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Separation of the ionospheric and thermospheric contributions in the data from the Triple Ionosophere Photo Meter onboard the Feng-Yun 3E satellite

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Science China Earth Sciences 2025年第1期68卷 172-184页

作者： Fang JIANG Tian MAO Jin-Song WANG Xiu-Qing HU Xiao-Xin ZHANG Liping fu Nan JIA Tianfang WANG National Space Science Center Chinese Academy of SciencesBeijing100090China Beijing Key Laboratory of Space Environment Exploration Beijing100090China Key Laboratory of Environmental Space Situation Awareness Technology Beijing100090China National Satellite Meteorological Center China Meteorological AdministrationBeijing100081China

The Triple Ionosphere Photo Meter(TRIPM)is a far ultraviolet nadir-view photometer that is onboard the secondgeneration,polar-orbiting Chinese meteorological satellite Feng-Yun 3E(FY-3E),which was launched on July 5,*** has three channels,and each is used to measure different types of emissions:(1)135.6 nm airglow produced by the recombination of the O+ions and electrons in the absence of sunlight(nighttime channel);(2)135.6 nm airglow from the OI when sunlight is present(daytime/dusk-dawn 135.6 nm channel);and(3)Airglow in the N_(2)LBH of the TRIPM(daytime/dusk-dawn N_(2)LBH channel).FY-3E is a satellite operating in the early morning ***,the data are mostly distributed on the dawndusk side or at times when the solar zenith angle is relatively *** this study,combined with simulation calculations,the data are *** further explore the application value of the data products,a model is used to separate the ionospheric radiative recombination contribution from the thermosphere photoelectron impact excitation contribution in the data from the daytime/dusk-dawn 135.6 nm *** approach not only improves the accuracy of O/N_(2)derived from the 135.6 nm channel and N_(2)LBH channel but also provides the ionospheric 135.6 nm radiance at the same time as the *** results show that the 135.6 nm radiance originating from the combination of O+and electrons extracted from the measurement data exhibits similar equatorial anomaly peak structure characteristics and seasonal variations as the corresponding GPS total electron content(TEC)*** the other hand,the separated 135.6 nm radiance generated from the thermosphere photoelectron collision excitation does not contain radiative recombination contributions;thus,the ionosphere influence is greatly avoided when the O/N_(2)is obtained.

关键词： Far ultraviolet 135.6 nm emission intensity Photoelectron impact excitation Radiative recombination excitation

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Bacterial indole-3-propionic acid inhibits macrophage IL-1β production through targeting methionine metabolism

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Science China Life Sciences 2025年

作者： Ziyi Han Jian fu Aiyan Gong Wenkai Ren State Key Laboratory of Livestock and Poultry Breeding College of Animal Science South China Agricultural University Animal Disease-resistant Nutrition Key Laboratory of Sichuan Province Sichuan Agricultural University China Institute of Veterinary Drug Control

The gut microbiota plays key roles in host health by shaping the host immune responses through their metabolites, like indole derivatives from tryptophan. However, the direct role of these indole derivatives in macrophage fate decision and the underlying mechanism remains unknown. Here, we found that bacterial indole-3-propionic acid(IPA) downregulates interleukin-1beta(IL-1β) production in M1 macrophages through inhibition of nuclear factor-kappa B(NF-κB) signaling. Mechanistically, IPA binds specifically with methionine adenosyltransferase 2A(MAT2A) to promote S-adenosylmethionine(SAM) synthesis, which facilitates the DNA methylation of ubiquitin-specific peptidase 16(USP16, a deubiquitinase), and in turn promotes Toll-like receptor 4(TLR4) ubiquitination and NF-κB inhibition. furthermore,IPA administration attenuates sepsis in mouse models induced by lipopolysaccharides(LPS), showcasing its potential as a microbial-derived adjunct in alleviating inflammation. Collectively, our findings reveal a newly found microbial metabolite-immune system regulatory pathway mediated by IPA.

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A Systematic Thermodynamic Analysis of the Thermally Regenerative Electrochemical Cycle

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Journal of Thermal Science 2025年第02期 389-399页

作者： fu Shen TANG Xin LIU Penghui LI Guiqiang Department of Thermal Science and Energy Engineering University of Science and Technology of China

Thermally regenerative electrochemical cycle(TREC) is a novel and effective heat-to-electricity technology for harvesting low-grade ***,reported TREC analyses have been based on the Stirling cycle of ideal infinite heat source and infinite time for heat ***,this will lead to inaccuracy when the scenario deviates from the ideal *** this study,a systematic thermodynamic analysis on TREC is performed to address this *** on different heat transfer situations,the description of thermodynamic processes and the corresponding mathematical models are *** the same time,the TREC system,with the solar collector as the high-temperature heat source and the environment as the low-temperature heat source,is employed as a *** the study delved into discrepancies arising from incongruences between the practical operational process and the traditional ideal analytical methodologies,along with an investigation of the different thermal environment impact on system *** findings suggest that the finite analysis method should be used when the actual operating time of the system is shorter than the desired equilibrium *** the contrary,the use of the infinite analysis method,in this case,produces an error,the magnitude of which is directly related to the operating time,whereas when the time reaches 80% of the equilibrium time the error can be controlled to less than 2%.The influence of the heat source on the operating phase of the system is mainly in the temperature equilibrium and the rate of temperature *** effect is proportional to the thermal capacitance and is also positively related to the system ***,to improve system performance,it is recommended that a high-temperature heat source with a high ratio of thermal capacitance to system thermal capacitance should be selected and that the response time should slightly exceed the system equilibrium duration.

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RIS-Assisted Receive Spatial Modulation for High-Speed Railway Communication

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China Communications 2025年第2期22卷 269-282页

作者： Ding Qingfeng Wang Song fu Tingmei Xi Tao School of Electrical and Automation Engineering East China Jiaotong UniversityNanchang 330013China China Railway Communication and Signal Survey&Design Institute Co.Ltd Beijing 100071China

In high-speed railway(HSR)wireless communication,the rapid channel changes and limited high-capacity access cause significant impact on the link ***,the Doppler shift caused by high mobility leads to the inter-carrier *** this paper,we propose a reconfigurable intelligent surface(RIS)-assisted receive spatial modulation(SM)scheme based on the spatial-temporal correlated HSR Rician *** characteristics of SM and the phase shift adjustment of RIS are used to mitigate the performance degradation in high mobility *** the influence of channel spatial-temporal correlation and Doppler shift,the effects of different parameters on average bit error rate(BER)performance and upper bound of ergodic capacity are ***,a joint antenna and RIS-unit selection algorithm based on the antenna removal method is proposed to increase the capacity performance of communication *** results show that the proposed RIS-assisted receive SM scheme can maintain high transmission capacity compared to the conventional HSR-SM scheme,whereas the degradation of BER performance can be compensated by arranging a large number of *** addition,selecting more RIS-units has better capacity performance than activating more antennas in the low signal-to-noise ratio regions.

关键词： average bit error rat high-speed railway joint antenna and RIS-unit selection receive spatial modulation reconfigurable intelligent surface

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Optimal Operation Strategy for Rural Microgrid Considering Greenhouse Load Control

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CSEE Journal of Power and Energy Systems 2025年第1期11卷 269-279页

作者： Xueqian fu Yazhong Zhou Zhonghui Wei Yang Wang College of Information and Electrical Engineering China Agricultural UniversityBeijing100083China Beijing Engineering and Technology Research Center for Internet of Things in Agriculture Key Laboratory of Smart Farming Technologies for Aquatic Animal and LivestockMinistry of Agriculture and Rural AffairsBeijing 100083China

Impact of rural electrification is picking up,which has changed the energy structure and significantly reduced greenhouse gas emissions in rural *** present,due to separation management of agricultural and energy systems,agricultural cost is high,and new energy consumption in the local microgrid is small,but carbon emission is *** propose a novel optimal operation strategy for a rural microgrid considering greenhouse load control,which is greenhouse environment *** establish a greenhouse load control model,including an artificial lighting model,a heating load model,and a load shifting *** characteristic work is to establish a carbon dioxide model of greenhouse consumption,and we build a unique optimal operation model of a rural microgrid by combining control of carbon dioxide and control of the energy *** simulate a rural microgrid with wind power,photovoltaic,gas-fired boiler,and cogeneration *** and winter scenarios are used for analysis,as energy consumption patterns in greenhouses during these seasons are highly *** show the proposed optimization strategy can effectively cut operating expenses for the rural microgrid,improve rate of new energy consumption in the local microgrid,and reduce carbon dioxide emissions.

关键词： Carbon dioxide emission greenhouse load control microgrid rural development rural electrification

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Passive-state preparation for quantum secure direct communication

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Science China(Physics,Mechanics & Astronomy) 2025年第04期Mechanics & Astronomy) .卷 39-48页

作者： Jia-Wei Ying Jin-Yu Wang Yu-Xiang Xiao shi-Pu Gu Xing-fu Wang Wei Zhong Ming-Ming Du Xi-Yun Li Shu-Ting Shen An-Lei Zhang Lan Zhou Yu-Bo Sheng College of Electronic and Optical Engineering and College of Flexible Electronics (future Technology) Nanjing University of Posts and Telecommunications Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications College of Science Nanjing University of Posts and Telecommunications

Quantum secure direct communication（QSDC） can transmit the secret message directly. Single-photon-based QSDC protocol requires the active modulation of the quantum state of the source, potentially introducing various side-channel vulnerabilities. In this paper, we propose a passive-state preparation QSDC protocol. By utilizing a passive-state preparation method, we remove the need for active modulation, thus eliminating the side-channel risks associated with the source encoder. To evaluate the performance of the protocol, we develop a system model and improve the decoy state method. Through parameter optimization,we identify the optimal secrecy message capacity for various communication distances and compare it with active modulation QSDC. At a communication distance of 10（15） km, the secrecy message capacity of passive-state preparation QSDC reaches3.894 × 10-4（3.715 × 10-5） bit/pulse, achieving 95.3%（91.5%） of the active case's performance. Meanwhile, we consider the resource consumption and optimize the secrecy message transmission rate of passive-state preparation QSDC. Using a coherent light source with a frequency of 10～6Hz, at communication distances of 5, 10, and 15 km, the secrecy message transmission rates for passive-state preparation QSDC reach 2.370 × 10～2, 4.218 × 10, and 2.504 bit/s, respectively.

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利用米根霉混合培养饲用布拉迪酵母BS-F1的研究

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中国饲料 2025年第1期 51-56页

作者：李孝辉付浩吴杰邓波浙江省农业科学院植物保护与微生物研究所浙江杭州310021 浙江省农业科学院畜牧兽医研究所浙江杭州310021

本研究旨在利用米根霉和布拉迪酵母菌BS-F1混合培养的方法来生产饲用布拉迪酵母,并对其生产工艺进行优化,对混合发酵培养基进行了单因素和正交试验。结果表明:混合培养最佳培养基为玉米6%、豆粕3%、磷酸氢二铵0.2%。通过优化培养基组分... 详细信息

本研究旨在利用米根霉和布拉迪酵母菌BS-F1混合培养的方法来生产饲用布拉迪酵母,并对其生产工艺进行优化,对混合发酵培养基进行了单因素和正交试验。结果表明:混合培养最佳培养基为玉米6%、豆粕3%、磷酸氢二铵0.2%。通过优化培养基组分和培养条件后,利用米根霉混合发酵,布拉迪酵母菌数可达到14.3亿/mL。

关键词：米根霉布拉迪酵母混合培养

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Theoretical Screening of Transition Metal Single Atoms Anchored onγ-Graphyne as Electrocatalysts for Nitrogen Reduction Reaction

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Chinese Journal of Chemical Physics 2025年第1期38卷 63-72,I0023-I0031,I0056页

作者： Hang Li Qiang fu Zhenyu Li Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China School of future Technology University of Science and Technology of ChinaHefei 230026China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of ChinaHefei 230026China

Ammonia(NH_(3))plays an important role in the world economy and its demand is steadily rising alongside the progress of modern *** electrocatalytic nitrogen reduction reaction(NRR)is presently regarded as a high-po-tential method for the synthesis of NH_(3).Nev-ertheless,the development of efficient NRR electrocatalysts remains a challenging *** this study,various transition metal(TM)sin-gle atoms(TM=Sc-Zn,Y-Cd except Tc,and Ta-Pt)anchored onγ-graphyne(γ-GY)are sys-tematically investigated as NRR electrocatalysts using density functional theory(DFT)*** to several criteria regarding the adsorption stability of isolated TM sin-gle atoms onγ-graphyne,the adsorption properties of N_(2) on these TM single atoms,the ad-sorption competition between N_(2) and H,and the free energy change in the initial protonation process for N_(2),we find that Os@γ-GY and Re@γ-GY may be suitable electrocatalysts for NRR,and analyze the reasons why the two types of single atoms can well adsorb and activate N_(2) *** the reaction pathways of NRR catalyzed by the two single-atom systems,we further find that NRR is hindered by the step of*NH_(2) hydrogenation to*NH_(3) on Re@γ-GY but can proceed well on Os@γ-***,Os@γ-GY behaves best in catalyzing NRR among theγ-GY anchored single atom systems *** work has the potential to offer valuable recommendations for the development of novel and highly effective NRR electrocat-alysts.

关键词： Electrocatalytic synthesis of ammonia Transition metal Single-atom catalyst γ-Graphyne First principle

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Human neural stem cell-derived extracellular vesicles protect against ischemic stroke by activating the PI3K/AKT/mTOR pathway

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Neural Regeneration Research 2025年第11期20卷 3245-3258页

作者： Jiayi Wang Mengke Zhao Dong fu Meina Wang Chao Han Zhongyue Lv Liang Wang Jing Liu Stem Cell Clinical Research Center The First Affiliated Hospital of Dalian Medical UniversityDalianLiaoning ProvinceChina Dalian Innovation Institute of Stem Cell and Precision Medicine DalianLiaoning ProvinceChina Institute(College)of Integrative Medicine Dalian Medical UniversityDalianLiaoning ProvinceChina

Human neural stem cell-derived extracellular vesicles exhibit analogous functions to their parental cells,and can thus be used as substitutes for stem cells in stem cell therapy,thereby mitigating the risks of stem cell therapy and advancing the frontiers of stem cell-derived *** lays a foundation for the development of potentially potent new treatment modalities for ischemic ***,the precise mechanisms underlying the efficacy and safety of human neural stem cell-derived extracellular vesicles remain unclear,presenting challenges for clinical *** promote the translation of therapy based on human neural stem cell-derived extracellular vesicles from the bench to the bedside,we conducted a comprehensive preclinical study to evaluate the efficacy and safety of human neural stem cell-derived extracellular vesicles in the treatment of ischemic *** found that administration of human neural stem cell-derived extracellular vesicles to an ischemic stroke rat model reduced the volume of cerebral infarction and promoted functional recovery by alleviating neuronal *** human neural stem cell-derived extracellular vesicles reduced neuronal apoptosis by enhancing phosphorylation of phosphoinositide 3-kinase,mammalian target of rapamycin,and protein kinase B,and these effects were reversed by treatment with a phosphoinositide 3-kinase *** findings suggest that human neural stem cell-derived extracellular vesicles play a neuroprotective role in ischemic stroke through activation of phosphoinositide 3-kinase/protein kinase B/mammalian target of rapamycin signaling ***,we showed that human neural stem cell-derived extracellular vesicles have a good in vivo safety ***,human neural stem cell-derived extracellular vesicles are a promising potential agent for the treatment of ischemic stroke.

关键词： behavior exosome extracellular vesicles ischemic stroke mammalian target of rapamycin(mTOR) middle cerebral artery occlusion neural stem cells neuronal apoptosis phosphoinositide 3-kinase(PI3K) protein kinase B(AKT)

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Bistable switch molecule DPACdCl_(4) showing four physical channels and high phase transition temperature

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Chinese Chemical Letters 2025年第1期36卷 591-596页

作者： Ying-Yu Zhang Jia-Qi Luo Yan Han Wan-Ying Zhang Yi Zhang Hai-Feng Lu Da-Wei fu Institute for Science and Applications of Molecular Ferroelectrics Key Laboratory of the Ministry of Education for Advanced Catalysis MaterialsZhejiang Normal UniversityJinhua 321004China Ordered Matter Science Research Center Jiangsu Key Laboratory for Science and applications of Molecular FerroelectricsSoutheast UniversityNanjing 211189China

Multiple switchable physical channels within one material or device,encompassing optical,electrical,thermal,and mechanical pathways,can enable multifunctionality in mechanical-thermal-opto-electronic *** integrated encryption and enhanced performance in storage and sensing presents a formidable challenge in the synthesis and functionality of new *** an effort to overcome the complexities associated with these multiple physical functions,this study investigates the large-size crystal of DPACdCl_(4)(DPA=diisopropylammonium),revealing significant features in rare multi-channel *** compound demonstrates the ability to switch between"OFF/0"and"ON/1"states in the mechanical-thermal-opto-electronic ***,DPACd Cl_(4)possesses four switchable physical channels,characterized by a higher phase transition temperature of 440.7 K and a competitive piezo-electric coefficient of 46 pC/***,solid-state NMR analysis indicates that thermally activated molecular vibrations significantly contribute to its multifunctional switching capabilities.

关键词： Organic-inorganic hybrid Phase transition Crystal Perovskite Piezoelectricity

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