We take up Peter Cameron’s problem of the classification of countably infinite graphs which are homogeneous as metric spaces in the graph metric [Cam98], working toward an explicit catalog of “known” examples on the one hand, and an investigation of the cases which occur as exceptional cases from the perspective of the catalog. We begin with a presentation of Fräıssé’s theory of amalgamation cl...

The dense plasma phase of a dynamic z-pinch working at a high filling pressure is studied. By using the Schlieren-technique it is found that the compressed plasma column, though macroscopically stable for times less than 1 /us develops quickly from a homogeneous state to a turbulent one with a perturbation scale length of typically some millimeters. Quantitative measurements of light deflection...

in this article wee seek to suggest an analytical model for explaining the israeli foreign policy. to do this, we must, on the one hand, survey briefly the main theories of foreign polcy and, on the other, to review the literature about the israeli foreign policy. the major question this paper would ask is: what are the main factors shaping the israeli foreign policy and which one might be said...

this study was designed to investigate the effect of grammar and vocabulary pre-teaching, as two types of pre-reading activities, on the iranian efl learners’ reading comprehension from a schema–theoretic perspective. the sample consisted of 90 female students studying at pre-university centers of isfahan.  the subjects were randomly divided into three equal-in-number groups. they participated ...

in the present study, a heterogeneous and homogeneous gas flow dispersion model for simulation and optimization of a large-scale catalytic slurry reactor for the direct synthesis of dimethyl ether (dme) from synthesis gas (syngas) and co2, using a churn-turbulent regime was developed. in the heterogeneous flow model, the gas phase was distributed into two bubble phases including small and large...