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Search Results: 1 - 10 of 28492 matches for " Xiaoyun Zhu "
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Electrodeposition of Ni-W Amorphous Alloy andNi-W-SiC Composite Deposits
Electrodeposition of Ni-W Amorphous Alloy and Ni-W-SiC Composite Deposits

Zhongcheng GUO,Xiaoyun ZHU,Dacheng ZHAI,Xianwan YANG,

材料科学技术学报 , 2000,
Abstract: Ni-W alloys and their composite deposits are electroplated on the metals when an appropriate complex agent is selected on the base of the theories of electrochemistry and complex chemistry, and the principle of induced codeposition. Effects of the bath composition, pH value, temperature and current density on the electrode position of Ni-W alloys and their composite deposits have been investigated, and the effect of heat treatment temperature on the hardness, structure and cohesive force of the amorphous Ni-W alloys and their composite deposits are also discussed. Results showed that the alloys containing more than 44 wt pet W content and the composite deposits containing 7.8 wt pet SiC content could be obtained by making use of the appropriate bath composition and plating conditions. Alloys and their composite deposits with over 44 wt pet W content show amorphous structure. The hardness of amorphous Ni-W alloys and their composite deposits increases obviously when heated, and can reach to 1350 HV and 1520 HV respectively for 46 wt pet W content. The cohesion on Cu, carbon steel and stainless steel is very good.
Embedding and Extracting Digital Watermark Based on DCT Algorithm  [PDF]
Haiming Li, Xiaoyun Guo
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.611026
Abstract: The principle of digital watermark is the method of adding digital watermark in the frequency domain. The digital watermark hides the watermark in digital media, such as image, voice, video, etc., so as to realize the functions of copyright protection, and identity recognition. DCT for Discrete Cosine Transform is used to transform the image pixel value and the frequency domain coefficient matrix to realize the embedding and extracting of the blind watermark in the paper. After success, the image is attacked by white noise and Gaussian low-pass filtering. The result shows that the watermark signal embedded based on the DCT algorithm is relatively robust, and can effectively resist some attack methods that use signal distortion to destroy the watermark, and has good robustness and imperceptibility.
Association between Serum Growth Hormone Levels and Nonalcoholic Fatty Liver Disease: A Cross-Sectional Study
Lei Xu, Chengfu Xu, Chaohui Yu, Min Miao, Xuequn Zhang, Zhongwei Zhu, Xiaoyun Ding, Youming Li
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0044136
Abstract: Growth hormone (GH) is an important regulator of metabolism and body composition. GH deficiency is associated with increased visceral body fat and other features of the metabolic syndrome. Here we performed a cross-sectional study to explore the association of GH levels with nonalcoholic fatty liver disease (NAFLD), which is considered to be the hepatic manifestation of the metabolic syndrome. A total of 1,667 subjects were diagnosed as NAFLD according the diagnostic criteria, and 5,479 subjects were defined as the controls. The subjects with NAFLD had significantly lower levels of serum GH than the controls. Those with low GH levels had a higher prevalence of NAFLD and the metabolic syndrome. A stepwise logistic regression analysis showed that GH levels were significantly associated with the risk factor for NAFLD (OR = 0.651, 95%CI = 0.574–0.738, P<0.001). Our results showed a significant association between lower serum GH levels and NAFLD.
Suppression of Jasmonic Acid-Dependent Defense in Cotton Plant by the Mealybug Phenacoccus solenopsis
Pengjun Zhang, Xiaoyun Zhu, Fang Huang, Yong Liu, Jinming Zhang, Yaobin Lu, Yongming Ruan
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0022378
Abstract: The solenopsis mealybug, Phenacoccus solenopsis, has been recently recognized as an aggressively invasive pest in China, and is now becoming a serious threat to the cotton industry in the country. Thus, it is necessary to investigate the molecular mechanisms employed by cotton for defending against P. solenopsis before the pest populations reach epidemic levels. Here, we examined the effects of exogenous jasmonic acid (JA), salicylic acid (SA), and herbivory treatments on feeding behavior and on development of female P. solenopsis. Further, we compared the volatile emissions of cotton plants upon JA, SA, and herbivory treatments, as well as the time-related changes in gossypol production and defense-related genes. Female adult P. solenopsis were repelled by leaves from JA-treated plant, but were not repelled by leaves from SA-treated plants. In contrast, females were attracted by leaves from plants pre-infested by P. solenopsis. The diverse feeding responses by P. solenopsis were due to the difference in volatile emission of plants from different treatments. Furthermore, we show that JA-treated plants slowed P. solenopsis development, but plants pre-infested by P. solenopsis accelerated its development. We also show that P. solenopsis feeding inhibited the JA-regulated gossypol production, and prevented the induction of JA-related genes. We conclude that P. solenopsis is able to prevent the activation of JA-dependent defenses associated with basal resistance to mealybugs.
Endpoint Visual Detection of Three Genetically Modified Rice Events by Loop-Mediated Isothermal Amplification
Xiaoyun Chen,Xiaofu Wang,Nuo Jin,Yu Zhou,Sainan Huang,Qingmei Miao,Qing Zhu,Junfeng Xu
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms131114421
Abstract: Genetically modified (GM) rice KMD1, TT51-1, and KF6 are three of the most well known transgenic Bt rice lines in China. A rapid and sensitive molecular assay for risk assessment of GM rice is needed. Polymerase chain reaction (PCR), currently the most common method for detecting genetically modified organisms, requires temperature cycling and relatively complex procedures. Here we developed a visual and rapid loop-mediated isothermal amplification (LAMP) method to amplify three GM rice event-specific junction sequences. Target DNA was amplified and visualized by two indicators (SYBR green or hydroxy naphthol blue [HNB]) within 60 min at an isothermal temperature of 63 °C. Different kinds of plants were selected to ensure the specificity of detection and the results of the non-target samples were negative, indicating that the primer sets for the three GM rice varieties had good levels of specificity. The sensitivity of LAMP, with detection limits at low concentration levels (0.01%–0.005% GM), was 10- to 100-fold greater than that of conventional PCR. Additionally, the LAMP assay coupled with an indicator (SYBR green or HNB) facilitated analysis. These findings revealed that the rapid detection method was suitable as a simple field-based test to determine the status of GM crops.
Polarization properties of an evanescent-wave pumped whispering gallery mode fibre laser
DeYu Han,XiaoYun Pu,Nan Jiang,YongLi Feng,Kun Zhu,YuanXian Zhang
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-009-0698-x
Abstract: The polarization properties of an evanescent-wave pumped Whispering Gallery Mode (WGM) fibre laser have been investigated. It is found that there are two kinds of polarization lasing beam emitting from the evanescent-wave pumped WGM fibre laser under two different pump conditions. When the pump beam is strictly along the axial direction of an optical fibre, the lasing emission is transverse electric wave and the electrical vectors at emitting points are along the radial direction of the fibre, which forms a special radial polarization radiation. However, when the pump beam deviates from the axial direction of the fibre, both transverse electric and transverse magnetic waves exist in the lasing emission, which forms a mixed polarization radiation with radial and axial polarized elements. Based on lasing radiation mechanism of evanescent-wave pumped WGM fibre laser, the observed polarization properties are well explained.
Nutrient status of Populus euphratica growing in desert riparian forests of northwestern China

ShengKui Cao,Qi Feng,JianHua Si,XiaoYun Zhang,GuangChao Cao,KeLong Chen,JingFu Zhu,

寒旱区科学 , 2012,
Abstract: Seasonal and microhabitat variations of chemical constituents of foliar organic carbon (C), total nitrogen (N), total phosphorus (P), and total potassium (K), in Populus euphratica growing in desert riparian forests in northwestern China and their correlations were studied. Results show that ranges of C, N, P and K contents in the leaves of P. euphratica were 39.08%?46.16%, 0.28%?2.81%, 0.05%?0.18% and 0.35%?2.03%, with means of 43.51%, 1.49%, 0.102% and 1.17%, respectively. The ratio of C/N, C/P and N/P changed from 16.26 to 146.61, from 258.08 to 908.67 and from 2.89 to 26.67; the mean was 37.24, 466.27 and 15.14, respectively. The mean N content was significantly lower than of deciduous trees in China, but the mean P content was nearly equivalent. The ratio of C/N was remarkably higher than of global land plants. The ratio of N/P indicated that growth of P. euphratica was jointly limited by N and P nutrient deficiency. During the growth season, total trends of leaf C, N, P and K contents decreased. The maximum appeared in May, and the minimum in September. Among microhabitats, C, N and K contents gradually increased from riparian lowland, flatland, sandpile, Gobi and dune, but C/N ratio was opposite, and P content was not apparent. Foliar C content was extremely, significantly and positively correlated with N and K contents, respectively. The relationships of N-K and P-K were both significantly positive.
Polarization properties of an evanescent-wave pumped whispering gallery mode fibre laser

HAN DeYu,PU XiaoYun,JIANG Nan,FENG YongLi,ZHU Kun &,ZHANG YuanXian,

科学通报(英文版) , 2010,
Abstract: The polarization properties of an evanescent-wave pumped Whispering Gallery Mode(WGM) fibre laser have been investigated. It is found that there are two kinds of polarization lasing beam emitting from the evanescent-wave pumped WGM fibre laser under two different pump conditions.When the pump beam is strictly along the axial direction of an optical fibre,the lasing emission is transverse electric wave and the electrical vectors at emitting points are along the radial direction of the fibre,which forms a spe...
引力和垂线偏差的非奇异公式
Non-singular Formulas for Computing Gravity Vector and Vertical Deviation

朱永超, 万晓云, 于锦海
ZHU Yongchao
, WAN Xiaoyun, YU Jinhai

- , 2017, DOI: 10.13203/j.whugis20150700
Abstract: 基于(Pnm(cosθ))/(sinθ)(m>0)的非奇异递推公式,给出了基于球坐标的引力矢量和垂线偏差非奇异计算公式;针对极点λ可任意取值引起的地方指北坐标系方向的不确定性问题,证明了引力矢量在转换到地心直角坐标系后不随λ的变化而变化,即与λ的取值无关。最终的数值计算结果表明,直角坐标系下的非奇异计算公式与本文提出的球坐标下的非奇异计算公式所得计算结果绝对值差异小于10-16m/s2,证明了该非奇异公式的正确性。最后总结了所有引力位球函数一阶导、二阶导非奇异性计算的一般思路
Targeting p53 via JNK Pathway: A Novel Role of RITA for Apoptotic Signaling in Multiple Myeloma
Manujendra N. Saha, Hua Jiang, Yijun Yang, Xiaoyun Zhu, Xiaoming Wang, Aaron D. Schimmer, Lugui Qiu, Hong Chang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0030215
Abstract: The low frequency of p53 alterations e.g., mutations/deletions (~10%) in multiple myeloma (MM) makes this tumor type an ideal candidate for p53-targeted therapies. RITA is a small molecule which can induce apoptosis in tumor cells by activating the p53 pathway. We previously showed that RITA strongly activates p53 while selectively inhibiting growth of MM cells without inducing genotoxicity, indicating its potential as a drug lead for p53-targeted therapy in MM. However, the molecular mechanisms underlying the pro-apoptotic effect of RITA are largely undefined. Gene expression analysis by microarray identified a significant number of differentially expressed genes associated with stress response including c-Jun N-terminal kinase (JNK) signaling pathway. By Western blot analysis we further confirmed that RITA induced activation of p53 in conjunction with up-regulation of phosphorylated ASK-1, MKK-4 and c-Jun. These results suggest that RITA induced the activation of JNK signaling. Chromatin immunoprecipitation (ChIP) analysis showed that activated c-Jun binds to the activator protein-1 (AP-1) binding site of the p53 promoter region. Disruption of the JNK signal pathway by small interfering RNA (siRNA) against JNK or JNK specific inhibitor, SP-600125 inhibited the activation of p53 and attenuated apoptosis induced by RITA in myeloma cells carrying wild type p53. On the other hand, p53 transcriptional inhibitor, PFT-α or p53 siRNA not only inhibited the activation of p53 transcriptional targets but also blocked the activation of c-Jun suggesting the presence of a positive feedback loop between p53 and JNK. In addition, RITA in combination with dexamethasone, known as a JNK activator, displays synergistic cytotoxic responses in MM cell lines and patient samples. Our study unveils a previously undescribed mechanism of RITA-induced p53-mediated apoptosis through JNK signaling pathway and provides the rationale for combination of p53 activating drugs with JNK activators in the treatment of MM.
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