Dielectric resonator magnetoelectric dipole(DRMED)arrays with enhanced isolation,reduced cross-polarization,and backward radiation are proposed for base station(BS)applications.The proposed antenna comprises an elevat...Dielectric resonator magnetoelectric dipole(DRMED)arrays with enhanced isolation,reduced cross-polarization,and backward radiation are proposed for base station(BS)applications.The proposed antenna comprises an elevated dielectric resonator antenna(DRA)on a small metal plate above a sizeable common ground plane.The DRA is designed in its T Eδ11 mode,acting like a magnetic dipole.The surface current excited by the differential probes flowing on the small ground plane is equivalent to an electric dipole.Since these two equivalent dipoles are orthogonal,they have the magnetoelectric dipole characteristics with reduced backward radiation.Meanwhile,the small ground planes can be treated as decoupling structures to provide a neutralization path to cancel the original coupling path.A linearly-polarized 4-element prototype array was verified experimentally in previous work.Here,a dual-polarized DRMED antenna is presented to construct a 2-element and 4×4 array for BS applications.To investigate its MIMO performance,sophisticated multi-cell scenario simulations are carried out.By using the proposed dualpolarized DRMED array,the cellular system capacityis improved by 118.6%compared to a conventional DRA array.This significant MIMO system improvement is mainly due to the reduced backward radiation and,therefore,reduced inter-cell interferences.Measurements align well with the simulations.展开更多
目的探讨吉兰-巴雷综合征(Guillain-Barrésyndrome,GBS)患者外周血记忆性T细胞和记忆性B细胞亚群的变化及其临床意义。方法选取2018年6月至2020年12月于徐州医科大学附属医院神经内科住院的16例GBS患者作为研究组,并选取同期16名...目的探讨吉兰-巴雷综合征(Guillain-Barrésyndrome,GBS)患者外周血记忆性T细胞和记忆性B细胞亚群的变化及其临床意义。方法选取2018年6月至2020年12月于徐州医科大学附属医院神经内科住院的16例GBS患者作为研究组,并选取同期16名来院的健康体检者作为对照组。流式细胞术检测两组入选者的外周血T细胞亚群,包括CD4^(+)初始T细胞(naive T cells,TN)、CD4^(+)中央记忆性T细胞(central memory T cells,TCM)、CD4^(+)效应记忆性T细胞(effector memory T cells,TEM)和CD4^(+)终末分化效应记忆性T细胞(terminally differentiated effector memory T cells,TEMRA)及记忆性B细胞、浆母细胞的占比并分析其临床价值。结果与对照组相比,研究组患者的CD4^(+)TN及CD8^(+)TN均明显下降(P<0.05),CD4^(+)TEM及CD8^(+)TEM均明显升高(P<0.05),TCM及TEMRA在CD4和CD8上的比例比较,差异无统计学意义(P>0.05)。与对照组相比,研究组记忆性B细胞比例明显升高(P<0.05),两组患者间浆母细胞占比比较,差异无统计学意义(P>0.05)。GBS患者外周血CD4^(+)TEM及CD8^(+)TEM占比与Hughes残疾评分、脑脊液蛋白、脑脊液免疫球蛋白G及记忆性B细胞占比均呈正相关(P<0.05)。结论GBS患者存在记忆性T细胞和记忆性B细胞亚群免疫紊乱,CD4^(+)TEM细胞、CD8^(+)TEM细胞及记忆性B细胞占比升高,这很可能是GBS发病过程中重要的外周免疫机制。展开更多
基金supported by the National Key Research and Development Program of China under Grant 2020YFA0709800.
文摘Dielectric resonator magnetoelectric dipole(DRMED)arrays with enhanced isolation,reduced cross-polarization,and backward radiation are proposed for base station(BS)applications.The proposed antenna comprises an elevated dielectric resonator antenna(DRA)on a small metal plate above a sizeable common ground plane.The DRA is designed in its T Eδ11 mode,acting like a magnetic dipole.The surface current excited by the differential probes flowing on the small ground plane is equivalent to an electric dipole.Since these two equivalent dipoles are orthogonal,they have the magnetoelectric dipole characteristics with reduced backward radiation.Meanwhile,the small ground planes can be treated as decoupling structures to provide a neutralization path to cancel the original coupling path.A linearly-polarized 4-element prototype array was verified experimentally in previous work.Here,a dual-polarized DRMED antenna is presented to construct a 2-element and 4×4 array for BS applications.To investigate its MIMO performance,sophisticated multi-cell scenario simulations are carried out.By using the proposed dualpolarized DRMED array,the cellular system capacityis improved by 118.6%compared to a conventional DRA array.This significant MIMO system improvement is mainly due to the reduced backward radiation and,therefore,reduced inter-cell interferences.Measurements align well with the simulations.
文摘目的探讨吉兰-巴雷综合征(Guillain-Barrésyndrome,GBS)患者外周血记忆性T细胞和记忆性B细胞亚群的变化及其临床意义。方法选取2018年6月至2020年12月于徐州医科大学附属医院神经内科住院的16例GBS患者作为研究组,并选取同期16名来院的健康体检者作为对照组。流式细胞术检测两组入选者的外周血T细胞亚群,包括CD4^(+)初始T细胞(naive T cells,TN)、CD4^(+)中央记忆性T细胞(central memory T cells,TCM)、CD4^(+)效应记忆性T细胞(effector memory T cells,TEM)和CD4^(+)终末分化效应记忆性T细胞(terminally differentiated effector memory T cells,TEMRA)及记忆性B细胞、浆母细胞的占比并分析其临床价值。结果与对照组相比,研究组患者的CD4^(+)TN及CD8^(+)TN均明显下降(P<0.05),CD4^(+)TEM及CD8^(+)TEM均明显升高(P<0.05),TCM及TEMRA在CD4和CD8上的比例比较,差异无统计学意义(P>0.05)。与对照组相比,研究组记忆性B细胞比例明显升高(P<0.05),两组患者间浆母细胞占比比较,差异无统计学意义(P>0.05)。GBS患者外周血CD4^(+)TEM及CD8^(+)TEM占比与Hughes残疾评分、脑脊液蛋白、脑脊液免疫球蛋白G及记忆性B细胞占比均呈正相关(P<0.05)。结论GBS患者存在记忆性T细胞和记忆性B细胞亚群免疫紊乱,CD4^(+)TEM细胞、CD8^(+)TEM细胞及记忆性B细胞占比升高,这很可能是GBS发病过程中重要的外周免疫机制。
