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Wyszukujesz frazę "Markowski, A." wg kryterium: Wszystkie pola


Tytuł:
Influence of Repeller Potential on Ion-Molecule Reactions in $H_2S$ and $CH_4$ Mixtures
Autorzy:
Wójcik, L.
Markowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1503759.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.75.+h
82.30.Fi
Opis:
Ion-molecule reactions initiated by electron impact in the hydrogen sulfide-methane mixtures have been studied by means of quadrupole mass spectrometer with a high-pressure ion source. The total gas pressure of investigated mixtures was changed from 0.7 to 33.3 Pa. Influence of repeller potential on ion-molecule reactions have been studied. The repeller potential was changed in the range 2-12 V. Measurements were performed for different concentrations of methane and hydrogen sulfide in the mixture (from 10% $H_2S$ + 90% $CH_4$ to 90% $H_2S$ + 10% $CH_4$ with 10% increment). The major ion-molecule reactions have been identified. The primary ions $C^{+},$ $CH^{+},$ $CH_2^{+},$ $CH_3^{+},$ $CH_4^{+},$ $S^{+},$ $HS^{+},$ $H_2S^{+}$ produced in gas by the electrons with the energy of 300 eV and secondary $CH_5^{+},$ $C_2H_5^{+},$ $H_3S^{+},$ $H_2^{34}S^{+},$ $H_3^{34}S^{+},$ $CHS^{+},$ $CH_3S^{+},$ $S_2^{+},$ $HS_2^{+},$ $H_2S_2^{+}$ and $H_3S_2^{+}$ from the ion-molecule reactions were observed. Relative intensities for primary and secondary ions are presented as a function of potential of repeller electrode and concentration of methane in the mixture.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 13-15
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Azure platform in measuring - control systems based on Internet of Things concept
Autorzy:
Szulim, R.
Markowski, A.
Michta, E.
Powiązania:
https://bibliotekanauki.pl/articles/114638.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
internet of things (IoT)
cloud computing
control – measurement systems
Opis:
In the paper, selected issues referring to the usage of Azure platform to build measuring - control systems using Internet of Things concept (IoT) are presented. The most important problems to overcome during the implementation of this type of tasks concerning the functioning of the existing implementations of the Internet and their solutions through the use of some functionality of the Azure platform are discussed.
Źródło:
Measurement Automation Monitoring; 2016, 62, 7; 245-247
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mass Spectrometric Study of Positive Ion-Molecule Reactions in the $C_{3}H_{6}$ and Ar Mixtures Inside the High Pressure Ion Source
Autorzy:
Markowski, A.
Szot, E.
Wójcik, L.
Powiązania:
https://bibliotekanauki.pl/articles/1400475.pdf
Data publikacji:
2013-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.30.Fi
07.75.+h
07.81.+a
92.60.Sz
Opis:
Ion-molecule reactions have been measured for the propene-argon mixtures of different compositions using a quadrupole mass spectrometer with a high-pressure ion source. The concentration of propane in these mixtures ranged from 10% to 90% (at 10% increment). The following primary and secondary ions: $CH_{5}^{+}$ (m/q=17), $C_{2}H_{2}^{+}$ (m/q=26), $C_{2}H_{3}^{+}$ (m/q=27), $C_{2}H_{4}^{+}$ (m/q=28), $C_{2}H_{5}^{+}$ (m/q=29), $C_{3}H_{3}^{+}//\text{}^{39}Ar^{+}$ (m/q=39), $C_{3}H_{4}^{+}//\text{}^{40}Ar^{+}$ (m/q=40), $C_{3}H_{5}^{+}$ (m/q=41), $C_{3}H_{6}^{+}//\text{}^{42}Ar^{+}$ (m/q=42), $C_{3}H_{7}^{+}$ (m/q=43), $C_{3}H_{8}^{+}$ (m/q=44), $C_{4}H_{5}^{+}$ (m/q=53), $C_{4}H_{6}^{+}$ (m/q=54), $C_{4}H_{7}^{+}$ (m/q=55), $C_{4}H_{8}^{+}$ (m/q=56), $C_{4}H_{9}^{+}$ (m/q=57), $C_{5}H_{5}^{+}$ (m/q=65), $C_{5}H_{6}^{+}$ (m/q=66), $C_{5}H_{7}^{+}$ (m/q=67), $C_{5}H_{8}^{+}$ (m/q=68), $C_{5}H_{9}^{+}$ (m/q=69), $C_{5}H_{10}^{+}$ (m/q=70) were observed. Relative ion current intensities for primary and secondary ions are presented as a function of both total mixtures pressure and concentration of propene in the mixture. Primary ions were produced by electrons with the energy of 300 eV. The potential of repeller electrode $V_{R}$ inside the ion source collision chamber was fixed at 5 V for all measurements. The total mixture pressure was changed from 0.7 to 26.6 Pa. Schemes of ion-molecule reactions were proposed.
Źródło:
Acta Physica Polonica A; 2013, 123, 5; 911-915
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of management intensification tendencies of groups of farms of different production profiles
Porównanie charakteru intensywności gospodarowania grup gospodarstw o różnych kierunkach produkcji
Autorzy:
Kopinski, J.
Berbeć, A.K.
Markowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1790518.pdf
Data publikacji:
2019
Wydawca:
The Polish Association of Agricultural and Agribusiness Economists
Tematy:
direct costs
production value
gross margin
production profile
agricultural farms
koszty bezpośrednie
wartość produkcji
nadwyżka bezpośrednia
kierunek
produkcji
gospodarstwo rolne
Opis:
The study compares the trends of changes in the intensity of management (direct costs incurred) in relation to changes in the value of production in groups of farms with different production profiles. The basis for comparative analysis were the results of surveys conducted in 2004-2017, in several dozen large, market-oriented farms. The specific structure of gross commodity production was the main criterion for the division of farms into groups. The analysis showed that in all groups, production intensification, justified by economic results (without subsidies or direct payments) (type I), was effective and based on current prices. The most intensive production, in terms of incurred costs as well as land productivity and labor productivity, was carried out on pig farms – farm type least dependent on available land resources. Direct costs incurred in this group of farms were (in relation to 1 ha of AL) about three times higher than the average in other groups. Also, the highest increase in gross margin without additional payments was observed in this group.
W opracowaniu dokonano porównania tendencji zmian intensywności gospodarowania (według ponoszonych kosztów bezpośrednich) w odniesieniu do zmian wartości produkcji w grupach gospodarstw o różnych kierunkach produkcji. Podstawę analizy porównawczej stanowiły wyniki badań ankietowych prowadzonych w latach 2004-2017 w 43 gospodarstwach rolniczych, większych obszarowo i o dużym powiązaniu z rynkiem. Wyznacznikiem kierunku prowadzonej produkcji, jako kryterium podziału na grupy, była określona struktura produkcji towarowej brutto. Z przeprowadzonej analizy wynika, że we wszystkich grupach następowało uzasadnione wynikami ekonomicznymi (bez dopłat i płatności) efektywne intensyfikowanie produkcji (typ I), według cen bieżących. Najbardziej intensywną produkcję pod względem przepływów pieniężnych oraz produktywności ziemi i wydajności pracy prowadzono w gospodarstwach ukierunkowanych na tucz trzody chlewnej. Jest to kierunek produkcji najmniej uzależniony od posiadanych zasobów ziemi. Poziom ponoszonych kosztów bezpośrednich w odniesieniu do 1 ha UR był w tej grupie 3-krotnie wyższy niż przeciętnie w pozostałych. Także w tej grupie gospodarstw nastąpił najwyższy wzrost wartość nadwyżki bezpośredniej bez dopłat.
Źródło:
Annals of The Polish Association of Agricultural and Agribusiness Economists; 2019, 21, 2; 162-169
2657-781X
2657-7828
Pojawia się w:
Annals of The Polish Association of Agricultural and Agribusiness Economists
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimal positive realizations of linear continuous-time fractional descriptor systems: Two cases of an input-output digraph structure
Autorzy:
Markowski, K. A.
Powiązania:
https://bibliotekanauki.pl/articles/330387.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fractional system
positive system
descriptor system
digraph structure
digraph mask
układ ułamkowy
układ dodatni
układ deskryptorowy
Opis:
In the last two decades, fractional calculus has become a subject of great interest in various areas of physics, biology, economics and other sciences. The idea of such a generalization was mentioned by Leibniz and L'Hospital. Fractional calculus has been found to be a very useful tool for modeling linear systems. In this paper, a method for computation of a set of a minimal positive realization of a given transfer function of linear fractional continuous-time descriptor systems has been presented. The proposed method is based on digraph theory. Also, two cases of a possible input-output digraph structure are investigated and discussed. It should be noted that a digraph mask is introduced and used for the first time to solve a minimal positive realization problem. For the presented method, an algorithm was also constructed. The proposed solution allows minimal digraph construction for any one-dimensional fractional positive system. The proposed method is discussed and illustrated in detail with some numerical examples.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 1; 9-24
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parallel Digraphs-building Computer Algorithm for Finding a Set of Characteristic Polynomial Realisations of Dynamic System
Autorzy:
Hryniów, K.
Markowski, K. A.
Powiązania:
https://bibliotekanauki.pl/articles/384585.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
dynamic system
GPGPU
characteristic polynomial
digraphs
algorithm
Opis:
This paper presents in-depth the parallel computer algorithm for the determination of characteristic polynomial realisations of dynamic system. The main differences between the depicted method and other state of- the-art solutions include finding not few realisations, but a whole set, and the fact that the found realisations are always minimal among all possible. As digraphsbuilding methods used in the algorithm are NP-complete or NP-hard problems, the algorithm is paralleled and GPGPU (General-Purpose computing on Graphics Processor Units) computation is proposed as the only feasible solution. The article describes in detail the proposed method, discusses it’s complexity, presents optimisation solutions and still open problems. The working algorithm is illustrated with a numerical example and compared to results of other known methods.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2016, 10, 3; 38-51
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digraph-building method for finding a set of minimal realizations of 2-D dynamic systems
Autorzy:
Markowski, K. A.
Hryniów, K.
Powiązania:
https://bibliotekanauki.pl/articles/200035.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
2-D system
characteristic polynomial
digraph
minimal realization
MATLAB
system 2D
wielomian
graf dwudzielny
Opis:
This paper presents a digraph-building method designed to find the determination of realization of two-dimensional dynamic system. The main differences between the method proposed and other state-of-the-art solutions used include finding a set of realizations (belonging to a defined class) instead of only one realization, and the fact that obtained realizations have minimal size of state matrices. In the article, the proposed method is described, compared to state-of-the-art methods and illustrated with numerical examples. To the best of authors’ knowledge, the method shown in the paper is superior to all other state-of-the-art solutions both in terms of number of solutions and their matrix size. Additionally, MATLAB function for determination of realization based on the set of state matrices is included.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 589-597
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Whipple’s disease as a systemic infectious disease – a case presentation
Autorzy:
Maciorkowska, M.
Ustymowicz, W.
Zakrzewski, M.
Pryczynicz, A.
Markowski, A.
Romatowski, J.
Guzińska-Ustymowicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/1918601.pdf
Data publikacji:
2018-06-21
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
infectious disease
systemic disease
Tropheryma whipplei
Whipple’s disease
Opis:
Introduction: Whipple’s disease is a chronic systemic infectious disorder with Tropheryma whipplei as an etiologic agent, occurring rarely and affecting numerous organs and systems. The variety of symptoms and a non-typical course make it difficult to establish a proper diagnosis. Purpose: In this study, etiopathogenesis, diagnostics and treatment of Whipple’s disease were presented based on the case report of 60-year-old man diagnosed with Whipple’s disease. Case presentation: Persistent diarrhoea with weight loss, lymphadenopathy in the abdominal cavity and moderate microcytic anemia predominated in the clinical picture. Diagnosis was put based on the clinical picture and macroscopic assessment of the small intestine and the presence of macrophages filled with a PAS-positive substance in the lamina propria. To deepen diagnostics, samples collected were assessed showing macrophages with the damaged mucosa, containing numerous elongated micro-organisms whose ultrastructure corresponded to Tropheryma whipplei. The patient’s clinical conditions improved after antibiotic therapy. Conclusions: It is vital to remember about Whipple’s disease in patients with chronic diseases due to a non-specific clinical picture and difficulties in establishing a proper diagnosis. When the disease is diagnosed unequivocally, proper and effective antibiotic therapy should be instituted immediately.
Źródło:
Progress in Health Sciences; 2018, 8(1); 212-218
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Different fractional order models for an experimental smart beam system
Autorzy:
Markowski, K. A.
Birs, I.
Muresan, C. I.
Prodan, O.
Powiązania:
https://bibliotekanauki.pl/articles/200269.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
realization
fractional calculus
fractional order system identification
smart beam system
digraphs method
realizacja
rachunek różniczkowy
system ułamkowy
Opis:
The applicability of fractional calculus in system engineering outperforms classic identification techniques due to its ability to depict physical phenomena with increased accuracy. The present study explores the increased accuracy and flexibility of a fractional order model applied to an experimental smart beam depicting an airplane wing. The paper details the fractional order system identification of the beam and explores the possibility of realization of the model.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 4; 485-493
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Australian Polonia: A Diaspora on the Wane?
Autorzy:
Markowski, Stefan
Kwapisz Williams, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/498745.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Australia
citizenship
diaspora
ethnic community
nationality
Polonia
Opis:
As a country of immigration, Australia is an interesting laboratory of the dynamics of migrant settlement, diaspora development and sustainment. In this paper we discuss the Polish immigrant community in Australia: Australian Polonia, which is an example of a community of permanent settlers who blended into the Australian host community but retained enough elements of their distinct identity to be considered a part of the Polish emigrant diaspora. This is a traditional diaspora in that it largely excludes temporary migrants. We explore the nature of its attachment to Poland and Polish culture, and discuss the multiple identities of these migrants. The research question that we ask is: in what sense do members of Australian Polonia, ‘belong’ to the Polish diaspora, i.e. how are they attached to ‘things Polish’? Our sources of information include official statistics, mainly the Census of Population (2011), and a survey of Australian Polonia conducted in 2006.
Źródło:
Central and Eastern European Migration Review; 2013, 2, 1; 13-36
2300-1682
Pojawia się w:
Central and Eastern European Migration Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocomposite coating for medical applications
Autorzy:
Długoń, E.
Markowski, J.
Plich, J.
Wiecheć, A.
Błażewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/285256.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanocomposites
metallic implants
maxillofacial surgery
Źródło:
Engineering of Biomaterials; 2016, 19, 138; 92
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frictional properties of selected seeds
Autorzy:
Kaliniewicz, Z.
Markowski, P.
Anders, A.
Jadwisieńczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/298455.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
physical attributes
coefficient of external friction
relation
Opis:
The thickness, width, length and weight of five seed species (buckwheat, vetch, pea, lupine and faba bean) and their external friction angle were determined on two types of surfaces - steel and rubber. The experiment was performed with the use of a an inclined plane with an adjustable angle of inclination that measures the angle of external friction and the time taken by seeds to travel a given distance, which supports the determination of the coefficient of kinetic friction. The measured parameters were used to calculate arithmetic and geometric mean diameter, aspect ratio and sphericity index. The dimensions, weight and the calculated indicators of the examined seeds did not significantly affect their coefficients of static and kinetic friction or their coefficients of rolling resistance and rolling friction. The studied parameters were largely influenced by the type of friction surface, and significantly lower average values were reported for steel than rubber. In the studied seed species, the static friction coefficient was determined in the range of 0.187 to 0.582, kinetic friction coefficient - 0.134 to 0.479, rolling resistance coefficient - 0.148 to 0.529 and rolling friction coefficient - 0.29 to 1.80 mm.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2015, 18(2); 85-101
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-Ray Absorption Near Edge Structure Analysis of HgMnSe, HgFeSe and HgTeSe
Autorzy:
Burattini, E.
Kisiel, A.
Markowski, R.
Dalba, G.
Giriat, W.
Powiązania:
https://bibliotekanauki.pl/articles/1924330.pdf
Data publikacji:
1993-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Dm
Opis:
Experimental studies of the Se K X-ray absorption edges have been carried out in HgTe$\text{}_{0.5}$Se$\text{}_{0.5}$, Hg$\text{}_{0.8}$Mn$\text{}_{0.2}$Se and Hg$\text{}_{0.9}$Fe$\text{}_{0.1}$Se. A comparison is made for Hg$\text{}_{0.5}$Mn$\text{}_{0.5}$Se and Hg$\text{}_{0.5}$Fe$\text{}_{0.5}$Se theoretical results obtained by the self-consistent, semi-relativistic LMTO method within the LD approximation. Small differences of Se K edge XANES have been shown for HgTeSe and HgSe in contrary to evident differences for HgMnSe and HgFeSe. This behaviour of the absorption Se K edges is related to significant, hybridized contribution of the 3d and 4s Mn or Fe unoccupied states. The maximal contributions of the hybridized bands of the hypothetic zinc-blende MnSe or FeSe were estimated using the virtual crystal model. These maximal contributions are situated at about 6 eV and 17 eV in zinc-blende MnSe and at -0.8 eV and 5.5 eV in zinc-blende FeSe. For HgFeSe apart from the evidence of the strongly localized resonant donor (empty for low Fe concentrations) the complementary hybridized contribution of Fe 3d empty states also situated around the conduction band minimum should be taken into consideration.
Źródło:
Acta Physica Polonica A; 1993, 83, 1; 107-114
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-Ray Absorption Near Edge Spectra for CdTe - Theoretical Study
Autorzy:
Oleszkiewicz, J.
Markowski, R.
Kisiel, A.
Powiązania:
https://bibliotekanauki.pl/articles/1920906.pdf
Data publikacji:
1992-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Dm
78.20.Bh
78.20.Dj
Opis:
The theoretical band structure of the CdTe was calculated using conventional, ab initio, self-consistent, relativistic LMTO method. The projected density of states and the dielectric function were produced within the local density approximation. Spin-orbit coupling was included in the perturbation approach. X-ray absorption spectra for the Cd L$\text{}_{1,3}$- and Te L$\text{}_{1,3}$-edges were calculated and the results compared with experimental data. The teoretical results were obtained from the calculations with inclusion of k-dependent transition matrix elements, spin-orbit coupling, extended set of basis functions and finite lifetime of initial and final states. They were compared with other calculations which use common constant matrix element approximation. The work presents final conclusion concerning validity of using constant matrix element approximation within one-electron scheme.
Źródło:
Acta Physica Polonica A; 1992, 82, 2; 323-328
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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