2篇
您的检索式：作者名="Chengxuan ZHAO"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Theoretical analysis of the electric potential and the electrostatic dust transport around the Shackleton crater in the Lunar south pole region显示文摘In recent years,the Lunar south pole region(SPR)has become the focus of future explorations due to its special illumination condition and the possible water ice in permanently shadowed craters around it.The Shackleton crater locates almost exactly at the Moon’s south pole and has become the hottest destination for several landing missions,including the Chang’E-7 mission.However,people still know little about the electric potential and the dust environment around this crater.In this paper,we develop an analytical model to study the surface potential and the electrostatic dust transport around the crater.It is found that the crater’s floor can be negatively charged due to the topographic shielding,and the surface potential is as low as-175 V on the leeward crater wall.Accordingly,a large number of charged dust grains can be emitted from the leeward crater wall,with a maximum height of about 10 km and a horizontal distance of about 40 km,which brings a local dust cloud around the crater.Both the topographic shielding and the local dust cloud are qualitatively verified by a numerical simulation,in which a typical dust density of 10^(4)-10^(5)m^(-3)is found near the crater.Our results are important to the environmental assessment for future explorations near the crater.Furthermore,the results are helpful to understand the surface charging and the electrostatic dust transport on the other airless bodies. | Chengxuan ZHAO Hong GAN Lianghai XIE Yi WANG Yongjun WANG Jingyan HONG | 2023 | Science China Earth Sciences2023，66，10： | 0 |
| 2 | Vertical microbial profiling of water column reveals prokaryotic communities and distribution features of Antarctic Peninsula显示文摘Prokaryotic diversity and community composition in the water column of eight stations(63 samples) around the Antarctic Peninsula of the Southern Ocean were investigated. Through pyrosequencing of the V3–V4hypervariable regions of the 16S ribosomal RNA gene, we characterized 4 720 089 valid reads representing 48 188operational taxonomic units(OTUs, 97% similarity). The community was dominated by the phyla Pseudomonadota(original name: Proteobacteria, 47%), Oxyphotobacteria(26%), and Bacteroidota(original name: Bacteroidetes, 18%), which comprised an average of 91% of the total OTUs in all samples. The prokaryotic community composition varied vertically within the water column. Water column prokaryotic communities exhibited a clear depth profile, with higher microbial richness and higher diversity observed with increasing water depth. Cluster analysis of the community composition of water column samples exhibited a similar trend with depth. Correlation with environmental factors suggested distinct variation in prokaryotic community composition with changes in depth, salinity, temperature and dissolved oxygen levels. Functional prediction showed presence of active nitrogen, sulphur and methane metabolic cycles along the vertical transect of the studied region. These results will improve our knowledge of prokaryotic diversity and community composition at different depth of water column for better understanding of the microbial ecology and nutrient cycles in Antarctic Peninsula region of the Southern Ocean. | Jiang Li Luying Zhao Xiaoqian Gu Chengxuan Li Qian Zhang Liping Fu Ao Zhang | 2023 | Acta Oceanologica Sinica2023，42，9： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员