2016 - Publications Repository - Gdańsk University of Technology

Show publications from the year

Publications from the year 2016

Show all

Cold-Active beta-Galactosidases: Sources, Biochemical Properties and Their Biotechnological Potential
- Hubert Cieśliński
- Marta Wanarska
- Anna Pawlak-Szukalska
- Ewelina Krajewska
- Monika Wicka-Grochocka
- Józef Kur
2016
beta-D-Galactosidases have been studied extensively in terms of their application to a variety of industrial technologies. To date, considerable research efforts have been devoted to characterization of new cold-active beta-D-galactosidases which were isolated directly from selected species of bacteria and yeasts, as well as with the use of metagenomic approaches. This chapter will provide a review of current research towards cold-active beta-D-galactosidases, focusing on the evaluation of the biochemical properties of this group of enzymes and their biotechnological potential in terms of their application to the enzymatic hydrolysis of lactose in milk and milk-based foodstuffs for people with lactose intolerance; the enzymatic synthesis of galactooligosaccharides and heterooligosaccharides (e.g., lactulose); the enzymatic synthesis of alkyl glycosides and nonionic surfactants, which can be used in chemical and pharmaceutical industries; and the enzymatic synthesis of functional food ingredients such as D-tagatose, which is a low-calorie, tooth-friendly sweetener that can be used in confectionery, beverages and dietary products.
Collaborative Editing of Ontologies Using Fluent Editor and Ontorion
- Seganti Alessandro
- Paweł Kapłański
- Paweł Zarzycki
2016
In this paper we present two tools that we are developing at Cognitum for managing large knowledge bases: Fluent Editor and the Ontorion Server. We have been able to build a collaborative knowledge management system using these two tools. We show how this system can be used for the concurrent modification of knowledge and how we can manage multiple modifications to the same knowledge.
Combined Single Neuron Unit Activity and Local Field Potential Oscillations in a Human Visual Recognition Memory Task
- Michał Tomasz Kucewicz
- Brent M. Berry
- Mark R. Bower
- Jan Cymbalnik
- Vojtech Svehlik
- S. Matthew Stead
- Gregory A. Worrell
2016 IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
GOAL: Activities of neuronal networks range from action potential firing of individual neurons, coordinated oscillations of local neuronal assemblies, and distributed neural populations. Here, we describe recordings using hybrid electrodes, containing both micro- and clinical macroelectrodes, to simultaneously sample both large-scale network oscillations and single neuron spiking activity in the medial temporal lobe structures of human subjects during a visual recognition memory task. We quantify and compare single neuron unit activity (SUA) with high-frequency macrofield oscillations (HFOs) for decoding visual images. RESULTS: SUA and HFOs were recorded using hybrid electrodes containing both micro and macroelectrode contacts, implanted in patients with focal epilepsy. Decoding of image properties in different task trials was performed, analyzing SUA and HFO as point processes to capture the dynamics of neurons and their assemblies at different spatiotemporal scales, ranging from submillisecond discharges of single units to fast oscillations across large neuronal populations. Results highlight the limitations and potential complementary use of SUA and HFOs for decoding of general image properties. CONCLUSION: The dynamics of SUA and HFOs can be used to explore a wide range of neuronal assembly activities engaged in human memory processing. SIGNIFICANCE: Hybrid electrodes provide a technological bridge for exploring multiscale activity, spanning individual neurons, their assemblies, and large-scale population activity reflected in local field potentials. Analysis of SUA and HFO dynamics as point processes provides a potentially useful signal processing method for exploring the neuronal correlates operating at different spatial scales.
COMBINING FUNCTIONAL AND AESTHETIC ASPECTS OF DAYLIGHTING IN SUSTAINABLE ARCHITECTURE WITH THE USE OF DIGITAL DESIGN METHODS
- Małgorzata Rogińska-Niesłuchowska
2016
The aesthetics of modern architecture should relate to its origins and goals - the environment, function, sustainability and its users. One of the conditions that meet the criteria is the presence of daylight and the use of its potential. The contemporary digital tools that support the design process allow to controlling the use of difficult and capricious materials, such as daylight. They also combine daylighting aspects with other criteria of sustainability, such as the natural ventilation of the building or the use of renewable energy. The purpose of the study is to show the influence of contemporary ideas on the aesthetic image of modern architecture on the basis of the chosen museum building. The adopted research methodology is the case study and the method of analysis and criticism of literature. The study comes to the conclusion that the image of modern architecture results from the connection of contemporary aesthetic and functional needs with tradition by means of highly advanced technology. The work is a part of the broader studies concerned with distinctive features and trends in the architecture that uses natural light in the era of sustainability and computer technology.
Compact City na Żernikach = Compact City in Żerniki
- Izabela Mironowicz
2016
The paper explores the impact of the new neighbourhood built within the framework of the European Capital of Culture 2016 in Wrocław on the future development of the city.
COMPARATIVE ANALYSIS OF RESULTS OF APPLICATION OF MARKOV AND SEMI-MARKOV PROCESSES TO RELIABILITY MODELS OF MULTI-STATE TECHNICAL OBJECTS
- Jacek Rudnicki
2016 Full text Journal of Polish CIMEEAC
During rational operation of technical objects and systems various operational decisions are made and decision-making process itself should be consisted in selecting that considered most favourable out of all possible to be taken. Choice of such decision is possible after taking into account many different information items but it never be completely correct without accounting for data and indices dealing with reliability. In the case when probabilistic principle of failure occurrence is determined , values of reliability indices can be estimated by using reliability mathematical models. During operation of many technical devices and systems ( e.g. ship main propulsion systems ) was observed many times the fact that their correct operation time is not a unique measure of their wear. Therefore for description of their serviceability and reliability can be used models of change of their reliability states in the form of semi-Markov processes based on the assumption of multi-state character of technical objects. This paper presents a comparative analysis of results of simulation reliability tests of a hypothetical technical object , obtained with the use of reliability models in the form of Markov processes and semi-Markov ones, corresponding to them, called also “half-Markov” processes.
COMPARATIVE ANALYSIS OF TRANSPORT ORGANIZATION AND FUNCTIONING OF WATER TRAMS IN GDAŃSK, BYDGOSZCZ AND KRAKÓW
- Emilia Miszewska
- Magdalena Apollo
2016 Full text Advances in Science and Technology Research Journal
The subject of this work is to identify and juxtapose solutions implemented in transport provided by water trams for the following cities: Gdańsk, Bydgoszcz and Kraków. As a result of the conducted analysis of transport factors, the degree of conformity of project objectives to the actual role of the water tram has been determined. It was found that the Kraków Water Tram (also known as Cracow Water Tram) is characterized by the greatest degree of conformity with project objectives. The solutions adopted in the project can be used to develop organizational and functional standards for this type of transport in Poland, since the lack of system solutions and little experience in implementation of water trams resulted in different organizational and technical approaches in their functioning.
Comparative molecular dynamics study of dimeric and monomeric forms of HIV-1 protease in ligand bound and unbound state
- Monikaben Padariya
- Umesh Kalathiya
2016 GENERAL PHYSIOLOGY AND BIOPHYSICS
Human immunodeficiency virus type 1 protease (HIV-1 PR) is a viral-encoded enzyme that forms a homodimer. HIV-1 PR is essential for replication and assembly of the virus and inactivation of HIV-1 PR enzyme causes production of immature, noninfectious viral particles and thus HIV-1 PR is an attractive target in anti-AIDS drug design. In our current work, we performed molecular dynamics (MD) calculations (500 ns) for two different ligands (COM5 (designed in our previous study) and Darunavir) and made effort to understand dynamics behaviour of our designed compound COM5 and compared with FDA approved HIV-1 protease inhibitor Darunavir in complex with dimer and monomer form of HIV-1 PR. An apo form of HIV-1 protease as monomer and dimer form was also studied for 1000 ns of MD time in order to study response of protein to the ligand. MD results suggests that presence of ligand in dimer systems hinders the stability of HIV-1 protease enzyme and one monomer from dimer systems is dominant on other monomer in terms of interaction made with ligands. Monomer form of HIV-1 is more stable in ligand bound state as that of ligand unbound. We were able to trace functional residues as well as continuous motion of opening and closing (clapping) of flap region in HIV-1 PR (apo form) during entire 1000 ns of MD simulation. COM5 showed almost similar behaviour towards HIV-1 protease enzyme as Darunavir and propose as promising lead compound for the development of new inhibitor for HIV-1 protease.
Comparison between measured and calculated underwater pressure of merchant ship
- Jan Bielański
- Karol Listewnik
2016 Full text HYDROACOUSTICS
From 2012 The Polish Naval Academy take part in an international research project SIRAMIS, carried out in the framework of the European Defence Agency. The objective of this project is to improve the understanding of ship signature interaction with multi influence sensors in relevant and realistic scenario's. This paper describes selected results of the comparison results of sea trials and model calculations of the hydrodynamic field distribution around a moving ship in selected waters of The Gulf of Gdansk. Despite the good results of the comparison of calculations and measurements of pressure signature for the example of a passenger ship, some measurements deviate significantly from the theoretical results. Due to the lack of reproducibility of these deviations may be due to errors in reading the real positions of underwater measurement modules. This comparison allows for increasing the reliability of theoretical calculations by the results of measurements, and it is expected that the development of this method allows for determining the parameters of the pressure under the hull at any point situated at a distance of not more than 1 meter from the seabed.
Comparison of Acoustic and Visual Voice Activity Detection for Noisy Speech Recognition
- Piotr Bratoszewski
- Grzegorz Szwoch
- Andrzej Czyżewski
2016
The problem of accurate differentiating between the speaker utterance and the noise parts in a speech signal is considered. The influence of utilizing a voice activity detection in speech signals on the accuracy of the automatic speech recognition (ASR) system is presented. The examined methods of voice activity detection are based on acoustic and visual modalities. The problem of detecting the voice activity in clean and noisy speech is considered. The speech signal was recorded in a real-life scenario in an office-like environment with the babble noise generated by the loudspeakers at different levels. The proposed method of visual voice activity detection is aimed at enhancing the accuracy of ASR when the ratio of signal to noise is low. The numerals in English language are used as speech material and Word Error Rate (WER) is employed for the evaluation purposes.
Comparison of continuous and discontinuous constitutive models to simulate concrete behaviour under mixed mode failure conditions
- Jerzy Bobiński
- Andrzej Tejchman-Konarzewski
2016 INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
W artykule porównano modele MES ciągłe i nieciągłe do symulacji zachowania betonu w warunkach mieszanego zniszczenia. W ramach modeli ciągłych zastosowano modele sprężysto-plastyczne oraz modele z redukcją sztywności sprężystej i nielokalnym osłabieniem. W ramach modeli nieciągłych zastosowano XFEM. Przedmiotem obliczeń były strefy lokalizacji i rysy w warunkach mieszanego zniszczenia wg testu doświadczalnego Nooru-Mohameda.
Comparison of direct and inverse methods of satellite observations downscaling for the coastal zone area
- Andrzej Chybicki
- Zbigniew Łubniewski
2016 Full text HYDROACOUSTICS
The Earth observation satellite imaging systems have known limitations, especially regarding their spatial and temporal resolution. Therefore, approaches which aim to combine data retrieved from sensors of higher temporal and lower spatial resolution with the data characterized by lower temporal but higher spatial resolution are of high interest. This allows for joint utilization of the advantages of both these types of sensors. As there are several ways to achieve this goal, in this paper two approaches, direct and inverse, of downscaling the land surface temperature (LST) derived from low resolution imagery acquired by the Advanced Very High Resolution Radiometer (AVHRR) were evaluated. The applied downscaling methods utilize biophysical properties of the surface sensed using short wave infrared and thermal band. The presented algorithm evaluation was performed on the basis of a specific test case: the coastal zone area of the Gulf of Gdańsk, Poland. In this context, the objective presented in the study was to compare two methods of downscaling for a specific test case in order to evaluate how the proposed approaches cope with the specific conditions of the coastal zone area.
Comparison of Evaluation of Air Odour Quality in Vicinity of Petroleum Plant Using a Prototype of Electronic Nose Instrument and Fast GC Technique
- Tomasz Dymerski
- Jacek Gębicki
- Jacek Namieśnik
2016 CHEMICAL ENGINEERING TRANSACTIONS
The paper presents the results of investigation on classification of the ambient air samples collected in a vicinity of the LOTOS Group S.A. petroleum plant with respect to odour. The investigations were carried out with an electronic nose prototype and a commercial electronic nose of Fast GC-type – HERACLES II. The prototype was equipped with a set of six semiconductor sensors by FIGARO Co. and a photoionization sensor of PID-type. Classification of the air samples depending on the sampling point with respect to the petroleum plant was performed with linear discriminant function supported with cross-validation method. Analyses with the HERACLES II yielded over 94.2% of correct classifications of the ambient air samples. In case of the electronic nose prototype correct classification was at the level of 67.5%.
Comparison of GPS tropospheric delays derived from two consecutive EPN reprocessing campaigns from the point of view of climate monitoring
- Zofia Baldysz
- Grzegorz Nykiel
- Andrzej Araszkiewicz
- Mariusz Figurski
- Karolina Szafranek
2016 Full text Atmospheric Measurement Techniques
The main purpose of this research was to acquire information about consistency of ZTD (zenith total delay) linear trends and seasonal components between two consecutive GPS reprocessing campaigns. The analysis concerned two sets of the ZTD time series which were estimated during EUREF (Reference Frame Sub-Commission for Europe) EPN (Permanent Network) reprocessing campaigns according to 2008 and 2015 MUT AC (Military University of Technology Analysis Centre) scenarios. Firstly, Lomb–Scargle periodograms were generated for 57 EPN stations to obtain a characterisation of oscillations occurring in the ZTD time series. Then, the values of seasonal components and linear trends were estimated using the LSE (least squares estimation) approach. The Mann–Kendall trend test was also carried out to verify the presence of linear long-term ZTD changes. Finally, differences in seasonal signals and linear trends between these two data sets were investigated. All these analyses were conducted for the ZTD time series of two lengths: a shortened 16-year series and a full 18-year one. In the case of spectral analysis, amplitudes of the annual and semi-annual periods were almost exactly the same for both reprocessing campaigns. Exceptions were found for only a few stations and they did not exceed 1 mm. The estimated trends were also similar. However, for the reprocessing performed in 2008, the trends values were usually higher. In general, shortening of the analysed time period by 2 years resulted in a decrease of the linear trends values of about 0.07mm yr-1. This was confirmed by analyses based on two data sets.
Comparison of heat transfer characteristics in surface cooling with boiling microjets of water, ethanol and HFE7100
- Tomasz Muszyński
- Dariusz Mikielewicz
2016 APPLIED THERMAL ENGINEERING
The basis of microjet technology is to produce jets which impinge the surface at the stagnation point with a very high kinetic energy. Main objective of this paper was to investigate the physical phenomena occurring on solid surfaces upon impingement of the single microjet in case of three fluids, namely water, ethanol and HFE7100. Intense heat transfer in the impact zone of microjet has been examined and described with precise measurements of thermal and flow conditions of microjets. Applied technology of jet production can result with the size of jets ranging from 20 to 500 μm in breadth and 20 to 100 μm in width. Reported tests were conducted under steady state conditions for surface cooling by single microjet producing an evaporating film. Obtained data have been used to validate authors own semi-empirical model of surface cooling by evaporating microjet in the stagnation point. Obtained database of experimental data with analytical correlations allows the rational design of microjet modules for various industrial applications.
Comparison of hydrogen bonds and diverse weak interactions of the nitro group in 2-methyl-4-nitroanilinium nitrate, bisulfate and two hexafluoridosilicates: elementary graph-set approach
- Marek Daszkiewicz
- Agnieszka Mielcarek
2016 Acta Crystallographica Section B-Structural Science Crystal Engineering and Materials
Crystal structures of (H2m4na)NO3 (1), (H2m4na)HSO4 (2), (H2m4na)2SiF6 (3) and (H2m4na)2SiF6*2H2O (4), where 2m4na = 2-methyl-4-nitroaniline, are presented. Two layers of interactions occur in the structures, N—H...O/F hydrogen bonds and interactions with the nitro group. Although diverse, hydrogen-bonding patterns are compared with each other by means of interrelations among elementary graph-set descriptors and descriptors of hydrogen-bonding patterns. Using mathematical relations, the gradual expansion of the ring patterns was shown in the crystal structures.
Comparison of hydrophilic interaction and reversed phase liquid chromatography coupled with tandem mass spectrometry for the determination of eight artificial sweeteners and common steviol glycosides in popular beverages
- Paweł Kubica
- Jacek Namieśnik
- Andrzej Wasik
2016 Full text JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
Hydrophilic interaction liquid chromatography (HILIC) coupled with tandem mass spectrometry (MS/MS) was used to separate artificial and natural sweeteners approved for use in European Union (EU). Among three tested HILIC columns (BlueOrchid PAL-HILIC, Ascentis Express Si and Acclaim™ Trinity™ P2) the last one was selected for the development of HILIC method due to the best results obtained with it. Early eluting and coeluting compounds in HILIC (acesulfame-K, saccharin, cyclamate, sucralose and aspartame) were successfully separated by the HILIC-based approach for the first time. The developed HILIC method allows for determination of all high potency sweeteners in one analytical run. The calibration curves for all analytes had good linearity within the tested ranges. The limits of detection and quantitation were in the range 0.81–3.30 ng/mL and 2.32–9.89 ng/mL, respectively. The obtained recoveries used for trueness and precision estimation were from 98.6% to 106.2% with standard deviation less than 4.1%. Sample preparation was reduced to a necessary minimum and contained only proper dilution and centrifugation. More than twenty samples of beverages were analyzed with the developed HILIC method. Finally, the chromatographic parameters of peaks (reduced retention time, width at baseline, width at 50% of peak height, tailing factor and efficiency) obtained in HILIC mode and in RPLC mode were compared. Developed HILIC method along with RPLC method can be applied for rapid evaluation of sweeteners' content, quality and safety control.
Comparison of Impedance-Source Networks for Two and Multilevel Buck–Boost Inverter Applications
- Oleksandr Husev
- Frede Blaabjerg
- Carlos Roncero-Clemente
- Enrique Romero-Cadaval
- Dmitri Vinnikov
- Yam Siwakoti
- Ryszard Strzelecki
2016 IEEE TRANSACTIONS ON POWER ELECTRONICS
mpedance-source networks are an increasingly popular solution in power converter applications, especially in single-stage buck-boost power conversion to avoid additional front-end dc-dc power converters. In the survey papers published, no analytical comparisons of different topologies have been described, which makes it difficult to choose the best option. Thus, the aim of this paper is to present a comprehensive analytical comparison of the impedance-source-based buck-boost inverters in terms of passive component count and semiconductor stress. Based on the waveform of the input current, i.e., with or without a transformer, and with or without inductor coupling, the impedance-source converters are classified. The main criterion in our comprehensive comparison is the energy stored in the passive elements, which is considered both under constant and predefined high frequency current ripple in the inductors and the voltage ripple across the capacitors. Two-level and multilevel solutions are described. The conclusions provide a “one-stop” information source and a selection guide of impedance-source-based buck-boost inverters for different applications.
Comparison of natural frequencies of a circular saw blade obtained empirically and with FEM
- Anna Danuta Kaczmarek-Peniakova
- Kazimierz Orłowski
- Lubomir Javorek
2016 Annals of WULS, Forestry and Wood Technology
The knowledge of the natural frequencies’ values of circular saw blades is necessary to determine the minimal critical rotational speed in which they can work with required stability. Moreover, testing the circular saw blades with more complicated shapes, e.g. which have additional holes inside blades for cleaning knifes or additional indirect teeth in gullets, reveals some kind of problematic properties of these saw blades. The aim of this paper is to compare results from two kinds of methods, which have been used for determining of the resonant frequencies of the circular saw blades. The harmonic test and the FEM were applied.
Comparison of oil yield and quality obtained by different extraction procedures from salmon (Salmo salar) processing byproducts
- Agnieszka Głowacz-Różyńska
- Maria Tynek
- Edyta Malinowska-Pańczyk
- Dorota Martysiak-Żurowska
- Roman Pawłowicz
- Ilona Kołodziejska
2016 Full text EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
The content and composition of lipids in different byproducts (skins, heads, and backbones) from mechanically processed farmed Atlantic salmon were determined and compared with that obtained from wild salmon. Three different procedures were used to establish the optimal conditions of oil extraction (at high temperature −95°C, “cold” extraction at temperature not exceeding 15°C and enzyme assisted with Alcalase). “Cold” extraction at temperature not exceeding 15°C was very efficient, yielding almost 95% of the oil from skins. In the case of heads the obtained yield of about 71% was not lower than that from extraction performed at 95 °C or extraction supported by enzyme treatment. The peroxide value of oil isolated from the heads using “cold” extraction was at the same level as in oil of the enzyme assisted process, but four times lower than in oil extracted at high temperature. The results showed that the content of lipids from in the farmed salmon byproducts the content of lipids was about 45–55% higher than in byproducts of wild salmon, however the EPA + DHA content was 10–33% lower.