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Effects of heat input on layer heterogeneity of selective laser melting Ti-6Al-4V components

China Welding 2023年第3期32卷 51-66页

作者：陈昌荣刘畅王乾廷练国富黄旭冯美艳戴继成 School of Mechanical and Automotive Engineering Fujian University of TechnologyFuzhou 350118China Fujian Provincial Precision Processing Manufacturing Engineering Research Center Fuzhou 350118China School of Materials Science and Engineering Fujian University of TechnologyFuzhou 350118 China Fujian Provincial Key Laboratory of Advanced Materials Processing and Application Fuzhou 350118 China Haian Rubber Group Co. Ltd.Putian 351254China

Due to the layer-by-layer manufacturing characteristics,metallurgical process of selective laser melting(SLM)is inherently dif-ferent in the building direction because of varying conditions,thereby resulting inter-layer *** mitigate such anisotropy,it is of great significance to understand the effects of processing parameters on the property evolution and thus metallurgy of fabrication *** research proposes one-factor-at-a-time experiment to investigate the influences of laser power and scanning speed on the surface qual-ity,microstructures and mechanical properties of selective laser melted Ti-6Al-4V *** quality is assessed by roughness around the printings while mechanical properties are evaluated through microhardness and tensile *** in microstructure are quantified by XRD to correlate with mechanical *** morphology is analyzed to understand the effect of defects and microstructure on mechanical *** optimized parameter corresponding to best surface quality and mechanical properties has been found respect-ively in laser power of 190 W and scanning speed of 800 mm/*** optimization,surface roughness has decreased by 44.47%for upper *** strength,tensile strength and elongation rate have improved by 13.17%,43.34%and 64.51%,respectively,with similar hardness and Young’s *** addition,heterogeneity of mechanical properties has great improvement by a range of 31.63%-92.68%.

关键词： selective laser melting Ti-6Al-4V inter-layer heterogeneity tensile properties heat input

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Effects of Ultrasonic and Microwave Pretreatments on Calcium Chelating Capacity, Structure and Stability of Walnut Meal Protein Peptides

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Shipin Kexue/Food science 2024年第8期45卷 193-201页

作者： Men, Deying Wang, Zengli Xiang, Quanyan Tao, Liang Dai, Jiahe Liu, Litong Tian, Yang College of Food Science and Technology Yunnan Agricultural University Kunming650201 China Development and Utilization of Food and Drug Homologous Resources Engineering Research Center of the Ministry of Education Kunming650201 China Yunnan Key Laboratory of Precision Nutrition and Personalized Food Manufacturing Kunming650201 China

In this study, a mixture of ultrasound or microwave pretreated walnut meal protein peptides and CaCl2 was used for the preparation of walnut peptide-calcium chelate. The effects of different pretreatments on the calcium chelating capacity, structural changes and stability of walnut meal protein peptides were analyzed. The results showed that compared with walnut meal protein peptide-calcium chelate (WPP-Ca), the chelation rates of ultrasound-pretreated walnut meal protein peptide-calcium chelate (UP-WPP-Ca) and microwave-pretreated walnut meal protein peptide-calcium chelate (MP-WPP-Ca) were enhanced, which indicated that ultrasound and microwave pretreatments improved the calcium-chelating capacity of the peptides effectively. Using ultraviolet-visible (UV-Vis) absorption spectroscopy and Fourier transform infrared (FTIR) spectroscopy, it was found that ultrasound and microwave pretreatments mainly affected the calcium ion binding sites such as amino groups, carbonyl groups, carboxyl groups, amide bonds and carboxylate groups of walnut meal protein peptides. The results of X-ray diffraction (XRD) showed that ultrasound and microwave treatments changed the molecular arrangement of walnut meal protein peptides, thereby making the structure of walnut peptide-calcium chelate more ordered. Fluorescence spectroscopy showed that ultrasonic and microwave treatments promoted the chelation between aromatic amino acids and calcium ions. In addition, UP-WPP-Ca and MP-WPP-Ca showed good stability toward different pH values, temperatures, and gastrointestinal digestion. In short, ultrasonic and microwave pretreatments can improve the calcium-chelating capacity and stability of walnut meal protein peptides, which is of guiding significance for the processing of walnut peptide-calcium chelate and the development of calcium supplements. © 2024 Chinese Chamber of Commerce. All rights reserved.

关键词： Calcium

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Walnut green husk polyphenols ameliorate type 2 diabetes in C57BL/6 mice by the gut microbiota and IRS/PI3K/AKT signaling pathway

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Food science and Human Wellness 2025年

作者： Xia Hu Jing Xie Zi-Shan Hong Yue-Xiu Pan Jun Sheng Yang Tian College of Food Science and Technology， Yunnan Agricultural University Engineering Research Center of Development and Utilization of Food and Drug Homologous Resources， Ministry of Education， Yunnan Agricultural University Yunnan Provincial Key Laboratory of Precision Nutrition and Personalized Food Manufacturing， Yunnan Agricultural University Yunnan Provincial Engineering Research Center for Edible and Medicinal Homologous Functional Food， Yunnan Agricultural University Puer University

Walnut green husk， a byproduct of walnut processing， is rich in polyphenols with potential antidiabetic effects. However， the antidiabetic activity of walnut green husk polyphenols (WGHP) in vivo has not been reported and their mechanism of action is still unclear. This study investigated its impact on type 2 diabetes in mice induced by a high-fat diet and streptozotocin. We found that walnut green husk polyphenols improved glycolipid metabolism， reduced inflammation and oxidative stress， and protected the pancreas and liver. WGHP also reshaped the gut microbiota， lowering the Firmicutes/Bacteroidota ratio and boosting beneficial bacteria. Network pharmacology indicated that WGHP's effects are mediated by the PI3K/AKT signaling pathway， which was confirmed by increased protein expression of p-IRS-1， PI3K， p-AKT， and GLUT4 in the liver. In conclusion， these results indicate that WGHP ameliorates T2DM by modulating gut microbiota and the IRS/PI3K/AKT pathway， providing a theoretical basis for the in-depth utilization of walnut green husk.

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Bayesian Game-Based Comfort Trading Strategies for Temperature Regulation in Smart Grids

Bayesian Game-Based Comfort Trading Strategies for Temperatu...

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On-Line Conference (ONCON), Industrial Electronics Society Annual

作者： Xiaocheng Wang Pengjiao Sun Na Wang Jia Guo Tianjin Key Laboratory of Wireless Mobile Communications and Power Transmission College of Electronic and Communication Engineering Tianjin Normal University Tianjin China Wu Yue Aviation Technology Precision Manufacturing Co. Ltd. Tianjin China

ISBN: (数字)9798331540319

ISBN: (纸本)9798331540326

This paper proposes a Heating, Ventilating, and Air Conditioning (HVAC) comfort-level trading model designed to incentivize HVAC systems to provide more Frequency Regulation Service (FRS) for the smart grid. The model first categorizes HVAC systems into two layers: a leader layer with low comfort adjustment levels and a follower layer with high comfort adjustment levels. A Stackelberg game is then established between the leader and follower layers to optimize customer utility. Simultaneously, a Bayesian game model is developed for the HVAC systems in the follower layer, which aims to maximize the utility of customers while enabling the leader layer to provide regulatory services. Finally, simulation results demonstrate that the proposed comfort trading model effectively keeps HVAC temperature setpoints within acceptable comfort ranges and enhances customer satisfaction.

关键词： Temperature distribution HVAC Simulation Atmospheric modeling Games Regulation Probability distribution Iterative algorithms Smart grids Bayes methods

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Fabrication of Aln Ceramics with a Wide Range Of Electrical Resistivity by Hot-Pressing Sintering

SSRN

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SSRN 2023年

作者： Luo, Qian Li, Chen-Hui Zhou, Nian-Ying Hu, Liang Pang, Yun Zou, Yang State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Precision Manufacturing Institute Wuhan University of Science and Technology PR Wuhan430081 China Wuhan University of Science and Technology China

AlN ceramics were prepared by hot-pressing sintering with 0.2 wt% CaO as an additive at a range of sintering temperatures from 1700℃ to 1900℃. The effects of CaO doping on the phase composition, microstructure, electrical properties, and thermal conductivity of AlN ceramics were systematically investigated. The addition of CaO not only enhanced the sintering process of AlN ceramics, but also significantly reduced the electrical resistivity and increased the thermal conductivity. The relative density of CaO-doped AlN ceramics reached 98.88% at 1700°C, with a thermal conductivity of 81.51 W•m-1•K-1. XRD and AC impedance spectroscopy were used to analyze the impurities and defects in AlN ceramics. The lattice parameters and fitting grain resistance indicated that CaO-doped AlN presented a higher lattice oxygen concentration, leading to an increase in the concentration of Al vacancies and electrons. Moreover, the level of dissolved oxygen could be controlled by altering the sintering temperature, resulting in AlN ceramics with electrical resistivity ranging from 8.1×106 Ω•cm to 1.7×1012 Ω•cm. Further research was conducted to investigate the effect of the electrical resistivity of AlN ceramics on the J-R type electrostatic adsorption force, and it was found that AlN ceramics with a specific resistivity of 109 Ω•cm had the highest electrostatic adsorption of 351.7 g/cm2. © 2023, The Authors. All rights reserved.

关键词： Aluminum nitride

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Optical meta-waveguides for integrated photonics and beyond

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Light(science & Applications) 2021年第12期10卷 2263-2306页

作者： Yuan Meng Yizhen Chen Longhui Lu Yimin Ding Andrea Cusano Jonathan A.Fan Qiaomu Hu Kaiyuan Wang Zhenwei Xie Zhoutian Liu Yuanmu Yang Qiang Liu Mali Gong Qirong Xiao Shulin Sun Minming Zhang Xiaocong Yuan Xingjie Ni State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua University100084 BeijingChina Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing and School of Information Science and TechnologyFudan UniversityShanghai 200433China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Department of Electrical Engineering Pennsylvania State UniversityUniversity ParkPA 16802USA Optoelearonic Division Department of EngineeringUniversity of Sannio1-82100 BeneventoItaly Department of Electrical Engineering Stanford UniversityStanfordCA 94305USA Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Key Laboratory of Photonic Control Technology Ministry of EducationTsinghua University100084 BeijingChina Yiwu Research Institute of Fudan University Chengbei RoadYiwu City 322000 ZhejiangChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074 HubeiChina

The growing maturity of nanofabrication has ushered massive sophisticated optical structures available on a photonic *** integration of subwavelength-structured metasurfaces and metamaterials on the canonical building block of optical waveguides is gradually reshaping the landscape of photonic integrated circuits,giving rise to numerous metawaveguides with unprecedented strength in controlling guided electromagnetic ***,we review recent advances in meta-structured waveguides that synergize various functional subwavelength photonic architectures with diverse waveguide platforms,such as dielectric or plasmonic waveguides and optical *** results and representative applications are comprehensively *** physical models with explicit design tutorials,either physical intuition-based design methods or computer algorithms-based inverse designs,are cataloged as *** highlight how meta-optics can infuse new degrees of freedom to waveguide-based devices and systems,by enhancing light-matter interaction strength to drastically boost device performance,or offering a versatile designer media for manipulating light in nanoscale to enable novel *** further discuss current challenges and outline emerging opportunities of this vibrant field for various applications in photonic integrated circuits,biomedical sensing,artificial intelligence and beyond.

关键词： waveguides waveguide beyond

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Hyperentangled-state generation in nanophotonic periodically poled lithium niobate waveguides

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Physical Review Applied 2025年第2期23卷 024030-024030页

作者： Yanghe Chen Bo Ji Tengfei Wu Guangqiang He SJTU Pinghu Institute of Intelligent Optoelectronics Department of Electronic Engineering Shanghai Jiao Tong University 200240 Shanghai China Science and Technology on Metrology and Calibration Laboratory Changcheng Institute of Metrology & Measurement Aviation Industry Corporation of China 100095 Beijing China State Key Laboratory of Precision Spectroscopy East China Normal University 200062 Shanghai China

Hyperentanglement is a promising resource in the realm of quantum communication, owing to its exploitation of multiple degrees of freedom. In this paper, we report the generation of a two-mode hyperentangled state using one nanophotonic periodically poled lithium niobate waveguide. Our approach encompasses the manipulation of polarization, energy-time, and quadrature amplitude-phase degrees of freedom. Theoretical calculations reveal that the magnitude of the Clauser-Horne-Shimony-Holt parameter |S| can reach 2.375 even considering the multi-photon-pair generation effect, which is indicative of the entanglement in the polarization degree of freedom. Further analysis involved computing the joint spectral amplitude of the two-mode state, followed by Schmidt decomposition and Fourier transformation. The resulting joint uncertainty product Δ(ωs+ωi)Δ(ts−ti)=0.4113, implying that high-quality energy-time entanglement is achieved. Notably, the von Neumann entropy Sr of our source reaches 0.192, confirming the presence of quadrature amplitude-phase entanglement within the generated state. Moreover, we theoretically apply our source in a free-space quantum key distribution system to demonstrate its potential to increase secret key rates. Our proposed scheme is an efficient and practical approach for facilitating high-capacity quantum communication systems.

关键词： Quantum communication

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Co_(3)O_(4)纳米阵列电催化膜电极及其处理难降解废水耦合产氢性能研究

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science China Materials 2023年第2期66卷 651-663页

作者：殷昭慧张琨马娜刘晰尹振王虹杨雪王晔秦学涛成丹阳郑玉梅王丽丽李建新徐宗伟唐娜程博闻肖德泉马丁 Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization College of Chemical Engineering and Materials ScienceTianjin University of Science and TechnologyTianjin 300457China State Key Laboratory of Precision Measuring Technology and Instruments Centre of MicroNano Manufacturing TechnologyTianjin UniversityTianjin 300072China School of Chemistry and Chemical Engineering -Center for Physical ScienceShanghai Jiao Tong UniversityShanghai 200240China SynCat@Beijing Synfuels China Technology Co.Ltd.Beijing 101407China State Key Laboratory of Separation Membranes and Membrane Processes Separation Membrane Science and Technology International Joint Research CentreTiangong UniversityTianjin 300387China Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Center for Integrative Materials Discovery University of New HavenWest HavenCT 06516USA

传统电化学高级氧化技术存在有机物降解效率不高、能耗大的弊端,并且平板式电极表面存在滞止边界层,严重限制了传质过程.本工作中,我们首先通过水热方法将一维Co_(3)O_(4)纳米针状阵列结构原位负载于金属钛膜电极,低压电场下,实现难降... 详细信息

传统电化学高级氧化技术存在有机物降解效率不高、能耗大的弊端,并且平板式电极表面存在滞止边界层,严重限制了传质过程.本工作中,我们首先通过水热方法将一维Co_(3)O_(4)纳米针状阵列结构原位负载于金属钛膜电极,低压电场下,实现难降解有机物的去除,其中:对于苯酚的去除率可达≥99%,化学需氧量(COD)和总有机碳(TOC)去除率分别为99.5%和92.5%,电流效率为88.7%,能耗仅为0.061 kW h(kg COD)^(-1).Co_(3)O_(4)纳米针的阵列式膜电极可以提供更多的CoOOH活性位,增强电场强度,而且其穿透式流体模式导致强化对流,可以明显地改善电催化反应过程的传质,因而提高膜电极的催化效率,降低能耗.最后,我们设计了H型电催化膜反应器,耦合阴极的析氢反应,降解有机物的同时制备纯氢,极大地提高了电极和膜反应器的效率.

关键词：有机物降解难降解废水电催化反应膜电极电化学高级氧化技术膜反应器电场强度平板式

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Forming Mechanism and Laws of Anti-Barrel Shape Upon Ultrasonic-Assisted Upsetting

SSRN

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SSRN 2023年

作者： Chen, Junlang Zhu, Ningyuan School of Mechanical and Electrical Engineering Jiangxi University of Science and Technology Ganzhou341000 China Guangdong Key Laboratory of Precision Equipment and Manufacturing Technique South China University of Technology Guangzhou510641 China

The anti-barrel shape could be produced by ultrasonic-assisted upsetting, but the forming mechanism still lack of in-depth research. In this work, basing on the different types of moving and deforming trajectory of cylindrical specimen in the forming process, we divided the process of ultrasonic-assisted upsetting into three types for discussion: impact forming, periodic impact-compression forming and periodic compression forming. Impact forming is based on the radial expansion of the end caused by the alternating impact beyond the critical velocity, which occurs aperiodically and forms the anti-barrel shape. Periodic impact-compression forming is based on that the expansion formed during the reflection of shock wave in the specimen end is bigger than the shrinkage, accompanying by the generated outward friction, then forms the initial anti-barrel shape. With the attenuation of the shock wave and the continuous increasement of the compression in a vibration cycle, the direction of friction gradually turns inward, and the middle of the initial anti-barrel begins to expand. Finally, a residual anti-barrel of plastic deformation is formed and then accumulated periodically. Periodic compression forming is based on the periodic elastic relaxation of the end face of the specimen, which reduces the average friction coefficient and the deformation degree of the barrel-shape compared to conventional upsetting. Through the experimental study of ultrasonic-assisted hot upsetting on the cylindrical aluminum alloy 6061-T6, the composite forming mechanism in the process of periodic impact-compression forming was verified, and the forming laws of anti-barrel shape was revealed. © 2023, The Authors. All rights reserved.

关键词： Friction

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Post-Processing Time-Aware Optimal Scheduling of Single Robotic Cluster Tools

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IEEE/CAA Journal of Automatica Sinica 2020年第2期7卷 597-605页

作者： Qing Hua Zhu Yan Qiao NaiQi Wu Yan Hou School of Computer Science and Technology Guangdong University of TechnologyGuangzhou 510006China Institute of Systems Engineering Macao University of Science and TechnologyTaipa 999078MacaoChina State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong University of TechnologyGuangzhou 510006China

Integrated circuit chips are produced on silicon *** cluster tools are widely used since they provide a reconfigurable and efficient environment for most wafer fabrication *** advances in new semiconductor materials bring about new functionality for integrated *** a wafer is processed in a processing chamber,the wafer should be removed from there as fast as possible to guarantee its high-quality integrated ***,maximization of the throughput of robotic cluster tools is *** work aims to perform post-processing time-aware scheduling for such tools subject to wafer residencytime *** do so,closed-form expression algorithms are derived to compute robot waiting time accurately upon the analysis of particular events of robot waiting for singlearm cluster *** are given to show the application and effectiveness of the proposed algorithms.

关键词： Cluster tool discrete event systems optimization robotic systems scheduling

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