查询词典 attenuation factor

The first part of this paper is to set up a novel mathematical model describing expression and regulation of trp operon, in which not only the effects of repression and attenuation on transcription are taken into consideration, but the interaction between repression gene and structural gene as well as the transportation of tryptophan across cell membrane are also considered.

论文第一部分主要在已有的色氨酸操纵子模型基础上，建立了一个新的用于描述色氨酸操纵子动态行为的数学模型，它不仅考虑了阻遏、弱化以及反馈抑制作用对转录的影响，而且考虑了表达阻遏蛋白的基因和表达关键酶的基因之间的相互作用和影响，以及色氨酸外排的影响。

The attenuation of the leachate pollutants in the subsurface environment is closely related to the microbial activity.

渗滤液中污染物在地下环境中的衰减与微生物的活动息息相关。

Fig. 3 The condition of signal attenuation of sulfa

图3 连续进样后磺胺类药物的信号衰减情况

This software is programmed using VB for the analysis of industrial superheated steam in the pipeline transmission of useful energy attenuation.

本软件采用VB编程，用于分析工业上过热蒸汽在管道传输过程中的有用能衰减。

Two of the most predominant characteristics of Surface Wave are Dispersion and Attenuation which ar...

频散和衰减是面波传播中的两个基本特征，利用面波频散和衰减可以有效地研究地球内部速度结构和粘弹性结构。

Measure character: Frequency limits: CH1:dResolution of C ～ 225MHz frequency: 10 / second time-interval resolution : N/A measures speed: Can amount to 200 times measure / the second mixes in limits of the voltage on GPIB sensitivity : DC ～ 100MHz: 200MHz of ～ of 5Vac+dc 100MHz of 20mVrms ～±: 225MHz of ～ of 5Vac+dc 200MHz of 30mVrms ～±: Input of 5Vac+dc of 40mVrms ～± adjusts:(CH1 chooses) impedance, coupling: 1M Ω or 50 Ω, ac or Dc are low connect filter: 100kHz, but switch attenuation:× 1 or reference of × 10 exterior time base inputs: 1, 5, 10MHz sparks: CH1, to rising / drop the edge sparks, the percentage that uses signal n or absolutely voltage install n, setting sensitivity mixes to low, medium or tall gate start: Automatic, the hand is moved (setting gate time or resolution digit); Exterior, defer interface: Standard GP-IB(IEEE 488.1 and 488.2), take; of SCPI compatible language to say RS-232 power source only: 10 ％ of 100-120VAC ±, 50, 60 or 10 ％ of 400Hz ± 10 ％ of 220-240VAC ±, 50 or 10 ％ of 60Hz ± are suttle: 3kg dimension: 348.3mm of × of 212.6 × 88.5H

测量特征：频率规模：CH1：dc～225MHz 频率分辨率：10位/秒时候距离分辨率：N/A 测量速度：可达200次测量/秒在GPIB上电压规模和灵敏度： DC～100MHz： 20mVrms～±5Vac+dc 100MHz～200MHz：30mVrms～±5Vac+dc 200MHz～225MHz：40mVrms～±5Vac+dc 输入调节：(CH1选择)阻抗，耦合： 1MΩ或50Ω，ac或dc 低通滤波器： 100kHz，可切换衰减：×1或×10 外部时基参考输入： 1，5，10MHz 触发： CH1，对回升/回升沿触发，用信号电平的百分数或相对电压设置电平，设置灵敏度至低、中或高闸门和启动：主动，手动(设置闸门时候或分辨率位数)；外部，延迟接口：尺度GP-IB(IEEE 488.1和488.2)，带SCPI兼容说话；只讲RS-232 电源：100-120VAC±10％，50，60或400Hz±10％ 220-240VAC±10％，50或60Hz±10％净重：3kg 尺寸：212.6×88.5×348.3mm

This thesis will be expanded from two aspects: first, delta-sequence obtained by cubic spline interpolation cardinal function showed the properties of symmetry, Riesz basis and interpolation. Non linear convection diffusion equation (Burgers′equation) was used as an example. Then we modified this delta-sequence to improve the attenuation, the same example was used in numerical application.

在小波方法与PDE算法相结合方面，本文主要从两方面入手：首先是以样条插值基函数为基础构造δ-序列核，以非线性对流扩散方程为例给出了一种数值算法；进而对三次样条插值基函数进行改进，构造新的具有更快衰减性质的δ-序列核，同样以非线性对流扩散方程为例验证了新函数在数值求解中的有效性。

In this paper,the principle and primary results of measure ultrasonic sound velocity and attenuation coefficient by ultrasonic syntonic method are introduced.

1 前言各种介质的声学特性主要由声速、声衰减、声阻抗等参数来描述，这些量统称为介质的声学特征量。

The effects of several parameters of a digital ultrasonic borehole televiewer on system performance are analyzed, for example, those of the distance measuring error, the crack distinguishability, the side beam of the ultrasonic transducer and the wave propagation attenuation, The distance measuring error depends mainly on the accuracy of time measurement.

本文分析了数字井下超声电视系统中影响系统性能的几个主要参数，其中包括距离测量误差、系统的裂缝分辨力、超声换能器的副瓣影响以及声波的传播损耗等。

The goal is to increase the integration and to minimize the component count, cost and interconnection attenuation.

主要的目的为提高整合度并减少天线组成元件的数目，成本，以及连接介面的衰减。

Pradeep Indulkar, a senior official at the Maharashtra state Home Ministry say 101 human were killed and 287 injured.

马哈拉施特拉邦内政部高级官员Pradeep Indulkar称，有101人在冲突中丧生，287人受伤。

Mark Frei, a senior vice president of West, says 80% of West's homeagents have some college education, compared with 30% of those whowork in office-based call centers.

Frei说，该公司80%在家办公的人员都拥有本科学位，而在公司电话中心工作的人中只有30%拥有本科学位。