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Green Vertical‑Cavity Surface‑Emitting Lasers Based on InGaN Quantum Dots and Short Cavity

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Nano-Micro Letters 2023年第12期15卷 115-125页

作者： Tao Yang Yan‑Hui Chen Ya‑Chao Wang Wei Ou Lei‑Ying Ying Yang Mei Ai‑Qin Tian jian‑ping liu Hao‑Chung Guo Bao‑ping Zhang Laboratory of Micro/Nano‑Optoelectronics School of Electronic Science and EngineeringXiamen UniversityXiamen 361005FujianPeople’s Republic of China Suzhou Institute of Nano‑Tech and Nano‑Bionics Chinese Academy of SciencesSuzhou 215123JiangsuPeople’s Republic of China Department of Photonics National Yang Ming Chiao Tung UniversityHsinchu 30010TaiwanPeople’s Republic of China Semiconductor Research Center Honhai Research InstituteNew Taipei 220236TaiwanPeople’s Republic of China

Room temperature low threshold lasing of green GaNbased vertical cavity surface emitting laser(VCSEL)was demonstrated under continuous wave(CW)operation.By using self-formed InGaN quantum dots(QDs)as the active region,the VCSEL emitting at 524.0 nm has a threshold current density of 51.97 A cm^(-2),the lowest ever reported.The QD epitaxial wafer featured with a high IQE of 69.94%and theδ-function-like density of states plays an important role in achieving low threshold current.Besides,a short cavity of the device(~4.0λ)is vital to enhance the spontaneous emission coupling factor to 0.094,increase the gain coefficient factor,and decrease the optical loss.To improve heat dissipation,AlN layer was used as the current confinement layer and electroplated copper plate was used to replace metal bonding.The results provide important guidance to achieving high performance GaN-based VCSELs.

关键词： Green vertical cavity surface emitting laser GaN Low threshold InGaN quantum dots

Copolymerization of(10-oxo-10-hydro-9-oxa-10λ~5-phospha-phenanthrene-10-yl)-methyl acrylate with styrene

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Chinese Chemical Letters 2009年第7期20卷 881-884页

作者： Li Yan jian ping liu Nan Zhen Yu Bin Zheng Department of Polymer Material Dalian University of Technology Dalian 116012 China College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325027 China

A phosphorus-containing monomer （lO-oxo-10-hydro-9-oxa-10λ^5-phosphaphenanthrene-10-yl）-methyl acrylate （MD was copolymerized with styrene to give a potential flame retardant copolymer of high thermal stability. The structures of monomer and copolymer were characterized by FT-IR and ^1H NMR measurements. The reactivity ratios for free-radical of the monomer （M1） and styrene （Mz） were studied. The calculated results are as follows： r1 = 0.225, r2 = 0.503; Q1 = 0.413, e1 = 0.476; azeotropic point = 0.37. TGA and DTG curves indicated that Ml is a potential flame retarding monomer for styrenic polymers. C 2009 Yu Bin Zheng. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Flame retardant Copolymerization Phosphorus-containing monomer Styrene

Visual function and higher order aberration after implantation of aspheric and spherical multifocal intraocular lenses:a meta-analysis

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International Journal of Ophthalmology(English edition) 2013年第5期6卷 690-695页

作者： jian-ping liu Fan Zhang jiang-Yue Zhao Li-Wei Ma Jin-Song Zhang Department of Ophthalmology the Fourth Affiliated Hospital of China Medical University Eye Hospital of China Medical University Key Lens Research Laboratory of Liaoning Province

AIMTo assess the visual outcomes of aspheric multifocal intraocular lenses (IOLs) compared with spherical multifocal IOL after cataract surgery.

关键词： aspheric multifocal intraocular lens uncorrected near visual acuity uncorrected distance visual acuity spherical multifocal intraocular lens higher order aberration meta-analysis

A new fast heat treatment process for cast A356 alloy motorcycle wheel hubs

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China Foundry 2018年第1期15卷 11-16页

作者： Shi-ping Lu Rui Du jian-ping liu Lin-can Chen Shu-sen Wu Zhejiang Wanfeng Motorcycle Wheel Co. Ltd. Xinchang 312500. Zhejiang. China State Key Lab of Materials Processing and Die &Mould Technology Huazhong University of Science and Technology Wuhan 430074 China

The normal T6 heat treatment process for cast A356 alloy generally requires about 15 h. This longperiod procedure increases greatly the manufacturing cost and decreases the productivity in practical production. In this study, a new short-time heat treatment process with only 30 min solution time at 540℃ was developed for the production of motorcycle wheel hubs in order to reduce heat treatment time. Comparisons on microstructure evaluation and mechanical properties, such as tensile strength and ductility, were made between this new fast process and the conventional T6 heat treatment. The results revealed that this new heat treatment process enabled the spheroidization of the eutectic silicon thoroughly, while minimizing the growth of eutectic silicon. The A356 alloy after this new short-time heat treatment shows nearly equal mechanical properties compared with the same alloy heat treated in a normal T6 heat treatment. This investigation makes it possible to significantly improve the efficiency of heat treatment on A356 alloy and, at the same time, improve the mechanical properties of the alloy.

关键词： A356 alloy short-time heat treatment microstructure evaluation mechanical properties

Precision measurement of the Newtonian gravitational constant

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National Science Review 2020年第12期7卷 1803-1817页

作者： Chao Xue jian-ping liu Qing Li Jun-Fei Wu Shan-Qing Yang Qi liu Cheng-Gang Shao Liang-Cheng Tu Zhong-Kun Hu Jun Luo Tian Qin Research Center for Gravitational Physics & School of Physics and Astronomy Sun Yat-sen University(Zhuhai Campus) MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of PhysicsHuazhong University of Science and Technology

The Newtonian gravitational constant G,which is one of the most important fundamental physical constants in nature,plays a significant role in the fields of theoretical physics,geophysics,astrophysics and astronomy.Although G was the first physical constant to be introduced in the history of science,it is considered to be one of the most difficult to measure accurately so far.Over the past two decades,eleven precision measurements of the gravitational constant have been performed,and the latest recommended value for G published by the Committee on Data for Science and Technology(CODATA) is(6.674 08 ±0.000 31) × 10m~3 kgswith a relative uncertainty of 47 parts per million.This uncertainty is the smallest compared with previous CODATA recommended values of G;however,it remains a relatively large uncertainty among other fundamental physical constants.In this paper we briefly review the history of the G measurement,and introduce eleven values of G adopted in CODATA 2014 after 2000 and our latest two values published in 2018 using two independent methods.

关键词： precision measurement Newtonian gravitational constant CODATA

Direct synthesis of nitriles by Cu/DMEDA/TEMPO-catalyzed aerobic oxidation of primary amines with air

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Chinese Chemical Letters 2017年第6期28卷 1336-1339页

作者： Xian-Tao Ma Hao Xu Ying-Lin Xiao Chen-Liang Su jian-ping liu Qing Xu SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Optoelectronic EngineeringShenzhen University College of Chemistry and Materials Engineering Department Wenzhou University

By screening the copper catalysts,ligands,and the reaction conditions,a simple CuCl/DMEDA/TEMPO catalyst system readily available from commercial sources is developed for a direct and selective synthesis of the useful nitriles by an aerobic oxidation reaction of primary amines using air as an advantageous oxidant under mild conditions.

关键词： Aerobic oxidation Air Amines Copper catalysis Nitriles

Releasing of Cupric Ion of Three types of Copper-bearing Intrauterine Contraceptive Device in Simulated UterineFluid

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Journal of Reproduction and Contraception 2007年第1期18卷 33-39页

作者： Jie GAO Ying LI jian-ping liu Xuan GU Pharmaceutic Institute of China Pharmaceutical University Nanjing 210009 China Institute of Planned Parenthood Research of jiangsu Province Nanjing 210036 China

Objective To compare the cupric ion releasing in vitro o.f the three IUDs. Methods The stability o.f cupric ion releasing o.f IUDs including TCu 380.4 IUD （TCu 380A）, Multiload Cu375 IUD （MCu 375） and Yuangong 365 copper-bearing indomethacin-releasing IUD （Yuangong 365） by the determination of cupric ion releasing in simulated uterine fluid. The simulated uterine fluid was used for releasing media. Copper ion was determined by flame atomic absorption spectrometer. Results The cupric ion releasing of three IUDs were instable at the beginning and tend to be stable gradually. In the stable phase, the average level of cupric ion releasing of TCu380A, MCu375 and Yuangong 365 were 4.25±2.71-7.62±6.42 μg, 4.92±1.23 -8.62±3.08 μg and 2.19±0.40-4.68±1.66 μg, respectively. TCu380A had higher instable releasing level than those of Yuangong 365 （P〈0. 05）. Conclusion TCu 380.4 and MCu 375 showed a ＂burst release＂ during the first few days and the.former was of great significance（P〈0.05）. The initial cupric ion releasing of Yuangong 365 appeared to be the lowest, followed by MCu375 and TCu380A in a releasing order

关键词： copper-bearing intrauterine contraceptive device Cu-IUD the releasing ofcupric ion simulated uterine fluid flame atomic absorption spectrometer

Freeze-dried Si-Ni-San powder can ameliorate high fat diet-induced non-alcoholic fatty liver disease

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World Journal of Gastroenterology 2019年第24期25卷 3056-3068页

作者： Feng Zhu Yong-Min Li Ting-Ting Feng Yue Wu Hai-Xia Zhang Guo-Yin Jin jian-ping liu Department of Traditional Chinese Medicine Hebei North UniversityZhangjiakou 075000Hebei ProvinceChina Department of Gastroenterology People’s Hospital of Changshou DistrictChongqing 401220China

BACKGROUND Non-alcoholic fatty liver disease(NAFLD)is a common chronic liver disease worldwide.However,to date,there is no ideal therapy for this disease.AIM To study the effects of Si-Ni-San freeze-dried powder on high fat diet-induced NAFLD in mice.METHODS Twenty-four male C57BL/6 mice were randomized into three groups of eight.The control group(CON)was allowed ad libitum access to a normal chow diet.The high fat diet group(FAT)and Si-Ni-San group(SNS)were allowed ad libitum access to a high fat diet.The SNS group was intragastrically administered Si-Ni-San freeze-dried powder(5.0 g/kg)once daily,and the CON and FAT groups were intragastrically administered distilled water.After 12 wk,body weight,liver index,visceral fat index,serum alanine aminotransferase(ALT),portal lipopoly-saccharide(LPS),liver tumor necrosis factor(TNF)-αand liver triglycerides were measured.Intestinal microbiota were analyzed using a 16S r DNA sequencing technique.RESULTS Compared with the FAT group,the SNS group exhibited decreased body weight,liver index,visceral fat index,serum ALT,portal LPS,liver TNF-αand liver triglycerides(P<0.05).Intestinal microbiota analysis showed that the SNS group had different bacterial composition and function compared with the FAT group.In particular,Oscillospira genus was a bacterial biomarker of SNS group samples.CONCLUSION The beneficial effects of Si-Ni-San freeze-dried powder on high fat diet-induced NAFLD in mice may be associated with its anti-inflammatory and changing intestinal microbiota effects.

关键词： Nonalcoholic fatty liver disease Si-Ni-San High fat diet Intestinal microbiota Inflammation

Egg recognition abilities of tit species in the Paridae family:do Indomalayan tits exhibit higher recognition than Palearctic tits?

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Zoological Research 2020年第6期41卷 726-732页

作者： jian-ping liu Lei Zhang Li Zhang Can-Chao Yang Cheng-Te Yao Xin Lu Anders Pape Moller Dong-Mei Wan Wei Liang Ministry of Education Key Laboratory for Ecology of Tropical Islands College of Life SciencesHainan Normal UniversityHaikouHainan 571158China Key Laboratory of Animal Resource and Epidemic Disease Prevention College of Life SciencesLiaoning UniversityShenyangLiaoning 110036China High Altitude Experimental Station Taiwan Endemic Species Research InstituteNantouTaiwan 55244China Department of Ecology College of Life SciencesWuhan UniversityWuhanHubei 430072China Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering College of Life SciencesBeijing Normal UniversityBeijing 100875China Ecologie Systématique Evolution UniversitéParis-SudCNRSAgroParisTechUniversitéParis-SaclayOrsay Cedex F-91405France

DEAR EDITOR,Recent studies have shown that the closely related cinereous tit(Parus cinereus)and green-backed tit(P.monticolus)in China display strong egg recognition ability in contrast to tit species in Europe,which lack such ability.However,egg recognition in other populations of cinereous and greenbacked tits and additional Paridae species still requires further research.

关键词： recognition tit family