2017 - Publications Repository - Gdańsk University of Technology

Show publications from the year

Publications from the year 2017

Show all

The concept of streamlining the logistics processs at the company
- Radosław Drozd
- Marcin Kisielewski
2017 Research in Logistics & Production
The aim of the article is to present a concept related to the improvement of the logistics process at the company, by the modernisation of the main railway siding of the terminal. The paper present the reasons for the decision that was once made in order to obtain the expected advantages after the modernisation. The comparison of the incurred expenses and the profits that might be gained in the future allows us to state that the decision about the modernisation was the right one. The decision about the modernisation also referred to a trend towards an increase in cargo handling operations, which could be observed at the company at that time. The decision about modernisation was made when the terminal operated using its full capacities of the railway siding. Therefore, the modernisation was necessary in order to meet expectations expressed by the current and potential customers who might appear in the future.
The Contemporary aspects of revitalization of the buildings and the port areas
- Tomasz Szymański
2017
Port cities are the forefront of globalization. The continued growth of international trade of goods and services has now played a major role in shaping the economic and social world. Strategies for mutual cooperation and follow-up between countries, cities and regions are increasingly complex. On the one hand it brings profits, on the other leads to destabilization and the need for transformation and constant modernization. Port cities have begun the process of organizing both local and international networks, counting on a more effective impact on global strategies for their own economic and social development. The most important aspect of this goal is to ensure the coherence of cities and ports projects. It’s fundamental to define new rules for city and port coexistence and can only be achieved through a mutual dialogue based on the transparency of actions and plans for their sustainable development. It concerns developing new building standards, organization, control and risk prevention in the contact zones. The developmental capacities that port users expect met with cautious approaches by cities, responsible for long-term planning. In order to protect the areas not yet developed. The temporary forms of use are introducing until a specific spatial policy is defined and implemented. Consequently, in strategic locations their will prefer to locate reversible projects that will allow for change and alternative use. Years of the ports transformation in many parts of the world, in the city-port interrelationships, lead to the conclusion that only multifunctionality of use will facilitate this process. Revitalization of architectural objects forming part of the broadly understood industrial heritage is an increasingly dynamic area of both design and construction projects. Port cities demand exceptionally decisive action. This change is the result of a radical transformation of understanding of the philosophy of human functioning in the environment. Degree of environmental devastation, the technical and social transformations have led to the definition of new rules for the use of natural resources in a sustainable manner, ensuring their renewability.
THE COST ANALYSIS OF CORROSION PROTECTION SOLUTIONS FOR STEEL COMPONENTS IN TERMS OF THE OBJECT LIFE CYCLE COST
- Dariusz Kowalski
- Beata Grzyl
- Adam Kristowski
2017 Full text Civil and Environmental Engineering Reports
Steel materials, due to their numerous advantages - high availability, easiness of processing and possibility of almost any shaping are commonly applied in construction for carrying out basic carrier systems and auxiliary structures. However, the major disadvantage of this material is its high corrosion susceptibility, which depends strictly on the local conditions of the facility and the applied type of corrosion protection system. The paper presents an analysis of life cycle costs of structures installed on bridges used in the road lane conditions. Three anti-corrosion protection systems were considered, analyzing their essential cost components. The possibility of reducing significantly the costs associated with anti-corrosion protection at the stage of steel barriers maintenance over a period of 30 years has been indicated. The possibility of using a new approach based on the life cycle cost estimation in the anti-corrosion protection of steel elements is presented. The relationship between the method of steel barrier protection, the scope of repair, renewal work and costs is shown. The article proposes an optimal solution which, while reducing the cost of maintenance of road infrastructure components in the area of corrosion protection, allows to maintain certain safety standards for steel barriers that are installed on the bridge.
The Creation of an Antimicrobial Coating on Contact Lenses by The Use of Nanocopper
- Marcin Wekwejt
- Beata Świeczko-Żurek
2017 Full text International Journal of New Technology and Research
The aim of the research was to creation an antimicrobial coating on contact lens and examine the ability of copper nanoparticles to decrease microbial adhesion and prevent the growth of bacteria. The creation was based on the immersion method in solution with dispersed nanoparticles of copper at concentration 200 pm. There were evaluated follows factors: time of immersion and base to dispersed nanoparticles. Three solutions: ethyl alcohol 99.8%, lens liquid, and olive were tested and two variants of immersion, i.e.: double dipping for five seconds and immersion for a period of five minutes. The quality of the obtained coatings was controlled by using a biological microscope and a scanning electron microscope. Its effectiveness was tested by placing samples in the incubation medium of Staphylococcus aureus for 30 days.
The distributed model predictive controller for the nuclear power plant turbo-generator set
- Pawel Sokolski
- Tomasz Adam Rutkowski
- Kazimierz Duzinkiewicz
2017
Typically there are two main control loops with PI controllers operating at each turbo-generator set. In this paper a distributed model predictive controller DMPC, with local QDMC controllers for the turbine generator, is proposed instead of a typical PI controllers. The local QDMC controllers utilize step-response models for the controlled system components. These models parameters are determined based on the proposed black-box models of the turbine and synchronous generator, which parameters are identified on-line with the RLS algorithm. It has been found that the proposed DMPC controller realize the reference trajectories of the effective power and the angular velocity, and damp generator voltage oscillations with satisfactory quality in comparison to the typical control structure with the PID controllers.
The Dominant Influence of Plastic Deformation Induced Residual Stress on the Barkhausen Effect Signal in Martensitic Steels
- Leszek Piotrowski
- Marek Chmielewski
- Zbigniew Kowalewski
2017 Full text JOURNAL OF NONDESTRUCTIVE EVALUATION
The paper presents the results of investigation of the influence of plastic deformation on the magnetic properties of martensitic steel (P91 grade). The properties of the hysteresis loops as well as of the Barkhausen effect (BE) signal are analysed for both tensile and compressive loading up to ε = 10% of plastic deformation. The choice of the steel and of the deformation range is unique, since for such combination one can expect high residual stresses (both compressive and tensile) in the material that does not exhibit saturation of the BE intensity as a function of elastic stress. The obtained relationships show that for the low level of deformation the dislocation density changes may play a dominant role, yet for higher deformation level the residual stress becomes a dominant factor. It leads to the strong decrease of the BE signal for tensile deformation and an increase for the case of compression. It agrees well with the assumption that the tensile plastic deformation results in the compressive stresses appearance in the soft (magnetically active) subregions of the material whereas for the compression one can expect a residual stress of a tensile nature in those areas. Both deformation modes result in the increase of coercivity of the samples, yet the increase observed for the tensile deformation is significantly higher since both the residual compressive stress and increase of dislocation density have a strong effect on the material coercivity. The change of the hysteresis loops steepness agrees well with the notion of the dominant role of residual stresses too.
The dynamics of total outputs of Indonesian industrial sectors: A further study
- Ubaidillah Zuhdi
2017 Full text Journal of Physics : Conference Series
The purpose of the current study is to extend the previous studies which analyze the impacts of final demands modifications on the total outputs of industrial sectors of a particular country. More specifically, the study conducts the analysis regarding the impacts on the total outputs of Indonesian industrial sectors. The study employs a demand pull Input-Output (IO) quantity model, one of the calculation instruments in the IO analysis. The study focuses on seventeen industries. There are two scenarios used in this study, namely other final demands and import modifications. The “whole sector change” condition is implemented in the calculations. An initial period in this study is 2010. The results show that the positive impacts on the total outputs of focused sectors are distributed by scenario 1, the change of other final demands. On the contrary, the negative impacts are delivered by scenario 2, the modification of imports. The suggestions for improving the total outputs of discussed industries are based on the results.
The dynamics of total outputs of Indonesian industrial sectors: A further study
- Ubaidillah Zuhdi
2017 Full text Journal of Physics : Conference Series
The purpose of the current study is to extend the previous studies which analyze the impacts of final demands modifications on the total outputs of industrial sectors of a particular country. More specifically, the study conducts the analysis regarding the impacts on the total outputs of Indonesian industrial sectors. The study employs a demand-pull Input-Output (IO) quantity model, one of the calculation instruments in the IO analysis. The study focuses on seventeen industries. There are two scenarios used in this study, namely other final demands and import modifications. The "whole sector change" condition is implemented in the calculations. An initial period in this study is 2010. The results show that the positive impacts on the total outputs of focused sectors are distributed by scenario 1, the change of other final demands. On the contrary, the negative impacts are delivered by scenario 2, the modification of imports. The suggestions for improving the total outputs of discussed industries are based on the results.
The effect of current delay angle on tripping of residual current devices
- Stanisław Czapp
- Jacek Horiszny
2017
Power electronics converters applied in domestic or similar installations may utilize current delay (phase) angle control to change the level of transferred power. Due to application of such types of converters, earth fault current in the installation may be strongly distorted. The current distortion level depends on a value of current delay angle. This delay angle also influences the tripping threshold of residual current devices. In this paper, computer modelling of the impact of current delay angle on behaviour of residual current devices is conducted. Results of laboratory tests of the tripping of residual current devices are discussed. Conclusions regarding electrical safety are presented as well.
The effect of fishing basin construction on the behaviour of a footbrdge over the port channel
- Łukasz Pyrzowski
- Mikołaj Miśkiewicz
- Jacek Chróścielewski
2017 Full text Polish Maritime Research
The paper analyses possible causes of failure of the rotating footbridge over the Ustka port channel. In July, 2015, strange behaviour of this object was observed in the form of excessive vibrations of bridge platform suspension rods, with the accompanying acoustic effects. A preliminary geotechnical analysis has revealed that this destructive effect was caused by the nearby construction works, namely construction of a fishing basin and communication routes in the area close to the bridge, which affected the bridge lashing rod foundation settings. Ground vibrations generated by certain construction activities were likely to have direct impact on decreasing the bearing capacity of these rods and increasing the susceptibility od the piles to extraction. After detecting the above problems in bridge operation, its geodetic monitoring was started. The data recorded during this monitoring, along with the results of force measurements in the rods, have made the basis for a series of numerical simulations, performed in the Finite Element Method (FEM) formalism. The bridge structure was analysed in the conditions defined as the emergency state. Extreme efforts of bridge elements and its dynamic characteristics were examined. A possible source of strange behaviour of the footbridge during its operation which was recognised during these simulations was the coincidence of the global natural frequency of the entire bridge structure with local vibrations of suspension rods, at the frequency approximately equal to 1 Hz. This situation was likely to lead to the appearance of the so-called internal resonance phenomenon. As a final conclusion of the research, recommendations were formulated on possible object oriented corrective actions.
The Effect of Flexible Pavement Mechanics on the Accuracy of Axle Load Sensors in Vehicle Weigh-in-Motion Systems
- Piotr Burnos
- Dawid Ryś
2017 Full text SENSORS
Weigh-in-Motion systems are tools to prevent road pavements from the adverse phenomena of vehicle overloading. However, the effectiveness of these systems can be significantly increased by improving weighing accuracy, which is now insufficient for direct enforcement of overloaded vehicles. Field tests show that the accuracy of Weigh-in-Motion axle load sensors installed in the flexible (asphalt) pavements depends on pavement temperature and vehicle speeds. Although this is a known phenomenon, it has not been explained yet. The aim of our study is to fill this gap in the knowledge. The explanation of this phenomena which is presented in the paper is based on pavement/sensors mechanics and the application of the multilayer elastic half-space theory. We show that differences in the distribution of vertical and horizontal stresses in the pavement structure are the cause of vehicle weight measurement errors. These studies are important in terms ofWeigh-in-Motion systems for direct enforcement and will help to improve the weighing results accuracy.
The effect of high pressure and subzero temperature on gelation of washed cod and salmon meat
- Edyta Malinowska-Pańczyk
- Ilona Kołodziejska
2017 Full text FOOD TECHNOLOGY AND BIOTECHNOLOGY
The objective of the present work is to examine the infl uence of pressure up to 193 MPa at subzero temperature (without freezing of water) on myofi brillar proteins of salmon and cod meat and on the properties of gels obtained from washed mince of these fi sh. The solubility of proteins from myofi brils of cod and salmon meat suspended in 100 mM KCl solution increased aft er treating the samples with pressure above 60 MPa. The results of SDS-PAGE analysis showed that under these conditions two myosin light chains, tropomyosin and troponin T were released from myofi brils. The solubility of proteins in 0.9 M NaCl solution of washed fi sh meat aft er pressure treatment at 60 MPa and –5 °C decreased to about 80–90 % and at 193 MPa and –20 °C to 60 %. Pressurization of cod meat decreased only slightly the solubility of proteins in SDS and urea solution and the solubility of salmon meat was similar to that in the unpressurized sample. There were no diff erences in the electrophoretic patt ern of proteins from untreated and pressurized cod and salmon meat in the range of 60 to 193 MPa and –5 to –20 °C. The pressure treatment of washed salmon and cod meat at a temperature below 0 °C induced gelation; on the other hand, hardness of gels was lower by 28 and 26 %, respectively, than that of gels formed by heating. The salmon and cod gels pressurized at 193 MPa and –20 °C and then heated were much harder than only pressurized or heated gels.
The effect of high pressure and sub-zero temperature on total antioxidant capacity and the content of vitamin C, fatty acids and secondary products of lipid oxidation in human milk
- Dorota Martysiak-Żurowska
- Małgorzata Puta
- Natalia Barczak
- Edyta Malinowska-Pańczyk
- Bogumiła Kełbratowska
- Ilona Kołodziejska
2017 Full text Polish Journal of Food and Nutrition Sciences
The objective of this study was to compare of the effects of high pressure of 193 MPa at - 20°C and Low Temperature Long Time pasteurization (LTLT or holder pasteurization, 62,5°C; 30 min) on the content and composition of fatty acids (FAs), concentrations of secondary products of lipid oxidation (TBARS), the total antioxidant capacity (TAC), total vitamin C and ascorbic acid (AsA) content in human milk. It was shown that no significant changes in the content and composition of FAs and TBARS levels were noted in both pressurized and LTLT pasteurized milk samples. The results obtained indicate that the antioxidant properties in pressurized human milk were also not affected. It has been shown that in the case of pasteurized samples only slight (approx. 6%) and non-statistically significant decrease in the Trolox equivalent antioxidant capacity (TEAC) values was observed. Pasteurization significantly reduced the content of total vitamin C and AsA, by 35% and 24%, respectively. A minor and statistically non-significant (approx. 6%) decrease in vitamin C levels was observed in milk treated by high pressure. However, significant lowering, by morethan 11%, in AsA concentrations occurred in these conditions. The influence of high pressure treatment on AsA levels and the lack of significant changes in TEAC values point to the relative stability of the remaining antioxidant components in human milk. Further research is needed to determine the effects of high pressure of approximately 200 MPa and sub-zero temperatures on, mainly thermolabile, components of human milk, which are degraded by LTLT pasteurization.
The effect of lyophilization on selected biologically active components (vitamin c, catalase, lysozyme), total antioxidant capacity and lipid oxidation in human milk
- Dorota Martysiak-Żurowska
- Małgorzata Puta
- Anna Rodzik
- Edyta Malinowska-Pańczyk
2017 Full text Żywność. Nauka. Technologia. Jakość
Human milk is rich in polyunsaturated fatty acids, as well as lysozyme, vitamin C and other bioactive compounds. The effect of lyophilization on the content of antioxidants (vitamin C and catalase CAT), bactericidal compounds (lysozyme), total antioxidant capacity (TAC) and lipid peroxidation in human milk was investigated in this study. Samples of mature human milk were collected from five healthy women who gave birth on the scheduled date and without complications. Freeze drying resulted in the removal of 88.2% of the initial water content from milk. The human milk lyophilizate was readily soluble in water. Lyophilization had no effect on the content of primary (lipid peroxides LP) and secondary (thiobarbituric acid reactive substances TBARS) products of lipid oxidation. Freeze-drying led to a significant decrease in the vitamin C content and TAC values of milk (by 31% and 16.5%, respectively). Catalase and lysozyme were resistant to freeze-drying. Lyophilization induced a decrease in lysozyme content (9%) and catalase activity (11%) but these changes were not statistically significant. Low-temperature dehydration and rehydration of human milk lyophilizates promote satisfactory retention of biologically active ingredients and prevent the oxidation of human milk lipids. The results of this study indicate that lyophilization can be considered as an effective method for prolonging the shelf life of human milk.
The effect of microemulsion composition on the morphology of Pd nanoparticles deposited at the surface of TiO2 and photoactivity of Pd-TiO2
- Marta Długokęcka
- Justyna Łuczak
- Żaneta Polkowska
- Adriana Zaleska-Medynska
2017 APPLIED SURFACE SCIENCE
A series of microemulsion (ME) system, constituted by different water to surfactant molar ratios (Wo) and oil to surfactant mass ratios (S), have been applied for Pd-TiO2 preparation. The effect of ME properties on the morphology of Pd nanoparticles formed at TiO2 surface and an effect of Pd size and distribution on the surface and photocatalytic properties of Pd-TiO2 were investigated. Microemulsion systems were characterized by means of viscosity, density, dynamic light scattering as well as surface tension measurements to find a correlation between the conditions of Pd nanoparticles formation, their morphology and photocatalyst features. The photocatalysts were characterized by transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), UV–vis diffuse-reflectance spectroscopy (DRS), BET surface area and elemental analysis. The photocatalytic properties of Pd-modified TiO2 particles were studied in a model reaction of phenol photodegradation under Vis irradiation, as well as active species involved in the photocatalytic reaction were determined. Microemulsion composition was found to be a crucial parameter in determining the features of the TiO2-based photocatalysts covered by metallic nanoparticles. The highest photocatalytic activity under Vis radiation was observed for the Pd-TiO2 sample (average diameter 2.4 nm) obtained using 0.1 mol% Pd in the ME system containing 1.5 wt% of water and 82.8 wt% of cyclohexane with average droplet size of 2.83 ± 0.18 nm. In this regard, synthesis of such metal-semiconductor composites through the microemulsion route should always be preceded by investigation of ME properties in order to the eliminate the inhibitory effect of ME internal structure.
The effect of package type on selected parameters of nutritional quality of the chilled stored red sauerkraut
- Joanna Kapusta-Duch
- Barbara Kusznierewicz
- Teresa Leszczyńska
- Barbara Borczak
2017 Full text JOURNAL OF FOOD PROCESSING AND PRESERVATION
The key elements responsible for the quality of food are the technologies used toprocess raw materials and preserve obtained products. The aim of this paper wasto investigate the effect of package type (bags made from low density polyethylene[PE-LD] and the metallized polyethylene terephthalate [PET met/PE foil]) onselected quality parameters of the chilled stored red sauerkraut. Vegetables wereanalyzed before packaging and after 1, 2, 3 and 4 months of chilled storage in twotypes of a package. It has been found that the package type used had no statisti-cally signiﬁcant (P > 0.05) effect on v itamin C, total polyphenols, thiocyanatescontents and antioxidant activity of the chilled stored red sauerkraut .
The effect of processing on the safety and nutritional value
- Zdzisław E. Sikorski
- Hanna Staroszczyk
2017
Agricultural crops as well as animal food raw materials are usually somehow processed before being used by humans. Processing should make them more useful, increase their safety and nutritional value, extend the shelf life, and modify the sensory properties. However, changes and interactions of various compounds in the conditions of processing may generate products toxic or otherwise unsafe for the human organism. The food industry endeavors to find and apply processes that do not adversely affect the desirable properties of the products. The aim of the processor or cook is to maximize the beneficial and minimize the undesirable effects. Disseminating knowledge on the occurrence and properties of the harmful compound in foods may help in achieving this goal.
The effect of tyre rubber grinding method on the rubber-asphalt binder properties
- Maciej Sienkiewicz
- Kaja Borzędowska-Labuda
- Sebastian Zalewski
- Helena Janik
2017 CONSTRUCTION AND BUILDING MATERIALS
Rubber products, especially those used in the automotive industry, are responsible for a significant amount of waste, mainly in the form of worn tyres. One way to recycle tyres is to use them as an asphalt binder modifier. The properties of rubber-asphalt binders vary greatly depending on the morphology of the ground tyre rubber (GTR) grains and the type of tyre to be recycled (car/truck). The paper presents the results of research in the field of rubber-asphalt binders modified with two types of GTR (which differ in grain morphology) used in various amount and processed at different mixing devices. One GTR is obtained with the use of a standard knives granulator (standard granulation process – SGP), and the other by a special flat die pelleting press (flat-die granulation process - FDGP). It has been proved that GTR grinding method affects its specific surface area, thus the properties of rubber-asphalt binders.
The Effect of University Campuses on the Modal Split of Polish Cities
- Romanika Okraszewska
- Aleksandra Romanowska
- Kazimierz Jamroz
2017
The article considers the effect Polish public universities have on the characteristics of urban traffic. The article describes how the public university community has changed over 25 years and its share in the urban population. The characteristics of the modal split in Polish university towns is given based on selected cases. The relation between the share of transport modes in the modal split and the size of towns or university communities in total population is analysed. A description is given of the possibilities and justification to optimise urban modal split by managing the mobility of university community populations.
The effect of UV-C irradiation on lipids and selected biologically active compounds in human milk
- Dorota Martysiak-Żurowska
- Małgorzata Puta
- Joanna Kotarska
- Katarzyna Cybula
- Edyta Malinowska-Pańczyk
- Ilona Kołodziejska
2017 Full text INTERNATIONAL DAIRY JOURNAL
The effect of UV-C irradiation of human milk on lipid oxidation, content of antioxidants (vitamin C and catalase, CAT) and bactericidal compounds (lysozyme), as well as the total antioxidant capacity (TAC), of the breast milk was investigated. In parallel, the extent of inactivation of some bacteria was also determined. UV-C at doses from 85 to 740 J L−1 caused total inactivation of Escherichia coli and Staphylococcus aureus, but bacteria of the genus Enterococcus were reduced only partially. There was a significant increase in content of primary (lipid peroxides, LP) and secondary (thiobarbituric acid reactive substances, TBARS) oxidation products of lipids (by 33% and 36%, respectively) but decreased vitamin C and lysozyme content (by 35% and 41%). UV-C had no effect on the value of the TAC and caused a smaller decrease in CAT activity (by 14%) than conventional pasteurisation (by 60%).