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Joint hybrid beamforming and power splitting design in millimeter-wave simultaneous wireless information and power transfer system

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The Journal of China Universities of Posts and Telecommunications 2019年第2期26卷 59-66页

作者： Bao Tiantian Wen Xiangming Lu Zhaoming Chen yawen Zheng Wei School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China Beijing Laboratory of Advanced Information Networks Beijing University of Posts and TelecommunicationsBeijing 100876China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and TelecommunicationsBeijing 100876China

A joint hybrid beamforming and power splitting(JHBPS) design problem for simultaneous wireless information and power transfer(SWIPT) in millimeter-wave(mmWave) system is *** considered scenario is a multi-antenna base station(BS) transfers information and energy simultaneously to multiple single-antenna *** adopts hybrid digital and analog beamforming architecture to reduce hardware *** separate acquired signals with power splitters either for information decoding(ID) or energy harvesting(EH).The aim is minimizing total transmission power by joint design of hybrid beamforming and PS under ID and EH *** is difficult to obtain the optimal hybrid beamformer directly since the analog beamformer and digital beamformer are ***,a two-stage algorithm is proposed to solve the *** the first stage,the optimal beamformer and PS ratios are obtained by solving the joint transmission beamforming and PS design *** the second stage,the optimal beamformer is approximated with the product of analog beamformer and digital *** superiority of proposed algorithm over the existing algorithms is demonstrated through ***,the effectiveness of approximation algorithm is testified.

关键词： SWIPT mmWave hybrid analog and digital beamforming

An Analysis of Life-Year Lost Due to COVID-19--34 Countries, December 2019-March 2021

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China CDC weekly 2022年第23期4卷 494-498,I0004-I0008页

作者： Shan Jiang Dan Cai Daqin Chen yawen Jiang School of Population and Public Health University of British ColumbiaVancouverBCCanada School of Public Health(Shenzhen) Sun Yat-sen UniversityShenzhen CityGuangdong ProvinceChina

Summary What is already known about this topic?The coronavirus disease 2019(COVID-19)pandemic has caused severe health *** most COVID-19 deaths occurred among very old people,their life-year loss might be very large b... 详细信息

关键词： consequences COV deaths

Trimetallic Au@PdPb nanowires for oxygen reduction reaction

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Nano Research 2020年第10期13卷 2691-2696页

作者： Xian Jiang Yuexin Xiong Ruopeng Zhao Jiancheng Zhou Jong-Min Lee yawen Tang School of Chemistry and Chemical Engineering Southeast University Nanjing 11189China Schoo of Chemical and Biomedical Engineering Nanyang Technological University Singapore 637459Singapore jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China

The development of highly efficient and stable Pd-based catalysts is crucial to improve their sluggish oxygen reduction reaction(ORR)kinetics in acid *** improve ORR activity and utilization efficiency of Pd,an ideal catalyst should have ORR-favorable chemical environment,optimized geometric structure,and long periods of *** this work,we first synthesize a novel trimetallic Au@PdPb core–shell catalyst consisting of PdPb alloy nano-layers grown on the surface of ultrathin Au nanowires(NWs)by a two-step water-bath *** Au@PdPb NWs have the merits of anisotropic one-dimensional nanostructure,high utilization efficiency of Pd atoms and doping of Pb *** of the structural and multiple compositional advantages,Au@PdPb NWs exhibit remarkably enhanced ORR activity with a high haIf-wave potential(0.827 V),much better than those of commercial Pd black(0.788 V)and bimetallic Au@Pd NWs(0.803 V).Moreover,Au@PdPb NWs display better electrocatalytic stability for the ORR than those of Pd black and Au@Pd *** study demonstrates the validity of our approach for deriving highly ORR-active Pd-based catalysts by modifying their structure and composition.

关键词： trimetallic Au@PdPb nanowires core–shell structure optimized electronic structure electrocatalyst oxygen reduction reaction

From beasts to bytes:Revolutionizing zoological research with artificial intelligence

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Zoological Research 2023年第6期44卷 1115-1131页

作者： Yu-Juan Zhang Zeyu Luo yawen Sun Junhao Liu Zongqing Chen Chongqing Key Laboratory of Vector Insects Chongqing Key Laboratory of Animal BiologyCollege of Life ScienceChongqing Normal UniversityChongqing 401331China School of Mathematical Sciences Chongqing Normal UniversityChongqing 401331China Chongqing National Center for Applied Mathematics Chongqing Normal UniversityChongqing 401331China

Since the late 2010s,Artificial Intelligence(AI)including machine learning,boosted through deep learning,has boomed as a vital tool to leverage computer vision,natural language processing and speech recognition in revolutionizing zoological *** review provides an overview of the primary tasks,core models,datasets,and applications of AI in zoological research,including animal classification,resource conservation,behavior,development,genetics and evolution,breeding and health,disease models,and ***,we explore the challenges and future directions of integrating AI into this *** on numerous case studies,this review outlines various avenues for incorporating AI into zoological research and underscores its potential to enhance our understanding of the intricate relationships that exist within the animal *** we build a bridge between beast and byte realms,this review serves as a resource for envisioning novel AI applications in zoological research that have not yet been explored.

关键词： Animal science Data extraction Classification model Behavior analysis Biomolecular sequences analysis

A member of the ALOG gene family has a novel role in regulating nodulation in Lotus japonicus

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Journal of Integrative Plant Biology 2019年第4期61卷 463-477页

作者： yawen Lei Shihao Su Liang He Xiaohe Hu Da Luo State Key Laboratory of Biocontrol and Guangdong Key Laboratory of Plant Resources School of Life Sciences Sun Yat-sen University Institute of Transformative Bio-Molecules (WPI-ITbM) Nagoya University

Legumes can control the number of symbiotic nodules that form on their roots, thus balancing nitrogen assimilation and energy consumption. Two major pathways participate in nodulation: the Nod factor(NF)signaling pathway which involves recognition of rhizobial bacteria by root cells and promotion of nodulation, and the autoregulation of nodulation(AON) pathway which involves long-distance negative feedback between roots and shoots. Although a handful of genes have a clear role in the maintenance of nodule number, additional unknown factors may also be involved in this process. Here, we identify a novel function for a Lotus japonicus ALOG(Arabidopsis LSH1 and Oryza G1) family member, LjALOG1,involved in positively regulating nodulation. LjALOG1 expression increased substantially after inoculation with rhizobia, with high levels of expression in whole nodule primordia and in the base of developing nodules. The ljalog1 mutants, which have an insertion of the LORE1 retroelement in LjALOG1, had significantly fewer nodules compared with wild type, along with increased expression of LjCLE-RS1(L. japonicus CLE Root Signal 1), which encodes a nodulation suppressor in the AON pathway. In summary,our findings identified a novel factor that participates in controlling nodulation, possibly by suppressing the AON pathway.

关键词： ALOG gene novel role Lotus

HYDROGEN ABSORPTION OF FeTi+x wt-% La ALLOYS WITH ALTERNATE LAYER STRUCTURE

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Acta Metallurgica Sinica(English Letters) 1992年第5期5卷 354-357页

作者： QIAN Jiuxin ZHANG yawen CHEN Xudong Peking University,Beijing,China Peking Univ Beijing China

Superior hydrogen absorbability of the alloys fo FeTi-La with alternate layer structure was found *** would be available at 30℃ under 6 MPaH_2 without any prior treatment.

关键词： FeTi La hydrogen absorption

Playing chess with the devil

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Playing chess with the devil

Aggregation-induced emission and self-assembly of functional tetraphenylethene-based tetracationic dicyclophanes for selective detection of ATP in water

作者： Zhang yawen

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Chinese Chemical Letters 2021年第11期32卷 3531-3534页

作者： Chunyan Qin yawen Li Qingfang Li Chaochao Yan Liping Cao College of Chemistry and Materials Science Northwest UniversityXi'an 710069China

Functional dicyclophanes with various substituents(e.g.,NO_(2),Br,OCH_(3)and OH)were synthesized via one-pot S_(N)2 *** can form nanospheres via the head-to-tail self-assembly between the cavities and the TPE units to exhibit aggregation-induced emission(AIE)in aqueous *** AIE-active nanospheres with cationic feature exhibited selective recognition with fluorescence response for anionic ATP via electrostatic interactions and hydrophobic effects in water.

关键词： Aggregation-induced emission Dicyclophanes Tetraphenylethene Adenosine derivatives Fluorescence

Plasma-induced Mo-doped Co_(3)O_(4)with enriched oxygen vacancies for electrocatalytic oxygen evolution in water splitting

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Carbon Energy 2023年第3期5卷 98-111页

作者： Yujie Huang Meng Li Fei Pan Zhuoya Zhu Huamei Sun yawen Tang Gengtao Fu Jiangsu Key Laboratory of New Power Batteries School of Chemistry and Materials ScienceJiangsu Collaborative Innovation Centre of Biomedical Functional MaterialsNanjing Normal UniversityNanjingChina School of Chemistry and Chemical Engineering Southeast UniversityNanjingChina

Heteroatomic substitution and vacancy engineering of spinel oxides can theoretically optimize the oxygen evolution reaction(OER)through charge redistribution and d-band center modification but still remain a great challenge in both the preparation and catalytic ***,we proposed a novel and efficient Ar-plasma(P)-assisted strategy to construct heteroatom Mo-substituted and oxygen vacancies enriched hierarchical spinel Co_(3)O_(4)porous nanoneedle arrays in situ grown on carbon cloth(denoted P-Mo-Co_(3)O_(4)@CC)to improve the OER ***-plasma technology can efficiently generate vacancy sites at the surface of hydroxide,which induces the anchoring of Mo anion salts through electrostatic interaction,finally facilitating the substitution of Mo atoms and the formation of oxygen vacancies on the Co_(3)O_(4)*** P-Mo-Co_(3)O_(4)@CC affords a low overpotential of only 276 mV at 10 mA cm^(−2)for the OER,which is 58 mV superior to that of Mo-free Co_(3)O_(4)@CC and surpasses commercial RuO_(2)*** robust stability and satisfactory selectivity(nearly 100%Faradic efficiency)of P-Mo-Co_(3)O_(4)@CC for the OER are also ***-cal studies demonstrate that Mo with variable valance states can efficiently regulates the atomic ratio of Co^(3+)/Co^(2+)and increases the number of oxygen vacancies,thereby inducing charge redistribution and tuning the d-band center of Co_(3)O_(4),which improve the adsorption energy of oxygen intermediates(e.g.,*OOH)on P-Mo-Co_(3)O_(4)@CC during ***,the two-electrode OER//HER electrolyzer equipped with P-Mo-Co_(3)O_(4)@CC as anode displays a low operation potential of 1.54 V to deliver a current density of 10 mA cm^(−2),and also exhibits good reversibility and anticurrent fluctuation ability under simulated real energy supply conditions,demonstrating the great potential of P-Mo-Co_(3)O_(4)@CC in water electrolysis.

关键词： charge redistribution Mo‐Co_(3)O_(4) nanoneedle arrays oxygen evolution reaction oxygen vacancy water electrolysis