2015 - Repozytorium publikacji - Politechnika Gdańska

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The nonlinear effects of sound in a liquid with relaxation losses
- Anna Perelomova
2015 Pełny tekst CANADIAN JOURNAL OF PHYSICS
The nonlinear effects of sound in electrolyte with a chemical reaction are examined. The dynamic equations that govern non-wave modes in the field of intense sound are derived, and acoustic forces of vortex, entropy, and relaxation modes are determined in the cases of low-frequency sound and high-frequency sound. The difference in the nonlinear effects of sound in electrolyte and in a gas with excited vibrational degrees of molecules, are specified and discussed.
The occurence and diagnosis of biomarkers of ethyl alcohol consumption
- Mateusz Kacper Woźniak
- Marek Wiergowski
- Marek Biziuk
2015 UWM Law Review
Ethyl alcohol is a legal and a widely available psychoactive drug. However, its excessive consumption causes addiction. This leads to aggressive behaviors, family battery, difficulties in interpersonal relations, legal offences, suicides, car accidents and deterioration in labor productivity, what causes financial problems. Despite many social actions against alcohol consumption, this problem is still unresolved. Therefore, fast and easy diagnosis of alcohol consumption is required to introduce proper and effective therapy and control sobriety during treatment. The determination of ethanol in human breath or in body fluids, due to fast metabolism rate of this substance, allows to monitor only recent drinking. Therefore, biomarkers of alcohol consumption are becoming more and more popular to confirm alcohol consumption in a wider range of time. This paper describes in details direct alcohol biomarkers, due to the possibilities of their determination by chromatographic techniques, what is an interesting area of study for an analytical chemist.
The paired-domination and the upper paired-domination numbers of graphs
- Włodzimierz Ulatowski
2015 Pełny tekst Opuscula Mathematica
In this paper we obtain the upper bound for the upper paired-domination number and we determine the extremal graphs achieving this bound. Moreover we determine the upper paired- domination number for cycles.
The possibilities for application of new comminution circuits in order to improve technological indexes of KGHM Polska Miedź S.A. copper ore concentrators = Możliwości zastosowania nowych układów rozdrabniania w aspekcie wskaźników technologicznych w warunkach O/ZWR
- Andrzej Konieczny
- Witold Pawlos
- Małgorzata Krzemińska
- Katarzyna Księżniak
2015
Artykuł opisuje zagadnienia związane z efektywnością procesu przygotowania urobku do wzbogacania. Przeanalizowano w nim aktualne układy rozdrabniające, oparte o kruszarki młotkowe i młyny prętowe, jak również warianty układów rozdrabniania z aplikacjami najnowszych rozwiązań techniczno – technologicznych tj. wysokociśnieniowej kruszarki walcowej oraz kruszarki stożkowej. Omawiane aspekty oparte są na badaniach prowadzonych w warunkach O/ZWR, doświadczeniu kadry oraz dostosowane do warunków kubaturowych istniejących zakładów. Aktualnie, ze względu na małą skuteczność obecnego procesu przygotowania urobku do flotacji oraz jego wysoką energochłonność działania w kierunku poprawy efektywności tego układu są priorytetowe, a jedną z możliwych dróg rozwoju w tym kierunku jest określenie możliwości zastosowania nowatorskich rozwiązań, co jest przedmiotem działalności badawczo-rozwojowej oraz testowej prowadzonej w Oddziale.
THE POSSIBILITY OF USE OF LASER-MODIFIED Ti6Al4V ALLOY IN FRICTION PAIRS IN ENDOPROSTHESES
- Beata Majkowska-Marzec
- Magdalena Jażdżewska
- Emilia Wołowiec
- Witold Piekoszewski
- Leszek Klimek
- Andrzej Zieliński
2015 Pełny tekst ARCHIVES OF METALLURGY AND MATERIALS
The purpose of this paper is to show results of laser treatment at cryogenic conditions of the Ti6Al4V alloy used for orthopedic applications. That modification process ought to bring beneficial changes of microstructure and residual stresses in the surface layer. The paper presents the abrasive wear of the base and laser remelted material in association with ceramics Al2O3. Despite the surface cracking after laser treatment the tribological properties in simulated body fluid have been substantially improved.
THE PROBLEM OF THE BANKING SYSTEM STABILITY IN THE LITERATURE
- Katarzyna Kubiszewska
2015 Pełny tekst INTERCATHEDRA
The article is an overview of the literature output in the field of banking sector stability. In the literature a plethora of definitions of the term may be encountered. There is no universal definition of the term. Therefore, the article proposes a unique division of the existing explanations into the following groups: stability determined by the quality of the banking sector, stability in terms of its influence on the macroeconomic situation and stability understood as the absence of a crisis. It will be shown that in the literature there does not exist a universal definition which would explain stability of the banking system. Due to the special nature of the financial market, it affects other parts of the economy. In light of the foregoing considerations, it may be concluded that stability of the banking system depends on both the banks themselves, as well as on institutions external in relation to banks.
THE PROBLEM OF THE CALCULATION OF THE FREQUENCY OF DIAGNOSTIC EXAMINATIONS BASED ON DEVICE’S PROPER OPERATION TIME
- Jacek Rudnicki
2015 Pełny tekst Journal of Polish CIMEEAC
The paper presents the proposal to apply the normal distribution to solve the problem of the frequency of diagnostic tests. Particular emphasis is placed on simplicity of the method. This method may be useful for the average user technical system. The method reduces the number of assumptions to a minimum. The results do not raise of serious doubts but they require verification of course.
The process of identification of the track's geometrical layout and the alignment project based on the of satellite measurements
- Władysław Koc
- Piotr Chrostowski
- Katarzyna Palikowska
2015
In the paper a methodology of restoring of railway track’s geometrical shape in a horizontal plane on the base of conducted mobile satellite surveying was presented. The authors proposed a calculating algorithm for designing the track sections placed in horizontal arcs. In the algorithm an analytical methodology with mathematical formulas is applied. The procedure has an universal character, i.e. provides the possibility of varying both the length and types of the transition curves. The calculation algorithm is implemented in the author's computer program. In that program, the identification process of existing arc parameters takes place in the defined system of track's main directions. After that, new values of parameters of obtained layout are estimated in an optimization process in which the assumed criteria concerns the minimization of displacements of the existing track. The estimation of the arc's parameters provides a base for the calculation of the main data for the track axis alignment project. In a such project it is also possible to apply the proposed calculation method with the presented in the paper analytical formulas. However, unlike to the case of the track axis identification process, this time the second criterion was proposed. This criterion is a train velocity what provides a possibility of obtaining the optimal adjustment project from the view point of a track's exploitation.
The Proposal to “Snapshot” Raim Method for Gnss Vessel Receivers Working in Poor Space Segment Geometry
- Aleksander Nowak
2015 Pełny tekst Polish Maritime Research
Nowadays, we can observe an increase in research on the use of small unmanned autonomous vessel (SUAV) to patrol and guiding critical areas including harbours. The proposal to “snapshot” RAIM (Receiver Autonomous Integrity Monitoring) method for GNSS receivers mounted on SUAV operating in poor space segment geometry is presented in the paper. Existing “snapshot” RAIM methods and algorithms which are used in practical applications have been developed for airborne receivers, thus two main assumptions have been made. The first one is that the geometry of visible satellites is strong. It means that the exclusion of any satellite from the positioning solution don’t cause significant deterioration of Dilution of Precision (DOP) coefficients. The second one is that only one outlier could appear in pseudorange measurements. In case of SUAV operating in harbour these two assumptions cannot be accepted. Because of their small dimensions, GNSS antenna is only a few decimetres above sea level and regular ships, buildings and harbour facilities block and reflect satellite signals. Thus, different approach to “snapshot” RAIM is necessary. The proposal to method based on analyses of allowable maximal separation of positioning sub-solutions with using some information from EGNOS messages is described in the paper. Theoretical assumptions and results of numerical experiments are presented.
The protection and monitoring of a distribution piping network for potable water supply
- Juliusz Orlikowski
- Kazimierz Darowicki
- Agata Jażdżewska
- Magdalena Jarzynka
2015 ANTI-CORROSION METHODS AND MATERIALS
Purpose – The purpose of this paper is to implement the corrosion protection method for steel pipes used in a municipal water-pipe network. Results of an inhibitor protection system installed on the system are presented. Inhibitor protection was required due to the high corrosivity of the water collected by a surface intake, which had resulted in a large number of failures and low water quality, due to the presence of corrosion products. Design/methodology/approach – To assess the effectiveness of protection and to control the optimum dose of the inhibitor dispensed, an automatic system of corrosion monitoring was used, together with an assessment of water corrosiveness based on measurements of physical and chemical properties of water. Findings – Calcium polyphosphate, in the role of a non-toxic corrosion inhibitor, showed significant effectiveness as a anticorrosive and its results were fully noticeable after several years following the commencement of protection. Corrosion monitoring has shown that the effectiveness of inhibitor protection is highest in the summer season, when the water is characterised as being in its most corrosive form. Originality/value – A reduction in the corrosion rate improves the quality of water and its chemical parameters fall within the standard range for water intended for consumption. The corrosion inhibitor action accelerates the formation of a layer limiting the corrosion rate. In this case, stable corrosion rates may be obtained after only the first year. In terms of the designing systems for monitoring corrosion in water systems, this is very important information as reliable results can be obtained for a long period after the launch of the system.
The Quality of the Outflow from Conventional WWTPs and Treatment Wetlands
- Hanna Obarska-Pempkowiak
- Magdalena Gajewska
- Ewa Wojciechowska
- Janusz Pempkowiak
2015 GeoPlanet: Earth and Planetary Sciences
Until recently the humic substances were considered to have no negative impact on human health. Therefore elimination of these substances from potable water was only performed due to aesthetic reasons. In the recent years, however, it was found out that humic substances may cause unacceptable smell of water or cumulate toxic substances by complexing metal ions and adsorption of persistent organic pollutants such as pesticides, PCB or phthalanes.
The risk assessment of adverse events of nursing activities as the element of quality management in healhcare
- Piotr Grudowski
- Małgorzata Wiśniewska
2015 Pełny tekst Management and Production Engineering Review
The purpose of the paper is to present MedCARVER+Shock method and Pareto analysis and its usability for the risk assessment of adverse events of nursing activities. 888 activities carried out by all 190 nurses working at the District Hospital X located in Poland were taken into account. During the research the qualitative approach was used. As the result sixteen groups of nursing activities causing the highest risk of adverse events were selected. Special attention required in: admission of a patient to the ward, sterilization, verbal communication with the patient, using of intravenous cannulas, needles, syringes, devices for transfusion of infusion liquids, servicing of hospital rooms, first aid in life-threatening situations, using medical devices and equipment. Ten basic causes of the risk of adverse events were identified, among others: lack of trainings, of modern equipment, of staff, failure to comply with procedures, lack of staff supervision, poor quality of ancillary materials, lack of management commitment. Finally MedCARVER+Shock method and Pareto analysis usability has been confirmed but it appeared that it is time-consuming and requires support from skilled professionals. Several suggestions have been put forward to improve the utility of MedCARVER+Shock.
The role of atmospheric precipitation in introducing contaminants to the surface waters of the Fuglebekken catchment, Spitsbergen.
- Katarzyna Kozak
- Krystyna Kozioł
- Bartłomiej Luks
- Stanisław Chmiel
- Marek Ruman
- Mariusz Marć
- Jacek Namieśnik
- Żaneta Polkowska
2015 Pełny tekst POLAR RESEARCH
Although the Svalbard Archipelago is located at a high latitude, far from potential contaminant sources, it is not free from anthropogenic impact. Towards the Fuglebekken catchment, in the southern part of Spitsbergen, north of Hornsund fjord, contaminants can be transported from mainland pollution sources. In the precipitation and surface water collected in the catchment, the following elements were detected and quantified: Ag, Al, As, B, Ba, Bi, Ca, Cd, Co, Cr, Cu, Cs, Mo, Ni, Pb, Sb, Se, Sr, Tl, U, Vand Zn. Additionally, pH, electrical conductivity and total organic carbon (TOC) were determined in those samples. The acidic reaction of precipitation waters was identified as an important factor intensifying the metal migration in this Arctic tundra environment. The air mass trajectory, surprisingly, explained the variability of only a small fraction of trace elements in precipitation water. The air mass origin area was correlated only with the concentrations of As, V and Cr. Wind directions were helpful in explaining the variability of Mn, U and Ba concentrations (eastnorth-easterly wind) and the contents of B, As, Rb, Se, Sr and Li in precipitation (south-westerly wind), which may indicate the local geological source of those. Atmospheric deposition was found to play a key role in the transport of contaminants into the Fuglebekken catchment; however, the surface water composition was modified by its pH and TOC content.
The role of organic and mineral constituents on kerogen transformation ratio
- Aleksandra Małachowska
2015
The main aim of this dissertation is to determine the role of mineral and organic matter constituents in kerogen transformation ratio. Practical aspects of the work include application of the results in the assessment of hydrocarbon production potential; to make process of hydrocarbon recovery more predictable consistent and efficient. The work used shale from the Vaca Muerta formation from the Nequen basin in Argentina. The formation is heterogeneous in relation to the organic and mineral matter, and also to pores structure and mechanical properties. The mineral and organic matter influences each other during kerogen transformation. As part of the evaluation of mineral and organic matter interactions author addresses the relationship between kerogen macerals and the bitumen type to which particular maceral transformed is addressed. There were two types of bitumen differentiated (bitumen I and bitumen II) using the FTIR technique. It was shown that bitumen I derive from fluorescent kerogen macerals and bitumen II from non-fluorescent macerals. During laboratory analysis the bitumen I is readily accessible by solvent extraction whereas bitumen II is retained, trapped within mineral matrix and requires alternative procedures to release it. Thus, in a real reservoir conditions bitumen II most likely will remain immobile. An important aspect of the research pertains to the analysis of potentially weak interfaces, which significantly influence the mechanical behavior of shales, including generation of branching and step-overs during hydraulic fracture propagation. This localized interface events are important to fracture length containment and the overall development of fracture geometry during fracturing operation. Most important interfaces defined in this work there are adjacent layers between rock matrix and volcanic ash, calcite veins, and between different lithologies. Understanding properties of these layers may help to estimate the economic potential of the play. This research integrates knowledge from multiple disciplines, including sedimentology, organic and mineral geochemistry, organic and mineral petrology with elements of geomechanics and provides broader characterization of shales, and to better define their producibility and economic potential. The research results not necessarily pertain to the Vaca Muerta formation only but can be generalized to enhance hydrocarbon recovery form geologically similar plays.
The role of the human factor in the companies' innovativeness
- Marzena Grzesiak
2015
Innovation is one of the factors enabling the development of both individual companies and entire economies. While previously the possibilities offered by technology were focused on, including information and communication technology (ICT), recently the potential of human resources has been gaining more and more attention. This capital — often underestimated — can in the right conditions and with a conducive organizational culture materially affect the competitive position of an enterprise. The role of the education system, in turn, is preparing staff with appropriate qualifications to be employed by enterprises.
The role of the sawage treatment plant in the removal of genotoxic compounds from the environment
- Monika Wieczerzak
- Błażej Kudłak
- Izabela Koss-Mikołajczyk
- Jacek Namieśnik
2015 Acta Biochimica Polonica
One reason for increased incidence of various types of cancer are environmental pollutants particularly of anthropogenic origin. All human activities may pollute the environment, but some have significant impact, just to mention energy industry, mining, transportation, chemical and petrochemical industries and housing. Environmental pollutants are a large group of compounds in terms of their physicochemical properties, some of which may disturb the biochemical processes going on in the living organism causing toxic and genotoxic effects. Surface water contaminated by urban and industrial effluents are becoming a wide reservoir of these compounds, and the current wastewater treatment technologies are not always able to meet this challenge. Research conducted in the Department of Analytical Chemistry in collaboration with the Department of food chemistry, technology and biotechnology were focused on the determination of genotoxic potential of wastewater samples. Samples of influent and effluent of wastewater were collected in 2013 from all the major sewage treatment plant sites across Poland. Genotoxic potential of the samples was analyzed by comet assay, using a HT29 cell line. Results obtained for the influent samples ranged from 5,91 to 44,44 percent of DNA in tail of the “comet”, and for those collected in the effluent form 5,32 to 50,96 percent of DNA. Comparing the results obtained for samples of wastewater there was an apparent decrease in genotoxicity for effluent samples, however, in a few cases, an increase of genotoxicity was observed for samples collected after the sewage treatment plant. Such cases can attest to the fact that some of the wastewater treatment techniques do not appear to be sufficient to remove compounds that could damage DNA and contribute to many cancer cases.
The Roughness of the Hardened Steel Surface Created by the Rolling-Burnishing Process
- Bogdan Ścibiorski
- Stefan Dzionk
2015 Solid State Phenomena
Burnishing hard materials can be used as an alternative finishing process. this paper presents the results of burnishing hardened steel. The article discusses surface deformation that occurs during this process and depends on the selected parameters of the geometric structure of the force applied for surface burnishing.
The searchlight problem for road networks
- Dariusz Dereniowski
- Hirotaka Ono
- Ichiro Suzuki
- Łukasz Wrona
- Masafumi Yamashita
- Paweł Żyliński
2015 Pełny tekst THEORETICAL COMPUTER SCIENCE
We consider the problem of searching for a mobile intruder hiding in a road network given as the union of two or more lines, or two or more line segments, in the plane. Some of the intersections of the road network are occupied by stationary guards equipped with a number of searchlights, each of which can emit a single ray of light in any direction along the lines (or line segments) it is on. The goal is to detect the intruder, that is, to illuminate its location. Guards may alter the direction in which they aim a searchlight, but need to switch it off for some finite time interval to effect the change. In contrast, the intruder may move with arbitrary speed along the network (but cannot pass guards) and exploit this time interval to recontaminate previously illuminated sections of the network. For various classes of road networks characterized by the number n of lines (or line segments) comprising it and the number g (≤n−1) of possible locations of guards (fixed in advance and guaranteed to give complete coverage), we present several upper and lower bounds on the worst-case number of searchlights, each placed at one of the guard positions, required to successfully search a given road network. In particular, we prove the following results: 1. min⁡{2g−1,n−2} searchlights are sometimes necessary and min⁡{7g/3,n}-1 are always sufficient for searching a road network given as the union of n lines; 2. Omega(g log(n/g)) searchlights are sometimes necessary and O(g^2⋅log⁡n) searchlights are always sufficient for searching a road network given as the union of n line segments, and 3. at most one searchlight per guard position, and hence a total of at most g searchlights, is always sufficient for searching a road network given as the union of axis-aligned lines or line segments. The proofs of the upper bounds induce algorithms for generating a search schedule for detecting the intruder using the claimed number of searchlights.
The secure transmission protocol of sensor Ad Hoc network
- Andrzej Marczak
2015 Zeszyty Naukowe Akademii Marynarki Wojennej
The paper presents a secure protocol of radio Ad Hoc sensor network. This network operates based on TDMA multiple access method. Transmission rate on the radio channel is 57.6 kbps. The paper presents the construction of frames, types of packets and procedures for the authentication, assignment of time slots available to the node, releasing assigned slots and slots assignment conflict detection.
The selected effects of high temperature air-steam mixture wood drying
- Aleksandra Konopka
- Jacek Barański
- Maciej Wierzbowski
2015 Pełny tekst Annals of WULS, Forestry and Wood Technology
The results of properties change of beech wood after drying process are presented. The wood taken to experiments was from northern part of Pomeranian region in Poland. Before the main high temperature drying process using air-steam mixture, wood was initially dried in an open air conditions. The high temperature drying process was conducted at temperature 120oC, humidity 48%, flow rate of drying medium 2.5m/s and atmospheric pressure. It allowed to reveal the effects of wood air-steam mixture and their temperature drying on wood properties. It has been recognized that air-steam mixture drying causes properties changes, such as deformation and stress of analysed wood species .