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Articles by Jie Zhu
Total Records ( 5 ) for Jie Zhu
  Lianjun Liu , Bin Liu , Lihui Dong , Jie Zhu , Haiqin Wan , Keqin Sun , Bin Zhao , Haiyang Zhu , Lin Dong and Yi Chen
  In situ FT-IR was employed to investigate CO or/and NO interaction with CuO supported on Ce0.67Zr0.33O2 (hereafter denoted as CZ) catalysts. The physicochemical properties of CuO–CZ were also studied by combination of XRD, TPR and NO + CO activity tests. The results indicated that the dispersed CuO species were the main active components for this reaction. The catalysts showed different activities and selectivities at low and high temperatures, which should be resulted from the reduction of dispersed copper oxide species. This reaction went through different mechanisms at low and high temperatures due to the change of active species. FT-IR results suggested: (1) CO was activated by oxygen originating from CZ support, which led to surface carbonates formation, and partial dispersed CuO was reduced to Cu+ species above 150 °C; (2) NO interacted with the dispersed CuO and formed several types of nitrite/nitrate species, whereas crystalline CuO made little contribution to the formation of new NO adsorbates; (3) NO was preferentially adsorbed on CuO–CZ catalysts compared with CO in the reactants mixture. These adsorbed nitrite/nitrate species exhibited different thermal stability and reacted with CO at 250 °C. As a result, a possible mechanism was tentatively proposed to approach NO reduction by CO over CuO–CZ catalyst.
  Juan Li , Rang-Ding Wang and Jie Zhu
  A method to authenticate the integrity of audio aggregation is proposed in this study. The vector-sharing scheme is used to fragile watermarking technology because it is very sensitive when recovering the secret. In this algorithm, the key sharing ideology is introduced into audio aggregation watermarking algorithm by separating the watermark in different audio works of the audio aggregation. When detected the original watermark can be recovered without original audio aggregation. The experimental results show that the proposed algorithm has strong vulnerability, good imperceptibility and can locate the audio work (s), which suffered attack in the audio aggregation.
  Jie Zhu , Rang-Ding Wang , Juan Li and Di-Qun Yan
  Steganography techniques can be used to embed secret information into audio signals. A Huffman coding section-based steganographic scheme for MPEG-2/4 Advanced Audio Coding (AAC) audio is proposed in this study. Based on the characteristics of Huffman coding section, the scheme hides secret information by modifying the sections of Huffman coding without affecting its normal process of encoding. Experimental results are given to show that the proposed scheme not only has a larger capacity, 15 bits per frame averagely but also does not change the statistical properties of the audio carrier which means having certain undetectability. In addition, the scheme does not affect the quality of audio carrier, having good imperceptibility.
  Dawei Ding , Jie Zhu and Xiaoshu Luo
  This paper focuses on the Hopf bifurcation analysis of some classes of nonlinear time-delay models, namely fluid flow models, for the Internet congestion control algorithm of TCP/AQM networks. Using tools from control and bifurcation theory, it is proved that there exists a critical value of communication delay for the stability of the network. When the delay passes through the critical value, the system loses its stability and a Hopf bifurcation occurs. Furthermore, the stability of the bifurcation and direction of the bifurcating periodic solutions are determined by applying the normal form theory and the center manifold theorem. Finally, some numerical examples are given to verify the theoretical analysis.
  Monica Antenos , Jie Zhu , Niti M. Jetly and Teresa K. Woodruff
  Of all ligands of the transforming growth factor β superfamily, inhibins and activins are a physiologically relevant pair that are functional antagonists of each other. Activin stimulates whereas inhibin blocks follicle-stimulating hormone biosynthesis and secretion from pituitary gonadotrope cells, and together, inhibin and activin control the pituitary gonadal axis essential for normal reproductive function. Sharing a similar β-subunit, the secretion of inhibin heterodimers (α/β) or activin homodimers (β/β) as mature bioactive ligands depends, in part, on the proteolytic processing of precursor proteins. A short loop regulatory pathway controlling precursor processing and dimer secretion was discovered. Activin stimulates endogenous inhibin α- and βB-subunit mRNA, protein, and proteolytic processing. Simultaneously, activin stimulated the proconvertase furin through a Smad2/3-dependent process. The data provide a mechanism where the regulation of furin and inhibin subunits cooperates in an important positive short feedback loop. This regulatory loop augments the secretion of bioactive mature activin B, as well as inhibin B dimers, necessary for local follicle-stimulating hormone β regulation.
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