Fine-grained public key encryption with keyword search (PEKS), allowing users to on encrypted data flexible access control policy, has been widely studied recently due its promising application real-world scenarios such as cloud computing. However, most of the existing fine-grained PEKS schemes are either only able support single (e.g., attribute-based control) or susceptible being attacked com...

determining the relative sensitivity of land to erosion and its factors, could be the basis of soil conservation programs. the aim of this study is to compare water and wind erosion functions in land degradation of dasht-e-jeihoon using psiac and irifr.ea models and the source studying of aeolian sediments in geomorphologic facieses as homogeneous units. the results indicate that in dasht-e-jei...

There is a trend towards multicore or manycore processors in computer architecture design. In addition, several parallel programming models have been introduced. Some extract concurrent threads implicitly whenever possible, resulting in fine grained threads. Others construct threads by explicit user specifications in the program, resulting in coarse grained threads. How these two mechanisms imp...

introduction more than 90% of drinking water in cities around the world and about 40% of the agricultural water supply from groundwater resources.,thus, groundwater quality consideration issue is inevitable . one of the most important parameter which can show the quality of drinking water is nitrate concentration. nitrate enters the groundwater and surface water through the decomposition of hum...

Abstract The grain size of clastic rocks is one the most important structural characteristics sediments, which can directly reflect hydrodynamic conditions ancient sedimentary period. preparation conventional rock particle samples usually done by hand wet grinding with a hammer experienced experimenter. For fine-grained rocks, method for preparing has disadvantages long time and low efficiency....