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各种频率
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  various frequency
     The main content of this paper:Firstly,the basic theory and characteristics of various frequency synthetic technologies and the mixed frequency synthetic technology of DDS+PLL have been introduced,and the method to expand frequency bandwide has been analyzed and compared.
     本文的主要内容:首先介绍了各种频率合成技术的基本原理和特点,以及DDS+PLL的混合频率合成技术,并对扩展频带的方法进行了分析和比较。
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     In the paper, the way of detection of signal based on wavelet transform is researched, it analyses and processes signal of the various frequency at different scales.
     对基于小波变换的信号检测方法进行了深入的研究 ,在不同尺度上分析和处理信号的各种频率成份。
短句来源
     The results show that resistivity of the films under the various frequency are approximately consistent with a pure C_(60) film, but the permittivity varied with the frequency for the pure C_(60) film is obviously distinguished from the composite films.
     这些结果表明:在各种频率下的此类复合膜的电阻与纯 C_(60) 膜基本一致,但是纯 C_(60)膜随频率变化的电容率与复合膜明显不同。
短句来源
     Firstly, the thesis discusses the development of frequency synthesis techniques and compares the features of various frequency synthesis methods.
     本文首先论述了频率合成技术的发展,比较了各种频率合成技术的特点,并重点介绍了直接数字频率合成技术的现状和发展趋势。
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     After complex geotechnical media dissemination, blasting seismic waves contain various frequency components of the interferential wave, because of stacking of the interferential wave, blasting vibration analysis to the frequency characteristics of signals have became very difficult.
     爆破地震波经过复杂的岩土介质传播后,往往存在着各种频率成分的干扰波,由于干扰波的叠加,给分析爆破震动信号的频率特征带来种种困难。
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  “各种频率”译为未确定词的双语例句
     In the paper are studied the way of the detection of signals based on wavelet transform and its analysis and processing of signals of various frequencies at different scales.
     研究了基于小波变换的信号检测方法及它在不同尺度上分析和处理信号的各种频率成份 .
短句来源
     On the basis of design of DDS utilizing FPGA, it presented a method of realizing the altitude modulation by generating the main wave and the modulation wave respectively, and the frequency modulation by changing frequency tuning word of main DDS.
     在利用FPGA实现DDS的基础上,使用两路DDS分别产生主波形和调制波形,方便地实现两个任意波信号的幅度调制; 同时,通过调制波形数据实时控制主DDS的频率控制字,用数字的方法直接实现波形的各种频率调制。
     On the basis of design of DDS utilizing FPGA, it presented a method of realizing the altitude modulation by generating the main wave and the modulation wave respectively, and the frequency modulation by changing frequency tuning word of main DDS.
     在利用 FPGA实现DDS的基础上 ,使用两路 DDS分别产生主波形和调制波形 ,方便地实现两个任意波信号的幅度调制 ; 同时 ,通过调制波形数据实时控制主 DDS的频率控制字 ,用数字的方法直接实现波形的各种频率调制。
短句来源
     So, varied frequency plan and anti-interference technique have been used to improve the efficiency of wireless frequency,this pape mainly introduce the 1*3 cell frequency plan solution with an example.
     为 此,各种频率计划及相关的抗干扰技术应运而生来进一步提高频率复用度,本文将重点阐述 应用于联通GSM900的1*3紧密复用频率计划解决方案及具体应用。
短句来源
     The author measured the electromagnetic fields distribution of the transmissionlines, which have trees and buildings under the lines. The results showed that the treesand building have the ability of shield, especially for the power frequency electric fields,100k~3GHz RF electric fields, 100k~30MHz and 30MHz~1GHz RF magnetic fields,degrade 1~2 orders.
     论文对于输电线路下方有房屋与树木时进行的现场测量,结果显示房屋与树木对各种频率段内的电磁场都有屏蔽作用,尤其对工频电场、100k~3GHz 射频电场、100k~30MHz 和30M~1GHz 射频磁场的屏蔽作用相当好,基本都降低1 个到2个数量级;
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  相似匹配句对
     THE RELATIVE FREQUENCIES OF THE VARIOUS STROKETYPES OF THE CHINESE IDEOGRAMS
     汉字的各种笔画的使用频率的估计
短句来源
     So all kinds of frequency compensation technologies will be involved.
     各种方式的频率补偿技术涉及其中。
短句来源
     X—Band Microstrip Low Noise Frequency MuItiplier
     频率指示器
短句来源
     FREQUENCY
     生死频率
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     Complications were not found.
     无各种并发症 ;
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  various frequency
Reflection of individual typological features in the structure of spatial interaction of EEG waves of various frequency ranges
      
We discuss the correlations between the luminosities of radio pulsars in various frequency ranges and the magnetic fields on the light cylinder.
      
Various frequency-analysis methods were applied to the data series at 3737 and 5092 ?, where the light from the hot component made an appreciable contribution.
      
A bifurcation diagram revealing the types of magnetization dynamic states is constructed in various frequency intervals.
      
It is found that various frequency ranges differ in the property of stationarity.
      
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The present study was undertaken with one dog, on whose cortex, at the region of the sigmoid gyrus, were imbedded two permanent electrodes known respectively as electrode A and electrode B. Under stimulation, electrode A gives movement of the left hind leg, and electrode B elicits movement of the toes of the left front leg.The main aim of the experiment is to determine the minimal strength in voltage for eliciting the first appreciable motor response, when the frequency of the stimulating current is under control....

The present study was undertaken with one dog, on whose cortex, at the region of the sigmoid gyrus, were imbedded two permanent electrodes known respectively as electrode A and electrode B. Under stimulation, electrode A gives movement of the left hind leg, and electrode B elicits movement of the toes of the left front leg.The main aim of the experiment is to determine the minimal strength in voltage for eliciting the first appreciable motor response, when the frequency of the stimulating current is under control. With an ordinary audio-oscillator to administer the stimulus frequencies, the range of frequencies utilized is 20—20,000 cycles.For the same frequencies, the minimal voltage for eliciting the motor response varies considerably from one sitting to another (see Table 1), but within the same sitting the same frequencies, even when repeated with many other frequencie intervening, require closely similar minimal voltages. Furthermore, a clear trend is always present in the relationship between the frequency of the stimulating. current and the minimal voltage necessary for eliciting the motor response, i. e., within the range of frequencies used (20—20,000), the middle frequencies need farsmaller stimulus strength in voltage than either the lower or the higher ones to elicit the same motor response.It was found that the minimal effective voltage is lowest for the 300—1,000. cycles region. Frequencies lower than 300 or higher than 1,000 need higher voltage. Furthermore, frequencies from 300 downwards and from 1,000 upwards are accompanied by progressively higher voltage. Electrodes A and B yield closely similar results (see Table 3 and Fig. 2). Thus, the frequencies from 300 to 1,000 cycles may be considered as possessing the most effective stimulus value.Besides the definite frequency-voltage relationship just mentioned, frequency affects the type of motor response as that frequencies of 100 and below 100 no longer elicit the regular response of the leg or the toes alone, but give rise to neck. movement in addition. Neck movement becomes eventually the only motor response to frequencies 50—20. With electrode A the above mentioned phenomenon. appeared with great regularity (see Table 4).When the experiment was over, the dog was killed and its brain examined histologically. It is seen that both electrodes are in the sigmoid gyrus of the right hemisphere, but they enter into different depths. Electrode A penetrates into between layer Ⅴ and layer Ⅵ, while electrode B penetrates only into layer (see Figs. 4 and 5).

在本实驗中在一只小狗的乙狀回皮質中埋了兩个固定的电極,分別地利用这兩个电極,在狗的正常狀态下,試驗了各种頻率的电流,發現中間頻率(300—1000周)的电流引起运动反应所必需的电压最低,自300周以下和1000周以上,引起运动反应的最 低伏特值逐步增加。 实驗还証明,直接作用于乙狀回皮質上一定点的电流当其頻率降低到某种程度时,可以使运动反应的性質改变。

This paper attempts to answer the following two questions: (1) Is it possible to derive the law of distribution of hydrological frequency theoretically(2) What type of distribution curve should be adopted as the model of hydrological frequency curve and how to determine their parameters? The results obtained may be summarized as follows: 1. Hydrological phenomena are time series with concealed periodic fluctuations. The results from statistical analysis based upon the current assumption that hydrological phenomena...

This paper attempts to answer the following two questions: (1) Is it possible to derive the law of distribution of hydrological frequency theoretically(2) What type of distribution curve should be adopted as the model of hydrological frequency curve and how to determine their parameters? The results obtained may be summarized as follows: 1. Hydrological phenomena are time series with concealed periodic fluctuations. The results from statistical analysis based upon the current assumption that hydrological phenomena are independent stochastic variables should be accepted with due considerations. 2. In view of the regional nature of hydrological phenomena, the current parctice of analyzing samples taking from a single station only is, in effect, to narrow the sampling field arbitrarily from a larger area to a point, thus reducing the accuracy of the statistical results. Hence, the synthetic utilization of the data of all stations within the hydrologically homo- geneous region is an important measure to increase the accuracy of statistical analysis. 3. The belief that the flood frequency obeys the binomial theorem or Poisson's theorem is but to mix up the priori with the empirical probability problem. The binomial theorem, being a powerful weapon to deal with the problems of priori probability, has not been adquately and properly utilized in the hydrologieal frequency analysis. 4. Analyses have been made of the nature of distribution of shydrologieal series on the basis of Kaptyen's derivation of the skew distribution, which indicate: (1) That the theoretical interpretation of the log-probability law of the hydrologic phenomena by V. T. Chow is not sound; (2) that hydrologic phenomena being results of very complicated meteorological and hydrological processes, it is impossible to derive theoretically the law of distribution for the hydrological series. 5. The view that the flood frequency obeys the Gumbel's distribution is theoretically not sound and also not verified by actual data. 6. According to the nature of the mathematical treatments applied, the method of description of the empirical probability can be classified into three systems: (1) The methods of the generalization of the characteristic factors of the distributions, such as Pearson's curves, Goodrich's curves, etc.; (2) The methods of the modification of a fundamental distribution by series and polynomials, such as Gram-Charlier curves. curves, etc.; (3) The methods of transformed functions, such as the log-probability law, curves, etc. It should be remarked that not only Pearson's and Goodrich's curves are frequency curves of empirical nature, but even the theoretical laws, such as the normal law and the log-probability law, will be aceepted as curves of empirical nature, when used as models for empirical probability problem. 7. Hydrological frequency analysis should not be mystified and made absolute. Instead of free selections, the models of hydrological frequency curve should be uniquely selected and specified. Statistical parameters should be determined not solely by the short period data of single station, but also by the synthetic utilization of the data of possible more stations. 8. It is recommended that one of the two types of distribution, i.e. the log-normal frequency curve with both sides limited and the Pearson's type Ⅲ curve, may be selected as unified models. The author suggests that the K-value corresponding to recurrence intervals of say 10~4, 10~5, or 10~6 years may be selected as the upper and lower limits for the log-normal curve. For Pearson's type III curves, C_s should be treated not as independent but as dependent variables of C_v. 9. The proper way to select and determine the model frequency curve is to see whether it fits well with the actual data of grouped stations (stations to be grouped by regions for rainfall data and by C_v for runoff data) and the reasonableness of the extrapolating part. 10. Suggestions on the method of determination of x and C_v: For point rainfall, iso-x map may be utilized, and the mean C_v for each hydrologicregion may be adopted in order to minimize the errors from single stations and to avoid the discrepancies in results obtained from the same region. With regard to flood frequency analysis, flood mark reconnaissance must be utilized to determine the magnitude and the recurrence interval of the unusual flood. The x and C_v values of the floods and runoffs of hydrologically similiar river basins may be compared. Besides, the reasonableness of the results of frequency calculations as well as of the statistical parameters adopted therein may be checked by comparing runoffs and point-rainfall values of the same frequency.

我国近期水文频率计算方法的研究工作在选择方法,经验频率公式,参数的误差和利用我国水文资料检验各种频率线型等方面有了一定的成果和实用的结论[1],但是下面两个问题还没有获得解决: (1)能否从机率理论证明水文频率属于何种分布律? (2)水文频率曲线应当采用什么线型?如何确定参数?本文试图解答以上两个问题。本文分析了水文系列的时序性质和区域性质,把机率问题按先验、极限和后验三种基本性质对水文频率问题进行了分析;利用开布屯推导偏态分布的方法分析了水文系列的分布性质,并从而批判了有关水文频率肯定属于对数正态律,耿贝尔极限律或二项式定理等等说法。认为属于后验机率性质的水文频率,不能从机率理论证明它属于何种分布律。最后提出联合利用各站水文资料来选择线型和确定参数的方法,并建议在两端有限对数正态和皮尔逊Ⅲ型两种线型中选择一种作为统一采用的线型,对两端有限曲线提出了简易可行的确定上下极限的方法,对皮尔逊Ⅲ型曲线认为应该把Cs作Cv的倚变参数。

In this paper a method is proposed for the construction of the D-decompositioncurve for an element or a part of a linear control system to determine its stability. Forvarious frequency responses of the element or part, the relative number of roots of thecharacteristic equation with a negative real part can be determined by this method.Methods of using the D-decomposition curves to judge whether all the roots of the charac-teristic equation possess a negative real part are also discussed. It is illustrated in...

In this paper a method is proposed for the construction of the D-decompositioncurve for an element or a part of a linear control system to determine its stability. Forvarious frequency responses of the element or part, the relative number of roots of thecharacteristic equation with a negative real part can be determined by this method.Methods of using the D-decomposition curves to judge whether all the roots of the charac-teristic equation possess a negative real part are also discussed. It is illustrated in thelast part of the paper that the proposed method can sometimes be employed together withthe describing function method to solve the stability problem of a system with single-valued, nonlinear elements.

文中提出了对线性自动调节系统的一个环节或一个组成部分进行D-域分划的方法。利用这种方法可以判定当该环节或该部分具有各种频率特性时系统特征方程的负实部根的相对数目。文中也提出了利用分划曲线来判定系统特征方程具有全部负实部根的方法。在本文的后一部分,以一个具体系统为例,说明所提出的方法有时可以和谐波平衡法结合使用,以解决含有单值非线性元件的系统的稳定问题,文中列有计算结果与实验数据。

 
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