排序方式： 共有46条查询结果，搜索用时 15 毫秒
41.
42.
The study investigated the predictive nature of test anxiety on achievement in the presence of perceived general academic self-concept, study habits, parental involvement in children's learning and socio-economic status. From a population of 2482 Grade 6 students from seven government primary schools of a sub-city in Addis Ababa, 497 participants were randomly selected, namely 248 boys and 249 girls. The mean age of the participants was 12.98 years. An adapted version of Sarason's Test Anxiety Scale (28 items), plus the General Academic Self-Concept Scale (18 items), and Parental Involvement (10 items), Study Habits (10 items) and Socio-Economic Status (10 items) scales developed by the authors were the instruments of the study. The findings of the study indicated: (a) test anxiety correlated with achievement with a weak correlation of ?0.186; and (b) perceived general academic self-concept and study habits were positively and significantly related to achievement. Stepwise multiple regression on achievement resulted in the selection of general academic self-concept, study habits and parental involvement as significant contributors to achievement in that order. Test anxiety was found to be a non-predictor of achievement in the presence of other variables. 相似文献
43.
S. P. Govinda Raju 《Resonance》2010,15(5):400-410
There is much current interest in small unmanned airplanes weighing about five kilograms all the way down to about 100 grams.
Even such small airplanes are capable of performing useful surveillance missions in peace time and during conflicts. As these
airplanes operate at very low flight speeds in the range of about 10–20 m/s, their performance is strongly affected by the
low Reynolds numbers characteristic of such flight. In this article, we consider the special aerodynamic and propulsion problems
associated with the flight of such small airplanes. 相似文献
44.
S. P. Govinda Raju 《Resonance》2009,14(3):272-289
Flight at supersonic speeds is accompanied by standing waves, a phenomenon absent in subsonic flows. The standing waves affect
the flow radically and lead to wave drag and sonic booms. In this article, we explain the above phenomena and their effect
on the performance of airfoils and wings in supersonic flows. In the light of the above, wing configurations suitable for
supersonic airplanes are discussed. 相似文献
45.
S. P. Govinda Raju 《Resonance》2008,13(10):971-977
Aircraft of all types dynamically interact with the atmosphere generate forces required for lift and propulsion. Properties
of the atmosphere and their variations over geographic locations and altitude are thus relevant to aircraft flight operations.
This article presents some facts about the atmosphere and indicates their relevance to flight. 相似文献
46.
Technology has altered the traditional academic library beyond recognition. These dramatic changes have impacted significantly on the knowledge and skills requirements for LIS professionals practising in this environment. While there have been studies in other parts of the world which have investigated the knowledge and skills requirements for the digital era academic library environment, to date no comprehensive study has ‘drilled’ down into this area in the South African context. This paper reports on a preliminary study which is part of a wider study aimed at developing a comprehensive skills statement which would provide an objective framework against which professional LIS practitioners in the modern academic library environment in South Africa may both measure their existing competencies and also identify the need for further skills acquisition. The research question guiding this preliminary investigation was: What key knowledge and skills are required for LIS professionals to effectively and efficiently practise in a digital era academic library in South Africa? The triangulated findings (using content analysis of job advertisements and semi-structured interviews) from this preliminary investigation are used to ascertain an initial picture of key knowledge and skills sets required for LIS professionals in this environment. These preliminary findings also proved useful in teasing out some of the parameters for the wider study targeting the development of a comprehensive skills statement for higher education libraries in South Africa. The study reported here has relevance for the academic library context in other parts of the world as well. 相似文献