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Fast thermal responsive separators toward long-life and safe lithium metal batteries

Nano Research 2024年第4期17卷 2746-2754页

作者： Pingan Li Zhifang Liu Yitong Peng Shanshan Yang Tao Meng yunhuan hu Yingjun Jiang Hao Sun Qi Li Xianluo hu State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Lithium metal batteries(LMBs)have been extensively investigated during the past decades because of their ultrahigh energy densities.With the increasing demand for energy density,however,the safety issue of LMBs has become a significant challenge.In particular,localized areas of increased temperature(namely,hotspots)may be induced and even exacerbated within LMBs by uneven current distribution,internal short circuits,or inadequate heat dissipation,which significantly sacrifices battery safety and cycle life.Here,we report the rational design and fabrication of a fast thermal responsive separator capable of inhibiting the growth of lithium dendrites and mitigating thermal propagation,thereby reducing the risk of thermal runaway.The as-achieved separator comprises both an electrospun membrane using a phase change material with superior thermal-storage ability and a thermally conductive modification layer of hexagonal boron nitride nanosheets with a fast heat-transfer feature.It is demonstrated that such a unique integration of heat conduction and heat storage enables the functional separator with attractive abilities to mitigate hotspots and inhibit the growth of lithium dendrites upon the cycling of LMBs.Moreover,pouch cells with the thermal-responsive separator,as well as numerical simulations,verify much enhanced safety and cycle life of LMBs.This work may offer a new conceptual design of intelligent separators that acts as a functional unit encapsulated within a single cell to boost in-situ thermal management,which will help to develop high-safety and energy-dense LMBs.

关键词： lithium metal batteries separators hotspots safety thermal management

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基于多层感知机技术的地铁盾构施工参数预测

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深圳大学学报（理工版） 2024年第1期41卷 50-57页

作者：李文乾吴云桓吴兢业陈治怀谢森林胡安峰中铁十局集团城市轨道交通集团有限公司广东广州511402 浙江大学建筑工程学院浙江杭州310058 滨海和城市岩土工程研究中心浙江杭州310058

在地铁工程建设中,盾构法施工技术已经得到了广泛的应用,盾构掘进参数的合理预测对提高施工安全性及降低操作难度具有较大实际意义.以中国杭州机场快线地铁隧道某标段为工程背景,以隧道直径范围内土层摩擦角、黏聚力、压缩模量、重度以... 详细信息

在地铁工程建设中,盾构法施工技术已经得到了广泛的应用,盾构掘进参数的合理预测对提高施工安全性及降低操作难度具有较大实际意义.以中国杭州机场快线地铁隧道某标段为工程背景,以隧道直径范围内土层摩擦角、黏聚力、压缩模量、重度以及隧道顶部埋深、盾构机预设刀盘转速、推进速度作为输入,以盾构施工时的注浆量、注浆压力、出土量、总推力和刀盘扭矩为输出,建立基于多层感知机的盾构掘进参数预测模型.通过对比不同超参数组合情况下的模型在数据集上的预测表现,挑选出适合于该工程盾构施工参数的预测模型.使用实测数据对模型预测效果进行验证,预测值与实测数据总体变化规律一致,平均误差在20%以内.建立的多层感知机模型预测结果较为合理,具有较好的预测精度,可用于复合地层条件下同类型盾构掘进参数的预测.

关键词：岩土工程多层感知机盾构掘进参数复合地层预测模型 K折验证

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A Mesozoic Pompeii: History of the Jehol Biota's Rise and Fall

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Acta Geologica Sinica(English Edition) 2017年第5期91卷 1893-1903页

作者： SHAO Tiequan ZHANG hu WANG Qi LIU yunhuan ZHANG Yanan College of Earth Science and Resources Chang'an University State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Paleontology Chinese Academy of Sciences

The Jehol fauna was initially represented by a bony fish, concostracan and an insect, as a Lycoptera davidi-Eosestheria-Ephemeropsis trisetalis association,but since the researches of recent decades, the Jehol Biota is now completely different from the past low-diversity, and encompasses a native terrestrial biota that includes many well-preserved vertebrates, invertebrates and plants. There are more than 20 important biological categories, thousands of taphonomically unusual fossils, especially noted for the wide variety of biological tissues. The Jehol Biota has caused a sensation in the world with its wide distribution, large quantity, great variety, fine preservation and detailed information, which records the rise and fall of the numerous taxa, and provides significant evidence for three origins： of birds, eutherian mammals, and angiosperms. The Jehol Biota is a highlight of basic scientific research in China, and we honor it as a world-class fossil treasury and ＂a Mesozoic Pompeii＂.

关键词： geoheritage paleontology Jehol Biota evolutionary origins Jurassic-Cretaceous NortheastAsian region Liaoning province

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Review of Research on Early Cambrian Phosphatized Quadrapyrgites

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Acta Geologica Sinica(English Edition) 2015年第4期89卷 1398-1405页

作者： SHAO Tiequan WANG Qi LIU yunhuan ZHANG Yanan LI Hewei hu Bo LI Chuang DONG Zhiguo ZHANG Hongtao School of Earth Science and Resources Chang'an University Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits MLR State Key Laboratory of Paleobiology and Stratigraphy

The metazoan Quadrapyrgites consists, from proximal to distal ends, of an oral area, a cone, a collar, and an apex from the Early Cambrian Fortunian Stage in Xixiang Zhangjiagou section, southern Shaanxi Province, South China. Three morphological types of the apex, the most characteristic feature of the taxon, are identified from hundreds of Quadrapyrgites specimens. The Quadrapyrgites growth zone is situated at the oral end, where 12 terminal lobes are generated, uplifted, enlarged, and evaginated to form a crest; A one-by-one of crest number from 2 to 13 has been recognized. The unique growth pattern and ontogenetic sequence refute a cubozoan or cycloneuralian affinity for Olivooides and Quadrapyrgites, and instead defend a coronate scyphozoan hypothesis. An embryonic development and ontogenetic sequence with embryo and crest is constructed.

关键词： SSFs Quadrapyrgites Meishucunian Ontogenetic Sequence Shaanxi province

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A New Fortunian Scyphozoa and its Development

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Acta Geologica Sinica(English Edition) 2020年第4期94卷 1303-1304页

作者： QIN Jiachen LIU yunhuan WANG Qi ZHANG hu ZHANG Yanan LIU Mingjin WU Xieting GAO Zhenli ZHANG Xiang School of Earth Science and Resources Chang'an UniversityXi'an 710054China State Key Laboratory of Paleobiology and Stratigraphy Nanjing 210008China

Objective The Cambrian fossil embryos of radial animals are represented by taxa of Olivooides,Pseudooides,Carinachites,hexangulaconulariids(including Hexaconularia and Arthrochites)and Quadrapyrgites.Liu yunhuan established a new genus:Qinscyphus Liu 2017 and reconstructed the general morphology of its hatched stages in 2017;this genus has only one species Qinscyphus necopinus.It was interpreted to be a member of Olivooidae Steiner 2014,and was placed besides crown-group Coronatae within Scyphozoa.In 2018,with the discovery of new fragmentary specimens with oral part preserved,the general morphology of Q.necopimus have been revised;and at the same time,we found a embryo assignable to Q.necopimus.This embryo has oral part that similar to that of the hatched stages of Q.necopimus,indicating that Q.necopinus underwent direet development.

关键词： development. crown revised

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New Small Shelly Fossils(Acanthocassis and Xinlispina Gen.Nov.) from the Fortunian Stage(Early Cambrian) in Southern China

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Acta Geologica Sinica(English Edition) 2015年第5期89卷 1470-1481页

作者： SHAO Tiequan LIU yunhuan WANG Qi ZHANG huaqiao TANG Hanhua CAO Xi HE huahua ZHANG Yanan LI Yuan ZHENG Panlin Zhu Chengyu hu Jiaxi College of Earth Science and Resources Chang’an University State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Key Laboratory of Economic Stratigraphy and Palaeogeography Chinese Academy of Sciences (Nanjing Institute of Geology and Palaeontology)

We describe new material of three-dimensionally phosphatized small shelly fossils Acanthocassis and Xinlispina gen.***.from the Fortunian Stage（early Cambrian） of southern Shaanxi and northern Sichuan Provinces.The new materials allow description of the delicate morphology of these skeletons, and also their skeletogenesis.Acanthocassis and Xinlispina have comparable morphological features： a main branch and radially arranged sub-branches.They differ from each other in many details, e.g., the presence of a single central branch only in Xinlispina, and the presence of small nodes only in Acanthocassis.Acanthocassis cannot be a naked anthopolyp or hydropolyp because of the more-or-less stiffened cuticle and the absence of a mouth.Acanthocassisand Xinlispina differ from coeval sponge spicules and chancelloriid sclerites and rosettes of crossed pedicellariae of echinoderms, and might be cuticular ornaments of animals of unclear affinities.They occur in the first small shelly fossil assemblage zone, and could be adopted as auxiliary fossils for biostratigraphic correlation in southern China.

关键词： small shelly fossils Fortunian Stage Cambrian Xinli Section Xixiang Section Southern China

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Exceptionally Preserved Punctatus triangulicostalis and Its Post-embryonic Development

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Acta Geologica Sinica(English Edition) 2017年第6期91卷 2310-2311页

作者： WANG Qi LIU yunhuan QIN Jiachen ZHANG hu ZHANG Ya'nan SHAO Tiequan ZHANG Ting WEI Ronghao ZHANG Hongze WANG Feng School of Earth Science and Resource Chang'an University State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyCAS

Objective The putative coronatean Punctatus flourished at the beginning of the Cambrian explosion, and is significant in the exploration of the origin and evolution of early life. Liu yunhuan established a new species： Punctatus triangulicostalis Liu, 2006. Two questions remain： how was the special body plan of P. triangulicostalis formed？ How does P. triangulicostalis transform from embryo to the long cylindrical mature individual？ Although the study of Steiner et al. in 2004 involved the above questions, they did not explain them clearly due to the lack of fossil materials at that time. This article aims to consider the above questions based on new information from several rare specimens.

关键词： Exceptionally Preserved Punctatus triangulicostalis Its Post-embryonic Development

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Eopriapulites Sphinx—The Oldest Priapulid-Like Scalidophoran Animal

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Acta Geologica Sinica(English Edition) 2016年第4期90卷 1537-1538页

作者： SHAO Tiequan LIU yunhuan WANG Qi DAI Jun ZHANG Yanan TANG Hanhua LIANG Yongchun CHEN Cheng hu Bo WEI Meng YANG Tingting College of Earth Science and Resources Chang'an University

Objective Priapulid belong to scalidophoran and is located in the Cycloneuralia branch of the Ecdysozoa. It has survived for more than 50 million years, is a real ＂living fossil＂. Priapulid was extremely prosperous in the Cambrian period. It is a small phylum in the modern ocean; only 18 current types have been described, In the Cambrian life, priapulid is one of the most important living organisms in the sea of Cambrian. The abundance of priapulid is generally much higher than that of other animals, or only after the arthropod, and its differentiation is only after the arthropod and the porous sponge. The priapulid of the Early Cambrian in Chengjiang fossil Lagerstatte has 16 basic groups of seven genera.

关键词： show Eopriapulites Sphinx The Oldest Priapulid-Like Scalidophoran Animal oral body

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Xixiang Biota——Another Rare Scientific Window of the Cambrian Explosion

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Acta Geologica Sinica(English Edition) 2016年第3期90卷 1045-1046页

作者： LIU yunhuan WANG Qi SHAO Tiequan DONG Junyan TANG Hanhua ZHANG Yanan JIANG Kaituo hu Bo WANG Zhaojing PANG Guotao MA Yingying FAN Ziyang College of Earth Science and Resources Chang'an University

ObjectiveThe Xixiang biota is a specially preserved micro oryctocoenose discovered in the Lower Cambrian Kuanchuanpu member of Dengying Formation at Zhangjiagou section of Xixiang County in southern Shaanxi Province. The Kuanchuanpu member is a set of neritic carbonate sedimentary formation containing phosphorus and silicon. Its lithology is mainly grey massive fine crystalline, dense massive phosphoruscontaining biolithite and flaggy microcrystallinecrystalline dolomitic limestone. It is in a conformable contact with the underlying upper dolomite member of Dengying Formation and a parallel unconformable contact with the overlying Guojiaba Formation. The fossil assemblages of the Xixiang biota could be compared with the microfbssils from the Lower Cambrian Meishucun Stage, and their age is the Early Cambrian Meishucun Stage.

关键词： Xixiang Biota Another Rare Scientific Window of the Cambrian Explosion

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农村金融创新促进农业产业化发展

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科学学与科学技术管理 2008年第12期29卷 53-57页

作者：郝秀清胡成根仝允桓清华大学经济管理学院北京100084

目前,我国农村经济和政府对农村的扶持手段都经历了较大变化,在农民收入增速放慢的时期,产业化经营可能是农村一条重要的发展新路。但是,在农户养殖产业化中,融资问题使得农民的经营规模难以扩大,企业和农户之间依赖中间经销商融资和销... 详细信息

目前,我国农村经济和政府对农村的扶持手段都经历了较大变化,在农民收入增速放慢的时期,产业化经营可能是农村一条重要的发展新路。但是,在农户养殖产业化中,融资问题使得农民的经营规模难以扩大,企业和农户之间依赖中间经销商融资和销售,由此增大了投入成本。农村金融体系一直难以有效建立,根本原因在于没有很好的担保体系,农户的大部分资产也不能作为抵押品。提出了一种新的农村金融创新方法:将农业企业、银行、保险公司、担保公司和农民结合起来,形成新的经营模式,为农村提供方便的融资渠道,同时减少中间成本,促进产业化发展和农民收入的提高。对这种农村金融创新发挥作用的机理作了讨论,并进一步指出了可能存在的问题和解决办法。

关键词：农村金融创新农业产业化可持续发展

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