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Wyszukujesz frazę "Wisniewski, R." wg kryterium: Autor


Tytuł:
Local analysis of hybrid systems on polyhedral sets with state-dependent switching
Autorzy:
Leth, J.
Wisniewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/330556.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
inkluzja różniczkowa
badanie stabilności
układ hybrydowy
stability analysis
switched system
hybrid system
differential inclusion
Opis:
This paper deals with stability analysis of hybrid systems. Various stability concepts related to hybrid systems are introduced. The paper advocates a local analysis. It involves the equivalence relation generated by reset maps of a hybrid system. To establish a tangible method for stability analysis, we introduce the notion of a chart, which locally reduces the complexity of the hybrid system. In a chart, a hybrid system is particularly simple and can be analyzed with the use of methods borrowed from the theory of differential inclusions. Thus, the main contribution of this paper is to show how stability of a hybrid system can be reduced to a specialization of the well established stability theory of differential inclusions. A number of examples illustrate the concepts introduced in the paper.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2014, 24, 2; 341-355
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of the quintic equation of the state based model for the calculations of different thermodynamic properties
Autorzy:
Kozioł, A.
Wiśniewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/778661.pdf
Data publikacji:
2008
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
równanie stanu
równowaga para-ciecz
wielomiany Hermita
NBP equation of state
vapour-liquid equilibrium
cubic Hermite polynomials
Opis:
Different thermodynamic properties (the vapour density, the liquid density and the saturation pressure) were calculated by the model based on the Nakamura-Breedveld-Prausnitz equation of state (NBP EOS). Since the original form of the NBP EOS often generates inaccurate results for liquids, it was modified to describe this phase better. The calculations were realized in the subcritical region. So far, the temperature-dependent NBP EOS parameters have been obtained by special correlations. Their constants were fitted to a lot of experimental data. In this paper the equation of state temperature-dependent parameters were obtained by a new method which was based at piecewise cubic Hermite interpolating polynomials (PCHIPs). In the proposed method some experimental data (called the key ones) were used, thus reducing the experimental effort. Seven substances were chosen for the test calculations. Each of them is common in industry. The calculation results were compared with the experimental data. The new method has made an accurate description of vapour-liquid equilibrium for the considered pure substances over a wide temperature range possible.
Źródło:
Polish Journal of Chemical Technology; 2008, 10, 1; 6-10
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of selected chemical and physical factors on the activity of Dreissena polymarpha (Pallas, 1771)
Autorzy:
Nowacki, P.
Wisniewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/83363.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Źródło:
Folia Malacologica; 2002, 10, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Euler-Poincare reduction of externally forced rigid body motion
Autorzy:
Wiśniewski, R.
Kulczycki, P.
Powiązania:
https://bibliotekanauki.pl/articles/970328.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
modelowanie
sterowanie
ruch ciała sztywnego
mechanika Lagrange'a
kształtowanie energetyczne
modelling
control
rigid body motion
Lagrange mechanics
energy shaping
Opis:
If a mechanical system experiences symmetry, the Lagrangian becomes invariant under a certain group action. This property leads to substantial simplification of the description of movement. The standpoint in this article is a mechanical system affected by an external force of a control action. Assuming that the system possesses symmetry and the configuration manifold corresponds to a Lie group, the Euler-Poincare reduction breaks up the motion into separate equations of dynamics and kinematics. This becomes of particular interest for modeling, estimation and control of mechanical systems. A control system generates an external force, which may break the symmetry in the dynamics. This paper shows how to model and to control a mechanical system on the reduced phase space, such that complete state space asymptotic stabilization can be achieved. The paper comprises a specialization of the well-known Euler-Poincare reduction to a rigid body motion with forcing. An example of satellite attitude control illustrates usefulness of the Euler-Poincare reduction in control engineering. This work demonstrates how the energy shaping method applies for Euler-Poincare equations.
Źródło:
Control and Cybernetics; 2004, 33, 2; 297-310
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomalous Low Resistivity at Room and Elevated Temperatures of Manganin Alloy Implanted with High Dose Niobium Ions
Autorzy:
Wiśniewski, R.
Wilczyńska, T.
Powiązania:
https://bibliotekanauki.pl/articles/1492783.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Eb
Opis:
The anomalous low resistivity metallic material at room temperature has been discovered. Known high resistive material called manganin in form of 10 μm thick foil was one side implanted with high dose of niobium ions of 2.5 × $10^{17}$ Nb ions/$cm^2$ and then with 2.5 × $10^{13}$ Kr ions/$cm^2$. Before and after implantation procedure investigated manganin foils were temperature treated in 130°C during 100 h. Basic resistance measurements were performed just after implantation observing large decrease of its resistivity. In repeated measurements after long time later (about twelve months), at temperature of 22°C, practically no resistivity was measured. Four-terminal method for resistance measurements was used.
Źródło:
Acta Physica Polonica A; 2011, 120, 6; 1080-1083
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compressibility of $AgI-Ag_{2}MoO_{4}$ System Measured in Wide Range of Composition
Autorzy:
Wiśniewski, Z.
Wiśniewski, R.
Wilczyńska, T.
Powiązania:
https://bibliotekanauki.pl/articles/1538417.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Er
61.66.Dk
62.50.-p
Opis:
Results of compressibility measurements of $AgI-Ag_{2}MoO_{4}$ materials for different concentrations of AgI were presented. The obtained results were compared with phase diagram and internal structure of material. It was found that observed values of compressibility coefficient can be related to internal structure of investigated material.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 601-602
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conditions of the Professionalization of the Surveying Graduate Profi le in Poland
Warunki profesjonalizacji kształcenia na wydziałach o profilu geodezyjnym w Polsce
Autorzy:
Wiśniewski, R.
Brzezicka, J.
Źróbek, S.
Powiązania:
https://bibliotekanauki.pl/articles/385891.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
edukacja geodetów
ścieżki kształcenia
educating surveyors
professional path of graduates
Opis:
Artykuł dotyczy kwestii profesjonalizacji kształcenia na kierunkach geodezyjnych w świetle wymagań współczesnej gospodarki. Egzemplifikację zagadnienia stanowią dane dotyczące profilu absolwentów kilku polskich uczelni. Przedstawiono w nim strategię rozwoju wydziału i kierunki zmian programów nauczania w następstwie przemian gospodarczych, rosnących możliwości uczelni wyższych, zmieniających się oczekiwań studentów i barier pojawiających się na rynku pracy. W pracy zastosowano następujące metody badawcze: studiowanie literatury, analiza wyników przeprowadzonego wcześniej badania ankietowego oraz studium przypadku. Na potrzeby pracy wykorzystano także literaturę przedmiotu, strategię rozwoju wydziału, doświadczenia autorów artykułu w tym aspekcie oraz wyniki badania absolwentów dotyczącego profesjonalnej ścieżki kształcenia na czterech wydziałach. Przeprowadzone w pracy badania i analizy pozwalają na stwierdzenie, że kształcenie na kierunkach geodezyjnych podlega procesom profesjonalizacji. Polskie uczelnie wyższe kształcące na kierunkach geodezyjnych dobrze poradziły sobie z procesami transformacji ustrojowej; dzięki zmianom w ofercie kształcenia oraz powiązaniu kształcenia z gospodarką kształcą absolwentów geodezji i kartografi i na najwyższym poziomie europejskim; aktywnie odpowiadają na zmieniające się oczekiwania studentów, dostosowując środki kształcenia do deklarowanych potrzeb; rozwijają kształcenie praktyczne znacznie wychodzące poza klasyczną geodezję i kartografię; intensywnie rozwijają wewnętrzne systemy zapewniania jakości kształcenia.
This paper concerns the issue of professional education in the faculties of the surveying educational profile in view of current economic requirements, using the example of few faculties of geodesy in Poland. It presents a strategy of faculty operation and the direction of changes in teaching curricula as a consequence of economic transformations, the growing possibilities of higher education institutions, changing expectations of students and emerging barriers in the labour market. The following research methods were applied in this paper: studies of writings, surveys and case study. The paper also uses the literature of the subject, strategic documents of the faculty, experience of the authors of the study in this field and results of a survey concerning the professional path of four faculties graduates. The studies and analyses performed in the paper lead to the conclusion that the teaching of geodetic subjects is in the process of professionalization. Polish universities offering geodetic courses, of the following, have coped with political transformations; as a result of changes in educational offerings and integrating education goals with economic ones, educate geodesy and cartography graduates at the highest level in Europe; actively react to the changing expectations of students by adjusting educational measures to their declared needs; develop practical education far beyond classical geodesy and cartography; or, have intensively developed internal educational quality control systems.
Źródło:
Geomatics and Environmental Engineering; 2016, 10, 3; 101-123
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of designing of compositional microprogram control units with mutual memory
Metody projektowania mikroprogramowanych jednostek sterujących o adresowaniu wspólnym
Autorzy:
Wiśniewski, R.
Barkalov, A. A.
Janik, A.
Powiązania:
https://bibliotekanauki.pl/articles/156222.pdf
Data publikacji:
2008
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mikroprogramowany układ sterujący
programowalny układ FPGA
compositional microprogram control unit (CMCU)
field programmable gate array (FPGA)
Opis:
In the article four designing methods of Compositional Microprogram Control Unit (CMCU) will be described and compared. The first one - with mutual memory - is traditional way of synthesis of CMCU. Here operational vertices of the initial flow chart that describes the functionality of control units are replaced with operational linear chains that permit to minimize the number of internal states of the controller. Three remaining methods are based on the CMCU with mutual memory; however there are additional improvements that allow reducing the number of logic elements that are required for implementation of CMCU on programmable device. Detailed results of investigations will be shown in the paper. Authors have performed researches where over 100 benchmarks (descriptions of CMCU) were designed with all four methods and implemented on an FPGA. Results of implementation will be studied and analyzed in detail and described in the paper.
W referacie zaprezentowane zostaną cztery metody projektowania mikroprogramowanych jednostek sterujących. Pierwsza metoda to tradycyjny sposób syntezy sterownika o adresowaniu wspólnym. Na jej podstawie opracowane zostały trzy inne metody projektowania mikroprogramowanych układów sterujących. Wprowadzono modyfikacje w strukturze sterownika, których głównym celem była redukcja liczby wykorzystanych elementów logicznych podczas implementacji systemu w matrycach FPGA. W artykule przedstawione zostaną szczegółowe wyniki badań przeprowadzonych przez autorów. Każdy sterownik zaprojektowano wszystkimi czterema metodami, a następnie przeprowadzono operacje syntezy oraz implementacji. Końcowe wyniki zajętości poszczególnych wersji w programowalnych matrycach FPGA zostaną szczegółowo przeanalizowane.
Źródło:
Pomiary Automatyka Kontrola; 2008, R. 54, nr 8, 8; 493-495
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanisms of effect of copper substratum on the adhesion, intensity of migration and mortality of the zebra mussels (Dreissena polymarpha (Pallas, 1771))
Autorzy:
Kobak, J.
Klosowska-Mikulan, E.
Wisniewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/83377.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Źródło:
Folia Malacologica; 2002, 10, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of copper substrate on survival, mobility and attachment strength of adult Dreissena polymorpha (Pall.)
Autorzy:
Kobak, J.
Klosowska-Mikulan, E.
Wisniewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/83923.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
Zebra mussels were tested for their mobility and strength of attachment in six diferent experimental combinations. They were kept for 7 days on copper or plastic (phenoplast) plates in 4-L beakers put on the bottom, or on plastic (resocart) plates suspended 15 mm above copper ones; water used was pure or with addition of a metal ion chelator - disodium versenate (EDTA). Exposure to copper ions resulted in the highest mortality. When the ions were EDTA-removed, the animals tended to leave copper plates and stay on the glass bottom or walls of the beakers. Attachment strength was measured with a device based on pan scales, with one of the pans replaced by forceps grasping a mussel. It was significantly lower in the presence of copper ions or with metallic substrate. Both the release of ions and the surface properties of copper substrate were found to influence zebra mussels, the former factor increasing their mortality, the latter causing sublethal responses. The observations may be useful in designing fouling-resistant devices and systems.
Źródło:
Folia Malacologica; 2002, 10, 2
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of a Method for Measuring Deposit Impedance Parameters Using Charge Amplifier and Lock-in Voltmeter
Autorzy:
Wiśniewski, Dariusz R.
Powiązania:
https://bibliotekanauki.pl/articles/2069749.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
impedance
conductivity
moisture content
deposit
charge amplifier
lock-in voltmeter
Opis:
Methods for measuring deposit parameters are often based on a capacitance or conductivity measurement aimed at estimating, e.g. deposit moisture content. In practice, these methods fail for materials with a low degree of homogeneity, a diverse porous structure or high conductivity, e.g. due to a high water content. This article demonstrates an approach that enables a more precise estimation of the parameters of any deposit. The presented method involves the use of a measuring system in a charge amplifier configuration and the application of a technique using lock-in detection or a lock-in voltmeter to determine resistance and capacitance parameters of a deposit based on signals received from the measuring system. This method can be successfully used wherever the test deposit material is highly heterogeneous and contains both dielectric and conductive materials. The article presents an example of a solution to a measuring system using two planar electrodes that can be dimensioned depending on the deposit dimensions. It is followed by a presentation of a method for converting the signal from the measuring system into impedance parameters of the deposit using a lock-in voltmeter. The analysis of the operation of the entire measuring system was modelled in Matlab/Simulink, and the operation results were presented.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2021, 24(1); 67--81
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hard and soft sub-time-optimal controllers for a mechanical system with uncertain mass
Autorzy:
Kulczycki, P.
Wisniewski, R.
Kowalski, P.
Krawiec, K.
Powiązania:
https://bibliotekanauki.pl/articles/970463.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
sterowanie optymalne
odporność
system mechaniczny
masa niepewna
proces stochastyczny
budowa podoptymalna
optimal control
mechanical system
uncertain mass
stochastic process
suboptimal structure
robustness
Opis:
An essential limitation in using the classical optimal control has been its limited robustness to modeling inadequacies and perturbations. This paper presents the concepts of two practical control structures based on the time-optimal approach, a hard and soft one. The hard structure is defined by the parameters selected in accordance with the rules of the statistical decision theory: however, the soft structure allows additionally for elimination of rapid changes in control values. The object is a basic mechanical system, with uncertain (also non-stationary) mass treated as a stochastic process. The methodology proposed here is of a universal nature and may easily be applied with respect to other elements of uncertainty of time-optimal controlled mechanical systems.
Źródło:
Control and Cybernetics; 2004, 33, 4; 573-587
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of microprogrammed controllers to be implemented in FPGAs
Autorzy:
Wiśniewski, R.
Barkalov, A.
Titarenko, L.
Halang, W. A.
Powiązania:
https://bibliotekanauki.pl/articles/907791.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
jednostka sterująca
sterownik mikroprogramowany
układ FPGA
control unit
microprogrammed controller
field programmable gate array (FPGA)
Opis:
In the article we propose a new design method for microprogrammed controllers. The traditional structure is improved by modifying internal modules and connections. Such a solution allows reducing the total number of logic elements needed for implementation in programmable structures, especially Field Programmable Gate Arrays (FPGAs). Detailed results of experiments show that on the average the application of the proposed methods yields up to 30% savings as far as the destination device is considered.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2011, 21, 2; 401-412
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
cDNA fingerprint from the hepatopancreatic glands of pond snails (Lymnaea stagnalis) exposed to benzo[a]pyrene
Autorzy:
Woźny, M.
Kowal, M.
Ciesielski, S.
Florczyk, M.
Wiśniewski, R.
Malicka, E.
Brzuzan, P.
Powiązania:
https://bibliotekanauki.pl/articles/363204.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
bioindicator
differential display
expressed sequence tags
polycyclic aromatic hydrocarbons
bioindykator
obraz zróżnicowanej ekspresji
ekspresja fragmentów sekwencji
policykliczne węglowodory aromatyczne
Opis:
Identification of differentially expressed genes that could be potentially used as biomarkers of PAH exposure of common invertebrate animal (like freshwater snail) would be a valuable resource for investigators interested in toxicology and biomonitoring of aquatic environments. Therefore, the aim of this research was to investigate effects of waterborne benzo[a]pyrene (B[a]P) exposure on mRNA expression in the pond snail’s (Lymnaea stagnalis) hepatopancreatic gland. Toward this end, mature individuals of pond snail (L. stagnalis) were treated with 50µM B[a]P solution in a short 36h static exposure test. Differential Display PCR (DD-PCR) was used to generate a unique cDNA fingerprint of genes that were differentially expressed in the tissues of exposed and unexposed snails. To assess the putative identity of the isolated cDNA amplicons (ESTs), BLAST queries were performed to find similarities in their nucleotide sequence. Real-Time qPCR analysis was used to verify the DD-PCR expression profile. Finally, an additional independent exposure study, including higher dose of B[a]P (100µM), was conducted to validate the expression of selected ESTs. BLAST revealed that only 3 out of 9 isolated ESTs had meaningful information on their putative nucleotide sequence identity. The highest similarity was scored for EST-A1, identified as the transcript of UAP-like protein, found to be up-regulated after B[a]P exposure. The original expression pattern that was observed in DD-PCR step was coherent with results of the qPCR verification for 3 out of 5 analyzed ESTs. However, changes in the ESTs expression were modest and the treatment with B[a]P resulted in significant down-regulation for only 1 unidentified fragment (EST-G42, almost 2-fold; p<0.05) when compared to untreated snails. Although no significant changes were observed for EST-A1 and EST-G42 in the validation study, their expression pattern was consistent with that obtained from DD-PCR. Surprisingly, EST-C5 remained in contrast to the DD-PCR part, but it showed significant down-regulation in group of snails exposed to 100µM B[a]P (3.5-fold; p<0.05). The obtained results show that diverse genes may be involved in the molecular response of the pond snail’s hepatopancreas to treatment with B[a]P. However, further research is needed to confirm the utility of the discovered EST as PAH biomarkers in biomonitoring practices with L. stagnalis as bioindicator species.
Źródło:
Environmental Biotechnology; 2014, 10, 1; 8-17
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damage distributions in GaAs single crystal irradiated with 84Kr (394 MeV), 209Bi (710 MeV) and 238U (1300 MeV) swift ions
Autorzy:
Didyk, A. Y.
Komarov, F. F.
Vlasukova, L. A.
Gracheva, E. A.
Hofman, A.
Yuvchenko, V. N.
Wiśniewski, R.
Wilczyńska, T.
Powiązania:
https://bibliotekanauki.pl/articles/146738.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
semiconductors
gallium arsenide
swift heavy ions
inelastic energy loss
atomic force microscopy (AFM)
Opis:
We are presenting a study of damage distribution in GaAs irradiated with 84Kr ions of energy EKr = 394 MeV up to the fluence of 5 × 1012 ion/cm-2. The distribution of damage along the projected range of 84Kr ions in GaAs was investigated using selective chemical etching of a single crystal cleaved perpendicularly to the irradiated surface. The damage zone located under the Bragg peak of 84Kr ions was observed. Explanation of the observed effects based on possible processes of channeling of knocked target atoms (Ga and As) is proposed.
Źródło:
Nukleonika; 2008, 53, 2; 77-82
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł

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