IR推出为D类应用优化的汽车用DirectFET2功率MOSFET

国际整流器公司（Internationa Rectifier,简称IR）宣布推出汽车用DirectFET2功率MOSFET系列,适合D类音频系统输出级等高频开关应用。     

飞兆半导体最大限度减小多级电源的功耗

<正>为了满足能源之星(ENERGY STAR)规范要求并减少碳排放,功率电子产品的设计团队继续努力提高PC、服务器、工业电源和消费电子产品的系统效率,以求实现100%     

Is the Near-Earth Current Sheet Prior to Reconnection Unstable to Tearing Mode？

The tearing mode instability plays a key role in the triggering process of reconnection. The triggering collisionless tearing mode instability has been theoretically and numerically analyzed by many researchers. However, due to the difficulty in obtaining the observational wave number, it is still unknown whether the tearing mode instability can be excited in an actual plasma sheet prior to reconnection onset. Using the data from four Cluster satellites prior to a magnetospheric reconnection event on 13 September 2002, we utilized the wave telescope technique to obtain the wave number which corresponds to the peak of power spectral density. The wavelength is about 18RE and is consistent with previous theoretic and numerical results. After substituting the wave vector and other necessary parameters of the observed current sheet into the triggering condition of tearing mode instability, we find that the near-Earth current sheet prior to reconnection is unstable to tearing mode.     

Morlet小波在确定局部周期中的应用

本文通过引入改进的Morlet小波变换核函数,得到了等幅值的Morlet小波变换(MMWT)和功率谱(MMPS).理论及实验均表明,MMPS不但能够准确的确定信号的局部周期,而且使相同振幅(强度)的谐波产生了相同大小的MMPS,弥补了MPS的不足.对于MMWT还给出了相应的Morlet小波变换尺度与频率转化公式.     

Altera加速替代ASIC市场关注FPGA架构和软件创新

随着高阶制程节点芯片开发成本的攀升,企业不得不寻找规模更大的半导体产品市场,以获得较好的投资报酬率(ROI)。这对所有企业都有造成影响,Altera     

A Study on Melody Tempo with EEG

In this paper, tempo perception is investi- gated by recording spontaneous electroencephalograph （EEG）. Ten normal male non-musician college students are selected according to questionnaire results after listening absorbedly to four different tempos of an excerpt from a Mozart sonata. EEGs data are recorded when the subjects are listening to the music. The EEG spectral power （SP） is analyzed for alpha band. The varying trend of power spectrum during exposure to music excerpts of different tempos is studied and shows the consistence with the previous tempo-specific hypothesis： a tempo-transformed performance will sound less natural than an original performance does. The results presented in this paper suggest that tempo is an important factor that could influence the alpha rhythm.     

西安卫光科技有限公司

产品名称：WVM系列产品、大功率晶体管 西安卫光科技有限公司（八七七厂）,由原西安卫光电工厂整体改制而来,成立于2007年元月22日。企业性质为国有企业,隶属于陕西电子信息集团,是我国大功率半导体器件重点骨干企业和军用元器件研制、生产定点企业，公司现址位于高新技术产业开发区电子工业园，占地121．8亩，建筑面积8．45万平方米。现有员工939人，其中，各类专业技术人员256人，高级职称30人，     

研诺高压降压控制器实现12V适配器设计灵活性最大化

研诺逻辑科技(AnalogicTech)宣布推出AAT1185,一款单输出、降压控制器,可提供用于低成本12V适配器的高效功率变换。通过采用研诺独