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Evaluating the accuracy of earth rotation parameters based on the BDS observations

Geodesy and Geodynamics 2025年第1期16卷 87-98页

作者： Chenxiang Wang Pengfei Zhang Tengxu Zhang Ziyu Shen Jizhang Sang Wenbin Shen School of Geodesy and Geomatics Wuhan University Time and Frequency Geodesy center Wuhan University School of Resource Environmental Science and Engineering Hubei University of Science and Technology

The Bei Dou satellite system(BDS) has progressed with the full operationalization of the secondgeneration regional system(BDS-2) and the third-generation global system(BDS-3). This technology plays a crucial role in determining Earth Rotation Parameters(ERPs). In this study, we determine the ERPs based on the observations of BDS-2, BDS-3 and BDS-2+BDS-3, with the time spanning from August18, 2022, to August 18, 2023. The IERS EOP 20C04 series is used as a reference to evaluate the accuracy of the ERP estimates. We analyze the impact of different numbers of reference stations, polyhedron volumes, observation arc lengths, satellite types, and satellite systems on solving ERPs using BDS-2 and BDS-3 observation data provided by the International GNSS Service(IGS) stations. When selecting a specific satellite type, it is necessary to choose an appropriate observation arc length based on different numbers of reference stations while maximizing the volume of the formed polyhedron to achieve optimal efficiency and accuracy in parameter estimation. When both the number of reference stations and observation arc length are fixed, higher precision of the ERPs can be achieved using observations from MEO than MEO + IGSO and MEO + IGSO + GEO. Moreover, when considering only IGSO and MEO satellites as options for analysis purposes, BDS-3 provides higher accuracy compared to BDS-2. In summary, when using BDS for ERP estimation and MEO satellite observations with the same observation arc length,selecting stations from reference stations with larger polyhedral volumes can significantly improve the efficiency and accuracy of parameter estimation.

关键词： Earth rotation parameters Polyhedron volume Observation arc length BDS-2 BDS-3

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Data driven prediction of fragment velocity distribution under explosive loading conditions

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Defence technology(防务技术) 2025年第1期43卷 109-119页

作者： Donghwan Noh Piemaan Fazily Songwon Seo Jaekun Lee Seungjae Seo Hoon Huh Jeong Whan Yoon Department of Mechanical engineering Korea Advanced Institute of Science and Technology291 Daehak-roYuseong-guDaejeon 34141Republic of Korea Warhead system Team Precision Firepower Research DivisionPOONGSAN Defense R&D Institute2606-10 Hoguk-roAngang-OupKyung JuKyung-BukRepublic of Korea School of engineering Deakin UniversityWauran PondsVIC 3216Australia

This study presents a machine learning-based method for predicting fragment velocity distribution in warhead fragmentation under explosive loading *** fragment resultant velocities are correlated with key design parameters including casing dimensions and detonation *** paper details the finite element analysis for fragmentation,the characterizations of the dynamic hardening and fracture models,the generation of comprehensive datasets,and the training of the ANN *** results show the influence of casing dimensions on fragment velocity distributions,with the tendencies indicating increased resultant velocity with reduced thickness,increased length and *** model's predictive capability is demonstrated through the accurate predictions for both training and testing datasets,showing its potential for the real-time prediction of fragmentation performance.

关键词： Data driven prediction Dynamic fracture model Dynamic hardening model Fragmentation Fragment velocity distribution High strain rate Machine learning

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Synergistically S/N self-doped biochar as a green bifunctional cathode catalyst in electrochemical degradation of organic pollutant

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Green Energy & Environment 2025年第1期10卷 214-230页

作者： Xuechun Wang Huizhong Wu Jiana Jing Ge Song Xuyang Zhang Minghua Zhou Raf Dewil Key Laboratory of Pollution Process and Environmental Criteria Ministry of EducationCollege of Environmental Science and EngineeringNankai UniversityTianjin300350China Tianjin Key Laboratory of Environmental technology for Complex Trans-Media Pollution Nankai UniversityTianjin300350China Tianjin Advanced Water Treatment technology International Joint research center College of Environmental Science and EngineeringNankai UniversityTianjin300350China Department of Chemical engineering KU LeuvenJ.De Nayerlaan 5Sint-Katelijne-Waver B2860Belgium

Biomass-derived heteroatom self-doped cathode catalysts has attracted considerable interest for electrochemical advanced oxidation processes(EAOPs)due to its high performance and sustainable ***,we illustrated the morphological fates of waste leaf-derived graphitic carbon(WLGC)produced from waste ginkgo leaves via pyrolysis temperature regulation and used as bifunctional cathode catalyst for simultaneous H_(2)O_(2) electrochemical generation and organic pollutant degradation,discovering S/N-self-doping shown to facilitate a synergistic effect on reactive oxygen species(ROS)*** the optimum temperature of 800℃,the WLGC exhibited a H_(2)O_(2) selectivity of 94.2%and tetracycline removal of 99.3%within 60 *** functional theory calculations and in-situ Fourier transformed infrared spectroscopy verified that graphitic N was the critical site for H_(2)O_(2) *** pyridinic N and thiophene S were the main active sites responsible for OH generation,N vacancies were the active sites to produce ^(1)O_(2) from O_(2).The performance of the novel cathode for tetracycline degradation remains well under a wide pH range(3–11),maintaining excellent stability in 10 *** is also industrially applicable,achieving satisfactory performance treating in real water *** system facilitates both radical and non-radical degradation,offering valuable advances in the preparation of cost-effective and sustainable electrocatalysts and hold strong potentials in metal-free EAOPs for organic pollutant degradation.

关键词： Biochar S and N self-doping H_(2)O_(2)production In-situ FTIR Metal-free electrochemical advanced oxidation processes

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UAV-Mounted Intelligent Reflecting Surface in Maritime Wireless Powered Communication Network

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China Communications 2025年第03期 254-269页

作者： Liu Yuan Han Fengxia Zhao Shengjie School of Information Science and Electrical engineering Shandong Jiaotong University College of Electronic and Information engineering Tongji University School of Software engineering Tongji University engineering research center of Key Software Technologies for Smart City Perception and Planning Ministry of Education Key Laboratory of Embedded system and Service Computing Tongji University

Intelligent reflecting surface(IRS) assisted with the wireless powered communication network(WPCN) can enhance the desired signal energy and carry out the power-sustaining problem in ocean monitoring systems. In this paper, we investigate a reliable communication structure where multiple buoys transmit data to a base station(BS) with the help of the unmanned aerial vehicle(UAV)-mounted IRS and harvest energy from the base station simultaneously. To organically combine WPCN with maritime data collection scenario, a scheduling protocol that employs the time division multiple access(TDMA) is proposed to serve multiple buoys for uplink data ***, we compare the full-duplex(FD) and half-duplex(HD) mechanisms in the maritime data collection system to illustrate different performances under these two modes. To maximize the fair energy efficiency under the energy harvesting constraints, a joint optimization problem on user association, BS transmit power, UAV's trajectory and IRS's phase shift is formulated. To solve the non-convex problem, the original problem is decoupled into several subproblems, and successive convex optimization and block coordinate descent(BCD) methods are employed obtain the near-optimal solutions alternatively. Simulation results demonstrate that the UAV-mounted IRS can significantly improve energy efficiency in our considered system.

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Efficient activation of peroxymonosulfate for catalytic degradation of organic pollutants by simultaneously using low-level cobalt ions and calcium carbonate micro-particles

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Journal of Environmental Sciences 2025年第5期151卷 113-124页

作者： Yu Zhou Xiaobo Wang Nan Wang Shuangshuang Huang Lihua Zhu College of Chemistry and Chemical engineering Huazhong University of Science and TechnologyWuhan 430074China College of Chemistry and Chemical engineering Hubei Polytechnic UniversityHuangshi 435003China College of Chemistry and Environmental engineering Wuhan Polytechnic UniversityWuhan 430023China School of Physics and technology Center for Electron MicroscopyWuhan UniversityWuhan 430072China

An efficient catalytic system was developed to remove various organic pollutants by simultaneously using low-level cobalt ions,calcium carbonate micro-particles and peroxymonosulfate(PMS).A simple base-induced precipitation was used to successfully loaded Co-centered reactive sites onto the surface of CaCO_(3)*** optimal conditions at 25°C,10 mg/L methylene blue(MB)could be completely degraded within 10 min with 480μg/L Co^(2+),0.4 g/L CaCO_(3)microparticles(or 0.4 g/L Co@CaCO_(3))and 0.1 g/L *** MB degradation followed the pseudo first order kinetics with a rate constant of 0.583 min^(−1),being 8.3,11.5 and 53.0 times that by using Co-OH(0.07 min^(−1)),Co^(2+)(0.044 min^(−1))and CaCO_(3)(0.011 min^(−1))as the catalyst,*** was confirmed that there was a synergistic effect in the catalytic activity between Co species and the CaCO_(3)particles but the major contributor was the highly dispersed Co *** Co^(2+)-containing simulated electroplating wastewater was used as the Co^(2+)source,not only the added MB was also completely degraded within 5 min in this catalytic system,but also the coexisting heavy metal ions were substantially *** presently developed method was applied to simultaneously treat organic wastewater and heavy metals *** present method was also successfully used to efficiently degrade other organic pollutants including bisphenol A,sulfamethoxazole,rhodamine B,tetrabromobisphenol A,ofloxacin and benzoic acid.A catalytic mechanism was proposed for the PMS activation by Co@CaCO_(3).The surface of CaCO_(3)particles favors the adsorption of Co^(2+).More importantly,the surface of CaCO_(3)particles provides plentiful surface-OH and-CO_(3)^(2+),and these surface groups complex with Co^(2+)to producemore catalytically active species such as surface[CoOH]^(−),resulting in rapid Co^(2+)/Co^(3+)cycling and electron *** interactions cause the observed synergistic effect between Co species and Ca

关键词： CaCO3 Low-level cobalt Peroxymonosulfate Oxidative degradation

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Fine regulation of charge recombination for multi-color persistent luminescence

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Science China Chemistry 2025年

作者： Ping Jiang Bingbing Ding Tao Li Chao Wang Ziyi Wang Wenbin Liu Xiang Ma Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint research center Frontiers Science Center for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai Key Laboratory of Crime Scene Evidence Shanghai Research Institute of Criminal Science and Technology

Pure organic room-temperature phosphorescence（RTP） has drawn broad attention due to its long persistent luminescence and large Stokes shift. Although the doping strategy has become one of the most effective methods to construct organic RTP systems,there is still some fuzziness of impurities, mechanisms and luminescence regulation. This study develops a series of doping RTP systems based on exciplex, in which BPC@PPZ(where BPC is N-（4-bromophenyl）-carbazole, PPZ is 10-phenyl-10H-phenothiazine) achieved the highest quantum yield of 36.3%, while BPC@CE（where CE is coronene） showed the longest lifetime of 628.5 ms. The relevant data verify the mechanism that RTP comes from the charge transfer（CT） state of exciplex. Further, the introduction of Nile Red into the exciplex system results in the triple-singlet F?rster resonance energy transfer, exhibiting a red delayed fluorescence. Besides, when incorporating the coumarin derivatives into doping system, distinct1CT*&3CT* states are generated through the CT process, accompanying a brand-new long persistent luminescence excited by visible light. These findings present an approach to regulate the CT state for achieving different persistent luminescence in the multicomponent system.

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Self-reporting hypoxia-responsive supramolecular phototheranostic nanomaterials based on AIEgen and azocalixarene

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Science China Chemistry 2025年

作者： Xiao-Wen Han Guo-Ling Zhang Pu Chen Jing Zhang Guo-Gang Shan Chun-Xuan Qi Ben-Zhong Tang Hai-Tao Feng AIE research center Shaanxi Key Laboratory of Phytochemistry College of Chemistry and Chemical Engineering Baoji University of Arts and Sciences national & Local United engineering Laboratory for Power Batteries Department of Chemistry Northeast Normal University School of Science and engineering Shenzhen Institute of Aggregate Science and Technology The Chinese University of Hong KongShenzhen (CUHK-Shenzhen)

Hypoxia is a significant feature in most of solid tumors. Hence, developing hypoxia-responsive phototheranostic system is still a challenge. In this contribution, a supramolecular assembly strategy based on sulfonate-functionalized azocalix[4]arene(SAC4A)and cationic aggregation-induced emission photosensitizer(namely TPA-H) was proposed for hypoxia-responsive bioimaging and photodynamic therapy(PDT). Upon supramolecular complexation of TPA-H and SAC4A through electrostatic interaction,the fluorescence and reactive oxygen species(ROS) generation of TPA-H were largely inhibited. In hypoxic tumors, the azo group of SAC4A can be reduced to aniline derivative and release the included TPA-H to recover its pristine fluorescence and ROS. Interestingly, the free TPA-H undergoes cell membrane-to-mitochondria translocation during cell imaging, achieving a real-time self-reporting PDT system. In vivo tumor imaging and therapy reveal that this as-prepared supramolecular complexes have good biosafety and efficient antitumor activity under hypoxia. Such hypoxia-responsive supramolecular photosensitizer system will enrich image-guided photodynamic therapy.

关键词： Hypoxia is a significant feature in most of solid tumors. Hence, developing hypoxia-responsive phototheranostic system is still a challenge. In this contribution, a supramolecular assembly strategy based on sulfonate-functionalized azocalixarene(SAC4A)and cationic aggregation-induced emission photosensitizer(namely TPA-H) was proposed for hypoxia-responsive bioimaging and photodynamic therapy(PDT). Upon supramolecular complexation of TPA-H and SAC4A through electrostatic interaction,the fluorescence and reactive oxygen species(ROS) generation of TPA-H were largely inhibited. In hypoxic tumors, the azo group of SAC4A can be reduced to aniline derivative and release the included TPA-H to recover its pristine fluorescence and ROS. Interestingly, the free TPA-H undergoes cell membrane-to-mitochondria translocation during cell imaging, achieving a real-time self-reporting PDT system. In vivo tumor imaging and therapy reveal that this as-prepared supramolecular complexes have good biosafety and efficient antitumor activity under hypoxia. Such hypoxia-responsive supramolecular photosensitizer system will enrich image-guided photodynamic therapy.

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Advances in CRISPR-based gene editing technology and its application in nucleic acid detection

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BIOCELL 2025年第1期49卷 21-43页

作者： LIUJIE CHEN LILI DUAN JIA LI JUN CHEN DUANFANG LIAO NONGYUE HE KAI LI ZHENG HU Translational Medicine Institute the First People’s Hospital of ChenzhouHengyang Medical SchoolUniversity of South ChinaChenzhou423000China The First Clinical College of Xiangnan University The First Affiliated Hospital of Xiangnan UniversityChenzhou423000China national engineering research center of Personalized Diagnostic and Therapeutic technology Hunan University of Chinese MedicineChangsha410208China State Key Laboratory of Digital Medical engineering School of Biological Science and Medical EngineeringSoutheast UniversityNanjing210096China

Nucleic acid analysis is a key technique that enables accurate detection of various *** nucleic acid testing typically requires access to specialized laboratories,equipment,and trained personnel,which hinders the widespread use of on-site testing for DNA and RNA ***,integrating gene editing technology with traditional nucleic acid detection methods,especially isothermal amplification technology,can help overcome the limitations associated with on-site *** combination can accomplish precise and swift detection of nucleic acid sequences,offering a robust tool for on-site *** Clustered Regularly Interspaced Short Palindromic Repeats/CRISPR-associated proteins(CRISPR/Cas)technology,which comprises the CRISPR system and Cas effector proteins,is a powerful tool that is advancing the field of nucleic acid ***,Cas12,Cas13,and Cas14 proteins have emerged as straightforward,effective,precise,sensitive,and cost-effective methods for in vitro nucleic acid detection because of their“collateral cleavage”*** combined with the“collateral cleavage”ability of Cas protein and isothermal amplification,CRISPR/Cas systems have great potential to advance nucleic acid *** article summarizes the research progress of different CRISPR/Cas systems and their applications in nucleic acid detection and future perspectives.

关键词： CRISPR/Cas Pathogen Clinical application

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Fracture behavior of sandstone with partial filling flaw under mixed-mode loading: Three-point bending tests and discrete element method

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Journal of Rock Mechanics and Geotechnical engineering 2025年第1期17卷 291-308页

作者： Dongdong Ma Yu Wu Xiao Ma Xunjian Hu Wenbao Dong Decheng Li Lingyu Li State Key Laboratory for Geomechanics and Deep Underground engineering China University of Mining and TechnologyXuzhou221116China State Key Laboratory of Structural Health and Safety of Bridges Wuhan430034China research center of Coastal and Urban Geotechnical engineering Zhejiang UniversityHangzhou310058China State Key Laboratory of Geomechanics and Geotechnical engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

The fracture behavior of natural fracture in the geological reservoir subjected to filling property,affects the crack initiation and propagation under stress *** filling flaws were intermediate between open fractures and filled fractures,the fracture response may be worth *** this work,the effect of the filling property of sandstone with partial filling flaws on the fracture behavior was systematically investigated based on three-point bending tests and the numerical approach of discrete element method(DEM).In the laboratory,semi-circular three-point bending tests were carried out with partial filling flaws of various filling *** on this,numerical simulations were used to further investigate the effect of the filling ratio and the inclination of the partial filling flaw on the mechanical and fracture responses,and the effect of the partial filling flaw under mixed-mode loading on the fracture mechanism was elucidated coupled with acoustic emission(AE)*** obtained results showed that the increase in filling strength and filling ratio of partial filling flaw led to an increase in peak strength,with a decreasing trend in peak strength with the inclination of partial filling *** terms of crack propagation pattern,the increasing filling strength of the partial filling flaw induced the transformation of the fracture mechanism toward deflection,with a tortuosity path,while the filling ratio and inclination of partial filling flaw led to fracture mechanism change from deflection to penetration and attraction,accompanied with a larger AE event source in ***,the b-value based on the Gutenberg-Richter equation fluctuated between 5 and 4 at low filling ratio and inclination and remained around 5 at high filling ratio and inclination of partial filling *** results may provide an application prospective for reservoir stimulation using the natural fracture system.

关键词： Partial filling flaw Mixed-mode loading Semi-circular three-point bending Acoustic emission(AE) b-value

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Frog tongue-inspired wettable microfibers for particles capture

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Science Bulletin 2025年第3期70卷 383-389页

作者： Jiahui Guo Lingyu Sun Han Zhang Yuanjin Zhao Department of Rheumatology and Immunology Nanjing Drum Tower HospitalSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Shenzhen research Institute Southeast UniversityShenzhen 518071China Chemistry and Biomedicine Innovation center ChemBioMed Interdisciplinary Research CenterNanjing UniversityNanjing 210023China

Fibers have been of great significance in our daily lives,especially in the industrial production of *** in this area has been focused on developing microfibers with superior functions to enhance the filtration performances of the ***,inspired by the frog’s predation mechanism using its tongues to swiftly grab flying insects,we propose novel porous wettable microfibers from microfluidics to efficiently capture particles in the air for *** pre-dispersing LP emulsions into polyurethane(PU),porous microfibers dispersed with oil droplets could be continuously spun from a co-flow microfluidic device based on the quick phase inversion of *** design an optimal system with frog-tongue-like interfacial adhesion properties,the wettability performances of the porous microfibers are investigated under full,partial,and no oil coverage *** implemented in a mask,the 3D patterned networks based on the frog-tongue-inspired microfibers have been proven with remarkable particle capture performances while maintaining good air *** on these features,we believe that frog-tongue-inspired microfibers and their derived masks are of practical significance in multiple applications.

关键词： Bioinspired Microfluidics Microfiber Wettability Mask

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