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Transmit Power Minimization for IRS-Assisted NOMA-UAV Networks

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China Communications 2024年第5期21卷 137-152页

作者： Zhao Chen Pang Xiaowei tang jie Liu Mingqian Zhao Nan Zhang Xiuyin Wang Xianbin School of Information and Communication Engineering Dalian University of TechnologyDalian 116024China School of Electronic and Information Engineering South China University of TechnologyGuangzhou 510641China State Key Laboratory of Integrated Services Networks Xidian UniversityXi’an 710071China Department of Electrical and Computer Engineering Western UniversityLondonON N6A 5B9Canada

The flexibility of unmanned aerial vehicles(UAVs)allows them to be quickly deployed to support ground *** reflecting surface(IRS)can reflect the incident signal and form passive beamforming to enhance the signal in the specific *** by the promising benefits of both technologies,we consider a new scenario in this paper where a UAV uses non-orthogonal multiple access to serve multiple users with *** to their distance to the UAV,the users are divided into the close users and remote *** UAV hovers above the close users due to their higher rate requirement,while the IRS is deployed near the remote users to enhance their received *** aim at minimizing the transmit power of UAV by jointly optimizing the beamforming of UAV and the phase shift of IRS while ensuring the decoding ***,the problem is ***,we decompose it into two sub-problems,including the transmit beamforming optimization and phase shift optimization,which are transformed into second-order cone programming and semidefinite programming,*** propose an iterative algorithm to solve the two sub-problems *** results prove the effectiveness of the proposed scheme in minimizing the transmit power of UAV.

关键词： intelligent reflecting surface nonorthogonal multiple access phase shift optimization transmit beamforming optimization unmanned aerial vehicle

Facet-dependent transformation and toxicity of nanoscale zinc oxide in the synthetic saliva

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Journal of Environmental Sciences 2024年第5期139卷 170-181页

作者： Xiang Zhang Yunpeng Huang Jikun Wang jie tang YangMei Nali Zhu Zhigang Li Lingxiangyu Li YaweiWang School of Environment Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Key Laboratory of Systems Health Science of Zhejiang Province Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China Department of Chemistry University of PennsylvaniaPhiladelphia 19104USA

The nanoscale zinc oxide(n-ZnO)was used in food packages due to its superior antibac terial activity,resulting in potential intake of n-ZnO through the digestive system,wherein n-ZnO interacted with *** recent,facet engineering,a technique for controlling the exposed facets,was applied to n-ZnO,whereas risk of n-ZnO with specific exposed facets in saliva was *** nanoflakes(ZnO-0001)and nanoneedles(ZnO-1010)with the pri mary exposed facets of{0001}and{1010}respectively were prepared in this study,investigat ing stability and toxicity of ZnO-0001 and ZnO-1010 in synthetic *** ZnO-0001 and ZnO-1010 partially transformed into amorphous Zn_(3)(PO_(4))_(2)within 1 hr in the saliva even containing orgnaic components,forming a ZnO-Zn_(3)(PO_(4))_(2)core-shell *** less,ZnO-1010 relative to ZnO-0001 would likely transform into Zn_(3)(PO_(4))_(2),being attributed to superior dissolution of{1010}facet due to its lower vacancy formation energy(1.15 eV than{0001}facet(3.90 eV)).The toxicity of n-ZnO to Caco-2 cells was also dependent on the primary exposed facet;ZnO-0001 caused cell toxicity through oxidative stress,whereas ZnO-1010 resulted in lower cells viability than ZnO-0001 through oxidative stress and mem brane *** functional theory calculations illustrated that·O_(2)^(-)was formed and released on{1010}facet,yet O_(2)^(2-)instead of·O_(2)^(-)was generated on{0001}facet,leading to low oxidative stress from *** findings demonstrated that stability and toxicity of n-ZnO were dependent on the primary exposed facet,improving our understanding o health risk of nanomaterials.

关键词： The exposed facet Nanoscale ZnO Chemical transformation Synthetic salica Nanotoxicity

Dynamic analysis of a novel multilink-spring mechanism for vibration isolation and energy harvesting

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Chinese Physics B 2024年第5期33卷 366-379页

作者：谢佳衡杨涛唐介 Research & Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China Department of Engineering Mechanics Northwest Polytechnical UniversityXi'an 710072China Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and AerospaceSouthwest Jiaotong UniversityChengdu 610031China

Due to technical limitations,existing vibration isolation and energy harvesting(VIEH)devices have poor performance at low *** paper proposes a new multilink-spring mechanism(MLSM)that can be used to solve this *** VIEH performance of the MLSM under harmonic excitation and Gaussian white noise was *** was found that the MLSM has good vibration isolation performance for low-frequency isolation and the frequency band can be widened by adjusting parameters to achieve a higher energy harvesting *** comparison with two special cases,the results show that the MLSM is basically the same as the other two oscillators in terms of vibration isolation but has better energy harvesting performance under multistable *** MLSM is expected to reduce the impact of vibration on high-precision sensitive equipment in some special sites such as subways and mines,and at the same time supply power to structural health monitoring devices.

关键词： multilink-spring mechanism nonlinear dynamics vibration isolation energy harvester

Revealing the formation mechanism of umami peptides in fermented broad bean paste based on peptidomics and macrogenomics

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Food Science and Human Wellness 2024年

作者： Yuqing Xie Jianhua Zhao Binbin Zhou Ping Liu jie Zhao Min Xu Jiaxin Chen Hongbin Lin jie tang School of Food and Bio-engineering， Xihua University Chongqing Key Laboratory of Specialty Food Co-Built by Sichuan and Chongqing Chengdu Food Microbiology Key Laboratory of Sichuan Province

Umami peptides play important roles in the flavor of fermented broad bean paste (FBBP)， and proteases produced by microorganisms contributed to the production of umami peptides. In order to reveal the formation of umami peptides and their relationships with protease-producing microorganisms during the natural fermentation of FBBP， peptidomics and virtual screening were used to identify and screen umami peptides. Meanwhile， macrogenomics was used to analyze the abundance of microbial-derived protease genes during FBBP fermentation. Then， based on the Pearson correlation coefficient， the correlation network diagram of each protease-producing microorganism with umami peptides was constructed. The results showed that a total of two exopeptidases and four endopeptidases were annotated from FBBP. Staphylococcus， Lactobacillus， Aspergillus， and Weissella can produce most proteases. The species Lactobacillus＿curvatus， Dyella＿jiangningensis， Erythrobacter＿sp， and unclassified＿g＿Pantoea had strong correlation with umami peptides， and they may contribute to the process of protein hydrolysis to produce umami peptides. This study is expected to reveal the formation mechanism of umami peptides in FBBP， and the results of this study provided a better understanding of the relationship between proteases， microbiota， and core umami peptides in FBBP， which could help to improve the umami taste of Pixian Douban paste (PDBP) during fermentation.

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Design,synthesis,and biological evaluation of 1,2,4-triazole derivatives as potent antitubercular agents

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Chinese Chemical Letters 2024年第3期35卷 326-331页

作者： Yu Wen Shichun Lun Yuxue Jiao Wei Zhang Tianyu Hu Ting Liu Fan Yang jie tang Bing Zhang William R.Bishai Li-Fang Yu Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China Center for Tuberculosis Research Department of MedicineDivision of Infectious DiseaseJohns Hopkins School of MedicineBaltimoreMD21231-1044United States Shanghai Institute for Advanced Immunochemical Studies and School of Life Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Key Laboratory of Green Chemistry and Chemical Process School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China

Inhibition of mycobacterial membrane protein large 3(MmpL3)thereby affecting the mycolic acid biosynthetic pathway has been proven to be an effective strategy for developing antitubercular *** on the X-ray crystal structure of MmpL3 inhibitor complexes,a series of novel 1,2,4-triazole derivatives were designed,synthesized and evaluated antitubercular activity against Mtb strain *** structure–activity relationship exploration resulted in the identification of compounds 21 and 28,which possess potent antitubercular activity against Mtb strain H37Rv[minimum inhibitory concentration(MIC)=0.03–0.13μg/mL]and the clinical isolates of multidrug resistance(MDR)and extensive drug resistance(XDR)tuberculosis(MIC=0.06–1.0μg/mL).Moreover,compounds 21 and 28 showed neglectable cytotoxicity(IC_(50)≥32μg/mL)to the mammalian Vero cells and favorable physicochemical and pharmacokinetic properties according to the in silico absorption,distribution,metabolism and excretion(ADME)***,the potential target of representative 1,2,4-triazole 28 was identified to be MmpL3 using a microscale thermophoresis(MST)assay.

关键词： Tuberculosis MDR and XDR-TB MmpL3 inhibitor 1 2 4-Triazole Structure-based drug design

HF-VHF NEMS resonators enabled by 2D semiconductor ReSe2

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Science China(Information Sciences) 2024年第10期67卷 393-394页

作者： jie tang Ziluo SU Shuang CAI Yalan WANG Luming WANG Jiaqi WU Jiaze QIN Jiankai ZHU Bo XU Juan XIA Zenghui WANG Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China

Two-dimensional（2D） semiconductors offer a plethora of new opportunities for constructing novel *** them, rhenium diselenide(ReSe2, crystal structure in Figure 1（a）) stands out due to its unique interlayer couplin...

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类星体3C 446射电光变非线性特性分析

天文学报 2024年第2期65卷 132-142页

作者：唐洁陕西理工大学物理与电信工程学院汉中723000

类星体有剧烈、大幅度的光变现象,光变研究有助于建立与观测相符的理论模型.这篇文章从密歇根大学射电天文台数据库收集了类星体3C 446射电4.8、8.0和14.5GHz波段的长期观测数据.传统的线性方法难以分析复杂的光变现象,文章采用了集合... 详细信息

类星体有剧烈、大幅度的光变现象,光变研究有助于建立与观测相符的理论模型.这篇文章从密歇根大学射电天文台数据库收集了类星体3C 446射电4.8、8.0和14.5GHz波段的长期观测数据.传统的线性方法难以分析复杂的光变现象,文章采用了集合经验模态分解(Ensemble Empirical Mode Decomposition,EEMD)方法和非线性分析方法相结合,从混沌动力学特性、分形特性和周期性多角度对类星体光变随时间演化的规律进行了较全面的分析,并重点对比分析了除去周期成分或混沌成分前后,光变的周期性和非线性特性是否存在明显区别.分析结果表明,类星体3C 446射电波段光变资料由周期成分、趋势成分和混沌成分组成,光变具有周期性、混沌性和分形特性.除去混沌成分和趋势成分后的光变周期与原始光变资料的周期完全相同,而两者的混沌和分形特性有明显不同.从饱和关联维数来看,重构动力学系统时,除去周期成分和趋势成分后的光变资料比原始光变资料需要更多的独立参量,Kolmogorov熵值表明前者信息的损失率比后者大,系统的混沌程度更高,系统也更复杂,Hurst值表明后者自相似性和长程相关性比前者略强.

关键词：星系:活动类星体:个别:3C 446 方法:数据分析

An amorphous FeMoO_(4) nanorod array enabled high-efficiency oxygen evolution electrocatalysis in alkaline seawater

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Nano Research 2024年第4期17卷 2270-2275页

作者： jie tang Shengjun Sun Xun He Hui Zhang Chaoxin Yang Min Zhang Meng Yue Hefeng Wang Yuntong Sun Yonglan Luo Sulaiman Alfaifi Asmaa Farouk Mohamed S.Hamdy Xuping Sun Huiqing Wang Binwu Ying Department of Laboratory Medicine West China HospitalSichuan UniversityChengdu 610041China College of Chemistry Chemical Engineering and Materials ScienceShandong Normal UniversityJinan 250014China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Chemistry Department Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Department of Chemistry College of ScienceKing Khalid UniversityAbha 61413Saudi Arabia Medical Simulation Centre West China Second University HospitalSichuan UniversityChengdu 610041China

The development of highly efficient and durable oxygen evolution reaction(OER)catalysts for seawater electrolysis is of great importance for ***,an amorphous FeMoO_(4) nanorod array on Ni foam is reported as a highly active OER electrocatalyst in alkaline seawater,requiring only overpotentials of 303 and 332 mV to achieve 100 and 300 mA·cm^(-2),***,it shows strong long-term electrochemical durability for at least 50 h.

关键词： amorphous material FeMoO_(4) nanorod array electrocatalyst seawater electrolysis oxygen evolution reaction

Tropical cyclone activities in the Western North Paci fi c in 2022

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TROPICAL CYCLONE RESEARCH AND REVIEW 2024年第2期13卷 125-135页

作者： Huang, Xin Bai, Lina Yu, Zifeng Chan, Johnny C. L. Yu, Hui tang, jie Guo, Rong Wan, Rijin China Meteorol Adm Shanghai Typhoon Inst Shanghai 200030 Peoples R China Asia Pacific Typhoon Collaborat Res Ctr Shanghai Peoples R China City Univ Hong Kong Sch Energy & Environm Hong Kong Peoples R China

Based on the best-track dataset from the Shanghai Typhoon Institute/China Meteorological Administration, the paper provides a comprehensive summary and analysis of tropical cyclone (TC) activities in the Western North Pacific (WNP) and the South China Sea (SCS) for 2022. Using the historical climatology from 1951 to 2020, the anomalous conditions during 2022 in TC frequency, origin locations, tracks, intensity, and duration for the entire ocean basin as well as landfall events in China are examined. Results show that the overall TC frequency is slightly lower than normal, but the multiple TC events have a very high frequency of occurrence. Origin locations of TCs, which mark the starting points of their paths, show a large westward and northward deviation from climatology. Around 40% of the named TCs exhibit a shift in their direction of movement from westerly to easterly. Additionally, comparisons of the means, medians, upper and lower quartiles all indicate that the intensity of TCs in 2022 is generally lower than the climatology, with the duration of TCs at tropical storm intensity or above being shorter than usual. A notable observation is the fewer incidence of TC landfalls in China, but with a geographical concentration in Guangdong Province. These anomalous annual TC activities are influenced by related atmospheric and oceanic environmental conditions modulated by multi-scale climate variability. The findings provide useful information for enhancing disaster mitigation strategies in the Asia-Pacific region. (c) 2024 The Shanghai Typhoon Institute of China Meteorological Administration. Publishing services by Elsevier B.V. on behalf of KeAi Communication Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： Tropical cyclone Western North Paci fi c Anomalous characteristics Annual report TYPHOON COMMITTEE REGION EL-NINO INTERANNUAL VARIABILITY INTERDECADAL VARIATIONS GENESIS FREQUENCY 3RD ASSESSMENT CLIMATE-CHANGE ENSO OSCILLATION INTENSITY