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相对衰减
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  relative attenuation
     The results show that the mixed microstructures of 30Mn2SiV steel for D grade sucker rod can be identified by using ultrasonic relative phase velocity and relative attenuation coefficient methods.
     结果表明,利用相对相速度和相对衰减系数能够对D级抽油杆用钢30Mn2SiV多相混合组织进行无损识别。
短句来源
     The signal'snormalized spectra of three kinds of specimens of 30Mn2SiV Steel are compared according to the principle of spectral analysis technique, and relationships between ultrasonic parameters (relative attenuation coefficient and relative phase velocity) which have been calculated by phase and magnitude spectrum and three kinds of multi-phases mixed microstructures are investigated.
     依据频谱分析的原理将采集到的信号在频域内进行了功率谱归一化比较,并借助于谱分析技术所得到的相位谱和幅度谱,研究了具有不同珠光体含量和形态的粒状珠光体+片状珠光体+铁素体、片状珠光体+铁素体以及上贝氏体+片状珠光体+铁素体三类样品的多相混合组织状态与相对相速度和相对衰减系数之间的关系。
短句来源
     Actual tests verified that almost no error could be found even when the relative attenuation reached 70 dB.
     实验证实即使被测相对衰减达到70dB,仍未发现误差。
短句来源
  “相对衰减”译为未确定词的双语例句
     Multinomial Regression proce- dure showed that GSLS/GSLD、GSLS/GSK were most correlated with liver function.
     多元回归分析显示,相对衰减程度 GSLS/ GSLD、GSLS/GS 与肝功能关系最大。
短句来源
     A TENTATIVE DISCUSSION ON "RELATIVE DECAYTIME METHOD" FOR WATER PROSPECTINGIN MOUNTAIN AREAS
     山区找水的“相对衰减时法”探讨
短句来源
     The study shows that using a obtained from cylindrical surface of column can characterize the alloy steel samples, which have complicated phase structure.
     研究表明,通过比较圆柱面法测得的相对衰减系数,能够对具有多种相结构的较大尺寸合金钢试样进行超声表征。
短句来源
     2.The relative attenuate rate of intensity level of geo-sound signals transmitted into a hole through a sand layer 30 cm thick shows some decrease as compared with attenuatim in sand of the same depth, and it is related to the fundamental characteristics of the geo-sound signal.
     2.地声信号透入30cm沙层内的洞穴中,洞内声压级的相对衰减率与同深度沙层内相比较,呈现一定的下降现象,并与地声信号的基本特性有关。
短句来源
     The image reconstructed by using the new technique is 2-D distribution of the relative attenuations in subsurface media, the resolution and stability of which seems to be better and to be more favourable to geological interpretation than that of absolute attenuations reconstructed by using the traditional one.
     新方法重建的地下介质相对衰减的二维分布图象,比传统方法重建的绝对衰减的二维分布图象具有更好的分辨力和稳定性,更有利于地质解释.
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  相似匹配句对
     Theory of Relativity & Theory of Relative Absoluteness
     相对绝对论
短句来源
     THE STUDY OF RELATIVE COULOMETRIC TITRITION
     相对库仑滴定法
短句来源
     A TENTATIVE DISCUSSION ON "RELATIVE DECAYTIME METHOD" FOR WATER PROSPECTINGIN MOUNTAIN AREAS
     山区找水的“相对衰减时法”探讨
短句来源
     Attenuation: 2;
     衰减2;
短句来源
     The model of attenuation could be expressed by an exponential equation.
     光辐射相对能量衰减可用一指数方程表示
短句来源
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  relative attenuation
Nothing has to be known about its properties, since relative attenuation data are used for evaluation only.
      
The relative attenuation of self-stimulation, eating and drinking produced by dopamine-receptor blockade
      
It is shown that the relative attenuation increases remarkably for the frequency range of 5 to 10 Hz.
      
A continuous relative attenuation of the order of 6-14% is due to presence of fine dust particles and pollutants throughout the year in the lower atmosphere at Quetta.
      
Our results indicate an increased difference in the relative attenuation of global solar radiation for winter when compared with summer due to combustion of natural gas and mined coal for heating of buildings.
      
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In this paper we further discuss the reverse shock wave model that was suggested by Mckee in 1974. Mckee's formula about the propagation of the reverse shock wave is improved. Finally, we discuss the influence of the reverse shock wave on the evolution of young supernova remnents. The conclusions are: 1. The temperature of the shocked gas behind the reverse shock wave will be increased progressively. The thermal X-ray luminosity emitted by the gas will be decreased. For example, the relative increment of the...

In this paper we further discuss the reverse shock wave model that was suggested by Mckee in 1974. Mckee's formula about the propagation of the reverse shock wave is improved. Finally, we discuss the influence of the reverse shock wave on the evolution of young supernova remnents. The conclusions are: 1. The temperature of the shocked gas behind the reverse shock wave will be increased progressively. The thermal X-ray luminosity emitted by the gas will be decreased. For example, the relative increment of the temperature is about 1% and relative decrement of the luminosity is about 0.2—0.3% every year for Cas A. 2. The relative decrement of the radio radiation in young supernova remnants will be further decreased under the influence of the reverse shock wave. Shklovsky (1960) has predicted a decrement of luminosity of 1.7% every year for Cas A, but the observational value is about 1%. The difference between the two values can better be explained when the influence of the reverse shock wave on SNR's evolution is taken into account.

本文探讨年轻超新星遗迹演化的影响,对Mckee提出的逆激波模型做了进一步讨论,改进了逆激波传播的F值公式。本文的结论有:(1)逆激波所扫过的膨胀壳气体温度递增,总的X辐射光度递减。(2)SNR 射电流量的相对衰减率由于逆激波存在而减小,由此解释了仙后座A(Cas A)射电流量的年递减率理论预言值和观测值之间的差异。

A simple, rapid, directly observable method for examining the supporting rod type attenuator's matching property is discussed. The fundamental principle employed is to measure and work out the relative attenuation distribution curve of the attenuator at microwave frequencies, and then by phase shift method to measure the VSWR'S, value as an indication of matching quality of the attenuator in its region of slow variation in attenuation, compare and analyse the obtained curve and the S value in order to determine...

A simple, rapid, directly observable method for examining the supporting rod type attenuator's matching property is discussed. The fundamental principle employed is to measure and work out the relative attenuation distribution curve of the attenuator at microwave frequencies, and then by phase shift method to measure the VSWR'S, value as an indication of matching quality of the attenuator in its region of slow variation in attenuation, compare and analyse the obtained curve and the S value in order to determine required form of the curve and slope of the starting section. When these are established, in further examination work on attenuators all one needs to do is just to measure and work out an attenuator's microwave relative attenuation distribution curve to sec if it meets the requirement established. By adopting this method, one increases greatly the rapidity of measurement. From experimence, we can say that this method is not only useful in the development research work on TMT, but is useful on a small scale manufacturing of TMT's.

本文介绍一种简便、快速、直观的检验支撑杆型衰减器匹配性能的方法。它的基本原理是在微波频率上测绘被测衰减器的相对衰减量分布曲线,再用相移法测量反映衰减器渐变段匹配程度的电压驻波比S,对比分析所得曲线和S值,确定对曲线的形状及其起始段斜率的要求。此要求确定后,在检验衰减器时,只需测绘它的微波相对衰减量分布曲线看是否符合要求即可。采用这种方法大大提高了测试速度。实践证明,这种方法不仅在研制行波管中起了一定作用,还可以作为小批量生产工艺流程中检验衰减器的有用手段。

In this paper the attenuation characteristics of 8 recorded premonitory geo-sound signals of earthquakes in sand layer is measured, and the effect on the metabolic process of 5-hydroxytryptamine (5-HT) in the brains of mice is analysyed. The results are as follow:1.The forms of the attenuation characteristics of 8 geo-sound signals in sand layer are basically similar, showing that geo-sound signals have almost the same fundamental characteristics. The attenuation is obviously related to frequency within the...

In this paper the attenuation characteristics of 8 recorded premonitory geo-sound signals of earthquakes in sand layer is measured, and the effect on the metabolic process of 5-hydroxytryptamine (5-HT) in the brains of mice is analysyed. The results are as follow:1.The forms of the attenuation characteristics of 8 geo-sound signals in sand layer are basically similar, showing that geo-sound signals have almost the same fundamental characteristics. The attenuation is obviously related to frequency within the frequency bands of 50-100 Hz and 250-630 Hz, but attenuation is relatively uniform in the dominant band of 100-250 Hz, that is, the absorption coefficient of a sand layer with a thickness of 20-30 cm is about 4×10-2- 6×10-2 dB/cm within this band.2.The relative attenuate rate of intensity level of geo-sound signals transmitted into a hole through a sand layer 30 cm thick shows some decrease as compared with attenuatim in sand of the same depth, and it is related to the fundamental characteristics of the geo-sound signal. Within the dominant band, single tumbling sound, continual sound of "roasting beans" and so on, and blast sound drop 4.4±0.8=, 3.5±0.3% and 3.0±0.2% respectively, but the drop in intensity of coninuous sound of snare drums is not obvious.3. Two groups of mice quiet adaptation of 48 hours are exposed for 30 minutes to random geo-sound signal noise of 105-85 dB and of 76-66 dB respectively. It was found that the accumulative volume of 5-hydroxyindole-3-acetie acid (5-HIAA), that is, the metabolite of 5-HT in the centre of both groups increases respectively 24.7% and 262.2% as compared with animals of the contsrol group.These results show that the spectrum characteristics of geo-sound with premonitory property transmitted into the ground is related to the absorption characteristics of the ground medium, and it is the stimulation by low frequency noise that makes the animals feel very uneasy. Though the dominant band of geo-sound transmitted into hole is obviously lower than the sensitivie band of hearing of mice. It may directly effect the metabolic process of 5-HT in the brains of mice. Moreover, "acoustic effect of the hole" may raise the ability of animals to distinguish sound signals above the noise background. It may be seen that geo-sound with premonitory property may be an important factor which causes the abnormal behavior of animals living in holes, eg. mice, prior to the occurrence of earthquakes.

本文对八个前兆性地声信号在沙层中的衰减特性,及其对鼠脑中5-羟色胺(5-HT)代谢的影响,进行了测量分析。主要结果如下: 1.八个地声信号在沙层中的衰减特性的图象基本相似,其基本特征相同的具有明显的一致性。50—100Hz和250—630Hz内的衰减与频率明显有关,100—250Hz的优势频段内的衰减比较平缓,该频段内20—30cm沙层的吸收系数为4×10~(-2)—6×10~(-2)dB/cm。 2.地声信号透入30cm沙层内的洞穴中,洞内声压级的相对衰减率与同深度沙层内相比较,呈现一定的下降现象,并与地声信号的基本特性有关。在优势频段内,单次性轰隆声、连续性“炒豆”声等和刮风声分别下降4.4±0.8%、3.5±0.3%和3.0±0.2%,连续性小鼓声的下降不明显。 3.静适应48小时的小白鼠,同时分别在105—85dB和76—66dB的地声信号的随机组合声中暴露30分钟,其脑内5-HT的代谢产物5-羟吲哚乙酸(5-HIAA)的含量分别比对照组增高24.7%和26.2%. 这些结果表明,前兆性地声波透入地表的频谱特征与介质的吸收特性有关。此时透入洞穴内的地声波,其优势频段虽然明显低于鼠的听觉敏感...

本文对八个前兆性地声信号在沙层中的衰减特性,及其对鼠脑中5-羟色胺(5-HT)代谢的影响,进行了测量分析。主要结果如下: 1.八个地声信号在沙层中的衰减特性的图象基本相似,其基本特征相同的具有明显的一致性。50—100Hz和250—630Hz内的衰减与频率明显有关,100—250Hz的优势频段内的衰减比较平缓,该频段内20—30cm沙层的吸收系数为4×10~(-2)—6×10~(-2)dB/cm。 2.地声信号透入30cm沙层内的洞穴中,洞内声压级的相对衰减率与同深度沙层内相比较,呈现一定的下降现象,并与地声信号的基本特性有关。在优势频段内,单次性轰隆声、连续性“炒豆”声等和刮风声分别下降4.4±0.8%、3.5±0.3%和3.0±0.2%,连续性小鼓声的下降不明显。 3.静适应48小时的小白鼠,同时分别在105—85dB和76—66dB的地声信号的随机组合声中暴露30分钟,其脑内5-HT的代谢产物5-羟吲哚乙酸(5-HIAA)的含量分别比对照组增高24.7%和26.2%. 这些结果表明,前兆性地声波透入地表的频谱特征与介质的吸收特性有关。此时透入洞穴内的地声波,其优势频段虽然明显低于鼠的听觉敏感区,但对鼠是一种极不适应的低频噪声刺激,可直接影响到脑内5-HT的代谢过程。同时,洞穴可增强动物对噪声背景上的声信号识别。可见,前兆性地声波有可能是引起鼠等穴居动物

 
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