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Flexible nanoimprint lithography enables high-throughput manufacturing of bioinspired microstructures on warped substrates for efficient III-nitride optoelectronic devices

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Science Bulletin 2024年第13期69卷 2080-2088页

作者： Siyuan Cui Ke Sun Zhefu Liao Qianxi Zhou Leonard Jin Conglong Jin Jiahui Hu kuo-sheng wen sheng Liu shengjun Zhou Center for Photonics and Semiconductors School of Power and Mechanical EngineeringWuhan UniversityWuhan 430072China The Institute of Technological Sciences Wuhan UniversityWuhan 430072China Department of Mechanical and Mechatronics Engineering University of WaterlooWaterloo ONN2L 3G1Canada Jiangxi SMTC Semiconductor Co. Ltd.Nanchang 330096China

III-nitride materials are of great importance in the development of modern optoelectronics,but they have been limited over years by low light utilization rate and high dislocation densities in heteroepitaxial films grown on foreign substrate with limited refractive index contrast and large lattice ***,we demonstrate a paradigm of high-throughput manufacturing bioinspired microstructures on warped substrates by flexible nanoimprint lithography for promoting the light extraction *** design a flexible nanoimprinting mold of copolymer and a two-step etching process that enable high-efficiency fabrication of nanoimprinted compound-eye-like Al2O3 microstructure(NCAM)and nanoimprinted compound-eye-like SiO_(2)microstructure(NCSM)template,achieving a 6.4-fold increase in throughput and 25%savings in economic costs over stepper projection *** to NCAM template,we find that the NCSM template can not only improve the light extraction capability,but also modulate the morphology of AlN nucleation layer and reduce the formation of misoriented GaN grains on the inclined sidewall of microstructures,which suppresses the dislocations generated during coalescence,resulting in 40%reduction in dislocation *** study provides a low-cost,high-quality,and high-throughput solution for manufacturing microstructures on warped surfaces of III-nitride optoelectronic devices.

关键词： Flexible nanoimprint lithography Bioinspired Micro-and nano-manufacturing III-nitride epitaxy Optoelectronic devices

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Effect of Butyl α-Hydroxymethyl Acrylate Monomer Structure on the Morphology Produced via Aqueous Emulsion Polymerization-induced Self-assembly

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Chinese Journal of Polymer Science 2020年第1期38卷 9-16,I0005页

作者： Shou-kuo Man Xiao Wang Jin-wen Zheng Ze-sheng An Institute of Nanochemistry and Nanobiology College of Environmental and Chemical EngineeringShanghai UniversityShanghai200444China State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China

Polymerization-induced self-assembly(PISA) is an efficient and versatile method to afford polymeric nano-objects with polymorphic morphologies. Compared to dispersion PISA syntheses based on soluble monomers, the vast majority of emulsion PISA formulations using insoluble monomers leads to kinetically-trapped spheres. Herein, we present aqueous emulsion PISA formulations generating worms and vesicles besides spheres. Two monomers with different butyl groups, n-butyl(n BHMA) and tert-butyl(t BHMA) α-hydroxymethyl acrylate, and thus possessing different water solubilities were synthesized via Baylis-Hillman reaction. Photoinitiated aqueous emulsion polymerizations of n BHMA and t BHMA employing poly(ethylene glycol) macromolecular chain transfer agents(macro-CTAs, PEG45-CTA, and PEG113-CTA) at 40 °C were systematically investigated to evaluate the effect of monomer structure and solubility on the morphology of the generated block copolymer nano-objects. Higher order morphologies including worms and vesicles were readily accessed for t BHMA, which has a higher water solubility than that of n BHMA. This study proves that plasticization of the core-forming block by water plays a key role in enhancing chain mobility required for morphological transition in emulsion PISA.

关键词： Block copolymer α-Hydroxymethyl acrylate RAFT emulsion polymerization Polymerization-induced self-assembly

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Global trends and hotspots of type 2 diabetes in children and adolescents:A bibliometric study and visualization analysis

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World Journal of Diabetes 2025年第1期16卷 140-168页

作者： Fang-Shuo Zhang Hai-Jing Li Xue Yu Yi-Ping Song Yan-Feng Ren Xuan-Zhu Qian Jia-Li Liu wen-Xun Li Yi-Ran Huang kuo Gao School of Acupuncture-Moxibustion and Tuina Beijing University of Chinese MedicineBeijing 100029China School of Traditional Chinese Medicine Beijing University of Chinese MedicineBeijing 100029China

BACKGROUND Epidemiological surveys indicate an increasing incidence of type 2 diabetes mellitus(T2DM)among children and adolescents *** to rapid disease progression,severe long-term cardiorenal complications,a lack of effective treatment strategies,and substantial socioeconomic burdens,it has become an urgent public health issue that requires management and *** T2DM differs from adult *** a significant increase in our understanding of youth-onset T2DM over the past two decades,the related review and evidence-based content remain *** To visualize the hotspots and trends in pediatric and adolescent T2DM research and to forecast their future research *** This study utilized the terms“children”,“adolescents”,and“type 2 diabetes”,retrieving relevant articles published between 1983 and 2023 from three citation databases within the Web of Science Core Collection(SCI,SSCI,ESCI).Utilizing CiteSpace and VoSviewer software,we analyze and visually represent the annual output of literature,countries involved,and participating *** allows us to predict trends in this research *** analysis encompasses co-cited authors,journal overlays,citation overlays,time-zone views,keyword analysis,and reference analysis,*** A total of 9210 articles were included,and the annual publication volume in this field showed a steady growth *** United States had the highest number of publications and the highest *** United States also had the most research institutions and the strongest research *** global hot journals were primarily diabetes professional journals but also included journals related to nutrition,endocrinology,and *** analysis showed that research related to endothelial dysfunction,exposure risk,cardiac metabolic risk,changes in gut microbiota,the impact on comorbidities and outcomes,etc.,were emerging *** have maintained their popularity in this field,sugges

关键词： Child Adolescent Type 2 diabetes mellitus Bibliometrics Knowledge mapping Visualization CiteSpace VOSviewer

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Asymptotic Distributions for Power Variation of the Solution to a Stochastic Heat Equation

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Acta Mathematica Sinica,English Series 2021年第9期37卷 1367-1383页

作者： wen sheng WANG School of Economics Hangzhou Dianzi UniversityHangzhou 310018P.R.China

Let u={u(t,x),t∈[0,T],x∈R}be a solution to a stochastic heat equation driven by a space-time white *** study that the realized power variation of the process u with respect to the time,properly normalized,has Gaussian asymptotic *** particular,we study the realized power variation of the process u with respect to the time converges weakly to Brownian motion.

关键词： Quadratic variation power variation stochastic heat equation weak convergence

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Caution in building a Burgers circuit for studying secondary dislocations

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Journal of Materials Science & Technology 2019年第6期35卷 1192-1197页

作者： wen-sheng Xu wen-Zheng Zhang Key Laboratory of Advanced Materials (MOE) School of Materials Science and EngineeringTsinghua University

As the Burgers vector of a secondary dislocation may not conform to the translation vectors in the periodic pattern in a high-resolution transmission electron microscope(HRTEM) image, a Burgers circuit directly constructed according to an HRTEM image may render a wrong Burgers vector. The HRTEM images of the habit plane(HP) of δ precipitate in an Inconel 718 alloy were re-examined by using different Burgers circuits, as an example. Evidence is found for predicted secondary dislocation associated with a down step. The Burgers vector of the dislocation is 1/6[112]/1/3[001]δ, determined with the Burgers circuit built on the reference of the displacement shift completely lattice(DSCL). It is consistent with both the calculated and the measured result of the major defects in the habit plane. Different Burgers vectors due to different Burgers circuits were explained quantitatively. The present study has a general implication for the determination of the Burgers vectors of secondary interfacial dislocations in other systems.

关键词： Dislocation Burgers vector Burgers circuit Coincidence site lattice (CSL) Displacement shift completely lattice (DSCL) Lattice correspondence

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A Certain Regular Property of the Method I Construction and Packing Measure

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Acta Mathematica Sinica,English Series 2007年第10期23卷 1769-1776页

作者： sheng You wen Department of Mathematics Hubei University Wuhan 430062 P. R. China

Let τ be a premeasure on a complete separable metric space and let τ＊ be the Method I measure constructed from τ. We give conditions on T such that τ＊ has a regularity as follows： Every τ＊-measurable set has measure equivalent to the supremum of premeasures of its compact subsets. Then we prove that the packing measure has this regularity if and only if the corresponding packing premeasure is locally finite.

关键词： method I construction regularity packing premeasure packing measure

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On discrete time hedging errors in a fractional Black-Scholes model

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Applied Mathematics(A Journal of Chinese Universities) 2017年第2期32卷 211-224页

作者： WANG wen-sheng College of Economics Hangzhou Dianzi UniversityHangzhou 310018China College of Science Hangzhou Normal UniversityHangzhou 310036China

In this paper we investigate asymptotic behavior of error of a discrete time hedging strategy in a fractional Black-Scholes model in the sense of Wick-ItS-Skorohod integration. The rate of convergence of the hedging error due to discrete-time trading when the true strategy is known for the trader, is investigated. The result provides new statistical tools to study and detect the effect of the long-memory and the Hurst parameter for the error of discrete time hedging.

关键词： discrete time hedging Wick-Itö-Skorohod integral rate of convergence weak convergence incomplete market fractional Brownian motion replicate Black-Scholes model

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On p-variation of bifractional Brownian motion

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Applied Mathematics(A Journal of Chinese Universities) 2011年第2期26卷 127-141页

作者： WANG wen-sheng Department of Mathematics Hangzhou Normal University Hangzhou 310036 China

In this paper we study p-variation of bifractional Brownian motion. As an applica-tion, we introduce a class of estimators of the parameters of a bifractional Brownian motion andprove that both of them are strongly consistent; as another application, we investigate fractalnature related to the box dimension of the graph of bifractional Brownian motion.

关键词： Bifractional Brownian motion variation strongly consistent fractal nature.

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A LIL and Limit Distributions for Trimmed Sums of Random Vectors Attracted to Operator Semi-stable Laws

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Acta Mathematica Sinica,English Series 2014年第9期30卷 1555-1565页

作者： wen sheng WANG Department of Mathematics Hangzhou Normal University

Let θ∈^d be a unit vector and let X, X1, X2,…… be a sequence of i.i.d. Xd-valued random vectors attracted to operator semi-stable laws. For each integer n ≥1, let X1,≤……≤ Xn,n denote the order statistics of X1, X2,..., Xn according to priority of index, namely ｜（X1,nθ）｜≥…≥ [（Xn,n,θ）1, where （., .） is an inner product on Rd. For all integers r ≥ 0, define by （r）Sn =∑n-r i=1Xi,n the trimmed sum. In this paper we investigate a law of the iterated logarithm and limit distributions for trimmed sums （r）Sn. Our results give information about the maximal growth rate of sample paths for partial sums of X when r extreme terms are excluded. A stochastically compactness of （r）Sn is obtained.

关键词： Operator semi-stable law domain of attraction law of the iterated logarithm stochastically compactness affine normalized partial sum trimmed sum

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Strong Laws of Large Numbers for Random Walks in Random Sceneries

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Acta Mathematicae Applicatae Sinica 2007年第3期23卷 495-500页

作者： wen-sheng Wang Department of Statistics East China Normal University Shanghai 200062 China

In this paper, we study strong laws of large numbers for random walks in random sceneries. Some mild sufficient conditions for the validity of strong laws of large numbers are obtained.

关键词： Random walk in random scenery law of large numbers

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