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basic current
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  基本气流
     The main mechanism to check the development is the feeding-back effect of the unstable disturbances on the basic current.
     扰动对基本气流作非线性的反馈,使扰动不再能从基本流場得到能量(位能或动能),于是扰动停止发展。
短句来源
     Under the condition of shear of basic current, the frequency analysis for the linearized disturbance equations is carried out.
     同时,在存在基本气流切变的情况下,对线性化扰动方程进行了频率分析,结果指出,当n≥1时,Rossby波和惯性-重力波是可分的;
短句来源
     After the jet at the middle-lower level become stronger and the cyclonic shear of the basic current of ITGZ increases, the disturbances in ITGZ will develope into typhoons.
     辐合带扰动,是在这些中、低空急流加强和基本气流气旋性切变增大以后发展成台风的。
短句来源
     The results obtained show that the basic current and disturbances constrain each other, that the basic current alters quasi-periodically with periods of 10 to 13 days, and that the rate of change of basic current in each cycle is quite different.
     从所得的结果中看出:基本气流与扰动是相互制约的,基本气流的变化有准周期性,具有10—13天不等的周期,在各个循环中,基本气流增长及减弱的速率也很不一样。
短句来源
     By using a two-level quasi-geostrophic truncated spectral model, and taking the nonlinear interaction between different wave components (basic current, ultra-long waves and long waves) into consideration, the index cycle of circulation is investigated.
     本文用两层准地转截谱模式,考虑基本气流、超长波和长波之间的非线性相互作用,得出了大气环流指数循环这种准周期振荡过程,其周期为8—15天.
短句来源
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  基本电流
     Furthermore, CMOS MOCCII circuit with simple structure has been configured using basic current mirror technique. Both proposed MOCCII filters have been verified by PSPICE simulation,
     同时应用基本电流镜技术实现出结构简单的高精度CMOS MOCCII,并对MOCCII及提出的滤波器电路进行了PSPICE仿真。
短句来源
     The filter uses two basic current mirrors and two loss-free integrators, and can realize different kinds of filtering responses by changing input signal forms.
     该滤波器由两个基本电流镜和两个无耗积分器构成,改变其输入信号的输入位置,可以实现不同类型的滤波响应特性。
  “basic current”译为未确定词的双语例句
     Basic Current Situation and Characteristics of Sichuan Energy System
     四川能源系统的现状与特征
短句来源
     Secondly, we describe the basic current situation from three respects, which are the debt level, the equity structure and debt structure, and compare these with the western developed countries. Appling the capital structure theory, we analyse the flaw of the corporate governance and the negative effect on the corporate value which result from the defect of the capital structure;
     第二部分从上市公司的总体负债水平、股权结构及债务融资结构三方面描述了我国上市公司资本结构的基本现状,并与西方发达国家公司相比较,运用资本结构理论分析了我国上市公司由于资本结构缺陷所导致的公司治理结构的不合理,并进一步分析了公司治理结构不合理对公司价值增长造成的负面影响;
短句来源
     Besides, the evolution of a disturbance is determined completely its structure, especially by the direction of its axis and its relative position in the basic current.
     其次,扰动发展与否完全由扰动的结构所决定,其中主要是由扰动轴线的方向及其与基流的相对位置所决定。
短句来源
     The geostrophic adjustment process with the basic current in shear is studied.
     文中研究了处于地转平衡状态的切变基流中的地转适应过程。
短句来源
     The kinetic energy required for the development of these disturbances is probably transfered mainly from the kinetic energy of the basic current with stronger cyclonic shear.
     扰动发展的动能,可能主要来自具有较强气旋性切变的基本气流动能。
短句来源
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  basic current
An attempt is made to use the barotropic vorticity equation in spectral form in order to study barotropic instability when the basic current has east-west quasi-stationary asymmetries on the scale of long waves.
      
An earlier investigation concerning the effect of vertical wind shear in the basic current on the propagation speed and divergence of tropospheric equatorial waves is extended to include the effect of parameterized heating.
      
Studying discrete symmetry transformations between the 16 differently soldered Cartan bundles, a generalized matter-antimatter conjugation ? is established which leaves the basic current-curvature equations ?-invariant.
      
The barotropic inertial stability parameter in the eccentrically cyclogeostrophic, basic current field was derived in 2003 from a horizontal cross-stream virtual displacement of a parcel.
      
Such currents, governed by the eccentrically cyclogeostrophic equation, are adopted as the basic current field for the parcel method.
      
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In this paper,an analysis is made on the structure of the July meanflow field at 850 mb,700 mb,500 mb over the continent of Asia during theyear 1951—1955 and the mean contours at 200 mb over Asia for July andAugust,1956.The vertical cross-sections of the mean flow and temperaturefields along 75°E,90°E,105°E and 120°E for July and August,1956 havebeen constructed.The three-dimensional flow structure over continent ofAsia is constituted of the following three basic currents:(1) the westerliesof middle latitudes,(2)...

In this paper,an analysis is made on the structure of the July meanflow field at 850 mb,700 mb,500 mb over the continent of Asia during theyear 1951—1955 and the mean contours at 200 mb over Asia for July andAugust,1956.The vertical cross-sections of the mean flow and temperaturefields along 75°E,90°E,105°E and 120°E for July and August,1956 havebeen constructed.The three-dimensional flow structure over continent ofAsia is constituted of the following three basic currents:(1) the westerliesof middle latitudes,(2) the upper level tropical and subtropical esterlies,and (3) the south-westerly monsoon under the upper level tropical andsubtropical easterlies.Moreover,the changes of the general circulation over Asia in thetransitional period between spring and summer,1956 is also investigated.It is found that a leaping change of the general circulation over Asiaoccurs during this period.The upper level subtropical ridge was establis-hed over the latitude of Tibet,and over south Asia (to the south of 12°N)an high level easterly jet-stream was established.At the same time,thesouth-westerly monsoon of India and the “Meiyu” (plum rain) season ofthe Yangtze valley set in.The authors also found that the northwarddisplacement of the rain belt is closely related to the northward retreatand the accompanying weakening in intensity of the westerlies over Chinamain land.

作者分析了1951—55时期中850、700及500毫巴的7月平均气流场的构造,以及1956年7、8两月亚洲上空200毫巴平均等高线图.又作了1956年7、8两月东经75度、90度、105度和120度经线上平均风场和温度场的剖面.我们发现,在夏季有三种基本气流组成亚洲大陆上空三度空间的气流场:即,(1)中纬度的西风气流,(2)高空热带和副热带的东风气流,(3)位于高空热带和副热带东风气流下面的西南季风.此外,对于1956年从春季到夏季的过渡时期中,亚洲上空大气环流的转变,亦作了研究.我们发现,从春季到夏季的过渡时期中,亚洲上空的大气环流有着一个跳躍的转变.在这个时期中,喜马拉雅山南边的高空副热带西风急流向北撤退,在西藏高原的纬度上空,建立一个副热带高压脊线,并且在亚洲南部上空(北纬12度以南)建立一支高空东空急流.同时印度的西南季风和我国长江流域的梅雨时期开始出现.作者又发现,夏季在中国大陆上,雨带的北移和西风带北撤以及相应的西风带强度的削弱有着密切的联系.

With linear two-layer model the development and movement of long waves in the upper and lower part of the troposphere are studied. The main results are:1. The usually used synoptic rules——the disturbance develops when the pressure wave preceeds the temperature wave——is valid only in upper troposphere for ultra-long waves (with wave length of about 10~4 km or larger), valid from middle troposphere upward for long waves of wave length of about 7000 km and valid for whole troposphere for long waves of comparatively...

With linear two-layer model the development and movement of long waves in the upper and lower part of the troposphere are studied. The main results are:1. The usually used synoptic rules——the disturbance develops when the pressure wave preceeds the temperature wave——is valid only in upper troposphere for ultra-long waves (with wave length of about 10~4 km or larger), valid from middle troposphere upward for long waves of wave length of about 7000 km and valid for whole troposphere for long waves of comparatively shorter wave length.2. In the basic current with shear, the upper part of the disturbance develops while the lower part damps when the axis of the trough or ridge line tilts westward with height and the upper part of the disturbance damps while lower part develops when the axis tilts eastward with height. When the upper and lower part develop or damp simultaneously.3. The temperature wave and pressure wave may travel with different speed and their direction of movement may even reverse. In the upper as well as in the lower layer, the disturbance develops (damps) when the ridge moves into the region of divergence (convergence) or the trough moves into the region of convergence (divergence).4. The amplitude as well as the speed of movement of the disturbance varies with time. They depend not only on the structure of the basic current and the wave length bat also on the vertical structure of the disturbance as well.5. The periodically varied stable disturbances may increase or decrease in amplitude more than 250% in one day during the stage of development. Thus the ordinarily observed large variation of circulation in westerly belt may not be a phenomenon of instability.

本文利用线性两层模式討論了对流层上部和下部扰动的发展和移动,以及它們之間相互关系。有以下主要結果: 1.一般常用的“溫度波落后于气压波,扰动发展”这一規則,对于超长波(波长大于10000公里)只适用于对流层上部,对于波长为7000公里左右的长波自对流层中部以上皆可应用,对于較短的长波整个对流层皆可应用。 2。当槽线或脊线随高度向西傾斜时,扰动的上层发展,下层阻尼;向东傾斜时,上层阻尼,下层发展;当时,上下层同时发展. 3.溫度波和高度波的移速可以不同,甚至方向可以相反;无論在上层或下层,当脊移进輻散区或槽移进輻合区时,扰动发展;当脊移进輻合区或槽移进輻散区时,扰动阻尼. 4.扰动的振幅和移速随时間而变,它不仅决定于基本流場的参数和扰动的波长,同时决定于扰动本身的上下結构. 5.周期性变化的稳定波在发展时期,其振幅的发展一天可达两倍半以上.因此日常所观測到的环流的巨大变化是否都属于一般所謂的西风带不稳定的現象值得深入研究.

In this paper the process how an unstable growing disturbance stops developing is investigated. The main mechanism to check the development is the feeding-back effect of the unstable disturbances on the basic current. It is shown that the time elapsed for an unstable disturbance to grow to its maximum intensity is roughly proportional to its initial amplitude. For an amplitude of 100 meters the time is about 8 days, and that for an amplitude of 200 meters is about 5 days. Further, in the vorticity and...

In this paper the process how an unstable growing disturbance stops developing is investigated. The main mechanism to check the development is the feeding-back effect of the unstable disturbances on the basic current. It is shown that the time elapsed for an unstable disturbance to grow to its maximum intensity is roughly proportional to its initial amplitude. For an amplitude of 100 meters the time is about 8 days, and that for an amplitude of 200 meters is about 5 days. Further, in the vorticity and thermodynamic equations we keeped the non-linear terms which are generally dropped. This enables us to study the mutual interaction of the disturbances. It is shown theoretically that this mutual interaction is important in the formation of Ω-shaped blocking highs.

本文討論了已經不稳定的扰动如何停止发展。扰动对基本气流作非线性的反馈,使扰动不再能从基本流場得到能量(位能或动能),于是扰动停止发展。在求解扰动涡度方程时,从略去非线性項的解作为第一近似的解代入非綫性項,重新解扰动方程,得到第二近似的解。在起始不长的时間內,第一近似已足够准确,然而时間稍长,則非线性項的訂正起重要的作用,它可以基本上改变了第一近似流場的形式,出現了閉合的高中心及Ω形流場。

 
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