2014 - Publications Repository - Gdańsk University of Technology

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Publications from the year 2014

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Superconducting properties and electronic structure of NaBi
- S. K. Kushwaha
- J. W. Krizan
- J. Xiong
- Tomasz Klimczuk
- Q. D. Gibson
- T. Liang
- N.p. Ong
- R. J. Cava
2014 JOURNAL OF PHYSICS-CONDENSED MATTER
Resistivity, dc magnetization, and heat capacity measurements are reported for superconducting NaBi. Tc, the electronic contribution to the specific heat γ, the ΔCp/γTc ratio, and the Debye temperature are found to be 2.15 K, 3.4 mJ mol−1 K−2, 0.78, and 140 K respectively. The calculated electron–phonon coupling constant (λep = 0.62) implies that NaBi is a moderately coupled superconductor. The upper critical field and coherence length are found to be 250 Oe and 115 nm, respectively. Electronic structure calculations show NaBi to be a good metal, in agreement with the experiments; the px and py orbitals of Bi dominate the electronic states at the Fermi Energy.
Superimposed ice as nutrient storage
- Krystyna Kozioł
- Katarzyna Kozak
- Żaneta Polkowska
2014
Nutrient cycling in the glacial environment is known from the perspective of meltwater release and snowpack elution processes, but the superimposed ice temporary storage remains poorly understood. In this study, the enrichment of superimposed ice in nutrient ions: nitrite, nitrate and ammonium was studied in more detail. The release of these ions from superimposed ice into a supraglacial stream was considered also, additionally considering phosphorus, which was not detected in the snowpack profile, but must have been more abundant elsewhere in the catchment. Nitrite and ammonium were enriched in the superimposed ice layer, and their peak concentrations in discharge formed by melting superimposed ice were also occurring later than for nitrate and phosphate. These two latter species were characterised by another concentration peak, which occurred after the glacial ice became exposed in the catchment.
Superkomputery do wspomagania procesów gospodarczych ze szczególnym uwzględnieniem sektora bankowego
- Honorata Balicka
- Jerzy Balicki
- Waldemar Korłub
- Jacek Paluszak
- Marcin Zadroga
2014 Full text Współczesna Gospodarka
W artykule omówiono wykorzystanie superkomputerów do wspomagania procesów gospodarczych ze szczególnym uwzględnieniem sektora bankowego. Odniesiono się do wybranych projektów wspierających rozwój gospodarczy w oparciu o superkomputery. W szczególności zaproponowano zastosowanie HPC do implementacji wybranych metod sztucznej inteligencji w bankowości, w tym oceny ryzyka wybranych przedsięwzięć. Zaproponowane podejście umożliwia znaczący wzrost konkurencyjności przedsiębiorstw, w tym banków, poprzez dodanie zaawansowanych funkcjonalności.
Supporting the development of clusters in Poland - dillemas faced by public policy
- Marita McPhillips
2014 Full text PRACE NAUKOWE UNIWERSYTETU EKONOMICZNEGO WE WROCŁAWIU
Clusters have proved to be an important source of competitiveness for the economic development of regions within the European Union. In recent years many countries in the EU and throughout the world have launched policies aimed at supporting the development of clusters. There are many examples of good practices in the field of cluster policy, but there is no single model that can be applied in all countries and regions. This paper addresses the need to develop a country-specific framework for supporting the development of clusters in Poland. The aim of this paper is to present outcomes of a study carried out in relation to the topic of cluster policy in Poland. This paper contributes in this respect to an ongoing debate in this field by identifiying the main areas of strategic choices on both national and regional levels. On the basis of these findings, recommendations for fostering cluster development in Poland are proposed. The proposed recommendations are consistent with the concept of smart specialisation advocated by the European Commision.
Surface irregularities as a complex signal of tool representation together with uneven displacement in respect to the workpiece
- Adam Boryczko
- Wojciech Rytlewski
2014 Full text Metrology and Measurement Systems
In a dynamic machining process, distortion in surface irregularity is a very complex phenomenon. Surface irregularities form a periodic representation of the tool profile with various kinds of disturbance in a broad range of changes in the height and length of the profile. To discern these irregularity disturbances, interactions of the tool in the form of changes perpendicular and parallel relative to the workpiece were analyzed and simulated. The individual kinds of displacement of the tool relative to the workpiece introduce distortions in the changes of height and length. These changes are weakly represented in standard height and length irregularity parameters and their discernment has been found through amplitude-frequency functions.
Surface properties and photocatalytic activity of KTaO3, CdS, MoS2 semiconductors and their binary and ternary semiconductor composites
- Beata Bajorowicz
- Anna Malankowska
- Michał Jerzy Winiarski
- Tomasz Klimczuk
- Adriana Zaleska-Medynska
2014 Full text MOLECULES
Single semiconductors such as KTaO3, CdS MoS2 or their precursor solutions were combined to form novel binary and ternary semiconductor nanocomposites by the calcination or by the hydro/solvothermal mixed solutions methods, respectively. The aim of this work was to study the influence of preparation method as well as type and amount of the composite components on the surface properties and photocatalytic activity of the new semiconducting photoactive materials. We presented different binary and ternary combinations of the above semiconductors for phenol and toluene photocatalytic degradation and characterized by X-ray powder diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) specific surface area and porosity. The results showed that loading MoS2 onto CdS as well as loading CdS onto KTaO3 significantly enhanced absorption properties as compared with single semiconductors. The highest photocatalytic activity in phenol degradation reaction under both UV-Vis and visible light irradiation and very good stability in toluene removal was observed for ternary hybrid obtained by calcination of KTaO3, CdS, MoS2 powders at the 10:5:1 molar ratio. Enhanced photoactivity could be related to the two-photon excitation in KTaO3-CdS-MoS2 composite under UV-Vis and/or to additional presence of CdMoO4 working as co-catalyst.
SUSHI - jak to ugryźć? Czyli o standaryzacji i gromadzeniu statystyk wykorzystania zasobów elektronicznych na przykładzie Biblioteki Głównej Gdańskiego Uniwersytetu Medycznego
- Piotr Damian Krajewski
2014 Full text Forum Bibliotek Medycznych
Statystyki wykorzystania dostarczają bibliotekarzom informacji niezbędnych przy podejmowaniu decyzji o zakupie dostępu do wybranych zasobów elektronicznych. W roku 2002 rozpoczął działalność międzynaro- dowy projekt COUNTER (Counting Online Usage of Networked Electronic Resources), którego celem było ujednolicenie raportów wykorzystania e-zasobów, a także uczynienie ich możliwie najbardziej miarodajnymi. W roku 2007 amerykańska organizacja NISO (National Information Standards Organization) zatwierdziła pro- tokół SUSHI (Standardized Usage Statistics Harvesting Initiative), umożliwiający automatyczne pobieranie raportów COUNTER, bez potrzeby logowania się w serwisach poszczególnych wydawców. Niniejszy referat charakteryzuje główne założenia projektu COUNTER oraz przedstawia strukturę powsta- łych w wyniku działalności tego projektu raportów wykorzystania e-czasopism oraz e-książek (COUNTER Code of Practice). Praca ta stanowić ma również zachętę do stosowania protokołu SUSHI jako podstawowego sposobu gromadzenia statystyk w standardzie COUNTER, dlatego opisano w niej model działania protokołu oraz rozwiązania wykorzystane w Bibliotece Głównej Gdańskiego Uniwersytetu Medycznego.
Symmetry-Breaking Bifurcation for Free Elastic Shell of Biological Cluster, Part 2
- Hanna Guze
- Joanna Janczewska
2014 Full text Milan Journal of Mathematics
We will be concerned with a two-dimensional mathematical model for a free elastic shell of biological cluster. The cluster boundary is connected with its kernel by elastic links. The inside part is filled with compressed gas or fluid. Equilibrium forms of the shell of biological cluster may be found as solutions of a certain nonlinear functional-differential equation with several physical parameters. For each multiparameter this equation has a radially symmetric solution. Our goal is to study the bifurcation which breaks symmetry. In order to establish critical values of bifurcation parameter and buckling modes we will investigate an appropriate linear problem. Our main result on the existence of symmetry-breaking bifurcation will be proved by the use of a variational version of the Crandall-Rabinowitz theorem.
Sympozjum "Przeprawa mostowa przez Wisłę koło Kwidzyna"
- Szczepan Gapiński
- Krzysztof Żółtowski
2014 Pismo PG
W artykule przedstawiono historię projektowania i budowy mostu przez Wisłę pod Kwidzynem w nawiązaniu do sympozjum, które odbyło się w Gdańsku w dniu 16.10.2014
Symulacja pracy mechanizmu prasującego pojazdu do usuwania odpadów z pojemników (PUOP)
- Jacek Kropiwnicki
- Jacek Czyżewicz
- Grzegorz Książek
- Mariusz Kopka
2014 Full text Autobusy. Technika, Eksploatacja, Systemy Transportowe
W pracy przedstawiono analizę pracy wybranego typu mechanizmu prasującego PUOP oraz wpływ różnych konfiguracji elementów składowych tego urządzenia na energochłonność pracy w warunkach przyjętego cyklu obciążenia. W tym celu wykorzystano model mechanizmu prasującego PUOP w formie grafów wiązań oraz wyniki pomiarów ciśnienia roboczego w siłownikach hydraulicznych mechanizmu prasującego w trakcie jednego pełnego cyklu pracy przeprowadzonych na śmieciarce Medium XL firmy Ekocel.
Symulator czasu rzeczywistego procesów reaktora jądrowego
- Tomasz Karla
- Jarosław Tarnawski
- Kazimierz Duzinkiewicz
2014
Symulacja procesów zachodzących w reaktorze jądrowym (RJ) może być wykorzystywana do różnych użytecznych celów: edukacyjnych, popularyzatorskich, badawczych, weryfikacji układów sterowania. W artykule przedstawiono proces budowy symulatora czasu rzeczywistego wybranych procesów RJ z uwzględnieniem różnych skali czasu tych procesów. Zaprezentowano podejście scentralizowane (jednoagentowe) i wieloagentowe wraz z analizą czasu wykonania pojedynczego kroku modelu oraz z propozycją interfejsu użytkownika.
Symulator sieci Ad Hoc
- Marek Blok
- Andrzej Marczak
2014 Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
W pracy przedstawiono symulator sieci Ad Hoc umożliwiający przeprowadzenie szerokiego zakresu badań. Jednym z nich jest modelowanie warstwy fizycznej oraz badanie jakości transmisji przedstawione w postaci wykresów bitowej stopy błędów BER (Bit Error Rate) i ramkowej stopy błędów FER (Frame Error Rate) w funkcji odległości pomiędzy terminalami ruchomymi. Terminale ruchome mogą znajdować się w pojazdach mechanicznych, statkach, śmigłowcach i samolotach. Przedstawione rozwiązanie oprócz badania samej warstwy fizycznej umożliwia również badanie komunikacji między terminalami ruchomymi oraz między terminalami ruchomymi i stacjami bazowymi w oparciu o zadany protokół komunikacyjny.
Synchronic digital stereophotography and photogrammetric analyses in monitoring the flow of liquids in open channels
- Artur Janowski
- Jakub Szulwic
2014
The authors present the results of their research into photogrammetric documents based on synchronic digital images. Examples presented in the paper indicate the value of synchronic stereophotography in registering phenomena connected with liquids. Combining synchronic stereophotography with photogrammetric methods has allowed the authors to develop an application useful for monitoring the flow of a liquid in an open channel.
Synchronous generator model taking into account the non-uniform saturation of the pole shoes
- Filip Kutt
- Michał Michna
- Grzegorz Andrzej Kostro
- Mieczysław Ronkowski
- Dominik Adamczyk
2014
For the evaluation of modern electric power systems with regard to their behavior, weight, and reliability a novel modeling and simulation tools have been developed. The paper presents circuit model of synchronous generator taking into account both the non-sinusoidal distribution of the stator and rotor winding, and non-uniform saturation of the pole shoes. This model is suitable for simulation of both salient and no-salient pole generators. Winding function approach is used to define the self and mutual inductance which has enabled to take into account the non-sinusoidal distribution of stator and rotor windings. The equivalent airgap length distribution function is used to model the shape of the salient pole rotor and non-uniform saturation of the pole shoe. Simulation and experimental tests were carried out to validate this modelling method. The developed model can be used to analyze an autonomous power systems, in which a single generator has a significant impact on the power quality
Synteza, właściwości i zastosowanie nowych (bio)degradowalnych poliestrouretanów.
- Joanna Brzeska
- Piotr Dacko
- Henryk Janeczek
- Helena Janik
- W. Sikorska
- Maria Rutkowska
- Marek Kowalczuk
2014 Full text Polimery
Artykuł stanowi przegląd literaturowy dotyczący badań nad syntezą i wybranymi właściwościami dwóch grup nowych (bio)degradowalnych poliestrouretanów. W skłąd jednego z nich wchodzi polilaktyd (PLA) a drugiego alifatyczno-aromatyczny kopolimer poli[(tereftalanu-1,4-butylenu-co-(adypinianu 1,4-butylenu)] (BTA) i/lub ataktyczny poli(RS]-3-hydroksymaślan (a-PHB).
Synthesis and antiproliferative activity of conjugates of adenosine with muramyl dipeptide and nor-muramyl dipeptide derivatives
- Monika Samsel
- Krystyna Dzierzbicka
- Piotr Trzonkowski
2014 BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
We synthesized a series of MDP(D,D) and nor-MDP(D,D) derivatives conjugated with adenosine through a spacer as potential immunosuppressants. New conjugates were evaluated on two leukemia cell lines (Jurkat and L1210) and PBMC from healthy donors.
Synthesis and application of tetrazole di and triamide derivatives in ion-selective membrane electrodes
- Agnieszka Pazik
- Anna Skwierawska
2014 SENSORS AND ACTUATORS B-CHEMICAL
A number of tetrazole diamides and triamides have been synthesized and applied as ion carries in ion-selective membrane electrodes. Their selectivity and sensitivity were studied towards alkali, alkaline earth, transition and heavy metal cations. it was found that membranes doped with 3 and 2-nitrophenyl octyl ether exhibit an almost theoretial Nernstian response for NH+ over relatively wide concentration range. Elestrodes with ionophores 4 and 5 with bis91-buthylpentyl) adipate show high affinity towards CD2+; another diamide with two plasticizers exhibits good selectivity fo Pb2+ ions.
Synthesis and characterization of mononuclear Zn(II), Co(II) and Ni(II) complexes containing a sterically demanding silanethiolate ligand derived from tris(2,6-diisopropylphenoxy)silanethiol
- Anna Dołęga
- Agnieszka Jabłońska
- Agnieszka Pladzyk
- Łukasz Ponikiewski
- Wiesława Ferenc
- Jan Sarzyński
- Aleksander Herman
2014 DALTON TRANSACTIONS
Four heteroleptic complexes of zinc(II), cobalt(II) and nickel(II) containing a monodentate silanethiolate ligand derived from tris(2,6-diisopropylphenoxy)silanethiol (TDST), were prepared and characterized. The geometries of ligands in the complexes are typical: distorted tetrahedral in zinc and cobalt(II) complexes and square planar in nickel(II) compound. Magnetic studies performed for Ni(II) and Co(II) compounds confirm the diamagnetic character of the first complex and high-spin paramagnetic configuration of the latter. Nickel(II) and cobalt(II) complexes were additionally characterized by infrared spectroscopy and the characteristic bands for NH3 molecules in the complexes were assigned with the help of the DFT vibrational frequency calculations.
Synthesis and Testing of BCZY/LNZ Mixed Proton–electron Conducting Composites for Fuel Cell Applications
- Krzysztof Zagórski
- Tadeusz Miruszewski
- Dagmara Grudzień
- Piotr Jasiński
- Maria Gazda
2014 Full text Procedia Engineering
A composite of BaCe0.6Zr0.2Y0.2O3–δ and Li2O:NiO:ZnO was investigated for fuel cell applications. The composite was successfully synthesized and its phase stability was confirmed at temperatures up to 900 °C. The influence of sintering and pressing aids on density was also investigated. Electrical properties were measured. DC electrical conductivity was about 8•10-4 S/m at 845 K. Open circuit voltage measurements in wet hydrogen have shown that the composite can be used in single layer fuel cells.
Synthesis and thermal studies of flexible polyurethane nanocomposite foams obtained using nanoclay modified with flame retardant compound
- Łukasz Piszczyk
- Magdalena Danowska
- Anna Mietlarek-Kropidłowska
- Magdalena Szyszka
- Michał Strankowski
2014 Full text JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
This work presents thermal studies of nanocomposites based on the flexible polyurethane (PU) matrix and filled using montmorillonite organically modified with organophosphorus flame retardant compound. Flexible PU nanocomposite foams were prepared in the reaction carried out between reactive alcoholic hydroxyl and isocyanate groups with the ratio of NCO to OH groups equal to 1.05. The amount of an organoclay ranging from 3 to 9 vol% was added to the polyol component of the resin before mixing with isocyanate. The apparent density of PU foams was ranging from 0.066 to 0.077 g cm-1. Thermal properties of the flexible PU nanocomposite foams were investigated by thermogravimetry and dynamical mechanical analysis. Glass transition temperatures (Tg) were defined as maximum peak on tand curve. Thermal decomposition was observed at 310–320 C (calculated from the onset of TG curve). Tensile strength of the PU foams was determined using mechanical test. The microstructure of the nanoparticles and the composites was investigated by X-ray diffraction. Finally, it was confirmed that the thermal and mechanical properties of flexible PU nanocomposite depend on the amount of nanoclay.