2013 - Repozytorium publikacji - Politechnika Gdańska

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Publikacje z roku 2013

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Parallel frequency tracking with built-in performance evaluation
- Michał Meller
- Maciej Niedźwiecki
2013 DIGITAL SIGNAL PROCESSING
The problem of estimation of instantaneous frequency of a nonstationary complex sinusoid (cisoid) buried in wideband noise is considered. The proposed approach employs a bank of adaptive notch filters, extended with a nontrivial performance assessment mechanism which automatically chooses the best performing filter in the bank. Additionally, a computationally attractive method of implementing the bank is proposed. The new structure allows one to improve tracking results considerably, especially in nonstationary conditions. In terms of accuracy of frequency estimates, the proposed scheme outperforms existing ones considerably.
Parameter and delay estimation of linear continuous-time systems
- Janusz Kozłowski
- Zdzisław Kowalczuk
2013
In this paper the problem of on-line identification of non-stationary delay systems is considered. Dynamics of supervised industrial processes is described by ordinary differential equations. Discrete-time mechanization of their continuous-time representations is based on dedicated finite-horizon integrating filters. Least-squares and instrumental variable procedures implemented in recursive forms are applied for simultaneous identification of input delay and spectral parameters of the system models. The performance of the proposed estimation algorithms is verified in a numerical simulation study.
Parameter selection of an adaptive PI state observer for an induction motor
- Tadeusz Białoń
- Arkadiusz Lewicki
- Marian Pasko
- Roman Niestrój
2013 Pełny tekst Bulletin of the Polish Academy of Sciences-Technical Sciences
The paper discusses problems connected with the parameters selection of the proportional-integral observer, designed for recon- struction of magnetic ﬂuxes and angular speed of an induction motor. The selection is performed in several stages that are focused on diﬀerent criteria. The ﬁrst stage consists in selecting observer’s gains and provides desired dynamical properties, taking into consideration immunity to disturbances and parameter variations of observed system. The second stage prevents an observer from DC-oﬀset cumulation and instability. The last stage consists in setting the parameters of a speed adaptation mechanism. The impact of diﬀerent settings on the properties of an observer is illustrated with experimental results, obtained in the multiscalar control system of an induction motor.
Parametrization and Correlation Analysis Applied to Music Mood Classification .
- Bożena Kostek
- Magdalena Piotrowska
2013 International Journal of Computational Intelligence Studies
The paper presents a study on music mood categorization. First, a review of music mood models is presented. Then, the preparation of a set of music excerpts to be used in the experiments and music parametrization is described. Next, some listening tasks performed to obtain mood descriptors are introduced. Finally,the correlation between mood descriptors and features extracted from parameters is discussed. The paper concludes with some observations derived from the analysis performed.
Parametryczny model jako zapis przestrzeni architektonicznej
- Maria Helenowska-Peschke
2013 Czasopismo Techniczne
Współcześnie coraz więcej pola w domenie architektury zagarniają technologie informatyczne, które umożliwiły między innymi wypracowanie nowych metod zapisu przestrzeni architektonicznej. Mowa tu o technikach wykorzystujących modelowanie parametryczne i programowanie do poszukiwania rozwiązań formalnych wyrażających i uwzględniających czynniki i procesy kontekstowe. Celem opracowania jest wskazanie korzyści , ograniczeń i perspektyw związanych z ich wykorzystaniem w procesie poszukiwania i racjonalizacji rozwiązań skomplikowanych i złożonych zadań projektowych.
Parki technologiczne jako pomost pomiędzy nauką a biznesem na przykładzie Pomorskiego Parku Naukowo-Technologicznego
- Anna Lis
2013
Głównym celem niniejszego rozdziału jest przedstawienie idei funkcjonowania parków technologicznych w gospodarce, a w szczególności omówienie roli parków w budowaniu sieci współpracy między światem nauki a biznesu. Parki technologiczne w dużym stopniu umożliwiają zbliżenie nauki do biznesu, a tym samym poprawę warunków dla innowacyjnej przedsiębiorczości i transferu technologii. Autorki na przykładzie Pomorskiego Parku Naukowo-Technologicznego w Gdyni prezentują najbardziej popularne formy interakcji między Parkiem i firmami lokatorskimi a ośrodkami akademickimi, omawiają charakter występujących powiązań oraz wskazują na efekty wzajemnej współpracy.
Parki tematyczne w rozwoju lokalnym miasteczek i wsi
- Joanna Poczobut
2013 Pełny tekst Studia Ekonomiczne. Zeszyty Naukowe Uniwersytetu Ekonomicznego w Katowicach
Obecnie niemal każde polskie miasto i wieś ma na celu znalezienie dobrego pomysłu na swój rozwój społeczno-gospodarczy. Najczęściej jest nim założenie parku tematycznego. Dobrze się dzieje, gdy takie przedsięwzięcie wspiera lokalne tradycje, zwyczaje i walory kulturowe miasta czy wsi; gdy promowane są miejscowe produkty i żywność. Niestety, nie zawsze tak jest. Niektóre miasta i gminy chętniej przyjmują zupełnie inną politykę rozwoju. Nowy projekt rozwoju jest czymś obcym w regionie - nie wspiera lokalnej tradycji. Priorytetem staje się jedynie taki pomysł, który zapewni przyjazd jak największej liczby odwiedzających, a wraz z tym - wysokie korzyści finansowe.
Partial characterization of indigo (Polygonum tinctorium Ait.) plant seeds and leaves
- Buk-Gu Heo
- Hong-Gi Jang
- Ja Yong Cho
- Jacek Namieśnik
- Zenon Jastrzębski
- Kann Verasilp
- Gustavo Gonzalez-Aquilar
- Alma Leticia Martinez-Ayala
- Milan Suhaj
- Shela Gorinstein
2013 INDUSTRIAL CROPS AND PRODUCTS
The aim of this study was to assess the contents of indigo's bioactive compounds, its antioxidant and anticancer activities in acetone, hexane and DMSO extracts and to compare the overall bioactivity with another more used medicinal plant named prolipid. It was found that the contents of the bioactive compounds in the studied extracts from different parts of indigo plant varied (P < 0.05): the significantly highest content of polyphenols and flavonoids was in DMSO extract of prolipid, flavanols - in acetone extract of brown seeds (P < 0.05 in both cases) and tannins - in DMSO extract of green leaves, but not significantly (P > 0.05). Also the level of antioxidant activity was different: the highest antioxidant activity of all studied samples was in prolipid: according to ABTS, FRAP and CUPRAC tests in DMSO extract (P < 0.05 in all 3 cases), and only in acetone extract according to DPPH was not significant (P > 0.05). The correlations between polyphenol compounds and the antioxidant activities were relatively high. DPPH kinetic measurements were used to compare and distinguish the antiradical activity among indigo extracts by multivariate analysis. The FT-IR spectroscopy evaluated the presence of polyphenols. The interaction between DMSO polyphenol extracts of indigo plant and BSA showed that indigo has a strong ability as other medicinal plants such as prolipid to quench the intrinsic fluorescence of BSA by forming complexes and was measured by 3-dimensional fluorescence (3D-FL). The highest anticancer activity was in prolipid in concentrations of 800 μg/mL against Calu-6, following by indigo brown leaves. In conclusion, organic extracts of indigo brown leaves were analyzed for their antioxidant and anticancer activities and compared with prolipid, using polyphenols composition, antioxidant activities and fluorescence properties. The indigo ability to quench the intrinsic fluorescence of BSA, relatively high content of phenolic compounds and anticancer properties can be used as medicinal plant.
Partial dominated schedules and minimizing the total completion time of deteriorating jobs
- Krzysztof Ocetkiewicz
2013 OPTIMIZATION
A problem of scheduling deteriorating jobs on a single processor is considered. The processing time of a job is given by a function pi=ai+bisi, where si is the starting time of the job, ai>=0, bi>=0, for i=1,...,n. Jobs are non-preemptive and independent and there are neither ready times nor deadlines. The goal is to minimize the total weighted completion time. We show how to employ the concept of non-dominated schedules to construct an exact algorithm for the problem. We also consider extending the algorithm to solve problems with precedence constraints and finding all Pareto-optimal solutions. Then we present how to use the concept to the problem 1|pi=a+bisi|sum Ci. We use elimination of dominated partial schedules to improve the efficiency of a branch-and-bound algorithm and present another algorithm, based solely on the elimination of dominated partial schedules.
Partial hyperbolicity and central shadowing
- Sergey Kryzhevich
- Sergey Tikhomirov
2013 Pełny tekst DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS
We study shadowing property for a partially hyperbolic diffeomor- phism f. It is proved that if f is dynamically coherent then any pseudotrajec- tory can be shadowed by a pseudotrajectory with “jumps” along the central foliation. The proof is based on the Tikhonov-Shauder fixed point theorem.
Particle Image Velocimetry Measurements of Airflow in Electrohydrodynamic Device for Dust Particle Collection
- J. Podliński
- Artur Berendt
- Jerzy Mizeraczyk
2013 International Journal of Plasma Environmental Science & Technology
In this paper the pumping effect of air in the electrohydrodynamic (EHD) device for dust particle collection is presented. To induce an airflow in this EHD device corona discharge was used. The discharge was generated between the one-sided spike electrodes and the plate electrodes. The asymmetric electric field and generated discharge resulted in a unidirectional airflow through the EHD device. The current-voltage characteristics were measured and the corona discharge power was calculated. The EHD flow and the average airflow induced in the device duct were measured using 2D PIV method. The results showed that the investigated EHD device was capable of producing significant unidirectional airflow with velocities up to 0.64 m/s.
Particle Shape Effect on Macroscopic Behaviour of Underground Structures: Numerical and Experimental Study
- Krzysztof Szarf
- Gaël Combe
- Pascal Villard
2013
The mechanical performance of underground flexible structures such as buried pipes or culverts made of plastics depend not only on the properties of the structure, but also the material surrounding it. Flexible drains can deflect by 30% with the joints staying tight, or even invert. Large deformations of the structure are difficult to model in the framework of Finite Element Method, but straightforward in Discrete Element Methods. Moreover, Discrete Element approach is able to provide information about the grain–grain and grain–structure interactions at the microscale. This paper presents numerical and experimental investigations of flexible buried pipe behaviour with focus placed on load transfer above the buried structure. Numerical modeling was able to reproduce the experimental results. Load repartition was observed affected by number of factors such as particle shape, pipe friction and pipe stiffness
Partition of friction heat between sliding semispaces due to adhesion-deformational heat generation
- Oleksii Nosko
2013 Pełny tekst INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Analytical expressions of heat-partition coefficient and contact temperatures for two sliding semispaces with account for adhesion-deformational heat generation and contact heat exchange have been obtained. The rate of deformational heat generation is assumed to decay exponentially with increase of distance from the interface. It has been shown that heat-generation configuration and the intensity of contact heat exchange have impact on heat partition only within a transient interval. The features of perfect thermal contact have been analyzed. Perfect thermal contact implies variation of heat partition in time. Heat partition and contact temperature for a semispace, sliding over a semispace with a constant temperature, have been studied. Adhesion-deformational heat generation results in a change of the direction of surface heat flow.
Partitioning of heavy metals in sub-surface flow treatment wetlands receiving high-strength wastewater
- Ewa Wojciechowska
- Magdalena Gajewska
2013 WATER SCIENCE AND TECHNOLOGY
The retention of heavy metals at two pilot-scale treatment wetlands (TWs), consisting of two vertical flow beds (VSSF) followed by a horizontal flow bed (HSSF) was studied. The TWs received highstrength wastewater: reject waters from sewage sludge centrifugation (RW) and landfill leachate (LL). The concentrations of metals: Fe, Mn, Zn, Al, Pb, Cu, Cd, Co, Ni were measured in treated wastewater, substrate of the beds and in plant material harvested from the beds (separately in above ground, ABG parts and below ground, BG parts). The TWs differed in metals retention. In the RW treating TW the metal removal efficiencies varied from 27% for Pb to over 97% for Fe and Al. In the LL treating system the concentrations of most metals decreased after VSSF-1 and VSSF-2 beds, however in the outflow from the last (HSSF) bed, the concentrations of metals (apart from Al) increased again, probably due to the anaerobic conditions at the bed. A major removal pathway was sedimentation and adsorption onto soil substrate as well as precipitation and co-precipitation. In LL treating facility the plants contained substantially higher metal concentrations in BG parts, while the upward movement of metals was restricted. In RW treating facility the BG/ABG ratios were lower, indicating that metals were transported to shoots.
Path components of the space of gradient vector fields on the two dimensional disc
- Piotr Nowak-Przygodzki
- Piotr Bartłomiejczyk
2013 Mathematica Slovaca
We present a short proof that if two gradient maps on the twodimensional disc have the same degree, then they are gradient homotopic.
Path Loss Modelling for Location Service Applications
- Sławomir Ambroziak
- Ryszard Katulski
- Jarosław Sadowski
- Jacek Stefański
2013
The aim of this paper is the path loss modeling for the radiolocation services in radiocommunication networks, particularly in cellular networks. The main results of the measurements obtained in the physical layer of the UMTS are introduced. A new method for the utilization of the multipath propagation phenomenon to improve the estimation of the distance between the mobile station (MS) and the base station (BS) is outlined. This method significantly increases the quality of location services in systems which use a radio interface with direct sequence code division multiple access (DS CDMA).
Pathological and physiological high-frequency oscillations in focal human epilepsy
- Andrew Matsumoto
- Benjamin Brinkmann
- S. Matthew Stead
- Joseph Matsumoto
- Michał Tomasz Kucewicz
- W. Richard Marsh
- Frederic Meyer
- Gregory Worrell
2013 JOURNAL OF NEUROPHYSIOLOGY
High-frequency oscillations (HFO; gamma: 40-100 Hz, ripples: 100-200 Hz, and fast ripples: 250-500 Hz) have been widely studied in health and disease. These phenomena may serve as biomarkers for epileptic brain; however, a means of differentiating between pathological and normal physiological HFO is essential. We categorized task-induced physiological HFO during periods of HFO induced by a visual or motor task by measuring frequency, duration, and spectral amplitude of each event in single trial time-frequency spectra and compared them to pathological HFO similarly measured. Pathological HFO had higher mean spectral amplitude, longer mean duration, and lower mean frequency than physiological-induced HFO. In individual patients, support vector machine analysis correctly classified pathological HFO with sensitivities ranging from 70-98% and specificities >90% in all but one patient. In this patient, infrequent high-amplitude HFO were observed in the motor cortex just before movement onset in the motor task. This finding raises the possibility that in epileptic brain physiological-induced gamma can assume higher spectral amplitudes similar to those seen in pathologic HFO. This method if automated and validated could provide a step towards differentiating physiological HFO from pathological HFO and improving localization of epileptogenic brain.
Pathological brain network activity: memory impairment in epilepsy
- Michał Tomasz Kucewicz
- Gregory A. Worrell
- Jean Gotman
2013 NEUROLOGY
Our thinking, memory and cognition in general, relies upon precisely timed interactions among neurons forming brain networks that support cognitive processes. The surgical evaluation of drug-resistant epilepsy using intracranial electrodes provides a unique opportunity to record directly from human brain and to investigate the coordinated activity of cognitive networks. In this issue of Neurology®, Kleen and colleagues1 implicate pathologic hippocampal network activity during specific memory processes in the occurrence of errors in patients' performance on a short-term memory task.
PCR test for Microsporum canis identification
- Anna Brillowska-Dąbrowska
- Ewelina Michałek
- Ditte Marie Saunte
- Sanne Sogaard Nielsen
- Maiken Cavling Arendrup
2013 MEDICAL MYCOLOGY
Microsporum canis, for which the natural hosts are cats and dogs, is the most prevalent zoophilic agent causing tinea capitis and tinea corporis in humans. We present here a diagnostic PCR test for M. canis, since its detection and species identification is relevant to the choice of treatment and to the understanding of a probable source of infection. An M. canis-specific PCR was evaluated using 130 clinical isolates of dermatophytes (including M. canis [n = 15] and 13 other species), 10 yeast or mold isolates, 12 hair and skin samples from animals with or without experimental M. canis infection, and 35 patient specimens, including seven specimens positive for M. canis and 15 dermatophyte negative samples. All pure cultures, animal specimens and clinical samples with M. canis were detected by the PCR test, whereas none of the other fungal isolates or samples without M. canis was negative. This study indicates that the PCR test for M. canis identification applied directly to patient specimens or animal hair, as well as to clinical isolates had 100% specificity and sensitivity.
Peptydy przeciwgrzybowe
- Marta Schielmann
2013
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