Terrigenous components in three sedimentcores from the Mendeleev-Alpha Ridge,central Arctic Ocean,have been investigated toreconstruct late Quaternary variations insedimentation,ice-rafted detritus (I
宜居行星是指表面可维持液态水长期稳定存在的类地行星.宜居行星为类似地球生命的存在提供了可能.目前一般认为最可能首先在红矮星周围发现宜居行星,因此探索植物在红矮星宜居行星上的生长情况有重要意义.
白令海是北太平洋北缘的半封闭边缘海,也是全球高硅质生产力海区之一.硅藻等硅质浮游生是该海区表层生产力的主要贡献者,其死亡后的骨骼物质保存在沉积物中,成为了生物硅的主要来源和重要组成成分,并以此记录了该海区不同时期的古生产力特征.
金星是距离地球最近的行星,因其大小及质量与地球相近,被称为地球的"姐妹星".但是他们也有很多的不同之处.比如,地球大气的主要成分是氮气和氧气,而金星大气的主要成分是二氧化碳;地球上的云由水蒸气组成,而金星上的云则由高浓度的硫酸组成.研究行星间为什么存在这些不同,不仅可以帮助我们理解因细微演化过程不同所带来的行星的多样性,而且也向我们展示了地球大气演化的各种可能性.
Methane hydrate deposits below seafloor exist in unconsolidated formation,and stability and mechanical behaviour of the wellbore and the surrounding formation are important study issues.
In order to consider the potential geohazards during methane gas production from hydrate bearing sediments,accurate numerical modelling and simulation of the large scale geomechanical behavior is requ
Casing integrity during well production could be compromised due to gas hydrate dissociation and destabilization of marine gas hydrate-bearing sediments (HBS) induced by a hot wellbore.
Integrating 3D seismic survey and well logging can achieve more accurate quantification of natural gas hydrates as a potential energy and environmental impact.
A novel technique for methane recovery from methane hydrate involving a combination of flue gas injection and depressurisation and its accompanying CO2 sequestration was studied.Test conditions (273.2
Separating CO2 from the coal-fired flue gas based on gas hydrate crystallization process is considered as a novel,green and low energy consumption method.However,almost all investigations on this tech