study area is located in the central kopehdagh north of bojnurd and shirvan cities, between kakli and raz villages. aim of this research is separating high activity area from low activity. in this study, in order to evaluate rate of tectonic activity, stream length-gradient index (sl), ratio of valley floor width to valley height (vf), transverse topographic system (t), hypsometric integral (hi...

Studies of dune vegetation patterns have emphasized two structuring agents: local environmental gradients that shape the prominent zonation of coastal plant species, and disturbance patches initiated by overwash during coastal storms. For dune systems of two barrier islands in the Georgia Bight, we investigate how the interplay of these two conceptual frames generate patterns in (1) longitudina...

The objective of the NASA Aviation Safety Program is to improve the safety of current and future aircraft operating in the National Airspace System. Research under this program has focused on vehicle design, construction, operation and maintenance. Reducing aircraft loss of control accidents is critical to increasing aviation safety as it is the largest and most fatal aircraft accident category...

The hippocampus receives two streams of information, spatial and nonspatial, via major afferent inputs from the medial (MEC) and lateral entorhinal cortexes (LEC). The MEC and LEC projections in the temporoammonic pathway are topographically organized along the transverse-axis of area CA1. The potential for functional segregation of area CA1, however, remains relatively unexplored. Here, we dem...

in central part of kopeh dagh there is an array of active right-lateral strike-slip faults that obliquely cut the range and produce offsets of several kilometers in the geomorphology and geological structure. geomorphic indices indicate the presence of differential uplifting in history of this area. tectonic activity of the study area is investigated by a large number of dem derived catchments ...

A n a u t o m a t e d s y s t e m h a s b e e n d e v e l o p e d t o g e n e r a t e g r i d D T M d a t a f r o m a r a s t e r i z e d topographic map. Conventional methods used are based o n either "raster-vector conversion" o r " l i n e following" and require a lot o f manual input and computing time. The system developed here is based on automated recognition of color contour lines from ...

When a uid ow interacts with a topographic feature, and the uid can support wave propagation, then there is the potential for waves to be generated upstream and/or downstream. In many cases when the topographic feature has a small amplitude the situation can be successfully described using a linearised theory, and any nonlinear e ects are determined as a small perturbation on the linear theory....

We classify transverse Hopf links in the standard contact 3-space up to transverse isotopy in terms of their components’ self-linking number. 1 The statement of result A contact structure on a 3-manifold is a completely non-integrable 2-plane field on it. Let ξ0 be the standard contact structure on 3-space R 3 = {(x, y, z)}, that is, a 2-plane field on R defined by the kernel of the 1-form dz −...