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Development and Application of High Performance X80 Line Pipe for the 2.(nd) West-East Gas Pipeline

Journal of Iron and Steel Research International 2011年第S1期18卷 39-48页

作者： LI He-lin 1 , HUO Chun-yong 1 , JI Ling-kang 1, 2., LI Yang 1, 3.(1. CNPC Tubular Goods Research Institute, xi’an 710065, china 2. . {3. of {2. science and Engineering, xi’an jiaotong university, xi’an 710049, china 3. {3. of {2. science and Engineering, university of science and Technology Beijing, Beijing 100083. china) CNPC Tubular Goods Res Inst Xian 710065 Peoples R China xi An Jiao Tong Univ Sch Mat Sci & Engn Xian 710049 Peoples R China Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China

It is the development tendency of gas pipeline to improve strength of line pipe and transmission pressure, which is an important symbol of the progress of gas pipeline technology. The 2.d West-East Gas Pipeline (the 2.nd WEGP) is the largest-scale X80 high pressure gas pipeline project in the world. Through the joint development project by Pipeline Company, research institute, and steel company, a series of achievements of technology have been obtained, which makes it possible to apply pressure of 12.MPa and X80 LSAW and HSAW pipe for the 2.nd WEGP. Specifications of X80 steel and pipe have been issued based on API 5L. High performance X80 steel and pipe have been developed and meets the Specification. General design conception of applying HSAW pipe and LSAW pipe on gas transmission trunk line with large diameter and high pressure has been established. Failure control of the 2.nd WEGP has been carried out to avoid failure and reduce the lost which based on analysis of pipeline failure mode. In this paper, research and development of high performance X80 welded pipe, establishment of technical route of joint application of HSAW and LSAW steel pipe and key technology of failure control are emphatically discussed.

关键词： 2.nd WEGP acicular ferrite failure control arrest toughness strain-based design

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An extended numerical model of the first exothermic peak for three dimensional printed cement-based materials

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Frontiers of Structural and Civil Engineering 2024年第1期18卷 80-88页

作者： Wei JIANG Wenqian LI xi CHEN school of materials {2. and Engineering Tongji UniversityShanghai 200092China school of Civil Engineering Tongji UniversityShanghai 200092China

The first exothermic peak of cement-based material occurs a few minutes after mixing,and the properties of three dimensional(3.)printed concrete,such as setting time,are very sensitive to *** this background,based on the classical Park cement exothermic model of hydration,we propose and construct a numerical model of the first exothermic peak,taking into account the proportions of C_(3.S,C_(3.A and quicklime in *** calculated parameters are calibrated by means of relevant published exothermic test *** is found that this developed model offers a good simulation of the first exothermic peak of hydration for C_(3.S and C_(3.A proportions from 0 to 100% of cement clinker and reflects the effect of quicklime content at 8%-10%.The unique value of this research is provision of an important computational tool for applications that are sensitive to the first exothermic peak of hydration,such as 3. printing.

关键词： 3. printed cement-based materials cement hydration the first exothermic peak liquid quick-setting agent numerical model

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The study of adsorption gas sensor based carbon nanotube film

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science china(Technological sciences) 2005年第4期48卷 372-384页

作者： LI xin1, LIU Junhua2.& ZHU Changchun1 1. school of Electronic and Information Engineering, xi’an jiaotong university,{2., china 2. school of Electric Engineering, xi’an jiaotong university,{2., china school of Electronic and Information Engineering Xi’an Jiaotong University Xi’an China school of Electric Engineering Xi’an Jiaotong University Xi’an China

The study of gas sensitivity of multi-wall carbon nanotubes (MWNTs), which is deposited by low press chemical vapor deposition (LPCVD), is presented. The results show that the pure MWNTs are not sensitive to the gases measured, while the composite film consisting of the MWNTs and silicon dioxide is sensitive to the methane, the hydrogen and the acetylene. The MWNTs and silicon dioxide composite film have the capacitance characteristic because of the formation of Schottky junctions within the MWNTs. The chemistry adsorption of the gas measured on the surface of the MWNTs affects the space discharge area of the Schottky junction, so that the dielectric constant changes with the gas concentration. That is why the gas is sensed.

关键词： gas sensor, carbon nanotubes, low press chemical vapor deposition, scatter.

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Refractive index changes induced by sheet beams with various intensity distributions in LiNbO_(3.:Fe crystal

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science china(Physics,Mechanics & Astronomy) 2005年第4期48卷 399-412页

作者： ZHANG Peng1, ZHAO Jianlin1, XU Honglai1, SUN Yidong2. YANG Dexing1 & WANG Meirong1 1. Institute of Optical Information science and Technology, school of science, Northwestern Polytechnical university, xi’an 710072. china 2. school of science, xi’an jiaotong university, xi’an 710049, china Institute of Optical Information science and Technology School of Science Northwestern Polytechnical University Xi’an China school of science Xi’an Jiaotong University Xi’an China

According to the Kukhtarev equations and a simplified model based on the photovoltaic charge carriers transport mechanism, the distributions of the index changes (DICs) in LiNbO3.Fe crystals induced by sheet beams with various intensity profiles are theoretically analyzed. The numerically simulated results coincide with the analytic expressions deduced from the simplified model. The DICs in a LiNbO3.Fe crystal induced by sheet beams with rectangular, Gaussian and square law profiles are measured by using the interferometric method. By employing the analytic expressions, the experimental data points are well fitted. By utilizing the angular spectrum theory and the ray equation, the uniformities of the intensity profiles of the writing beams along the propagation directions and the influences of the self-defocusing effect of the crystal are numerically simulated, respectively. The results show that the experimental results are reliable. The numerically simulated method and the analytic expressions can be both employed to predict the DICs induced by sheet beams with various light intensity profiles. Furthermore, utilizing writing beams with proper intensity profiles, any desired index distributions could be obtained.

关键词： LiNbO3.Fe crystal, light intensity profile, distribution of refractive index changes, sheet beam.

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ExiSTENCE AND UNIQUENESS OF STRONG PERIODIC SOLUTION OF THE EVOLUTION SYSTEM DESCRIBING GEOPHYSICAL FLOW-PART I: IN BOUNDED DOMAINS

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Chinese Annals of Mathematics,Series B 2001年第3期22卷 385-396页

作者： ZHAO CHUNSHAN, LI KAITAI school of science,{2.,{3., china. school of science Xi'an Jiaotang University Xi'an 710049 China

The existence and uniqueness of a strong periodic solution of the evolution system describing geophysical flow in bounded domains of RN (N = 3. 4) are proven if external forces are periodic in time and sufficiently sm... 详细信息

关键词： Existence and uniqueness Periodic solution Evolution system Geophysical flow

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Structural signature and contact force distributions in the simulated three-dimensional sphere packs subjected to uniaxial compression

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science china(Physics,Mechanics & Astronomy) 2010年第5期53卷 892-904页

作者： LIU LianFeng1,2.ZHANG Lei1 & LIAO ShuFang1 1 Department of Mathematical sciences,xi’an jiaotong-Liverpool {2.,Suzhou 2.512.,china 2.school of science,xi’an jiaotong {2.,xi’an 710049,china Department of Mathematical sciences Xi’an Jiaotong-Liverpool University Suzhou China school of science Xi’an Jiaotong University Xi’an China

Packing of spherical particles in a three-dimensional cylindrical container is simulated by using Discrete Element *** packed bed of spheres is also subjected to vertical compression which results in a dense *** of the packing during compaction are examined in detail in terms of the contact number,deviator fabric,and radial distribution ***,contact force distributions are measured at different locations in the pack,*** centre,the side wall,and the base(or bottom wall) of the *** simulations show that random close packing(RCP) tends to exist in the centre of the pack,while ordered packing structures exist near the container's *** uniaxial compression doesn't seem to alter the packing structure in the pack centre remarkably,but to reduce the structural anisotropy of the packing close to the container's *** simulated results have also helped to establish the correlations between packing structures and contact force ***,it is shown that small contact force distributions are sensitive to local packing *** simulated results are shown to be consistent with the recent experimental and simulation findings.

关键词： packing contact force distribution discrete element method particles boundary effect

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“Blocking and rebalance”mechanism-guided design strategies of bimetallic doped 2. a-phosphorus carbide as efficient catalysts for N_(2. electroreduction

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Journal of Energy Chemistry 2024年第10期97卷 68-78,I0003页

作者： Cheng He Jianglong Ma Shen xi Wenxue Zhang State Key Laboratory for Mechanical Behavior of materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXian 710049ShanxiChina school of materials {2. and Engineering Chang'an UniversityXi'an 710064ShaanxiChina

Compared to single atom catalysts(SACs),the introduction of dual atom catalysts(DACs)has a significantly positive effect on improving the efficiency in the electrocatalytic nitrogen reduction reaction(NRR)which provides an environmental alternative to the Haber-Bosch ***,the research on the mechanism and strategy of designing bimetallic combinations for better performance is still in its early ***,based on"blocking and rebalance"mechanism,45 combinations of bimetallic pair dopedα-phosphorus carbide(TM_(A)TM_(B)@PC)are investigated as efficient NRR catalysts through density functional theory and machine learning *** a multi-step screening,the combinations of TiV,TiFe,MnMo,and FeW exhibit highly efficient catalytic performance with significantly lower limiting potentials(-0.17,-0.18,-0.14,and-0.3. V,respectively).Excitingly,the limiting potential for CrMo and CrW combinations is 0 V,which are considered to be extremely suitable for the NRR *** mechanism of"blocking and rebalance"is revealed by the exploration of charge transfer for phosphorus atoms in electron blocking ***,the descriptorφis proposed with machine learning,which provides design strategies and accurate prediction for finding efficient *** work not only offers promising catalysts TM_(A)TM_(B)@PC for NRR process but also provides design strategies by presenting the descriptorφ.

关键词： DACs Nitrogen reduction reaction 2. a-phosphorus carbide Inherent attributes Machine learning

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The double reflection on the interface of uniaxial crystals in the Savart polariscope

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science china(Physics,Mechanics & Astronomy) 2009年第7期52卷 1003-1006页

作者： WU JunFang1,2.& ZHANG ChunMin1 1 school of science,{2., xi’an 710049, china 2.school of science, xi’an Polytechnic university, xi’an 710048, china school of science Xi’an Jiaotong University Xi’an China school of science Xi’an Polytechnic University Xi’an China

The reflection in the Savart polariscope is different from the isotropic medium. The double reflection of rays in the Savart polariscope is analyzed and discussed on the basis of the Snell law. The double reflection formulae of the extraordinary ray and the ordinary ray are given. These results may provide a theoretical and practical guide for studying, developing and engineering polarization interference imaging spectrometers.

关键词： the Savart polariscope double reflection the Snell law extraordinary ray ordinary ray

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Electrical Breakdown Characteristic of Nanostructured W-Cu Contacts materials

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Journal of Wuhan university of Technology(materials {2.) 2006年第4期21卷 32-35页

作者：王俊勃 school of Mechanical and Electrical Engineering Xi'an Polytechnic UniversityXi'an 710048 ChinaSchool of Science Xi'an Jiaotong University Xi'an 710049China

Nanostructured （ NS ）W-Cu composite powder was prepared by mechanical alloying （ MA ）, and nanostructared bulk of W-Cu contact material was fabricated by hot press sintering in an electrical vacuum furnace. The rnicrostructure, electric conductivity, hardness and break down voltage of NS W- Cu alloys were measured and compared to those of conventional W-Cu alloys prepared by powder metallurg＇y. The experimental results show that microstructural refinement and uniformity can improve the breakdown behavior and the electric arc stability of nanostructared W- Cu contacts materials. Also, the wanostructured W- Cu contact material shows the characteristic of spreading electric arcs, which is of benefit to electric arc erosion.

关键词： nanostructured materials W-Cu alloy electrical breakdown

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Theory of truth degrees of propositions in the logic system Ln^＊

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science in china(Series F) 2006年第4期49卷 471-483页

作者： LI Jun1,2.& WANG Guojun1,3.1. Institute of Mathematics, Shaanxi Normal university, xi’an 710062.{3. 2. {2. of sciences, Lanzhou university of Technology, Lanzhou 73.050,{3. 3. Research Center for science, xi’an jiaotong university, xi’an 710049,{3. Institute of Mathematics Shaanxi Normal University Xi’an China school of sciences Lanzhou University of Technology Lanzhou China Research Center for science Xi’an Jiaotong University Xi’an China

By means of infinite product of uniformly distributed probability spaces of cardinal n the concept of truth degrees of propositions in the n-valued generalized Lu- kasiewicz propositional logic system Ln^＊ is introduced in the present paper. It is proved that the set consisting of truth degrees of all formulas is dense in [0,1], and a general expres- sion of truth degrees of formulas as well as a deduction rule of truth degrees is then obtained. Moreover, similarity degrees among formulas are proposed and a pseudo-metric is defined therefrom on the set of formulas, and hence a possible framework suitable for developing approximate reasoning theory in n-valued generalized Lukasiewicz propositional logic is established.

关键词： truth degree similarity degree approximate reasoning.

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