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Electrochemical migration behavior of Ag-plated Cu-filled electrically conductive adhesives

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Rare Metals 2012年第1期31卷 64-70页

作者： Zhu, Xiaoyun Liu, Yuanlong long, jinming Liu, Xiaoli School of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 China Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology Kunming 650093 China

The electrochemical migration (ECM) behavior of the electrically conductive adhesives (ECAs) filled with pure Ag powder or Ag-plated Cu composite powder with varied Ag:Cu ratios was investigated under the condition of applying constant voltage and distilled water *** resistance was determined from the current-time *** microstructure and composition of ECM dendrite products were analyzed by SEM/EDS and *** was found that the ECM resistance of Ag-plated Cu composite powder-filled ECAs was evidently higher than that of pure Ag powder-filled *** Ag:Cu ratio of composite powder in ECAs had notable influence on ECM resistance,which was enhanced with the decrease of Ag:Cu *** composition of dendrites formed between cathode and anode during ECM process was not uniform for Ag-plated Cu-filled *** ECM inhibiting mechanism of Ag-plated Cu composite powder was proposed according to analysis of the electrochemical impedance spectroscopy,Tafel plot and dendrite composition.

关键词： composite material electrochemical migration Ag-plated Cu composite powder electrically conductive adhesives

Stellar Populations of AGN-host Dwarf Galaxies Selected with Different Methods

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Research in Astronomy and Astrophysics 2024年第6期24卷 52-67页

作者： Xiejin Li 赵应和 jinming Bai Yunnan Observatories Chinese Academy of SciencesKunming 650216China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Radio Astronomy and Technology Chinese Academy of SciencesBeijing 100101China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650011China

In this paper we investigate the stellar populations and star formation histories of 235 active galactic nucleus(AGN)-host dwarf galaxies,consisting of four samples identified separately with different methods(i.e.,radio,X-ray,mid-IR and variability),utilizing the synthesis code STARLIGHT and spectra from the Sloan Digital Sky Survey Data Release *** results show that the variability sample is the oldest,while the mid-IR sample is the youngest,for which the luminosity at 4020?is dominated(>50%)by the young population(t<10~8yr).The light-weighted mean stellar age of the whole sample is in general about 0.7 dex younger than the optical sample studied in Cai et *** compare the population results between fitting models with and without a power-law(PL)component and find that the neglect of a PL component would lead to an under-and over-estimation by 0.2 and0.1 dex for the light-and mass-weighted mean stellar age,respectively,for our sample of dwarf galaxies,which has a mean fractional contribution of~16%from the *** addition,we obtain further evidence for a possible suppression of star formation in the host galaxy by the central *** also find that there exists an anticorrelation between the extinction-corrected[O III]luminosity and light-weighted mean stellar age,confirming our previous finding that there is a physical connection between AGN and star-forming activities in AGN-host dwarfs.

关键词： galaxies:dwarf galaxies:active galaxies:stellar content

Synthesis and applications of carbon nanospheres:A review

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Particuology 2024年第4期87卷 325-338页

作者： Yaqi Yao jinming Xu Yanqiang Huang Tao Zhang State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

The synthesis of carbon nanospheres(CNS)has developed rapidly in recent years,and they are widely used owing to the tunability of their porous structures and surface properties and the unique hydrodynamic advantages conferred by their spherical *** review summarizes the methods used to synthesize CNS and their applications in various *** review first describes the four main methods of CNS synthesis,*** template,spray-drying,hydrothermal carbonization,Stöber and chemical vapor depo-sition ***,applications in the fields of energy storage,adsorption,biological medicine,and catalysis are ***,some insights on the development and design of CNS are presented.

关键词： Carbon nanosphere Synthesis Application

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掺杂导电增强相对铝电极性能的影响

材料导报 2021年第8期35卷 82-87页

作者：汪冲朱晓云龙晋明昆明理工大学材料科学与工程学院昆明650093 昆明贵信凯科技有限公司昆明650039

掺杂不同含量的石墨烯、碳纳米管、纳米银、银包铝粉作为导电增强相制备铝浆,将其印刷在氧化锌基片上并在680℃烧结得到铝电极,研究不同导电增强相对铝电极的导电性和附着力等性能的影响。采用四探针法测定铝电极方阻,通过二次烧结银电... 详细信息

掺杂不同含量的石墨烯、碳纳米管、纳米银、银包铝粉作为导电增强相制备铝浆,将其印刷在氧化锌基片上并在680℃烧结得到铝电极,研究不同导电增强相对铝电极的导电性和附着力等性能的影响。采用四探针法测定铝电极方阻,通过二次烧结银电极,使用拉力试验机测定铝电极的附着力。采用扫描电镜(SEM)、X射线衍射仪(XRD)等手段对掺杂导电增强相铝电极的显微组织、形貌及成分等进行表征。结果表明:碳纳米管和石墨烯的掺杂量分别为1%、2%(质量分数,下同)时,铝电极导电性的提高效果较好,当掺杂量分别高于1.5%、3%时,铝电极表面形貌及组织会被破坏,导致铝电极导电能力差、附着力低;掺杂纳米银对铝电极导电性的提高效果最好,掺杂后铝电极表面平滑光整、组织致密均匀、金属光泽度高、附着力好。掺杂6%纳米银制备S3组铝电极,测定其平均方阻为0.22Ω/,该铝电极与氧化锌基体的附着力达到8.9 N/mm^(2)。同时,为了探究铝电极的稳定性,实验测定了掺杂不同导电增强相的铝电极在室温60 d内的电阻变化率。结果表明:各组铝电极电阻在室温环境下变化均较小,掺杂纳米银的铝电极电阻变化率最小,为0.98%;掺杂碳纳米管的铝电极电阻变化率最大,为1.52%。

关键词：掺杂铝电极导电增强相

Spatially Coupled Codes via Bidirectional Block Markov Superposition Transmission

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Tsinghua Science and Technology 2024年第3期29卷 656-670页

作者： Gaoyan Li Shancheng Zhao Haiqiang Chen jinming Wen College of Information Science and Technology Jinan UniversityGuangzhou 510632China Guangxi Key Laboratory of Multimedia Communications and Network Technology Guangxi UniversityNanning 530004China

In this paper,we present a new class of spatially coupled codes obtained by using both non-recursive and recursive block-oriented *** resulting codes are termed as bidirectional block Markov superposition transmission(BiBMST)***,we perform an iterative decoding threshold analysis according to protograph-based extrinsic information transfer(PEXIT)charts for the BiBMST codes over the binary erasure channels(BECs).Secondly,we derive the generator and parity-check matrices of the BiBMST ***,extensive numerical results are presented to show the advantages of the proposed BiBMST ***,our numerical results show that,under the constraint of an equal decoding latency,the BiBMST codes perform better than the recursive BMST(rBMST)***,the simulation results show that,in finite-length regime,negligible performance gain is obtained by increasing the encoding *** solve this limitation by introducing partial superposition,and the resulting codes are termed as partially-connected BiBMST(PC-BiBMST)*** results have confirmed the advantages of the PC-BiBMST codes over the original BiBMST *** also present extensive simulation results to show the performance advantages of the PC-BiBMST codes over the spatially coupled low-density parity-check(SC-LDPC)codes,spatially coupled generalized LDPC(SC-GLDPC)codes,and the original BiBMST codes in the finite-length regime.

关键词： block Markov superposition transmission(BMST) protograph-based extrinsic information transfer(PEXIT) capacity-approaching codes spatial coupling

Emerging roles and therapeutic potentials of sphingolipids in pathophysiology:emphasis on fatty acyl heterogeneity

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Journal of Genetics and Genomics 2024年第3期51卷 268-278页

作者： jinming Mu Sin Man Lam Guanghou Shui State Key Laboratory of Molecular Developmental Biology Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100101China Lipidall Technologies Company Limited ChangzhouJiangsu 213000China

Sphingolipids not only exert structural roles in cellular membranes,but also act as signaling molecules in various physiological and pathological processes.A myriad of studies have shown that abnormal levels of sphingolipids and their metabolic enzymes are associated with a variety of human ***,blood sphingolipids can also be used as biomarkers for disease *** review summarizes the biosynthesis,metabolism,and pathological roles of sphingolipids,with emphasis on the biosynthesis of ceramide,the precursor for the biosynthesis of complex sphingolipids with different fatty acyl *** possibility of using sphingolipids for disease prediction,diagnosis,and treatment is also *** endogenous ceramides and complex sphingolipids along with their specific fatty acyl chain to promote future drug development will also be discussed.

关键词： Sphingolipids Ceramide Therapeutic targets Microdomain Biomarker

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云南斑铜的生产工艺研究

特种铸造及有色合金 2007年第7期27卷 567-569页

作者：王少龙蒋业华龙晋明昆明理工大学机电工程学院昆明理工大学材料与冶金工程学院

详细论述了斑铜生产工艺中的几个关键步骤,重点研究了熔炼过程中合金成分、模具的材质以及斑铜显斑着色液对斑铜斑纹的影响,初步找到了影响斑纹的规律。结果表明,当斑铜中Zn的质量分数达到6%时得到的斑纹大小比较理想;采用砂模浇注可以... 详细信息

详细论述了斑铜生产工艺中的几个关键步骤,重点研究了熔炼过程中合金成分、模具的材质以及斑铜显斑着色液对斑铜斑纹的影响,初步找到了影响斑纹的规律。结果表明,当斑铜中Zn的质量分数达到6%时得到的斑纹大小比较理想;采用砂模浇注可以得到不规则斑纹,而采用铁模浇铸可以得到颗粒状斑纹;显斑着色液对斑铜斑纹几乎没有影响。

关键词：艺术铸造斑铜斑纹显斑着色

Zero-Dynamics Attacks for Multi-Agent Systems Without Velocity Measurements

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Journal of Systems Science & Complexity 2024年第5期37卷 1809-1831页

作者： GAO jinming WANG Yijing ZUO Zhiqiang ZHANG Wentao Tianjin Key Laboratory of Intelligent Unmanned Swarm Technology and System School of Electrical and Information Engineering Tianjin University Continental-NTU Corporate Lab School of Electrical and Electronic Engineering Nanyang Technological University

This paper studies the periodic zero-dynamics attacks(ZDAs) in multi-agent systems without velocity measurements under directed graph. Specifically, two types of attack modes are addressed,i.e., infinite number and finite number of zero-dynamics attacks. For the former case, the authors show that the consensus of the considered system cannot be guaranteed. For the latter case, the dynamic evolution of the agents is investigated and it is found that only attacking the rooted agents can destroy the consensus. Then, a sufficient condition which quantifies whether or not the consensus value is destroyed is given, revealing the relationship among parameters of system model, filter and attack ***, simulations are carried out to verify the effectiveness of the theoretical findings.

关键词： Consensus directed graph multi-agent systems zero-dynamics attacks

Prospects of the Multi-channel Photometric Survey Telescope in the Cosmological Application of Type Ia Supernovae

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Research in Astronomy and Astrophysics 2024年第4期24卷 183-191页

作者： Zhenyu Wang Jujia Zhang Xinzhong Er jinming Bai Yunnan Observatories Chinese Academy of SciencesKunming 650216China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China International Centre of Supernovae Yunnan Key LaboratoryKunming 650216China South-Western Institute for Astronomy Research Yunnan UniversityKunming 650500China

The Multi-channel Photometric Survey Telescope(Mephisto)is a real-time,three-color photometric system designed to capture the color evolution of stars and transients *** telescope system can be crucial in cosmological distance measurements of low-redshift(low-z,z■0.1)Type Ia supernovae(SNe Ia).To optimize the capabilities of this instrument,we perform a comprehensive simulation study before its official operation is scheduled to *** considering the impact of atmospheric extinction,weather conditions,and the lunar phase at the observing site involving the instrumental features,we simulate light curves of SNe Ia obtained by *** best strategy in the case of SN Ia cosmology is to take the image at an exposure time of 130 s with a cadence of 3 *** this condition,Mephisto can obtain hundreds of high-quality SNe Ia to achieve a distance measurement better than 4.5%.Given the on-time spectral classification and monitoring of the Lijiang 2.4 m Telescope at the same observatory,Mephisto,in the whole operation,can significantly enrich the well-calibrated sample of supernovae at low-z and improve the calibration accuracy of high-z SNe Ia.

关键词： (stars:)supernovae:general (cosmology:)cosmological parameters telescopes