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Temperature Gradient Induced Orientation Change of Bi Grains in Sn–Bi57–Ag0.7 Solder Joint

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Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1184-1194页

作者： yinbo chen Zhaoqing Gao Zhi-Quan Liu Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Materials Science and Engineering Dalian University of TechnologyDalian 116024China Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

Sn-Bi-X solders are widely used in electronic packaging ***,thermomigration(TM)behaviors of Sn-BiX solder joints and the orientations change of Bi grains under the temperature gradient are rarely *** this study,Sn-Bi57-Ag0.7/Cu solder joints were used to conduct a TM test under a temperature gradient of 625℃/cm for 400 h,and an isothermal aging test at 85℃was also conducted for *** microstructural evolution of Sn-Bi-X solder joints after reflow,TM and isothermal aging were analyzed by scanning electron microscopy(SEM),transmission electron microscopy(TEM)and electron probe microanalysis(EPMA).The results indicated that the Sn/Bi areal ratio after TM did not change significantly whether at the hot end(from 46.78%/52.12%to 50.90%/48.78%)or at the cold end(from 50.25%/49.64%to 48.71%/51.16%)compared with that of as-reflowed samples due to the insufficient thermal *** thickness of intermetallic compound(IMC)after TM at hot end(2.49μm)was very close to that of the IMC at cold end(2.52μm),which was also close to that of the aged *** addition,the preferred orientations of Sn and Bi grains in different Sn–Bi–Ag solder joints resulting from different conditions(reflow,TM and isothermal aging)were characterized by electron backscatter diffraction(EBSD).The obtained results demonstrated that both Sn and Bi grains had no preferred orientation whether after reflowor isothermal aging,while the orientation of Bi grains of the sample after TM changed from random direction to c-axis([0001]direction)parallel to the heat *** 3 Sn could hinder the change of orientation of Bi grains under the temperature gradient,and the corresponding mechanism was also systematically *** study firstly revealed the orientation change of Bi grains under the temperature gradient,which would have a profound guiding significance for enhancing the reliabilities of Sn–Bi–Ag solder joints.

关键词： Sn–Bi–Ag solder Grain orientation Temperature gradient Aging Ag3Sn

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新型电压自均衡开关电容多电平逆变器

电机与控制学报 2024年第3期28卷 157-168页

作者：李宋邵云鹏叶满园陈银波刘文芳邢瑞新喻生铭华东交通大学电气与自动化工程学院江西南昌330013

为了使用更少的器件实现更多的输出电平,同时解决传统多电平逆变器开关器件在高电压下工作时,其电压应力较大,容易损坏的问题,提出一种新型单电源开关电容多电平逆变器拓扑。该开关电容逆变器拓扑通过研究开关电容技术与级联H桥逆变器... 详细信息

为了使用更少的器件实现更多的输出电平,同时解决传统多电平逆变器开关器件在高电压下工作时,其电压应力较大,容易损坏的问题,提出一种新型单电源开关电容多电平逆变器拓扑。该开关电容逆变器拓扑通过研究开关电容技术与级联H桥逆变器的结合,采用脉宽调制的方式经过逻辑组合进行调制,实现了高效的电压增益和电平输出。在保证电容电压自均衡的前提下,仅使用单个直流电源输入,产生三倍电压增益的七电平输出。然后,为了进一步拓展该逆变器的应用范围,介绍所提逆变器的扩展结构,并简要分析其工作模式。同时与其他类似拓扑进行对比,证明该拓扑优势。最后为了验证理论分析的正确性,设计了仿真和实验样机,对逆变器的性能进行了详细测试。

关键词：开关电容单输入基本单元电压应力电容电压自均衡

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基于功率开关-二极管基本单元多电平逆变器及其功率均衡调制策略研究

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电机与控制学报 2024年第1期28卷 152-163页

作者：叶满园喻生铭刘文芳邵云鹏陈银波邢瑞新华东交通大学电气与自动化工程学院江西南昌330013

针对级联H桥型多电平逆变器开关器件随逆变器输出电平数增加显著增多的问题,提出一种以功率开关器件-二极管为基本单元的新型多电平逆变器。该逆变器仅使用较少开关器件即可实现高质量电平输出,且该拓扑开关损耗低、效率高,不仅易于扩... 详细信息

针对级联H桥型多电平逆变器开关器件随逆变器输出电平数增加显著增多的问题,提出一种以功率开关器件-二极管为基本单元的新型多电平逆变器。该逆变器仅使用较少开关器件即可实现高质量电平输出,且该拓扑开关损耗低、效率高,不仅易于扩展还能有效避免级联单元间电流倒灌等问题。针对传统正负反向层叠载波调制策略调制下逆变器存在级联单元间输出功率不均衡的问题,在传统调制策略基础上推导分析区域功率,提出了一种基于部分载波循环的功率均衡调制策略,并验证了载波循环规律的普适性,所提调制策略能在保持输出电压波形质量不变的情况下,载波仅变换2(n-1)次即可在nT_(o)/2内实现级联单元输出功率均衡以及开关损耗平均分配,并提高电源利用率。最后搭建两单元七电平逆变器实验平台对所提调制策略进行了实验验证。

关键词：新型多电平逆变器开关损耗电流倒灌载波循环区域功率重组功率均衡

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Physical Layer Encryption of OFDM-PON Based on Quantum Noise Stream Cipher with Polar Code

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China Communications 2024年第3期21卷 174-188页

作者： Xu yinbo Gao Mingyi Zhu Huaqing chen Bowen Xiang Lian Shen Gangxiang Jiangsu Engineering Research Center of Novel Optical Fiber Technology and Communication Network Suzhou Key Laboratory of Advanced Optical Communication Network Technologythe School of Electronic and Information EngineeringSoochow UniversityNo.1 Shizi StreetSuzhou 215006China

Orthogonal frequency division multiplexing passive optical network(OFDM-PON) has superior anti-dispersion property to operate in the C-band of fiber for increased optical power budget. However,the downlink broadcast exposes the physical layer vulnerable to the threat of illegal eavesdropping. Quantum noise stream cipher(QNSC) is a classic physical layer encryption method and well compatible with the OFDM-PON. Meanwhile, it is indispensable to exploit forward error correction(FEC) to control errors in data transmission. However, when QNSC and FEC are jointly coded, the redundant information becomes heavier and thus the code rate of the transmitted signal will be largely reduced. In this work, we propose a physical layer encryption scheme based on polar-code-assisted QNSC. In order to improve the code rate and security of the transmitted signal, we exploit chaotic sequences to yield the redundant bits and utilize the redundant information of the polar code to generate the higher-order encrypted signal in the QNSC scheme with the operation of the *** experimentally demonstrate the encrypted 16/64-QAM, 16/256-QAM, 16/1024-QAM, 16/4096-QAM QNSC signals transmitted over 30-km standard single mode fiber. For the transmitted 16/4096-QAM QNSC signal, compared with the conventional QNSC method, the proposed method increases the code rate from 0.1 to 0.32 with enhanced security.

关键词： physical layer encryption polar code quantum noise stream cipher

Influence of External Interface Normal Stress on the Growth of Cu-Sn IMC During Aging

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Acta Metallurgica Sinica(English Letters) 2020年第10期33卷 1388-1396页

作者： Changchang Wang yinbo chen Zhi-Quan Liu Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shenzhen Institute of Advanced Electronic Materials Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

A U-shape clamp was designed to apply stress perpendicular to the interface of Cu/Sn/Cu solder joints,and its influence on the growth behavior of Cu-Sn intermetallic compound(IMC)during thermal aging at 150℃ was *** results show that compared with the sample at general stress-free state,the growth rate of IMC under compression is faster,while that under tension is ***,the interface between IMC and Sn is smoother under compressive stress,and the corresponding IMC grains are smaller and more uniform than that under tensile *** to the growth kinetic analysis,the growth of IMC under general,compressive and tensile states is all controlled by the combination of grain boundary diffusion and volume diffusion with a similar growth exponent(n≈0.4).However,external stress can affect the Ostwald ripening process of grain growth,causing a change of grain size and grain boundary density in the IMC *** a result,the IMC growth behavior at the interface of the solder joint will be affected by the applied external normal stress.

关键词： Cu-Sn IMC Growth behavior External stress effect Isothermal aging

Discontinuous phase diagram of amorphous carbons

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National Science Review 2024年第4期11卷 164-171页

作者： yinbo Zhu ZhouYu Fang ZhongTing Zhang HengAn Wu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences

The short-range order and medium-range order of amorphous carbons demonstrated in experiments allow us to rethink whether there exist intrinsic properties hidden by atomic disordering. Here we presented six representative phases of amorphous carbons（0.1–3.4 g/cm3）, namely, disordered graphene network（DGN）, high-density amorphous carbon（HDAC）, amorphous diaphite（a-DG）, amorphous diamond（a-D）, paracrystalline diamond（p-D）, and nano-polycrystalline diamond（NPD）, respectively, classified by their topological features and microstructural characterizations that are comparable with experiments. To achieve a comprehensive physical landscape for amorphous carbons, a phase diagram was plotted in the sp3/sp2versus density plane, in which the counterintuitive discontinuity originates from the inherent difference in topological microstructures, further guiding us to discover a variety of phase transitions among different amorphous carbons. Intriguingly, the power law, log（sp3/sp2） ∝ ρn, hints at intrinsic topology and hidden order in amorphous carbons, providing an insightful perspective to reacquaint atomic disorder in non-crystalline carbons.

关键词： amorphous carbons disordered carbons phase diagram microstructural topology phase transition

Synthesis and Insecticidal Evaluation of Novel Phthalic Diamides Containing 1,2,3-Triazoles via Click Reaction

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Chinese Journal of Chemistry 2014年第7期32卷 592-598页

作者： yinbo chen Youxin Xiao Xusheng Shao Xiaoyong Xu Zhong Li Shanghai Key Laboratory of Chemical Biology School of PharmacyEast China University of Science and TechnologyShanghai 200237China

A series of novel phthalic diamide derivatives containing 1,2,3-triazole moiety were synthesized using one-pot click chemistry approach and characterized by ^(1)H NMR and *** insecticidal activity against armyworm(Mythimna separata),Tetranychus cinnabarinus and cowpea aphid(Aphis craccivora)was *** 4Ⅱ-a and 4Ⅱ-i showed 50%insecticidal activity against armyworm(Mythimna separata)at the concentration of 4 mg/L and one-third of the compounds had moderate activity against Tetranychus cinnabarinus at 500 mg/L.

关键词： phthalic diamide 1,2,3-triazole click chemistry synthesis bioactivity

Establishing VIGS and CRISPR/Cas9 techniques to verify RsPDS function in radish

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Journal of Integrative Agriculture 2024年第5期23卷 1557-1567页

作者： Jiali Ying Yan Wang Liang Xu Tiaojiao Qin Kai Xia Peng Zhang yinbo Ma Keyun Zhang Lun Wang Junhui Dong Lianxue Fan Yuelin Zhu Liwang Liu National Key Laboratory of Crop Genetics&Germplasm Enhancement and Utilization/Key Laboratory of Horticultural Crop Biology and Genetic Improvement(East China)of Ministry of Agriculture and Rural Affairs/College of Horticulture Nanjing Agricultural UniversityNanjing210095China College of Horticulture and Landscape Architecture Yangzhou UniversityYangzhou 225009China College of Life Sciences Nanjing Agricultural UniversityNanjing 210095China

Virus-induced gene silencing(VIGS)and clustered regularly interspaced short palindromic repeats/CRISPR-associated protein(CRISPR/Cas)systems are effective technologies for rapid and accurate gene function verification in modern plant ***,the investigation of gene silencing and editing in radish remains *** this study,a bleaching phenotype was generated through the knockdown of RsPDS using tobacco rattle virus(TRV)-and turnip yellow mosaic virus(TYMV)-mediated gene silencing *** TYMV-mediated gene silencing efficiency was higher than the TRV-based VIGS system in *** expression level of RsPDS was significantly inhibited using VIGS in'NAU-067'radish *** rootless seedlings of‘NAU-067'were infected with Agrobacterium rhizogenes using the 2300GN-Ubi-RsPDS-Cas9 vector with two target *** adventitious roots were blue with GUs staining,and four of these adventitious roots were edited at target sequence 1 of the RsPDS gene as indicated by Sanger ***,albino lines were generated with ***-mediated transformation of radish *** base substitutions and three base deletions occurred at target sequence 2 in Line 1,and three base insertions and three base substitutions occurred at target sequence 1 in Line *** study shows that VIGS and CRISPR/Cas9 techniques can be employed to precisely verify the biological functions of genes in radish,which will facilitate the genetic improvement of vital horticultural traits in radish breeding programs.

关键词： Raphanus sativus L. VIGS CRISPR/Cas9 Agrobacterium rhizogenes A.tumefaciens RsPDS

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瑞卢戈利的合成工艺

中国医药工业杂志 2022年第7期53卷 962-968页

作者：李敏洪碧波陈寅波胡亮刘相奎中国医药工业研究总院创新药物与制药工艺国家重点实验室上海201203

以4-硝基苯基乙酸(5)和乙酸酐反应得1-(4-硝基苯基)丙酮(6),6先后与氰乙酸乙酯、硫经缩合、环合得2-氨基-4-甲基-5-(4-硝基苯基)噻吩-3-甲酸乙酯(7),7经氯甲酸丁酯酰化得2-丁氧基酰胺基-4-甲基-5-(4-硝基苯基)-噻吩-3-甲酸乙酯(8),8经2... 详细信息

以4-硝基苯基乙酸(5)和乙酸酐反应得1-(4-硝基苯基)丙酮(6),6先后与氰乙酸乙酯、硫经缩合、环合得2-氨基-4-甲基-5-(4-硝基苯基)噻吩-3-甲酸乙酯(7),7经氯甲酸丁酯酰化得2-丁氧基酰胺基-4-甲基-5-(4-硝基苯基)-噻吩-3-甲酸乙酯(8),8经2,6-二氟苄氯取代得2-[(2,6-二氟苄基)丁氧基酰胺基]-4-甲基-5-(4-硝基苯基)噻吩-3-甲酸乙酯(9),9与N-溴代丁二酰亚胺溴化,再经二甲胺取代得2-[(2,6-二氟苄基)丁氧基酰胺基]-4-二甲胺基甲基-5-(4-硝基苯基)噻吩-3-甲酸乙酯(11),11经氢氧化钾水解得2-[(2,6-二氟苄基)丁氧基酰胺基]-4-二甲胺基甲基-5-(4-硝基苯基)噻吩-3-甲酸(12),12与3-氨基-6-甲氧基哒嗪缩合,再经甲醇钠环合得1-(2,6-二氟苄基)-5-二甲胺基甲基-3-(6-甲氧基哒嗪-3-基)-6-(4-硝基苯基)噻吩并[2,3-d]嘧啶-2,4(1H,3H)-二酮(14),14经钯炭加氢还原得6-(4-氨基苯基)-1-(2,6-二氟苄基)-5-二甲胺基甲基-3-(6-甲氧基哒嗪-3-基)噻吩并[2,3-d]嘧啶-2,4(1H,3H)-二酮(15),最后15经氯甲酸苯酯取代,再与甲氧氨盐酸盐反应得瑞卢戈利,总收率为22.9%(以5计)。

关键词：瑞卢戈利促性腺激素释放激素拮抗剂合成工艺