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Mechanical Behavior of Nitrocarburised Austenitic Steel Coated with N-DLC by Means of DC and Pulsed Glow Discharge

Borowski Tomasz, Kulikowski Krzysztof, Spychalski Maciej, Rożniatowski Krzysztof, Rajchel B., Adamczyk-Cieślak Bogusława, Wierzchoń Tadeusz

Archives of Metallurgy and Materials

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2022

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Vol. 67, iss. 1

317--324

EN

AISI 316L steel was subjected to nitrocarburizing under glow discharge conditions, which was followed by DLC (diamond-like carbon) coatings deposition using the same device. The coatings were applied under conditions of direct current and pulsed glow discharge. In order to determine the influence of the produced nitrocarbon austenite layer and the type of discharge on the microstructure and mechanical properties of the coatings, the following features were analysed: surface roughness, coating thickness, structure, chemical composition, adhesion and resistance to frictional wear. For comparison purposes, DLC coatings were also deposited on steel without a nitrocarburised layer. The obtained results indicate a significant influence of the type of glow discharge on the roughness, hardness, nitrogen content and of the nitrocarburised layer on the resistance to wear by friction and adhesion of the produced coatings.

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Heat transfer investigations in a liquid that is mixed by means of a multi-ribbon mixer

Borowski Tomasz, Sołoducha Dawid, Musik Daniel, Wójcik Krzysztof, Chyla Mariusz, Ziętarska Katarzyna, Friedrich Małgorzata, Kiełbus-Rąpała Anna, Kordas Marian, Konopacki Maciej, Rakoczy Rafał

Polish Journal of Chemical Technology

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2021

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Vol. 23, nr 2

66--72

EN

The objective of this paper is to present the investigations of the heat transfer process carried out by means of the multi-ribbon mixer. It is shown that the heat transfer process for the synergic effect of the mixing process and the flowing liquid through the mixer has significantly higher values of the heat transfer coefficients than the mixer with motionless impellers. The empirical correlations between the heat transfer coefficient and the operational parameters obtained in this work can provide guidance for the design and operation of an apparatus equipped with the multi-ribbon impeller. These empirical correlations can be used to predict the heat transfer coefficient for the multi-ribbon mixer.

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Autonomiczna platforma sensorów z identyfikacji położenia (GPS) na przykładzie detekcji metali

Zawistowski Kamil, Borowski Tomasz

Elektronika : konstrukcje, technologie, zastosowania

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2021

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Vol. 62, nr 3

5--8

PL

W artykule opisano model autonomicznej platformy sensorów z identyfikacją jej lokalizacji (zrealizowanym w systemie GPS). Przedstawiony model przeznaczony jest do badań i weryfikacji koncepcji rozbudowanego systemu mogącego samodzielnie dokonywać rekonesansu terenu na okoliczność wykrywania zadanych rodzajów obiektów. Jednym z założeń projektu systemu autonomicznej platformy sensorów jest jej niskobudżetowość oraz prosta konfigurowalność. Wykonany modelu platformy oparty jest na typowych elementach i podzespołach (w roli sensora zastosowano prosty detektor metali), natomiast interfejs użytkownika powstał na bazie stworzonej do tego celu specjalnej aplikacji, uruchomionej w telefonie komórkowym. Na przykładzie wybranych elementów wchodzących w skład systemu przedstawiono wybrane etapy procesu tworzenia modelu autonomicznej platformy sensorów - obejmujące koncepcję i wykonanie prostego modele oraz aplikacji działającej na smartfonie, jak również przedstawiono przykłady ilustrują działanie całego systemu.

EN

The article describes the model of an autonomous sensor platform with the identification of its location (implemented in the GPS system). The presented model is intended for research and verification of the concept of an extensive system that can independently reconnaissance the area for the detection of given types of objects. One of the assumptions of the autonomous sensor platform system design is its low-cost and simple configurability. The platform model is based on typical elements and subassemblies (a simple metal detector was used as the sensor), while the user interface was created on the basis of a special application created for this purpose, running on a mobile phone. On the example of selected elements included in the system, selected stages of the process of creating an autonomous sensor platform model were presented - including the concept and execution of a simple model and application running on a smartphone, as well as examples illustrating the operation of the entire system.

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Studies of a mixing process induced by a rotating magnetic field with the application of magnetic particles

Rakoczy Rafał, Kordas Marian, Markowska-Szczupak Agata, Konopacki Maciej, Augustyniak Adrian, Jabłońska Joanna, Paszkiewicz Oliwia, Dubrowska Kamila, Story Grzegorz, Story Anna, Ziętarska Katarzyna, Sołoducha Dawid, Borowski Tomasz, Roszak Marta, Grygorcewicz Bartłomiej, Dołęgowska Barbara

Chemical and Process Engineering

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2021

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Vol. 42, nr 2

157-–172

EN

We demonstrate in this study that a rotating magnetic field (RMF) and spinning magnetic particles using this kind of magnetic field give rise to a motion mechanism capable of triggering mixing effect in liquids. In this experimental work two mixing mechanisms were used, magnetohydrodynamics due to the Lorentz force and mixing due to magnetic particles under the action of RMF, acted upon by the Kelvin force. To evidence these mechanisms, we report mixing time measured during the neutralization process (weak acid-strong base) under the action of RMF with and without magnetic particles. The efficiency of the mixing process was enhanced by a maximum of 6.5% and 12.8% owing to the application of RMF and the synergistic effect of magnetic field and magnetic particles, respectively

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Surface Acoustic Wave Interaction with a Mixture of Oxygen and Nitrogen

Pasternak Mateusz, Jasek Krzysztof, Grabka Michał, Borowski Tomasz

Archives of Acoustics

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2020

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Vol. 45, No. 3

483--486

EN

Parameters of surface acoustic waves (SAW) are very sensible to change of physical conditions of a propagation medium. In the classical theory formulation, the waves are guided along the boundary of semi-infinity solid state and free space. A real situation is more complex and a medium commonly consists of two physical components: a solid substrate and a gaseous or liquid environment. In the case of stress-free substrate, the strongest impact on SAW properties have surface electrical and mechanical conditions determined by solids or liquids adhering to the boundary. This impact is utilised for constructing sensors for different gases and vapours e.g. (Jakubik et al., 2007; Hejczyk et al., 2011; Jasek et al., 2012). The influence of gaseous environment on the SAW properties is usually very weak and ignored. However, in certain condition it can be significant enough to be applied to sensor construction. In general, it concerns Rayleigh wave devices where energy leakage phenomenon is perceptible, especially when the gas being detected considerably changes the density of environment. The paper presents the results of experiments with oxygen-nitrogen mixture. Their primary aim was focused on finding the dependence of resonant frequency and attenuation in SAW resonator on parameters and concentrations of the gas in the environment.