It is well known that three momentum wheel actuators can be used to control the attitude of a rigid spacecraft and that arbitrary reorientation maneuvers of the spacecraft can be accomplished using smooth feedback. If failure of one of the momentum wheel actuators occurs, we demonstrate that two momentum wheel actuators can be used to control the attitude of a rigid spacecraft and that arbitrar...

This study seeks to investigate the effect of explicit and implicit corrective feedback on the narrative writing of advanced Iranian EFL learners. In so doing, the study was conducted with 76 advanced EFL learners from 3 intact classes at an English language teaching institute in Iran. The sample was selected from among 92 learners by means of Oxford Quick Placement Test. After the researchers ...

The paradigm shift from testing the outcome to assessing the learning of process shines a light on the alternative assessment approaches, among which portfolio-assessment has sparked researchers’ interest in writing instruction. This study aimed at investigating the effect of portfolio-assessment on Iranian EFL students’ writing achievement through the process-centered approach to writi...

ethical conflicts are recognized as critical aspects in assessing competence in clinical communication. moreover, pediatrics residents may face more problems, compared to other disciplines; due to the specific characteristics of the age group receiving services as well as the presence of their families. this study has been conducted with the aim of determining the attitude and perspective of pe...

BACKGROUND A negative attitude toward disability is one of the potential barriers for people with disability (PWD) to achieve social equality. Although numerous studies have investigated attitudes toward disability, few have evaluated personal attitudes toward disability among PWD, and made comparisons with attitudes of healthy respondents. This study was to investigate and compare the attitude...

INTRODUCTION As part of a longitudinal study of midlife women, the aim of this investigation was to describe the intensity of menopausal symptoms in relation to the level of perceived stress in a woman's life and her attitudes toward menopause and aging. METHODS Data were collected on 347 women between 40 and 50 years of age in Northern California who began the study while premenopausal. Wome...