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Microstructure and Shear Properties Evolution of Minor Fe-doped SAC/Cu Substrate Solder Joint under Isothermal Aging

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1279-1290页

作者： Quanzhen Li Chengming Li Xiaojing Wang Shanshan Cai Jubo Peng Shujin Chen Jiajun Wang Xiaohong Yuan Jiangsu University of Science and Technology Zhenjiang212003China r&d center Yunnan Tin Group(Holding)Co.LtdKunming650000China The 58 Research Institute of China Electronics Technology Group CorporationWuxi214100China Yunnan Precious Metals Lab Sino-Platinum Metals Co.LtdKunming650156China

different amounts of Fe(0.005,0.01,0.03,0.05,and 0.07 wt%)were added to SAC305 to study the shear behavior damage of Fe-doped SAC solder joints under thermal loading(170℃,holding time of 0,250,500,and 750 h).The results show that during isothermal aging at 170℃,the average shear force of all solder joints decreases with increasing aging time,while the average fracture energy first increases and then decreases,reaching a maximum at 500 *** Fe doping could both increase shear forces and related fracture energy,with the optimum Fe doping amount being 0.03 wt%within the entire aging *** is because the doping Fe reduces the undercooling of the SAC305 alloy,resulting in the microstructure refining of solder *** in turn causes the microstructure changing from network structure(SAC305 joint:eutectic network+β-Sn)to a single matrix structure(0.03Fe-doped SAC305 joint:β-Sn matrix+small compound particles).Specifically,Fe atoms can replace some Cu in Cu_(6)Sn_(5)(both inside the solder joint and at the interface),and then form(Cu,Fe)_(6)Sn_(5) compounds,resulting in an increase in the elastic modulus and nanohardness of the ***,the growth of Cu_(6)Sn_(5) and Cu_(3)Sn intermetallic compounds(IMC)layer are inhibited by Fe doping even after the aging time prolonging,and Fe aggregates near the interface compound to form FeSn_(2).This study is of great significance for controlling the growth of interfacial compounds,stabilizing the microstructures,and providing strengthening strategy for solder joint alloy design.

关键词： SAC305 solder Fe doping Shear mechanical behavior Isothermal aging Interfacial intermetallic compounds(IMC)

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Coke behavior with H_(2)O in a hydrogen-enriched blast furnace:A review

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 959-976页

作者： Feng Zhou daosheng Peng Kejiang Li Alberto N.Conejo Haotian Liao Zixin Xiong dongtao Li Jianliang Zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Chemical Engineering The University of QueenslandSt LuciaQLD 4072Australia Baosteel Central research Institute(r&d center of Wuhan Iron&Steel Co. Ltd.)Wuhan 430080China Shougang research Institute of Technology Shougang Group Corporation Ltd.Beijing 100043China Beijing Key Laboratory of Green recyclable Process for Iron and Steel Production Technology Beijing 100043China

Hydrogen-enriched blast furnace ironmaking has become an essential route to reduce CO_(2)emissions in the ironmaking ***,hydrogen-enriched reduction produces large amounts of H_(2)O,which places new demands on coke quality in a blast *** a hydrogen-rich blast furnace,the presence of H_(2)O promotes the solution loss *** result improves the reactivity of coke,which is 20%-30%higher in a pure H_(2)O atmosphere than in a pure CO_(2)*** activation energy range is 110-300 kJ/mol between coke and CO_(2)and 80-170 kJ/mol between coke and H_(2)***_(2)and H_(2)O are shown to have different effects on coke degradation *** review provides a comprehensive overview of the effect of H_(2)O on the structure and properties of *** exploring the interactions between H_(2)O and coke,several unresolved issues in the field requiring further research were *** review aims to provide valuable insights into coke behavior in hydrogen-rich environments and promote the further development of hydrogen-rich blast furnace ironmaking processes.

关键词： hydrogen ironmaking coke behavior blast furnace gasification microstructure kinetics

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Effect of Ni content on the weldability of middle-chromium hyperpure ferritic stainless steels 00Cr21Ti

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Baosteel Technical research 2024年第2期18卷 19-26页

作者： ZHANG Xinbao WANG Zhibin SUN Mingshan YAN Zhifeng WANG Wenxian r&d center for Stainless Steel Research InstituteChina Baowu Steel Group CorporationTaiyuan 030003China School of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Excellent weldability substantially contributes to the intrinsic quality of steels,while appropriate chemical composition plays a primary role in the essential weldability of *** poor weldability of ferritic stainless steels could be improved through modification with minor alloy elements while minimally increasing the ***,studying the effect of minor alloy elements on the weldability of steels is of considerable *** this study,several steels of middle-chromium hyperpure ferritic stainless 00Cr21Ti with different Ni content(0.3%,0.5%,0.8%,and 1.0%)were developed,and their weldabilities of butt joint samples welded using the metal inert gas welding process,including the influence of welded joints on the microstructure,tensile performance,corrosion resistance,and fatigue property,were *** show that the steels with w(Ni)≥0.8%exhibit excellent mechanical properties compared with those with low-Ni content steels,further,their impact toughness at normal atmospheric temperature meets the industrial application standard and the fatigue property is similar to that of 304 austenitic stainless ***,results show that the corrosion resistance of all the samples is almost at the same *** results acquired in this study are supposed to be useful for the optimization of the chemical composition of stainless steels aiming to improve weldability.

关键词： 00Cr21Ti ferritic stainless steel SUS443 welded joint mechanical properties fatigue property Ni content

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Steady-state Voltage Security-constrained Optimal Frequency Control for Weak HVdC Sending-end AC Power Systems

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 658-669页

作者： Qiangqiang Wang Liangzhong Yao Jian Xu Yuping Zheng Wei Li Wei Wang School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China Hubei Engineering and Technology research center for AC/dC Intelligent distribution Network(Wuhan University) Wuhan 430072China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation(State Grid Electric Power Research Institute)Nanjing 211106China

due to the fact that a high share of renewable energy sources(rESs)are connected to high-voltage direct current(HVdC)sending-end AC power systems,the voltage and frequency regulation capabilities of HVdC sending-end AC power systems have *** has resulted in potential system operating problems such as overvoltage and overfrequency,which occur simultaneously when block faults exist in the HVdC *** this study,a steady-state voltage security-constrained optimal frequency control method for weak HVdC sending-end AC power systems is *** integrated virtual inertia control of rESs is employed for system frequency *** dynamic reactive power compensation devices are utilized to control the voltage of all nodes meet voltage security ***,an optimization model that simultaneously considers the frequency and steady-state voltage security constraints for weak HVdC sending-end AC power systems is *** optimal control scheme with the minimum total cost of generation tripping and additional dynamic reactive power compensation required is obtained through the optimization *** are conducted on a modified IEEE 9-bus test system and practical Qing-Yu line commutated converter based HVdC(LCC-HVdC)sending-end AC power system to verify the effectiveness of the proposed method.

关键词： renewable energy source(rES) high-voltage direct current(HVdC) AC power system optimal frequency control steady-state voltage security dynamic reactive power compensation

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data Component:An Innovative Framework for Information Value Metrics in the digital Economy

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china Communications 2024年第5期21卷 17-35页

作者： Tao Xiaoming Wang Yu Peng Jieyang Zhao Yuelin Wang Yue Wang Youzheng Hu Chengsheng Lu Zhipeng department of Electronic Engineering Tsinghua UniversityBeijing 100084China Beijing National research center for Information Science and Technology Beijing 100084China china Electronics corporation Beijing 100084China

The increasing dependence on data highlights the need for a detailed understanding of its behavior,encompassing the challenges involved in processing and evaluating ***,current research lacks a comprehensive structure for measuring the worth of data elements,hindering effective navigation of the changing digital *** paper aims to fill this research gap by introducing the innovative concept of“data components.”It proposes a graphtheoretic representation model that presents a clear mathematical definition and demonstrates the superiority of data components over traditional processing ***,the paper introduces an information measurement model that provides a way to calculate the information entropy of data components and establish their increased informational *** paper also assesses the value of information,suggesting a pricing mechanism based on its *** conclusion,this paper establishes a robust framework for understanding and quantifying the value of implicit information in data,laying the groundwork for future research and practical applications.

关键词： data component data element data governance data science information theory

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An improved GNSS ambiguity best integer equivariant estimation method with Laplacian distribution for urban low-cost rTK positioning

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Satellite Navigation 2024年第1期5卷 109-124页

作者： Ying Liu Wanke Liu Xiaohong Zhang Yantao Liang Xianlu Tao Liye Ma School of Geodesy and Geomatics Hubei Luojia LaboratoryWuhan University129 Luoyu RoadWuhan430079HubeiChina Chinese Antarctic center of Surveying and Mapping Wuhan University129 Luoyu RoadWuhan430079HubeiChina School of Instrument Science and Engineering Southeast UniversityNanjingJiangsuChina The 54 Research Institute of China Electronics Technology Group CorporationShijiazhuang050081HebeiChina State Key Laboratory of Satellite Navigation System and Equipment Technology Shijiazhuang050081HebeiChina

The integer least squares(ILS)estimation is commonly used for carrier phase ambiguity resolution(Ar).More recently,the best integer equivariant(BIE)estimation has also attracted an attention for complex application scenarios,which exhibits higher reliability by a weighted fusion of integer ***,traditional BIE estimation with Gaussian distribution(GBIE)faces challenges in fully utilizing the advantages of BIE for urban low-cost positioning,mainly due to the presence of outliers and unmodeled *** this end,an improved BIE estimation method with Laplacian distribution(LBIE)is proposed,and several key issues are discussed,including the weight function of LBIE,determination of the candidates included based on the OIA test,and derivation of the variance of LBIE solutions for reliability *** results show that the proposed LBIE method has the positioning accuracy similar to the BIE using multivariate t-distribution(TBIE),and significantly outperforms the ILS-PAr and GBIE *** an urban expressway test with a Huawei Mate40 smartphone,the LBIE method has positioning errors of less than 0.5 m in three directions and obtains over 50%improvements compared to the ILS-PAr and GBIE *** an urban canyon test with a low-cost receiver STA8100 produced by STMicroelectronics,the positioning accuracy of LBIE in three directions is 0.112 m,0.107 m,and 0.252 m,respectively,with improvements of 17.6%,27.2%,and 26.1%compared to GBIE,and 23.3%,28.2%,and 30.6%compared to ***,its computational time increases by 30–40%compared to ILS-PAr and is approximately half of that using TBIE.

关键词： Ambiguity resolution Best integer equivariant estimation Laplacian distribution Urban environments Low-cost GNSS receivers real-time kinematic

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A Novel Anti-Collision Algorithm for Large Scale of UHF rFId Tags Access Systems

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Computers, Materials & Continua 2024年第7期80卷 897-912页

作者： Xu Zhang Yi He Haiwen Yi Yulu Zhang Yuan Li Shuai Ma Gui Li Zhiyuan Zhao Yue Liu Junyang Liu Guangjun Wen Jian Li School of Information and Communication Engineering/Yibin Institute University of Electronic Science and Technology of ChinaChengdu611731China department of IoT Technology research China Mobile Research InstituteBeijing100053China The 10th research Institute of china Electronics Technology group corporation Chengdu611731China College of Information and Communication National University of Defense TechnologyWuhan430019China

When the radio frequency identification(rFId)system inventories multiple tags,the recognition rate will be seriously affected due to *** on the existing dynamic frame slotted Aloha(dFSA)algorithm,a sub-frame observation and cyclic redundancy check(CrC)grouping combined dynamic framed slotted Aloha(SUBF-CGdFSA)algorithm is *** algorithm combines the precise estimation method of the quantity of large-scale tags,the large-scale tags grouping mechanism based on CrC pseudo-randomcharacteristics,and the Aloha anti-collision optimization mechanism based on sub-frame *** grouping tags and sequentially identifying themwithin subframes,it accurately estimates the number of remaining tags and optimizes frame length accordingly to improve efficiency in large-scale rFId *** outcomes demonstrate that this proposed algorithmcan effectively break through the system throughput bottleneck of 36.8%,which is up to 30%higher than the existing dFSA standard scheme,and has more significant advantages,which is suitable for application in largescale rFId tags scenarios.

关键词： radio frequency identification anti-collision tags grouping dynamic framed slotted Aloha

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Passive IoT Localization Technology Based on Sd-PdOA in NLOS and Multi-Path Environments

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Computers, Materials & Continua 2024年第7期80卷 913-930页

作者： Junyang Liu Yuan Li Yulu Zhang Shuai Ma Gui Li Yi He Haiwen Yi Yue Liu Xiaotao Xu Xu Zhang Jinyao He Guangjun Wen Jian Li School of Information and Communication Engineering/Yibin Institute University of Electronic Science and Technology of ChinaChengdu611731China department of IoT Technology research China Mobile Research InstituteBeijing100053China The 10th research Institute of china Electronics Technology group corporation Chengdu611731China College of Information and Communication National University of Defense TechnologyWuhan430019China

Addressing the challenges of passive radio Frequency Identification(rFId)indoor localization technology in Non-Line-of-Sight(NLoS)and multipath environments,this paper presents an innovative approach by introducing a combined technology integrating an improved Kalman Filter with Space domain Phase difference of Arrival(Sd-PdOA)and received Signal Strength Indicator(rSSI).This methodology utilizes the distinct channel characteristics in multipath and NLoS contexts to effectively filter out interference and accurately extract localization information,thereby facilitating high precision and stability in passive rFId *** efficacy of this approach is demonstrated through detailed simulations and empirical tests conducted on a custom-built experimental platform consisting of passive rFId tags and an r420 *** findings are significant:in NLoS conditions,the four-antenna localization system achieved a notable localization accuracy of 0.25 m at a distance of 5 *** complex multipath environments,this system achieved a localization accuracy of approximately 0.5 m at a distance of 5 *** compared to conventional passive localization methods,our proposed solution exhibits a substantial improvement in indoor localization accuracy under NLoS and multipath *** research provides a robust and effective technical solution for high-precision passive indoor localization in the Internet of Things(IoT)system,marking a significant advancement in the field.

关键词： Indoor localization multipath and NLoS environments combined Sd-PdOA and rSSI technology

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Milling degree affects the fermentation properties of rice:perspectives from the composition of nutrients and gut microbiota via in vitro fermentation

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Food Science and Human Wellness 2024年第3期13卷 1578-1588页

作者： Yu Zhang Fan Li Shutong Pan Bing Bai Kai Huang Sen Li Hongwei Cao Tian Xie Jian Xie Xiao Guan School of Health Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China National Grain Industry(Urban Grain and Oil Security)Technology Innovation center Shanghai 200093China Nutrition&Health research Institute Co.Ltd. COFCO CorporationBeijing 102209China china Grain Wuhan Scientific research&design Institute Co.Ltd. Wuhan 430079China

Fermentation substrates of rice with different milling degrees(Mds) were prepared and fermented with human feces to compare their fermentation properties and effects on gut *** 0s,Md 5s and Md 60s represented brown rice,moderately-milled rice and white rice,*** in vitro fermentation,the Md 5s group showed higher starch utilization,compared with the Md 0s and 60s groups evaluated by Fourier transform infrared spectrometer,and confocal laser scanning *** of fermentation substrates of rice with different Mds on gut microbiota were evaluated by 16S rdNA *** the sample groups reduced the pH and produced short-chain fatty acids(SCFAs) and branched-chain fatty *** Md 5s group exhibited higher α-diversity than the Md 0s and 60s *** of Phascolarctobacterium,Blautia and norank_f_ruminococcaceae were higher in the Md 0s and 5s groups,compared with the Md 60s *** bacteria were also positively correlated with the SCFAs production via Spearman correlation *** vitro culture assay revealed that fermentation substrates of Md 0s and 5s promoted the growth of two probiotics(Akkermansia muciniphila and Bifidobacterium adolescentis).Our results showed that moderate milling might be an appropriate way to produce rice products with richer nutrients and better fermentation properties.

关键词： rice processing Milling Whole grains Gut microbiota

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Enhanced optical imaging and fluorescent labeling for visualizing drug molecules within living organisms

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Acta Pharmaceutica Sinica B 2024年第6期14卷 2428-2446页

作者： Ting Sun Huanxin Zhao Luyao Hu Xintian Shao Zhiyuan Lu Yuli Wang Peixue Ling Yubo Li Kewu Zeng Qixin Chen School of Pharmaceutical Sciences National Key Laboratory of Advanced Drug Delivery SystemMedical Science and Technology Innovation CenterShandong First Medical University&Shandong Academy of Medical SciencesJinan 250062China departments of diagnostic radiology SurgeryChemical and Biomolecular Engineeringand Biomedical EngineeringYong Loo Lin School of Medicine and College of Design and EngineeringNational University of SingaporeSingapore 119074Singapore Institute of Biochemical and Biotechnological drugs School of Pharmaceutical SciencesCheeloo College of MedicineShandong UniversityJinan 250012China Key Laboratory of Biopharmaceuticals Postdoctoral Scientific Research WorkstationShandong Academy of Pharmaceutical ScienceJinan 250098China State Key Laboratory of Natural and Biomimetic drugs School of Pharmaceutical SciencesPeking UniversityBeijing 100191China School of Life Sciences Science and Technology Innovation CenterShandong First Medical University&Shandong Academy of Medical SciencesJinan 250062China School of Chinese Materia Medica Tianjin University of Traditional Chinese MedicineTianjin 301617China Tianjin Pharmaceutical dA rEN TANG group corporation Limited Traditional Chinese Pharmacy research Institute Tianjin 300457China Key Laboratory of Systems Bioengineering(Ministry of Education) School of Chemistry Engineering and TechnologyTianjin UniversityTianjin 300072China

The visualization of drugs in living systems has become key techniques in modern *** advancements in optical imaging technologies and molecular design strategies have revolutionized drug *** the subcellular level,super-resolution microscopy has allowed exploration of the molecular landscape within individual cells and the cellular response to *** beyond subcellular imaging,researchers have integrated multiple modes,like optical near-infrared II imaging,to study the complex spatiotemporal interactions between drugs and their *** combining these visualization approaches,researchers gain supplementary information on physiological parameters,metabolic activity,and tissue composition,leading to a comprehensive understanding of drug *** review focuses on cutting-edge technologies in drug visualization,particularly fluorescence imaging,and the main types of fluorescent molecules ***,we discuss current challenges and prospects in targeted drug research,emphasizing the importance of multidisciplinary cooperation in advancing drug *** the integration of advanced imaging technology and molecular design,drug visualization has the potential to redefine our understanding of pharmacology,enabling the analysis of drug micro-dynamics in subcellular environments from new perspectives and deepening pharmacological research to the levels of the cell and organelles.

关键词： Optical imaging drug visualization Fluorophore labeling Therapeutics

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