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Wyszukujesz frazę "Sikorski, A." wg kryterium: Autor


Tytuł:
Properties of Confined Polymer Melts
Autorzy:
Sikorski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2041818.pdf
Data publikacji:
2005-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.50.Ng
36.20.Ey
61.25.Hq
Opis:
Properties of simple models of confined linear polymer chains were studied by means of the Monte Carlo method. Model chains were built of united atoms (statistical segments) and embedded to a simple cubic lattice. Then polymers were put into a slit formed by two parallel impenetrable surfaces. Chain lengths were varied up to 800 segments and the density of the polymer melt was changed up to 0.5. A Metropolis-like sampling Monte Carlo algorithm was used to determine the static properties of this model. The influence of the size of the confinement, the polymer melt concentration and the chain length on the chain's size and the structure was studied. The universal behavior of all confined polymer linear chains under consideration was found and discussed.
Źródło:
Acta Physica Polonica A; 2005, 107, 3; 443-450
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FACET5 in the recruitment and managing process as regards production personnel – case study
Autorzy:
Sikorski, A.
Powiązania:
https://bibliotekanauki.pl/articles/111787.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
Facet5
competences
measuring employees’ potential
recruitment
managing talents
rekrutacja personelu
zarządzanie personelem
kompetencje
Opis:
The hereby article describes the study of two cases, the recruitment process as regards a newly created position and the decision concerning promotion to a managerial position. In both cases tool called Facet5 (used for measuring employees' potential) was applied to support decisions connected with human resources. As far as the first case is concerned, the profile of an ideal candidate was established. Then the profiles of three candidates selected based on content were compared to the aforementioned profile of an ideal candidate. As regards the second case, the analysis of the strengths and weaknesses in the employee profile and comparing the benchmarks concerning the particular position confirmed the subjective assessments of the supervisors and contributed to making the right decision. The issues connected to the increasing significance of soft competences, talent management in organization and organizational culture in terms of employee effectiveness and corporate competitive were discussed as well. Analyzed situations indicate the potential value resulting from the usage of tools for researching employees’ potential.
Źródło:
Production Engineering Archives; 2017, 15; 36-40
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Shape of Confined Polymer Chains
Autorzy:
Sikorski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2035734.pdf
Data publikacji:
2003-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.50.Ng
05.10.Ln
61.25.Hq
Opis:
The linear polymer chains were modeled on a simple cubic lattice. The excluded volume was included into the model while the system remained athermal (no attractive interactions) which simulated the good solvent conditions. The polymer chain was located between two parallel impenetrable walls and the distance between the walls was changing. No interaction between walls and polymer segments was assumed. These models of polymer chains were simulated by the means of the Monte Carlo method. In the sampling algorithm we used the micromodifications of chain's conformations to sample efficiently the conformational space. The size of the chain did not change monotonically for all lengths under consideration (up to 800 statistical segments). For distances between the plates close to the double value of chain's radius of gyration the size of the chain approached its minimum value. It was shown that scaling of chain dimensions with its length changed from N$\text{}^{1.18}$ to N$\text{}^{1.5}$ while the distance between the walls was decreasing. The behavior of the asymmetry of the chain was found to be analogous to that of the radius of gyration.zapisz i p
Źródło:
Acta Physica Polonica A; 2003, 103, 4; 339-347
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of Dense Polymer Systems Confined to a Slit
Autorzy:
Sikorski, A
Powiązania:
https://bibliotekanauki.pl/articles/2044630.pdf
Data publikacji:
2006-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.50.Ng
05.10.Ln
61.25.Hq
Opis:
The linear polymer chains were approximated as series of identical segments on a simple cubic lattice. The excluded volume was included into the model with no attractive interactions which corresponded to the good solvent conditions. The polymer chains were put into a slit formed by a pair of parallel surfaces. These walls were impenetrable for polymer segments and no other interactions between walls and chains were assumed. The models chains were studied by the means of the Monte Carlo method. The sampling algorithm was Metropolis-type and employing micromodifications of chain's conformation to sample efficiently the conformational space. The influence of the chain length, density of the polymer system, and the distance between the surfaces on the shape of macromolecules was studied. It was found that the decrease in the size of the slit and the decrease in the polymer density led to the formation of more spherical macromolecules. This is partially caused by the interpenetration of polymer chains.
Źródło:
Acta Physica Polonica A; 2006, 109, 2; 133-141
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fiber Processing of Queries on Hierarchical Data
Włókniste przetwarzanie zapytań w hierarchicznych strukturach danych
Autorzy:
Sikorski, A.
Powiązania:
https://bibliotekanauki.pl/articles/282124.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
włókna
zapytanie ścieżkowe
złączenie strukturalne
fiber processing
path query
structural join
Opis:
This paper is dealing with fiber processing of XPath queries. We make use of the Structural Join (SJ) method that we modify so as to achieve an improved number of page fetches containing input data. The fiber aggregation based composition, defined in this paper, allows local optimization of individual search steps taking advantage either of input Iow cardinality or high selectiveness of parent-child join.
W pracy omówiono wykorzystanie włókien - pewnej odmiany wątku - do celów efektywnego przetwarzania zapytań XPath. Zmodyfikowano standardowy algorytm złączenia strukturalnego w celu zmniejszenia liczby operacji 10. Zaproponowana metoda agregacji włókien pozwala na lokalną optymalizację składowych zapytania hierarchicznego. Optymalizacja wykorzystuje zarówno informacje o rozmiarze zbioru wejściowego jak i wysoką selektywność typową dla złączenia rodzic-dziecko (w przeciwieństwie do mniej selektywnych złączeń przodek-potomek).
Źródło:
Automatyka / Automatics; 2012, 16, 2; 165-173
1429-3447
2353-0952
Pojawia się w:
Automatyka / Automatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Budowa mostu przez Odrę w Kędzierzynie-Koźlu
Autorzy:
Sikorski, A.
Powiązania:
https://bibliotekanauki.pl/articles/363331.pdf
Data publikacji:
2010
Wydawca:
Nowoczesne Budownictwo Inżynieryjne
Tematy:
budowa
most
obwodnica
ruch tranzytowy
bridge
building
ring road
through traffic
Opis:
Dla usprawnienia ruchu tranzytowego z północy na południe ziemi opolskiej, przez Kotlinę Raciborską w kierunku granicy czeskiej, należało wybudować kolejną przeprawę przez Odrę. Przeprawa ta w zdecydowany sposób ułatwi również komunikację wewnętrzną rozciągniętej na wielu kilometrach aglomeracji śląskiej.
Źródło:
Nowoczesne Budownictwo Inżynieryjne; 2010, 2; 24-29
1734-6681
Pojawia się w:
Nowoczesne Budownictwo Inżynieryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie właściwości wektorowych metod regulacji momentu i strumienia maszyny indukcyjnej (DTC i FOC)
Comparison of the properties of the AC motor torque and flux vectorial control methods (the DTC and FOC)
Autorzy:
Sikorski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1375023.pdf
Data publikacji:
2005
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
metoda DTC
metoda FOC
DTC
FOC
maszyny indukcyjne
silniki elektryczne
Opis:
Field oriented control (FOC) and direct torque control (DTC) are becoming the industrial standards for induction motors torque control. Direct torque control method proposed by Takahasi and Noguchi in 1985 in spite of its disadvantages (flux vector hexagonal in shape and distorted current for small motor speed) is competitive to the flux oriented methods of control (FOC). FOC and DTC method comparative analysis are performed to show the basic distinctness of the both. This paper is aimed to give a contribution for a detailed comparison between two control techniques, emphasizing advantages and disadvantages. The analyze performed in this article shows the likeness of the both methods in scope of scheme and properties. The comparison of the FOC method with linear PI controller, nonlinear delta-modulation controller or look up table method and standard DTC method were carry out. The performance of the two basic control schemes is evaluated in terms of torque and current ripple, and transient response to step variations of the torque command. The analysis has been carried out on the basis of the results obtained by laboratory investigation.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2005, 72; 219-224
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nowy, nieliniowy regulator prądu a dynamika kształtowania momentu silnika indukcyjnego
The novel non-linear current regulator - dynamic torque forming of AC motor
Autorzy:
Ruszczyk, A.
Sikorski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2076334.pdf
Data publikacji:
2006
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
silnik indukcyjny
regulator pądu
regulator predykcyjny
moment
Opis:
This paper describes a possibility of the new, non-linear current controller usage. This current controller was compared with delta modulation controller. By the predictive current controller usage the current shape quality was improved. The THD(I) coefficient of the output current was reduced about 30%. The average magnitude of the current error vector was decreased about 40%. It causes less power losses and less torque fluctuations of induction machine. Simultaneously with THD(I) decrease, the reduction of transistors switching number was achieved. The switching frequency of DC/AC inverter was reduced about 94% at low motor speed range in comparison to delta modulation controller use. It means the inverter efficiency improvement. The predictive controller has not disadvantage of delta modulation controller called as average current error. The new current controller keep extremely good dynamics in transient state comparable to delta modulation controller. It was shown on experimental research. The new, non-linear current controller and control system of DC/AC inverter was realized by microprocessor system usage. It ensure good dynamics of torque forming and better efficiency of combined, inverter-motor system.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2006, 75; 31-36
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena właściwości układów przekształtnikowych (FOC, DTC, DTC-SVM zasilających maszynę indukcyjną
Evaluation of the proprieties of the inverter (FOC, DTC, DTC- SVM) fed AC motor
Autorzy:
Sikorski, A.
Ruszczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/2076337.pdf
Data publikacji:
2006
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
maszyna indukcyjna
metoda sterowania
układ przekształtnikowy
Opis:
The most articles presenting the new control method of DC/AC inverters feeding AC motors still exhibited their advantages are biased against another known methods. It is consequence a lack of complete knowledge concerning the competitive methods. The most objective are a reviewed articles but their limitations prevents authors from the exactly methods comparison. In the scientific papers the technical properties are the most frequently presented. For the system users additionally the economic aspect especially during exploitation process is very important. The economic effectiveness during exploitation depends on a repair costs connected with device reliability and on the energy conversion efficiency. The converter reliability to a large degree depends on producer experience and on the used method of control. The users often are looking on the devices technical properties and do not attach importance to a few percentage of efficiency, which during long-lasting operation has important economic aspect. Additionally, the converter efficiency has also influence its method of control. The technical aspects alternating with economical aspects, therefore the very important problem presents the comparison of well-known methods of control (DTC, DTC-SVM, FOC).
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2006, 75; 25-30
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Predictive current control of three-phase matrix converter with GaN HEMT bidirectional switches
Autorzy:
Nowaszewski, K.
Sikorski, A.
Powiązania:
https://bibliotekanauki.pl/articles/202007.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
predictive control
matrix converter
GaN HEMT
LC filter
bidirectional switch
Opis:
This paper presents an analysis and simulation studies of three-phase matrix converter with GaN HEMT bidirectional switches with predictive control of grid currents and converter output currents. Two methods of grid currents shaping are described and compared. The first method is based on calculations of instantaneous grid reactive power and the second one uses the active power of the load. The analyzed converter works with the resistive-inductive load, and from the grid side the LC filter with damping resistor has been used.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1077-1085
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł

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