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Tytuł:
Wyprowadzanie ogólnych dynamicznych równań bonitacyjnych za pomocą uniwersalnej metody rożnic algebraicznych
Derivation of Generic Dynamic Site Equations Using Generalized Algebraic Difference Approach
Autorzy:
Cieszewski, C.J.
Zasada, M.
Powiązania:
https://bibliotekanauki.pl/articles/1026347.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
metoda roznic algebraicznych
bonitacja siedliska
lesnictwo
site index model
site productivity
base−age invariance
dynamic equations
Opis:
This article describes use of the Generalized Algebraic Difference Approach for derivation of generic dynamic site equations. The generic equations are useful in situations of unspecific expectations with regards to the final model form where one wants to test simultaneously in a single fitting many various models and assumptions about the modeled processes. Equations derived in this work are extremely flexible with various patterns of polymorphisms and asymptotes. Even thought in principle the generic equations have more parameters, those derived with methodology proposed here are very parsimonious.
Źródło:
Sylwan; 2003, 147, 03; 40-46
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variable structure observer design for a class of uncertain systems with a time-varying delay
Autorzy:
Liu W., J.
Powiązania:
https://bibliotekanauki.pl/articles/330119.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
obserwator
niezmienniczość
uogólniona odwrotność macierzy
variable structure observer
invariance property
generalized matrix inverse approach
Opis:
Design of a state observer is an important issue in control systems and signal processing. It is well known that it is difficult to obtain the desired properties of state feedback control if some or all of the system states cannot be directly measured. Moreover, the existence of a lumped perturbation and/or a time delay usually reduces the system performance or even produces an instability in the closed-loop system. Therefore, in this paper, a new Variable Structure Observer (VSO) is proposed for a class of uncertain systems subjected to a time varying delay and a lumped perturbation. Based on the strictly positive real concept, the stability of the equivalent error system is verified. Based on the generalized matrix inverse approach, the global reaching condition of the sliding mode of the error system is guaranteed. Also, the proposed variable structure observer will be shown to possess the invariance property in relation to the lumped perturbation, as the traditional variable structure controller does. Furthermore, two illustrative examples with a series of computer simulation studies are given to demonstrate the effectiveness of the proposed design method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 3; 575-583
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Validation of Theoretical and Measurement Model of the Generalized Problematic Internet Use Scale 2 in a Polish Sample
Autorzy:
Ciżkowicz, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/2125135.pdf
Data publikacji:
2022-04-26
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
Generalized Problematic Internet Use (GPIU)
the cognitive-behavioral model of GPIU
Caplan GPIUS2
measurement invariance
Opis:
The Generalized Problematic Internet Use Scale (GPIUS2) was developed to operationalize the theoretical cognitive-behavioral model of GPIU.  The aims of the study were to examine the theoretical model of GPIU, analyze the psychometric properties of the GPIUS2 among Polish adolescents, study measurement invariance across gender and method of data collection (offline vs. online). The sample comprised of 1,621 participants (52% men, Mage = 20.3). Some participants completed an online version of the GPIUS2 (n = 707, 73% men, M = 17.9), and others filled in a pencil and paper version (n = 914, 35% men, M = 22.1). Reliability was assessed (Cronbach’s α; McDonald’s ω). The factor structure and nomological, convergent, and discriminant validity were tested. The findings of this study supported the reliability and the factor structure of the GPIUS2. The factor similarity in Polish sample and the original US sample was high (Tucker’s congruence coefficients were range: .99–1.00). The structural relationships between the constructs of the model, convergent and discriminant validity were confirmed. The strong measurement invariance of the model across gender and method of data collection was confirmed. The Polish version of the GPIUS2 is a reliable and valid instrument that can be used for Polish adolescent samples. The scale showed measurement invariance across gender and method of data collection. Furthermore, the results support the cognitive-behavioral model of problematic Internet use in adolescents.
Źródło:
Roczniki Psychologiczne; 2022, 25, 1; 67-85
1507-7888
Pojawia się w:
Roczniki Psychologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utility functions invariant with respect to some classes of transformations
Autorzy:
Chudziak, J.
Powiązania:
https://bibliotekanauki.pl/articles/206749.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
utility function
invariance
functional equation
additive function
exponential function
Opis:
Inspired by some relevant recent results of A. E. Abbas we determine utility functions invariant with respect to some classes of transformations.
Źródło:
Control and Cybernetics; 2013, 42, 2; 347-363
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Urdu Translation and the Validation of a 14-Item Measure to Assess Stress Management Skills in Healthcare Workers: Measurement Invariance Across Gender
Autorzy:
Ali, Yumna
Farhana Kazmi, Syeda
Powiązania:
https://bibliotekanauki.pl/articles/29433358.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Stress management skills
coping
lifestyle healthcare workers
gender
invariance
Urdu
translation and validation
Opis:
This study aims to conduct an Urdu translation and a validation of the ISBF Stress Management Skills Scale in two distinct phases. The first phase includes the forward-back translation method for ISBF. The second phase includes cross validation and the establishment of psychometric properties for the ISBF scale. A sample of 500 adults working in health care was taken from different hospitals and dispensaries. The first phase of the study includes the forward-back translation method. The second phase includes exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) with invariance measurement. The total reliability of the scale is reported to be .812. EFA revealed a two-factor structure for ISBF scale, with configural, metric and scalar invariance across males and females, and comparable latent mean scores for males and females. CFA showed goodness-of fit indices for the two factors. The scale showed good internal consistency values. The model fit value includes the value for the goodness of fit index, which was .979, for the adjusted goodness-of fit index: .961, for the comparative fit index: .993, for the incremental fit index: .993, and for the root mean square error of approximation (RMSEA) value: .033. Good values of composite reliability and convergent validity were measured for both dimensions of the scale. The scale shows that this diagnostic tool can help to assess the skills used to manage stress. For criterion validity, the coping Inventory for Stressful Situations (CISS-21) was used, which showed positive correlations. The subscale of stress management was taken from the Health Promoting Life Style Profile II (HPLP-II), which also showed positive correlations. Significant mean differences were found between scores of healthcare workers with stress management skills and with those without stress management skills. The group of mean differences indicated the females have greater stress management skills as compared to men. The Urdu translated and validated instrument will be helpful in understanding behavior in healthcare settings.
Źródło:
Ethics in Progress; 2023, 14, 1; 110-125
2084-9257
Pojawia się w:
Ethics in Progress
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transformations within (Existentialist) Invariance in Ariel by Marina Carr with Reference to John Millington Synge’s Riders to the Sea
Transformacje w (egzystencjalnej) niezmienności: analiza porównawcza Ariel Mariny Carr i Riders to the Sea Johna Millingtona Synge’a
Autorzy:
Koneczniak, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/37555754.pdf
Data publikacji:
2024
Wydawca:
Akademia Ignatianum w Krakowie
Tematy:
Carr, Marina
Ariel
Synge, John Millington
Riders to the Sea
analiza porównawcza
niezmienność
Carr
Marina; Synge
John Millington
comparison
invariance
existentialism
Opis:
This article is a comparative analysis of Marina Carr’s Ariel (2002) and John Millington Synge’s Riders to the Sea. The main research context comes from common critical treatments of Carr’s oeuvre within the scope of Synge’s influences. The plays discussed in this essay have not been subject to comparative studies before (to the best of the author’s knowledge). The main argument consists in examining the loci of invariance and their transformations with reference to themes, characters’ roles, and their relationships, which will be compared in terms of notions of necessity, generational suffering, reliance on the worldly, and death in the unknown realm, partly treated within existentialism.
Celem artykułu jest dokonanie analizy sztuki Ariel Mariny Carr i Riders to the Sea Johna Millingtona Synge’a. Twórczość Carr często traktowana jest jako kontynuacja dramaturgii Synge’a i utwory tej irlandzkiej dramatopisarki są analizowane w odniesieniu do dramatów Synge’a. Porównanie Ariel i Riders to the Sea wydaje się jednak tematem, który wciąż warto podejmować i wykazywać aspekty niezmienności i ich transformacji. Omówione porównania dotyczą takich motywów, jak: konieczność, pokoleniowe cierpienie, poleganie na doczesności oraz śmierć w nieznanej przestrzeni. Zostaną one częściowo potraktowane w swoim ogólnym odniesieniu do egzystencjalizmu.
Źródło:
Perspektywy Kultury; 2024, 45, 2; 213-230
2081-1446
2719-8014
Pojawia się w:
Perspektywy Kultury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Survey-based household inflation expectations. Are they valid? A multi-group confirmatory factor analysis approach
Autorzy:
Białowolski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/500699.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
confirmatory factor analysis
consumer confidence indicator
consumer tendency surveys
inflation expectations
measurement invariance
Opis:
We present evidence that micro-level household inflation expectations are influenced by consumer confidence. To account for this impact, using multi-group confirmatory factor analysis, we measure the intertemporal consistency of a model comprising both consumer confidence and inflation expectations. We determine that the model exhibits the property of partial measurement invariance. Thus, we are able to account reliably for the influence of consumer confidence on inflation expectations and, simultaneously, to obtain corrected inflation expectations at the household level. It appears that, after correcting for the level of confidence, average inflation expectations at each point in time become significantly more similar to the average inflation expectations of professional forecasters and more correlated with average consumer confidence. Our analysis is based on household survey data from Poland’s State of the Households’ Survey (from 2000Q1 to 2012Q1), which is conducted in line with the European Commission’s methodology.
Źródło:
Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2015, 96: Analyzing and forecasting economic fluctuations; 49-67
0866-9503
Pojawia się w:
Prace i Materiały Instytutu Rozwoju Gospodarczego SGH
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strzałka czasu a niektóre interpretacje mechaniki kwantowej
Time Arrow and Some Interpretations Of Quantum Mechanics
Autorzy:
Łagosz, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2013391.pdf
Data publikacji:
2006
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
strzałka czasu
EPR-eksperyment
równanie Schrödingera
(a)symetria czasowa
niezmienniczość względem odwrócenia czasu
pomiar kwantowy
parametry ukryte
time arrow
EPR-experiment
Schrödinger’s equation
time (a)symetry
time- reversal invariance
quantal measurements
“hidden variables”
Opis:
In the paper I discuss some premises of “quantum mechanics” with regard to the thesis that the time arrow does (not) exist. In this context I consider above all the famous Einstein-Podolsky-Rosen’s experiment (EPR-experiment). I also indicate Schrödinger’s interpretation of wave function “symmetrical” towards time (nomological isotropy) and the peculiar understanding of the pair particle-antiparticle, assuming that the direction of time can be reversed. Eventually, I discuss the issue of measurement in quantum mechanics with which the existence of time arrow (anisotropy) is often linked. If it comes to the interpretations of quantum mechanics, from the point of which I consider the issues in question, then in principle I limit myself to two: the so-called Copenhagen interpretation and David Bohm’s conception of “hidden parameters.” I arrive at a conclusion that the premises of quantum mechanics that are at issue here cannot be sufficient grounds for a conclusive recognition of the reversibility (non-existence) of time arrow.
Źródło:
Roczniki Filozoficzne; 2006, 54, 2; 391-411
0035-7685
Pojawia się w:
Roczniki Filozoficzne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some applications of Noether’s theorem
Autorzy:
Montiel-Pérez, J. Yaljá
López-Bonilla, J.
López-Vázquez, R.
Vidal-Beltrán, S.
Powiązania:
https://bibliotekanauki.pl/articles/1166045.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Complex Riemann-Silberstein vector
Duality rotations
Ignorable variable
Invariance of the action
Lanczos variational method
Linear differential equation of second order
Maxwell equations
Noether’s theorem
Variation of parameters
Variational symmetry
Opis:
If the action S= ∫_(t_1)^(t_2)▒〖L(q,〗 (q,) ̇t) dt is invariant under the infinitesimal transformation t ̃=t+ε τ(q,t), q ̃_r= q_r+ε ξ_r (q,t),r=1,… ,n, with ε=constant ≪1, then the Noether’s theorem permits to construct the corresponding conserved quantity. The Lanczos approach employs to ε= q_(n+1) as a new degree of freedom, thus the Euler-Lagrange equation for this new variable gives the Noether’s constant of motion. Torres del Castillo and Rubalcava-García showed that each variational symmetry implies the existence of an ignorable coordinate; here we apply the Lanczos approach to the Noether’s theorem to motivate the principal relations of these authors. The Maxwell equations without sources are invariant under duality rotations, then we show that this invariance implies, via the Noether’s theorem, the continuity equation for the electromagnetic energy. Besides, we demonstrate that if we know one solution of p(x)y''+q(x)y'+r(x)y=0, then this Lanczos technique allows obtain the other solution of this homogeneous linear differential equation.
Źródło:
World Scientific News; 2018, 106; 69-80
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risk Attitudes, Buying and Selling Price for a Lottery and Simple Strategies
Autorzy:
Lewandowski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/483243.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wealth-invariance
scale-invariance
CARA
CRRA
DARA
risk aversion
buying and selling price for a lottery
Opis:
This paper defines the concept of simple strategy and introduces three kinds of simple strategies: wealth-invariant, scale-invariant and "wealthier-accept more". For three commonly used utility function families: CARA, CRRA and DARA equivalent characterizations are obtained in terms of the corresponding simple strategy, in terms of the buying and selling price properties, and in terms of the utility function properties as expressed by Cauchy functional equations. Moreover, an extension of famous Pratt (1964) theorem is proved which involves buying price for a lottery as an alternative measure of comparative risk aversion. Additionally a number of propositions on both selling and buying price for a lottery and CRRA utility class are proved.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2013, 5, 1; 1-34
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Psychometric Properties of the Polish Version of the Short Grit Scale
Autorzy:
Wyszyńska, Patrycja
Ponikiewska, Klaudia
Karaś, Dominika
Najderska, Małgorzata
Rogoza, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/2128467.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
grit
consistency of interest
perseverance of effort
success
measurement invariance
Opis:
This study aimed to verify the psychometric properties of the Polish version of the Grit-S questionnaire. Grit is understood here as the perseverance and passion for long-term goals, and it encompasses two dimensions: Consistency of Interest and Perseverance of Effort. The sample comprised N = 270 participants aged 18–34 (Mage = 20.79). We performed confirmatory factor analyses to verify the dimensional structure of grit, multi-group confirmatory factor analysis to compare the structure across gender, and correlation analysis to examine external validity (exploring the correlations between grit, procrastination, and well-being). Findings showed satisfactory parameters for Grit-S including: reliability, structural and external validity, and measurement invariance across gender groups. The results support the possibility of using the Grit-S questionnaire in research exploring the predictors of success.
Źródło:
Polish Psychological Bulletin; 2017, 2; 229-236
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Psychometric properties of the Polish version of the Generalized Anxiety Disorder Scale (GAD-7) in a non-clinical sample of employees during pandemic crisis
Autorzy:
Basińska, Beata A.
Kwissa-Gajewska, Zuzanna
Powiązania:
https://bibliotekanauki.pl/articles/21375403.pdf
Data publikacji:
2023-11-13
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
anxiety
measurement invariance
pandemics
Generalized Anxiety Disorder 7-item scale
multigroup confirmatory factor analysis
employee wellbeing
Opis:
Objectives The COVID-19 outbreak is an example of a crisis that triggered an increase in generalized anxiety disorder. The study aims to validate the Polish version of the Generalized Anxiety Disorder 7-item scale (GAD-7) by Spitzer et al. among a non-clinical sample of employees and examine the invariance depending on the gender and age of working adults. Material and Methods For assessing factor structure of the Polish version of the GAD-7, the data were collected from a sample of 821 adults employed in 4 economic sectors (health care, education, IT, public administration) during the initial phase of the COVID-19 pandemic in Poland (April 10–May 24, 2020). Due to differences in the severity of GAD symptoms across gender and age groups, the measurement invariance in these groups was tested. Results The results of a series of confirmatory factor analyses confirmed the unidimensionality of the GAD-7. The values of the composite reliability index and Cronbach’s α showed that it is a reliable tool. The GAD levels demonstrated strong relationships with professional burnout, psychological distress, and psychological complaints. These relationships were stronger than the relationships between these factors and job satisfaction. Construct, metric and scalar invariance across gender and age groups were documented. Women experienced more severe symptoms of generalized anxiety disorder than men. Generalized anxiety disorder affected 28% of respondents. Conclusions This study contributes evidence of the validation of the GAD among employees and also confirms the invariance depending on gender and age. The Polish version of the GAD-7 has good psychometric properties in a group of professionals and can be recommended for research and to be used in an occupational medicine practice, especially during crisis periods associated with the risk of developing a generalized anxiety disorder.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2023, 36, 4; 493-504
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Periodic solutions in multivariate invariance arguments
Autorzy:
Chudziak, J.
Wójcik, S.
Powiązania:
https://bibliotekanauki.pl/articles/254733.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
multivariate utility function
invariance
periodic solution
additive function
exponential function
Opis:
Inspired by the recent results of A.E. Abbas we determine continuous multivariate utility functions invariant with respect to a wide family of transformations related to the shift transformations.
Źródło:
Opuscula Mathematica; 2013, 33, 3; 455-465
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perfectionism and Marital Satisfaction among Graduate Students: A Multigroup Invariance Analysis by Counseling Help-seeking Attitudes
Autorzy:
Foo, Fatt Mee
Hassan, Siti Aishah
Talib, Mansor Abu
Zakaria, Noor Syamilah
Powiązania:
https://bibliotekanauki.pl/articles/2128459.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
perfectionism
marital satisfaction
counseling help-seeking attitudes
graduate students
latent mean analysis
multigroup invariance analysis
Opis:
This study aims to measure the latent mean difference in perfectionism and marital satisfaction by counseling help-seeking attitudes. The respondents were 327 married graduate students from a research university in Malaysia. An online self-administered questionnaire was used to collect the data. The respondents completed the Almost Perfect Scale-Revised, Dyadic Almost Perfect Scale, Marital Satisfaction Scale, and Attitudes toward Seeking Professional Psychology Help Scale. Confirmatory factor analysis was used to examined the instruments and the results indicated that construct validity were achieved. The latent mean difference in perfectionism and marital satisfaction by counseling help-seeking attitudes were tested using multigroup invariance analysis. The respondents with negative attitudes toward counseling help-seeking (n = 159) reported a higher latent mean in perfectionism but a lower latent mean in marital satisfaction compared to those with positive attitudes toward counseling help-seeking (n = 168). The implications of these findings for counseling services are discussed.
Źródło:
Polish Psychological Bulletin; 2017, 2; 301-306
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ontyczny status wyrażeń według de Saussure’a na tle ujęć chińskich i indyjskich teoretyków języka
Ontic Status of Expressions According to de Saussure in Comparison to the Old Chinese and Indian Conceptions
Autorzy:
Drzazgowska, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/568036.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Mikołaja Kopernika w Toruniu. Wydawnictwo UMK
Tematy:
language
expression
proportion
invariance
non-materiality
opposition
Opis:
The aim of the paper is to point out certain analogies between de Saussure’s theoretical reflection on the ontic properties of expressions and the corresponding old Chinese and Indian concepts. Following a review of de Saussure’s ideas, the author proceeds to present their Eastern analogues. The main focus is turned to the fact that the Chinese Moists as well as the Indian grammarians and philosophers elicited proportion as the key to the understanding of the mechanism of language. The Sanscrit grammarians, the philosophers of Mīmāṃsa as well as, most probably, Gongsun Long in China saw clearly the invariant and non-material nature of expressions. The Buddhist logicians and the Moists also pointed to the oppositional character of expressions as constitutive for language.
Źródło:
Linguistica Copernicana; 2013, 2(10); 51-63
2080-1068
2391-7768
Pojawia się w:
Linguistica Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
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