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Light People:Professor Manijeh Razeghi

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Light(Science & Applications) 2024年第8期13卷 1451-1462页

作者： Hui wang cun Yu Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

The sense of light is the first sensation the human body *** importance of light is ***,we all know that the light we can see and perceive covers only a small section of the ***,for Light People,we feature a researcher who is committed to exploring different spectral bands of light ranging from deep ultraviolet to terahertz waves and working on quantum semiconductor technology,*** Razeghi of the Northwestern University in the United *** for her quick thinking and witty remarks,*** is passionate about life and always kind to *** a scientist,she does not limit her research to a single focus,instead,she works on the entire process from material selection,device design,processing,and manufacturing,all the way to product *** has a strong passion for education,a commitment unwavered by fame or *** her students,she is both a reliable source of knowledge and a motherly figure with a caring *** firmly believes that all things in nature can give her energy and *** science,she is a true“pioneer”in research and a“miner”of scientific *** advises young scientists to enjoy and love what they do,and turn their research into their *** a female scientist,she calls on all women to realize their true value and ***,let’s hear from Professor Manijeh Razeghi,a true star who radiates energy and light.

关键词： mother instead passion

Frequency Response of Modulated Electroluminescence of Light-Emitting Diodes

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Chinese Physics Letters 2011年第10期28卷 244-247页

作者： FENG Lie-Feng LI Yang LI Ding wang cun-da ZHANG Guo-Yi YAO Dong-Sheng LIU Wei-Fang XING Peng-Fei Department of Applied Physics Tianjin UniversityTianjin 300072 Research Center for Wide-band Gap Semiconductors School of PhysicsPeking UniversityBeijing 100871

Frequency responses of modulated electroluminescence(EL)of light-emitting diodes were measured using a testing *** increasing frequency of the ac signal,the relative light intensity(RLI)clearly ***,a peculiar asynchrony between the RLI and ac small-signal is *** frequencies higher than 10 kHz,the RLI clearly lags behind the ac signal and the absolute value of the lagging angle is nearly proportional to the signal *** the classical recombination model of light-emitting diodes under ac small-signal modulation,these abnormal characteristics of modulated EL can be clearly explained.

关键词： diodes absolute testing

CD56^brightCD25^＋ NK cells are preferentially recruited to the maternal/fetal interface in early human pregnancy

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Cellular & Molecular Immunology 2015年第1期12卷 77-86页

作者： Yu Tao Yan-Hong Li Hai-Lan Piao Wen-Jie Zhou Di Zhang Qiang Fu Song-cun wang da-Jin Li Mei-Rong Du Laboratory for Reproductive Immunology Hospital and Institute of Obstetrics and Gynecology Fudan University Shanghai Medical College Shanghai KeyLaboratory of Female Reproductive Endocrine Related Diseases Shanghai China

Decidual natural killer （dNK） cells are believed to be critical for maintaining maternal/fetal tolerance and regulating placental vascular remodeling based upon their abundance and unique phenotype during early pregnancy. However, the mechanism for how the dNK cells play such important roles in successful pregnancy remains undefined. Here, we identified a subtype of dNK cells characterized as having a CD3-CD56^brightCD25^＋ phenotype. We found that CD56^brightCD25^＋ NK cells preferentially localize to the maternal/fetal interface during early human pregnancy. CD25^＋ dNK cells account for approximately 75% of CD25-expressing decidual immune cells （DICs）. However, less than 5% of CD25-positive peripheral blood mononuclear cells are CD25^＋ NK cells. Furthermore, CD25^＋ and CD25^- dNK cells exhibit distinct phenotypes： CD25^＋ dNK cells display a more activated phenotype and greater cytokine-secreting capacity. Interestingly, coculture of peripheral NK （pNK） cells with primary trophoblasts upregulates the percentage of CD25-expressing pNK cells, resulting in increased expression of activation markers and cytokine production by pNK cells. In addition, we demonstrated that the CXCL12/CXCR4 axis is crucial for the recruitment of CD25^＋ dNK cells and contributes to the accumulation of CD3^-CD56^brightCD25^＋ dNK cells at the maternal/fetal interface. Thus, our data reveal that the crosstalk between trophoblasts and pNK cells leads to the accumulation of CD3^-CD56^brightCD25^＋ dNK cells, which exert a regulating effect at the maternal/fetal interface.

关键词： CXCL12/CXCR4 CD3^-CD56^brightCD25^+ N K cells maternal/fetal interface trophoblasts

Experimental study of negative capacitance in LEDs

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Optoelectronics Letters 2005年第2期1卷 124-126页

作者： FENG Lie-feng wang Jun ZHU Chuan-yun CONG Hong-xia CHEN Yong wang cun-da Department of Applied Physics Tianjin University Ticznjin 300072 China Department of Photoelectronics ＆ Physics Foshan University Foshan Guangdong 528000 China

The experimental study on negative capacitance（NO） of various light-emitting diodes（LEDs） is presented. Experimental result shows that all LEDs display the NO phenomenon. The voltage modulated electroluminescence（VMEL） experiment confirms that the reason of negative capacitance is the strong recombination of the injected carriers in the active region of luminescence. The measures also verify that the dependence of NO on voltage and frequency in different LEDs is similar. NO phenomenon is more obvious with higher voltage or lower frequency.

关键词：发光二极管负电容 LED 场致发光

Mechanism of negative capacitance in LEDs

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Optoelectronics Letters 2005年第2期1卷 127-130页

作者： FENG Lie-feng ZHU Chuan-yun CHEN Yong ZENG Zhi-bin wang cun-da Department of Applied Physics Tianjin University Tianjin 300072 P. R. China Department of Photoelectronics ＆ Physics Foshan Univ Foshan Guangdong 528000 China

In order to explain the phenomenon of negative capacitance（NC） in light emitting diodes LEDs, we present a new model based on local strong recombination in active region and firstly deduce the analytic expression of NO from continuity equation. The theoretical result indicates that the NC effect becomes stronger when the carrier recombination rate increases in a certain range,which is consistent with the experimental result. Accordingly,we confirm that the NO is caused by carrier recombination in active reaion instead of by other exterior factors.

关键词：发光二极管负电容 LED 解析表达连续性方程

Quantitative Analysis of Seeing with Height and Time at Muztagh-Ata Site Based on ERA5 database

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Research in Astronomy and Astrophysics 2024年第1期24卷 87-95页

作者： Xiao-Qi Wu cun-Ying Xiao Ali Esamdin Jing Xu Ze-Wei wang Luo Xiao Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China Department of Astronomy Beijing Normal UniversityBeijing 100875China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China

Seeing is an important index to evaluate the quality of an astronomical *** estimate seeing at the Muztagh-Ata site with height and time quantitatively,the European Centre for Medium-Range Weather Forecasts reanalysis database(ERA5)is *** calculated from ERA5 is compared consistently with the Differential Image Motion Monitor seeing at the height of 12 *** show that seeing decays exponentially with height at the Muztagh-Ata *** decays the fastest in fall in 2021 and most slowly with height in *** seeing condition is better in fall than in *** median value of seeing at 12 m is 0.89 arcsec,the maximum value is1.21 arcsec in August and the minimum is 0.66 arcsec in *** median value of seeing at 12 m is 0.72arcsec in the nighttime and 1.08 arcsec in the *** is a combination of annual and about biannual variations with the same phase as temperature and wind speed indicating that seeing variation with time is influenced by temperature and wind *** Richardson number Ri is used to analyze the atmospheric stability and the variations of seeing are consistent with Ri between *** quantitative results can provide an important reference for a telescopic observation strategy.

关键词： site testing atmospheric effects methods:data analysis telescopes Earth

Compaction and seepage characteristics of broken coal and rock masses in coal mining:A review in laboratory tests

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Rock Mechanics Bulletin

Rock Mechanics Bulletin 2024年第2期3卷 1-20页

作者： cun Zhang Yanhong Chen Zhaopeng Ren Fangtian wang School of Energy and Mining Engineering China University of Mining and Technology(Beijing)Beijing 100083China Engineering Research Center of Green and Intelligent Mining for Thick Coal Seam Ministry of EducationBeijing 100083China School of Mines China University of Mining&TechnologyXuzhou221116China

Broken coal and rock(BCR)are an important component medium of the caving zone in the goaf(or gob),as well as the main filling material of fault fracture zone and collapse *** compaction seepage characteristics of BCR directly affect the safe and efficient mining of coal ***,numerous laboratory studies have focused on the compaction seepage characteristics of *** paper first outlines the engineering problems involved in the BCR during coal mining including the air leakage,the spontaneous combustion,the gas drainage,and the un-derground reservoirs in the *** inrush related to tectonics such as faults and collapse columns and surface subsidence related to coal gangue filling and mining also involve the compaction seepage characteristics of *** on the field problems of BCR,many attempts have been made to mimic field environments in laboratory *** experimental equipment(cavity size and shape,acoustic emission,CT,etc.)and experimental design for the BCR were firstly *** main objects of laboratory analysis can be divided into compression tests and seepage *** the compaction test,the main research focuses on the bearing deformation characteristics(stress-strain curve),pore evolution characteristics,and re-crushing characteristics of *** seepage test mainly uses gas or water as the main medium to study the evolution characteristics of permeability under different compaction stress *** the laboratory tests,factors such as the type of coal and rock mass,particle size,particle shape,water pressure,temperature,and stress path are usually *** lateral compression test of BCR can be divided into three stages,including the self-adjustment stage,the broken stage,and the elastic stage or stable *** each stage,stress,deformation,porosity,energy,particle size and breakage rate all have their own *** test regarding the water permeability experiment of BCR is actually belong to variabl

关键词： Coal mining Broken coal and rock Laboratory test Engineering problems Experimental equipment Breakage characteristics Compaction characteristics Seepage characteristics

Catecholaminergic neurons orchestrate fasting-induced immune harmony

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Biophysics Reports 2024年第1期10卷 57-59页

作者： Mengdi Guo Weiyan wang Xiao Tu Meiling Jiang cun-Jin Zhang Department of Neurology Sichuan Provincial People's Hospital University of Electronic Science and Technology of China Department of Science and Technology Sichuan Provincial People's Hospital University of Electronic Science and Technology of China

Dietary fasting is a well-established intervention for immunosuppressive therapy, but the underlying mechanism remains elusive. Host fitness to nutritional stress has been confirmed to initiate a cascade of adaptive responses mediated by the central nervous system, shedding new light on a neural link between fasting and immunity(de Cabo and Mattson 2019).

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Near-infrared organic lasers with ultra-broad emission bands by simultaneously harnessing four-level and six-level systems

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Chinese Chemical Letters 2024年第8期35卷 288-293页

作者： Lei wang Jun-Jie Wu Chang-cun Yan Wan-Ying Yang Zong-Lu Che Xin-Yu Xia Xue-Dong wang Liang-Sheng Liao Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices Institute of Functional Nano&Soft Materials(FUNSOM)Soochow UniversitySuzhou 215123China Jiangsu Engineering Laboratory of Novel Functional Polymeric Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyMacao SAR 999078China

Organic lasers with broad emission bands in near-infrared(NIR)region are crucial for their applications in laser communication,night-vision as well as bioimaging owing to the abundance of selectable lasing ***,for most organic gain materials,gain regions are limited in a small wavelength range because of the fixed energy level ***,we design a strategy to realize NIR organic lasers with broad emission bands based on tunable energy level systems induced by cascaded excited-state intramolecular proton transfer(ESIPT).A novel gain material named DHNN was developed,which can undergo a cascaded double-ESIPT process supporting four-level and six-level systems *** doping DHNN into polystyrene microspheres,NIR lasers with tunable emission bands can be achieved based on the careful modulation of ***,organic lasers with an ultra-broad emission band ranging from 700 nm to 900 nm was successfully achieved by harnessing four-level and six-level systems simultaneously.

关键词： Excited-state intramolecular proton transfer Organic solid-state laser Wide gain interval Near-infrared emission Molecular design