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Recent progress of hybrid cathode interface layer for organic solar cells

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Journal of Energy Chemistry 2024年第4期91卷 383-406页

作者： Jianru Wang Dan Zhou Zhentian Xu Yujie Pu Senmei Lan Fang Wang Feiyan Wu Bin hu Yongfen Tong Ruizhi Lv honglin Chu Lie Chen Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources RecycleNanchang Hangkong UniversityNanchang 330063JiangxiChina College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry(IPEC) Nanchang UniversityNanchang 330031JiangxiChina

Organic solar cells(OSCs)have gained conspicuous progress during the past few decades due to the development of materials and upgrading of the device structure.The power conversion efficiency(PCE)of the single-junction device had surpassed 19%.The cathode interface layer(CIL),by optimizing the connection between the active layer and the cathode electrode,has become a momentous part to strengthen the performances of the OSCs.Simultaneously,CIL is also indispensable to illustrating the working mechanism of OSCs and enhancing the stability of the OSCs.In this essay,hybrid CILs in OSCs have been summarized.Firstly,the advancement and operating mechanism of OSCs,and the effects and relevant design rules of CIL are briefly concluded;secondly,the significant influence of CIL on enhancing the stability and PCE of OSCs is presented;thirdly,the characteristics of organic hybrid CIL and organic-inorganic hybrid CIL are introduced.Finally,the conclusion and outlook of CIL are summarized.

关键词： Organic solar cells Theoperation mechanism Organic hybrid cathode interface layer Organic-inorganic hybrid CIL

Environmental Information-Aided Electromagnetic Propagation Testbed for Maritime Communication

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China Communications 2023年第3期20卷 302-315页

作者： Ting Zhou Yuzhen Wang Bilian Xu Tianheng Xu Xiaoming Tao honglin hu Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of ScienceBeijing 100049China School of Microelectronics Shanghai UniversityShanghai 200444China Department of Electronic Engineering Tsinghua UniversityBeijing 100084China

Maritime channel modeling can be affected by some key time-varying environmental factors.The ducting effect is one of the thorniest factors since it causes anomalous propagation enhancement and severe co-channel interference.Moreover,the atmospheric attenuation is much more severe in the ocean environment,resulting in shorter coverage distance and more link outage.In this paper,we propose an environmental information-aided electromagnetic propagation testbed.It is based on complex refractivity estimation and improved parabolic equation propagation model,taking into account both ducting effect and atmospheric attenuation.A large-scale temporal and spatial propagation measurement was conducted with meteorological acquisition.We consider practical path loss and ducting conditions to verify the testbed feasibility in these long-distance radio links.The simulation results are in good agreement with the measured data,which further reveal the basic temporal and spatial distribution of ducting effect at 3.5 GHz band.

关键词： broadband maritime communication maritime channel ducting effect electromagnetic propagation testbed propagation measurement atmospheric attenuation path loss

Brain-Computer-Interface Inspired Communications

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China Communications 2022年第2期19卷 I0002-I0004页

作者： honglin hu Xianfu Chen Tao Jiang 不详 the Department of Information Science and Electronic Engineering(ISEE)at Zhejiang University HangzhouChina the Wuhan National Laboratory for Optoelectronics School of Cyber Science and Engineering and School of Electronics Information and Communications Huazhong University of Science and TechnologyWuhanP.R.China

Following the massive commercialization of 5G mobile communication systems,both academia and industry are initiating research activities to shape the next-generation communication systems,namely,6G.Although the detailed killer-applications and key technologies of 6G have not been clearly defined yet,it is commonly expected that 6G will provide hypercoverage and hyper-connectivity.Enabled by these capabilities,the 6G communication systems are especially aiming at improving the user’s experi-ence greatly,or more ambitiously,to change the way of human’s everyday life.So far,many new services with more stringent requirements,such as truly immersive extended reali¬ty(XR),high-fidelity mobile hologram,and digital replica,are expected to be satisfied by the 6G communication systems.

关键词： communication Communications everyday

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China Communications 2022年第2期 4-6页

作者： honglin hu Xianfu Chen Tao Jiang IEEE Shanghai Section VTT Technical Research Centre of Finland IEEE Special Interest Group on Big Data with Computational Intelligence 4. IEEE Special Interest Group on AI Empowered Internet of Vehicles

Brain-Computer-Interface Inspired Communications Following the massive commercialization of 5G mobile communication systems, both academia and industry are initiating research activities to shape the next-generation communication systems, namely,6G. Although the detailed killer-applications and key technologies of 6 G have not been clearly defined yet,

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A new SSVEP-based BCI utilizing frequency and space to encode visual targets

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Science China(Information Sciences) 2020年第8期63卷 257-259页

作者： Min ZHANG Zhenyu WANG honglin hu Shanghai Advanced Research Institute Chinese Academy of Sciences University of Chinese Academy of Sciences School of Information Science and Technology ShanghaiT ech University

Dear editor,Brain-computer interfaces (BCIs) based on steadystate visual evoked potential (SSVEP) have attracted considerable attention from researchers owing to their improved performance, such as their higher recognition accuracy, more reliable relation to stimuli, and higher information transfer rate(ITR), compared with other types of BCIs.A major challenge for SSVEP-based BCIs is the

关键词： Brain-computer interface SSVEP EEG Quadratic Discriminant Analysis Information transfer rate

Fragmental Weight-Conservation Combining Scheme for Statistical Signal Transmissions under Fast Time-Varying Channels

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China Communications 2020年第1期17卷 118-128页

作者： Xingwei Wang Ting Zhou Tianheng Xu Songlin Feng honglin hu Yanliang Jin School of Communication and Information Engineering Shanghai UniversityShanghai 200444China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China

Statistical Signal Transmission(SST)is a technique based on orthogonal frequency-division multiplexing(OFDM)and adopts cyclostationary features,which can transmit extra information without additional bandwidth.However,the more complicated environment in 5G communication systems,especially the fast time-varying scenarios,will dramatically degrade the performance of the SST.In this paper,we propose a fragmental weight-conservation combining(FWCC)scheme for SST,to overcome its performance degradation under fast time-varying channels.The proposed FWCC scheme consists of three phases:1、incise the received OFDM stream into pieces;2、endue different weights for fine and contaminated pieces,respectively;3、combine cyclic autocorrelation function energies of all the pieces;and 4、compute the final feature and demodulate data of SST.Through these procedures above,the detection accuracy of SST will be theoretically refined under fast time-varying channels.Such an inference is confirmed through numerical results in this paper.It is demonstrated that the BER performance of proposed scheme outperforms that of the original scheme both in ideal channel estimation conditions and in imperfect channel estimation conditions.In addition,we also find the experiential optimal weight distribution strategy for the proposed FWCC scheme,which facilitates practical applications.

关键词： Cyclostationary features statistical signal transmission(SST) weight conservation time-varying channels

Flexible Uplink MU-MIMO Scheduling in UnlicensedSpectrum

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China Communications 2017年第12期14卷 59-71页

作者： Boqi Jia Ting Zhou honglin hu Yang Yang Zhenhong Li Sandrine Boumard Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai China Shanghai Research Center for Wireless Communication Shanghai China TCL Communication Technology Holdings Ltd. Shanghai R&D Center Shanghai China VTT Technical Research Centre of Finland Ltd Oulu Finland University of Chinese Academy of Sciences Beijing China

Utilizing the unlicensed spectrum as supplementary is being studied to meet the increasingly growing demand of user equipment for rate,traffic and bandwidth,and thus to mitigate the current spectrum scarcity crisis.In this paper,we investigate the uplink multi-user multiple-input multiple-output(UL MU-MIMO) technique to achieve multiplexing gain in unlicensed spectrum.We first define a new parameter called channel busy radio(CBR) which is related to the probability of occupying the unlicensed channel,and find that the failure to occupy the unlicensed channel leads to the performance degradation in unlicensed spectrum.Then,according to the user-specific CBR of the unlicensed channel,we propose a flexible scheduling scheme for UL MU-MIMO in unlicensed spectrum,and formulate an optimization problem for the optimal scheduled user number.Furthermore,an adaptive scheduling algorithm is proposed to decide the optimal number of the scheduled users efficiently.The simulation results show that,based on statistical channel condition in unlicensed spectrum,adjusting the number of the scheduled user flexibly can offset the degraded throughput and form an optimal MU-MIMO transmission.

关键词： 5G unlicensed spectrum MU-MIMO uplink scheduling

Weight Based Channel Selection Towards 5G in the Unlicensed Spectrum

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China Communications 2018年第8期15卷 54-66页

作者： Yu Zeng Ting Zhou honglin hu Yang Yang Jinfeng Tian Zhenhong Li Shanghai Institute of Microsystem and Information Technology(SIMIT) Chinese Academy of SciencesNo.865 Changning RoadChangning DistrictShanghai 200050China University of Chinese Academy of Sciences No.19A Yuquan RoadShijingshan DistrictBeijing 100049China Shanghai Advanced Research Institute(SARI) Chinese Academy of SciencesNo.99 Haike RoadPudong DistrictShanghai 201210China ShanghaiTech University Shanghai 201210China TCL Communication Technology Holdings Ltd.Shanghai R&D Center Building C5-9FNo.232Liangjing RoadZhangjiang H igh-tech ParkShanghai 201203China

The growth of the wireless and mobile communication data traffic has brought severe challenges to the present telecommunication systems. To meet the ever-increasing mobile traffic demand in the next 5 th generation(5 G) communication systems, deploying 5 G in the unlicensed spectrum(5 G-U), has been regarded as a promising technology. The Third Generation Partnership Project(3 GPP) has specified the standardization of the Licensed Assisted Access(LAA) and its extension enhanced LAA(e LAA), to opportunistically transmit in the unlicensed spectrum. The LAA/e LAA systems share unlicensed spectrum resource with other networks, e.g., the Wi-Fi systems. In this article, we analyze the coexistence between the e LAA and the Wi-Fi systems in the unlicensed spectrum. We firstly establish the system model where the e LAA coexists with the Wi-Fi systems. Then, we theoretically derive and figure out the unfairness in the multi-channel occupancy rate between the e LAA and the Wi-Fi systems. After that, we propose a weight based channel selection method to improve the fairness of the coexistence. The numerical results demonstrate that by avoiding contentions and declining collisions, our method not only enhances the fairness, but also improves the overall unlicensed spectrum usage rate.

关键词：光谱分析重量隧道 Wi-Fi 通讯系统通讯数据标准化共存

Ultra wear resistant TiC-Fe coating prepared by high efficient and economic plasma cladding method

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China Welding 2024年第1期33卷 20-26页

作者：黄大牛仝永刚华熳煜牟泓霖柳建蔡志海胡永乐 College of Automotive and Mechanical Engineering Changsha University of Science and TechnologyChangsha 410114China National Engineering Research Center for Mechanical Product Remanufacturing Army Academy of Armored ForcesBeijing 100072China

The key components of engineering machinery frequently failed due to working in the high load and high wear operating envir-onment.And the performance of the Fe-based alloy coatings typically employed need to be improved for fulfilling the service requirements.Herein,a TiC strengthened Fe-based alloy cladding layer,named TiC-Fe coating,was designed and prepared by plasma cladding technology.The frictional wear performance of coating under various loads was tested.The wear morphology of the coating was observed,and its wear mechanism was examined.The results indicated that the TiC-Fe coating was well formed and metallurgically bonded to the Q345C substrate.Its microstructure mainly consisted of Fe-Cr solid solution,α-Fe phase,(Fe,Cr)_(7)C_(3) phase and TiC phase.The coating exhibited an average microhardness of 980 HV0.2,which was about 5.4 times that of the Q345C substrate.The wear mass loss of the TiC-Fe coatings was much smaller than that of the Q345C substrate,which indicated that the wear resistance of the Q345C coating was superior to the substrate,and the wear mechanism of the coating was mainly attributed to the abrasive wear.

关键词： plasma cladding TiC microstructure wear resistance