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long-term behaviour
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     THE LONG-TERM BEHAVIOUR OF OPTICAL VARIABILITY OF NGC 4151
     NGC4151的长期光变行为
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     Long et L.M.
     M .
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     Long Ago
     多年以前
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     Long-span P.C.
     C.
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     DADDY-LONG-LEGS
     [长腿叔叔]
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     On the Long-term Planning
     远景规划与总体规划
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  long-term behaviour
We provide simple conditions for the existence of quasistationary distributions that can be used to describe the long-term behaviour ofopen autocatalytic reaction systems.
      
Direct methods provide elegant and efficient approaches for the prediction of the long-term behaviour of engineering structures under arbitrary complex loading independent of the number of loading cycles.
      
These were then used to investigate various methods of extrapolation to long-term behaviour.
      
Long-term behaviour of a hydroxyapatite/collagen-glycosaminoglycan biomaterial used for oral surgery: a case report
      
On the long-term behaviour of rubber-modified polystyrene compositions
      
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The human engineering activity as a geological agency is even morepowerful to a certain degree in strength and range than the naturalgeological agency for remaking natural geological enviroment.This papersummarizes some engineering geological processes and phenomena whichstrongly affect the natural geological enviroment in city:land subsidence,landsink,slope failure and activity of underground water.The characte-ristics of geological elements and society function of a city make up thefollowing characteristics...

The human engineering activity as a geological agency is even morepowerful to a certain degree in strength and range than the naturalgeological agency for remaking natural geological enviroment.This papersummarizes some engineering geological processes and phenomena whichstrongly affect the natural geological enviroment in city:land subsidence,landsink,slope failure and activity of underground water.The characte-ristics of geological elements and society function of a city make up thefollowing characteristics of citic engineering geological processes:zonal,long term behaviour-and complexity,social nuture and systematicness.Their Strength and speed are greater than natural geological processes ofthe same kind.

本文概述了影响城市地质环境的几种工程地质作用与现象:地面沉降、地面塌陷、斜坡破坏和地下水的作用.城市地质要素的特征和城市的社会职能决定了城市中工程地质作用与现象具有下述特点:区域性、长期性和复杂性、社会性、系统性,并较同类物理地质作用速率高.

he predictability of the monthly mean variations of the relative sunspot number for the period of time from January 1850 to May 1992 is examined based upon the theory of nonlinear dynamical system. The attractor of the variation process is reconstructed using the method of time delays. The attractor is used to compute its largest Lyapunov exponent (λ1= 0.023±0.004 bits/month). The upper limit (t=3.6±0.6 years) of the theoretical time-scale on which the monthly mean sunspot number can be used to make deterministic...

he predictability of the monthly mean variations of the relative sunspot number for the period of time from January 1850 to May 1992 is examined based upon the theory of nonlinear dynamical system. The attractor of the variation process is reconstructed using the method of time delays. The attractor is used to compute its largest Lyapunov exponent (λ1= 0.023±0.004 bits/month). The upper limit (t=3.6±0.6 years) of the theoretical time-scale on which the monthly mean sunspot number can be used to make deterministic prediction is estimated. The results indicate that the predictability of a dynamical system is directly related to the largest Lyapunov exponent of the system, and the evolution for the montlily mean variation process of the relative sunspot number is neither periodic nor quasiperiodic, but is chaotic. Its long term deterministic behaviour is unpredictable, even if we have known a deterministic set of equations describing the process in the future, the deterministic behaviour of the process allows for short term predictions only, because of the variation process of the relative sunspot number is an inherent chaotic system.The purely numerical statistical approach used to predict long term behaviour of the sunspot number seems to be useless.

本文用非线性动力系统理论探讨了现代太阳周(1850年1月─1992年5月)黑子相对数月平均变化过程的可预报性。用时间延迟方法重构吸引子,计算它的最大Lyapunov指数(λ_1=0.023±0.004bits/月),估算了用这些黑子数进行确定性预报的理论时限(t=3.6±0.6年).结果表明,动力系统的可预报性与它的最大Lyapunov指数有直接关系,黑子数月平均变化过程的演化不是周期的,也不是拟周期的,而是混沌的。即使今后找到了描述该过程的确定性方程,它的长期行为也不可能准确地预报,只能作短期预报,这是黑子数本身的混沌特性决定的。用于黑子数预报的纯粹数值统计方法仅对短期预报才有效。

Based on the multiaffinity point of view,in this paper,the scalling behaviour of time series is studied for some dynamic and seismogenic systems.The preliminary resutls show that the structure of attractor is stable when the variations of the structure funtion With time.A long term behaviour for seismogenic system manifested as a stable characteristic,and the scalling curves of structure function are smooth.in particular,there is a tendency reduction for the scalling values of the structure function...

Based on the multiaffinity point of view,in this paper,the scalling behaviour of time series is studied for some dynamic and seismogenic systems.The preliminary resutls show that the structure of attractor is stable when the variations of the structure funtion With time.A long term behaviour for seismogenic system manifested as a stable characteristic,and the scalling curves of structure function are smooth.in particular,there is a tendency reduction for the scalling values of the structure function before the main events,for example,Haicheng and Tangshan earthquakes.The characteristics of seismic activities in BeibuBay area are different from two districts above montioned, And the scalling behaviour of the curves for structure function manifects as a period oscillation phenomena.At present,the value of the scalling curves is just at a peak state. This phenomona need to be tracked and investigated further.

根据多重仿射性概念研究了某些动力系统以及地震孕育系统时间序列的标度行为。初步结果得到某些动力系统的结构函数.随着时间序列窗口的增长,吸引子显示出较为稳定的结构,而孕震系统长时间过程表现为较为稳定,曲线较为光滑;临震前结构函数值有明显下降趋势,例如,海城与唐山震例。而北部湾地区的地震活动特征不同于上述地区。主震前,结构函数曲线表现为一种有序的周期振荡现象.目前正处在峰值状态,急需进一步跟踪探索及预报。

 
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