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Search Results: 1 - 10 of 58750 matches for " Z. Zhu "
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Two-photon excitation for C2V molecules based on the full relativistic theory  [PDF]
Z. H. Zhu
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.43026
Abstract: The present work explores a new phenomenon that not all the transition probability of two photon processes is negligible at low irradiance. The irreducible representation 2B2 of C2v is unexpected, for there is no much deviation in oscillator strength for two-photon and single-photon process A1 to 2B2. This new phenomenon is only possible to be explored by the symmetrical consideration: the necessary and sufficient condition is molecular plane coincident with yz plane or the operation σv(yz) for group C2v. It is only possible to be evaluated out by use of the full relativistic quantum mechanical theory.
Aspects of red soil properties and water management in China
Cao Z.,Zhu X.
International Agrophysics , 1999,
Abstract: This paper is a brief reviev of studies on red soil water properties and its management in the tropics and subtropics of China. Although annual precipitation is more than evaporation, there is still seasonal draught in the area because of the uneven distribution of both rainfall and evaporation. Red soil structure is another reason for the seasonal draught. Several measures for alleviating this da-mage are also discussed in the paper.
Tunable Bending Stiffness, Buckling Force, and Natural Frequency of Nanowires and Nanoplates  [PDF]
Hanxing Zhu, Z. B. Wang, T. X. Fan, D. Zhang
World Journal of Nano Science and Engineering (WJNSE) , 2012, DOI: 10.4236/wjnse.2012.23021
Abstract: This paper aims to obtain the simple closed-form results for the combined effects of surface elasticity, initial stress/ strain, and material Poisson ratio on the bending stiffness, natural frequency and buckling force of nanowires and nano-plates. The results demonstrate that all these properties of nanowires or nanoplates can be designed either very sensitive or not sensitive at all to the amplitude of an applied electric potential; show how much of those properties can be controlled to vary; and thus provide a reliable guide to the measurement of the Young’s modulus of nanowires/nanoplates and to the design of nano-devices, such as nano-sensors or the cantilever of an AFM.
Reality of Complex Affine Toda Solitons
Z. Zhu,D. G. Caldi
Physics , 1994, DOI: 10.1063/1.531194
Abstract: There are infinitely many topological solitons in any given complex affine Toda theories and most of them have complex energy density. When we require the energy density of the solitons to be real, we find that the reality condition is related to a simple ``pairing condition.'' Unfortunately, rather few soliton solutions in these theories survive the reality constraint, especially if one also demands positivity. The resulting implications for the physical applicability of these theories are briefly discussed.
Multi--Soliton Solutions of Affine Toda Models
Z. Zhu,D. G. Caldi
Physics , 1993, DOI: 10.1016/0550-3213(94)00326-A
Abstract: Hirota's method is used to construct multi--soliton and plane--wave solutions for affine Toda field theories with imaginary coupling.
A phase I pharmacokinetic study of ursolic acid nanoliposomes in healthy volunteers and patients with advanced solid tumors
Zhu Z,Qian Z,Yan Z,Zhao C
International Journal of Nanomedicine , 2013,
Abstract: Zhongling Zhu,1,4 Zhengzi Qian,2,4 Zhao Yan,1,4 Cuicui Zhao,2,4 Huaqing Wang,2,4 Guoguang Ying3,41Department of Clinical Pharmacology, 2Department of Lymphoma, 3Laboratory of Tumor Cell Biology, Tianjin Medical University Cancer Institute and Hospital, Tianjin, People's Republic of China; 4Key Laboratory of Cancer Prevention and Therapy, Tianjin, People’s Republic of ChinaBackground: Ursolic acid is a promising anticancer agent. The current study aims to evaluate the single- and multiple-dose pharmacokinetics (PK) as well as the safety of ursolic acid nanoliposomes (UANL) in healthy volunteers and in patients with advanced solid tumors.Methods: Twenty-four healthy volunteers in the single-dose PK study were divided into three different groups, which received 37, 74, and 98 mg/m2 of UANL. Eight patients in the multiple-dose PK study were administered with 74 mg/m2 of UANL daily for 14 days. The UA plasma concentrations were determined using ultra-performance liquid chromatograph-tandem mass spectrometry.Results: The plasma concentration profiles of all subjects were characterized by a biexponential decline after infusion. The mean peak plasma concentration (Cmax) increased linearly as a function of the dose (r = 0.999). The mean area under the plasma concentration-time curve (AUC) from 0 to 16 hours also increased proportionally with dose escalation (r = 0.998). However, the clearance was constant over the specific dose interval. In the multiple-dose PK study, the trough and average concentrations remained low. The mean AUC, half-life, Cmax, time to Cmax, and the volume of distribution on the first day were similar to those on the last day. All subjects tolerated the treatments well. Most UANL-associated adverse events varied from mild to moderate.Conclusions: UANL exhibits relatively linear PK behavior with dose levels from 37 mg/m2 to 98 mg/m2. No drug accumulation was observed with repeated doses of UANL. The intravenous infusion of UANL was well tolerated by healthy volunteers and patients with advanced tumors.Keywords: ursolic acid, nanoliposomes, pharmacokinetics, solid tumor, ultra-performance liquid chromatography, tandem mass spectrometry
Sensitivity of deexcitation energies of superdeformed secondary minima to the density dependence of symmetry energy with the relativistic mean-field theory
W. Z. Jiang,Z. Z. Ren,Z. Q. Sheng,Z. Y. Zhu
Physics , 2010, DOI: 10.1140/epja/i2010-10962-6
Abstract: The relationship between deexcitation energies of superdeformed secondary minima relative to ground states and the density dependence of the symmetry energy is investigated for heavy nuclei using the relativistic mean field (RMF) model. It is shown that the deexcitation energies of superdeformed secondary minima are sensitive to differences in the symmetry energy that are mimicked by the isoscalar-isovector coupling included in the model. With deliberate investigations on a few Hg isotopes that have data of deexcitation energies, we find that the description for the deexcitation energies can be improved due to the softening of the symmetry energy. Further, we have investigated deexcitation energies of odd-odd heavy nuclei that are nearly independent of pairing correlations, and have discussed the possible extraction of the constraint on the density dependence of the symmetry energy with the measurement of deexcitation energies of these nuclei.
'Dutch' vs 'British', an inducible model of IL-13 effects in emphysema
O'Brien Christopher,Zheng T,Zhu Z,Wang Z
Respiratory Research , 2001, DOI: 10.1186/rr-2001-68544
Boundary Element Analysis of Two Dimensional Structure Water Entry Based on Attached Water Quality  [PDF]
L. Zou, Z. Zong, S. Feng, G. X. Zhu, G. P. Yu
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.48163
Combining nonlinear boundary conditions of free liquid surface, the impact force of wedge shape profile and the change of free liquid surface were calculated and analyzed based on the solving ideas of Von Karman T. The results were compared with the results of the existing literature, and the results were in good agreement with the existing results. In addition, the impact forces of U profile and the external drift profile were calculated, and the impact load of two kinds of profiles were analyzed through time evolution.
An Ensemble Kalman Filter for severe dust storm data assimilation over China
C. Lin, Z. Wang,J. Zhu
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2008,
Abstract: An Ensemble Kalman Filter (EnKF) data assimilation system was developed for a regional dust transport model. This paper applied the EnKF method to investigate modeling of severe dust storm episodes occurring in March 2002 over China based on surface observations of dust concentrations to explore the impact of the EnKF data assimilation systems on forecast improvement. A series of sensitivity experiments using our system demonstrates the ability of the advanced EnKF assimilation method using surface observed PM10 in North China to correct initial conditions, which leads to improved forecasts of dust storms. However, large errors in the forecast may arise from model errors (uncertainties in meteorological fields, dust emissions, dry deposition velocity, etc.). This result illustrates that the EnKF requires identification and correction model errors during the assimilation procedure in order to significantly improve forecasts. Results also show that the EnKF should use a large inflation parameter to obtain better model performance and forecast potential. Furthermore, the ensemble perturbations generated at the initial time should include enough ensemble spreads to represent the background error after several assimilation cycles.
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