For a single-component perfect gas, entropy perturbations are associated with the difference between overall density fluctuation and that coming from acoustic perturbation. Entropy can generate sound when accelerated/decelerated by non-uniform flow this is highly relevant to thermoacoustic instabilities for gas turbines rocket engines, noise emission aero-engines. Widely used theories model ent...

a three-year field experiment (2004-2007) was conducted on a silty clay loam soil at tajarak research station of hamedan to determine proper grain drill for wheat in hamedan dryland areas. in this study, three grain drills including: hamedani barzegar; sahalan kesht; and kesht gostar with wheat seed broadcasting and disking were used. the experiment was a randomized complete block design with f...

.1 tlcvice is describetl ~vhich effects a continuous separatior~ of intcrnally infestetl wllcat from sound shea at, and ~11ic11 separates ~vheat into a number of fractions of different test weight. A stream of wheat, projected into still air by rapidly moving belts, is dispersed by the conlbined effects of air drag and gravitation into numerous fractions which are caught in a series of hoppers....

Wheat grain storage protein (GSP) content and composition are the main determinants of the end-use value of bread wheat (Triticum aestivum L.) grain. The accumulation of glutenins and gliadins, the two main classes of GSP in wheat, is believed to be mainly controlled at the transcriptional level through a network of transcription factors. This regulation network could lead to stable cross-envir...

in this study, the level of cations and anions of saline soil leaching was investigated in laboratory conditions by using of magnetic water. silty loam soil was poured in 50 cm height and 10 cm diameter pipes while the end of each pipe was closed with a filter paper and a plastic net. leaching was conducted alternatively after passing water through the magnetic field with different intensities....