衰减

The decay process of fluorescence intensity was detected and the curve was fitted by an exponential function.

在荧光光谱峰值波长处分别监测其荧光强度随时间的衰变过程，将获得的荧光衰减动力学曲线采用指数拟合并进行解卷积处理获得不同荧光光子的寿命值。

Besides,this subject introduce the part of LNA .the filter with low frequenc.the part of fixt decline and so on.

本课题还介绍了在射频前端中级联电路之前的LNA单元和固定衰减切换单元以及低通滤波器！

Based on the well-know Pennes'' bioheat equation,we calculated theoretically temperature field of HIFU-induced BFR in tissue,and measured spatial temperature rise in BFR induced by HIFU in freshly excised cow liver at constant acoustic intensity and exposure time, and studied the effects of the physical parameters of focused ultrasound transducer such as frequency,outer radius and curvature radius,focal depth, and acoustic intensity and exposure time on the temperature field of HIFU-induced BFR.

采用生物热传导方程理论计算了HIFU生物学焦域温度场，采用微型热电偶探针测量了HIFU辐照离体牛肝时靶组织温度分布；研究了聚焦超声换能器的物理参数、辐照深度和治疗剂量对HIFU生物学焦域温度场的影响；研究了HIFU在牛肝组织中的传播衰减。

However,for free decay method,its range of changing frequency is very narrow and the initial states of samples are not easily repeated because of the effect of crystallization;for forced oscillation method,the measuring results are seriously affected by crystallization,which is caused by slow heating rates.

然而，自由衰减法有限的变频范围，以及由于受晶化的影响，使两次升温测量时样品的初始状态不易重复；用强迫振动法测量时，同步变频条件限制了升温速率，造成金属玻璃的晶化过程严重影响了测量结果。

In this paper, the grain boundary internal friction peak in polycrystalline aluminium was measured both as a function of frequency and as a function of temperature by forced vibration method.

近五十年来，晶界弛豫的温度内耗峰主要是用自由衰减方法进行研究的，这种研究是建立在下面的假设上：即。。。

In this paper, the forced vibration method was employed to measure the internal friction of bamboo crystalline and bi-crystalline aluminium.

近五十年来，晶界弛豫的温度内耗峰主要是用自由衰减方法进行研究的，这种研究是建立在下面的假设上：即晶界弛豫是一个速率过程，满足Arrhenius关系。

In the integral formula of Fourier transforms of option pricing formula,by using residues theorem two integrations were simplified into a single numerical integration which has a faster rate of decay.

在期权定价公式的傅立叶变换积分公式中，运用留数定理将公式中的两个积分式子化简成一个被积函数衰减较快的积分函数式，从理论上提高了计算效率，缩短了计算时间，为投资者快速计算期权价值节约了时间。

Further analysis shows, the average fractional error between the related equation and the actual experimental date is 1.5% in 20℃. The related equation based on dimensional analysis can properly coincide with the actual result.

通过分析比较发现，20℃时关联式相对於实测数据的平均相对误差仅为1.5%，由此证明利用量纲分析得出的膜通量衰减关联式较好地反映了实验结果。

The results show that the stock market returns and volatilities in China have long memory and persistence although they are not as strong as that of American stock market; The memory of Shanghai stock is stronger than that of Shenzhen stock; The autocorrelation function of a fractional integration model can fit the sample autocorrelation much well.

结果表明：中国股市收益率与波动性具有长记忆性，尽管收益率的长记忆性不如美国股市强；上海股市的记忆性明显强于深圳股市；分数可积模型较指数衰减自相关函数能更好地拟合样本的自相关系数

It solves the problem that how to calculate diffusion coefficient D when the fluorescence have significant linear attenuation which is often observed in FRAP experi- ments.

本文提出了一种切实可行的计算膜脂流动性的方法，给出了详细的实施步骤、计算方法及结果，并解决了在荧光存在明显线性衰减这一常见情况下的扩散系数D 的计算问题。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。