我国南方的草地资源与草地牧业

我国南方有十四个主要草地植被类型。它的草场面积大,产草量高,载畜潜力大,但目前放牧利用率低,草食家畜少。南方草地畜牧业总的情况是发展缓慢。可是草地有5.6～8倍的增产潜力,且有推动南方草地牧业发展的其他有利条件,我国南方草地牧业在未来必将获得较大的发展。     

Effect of ZnO nanoparticles on anti-aging properties of polyurethane coating

Polyurethane nano-coatings were prepared by adding nano-concentrates with nanometer zinc oxide （nano-ZnO） to polyurethane coating. The dispersion state of nanoparticles was observed by TEM images. SEM observation and FT-IR analysis indicate that the nano-coating with 1% ZnO nanoparticles can retain better morphological structure than the nano-coating with 5% ZnO nanoparticles after 500 h accelerated aging. It is known from XPS analysis that the anti-oxidation properties of polyurethane coating are enhanced by 1% ZnO nanoparticles through the nano-network and destroyed by 5% ZnO nanoparticles due to the strong light catalysis. A small change in capacitances of nano-coatings with 1% ZnO nanoparticles before and after accelerated aging indicates that 1% ZnO nanoparticles improve the corrosion resistance of coating, while a large increase in capacitances of nano-coating with 5% ZnO nanoparticles before and after accelerated aging demonstrates that 5% ZnO nanoparticles damage the corrosion resistance of coating.     

North China sub-craton lithospheric structure elucidated through coal mine blasting

We present a super-range seismic observation along the >1300-km-long profile passing through the Yinchuan basin and the Ordos block from the blasting point towards the southeast triggered by a large-(dynamite) scale coal blast in the Ningxia Hui Autonomous Region’s Helan Mountain (yielded a profile). The seismic wave information from the uppermost mantle reflecting different depths was obtained by the China continental seismic survey. Pn refracted waves from the uppermost mantle were effectively traced up t...     

Impact of alkali and heat pretreatment on the pathway of hydrogen production from sewage sludge

Due to the presence of various types of hydrogen-producing bacteria and numerous organics such as protein and carbohydrate,sewage sludge is a potential material for biological hydrogen production.In this study,two batch tests were carried out to investigate the impact of alkali and heat pretreatment on the pathway of hydrogen production from sewage sludge.The results showed that the heat treatment had a stronger lethal effect on bacteria than the alkali treatment,and could effectively kill hydrogen-consumin...