by shouldering the burden of a big chunk of global production, and giving shelter to half of the world’s population, currently cities play an important role in national economies. benefits of agglomeration in cities have played a major role in the process of economic development of different countries, however, the expansion of urbanization has produced some problems including environmental and...

size reduction of high energy materials such as 1, 3, 5, 7-tetranitro- 1, 3, 5, 7-tetraaza cyclooctane (hmx) has considerable influences on improving their explosive characteristics. in this study, nanosized hmx par­ticles were produced using ultrasonically reprecipitation method by applying water as a safe and accessible antisolvent instead of unsafe conventional methods. sem photographs revea...

the influence of mo particle size on the catalytic activity and product selectivity of alkalized mos2 nanocatalysts has been investigated. nanocatalysts are prepared using a microemulsion technique with water-to-surfactant ratios of 1-12. three different techniques, including xrd, tem, and hydrogen chemisorption were used to determine the molybdenum average particle size and their activity and ...

1. Abstract A simulation analysis of a new method to identify a raw coal separation process to produce concentrate, middle product and refuse is presented in the paper. The washability characteristic of a raw coal, the partition curve of a gravitational separator and separation densities have been identified. The washability characteristic determines the yield and ash content (or other quality ...

We apply the two-sector production function developed by Ram (1986) to estimate the threshold regression model for Iran, concerning the effect of government size on economic growth. Three government size indicators are used to find out the different threshold points. The results show a non-linear relationship of the Armey curve in Iran, in which the threshold effects corresponding to total gove...

For primes p, we study the maximal possible size of a p-core p′-partition (a partition with no hook lengths or parts divisible by p). McDowell recently proved that maximum is attained unique partition, say Λp. Using his graph-theoretic description Λp, prove for p>106 that124p6−p5p<|Λp|<124p6−1200p5p, which shows |Λp|∼p6/24 as p→∞.