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Structural evolution and high-temperature sensing performance of polymer-derived SiAlBCN ceramics

Journal of Advanced Ceramics 2024年第4期13卷 478-485页

作者： Chao Ma Kun Liu Pengfei Shao Daoyang Han Kang Wang Mengmeng Yang Rui Zhao hailong Wang Rui Zhang Gang Shao School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Zhongyuan Critical Metal Laboratory Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentZhengzhou UniversityZhengzhou 450002China

In situ temperature monitoring has become extremely imperative in high-temperature harsh environments and polymer-derived ceramics(PDCs)as sensing materials have attracted great ***,the stability and oxidation/corrosion resistance of PDCs cannot be simultaneously achieved at the moment,limiting their practical ***,polymer-derived SiAlBCN ceramics were synthesized via polymer conversion method under different pyrolysis *** microstructure evolution,high temperature sensing properties,and stability were investigated in *** results show that the amorphous SiAlBCN phase grows more orderly and the size of the free carbon phase enlarges with the increasing *** defect concentration displays a decreasing ***,the SiAlBCN ceramics as sensing materials exhibit a good temperature-resistance property from roo temperature to 1100℃.The fabricated SiAlBCN temperature sensor possesses excellent stability,repeatability,and ***,SiAlBCN ceramics exhibit distinguished oxidation/corrosion resistance after 100 h treatment at 1200℃in a water/oxygen environment,which is attributed to their low corrosive rate constant(0.57 mg/(cm^(2)·h))and oxidative rate constant(3.43 mg^(2)/(cm^(4)·h)).Therefore,polymer-derived SiAlBCN ceramics as sensing materials,which possess outstanding stability and oxidation/corrosion resistance,have great potential for in-situ monitoring of extreme environmental temperatures in the future.

关键词： polymer-derived SiAlBCN ceramics temperature sensor harsh environments oxidation and corrosion resistance

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Enhanced electromagnetic wave absorption via optical fiber-like PMMA@Ti_(3)C_(2)T_(x)@SiO_(2) composites with improved impedance matching

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Nano Research 2024年第3期17卷 1676-1686页

作者： Huanhuan Niu Xuewen Jiang Wei Li Zhiyu Min Budi Riza Putra Wulan Tri Wahyuni hailong Wang Rui Zhang Bingbing Fan School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China School of Materials Science and Engineering Tongji UniversityShanghai 201804China Department of Materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany School of Material Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China Research Center for Metallurgy National Research and Innovation Agency(BRIN)PUSPIPTEK Gd.470South TangerangBanten 15315Indonesia Analytical Chemistry Division Department of ChemistryFaculty of Mathematics and Natural SciencesIPB UniversityWest Java 16680Indonesia

Ti_(3)C_(2)T_(x) nanosheets have attracted significant attention for their potential in electromagnetic wave absorption(EWA).However,their inherent self-stacking and exorbitant electrical conductivity inevitably lead to serious impedance mismatch,restricting their EWA ***,the optimization of impedance matching becomes *** this work,we developed polymethyl methacrylate(PMMA)@Ti_(3)C_(2)T_(x)@SiO_(2) composites with a sandwich-like core–shell structure by coating SiO_(2) on PMMA@Ti_(3)C_(2)T_(x).The results demonstrate that the superiority of the SiO_(2) layer in combination with PMMA@Ti_(3)C_(2)T_(x),outperforming other relative graded distribution structures and meeting the requirements of EWA *** resulting PMMA@Ti_(3)C_(2)T_(x)@SiO_(2) composites achieved a minimum reflection loss of-58.08 dB with a thickness of 1.9 mm,and an effective absorption bandwidth of 2.88 *** analysis revealed that the structural design of SiO_(2) layer not only optimized impedance matching,but also synergistically enhanced multiple loss mechanisms such as interfacial polarization and dipolar ***,this work provides valuable insights for the future preparation of high-performance electromagnetic wave absorbing Ti_(3)C_(2)T_(x)-based composites.

关键词： polymethyl methacrylate(PMMA)@Ti_(3)C_(2)T_(x)@SiO_(2)composites impedance match SiO_(2)layer optical fiber-like structure interfacial polarization and dipolar polarization

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Mapping multiple phases in curcumin binary solid dispersions by fluorescence contrasting

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Chinese Chemical Letters 2024年第09期 292-298页

作者： Ying Xu Chengying Shen hailong Yuan Wei Wu Key Laboratory of Smart Drug Delivery of MOE School of Pharmacy Fudan University Department of Pharmacy Air Force Medical Center PLA Jiangxi Provincial People's Hospital The First Affiliated Hospital of Nanchang Medical College Center for Medical Research and Innovation Shanghai Pudong Hospital Fudan University Pudong Medical Center

The microphases and miscibility in binary curcumin(Cur) solid dispersions(SDs) with amorphous polyvinylpyrrolidone K30(PVP K30) and semi-crystalline poloxamer(P407) and poly(ethylene glycol)6000(PEG6000) as carriers were investigated by fluorescence contrasting utilizing confocal laser scanning microscopy. A super sensitive fluorophore P4 with typical aggregation-caused quenching properties was employed to stain the continuous polymer phases and contrasted with the autofluorescence of the model drug Cur. In addition, differential scanning calorimetry(DSC) and powder X-ray diffraction(PXRD)were utilized to assist in explanation of the fluorescence results. In all three SD systems, there is always a homogenous polymer phase stained by P4 and it is difficult to adulterate Cur crystals by P4. Cur-enriched rather than polymer-enriched domains could be detected. In the Cur-PVP K30 system, Cur exists in an amorphous form at a Cur loading level of 50% and below, while Cur crystallines phase out and continuously grow with the increase of Cur loading from 60% to 90%. The phase behaviors in the Cur-P407 and Cur-PEG 6000 systems are similar but with minor differences. In both systems, Cur phases out as clusters of drug-enriched domains at a loading level of 20% and below, which however cannot be correlated with crystallization, as evidenced by both DSC and PXRD. There is a transition from an amorphous to a crystalline state from 20% to 30% Cur loading, above which Cur crystallines can be detected. It is interesting that a co-mix phase of both Cur-and PEG 6000-enriched domains can be identified at Cur loading levels of 10% and less. Taking together, it is concluded that contrasting Cur autofluorescence with the signals of P4 proves to be a functional strategy to reveal multiple phases in the binary SD systems investigated.

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Enhancing electromagnetic wave absorption with core‐shell structured SiO_(2)@MXene@MoS_(2)nanospheres

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Carbon Energy 2024年第8期6卷 90-104页

作者： Xuewen Jiang Qian Wang Limeng Song Hongxia Lu Hongliang Xu Gang Shao hailong Wang Rui Zhang Changan Wang Bingbing Fan School of Material Science and Engineering Zhengzhou UniversityZhengzhouHenanChina Henan Key Laboratory of Aeronautical Materials and Application Technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhouHenanChina School of Materials Science and Engineering Tsinghua UniversityBeijingChina

Material composition and structural design are important factors influencing the electromagnetic wave(EMW)absorption performance of *** alleviate the impedance mismatch attributed to the high dielectric constant of Ti_(3)C_(2)T_(x)MXene,we have successfully synthesized core‐shell structured SiO_(2)@MXene@MoS_(2)*** architecture,comprising SiO_(2)as the core,MXene as the intermediate layer,and MoS_(2)as the outer shell,is achieved through an electrostatic self‐assembly method combined with a hydrothermal *** complex core‐shell structure not only provides a variety of loss mechanisms that effectively dissipate electromagnetic energy but also prevents self‐aggregation of MXene and MoS_(2)***,the synergistic combination of SiO_(2)and MoS_(2)with highly conductive MXene enables the suitable dielectric constant of the composites,ensuring optimal impedance ***,the core‐shell structured SiO_(2)@MXene@MoS_(2)nanospheres exhibit excellent EMW absorption performance,featuring a remarkable minimum reflection loss(RL_(min))of−52.11 dB(2.4 mm).It is noteworthy that these nanospheres achieve an ultra‐wide effective absorption bandwidth(EAB)of 6.72 *** work provides a novel approach for designing and synthesizing high‐performance EMW absorbers characterized by“wide bandwidth and strong reflection loss.”

关键词： core‐shell structure electromagnetic wave absorption multiloss mechanism SiO_(2)@MXene@MoS_(2)

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Towards optimized tensor code generation for deep learning on sunway many-core processor

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Frontiers of Computer Science 2024年第2期18卷 1-15页

作者： Mingzhen LI Changxi LIU Jianjin LIAO Xuegui ZHENG hailong YANG Rujun SUN Jun XU Lin GAN Guangwen YANG Zhongzhi LUAN Depei QIAN State Key Laboratory of Software Development Environment Beijing 100191China School of Computer Science and Engineering Beihang UniversityBeijing 100191China National University of Singapore Singapore 119077Singapore State Key Laboratory of Mathematical Engineering and Advanced Computing Wuxi 214000China Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing 100854China Department of Computer Science and Technology Tsinghua UniversityBeijing 100084China

The flourish of deep learning frameworks and hardware platforms has been demanding an efficient compiler that can shield the diversity in both software and hardware in order to provide application *** the existing deep learning compilers,TVM is well known for its efficiency in code generation and optimization across diverse hardware *** the meanwhile,the Sunway many-core processor renders itself as a competitive candidate for its attractive computational power in both scientific computing and deep learning *** paper combines the trends in these two ***,we propose swTVM that extends the original TVM to support ahead-of-time compilation for architecture requiring cross-compilation such as *** addition,we leverage the architecture features during the compilation such as core group for massive parallelism,DMA for high bandwidth memory transfer and local device memory for data locality,in order to generate efficient codes for deep learning workloads on *** experiment results show that the codes generated by swTVM achieve 1.79x improvement of inference latency on average compared to the state-of-the-art deep learning framework on Sunway,across eight representative *** work is the first attempt from the compiler perspective to bridge the gap of deep learning and Sunway processor particularly with productivity and efficiency in *** believe this work will encourage more people to embrace the power of deep learning and Sunwaymany-coreprocessor.

关键词： sunway processor deep learning compiler code generation performance optimization

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NiCo/Al_(2)O_(3)nanocatalysts for the synthesis of 5-amino-1-pentanol and 1,5-pentanediol from biomass-derived 2-hydroxytetrahydropyran

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Green Chemical Engineering 2024年第1期5卷 119-131页

作者： Jian Yang Jia Zhang Enrico Benassi Xuemei Li hailong Liu Weiguo Fang Junying Tian Chungu Xia Zhiwei Huang State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China School of Petrochemical Engineering Lanzhou University of TechnologyLanzhou730050China Novosibirsk State University Novosibirsk630090Russia University of Chinese Academy of Sciences Beijing100049China

Al_(2)O_(3)-supported monometallic Ni,Co,and bimetallic Ni-Co nanocatalysts originated from layered double hydroxide precursors were synthesized by co-precipitation method,and used for the synthesis of useful 5-amino-1-pentanol(5-AP)and 1,5-pentanediol(1,5-PD)by reductive amination(RA)or direct hydrogenation of biofurfuralderived 2-hydroxytetrahydropyran(2-HTHP),*** both reactions,the yield of the target products decreased monotonously with the increasing amounts of Co in the NiCo/Al_(2)O_(3)catalysts,owing probably to the replacement of highly reactive Ni by Co component with inferior hydrogenation activity at the low reaction temperature of 60℃.However,the incorporation of Co could improve the reducibility of the NiCo/Al_(2)O_(3)bimetallic catalysts and promote the reaction stability of the catalysts,especially for Ni_(2)Co1/Al_(2)O_(3),in both reactions with over 180 h *** of the catalysts before and after the reaction showed that the incorporating Co could inhibit the sintering of metal particles and hinder the surface oxidation of the more reactive Ni0species,thanks to the formation of Ni-Co alloy in the bimetallic ***-based modeling of the reaction mechanisms is also performed,supporting the reaction pathway proposed previously and also the much higher activity of Ni in the RA of 2-HTHP as compared with Co.

关键词： NiCo bimetallic catalysts Layered double hydroxide Reductive amination Amino alcohol Quantum chemical calculations

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真实型领导影响员工工作投入的多重中介效应

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心理科学 2014年第3期37卷 716-722页

作者：李永鑫周海龙田艳辉河南大学心理与行为研究所 69231部队解放军西安通信学院

为了探讨真实型领导影响员工工作投入的内在作用机制,采用量表法对308名企业员工进行调查,采用结构方程建模的方法对真实型领导影响员工工作投入的多重中介效应进行检验,结果显示:(1)真实型领导对员工的工作投入具有显著的正向预测作用... 详细信息

为了探讨真实型领导影响员工工作投入的内在作用机制,采用量表法对308名企业员工进行调查,采用结构方程建模的方法对真实型领导影响员工工作投入的多重中介效应进行检验,结果显示:(1)真实型领导对员工的工作投入具有显著的正向预测作用。(2)职业认同、情感承诺和组织支持感分别在真实型领导和工作投入间起中介作用,三个变量的并式多重中介效应在真实型领导和工作投入间起完全中介效应。(3)职业认同、情感承诺、组织支持感的特定中介作用分别占总间接效应的44.0%、42.4%和13.6%。结论:职业认同、情感承诺和组织支持感在真实型领导影响员工工作投入的过程中起完全中介作用。

关键词：真实型领导职业认同情感承诺组织支持感工作投入多重中介

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一维云模型控制器在平衡控制系统中的应用

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计算机测量与控制 2011年第11期19卷 2695-2698页

作者：高键周海龙李众江苏科技大学电子信息学院江苏镇江212003 常州信息职业技术学院电子与电气工程学院江苏常州213164

云模型控制理论是智能控制学科的新兴领域,该理论从提出至今,主要以理论研究和仿真实验为主。针对云模型理论的研究现状,提出了基于单片机的一维云模型控制器的设计方法,应用该方法设计的云模型控制器成功实现了对轮式机器人平衡系统的... 详细信息

云模型控制理论是智能控制学科的新兴领域,该理论从提出至今,主要以理论研究和仿真实验为主。针对云模型理论的研究现状,提出了基于单片机的一维云模型控制器的设计方法,应用该方法设计的云模型控制器成功实现了对轮式机器人平衡系统的控制。轮式机器人动态平衡实测数据表明,一维云模型控制器可以保证轮式机器人定位系统具有良好的控制性能和较强的干扰性,证明了该设计的有效性和科学性,为今后云模型控制器设计提供了一定的参考。

关键词：云模型云模型控制器轮式机器人单片机平衡系统

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关于铁路货运增量对策探讨

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铁道货运 2019年第10期37卷 34-39页

作者：周海龙中国铁路太原局集团有限公司货运部

为深化落实国家交通强国建设和运输结构调整战略部署,通过比较分析近年来全国公路、铁路、水路运输增量、占比情况,从当前公路竞争力度大、市场走势难预测、铁路自身制约因素较多等不利方面,以及宏观政策支撑、行业基本面持续改善、铁... 详细信息

为深化落实国家交通强国建设和运输结构调整战略部署,通过比较分析近年来全国公路、铁路、水路运输增量、占比情况,从当前公路竞争力度大、市场走势难预测、铁路自身制约因素较多等不利方面,以及宏观政策支撑、行业基本面持续改善、铁路进入发力期等有利方面,剖析铁路货运量增量的影响因素;从货源结构、运力资源、路企协调出发,提出聚力推进“公转铁”运输、发到端联动协同组织、多管齐下提高吸引力等铁路中短期货运增量对策,以及与上下游企业融合发展、发展铁路现代物流、按需设计物流产品等铁路中长期发展对策。

关键词：铁路货运增量运输结构影响因素市场环境发展对策

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铁路GSM-R系统核心网改造工程方案研究

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铁路通信信号工程技术 2023年第9期20卷 36-41页

作者：周海龙中国铁路呼和浩特局集团有限公司呼和浩特010050

基于铁路GSM-R系统核心网改造的需求,提出改造方案。针对MSC改造,提出R4网络架构主备MSC方式和R4网络架构MSC Pool方式,并进行方案比选;针对SGSN改造,提出兼容两种BSC/PCU的组网方案,并进行方案比选;针对GGSN改造,提出两种冗余方式。并... 详细信息

基于铁路GSM-R系统核心网改造的需求,提出改造方案。针对MSC改造,提出R4网络架构主备MSC方式和R4网络架构MSC Pool方式,并进行方案比选;针对SGSN改造,提出兼容两种BSC/PCU的组网方案,并进行方案比选;针对GGSN改造,提出两种冗余方式。并从站址选择、承载网通道提出了相应需求。最后探讨新旧核心网设备割接的方案。

关键词： GSM-R核心网冗余组网 MSC SGSN GGSN 业务割接

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