3轴加速度传感器将在消费电子产品中普及

如果将手机倾斜放置,屏幕图像就会模拟液体流动的样子一同倾斜。NEC于2006年8月上市的手机N702iS就具有这种独特功能。为了实现该功能,N702iS内置了3轴加速度传感器,以检测机身的倾斜。     

多模光纤的脉冲展宽的实验研究

1、前言光通信线路的传输容量主要取决于光纤维的脉冲响应特性。多模光纤维其本质是模式数量很多,脉冲响应特性决定于纤维的折射率分布,高次模的吸收及模式变换。而按脉冲响应特性来决定使用带宽的评价方法远未明确确定。这是因为光纤维内传输模式的激励相当复杂,尚不能充分把握住入射到纤维中的脉冲波形和模式的激励状态。     

非平衡CO2-Ar等离子流的光学气流评价

In this study,spectroscopic measurements of CO2- Ar arc plasma flow are conducted using a hollow electrode arc heated wind tunnel. In CO2- Ar plasma,radiation of C2 Swan band system is predominant. Other molecular and atomic spectra are not observed except Cu spectra which are produced due to the electrode melting. Background continuum radiation is observed and overlapped with C2 Swan band system. Temperature evaluation of CO2- Ar arc plasma flow is conducted by the area intensity method and temperature distribution is obtained along the stagnation streamline around a disk model. It is found that the vibrational temperature is much higher than the rotational temperature in the free stream region due to the vibrational nonequilibrium process. In the shock layer,the rotational temperature increases by about 1 000 K while the vibrational temperature decreases by about 1 000 K. Energy exchange between translation and vibration modes is activated in the shock layer,resulting in the decrease of the vibrational temperature. However,the vibrational temperature is still higher than the rotational temperature,indicating that the vibrational relaxation process is not completed. In conclusion,the thermochemical state of the CO2- Ar arc plasma flow is in the vibrational nonequilibrium state along the stagnation streamline around the disk model.     

表面波等离子体暴露下铜表面的氧化特性

Surface wave plasma(SWP) is a kind of low temperature plasma which can be utilized for material development.In this research,argon and oxygen were used as a working gas for an SWP experiment and the influence of the plasma irradiation on a copper surface was examined.Particular,relation between the spatial characteristics of SWP and wetting characteristics was examined.As a result,it was found that spatial characteristics of the SWP affected the wetting characteristics and the oxidation characteristics.     

简单自适应控制在水压伺服缸系统中的应用

In this research, the positioning control of water hydraulic servo cylinder system with the simple adaptive control (SAC) is discussed. Conventional model reference adaptive control (MRAC) also achieves good tracking performance for cylinder control, but the controller structure was much complicated and was not easy to be realized in application. Compared with MRAC, SAC has simpler and lower order structure, i.e., has higher feasibility. But only few papers concerning with the application of the control performance of SAC to hydraulics and pneumatics are available, especially for water hydraulics. In this paper, we will examine and evaluate the control performance of the SAC strategy and it is confirmed that SAC gives better tracking performance compared with PI control.     

第4回电视向水平分工模式转移趋势明显

2009年的全球电视市场也深受经济危机的影响.在中国政府电视下乡政策等的支持下,预计全球平板电视年销量可达1.3亿台,同比大幅增长24%,但整个电视市场却因CRT电视的快速萎缩(全球仅销1.9亿台,比上年略降3%),加之销售的平板电视以中小尺寸居多,导致全年销售额锐减15%,计876亿美元.     

100美元智能手机剖析

在《日经电子》对最新的PV150手机进行剖析后,某大型电子厂商的便携设备设计工程师感叹道:“这款手机的元器件大多选择了通用产品,几乎所有的元器件都被集成在1块PCB板上。所有元器