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Machine learning-driven optimization of plasma-catalytic dry reforming of methane

Journal of Energy Chemistry 2024年第9期96卷 153-163页

作者： Yuxiang Cai Danhua Mei Yanzhen Chen Annemie bogaerts Xin Tu Department of Electrical Engineering and Electronics University of LiverpoolLiverpool L693GJUK Research Group PLASMANT Department of ChemistryUniversity of AntwerpUniversiteitsplein 1BE-2610 Wilrijk-AntwerpBelgium College of Electrical Engineering and Control Science Nanjing Tech UniversityNanjing 211816JiangsuChina

This study investigates the dry reformation of methane(DRM)over Ni/Al_(2)O_(3)catalysts in a dielectric barrier discharge(DBD)non-thermal plasma reactor.A novel hybrid machine learning(ML)model is developed to optimize the plasma-catalytic DRM reaction with limited experimental *** address the non-linear and complex nature of the plasma-catalytic DRM process,the hybrid ML model integrates three well-established algorithms:regression trees,support vector regression,and artificial neural networks.A genetic algorithm(GA)is then used to optimize the hyperparameters of each algorithm within the hybrid ML *** ML model achieved excellent agreement with the experimental data,demonstrating its efficacy in accurately predicting and optimizing the DRM *** model was subsequently used to investigate the impact of various operating parameters on the plasma-catalytic DRM *** found that the optimal discharge power(20 W),CO_(2)/CH_(4)molar ratio(1.5),and Ni loading(7.8 wt%)resulted in the maximum energy yield at a total flow rate of∼51 mL/***,we investigated the relative significance of each operating parameter on the performance of the plasma-catalytic DRM *** results show that the total flow rate had the greatest influence on the conversion,with a significance exceeding 35%for each output,while the Ni loading had the least impact on the overall reaction *** hybrid model demonstrates a remarkable ability to extract valuable insights from limited datasets,enabling the development and optimization of more efficient and selective plasma-catalytic chemical processes.

关键词： Plasma catalysis Machine learning Process optimization Dry reforming of methane Syngas production

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爱尔兰的植物篱和竹林场之间的植物物种丰富度比较

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世界竹藤通讯 2012年第5期10卷 46-46页

作者： litsa bogaerts Iulia Klimina Steven Dauwe Jan Ostermeyer Pieter Ostermeyer Davina VanGoethem Kris Verheyen Geert Potters 根特大学生物工程学院Coupurelinks653比利时根特B-9000 安特卫普大学生物工程系Groenenborgerlaan171比利时安特卫普B-2020 安特卫普海事学院 Noordkasteel Oost6比利时安特卫普B-2030

本研究的目的是探讨由几个外来竹种（***＇Alata’）组成的竹生物人工林是否对其周围固有的本地植物群系造成负面的影响。这项研究在爱尔兰都柏林的一个六年生的人工竹林中进行。这片竹林和与之特性相同的41个植物篱都经过了检查并得到... 详细信息

本研究的目的是探讨由几个外来竹种（***＇Alata’）组成的竹生物人工林是否对其周围固有的本地植物群系造成负面的影响。这项研究在爱尔兰都柏林的一个六年生的人工竹林中进行。这片竹林和与之特性相同的41个植物篱都经过了检查并得到了其完整物种清单。在42个取样区域共发现有101种物种。利用双向指示种分析法将这些样地分为11组，竹林和植物篱之间没有呈现出明显的区别。在记录树篱（hedges）数据的基础上，绘制了一个物种一面积关系，其关系为公式S=2．366A0．38。通过这个公式计算，竹场周围面积内所包含的物种应该只有37种而不是所发现的39种。多索伦森指数（MultipleS6rensenindices）被用来做每个树篱和竹场之间的两两相交，结果显示平均为0．41±0．10。鉴于结果显示竹场包括比预期更多的物种，并且双向指示种分析法不能明确区分竹和其邻近的之植物篱的基地环境，本研究得出以下结论，在农业环境中外来竹类资源的出现对本地植物区系的生态多样性没有不利的影响。

关键词：竹子植物篱物种丰富度双向指示种分析

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刚竹属和箭竹属的内生细菌群落的可视化与鉴定

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世界竹藤通讯 2012年第4期10卷 45-45页

作者： Olena V..Moshynets Judicaelle Brunet Svetlana P.Shpylova litsa bogaerts Vitalii A. Kordium GeertPotters 乌克兰国家科学院分子生物学和遗传学研究所巴黎大学安特卫普大学生物科学工程系安特卫普海事学院

过去10年中，研究均显示内生真菌在植物生理中发挥重要的作用，甚至对农业和植物的自身修复中提供有益的帮助。对于多功能植物种类如竹类资源的内栖植物（endoflora）的认识可以加强这些已被用在农业和植物自身修复方面的植物被广泛应... 详细信息

过去10年中，研究均显示内生真菌在植物生理中发挥重要的作用，甚至对农业和植物的自身修复中提供有益的帮助。对于多功能植物种类如竹类资源的内栖植物（endoflora）的认识可以加强这些已被用在农业和植物自身修复方面的植物被广泛应用的可能性。然而，与可能带来的好处相比，目前对它的呈现形式几乎一无所知，更不要说竹种资源内生细菌的活动机制了。我们在工作中汇集了几个的竹种（确切的说是刚竹属的几个竹种）的内生细菌群落。利用无干扰的棕竹（***）和青川箭竹（Fargesiarufa）作为其内部细菌典型菌种分离策略的基准，从而获得纯培养的内生细菌。对所获得的菌株的鉴定表明，这2个物种都含芽孢杆菌。在地下的内生菌培养期间，棕竹（***）的地上内生菌要更加多种多样，包括不同的属，如：微杆菌属、LeifsoniaSP、类芽孢杆菌、土壤杆菌属／根瘤菌属、假单胞菌属，伯克氏菌属。此外，乌芽竹（***，）、紫竹（***）棕竹（***）的植株和细菌的整个DNA提取直接包含在相关的细菌序列鉴定中。本研究揭示了微杆菌属在乌芽竹（***，）、紫竹（***）棕竹（***）以及未经培养的菌种中的存在。最后，我们采用了经典的Cholodny（1934）土壤真菌计数法进行了修正。Cholodny利用玻璃显微镜的载玻片来获得土壤细菌群落的样式，形成一个微观精细的景观生态，后来他利用不同的显微镜技术对这种方法进行了研究。在我们的修正中，利用聚对苯二甲酸乙二醇酯制成的塑料薄膜作为细菌群落附属和直接生长的基体，以保持这些菌落的原有的（原位）空间形态和结构。就其本身而言，这种方法是为了更好的对内生菌的细胞生态学的了解，即植物细胞及其内生菌之间的本质的关联。

关键词：内生菌竹子 16s核糖体DNA

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Effects of coupling and phase imperfections in programmable photonic hexagonal waveguide meshes

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Photonics Research 2020年第2期8卷 211-218页

作者： IMAN ZAND WIM bogaerts Photonics Research Group Department of Information TechnologyGhent University-IMEC9052 GhentBelgium Center of Nano and Biophotonics Ghent University9052 GhentBelgium

We present a study of the effect of imperfections on the transmission and crosstalk in programmable photonic meshes with feedback loops consisting of tunable couplers and phase *** many elements in such a mesh can generate a multitude of parasitic paths when the couplers and phase shifters deviate even slightly from their nominal *** Monte Carlo simulations,we show that small stochastic imperfections in the phase and coupling(<1.0%)can introduce unwanted interferences and resonances and significantly deteriorate the frequency response of the *** also demonstrate that,in the presence of imperfections,the programming strategy of the unused couplers can reduce effects of such parasitics.

关键词： waveguide coupling phase

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Optical leaky fin waveguide for long-range optical antennas on high-index contrast photonic circuit platforms

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Photonics Research 2023年第9期11卷 1570-1582页

作者： LUKAS VAN ISEGHEM WIM bogaerts Photonics Research Group Department of Information TechnologyGhent University-IMECGhentBelgium Center for Nano-and Biophotonics(NB Photonics) Ghent UniversityGhentBelgium

Long-distance light detection and ranging(LiDAR)applications require an aperture size in the order of 30 mm to project 200–300 *** generate such collimated Gaussian beams from the surface of a chip,this work presents a novel waveguide antenna concept,which we call an“optical leaky fin antenna,”consisting of a tapered waveguide with a narrow vertical“fin”on *** proposed structure(operating aroundλ=1.55μm)overcomes fundamental fabrication challenges encountered in weak apodized gratings,the conventional method to create an offchip wide Gaussian beam from a waveguide *** explore the design space of the antenna by scanning the relevant cross section parameters in a mode solver,and their sensitivity is *** also investigate the dispersion of the emission pattern and angle with the *** simulated design space is then used to construct and simulate an optical antenna to emit a collimated target intensity *** show inherent robustness to crucial design parameters and indicate good scalability of the *** and challenges to fabricate this device concept are also *** novel antenna concept illustrates the possibility to integrate long optical antennas required for long-range solid-state LiDAR systems on a high-index contrast platform with a scalable fabrication method.

关键词： waveguide antenna optical

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Backcoupling manipulation in silicon ring resonators

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Photonics Research 2018年第6期6卷 620-629页

作者： ANG LI WIM bogaerts Photonics Research Group Ghent University-IMECDepartment of Information TechnologyGhent University Center for Nano- and Biophotonics Ghent University

In this paper, we theoretically propose and experimentally demonstrate the manipulation of a novel degree of freedom in ring resonators, which is the coupling from the clockwise input to the counterclockwise propagating mode （and vice versa）. We name this mechanism backcoupling, in contrast with the normal forward-coupling of a directional coupler. It is well known that internal reflections will cause previous research demonstrated that the peak asymmetry will be strongly influenced by the backcoupling. Thus, it is worth manipulating the backcoupling in order to gain full control of a split resonance for the benefit of various resonance-splitting-based applications. While it is difficult to directly manipulate the backcoupling of a conventional directional coupler, here we design a circuit explicidy for manipulating the backcoupling. It can be potentially developed for applications such as single sideband filter, resonance splitting elimination, Fano resonance, and ultrahigh-Q and finesse.

关键词： Integrated optics devices Resonators Wavelength filtering devices Traveling-wave devices Electromagnetic optics

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Is a catalyst always beneficial in plasma catalysis? Insights from the many physical and chemical interactions

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Journal of Energy Chemistry 2023年第10期85卷 501-533,I0013页

作者： Björn Loenders Roel Michiels Annemie bogaerts Research group PLASMANT Department of ChemistryUniversity of AntwerpUniversiteitsplein 1B-2610 Wilrijk-AntwerpBelgium

Plasma-catalytic dry reforming of CH_(4)(DRM) is promising to convert the greenhouse gasses CH_(4) and CO_(2) into value-added chemicals, thus simultaneously providing an alternative to fossil resources as feedstock for the chemical industry. However, while many experiments have been dedicated to plasma-catalytic DRM, there is no consensus yet in literature on the optimal choice of catalyst for targeted products,because the underlying mechanisms are far from understood. Indeed, plasma catalysis is very complex,as it encompasses various chemical and physical interactions between plasma and catalyst, which depend on many parameters. This complexity hampers the comparison of experimental results from different studies, which, in our opinion, is an important bottleneck in the further development of this promising research field. Hence, in this perspective paper, we describe the important physical and chemical effects that should be accounted for when designing plasma-catalytic experiments in general, high-lighting the need for standardized experimental setups, as well as careful documentation of packing properties and reaction conditions, to further advance this research field. On the other hand, many parameters also create many windows of opportunity for further optimizing plasma-catalytic ***, various experiments also reveal the lack of improvement in plasma catalysis compared to plasma-only, specifically for DRM, but the underlying mechanisms are unclear. Therefore, we present our newly developed coupled plasma-surface kinetics model for DRM, to provide more insight in the underlying reasons. Our model illustrates that transition metal catalysts can adversely affect plasmacatalytic DRM, if radicals dominate the plasma-catalyst interactions. Thus, we demonstrate that a good understanding of the plasma-catalyst interactions is crucial to avoiding conditions at which these interactions negatively affect the results, and we provide some recommendations for im

关键词： Plasma catalysis Dry reforming of methane Discharges Reaction kinetics Modelling

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Design of a single all-silicon ring resonator with a 150 nm free spectral range and a 100 nm tuning range around 1550 nm

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Photonics Research 2016年第2期4卷 84-92页

作者： Ang Li Qiangsheng Huang Wim bogaerts Photonics Research Group Department of Information Technology Ghent University-IMEC Center for Nano- and Biophotonics (NB-photonics) Ghent University State Key Laboratory for Modern Optical Instrumentation Centre for Optical and Electromagnetic ResearchZhejiang Provincial Key Laboratory for Sensing Technologies Zhejiang University Luceda Photonics

We present a novel and simple method to obtain an ultrawide free spectral range(FSR) silicon ring resonator together with a tuning range covering the entire spectrum from 1500 to 1600 nm. A ring resonator with a large FSR together with a high Q factor, high tuning efficiency, and low fabrication cost and complexity is desired for many applications. In this paper, we introduce a novel way to make such a ring resonator, which takes advantage of the well-known resonance-splitting phenomenon. It is a single ring resonator with an FSR of more than 150 nm around 1550 nm and which has an easy thermo-optic tunability that can produce a tuning range around 90 nm or even more. Moreover, the device is simple to implement and can be fabricated in standard complementary metal-oxide semiconductor technology without requiring any kind of complicated processing or extra *** potential applications include single mode laser cavities, wavelength division multiplexing filters,(de)multiplexers, optical sensors, and integrated reflectors.

关键词： ring mode free

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Plasma-based CO_(2) conversion:How to correctly analyze the performance?

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Journal of Energy Chemistry 2023年第11期86卷 180-196,I0005页

作者： Bart Wanten Rani Vertongen Robin De Meyer Annemie bogaerts Research Group PLASMANT Department of ChemistryUniversity of AntwerpUniversiteitsplein 12610 AntwerpBelgium Research group EMAT Department of PhysicsUniversity of AntwerpGroenenborgerlaan 1712020 AntwerpBelgium

Plasma-based CO_(2)conversion is promising for carbon capture and ***,inconsistent reporting of the performance metrics makes it difficult to compare plasma processes systematically,complicates elucidating the underlying mechanisms and compromises further development of this ***,this critical review summarizes the correct definitions for gas conversion in plasma reactors and highlights common errors and inconsistencies observed throughout *** is done for pure CO_(2)splitting,dry reforming of methane and CO_(2)*** demonstrate that the change in volumetric flow rate is a critical aspect,inherent to these reactions,that is often not correctly taken into *** dry reforming of methane and CO_(2)hydrogenation,we also demonstrate inconsistent reporting of energy efficiency,and through numerical examples,we show the significance of these ***,we discuss how to measure changes in volumetric flow rate,supported by data from two experimental examples,showing that the sensitivity inherent to a standard component and a flow meter is essential to consider when deriving the performance ***,some general recommendations and good practices are *** paper aims to be a comprehensive guideline for authors,to encourage more consistent calculations and stimulate the further development of this technology.

关键词： Plasma CO_(2) Dry reforming of methane CO_(2) hydrogenation Conversion Performance

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Time-domain compact macromodeling of linear photonic circuits via complex vector fitting

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Photonics Research 2019年第7期7卷 86-97页

作者： Yinghao Ye Domenico Spina Dirk Deschrijver Wim bogaerts Tom Dhaene IDLab Department of Information TechnologyGhent University-imecGhentBelgium Photonics Research Group Department of Information TechnologyGhent University-imecGhentBelgium The Center for Nano-and Biophotonics(NB-Photonics) GhentBelgium

In this paper, a novel baseband macromodeling framework for linear passive photonic circuits is proposed, which is able to build accurate and compact models while taking into account the nonidealities,such as higher order dispersion and wavelength-dependent losses of the circuits. Compared to a previous modeling method based on the vector fitting algorithm, the proposed modeling approach introduces a novel complex vector fitting technique. It can generate a half-size state-space model for the same applications, thereby achieving a major improvement in efficiency of the time-domain simulations. The proposed modeling framework requires only measured or simulated scattering parameters as input,which are widely used to represent linear and passive systems. Three photonic circuits are studied to demonstrate the accuracy and efficiency of the proposed technique.

关键词： Time-domain compact circuits parameters

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