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Optyczna tomografia niskokoherentna w badaniach obiektów technicznych
PublicationW pracy przedstawiono polaryzacyjny system OCT pracujący w dziedzinie czasu z detekcją zrównoważoną do badań obiektów technicznych. Obiektem badań z wykorzystaniem tego systemu były warstwy wykonane z ceramiki PLZT 9/65/35. Mierzone były grubości tych warstw i ich jednorodność.
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Microfluidically Frequency-Reconfigurable Self-Quadruplexing Antenna Based on Substrate Integrated Square-Cavity
PublicationIn this article, a novel concept of self-quadruplexing tunable antenna (SQTA) enabled by microfluidic channels is investigated. The operating channels are either filled with air or dielectric liquids to enable frequency tunability. The proposed SQTA is implemented on the substrate-integrated square-cavity (SISC). A swastika-shaped slot is milled on the top-surface of the SISC to create four quarter-mode resonators. The resonators...
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Magnetic semiconductor photocatalysts for the degradation of recalcitrant chemicals from flow back water
PublicationIn the present study treatability of persistent organic compounds from the flow back water after hydrauling fracturing was investigated. The combination of TiO2 photocatalyst and magnetic oxide nanoparticles enhance the separation and recoverable property of nanosized TiO2 photocatalyst. Fe3O4/ TiO2 and Fe3O4@SiO2/TiO2 nanocomposites were prepared by heteroagglomeration. The photocatalysts’ characteristics by X-ray diffractometry...
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Study of abrasive slurry dosage in flat surfaces lapping process
PublicationPrzedstawiono wyniki badań dozowania pasty i zawiesiny ściernej w procesach docierania powierzchni płaskich. Badano wpływ wielkości dawki ścierniwa na podstawowe parametry chropowatości powierzchni elementów miedzianych i ceramicznych. Docierano miedź betlenową MOOB oraz ceramikę Al2O3 i Al2O3-ZrO2 mikroziarnami węglika krzemu i węglika boru.
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Allergic reactions as a defense of the organism to the influence of implants components made of stainless steel
PublicationDue to the increasing number of cases of hypersensitivity caused by direct contact with metals, as well as the increasing demand for implants in humans all ages numerous studies on the effects of the impact of implant components are being carried out. The paper presents the phenomenon of etiology of allergy in general terms and in relation to the biomaterials used in medicine. There have been characterized in terms of impact on...
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Allergic Reactions as a Defense of the Organism to the Influence of Implants Components Made of Stainless Steel
PublicationDue to the increasing number of cases of hypersensitivity caused by direct contact with metals, as well as the increasing demand for implants in humans all ages numerous studies on the effects of the impact of implant components are being carried out. The paper presents the phenomenon of etiology of allergy in general terms and in relation to the biomaterials used in medicine. There have been characterized in terms of impact on...
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Development of polyurethanes for bone repair
PublicationThe purpose of this paper is to review recent developments on polyurethanes aimed at the design, synthesis, modifications, and biological properties in the field of bone tissue engineering. Different polyurethane systems are presented and discussed in terms of biodegradation, biocompatibility and bioactivity. A comprehensive discussion is provided of the influence of hard to soft segments ratio, catalysts, stiffness and hydrophilicity...
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In Vitro Dissolution of Na-Ca-P-Oxynitrides
Publication: Sodium-calcium-phosphate based oxynitride glasses and glass-ceramics doped with Mg, Si, and Nb were studied in vitro in simulated body fluid (SBF) under static conditions. The release of ions and pH changes up to 7 days of immersion were investigated. The nitrogen incorporation into phosphate glass matrix was found to notably influence in vitro dissolution only of homogenous glasses. Increasing the nitrogen content in the samples...
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Novel Low-Loss Substrates for 5G Applications
PublicationThis paper presents a feasibility study of a new type of microwave low-loss dielectric substrates for 5G network applications. The new substrate materials are composites of polypropylene and high-dielectric-constant micro-ceramics. This combination is expected to form a very low-loss dielectric material at low fabrication cost. Two substrate samples with different dielectric properties are fabricated and their characteristics at...
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Influence of silver nanoparticles addition on antibacterial properties of PEO coatings formed on magnesium
PublicationMagnesium is a biodegradable material and thus could be a choice for bone fixation devices and implants with a specific purpose. This study aims to enhance the anti-corrosive, biocompatible, and antibacterial properties on magnesium-based materials through ceramic coatings formation. To achieve this the silicate-based electrolyte was used to create of Plasma Electrolytic Oxidation (PEO) coatings. During investigation the bioactive...
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Reducing common mode voltage and bearing currents in quasi - resonant DC - link inverter
PublicationIn the paper, a concept of separation of an inverter-fed induction motor drive from its mains supply by two transistor switches inserted in the dc-link circuit is reexamined based on the proposed parallel quasi-resonant dc-link inverter (PQRDCLI). The objective of the paper is to show an advantage of the proposed topology in limiting high frequency common mode voltage and bearing currents. In the laboratory setup, an induction...
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Electrodeposited Biocoatings, Their Properties and Fabrication Technologies: A Review
PublicationCoatings deposited under an electric field are applied for the surface modification of biomaterials. This review is aimed to characterize the state-of-art in this area with an emphasis on the advantages and disadvantages of used methods, process determinants, and properties of coatings. Over 170 articles, published mainly during the last ten years, were chosen, and reviewed as the most representative. The most recent developments...
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Open-Source Coprocessor for Integer Multiple Precision Arithmetic
PublicationThis paper presents an open-source digital circuit of the coprocessor for an integer multiple-precision arithmetic (MPA). The purpose of this coprocessor is to support a central processing unit (CPU) by offloading computations requiring integer precision higher than 32/64 bits. The coprocessor is developed using the very high speed integrated circuit hardware description language (VHDL) as an intellectual property (IP) core. Therefore,...
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Szlifowanie jednostronne ściernicami o spoiwie niklowym z ziarnami z regularnego azotku boru
PublicationPrzedstawiono wyniki badań eksperymentalnych szlifowania jednostronnego stali stopowej 40H i ceramiki beztlenkowej SSiC z zastosowaniem ściernic o spoiwie niklowym z ziarnami z regularnego azotku boru B107 i B64. Zaprezentowano uzyskane wartości liniowego ubytku materiałowego oraz parametru Ra chropowatości powierzchni. Scharakteryzowano ogólnie zużycie czynnej powierzchni ściernicy.
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Szlifowanie jednostronne ściernicami o spoiwie niklowym z ziarnami z regularnego azotku boru
PublicationPrzedstawiono wyniki badań eksperymentalnych szlifowania jednostronnego stali stopowej 40H i ceramiki beztlenkowej SSiC z zastosowaniem ściernic o spoiwie niklowym z ziarnami z regularnego azotku boru B107 i B64. Zaprezentowano uzyskane wartości liniowego ubytku materiałowego oraz parametru Ra chropowatości powierzchni. Scharakteryzowano ogólnie zużycie czynnej powierzchni ściernicy.
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Niobate in silicate and phosphate glasses: Effect of glass basicity on crucible dissolution
PublicationUsing niobium crucibles for melting phosphate and silicate glasses of various modifier oxide contents, and therefore varying optical basicity (Λ), was found to result in varying dissolution rates of niobate during melting. Because of their high electronic polarizability, even small concentrations of niobates are detectable in the Raman spectra of glasses. Even less than 1 mol% Nb2O5 can be identified, as independently confirmed...
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Wybrane problemy szlifowania powierzchni płaskich z kinematyką docierania
PublicationW pracy przedstawiono teoretyczne i doświadczalne podstawy szlifowania powierzchni płaskich z kinematyką docierania. Dokonano kompleksowej analizy zastosowanych układów kinematycznych szlifierek. Przeprowadzono eksperymenty szlifowania jednostronnego ściernicami o spoiwie galwanicznym z ziarnami diamentowymi (D107, D64 i D46) oraz z regularnego azotku boru (B107 i B64). Innowacyjność ściernic polegała na zróżnicowanym utwierdzeniu...
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Vertical vibration reduction and audible sound analysis in surface grinding with electroplated tools
PublicationOne of the first approaches to the development of a grinding process monitoring system based on audible sound sensors is presented in the paper. Electroplated diamond tools (abrasive D64 and D107) were used in a modified single-disc lapping machine configuration for flat grinding of ceramics (Al2O3). The main aim of the machine modification was to reduce the vertical vibration in order to decrease the tool wear and to increase...
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Physicochemical and catalytic properties of ployaniline protonated with 12-molybdophosphoric acid
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Zastosowanie narzędzi ze spoiwem galwanicznym w mikroszlifowaniu powierzchni płaskich
PublicationW pracy przedstawiono wyniki z badań mikroszlifowania powierzchni płaskich w zmodyfikowanym układzie docierarki jednotarczowej z zastosowaniem narzędzi ze spoiwem galwanicznym. Czynną powierzchnię narzędzia pokryto ziarnami diamentowymi D64 i D107 oraz borazonowymi B64 i B107. Badaniom poddane zostały przedmioty wykonane z ceramiki technicznej o średnicy 34 mm.
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Planowanie strategiczne w polskich spółkach giełdowych.
PublicationBadanie spółki akcyjne wykazywały w różnym stopniu sformalizowanie elementów planowania strategicznego. Ujawniony został brak spójności między słabymi stronami, celami strategicznymi i programami strategicznymi, spółki pomijały w planowaniu czynnik kultury organizacyjnej związany z utrzymaniem równowagi organizacyjnej.
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Zagospodarowanie proszku krzemowego, wytworzonego z odzyskanych w procesie recyklingu uszkodzonych ogniw modułów fotowoltaicznych = Utilization of silicon powder, recovered in the PV cell's production and recycling processes
PublicationW artykule przedstawiono wyniki analizy proszku krzemowego różnego pochodzenia i wskazano możliwości technologiczne zagospodarowania proszku krzemowego: jako podstawowego surowca do produkcji nowych ogniw fotowoltaicznych, jako dodatku do stali stopowych, poprawiających ich własności mechaniczne (twardość, wytrzymałość na rozciąganie, udarność) oraz jako materiału do wytwarzania ceramiki, bazującej na proszkach niemetali.
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Niskokoherentny, interferometryczny system do badaniawłaściwości materiałów ceramicznych
PublicationPrzedstawiono światłowodowy system dwuwymiarowej wizualizacjiniejednorodnych struktur warstw ceramicznych. Omówiono projekti fizyczną realizację układu wykorzystującego optyczną, niskokoherentną reflektometrię optyczną, która umożliwia nieinwazyjne i bezkontaktowe obrazowanie wewnętrznych struktur różnych materiałówsilnie rozpraszających promieniowanie. Przedstawiono przykładowewyniki pomiarów wewnętrznych warstw ceramiki LSFO....
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Correlation between structural and electrical properties in highly porous (Y,Sr)(Ti,Nb)O3-delta SOFC anodes
PublicationIn order to find a relationship between structural and electrical properties, niobium and yttrium doped SrTiO3 ceramics were prepared via solid-state reaction. The samples were sintered in hydrogen and air conditions. The samples were also fabricated with a pore-former to obtain highly porous specimens. The electrical properties of Nb-doped SrTiO3 samples and yttrium and niobium co-doped SrTiO3 were compared. The comparable electrical...
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Design of an Autonomous IoT Node Powered by a Perovskite-Based Wave Energy Converter
PublicationThis paper presents the results of experimental research focused on wave energy harvesting and its conversion to power Internet of Things (IoT) devices. The harvesting and conversion process was performed using a wave energy converter (WEC) consisting of a lead zirconate titanate piezoelectric ceramic perovskite material and a prototype power electronic circuit. The designed WEC was considered as a power supply for an end node...
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Structure and hyperfine interactions in Bi1−xNdxFeO3 solid solutions prepared by solid-state sintering
PublicationThe series of polycrystalline ceramic powders, Bi1xNdxFeO3 (x = 0.11) was successfully synthesized by mixed oxide method followed by pressureless sintering. X-ray diffraction and Mössbauer spectroscopy were used as complementary methods to study structure and hyperfine interactions of the samples. It was found that with an increase of Nd content, within the range of x = 0.20.3 a structural phase transition from rhombohedral to...
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Improvement of the Chimney Effect in Stack Ventilation
PublicationThe article is focused on the airflow in a ventilation system in a building. The work examines the methods which enhance the chimney effect. In this paper, three cases with different chimneys were analyzed for the full-scale experiment. These cases were characterized by different geometrical and material parameters, leading to differences in the intensity of the ventilation airflow. The common denominator of the cases was the room...
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Potentiometric Oxygen Sensor with Solid State Reference Electrode
PublicationThe concentration or the partial pressure of oxygen in an environment can be determined using different measuring principles. For high temperature measurements of oxygen, ceramic-based sensors are the most practical. They are simple in construction, exploration and maintenance. A typical oxygen potentiometric sensor consists of an oxygen ion conducting solid electrolyte and two electrodes deposited...
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The Effect of Sodium Tetrafluoroborate on the Properties of Conversion Coatings Formed on the AZ91D Magnesium Alloy by Plasma Electrolytic Oxidation
PublicationMagnesium and its alloys are widely used in many areas because of their light weight, excellent dimensional stability, and high strength-to-weight ratio. However, the material exhibits poor wear and corrosion resistance, which limits its use. Plasma electrolytic oxidation (PEO) is an effective surface modification method for producing ceramic oxide layers on Mg and their alloys. The influence of the additions of sodium tetrafluoroborate...
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Optical low-coherence interferometry for selected technical applications
PublicationW artykule przedstawiono teoretyczne podstawy optycznej interferometrii niskokoherentnej i przedyskutowano jej unikatowe właściwości. Opisano w nim opracowany przez autorów system OCT przeznaczony do badań strukturalnych materiałów technicznych. Badania te obejmują także zmiany stanu polaryzacji promieniowania rozproszonego w badanym obiekcie. W artykule zawarto wyniki badań wybranych materiałów silnie rozpraszających promieniowanie...
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Coatings in arthroplasty [online]
PublicationThe modern coatings used in arthroplasty for long term implants are reviewed. The phosphate coatingsare the most popular technique to improve the bone-implant interfacial strength and promote theosseointegration. The plasma spraying, electrophoretic precipitation, powder metallurgy, ion beamsputtering, high velocity oxy-fuel (HVOF) combustion spraying, sol-gel technique, biomimeticdeposition are mostly used to obtain the phosphate,...
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KTaO3 a perovskite for water and air treatment
PublicationPerovskites are inorganic compounds that exhibit dielectric properties. These minerals belong to the crystal ceramics family. These compounds are described by the formula: ABX3 where, A and B are 2, 3 or 4 valuable metal ions, and X is an ion of oxygen or fluorine. An example of perovskite is the compound KTaO3. There are many methods for producing KTaO3, but the hydrothermal method is most commonly used. Perovskites can be characterized...
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Heat Transfer of the Multicolor-Laser-Sources-Irradiated Nanoparticles in Reference to Thermal Processes
PublicationUnlike the standard materials, metallic nanoparticles offer enhancing the heat convertion rate which implies the maximum and average temperature boost significantly in the considered system. The work’s purpose is to examine heat transfer in the metallic nanoparticles which have been deposited on a glassy substrate, enabling the nanostructures thermoablation. Furthermore, the functionalized substrate is irradiated with multicolor-laser-sources,...
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Identyfikacja i potencjał rozwojowy funkcji metropolitalnych w obszarze metropolitalnym Trójmiasta
PublicationCelem ekspertyzy autorskiej jest:- delimitacja istrukturalizacja warstwy metropolitalnej, obejmującej relacje przestrzenne pomiędzy istniejącymi i potencjalnymi źródłami a celami ruchu metropolitalnego w obszarze Trójmiasta i w otoczeniu regionalnym;- określenie potencjału metropolitalnego;sformułowanie propozycji zapisów planu zagospodarowania przestrzennego obszaru metropolitalnego w formie zasad i kierunków działań.
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Gender wage gap convergence and skills heterogeneity in Poland (2005-2014) - quantile regression analysis based on microdata from EUSILC.
PublicationIn this article we quantify the magnitude and evolution of gender wage differentials in Poland over the years 2005 – 2014 using microlevel data from EU-SILC database (Statistics on Income and Living Conditions). In the study gender wage gap is examined through quantile regression analysis. It is shown that the gender wage gap varies along the wage distribution with workers’ skills heterogeneity playing a role. Additionally, the...
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Characterization of various drinking waters by new potentiometric taste sensor with lipid, lipid-like polymer membranes
PublicationA new sensing system comprising five all-solid-state electrodes with lipid, lipid like-polymer membranes was applied for rapid qualitative and quantitative analysis of various drinking waters. The results elaborated by chemometric methods revealed sensitivity to CO2 content in drinking water, suggesting that this sensing system could be used as a taste sensor. The ability of taste sensor to perform quantitative analysis of minerals...
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In Vitro Biological Characterization of Silver-Doped Anodic Oxide Coating on Titanium
PublicationDespite the high biocompatibility and clinical effectiveness of Ti-based implants, surface functionalization (with complex osteointegrative/antibacterial strategies) is still required. To enhance the dental implant surface and to provide additional osteoinductive and antibacterial properties, plasma electrolytic oxidation of a pure Ti was performed using a nitrilotriacetic acid (NTA)-based Ag nanoparticles (AgNP)-loaded calcium–phosphate...
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Protective and Suppressing Electromagnetic Interference Properties of Epoxy Coatings Containing Nano-Sized NiZn Ferrites
PublicationNano-crystalline ferrites with the chemical formula NixZn(1−x)Fe2O4, where x = 0, 0.2, 0.4, 0.6, 0.8, 1.0, were synthesized using a co-precipitation method. The obtained ferrites were investigated by X-ray diffraction (XRD). The corrosion inhibiting behavior of nano-sized ferrites was tested using carbon steel samples and 10% aqueous ferrite extracts. Results were compared with previous data obtained for micro-sized ceramic ferrites....
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Utilization of shale cuttings in production of lightweight aggregates
PublicationThe development of technologies for unconventional hydrocarbon exploration requires designing procedures to manage drilling waste that are consistent with the waste management hierarchy. In view of this, the possibility to apply shale drill cuttings as a prospective additive (replacing bentonite) to fly ash used for the production of lightweight aggregates (LWAs) was investigated. Moreover, a facile, waste-free method of LWAs production...
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SILICA AEROGEL TOWARDS ANODES FOR LITHIUM-ION BATTERIES
PublicationAn increasing demand for electrochemical energy storage and conversion devices stimulates progress in research on electrode and electrolyte materials. In the field of electrodes materials, silicon is the one of the most promising anode materials for Li-ion batteries. However silicon has the drastic volume variation (around 3 times lower on extraction) during insertion and extraction of lithium ions. As an alternative, nanocomposites...
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Metody oceny wyników usprawniania działalności operacyjnej (przykład zasto-sowań)
PublicationArtykuł omawia warunki, jakie należy spełniać przy doborze miar i procesie dokonywania pomiaru efektów usprawniania działalności operacyjnej. Prezentuje metody oceny wyników działalności operacyjnej, wśród których znaczące miejsce ma zdolność produkcyjna, produktywność, przepustowość i skuteczność. Wskazuje również na potrzebę powiązania miar z celami całego przedsiębiorstwa.
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Analysis of AC/DC/DC Converter Modules for Direct Current Fast-Charging Applications
PublicationThe paper is a comprehensive laboratory comparison study of two galvanic isolated solution off-board battery chargers: (1) Si-based cost-effective case, and (2) SiC-bidirectional ready for vehicle to grid concept case. All circuits are modular, and in both cases the DC/DC converter can be replaced according to the end user requirements (the coupled transformer remains the same and is constructed based on 12xC100 cores to avoid...
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Stan czystości jezior na terenie województwa Pomorskiego = Water quality of the lakes in the Pomerania Province
PublicationW ramach części doświadczalnej pracy przeprowadzono analizę jakości wód z wybranych jezior. Wykonano analizy nastepujących parametrów: pH, NO3-, NO2-, F-, NH4+, Cl-, HS-, SO42-, Fecal, Mn2+, PO43-, SiO2, Al3+. Dla wybranych próbek zmierzono również parametr toksyczności. W przypadku dwóch próbek jego wysokość wskazywała na to, że badana woda zawierała substancje toksyczne. Na podstawie uzyskanych wyników badane próbki wody pochodzące...
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MRAS-Based Switching Linear Feedback Strategy for Sensorless Speed Control of Induction Motor Drives
PublicationThis paper presents a newly designed switching linear feedback structure of sliding mode control (SLF-SMC) plugged with an model reference adaptive system (MRAS) based sensorless fieldoriented control (SFOC) for induction motor (IM). Indeed, the performance of the MRAS depends mainly on the operating point and the parametric variation of the IM. Hence, the sliding mode control (SMC) could be considered a good control alternative...
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Influence of controlled crystallization and SrF2 content on the structure and properties of Eu3+ doped phosphate glasses
PublicationNew phosphate glasses and glass-ceramics P2O5–Bi2O3–K2O–Nb2O5-SrF2 doped with Eu were synthesized and studied in this work. The influence of the SrF2 content (0–15 mol%) and the parameters of the heat treatment on their structural and optical properties were investigated. For the above purpose, the structural characterization by FTIR spectroscopy and XRD measurements was carried out, which showed a significant effect of SrF2 on...
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An Influence of Factors of Flow Condition, Particle and Material Properties on Slurry Erosion Resistance
PublicationThe degradation of materials due to slurry erosion is the serious problem which occurs in the power industries. The paper presents actual knowledge about an influence of individual factors connected with flow conditions, particles and material properties on the slurry erosion resistance. Among the factors connected with operating conditions, an influence of impact angle, and velocity of impact, particle concertation and liquid...
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QUASI-DISTRIBUTED NETWORK OF LOW-COHERENCE FIBER-OPTIC FABRY-PÉROT SENSORS WITH CAVITY LENGTH-BASED ADDRESSING
PublicationDistributed measurement often relies on sensor networks. In this paper, we present the construction of low coherent fiber-optic Fabry-Pérot sensors connected into a quasi-distributed network. We discuss the mechanism of spectrum modulation in this type of sensor and the constraints of assembly of such sensors in the network. Particular attention was paid to separate the signals from individual sensors, which can be achieved by...
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Electrochemical impedance studies of AB5 -type hydrogen storage alloy
PublicationDo wyznaczenia własności stopu AB5 wykorzystano elektrochemiczną spektroskopie impedancyjną. Badania impedancyjne wykonano podczas chronowoltamperometri cyklicznej oraz cykli ładowania i rozładowania elektrody. Interpretacja uzyskanych w trybie potencjostatycznym wyników pozwoliła na dalszą interpretacje wyników uzyskanych w trybie galwanostatycznym. Proponowana metodologia umożliwia śledzić parametry elektryczne badanego układu...
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Przeprowadzenie prób obejmujących miernictwo i charakteryzację opracowanych elementów, przyrządów i prototypowych podukładów funkcjonalnych zgodnie z obowiązującymi normami - zadanie 4. projektu ''Nowe technologie na bazie węglika krzemu i ich zastosowania w elektronice wielkich częstotliwości, dużych mocy i wysokich temperatur''
PublicationPrzedstawionmo główne cele zadania 4. projektu zamawianego nt. ''Nowe technologie na bazie węglika krzemu i ich zastosowania w elektronice wielkich częstotliwości dużych mocy i wysokich temperatur. Są to: analiza właściwości produkowanych obecnie komercyjnych elementów i przyrządów półprzewodnikowych z SiC oraz przygotowanie stanowisk laboratoryjnych do pomiarów parametrów i chrakterystyk tych przyrządów.Przewidywane jest opracowanie...
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The influence oil additives on spread cracks in silicon nitride
PublicationThe paper presents an experimental study of the influence of oil additives (Cl, S, P, cerium dioxide (CeO2)) on spread cracks in silicon nitride. The additives Cl, S, P are bound in molecules in liquid form soluble in the base oil. The CeO2 is purely in powder form in suspension. The use of CeO2 powder was made based on the good results of polishing of silicon nitride. A ceramic angular contact ball bearing was modelled using a...