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Search Results: 1 - 10 of 46404 matches for " Tian-tai Guo "
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Development of Networked Virtual Experiment System Based on Virtual Campus
Tian-tai Guo,Lin GUO,Dong-sheng LI
International Journal of Modern Education and Computer Science , 2009,
Abstract: China’s higher education has been going through a period of rapid expansion in undergraduate population,and this means a much heavier demand on teaching resources such as laboratories, experiments, teaching staff,etc., which cannot possibly be made available all of a sudden.To deal with this situation, we found virtual reality (VR) technology very helpful. Virtual reality (VR) has found many applications in education; and the resources of virtual education such as virtual campus, virtual laboratory etc. are used more and more widely, especially in the field of higher education. But so far virtual campus was mainly regarded as a means of image exhibition, and virtual laboratories were no more than 2D display of experimental processes and equipments. To make better use of these resources, this paper puts forward the concept of networked virtual experiment systems based on virtual campus by combining the virtual laboratory and virtual campus with the technique of LAN (Local area network), and establishes its theoretical model. Finally, a networked virtual experiment system based on virtual campus is developed using VRML and 3DSMAX. Networked virtual experiment system based on virtual campus has a promising future for various applications in higher education.


系统科学与数学 , 1993,
Abstract: Network degign with a fixed investment is a very difficult problem.In this paper a trans-formation of the problem into a 0-1 generalized network one is given and a new solution isobtained.Preliminary computation results indicate that the solution is quite efficient.
Anti-Inflammatory Activity of Methyl Salicylate Glycosides Isolated from Gaultheria yunnanensis (Franch.) Rehder
Dan Zhang,Rui Liu,Lan Sun,Chao Huang,Chao Wang,Dong-Ming Zhang,Tian-Tai Zhang,Guan-Hua Du
Molecules , 2011, DOI: 10.3390/molecules16053875
Abstract: Gaultheria yunnanensis (Franch.) Rehder is a kind of traditional Chinese herbal medicine used for the treatments of rheumatoid arthritis, swelling and pain. Two methyl salicylate glycosides, namely methyl benzoate-2-O-b-D-xylopyranosyl(1-6)-O-b-D-gluco-pyranoside (J12122) and methyl benzoate-2-O-β-D-xylopyranosyl(1-2)[O-β-D-xylopyranosyl(1-6)]-O-β-D-glucopyranoside (J12123), are natural salicylic derivatives isolated from Gaultheria yunnanensis. In this study, we investigated the anti-inflammatory activity of J12122 and J12123 on LPS-induced RAW264.7 macrophage cells by measuring the production of pro-inflammatory cytokines, accumulation of nitric oxide (NO), and level of reactive oxygen species (ROS). The results showed that both methyl salicylate glycosides dose-dependently inhibited the production of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), and IL-6, respectively. Consistent with these observations, J12122 and J12123 significantly suppressed the accumulation of NO, with an inhibitory rate of 56.20% and 51.72% at 3.0 μg/mL concentration, respectively. Furthermore, the two methyl salicylate glycosides reduced the level of ROS induced by LPS. These results showed that the isolated compounds possess anti-inflammatory properties through inhibition the production pro-inflammatory cytokines, NO, and ROS.
The chemical constituents from the roots of Gentiana crassicaulis and their inhibitory effects on inflammatory mediators NO and TNF-α
Tao Lv,Min Xu,Dong Wang,Hong-Tao Zhu,Chong-Ren Yang,Tian-Tai Zhang,Ying-Jun Zhang
Natural Products and Bioprospecting , 2012, DOI: 10.1007/s13659-012-0067-3
Optical Nonlinearity of Subwavelength Metal-dielectric Gratings: Effects of Strong Anisotropy

KANG Xiu-Bao,TIAN Tai-He,WANG Zhi-Guo,

中国物理快报 , 2011,
Cancer-Associated Fibroblasts from Hepatocellular Carcinoma Promote Malignant Cell Proliferation by HGF Secretion
Chang-Chang Jia, Tian-Tian Wang, Wei Liu, Bin-Sheng Fu, XueFeng Hua, Guo-Ying Wang, Tuan-Jie Li, Xing Li, Xiang-Yuan Wu, Yan Tai, Jie Zhou, Gui-Hua Chen, Qi Zhang
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0063243
Abstract: Cancer-associated fibroblasts (CAFs) are reported to support tumorigenesis by stimulating angiogenesis, cancer cell proliferation, and invasion in most solid tumors. However, the roles of CAFs in the liver cancer microenvironment have not been thoroughly studied. In our previous study, we successfully isolated CAFs from hepatocellular carcinoma (HCC) (H-CAFs) and proved that H-CAFs suppressed the activation of NK cells and thereby created favorable conditions for HCC progression. In our present study, we found that the proliferation of MHCC97L and Hep3B cells was significantly promoted by treatment with conditioned medium from H-CAFs. Pathological analysis also revealed that H-CAFs increased the proportion of Ki-67 (+) malignant cells and prevented them from undergoing necrosis. Moreover, the concentration of hepatocyte growth factor (HGF) cytokine in the conditioned medium of H-CAFs was higher than conditioned medium from normal skin fibroblasts (NSFs). Anti-HGF significantly reduced the proliferation-promoting capability of H-CAFs. In addition, we found that the abundance of H-CAFs correlated positively with tumor size. These results indicate that H-CAFs are an important factor for promoting the growth of HCC in vitro and in vivo, and that HGF plays a key role in HCC proliferation induced by H-CAFs.
Electricity generated from Ambient Heat by Pencils
Zihan Xu,Guo'an Tai
Physics , 2012,
Abstract: The idea of generating electricity from ambient heat has significant meanings for both science and engineering. Here, we present an interesting idea of using pencil leads, which are made of graphite and clay, to generate electricity from the thermal motion of ions in aqueous electrolyte solution at room temperature. When two pencil leads were placed in parallel in the solutions, output power of 0.655, 1.023, 1.023 and 1.828 nW were generated in 3 M KCl, NaCl, NiCl2 and CuCl2 solutions, respectively. Besides, we also demonstrate that two pieces of reduced graphene oxide films and /or few-layer graphene films can generate much more electricity when dipped into the solutions, while there was no electrodes contact with the solution. This finding further verified that the electricity was not resulted from the chemical reaction between the electrodes and the solutions. The results also demonstrate that ambient thermal energy can be harvested with low dimensional materials, such as graphene, or with the surface of solid material without the presence of temperature gradient. However, the mechanism is still unclear.
Electricity Harvested from Ambient Heat across Silicon Surface
Guo'an Tai,Zihan Xu
Physics , 2012, DOI: 10.1063/1.4825269
Abstract: We report that electricity can be generated from limitless thermal motion of ions by two dimensional (2D) surface of silicon wafer at room temperature. A typical silicon device, on which asymmetric electrodes with Au and Ag thin films were fabricated, can generate a typical open-circuit voltage up to 0.40 V in 5 M CuCl2 solution and an output current over 11 {\mu}A when a 25 k{\Omega} resistor was loaded into the circuit. Positive correlation between the output current and the temperature, as well as the concentration, was observed. The maximum output current and power density are 17 {\mu}A and 8.6 {\mu}W/cm2, respectively. The possibility of chemical reaction was excluded by four groups of control experiments. A possible dynamic drag mechanism was proposed to explain the experimental results. This finding further demonstrates that ambient heat in the environment can be harvested by 2D semiconductor surfaces or low dimensional materials and would contribute significantly to the research of renewable energy. However, this finding does not agree with the second law of thermal dynamatics. A lot of future work will be needed to study the mechanism behind this phenomenon.
The ZigBee Based Wireless Sensor and Actor Network in Intelligent Space Oriented to Home Service Robot  [PDF]
Fei Lu, Guo-Hui Tian
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2012, DOI: 10.4236/ijcns.2012.55037
Abstract: In the study of intelligent space oriented to home service robot, an important technology is how to construct an communication network which has the characters of high reliability and easy building. In this paper, based on the characteristics of ZigBee protocol, ZigBee technology is used to construct a wireless sensor and actor network. Several intelligent services based on ZigBee wireless sensor and actor network are shown to certify the reliability of this communication network. ZigBee wireless sensor and actor network builds an information bridge for the components in the intelligent space, the spatially distributed devices are connected together seamlessly. With this network, robot can share the mass information in the intelligent space and improve its performance with \"light-packs\", devices in intelligent space, such as lamp, curtain can be controlled autonomously.
Fabrication of Si Radiation Detector with Plane Technology

ZHANG Tai ping,ZHANG Lu,NING Bao jun,TIAN Da yu,LIU Shi mei,WANG Wei,ZHANG Jie tian,GUO Zhao qiao,CHEN Shi yuan,

半导体学报 , 2001,
Abstract: The fabrication of PIN silicon detector has been described in details with some advanced microelectronic technologies,including oxidation,lithography and implantation and annealing.Slowly decrease the temperature after HCl handling,a low dark current (reverse current) can be obtained.At -5V,the performanc of the detector is perfect,and the leakage current is 10nA/cm 2.The relationship between the dark current and the minority carrier lifetime has also been discussed,as well as the measuring method of the minority carrier lifetime.
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