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Here we report the chemoenzymatic synthesis of Ro 25-8210 (1) and Ro 25-6630 (2) by using microbial reduction of a-chloromethyl ketone 4 mediated with baker's yeast and Geotrichum sp. to afford the optically active (R) and (S)-α-chlorohydrin 8 respectively as the key step. 相似文献
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Single event effect in a ferroelectric-gate field-effect transistor under heavy-ion irradiation
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The single event effect in ferroelectric-gate field-effect transistor (FeFET) under heavy ion irradiation is investigated in this paper. The simulation results show that the transient responses are much lower in a FeFET than in a conventional metal-oxide-semiconductor field-effect transistor (MOSFET) when the ion strikes the channel. The main reason is that the polarization-induced charges (the polarization direction here is away from the silicon surface) bring a negative surface po- tential which will affect the distribution of carders and charge collection in different electrodes significantly. The simulation results are expected to explain that the FeFET has a relatively good immunity to single event effect. 相似文献
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Reversible alternation between bipolar and unipolar resistive switching in La-SrTiO_3 thin films
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The alternation from bipolar to unipolar resistive switching is observed in perovskite La0.01Sr0.99TiO3thin films.These two switching modes can be activated separately depending on the compliance current(Icomp)during the electroforming process:with a higher Icomp(5 mA)the unipolar resistance switching behavior is measured,while the bipolar resistance switching behavior is observed with a lower Icomp(1 mA).On the basis of I–V characteristics,the switching mechanisms for the URS and BRS modes are considered as being a change in the Schottky-like barrier height and/or width at the Pt/La-SrTiO3interface and the formation and disruption of conduction filaments,respectively. 相似文献
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SoC是当前微电子芯片发展的趋势,然而由于受带开发环境的PC终端、额外硬件接口、连接线等条件的约束,很难支持SoC产品的二次开发.本文提出一种SoC无线程序加载系统设计方案,通过无线控制实现不同程序的加载,不需要添加额外的接口与复杂的模块,不需要连接下载线和IDE开发环境等工具,简化了芯片的二次开发,增加了芯片的利用率.并且在FPGA板上测试通过. 相似文献
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