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Search Results: 1 - 10 of 10638 matches for " Lisha Ding "
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Exact Finite Difference Scheme and Nonstandard Finite Difference Scheme for Burgers and Burgers-Fisher Equations
Lei Zhang,Lisha Wang,Xiaohua Ding
Journal of Applied Mathematics , 2014, DOI: 10.1155/2014/597926
Abstract: We present finite difference schemes for Burgers equation and Burgers-Fisher equation. A new version of exact finite difference scheme for Burgers equation and Burgers-Fisher equation is proposed using the solitary wave solution. Then nonstandard finite difference schemes are constructed to solve two equations. Numerical experiments are presented to verify the accuracy and efficiency of such NSFD schemes. 1. Introduction During the last few decades, nonlinear diffusion equation (1) has played an important role in nonlinear physics. Recently, it also began to become important in various other fields of science, for example, biology, chemistry, and economics [1–3]. When , (1) is reduced to the famous Burgers equation (2) This equation is the simplest equation combining both nonlinear propagation effects and diffusive effects [3]. It has been used in many fields especially for describing wave processes in acoustics and hydrodynamics [2]. Researchers have devoted a lot of efforts to studying the solutions of this equation [1–6]. A. van Niekerk and F. D. van Niekerk [4] applied Galerkin methods to the nonlinear Burgers equation and obtained implicit and explicit algorithms using different higher order rational basis functions. Hon and Mao [5] applied the multiquadric as a spatial approximation scheme for solving the nonlinear Burgers equation. Biazar and Aminikhah [6] considered the variational iteration method to solve nonlinear Burgers equation. If we take , (1) becomes the Burgers-Fisher equation (3) Burgers-Fisher equation is very important in fluid dynamic model. There have been extensive studies and applications of this model. A nonstandard finite difference scheme for the Burgers-Fisher equation was given by Mickens and Gumel [7]. In [8], Kaya and El-Sayed constructed a numerical simulation and explicit solutions of the generalized Burgers-Fisher equation. Ismail et al. [9] obtained the approximate solutions for the Burgers-Huxley and Burgers-Fisher equations by using the Adomian decomposition method. Wazwaz [10] presented the tanh method for generalized forms of nonlinear heat conduction and Burgers-Fisher equations. Javidi and Golbabai [11, 12] studied spectral collocation method and spectral domain decomposition method for the solution of the generalized Burgers-Fisher equation. Numerical solution of Burgers-Fisher equation is presented based on the cubic B-spline quasi-interpolation by Zhu and Kang [13]. Kocacoban et al. [14] solved Burgers-Fisher equation by using a different numerical approach that shows rather rapid convergence than other
Personal Financial Planning for College Graduates  [PDF]
Lisha Huang
Technology and Investment (TI) , 2016, DOI: 10.4236/ti.2016.73014
As graduation day approaches, many college students look forward to a time when they can pursue the great things that they desire independently. But young adults, who are inadequately equipped with the essential knowledge about personal finance, make many detrimental financial mistakes until they finally become smart and diligent financial planners. If college graduates have the correct knowledge and motivation about personal finance when starting out, they can get control of their finances by making wise decisions and avoiding common pitfalls. This essay starts with determining one’s personal financial goals in a realistic manner in order to set the plan. Then the essay goes on to recommend college graduates to make net worth statement in order to know the starting point of carrying out the plan. Additionally, the essay will delve into different aspects of carrying out the personal financial plan such as making a budget which serves to direct wise spending, managing credits which deals with smart borrowing, saving for the future which prepares graduates for emergencies and small extra funds and lastly, it will talk about smart investing which can bring about large wealth to college graduates who start out with little money. This essay will provide insightful information for college graduates to be financially successful.
Relationship between flagella-dependent motility and biofilm in bacteria - A review

Lisha Ding,Yao Wang,

微生物学报 , 2009,
Abstract: Abstract: Motility was considered to be closely related with biofilm formation positively for a long time because the ability of biofilm formation would be decreased in the motility-defective bacteria. Moreover, the results of defective mutants of flagella and some other regulated proteins suggested that the relationship between motility and biofilm was diverse in different bacteria. Factors other than motility could influence the development of biofilms as well. Namely, motility is not the only determining factor for biofilm formation. Here, we described bacterial biofilm and motility in detail and evaluated their correlation.
The flhDC gene affects motility and biofilm formation in Yersinia pseudotuberculosis
Yao Wang,LiSha Ding,YangBo Hu,Yong Zhang,BaoYu Yang,ShiYun Chen
Science China Life Sciences , 2007, DOI: 10.1007/s11427-007-0101-6
Abstract: The flagella master regulatory gene flhDC of Yersinia pseudotuberculosis serotype III (YPIII) was mutated by deleting the middle region and replaced by a tetracycline resistant gene, and the subsequent mutant strain named YPIIIΔflhDC was obtained. Swimming assay showed that the swimming motility of the mutant strain was completely abolished. The promoter region of the flagella second-class regulatory gene fliA was fused with the lux box, and was conjugated with the mutant and the parent strains respectively for the first cross. LUCY assay result demonstrated that flhDC regulated the expression of fliA in YPIII as reported in E. coli. Biofilm formation of the mutant strain on abiotic and biotic surfaces was observed and quantified. The results showed that mutation of flhDC decreased biofilm formation on both abiotic and biotic surfaces, and abated the infection on Caenorhabdtis elegans. Our results suggest that mutation of the flagella master regulatory gene flhDC not only abolished the swimming motility, but also affected biofilm formation of YPIII on different surfaces. The new function of flhDC identified in this study provides a novel viewpoint for the control of bacterial biofilm formation.
An Overview of Development of Higher Education Access in China
Lisha Liu
Higher Education Studies , 2012, DOI: 10.5539/hes.v2n2p107
Abstract: As a crucial component of higher education system, the models of student admissions differ worldwide due to diverse historical, traditional, and cultural factors. This paper presents a documentary study which seeks to identify some key developmental milestones of access to higher education in China. The paper begins with an outline history of the evolvement of admission system from the imperial era to the present. Subsequently, some reforms and issues of enrolment approaches at both undergraduate and postgraduate levels are discussed. Finally, the primary characteristics of the higher education enrolment system are proposed. Overall, this paper is expected to offer some insights into the development of current admission trends and an orientation on which Chinese policy-makers and educational administrators may wish to focus their efforts.
On a Personal Experience of Cultural Adaptation---From the Perspective of Microculture
Lisha Liu
Asian Social Science , 2010, DOI: 10.5539/ass.v6n9p168
Abstract: This paper, from the perspective of microculture, mainly explores how the cultural anthropological theory “cultural adaptation” works on a personal experience of a student who pursues her further study inter-regionally in the different provinces of China. Much more focus will be given on the main models the personal cultural adaptation has followed in the study. Different levels of personal cultural adaptation outcomes will also be discussed in the later part of this paper.
Exploration the Method of Low Dose Coronary Artery Imaging with Dual-Source CT  [PDF]
Zhiwei Huang, Bo Xiao, Lisha Zhong
Journal of Biosciences and Medicines (JBM) , 2013, DOI: 10.4236/jbm.2013.11002
Abstract: Objective: On the premise that the image quality meets the requirements of clinical diagnosis, we explored the methods to reduce the radiation dose of coronary artery imaging with Dual-Source CT (DSCT). Methods: We randomly selected 200 patients with coronary heat disease (BIM<25kg/m2), applied the scanning technology of regulating the dose of heart electric pulse (AUTO) on the 100 patients in group A. In this group for different heart rate we chose different full dose exposure time window. For the 100 patients in group B, we used conventional full dose (OFF) scan mode. The DSCT automatically selected the best time and phase to reconstruct the image. We used the 5 point system to evaluate the image quality, measured and compared the image noise and radiation dose. When P<0.05, the differences between the two groups have statistical significance. Results: The image quality scores between the two groups showed no significant difference (P > 0.05). The average image noise in group A is (41.76 ± 7.98) HU, in group B the average image noise is (43.97 ± 3.88) HU, the dif- ference between the two groups was not statistically significant (P>0.05). The average CTDIvol of group A and B were (20.63 ± 2.24) mGy, (38.11 ± 10.69) mGy, respectively, then P <0.01. The average DLP of group A and B are (235.75 ± 28.64) mGycm and (492.59 ± 125.49) mGycm respectively, then P <0.01, the dif- ference of radiation dose had statistical significance (P<0.05). Conclusions: For coronary artery imaging with DSCT the heart electric pulse (AUTO) regulation technology can meet the diagnostic requirements and effectively reduce the radiation dose.
Micro-Grid Smooth Switchover Method Based on Controller State Following  [PDF]
Yang Fu, Lisha Huang, Jingjing Zhao
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.34019

Micro-grid smooth switchover between different operation modes is important for steady operation and reliable power supply of micro-grid. In order to reduce the transient fluctuation of voltage and frequency during switchover, this paper proposed a new switchover method based on controller state following. When transferring to island mode, the control method for inverter of storage device changed from PQ control to V/f control. Before switchover, the output of V/f controller is always following the output of PQ controller. So that the sudden change of output is avoided at the moment of switchover. A micro-grid model with photovoltaic and battery is built on DIgSILENT Power Factory simulation software, to simulate micro-grid switchover from grid-connected mode to island mode. Results show this method can effectively suppress the transient fluctuation of voltage and frequency, and reduce the influence of transient process on power grid. This conclusion has important practical significance on micro-grid smooth switchover from grid-con- nected mode to island mode.

Arbuscular mycorrhizal fungi diversity in the rhizosphere of tea plant (Camellia sinensis)grown in Laoshan,Shandong

Lisha Wu,Yu Wang,Min Li,Zhaotang Ding,Runjin Liu,

生物多样性 , 2009,
Abstract: To determine the diversity of arbuscular mycorrhizal (AM) fungi in the rhizosphere of tea plant (Camellia sinensis) in Laoshan region, Shandong Province, we selected and sampled 12 representative tea gardens. Soil samples were collected from these gardens in September 2007. Spores of AM fungi were identified to reveal the species richness, frequency, spore density, relative abundance, importance value and Shannon-Wiener indices of AM fungi. Species diversity and composition of AM fungal community were also compared among the 12 tea gardens. A total of 22 species belonging to three genera were identified according to the morphological characteristics of the spores isolated from soil samples collected using wet-sieving techniques. The relative abundance of the genus Acaulospora was the highest, followed by Glomus. Soil samples from Xiaowang Village Tea Garden showed the highest spore density, while Gaojia Village soils were the lowest. Species richness in soil samples from Changjiacun Village and Sangyuan Village Tea Garden was significantly higher than that in other tea gardens. Species diversity was highest in the Changjiacun Village Tea Garden. Acaulospora laevis was the dominant species in Beilao Tea Garden, Wanglijiang Tea Garden, Yingshanchun Tea Garden, Wanlijiang Organic Tea Garden, Changjia Village, and Sangyuan Village Tea Garden, while Acaulospora undulata was the most common species in Gaojiacun Village and Wanlaike Tea Garden. Glomus occultum occurred most frequently in Yingshanchun Tea Garden, Xiaowang Village and Wanlaike Tea Garden. Relationships between environmental factors and AM fungi spore density in the Laoshan Tea region were determined using Canonical Correspondence Analysis, and their relative degree of impact on density was as follows: available phosphorus content>soil organic matter content>tree age>soil available nitrogen content > soil pH>soil available potassium content.
Recurrent Targeted Genes of Hepatitis B Virus in the Liver Cancer Genomes Identified by a Next-Generation Sequencing–Based Approach
Dong Ding,Xiaoyan Lou,Dasong Hua,Wei Yu,Lisha Li,Jun Wang,Feng Gao,Na Zhao,Guoping Ren,Lanjuan Li ,Biaoyang Lin
PLOS Genetics , 2012, DOI: 10.1371/journal.pgen.1003065
Abstract: Integration of the viral DNA into host chromosomes was found in most of the hepatitis B virus (HBV)–related hepatocellular carcinomas (HCCs). Here we devised a massive anchored parallel sequencing (MAPS) method using next-generation sequencing to isolate and sequence HBV integrants. Applying MAPS to 40 pairs of HBV–related HCC tissues (cancer and adjacent tissues), we identified 296 HBV integration events corresponding to 286 unique integration sites (UISs) with precise HBV–Human DNA junctions. HBV integration favored chromosome 17 and preferentially integrated into human transcript units. HBV targeted genes were enriched in GO terms: cAMP metabolic processes, T cell differentiation and activation, TGF beta receptor pathway, ncRNA catabolic process, and dsRNA fragmentation and cellular response to dsRNA. The HBV targeted genes include 7 genes (PTPRJ, CNTN6, IL12B, MYOM1, FNDC3B, LRFN2, FN1) containing IPR003961 (Fibronectin, type III domain), 7 genes (NRG3, MASP2, NELL1, LRP1B, ADAM21, NRXN1, FN1) containing IPR013032 (EGF-like region, conserved site), and three genes (PDE7A, PDE4B, PDE11A) containing IPR002073 (3′, 5′-cyclic-nucleotide phosphodiesterase). Enriched pathways include hsa04512 (ECM-receptor interaction), hsa04510 (Focal adhesion), and hsa04012 (ErbB signaling pathway). Fewer integration events were found in cancers compared to cancer-adjacent tissues, suggesting a clonal expansion model in HCC development. Finally, we identified 8 genes that were recurrent target genes by HBV integration including fibronectin 1 (FN1) and telomerase reverse transcriptase (TERT1), two known recurrent target genes, and additional novel target genes such as SMAD family member 5 (SMAD5), phosphatase and actin regulator 4 (PHACTR4), and RNA binding protein fox-1 homolog (C. elegans) 1 (RBFOX1). Integrating analysis with recently published whole-genome sequencing analysis, we identified 14 additional recurrent HBV target genes, greatly expanding the HBV recurrent target list. This global survey of HBV integration events, together with recently published whole-genome sequencing analyses, furthered our understanding of the HBV–related HCC.
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