查询词典 attenuation

Since the attenuation of the free-space channel between ground and satellite is contributed by the aerosphere, its equivalent length is about 5 km and the total attenuation of round-trip is equivalent to 10 km free-space channel in the earth surface aerosphere.

由于地面-卫星之间的自由空间信道的衰减主要集中在地面大气层，其等效厚度约为5km，往返两次的信道衰减等效于地面大气层的10km。

The results show: 1 attenuation of available chlorine of bleaching powder in water follows the eqution ρ=a+be-kt,attenuation ratio constant increases with reduction in initial concentration of available chlorine, high temperature, increase in COD and light and decrease in pH.

关于漂白粉在养殖生产中应用的研究不多，赵增元等[1]报道了漂白粉在改善对虾池水环境方面的一些结果，王勇强[2]就其对细菌性虾病防治的药理进行了研究，刘长发等[3]报道了漂白粉的清塘效果及其对虾池水质的影响。

The results show: 1 attenuation of available chlorine of bleaching powder in water follows the eqution ρ=a+be(superscript -kt), attenuation ratio constant increases with reduction in initial concentration of available chlorine, high temperature, increase in COD and light and decrease in pH.

结果表明：1漂白粉有效氯在水中按ρ=a+be规律衰减，衰减速率常数随初始有效氯浓度的减小、温度的升高和COD的增大而加快，随pH的下降和光照强度的增加而增加。

Attenuation induced by rain is prediceted with the equivalent complex refraction constant. The attenuation predicted is nearly consistent with that calculated by the formula recomended in ITU-R and measured results, which testifies that the method used in that paper is effective.

然后，利用所得公式计算得到的等效复折射指数预测了降雨衰减率，预测值与ITU-R推荐公式计算结果及实测值基本符合，说明文中所使用的方法是有效的。

Researched influence of frequency on characteristic of electromagnetic wave transmission in tunnels, and analyzed characteristic of electromagnetic wave transmission in circular, arches and curved tunnels by method of metal wave guide, and gives approximate formulas of attenuation rate. Main conclusions we obtain are as follows: in circular,rches tunnels, if frequency is higher, attenuation rate is smaller, it is beneficial for EM waves to transmit, in curved tunnel, higher frequency, more attenuation rate ...

研究了频率对井下电磁波传输特性的影响，采用金属波导法分析了圆形、拱形及弯曲隧道中电磁波的传输特性并给出衰减率近似公式，得出主要结论：在圆形和拱形隧道中，频率越高，衰减率越小，越有利于电磁波的传播；在弯曲隧道中，频率越高，衰减率越大，不利于电磁波的传播；通过特性曲线与井下实验数据相比较得出在900MHz左右为井下无线通信系统传输信号最佳频段。

Results revealed that the large side insulation of the stator bar in slot is available for ultrasonic pulse-echo testing; Coupling transducer on the surface of a practical stator bar could minimize the influence on the measurements of velocity, contributing no destructivity of the ultrasonic testing for stator insulation; The simultaneity of same velocity and higher attenuation can be used to detect insulation delamination from conductors; Compared with the wide sides of the bars in slot, the short sides of the bars near the exit from slot and the end bars had a same velocity and a higher attenuation; The velocity might be exactly measured on the shot sides of the bars near the exit from slot and the end bars, while the attenuation might not, which were examined though filed tests; V min decreased greatly and V av decreased slightly with the service time of the bars.

在实验室对线棒多种结构处的主绝缘和不同运行年数(未老化、16、18 和23年)线棒的主绝缘进行了低频超声反射法检测试验，并进行了现场试验，发现(参见 Hao et al， IEEE DEI， to be published)，槽部线棒的宽面绝缘不受换位绝缘的影响，比窄面绝缘更适合超声测量；线棒表面平滑的半导体层减小了耦合剂对超声测量的影响，实现了无损性；波速不变而声衰减减小可以检测线棒出现绝缘与导体脱壳缺陷；出槽口和端部线棒的窄面绝缘与槽部线棒的宽面绝缘相比，声衰减大而波速一致；现场试验验证了波速不受绝缘结构和现场测试条件的影响，而声衰减受以上因素影响很大(参见 Hao et al，中国电机工程学报， Vol.23 No.4)； V min 随运行年数明显减小， V av 随运行年数慢慢越小。

Based on the establishment of the intensity attenuation relation of Jiangxi Province and its adjacent areas by analyzing isoseismic line data, we develop the attenuation relations for horizontal peak ground acceleration and response spectrum of the areas by selecting the west of USA as the reference region and using the transforming method. In comparison with the seismic motion attenuation relation of eastern China, the result better represents the features of historic and modern earthquake damage distribution in the area, and may contribute to seismic safety evaluation, earthquake damage prediction and fast loss assessment.

在利用江西省及邻区的地震烈度等震线资料建立该区地震烈度衰减关系的基础上，以美国西部为参考地区，转换得到了相应的水平向基岩峰值加速度与反应谱衰减关系，并与中国东部地区的地震动参数衰减关系进行了对比，其结果更加符合该区历史和近代地震震害分布的地域性特点，可进一步应用于地震安全性评价、震害预测、损失快速评估等研究。

Based on the establishment of the intensity attenuation relation of Jiangxi Province and its adjacent areas by analyzing isoseismic line data,we develop the attenuation relations for horizontal peak ground acceleration and response spectrum of the areas by selecting the west of USA as the reference region and using the transforming method.In comparison with the seismic motion attenuation relation of eastern China,the result better represents the features of historic and modern earthquake damage distribution

在利用江西省及邻区的地震烈度等震线资料建立该区地震烈度衰减关系的基础上，以美国西部为参考地区，转换得到了相应的水平向基岩峰值加速度与反应谱衰减关系，并与中国东部地区的地震动参数衰减关系进行了对比，其结果更加符合该区历史和近代地震震害分布的地域性特点，可进一步应用于地震安全性评价、震害预测、损失快速评估等研究

The method of the present invention may also include providing a die that creates a low internal pressure drop, cooling the attenuation medium upon exit of the die and/or providing an attenuation medium with a high relative solvent-vapor content in the attenuation region.

本发明的方法也可包括提供一个建立低内部压降的模具，在拉细介质离开所述模具后对其进行冷却和/或提供在拉细区域具有高相对溶剂蒸汽含量的拉细介质。

Attenuation vs repression The trp operon is regulated by both repression(which determines whether transcription will occur or not)and attenuation.Other operons for amino acid biosynthetic pathways may also be regulated by both repression and attenuation or only by attenuation.

弱化作用与阻遏作用的比较 trp操纵子同时受到弱化作用和阻碍作用的调控，其他氨基酸生物合成途径的操纵子也可能受弱化作用和阻碍作用的调控，或者仅有弱化作用调控。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。