Yunhua Zhang

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Significant progress has been made in isolating novel alkaline β-mannanases, however, there is a paucity of information concerning the structural basis for alkaline tolerance displayed by these β-mannanases. We report the catalytic domain structure of an industrially important β-mannanase from the alkaliphilic Bacillus sp. N16-5 (BSP165 MAN) at a resolution(More)
In surface mapping synthetic aperture radar (SAR), homogeneous media is usually assumed, through which transmitted and reflected signals propagate. In ground penetrating SAR (GPEN SAR) system designed for detecting buried targets, we must take account of multiple media condition. It brings several factors which affect the quality of SAR image, such as(More)
Sweet potato (Ipomoea batatas L. cv. Lizixiang) is a nutritious arable crop with a low drought tolerance during growth and maturation. The Arabidopsis HOMEODOMAIN GLABROUS 11 (HDG11) gene can increase drought tolerance in tobacco and tall fescue plants. To determine the effect of HDG11 in the sweet potato, transgenic plants that expressed the HDG11 gene(More)
In this paper, a modified correlation coefficient algorithm is proposed to accomplish image-registration for repeat-pass SAR interferometry. This algorithm utilizes a new definition of correlation coefficient to improve the calculation accuracy of offset between two images. Our simulation shows that Doppler centroid has a significant influence on the(More)
A compact V-band active power detector using Infineon 0.35 &#x03BC;m SiGe HBT process (f<sub>T</sub>/f<sub>max</sub> =170/250 GHz) is described. The total chip area is only 0.35&#x00D7;0.8 mm<sup>2</sup> including all pads. This design exhibits a dynamic range larger than 20 dB over the frequency range from 55 GHz to 67 GHz. It also offers a simple and(More)
To solve the problems of free-riding and tragedy of the common problems in peer-to-peer (P2P) networks, we firstly analyze the reason of the free-riding problem. Secondly, we investigate three typical incentive mechanisms and discuss their advantages and disadvantages individually. Finally, we introduce an incentive mechanism based on the Hybrid war model(More)
Neuritin (also known as candidate plasticity gene 15 (cpg15)) is a neurotrophic factor that was recently discovered in a screen aimed at identifying genes involved in activity-dependent synaptic plasticity. Neuritin plays multiple roles in both neural development (Chen et al. Zhonghua Yan Ke Za Zhi 46:978–983 2010; Corriveau et al. J Neurosci 19:7999-8008(More)