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A method of two-terminal excess noise measurement with a reduction of measurement system and contact noise
PublicationPrzedstawiono metodę i system do pomiaru szumów nadmiarowych dwójników elektrycznych ze znaczną redukcją wpływu szumów własnych systemu pomiarowego i szumów kontaków. Proponowana metoda może byc zastosowana do pomiaru szumów elementów z wyprowadzonymi końcówkami, bądź też struktur, gdy jako wzorcowy szum odniesienia może zostać zastosowany szum struktury rezystywnej wytworzonej bezpośrednio na strukturze w otoczeniu elementu testowanego.
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Evaluation, Pitfalls and Recommendations for the “Water Layer Test” for Solid Contact Ion‐selective Electrodes
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Study of thermal property changes of biopol/polyamide 11 blends during biodegradation in compost.
PublicationPrzeprowadzone badania dotyczą zmian struktury krystalicznej podczas biodegradacji mieszanin polimerowych z udziałem PHBV, gdzie zależność między strukturą a podatnością na biodegradację związane są nie tylko ze stopniem krystaliczności PHBV ale także z budową faz składników mieszaniny. Wyniki pozwalają stwierdzić, że mieszaniny PA11/PHBV zawierające 60% kopoliestru PHBV(otrzymane przy użyciu wytłaczarki dwuślimakowej) charakteryzują...
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A tribological research on a reciprocating sliding contact of aluminum-ferrous composite against cast-iron.
PublicationOpisano badania kompozytów: silumin AlSi11-żelazo albo silumin AlSi11-stal narzędziowa N9 (otrzymanych in situ), a także samego siluminu AlSi11 w skojarzeniu z żeliwem 350, przy tarciu ślizgowym w ruchu posuwisto-zwrotnym. Stwierdzono wpływ sposobu otrzymywania materiału kompozytowego na zużycie i opory ruchu skojarzenia badawczego, w szczególności materiały te zużywały się wolniej, niż silumin AlSi11.
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Badania dynamicznych przebiegów ciśnienia w pompach wyporowych z wykorzystaniem czujników piezoelektrycznych
PublicationW artykule przedstawiono wyniki badań przebiegów ciśnień w pompie zębatej i wielotłoczkowej, przeprowadzonych z wykorzystaniem piezoelektrycznych czujników ciśnienia. Przedstawione wyniki są efektem realizowanych prac badawczo-rozwojowych na Politechnikach Gdańskiej oraz Wrocławskiej.
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Continuum contact model for friction between graphene sheets that accounts for surface anisotropy and curvature
PublicationUnderstanding the interaction mechanics between graphene layers and co-axial carbon nanotubes (CNTs) is essential for modeling graphene and CNT-based nanoelectromechanical systems. This work proposes a new continuum contact model to study interlayer interactions between curved graphene sheets. The continuum model is calibrated and validated using molecular dynamics (MD) simulations. These are carried out employing the reactive...
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Badania kompensacji i rozrządu w pompach i silnikach satelitowych typu SM
PublicationW laboratorium Katedry Hydrauliki i Pneumatyki prowadzone są badania rozwojowe nowego typu silników i pomp satelitowych SM o bardzo małej geometrycznej objętości roboczej, od 5 do 73 cm3/obr. Prace te są realizowane w ramach projektu badawczo-rozwojowego nr R0300103. Opisane w artykule prace badawcze miały na celu udoskonalenie konstrukcji tych maszyn, szczególnie zespołu kompensacji luzów osiowych oraz odpowiednie dobranie średnic...
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Localized impedance measurements of AA2024 and AA2024-T3 performed by means of AFM in contact mode
PublicationPurpose: The purpose of this paper is to present the results of an atomic force microscopy (AFM) based approach to local impedance spectroscopy (LIS) measurement performed on AA2024 and AA2024-T3 aluminium alloys. Design/methodology/approach: AFM-LIS measurements were performed ex-situ without the electrolyte environment, so in fact the electrical not electrochemical impedance was obtained. Findings: Relative local impedance values...
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Implementation and Validation of Multisinusoidal, Fast Impedance Measurements in Atomic Force Microscope Contact Mode.
PublicationThis study presents a novel approach to impedance measurements. The methodology discussed is limited to contact in the sample-probe system under ambient conditions without the presence of electrolyte. Comparison with results of direct and alternating current measurements for well-defined metallic surfaces are made. In spite of idealization related to the type of contact examined, the proposed technique provides an improvement of...
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Morphology of damage inflicted on brittle polymer in lubricated contact under cyclic static load
PublicationIn this article morphology of damage inflicted on the polymethylmethacrylate (PMMA) plate in static point lubricated contact with a ball made of five different materials under cyclic normal load has been presented. It is argued that the counterface material and lubricating film play an important role in the damage process and the extent of damage inflicted in the PMMA plate.
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Sessile droplet contact angle of water–Al2O3, water–TiO2 and water–Cu nanofluids
PublicationThis work presents measurements of the contact angle of sessile droplets for three nanofluids, i.e. water–Al2O3, water–TiO2 and water–Cu. The plates made of glass, anodized aluminium and stainless steel of different roughness served as substrates. Ultrasonic vibration was used for 30–60 min in order to stabilise the dispersion of the nanoparticles. Nanoparticles were tested at the concentration of 0.01%, 0.1%, and 1% by weight....
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Algorithm for Automatic Wear Estimation of Railway Contact Strips Based on 3D Scanning Results
PublicationElectric rail vehicles use current collection system which consists of overhead contact line and a current collector (pantograph) mounted on the roof of a vehicle. A pantograph is equipped with contact strips, which slide along the contact wire, ensuring steady electric contact. Contact strips are made of carbon layer, fixed to an aluminum carrier. The carbon layer wears down due to friction. Using overly worn contact strips increases...
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Photoelectrochemical properties of BIMEVOX (ME=Cu, Zn, Mn) electrodes in contact with aqueous electrolyte
PublicationLayered oxide Bi4O2O11 and mixed oxides of bismuth, vanadium and a third metal (ME = Cu, Zn, Mn) were synthesized and characterized using XRD, Raman and SEM. The energy band gap (Eg) of samples determined using UV–VIS reflectance spectra equals to 2.46, 2.34, 2.27 and 2.18 eV for Bi4V2O11, BICUVOX (Bi2V1 − xCuxO5.5 − 3x/2), BIZNVOX (Bi2V1 − xZnxO5.5 − 3x/2) and BIMNVOX (Bi2V1 − xMnxO5.5 − x/2) (x = 0.1), respectively. Open circuit...
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3D Machine Vision System for Inspection of Contact Strips in Railway Vehicle Current Collectors
PublicationConstruction and technical condition of current collectors is crucial to reliability and safety of railway transportation. According to the Technical Specifications for Interoperability railway vehicles in the European Union should be equipped with carbon contact strips. Excessive wear or defects of contact strips degrade the capability of undisturbed power transmission, cause faster wear of contact wire, and can even result in...
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COOPERATION BETWEEN UNIVERSITY AND EXTERNAL COMPANY IN ARCHITECTURAL INVENTORY USING INNOVATIVE MEASURING TECHNOLOGY
PublicationArchitectural inventories are the main field for using innovative technology ( remote sensing). The main purpose of using ie. Laser scanning or photogrammetry is to capture all of the important details of structure. Regarding the extents of inventory works, it may only apply to external details, such as facades, supporting structures and surroundings, whilst in terms of advanced inventory, the building's interior is also expected...
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Structure of the US investment company industry over the period 2000 to 2017: substitution analysis
PublicationOver the last years the investment company industry has undergone deep transformation in the majority of the most advanced economies, including the United States. Traditional investment companies, such as mutual funds, have lost their market share to innovative exchange-traded funds (ETFs). The main distinctive features of ETFs are listing and trading in their units on the stock exchanges as well as lower costs for investors. The...
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"Born Poland, Gone Global". The case of successful Polish ICT company - Aiton Caldwell
PublicationThis work examines the pathway to global markets of Polish ICT company Aiton Caldwell
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SESSILE DROPLET CONTACT ANGLE OF WATER-Al2O3, WATER-TiO2 AND WATER-Cu NANOFLUIDS
PublicationThe goal of the present work was the experimental determination of the contact angle of droplets of three nanofluids on various substrates. Of particular interest was effect of nanoparticle concentration on droplet contact angle.
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Tax Evasion, Tax Morale, and Trade Regulations: Company-Level Evidence from Poland
PublicationObjective: To investigate the determinants of the phenomenon of evading taxes among polish entrepreneurs. In particular, I examine such factors as tax administration satisfaction, tax morale, tax burden, and the influence of trade regulations. Research Design & Methods: A survey study conducted in 2017 in Poland among 454 enterprises. I used the zero-inflated negative binomial modelling technique to examine the impact of factors...
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A miniaturized solid-contact potentiometric multisensor platform for determination of ionic profiles in human saliva
PublicationThis paper describes a miniaturized multisensor platform (MP-ISES) consisting of electrodes: a reference one (RE) and ion-selective electrodes (ISEs) for monitoring Na+, K+, Ca2+, Mg2+, Cl−, and SCN− ions and pH in human saliva. Gold electrode surface was modified by deposition of two layers: electrosynthesized PEDOT:PSS forming an intermediate layer, and ion-selective membrane. The developed ISEs were characterized by a wide linear...
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Public Perception of Digital Contact Tracing App and Implications for Technology Acceptance and Use Models
PublicationGovernments are increasingly adopting digital contact tracing applications (DCT) as a key component of their response to the COVID-19 pandemic. However, governments are struggling to achieve widespread adoption of DCT necessary for obtaining the expected individual and public benefits associated with its use. Consequently, studies on DCT have focused on the barriers to DCT adoption in different contexts and possible ways of overcoming...
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Study of Phase Transitions Occurring in a Catalytic System of ncFe-NH3/H2 with Chemical Potential Programmed Reaction (CPPR) Method Coupled with In Situ XRD
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Application of dynamic headspace and gas chromatography coupled to mass spectrometry (DHS-GC-MS) for the determination of oxygenated volatile organic compounds in refinery effluents
PublicationThe paper presents a new procedure for the determination of oxygenated volatile organic compounds (O-VOCs) in postoxidative effluents from the production of petroleum asphalt using dynamic headspace coupled to gas chromatography-mass spectrometry in the selected ion monitoring (SIM) mode (DHSGC-MS). Among the GC capillary columns tested, a polar SLB-IL111 column with the ionic liquid stationary phase was found to be superior due...
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Lead-free bismuth-based perovskites coupled with g–C3N4: A machine learning based novel approach for visible light induced degradation of pollutants
PublicationThe use of metal halide perovskites in photocatalytic processes has been attempted because of their unique optical properties. In this work, for the first time, Pb-free Bi-based perovskites of the Cs3Bi2X9 type (X = Cl, Br, I, Cl/Br, Cl/I, Br/I) were synthesized and subjected to comprehensive morphological, structural, and surface analyses, and photocatalytic properties in the phenol degradation reaction were examined. Furthermore,...
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Comprehensive thermodynamic analysis of the CAES system coupled with the underground thermal energy storage taking into account global, central and local level of energy conversion
PublicationA key aspect of CAES is the optimal configuration of the thermodynamic cycle. In this paper, the situation of cooperation between the current conventional power plants and wind farms is analyzed, and then, based on thermodynamic models, the process of storing thermal and electrical energy in the CAES system coupled with a heat storage and recovery is developed. Therefore, three levels can be distinguished, namely: the global level...
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Determination of non-steroidal anti-inflammatory drugs in natural waters using off-line and on-line SPE followed by LC coupled with DAD-MS
PublicationOpisano dwie metody pozwalające na jednoczesne oznaczanie zawartości niesterydowych leków przeciwzapalnych (difluisal, diklofenak, naproksen, tolmetin, fenoprofen, ibuprofen) w próbkach wodnych. Próbki przygotowywano do analizy z użyciem techniki ekstrakcji do fazy stałej (off-line i on-line). Natomiast oznaczeń końcowych dokonano z użyciem LC-DAD-MS. Sprawdzono kilka różnych kolumienek ekstrakcyjnych i wybrano RP-18 jako najlepsze...
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A constitutive model for concrete based on continuum theory with non-local softening coupled with eXtended Finite Element Method. Computational Modelling of Concrete Structures,
PublicationArtykuł omawia model połączony ciągły-nieciągły do modelowania stref lokalizacji i rys w betonie niezbrojonym. Obliczenia wykonano stosując rozszerzoną metodę elementów skończonych. Wyniki numeryczne porównano z doświadczeniami.
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Towards the Application of Structure-Property Relationship Modeling in Materials Science: Predicting the Seebeck Coefficient for Ionic Liquid/Redox Couple Systems
PublicationThis work focuses on determining the influence of both ionic liquid (IL) type and redox couple concentration on Seebeck coefficient values of such a system. The quantitative structure property relationship (QSPR) and read-across techniques are proposed as methods to identify structural features of ILs (mixed with LiI/I2 redox couple), which have the most influence on the Seebeck coefficient (Se) values of the system. ILs consisting...
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Michał Tomasz Kucewicz dr
PeopleMichal Kucewicz was born in 1986 in Gdansk. In 2005 he completed International Baccalaureate programme in Topolowka (III High School in Gdańsk). Thanks to the G. D. Fahrenheit scholarship, he moved to the United Kingdom to study neuroscience. He received his Bachelor’s and Master’s degree from the Cambridge University, and his doctoral degree from the University of Bristol specializing in electrophysiology of memory and cognitive...
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Measurement spectrum obtained with the use of ZnO coated microsphere-based fiber-optic sensor - 100 Celsius degrees
Open Research DataApplication of a microsphere-based fiber-optic sensor with 200 nm zinc oxide (ZnO) coating, deposited by Atomic Layer Deposition (ALD) method, for temperature measurements between 100°C and 300°C, is presented. The main advantage of integrating a fiber-optic microsphere with a sensing device is the possibility of monitoring the integrity of the sensor...
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Measurement spectrum obtained with the use of ZnO coated microsphere-based fiber-optic sensor - 130 Celsius degrees
Open Research DataApplication of a microsphere-based fiber-optic sensor with 200 nm zinc oxide (ZnO) coating, deposited by Atomic Layer Deposition (ALD) method, for temperature measurements between 100°C and 300°C, is presented. The main advantage of integrating a fiber-optic microsphere with a sensing device is the possibility of monitoring the integrity of the sensor...
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Measurement spectrum obtained with the use of ZnO coated microsphere-based fiber-optic sensor - 110 Celsius degrees
Open Research DataApplication of a microsphere-based fiber-optic sensor with 200 nm zinc oxide (ZnO) coating, deposited by Atomic Layer Deposition (ALD) method, for temperature measurements between 100°C and 300°C, is presented. The main advantage of integrating a fiber-optic microsphere with a sensing device is the possibility of monitoring the integrity of the sensor...
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Measurement spectrum obtained with the use of ZnO coated microsphere-based fiber-optic sensor - 120 Celsius degrees
Open Research DataApplication of a microsphere-based fiber-optic sensor with 200 nm zinc oxide (ZnO) coating, deposited by Atomic Layer Deposition (ALD) method, for temperature measurements between 100°C and 300°C, is presented. The main advantage of integrating a fiber-optic microsphere with a sensing device is the possibility of monitoring the integrity of the sensor...
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John Benjamins Publishing Company
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Institutional Settings and their Impact on the IPO Activity: An Exploratory Study Based on Qualitative Modelling
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Wheat Bread with Grape Seeds Micropowder: Impact on Dough Rheology and Bread Properties
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Multiplication Analysis of the Cause, Form and Extent of Damage to Buildings in Areas with Mining Impact
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Interdisciplinary risk analysis of construction investment and property value in the areas with mining impact
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Impact of Mining Exploitation on Properties with Engineering Structures by Local Urban Development Plans
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The impact of cytogenetic evolution and acquisition of del(17p) on the prognosis of multiple myeloma patients
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The financial impact of urbanization costs in Poland at municipality level – the case of Wrocław city
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Issue of Assessment of the Strong Electromagnetic Pulses Impact on the Functioning of Selected Electronic Devices
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Patterns of synthetic cathinones use and their impact on depressive symptoms and parafunctional oral behaviors
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Determination of Safety Levels of Electronic Devices Exposed to Impact of Strong Electromagnetic Pulses
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The Reliability and Operational Analysis of ICT Equipment Exposed to the Impact of Strong Electromagnetic Pulses
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The Issue of Operating Security Systems in Terms of the Impact of Electromagnetic Interference Generated Unintentionally
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Grazing bifurcation and chaotic oscillations of vibro-impact systems with one degree of freedom
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Impact and pitfalls of scaling of left ventricular and atrial structure in population-based studies
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The impact of declining oxygen conditions on pyrite accumulation in shelf sediments (Baltic Sea)
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Comparison of numerical models of impact force for simulation of earthquake-induced structural pounding
PublicationW artykule przedstawiono porównanie trzech modeli numerycznych służących do symulacji siły zderzenia w czasie kontaktu pomiędzy konstrukcjami budowlanymi podczas trzęsień ziemi. Efektywność każdego z modeli zbadano porównując wyniki analiz numerycznych z wynikami badań eksperymentalnych. Wyniki pracy pokazują, iż nieliniowy model lepkosprężysty najdokładniej symuluje przebieg czasowy siły zderzenia w czasie kontaktu.