Marking

With the appearance of ultrashort pulse lasers, the researchers have begun working on various laser marking technology. Atmospheric heating and ablation of a surface induce laser coloration of metal surfaces. However, their application is still problematic today in the industry. With the appearance of femtosecond pulse lasers, a new concept became available for color marking. This concept is based on the formation of laser-induced periodic surface structures (LIPSS) on metal surfaces. The purpose of this article is to summarize the literature of laser color marking with ultrashort pulse lasers

Surface activation of High Impact Polystyrene substrate using dynamic atmospheric pressure plasma

Over the last decade, the number of researches has increased in the field of bonding technologies. Researchers attempt to improve surface adhesion properties by surface treatments. Adhesive bonding is one of these bonding techniques, where it is important to see what surfaces will be bonded. One such surface property is wetting, which can be improved by several types of surface treatment. In recent years, atmospheric pressure plasmas have appeared, with which research is ongoing on surface treatments. In our research, we will deal with the effects of plasma surface treatment at atmospheric pressure and its measurement. In addition, we summarize the theoretical background of adhesion, surface tension and surface treatment with atmospheric pressure plasma. Our goal is to improve adhesion properties and thus the adhesion quality

Raspberry Pi 3 alapú UGV drone robot tervezés & megvalósítása

Az Ipar 4.0/IoT térhódításával megjelentek a vezeték nélküli (Wi-Fi) összeköttetésen alapuló technológiát kihasználó úgynevezett „okos” eszközök, amelyek távolról vezérelhetőek akár egy telefon segítségével. E projektben egy olyan UGV robot került megtervezésre és megépítésre, amelyet akár Android/iOS applikáción vagy PC-n keresztül lehet vezérelni, illetve a robot vision szenzor által látott kép stream-elésre kerül. A robot maga a Raspberry Pi 3 hardware-ére támaszkodik, ami rugalmassá teszi a feladatok elvégzésére, mivel kompakt, nagy teljesítményű és beépített Wi-fi adapter-el rendelkezik. Ezek mellett könnyen bővíthető olyan modulokkal, amelyek képesek szervo és DC motorokat vezérelni, ilyen is került alkalmazásra ebben a projektben. A robot az előbb említett vision szenzor segítségével képes adatot gyűjteni a külvilágból így felhasználó által való vezérlése a robotnak problémamentesen történik

Üveg megmunkálása femtoszekundumos impulzus lézerrel

Az utóbbi évtizedek technológiai fejlődésével az üveg az egyik legfontosabb műszaki anyaggá vált az építészeti, orvosi, autóipari és elektronikai alkalmazásokban. Az üveg megmunkálására számos hagyományos mechanikus technológia áll a rendelkezésre, melyeknek korlátjai vannak. A lézersugaras technológiáknak számos előnye van a hagyományos mechanikus megmunkálásokkal szemben, mint például az érintés mentes, gyors és automatizálható megmunkálás. A cikkben a Neumann János Egyetem Dióda Lézerközpontjában található femtoszekundumos lézerrel végzünk kísérleteket boroszilikát 3.3 üveg megmunkálására. | With the technological advances of recent decades, glass has become one of the most important engineering materials for architectural, medical, automotive and electronic applications. There are several traditional mechanical technologies for processing glass, but these have their limitations. Laser technologies have several advantages over traditional mechanical machining, such as non-contact, fast and automated machining. In this article, experiments are carried out with a femtosecond laser at the Diode Laser Centre at John von Neumann University to machine borosilicate glass 3.3

In vivo measurements with robust silicon-based multielectrode arrays with extreme shaft lengths

In this paper, manufacturing and in vivo testing of extreme-long Si-based neural microelectrode arrays are presented. Probes with different shaft lengths (15–70 mm) are formed by deep reactive ion etching and have been equipped with platinum electrodes of various configurations. In vivo measurements on rats indicate good mechanical stability, robust implantation, and targeting capability. High-quality signals have been recorded from different locations of the cerebrum of the rodents. The accompanied tissue damage is characterized by histology