2013 - Repozytorium publikacji - Politechnika Gdańska

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Relacyjne i obiektowe bazy danych w zarządzaniu przedsiębiorstwem – przegląd i analiza porównawcza
- Łukasz Garbowski
- Robert Piotrowski
2013
Bazy danych są obecnie powszechnie wykorzystywanymi aplikacjami w życiu codziennym i zawodowym do gromadzenia, przetwarzania i zarządzania danymi. Stanowią one podstawowe narzędzie komputerowe wspomagające funkcjonowanie przedsiębiorstw bez względu na rodzaj prowadzonej działalności. Najpopularniejszymi rozwiązaniami oferowanymi przez firmy informatyczne są relacyjne i obiektowe bazy danych. W artykule dokonano przeglądu dostępnych na rynku baz danych i przeprowadzono ich analizę. Uwzględniono rozwiązania komercyjne i niekomercyjne.
Relationship between heart rate variability, blood pressure and arterial wall properties during air and oxygen breathing in healthy subjects
- Beata Graff
- Anna Szyndler
- Krzysztof Czechowicz
- Wiesława Kucharska
- Grzegorz Graff
- Pierre Boutouyrie
- Stephane Laurent
- Krzysztof Narkiewicz
- Krzysztof Narkiewicz
2013 AUTONOMIC NEUROSCIENCE-BASIC & CLINICAL
Previous studies reported that normobaric hyperoxia influences heart rate, arterial pressure, cardiac output and systemic vascular resistance, but the mechanisms underlying these changes are still not fully understood. Several factors are considered including degeneration of endothelium-derived nitric oxide by reactive oxygen species, the impact of oxygen-free radicals on tissues and alterations of autonomic nervous system function. Recently, new devices for the detailed non-invasive assessment of large and small arteries have been developed. Therefore, the aim of our study was to assess heart rate variability (HRV) as a potential indicator of autonomic balance and its relation to blood pressure and vascular properties during medical air (MAB) and 100% oxygen breathing (OXB) in healthy volunteers.
Relationship between semi- and fully-device-independent protocols
- Hong-Wei Li
- Piotr Andrzej Mironowicz
- Marcin Pawłowski
- Zhen-Qiang Yin
- Yu-Chun Wu
- Shuang Wang
- Wei Chen
- Hong-Gang Hu
- Guang-Can Guo
- Zheng-Fu Han
2013 Pełny tekst PHYSICAL REVIEW A
We study the relation between semi and fully device independent protocols. As a tool, we use the correspondence between Bell inequalities and dimension witnesses. We present a method for converting the former into the latter and vice versa. This relation provides us with interesting results for both scenarios. First, we find new random number generation protocols with higher bit rates for both the semi and fully device independent cases. As a byproduct, we obtain whole new classes of Bell inequalities and dimension witnesses. Then, we show how optimization methods used in studies on Bell inequalities can be adopted for dimension witnesses.
Reliability and Validity of Optoelectronic Method for Biophotonical Measurements
- Katarzyna Karpienko
- Maciej Wróbel
- Rafał Urniaż
2013
Reliability and validity of measurements is of utmost importance when assessing measuring capability of instruments developed for research. In order to perform an experiment which is legitimate, used instruments must be both reliable and valid. Reliability estimates the degree of precision of measurement, the extent to which a measurement is internally consistent. Validity is the usefulness of an instrument to perform accurate measurements of quantities it was designed to measure. Statistical analysis for reliability and validity control of low-coherence interferometry method for refractive index measurements of biological fluids is presented. The low-coherence interferometer is sensitive to optical path difference between interfering beams. This difference depends on the refractive index of measured material. To assess the validity and reliability of proposed method for blood measurements, the statistical analysis of the method was performed on several substances with known refractive indices. Analysis of low-coherence interferograms considered the mean distances between fringes. Performed statistical analysis for validity and reliability consisted of Grubb’s test for outliers, Shapiro-Wilk test for normal distribution, T-Student test, standard deviation, coefficient of determination and r-Pearson correlation. Overall the tests proved high statistical significance of measurement method with confidence level < 0.0001 of measurement method.
Remote Spatial Database Access in the Navigation System for the Blind
- Krzysztof Drypczewski
- Łukasz Kamiński
- Łukasz Markiewicz
- Bartosz Wiśniewski
- Andrzej Stepnowski
2013
The article presents the problem of a database access in the navigation systems. The authors were among the main creators of the prototype navigation system for the blind - “Voice Maps”. In the implemented prototype only exemplary, limited spatial data were used, therefore they could be stored in the mobile device’s memory without any difficulties. Currently the aforementioned system is being prepared for commercialization - the resulting increase of spatial data scale and complexity required a modification of the way the data are stored and accessed. Consequently, the decision was made to maintain a central spatial database. After that modification, the mobile application fetches necessary batch of spatial data remotely from the central server. The authors present the advantages and disadvantages of this new approach.
Removal of BTEX Compounds From Waste Gases; Destruction and Recovery Techniques
- Marta Słomińska
- Sylwia Król
- Jacek Namieśnik
2013 CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
The tendency for BTEX compounds (benzene, toluene, ethylbenzene, xylenes) to spread into all compartments of the environment together with their influence on both ecosystem and human health means that the emission of thesecompounds into the air is becoming the matter of worldwide concern. The legal regulations introduced by the European Union governing the assessment and management of air quality obliges member states to systematically reduce BTEX emissions into the atmosphere, and hence to monitor and then remove these compounds from contaminated gaseous media. Recent years have witnessed the ongoing search for new and improved techniques for removing BTEX compounds from waste gases. The authors describe the destruction techniques commonly used for treating waste gases, focusing on the ever more popular biological methods (with their modifications) and the well-established techniques utilizing oxidation. They focused on discussing both advantages and drawbacks of presented techniques. Attention is also drawn to innovative energy-conserving approaches (plasma methods) that are considered future trends in the contaminated air purification technology.
Removal of persistant organic pollutants from landfill leachates treated in three constructed wetland systems
- Ewa Wojciechowska
2013 WATER SCIENCE AND TECHNOLOGY
The objective of the study was assessment of occurrence and removal of two groups of persistent organic pollutants: polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) in landfill leachate (LL) treated in three constructed wetland systems (CWs) of different construction and flow regime. Two subsurface flow systems (SSF) were analyzed: one with horizontal flow and the second one consisting of two vertical flow beds followed by a horizontal flow bed. The third CW was a surface flow (SF) system, consisting of 10 ponds connected in series. The concentrations of 12 PAHs and 7 PCBs were measured in the samples of LL after subsequent treatment stages and in the sediment samples from the SF system as well as in the substrate samples from the SSF flow systems. It was confirmed that the major mechanism of PCB and PAH removal in CW systems was adsorption to the bottom sediments (in the SF system) or substrate of the beds (in the SSF systems) as well as adsorption to suspended solids, followed by sedimentation. The compounds characterized by higher octanol/water partition coefficient were more effectively retained in the sediments. Also removal of these substances occurred in the earlier stages of treatment.
RENOVATION OF ARCHIVE AUDIO RECORDINGS USING SPARSE AUTOREGRESSIVE MODELING AND BIDIRECTIONAL PROCESSING
- Maciej Niedźwiecki
- Marcin Ciołek
2013
The paper presents a new approach to elimination of broadband noise and impulsive disturbances from archive audio recordings. The proposed adaptive Kalman-like algorithm, based on a sparse autoregressive model of the audio signal, simultaneously detects noise pulses, interpolates the irrevocably distorted samples and performs signal smoothing. It is shown that bidirectional (forward-backward) processing of the archive signal improves smoothing efficiency and allows one to localize noise pulses more accurately, leading to noticeable performance improvements compared to unidirectional processing.
Renowacja systemu drenażowego w elektrowni wodnej Podgaje
- Witold Sterpejkowicz-Wersocki
- Wojciech Szudek
2013
Dysfunkcja systemów drenażowych jest najczęściej efektem kolmatacji, która powoduje "uszczelnienie" drenażu. W artykule przedstawiono problemy ze zjawiskiem cyklicznej kolmatacji drenaży w elektrowni wodnej Podgaje na rzece Gwdzie oraz przeprowadzoną w 2012 roku renowację systemu drenażowego.
Representation of magnetic hysteresis in tape wound core using feedback Preisach model
- Andrzej Wilk
2013 Pełny tekst Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
This paper presents a mathematical model for the hysteresis phenomenon in ferromagnetic tape wound core. The feedback scalar Preisach model of hysteresis is used to simulate magnetic behavior of the grain oriented silicon strip of ET114-27 type. Determination of B-H hysteretic curve is based on measurement of the initial magnetization curve and the main hysteresis loop. The Preisach distribution function (PDF) of ET114-27 material is approximated by functional series including two-dimensional Gauss expressions. Feedback function is represented by the third order polynomial. For identification of the PDF parameters the Levenberg-Marquardt optimization algorithm was used. The model has been validated by comparing measured and calculated results obtained from tests. Experiments and simulations confirm the accuracy of worked out hysteresis model.
Reprezentation of mechanic hysteresis in a railway track using the Preisach model
- Władysław Koc
- Andrzej Wilk
- Piotr Chrostowski
- Sławomir Grulkowski
2013 PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART F-JOURNAL OF RAIL AND RAPID TRANSIT
This paper presents an implementation of the classic scalar Preisach model to describe the hysteresis phenomenon created in a railway track subjected to lateral (in the horizontal plane) displacements. The principles of the Preisach theory and the scalar mathematical model of the mechanical hysteresis that is based on statistically distributed modified hysteresis operators are briefly presented. This article presents the characteristic states of the track displacements under lateral forces and their interpretation using the Preisach phase diagram. Formulas are presented that allow the calculation of the trajectory of the track displacements using the Preisach distribution function (PDF) and the Everett function (EF). Identification methods for the PDF and EF presented in the literature are discussed. A mathematical formula for the calculation of the EF on the basis of the major hysteresis loop is presented. The implemented hysteresis model is validated by comparing simulation results with experimental data. A good level of agreement between the two sets of results is observed which confirms the validity of the proposed model. The shape of the hysteresis loop created in the rail track depends on the stress state in the rails. It is suggested that this observation could be used to create an effective method to assess axial forces in continuous welded rail track.
Research by design w architekturze
- Antoni Taraszkiewicz
2013
W książce autor dowodzi, że w twórczym procesie powstawania dzieła architektonicznego, czyli obiektu zaprojektowanego a następnie zbudowanego, oprócz rozważań natury teoretycznej pierwszorzędną rolę odgrywają doświadczenia zdobyte na drodze praktycznego stosowania często na wpół intuicyjnych rozwiązań, mających dopiero w przyszłości stanowić podwalinę architektonicznych teorii. Obserwowana dzisiaj narastająca inwazja intuicji, emocji i nieprzewidywalności w procesie projektowym świadczy o tym najdobitniej. W dobie dzisiejszej, a więc w czasie braku ideologicznego oparcia i braku „pomysłu” na styl, architektura powinna w drodze praktycznych eksperymentów zdobywać fundament pod budowę swego współczesnego, teoretycznego kręgosłupa. Współczesna architektura nie jest przecież podporządkowana z góry narzuconym regułom, ale powstaje poprzez rodzaj współdziałania z wieloma, często bardzo skomplikowanymi i charakterystycznymi dla danego miejsca uwarunkowaniami. Tak kształtowane budynki są w większym stopniu odpowiedzią na kontekst miejsca, upodobania oraz wymagania inwestora i użytkownika czy program funkcjonalny, aniżeli zdeterminowanymi formalnie strukturami. Znamiennym jest przy tym fakt, że przy powstawaniu każdego ze współczesnych obiektów o ich ostatecznym kształcie decyduje inny zestaw czynników, spośród których czynniki mające decydujący wpływ na architekturę jednego dzieła w innym schodzą na plan dalszy lub wręcz znikają, ustępując pola nowym, nie branym wcześniej pod uwagę. Prowadzi to do ciekawej różnorodności nie tylko stylistycznej, ale i funkcjonalnej obiektów tworzonych nawet przez jednego autora. Praca składa się z ośmiu rozdziałów, w których przedstawiona jest szczegółowa analiza wybranych - bardzo różnorodnych i często oderwanych od siebie czynników, które zdaniem autora determinują współczesną twórczość architektoniczną. Należą do nich przede wszystkim: stosunek do najważniejszych nurtów współczesnej myśli architektonicznej - nowoczesność (modernizm) i ponowoczesność (neomodernizm, antymodernizm, postmodernizm), uwarunkowania lokalizacyjne w tym zwłaszcza kontekst historyczny, rola jaką budynek pełni w strukturze miasta, funkcja obiektu, zachodzące współcześnie zmiany w mentalności i sposobie życie ludzi oraz wymagania i preferencje użytkowników w stosunku do nowotworzonej architektury. Wyniki tych analiz wpływają na konkretne rozwiązania projektowo-realizacyjne, które w ujęciu „research by design” stanowią syntezę badań.
RESEARCH OF PARTIAL DISCHARGE IN THE LABORATORY CONSTRUCTE
- Stefan Hamacek
- Mikołaj Bartłomiejczyk
- Stanislav Misak
- Vitezlav Styskala
- Roman Hrabac
2013
Nowadays in the Czech Republic begins implementation of new types of leadership system with insulated conductors nowadays. This system is used because of the use of conductors in difficulties to reach terrains and lower failure rate. The finding of specific faults is problem, because today's digital protection are not able to find it.
Research on flue gas flow measurement and modelling in the moving grate biomass boiler
- Karol Ronewicz
- Tomasz Turzyński
- Izabela Wardach-Święcicka
- Dariusz Kardaś
2013
The aim of this research was to determine the nature of gas flow in a grate boiler model by the method of Particle Image Velocimetry (PIV) and CFD. The paper presents the comparison of the PIV results with numerical simulations made in the environment of ANSYS Fluent. The main goal of the experiment was to describe the phenomena occurring on the grate. Methodology of modelling solid fuel combustion on the moving grate was proposed and presented in this paper.
Research on the separation properties of empty-column gas chromatography (EC-GC) and conditions for simulated distillation (SIMDIS)
- Grzegorz Boczkaj
- Marian Antoni Kamiński
2013 Pełny tekst ANALYTICAL AND BIOANALYTICAL CHEMISTRY
The paper presents the results of investigations on new procedures of determination of selected cleaning additives in diesel fuel. Two procedures: one-step analysis using gas chromatography with flame ionization detection (GC-FID) or mass spectrometry (GC-MS) and a two-step procedure in which normal-phase high-performance liquid chromatography (NP-HPLC) was used for preliminary separation of the additives, were compared. The additive fraction was collected using either simple elution or eluent backflush. Final determinations were performed by GC-FID and GC-MS. The studies revealed that it was impossible to determine the investigated analytes by one-step procedures, i.e. by using solely HPLC or GC. On the other hand, the use of a two-step procedure ensures reproducible results of determinations, and the limits of quantitation are, depending on the method of fraction collection by HPLC, from 1.4-2.2 ppm (GC-MS in SIM mode) to 9.6-24.0 ppm (GC-FID). Precision and accuracy of the developed procedures are compared, and possible determination errors and shortcomings discussed.
Research on Tool Temperature Dependence on Lapping Grains Size
- Justyna Molenda
- Adam Charchalis
- Adam Barylski
2013 Solid State Phenomena
Commonly used as a finishing operation, lapping has been used for achieving ultra-high finishes and close tolerances between mating pieces. Its carried out by applying loose abrasive grains between work and lap surfaces, and causing a relative motion between them resulting in a finish of multi-directional lay. The grains activity (sliding and rolling) in the working gap causes not only the material removal but also the temperature rise of lap plate. This work presents the results of lapping plate temperature rise research. The investigation has been conducted to check the influence of grains size on. It was made during flat lapping with use of ABRALAP 380 lapping machine and infrared camera Thermo Gear G100. The lapping machine executory system consisted of three working conditioning rings. Plate temperature was measured during ceramic (Al2O3) elements lapping. The elements were valve sealing parts. After grinding they were processing with three abrasive grains sizes: F400/17, F800/6.5 and F1200/3. The abrasive mixture was boron carbide powder mixed with kerosene and machine oil with grain concentration 0.25. Other lapping parameters remained constant during process. The wheel speed was 60 rev/min and lapping pressure 0.04 MPa. In the next step the statistical analysis was conducted. It was analysed if the plate temperature is influenced by the grains size. A hypotheses testing method was use. Results were calculated for temperature rise values measured after 300 minutes of machine working. According to them the influence of abrasive grains size on plate temperature rise is statistically insignificant, what is not consisted with the model.
Research Platform for Monitoring, Control and Security of Critical Infrastructure Systems
- Grzegorz Ewald
- Tomasz Zubowicz
- Mieczysław Brdyś
2013
Sustainable operation of Critical Infrastructure Systems (CISs) is of a major concern to modern societies. Monitoring, control and security of such systems plays a key role in guaranteeing continuous, reliable and above all secure access to the resources provided by these systems. Development of adequate software and hardware structures, as well as algorithms to perform such functions cannot be done apart from the operational conditions of the plant. On the other hand the dependencies between the resources provided by the CIS and the societies, prevents from experiments. Also this approach could be found costly and hard to justify in the world driven by hard economics. This, once again calls for the simulation tools to be exploited. Due to the vast complexity of these systems including spatial distribution over a wide area, a control engineering based multiagent framework is often utilised to cope with the issues of monitoring, control and security of CIS. Since there is no of the shelve solution for the development of such systems a novel, interesting, approach is proposed within this work to cope with the CIS simulation environment. The environment is based on the JADE and Matlab. A simple, but computational demanding example is provided, presenting the abilities and performance of the Research Platform. The simulation example is presented in the context of the new complex water quality model.
Research, theories and practical experience of therapeutic landscapes as a tool for urban open space design
- Monika Trojanowska
2013
This paper reviews the research on therapeutic landscapes and discusses the design of urban parks and open green space. Firstly, the most relevant research on therapeutic landscapes is reviewed. Secondly, the practical experience of healing and therapeutic gardens is discussed. Finally, the conclusions leading to future use of therapeutic landscape concept in urban open space design are presented.
RESIDUE ANALYSIS OF ETU AND PTU BY LC/MS
- Jolanta Stocka
- Marek Biziuk
2013
Dithiocarbamates (DTCs) are important organosulfur compounds, which act as inhibitors of metal dependant and sulphydryl enzymes and have a serious consequence on biological systems. They possess variety of applications in agriculture as fungicides, as well as, in the rubber industry as vulcanization accelerators and antioxidants. In this way, DTCs are the main group of fungicides used to control approximately 400 pathogens of more than 70 crops and are registered in all the EU member states and many other countries. Ethylenthiourea (ETU) and propylenthiourea (PTU) are the most important transformation products of DTCs suspected to cause various pathogenic effects. A rapid and very sensitive method for trace analyses of transformation products of DTCs by liquid chromatography was successfully introduced. Good recoveries for different matrices and low limits of detection and quantification were achieved.
Resistance of Escherichia coli and Enterococcus spp. to selected antimicrobial agents present in municipal
- Aneta Łuczkiewicz
- Ewa Felis
- Aleksandra Ziembińska
- Anna Gnida
- Ewa Kotlarska
- Krystyna Olańczuk-Neyman
- Joanna Surmacz-Górska
2013 JOURNAL OF WATER AND HEALTH
In this study, the susceptibility to erythromycin (E) and to trimethoprim/sulfamethoxazole (SXT) among isolates of Enterococcus spp. and Escherichia coli was tested, respectively. Both fecal indicators were detected and isolated from raw(RW) and treated wastewater (TW) as well as from samples of activated sludge (AS) collected in a local wastewater treatment plant (WWTP). Biodiversity of bacterial community in AS was also monitored using polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE). Additionally, distribution of sul1–3 genes conferring sulfonamide resistance was tested among SXT-resistant E. coli. Simultaneously, basic physicochemical parameters and concentrations of eight antimicrobial compounds (belonging to folate pathway inhibitors and macrolides class) were analyzed in RW and TW samples. Six of the selected antimicrobial agents, namely: erythromycin, clarithromycin, trimethoprim, roxithromycin, sulfamethoxazole, and N-acetylsulfamethoxazole were detected in the wastewater samples. Bacterial biodiversity of AS samples were comparable with no relevant differences. Among tested Enterococcus spp., E-resistant isolates constituted 41%. SXT resistance was less prevalent in E. coli with 11% of isolates. The genes conferring resistance to sulfonamides (sul1–3) were detected in SXT-resistant E. coli of wastewater