基于磁检测的AGV导引新方法

利用磁阻传感器作为磁导引路径的检测元件,实现了准确的磁路径定位,在此基础上实现了磁导引。详细介绍了磁检测方法、导引原理以及控制方案。当AGV产生一定范围的位置偏差时(水平偏移不大于±5cm,角度偏转不大于±25°),该方法可以准确的检测并计算出位置偏差并进行相应控制。实验结果表明,该磁导引方式定位准确且易于实现。

霍尔磁敏传感器的原理及应用

介绍霍尔磁敏元件的工作原理,及其在测量与控制领域中的应用,给出了实验线路。

Electromagnetic Fields and Calcium Signaling by the Voltage Dependent Anion Channel

Electromagnetic fields (EMFs) can interact with biological tissues exerting positive as well as negative effects on cell viability, but the underlying sensing and signaling mechanisms are largely unknown. So far in excitable cells EMF exposure was postulated to cause Ca2+ influx through voltage-dependent Ca channels (VDCC) leading to cell activation and an antioxidant response. Upon further activation oxidative stress causing DNA damage or cell death may follow. Here we report collected evidence from literature that voltage dependent anion channels (VDAC) located not only in the outer microsomal membrane but also in the cytoplasmic membrane convert to Ca2+ conducting channels of varying capacities upon subtle changes of the applied EMF even in non-excitable cells like erythrocytes. Thus, VDAC can be targeted by external EMF in both types of membranes to release Ca2+ into the cytosol. The role of frequency, pulse modulation or polarization remains to be investigated in suitable cellular models. VDACs are associated with several other proteins, among which the 18 kDa translocator (TSPO) is of specific interest since it was characterized as the central benzodiazepine receptor in neurons. Exhibiting structural similarities with magnetoreceptors we propose that TSPO could sense the magnetic component of the EMF and thus together with VDAC could trigger physiological as well as pathological cellular responses. Pulsed EMFs in the frequency range of the brain-wave communication network may explain psychic disturbances of electromagnetic hypersensitive persons. An important support is provided from human psychology that states deficits like insomnia, anxiety or depression can be treated with diazepines that indicates apparent connections between the TSPO/VDAC complex and organismic responses to EMF.

某型Hall磁敏元件的可靠性分析

某型磁敏元件寿命试验样本量很大，很难应用可靠性试验用表与Weibull分布基于最佳线性不变估计（BLIE），最佳线性无偏估计（BLUE）枢轴量的数表，本文基于Bayes方法、Blom近似等，对产品进行了拟合优度检验、分布鉴别与可靠性评定。