Abstract The fatigue life and cutting performance of conical pick is essential for the roadheader machine in the excavation engineering.In rock breaking process, the rock structural conditions has a certain influence on the rock breaking and rock damage with roadheader breaking rock.Established the simulation model of conical pick cutting jointed r
Sexual selection is expected to drive phenotypic differences between conspecific male and females, a widespread phenomenon known as sexual dimorphism.At the same time, individuals may exhibit some degree of intra-sexual variation.We examined the sexual dimorphism and inter-individual variation in different body parts of Creophilus maxillosus L.(Col
River water quality monitoring must be carried out because rivers are a source of fresh water for the community.Tributaries in the city of Pekanbaru receive waste from domestic activities, industry, livestock, and agricultural runoff, reducing river water quality.The pollution index is one of the most effective tools for informing river water quali
Digital image analysis (DIA) is a new method in assessment of islet amount, which is expected to provide reliable and consistent results.We compared this method with conventional counting of small numbers of rat islets.Islets were isolated from 8 pancreases and counted in 24 samples in duplicate, first routinely by sizing according to estimated dia