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Search Results: 1 - 10 of 48513 matches for " Nan Wu "
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Growth of solutions to higher order linear homogeneous differential equations in angular domains
Nan Wu
Electronic Journal of Differential Equations , 2010,
Abstract: In this article, we discuss the growth of meromorphic solutions to higher order homogeneous differential equations in some angular domains, instead of the whole complex plane.
Comparison of REML and MINQUE for Estimated Variance Components and Predicted Random Effects  [PDF]
Nan Nan, Johnie N. Jenkins, Jack C. McCarty, Jixiang Wu
Open Journal of Statistics (OJS) , 2016, DOI: 10.4236/ojs.2016.65067
Abstract: Linear mixed model (LMM) approaches have been widely applied in many areas of research data analysis because they offer great flexibility for different data structures and linear model systems. In this study, emphasis is placed on comparing the properties of two LMM approaches: restricted maximum likelihood (REML) and minimum norm quadratic unbiased estimation (MINQUE) with and without resampling techniques being included. Bias, testing power, Type I error, and computing time were compared between REML and MINQUE approaches with and without Jackknife technique based on 500 simulated data sets. Results showed that MINQUE and REML methods performed equally regarding bias, Type I error, and power. Jackknife-based MINQUE and REML greatly improved power compared to non-Jackknife based linear mixed model approaches. Results also showed that MINQUE is more time-saving compared to REML, especially with the use of resampling techniques and large data set analysis. Results from the actual cotton data analysis were in agreement with our simulated results. Therefore, Jackknife-based MINQUE approaches could be recommended to achieve desirable power with reduced time for a large data analysis and model simulations.
The Smc complexes in DNA damage response
Nan Wu, Hongtao Yu
Cell & Bioscience , 2012, DOI: 10.1186/2045-3701-2-5
Abstract: The highly conserved structural maintenance of chromosomes (Smc) proteins regulate chromosome architecture and organization from bacteria to human. Most prokaryotes have a single Smc protein which forms a homodimer, while there are at least six Smc family members, Smc1-6, that form three heterodimers in eukaryotic organisms [1] (Figure 1). Smc1 and Smc3 form the core of the cohesin complex which maintains sister-chromatid cohesion during mitosis to ensure accurate chromosome segregation [2]. Smc2 and Smc4 constitute the condensin complexes that promote chromosome condensation [3]. Smc5 and Smc6 form a complex that plays critical roles in DNA repair [4,5].The Smc proteins contain about 1,000 amino acids and share similar domain structures. The ATPase domain of each Smc protein is separated into N- and C-terminal halves by a long linker. The two nucleotide-binding Walker A and Walker B motifs reside in the two different ATPase halves. The Smc linker folds into an intramolecular antiparallel coiled coil and allows the N-terminal ATPase half of an Smc protein to fold back to its C-terminal ATPase half and create a single globular ATPase head (Figure 1). The hinge domain at one end of the coiled coil mediates the heterodimerization of eukaryotic Smc proteins [1,6,7]. The two ATPase heads at the other end of the coiled coil can transiently interact with each other to bind and hydrolyze ATP. As revealed by electron microscopy, the Smc heterodimers can adopt different conformations, including V-shaped dimer and ring-like structures, possibly depending on the nucleotide-binding states of their ATPase heads [8,9]. Each Smc heterodimer associates with non-Smc subunits to form functional Smc complexes.The genomic DNA with a cell experiences many types of damage daily. These damages can result from exogenous factors, such as ultraviolet (UV) radiation, ionizing radiation (IR), and chemical carcinogens, or from endogenous factors, such as stalled replication forks due to replicat
2-(3,4-Dichlorophenyl)-4-phenylbenzo[h]quinoline
Nan Wu,Zhou Xu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811040049
Abstract: In the title compound, C25H15Cl2N, the benzo[h]quinoline system exhibits an approximately planar conformation with an r.m.s. deviation of 0.0202 and a maximum deviation of 0.039 (1) . The aryl group at position 2 is nearly coplanar with the parent ring [dihedral angle = 6.68 (7)°] while the parent ring and the phenyl subsitituent at position 4 form a dihedral angle of 67.11 (4)°. Intermolecular C—H...π interactions stabilize the crystal packing.
Common Borel radius of an algebroid function and its derivative
Nan Wu,Zuxing Xuan
Mathematics , 2009,
Abstract: In this article, by comparing the characteristic functions, we prove that for any $\nu$-valued algebroid function $w(z)$ defined in the unit disk with $\limsup_{r\to1-}T(r,w)/\log\frac{1}{1-r}=\infty$ and the hyper order $\rho_2(w)=0$, the distribution of the Borel radius of $w(z)$ and $w'(z)$ is the same. This is the extension of G. Valiron's conjecture for the meromorphic functions defined in $\widehat{\mathbb{C}}$.
Hayman T Directions of Meromorphic Functions in Some Angular Domains
Wu Nan,Xuan Zuxing
Mathematics , 2009,
Abstract: This paper is devoted to investigate the singular directions of mero- morphic functions in some angular domains. We will confirm the existence of Hayman T directions in some angular domains. This is a continuous work of Yang [Yang L., Borel directions of meromorphic functions in an angular domain, Science in China, Math. Series(I)(1979), 149-163.] and Zheng [Zheng, J.H., Value Distribution of Meromorphic Functions, preprint.].
Constraints on Cosmological Models and Reconstructing the Acceleration History of the Universe with Gamma-Ray Burst Distance Indicators
Nan Liang,Puxun Wu,Shuang Nan Zhang
Physics , 2009, DOI: 10.1103/PhysRevD.81.083518
Abstract: Gamma-ray bursts (GRBs) have been regarded as standard candles at very high redshift for cosmology research. We have proposed a new method to calibrate GRB distance indicators with Type Ia supernova (SNe Ia) data in a completely cosmology-independent way to avoid the circularity problem that had limited the direct use of GRBs to probe cosmology [N. Liang, W. K. Xiao, Y. Liu, and S. N. Zhang, Astrophys. J. 685, 354 (2008).]. In this paper, a simple method is provided to combine GRB data into the joint observational data analysis to constrain cosmological models; in this method those SNe Ia data points used for calibrating the GRB data are not used to avoid any correlation between them. We find that the $\Lambda$CDM model is consistent with the joint data in the 1-$\sigma$ confidence region, using the GRB data at high redshift calibrated with the interpolating method, the Constitution set of SNe Ia, the cosmic microwave background radiation from Wilkinson Microwave Anisotropy Probe five year observation, the baryonic acoustic oscillation from the spectroscopic Sloan Digital Sky Survey Data Release 7 galaxy sample, the x-ray baryon mass fraction in clusters of galaxies, and the observational Hubble parameter versus redshift data. Comparing to the joint constraints with GRBs and without GRBs, we find that the contribution of GRBs to the joint cosmological constraints is a slight shift in the confidence regions of cosmological parameters to better enclose the $\Lambda$CDM model. Finally, we reconstruct the acceleration history of the Universe up to $z>6$ with the distance moduli of SNe Ia and GRBs and find some features that deviate from the $\Lambda$CDM model and seem to favor oscillatory cosmology models; however further investigations are needed to better understand the situation.
City Routing Velocity Estimation Model under theEnvironment of Lack of Floating Car Data  [PDF]
Chun Liu, Nan Li, Meixian Huang, Hangbin Wu
Journal of Geographic Information System (JGIS) , 2012, DOI: 10.4236/jgis.2012.41008
Abstract: After introducing the principle of float car data (FCD), this paper gives the primary flow of pre-handing and map- matching of the FCD. After analyzing the percentage of coverage of FCD on the road network, large quantity of heritage database of routing status is used to estimate the routing velocity when lack of FCD on parts road segments. Multi liner regression model is then put forwarded by considering the spatial correlativity among the road network, and some model parameters are deduced when time series is classified in day and week. Besides, error of velocity probability and error of status probability are achieved based on the result from field testing while the feasibility and reliability of the velocity estimation model is obtained as well. Finally, as a case study in Shanghai center area, the whole routing velocity in the road network is estimated and published in real time.
Inflammation and Carcinogenesis  [PDF]
Yu-Sheng Wu, Shiu-Nan Chen
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.410173
Abstract:

We consider that inflammatory substances play an important role in the carcinogenesis process. In the process, cytokines and growth factor secreted by cells can actively recruit immune cells in the carcinogenesis microenvironment, further, promote carcinogenesis progression. The carcinogenesis microenvironment even subverted the immune system, moreover, enhanced the carcinogenesis through immune suppressive mechanisms within the carcinogenesis microenvironment.

Cosmological evolution of interacting phantom (quintessence) model in Loop Quantum Gravity
Puxun Wu,Shuang Nan Zhang
Physics , 2008, DOI: 10.1088/1475-7516/2008/06/007
Abstract: The dynamics of interacting dark energy model in loop quantum cosmology (LQC) is studied in this paper. The dark energy has a constant equation of state $w_x$ and interacts with dark matter through a form $3cH(\rho_x+\rho_m)$. We find for quintessence model ($w_x>-1$) the cosmological evolution in LQC is the same as that in classical Einstein cosmology; whereas for phantom dark energy ($w_x<-1$), although there are the same critical points in LQC and classical Einstein cosmology, loop quantum effect reduces significantly the parameter spacetime ($c, w_x$) required by stability. If parameters $c$ and $w_x$ satisfy the conditions that the critical points are existent and stable, the universe will enter an era dominated by dark energy and dark matter with a constant energy ratio between them, and accelerate forever; otherwise it will enter an oscillatory regime. Comparing our results with the observations we find at $1\sigma$ confidence level the universe will accelerate forever.
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