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The movement of objects by means of vibrations is a widely known idea, used for bodies transportation in automated industry based on vibrating bases, on which the transported elements are placed. We consider an inversed idea: vibration is applied to the movable element. Surface, on which this displacement must be realized, is unmovable. The asymmetry of the friction forces in the different phases of the vibration is the cause of motion in this case. A distinctive feature of the proposed device is a slope of the plane of vibration of the inertial mass, which leads to increasing of the asymmetry of friction. In this paper, we consider an example of application of the device to the lateral vehicle parking. The idea is numerically estimated and tested with a laboratory prototype. The movement along a straight line of the trolley with sloped vibrating mechanism under influence of asymmetric friction forces has been estimated and practically simulated with the laboratory prototype.
The article evaluates 12 cases of conservative treatment of
displaced mandibular fractures in adults. Twelve cases of displaced mandibular
fractures treated surgically, either by closed reduction (IMF) or open reduction
internal fixation (ORIF) served as controls. Occlusion, maximal mouth opening,
lateral jaw movements, neurological dysfunction (=sensory deficit), and bone
remodeling were evaluated and scored in both groups, and results were compared.
No significant differences were found between the two groups in all the
evaluated parameters. It is concluded that in certain cases, with displacement
of 2 - 4 mm, where a surgical approach is not feasible, reasonable
spontaneous reduction and bone remodeling can occur. Meticulous follow-up is
The aim of the current preliminary research was
to examine the relationship between aquatic motor activities and language abilities.
Our hypothesis suggests that changing the environment to water may improve motor
and linguistic abilities. The study included 94 children between the ages of four
and six. Thirty-one children who participated in aquatic motor activities were compared
to 41 children who participated in on-land motor activities and to 21 children who
participated in non-motor activities. Developmental-functionality tests, including
gross and fine motor, time estimation and language tests, were used to diagnose
participants’ abilities before and after six months of intervention. We found significant
improvement in gross motor, fine motor and time estimation abilities for the aquatic
motor activities group. Moreover, improvement in gross motor and time estimation
abilities moderated the association between aquatic motor activities and children’s
naming ability, suggesting the positive effect of aquatic motor activities on language
abilities. Based on these novel findings, child-development professionals can have
a better understanding of relation between language abilities and motor abilities,
possibly leading to an improvement of intervention methods with early-childhood
patients. Early childhood intervention could aid in reducing primary differences
between children in motor abilities, and especially in motor-development disorders,
which in turn are thought to lead to additional learning disabilities.