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| 1 | Fractionally Nyquist Sample Spaced ARMA Blind Equalizer for Direct Signal Recovery in Passive Bistatic Radar显示文摘This paper proposes a modified signal processing structure based on the fractionally Nyquist sample spaced structure for passive bistatic radar.To recover the direct signal from the multipath clutter,an equalizer of the Auto regressive moving average(ARMA)type is proposed based on the fractionally Nyquist sample spaced constant modulus algorithm.Compared with the conventional Nyquist sample spaced equalizer,the equalizer of the fractionally Nyquist sample spaced ARMA structure is more effective in dealing with deep fading multipath channels with zeros near the unit circle.Computer simulations and real data tests indicate that the proposed approach outperforms the conventional processing structure in terms of both clutter residual and mean square error. | WANG Feng SHEN Wei JIANG Defu WEI Shuang | 2017 | Chinese Journal of Electronics2017，26，3： | 1 |
| 2 | Effect of Cryogenic and QPQ Compound Treatment on the Microstructures and Performance of High Speed Steel显示文摘China’s High-speed steel cutting tools hold a considerable share in the global market.However,the overproduction of low-end HSS tools causes serious resource waste and low efficiency,which has become one of the major problems in the tool industry in China.So a new Surface Modification technology is developed,which can make the low-end HSS tools into the high-end ones.On the analysis of the mechanism of cryogenic and quenching-polish-quenching(QPQ),the cryogenic and QPQ compound treatment are studied by using φ8 HSS(M2) drills.The nitriding layer and the base of the drill bit are Studied and analyzed,and the mechanism of compound treatment is discussed by the technological parameters adjustment and the combination test of cryogenic,nitrogen,tempering procedures,and several analysis methods such as the optics metallographic microscope,the scanning electronic microscope (SEM),X-ray diffraction and micro hardness.The cutting test is done on the drills by cryogenic treatment,QPQ treatment and cryogenic and QPQ compound treatment separately.The results indicates that the cutting life of HSS (M2) drill can be increased dramatically by cryogenic and QPQ compound treatment. | LUO Defu LI Shen | 2012 | Chinese Journal of Mechanical Engineering2012，25，1： | 0 |
| 3 | Sedimentary Records and Environmental Analysis of the Ximencuo Lake in Northeast Qinghai-Tibet Plateau in the Past 1,700 Years显示文摘Lake sediment is the recorder of historical climate fluctuation and basin environment change. This study collected the Ximencuo Lake sediment in source area of the Yellow River, analyzed organic matters and geochemical elements of the core, obtained nearly environment changes of the past 1,720 years. The results showed the environment evolution process of the 47-cm columnar core can be divided into four stages: below 32 cm(before 900 A.D.), corresponding to the cool and wet climate; 32–20 cm(900 A.D–1300 A.D.), corresponding to the warming temperature and decreasing precipitation; between 20–3.5 cm(1300–1900 A.D.), the stage is more consistent with the Little Ice Age, and precipitation gradually reduced; 3.5–0 cm(since 1900 A.D.), this is the twentieth Century warming period with increasing temperature and reduced precipitation. Phosphorus content increased rapidly in the last 20 years, reflecting the continuously increasing human interventions, but before this period, the P content was low and stable, indicating the natural background of regional phosphorus content. | SHEN Defu LI Shijie JIANG Yongjian | 2016 | Journal of Landscape Research2016，8，1： | 0 |
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