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Novel Design Method for the Roll Forming Process and Improved Forming Quality of 316L Stainless Steel BPP Flow Channels with Right-Angled Sidewalls 认领 引用
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作者 Fuqiang Zhao Hugang Tian +4 位作者 Qingxue Huang Yanlei Zhang Xiaolong Xie Zhigang Qi Shuaifeng Chen 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2025年第2期163-182,共20页
The forming quality of metal bipolar plate(BPP)flow channels in proton exchange membrane fuel cells(PEMFCs)is a key factor affecting battery performance.A flow channel with straight sidewalls and a low thinning rate c... The forming quality of metal bipolar plate(BPP)flow channels in proton exchange membrane fuel cells(PEMFCs)is a key factor affecting battery performance.A flow channel with straight sidewalls and a low thinning rate can enhance battery output.Roll forming,as a new technology for BPP production,offers advantages such as a low thinning rate and high efficiency.However,existing roll curve design methods struggle to accommodate both low thinning rates and straight sidewall angles simultaneously.This study aims to develop flow channels with right-angled sidewalls,which provide benefits such as a low thinning rate,reduced residual stress,and high accuracy.A roller tooth profile was designed to achieve a flow channel with right-angled sidewalls and minimal thinning.Simulations and experiments were conducted to validate the feasibility of this novel design method for the roll forming process.The study investigated the effects of roller tooth parameters on sidewall angle,thinning rate,and residual stress.A multifactor evaluation method was developed to optimize the tip fillet radius and the tooth profile backlash of the roller.The results indicated that the tip fillet radius and the tooth profile backlash were negatively correlated with the sidewall angle.As the tip fillet radius and tooth profile backlash increased,the thinning rate and residual stress decreased.With a tip fillet radius of 0.25 mm and a tooth profile backlash of 0.19 mm,the flow channel achieved an approximately right-angled sidewall,a maximum thinning rate of 7.7%,a 29.6%reduction in maximum residual stress,and maximum and average residual stress imbalance values of 7.1%and 3.2%,respectively.This study proposes a new design method for a right-angled sidewall runner roller gear profile,facilitating the roll forming of metal BPPs with right-angled sidewalls and minimal thinning.This method provides theoretical support for the large-scale application of roll forming in the manufacture of PEMFC BPPs. 展开更多
关键词 Proton exchange membrane fuel cell 316L stainless steel bipolar plate Roll forming process Roller tooth profile design Flow channel with right-angled sidewall Residaul stress
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Shadow-Assisted Sidewall Emission for Achieving Submicron Linewidth Light Source by Using Normal UV Photolithography 认领 引用
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作者 Junlong Li Yanmin Guo +7 位作者 Kun Wang Wei Huang Hao Su Wenhao Li Xiongtu Zhou Yongai Zhang Tailiang Guo Chaoxing Wu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2025年第10期49-62,共14页
Micro light sources are crucial tools for studying the interactions between light and matter at the microanoscale,encompassing diverse applications across multiple disciplines.Despite numerous studies on reducing the ... Micro light sources are crucial tools for studying the interactions between light and matter at the microanoscale,encompassing diverse applications across multiple disciplines.Despite numerous studies on reducing the size of micro light sources and enhancing optical resolution,the efficient and simple fabrication of ultra-high-resolution micro light sources remains challenging due to its reliance on precise micro-nano processing technology and advanced processing equipment.In this study,a simple approach for the efficient fabrication of submicron light sources is proposed,namely shadow-assisted sidewall emission(SASE)technology.The SASE utilizes the widely adopted UV photolithography process,employing metal shadow modulation to precisely control the emission of light from polymer sidewalls,thereby obtaining photoluminescent light sources with submicron line widths.The SASE eliminates the need for complex and cumbersome manufacturing procedures.The effects of process parameters,including exposure dose,development time,and metal film thickness,on the linewidth of sources are investigated on detail.It is successfully demonstrated red,green,and blue submicron light sources.Finally,their potential application in the field of optical anti-counterfeiting is also demonstrated.We believe that the SASE proposed in this work provides a novel approach for the preparation and application of micro light sources. 展开更多
关键词 Submicron light source Quantum dot Photoluminescence Photolithography Shadow-assisted sidewall emission
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A numerical model for bird strike on sidewall structure of an aircraft nose 认领 引用 被引量：6
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作者 Liu Jun Li Yulong +1 位作者 Gao Xiaosheng Yu Xiancheng 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2014年第3期542-549,共8页
In order to examine the potential of using the coupled smooth particles hydrodynamic （SPH） and finite element （FE） method to predict the dynamic responses of aircraft structures in bird strike events, bird-strike ... In order to examine the potential of using the coupled smooth particles hydrodynamic （SPH） and finite element （FE） method to predict the dynamic responses of aircraft structures in bird strike events, bird-strike tests on the sidewall structure of an aircraft nose are carried out and numerically simulated. The bird is modeled with SPH and described by the Murnaghan equation of state, while the structure is modeled with finite elements. A coupled SPH-FE method is developed to simulate the bird-strike tests and a numerical model is established using a commercial software PAM-CRASH. The bird model shows no signs of instability and correctly modeled the break-up of the bird into particles. Finally the dynamic response such as strains in the skin is simulated and compared with test results, and the simulated deformation and fracture process of the sidewall structure is compared with images recorded by a high speed camera. Good agreement between the simulation results and test data indicates that the coupled SPH-FE method can provide a very powerful tool in predicting the dynamic responses of aircraft structures in events of bird strike. 展开更多
关键词 Bird strike Experiment Sidewall structure Simulation Smooth particles hydrodynamic （SPH） method
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31.38 Gb/s GaN-based LED array visible light communication system enhanced with V-pit and sidewall quantum well structure 认领 引用 被引量：11
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作者 Zengyi Xu Wenqing Niu +12 位作者 Yu Liu Xianhao Lin Jifan Cai Jianyang Shi Xiaolan Wang Guangxu Wang Jianli Zhang Fengyi Jiang Zhixue He Shaohua Yu Chao Shen Junwen Zhang Nan Chi 《Opto-Electronic Science》 2023年第5期12-24,共13页
Although the 5G wireless network has made significant advances,it is not enough to accommodate the rapidly rising requirement for broader bandwidth in post-5G and 6G eras.As a result,emerging technologies in higher fr... Although the 5G wireless network has made significant advances,it is not enough to accommodate the rapidly rising requirement for broader bandwidth in post-5G and 6G eras.As a result,emerging technologies in higher frequencies including visible light communication(VLC),are becoming a hot topic.In particular,LED-based VLC is foreseen as a key enabler for achieving data rates at the Tb/s level in indoor scenarios using multi-color LED arrays with wavelength division multiplexing(WDM)technology.This paper proposes an optimized multi-color LED array chip for high-speed VLC systems.Its long-wavelength GaN-based LED units are remarkably enhanced by V-pit structure in their efficiency,especially in the“yellow gap”region,and it achieves significant improvement in data rate compared with earlier research.This work investigates the V-pit structure and tries to provide insight by introducing a new equivalent circuit model,which provides an explanation of the simulation and experiment results.In the final test using a laboratory communication system,the data rates of eight channels from short to long wavelength are 3.91 Gb/s,3.77 Gb/s,3.67 Gb/s,4.40 Gb/s,3.78 Gb/s,3.18 Gb/s,4.31 Gb/s,and 4.35 Gb/s(31.38 Gb/s in total),with advanced digital signal processing(DSP)techniques including digital equalization technique and bit-power loading discrete multitone(DMT)modulation format. 展开更多
关键词 GaN-based LED LED array VLC V-pit sidewall quantum well high-frequency response
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ANALYSIS OF INTERNAL WAVERIDER INLET AND TYPICAL SIDEWALL COMPRESSION INLET PERFORMANCE 认领 引用 被引量：3
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作者 黄国平 朱呈祥 +1 位作者 尤延铖 周淼 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2011年第1期120-128,共9页
A new internal waverider inlet with a rectangular shape of entrance and exit in front view is designed at Ma=6.0.The design is based on a better basic flowfield ICFC than traditional one and derived with the technolog... A new internal waverider inlet with a rectangular shape of entrance and exit in front view is designed at Ma=6.0.The design is based on a better basic flowfield ICFC than traditional one and derived with the technology of stream tracing and shock cutting.Comparison between the newly designed inlet and a typical sidewall compression inlet is given.The design Mach number and entrance shape of this new inlet are chosen according to the sidewall compression inlet.Numerical results show that most of the performance parameters of the internal waverider inlet are a bit higher than the sidewall inlet,such as the flow capture coefficient,total pressure recovery and the kinetic efficiency.The performances of these two inlets at off-design points are compared.The internal waverider inlet can capture more than 91% of incoming flow under all simulated conditions.Results show that internal waverider inlet using 3-D compression and high flow capture coefficient is a kind of fixed-geometry inlet with better performance. 展开更多
关键词 hypersonic performance internal waverider inlet sidewall compression inlet
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Experimental study on thermal environment in large-space building with low sidewall air supply 认领 引用 被引量：2
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作者 黄晨 刘稳 +2 位作者 邹志军 任荣 陈雷 《Journal of Southeast University(English Edition)》 EI CAS 2010年第2期270-273,共4页
The thermal environmental characteristics are experim-entally studied in terms of different air supply volumes and outdoor meteorological parameters in a large-space building which is air conditioned with a low sidewa... The thermal environmental characteristics are experim-entally studied in terms of different air supply volumes and outdoor meteorological parameters in a large-space building which is air conditioned with a low sidewall air supply.The experimental results show that the indoor vertical temperature distributions under different condition are similar.The maximum vertical temperature difference（MVTD）is up to about 20 ℃,and it linearly changes with the sol-air temperature.The indoor vertical temperature gradients（VTGs）in the upper,central and lower zones are different.The influence of the sol-air temperature on the VTGs in the upper and the lower zones is greater than that in the central zone.The characteristics of the VTGs in the three zones affected by the air supply volume are the same as those affected by the sol-air temperature.Besides,because of the small air velocity,the predicted mean vote（PMV）on comfort in the occupied zone is slightly high and the air temperature difference between the head and the ankle is usually more than 3 ℃. 展开更多
关键词 large space building low sidewall air supply vertical temperature gradient thermal environment
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Numerical Simulation of PMM Tests for A Ship in Close Proximity to Sidewall and Maneuvering Stability Analysis 认领 引用 被引量：2
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作者 刘晗 马宁 顾解忡 《China Ocean Engineering》 SCIE EI CSCD 2016年第6期884-897,共14页
As the maneuverability of a ship navigating close to a bank is influenced by the sidewall, the assessment of ship maneuvering stability is important. The hydrodynamic derivatives measured by the planar motion mechani... As the maneuverability of a ship navigating close to a bank is influenced by the sidewall, the assessment of ship maneuvering stability is important. The hydrodynamic derivatives measured by the planar motion mechanism （PMM） test provide a way to predict the change of ship maneuverability. This paper presents a numerical simulation of PMM model tests with variant distances to a vertical bank by using unsteady RANS equations. A hybrid dynamic mesh technique is developed to realize the mesh configuration and remeshing of dynamic PMM tests when the ship is close to the bank. The proposed method is validated by comparing numerical results with results of PMM tests in a circulating water channel. The first-order hydrodynamic derivatives of the ship are analyzed from the time history of lateral force and yaw moment according to the multiple-run simulating procedure and the variations of hydrodynamic derivatives with the ship-sidewall distance are given. The straight line stability and directional stability are also discussed and stable or unstable zone of proportional-derivative （PD） controller parameters for directional stability is shown, which can be a reference for course keeping operation when sailing near a bank. 展开更多
关键词 sidewall effect numerical simulation planar motion mechanism （PMM） hybrid dynamic mesh technique ship maneuvering stability
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A New Arrangement with Nonlinear Sidewalls for Tanker Ship Storage Panels 认领 引用 被引量：3
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作者 M. J. Ketabdari H. Saghi 《Journal of Ocean University of China》 SCIE CAS 2013年第1期23-31,共9页
Sloshing phenomenon in a moving container is a complicated free surface flow problem. It has a wide range of engineering applications, especially in tanker ships and Liquefied Natural Gas (LNG) carriers. When the tank... Sloshing phenomenon in a moving container is a complicated free surface flow problem. It has a wide range of engineering applications, especially in tanker ships and Liquefied Natural Gas (LNG) carriers. When the tank in these vehicles is partially filled, it is essential to be able to evaluate the fluid dynamic loads on tank perimeter. Different geometric shapes such as rectangular, cylindrical, elliptical, spherical and circular conical have been suggested for ship storage tanks by previous researchers. In this paper a numerical model is developed based on incompressible and inviscid fluid motion for the liquid sloshing phenomenon. The coupled BEM-FEM is used to solve the governing equations and nonlinear free surface boundary conditions. The results are validated for rectangular container using data obtained for a horizontal periodic sway motion. Using the results of this model a new arrangement of trapezoidal shapes with quadratic sidewalls is suggested for tanker ship storage panels. The suggested geometric shape not only has a maximum surrounded tank volume to the constant available volume, but also reduces the sloshing effects more efficiently than the existing geometric shapes. 展开更多
关键词 tanker ships storage panels sloshing phenomenon quadratic sidewalls
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A novel conformationally adaptive macrocyclic tetramaleimide with flipping pyrene sidewalls 认领 引用 被引量：1
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作者 Lingyun Zhu Wei Zeng +1 位作者 Menghua Li Meijin Lin 《Chinese Chemical Letters》 SCIE CAS CSCD 2022年第1期229-233,共5页
The synthesis,structure,and properties of pyrene-based conformationally adaptive macrocycles are described.This new type of conformationally adaptive macrocycle was constructed through Perkin reaction,followed by imid... The synthesis,structure,and properties of pyrene-based conformationally adaptive macrocycles are described.This new type of conformationally adaptive macrocycle was constructed through Perkin reaction,followed by imidization.By changing the condensation partner as the linking unit,a family of conjugated macrocycles with different sizes of the cavity was synthesized,which provide a simple and modular synthetic strategy towards the conformationally adaptive macrocycles.Furthermore,the macrocycles provide two well-defined conformations through flipping pyrene subunit,which were unambiguously determined by single-crystal X-ray diffraction analysis.The conformational interconversion barrier was determined by density functional theory(DFT)calculations.This new macrocycle also demonstrated unique properties,such as vapochromic behavior and aggregation emission enhancement effect.Furthermore,we have also investigated the effect of the linker on the shape and photophysical properties of the resulting macrocyclic products. 展开更多
关键词 AEE Conjugated macrocycles DFT Flipping sidewalls Vapochromic
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Small-scale fire tests in the underwater tunnel section model with new sidewall smoke extraction 认领 引用
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作者 Shunyu Yue Ruifeng Miao +2 位作者 Huihang Cheng Maohua Zhong Xiujun Yang 《Deep Underground Science and Engineering》 2024年第2期247-254,共8页
The Shenzhen–Zhongshan Bridge is a 24‐km‐long bridge and tunnel system,including a 6.8-km-long super cross section subsea tunnel.To solve the smoke exhaust problem of a super large cross-section subsea tunnel,the t... The Shenzhen–Zhongshan Bridge is a 24‐km‐long bridge and tunnel system,including a 6.8-km-long super cross section subsea tunnel.To solve the smoke exhaust problem of a super large cross-section subsea tunnel,the tunnel has a new smoke exhaust system that combines a horizontal smoke exhaust cross section at the top and sidewall smoke exhaust holes.In order to evaluate the potential fire hazards of this type of tunnel,a 1:30 tunnel model was established and 140 smallscale experiments on underwater tunnel fires were conducted.By changing the fire power,fire location,and fan operation mode,different scenarios of submarine immersed tunnel fire were simulated and the related key parameters such as fire smoke diffusion behavior and smoke temperature distribution were studied.On this basis,the optimal smoke control strategy was proposed for different fire scenarios.The research results indicate that the new smoke exhaust system can fully utilize the smoke flow characteristics,significantly improve smoke exhaust efficiency,and increase available evacuation time,thus further enhancing the fire safety of super large cross-section subsea tunnels. 展开更多
关键词 sidewall smoke extraction system small‐scale fire tests smoke control
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Experimental Investigation of Flame Structure and Combustion Limit During Premixed Methane/Air Jet Flame and Sidewall Interaction 认领 引用 被引量：1
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作者 Ying Chen Jianfeng Pan +2 位作者 Qingbo Lu Yu Wang Chenxin Zhang 《Energy Engineering》 EI 2021年第1期37-52,共16页
The effects of inlet gas parameters and sloping sidewall angle on the flame structure and combustion limit with and without sidewall were experimentally investigated.Flame height and impact angle were obtained by chem... The effects of inlet gas parameters and sloping sidewall angle on the flame structure and combustion limit with and without sidewall were experimentally investigated.Flame height and impact angle were obtained by chemiluminescence intensity analysis of CH*distribution.First,the combustion characteristics of flame with and without sidewall at different equivalence ratios were explored;then,the influence of Reynolds number and inlet gas temperature on flame structure and combustion limit of v-shaped flame with sidewall were analyzed,and the results with sidewall were compared with those without sidewall.Finally,the variation trend of flame parameters with different sloping sidewall angles was analyzed.The experimental results show that the existence of sidewall makes flame shape change from“M-shaped”to“inverted N-shaped”,and conical shape to trapezoidal shape.The inhibition effect of sidewall on flame stretching downstream is strengthened with the increase in Reynolds number;but as the temperature of the inlet gas increases,the inhibitory effect is obviously weakened.When sloping sidewall angle decreases from 90°to 55°at 5°intervals,flame height and impact angle of v-shaped flame reach the extreme value whenβ=80°.Compared with the case without sidewall,the range of v-shaped flame with sidewall has no obvious trend of broadening or shrinking when inlet gas temperature is increased;however,as sloping sidewall angle decreases,the range of the v-shaped flame shrinks obviously and flammability limit increases significantly. 展开更多
关键词 Sidewall premixed flame flame-wall interaction flame structure combustion limit
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Study on mechanical principle of reinforcing sidewalls and corners of roadway to control floor heave by anchors 认领 引用 被引量：4
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作者 王卫军 《Journal of Coal Science & Engineering(China)》 2003年第1期17-21,共5页
The movement principle of sidewalls and floor of extraction opening is analyzed, it is found that floor heave not only has something to do with the floor strata, but sidewalls. The effect of sidewall anchor and corner... The movement principle of sidewalls and floor of extraction opening is analyzed, it is found that floor heave not only has something to do with the floor strata, but sidewalls. The effect of sidewall anchor and corner anchor is studied, the mechanical principle of reinforcing sidewalls and corners is put forward and applied in engineering practice. 展开更多
关键词 sidewalls and corners anchor reinforcing floor heave control mechanical principle
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SIDEWALL FLOW STABILITY IN THE MHD CHANNEL FLOWS 认领 引用 被引量：1
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作者 徐复 《Acta Mechanica Sinica》 SCIE EI CAS 1996年第2期97-103,共7页
The velocity distribution between two sidewalls is; M-shaped for the MHD channel flows with rectangular cross section and thin conducting walls in a strong transverse magnetic field. Assume that the dimensionless numb... The velocity distribution between two sidewalls is; M-shaped for the MHD channel flows with rectangular cross section and thin conducting walls in a strong transverse magnetic field. Assume that the dimensionless numbers R(m) much less than 1, M, N much greater than 1, and sigma* much less than 1 and that the distance between two perpendicular walls is very long in comparison with the distance between two sidewalls. First, the equation for steady flow is established, and the solution of M-shaped velocity distribution is given. Then, an equation for stability of small disturbances is derived based on the velocity distribution obtained. Finally, it is proved that the stability equation for sidewall how can be transformed into the famous Orr-Sommerfeld equation, in addition, the following theorems are also proved, namely, the analogy theorem, the generalized Rayleigh's theorem, the generalized Fjortoft's theorem and the generalized Joseph's theorems. 展开更多
关键词 MHD channel flow sidewall flow flow stability
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Fixture Locating Modelling and Optimization Research of Aluminum Alloy Sidewall in a High-Speed Train Body 认领 引用
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作者 WANG Xianjin GAO Xu YU Kuigang 《Journal of Shanghai Jiaotong university(Science)》 EI 2020年第6期706-713,共8页
The high-speed train body is welded with aluminum alloy assemblies or parts.Due to the material properties,the welding deformation is much significant.In order to control the welding deformation,this paper takes the s... The high-speed train body is welded with aluminum alloy assemblies or parts.Due to the material properties,the welding deformation is much significant.In order to control the welding deformation,this paper takes the sidewall welding of a high-speed train body as the research objective,and carries out the fixture locating modelling and optimization research of the aluminum alloy sidewall.Firstly,a finite element model of the sidewall is established and verified by the comparison between the analysis results and the actual measurement data.Then the residual stress and deformation of the sidewall after welding are analyzed.By selecting the longitudinal parameters of different fixture locating layouts for welding analysis,models describing the relat ionship between the maximum welding residual stress and maximum welding deformation and the longitudinal fixture locating distance of the sidewall are established.Finally,the fixture locating model of welding deformation is used to optimize the longit udinal fixture locating distance.And the transverse fixture locating distance is also optimized by comparing different locating positions.The result shows that the welding residual stress and the welding deformation have been decreased in the optimal fixture locat ing layout. 展开更多
关键词 aluminum alloy sidewall welding residual stress welding deformation fixture design
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Research and application of sidewall stability predic-tion method based on analytic hierarchy process and fuzzy integrative evaluation method 认领 引用 被引量：3
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作者 Bin Liu Fanjun Kong 《Natural Science》 2012年第2期142-147,共6页
As a difficult problem, sidewall instability has been beset drilling workers all the time. Not only does it cause huge economic losses, but also it determines the success or failure of drilling engineering. Due to com... As a difficult problem, sidewall instability has been beset drilling workers all the time. Not only does it cause huge economic losses, but also it determines the success or failure of drilling engineering. Due to complex relationship between various factors which influence sidewall stability, it hasn’t been found a widely applied method to predicate sidewall stability so far. Therefore, in order to formulate corresponding measures to ensure successful drilling, searching for a kind of better method to forecast sidewall stability before drilling becomes an imperative and significant topic for drilling engineering. On the basis of traditional sidewall stability analytical method, we have put forward the Fuzzy Comprehensive Evaluation Method to forecast sidewall stability regulation using physico-chemical performance parameters of the clay mineral. This method has been improved by introducing the Analytic Hierarchy Process (AHP) and the Maximum Subjection Principle in the application process. After introducing Analytic Hierarchy Process to identify weight, and Maximum Subjection Principle to obtain evaluation results, it has reduced the influence of human factors and enhanced the accuracy of the fuzzy evaluation results. The application in Hailaer Area indicates that this method can predict sidewall stability of gas-oil well with high credibility and strong practicability. 展开更多
关键词 Instability of Sidewall Forecast Fuzzy Integrative Evaluation Method Analytic Hierarchy Process Maximum Subjection Principle
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Thermal stratification level of low sidewall air supply with air-conditioning system in large space 认领 引用 被引量：3
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作者 黄晨 蔡宁 高雪垒 《Journal of Central South University》 SCIE EI CAS 2009年第S1期166-170,共5页
The thermal stratification level of low sidewall air supply system in large space was defined. Depending on the experiment of low sidewall air supply in summer 2008,the thermal stratification level was studied by simu... The thermal stratification level of low sidewall air supply system in large space was defined. Depending on the experiment of low sidewall air supply in summer 2008,the thermal stratification level was studied by simulation. Based on the simulation of experiment condition,the air velocity and vertical temperature distribution in a large space were simulated at different air-outlet velocities,and then the thermal stratification level line was obtained. The simulation results well match with the experimental ones and the average relative error is 3.4%. The thermal stratification level is heightened by increasing the air-outlet velocity with low sidewall air supply mode. It is concluded that when air-outlet velocity is 0.29 m/s,which is the experimental case,a uniform thermal environment in the higher occupied zone and a stable stratification level are formed. When the air-outlet velocity is low,such as 0.05 m/s,the thermal stratification level is too low and the air velocity is too small to meet the human thermal comfort in the occupied zone. So,it would be reasonable that the air-outlet velocity may be designed as 0.31 m/s if the height of the occupied zone is 2 m. 展开更多
关键词 large space low sidewall air supply thermal stratification level numerical simulation air-outlet velocity
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Advanced technologies in InGaN micro-LED fabrication to mitigate the sidewall effect 认领 引用 被引量：3
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作者 Zhiyuan Liu Haicheng Cao +5 位作者 Xiao Tang Tingang Liu Yi Lu Zixian Jiang Na Xiao Xiaohang Li 《Light: Science & Applications》 SCIE EI CAS CSCD 2025年第2期307-332,共26页
The size of InGaN micro-LEDs is continuously decreasing to meet the demands of various emerging applications,especially in tiny micro-displays such as ARVR.However,the conventional pixel definition based on plasma etc... The size of InGaN micro-LEDs is continuously decreasing to meet the demands of various emerging applications,especially in tiny micro-displays such as ARVR.However,the conventional pixel definition based on plasma etching significantly damages the mesa sidewalls,leading to a severe reduction in efficiency as the micro-LED size decreases.This seriously impedes the development and application of micro-LEDs.In this work,we comprehensively explain the origin of micro-LED sidewall effects and corresponding physical models.Subsequently,we systematically review recent progress in micro-LED fabrication aiming at suppressing sidewall effects.Furthermore,we discuss advancements in micro-LED fabrication with"damage-free"techniques,which hold the potential to fundamentally address the issue of plasma damage in the micro-LED process.We believe this review will deepen the understanding of micro-LED sidewall effects and provide a better insight into the latest associated fabrication technologies for high-efficientInGaNmicro-LEDs. 展开更多
关键词 plasma etching mesa sidewallsleading sidewall effect pixel definition advanced technologies reduction efficiency
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On-chip microresonator dispersion engineering via segmented sidewall modulation 认领 引用 被引量：1
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作者 MASOUD KHEYRI SHUANGYOU ZHANG +14 位作者 TOBY BI ARGHADEEP PAL HAO ZHANG YAOJING ZHANG ABDULLAH ALABBADI HAOCHEN YAN ALEKHYA GHOSH LEWIS HILL PABLO BIANUCCI EDUARD BUTZEN FLORENTINA GANNOTT ALEXANDER GUMANN IRINA HARDER OLGA OHLETZ PASCAL DEL’HAYE 《Photonics Research》 SCIE EI CAS CSCD 2025年第2期367-372,共6页
Microresonator dispersion plays a crucial role in shaping the nonlinear dynamics of microcavity solitons.Here,we introduce and validate a method for dispersion engineering through modulating a portion of the inner edg... Microresonator dispersion plays a crucial role in shaping the nonlinear dynamics of microcavity solitons.Here,we introduce and validate a method for dispersion engineering through modulating a portion of the inner edge of ring waveguides.We demonstrate that such partial modulation has a broadband effect on the dispersion profile,whereas modulation on the entire resonator's inner circumference leads to mode splitting primarily affecting one optical mode.The impact of spatial modulation amplitude,period,and number of modulations on the mode splitting profile is also investigated.Through the integration of four modulated sections with different modulation amplitudes and periods,we achieve mode splitting across more than 50 modes over a spectral range exceeding 100 nm in silicon nitride resonators.These results highlight both the simplicity and efficacy of our method in achieving flatter dispersion profiles. 展开更多
关键词 modulating portion inner edge ring waveguideswe dispersion engineering microresonator dispersion shaping nonlinear dynamics sidewall modulation microresonator mode splitting microcavity solitonsherewe
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Self-air-cooling Design and Optimization for an Outer-rotor PMSG in External Still Air 认领 引用
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作者 Sirui Wang Fangrui Wei +3 位作者 Yong Li Jianhui Hu Qian Wang Pengcheng Ma 《CES Transactions on Electrical Machines and Systems》 EI CSCD 2026年第1期55-63,共9页
For hybrid-electric unmanned aerial vehicles(UAVs),the stable power supply from the onboard permanent magnet synchronous generator(PMSG)is critical.Overheating in the confined compartment can directly lead to power in... For hybrid-electric unmanned aerial vehicles(UAVs),the stable power supply from the onboard permanent magnet synchronous generator(PMSG)is critical.Overheating in the confined compartment can directly lead to power interruption and system failure.Therefore,proactively improving the thermal management is not only a key technical prerequisite for ensuring flight reliability and mission success,but also enhances the machine’s efficiency and the overall power density of the system.Targeting the stringent spatial constraints in UAV applications,novel self-air-cooling heat dissipation topologies are investigated and highlighted on the rotor sidewall for compact outer-rotor generators.A systematic optimization framework,centered on a multi-objective genetic algorithm,is developed to Pareto-optimize the fin geometries,balancing thermal performance against aerodynamic penalty.The proposed topologies are innovatively deployed on the rotor sidewall,uniquely combining the structural space of an outer-rotor machine with self-air-cooling to generate directed airflow of varying patterns that directly enhance the cooling efficiency of the stator.The parameters of the designed self-air-cooled heat dissipation topologies are optimized via a multi-objective genetic algorithm.A temperature rise test under windless conditions shows that the proposed self-air-cooled structure reduces the stator temperature of the generator by 37.1℃at 5000 r/min,confirming the effectiveness and engineering feasibility for practical applications. 展开更多
关键词 External still air Hybrid power system Heat dissipation structures Outer-rotor permanent magnet synchronous generator(PMSG) Rotor sidewall Self-air-cooling Unmanned aerial vehicles(UAVs)
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Effect of strata restraint on seismic performance of prefabricated sidewall joints in fabricated subway stations 认领 引用 被引量：3
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作者 Hua-Fei HE Zhao-Ping LI +1 位作者 Shao-Lin MA Xiang-Yang CUI 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2023年第5期763-779,共17页
A disadvantage of the conventional quasi-static test method is that it does not consider the soil restraint effect.A new method to test the seismic performance of prefabricated specimens for underground assembled stru... A disadvantage of the conventional quasi-static test method is that it does not consider the soil restraint effect.A new method to test the seismic performance of prefabricated specimens for underground assembled structures is proposed,which can realistically reflect the strata restraint effect on the underground structure.Laboratory work combined with finite element(FE)analysis is performed in this study.Three full-scale sidewall specimens with different joint forms are designed and fabricated.Indices related to the seismic performance and damage modes are analyzed comprehensively to reveal the mechanism of the strata restraint effect on the prefabricated sidewall components.Test results show that the strata restraint effect effectively improves the energy dissipation capacity,load-bearing capacity,and the recoverability of the internal deformation of the precast sidewall components.However,the strata restraint effect reduces the ductility of the precast sidewall components and aggravates the shear and bending deformations in the core region of the connection joints.Additionally,the strata restraint effect significantly affects the seismic performance and damage mode of the prefabricated sidewall components.An FE model that can be used to conduct a seismic performance study of prefabricated specimens for underground assembled structures is proposed,and its feasibility is verified via comparison with test data. 展开更多
关键词 underground structures precast sidewall specimen seismic test method bearing capacity energy dissipation capacity plastic deformation
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