Higher Education Institutes

Guangzhou, China

Higher Education Institutes

Guangzhou, China
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Yi J.,South China Normal University | Li X.,South China Normal University | Li X.,Higher Education Institutes | Hu S.,South China Normal University | And 6 more authors.
Rare Metals | Year: 2011

TiO 2-coated SnO 2 (TCS) hollow spheres, which are new anode materials for lithium ion (Li-ion) batteries, were prepared and characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), and galvanostatic charge/discharge tests. The results obtained from XRD, SEM, and TEM show that TiO 2 can be uniformly coated on the surface of SnO 2 hollow spheres with the assistance of anionic surfactant. The cyclic voltammograms indicate that both TiO 2 and SnO 2 exhibit the activity for Li-ion storage. The charge/discharge tests show that the prepared TCS hollow spheres have a higher reversible coulomb efficiency and a better cycling stability than the uncoated SnO 2 hollow spheres. amp;© The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2011.

Zhu Z.,South China Agricultural University | Zhu Z.,Key Laboratory of Biology | Zhu Z.,Higher Education Institutes | Xu X.,South China Agricultural University | And 18 more authors.
Plant Cell, Tissue and Organ Culture | Year: 2015

Improvement of biotic and abiotic stress tolerance without yield decrease has been a great challenge in vegetable breeding. Functional stacking of multiple resistant genes could potentially be an effective strategy against more different stress. Here, we report that constitutive co-expression of Arabidopsis thaliana homodomain-leucine zipper transcription factor Enhanced Drought Tolerance/HOMEODOMAIN GLABROUS11 (AtEDT1/HDG11) and Bacillus thuringiensisCry2Aa2 was able to increase pepper drought tolerance and insect resistance. More importantly, fruit yield was improved under both normal and drought stress conditions. The improved tolerance to drought stress was associated with improved root system and reduced stomatal density. Compared to the non-transgenic control, the transgenic pepper plants also had higher levels of chlorophyll content, chlorophyll fluorescence (Fm/Fv), proline, soluble sugar, abscisic acid, and ROS scavenging capacity under dehydration stress conditions. The increased flower number, elevated fruit weight, and improved fruit number all contributed to the increased yield of transgenic pepper. In addition, bioassays showed that the transgenic plants were effective to control the Prodenia litura, producing a mortality rate of 81.3 % after 5 days of infection. Therefore, our study indicates that stacking of AtEDT1/HDG11 and Cry2Aa2 in pepper plants can improve drought tolerance and insect resistance, demonstrating application of AtEDT1/HDG11 and Cry2Aa2 has the potential to enhance drought tolerance and insect resistance. © 2015, Springer Science+Business Media Dordrecht.

Zhang X.L.,Guangzhou University | Zhang X.L.,Higher Education Institutes | Tang Y.,Guangzhou University | Tang Y.,Higher Education Institutes
Applied Mechanics and Materials | Year: 2014

Ensuring data privacy and improving query performance are two closely linked challenges for outsourced databases. Using mixed encryption methods to data attributes can reach an explicit trade-off between these two challenges. However, encryption cannot always conceal relations between attributes values. When the data tuples are accessed selectively, inferences based on comparing encrypted values could be launched and sensitive values may be disclosed. In this paper, we explore the attribute based inferences in mixed encrypted databases. We develop a method to construct private indexes on encrypted values to defend against inference while supporting efficient selective access to encrypted data. We have conducted some experiments to validate our proposed method. © (2014) Trans Tech Publications, Switzerland.

Yuan W.,Higher Education Institutes | Hu J.,Higher Education Institutes | Zhou B.,Higher Education Institutes | Deng J.,Higher Education Institutes | And 2 more authors.
Functional Materials Letters | Year: 2015

The passive direct methanol fuel cell (DMFC) is a promising candidate power source for portable applications but has to deal with many technical challenges before practical use. This study presents a preliminary investigation on the use of a woven carbon fiber fabric (WCFF) for constructing a gradient porous structure based on the traditional design. The WCFF, carbon paper and carbon-black micro porous layer (MPL) combine into a carbon-based assembly which acts as a mass-transfer-controlling medium at the anode of a passive DMFC. Results show that this novel setup is able to significantly improve the cell performance and facilitate high-concentration operation. A maximum power density of 16.4 mWcm-2 is obtained when two layers of the WCFF are used at a methanol concentration of 8M. This work provides an effective method for using concentrated methanol with no need for major change of the fuel cell configuration. © 2015 World Scientific Publishing Company.

Wu Y.,Guangzhou University | Wu Y.,Key Laboratory of Reproductive Medicine of Guangdong Province | Wu Y.,Key Laboratory for Major Obstetric Diseases of Guangdong Province | Wu Y.,Higher Education Institutes | And 4 more authors.
PLoS ONE | Year: 2015

Although the adverse effects of maternal aging on reproductive outcomes have been investigated widely, there is no consensus on the impact of paternal age. Therefore, we investigated the effect of paternal age on reproductive outcomes in a retrospective analysis of 9,991 in vitro fertilization (IVF) cycles performed at the Reproductive Medicine Center of the Third Affiliated Hospital of Guangzhou Medical University (China) between January 2007 and October 2013. Samples were grouped according to maternal age [<30 (3,327 cycles), 30-34 (4,587 cycles), and 35-38 (2,077 cycles)] and then subgrouped according to paternal age (<30, 30-32, 33-35, 36-38, 39-41, and ≥42). The groups did not differ in terms of fertilization rate, numbers of viable and high-quality embryos and miscarriage rate when controlling maternal age (P >0.05). Chi-squared analysis revealed that there were no differences in implantation and pregnancy rates among the different paternal age groups when maternal age was <30 and 35-38 years (P >0.05). However, implantation and pregnancy rates decreased with paternal age in the 31-34 y maternal age group (P <0.05). Our study indicates that paternal age has no impact on fertilization rate, embryo quality at the cleavage stage and miscarriage rate. For the 30-34 y maternal age group, the implantation rate decreased with increased paternal age, with the pregnancy rate in this group being significantly higher in the paternal <30 y and 30-32 y age groups, compared with those in the 36-38 y and 39-41 y groups. Copyright: © 2015 Wu et al.

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