Recalled test anxiety in relation to achievement,in the context of general academic self-concept,study habits,parental involvement and socio-economic status among Grade 6 Ethiopian students

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.     

‘Time: What is it That it can be Measured?’

Experiments with the simple pendulum are easy, but its motion is nevertheless confounded with simple harmonic motion. However, refined theoretical models of the pendulum can, today, be easily taught using software like CALCODE. Similarly, the cycloidal pendulum is isochronous only in simplified theory. But what are theoretically equal intervals of time? Newton accepted Barrow’s even tenor hypothesis, but conceded that ‘equal motions’ did not exist – the refutability of Newtonian physics is independent of time measurement. However, time measurement was the key difficulty in reconciling Newtonian physics with electrodynamics. On Poincaré’s criterion of convenience, equal intervals of time ought be so defined as to make the enunciation of physics simple. Hence he postulated constancy of the speed of light. (The Michelson–Morley experiment was not critical.) The theory of relativity followed. But does there exist a proper clock?     

GTR component of planetary precession

Even as the theory of relativity is more than a hundred years old, it is not within easy reach of undergraduate students. These students have an insatiable urge to learn more about it even if the full machinery of the tools required to study the same is not within their comfortable reach. The recent detection of gravitational waves has only augmented their enthusiasm about the General Theory of Relativity (GTR), developed just over a hundred years now, encapsulated in Einstein’s Field Equations. The GTR provided a consistent formulation of the theory of gravity, removed the anomalies in the Newtonian model, and predicted spectacular natural phenomena which eventual experiments have testified to. This pedagogical article retraces some of the major milestones that led to the GTR and presents a simple numerical simulation of the GTR advance of the perihelion of planetary motion about the sun.     

Postural,Visual, and Manual Coordination in the Development of Prehension

We investigated the real-time cascade of postural, visual, and manual actions for object prehension in 38 6- to 12-month-old infants (all independent sitters) and eight adults. Participants’ task was to retrieve a target as they spun past it at different speeds on a motorized chair. A head-mounted eye tracker recorded visual actions and video captured postural and manual actions. Prehension played out in a coordinated sequence of postural–visual–manual behaviors starting with turning the head and trunk to bring the toy into view, which in turn instigated the start of the reach. Visually fixating the toy to locate its position guided the hand for toy contact and retrieval. Prehension performance decreased at faster speeds, but quick planning and implementation of actions predicted better performance.     

Application of Tucatinib and Trastuzumab: Dual Anti HER2 Therapy Against HER2 Positive Breast Cancer

Synergism in action of tucatinib and trastumab is reported in breast cancer management. However, its molecular basis is yet to be determined. In this context we attempted to provide an explanation at the molecular level by performing in silico experimentation and coupling its result with already available published observations. Our study will provide basis for planning further experimental study for unravelling the truth.     

Aerobasics — An introduction to aeronautics 2. The atmosphere

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.     

Knowledge and skills for the digital era academic library

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.     

Serum Lp(a) in diabetics with and without evidence of clinical nephropathy—A preliminary study

Type 2 diabetes is associated with a marked increase in the risk of coronary artery disease. Dyslipidaemia is believed to be a major cause of this increased risk. Recently, elevated levels of lipoprotein (a), Lp(a), have been reported to be associated with an increased risk. However there is very little data regarding Lp(a) concentrations and type 2 diabetes from India. The objective of the study was to assess serum Lp(a) levels in type 2 diabetics with and with out evidence of clinical nephropathy. We estimated serum Lp(a) levels in 30 control subjects, 30 diabetics without evidence of clinical nephropathy and 30 diabetics with evidence of clinical nephropathy. Statistical analysis showed that Lp(a) levels were increased in diabetic patients with nephropathy (mean 46.3±17.6 mg/dl). The Lp(a) levels however did not differ significantly between control (mean 20.2±15.9 mg/dl) and diabetics without nephropathy (mean 22.6±13.1mg/dl). Thus diabetes per se seems to have little or no influence on serum Lp(a) levels, however elevated levels were seen in patients with nephropathy.     

Aerobasics — An introduction to aeronautics 15. Mini and micro airplanes

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.