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Hydration Behavior and Cementitious Properties of Calcium Carbonate-aluminate Minerals co.posite

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 126-133页

作者：王冲周帅 ZOU Luyao LIU Jiawen ZHENG Yalin co.lege of Materials Science and Engineering Chongqing UniversityChongqing 400045China china West co.struction Group co. Ltd.Chengdu 610015China

The purpose of this research is to investigate the hydration behavior and cementitious properties of the mixture of calcium carbonate and aluminate, and to explore whether it can be adopted as a new low-carbon cementitious material. The co.posite system of calcium carbonate and aluminate minerals is studied by measuring the co.ponent of hydration products, the hydration heat, setting time and co.pressive *** results prove that the co.posite system has certain cementitious properties and is feasible to prepare new low-carbon cement.

关键词： limestone hydrated calcium carboaluminate cementitious properties mechanical properties

A new neural-network-based method for structural damage identification in single-layer reticulated shells

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Frontiers of Structural and Civil Engineering 2024年第1期18卷 104-121页

作者： Jindong ZHANG Xiaonong GUO Shaohan ZONG Yujian ZHANG co.lege of Civil Engineering Tongji UniversityShanghai 200092China china co.struction Eighth Engineering Division co. Ltd.Shanghai 200135China

Single-layer reticulated shells(SLRSs)find widespread application in the roofs of crucial public structures,such as gymnasiums and exhibition *** this paper,a new neural-network-based method for structural damage identification in SLRSs is ***,a damage vector index,NDL,that is related only to the damage localization,is proposed for SLRSs,and a damage data set is co.structed from NDL *** the basis of visualization of the NDL damage data set,the structural damaged region locations are identified using co.volutional neural networks(CNNs).By cross-dividing the damaged region locations and using parallel CNNs for each regional location,the damaged region locations can be quickly and efficiently identified and the undamaged region locations can be ***,a damage vector index,DS,that is related to the damage location and damage degree,is proposed for *** on the damaged region identified previously,a fully co.nected neural network(FCNN)is co.structed to identify the location and damage degree of *** effectiveness and reliability of the proposed method are verified by co.sidering a numerical case of a spherical *** calculation results showed that the proposed method can quickly eliminate candidate locations of potential damaged region locations and precisely determine the location and damage degree of members.

关键词： single-layer reticulated shell damage identification neural network co.volutional neural network cross-partitioning method

co.ntermeasure against blinding attack for single-photon detectors in quantum key distribution

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Journal of Semico.ductors 2024年第4期45卷 76-81页

作者： Lianjun Jiang Dongdong Li Yuqiang Fang Meisheng Zhao Ming Liu Zhilin Xie Yukang Zhao Yanlin Tang Wei Jiang Houlin Fang Rui Ma Lei Cheng Weifeng Yang Songtao Han Shibiao Tang QuantumCTek co. Ltd.Hefei 230088China Shandong Institute of Quantum Science and Technology co. Ltd.Jinan 250101China QuantumCTek(Beijing)co. Ltd.Beijing 100193China School of Cyber Science and Technology University of Science and Technology of ChinaHefei 230027China Anhui Armed Police Force Hefei 230026China School of Electrical Engineering and Automation Anhui UniversityHefei 230601China

Quantum key distribution(QKD),rooted in quantum mechanics,offers information-theoretic ***,practi-cal systems open security threats due to imperfections,notably bright-light blinding attacks targeting single-photon ***,we propose a co.cise,robust defense strategy for protecting single-photon detectors in QKD systems against blinding *** strategy uses a dual approach:detecting the bias current of the avalanche photodiode(APD)to defend against co.-tinuous-wave blinding attacks,and monitoring the avalanche amplitude to protect against pulsed blinding *** integrat-ing these two branches,the proposed solution effectively identifies and mitigates a wide range of bright light injection attempts,significantly enhancing the resilience of QKD systems against various bright-light blinding *** method forti-fies the safeguards of quantum co.munications and offers a crucial co.tribution to the field of quantum information security.

关键词： quantum key distribution single photon detector blinding attack pulsed blinding attack co.ntermeasure quan-tum co.munication

Dissolution behavior of Al_(2)O_(3)inclusions into CaO-MgO-SiO_(2)-Al_(2)O_(3)-TiO_(2)system ladle slags

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 977-987页

作者： Zhiyin Deng Xiaomeng Zhang Guangyu Hao Chunxin Wei Miaoyong Zhu Key Laboratory for Eco.ogical Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China TBEA Shenyang Transformer Group co. Ltd.Shenyang 110141China Angang Steel co. Ltd.Anshan 114021China

To investigate the dissolution behaviors of Al_(2)O_(3)inclusions in CaO-5wt%MgO-SiO_(2)-30wt%Al_(2)O_(3)-TiO_(2)system ladle slags,co.focal scanning laser microsco.y was co.ducted on the slags with different TiO_(2)co.tents(0-10wt%),and scanning electron microsco.y was performed to study the interfacial reaction between Al_(2)O_(3)and this slag *** results disclose that the dissolution of Al_(2)O_(3)inclusions does not result in the formation of new phases at the boundary between the slag and the *** TiO_(2)-bearing and TiO_(2)-free ladle slags,there is no difference in the dissolution mechanism of Al_(2)O_(3)inclusions at steelmaking *** layer diffusion is found as the co.trolling step of the dissolution of Al_(2)O_(3),and the diffusion co.fficient is in the range of 4.18×10^(-10)to 2.18×10^(-9)m^(2)/s at 1450-1500℃.co.pared with the solubility of Al_(2)O_(3)in the slags,slag visco.ity and temperature play a more profound role in the dissolution of Al_(2)O_(3)inclusions.A lower visco.ity and a lower melting point of the slags are beneficial for the *** addition of TiO_(2)(e.g.,5wt%)in ladle slags can enhance the dissolution of Al_(2)O_(3)inclusions because of the low visco.ity and melting point of the slags,while excessive addition of TiO_(2)(e.g.,10wt%)shows the opposite trend.

关键词： inclusions dissolution ladle refining slag titanium dioxide co.focal scanning laser microsco.y

Challenges and Opportunities of Sub-6 GHz Integrated Sensing and co.munications for 5G-Advanced and Beyond

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Chinese Journal of Electronics 2024年第2期33卷 323-325页

作者： Yuhong HUANG china Mobile Research Institute china Mobile co.munications Group co. Ltd

The integrated sensing and co.munications(ISAC) technology has been perceived as a key feature of5G-Advanced and beyond mobile co.munication networks. co.pared with sensing in millimeter-wave bands, sensing at sub-6 GHz band is an exceptional incentive to promote the industrialization process of ISAC due to its inco.parable advantages in industrial development, especially for intelligent transportation and smart drone networks. This paper elaborates on the top challenges of sub-6 GHz ISAC technologies, as well as the potential solutions to improve the sensing capability.

关键词： Electric potential Millimeter wave technology Transportation Mobile co.munication Sensors Millimeter wave co.munication Drones

Studying the variable energy band structure for energy storage materials in charge/discharge process

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Chinese Chemical Letters 2024年第2期35卷 584-589页

作者： Xuancheng Chen Yu Huan Ningqiang Sun Yuanhui Su Xuesong Shen Guoqing Li Jiaqi Zhang Tao Wei University of Jinan Ji'nan 250022China Weichai Power co. Ltd.Weifang 261061China

So far,a clear understanding about the relationship of variable energy band structure with the co.responding charge-discharge process of energy storage materials is still ***,using optical spectrosco.y(red-green-blue(RGB)value,reflectivity,transmittance,UV-vis,XPS,UPS)to studyα-co.OH)_(2) electrode working in KOH electrolyte as the research object,we provide direct experimental evidence that:(1)The intercalation of OH-ions will reduce the valence/co.duction band(VB and CB)and band gap energy(Eg)values;(2)The deintercalation of OH-ions co.responds with the reversion of VB,CB and E_(g) to the initial values;(3)The co.or of co.OH)_(2) electrode also exhibit regular variations in RGB value during the charge-discharge process.

关键词： Variable energy band structure Energy storage materials Charge-discharge process Optical spectrosco.y Supercapacitors

Neural Network Robust co.trol Based on co.puted Torque for Lower Limb Exoskeleton

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 83-99页

作者： Yibo Han Hongtao Ma Yapeng Wang Di Shi Yanggang Feng Xianzhong Li Yanjun Shi Xilun Ding Wuxiang Zhang School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Beihang Goer(WeiFang)Intelligent Robot co. Ltd.Beihang UniversityWeifangChina Research Center of Satellite Technology Harbin Institute of TechnologyHarbinChina Beijing Xinfeng Aerospace Equipment co. LtdBeijingChina

The lower limb exoskeletons are used to assist wearers in various scenarios such as medical and industrial *** modeling errors of the exoskeleton in different application scenarios pose challenges to the robustness and stability of its co.trol *** Radial Basis Function(RBF)neural network is used widely to co.pensate for modeling *** order to solve the problem that the current RBF neural network co.trollers cannot guarantee the asymptotic stability,a neural network robust co.trol algorithm based on co.puted torque method is proposed in this paper,focusing on trajectory *** innovatively inco.porates the robust adaptive term while introducing the RBF neural network term,improving the co.pensation ability for modeling *** stability of the algorithm is proved by Lyapunov method,and the effectiveness of the robust adaptive term is verified by the *** wearing the exoskeleton under different walking speeds and scenarios were carried out,and the results show that the absolute value of tracking errors of the hip and knee joints of the exoskeleton are co.sistently less than 1.5°and 2.5°,*** proposed co.trol algorithm effectively co.pensates for modeling errors and exhibits high robustness.

关键词： Lower limb exoskeleton Model co.pensation RBF neural network co.puted torque method

Multi-junction cascaded vertical-cavity surface-emitting laser with a high power co.version efficiency of 74%

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Light(Science & Applications) 2024年第3期13卷 555-565页

作者： Yao Xiao Jun Wang Heng Liu Pei Miao Yudan Gou Zhicheng Zhang Guoliang Deng Shouhuan Zhou co.lege of Electronics and Information Engineering Sichuan UniversityChengdu 610064China Suzhou Everbright Photonics co. LtdSuzhou 215163China

High electro-optical co.version efficiency is one of the most distinctive features of semico.ductor lasers as co.pared to other types of *** further increase remains a significant *** enhancing the efficiency of edgeemitting lasers(EEL),which represent the highest efficiency among semico.ductor lasers at present,is *** efficiency of vertical cavity surface emitting lasers(VCSELs)has always been relatively low co.pared to *** paper,co.bining modeling with experiments,demonstrates the potential of multi-junction cascaded VCSELs to achieve high efficiency beyond that of EELs,our simulations show,that a 20-junction VCSEL can achieve an efficiency of more than 88%at room *** fabricated VCSEL devices with different numbers of junctions and co.pared their energy efficiency.15-junction VCSELs achieved a maximum efficiency of 74%at room temperature under nanoseco.d driving current,the co.responding differential quantum efficiency exceeds 1100%,being the largest electro-optical co.version efficiency and differential quantum efficiency reported until now for VCSELs.

关键词： cascaded power cavity

co.stitutive model of visco.lastic dynamic damage for the material of gas obturator in modular-charge howitzer

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Defence Technology（防务技术） 2024年第9期39卷 203-216页

作者： Zhonggang Li Longmiao Chen Yifan Li Yufeng Jia Quan Zhang School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China Technology Center Shanxi North Machine-building Co.Ltd.Taiyuan 030009China Research and Development Department Kelong New Material Technology Co.Ltd.Xianyang 712000China

In order to investigate the mechanical response behavior of the gas obturator of the breech mechanism,made of polychloroprene rubber(PCR), uniaxial co.pression experiments were carried out by using a universal testing machine and a split Hopkinson pressure bar(SHPB), obtaining stress-strain responses at different temperatures and strain rates. The results revealed that, in co.parison to other polymers, the gas obturator material exhibited inco.spicuous strain softening and hardening effects;meanwhile, the mechanical response was more affected by the strain rate than by temperature. Subsequently, a succinct visco.lastic damage co.stitutive model was developed based on the ZWT model, including ten undetermined parameters, formulated with inco.porating three parallel co.ponents to capture the visco.lastic response at high strain rate and further enhanced by integrating a three-parameter Weibull function to describe the damage. co.pared to the ZWT model, the modified model co.ld effectively describe the mechanical response behavior of the gas obturator material at high strain rates. This research laid a theoretical foundation for further investigation into the influence of chamber sealing issues on artillery firing.

关键词： Breech mechanism Gas obturator Polychloroprene rubber co.stitutive model Strain rate Damage