放大比

It contributes to the noise figure of the EDFA which causes loss of signal-to-noise ratio.

放大的自发发射可以对引起信噪比损耗的EDFA噪声指数产生影响。

The relations of systemic resolution to subdivision number, grating period, magnifying power and tilt angle are theoretically discussed and experimentally checked on the Abbe comparator.

从理论上分析了系统分辨力与细分数、光栅周期、放大率和倾角等参数的关系，并通过实验在阿贝比长仪上进行了检验。

A new set of appraisal system for the qualities of image enlarge is proposed with farther research based on gray scale,ratio of signal to noise,mean square error and absolute value of gradient.

进一步从灰度偏移、信噪比、均方误差和梯度模值4个方面，提出了一套衡量图像放大质量的评价体系。

In terms of average Symbol-Error Rate at the destination, the performances of multi-relay cooperative transmission with Maximal Ratio Combining detection and opportunistic relaying with multi-node listening were analyzed, one relay retransmitting in Amplify-and-Forward networks under independent Rayleigh slow fading channels. The closed-form expressions of SER for M-PSK and M-QAM modulations are also derived based on Moment Generating Function.

该文从接收端平均误符号率的角度，分析了独立的瑞利衰落信道下，采用放大转发的多中继协同最大比合并检测方案和多节点侦听，单中继转发的机会中继方案的性能；并基于矩生成函数推导出两种方案下M-PSK和M-QAM调制信号平均误符号率的闭合表达式。

All lenses were classified using the lens opacities classification system Ⅲ based on four categories: nuclear color, nuclear opalescence, cortical cataract and posterior subcapsular cataract. ALs were measured 20 times with an IOL Master, 5 times with an IOL Master version 4.0, and 5 and 15 times with an IOL Master version 5.0 and the results were recorded.

IOL Master 5.0版相对于传统IOL Master采用了组合信号分析技术，将多个低信噪比（signal-to-noise ratio，SNR）的单次眼轴测量结果进行叠加组合，使噪音相互抵消，而反映黄斑中央凹位置的信号被放大，从而提高了SNR。

And the optimal output signals can be achieved by adjusting their amplitudes of inputs of the two layers.

该方法可以对弱信号进行逐级地放大，进一步提高了输出信号的信噪比。

In this paper, common preamplifiers were introduced. To obtain the biggest output signal of the noise ration, we choose the low noise tube as the pre-amplifier according to best source resistance match principle.

本文以热释电探测器的前置放大电路为例，主要根据最佳源电阻匹配的原则选择低噪声晶体管，作为前置放大器，以得到最大的输出信噪比。

Not only has the total turnover in April this year, a record since the implementation of the "non-reduction of the size of the new regulation," since a new high, at the same time, the bulk of this month's daily average trading volume is a breakthrough 4401.32 million shares, 1118.7 million shares in October than the daily average Turnover ratio of 2.93 times magnification, reaching record highs.

不仅在4月的总营业额今年创纪录自"执行非对新规规模的缩小，"因为新高，同时，本月的日均交易量的大部分是一项突破性的4401320000股，一十一万一千八百七十点〇〇万股比每天2.93倍的放大倍率的平均营业额比10月份，创出历史新高。

Depending on the character of Lamb wave propagation , thedamage scat tering signals were time reversed and reemit ted to the damage , and then they will arrive at the damage synchronously so that the damage scat tering signal caught again will be amplified. Details about the time reversal amplifying process were analyzed and given. Based on the focalization ability of time reversal theory to the wave origin , the wave propagation was rebuilt by an image method which displays the damage as the focusing point .

根据信号传播自身的特性，研究采用时间反转聚焦方法使损伤散射信号能量叠加放大，从而提高信号的信噪比，分析给出了具体的损伤信号时间反转聚焦增强过程；利用时间反转法对波源的自适应聚焦能力，重建信号传播波动图，通过信号聚焦显示损伤位置和区域。

The effect of flow rates, initial concentrations, resin bed heights, its height/ diameter ratios and temperature on breakthrough curves of sulfuric acid/2-naphthalenesulphonic acid, 2-naphthalenesulphonic acid/sulfurous acid and sulfuric acid/ 2-naphthalenesulphonic acid/sulfurous acid systems was investigated. Excellent agreement was obtained between experimental data and the suggested breakthrough data model, with which the breakthrough curves can be accurately predicted for multi-component adsorptive separation in resin bed, the experiment of adsorptive separation may be scaled up, and the plant may be designed.

考察了流速，初始浓度，床层高度，床层高径比，温度等因素对硫酸-2-萘磺酸，2-萘磺酸-亚硫酸和硫酸-2-萘磺酸-亚硫酸等混合体系穿透曲线的影响，所建立的穿透曲线模型与实验结果拟合较好，模型可较准确预测多组分吸附分离的穿透曲线，可用于指导吸附分离实验的放大以及装置的设计。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。