Non-invasive measurement of Cerebral Blood Flow (CBF) is now feasible thanks to the introduction of Arterial Spin Labeling (ASL) Magnetic Resonance Imaging (MRI) techniques. To date, the low signalto-noise ratio of ASL gives us no option but to repeat the acquisition in order to accumulate enough data to get a reliable signal. Perfusion signal is usually extracted by averaging across the repeti...

guilan province is located in north of iran. it plays an important natural, economic and strategic role in iranian history due to its geographical location between the caspian sea and the alborz mountain. this particular characteristic of guilan has made it one of the most important political centers in its history and in the history of its struggles against the central government of iran. iran...

For the first time, an assemblage of cryptospores, which includes 10 species belonging to nine genera, from the Upper Ordovicianstrata, is being reported, in Iran. These cryptospore assemblages were recovered from the upper part of Ghelli Formation., from theeastern Alborz Mountain range. These peri-Gondwanan cryptospores have been classified based on their morphology (monad, truedyad, pseudody...

We establish the existence of an entire solution for a class of stationary Schrödinger systems with subcritical discontinuous nonlinearities and lower bounded potentials that blow up at infinity. The proof is based on the critical point theory in the sense of Clarke and we apply Chang’s version of the mountain pass lemma for locally Lipschitz functionals. Our result generalizes in a nonsmooth f...

For symbols see Fig. 2. Figure 2. The experimental second-order spatial longitudinal velocity correlation. Figure 3. The experimental second-order spatial longitudinal velocity correlation from the high Reynolds number grid generated isotropic turbulence (Stewart and Townsend 1951). Solid and dashed lines are the same as in Fig. 2.

sakiabad is one of the most important sites in the choqakhor pond’s basin which show remains of nomadic settlement in the chalcolithic period. salvage excavation was carried out for two months during autumn and winter of 2011. by digging of five trenches10×10 m, one of the nomadic settlements was exposed with mud and stone architecture made from the local materials in the region. exposed space ...

Alpine permafrost occurrence in maritime climates has received little attention, despite suggestions that permafrost may occur at lower elevations than in continental climates. To assess the spatial and altitudinal limits of permafrost in the maritime Southern Alps, we developed and tested a catchment-scale distributed permafrost estimate. We used logistic regression to identify the relationshi...

We describe the implementation and evaluation of a prototype American Sign Language (ASL) generation component that produces animations of ASL classifier predicates, some frequent and complex spatial phenomena in ASL that no previous generation system has produced. We discuss some challenges in evaluating ASL systems and present the results of a userbased evaluation study of our system. 1 Backg...

Changes in cerebral blood flow (CBF) may occur with acute exposure to high altitude; however, the CBF of the brain parenchyma has not been studied to date. In this study, identical magnetic resonance scans using arterial spin labeling (ASL) were performed to study the haemodynamic changes at both sea level and high altitude. We found that with acute exposure to high altitude, the CBF in acute m...