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Search Results: 1 - 10 of 137417 matches for " ZHANG Yan-Fei "
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Dimethylammonium bis(4-methylmorpholin-4-ium) tetrachloridozincate
Yan-wei Zhang,Yan-fei Wang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811025049
Abstract: The title compound, (C2H8N)(C5H12NO)[ZnCl4], was synthesized by hydrothermal reaction of ZnCl2 with 4-methylmorpholine in a dimethylformamide solution. The asymmetric unit is composed of half a [ZnCl4]2 anion, half a 4-methylmorpholin-4-ium cation and half a dimethylammonium cation, all located on mirror planes parallel to ac. All the amine H atoms are involved in intermolecular N—H...Cl hydrogen bonds, building up an infinite chain parallel to the c axis.
Exploring Species Limits in Two Closely Related Chinese Oaks
Yan-Fei Zeng,Wan-Jin Liao,Rémy J. Petit,Da-Yong Zhang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0015529
Abstract: The species status of two closely related Chinese oaks, Quercus liaotungensis and Q. mongolica, has been called into question. The objective of this study was to investigate the species status and to estimate the degree of introgression between the two taxa using different approaches.
Mean first-passage time and stochastic resonance in an asymmetric bistable system driven by non-Gaussian noise
非高斯噪声驱动下非对称双稳系统的平均首次穿越时间与随机共振研究

Zhang Jing-Jing,Jin Yan-Fei,
张静静
,靳艳飞

物理学报 , 2011,
Abstract: In this paper, mean first-passage time (MFPT) and stochastic resonance (SR) are investigated in an asymmetric bistable system driven by multiplicative non-Gaussian noise and additive Gaussian white noise. Using the path integral approach and two-state theory, the expression of MFPT and the signal-to-noise ratio (SNR) are derived. The results show that the influences of the asymmetric coefficient on the MFPTs in two opposite directions are entirely different. SNR is a non-monotonic function of the additive noise intensity and asymmetric coefficient, therefore, an SR is found in this system. Whereas SNR is a monotonic function of the multiplicative noise intensity and no SR appears. This demonstrates that the effect of the multiplicative noise intensity on SNR is different from that of the additive noise intensity in the system.
The Study of Imaging Algorithm of Distributed Satellites InSAR System
分布式卫星InSAR系统的成像算法研究

Zhang Qiu-ling,Wang Yan-fei,
张秋玲
,王岩飞

电子与信息学报 , 2006,
Abstract: Chirp Scaling (CS) imaging algorithm is derived and implemented in this paper, which is adapted to bistatic and squinted radar in distributed satellites Interferometric Synthetic Aperture Radar (InSAR) system. Considering the characteristic of baseline instability in this system, an effective method is proposed to eliminate the effect of baseline instability on SAR image and interferometric measure. The simulation results validate the property of phase preserving of bistatic and squinted CS algorithm and the effectiveness of compensated method of baseline instability.
Improving the Interferometric Phase Accuracy of Distributed Satellites InSAR System with Multibaseline Data Fusion
利用多基线数据融合提高分布式卫星InSAR系统的干涉相位精度

Zhang Qiu-ling,Wang Yan-fei,
张秋玲
,王岩飞

电子与信息学报 , 2006,
Abstract: Distributed satellites Interferometric Synthetic Aperture Radar (InSAR) can provide large baseline, by which the sensitivity to topography measure can be improved. But large baseline arises the difficulty in phase unwrapping procedures. Combined the characteristic of multibaseline of distributed satellites InSAR system, a method that utilizes the multibaseline data fusion is proposed to solve the problem of phase unwrapping brought by large baseline in this paper. Maximum likelihood (ML) method that is an effective two-baseline data fusion algorithm is adopted to estimate interferometric phase of distributed satellites InSAR system. The simulation results show that the phase unwrapping accuracy via multibaseline data fusion is higher than that of direct phase unwrapping of large baseline interferometric phase.
Study on the feasibility of using the MT method to map the depth of Curie interface
MT探测居里面深度的可行性研究

ZHANG Yan-fei,XU Yi-xian,
张艳飞

地球物理学进展 , 2009,
Abstract: Curie-surface is a temperature dependent interface in the earth where the iron-magnetic mineral is realized to be lost its ferromagnetism. Modern physical experiments indicate that the magnetic susceptibility of rocks will be increased by several tens to hundreds times when the temperature is just below the Curie point. The conventional methods used in mapping the depth of temperature approaching to the Curie point are the spectral analysis and equivalent layer model based on geomagnetic data. But both of them have some inherent limitations. In the present study the feasibility of using the MT method to map the depth of Curie-surface was numerically investigated on the 1D earth model. The results show that the thickness of the abnormal magnetic layer can not be determined accurately; however, the depth to the layer and its electrical and magnetic properties are well resolved. This study hence provides a potential application for the classical magnetotelluric method.
Diphenyl chlorothiophosphonate
Yan-Fei Zhang,Pei-Hua Zhao,Jun-Jie Liu,Gui-Zhe Zhao
Acta Crystallographica Section E , 2011, DOI: 10.1107/s160053681104030x
Abstract: The complete molecule of the title compound, C12H10ClO2PS, is generated by crystallographic mirror symmetry, with the P, S and Cl atoms lying on the mirror plane. The resulting PO2SCl tetrahedron is significantly distorted [O—P—O = 96.79 (9)°]. The crystal packing exhibits no directional interactions.
Effect of captopril on myocardial energy metabolism in chronic pressure overload rats
Yan-Fei Wang,Xue-Bin Cao,Ren Yue,Zhang Gang
老年心脏病学杂志(英文版) , 2010,
Abstract: Objective To investigate the effects of captopril on cardiac function and levels of energy-rich phosphates in pressure overload induced left ventricular hypertrophy rats. Methods One hundred and twenty SD rats were randomly divided into three groups: sham operation group (SH group, n = 40), coarctation of abdominal aorta group (CAA group, n = 40) and captopril treatment (1 mg/100 g per day) group (CAP group, n = 40). Left ventricular end-diastolic pressure (LVEDP), left ventricular mass index (LVMI), levels of energy-rich phosphates and morphological changes of the myocardial mitochondria were compared at the 6th and 8th week after operation. Results At 6th week, in CAA group, LVMI and LVEDP were increased and ± dp/dtmax was decreased, while ATP and ADP were decreased and AMP was increased (P < 0.01). These changes were much obvious at 8th week (P < 0.01). Compared with those of CAA group, the parameters of heart function and energy-rich phosphates (ATP, ADP, AMP, TAN) in CAP group were improved significantly (P < 0.01) at the 6th and 8th week. In CAP group, the parameters of heart function and energy-rich phosphates (ADP, AMP, TAN) were much better at 8th week than those at 6th week. The morphological change of mitochondria was less in CAP group than that in CAA group. Conclusion Captopril significantly improves myocardial energy metabolism in pressure overload rats and protects the function of myocardial mitochondria.
Digital Control for Dynamic Performance Enhancement of DC-DC Switching Converters
Yan-Fei Liu
Lecture Notes in Engineering and Computer Science , 2011,
Abstract:
Effect of Online Reviews on Consumer Purchase Behavior  [PDF]
Zan Mo, Yan-Fei Li, Peng Fan
Journal of Service Science and Management (JSSM) , 2015, DOI: 10.4236/jssm.2015.83043
Abstract: In order to understand the effect of online reviews on consumer purchase behavior, more than 400 Taobao shops’ online reviews are collected. Based on S-O-R model (Stimulus-Organism-Response Model), this paper studies the influence on consumer purchase behavior according to online reviews of experience goods from a new perspective of consumer learning. Using SPSS 19.0 software for data analysis and assumptions, statistical results show that the positive reviews, describing rating, picture reviews, appended reviews and cumulative reviews have an effect on consumer purchase behavior. The moderate reviews, negative reviews, logistics rating and service rating are not significant in the results. Finally, this paper puts forward suggestions and summary.
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