检索结果-南通市图书馆

Measuring the magnetic topological spin structure of light using an anapole probe

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2022年第10期11卷 2503-2511页

作者： fanfei meng Aiping Yang Kang Du Fengyang Jia Xinrui Lei Ting Mei Luping Du Xiaocong Yuan Nanophotonics Research Centre Institute of Microscale OptoelectronicsShenzhen University518060 ShenzhenChina MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology School of Physical Science and TechnologyNorthwestern Polytechnical University710129 Xi'anChina

Topological spin structures of light,including the Skyrmion,Meron,and bi-Meron,are intriguing optical phenomena that arise from spin-orbit coupling.They have promising potential applications in nano-metrology,data storage,super-resolved imaging and chiral detection.Aside from the electric part of optical spin,of equal importance is the magnetic part,particularly the H-type electromagnetic modes for which the spin topological properties of the field are dominated by the magnetic field.However,their observation and measurement remains absent and faces difficult challenges.Here,we design a unique type of anapole probe to measure specifically the photonic spin structures dominated by magnetic fields.The probe is composed of an Ag-core and Si-shell nanosphere,which manifests as a pure magnetic dipole with no electric response.The effectiveness of the method was validated by characterizing the magnetic field distributions of various focused vector beams.It was subsequently employed to measure the magnetic topological spin structures,including individual Skyrmions and Meron/Skyrmion lattices for the first time.The proposed method may be a powerful tool to characterize the magnetic properties of optical spin and valuable in advancing spin photonics.

关键词： field. topological dipole

Strength test of 3D printed artificial rock mass with pre-existing fracture

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Underground Space 2021年第5期6卷 492-505页

作者： Youyu Wang Li Wang fanfei meng Kang Chen College of Civil Engineering Chongqing UniversityChongqing 400050China School of Civil Engineering and Transportation Hebei University of TechnologyTianjin 300132China

Discontinuities or structural planes are widely distributed in natural rock masses and significantly influence their geo-mechanical and geometric properties.Herein,a batch of rock samples,each with a single structural plane,is created using a 3D printer equipped with two robotic manipulators.One of the manipulators is connected via a nozzle to a concrete pumping truck,which can extrude brittle rock-like material to form layered intact rock masses;the rock-like material is mainly composed of cement,silica fume,sand and water.The other manipulator features a knife,which can carve discontinuities onto each layer of the printed model.By means of this system,rock masses with discontinuous joints are formed,and the failure strengths of rock masses with different joints are demonstrated via uniaxial compression tests and direct shear tests.The results thereof obtained via digital image correlation technology show that discontinuities lower the strength of the rock mass models significantly.With the increase of the angle between the fracture and horizontal plane,the uniaxial compressive strength first decreases,and then increases.During shear testing,the shear strength of the rock mass models increases with the surface roughness of the preset joint.These test results indicate that the influence of artificial joints on the mechanical properties of the models is consistent with that of natural rock mass joints.Using digital modeling and 3D printing technology,cracks hidden in a rock mass can be reproduced.

关键词： Discontinuous rock mass 3D printing Digital image correlation Rock-like material Strength failure

Time effect and prediction of broken rock bulking coefficient on the base of particle discrete element method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2021年第4期31卷 643-651页

作者： fanfei meng Hai Pu Takashi Sasaoka Hideki Shimada Sifei Liu Tumelo KM Dintwe Ziheng Sha Department of Earth Resources Engineering Faculty of EngineeringKyushu UniversityFukuoka 819-0395Japan State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China College of Mining Engineering and Geology Xinjiang Institute of EngineeringUrumqi 830023China

Bulking characteristics of gangue are of great significance for the stability of goafs in mining overburden in the caving zones.In this paper,a particle discrete element method with clusters to represent gangue was adopted to explore the bulking coefficient time effect of the broken rock in the caving zone under three-dimensional triaxial compression condition.The phenomena of stress corrosion,deformation,and failure of rock blocks were simulated in the numerical model.Meanwhile,a new criterion of rock fragments damage was put forward.It was found that the broken rock has obvious viscoelastic properties.A new equation based on the Burgers creep model was proposed to predict the bulking coefficient of broken rock.A deformation characteristic parameter of the prediction equation was analyzed,which can be set as a fixed value in the mid-and long-term prediction of the bulking coefficient.There are quadratic function relationships between the deformation characteristic parameter value and Talbot gradation index,axial pressure and confining pressure.

关键词： Bulking coefficient Time effect Deformation prediction Broken rock Particle discrete element model

Application Effect of Sludge Extract in the Planting of Zinnia elegans

在线全文

学校读者我要写书评

暂无评论

Asian Agricultural Research 2022年第9期14卷 44-47,54页

作者： Yu FU Cheng YANG Lifang CUI fanfei meng Aiai YANG Guangneng ZENG College of Eco-environmental Engineering Guizhou Minzu UniversityGuiyang 550025China Solid Waste Pollution Control and Resource Engineering Research Center Guizhou Minzu UniversityGuiyang 550025China Guizhou Vocational Education Public Training Center Guiyang 551400China

[Objectives] The research aimed to study the effect of sludge extract on the growth of Zinnia elegans, and evaluate its possibility of application. [Methods] Z. elegans was taken as research object, and the effect of sludge extract on the growth indicators of Z. elegans was studied. [Results] The sludge extract can obviously promote the growth of Z. elegans, and the growth indicators were significantly improved when compared with the control group. The application effect was close to that of foliar fertilizer purchased in the market. In each treatment group, the low concentration of sludge extract did not significantly promote the growth of Z. elegans, while too high concentration could inhibit its growth, and the optimal dilution ratio was 600 times. [Conclusions] Further preparation of amino acid foliar fertilizer from sludge extract and its application in planting garden plants can realize the resource utilization of sludge and has a good development and application prospect.

关键词： Sludge extract Zinnia elegans Plant growth

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CFB锅炉掺烧气化细渣技术研究进展

化工环保 2024年第3期44卷 329-337页

作者：王坤金平廖昌建刘志禹赵清孟凡飞中石化(大连)石油化工研究院有限公司辽宁大连116045 中国石油青海油田分公司格尔木炼油厂青海格尔木816000

煤气化渣产量大、存量多,常规的填埋和堆积处理不但占用大量土地资源,而且还存在严重的污染风险和安全隐患。本文介绍了气化细渣的组成、结构和燃烧特性,综述了残碳富集、脱水干化等气化细渣预处理方法的研究进展,从气化细渣的含水率、... 详细信息

煤气化渣产量大、存量多,常规的填埋和堆积处理不但占用大量土地资源,而且还存在严重的污染风险和安全隐患。本文介绍了气化细渣的组成、结构和燃烧特性,综述了残碳富集、脱水干化等气化细渣预处理方法的研究进展,从气化细渣的含水率、灰分、掺烧比例及污染物排放情况等方面分析了气化细渣掺烧对循环流化床(CFB)锅炉燃烧的影响,指出CFB锅炉掺烧气化细渣具备显著的环保和经济效益,是气化细渣实现减量化、无害化和资源化利用的主要途径之一。

关键词：气化细渣 CFB锅炉掺烧资源化利用

Fast structured illumination microscopy via deep learning

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2020年第8期8卷 1350-1359页

作者： CHANG LING CHONGLEI ZHANG MINGQUN WANG fanfei meng LUPING DU XIAOCONG YUAN Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China

This study shows that convolutional neural networks(CNNs)can be used to improve the performance of structured illumination microscopy to enable it to reconstruct a super-resolution image using three instead of nine raw frames,which is the standard number of frames required to this end.Owing to the isotropy of the fluorescence group,the correlation between the high-frequency information in each direction of the spectrum is obtained by training the CNNs.A high-precision super-resolution image can thus be reconstructed using accurate data from three image frames in one direction.This allows for gentler super-resolution imaging at higher speeds and weakens phototoxicity in the imaging process.

关键词： networks illumination frames

Mapping the distributions of blood-sucking mites and mite-borne agents in China:a modeling study

在线全文

学校读者我要写书评

暂无评论

Infectious Diseases of Poverty 2022年第2期11卷 99-99页

作者： Tao Wang fanfei meng Tianle Che Jinjin Chen Haiyang Zhang Yang Ji Zhengwei Fan Guoping Zhao Wenhui Zhang Baogui Jiang Qiang Xu Chenlong Lv Taoxing Shi Shiman Ruan Lanzheng Liu Wei Liu Yang Yang Liqun Fang State Key Laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and Epidemiology20 Dong-Da StreetFengtai DistrictBeijing 100071People’s Republic of China 不详 Department of Biostatistics College of Public Health and Health Professions and Emerging Pathogens InstituteUniversity of FloridaGainesvilleFLUSA

Background:Emerging mite-borne pathogens and associated disease burdens in recent decades are raising serious public health concerns,yet their distributions and ecology remain under-investigated.We aim to describe the geographical distributions of blood-sucking mites and mite-borne agents and to assess their ecological niches in China.Methods:We mapped 549 species of blood-sucking mites belonging to 100 genera at the county level and eight mite-associated agents detected from 36 species of blood-sucking mites in China during 1978–2020.Impacts of climatic and environmental factors on the ecology of 21 predominant vector mites and a leading pathogen,Orientia tsutsugamushi,were assessed using boosted regression tree(BRT)models,and model-predicted risks were mapped.We also estimated the model-predicted number,area and population size of afected counties for each of the 21 mite species in China.Results:Laelaps echidninus is the leading mite species that potentially afects 744 million people,followed by La.jettmari(517 million)and Eulaelaps stabularis(452 million).Leptotrombidium scutellare is the mite species harboring the highest variety of mite-borne agents including four Rickettsia species and two viruses,followed by Eu.stabularis(2 agents),L.palpale(2)and La.echidninus(2).The top two agents that parasitize the largest number of mite species are O.tsutsugamushi(28 species)and hantavirus(8).Mammalian richness,annual mean temperature and precipitation of the driest quarter jointly determine the ecology of the mites,forming four clusters of major mite species with distinct geographic distributions.High-risk areas of O.tsutsugamushi are mainly distributed in southern and eastern coastal provinces where 71.5 million people live.Conclusions:Ecological niches of major mite species and mite-borne pathogens are much more extensive than what have been observed,necessitating expansion of current fled surveillance.

关键词： Mite Mite-borne pathogen Mite-borne disease Distribution Risk determinant China

Effects of Sublevel Open Stope Underground Mining on Surface and Open Pit Slopes

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 Geoscience and Environment Protection 2021年第1期9卷 121-131页

作者： Tumelo K. M. Dintwe Takashi Sasaoka Hideki Shimada Akihiro Hamanaka Dyson Moses Sifei Liu fanfei meng Department of Earth Resources Engineering Kyushu University Fukuoka Japan China University of Science and Technology Xuzhou China

Underground mining is an economically viable option for exploiting ore reserves deemed uneconomic after open pit mining. However, underground development can have adverse effects on the above existing open pit slope walls. As a goal of this paper, identification and assessment of potential slope instabilities prior to underground development is crucial for safe and sustainable mining. Towards goal achieving, this paper gives a comprehensive parametric study to investigate the influence of sublevel open stope (SLOS) underground mining on the surface and open pit slope walls. By means of numerical simulation, the SLOS design is tried against the existing open pit followed by adjustments of important slope parameters which are overall slope height (OSH) and overall slope angle (OSA). We found that underground mining may induce slope failure, particularly on the hangingwall side of the pit. Subsidence is prominent on the hanging wall and the surface, whereas, the uplift dominates the footwall and pit bottom. Pit wall closure is observed during underground mining. Although the assigned dimensions in the parametric study show a negligible effect of OSH and OSA, the high OSH experience low subsidence in comparison with low OSH. Overall, the results demonstrate that the slope walls on the hanging wall side are mostly affected by the underground mining and high-stress concentration prevails near slope toes and pit bottom. Additionally, slope deformation decrease from pit bottom towards the slope crest and surface. The results of this study add knowledge to open pit and underground mining interaction.

关键词： Open Pit-Underground Interaction Slope Stability Underground Mining Subsidence

子宫内膜癌组织中dMMR蛋白和miRNA Let-7表达水平及临床价值的研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

现代检验医学杂志 2024年第3期39卷 48-52,108页

作者：张亚军刘裴丽江月闫莉陈云云蒋欣孟凡菲连云港市妇幼保健院病理科江苏连云港222000 连云港市妇幼保健院妇科江苏连云港222000

目的探讨子宫内膜癌(endometrial carcinoma,EC)中微小RNA Let-7(miRNA Let-7)表达水平与DNA错配修复(DNA mismatch repair,dMMR)蛋白表达缺失的关系及意义。方法选取2016年5月~2022年12月在江苏省连云港市妇幼保健院行根治性手术切除... 详细信息

目的探讨子宫内膜癌(endometrial carcinoma,EC)中微小RNA Let-7(miRNA Let-7)表达水平与DNA错配修复(DNA mismatch repair,dMMR)蛋白表达缺失的关系及意义。方法选取2016年5月~2022年12月在江苏省连云港市妇幼保健院行根治性手术切除的子宫内膜癌患者74例,分别用免疫组织化学法检测dMMR蛋白(包括MLH1,PMS2,MSH2,MSH6)的表达、实时荧光定量聚合酶链反应(qRT-PCR)检测miRNA Let-7的相对表达量,按照dMMR蛋白表达情况,将EC患者分为表达完整组(n=43)和表达缺失组(n=31),采用Logistic多因素回归分析与dMMR蛋白缺失相关的危险因素、绘制受试者工作特征(receiver operating characteristic,ROC)曲线评估相关因素的预测价值。结果74例EC病例中,miRNA Let-7的表达水平在肌层浸润<1/2组显著高于肌层浸润≥1/2组,差异具有统计学意义(t=1.79,P=0.04);dMMR蛋白表达的缺失率为41.89%,且年龄<55岁组和miRNA Let-7低表达组(<0.715)患者中的dMMR蛋白缺失率高于≥55岁组和miRNA Let-7高表达组(≥0.715),差异具有统计学意义(χ2=3.92,4.50,均P<0.05);Logistic多因素回归分析结果显示miRNA Let-7表达水平是发生dMMR表达缺失的独立危险因素(P=0.012);Spearman相关分析表明,miRNA Let-7的表达水平与dMMR蛋白缺失呈明显负相关(r=-0.247,P=0.034);ROC曲线分析结果显示,miRNA Let-7表达水平对于预测EC患者中发生dMMR蛋白的缺失具有一定的价值,其AUC为0.737,最佳临界值为0.77,敏感度和特异度分别为0.651,0.806。结论子宫内膜癌患者中miRNA Let-7的表达水平与dMMR蛋白缺失具有相关性,也是发生dMMR蛋白缺失的危险因素,有望为预测dMMR的表达缺失提供帮助。

关键词：子宫内膜癌林奇综合征 DNA 错配修复蛋白微小RNA Let-7