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| 1 | Quantitative relationships between vegetation and several pollen taxa in surface soil from North China显示文摘According to the vegetation investigation and pollen analysis of surface samples sampled along a precipitation gradient of the Northeast China Transect (NECT), several pollen taxa, including Pinus, Betula, Quercus, Tilia, Acer, Ulmus, Artemisia, Chenopodiaceae, Gramineae and Cyperaceae, were chosen to make the regression and correlation analyses. The results indicated that there exists a close relationship between vegetation and pollen taxa in surface samples. The regression parameters for ten taxa in the forests in the eastern part of NECT were different from those in the steppes in the western part. Pinus, Betula, Artemisia and Chenopodiaceae, which have large slope and y-intercept terms, were over-representative taxa. Acer, Gramineae and Cyperaceae, which have small slope and y-intercept terms, were under-representative taxa. Quercus, Tilia and Ulmus whose slope terms have negative correlation with y-intercept terms were equi-representative taxa. The pollen taxa with large slope or large y-intercept | LI Yiyin, ZHANG Xinshi & ZHOU Guangsheng1. Department of Urbon and Environmental Sciences, Peking University, Beijing 100871, China 2. Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China 3. School of Urban and Environmental Sciences, Northeast Normal University, Changchun 130024, China Correspondence should be addressed to Li Yiyin | 2000 | Chinese Science Bulletin2000，45，16： | 24 |
| 2 | A Comprehensive Overview of Cyber-Physical Systems: From Perspective of Feedback System显示文摘Cyber-physical systems(CPS) are characterized by integrating cybernetic and physical processes. The theories and applications of CPS face the enormous challenges. The aim of this paper is to provide a latest understanding of this emerging multi-disciplinary methodology. First, the features of CPS are described, and the research progresses are summarized from different components in CPS, such as system modeling,information acquisition, communication, control and security.Each part is also followed by the future directions. Then some typical applications are given to show the prospects of CPS. | Xinping Guan Bo Yang Cailian Chen Wenbin Dai Yiyin Wang | 2016 | IEEE/CAA Journal of Automatica Sinica2016，3，1： | 14 |
| 3 | Evidence of fire use of late Pleistocene humans from the Huanglong Cave, Hubei Province, China显示文摘Since 2004, three excavations have been carried out at a late Pleistocene human fossil site of Huanglong Cave in Yunxi County, Hubei Province of China, which unearthed seven human teeth, dozens of stone tools, mammal fossils and other evidence indicating human activities. During the third excavation in 2006, in the same layer as the human teeth, we found some patches of black materials embed- ded in the deposit. We doubted that this black deposit layer is the remains of burning or even human use of fire at the cave. To further explore the possibility of human fire use at the Huanglong Cave, we examined samples directly taken from the black deposit layer and compared them with samples taken from several places in the cave using three methods: micromorphology, element content determination and deposit temperature analysis. Our results indicate that the contents of carbon element in the black deposit reach 64.59%―73.29%. In contrast, contents of carbon element of the comparative samples from other parts in the cave are only 5.82%―9.49%. The micromorphology analysis of the black deposit samples reveals a plant structure like axial parenchyma, fibrocyte, uniseriate ray and vessel. High-temperature magnetic susceptibility measurements suggest that the stratum possibly underwent a high temperature in the nature. Based on these lab analyses, we are sure that the black layer in the Huanglong Cave is the remains of fire and combustion did occur in the cave 100000 years ago. Taking other evidence of human activities found in the Huanglong Cave into consideration, we believe that the evidence of fire from the Huanglong Cave was caused by the human activities of controlled use of fire. | LIU Wu WU XianZhu LI YiYin DENG ChengLong WU XiuJie PEI ShuWen | 2009 | Chinese Science Bulletin2009，54，2： | 8 |
| 4 | Microstructure Evolution of a 10Cr Heat-Resistant Steel during High Temperature Creep显示文摘The microstructure evolution of a 10Cr ferritic/martensitic heat-resistant steel during creep at 600℃ was investigated in this work.Creep tests demonstrated that the 10Cr steel had higher creep strength than conventional ASME-P92 steel at 600℃.The microstructure after creep was studied by transmission electron microscopy,scanning electron microscopy and electron probe microanalysis.It was revealed that the martensitic laths were coarsened with time and eventually developed into subgrains after 8354 h.Laves phase was observed to grow and cluster along the prior austenite grain boundaries during creep and caused the fluctuation of solution and precipitation strengthening effects,which was responsible for the two slope changes on the creep rupture strength vs rupture time curve.It was also revealed that the microstructure evolution could be accelerated by stress,which resulted in the lower hardness in the deformed part of the creep specimen,compared with the aging part. | Ping Hu Wei Yan Wei Sha Wei Wang Yiyin Shan Ke Yang | 2011 | Journal of Materials Science & Technology2011，27，4： | 8 |
| 5 | Effect of Heat Treatment on Prior Grain Size and Mechanical Property of a Maraging Stainless Steel显示文摘热处理完成,包括答案处理(圣) 和老化处理(在) ,在优先的奥氏体谷物(PAG ) 上尺寸,微观结构和变硬的猛冲的机械性质妈发怒不锈钢被调查。结果显示在 PAG 之间的关系在圣下面并且以条件缩放并且让步力量(sigma_y ) 服从 theHall-Petch 关系。而且,在在为 1 的 1050 deg C 的圣以后, h+cryogenic 对待(CT ) 在为在为 4 h 的 535 deg C 的 8 h+AT 的 -70deg C,测试的钢分别地在 1900 MPa 和 1750 MPa 上显示出它的最终的张力的力量(sigma_b ) 和 sigma_y。 | Kai LIU Yiyin SHAN Zhiyong YANG Jianxiong LIANG Lun LU Ke YANG | 2006 | Journal of Materials Science & Technology2006，22，6： | 7 |
| 6 | Microbial corrosion resistance of a novel Cu-bearing pipeline steel显示文摘Microbiologically influenced corrosion(MIC) is becoming a serious problem for buried pipelines. Developing environmentally friendly strategies for MIC control is increasingly urgent in oil/gas pipeline industry.Copper(Cu) in steels can not only provide aging precipitation strengthening, but also kill bacterium,offering a special biofunction to steels. Based on the chemical composition of traditional X80 pipeline steel, two Cu-bearing pipeline steels(1% Cu and 2% Cu) were fabricated in this study. The microstructure,mechanical properties and antibacterial property against sulphate-reducing bacteria(SRB) and Pseudomonas aeruginosa(P. aeruginosa) were studied. It was found that the novel pipeline steel alloyed by 1%Cu exhibited acicular ferrite microstructure with nano-sized Cu-rich precipitates distribution in the matrix, resulting in better mechanical properties than the traditional X80 steel, and showed good MIC resistance as well. The pitting corrosion resistance of 1% Cu steel in as-aged condition was significantly better than that of X80 steel. A possible antibacterial mechanism of the Cu-bearing pipeline steel was proposed. | Xianbo Shi Wei Yan Dake Xu Maocheng Yan Chunguang Yang Yiyin Shan Ke Yang | 2018 | Journal of Materials Science & Technology2018，34，12： | 7 |
| 7 | Vegetation reconstruction of Bronze Age by using microscopic structure of charcoals显示文摘The microscopic structure of charcoals was determined in two sites of Bronze Age, Chifeng area by using the scanning electronic microscope. The results showed that these charcoals are all timbers of Mongolian oak (Quercus mongolica). It has powerful climatic indicative significance. Based on the assemblage of pollen composition, their eco-climatic index and character of community, the vegetation reconstruction of Bronze Age was obtained. The reconstruction showed that the zonal vegetation was Mongolian oak forest and Chinese pine forest in the loess hills in the Chifeng area, which suggested that the climatic condition was warmer and wetter at that time than present time. | CUI Haiting LI Yiyin HU Jinming YAO Xishen LI Yang | 2002 | Chinese Science Bulletin2002，47，23： | 6 |
| 8 | Pollen flux and vertical dispersion in coniferous and deciduous broadleaved mixed forest in the Changbai Mountains显示文摘The pollen flux in coniferous and deciduous broadleaved mixed forest in the Changbai Mountains is presented in one year's experiments. The results indicate that arboreal pollen percentages are more than 65% and pollen flux is higher than 5000 grain·cm-2·a-1,while less than 2% and lower than 1000 grain·cm-2·a-1 for shrubby pollen,and less than 20% and lower than 3000 grain·cm-1·a-1 for herbaceous pollen for most samples at different heights. The pollen assemblages are similar to those in the samples under 8 m height where Pinus and Ouercus are dominant and followed by the few non-local pollen types,and Fraxinus percentages are high with a few non-local pollen types at 16 m to 32 m height as well as non-local pollen clearly increased at 40 m height. Comparisons between pollen assemblages and vegetation composition suggest that similarities are higher for pollen trap samples than for surface moss samples. | XU QingHai LI YueCong ZHOU LiPing LI YiYin ZHANG ZhenQing LIN FengYou | 2007 | Chinese Science Bulletin2007，52，11： | 6 |
| 9 | Guanxilization or categorization: psychological mechanisms contributing to the formation of the Chinese concept of "us"显示文摘中国社会心理学在面对急速的社会变迁中,需要以变迁与文化的视角来选择研究问题,而中国社会文化中群己关系的社会心理机制,即“我们”概念的形成机制及其转换的可能与条件,正是一个体现着双重视角的基本问题。对这一问题的探讨不仅有助于解释社会凝聚力、群体行动的逻辑,讨论国家与个人、社会与个人、类别与个人的关系;也有助于培植社会转型时期的社会心理资源和社会支持系统,从而促进社会合作。与以往单~机制的分析框架不同,通过对两个个案的讨论,研究提出了一个新的分析框架,即:中国人“我们’概念是在社会情境的启动和价值取向等因素影响之下,经由相互交织的“关系化”与“类别化”双重过程形成的。 | Yang Yiyin | 2009 | Social Sciences in China2009，30，2： | 4 |
| 10 | Effect of Aging on Microstructure and Mechanical Property of 1900 MPa Grade Maraging Stainless Steel显示文摘18%Ni 合金钢提供高力量和坚韧,whileage可硬化或 PH 不锈钢也让好腐蚀 resistance.This 在热处理的 aninvestigation 上糊焦点, newmaraging 的机械性质和微结构开发纯洁的 steel.It 被报导热处理过程应该由 solutiontreatment 并且到达的低温实验法的冷却组成一充分 martensitic 结构,在 813K .This 热处理由老化列在后面导致了最终的张力的 | Kai LIU Yiyin SHAN Zhiyong YANG Jianxiong LIANG Lun LU Ke YANG | 2007 | Journal of Materials Science & Technology2007，23，3： | 4 |
| 11 | Designing a high Si reduced activation ferritic/martensitic steel for nuclear power generation by using Calphad method显示文摘A high Si reduced activation ferritic/martensitic(RAFM) steel for nuclear structure application is successfully designed by using Calphad method. The main designed chemical composition is C 0.18–0.22%, Cr10.0–10.5%, W 1.0–1.5%, Si 1.0–1.3%, V+Ta 0.30–0.45%, and Fe in balance. High Si design brings excellent corrosion resistance, while low activation is advantageous in the nuclear waste processing. The experimental results indicate that the newly designed high Si RAFM steel had full martensitic structure and uniformly distributed fine second phase particles, and exhibited excellent mechanical properties and corrosion resistance. Compared to the P91 steel, this new RAFM steel designed by Calphad method is expected to be a promising candidate used in nuclear power generation, which also provides a new and effective approach to the development of RAFM steel for nuclear application. | Chao Liu Quanqiang Shi Wei Yan Chunguang Shen Ke Yang Yiyin Shan Mingchun Zhao | 2019 | Journal of Materials Science & Technology2019，35，3： | 3 |
| 12 | Theoretical analysis and development of a mechanism with punching device for transplanting potted vegetable seedlings显示文摘Several studies have indicated that potted vegetable seedling transplanting technology can greatly improve the ability of vegetable seedlings to resist cold,flood,drought,saline-alkali and pests.The existing transplanting equipment mostly adopts mechanical,electrical and hydraulic integration technologies with a complex structure and a high cost.To address the problems of the complex structure and low efficiency of existing transplanting equipment,a rotary transplanting mechanism for potted vegetable seedlings was developed through configuration analysis and optimization design.Through kinematic analysis of the transplanting mechanism,optimization design software was developed,and the parameters were optimized.A mechanism was developed for picking,transporting,hole punching and transplanting potted vegetable seedlings.The virtual simulation results showed that the maximum error of attitudes of the transplanting arm is less than 1.19°and that of the hole punching shovel is less than 1.7°.In this study,perforation,seedling harvesting and transplanting experiments were conducted through a bench test.The results showed that the specific trajectory and attitude of the potted vegetable seedlings transplanting mechanism conformed to the requirements of potted vegetable seedling transplantation and the success rate of seedling picking was 92.4%,which verified the correctness and feasibility of the rotary potted vegetable seedling transplanting mechanism. | Maile Zhou Yiyin Shan Xianglei Xue Daqing Yin | 2020 | International Journal of Agricultural and Biological Engineering2020，13，4： | 3 |
| 13 | The impact toughness of a nitride-strengthened martensitic heat resistant steel显示文摘The nitride-strengthened martensitic heat resistant steel is precipitation strengthened only by nitrides.In the present work,the effect of nitride precipitation behavior on the impact toughness of an experimental steel was investigated.Nitrides could hardly be observed when the steel was tempered at 650℃.When the tempering temperature was increased to 700℃ and 750℃,a large amount of nitrides were observed in the matrix.It was surprising to reveal that the impact energy of the half-size samples greatly increased from several Joules to nearly a hundred Joules.The ductile-brittle transition temperature(DBTT) was also discovered to decrease from room temperature to 50℃ when the tempering temperature was increased from 650℃ to 750℃.The nitride precipitation with increasing tempering temperature was revealed to be responsible for the improved impact toughness. | ZHANG WenFeng YAN Wei SHA Wei WANG Wei ZHOU QiangGuo SHAN YiYin YANG Ke | 2012 | Science China(Technological Sciences)2012，55，7： | 2 |
| 14 | Relation among rolling parameters, microstructures and mechanical properties in an acicular ferrite pipeline steel显示文摘 | Wei Wang Wei Yan Lin Zhu Ping Hu Yiyin Shan Ke Yang | 2009 | Materials and Design2009，，9： | 2 |
| 15 | Sodiophilic skeleton based on the packing of hard carbon microspheres for stable sodium metal anode without dead sodium显示文摘The propensity of metallic Na dendrites from uneven electrodeposits and the low Coulombic efficiency due to the inevitable existence of 'dead sodium' are crucial barriers to realizing the Na metal anode.Herein,we report a multifunctional sodiophilic skeleton based on the packing of hard carbon(HC)microspheres for stable sodium metal electrodeposition without 'dead sodium'.Firstly,HC is sodiophilic substrate due to the intrinsic heteroatoms or defects which is a favor for the nucleation of Na.Secondly,silver nanoparticles electroplating on HC(Ag-HC)was adopted to boost the Na diffusion and further regulate the uniform Na metal epitaxial deposition due to well compatibility with AIMD simulation.Finally,the packing of HC microspheres provides the inner space for Na plating.Importantly,it was first found by Cryo-TEM that Na metal deposition in nanoscale is achieved by oriented attachment along[110]direction,leading to the formation of polycrystalline Na metal film on Ag-HC.Such epitaxial deposition can efficiently reduce the formation of 'dead sodium' as revealed by chromatography tests,allowing the high Coulombic efficiency and good cycling stability robust kinetics.Finally,HC-Ag||Na_(3)V_(2)(PO_(4))_(3)full cell with a low negative/positive ratio of 0.6 is firstly achieved and displays good cycling stability.This finding provides a new practical strategy without pre-plating of Na metals and demonstrates a highly reversible polycrystalline Na metal anode toward a high-energy Na-based battery. | Ruoxue Qiu Si Zhao Zhijin Ju Yiyin Huang Lituo Zheng Ruqian Lian Xinyong Tao Zhensheng Hong | 2022 | Journal of Energy Chemistry2022，31，10： | 2 |
| 16 | On Laves phase in a 9Cr3W3CoB martensitic heat resistant steel when aged at high temperatures显示文摘9Cr3W3 CoB steels are developed to serve at the temperature range of 620-650℃,and have been recognized as the most promising martensitic heat-resistant steels for supercritical power plants.Due to the high W and Co contents,the Fe_(2)W Laves phase in such 9Cr3W3 CoB steel possesses some specialties in thermodynamics.In the present research,it was found that even when aged at 800℃in the 9Cr3W3 CoB steel,instead of dissolving,Laves phase formed after 50 h and kept on increasing in size and number density until 1000 h,indicating that the Laves phase was marching for the thermodynamic equilibrium during aging.In this thermodynamic process,the W-rich M_(3)B_(2)borides in as-received steel and M23C6 carbides were revealed to dissolve,supporting the growth of Laves phase.SEM investigation indicates that Laves phase tended to form clusters,and finally grow as a unit bulk Laves phase with an irregular shape.Besides,Laves phase nucleated next to M23C6 carbides and enwrapped them inside at 800℃.In addition,the growth processes of Laves phase and M23C6 carbides were a competitive procedure,the coarsening of M23C6 carbides was prior to the growth of Laves phase at 750℃while the growth of Laves phase was prior to the coarsening of M23C6 carbides at 800℃. | Ye Liang Wei Yan Xianbo Shi Yanfen Li Quanqiang Shi Wei Wang Yiyin Shan Ke Yang | 2021 | Journal of Materials Science & Technology2021，，26： | 1 |
| 17 | Challenge of mechanical properties of an acicular ferrite pipeline steel 显示文摘 | Xiao Furen Liao Bo Shan Yiyin | 2006 | Materials Science and Engineering: A2006，431，12： | 1 |
| 18 | Comparison on strength and toughness behaviors of microalloyed pipeline steels with acicular ferrite and uhrafine ferrite显示文摘 | ZHAO Mingchun YANG Ke SHAN Yiyin | 2003 | Materials Letters2003，57，910： | 1 |
| 19 | Continuous cooling transformation of undeformed and deformed low carbon pipeline steels显示文摘 | Zhao Mingchun Yang Ke Xiao Furen Shan Yiyin | 2003 | Materials Science and Engineering A3552003，，： | 1 |
| 20 | Study of high strength pipeline steels with different microstructures显示文摘 | WANG Wei SHAN Yiyin YANG Ke | 2009 | Materials Science and Engineering A2009，502，12： | 1 |
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