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| 1 | Performance analysis of reconfigurable intelligent surface assisted systems under channel aging显示文摘Reconfigurable intelligent surfaces(RISs)have attracted significant attention due to their capability in customizing wireless communication environments to improve system performance.In this study,we investigate the performance of an RIS-assisted multi-user multiple-input single-output wireless communication system,considering the impact of channel aging caused by users’relative movements.In particular,first,we propose a model incorporating the joint effects of channel aging and channel estimation errors to investigate the performance of the RIS-assisted system.Then,we derive novel closed-form expressions for characterizing the sum spectral efficiency with zero-forcing precoding.From our analysis,we unveil that an increase in the temporal channel correlation coefficient,the number of base station antennas,and the received power at the users could help improve system performance.Furthermore,increasing the number of reflecting elements M of the RIS generally yields a good system performance,but with a diminishing return when M is sufficiently large.Finally,simulation results are presented to validate the accuracy of the analytical results. | Yan Zhang Jiayi Zhang Derrick Wing Kwan Ng Huahua Xiao Bo Ai | 2022 | Intelligent and Converged Networks2022，3，1： | 1 |
| 2 | Prevalence of silent kidney disease in Hong Kong:the sdreening for Hong Kong Aaymp- tomatic Renal Populayion and Evaluation (SHARE)program显示文摘 | Li P K Kwan B C Leung C B et aI | 2005 | Kidney Int Suppl2005，94，： | 1 |
| 3 | Endothelium-dependent vasorelaxant effects of the aqueous extracts of the Eucorrrria ulrooides leaf and bark: Il'T'pIications on their antihypertensive action显示文摘 | KWAN e Y OiEN ex DEYAMA T et aI | 2004 | Vascular PharmacoI2004，11，24： | 1 |
| 4 | Acute subdural hematoma in infancy 显示文摘 | Loh JK Lin CL Kwan AI | 2002 | Surg Neurol2002，58，34： | 1 |
| 5 | Split-bolus MDCT urography with synchronous nephrographic and excretory phase enhancement显示文摘 | Chow LC Kwan SW Olcott EW et ai | 2007 | AJR Am J Roentgenol2007，189，2： | 1 |
| 6 | Oral calcitriol for the treatment of persistent proteinuria inimmunoglobulin A nephropathy:an uncon- trolled trial显示文摘 | Szeto CC Chow KM Kwan BC et ai | 2008 | Am J KidneyDis2008，51，5： | 1 |
| 7 | Social networks, social support mechanisms, and quality of life after breast cancer diagnosis 显示文摘 | Kroenke CH Kwan ML Neugut AI | 2013 | Breast Cancer Res Treat2013，139，2： | 1 |
| 8 | Feeling sad and useless: an investigation into personal acceptance of di- sability and its association with depression following stroke显示文摘 | Townend E Tinson D Kwan J et ai | 2010 | Clin Rehabil2010，24，6： | 1 |
| 9 | Social networks, social support mechanisms,and quality of life after breast cancer diagno- sis显示文摘 | Kroenke CH Kwan ML Neugut AI | 2013 | Breast Cancer Research And Treatment2013，139，2： | 1 |
| 10 | Two-dimensional ferromagnetic superlattices显示文摘Mechanically exfoliated two-dimensional ferromagnetic materials(2D FMs)possess long-range ferromagnetic order and topologically nontrivial skyrmions in few layers.However,because of the dimensionality effect,such few-layer systems usually exhibitmuch lower Curie temperature(TC)compared to their bulk counterparts.It is therefore of great interest to explore effective approaches to enhance their TC,particularly in wafer-scale for practical applications.Here,we report an interfacial proximity-induced high-TC 2D FM Fe3GeTe2(FGT)via A-type antiferromagnetic material CrSb(CS)which strongly couples to FGT.A superlattice structure of(FGT/CS)n,where n stands for the period of FGT/CS heterostructure,has been successfully produced with sharp interfaces by molecular-beam epitaxy on 2-inch wafers.By performing elemental specific X-ray magnetic circular dichroism(XMCD)measurements,we have unequivocally discovered that TC of 4-layer Fe3GeTe2 can be significantly enhanced from 140 K to 230 K because of the interfacial ferromagnetic coupling.Meanwhile,an inverse proximity effect occurs in the FGT/CS interface,driving the interfacial antiferromagnetic CrSb into a ferrimagnetic state as evidenced by double-switching behavior in hysteresis loops and the XMCD spectra.Density functional theory calculations show that the Fe-Te/Cr-Sb interface is strongly FMcoupled and doping of the spin-polarized electrons by the interfacial Cr layer gives rise to the TC enhancement of the Fe3GeTe2 films,in accordance with our XMCDmeasurements.Strikingly,by introducing rich Fe in a 4-layer FGT/CS superlattice,TC can be further enhanced to near room temperature.Our results provide a feasible approach for enhancing the magnetic order of few-layer 2D FMs in wafer-scale and render opportunities for realizing realistic ultra-thin spintronic devices. | Shanshan Liu Ke Yang Wenqing Liu Enze Zhang Zihan Li Xiaoqian Zhang Zhiming Liao Wen Zhang Jiabao Sun Yunkun Yang Han Gao Ce Huang Linfeng Ai Ping Kwan Johnny Wong Andrew Thye Shen Wee Alpha TN’Diaye Simon AMorton Xufeng Kou Jin Zou Yongbing Xu Hua Wu Faxian Xiu | 2020 | National Science Review2020，7，4： | 0 |
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