衰减比

AOB实验组在形成基质矿化时的衰减比对照组和空白组少（P<0·05）。

Attenuation of AOB in the experimental group was less than the control group ( P < 0.05 ) .

计算结果表明，在弹性介质内正弦输入脉冲的衰减比Heaviside输入脉冲的衰减快，正弦输入脉冲的作用时间越长，衰减越严重。

Calculations show that the attenuation of sine input pulse is higher than Heaviside input pules in the elastic medium . The longer the action time of sine input pules , the higher the attenuation .

激光传输在海拔较高的大气分层中受到的衰减比海拔低的层段小；

The higher the elevation of atmospheric layer , the less the optical propagational attenuation in the air .

塌陷地震S波最大振幅随距离的衰减比构造地震快。

The attenuation of the maximum amplitude of s wave of collapse earthquakes with time is faster than that of tectonic earthquakes .

音频高通滤波器，通过音频源的高频率和衰减比截止频率低的信号。

The Audio High Pass Filter passes high frequencies of an AudioSource and cuts off signals with frequencies lower than the Cutoff Frequency .

水中冲击波压力峰值在炮孔轴线上衰减比垂直于炮孔轴线向上衰减慢。

The peak pressure attenuation of shock in water in borehole axis direction was slower than the direction vertical to the borehole axis .

紫外光照移除后，栅极偏压的作用使得开态电流衰减比关态电流慢许多。

After the UV light is turned off , the rate of on-state current decay more slowly than off-state current due to the effect of gate bias voltage . 2 .

通过统计与频域分析发现：爆破地震波在爆源近区的衰减比中、远区要大得多；

Based on the analyses of both statistics and frequency , it is found that the attenuation of seismic waves in the near region away from the explosion source is more abrupt than that in the middle and far regions ;

一般情况下，正常密度与高密度在固井质量良好的条件下，其CBL衰减率比低密度都要高，其套管波首波幅度值都应该比低密度小；

Generally , under conditions of good cement job quality the CBL decay rate of normal density and high density admixture cement is higher than that of low density admixture cement and the head wave amplitude of casing wave is lower .

以落叶植物为优势种的群落在生长期对噪声的衰减值比落叶期高4~5dB。

The value of noise attenuation of plant community was 4-5 dB bigger in growing period than in defoliating period .

激发极化衰减谱比极化率具有更为丰富的储层信息，与地层的孔隙结构、渗透率、地层水电阻率以及泥质含量密切相关。

The induced polarization decay curve contains more information than the polarizability which was used in the conventional induced polarization logging tool .

并对该地区植物固沙的灌溉制度进行了初步的研究，结果表明，虽然沙土水分蒸发移动性与一般规律相同，但蒸发强度及其衰减速度比质地较重的土壤大。

The results showed that evaporation intensity and declining rate of soil moisture were greater in sand land than in clay soil land .

在此基础上研究了涡流检测中电各向异性材料中的趋肤效应，研究发现碳纤维复合材料中的涡流衰减速度比电各向同性材料中的更快。

The skin effect in electrically anisotropic materials has also been studied . Simulation results show that eddy current in CFRP decays faster than that in isotropic materials .

利用这种方法获得的弹片初速及衰减系数比目前应用的区截法测得的结果更科学、更准确，而且避免出现增速弹片和恒速弹片的反常现象。

The result obtained by this method is more accurate and scientific than the present area cutting theory , and meantime it can avoid the abnormal phenomena of the acceleration speed fragment and constant speed fragment .

其中西部是来自太平洋的水体平流与扩散的海域，衰减深度比东部要小，体现了夏季太平洋水体中浮游植物的影响。

The maximum euphotic depth occurs in deep water , which the west caused by Pacific waters of advection and diffusion is smaller than the eastern part because of the impacts of the phytoplankton of the Pacific waters .

结果表明，云雾的衰减一般比气溶胶的大，随着能见度的降低增加较快，即云雾对激光系统的应用有很大的限制作用。

It shows that the attenuation of clouds and fog are generally larger than the aerosol and increase quickly with the decrease of visibility . That is clouds and fog has great limits to the application of laser system .

母猪和仔猪的抗体均随着哺乳期的推移逐渐下降，并且仔猪母源抗体衰减速度比母猪抗体衰减速度快。

The levels of antibodies between piglets and sows showed direct correlation . Antibodies of both were dropped along with the duration of lactation period and the dropping speed of maternal antibodies in piglets was much faster than that in sows .

结果表明：随频率的增加，慢纵波的衰减系数比快纵波的衰减系数增加的快，而在同一频率下，慢纵波的衰减系数大于快纵波的衰减系数；

The results showed that as increasing with frequency , the attenuation of slow longitudinal wave increasing faster than that of fast wave . At a certain frequency , the attenuation of slow wave larger than that of fast wave in cancellous bone .

在3种种植密度下，60cm行距种植的大豆群体，鼓粒期叶片衰减速率均比30cm行距的小。

Under 3 different seeding rates , as soybeans Planted in 60 cm row space , the leaf area decrease rates at the grain filling stage were slower than those of planted in 30 cm .

通过分析实验取得的云纹图得到了裂尖区域的位移场、应变场，发现裂尖区域应变随着与裂尖距离的增加衰减的速率比没有电场作用下的理论计算结果要快。

By analyzing the moire interferometry pictures we find that strain decreases faster than predicted by theory as the distance increases away from crack tip .

黄光峰强度随温度升高的衰减速度要比带边峰慢得多。

The attenuation degree of the edge peaks intensity after annealing reduces with the temperature increasing at a higher decay rate than that of the yellow peak .

结果表明：由于尘埃充电过程，尘埃等离子体电导率、介电常数以及衰减系数都比一般等离子体的大。

Due to the charge process of dusty particles , the electric conductivity , dielectric coefficient and modulus decay of dusty plasma are larger than that of plasma .

氯胺的衰减速率常数比游离氯小一个数量级，说明衰减速度远远小于游离氯。

The decay rate constant of chloramines was an order of magnitude smaller than that of free chlorine , which indicated chloramines decayed far more slowly than free chlorine did .

坝壳料动力参数（包括最大动剪模量、模量比随动应变衰减以及阻尼比随动应变增长的规律）的确定以及抗液化强度的确定是实现液化评估的关键。

How to determine dynamic parameters of dam materials ( including maximum dynamic shear modulus , the attenuation regularity of modulus ratio with dynamic strain and the growth regularity of damping ratio with dynamic strain ) and liquefaction resistance are keys to realize liquefaction evaluation .

对于单自由度振动系统，推导出响应历程与时轴所围各面积之间的确定性关系后，利用各面积之间的关系来确定自由衰减振动的阻尼比系数。

For a single-degree-of-freedom system , the relation between response and time is determined .

用多分量衰减系数或衰减比剖面，能够识别砂岩含气/水产生所产生的高频衰减异常。

The section of attenuation or attenuation ratio for multi-component data can distinguish from gas / liquid .

计算表明，随航高和扫描角度的增加，回波信号功率衰减，信噪比降低，测距误差增大。

The results indicate : with the increasing the flying height and scanning angle , the received backscattered power decreases rapidly , the SNR deteriorates seriously and the ranging error increases significantly .

扁平驻极体微电机的工作原理是电容可变原理，电机转子采用驻极体材料制成，转子表面电荷的衰减时间常数要比驻极体本身形成的周期长得多。

The operating principle of the compressed electret micromotor is the variable capacitance . The attenuation time constant of the charges on rotor surface is much longer than the shaping time of electret itself while the rotor is made of electret .

在高频通道的设计上，为了保证安全可靠，采用2个相地结合设备的相间耦合方式，经测试，衰减和信噪比等各项技术指标满足通信和保护的要求。

In order to ensure safety and reliability the design of HF channels has adopted the phase-to-phase coupling mode for 2 phase and ground combined devices . After measurement their attenuation and signal-to noise ratio and other technical indexes have met the requirements for protection and communication .

在冲击波作用区，环氧丙烷燃料的FAE爆炸超压约是TNT爆炸效果的5倍，超压均呈衰减趋势，但FAE衰减比TNT缓慢许多。

In the shock wave zone , the explosion power of PO reaches about 5 times of TNT 's. Although both overpressures inclined to decay , overpressure from FAE decayed more slowly than that from TNT .