overcoming spatial and temporal limitation, information and communication technology is today considered as the axis and key to sustained development and as the most important criterion for development which has reshaped the world and life patterns and it is, in fact, considered both the cause and the effect of development. identifying and proper using of new opportunities for sustained develop...

iran is one of the world's arid regions and exposed to dust particles in the air. this is important in spatial and temporal terms as well as the affects human health. in this paper a day when due to the amount of dust particles visibility reduces to 5,000 m is considered the dusty day. in the spatial and temporal analysis of dusty days 38 synoptic stations were studied. in order to conduct data...

Many quantum key distribution (QKD) implementations using a free space transmission path are restricted to operation at night time in order to distinguish the signal photons used for a secure key establishment from background light. Here, we present a lean entanglement-based QKD system overcoming that limitation. By implementing spectral, spatial and temporal filtering techniques, we were able ...

The memory wall continues to pose a performance bottleneck for computer systems—studies show that modern servers spend up to two-thirds of execution time stalled on memory accesses. Although recent trends forecast growth in processor clock frequencies to be minimal, improvements to memory access latencies are correspondingly slow. Traditional approaches, such as large on-chip caches, hardware m...

Covariance functions and variograms play a fundamental role in exploratory analysis and statistical modelling of spatial and spatio-temporal datasets. In this paper, we construct a new class of spatial covariance functions using the Fourier transform of some higher-order kernels. Moreover, we extend this class of spatial covariance functions to the spatio-temporal setting using the idea used in...

the rapid change of land use and land cover in the metropolitan area of tehran has influenced the distribution pattern of land surface temperature (lst). in this study, a spatial autocorrelation analysis is adopted to process the spatial-temporal changes of lst and normalized difference vegetation index (ndvi) in tehran during the period of 1987 to 2010. global spatial autocorrelation analysis ...