Three sporopollen assemblages are recognized for the first time from the Cretaceous Yimin Formation in the Hailar Basin of eastern Inner Mongolia. They are （in ascending order）： the lmpardecispora-Aequitriradites- ...Three sporopollen assemblages are recognized for the first time from the Cretaceous Yimin Formation in the Hailar Basin of eastern Inner Mongolia. They are （in ascending order）： the lmpardecispora-Aequitriradites- Clawttipollenites assemblage; the Triporoletes-Pilosisporites-Asteropollis assemblage; and the Appendicisporites- Asteropollis-Tricolpites assemblage, distributed in Members 1, 2 and 3 of the Yimin Formation respectively. Recognition of this biostratigraphic sequence is very important for the division and correlation of the Yimin Formation in the basin. Meanwhile, the age of the Yimin Formation is considered to be Barremian to Early Albian based on the palynological data.展开更多
Objective The Hailar Basin is situated in the northwestern margin of the Jiamusi-Mongolia Block.It was a continent marginal basin to the south of the Mongolia-Okhotsk Ocean during the Jurassic and Cretaceous.The basem...Objective The Hailar Basin is situated in the northwestern margin of the Jiamusi-Mongolia Block.It was a continent marginal basin to the south of the Mongolia-Okhotsk Ocean during the Jurassic and Cretaceous.The basement of the basin is a late Paleozoic marine deposit.The filling of the basin is characterized by terrestrial volcanic rocks。展开更多
Abundant palynological fossils are found from the drill core in the west slope of Songliao Basin, the first full coring borehole that drilled throughout the Neogene. Two Palynological assemblages are recognized accord...Abundant palynological fossils are found from the drill core in the west slope of Songliao Basin, the first full coring borehole that drilled throughout the Neogene. Two Palynological assemblages are recognized according to their vertical distributions, i.e., the late early Miocene-middle Miocene assemblage from the Da＇an Formation named as Caryapollenites sim- plex-Momipites coryloides-Celtispollenites sp.-TsugaepoUenites igniculus, and the late Miocene-early Pliocene assemblage from the Taikang Formation named as Artemisiaepollenites minor-BetulaceoipoUenites sp.-Carpinipites sp.-Polypodiaceae- sporites sp. On the basis of the composition of each assemblage, we infer that the climate was warm-temperate to sub-tropic during the late early Miocene-middle Miocene and the vegetation was mainly deciduous broadleaved forest and subordinate coniferous and broad-leaved mixed forest with few understory ferns, and probably some shallow fresh water wetlands. The climate then turned cooler and drier in the late Miocene-early Pliocene, represented by the development of xerophytic herbs and temperate plants, although the canopy of the forest remained relatively stable. The results significantly improve the under- standing of the Cenozoic palynostratigraphy in the Songliao Basin, and provide new data for both stratigraphical correlation and paleovegetational and paleoclimatical analysis in adjacent area.展开更多
With the recent boom in unmanned aerial vehicle (UAV) technology, many UAV applications involving complex and risky tasks in military and civilian fields have emerged, such as military strikes and disaster monitoring....With the recent boom in unmanned aerial vehicle (UAV) technology, many UAV applications involving complex and risky tasks in military and civilian fields have emerged, such as military strikes and disaster monitoring. Task allocation for UAVs is the process of planning the division of work among UAVs, controlled from ground stations by human operators. This study formulates the UAV task-allocation problem as an extended traveling salesman problem and presents a novel UAV task-allocation model for complex air concentration monitoring tasks. Then, an optimized non-dominated sorting genetic algorithm III (NSGA-III) based on a twin-exclusion mechanism, hierarchical objective-domination operator, and segmented gene encoding (i.e., NSGA-III-TEHOD) is developed to solve complex task-allocation problems involving multiple UAVs, hierarchical objectives, obstacles, and ambient wind. The algorithm is tested in several simulations, and the results demonstrate that the new algorithm outperforms NSGA-III, non-dominated sorting genetic algorithm II (NSGA-II), and genetic algorithm (GA) in terms of efficiency of global convergence and early maturation prevention and is available for the hierarchical objective-optimization problems.展开更多
文摘目的:探讨基于电子计算机断层扫描(computed tomography,CT)肝癌三维切片(three dimensional slicer,3D slicer)人工智能(artificial intelligence,AI)建模精准辅助外科的应用效果。方法:选择2018年6月-2020年9月本院收诊的60例肝癌患者,均行腹腔镜肝切除术。按照有无辅助应用基于CT的3D slicer AI建模分为试验组(n=30,应用)与对照组(n=30,未应用)。观察两组手术出血量、肝门阻断时间、手术时间,分析两组术后7 d前白蛋白(prealbumin,PAB)、白蛋白(albumin,ALB)、转铁蛋白(transferrin,TRF)水平,比较其术后7 d静息能量消耗(resting energy expenditure,REE)水平、分化簇4(cluster of differentiation 4,CD4^(+))/分化簇8(cluster of differentiation 8,CD8^(+)),且需统计其转开腹率、术后7 d并发症发生率及围手术期死亡率。结果:试验组手术出血量较对照组少,肝门阻断时间、手术时间均较对照组短,差异均有统计学意义(P<0.05)。两组术后7 d PAB、ALB、TRF、CD4^(+)/CD8^(+)水平均较术前降低,但试验组均较对照组高,差异均有统计学意义(P<0.05);而其术后7 d REE水平较术前升高,但试验组较对照组低,差异均有统计学意义(P<0.05)。试验组转开腹率、围手术期间死亡率与对照组相比,差异均无统计学意义(P>0.05)。试验组并发症发生率较对照组低,差异有统计学意义(P<0.05)。结论:基于CT的3D slicer AI建模辅助肝癌患者完成腹腔镜肝切除术,有助于减少患者的手术时间、手术出血量与并发症情况,可促使患者的血清内脏蛋白水平尽早恢复正常,且能够改善其能量代谢与免疫功能。
基金This research is financialy supported by the National Natural Science Foundation of China(No.49894190)the Scientific Key Foundation of Daqing Oilfield Company Ltd.(No.QR/A04-2-01).
文摘Three sporopollen assemblages are recognized for the first time from the Cretaceous Yimin Formation in the Hailar Basin of eastern Inner Mongolia. They are （in ascending order）： the lmpardecispora-Aequitriradites- Clawttipollenites assemblage; the Triporoletes-Pilosisporites-Asteropollis assemblage; and the Appendicisporites- Asteropollis-Tricolpites assemblage, distributed in Members 1, 2 and 3 of the Yimin Formation respectively. Recognition of this biostratigraphic sequence is very important for the division and correlation of the Yimin Formation in the basin. Meanwhile, the age of the Yimin Formation is considered to be Barremian to Early Albian based on the palynological data.
基金supported by the National Natural Science Foundation of China(grant Nos.31670215,31270277)。
文摘Objective The Hailar Basin is situated in the northwestern margin of the Jiamusi-Mongolia Block.It was a continent marginal basin to the south of the Mongolia-Okhotsk Ocean during the Jurassic and Cretaceous.The basement of the basin is a late Paleozoic marine deposit.The filling of the basin is characterized by terrestrial volcanic rocks。
基金financially supported by the National Basic Research Program of China(Grant No.2006CB701401)the National Natural Science Foundation of China(Grant No.31270277)
文摘Abundant palynological fossils are found from the drill core in the west slope of Songliao Basin, the first full coring borehole that drilled throughout the Neogene. Two Palynological assemblages are recognized according to their vertical distributions, i.e., the late early Miocene-middle Miocene assemblage from the Da＇an Formation named as Caryapollenites sim- plex-Momipites coryloides-Celtispollenites sp.-TsugaepoUenites igniculus, and the late Miocene-early Pliocene assemblage from the Taikang Formation named as Artemisiaepollenites minor-BetulaceoipoUenites sp.-Carpinipites sp.-Polypodiaceae- sporites sp. On the basis of the composition of each assemblage, we infer that the climate was warm-temperate to sub-tropic during the late early Miocene-middle Miocene and the vegetation was mainly deciduous broadleaved forest and subordinate coniferous and broad-leaved mixed forest with few understory ferns, and probably some shallow fresh water wetlands. The climate then turned cooler and drier in the late Miocene-early Pliocene, represented by the development of xerophytic herbs and temperate plants, although the canopy of the forest remained relatively stable. The results significantly improve the under- standing of the Cenozoic palynostratigraphy in the Songliao Basin, and provide new data for both stratigraphical correlation and paleovegetational and paleoclimatical analysis in adjacent area.
基金the National Key Research and Development Program of China (No. 2017YFC0209902)。
文摘With the recent boom in unmanned aerial vehicle (UAV) technology, many UAV applications involving complex and risky tasks in military and civilian fields have emerged, such as military strikes and disaster monitoring. Task allocation for UAVs is the process of planning the division of work among UAVs, controlled from ground stations by human operators. This study formulates the UAV task-allocation problem as an extended traveling salesman problem and presents a novel UAV task-allocation model for complex air concentration monitoring tasks. Then, an optimized non-dominated sorting genetic algorithm III (NSGA-III) based on a twin-exclusion mechanism, hierarchical objective-domination operator, and segmented gene encoding (i.e., NSGA-III-TEHOD) is developed to solve complex task-allocation problems involving multiple UAVs, hierarchical objectives, obstacles, and ambient wind. The algorithm is tested in several simulations, and the results demonstrate that the new algorithm outperforms NSGA-III, non-dominated sorting genetic algorithm II (NSGA-II), and genetic algorithm (GA) in terms of efficiency of global convergence and early maturation prevention and is available for the hierarchical objective-optimization problems.
