Sinus-node function was characterized in 13 patients during cardiac catheterization by the introduction of progressively premature atrial depolarizations. Curves relating the extent of sinus-node depression following these premature depolarizations and their degree of prematurity were constructed. The maximum extent of sinus-node depression following premature depolarizations and A-V-nodal and ...

The form and morphology criteria are among  effective components in enhancement and improvement of urban environments and one of the features of successful urban spaces, is the way these criteria are arranged alongside each other especially at the visual landscape of an entrance space, because entrance of every place is the first and most important communication ring between the person and the ...

9 10 11 12 13 14 15 16 17 18 Laboratory column experiments involving steady flow in homogeneous soil are often analyzed assuming that the flow is spatially uniform in any plane transverse to the longitudinal axis aligned with the column centerline. Axisymmetric steady flow in such a column was analyzed to determine the impact of radially nonuniform boundary conditions at the column entrance and...

In pediatric radiology, radiological protection is of vital importance due to the great radio-sensitivity of body tissues in childhood, which can come to present stochastic effects as children have a longer life expectancy. The objective of this research is to establish diagnostic reference levels in chest exam pediatric patients. The study, carried out in one of the largest pediatric centers o...

introduction one of the important problems that most of the metropolitans encounter with is natural disasters. earthquake is a main natural disaster. annually 27 sever earthquakes are happened by nineteen thousands killed and twenty six homeless. in recent report of united nations planning office in 2003, iran has had the first position in number of earthquakes with severity higher than 5.5 ric...

the limit and definition of the cultural zone of jazmurian in the southeastern iran is identical with the geographical boundarise of jazmurian basin and in geographical setting. the cultural zone of jazmurian could be identified with the ancient makan of akadian period, gedrosia and achofadjia of historical period. the remains of ancient city of jiroft during islamic period at the archeaologica...

Nesting cavities are often a limited resource that multiple species use. There is an ongoing discussion on whether invasive cavity nesting birds restrict the availability of this key limited resource. While the answer to this question has important conservation implications, little experimental work has been done to examine it. Here, we aimed to experimentally test whether alien cavity nesting ...