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Wyszukujesz frazę "Stability" wg kryterium: Temat


Tytuł:
Kształtowanie się przepisów dotyczących zapewniania stateczności poprzecznej statków w stanie nieuszkodzonym
Evolution of intact ship stability assurance
Autorzy:
Szozda, Z.
Powiązania:
https://bibliotekanauki.pl/articles/906666.pdf
Data publikacji:
2004
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
stateczność
ocena stateczności
kryteria stateczności
stability
stability assessment
stability criteria
Opis:
W artykule przedstawiono etapy formułowania kryteriów oceny stateczności statków w stanie nieuszkodzonym. Dokonano krytycznej oceny aktualnego podejścia do zapewnienia stateczności statków. Przedstawiono także bieżące zamierzenia Międzynarodowej Organizacji Morskiej w tym zakresie.
The paper presents process of formulation of intact ship stability criteria. The critical assessment of present approach to stability assurance is made. Present intentions of International Maritime Organisation in this aspect are presented.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2004, 3 (75); 129-136
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stabilność systemu finansowego Unii Europejskiej
Stability of the financial system of the European Union
Autorzy:
Mikita, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2197336.pdf
Data publikacji:
2021
Wydawca:
Kancelaria Sejmu. Biuro Analiz Sejmowych
Tematy:
financial system
financial stability
European Union
stability mechanisms
stability indicators
Opis:
The aim of the article is to present activities undertaken at the EU level to ensure financial stability, and to assess the degree of stability of the EU financial system on the basis of selected indicators. The first part of the article introduces the concept of financial system stability and describes its importance in the modern economy and the methods of estimating the stability of the financial system. The second part of the article is devoted to the presentation of activities undertaken by the EU to increase the stability of the financial system, and the assessment of financial stability on the basis of two indicators: the Z-score indicator, used to assess the stability of the banking system, and the Stock Price Volatility index, showing the stability of the capital market.
Źródło:
Studia BAS; 2021, 3(67); 87-116
2080-2404
2082-0658
Pojawia się w:
Studia BAS
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examples of weaknesses of the 2nd Generation Intact Stability Criteria
Autorzy:
Szozda, Z.
Powiązania:
https://bibliotekanauki.pl/articles/359914.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship stability
stability regulations
2nd Generation Intact Stability Criteria
Opis:
One of the main tasks of the Sub-committee on Ship Design and Construction (SDC) of the International Maritime Organization (IMO) is development of the 2nd Generation Intact Stability Criteria. The paper presents the framework and the approach agreed by the Sub-committee. The framework bases on the concept of stability failure and vulnerability assessment. However, the criteria, standards and regulations developed so far have weaknesses that may prevent some IMO Member States from adoption of the regulations on the Maritime Safety Committee (MSC) level. The paper presents some of the weaknesses that are the most important from the Author’s point of view. Awareness of the weaknesses may facilitate the future work of the Sub-committee and its working groups.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 40 (112); 80-87
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Financial stability: problems of inter-level and cross-sectoral equilibrium
Autorzy:
Gospodarchuk, Galina
Suchkova, Ekaterina
Powiązania:
https://bibliotekanauki.pl/articles/22446430.pdf
Data publikacji:
2019
Wydawca:
Instytut Badań Gospodarczych
Tematy:
financial stability
indicators of financial stability
analysis of financial stability
instruments for regulating financial stability
Opis:
Research background: As part of the creation of an effective mechanism for managing financial stability, the tasks of providing an inter-level and cross-sectoral financial equilibrium remain unresolved. So far, clear and unambiguous criteria for financial stability have not been formulated, with which monetary and prudential policies could be related, as well as measures to minimize systemic and individual risks. The problem of creating a system of indicators comes to the fore, allowing the creation of new effective instruments for regulation of financial flows that contribute to the prevention of financial crises. Purpose of the article: The paper proposes a system of indicators of financial stability, which allows for solving the tasks of inter-level and cross-sectoral equilibrium in the selection of regulatory tools for monetary and prudential policy. Methods: We have used real interest rates as a measure of financial stability at the macro level. The real rates have been calculated from time series with nominal interest rate and inflation in the credit market (divided into loans to financial and non-financial organizations and individuals), and in the bond market (divided into corporate, municipal, and federal bonds). The analysis of the market and institutional financial stability of the USA, Russia, Japan, Switzerland, Australia over the period 1984?2014 was done. Then, comprehensive investigation on the financial stability in the Russian Federation in 2014?2017 was conducted. The results have been compared against financial stability of individual banks, which was measured using profit to risk ratio. The latter has been calculated from bank?s financial reports using our method, which had been developed earlier. Findings & Value added: We have developed criteria for qualitative assessment of financial stability and the risk map, which helps to identify the level of accumulated imbalances in the market and institutional environment, as well as in the levels and sectors of the economy. The criteria for selecting monetary and prudential regulatory instruments have been formulated depending on the amount of accumulated risks. The criteria for forming a portfolio of regulatory instruments with regard to their rigidity are proposed.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2019, 14, 1; 53-79
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New generation stability norms –how to approach the task
Autorzy:
Kobyliński, L.
Powiązania:
https://bibliotekanauki.pl/articles/259826.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship stability
stability standards
risk assessment
Opis:
International stability norms included in the Code of Intact Stability 2008 adopted by IMO on 4 December 2008 constitutes the latest set of international requirements on intact stability of ships. However the requirements included in the Code, part of them compulsory (Included in the Part A of the Code), other only recommended (included in the Part B of the Code) are considered as not totally sufficient to assure safety of ships. Because of that, IMO decided that there would be the necessity to develop so called new generation stability criteria covering certain identified hazards, such as parametric resonance, loss of stability in the wave crest broaching, dead ship condition and excessive accelerations when rolling .Those criteria, or rather stability norms, are under development since 2008.The present approach, the work on which is well advanced, is however, not fully satisfactory and several important problems were discovered. This approach may need to be reconsidered or supplemented. The author in the paper presented discusses the weak points of the current approach and proposes possible different approach in order to make future ships safer from the stability point of view.
Źródło:
Polish Maritime Research; 2018, S 1; 56-62
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polynomial stability of evolution operators in Banach spaces
Autorzy:
Megan, M.
Ceausu, T.
Ramneantu, M. L.
Powiązania:
https://bibliotekanauki.pl/articles/254941.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
evolution operator
polynomial stability
exponential stability
Opis:
The paper considers three concepts of polynomial stability for linear evolution operators which are defined in a general Banach space and whose norms can increase not faster than exponentially. Our approach is based on the extension of techniques for exponential stability to the case of polynomial stability. Some illustrating examples clarify the relations between the stability concepts considered in paper. The obtained results are generalizations of well-known theorems about the uniform and nonuniform exponential stability.
Źródło:
Opuscula Mathematica; 2011, 31, 2; 279-288
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
STABILIZACJA MAKROEKONOMICZNA NA BIAŁORUSI W LATACH 2005-2014
MACRECONOMIC STABILITY IN BELARUS IN THE YEARS 2005-2014
Autorzy:
PILARCZYK, Daria
Powiązania:
https://bibliotekanauki.pl/articles/909433.pdf
Data publikacji:
2019-06-27
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
macroeconomic stability
Belarus
macroeconomic stability pentagon
Opis:
The economic policy of modern countries pays particular attention to the issue of macroeconomic stability which ensure sustainable growth and competitiveness. The article focuses on the situation in Belarusian economy from 2005 to 2014 in the context of macroeconomic stability. For research purposes, the author uses the method of the macroeconomic stability pentagon.
Źródło:
Historia@Teoria; 2018, 1, 7; 175-188
2450-8047
Pojawia się w:
Historia@Teoria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A necessary and sufficient condition for sigma-Hurwitz stability of the convex combination of the polynomials
Autorzy:
Białas, S.
Powiązania:
https://bibliotekanauki.pl/articles/255228.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
convex sets of polynomials
stability of polynomial
Hurwitz stability
sigma-stability
Opis:
In the paper are given a necessary and sufficent condition for sigma-Hurwitz stability of the convex combination of the polynomials.
Źródło:
Opuscula Mathematica; 2005, 25, 2; 165-168
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of natural systems - theory and practice
Autorzy:
Gerlée, Alina
Powiązania:
https://bibliotekanauki.pl/articles/1943891.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
stability of geoekosystems
definition of stability
idea of numerous states of stability
Opis:
The article discusses definitions and origin of the term “stability”. A difference is made between the stability of systems and their equilibrium. Practical and theoretical application of the term and limitations of its application are presented. The idea of numerous states of stability and consequences related to its application in nature conservation are discussed.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2008, 13; 11-19
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability and economic freedom in the countries of Central and Eastern Europe: Quantitative analysis
Autorzy:
Karateev, Artem
Powiązania:
https://bibliotekanauki.pl/articles/1041595.pdf
Data publikacji:
2019-12-30
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
stability
political stability
economic freedom
data analysis
Opis:
Exploring the stability of states and political systems is of interest to scientists and politicians all around the world. One of the most important questions in this field is the question of the relationship between stability and freedom. This paper considers the relationship between economic freedom and stability with regards to the example of countries of Central and Eastern Europe. The study uses quantitative analysis and the operationalisation of economic freedom through the Index of Economic Freedom (IEF); furthermore, stability is studied through the Fragile States Index (FSI), and the Political Stability and Absence of Violence/Terrorism Index (PSI). The analysis reveals a strong correlation between economic freedom and stability. According to linear regression models obtained by the author, economic freedom has a strong impact on stability. Models show that most of the components of IEF increase stability, whilst some components decrease it. This means that the same factors affect economic freedom and stability in different ways. In particular, taxes have a very positive effect on stability. At the same it is obvious that taxes reduce economic freedom. This fact allows us to resolve the existing contradictions among politicians and scientists, who differently assess the impact of economic freedom on stability. It may be stated that whilst economic freedom has in general a strong positive effect on stability, it can also have a negative effect.
Źródło:
Eastern Review; 2019, 8; 149-159
1427-9657
2451-2567
Pojawia się w:
Eastern Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of epoxy methacrylate of (E)-1,3-bis(4-hydroxyphenyl)prop-2-en-1-one and its jute/glass composites
Autorzy:
Thanki, J. D.
Parsania, P. H.
Powiązania:
https://bibliotekanauki.pl/articles/1190152.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
epoxy methacrylate
thermal stability
composites
hydrolytic stability
Opis:
Epoxy methacrylate of (E)-1,3-bis(4-hydroxyphenyl)prop-2-en-1-one (EMC) has been synthesized by condensing 1 equivi. (318g) epoxy resin of (E)-1,3-bis(4-hydroxyphenyl)prop-2-en-1-one and 2.1 equivi. (181g) methacrylic acid using 10 ml triethyl amine as a catalyst, 2.5 g hydroquinone as an inhibitor and 350 ml tetrahydrofuran as a solvent at reflux temperature for 1-7 h. Styrene was used as a reactive diluent. The structure of EMC was supported by FTIR and 1H NMR techniques. EMC showed endothermic transition at 118 °C and 307 °C, respectively due to melting and crosslinking followed by decomposition reaction and EMCS showed endothermic transitions at 81 °C and 255 °C due to branched and uncrosslinked EMCS and some physical change. EMC and EMCS are thermally stable up to about 265 and 332, respectively. EMC followed two steps degradation kinetics, while EMCS followed single step degradation kinetics. Jute and glass composites of EMCS were fabricated by hand lay-up technique followed by compression molding under 20 bar pressure and at 120 °C for 4 h. J-EMCS and G-EMCS showed 22.7 and 182 MPa tensile strength; 10.9 and 156.5 MPa flexural strength; 3.1 and 1.6 kV mm-1 electric strength; and 2.2 x 1012 and 2.8 x 1011 Ohm cm volume resistivity. Both J-EMCS and G-EMCS showed excellent hydrolytic stability even in harsh acidic and saline environments and also in boiling water. Observed equilibrium water content at 35 °C for J-EMCS and G-EMCS in water, 10% of aq. NaCl, and 10% of aq. HCl are 8.8, 10.8, and 8.7% ; 5.8, 4.6, and 4.7%, respectively. The composites may be useful for low load bearing housing units, and in electrical, electronic and marine fields.
Źródło:
World Scientific News; 2016, 42; 182-196
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exponential stability of nonlinear non-autonomous multivariable systems
Autorzy:
Gil', Michael
Powiązania:
https://bibliotekanauki.pl/articles/729507.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
nonlinear nonautonomous systems
exponential stability
absolute stability
Opis:
We consider nonlinear non-autonomous multivariable systems governed by differential equations with differentiable linear parts. Explicit conditions for the exponential stability are established. These conditions are formulated in terms of the norms of the derivatives and eigenvalues of the variable matrices, and certain scalar functions characterizing the nonlinearity. Moreover, an estimate for the solutions is derived. It gives us a bound for the region of attraction of the steady state. As a particular case we obtain absolute stability conditions.
Our approach is based on a combined usage of the properties of the "frozen" Lyapunov equation, and recent norm estimates for matrix functions. An illustrative example is given.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2015, 35, 1; 89-100
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Concept of Ship Stability Criteria Based on Cargo Shift Caused by Rolling Due to Gust
Koncepcja kryterium oceny stateczności na podstawie przesuwania się ładunku spowodowanego kołysaniem się statku pod wpływem szkwału
Autorzy:
Szozda, Z.
Powiązania:
https://bibliotekanauki.pl/articles/359928.pdf
Data publikacji:
2004
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
stateczność
ocena stateczności
kryteria stateczności
EXPLO-SHIP 2004
stability
stability assessment
stability criteria
Opis:
At present, intact ship stability criteria have prescriptive nature. At the 45-th Session of SLF Sub-Committee a decision was made to change IMO attitude concerning intact ship stability from prescriptive rules to performance based rules. This paper aims at providing a basic framework for the development of intact ship stability criteria based on a deterministic scenarios concept. The concept is described in general and one simple scenario is calculated in detail. This scenario concerns shifting of a deck cargo.
Obecnie kryteria oceny stateczności statku nie uszkodzonego oparte są na przepisach wynikających ze statystyki wypadków. Na 45. sesji Podkomitetu ds. Stateczności i Linii Ładunkowych podjęto decyzję o zmianie podejścia IMO do oceny stateczności na podejście uwzględniające zjawiska towarzyszące kołysaniom statków. Niniejszy artykuł przedstawia ideę opracowania kryteriów oceny stateczności na podstawie tzw. "scenariuszy". Opisano ogólne założenia oraz przedstawiono obliczenia dla wybranego scenariusza zakładającego przesunięcie się ładunku na pokładzie.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2004, 2 (74); 347-358
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Need of the Revision of Passenger Ships’ Stability Criterion on Account of Turning
Autorzy:
Szozda, Z.
Powiązania:
https://bibliotekanauki.pl/articles/116177.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Ship Stability
Passanger Ship
Turning of Ship
Passanger Ship's Stability
Stability Criteria
Passanger Ship's Stability Criterion
International Code on Intact Stability
Ship’s Heel
Opis:
The angle of heel on account of turning is one of the mandatory stability criteria for passenger ships. Formula used for calculations of this criterion contained in the International Code on Intact Stability [13] is criticized at present. Agendas of the Sub-committee on Ship Design and Construction (SDC) for the first (2014) and the second (2015) sessions contain the item on revision of this criterion and corresponding regulation. The paper presents some shortcomings of the criterion. Turning tests of a freely maneuvering model of a passenger ship have been executed aiming at gathering data for the future discussion and its facilitation. The paper presents results of the tests together with preliminary conclusions that confirm the need of the revision of the regulation and put forward concerns on application of such values as initial metacentric height (GMo) and righting lever curve (GZ(?)) calculated for a ship laying still for calculation of a ship’s heel caused by turn.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 393-399
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Thevenins equivalent model at the receiving node
Określanie modelu ekwiwalentu thevenina w węźle odbiorczym
Autorzy:
Brusiłowicz, B.
Szafran, J.
Powiązania:
https://bibliotekanauki.pl/articles/410567.pdf
Data publikacji:
2011
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Thevenin 's equivalent
stability margin
local voltage stability
Opis:
This paper presents the properties of the equivalent Thevenin's model of a network as seen from a network receiving node. Such a simplified model can be applied in protective and preventive gear installed at the considered receiving node. Thevenin's circuit can be determined either from of the power system configuration diagram or by use of algorithm based on local current and voltage phas or measurements. Local measurements are used to calculate the derivative of apparent power against the voltage dS/dV. Paper describes the dS/dV algorithm accuracy tests according to the approximate angle of the series system impedance. An important problem of the Thevenin's model updating due to the changing configuration of power system is discussed in the paper. The advantages and disadvanges of both described methods are also presented.
Artykuł przedstawia właściwości modelu Thevenina. Uproszczony model reprezentujący aktualną konfigurację systemu może mieć zastosowanie w automatyce zabezpieczeniowej oraz prewencyjnej montowanej w punkcie odbiorczym. Model Thevenina może być tworzony przy użyciu dwóch metod: korzystając z informacji o pełnej konfiguracji systemu oraz z algorytmu wyliczającego parametry modelu na podstawie pomiarów lokalnych fazorów napięć i prądów. Korzystając z pomiarów lokalnych, wyliczana jest pochodna mocy pozornej po napięciu &S/&V. Przeprowadzono testy dokładności algorytmu dS/dV w zależności od założonego kąta impedancji systemowej. Ważnym problemem, jaki jest poruszony w artykule jest aktualizacja modelu zgodnie ze zmieniającą się konfiguracją systemu elektroenergetycznego. Zmiany mogą być wywoływane zarówno stanami normalnej pracy, jak i awariami występującymi w systemie. Przedstawiono wady i zalety stosowania obu metod.
Źródło:
Present Problems of Power System Control; 2011, 1; 5-13
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the chemical stability of diesel oil with using Turbiscan Stability Index (TSI)
Autorzy:
Bukrejewski, Paweł
Jarczewski, Zbigniew
Matuszewska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/263433.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
diesel oil
oxidation stability
TSI
Turbiscan Stability Index
Opis:
For diesel oils containing fatty acid methyl esters (FAME), an important problem is their susceptibility to oxidation processes as this shortens the maximum storage time of such fuels and may result in deterioration of oil properties and thus affect the engine operation. One of the fuel ageing processes is the formation and release of resins from the fuel. The physical stability of mixtures may be evaluated by means of a physical stability index, determined with using a Turbiscan analyser [3, 19, 20]. The authors attempted to explore the possibility of using this index for evaluating the changes that take place during the ageing of diesel oil. Additionally, the impact of the presence of selected metals on the fuel ageing process was examined. Within the research, diesel oil samples containing various metals were prepared and subjected to the ageing process. Spectrophotometric tests were also carried out with using a Turbiscan instrument [4, 10, 11]. The samples were subjected to oxidation stability tests before and after the ageing process. The physical stability index and, additionally, the oxidation stability of the samples were examined by accelerated ageing methods.
Źródło:
Archiwum Motoryzacji; 2020, 88, 2; 5-18
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A methodology of identification of the aircraft translational dynamic stability derivatives in water tunnel experiments
Autorzy:
Lichoń, D.
Powiązania:
https://bibliotekanauki.pl/articles/243656.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aircraft dynamic stability
dynamic stability derivatives
water tunnel
Opis:
The aircraft dynamic stability derivatives (DSD) describe the variation of aerodynamics forces and moments with respect to disturbances of kinematic parameters (translational or rotational). The knowledge of DSD is important due to determination of aircraft dynamic stability characteristics. Thus, the identification of DSD is an issue of analytical or numerical analysis and experimental researches. Experimental methods use air or water tunnel tests. The investigated model is submitted to forced oscillations with relatively low amplitude, which simulates the disturbances around steady state flight parameters. The variation of forces and moments are measured by strain balance system, which allows identifying DSD. This work is focused on development the methodology of experimental identification the aircraft translational DSD in water tunnel tests. Study of available publications shows that model manipulator system usually provides rotational movements around three axes. Therefore, the measurements can be performed with respect to rotational velocity disturbances. However, by addition the translational manipulator with one degree of freedom the measurements can be expanded into translational velocity disturbances (normal and sideslip). It is necessary to point that axial velocity disturbance is omitted due to lack of axial force component in strain balance construction. The proposed modification does not affect the construction of rotational manipulator or balance. The article contains translational manipulator scheme, modification of data acquisition system and mathematical process of identification the aircraft translational dynamic stability derivatives.
Źródło:
Journal of KONES; 2016, 23, 4; 291-296
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Floatability and stability of floating dock-docked ship system
Autorzy:
Stasiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/260300.pdf
Data publikacji:
2005
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
floating dock
docked object
floatability
stability
stability factor
Opis:
An analysis of floatability and stability of the floating dock- docked ship system is the subject of this paper. These properties are considered for a cubicoid box dock whose dimensions are close ( almost identical) to those of SINE 212 CD dock designed by SINUS design office. The analysis is first of all aimed at determination of the above mentioned hydromechanical properties in the light of the relevant requirements of PRS dealing with minimum freeboard of the dock and its initial metacentric height. It has been concluded that the analyzed dock reveals the designed docking capability which is not constrained by the PRS requirements though the dock in question is fitted with the roofing unfavourable for dock stability. It has been shown that assessing the tranverse stability of the dock as well as of docked ship ( floating object) by means of a stability factor instead of metacentric height, is reasonable. The work was performed within the frame of EUREKA – E! 2968 ECOLOGICAL DOCK research project.
Źródło:
Polish Maritime Research; 2005, S 1; 39-45
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sample calculations using a draft method for assessment of the vulnerability to pure loss of stability of a fishing vessel
Autorzy:
Chorab, P.
Powiązania:
https://bibliotekanauki.pl/articles/360501.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
stability of a fishing vessel
stability-related safety
MAXSURF software
pure loss of stability
Opis:
The paper presents sample calculations concerning the assessment of the vulnerability to pure loss of stability of a fishing vessel. Calculations were performed for level 1 and level 2 of the method under consideration. In the summary the author discusses the results of calculations. The paper describes the results method for assessment of the stability criteria for a fishing vessel. Calculations were performed by software MAXSURF after the implementation of the algorithm. The result of the calculation are measure the phenomenon criteria of pure loss of stability of a fishing vessel.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 40 (112); 39-46
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the ρ-Edge Stability Number of Graphs
Autorzy:
Kemnitz, Arnfried
Marangio, Massimiliano
Powiązania:
https://bibliotekanauki.pl/articles/32361738.pdf
Data publikacji:
2022-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
edge stability number
line stability
invariant
chromatic edge stability index
chromatic index
edge coloring
Opis:
For an arbitrary invariant $ \rho(G) $ of a graph $G$ the $ \rho $-edge stability number $ es_\rho (G) $ is the minimum number of edges of $G$ whose removal results in a graph $ H \subseteq G $ with $ \rho (H) \ne \rho (G) $ or with $ E(H) = \emptyset $. In the first part of this paper we give some general lower and upper bounds for the $ \rho $-edge stability number. In the second part we study the $ \chi^' $-edge stability number of graphs, where $ \chi^' = \chi^' (G) $ is the chromatic index of $G$. We prove some general results for the so-called chromatic edge stability index $ es_{ \chi^′ } (G) $ and determine $ es_{ \chi^′ } (G) $ exactly for specific classes of graphs.
Źródło:
Discussiones Mathematicae Graph Theory; 2022, 42, 1; 249-262
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Slope stability analysis of waste dump in Sandstone Open Pit Osielec
Autorzy:
Adamczyk, J.
Cała, M.
Flisiak, J.
Kolano, M.
Kowalski, M.
Powiązania:
https://bibliotekanauki.pl/articles/178646.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
slope stability
waste dump
stability analysis
stability calculation
stateczność zbocza
wysypisko
analiza stateczności
obliczenia stateczności
Opis:
This paper presents the slope stability analysis for the current as well as projected (final) geometry of waste dump Sandstone Open Pit “Osielec”. For the stability analysis six sections were selected. Then, the final geometry of the waste dump was designed and the stability analysis was conducted. On the basis of the analysis results the opportunities to improve the stability of the object were identified. The next issue addressed in the paper was to determine the proportion of the mixture containing mining and processing wastes, for which the waste dump remains stable. Stability calculations were carried out using Janbu method, which belongs to the limit equilibrium methods.
Źródło:
Studia Geotechnica et Mechanica; 2013, 35, 1; 3-18
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Schur stability of the convex combination of complex polynomials
Autorzy:
Białas, S.
Białas, M.
Powiązania:
https://bibliotekanauki.pl/articles/969833.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Schur stability
robust stability
convex combination of the polynomials
Opis:
This paper gives a necessary and sufficient condition for Schur stability of the convex combination of complex polynomials. It is a generalization of the work by Ackerman and Barmish (1988).
Źródło:
Control and Cybernetics; 2010, 39, 2; 551-558
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Voltage stability in low voltage microgrids in aspects of active and reactive power demand
Autorzy:
Parol, M.
Rokicki, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/140350.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
distributed generation
microgrids
voltage stability
voltage stability margin
indexes
Opis:
Low voltage microgrids are autonomous subsystems, in which generation, storage and power and electrical energy consumption appear. In the paper the main attention has been paid to the voltage stability issue in low voltage microgrid for different variants of its operation. In the introduction a notion of microgrid has been presented, and also the issue of influence of active and reactive power balance on node voltage level has been described. Then description of voltage stability issue has been presented. The conditions of voltage stability and indicators used to determine voltage stability margin in the microgrid have been described. Description of the low voltage test microgrid, as well as research methodology along with definition of considered variants of its operation have been presented further. The results of exemplary calculations carried out for the daily changes in node load of the active and reactive power, i.e. the voltage and the voltage stability margin indexes in nodes have been presented. Furthermore, the changes of voltage stability margin indexes depending on the variant of the microgrid operation have been presented. Summary and formulation of conclusions related to the issue of voltage stability in microgrids have been included at the end of the paper.
Źródło:
Archives of Electrical Engineering; 2016, 65, 1; 19-32
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple analytic conditions for stability of fractional discrete-time linear systems with diagonal state matrix
Autorzy:
Busłowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/201685.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
linear system
discrete-time
fractional
practical stability
asymptotic stability
Opis:
In the paper the problems of practical stability and asymptotic stability of fractional discrete-time linear systems with a diagonal state matrix are addressed. Standard and positive systems are considered. Simple necessary and sufficient analytic conditions for practical stability and for asymptotic stability are established. The considerations are illustrated by numerical examples.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 809-814
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soil physical properties affected by biochar addition at different plant phaenological phases. Part I
Autorzy:
Horel, A.
Barna, G.
Mako, A.
Powiązania:
https://bibliotekanauki.pl/articles/2082508.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
structural stability
macro- and microaggregate stability
laser diffraction method
Opis:
Soil amendment usage can substantially modify soil structural and hydraulic properties, with the aim of improving its water, air and nutrition management along with crop growth. The purpose of the present study was to investigate the physical changes in soil through different plant growing stages caused by biochar addition to silt loam soil. This research focused on changes in structural stability, and macro- and microaggregate stability. The soils were amended with different amounts of biochar (control with 0, BC0.5 with 0.5%, BC2.5 with 2.5%, and BC5.0 with 5.0% biochar, by weight). Capsicum annuum L. were planted at a two-four leaf stage. Soil samples were taken at 6, 10 and 12 weeks after planting. The results showed increasing macroaggregate stability values with increasing biochar addition; however, higher values were also detectable in control treatments over time. Increased microaggregate stability values were observed during the plant maturing phase and the decrease, which occurred during fruit development was more pronounced. The largest microaggregate stability value was observed in the case of BC2.5 among all treatments, which corresponded better to plant growth rather than to the amount of added biochar. It was also found that the laser diffraction method is a suitable alternative technique to the sieve-pipette method for analysing biochar and biochar-amended soil particle size distribution and structure.
Źródło:
International Agrophysics; 2019, 33, 2; 255-262
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Necessary and sufficient conditions for stability of fractional discrete-time linear state-space systems
Autorzy:
Busłowicz, M.
Ruszewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/201743.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
linear system
discrete-time
fractional
practical stability
asymptotic stability
Opis:
In the paper the problems of practical stability and asymptotic stability of fractional discrete-time linear systems are addressed. Necessary and sufficient conditions for practical stability and for asymptotic stability are established. The conditions are given in terms of eigenvalues of the state matrix of the system. In particular, it is shown that (similarly as in the case of fractional continuous-time linear systems) in the complex plane exists such a region, that location of all eigenvalues of the state matrix in this region is necessary and sufficient for asymptotic stability. The parametric description of boundary of this region is given. Moreover, it is shown that Schur stability of the state matrix (all eigenvalues have absolute values less than 1) is not necessary nor sufficient for asymptotic stability of the fractional discrete-time system. The considerations are illustrated by numerical examples.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 779-786
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal design of compressed columns with corrosion taken into account
Autorzy:
Fridman, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/279948.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
corrosion
optimization
stability
Opis:
This study is devoted to the optimal design of compressed columns with a circular cross section under axial compressive forces and exposed to a corrosive environment. The initial volume of the structure is taken as an optimality parameter. The main constraint is the buckling of a loaded column at the final time of its operation. Gutman-Zaynullin’s exponential stress corrosion model is adopted for the analysis. Analytical and numerical results are derived for optimal variation of the cross-sectional area of the bar along its axis.
Źródło:
Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 129-137
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioactivity and stability studies of POM/HAp nanocomposites
Autorzy:
Pielichowska, K.
Stodolak, E.
Powiązania:
https://bibliotekanauki.pl/articles/286002.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanocomposites
bioactivity
stability
Źródło:
Engineering of Biomaterials; 2010, 13, no. 99-101; 1-2
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the stability for pancyclicity
Autorzy:
Schiermeyer, Ingo
Powiązania:
https://bibliotekanauki.pl/articles/743483.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
pancyclic graphs
stability
Opis:
A property P defined on all graphs of order n is said to be k-stable if for any graph of order n that does not satisfy P, the fact that uv is not an edge of G and that G + uv satisfies P implies $d_G(u) + d_G(v) < k$. Every property is (2n-3)-stable and every k-stable property is (k+1)-stable. We denote by s(P) the smallest integer k such that P is k-stable and call it the stability of P. This number usually depends on n and is at most 2n-3. A graph of order n is said to be pancyclic if it contains cycles of all lengths from 3 to n. We show that the stability s(P) for the graph property "G is pancyclic" satisfies max(⎡6n/5]⎤-5, n+t) ≤ s(P) ≤ max(⎡4n/3]⎤-2,n+t), where t = 2⎡(n+1)/2]⎤-(n+1).
Źródło:
Discussiones Mathematicae Graph Theory; 2001, 21, 2; 223-228
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On stability of some lexicographic integer optimization problem
Autorzy:
Emelichev, V. A.
Gurevsky, E. E.
Kuzmin, K. G.
Powiązania:
https://bibliotekanauki.pl/articles/969909.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
multicriteria optimization
lexicographic integer optimization problem
absolute values of linear functions
lexicographic optima
stability
strong stability
quasi-stability
strong quasi-stability
unalterability
Opis:
A lexicographic integer optimization problem with criteria represented by absolute values of linear functions is considered. Five types of stability for the set of lexicographic optima under small changes of the parameters of the vector criterion are investigated.
Źródło:
Control and Cybernetics; 2010, 39, 3; 811-826
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The stability study of a plane engine
Autorzy:
Kołodziej, Rafał
Nowicki, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1208216.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
dynamical system
stability
Opis:
We study the dynamical properties of a plane engine vibrations modelled by a system of ODE.
Źródło:
Applicationes Mathematicae; 2000, 27, 1; 35-44
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A lower bound on the independence number of a graph in terms of degrees
Autorzy:
Harant, Jochen
Schiermeyer, Ingo
Powiązania:
https://bibliotekanauki.pl/articles/743603.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
independence
stability
algorithm
Opis:
For a connected and non-complete graph, a new lower bound on its independence number is proved. It is shown that this bound is realizable by the well known efficient algorithm MIN.
Źródło:
Discussiones Mathematicae Graph Theory; 2006, 26, 3; 431-437
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of technetium in the moderate oxidation states in acidic media
Autorzy:
Chotkowski, Maciej
Czerwiński, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/764044.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
technetium, stability, spectroelectrochemistry
Opis:
Technetium is one of the most important radionuclides in the spent nuclear fuel in context of reprocessing, storage and long term disposal. Spectroelectrochemical studies on the redox behavior of this element are presented and possible pathways of pertechnetate ions reduction are discussed. The stability of technetium (III/IV) species are discussed.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2016, 71, 1
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Qualitative stability analysis of multicriteria combinatorial minimin problems
Autorzy:
Emelichev, V. A.
Karelkina, O. V.
Kuzmin, K. G.
Powiązania:
https://bibliotekanauki.pl/articles/206273.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
combinatorial optimization
Pareto set
lexicographic set
stability analysis
stability types
Opis:
A multicriteria combinatorial problem with minimin partial criteria is considered. Necessary and sufficient conditions for the five known stability types of the problem are obtained. These stability types describe in different ways the behavior of the Pareto and lexicographic sets of the problem under initial data perturba- tions of the vector criteria.
Źródło:
Control and Cybernetics; 2012, 41, 1; 57-79
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of soil acidification on the formation of Fe-, Al-, and Mn-oxides and the stability of soil aggregates
Autorzy:
Rampazzo, N.
Schwertmann, U.
Blum, W.E.H.
Mentler, A.
Powiązania:
https://bibliotekanauki.pl/articles/24830.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
formation
stability
soil
soil acidification
soil aggregate
aggregate stability
oxide
Źródło:
International Agrophysics; 1999, 13, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple conditions for robust stability of positive discrete-time linear systems with delays
Autorzy:
Busłowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/970235.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
stability
robust stability
linear system
delays
linear uncertainty
interval system
Opis:
The paper is devoted to the problem of robust stability of positive linear discrete-time systems with delays in the case of structured perturbations of state matrices. Simple new necessary and sufficient conditions for robust stability in the general case and in the case of system with linear uncertainty structure are established for two sub-cases: 1) unity rank uncertainty structure, 2) non-negative perturbation matrices. It is shown that robust stability of the positive discrete-time linear system with delays is equivalent to: 1) robust stability of the corresponding positive system without delays of the same order as time-delay system - in the general case, 2) asymptotic stability of finite family of the positive vertex systems without delays - in the case of a linear unity rank uncertainty structure, 3) asymptotic stability of only one positive vertex system without delays - in the case of a linear uncertainty structure with non-negative perturbation matrices.
Źródło:
Control and Cybernetics; 2010, 39, 4; 1159-1171
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Practical and asymptotic stability of fractional discrete-time scalar systems described by a new model
Autorzy:
Ruszewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/229234.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
asymptotic stability
practical stability
fractional order
discrete-time linear system
Opis:
The stability problems of fractional discrete-time linear scalar systems described by the new model are considered. Using the classical D-partition method, the necessary and sufficient conditions for practical stability and asymptotic stability are given. The considerations are il-lustrated by numerical examples.
Źródło:
Archives of Control Sciences; 2016, 26, 4; 441-452
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mean-square non-local stability of ship in storm conditions of operation
Autorzy:
Nekrasov, Valeriy
Powiązania:
https://bibliotekanauki.pl/articles/260117.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
wind-waves mode
local and nonlocal stability
nonlocal stability in mean
nonlocal stability in mean square
reliability indicator
Opis:
The purpose of the paper is to create a method for studying nonlocal stability in the mean and in the mean square of the ship, positioned on the beam of an intensive wind–waves mode, which is based on the use of the correlation theory of random functions close to continuous Markov processes. With the help of this method and the integral formula of event probability, a method for determining the reliability indicator of the ship in respect of the existing wind–waves excitations of the operating area is formed. An example of investigating the nonlinear motion of the ship, determining its local and nonlocal stability in the first approximation of the theory of considered random functions, is given. Such approximation uses correlation theory with models of acting excitations represented by the generalised derivatives of the Wiener process. Moreover, special attention is paid to reflecting the connection of the proposed methods for investigating the ship stability under constantly acting random excitations with the traditional methods of studying ship stability at small and large inclinations. The established connection defines the proposed methods as a development of the traditional methods of ship stability deterministic theory during the transition to its formation in the class of random functions, with the addition to these methods of the missing link of determining the level of reliability of ships towards the acting wind–waves excitations of the operation area.
Źródło:
Polish Maritime Research; 2019, 4; 6-15
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evaluation of stability of Czech and Slovak banks
Autorzy:
Kocisova, Kristina
Gavurova, Beata
Behun, Marcel
Powiązania:
https://bibliotekanauki.pl/articles/18808325.pdf
Data publikacji:
2018
Wydawca:
Instytut Badań Gospodarczych
Tematy:
commercial banks
stability
banking stability index
Z-score
Czech Republic
Slovakia
Opis:
Research background: Commercial banks could affect the stability of the whole banking system due to the way they carry out their business activities. The supervision authorities play a key role in protecting banking stability by ensuring banks´ resilience to shocks, ability to recover their position in response to crisis and ultimately the supervision authorities help prevent failure of these banks. Therefore, in recent years' researchers have been trying to define conditions that could guarantee stability of banks. Purpose of the article: This paper aims to describe the methodology used to measure banking stability, namely banking stability index (BSI) and Z-score. In the first part, we present the literature review, then we try to assess the stability in the condition of the Czech Republic and Slovakia during the period 2006-2016. Methods: The BSI is constructed according to the methodology presented by Ghosh (2011), taking into account the main components, which are described by the set of financial indicators of banks. Findings & Value added: Results showed that the average BSI in the whole sample moved from 0.20454 (in 2015) to 0.2486 (in 2007). The results according to countries have showed that the tendency of development in the Czech and Slovak banking sector was the same. At the beginning of the analyzed period, the Slovak banks were more stable compared to Czech ones. Since 2009 the situation has been different, where the Czech banks could be considered as more stable compared to Slovak ones. The tendency of development of Z-score in both countries could be considered as the same, without the 2009 year, when the Czech banks significantly strengthened their capitalization, which influenced the development of Z-score. The results of correlation analysis between Z-score and BSI pointed to the fact that there was no high correlation between these two measures, therefore it is appropriate to use both methodologies for stability evaluation.
Źródło:
Oeconomia Copernicana; 2018, 9, 2; 205-223
2083-1277
Pojawia się w:
Oeconomia Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
HVDC auxiliary emergency power control strategy for power disturbance in two different positions of AC/DC interconnection system
Autorzy:
Li, Congshan
He, Ping
Wang, Youyi
Ji, Yuyi
Yang, Cunxiang
Powiązania:
https://bibliotekanauki.pl/articles/141502.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
unbalanced power
emergency control
power angle stability
frequency stability
control logic
Opis:
High voltage direct current (HVDC) emergency control can significantly improve the transient stability of an AC/DC interconnected power grid, and is an important measure to reduce the amount of generator and load shedding when the system fails. For the AC/DC interconnected power grid, according to the location of failure, disturbances can be classified into two categories: 1) interconnected system tie-line faults, which will cause the power unbalance at both ends of the AC system, as a result of the generator rotor acceleration at the sending-end grid and the generator rotor deceleration at the receiving-end grid; 2) AC system internal faults, due to the isolation effect of the DC system, only the rotor of the generator in the disturbed area changes, which has little impact on the other end of the grid. In view of the above two different locations of disturbance, auxiliary power and frequency combination control as well as a switch strategy, are proposed in this paper. A four-machine two-area transmission system and a multi-machine AC/DC parallel transmission system were built on the PSCAD platform. The simulation results verify the effectiveness of the proposed control strategy.
Źródło:
Archives of Electrical Engineering; 2019, 68, 2; 245-263
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of the convex combination of polynomials
Autorzy:
Góra, M.
Powiązania:
https://bibliotekanauki.pl/articles/970377.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Hurwitz stability
Schur stability
roots of polynomials
convex combination of polynomials
Opis:
In this paper, we consider the convex combination of polynomials. We provide a necessary and sufficient condition for Hurwitz stability of the convex combination of m real polynomials (m ≥ 3) whose degrees may be different and both necessary, and necessary and sufficient conditions for Hurwitz and Schur stability of the convex combination of two complex polynomials. We show also that the convex combination of two polynomials whose degrees are respectively odd and even, is never Schur stable. We give a few examples completing the results.
Źródło:
Control and Cybernetics; 2007, 36, 2; 425-442
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of general stability calculation for flood embankment body and foundation
Autorzy:
Asani, A.
Powiązania:
https://bibliotekanauki.pl/articles/396611.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
stateczność nasypu
obliczanie stateczności
wał przeciwpowodziowy
embankment stability
calculation of stability
Opis:
The paper presents the methods of general stability calculations for the body and foundation of the flood embankment and their applicability.
Źródło:
Civil and Environmental Engineering Reports; 2009, 3; 5-14
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the PHREEQC program to assess the chemical stability of tap water in Kielce
Zastosowanie programu PHREEQC do oceny stabilności chemicznej wody wodociągowej w Kielcach
Autorzy:
Metryka-Telka, Monika
Kowalik, Robert
Gawdzik, Jarosław
Gawdzik, Barbara
Gawdzik, Alicja
Powiązania:
https://bibliotekanauki.pl/articles/402211.pdf
Data publikacji:
2020
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
PHREEQC
water chemical stability
stability index
stabilność chemiczna wody
wskaźnik stabilności
Opis:
The research was conducted on samples of water in Kielce from two intakes: Białogon and Zagnańsk. The results of selected indicators for these waters were presented, among others, the most important ones influencing its chemical stability i.e. calcium or magnesium. Then, using the PHREEQC program, stability indices were calculated for water in Kielce from the two shots in question. In the next stage, the correctness of the water test method was checked by means of a program through the ionic balance of the water and comparison of pH of the water determined with the value determined by calculation. For the above mentioned activities, tables and calculations were prepared on the basis of which appropriate conclusions were made.
Badania przeprowadzono na próbkach wody w Kielcach pochodzące z dwóch ujęć: Białogon i Zagnańsk. Przedstawiono wyniki wybranych wskaźników dla tych wód, m.in. najważniejszych wpływających na ich stabilność chemiczną, tj. wapnia lub magnezu. Następnie, za pomocą programu PHREEQC, obliczono wskaźniki stabilności dla wód w Kielcach z dwóch ujęć, o których mowa. W kolejnym etapie sprawdzono poprawność metody badania wody za pomocą programu poprzez bilans jonowy wody i porównanie pH wyznaczonej wody z wartością wyznaczoną w wyniku obliczeń. Dla wyżej wymienionych czynności przygotowano tabele i obliczenia, na podstawie których wyciągnięto odpowiednie wnioski.
Źródło:
Structure and Environment; 2020, 12, 1; 41-45
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Case studies on Q-slope method use for slope stability analyses
Autorzy:
Komurlu, Eren
Powiązania:
https://bibliotekanauki.pl/articles/2172883.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
slope stability
rock mass stability
empirical method
rock engineering
Q-slope
Opis:
The use of the Q-slope value is a relatively new approach for the stability investigations of rock slopes. In this study, four different slopes in Giresun and Ordu cities of Turkey were investigated to assess whether the Q-slope approach is usable for varying slope heights, or not. A back analysis was carried out for a landslide in a case study quarry located in Kovanlik municipality of Giresun city. Carrying out detailed investigations on the geotechnical drill cores and the field studies, the Q-slope value of the rock mass of the Kovanlik quarry was determined as 0.58. According to the Q-slope approach, the slope which had a landslide under the case of 49° general slope angle and 225 m height should have been stable at a general slope angle of 59°. It has been found that the Q-slope approach is not favorable for a high slope with the height of 225 m. Two roadway excavations with steep slope angles and low heights smaller than 25 m were also investigated within this study. According to the Q-slope value, the roadway slopes which are stable for more than 3 years are estimated to be unstable. Therefore, the Q-slope approach was found also misleading for slopes with low heights like those under 25 m. On the other hand, the Q-slope method usability is confirmed obtaining parallel results with the observations from another case study slope with a height of 78 m. Although it has become a popular empirical method in the recent years, it is recommended to revise the Q-slope approach or limit its use depending on the slope height parameter.
Źródło:
Studia Geotechnica et Mechanica; 2022, 44, 3; 190--197
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of Computing Open Pit Slopes Stability of Complicated-Structure Deposits
Autorzy:
Ozhigin, S.
Ozhigina, S.
Ozhigin, D.
Powiązania:
https://bibliotekanauki.pl/articles/319041.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
open pits
slopes
stability
Opis:
In substantiation of the parameters of stable open pit slopes of complicated-structure deposits it is necessary to take into account a number of natural and anthropogenic conditions of the open pit side masses, such as: lithological heterogenity, plicative and disjunctive tectonic broken state, rocks laminated structure, form of the open pit side, hydro-geological conditions of the deposit development, the mining-transport equipment loading effect, etc. In the article there is suggested a solution of this problem consisting in the improving of numerical-analytical method of professor P.S. Shpakov, whose advantage is the accounting if stresses acting on the elementary ground based on integrated effect of all the acting factors. The essence of the solution con-sists in the following: with a unified algorithm of realization (numerical solu-tion, iteration method) every time there is built a new analytical formula of the limit equilibrium corresponding to the concrete mining-technical and mining-geological conditions permitting to establish the mechanism of the possible de-forming of open pit slopes.
Źródło:
Inżynieria Mineralna; 2018, R. 19, nr 1, 1; 203-208
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial synchronization of unbalanced rotors excited with paralleled and counterrotating motors in a far resonance system
Autorzy:
Fang, Pan
Zou, Min
Peng, Huan
Du, Mingjun
Hu, Gang
Hou, Yongjun
Powiązania:
https://bibliotekanauki.pl/articles/279402.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
synchronization
rotors
dynamics
stability
Opis:
Dynamic characteristics of the vibration screening machinery is influenced by synchronization between induction motors. Therefore, estimating the synchronous state between the motors is a crucial process for designing the vibration screening machinery. In this paper, two rotors excited with paralleled and counterrotating motors in a far resonance system are concerned. To master the synchronization of the system, the dynamic model is firstly established; then, the synchronous condition of the system is derived with the Poincar´e method; subsequently, the synchronous stability of the system is discussed by the Hamilton principle; finally, some computation simulations are implemented to verify correctness of theoretical analysis. The research result shows that the system actuated by rotors of the identical mass is planar motion as the stable phase difference between the rotors is stabilized in the zero phase. The system actuated by nonequivalent mass rotors exhibits spatial motion as the stable phase difference stabilizes in a nonzero phase.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 723-738
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a certain model of uniperiodic medium thickness olates subjected to initial stresses
Pewien model wstępnie napiętych uniperidycznych płyt średniej grubości
Autorzy:
Baron, E.
Powiązania:
https://bibliotekanauki.pl/articles/279615.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
uniperiodic plates
modelling
stability
Opis:
The aim of the paper is twofold. First, governing equations for medium thickness elastic plates which have a periodically non-homogeneous structure in one direction (uniperiodic) and subjected to initial in-plane stresses are derived. In order to obtain the aforementioned equations, the tolerance averaging technique is applied. This technique leads to equations with constant coefficients. Second, the above equations are applied to analysis of certain stabiliry and dynamic problems. The stiffnesses of plates were calculated by treating them as structurally anisotrpic. An interesting results is that two values of the critical force can be obtained. This results can have a physical meaning for the stability of plates under compression in one direction and tension in the perpendicular direction.
Celem pracy jest rozszerzenie i pewne uogólnienie dwuwymiarowego modelu średniej grubości (typu Reissnera) sprężystych płyt o jednokierunkowej strukturze periodycznej zaproponowanego przez Barona (2000). Zastosowano metodę uśredniania tolerancyjnego opisanego np. przez Woźniaka i Wierzbickiego (2000). Metoda ta pozwala uwzględnić wpływ wymiaru powtarzalnego segmentu płyty (okresu powtarzalności) na jej makromechaniczne własności, czyli tzw. efekt skali. Uzyskane ogólne równania przekształcono do postaci dogodnej do analizy płyt technicznie anizotropowych. Przeprowadzono analizę zagadnienia drgań swobodnych oraz stateczności płyt stalowo-betonowych stosowanych w budownictwie. Uzyskano dodatkową relację do obliczania sił krytycznych.
Źródło:
Journal of Theoretical and Applied Mechanics; 2005, 43, 1; 93-110
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-linear stability problem of spherical shell loaded with torque
Nieliniowe zagadnienie stateczności powłoki kulistej obciążonej momentem obrotowym
Autorzy:
Joniak, S.
Powiązania:
https://bibliotekanauki.pl/articles/280457.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
shells
non-linear stability
Opis:
A thin-walled spherical shell is pivoted at both edges. One of the edges may rotate around the shell axis. Moreover, it is loaded with a torque. The problem of shell stability is considered. The system of equations characterizing the problem consists of a non-linear equation of equilibrium and non-linear compatibility equation. Both equations are solved with Bubnov-Galerkin's method, assuming beforehand the form of deflection and force-functions. As a result of the solution, an algebraic equation is obtained, with respect to a dimensionless load parameter. The critical load parameter corresponding to the minimal critical load value is determined from this equation. The number m at which the load parameter has the minimum value determines the mode of stability loss. The paper is supplied with a numerical example.
Cienkościenna powłoka kulista jest podparta przegubowo na obu brzegach. Jeden z brzegów ma możliwość obrotu wokół osi powłoki; do tego brzegu przyłożony jest moment obrotowy.Rozpatruje się zagadnieniestateczności powłoki. Układ równań zagadnienia tworzą nieliniowe równanie równowagi oraz nieliniowe równanie nierozdzielności. Oba równania rozwiązuje się metodą Bubnowa-Galerkina, przyjmując uprzednio postać funkcji ugięcia i funkcji sił. Efektem rozwiązania jest równanie algebraiczne na bezwymiarowy parametr obciążenia. Z tego równania wyznacza się parametr obciążenia krytycznego, odpowiadający minimalnej jego wartości. Liczba m, przy której parametr obciążenia osiąga minimum wyznacza postać utraty stateczności. Praca kończy się przykładem liczbowym.
Źródło:
Journal of Theoretical and Applied Mechanics; 2003, 41, 3; 537-544
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remarks on the stability of some quadratic functional equations
Autorzy:
Kominek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/255399.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
quadratic functional equations
stability
Opis:
Stability problems concerning the functional equations of the form f(2x + y) = 4ƒ(x) + ƒ(y) + ƒ(x + y) - ƒ(x - y), and ƒ(2x + y) + ƒ(2x -y) = 8ƒ(x) + 2ƒ(y) are investigated. We prove that if the norm of the difference between the LHS and the RHS of one of equations (1) or (2), calculated for a function g is say, dominated by a function φ in two variables having some standard properties then there exists a unique solution ƒ of this equation and the norm of the difference between g and ƒ is controlled by a function depending on φ.
Źródło:
Opuscula Mathematica; 2008, 28, 4; 517-527
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Thermal and Magnetic Properties of Amorphous Fe61Co10Zr2.5Hf2.5Me2W2B20 (Where Me = Mo, Nb, Ni Or Y) Ribbons
Autorzy:
Gruszka, K.
Nabiałek, M.
Szota, M.
Bloch, K.
Gondro, J.
Pietrusiewicz, P.
Sandu, A. V.
Mustafa Al Bakri, A. M.
Walters, K.
Walters, S.
Garus, S.
Dośpiał, M.
Mizera, J.
Powiązania:
https://bibliotekanauki.pl/articles/355886.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal stability
magnetic properties
Opis:
The paper presents the results of structural and magnetic properties and thermal stability for a group of functional materials based on Fe61Co10Zr2.5Hf2.5Me2W2B20 (where Me = Mo, Nb, Ni or Y). Samples were obtained in the form of ribbons using melt-spinning method. The X-ray diffraction patterns of investigated samples confirmed their amorphous structure. Based on the analysis of DSC curves characteristic temperatures: glass forming temperature (Tg), crystallization temperature (Tx) and temperature range of the supercooled liquid ΔTx were determined. Small addition of transition metals elements has strong influence on magnetic and thermal parameters of studied materials. The comprehensive studies revealed that in terms of magnetic properties the Ni-addition resulted in highest reduction in coercivity and anisotropy field.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 641-644
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of hospital rankings
Autorzy:
SIELSKA, Agata
Powiązania:
https://bibliotekanauki.pl/articles/1181946.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
rankings
stability
hospital
TOPSIS
Opis:
Many hospital rankings are based on algorithms and weights elicited by experts. The paper attempts to build rankings of Polish district hospitals using the TOPSIS method and to examine the sensitivity of the results to the changes in weights. We considered 11 large and 34 medium-sized hospitals. The criteria set consists of man-days total, profit/loss on sales, contract with the National Health Fund, return on assets (ROA) and return on equity (ROE). Because of this, rankings consider different spheres in which hospitals perform, including the financial aspect and their main goal, i.e., treating patients. The results show that despite the overall high similarity of rankings, the benchmarking based on rankings should be done with care as the positions of some individual hospitals changed to a great degree.
Źródło:
Operations Research and Decisions; 2020, 30, 4; 95-112
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Absolute instability of double annular jets: local stability analysis
Autorzy:
Boguslawski, A.
Wawrzak, K.
Powiązania:
https://bibliotekanauki.pl/articles/38627039.pdf
Data publikacji:
2021
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
stability analysis
annular jets
Opis:
The paper presents the local linear stability analysis of the double annular jets. The calculations show that the first absolutely unstable helical mode can be generated in the non-swirling annular jets by the back-flow in the central recirculation zone or sufficiently strong back-flow in the external recirculation zone. The influence of the back-flow magnitude on the frequency, growth rate and eigenfunctions of the first helical mode is discussed. The calculations are completed with an analysis of the influence of the swirl intensity in the internal and external jets on the characteristics of the first absolutely unstable helical mode.
Źródło:
Archives of Mechanics; 2021, 73, 3; 267-300
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The stability of Markov operators on Polish spaces
Autorzy:
Szarek, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1205807.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
asymptotic stability
Markov operators
Opis:
A sufficient condition for the asymptotic stability of Markov operators acting on measures defined on Polish spaces is presented.
Źródło:
Studia Mathematica; 2000, 143, 2; 145-152
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Buckling behaviour of single-walled carbon nanotubes under axial loading
Autorzy:
Litak, G.
Powiązania:
https://bibliotekanauki.pl/articles/102773.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
carbon nanotubes
buckling
stability
Opis:
We investigate the behaviour of a single-walled Carbon Nanotube under axial compressive line load applied at both edges. The expected buckling response is studied by application of a molecular computation model. We formulate a global potential and search for its minimum to obtain the equilibrium configuration. The critical nanotube diameter, when local shell buckling occurs, is measured with two parameters: the value of compression loading and tube diameter.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 1; 208-211
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability and chaotic properties of multidimensional Lasota equation
Autorzy:
Dawidowicz, A. L.
Poskrobko, A.
Powiązania:
https://bibliotekanauki.pl/articles/205622.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Lasota equation
chaos
stability
Opis:
In this paper we study asymptotic properties of multidimensional Lasota equation. We give the conditions of its stability and chaos in the sense of Devaney in Orlicz spaces Lp for any p > 0. We also give criteria when the semigroup generated by the equation has not asymptotic behaviour.
Źródło:
Control and Cybernetics; 2013, 42, 2; 387-397
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer analysis of electromotoric swivel walker movement
Autorzy:
Varga, J.
Hajduk, M.
Świć, A.
Powiązania:
https://bibliotekanauki.pl/articles/117705.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
swivel walker
stability
trajectory
Opis:
The first mechanical construction of swivel walker is from year 1963 and it was aimed for support movement of people with disabilities. This solution was very difficult and it was main reason for purpose of electromotoric module, which facilitates movement and reduce effort of people with disabilities. Therefore further research in this area are still provided. In this paper trajectory of swivel walker with electromotoric modules is described. To analyze the tilt and trajectory structure of the walker SolidWorks software was implemented.
Źródło:
Applied Computer Science; 2016, 12, 4; 88-95
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of stability of the human gait
Analiza stabilności chodu człowieka
Autorzy:
Mrozowski, J.
Awrejcewicz, J.
Bamberski, P.
Powiązania:
https://bibliotekanauki.pl/articles/280814.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
human gait
stability criteria
Opis:
Analysis of the gait stability of a man moving along an even surface with a constant velocity is presented. The stability criteria applied to biped robots, namely: the Zero Moment Point (ZMP) and the Ground projection of the Center Of Mass (GCOM) have been employed in the investigations. The analysis has been carried out on the basis of measurement data obtained from the human gait recorded wit h a digital camera.
Artykuł przedstawia analizę stabilności chodu człowieka poruszającego się po równej poziomej powierzchni. W badaniach wykorzystano dwa kryteria stateczności: ZMP (Zero Moment Point) i GCOM (Ground projection of the Center Of Mass) stosowane w odniesieniu do robotów dwunożnych. Analizę przeprowadzono na podstawie zarejestrowanych za pomocą kamer cyfrowych danych dotyczących trajektorii wybranych punktów.
Źródło:
Journal of Theoretical and Applied Mechanics; 2007, 45, 1; 91-98
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energetic method of solving the stability problem of a semispherical shell loaded with torque
Metoda energetyczna rozwiązania problemu stateczności powłoki półkolistej obciążonej momentem obrotowym
Autorzy:
Joniak, S.
Powiązania:
https://bibliotekanauki.pl/articles/282011.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
shells
non-linear stability
Opis:
A thin-walled spherical shell is pivoted at both ends. The upper edge of the shell, loaded with a torque, may rotate around the shell axis. The problem of the loss of stability of the shell is solved with an energetic method. The change in the total energy of the shell while losing stability is determined. This requires the forms of the deflection and force functions to be assumed, according to actual boundary conditions. Coefficients of the force function are determined from the solution to the inseparability equation with the Bubnov-Galerkin method. The stability equation of the shell is formulated as a results of application of the Ritz method to the total energy variation. It is an algebraic equation serving for determination of the critical load. It is equal to the minimal value of the load. The work ends with a numerical example.
Cienkościenna powłoka półkulista jest podparta przegubowo na obu brzegach. Górny brzeg powłoki ma możliwość obrotu wokół osi powłoki; do tego brzegu przyłożony jest moment obrotowy. Rozpatrywany jest problem utraty stateczności tej powłoki metodą energetyczną. Wyznacza się zmianę energii całkowitej powłoki podczas utraty stateczności. Wymaga to przyjęcia postaci funkcji ugięcia po utracie stateczności i funkcji sił odpowiednich do warunków brzegowych. Współczynniki funkcji sił wyznacza się z rozwiązania równania nierozdzielności metodą Bubnowa-Galerkina. Równanie utraty stateczności powstaje po zastosowaniu do całkowitej zmiany energii metodą Ritza. Jest to równanie algebraiczne, z którego wyznacza się obciążenie krytyczne; odpowiada ona minimalnej wartości parametru obciążenia.
Źródło:
Journal of Theoretical and Applied Mechanics; 2004, 42, 2; 349-356
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Articulated engineering equipment stability simulations based on Ł34 wheel loader
Autorzy:
Konopka, S.
Krogul, P.
Łopatka, M. J.
Muszyński, T.
Powiązania:
https://bibliotekanauki.pl/articles/244572.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
modelling
MSC ADAMS
stability
Opis:
This paper presents dynamic stability simulation tests of the Ł34 dynamic loader. The simulations were run according to military standards of United States of America. Tested loader had to overcome two obstacles at a first gear velocity. The first obstacle were pothole, while second one were rut. The current obstacles were crossed by Ł34 loader with two configurations. The first of them were loader in transport configuration, whereas second one were loader with maximum lift height of the bucket. The crossing of the rut was performed only by the loader in transport configuration, whereas passing of the pothole was performed by the loader in both configurations. The two obstacles also were crossed by loader with a nominal load and without it. This paper also defines effects of the modification of loader with more stiffer and more flexible tyres. There were also consider effects of the modification of Ł34 loader with integrated articulation.
Źródło:
Journal of KONES; 2011, 18, 1; 273-280
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of free-floating ship. Part I
Autorzy:
Pawłowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/259241.pdf
Data publikacji:
2005
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
stability
free floating ship
Opis:
Problem of calculation of righting arms of the free-floating ship, i.e. longitudinally balanced at any heel angle, was formulated. In such a case of particular interest for a ship in the damage condition, the righting arms are ambiguous as they depend on a way the heeling moment acts. Two cases were considered: when the heeling moment is parallel to the ship plane of symmetry, and the case when it performs the least work, i.e. when the moment is parallel to the main axis of ship waterplane. It was demonstrated that angular translations (heel and trim) are then the Euler angles associated with a relevant reference axis. Some cases of the incorrect defining and using of those angles in today design practice were indicated. The most important features of the curve of righting arms of free-floating ship were demonstrated.
Źródło:
Polish Maritime Research; 2005, 2; 3-9
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of free-floating ship. Part II
Autorzy:
Pawłowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/259551.pdf
Data publikacji:
2005
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
stability
free floating ship
Opis:
This is the second part of the paper published in Polish Maritime Research no. 2/2005, dealing with the calculation problem of righting arms of the free-floating ship, i.e. longitudinally balanced at any heel angle. In such case the righting arms are ambiguous as they depend on a way the heeling moment acts. Two cases were considered: when the heeling moment is parallel to the ship plane of symmetry, and the case when it performs the least work, i.e. when the moment is parallel to the main axis of ship waterline. It was demonstrated that angular translations (heel and trim) are then the Euler angles associated with a relevant reference axis. Some cases of the incorrect defining and using of those angles in today design practice were indicated. The most important features of the curve of righting arms of free-floating ship were demonstrated.
Źródło:
Polish Maritime Research; 2005, 3; 3-8
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On testing the hypothesis of stability of the ratio of two random variables.
O testowaniu hipotezy o stabilności wartości oczekiwanej ilorazu dwóch zmiennych losowych
Autorzy:
Kończak, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/907022.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
ratio
testing stability
autoregression
Opis:
The problem of testing the hypothesis of the stability of expected value of the ratio of random variables is considered in the article. The ratio of random variables X and Y under assumptions of the autoregression models is analyzed. A test which makes it possible to verify the mentioned hypothesis is proposed. The problem being considered in the article appears in the statistical quality control when the proportions of dimensions of the product or the proportion of components in mixtures are required to be stable.
W artykule zaprezentowano propozycję testu pozwalającego na weryfikację hipotezy o stabilności wartości oczekiwanej ilorazu zmiennych losowych. W rozważaniach przyjęto, że w kolejnych n okresach czasowych dokonywane są pomiary wartości zmiennych losowych Y i X. Przedmiotem analizy jest iloraz zmiennych losowych Z = Y/Х przy założeniu modelu autoregresji. Problem przedstawiony w artykule jest spotykany w zagadnieniach statystycznej kontroli jakości, gdy niezbędne jest zachowanie odpowiedniej proporcji np. dla wymiarów produktu czy proporcji składników w mieszaninach.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2008, 216
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On asymptotically periodic-like motions in flows
Autorzy:
Gryszka, Karol
Powiązania:
https://bibliotekanauki.pl/articles/744640.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
periodicity
asymptotic periodicity
stability
Źródło:
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica; 2018, 17
2300-133X
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Political risk on financial markets in developed and developing economies
Autorzy:
Waszkiewicz, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/522248.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
International finance
Stability
Threat
Opis:
Aim/purpose – We want to draw academics and market practitioners attention to threats form political risk’s area that affect national financial markets in both developed and developing economies. Design/methodology/approach – We analyzed the wide concept of political risk on the basis of international literature as well as national statistical data and international comparative indicants for selected developed and developing economies around the world. Findings – Growing significance of political risk was signaled, although both types of economies are exposed to different aspects of the threat. We confirmed that developing states are threatened by bigger number of political bothers, whereas advanced countries are susceptible to some forms of violence. Research implications/limitations – Imply that economies with better economic stance have lower level of political risk, although, their highly developed and integrated financial markets are responsible for the transfer of analyzed risk. Unfortunately, the scarcity of reliable time series about political risk hampered a deeper empirical analysis. Originality/value/contribution – Presentation of political threats to financial market stability.
Źródło:
Journal of Economics and Management; 2017, 28; 112-132
1732-1948
Pojawia się w:
Journal of Economics and Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Funding of Banks in Resolution
Autorzy:
Dżuryk, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/485386.pdf
Data publikacji:
2018-09-13
Wydawca:
Bankowy Fundusz Gwarancyjny
Tematy:
financial stability
financial stability board
resolution
BRRD
funding in resolution
G-SIB
Opis:
The article presents the outcome of the research executed by the author, which formed the position of the European Financial Congress (EFC) in relation to the Financial Stability Board’s consultative document on Funding Strategy Elements of an Implementable Resolution Plan. The position, was based on the opinions of stakeholders of Polish financial market, represented by banks, regulatory bodies, law firms and the academia. The consultative document set out proposed guidance on the development of a plan for funding banks in resolution. The research revealed a wide array of challenges in the development of firm capabilities to facilitate the execution of the funding strategy in resolution. Additional issues were raised regarding relevant aspects for estimating liquidity needs in resolution process. There were indicated numerous obstacles to the mobilisation of assets that could be used as collateral for particularly private sector backstop sources of funding. All those blocking points could be removed by public sector support funding, subject to certain conditions. Moreover, there are a number of actions that could be taken by G-SIBs and authorities to support the development and implementation of resolution funding and there are also some other aspects of funding strategy which shall be also considered.
Źródło:
Bezpieczny Bank; 2018, 2 (71); 126-136
1429-2939
Pojawia się w:
Bezpieczny Bank
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The differences between overground and treadmill walking in nonlinear, entropy-based and frequency variables derived from accelerometers in young and older women : preliminary report
Autorzy:
Bizovska, L.
Svoboda, Z.
Kubonova, E.
Vuillerme, N.
Hirjakova, Z.
Janura, M.
Powiązania:
https://bibliotekanauki.pl/articles/307504.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
starzenie
chód
stabilność
stateczność dynamiczna
ageing
gait
stability
variability
local dynamic stability
Opis:
The aim of this study was to compare gait stability and variability between walking conditions and age groups. Methods: Twenty-six healthy younger and older females participated. Trunk acceleration in the vertical (V), medial-lateral (ML) and anteriorposterior (AP) directions during 5 minutes walking overground and 3 minutes walking on the treadmill at self-selected speed were recorded. Root mean square and standard deviations of acceleration, stride time and its variability, Lyapunov exponents (LE), multiscale entropy (MSE) and harmonic ratios (HR) were computed. Results: Both age groups showed significantly higher stride time variability and short-term LE in all directions during overground walking. For the older group, overground walking showed higher V and AP standard deviation. Significantly lower values for overground walking were observed for long-term LE (V and ML for the younger group, ML for the older group), HR (ML for the older group) and MSE (V for the older group). Significant age-related differences were found for V long-term LE for overground walking. Conclusions: The present findings suggest that both linear and advanced computational techniques for gait stability and variability assessment in older adults are sensitive to walking conditions.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 1; 93-100
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power System Transient Stability Case Study: A Power Sub-Station Plant in Sudan
Autorzy:
Abbas, Asma
Kamal, Ramadan Doud
Elmustafa, Sayed Ali Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/1193487.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dynamic Stability
GARRI power stations
Swing Equation
Transient Stability
power angle
synchronism
Opis:
Power system stability is defined by the tendency of the energy system to develop recovery forces equal or greater than the disturbing forces to maintain a stable equilibrium state. In general, power system stability problems are usually divided into two parts, steady state and transient state. An extension of steady-state stability is dynamic stability. Transient stability deals with the effects of large disturbances such as malfunctions, sudden line interruptions, and sudden application or load removal. This research is presents load angle method to transient stability problem for multi-machine system. The ETAP program is used to simulate the above method to study transient stability. A sub-station plant in Khartoum (GARRI) with four generation sections (1, 2 and 4) has been taken as a case study. The simulation result shows that when a single line-ground fault occurs at main busbar and cleared at time t = 0.4 sec the system is stable, in case 2, when the same fault cleared at t = 3 sec the system become unstable.
Źródło:
World Scientific News; 2021, 158; 267-284
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of the Stabilities and Intracellular Antioxidant Activities of Lavender Essential Oil by Metal-Organic Frameworks Based on β-Cyclodextrin and Potassium Cation
Autorzy:
Wang, Ying
Wang, Liang
Tan, Jin
Li, Rong
Jiang, Zi-Tao
Tang, Shu-Hua
Powiązania:
https://bibliotekanauki.pl/articles/1363277.pdf
Data publikacji:
2021
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
microcapsulation
thermal stability
pH stability
cell viability
cellular antioxidant model
application extension
Opis:
Lavender (Lavandula angustifolia) is an important medicinal and aromatic plant. However, the application of lavender essential oil (LEO) is limited by its instability, low solubility and high volatility. Therefore, to improve the stabilities and antioxidant activities of LEO and thereby expand the applications, LEO was microencapsulated by metal-organic frameworks based on β-cyclodextrin and potassium cation (K-βCD-MOFs) with different mass core/wall ratios. The results showed that the best inclusion rate was 96.67% with the ratio of 1:10. Then, the optimum inclusion product was characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). The thermal and pH stabilities and the intracellular antioxidant activities were also studied. The results showed that the stabilities of the oil with K-βCD-MOFs inclusions and their abilities to resist acid and alkali were significantly stronger than those of LEO itself. In addition, the intracellular antioxidant activities of LEO were also enhanced by the K-βCD-MOFs inclusion. These results suggested the potential of K-βCD-MOFs as carriers for essential oils in food industry applications.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2021, 71, 1; 39-50
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revised model of social change and acceleration: the case of Iranian society in the 1960s and 1970s
Autorzy:
Poornik, Hassan
Powiązania:
https://bibliotekanauki.pl/articles/2118954.pdf
Data publikacji:
2022-08-23
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
: social acceleration
social stability and change
stability through dynam-
ization
Iranian society
Opis:
This article aims to address the processes of social changes in terms of the theory of social acceleration. It begins with an outline of the theory of social acceleration and discusses how an investigation into the driving forces of social acceleration can be used to explain the dynamics of social stability and change. It criticizes the acceleration theory because its focus is merely on high-industrialized western societies as well as the neglect of normative and religious aspects in the processes of social acceleration and change. This article proposes a revised model of social acceleration and applies it to Iranian society. It identifies the main features of acceleration-cycle formed in Iranian society in the 1960s and 1970s to answer the question of why the cycle of acceleration could not establish a self-propelling acceleratory formation as a prime requirement for preserving social stability.
Źródło:
Society Register; 2022, 6, 3; 109-126
2544-5502
Pojawia się w:
Society Register
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A sufficient condition for Hurwitz stability of the convex combination of two matrices
Autorzy:
Białas, S.
Powiązania:
https://bibliotekanauki.pl/articles/970417.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
stabilność Hurwitza
convex sets of matrices
stability of matrix sets
Hurwitz stability
Opis:
The paper provides a simple sufficient condition for Hurwitz stability of the convex combination of two real matrices.
Źródło:
Control and Cybernetics; 2004, 33, 1; 109-112
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stabilność finansowa a stabilność makroekonomiczna na przykładzie polskiej gospodarki
Financial stability vs. macroeconomic stability on the example of Polish economy
Autorzy:
Urbanowicz, Zuzanna
Powiązania:
https://bibliotekanauki.pl/articles/580899.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
stabilność finansowa
stabilność makroekonomiczna
analiza wielowymiarowa
financial stability
macroeconomic stability
multidimensional analysis
Opis:
Celem artykułu jest analiza, na przykładzie Polski, związku między stabilnością finansową a makroekonomiczną. Opracowanie ma teoretyczno-empiryczny charakter. Najpierw omówiono definicje i metody pomiaru stabilności finansowej i makroekonomicznej. Następnie przedstawiono przedmiot, zakres czasowy badania i metodę badawczą. W ostatniej części zawarto wyniki analizy relacji między stabilnością finansową a makroekonomiczną. Analiza literatury doprowadziła do wniosku o braku jednorodności w definiowaniu oraz mierzeniu obu rodzajów stabilności. Warto podkreślić, że o ile w definiowaniu stabilności finansowej podkreśla się jej istotną rolę w kształtowaniu stabilności gospodarczej, to na poziomie definicji stabilności makroekonomicznej kwestia stabilności systemu finansowego jest często pomijana. Przeprowadzone badanie nie potwierdziło istnienia wpływu sytuacji systemu finansowego na stabilność makroekonomiczną, natomiast został potwierdzony związek odwrotny, tzn. stan koniunktury gospodarczej przekłada się na stabilność systemu finansowego.
The aim of the article is to analyze the relationship between financial and macroeconomic stability in the Polish economy. The article has a theoretical and empirical character. In the first part the definitions and the methods of measuring the financial and macroeconomic stability are described. Then the subject, time range of the conducted research are presented, as well as the applied research method. The results of an empirical analysis of the bilateral relationship between financial and macroeconomic stability are contained at the end of the article. The conducted analysis of the literature leads to a conclusion that there is no uniformity in defining and measuring financial and macroeconomic stability. The conducted research confirms the existence of impact of the economic situation on the stability of the Polish financial system, while the reverse relationship, the impact of the situation in the financial system on the macroeconomic stability of Poland, has not been confirmed.
Źródło:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2018, 529; 369-380
1899-3192
Pojawia się w:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Postural stability in Parkinson’s disease patients
Autorzy:
Wilczyński, J.
Pedrycz, A.
Zieliński, E.
Ambroży, T.
Mucha, D.
Powiązania:
https://bibliotekanauki.pl/articles/306998.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
stabilność posturalna
choroba Parkinsona
test stabilności
postural stability
Parkinson's disease
Postural Stability Test
Opis:
Purpose: The aim of the study was to analyze postural stability in Parkinson's disease patients. A total of 32 subjects were tested, including 26 (81.25%) women and 6 (18.75%) men. These were patients with advanced, idiopathic Parkinson’s disease. The disease duration was over 5 years. Methods: The study was conducted in the Posturology Laboratory at the Department of Medicine and Health Sciences, Jan Kochanowski University in Kielce (Poland). The Biodex Balance System was used for evaluation of postural stability. Postural Stability Testing was performed with both feet positioned on a stable surface with the eyes open. Results: The Overall Stability Index in the whole group was 0.5°. The higher Overall Stability Index in women is indicative of slightly worse postural stability compared to men, although in both groups, it was within norms (Z = 2.0545, p = 0.0399). Anterior-Posterior Overall Stability Index (A/P) was an average of 0.35°. The Medial-Lateral Overall Stability Index (M/L) was an average of 0.27°. Both women and men were observed to have higher postural sway in the sagittal plane than the frontal plane. The vast majority of the subjects maintained in Zone A during testing (99.94%), and was slightly bent backwards to the right and in Quadrant IV (61.53%). Conclusions: Regular control of postural stability in Parkinson's disease patients is significant due to the risk of falls.
Źródło:
Acta of Bioengineering and Biomechanics; 2017, 19, 4; 135-141
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Postural stability of students of Pavol Jozef Safarik University
Stabilność postawy studentów Uniwersytetu im. Pavla Jozefa Safarika
Autorzy:
Kasko, D.
Powiązania:
https://bibliotekanauki.pl/articles/4764.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:
student
postural stability
Pavol Jozef Safarik University
movement pattern
torso stability
joint mobility
Opis:
The objective of this study was to determine the point values of movement patterns using the FMS™ method and to compare them amongst various groups of students of Pavol Jozef Šafárik University in Košice (UPJS). The group consisted of students of P.J. Šafárik University (n =30, 21 women and 9 men). The average body height was 170,1 cm, average age was 20,9 years of age, average body weight without distinguishing gender was 65,8 kg and average BMI was 22,6. FMS™ testing was made up of 10 standard tests of which 7 tests had scores from 0 to 3 points. The presence of pain in predetermined movements was evaluated in three additional tests. The average overall score in the FMS™ test, evaluating the entire group regardless of gender, was 16.1 points. When comparing the results achieved in the tests amongst groups of subjects we demonstrated a statistically significant higher level in groups of men (FMSm=2,78) than in groups of women (FMSf=1,24; p≤0,01). When comparing the results between students of the “Sports and Health” area of study (FMSs=2,33) and other students of UPJS (FMSu=1,43), we demonstrated a statistically higher level in students of the sport field. Statistically significant differences between the studied groups were shown by analytical evaluation of scores achieved in each FMS system test. We have shown a higher statistically significant level in the average test score of the torso stability click test in the group of men (FMSm=2,78) than in the group of women (FMSf=1,24; p≤0,01; graph 1). We have also shown a statistically significant higher score in the torso stability click test in the student group SAR (FMSs=2,33) than in the group of students of other UPJS faculties (FMSu=1,43; p≤0,01 graph 1). We can conclude that our results are comparable with similar studies published abroad. Higher points of joint mobility and movement patterns of the lower extremities have been reported in females sample. For men, we observed a higher points value in the evaluation of trunk stability. Which we attributed to the development of muscles of the upper body of men as an expression of muskulinity contrary unhappiness with appearens in women (gynoid type) motivates to work on lower body. We contemplate that the above-mentioned reality influenced the point values of our sample. We are aware of the need for further research in this area with the aim of better understanding the factors underlying a given reality.
Celem niniejszego badania było określenie wartości punktowej wzorców ruchowych przy użyciu metody FMS™ i porównanie ich dla różnych grup studentów Uniwersytetu im. Pavla Jozefa Šafárika w Koszycach (UPJS). Grupa składała się ze studentów Uniwersytetu im. P.J. Šafárika (n=30, 21 kobiet i 9 mężczyzn). Średni wzrost wynosił 170,1 cm, średnia wieku wynosiła 20,9 lat, średnia waga bez podziału na płeć wynosiła 65,8 kg, a średni BMI wynosił 22,6. Testowanie FMS™ składało się z 10 standardowych testów, z których 7 miało punktację od 0 do 3 punktów. Obecność bólu przy zaplanowanych ruchach oceniano w trzech dodatkowych testach. Średni wynik ogólny w teście FMS™, oceniający całą grupę bez uwzględnienia płci, wyniósł 16,1 punktów. Porównanie wyników testów grup kierunkowych statystycznie pokazuje, że grupy męskie osiągnęły w nich wyższy poziom (FMSm=2,78) niż grupy żeńskie (FMSf=1,24; p≤0,01). Porównując wyniki studentów kierunku studiów sport i zdrowie (FMSs=2,33) z pozostałymi studentami UPJS (FMSu=1,43), zademonstrowaliśmy statystycznie wyższy poziom studentów kierunku sportowego. Statystycznie ważne różnice między badanymi grupami ukazano za pomocą analitycznej oceny wyników osiągniętych w każdym teście systemu FMS. Wykazaliśmy statystycznie wyższy, ważny poziom średniego wyniku testu stabilności tułowia w grupie mężczyzn (FMSm=2,78), niż w grupie kobiet (FMSf=1,24; p≤0,01). Pokazaliśmy również znacząco wyższy statystycznie wynik w teście stabilności tułowia w grupie studentów SAR (FMSs=2,33) od tego osiągniętego przez studentów innych wydziałów UPJS (FMSu=1,43; p≤0,01). Możemy zatem wnioskować, że nasze wyniki są porównywalne z wynikami podobnych badań publikowanych za granicą. U badanych grup żeńskich odnotowano wyższą punktację ruchliwości stawów i wzorców ruchowych kończyn dolnych. U mężczyzn zaobserwowaliśmy wyższe wartości punktowe przy ocenie stabilności tułowia, co przypisaliśmy pracy nad rozwojem mięśni górnej części ciała u mężczyzn jako oznace męskości w przeciwieństwie do niezadowolenia z takiego wyglądu u kobiet (typ kynoidalny), co motywuje do pracy nad dolnymi partiami ciała. Analizujemy możliwość wpływu wyżej wymienionego faktu na wartość punktową badanej przez nas grupy. Mamy świadomość potrzeby prowadzenia dalszych badań zmierzających do lepszego zrozumienia czynników leżących u podstawy danych realiów.
Źródło:
Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Kultura Fizyczna; 2016, 15, 3
1895-8680
Pojawia się w:
Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Kultura Fizyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust switched controller design for linear continuous-time systems
Autorzy:
Ilka, A.
Veselý, P.
Powiązania:
https://bibliotekanauki.pl/articles/229858.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
switched system
robust controller
output feedback
quadratic stability
multi parameter dependent quadratic stability
Opis:
In this paper we study a novel approach to the design of a robust switched controller for continuous-time systems described by a novel robust plant model using quadratic stability and multi parameter dependent quadratic stability approaches. In the proposed design procedure with an output feedback a novel quadratic cost function is proposed which allows to obtain different performance dependence on the working points. Finally a numerical examples are investigated.
Źródło:
Archives of Control Sciences; 2015, 25, 4; 401-416
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability analysis of the slope subjected to the dynamic loading
Autorzy:
Zabuski, Lesław
Powiązania:
https://bibliotekanauki.pl/articles/27311343.pdf
Data publikacji:
2023
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
slope stability
landslide
pseudo-static analysis stability
stabilność zbocza
osuwisko
analiza pseudostatyczna stateczności
Opis:
This paper presents the results of a stability analysis of a slope located in the immediate vicinity of a railway line. The plans for the extension of this railway track include the construction of another line, which would run parallel to the existing one, within a few metres distance. It is expected that intensive goods train traffic will generate both static and dynamic forces in the underlying subsoil. Consequently, seismic vibrations will be generated in the subsoil, propagating mainly not only in the horizontal direction but also in the vertical direction. The method of seismic coefficient of the earthquake intensity determined by a pseudo-static method and horizontal component of acceleration is appropriate and recommended because it is simple, and the safety factor of the slope is calculated in the same way as in conventional stability calculations.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 118; 243--255
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of initial geometrical imperfections in stability analysis of thin-walled structures
Modelowanie początkowych imperfekcji geometrycznych w zagadnieniach stateczności konstrukcji cienkościennych
Autorzy:
Rzeszut, K.
Garstecki, A.
Powiązania:
https://bibliotekanauki.pl/articles/279456.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
stability analysis
initial geometric imperfections
thin walled beams
stability of cold-formed bars
Opis:
Imperfections are modeled using actual values measured in situ. The method proposed in the paper is based on the concept of developing the imperfections in series of eigenmodes, using a limited number of most critical eigenmodes. Error minimization of this representation is performed. The method is applied to the nonlinear stability analysis of structures made of steel thin-walled cold-formed sigma profiles. FEM with shell elements and the Riks method are used. Numerical examples illustrate the influence of initial imperfections on post buckling behavior of structures.
W pracy przedstawiono metodę modelowania początkowych imperfekcji geometrycznych na podstawie rzeczywistych imperfekcji pomierzonych "in situ". Zaproponowana metoda polega na automatycznym tworzeniu sygnału imperfekcji w postaci serii funkcji własnych uzyskanych z liniowej analizy stateczności. Do modelowania imperfekcji użyto niewielkiej liczby najbardziej niekorzystnych postaci własnych. Efektywność metody analizowano ze względu na liczbę punktów pomiaru oraz sposób ich rozmieszczenia na długości pręta, minimalizując błąd aproksymacji. W dalszej części pracy, propopnowana metoda została zastosowana do nieliniowej analizy stateczności z uwzględnieniem imperfekcji prętów cienkościennych typu "Sigma". Do rozwiązania problemu nieliniowej analizy stateczności zastosowano metodę Riks'a. Przykłady numeryczne ilustrują wpływ początkowych imperfekcji geometrycznych na pokrytyczne zachowanie konstrukcji.
Źródło:
Journal of Theoretical and Applied Mechanics; 2009, 47, 3; 667-684
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A sufficient condition for Schur stability of the convex combination of the polynomials
Autorzy:
Białas, S.
Powiązania:
https://bibliotekanauki.pl/articles/255077.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
convex sets of polynomials
stability of polynomial sets
Schur stability
convex combination
polynomials
Opis:
In this paper is given a simple sufficient condition for Schur stability of the convex combination of the real polynomials.
Źródło:
Opuscula Mathematica; 2005, 25, 1; 25-28
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Notes Towards a Multifaceted Approach to Political Stability
Autorzy:
Carp, Radu
Perlikowski, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/42938776.pdf
Data publikacji:
2024-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
multifaceted approach to political stability
political stability
system analysis approach
asynchronism
political theory
Opis:
This paper seeks to improve comprehension of issues related to political stability. The primary elucidating tool employed is the multifaceted approach to political stability. This is the idea that similar political stability mechanisms can be observed in many different political contexts. These phenomena consist of conspicuous discrepancies between the stability of dimensions or layers of the political sphere. The lack of congruency between political stability and economic stability, differences between the stability of government authorities and the stability of the whole political system, or the gap between social and political stability are examples that are not difficult to grasp in ordinary observations of political appearances. The main task of this paper is to explain and elaborate on the reasons behind this phenomenon. As an additional value, some suggestions of how our findings can change the view on the method of research on political stability are to be found. The outcome of our investigation can be applied to comparative politics, constitutional studies, and political system analysis. The paper is particularly significant for empirically oriented political theory.
Źródło:
Polish Political Science Yearbook; 2024, 2(53); 5-14
0208-7375
Pojawia się w:
Polish Political Science Yearbook
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On asymptotic stability of a linear difference equation depending on parameters
Autorzy:
Przyłuski, M.
Powiązania:
https://bibliotekanauki.pl/articles/115517.pdf
Data publikacji:
2012
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
difference equation
asymptotic stability
optimisation
Opis:
The paper focuses on a linear diffrence equation depending on parameters. The equation is related to Good win’s theory of extrapolative expectations. The stability region of the equation is investigated. Conditions for asymptotic stability are formulated and presented as an optimisation problem, which is further analysed. Despite employing state-of-the-art solvers, numerical results have turned out to be too ambiguous to provide the basis for definite conclusions about the investigated stability region.
Źródło:
Challenges of Modern Technology; 2012, 3, 3; 11-14
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Post-buckling analysis of elastic-plastic plates basing on the Tsai-Wu Criterion
Autorzy:
Grądzki, R.
Kowal-Michalska, K.
Powiązania:
https://bibliotekanauki.pl/articles/279549.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nonlinear stability
elastic-plastic plates
Opis:
This work deals with the analysis of post-buckling state in rectangular plates subject to uniaxial in-plane compression within the elastic and elasto-plastic range. The problems of initial out-of-flatness and different geometry of rectangular plate are considered. The analysis is carried out on the basis of non-linear theory of plates involving plasticity. It is assumed that the yield values in tension and compression tests of a plate material are different. Thus, the Tsai-Wu Criterion is applied. The solution is obtained in the analytical-numerical way using the Prandtl-Reuss equations. As result of numerical calculations the load-shortening curves for the considered plates are obtained.
W pracy przeprowadzono analizę stanu zakrytycznego w obszarze sprężystym i sprężysto-plastycznym prostokątnych płyt poddanych ściskaniu. Rozważano płyty wstępnie wygięte, o różnej geometrii, wykonane z materiału o różnych wartościach granic plastyczności na ściskanie i rozciąganie. Badania prowadzono w oparciu o nieliniową teorię cienkich płyt z uwzględnieniem kryterium plastyczności Tsai-Wu. Rozwiązanie uzyskano na drodze analityczno-numerycznej stosując równania Prandtla-Reussa w postaci przyrostowej. Wyniki obliczeń numerycznych przedstawiono na wykresach.
Źródło:
Journal of Theoretical and Applied Mechanics; 1999, 4; 893-908
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of variable orthotropy upon the stability of thin-walled rectangular plates
Autorzy:
Kubiak, T.
Powiązania:
https://bibliotekanauki.pl/articles/279601.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
stability
thin-walled structures
orthotropy
Opis:
The author analyse the stability loss in thin-walled orthotropic plates, their principal directions of orthotropy being pararell to the wall edges, for plates with the orthotropy ratio, B=Ex/Ey varying widthwise. The analysis was carried out within the elastic range. Numerical tests were made on thin plates with the loaded edgessimply supported; unloaded edges were tested for different kinds of support (clamped, simply supported, free-edge). Plates were subject to loads causing uniform and linearly varying displacement of edges. The problem was solved using Koiter's first-order asymptotic theory of conservative systems stability (Koiter, 1963). Results of numerical calculations were presented as graphs describing the relationship between a critical value (force of moment) and the perameter defining defining orthotropy across the plate width.
W pracy analizowano utratę stateczności cienkościennych płyt ortotropowych o głównych kierunkach ortotropii równoległych do krawędzi ścian. Badano płyty charakteryzujące się zmiennym wzdłuż szerokości współczynnikiem ortotropii B=Ex/Ey. Analiza prowadzona była w zakresie sprężystym. Badano płyty cienkie podparte na obciążonych brzegach przegubowo, a na nie obciążonych brano pod uwagę różne rodzaje podparcia (utwierdzenie, podparcie przegubowe, swobodny brzeg). Płyty poddano obciążeniom powodującym równomierne i liniowo zmienne zbliżenie brzegów. Zagadnienie rozwiązano przy zastosowaniu pierwszego rzędu asymptotycznej teorii stateczności układów zachowawczych Koitera. Wyniki obliczeń numerycznych przedstawiono w postaci wykresów opisujących zależność wielkości krytycznej (siły lub momentu) od parametru określającego zmienność ortotropii wzdłuż szerokości płyty.
Źródło:
Journal of Theoretical and Applied Mechanics; 1999, 1; 129-145
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic behaviour of an axially moving thin orthotropic plate
Autorzy:
Marynowski, K.
Kołakowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/279611.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
moving plate
ortotropy
dynamic stability
Opis:
A new approach to analysis of the dynamic behaviour of axially moving orthopedic plates is presented. The nonlinear orthotropic plate theory is modified to include the inertial forces resulting from the moving web.The results of numerical investigations show the solution to a linear problem. The effects of the ortotropy factor, axial transport velocity and rolls support system on transverse and torsional natural frequencies and stability of the plate motion are presented. The lowest natural frequencies decrease with the increasing axial velocity at undercritical transport speeds. The plate may experience divergent or flutter instability at supercritical transport speeds. A second stable region above the critical speed may exist as well.
W pracy przedstawiono nową metodę analizy dynamicznej poruszających się osiowo płyt ortotropowych. Wyniki obliczeń numerycznych pokazują rozwiązanie problemu liniowego. Badano wpływ współczynnika ortotropii, prędkości osiowej oraz sztywności podparcia rolek na poprzeczne i skrętne częstości drgań własnych i stateczność ruchu płyty. Wartości najniższych częstości własnych zmniejszają się wraz ze wzrostem prędkości w podkrytycznym zakresie prędkości przesuwu. W zakresie nadkrytycznym może występować niestateczność dywergencyjna lub typu flater. W zakresie nadkrytycznym może się również pojawić drugi obszar stateczności ruchu.
Źródło:
Journal of Theoretical and Applied Mechanics; 1999, 1; 109-128
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On stability of thin periodically, densely stiffened cylindrical shells
Stateczność cienkich periodycznie gęsto użebrowanych powłok walcowych
Autorzy:
Tomczyk, B.
Powiązania:
https://bibliotekanauki.pl/articles/281254.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
shell
stiffeners
modelling
stability
cell
Opis:
The aim of this contribution is to propose a new averaged nonasymptotic model of stationary stability problems for thin linear-elastic cylindrical shells reinforced by stiffeners which are periodically, densely spaced along one direction tangent to the shell midsurface. As a tool of modelling we shall apply the tolerance averaging technique. The resulting equations have constant coefficients in the periodicity direction. Moreover, in contrast with models obtained by the asymptotic homogenization technique, the proposed one makes it possible to describe the effect of the periodicity cell size on the global shell stability (a length-scale effect). It will be shown that this effect plays an important role in the shell stability analysis and cannot be neglected.
W pracy zaproponowano nowy uśredniony nieasymptotyczny model służący do analizy stateczności cienkich liniowo-sprężystych powłok walcowych, periodycznie, gęsto użebrowanych w jednym kierunku stycznym do powierzchni środkowej. Przy wyprowadzaniu równań modelu wykorzystano znaną metodę tolerancyjnego uśredniania, zaproponowaną przez Woźniaka i Wierzbickiego (2000). Zastosowanie tej metody do znanych równań teorii powłok Kirchhoffa-Love'a doprowadziło do modelu reprezentowanego przez równania różniczkowe cząstkowe o stałych współczynnikach w kierunku periodyczności, zależnych od długościokresu periodyczności. Oznacza to, że proponowany model, w przeciwieństwie do znanych modeli zhomogenizowanych, umożliwia badanie wpływu wielkości komórki periodyczności na wartości sił krytycznych w powłoce walcowej (wpływ ten zwany jest efektem skali). Wyprowadzony model porównano z modelem bez efektu skali i pokazano, że wpływ długości okresu periodyczności odgrywa znaczącą rolę w zgadnieniach stateczności periodycznie, gęsto użebrowanych powłok walcowych.
Źródło:
Journal of Theoretical and Applied Mechanics; 2005, 43, 2; 427-455
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The unsteadiness of tip clearance flow and its effect to stability of transonic axial compressor
Nieustaloność przepływu w szczelinie wierzchołkowej i jej wpływ na stabilność pracy przydźwiękowej sprężarki osiowej
Autorzy:
Hu, J. F.
Zhu, X. C.
Ou-Yang, H.
Tian, J.
Wu, Y. D.
Qiang, X. Q.
Zhao, G.
Du, Z. H.
Powiązania:
https://bibliotekanauki.pl/articles/281445.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
tip leakage flow
compressor
stability
Opis:
The steady and unsteady RANS simulations of a transonic compressor rotor (NASA rotor 37) are performed to investigate the tip clearance flow characteristic and correlations between tip leakage flow and compressor stability. For steady simulations, the results are compared with the aerodynamic probe and laser anemometer data. The speed lines and span-wise aerodynamic parameters agree well with the experimental data. On the other hand, the tip clearance flow of unsteady simulations are analysed clearly at a near stall condition. The results show that there is a mass flow rate boundary. The tip clearance flow oscillates substantially with a frequency about 50% BPF when the mass is less than that, which is caused by tip clearance flow, shock, and the interaction between them and the oncoming flow. The interface between the oncoming flow and clearance flow shifts forward, and the tip clearance flow may spill over into the adjacent blade passage as the mass flow decreases, which may results in the spike stall inception.
W pracy przedstawiono symulacje stanu ustalonego i nieustalonego przydźwiękowej sprężarki osiowej (turbina NASA 37) z zastosowaniem metody Reynoldsa uśredniania równań Naviera-Stokesa (RANS) w celu zbadania charakterystyki przepływu w szczelinie wierzchołkowej oraz określenia zależności pomiędzy stratami związanymi z upływem w tej szczelinie a stabilnością pracy sprężarki. Wyniki symulacji stanu ustalonego porównano z danymi doświadczalnymi uzyskanymi za pomocą sondy aerodynamicznej i laserowego wiatromierza. Wyznaczone wzdłuż rozpiętości sprężarki linie prędkości przepływu i jego parametry aerodynamiczne okazały się zgodne z danymi doświadczalnymi. W przypadku symulacji stanu nieustalonego, analizę przepływu w szczelinie wierzchołkowej przeprowadzono dla warunków bliskich oderwania, tj. utraty wydajności sprężarki, wyznaczając graniczny wydatek przepływu dla takiej sytuacji. Poniżej tej granicznej wartości, zmiany przepływu w szczelinie oscylują z częstotliwością sięgającą 50% częstotliwości przejścia łopatek (tzw. BPF), co jest konsekwencją interakcji wywołanej zderzeniem przepływu z falą napływową w szczelinie wierzchołkowej. Powierzchnia tej interakcji przesuwa się do przodu, a sam przepływ może rozpaść się na fragmenty znajdujące ujście w kanałach przyległych łopatek. Zjawisko to zachodzi przy malejącym wydatku, a to z kolei może indukować oderwanie przepływu skokowymi zmianami mocy współpracującego silnika.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 2; 431-438
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Voltage stability estimation of receiving node using approximate model
Autorzy:
Brusilowicz, B
Szafran, J.
Powiązania:
https://bibliotekanauki.pl/articles/410585.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
voltage stability estimation
Thevenin equivalent
Opis:
The paper presents approximate model for determining the voltage stability margin. In the first part, Thevenin model and equations describing this model e.g. stability limit are presented. Influence of load and system impedance changes on variations of node voltage are shown. Second part consist description of approximate model determination methods. For the analysis, the 14-bus IEEE model have been chosen. Basing on this model the impact of configuration changes on the Thevenin parameters of considered receiving nodes have been analysed. At the end, the possibilities of use of approximate model for determining the voltage stability margin are described.
Źródło:
Present Problems of Power System Control; 2014, 5; 44-54
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trwałość pierwszych związków w kohortach urodzeniowych 1951-1960 oraz 1961-1970
Ability of first relationships for women from birth cohorts 1951–1960 and 1961–1970
Autorzy:
Borucka, Jadwiga
Romaniuk, Joanna
Frątczak, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/418312.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
demography
relationships stability
survival analysis
Opis:
A family, as the basic social unit has been a subject to statisticians' and demographists' research for many years. Recently, the marriage institution has changed not only regarding the age at which people marry and the number of children they have but also as concerns its stability. At the same time, alternative forms of family appeared, mostly cohabitations. Such a variety complicates analysis of functioning and stability of a family. It becomes even more complicated regarding the fact that cohabitation often precedes marriage thus it needs to be decided whether it should be analyzed independently or rather in relation to the marriage that comes next. However, increasing divorce rate as well as cohabitations which are more common lead to the question on the stability of marriages and informal relationships as well as other changes observed recently in this area. The main objective of the study is to analyze and compare the stability of first relationships for women from birth cohorts 1951-1960 and 1961-1970.Cohort analysis makes it possible to present the changes in marital stability that have been observed for women from demographic decline cohort (1961-1970) as compared to women from demographic bulge cohort (1951-1960). Analyzed data comes from the questionnaire D (Fertility in Poland) of the National Population and Housing Census 2002.
Źródło:
Studia Demograficzne; 2012, 161, 1; 103-127
0039-3134
Pojawia się w:
Studia Demograficzne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antioxidant effects of carotenoids in a model pigment-protein complex
Autorzy:
Fiedor, Joanna
Sulikowska, Aleksandra
Orzechowska, Aleksandra
Fiedor, Leszek
Burda, Květoslava
Powiązania:
https://bibliotekanauki.pl/articles/1039774.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
carotenoid
antioxidant
stability
chemical oxidation
Opis:
The effect of carotenoids on stability of model photosynthetic pigment-protein complexes subjected to chemical oxidation with hydrogen peroxide or potassium ferricyanide was investigated. The oxidation of carotenoid-less and carotenoid-containing complexes was conducted in the presence or absence of ascorbic acid. The progress of the reactions was monitored by use of absorption and fluorescence spectroscopy. Our results show that carotenoids may significantly enhance the stability of photosynthetic complexes against oxidation and their protective (antioxidant) effect depends on the type of the oxidant.
Źródło:
Acta Biochimica Polonica; 2012, 59, 1; 61-64
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the method of lines for a non-linear heat equation with functional dependence
Autorzy:
Leszczyński, H.
Powiązania:
https://bibliotekanauki.pl/articles/1294376.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
method of lines
stability
consistency
Opis:
We consider a heat equation with a non-linear right-hand side which depends on certain Volterra-type functionals. We study the problem of existence and convergence for the method of lines by means of semi-discrete inverse formulae.
Źródło:
Annales Polonici Mathematici; 1998, 69, 1; 61-74
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effective computation of the first Lyapunov quantities for a planar differential equation
Autorzy:
Gasull, A.
Prohens, R.
Powiązania:
https://bibliotekanauki.pl/articles/1339176.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Lyapunov quantities
weak focus
stability
Opis:
We take advantage of the complex structure to compute in a short way and without using any computer algebra system the Lyapunov quantities $V_3$ and $V_5$ for a general smooth planar system.
Źródło:
Applicationes Mathematicae; 1996-1997, 24, 3; 243-250
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stateczność pił taśmowych
Stability of wood bandsaws
Autorzy:
Król, R.
Powiązania:
https://bibliotekanauki.pl/articles/250259.pdf
Data publikacji:
2015
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
piła taśmowa
stateczność
bandsaw
stability
Opis:
W artykule przeanalizowane zostały zagadnienia związane ze statecznością pił taśmowych do drewna. Nieodpowiedni dobór wymiarów geometrycznych pił taśmowych do warunków cięcia drewna może być przyczyną pękania pił taśmowych lub ich zsuwania się z kół prowadzących, co prowadzi do kosztownych przestojów maszyn w tartakach przetwarzających drewno na skalę masową. W artykule wyznaczone zostały wartości krytycznych sił odporu w oparciu o teorię zwichrzenia belek. Przeprowadzona została także analiza stateczności (ang. buckling analysis) w oparciu o metodę elementów skończonych (MES) przy użyciu programu MSC Marc. W analizie pomi-nięty został wpływ napięcia wstępnego piły taśmowej, które przyczynia się do wzrostu jej sztywności i poprawy stateczności. Z analiz wynika, że ze wzrostem szerokości oraz grubości piły taśmowej poprawia się jej stateczność. Korzystne jest umieszczenie wypadkowej siły odporu możliwie najbliżej kół prowadzących, ale może to przyczyniać się do zsuwania się słabo napiętej piły z kół prowadzących. Na stateczność piły taśmowej wpływa także gatunek ciętego drewna. Siły odporu największe są dla drewna jesionowego oraz dębowego, choć należy mieć na uwadze znaczny rozrzut parametrów fizycznych w obrębie danego gatunku drewna. Rezultaty analiz mogą być wykorzystane przy doborze pił taśmowych do drewna oraz konfiguracji pilarek.
In this paper stability of wood bandsaw was analyzed. Improper selection of the geometric dimensions of wood bandsaw can result in cracking of bandsaw blades or their slipping out of the guiding wheels, which lead to the high costs caused by a downtime of machinery in saw mills. In this article critical values of the feed force was calculated on the basis of the theory of stability of beams. The buckling analysis based on the Finite Element Method was also performed. In the analysis, effect of initial tension was omitted. Initial tension increases stiffness of the bandsaw and increases stability. Calculations based on the theory of stability showed that increase of the wood bandsaw thickness and width lead to better stability of blades. It is also valuable to place a feed force near to the guiding wheels, but in the bandsaws with small initial tension it can lead to slip-ping out the bandsaw blade from the guiding wheels. Bandsaw stability is also influenced by the species of wood being cut. Feed force is highest for the ash and oak, but it should be taken into account that there is large dispersion of physical parameters within the species of wood. Analysis results presented in this paper can be used in selection of wood bandsaw blades and configuration of bandsawing machines.
Źródło:
TTS Technika Transportu Szynowego; 2015, 12; 877-880, CD
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza stateczności statycznej pontonu prostopadłościennego o wymiarach LxBxH
Analysis of the static stability of rectangular pontoon with dimensions LxWxH
Autorzy:
Mironiuk, W.
Pawlędzio, A.
Wróbel, R.
Powiązania:
https://bibliotekanauki.pl/articles/223376.pdf
Data publikacji:
2004
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
stateczność
okręt podwodny
stability
submarine
Opis:
W pracy rozpatruje się zagadnienie stateczności statycznej pontonu prostopadłościennego o wymiarach LxBxH. Analizy problemu dokonano za pomocą obliczeń i napisanego w Instytucie Konstrukcji i Eksploatacji Okrętów programu komputerowego. Krzywa ramion prostujących opisana została trzema zależnościami odpowiadającymi trzem zakresom. Począwszy od kąta wejścia pokładu do wody (lub wyjścia obła), poprzez kąt, przy którym obło wynurza się z wody (lub pokład wchodzi do wody), aż do wartości kątów powyżej wymienionych. Wykorzystany do obliczeń program komputerowy może posłużyć do analizy stateczności statycznej nie tylko pontonów, ale po odpowiednich modyfikacjach także do analizy stateczności okrętu w dowolnym stanie załadowania. Ponadto w pracy przeprowadzono analizę wpływu wymiarów pontonu i położenia środka masy na przebieg krzywej ramion prostujących oraz przedstawiono ich komputerową wizualizację.
The paper deals with the issue of static stability of a rectangular pontoon of LxBxH dimensions. The analysis was carried out by means of calculations and a computer program written in the Institute of Ship Construction and Exploitation. The curve of straightening arms was described with three dependencies corresponding to three ranges. Beginning with the angle at which deck enters water through the angle at which the bilge emerges from water (or deck enters water) up to the values of the angles mentioned above. The computer program used for calculations can be used to analyze ship stability at any condition of loading. In addition, the paper analyzes the effect of dimensions of the pontoon in the place of center of mass on the distribution of curves of strengthening arms, and it also presents their computer image.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2004, R. 45 nr 3 (158), 3 (158); 81-99
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
To determine the stability of the metrobus in unstable driving modes
Autorzy:
Marchuk, Roman
Marchuk, Nazar
Sakhno, Volodymyr
Poliakov, Viktor M.
Powiązania:
https://bibliotekanauki.pl/articles/1838347.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
metrobus roll
acceleration
stability
trailer
Opis:
Recently in many cities of the world began to introduce so-called «metrobus» or BRT (Bus Rapid Transit) systems, which became a cheaper alternative to the metro and other rail transport, in particular trams. The aim of the work is to determine the stability indicators of the metrobus in the transitional traffic modes, in particular when performing such manoeuvres as «steering wheel jerk» and «shuffle». For this purpose, the equations of metrobus plane-parallel motion are supplemented by equations of the links of the road train in the vertical plane by halopilation (tangage, trim) and roll. The critical straight-line speed of the three-link metrobus has been determined, which was 32,06 m/s, and this speed is independent of the corners of the steering wheels of the bus and the trailer links. It has been shown that as the steering wheel angle of the bus increases, the difference in the folding angles of the bus increases, with the second folding angle significantly exceeding the first, especially considering the roll of the metrobus body. It has been established that the greatest rolls and loads of the metrobus axles are those of the last trailer, which is the limiting factor for the critical speed. The lateral accelerations of individual metrobus links and their yaw velocity when performing the manoeuvre «steering wheel jerk» and «shuffle, Sl = 24 m», show that both the bus and the second trailer link are a limiting factor when performing various manoeuvres, but the acceleration value does not exceed the permissible 0.4 g, so its stability under these conditions is ensured.
Źródło:
Archiwum Motoryzacji; 2021, 91, 1; 63-79
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Early Warning Models of Banking Crises: VIX and High Profits
Autorzy:
Bańbuła, Piotr
Pietrzak, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2075289.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
early warning models
financial stability
Opis:
We built a logistic regression Early Warning Models (EWM) for banking crises in a panel of 47 countries based on data from 1970–2014 using candidate variables that cover macro and financial market indicators. We find that VIX, a proxy of global risk-premium, has a strong signalling properties and that low VIX (low price of risk) increases likelihood of crisis. It does not only mean that stability leads to instability, but that this tends to be a global rather than a domestic phenomenon. We also find that particularly high contribution of financial sector to GDP growth often precedes crises, suggesting that such instances are primarily driven by excessive risk taking by financial sector and may not necessarily be sustainable. Other variables that feature prominently include credit and residential prices. Models using multiple variable clearly outperform single variable models, with probability of correct signal extraction exceeding 0.9. Our setting includes country-specific information without using country-specific effects in a regression, which allows for direct application of EWM we obtain to any country, including these that have not experienced a banking crisis
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2021, 4; 381-403
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration analysis during AZ31 magnesium alloy milling with the use of different toolholder types
Autorzy:
Korpysa, Jarosław
Zagórski, Ireneusz
Powiązania:
https://bibliotekanauki.pl/articles/2172033.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
vibration
stability
magnesium alloy
milling
Opis:
Machining vibrations are an important issue as they occur in all types of machining processes. Due to its negative impact on machining results, this phenomenon is undesirable, and so there have been continuous efforts to find solutions that will minimise it, and thus improve the stability and safety of the machining process. The paper attempts to determine the impact of toolholder type and cutting condition on the vibrations generated while milling an AZ31 magnesium alloy. The tests were performed using the three most common types of toolholders: ER, Shrink Fit and hydraulic. The vibration displacement and acceleration signals were analysed based on parameters such as Peak-to-Peak, Peak, and Root Mean Square. Composite Multiscale Entropy was also applied to check the stability of cutting processes and define the level of signal irregularity. To determine the frequencies of vibrations and to detect chatter vibrations Fast Fourier Transform was performed. This provides information on the stability and enables vibrations to be minimized by avoiding unfavourable cutting conditions.
Źródło:
Eksploatacja i Niezawodność; 2022, 24, 3; 489--501
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of stability, adaptability and yield performance of bread wheat (Triticum aestivum l.) cultivars in south estern Ethiopia
Autorzy:
Ayalneh, T
Letta, T.
Abinasa, M.
Powiązania:
https://bibliotekanauki.pl/articles/2199721.pdf
Data publikacji:
2012-12-20
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
adaptability
environment
igenotypes
nteractions
stability
Opis:
he success of crop improvement and production activities can be enhanced with scientific information generated form genotype-environment interactions. GEI reduces the association between phenotype and genotype which result in relative ranking and stability differences of genotypes across environments. This study were conducted with the objective to identify stable, and adaptable bread wheat genotypes under various environments. Eighteen genotypes were tested across nine environments for two years on randomized block design of three replication. Plot size of 1.2 m × 2.5 m and 20cm spacing between rows were used. All recommended agronomic practices and managements were applied uniformly. Data were collected on plot basis and converted to ton ha-1. and analyzed with appropriate statistical software for stability parameters. Combined analysis over nine environments showed, variety Tuse (HAR-1407) ranked first in mean yield(3.11ton × ha-1), and K-6295-4A ranked second (3.01 ton × ha-1) and Dashen came third(2.98 ton ha-1). Analysis of AMMI model showed that the first principal component, PCA 1 explained 53.72% of the interaction sum of squares while the second principal component, PCA 2 explained 17.61% interaction sum of squares. Ecovalence(Wi) analysis showed that G2 (Sofumar(HAR-1889)), G4 (Kubsa(HAR-1685)), G5 (Tura(HAR-1407)), G7 (Galema (HAR-604)), G12 (Wabe (HAR-710)), almost equally the lowest ecovalence that evidenced less fluctuation across environment and found to be stable.
Źródło:
Plant Breeding and Seed Science; 2012, 67; 3-12
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Financial Stability Reports in Latin America and the Caribbean
Autorzy:
Lim, Cheng Hoon
Klemm, Alexander D.
Ogawa, Sumiko
Pani, Marco
Visconti, Claudio
Powiązania:
https://bibliotekanauki.pl/articles/2041937.pdf
Data publikacji:
2019-01
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
Financial Stability Report
Financial Supervision
Opis:
Many countries in Latin America and the Caribbean now publish financial stability reports. They use FSRs as a tool for financial surveillance and communication. This study reviews their latest issues to assess their content, quality, and transparency, and the extent to which the country’s macrofinancial and institutional context affect the quality of the publications. While some reports provide a strong analysis of risks and vulnerabilities, there are significant cross-country differences, and many reports could be improved by adopting a more comprehensive, forwardlooking, and thematic assessment of financial stability. A well thought out communication strategy, including a regular and predictable publication schedule and an easily accessible website, is also important to enhance the impact of the reports. Data gaps, particularly at the disaggregated level, are material and need to be urgently addressed.
Źródło:
Journal of Banking and Financial Economics; 2019, 1(11); 46-78
2353-6845
Pojawia się w:
Journal of Banking and Financial Economics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The essence of the Bank Guarantee Fund’s activity and related dilemmas in the context of banking system stability
Autorzy:
Czechowska, Iwona Dorota
Powiązania:
https://bibliotekanauki.pl/articles/653051.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Bank Guarantee Fund
deposits
stability
Opis:
The deposit guarantee system in Poland was devised at the time of the economic transformation. Its creation resulted from a difficult situation in the banking sector, and so it was meant to be an antidote to clients’ problems associated with the insolvency of collapsing banks and with adjusting to European community law. The aim of this work is to present the Bank Guarantee Fund-an institution that is part of the financial safety net, whose main task is to protect the interest of depositors and to ensure the banking system’s stability. The paper looks at some aspects of the growing interest in bank deposit insurance schemes and lively discussions on the subject during a crisis in banking markets. In response to the crisis that started in the subprime lending market in the USA and spread to other segments of the financial markets as well as to other countries, the ECOFIN made a decision to increase the existing guarantee limits for individual persons and to speed up the payout of guaranteed funds. The above changes were aimed at strengthening the security of clients and increasing confidence in the banking sector.
Źródło:
Annales. Etyka w Życiu Gospodarczym; 2018, 21, 5; 121-130
1899-2226
2353-4869
Pojawia się w:
Annales. Etyka w Życiu Gospodarczym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Explicit Difference Schemes for Nonlinear Differential Functional Parabolic Equations with Mixed Derivatives - Convergence Analysis
Autorzy:
Poliński, Artur
Powiązania:
https://bibliotekanauki.pl/articles/745697.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Finite difference
stability
parabolic
nonlocal
Opis:
We study the initial-value problem for parabolic equations with mixed partial derivatives and constant coefficients, and with nonlinear and nonlocal right-hand sides. Nonlocal terms appear in the unknown function and its gradient. We analyze convergence of explicit finite difference schemes by means of discrete fundamental solutions.
Źródło:
Commentationes Mathematicae; 2005, 45, 2
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bank prudential and bank stability– how far do they go
Autorzy:
Shijaku, Gerti
Powiązania:
https://bibliotekanauki.pl/articles/565688.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
Bank Stability
Prudential behaviour
LLP
Opis:
This paper investigates how bank prudential behaviour affects bank stability, focusing only in the period after the global financial crisis. For this reason, we construct a new composite proxy as a measure for bank stability condition and another one for bank prudential behaviour. Then, we make use of a sample with a set of data for 16 banks operating in the Albanian financial sector over the period 2008 – 2015. The main results provide strong supportive evidence that there exist a strong positive relationship in the prudential – stability nexus, which confirms that prudential behaviour is a key fundamental contributor for bank stability. We also used a quadratic term of the prudential indicator to capture a possible non-linear relationship between bank prudential behaviour and stability, but found no supportive evidence. Finally, macroeconomic conditions are also found to be crucial for bank stability. Similarly, improving operational efficiency and capital structure boost bank stability.
Źródło:
Journal of Banking and Financial Economics; 2017, 2(8); 127-150
2353-6845
Pojawia się w:
Journal of Banking and Financial Economics
Dostawca treści:
Biblioteka Nauki
Artykuł

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