Publications Repository - Gdańsk University of Technology

Page settings

polski
Publications Repository
Gdańsk University of Technology

Show publications from the year

Publications from the year 2014

Show all
  • Dissolved and colloidal organic nitrogen removal from WWTP effluents and reject waters using physical-chemical processes
    • Krzysztof Czerwionka
    • Jacek Mąkinia
    2014 Full text WATER SCIENCE AND TECHNOLOGY

    Four physical-chemical processes were compared in terms of the efficiencies of dissolved and colloidal organic nitrogen (DON and CON) removal from the secondary effluents (SE) and reject water from full-scale biological nutrient removal activated sludge systems. Adsorption on activated carbon was most efficient and allowed to remove from the SE up to 80% and 100% of DON and CON, respectively. High efficiencies of DON removal from SE (up to 55%) were also obtained when using coagulation with Fe(III) chloride and calcium hydroxide at the final pH=11.0-11.5. The efficiency of DON removal from thickening waste activated sludge (TWAS) reject water, obtained using coagulation with Fe(III) chloride, was comparable with the efficiency for the SE. The efficiency of this process with regard to the sludge digester liquors (SDL) was significantly higher, i.e. 65-70% for both DON and CON. Ion exchange process with strongly acidic cation exchange resin (without pH correction) resulted in a relatively small efficiency of DON removal (<15%), and negligible efficiency of CON removal (<10%). Furthermore, ultrafiltration (0.015 μm) of SE and TWAS resulted in a relatively low efficiency of DON removal (10-13% and 10-20% respectively). Ultrafiltration was found to be more effective for DON removal from SDL (41-68%).

  • Distillery Fusel Oil as an Alternative Carbon Source for Denitrification – from Laboratory Experiments to Full-Scale Applications
    • Jacek Mąkinia
    • Krzysztof Czerwionka
    • Magdalena Kaszubowska
    • Joanna Majtacz
    2014 WATER SCIENCE AND TECHNOLOGY

    Industrial waste products may be a viable alternative to commercial external carbon sources. In this study, the properties of fusel oil (distillery waste product) were investigated in terms of temperature dependency of denitrification and acclimation period. Furthermore, results obtained during three different full-scale trials were used to verify similarities and differences with the results obtained under laboratory-scale conditions. Batch experiments with non-acclimated biomass revealed a very strong temperature dependency of the denitrification process (q = 1.15, R2 = 0.92) in the range of examined process temperatures (13-22 oC). Fusel oil had minor (or no) effects on the behaviour of NO2-N and PO4-P. Significantly lower nitrate utilization rates (NURs) were observed during acclimation to fusel oil in the full-scale bioreactors compared to a bench-scale reactor. This may primarily be attributed to lower doses of fusel oil, lower process temperatures and more complicated process configurations (resulted in not optimal use of fusel oil for denitrification). Results obtained from both laboratory-scale experiments and full-scale trials suggested that an acclimation period of a few weeks would be required to reach the maximum denitrification capability of process biomass, even though positive effects of dosing can be observed almost immediately

  • Distortion of speech signals in the listening area: its mechanism and measurements
    • Henryk Lasota
    • R. Mazurek
    • Iwona Kochańska
    2014

    The paper deals with a problem of the influence of the number and distribution of loudspeakers in speech reinforcement systems on the quality of publicly addressed voice messages, namely on speech intelligibility in the listening area. Linear superposition of time-shifted broadband waves of a same form and slightly different magnitudes that reach a listener from numerous coherent sources, is accompanied by interference effects leading to a deep modification of the received signal waveform and, consequently, of its frequency spectrum. The mechanism of formation of the acoustic field is described both in the special case of a linear array of sources, which in areas respectively distant from the aperture allows to determine either a regular transfer function in a given direction, or a directional characteristics at a given frequency, and in the general case of randomly distributed radiating elements. The results of simulations and measurements illustrate the impact of the multiplication of sound sources on the parameters of formants important for speech intelligibility. The measurements performed by the authors in auditory rooms, and the analysis of results point to a significant need to adopt standardized measures related to the effect of broadband interference, particularly of its degrading influence on the listeners’ ability to discriminate and recognize speech elements. Such a measures should complete existing standards, being at present related mainly to room reverberation effects.

  • Distributed state estimation using a network of asynchronous processing nodes
    • Zdzisław Kowalczuk
    • Mariusz Domżalski
    2014 Advances in Intelligent Systems and Computing

    We consider the problem of distributed state estimation of continuous-time stochastic processes using a~network of processing nodes. Each node performs measurement and estimation using the Kalman filtering technique, communicates its results to other nodes in the network, and utilizes similar results from the other nodes in its own computations. We assume that the connection graph of the network is not complete, i.e. not all nodes are directly connected, and that the nodes work asynchronously, i.e. they perform measurement and estimation in time moments independent of each other. We evaluate the impact of the way of propagation of information from most precise nodes over the network on the overall performance of distributed estimation.

  • Distributed state estimation using a network of asynchronous processing nodes
    • Zdzisław Kowalczuk
    • Mariusz Domżalski
    2014

    We consider the problem of distributed state estimation of continuous-time stochastic processes using a~network of processing nodes. Each node performs measurement and estimation using the Kalman filtering technique, communicates its results to other nodes in the network, and utilizes similar results from the other nodes in its own computations. We assume that the connection graph of the network is not complete, i.e. not all nodes are directly connected, and that the nodes work asynchronously, i.e. they perform measurement and estimation in time moments independent of each other. We evaluate the impact of the way of propagation of information from most precise nodes over the network on the overall performance of distributed estimation.

  • Distributed wireless sensor for measuring humidity and temperature
    • Katarzyna Karpienko
    • Daria Majchrowicz
    • Maciej Wróbel
    2014 Elektronika : konstrukcje, technologie, zastosowania

    Humidity and temperature monitoring is often required in industrial halls and laboratories and can be crucial, because many properties of electrical devices deteriorates under influence of these parameters. There are several useful commercial methods for measuring humidity and temperature, such as commercial hygrometers and humidity recorders. However, they do not allow data acquisition simultaneously from multiple sensors. This paper presents developed distributed wireless humidity and temperature measurement sensor, which consist of four building blocks: transducer module, transmitter module, receiver module and PC. Developed sensor is easy to operate, cheap to produce, and simple to build. Correct operation of constructed device was verified using a commercial ETI 6100 hygrometer.

  • Distribution of the displacement sequence of an orientation preserving circle homeomorphism
    • Wacław Marzantowicz
    • Justyna Signerska-Rynkowska
    2014 DYNAMICAL SYSTEMS-AN INTERNATIONAL JOURNAL

    In some applications not only the knowledge of the behaviour of trajectories of a map is important, but also their displacements. We describe in detail the distribution of elements of the displacement sequence along a trajectory of an orientation preserving circle homeomorphism ϕ with irrational rotation number ϱ(ϕ). The values of displacement are dense in a set which depends on the map γ (semi-)conjugating ϕ with the rotation by ϱ(ϕ) and which is the support of the displacement distribution. We provide an effective formula for the density of this distribution if γ is a C1-diffeomorphism. Moreover, we show approximation of the displacement distribution by sample displacements measured for any other circle homeomorphism sufficiently close to the initial homeomorphism ϕ, which constitutes a rigorous proof of numerical results seen in certain integrate-and-fire models.

  • Dlaczego subwencje nie są rozwojowe? Próba identyfikacji przyczyn braku wpływu subwencji na wydatki inwestycyjne
    • Alicja Sekuła
    • Beata Basińska
    2014 Full text PRACE NAUKOWE UNIWERSYTETU EKONOMICZNEGO WE WROCŁAWIU

    Artykuł skupia się na poszukiwaniu przyczyn braku wpływu subwencji ogólnej na wydatki inwestycyjne jednostek samorządu terytorialnego. Na podstawie wyników badań statystycznych oraz porównania wpływów z części oświatowej subwencji ogólnej oraz jej całkowitej wielkości w stosunku do wydatków oświatowych jako najbardziej prawdopodobne wytłumaczenie przyjęto wysokość tych ostatnich, które nierzadko przekraczają wpływy z całej subwencji ogólnej.

  • DO WE NEED NAVIER NUMBER? – FURTHER REMARKS AND COMPARISON WITH ANOTHER DIMENSIONLESS NUMBERS
    • Paweł Ziółkowski
    • Janusz Badur
    • Piotr Ziółkowski
    2014

    This paper presents a role of the Navier number (Na-dimensionless slip-length) in universal modelling of flow reported in micro- and nano-channels like: capillary biological flows, fuel cell systems, micro-electro-mechanical systems and nano-electro-mechanical systems. Similar to another bulk-like and surface-like dimensionless numbers, the Na number should be treated as a ratio of internal viscous to external viscous momentum transport and therefore this notion cannot be extended onto whole friction resistance phenomena. Several examples of dimensionless number for liquids and rarified gasses flowing in solid cannels are presented. Additionally this article explains a role of the Navier number in prediction of closures for laminar to turbulent transition undergoing via eddies detachment from the slip layer in nano-channels.

  • Dobór odpowiednich kabli do układów z przemiennikami częstotliwości
    • Marek Olesz
    2014 Inżynieria & Utrzymanie Ruchu

    W artykule opisano zasady doboru okablowania do silników zasilanych z przemienników częstotliwości. W komentarzu podano budowę i cechy konstrukcyjne kabli do układów w przemiennikami częstotliwości.

  • DOBÓR OPTYMALNEGO CZYNNIKA DO PRACY Z HYBRYDOWYM MINIKANAŁOWOMIKROSTRUGOWYM MODUŁEM CHŁODZĄCYM
    • Rafał Andrzejczyk
    • Tomasz Muszyński
    2014 Dokonania Młodych Naukowców

    Obecnie widoczne są silne dążenia w kierunku wykorzystania technologii mini i mikro kanałowych oraz nowoczesnych materiałów konstrukcyjnych w celu zwiększenia efektywności energetycznej, intensywności wymiany ciepła i masy. Niestety dostrzegalnym korzyściom wynikającym z zastosowania wspomnianych technologii, takich jak wzrost wartości współczynników przejmowania ciepła, towarzyszą również aspekty negatywne np. wzrost oporów przepływu. Dlatego też pojawiło się kolejne wyzwanie związane z optymalizacją urządzeń wykorzystujących technologie mini i mikrokanałowe.

  • Dobór wyrobów geosyntetycznych do zbrojenia gruntu
    • Angelika Duszyńska
    • Zbigniew Sikora
    2014 Full text Inżynieria Morska i Geotechnika

    Grunt zbrojony geosyntetykami: strome skarpy i konstrukcje oporowe, nasypy na słabym podłożu, nasypy na palach z geosyntetycznym zbrojeniem nadpalowym. Geotekstylia i wyroby pokrewne stosowane do wzmacniania budowli ziemnych. Projektowanie zbrojenia geosyntetycznego zgodnie z normą brytyjską BS 8006:2010 i niemieckimi wytycznymi EBGEO 2010.

  • Docieranie powierzchni płaskich w operacjach montażowych
    • Adam Barylski
    2014 Technologia i Automatyzacja Montażu

    W artykule przedstawiono wyniki analiz docierania elementów ceramicznych na docierarce jednotarczowej. Prezentowane dane mogą być wykorzystane w opracowywaniu technologii docierania stosowanych podczas montażu zespołów. Szczególnie przydatne będą one przy indywidualnym dopasowaniu elementów lub przy zastosowaniu kompensacji technologicznej.

  • Docking simulations, Molecular properties and ADMET studies of novel Chromane­6,7­diol analogues as potential inhibitors of Mushroom tyrosinase
    • Monikaben Padariya
    • Umesh Kalathiya
    • Maciej Bagiński
    2014 Gene Therapy and Molecular Biology

    Research on inhibition of tyrosinase enzyme has attained significant value, because tyrosinase inhibitors have potential applications in medicine, cosmetics (as whitening agents) and in agriculture (as bio­insecticides). Determination and elucidation of new tyrosinase inhibitors are not only beneficial for medical purposes, but their promising applications in improving food quality and nutritional value, controlling insect pests are also crucial. So, it is all time requirement to design novel and more potential inhibitors of tyrosinase enzyme. In this study, considering potent inhibitory activity of polyphenolic compounds against tyrosinase enzyme, a series of Chromane­6,7­diol analogues were designed. All of these designed compounds were subjected to ADME (absorption, distribution, metabolism, and elimination) and extensible toxicity prediction protocol of Accelrys Discovery studio 3.1 client package to predict their molecular properties which are important to be a drug candidate. Subsequently, molecular docking simulations of tyrosinase enzyme with novel designed inhibitors has been the focus of our work. Three distinct algorithms (CDOCKER, LibDock, and AutoDock) are utilized to investigate the binding affinities and conformations of newly designed inhibitors. Most of the compounds fulfilled criterias for ADME and toxicity profile and obtained potential inhibition towards mushroom tyrosinase enzyme. Results obtained through this study suggest that, chromane derivatives with more hydroxyl substitutions produced stronger inhibition by forming extra hydrogen bonds than those with less hydroxyl groups. To be more specific about drug candidate, UM25 obtained as the most potent inhibitor in terms of pharmacokinetic, pharmacodynamics, physicochemical, and docking properties

  • Does technology matter for economic development? Empirical evidence for Latin American Countries
    • Ewa Lechman
    2014

    The spread of new Information and Communication Technologies (ICTs) has been recognized worldwide. ICTs are broadly perceived as tools facilitating economic growth and development, especially in backward countries. They are easy and cheap to adopt, require minimum skills for effective use, and bring opportunities for disadvantaged societies. They enable education, knowledge dissemination and sharing, and processing and storing of all kinds of information. The existence of causal relationships between technology diffusion and general economy performance is highly probable. This chapter seeks empirical evidence in existing quantitative links between the process of Information and Communication Technologies (ICTs) adoption and dynamics of economic growth and development in Latin American countries. The authors consider ICTs diffusion patterns in Latin American countries, approximating the diffusion process by S-shaped curves. Afterwards, they aim to detect if there is any quantitative relationship between ICTs adoption dynamics and economic growth and development, and they estimate to what extend ICTs contribute to economic growth and development. The authors hypothesize on existing statistically significant and strong links between the two. They use panel data for Latin American economies from the years 1990-2011. All necessary data are derived from World Telecommunication/ICT Indicators Database 2012 (16th edition) and World Development Indicators 2012.

  • Dokładność określania pozycji odbiornika w systemie radionawigacyjnym z niepewną pozycją nadajników
    • Jarosław Sadowski
    2014 Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

    Referat zawiera analizę pracy algorytmu określania pozycji stacji bazowych w systemie radionawigacyjnym na podstawie serii pomiarów TDOA obarczonych błędami oraz wpływu błędów oszacowania pozycji stacji bazowych na późniejszą dokładność określania pozycji odbiornika na bazie pomiarów zależności czasowych sygnałów z tych stacji. Analiza jest oparta na wynikach pomiarów w eksperymentalnym morskim systemie nawigacyjnym AEGIR.

  • Dokładność skal ekwiwalentności a indyferencja stochastyczna
    • Stanisław Kot
    2014 Full text Metody Ilościowe w Badaniach Ekonomicznych

    W pracy dowodzimy twierdzenia, które wiąże założenie dokładności skal ekwiwalentności (ESE) z symetrycznym czynnikiem dominacji stochastycznej pierwszego rzędu. Dokładniej, niech X i Y będą rozkładami wydatków, odpowiednio, analizowanej grupy gospodarstw domowych i grupy gospodarstw odniesienia. Niech Z oznacza rozkład X skorygowany za pomocą pewnej skali ekwiwalentności. Jeśli spełnione jest założenie ESE, to Z jest stochastyczne indyferentne z X. /Jednakże indyferencja stochastyczna (SI) nie implikuje ESE. Oznacza to, że SI jest założeniem słabszym niż ESE. Proponujemy obliczać skale ekwiwalentności na podstawie kryterium SI, gdy ESE nie jest spełnione.

  • Dome over the Gdynia seaport building
    • Tadeusz Godycki-Ćwirko
    • Krystyna Nagrodzka-Godycka
    • Paweł Piotrkowski
    2014 Full text Archives of Civil Engineering

    The paper presents the description of structure and the selected problems of the technical condition, as well as the strength analysis of the thin-walled reinforced concrete shell which has been making a covering of the main hall of the Gdynia Seaport Building through the last 80 years. The rectangle projection of four single curvature shells of the dome was shaped out of mutual perpendicular intersection of two cylindrical shells. The analysis of the state of stress and deformations was carried out using the special model worked out in MES considering the combination of loads, the thermal ones included. For the long lasting loads (the deadweight of the dome), the computed results of static quantities were confronted with analytical results obtained according to F. Dischinger’s method. This method had been applied by the DYWIDAG Company in Berlin and its branch in Katowice (Poland) who designed the Gdynia Dome. The computational analysis and the assessment of the technical state, along with laboratory pH tests of concrete, made it possible to carry out the overall evaluation of durability and safety of operation of the Gdynia Seaport Dome through the next decades.

  • Domestic ORC micro-CHP combined with a commercial gas boiler
    • Dariusz Mikielewicz
    • Jan Wajs
    • Jarosław Mikielewicz
    • Michał Bajor
    2014

    The chapter presents the results of experimental studies conducted during the launch of the first in Poland demonstration prototype of the micro ORC coupled to a domestic gas boiler. The accomplished studies indicated the possibility for the ORC module to work with such boiler (autonomous source of heat) with a prototype single-stage axial micro turbine as the expansion machine. Confirmation of that fact has been delineated in the recorded temperature and pressure in characteristic points of the steam cycle, as well as the rates of heat, turbine power and the power of generated electricity. The prototype of the micro CHP is innovative due to the compactness of the system, mobility and dedicated solutions of heat exchangers such as evaporator and condenser. Domestic gas boiler, fitted with a steam turbine with ethanol as the working fluid, can be called the third generation boiler, where electricity is produced as a byproduct sufficient to cover the needs of the individual household.

  • Doskonalenie strumienia wartości
    • Joanna Czerska
    2014

    Książka ta ma na celu praktyczne ujęcie problemu optymalizacji przedsiębiorstwa opartej na koncepcji Lean (z ang. Lean – szczupły) i jej narzędziu Mapowania Strumienia Wartości. Prezentowane podejście do Mapowania Strumienia Wartości jest spójne z innymi pozycjami literaturowymi w tym zakresie. Jednak moje dziesięcioletnie doświadczenie zdobywane w toku kilkudziesięciu projektów wskazało mi dodatkowe kierunki analiz, które warto przeprowadzić już na etapie diagnozowania stanu istniejącego przedsiębiorstwa. To co prezentuję w niniejszej książce, to coś co nazywam „rozszerzonym mapowaniem”. Uważam bowiem, że rozproszona analiza na etapie diagnozowania stanu istniejącego pozwala lepiej zidentyfikować potencjał do doskonalenia oraz postawić cele, które są SMART. Szczególną uwagę w mapowaniu poświęcam kwestii logistyki, która wg przeprowadzonych badań, gwarantuje największy potencjał do doskonalenia płynności finansowej przedsiębiorstwa oraz efektywności procesu wytwórczego. Kolejną kwestią, która ma ogromne znaczenie dla poprawy efektywności funkcjonowania całego przedsiębiorstwa jest analiza wskaźników działów oraz relacji międzywydziałowych. Wnioski pozwalają zintegrować zespół managerów i skoncentrować ich działania ma spójnych celach i jedynym, najlepszym dla przedsiębiorstwa, kierunku działania. Pomysł na napisanie książki powstał w trakcie mojej pracy z kilkuset fabrykami na przestrzeni lat 2002-2009, w których starałam się wyjaśnić, w jaki sposób patrzeć na firmę, diagnozować możliwości rozwoju i jak planować zmiany, by doprowadziły do wzrostu zyskowności przedsiębiorstwa.