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Theoretical and experimental investigation on novel 2D maglev servo proportional valve

Chinese Journal of Aeronautics 2021年第4期34卷 416-431页

作者： Bin MENG Hao XU Jian ruan Sheng LI Key Laboratory of Special Purpose Equipment and Advanced Manufacturing Technology Ministry of Education Zhejiang University of TechnologyHangzhou 310018China

This paper presents a novel two-dimensional maglev servo proportional cartridge valve(2 D maglev valve),where a contactless maglev coupling is introduced between electro-mechanical converter and valve body to realize functions of force transmission,spool position feedback and linear-rotary motion *** configuration can effectively reduce cost of both valve manufacturing and electro-mechanical converter,while still maintain features of 2 D valve such as null pilot leakage,high power-to-weight ratio and excellent anti-pollution ***,the characteristic equation of the valve is derived using linear theory,and the stability criterion is established for parameter *** influences of crucial structural parameters such as initial height of overlapping area,width of high-pressure and low-pressure holes,acting radius of magnetic force,pitch angle of maglev coupling,length of sensitive chamber and system pressure on the dynamic response are investigated based on AMESim numerical *** prototype valve is then designed and manufactured and a special test rig is *** no-load flow characteristic,load flow characteristic,leakage characteristic,amplitude and phase frequency characteristics and step response under different system pressures are *** experimental results are in a good agreement with the simulated *** an over-damped system,the prototype valve has excellent working stability,which can reach a no-load flow rate of 105.9 L/min with hysteresis of 3.51%,amplitude bandwidth of 28.7 Hz and phase bandwidth of 42.8 Hz under 21 *** research indicates that the 2 D maglev valve can be a potential solution of flow rate control valve for flight control surface system of civil aircraft with high pressure and large flow rate application.

关键词： Dynamic characteristic 2D valve Maglev coupling Servo proportional valve Stability criterion

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Multifunctional Ti_(3)C_(2)T_(x)-(Fe_(3)O_(4)/polyimide)composite films with Janus structure for outstanding electromagnetic interference shielding and superior visual thermal management

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Nano Research 2022年第6期15卷 5601-5609页

作者： Yali Zhang Zhonglei Ma Kunpeng ruan Junwei Gu Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Flexible multifunctional polymer-based electromagnetic interference(EMI)shielding composite films have important application values in the fields of 5G communication technology,wearable electronic devices and artificial *** this work,Fe_(3)O_(4)/polyamic acid(PAA)nanofiber films are prepared by in-situ polymerization and electrospinning technology,and Ti_(3)C_(2)T_(x)nanosheets are deposited on the surface of the Fe_(3)O_(4)/PAA nanofiber films via vacuum-assisted ***,Janus Ti_(3)C_(2)T_(x)-(Fe_(3)O_(4)/polyimide(PI))composite films are obtained by thermal *** two sides of the Janus films exhibit completely different *** Fe_(3)O_(4)/PI side has excellent hydrophobicity and insulation property,and the Ti_(3)C_(2)T_(x)side has hydrophilicity and terrific *** the mass fraction of Ti_(3)C_(2)T_(x)is 80 wt.%,the Janus Ti_(3)C_(2)T_(x)-(Fe_(3)O_(4)/PI)composite film has excellent EMI shielding performances and mechanical properties,with EMI shielding effectiveness,tensile strength and Young’s modulus reaching 66 dB,114.5 MPa and 5.8 GPa,*** the same time,electromagnetic waves show different absorption shielding effectiveness(SEA)when incident from two sides of the Janus *** the electromagnetic waves are incident from the Fe_(3)O_(4)/PI side,the SEA of the Janus film is 58 dB,much higher than that when the electromagnetic waves are incident from the Ti_(3)C_(2)T_(x)side(39 dB).In addition,the Ti_(3)C_(2)T_(x)side of the Janus Ti_(3)C_(2)T_(x)-(Fe_(3)O_(4)/PI)composite films also has excellent electrothermal and photothermal conversion *** the applied voltage is 4 V,the stable surface temperature reaches 108°C;when it is irradiated by simulated sunlight with power density of 200 mW/cm2,the stable surface temperature reaches 95℃.

关键词： Janus structure Ti_(3)C_(2)T_(x)-(Fe_(3)O_(4)/PI)composite films electromagnetic interference shielding electrothermal conversion photothermal conversion

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The Enhanced Electrons and Holes Separation for Bi_(2)MoO_(6)/Ag/TiO_(2)Z-scheme Heterojunction by Ag Loading

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Journal of Wuhan University of Technology(Materials Science) 2023年第5期38卷 996-1002页

作者： ruan Chenliang WANG Wei DAI Zhenxiang ZHENG Ganhong School of Physics and Materials Science Anhui UniversityHefei 230039China School of Physics and Optoeletronics Engineering Anhui UniversityHefei 230039China

The Bi_(2)MoO_(6)/TiO_(2)and Bi_(2)MoO_(6)/Ag/TiO_(2)composites were solvothermally synthesized and characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and(high resolution)transmission electron microscopy((HR)TEM).The Bi_(2)MoO_(6)/TiO_(2)and Bi_(2)MoO_(6)/Ag/TiO_(2)composites exhibited higher photocatalytic activity than pure Bi_(2)MoO_(6).100%of the Rh B dye molecules could be decomposed over Bi_(2)MoO_(6)/Ag/TiO_(2)composite in 120 *** enhanced photocatalytic activity of Bi_(2)MoO_(6)/TiO_(2)and Bi_(2)MoO_(6)/Ag/TiO_(2)composite was attributed to the efficient separation of photoinduced electrons and *** mechanism for the enhanced photocatalytic activity is discussed.

关键词： photocatalysis Ag heterojunction Bi_(2)MoO_(6)/Ag/TiO_(2) photocatalytic activity

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Gradient Estimates for a Nonlinear Diffusion Equation on Complete Manifolds

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Chinese Annals of Mathematics,Series B 2015年第6期36卷 1011-1018页

作者： Jiaxian WU Qihua ruan Yihu YANG School of Mathematics and Statistics Nanjing University of Information Science & Technology Department of Mathematics Putian University Department of Mathematics Shanghai Jiao Tong University

This paper deals with the gradient estimates of the Hamilton type for the positive solutions to the following nonlinear diffusion equation：on a complete noncompact Riemannian manifold with a Bakry-Emery Ricci curvature bounded below by -K （K 〉 0）, where φ is a C2 function, a（x） and b（x） are C1 functions with certain conditions.

关键词： Gradient estimate Bakry-Emery Ricci curvature Nonlinear diffusion equation 58J35

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Black phosphorus quantum dots induce myocardial inflammatory responses and metabolic disorders in mice

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Journal of Environmental Sciences 2024年第3期137卷 53-64页

作者： Chao Shen Xiaoyan Ding Jinpeng ruan Fengkai ruan Weiping Hu Jiyi Huang Chengyong He Yi Yu Zhenghong Zuo Department of Nephrology State Key Laboratory of Cellular Stress BiologySchool of Life SciencesFaculty of Medicine and Life SciencesFujian Clinical Research Center for Chronic Glomerular DiseaseThe First Affiliated Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamen 361102China

As an ultrasmall derivative of black phosphorus(BP)sheets,BP quantum dots(BP-QDs)have been effectively used in many ***,information on the cardiotoxicity induced by BP-QDs remains *** aimed to evaluate BP-QD-induced cardiac toxicity in *** examination of heart tissue sections was *** sequencing,real-time quantitative PCR(RT–qPCR),western blotting,and enzyme-linked immunosorbent assay(ELISA)assays were used to detect the m RNA and/or protein expression of proinfammatory cytokines,nuclear factor kappa B(NF-κB),phosphatidylinositol3 kinase-protein kinase B(PI3K-AKT),peroxisome proliferator-activated receptor gamma(PPARγ),and glucose/lipid metabolism pathway-related *** found that heart weight and heart/body weight index(HBI)were significantly reduced in mice after intragastric administration of 0.1 or 1 mg/kg BP-QDs for 28 *** addition,obvious infammatory cell infiltration and increased cardiomyocyte diameter were observed in the BP-QD-treated *** expression of proinfammatory cytokines and genes related to the NF-κB signaling pathway further confirmed that BP-QD exposure induced infammatory *** addition,BP-QD treatment also affected the PI3K-AKT,PPARγ,thermogenesis,oxidative phosphorylation,and cardiac muscle contraction signaling *** expression of genes related to glucose/lipid metabolism signaling pathways was dramatically affected by BP-QD exposure,and the effect was primarily mediated by the PPAR signaling *** study provides new insights into the toxicity of BP-QDs to human health.

关键词： BP-QDs Cardiac toxicity Infammatory responses NF-κB signaling pathway PPARγsignaling pathway Glucose/lipid metabolism

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Seasonal variations and environmental controls on stalagmite calcite crystal growth in Heshang Cave,central China

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Chinese Science Bulletin 2010年第34期55卷 3929-3935页

作者： ruan JiaoYang HU ChaoYong Key Laboratory of Biogeology and Environmental Geology of the Ministry of Education (China University of Geosciences) Wuhan 430074China

Stalagmite growth rates are usually considered to reflect changes in paleoclimate and ***,how exactly growth rates are affected by climate and environment is still *** launched a monitoring and modeling program that lasted approximately 4 years on two active drip sites in Heshang Cave,central *** collected comprehensive quantitative data on growth rates,cave temperature,CO2 concentration,drip rate and drip-water chemistry to better understand the relationship between stalagmite growth and cave *** laying out glass substrates,we successfully grew stalagmite calcite crystals with rhombic characteristics,and quantified growth rates by measuring the long and short axes of calcite crystals under a *** with coeval environmental data,we explicitly examined the roles of cave temperature,drip rate and drip-water chemistry in controlling the micro-scale growth of stalagmite *** show that growth of stalagmite calcite crystals at two drip sites exhibited similar seasonal variations - generally faster in the summer months,at ～3 μm d-1,and slower during the late winter to early spring,at ～1.5 μm *** in calcite growth rates were mainly determined by changes in cave temperature,with the growth rate increasing by 8.1%/°C and 6.6%/°C at the two *** indicates the potential use of stalagmite growth rates as a seasonal-resolution paleo-temperature proxy in some ventilated *** the other hand,the effect of drip rate and drip-water Ca2+ and SIC values on growth rates were not significant.

关键词：方解石晶体洞穴石笋环境控制晶体生长季节变化中国二氧化碳浓度增长率

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“Excessive muscle strain as the direct cause of injury” should not be generalized to hamstring muscle strain injury in sprinting

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Journal of Sport and Health Science 2018年第1期7卷 123-124页

作者： Mianfang ruan Faculty of Physical Education Ningbo University

The debate about the mechanisms of hamstring injuries in sprinting in the Journal of Sport and Health Science reminded me of the discussion of the force enhancement mechanisms in stretch-shortening cycles(SSCs)20 years ago in the Journal of Applied *** controversies concerning the proposed mechanisms were mainly due to the difference in

关键词：损害肌肉原因杂志机制

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Public perception of electric vehicles on reddit over the past decade

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Communications in Transportation Research 2022年第1期2卷 181-192页

作者： Tao ruan Qin Lv Department of Computer Science University of Colorado Boulder430 UCBBoulderCO80309USA

Understanding public perception of electric vehicles(EVs)is imperative for increasing EV adoption,which can significantly reduce greenhouse gas(GHG)emissions,thereby mitigating climate change and global *** most existing research characterizes public perception of EV in the context of surveys,questionnaires,or interviews,our study leverages Reddit online social network(OSN)data to capture EV public perception at a much larger *** have collected 3,437,917 Reddit posts(including 274,979 submissions and 3,162,938 comments)between January 2011 and December 2020 relevant to EVs and analyzed them along several axes to understand how EVs are perceived by the public on Reddit through the following research questions:(1)What EVrelated topics have been discussed by Reddit users?Whether/how Reddit users’interest in different topics has changed during 2011–2020?(2)What sentiment do Reddit users hold towards EVs?Whether public sentiment on Reddit has shifted over the past 10 years?(3)Whether/how do various Reddit communities(i.e.,subreddits)have different perceptions of EVs?Our analysis evinces the potential of utilizing a large-scale OSN dataset for demonstrating a much wider spectrum of topics that the public is interested in than previous studies show,reveals fringe communities including r/conspiracy have many(controversial)discussions on EVs,especially on the environmental impacts of EVs,and one political community(r/The_Donald)has similar patterns with fringe communities in both sentiment and topic *** answering these research questions,we aim to develop a more comprehensive understanding of the public perception of EVs in the past decade.

关键词： Reddit Electric vehicles Public perception Online social network Topic modeling Sentiment analysis

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Inspection of reinforced concrete interface delamination using ultrasonic guided wave non-destructive test technique

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Science China(Technological Sciences) 2012年第10期55卷 2893-2901页

作者： LI DongSheng ruan Tao YUAN JunHui State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

An ultrasonic-guided wave(UGW) is a very promising tool in the field of structural health monitoring and non-destructive *** analysis was used to simulate the propagation in the rebar and explore the characteristics of UGW in the steel rebar ***-dimensional fast Fourier transform was used to process the numerical results and to evaluate the ***,different UGW test influence factors were *** results clearly showed that both the group velocity and the amplitude of longitudinal modes were not very sensitive to stress and temperature ***,the received UGW signal energy decreased with the increasing concrete ***,the interface condition between the concrete and the rebar was ***-domain and frequency-domain analyses were used to process the received *** interface delamination lengths of the UGW energy attenuation were analyzed and a relationship was *** study successfully proved that UGW is an effective tool in the non-destructive test of reinforced concrete interface delamination.

关键词： ultrasonic guided waves reinforced concrete interface delamination structural health monitoring

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Current status of FAP-directed cancer theranostics:a bibliometric analysis

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Biophysics Reports 2024年第6期10卷 388-402页

作者： Dan ruan Simin Wu Xuehua Lin Liang Zhao jiayu Cai Weizhi Xu Yizhen Pang Qiang Xie Xiaobo Qu Haojun Chen Department of Nuclear Medicine and Minnan PET Center Xiamen Key Laboratory of Development and Translation of Radiopharmaceuticals the First Affiliated Hospital of Xiamen University School of Medicine Xiamen University National Institute for Data Science in Health and Medicine Department of Electronic Science Intelligent Medical Imaging R & D Center Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance Xiamen University Department of Cardiology the First Affiliated Hospital of Xiamen University School of Medicine Xiamen University Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth Materials Haixi Institute Chinese Academy of Sciences

Fibroblast activation protein（FAP） is a key molecule in the field of oncology, with significant impacts on tumor diagnosis and treatment. Importantly, it has paved the way for the development of radiotracers for quinoline-based FAP inhibitors（FAPIs）, which are currently among the most promising radiotracers for PET imaging in cancer. We performed a bibliometric analysis of scientific publications related to FAP and FAPI-based radiotracers, which included the quantification and visualization of current research trends and prospects based on various bibliometric indicators. In our survey of FAP-related studies in the Web of Science Core Collection databases, R and VOSviewer were used for visualization and bibliometric analyses based on country, institute, author, journal, and keywords. We also examined the methodology, radionuclide type, imaging instruments, and major diseases associated with studies on FAPI-based radiotracers. The results revealed 2,664 FAP-related publications from 1992 to the present. Germany, the USA, and China dominated paper publications, multinational collaborations,and societal impacts on FAP research. Southwest Medical University was the most productive institute,while Haberkorn Uwe authored the most cited papers and the highest H-index. The European Journal of Nuclear Medicine and Molecular Imaging and the Journal of Nuclear Medicine were the most influential periodicals. Keywords "FAP", "68Ga-FAPI", and "PET/CT" emerged as the most significant in this *** study may help elucidate current research trends, hotspots, and directions for future research.

关键词： Cancer FAPI Fibroblast activation protein PET/CT Radionuclide Bibliometric analysis

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