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EFFECT OF LOW-FREQUENCY ELECTROMAGNETIC FIELD ON THE AS-CASTING MICROSTRUCTURES AND MECHANICAL PROPERTIES OF HDC 2024 ALUMINUM ALLOY F.Qu1,Y.B.Zuo1,Z.H.Zhao1,J.Z.Cui1,Q.F.Zhu1 (1.Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004, China) Abstract:The influences of the low frequency electromagnetic field on the horizontal......
Synthetic Effects of Frequency and Duty Ratio on Growth Characteristics, Energy Consumption and Corrosion Properties of Microarc Oxidized Coating Formed on Ti6Al4VTong Zhou1,Zhen-Bo Qin1,Qin Luo1,Qi... effects of frequency and duty ratio on growth characteristics and corrosion properties of coating on Ti6 Al4 V fabricated by microarc oxidation are investigated comprehensively. Under the condition......
, China) Abstract: Based on harmonic current in the grid, the frequency domain was analyzed after explaining the basic working principle of ip-iq harmonic detection, and a novel detection filter... can be optimized; accuracy and dynamic response are improved significantly, and also this proposed method is accurate and effective. Key words: harmonics; reactive power; frequency domain; low-pass......
Characteristics of permittivity and permeability spectra in range of 2-18 GHz microwave frequency for La1-xSrxMn1-yByO3 (B=Fe, Co, Ni) ZHOU Ke-sheng(周克省)1, WANG Da(王 达)1, 2, HUANG Ke-long(黄可龙)3... at site B were prepared by sol-gel as an microwave absorption material and their permittivity and permeability spectra were measured by microwave vector network analyzer in the frequency range of 2-18 GHz......
DOI: 10.11817/j.issn.1672-7207.2015.07.018 基于窄带电力噪声干扰的OFDM分组检测算法 谷志茹,刘宏立,陈炳权,谭周文 (湖南大学 电气与信息工程学院,湖南 长沙,410082) 摘要:针对电力噪声和正交频分复用(orthogonal frequency division multiplexing,OFDM)信号的特点,为提高检测的准确度同时减少数据冗余... the characteristics of power line noise and orthogonal frequency division multiplexing (OFDM) signal, a principal component analysis (PCA) was proposed for improving the accuracy of detection......
, Northeastern University, Shenyang 110004, China Received 23 October 2009; accepted 6 September 2010 Abstract: The working principle of LFEC(Low frequency electromagnetic casting) process developed in Northeastern University, China was introduced and the metallurgical results of LFEC were discussed according to the casting practices. The low frequency field around the mold produces Lorenz force......
Frequency Up-conversion Luminescence Properties and Mechanism of Tm3+ /Er3+/Yb3+ Co-doped Oxyfluorogermanate Glasses胡曰博1,2,3,周大利11. School of Materials Science and Engineering,Sichuan University2. School of Materials Science and Engineering,Kunming University of Science and Technology3. Materials Engineering Research Institute,Kunming Metallurgy College摘 要:
Processing of Materials of Ministry of Education,Northeastern University, Shenyang 110004, China Received 23 September 2009; accepted 30 January 2010 Abstract: The effects of low frequency... are improved. Key words: low frequency electromagnetic field; ultrasonic field; Mg alloy; DC casting 1 Introduction Grain refinement is an effective way to improve the workability and strengthening......
the glass transition temperature (Tg), loss factor (tanδ) and activation energy (Ea) by using multiplexing frequency. The results show that the Ea at glassy relaxation process of modified system is about 70-80 kJ/mol higher than that of unmodified system, and the high modulus and good thermal properties are still maintained. Key words: epoxy resin; hyperbranched polymer; multiplexing frequency......
Effects of Current Frequency on the Microstructure and Wear Resistance of Ceramic Coatings Embedded with SiC Nano-particles Produced by Micro-arc Oxidation on AZ91D Magnesium AlloyYue Yang and Hua Wu... wear resistance of the ceramic coating fabricated by micro-arc oxidation (MAO) on AZ91D magnesium alloy,ceramic coatings embedded with SiC nano-particles at different current frequency (500 Hz,700 Hz......
