We numerically and experimentally proposed a dual-stop-band terahertz filter based on standard microelectronic fabrication method. The stop bands locate at 0.32 THz and 1.02 THz with 3 dB bandwidths of 0.26 THz and 0....We numerically and experimentally proposed a dual-stop-band terahertz filter based on standard microelectronic fabrication method. The stop bands locate at 0.32 THz and 1.02 THz with 3 dB bandwidths of 0.26 THz and 0.55 THz, respectively. The resonance characteristics of the proposed device were discussed with the help of surface current maps and field density maps extracted from computer simulation software to better understand the working principle of the proposed device. On top of that, a total of seven devices with different dimensions were fabricated to fully discuss the dimension effects on the resonant frequency shift and bandwidth changes. This fabrication process is applicable for related integrated metamaterial devices and provides essential experiment evidences for effective ways of manipulating the transmission spectrum of the proposed filter.展开更多
文摘观察慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)稳定期患者中医脏腑辨证与营养状态、血气分析的关系。方法:将60例COPD稳定期患者按中医脏腑辨证分为肺气虚型(n=20)、肺脾气虚型(n=16)和肺脾肾气虚型(n=24)。运用胃电图基本电节律、胃动过缓百分率、实际体质量(actual body weight,ABW)与理想体质量(ideal body weight,IBW)的百分比以及血清白蛋白等指标来评估患者的营养状态,同时进行血气分析。结果:肺气虚型、肺脾气虚型和肺脾肾气虚型患者胃电图基本电节律分别为(56.20±13.24)%、(47.38±10.24)%、(41.35±10.01)%,肺脾气虚型和肺脾肾气虚型较肺气虚型明显降低(P<0.05);胃动过缓百分率分别为(45.18±18.13)%、(46.31±15.83)%、(49.90±17.54)%,3组比较差异无统计学意义(P>0.05)。肺气虚型、肺脾气虚型、肺脾肾气虚型ABW/IBW<90%的发生率分别为50%、75%、54.17%,3组比较差异无统计学意义(P>0.05);血清白蛋白<35g/L的发生率分别为20%、37.5%、54.17%,3组比较差异亦无统计学意义(P>0.05)。肺气虚型、肺脾气虚型、肺脾肾气虚型的动脉血氧分压分别为(78.15±16.63)mmHg、(63.56±15.06)mmHg、(63.17±19.05)mmHg,肺脾气虚型和肺脾肾气虚型的氧分压均较肺气虚型明显降低(P<0.05);动脉血二氧化碳分压分别为(42.25±12.46)mmHg、(48.60±17.60)mmHg、(49.97±13.43)mmHg,3组比较差异无统计学意义(P>0.05)。结论:随着病情程度和低氧、二氧化碳潴留的加重,累及脏腑数目亦相应增加,胃肠道功能障碍和营养不良的发生也有一致性的结果。
基金supported by the National Natural Science Foundation of China(Nos.60706031 and 61574015)the National Science Foundation(No.4122058)+3 种基金the Young Elite Teacher Project(No.YETP0536)the Fundamental Research Funds for the Central Universities(Nos.2014JBM009 and W17JB00280)the State Key Laboratory of Rail Traffic Control and Safety(No.RCS2016K009)the “Talents Project” of Beijing Jiaotong University
文摘We numerically and experimentally proposed a dual-stop-band terahertz filter based on standard microelectronic fabrication method. The stop bands locate at 0.32 THz and 1.02 THz with 3 dB bandwidths of 0.26 THz and 0.55 THz, respectively. The resonance characteristics of the proposed device were discussed with the help of surface current maps and field density maps extracted from computer simulation software to better understand the working principle of the proposed device. On top of that, a total of seven devices with different dimensions were fabricated to fully discuss the dimension effects on the resonant frequency shift and bandwidth changes. This fabrication process is applicable for related integrated metamaterial devices and provides essential experiment evidences for effective ways of manipulating the transmission spectrum of the proposed filter.
