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Oxide-aperture-dependent output characteristics of circularly symmetric VCSEL structure

Chinese Physics B 2020年第2期29卷 275-281页

作者： Wen-Yuan Liao Jian Li Chuan-Chuan Li Xiao-Feng Guo Wen-Tao Guo Wei-Hua Liu Yang-Jie Zhang Xin Wei man-qing tan State Key Laboratory of Integrated Optoelectronic Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Laboratory of Nano-photoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

The influence ot oxidation aperture on the output characteristics ot the circularly symmetric vertical-cavity-surtaceemitting laser(VCSEL) structure is *** do so,VCSELs with different oxide aperture sizes are simulated by the finite-difference time-domain(FDTD) *** relationships among the field distribution of mode superposition,mode wavelength,output spectra,and far-field divergence with different oxide apertures are ***,VCSELs respectively with oxide aperture sizes of 2.7 μm,4.4 μm,5.9 μm,7 μm,8 μm,9 μm,and 18.7 μm are fabricated and *** maximum output power increases from 2.4 mW to 5.7 mW with oxide aperture increasing from 5.9 μm to 9 μ***,the wavelength tuning rate decreases from 0.93 nm/mA to 0.375 nm/mA when the oxide aperture increases from 2.7 μm to 9 μ*** thermal resistance decreases from 2.815℃/mW to 1.015℃/mW when the oxide aperture increases from 4.4 μm to 18.7μ*** is demonstrated theoretically and experimentally that the wavelength spacing between adjacent modes increases with the augment of the injection current and the spacing becomes smaller with the oxide aperture *** it can be reported that the aperture size can effectively reduce the mode overlaying but at the cost of the power decreasing and the wavelength tuning rate and thermal resistance increasing.

关键词： finite-difference time-domain(FDTD) vertical-cavity-surface-emitting laser(VCSEL) oxide aperture wavelength spacing

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A novel polystyrene-poly(hydroxamic acid)interpenetrating polymer network and its adsorption towards rare earth ions

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Journal of Rare Earths 2022年第1期40卷 127-134页

作者： Xiaoyan Cao qing Wang Shuai Wang Ruilin man College of Chemistry and Chemical Engineering Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese ResourcesCentral South UniversityChangsha 410083China School of Chemical and Environmental Engineering Jiangxi Province Engineering Research Center of Ecological Chemical IndustryJiujiang UniversityJiujiang 332005China

A novel polystyrene-poly(hydroxamic acid)interpenetrating network resin(PS-PHA IPNs)was successfully synthesized by suspension polymerization and interpenetrating network *** effects of various experimental parameters,including pH,contact time and initial concentrations of rare earth ions on the adsorption capacity were discussed in *** the condition of pH 4.0(La^(3+)),1.0(Ce^(3+))and 3.0(Y^(3+)),respectively,PS-PHA IPNs can reach equilibrium adsorption in 6 h and get maximum adsorption capacities(1.08,1.43 and 1.36 mmol/g).The adsorption process of PS-PHA IPNs for La(Ⅲ),Ce(Ⅲ)and Y(Ⅲ)ions can be described by liquid membrane diffusion,particle diffusion and chemical *** adsorption process is a spontaneous and endothermic process and can be better simulated by Langmuir adsorption *** studies of SEM-EDS indicate that rare earth ions are adsorbed on the surface of PS-PHA *** transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS)analysis further prove that rare earth ions are chemisorbed on the surface of PS-PHA *** results reveal that the as-prepared PS-PHA IPNs is a promising adsorbent for adsorption of rare earth ions due to their higher adsorption capacity than other adsorbents.

关键词： Adsorption Interpenetrating polymer networks Synthesis Rare earth ions

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Scalable and High-Quality Monolayer Graphene Transfer onto Polymer Membranes Assisted by Camphor

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Chinese Journal of Polymer Science 2024年第12期42卷 1986-2001,I0011页

作者： Jun-Kan Yue Jing Liang Qiao-Yu tan man Chen Jing-Wen Li qing Guo Run-Lai Li Qiang Fu College of Polymer Science&Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu610065China

The quest for scalable integration of monolayer graphene into functional composites confronts the bottleneck of high-fidelity transfer onto substrates,crucial for unlocking graphene’s full potential in advanced *** this,our research introduces the camphor-assisted transfer(CAT)method,a novel approach that surmounts common issues of residue and structural deformation endemic to existing *** in the sublimation dynamics of camphor,the CAT method achieves a clean,contiguous transfer of centimeter-scale monolayer graphene onto an array of polymer films,including ultra-thin polyethylene *** resultant ultrathin graphene-polyethylene(gPE)films,characterized by their exceptional transparency and conductivity,reveal the CAT method’s unique ability to preserve the pristine quality of graphene,underscoring its practicality for preparing flexible transparent electrodes by monolayer ***-depth mechanism investigation into the camphor sublimation during CAT has led to a pivotal realization:the porosity of the target polymer substrate is a determinant in achieving high-quality graphene *** that camphor sublimates initially from the polymer side is crucial to prevent the formation of wrinkles or delamination of *** extensive examination of CAT on a spectrum of commonly used polymer films,including PE,PP,PTFE,PI and PET,we have confirmed this important *** discovery offers crucial guidance for fabricating monolayer graphene-polymer composite films using methods akin to CAT,underscoring the significance of substrate selection in the transfer process.

关键词： Polyethylene Monolayer graphene Camphor Graphene/polymer composites van der Waals interaction

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Regioregular Asymmetric Diketopyrrolopyrrole Copolymers with Good Molecular Ordered Assembly Ability for High-performance Polymer Transistors

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Chinese Journal of Polymer Science 2023年第8期41卷 1215-1222,I0006页

作者： qing-qing Liu Jia-Xin Yang man Zhao Can Gao Bo Guan Huan-Li Dong Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

Introduction of asymmetric units into conjugated polymers is an important strategy to regulate the photophysical and electronic properties of polymers,as asymmetric units can not only regulate solubility and energy levels,but also molecular stacking and orientation,thus giving much higher optoelectronic ***,very few studies have been reported in this *** semiconducting properties of conjugated polymers could be regulated through regioregularity ***,we took the asymmetric thiophene/pyridine side group DPP as core and developed the regioregular monomer T-Py-DPP through three steps:alkyl chain introduction,tin monomer coupling and NBS double *** T-Py-DPP monomer was polymerized into reg-PPy TDPP-2FBT with a head-to-head *** regioregularity of T-Py-DPP unit endowed reg-PPy TDPP-2FBT with backbone planarity,self-assembly orientation,network-like morphology and high crystallinity in films,thus the superior bipolar transport *** highest hole and electron mobilities of reg-PPy TDPP-2FBT were 0.93 and 0.57 cm^(2)·V^(-1)·s^(-1),respectively,with 40%improvement relative to the regiorandom polymer.

关键词： Asymmetric copolymers Regioregularity Good orientation Organic field-effect transistor Enhanced performance

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Exceptional points enhance sensing in silicon micromechanical resonators

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Microsystems & Nanoengineering 2024年第1期10卷 17-25页

作者： man-Na Zhang Lei Dong Li-Feng Wang qing-An Huang Key Laboratory of MEMS of the Ministry of Education Southeast UniversityNanjing 210096China

Exceptional points(EPs)have recently emerged as a new method for engineering the response of open physical systems,that is,systems that interact with the *** systems at the EPs exhibit a strong response to a small ***,we show a method by which the sensitivity of silicon resonant sensors can be enhanced when operated at *** our experiments,we use a pair of mechanically coupled silicon micromechanical resonators constituting a parity-time(PT)-symmetric *** perturbations introduced on the mechanically coupled spring cause the frequency to split from the EPs into the PT-symmetric regime without broadening the two spectrum linewidths,and this frequency splitting scales with the square root of the perturbation *** overall signal-tonoise ratio is still greatly enhanced,although the measured noise spectral density of the EP sensing scheme has a slight increase comparable to the traditional *** results pave the way for resonant sensors with ultrahigh sensitivity.

关键词： resonant symmetric points

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Modified artificial neural network model with an explicit expression to describe flow behavior and processing maps of Ti2AlNb-based superalloy

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Journal of Iron and Steel Research International 2021年第11期28卷 1451-1462页

作者： Yan-qi Fu qing Zhao man-qian Lv Zhen-shan Cui School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Institute of Forming Technology and Equipment Shanghai Jiao Tong UniversityShanghai 200030China

The elevated-temperature deformation behavior of Ti2AlNb superalloy was observed by isothermal compression experiments in a wide range of temperatures(950–1200°C)and strain rates(0.001–10 s^(-1)).The flow behavior is nonlinear,strongly coupled,and *** constitutive models,namely the double multivariate nonlinear regression model,artificial neural network model,and modified artificial neural network model with an explicit expression,were applied to describe the Ti2AlNb superalloy plastic deformation *** comparative predictability of those constitutive models was further evaluated by considering the correlation coefficient and average absolute relative *** comparative results show that the modified artificial network model can describe the flow stress of Ti2AlNb superalloy more accurately than the other developed constitutive *** explicit expression obtained from the modified artificial neural network model can be directly used for finite element *** modified artificial neural network model solves the problems that the double multivariate nonlinear regression model cannot describe the nonlinear,strongly coupled,and multivariable flow behavior of Ti2AlNb superalloy accurately,and the artificial neural network model cannot be embedded into the finite element software ***,the modified artificial neural network model is mainly dependent on the quantity of high-quality experimental data and characteristic variables,and the modified artificial neural network model has not physical ***,the processing maps were applied to obtain the optimum processing parameters.

关键词： Modified artificial neural network model Ti2AlNb superalloy Double multivariate nonlinear regression model Explicit expression Processing map

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Effect of austempering time on microstructure and properties of a low-carbon bainite steel

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International Journal of Minerals,Metallurgy and Materials 2020年第3期27卷 340-346页

作者： man Liu Guang Xu Jun-yu Tian qing Yuan Xin Chen The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology

The effect of austempering time after the bainitic transformation on the microstructure and property in a low-carbon bainite steel was investigated by metallography and dilatometry. The results showed that by prolonging the austempering time after the bainite transformation, the amount of large-size martensite/austenite islands decreased, but no significant change of the amount and morphology of bainite were observed. In addition, more austenite with a high carbon content was retained by prolonging the holding time at the bainite transformation ***, with a longer holding time, the elongation was improved at the expense of a small decrease in tensile strength. Finally, the Avrami equation B(RF) = 1-exp(-0.0499 × t^0.7616) for bainite reaction at 350℃ was obtained for the tested steel. The work provided a reference for tailoring the properties of low-carbon steels.

关键词： austempering time retained austenite martensite/austenite island low-carbon bainite transformation kinetics

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Genetic diversity and population structure of Camellia huana(Theaceae),a limestone species with narrow geographic range,based on chloroplast DNA sequence and microsatellite markers

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Plant Diversity 2020年第5期42卷 343-350页

作者： Shuang Li Shang-Li Liu Si-Yu Pei man-man Ning Shao-qing tang Guangxi Key Laboratory of Rare and Endangered Animal Ecology College of Life ScienceGuangxi Normal UniversityGuilinChina Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection Ministry of EducationGuangxi Normal UniversityGuilinChina Longtan Nature Reserve management Center HechiChina College of Life Science Guangxi Normal UniversityGuilinGuangxi 541006China

Camellia huana is an endangered species with a narrow distribution in limestone hills of northern Guangxi and southern Guizhou provinces,*** used one chloroplast DNA(cpDNA)fragment and 12 pairs of microsatellite(simple sequence repeat;SSR)markers to assess the genetic diversity and structure of 12 *** populations.A total of 99 alleles were detected for 12 polymorphic loci,and eight haplotypes and nine polymorphic sites were detected within 5200 bp of *** populations showed a low level of genetic diversity(n=8,Hd=0.759,Pi=0.00042 for cpDNA,NA=3.931,HE=0.466 for SSRs),but high genetic differentiation between populations(FST=0.2159 for SSRs,FST=0.9318 for cpDNA).This can be attributed to the narrow distribution and limestone habitat of *** analysis divided natural *** populations into two groups,consistent with their geographical ***,we suggest that five natural *** populations should be split into two units to be managed effectively.

关键词： Camellia huana Genetic diversity Genetic structure Conservation implications

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Highly doped NaErF_(4)-based nanocrystals for multi-tasking application

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Journal of Rare Earths 2021年第12期39卷 1467-1476,I0001页

作者： Yulin Xie qing Chen man Wang Weilin Chen Zewei Quan Chunxia Li Institute of Molecular Sciences and Engineering Institute of Frontier and Interdisciplinarity ScienceShandong UniversityQingdao 266237China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China

How to engineer single nanocrystal to achieve multiple functions is still a huge *** this work,a novel highly doped rare earth nanocrystal NaErF_(4)@NaGdF_(4)@NaDyF_(4)(Er@Gd@Dy)was designed and fabricated,which exhibits various performances by itself,including the longitudinal(T1)and transverse relaxation time(T2)double-mode magnetic resonance imaging(MRI),upconversion luminescence and down-shifting *** irradiation of 808 nm near-infrared(NIR)light,the upconverted red light can indirectly activate the photo sensitizer Ce6 conjugated on the surface of nanocrystals for photodynamic therapy(PDT).In vivo experiments demonstrate that the nano materials can eradicate notably primary tumors without obvious systematic *** addition,the longitudinal and transverse relaxation rates of Er@Gd@Dy are 24.83 and 319.86(mmol/L)^(-1)/s,respectively,which are superior to those of the nanocrystals reported ***,the nanocrystals have the ability to generate NIR-Ⅱlight located at 1530 nm,favorable in bioimaging in deeper *** a consequence,this new nanoplatform will advance the improvement of multimodal imaging guided tumor diagnosis and treatment.

关键词： Rare earth nanocrystals MRI Upconversion NIR-Ⅱwindow Photodynamic therapy

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A heterotrophic nitrification-aerobic denitrification bacterium Halomonas venusta TJPU05 suitable for nitrogen removal from high-salinity wastewater

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Frontiers of Environmental Science & Engineering 2022年第6期16卷 13-22页

作者： Quanli man Peilian Zhang Weiqi Huang qing Zhu Xiaoling He Dongsheng Wei State Key Laboratory of Separation Membrane and Membrane Process School of Environmental Science and EngineeringTiangong UniversityTianjin 300387China School of Chemistry Tiangong UniversityTianjin 300387China Key Laboratory of Molecular Microbiology and Technology Ministry of EducationCollege of Life ScienceNankai UniversityTianjin 300071China

A novel salt-tolerant heterotrophic nitrification and aerobic denitrification(HN-AD)bacterium was isolated and identified as Halomonas venusta TJPU05(*** TJPU05).The nitrogen removal performance of *** TJPU05 in simulated water(SW)with sole or mixed nitrogen sources and in actual wastewater(AW)with high concentration of salt and nitrogen was *** results showed that 86.12%of NH_(4)^(+)-N,95.68%of NO_(3)^(-)-N,100%of NO_(2)^(-)-N and 84.57%of total nitrogen(TN)could be removed from SW with sole nitrogen sources within 24 h at the *** TJPU05 could maximally remove 84.06%of NH_(4)^(+)-N,92.33%of NO_(3)^(-)-N,92.9%of NO_(2)^(-)-N and 77.73%of TN from SW with mixed nitrogen source when the salinity was above 8%.The application of *** TJPU05 in treating AW with high salt and high ammonia nitrogen led to removal efficiencies of 50.96%,47.28%and 43.19%for NH_(4)^(+)-N,NO_(3)^(-)-N and TN respectively without any ***,the activities of nitrogen removal–related enzymes of the strain were also *** successful detection of high level activities of ammonia oxygenase(AMO),hydroxylamine oxidase(HAO),nitrate reductase(NAR)and nitrite reductase(NIR)enzymes under high salinity condition further proved the HN-AD and salt-tolerance capacity of *** *** results demonstrated that the *** TJPU05 has great potential in treating high-salinity nitrogenous wastewater.

关键词： Salt-tolerant bacteria H.venusta TJPU05 Heterotrophic nitrification and aerobic denitrification High-salinity wastewater

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