Separated transmit and receive antennas are employed to improve transmit-receive isolation in conventional short-range radars, which greatly increases the antenna size and misaligns of the transmit/receive radiation p...Separated transmit and receive antennas are employed to improve transmit-receive isolation in conventional short-range radars, which greatly increases the antenna size and misaligns of the transmit/receive radiation patterns. In this paper,a dual circularly polarized(CP) monostatic simultaneous transmit and receive(MSTAR) antenna with enhanced isolation is proposed to alleviate the problem. The proposed antenna consists of one sequentially rotating array(SRA), two beamforming networks(BFN), and a combined decoupling structure. The SRA is shared by the transmit and receive to reduce the size of the antenna and to obtain a consistent transmit and receive pattern.The BFN achieve right-hand CP for transmit and left-hand CP for receive. By exploring the combined decoupling structure of uniplanar compact electromagnetic band gap(UC-EBG) and ringshaped defected ground structure(RS-DGS), good transmitreceive isolation is achieved. The proposed antenna prototype is fabricated and experimentally characterized. The simulated and measured results show good agreement. The demonstrate transmit/receive isolation is height than 33 dB, voltage standing wave ratio is lower than 2, axial ratio is lower than 3 dB, and consistent radiation for both transmit and receive is within4.25-4.35 GHz.展开更多
目的:从SRA信号通路研究黄芩苷对乙酰低密度脂蛋白(Ac-LDL)+脂多糖(LPS)诱导的与动脉粥样硬化(AS)相关的巨噬细胞凋亡的影响。方法:收集鼠腹腔巨噬细胞进行体外培养,使用100μg/m L Ac-LDL及1μg/m L LPS诱导巨噬细胞凋亡,以120、240、...目的:从SRA信号通路研究黄芩苷对乙酰低密度脂蛋白(Ac-LDL)+脂多糖(LPS)诱导的与动脉粥样硬化(AS)相关的巨噬细胞凋亡的影响。方法:收集鼠腹腔巨噬细胞进行体外培养,使用100μg/m L Ac-LDL及1μg/m L LPS诱导巨噬细胞凋亡,以120、240、480μg/m L黄芩苷作为低、中、高3种剂量进行干预,Annexin VFITC和PI双染后用流式细胞仪检测细胞凋亡,Western Blot技术检测SRA蛋白表达量。结果:与正常组比较,对照组与模型组的细胞凋亡率差异有统计学意义(P<0.01);低剂量观察组与模型组细胞凋亡率差异无统计学意义;中、高剂量观察组与模型组相比细胞凋亡率差异有统计学意义(P<0.01)。LPS对照组较Ac-LDL对照组的SRA含量显著增高(P<0.05),与黄芩苷低、中、高剂量组相比SRA表达量无统计学差异。结论:SRA信号通路参与了LPS和Ac-LDL双重因素诱导的巨噬细胞凋亡,并且SRA通路蛋白的激活主要与LPS干预相关。展开更多
基金supported by Guangdong Natural Science Foundation(2019A1515011622)Guangdong Provincial Laboratory of Southern Marine Science and Engineering (Zhuhai)(SML2021SP407)。
文摘Separated transmit and receive antennas are employed to improve transmit-receive isolation in conventional short-range radars, which greatly increases the antenna size and misaligns of the transmit/receive radiation patterns. In this paper,a dual circularly polarized(CP) monostatic simultaneous transmit and receive(MSTAR) antenna with enhanced isolation is proposed to alleviate the problem. The proposed antenna consists of one sequentially rotating array(SRA), two beamforming networks(BFN), and a combined decoupling structure. The SRA is shared by the transmit and receive to reduce the size of the antenna and to obtain a consistent transmit and receive pattern.The BFN achieve right-hand CP for transmit and left-hand CP for receive. By exploring the combined decoupling structure of uniplanar compact electromagnetic band gap(UC-EBG) and ringshaped defected ground structure(RS-DGS), good transmitreceive isolation is achieved. The proposed antenna prototype is fabricated and experimentally characterized. The simulated and measured results show good agreement. The demonstrate transmit/receive isolation is height than 33 dB, voltage standing wave ratio is lower than 2, axial ratio is lower than 3 dB, and consistent radiation for both transmit and receive is within4.25-4.35 GHz.
文摘目的:从SRA信号通路研究黄芩苷对乙酰低密度脂蛋白(Ac-LDL)+脂多糖(LPS)诱导的与动脉粥样硬化(AS)相关的巨噬细胞凋亡的影响。方法:收集鼠腹腔巨噬细胞进行体外培养,使用100μg/m L Ac-LDL及1μg/m L LPS诱导巨噬细胞凋亡,以120、240、480μg/m L黄芩苷作为低、中、高3种剂量进行干预,Annexin VFITC和PI双染后用流式细胞仪检测细胞凋亡,Western Blot技术检测SRA蛋白表达量。结果:与正常组比较,对照组与模型组的细胞凋亡率差异有统计学意义(P<0.01);低剂量观察组与模型组细胞凋亡率差异无统计学意义;中、高剂量观察组与模型组相比细胞凋亡率差异有统计学意义(P<0.01)。LPS对照组较Ac-LDL对照组的SRA含量显著增高(P<0.05),与黄芩苷低、中、高剂量组相比SRA表达量无统计学差异。结论:SRA信号通路参与了LPS和Ac-LDL双重因素诱导的巨噬细胞凋亡,并且SRA通路蛋白的激活主要与LPS干预相关。
