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
Diastasis Recti Abdominis(DRA)is the separation of abdominal recti muscles which occurs in women during their pregnancy and postpartum time.This is because of the stretching of the linea alba,a fibrous connective tiss...Diastasis Recti Abdominis(DRA)is the separation of abdominal recti muscles which occurs in women during their pregnancy and postpartum time.This is because of the stretching of the linea alba,a fibrous connective tissue on the abdominal wall.The Linea Alba is elastic and retracts back after the delivery of the baby.When this tissue gets overstretched,it loses its elasticity and the gap in the abdominals may not be closed leading to DRA.The motive of this research is to analyze the postpartum rehabilitation for signals from Inertial Measurement Unit(IMU)sensors.The conservative treatment for women who are experiencing DRA is given in the form of physiotherapy.These physiotherapy exercises focus on the recti abdominis muscle to bring back the Linea alba together.It will be a difficult process for the physiotherapist to monitor,whether patients did the exercises correctly or not.If the exercises are not correct,they will not be effective in the reduction of inter-recti distance.This research aims to analyze the effectiveness of IMU signals in classifying the correct and incorrect exercises.It was inferred that the IMU signals are effective in classifying the correct and incorrect exercises with an accuracy of 92%.展开更多
This paper proposes a new dielectric resonator antenna(DRA)design that can generate circularly polarized(CP)triple-band signals.Atripleband CP DRA antenna fed by a probe feed system is achieved with metal strips struc...This paper proposes a new dielectric resonator antenna(DRA)design that can generate circularly polarized(CP)triple-band signals.Atripleband CP DRA antenna fed by a probe feed system is achieved with metal strips structure on side of DRA structure.The design start with conventional rectangular DRA with F shaped metal strips on DRA structure alongside the feed.Then,the F metal strip is enhanced by extending the length of the metal strip to obtain wider impedance bandwidth.Further improvement on the antenna performance is observed by improvised the conventional DRA structure.The method of removing part of DRA bottom resulted to higher antenna gain with triple band CP.The primary features of the proposed DRA include wide impedance matching bandwidth(BW)and broadband circular polarization(CP).The primary features of the proposedDRAinclude wide impedance matching bandwidth(BW)and broadband circular polarization(CP).The CP BW values recorded by the proposed antenna were∼11.27%(3.3–3.65 GHz),12.18%(4.17–4.69 GHz),and 1.74%(6.44–6.55 GHz)for impedance-matching BW values of 35.4%(3.3–4.69 GHz),1.74%(5.36–5.44 GHz),and 1.85%(6.41–6.55 GHz)with peak gains of 6.8 dBic,7.6 dBic,and 8.5 dBic,respectively,in the lower,central,and upper bands.The prototype of the proposed antenna geometry was fabricated and measured.A good agreement was noted between the simulated and the measured results.展开更多
DRA 基因属 BoLA 家族Ⅱ类基因，编码Ⅱ类抗原分子的α链，其第2外显子编码的抗原结合区在抗原呈递中发挥重要作用。以天祝白牦牛、大通牦牛、甘南牦牛和普通牛为研究对象，利用 PCR-SSCP 的方法对 BoLA-DRA 基因第2外显子及第2内含子...DRA 基因属 BoLA 家族Ⅱ类基因，编码Ⅱ类抗原分子的α链，其第2外显子编码的抗原结合区在抗原呈递中发挥重要作用。以天祝白牦牛、大通牦牛、甘南牦牛和普通牛为研究对象，利用 PCR-SSCP 的方法对 BoLA-DRA 基因第2外显子及第2内含子多态性进行了检测。结果表明，DRA 基因第2外显子区检测到197位 T ＞C 和116位 G ＞A 突变，对应 A、B 和 C 3种等位基因，PIC 值为0．249～0．424，为中度多态。第2内含子区发现1个 A ＞G、1个 T ＞C突变和1个 C ＞T 突变，对应 a、b、c 和 d 4种等位基因，PIC 值为0．389～0．515，为中度及高度多态。聚类分析表明，牦牛 DRA 基因第2外显子区碱基序列与普通牛以及山羊的同源性最高，系统进化情况与它们亲缘关系远近一致。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.
基金This research was funded by the Department of Science and Technology DST under Biomedical Device and Technology Development(File No:TDP/BDTD/07/2021).
文摘Diastasis Recti Abdominis(DRA)is the separation of abdominal recti muscles which occurs in women during their pregnancy and postpartum time.This is because of the stretching of the linea alba,a fibrous connective tissue on the abdominal wall.The Linea Alba is elastic and retracts back after the delivery of the baby.When this tissue gets overstretched,it loses its elasticity and the gap in the abdominals may not be closed leading to DRA.The motive of this research is to analyze the postpartum rehabilitation for signals from Inertial Measurement Unit(IMU)sensors.The conservative treatment for women who are experiencing DRA is given in the form of physiotherapy.These physiotherapy exercises focus on the recti abdominis muscle to bring back the Linea alba together.It will be a difficult process for the physiotherapist to monitor,whether patients did the exercises correctly or not.If the exercises are not correct,they will not be effective in the reduction of inter-recti distance.This research aims to analyze the effectiveness of IMU signals in classifying the correct and incorrect exercises.It was inferred that the IMU signals are effective in classifying the correct and incorrect exercises with an accuracy of 92%.
文摘This paper proposes a new dielectric resonator antenna(DRA)design that can generate circularly polarized(CP)triple-band signals.Atripleband CP DRA antenna fed by a probe feed system is achieved with metal strips structure on side of DRA structure.The design start with conventional rectangular DRA with F shaped metal strips on DRA structure alongside the feed.Then,the F metal strip is enhanced by extending the length of the metal strip to obtain wider impedance bandwidth.Further improvement on the antenna performance is observed by improvised the conventional DRA structure.The method of removing part of DRA bottom resulted to higher antenna gain with triple band CP.The primary features of the proposed DRA include wide impedance matching bandwidth(BW)and broadband circular polarization(CP).The primary features of the proposedDRAinclude wide impedance matching bandwidth(BW)and broadband circular polarization(CP).The CP BW values recorded by the proposed antenna were∼11.27%(3.3–3.65 GHz),12.18%(4.17–4.69 GHz),and 1.74%(6.44–6.55 GHz)for impedance-matching BW values of 35.4%(3.3–4.69 GHz),1.74%(5.36–5.44 GHz),and 1.85%(6.41–6.55 GHz)with peak gains of 6.8 dBic,7.6 dBic,and 8.5 dBic,respectively,in the lower,central,and upper bands.The prototype of the proposed antenna geometry was fabricated and measured.A good agreement was noted between the simulated and the measured results.
文摘DRA 基因属 BoLA 家族Ⅱ类基因，编码Ⅱ类抗原分子的α链，其第2外显子编码的抗原结合区在抗原呈递中发挥重要作用。以天祝白牦牛、大通牦牛、甘南牦牛和普通牛为研究对象，利用 PCR-SSCP 的方法对 BoLA-DRA 基因第2外显子及第2内含子多态性进行了检测。结果表明，DRA 基因第2外显子区检测到197位 T ＞C 和116位 G ＞A 突变，对应 A、B 和 C 3种等位基因，PIC 值为0．249～0．424，为中度多态。第2内含子区发现1个 A ＞G、1个 T ＞C突变和1个 C ＞T 突变，对应 a、b、c 和 d 4种等位基因，PIC 值为0．389～0．515，为中度及高度多态。聚类分析表明，牦牛 DRA 基因第2外显子区碱基序列与普通牛以及山羊的同源性最高，系统进化情况与它们亲缘关系远近一致。
