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Search Results: 1 - 10 of 46448 matches for " TIAN Shi-Yao "
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ZHANG Su-Ying,FAN Bin,CHENG Shi-Ping,LIN Jie-Hu,ZHOU Shi-Yao,WANG Ge-Y,SHI Tian-Shen,

红外与毫米波学报 , 1999,
Abstract: Microstructures of single layer of telluride and telluride/ZnS multilayer on Si and Ge substrates were investigated by XRD and TEM. The correlation between adhesion and microstructure of layers was given.
Effect of banana intercropping pattern and straw compost-return on soil enzyme activity

KUANG Shi-Zi,TIAN Shi-Yao,LI Chun-Yu,YI Gan-Jun,PENG Qun,
,田世尧,李春雨,易干军,彭 群

中国生态农业学报 , 2010,
Abstract: Field experiments were conducted to investigate the effects of three intercropping patterns (banana-soybean, banana-peanut, and banana-ginger) of banana and two straw compost-returns (2.5 or 1.5 kg per plant) on the activity of urease,?catalase,?alkaline phosphatase, and invertase in orchard soils. Intercropping increases urease,?alkaline phosphatase and invertase activity. The highest activity increase occurs in invertase, followed by alkaline phosphatase and urease. On the contrary, intercropping decreases catalase activity. The order of effect of the intercropping patterns on enzyme activity is ranked as banana-soybean>banana-peanut>banana-ginger>banana monoculture. Significant increases are achieved in invertase and urease activity under the straw compost-return treatment, with the highest increment occurring in invertase (34.6%~39.2%), followed by urease (9.7%~28.7%). While catalase activity is slightly influenced, alkaline phosphatase activity is significantly inhibited by straw compost-return. Under straw compost-return, urease activity increases with increasing dose of straw compost while invertase activity slightly increases. Furthermore, catalase activity decreases when straw compost is lower than 2.5 kg per plant.
Transforming Growth Factor-β1 and -β2 in Gastric Precancer and Cancer and Roles in Tumor-Cell Interactions with Peripheral Blood Mononuclear Cells In Vitro
Gui-Fen Ma, Qing Miao, Xiao-Qing Zeng, Tian-Cheng Luo, Li-Li Ma, Yi-Mei Liu, Jing-Jing Lian, Hong Gao, Shi-Yao Chen
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0054249
Abstract: Transforming growth factor-β1 (TGF-β1) and -β2 are correlated with poorer prognosis in gastric cancer (GC), which act in both tumor and immune cells. However, their expressions in precancer and tumor-cell interactions with peripheral blood mononuclear cells (PBMCs) remain unclear. Protein levels of TGF-β1 and -β2 were analyzed by immunohistochemistry and corresponding mRNA levels were determined by quantitative real-time polymerase chain reaction in 93 surgical and biopsy specimens. Serum TGF-β concentration was detected by enzyme-linked immunosorbent assays. AGS and MKN45 cell lines were directly or indirectly cocultured with PBMCs in vitro. TGF-β and Smad molecules were detected after cocultures and the growths of GC cells and PBMCs were assessed by cell proliferation assay. The results showed positive staining for TGF-β1 was detected in 20% of control samples, 52.3% of precancer, 59.1% of early GC and 66.7% of advanced GC samples, correlated with lesion progression (χ2 = 9.487, P = 0.002). All tissues were positive for TGF-β2. TGF-β1 mRNA levels were increased in advanced cancers, while TGF-β2 increased earlier. TGF-β1 mRNA levels were higher in tumor than in peritumor, which positively correlated with Smad2 and Smad7. Serum TGF-β levels were significantly higher in patients with early and advanced cancers compared to controls (TGF-β1:50.08±4.38 and 45.76±5.00 vs. 27.78±6.11 ng/mL; TGF-β2:133.61±21.90 and 111.34±15.76 vs. 59.41±15.42 ng/mL, both P<0.05). The levels of TGF-β1 mRNA and cytokine secretion were higher in GC cells after direct coculture compared to indirect culture. TGF-β1 was decreased and TGF-β2 was increased in PBMCs after cocultures. Moreover, TGF-β1 inhibited the viability of PBMCs but not cancer cells. Collectively, neoplastic transformation may be an early event involving the increase of TGF-β1 in the general and local environment. TGF-β1 production is promoted by the direct interaction between GC cells and PBMCs, which might facilitate cancer development.


物理学报 , 1984,
Abstract: By using quantum method and decorrelation approximation, the twophoton bistability equation in three level atom medium is obtained. The conclusions are consistent with experiment results. The shortcomings in treating this problem by using two-photon vecter model are pointed out.
Esophageal mucosal lesion with low-dose aspirin and prasugrel mimics malignancy: A case report
Gui-Fen Ma,Hong Gao,Shi-Yao Chen
World Journal of Gastroenterology , 2011, DOI: 10.3748/wjg.v17.i35.4048
Abstract: Dual antiplatelet therapy consisting of low-dose aspirin (LDA) and other antiplatelet medications is recommended in patients with coronary heart disease, but it may increase the risk of esophageal lesion and bleeding. We describe a case of esophageal mucosal lesion that was difficult to distinguish from malignancy in a patient with a history of ingesting LDA and prasugrel after implantation of a drug-eluting stent. Multiple auxiliary examinations were performed to make a definite diagnosis. The patient recovered completely after concomitant acid-suppressive therapy. Based on these findings, we strongly argue for the evaluation of the risk of gastrointestinal mucosal injury and hemorrhage if LDA therapy is required, and we stress the paramount importance of using drug combinations in individual patients.
The reversibility of the Goos-H?nchen shift near the band-crossing structure of one-dimemsional photonic crystals containing left-handed metamaterials
Li-Gang Wang,Shi-Yao Zhu
Physics , 2009,
Abstract: We perform a theoretical investigation on the Goos-H\"achen (GH) shift in one-dimensional photonic crystals (1DPCs) containing left-handed metamaterials (LHMs). We find an unusal effect of the GH shift near the photonic band-crossing structure, which is located at the condition, $% -k_{z}^{(A)}d_{A}=k_{z}^{(B)}d_{B}=m\pi $ $(m=1,2,3...)$, under the inclined incident angle, here A denotes the LHM layer and B denotes the dielectric layer. Above the frequency of the band-crossing point (BCP), the GH shift changes from negative to positive as the incident angle increases, while the GH shift changes reversely below the BCP frequency. This effect is explained in terms of the phase property of the band-crossing structure.
More Detailed Descriptions of Locality and Realism
Ping-Xing Chen,Shi-Yao Zhu
Physics , 2007,
Abstract: Many experiments have shown that locality-realism theory is at variance with quantum mechanics predictions. Although locality and realism, which are two different conceptions, are given respective definition, the descriptions of the both are a little of abstract when they are applied to real experimental situations. The abstract descriptions result in difficulty for one to judge whether the variance come from locality or realism or both. Here we provide more detailed descriptions of locality and realism, and show that any system being in a pure state or a non-maximally mixed state has property of non-realism. We also present experimental schemes feasible under current technologies to test the non-locality realsim. The connections between non-locality and entanglement and correlation are also discussed.
Electronic Band gaps and transport properties inside graphene superlattices with one-dimensional periodic squared potentials
Li-Gang Wang,Shi-Yao Zhu
Physics , 2010, DOI: 10.1103/PhysRevB.81.205444
Abstract: The electronic transport properties and band structures for the graphene-based one-dimensional (1D) superlattices with periodic squared potentials are investigated. It is found that a new Dirac point is formed, which is exactly located at the energy which corresponds to the zero (volume) averaged wavenumber inside the 1D periodic potentials. The location of such a new Dirac point is robust against variations in the lattice constants, and it is only dependent on the ratio of potential widths. The zero-averaged wavenumber gap associated with the new Dirac point is insensitive to both the lattice constant and the structural disorder, and the defect mode in the zero-averaged wavenumber gap is weakly dependent on the insident angles of carriers.
An optical diode made from a `flying' photonic crystal
Da-Wei Wang,Joerg Evers,Shi-Yao Zhu
Physics , 2012, DOI: 10.1103/PhysRevLett.110.093901
Abstract: Optical diodes controlling the flow of light are of principal significance for optical information processing 1. They transmit light from an input to an output, but not in reverse direction. This breaking of time reversal symmetry is typically achieved via non-linear 2,3 or magnetic effects 4, which imposes limits to all-optical control 5-7, on-chip integration 7-11, or single-photon operation 12. Here, we propose an optical diode which requires neither magnetic fields nor strong input fields. It is based on a flying photonic crystal. Due to the Doppler effect, the crystal has a band gap with frequency depending on the light propagation direction relative to the crystal motion. Counter-intuitively, our setup does not involve the movement of any material parts. Rather, the flying photonic crystal is realized by optically inducing a spatially periodic but moving modulation of the optical properties of a near-resonant medium. The flying crystal not only opens perspectives for optical diodes operating at low light levels or integrated in small solid state devices, but also enables novel photonic devices such as optically tunable mirrors and cavities.
Effect of atomic distribution on cooperative spontaneous emission
Wei Feng,Yong Li,Shi-Yao Zhu
Physics , 2013, DOI: 10.1103/PhysRevA.89.013816
Abstract: We study cooperative single-photon spontaneous emission from N multilevel atoms for different atomic distributions in optical vector theory. Instead of the average approximation for interatomic distance or the continuum approximation (sums over atoms replaced by integrals) for atomic distribution, the positions of every atom are taken into account by numerical calculation. It is shown that the regularity of atomic distribution has considerable influence on cooperative spontaneous emission. For a small atomic sample (compared with radiation wavelength), to obtain strong superradiance not only needs the uniform excitation (the Dicke state) but also requires the uniform atomic distribution. For a large sample, the uniform atomic distribution is beneficial to subradiance of the Dicke state, while the influence of atomic distribution on the timed Dicke state is weak and its time evolution obeys exponential decay approximately. In addition, we also investigate the corresponding emission spectrum and verify the directed emission for the timed Dicke state for a large atomic sample.
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