To speak fluently is a complex skill. In order to help the learner to acquire it we propose an electronic version of an age old method: pattern drills (PD). While being highly regarded in the fifties, pattern drills have become unpopular since then. Despite certain shortcomings we do believe in the virtues of this approach, at least with regard to the memorization of basic structures and the ac...

Knowledge of appropriate behaviour during an earthquake is crucial for prevention of injury and loss of life. The Israeli Home Front Command conducts a yearly earthquake education programme in all Israeli schools, using three types of educational interventions: lectures, drills and a combination of the two. The aim of this study was to evaluate the effectiveness of these interventions in provid...

Rotary drills, diamond drills and percussive drills have been extensively used in open pits, quarries and construction sites. The prediction of the penetration rate of drilling machines is very important in the cost estimation and the planning of the rock excavation projects. The rock modulus ratio, which is the ratio of elastic modulus to compressive strength, indicating the deformability, is ...

The recent loss of lives and traffic jams (Figure 1) for tens of miles as hurricanes Rita and Katrina approached the Gulf coast demonstrate the enormous difficulty in evacuating urban areas [6]. Besides hurricanes, evacuation may be necessary due to other potential disasters, e.g., fire, terrorism, and nuclear or chemical plant accidents. Thus, the local emergency management community engages i...

purpose: the aim of this study was to compare the effects of a) a flame heated endo plugger, b) gatesglidden drills and c) gpx drills on the apical seal for the purpose of post space preparation. materials & methods: the crowns of sixty six extracted maxillary central teeth were removed from cej by a diamond disc and the root canals were prepared and obturated with guttapercha and sealer (ah26)...

The aim of this study was to compare changes in young soccer player's fitness after traditional bilateral vs. unilateral combined plyometric and strength training. Male athletes were randomly divided in two groups; both received the same training, including strength training for knee extensors and flexors, in addition to horizontal plyometric training drills. The only difference between groups ...