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  it allows
     The new version of RIP is RIP-2. It allows packets to include such information as routing summary, classless interdomain routing, variable length subnet mask and simple authentication.
     RIP最新的增强版是RIP-2规范,它允许在RIP报文中包含路由汇总、无类域问路由、变长子网掩码等信息,并提供了简单的认证机制。
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     The benefit of this scheme is that it allows existing LAN applications to run over an ATMnetwork with no modification.
     此方案的优势在于它允许现有的LAN应用在不作任何修改的情况下,便可在ATM网上运行。
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     One characteristic of TRANSer is that it allows multiple source XML documents to map to the destination XML document which can be created or edited when designing.
     它允许多个源XML文档映射到目标XML文档,还可以在设计映射关系的同时创建和修改目标XML文档的格式。
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     Web Service is a new distributed computing technology, it allows the clients access the distant Web Service via . standard network transfer protocol(HTTP). The messages of request and response are all encoded in XML format. All these make Web Service platform-independent.
     Web服务(Web Service)是近年来出现的一种分布式计算技术,它允许客户端通过标准网络传输协议HTTP调用远程的Web服务,调用请求和返回结果都用XML进行编码,从而实现了平台无关性。
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     :The Winsock control shipped with Visual Basic is the very powerful tool. It allows implementing any Internet network protocol inside of your application.
     Winsock控件是包含在Visual Basic软件开发包中的一个强大的工具,它允许执行各种应用里面的任何因特网网络协议。
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  “它允许”译为未确定词的双语例句
     RDMA protocol is new and it permits one computer to access remote memory in another one.
     RDMA协议是一个比较新的规范,它允许一台计算机直接访问另一台计算机的内存。
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     ArcSDE is a tool that allows you to store and manage spatial data in your chosen relation database management system (RDBMS).
     ArcSDE(Spatial Database Engine)是空间数据库引擎,它允许用户用关系数据库管理系统(RDBMS)存储和管理空间数据,可以将空间数据和属性数据集成在目前通用的商用RDBMS中。
     Port forwarding, a function of OpenSSH, allows the forwarding of TCP/IP connections to a remote machine through an encrypted channel.
     端口转发是OpenSSH的一项功能,它允许通过加密的通道转发TCP/IP连接到远程机器上。
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     Middleware is software that connects applications, allowing them to exchange data.
     中间件是一种连接应用程序的软件,它允许应用程序间进行数据交换。
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     Based on the principles of a variable structure system a design method for the variable structure control system with a variety of reference inputs is proposed in this paper.
     基于变结构控制原理,本文提出了一种变结构控制系统的设计方法,它允许多种形式的参考输入。
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     Our method is popularized from R.
     是R.
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     This is an extension of W.
     是W.
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     VIDF can be implemented in different ways according to the demands of its developer.
     VIDF允许的开发者根据要求采用不同的实现方法.
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     It allows all parameters of system including the speed regulator to be changed.
     允许对系统的所有参数包括速度调节器参数进行变动.
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     ③ Backorder is introduced;
     ③允许订单积压;
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  it allows
It allows one to regenerate images with appreciable losses of their surface.
      
It allows one to describe all kinds of the right motions of some classes of controllable discontinuous systems.
      
The two-parameter case is of special importance because it allows one to make use of the graphical mathematics.
      
It allows one to construct the boundaries within a domain of integral constants that split satellite orbits into two classes depending on a possible collision with the central body due to third-body perturbations.
      
It allows one to formalize an algorithm of change from the problems of optimization to a boundary-value problem for a system of ordinary differential equations in the case of any optimization problem for which the pulse formulation makes sense.
      
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Recently, digital computers are gradually used to replace analog or hybrid computations for implement of continuous-system simulations. Digital continuous-system simulation has significant advantages: better man-machine interaction, higher accuracy and reproducibility, more convenient programming and report generation, etc.The simulation user would like to have a more convenient and flexible simulation language, in order to be as free as possible from the details of computer programming and concentrate on his...

Recently, digital computers are gradually used to replace analog or hybrid computations for implement of continuous-system simulations. Digital continuous-system simulation has significant advantages: better man-machine interaction, higher accuracy and reproducibility, more convenient programming and report generation, etc.The simulation user would like to have a more convenient and flexible simulation language, in order to be as free as possible from the details of computer programming and concentrate on his system simulations. An equation-oriented BASIC simulation language which permits the user to enter first-order differential equations in essentially unchanged mathematical form is introduced in this paper. It may run on any machine which supports BASIC. The user does not even have to be familiar with BASIC so long as he follows the simple format specified. A computing example is given to illustrate its application.

近年来,已逐渐用数字计算机代替模拟计算机或混合计算机来实现连续系统的仿真。连续系统的数字仿真的显著特点是:便于人机对话,求解精度高和重复性好,容易编排程序和输出计算结果。但是,为了避开编程序的细节和把精力集中在系统仿真上,系统仿真者希望有一个方便和灵活的仿真语言。本文介绍一种面向方程的BASIC仿真语言,它允许用户直接用一阶微分方程组的数学表达式写入,并能在任何一台配置BASIC语言的数字机上运算。使用时只要遵循规定的简单格式而不用去熟悉BASIC语言的细节。文中附有阐述用法的计算实例。

In this paper, a new method for analysing the emission lines of solar prominences is presented. The main feature of this method is that the total optical depth (τ0), the Doppler width (ΔλD), and the factor of the change of the source function (α) are determined simultaneously by fitting the observational profile, adopting a changeable source function, and using non-linear least-square method.I. Fundamental MethodIf the source function changes linearly with optical depth, the theoretical profile shown in formulae...

In this paper, a new method for analysing the emission lines of solar prominences is presented. The main feature of this method is that the total optical depth (τ0), the Doppler width (ΔλD), and the factor of the change of the source function (α) are determined simultaneously by fitting the observational profile, adopting a changeable source function, and using non-linear least-square method.I. Fundamental MethodIf the source function changes linearly with optical depth, the theoretical profile shown in formulae (2)-(5) can be derived. Only if a>0, i.e. source function increases toward the center of a prominence, can the self-reverse profile appear. Therefore, the conclusion that the source functions of the Hα lines decrease toward the centers of the prominences, suggested by Jefferies and Orrall, and Stellamacher, should be reconsi-dered. The dependence of the theoretical profile on line parameters, as shown in formulae (7)-(9), is very complex. The ordinary linear least-square method can not be used for observational profile fitting. But, we can give parameters τo, Δλd and a a preliminary estimation by matrix T. The errors between the theoretical and the observational profiles under such a preliminary estimation are expressed by matrix DX. It is easy to get the least-square solution of parameter correction DY by fitting the observational profile, as equation (11) shows. Then, the best estimation of parameters, Y can be derived. Because the dependence of the profile on each parameter is far from linear, in fact, the above process of finding the solution must be repeated until further correcting does not reduce the errors between the theoretical and the observational profiles. The whole process is done by computer.Ⅱ. Main EesultsThe fundamental analyses of the observational profiles of early Balmer lines for ten prominences presented by Ye Shihui are shown in Table l. There, M is the number cf observational points, S is the square sum of errors between the theoretical and the observational profiles. The comparison between the theoretical and the observational profiles are shown in Pig. 1 a-e for prominence four. The results of the analyses of the Hα lines are shown in Table 3 and Fig. 3 a-j from no self-reverse lines through weak self-reverse lines to deep self-reverse lines. From these results the following conclusion can be drawn.1. Ignoring the change of the source function will seriously affect the determination of total optical depth for thick lines, especially for Hαlines; but the supposition of the constant source function is acceptable for most Balmer lines except for Hα and Hβ. The total optical depth will be over-estimated if the increase of the source function toward the center of a prominence is ignored; the total optical depth will be underestimated if the decrease of the source function is ignored.2. Extinction by self-absorption also bears a relationship with the change of the source function. When the source function increases towards the center of a prominence, extinction by self-absorption will be stronger; vice versa, extinction will be weaker. We have re-estimated the extinction by self-absorption for early Balmer lines. The results are shown in Table 2. Although it is not the thickest and brightest, the sixth prominence has the strongest extinction by self-absorption because of bigger a. The total energy of the Hα line for this prominence has been reduced by a factor of 14.27. It seems that Unsold under-estimated the effect of self-absorption, while Ye Shihui over-estimated the effect.The formulae (13-17) can be used for determining the theoretical extinction by self-absorption if radiation damping is ignored.3. The source functions of self-reverse Ha lines increase toward the centers of the prominences. The source functions in the center are 1.2-2.5 times those on the boundary. When the total optical depth is not very thick, as in prominence 8, the self-reversion can not appear, although the source function increases toward the center of the prominence. With the increase of TO and a, t

本文提供了日珥发射线光谱分析的一种新方法。它允许源函数随光学深度变化,采用非线性最小二乘拟合,直接从观测轮廓同时确定线心光学厚度τ_0、Doppler宽度△λ_D和源函数变化因子α。 本文用这个方法给出了对文献[1]十个日珥早 Balmer 线的分析结果。这些结果表明,自反变H_α线源函数向日珥内增加,中心源函数是边缘的1.2~2.5倍;忽略源函数的这种变化,将使H_α线τ_0的确定明显偏大;日珥的自吸收减弱亦与源函数变化有关。 对日珥源函数变化的讨论,支持关于日珥辐射激发的主要机制是散射太阳入射辐射的论点。

MDMS is a data management system designed especially for medical and chemical application. In addition to the usual data manipultation functions (insettring, retrieval, update and sorting), many application functions such as statistics, calculation, data coavertion, link to other programs etc., were also provided. Retrieval function was expanded to fulfill multi-keys and multi-criteria Boolean search. A new data type-triple value-was developed to store numerous clinical symptoms and signs. Using MDMS, several...

MDMS is a data management system designed especially for medical and chemical application. In addition to the usual data manipultation functions (insettring, retrieval, update and sorting), many application functions such as statistics, calculation, data coavertion, link to other programs etc., were also provided. Retrieval function was expanded to fulfill multi-keys and multi-criteria Boolean search. A new data type-triple value-was developed to store numerous clinical symptoms and signs. Using MDMS, several medical and chemical data bases had been established on micro or minicomputers. Four research projects are carried on smoothly using these data bases. MDMS fulfilled most of their requirements.

医学数据管理系统MDMS采用关系方法建立数据模型。MDMS第一版首先在CBM4000上实现,后移植蓟CBM8000及TRS—80上,采用BAS1C语言编写,用于定长记录。MDMS第二版在小型机PDP11/44上实现,它允许变长记录;由于使用了倒排文件,因此2加快了多码检素时的查找速度。同时也由于编译成机器语言程序。从而提高了运行速度。MDMS具有插入、检索、修改、删除,显示键目录、排序、数据转换计算及调用应用程序等九项功能,并兼顾了医学及化学应用方面一些特点。利用MDMS,建立了几个小型专用的科研数据库:黄疸数据库、胃脘痛数据库、心肌梗塞数据库、甲亢数据库、以及化学药品数据库。利用黄疸及胃脘痛数据库,完成了《黄疸会诊程序JDD1及JDD2》及《电子计算机模拟名老中医梁乃津的胃脘痛经验程序UAP·CAD》两项科研项日。MDMS-2已移植至IBM-PC及APPLE II+机上。

 
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