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Recent advances in constructing new type of epoxy resin flame retardant system using ammonium polyphosphate

Journal of Safety Science and Resilience 2024年第2期5卷 179-193页

作者： Penglun Zheng Haihan Zhao Junwei Li Quanyi Liu Hongzhou Ai Rui Yang Weiyi Xing College of Civil Aviation Safety enginering Civil Aviation Flght University of China Guanghan 618307China Civil Aircraft Fire Science and Safety Engineering key laboratory of Sichuan Province Guanghan 618307China Department of Engineering Physics Tsinghua UniversityBejing 100084China State key laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina

In recent years,research has focused heavily on the investigation of functionalized ammonium polyphosphate(APP)flame retardants to improve the fire safety of epoxy resins(EP).The reason for this is the dual nature of APP's performance in fire protection of *** article provides a comprehensive overview of the advances in the use of functionalized APP flame retardants to improve the fire resistance of EP *** then presents the improvement of the modification of the functionalized APP flame retardants in terms of the hydrophobicity,compatibility and catalytic ability of the flame retardants,as well as the effects on the fire resistance,heat resistance,smoke reduction and mechanical properties of the EP *** the summary and comparison of the relevant studies,it is clear that the functionalized APP flame retardants can effectively improve the fire safety of EP composites and offset the adverse effects of APP in EP flame retardant *** addition,APP flame retardants can obtain various excellent functions through the use of materials with different properties,and the interaction between APP and materials can also lead to more efficient fire ***,the current problem is to find ways to streamline the process and minimise the costs associated with functionalized APP flame retardants,as well as to use them effectively in industrial *** hope that this review can provide valuable hints and insights for the practical application of functionalized APP in EP and perspectives for future research.

关键词： Flame retardancy Epoxy resin Ammonium polyphosphate Mechanical properties Hydrophobicity

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Locomotion control of a rigid-soft coupled snake robot in multiple environments

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Biomimetic Intelligence & Robotics 2024年第2期4卷 12-23页

作者： Xuanyi Zhou Yuqiu Zhang Zhiwei Qiu Zhecheng Shan Shibo Cai Guanjun Bao College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310023China State key laboratory of Chemical Engineering College of Chemicaland Bioogical EngineringZhejiang UniverstyHangzhou 310027China College of Biomedical Science and Engineering South China University of TechnologyGuangzhou 510000China

The versatile motion capability of snake robots offers themselves robust adaptability in varieties of challenging environments where traditional robots may be *** study reports a novel flexible snake robot featuring a rigid-flexible coupling structure and multiple motion *** better understand the robot's behavior,a bending model for the soft actuator is ***,a dynamic model is developed to map the relationship between the input air pressure and joint torque,which is the model base for controlling the robot *** on the wave motion generated by the joint coupling direction function in different planes,multiple motion gait planning methods of the snake-like robot are *** order to evaluate the adaptability and maneuverability of the developed snake robot,extensive experiments were conducted in complex *** results demonstrate the robot's effectiveness in navigating through intricate settings,underscoring its potential for applications in various fields.

关键词： Snake robot Rigid-flexible coupled Soft actuator Motion gait analysis

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Reliability Analysis of Reinforcement Based on GM(1,1)-Markov Semi-immersion Test

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1177-1187页

作者： FU Yong QIAO Hongxia HAKUZWEYEZU Theogene School of Civil Engineering Lanzhou University of TechnologyLanzhou 730050China Gansu Advanced Civil Engineering Materials Engineering Research Center Lanzhou 730050China State key laboratory of Geomechanics and Geotechnical enginering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China Civil Engineering Department University of Chinese Academy of SciencesBeijing 100049China

To investigate the corrosion degradation law and service life of reinforced concrete in various salt solution environments,reinforced concrete specimens were semi-immersed in 3%Na_(2)CO_(3)(N3-0-0),3%Na_(2)CO_(3)+3%NaCl(N3-Cl3-0)and 3%Na_(2)CO_(3)+3%NaCl+3%Na_(2)SO_(4)(N3-Cl3-S3)salt *** electrochemical workstation was used for regular non-destructive testing,and the polarization curve and related electrochemical parameters were used as the macroscopic durability evaluation indicators,while microscopic analysis of steel bar corrosion products was performed in combination with SEM and *** addition,the corrosion current density degradation model of GM(1,1)was established and compared with the modified GM(1,1)-Markov degradation *** results showed that the prediction error of the GM(1,1)-Markov model was smaller and more accurate than that of GM(1,1).The reinforced concrete specimens in the N3-0-0,N3-Cl3-0 and N3-Cl3-S3 solutions reached the failure state in 3.08,1.67,and 2.30 years,respectively,as predicted by the GM(1,1)-Markov *** to ESM and EDS microscopic analysis of reinforcement,carbonate had no significant effect on reinforcement corrosion,chloride ions played a dominant role in reinforcement corrosion,and sulfate ion improved concrete's resistance to chloride ion *** on GM(1,1)-Markov model,the failure and damage of reinforced concrete in saline soil areas can be quantitatively evaluated in the whole life cycle,which provides a theoretical basis for the early maintenance or reinforcing of reinforced concrete.

关键词： salt solution semi-immersion corrosion current density GM(1,1)-Markov

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A novel method for modeling the phase change of iron ore particles in the cohesive zone of a blast furnace

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Particuology 2024年第3期86卷 252-261页

作者： Dianyu E Yingming Wen Jiayun Dan Youyuan Jiang Guangchao Wei Jiaxin Cui Jiangxi Provincial key laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and TechnologyNanchang330013China International Institute for Innovation Jiangxi University of Science and TechnologyNanchang330013China Ironmaking Plant Xiangtan Iron and Steel Corporation of Hunan HualingXiangtan411101China Schoolof Transportation and Vehicle enginering Shandong University of TechnologyZibo255000China

Cohesive zone plays a vital role in the stable operation of a blast furnace(BF),yet the complex phase change process of iron ore particles in this zone is still not well *** this study,a novel one-dimensional(1D)unsteady phase change model was developed to elucidate the heat transfer and melting mechanisms of iron ore *** model validation,the effects of several key operating parameters(e.g.,particle diameter,gas velocity,initial temperature)on the phase change behavior of iron ore particles were analyzed,and the joint effect of multiple parameters was *** results show that larger-sized iron ore particles possess lower specific surface areas,which in turn reduces their convective heat absorption ***,the distance from the solid-liquid phase interface to the particle surface increases,thereby slowing down the movement of the phase interface and pro-longing the melting duration of the *** the gas velocity and the initial temperature does not have a significant impact on reducing the duration of the complete melting *** the specified conditions,it is observed that increasing the gas velocity by 3-fold and 9-fold results in a reduction of the melting duration by 2.4%and 8.3%,*** the initial temperature of iron ore particles results in a decrease in the core-to-surface temperature difference,a slower heating rate,and a shorter duration to achieve *** the factors affecting the melting process,the particle diameter is found to be the most significant in terms of the liquid phase precipitation,mushy zone thickness,and core-to-surface temperature difference of iron ore particles.

关键词： Blast furnace Iron ore melting Cohesive zone Heat transfer Phase change

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Spatial diversion and coordination of flood water for an urban flood control project in Suzhou, China

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Water Science and Engineering 2024年第2期17卷 108-117页

作者： Yu Xu You-peng Xu Qiang Wang Yue-feng Wang Chao Gao Department of Geography and Spatial Information Techniques Ningbo UniversityNingbo 315211China State key laboratoryof Hydology Water Resources and Hydraulic enginering Nanjing Hydraulic Research InstitueNanjing 210029China laboratory of Sustainable Urban Drainage Ningbo UniversityNingbo 31521lChina Schol of Gegraphical and Oceanographic Sciences Nanjing UniversiyNanjing 210023China School of Geography and Tourism Chongqing Normal UniversityChongqing 401331China

Suzhou City,located in the Yangtze River Delta in China,is prone to flooding due to a complex combination of natural factors,including its monsoon climate,low elevation,and tidally influenced position,as well as intensive human *** Large Encirclement Flood Control Project(LEFCP)was launched to cope with serious floods in the urban *** project changed the spatiotemporal pattern of flood processes and caused spatial diversion of floods from the urban area to the outskirts of the ***,this study developed a distributed flood simulation model in order to understand this transition of flood *** results revealed that the LEFCP effectively protected the urban areas from floods,but the present scheduling schemes resulted in the spatial diversion of floods to the outskirts of the *** rainstorm frequencies of 10.0%to 0.5%,the water level differences between two representative water level stations(Miduqiao(MDQ)and Fengqiao(FQ))located inside and outside the LEFCP area,ranged from 0.75 m to 0.24 m and from 1.80 m to 1.58 m,*** addition,the flood safety margin at MDQ and the duration with the water level exceeding the warning water level at FQ ranged from 0.95 m to 0.43 m and from 4 h to 22 h,*** scheduling schemes for the hydraulic facilities of the LEFCP in extreme precipitation cases were developed ac-cording to food simulations under seven scheduling *** helps to regulate the spatial flood diversion caused by the LEFCP during extreme precipitation.

关键词： Urban flooding Urban flood control project Rainstorm fregue ncy Flood simulation model Suzhou City

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单原子在铝合金中的扩散迁移行为:可解释机器学习加速第一原理计算方法

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Science China Materials 2024年第4期67卷 1140-1149页

作者：黄敬涛薛景腾李明伟程源来忠红胡津周飞曲囡刘勇朱景川 School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China National key laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China National key laboratory of Science and Technology on Advanced Composites in SpecialEnvironments Harbin Institute of TechnologyHarbin 150001 China Center for Analysis Measurement and ComputingHarbin Institute of TechnologyHarbin 150001China State key laboratory for Environment-friendly Energy Materials School of Materials Science and EngineringSouthwest University of Science and TechnologyMianyang 621010China

本文采用机器学习加速第一原理计算的方法,研究了铝基体中单原子的扩散迁移行为.建立铝基体中三十多种单原子扩散迁移行为的小样本数据集,以原子半径、离子半径和第一电离能等固有参数作为输入特征值,合金原子与空位之间的相互作用能以... 详细信息

本文采用机器学习加速第一原理计算的方法,研究了铝基体中单原子的扩散迁移行为.建立铝基体中三十多种单原子扩散迁移行为的小样本数据集,以原子半径、离子半径和第一电离能等固有参数作为输入特征值,合金原子与空位之间的相互作用能以及合金原子在铝基体中的扩散势垒作为输出参数.通过相关性分析初步确定描述符与预测目标之间的关系,并利用递归特征消除法确定不同目标的输入特征和描述符数量.通过交叉验证证明所选模型的先进性,并进行微调以优化其性能.为了验证其效率和准确性,CatBoost模型经过了传统算法的严格测试.利用训练有素的模型预测周期表中其他单原子在铝基体中的扩散迁移行为.机器学习加速第一原理计算的结果可为进一步开发新型铝合金提供理论依据.

关键词：机器学习扩散迁移交叉验证输出参数单原子第一原理计算原子半径小样本数据

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用于常见疾病成像的纳米材料造影剂

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Science China Materials 2024年第4期67卷 1288-1291页

作者：邢洁李子厚姚俊列吴爱国 Ningbo key laboratory of Biomedical Imaging Probe Materials and Technology Zhejiang International Cooperation Base of Biomedical Materials Technology and Application Chinese Academy of Sciences (CAS) Key Laboratory of Magnetic Materials and Devices Ningbo Cixi Institute of Biomedical Engineering Zhejiang Engineering Research Center for Biomedical Materials Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Advanced Energy Science and Technology Guangdong laboratory

生物医学精准诊断对于疾病的有效治疗十分重要.纳米基成像造影剂具有灵敏度高、特异性强、生物相容性好等特点,在生物医学成像诊断中具有巨大的临床转化潜力.目前,尽管研究者们构筑了大量的纳米基探针材料作为疾病诊断造影剂,但纳米材... 详细信息

生物医学精准诊断对于疾病的有效治疗十分重要.纳米基成像造影剂具有灵敏度高、特异性强、生物相容性好等特点,在生物医学成像诊断中具有巨大的临床转化潜力.目前,尽管研究者们构筑了大量的纳米基探针材料作为疾病诊断造影剂,但纳米材料造影剂在临床转化方面仍然面临极大的挑战.这里我们主要概述了不同生物医学成像类型的纳米基造影剂所面临的问题,并针对这些难题提出了应对方案和未来的研究重点,最后对纳米基造影剂的临床转化前景进行了展望.

关键词：造影剂生物医学成像疾病诊断应对方案生物相容性纳米材料临床转化有效治疗

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Click Modification for Polysaccharides via Novel Tunnel Transmission Phenomenon in Ionic Liquids

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Research 2022年第2期2022卷 315-322页

作者： Yan Zhou Jinming Zhang Yaohui Cheng Xin Zhang Jin Wu Jun Zhang cas key laboratory of enginering plastic CAS Research/Education Center for Excllence in Molecular SciencesInstitte of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China University of Chinese Academy 0f Sciences Bejing 10049China

It is extremely dificult toachievearapid and effcient modifcationofnatural polysaccharides,due tothe intrinsicstrong hydrogen bonding networks and the slow mass transfer process during the reaction ***,we found a fascinating anion-tunnel transmission phenomenon in the imidazolium-based ionic liquids with carboxylate anions.A novel click esterification of natural polysaccharides thus was demonstrated undera catalyst-free condition within a very short reaction time of15min at *** a super-rapid and highly eficient modification strategy is available for various polysaccharides(clluoe,starchinulin,pululan,dextranand xylan),difrentesterifcatonreactions(acetication,propionation benzoylation,and cyclohexylformylation),and high concentrations,claiming a revolutionary potential in polysaccharide chemistry industries.

关键词： process bonding catalyst

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Does social information affect the settlement decisions of resident birds in their second breeding attempt?A case study of the Japanese Tit(Parus minor)

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Avian Research 2024年第3期15卷 326-335页

作者： Xudong Li Jiangping Yu Dake Yin Longru Jin Keqin Zhang Li Shen Zheng Han Haitao Wang Jilin enginering Labonatony for Arian Eecology ani Comsenvanion Garetis School of Lfe S&ciencesNorthaust Normal UnvesityGhangchuan130024China School of Bcology and Ervirormnt Baotou Toachars'College Baoton014000China Jilin Prorncial key labonatary of Animal Reource Consenvation and Urlisation Northeat Normal UntversityChangchun130024 Chine School of Zlogicail Sciance Jhlia Agialural Scaince and Tecrhnology UnversiyJlim132109China No.87 Middle School of Changchun Changchun130062China

Individuals may gather information about environmental conditions when deciding where to breed in order to maximize their lifetime *** can obtain social information by observing conspecifics and heterospecifics with similar ecological *** studies have shown that birds can rely on social information to select their nest *** location of active nests and the reproductive success of conspecifics and heterospecifics can provide accurate predictions about the quality of the breeding *** short-lived species can facultatively reproduce two and/or more times within a breeding ***,few studies have focused on how multiplebrooding individuals select nest sites for their second breeding *** this study,we use long-term data to test whether the Japanese Tit(Parus minor)can use social information from conspecifics and/or heterospecifics(the Eurasian Nuthatch Sitta europaea,the Daurian Redstart Phoenicurus auroreus and the Yellow-rumped Flycatcher Ficedula zanthopygia)to select a nest site for the second breeding *** results showed that the nest boxes occupied by tits on their second breeding attempt tended to be surrounded by more breeding conspecific nests,successful first nests of conspecifics,and fewer failed first nests of conspecifics than the nest boxes that remained unoccupied(the control group).However,the numbers of breeding heterospecific nests,successful heterospecific nests,and failed heterospecific nests did not differ between the nest boxes occupied by tits on their second breeding attempt and the unoccupied nest ***,the tits with local successful breeding experience tended to choose areas with more successful first nests of conspecifics than those without successful breeding ***,we suggest that conspecifics'but not heterospecifics'social information within the same breeding season is the major factor influencing the nest site selection of Japanese Tits during second breeding attempts.

关键词： Conepeific Heterospecifie Japanese tits Multiple brooding Nest-site selection Public infomation Social information

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Electronic Properties of Passive Films Formed on G3 and G30 Nickel-based Alloys in Bicarbonate/Carbonate Buffer Solution

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Chemical Research in Chinese Universities 2011年第2期27卷 304-312页

作者： LI Dang-guo WANG Jia-dao CHEN Da-rong State key laboratory of Tribology School of Mechanical Enginering Tsinghua University Beijing 100084 P. R. China

The electronic properties of passive films formed on G3 and G30 alloys in bicarbonate/carbonate buffer solution were comparatively studied by electrochemical impedance spectra（EIS） and Mott-Schottky analysis, the chemical composition of the passive film formed on G3 alloy was detected by X-ray photoelectron spectroscopy （XPS）. The results show that passive film on G3 alloy had better protection than that on G30 alloy. The transfer resistance, film resistance and diffusion resistance of the passive films on both alloys increased with increasing formation potential, prolonging formation time, increasing pH value, decreasing formation temperature, and decreasing chloride and sulphide ions concentration. Mott-Schottky plot reveals that the passive films on the two alloys show a p-n semi-conductive character. XPS analysis indicates that the passive film on G3 alloy was composed of an inner Cr oxide and an outer Fe, Mo/Ni oxides.

关键词： Nickel-based alloy Electronic property Passive film

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