Spatiotemporal variations in the organic carbon accumulation rate in mangrove sediments from the Yingluo Bay,China,since 1900

Mangroves can not only provide multiple ecosystem service functions,but are also efficient carbon producers,capturers,and sinks.The estimation of the organic carbon accumulation rate(OCAR)in mangrove sediments is fundamental for elucidating the role of mangroves in the global carbon budget.In particular,understanding the past changes in the OCAR in mangrove sediments is vital for predicting the future role of mangroves in the rapidly changing environment.In this study,three dated sediment cores from interior and fringe of mangroves in the Yingluo Bay,China,were used to reconstruct the spatiotemporal variations of the calculated OCAR since 1900 in this area.The increasing OCAR in the mangrove interior was attributed to mangrove flourishment induced by climate change characterized by the rising temperature.However,in the mangrove fringe,the strengthening hydrodynamic conditions under the sea level rise were responsible for the decreasing OCAR,particularly after the1940 s.Furthermore,the duration of inundation by seawater was the primary factors controlling the spatial variability of the OCAR from the mangrove fringe to interior,while the strengthened hydrodynamic conditions after the 1940 s broke this original pattern.

Detection of metastasis of mediastinal lymph nodes in lung cancer patients with an artificial intelligence model

To the Editor:Lung cancer leads to the largest number of cancer-associated deaths in the world.As the main means of the spreading of lung cancer,lymph node metastasis is related to the strategy for its treatment and the prognosis of the patients.[1]According to guidelines of the National Comprehensive Cancer Network,once mediastinal lymph nodes have been involved,patients are considered to have reached an advanced stage of lung cancer,and the treatment strategy should be different.[2]Computed tomography(CT)is a common method for the preoperative prediction of lymph node metastasis among lung cancer patients.However,not all abnormal lymph nodes can be recognized preoperatively with CT.Thus,more accurate prediction of lymph node metastasis is important for lung cancer treatment.

Design and Realization of Recovery System of Chang’e-5 Reentry Spacecraft

On December 17,2020,the Chang’e-5 reentry spacecraft landed safely and brought back the lunar sample without damage.This paper describes the recovery system that has critically contributed to the scientific success of the Chang’e-5 missions and presents the technical requirements and constraints of the recovery system for the Chang’e-5 reentry spacecraft and discusses the design process of the recovery system,including the system composition,working procedure,and some other key aspects.Finally,the ground cover rejection tests and air drop and flight tests were carried out to confirm the design configuration.The results showed that the Chang’e-5 reentry spacecraft recovery system was designed correctly,and its functions and performances met the design requirements.A breakthrough in the recovery technology of the reentry spacecraft was achieved for Chinese first lunar sample-return mission.