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Search Results: 1 - 10 of 334895 matches for " Z. J. Tao "
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Search For Non-Standard Model CP/T violation At Tau-Charm Factory
T. Huang,W. Lu,Z. J. Tao
Physics , 1996, DOI: 10.1103/PhysRevD.55.1643
Abstract: We systematically investigate the possibility of finding CP/T violation in the $\tau$ sector at Tau-Charm Factory. CP/T violation may occur at $\tau$ pair production process, expressed as electric dipole moment, and at $tau$ decay processes. By assuming that electric dipole moment as large as $10^{-19}$e-cm and CP/T violation effect orignating from $\tau$ decay as large as $10^{-3}$ are observable at Tau-Charm Factory, we studied all the possible extensions of the SM which are relevent for generating CP/T violation in $\tau$ sector. And we pointed there are a few kind of models, which are hopeful for generating such CP/T violation. For these models we consider all the theoretical and current experimental constraints and find that there exists some parameter space which will result in a measurable CP/T violation. Therefore we conclude that Tau-Charm Factory is a hopeful place to discover CP/T violation in $\tau$ sector.
Phase stability and magnetic-field-induced martensitic transformation in Mn-rich NiMnSn alloys
Q. Tao,Z. D. Han,J. J. Wang,B. Qian
AIP Advances , 2012, DOI: 10.1063/1.4772626
Abstract: A series of Ni50-xMn41+xSn9 (x = 0–19) alloys from Ni-rich to Mn-rich composition were prepared, and the composition dependence of phase transitions and magnetic properties were investigated. No γ-phase can be observed until x = 17. Martensitic transformation from ferromagnetic austenite to weak-magnetic or ferromagnetic martensite was observed in alloys with Mn content between 52 and 58, and magnetic-field-induced transformation was confirmed. A large magnetization change of 44 Am2/kg across the martensitic transformation is observed in Ni37Mn54Sn9. Our results indicate that Mn-rich Ni-Mn-Sn alloys show promise as metamagnetic shape memory alloys.
Cyclic RGD peptide-modified liposomal drug delivery system: enhanced cellular uptake in vitro and improved pharmacokinetics in rats
Chen Z, Deng J, Zhao Y, Tao T
International Journal of Nanomedicine , 2012, DOI: http://dx.doi.org/10.2147/IJN.S33541
Abstract: lic RGD peptide-modified liposomal drug delivery system: enhanced cellular uptake in vitro and improved pharmacokinetics in rats Original Research (2769) Total Article Views Authors: Chen Z, Deng J, Zhao Y, Tao T Published Date July 2012 Volume 2012:7 Pages 3803 - 3811 DOI: http://dx.doi.org/10.2147/IJN.S33541 Received: 03 May 2012 Accepted: 31 May 2012 Published: 18 July 2012 Zhongya Chen,1,2 Jiaxin Deng,1,2 Yan Zhao,1,2 Tao Tao1,2 1National Pharmaceutical Engineering Research Center, 2Shanghai Institute of Pharmaceutical Industry, China State Institute of Pharmaceutical Industry, Shanghai, People's Republic of China Background: Integrins αvβ3 and αvβ5, both of which specifically recognize the Arg-Gly-Asp (RGD) motif, are overexpressed on many solid tumors and in tumor neovasculature. Thus, coupling the RGD motif to the liposomal surface for achieving active targeting can be a promising strategy for the treatment of tumors. Methods: Cyclo(Arg-Gly-Asp-D-Phe-Cys) (cRGD) was covalently coupled with the liposomal membrane surface, followed by coating with poly(ethylene glycol) (PEG) using the post-insertion technique. The coupling efficiency of cRGD was determined. Doxorubicin as a model anticancer drug was loaded into liposomes using an ammonium sulfate gradient method to investigate the encapsulation efficiency, cellular uptake by the integrin-overexpressing human glioma cell line U87MG in vitro, and pharmacokinetic properties in Sprague-Dawley rats. Results: cRGD was conjugated to the liposomal surface by a thiol-maleimide coupling reaction. The coupling efficiency reached 98%. The encapsulation efficiency of doxorubicin in liposomes was more than 98%. The flow cytometry test result showed that cRGD-modified liposomes (RGD-DXRL-PEG) had higher cell uptake by U87MG cells, compared with nontargeted liposomes (DXRL-PEG). The cellular uptake was significantly inhibited in the presence of excess free cRGD. Both the targeted (t1/2 = 24.10 hours) and non-targeted (t1/2 = 25.32 hours) liposomes showed long circulating properties in rat plasma. The area under the curve of the targeted and nontargeted liposomes was 6.4-fold and 8.3-fold higher than that of doxorubicin solution, respectively. Conclusion: This study indicates preferential targeting and long circulating properties for cRGD-modified liposomes in vivo, which could be used as a potential targeted liposomal drug delivery system to treat human glioma.
Effect of land cover on atmospheric processes and air quality over the continental United States – a NASA unified WRF (NU-WRF) model study
Z. Tao,J. A. Santanello,M. Chin,S. Zhou
Atmospheric Chemistry and Physics Discussions , 2013, DOI: 10.5194/acpd-13-5429-2013
Abstract: The land surface plays a crucial role in regulating water and energy fluxes at the land–atmosphere (L–A) interface and controls many processes and feedbacks in the climate system. Land cover and vegetation type remains one key determinant of soil moisture content that impacts air temperature, planetary boundary layer (PBL) evolution, and precipitation through soil moisture–evapotranspiration coupling. In turn it will affect atmospheric chemistry and air quality. This paper presents the results of a modeling study of the effect of land cover on some key L–A processes with a focus on air quality. The newly developed NASA Unified Weather Research and Forecast (NU-WRF) modeling system couples NASA's Land Information System (LIS) with the community WRF model and allows users to explore the L–A processes and feedbacks. Three commonly used satellite-derived land cover datasets, i.e. from the US Geological Survey (USGS) and University of Maryland (UMD) that are based on the Advanced Very High Resolution Radiometer (AVHRR) and from the Moderate Resolution Imaging Spectroradiometer (MODIS), bear large differences in agriculture, forest, grassland, and urban spatial distributions in the continental United States, and thus provide an excellent case to investigate how land cover change would impact atmospheric processes and air quality. The weeklong simulations demonstrate the noticeable differences in soil moisture/temperature, latent/sensible heat flux, PBL height, wind, NO2/ozone, and PM2.5 air quality. These discrepancies can be traced to associate with the land cover properties, e.g. stomatal resistance, albedo and emissivity, and roughness characteristics. It also implies that the rapid urban growth may have complex air quality implications with reductions in peak ozone but more frequent high ozone events.
DNA damage by the cobalt (II) and zinc (II) complexes of tetraazamacrocyclic in Tetrahymena thermophila
Z Xu, R Shi, W Wang, R Tao, J Bi, Z Wei
African Journal of Biotechnology , 2008,
Abstract: Using the single cell gel electrophoresis method, the tetraazamacrocycle Zn(II) complex (Zn(II)-L) and the tetraazamacrocycle Co(II) complex (Co(II)-L) were investigated focusing on their DNA damage to Tetrahymena thermophila. When the cells were treated with the 0.05, 0.25 and 0.50 mg/ml Zn(II)-L, the tail length increased significantly, with 10.83, 11.56 and 11.87 m, respectively. With the dose of 0.5 mg/ml Zn(II)-L treatment, 45.5% cells distributed in grade 3. After treatment with the 0.05, 0.25 and 0.50 mg/ml Co(II)-L, the tail length of the cells also increased significantly, with the length of 15.64, 17.75 and 19.21 m, respectively. When treated with 0.5 mg/ml Co(II)-L, 98.1% cells showed tail and 75.6% cells distributed in grade 3. The results indicated that Co(II)-L induced a relatively high level of DNA damage in comparison with the level of damage induced by Zn(II)-L.
Model analyses of atmospheric mercury: present air quality and effects of transpacific transport on the United States
H. Lei,X.-Z. Liang,D. J. Wuebbles,Z. Tao
Atmospheric Chemistry and Physics Discussions , 2013, DOI: 10.5194/acpd-13-9849-2013
Abstract: Atmospheric mercury is a toxic air and water pollutant that is of significant concern because of its effects on human health and ecosystems. A mechanistic representation of the atmospheric mercury cycle is developed for the state-of-the-art global climate-chemistry model, CAM-Chem (Community Atmospheric Model with Chemistry). The model simulates the emission, transport, transformation and deposition of atmospheric mercury (Hg) in three forms: elemental mercury (Hg(0)), reactive mercury (Hg(II)), and particulate mercury (PHg). Emissions of mercury include those from human, land, ocean, biomass burning and volcano related sources. Land emissions are calculated based on surface solar radiation flux and skin temperature. A simplified air–sea mercury exchange scheme is used to calculate emissions from the oceans. The chemistry mechanism includes the oxidation of Hg(0) in gaseous phase by ozone with temperature dependence, OH, H2O2 and chlorine. Aqueous chemistry includes both oxidation and reduction of Hg(0). Transport and deposition of mercury species are calculated through adapting the original formulations in CAM-Chem. The CAM-Chem model with mercury is driven by present meteorology to simulate the present mercury air quality during the 1999–2001 periods. The resulting surface concentrations of total gaseous mercury (TGM) are then compared with the observations from worldwide sites. Simulated wet depositions of mercury over the continental United States are compared to the observations from 26 Mercury Deposition Network stations to test the wet deposition simulations. The evaluations of gaseous concentrations and wet deposition confirm a strong capability for the CAM-Chem mercury mechanism to simulate the atmospheric mercury cycle. The results also indicate that mercury pollution in East Asia and Southern Africa is very significant with TGM concentrations above 3.0 ng m 3. The comparison to wet deposition indicates that wet deposition patterns of mercury are more affected by the spatial variability of precipitation. The sensitivity experiments show that 22% of total mercury deposition and 25% of TGM concentrations in the United States are resulted from domestic anthropogenic sources, but only 9% of total mercury deposition and 7% of TGM concentrations are contributed by transpacific transport. However, the contributions of domestic and transpacific sources on the western United States levels of mercury are of comparable magnitude.
Chinese Herbal Medicine Combined Conventional Chemotherapy Regimens in Advanced Recurrent Breast Mammary Carcinoma  [PDF]
M. Hu, R. Z. Chen, L. L. Zhu, C. J. Tao, T. G. Wang, X. D. Xia, P. Li, Y. L. Gong, G. M. Lv
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.410182
Abstract:

Purpose: Aiming at starting the ball rolling and contributing humble effort to promoting traditional Chinese medicine, we report one successful case of GP regimen of combining chemotherapy with traditional Chinese medicine decoction (lung description) for breast cancer with lung and bone metastases. Patients and Methods: A second-line chemotherapy regimen of GP (cisplatin + gemcitabine) was applied. In the meantime, we administered Chinese herbal medicine (Fei Decoction, mixed with a variety of effective herbal components) to help her recover from the poor condition. Results: The tumor markers (CEA, CA15-3) had dramatically decreased to the normal range. Both lung and bone metastatic sites reduced according to CT and ECT imaging, and this patient felt free from the complaint of pulmonary and cardiac discomfort. The quality of life has been greatly improved, and the PFS (Progression-Free-Survival) and TTP (Time-to-Progression) have been prolonged from the onset to date. Conclusions: In the course of this combined treatment, it has been

Superconducting Gap, Pseudogap and Their Relationship Investigated by Break-junction Tunneling Spectroscopy on $Bi_2Sr_2CaCu_2O_{8+δ}$ Single Crystals
Y. Xuan,H. J. Tao,Z. Z. Li,C. T. Lin,Y. M. Ni,B. R. Zhao,Z. X. Zhao
Physics , 2001,
Abstract: Temperature and doping dependent tunneling spectroscopy on $Bi_2Sr_2CaCu_2O_{8+\delta}$ single crystals has been investigated by using break-junction technique. The results provide direct evidence that the pseudogap persists into heavily overdoped regime, possibly in whole doping range of the superconducting phase. The gap value determined from the peak-to-peak of the conductance, $\Delta_{p-p}$, exhibits a jump-like increase as $T$ is raised across the critical temperature. The magnitude of the jump, the pseudogap opening temperature and superconducting gap decrease with raising doping. The $\Delta_{p-p}$ below $T_c$ can be naturally treated as the vector sum of two competing orders: a BCS-like superconducting gap and a residual pseudogap.
Polymer Photovoltaic Cell Using /G-PEDOT Nanocomplex Film as Electrode
F. X. Xie,C. J. Liang,Z. Q. He,Y. L. Tao
International Journal of Photoenergy , 2008, DOI: 10.1155/2008/415861
Abstract: Using TiO2/G-PEDOT (PEDOT/PSS doped with glycerol) nanocomplex film as a substitute for metal electrode in organic photovoltaic cell is described. Indium tin oxide (ITO) worked as cathode and TiO2/G-PEDOT nanocomplex works as anode. The thickness of TiO2 layer in nanocomplex greatly affects the act of this nonmetallic electrode of the device. To enhance its performance, this inverted organic photovoltaic cell uses another TiO2 layer as electron selective layer contacted to ITO coated glass substrates. All films made by solution processing techniques are coated on the transparent substrate (glass) with a conducting film ITO. The efficiency of this solar cell is compared with the conventional device using Al as electrode.
Extrinsic and Intrinsic Frequency Dispersion of High-k Materials in Capacitance-Voltage Measurements
J. Tao,C. Z. Zhao,C. Zhao,P. Taechakumput,M. Werner,S. Taylor,P. R. Chalker
Materials , 2012, DOI: 10.3390/ma5061005
Abstract: In capacitance-voltage (C-V) measurements, frequency dispersion in high- k dielectrics is often observed. The frequency dependence of the dielectric constant ( k-value), that is the intrinsic frequency dispersion, could not be assessed before suppressing the effects of extrinsic frequency dispersion, such as the effects of the lossy interfacial layer (between the high- k thin film and silicon substrate) and the parasitic effects. The effect of the lossy interfacial layer on frequency dispersion was investigated and modeled based on a dual frequency technique. The significance of parasitic effects (including series resistance and the back metal contact of the metal-oxide-semiconductor (MOS) capacitor) on frequency dispersion was also studied. The effect of surface roughness on frequency dispersion is also discussed. After taking extrinsic frequency dispersion into account, the relaxation behavior can be modeled using the Curie-von Schweidler (CS) law, the Kohlrausch-Williams-Watts (KWW) relationship and the Havriliak-Negami (HN) relationship. Dielectric relaxation mechanisms are also discussed.
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