AMD平台散热技术探讨

AMD处理器一直以高性价比而广受用户欢迎，但同时其高发热量和高耗电量也使许多心仪AMD产品的用户望而却步特别是在炎炎夏日，由于发热量大而造成的系统不稳定、死机等现象会给用户带来非常大的不便，因此，针对AMD平台的散热技术就凸现得尤为重要。     

鸡东县广播电视HFC城网改造设计方案

根据有线电视的数字化、光纤化发展趋势，现在的有线电视网络必须经过改造，以便为今后数字电视的传输和双向传输打下基础，进一步拓展有线电视的功能，为此提供一个城网改造的方案供参考。     

∑-Δ调制噪声整形的研究

介绍∑-△调制器的基本结构,分析∑-△调制技术对噪声进行整形的基本原理及过采样率、∑-△调制器的级数对整形效果的影响,从中获得了一些有用的结论.     

Lower Hearing Threshold by Noise

We demonstrate that noise can be a benefit factor that enables us to hear weaker signals. We measured the hearing thresholds of subjects for pure tone in different noise levels. The results show that pure tone thresholds with noise of some levels are lower than that without noise. The largest down-shift of the threshold by noise among the examined subjects is 5.7 dB, and the smallest is 1.7 dB.     

集成运算放大器同相和反相形式的En—In噪声分析和比较

本文通过分析和比较同相和反相放大器Ｅｎ－Ｉｎ噪声的特点，给出了若干新结果，本文方法在低噪声运放电路设计和运放噪声参数提取中具有十分有重要的意义。     

低温,低频双极晶体管的噪声分析

建立了低温双极晶体管的低频噪声模型，对低温、低频双极晶体管的噪声进行了分析，并给出噪声电压随工作温度、工作电流以及频率的三维变化曲线，指出了双极晶体管获得最小噪声的最佳工作温度和最佳工作电流。     

非线性电路模拟程序中GaAsMESFET器件噪声因子的修正

利用测量得到的［Ｓ］参数和线性噪声参数Ｆｍｉｎ、Ｙｏｐｔ及Ｒｎ来获取器件的非线性本征噪声因子，修正了非线性电路模拟程序中ＧａＡｓＭＥＳＦＥＴ器件噪声因子，并将实验结果与直接优化结果进行了比较。     

High-Density Read-Only Memory Disc with Ag11In12Sb51Te26 Super-Resolution Mask Layer

A novel read-only memory (ROM) disc with an Ag11ln12Sb51Te26 super-resolution mask layer is proposed and investigated for the first time to our knowledge. The carrier-to-noise ratio of more than 40 dB could be obtained from small pits (380nm), which are below the readout resolution limit (400nm), in our dynamic setup with a wavelength of 632.8 nm and numerical aperture of 0.40. Dependences of carrier-to-noise ratio on readout power,readout velocity and film thickness are studied. The results show that the optimum film thickness is 20-50nm and the corresponding carrier-to-noise ratio is more than 40dB at readout power of 4mW and readout velocity of 2m/s in our experiment. The super-resolution readout mechanism for this ROM disc is also discussed.