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A novel quartz crystal microbalance (QCM) sensor with a high selectivity and sensitivity has been developed for the determination of Cu(II) ions, based on the modification of Cu(II) ion-imprinted polymer (Cu(II)-IIP) film onto a quartz crystal. The performance of the developed MIP-QCM sensor was evaluated and the results indicated that a sensitive MIP-QCM sensor could be fabricated. The obtained MIP-QCM sensor presents high-selectivity monitoring of Cu(II) ions, better reproducibility, shorter response time (6 min), wider linear range (0.001–50 μM) and lower detection limit (8 × 10−4 μM). The practical analysis of the MIP-QCM sensor confirms the feasibility of Cu(II) determination in wastewater. 相似文献
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基于Linux平台电动客车车载信息显示系统研究 总被引:1,自引:0,他引:1
为实现未来汽车仪表的数字化,依据汽车行驶显示信息的需要,针对电动客车,终端采用X86主板和嵌入式操作系统,使用Linux下集成开发工具Qt,开发一套基于嵌入式Linux平台的车载信息显示系统,实时显示当前电动客车的电池电量、电池温度、车速和电机工作状态等信息。 相似文献
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Pb(II) is a highly toxic substance, exposure to which can cause various diseases. To better understand the application of TiO2 as a photocatalyst for removing Pb(II) from wastewater, quartz crystal microbalance (QCM) technique was employed to in situ investigate the reduction behavior of Pb(II) on nanocrystalline TiO2 coatings under N2. The processes of Pb(II) reduction at various concentrations of HCOOH and in the presence of different organic additives were monitored, and the corresponding kinetics was proposed. The obtained results showed that the kinetics of Pb(II) reduction on TiO2 coatings was closely related to the organic additives. The HCOOH showed a higher efficiency for Pb(II) reduction in comparison with other organic additives, and the reduction-rate constant reached 0.54 × 10−3 s−1 which was two times higher than that exhibited in the presence of C2H5OH. QCM measurement provides an useful method for monitoring the reduction process of Pb(II) on TiO2 coatings. 相似文献
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介绍了磁悬浮电主轴单元的工作原理,以5.5kW电主轴单元为例,利用ANSYS软件对其径向磁轴承磁场进行了有限元分析.找出其系统磁场分布的变化规律和影响因素.分析表明:在主轴正常悬浮且单边气隙值取0.3±0.004mm,主轴支承处轴颈圆度取0.003mm,径向磁轴承磁极内圈圆度取0.007mm时,磁路磁漏不影响控制系统的性能,主轴实际中心线距理想位置的最大偏移量为0.0025mm,可满足精密机床主轴径向旋转精度性能要求.研究结果为磁悬浮电主轴单元的径向支承结构的优化设计提供了理论依据. 相似文献
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介绍了基于USB-HID(Human Interface Device)接口的高速数据采集系统的开发过程,详细阐述了系统硬件设计、软件设计及其应用。通过EZ-USB FX2芯片CY7C68013和DSP处理器TMS320F2812实现与外部设备之间的数据传输和采集。该系统具有传输速度快、结构简单、实时性和可靠性高等优点,可自动被识别为HID设备。该系统可应用于高速数据和红外图像的传输和采集,传输平均速度可达40 MB/s,响应速度可达10 ms,能较好地满足数据实时传输要求。 相似文献
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分析了计数器齿轮的冷模锻工艺,设计了冷模锻件图,计算及选用了毛坯尺寸及形状,验算了许可变形程度,选择了变形用的设备,拟制了冷模锻前的毛坯处理及设计了冷模锻模具结构。 相似文献
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研究了超声回波信号中二次谐波包络信号的Nakagami分布参数与非线性系数之间的对应关系,以获得更准确的组织非线性定量特征.将超声回波射频信号的基/谐波成分进行分离,获取基波和二次谐波成分的包络信号,分别计算并比较信号的Nakagami分布参数.仿真结果表明,对于不同的非线性系数,二次谐波包络信号的分布参数相互分离,特别是非线性系数β在3~6的范围内具有显著的差异,而对应的基波的差异性不显著.离体组织实验中,与脂肪相比,肝和脑的基波的平均功率ω和形状因子μ的相对差异分别为7.3%和0.03%及2.0%和4.3%;谐波的ω和μ的相对差异分别为8.3%和19.4%及7.0%和34.0%.结果进一步验证了仿真结果的有效性和正确性.综上所述,不同非线性组织超声回波信号中,二次谐波包络信号的Nakagami分布参数具有显著差异,可据此定量分析生物组织的非线性特征. 相似文献