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Search Results: 1 - 10 of 225934 matches for " G Zhao "
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MPSO Algorithm Based QoS Parameter Optimization for LTE Networks  [PDF]
F. L. Zhao, G. T. Chen
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2017, DOI: 10.4236/ijcns.2017.105B001
Abstract:
QoS Optimization is an important part of LTE SON, but not yet defined in the specification. We discuss modeling the problem of QoS optimization, improve the fitness function, then provide an algorithm based on MPSO to search the optimal QoS parameter value set for LTE networks. Simulation results show that the algorithm converges more quickly and more accurately than the GA which can be applied in LTE SON.
Effects of acetic, propionic and butyric acids given intraruminally at different molar proportions or individually on rumen papillae growth and IGF-I and IGFBP-3 in plasma, liver and rumen tissue in growing sheep nourished by total intragastric infusions
S Ma, G Zhao
African Journal of Biotechnology , 2010,
Abstract: Two experiments were conducted to evaluate effects of acetic, propionic and butyric acids given intraruminally at different molar proportions or individually on the rumen papillae growth and insulinlike growth factor-I (IGF-I), IGF binding protein-3 (IGFBP-3), growth hormone (GH) and insulin in plasma and/or tissues in growing sheep nourished by total intragastric infusions. The animals were daily infused with volatile fatty acids (VFA) mixtures at different molar proportions or individual VFA, casein, glucose and corn oil for a total of 1.2 times of maintenance requirement of energy and protein for 12 days. At the end of each experiment, the sheep were slaughtered and blood and tissue samples were obtained for determination of rumen papillae growth and hormones mentioned above. The present study indicated that the papillae growth and IGF-I concentration in rumen tissue of growing sheep nourished by intragastric infusions were not affected significantly by VFA mixtures with different molar proportions or by acetic, propionic and butyric acids individually (P > 0.05) when they were supplied at the same energy level and the synthesis and secretion of IGF-I could be more associated with the energy level rather than energy source of VFA.
Molecular targeting of liposomal nanoparticles to tumor microenvironment
Zhao G, Rodriguez BL
International Journal of Nanomedicine , 2013, DOI: http://dx.doi.org/10.2147/IJN.S37859
Abstract: lecular targeting of liposomal nanoparticles to tumor microenvironment Review (1760) Total Article Views Authors: Zhao G, Rodriguez BL Published Date December 2012 Volume 2013:8 Pages 61 - 71 DOI: http://dx.doi.org/10.2147/IJN.S37859 Received: 07 September 2012 Accepted: 06 November 2012 Published: 28 December 2012 Gang Zhao,1,2 B Leticia Rodriguez2 1Institute of Materia Medica, Shandong Academy of Medical Science, Shandong, China; 2Pharmaceutics Division, College of Pharmacy, The University of Texas at Austin, Austin, TX, USA Abstract: Liposomes are biodegradable and can be used to deliver drugs at a much higher concentration in tumor tissues than in normal tissues. Both passive and active drug delivery by liposomal nanoparticles can significantly reduce the toxic side effects of anticancer drugs and enhance the therapeutic efficacy of the drugs delivered. Active liposomal targeting to tumors is achieved by recognizing specific tumor receptors through tumor-specific ligands or antibodies coupled onto the surface of the liposomes, or by stimulus-sensitive drug carriers such as acid-triggered release or enzyme-triggered drug release. Tumors are often composed of tumor cells and nontumor cells, which include endothelial cells, pericytes, fibroblasts, stromal, mesenchymal cells, innate, and adaptive immune cells. These nontumor cells thus form the tumor microenvironment, which could be targeted and modified so that it is unfavorable for tumor cells to grow. In this review, we briefly summarized articles that had taken advantage of liposomal nanoparticles as a carrier to deliver anticancer drugs to the tumor microenvironment, and how they overcame obstacles such as nonspecific uptake, interaction with components in blood, and toxicity. Special attention is devoted to the liposomal targeting of anticancer drugs to the endothelium of tumor neovasculature, tumor associated macrophages, fibroblasts, and pericytes within the tumor microenvironment.
Molecular targeting of liposomal nanoparticles to tumor microenvironment
Zhao G,Rodriguez BL
International Journal of Nanomedicine , 2012,
Abstract: Gang Zhao,1,2 B Leticia Rodriguez21Institute of Materia Medica, Shandong Academy of Medical Science, Shandong, China; 2Pharmaceutics Division, College of Pharmacy, The University of Texas at Austin, Austin, TX, USAAbstract: Liposomes are biodegradable and can be used to deliver drugs at a much higher concentration in tumor tissues than in normal tissues. Both passive and active drug delivery by liposomal nanoparticles can significantly reduce the toxic side effects of anticancer drugs and enhance the therapeutic efficacy of the drugs delivered. Active liposomal targeting to tumors is achieved by recognizing specific tumor receptors through tumor-specific ligands or antibodies coupled onto the surface of the liposomes, or by stimulus-sensitive drug carriers such as acid-triggered release or enzyme-triggered drug release. Tumors are often composed of tumor cells and nontumor cells, which include endothelial cells, pericytes, fibroblasts, stromal, mesenchymal cells, innate, and adaptive immune cells. These nontumor cells thus form the tumor microenvironment, which could be targeted and modified so that it is unfavorable for tumor cells to grow. In this review, we briefly summarized articles that had taken advantage of liposomal nanoparticles as a carrier to deliver anticancer drugs to the tumor microenvironment, and how they overcame obstacles such as nonspecific uptake, interaction with components in blood, and toxicity. Special attention is devoted to the liposomal targeting of anticancer drugs to the endothelium of tumor neovasculature, tumor associated macrophages, fibroblasts, and pericytes within the tumor microenvironment.Keywords: tumor microenvironment, endothelium, neovasculature, tumor-associated macrophages, cationic liposomes, ligand- or antibody-mediated targeting
Double-exchange is not the cause of ferromagnetism in doped manganites
G. M. Zhao
Physics , 2000, DOI: 10.1103/PhysRevB.62.11639
Abstract: The coexistence of ferromagnetism and metallic conduction in doped manganites has long been explained by a double-exchange model in which the ferromagnetic exchange arises from the carrier hopping. We evaluate the zero-temperature spin stiffness D(0) and the Curie temperature T_{C} on the basis of the double-exchange model using the measured values of the bare bandwidth W and the Hund's rule coupling J_{H}. The calculated D(0) and T_{C} values are too small compared with the observed ones even in the absence of interactions. A realistic onsite interorbital Coulomb repulsion can reduce D(0) substantially in the case of a 2-orbital model. Furthermore, experiment shows that D(0) is simply proportional to x in La_{1-x}Sr_{x}MnO_{3} system, independent of whether the ground state is a ferromagnetic insulator or metal. These results strongly suggest that the ferromagnetism in manganites does not originate from the double-exchange interaction. On the other hand, an alternative model based on the d-p exchange can semi-quantitatively explain the ferromagnetism of doped manganites at low temperatures.
R-values in Low Energy e^+e^- Annihilation
Z. G. Zhao
Physics , 2000, DOI: 10.1142/S0217751X00001887
Abstract: This presentation briefly summarizes the recent measurements of R-values in low energy e^+e^- annihilation. The new experiments aimed at reducing the uncertainties in R-values and performed with the upgraded Beijing Spectrometer (BESII) at Beijing Electron Positron Collider (BEPC) in Beijing and with CMD-2 and SND at VEEP-2M in Novosibirsk are reviewed and discussed.
Non-LTE analysis of neutral magnesium in cool stars
G. Zhao,T. Gehren
Physics , 2000,
Abstract: Calculations of the statistical equilibrium of magnesium in the solar photosphere have shown that NLTE populations hardly affect Mg line formation in the Sun. However, in metal-poor dwarfs and giants the influence of electron collisions is reduced, and the ultraviolet radiation field, enhanced due to reduced background line opacity, results in more pronounced NLTE effects. In thephotosphere of a cool star excitation and ionization due to collisions with neutral hydrogen can outweigh electron collisions. Analyses based on NLTE populations lead to significantly higher Mg abundances than those calculated from LTE. We calculate magnesium abundances in 10 cool dwarfs and subgiants with metallicities from -2.29 to 0.0. The results are based on spectra of high-resolution and high signal-to-noise ratio. Stellar effective temperatures are derived from Balmer line profiles,surface gravities from Hipparcos parallaxes and the wings of the MgIb triplet, and metal abundances and microturbulence velocities are obtained from LTE analyses of FeII line profiles. For stars with metallicities between -2.0 < [Fe/H] < -1.0 abundance corrections Delta{[Mg/H]_{NLTE-LTE}} ~ 0.05 - 0.11 are found. As expected the corrections increase with decreasing metal abundance, and they increase slightly with decreasing surface gravity. We also calculate the statistical equilibrium of magnesium for series of model atmospheres with different stellar parameters and find that $\Delta{\rm [Mg/H]_{NLTE-LTE}}$ increases with effective temperature between 5200 and 6500 K. For extremely metal-poor stars the abundance corrections approach Delta{[Mg/H]_{NLTE-LTE}} ~ 0.23 at [Fe/H] ~ -3.0.
Comment on ``Off-stoichiometry mechanism of the isotope effect in manganites''
G. M. Zhao
Physics , 2001,
Abstract: In a recent paper, Nagaev cited the unpublished paper by Franck et al.to support his theoretical model for the mechanism of the giant isotope effect observed in La_{1-x}Ca_{x}MnO_{3+y} (x = 0.20, y > 0). His model suggests that the off-stoichiometric oxygen content depends strongly on the oxygen isotope mass, which leads to a giant oxygen-isotope effect. Here I show that his theoretical model is not consistent with any experimental results (even the results recently published by Franck et al.), and his estimate of polaronic bandwidth is wrong due to his misuse of polaronic theories.
Unconventional phonon-mediated superconductivity in MgB_{2}
G. M. Zhao
Physics , 2001, DOI: 10.1088/1367-2630/4/1/303
Abstract: We have evaluated the total carrier mass enhancement factor f_{t} for MgB_{2} from two independent experiments (specific heat and upper critical field). These experiments consistently show that f_{t} = 3.1\pm0.1. The unusually large f_{t} is incompatible with the measured reduced gap (2\Delta (0)/k_{B}T_{c} = 4.1) and the total isotope-effect exponent (\alpha = 0.28\pm0.04) within the conventional phonon-mediated model. We propose an unconventional phonon-mediated mechanism, which is able to quantitatively explain the values of T_{c}, f_{t}, \alpha, and the reduced energy gap in a consistent way.
BES Recent Results and Future Plans
Z. G. Zhao
Physics , 2000,
Abstract: We report the preliminary R values for all the 85 energy points scanned in the energy region of 2-5 GeV with the upgraded Beijing Spectrometer (BESII) at Beijing Electron Positron Collider (BEPC). Preliminary results from the J/psi data collected with both BESI and BESII are presented. Measurements of the branching fraction of the psi(2S) decays and the psi(2S) resonance parameters are reported. The future plans, i.e. significantly upgrade the machine and detector are also discussed.
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