随着无线通信技术的发展,智能超表面(Reconfigurable Intelligent Surface, RIS)辅助通感一体化(Integrated Sensing and Communication, ISAC)技术越来越受到关注。针对RIS辅助ISAC系统中基站获取瞬时信道状态信息(Channel State Infor...随着无线通信技术的发展,智能超表面(Reconfigurable Intelligent Surface, RIS)辅助通感一体化(Integrated Sensing and Communication, ISAC)技术越来越受到关注。针对RIS辅助ISAC系统中基站获取瞬时信道状态信息(Channel State Information, CSI)开销过大的问题,提出了一种利用统计CSI的联合波束成形设计方案。利用统计信道状态信息,分析了系统遍历速率的确定性等价式;在感知性能约束下,通过最大化该确定性等价式,提出了一种设计最优基站发送协方差矩阵和RIS对角相移矩阵的交替优化算法;仿真结果验证了所提方案的有效性,并揭示了通信与感知性能之间的折中关系。展开更多
The effect of various depositional parameters including paleoclimate,paleosalinity and provenance,on the depositional mechanism of lacustrine shale is very important in reconstructing the depositional environment.The ...The effect of various depositional parameters including paleoclimate,paleosalinity and provenance,on the depositional mechanism of lacustrine shale is very important in reconstructing the depositional environment.The classification of shale lithofacies and the interpretation of shale depositional environment are key features used in shale oil and gas exploration and development activity.The lower 3rd member of the Eocene Shahejie Formation(Es_(3)^(x)shale)was selected for this study,as one of the main prospective intervals for shale oil exploration and development in the intracratonic Bohai Bay Basin.Mineralogically,it is composed of quartz(avg.9.6%),calcite(avg.58.5%),dolomite(avg.7%),pyrite(avg.3.3%)and clay minerals(avg.20%).An advanced methodology(thin-section petrography,total organic carbon and total organic sulfur contents analysis,X-ray diffraction(XRD),X-ray fluorescence(XRF),field-emission scanning electron microscopy(FE-SEM))was adopted to establish shale lithofacies and to interpret the depositional environment in the lacustrine basin.Six different types of lithofacies were recognized,based on mineral composition,total organic carbon(TOC)content and sedimentary structures.Various inorganic geochemical proxies(Rb/Sr,Ca/(Ca+Fe),Ti/Al,Al/Ca,Al/Ti,Zr/Rb)have been used to interpret and screen variations in depositional environmental parameters during the deposition of the Es_(3)^(x)shale.The experimental results indicate that the environment during the deposition of the Es_(3)^(x)shale was warm and humid with heightened salinities,moderate to limited detrital input,higher paleohydrodynamic settings and strong oxygen deficient(reducing)conditions.A comprehensive depositional model of the lacustrine shale was developed.The interpretations deduced from this research work are expected to not only expand the knowledge of shale lithofacies classification for lacustrine fine-grained rocks,but can also offer a theoretical foundation for lacustrine shale oil exploration and development.展开更多
柴胡是我国传统中药,其正品为伞形科植物柴胡或狭叶柴胡的干燥根。由于柴胡广泛的药理活性及临床应用范围,使得关于柴胡及其有效成分的研究受到广泛重视。柴胡皂苷a是从柴胡中分离得到的具有多种药理活性的天然化合物,在抗肿瘤、抗炎、...柴胡是我国传统中药,其正品为伞形科植物柴胡或狭叶柴胡的干燥根。由于柴胡广泛的药理活性及临床应用范围,使得关于柴胡及其有效成分的研究受到广泛重视。柴胡皂苷a是从柴胡中分离得到的具有多种药理活性的天然化合物,在抗肿瘤、抗炎、抗癫痫、保肝护肝等方面均展现出良好的应用前景。基于CNKI与ISI Web of Knowledge数据库查找及追溯了近年来关于柴胡皂苷a的最新研究文献报道,归纳总结了其药理学研究进展,以期为相关研究人员提供参考。展开更多
桑黄作为重要的大型药用真菌,应用历史悠久,疗效显著,受到人们的广泛关注。现代研究表明桑黄具有抗炎、抗氧化、降血糖、保肝、抗肿瘤、免疫调节等多种功效,在健康辅助食品、天然药物等领域具有广阔的应用前景。本文基于中国知网(CNKI)...桑黄作为重要的大型药用真菌,应用历史悠久,疗效显著,受到人们的广泛关注。现代研究表明桑黄具有抗炎、抗氧化、降血糖、保肝、抗肿瘤、免疫调节等多种功效,在健康辅助食品、天然药物等领域具有广阔的应用前景。本文基于中国知网(CNKI)、Web of Science、Pubmed等数据库,总结了近年来桑黄药理作用研究的最新成果,以期为桑黄的深入研究与开发提供参考。展开更多
基金supported by the National Science and Technology Major Project of China(Grant No.2017ZX05009-002)the National Natural Science Foundation of China(Nos.U1762217,41702139,42072164 and 41821002)+2 种基金Taishan Scholars Program(No.TSQN201812030)the Fundamental Research Funds for the Central Universities(19CX07003A)the School of Geosciences,China University of Petroleum,East China,for analytical support and financial support。
文摘The effect of various depositional parameters including paleoclimate,paleosalinity and provenance,on the depositional mechanism of lacustrine shale is very important in reconstructing the depositional environment.The classification of shale lithofacies and the interpretation of shale depositional environment are key features used in shale oil and gas exploration and development activity.The lower 3rd member of the Eocene Shahejie Formation(Es_(3)^(x)shale)was selected for this study,as one of the main prospective intervals for shale oil exploration and development in the intracratonic Bohai Bay Basin.Mineralogically,it is composed of quartz(avg.9.6%),calcite(avg.58.5%),dolomite(avg.7%),pyrite(avg.3.3%)and clay minerals(avg.20%).An advanced methodology(thin-section petrography,total organic carbon and total organic sulfur contents analysis,X-ray diffraction(XRD),X-ray fluorescence(XRF),field-emission scanning electron microscopy(FE-SEM))was adopted to establish shale lithofacies and to interpret the depositional environment in the lacustrine basin.Six different types of lithofacies were recognized,based on mineral composition,total organic carbon(TOC)content and sedimentary structures.Various inorganic geochemical proxies(Rb/Sr,Ca/(Ca+Fe),Ti/Al,Al/Ca,Al/Ti,Zr/Rb)have been used to interpret and screen variations in depositional environmental parameters during the deposition of the Es_(3)^(x)shale.The experimental results indicate that the environment during the deposition of the Es_(3)^(x)shale was warm and humid with heightened salinities,moderate to limited detrital input,higher paleohydrodynamic settings and strong oxygen deficient(reducing)conditions.A comprehensive depositional model of the lacustrine shale was developed.The interpretations deduced from this research work are expected to not only expand the knowledge of shale lithofacies classification for lacustrine fine-grained rocks,but can also offer a theoretical foundation for lacustrine shale oil exploration and development.
文摘柴胡是我国传统中药,其正品为伞形科植物柴胡或狭叶柴胡的干燥根。由于柴胡广泛的药理活性及临床应用范围,使得关于柴胡及其有效成分的研究受到广泛重视。柴胡皂苷a是从柴胡中分离得到的具有多种药理活性的天然化合物,在抗肿瘤、抗炎、抗癫痫、保肝护肝等方面均展现出良好的应用前景。基于CNKI与ISI Web of Knowledge数据库查找及追溯了近年来关于柴胡皂苷a的最新研究文献报道,归纳总结了其药理学研究进展,以期为相关研究人员提供参考。
文摘桑黄作为重要的大型药用真菌,应用历史悠久,疗效显著,受到人们的广泛关注。现代研究表明桑黄具有抗炎、抗氧化、降血糖、保肝、抗肿瘤、免疫调节等多种功效,在健康辅助食品、天然药物等领域具有广阔的应用前景。本文基于中国知网(CNKI)、Web of Science、Pubmed等数据库,总结了近年来桑黄药理作用研究的最新成果,以期为桑黄的深入研究与开发提供参考。
