检索结果-南通市图书馆

Joint Pilot Design and Beamforming Optimization in Massive MIMO Surveillance Systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2022年第4期19卷 83-97页

作者： Caihong Kai Xiangru Zhang xinyue hu Wei huang School of Computer Science and Information Engineering Hefei University of TechnologyHefei 230601China Intelligent Interconnected Systems Laboratory of Anhui Province Hefei University of TechnologyHefei 230601China School of Electronics and Information Engineering Anhui UniversityHefei 230601China

This paper proposes a novel joint channel estimation and beamforming scheme for the massive multiple-input-multiple-output(MIMO)frequency-division duplexing(FDD) wireless legitimate surveillance system. With the proposed scheme,the monitor with the full duplex capability realizes the proactive eavesdropping of the suspicious link by leveraging the pilot attack approach. Specifically, exploiting the effective eavesdropping rate and the mean square error as performance metrics and setting a total power budget at the training and transmission phases,while guaranteeing the information from suspicious source can be successfully decode, joint pilot design,power allocation and beamforming strategy are formulated as optimization problems for the two objective functions: MSE and effective eavesdropping rate. A closed-form expression of the optimal pilot with the limited length can be obtained via the channel correlation. The optimal power problem at the training phase can be solved by a simple bisection method. Then,based on the obtained imperfect estimated channel,the jamming beamforming at monitor optimization algorithm is proposed by utilizing the convex Semidefinite Programming approach to maximize the effective eavesdropping rate. Numerical results show that the proposed joint pilot design, power allocation and beamforming optimization scheme can improve the surveillance performance of the legitimate monitor as compared to the existing passive eavesdropping and jamming-assisted eavesdropping.

关键词： proactive eavesdropping massive MIMO channel estimation pilot contamination beamforming

Hyperbranched Supramolecular Polymer of Tris(permethyl-β- cyclodextrin)s with Porphyrins: Characterization and Magnetic Resonance Imaging

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2014年第8期32卷 771-776页

作者： Mo Sun Hengyi Zhang xinyue hu Bowen Liu Yu Liu Department of Chemistry State Key Laboratory of Elemento-Organic ChemistryNankai UniversityCollaborative Innovation Center of Chemical Science and EngineeringTianjin 300071China

A hyperbranched supramolecular polymer(HSP)is constructed based on the intermolecular inclusion complexation of bridged tris(permethyl-β-cyclodextrin)with Mn^(Ⅲ)-porphyrin bearing poly(ethylene glycol)(PEG)side chains(Mn^(Ⅲ)-TPP),and characterized by UV/vis absorption spectroscopy,isothermal titration calorimetry(ITC),NMR,dynamic light scattering(DLS),atomic force microscopy(AFM)and transmission electron microscopy(TEM),*** presence of permethyl-β-cyclodextrin can stabilize the low-valent Mn^(II)-*** vitro cell experiment indicates that this HSP has no remarkable cellular toxicity against NIH 3T3 *** vitro MR imaging experiment indicates a slightly increased T_(1) relaxivity for this HSP compared to that for the linear supramolecular polymer.

关键词： hyperbranched supramolecular polymer host-guest system cyclodextrin Mn-porphyrin MRI

Does ＂lnternet Plus＂ Promote New Export Space for Firms？ Evidence from China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China & World Economy 2018年第6期26卷 50-71页

作者： Xianhai huang Xueyin Song xinyue hu School of Economics Zhejiang University China School of Economics Hangzhou Dianzi University China

Based on data from the Chinese Industrial Enterprises Database, this paper investigates the effect of ＂Internet Plus＂ on the trade destination mix at the enterprise level The analysis extends the classic dual margins to three dimensions： destination extensive, destination intensive and destination structural margins. The paper suggests that connecting to the internet not only raises Chinese firms＇propensity to export, but also extends the destination extensive margin. In addition, Internet Plus could create a synergistic effect for internet-enabled enterprises, that is, the development of the destination country＇s internet access benefits domestic firms＇export participation. Finally, the paper finds that lnternet Plus, rather than increasing the intensive or structural margins, leads to the transfer of exports to lower-middle-income countries and helps firms achieve competitiveness and thus increases their profit. The paper provides an explanatory mechanism and empirical evidence for firms ＇use of the internet to optimize export space.

关键词： extensive margin intensive margin intemet structural margin trade

Design,synthesis and bioassay of the emerging photo-responsive fungicides

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第8期34卷 223-226页

作者： Wen Fu xinyue hu Qinglong Yuan Zhiping Xu Jiagao Cheng Zhong Li Xusheng Shao Shanghai Key Laboratory of Chemical Biology School of PharmacyEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai 200237China Shanghai Frontier Science Research Base of Optogenetic Techniques for Cell Metabolism School of PharmacyEast China University of Science and TechnologyShanghai 200237China Engineering Research Center of Pharmaceutical Process Chemistry Ministry of EducationSchool of PharmacyEast China University of Science and TechnologyShanghai 200237China

Precise and spatiotemporal control over the pesticide remains to be a *** efficient controlled release systems(CRSs)have been developed to support the precise delivery of active ***,we incorporated the photoremovable protecting groups(PRPGs)into phenamacril(PHE)and obtained two photo-responsive fungicides of NV-PHE and *** 4,5-dimethoxy-o-nitrobenzyl(NV)or 7-diethylaminocoumarin(DEACM)-caged PHE could release the active molecule PHE after irradiation of UV light and blue light,*** properties and in-vitro/vivo fungicidal activities of NV-PHE and DEACM-PHE demonstrated the feasibility for light controlled release of ***-PHE could release 98%PHE by illumination of blue *** irradiated DEACM-PHE could preserve the similar bioactivity of PHE,and significantly improve the in-vitro/vivo fungicidal activities compared to the non-irradiated *** optical controlled release of PHE from DEACM-PHE enabled the precise and spatiotemporal delivery of PHE,diversifying the development of CRSs for pesticide,and providing environmentfriendly agricultural applications with high pesticide efficiency.

关键词： Phenamacril Controlled release Photoremovable protecting groups Spatiotemporal Significant difference

Structural covariance network of the hippocampus–amygdala complex in medication-nale patients with first-episode major depressive disorder

在线全文

学校读者我要写书评

暂无评论

Psychoradiology 2022年第4期2卷 190-198页

作者： Lianqing Zhang xinyue hu Yongbo hu Mengyue Tang hui Qiu Ziyu Zhu Yingxue Gao Hailong Li Weihong Kuang Weidong Ji Functional and molecular imaging Key Laboratory of Sichuan Province West China HospitalSichuan UniversityChengdu 610041PR China Department of Radiology West China Hospital of Sichuan UniversityChengdu 610041PR China Department of Psychiatry West China Hospital of Sichuan UniversityChengdu 610041PR China Shanghai Key Laboratory of Mental Health and Psychological Crisis Intervention School of Psychology and Cognitive Science and Affiliated Mental Health CenterEast China Normal UniversityShanghai 200335China Child Psychiatry Shanghai Changning Mental Health CenterShanghai 200335China

Background The hippocampus and amygdala are densely interconnected structures that work together in multiple affective and cognitive processes that are important to the etiology of major depressive disorder(MDD).Each of these structures consists of several heterogeneous *** aim to explore the topologic properties of the volume-based intrinsic network within the hippocampus–amygdala complex in medication-nale patients with first-episode *** High-resolution T1-weighted magnetic resonance imaging scans were acquired from 123 first-episode,medication-nale,and noncomorbid MDD patients and 81 age-,sex-,and education level-matched healthy control participants(HCs).The structural covariance network(SCN)was constructed for each group using the volumes of the hippocampal subfields and amygdala subregions;the weights of the edges were defined by the partial correlation coefficients between each pair of subfields/subregions,controlled for age,sex,education level,and intracranial *** global and nodal graphmetrics were calculated and compared between *** Compared with HCs,the SCN within the hippocampus–amygdala complex in patients with MDD showed a shortened mean characteristic path length,reduced modularity,and reduced small-worldness *** the nodal level,the left hippocampal tail showed increased measures of centrality,segregation,and integration,while nodes in the left amygdala showed decreased measures of centrality,segregation,and integration in patients with MDD compared with *** Our results provide the first evidence of atypical topologic characteristics within the hippocampus–amygdala complex in patients with MDD using structure network *** provides more delineate mechanism of those two structures that underlying neuropathologic process in MDD.

关键词： Major depressive disorder hippocampus-amygdala complex structural covariance network global network metrics local network metrics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于量子区块链的食品冷链追溯系统构建

食品科学 2022年第15期43卷 294-301页

作者：何静胡鑫月上海海洋大学经济管理学院上海201306

疫情防控背景下,冷链食品质量安全备受关注,但当前食品冷链追溯系统建设不完善,仍存在缺乏信任、信息不对称、追溯环节缺失等问题,针对这些问题,本文提出基于量子区块链的食品冷链追溯系统构建思路。在量子区块链中,区块中的记录被编码... 详细信息

疫情防控背景下,冷链食品质量安全备受关注,但当前食品冷链追溯系统建设不完善,仍存在缺乏信任、信息不对称、追溯环节缺失等问题,针对这些问题,本文提出基于量子区块链的食品冷链追溯系统构建思路。在量子区块链中,区块中的记录被编码成一连串彼此缠绕的量子,运用量子密钥分发技术代替传统区块链非对称加密传输,以量子签名进行身份验证,形成纠缠量子态对照效应,达成量子共识,保证任意节点之间数据传输的真实性,防止数据被篡改。结合分布式存储、智能合约等技术实现追溯系统所有节点共同参与、共同维护。从冷链信息采集业务层、网络数据管理层以及系统应用层3个层级对冷链追溯系统进行构建,并进一步探讨系统运行机制。本文欲利用量子通信技术充分发挥区块链优势,从而更好地解决当前冷链食品追溯面临的困境,为探索构建真实高效、可持续实施的食品安全追溯系统提供参考。

关键词：量子区块链食品冷链追溯系统量子密钥分发

Application of Stone Landscape Materials in Liberation Park of Wuhan

在线全文

学校读者我要写书评

暂无评论

Journal of Landscape Research 2019年第5期11卷 29-31页

作者： ZHANG Xinyang PAN Xiangcheng hu xinyue Wuhan Institute of Design and Sciences WuhanHubei 430205China Hankou University WuhanHubei 430212China

With the continuous development of landscape design,landscape materials are also constantly *** application and development of stone as an ancient material is constantly developing with the human’s increasing understanding on *** investigating the application of stone materials in the landscape industry,this paper finds that the application of stone is mostly in the field of architecture and that the standard reference for the field of landscape garden is not ***,this paper takes Liberation Park in Wuhan for example to investigate and study the application of stone in landscape design,which can provide useful guidance for more scientific and rational selection of stone materials in the process of landscape design and construction.

关键词： Stone materials Liberation Park Application

Extracellular vesicles from human urine-derived stem cells delay aging through the transfer of PLAU and TIMP1

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2024年第3期14卷 1166-1186页

作者： Shanshan Rao Zehui He Zun Wang Hao Yin Xiongke hu Yijuan Tan Tengfei Wan Hao Zhu Yi Luo Xin Wang Hongming Li Zhenxing Wang xinyue hu Chungu Hong Yiyi Wang Mingjie Luo Wei Du Yuxuan Qian Siyuan Tang hui Xie Chunyuan Chen Department of Orthopedics Movement System Injury and Repair Research CenterXiangya HospitalCentral South UniversityChangsha 410008China hunan Key Laboratory of Angmedicine Changsha 410008China Xiangya School of Nursing Central South UniversityChangsha 410013China Department of Pediatric Orthopedics Hunan Children’s HospitalUniversity of South ChinaChangsha 410007China Department of Respiratory Medicine Xiangya HospitalCentral South UniversityChangsha 410008China School of Nursing Xinjiang Medical UniversityUrumqiXinjiang 830000China Department of Rehabilitation Xiangya HospitalCentral South UniversityChangsha 410008China National Clinical Research Center for Geriatric Disorders Xiangya HospitalCentral South UniversityChangsha 410008China

Aging increases the risks of various diseases and the vulnerability to *** senescence is a hallmark of aging that contributes greatly to aging and aging-related *** study demonstrates that extracellular vesicles from human urine-derived stem cells(USC-EVs)efficiently inhibit cellular senescence in vitro and in *** intravenous injection of USC-EVs improves cognitive function,increases physical fitness and bone quality,and alleviates aging-related structural changes in different organs of senescence-accelerated mice and natural aging *** anti-aging effects of USC-EVs are not obviously affected by the USC donors’ages,genders,or health *** analysis reveals that USC-EVs are enriched with plasminogen activator urokinase(PLAU)and tissue inhibitor of metalloproteinases 1(TIMP1).These two proteins contribute importantly to the anti-senescent effects of USC-EVs associated with the inhibition of matrix metalloproteinases,cyclin-dependent kinase inhibitor 2A(P16INK4a),and cyclin-dependent kinase inhibitor 1A(P21cip1).These findings suggest a great potential of autologous USC-EVs as a promising anti-aging agent by transferring PLAU and TIMP1 proteins.

关键词： Extracellular vesicles Urine-derived stem cells Cellular senescence Anti-aging PLAU TIMP1 Senescence-accelerated mice Natural aging mice

Emerging probing perspective of two-dimensional materials physics:terahertz emission spectroscopy

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第7期13卷 1278-1298页

作者： Yifei Wu Yuqi Wang Di Bao Xiaonan Deng Simian Zhang Lin Yu-chun Shengxian Ke Jianing Liu Yingjie Liu Zeli Wang Pingren Ham Andrew Hanna Jiaming Pan xinyue hu Zhengcao Li Ji Zhou Chen Wang State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials of Ministry of EducationSchool of Materials Science and EngineeringTsinghua University100084 BeijingChina Beijing Advanced Innovation Center for Integrated Circuits 100084 BeijingChina

Terahertz(THz)emission spectroscopy(TES)has emerged as a highly effective and versatile technique for investigating the photoelectric properties of diverse materials and nonlinear physical processes in the past few ***,research on two-dimensional(2D)materials has experienced substantial growth due to their atomically thin structures,exceptional mechanical and optoelectronic properties,and the potential for applications in flexible electronics,sensing,and ***,these materials offer advantages such as tunable bandgap,high carrier mobility,wideband optical absorption,and relatively short carrier *** applying TES to investigate the 2D materials,their interfaces and heterostructures,rich information about the interplay among photons,charges,phonons and spins can be unfolded,which provides fundamental understanding for future *** it is timely to review the nonlinear processes underlying THz emission in 2D materials including optical rectification,photon-drag,high-order harmonic generation and spin-to-charge conversion,showcasing the rich diversity of the TES employed to unravel the complex nature of these *** applications based on THz emissions,such as THz lasers,ultrafast imaging and biosensors,are also *** further,we analyzed the unique advantages of spintronic terahertz emitters and the future technological advancements in the development of new THz generation mechanisms leading to advanced THz sources characterized by wide bandwidth,high power and integration,suitable for industrial and commercial *** continuous advancement and integration of TES with the study of 2D materials and heterostructures promise to revolutionize research in different areas,including basic materials physics,novel optoelectronic devices,and chips for post-Moore’s era.

关键词： optoelectronic versatile exceptional