The purpose of this study was to assess the effects water storage on surface microhardness (VHN) and fracture toughness (K1C) two self-adhesive restorative materials compared traditional resin composite resin-modified glass ionomer cement (RMGIC) materials. Methods: Two (Activa Vertise Flow), a nonflowable (Filtek Z250), an RMGIC (Fuji II) were evaluated. Hardness measurements (n = 12) recorded...

background: given the greater tendency during adolescence toward risk-taking, identifying and measuring the factors affecting the adolescents’ health is highly important to ensure the efficacy of health promoting interventions. one of these factors is self-transcendence. the aim of this study was to assess the psychometric features of the self-transcendence scale (adolescents’ version) in stude...

The accuracy and stability of self-image of 21 mentally retarded adults and 24 nonretarded adults were studied. The subjects were confronted with a distorting mirror that made their faces look either fatter or slimmer. Results showed that retarded adults saw themselves as more distorted than did non-retarded adults. Significant sex differences in the retarded population were found. Both the pre...

nowadays stable economic development is the most important purpose of developing countries and in this case micro-credits can be an efficient approach that play an important role in achieving firm living in rural areas. the main aim of this research is to analyze the effects of micro-credits on stability of the rural economy and in the end to answer this question whether micro-credits in rural ...

Research on human self-regulation has shown that people hold many goals simultaneously and have complex self-regulation mechanisms to deal with this goal conflict. Artificial autonomous systems may also need to find ways to cope with conflicting goals. Indeed, the intricate interplay among different goals may be critical to the design as well as long-term safety and stability of artificial auto...

We obtain bounds on the stability of various self-gravitating astrophysical objects using a new measure of shape complexity known as configurational entropy. We apply the method to Newtonian polytropes, neutron stars with an Oppenheimer-Volkoff equation of state, and to self-gravitating configurations of complex scalar field (boson stars) with different self-couplings, showing that the critical...

Laser-plasma accelerators can produce high-quality electron beams, up to giga electronvolts in energy, from a centimetre scale device. The properties of the electron beams and the accelerator stability are largely determined by the injection stage of electrons into the accelerator. The simplest mechanism of injection is self-injection, in which the wakefield is strong enough to trap cold plasma...

We report on the longitudinal stability of personality traits across an average 40 years in the Hawaii Personality and Health Cohort relating childhood teacher assessments of personality to adult self- and observer- reports. Stabilities based on self-ratings in adulthood were compared to those measured by the Structured Interview for the Five-Factor Model (SIFFM; Trull & Widiger, 1997), and tra...

In this paper numerical results are reviewed ([13]) that demonstrate that common second-order operator-splitting methods can exhibit instabilities when integrating the Brusselator equations out to moderate times of about seven periods of oscillation. These instabilities are manifested as high wave number spatial errors. In this paper we further analyze this problem and present a theorem for sta...