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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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TSCompiler: efficient compilation framework for dynamic-shape models

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Science China(Information Sciences) 2024年

作者： Xiang LUO Chen ZHANG Chenbo GENG Yanzhi YI jiahui hu Renwei ZHANG Zhen ZHANG Gianpietro CONSOLARO Fan YANG Tun LU Ning GU Li SHANG School of Computer Science Fudan University School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University School of Computer Science and Technology Harbin Institute of Technology huawei Technologies Co. Ltd. huawei Paris Research Center School of Microelectronics Fudan University

Today's deep learning models face an increasing demand to handle dynamic shape tensors and computation whose shape information remains unknown at compile time and varies in a nearly infinite range at runtime. This shape dynamism brings tremendous challenges for existing compilation pipelines designed for static models which optimize tensor programs relying on exact shape values. This paper presents TSCompiler, an end-to-end compilation framework for dynamic shape models. TSCompiler first proposes a symbolic shape propagation algorithm to recover symbolic shape information at compile time to enable subsequent optimizations. TSCompiler then partitions the shape-annotated computation graph into multiple subgraphs and fine-tunes the backbone operators from the subgraph within a hardware-aligned search space to find a collection of high-performance schedules. TSCompiler can propagate the explored backbone schedule to other fusion groups within the same subgraph to generate a set of parameterized tensor programs for fused cases based on dependence analysis. At runtime, TSCompiler utilizes an occupancy-targeted cost model to select from pre-compiled tensor programs for varied tensor shapes. Extensive evaluations show that TSCompiler can achieve state-of-the-art speedups for dynamic shape models. For example, we can improve kernel efficiency by up to 3.97× on NVIDIA RTX3090, and 10.30× on NVIDIA A100 and achieve up to five orders of magnitude speedups on end-to-end latency.

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以价值定位为导向的《中国机械工程》品牌建设实践

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编辑学报 2024年第3期36卷 328-332页

作者：胡佳慧卢湘帆湖北工业大学《中国机械工程》编辑部武汉430068

科技期刊的品牌影响力对学术交流和知识传播至关重要。本文以《中国机械工程》近年来的办刊实践为例,以期刊价值定位为导向,从关注机械学科发展动态、结合科研动向和热点题材、发挥编委优势、依托特色专辑、融合新媒体等方面着手,深入... 详细信息

科技期刊的品牌影响力对学术交流和知识传播至关重要。本文以《中国机械工程》近年来的办刊实践为例,以期刊价值定位为导向,从关注机械学科发展动态、结合科研动向和热点题材、发挥编委优势、依托特色专辑、融合新媒体等方面着手,深入阐述了该刊采取构建新栏目体系、加大定向约稿力度、策划特色专辑出版、组织多元化学术交流活动、探索新发展模式等一系列措施来提升品牌影响力的思路与做法。通过探析具体案例、期刊文献计量指标和《中国机械工程》微信公众平台数据验证了所述措施的成效,并进行了相关思考,以期为我国中文科技期刊能够在学术界树立良好口碑提供一定参考。

关键词：品牌影响力价值定位栏目体系定向约稿策划专辑多元化媒体融合

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基于改进CNN-LSTM和RF的铁水KR脱硫预测模型

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武汉科技大学学报 2024年第4期47卷 254-263页

作者：胡佳辉熊凌但斌斌吴经纬武汉科技大学信息科学与工程学院湖北武汉430081 武汉科技大学冶金自动化与检测技术教育部工程研究中心湖北武汉430081 中冶南方工程技术有限公司智能制造事业部湖北武汉430223

为实现较高精度的脱硫剂加入量预测,有效提高生产效益,本文提出一种基于改进卷积神经网络(CNN)-长短期记忆(LSTM)网络和随机森林(RF)结合的铁水脱硫两步预测模型。考虑到模型输入数据的相关性,利用皮尔逊相关系数确定各输入参数的相关... 详细信息

为实现较高精度的脱硫剂加入量预测,有效提高生产效益,本文提出一种基于改进卷积神经网络(CNN)-长短期记忆(LSTM)网络和随机森林(RF)结合的铁水脱硫两步预测模型。考虑到模型输入数据的相关性,利用皮尔逊相关系数确定各输入参数的相关性并筛选特征。模型以CNN-LSTM为基础,增加卷积层和残差连接,在提高挖掘数据的高维特征信息的同时避免网络退化。为增加网络对特征的区分和关注能力,引入多头注意力机制,让网络更加关注特征中的重要信息。使用贝叶斯优化RF超参数构建误差预测模型从而实现残差推理,对改进的CNN-LSTM模型预测结果进行修正。以现场采集的数据进行实验,结果表明,与CNN-LSTM模型相比,本文模型的拟合精度R2提升了17.11%,平均绝对值误差MAE降低了24.85%,均方根误差RMSE降低了30.18%,平均绝对百分比误差MAPE降低了28.33%。

关键词： KR脱硫模型卷积神经网络长短期记忆网络注意力机制随机森林

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Growth of InGaN-based blue-LED on AlN/sapphire sputtered with different oxygen flow rate

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Frontiers of Optoelectronics 2021年第4期14卷 507-512页

作者： jiahui hu Feng WU Jiangnan DAI Changqing CHEN Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

Indium gallium nitride(InGaN)based blue light-emitting diodes(LEDs)suffer from insufficient crystal quality and serious efficiency droop in large forward *** this paper,the InGaN-based blue LEDs are grown on sputtered aluminum nitride(AlN)films to improve the device light power and weaken the efficiency *** effects of oxygen flow rate on the sputtering of AlN films on sapphire and device performance of blue LEDs are studied in *** mechanism of external quantum efficiency improvement is related to the change of V-pits density in multiple quantum *** external quantum efficiency of 66%and 3-V operating voltage are measured at a 40-mA forward current of with the optimal oxygen flow rate of 4 SCCM.

关键词： light-emitting diode(LED) sputtered aluminum nitride(AlN) physical vapor deposition(PVD) metalorganic chemical vapor deposition(MOCVD)

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有机神经形态机器视觉器件及系统

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中国科学：化学 2024年第4期54卷 446-467页

作者：胡嘉慧江明浩周晔文心洁翟永彪吕子玉韩素婷深圳大学电子与信息工程学院深圳518060 香港理工大学应用生物及化学科技系中国香港999077 深圳大学高等研究院深圳518060

随着有机半导体材料及其器件的快速发展,有机电子学在可穿戴设备、人工智能等发面取得快速发展.有机半导体材料具有成本低、生物相容性好、光谱响应可调、柔性度好等优势,在光电器件等新兴智能感知领域显示出巨大的商业应用潜力,同时也... 详细信息

随着有机半导体材料及其器件的快速发展,有机电子学在可穿戴设备、人工智能等发面取得快速发展.有机半导体材料具有成本低、生物相容性好、光谱响应可调、柔性度好等优势,在光电器件等新兴智能感知领域显示出巨大的商业应用潜力,同时也是制造柔性仿生视觉传感器不可或缺的组成部分.本文从有机光电材料分类及用于视觉仿生感知的光电器件层面重点介绍了近年来人工神经形态视觉智能传感系统的研究进展,包括应用较多的视觉触觉多感集成系统.最后阐述了发展有机仿生视觉系统的重要意义与现存挑战以及展望,为将来有机视觉感知应用及多感集成提供可行的研究方向.

关键词：有机材料光电突触仿生应用多感融合智能感知

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Nerve growth factor pretreatment against glutamate-induced hippocampal neuronal injury Action mechanism of phosphatase and tensin homologue deleted on chromosome 10

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Neural Regeneration Research 2010年第1期5卷 5-9页

作者： Yae hu jiahui Mao Yan Zhu Ailing Zhou Department of Pathophysiology Medical School of Nantong University Nantong 226001 Jiangsu Province China

BACKGROUND： Nerve growth factor （NGF） attenuates glutamate-induced injury to hippocampal neurons, and the human tumor suppressor gene phosphatase and tensin homologue deleted on chromosome 10 （PTEN） promotes neuronal apoptosis. However, effects of PTEN in NGF-mediated neuroprotection against glutamate excitotoxicity remain poorly understood. OBJECTIVE： To investigate the relationship between NGF inhibition of glutamate-induced injury and PTEN. DESIGN, TIME AND SE＇I＇rlNG： The randomized, controlled, in vitro study was performed at the Department of Pathophysiology, Medical School of Nantong University, China from October 2007 to March 2008. MATERIALS： Glutamate, NGF, 4, 6-diamidino-2-phenyl-indolediacetate, 3-[4, 5-dimethylthiazol-2-yl]- 2, 5-diphenyl tetrazoliumbromide （M-I-F）, and lactate dehydrogenase kit （Sigma, USA）, fluorescence microscope and inverted phase contrast microscope （Olympus, Japan） were used in this study. METHODS： Hippocampal neurons were obtained from newborn （〈 24 hours） Sprague Dawley rats and cultured for 7 days. The control group was not treated with any intervention factor, the glutamate group was treated with glutamate （0.2 mmol/L）, and NGF groups were treated with NGF （10, 50, 100, and 200 μg/L, respectively） prior to glutamate treatment. MAIN OUTCOME MEASURES： The MTT and lactate dehydrogenase assays were applied to evaluate viability of hippocampal neurons. Morphological changes in hippocampal neurons were observed using an inverted phase-contrast microscope, and neuronal apoptosis was detected by 4, 6-diamidino-2- phenyl-indolediacetate staining. PTEN mRNA and protein expression were measured by reverse transcription-polymerase chain reaction and Western blot analysis, respectively. RESULTS： Glutamate （0.2 mmol/L） induced significantly decreased neuronal viability and greater lactate dehydrogenase efflux compared with the control group （P 〈 0.01）. However, compared with the glutamate group, cell viability significantly increased and lac

关键词： nerve growth factor glutamate phosphatase and tensin homologue deleted on chromosome 10 hippocampus neurons nerve factor

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基于“五脏别通”理论的穴位埋线治疗不同证型肥胖型高脂血症临床研究

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新中医 2024年第11期56卷 141-146页

作者：胡赫其胡佳慧冯祯根陈泽莉浙江中医药大学附属金华市中医院浙江金华321017 浙江省人民医院浙江杭州310014

目的:观察基于“五脏别通”理论的穴位埋线治疗不同证型肥胖型高脂血症患者的疗效。方法:选取100例肥胖型高脂血症患者,按中医证型分为痰浊阻遏组、脾肾阳虚组、气滞血瘀组、肝肾阴虚组、阴虚阳亢组,每组20例。5组均采用“五脏别通”理... 详细信息

目的:观察基于“五脏别通”理论的穴位埋线治疗不同证型肥胖型高脂血症患者的疗效。方法:选取100例肥胖型高脂血症患者,按中医证型分为痰浊阻遏组、脾肾阳虚组、气滞血瘀组、肝肾阴虚组、阴虚阳亢组,每组20例。5组均采用“五脏别通”理论的穴位埋线。均连续治疗6周。比较5组临床疗效,比较5组治疗前后中医证候积分、体质量指数(BMI)、脂肪率(F%)、总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白胆固醇(HDL-C)。结果:治疗后,5组中医证候积分均较治疗前下降(P0.05),两两组间比较,差异均无统计学意义(P>0.05)。结论:基于“五脏别通”理论指导下的穴位埋线治疗不同中医证型肥胖型高脂血症均有确切疗效,且对痰浊阻遏证患者在改善TC方面优于其他证型。

关键词：肥胖型高脂血症五脏别通穴位埋线中医证型中医证候积分

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Compact finite difference schemes for the backward fractional Feynman–Kac equation with fractional substantial derivative

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Chinese Physics B 2019年第10期28卷 226-236页

作者： jiahui hu Jungang Wang Yufeng Nie Yanwei Luo Department of Applied Mathematics Northwestern Polytechnical UniversityXi’an 710129China College of Science Henan University of TechnologyZhengzhou 450001China

The fractional Feynman-Kac equations describe the distributions of functionals of non-Brownian motion, or anomalous diffusion, including two types called the forward and backward fractional Feynman-Kac equations, where the nonlocal time-space coupled fractional substantial derivative is involved. This paper focuses on the more widely used backward version. Based on the newly proposed approximation operators for fractional substantial derivative, we establish compact finite difference schemes for the backward fractional Feynman-Kac equation. The proposed difference schemes have the q-th(q = 1, 2, 3, 4) order accuracy in temporal direction and fourth order accuracy in spatial direction, respectively. The numerical stability and convergence in the maximum norm are proved for the first order time discretization scheme by the discrete energy method, where an inner product in complex space is introduced. Finally, extensive numerical experiments are carried out to verify the availability and superiority of the algorithms. Also, simulations of the backward fractional Feynman-Kac equation with Dirac delta function as the initial condition are performed to further confirm the effectiveness of the proposed methods.

关键词： backward fractional Feynman-Kac equation fractional substantial derivative compact finite difference scheme numerical inversion of Laplace transforms

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Impact of T_(i)/T_(e )ratio on ion transport based on EAST H-mode plasmas

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Plasma Science and Technology 2024年第4期26卷 68-78页

作者：刘建文臧庆梁云峰陈佳乐邬潇河 Alexander KNIEPS 扈嘉辉金仡飞张斌储宇奇刘海庆吕波段艳敏李妙辉陈颖杰龚先祖 the EAST Team Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich 52425Germany

At the EAST tokamak, the ion temperature(T_(i)) is observed to be clamped around 1.25 keV in electron cyclotron resonance(ECR)-heated plasmas, even at core electron temperatures up to 10 keV(depending on the ECR heating power and the plasma density). This clamping results from the lack of direct ion heating and high levels of turbulence-driven transport. Turbulent transport analysis shows that trapped electron mode and electron temperature gradient-driven modes are the most unstable modes in the core of ECR-heated H-mode plasmas. Nevertheless, recently it was found that the T_(i)/T_(e)ratio can increase further with the fraction of the neutral beam injection(NBI) power, which leads to a higher core ion temperature(Ti0). In NBI heating-dominant H-mode plasmas, the ion temperature gradient-driven modes become the most unstable ***, a strong and broad internal transport barrier(ITB) can form at the plasma core in high-power NBI-heated H-mode plasmas when the T_(i)/T_(e)ratio approaches ~1, which results in steep core Teand Tiprofiles, as well as a peaked neprofile. Power balance analysis shows a weaker Teprofile stiffness after the formation of ITBs in the core plasma region, where Ticlamping is broken,and the core Tican increase further above 2 keV, which is 80% higher than the value of Ticlamping in ECR-heated plasmas. This finding proposes a possible solution to the problem of Ticlamping on EAST and demonstrates an advanced operational regime with the formation of a strong and broad ITB for future fusion plasmas dominated by electron heating.

关键词： ion temperature clamping transport neutral beam injection stiffness internal transport barrier

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