衰减

The nonlinear oscillation of damped mechanical systems is applied to investigate the electrodynamics of long Josephson junction. The latter has been shown as equivalent to the weakly damped mechanical nonlinear oscillation system.

衰减机械系统的非线性振荡可用来研究长约瑟夫逊结的电动力学方程式，而这方程式等同于弱衰减机械系统的非线性振荡。

During the course of the experiments, by changing the waveshapes of damped oscillation and double exponential impulses in a wide range the relevant corona Q-V characteristics have been measured so as to examine the influence of waveshapes on them systematically.

其次，通过广泛地改变衰减振荡波和双指数雷电波的波形参数来测取相应的电晕伏库特性，系统研究波形参数变化对电晕伏库特性的影响，并就衰减振荡波和双指数雷电波这两种不同波形下电晕伏库特性之间的区别与联系进行了比较。

The transient is seen to be a decaying exponential, and the commonly used measure of the speed of decay is the time constant

由图可见，瞬态响应为指数衰减的，通常用时间常数来衡量其衰减速度。

Recent experiments on the Si (111)(7×7)-(1×1) phase transition showed that when the temperature is raised above the critical temperature, a 7×7 island decays to zero at a constant area decay rate which increases with the size of the initial area.

近期Si(111)(7×7)-(1×1)相变的实验研究发现，将温度升高到相变温度以上时，7×7岛面积以恒定的衰减速率随时间减小至零，且初始面积越大的岛这个衰减速率就越大。

The results show that, in the lower voltage regime, the molecular currents decreased exponentially with the molecular length, and the corresponding decay constant is about 1.41/CH2. Furthermore, the decay constant is demonstrated to be almost independent of the external voltage.

研究结果表明，在低的外加偏压下，烷烃硫醇分子电流值随着分子链长度的增加而指数减小，其衰减常数约为1.41/CH2，且衰减常数基本上与外加偏压值的大小无关。

In particular , when f = 0 , we prove exponential decay of logn towards the constant steady state log n_∞= 0 in the L~1 norm for long times and give the explicit rate of decay.

特别地，当f=0时，边界条件记为： n=1，n_x=0，on aΩ我们证明了当时间t→∞时，log n在L~1空间中关于时间t按指数形式衰减到0，并且给出了显式的衰减速率。

From the junction temperature-varied optical properties measurement, we find that the luminous efficiency will decay more quickly at low current operation. However, when the current density increases to the saturation capacity of the quantum well, the decay ratio will reach a constant.

在变温的光学特性量测上，由实验结果发现，发光效率在较低电流时会衰减的较快，然而在注入电流达到量子井的饱和量后，其发光效率随接面温度升高衰减的现象则会趋近於固定的比例。

A new method to measure fluorescence lifetime, which compose Lssajous figure to a straight line with fluorescence decay curve and RC curve line is described in this paper.

本文介绍了一种测量荧光寿命的新方法：利用荧光衰减曲线和RC电路衰减曲线合成李萨如图形来测量固体荧光材料的荧光寿命。

The optical property of CdS nanocrystals in ZrO 2 thin film has been studied. The film was fabricated by sol gel technique. Photoluminescence and photoluminescence excitation spectra of the samples with different annealing temperature were measured. Photoluminescence decay curve of CdS nanocrystals at different annealing temperatures was studied.

研究了用溶胶凝胶方法制备的CdS超微粒/ZrO2薄膜的发光特性，测量了不同退火温度处理的样品的荧光光谱、荧光激发光谱和荧光衰减曲线的变化，通过荧光衰减曲线研究了140 ps左右的CdS的带间跃迁发射和较慢的表面态发射。

The results show that, when the volume of the secondary room is 1/3 of that of the primary room,the sound energy decay in the primary room is greatly in- fluenced by the secondary room at an aperture size of less than 10% of the wall,that the energy decay curve and the coupling con- stant in the primary room gradually change with the aperture size,and that the effect of the secondary room on the acoustics in the primary room is uniform.

发现在耦合空间体积与主厅体积比为1/3的条件下，当耦合窗面积与隔墙面积比小于10%时，耦合空间对主厅的声能衰减有较大影响；主厅的声能衰减曲线和耦合常数随开口的改变而逐渐发生变化：耦合空间对主厅各点音质的影响比较均匀。华南理工大学物理科学与技术学院；华南理工大学物理科学与技术学院广东广州 510640；广东广州 510640

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。