wheat is one of the important food staff in consumption pattern of each country. more than 50 % of human energy is supplied from bread in the developing country. combine losses is less than 2-3% in developed countries, while in developing country is about 15-20% in different regions and circumstances of harvesting seasons and field conditions. in this research project that effect of combine typ...

The excavation of hard rock roadways in coal mines is often the environment underground water and high ground temperature, it easy to be affected by dynamic load, which leads roadway destruction increases difficulty support. ring sandstone specimens with different inner diameters (0~25 mm) were treated temperature coupled, compression test was produced Hopkinson pressure rod device (SHPB). expe...

Rock fragmentation in mining and construction industries is widely achieved using drilling blasting technique. The technique remains the most effective efficient means of breaking down rock mass into smaller pieces. However, apart from its intended purpose breakage, throw, heave, operations generate adverse impacts, such as ground vibration, airblast, flyrock, fumes, noise, that have significan...

For many years, studies of chromosome evolution were dominated by the random breakage theory, which implies that there are no rearrangement hot spots in the human genome. In 2003, Pevzner and Tesler argued against the random breakage model and proposed an alternative "fragile breakage" model of chromosome evolution. In 2004, Sankoff and Trinh argued against the fragile breakage model and raised...