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Wafer-scale carbon-based CMOS PDK compatible with siliconbased VLSI design flow

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Nano Research 2024年第8期17卷 7557-7566页

作者： Minghui Yin Haitao Xu Yunxia You Ningfei Gao Weihua Zhang Hongwei Liu Huanhuan Zhou Chen Wang lian-mao Peng Zhiqiang Li Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China State Key Lab of Fabrication Technologies for Integrated Circuits Beijing 100029China Beijing Hua Tan Yuan Xin Electronics Technology Co. Ltd.Beijing 101399China Institute of Carbon-based Thin Film Electronics Peking UniversityShanxi 030012China Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics School of ElectronicsPeking UniversityBeijing 100871China

Carbon nanotube field-effect transistors(CNTFETs)are increasingly recognized as a viable option for creating high-performance,low-power,and densely integrated circuits(ICs).Advancements in carbon-based electronics,encompassing materials and device technology,have enabled the fabrication of circuits with over 1000 gates,marking carbon-based integrated circuit design as a burgeoning field of research.A critical challenge in the realm of carbon-based very-large-scale integration(VLSI)is the lack of suitable automated design methodologies and infrastructure *** this study,we present the development of a waferscale 3μm carbon-based complementary metal-oxide-semiconductor(CMOS)process design kit(PDK)(3μm-CNTFETs-PDK)compatible with silicon-based Electronic Design Automation(EDA)tools and VLSI circuit design *** proposed 3μm-CNTFETs-PDK features a contacted gate pitch(CGP)of 21μm,a gate density of 128 gates/mm^(2),and a transistor density of 554 transistors/mm^(2),with an intrinsic gate delay around 134 *** of the 3μm-CNTFETs-PDK was achieved through the successful design and tape-out of 153 standard cells and 333-stage ring oscillator *** the carbon-based PDK and a silicon-based design platform,we successfully implemented a complete 64-bit static random-access memory(SRAM)circuit system for the first time,which exhibited timing,power,and area characteristics of clock@10 kHz,122.1μW,3795μm×2810μ*** research confirms that carbon-based IC design can be compatible with existing EDA tools and silicon-based VLSI design flow,thereby laying the groundwork for future carbon-based VLSI advancements.

关键词： carbon nanotube field-effect transistors(CNTFETs) complementary metal-oxide-semiconductor(CMOS) process design kit(PDK) wafer-scale very-large-scale integration(VLSI)

基于自主航行系统的无人船海上航迹多目标控制技术研究

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Suppression of leakage current in carbon nanotube field-effect transistors

科学与信息化 2024年第2期 40-42页

作者：毛炼刘鑫中海油安全技术服务有限公司湛江分公司广东湛江 524057

航迹控制存在累积跟踪控制误差较高的问题,容易导致无人船发生安全事故,因此,应对基于自主航行系统的无人船海上航迹多目标控制技术加以研究.本文基于自主航行系统定位无人船,根据系统采集的海域环境信息规划无人船海上航迹,设计由动态... 详细信息

航迹控制存在累积跟踪控制误差较高的问题,容易导致无人船发生安全事故,因此,应对基于自主航行系统的无人船海上航迹多目标控制技术加以研究.本文基于自主航行系统定位无人船,根据系统采集的海域环境信息规划无人船海上航迹,设计由动态神经网络结合扰动观测器的复合控制器,实现无人船海上航迹多目标跟踪控制.实验结果表明,研究技术可以实时跟踪控制无人船海上航迹,提高无人船航行的安全性,且在多目标跟踪控制误差上具有显著优势.

关键词：自主航行系统无人船海上航迹多目标控制技术

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Nano Research 2021年第4期14卷 976-981页

作者： Lin Xu Chenguang Qiu lian-mao Peng Zhiyong Zhang Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics Peking UniversityBeijing 100871China

Carbon nanotube field-effect transistor(CNT FET)has been considered as a promising candidate for future high-performance and low-power integrated circuits(ICs)applications owing to its ballistic transport and excellent immunity to short channel effects(SCEs).Still,it easily suffers from the ambipolar property,and severe leakage current at off-state originated from gate-induced drain leakage(GIDL)in CNT FETs with small *** some modifications on device structure have been experimentally demonstrated to suppress the leakage current in CNT FETs,there is still a lack of the structure with excellent scalability,which will hamper the development of CNT FETs toward a competitive technology ***,we explore how the device geometry design affects the leakage current in CNT FETs,and then propose the possible device structures to suppress off-state current and check their availability through the two-dimensional(2D)TCAD *** all the proposed structures,the L-shaped-spacer CNT FET exhibits significantly suppressed leakage current and excellent scalability down to sub-50 nm with a simple self-aligned gate *** to the simulation results,the 50 nm gate-length L-shaped-spacer CNT FET exhibits an off-state current as low as approximately 1 nA/μm and an on-current as high as about 2.1 mA/μm at a supply voltage of-1 V and then can be extended as a universal device structure to suppress leakage current for all the narrow-bandgap semiconductors based FETs.

关键词： carbon nanotube field-effect transistor leakage current TCAD simulation narrow-bandgap semiconductor

压力性损伤患者非正式照顾者知信行量表的编制及信效度检验

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中南大学学报（医学版） 2024年第6期49卷 972-980页

作者：陆晶杨璇石双姣盛春毛莲龚丽娜中南大学湘雅三医院护理部长沙410013 中南大学湘雅三医院心血管内科长沙410013 中南大学湘雅医院皮肤科长沙410008 中南大学湘雅三医院血液内科长沙410013 中南大学湘雅三医院胃肠外科长沙410013 中南大学湘雅三医院神经内科重症监护室长沙410013

目的:压力性损伤(pressure injury,PI)患者的非正式照顾者的认知及照顾行为水平暂缺科学性测量工具,本研究拟编制PI患者非正式照顾者知信行量表,并对其进行信效度检验。方法:以知信行理论为框架,结合相关文献与专家头脑风暴,拟定量表初... 详细信息

目的:压力性损伤(pressure injury,PI)患者的非正式照顾者的认知及照顾行为水平暂缺科学性测量工具,本研究拟编制PI患者非正式照顾者知信行量表,并对其进行信效度检验。方法:以知信行理论为框架,结合相关文献与专家头脑风暴,拟定量表初始条目池;经过德尔菲专家函询、预调查,形成初始量表。于2023年4至10月便利选取中南大学湘雅三医院住院部及其合作社区、长沙红枫康复医院的PI患者非正式照顾者进行调查,第1次纳入186名、第2次纳入213名进行量表项目分析及信效度检验;间隔3周,随机抽取已调查的20名重测,检验量表的重测信度。结果:PI患者非正式照顾者知信行量表共3个维度,19个条目。总量表内部一致性克龙巴赫α系数为0.916,量表所有条目水平的内容效度指数(item level-content validity index,I-CVI)为0.826~1.000,平均量表水平的内容效度指数(scale level-content validity index/average,S-CVI/Ave)为0.94。探索性因子分析提取3个公因子,累计方差贡献率为64.643%。验证性因子分析显示χ~2/df=2.54,近似误差的均方根(root mean square error of approximation,RMSEA)=0.085,比较拟合指数(comparative fit index,CFI)=0.920,标准化均方根残差(standardized root mean square residual,SRMR)=0.059,模型与数据整体适配良好。结论:PI患者非正式照顾者知信行量表具有较好的信度和效度,可用于非正式照顾者PI知信行水平的评估。

关键词：压力性损伤非正式照顾者知信行量表信度效度

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Current sustainability and electromigration of Pd,Sc and Y thin-films as potential interconnects

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Nano-Micro Letters 2010年第3期2卷 184-189页

作者： Yong Yang Shengyong Xu Sishen Xie lian-mao Peng Key Laboratory for the Physics and Chemistry of Nanodevices and Department of ElectronicsPeking University Institute of Physics Chinese Academy of Sciences

The progress on novel interconnects for carbon nanotube(CNT)-based electronic circuit is by far behind the remarkable development of CNT-field effect *** Cu interconnect material used in current integrated circuits seems not applicable for the novel interconnects,as it requires electrochemical deposition followed by chemical-mechanical *** report our experimental results on the failure current density,resistivity,electromigration effect and failure mechanism of patterned stripes of Pd,Sc and Y thin-films,regarding them as the potential novel *** Pd stripes have a failure current density of(8~10)×106 A/cm^2(MA/cm^2),and they are stable when the working current density is as much as 90% of the failure current ***,they show a resistivity around 210 μΩ·cm,which is 20 times of the bulk value and leaving room for *** to Pd,the Sc stripes have a similar resistivity but smaller failure current density of 4~5 MA/cm^2.Y stripes seem not suitable for interconnects by showing even lower failure current density than that of Sc and evidence of *** comparison,Au stripes of the same dimensions show a failure current density of 30 MA/cm^2 and a resistivity around 4 μΩ·cm,making them also a good material as novel interconnects.

关键词： Carbon nanotube-based field effect transistors Carbon nanotube-based circuit Interconnects Current density Electromigration Resistivity

基层养老机构护理员认知障碍症照护胜任感现状及影响因素

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护理研究 2024年第15期38卷 2782-2786页

作者：张梅黄伶智尹淙禹李九红毛莲中南大学湘雅护理学院湖南410013 中南大学湘雅二医院中南大学湘雅三医院

目的:了解湖南省县乡村公办养老机构护理员认知障碍症照护胜任感现状及影响因素,为养老护理员的配置、培训与管理提供参考。方法:采用一般资料调查表、Utrecht工作投入量表、对老年人的态度量表、护理员认知障碍症照护胜任感量表、疏于... 详细信息

目的:了解湖南省县乡村公办养老机构护理员认知障碍症照护胜任感现状及影响因素,为养老护理员的配置、培训与管理提供参考。方法:采用一般资料调查表、Utrecht工作投入量表、对老年人的态度量表、护理员认知障碍症照护胜任感量表、疏于照顾情况量表对湖南省3个地州市县乡村公办养老机构的469名养老护理员进行问卷调查。结果:养老机构编制床位与养老护理员配置比为17.94∶1,实时入住人员与养老护理员比为10.31∶1。养老护理员认知障碍症照护胜任感得分为(48.20±9.95)分。值班模式、工作满意度、工作投入和对老年人的态度是养老机构护理员认知障碍症照护胜任感的影响因素。结论:湖南省县乡村公办养老机构护理员配置比例相对较低;护理员认知障碍症照护胜任感处于中等水平;建议加强养老护理员知识和人文的培养,采取多种举措提高护理员的工作投入和工作满意度,提升认知障碍症照护胜任感,从而提高照护质量。

关键词：养老护理员工作投入对老年人态度认知障碍护理

Carbon nanotube network film-based ring oscillators with sub l O-ns propagation time and their applications in radio-frequency signal transmission

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Nano Research 2018年第1期11卷 300-310页

作者： Yingjun Yang Li Ding Hengjia Chen Jie Han Zhiyong Zhang lian-mao Peng Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics Peking University Beijing 100871 China

We have fabricated top-gated ambipolar field-effect transistors （FETs） based on solution-derived carbon nanotube （CNT） network films, and then constructed inverters and ring oscillators （ROs） that can work under supply voltages as low as 0.2 V owing to the high uniformity of the devices. Significant improvements were achieved in the performance of these CNT-based ambipolar FETs and CMOS-like circuits by scaling down the gate length of the CNT FETs and optimizing the device structure and RO layout. In particular, the optimized five-stage RO is shown to present a record high oscillation frequency of up to 17.4 MHz with a propagation time of 5.6 ns at a 12-V working voltage. The CNT film-based ROs were used as carrier-wave generators in radio-frequency systems to demonstrate a complete signal transmission process. These results suggest that CNT thin film-based FETs and integrated circuits may soon find their way to radio-frequency applications with a frequency band of 13.56 MHz.

关键词： carbon nanotube nanoelectronics field-effect transistors radio-frequency ring oscillator

First-Principle Calculations of the MgYA_4(A=Co and Ni)Phase with AuBe_5-Type Structure

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Acta Metallurgica Sinica(English Letters) 2015年第11期28卷 1326-1331页

作者： Na Wang Wei-Bing Zhang Bi-Yu Tang En-Jie He mao-lian Zhang College of Electrical and Electronic Engineering Anhui Science and Technology University School of Physics and Electronic Science Changsha University of Science and Technology School of Chemistry and Chemical Engineering Guangxi University

First-principles calculations have been performed to study the structural, mechanical and magnetic properties of the MgYCo4 and MgYNi4 phases in AuBes-type structure. The obtained values of cohesive energy as well as formation energy prove that the MgYCo4 and MgYNi4 phases have a good combination of structural stability and alloying ability, which is also supported by electronic structure. It is found that the magnetic moment of the MgYCo4 phase is 19.06 ktB per unit cell mainly owed to the 3d state of Co atom, and the MgYNi4 phase exhibits no magnetism. Both the trigonal shear constant C44 and the shear modulus G of the MgYNi4 phase are larger than those of the MgYCo4 phase. Plasticity of alloys has been estimated by the C11-C12 and Young＇s modulus E, and C12-C44, shear to bulk modulus ratio G/B and Poisson＇s ratio v have been studied to predict the ductility of alloys. According to the calculated results, the MgYCo4 phase has better plasticity as well as ductility, compared with the MgYNi4 phase.

关键词： Ductility Plasticity Elastic modulus Magnesium alloy Electrical and magnetic properties

海洋强国背景下船海学科研究生实践课程教学的探索与实践

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黑龙江教育（高教研究与评估） 2024年第10期 95-97页

作者：陈占阳桂洪斌杨连茂哈尔滨工业大学(威海) 山东威海264209

近年来,船舶与海洋工程专业作为一个跟随国际形式不断发展变化的热门专业,专业内的创新与实验教育涌现出一系列新的成果,但也从中暴露出一些问题。为此,根据近几年教学和科研工作经验,对海洋强国背景下培养具备创新精神、创新能力、创... 详细信息

近年来,船舶与海洋工程专业作为一个跟随国际形式不断发展变化的热门专业,专业内的创新与实验教育涌现出一系列新的成果,但也从中暴露出一些问题。为此,根据近几年教学和科研工作经验,对海洋强国背景下培养具备创新精神、创新能力、创新意识的船海学科拔尖人才的重要性进行了详细阐述,并结合学科研究生主干课程,对课程的教学内容、教学方法、教学手段进行了深入改革,开展了实践教学、案例教育的探索与实践,并就实践教学过程中所取得的工作成效进行了深度剖析。这一改革后的教学方式不仅将为船海学科的研究生教学提供参考,还能为其他专业研究生培养提供参考。

关键词：海洋强国船舶与海洋工程研究生实践教学