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NUMERICAL　SOLUTION　FOR　UNSTEADY　2－D　FLOW　USING　THE　TRANSFORMED　SHALLOW　WATER　EQUATIONS

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Journal of Hydrodynamics 1995年第3期7卷 65-71页

作者： Wei Wen-li(xi’an university of technology, xi’an 710048, P. R. China)Jin Zhong-qing(Hohai university, Nanjing 210024, P. R. China)

This paper is concerned with the numerical solution of two-dimensional *** technique of boundary-fitted coordinate systems is used to overcome the difficulties resulting from the complicated shape of natural river boundaries; the method of fractional steps is used to solve the partial differential equations in the transformed plane; and the technique of moving boundary is used to deal with the river bed exposed to water surface. Comparison between computed and experimental data shows a satisfactory agreement.

关键词： boundary-fitted coordinate systems,orthogonal curvilinear meshes technique

The Moderate Scale and Employment Problem of Chinese Construction Industry

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Science Foundation in China 2002年第1期10卷 43-45,57页

作者： Jin Weixing Lu xinhong(xi’an university of Architecture & technology, xi’an 710055)

We carry out a correlative analysis of the characteristics of production factors and their influences on the production capacity in construction industry. Useful information to define the moderate scale for Chinese construction industry is acquired. Three reasonable suggestions to improve its employment status and to accomplish the industrial civilization are offered.

关键词： construction industry moderate scale industrial civilization

High temperature tensile properties and fracture behavior of cast nickel-base K445 superalloy

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Progress in Natural Science:Materials International 2011年第5期21卷 418-425页

作者： Gong-xian YANG~(1,2),Yong-feng XU~2,Lei JIANG~2,Shu-hua LIANG~1 1.School of Materials Science and Engineering,xi'an university of technology,xi'an 710048,China 2.Dongfang Turbine Co.,Ltd,Deyang 618000,China School of Materials Science and Engineering Xi''an University of Technology Xi''an 710048 China Dongfang Turbine Co. Ltd Deyang 618000 China

The tensile properties and fracture behavior of a cast nickel-base superalloy K445 in the temperature range of 25-1 000℃were *** microstructure and fracture surfaces of the alloy were investigated by OM,SEM and *** results revealed that an anomalous yield strength phenomenon exists in the alloy at medium high *** yield strength decreases gradually with the increase of temperature,reaches the minimum value at 650℃,and then increases again to obtain 940 MPa,which is almost the same as that at 400℃.While the ultimate fracture strength attains the maximum value at 750℃,the yield strength and fracture strength decrease *** elongation and fracture shortage almost keep increasing trend with the increase of testing temperature,except the little drop at 400℃and 900℃.The fracture surface of K445 alloy below 400℃exhibits most cleavage characteristic with some *** the increase of temperature,the ductile feature increases,but the cleavage still dominates the fracture till 650℃.Therefore,it can be concluded that the secondary hardening effect results in the high yield strength and fracture strength with better ductility,which makes it more appropriate to be used at medium high temperature.

关键词： nickel-based K445 superalloy anomalous yield strength tensile properties fracture surface

BAINITIC TRANSFOR MATION IN AUSTEM PERED DUCTILE IRON

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Acta Metallurgica Sinica(English Letters) 1999年第4期12卷 447-451页

作者： Z.K. Fan and S.H. Liang Schoolof Materials Science and Engineering, xi’an university of technology ,xi’an 710048 ,China

Bainitictransformation processesin austempered ductile iron( ADI) have been discussed at presentstudy. Typicalupper bainitictransformation isconsidered as austenitetransformstobainiticferritediffussionless. When austemperingtimeisextended afterbainitictransforma tion hasceased, carbide will appear in bainitic ferritelaths. During typicallower bainitictransformation ,thefreshlyformed bainiticferriteonlypartitionssomeofitsexcesscarbonin toresidualaustenite, mostofthe restcarbon inthefreshly formed bainiticferriteisprecipi tatedin form ofcarbideatsametime. When austemperingtimeisextended,morecarbideis precipitatedin bainitic ferrite platelets. Carbide also appears atthe austenite/ferriteinter facesbecauseof retained austenite decomposition.

关键词： bainitictransformation austempered ductileiron carbide

Interactive Decision Support Algorithm and Its Application

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Journal of Systems Science and Systems Engineering 2001年第4期13卷 475-480页

作者： HONG xiao-kang, LIU Jian-lin, xiE Jian-cang, LIU Fu-chao, MA Bin xi’an university of technology, xi’an 710048, China xi'an university of technology Xi'an 710048 China

On the bases of the properties of abstract hierarchical structure model and the concrete structure of the mode1 system. which is convenient to solve practical problems, a visual interactive hierarchical coordination method has been proposed. In this paper, a compensation adjustment sub-mode1 for hydropower stations, an optimal operation sub-model for hydro-thermal power systems, and an aggregation model based on the aspiration level theory are built, and these models can be solved with decision support algorithm. The set of objectives and its structure could be made by the decision-maker in visua1 software, which could be decided by AHP. Finally, the application results show that this methodology is feasible, however, the software (DSS) needs further improvement.

关键词： interactive decision support a1gorithm mu1ti-objective and multi-mode1 structurel hydro- thermal power system scheme of power production

Significance of intensive glycemic control on early diabetic nephropathy patients with microalbuminuria

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Journal of Pharmaceutical Analysis 2010年第2期22卷 135-138页

作者： Wan-Hong Lu1,Bing-Yin Shi1,xiao-Tian Zhang2,Dan-Guo Wei3,Wei-Dong Liu4,Pei-Zhen Duan51. the First Affiliated Hospital,Medical School of xi’an Jiaotong university,xi’an 710061 2. Department of Human Anatomy and Histology,Medical School of xi’an Jiaotong university,xi’an 710061 3. Health Center of Changqing Construction and Engineering Company,xi’an 710086 4. Hospital of xi’an university of Architecture and technology,xi’an 710055 5. Hospital of xi’an university of Posts and Telecommunications,xi’an 710061,China. First Affiliated Hospital Medical School of Xi'an Jiaotong University Xi'an 710061 China Department of Human Anatomy and Histology Medical School of Xi'an Jiaotong University Xi'an 710061 China Health Center of Changqing Construction and Engineering Company Xi'an 710086 China Hospital of xi'an university of Architecture and technology Xi'an 710055 China Hospital of xi'an university of Posts and Telecommunications Xi'an 710061 China

Objective To investigate the therapeutic effect of intensive glycemic control on patients with early diabetic nephropathy. Methods A total of 41 type 2 diabetes patients who developed microalbuminuria were divided into two groups randomly. Patients in Group A received intensive glycemic control and the blood glucose in Group B was regularly controlled. Glycemic monitoring and control were followed for 12 weeks to observe the changes of microalbuminuria in both groups; meanwhile the levels of serum lipids and coagulation indices were also recorded. Results The urine albumin excretion rate (UAER) in Group A decreased significantly from (47.91±13.86)mg/24h to (35.31±14.56)mg/24h after 12 weeks (P0.05]. The decrease of triglyceride (TG) and low-density lipoprotein cholesterol (LDL cholesterol),and the increase of high-density lipoprotein cholesterol (HDL cholesterol) showed no significant differences (P>0.05). And the level of plasma fibrinogen (FIB) showed no significant decrease after 12 weeks,either (P>0.05). Conclusion Intensive glycemic control reduces the level of microalbuminuria and may ameliorate the progression of early diabetic nephropathy.

关键词： glycemic control diabetic nephropathy (DN) microalbuminuria

THE RESEARCH ON THE INFLUENCE OF NATIVE LANGUAGE TO THE PROCESS OF INTERLANGUAGE IN SLA & DEALING STRATEGIES

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Chinese Journal of Applied Linguistics 2005年第2期28卷 101-107,127页

作者：唐希成都理工大学外国语学院

Through the research of modern linguistics, the difference of language determines that the interlanguage is an expression in the learning process from native language to target language during second language acquisition ( SLA ). Based on the above view, the author of the paper attempts to make a study from the point of interlanguage and the influences of L1 transfer in the process of SLA. They point out and analyses the difficulties faced by L2 learners. Meanwhile, the L2 teacher should adopt the dealing strategies in classroom English teaching.

关键词：中介语二语习得母语迁移目的语策略研究表现形式语言学研究认识基础正迁移负迁移

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PPP项目范式选择与风险分配的关系研究

土木工程学报 2011年第9期44卷 139-146页

作者：胡振刘华金维兴西安建筑科技大学陕西西安710055

基于15个案例,分析PPP项目三种范式选择方案与风险分配之间的相关关系,结果发现:一部分项目风险的分配方案与范式选择无关,这类风险的主要特征是产生主体明确且能够防范,风险事件的发生直接针对PPP项目;另一部分项目风险分配方案与范式... 详细信息

基于15个案例,分析PPP项目三种范式选择方案与风险分配之间的相关关系,结果发现:一部分项目风险的分配方案与范式选择无关,这类风险的主要特征是产生主体明确且能够防范,风险事件的发生直接针对PPP项目;另一部分项目风险分配方案与范式选择高度相关,其相关关系体现为随着范式私有化程度的提高,民间实体承担的风险也在逐渐增大,而且随着范式选择的不同,风险转移的时机和程度也有所差异,这类风险的主要特征是风险事件产生于政府或第三方,民间实体没有能力进行防范,风险损失需要在政府和民间实体之间进行分配。研究结论可为提高我国PPP项目风险分配的科学性提供指导和借鉴。

关键词： PPP 范式选择风险分配

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石泉水库主汛期拦蓄洪尾超蓄运用的风险分析

水力发电学报 2004年第6期23卷 108-110,60页

作者：席秋义黄强赵雪花西安理工大学西安710048

针对水资源匮乏和汛期水库大量弃水的矛盾,提出了有效的解决途径——汛期通过适时拦蓄洪尾超蓄运用的方式来充分利用洪水资源。拦蓄洪尾超蓄运用存在一定的风险,本文就超蓄运用的风险因素进行了识别分析,并从水文频率分析角度提出了计... 详细信息

针对水资源匮乏和汛期水库大量弃水的矛盾,提出了有效的解决途径——汛期通过适时拦蓄洪尾超蓄运用的方式来充分利用洪水资源。拦蓄洪尾超蓄运用存在一定的风险,本文就超蓄运用的风险因素进行了识别分析,并从水文频率分析角度提出了计算超蓄风险率的方法;通过对石泉水库不同超蓄水位的风险率进行计算,结合可接受风险率值,得出了该水库拦蓄洪尾超蓄运用的期望水位。

关键词：水资源风险分析期望超蓄水位拦蓄洪尾可接受风险