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A new technique for deriving the quiet day curve from imaging riometer data at Zhongshan Station, Antarctic

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Science China(Technological Sciences) 2014年第10期57卷 1967-1976页

作者： HE Fang HU HongQiao HU ZeJun liu ruiyuan SOA Key Laboratory for Polar Science Polar Research Institute of China Key Laboratory of Ionospheric Environment Institute of Geology and Geophysics Chinese Academy of Sciences

A new technique for estimating quiet day curve(QDC)was *** validate the new approach,QDCs were derived from data acquired by the imaging riometer installed at the Chinese Zhongshan Station in *** evaluation was performed by comparing the difference between QDC derived by the new technique and those derived by Tanaka’s *** results were discussed in terms of the diurnal variation and ***,cosmic noise absorption(CNA)images were built using both techniques in order to evaluate the implications of the changes when obtaining them using different methods of the QDC *** influence of the multiplicative factor value on the QDC determination in Tanaka’s technique was evaluated.

关键词： riometer absorption technique

Delivery systems for theranostics in neurodegenerative diseases

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Nano Research 2018年第10期11卷 5535-5555页

作者： Yan Li ruiyuan liu Weihong Ji Yanhui Li Linying liu Xin Zhang State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

Neurodegenerative diseases are characterized by progressive nervous system dysfunction, which affects over 90,000 people every year. Although numerous contrast agents and therapeutic drugs are available for the diagnosis and therapy of neurodegenerative diseases, there are several limitations to their application. Particularly, these contrast agents and drugs are restricted from entering into the brain because of the blood-brain barrier, which represents a major bottleneck to efficacious and safe theranostics of neurodegenerative diseases. Nanoparticles can offer impressive improvement in the theranostics of neurodegenerative diseases, as they can effectively deliver contrast agents and drugs to target sites in the central nervous system. In this review, we describe various delivery systems, including lipid nanoparticles, polymeric nanoparticles, inorganic nanoparticles, and exosomes useful for the theranostics of neurodegenerative diseases. Finally, we outline current challenges and our perspectives on the development of delivery systems for theranostics of neurodegenerative diseases.

关键词： neurodegenerative diseases theranostics blood-brain barrier delivery systems

Continuous Tera-Hertz wave transmission spectroscopy of Nb double superconducting split-ring resonator array

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Science China(Physics,Mechanics & Astronomy) 2012年第2期55卷 224-227页

作者： ZUO JunWei liu ruiyuan ZHOU YuRong LI YanRong WANG YunPing Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesP.O.Box 603Beijing 100190China

Transmission spectroscopy of two Nb double superconducting split-ring samples with different thicknesses on MgO substrates was measured by a continuous Tera-Hertz *** transmission curves of two different samples with the thicknesses of 50 and 150 nm at 7.5 K show dips at 480,545 GHz,respectively,which origin from the different capacities and inductances of the *** the sample of 50 nm,the dip shifts to lower frequency,also decreases in depth and increases in width with temperature or field increasing below T c of Nb film,while the sample of 150 nm does not show such a *** thickness-dependent transmission behavior is due to the kinetic inductance and conductivity change of superfluid electrons in Nb film and may suggest a practical tunable THz filter based on the thinner samples.

关键词： Tera-Hertz spectroscopy superconductor split-ring resonator

Shape and magnetic moment dependence of the dipolar field in Mn_(12)-acetate

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Science China(Physics,Mechanics & Astronomy) 2010年第8期53卷 1568-1570页

作者： ZHOU YuRong LI YanRong ZUO JunWei liu ruiyuan WANG YunPing Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

There is a small fraction of fast-relaxation species in Mn12-acetate, which is utilized to determine the dipolar field of Mn12. Here we report an easier way to precisely obtain the dipolar field by measuring the M-H curves above the blocking temperature of fastrelaxation species. We found that there is a simple linear relationship between the magnetic moment and dipolar field; besides the dipolar field is also dependent on the sample shape, which is consistent with the numerical calculation.

关键词： molecular magnet quantum tunneling dipolar field magnetic relaxation

Pressure-induced changes in the magnetic properties of the single crystal of Mn_3 single-molecule magnet

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Science China(Physics,Mechanics & Astronomy) 2014年第7期57卷 1299-1303页

作者： CUI Yan WU Yue LI YanRong liu ruiyuan DONG XiaoLi WANG YunPing Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences

The magnetic measurements of the single crystal of Mn3 single-molecule magnet under high pressure at T=2 K have been *** find both the antiferromagnetic intermolecular coupling parameter J and the effective energy barrier to vary compared with the measurements at low *** increase of|J|is estimated to be 12%at 0.7 GPa when compared with that of0 GPa,whereas the effective energy barrier becomes smaller with increasing *** results demonstrate that the intermolecular interaction of single-molecule magnet can be changed by *** with the normal magnetic alloy,the effect of pressure on the magnetic properties of Mn3 is much more prominent,which implies that Mn3 may have great potential in magnetic multifunctional material.

关键词： single-molecule magnet exchange coupling quantum tunneling of magnetization quasi-hydrostatic pressure

Application of autocorrelation method on ionospheric short--term forecasting in China

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Chinese Science Bulletin 2006年第3期51卷 352-357页

作者： liu ruiyuan liu Shunlin XU Zhonghua WU Jian WANG Xianyi ZHANG Beichen HU Hongqiao School of Electronic Information of Wuhan University Wuhan 430072 China Polar Research Institute of China Shanghai 200136 China China Research Institute of Radiowave Propagation Xinxiang 453003 China

Adopting the autocorrelation method in the ionospheric short-term forecasting, we put for- ward a simple and practical forecasting method― the sectional autocorrelation method, that is, for pre- dictions of one hour to four hours ahead the auto- correlation coefficient of RDF with the “iteration” method is selected, for prediction of more than four hours ahead, the autocorrelation coefficient of f0F2 with the “at once” method is used. The prediction precisions have been quantitatively estimated based on the data from Chongqing and Guangzhou Ionos- onde Stations. It is shown that the method is much improved for the predictions of one hour to four hours ahead. For the predictions of more than four hours ahead the prediction error reaches a saturation value, which is still lower than that of the “median” method. This new method could also be applied to the short-term forecasting of other ionospheric parame- ters.

关键词：电离层电离层预报自相关法短期预报中国

Volatile organic compounds concentration profiles and control strategy in container manufacturing industry:Case studies in China

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Journal of Environmental Sciences 2021年第6期33卷 296-306页

作者： Yunting Ke ruiyuan liu Xiaofang Chen Yang Feng Ping Gao Haomin Huang Liya Fan Daiqi Ye School of Environment and Energy South China University of TechnologyGuangzhou 510006China Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control(SCUT) Guangzhou 510006China National Engineering Laboratory for VOCs Pollution Control Technology and Equipment(SCUT) Guangzhou 510006China Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal(SCUT) Guangzhou 510006China

Volatile organic compounds(VOCs),important precursors of ozone(O_(3))and fine particulate matter(PM_(2.5)),are the key to curb the momentum of O_(3)growth and further reducing PM_(2.5)in *** manufacturing industry is one of the major VOC emitters,and more than 96%containers of the world are produced in China,with the annual usage of coatings of over 200,000 tons in recent *** is the first research on the emission characteristics of VOCs in Chinese container manufacturing industry,including concentration and ozone formation potential(OFP)of each *** result shows that the largest amounts of VOCs are emitted during the pretreatment process,followed by the paint mixing process and primer painting process,and finally other sprays *** average VOC concentrations in the workshops,the exhausts before treatment and the exhausts after treatment are ranging from 82.67–797.46,170–1,812.65,66.20–349.63 mg/m^(3),***,alcohols and ethers are main species,which contribute more than 90%OFP *** on the emission characteristics of VOCs and the technical feasibility,it is recommended to set the emission limit in standard of benzene to 1.0 mg/m^(3),toluene to 10 mg/m^(3),xylene to 20 mg/m^(3),benzenes to 40 mg/m^(3),alcohols and ethers to 50 mg/m^(3),and VOCs to 100 mg/m^(3).The study reports the industry emission characteristics and discusses the standard limits,which is a powerful support to promote VOCs emission reduction,and to promote the coordinated control of PM_(2.5)and O_(3)pollution.

关键词： Container manufacturing Volatile organic compounds(VOCs) Emission characteristics Control strategy

Frequency-domain terahertz transmission spectra of Mn_3 and Mn_(12) single-molecule magnets

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Science China(Physics,Mechanics & Astronomy) 2012年第7期55卷 1245-1248页

作者： liu ruiyuan ZUO JunWei LI YanRong ZHOU YuRong WANG YunPing Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesP.O.Box 603Beijing 100190China

Frequency-domain terahertz transmission spectra of Mn3 and Mn12 single molecule magnets （SMMs） have been measured at different temperatures, and hence the anisotropic parameters O2 and D4 of the spin Hamiltonian H = D2Sz^2 ＋ D4Sz^4 have been calculated. For Mn12 SMM, D2=-10.9 GHz and D4=-2.59×10^-2 GHz, while for Mn3 SMM, D2=-22.0 GHz and D4 can be con- sidered negligible. This suggests Mn3 SMM can be considered as a simpler and more suitable candidate for magnetic quantum tunneling research.

关键词： terahertz single-molecule magnets transmission

SuperDARN CUTLASS Finland radar observations of high-latitude magnetic reconnections under northward interplanetary magnetic field (IMF) conditions

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Science China(Technological Sciences) 2012年第5期55卷 1207-1216页

作者： ZHANG QingHe liu ruiyuan YANG HuiGen HU HongQiao ZHANG BeiChen DUNLOP Malcolm LESTER Mark BOGDANOVA Yulia WALSH Andrew SOA Key Laboratoryfor Polar Science Polar Research Institute of ChinaShanghai 200136China Space Science Department Rutherford-Appleton LaboratoryChiltonDidcotUK Department of Physics and Astronomy University of LeicesterLeicesterUK Mullard Space Science Laboratory University College LondonDorkingSurreyUK

A number of backscatter power enhancement events with ＂equatorward-moving radar auroral forms＂ in the high-latitude ionosphere were observed by SuperDARN CUTLASS Finland radar when the IMF was northward during 09：00 -10：00 UT on 26 March 2004. These events were also associated with sunward flow enhancements at each location in the Northern Hemisphere which were shown in ionospheric convections measured by the SuperDARN radars. These are typical features of high-latitude （lobe） magnetic reconnections. The durations of the velocity enhancements imply that the evolution time of the lobe reconnec- tions is about 8-16 rain from their origin at the reconnection site to their addition to the magnetotall lobe again. In additional, the Double Star TC-1 spacecraft was moving from magnetosheath into magnetosphere, and crossing the magnetopause near the subsolar region during this interval, and observed typical low-latitude magnetic reconnection signatures. This infers that the dayside high- and low-latitude reconnections may occur simultaneously.

关键词： high-latitude magnetic reconnection equatorward-moving radar auroral form evolution time of the lobe reconnections