Ghada Fatima Zahra Mebarki, Naima Benmostefa, Mohammed Feham, Mohammed Ayad Alkhafaji, Serge Dzo Mawuefa Afenyiveh, Younes Menni
This study addresses the challenge of mitigating electromagnetic interference (EMI) in telecommunications and radar systems by designing, simulating, and experimentally validating a wideband flexible metamaterial absorber (MMA) for gigahertz-frequency electromagnetic waves (EMWs). EMI is critical as it can severely impact the performance and reliability of electronic systems. Traditional absorbers often struggle to maintain high performance across a broad frequency range, especially under varying polarization and incidence angles. To address this issue, we developed a novel MMA with a simple, single-layer design optimized for wideband absorption over a 10 GHz frequency range. Constructed with a polyethylene terephthalate dielectric layer separating spiral coil resonators from a bottom copper layer, this configuration ensures polarization insensitivity for both transverse electric and transverse magnetic waves. Numerical simulations were used to optimize the design parameters, focusing on maximizing absorption efficiency across the targeted frequency range and varying incidence angles. Experimental validation was conducted to verify the absorber’s performance, with results showing excellent agreement with simulations. This research underscores the importance of experimental verification in validating the performance of MMAs and highlights their potential for real-world applications in absorbing EMWs.
{"title":"Design, simulation, and experimental validation of a wideband flexible metamaterial absorber for gigahertz electromagnetic waves","authors":"Ghada Fatima Zahra Mebarki, Naima Benmostefa, Mohammed Feham, Mohammed Ayad Alkhafaji, Serge Dzo Mawuefa Afenyiveh, Younes Menni","doi":"10.1063/5.0229586","DOIUrl":"https://doi.org/10.1063/5.0229586","url":null,"abstract":"This study addresses the challenge of mitigating electromagnetic interference (EMI) in telecommunications and radar systems by designing, simulating, and experimentally validating a wideband flexible metamaterial absorber (MMA) for gigahertz-frequency electromagnetic waves (EMWs). EMI is critical as it can severely impact the performance and reliability of electronic systems. Traditional absorbers often struggle to maintain high performance across a broad frequency range, especially under varying polarization and incidence angles. To address this issue, we developed a novel MMA with a simple, single-layer design optimized for wideband absorption over a 10 GHz frequency range. Constructed with a polyethylene terephthalate dielectric layer separating spiral coil resonators from a bottom copper layer, this configuration ensures polarization insensitivity for both transverse electric and transverse magnetic waves. Numerical simulations were used to optimize the design parameters, focusing on maximizing absorption efficiency across the targeted frequency range and varying incidence angles. Experimental validation was conducted to verify the absorber’s performance, with results showing excellent agreement with simulations. This research underscores the importance of experimental verification in validating the performance of MMAs and highlights their potential for real-world applications in absorbing EMWs.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"10 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
With the extensive proliferation of scanning probe microscopy (SPM)-related technologies, there is a growing demand for a fully customizable SPM controller. In response, we have developed an SPM controller that allows users to incorporate additional functions using LabVIEW, a graphical programming language. This controller incorporates fundamental features such as one-dimensional and two-dimensional scanning, feedback control, and slope compensation. In addition, it includes capabilities to restrict the speed of probe movement and safeguard the probe. Our system consists of a host personal computer (PC) running the Windows operating system and a National Instruments Reconfigurable Input/Output board equipped with a field programmable gate array (FPGA). The FPGA supports real-time deterministic processing, including feedback and probe protection functions, operating asynchronously from the host PC through data exchange via direct memory access first-in-first-out. The system features a graphical user interface on the Windows OS, supplemented by a character-based user interface that utilizes command strings in JavaScript object notation format. Furthermore, we provide wrappers for these commands using the Python programming language. We anticipate that our fully customizable bare born package of LabVIEW-based controller will prove beneficial for researchers utilizing SPM and those managing instruments requiring scanning and feedback control.
{"title":"OpenLabSPM: Bare bone package of LabVIEW-based scanning probe microscope controller","authors":"Hikaru Nomura, Junsuke Yamanishi","doi":"10.1063/5.0211126","DOIUrl":"https://doi.org/10.1063/5.0211126","url":null,"abstract":"With the extensive proliferation of scanning probe microscopy (SPM)-related technologies, there is a growing demand for a fully customizable SPM controller. In response, we have developed an SPM controller that allows users to incorporate additional functions using LabVIEW, a graphical programming language. This controller incorporates fundamental features such as one-dimensional and two-dimensional scanning, feedback control, and slope compensation. In addition, it includes capabilities to restrict the speed of probe movement and safeguard the probe. Our system consists of a host personal computer (PC) running the Windows operating system and a National Instruments Reconfigurable Input/Output board equipped with a field programmable gate array (FPGA). The FPGA supports real-time deterministic processing, including feedback and probe protection functions, operating asynchronously from the host PC through data exchange via direct memory access first-in-first-out. The system features a graphical user interface on the Windows OS, supplemented by a character-based user interface that utilizes command strings in JavaScript object notation format. Furthermore, we provide wrappers for these commands using the Python programming language. We anticipate that our fully customizable bare born package of LabVIEW-based controller will prove beneficial for researchers utilizing SPM and those managing instruments requiring scanning and feedback control.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"23 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sadia Irshad, Shah Jahan, Afraz Hussain Majeed, Ehab Ghith, Mehdi Tlija, Atif Asghar, Nusrat Rehman
The objective of this research endeavor is to examine the properties of stagnation point flow in the presence of absorption, viscous dissipation, and internal thermal generation with respect to a shrinking surface. The resulting system of differential equations is notoriously challenging to solve analytically. The equations controlling the boundary layer flow were solved using a finite difference method. The analysis includes the examination of important physical quantities through the presentation of plots and tabulated values. Our findings reveal a strong connection between the presence of solutions for high shrinking parameters and the magnetic field that was applied. Temperatures increase when there is an increase in both Ec and α at the same time. These results also suggest a shallowing of the thermal boundary layer. As a result of these findings, it appears that temperature and thermal boundary layer thickness are sensitive to changes in these factors.
{"title":"Numerical investigation of stagnation point heat transfer with MHD effects using finite difference method: Analysis of thermal absorption and generation","authors":"Sadia Irshad, Shah Jahan, Afraz Hussain Majeed, Ehab Ghith, Mehdi Tlija, Atif Asghar, Nusrat Rehman","doi":"10.1063/5.0219843","DOIUrl":"https://doi.org/10.1063/5.0219843","url":null,"abstract":"The objective of this research endeavor is to examine the properties of stagnation point flow in the presence of absorption, viscous dissipation, and internal thermal generation with respect to a shrinking surface. The resulting system of differential equations is notoriously challenging to solve analytically. The equations controlling the boundary layer flow were solved using a finite difference method. The analysis includes the examination of important physical quantities through the presentation of plots and tabulated values. Our findings reveal a strong connection between the presence of solutions for high shrinking parameters and the magnetic field that was applied. Temperatures increase when there is an increase in both Ec and α at the same time. These results also suggest a shallowing of the thermal boundary layer. As a result of these findings, it appears that temperature and thermal boundary layer thickness are sensitive to changes in these factors.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"27 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
With the increasing integration levels of modern electronic products, effective thermal management has become a critical concern to ensure the operational efficiency and longevity of electronic devices. Developing thermal interface materials that possess both high thermal conductivity (κ) and reliable insulation properties has presented a significant challenge. In this study, boron nitride fibers (BNF) with a substantial length-to-diameter ratio were fabricated to serve as vertically aligned thermal conduction channels within a composite pad containing a silicone gel matrix.Under typical packing pressure conditions, the resulting BNF pad exhibits an exceptionally high through-plane thermal conductivity (40 vol. %: κ⊥ = 16.77 W/mK). Additionally, the BNF pad demonstrates favorable mechanical and dielectric properties, enhancing its versatility and applicability. The results of actual heat dissipation tests further validate the excellent thermal management capabilities of these composites in high-power electronic applications.
{"title":"Electrically insulating thermal interface material with ultrahigh thermal conductivity enabled by vertical boron nitride fibers","authors":"Haoran Yang, Yisimayili Tuersun, Pingjun Luo, Yixin Chen, Xu Huang, Qi Huang, Xuechen Chen, Sheng Chu","doi":"10.1063/5.0207569","DOIUrl":"https://doi.org/10.1063/5.0207569","url":null,"abstract":"With the increasing integration levels of modern electronic products, effective thermal management has become a critical concern to ensure the operational efficiency and longevity of electronic devices. Developing thermal interface materials that possess both high thermal conductivity (κ) and reliable insulation properties has presented a significant challenge. In this study, boron nitride fibers (BNF) with a substantial length-to-diameter ratio were fabricated to serve as vertically aligned thermal conduction channels within a composite pad containing a silicone gel matrix.Under typical packing pressure conditions, the resulting BNF pad exhibits an exceptionally high through-plane thermal conductivity (40 vol. %: κ⊥ = 16.77 W/mK). Additionally, the BNF pad demonstrates favorable mechanical and dielectric properties, enhancing its versatility and applicability. The results of actual heat dissipation tests further validate the excellent thermal management capabilities of these composites in high-power electronic applications.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"60 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Background: Lung cancer is a major health concern globally, being the primary cause of cancer-related deaths. It accounts for approximately one–sixth of all cancer fatalities. Objective: The goal of this study is to develop an effective method for the early detection of lung tumors using computed tomography (CT) images. This method aims to identify lung tumors of various sizes and shapes, which is a significant challenge due to the variability in tumor characteristics. Methods: The research utilizes CT images of the lungs in sagittal view from the LID-IDRI database. To tackle the issue of tumor variability in size, shape, and number, the study proposes a novel image processing technique. This technique involves detecting tumor clusters using a weighted average-based automatic thresholding method. This method focuses on maximizing inter-class variance and is supplemented by further classification and segmentation processes. Results: The proposed image processing technique was tested on a dataset of 315 lung CT images. It demonstrated a high level of accuracy, achieving a 98.96% success rate in identifying lung tumors. Conclusion: The study introduces a highly effective method for the detection of lung tumors in CT images, irrespective of their size and shape. The technique’s high accuracy rate suggests it could be a valuable tool in the early diagnosis of lung cancer, potentially leading to improved patient outcomes.
{"title":"Segmentation of lung nodules in CT images using weighted average based threshold and maximized variance","authors":"Yankun Liu, Tong Zhang, Ma Liang, Enguo Wang","doi":"10.1063/5.0216374","DOIUrl":"https://doi.org/10.1063/5.0216374","url":null,"abstract":"Background: Lung cancer is a major health concern globally, being the primary cause of cancer-related deaths. It accounts for approximately one–sixth of all cancer fatalities. Objective: The goal of this study is to develop an effective method for the early detection of lung tumors using computed tomography (CT) images. This method aims to identify lung tumors of various sizes and shapes, which is a significant challenge due to the variability in tumor characteristics. Methods: The research utilizes CT images of the lungs in sagittal view from the LID-IDRI database. To tackle the issue of tumor variability in size, shape, and number, the study proposes a novel image processing technique. This technique involves detecting tumor clusters using a weighted average-based automatic thresholding method. This method focuses on maximizing inter-class variance and is supplemented by further classification and segmentation processes. Results: The proposed image processing technique was tested on a dataset of 315 lung CT images. It demonstrated a high level of accuracy, achieving a 98.96% success rate in identifying lung tumors. Conclusion: The study introduces a highly effective method for the detection of lung tumors in CT images, irrespective of their size and shape. The technique’s high accuracy rate suggests it could be a valuable tool in the early diagnosis of lung cancer, potentially leading to improved patient outcomes.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"8 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xin Huang, Wenhao Zhao, Meisong Yuan, Kaixuan Sun, Bo Yang
Insect-electronics hybrid robots integrate live insects with small electronic backpacks. These backpacks guide insect movement and sense environmental data. Due to size and payload constraints, high-capacity batteries are impractical for prolonged energy supply. This study proposes a self-sustaining wireless sensing and flight control device with an energy management module and a Bluetooth slave module. This setup enables solar energy harvesting, wireless flight control of beetles, and the acquisition of image and attitude information. The device achieves directional flight control with a 72.5% success rate in turning. Operation duration increases by 46.6% in image-only mode and 50.9% in combined image and attitude angle mode under 20 000 lux indoor illuminance. Outdoor experiments demonstrate continuous operation at one image per second under favorable illuminance conditions, with a 92% increase in operation time when capturing images and yaw angles. This microelectronic device enhances the durability of insect robots during extended field missions, providing valuable insights into long-term environmental monitoring.
{"title":"A self-sustaining wireless sensing and flight control device for beetles","authors":"Xin Huang, Wenhao Zhao, Meisong Yuan, Kaixuan Sun, Bo Yang","doi":"10.1063/5.0228102","DOIUrl":"https://doi.org/10.1063/5.0228102","url":null,"abstract":"Insect-electronics hybrid robots integrate live insects with small electronic backpacks. These backpacks guide insect movement and sense environmental data. Due to size and payload constraints, high-capacity batteries are impractical for prolonged energy supply. This study proposes a self-sustaining wireless sensing and flight control device with an energy management module and a Bluetooth slave module. This setup enables solar energy harvesting, wireless flight control of beetles, and the acquisition of image and attitude information. The device achieves directional flight control with a 72.5% success rate in turning. Operation duration increases by 46.6% in image-only mode and 50.9% in combined image and attitude angle mode under 20 000 lux indoor illuminance. Outdoor experiments demonstrate continuous operation at one image per second under favorable illuminance conditions, with a 92% increase in operation time when capturing images and yaw angles. This microelectronic device enhances the durability of insect robots during extended field missions, providing valuable insights into long-term environmental monitoring.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"5 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. M. Losada, A. D. Helgeland, J. L. Terry, O. E. Garcia
Time delay and velocity estimation methods have been widely studied subjects in the context of signal processing, with applications in many different fields of physics. The velocity of waves or coherent fluctuation structures is commonly estimated as the distance between two measurement points divided by the time lag that maximizes the cross correlation function between the measured signals, but this is demonstrated to result in erroneous estimates for two spatial dimensions. We present an improved method to accurately estimate both components of the velocity vector, relying on three non-aligned measurement points. We introduce a stochastic process describing the fluctuations as a superposition of uncorrelated pulses moving in two dimensions. Using this model, we show that the three-point velocity estimation method, using time delays calculated through cross correlations, yields the exact velocity components when all pulses have the same velocity. The two- and three-point methods are tested on synthetic data generated from realizations of such processes for which the underlying velocity components are known. The results reveal the superiority of the three-point technique. Finally, we demonstrate the applicability of the velocity estimation on gas puff imaging data of strongly intermittent plasma fluctuations due to the radial motion of coherent, blob-like structures at the boundary of the Alcator C-Mod tokamak.
{"title":"A three-point velocity estimation method for two-dimensional coarse-grained imaging data","authors":"J. M. Losada, A. D. Helgeland, J. L. Terry, O. E. Garcia","doi":"10.1063/5.0197251","DOIUrl":"https://doi.org/10.1063/5.0197251","url":null,"abstract":"Time delay and velocity estimation methods have been widely studied subjects in the context of signal processing, with applications in many different fields of physics. The velocity of waves or coherent fluctuation structures is commonly estimated as the distance between two measurement points divided by the time lag that maximizes the cross correlation function between the measured signals, but this is demonstrated to result in erroneous estimates for two spatial dimensions. We present an improved method to accurately estimate both components of the velocity vector, relying on three non-aligned measurement points. We introduce a stochastic process describing the fluctuations as a superposition of uncorrelated pulses moving in two dimensions. Using this model, we show that the three-point velocity estimation method, using time delays calculated through cross correlations, yields the exact velocity components when all pulses have the same velocity. The two- and three-point methods are tested on synthetic data generated from realizations of such processes for which the underlying velocity components are known. The results reveal the superiority of the three-point technique. Finally, we demonstrate the applicability of the velocity estimation on gas puff imaging data of strongly intermittent plasma fluctuations due to the radial motion of coherent, blob-like structures at the boundary of the Alcator C-Mod tokamak.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"13 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The integration of electric vehicles (EVs) is becoming vital for both the transportation and energy sectors. At the same time, they need an appropriate charging facility. Photovoltaic (PV) powered electric vehicle chargers are gaining popularity since they require negligible maintenance and steadily enhance the efficiency of PV modules. In this paper, a grid tied solar PV with a 12 pulse Line Commutated Converter (LCC) based off board EV charger is presented. The specialty of the proposed method is that it does not require an extra controller for ac grid synchronization. In addition, simplified maximum power point tracking (MPPT) control is proposed, which will track the MPP of the PV array. The main disadvantage of LCC is its poor harmonics profile, which can be improved by a higher pulse number with adequate phase shift. With 12 pulse LCC, high characteristics harmonics are greatly reduced. The performance and efficacy of the suggested method have been confirmed by simulation, which proves the feasibility of the proposed solution for EV charging in both grid-to-vehicle (G2V) and vehicle-to-grid (V2G) modes.
{"title":"A grid tied solar photovoltaic based off board electric vehicle charger in G2V and V2G mode","authors":"Jyoti M. Kumbhare, Sumant G. Kadwane","doi":"10.1063/5.0212427","DOIUrl":"https://doi.org/10.1063/5.0212427","url":null,"abstract":"The integration of electric vehicles (EVs) is becoming vital for both the transportation and energy sectors. At the same time, they need an appropriate charging facility. Photovoltaic (PV) powered electric vehicle chargers are gaining popularity since they require negligible maintenance and steadily enhance the efficiency of PV modules. In this paper, a grid tied solar PV with a 12 pulse Line Commutated Converter (LCC) based off board EV charger is presented. The specialty of the proposed method is that it does not require an extra controller for ac grid synchronization. In addition, simplified maximum power point tracking (MPPT) control is proposed, which will track the MPP of the PV array. The main disadvantage of LCC is its poor harmonics profile, which can be improved by a higher pulse number with adequate phase shift. With 12 pulse LCC, high characteristics harmonics are greatly reduced. The performance and efficacy of the suggested method have been confirmed by simulation, which proves the feasibility of the proposed solution for EV charging in both grid-to-vehicle (G2V) and vehicle-to-grid (V2G) modes.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"6 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chao-Ching Chiang, Jian-Sian Li, Hsiao-Hsuan Wan, Fan Ren, Stephen J. Pearton
The use of the low work function (4.5 eV) tungsten (W) as a rectifying contact was studied to obtain low on-voltages in W/Ga2O3 Schottky rectifiers and NiO/Ga2O3 heterojunction rectifiers that were simultaneously fabricated on a single wafer. The devices were produced with varying proportions of relative areas and diameters, encompassing a spectrum from pure Schottky Barrier Diode (SBD) to pure Heterojunction Diode (HJD) configurations. The turn-on voltages with W contacts ranged from 0.22 V for pure Schottky rectifiers to 1.50 V for pure HJDs, compared to 0.66 and 1.77 V, respectively, for Ni/Au contacts. The reverse recovery times ranged from 31.2 to 33.5 ns for pure Schottky and heterojunction rectifiers. Switching energy losses for the SBD with W contacts were ∼20% of those for HJDs. The reverse breakdown voltages ranged from 600 V for SBDs to 2400 V for HJDs. These are the lowest reported turn-on voltage values for 600/1200 V-class Ga2O3 rectifiers that extend the range of applications of these devices down to the voltages of interest for electric vehicle charging applications.
研究人员利用低功函数（4.5 eV）钨（W）作为整流触点，在 W/Ga2O3 肖特基整流器和 NiO/Ga2O3 异质结整流器中获得低导通电压。这些器件的相对面积和直径比例各不相同，涵盖了从纯肖特基势垒二极管（SBD）到纯异质结二极管（HJD）的各种配置。纯肖特基整流器 W 触点的开启电压为 0.22 V，纯 HJD 为 1.50 V，而镍/金触点的开启电压分别为 0.66 V 和 1.77 V。纯肖特基和异质结整流器的反向恢复时间为 31.2 至 33.5 ns。带 W 触点的 SBD 的开关能量损失是 HJD 的 20%。SBD 的反向击穿电压从 600 V 到 HJD 的 2400 V 不等。这是报告的 600/1200 V 级 Ga2O3 整流器的最低导通电压值，将这些器件的应用范围扩展到了电动汽车充电应用所需的电压。
{"title":"Achievement of low turn-on voltage in Ga2O3 Schottky and heterojunction hybrid rectifiers using W/Au anode contact","authors":"Chao-Ching Chiang, Jian-Sian Li, Hsiao-Hsuan Wan, Fan Ren, Stephen J. Pearton","doi":"10.1063/5.0227210","DOIUrl":"https://doi.org/10.1063/5.0227210","url":null,"abstract":"The use of the low work function (4.5 eV) tungsten (W) as a rectifying contact was studied to obtain low on-voltages in W/Ga2O3 Schottky rectifiers and NiO/Ga2O3 heterojunction rectifiers that were simultaneously fabricated on a single wafer. The devices were produced with varying proportions of relative areas and diameters, encompassing a spectrum from pure Schottky Barrier Diode (SBD) to pure Heterojunction Diode (HJD) configurations. The turn-on voltages with W contacts ranged from 0.22 V for pure Schottky rectifiers to 1.50 V for pure HJDs, compared to 0.66 and 1.77 V, respectively, for Ni/Au contacts. The reverse recovery times ranged from 31.2 to 33.5 ns for pure Schottky and heterojunction rectifiers. Switching energy losses for the SBD with W contacts were ∼20% of those for HJDs. The reverse breakdown voltages ranged from 600 V for SBDs to 2400 V for HJDs. These are the lowest reported turn-on voltage values for 600/1200 V-class Ga2O3 rectifiers that extend the range of applications of these devices down to the voltages of interest for electric vehicle charging applications.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"9 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, the higher order electrostatic and solitonic EA energy plasma in auroral plasma has been investigated. The perturbed KdV form has been solved. The modulated soliton speed, energy of the cold beam electrons, and the associated higher fifth order electrostatic field have been mathematically derived. The effect of perturbed beam density as well as beam temperature parameters on the dressed electrostatic and energy properties has been discussed. The auroral plasma results in this work may be important in space applications.
本研究对极光等离子体中的高阶静电和孤子 EA 能量等离子体进行了研究。对扰动 KdV 形式进行了求解。调制孤子的速度、冷束电子的能量以及相关的高五阶静电场都已用数学方法推导出来。还讨论了扰动束密度和束流温度参数对敷装静电和能量特性的影响。这项工作中的极光等离子体结果可能在空间应用中具有重要意义。
{"title":"On the modulated fifth order dressed electron acoustic electrostatic and energy features in auroral plasma","authors":"K. S. Alsadi, E. M. Darwish, E. K. El-Shewy","doi":"10.1063/5.0227184","DOIUrl":"https://doi.org/10.1063/5.0227184","url":null,"abstract":"In this work, the higher order electrostatic and solitonic EA energy plasma in auroral plasma has been investigated. The perturbed KdV form has been solved. The modulated soliton speed, energy of the cold beam electrons, and the associated higher fifth order electrostatic field have been mathematically derived. The effect of perturbed beam density as well as beam temperature parameters on the dressed electrostatic and energy properties has been discussed. The auroral plasma results in this work may be important in space applications.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"22 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：