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In-situ synthesis,microstructure,and properties of NbB_(2)-NbC-Al_(2)O_(3)composite coatings by plasma spraying

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Journal of Advanced Ceramics 2022年第8期11卷 1263-1278页

作者： Xiaolong WANg Yong YANg Shitong JIA Yanwei WANg yuduo MA Yuhang CUI Xingyu WANg Wenwei SUN Liang WANg Key Lab.for New Type of Functional Materials in Hebei Province School of Materials Science and EngineeringState Key Laboratory of Reliability and Intelligence of Electrical EquipmentTianjin Key Laboratory of Materials Laminating Fabrication and Interface Control TechnologyHebei University of TechnologyTianjin 300401China Integrated Computational Materials Research Centre Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China

The high melting point and strong chemical bonding of NbB_(2)pose a great challenge to the preparation of high-density nanostructured NbB_(2)composite ***,we report a novel,simple,and efficient method to fabricate in-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating by plasma spraying Nb_(2)O_(5)–B_(4)C–Al composite powder,aiming at realizing the higher densification and ultra-fine microstructure of NbB_(2)composite *** microstructure and properties of in-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating were studied comparatively with ex-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating(plasma spraying NbB_(2)–NbC–Al_(2)O_(3)composite powder).The reaction mechanism of Nb_(2)O_(5)–B_(4)C–Al composite powder in plasma jet was analyzed in *** results showed that the in-situ nanostructured NbB_(2)–NbC–Al_(2)O_(3)composite coating presented a lower porosity and superior performance including higher microhardness,toughness and wear resistance compared to the plasma sprayed ex-situ NbB_(2)–NbC–Al_(2)O_(3)coating.and other boride composite *** of the in-situ NbB_(2)–NbC–Al_(2)O_(3)coating was attributed to the low melting point of Nb_(2)O_(5)–B_(4)C–Al composite powder and the exothermic effect of in-situ *** superior performance was ascribed to the density improvement and the strengthening.and toughening effect of the nanosized *** in-situ reaction path could be expressed as:Nb_(2)O_(5)+Al®Nb+Al_(2)O_(3),and Nb+B_(4)C®NbB_(2)+NbC.

关键词： NbB_(2)-NbC-Al_(2)O_(3)composite coating plasma spray in-situ synthesis Nb_(2)O_(5)-B_(4)C-Al system

Microstructure and properties evolution of plasma sprayed Al_(2)O_(3)-Y_(2)O_(3) composite coatings during high temperature and thermal shock treatment

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Journal of Rare Earths 2021年第6期39卷 718-727,I0004页

作者： Xingyu Wang Xiaolong Wang Xiaowen Sun Yong Yang Chen Zhang yuduo Ma Yuhang Cui Yanchun Dong Dianran Yan You Wang Key Lab.for New Type of Functional Materials in Hebei Province State Key Laboratory of Reliability and Intelligence of Electrical EquipmentTianjin Key Laboratory of Materials Laminating Fabrication and Interface Control TechnologySchool of Materials Science and EngineeringHebei University of TechnologyTianjin 300132China Department of Materials Science Harbin Institute of TechnologyHarbin 150001China

Al_(2)O_(3)-Y_(2)O_(3) composite powder with TiO_(2) additive was plasma sprayed to prepare Al_(2)O_(3)-Y_(2)O_(3) composite *** micro structure and properties evolution of the Al_(2)O_(3)-Y_(2)O_(3) coatings during high temperature and thermal shock resistance were *** results show that the micro structure of the Al_(2)O_(3)-Y_(2)O_(3)-TiO_(2) coating is more uniform than that of the Al_(2)O_(3)-Y_(2)O_(3) ***,amorphous phase is formed in the two *** Al_(2)O_(3)-Y_(2)O_(3)(-TiO_(2)) coatings were heat treated for 2 h at temperatures of 800,1000 and 1200℃,*** is found that the microstructure and properties of the two coatings have no obvious change at 800℃.Some of the amorphous phase is crystallized at1000℃,and meanwhile Y_(2)O_(3) and Al_(2)O_(3) react to form YAg phase and YAM *** 1200℃,all of the amorphous phases are *** heat treatment,the micro hardness of the two coatings is *** thermal shock resistance of the Al_(2)O_(3)-Y_(2)O_(3) system coatings can be improved by using TC4 titanium alloy as substrate and with NiCrAlY bonding ***,the Al_(2)O_(3)-Y_(2)O_(3)-TiO_(2) coating exhibits better thermal shock resistance due to the addition of TiO_(2).

关键词： Al_(2)O_(3)-Y_(2)O_(3)coating TiO_(2) Plasma spraying Thermal shock resistance Microstructure evolution

Strong stability of an optimal control hybrid system in fed-batch fermentation

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International Journal of Biomathematics 2018年第4期11卷 1-17页

作者： Zhenyu Dong Bing Tan yuduo Zhang Jinlong Yuan Enmin Feng Hongchao Yin Zhilong Xiu School of Mathematical Sciences Dalian University of Technology Dalian 116024 Liaoning P. R. China School of Energy and Power EngineeringDalian University of Technology Dalian 116024 Liaoning P. R. China Economics and Technology Research InstituteChina National Petroleum Corporation Beijing 100724 P. R. China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 Liaoning P. R. China School of Mathematics and Statistics Nanyang Normal UniversityNanyang 473061 Henan P. R. China College of Science Dalian Minzu University Dalian 116600 Liaoning P. R. China Department of MathematicsSchool of Science Dalian Maritime University Dalian 116026 Liaoning P. R. China School of Mathematical SciencesDalian University of Technology Dalian 116025 Liaoning P. R. China School of Life Science and BiotechnologyDalian University of Technology Dalian 116024 Liaoning P. R. China

In this paper, we consider a nonlinear hybrid dynamic （NHD） system to describe fedbatch culture where there is no analytical solutions and no equilibrium points. Our goal is to prove the strong stability with respect to initial state for the NHD system. To this end, we construct corresponding linear variational system （LVS） for the solution of the NHD system, also prove the boundedness of fundamental matrix solutions for the LVS. On this basis, the strong stability is proved by such boundedness.

关键词： Nonlinear hybrid system linear variational system fundamental matrix solution strong stability.

Magnetic Nanomotor-Based Maneuverable SERS Probe

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Research 2020年第1期2020卷 1455-1467页

作者： Yong Wang Yuhuan Liu Yang Li Dandan Xu Xi Pan yuduo Chen Dekai Zhou Bo Wang Huanhuan Feng Xing Ma Flexible Printed Electronic Technology Center and School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Shenzhen Bay Laboratory No.9 Duxue RoadShenzhen 518055China School of Materials Engineering Shanghai University of Engineering ScienceShanghai 201620China Key Laboratory of Microsystems and Microstructures Manufacturing Harbin Institute of TechnologyHarbinHeilongjiang 150001China

Surface-enhanced Raman spectroscopy(SERS)is a powerful sensing technique capable of capturing ultrasensitive fingerprint signal of analytes with extremely low ***,conventional SERS probes are passive nanoparticles which are usually massively applied for biochemical sensing,lacking controllability and adaptability for precise and targeted sensing at a small ***,we report a“rod-like”magnetic nanomotor-based SERS probe(MNM-SP)that integrates a mobile and controllable platform of micro-/nanomotors with a SERS sensing ***“rod-like”structure is prepared by coating a thin layer of silica onto the self-assembled magnetic ***,SERS hotspots of silver nanoparticles(AgNPs)are decorated as detecting *** MNM-SPs can be navigated on-demand to avoid obstacles and target sensing sites by the guidance of an external gradient magnetic *** applying a rotating magnetic field,the MNM-SPs can actively rotate to efficiently stir and mix surrounding fluid and thus contact with analytes quickly for SERS ***,we demonstrate the self-cleaning capability of the MNM-SPs which can be used to overcome the contamination problem of traditional single-use SERS ***,the MNM-SPs could precisely approach the targeted single cell and then enter into the cell by *** is worth mentioning that by the effective mixing of intracellular biocomponents,much more informative Raman signals with improved signal-to-noise ratio can be captured after active ***,the demonstrated magnetically activated MNM-SPs that are endowed with SERS sensing capability pave way to the future development of smart sensing probes with maneuverability for biochemical analysis at the micro-/nanoscale.

关键词： field Probe silver

计及电制氢和碳捕集的园区综合能源系统动态规划

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中国石油大学学报（自然科学版） 2024年第2期48卷 142-150页

作者：王艳松王毓铎中国石油大学(华东)新能源学院山东青岛266580

“碳达峰,碳中和”目标对综合能源系统提出了低碳高效的新要求。针对园区综合能源系统的源-网-荷-储联合规划问题,基于Bellman最优理论将系统净收益最大化的规划模型进行分解,建立“风光储协同-多能互联耦合-能源消纳制氢-最优碳捕集”... 详细信息

“碳达峰,碳中和”目标对综合能源系统提出了低碳高效的新要求。针对园区综合能源系统的源-网-荷-储联合规划问题,基于Bellman最优理论将系统净收益最大化的规划模型进行分解,建立“风光储协同-多能互联耦合-能源消纳制氢-最优碳捕集”的多阶段动态规划模型并求解设备的最佳配置方案。结果表明,该模型在经济性和环保性方面具有显著优势,电制氢收益可观并促进电能就地消纳,碳捕集降低了系统碳排放并具有售卖CO_(2)气体和碳配额的双重收益,同时在动态规划过程中达到了最佳的电制氢配置和最优的碳捕集比例。

关键词：园区综合能源系统低碳动态规划电制氢碳捕集

经济政策不确定性与异质性企业就业变动:理论与实证研究

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当代经济科学 2019年第5期41卷 106-115页

作者：逯宇铎杜小飞大连理工大学经济管理学院

经济政策不确定性阻碍了全球经济复苏,是导致经济衰退的重要原因。在此背景下,本文将就业变动细分为就业创造、就业破坏和就业净增长三个指标,从理论和实证两个层面考察经济政策不确定性对企业就业的影响。结果发现:经济政策不确定性一... 详细信息

经济政策不确定性阻碍了全球经济复苏,是导致经济衰退的重要原因。在此背景下,本文将就业变动细分为就业创造、就业破坏和就业净增长三个指标,从理论和实证两个层面考察经济政策不确定性对企业就业的影响。结果发现:经济政策不确定性一方面削弱了企业的就业创造能力,另一方面提高了企业的就业破坏程度,两方面综合作用显著抑制了企业就业净增长。进一步引入企业异质性的检验发现,国有控股的企业性质通过就业创造和就业破坏两个渠道对上述抑制效应具有正向调节作用,补贴和出口对上述抑制效应分别具有正向和负向调节作用,但仅通过就业创造一个渠道发挥作用,就业破坏渠道不明显。

关键词：经济政策不确定性企业就业异质性就业创造就业破坏就业净增长

“双碳”目标下房山区食用菌产业发展思路与实践

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北方园艺 2024年第7期 133-138页

作者：张玉铎北京市房山区种植业技术推广站北京102446

食用菌生产是生物碳循环的重要载体,变农林“废碳”为蛋白食品,但是在栽培过程中也需要消耗能源,增加碳排放,在“双碳”目标视角下,介绍了房山区食用菌产业模式和规模,阐述了食用菌生产过程碳循环和排放规律,分析了食用菌产业对“双碳... 详细信息

食用菌生产是生物碳循环的重要载体,变农林“废碳”为蛋白食品,但是在栽培过程中也需要消耗能源,增加碳排放,在“双碳”目标视角下,介绍了房山区食用菌产业模式和规模,阐述了食用菌生产过程碳循环和排放规律,分析了食用菌产业对“双碳”目标实现的影响,计算了平菇、香菇、鹿茸菇等种类的单位产量灭菌过程消耗能源量和碳排放量,提出了房山区食用菌发展变革思路,并对近年来节能减排的探索实践和取得的成效进行了介绍,为不同地区食用菌产业在“双碳”目标下的发展提供参考依据。

关键词：食用菌 “双碳”目标碳排放灭菌

Underdetermined Speech Source Separation Based on Hybrid Clustering

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Underdetermined Speech Source Separation Based on Hybrid Clu...

第40届中国控制会议

作者： Peng Qiu Yiqiong Zhang yuduo Wang Quan Yin Qingyi Wang School of Artificial Intelligence and Automation Huazhong University of Science and Technology School of Automation China University of Geosciences(Wuhan)

Since the number of observed signals is less than the number of source signals,underdetermined blind source separation(UBSS) is a kind of ill-posed blind source separation(BSS) *** well-known "two-step approach" based on sparse component analysis(SCA) is the main method to solve this problem,and mixed matrix estimation is a key *** UBSS algorithm based on mixed clustering is proposed in this ***,an affinity propagation(AP) clustering algorithm based on the density deviation sampling is used to estimate the number of source signals and the initial clustering *** K-means clustering algorithm is used to estimate the mixing matrix ***,the minimum l-norm method is used to separate the source *** algorithm can not only reduce the computational complexity,but also solve the problem of unknown number of source *** on speech signal separation show that the proposed algorithm can improve the estimation accuracy of mixed matrix and has good separation performance.

关键词： Underdetermined blind source separation(UBSS) Affinity propagation(AP) clustering K-means clustering Density deviation sampling

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浅析《周易》若干思想对创新管理的启示

科技管理研究 2010年第A1期30卷 228-230页

作者：逯宇铎钱谊大连理工大学经济系国际贸易所辽宁大连116023

《周易》作为中华民族古老智慧的集中体现,其一系列思想对当代企业成功开展创新管理有诸多启示:"盛德大业"道出了创新目标对创新绩效的重大意义;"四象八卦"告诉我们创新源自于企业系统有序的创新组织结构;"生生谓之易"提醒企业要不断地... 详细信息

《周易》作为中华民族古老智慧的集中体现,其一系列思想对当代企业成功开展创新管理有诸多启示:"盛德大业"道出了创新目标对创新绩效的重大意义;"四象八卦"告诉我们创新源自于企业系统有序的创新组织结构;"生生谓之易"提醒企业要不断地对其创新组织结构和创新战略进行评估与调整;《周易》的辩证思想强调了企业一方面应以自主创新为本,另一方面又要善于集成创新和消化吸收再创新;《周易》的发展思想指导企业应在不同的发展阶段采取不同的创新策略。

关键词：创新创新管理周易启示