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Fabrication of silica-based ceramic cores with internal lattice structures by stereolithography

China Foundry 2022年第5期19卷 369-379页

作者： Ke-hui Hu Hao-yuan Wang Kuan Lu Qian Feng Dao-ding Yang Jian Cao Bo Zhang Zhi-gang Lü Xing Ran State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Ten Dimensions(Guangdong)Technology Co. Ltd.Foshan 528225GuangdongChina Guizhou Anji Aviation Investment Casting Co. Ltd.Anshun 561003GuizhouChina Key Laboratory of Advanced Materials Processing Technology Ministry of EducationTsinghua UniversityBeijing 100084China

Ceramic cores are widely used in investment casting,and ideal properties of cores are essential for high-quality *** the circumstances requiring thick cores,solid cores are likely to encounter deformation and cracking defects due to the accumulation of ***,with the superiority of ceramic stereolithography in producing complex ceramic parts,hollow cores with lattice structures were designed and *** dimensional accuracy and properties of the green and sintered bodies were *** show the dimensional accuracy of sintered cores is controlled within±0.25 mm benefited from the precise green *** mechanical properties are not obviously *** bending strength reaches 11.94 MPa at room temperature and 12.87 MPa at 1,500℃ with a creep deformation of 0.345 ***,casting verifications prove that the hollow cores meet the requirements of investment *** casting surfaces are obtained,at the same time,the core-removal efficiency is improved by over 3 times.

关键词： silica ceramic cores stereolithography lattice structure investment casting

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Microstructuring Conductive Electrospun Mats for Enhanced Electro‑active Biofilm Growth and High‑Performance Bioelectrocatalysis

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advanced Fiber Materials 2023年第5期5卷 1699-1711页

作者： Min Li Hao Lu Jiadong Hu Xuemei Xiang Yanling Zheng Wenhu Gao Wei Sun Wei Wang Zhisong Lu Yan Qiao Institute for Clean Energy and Advanced Materials School of Materials and EnergySouthwest UniversityChongqing 400715People’s Republic of China Sino‑Singapore Joint Laboratory of Materials and Technologies for Proactive Health Monitoring School of Materials and EnergySouthwest UniversityChongqing 400715People’s Republic of China Experimental Center for Virtual Simulation of Sports and Health Southwest UniversityChongqing 400715People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University TechnologyWuhan 430070People’s Republic of China Hubei Longzhong Lab Xiangyang 441000People’s Republic of China Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province College of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou 571158People’s Republic of China Singapore Institute of Manufacturing Technology Singapore 138669Singapore

Electrospun materials have attracted considerable attention in microbial fuel cells(MFC)owing to their porous structures,which facilitate the growth of electro-active biofilms(EABs).However,the impact of fiber diameter-controlled porous architectures on EAB growth and MFC performance has not been extensively ***,a highly conductive polypyrrole-modified electrospun polyacrylonitrile(PAN)mat was prepared as an electrode material for Shewanella putrefaciens CN32-based *** dominant pore size of the corresponding mat increases from 1 to around 20μm as the fiber diameter increases from 720 to 3770 *** variation affects the adhesion and growth behaviors of electrochemically active bacteria on the mat-based *** electrodes with poresranging from 2 to 10μm allow bacterial penetration into the interior,leading to significant biofilm loading and effective ***,the tight lamination of the electrospun fibers restricts bacterial growth in the deep interior *** developed a friction-induced triboelectric expanding approach to rendering the mats with layered structures to overcome this *** inter-layer spaces of the expanded conductive mat can facilitate bacterial loading from both sides of each layer and serve as channels to accelerate the catalysis of organic ***,the expanded conductive mat with appropriate pore sizes delivers superior bioelectrocatalytic performance in MFCs and dye *** on the findings,a mechanism for the porous structure-controlled EAB formation and bioelectrocatalytic performance was *** work may provide helpful guidance and insights for designing microfiber-based electrodes for microbial fuel cells.

关键词： Electrospun mat Porous structure Bioelectrocatalysis Microbial fuel cells Polypyrrole

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Raman investigation of hydration structure of iodide and iodate

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Chinese Physics B 2021年第4期30卷 226-230页

作者： Zhe Liu Hong-Liang Zhao Hong-Zhi Lang Ying Wang Zhan-Long Li Zhi-Wei Men Sheng-Han Wang Cheng-Lin Sun Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin UniversityChangchun 130012China Coherent Light and Atomic and Molecular Spectroscopy Laboratory College of PhysicsJilin UniversityChangchun 130012China College of Aviation Foundation Aviation University of Air ForceChangchun 130000China

In the troposphere,the destruction of ozone and the formation of new particles are closely related to the iodine content,which mainly comes from iodide(I^(-)) and iodate(IO_(3)^(-)) in the ***,understanding the interactions between I^(-),IO_(3)^(-)and water molecules plays a certain role in alleviating the destruction of the ozone *** spectroscopy is commonly used to obtain the information of the interaction between I^(-),IO_(3)^(-)and water molecules quickly and ***,the effect of I^(-)and IO_(3)^(-)on the change in Raman band characteristics of water is investigated to reflect the associated intermolecular interactions *** the addition of the two ions,the Raman band corresponding to OH stretching vibration moves towards the high wavenumber,indicating the formation of hydration *** narrowing of the Raman band from OH stretching vibration under weak hydrogen bond agrees well with the hydrogen bond variation,while the abnormal broadening of the Raman band from OH stretching vibration under strong hydrogen bond indicates the formation of H-down *** the increase of ions concentration,the frequency shift of the Raman band from OH stretching vibration under both weak and strong hydrogen bonds becomes more ***,the frequency shift of I^(-)is more obvious than that of IO_(3)^(-),which indicates that I^(-)is more likely to form the hydration structure with water than IO_(3)^(-).These results contribute to analyzing the different interactions between I^(-)-water and IO_(3)^(-)-water,then helping to prevent ozone depletion.

关键词： Raman spectroscopy hydrogen bond hydration structure

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Fatigue Life Extension of Laser Shock Peened 7050 Aluminum Alloy Manufactured Fillet Structures 9

Fatigue Life Extension of Laser Shock Peened 7050 Aluminum A...

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9th International Conference on Surface Engineering, ICSE 2024

作者： Shuai, Shixiang Jiang, Angran Che, Zhigang Lei, Fan Sun, Rujian Co. Ltd. Chengdu610091 China Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology Institute Beijing100024 China

Laser shock peening (LSP) represents an advanced manufacturing method for surface strain strengthening and anti-fatigue production. In this study, laser shock peening (LSP) was employed to treat fillet structures made from 7050 aluminium alloy. Residual stress distribution and high cycle fatigue performance were investigated by numerical simulation and experiment, respectively. Further, fatigue life extension was verified with mathematical statistics methods. Results show that by utilizing the following LSP parameters: pulse energy of 25 J, spot size of Φ4.5 mm, overlapping rate of 50%, and peening twice, the average compressive residual stress on the fillet structure surface reached 218.3 MPa, the maximum residual stress in the depth direction located at a depth of 0.9 mm, and the thickness of residual stress affecting layer was 1.6 mm. Besides, the high cycle fatigue life significantly improved after LSP. The mean high-cycle fatigue life of the LSP-treated side was 160,626 cycles, in comparison to 58,606 cycles for the BM side. Furthermore, the t-test method of paired comparative experiments demonstrated that the high-cycle fatigue life of the LSP-treated side was 2.18 to 3.36 times higher than that of the BM side at the 95% confidence level. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Aluminum alloys

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Interfacial Si-O Coordination for Inhibiting the Graphite Phase Enables Superior Sic/Nb Heterostructure Joining by Auni

SSRN

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SSRN 2024年

作者： Li, Peixin Yan, Yaotian Zhang, Zilong Wang, Yaoxuan Zhang, Jingkang Qiao, Liang Cao, Jian Qi, Junlei State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China Key Laboratory of Materials Design and Quantum Simulation College of Science Changchun University Changchun130022 China

The reaction between SiC and Ni base brazing alloy is extremely intense, where the brittle Ni-Si compound and accompanied dissociate graphite phase as the interfacial reaction product in the joint damage the mechanical properties. In this study, the design of "graphite-controlled" heterogeneous integration component structure on SiC surface is developed to weaken the intense reaction of Ni and SiC. The high-quality surface Si-O coordination was successfully achieved by plasma enhanced chemical vapor deposition (PECVD) method at relatively low temperature on SiC, which increases the Si bond strength due to that the higher binding energy of Si-O (451 KJ/mol) than that of Si-C (347 KJ/mol). SiO2 films enhance the mechanical properties of the joint through macro-weak side interface interlocking and micro-stress mismatch regulation. The shear strength of SiC/Nb heterostructure joints by AuNi alloy was increased by 44%, which paves an inspiring way for boosting heterogeneous integration of SiC ceramic components. © 2024, The Authors. All rights reserved.

关键词： Binary alloys

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Biodiversity conservation and ecological restoration of vulnerable ecosystems in the Anthropocene

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Journal of Plant Ecology 2024年第5期17卷 1-4页

作者： Zhonghua Ning Tian Xie Xinxin Wang Zhenchang Zhu Cong Chen Baoshan Cui Key Laboratory of Ecological Protection in the Yellow River Basin of National Forestry and Grassland Administration School of Ecology and Nature ConservationBeijing Forestry UniversityBeijing 100083China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing 100875China Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering National Observations and Research Station for Wetland Ecosystems of the Yangtze EstuarySchool of Life ScienceFudan UniversityShanghai 200433China School of Ecology Environment and ResourcesGuangdong University of TechnologyGuangzhou 510006China Research and Development Center for Watershed Environmental Eco-engineering Advanced Institute of Natural SciencesBeijing Normal UniversityZhuhai 519087China

This editorial summarizes the contributions to the Special Issue Biodiversity conservation and ecological restoration of vulnerable ecosystems in the Anthropocene',established under the Journal of Plant Ecology.

关键词： Biodiversity ecosystems restoration

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EPIMR:Prediction of Enhancer-Promoter Interactions by Multi-Scale ResNet on Image Representation

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Big Data Mining and Analytics 2024年第3期7卷 668-681页

作者： Qiaozhen Meng Yinuo Lyu Xiaoqing Peng Junhai Xu Jijun Tang Fei Guo School of Computer Science and Technology College of Intelligence and ComputingTianjin UniversityTianjin 300350China Aeronautical Information Service Center of the Civil Aviation Administration of China(AISC.ATMB.CAAC) Beijing 100015China Center for Medical Genetics&Hunan Key Laboratory of Medical Genetics School of Life SciencesCentral South UniversityChangsha 410038China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518000China School of Computer Science and Engineering Central South UniversityChangsha 410083China

Prediction of enhancer-promoter interactions(EPIs)is key to regulating gene expression and diagnosing genetic *** to limited resolution,biological experiments perform not as well as expected while precisely identifying specific interactions,giving rise to computational biology *** EPI predictors have been developed,but their prediction accuracy still needs to be ***,we design a new model named EPIMR to identify enhancer-promoter ***,Hilbert Curve is utilized to represent sequences to images to preserve the position and spatial ***,a multi-scale residual neural network(ResNet)is used to learn the distinguishing features of different abstraction ***,matching heuristics are adopted to concatenate the learned features of enhancers and promoters,which pays attention to their potential interaction *** results on six cell lines indicate that EPIMR performs better than existing methods,with higher area under the precision-recall curve(AUPR)and area under the receiver operating characteristic(AUROC)results on benchmark and under-sampling ***,our model is pre-trained on all cell lines,which improves not only the transferability of cross-cell line prediction,but also cell line-specific prediction *** conclusion,our method serves as a valuable technical tool for predicting enhancer-promoter interactions,contributing to the understanding of gene transcription *** code and results are available at https://***/guofei-tju/EPIMR.

关键词： enhancer-promoter interactions Hilbert Curve multi-scale residual neural network(ResNet)

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Mechanism and data based modelling method of photovoltaic energy storage and transmission system 9

Mechanism and data based modelling method of photovoltaic en...

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9th International Symposium on Advances in Electrical, Electronics, and Computer Engineering, ISAEECE 2024

作者： Gu, Huaiguang Kou, Longze Gao, Yuqin Liu, Dong Liu, Dan Li, Linzhuo State Grid Smart Grid Research Institute Co. Ltd. Changping District Beijing102209 China State Key Laboratory of Advanced Power Transmission Technology Changping District Beijing102209 China Beijing Key Laboratory of DC Grid Technology and Simulation Changping District Beijing102209 China State Grid Hubei Electric Power Research Institute Hubei Wuhan430077 China North China Electric Power University Hebei Baoding071000 China

ISBN: (纸本)9781510683303

The power system model with power electronic equipment is usually a mechanism model, which needs to solve large-scale nonlinear differential algebraic equations. The solution process requires a large number of iterations, with a large amount of calculation. To address these issues in the mechanism model, a mechanism and data based modelling method based on artificial intelligence algorithms is proposed. This method replaces some complex mechanism models with data models, which can reduce the problem of requiring a large number of iterations for power electronic devices in the mechanism model. By controlling the sampling time, the accuracy control of the mechanism and data based model is achieved, finally, the mechanism and data based model of photovoltaic energy storage and transmission system is completed, improving the running speed. © 2024 SPIE ·

关键词： Data modeling Solar energy Modeling Photovoltaics Batteries Solar cells Electronic components

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Test and Analysis of Glare Effect of Incoherent Directional Beam

Test and Analysis of Glare Effect of Incoherent Directional ...

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2022 Applied Optics and Photonics China: Biomedical Optics, AOPC 2022

作者： Feng, Yun-Song Fan, Bin Xia, Jian-Ming Jin, Wei Wang, Jin Chen, You-Cai Key Laboratory of Infrared and Low Temperature Plasma of Anhui Province National University of Defense Technology Hefei230037 China Advanced Laser Technology Laboratory of Anhui Province Hefei230037 China State Key Laboratory of Pulsed Power Laser Technology National University of Defense Technology Hefei230037 China Army Equipment Division Aviation Military Representative Office Resident in Shanghai Shanghai200233 China The 38th Research Institute of China Electronics Technology Group Corporation Hefei230088 China

ISBN: (纸本)9781510662346

Usually, when there is no glare light source, the light reflected by the target is received by the human eye and then imaged on its retina. The observer can clearly see the target object, and the human eye can correctly judge the movement speed and direction of the target. However, when the glare light source exists, the glare light is scattered to form a light curtain, which is superimposed on the retina. If the scattered light is not too strong, it will not cause discomfort to the human eye, but it reduces the observer's perception of the target object. The visual sense reduces the contrast between the target object and the environment in the human eye, and reduces the human visual response speed. Incoherent directional beam glare interferes with the visual function of normal eyes through instantaneous strong light stimulation, causing temporary loss or decline of visual function, as well as image retention, discomfort, and avoidance responses such as blinking, closing eyes, and turning heads. Based on the mechanism of glare effect, the influencing factors of glare were analyzed, and the influence of incoherent directional beams on human vision was studied from the aspects of light source brightness, irradiation time, flicker frequency, etc. The research results provide data support for the design and use of incoherent glare weapons, and lay the foundation for the application of incoherent directional beam glare weapons in public security fields such as border defense and denial, maritime expulsion, and anti-terrorism and stability maintenance. © 2023 SPIE.

关键词： Light sources

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Long-time evolution of charged grains in plasma under harmonic external force and after being withdrawn

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Chinese Physics B 2022年第2期31卷 460-464页

作者： Miao Guan Zhi-Dong Chen Meng-Die Li Zhong-Mao Liu You-Mei Wang Ming-Yang Yu Department of Physics School of ScienceHangzhou Dianzi UniversityHangzhou 310016China College of Engineering Physics CAMDTShenzhen Key Laboratory of Ultraintense Laser and Advanced Material TechnologyShenzhen Technology UniversityShenzhen 518118China Institute for Fusion Theory and Simulation Zhejiang UniversityHangzhou 310007China Theoretical Physics I Ruhr UniversityBochum D-44780Germany

Evolution of the charged grains in a two-dimensional dusty plasma under a spatially harmonic external force,in particular,their long-time behaviors after the force has been withdrawn,is studied by using molecular dynamics *** an external force and a grain–grain interaction force,initially homogeneously distributed grains can reach a quasistationary state in the form of a disk *** the external force is withdrawn,the disk moves initially with its size and shape nearly unchanged until it rapidly stops moving,and eventually the disk grain rotates like a *** time needed to reach the final state increases with the strength of the initial external force increasing.

关键词： dusty plasma external force long-time behavior molecular dynamics(MD)simulation

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