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Effect of austenitizing condition on mechanical properties,microstructure and precipitation behavior of AISI H13 steel

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Journal of Iron and Steel Research International 2024年第1期31卷 143-156页

作者： An-gang Ning Yang Liu Rui Gao Stephen Yue Ming-bo Wang han-jie Guo College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024ShanxiChina Department of Mining and Materials Engineering McGill UniversityMontrealQCH3A 0C5Canada ASSAB Tooling Technology(Chongqing)Co. Ltd.Chongqing401120China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China

The effects of austenitizing temperature(1223,1303,and 1373 K)and holding time(1-1500 s)on the microstructure,mechanical properties,and precipitation behavior of the H13 hot work die steel were *** results indicate a softening phenomenon when H13 steel is austenitized at 1303 K beyond 900 s and 1373 K beyond 600 s,*** the sample held for 1200 s,the tensile strength is found capable of reaching up to 2.2 GPa when quenched from a temperature above 1303 ***,prior-austenite grain size increases with the increase in austenitizing *** kinetic behavior of the precipitates(mainly MC-type carbides)in H13 steel could be elaborated through the principles set forth by the Arrhenius and Avrami ***,the comprehensive strengthening of the H13 steel was discussed in *** results show that the activation energy of the transformed fraction of carbides is higher than that of the diffusion process for common alloying elements(Cr,V,Mo,and Ni)found in the *** suggests that it would be difficult for precipitates to dissolve into the matrix when H13 steel is austenitized at high *** the increasing austenitizing temperature,the precipitation fraction decreases,and the dislocation density *** dislocation strengthening is regarded as the dominant strengthening contributed to yield strength in as-quenched H13 steel.

关键词： H13 steel Austenitizing Mechanical property Precipitation behavior Comprehensive strengthening

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Mid-infrared computational temporal ghost imaging

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Light(Science & Applications) 2024年第6期13卷 1088-1097页

作者： han Wu bo Hu Lu Chen Fei Peng Zinan Wang Goery Genty Houkun Liang College of Electronics and Information Engineering Sichuan UniversityChengduSichuan610064China College of Electrical Engineering Sichuan UniversityChengduSichuan610064China Key Lab of Optical Fiber Sensing&Communications University of Electronic Science&Technology of ChinaChengduSichuan611731China Laboratory of Photonics Tampere UniversityFI-33014TampereFinland

Ghost imaging in the time domain allows for reconstructing fast temporal objects using a slow *** technique involves correlating random or pre-programmed probing temporal intensity patterns with the integrated signal measured after modulation by the temporal ***,the implementation of temporal ghost imaging necessitates ultrafast detectors or modulators for measuring or pre-programming the probing intensity patterns,which are not available in all spectral regions especially in the mid-infrared ***,we demonstrate a frequency downconversion temporal ghost imaging scheme that enables to extend the operation regime to arbitrary wavelengths regions where fast modulators and detectors are not *** approach modulates a signal with temporal intensity patterns in the near-infrared and transfers the patterns to an idler via difference-frequency generation in a nonlinear crystal at a wavelength where the temporal object can be *** a proof-of-concept,we demonstrate computational temporal ghost imaging in the mid-infrared with operating wavelength that can be tuned from 3.2 to 4.3μ*** scheme is flexible and can be extended to other *** results introduce new possibilities for scan-free pump-probe imaging and the study of ultrafast dynamics in spectral regions where ultrafast modulation or detection is challenging such as the mid-infrared and THz regions.

关键词： ghost Ghost scheme

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Process optimization and mechanism study of ionic liquid-based mixed amine biphasic solvents for CO_(2) capture in biogas upgrading procedure

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Frontiers of Environmental Science & Engineering 2024年第8期18卷 43-57页

作者： Fanzhi Meng Siyu han Li Lin Jinglin Li Kailun Chen jianguo jiang School of Environment Tsinghua UniversityBeijing 100084China

This study focused on enhancing the efficiency of methane upgrading and reducing energy consumption in the biogas upgrading process through the use of biphasic *** aqueous-based biphasic solvent,comprising methyl monoethanolamine(MMEA),N-methyldiethanolamine(MDEA),and 1-butyl-3-methylimidazolium tetrafluoroborate(ItFB),was meticulously *** biogas upgrading effect,regeneration efficiency,regeneration energy consumption,economic viability,selectivity,and phase separation characteristics of this absorbent were systematically *** parameters,including different inlet flow rates,stirring rate,methane inlet concentrations,reaction temperatures,and amine mixing ratios,were adjusted to investigate their impact.A comprehensive evaluation was conducted on the biogas upgrading effect and substance migration trends of the biphasic *** process parameters were determined,demonstrating the favorable impact of the biphasic solvent on biogas *** upgraded gas achieved a methane purity exceeding 96%,and the regeneration energy consumption decreased by 44.27% compared to 30 wt.%MEA,resulting in a more than 50% improvement in economic *** interaction between the ionic liquid and carbamate facilitated the phase separation process,with carbon enrichment after separation exceeding 95%.This enhancement significantly contributed to the improvement of regeneration energy *** study thus concludes that biphasic solvents,exemplified by the described aqueous-based solution,offer a promising avenue for effective biogas upgrading with notable advancements in economic and energy efficiency.

关键词： Biphasic solvents Biogas upgrading Energy consumption Process parameters Ionic liquid

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A data-driven model of drop size prediction based on artificial neural networks using small-scale data sets

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Chinese Journal of Chemical Engineering 2024年第2期66卷 71-83页

作者： bo Wang han Zhou Shan Jing Qiang Zheng Wenjie Lan Shaowei Li Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Beijing 102249China State Key Laboratory of Chemical Engineering Tsinghua UniversityBeijing 100084China

An artificial neural network(ANN)method is introduced to predict drop size in two kinds of pulsed columns with small-scale data *** training,the deviation between calculate and experimental results are 3.8%and 9.3%,*** ANN model,the influence of interfacial tension and pulsation intensity on the droplet diameter has been *** size gradually increases with the increase of interfacial tension,and decreases with the increase of pulse *** can be seen that the accuracy of ANN model in predicting droplet size outside the training set range is reach the same level as the accuracy of correlation obtained based on experiments within this *** two kinds of columns,the drop size prediction deviations of ANN model are 9.6%and 18.5%and the deviations in correlations are 11%and 15%.

关键词： Artificial neural network Drop size Solvent extraction Pulsed column Two-phase flow Hydrodynamics

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A green cross-linking method for the preparation of renewable threedimensional graphene sponges for efficient adsorption of Congo red dye

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Chinese Journal of Chemical Engineering 2024年第2期66卷 84-93页

作者： Zhuang Liu bo Gao Haoyuan han Yuling Li Haiyang Fu Donghui Wei Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China

Graphene-based materials possess significant potential for the treatment of dye wastewater due to their exceptional adsorption properties toward stubborn ***,their utilization is hindered by high preparation costs,low yields,environmental pollution during synthesis,and challenges in regenerating the *** study proposes a novel approach to address these limitations by developing nitrogen-doped three-dimensional(3D)polyvinyl alcohol(PVA)crosslinked graphene sponges(N-PGA)using a cross-linking method with ammonium *** method offers a relatively mild,environmentally friendly *** carbonate serves as both a reducing and modifying agent,facilitating the formation of the intrinsic structure of N-PGA and acting as a nitrogen ***,PVA is utilized as the cross-linking *** results demonstrate that N-PGA exhibits a favorable internal 3D hierarchical porous structure and possesses robust mechanical *** measured specific surface area(BET)of N-PGA was as high as406.538 m^(2)·g^(-1),which was favorable for its efficient adsorption of Congo red(CR)dye *** an initial concentration of 50 mg·L^(-1),N-PGA achieved an impressive removal rate of 89.6%and an adsorption capacity of 112 mg·g^(-1)for CR ***,it retained 79%of its initial adsorption capacity after 10 cycles,demonstrating excellent regeneration *** summary,the synthesized N-PGA displays remarkable efficacy in the adsorption of CR dye in wastewater,opening up new possibilities for utilizing 3D porous graphene nanomaterials as efficient adsorbents in wastewater treatment.

关键词： Green chemistry Graphene sponge Adsorbents Adsorption Congo red Regeneration

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High-precision nondestructive evaluation of a thermal barrier coating based on perovskite quantum dot anion exchange

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Nano Research 2024年第5期17卷 4582-4592页

作者： Tao han Shufang Ding Zifan Wang Sirong jiang Pengjiang Jing Tianshang Yi Yaqi Chen Chunzhi jiang Xiaofeng Zhang Microelectronics and Optoelectronics Technology Key Laboratory of Hunan Higher Education School of Physics and Electronic Electrical EngineeringXiangnan UniversityChenzhou 423000China National Engineering Laboratory for Modern Materials Surface Engineering Technology&The Key Lab of Guangdong for Modern Surface Engineering Technology Guangdong Institute of New MaterialsGuangdong Academy of SciencesGuangzhou 510650China

Thermal barrier coatings(TBCs)in gas turbine engines are used in expressly harsh environments;thus,assessing TBC integrity status is critical for safety and ***,traditional periodic maintenance involves visual inspections of the TBCs,requiring the gas turbine to be decommissioned and partially *** importantly,tiny defects or internal damages that easily cause coating failure cannot be *** this work,a new nondestructive evaluation(NDE)technique of TBCs based on quantum dot(QD)anion exchange is first explored *** exchanging anions between the Cl ions and the CsPbBr_(3) QDs,the degrees of salt corrosion of the TBCs are *** resultant NDE technique shows that the colour of the TBCs obviously changes from green to blue,accompanied by a large blueshift(~100 nm)of the photoluminescence(PL)peak *** addition,the relationship between the PL peak position and coating thermophysical properties indicates that the precision of this NDE technique may easily identify theμm-level of the thermal growth oxide(TGO)changes inside the TBCs.

关键词： thermal barrier coatings nondestructive evaluation CsPbBr_(3)quantum dot anion exchange thermal growth oxide

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Compact magneto-optical traps using planar optics

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Chinese Physics B 2024年第9期33卷 93-108页

作者： Zhi Tan bo Lu Chengyin han Chaohong Lee Institute of Quantum Precision Measurement State Key Laboratory of Radio Frequency Heterogeneous IntegrationCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong) Shenzhen 518045China

Magneto-optical traps (MOTs) composed of magnetic fields and light fields have been widely utilized to cool andconfine microscopic particles. Practical technology applications require miniaturized MOTs. The advancement of planaroptics has promoted the development of compact MOTs. In this article, we review the development of compact MOTs basedon planar optics. First, we introduce the standardMOTs. We then introduce the gratingMOTs with micron structures, whichhave been used to build cold atomic clocks, cold atomic interferometers, and ultra-cold sources. Further, we introducethe integrated MOTs based on nano-scale metasurfaces. These new compact MOTs greatly reduce volume and powerconsumption, and provide new opportunities for fundamental research and practical applications.

关键词： magneto-optical trap (MOT) planar optics grating MOT metasurface MOT

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工业化理论的演化:维度、路径与逻辑

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税务与经济 2011年第1期 1-6页

作者：韩江波暨南大学经济学院广东广州510632

工业化不仅是社会生产力和经济持续增长的动态变化过程,也是经济结构、经济制度、经济体制的变革过程。以往学者只是简单地对工业化理论进行梳理和总结,而没有深层次研究工业化理论之间的存在维度、演化路径和演化逻辑。实质上,对工业... 详细信息

工业化不仅是社会生产力和经济持续增长的动态变化过程,也是经济结构、经济制度、经济体制的变革过程。以往学者只是简单地对工业化理论进行梳理和总结,而没有深层次研究工业化理论之间的存在维度、演化路径和演化逻辑。实质上,对工业化理论的研究应持一种全面、系统、开放、多维的视角,且在统一的分析框架内进行。马克思主义工业化理论遵循的演化逻辑与生产力跨越发展合二为一;西方工业化理论遵循的演化逻辑与经济、人口、资源、科技、环境紧密结合、不可分割。新型工业化是这两种工业化理论演化路径的统一体。

关键词：工业化理论马克思主义工业化理论西方工业化理论

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集群外延式竞争力和内涵式竞争力的形成解构——基于要素演化的视角

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首都经济贸易大学学报 2010年第4期12卷 29-36页

作者：韩江波暨南大学经济学院广东广州510632

集群竞争力虽历来成为学界的关注点,但现有文献对其形成路径的研究仍很缺乏。基于要素演化的视角,可以把集群竞争力分为集群外延式竞争力和集群内涵式竞争力,并在此基础上对两者的组合结构和形成路径进行研究。由于集群外延式竞争力建... 详细信息

集群竞争力虽历来成为学界的关注点,但现有文献对其形成路径的研究仍很缺乏。基于要素演化的视角,可以把集群竞争力分为集群外延式竞争力和集群内涵式竞争力,并在此基础上对两者的组合结构和形成路径进行研究。由于集群外延式竞争力建立在边际收益递减的有形要素基础之上,虽然由于无形要素的嵌入延长了其边际收益递减的拐点,但最终集群外延式竞争力难以克服由有形要素本身的限制带来的弊端。集群若要实现真正意义上的竞争力就必须过渡到以内涵式竞争力而带动的整个集群的提升,并在此基础上再向更高层次的集群内涵式竞争力过渡。

关键词：集群竞争力有形要素无形要素

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我国智能制造发展的案例对比与路径创新研究

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技术经济与管理研究 2019年第1期 87-94页

作者：韩江波南阳师范学院经济与管理学院河南南阳473061

作为新一轮工业革命的核心技术,智能制造不仅成为中国制造业变革的核心,而且可被视为我国制造业转型升级的制高点与未来发展方向。智能型制造是制造业数字化、网络化、智能化,其是企业为逐步适应激烈的全球市场竞争而发展起来的一种崭... 详细信息

作为新一轮工业革命的核心技术,智能制造不仅成为中国制造业变革的核心,而且可被视为我国制造业转型升级的制高点与未来发展方向。智能型制造是制造业数字化、网络化、智能化,其是企业为逐步适应激烈的全球市场竞争而发展起来的一种崭新生产范式,经历单件小批量制造范式、大规模生产范式、大规模定制范式以及智能制造范式的演变过程。德国工业4.0与中国制造2025在发展背景、基本框架、重点突破领域、执行目标、行动路径以及未来前景规划等方面,具有较为明显的迥异性。德国在制造业领域具有较强的竞争力,其制定的工业4.0作为对未来制造业发展的战略规划,对中国制造2025的完善及其在实践中的推进具有非常重要的战略理念启示价值。为积极发展智能制造,进而抢占未来国际制造业竞争的制高点,应从以下几方面推进中国智能制造的发展:一是陆续落实创新驱动,强化顶层设计,坚持标准先行;二是不断强化制造业"两化"的深度融合,启动国家智能制造大型专项工程建设,逐步推动制造业的智能化;三是借助于互联网大力发展与智能制造相关的个性定制、网络化制造以及服务型制造;四是不断拓宽政策覆盖面并完善创新政策体系,增强相关政策的支撑和保障功能。

关键词：智能制造中国制造2025 德国工业4.0 互联网

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