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Search Results: 1 - 10 of 131924 matches for " ZHANG Zhao "
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Solution and Type Curve Analysis of Fluid Flow Model for Fractal Reservoir  [PDF]
Yulong Zhao, Liehui Zhang
World Journal of Mechanics (WJM) , 2011, DOI: 10.4236/wjm.2011.15027
Abstract: Conventional pressure-transient models have been developed under the assumption of homogeneous reservoir. However, core, log and outcrop data indicate this assumption is not realistic in most cases. But in many cases, the homogeneous models are still applied to obtain an effective permeability corresponding to fictitious homogeneous reservoirs. This approach seems reasonable if the permeability variation is sufficiently small. In this paper, fractal dimension and fractal index are introduced into the seepage flow mechanism to establish the fluid flow models in fractal reservoir under three outer-boundary conditions. Exact dimensionless solutions are obtained by using the Laplace transformation assuming the well is producing at a constant rate. Combining the Stehfest’s inversion with the Vongvuthipornchai’s method, the new type curves are obtained. The sensitivities of the curve shape to fractal dimension (θ) and fractal index (d) are analyzed; the curves don’t change too much when θ is a constant and d change. For a closed reservoir, the up-curving has little to do with θ when d is a constant; but when θ is a constant, the slope of the up-curving section almost remains the same, only the pressure at the starting point decreases with the increase of d; and when d = 2 and θ = 0, the solutions and curves become those of the conventional reservoirs, the application of this solution has also been introduced at the end of this paper.
Animal bone growth experiment of rapid-growing rats in different stress environment and its mathematical model  [PDF]
Jun Zhang, Wenzhi Zhao
Journal of Biosciences and Medicines (JBM) , 2013, DOI: 10.4236/jbm.2013.12005

The aim of this study is to explore a way that quantify the qualitative equation of bone growth and remodeling which was based on the animal Experiment of rapid-growing Rats in Different Stress Environment. These results were proved to be of good stability and identification precision with the numerical method of inversion. It suggested that the growing coefficient and the threshold in function were variables changing with time and space. The idea and method used in the research of bone growth and remodeling adaptation in this paper also provided clue and reference to establish other models for living system.

Research on the Maturity Model of Conflict Management in Engineering Project  [PDF]
Wan Zhang, Hui Zhao
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.23002

Integrated Project Management Maturity proposed a new concept. It is “Project Conflict Management Maturity”. It established a new concept of maturity level, established an evaluation index system on Project Conflict Management Maturity and used the multi-level fuzzy comprehensive evaluation method combined with the Project Management Maturity model to construct the maturity model of Project Conflict Management. Then, through numerical examples, it evaluated the score of object, got the maturity level of conflict management of the study project, verified the feasibility of the model for solving Project Conflict Management, provided some bases for solving problems of Project Conflict Management and had a certain practical significance about this problem.

The Pricing of Convertible Bonds with a Call Provision  [PDF]
Bin Zhang, Dianli Zhao
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.46117
Abstract: This paper deals with the pricing of convertible bond with call provision based on the traditional B-S formula. By applying the principle of no arbitrage, the partial differential equation for the bond is established with identified boundary conditions, which solution results in the closed form of the pricing formula.
Co-Movement and Interaction Effects across the Monetary, Foreign Exchange and Stock Markets: Evidence from China  [PDF]
Xuejin Zhao, Han Zhang
Journal of Financial Risk Management (JFRM) , 2017, DOI: 10.4236/jfrm.2017.63018
Abstract: This paper investigates the issue of co-movement and interaction among the monetary, foreign exchange and stock markets by employing the data from China’s financial markets. Based on the ICA-EGARCH-M model, we explore the volatility spillover effects so as to illustrate the overall co-movements across financial markets. Furthermore, in order to observe the multi-market dynamic relationship variation process, we calculate the dynamic correlation coefficients with the AG-DCC-MGARCH model. Our findings provide both static and dynamic evidence on the co-movement and interaction effects of financial markets which may lead to the systemic financial risk.
An Analytical Overview of Kohlberg’s Theory of Moral Development in College Moral Education in Mainland China  [PDF]
Qian Zhang, Honghui Zhao
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.58012
Abstract: Kohlberg’s theory of moral cognitive development is temporarily the most influential theory in moral development psychology in the west and is still applied into practice and proved effective by moral theorists and educators all over the world. This paper takes this theory as the basis to analyze some problems existing in college moral education in China. It also suggests effective strategies to improve college moral education in China, i.e. Chinese colleges should reform the mode of moral education to increase students’ moral judgment competence, respect the developmental rules of moral cognition, make full use of the “Zone of proximal development” theory for moral education to develop students’ moral autonomy, attach great importance to “moral regression” period, and guide the Chinese moral education to transit from “teach how to obey” to “teach how to choose.”
Study on the Development of the Cultural Industry Projects under Urban and Rural Co-Ordination in Lixian County  [PDF]
Liyuan Zhang, Bing Zhao
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.61015
Since the reform and opening up, China has improved its comprehensive national strength and accelerated the process of urbanization. The important tasks that Lixian County currently facing are to develop cultural industry and promote urban and rural co-ordination. Lixian County is located in the core area of China Tibetan and Qiang culture corridor and has a large number of representative cultural resources and products. On the cultivation and hatching of a large number of the cultural industry development projects of regional characteristics and market competitiveness, scientific determination of the key development industries and fields and the development timing, vigorous support of a number of potential cultural enterprises and through the development of nine key projects, the cultural industry of the whole Lixian county should be driven.
Study on the Planning Strategy of Rural Renewal under the Guidance of Villagers’ Participation in Aba Prefecture  [PDF]
Meng Zhang, Bing Zhao
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.71007
Abstract: Rural revitalization is a policy introduced under the background of the integration of urban and rural development. With the government as the guide, the village-based ruling philosophy promotes rural development. In the development of this policy, the village has been further developed and adapted to the needs of the times. However, there are still a series of problems. The planning mode of the hard-working has made the participation of the villagers mostly in the form, which leads to the lack of support system and limited social development. Therefore, the formulation of villagers’ participation in rural construction is the cornerstone for rural development. In various aspects, the village name was adopted to participate in the rural construction planning strategy, in order to achieve rural renewal and prosperity.
University Flipped Class Model in China  [PDF]
Shuo Zhao, Xin Zhang
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.73043
Under the wave of information-based education reform in China, the flipped classroom originated from American educational circles, guided by constructivism and relying on modern information technology, as an innovative teaching mode, is attracting the attention and favor of our educational circles with its unique advantages. Guided by the reform of education, this paper conducted a research on the application of flipped classroom teaching mode in university teaching. In the half-year term teaching experiment, the teaching effect of this mode and the acceptability of students were mainly discussed through questionnaires and empirical research on final scores. The result shows that compared with conventional teaching, this model can significantly improve students’ learning effect, optimize the learning process, improve students’ learning attitude, and is recognized by the majority of students.
Correction to the Chiral Magnetic Effect from axial-vector interaction
Zhao Zhang
Physics , 2012, DOI: 10.1103/PhysRevD.85.114028
Abstract: The recent lattice calculation at finite axial chemical potential suggests that the induced current density of the chiral magnetic effect (CME) is somehow suppressed comparing with the standard analytical formula. We show in a NJL-type model of QCD that such a suppression is a natural result when considering the influence of the attractive axial-vector interaction. We point out that the lattice result doesn't need to be quantitatively consistent with the analytical formula due to the chirality density-density correlation. We also investigate the nonperturbative effect of instanton molecules on the CME. Since an unconventional repulsive axial-vector interaction is induced, the CME will be enhanced significantly by the instanton-anti-instanton pairings. Such a prediction needs to be tested by more improved lattice simulations. We further demonstrate that the axial-vector interaction plays an important role on the $T-\mu_A$ phase diagram.
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