衰减

Based on the observation and analysis of social communication network, it is noticed that in social communication network, the transfer of message is optimized.

基于P2P网络的幂律分布和小世界特性，通过对复杂网络幂律特性产生机制的分析并借鉴人际传播中谣言传播机制，提出了一种结合择优连接机制和谣言传播中兴趣衰减机制的信息资源搜索方法。

The stopband error of prototype filter is used to be the objective function for optimization. Instead of the method of least square approximation, this paper introduce the method of best uniformity approximation.

选择低通原型滤波器最大阻带衰减为优化的目标函数，通常的优化目标函数选用最小平方逼近的方法，本文提出了使用最佳一致逼近的方法。

Diffusion coefficients for metol and p-benzenediol were 2.1×10 cm^2/s and 2.7×10^6 cm^2/s, respectively. The electrocatalysis mechanism has been studied. ATR-FTIR was used for the characterization of the ME/Au SAMs. The oxidation currents were linear in the range of 1.0×10^(-7)~1.0×10^(-4)mol/L for metol and 6.0×10^(-6)~6.0×10^(-4)mol/L for p-benzenediol, with the correlation coefficients of 0. 9992 and 0.9996 by differential pulse voltammetry, and detection limit 2.0×10^(-8)mol/L and 1.2×10^(-6) mol/L for metol and p-benzenediol, respectively.

采用水平衰减全反射－傅立叶变换红外光谱技术对ME/Au SAMs进行了表征，示差脉冲伏安法同时测定米吐尔和对苯二酚，不产生干扰，其氧化峰电流与相应物质的浓度分别在1.0×10^(-7)~1.0×10^(-4)mol/L和6.0×10^(-6)~6.0×10^(-4)mol/L范围内呈良好的线性关系，相关系数分别为0.9992和0.9996，检测限分别为2.0×10^(-8)和1.2×10^(-6)mol/L。

In order to overcome the key problems in the experimental study on microwave plasma thruster, of which the whole system operates under vacuum condition, and to remove the unnecessary energy loss, the microwave source of plasma thruster operated under atmosphere and vacuum condition was developed by applying the design technology of the nonlinear power supply, the integration of attenuator and detector, liquid cooling, after overcoming the gas breakdown problems of electro and microwave apparatus.

为解决微波等离子推力器全系统在真空中进行实验，减少不必要的能量损失，利用开关电源、衰减器和检波器一体化设计技术和液体冷却技术，通过解决微波电子器件在真空中的放电问题，研制出可在大气与真空环境中工作的体积小和质量轻的微波等离子推力器微波源，其输出和反射微波功率可根据磁控管的阳极电流和检波器的输出电压进行测量。

The emitter and the receiver of the microwave measuring system add a measuring travel, completely utilize the Doppler effect, enlarge the microwave absorptive attenuating action of the pulverized coal, and consequently increase the measured voltage difference, avoid the problems of the reflection measurement, and can accurately measure the pulverized coal concentration value.

本发明增加了测量沿程，充分利用了多卜勒效应，增大了煤粉对微波的吸收衰减作用，从而增大了测量的电压差值，而且避免了采用反射测量时出现的问题，能准确的测出煤粉浓度值。

Thus it is suggested that the lifetime of minority carrier should be measured by the relationship V(subscript oc that open-circuit voltage decays with time.

因此建议使用开路电压随时间的衰减关系式V(下标 oc测量少子寿命的方法。

By comparison with the results of ideal Henon sequence mixed with noise,the improved Farmer algorithm is able to increase the precision of noise attenuation and reduce the absolute error between itself and ideal Henon sequ.

通过对混有噪声的Henon序列进行仿真实验，仿真结果显示，改进后的Farm er算法能够提高噪声衰减的精度，降低与理想Henon序列的绝对误差

Considering the complex environment of PLCC,this paper first establishes the channel model of low-voltage power line on the basis of the research of its impedance,attenuation,and noise characteristics.

针对低压电力线通信环境复杂的特点，本文在综述信道模型的基础上，根据对其阻抗特性、衰减特性及噪声特性的分析，提出并实现了利用实际网络结构、负载装置和电力线模拟电路，组成信道模拟系统的方法。

First, a series of liquid crystal polymers with different amounts of cholesterol mesogens and ferroelectric property are synthesized in this research. The structures of the compound synthesized are confirmed by IR and 1H-NMR spectroscopy. The thermal properties are characterized by DSC, POM. In this research, the 3-D molecular arrangement of molecular were measured by Polarization Modulation-Attenuated Total Reflection-Flourier Transform Infrared spectroscopy (PM-ATR-FTIR).

中文摘要本研究分成两个部分，第一部分为合成铁电性液晶及胆固醇液晶，以FTIR及 1H-NMR来鉴定化合物的结构，并以POM观察其液晶特有的光学纹路，用DSC来观察矽氧烷类液晶的液晶相的热转移温度并利用偏光-衰减全反射-傅立叶转换红外线光谱仪(Polarization Modulation-Attenuated Total Reflection – Flourier Transform Infrared)来探讨矽氧烷类液晶分子的三度空间排列。

FTIR results show that LiPF_6 decomposes at a certain degree after storage.And the solvent in the electrolyte is oxided to small molecular weight substance.The polarization of electrode,Mn dissolution and Oxygen deficiency in the LiMn_2O_4,decomposition and oxygenation of electrolyte,Li+ consuming during the incrassated and compacted SEI film is the reason of capacity fading during storage.

电极表面极化、正极材料中Mn溶解以及氧缺陷、SEI膜增厚所消耗的活性锂、电解液的分解和氧化是导致储存后锰酸锂电池储存后容量衰减的主要原因。

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％。