incidence and source of anxiety of midwifery students in conduct their first vaginal examination     sarashti m [1] *, banaiyan sh [2] , kazamiyan a 2 , delaram m 2 , safdari f 2 , salahiyan t [3]     received: 3july, 2011 accepted: 25august, 2011     abstract   background & aims : the professional education can be a very stressful experience. vaginal examinations are especially sensitive, both...

1. introduction the process by which the net radiation is transformed to the atmospheric dynamical energy, occur to a large degree at the interface between the surface and the atmosphere. as the driving force for such process, an accurate estimation of the net radiation at the earth’s surface is a necessary input for surface process models. net radiation is a key component in the surface radiat...

introduction mineral composition of source rock is one of the most important factors for concentration and distribution of heavy metals in sediments. therefore, study on distribution of these elements and the related minerals in sediments provides information about natural origin of elements. moreover, the interpretation of origin and distribution of sandy sediments is considerably enhanced by ...

1. introduction a drought is a prolonged period of water deficit and usually occurs when an area does not receive significant precipitation for a sustained period of time, say several months (chen, kuo, & yu, 2009; linsely, kohlerm, & paulhus, 1959). the effects of drought often accumulate slowly over a considerable period of time that may linger for several years even after the termination of dr...

1. introduction climate is a large system which is produced due to the relation and action between other large systems. if a change occurs in one of these systems, other systems will coordinate themselves with the change fast or slowly. the consequences of this coordination will impress the system that is starter of this change and an endless continuum of the links connects these systems togeth...