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APPLICATION OF NUMERICAL SIMULATION TO STUDY ON THERMAL CONDUCTION

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Acta Metallurgica Sinica(English Letters) 2004年第1期17卷 16-20页

作者： C.zhu z.xu D.E.Wu Tianjin University Tianjin 300074China School of SciencesCivil Aviation University of ChinaTianjin 300300ChinaSchool of SciencesCivil Aviation University of China.Tianjin 300300ChinaSchool of SciencesCivil Aviation University of China.Tianjin 300300China

In this paper, using computer simulation and mathematic experiment method to solve the simplified one dimensional thermal conduction equation and to obtain the temperature distribution in a metal bar when its one end was heated. According to principle of hot expansion, a holograph of temperature distribution in the bar by laser holo-technique was taken. The results of numerical simulation and experiments are in good agreement and a new method for study on thermal conduction by laser holo-technique was found.

关键词： metal bar thermal conduction equation computer simulation holograph

US economic and trade sanctions against China: A loss-loss confrontation

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Economic and Political Studies 2023年第1期11卷 17-44页

作者： Liang Guo Sizhu Wang Nicole z.xu Jack H.Brown College of Business and Public Administration California State UniversitySan BernardinoCAUSA School of Finance Renmin University of ChinaBeijingChina Chinese American Youth Association AtlantaGAUSA

The economic and trade sanctions implemented by the United States(US)against China have lasted for a few decades and the structural imbalance of the US–China trade relationship has ultim-ately been escalated to a trade war *** examine the eco-nomic impacts of US sanctions against China on both sponsor and target countries during the last 20 *** find that such impacts have significantly changed over *** one hand,US economic sanctions have gradually extended from China’s labour-intensive to high value-added products and they have largely slowed down China’s trade growth for the last *** the other hand,US consumers and businesses have faced higher pri-ces and production costs for Chinese imports(or import substi-tutes)in the wake of the increasing US trade sanctions,leading to great deadweight losses to the sponsor *** addition,US economic and trade sanctions against China have largely impacted other economies involved in US–China trade as *** intermediary status of the Hong Kong SAR has been greatly ***,US economic and trade sanctions have caused pain on both China and the US,but their impact on China(the target country)has been largely weakened.

关键词： Economic sanctions US–China trade war export control

Quantifying Tectonic and Geomorphic Interpretations of Thermochronometer Data with Inverse Problem Theory

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Communications in Computational Physics 2011年第1期9卷 129-146页

作者： G.Bao Y.Dou T.A.Ehlers P.Li Y.Wang z.xu Department of Mathematics Michigan State UniversityEast LansingMI 48824USA Institut fuer Geowissenschaften Universitat TuebingenGermany Department of Mathematics Purdue UniversityWest LafayetteIN 47907USA Department of Mathematics Fudan UniversityShanghaiChina Department of Mathematics Harbin Institute of TechnologyHarbinChina

Thermochronometer data offer a powerful tool for quantifying a wide range of geologic processes,such as the deformation and erosion of mountain ranges,topographic evolution,and hydrocarbon *** increasing interest to quantify a wider range of complicated geologic processes,more sophisticated techniques are *** paper is concerned with an inverse problem method for interpreting the thermochronometer data *** novel models are proposed to simulate the crustal thermal fields and paleo mountain topography as a function of tectonic and surface *** is a heat transport model that describes the change of temperature of rocks;while the other is surface process model which explains the change of mountain *** computational algorithms are presented for solving the inverse problem of the coupled system of these two *** model successfully provides a new tool for reconstructing the kinematic and the topographic history of mountains.

关键词： Thermochronology heat equations inverse problem variational method iterative method surface processes

PLASMA SURFACE ALLOYING OF AGE-HIGH SPEED STEEL

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Acta Metallurgica Sinica(English Letters) 1999年第5期12卷 836-840页

作者： z.H.Li,X.P.Liu,Y.Gao and z.xu Research Institute of Surface Engineering, Taiyuan University of Technology,Taiyuan 030024, China

It, ageing high speed steel (AHSS) with high cobalt, has a strong ability of age hardening. However, it has two disadvantages, One is short of toughness, the other is its high price because of its too much alloy content especially cobalt. All of these effect on its widespread using. Now there is a new method without the two flows to form this steel in the surface of ingot iron by use of double glow plasma surface alloying *** this paper, the following three parts are introduced: the metallurgical process of this surface ageing high speed steel (SAHSS), the micro structure of the alloying layer, the alloy distribution in the layer. By using the designed source pole, the special alloying process, the required surface alloying content, just like the AHSS—Co23W11Mo7 can be achieved in the surface layer. This new method has wide prospect in the fields of tools, moulds and other wear resisting fields.

关键词： SAHSS metallurgical process age hardening

Mechanistic Study into the Hypervalent Iodine-Catalyzed Difluorination of Alkenes

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Mechanistic Study into the Hypervalent Iodine-Catalyzed Difl...

SPHINGOSINE-1-PHOSPHATE SUPPRESSES CYCLOPHOSPHAMIDE INDUCED FOLLICLE APOPTOSIS IN HUMAN FETAL OVARIAN TISSUE

中国化学会第十二届全国物理有机化学学术会议

作者： z.xu Q.zhang H.Yu Y.Fu Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Urban Pollutant ConversionAnhui Province Key Laboratory of Biomass Clean EnergyiChEMDepartment of ChemistryUniversity of Science and Technology of China Department of Chemistry and Centre for Atomic Engineering of Advanced Materials Anhui University Institute of Industry & Equipment Technology Hefei University of Technology

＜正＞Organofluorine compounds are of great importance in modern organic *** the past years,the hypervalent iodine-catalyzed reaction has been demonstrated to be an efficient method to construct organofluorine compoun...

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SPHINGOSINE-1-PHOSPHATE SUPPRESSES CYCLOPHOSPHAMIDE INDUCED ...

DOUBLE GLOW PLASMA SURFACE ALLOYING OF Ti6A14V AND TiAl

2014浙江省计划生育与生殖医学学术年会暨“第七届生殖安全转化医学研讨会”

作者： Y.Meng Y.zhou F.Wu z.xu W.Chen S.Xie C.Xie Reproductive centre The first Affiliated hosptal of Wenzhou medical universily

Problem statement:As the tremendous progress was achieved in chemo-and radiotherapy,the number of cancer survivor raised steadily,but the quality of life decreased due to the anti-cancer treatment related premature ovarian failure(POF).Recent researches have demonstrated apoptosis is one of the important mechanisms in the above

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Acta Metallurgica Sinica(English Letters) 2002年第2期15卷 172-176页

作者： z.xu, L. Qin, B. Tang and z. Y. He Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China X.S. Xie and C.L. zheng School of Materials Science and Engineering, University of Science and Technology Beijing, Beiji

In order to improve the wear resistance of titanium alloy Ti6Al4V and high temperature oxidation resistance of intermetallic compound TiAl, the Double Glow Plasma Surface Alloying Technique (DG technique) was applied to modify the surface properties of these materials. Mo, Nb, Cr, Ni were diffused into the substrate materials to form alloyed layers with different properties. This paper shows the microstructure, microhardnesses, distributions of the alloy elements on the alloyed layers. Wear and high temperature oxidation tests were carried out. Test results indicate that the wear resistance of Ti6Al4V and the high temperature oxidation resistance of TiAl were improved significantly.

关键词： High temperature effects Oxidation resistance Surface treatment Titanium alloys Wear resistance

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强非线性振动的增量摄动法

邵阳高专学报 1997年第3期10卷 292-296页

作者： H.S.YChan K.W.Chung z.xu

介绍了形如的强非线性振动的增量摄动法,式中g(x)和f(x,x是自变量的任意非线性函数。该法是无需λ很小情况下的反复的摄动法的扩展,它结合了增量法和摄动法两者的突出优点,振动的极限环对任何需要的精度均可计算,极限环的稳定性也可以... 详细信息

介绍了形如的强非线性振动的增量摄动法,式中g(x)和f(x,x是自变量的任意非线性函数。该法是无需λ很小情况下的反复的摄动法的扩展,它结合了增量法和摄动法两者的突出优点,振动的极限环对任何需要的精度均可计算,极限环的稳定性也可以论述。

关键词：强非线性振动增量摄动法非线性振动

Selective Area Epitaxy of InGaN/GaN Multiple Quantum Wells on GaN Micro-facets

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Selective Area Epitaxy of InGaN/GaN Multiple Quantum Wells o...