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Evidence suggests that 1 under more stable stratification, the basic flow, if moving faster at low and high levels (particularly in the presence of jets there), allows a resulting meso-β unsteady wave to propagate eastward with respect to basic flow and even at greater velocity compared with it; 2 vertical windspeed shear of basic flow causes instabilities of the TWT perturbation; 3 considering the second derivative of basic-flow wind with respect to z (denoted by zz≠ 0 which is simply given as β* hereafter) the expression for the phase velocity of vortex Rossby wave is obtained, which is unidirectional in propagation with respect to basic flow; 4 VRoW has its physical origin from β*, i.e., from z-varying heterogeneities of y-direction averaged vorticity of the basic flow field; 5 VRoW phase velocity is associated with zonal wave number k, its energy is dispersive and the group velocity exists in the x direction; 6 when windspeed meets the condition of β*, TWT disturbance instability may be that of mixed VRoW and gravity wave; 7 if basic flow is subject to linear shear but does not meet the condition of β*, the TWT instability is that of inertia-gravity wave.

在大气层结比较稳定的情况下,如果基本气在低层和高层较大(有可能存在低空急和高空急),此时产生的β中尺度不稳定扰动相对于基向东传播,甚至于快速向东传播。基本气在垂直方向上的风速切变对于中尺度横波型的扰动起着不稳定的作用。如果考虑基的二次切变,可以得到涡旋Rossby波的相速度表达式,涡旋Rossby波相对于基本气是单向传播的。涡旋Rossby波产生的物理根源是基本场的风速二次切变,亦即基本场y方向的平均涡度在空间z方向上的不均匀所致。涡旋Rossby波的相速度与纬向波数也有关,它的能量是频散的,其在纬向x方向也存在群速度。在基本场的风速存在二次切变时,横波型不稳定可能是混合的涡旋Rossby重力波的不稳定;而在基本场的风速仅仅存在线性切变,不存在二次切变时,横波型扰动的不稳定则是重力惯性波的不稳定。

It is shown from the measurements obtained by Zimmermann that the flow of gas is limitedin several zones in specimen and the quantities of tracheids are equal in three grain directionsof each zone.

一个次级阻网络的阻数目接近3万,无法用通常的串并联归并方式求解它的等效阻,本文使用了实空间重正化变换的方法求解次级阻网络的等效阻。

On the basis of the existing sieving method of sieving thyratrons, serving the typical fuze detonating circuit as the circuit of sieving thyratrons, and applying the operation conditions of the typical fuze detonating circuit in the sieving circuit, we can measure more accurately the turn on voltage, trigger voltage, turn on time, and leak of electricity of the thyratrons.

在现有闸管检测方法的基础上,将实际的引信起爆电路作为闸管的检测电路,将起爆电路的工作条件施加于检验电路,可以更准确地给出闸管的导通电压、触发电压,同时测量出闸管的导通时间以及闸管在关断状态下的漏电

The sports ecosystem is a compound social ecosystem composed of person,sports and environment with characteristics of globality,arrangement of ideas,opening to the outside world,teleonomy,order,trend nature,dissipating nature and altitude artificialization;The energy flowing not only has energy stream,matter stream,information stream,but has the value stream,knowledge stream,ability stream,promotion and...

体育生态系统是一个由人—体育—环境构成的复合社会生态系统,具有整体性、层次性、开放性、目的性、有序性、动态性、耗散性以及高度人工化的特征;其能量动不仅有能量、物质、信息的传输和转化,还有价值、知识、能力的富集,并不断地促进各层次体育的发展。

According to the formation mechanism of sidestream smoke, a special cigarette paper was produced and used to control the release level of the sidestream smoke.

根据侧烟气的产生机制,一方面研究制备了一种特殊的低侧烟气卷烟纸,使侧烟气在逸出烟支燃烧线之前被吸附和分解,控制侧烟气的释放;另一方面,采用了一定量的膨胀烟丝和烟丝助燃剂,通过减少燃烧底物和使烟丝燃烧更完全来控制侧烟气的产生。

The main factors influencing the duration of preferential flow are the duration and the amount of rainfall. The duration of preferential flow is very evidently positively related to the duration of rainfall, and evidently positively related to the amount of rainfall. The main factor influencing the peak of preferential flow is the amount of rainfall, which is evidently positively related to the peak of preferential flow. The soil characteristics of different soil layers are very different, which induced the lateral preferential flow.

3降雨和土壤物理特性是影响优先的重要因子,影响优先量的主要降雨因子是降雨总量,两者呈现出极显著的正相关关系;影响优先历时的主要降雨因子是降雨历时和降雨总量,优先历时与降雨历时为极显著正相关关系,与降雨总量为显著正相关关系;影响优先峰值量的主要降雨因子是降雨总量,两者为显著正相关关系。

In view of the ill-posedness of the diagnosis problem, an effective measure is adopted to make it well-posed. Then the diagnosis problem is transferred into a variational problem which is solved by a regularization method.

&场诊断技术&是一门综合利用实验测试技术和理论计算技术,进行快速场分析和场评估,给出叶轮机械内部场详细信息和场优劣判断准则的新兴的综合技术。

Computational fluid dynamics methods were applied to obtain the static velocity distributions in the main stage channel of the valve with different structure parameters or different pressure and flow rate.

应用场数值模拟技术,在不同结构参数、压力、量等条件下,对先导式纯水溢阀主阀道内的态进行动态仿真。

In this paper, a full flow model is given for calculating the average residence time of molten steel in non-symmetry multi-strand tundish to analyze flow pattern, the model is as follow:〓 The model can be used to calculate the volume fraction of the dead area、the piston flow and the mix flow, and is satisfactorily applied to the water model of three-strand tundish of Guangzhou Steel Works to analyze the data of the experiment.

本文认为在研究中间包内高温钢水的动问题时,应该考虑钢水密度变化这个条件对钢水动的影响,这样其结果更符合实际钢水动规律。本文针对非对称多中间包,提出了全量模型计算多中间包钢水平均停留时间:〓该模型也能够很好地计算多中间包的死区、活塞区、全混区体积分数。

This paper presents a workflow management system based on software agent. It applies an activity-based modeling method and builds formal workflow model. It also puts forward an agent model composed of activity model, intention model, skill model, self-capacity model and companion model to implement workflow management. An agent federation which can be nested is constructed to enhance system flexibility and a shared domain ontology based on workflow is defined to support semantic interoperation among agents.

文章提出了一种基于软件agent的工作管理系统,采用基于活动的工作建模方法,建立了形式化的工作模型,在此基础上,定义了包括活动、意向、技能、自身能力、伙伴等模型的实现工作运行的agent模型,构建了可嵌套的agent联邦结构,增强了系统的灵活性,并定义了基于工作的共享领域本体论,支持agent间的语义互操作。

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Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时,他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了

The enrich the peopling of Deng Xiaoping of century great person thought, it is the main component in system of theory of Deng Xiaoping economy, it is a when our country economy builds basic task important facet.

世纪伟人邓小平的富民思想,是邓小平经济理论体系中的重要组成部分,是我国经济建设根本任务的一个重要方面。