检索结果-南通市图书馆

Coumarin derivative dye sensitized NaYGdF4:Yb,Er nanoparticles with enhanced NIR Ⅱ luminescence for bio-vascular imaging

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2023年第12期41卷 1843-1849,I0001页

作者： Yaqun Ma Zhan wang Yanxing wang Zhenghao Liu yukun wang Ruichan Lv Xi'an Key Laboratory of Intelligent Sensing and Regulation of Trans-Scale Life Information Engineering Research Center of Molecular and Neuro ImagingMinistry of EducationSchool of Life Science and TechnologyXidian UniversityXi'an710071China

Lanthanide-doped biocompatible nanoparticles have promising applications in near-infrared second region imaging due to their high chemical stability,enhanced photostability and sharp emission ***,the weak light absorption capacity limits the application of rare-earth nanoparticles(RENPs) for *** prepared a coumarin-derived dye sensitized NaYGdF4:Yb,Er nanoparticle probe,in which the organic dye enhances photon absorption through the sensitization process,improving the luminescence efficiency of the rare earth particles near 1000 and 1500 *** addition,good water solubility and stability of the probe are imparted by coating the particles with amphiphilic polymers distearoyl phosphatidylethanolamine-polyethylene glycol(DSPE-PEG) and polyacrylic *** composite probe with good biocompatibility and NIR Ⅱ luminescence properties can be used for vascular imaging,providing a tool for the detection of hematologic-related diseases.

关键词： Rare earth doped nanoparticles Dye sensitization NIR imaging Angiography

Simulation study of the purification system for indoor oil mist control in machining factories

在线全文

学校读者我要写书评

暂无评论

Building Simulation 2023年第8期16卷 1361-1374页

作者： yukun wang Yu Guo Wenjia Hao Wei Liu Zhengwei Long Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityWeijin Road 92Tianjin 300072China Division of Sustainable Buildings Department of Civil and ArchitecturalEngineeringKTH Royal Institute of TechnologyBrinellvägen 23Stockholm10044Sweden

High-concentration oil mists can cause serious health problems to workers,which are generally mitigated by ventilation and purification ***,the coupling relationship between these systems is not *** this study,the effects of purifier outlet direction,purification air volume,installation height,and purification efficiency on indoor oil mist distribution were investigated by numerical simulation using an actual machining *** mitigation of oil mist in various combinations of ventilation and purification systems was also *** results show that the outlet direction of the purifier has a great influence on the distribution of oil mist in the factory,and the maximum difference of oil mist concentration in the breathing zone under different orientations is 17%.The best purifier outlet direction is vertically *** the purifier outlet direction is upward,a larger purification air volume is beneficial for contaminant removal,and a lower purifier exhaust installation height is helpful for oil mist discharge from the bottom of the factory and reducing the concentration of oil mist in the breathing *** oil mist concentration of purifier exhaust increases from 0 to 2 mg/m^(3) and the oil mist concentration in the breathing zone increases by 67%.The combined system of purification system with the roof exhaust system and displacement ventilation system has the optimal pollution removal efficiency and the lowest concentration of oil mist in the breathing zone compared to other *** research results can provide a reference for the design,installation,and operation of ventilation and purification systems in machining factories.

关键词： oil particulate matter purification system ventilation system indoor air quality CFD

Design and Analysis of New Modular Stator Hybrid Excitation Synchronous Motor

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CES Transactions on Electrical Machines and Systems 2022年第2期6卷 188-194页

作者： Shengnan Wu yukun wang Wenming Tong School of Electrical Engineering Shenyang University of TechnologyShenyang 110870China National Engineering Research Center for Rare Earth Permanent Magnet Machines Shenyang University of TechnologyShenyang 110870China

Hybrid excitation motor is a combination of permanent magnet motor and electric excitation motor,which can flexibly adjust the air gap magnetic *** present,the traditional silicon steel sheet core material is widely used,but this material limits the further reduction of stator iron *** this paper,a new type of hybrid excitation synchronous motor with modular stator structure based on amorphous alloy material is *** design power is 1kW,and the speed is *** placing the armature winding and electric excitation winding in the stator slot,the slip ring and brush are avoided,and the reliability of the motor is *** rotor adopts staggered magnetic pole structure,which has strong flux adjusting *** core loss is greatly reduced by using amorphous ***,the structure and working principle of the new motor are given;Secondly,the size parameters of the motor are given,and the principle of flux adjustment is verified and analyzed by three-dimensional finite element(3D-FEM);Finally,through theoretical analysis of the influence factors of the magnetic adjustment ability and 3D-FEM finite element computation,the flux adjustment ability and the torque lifting at low speed are verified,and the advantages of the motor are verified.

关键词： hybrid excitation synchronous machine 3D-FEM Amorphous alloy stator core

Optimizing impedance matching by a dual-carbon Co-regulation strategy of Co_(3)O_(4)@rGO/celery stalks derived carbon composites for excellent microwave absorption

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第2期133卷 1-11页

作者： Xiubo Xie yukun wang Xueqin Sun Heshan wang Ronghai Yu Wei Du Hongjing Wu School of Environmental and Material Engineering Yantai UniversityYantai 264005China MOE Key Laboratory of Material Physics and Chemistry under Extraordinary School of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing 100191China

Both macroscopic composition and microstructure should be considered for reasonable microwave ab-sorbent *** this study,Co_(3)O_(4)@reduced graphene oxide(rGO)/Celery stalks derived carbon(CDC)was prepared by loading Co_(3)O_(4) particles into rGO and biomass-derived carbon mixture through oxidation *** changing the mass ratio of rGO to CDC,the dielectric and impedance matching proper-ties of the composites can be easily *** RL min value of Co_(3)O_(4)@rGO/CDC_(13) composite(weight ratio for rGO:CDC is 1:3)reaches-84.3 dB with a thickness of 4.6 mm,and the widest effective band-width can be obtained at 4.5 GHz with a matching thickness of 2.8 *** Co_(3)O_(4)@rGO/CDC_(13) compos-ite with multiple components(Co_(3)O_(4),CDC,rGO)and 3D net structure produces magnetic/dielectric loss combinations,interfacial polarization,and multiple reflections and scattering,and the CDC with half tube and half sheet structure is conducive to the optimization of impedance *** strategy of co-regulating dielectric properties of materials with double carbon provides a novel pathway for the prepa-ration of lightweight,low-cost,and high-performance absorbers.

关键词： Microwave absorption Graphene Co_(3)O_(4) Biomass carbon Impedance matching

On Temperature Soft Sensor Model of Rotary Kiln Burning Zone Based on RS-LSSVM 36

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

On Temperature Soft Sensor Model of Rotary Kiln Burning Zone...

Study of the multi-physics field-coupled model of the two-stage electrostatic precipitator

第36届中国控制会议

作者： yukun wang Xuebo Chen School of Chemical Engineering University of Science and Technology Liaoning School of Electronic and Information Engineering University of Science and Technology Liaoning

ISBN: (纸本)9781538629185

The Burning Zone temperature of rotary kiln has the characteristics of strong coupling,nonlinearity and large delay,it is difficult to detect the temperature stability and *** on knowledge reduction ability of rough set and nonlinear adaptive ability of support vector machines（SVM）,a burning zone temperature soft sensor model based on RS-LSSVM is proposed and applied in the rotary kiln sintering ***,the global discretization method is used to deal with the historical sample data and the rough sets theory is applied to attribute ***,LSSVM model is built with the reduction set which reflect the sample data features,and the Immune evolutionary algorithm（IEA） is used to optimize the parameters of the RS-LSSVM ***,the simulation results show that the accuracy of the soft sensor model is better than LSSVM model,and the anti-interference ability is strong,and it can meet the requirements of the burning zone temperature detection of the rotary kiln.

关键词： Burning zone temperature Rough sets Global discretization method LSSVM IEA

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Building Simulation 2024年第3期17卷 387-398页

作者： Wenjia Hao Yu Guo yukun wang Tao Yu Hao Gao Zhengwei Long Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityWeijin Road 92Tianjin300072China Wuhan Second Ship Design and Research Institute WuhanChin

The two-stage electrostatic precipitator is widely used to purify oil mist ***,there is limited research on the influences of relative humidity,particle deposition characteristics,and the generation of gaseous ***,this paper established a numerical model of the electrostatic oil mist purifier and applied it to a two-stage electrostatic *** the model was used to investigate the corona discharge characteristics under different relative humidity conditions in the charged zone,the particle deposition characteristics,the purification efficiency,the ozone concentration distribution,and the oil vapor concentration distribution in the collection *** results indicate that,with a constant temperature,the corona current decreases as relative humidity increase,and there is a quadratic relationship between relative humidity and *** variation in relative humidity has little impact on the purification *** maximum ozone concentration occurs near the electrode line,and its concentration is influenced by the discharge current and inlet airflow *** oil vapor concentration reaches its maximum value at the side plates,with a value of 19 ppb,while it reaches the minimum value at the collecting zone electrode plate,with a value of 2 *** temperature is the main factor affecting the volatilization of the oil film,with higher temperatures resulting in higher oil vapor.

关键词： two-stage ESPs particle deposition corona discharge oil vapor

Multi-sensor multispectral reconstruction framework based on projection and reconstruction

维普期刊数据库评论

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(Information Sciences) 2024年第3期67卷 246-262页

作者： Tianshuai LI Tianzhu LIU Xian LI Yanfeng GU yukun wang Yushi CHEN School of Electronics and Information Engineering Harbin Institute of Technology Heilongjiang Province Key Laboratory of Space-Air-Ground Integrated Intelligent Remote Sensing

The scarcity and low spatial resolution of hyperspectral images(HSIs) have become a major problem limiting the application of the images. In recent years, spectral reconstruction(SR) has been applied to convert multispectral images(MSIs) with abundant quantities and high spatial resolution into HSIs. With the launch of several new multispectral(MS) satellites with a short repeat period, the simultaneous acquisition of images from multiple MS sensors in the same area is gradually becoming feasible. Unfortunately, existing SR methods only consider the reconstruction of the MSIs of a single sensor without considering using MSIs from different MS sensors to obtain a better construction effect through their complementary bands. However,multi-sensor SR is characterized by two problems: inconsistency in the amplitude information of real multisensor imaging and difficulty in the extraction of the complex correlations of bands from different *** solve these problems, this paper proposes a multi-sensor SR framework based on a two-step approach in which the problems of amplitude inconsistency and band information extraction are solved using an ideal projection network and an ideal multi-sensor SR network, respectively. The effectiveness of the proposed method is verified by experiments on three datasets.

关键词： spectral reconstruction spectral superresolution hyperspectral image multispectral image neural networks multi-sensor

同方期刊数据库

Stable isotopic composition of otoliths in identification of stock structure of small yellow croaker(Larimichthys polyactis) in China

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2016年第6期35卷 29-33页

作者： wang yukun HUANG Jiansheng TANG Xuexi JIN Xianshi SUN Yao Yellow Sea Fisheries Research Institute Chinese Academy of Fishery Sciences Laboratory of Ecology College of Marine Life SciencesOcean University of China

Oxygen and carbon isotope ratios（δ^（18）O and δ^（13）C） in otoliths were used to identify the stock structure of small yellow croaker,Larimichthys *** were collected from fish at five locations across the Yellow Sea and the Bohai Sea representing most of their distributional range and fisheries *** significant differences in the isotopic signatures showed that the five locations could be chemically distinguished and clearly separated,indicating stock *** of δ^（18）O and δ^（13）C values suggested that population of *** could be divided into the Bohai Sea group,the southern Yellow Sea group and the central Yellow Sea *** analysis of δ^（18）O and δ^（13）C values demonstrated a high significant difference with 85.7% classification *** spatial separation of *** indicated a complex stock structure across the Yellow Sea and the Bohai *** results indicate that optimal fisheries management may require a comprehensive consideration on the current spatial *** study has provided further evidence that measurement of the stable isotopes ratios in otolith can be a valuable tool in the delineation of fishery management units.

关键词： small yellow croaker otolith stable isotope chemistry stock structure

Determination of trophic levels of marine fish in the Yellow Sea and northern East China Sea using nitrogen stable isotope (δ^(15)N) analysis of otoliths

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2022年第2期40卷 634-642页

作者： Huaiyu BAI yukun wang Tingting ZHANG Fangqun DAI Lingfeng HUANG Yao SUN College of the Environment and Ecology Xiamen UniversityXiamen 361102China Yellow Sea Fisheries Research Institute Chinese Academy of Fishery SciencesQingdao 266071China Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems Xiamen UniversityXiamen 361005China Laboratory for Marine Fisheries Science and Food Production Processes Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266071China

Fish otolithδ^(15) N(δ^(15) N_(oto))is a demonstrated source of information of dietary history for marine fi sh as it is available iN_(oto)lith archives and sedimentary deposits unlike white muscle tissue(WMT).WMT and stomach content data are insufficient for trophic level(TL)data of past fi shes which is important for the changes of marine fi shery resources over long time *** determine the correlation betweenδ^(15) N_(oto) and fi sh WMTδ^(15) N(δ^(15) N_(wmt))and the feasibility of usingδ^(15) N_(oto) in characterizing the TLs of marine fi shes,we conducted nitrogen stable isotope analysis(SIA)in the otolith and WMT of 36 marine fi sh species sampled from the Yellow Sea and northern East China Sea in ***δ^(15) N_(oto) andδ^(15) N_(wmt) were analyzed using an elemental analyzer coupled with an isotope ratio mass spectrometer(EA-IRMS).Multiple otoliths were combined to make each otolith measurement and were analyzed as-is without a carbonate dissolution pre-processing step.δ^(15) N_(oto) andδ^(15) N_(wmt) comparisons for species in the Yellow Sea and northern East China Sea are currently lacking and would be helpful for both regional studies and for increasing the number of species for whichδ^(15) N_(oto) andδ^(15) N_(wmt) have been ***,to determine the relative accuracy of trophic level calculated usingδ^(15) N_(oto),we compared TL calculated fromδ^(15) N_(oto) to traditional trophic level metrics calculated usingδ^(15) N_(wmt).The results showed a positive and highly signifi cant correlation(R=0.780,P<0.001)betweenδ^(15) N_(oto) andδ^(15) N_(wmt).Trophic level estimation using WMT(TL wmt)and otolith(TL oto)showed congruence in our study,which is not entirely surprising given thatδ^(15) N_(oto) was regressed againstδ^(15) N_(wmt) and the resulting regression coefficient was used to convertδ^(15) N_(oto) toδ^(15) N_(wmt) prior to calculating TL *** conversion was required in order to be consistent with previousδ^(15) N_(wmt)-b

关键词： stable isotope analysis δ^(15)N otolith trophic level