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Driving forces behind the spatiotemporal heterogeneity of land-use and land-cover change:A case study of the Weihe River Basin,China

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Journal of Arid Land 2023年第3期15卷 253-273页

作者： WU Jingyan LUO Jungang ZHANG Han yu mengjie State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi'an University of TechnologyXi'an 710048China

The impact of socioeconomic development on land-use and land-cover change(LUCC)in river basins varies spatially and *** the spatiotemporal evolutionary trends and drivers of LUCC under regional disparities is the basis for the sustainable development and management of *** this study,the Weihe River Basin(WRB)in China was selected as a typical basin,and the WRB was divided into the upstream of the Weihe River Basin(UWRB),the midstream of the Weihe River Basin(MWRB),the downstream of the Weihe River Basin(DWRB),the Jinghe River Basin(JRB),and the Luohe River Basin(LRB).Based on land-use data(cultivated land,forestland,grassland,built-up land,bare land,and water body)from 1985 to 2020,we analyzed the spatiotemporal heterogeneity of LUCC in the WRB using a land-use transfer matrix and a dynamic change *** driving forces of LUCC in the WRB in different periods were detected using the GeoDetector,and the selected influencing factors included meteorological factors(precipitation and temperature),natural factors(elevation,slope,soil,and distance to rivers),social factors(distance to national highway,distance to railway,distance to provincial highway,and distance to expressway),and human activity factors(population density and gross domestic product(GDP)).The results indicated that the types and intensities of LUCC conversions showed considerable disparities across different sub-basins,where complex conversions among cultivated land,forestland,and grassland occurred in the LRB,JRB,and UWRB,with higher dynamic change before *** conversion of other land-use types to built-up land was concentrated in the UWRB,MWRB,and DWRB,with substantial increases after ***,the driving effects of the influencing factors on LUCC in each sub-basin also exhibited distinct diversity,with the LRB and JRB being influenced by the meteorological and social factors,and the UWRB,MWRB,and DWRB being driven by human activity ***,the interaction

关键词： land-use and land-cover change(LUCC) spatial heterogeneity land-use conversion dynamic change model GeoDetector human activities Weihe River Basin

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Interview with light-wave architect Jelena Vuckovic

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Advanced Photonics 2024年第4期6卷 9-13页

作者： mengjie yu Jelena Vuckovic University of Southern California Viterbi School of EngineeringDepartment of Electrical and Computer EngineeringLos AngelesCaliforniaUnited States Stanford University the National Academy of Sciences the Nanoscale and Quantum Photonics Lab in the Ginzton Laboratory

mengjie yu:Hello,*** interview is organized by the journal Advanced *** today we're really honored and privileged to have Professor Jelena Vuckovic from Stanford University here with us.I'm from University of Southern... 详细信息

关键词： wave interview light

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Raman lasing and soliton mode-locking in lithium niobate microresonators

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Light(Science & Applications) 2020年第1期9卷 1925-1931页

作者： mengjie yu Yoshitomo Okawachi Rebecca Cheng Cheng Wang Mian Zhang Alexander L.Gaeta Marko Loncar Department John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA Department of Applied Physics and Applied Mathematics Columbia UniversityNew YorkNY 10027USA Department of Electronic Engineering&State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong KongChina HyperLight Corporation 501 Massachusetts AvenueCambridgeMA 02139USA

The recent advancement in lithium-niobite-on-insulator(LNOI)technology is opening up new opportunities in optoelectronics,as devices with better performance,lower power consumption and a smaller footprint can be realised due to the high optical confinement in the *** LNOI platform offers both largeχ(2)andχ(3)nonlinearities along with the power of dispersion engineering,enabling brand new nonlinear photonic devices and applications for the next generation of integrated photonic ***,Raman scattering and its interaction with other nonlinear processes have not been extensively studied in dispersion-engineered LNOI *** this work,we characterise the Raman radiation spectra in a monolithic lithium niobate(LN)microresonator via selective excitation of Raman-active phonon *** dominant mode for the Raman oscillation is observed in the backward direction for a continuous-wave pump threshold power of 20mW with a high differential quantum efficiency of 46%.We explore the effects of Raman scattering on Kerr optical frequency comb *** achieve mode-locked states in an X-cut LNOI chip through sufficient suppression of the Raman effect via cavity geometry *** analysis of the Raman effect provides guidance for the development of future chip-based photonic devices on the LNOI platform.

关键词： scattering pump lithium

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Optical Microresonators feature issue introduction

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Photonics Research 2023年第12期11卷 I0001-I0003页

作者： yuN-FENG XIAO KARTIK SRINIVASAN PASCAL DEL’HAYE mengjie yu Frontiers Science Center for Nano-optoelectronics and State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Microsystems and Nanotechnology Division Physical Measurement LaboratoryNational Institute of Standards and TechnologyGaithersburgMaryland 20899USA Max Planck Institute for the Science of Light 91058 ErlangenGermany Ming Hsieh Department of Electrical and Computer Engineering University of Southern CaliforniaLos AngelesCalifornia 90089USA

Optical microresonators,which confine light in both the spatial and time domains,have advanced various research areas benefiting from significantly enhanced light-matter interactions,including integrated microlasers,nonlinear frequency conversion,Kerr frequency combs,and *** the past five years,the research interests in optical microresonators have rapidly expanded and combined with other disciplines,for example,optical chaos,non-Hermitian physics,and quantum *** cutting-edge research works have enabled the creation of optical microresonators with novel properties and capabilities.

关键词： materials chaos expanded

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Spectral control of nonclassical light pulses using an integrated thin-film lithium niobate modulator

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Light(Science & Applications) 2022年第12期11卷 2922-2930页

作者： Di Zhu Changchen Chen mengjie yu Linbo Shao Yaowen Hu CJXin Matthew Yeh Soumya Ghosh Lingyan He Christian Reimer Neil Sinclair Franco N.C.Wong Mian Zhang Marko Loncar John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A*STAR)Singapore 138634Singapore Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMA 02139USA HyperLight Corporation 1 Bow StreetSuite 420CambridgeMA 02139USA Division of Physics Mathematics and Astronomyand Alliance for Quantum Technologies(AQT)California Institute of TechnologyPasadenaCA 91125USA

Manipulating the frequency and bandwidth of nonclassical light is essential for implementing frequency-encoded/multiplexed quantum computation,communication,and networking protocols,and for bridging spectral mismatch among various quantum ***,quantum spectral control requires a strong nonlinearity mediated by light,microwave,or acoustics,which is challenging to realize with high efficiency,low noise,and on an integrated ***,we demonstrate both frequency shifting and bandwidth compression of heralded single-photon pulses using an integrated thin-film lithium niobate(TFLN)phase *** achieve record-high electro-optic frequency shearing of telecom single photons over terahertz range(±641 GHz or±5.2 nm),enabling high visibility quantum interference between frequency-nondegenerate photon *** further operate the modulator as a time lens and demonstrate over eighteen-fold(6.55 nm to 0.35 nm)bandwidth compression of single *** results showcase the viability and promise of on-chip quantum spectral control for scalable photonic quantum information processing.

关键词： quantum lithium film

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Thyroid Hormone Biomonitoring:A Review on Their Metabolism and Machine-Learning Based Analysis on Effects of Endocrine Disrupting Chemicals

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Environment & Health 2024年第6期2卷 350-372页

作者： Shijie Chen mengjie yu Yiming Yao Yongcheng Li Ana He Zijun Zhou Liyang Pan Nan Xiao Haining Luo Hongwen Sun MOE Key Laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and EngineeringNankai UniversityTianjin 300071China Tianjin Tianshi College Tianjin 301700China Dalian Center for Disease Control and Prevention DalianLiaoning Province 116000China Department of Center for Reproductive Medicine Tianjin Central Hospital Of Gynecology Obstetrics/Tianjin Key Laboratory Of Human Development And Reproductive RegulationTianjin 300052China

The thyroid is an essential endocrine organ in human body,and thyroid hormones(THs)are pivotal signaling molecules and mediators in various physiological ***,particularly in their free form,play a critical role in regulating body temperature and in the metabolism of lipid and glucose,making the maintenance of TH levels crucial for human *** undergo a series of metabolic processes,producing TH metabolites(THMs).THMs are significant in endocrine regulation,such as 3,5-diiothyronine(3,5-T2)and 3-iodothyronamine(3-T1AM),which exhibit activities akin to *** production and distribution of THMs are intricately linked to the function of specific organs and tissues,highlighting the need for advanced research into the determination and mechanisms of THMs in *** to endocrine disrupting chemicals(EDCs)can significantly affect the levels of thyroid stimulating hormone(TSH)and *** review utilizes machine learning to analyze epidemiological data,identifying potential EDCs that pose risks of hyperthyroidism and ***,it delves into the toxicological mechanisms of these EDCs,examining their effects on TH production,binding processes,related proteins,and metabolic *** approach effectively bridges the gap between epidemiological studies and toxicological researches,laying the groundwork for future research *** integrating epidemiological studies with machine learning,this review offers insightful perspectives on the potential risks associated with chemical exposure and underscores the necessity for further research in understanding the impact of EDCs on TH metabolism and TH-related health effects.

关键词： Thyroid stimulating hormone Emerging contaminants Data mining Thyroxine 3,3′,5-Triiodothyronine Homeostasis

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Contrastive Study on Content and Anti-oxidation Activity of Total Saponins from Cultivated and Wild Paris Plants in Southwest China

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Medicinal Plant 2017年第1期8卷 7-11页

作者： mengjie yu Haiyan XIANG Shaoshan ZHANG Zhongjie HUANG yuan LIU College of Pharmacy Southwest University for Nationalities Ethnic Medicine Institute Southwest University for Nationalities

[Objectives]To study content of total saponins from cultivated and wild Paris herbs in Southwest China,evaluate its in vitro antioxidation activity,and explore the correlation between quality of Paris herbs and production place,variety,cultivated and wild varieties.[Methods]Colorimetric method of perchloric acid reaction was used,and content of total saponins from Paris herbs was determined by ultraviolet spectrophotometer at 406 nm. [Results]The lowest content of total saponins from cultivated and wild Paris herbs in Southwest China was0. 55%,while the maximum was 12. 24%,with obvious difference. Total saponins from Paris herbs had stronger clearance ability on free radical DPPH and stronger reduction ability on Fe^(3+),and the results showed good dose-effect relationship with concentration. Among them,S6 had the highest clearance ability on DPPH,which reached 89. 66%. In the determination of reduction ability,the absorbance of S16 reached3. 643 and was the highest,with very good reducing property. Content and anti-oxidation capacity of total saponins from Paris herbs in Southwest China did not have obvious correlation with production place,altitude and cultivation but was related to variety. [Conclusions]The quality of Paris herbs in Southwest China was unstable,and their anti-oxidation abilities were also different,and cultivation could not guarantee high quality. It should normalize cultivation,and develop planting industry of Paris herbs,which could guarantee stable supply of Paris herbs and stability and controllability of quality.

关键词： Cultivated and wild Paris herbs UV-visible spectrophotometry Total saponins Anti-oxidation

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Determination of the Content of Total Saponins in Paris daliensis *** et V. G. Soukoup and Paris dulongensis H. Li et S. kurita

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Medicinal Plant 2017年第1期8卷 17-19页

作者： Zhongjie HUANG Haiyan XIANG Shaoshan ZHANG mengjie yu yuan LIU Hao ZHANG College of Pharmacy Southwest University for Nationalities Ethnic Medicine Institute Southwest University for Nationalities West China School of Pharmacy Sichuan University

[Objectives]To determine the content of total saponins in Paris daliensis H. Li et V. G. Soukoup and Paris dulongensis H. Li et ***,fill the gap in the study of Paris daliensis H. Li et V. G. Soukoup and Paris dulongensis H. Li et S. kurita,and lay a foundation for searching new medicinal resources of Paris L. [Methods]The perchloric acid colorimetric method and UV spectrophotometer were used to determine the content of total saponins in Paris daliensis H. Li et V. G. Soukoup and Paris dulongensis H. Li et S. kurita at 406 nm. [Results]The lowest content of total saponins in Paris daliensis H. Li et V. G. Soukoup was 2. 637%,while the highest content reached 5. 474%; the lowest content of total saponins in Paris dulongensis was 1. 806%,while the highest content reached 3. 532%. Through the methodological examination,it was found that this method was stable and reliable. [Conclusions] The content of total saponins was high in Paris daliensis *** et V. G. Soukoup and Paris dulongensis H. Li et S. kurita,and it was suggested to further study and find the medicinal resources of Paris L.

关键词： Paris daliensis H.Li et V.G.Soukoup Paris dulongensis H.Li et S.kurita UV spectrophotometry Total saponins Content de termination

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Are cities greener because of innovation?Independent innovation policy and green economic efficiency

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Chinese Journal of Population,Resources and Environment 2024年第2期22卷 118-126页

作者： Zhuoji Zheng Xueqin Li mengjie yu yuan Li Xianfeng Han yuping Yin School of Management Xiamen UniversityXiamen 361005China School of Applied Economics Renmin University of ChinaBeijing 100872China School of Economics Jinan UniversityGuangzhou 511436China School of Economics and Management Beijing University of TechnologyBeijing 100124China School of Management and Economics Kunming University of Science and TechnologyKunming 650500China

The national independent innovation demonstration zone(NIIDZ)is an independent innovation policy that plays a crucial role in implementing *** the importance of the NIIDZ,this study uses panel data of 278 prefecture-level cities in China from 2006 to 2020 and empirically examines the effect and internal mechanism of the NIIDZ on green economic efficiency(GEE)using the difference-in-difference model(DID).The results show that the NIIDZ effectively enhances the growth of GEE,and the results remain valid through several robustness tests,such as year-by-year propensity score *** transmission mechanism suggests that the NIIDZ indirectly drives GEE by accelerating scientific and technological investment,promoting talent concentration,and optimizing the industrial ***,heterogeneity analysis reveals that the promotion effect of the NIIDZ on GEE is more prominent in the eastern region and high green development level *** study’s findings can serve as a reference for China to further utilize the policy effectiveness of the NIIDZ and accelerate the high-quality development of the green economy in the future.

关键词： National innovation independent demonstration Zone(NIIDZ) Green economy efficiency(GEE) Difference-in-difference model(DID)

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民族区域自治制度的国际影响:学术争议、政策借鉴与理论反思

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广西民族研究 2021年第3期 1-8页

作者：田烨于梦杰兰州大学西北少数民族研究中心、历史文化学院甘肃兰州730000

我国采用民族区域自治制度解决我国的民族问题,体现鲜明的中国特色、中国气派、中国风格,产生了巨大的国际影响,引起了国外学界、政界的相关研究人员对我国民族区域自治制度的关注。一些国家的研究人员专程来我国了解和学习民族区域自... 详细信息

我国采用民族区域自治制度解决我国的民族问题,体现鲜明的中国特色、中国气派、中国风格,产生了巨大的国际影响,引起了国外学界、政界的相关研究人员对我国民族区域自治制度的关注。一些国家的研究人员专程来我国了解和学习民族区域自治制度,并应用于本国的民族政策之中。国外研究人员对我国民族区域自治制度的认知与评价,是从"他者"的视野看待我国的民族区域自治制度。通过分析国外研究人员对我国民族区域自治制度的相关研究成果,不仅有助于了解我国民族区域自治制度的国际影响,还有助于我们客观地审视民族区域自治制度在发展中存在的一些问题,从而进一步推动我国民族区域自治制度的创新与发展。

关键词：民族区域自治国际影响文本评价

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