2013 - Repozytorium publikacji - Politechnika Gdańska

Pokaż publikacje z roku

Publikacje z roku 2013

Pokaż wszystkie

Separability in terms of a single entanglement witness
- Piotr Badziąg
- Paweł Horodecki
- Ryszard Horodecki
- Remigiusz Augusiak
2013 Pełny tekst PHYSICAL REVIEW A
The separability problem is formulated in terms of a characterization of a single entanglement witness. More specifically, we show that any (in general multipartite) state rho is separable if and only if a specially constructed entanglement witness W-rho is weakly optimal, i.e., its expectation value vanishes on at least one product vector. Interestingly, the witness can always be chosen to be decomposable. Our result changes the conceptual aspect of the separability problem and raises some questions about the properties of positive maps.
Separation of Volatile Oxygen-containing Organic Compounds by Gas Chromatography - selectivity comparison of different polarity stationary phases
- Grzegorz Boczkaj
- Patrycja Makoś
2013 Camera Separatoria
This paper present a results of the separation of 36 reference compounds belonging to the group of Volatile Oxygen-Containing Organic Compounds (OVOCs) using capillary gas chromatography with flame ionization detector (GC-FID) and three stationary phases of different polarity. A selectivity has been studied regarding to OVOCs and n -alkanes. The most useful for the separation of the group OVOCs is a polar ionic liquid stationary phase (SLB-IL 111) and the mid-polar column DB-624.
Serwer Diameter w architekturze Proxy Mobile IPv6
- Ariel Wymysłowski
- Michał Hoeft
2013 Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
W pracy przedstawiono mechanizmy współpracy serwera Diameter z systemem Proxy Mobile IPv6. Opisany został sposób integracji obu rozwiązań na potrzeby obsługi mobilności terminali ruchomych w sieci IPv6. W ramach realizowanych badań wykonano implementację opisanego systemu. Dla przygotowanej implementacji przeprowadzono szereg testów wydajnościowych uwzględniających parametry jakości QoS oraz QoE.
SESSILE DROPLET CONTACT ANGLE OF WATER-Al2O3, WATER-TiO2 AND WATER-Cu NANOFLUIDS
- Janusz Cieśliński
- Katarzyna Ronewicz
2013
The goal of the present work was the experimental determination of the contact angle of droplets of three nanofluids on various substrates. Of particular interest was effect of nanoparticle concentration on droplet contact angle.
Sestaveni Smerne Krivky Modulu Tuhosti Pro Zkoumani Nizkotrplotnich Vlastnosti (Developing of Stiffness Master Curve for Analysis of Low Temperature Properties)
- Mariusz Jaczewski
2013
V prispevku je predstaven novy postup pro sestrojeni smernych tuhostnich krivek. Nizkoteplotni vlastnosti asfaltove smesi byly stanoveny za vyuziti zkousky dotvarovani pri tribodovem ohybu. Motivem tohoto vyzkumu je skutecnost, ze metody hodnoceni nizkoteplotniho chovani asfaltovych smesi, nove zavedenych v Polsku, nejsou dostatecne. V zaveru jsou prezentovany smerne krivky tuhosti beznych asfaltovych smesi vyuzivanych v Polsku.
Several notes on technical modernization of a historical building
- Jarosław Bąkowski
2013
This paper describes methods and means used during the renovation process of several elements of a building – the assembly hall, inner courtyards and attics of the main building at Gdansk University of Technology, both in design and construction domains. A tissue of a historic building required special approach to these tasks, with special emphasis on good recognition of problems, careful planning and consistent implementing of proper solutions. Keywords: historic building refurbishment and modernization, technical equipment of historical building.
“Shadow” vs. “Phase 3D” method within endoscopic examinations of marine engines
- Zbigniew Korczewski
- Jacek Rudnicki
2013 Pełny tekst Combustion Engines
A visual investigation of surfaces creating internal, working spaces of marine combustion engines by means of specialized view-finders so called endoscopes is at present almost a basic method of technical diag-nostics. The surface structure of constructional material is visible during investigations like through the magnifying glass (usually with a precisely determined magnification), which makes possible a detection, recognition and if possible, quantitative evaluation of the failures and material defects appearing, and in result – an opinion of the waste degree and the dirt intensity of studied constructional elements. This is an especially important advantage while the failures do not generate observable values of diagnostic parameters. Endoscopic investigation of the machine being switched off from motion enables evaluation of its construc-tional elements’ waste and dirt almost at once. The paper deals with diagnostic issues concerning endoscopic examinations of the working spaces within marine diesel and gas turbine engines. In the beginning, endoscopy apparatus being on laboratory equipment of the Department of Ship Power Plants of Gdansk University of Technology in Poland has been characterized. The endoscopy considerations have been focused on theoretical bases of a digital image processing and especially - on the “Shadow” and “Phase 3D” measurement method. There has been carried out a comparative analysis of these methods’ efficiency and effectiveness in the real conditions of the diagnostic investigations performance of the engines built in the marine power plant.
Shaping the new planning curricula in the post-socialistic context lessons from Poland and Russia
- Piotr Lorens
- Dorota Dominika Kamrowska-Załuska
2013
Planning education is the issue widely discussed during various conferences and seminars, especially ones grouping the representatives of universities offering professional education in this field. But to large extend this discourse is dominated by the realities and specifics of the highly- developed countries, which is also reflected in the structure of the organizations of universities offering these. At the same time planning education in these countries is in many cases limited to socio-economic issues, with no attempt towards dealing with physical planning or urban design. This situation is characteristic to many highly developed countries, like Western Europe or North America. Different situation occur in the post-socialistic countries, where planning profession is traditionally dominated by graduates from the programs in architecture, frequently (and traditionally) treating planning as the “large scale architectural design”. Graduates of these programs have very little knowledge about the social and economic processes, and are not ready to deal with modern planning regulation making processes. At the same time the cities in Central and Eastern Europe (as well as in other post- socialistic countries, including ones in various parts of the world) are in desperate need of modern planning solutions and planners able to deal with their problems. But these involve both urban design and planning as well as development issues, also – emerging from the political and socio-economic specifics of these countries. The paper will include a presentation of the problems and specifics of planning education in the post-socialistic countries as well as key lessons emerging from the analysis of the already implemented new planning curricula. Its conclusions will include the set of recommendations to other institutions in need of curriculum reform and/or development, as many universities are nowadays introducing planning programs. The examples discussed will include the Polish and Russian cases, which were analyzed by the author during his academic career and contacts with various educational institutions in the Central and Easter Europe.
SHM System of the Roof Structure of Sports Arena “Olivia”
- Krzysztof Wilde
- Mikołaj Miśkiewicz
- Jacek Chróścielewski
2013
The paper presents a structural health monitoring system of the Sports Arena “Olivia” in Gdansk, Poland. The system was installed because of doubts about the roof stability due to observed buckling of the steel truss members. The SHM system was based on nonlinear FEM models used for detection of type of near failure modes of the roof. The application of detailed FEM model in current state updated on data from in situ loading testes allowed to trace large number of structural parameters necessary for precise identification of the roof structure condition.
Should Polish banks be domesticated?
- Krzysztof Postrach
2013
The financial crisis revealed vulnerabilities in the regulation and supervision of the banking system. The overarching goal of the proposal (Bazylea III and CRD IV) is to strengthen the resilience of the EU banking sector. The effects of these regulations will be detrimental to the Polish banking system and economy. This follows from the fact that listed banks in Poland are subsidiaries of international banking groups. The article considers the change in the ownership of those banks.
Should we seek further improvement of fluid film bearings - what for and how?
- Michał Wasilczuk
2013
Fluid film bearings have been extensively used in the industry because of their unbeatable durability and extremely low friction coefficient. Large bearings supporting shafts of huge and important rotating machines constitute a special group of fluid film bearings since the reliability of crucial systems, like for example electro-energetic system, rely on their trouble-free operation. Large thrust bearings, apart from enormous consequences of failures, can also be characterized by severe conditions of operation. Despite very low coefficient of friction, due to large diameters dissipation of energy in such bearings is noticeable. In the contemporary economy with ever growing demands for increased efficiency there is always a need for improving performance of the machines. Two main aspects of increasing the efficiency can be distinguished - one is literal - the machines have to be more efficient so the losses, including friction in the bearings, have to be minimized. Looking at the components of losses in fluid film bearings, one can notice that apart from unavoidable losses in the film, there are losses generated outside the film which can possibly be avoided or decreased by bearing modifications. Some other possibilities of decreasing energy losses in the fluid film bearings will also be discussed in the paper. Another aspect of increasing overall efficiency of the machines is decreasing their downtime and limiting the number and consequences of failures. Unfortunately in the hydrodynamic bearing there is a contradiction between energy efficiency and margin of safety, very well shown by the Striebeck curve. Therefore in order to allow more efficient, and in the same time more risky, bearing operation it is necessary to predict bearing performance using more accurate bearing models, but simultaneously it is also necessary to improve bearing diagnostic tools to be able to prevent their failures. This requires the development of measurement and diagnostic methods, as condition monitoring based only on direct temperature measurement proved to be ineffective in numerous cases. The idea of active bearings is probably one of the solutions combining both aspects of efficiency - they can be energy-efficient and reliable in the same time.
Siedziba rodu Zawadzkich z "ogrodem włoskim" w Waplewie Wielkim (ok. 1629-1759)
- Katarzyna Rozmarynowska
2013 Biuletyn Konserwatorski Województwa Pomorskiego
Zespół dworsko ogrodowy w Waplewie Wielkim znany jest przede wszystkim jako siedziba patriotycznej rodziny Sierakowskich (1760- 1968). Zanim jednak około 1760 roku trafił w jej ręce, to przez około 130 lat znajdował się w posiadania innej, mniej znanej ale również, podobnie jak Sierakowscy, bardzo zasłużonej dla Polski rodziny Rogalitów Zawadzkich. W artykule, który jest zaledwie wstępnym raportem z przeprowadzonych do tej pory badań autorka przedstawia wcześniejsze, mniej znane fakty z dziejów majątku waplewskiego i jego dziedziców z rodu Zawadzkich.
SILICA AEROGEL TOWARDS ANODES FOR LITHIUM-ION BATTERIES
- Beata Wicikowska
- Anna Lisowska-Oleksiak
2013 Biuletyn Polskiego Stowarzyszenia Wodoru i Ogniw Paliwowych
An increasing demand for electrochemical energy storage and conversion devices stimulates progress in research on electrode and electrolyte materials. In the field of electrodes materials, silicon is the one of the most promising anode materials for Li-ion batteries. However silicon has the drastic volume variation (around 3 times lower on extraction) during insertion and extraction of lithium ions. As an alternative, nanocomposites enabling compensation of this drastic volume changes are proposed. Among them are composites Si/C derived from SiO2/C material. Here we present our attempt to produce such nanocomposite. Material was prepared using silica aerogel as a matrix for preparation carbon nanomaterials. The morphology of the sample was determined using a scanning electron microscope (SEM). The chemical composition was determined by dispersive X-Ray detector attached to the SEM. Structure of the samples was measured by X-Ray diffraction, Raman spectroscopy and ATR-FTiR spectroscopy. The presence of silica proved by ATR-FTiR. The XRD pattern confirms that structure of our material is amorphous. Raman spectrum confirms presence of graphitized carbon as a well shaped D and G peaks were recorded. Prepared material was used as an electrode served as the working electrode Swagelok type testing cell. First stage was electrode formatting using potentiostatic polarizaton. We assumed that during electroreduction the chemical interaction between LixC and SiO2 may take place bringing about silicon. During following steps the composite electrodes have been tested using, electrochemical impedance spectroscopy, polarization techniques – chronopotentiometry and cyclic voltammetry.
Silicon Oxycarbide (SiOC) Ceramic Materials as Anodes for Lithium Ion Batteries
- Monika Wilamowska-Zawłocka
- V.s. Pradeep
- Magdalena Graczyk-Zajac
- Ralf Riedel
- G.d. Soraru
2013 Biuletyn Polskiego Stowarzyszenia Wodoru i Ogniw Paliwowych
Polymer derived ceramics (PDCs) have attracted attention as alternative anode material for Li-ion batteries. It has been found that ternary SiOC and SiCN ceramics obtained through pyrolysis of various preceramic polymers display high reversible capacities of 500 – 650 mAh/g. In this work we try to correlate the electrochemical performance of polymer derived silicon oxycarbide with its chemical composition and microstructural features. Various SiOC ceramics were prepared by pyrolysis of polysiloxanes ceramic precursors. Preceramic polymers were synthesized using the sol-gel method. In this way, by varying the sol-gel precursors, different polymers were obtained. In consequence, the final ceramic composition and microstructure can be tuned and controlled. The aim of the sol-gel synthesis was to obtain polysiloxanes with optimal composition in order to get high free carbon content in the final SiOC ceramic. The free carbon phase is considered to be a major lithium storage site [1], while the ceramic matrix is considered to play a stabilizing role. An increased fraction of free carbon was analyzed in the samples prepared from mixtures containing phenyl- and vinyl-substituted polysiloxanes. Raman spectra confirm the presence of disordered carbons by the appearance of a well pronounced D band. The carbon-rich SiOC samples exhibit higher capacity values and improved cycling stability compared to samples with low free carbon content. The best results are obtained for samples prepared at 1000 °C. An increase of the pyrolysis temperature impairs the electrochemical properties due to progressing carbon organization and crystallization of silicon carbide which is inactive vs. lithium insertion.
Simple and low-cost wireless voting system
- Mateusz Rzymowski
- Karol Bizewski
- Przemysław Woźnica
2013 Zeszyty Naukowe Wydziału Elektroniki i Informatyki
This paper presents the concept of a simple and low-cost wireless voting system working in the 868 MHz frequency band. The described system is dedicated to general shareholders assemblies but it can be easily adapted for other applications. The main advantage is its simplicity and mobility as it consists solely of three components - voting modules, a base station and a PC application from which the whole system is mamaged. This architecture allows one to move the system from place to place and organize the voting without limiting it to one location. In this article system layers were discussed. In the whole structure phydical, network, transport and application layers can be distinguished. Moreover, this paper contains test results covering range measurements, system capacity and its flexibility.
Simple and novel synthesis of 3-(thio)phosphoryl-β-lactams by radical cyclization
- Paweł Punda
- Sławomir Makowiec
2013 Pełny tekst NEW JOURNAL OF CHEMISTRY
Radical cyclization of phosphono-acetenamides promoted by manganese(III) acetate leads exclusively to the formation of 3-phosphoryl-β-lactams. The thiophosphoryl analogues were also prepared using this method. In particular, the presented protocol does not require the use of noble metals, while comparable methods do.
SIMPLIFIED DYNAMIC MODEL OF ROTATING BEAM
- Rafał Hein
- Cezary Orlikowski
2013 Pełny tekst Diagnostyka
In the paper a hybrid model of rotating beam is presented. It was obtained by using two methods: modal decomposition and spatial discretization. Reduced modal model was built for the system without the load related to inertia forces that occur during beam rotation. This inertia load was next modeled by using the method of simply spatial discretization and combined with reduced modal model. This approach allows to obtain accurate low-order model of rotating beam.
SIMULATION MODEL OF ASON/GMPLS ARCHITECTURE
- Sylwester Kaczmarek
- Magdalena Młynarczuk
- Paweł Zieńko
2013
Growing demands of information society concerned with sophisticated applications could be satisfied by ASON/GMPLS architecture comprehended as Automatically Switched Optical Network (ASON) with Generalized Multi-Protocol Label Switching (GMPLS). The ASON/GMPLS proposition represents the future direction of Next Generation Network (NGN) architecture. Therefore considerable work has to be done to examine this solution. In this aspect simulations models are necessary to investigate functionality of ASON/GMPLS architecture in different networks conditions. This paper is devoted to present a scalable and extensible simulation model of ASON/GMPLS architecture based on OMNeT++ discrete event simulator. The authors present the conception of the simulation model, its realization and exemplary tests results.
Simulation of fluid structure interaction in a novel design of high pressure axial piston hydraulic pump
- Leszek Osiecki
- Piotr Patrosz
- Bettina Landvogt
- Janusz Piechna
- Tomasz Zawistowski
- Bartek Żyliński
2013 Pełny tekst Archive of Mechanical Engineering
A novel type of an axial, piston-driven high pressure hydraulic pump with variable capacity marks a significant improvement in the area of the hydraulic machinery design. Total discharge from hydrostatic forces eliminates a need for a servomechanism, thus simplifying operation, reducing weight and introducing the possibility of the pump displacement control by computer. PWK-type pumps, invented in the Gdansk University of Technology, offer high efficiency for pressure levels up to 55 MPa, ability to work self sucking even at high speed. However, the heart of the new invention, the commutation unit, creates harmful pressure peaks. Those peaks can be mitigated by the introduction of a compensation chamber with elastic walls. Owing to the dynamic character of events taking place in the pump, a need for computer simulation arouse in order to understand phenomena leading to the occurrence of pressure peaks and choose compensation chamber parameters accordingly. A CFD package alone would not be sufficient to reliably represent the interaction between the compensation chamber wall and the working fluid. This paper presents Fluid Structure Interaction approach comparing 3 different models: 2 simplified models of the pump and a full pump model.
Simulation of fluid structure interaction in a novel design of high pressure axial piston pump
- Leszek Osiecki
- Piotr Patrosz
- Janusz Piechna
- Bettina Landvogt
- Bartek Żyliński
- Tomasz Zawistowski
2013 Pełny tekst Archive of Mechanical Engineering
A novel type of an axial, piston-driven high pressure hydraulic pump with variable capacity marks a significant improvement in the area of the hydraulic machinery design. Total discharge from hydrostatic forces eliminates a need for a servomechanism, thus simplifying operation, reducing weight and introducing the possibility of the pump displacement control by computer. PWK-type pumps, invented in the Gdansk University of Technology, offer high efficiency for pressure levels up to 55 MPa, ability to work self sucking even at high speed. However, the heart of the new invention, the commutation unit, creates harmful pressure peaks. Those peaks can be mitigated by the introduction of a compensation chamber with elastic walls. Owing to the dynamic character of events taking place in the pump, a need for computer simulation arouse in order to understand phenomena leading to the occurrence of pressure peaks and choose compensation chamber parameters accordingly. A CFD package alone would not be sufficient to reliably represent the interaction between the compensation chamber wall and the working fluid. This paper presents Fluid Structure Interaction approach comparing 3 different models: 2 simplified models of the pump and a full pump model.