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Publications from the year 2010
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A thermodynamic criterion for selection of working fluid for subcritical and supercritical domestic micro CHP
- Dariusz Mikielewicz
- Jarosław Mikielewicz
W pracy przedstawiono kryterium termodynamiczne doboru czynnika roboczego dla mikrosiłowni pracującej w warunkach podkrytycznych i nadkrytycznych. Przeanalizowano 20 płynów możliwych do wykorzystania w mikrosiłowni ORC. Z analizy wynika, że najlepszym płynem roboczym jest etanol, R123 oraz R141b.
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A universal IT system architecture for servicing, collecting, storing, processing and presenting data from wireless devices
- Michał Roszman
- Krzysztof Nyka
- Łukasz Kulas
In the article we present a universal IT system architecture, which allows one to develop, based on mobile and multiplatform JAVA language, applications capable of working with many different wireless systems in an easy and effective way. Modular system architecture supports efficient data processing and enables convenient presentation of chosen parameters. Additionally, proposed IT system architecture provides easy adoption to new wireless systems in a very simple manner, which was tested for three different wireless systems.
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Aaliza zjawisk dynamicznych w komorze cylindrowej pompy pwk o zmiennej wydajności
- Piotr Patrosz
- Leszek Osiecki
opisano budowę i zasadę działania mechanizmu zmiany wydajności pompy wielotłoczkowej osiowej pwkz sterowanej krzywkowo. wyjaśniono przyczyny powstawania zjawisk dynamicznych w komorach roboczych towarzyszących przejściu komory z fazy tłoczenia w fazę ssania. dla opisania tych zjawisk przeprowadzono teoretyczną analizę zmian ciśnienia występujących w pojedynczej komorze roboczej pompy, powstających w wyniku dodatniego przekrycia kanałów rozrządu, przecieków i ściśliwości cieczy. zjawiska te nasilają się wraz ze zmniejszaniem wydajności pompy.
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AAM toolkit: a system for visual object appearance modeling
- Maciej Smiatacz
- Damian Sikora
Aktywne modele wyglądu (AAM) mogą być traktowane jako zaawansowana metoda analizy informacji multimedialnych, pozwalająca na lokalizowanie i rozpoznawanie obiektów w obrazach statycznych i sekwencjach wideo. Pomimo tego że ukazało się wiele publikacji dotyczących AAM, przejście od koncepcji teoretycznych do działającej implementacji stanowi nadal duże wyzwanie. W pracy przedstawiono przygotowany przez autorów pakiet oprogramowania pozwalający na stworzenie modelu dowolnego obiektu wizualnego. Podkreślono związki pomiędzy kwestiami algorytmicznymi a architekturą systemu. Zaprezentowano wyniki wstępnych eksperymentów przeprowadzonych przy użyciu oprogramowania AAM Toolkit.
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Abandoned places I-V, akryl 100x70
- Jacek Krenz
Międzynarodowa wystawa zbiorowa malarstwa, fotografii i tkaniny, zorganizowana pod egidą Ambasad: Brazylii, Bułgarii, Łotwy, Mozambiku, Meksyku, Panamy, Polski i Południowej Afryki.
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Ac and dc conductivities in v2o5-p2o5 glasses containing alkaline ions
- Ryszard Jan Barczyński
- Paulina Król
- Leon Murawski
We investigated the ac and dc conductivity in 50V2O5-(50 − x)P2O5-xA2O (A = Li, Na, K) glasses as a function of temperature. The measurements were carried out in the frequency range from 10−4 to 107 Hz. For all compositions, the dc conductivity decreased with the increasing alkali ion content. The decrease in conductivity was more pronounced for larger alkali ions. The ac conductivity exhibited a universal dynamic response: σac = Aωs(T). For glasses containing less than 10 mol% of alkaline ions, the exponent s(T) temperature dependence was typical as that for electronic conducting glasses and decreased from a value near to unity at a low temperature (153 K) to 0.5 at 423 K. A small variation only (from 0.99 to 0.95) of s(T) was observed in the mixed electronic-ionic regime. This behavior is known as nearly constant loss (NCL). We found that the NCL behavior could be observed in a very wide range of temperature and frequency in mixed electronic-ionic conducting glasses.
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Accuracy analysis of a mobile station location in the cellular networks
- Jacek Stefański
Jakość usług lokalizacyjnych oferowanych w sieciach komórkowych zależy od efektywności estymacji położenia terminala ruchomego. Dokładność obecnie stosowanych metod lokalizacyjnych jest niewystarczająca, szczególnie w odniesieniu do wywołań w niebezpieczeństwie. Modyfikacja istniejących algorytmów może istotnie wpłynąć na zwiększenie dokładności lokalizowania terminala ruchomego przy jednocześnie niewielkich nakładach finansowych. Jednym z istotnych parametrów wpływających na dokładność estymacji położenia terminala ruchomego jest rzeczywista wartość odległości pomiędzy terminalem ruchomym a stacją bazową. Poprawa dokładności tego parametru znacząco wpływa na jakość oferowanych w sieci komórkowej usług lokalizacyjnych, szczególnie w środowisku propagacji wielodrogowej. Zjawisko propagacji wielodrogowej zostało wykorzystane do poprawy dokładności estymacji odległości pomiędzy terminalem ruchomym a stacja bazową. W rezultacie opracowano nowy model propagacyjny do estymacji odległości pomiędzy terminalem ruchomym a stacją bazową dla potrzeb implementacyjnych metody Cell ID + RSS w systemie UMTS w środowisku miejskim.
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Acidity trace pollutants of urban rain and roof runoff from selected roof coverings
- Żaneta Polkowska
W pracy przedstawiono dane dotyczące chemizmu opadów atmosferycznych i wód spływnych pobranych na terenie dużej aglomeracji miejskiej. Oznaczane były: pH, aniony - chlorki, azotany i siarczany oraz metale ciężkie - cynk, ołów, miedź, kadm. Próbki były pobierane na terenie Trójmiasta i w Dąbrówce Tczewskiej koło Gdańska z budynków pokrytych nowymi i starymi pokryciami. Badania prowadzono od kwietnia do czerwca 2006.
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Acoustic radar employing particle velocity sensors
- Józef Kotus
- Andrzej Czyżewski
A concept, practical realization and applications of a passive acoustic radar to automatic localization, tracking of sound sources were presented in the paper. The device consist of the new kind of multichannel miniature sound intensity sensors and a group of digital signal processing algorithms. Contrary to active radars, it does not emit the scanning beam but after receiving surroundings sounds it provide information about the directions of incoming acoustical signals. Practical examinations of the sensitivity and accuracy of the developed radar were also presented and discussed. The sensitivity of the realized acoustic radar was examined in free sound field. Several kinds of sound signals were used, such as: pure tone from 125 to 16000 Hz, one third octave band noise in the same frequency range and impulsive sounds. The obtained results for every kind of signal groups were presented and discussed. As results from experiments, in some cases even the small value of the signal to noise ratio was sufficient to localize sound source correctly. A video camera can be pointed automatically to the place the detected acoustical source is localized. Hence, the information about the sound event direction can be used to automatic and remote control of the PTZ (Pan Tilt Zoom) cameras. The automatic and continuous tracking in real time of the selected sound source movement is also possible. The proposed solution can significantly improve the functionality of the traditional surveillance monitoring systems.
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Acoustical Standards Used in Design of School Spaces = Standardy akustyczne używane w projektowaniu przestrzeni szkoły
- Dominika Wróblewska
Artykuł prezentuje wytyczne projektowania akustyki wnętrz w pomieszczeniach szkolnych zawarte w europejskich i amerykańskich standardach technicznych. Opisane są także aktualne polskie przepisy odnoszące się do akustyki wnętrza. We wnioskach zaprezentowano wytyczne dla poprawy komfortu akustycznego w szkołach. // Design guidelines for interior acoustics in learning spaces included in European and American technical standards and other documents are presented. The current Polish regulations referring to interior acoustics are described. The proposal of a set of acoustical guidelines for improving acoustical comfort in school spaces is given.
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Acoustics of concert hall at academy of music in Gdańsk, project and realization
- Andrzej Kulowski
Artykuł opisuje właściwości akustyczne sali koncertowej Akademii Muzycznej w Gdańsku, ukończonej w roku 2007. Przedstawiono zalecenia akustyczne do projektu architektonicznego w zakresie akustyki budowlanej i akustyki wnętrz. Podano wyniki pomiarów akustycznych na kolejnych etapach realizacji obiektu.
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Adaptacyjny algorytm regulacji transformatorów zasilających sieć rozdzielczą
- Robert Małkowski
- Zbigniew Szczerba
W niniejszym artykule opisano przykład nowego inteligentnego regulatora transformatora. Układ regulacji transformatorów 110/SN, z proponowanym algorytmem działania, umożliwia automatyczne dostosowanie algorytmu działania regulatorów do aktualnych stanów systemu elektroenergetycznego (np. lawina napięcia) i w ten sposób może wpłynąć na wzrost bezpieczeństwa elektroenergetycznego.
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Adaptacyjny regulator transformatora blokowego = Adaptive controller of generator transformer
- Artur Zbroński
W referacie przedstawiono koncepcję adaptacyjnego regulatora transformatora blokowego jako narzędzia do rozszerzenia ograniczeń generacji mocy biernej generatora synchronicznego.
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Adhesive Monitoring with Instrumented Wedge Test
- Michał Budzik
- Krystyna Imielińska
- Julien Jumel
- Martin Shanahan
The wedge test (sometimes called the Boeing wedge test) is amongst the most readily exploitable techniques for assessment of the rate-dependent fracture energy of adhesive materials when used to bond relatively rigid substrates. With its siblings: the double cantilever beam (DCB), and the tapered double cantilever beam (TDCB), a force is applied, essentially in cleavage, to provoke substrate separation perpendicularly to the bondline e.g. E.J. Ripling, S. Mostovoy (1966) or B. Blackman et all (1991). Wedge tests are usually analysed assuming that the free, unbonded members may be treated as encastré cantilever beams. However, if the adhesive layer is sufficiently flexible (e.g. due to low elastic modulus), then significant strain in the bonded region may occur and lead to modification of the behaviour outside this region. Using in conjunction a sensitive strain gauge method on asymmetric wedge tests and a mathematical analysis developed from the work of Winkler, we conclude that the standard, simple beam theory approach significantly overestimates crack length for a supple adhesive layer. The present contribution mainly considers strain effects in the intact, bonded zone, rather than fracture per se.
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Advanced Macromodel Matrix Structure Cloning for FDTD
- Jakub Podwalski
- Łukasz Kulas
- Michał Mrozowski
We propose an improved macromodel-based techniquefor efficient analysis of the structures based on PhotonicCrystals (PhC). The technique involves a new structure of thecoupling matrix and advanced cloning of not only the macromodel􀀀 matrices, but also the coupling matrices SE and SH.The method allows one to shorten considerably the preprocessingtime, the RAM usage and also the iterating speed of performingFDTD. With this scheme, it is possible to simulate efficiently upto several thousands of macromodels.
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Advanced surveillance and operational communication system employing mobile terminals
- Andrzej Ciarkowski
- Andrzej Czyżewski
Distributed surveillance and operational communications system based on XMPP protocol is presented. Its architecture and assumptions leading to the depicted design are shown. Features of XMPP protocol are portrayed with the emphasis on those most important in the context of the application. Real-time multimedia transmission with the use of Jingle/XMPP extension is discussed. The use of PDA-class computers as mobile terminals is introduced. Technical aspects of multimedia communications session establishment in the presence of Network Address Translation devices and firewalls are presented.
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Advances in macromodeling technique
- Jakub Podwalski
- Michał Mrozowski
The paper discuses recent advances in the finite differencetime domain method employing macromodels. New techniquesfor creating irregularly shaped macromodels, grouping ofmacromodels and advanced macromodel cloning are introduced.The last technique is particularly important for efficient analysisof the structures based on Photonic Crystals (PhC). The methodallows one to shorten considerably the preprocessing time, theRAM usage and also, in same cases, the iterating speed of theFDTD algorithm. With the new macromodel cloning schemeit is possible to simulate efficiently up to many thousands ofmacromodels.
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Agent System for Managing Distributed Mobile Interactive Documents
- Magdalena Godlewska
The MIND architecture of distributed mobile interactive document is a new processing model defined for facilitate informed decision-making in non-algorithmic decision-making processes carried out by knowledge-based organizations. The aim of this architecture is to change the static document to mobile agents, which are designed to implement the structure of the organization through autonomous migration between knowledge workers in accordance with the built-in policy. An extensible functionality of the agents also extends the static document to interface unit. The prototype of the agent system, based on the MIND architecture, shows the possibility of its implementation using available technology. The case studies provide the possibility of using architecture to solve specific decision problems with external knowledge of organization's workers.
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Agent-based social network as a simulation of a market behaviour
- Małgorzata Płotka
- W. St. Mościbrodzki
Recent years and the outbreak of world's economic crisis in 2008 proved the crucial importance of reliable analysis of market dynamics. However, werarely apply models of proper detail level (the global prosperity forecast of 2007 can be seen as a grim proof). The behaviour of individuals and companies is far from being ideal and rational. Many claims that the economic paradigm of rational expectations (coming from J. Muth and R. Lucas) should be extended by theory of irrationality. Moreover, the knowledge of market is usually limited, as the price of intelligence is high. Therefore, typical model of supply-demand is applicable in rare cases only. On the other hand, complicated theoretical economic models usually lack support from flexible simulation tools. That way usable simulation playgrounds for testing user- based scenarios are rare. In this article authors propose a dynamic relationship network designed for a computer simulation of market behaviour. The core assumption is, that decisions of market subjects are not based by objective knowledge, but rather on associative memory (information gathered by subject and by trustworthy partners). The obvious example: one would rather buy from a supplier recommended by a friend, than try to check pricing (and quality) in all available sources. Moreover: all actions between partners (including information exchange) influence the power of mutual relation (this is similar to Flood & Dresher Prisoner's Dilemma model and the outcomes of Axelrode Tournament).The proposed platform is based on a newly designed and implemented (in C++) library. It consists of three main layers: autonomic agents (including both abstract models of behaviour and scripts), network management routines (rules for creating and maintaining the relationships between agent) and measurement interface. This model is flexible enough to implement variety of agent-network configuration, but special attention is placed on purely economical scenarios.In the classical supply-demand model, the market price is fixed at the level set by rational decisions of all involved parties. However, in real life subjects (especially individual customers) operate in limited knowledge (no access to all sources or the access is expensive). The lack of full information is balanced by an associative memory stored in relation network. This network can be utilised in price establishment. However, the result is not fixed, but rather fuzzy (the transaction price can differ on one market). In this article, authors present the model of a relationship-drivenmarket and its working implementation. There is also a discussion ofoutcomes - i.e. the impact of network parameters on actual price evaluation. Platform proposed in the paper should be seen a result of synergy of knowledge combined from three areas of science. The IT model and implementation details comes from computer science and mathematics (graph theory). The market behaviour models and simulation's output definition are taken from economics. Finally, the agent scripts are based on observations from psychology (i.e. theory of relationships and decision making ).