检索结果-南通市图书馆

ROBUST STABILITY ANALYSIS FOR RAILWAY VEHICLE SYSTEMS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2003年第3期16卷 229-232页

作者： wangyong ZengJing CaoDengqing NationalTractionPowerLaboratory SouthwestJiaotongUniversityChengdu610031China DepartmentofAppliedMechanics SouthwestJiaotongUniversityChengdu610031China

The lateral stability for railway vehicle dynamic system with uncertainparameters and nonlinear uncertain force vector is studied by using the Lyapunov stability theory. Arobust stability condition for the considered system is derived, and the obtained stability boundsare not necessarily symmetric with respect to the origin in the parameter space. The lateralstability analysis for a railway bogie model is analyzed by using the proposed approach. Thesymmetric and asymmetric results are both given and the influence of the adjustable parameter betaon the stability bounds is also discussed. With the help of the proposed method, the robuststability analysis can provide a reference for the design of the railway vehicle systems.

关键词： Uncertain parameters Vehicle system model Robust stability

Perihelion Precession,in Gravitational Field of Center Mass with Electric Charge and Magnetic Moment

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第5期43卷 806-808页

作者： WANGJun wangyong-Jiu InstituteofPhysics HunanNormalUniversityChangsha410081China

With a perfect mathematical method by us, we obtain some expressions of the orbital effect for a test particle and some meaningful results in the gravitational field of the center mass with electric charge and magneti... 详细信息

关键词： magnetic moment additional angle-movement

Energy Radiation of the Active Galactic Nuclei

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2004年第2期41卷 209-210页

作者： TANGZhi-Ming wangyong-Jin InstituteofPhysics HunanNormalUniversityChangsha410081China

In the Hellings Nordtvedt theory, we obtain some expressions of energy radiation and mass defect effect for a kind of the active galactic nuclei, which is meaningful to calculating the energy radiation in the procession of forming this kind of celestial bodies. This calculation can give some interpretation for energy source of the jet from the active galactic nuclei.

关键词： energy radiation mass defect general relativity

Interference Phase of Mass Neutrinos in Kerr Space-Time

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2003年第6X期40卷 742-744页

作者： HUANGXiu-Ju wangyong-Jiu InstituteofPhysics HunanNormalUniversityChangsha410081China

Along the geodesic we calculate the interference phase of the mass neutrinos in some special cases. Because of the rotation of the mass resource which induces the gravitational field, the angular momentum per unit mas... 详细信息

关键词：干涉相克尔时空重力红移微中子碰撞中子物理学

EXPERIMENTAL STUDY ON A NEW KIND OF OPEN TYPE BREAKWATERS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2005年第2期17卷 228-233页

作者： WANGGuo-yu wangyong-xue LIGuang-wei StateKeyLaboratoryofCoastalandOffshoreEngineering DalianUniversityofTechnologyDalian116024China

A new kind of open type breakwaters was proposed based on the concept of wave energy conversion. The excellent feature of the structure is that it can absorb and utilize the wave energy to dissipate waves. The effects of some factors, such as the configuration insides, the geometrical parameters and the relative width (the ratio of the width to the wave length), on the performance of the breakwater were discussed based on a series of regular wave tests in the wave flume. The hydrodynamic characteristics of the new open type breakwater were analyzed in detail, and the structure was optimized to improve the performance of the breakwater to effectively dissipate the waves with long period. The variation of the coefficients of wave transmission and reflection along with attenuation with respect to relative width was examined. The results of the physical model tests indicate that the transmission coefficient significantly decreases by about twenty percent at the range of relative width from 0.1 to 0.2, compared with the traditional open type breakwaters.

关键词： open type breakwater wave energy conversion transmission coefficient physical model test

Spin—Dependent Scattering Effects and Dimensional Crossover in a Quasi—Two—Dimensional Disordered Electron System

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第3期37卷 359-366页

作者： YANGYong－Hong wangyong－Gang 等 DepartmentofPhysics SoutheastUniversityNanjing210096China

Two kinds of spin-dependent scattering effects (magnetic-impurity and spin-orbit scatterings) are investigated theoretically in a quasi-two-dimensional (quasi-2D) disordered electron system. By making use of the diagrammatic techniques in perturbation theory, we have calculated the dc conductivity and magnetoresistance due to weak-localization effects, the analytical expressions of them are obtained as functions of the interlayer hopping energy and the characteristic times: elastic, inelastic, magnetic and spin-orbit scattering times. The relevant dimensional crossover behavior from 3D to 2D with decreasing the interlayer coupling is discussed, and the condition for the crossover is shown to be dependent on the aforementioned scattering times. At low temperature there exists a spin-dependent-scattering-induced dimensional crossover in this system.

关键词： disordered system weak localization magnetic scattering spin-orbit scattering dimensional crossover

Chaotic Dynamics of Test Particle in the Gravitational Field with Magnetic Dipoles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2003年第3X期40卷 301-304页

作者： CHENJu-Hua wangyong-Jiu CollegeofPhysicsandInformationScience InstituteofPhysicsHunanNormalUniversityChangsha410081China

We investigate the dynamics of the test particle in the gravitational field with magnetic dipoles in this paper. At first we study the gravitational potential by numerical simulations. We find, for appropriate parameters, that there are two different cases in the potential curve, one of which is the one-well case with a stable critical point, and the other is the three-well case with three stable critical points and two unstable ones. As a consequence, the chaotic motion will rise. By performing the evolution of the orbits of the test particle in the phase space, we find that the orbits of the test particle randomly oscillate without any periods, even sensitively depending on the initial conditions and *** performing Poincaré sections for different values of the parameters and initial conditions, we further conform that the chaotic motion of the test particle in the field with magnetic dipoles becomes even obvious as the value of the magnetic dipoles increases.

关键词：混沌数值模拟混沌动力学磁偶极子粒子动力学测试 Poincaré截面

REE Characteristics of the Kalatongke Cu-Ni Deposit, Xinjiang, China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2004年第2期78卷 396-403页

作者： WANGYuwang WANGJingbin WANGLijuan wangyong TUCaineng BeijingInstituteofGeologyforMineralResources Beijing100012／／KeyLaboratoryofMineralResourcesResearchInstituteofGeologyandGeophysicsChineseAcademyofSciencesBeijing100029 XinjiangKalatongkeCu-NiMine FuyunXinjiang836107

On the basis of the study on the REE geochemistry of the ore minerals and host rocks of the Kalatongke Cu-Ni deposit, Xinjiang, it is indicated that the major ore minerals, sulfides, were sourced from the host mafic-ultramafic magma. Characterized by low REE content of sulfide, such a Cu-Ni sulfide deposit occurring in the orogen is obviously different from that on the margin of the craton. Because the mafic-ultramafic rocks from the Cu-Ni sulfide deposit occurring in the orogen is water-rich and the REEs of some sulfides show a particular 'multiple-bending' pattern, which suggests coexistence of multiple liquid phases (fluid and melt), the sulfide melt possibly contains a great deal of hydrothermal fluids and increasingly developed gases and liquid-rich ore-forming fluids after the main metallogenic epoch (magmatic segregation stage).

关键词： Cu-Ni sulfide deposit rare earth elements water-rich mafic-ultramafic rock Xinjiang

Geochemistry of the Cenozoic Potassic Volcanic Rocks in the West Kunlun Mountains and Constraints on Their Sources

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2004年第4期78卷 912-920页

作者： ZHANGZhaochong XIAOXuchang WANGJun wangyong LUOZhaohua InstituteofGeology ChineseAcademyofGeologicalSciencesBeijing100037 InstituteofGeology ChineseAcademyofGeologicalSciencesBeijing100037／／ChinaUniversityofGeosciencesBeijing100087 ChinaUniversityofGeosciences Beijing100087

The geochemical characteristics of the Cenozoic volcanic rocks from the north Pulu, east Pulu and Dahongliutan regions in the west Kunlun Mountains are somewhat similar as a whole. However, the volcanic rocks from the Dahongliutan region in the south belt are geochemically distinguished from those in the Pulu region (including the north and east Pulu) of the north belt. The volcanic rocks of the Dahongliutan region are characterized by relatively low TiO2 abundance, but more enrichment in alkali, much more enrichment in light rare earth elements and large ion lithosphile elements than those from the Pulu region. Compared with the Pulu region, volcanic rocks from the Dahongliutan region have relatively low 87Sr/86Sr ratios, and high εNd, 207Pb/204Pb and 208Pb/204Pb. Their trace elements and isotopic data suggest that they were derived from lithospheric mantle, consisting of biotite- and hornblende-bearing garnet lherzolite, which had undertaken metasomatism and enrichment. On the primitive mantle-normalized patterns, they display remarkably negative Nb and Ta anomalies, indicating the presence of early-stage subducted oceanic crust. The metasomatism and enrichment resulted from the fluid released from the crustal materials enclosed in the source region in response to the uplift of asthenospheric mantle. Based on the previous experiments it can be inferred that the thickness of the lithosphere ranges from 75 to 100 km prior to the generation of the magmas. However, the south belt differs from the north one by its thicker lithosphere and lower degree of partial melting. The different thickness of the lithosphere gives rise to corresponding variation of the degree of crustal contamination. The volcanic rocks in the south belt are much more influenced by crustal contamination. In view of the tectonic setting, the generation of potassic magmas is linked with the uplift of asthenosphere resulted from large-scale thinning of the lithosphere after the collision of Indian and

关键词： potassic magma lithospheric mantle asthenospheric mantle metasomatism west Kunlun Mountains