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国内充磁机的发展状况及整体充磁机的主要技术问题 总被引：2，自引：0，他引：2
本文在广泛调研的基础上，综述了国内充磁机的发展状况，分析了我国研制开发整体充磁机需要解决的主要技术问题。 相似文献
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利用有限元分析软件ANSYS对分别粘贴1层、2层、3层CFRP的钢筋混凝土梁建立简化模型,计算分析了三种加固梁在不同加载阶段的混凝土梁及CFRP的应力状况,研究结果表明:随着粘贴CFRP层数的增加,混凝土梁的受力状况可得到一定程度上的改善。 相似文献
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采用经过氢氧化钠和甲苯二异氰酸酯-聚醚二元醇(TDI-PPG)表面处理的黄麻纤维织物作为增强体,以191#通用不饱和聚酯树脂(UP)作为基体,通过模压成型的方法制备了黄麻纤维增强UP复合材料。傅立叶变换红外光谱及X射线光电子能谱分析表明,TDI-PPG接枝于黄麻纤维上;通过热分析确定了复合材料的加工温度为160℃,根据生产经验确定成型压力为2 MPa;用短梁弯曲法测试了黄麻纤维接枝前、后UP复合材料的层间剪切强度,后者大于前者;随着黄麻纤维体积分数的增加,接枝黄麻纤维增强UP复合材料的力学性能得到提高,当黄麻纤维体积分数为54.44%时,接枝黄麻纤维增强UP复合材料的拉伸强度、弯曲强度和冲击强度分别为112.31 MPa,109.32 MPa和14.85 k J/m2。 相似文献
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涂镀法是一种电镀方法,其工作原理是,用带正极的镀笔与作为负极用的工件相接触,在两者之间通以流动的金属镀液。当工件按一定的转速转动时(即正、负极间相对运动),根据电流大小和涂镀时间的长短,即可控制所得镀层的厚薄。涂镀法与槽镀法相比,其使用电流比槽镀大几倍到几十倍,并在短得多的时间内就可 相似文献
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Only a small amount of spectral information is collected because the collection solid angle of the optical fiber probe and lens is very limited when collecting spectral information. To overcome this limitation, this study presents a novel method for acquiring plasma spectral information from various spatial directions. A parabolic-shaped plasma spectral collection device (PSCD) is employed to effectively collect more spectral information into the spectrometer, thereby enhancing the overall spectral intensity. The research objects in this study were soil samples containing different concentrations of heavy metals Pb, Cr, and Cd. The results indicate that the PSCD significantly enhances the spectral signal, with an enhancement rate of up to 45%. Moreover, the signal-to-noise ratio also increases by as much as 36%. Simultaneously, when compared to the absence of a device, it is found that there is no significant variation in plasma temperature when the PSCD is utilized. This observation eliminates the impact of the spatial effect caused by the PSCD on the spectral intensity. Consequently, a concentration-spectral intensity relationship curve is established under the PSCD. The results revealed that the linear fitting R 2 for Pb, Cr, and Cd increased by 0.011, 0.001, and 0.054, respectively. Additionally, the limit of detection (LOD) decreased by 0.361 ppm, 0.901 ppm, and 0.602 ppm, respectively. These findings indicate that the spectral enhancement rate elevates with the increase in heavy metal concentration. Hence, the PSCD can effectively enhance the spectral intensity and reduce the detection limit of heavy metals in soil. 相似文献