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A three-quantum-dot spin filter based on nonequilibrium Green?s function technique is proposed with external magnetic flux, Rashba spin orbit interaction, and intradot coulomb interaction taken into consideration. Numerical results indicate a spin filter can be made efficient by adjusting external magnetic flux and Rashba spin orbit interaction. Moreover, the formation of a resonance band is discussed through calculation. It is observed that the possibility of transition from one peak to other three peaks in the conductance spectrum increases with increasing interdot coupling strength. 相似文献
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Linear polarization characteristics for terrain identification at millimeter wave band 总被引:1,自引:1,他引:0
We experimentally research linear polarization characteristics of various terrains at millimeter wave band for image interpretation. We measure and discuss the polarization phenomena, and consider as well the incident angle which also affects terrain radiometric temperature. An economic single-channel radiometer is used in measurements, and changes to the linear polarization are produced by manually rotating its waveguide. We demonstrate that the characteristic in polarization is a decisive advantage of terrain identification in ways beyond that which can be achieved using an intensity radiometer alone. 相似文献
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用于IGCC的燃气轮机技术方案与性能预测 总被引:4,自引:2,他引:2
主要符号表T温度G质量流量。压气机压比。压气机进口导叶安装角N功率X。压损系数X。。氮气回注系数X。;,空分整体化系数下标a空气cg煤气0烧天然气时设计工况。氮气as空分装置f燃料O。氧气1Bu8整体煤气化联合循环(IGCC)燃气轮机与常规的燃机有很大的差异[“l。它改烧中低热值的合成煤气,其燃料量比烧高热值的油气时要增大几倍;不同空分方案和采用不同的NZ回注掺混量时,情况就更为复杂。透平工质流量比压气机空气流量相差很多,燃气轮机总是处于复杂的变工况状态。2IGCC中燃气轮机技术方案归纳IGCC中燃气轮机可行的技术方案… 相似文献
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二次加工柴油中烯烃的分析 总被引:1,自引:0,他引:1
采用溴价电子轰击质谱、核磁共报氢谱以及溴加成/场电离质谱等综合分析二次加工柴油中的燃烃。 相似文献
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采用超高效合相色谱法(UPC2)拆分三唑酮、三唑醇、己唑醇、戊唑醇、联苯三唑醇、腈菌唑等6种三唑类农药对映体,并测定了黄瓜中6种三唑类农药对映体的残留量。样品经乙腈均质提取,石墨化炭黑(GCB)、自制弗罗里硅土柱和QuEChERS试剂依次净化后,Acquity Trefoil AMY1手性色谱柱分离,以超临界二氧化碳-甲醇等助溶剂为流动相进行梯度洗脱,外标法定量。方法定量限(S/N>10)均为0.1 mg/kg,在黄瓜中分别添加0.1、0.2、0.5 mg/kg 3个水平的三唑类农药对映体,其回收率为65.1%~116%,相对标准偏差(n=6)为1.0%~9.6%。该方法实现了对6种三唑类农药16种对映体的拆分及其在黄瓜基质中的残留测定,可为手性农药开发、使用及相关法规的制定提供科学支撑。 相似文献