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Search Results: 1 - 10 of 19228 matches for " Kun Luo "
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A Contrast Study on Investment and Profit Analytic Model of Staff Training
Kun Shang,Wenbiao Luo
International Journal of Business and Management , 2009,
Abstract: Based on the application of all kinds of effect evaluation theories, we did a contrast study on investment and profit model of staff training. We first analyzed the significance and state quo of effect evaluation, then introduced all cost and profit measuring models, and then compared them to achieve the characteristics of the models; finally we presented directions on the future development and study emphases.
Gallus Heat shock cognate protein 70, a novel binding partner of Apoptin
Kun Chen, Zheng Luo, Shijun J Zheng
Virology Journal , 2011, DOI: 10.1186/1743-422x-8-324
Abstract: Using yeast two-hybrid and colony-life filter approaches we got five positive yeast clones. Through sequencing and BLASTed against NCBI, one of the clones was confirmed containing Gallus heat shock cognate protein 70 (Hsc70). Hsc70 gene was clone into pRK5-Flag plasmid, coimmunoprecipitation assay show both exogenous Hsc70 and endogenous Hsc70 can interact with Apoptin. Truncated Apoptin expression plasmids were made and coimmunoprecipitation were performed, the results show the binding domain of Apoptin with Hsc70 is located between amino acids 30-60. Truncated expression plasmids of Hsc70 were also constructed and coimmunoprecipitation were performed, the results show the peptide-binding and variable domains of Hsc70 are responsible for the binding to Apoptin. Confocal assays were performed and results show that under physiological condition Hsc70 is predominantly distributed in cytoplasm, whereas Hsc70 is translocated into the nuclei and colocalized with Apoptin in the presence of Apoptin in DF-1 cell. Functional studies show that Apoptin markedly down-regulate the mRNA level of RelA/p65 in DF-1 cell. To explore the effect of Hsc70 on Apoptin-mediated RelA/p65 gene expression, we have searched two Hsc70 RNAi sequences, and found that all of them dramatically inhibited the expression of endogenous Hsc70, with the #2 Hsc70 RNAi sequence being the most effective. Knockdown of Hsc70 show Apoptin-inhibited RelA/p65 expression was abolished. Our data demonstrate that Hsc70 is responsible for the down-regulation of Apoptin induced RelA/p65 gene expression.We identified Gallus Hsc70 as an Apoptin binding protein and showed the translocation of Hsc70 into the nuclei of DF-1 cells treated with Apoptin. Hsc70 regulates RelA/p65 gene expression induced by Apoptin.Chicken anemia virus (CAV) infection of newly hatched chickens causes considerable health problems and economic losses in the poultry industry worldwide. In newborn chickens CAV infection causes immunosuppression, a
Simulation of freezing and melting of soil on the northeast Tibetan Plateau
Kun Xia,Yong Luo,WeiPing Li
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4542-8
Abstract: Using observational data spanning the period from February to December 2009 and recorded at the Suli station in Qinghai Province, the land-surface model CLM3.0 was employed to simulate the freezing and melting of soil. The results indicate that the simulated soil temperature is higher than the observed soil temperature and the ultimate thawing date is earlier than the observed date during the melting period. During the freezing period, the simulated soil temperature is lower than the observed soil temperature and the ultimate freezing of the deep soil is earlier than that observed. Overall, the simulation of freezing is better than that of melting, and the simulation of a shallow layer is better than that of a deeper layer. In the original CLM3.0, it is assumed that frozen soil begins to melt when the soil temperature exceeds 0°C, which is inconsistent with observations. The critical freeze-thaw temperature was calculated according to thermodynamics equations and the freeze-thaw condition was modified. In this work, the melting rate for frozen soil was reduced using the modified scheme, and the simulated soil temperature was lowered. Meanwhile, the refreezing of soil during the melting season was well simulated and more closely matched observations. Additionally, it was found that the rates of melting and freezing differ, with the former being slower than the latter, but refreezing during the melting season is rather quick.
Transitional phenomenon of particle dispersion in gas-solid two-phase flows
Kun Luo,JianRen Fan,KeFa Cen
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0055-x
Abstract: Without using any turbulent model, direct numerical simulation of a three-dimensional gas-solid two-phase turbulent jet was performed by finite volume method. The effects on dispersion of particles with different Stokes numbers by the transitional behavior of turbulent structures were investigated. To produce high-resolution results and reduce the computation and storage, the fractional-step projection algorithm was used to solve the governing equations of gas phase fluid. The low-storage, three-order Runge-Kutta scheme was used for time integration. The governing equations of particles were solved in the Lagrangian framework. These numerical schemes were validated by the good agreement between the statistical results of flow field and the related experimental data. In the study of particle dispersion, it was found that the effects on particle dispersion by the spanwise vortex structures were prominent. The new behaviors of particle dispersion were also observed during the evolution of the flow field, i.e. the transitional phenomenon of particle dispersion occurs for the particles with small and intermediate Stokes numbers.
OPTIMUM DURATION OF MEASUREMENT FOR REDUCING THERMAL NOISE LIMITATIONS IN TORSION PENDULUM EXPERIMENTS

HU ZHONG-KUN,LUO JUN,

中国物理 B , 1998,
Abstract: Statistical estimates of thermal noise fluctuation of a linear harmonic oscillator used to detect weak forces are reexamined with special reference to gravitational experiments. Thermal noise limitation on the measurement of displacement of an oscillator is studied. It is found that the signal response of an oscillator reaches the maximum value while the thermal noise response reaches the minimum value at the same time during the transient state of the oscillator, and the precision of the experiments in the transient state could increase about two orders higher than that in the equilibrium state for typical experiments. It is also found that there is an optimum duration of measurement in which the uncertainty due to thermal noise in this period is the least.
Snow depth simulated by BATS-SAST model and its improvement

Kun Xia,Yong Luo,WeiPing Li,

寒旱区科学 , 2010,
Abstract: A BATS-SAST model was employed to simulate the snow processes in four snow cases of Sk_OJP 2001/2002, 2002/2003, 2003/2004 and Sk_HarvestJP 2003/2004 of Canada. At Sk_OJP site we modified the long-wave radiation and precipitation schemes. Considering the different interceptions between rain and snow and the effect of wind and canopy temperature on snow download, we improved the canopy interception model. At Sk_HarvestJP site we modified the snow cover fraction scheme. Results show that the model reasonably simulates the basic processes of snow cover. The modified model, which considers the part of the long-wave radiation and precipitation transmitted through the canopy at Sk_OJP site, can increase the simulation of snow depth which is closer to the observations. The improved canopy interception model, which influences the variation of snow depth under the canopy by changing canopy interception, is a great improvement on simulation of snow depth, especially on the ablation of snow cover. At Sk_HarvestJP site, there are obvious improvements on simulation of snow depth on the ablation of snow cover.
An Epistemic Model Checking Approach to Web Service Compositions
Xiangyu Luo,Kun Wang,Fengchai Wang
International Journal of Wireless and Microwave Technologies , 2012, DOI: 10.5815/ijwmt.2012.06.10
Abstract: Due to the dynamics of Web services, the openness and variability of Internet, and the loosely-coupled developing approach of Web services, the development and execution process of Web service compositions becomes uncertain, which imperils the trustworthy properties. In this paper we abstract Web service compositions as multi-agent systems, propose a formal model BSTS for modeling BPEL, develop and implement two translation algorithms B2S and S2I, to translate BPEL into BSTS and translate BSTS into the input language ISPL of the model checker MCMAS for multi-agent systems, respectively. The proposed method supports not only temporal properties, but also epistemic and cooperation properties, which are supported only in multi-agent systems. We implemented the prototype tool, called MCWS, for the proposed method. We modeled and verified an example of Web service compositions. The experimental results show the validity of MCWS.
A Symplecticity-preserving Gas-kinetic Scheme for Hydrodynamic Equations under Gravitational Field
Jun Luo,Kun Xu,Na Liu
Physics , 2010,
Abstract: A well-balanced scheme for a gravitational hydrodynamic system is defined as a scheme which could precisely preserve a hydrostatic isothermal solution. In this paper, we will construct a well-balanced gas-kinetic symplecticity-preserving BGK (SP-BGK) scheme. In order to develop such a scheme, we model the gravitational potential as a piecewise step function with a potential jump at the cell interface. At the same time, the Liouville's theorem and symplecticity preserving property of a Hamiltonian flow have been used in the description of particles penetration, reflection, and deformation through a potential barrier. The use of the symplecticity preserving property for a Hamiltonian flow is crucial in the evaluation of the high-order moments of a gas distribution function when crossing through a potential jump. As far as we know, the SP-BGK method is the first shock capturing Navier-Stokes flow solver with well-balanced property for a gravitational hydrodynamic system. A few theorems will be proved for this scheme, which include the necessity to use an exact Maxwellian for keeping the hydrostatic state, the total mass and energy (the sum of kinetic, thermal, and gravitational ones) conservation, and the well-balanced property to keep a hydrostatic state during particle transport and collision processes. Many numerical examples will be presented to validate the SP-BGK scheme.
Photometric study and period analysis of the contact binary XZ Leonis
Changqing Luo,Xiaobin. Zhang,Licai Deng,Kun Wang,Yangping Luo
Physics , 2015, DOI: 10.1088/0004-6256/150/3/70
Abstract: We present multi-color CCD photometry of the neglected contact binary XZ Leo. Completely covered VRI band light curves and four times of minimum light were obtained. Combining the photometric and previously published radial velocity data, a revised photometric analysis was carried out for the binary system by applying the Wilson-Devinney code. With a hot spot placed on the massive primary component near the neck region of the common envelope, the light curves were satisfactorily modeled. The photometric solution combined with the radial velocity solution reveals that XZ Leo is an A-type contact binary with a degree of contact of 24($\pm1)\%$. The absolute parameters of the components were determined as M_1 = 1.74($\pm$0.06)M_\odot, M_2 = 0.61($\pm$0.02)M_\odot, R_1 = 1.69($\pm$0.01)R_\odot, R_2 = 1.07($\pm0.01$)R_\odot, L_1 = 6.73($\pm0.08$) L_\odot, L_2 = 2.40($\pm$0.04)L_\odot. Based on all the available data, the long-term orbital period behavior of the system was investigated. It indicates that the binary system was undergoing continuous orbital period increase in the past three decades with a rate of dP/dt = + 6.12 \times {10^{-8}} days yr^{-1}, which suggests a probable mass transfer from the secondary to the primary component at a rate of dM/dt= 3.92\times 10^{-8} M_\odot yr^{-1}. The binary system is expected to evolve into the broken-contact stage in $1.56 \times 10^6$ years. This could be evidence supporting the Thermal Relaxation Oscillation theory.
Transitional phenomenon of particle dispersion in gas-solid two-phase flows
LUO Kun,FAN JianRen,CEN KeFa,
LUO
,Kun,FAN,JianRen,CEN,KeFa

科学通报(英文版) , 2007,
Abstract: Without using any turbulent model, direct numerical simulation of a three-dimensional gas-solid two-phase turbulent jet was performed by finite volume method. The effects on dispersion of particles with different Stokes numbers by the transitional behavior of turbulent structures were investigated. To produce high-resolution results and reduce the computation and storage, the fractional-step projection algorithm was used to solve the governing equations of gas phase fluid. The low-storage, three-order Runge-Kutta scheme was used for time integration. The governing equations of particles were solved in the Lagrangian framework. These numerical schemes were validated by the good agreement be-tween the statistical results of flow field and the related experimental data. In the study of particle dis-persion, it was found that the effects on particle dispersion by the spanwise vortex structures were prominent. The new behaviors of particle dispersion were also observed during the evolution of the flow field, i.e. the transitional phenomenon of particle dispersion occurs for the particles with small and intermediate Stokes numbers.
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