2012 - Repozytorium publikacji - Politechnika Gdańska

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Publikacje z roku 2012

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The evaluation of the vibration measurement usability of electronic indicator lemag "premet C"
- Jacek Rudnicki
2012 Pełny tekst Journal of Polish CIMEEAC
The measuring possibilities of modern compression and combustion pressure analyzers are extended with additional functions. One of them is parallel to the pressure measurement, the measurement of vibrations in the region of the cylinder head. The paper presents a general assessment of the vibration measurement function of the electronic indicator LEMAG "PREMET C". This feature is very rarely offered by manufacturers of these devices. Based on experience summarizes the advantages and disadvantages of this method with the use of this device.
The First Dinuclear Nickel(II) Thiosulfate Obtained From Oxidation of Tri-tert-butoxysilanethiol. Contributions to the Chemistry of Silicon-Sulfur Compounds No. 78[1]
- Agnieszka Pladzyk
- Natalia Daca
- Łukasz Ponikiewski
2012 ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
Prezentowany związek {[Ni2(μ-S2O3)2(C7H9N)4-H2O]C7H8} (1) jest pierwszym tiosiarczanem metalu otrzymanym w wyniku utlenienia silanotiolu. Mechanizm tej reakcji zakłada powstawanie (RO)3SiSSSi(OR)3 jako jako produktu pośredniego. Bimetaliczny związek niklu(II) posiada dwie reszty tiosiarczanowe pełniące rolę liganda zarówno -S,O chelatującego jak i S-mostkującego łączącego oba centra metaliczne. Związek krystalizuje jako dimer z cząsteczkami związku połączonymi wiązaniami wodorowymi i z cząsteczkami toluenu jako rozpuszczalnika. Jony niklu(II) posiadają geometrię oktaedryczną z NiN2O2S2 rdzeniem. Struktura kompleksu została obliczona za pomocą analizy rentgenostrukturalnej. Dodatkowo związek został scharakteryzowany spektroskopowo w podczerwieni w ciele stałym i za pomocą analizy elementarnej.
The gaseous messenger carbon monoxide is released from the eye into the ophthalmic venous blood depending on the intensity of sunlight
- Marek Koziorowski
- S. Stefańczyk-Krzymowska
- A. Tabęcka-Łonczyńska
- P. Gilun
- Marian Antoni Kamiński
2012 JOURNAL OF BIOLOGICAL REGULATORS AND HOMEOSTATIC AGENTS
Circadian and seasonal rhythms in daylight affect many physiological processes. In the eye, energy of intense visible light not only initiates a well-studied neural reaction in the retina that modulates the secretory function of the hypothalamus and pineal gland, but also activates the heme oxygenase (HO) to produce carbon monoxide (CO). This study was designed to determine whether the concentration of carbon monoxide (CO) in the ophthalmic venous blood changes depending on the phase of the day and differing extremely light intensity seasons: summer and winter. The concentration of CO in the venous blood flowing out from the nasal cavity, where heme oxygenase (HO) is expressed, but no photoreceptors, was used as a control. Sixteen mature males of a wild boar and pig crossbreed were used for this study. Samples of ophthalmic and nasal venous blood and systemic arterial and venous blood were collected repeatedly for two consecutive days during the longest days of the summer and the shortest days of the winter. The concentrations of CO in blood samples was measured using a standard addition method. During the longest days of the summer the concentration of CO in ophthalmic venous blood averaged 3.32 ± 0.71 and 3.43 ± 0.8 nmol/ml in the morning and afternoon, respectively, and was significantly higher than in the night averaging 0.89 ± 0.12 nmol/ml (p<0.001). During the shortest day of the winter CO concentration in ophthalmic venous blood was 1.11 ± 0.10 and 1.13 ± 0.14 nmol/ml during the light and nocturnal phase, respectively, and did not differ between phases, but was lower than in the light phase of the summer (p<0.01). The CO concentration in the control nasal venous blood did not differ between seasons and day phases and was lower than in ophthalmic venous blood during the summer (p<0.01) and winter (p<0.05). The results indicate that the gaseous messenger carbon monoxide is released from the eye into the ophthalmic venous blood depending on the intensity of sunlight.
The homotopy type of the space of gradient vector fields on the two-dimensional disc
- Piotr Bartłomiejczyk
- Piotr Nowak-Przygodzki
2012 GLASGOW MATHEMATICAL JOURNAL
We prove that the inclusion of the space of gradient vector fields into the space of all vector fields on D^2 non-vanishing in S^1 is a homotopy equivalence
The impact of precipitation and external carbon source addition on biological nutrient removal in activated sludge systems – experimental investigation and mathematical modeling
- Jacek Mąkinia
- Jakub Drewnowski
- Marek Swinarski
- Krzysztof Czerwionka
- Magdalena Kaszubowska
- Joanna Majtacz
2012 Water Practice and Technology
The aim of this study was to determine the effects of chemical precipitation and addition of external carbonsources on the denitrification capability and enhanced biological phosphorus removal (EBPR) interactions atthe ‘Wschod’ WWTP (600,000 PE) in Gdansk (northern Poland). For this purpose, different kinds of batch experimentswere carried out with the settled wastewater (without pretreatment and after coagulation-flocculation)and external carbon sources (ethanol and fusel oil). Precipitation of colloidal and particulate organic fractionshas a significant effect on denitrification and EBPR. The removal of these two fractions by coagulation-flocculationresulted in the reduced process rates (30–70%). The experimental investigations were supported by both labscaleand full-scale simulations using a newly developed model as an expansion of the Activated SludgeModel No. 2d (ASM2d). The new model accurately predicted the effects of precipitation and external carbonaddition in batch experiments. Full-scale simulations revealed that addition of external carbon source can compensatethe effects of precipitation resulting in a similar NO3-N behavior compared to the reference case (withoutprecipitation and external carbon addition). The combined effects of precipitation and addition of external carbonsource resulted in a significantly different PO4-P behavior compared to the reference case.
The impact of precipitation and external carbon source addition on biological nutrient removal in activated sludge systems - experimentalinvestigation and mathematical modeling
- Jacek Mąkinia
- Jakub Drewnowski
- Marek Swinarski
- Krzysztof Czerwionka
- Magdalena Kaszubowska
- Joanna Majtacz
2012 Water Practice and Technology
The aim of this study was to determine the effects of chemical precipitation and addition of external carbonsources on the denitrification capability and enhanced biological phosphorus removal (EBPR) interactions atthe 'Wschod' WWTP (600,000 PE) in Gdansk (northern Poland). For this purpose, different kinds of batch experimentswere carried out with the settled wastewater (without pretreatment and after coagulation-flocculation)and external carbon sources (ethanol and fusel oil). Precipitation of colloidal and particulate organic fractionshas a significant effect on denitrification and EBPR. The removal of these two fractions by coagulation-flocculationresulted in the reduced process rates (30-70%). The experimental investigations were supported by both labscaleand full-scale simulations using a newly developed model as an expansion of the Activated SludgeModel No. 2d (ASM2d). The new model accurately predicted the effects of precipitation and external carbonaddition in batch experiments. Full-scale simulations revealed that addition of external carbon source can compensatethe effects of precipitation resulting in a similar NO3-N behavior compared to the reference case (withoutprecipitation and external carbon addition). The combined effects of precipitation and addition of external carbonsource resulted in a significantly different PO4-P behavior compared to the reference case.
The impact of road network structure and mobility on the national traffic fatality rate
- Kazimierz Jamroz
2012 Pełny tekst Procedia - Social and Behavioral Sciences
W pracy określono wpływ wybranych miar struktury sieci drogowej i mobilności mieszkańców na wskaźnik śmiertelności w wypadkach drogowych na bazie dostępnych danych z wielu krajów świata. Opracowano wieloczynnikowe modele nieliniowe pozwalające na określenie wpływu wielu istotnych czynników: ekonomicznych, systemowych, motoryzacyjnych i infrastrukturalnych na bezpieczeństwo ruchu drogowego mierzonego wskaźnikiem śmiertelności RFR.
The impact of security aspects on functional safety analysis = Wpływ aspectów ochrony informacji na wyniki analiz bezpieczeństwa funkcjonalnego
- Tomasz Barnert
- Kazimierz Kosmowski
- Marcin Śliwiński
2012 Pełny tekst Journal of KONBiN
It can be said that a distributed control and protection system’s security level may have a significant impact on functional safety analyses and their results. However the issue of integrating those both aspects are difficult and usually is neglected during functional safety analyses. Known methods of functional safety analyses don’t take into consideration this kind of concept also. This paper discusses an attempt to integrate safety and security aspects with respect to functional safety analysis as a main one. It is based on proposed classification of communication channels used in the system and the level of system distribution. The functional safety analysis is performed at every stage of system lifecycle. The most important part is related to description of required safety functions and determining required safety integrity level for them. Moreover t he proposed concept should be taken into account on this stage, and assume that security should be considered as a risk parameter used in the functional safety analysis. On the other hand there is a verification of required SIL for designed safety-related system which implements safety function where security should be taken into consideration as well.
The impact of technological and structural changes in the national economy on the labour-capital relations
- Małgorzata Gawrycka
- Aneta Sobiechowska-Ziegert
- Anna Szymczak
2012 Pełny tekst Contemporary Economics
The aim of the research presented in this paper is to present the relations between labour and capital in the national economy, resulting from technological and structural changes taking place in the years 1991 to 2008. The structure of the paper is as follows. It first presents the functional determinants for the Polish economy in 1991-2008 affecting the phenomenon subject to study. Then it presents the preliminary analysis of relations between capital and labour and their impact on the GDP. In order to achieve the set empirical objective, in the last part of the paper the authors use the econometric methods of description and inference based on the concept of macroeconomic Cobb-Douglas production function in both static and dynamic approach.
The importance of the bottom layer in double-layer porous asphalt for noise reduction
- Ulf Sandberg
- Piotr Mioduszewski
2012 Journal of the Acoustical Society of America
Double-layer porous asphalt concrete (DPAC) surfaces are generally considered to be the acoustically most effective low noise road surfaces ready for implementation. While DPAC used on highways in warm climates may have an average life of around 8 years, in Scandinavia with severe winter climate DPAC usually survive only about 3 years; partly due to wear of studded tyres. An ongoing project in Sweden, applying DPAC and single-layer porous asphalt (PAC), the latter consisting of the top layer of the DPAC, on motorway E4 in Jönköping-Huskvarna, has revealed interesting performance. Initial noise reduction was 7.5 dB(A) compared to a set of reference surfaces (conventional SMA 0/16). Amazingly, after one year of operation this noise reduction is unchanged. Most interesting is that the noise reduction difference between the single-layer and double-layer PAC is approx. 5 dB(A). Since the single-layer PAC is identical to the 30 mm thick top layer in the DPAC (although 5-8 mm thicker), it follows that 2/3 of the noise reduction is due to the bottom layer of the DPAC; i.e. what lies approx. 35-40 mm below the top surface. The paper will discuss the effect of the bottom layer on the overall acoustical efficiency of the DPAC.
The importance of the shape of the protein–water interface of a kinesin motor domain for dynamics of the surface atoms of the protein
- Anna Kuffel
- Jan Zielkiewicz
2012 PHYSICAL CHEMISTRY CHEMICAL PHYSICS
A single kinesin motor domain immersed in water has been investigated using molecular dynamics. It has been found that local properties of water in the solvation shell change along with the nature of the neighboring protein surface. However, a detailed analysis leads to the conclusion that the geometrical features of hydrogen bonds and overall structure of kinesin hydration water are not very different from bulk water. The local values of diffusion coefficients (translational and rotational) of water adjacent to specific patches on the protein surface seem not to be correlated to the orientational ordering of hydration water, but instead they depend on spatial roughness and degree of exposure of the patch to the solvent. Finally, a relationship between the mobility of various surface atoms of the protein and the mean values of the diffusion coefficient of the adjacent water molecules has been observed. The latter finding suggests a close relationship between the dynamics of the inner kinesin movements and the behavior of solvation water which is in turn determined by the topography of the contact surface between the protein and the surrounding water molecules.
The importance of the shape of the protein-water interface of a kinesin motor domain for dynamics of the surface atoms of the protein
- Anna Kuffel
- Jan Zielkiewicz
2012 PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Single kinesin motor domain immersed in water has been investigated using molecular dynamics. It has been found that local properties of water in solvation shell change along with the nature of neighboring protein surface. However, a detailed analysis leads to the conclusion that the geometrical features of hydrogen bonds and overall structure of kinesin hydration water is not very different from bulk water. The local values of diffusion coefficients (translational and rotational) of water adjacent to specific patches on the protein surface seem not to be correlated to the orientational ordering of hydration water, but instead they depend on spatial roughness and degree of exposure of the patch to the solvent. Finally, a relationship between the mobility of various surface atoms of the protein and the mean values of diffusion coefficient of the adjacent water molecules has been observed. The latter finding suggests a close relationship between the dynamics of the inner kinesin movements and the behavior of solvation water which is in turn determined by the topography of contact surface between the protein and the surrounding water molecules.
The influence of biological environment on the appearance of silver-coated implants
- Beata Świeczko-Żurek
2012 Pełny tekst
Despite antibiotics preventive treatment before and after implantation, risk of infection is real. The infections at the implant surface developein a few months after applying them into the body. To prevent the development of bacteria and to reduce the risk of infection, implants coated with silver layer come into use. The paper presents the research results in biological environment on vein and orthopaedicimplants covered with silver.
The influence of different time duration of thermal processing on berries quality
- Patricia Arancibia-Avila
- Jacek Namieśnik
- Fernando Toledo
- Enrique Werner
- Alma Leticia Martinez-Ayala
- Nuria Elizabeth Rocha-Guzman
- Jose Alberto Gallegos-Infante
- Shela Gorinstein
2012 FOOD CONTROL
Oznaczano zawartość związków bioaktywnych (polifenole, flawonoidy, taniny, antocyjany i kwas askorbinowy) oraz poziom aktywności przeciwutleniającej próbek ekstraktów (wodnych, heksanowych i acetonowych) uzyskanych z różnych gatunków owoców jagodowych. Do pomiaru poziomu aktywności przeciwutleniającej wykorzystano takie testy jak ABTS, DPPH, FRAP i CUPRAC. Zbadano wpływ czasu trwania procesu obróbki termicznej na zawartość bioaktywnych i poziom aktywności przeciwutleniającej.
The influence of different time durations of thermal processing on berries quality
- Patricia Arancibia-Avila
- Jacek Namieśnik
- Fernando Toledo
- Enrique Werner
- Alma Leticia Martinez-Ayala
- Nuria Elizabeth Rocha-Guzman
- Jose Alberto Gallegos-Infante
- Shela Gorinstein
2012 FOOD CONTROL
Bioactive compounds (polyphenols, flavonoids, flavanols, tannins, anthocyanins and ascorbic acid) and the level of antioxidant activity by ABTS, DPPH, FRAP and CUPRAC of water, acetone and hexane extracts of Chilean 'Murtilla' (Ugni molinae Turcz) and 'Myrteola' berries (Myrtaceae, Myrteola nummularia (Poiret) Berg.), Chilean and Polish blueberries (Vaccinium corymbosum), Chilean raspberries (Rubus idaeus), and Polish black chokeberry (Aronia melanocarpa) were determined and compared. It was found that the contents of the bioactive compounds and the levels of antioxidant activities in used extracts differ significantly (P < 0.05). The correlation between the total polyphenols, flavanols and the antioxidant activities was significantly the highest in water, average in acetone and the lowest in hexane extracts. Fourier transform infrared (FTIR) spectroscopy was applied as an additional tool for the characterization of the water polyphenol extracts. Aqueous extracts of investigated berries were subjected to different times of thermal processing. Bioactive compounds and the levels of antioxidant activities by 2,2-Azino-bis (3-ethyl-benzothiazoline-6-sulfonic acid) diammonium salt (ABTS+); 1,1-Diphenyl-2-picrylhydrazyl method (DPPH); Ferric-reducing/antioxidant power (FRAP) and Cupric reducing antioxidant capacity (CUPRAC) after 10, 20, 40 and 60 min of thermal processing were determined and compared with non processed samples. It was found that the antioxidant activity only of berries subjected to thermal processing for 10 and 20 min did not differ from the non thermally processed studied berries, showing high correlation between the total polyphenols, flavanols and the antioxidant activities. In conclusion, thermal treatment of studied berries influences their quality: only berries after 10 and 20 min of thermal processing preserved their bioactivity.
The influence of elastic deformation on the properties of the magnetoacoustic emission (mae) signal for go electrical steel
- Leszek Piotrowski
- Marek Chmielewski
- Bolesław Augustyniak
2012 JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Zbadano własciwości sygnału emisji magnetoakustycznej (MAE) elektrotechnicznej stali GO poddanej deformacji plastycznej w temperaturze pokojowej
The Influence of Gas Mixture in the Glow-Discharge Nitriding Process of Austenitic Stainless Steel on Characteristic of Nitrided Cases
- Artur Sitko
- Marek Szkodo
- Maria Gazda
2012 Key Engineering Materials
Austenitic stainless steels characterize with excellent corrosion resistance, although low mechanical properties. In many cases that limits their exploitation in industrial applications. Moreover, austenitic stainless steel is susceptible to local corrosion in the presence of halide ions. In present works, it was emphasized that the nitriding of austenitic stainless steels gives some potential abilities to obtain beneficial effect of termochemical treatment on their mechanical properties and corrosion resistance. The nitriding process below the temperature of 450OC allows to achieve above mentioned effects. The low temperature of glow-discharge nitriding process causes the sufficient decrease of chromium mobility. It allows to obtain uniform microstructure which consists of supersaturated nitrogen austenite. The present works prove, that phase has some beneficial effect on mechanical properties and corrosion resistance of these steels. This paper presents investigations of nitrided cases after the glow-discharge nitriding process. The nitrided cases were obtained by using a different chemical composition of gas mixture at the temperature of 450OC. The glow-discharge nitriding process was carried out on austenitic stainless steel, grade of steel X5CrNi18-10. The chemical composition and phase identification of the nitrided cases were examined by using the glow-discharge optical emission spectrometry (GD-OES) and X-ray diffractometry (XRD)
The Influence of Selecting Regions from Endoscopic Video Frames on The Efficiency of Large Bowel Disease Recognition Algorithms
- Adam Blokus
- Adam Brzeski
- Jan Cychnerski
- Mateusz Jędrzejewski
2012
The article presents our research in the field of the automatic diagnosis of large intestine diseases on endoscopic video. It focuses on the methods of selecting regions of interest from endoscopic video frames for further analysis by specialized disease recognition algorithms. Four methods of selecting regions of interest have been discussed: a. trivial, b. with the deletion of characteristic, endoscope specific additions to the video, c. with a cropped square area and d. with a cropped circular area. All four methods have been evaluated in terms of their influence on the efficiency of a set of exemplary disease recognition algorithms [ref], which make use of neural networks and Support Vector Machines. Testing and evaluation have been performed by training the classifiers with an extensive cross-validation and further independent evaluation on a separate test set. The tests have been performed in an advanced testing environment, which is based on an extensive database of various cases, collected by the Medical University of Gdańsk. The article is concluded with the test results and their analysis. The most promising methods and algorithms have been singled out and directions for further research aiming at increasing their effectiveness in recognizing large intestine diseases have been specified.
The influence of selenium addition during seeds' germination on the biological properties of obtained sprouts
- Joanna Cyprys
- Milena Groszewska
- Joanna Wittbrodt
- Dominik Kołodziejski
- Anna Piekarska
2012
Selenium plays a vital role in human body, because in the form of aminoacids (Se-methionine, Se-cysteine) it is found in the active centres of over 25 enzymes, including those regarded as 'cytoprotective'. Unfortunatelly, its daily intake in Poland and other European countries is lower than predicted by dietary recommendations. The consequences of selenium deficiency in diet might be severe, including higher susceptibility to cardio-vascular diseases and inflammation, decline of immune function, increased susceptibility to cancer, type 2 diabetes and nervous system disorders.The aim of this study was to determine the influence of seed germination in the selenium enriched medium on biological properties of sprouts. For the experiments, the seeds of Brassica plants: white cabbage (Brassica oleracea var. capitata f. alba), broccoli (Brassica oleracea L. var. italica), mustard (Sinapsis alba), as well as rye seeds (Secale cereale) were germinated using water with or without selenium (SeO2) addition. Then, the antioxidant activity of extracts obtained from sprouts was assessed by spectrophotometric tests employing ABTS, DPPH or FC reagents. The same extracts were used to induce the activity of glutathione S-transferases in human colon cancer HT29 cell line. The Se presence during germination influenced both antioxidant potential of sprouts and their ability to induce enzymatic activities considered to contribute to the phase II biotransformation of xenobiotics. These results suggests that Se-enriched sprouts could be proposed as a health-promoting food product.
The influence of temperature on properties of the polymer flexible joint used for strengthening historical masonries
- Tomasz Falborski
- Arkadiusz Kwiecień
- Michał Strankowski
- Łukasz Piszczyk
- Robert Jankowski
2012 Wiadomości Konserwatorskie
A new method of repairing damaged structures by filling the cracks with a specially prepared elastomeric polymer mass has been recently proposed. This new and innovative technique, known as the Flexible Joint Method (FJM), is mainly dedicated to masonries and historical objects, where minimum intervention is permitted. The flexible joint bonds the disrupted elements and ensures further safe exploitation of a damaged structure. The aim of the present paper is to show the results of the experimental study focused on determining the properties of the polymer composite used for the injections. The polymeric specimens were subjected to static tension and compression tests. The DMA tests were performed to measure the glass transition temperature of an analyzed material and also to determine the elastic modulus (storage modulus), viscous modulus (loss modulus) and damping properties as a function of temperature. UWAGA Rok umieszczenia w bazie Web of Science 2013