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Search Results: 1 - 10 of 64319 matches for " Ge Yang "
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The Property of a Special Type of Exponential Spline Function  [PDF]
Ge Yang
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.513074
Abstract: Approximation theory experienced a long term history. Since 50’ last century, the rise of spline function as well as the advance of calculation promotes the growth of classical approximation theory and makes them develop a profound theory in maths, and application values have shown among the field of scientific calculation and engineering technology and etc. At present, the study of spline function had made a great progress and had a lot of fruits, as for that, the reader could look up the book [1] or [2]. Nevertheless, the research staff pays less attention to exponential spline function, since polynomial spline function is a special case of that, so it is much essential and meaningful for one to explore the nature of exponential spline function.
Developing Human Capital Capabilities of Top Management Team for CoPS Innovation  [PDF]
Yuhui GE, Weizhong YANG
Journal of Service Science and Management (JSSM) , 2009, DOI: 10.4236/jssm.2009.23027
Abstract: Top management team (TMT) play key roles in many industries and firms. Human resources is continuously developed and considered to be a competitive advantage. Traditional research on TMT has, however, paid scant attention to the human capital capabilities of TMT needed for firms. Furthermore, traditional work on TMT of firms pays limited attention to its specific traits in complex products and systems (CoPS) innovation. In the present paper, we explore the development of human capabilities of TMT observed in CoPS innovation firms. We developed a model for analysis the human capital capabilities of TMT for CoPS Innovation, and suggested that a dynamic interplay between the development of human capital capabilities of TMT and the changing CoPS innovation environment, and human capital capabilities of TMT for CoPS innovation could be developed through team learning. And we formulated an empirical research framework for the analysis of factors affecting the human capital capabilities of TMT for CoPS innovation. Four key factors were identified and extracted by using factor analysis, and these resulting factors were related to the performance of CoPS innovation by using a multiple regression analysis method. The proposed framework identified four blocks of human capital capabilities of TMT for CoPS innovation, namely technology innovation management, risk management, organization management and relationship network management. The paper argues that TMT for CoPS innovation firms are only able to effectively harness and develop their human capital capabilities by team learning and integrating these four building blocks within the team.
Nontrivial Solution of Fractional Differential System Involving Riemann-Stieltjes Integral Condition
Ge-Feng Yang
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/719192
Abstract:
Positive Solutions for Boundary Value Problems of N-Dimension Nonlinear Fractional Differential System
Aijun Yang,Weigao Ge
Boundary Value Problems , 2009, DOI: 10.1155/2008/437453
Abstract: We study the boundary value problem for a kind N-dimension nonlinear fractional differential system with the nonlinear terms involved in the fractional derivative explicitly. The fractional differential operator here is the standard Riemann-Liouville differentiation. By means of fixed point theorems, the existence and multiplicity results of positive solutions are received. Furthermore, two examples given here illustrate that the results are almost sharp.
Positive Solutions for Boundary Value Problems of -Dimension Nonlinear Fractional Differential System
Yang Aijun,Ge Weigao
Boundary Value Problems , 2008,
Abstract: We study the boundary value problem for a kind -dimension nonlinear fractional differential system with the nonlinear terms involved in the fractional derivative explicitly. The fractional differential operator here is the standard Riemann-Liouville differentiation. By means of fixed point theorems, the existence and multiplicity results of positive solutions are received. Furthermore, two examples given here illustrate that the results are almost sharp.
Nontrivial Solution of Fractional Differential System Involving Riemann-Stieltjes Integral Condition
Ge-Feng Yang
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/719192
Abstract: We study the existence and uniqueness of nontrivial solutions for a class of fractional differential system involving the Riemann-Stieltjes integral condition, by using the Leray-Schauder nonlinear alternative and the Banach contraction mapping principle, some sufficient conditions of the existence and uniqueness of a nontrivial solution of a system are obtained. 1. Introduction HIV is a retrovirus that targets the CD4+ T lymphocytes, which are the most abundant white blood cells of the immune system. To this day, there have already been over 16 million people who died of AIDS. Although HIV infects other cells also, it wreaks the most havoc on the CD4+ T cells by causing their decline and destruction, thus decreasing the resistance of the immune system [1–3]. Mathematical models have been proven valuable in understanding the dynamics of HIV infection [4–6]. Perelson et al. [7, 8] developed a simple model for the primary infection with HIV. In this model, four categories of cells were defined: uninfected CD4+ T cells, latently infected CD4+ T cells, productively infected CD4+ T cells, and virus population. And the following two equations describe the evolution of the system: where all parameters and variables are nonnegative. is the assumed constant rate of the production of CD4+ T-cells, is their per capita death rate, is the rate of infection of CD4+ T-cells by virus, and is the rate of disappearance of infected cells. Recently Arafa1 et al. introduced fractional order into a model of infection of CD4+ T cells. The new system is described by the following set of FODEs of order : , and denote the concentration of uninfected CD4+ T cells, infected CD4+ T cells, and free HIV virus particles in the blood, respectively. represents death rate of infected T cells and includes the possibility of death by the bursting of infected T cells, hence . The parameter is the rate at which infected cells return to uninfected class while is the death rate of virus and is the average number of viral particles produced by an infected cell. Motivated by HIV model, in this paper, we consider the existence of nontrivial solution for fractional differential system where is a parameter, , , is the standard Riemann-Liouville derivative. denotes the Riemann-Stieltjes integral, and are functions of bounded variation. In the recent years, there has been a significant development in fractional order differential equations involving fractional derivatives. For example, Ahmad and Nieto [9] considered a coupled system of nonlinear fractional differential equations with three-point
1/4-Pinched Contact Sphere Theorem
Jian Ge,Yang Huang
Mathematics , 2013,
Abstract: Given a closed contact 3-manifold with a compatible Riemannian metric, we show that if the sectional curvature is 1/4-pinched, then the contact structure is universally tight. This result improves the Contact Sphere Theorem in [EKM12], where a 4/9-pinching constant was imposed. Some tightness results on positively curved contact open 3-manifold are also discussed.
Axiomatic Quantification of Co-authors' Relative Contributions
Ge Wang,Jiansheng Yang
Computer Science , 2010,
Abstract: Over the past decades, the competition for academic resources has gradually intensified, and worsened with the current financial crisis. To optimize the resource allocation, individualized assessment of research results is being actively studied but the current indices, such as the number of papers, the number of citations, the h-factor and its variants have limitations, especially their inability of determining co-authors' credit shares fairly. Here we establish an axiomatic system and quantify co-authors' relative contributions. Our methodology avoids subjective assignment of co-authors' credits using the inflated, fractional or harmonic methods, and provides a quantitative tool for scientific management such as funding and tenure decisions.
Net Nitrogen Mineralization in Natural Ecosystems across the Conterminous US  [PDF]
LeeAnna Y. Chapman, Steven G. McNulty, Ge Sun, Yang Zhang
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.49125
Abstract:

Nitrogen is the primary nutrient limiting ecosystem productivity over most of the US. Although soil nitrogen content is important, knowledge about its spatial extent at the continental scale is limited. The objective of this study was to estimate net nitrogen mineralization for the conterminous US (CONUS) using an empirical modeling approach by scaling up site level measurements. Net nitrogen mineralization and total soil nitrogen data across the CONUS were obtained from three different ecosystems: low elevation forests, high elevation forests, and grasslands. Equations to predict net nitrogen mineralization were developed through stepwise linear regression using total Kjeldahl nitrogen, air temperature, precipitation, and nitrogen deposition as predictor variables for four categories: low elevation high temperature forests (coefficient of determination, R2 = 0.83), low elevation low temperature forests (R2 = 0.74), high elevation forests (R2 = 0.80), and grasslands (R2 = 0.88). A map of net nitrogen mineralization was developed in GIS using these equations and national-scale databases for the CONUS. The result shows that net nitrogen mineralization varies widely across the US. Grasslands were predicted to have the lowest net nitrogen mineralization, while low elevation forests in the east had the highest. Mean values were 14.3 kg·ha-1

Synthesis and X-Ray Structure of New Anticancer Nucleosides Based on 1-((2-Hydroxyethoxy)methyl)-5-(phenylthio)-1H-1,2,4-triazole-3-carboxamide  [PDF]
Yulong Lei, Dehua Zhang, Yang Liu, Guanghui Tian, Hongguang Ge
Journal of Crystallization Process and Technology (JCPT) , 2014, DOI: 10.4236/jcpt.2014.43017
Abstract:
A pair of new anticancer nucleosides based on 1,2,4-triazole nucleosides and 1-((2-hydroxyethoxy) methyl)-5-(phenylthio)-1H-1,2,4-triazole-3-carboxamide have been synthesized, and have given the corresponding products in excellent yields. Its structures and conformations were confirmed by single crystal X-ray diffraction.
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