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Search Results: 1 - 10 of 31595 matches for " Zhan Wen "
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Sedimentary Environment of the Early Ordovician in Danzhai, Guizhou  [PDF]
Yu Pei, Youbin He, Jinxiong Luo, Yantao Zeng, Zhan Wen
Open Journal of Yangtze Oil and Gas (OJOGas) , 2017, DOI: 10.4236/ojogas.2017.23009
Abstract: This study analyzes the variations in trace element contents and ratios, the distribution patterns of rare earth elements, and the sedimentary environment and its evolution in the Early Ordovician. In particular, the analysis is based on measured section of the Qingjiang Village located in Nangao Town, Danzhai County, Guizhou Province. The analysis also considers thin sections and the characteristics of C, O isotopes. The lower part of the Tongzi Formation has a simple lithology and mainly consists of light gray to gray thin-medium bedded muddy dolomite and dolomicrite with a few dolarenites and dolorudites. The upper part of this formation includes gray thin-medium bedded fine crystalline dolomite and gray massive bioclastic limestone. Only a fraction of gray massive fine crystalline limestone, sparry calcarenite, and calcirudite are on top of the upper part. The Honghuayuan Formation is generally composed of light gray to gray medium-thick bedded or massive bioclastic limestone, reef limestone, and calcarenite with a few sandstones at the bottom. The δ18OPDB values of 18 samples are less than -11‰; in addition, the Pr/Pr* and Ce/Ce* ratios are greater and less than 1, respectively. These data reflect a sedimentary environment. The lower part of the Tongzi Formation might have been formed in an evaporite platform, which was then transformed into a restricted one, which featured a dry climate, a shallow water depth, and an insufficient amount of oxygen. By contrast, the upper part of the formation was deposited in an open platform, which featured a humid climate and relatively increased water depth and reducibility. During the sedimentary period of the Honghuayuan Formation, the water energy further increased, the climate became humid, the water depth increased, and the reducibility increased. Correspondingly, the sedimentary environment, which originally comprised littoral facies that slowly developed into an open platform and into a platform marginal bank, gradually evolved into a platform marginal reef.
Minimum-Maximum Method of Refining the Subgame Perfect Nash-equilibrium on the Out-of-Equilibrium Path
子博弈精炼纳什均衡非均衡路径极小极大化精炼法

DING Zhan,|wen,
丁占文

系统工程理论与实践 , 2001,
Abstract: Minimum\|maximum criterion of equilibrium refining is given. Subgame perfect Nash\|equilibrium is further refined on the out\|of\|equilibrium path by the criterion.
Non-Walrasian Equilibrium Cobwed Model of
多产品市场非瓦尔拉斯均衡蛛网模型

DING Zhan,wen,
丁占文

系统工程理论与实践 , 2001,
Abstract: The one market non Walrasian equilibrium cobweb model is generalized to the case of n market. In the generalized model, the influence of the prices on each other is considered. The result shows that in the n market case the equilibrium is still non Walrasian, and moreover, the problem of market structure araises.
Adaptively Active Contours Based on Variable Exponent Norm for Image Segmentation
Wenying Wen,Chuanjiang He,Meng Li,Yi Zhan
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/490879
Abstract: We propose an (|?|)-based adaptively active contours model for image segmentation which is derived from the well-known Chan-Vese (C-V) model. Unlike the C-V model, the proposed model uses the (|?|)((|?|)>2) norm instead of the 2 norm to define the external energy and incorporates an extra internal energy into the overall energy. Due to the variable exponent (|?|)  which could fit the image gradient information adaptively, the proposed (|?|)-based model has the hope of segmenting those images with low contrast and blurred boundaries. Experimental results show that the proposed model with (|?|)>2 really can effectively and quickly segment those images with low contrast and blurred boundaries.
Multi-objective Decision-Making for Site Selecting of Projects and Its Application
多项目多位置优化配对决策方法及应用

DAI Wen-zhan,
戴文战

系统工程理论与实践 , 2004,
Abstract: An effective function fit for application to site selecting of projects has been put forward. The function emphasizes on the principle of ``rewarding good and punishing bad". Based on this function, a model for multi-objective decision-making method for site selecting of projects is also proposed. It introduces the principle of the method and summarizes the general steps of using the method. Finally, the proposed method is illustrated by a practical example and is shown to be more effective .
GM(1,1) Model Based on Power Function x-a Transformation and Its Application in Chinese Country Per-capita Housing Areas Modeling
基于函数$x^{-a}$变换的GM(1,1)模型及在我国农村人均住房面积建模中的应用

DAI Wen-zhan~,
戴文战

系统工程理论与实践 , 2004,
Abstract: In this paper, the method of power function x~(-a)(a>0) transformation against modeling data is put forward. It has been proved that the smooth degree of discrete data after this transformation can be enhanced. Moreover, the GM(1,1) model precision based on the data transformation is better than the model precision based on logarithm function transformation. So the method can widen range of application of grey model. At last, the model of Chinese country per-capita housing areas is built by means of the method. The practical application shows the effectiveness of the proposed approach.
PHASE TRANSITION IN A NONEQUILIBRIUM POTTS MODEL WITH COMPETING DYNAMICS: A MONTE-CARLO STUDY

GUO WEN-AN,YANG ZHAN-RU,

中国物理 B , 1997,
Abstract:
Determination of the Neutrino Mass Hierarchy at an Intermediate Baseline
Zhan, Liang;Wang, Yifang;Cao, Jun;Wen, Liangjian
High Energy Physics - Phenomenology , 2008, DOI: 10.1103/PhysRevD.78.111103
Abstract: It is generally believed that neutrino mass hierarchy can be determined at a long baseline experiment, often using accelerator neutrino beams. Reactor neutrino experiments at an intermediate baseline have the capability to distinguish normal or inverted hierarchy. Recently it has been demonstrated that the mass hierarchy could possibly be identified using Fourier transform to the L/E spectrum if the mixing angle $\sin^2(2\theta_{13})>0.02$. In this study a more sensitive Fourier analysis is introduced. We found that an ideal detector at an intermediate baseline ($\sim 60$ km) could identify the mass hierarchy for a mixing angle $\sin^2(2\theta_{13}) > 0.005$, without requirements on accurate information of reactor neutrino spectra and the value of $\Delta m^2_{32}$.
A Quantum Spin Hall Round Disk as a Spin Rotator and Filter
Zhan-Feng Jiang,Wen-Yu Shan
Physics , 2009,
Abstract: We study theoretically the spin transport of a Quantum Spin Hall round disk. When an electron traverses the disk in virtue of the edge states, its spin's in-plane component can be rotated by a magnetic flux through the disk. The spin rotation occurs due to the interference of two helical edge states with opposite spins, which is regarded as the Aharonov-Bohm effect in the spin space and a manifestation of the Berry phase. Besides, the disk has a spin filter effect on the tunneling current when we apply an appropriate magnetic field and gate voltage on it. The spin polarization ratio can reach 100% when the couplings between the disk and leads are weak.
Determination of the Neutrino Mass Hierarchy at an Intermediate Baseline
Liang Zhan,Yifang Wang,Jun Cao,Liangjian Wen
Physics , 2008, DOI: 10.1103/PhysRevD.78.111103
Abstract: It is generally believed that neutrino mass hierarchy can be determined at a long baseline experiment, often using accelerator neutrino beams. Reactor neutrino experiments at an intermediate baseline have the capability to distinguish normal or inverted hierarchy. Recently it has been demonstrated that the mass hierarchy could possibly be identified using Fourier transform to the L/E spectrum if the mixing angle $\sin^2(2\theta_{13})>0.02$. In this study a more sensitive Fourier analysis is introduced. We found that an ideal detector at an intermediate baseline ($\sim 60$ km) could identify the mass hierarchy for a mixing angle $\sin^2(2\theta_{13}) > 0.005$, without requirements on accurate information of reactor neutrino spectra and the value of $\Delta m^2_{32}$.
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