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Search Results: 1 - 10 of 53644 matches for " Wei Huan "
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Late-time phantom universe in ${\bf SO(1,1)}$ dark energy model with exponential potential
Yi-Huan Wei
Physics , 2004, DOI: 10.1142/S0217732305016774
Abstract: We discuss the late-time property of universe and phantom field in the SO(1,1) dark energy model for the potential $V=V_0e^{-\beta\Phi^\alpha}$ with $\alpha$ and $\beta$ two positive constants. We assume in advance some conditions satisfied by the late-time field to simplify equations, which are confirmed to be correct from the eventual results. For $\alpha<2$, the filed falls exponentially off and the phantom equation of state rapidly approaches -1. When $\alpha=2$, the kinetic energy $\rho_k$ and the coupling energy $\rho_c$ become comparable but there is always $\rho_k<-\rho_c$ so that the phantom property of field proceeds to hold. The analysis on the perturbation to the late-time field $\Phi$ illustrates the square effective mass of the perturbation field is always positive and thus the phantom is stable. The universe considered currently may evade the future sudden singularity and will evolve to de Sitter expansion phase.
Big Rip in SO(1,1) phantom universe
Yi-Huan Wei
Physics , 2005,
Abstract: For the inverse linear potential, the SO(1,1) field behaves as phantom for late time and the Big Rip will occur. The field approaches zero as time approaches the Big Rip, here. For this potential the phantom equation of state takes the late-time minimum $w_\Phi=-3$. We give some discussions that the Big Rip in the SO(1,1) model may be treated as either the transition point of universe from expansion to extract phase or the final state. In the latter picture of the universe, the field has the $T$ symmetry and the scale factor possesses the $CT$ symmetry, for which the SO(1,1) charge $\bar{Q}$ plays a crucial role.
Where are your eyes going to look during reading? A critical evaluation of saccade targeting hypothesis
Yanping Liu,Huan Wei
Quantitative Biology , 2015,
Abstract: The word-based account of saccades drawn by a central gravity of the PVL is supported by two pillars of evidences. The first is the finding of the initial fixation location on a word resembled a normal distribution (Rayner, 1979). The other is the finding of a moderate slope coefficient between the launch site and the landing site (b=0.49, see McConkie, Kerr, Reddix, & Zola, 1988). Four simulations on different saccade targeting strategies and one eye-movement experiment of Chinese reading have been conducted to evaluate the two findings. We demonstrated that the current understanding of the word-based account is not conclusive by showing an alternative strategy of the word-based account and identifying the problem with the calculation of the slope coefficient. Although almost all the computational models of eye-movement control during reading have built on the two findings, future efforts should be directed to understand the precise contribution of different saccade targeting strategies, and to know how their weighting might vary across desperate writing systems.
Analysis of Fretting Fatigue Crack Initiation in a Riveted Two Aluminum Specimen  [PDF]
Huan Li, Ran Guo, He Ming Cheng, Yeqing Wei
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.16010
Abstract: Based on the existing experiment results, the fretting fatigue contact geometry of a riveted two aluminum specimen was studied using the finite element method. The contact stress fields of the inner and outer contact edges on the two specimen’s up and down surface under different contact friction coefficient and the fatigue loads were analyzed, the influences of the contact friction coefficient and remote stress on crack initiation were discussed. The results were in well agreement with the observations of the existing experiments, that is, the crack initiated places of the first aluminum specimen change from the area of 900 to 450, and the crack initiated places of the second aluminum specimen change from the area of 900 to 1350 with the increase of the friction coefficient and the remote stress.
Analysis on the clinical and endoscopic parameters in 1247 patients with reflux esophagitis  [PDF]
Xiao Zhang, Huan Wang, Wei’an Wang, Xiaoguang Chen, Haifeng Liu
Open Journal of Gastroenterology (OJGas) , 2014, DOI: 10.4236/ojgas.2014.41004
Abstract: Aim: To summarize and analyze the clinical and endoscopic parameters in patients with reflux esophagitis(RE). Methods1247 patients with RE were diagnosed in our hospital endoscopy center from September 2010 to August 2012. The general information of the patients and the relationship between endoscopic classification and concomitant diseases were analyzed. Results: According to the endoscopic findings, 1247 subjects (4.70%) were found to have RE932 (74.74%) males and 315 (25.26%) females, and the male to female ratio was 2.96:1. The peak age of prevalence was 50 to 59 (27.35%) which is followed by 40 to 49 (23.10%). In this study, most of the patients had a mild degree of esophagitis representing LA-A in 60.63% and LA-B in 34.24%. The antrum hyperemia was found in 291 patients with esophagitis (23.34%), followed by antrum erosion (20.13%) and hatal hernia (15.88%). There is no statistically significant relevance between Helicobacter pylori infection and RE (P > 0.05), but Barrett’s esophagus, duodenal ulcer, gastroesophageal tumors, a history of gastroesophageal surgery and antrum hyperemia were found to be associated with RE (P < 0.05). Conclusion: The prevalence rate of endoscopic RE in our study was 4.70%, and most patients had a mild grade esophagitis. Male, advanced age, Barrett’s esophagus, duodenal ulcer, gastroesophageal tumors and a history of gastroesophageal surgery are the risk factors of esophagitis. Antrum hyperemia may reduce the severity of RE.
A Case Study of Elementary Teachers’ Use of Instruction Time in Mathematics  [PDF]
Wei-Min Hsu, Huan-Hsieh Kuo
Creative Education (CE) , 2016, DOI: 10.4236/ce.2016.717242
Abstract: This study probed into elementary school teachers’ use of instruction time in mathematics on the basis of a case study. Recording a teacher with 20 years’ teaching experience in his classroom and having interviews with him for six months, this study aims to understand the teacher’s use of mathematics instruction time and the influencing factors on this case. According to the results, the teacher in this case tends to divide his teaching activities into review and preview, new content development, interactions and discussions, and exercises and applications. In each class, he would carry out these activities. As the teaching of a module advanced, less instruction time is spent on new content development and more on interactions, discussions, exercises and applications. In terms of the factors influential on the instruction time use, the teacher in this case takes into account mainly the students’ learning initiatives in mathematics and their learning motives, and rarely considers other factors.
Quasi-Local Energy Distribution of the Modified Reissner--Nordstr m Black Hole

WEI Yi-Huan,

中国物理快报 , 2008,
Abstract: We discuss the energy distribution of the modified Reissner--Nordstr m black hole. It is suggested that the quasi-local energy distribution from Einstein energy-momentum complex should be appropriate. For the Reissner-ordstr m spacetime, it can be seen that the energies of the outer and inner regions are exactly equivalent.
Effective first law of thermodynamics of black holes with two horizons

Wei Yi-Huan,

中国物理 B , 2009,
Abstract: For a black hole with two horizons, the effective entropy is assumed to be a linear combination of the two entropies of the outer and inner horizons. In terms of the effective thermodynamic quantities the effective Bekenstein-Smarr formula and the effective first law of thermodynamics are derived.
Average Rank-Based Score to Measure Deregulation of Molecular Pathway Gene Sets
Huan Yang, Chao Cheng, Wei Zhang
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0027579
Abstract: Background Deregulation of biological pathways has been shown to be involved in the turmorigenesis of a variety of cancers. The co-regulation of pathways in tumor and normal tissues has not been studied in a systematic manner. Results In this study we propose a novel statistic named AR-score (average rank based score) to measure pathway activities based on microarray gene expression profiles. We calculate and compare the AR-scores of pathways in microarray datasets containing expression profiles for a wide range of cancer types as well as the corresponding normal tissues. We find that many pathways undergo significant activity changes in tumors with respect to normal tissues. AR-scores for a small subset of pathways are capable of distinguishing tumor from normal tissues or classifying tumor subtypes. In normal tissues many pathways are highly correlated in their activities, whereas their correlations reduce significantly in tumors and cancer cell lines. The co-expression of genes in the same pathways was also significantly perturbed in tumors. Conclusions The co-regulation of genes in the same pathways and co-regulation of different pathways are significantly perturbed in tumors versus normal tissues. Our method provides a useful tool for better understanding the mechanistic changes in tumors, which can also be used for exploring other biological problems.
Existence Result for Impulsive Differential Equations with Integral Boundary Conditions
Peipei Ning,Qian Huan,Wei Ding
Abstract and Applied Analysis , 2013, DOI: 10.1155/2013/134691
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