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Optimal selection of tests for fault detection and isolation in multi-operating mode system

Journal of Systems Engineering and Electronics 2019年第2期30卷 425-434页

作者： liu yuanhong School of Equipment Engineering Armed Police Force Engineering University

The complex systems are often in the structure of multi-operating modes, and the components implementing system functions are different under different operation modes, which results in the problems that components often fail in different operating modes, faults can be only detected in specified operating modes, tests can be available in specified operating modes,and the cost and efficiency of detecting and isolating faults are different under different operating modes and isolation levels. Aiming at these problems, an optimal test selection method for fault detection and isolation in the multi-operating mode system is proposed by using the fault pair coding and rollout algorithm. Firstly,the faults in fault-test correlation matrices under different operating modes are combined to fault-pairs, which is used to construct the fault pair-test correlation matrices under different operating ***, the final fault pair-test correlation matrix of the multioperating mode system is obtained by operating the fault pair-test correlation matrices under different operating modes. Based on the final fault pair-test correlation matrix, the necessary tests are selected by the rollout algorithm orderly. Finally, the effectiveness of the proposed method is verified by examples of the optimal test selection in the multi-operating mode system with faults isolated to different levels. The result shows that the proposed method can effectively mine the fault detection and isolation ability of tests and it is suitable for the optimal test selection of the multi-operating mode system with faults isolated to the replacement unit and specific fault.

关键词： operating mode test optimization fault pair coding fault detection fault isolation

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Nickel-Catalyzed Direct Coupling of Allylic Alcohols with Organoboron Reagents

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Chinese Journal of Chemistry 2018年第10期36卷 916-920页

作者： Gaonan Wang Yi Gan yuanhong liu State Key Laboratory of Organometallic Chemistry Center for Excellence in Molecular Synthesis Shanghai Institute of Organic Chemistry Univer- sity of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Lu Shanghai 200032 China

The direct coupling of allylic alcohols with arylboronic acids or their derivatives catalyzed by Ni（cod）2 in the presence of a catalytic amount of base has been developed. A wide variety of allylic substrates or aryIboronic acids turned out to be applicable to this catalytic system. The present method does not require the use of ligands for stabilizing the nickel catalyst in most cases or additional activators for activation of altylic alcohols.

关键词： nickel catalysis cross-coupling allylic alcohols arylboronic acids allylation C--C coupling

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Enhanced luminescence performances of Mn^(4+)-activated Sr_(4)Al_(14)O_(25)red phosphors by doping with Sc^(3+)ions

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Journal of Rare Earths 2021年第4期39卷 380-385页

作者： Lin Luo Ronghui liu yuanhong liu Weidong Zhuang Yanfeng Li Shaowei Qin National Engineering Research Center for Rare Earth Materials GR1NM Group Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co. LtdBeijing 100088China General Research Institute for Nonferrous Metals.Beijing 100088 China

A series of non-rare earth Mn^(4+)-activated strontium aluminate phosphors Sr_(4)Al_(14)O_(25):Mn^(4+)co-doped with Sc^(3+)ions were successfully synthesized by a high-temperature solid-state reaction *** result reveals that there is no introduction of additional phase but expansion of lattice with incorporation of Sc34 *** and emission spectrum measurement shows that the synthesized phosphors can be efficiently excited by near-ultraviolet and blue light,and a deep red emission centered at 652 nm with a narrow full width at half maximum(FWHM)can be obtained,which is attributed to the transition^(2)E→^(4)A_(2)of Mn^(4+)*** addition,the crystal field strength parameter(Dq)and Racah parameters(B,C)and energies of states were calculated based on experimental ***,the luminous intensity of Sr_(4)Al_(14-x)SCxO_(25):Mn^(4+)is enhanced and increased by 60%compared with Mn^(4+)single incorporated sample at x=0.06.A phenomenon of redshift is observed in the excitation spectrum and discussed ***,the mechanism of the positive effects with Sc^(3+)ions incorporated into lattice is discussed in *** the results suggest that the Sr_(4)Al_(13.94)Sc_(0.06)O_(25):Mn^(4+)phosphor will become one of the great candidates for backlight of LCD.

关键词： Red phosphors Backlight Luminescence Mn^(4+) Rare earths

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Green and red phosphor for LED backlight in wide color gamut LCD

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Journal of Rare Earths 2020年第1期38卷 1-12页

作者： Yunpeng Zhang Lin Luo Guantong Chen yuanhong liu Ronghui liu Xiaochun Chen Beijing University of Chemical Technology Beijing 100029China National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous MetalsGrirem Advanced Materials Co.Ltd.Beijing 100088China

Wide color gamut(WCG) backlight for liquid crystal display(LCD) utilizing white light-emitting diodes(LED) has attracted considerable attention for their high efficiency and color *** this review,recent developments in crystal structure,luminescence and applications of phosphors for wide color gamut LED backlight are *** novel red phosphors,Mn4+activate fluoride and aluminate phosphors are advanced in quantum efficiency,thermal quenching and color saturation for their characteristic spectrum with broad excitation band and linear *** crystal structure and fluorescence properties of Mn4+doped fluosilicate,fluorogermanate,fluotitanate,as well as Sr4 Al14O25,CaAl12O19 and BaMgAl10O17 phosphors are discussed in detail.A serial of narrow-band red-emitting Eu2+,Eu3+and Pr3+-doped nitride silicates and molybdate phosphors are also ***-earth-doped oxynitride and silicate green-emitting phosphors have attracted more and more attention because of the wide excitation,narrow emission,high quenching temperature,high quantum efficiency,such as β-sialon:Eu2+,Ba3Si6O12N2:Eu2+,MSi2O2N2:Eu2+(M=Ca,Sr,Ba),y-AlON:Mn2+and Ca3Sc2Si3O12:Ce3+.All above phosphors demonstrate their adaptability in wide color gamut LCD *** for Mn4+doped fluosilicate red phosphor and β-sialon:Eu2+green *** achieve an ultra-high color gamut in white LED backlight and against the OLED,innovative narrow-band-emission red and green phosphor materials with independent intellectual property rights are continuously pursed.

关键词： Wide color gamut Backlight Liquid crystal display Phosphor White LED Rare earths

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Nickel-Catalyzed Cross-Coupling of Aryl Pivalates with Cyclobutanols Involving C-O and C-C Bond Cleavage

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Chinese Journal of Chemistry 2020年第12期38卷 1686-1690页

作者： Yi Gan Ninghui Zhang Shaoxu Huang yuanhong liu State Key Laboratory of organometallic Chemistry Center for Excellence in Molecular Synthesisshanghai lnstitute of organic ChemistryUniversity of Chinese Academy of SciencesChinese Acodemy of Sciences345 Lingling LuShanghai 200032China Department of Chemistry Zhengzhou University100 Science AvenueZhengzhouHenan 450001China

of main observation and conclusion An efficient nickel-catalyzed cross-coupling of aryl pivalates with cyclobutanols is *** use of Ni(cod)2/PCy3/base as the catalytic system enables the cleavage of inert C—0 bond and C—C bond under mild conditions,thus providing a facile access to y-arylated ketones in generally good to excellent *** transformation is also characterized by wide substrate scope and functional group compatibility,for example,methoxy,γ-dimethylamino,keto,ester,fluoro and TMS groups are well-tolerated during the reaction process.

关键词： process. nickel conclusion

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Design of luminescence in(Sr,Gd)Li(Al,Mg)_(3)N_(4):Eu^(2+)deep red phosphors via crystal field engineering for full-spectrum WLEDs

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Journal of Rare Earths 2023年第8期41卷 1127-1134,I0001页

作者： Qing Lin Tongyu Gao yuanhong liu Ronghui liu Siwei Chen Xiaole Ma Chunlei Zhao National Engineering Research Center for Rare Earth GRINM Group Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China

Red phosphor,with longer wavelength,is highly desirable for full-spectrum *** deep red phosphors(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+)were designed from the initial model of SrLiAl_(3)N_(4):Eu^(2+)by structural *** correlations among structural evolution,crystal-field environment,and luminescence properties were *** Sr^(2+)with Gd^(3+)in(Sr,Gd)LiAl_(3)N_(4):Eu^(2+)leads to the enhanced crystal field splitting,larger Stokes shift,and increased structural polyhedron distortion differences,consequently resulting in spectral red-shift and *** further spectral tuning,Mg,with lower electronegativity,was also introduced to modify the local crystal structure,consequently resulting in a further red-shift towards 675 nm and enhanced photoluminescence intensity in(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+).What’s more,w-LEDs were fabricated by using blue LED chip,blue,green,red and deep red((Sr,Gd)Li(Al,Mg)_(3)N_(4):Eu^(2+))phosphors whose color rendering index were Ra 96.0 and *** above results demonstrate that the partial replacements of Sr^(2+)by Gd^(3+)and Al^(3+)by Mg^(2+)are effective methods for spectral modulation and(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+)phosphors are suitable for highquality full-spectrum WLEDs.

关键词： Full-spectrum WLEDs Structural modulation Deep red phosphor Rare earths

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Synthesis, structure and luminescent properties of yellow phosphor La3Si6N11 ：Ce^3＋ for high power white-LEDs

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Journal of Rare Earths 2017年第11期35卷 1059-1064页

作者： Fu Du Weidong Zhuang Ronghui liu yuanhong liu Wei Gao Xia Zhang Yuan Xue Hongrui Hao National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Grirem Advanced Materials Co. Ltd.Beijing 100088 China

A series of high phase purity blue light excitable yellow-emitting LaSiN:xCephosphors were synthesized by the high temperature solid state reactions method. The structure and luminescent properties were investigated. The phase structure was studied by means of X-ray diffraction, structures refinements and energy dispersive X-ray spectroscopy. The phosphors effectively excited by the light of450 nm and show intense yellow emission at 535 nm with FWHM of 115 nm corresponding to the5 d →~2 Fand 5 d →~2 Ftransitions of Ce. In addition,the optimized LaSiN:0.14 Ceexhibits a weak thermal quenching, which remains 98.2% of the initial emission intensity when heated to 200 ℃,the thermal quenching properties exhibit a modest decline when the temperature returned to room temperature. The above results indicate that LaSiN:Cecan be regarded as a high promising phosphor for applications in high power white-light LED.

关键词： High phase purity La_3Si_6N_(11):Ce^(3+) Small thermal quenching High power white-light LED

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Photoluminescent properties of tunable green-emitting oxynitride （Baa-xSrx）Si6012N2 ：Eu2＋ phosphor and its application in white LEDs

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Journal of Rare Earths 2013年第10期31卷 944-949页

作者： Guantong CHEN (陈观通) Weidong ZHUANG (庄卫东) Ronghui liu (刘荣辉) yuanhong liu (刘元红) Yunsheng HU (胡运生) Huaqiang HE (何华强) National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Grirem Advanced Materials Co. Ltd. Beijing 100088 China

Green emitting Eu2＋-doped （Ba3_xSrx）Si6012N2 solid solutions were synthesized through solid state reaction at 1350 ℃ for 10 h under a N2/H2 atmosphere. The XRD patterns revealed that the solid solution series of （Ba3 x-ySrx）Si6Ol2N2：yEu2＋ with x value ranging from 0-0.6 were established. An efficient and intense tunable green light was observed by varying the cation Sr/Ba ratio. The emission spectra exhibited an entire shift towards long wavelength with increasing ofx value, which was caused by large crystal field splitting and Stokes shift. The x value dependence of emission intensity was discovered and explained by the enhanced probability of electron from excited 4f state to 5d ground state via nonradioactive transition. Highly thermal stability and feasible color coordinates were verified. White LEDs with excellent photochromic properties were fabricated by packing GaN based blue chips and （Ba Sr）3Si6012N2：Eu2＋ phosphors. All results indicated that the （Ba3_xSrx）SirO12N2：Eu2＋ phosphors were confirmed to be a promising candidate for pc-white LEDs in solid state lighting.

关键词： oxynitride phosphor solid solution white LEDs rare earths

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Effect of fluxes on synthesis and luminescence properties of BaSi_2O_2N_2:Eu^(2+) oxynitride phosphors

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Journal of Rare Earths 2018年第3期36卷 225-230页

作者： Jiansheng Huang Ronghui liu yuanhong liu Yunshen Hu Guantong Chen Chunpei Yan Junhang Tian Bin Hu National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Grirem Advanced Materials Co. Ltd.

Eu^2＋ activated BaSi2 O2 N2 oxynitride bluish-green phosphor was synthesized adopting conventional high-temperature solid-state reaction method, in which BaF2, Na2 CO3 and NH4 Cl were used as the *** phase formation, size distribution and microscopic morphology were characterized to investigate the influence of adding fluxes on photo luminescence properties. The results indicate that with the addition of BaF2 flux, the particle morphology becomes regular and size distribution narrows and the phase purity of BaSi2 O2 N2：Eu^2＋ phosphor can be improved effectively. The photoluminescence intensity of BaSi2 O2 N2：Eu^2＋ phosphor with BaF2 as flux gets enhanced obviously, which is much higher than that of Na2 CO3, NH4 Cl and without flux. The optimum content of BaF2 flux is 4 wt%, and the maximum photoluminescence intensity of the BaSi2 O2 N2：Eu^2＋ phosphor prepared with BaF2 flux rises to 141%,meanwhile, the phosphors with BaF2 flux exhibits low thermal quenching. The results indicate that the BaSi2 O2 N2：Eu^2＋ is sort of promising bluish-green phosphor for application in full-spectra LED.

关键词： BaSi2O2N2 Oxynitride phosphor Flux Thermal stability Rare earths

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Broadband near-infrared luminescence and energy transfer of Cr^(3+),Ce^(3+) co-doped Ca_(2)LuHf_(2)Al_(3)O_(12) phosphors

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Journal of Rare Earths 2021年第3期39卷 269-276,I0002页

作者： Jinpin Wu Weidong Zhuang Ronghui liu yuanhong liu Tongyu Gao Chunpei Yan Min Cao Junhang Tian Xiaoxia Chen National Engineering Research Center for Rare Earth Materials GRINM Croup Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices School of ChemistryBiology and Materials ScienceEast China University of TechnologyNanchang 330046China

Broadband near-infrared phosphors are highly desirable for food *** Ca_(2)LuHf_(2)Al_(3)O_(12):Cr^(3+)(CLHA:Cr^(3+)) and Ca_(2)LuHf_(2)Al_(3)O_(12):Ce^(3+),Cr^(3+)(CLHA:Ce^(3+),Cr^(^(3+))) phosphors were synthesized by the conventional high-temperature solid state *** CLHA:Cr^(3+)phosphor,with a good thermal stability,shows a red shift owing to radiation reabsorption and non-radiative transition with increasing Cr^(3+)*** co-doped sample,the emission intensity of Cr^(3+)can be enhanced by three times due to the energy transfer from Ce^(3+)to Cr^(3+),which can be evidenced by a significant overlap between the PLE of Cr^(3+)single-doped phosphor and the PL of Ce^(3+)single-doped *** addition,the mechanism of energy transfer is identified as a quadrupole-quadrupole interaction according to decay Lifetime and Dexter’s energy transfer *** broadband NIR emission peaked at 775 nm of CLHA:Cr^(3+),Ce^(3+)phosphor shows a bright prospect in nondestructive quality-control analysis systems for food.

关键词： Broadband near-infrared Energy transfer Garnet phosphor Rare earths

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