64K CMOS随机存储器瞬时辐射损伤模式分析

对64K CMOS随机存储器6264进行了"强光一号"长脉冲辐射状态和短脉冲辐射状态下的辐照实验,测量了存储器翻转效应,分析了不同脉冲宽度下效应的差异,绘制了存储单元的翻转位图,研究了6264的辐射损伤模式。对于6264,其存储单元的翻转主要由内部路轨塌陷引起。     

工程中的振动问题的研究进展

本文试图就工程中的振动问题所涉及的传统工程领域和新兴的工程领域以及与之相关的研究领域和研究趋势进行综述,但由于工程振动问题本身的复杂性以及由于新兴工程领域的不断涌现,这实际上是一个很大的话题,用较小的篇幅恐怕很难总结得准确和到位.     

可伸缩视频编码技术及其在下一代广播电视网中的应用

可伸缩视频编码技术具有分辨率、帧率、质量等方面的可伸缩特性,适用于网络异构、接入带宽多样、终端多样等复杂环境下的视频应用。可伸缩视频编码技术的成熟及其标准化为下一代广播电视网（NGB）环境下高效灵话地开展各种视频业务提供了一种高效的信源编码方案。本文对可伸缩视频编码技术进行介绍,并从技术角度探讨可伸缩视频编码技术在NGB中应用的适宜性。     

Experimental study on the single event effects in pulse width modulators by laser testing

This paper presents single event effect (SEE) characteristics of UC1845AJ pulse width modulators (PWMs) by laser testing. In combination with analysis to map PWM circuitry in the microchip dies, the typical SEE response waveforms for laser pulses located in different circuit blocks of UC1845AJ are obtained and the SEE mechanisms are analyzed. The laser SEE test results show that there are some differences in the SEE mechanisms of different circuit blocks, and phase shifts or changes in the duty cycles of few output pulses are the main SEE behaviors for UC1845AJ. In addition, a new SEE behavior which manifests as changes in the duty cycles of many output pulses is revealed. This means that an SEE hardened design should be considered.     

基于内容自适应的实时视频水印算法研究

设计了一种基于内容自适应的实时视频水印算法。该算法使用Arnold变换对原始水印图像进行置乱,能够基于视频内容自适应地将水印图像嵌入到原始视频的每一帧中,且实现了水印图像的盲提取。实验结果表明,该算法具有实时性、不可感知性,对高斯噪声、Speckle及帧裁剪等常规攻击具有较好的稳健性,可以作为一种防插播、防篡改技术应用于数字广播电视领域中。     

电磁脉冲传感器γ射线干扰阈值实验研究

基于光纤传输的强电磁脉冲传感器具有良好的抗电磁干扰性能.核爆炸以及核爆炸模拟装置激励的电磁脉冲是γ射线与空气分子作用散射的康普顿电子激励的,γ射线能穿透屏蔽壳体进入传感器内部,作用在集成电路上会产生干扰、闭锁或毁伤等效应,影响传感器的性能指标.介绍了在强光I号加速器上开展强电磁脉冲传感器γ辐照效应实验方法.实验结果表明该传感器的γ剂量率干扰阈值为2×106Gy/s.     

SRAM single event upset calculation and test using protons in the secondary beam in the BEPC

The protons in the secondary beam in the Beijing Electron Positron Collider(BEPC) are first analyzed and a large proportion at the energy of 50-100 MeV supply a source gap of high energy protons.In this study, the proton energy spectrum of the secondary beam was obtained and a model for calculating the proton single event upset(SEU) cross section of a static random access memory(SRAM) cell has been presented in the BEPC secondary beam proton radiation environment.The proton SEU cross section for different characteristic dimensions has been calculated.The test of SRAM SEU cross sections has been designed,and a good linear relation between SEUs in SRAM and the fluence was found,which is evidence that an SEU has taken place in the SRAM.The SEU cross sections were measured in SRAM with different dimensions.The test result shows that the SEU cross section per bit will decrease with the decrease of the characteristic dimensions of the device,while the total SEU cross section still increases upon the increase of device capacity.The test data accords with the calculation results,so the high-energy proton SEU test on the proton beam in the BEPC secondary beam could be conducted.     

锁相环单粒子瞬态效应的电路级仿真

对130 nm工艺电荷泵锁相环(PLL,phase-locked loop)开展单粒子瞬态(SET,single event transient)的电路级仿真,根据输出端信号的最大错误脉冲和最大相移寻找SET最敏感节点.结果表明,电荷泵输出级的晶体管对SET最敏感.介绍了一种加固方法,电荷泵PLL加固前后的抗SET性能...     

魔芋葡甘聚糖/壳聚糖复合涂膜对草莓采后贮藏品质的影响

针对草莓贮藏保鲜时间短的问题,选取魔芋葡甘聚糖(KGM)为主要材料,以壳聚糖(CTS)为复配材料,研究KGM/CTS复合膜不同配比(1:2、1:1、3:2、2:1、5:2)对草莓采后贮藏效果及品质(腐败率、失重率、硬度、总酸、可溶性固形物、Vc)的影响。研究结果表明,KGM/CTS复合膜的最佳配比为3:2,其比例能一定程度上降低草莓的腐败率和失重率,同时可以减少草莓内部营养成分的损失,如可溶性固形物、有机酸、Vc等。