有宇宙弦的热暗物质宇宙中的成团过程

宇宙早期核合成的理论结果表明,重子物质只占宇宙物质中的很少部分。另一方面,宇宙空间几何的平性表明密度因子Ω=1,这意味着宇宙物质的大部分是以暗物质的形式存在的。目前实验中已确认存在的仅参与弱相互作用的粒子只有中微子,如果中微子确具有不等于零的静止质量,则中微子应成为暗物质的第一个候选者。但是。

Technology for Comprehensive Utilization and Commercial Application of Coal,Oil and Gas at Yanchang Oil Group Passed Appraisal

On June 16,2016 the technical achievement of the Shaanxi Yanchang Oil Group relating to ＂the integrated process technology for comprehensive utilization of coal,oil and gas and their commercial application＂ has passed the experts’appraisal in Beijing.It is said that this achievement has shattered the traditional precedent and engineering paradigm of using coal or natural gas to simplistically manufacture methanol and has carved out a new mode for comprehensive utilization of coal, oil and gas resources, featuring apparent emissions reduction ef-fects with innovative nature to command a leading posi-tion internationally.