Search results for "equation"
showing 10 items of 4219 documents
Psychometric evaluation of the Finnish version of the impact on participation and autonomy questionnaire in persons with multiple sclerosis
2017
Objective: The objective of this study was to evaluate the psychometric properties of the impact on participation and autonomy (IPA) questionnaire. The Finnish version of IPA (IPAFin) was translated into Finnish using the protocol for linguistic validation for patient-reported outcomes instruments. Methods: A total of 194 persons with multiple sclerosis (MS) (mean age 50 years SD 9, 72% female) with moderate to severe disability participated in this study. A confirmatory factor analysis (CFA) was used to confirm the four factor structure of the IPAFin. The work and educational opportunities domain was excluded from analysis, because it was only applicable to 51 persons. Internal consistency…
Cross-diffusion effects on stationary pattern formation in the FitzHugh-Nagumo model
2022
<p style='text-indent:20px;'>We investigate the formation of stationary patterns in the FitzHugh-Nagumo reaction-diffusion system with linear cross-diffusion terms. We focus our analysis on the effects of cross-diffusion on the Turing mechanism. Linear stability analysis indicates that positive values of the inhibitor cross-diffusion enlarge the region in the parameter space where a Turing instability is excited. A sufficiently large cross-diffusion coefficient of the inhibitor removes the requirement imposed by the classical Turing mechanism that the inhibitor must diffuse faster than the activator. In an extended region of the parameter space a new phenomenon occurs, namely the exis…
Schmelz- und kristallisationserscheinungen bei makromolekularen substanzen. II. Haupt- und nachkristallisation aus der unterkühlten schmelze von 4,6-…
1960
Mit einer Dichtewaage werden Kristallisationsisothermen von 4,6-Polyurethan aufgenommen. Nach einer Beschreibung der Apparatur werden die Mesergebnisse im Temperaturbereich oberhalb 163°C und uber Kristallisationszeiten von zehn Minuten bis zu zwei Tagen mitgeteilt. Zur Deutung der Kristallisationsisothermen wird zwischen Haupt- und Nachkristallisation unterschieden. Die Hauptkristallisation wird als Wachstum morphologischer Strukturen verstanden und die Nachkristallisation als langsame Verbesserung des masigen mittleren Ordnungsgrades innerhalb dieser Strukturen. Die Hauptkristallisation wird im Sinne von AVRAMI, EVANS und MORGAN ausgewertet. Fur die systematischen Abweichungen von der AVR…
The Structure and Correlates of a Measure of Prosocial Moral Reasoning in Adolescents from Spain
2013
Examined the structure and correlates of a measure of prosocial moral reasoning in a sample of young and middle-aged adolescents. 1556 students (53% male, M age = 13.12, SD = .87) from Valencia, Spain completed paper-and-pencil measures of prosocial moral reasoning (PROM), empathy, prosocial behaviors, and aggression. As expected, a series of confirmatory factor and structural equation modeling analyses revealed a four-factor solution of the PROM to have the best fit (as compared to alternative models) among Spanish youth (across gender and grade). Moreover, higher level and other-oriented forms of prosocial moral reasoning were generally positively related to empathy and prosocial behavior…
The Predictive Role of Ideological, Personality and Psychopathological Factors in Homonegative Attitudes in Italy
2021
Homonegativity refers to a series of prejudicial and discriminatory attitudes towards individuals perceived as homosexuals. Previous studies indicated that some person- ality traits (i.e., neuroticism, low openness to experience), as well as specific ideo- logical attitudes (i.e., conservatism, authoritarianism) and higher levels of psychopa- thology make individuals more prone to show homonegative attitudes. However, no studies have compared these three dimensions in order to identify their different role in homonegativity. For this reason, the aim of this study was to simultaneously eval- uate the association of ideological, personality, and psychopathological factors with homonegativity …
Cross‐national outcomes of stress appraisal
2012
PurposeThe present study aims to analyze the role of the appraisal of stressors as harmful and threatening (distress) and/or as opportunities and challenges (eustress) in inducing negative (burnout) and positive (engagement) effects. It compares appraisal of occupational stressors in Poland and Spain and looks for differences between these countries in the associations between different types of appraisals and their positive and negative outcomes.Design/methodology/approachThe study analyzes the equivalence of relations across cultures by constraining structural equation models to be equivalent across the Spanish (n=603) and Polish (n=147) data sets of social care services employees. Multig…
Be congruent and I will be loyal: the case of sport services
2019
This research analyzes the relationship between brand perception of users of a sports service and their levels of loyalty. Data were treated with both SPSS 23 and EQS 6.3, using CFA to confirm reliability and validity and creating a model to be tested. Congruence explain 43% of credibility and that these two variables explain up to 73% of trust. Credibility and trust can explain up to 73% of the attitudes, while attitudes would explain up to 50% of loyalty. In the case of sports services, brand perception and its relationship with loyalty remain largely unaddressed. For this reason, it is interesting to carry out research on this subject, bringing new evidence to business reality to help ma…
A WAVELET OPERATOR ON THE INTERVAL IN SOLVING MAXWELL'S EQUATIONS
2011
In this paper, a differential wavelet-based operator defined on an interval is presented and used in evaluating the electromagnetic field described by Maxwell's curl equations, in time domain. The wavelet operator has been generated by using Daubechies wavelets with boundary functions. A spatial differential scheme has been performed and it has been applied in studying electromagnetic phenomena in a lossless medium. The proposed approach has been successfully tested on a bounded axial-symmetric cylindrical domain.
Observation of Kuznetsov-Ma soliton dynamics in optical fibre
2012
International audience; The nonlinear Schro¨dinger equation (NLSE) is a central model of nonlinear science, applying to hydrodynamics, plasma physics, molecular biology and optics. The NLSE admits only few elementary analytic solutions, but one in particular describing a localized soliton on a finite background is of intense current interest in the context of understanding the physics of extreme waves. However, although the first solution of this type was the Kuznetzov-Ma (KM) soliton derived in 1977, there have in fact been no quantitative experiments confirming its validity. We report here novel experiments in optical fibre that confirm the KM soliton theory, completing an important serie…
Energy and Personality: A Bridge between Physics and Psychology
2021
[EN] The objective of this paper is to present a mathematical formalism that states a bridge between physics and psychology, concretely between analytical dynamics and personality theory, in order to open new insights in this theory. In this formalism, energy plays a central role. First, the short-term personality dynamics can be measured by the General Factor of Personality (GFP) response to an arbitrary stimulus. This GFP dynamical response is modeled by a stimulus¿response model: an integro-differential equation. The bridge between physics and psychology appears when the stimulus¿response model can be formulated as a linear second order differential equation and, subsequently, reformulat…