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attenuation rates
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  衰减率
     Numerical results show that, if the frequency and effective radiation power(ERP) of the HF waves are 5MHz and 100MW respectively, with modulation frequency 100Hz, then the attenuation rates of the Quasi-TEM propagating in the earth-ionosphere waveguide are usually less than IdB/Mm, and the magnetic field strength 1000km away from the heating location is in the order of 10-8A/m.
     数值结果表明,如果高频有效发射功率为100MW量级,频率为5MHz,调制频率为100Hz,则准TEM模式在地球-电离层波导中传播的衰减率一般小于1dB/Mm,距加热地点1000km处海面(地面)上磁场强度的量级为10~(-8)A/m。
短句来源
     Based on the scattering theory of coda waves for local earthquakes suggested by Aki,K and Chouet and using the foreshock and aftershock data for the M S5 8 Zhongdian earthquake on July 17,1993,space-time variation in β and Q C -1 values of coda wave amplitude attenuation rates before and after the earthquake is studied.
     以Aki,K和Chouet[1] 提出的地方震尾波散射理论为基础 ,利用 1993年 7月 17日中甸MS5 8地震的前震和余震资料 ,研究了该次地震前后的尾波振幅衰减率 β和QC-1值的时空变化。
短句来源
     Traces of dyes indicate that the stable length increases with an augment of H, and the relations between spatial attenuation rates of disturbance and wavenumbers are correspondent with theoretical results by the analysis of spatial mode.
     染色线观测显示H值增大使扰动失稳距离增加,扰动衰减率与波数的关系同空间模式稳定性分析的理论结果定性一致。
短句来源
     The results show obvious variation in the β and Q C -1 values of regional coda wave amplitude attenuation rates before and after the main earthquake.
     结果表明 ,主震前后区域尾波振幅衰减率 β和QC-1值发生了明显的变化。 主震前 ,区域平均 β值为 0 0 12 2s-1,相应的QC 值为 111;
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  “attenuation rates”译为未确定词的双语例句
     According to first-order reaction,nitrobenzene's total natural attenuation rates constant are 0.063 5/h and 0.005 9/h respective of silt medium and sand medium.
     根据一级动力学方程计算得出,硝基苯在淤泥介质中的自然衰减总速率常数为0.063 5/h,在砂砾介质中的自然衰减总速率常数为0.0059/h。
短句来源
     The Influences of Axial Conductors on Mode Attenuation Rates a long Leaky Feeder in Rectangular Tunnel
     隧道内纵向导体对漏泄电缆通信中传播衰减率的影响
短句来源
     u(ω) 1/f3,f>fc3 in the fourth region. Since there are different attenuation rates with frequency in the spectra,this case results in different source parameter relations for different magnitude ranges (i.e. different ranges of seismic moment).
     在Ⅵ区,f >f_c3,u(ω)∝1/f~3.由于在四个区域u(ω)随频率的增加下降的速度不一样,决定了震源参数在不同的震级范围内(也就是不同地震矩范围)有不同的表达式.
短句来源
     As compared with the brewing yeast 07, the hybrid strains N3204 and N3216 exhibited increased attenuation rates and possessed the ability to supe-rattenuate the wort in 11.5° P. on 2-L scale fermentation.
     与生产用啤酒酵母亲株07比较,杂交种N3204和N3216在IL啤酒发酵过程中显示酒精产生速率快,发酵度高等较优良的发酵特性。
短句来源
     There were significant statistical differences in the complete necrosis rates of tumors,but there were no significant statistical differences in the attenuation rates of positive AFP and one-year survival rates between the two groups.
     肿瘤完全坏死率分别为6 8.7%,4 0 .0 %(P =0 .0 2 3)。 两组间肿瘤完全坏死率有显著性差异,但两组间AFP值转阴率及1年生存率均无显著性差异。
短句来源
  相似匹配句对
     The rates of increase of R。
     值增加的速率存在差异,前期R。
短句来源
     Attenuation: 2;
     衰减2;
短句来源
     The Dr rates of E.
     coli的耐药性不同 ,尿中E .
短句来源
     The Attenuation of Laser in the Atmosphere
     大气对激光传输的影响
短句来源
     The Influences of Axial Conductors on Mode Attenuation Rates a long Leaky Feeder in Rectangular Tunnel
     隧道内纵向导体对漏泄电缆通信中传播衰减率的影响
短句来源
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  attenuation rates
Attenuation rates of the order of 1 dB/km are possible for operating frequencies of 20 kHz or lower if the crystalline rock in the waveguide has conductivities less than 10-6 mhos per meter.
      
Internal waves are most strongly damped in the layered system (c) whilst the calculated attenuation rates are least for the thermoclinic structure (a).
      
and the recent data ofHeritage et al., attenuation rates at VLF are deduced.
      
Events conducted for three thicknesses of the explosive layers allowed conclusions to be drawn about the changes of rarefaction and attenuation rates.
      
Item attenuation rates were high for both informants, with adults failing to confirm 42% and children 58% of baseline responses at retest.
      
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Chisnell- no's method is applied to studying the propagation of a perpendicular hydromagnetic shock wave in the inhomogeneous magnetic field. A new shock parameter, the characteristic velocity of shock wave representing' the geometric mean of the shock velocities in both sides of the front, has been introduced. The propagation equation thus obtained is greatly simplified. The equation is integrated by numerical method in the case of "strong magnetic medium", where the Alfvén velocity is much greater than the...

Chisnell- no's method is applied to studying the propagation of a perpendicular hydromagnetic shock wave in the inhomogeneous magnetic field. A new shock parameter, the characteristic velocity of shock wave representing' the geometric mean of the shock velocities in both sides of the front, has been introduced. The propagation equation thus obtained is greatly simplified. The equation is integrated by numerical method in the case of "strong magnetic medium", where the Alfvén velocity is much greater than the sound velocity. Three types of particle density distribution are considered: (1) the Alfvén velocity is constant, (2) the density is uniform and (3) the ratio of the density to the field intensity remains constant. It is shown that when a shock wave propagates from a weak field into a strong one, its strength measured by the jump ratio of field intensity always decreases. For medium with a constant Alfvén velocity the shock wave decays most slowly; for a medium of uniform density the shock wave attenuates most quickly; while for the constant density-field ratio medium the attenuation rate appears to be intermediate. In the weak shock limit, the amplitude of wave is inversely proportional to the square root of the Alfvén velocity. These results are discussed in relation to the magnetic shock propagating in the earth's magnetosphere on the assumption that the whole space is filled with wholly ionized hydrogen plasma whose density is proportional to the field intensity, as confirmed by whistler observation from 2 to 5 earth's radii distance. In this case, it is shown that a shock wave of initial velocity 10~8cm/sec at 10 earth's radii distance will excite a 60γ field change in the earth's surface, comparable to the order of magnetitude of the sudden commencement of a strong storm in the lower latitudes.

本文应用Chisnell- no方法,求解了在理想介貭中,垂直磁流体冲激波在非均勻磁場中的传播問題。这种方法,把非均勻介貭分解成无限小的弱間断面,根据气体动力学中波与間断面相互作用的原理,算出激波通过弱間断面时的强度变化,然后用积分求得激波通过整个非均勻区时的强度变化。作者引入了激波的特征速度(它是激波在波前后介貭中传播速度的几何平均值)作为輔助参量,得到形式上比較簡单的激波传播方程。然后考虑了磁压力远大于气体压力的强磁介貭中的激波传播問題,并进行了数值积分。采用的介貭密度模型有三种:(1)阿尔芬波速为常数;(2)密度不变;(3)密度与磁場强度成正比。計算結果表明:当激波由弱磁場向强磁場传播时,激波的强度逐漸变弱。其中,在阿尔芬波速为常数的介貭中,激波强度的衰减最为緩慢;在密度不变的介貭中,激波强度的衰減最为迅速;而在密度与磁場成正比的介貭中,激波强度的衰減則介乎上述两种密度分布之間。作者联系磁流体冲激波在地球外层空間的传播問題进行了討論,密度的模型采取大气啃昔的观測結果(卽上述第三种密度分布),并进行了适当的外推,估計了在十个地球半径处的磁流体冲激波传到地面时的强度,求出了激波在地面引起的磁場变化与激波初始...

本文应用Chisnell- no方法,求解了在理想介貭中,垂直磁流体冲激波在非均勻磁場中的传播問題。这种方法,把非均勻介貭分解成无限小的弱間断面,根据气体动力学中波与間断面相互作用的原理,算出激波通过弱間断面时的强度变化,然后用积分求得激波通过整个非均勻区时的强度变化。作者引入了激波的特征速度(它是激波在波前后介貭中传播速度的几何平均值)作为輔助参量,得到形式上比較簡单的激波传播方程。然后考虑了磁压力远大于气体压力的强磁介貭中的激波传播問題,并进行了数值积分。采用的介貭密度模型有三种:(1)阿尔芬波速为常数;(2)密度不变;(3)密度与磁場强度成正比。計算結果表明:当激波由弱磁場向强磁場传播时,激波的强度逐漸变弱。其中,在阿尔芬波速为常数的介貭中,激波强度的衰减最为緩慢;在密度不变的介貭中,激波强度的衰減最为迅速;而在密度与磁場成正比的介貭中,激波强度的衰減則介乎上述两种密度分布之間。作者联系磁流体冲激波在地球外层空間的传播問題进行了討論,密度的模型采取大气啃昔的观測結果(卽上述第三种密度分布),并进行了适当的外推,估計了在十个地球半径处的磁流体冲激波传到地面时的强度,求出了激波在地面引起的磁場变化与激波初始速度之間的关系。根据上述簡化模型,計算結果表明,在十个地球半径处初始速度为10~8厘米/秒的激波,传到地面引起的磁場变化大約为60伽(亻馬),这个数值的量級恰好与中低緯度强磁暴的急始变幅相符。

Protection of openings is the important part of the blast-resistant structure. Attentions should be paid to the study of the designing of protection devices, such as blast valves and blast doors. According to the restults of tests in shock tube, this paper deals with two points: One is the calculation method of the shock waves attenuation rate of the blast valves; the other is that the additional moments caused by the deformation of the arch-ends of the blast doors should be noticed.

孔口防护措施是抗爆结构的重要组成部份,因此必须重视研究孔口防护设备如防爆活门与防护门的设计。本文根据激浓管试验所得数据,提出了防爆活门消波率的计算方法,以及在设计拱形防护门时应注意拱脚位移所引起的附加弯矩。

This paper represents a progress report of some experimental investigations carried out on the axial-flow low pressure compressor of the B1 engine with inlet flow distortions.During the testing, characteristics, surge lines, Critical sector angles, and attenuation rate to distortion are measured with inlet flow distortion for compressor with blades of different aspect ratios. In the paper, the experimental results are discussed and analysed. It was shown that the response to inlet flow distortion of compressor...

This paper represents a progress report of some experimental investigations carried out on the axial-flow low pressure compressor of the B1 engine with inlet flow distortions.During the testing, characteristics, surge lines, Critical sector angles, and attenuation rate to distortion are measured with inlet flow distortion for compressor with blades of different aspect ratios. In the paper, the experimental results are discussed and analysed. It was shown that the response to inlet flow distortion of compressor with different aspect-ratio blades is different. The compressor with blades of lower aspect ratio has better distortion tolerance and greater surge magin for inlet distortion condition than that with higher aspect ratio. The result is that the operating characteristics of engine is improved and this compressor is more suitable for airplane flight during maneuver.As the airplane flight envelope is expanded, a much better operating characteristics is required. Improvement of distortion tolerance has already become one of the main subjects of research and development. In order to improve the distortion tolerance of Compressor and expand the maneuverable envelope of the engine, the investigation of various Casing treatments is being carried out on the Compressor. This paper only gives a part of the investigation program.

本文为B_1型机低压压气机进口流场畸变试验的阶段小结. 试验中,在不同进口流场畸变度下,录取了两种具有不同展弦比叶片的压气机的等转速特性线和喘振边界,并测定了各自的抗畸变的临界扰流角及对气流畸变的衰减能力.文中对试验结果进行了探讨和分析.由试验结果表明,不同展弦比叶片的压气机对进口流场畸变的响应特性是不相同的.与大展弦比的比较,小展弦比叶片的压气机有较好的抗畸变能力,具有较大的防喘裕度,能提高发动机的泼辣性,更能适应和满足飞机的机动飞行.

 
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