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Study on the performance of thin-film VCSELs on composite metal substrate

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Frontiers of Optoelectronics 2023年第4期16卷 1-11页

作者： William Anderson Lee Sanchez Shreekant Sinha po‑yu wang Ray‑Hua Horng Institute of Electronics Yang Ming Chiao Tung UniversityHsinchu 30010China

Thin film p-side up vertical-cavity surface-emitting lasers(VCSELs)with 940 nm wavelength on a composite metal(Copper/Invar/Copper;CIC)substrate has been demonstrated by twice-bonding transfer and substrate removing *** CIC substrate is a sandwich structure with a 10µm thick Copper(Cu)layer/30µm thick Invar layer/10µm thick Cu *** Invar layer was composed of Iron(Fe)and Nickel(Ni)with a proportion of 70:*** thermal expansion coefcient of the composite CIC metal can match that of the GaAs *** results that the VCSEL layers can be successfully transferred to CIC metal substrate without *** 1 mA current,the top-emitting VCSEL/GaAs and thin-flm VCSEL/CIC had a voltage of 1.39 and 1.37 V,*** optical output powers of VCSEL/GaAs and VCSEL/CIC were 21.91 and 24.40 mW,*** 50µm thick CIC substrate can play a good heat dissipation function,which results in improving the electrical and optical characteristics of thin flm VCSELs/*** VCSEL/CIC exhibited a superior thermal management capability as compared with VCSEL/*** obtained data suggested that VCSELs on a composite metal substrate not only afected signifcantly the characteristics of thin film VCSEL,but also improved considerably the device thermal performance.

关键词： Thin film VCSELs GaAs substrate Composite metal CIC substrate Twice-bonding transfer Electrical properties Heat dissipation

Linear-Quadratic Pareto Cooperative Game for Mean-Field Backward Stochastic System

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Journal of Systems Science & Complexity 2024年第3期37卷 947-964页

作者： wang yu School of Control Science and Engineering Shandong UniversityJinan 250061China

This paper focuses on a Pareto cooperative differential game with a linear mean-field backward stochastic system and a quadratic form cost functional. Based on a weighted sum optimality method, the Pareto game is equivalently converted to an optimal control problem. In the first place,the feedback form of Pareto optimal strategy is derived by virtue of decoupling technology, which is represented by four Riccati equations, a mean-field forward stochastic differential equation(MF-FSDE),and a mean-field backward stochastic differential equation(MF-BSDE). In addition, the corresponding Pareto optimal solution is further obtained. Finally, the author solves a problem in mathematical finance to illustrate the application of the theoretical results.

关键词： Backward stochastic differential equation linear-quadratic control mean-field Pareto optimality

A guidance and control design with reduced information for a dual-spin stabilized projectile

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Defence Technology（防务技术） 2024年第3期33卷 494-505页

作者： yu wang Jiyan yu Xiaoming wang Jia Fangxiu Intelligent Ammunition Technology National Defense Key Discipline Laboratory Nanjing University of Science and TechnologyNanjingJiangsu210094China

In this paper,an integrated guidance and control method based on an adaptive path-following controller is proposed to control a spin-stabilized projectile with only translational motion information under the constraint of an actuator,uncertainties in aerodynamic parameters and measurements,and control system *** to the fairly high rotation speed,the dynamic model of this missile is strongly nonlinear,uncertain and coupled in pitch,yaw and roll channels.A theoretical equivalent resultant force and uncertainty compensation method are comprehensively used to realize decoupling of pitch and *** response to the strong nonlinear and time-varying characteristics of the dynamic system,the quasi-linear model whose parameters are obtained by interpolation of points selected as the segmentation points in the trajectory envelope,is used for calculation in each *** cope with the system uncertainty caused by model approximation,parameter uncertainty and ballistic interference,an extended state estimator is used to compensate the output feedback according to the test ballistic *** order to improve the tracking efficiency and ensure the tracking error convergence with only translational motion information,the virtual guide point,whose derivative is deduced according to the Lyapunov principle,is calculated in real time according to the projection relationship between the real-time position and the reference trajectory,and a virtual line-of-sight angle and the backstepping method are used for the design of the guidance and control *** order to avoid the influence of control input saturation on the guidance and control performance due to the actuator limitation and improve the robustness of the system,an anti-saturation compensator is designed according to the two-step *** feasibility and effectiveness of the path-following controller is verified through closed-loop flight simulations with measurement,control,and condition *** result

关键词： Spin-stabilized projectile Reduced information Path-following control Extended state observer Coupled nonlinear system Input saturation

Light People:Professor Laura Na Liu

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Light(Science & Applications) 2024年第2期13卷 184-189页

作者： Hui wang Cun yu Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of Sciences130033ChangchunChina

Editorial The DNA nanotechnology outlines a new chapter in biological sciences,opening a new era of scientific and technological advancements.A pioneer of DNA nanotechnology,Professor Liu from the University of Stuttgart in Germany,our latest Light People,has been working at the interface,where nanophotonics meets biology and *** the path of scientific explorations.

关键词： chemistry. advancement pioneer

GraphFlow+:Exploiting Conversation Flow in Conversational Machine Comprehension with Graph Neural Networks

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Machine Intelligence Research 2024年第2期21卷 272-282页

作者： Jing Hu Lingfei Wu yu Chen po Hu Mohammed J.Zaki School of Computer Science Central China Normal UniversityWuhan 430079China Pinterest San Francisco 94016USA Meta Mountain View 94039USA Rensselaer polytechnic Institute Troy 12180USA

The conversation machine comprehension(MC)task aims to answer questions in the multi-turn conversation for a single ***,recent approaches don’t exploit information from historical conversations effectively,which results in some references and ellipsis in the current question cannot be *** addition,these methods do not consider the rich semantic relationships between words when reasoning about the passage *** this paper,we propose a novel model GraphFlow+,which constructs a context graph for each conversation turn and uses a unique recurrent graph neural network(GNN)to model the temporal dependencies between the context graphs of each ***,we exploit three different ways to construct text graphs,including the dynamic graph,static graph,and hybrid graph that combines the *** experiments on CoQA,QuAC and DoQA show that the GraphFlow+model can outperform the state-of-the-art approaches.

关键词： Conversational machine comprehension(MC) reading comprehension question answering graph neural networks(GNNs) natural language processing(NLP)

Annihilator Ideals of Indecomposable Modules of Finite-Dimensional pointed Hopf Algebras of Rank One

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Algebra Colloquium 2024年第1期31卷 149-164页

作者： yu wang School of Mathematics and Physics Jiangsu University of Technology ChangzhouJiangsu 213001China

Let H be a finite-dimensional pointed Hopf algebra of rank one over an algebraically closed feld of characteristic *** describe all annihilator ideals of indecomposable H-modules by *** particular,we give the classification of all ideals of the finite-dimensional pointed rank one Hopf algebra of nilpotent type over the Klein 4-group.

关键词： indecomposable module annihilator ideal primitive central orthogonal idem-potent element

Aldo-keto reductase family member C3(AKR1C3)promotes hepatocellular carcinoma cell growth by producing prostaglandin F2α

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Oncology Research 2024年第1期32卷 163-174页

作者： KUO-SHYANG JENG po-yu CHENG yuEH-HSIEN LIN po-CHUN LIU PING-HUI TSENG yu-CHAO wang CHIUNG-FANG CHANG CHUEN-MIIN LEU Division of General Surgery Far Eastern Memorial HospitalNew Taipei City22060Taiwan Institute of Microbiology and Immunology National Yang Ming Chiao Tung UniversityTaipei City11221Taiwan Institute of Biochemistry and Molecular Biology National Yang Ming Chiao Tung UniversityTaipei City11221Taiwan Institute of Biomedical Informatics National Yang Ming Chiao Tung UniversityTaipei City11221Taiwan Department of Medical Research Far Eastern Memorial HospitalNew Taipei City22060Taiwan

Hepatocellular carcinoma(HCC)is a leading cause of death *** therapies are effective for HCC patients with early disease,but many patients suffer recurrence after surgery and have a poor response to ***,new therapeutic targets are *** analyzed gene expression profiles between HCC tissues and normal adjacent tissues from public databases and found that the expression of genes involved in lipid metabolism was significantly *** analysis showed that AKR1C3 was upregulated in tumors,and high AKR1C3 expression was associated with a poorer prognosis in HCC *** vitro,assays demonstrated that the knockdown of AKR1C3 or the addition of the AKR1C3 inhibitor indomethacin suppressed the growth and colony formation of HCC cell *** of AKR1C3 in Huh7 cells reduced tumor growth in *** explore the mechanism,we performed pathway enrichment analysis,and the results linked the expression of AKR1C3 with prostaglandin F2 alpha(PGF2a)downstream target *** of AKR1C3 activity reduced the production of PGF2a,and supplementation with PGF2a restored the growth of indomethacin-treated Huh7 *** of the PGF receptor(PTGFR)and treatment with a PTGFR inhibitor significantly reduced HCC *** showed that indomethacin potentiated the sensitivity of Huh7 cells to *** summary,our results indicate that AKR1C3 upregulation may promote HCC growth by promoting the production of PGF2α,and suppression of PTGFR limited HCC ***,targeting the AKR1C3-PGF2a-PTGFR axis may be a new strategy for the treatment of HCC.

关键词： Hepatocellular carcinoma Aldo-keto reductase family member C3 Prostaglandin F2 alpha Prostaglandin F receptor

Immersive visualization of 3D subsurface ground model developed from sparse boreholes using virtual reality(VR)

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Underground Space 2024年第4期17卷 188-206页

作者： Borui Lyu yu wang Department of Architecture and Civil Engineering City University of Hong KongKowloon 999077Hong KongChina

Analytics and visualization of multi-dimensional and complex geo-data,such as three-dimensional(3D)subsurface ground models,is critical for development of underground space and design and construction of underground structures(e.g.,tunnels,dams,and slopes)in engineering *** complicated 3D subsurface ground models now can be developed from site investigation data(e.g.,boreholes)which is often sparse in practice,it remains a great challenge to visualize a 3D subsurface ground model with sophisticated stratigraphic variations by conventional two-dimensional(2D)geological *** reality(VR)technology,which has an attractive capability of constructing a virtual environment that links to the physical world,has been rapidly developed and applied to visualization in various disciplines *** on the rapid development of VR,this study proposes a framework for immersive visualization of 3D subsurface ground models in geo-applications using VR *** 3D subsurface model is first developed from limited borehole data in a data-driven ***,a VR system is developed using related software and hardware devices currently available in the markets for immersive visualization and interaction with the developed 3D subsurface ground *** results demonstrate that VR visualization of the 3D subsurface ground model in an immersive environment has great potential in revolutionizing the geo-practices from 2D cross-sections to a 3D immersive virtual environment in digital era,particularly for the emerging digital twins.

关键词： Immersive visualization 3D subsurface model Virtual reality Virtual environment Interaction

Recent progress in all-inorganic tin-based perovskite solar cells:a review

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Science China Chemistry 2024年第4期67卷 1117-1136页

作者： Minghao wang yu Shi School of Electronics and Information Engineering Wuxi UniversityWuxi 214105China Institute of Advanced Materials Nanjing Tech UniversityNanjing 211816China

Recently,power conversion efficiency(PCE)of organic-inorganic hybrid perovskite solar cells(PSCs)has been improved to26.1%.However,the toxicity issue of lead still hinders the large-scale commercial production and application of lead(Pb)-based halide ***,environmentally friendly tin(Sn)-based perovskites have recently shown excellent *** them,the all-inorganic Sn-based perovskites,including CsSnX_(3) and Cs_(2)SnX_(6),have better stability,more suitable bandgap,and higher charge mobility,which have attracted more attention from researchers than organic-inorganic Sn-based hybrid ***,we review recent research progress on all-inorganic Sn-based perovskite materials and corresponding solar cell ***,we also summarize the current challenges and future research directions for this type of PSCs.

关键词： solar cells perovskite all-inorganic CsSnX_(3) Cs_(2)SnX_(6)