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Articles by Y. Shen
Total Records ( 3 ) for Y. Shen
  Y. Shen , J. Baoa , N. Dai , J. Wu , F. Gu , J.C. Tao and J.C. Zhang
  Two classes of important nano-materials, mesoporous titania (MT) and CdSe quantum dots, are prepared via chemical methods. Rapid immobilization of CdSe quantum dots into mesoporous titania has been achieved and the composite system is characterized by high-resolution transmission electron microscopy and photoluminescence. The band-to-band photoluminescence emission of CdSe quantum dots is blue-shifted for 20nm after the dots are immobilized into mesoporous titania. Loading CdSe quantum dots into mesoporous titania leads to speedy photoelectric exchange process of the system and a significant rise in photoconductivity (for a factor of 8), which would attract great deal of attention in quantum dots solar cell.
  Y Guan and Y. Shen

We introduce a new estimation method for parametric intensity function models of inhomogeneous spatial point processes based on weighted estimating equations. The weights can incorporate information on both inhomogeneity and dependence of the process. Simulations show that significant efficiency gains can be achieved for non-Poisson processes, compared to the Poisson maximum likelihood estimator. An application to tropical forest data illustrates the use of the proposed method.

  T. Taechowisan , N. Chuaychot , S. Chanaphat , A. Wanbanjob and Y. Shen
  Four flavonoids including kaempferol (1), isoscutellarin (2), umbelliferone (3) and cichoriin (4) have been isolated from Streptomyces sp. Tc052, an endophyte in the root tissue of Alpinia galanga Swartz. The evaluation for protective effect of compounds 1-4 against glutamate-induced cytotoxicity in hippocampal HT22 cell line was conducted. Compounds 1 and 2 showed significant effective protection ratios of 62.4+2.8 and 55.3+3.4%, respectively, at a concentration of 100 μM, whereas compounds 3-4 were inactive. Compounds 1 and 2 showed potent scavenging effects on DPPH radical exhibiting IC50 value of 60.74 and 75.65 μM, respectively. These results suggest that compounds 1 and 2 may possess the neuroprotective activity against oxidative cellular injuries.
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