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Spark plasma sintering ofα/β-SiAlON ceramic end mill rods:Electro-thermal simulation,microstructure,mechanical properties,and machining performance

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Journal of Advanced Ceramics 2023年第9期12卷 1777-1792页

作者： Fuzhou Guo Zengbin Yin xuelin li Juntang Yuan School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China Collaborative Innovation Center of High-End Equipment Manufacturing Technology(Nanjing University of Science and Technology) Ministry of Industry and Information TechnologyNanjing 210094China Nanjing Totem Tool Co. Ltd.Nanjing 211215China

Spark plasma sintering(SPS)is a highly efficient method for the preparation ofα/β-SiAlON ***,the rapid preparation of large-scaleα/β-SiAlON ceramic components with reliable mechanical properties is difficult via SPS due to their near-insulating *** this study,high-performanceα/β-SiAlON ceramic end mill rods with large aspect ratios were successfully prepared via *** different types of sintering processes(namely vertical-round-rod(VRR)and horizontal-square-rod(HSR)processes)were developed,and their effects on the phase composition,microstructure,mechanical properties,and machining performance of theα/β-SiAlON ceramic end mill rods were *** electric and temperature field distributions during sintering were studied through an electro–thermal *** simulated and experimental temperature distributions are in good *** contrast to VRR samples,HSR samples with a small axial size show a uniform temperature distribution and satisfactory microstructures within a certain range of dimensions as well as the expected phase composition;furthermore,elongatedβ-SiAlON grains are preferentially oriented in the direction perpendicular to the sintering pressure *** a result,the HSR samples exhibit better mechanical properties and machining performance than the VRR samples.

关键词： α/β-SiAlON ceramics spark plasma sintering(SPS) electro-thermal simulation microstructure mechanical properties orientation

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Development of the Miocene Guangle Carbonate Platform in the South China Sea:Architecture and Controlling Factors

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Acta Geologica Sinica(English Edition) 2021年第1期95卷 177-191页

作者： YANG Zhen li xuelin HUANG Lei WANG liaoliang WU Shiguo ZHANG Xinyuan Guangzhou Marine Geological Survey China Geological SurveyGuangzhou 510075China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Laboratory of Marine Geophysics and Georesource Institute of Deep Sea Science and EngineeringChinese Academy of SciencesSanyaHainan 572000China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdaoShandong 266061China

This study investigates the evolution of the Miocene Guangle carbonate platform(or Triton Horst)of the northwestern South China Sea *** platform is located at a junction area surrounded by Yinggehai basin,Qiongdongnan basin and Zhongjiannan *** and regional geophysical data allow the identification of the morphologic and stratigraphic *** Guangle carbonate platform was initiated on a tectonic uplift during the Early *** early platform was limited at Mesozoic granitic basement,pre-Paleogene sediments localized tectonic uplift and was small extension at the beginning *** during the Middle Miocene,the carbonate buildup flourished,and grow a thrived and thick carbonate succession overlining the whole Guangle *** isolated platforms then united afterward and covered an extensive area of several tens of thousands of square ***,it terminated in the Late *** are the control factors on the initiation,growth and demise of the Guangle carbonate platform?The onset of widespread carbonate deposits largely reflected the Early Miocene transgression linked with early post-rift subsidence and the opening of the South China *** carbonate growth conditions on the Guangle carbonate platform probably resulted from increased inorganic nutrient input derived from the adjacent uplifted mainland,possibly enhanced by deteriorated climatic conditions promoting platform ***,tectonics and terrigenous input could be two main controlling factors on the development of the Guangle carbonate platforms and main evolution stages.

关键词： carbonate platform seismic characteristics tectonic subsidence South China Sea

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In-situ growth of MAX phase coatings on carbonised wood and their terahertz shielding properties

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Journal of Advanced Ceramics 2021年第6期10卷 1291-1298页

作者： Jiaxuan HUANG Hujie WAN Mian li Yiming ZHANG Jianfeng ZHU xuelin li Wenchao SHUI Yao li Xiaomeng FAN Qiye WEN Xu XIAO Qing HUANG School of Shaanxi University of Science and Technology Xi’an 710021China Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Qianwan Institute of CNiTECH Zhongchuangyi RoadHangzhou Bay DistrictNingbo 315336China School of Electronic Science and Engineering State Key Laboratory of Electronic Thin Film and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Poly technical UniversityXi’an 710072China

Electromagnetic interference(EMI)shielding materials have received considerable attention in recent *** EMI shielding effectiveness(SE)of materials depends on not only their composition but also their *** various microstructure prototypes,porous structures provide the advantages of low density and high terahertz wave *** this study,by using carbonised wood(CW)as a template,1-mm-thick MAX@CW composites(Ti2AlC@CW,V2A1C@CW,and Cr2AlC@CW)with a porous structure were fabricated through the molten salt *** MAX@CW composites led to the formation of a conductive network and multilayer interface,which resulted in improved EMI *** average EMI SE values of the three MAX@CW composites were>45 dB in the frequency of 0.6-1.6 *** the composites,V2A1C@CW exhibited the highest average EMI SE of 55 dB.

关键词： MAX phases biomimics electromagnetic interference(EMI) terahertz shielding

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Beauty in the Eye of the Farmer——A produce exhibit at the World Horticulture Expo'99 in Yunnan surprises many with its charm and splendor

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China Today 1999年第9期48卷 58-59页

作者： CHEN ZONGLONG li xuelin

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On Accelerating Development of Yunnan Plateau Characteristic Agriculture

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Asian Agricultural Research 2016年第6期8卷 25-29页

作者： xuelin li Pei GUO Yunnan Academy of Agricultural Sciences China Agricultural University

Yunnan plateau characteristic agriculture is an essential force for increasing farmers' income and promoting prosperity of rural economy. The fundamental position of agriculture should be kept all the time. This paper analyzed practical basis and existing problems in development of Yunnan plateau characteristic agriculture. In line with these problems,it present ideas,main points and objectives of Yunnan plateau characteristic agriculture,and finally came up with recommendations for accelerating development of Yunnan plateau characteristic agriculture.

关键词： Plateau characteristic agriculture Modern agriculture Recommendations Yunnan

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Implications of International Manorial Economy for Development of Characteristic Manorial Economy in Yunnan Plateau Area

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Asian Agricultural Research 2014年第8期6卷 26-34页

作者： Yan LUO Lu FENG Xiaobo DONG Yuan YUAN xuelin li liangzheng CHEN Institute of Agricultural Economics and Information Yunnan Academy of Agricultural Sciences Yunnan Academy of Agricultural Sciences

This paper firstly summarized experience of Vietnam and Taiwan in developing modern agricultural manorial economy. The manorial economy of Vietnam is characterized by intensive and specialized operation and high marketization and wide employment of labors,while the experience of Taiwan can be outlined as " government launching,agricultural association promoting,and farmers acting". Then,it analyzed existing problems of modern agricultural manorial economy in China and opportunities and challenges of characteristic modern agricultural manorial economy in Yunnan plateau area. Finally in line with these problems and combining experience of international manorial economy,it came up with systematic recommendations for healthy and sustainable development of characteristic modern agricultural manorial economy in Yunnan plateau area:(i) perfecting organization leadership,improving planning guidance,and enhancing standardized management;(ii) putting forth effort on innovation of system and mechanism for land,fund and technology,to break bottleneck of manorial economic development;(iii) increasing input and comprehensively building the service support system to promote long-term development of manorial economy.

关键词： Manorial economy Characteristic modern agricultura

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Study on correlation between humic acid and selenium in Kaschin-Beck disease areas

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Journal of Environmental Sciences 1991年第4期3卷 102-107页

作者： Zhang xuelin, Ren Shufen, li Wencheng,Wang Wensheng, Wang Jinda, Wang Wenjun,and Zhang Yuxiachangchun Institute of Geography,Chinese Academy of Sciences,Changchun,China

The relationship between humic acid and selenium content was studied in this research. The results of calculation showed that there is more humic acid and less selenium in Kaschin-Beck disease areas in China. Fulvic acid in soil could increase selenium level in plants. The chemical bonding between humic acid and selenium was observed with an I.R. spectroscope. It was remarkable for the changes of absorption peak and frequency in 1100-1000 cm-1, 900-700 cm-1.

关键词： humic acid selenium Kaschin-Beck disease.

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Defects‑Rich Heterostructures Trigger Strong Polarization Coupling in Sulfides/Carbon Composites with Robust Electromagnetic Wave Absorption

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Nano-Micro Letters 2025年第1期17卷 528-547页

作者： Jiaolong liu Siyu Zhang Dan Qu Xuejiao Zhou Moxuan Yin Chenxuan Wang xuelin Zhang Sichen li Peijun Zhang Yuqi Zhou Kai Tao Mengyang li Bing Wei Hongjing Wu Mengyang li Bing Wei Hongjing Wu School of Physics Xidian UniversityXi’an 710071People’s Republic of China School of Advanced Materials and Nanotechnology State Key Discipline Laboratory of Wide Band Gap Semiconductor TechnologyXidian UniversityXi’an 710071People’s Republic of China School of Microelectronics Xidian UniversityXi’an 710071People’s Republic of China School of Telecommunication Engineering Xidian UniversityXi’an 710071People’s Republic of China MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary School of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China The Ministry of Education Key Laboratory of Micro and Nano Systems forAerospace School of Mechanical EngineeringNorthwestern PolytechnicalUniversityXi’an 710072People’s Republic of China

Defects-rich heterointerfaces integrated with adjustable crystalline phases and atom vacancies,as well as veiled dielectric-responsive character,are instrumental in electromagnetic *** methods,however,constrain their delicate ***,an innovative alternative is proposed:carrageenan-assistant cations-regulated(CACR)strategy,which induces a series of sulfides nanoparticles rooted in situ on the surface of carbon *** unique configuration originates from strategic vacancy formation energy of sulfides and strong sulfides-carbon support interaction,benefiting the delicate construction of defects-rich heterostructures in M_(x)S_(y)/carbon composites(M-CAs).Impressively,these generated sulfur vacancies are firstly found to strengthen electron accumulation/consumption ability at heterointerfaces and,simultaneously,induct local asymmetry of electronic structure to evoke large dipole moment,ultimately leading to polarization coupling,i.e.,defect-type interfacial ***“Janus effect”(Janus effect means versatility,as in the Greek two-headed Janus)of interfacial sulfur vacancies is intuitively confirmed by both theoretical and experimental investigations for the first ***,the sulfur vacancies-rich heterostructured Co/Ni-CAs displays broad absorption bandwidth of 6.76 GHz at only 1.8 mm,compared to sulfur vacancies-free CAs without any dielectric *** defects-rich heterostructures,this one-pot CACR strategy may steer the design and development of advanced nanomaterials,boosting functionality across diverse application domains beyond electromagnetic response.

关键词： Defects-rich heterointerfaces Sulfides Polarization coupling Electromagnetic wave absorption

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An octopamine-specific GRAB sensor reveals a monoamine relay circuitry that boosts aversive learning

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National Science Review 2024年第5期11卷 186-201页

作者： Mingyue Lv Ruyi Cai Renzimo Zhang Xiju Xia xuelin li Yipan Wang Huan Wang Jianzhi Zeng Yifei Xue Lanqun Mao Yulong li State Key Laboratory of Membrane Biology School of Life SciencesPeking University State Key Laboratory of Brain and Cognitive Science Institute of Biophysics Chinese Academy of Sciences PKU-IDG/Mc Govern Institute for Brain Research Yuanpei College Peking University Peking-Tsinghua Center for life Sciences Academy for Advanced Interdisciplinary Studies Peking University Peking University–Tsinghua University–National Institute of Biological Sciences Joint Graduate Program Academy for Advanced Interdisciplinary Studies Peking University Institute of Molecular Physiology Shenzhen Bay Laboratory College of Chemistry Beijing Normal University Chinese Institute for Brain Research

Octopamine（OA）,analogous to norepinephrine in vertebrates,is an essential monoamine neurotransmitter in invertebrates that plays a significant role in various biological functions,including olfactory associative ***,the spatial and temporal dynamics of OA in vivo remain poorly understood due to limitations associated with the currently available methods used to detect *** overcome these limitations,we developed a genetically encoded GPCR activation-based（GRAB） OA sensor called *** sensor is highly selective for OA and exhibits a robust and rapid increase in fluorescence in response to extracellular *** GRABOA1.0,we monitored OA release in the Drosophila mushroom body（MB）,the fly's learning center,and found that OA is released in response to both odor and shock stimuli in an aversive learning *** OA release requires acetylcholine（ACh） released from Kenyon cells,signaling via nicotinic ACh ***,we discovered that OA amplifies aversive learning behavior by augmenting dopamine-mediated punishment signals via Octβ1R in dopaminergic neurons,leading to alterations in synaptic plasticity within the ***,our new GRABOA1.0sensor can be used to monitor OA release in real time under physiological conditions,providing valuable insights into the cellular and circuit mechanisms that underlie OA signaling.

关键词： octopamine dopamine GRAB sensor learning and memory

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生态产品价值实现模式及形成机理——基于多类型样本的对比分析

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资源科学 2022年第11期44卷 2303-2314页

作者：朱新华李雪琳河海大学公共管理学院南京211100

解析生态产品价值实现模式的形成机理是贯彻落实生态文明建设理念的重要议题。现有研究对生态产品价值实现模式的探讨主要集中在类型划分与个案研究,对其模式形成机理的考察缺乏整体性的分析框架。本文以物品的排他性和竞争性为依据,归... 详细信息

解析生态产品价值实现模式的形成机理是贯彻落实生态文明建设理念的重要议题。现有研究对生态产品价值实现模式的探讨主要集中在类型划分与个案研究,对其模式形成机理的考察缺乏整体性的分析框架。本文以物品的排他性和竞争性为依据,归纳了生态产品价值实现的4种基本模式,并结合4个典型案例进行验证,在此基础上从生态资源禀赋、制度环境和参与主体维度阐释了生态产品价值实现模式的形成机理。研究发现:(1)以排他性和竞争性为主线,生态产品可划分为纯公共生态产品、公共资源产品、生态俱乐部产品和私人生态产品,生态产品的不同属性意味着其价值实现模式的差异性;(2)不同地区的生态系统特征影响生态资源的利用方式,政治、市场、文化等制度环境的差异性影响生态产品供给的过程与结果,参与主体的类型以及各自的能力与意愿影响生态产品价值实现方式的选择,三者共同驱动着生态产品价值实现差异化模式的形成;(3)一种生态产品可能同时采用多种价值实现模式,随着技术与制度的创新,生态产品属性的变化会带来价值实现模式的相应调整。为了促进“绿水青山”向“金山银山”的转化,需要从生态资源保护与挖掘、制度环境优化、多元主体参与等方面着手实现生态产品价值。

关键词：生态产品价值实现模式公共物品形成机理

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