2016 - Repozytorium publikacji - Politechnika Gdańska

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Publikacje z roku 2016

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The influence of nanostructures size on V2O5 electrochemical properties as cathode materials for lithium ion battery
- Marta Prześniak-Welenc
- Jakub Karczewski
- Smalc-koziorowska Julita
- Marcin Stanisław Łapiński
- Wojciech Sadowski
- Barbara Kościelska
2016 RSC Advances
In this paper, V2O5 nanostructures with a size depending on the annealing temperature are successfully synthesized by a sol-gel method. The crystal structure and morphology of samples are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), selected area electron diffraction (SEAD) and scanning electron microscopy (SEM), respectively. Electrochemical testing such as discharge–charge cycling (CD) and cyclic voltammetry (CV) are employed in evaluating their electrochemical properties as cathode materials for lithium ion battery. One-dimensional nanostructures are successfully synthesized with the same structure, composition and similar shape. Results reveal that for one-dimensional nanostructures, next to the thickness which must be as small as possible, the length of nanocrystals is crucial and should be above 2 µm. The longer nanostructures obtained at 650 °C deliver a discharge specific capacity of 281 mAh g-1 at a current rate of C/5 which is over 95.5% of the theoretical capacity for two Li+ ions intercalation (294 mAh g-1) within a voltage window of 2.0-4.0 V.
The influence of reinforcement on load carrying capacity and cracking of the reinforced concrete deep beam joint
- Anna Kopańska
- Krystyna Nagrodzka-Godycka
2016 ENGINEERING STRUCTURES
The paper presents the results of experimental research of the spatial reinforced concrete deep beam systems orthogonally reinforced and with additional inclined bars. Joint of the deep beams in this research was composed of the longitudinal deep beam with a cantilever suspended at the transversal deep beam. The cantilever deep beam was loaded throughout the depth and the transversal deep beam was loaded at the mid-span by longitudinal deep beam attached to it. Morphology of cracking and stresses in the reinforcing steel, as well as the load distribution in the cantilever deep beams using Strut-and-Tie model taking into account an effort of concrete compression strut and efficiency of softening coefficient are presented and discussed. In the paper, the effectiveness of the mixed reinforcement in both tested deep beam systems, as referred to the design recommendation proposed in the published papers is also verified. It is also demonstrated that the inclined reinforcement favorably influences the width of cracks in cantilever and transversal deep beams and ensures the increase of the load carrying capacity.
The Influence of the Chemical Composition of Selected Waste Materials from the Production of Copper on the Final Environmental Assessment
- Adam Bydałek
- Szymon Biernat
- Paweł Schlafka
- Mariusz Holtzer
- Waldemar Wołczyński
- Franciszek Adam Bydałek
2016 Pełny tekst ARCHIVES OF METALLURGY AND MATERIALS
This article presents qualitative and quantitative analysis of the waste produced by KGHM Polska Miedź. The waste has been analyzed according to its chemical composition and balanced in order to be reused and recycled. Special attention has been paid to mining industries producing the biggest amount of waste and ore enrichment businesses generating waste, which isn’t reused nowadays. Laboratory reseach has been conducted on floatation waste, different kinds of slags, waste gases and water slag extracts. Attention has been drawn to the possibility of using a computer program SLAG - PROP for analyzing physicochemical features, technological features and the refining of the acquired waste. Consequently, the further way of utilization of waste has been shown. From this point of view, analyses of DTA and TG slags in an oxide coating seem especially interesting. Having a particular composition they can be successfully utillised in the refining processes of copper pyrometallyrgy.
The instantaneous frequency rate spectogram
- Krzysztof Czarnecki
2016 MECHANICAL SYSTEMS AND SIGNAL PROCESSING
An accelerogram of the instantaneous phase of signal components referred to as an instantaneous frequency rate spectrogram (IFRS) is presented as a joint time-frequency distribution. The distribution is directly obtained by processing the short-time Fourier transform (STFT) locally. A novel approach to amplitude demodulation based upon the reassignment method is introduced as a useful by-product. Additionally, an estimator of energy density versus the instantaneous frequency rate (IFR) is proposed and referred to as the IFR profile. The energy density is estimated based upon both the classical energy spectrogram and the IFRS smoothened by the median filter. Moreover, the impact of an analyzing window width, additive white Gaussian noise and observation time is tested. Finally, the introduced method is used for the analysis of the acoustic emission of an automotive engine. The recording of the engine of a Lamborghini Gallardo is analyzed as an example.
The low coherence Fabry-Pérot interferometer with diamond and ZnO layers
- Daria Majchrowicz
- Wojciech Den
- Marzena Hirsch
2016
The authors present a fiber-optic Fabry-Pérot interferometer built with the application of diamond and zinc oxide (ZnO) thin layers. Thin ZnO films were deposited on the tip of a standard telecommunication single-mode optical fiber (SMF- 28) while the diamond layer was grown on the plate of silicon substrate. Investigated ZnO layers were fabricated by atomic layer deposition (ALD) and the diamond films were deposited using Microwave Plasma Enhanced Chemical Vapor Deposition (μPE CVD) system. Different thickness of layers was examined. The measurements were performed for the fiber-optic Fabry-Pérot interferometer working in the reflective mode. Spectra were registered for various thicknesses of ZnO layer and various length of the air cavity. As a light source, two superluminescent diodes (SLD) with central wavelength of 1300 nm and 1550 nm were used in measurement set-up
The low temperature waste heat recovery in drying process of pine wood using micro-jet heat exchanger
- Aleksandra Konopka
- Jacek Barański
2016 Annals of WULS, Forestry and Wood Technology
The article presents the influence of the drying medium temperature changes for the relative and absolute moisture content values during pine wood drying. The drying process was conducted at constant atmospheric pressure and with different drying medium (air) temperature levels, respectively: 40oC, 60oC, 80oC, 100oC, and 120oC. In order to develop a method that would enable low temperature drying of solid materials the experiments were performed in an innovative experimental rig equipped with micro-jet heat exchanger. It was noticed that the moisture content of drying solid material achieved at a temperature not exceeding 60oC gave satisfactory results. Low temperature drying method using micro-jet air can contribute to improve its efficiency, with appropriate selection of drying time.
The main developments of the CSR initiatives in Poland
- Magdalena Popowska
2016 Baltic RIM Economies
This short paper outlines the most important documents and initiatives that have appeared in the subject throughout the years within the international institutions, such as United Nations or European Union. It also discusses the ways in which the international CSR initiatives are being incorporated into Polish legislative and organizational system, by providing an outline of the biggest and most active organizations and foundations that are promoting responsible business within the country. Finally, it presents shortly the CSR promotion practices of Warsaw Stock Exchange, in particular the RESPECT Index.
The measurement of input power of power supply in network disturbed by low frequency distortions
- Stanisław Galla
- Arkadiusz Szewczyk
2016 Pełny tekst Przegląd Elektrotechniczny
In the paper authors present results of observation of input power changes versus harmonics amplitude in supply voltage of low-power power supply device. In the study, the electrical measurements supported with thermal imaging were used. The input circuit elements of studied device responsible for input power increase are pointed
The Method of a Two-Level Text-Meaning Similarity Approximation of the Customers’ Opinions
- Nina Rizun
- Paweł Kapłański
- Yurii Taranenko
2016 Pełny tekst Studia Ekonomiczne. Zeszyty Naukowe Uniwersytetu Ekonomicznego w Katowicach
The method of two-level text-meaning similarity approximation, consisting in the implementation of the classification of the stages of text opinions of customers and identifying their rank quality level was developed. Proposed and proved the significance of major hypotheses, put as the basis of the developed methodology, notably about the significance of suggestions about the existence of analogies between mathematical bases of the theory of Latent Semantic Analysis, based on the analysis of semantic relationship between the variables and degree of participation of the document or term in the corresponding concept of the document data, and instruments of the theory of Social Network Analysis, directed at revealing the features of objects on the basis of information about structure and strength of their interaction. The Contextual Cluster Structure, as well as Quantitative Ranking evaluation for interpreting the quality level of estimated customers’ opinion has formed.
The Method of Multi-criteria Analysis to Support the Decision on Load or Micro-generation Connection to a Low- or Medium-voltage Power Grid
- Paweł Bućko
- Jerzy Buriak
- Krzysztof Dobrzyński
- Marcin Jaskólski
- Piotr Skoczko
- Piotr Zieliński
2016 Pełny tekst Acta Energetica
This paper presents a method that supports the decision in terms on selecting the best option of a load connection to a low- or medium-voltage power distribution grid, and of a micro-generation source connection to a low-voltage grid. The method is based on the search for the option with the lowest aggregate assessment measure, which is the weighted average of partial assessment measures determined for each of eight considered criteria. For each of the first three, economic criteria, partial assessment measure was calculated using the normalisation method. For each of the other five, technical criteria, we developed a relative measure of the distance of the indicator from the threshold (e.g. the ratio of voltage drop in power supply line nodes in relation to its permissible value). This algorithm rejects variants whereby the thresholds set for partial criteria were exceeded in the time period of load/micro-generation source connection. The method was implemented in an MS Excel workbook and used to analyse complex problems of load or microgeneration source connections.
The methylome and transcriptome of fetal skin: implications for scarless healing
- Justyna Podolak-Popinigis
- Anna Ronowicz
- Monika Dmochowska
- Agnieszka Jakubiak
- Paweł Sachadyn
2016 Pełny tekst EPIGENOMICS-UK
Aim: Fetal skin is known to heal without scarring. In mice, the phenomenon is observed until the 16–17 day of gestation – the day of transition from scarless to normal healing. The study aims to identify key methylome and transcriptome changes following the transition. Materials & methods: Methylome and transcriptome profiles were analyzed in murine dorsal skin using microarray approach. Results & conclusion: The genes associated with inflammatory response and hyaluronate degradation showed increased DNA methylation before the transition, while those involved in embryonic morphogenesis, neuron differentiation and synapse functions did so after. A number of the methylome alterations were retained until adulthood and correlated with gene expression, while the functional associations imply that scarless healing depends on epigenetic regulation.
The New 3D Printed Left Atrial Appendage Closure with a Novel Holdfast Device: A Pre-Clinical Feasibility Animal Study
- Maciej Brzeziński
- Kamil Bury
- Leszek Dąbrowski
- Piotr Holak
- Aleksandra Sejda
- M. Pawlak
- Dariusz Jagielak
- Z. Adamiak
- Jan Rogowski
2016 Pełny tekst PLOS ONE
Many patients undergoing cardiac surgery have risk factors for both atrial fibrillation and stroke. The left atrial appendage (LAA) is the primary site for thrombi formation. Therefore LAA occlusion devices should be tested for their ability to reduce future cerebral ischemic events in patients with high-risk of haemorrhage. The aim of this study was to evaluate the safety and feasibility of a novel left atrial appendage exclusion device with a minimally invasive introducer in a swine model. A completely novel LAA device, which is composed of two tubes connected together using a specially created bail, was designed using finite element modelling to obtain an optimal support force of 36 N at the closure line. The monolithic form of the occluder was obtained by using additive manufacturing of granular PA2200 powder with the technology of selective laser sintering SLS. Fifteen swine were included in the feasibility tests. This novel 3D printed left atrial appendage closure technique with a novel holdfast device was proven to be safe and feasible in all pigs. A benign healing process without inflammation and damage to the surrounding structures or evidence of new thrombi formation was observed. Moreover, the uncomplicated survival and full LAA exclusion in all animals demonstrate the efficacy of this novel and relatively cheap device. Further clinical evaluation and implementation studies should be performed to introduce this new technology into clinical practice.
The origins of the brick architecture in Pomerania
- Piotr Samól
2016
Traditionally, brick is one of the most popular building materials on the southern coast of the Baltic Sea. Although the origins of brick architecture have been the subject of numerous research studies, their results were focused on the Kingdom of Denmark, merchant-towns and the State of the Teutonic Order. Most scholars claimed that Pomeranian architecture had not been as developed as that in the neighbouring countries. Moreover, most academics analysing the architecture of the Pomeranian duchies base their contentions on studies and field works that had been conducted before WWII. Therefore, contemporary literature does not include many results of architectural and archaeological research studies as regards the oldest brick complexes between Oder and Vistula rivers (e.g. Kolbacz/Kolbatz, Kamien/Cammin, Oliwa/Oliva, Gdansk/Danzig). Contrary to older studies, the last research studies allowed to establish that not only did brick architecture in that region refer to German patterns, but also to Cistercian and Dominican foundations from Poland and Denmark. The aim of the paper is to present the results of architectural researches (up to 2015) in the oldest monasteries in the northern Poland and to investigate the three main routes of transferring the brick-building technology to Pomerania
THE PANTOGRAPH AND ITS GEOMETRIC TRANSFORMATIONS - A FORMER POPULAR TOOL FOR COPYING AND SCALING
- Małgorzata Rogińska-Niesłuchowska
2016 Pełny tekst The Journal of Polish Society for Geometry and Engineering Graphics
Development of digital technology has resulted in significant transformations of designer workshops. Computer applications replaced the previously existing tools and methods for drawing up of projects. Professional, sophisticated drawing instruments and tools for manual plotting, as well as basic drawing aids, have gradually fallen into oblivion and become relicts of a bygone era - the objects of collectors' interest. Gdansk University of Technology prides itself on the possession of a great collection of old geometric tools, which serves not only to protect and promote the memory of past inventions that were used to support and improve the design processes, but also to inspire and develop creative imagination. The article describes the pantograph, considered to be the ancestor of today's photocopier, as it allows one to draw the copies and, at the same time, to enlarge or to reduce any figure. The author presents its genesis and the scope of application in the past. The construction of this tool and its geometrical transformations, which form the base of its action, are also explained.
THE PHASE SHIFTERS INFLUENCE ON THE POWER SYSTEM STABILITY
- Marcin Sarnicki
- Agata Szultka
- Bartosz Tarakan
- Krzysztof Tarakan
- Ryszard Zajczyk
2016
The paper presents the effect of phase shifters as FACTS devices on the possibility of improving the angle stability. Presented results obtained by the dynamic simulation performed on the mathematical model of the three machine system cooperating with the 400 kV network. The generative blocks models include turbine models with their controllers and models of synchronous generators with their excitation systems and voltage regulation. Modeled phase shifter included the voltage regulator and the active power regulator. Analysis of the impact of phase shifter on system stability was made for disturbance leading to the loss of global stability short circuit, local stability, voltage stability and changes in load.
The Positioning Accuracy of BAUV Using Fusion of Data from USBL System and Movement Parameters Measurements
- Naus Krzysztof
- Aleksander Nowak
2016 Pełny tekst SENSORS
The article presents a study of the accuracy of estimating the position coordinates of BAUV (Biomimetic Autonomous Underwater Vehicle) by the extended Kalman filter (EKF) method. The fusion of movement parameters measurements and position coordinates fixes was applied. The movement parameters measurements are carried out by on-board navigation devices, while the position coordinates fixes are done by the USBL (Ultra Short Base Line) system. The problem of underwater positioning and the conceptual design of the BAUV navigation system constructed at the Naval Academy (Polish Naval Academy—PNA) are presented in the first part of the paper. The second part consists of description of the evaluation results of positioning accuracy, the genesis of the problem of selecting method for underwater positioning, and the mathematical description of the method of estimating the position coordinates using the EKF method by the fusion of measurements with on-board navigation and measurements obtained with the USBL system. The main part contains a description of experimental research. It consists of a simulation program of navigational parameter measurements carried out during the BAUV passage along the test section. Next, the article covers the determination of position coordinates on the basis of simulated parameters, using EKF and DR methods and the USBL system, which are then subjected to a comparative analysis of accuracy. The final part contains systemic conclusions justifying the desirability of applying the proposed fusion method of navigation parameters for the BAUV positioning.
The potential of imogolite nanotubes as (co-)photocatalysts: a linear-scaling density functional theory study
- E Poli
- J Elliott
- L Ratcliff
- L Andrinopoulos
- Jacek Dziedzic
- Nicholas Hine
- Arash Mostofi
- C-K Skylaris
- Peter Haynes
- G Teobaldi
2016 Pełny tekst JOURNAL OF PHYSICS-CONDENSED MATTER
We report a linear-scaling density functional theory (DFT) study of the structure, wall-polarization absolute band-alignment and optical absorption of several, recently synthesized, open-ended imogolite (Imo) nanotubes (NTs), namely single-walled (SW) aluminosilicate (AlSi), SW aluminogermanate (AlGe), SW methylated aluminosilicate (AlSi-Me), and double-walled (DW) AlGe NTs. Simulations with three different semi-local and dispersion-corrected DFTfunctionals reveal that the NT wall-polarization can be increased by nearly a factor of four going from SW-AlSi-Me to DW-AlGe. Absolute vacuum alignment of the NT electronic bands and comparison with those of rutile and anatase TiO2 suggest that the NTs may exhibit marked propensity to both photo-reduction and hole-scavenging. Characterization of the NTs’ bandseparation and optical properties reveal the occurrence of (near-)UV inside–outside charge-transfer excitations, which may be effective for electron–hole separation and enhanced photocatalytic activity. Finally, the effects of the NTs’ wall-polarization on the absolute alignment of electron and hole acceptor states of interacting water (H2O) molecules are quantified and discussed.
The ranks of Indonesian and Japanese industrial sectors
- Ubaidillah Zuhdi
2016 Pełny tekst IOP Conference Series: Earth and Environmental Science
The purpose of this study is to determine the ranks of Indonesian and Japanese industrial sectors from the economic point of view. The analysis period of this study is 2005. This study employs one of the well-known analysis tools in the economic topic, the Input-Output (IO) analysis. More specifically, this study uses the analysis methods in the IO analysis, backward and forward linkages, in order to achieve the purpose. The results of calculations show that the orders of the ranks depend on the method used. Nevertheless, from the results, one can say that the manufacturing industry was a leading sector in the Indonesian economy on the analysis period. On the other hand, for the Japanese case, the sector which had the beneficial effects in the Japanese economy on the analysis period was the transport.
The ranks of Indonesian and Japanese industrial sectors
- Ubaidillah Zuhdi
2016
The purpose of this study is to determine the ranks of Indonesian and Japanese industrial sectors from the economic point of view. The analysis period of this study is 2005. This study employs one of the well-known analysis tools in the economic topic, the Input-Output (IO) analysis. More specifically, this study uses the analysis methods in the IO analysis, backward and forward linkages, in order to achieve the purpose. The results of calculations show that the orders of the ranks depend on the method used. Nevertheless, from the results, one can say that the manufacturing industry was a leading sector in the Indonesian economy on the analysis period. On the other hand, for the Japanese case, the sector which had the beneficial effects in the Japanese economy on the analysis period was the transport.
The reactivity of 1,1-dichloro-2,2-di-tert-butyldiphosphane towards lithiated metal carbonyls: a new entry to phosphanylphosphinidene dimers
- Rafał Grubba
- Mateusz Zauliczny
- Łukasz Ponikiewski
- Jerzy Pikies
2016 DALTON TRANSACTIONS
Reactions of [Cp*(OC)3M]Li (Cp* = C5Me5, M = Mo, W) towards t-Bu2P–PCl2 lead to the formation of phosphanylphosphinidene dimers [Cp*(OC)3M(η2-t-Bu2P–P)]2 in fairly good yields. The formation of a tetraphosphorus ligand proceeds via reductive dimerization of t-Bu2P–P units. NMR, X-ray investigations and DFT calculations show that the resulting tetraphosphorus ligand has a structure of dication t-Bu2P+=P–P=P+t-Bu2.