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     The threshold for the coastal system to climate change,over which irreversible degradation will occur,is still beyond our present knowledge,considering human proactive adaptability,and multi-factors with their complex relationship with the deltaic environments.
     由于影响长江三角洲环境的因素众多,关系复杂,以及人类的主动适应能力,目前难以确定三角洲系统的气候变化阈值,即超过它系统将发生不可逆转的衰退.
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     Second subharmonic vibrations were observed in the surface waves when the driving frequency is above a certain critical value.
     发现在壁的恒定振幅下,侧壁振动频率有一临界值,超过它表面波的频率成为侧壁振动频率的一半,我们称这种波为半频波.
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     Whether China should liberalize capital account evokes a lot of controversies, mainly on whether the benefits of capital account liberalization exceed its costs and risks.
     对于中国是否应该开放资本帐户争论很多 ,主要集中在开放资本帐户的好处是否会超过它的成本和风险。
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     As the material basis of life, if the pollution of soilis beyond its selfpurification capability, the ability of soil living will decrease, even die away,which is harmful for human's health, social economy and ecosystem.
     土壤是人类赖以生存和发展的物质基础和环境条件,如果土壤受到污染或污染负荷超过它的自净能力,它的生存能力就会下降,甚至全部消失,而且土壤中的污染物危害动植物和人类的生命健康,随之对社会经济、生态系统的结构和功能造成破坏。
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     At present, when structure designers are doing optimization design, they only consider structure optimization of design phase and initial cost, and don't consider change of structure performance from design to failure and corresponding cost, but structure performance is descending during the structure's service time, and in some cases, the whole maintenance cost during it's service time can exceed initial cost.
     目前,结构设计人员在进行优化设计时,只考虑了设计阶段的结构优化和初始投资费用,而没有考虑结构从设计到失效的生命周期内性能的变化,也没有计入相应发生的费用,但是结构在服役期间的性能是随着时间而逐渐劣化的,而且在一些情况下,结构服役期间总的维修费用会超过它的初始造价。
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     We want to point out that SAANIMRA has many more advantages than its routing overhead's disadvantages in large scale networks.
     特别在大规模的网络环境下,它的优点超过它在路由开销方面的表现。
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     This is an extension of W.
     是W.
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     Our method is popularized from R.
     是R.
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     It has already been over forty years since the beginning of the study.
     国外对于的研究已经超过 4 0年。
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     It's sailing quality and work capacity have reached and even exceed the international same preducts.
     的航行性能及作业能力达到或超过了国际同类产品。
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     The results obtained are better than those by F.
     此结果超过了F.
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The article discusses the laminar boundary layer on the vaporizing surface of liquid hydrogen over which there is a flow of molecular hydrogen.
      
The theory of short waves assumes that the jump in pressure at the wave front and the region over which the parameters vary are small.
      
Braking of the gas flow produced by the end currents is determined at two fixed sections of the magnetogasdynamic channel from the value of the isolated shock wave formed in the vicinity of the hemispherical model over which the flow passes.
      
In [4] an expression is given for the diffusional flux to the surface of a solid ellipsoidal particle over which a uniform Stokes stream flows.
      
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The method of functions of complex variable is used in solving the problem of small amplitude surface waves on water generated by a vibrating side wall, the general formula for the complex velocity is given, and three different types of wall vibrations are discussed in some detail.Two different methods were used for the measurements and recording of surface waves. The experimental results in the case of small amplitude agree well with theory. Some observation and recording were made with large amplitudes. Second...

The method of functions of complex variable is used in solving the problem of small amplitude surface waves on water generated by a vibrating side wall, the general formula for the complex velocity is given, and three different types of wall vibrations are discussed in some detail.Two different methods were used for the measurements and recording of surface waves. The experimental results in the case of small amplitude agree well with theory. Some observation and recording were made with large amplitudes. Second subharmonic vibrations were observed in the surface waves when the driving frequency is above a certain critical value. This phenomenon is yet to be accounted for theoretically.

侧壁振动所产生的小振幅表面波的理论问题是一个求解具有混合边界条件的Laplace方程的问题.我们在引入一新的变量后,将它化为一Dirichlet问题,及使用复变函数方法求解,得到计算表面波复速势的普遍式.使用它得到了侧壁的三种典型振动的复速度、自由面的鉛直位移,无限远的波幅及辐射功率等.在实验中,装置了两种测量表面波的设备,证明了小振幅波的理论结果并观测了大振幅表面波的一些现象.发现在壁的恒定振幅下,侧壁振动频率有一临界值,超过它表面波的频率成为侧壁振动频率的一半,我们称这种波为半频波.关于半频波还需要可靠的理论解释.

In the present paper,we study the boundedness and stability of solutions of the following n-dimensional system of differential equations: dx/dt=A(t)x+f(t,x) x(t_0)=x_0 (1.1) where A(t)is a contiouous n×n matrix for t≥t_0≥0 and f(t,x)is a con- tinuous vector function for t≥t_0,x∈D={x||x|

In the present paper,we study the boundedness and stability of solutions of the following n-dimensional system of differential equations: dx/dt=A(t)x+f(t,x) x(t_0)=x_0 (1.1) where A(t)is a contiouous n×n matrix for t≥t_0≥0 and f(t,x)is a con- tinuous vector function for t≥t_0,x∈D={x||x|0 is a certain constant or+∞.Then the solution of(1.1)passing through(t_0,x_0)can be continued to the interval(t_0,t_0+α)and |x(t)|≤y(t) for t∈[t_0,t_0+α In §3,§4,we use the fundamental theorem to obtain some ratiher general criteria for boundedness and stability of solutions of(1.1)which include a series of results concerned [1] [2] [3] [6],and in this manner one may see the internal relation between these results.In this paper we also come to a similar result obtained by Stokes [16]which relies on a fixed point theorem for locally convex topological linear space due to Tychonoff.

本文討論n维方程组(1.1)。在假設(1.4)与(1.5)之下,得基本定理——若方程(2.7)的最大解要延拓,則方程组(1.1)的解的范不超过它,且也可延拓。由此给出(1.1)的解的有界性和稳定性的判別法,这概括了一系列的有关結果,如文献[1]、[2]、[3]、[6]、[16]、从而看出这些結果的相互关系。

The effect of the monochromaticity of relativistic electron beam's energy on the small signal gain of free electron lasers is analyzed. For a certain pumping field, there is a critical energy divergency, over which the small signal gain will become negative. The shorter the wavelength and the longer the magnification length, the higher is the requirement of energy monochromaticity of electron beam for laser amplifiers. But the requirement of monochromaticity of electron beam for laser oscillators is much lower....

The effect of the monochromaticity of relativistic electron beam's energy on the small signal gain of free electron lasers is analyzed. For a certain pumping field, there is a critical energy divergency, over which the small signal gain will become negative. The shorter the wavelength and the longer the magnification length, the higher is the requirement of energy monochromaticity of electron beam for laser amplifiers. But the requirement of monochromaticity of electron beam for laser oscillators is much lower.

本文分析了相对论电子束的能量单色性对自由电子激光器小信号增益的影响,对给定的泵浦场,存在临界能量分散度,超过它之后小信号增益将变为负值,波长越短,放大长度越长的激光放大器,对能量单色性的要求越高;激光振荡器对能量单色性的要求则比激光放大器低得多。

 
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