| 1 | Evolution of dielectric loss-dominated electromagnetic patterns in magnetic absorbers for enhanced microwave absorption performances显示文摘As the growing criterion of electromagnetic wave (EMW) absorption materials, micro/nano-scale magnetic materials are drawing more and more attention for their unique features compared to bulky absorbers. Generally, the complex permeability of micro/nano-scale magnetic absorbers varies in a relatively narrow range, whatever for the storage of magnetic energy or the dissipation of magnetic energy. If so, how the small variation of permeability affects the ultimate performances is still unclear. Here, a strategy of electromagnetic parameters regulation for the magnetic materials is applied to understand the loss contribution in micro/nanoscale magnetic absorbers. After analyzing the evolution of electromagnetic maps of ten ferrosoferric oxide samples, it can be found that the dissipation contribution of permeability for magnetic materials is weaker than that of permittivity, in spite of its significant role in determining the impedance matching characteristics. In summary, this work systematically explores the loss contribution in micro/nano-magnetic absorbers for the first time, which is of great importance in designing and optimizing the microwave absorption properties of magnetic absorbers. | Xiaogu Huang Man Qiao Xiaochi Lu Yafei Li Yabin Ma Bo Kang Bin Quan Guangbin Ji | 2021 | Nano Research2021，14，11： | 4 |
| 2 | High-Order Characteristic Modes Suppression for Cross-Band Decoupling in Shared-Aperture Antenna Array显示文摘In dual-band shared-aperture base station antennas,the secondary radiation(SR)field caused by cross-band couplings always leads to radiation pattern distortion.In this work,the SR field caused by the coupling is attributed to the excitation of the target highorder modes from the perspective of the characteristic mode.To effectively suppress the target modes,L-shaped slots are proposed to load the arms of the radiator and altering the current paths.As compared with conventional dipoles without L-shaped slots,the proposed antenna generates less SR field.Therefore,the radiation pattern of the high-band antennas keeps stable in a dual-band shared-aperture antenna array environment.Prototype of a dual-band antenna array consisting of the proposed lowband(LB)antenna and a 4×4 high-band(HB)antenna array is fabricated.Simulated and measured results show that the designed dual-band array operates at both 0.74–0.82 GHz and 3.30–3.80 GHz.The experimental results verify that the cross-band decoupling has been achieved with the high-order mode suppression. | LU Xiaochi CHEN Yikai SHEN Tongsheng GUO Shaojun ZOU Chunrong YANG Shiwen | 2022 | Chinese Journal of Electronics2022，31，6： | 0 |
| 3 | Neferine inhibits the progression of diabetic nephropathy by modulating the miR-17-5p/nuclear factor E2-related factor 2 axis显示文摘OBJECTIVE:To investigate the effect of Neferine(Nef)on diabetic nephropathy(DN)and to explore the mechanism of Nef in DN based on miRNA regulation theory.METHODS:A DN mouse model was constructed and treated with Nef.Serum creatinine(Crea),blood urea(UREA)and urinary albumin were measured in mice by kits,and renal histopathological changes and fibrosis were observed by hematoxylin-eosin staining and Masson staining.Renal tissue superoxide dismutase(SOD),malondialdehyde(MDA)and glutathione peroxidase(GSH-Px)activities were measured by enzyme-linked immunosorbent assay(ELISA).Western blotting was used to detect the expression of nuclear factor E2-related factor 2(Nrf2)/heme oxygenase 1(HO-1)signaling pathway-related proteins in kidney tissues.Quantitative reverse transcription-polymerase chain reaction(q RT-PCR)was used to detect the expression of miR-17-5p in kidney tissues.Subsequently,a DN in vitro model was constructed by high glucose culture of human mesangial cells(HMCs),cells were transfected with miR-17-5p mimic and/or treated with Nef,and we used q RTPCR to detect cellular miR-17 expression,flow cytometry to detect apoptosis,ELISAs to detect cellular SOD,MDA,and GSH-Px activities,Western blots to detect Nrf2/HO-1 signaling pathway-related protein expression,and dual luciferase reporter gene assays to verify the targeting relationship between Nrf2 and miR-17-5p.RESULTS:Administration of Nef significantly reduced the levels of blood glucose,Crea,and UREA and the expression of miR-17-5p,improved renal histopathology and fibrosis,significantly reduced MDA levels,elevated SOD and GSH-Px activities,and activated Nrf2 expression in kidney tissues from mice with DN.Nrf2 is a post-transcriptional target of miR-17-5p.In HMCs transfected with miR-17-5p mimics,the m RNA and protein levels of Nrf2 were significantly suppressed.Furthermore,miR-17-5p overexpression and Nef intervention resulted in a significant increase in high glucose-induced apoptosis and MDA levels in HMCs and a significant decrease in the protein expression of HO-1 and Nrf2.CONCLUSION:Collectively,these results indicate that Nef has an ameliorative effect on DN,and the mechanism may be through the miR-17-5p/Nrf2 pathway. | HUANG Hongmei YANG Maojun LI Ting WANG Dandan LI Ying TANG Xiaochi YUAN Lu GU Shi XU Yong | 2024 | Journal of Traditional Chinese Medicine2024，44，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员