检索结果-南通市图书馆

Multiphysics simulation and optimization of the in-situ beneficiation process of ilmenite minerals from lunar regolith

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2025年第1期68卷 195-207页

作者： Peng ZHANG Xin LIU Guanghui LIU wei DAI Hanzhe yang Haibo ZHENG Zhi WANG Ran NIU Yifan BAI yang ZHANG Chengbao LIU Ge yang Junwei yang Guang ZHANG Technology and Engineering Center for Space Utilization Chinese Academy of SciencesBeijing100094China Beijing Hegong Simulation Co. LtdBeijing100089China

The exploration and utilization of lunar resources have become the major objectives of future lunar exploration *** classified collection and processing of lunar minerals is the basic prerequisite for the in-situ exploration and utilization of lunar *** this study,we propose a scheme for in-situ separation of magnetic minerals from lunar soils using the dry magnetic separation *** scheme can realize the purpose of separating magnetic minerals from lunar regolith by altering the motion trajectory of lunar regolith particles with different magnetic *** modeling of the dry magnetic separation device is conducted,and the three-dimensional distribution of magnetic parameters is calculated and *** on the characterization and analysis of the Chang E-5's samples,the morphologies and physical parameters of lunar regolith particles are modeled and simulated.A discrete element simulation of the motion process of lunar regolith particles under multi-physical field conditions is performed,and the influences of key parameters on the beneficiation performance of lunar magnetic minerals are *** results indicate that optimal separation and beneficiation of lunar regolith particles can be achieved under specific conditions of magnetic field strength and drum ***,we analyze the effects of lunar weak gravity conditions and the charged nature of lunar particles on the beneficiation process,showing that these factors can obviously enhance the beneficiation process of lunar *** study demonstrates the feasibility of using the dry magnetic separation method for the beneficiation of magnetic minerals from lunar regolith,providing a theoretical basis for the scientific tasks of collecting,processing,and utilizing lunar mineral resources.

关键词： Lunar regolith In-situ resource utilization Magnetic separation Classified sampling

Performance Evaluation of Damaged T-Beam Bridges with External Prestressing Reinforcement Based on Natural Frequencies

在线全文

学校读者我要写书评

暂无评论

Structural Durability & Health Monitoring 2025年第2期19卷 399-415页

作者： Menghui Hao Shanshan Zhou Yongchao Han Zhanwei Zhu qiang yang Panxu Sun Jiajun Fan Henan Zhonggong Design&Research Group Co. Ltd.Zhengzhou450000China School of Civil Engineering Zhengzhou UniversityZhengzhou450001China

As an evaluation index,the natural frequency has the advantages of easy acquisition and quantitative *** this paper,the natural frequency is used to evaluate the performance of external cable reinforced *** examples show that compared with the natural frequencies of first-order modes,the natural frequencies of higher-order modes are more sensitive and can reflect the damage situation and external cable reinforcement effect of T-beam *** damaged bridges,as the damage to the T-beam increases,the natural frequency value of the bridge gradually *** the degree of local damage to the beam reaches 60%,the amplitude of natural frequency change exceeds 10%for the first *** natural frequencies of the firstorder vibration mode and higher-order vibration mode can be selected as indexes for different degrees of the damaged T-beam *** damaged bridges reinforced with external cables,the traditional natural frequency of the first-order vibration mode cannot be used as the index,which is insensitive to changes in prestress of the external *** natural frequencies of higher-order vibration modes can be selected as indexes,which can reflect the reinforcement effect of externally prestressed damaged T-beam bridges,and its numerical value increases with the increase of external prestressed cable force.

关键词： Performance evaluation natural frequency T-beam bridge damage external cable reinforcement

Auxiliary-field Monte Carlo method for frustrated spin systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2025年第2期34卷 118-122页

作者： Ning Cai Yuan Gao wei Li yang Qi State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China School of Physics Beihang UniversityBeijing 100191China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China

We extend a semiclassical numerical method, bosonic auxiliary-field Monte Carlo, to quantum spin systems. This method breaks the lattice into clusters, solves each cluster precisely and couples them with classical auxiliary fields through classical Monte Carlo simulation. We test the method with antiferromagnetic spin models in one-dimensional chains, square lattices and triangular lattices, and obtain reasonable results at finite temperatures. This algorithm builds a bridge between classical Monte Carlo method and quantum methods. The algorithm can be improved with either progress in classical Monte Carlo sampling or the development of quantum solvers, and can also be further applied to systems with different lattices or interactions.

关键词： Monte Carlo quantum many-body system frustrated magnets

Metal nanoparticles decorated CoFe-(oxy)hydroxysulfides nanosheets fabricated by a general strategy for electrocatalytic water splitting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 26-38页

作者： Xiaodong yang Haochen Shen Xiaoming Xiao Zhichao Li Qi Zhou wei yang Bin Jiang Yongli Sun Luhong Zhang Zhenhua Yan School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

This study presents a novel method to fabricate metal-decorated,sulfur-doped layered double hydroxides(M/SLDH)through spontaneous redox and sulfurization *** developed Ag/SLDH and Pt/SLDH catalysts with abundant heterogeneous interfaces and hierarchical nanostructures demonstrated outstanding oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)performance,achieving low overpotentials of 212 and 35 mV at 10 mA cm^(-2)in 1 M KOH,*** both anode and cathode in water splitting,they required only 1.47 V to reach 10 mA cm^(-2)and exhibited high structural robustness,maintaining stability at 1000 mA cm^(-2)for 300 ***-situ Raman analysis revealed that the synergistic effects of metal nanoparticles and S doping significantly promote the transformation into the S-Co1-xFexOOH layer,which serves as the active phase for water ***,ultraviolet photoelectron spectroscopy(UPS)and density functional theory(DFT)analyses indicated that incorporating metal nanoparticles and S doping increase electron density near the Fermi level and reduce reaction energy barriers,thus enhancing intrinsic OER and HER *** study provides a scalable strategy for synthesizing high-performance electrocatalysts for water splitting,with promising potential for broader applications.

关键词： LDH Spontaneous reaction Metal nanoparticles Water splitting

声光可调滤光器400～1000nm宽带增透膜的制备

在线全文

学校读者我要写书评

暂无评论

压电与声光 2016年第5期38卷 704-707页

作者：谢强刘伟杨晓波中国电子科技集团公司第二十六研究所重庆400060 中国电子科技集团公司第四十四研究所重庆400060

针对声光可调滤光器的使用要求,对常用的几种薄膜材料进行了沉积实验,采用传统的撕离法及纳米划痕法测试了薄膜材料的附着力。选择TiO_2和SiO_2分别作为高、低折射率镀膜材料,通过不同方案对膜系进行了优化设计。采用电子束蒸发兼离子... 详细信息

针对声光可调滤光器的使用要求,对常用的几种薄膜材料进行了沉积实验,采用传统的撕离法及纳米划痕法测试了薄膜材料的附着力。选择TiO_2和SiO_2分别作为高、低折射率镀膜材料,通过不同方案对膜系进行了优化设计。采用电子束蒸发兼离子束辅助沉积技术,制备了附着力牢靠、光谱透射率满足使用要求的TeO2晶体400-1 000nm宽带增透膜。

关键词：声光可调滤光器宽带增透膜附着力纳米划痕法

A nuclide identification method ofγspectrum and model building based on the transformer

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2025年第1期36卷 80-93页

作者： Fei Li Chu-yang Luo Ying-Zi Wen Sheng Lv Feng Cheng Guo-qiang Zeng Jian-Feng Jiang Bing-Hai Li College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610000China Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu 610000China Department of Physics Universitat Politècnica de CatalunyaBarcelona 08028Spain Airborne Survey and Remote Sensing Center of Nuclear Industry Shijiazhuang 050000China Hebei Key Laboratory of Airborne Detection and Remote Sensing Technology Shijiazhuang 050000China

In current neural network algorithms for nuclide identification in high-background,poor-resolution detectors,traditional network paradigms including back-propagation networks,convolutional neural networks,recurrent neural networks,etc.,have been limited in research on γ spectrum analysis because of their inherent mathematical *** is difficult to make progress in terms of training data requirements and prediction *** contrast to traditional network paradigms,network models based on the transformer structure have the characteristics of parallel computing,position encoding,and deep stacking,which have enabled good performance in natural language processing tasks in recent ***,in this paper,a transformer-based neural network (TBNN) model is proposed to achieve nuclide identification for the first ***,the Geant4 program was used to generate the basic single-nuclide energy spectrum through Monte Carlo simulations.A multi-nuclide energy spectrum database was established for neural network training using random matrices of γ-ray energy,activity,and *** on the encoder–decoder structure,a network topology based on the transformer was built,transforming the 1024-channel energy spectrum data into a 32×32 energy spectrum sequence as the model *** experiments and adjustments of model parameters,including the learning rate of the TBNN model,number of attention heads,and number of network stacking layers,the overall recognition rate reached 98.7%.Additionally,this database was used for training AI models such as back-propagation networks,convolutional neural networks,residual networks,and long shortterm memory neural networks,with overall recognition rates of 92.8%,95.3%,96.3%,and 96.6%,*** indicates that the TBNN model exhibited better nuclide identification among these AI models,providing an important reference and theoretical basis for the practical application of transformers in the qualitative and quantitativ

关键词： Nuclide identification Neural network Transformer

Glial cell line-derived neurotrophic factor improves impaired colonic motility in experimental colitis mice through connexin 43

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2025年第8期31卷 82-95页

作者： wei yang Rui Liu Feng Xu Department of Gastroenterology The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052Henan ProvinceChina Medical School Xiangyang Vocational and Technical CollegeXiangyang 441021Hubei ProvinceChina

BACKGROUND Colonic motility dysfunction is a common symptom of ulcerative colitis(UC),significantly affecting patients’quality of *** suggests that glial cell line-derived neurotrophic factor(GDNF)plays a role in restoring colonic *** To investigate whether GDNF enhances aberrant colonic motility in mice with experimental colitis via connexin 43(Cx43).METHODS An experimental colitis model was induced in male C57BL/6 mice using dextran sodium sulfate(DSS).The measurement of colonic transit time was conducted,and colon tissues were evaluated through transmission electron microscopy and hematoxylin and eosin *** mice were treated with exogenous GDNF and Gap 19,a selective Cx43 *** Cx43 and GDNF levels were detected via immunofluorescence,immunohistochemistry,and real-time polymerase chain *** levels of inflammatory markers,including interleukin-1β,tumor necrosis factor-α,interleukin-6,and C-reactive protein,were quantified using enzyme-linked immunosorbent *** Experimental colitis was successfully induced using DSS,and the findings exhibited that the colonic transit time was significantly delayed in colitis mice relative to the UC group(P<0.01).GDNF treatment improved colonic transit time and alleviated intestinal inflammation in DSS-induced colitis mice(P<0.05).In the UC+Gap19+GDNF group,colitis symptoms,colonic transit time,and inflammatory marker levels remained comparable to those in the UC group,indicating that the therapeutic effects of GDNF in UC mice were blocked by Gap *** GDNF improves colonic motility in mice with experimental colitis through a partially Cx43-mediated *** holds promise as a therapeutic option for improving colonic motility in patients with colitis.

关键词： Glial cell line-derived neurotrophic factor Ulcerative colitis Colonic motility Connexin 43 Dextran sodium sulfate model

Prospects on mangrove knowledge services in the smart era:From plant atlas to knowledge graphs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2025年第1期68卷 111-127页

作者： Zhi-wei HOU Wenlong JING Cheng-Zhi QIN Ji yang Qing XIA Xiaoling YIN Key Laboratory of Guangdong for Utilization of Remote Sensing and Geographical Information System Guangdong Open Laboratory of Geospatial Information Technology and ApplicationGuangzhou Institute of GeographyGuangdong Academy of SciencesGuangzhou510070China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing100049China School of Traffic&Transportation Engineering Changsha University of Science and TechnologyChangsha410114China

Mangroves are crucial to the ecological security of the Earth and human *** management,conservation,and restoration are of great importance and necessitate the support of spatio-temporal information and multidisciplinary knowledge such as biology and *** knowledge services such as plant atlas provide illustrated textual knowledge of ***,this kind of service is oriented to information retrieval and is incapable of effectively mining and utilizing fragmented knowledge from multi-source heterogeneous data,facing the problem of“massive data,rare knowledge”.Knowledge graphs are capable of extracting,organizing,and fusing the knowledge contained in massive data into semantic networks that can be understood and computed by *** provide a solution for the realization of intelligent knowledge *** on the urgent need for mangrove knowledge acquisition,formal representation,and intelligent services,this paper proposes a research prospect on mangrove knowledge graphs and knowledge *** first analyze the similarities and differences between various domain-specific concepts of *** this basis,we define the mangrove knowledge graph as a large-scale knowledge base that integrates multi-disciplinary knowledge and spatio-temporal information with mangrove ecosystems as the ***,we propose a research framework for mangrove knowledge services that can realize the transformation from multi-modal data to intelligent knowledge services,including multiple research levels such as ubiquitous data sensing and aggregation,knowledge organization and graph construction,and intelligent mangrove knowledge ***,the methods and workflow for constructing mangrove knowledge graphs are ***,we discuss the challenges and possible future directions of mangrove knowledge services in the smart era,including the construction of a mangrove knowledge system that integrates the domain-specific charac

关键词： Mangrove Tupu Knowledge graph Multi-modal Knowledge service

Arbuscular mycorrhizal fungi promote functional gene regulation of phosphorus cycling in rhizosphere microorganisms of Iris tectorum under Cr stress

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2025年第5期151卷 187-199页

作者： Sixi Zhu Huan Mao Suxia Sun Xiuqin yang wei Zhao Luying Sheng Zhongbing Chen College of Eco-environment Engineering Guizhou Minzu UniversityThe Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs CommissionGuiyang 550025China Department of Applied Ecology Faculty of Environmental SciencesCzech University of Life Sciences PragueKamycka 129Praha-Suchdol 16500Czech Republic

The mutualistic symbiotic system formed by clumping arbuscular mycorrhizal fungi(AMF)and plants can remediate heavy metal-contaminated ***,the specific mechanisms underlying the interaction between AMF and inter-root microbial communities,particularly their impact on organic phosphorus(P)cycling,remain *** study investigated the gene regulation processes involved in inter-root soil phosphorus cycling in wetland plants,specifically Iris tectorum,following inoculation with AMF under varying concentrations of chromium(Cr)*** macro-genome sequencing,we analyzed the composition and structure of the inter-root soil microbial community associated with Iris tectorum under greenhouse pot *** results demonstrated significant changes in the diversity and composition of the inter-root soil microbial community following AMF inoculation,with Proteobacteria,Actinobacteria,Chloroflexi,Acidobacteria,and Bacteroidetes being the dominant *** Cr stress,species and gene co-occurrence network analysis revealed that AMF promoted the transformation process of organic phosphorus mineralization and facilitated inorganic phosphorus ***,network analysis of functional genes indicated strong aggregation of(pstS,pstA,pstC,***,phoR,pp-gppA)genes,which collectively enhanced phosphorus uptake by *** findings shed light on the inter-root soil phosphorus cycling process during the co-remediation of Cr-contaminated soil by AMF-Iris tectorum symbiosis,providing valuable theoretical support for the application of AMF-wetland plant symbiosis systems to remediate heavy metal-contaminated soil.

关键词： Metagenome Arbuscular mycorrhizal fungi Phosphorus Iris tectorum Cr