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9th China International Conference on High-Performance Ceramics, CICC 2015

作者： Xu, Minghan Song, Jieguang Wang, Ruihua Li, Shibin Wang, Ning Yu, Siyuan Yan, Hanxing Xia, Tingting Chen, Fei Engineering and Technology Research Center for Materials Surface Remanufacturing of Jiangxi Province School of Mechanical and Materials Engineering Jiujiang University Jiujiang332005 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783035710656

Yttrium aluminum garnet (YAG) with a chemical composition of Y3Al5O12 is an important advanced structural and functional material due to some excellent properties. The porous YAG ceramics were prepared via vacuum sintering technology, the effect of sintering aids on the properties of porous YAG ceramics were investigated in this paper. Through an analysis and discussion, the conclusions are that the porosity increases with the increasing sintering temperature from 1300°C to 1500°C, the pore is moved to the surface of sample, which forms the open pore to make the porosity increase, the more and bigger sintering neck is increased. Porous YAG ceramics are sintered at 1500°C, the regular outside shapes of porous YAG ceramic are kept using CaO and MgO as sintering aids, the outside shape of porous YAG ceramic is wrecked using Al2O3 as sintering aids, which shows the over fired phenomenon. © 2016 Trans Tech Publications, Switzerland.

关键词： Yttrium aluminum garnet

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Fabrication of translucent boron nitride dispersed polycrystalline silicon nitride ceramics

Fabrication of translucent boron nitride dispersed polycryst...

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International Symposium on Multifunctional Ceramic Materials Based on Nanotechnology, ISMCN 2010

作者： Joshi, B. Fu, Z. Niihara, K. Lee, S.W. Department of Metallurgy and Material Engineering Sunmoon University Korea Republic of State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology China Nagaoka University of Technology Nagaoka Japan Department of Environment Engineering Sunmoon University Asan Korea Republic of

Optical transparency was achieved at infrared region and overall translucent silicon nitride was fabricated using hot press sintering (HPS). The increase in h-BN content decreased the optical transparency. Microstructral observations shows that the optical, mechanical and tribological properties of BN dispersed polycrystalline Si3N4 ceramics were affected by the density, α:β-phase ratio and content of h-BN in sintered ceramics. The hot pressed samples were prepared from the mixture of α-Si3N4, AlN, MgO and h-BN at 1850°C. The composite contained from 0.25 to 2 mass % BN powder with sintering aids (9% AlN + 3% MgO). Maximum transmittance of 57% was achieved for 0.25 mass % BN doped Si3N4 ceramics. Fracture toughness was increased and wear volume and friction coefficient were decreased with increase in BN content.

关键词： III-V semiconductors

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An Accurate Equivalent Circuit Model for Non-Intrusive electromagnetic Energy Harvester

An Accurate Equivalent Circuit Model for Non-Intrusive Elect...

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Power Electronics and Application Symposium (PEAS), IEEE International

作者： Liwen Hou Han Peng State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

High-frequency power electronic switching devices generate significant high-frequency magnetic fields in their surrounding space. High-frequency magnetic field energy harvesting devices offer higher output power density, allowing for smaller energy harvesting device volumes and portable installations, compared with grid frequency energy harvesters. Currently, research on the energy harvesting of high-frequency magnetic fields is relatively limited. The establishment of an accurate equivalent circuit model for high-frequency magnetic energy harvesters remains incomplete. Existing transformer models and inductance models are not entirely applicable. Calculating the AC coil resistance caused by skin effect and proximity effect, as well as the additional losses generated by eddy currents within the magnetic core, parasitic capacitance, and AC inductance parameters are highly related with the actual structure and design of the harvester. This paper designs a rectangular magnetic core structure and analyzes the equivalent circuit for high-frequency energy harvesting. Experimental parameter extraction is conducted to validate the correctness of the equivalent circuit model, demonstrating its effectiveness and accuracy.

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Ablation characteristics of hybrid target materials for laser triggered vacuum switches

Ablation characteristics of hybrid target materials for lase...

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International Conference on Mechanical, Electric and Industrial engineering, MEIE 2018

作者： Hui, Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei430074 China Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy Hubei University of Technology Wuhan430068 China Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China

The key difference of laser triggered vacuum switch (LTVS) and electrical triggered vacuum switch (ETVS) is the different triggered way, because the initial plasmas were generated by laser irradiation target material of LTVS, which generates different impact on the triggered characteristics of LTVS with different target materials. There are three laser wavelength (1064nm, 532nm and 266nm) which are tested the triggered characteristics of target materials, with decreased conduction time delay under the condition of increasing laser energy. © Published under licence by IOP Publishing Ltd.

关键词： Hybrid materials

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Time on the performance of ceramic ball grinding media prepared from refractory waste

Time on the performance of ceramic ball grinding media prepa...

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作者： Zhong, L.Y. Wu, B.L. Zhang, L.M. Song, J.G. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Key Lab. of Nonferrous Materials and New Processing Technology Guilin University of Technology Ministry of Education Guilin Guangxi 541004 China Department of Materials and Chemical Engineering Guilin University of Technology Guilin 541004 China

Aluminosilicate refractory waste was used to prepare high performance ceramic ball grinding media with 75% Al2O3. The influence of milling time on the particle size of raw materials, the sintering temperature, and performance of ceramic balls were studied. Results show that with increasing milling time the particle size of the raw materials decreased, resulting in a decrease of ceramic ball sintering temperature and an increase in wear resistance and volume density. The wear rate and volume density of balls prepared by milling the materials for 72 h were 0.01886 %/h and 3.374 g/cm 3, respectively.

关键词： Grinding (machining)

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Design and Experimental Verification of DC-DC Autotransformer Prototype

Design and Experimental Verification of DC-DC Autotransforme...

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IEEE Power and Energy Society General Meeting

作者： Mengbo Li Meng Zhou Wenping Zuo Weixing Lin Jinyu Wen Cheng Luo State Key Lab of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Northern Indiana Public Service Company

ISBN: (纸本)9781538622131;9781538622124

It is a necessity to use DC-DC transformers when interconnecting two DC systems with different voltages levels. This article designs the prototype of bidirectional DC-DC autotransformer (DC AUTO) and voltage step-up unidirectional DC AUTO (UUDAT). The article firstly illustrates the electrical primary system in experimental prototype, then studies its control strategy and the corresponding control system framework. Finally, the article analyses the operating characteristics of the prototype. The experimental results manifest that the bidirectional DC-AUTO transformer and the UUDAT are all capable of transmitting DC power as required. Taking interconnecting two DC systems with voltage level of 375V and 750V as instance, the capacity of the converter using DC AUTO technology will only be 50% of the capacity using conventional DC/AC/DC technology. The theoretical deductions and the experimental results have all demonstrated that DC AUTO technology will not only ensure low building cost but also lead to low transmission loss.

关键词： Power conversion Prototypes HVDC transmission Voltage control Topology electromagnetics

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On designing QoS for congestion control service using neural network predictive techniques

On designing QoS for congestion control service using neural...

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IEEE International Conference on Granular Computing

作者： Xiong, N. Yang, Y. He, Jing He, Yanxiang IEEE Japan School of Information Science Japan Advanced Institute of Science and Technology Japan Department of Computer Science Utah State University Logan UT 84322-4205 United States State Key Lab. of Software Engineering Computer School Wuhan University China

ISBN: (纸本)142440133X

With the ever-increasing data transmission applications recently, considerable efforts have been focused on the design of congestion control scheme for data transmission service to guarantee the quality of service (QoS). The main difficulty in designing an efficient congestion controller for data transmission service stems from the heterogeneous receivers, especially those with large propagation delays in data transfer, which also mean the feedbacks arriving at the source are somewhat outdated and can be harmful to the control actions. This usually leads to a mismatch between the network resources and the amount of admitted traffic. To attack this problem, the present paper describes a novel congestion control scheme that is based on a Back Propagation (BP) neural network technique. We consider a general computer communication model with multiple sources and one destination node. This network-assisted property is different from the existed control scheme in that the data source can predict the dynamic of buffer occupancy of the bottleneck node for which the back control packets experience very long propagation delay and probably cause irresponsiveness of a. data flow. This active scheme makes the control more responsive to the network status. Thus the rate adaptation can be in a timely manner for the sender to react to network congestion quickly. We analyze the theoretical aspects of the proposed algorithm, show how the control mechanism can be used to design a controller to support the data transmission based on feedback of explicit rates' (ER's), and verify this agreement by the simulations. Simulation results show the efficiency of our scheme in terms of quickly response and excellent predictive accuracy.

关键词： neural network applications neural networks traffic control (communication) interconnection networks transportation networks

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Effect of Al and Si additions on the synthesis of spark plasma sintered Zr2Al4C5 ceramic 9th

Effect of Al and Si additions on the synthesis of spark plas...

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9th China International Conference on High-Performance Ceramics, CICC 2015

作者： Guo, Qilong Pei, Junjun Gan, Jizhong Li, Junguo Zhang, Lianmeng Key Laboratory of New Building Materials and Building Energy Efficiency of Gansu Province School of Civil Engineering Northwest University for Nationalities Lanzhou730124 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783035710656

The Zr2Al4C5 ceramic was successfully fabricated by the spark plasma sintering at 1800°C for 10 min under uniaxial 20 MPa pressure in vacuum using a mixed raw materials of Zr, Al, Si and graphite powders. The X-ray diffraction analysis results showed that the unexpected Zr2Al3C5 phase rather than target compound Zr2Al4C5 formed in the sintered samples. An initial Zr: Al: C molar ratio of 2:4.2:4.8 for raw powders, and even 55 mol.% excess Al, did not lead to a phase transformation from Zr2Al3C5 to Zr2Al4C5. When 4 wt.% Si was induced in the starting powders, the major phase became Zr2Al4C5 and no obvious Zr2Al3C5 was detected in the sintered samples with an initial Zr: Al: C molar ratio of 2: 6.2: 4.8 (55 mol.% excess Al). The introduction of Si could suppress and even remove additional ZrC, and Si atoms would exclusively occupy the site of Al to make Zr2Al4C5 become a stable solid solution. The scanning electron microscopy observation showed that the as-synthesized Zr2Al4C5 grains had elongated, rod-like and/or plate-like shapes. The mechanical properties of the sintered Zr2Al4C5 ceramic were also investigated, and it showed a hardness of 11.06±0.34 GPa and a fracture toughness of 4.6 ± 0.4 MPa m1/2. © 2016 Trans Tech Publications, Switzerland.

关键词： Scanning electron microscopy

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Simultaneous transmission of high-speed point-to-point data and double broadcast services in a WDM-PON system with source-free ONUs

Simultaneous transmission of high-speed point-to-point data ...

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Optical Transmission, Switching, and Subsystems VI

作者： Chang, Qingjiang Huang, Mingfang Su, Yikai State Key Lab. of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Electrical and Computer Engineering Georgia Institute of Technology GA 30332 United States

We propose that double broadcast services can be overlaid over high-speed point-to-point downlink data in a WDM-PON with source-free optical network units (ONUs). In the optical line terminal (OLT), a set of single-drive MachZehnder modulators (MZMs) are driven by downlink point-to-point data to generate a differential phase-shift keying (DPSK) format. The downlink DPSK signals from different wavelengths are multiplexed and then fed to a following dual-parallel MZM (DPMZM) as a double broadcast services transmitter. The broadcast service-l is an optical carrier suppression (OCS) format, while the broadcast service-2 is an inverse return-to-zero (IRZ) forma. After the transmission, at each ONU, the optical signals are separated by an optical filter. The filtered OCS signal is detected to retrieve the broadcast service-1. The DPSK/IRZ signals are split into three parts, one part is detected by an IRZ receiver to recover the broadcast service-2, the second part is detected by a DPSK receiver to retrieve the downlink data and the third part is re-modulated by the upstream amplitude shift keying (ASK). We also perform an experiment to verify the feasibility of the proposed scheme, where the power penalties of less than 1.5 dB are obtained after 25-km transmission with 1.25-Gb/s data rate. © 2008 SPIE.

关键词： Digital storage

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Regulation of Surface Terminal Hydroxyl Coverage of FeOCl Catalyst via Crystal Facet Protection for Enhanced H2O2 Activation

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Environmental Science and technology 2025年 2025 May 21页

作者： Chen, Shuxun Liang, Jianxing Li, Jingdong Bao, Chenyu Chen, Yushan Yue, Dongting Fan, Maohong Li, Kan Jia, Jinping School of Environmental Science and Engineering Shanghai Jiao Tong University NO. 800 Dong Chuan Road Shanghai200240 China School of Chemistry and Chemical Engineering Shanghai Applied Radiation Institute State Key Lab. Advanced Special Steel Shanghai University NO. 99 Shangda Road Shanghai200444 China College of Engineering and Physical Sciences School of Energy Resources University of Wyoming College of Engineering LaramieWY82071 United States Georgia Institute of Technology AtlantaGA30332 United States

The unique Fe coordination environment in the FeOCl catalyst confers superior reducible electronic properties, rendering them attractive Fenton-like active sites. DFT calculations reveal that the U-shaped coordinated Fe sites formed with 50% terminal hydroxyl coverage exhibit the best H2O2 activation performance, which allows the adsorbed H2O2 to form a ·OH directly with much lower activation energy. Herein, a crystal facet protection strategy induced by rapid high-temperature annealing is developed to synthesize FeOCl with high exposure of Fe atoms while regulating the surface hydroxyl coverage. The dominant expression of the (021) facet resulted in an optimized surface terminal hydroxyl coverage of 58.3%, increasing the intrinsic activity of FeOCl by 4.3 times. The d-band center of FeOCl with optimized terminal hydroxyl coverage is closer to the Fermi level, thus exhibiting higher affinity for H2O2, and the increased amount of U-shaped coordinated Fe sites enables sufficient ·OH generation for enhanced decontamination performance. Since the terminal hydroxyl groups can be consumed by Ca2+ and Mg2+ through coprecipitation, preremoving the hardness of actual wastewater is indispensable in the application of the FeOCl/H2O2 system. Our finding provides a new way to improve the intrinsic activity of FeOCl catalyst, which is helpful for its application in other environmental remediations. © 2025 American Chemical Society.

关键词： Activation energy

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