针对密码芯片的电磁模板分析攻击

给出一种简单的电磁信号的获取办法,说明密码芯片的电磁信号能够用一个手工绕制的金属线圈获取,并且其信号幅度和操作数的汉明重量相关.在描述模板攻击原理和步骤的基础上,介绍了针对密码芯片的电磁模板分析攻击,并且针对一个单片机(AT89C52)上实现的DES密码系统进行了电磁模板分析攻击实验,实验成功恢复了DES第16轮使用的48位子密钥.     

汽车电子芯片EMC测试标准研究

在汽车电子产品所采用的电磁兼容测试标准的基础上,以功率驱动芯片为例,提出了汽车电子芯片级电磁兼容测试的必要性,并重点介绍了集成电路电磁发射测试标准IEC61967和集成电路电磁抗扰度测试标准IEC62132。     

可用于片上集成的绝对值电路

系统中绝对值电路含悬浮二极管,阻碍了片上集成.为此,另辟蹊径用运放构成无二极管绝对值电路.PSpice仿真表明,运放OPA365构成的无二极管绝对值电路与理想电路输出电压的幅值误差较小,最大仅为0.7%;在零电平附近的幅值误差<12 mV,相位误差可略.因此,内部结构合理的轨到轨运放构成无二极管绝对值电路,其幅值误差可望<0.7%.其片上集成后,可用于笔者"AC-AC变换" 项目及电气测量.     

基于同轴与光纤结合的2km数据传输的设计

若采用没有信号调节功能的LVDS芯片与设有驱动器预加重功能和接收器均衡功能的LVDS集成电路构成系统传输数据,电缆的长度便可最多到数百米。但这些系统想要进行数十公里长距离的数据传送,便应将LVDS信号经过光模块转成光信号来传输,并将之与LVDS系统一起搭配使用。采用DS92LV1023和DS92LV1224型号的LVDS芯片与驱动芯片CLC006和CLC014相互配合构成LVDS系统,再与光模块构成一个大系统便能够传输数十公里的距离。该系统已投入使用,其性能可靠、稳定、支持。     

激光诱变滇"三角大香糯"的遗传效应研究

2 0 0 1年我们用He -Ne激光辐照加电场、磁场激发对滇“三角大香糯”进行了育种研究〔1〕,并得到了五株有较优变异的稻种 (第 1代M1 )。 2 0 0 2年我们种植了这五株稻种 ,并进行了各生育期的田间试验观测。分析了诱变滇三角香糯育出稻种的遗传性质     

基于ARM芯片的小型嵌入式系统设计与程序开发

本文介绍了嵌入式的基本概念,设计出基于TARM芯片的小型应用系统,以及相应的VTC初始化程序,最后以此来展望嵌入式系统的未来。     

High Performance,Multiplexed Lung Cancer Biomarker Detection on a Plasmonic Gold Chip

Diagnosis of lung cancer is performed using a plasmonic gold (pGOLD) chip through multiplexed near‐infrared (NIR) detection of carcino‐embryonic antigen (CEA), Cyfra21‐1, and neuron‐specific enolase (NSE) in the serum samples of patients. With ≈50‐fold enhancement of NIR fluorescence, multiplexed microarray analysis of CEA, Cyfra21‐1, and NSE in 10 μL of human serum or whole blood samples on pGOLD chip leads to markedly improved limit‐of‐quantification, limit‐of‐detection, reproducibility, and higher diagnostic sensitivity and specificity compared to traditional biochips and Luminex technology currently in use in hospitals.     

Reversible Molecular Rearrangement of Slightly Acid-treated Starches

The reersible association and dissociation of starch chain populations obtained from acid-treated starches (ATSs) was investigated. Potato starch, both nonglutinous and glutinous rice starches and sago starch were suspended in 15% sulfuric acid until 1% hydroysis occured. These ATSs had relative molecular weight ranges of 25,00–29,000 daltons. In water, about half the molecules were reconstituted into large aggregates of a few million daltons. This change in molecular size depended on presence of potassium chloride. It was not observed in debranched samples. The aggregates showed a clear endothermic peak on a DSC curve. Thus, the reversibly rearranging starch chain populations were not linear, but were branched and had some type of ordered structure.     

Construction of Microfluidic Chip Structure for Cell Migration Studies in Bioactive Ceramics

Cell migration is an essential bioactive ceramics property and critical for bone induction, clinical application, and mechanism research. Standardized cell migration detection methods have many limitations, including a lack of dynamic fluid circulation and the inability to simulate cell behavior in vivo. Microfluidic chip technology, which mimics the human microenvironment and provides controlled dynamic fluid cycling, has the potential to solve these questions and generate reliable models of cell migration in vitro. In this study, a microfluidic chip is reconstructed to integrate the bioactive ceramic into the microfluidic chip structure to constitute a ceramic microbridge microfluidic chip system. Migration differences in the chip system are measured. By combining conventional detection methods with new biotechnology to analyze the causes of cell migration differences, it is found that the concentration gradients of ions and proteins adsorbed on the microbridge materials are directly related to the occurrence of cell migration behavior, which is consistent with previous reports and demonstrates the effectiveness of the microfluidic chip model. This model provides in vivo environment simulation and controllability of input and output conditions superior to standardized cell migration detection methods. The microfluidic chip system provides a new approach to studying and evaluating bioactive ceramics.