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moving source     
相关语句
  移动荷载
     Dynamic Response of Track-ground Systems Due to Moving Source
     移动荷载作用下的轨道-地基系统的动力响应
短句来源
     Dynamic Analysis of Ground-Track System Due to Moving Source
     移动荷载作用下地基—轨道系统的土动力分析
短句来源
     Dynamic Analysis of Track-Viaduct System Due to Moving Source
     移动荷载作用下轨道-高架桥系统的动力分析
短句来源
     Dynamic Response of Track-Ground Systems Due to High Speed Moving Source
     轨道—地基系在移动荷载作用下的协同工作分析
短句来源
  运动源
     The experimental cross section of emitted a particles is 3300 mb and the correspondent theoretical value by moving source model is 3700 mb.
     实验所得的发射α粒子截面为3300mb,运动源模型计算值为3700mb。
短句来源
     294 MeV Ne Beam has bombarded Tb target. The energy spectra of emitted α particles have been measured at the angles of 10°-150° us ng △E-E telescopes and analyzed by means of three moving source models. The parameters associated with fast source, intermediate source and fusion evaporation source have been obtained.
     在294MeV Ne束轰击Tb靶的反应中,用△E-E望远镜测量了10°—150°发射的α粒子能谱,并用运动源模型拟合了所得的实验能谱,得到与前角度源、中等速度源、熔合蒸发源的有关参数。
短句来源
     Based on Biot's basic motion equations for the fluid saturated porous elastic medium and by using the method of complex function,the displacement field due to moving source with umiform veloicy U in an infinite porous elastic saturated space is studied in present paper,Two types of sources are considered:a.
     基于Biot的饱和孔隙弹性介质的运动方程和利用复变函数方法,本文研究了无限饱水孔隙弹性空间中由常速运动源所产生的位移场。
短句来源
     The spectra of 3He,α and 6He detected at backward angle in coincidence with residues having different average velocities are analyzed with moving source fit. The average excitation energy of hot nuclei is obtained in the incomplete fusion frame. It is shown that the slope temperature extracted from 3He( 6He) spectra is higher (lower) in the neutron-rich system 40 Ar+ 124 Sn than that in the neutron-deficient system 40 Ar+ 112 Sn.
     在不同的线性动量转移下用运动源模型拟合了后角的3 He,α和6He能谱 ,发现3 He的能谱斜率温度在12 4 Sn系统中高于112 Sn系统 ,而6He的温度在112 Sn系统中更高 ,α粒子在两个系统中没有明显差别 .
短句来源
     Three special internal waves, i.e., the precursor soliton, algebraic solitary wave and fiat solitary wave, induced by a moving source, are described, in which the internal flat solitary wave is shown to be a typical limiting solitary wave in experiments by the authors and then is first formulated by a conjugate flow model.
     概述了运动源诱生的先锋内孤立子、代数孤立子和平孤立波3类特殊非线性内波的研究进展,其中运动潜体生成的平孤立内波被作者实验证实是一类极限孤立波,并首次建立了共轭流动模型予以描述;
短句来源
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  运动点源
     Suarface Effects of Internal Wave Generated by a Moving Source in a Two-Layer Fluid of Finite Depth
     有限深度两层流体系统中运动点源生成的内波及其与自由面的相互作用
短句来源
     Research on Interal Waves by A Moving Source
     运动点源产生的内波
短句来源
     A Second-order Solution on Internal Waves Generated by a Moving Source in Two Layers Fluid with Small Density Difference
     具有小密度差的两层流体中运动点源的二阶内波解
短句来源
     Higher order waves generated by a moving source in a two-layer inviscid, incompressible fluid of finite depth with small density difference were studied.
     研究了运动点源在无粘、不可压且具有小密度差的两层有限深流体中生成的高阶波动。
短句来源
     Depending on euler equation and continuity equation, the internal waves produced by a moving source in the stably-stratified ocean are analyzed, and the formulas to calculate the perturbation velocity and the numerical calculating method of the internal waves produced by submarine are presented.
     从Euler方程和连续性方程出发,分析运动点源在密度层化海洋中产生的内波,给出内波速度场的计算公式及数值计算方法,并给出潜艇艇体效应产生的内波的计算方法。
短句来源
  运动声源
     Modeling the underwater sound field by wavenumber integration for a rapidly moving source in air
     空气中快速运动声源水下声场的波数积分模型
短句来源
     Simulated result indicates that it can precisely localize a moving source target for low SNR case(-35dB).
     仿真结果表明:在小信噪比(-35dB)情况下仍可对运动声源目标精确定位。
短句来源
     A Moving Source Target Localization Method for Low SNR Case
     一种适用于小信噪比条件的运动声源目标定位方法
短句来源
     Simulation of Received Signal in Shallow Water Excited by Airborne Rapid Moving Source
     空气中高速运动声源激发的浅海水下信号仿真
短句来源
     Moving Source Identification Method Based on the Statistically Optimal Planar Near-field Acoustical Holography
     基于统计最优平面近场声全息理论的运动声源识别方法
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  moving source
Theoretical and physical scale model responses for moving source and fixed loop electromagnetic exploration systems are presented for the case of a vertical, thin, plate conductor located first in free-space and then in a conductive host.
      
Comparison of Theoretical and Physical Model Studies of the Responses of Moving Source and Fixed Loop Electromagnetic Exploratio
      
The Use of Wave-field Directivity for Velocity Estimation: Moving Source Profiling (MSP) Experiments at KTB
      
For a stationary source the incident waves have velocities of the same magnitude, however for a moving source the velocities of the two incident waves are respectively increased and decreased by the velocity of the source.
      
The paper describes a new portable highly sensitive dual-frequency electromagnetic prospecting unit designed for detailedem surveys based on moving source compensation method.
      
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Fault-plane solutions of the mainshock and 17 large aftershocks are computed on the DJS-6 computer from the data of the first motions of P waves. Based on the model of finite moving source, the fracture processes and the source parameters of the mainshock and three largest aftershocks are estimated. The Mainshock occurred on a nearly vertical right-lateral strike-slip fault, striking N 30°E, with an asymmetric bilateral fracture which propagated 70 km northeastward and 45 km southwestward with an...

Fault-plane solutions of the mainshock and 17 large aftershocks are computed on the DJS-6 computer from the data of the first motions of P waves. Based on the model of finite moving source, the fracture processes and the source parameters of the mainshock and three largest aftershocks are estimated. The Mainshock occurred on a nearly vertical right-lateral strike-slip fault, striking N 30°E, with an asymmetric bilateral fracture which propagated 70 km northeastward and 45 km southwestward with an average velocity of 2.7 km/sec. Source parameters of the mainshock such as the average dislocation, seismic moment and stress-drop are estimated to be 136 cm, 1.24×1027 dyne, cm and 12 bars respectively.Most of the aftershocks with ML > 5.0 occurred near the main fault plane and along the fracture branches at both of its ends. These fracture branches are located in the dilatational quarters and make about 80° angles with the mam fault plane. On the two fracture branches, most of the major aftershocks are concentrated. A mechanical analysis of this phenomenon of fracture propagation is attempted in this paper.It is shown that for complex deformations, the fracture propagation no longer takes place along the original plane for brittle materials but deviates from it by a certain angle. The mechanical model used to calculate this deviation angle of fault yields results which agree essentially with the observation.Based on the above results, it can be inferred that the characteristics and mechanical conditions of the Tangshan earthquake as well as those of the Haicheng earthquake are quite different from those of the earthquakes occurring on some great faults which may be explained by stick-slip mechanisms. These two earthquakes are not only caused by the horizontal stress fields but also by local vertical forces induced from the movement of the underground materials. It is also worthy of note that Tangshan earthquake is different from Haicheng earthquake in that it occurs in a relatively homogeneous and brittle medium and therefore no foreshocks took place before the mainshock.

由 P 波初动符号资料在 DJS-6机上计算了主震及17个较大余震的断层面解,并按照有限移动源模式测定了主震及三个最大余震的震源参数.主震是发生在一个近似直立的右旋走滑断层上,走向 N30°E,破裂方式为不对称的双侧破裂,以2.7公里/秒的平均速度向北东传播70公里,向南西传播45公里.测定的主震震源参数例如平均位错136厘米,地震矩1.24×10~(27)达因·厘米,应力降12巴等.大多数 M_L>5.0的余震是发生在主破裂面附近及主破裂面两端的扩展分支上,该扩展分支位于膨胀符号区并与主破裂偏离80°左右.较大余震的多数亦集中在这两个扩展分支上.本文试图从理论上分析这种断裂扩展的力学特征.对于脆性材料的复合变形情形,破裂不再沿原来平面扩展,而是与原来平面偏离一个角度的另一面内扩展.并提出一个力学模型,计算了断层扩展角,计算结果与观测事实比较吻合.根据以上结果,本文讨论了唐山地震特点及发生的力学条件,认为唐山地震不同于发生在大断层上能用粘滑机制解释的那类地震,它和海城地震类似的是,除水平应力场作用外,还可能有地下物质的变迁,由于这种变迁使局部地壳受到垂直力.它和海城地震不同的是,它发生在一个比较均匀的脆性介质...

由 P 波初动符号资料在 DJS-6机上计算了主震及17个较大余震的断层面解,并按照有限移动源模式测定了主震及三个最大余震的震源参数.主震是发生在一个近似直立的右旋走滑断层上,走向 N30°E,破裂方式为不对称的双侧破裂,以2.7公里/秒的平均速度向北东传播70公里,向南西传播45公里.测定的主震震源参数例如平均位错136厘米,地震矩1.24×10~(27)达因·厘米,应力降12巴等.大多数 M_L>5.0的余震是发生在主破裂面附近及主破裂面两端的扩展分支上,该扩展分支位于膨胀符号区并与主破裂偏离80°左右.较大余震的多数亦集中在这两个扩展分支上.本文试图从理论上分析这种断裂扩展的力学特征.对于脆性材料的复合变形情形,破裂不再沿原来平面扩展,而是与原来平面偏离一个角度的另一面内扩展.并提出一个力学模型,计算了断层扩展角,计算结果与观测事实比较吻合.根据以上结果,本文讨论了唐山地震特点及发生的力学条件,认为唐山地震不同于发生在大断层上能用粘滑机制解释的那类地震,它和海城地震类似的是,除水平应力场作用外,还可能有地下物质的变迁,由于这种变迁使局部地壳受到垂直力.它和海城地震不同的是,它发生在一个比较均匀的脆性介质内,因而能够积累能量发生大震而没有前震.

In recent years the numerical calculations of welding tempeiature field have been got prcgress.Most of them were calculated by linear finite element equaticns or difference equations.In this paper,we analysis the non-linear heat conducting problemsby FEM,establish the calculated model of instantaneous welding temperature field andcompile the relevant computer programs.In these programs,the heat transfer conditionsof surface and the variation of thermal physical property that depend on temperaturehave been considered.The...

In recent years the numerical calculations of welding tempeiature field have been got prcgress.Most of them were calculated by linear finite element equaticns or difference equations.In this paper,we analysis the non-linear heat conducting problemsby FEM,establish the calculated model of instantaneous welding temperature field andcompile the relevant computer programs.In these programs,the heat transfer conditionsof surface and the variation of thermal physical property that depend on temperaturehave been considered.The two-dimensional temperature field of thin or thick plate causedb'y fixed or moving source during quasi-stable or non-quasi-stable conditions can alsobe analyzed by FEM.In this paper,the temperature fields caused by fixed or movingsource of thin plates butt welding have been analyzed as exemples.The results showthe calculated accuracy can be improved when the temperature dependent thermal physicalproperty and heat transfer condition of surface were considered.The analysis alsoshow tha the temperature distribution of weld metal and the nearby zone is tending towards quasi-stable if the provided calculated model size is suitable.

焊接温度场的数值计算,近年来取得不少进展,但其中大多是采用线性有限单元方程或差分方程求解的。本文对非线性的热传导问题进行了有限元分析,建立了焊接温度场的计算模型,编制了相应的计算机程序。该程序考虑了材料热物理性能随温度的变化以及表面的散热情况,并可以进行固定热源或移动热源、薄板或厚板、准稳态或非准稳态二维温度场的有限元分析。文中就固定热源或移动热源薄板对接焊等几个具体实例进行了有限元分析。结果表明,考虑热物理性能随温度的变化以及表面的散热条件能使计算精度得到提高。并且还表明,只要选取合适的计算模型尺寸,焊缝及近缝区的温度分布便可趋向于准稳定状态。

The micro-diffusion equation for Zener pairs and asymmetric pairs of point defects in fcc metals under the action of periodic distributional moving sources of inner stress have been solved by using finite Fourier transformation and Laplace transformation. Finite sum formulae for rigidity and damping coefficient of a kink have been obtained.

对于在周期分布的运动内应力源作用下,面心立方晶体中Zener对和不对称点缺陷对的微扩散方程采用有限傅氏级数和拉氏变换求解。得出弯结刚性和阻尼系数的有限求和表达式。 给出了有关数值计算结果。对于刃型位错与不对称点缺陷对的滞弹性交互作用得出了简单解析结果,与以前用别的方法所得结果相符。讨论了点缺陷内耗的位错增强效应。

 
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