in this paper mathematical structure of time-dependent lagrangian systems and their symmetries are extended and the explicit relation between constants of motion and infinitesimal symmetries of time-dependent lagrangian systems are considered. starting point is time-independent lagrangian systems ,then we extend mathematical concepts of these systems such as equivalent lagrangian systems to the...

Background: Hospital as the gravitational center of the health and treatment system and an open system involving complex processes and various (qualitative and quantitative) resources, needs an effective leadership style and an approperiate strategy to solve the organizational disagreements and conflicts in order to achieve its basic objectives. The object of this research is to study the relat...

normal 0 false false false en-us x-none ar-sa microsoftinternetexplorer4 background: after conducting a study on shift work and its related health problems in a petrochemical company and recommending a new shift system, the company changed its shift schedule from 12-hour to 8-hour pattern. after a year of implementing this new system, the present study was carried out to evaluate the effects of...

background: the purpose of the present study was to examine the reliability of scapular kinematic measurements using motion analysis system in subjects with and without general hypermobility syndrome. methods: a methodological study was designed to assess the reliability of scapular movement measurement in two groups of females with and without general hypermobility syndrome. upward rotation, s...