检索结果-南通市图书馆

Journal of Modern Transportation 1994年第1期11卷 22-27页

作者： Qin Keyun Xu Yang( Dept. of Appl. Mathematics, southwest jiaotong university)chengdu 610031,china

In this paper, the syntactical problenss of lattice- valued proptnitional logicsystem LP(X) are discuased , the soundness theorem and the deduction thooremare given, and the adequaey problem of LP(X) is solved with sl... 详细信息

关键词： Lattice-valued proposition algebra fromal proof fromal theorem

大跨度V形刚构拱组合桥V形墩梁节点模型试验研究

在线全文

学校读者我要写书评

暂无评论

土木工程学报 2010年第3期43卷 99-105页

作者：勾红叶蒲黔辉施洲西南交通大学

对于V形刚构拱组合结构桥梁,其结构本身承力、传力相对复杂,而在小榄水道特大桥主桥V形墩梁结合部,其受力尤其复杂。有必要通过模型试验对其局部应力以及开裂后的非线性受力行为进行研究,从而考察V形刚构拱组合桥设计的合理性,并为同类... 详细信息

对于V形刚构拱组合结构桥梁,其结构本身承力、传力相对复杂,而在小榄水道特大桥主桥V形墩梁结合部,其受力尤其复杂。有必要通过模型试验对其局部应力以及开裂后的非线性受力行为进行研究,从而考察V形刚构拱组合桥设计的合理性,并为同类桥梁提供技术参考。简单介绍了模型的相似和设计原则,对模型的加载工况、加载程序、测点布置等也进行了讨论。重点通过对试验结果的分析以及与数值计算的比较,得出多种荷载工况下V形墩梁节点局部应力分布规律;通过绘制负弯矩区钢筋荷载应变曲线以及模型梁的荷载挠度曲线,对V形墩梁节点的非线性受力行为进行了研究,得出了挠度与裂缝分布规律。研究表明,V形墩梁节点受力合理,具有较好的延性、后续变形和残余承载能力,V形刚构拱组合桥设计合理。

关键词：桥梁工程大跨度V形刚构拱组合桥 V形墩梁节点非线性模型试验

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

公路收费转移与合理制订收费标准的研究

西南交通大学学报 2002年第1期37卷 65-67页

作者：初克波西南交通大学交通运输学院四川成都610031

公路收费标准的高低直接影响使用收费公路的交通量的大小 ,进而影响项目效益的发挥。为制订合理的收费标准提供理论依据 ,并为收费公路项目的建设提供决策支持信息 ,通过对影响车辆路径选择因素的分析 ,提出直观运营成本的概念。通过对... 详细信息

公路收费标准的高低直接影响使用收费公路的交通量的大小 ,进而影响项目效益的发挥。为制订合理的收费标准提供理论依据 ,并为收费公路项目的建设提供决策支持信息 ,通过对影响车辆路径选择因素的分析 ,提出直观运营成本的概念。通过对收费转移模型的研究与应用 ,提出了合理确定收费公路收费标准的理论方法。

关键词：收费转移直观运营成本公路运输收费标准交通量路径选择项目经济评价

PRESENT AND FUTURE OF SURPLUS LIFE APPRAISE－MENT METHOD　FOR　UNDERGROUND　STRUCTURE

在线全文

学校读者我要写书评

暂无评论

西部探矿工程 1994年第5期 27-34页

作者： Guan Baoshu, Gao Bosouthwest jiaotong university, chengdu, 610031, china

ＰＲＥＳＥＮＴ　ＡＮＤ　ＦＵＴＵＲＥ　ＯＦ　ＳＵＲＰＬＵＳ　ＬＩＦＥ　ＡＰＰＲＡＩＳＥ－ＭＥＮＴ　ＭＥＴＨＯＤ　ＦＯＲ　ＵＮＤＥＲＧＲＯＵＮＤ　ＳＴＲＵＣＴＵＲＥＧｕａｎＢａｏｓｈｕ，ＧａｏＢｏＳｏｕｔｈｗｅｓｔＪｉ... 详细信息

ＰＲＥＳＥＮＴ　ＡＮＤ　ＦＵＴＵＲＥ　ＯＦ　ＳＵＲＰＬＵＳ　ＬＩＦＥ　ＡＰＰＲＡＩＳＥ－ＭＥＮＴ　ＭＥＴＨＯＤ　ＦＯＲ　ＵＮＤＥＲＧＲＯＵＮＤ　ＳＴＲＵＣＴＵＲＥＧｕａｎＢａｏｓｈｕ，ＧａｏＢｏＳｏｕｔｈｗｅｓｔＪｉａｏｔｏｎｇＵｎｉｖｅｒｓｉｔｙ，...

关键词： structure surplus life structure sound degree structure disease

Tensile properties and fracture behavior of Ti_2AlNb based alloys at room temperature

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2000年第3期10卷 378-381页

作者： PENG Ji hua(彭继华) 1, 2 , MAO Yong(毛勇) 2, LI Shi qiong(李世琼) 2, SUN Xun fang(孙训方) 2 1. Department of engineering Mechanics, southwest jiaotong university, chengdu 610031, P.R.china 2. Division of Super Alloys, Central Iron and S SW jiaotong Univ Dept Engn Mech Chengdu 610031 Peoples R China Cent Iron & Steel Res Inst Div Super Alloys Beijing 100081 Peoples R China

The tensile mechanical properties and fracture behaviors of Ti 22Al 20Nb 7Ta alloys were studied at room temperature. Three typical microstructures of Ti 2AlNb based alloys were obtained by combination of thermal mechanical processing and heat treat ment. They are: 1) lath mixture of O + B 2 with remaining β grain boundaries and α 2 phase; 2) equiaxed O phase in B 2 matrix; 3) fine lath mixture of O + B 2 without remaining β grain boundaries. It is shown that the microstructure obviously affects the tensile properties of Ti 2AlNb based alloys. The microstructure of fine lath mixture of O + B 2 without remaining β grain boundaries has good combination of yield stress and ductility, while the microstructure with lath mixture of O + B 2 with remaining β grain boundaries and α 2 phase has low yield stress and elongation. The fracture mode was also controlled by the microstructure of Ti 2AlNb based alloys. By means of SEM, it was found that the dominated fracture mode of microstructure with lath mixture of O + B 2 with remained β grain boundary and α 2 phase was intergranular, and the fracture mode of the other two microstructures was mainly transgranular.

关键词： Ti 2AlNb based alloys tensile properties fracture behavior

Optimization of Cutting Variables in Machining

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Transportation 1996年第2期13卷 98-104页

作者： Zhang Xueyan Wu Zhenye Zhou Guohua School of Economics and Management,southwest jiaotong university,chengdu 610031,china School of Economics and Management Southwest Jiaotong University Chengdu 610031 China

ith the three criteria for cutting variables proposed by *** and ***,this paper analyzes the reasonable selection of cutting variables,and further states ... 详细信息

ith the three criteria for cutting variables proposed by *** and ***,this paper analyzes the reasonable selection of cutting variables,and further states the relations among maximum profit oriented cutting speed,minimum cost oriented cutting speed and maximum productivity oriented cutting *** puts forward a mathematical model for the optimization of cutting variables in machining.

关键词： machining maximum profit cutting speed

A NEW NUMERICAL METHOD FOR GROUNDWATER FIOW AND SOLUTE TRANSPORT USING VELOCITY FIELD

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2008年第3期20卷 356-364页

作者： ZHANG Qian-fei LAN Shou-qi WANG Yan-ming XU Yong-fu School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai 200030China Shanghai Municipal engineering Design Institute Shanghai 200092 China Department of Geotechnical engineering Tongji University Shanghai 200092 China

A new numerical method for groundwater flow analysis was introduced to estimate simultaneously velocity vectors and water pressure head. The method could be employed to handle the vertical flow under variably saturated conditions and for horizontal flow as well. The method allows for better estimation of velocities at the element nodes which can be used as direct input to transport models. The advection-dispersion process was treated by the Eulerian-Lagrangian approach with particle tracking technique using the velocities at FEM nodes. The method was verified with the classical one dimensional model and applied to simulate contaminant transport process through a slurry wall as a barrier to prevent leachate pollution from a sanitary landfill.

关键词： groundwater flow solute transport velocity vectors finite element method Eulerian-Lagrangian approach particletracking technique

在线全文

学校读者我要写书评

暂无评论

TSC在牵引变电所无功补偿中的应用

铁道学报 2000年第4期22卷 20-23页

作者：张丽李群湛西南交通大学电气工程学院四川成都610031

主要介绍无功平衡约束下 ,带有降压变压器的 TSC及补偿滤波器的设计 ,也涉及到不可调补偿与 TSC可调补偿 (FIX+TSC)的配合使用。整个设计过程及仿真计算是利用可视化语言 CVI完成的 ;并根据变电所运行实测数据。

关键词：固定补偿 TSC可调补偿平均功率因数铁路变电所

Cyclic Hardening Behavior of 1Cr18Ni9Ti Stainless Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Transportation 1994年第1期11卷 36-41页

作者： Yang Xianjie Cao Qing Cai Lixun(Research Institute of AppliedMechanics,southwest jiaotong university,)chengdu 610031, china

The cyclic loading tests for 1Cr18NigTi stainless steel under some non-proportional strain paths and their histories are performed. Experimental resultsshow that the material has nonpropertional additional harderung and the effectsof nonproportional cycling history at the constant temper lower than700℃, but at the hisher temperattire(≥700℃) the cyclic saturated behavior isnot influenced by the prior loading history.

关键词： cyclic hardening i stainless steel nonproportional loading