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INFLUENCE OF AGING ON SERRATED FLOW OF ALUMINUM ALLOY LC9

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Acta Metallurgica Sinica(English Letters) 1992年第2期5卷 101-106页

作者： WU Min XU Yuehuang SHEN Gongtian wuhan university,wuhan,china wuhan Univ Wuhan China

The serratedflow of alloy LC9 with different regimes of heat treatment has been investigated at constant rate of *** critieal strain ε_c at the starting of serrated flow increases with the extension of *** activation energy of the process is 0.6. e V which is consistent with the diffusion activation energy of vacancies in *** ε_c decreases while the strain rate ε increases,i.e.,with negative strain rate *** relation is contrary to that of the an- nealed *** shows that the serrated 17ow of annealed sample is controlled by deformation vaeancies,and that of aged sample is controlled by quenching *** den- sity and shape of the serration are changed by *** mechanism of the above mentioned results is discussed.

关键词： serratedflow Cottrell atmosphere aging pinning and depinning

Large deviation principles for stationary NA sequences

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Chinese Science Bulletin 1998年第7期43卷 536-540页

作者： HU Yijun Department of Mathematics, wuhan university, wuhan 430072, china Department of Mathematics Wuhan University Wuhan China

Under general conditions, the large deviation principles for partial sums of stationary NA sequences are proved.

关键词： NA sequence stationary sequence partial sums large deviation principle.

Differentiation of Natural and Irradiated Blue Topaz by Cathodoluminescence(CL) Properties

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地学前缘 2009年第S1期16卷 169-170页

作者： Ying Song~(1,2),Xinqiang Yuan~2 1.Faculty of Earth Resources,china university of geosciences(wuhan),wuhan 43.074,china. 2.Gemmological Institute,china university of geosciences(wuhan),wuhan 43.074,china

Blue colored topaz is one of the most recognized gemstones ***,it is rarely found in the field and the products have been made mostly in laboratory using gamma,neutron and electron irradiation or combinations of these *** of the blue color in topaz remains not well understood, largely due to a lack of nondestructive way in idnetifying the blue *** we report a compari-

关键词： cathodoluminescence natural blue topaz irradiated blue topaz

A RAISED PANEL METHOD BASED ON NURBS FOR FREE-SURFACE POTENTIAL FLOWS WITH FORWARD SPEED

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Journal of Hydrodynamics 2003年第2期15卷 112-120页

作者： Gao Gao, Ma LingSchool of Transportion, wuhan university of Technology, wuhan 43006., china School of Transportion Wuhan University of Technology Wuhan 430063 China

A raised panel method based on NURBS (Non-Uniform Rational B-Splines) forfree-surface flows with forward speed is presented. In this generalized panel method, NURBS areemployed to represent the body geometry, disturbed free surface, and to express the unknown sourcestrength distribution, on the body surface and above the free surface. Compared with commonhigher-order panel methods, it has no need of adopting local coordinates. NURBS make the geometryrepresentation of the body shape and the wave pattern more precise. Raised panels above the freesurface produce less numerical dispersion error, need less CPU consumption and are helpful andcombined with collocation-point shifting up-stream, can satisfy the radiation condition *** using continuous and discrete Fourier analysis, numerical errors of this method are discussedand a general expression for the errors of numerical damping and dispersion, including the effectsof the vertical distance of singularities to the free surface, the order of singularity distributionrepresented by B-splines in panels, and collocation-point shifting is derived.

关键词： NURBS free-surface flow raised panel method error analysis B-spline

Sol-gel Preparation Copper-cadmium Halide DopedPhotochromic Glass Coating on Plate Glass

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International Journal of Minerals,Metallurgy and Materials 2000年第1期14卷 34-37页

作者： ShiyongLuo Jiayun Zhang Jixiang Liu Metallurgy School, university of Science and Technology Beijing, Beijing 100083, china wuhan university of Technology, wuhan 430070, china Univ Sci & Technol Beijing Met Sch Beijing 100083 Peoples R China wuhan Univ Technol Wuhan 430070 Peoples R China

Copper-cadmium halide doped photochromic glass coating on plate glass has been prepared by a sol-gel process. The sample shows reversible photochromic effect. The results of X-ray diffraction (XRD) and infrared (IR) spectrum investigations indicate that the photochromic phase of tile coating is CuBr_xCl_(1-x), solid solution, and that the structure network of the coating is connected with the bonds of Si-O-Si, Si-O-B and Si-O-Al.

关键词： photochromic glass coating sol-gel photochromic phase, structure network

Permian carbonates of Baoshan block, Western Yunnan and their paleoclimatic implications

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Science china Earth Sciences 2004年第5期47卷 385-392页

作者： YAN Jiaxin1, LIANG Dingyi1 & WU Ming2 1. Faculty of Earth Sciences, china university of geosciences, wuhan 43.074, china 2. College of Chemistry and Life Sciences, South-Central university for Nationalities, wuhan 43.074, china china Univ Geosci Fac Earth Sci Wuhan 430074 Peoples R China S Cent Univ National Coll Chem & Life Sci Wuhan 430074 Peoples R China

Recently, much attention has been paid to the climatic significance of carbonates originating in shallow water. Permian carbonates of shallow shelf origin are present in the upper part of the Dingjiazhai Formation, the upper part of the Yongde Formation, and the Shazipo Formation on the Baoshan block of Western Yunnan. Their skeleton and non-skeleton grain as-sociations have been investigated in this study. The carbonates of the Dingjiazhai Formation indicate a Bryonoderm (bryozoans-echinoderm) association without non-skeleton grains. The carbonates of Yongde and Shazipo formations show Chloroforam (green algae-foraminifers) association with peloids. Oolites develop in the Shazipo Formation. Based on the comparisons of grain association with coeval carbonates formed in different paleolatitudes (i.e. various paleo-climatic zones), the carbonates of the Dingjiazhai Formation were thought to have been accu-mulated in shelf environments of warm-temperate zone, and those of the Yongde and Shazipo formations in shelf environments of warm-water.

关键词： Early Permian, carbonate, paleoclimate, Western Yunnan.

Entropy-Based Approach to Remove Redundant Monitoring Wells from Regional-Scale Groundwater Network

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Journal of china university of geosciences 2002年第3期13卷 266-273页

作者： Chen Zhihua Engineering Faculty, china university of geosciences, wuhan 43.074 Jing Juanli Graduate School, china university of geosciences, wuhan 43.074 Chen Gang Engineering Faculty, china university of geosciences, wuhan 43.074 Engineering Faculty China University of Geosciences Wuhan 430074 Graduate School China University of Geosciences Wuhan 430074

An entropy-based approach is applied to identify redundant wells in thenetwork. In the process of this research, groundwater-monitoring network is considered as acommunication system with a capability to transfer information, and monitoring wells are taken asinformation receivers. The concepts of entropy and mutual information are then applied to measurethe information content of individual monitoring well and information relationship betweenmonitoring well pairs. The efficiency of information transfer among monitoring wells is the basis tojudge the redundancy in the network. And the capacity of the monitoring wells to provideinformation on groundwater is the point of evaluation to identify redundant monitoring wells. Thisapproach is demonstrated using the data from a regional-scale ground-water network in Hebei plain,china The result shows that the entropy-based method is recommendable in optimizing groundwaternetworks, especially for those within media of higher heterogeneities and ani-sotropies.

关键词： entropy groundwater monitoring network optimize redundant

DOUBLE Φ-FUNCTION INEQUALITY FOR NONNEGATIVE SUBMARTINGALES

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Chinese Annals of Mathematics,Series B 2000年第2期21卷 211-216页

作者： MEI TAO(College of Mathematics and Computer Sciences, wuhan university, wuhan 430072, china.) LIU PEIDE(College of Mathematics and Computer Sciences, wuhan university, wuhan 430072, china.) College of Mathematics and Computer Sciences Wuhan University Wuhan 430072 China

The authors establish a kind of inequalities for nonnegative submartingales which depend on two functions　ψ and ψ, and obtain the equivalent conditions for　Φ and ψ such that this kind of inequalities holds. In t... 详细信息

关键词： Matingale Nonnegative submartingale Maximal function Φ-function inequality

Tectonic-Hydrocarbon Accumulation Analysis of Laoyemiao Region in Nanpu Sag,Bohai Bay Basin

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地学前缘 2009年第S1期16卷 154-155页

作者： Cuimei Zhang,Xiaofeng Liu,Jianye Ren Faculty of Earth Resources,china university of geosciences(wuhan),wuhan 43.074,china.

Nanpu sag lies in the northwest part of the Bohai bay *** structural zone is located in the northwest part of the sag,to the north bound by basin-bounding master fault-Xi’nanzhuang fault (XNZF).This paper aims to gai... 详细信息

关键词： tectonic-hydrocarbon accumulation analysis Laoyemiao region Nanpu sag