2018 - Publications Repository - Gdańsk University of Technology

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Publications from the year 2018

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Nanotubular oxide layers and hydroxyapatite coatings on porous titanium alloy Ti13Nb13Zr
- Milena Supernak-Marczewska
- Agnieszka Ossowska
- Paulina Strąkowska
- Andrzej Zieliński
2018 Full text Advances in Materials Science
The surface condition of an implant has a significant impact on response occurring at the implant-biosystem border. The knowledge of physical-chemical and biological processes allows for targeted modification of biomaterials to induce a specified response of a tissue. The present research was aimed at development of technology composing of obtaining the nanotube oxide layers on a porous titanium alloy Ti13Nb13Zr, followed by the deposition of phosphate coating. The porous substrate (porosity about 50%) was prepared by a selective laser melting of the Ti13Nb13Zr powder with the SLM Realizer 100 equipment. The nanotubular oxide layers were fabricated by electrochemical oxidation in H3PO4 + 0.3% HF mixture for 30 min. at a constant voltage of 20V. The calcium phosphate coatings were formed by the electrochemically assisted deposition (ECAD). The presence of nanotubular oxide layers with their internal diameters ranging from 30 to 100 nm was observed by SEM (JEOL JSM-7600F). The nanotubes have dimensions that facilitated the deposition of hydroxyapatite
Naprężenia i odkształcenia podkładów podłogowych na bazie siarczanu wapnia warunkujące występowanie przerw dylatacyjnych
- Marzena Kurpińska
- Aldona Wcisło
2018
Artykuł stanowi kompendium wiedzy z zakresu stosowania anhydrytowych podkładów podłogowych, wytycznych co do wyznaczania przerw dylatacyjnych oraz przyczyn powstawania ewentualnych spękań.
Natural convection in symmetrically heated vertical channels
- Witold Lewandowski
- Michał Ryms
- Hubert Denda
2018 Full text INTERNATIONAL JOURNAL OF THERMAL SCIENCES
The study describes natural convection through a vertical channel, open on four sides and bound by two isothermal walls. Both balancing and infrared experimental investigations were performed in air (Pr = 0.71) to estimate the impact of channel width s and wall-to-ambient temperature difference (tw - t∞) on natural convective heat transfer, the formation of air flow patterns and the rate of flow pattern formation. The study was conducted on two parallel vertical plates of height H = 0.5 m and width B = 0.25 m, with the heated surfaces facing each other, thus creating peripherally open channels of different widths s = 0.045, 0.08, 0.180 and ∞ m. The surface temperature tw, identical for both heating plates, was changed every 10 K and set at tw = 40, 50, 60, 70 and 80 °C, while the ambient temperature was maintained within the 18–25 °C range. In the balance method, heat fluxes were determined based on measurements of voltage and electric current supplying the heaters placed inside the walls. In the gradient method, the heat fluxes were calculated from the temperature distribution in air, within a plane perpendicular to the heating plate surfaces. Temperature fields were visualized using a plastic detecting mesh and a thermal imaging camera. The distribution of temperature tx,y, and its gradient at the walls dt/dx|x=0,y were obtained at different heights y along the channels. The gradient values obtained and the results, presented as dependencies of the Nusselt number on the Rayleigh number, indicate that the channel width has a significant impact on heat transfer. Compared to the vertical plate s = ∞, the following levels of convective heat transfer enhancement were observed: 29.5% (s = 0.045 m), 38.8% (s = 0.085 m) and 61.6% (s = 0.180 m).
Natural ventilation performance of family building in cold climate during windless time
- Romana Antczak-Jarząbska
- Maciej Niedostatkiewicz
2018 Full text Diagnostyka
In this paper, the field measurements results are presented on the stack ventilation effect. The paper presents the results of performance (air change rate ACH) natural ventilation for building with inlet gap measured for the transitional season (between heating and summer season). The measurements were performed during a windless time. The house was located in northern Poland, in a cold climate region. The measurement system measured local climate conditions, indoor climate conditions and air velocities in vent inlet and outlet. In this paper, the discharge coefficient was checked. The discharge coefficient of 0.83 was higher than the discharge coefficient of 0.6 which was usually assumed for small rectangular openings during the natural ventilation. In a wind absence when the stack effect acted only, the air change rate (ACH) slightly exceeded the standard minimum value
Natural ventilation performance of family building in cold climate during windy days
- Romana Antczak-Jarząbska
- Maciej Niedostatkiewicz
2018 Full text Diagnostyka
Adequately designed natural ventilation is the cheapest and easiest way to effectively remove indoor pollutants and keep the fresh air inside a building. A prediction of performance and effectiveness of ventilation in order to determine the design of a ventilation system can provide real and long term cost savings. The paper presents results of performance (air change rate ACH) and effectiveness (CO2 concentration in the breathing zone and temperature distribution ) of natural ventilation for a building with inlet gap measured for the transitional season (between the heating and the summer season). The measurements were performed during a windy period. The test apartment was located in cold climate. The measurement system measured local climate conditions, indoor climate conditions and air velocities in both vent inlet and outlet.
Nauki o jakości - ich miejsce i znaczenie w klasyfikacji dziedzin i dyscyplin naukowych oraz praktyce gospodarczej
- Piotr Przybyłowski
- Piotr Grudowski
2018 Problemy Jakości
W artykule przedstawiono ważne w kontekście trwającej obecnie dyskusji dotyczącej nowego wykazu dziedzin i dyscyplin naukowych, akcentowane w środowisku polskich badaczy zajmujących się problematyką jakości, argumenty i uwarunkowania uzasadniające potrzebę wyodrębnienia nauk o jakości.
NetBaltic System-Heterogenous Wireless Network for Maritime Communications
- Michał Hoeft
- Krzysztof Gierłowski
- Jacek Rak
- Józef Woźniak
2018 Full text Polish Maritime Research
In case of maritime communications, we observe a growing interest in deployment of multitask satellite-based solutions and development of new maritime-specific systems intended for improvements in safety of e-navigation. Analysis of different types of currently used maritime communication systems leads, however, to a conclusion that neither global and still very expensive satellite systems nor cheaper, but short-ranged transmission technologies can, on their own, fully meet the today's expectations and quality requirements formulated for broadband maritime systems. This lack of reliable solutions, offering high throughput and ubiquitous availability of coverage to a wide audience at a relatively low price is one of the main barriers in a widespread implementation of e-navigation initiatives. This issue is addressed in the netBaltic project with the objective to design, deploy and validate in a real maritime environment a non-satellite wireless communication system enabling ship-to-ship and ship-to-shore information exchange via a multi-hop network composed of onshore base stations, maritime vessels and other transit elements such as buoys. In the paper, the idea of a heterogeneous wireless maritime system is presented. Details of the proposed netBaltic node architecture are described highlighting the solutions introduced in the project as a response to specific maritime communication requirements. Numerical results of communication area coverage are presented for four different scenarios utilizing different wireless transmission technologies. In particular, they indicate that when using appropriate wireless communication solutions, the number of vessels being able to connect to Internet is significantly increased as compared to traditional wireless systems (capable of one-hop communication) from 14% for short-range transmission technologies up to as high as 127% in case when relatively long-range transmission technologies are employed within the system.
Networkig activities of general judiciary - from theory to practice
- Przemysław Banasik
- Sylwia Morawska
- Monika Odlanicka-Poczobutt
2018 Full text e-mentor
Over the last three decades, networks - as a field of research - have acquired a significant place among management sciences. Unfortunately, in the judiciary they have become a subject of more careful analyses only recently, which resulted in a large discrepancy of knowledge - both in theory and in its practical adaptation for the needs of the courts. In order to fill this cognitive gap, an attempt was made to identify levels of organizational maturity of common courts in applying a network form of coordination to auxiliary activity. The basis material for the research was provided in 72 interviews with presidents and court heads, and observations of a non-standardized process of information exchange and knowledge sharing within the voluntary court network established during the implementation of the project hosted by the National School of Judiciary and Prosecutor's Office (Krajowa Szkoła Sądownictwa i Prokuratury) "Education in time management and court proceedings costs - case management" ("Edukacja w dziedzinie zarządzania czasem i kosztami postępowań sądowych - case management"). 60 regional, district and appeal courts from different appeals cooperated horizontally within the scope of this network. During the project, organizational and management solutions were implemented, such as: improvement of case flow management and efficiency of proceedings, development of effective information policy of courts and management of internal and external communication. As part of the exchange of information and knowledge sharing, the courts used the network form of coordination. The procedure proposed in this article designates five levels of organizational maturity of courts in the implementation of the network form of coordination. The developed procedure can be used to track the progress in the common courts' networking and to inspire the courts to use this form of coordination in practice.
Networks Externalities as Social Phenomenon in the Process ICT Diffusion.
- Ewa Lechman
2018 Full text Economics & Sociology
This paper is designed to fill the gap in knowledge that we have identified regarding the process of diffusion of information and communication technologies and emerging network effects that significantly enhance spread of these technologies. We contribute to the present state of the art by examining the process of ICT diffusion in 50 countries, which in 2015 achieved highest ICT penetration rates.
New approach for e-cigarette aerosol collection by an original automatic aerosol generator utilizing melt-blown non-woven fabric
- Justyna Aszyk
- Paweł Kubica
- Jacek Namieśnik
- Agata Kot-Wasik
- Andrzej Wasik
2018 Full text ANALYTICA CHIMICA ACTA
Currently, there is lack of standardized conditions for the collection and analysis of e-cigarette (EC) aerosol. Considering the urgent need for the development of these guidelines, a procedure for EC aerosol analysis was developed. A novel automatic e-cigarette aerosol generator was designed. For the first time, melt-blown non-woven fabric was applied for the effective uptake of compounds released from vaporized e-liquid. The extraction procedure was optimized in terms of type of extraction solvent, amount of sorbent and solvent volume. For optimization, a model e-liquid containing flavour additives belonging to various chemicals group with various chemical properties was investigated. The aerosol trapping efficiency was satisfactory and was equal to 92 ± 7%. Final determination was performed by GC-MS/MS. Quantitation was based on the mass change tracking approach (MCT), which assumes the monitoring of e-liquid mass changes before and after vaping. The combination of non-woven fabric and sampling approach (MCT) was proven to be effective in acquisition of reliable data. Thus, the concentrations in aerosol and emission factors were calculated for aerosols collected during the vaping of both model e-liquids and real samples. Validation was performed by evaluating key analytical parameters, such as linearity, accuracy, precision, limit of detection (LOD) and quantitation (LOQ). For all investigated compounds, recoveries from 70% to 118% together with precision and reproducibility below 12% were achieved. The applicability of the described approach was examined by analysing EC refill solutions commercially available on the Polish market.
New concept and analysis of the multicell piezoelectric motor
- Roland Ryndzionek
2018
This work presents the design, modeling and tests of the prototype multicell piezoelectric motor (MPM). A new concept of the electromechanical structure of the considered prototype is based on three rotating-mode actuators. The electromechanical structure of each actuator has been considered as an independent one - referred to as a ”single cell” (single actuator). Combined three resonant actuators generate three traveling waves which as a result improve the stability and performance of the MPM. The results of research carried out using analytical, simulation and experimental methods cover the torque vs. speed characteristics of the prototype MPM.
New Concept of Numerical Ship Motion Modelling for Total Ship Operability Analysis by Integrating Ship and Environment Under One Overall System
- Henryk Olszewski
- Mohammad Hossein Ghaemi
2018 Full text Polish Maritime Research
The paper presents a new concept of overall ship motion modelling for application to total ship operability. The delivered model is a multi-phase and includes both submerged part of ship’s hull and the surrounding water as a unique body. The Discrete Finite Element Method is applied. The model is successfully examined and illustrated for a selected AHTS.
New data acquisition system for birch sap concentrate production using the reverse osmosis technology
- Jarosław Wawer
- Maciej Bilek
- Sosnowski Stanisław
2018 Econtechmod. An International Quarterly Journal on Economics of Technology and Modelling Processes
The work presents a simple electronic device that helps to monitor the basic parameters of the reverse osmosis (RO) system during the concentration of birch tree sap. The construction costs are low (around 150 Euro) but the functionality of the device is high. It has an in-build two channel conductometer and can measure the volumetric flow rate of two streams of liquids. The collected data are transmitted wirelessly via Bluetooth to a PC computer. The new data acquisition system can help to monitor the work of RO apparatus in standard conditions or in the research and development works. It provides essential data for the process modeling and economic aspects analysis of birch sap concentrate production.
New Method for Increasing Precision of Position Estimation in Hybrid Inertial Navigation System
- Piotr Rajchowski
- Jacek Stefański
- Jarosław Sadowski
2018 Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne
In article new method for increasing precision of position estimation by using inertial navigation in hybrid localization system with reduced number of reference nodes for radio distance measurements was presented. Measuring campaign using developed measuring stand were carried out to verify precision of position estimation of moving person in indoor environment.
New model of cooperation between logistics center and maritime container terminal
- Adam Lewiński
2018 Full text
The following article presents the innovative concept of logistics centers called “port-centric logistics”, which finds close co-operation with maritime container port. This concept can reduce the costs of logistics operations. In the first part the author focuses on describing the specifics of logistics centers. The following parts include characteristic of “port-centric logistics” concept. The last part of the paper contains information about Pomeranian Logistics Center which is an example of functioning “port-centric logistics” concept in business environment.
New plasmonic platform for enhanced luminescence of Valrubicin
- Marcin Stanisław Łapiński
- Anna Synak
- Anna Gapska
- Piotr Bojarski
- Wojciech Sadowski
- Barbara Kościelska
2018 OPTICAL MATERIALS
Luminescence enhanced by new structure of plasmonic platform with aluminum oxide (Al2O3) buffer layer deposited on gold nanostructures is investigated. Regularly distributed gold nanostructures of average dimension of 50 nm formed the active part of plasmonic platforms. They were manufactured on Corning 1737 glass substrate by melting of gold thin film. The nanostructures were coated by dielectric Al2O3 thin film with thickness of 6 nm deposited by atomic layer deposition (ALD) method. Thin film of Valrubicin as a luminescence material was deposited on prepared substrates by spin-coating technique. Luminescence spectra show that designed plasmonic platform with Al2O3 thin film between gold nanostructures and Valrubicin enhanced fluorescence intensity by about 4.5 times.
New results on estimation bandwidth adaptation
- Maciej Niedźwiecki
- Marcin Ciołek
2018 Full text IFAC-PapersOnLine
The problem of identification of a nonstationary autoregressive signal using non-causal estimation schemes is considered. Noncausal estimators can be used in applications that are not time-critical, i.e., do not require real-time processing. A new adaptive estimation bandwidth selection rule based on evaluation of pseudoprediction errors is proposed, allowing one to adjust tracking characteristics of noncausal estimators to unknown and/or time-varying degree of signal nonstationary. The new rule is compared with the previously proposed one, based on the generalized Akaike’s final prediction error criterion.
New sample preparation strategies for comprehensive lipidomics of human breast milk
- Dorota Garwolińska
- Weronika Hewelt-Belka
- Jacek Namieśnik
- Agata Kot-Wasik
2018 Full text
GLOBAL PROFILING ANALYSIS OF HUMAN BREAST MILK (HBM) LIPIDS IS HINDERED BY COMPLEX COMPOSITION OF HBM. THIS PROBLEM IS HUGE FROM ANALYTICAL POINT OF VIEW, SINCE DUE TO THAT DETECTION OF ALL HBM LIPIDS DURING ONE ANALYTICAL RUN IS LIMITED. THUS, SAMPLE PREPARATION STEP CONSTITUTES A CRUCIAL STEP IN UNTARGETED LIPIDOMIC ANALYSIS OF HBM, ESPECIALLY WHEN SEMI-QUANTITATIVE ANALYSIS IS ASSUMED. HEREIN, WE PRESENT A COMPARISON OF PUBLISHED AND PROPOSED BY US SAMPLE PREPARATION PROCEDURES USED IN LIPIDOMIC STUDY OF HBM, INCLUDING INDICATION OF ADVANTAGES, DRAWBACKS AND POSSIBLE APPLICATION.
New thiourea organocatalysts and their application for the synthesis of 5-(1H-indol-3-yl)methyl-2,2-dimethyl-1,3-dioxane-4,6-diones a source of chiral 3-indoylmethyl ketenes
- Sławomir Makowiec
- Ewelina Najda-Mocarska
- Anna Zakaszewska
- Karolina Janikowska
2018 Full text SYNTHETIC COMMUNICATIONS
The stereoselective properties of modified thiourea organocatalysts were tested in the Friedel–Crafts alkylation of indole with 5-arylidene-2,2-dimethyl-1,3-dioxane-4,6-diones, which produces chiral 5-((1H-indol-3-yl)(aryl)methyl)-2,2-dimethyl-1,3-dioxane-4,6-diones. Based on a tentative reaction mechanism for ((S)-N-benzyl-2-(3-(3,5-bis (trifluoromethyl)phenyl)thioureido)-N,3,3-trimethylbutanamide organocatalysts, modifications were applied in four selected regions. Systematic structure-stereoselectivity relationship study allowed designing the best efficient organocatalyst for the investigated Friedel–Crafts alkylation of indole with 5-arylidene-2,2-dimethyl-1, 3-dioxane-4,6-diones
NIEKONWENCJONALNE BADANIA SKUTECZNOŚCI HAMOWANIA W STACJI KONTROLI POJAZDÓW
- Marcin Witkiewicz
- Mirosław Owczarz
- Stanisław Taryma
2018 Full text Autobusy. Technika, Eksploatacja, Systemy Transportowe
W artykule przedstawiono niekonwencjonalne badania skuteczności hamowania samochodu na stanowisku diagnostyczny. Na podstawie przeprowadzonych badań określono wpływ ciężaru samochodu na skuteczność hamowania. Dokonano analizy porównania zmierzonego wskaźnika skuteczności hamowania i rzeczywistego wskaźnika skuteczności hamowania dla różnego obciążenia samochodu użytego do badań.