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Performance of evolutionary optimized machine learning for modeling total organic carbon in core samples of shale gas fields

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Petroleum 2024年第1期10卷 150-164页

作者： Leonardo Goliatt c.M.Saporetti L.c.Oliveira E.Pereira Department of computational and Applied Mechanics Federal University of Juiz de Fora Department of computational Modeling Polytechnic Institute Rio de Janeiro State University Petrobras Department of Stratigraphy and Paleontology Rio de Janeiro State University

Rock samples' TOc content is the best indicator of the organic matter in source rocks. The origin rock samples' analysis is used to calculate it manually by specialists. This method requires time and resources because it relies on samples from many well intervals in source rocks. Therefore, research has been done to aid this effort. Machine learning algorithms can estimate total organic carbon instead of well logs and stratigraphic studies. In light of these efforts, the current work present a study on automating the total organic carbon estimation using machine learning approaches improved by an evolutionary methodology to give the model flexibility and precision. Genetic algorithms, differential evolution, particle swarm optimization, grey wolf optimization, artificial bee colony, and evolution strategies were used to improve machine learning models to predict TOc. The six metaheuristics were integrated into four machine learning methods: extreme learning machine, elastic net linear model, linear support vector regression, and multivariate adaptive regression splines. core samples from the YuDong-Nan shale gas field, located in the Sichuan basin, were used to evaluate the hybrid strategy. The findings show that combining machine learning models with an evolutionary algorithms in a hybrid fashion produce flexible models that accurately predict TOc. The results show that, independent of the metaheuristic used to guide the model selection, optimized extreme learning machines attained the best performance scores according to six metrics. Such hybrid models can be used in exploratory geological research,particularly for unconventional oil and gas resources.

关键词： Total organic carbon hybrid models Automated machine learning Evolutionary algorithms Geology

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Rational design of AgGaS/ZnS/ZnS quantum dots with a near-unity photoluminescence quantum yield via double shelling scheme

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Journal of Materials Science & Technology 2024年第2期169卷 235-242页

作者： h.X.Lu h.Liu Z.Z.Fu Y.Y.chen h.Q.Dai Z.hu W.L.Zhang R.Q.Guo Institute for Electric Light Sources School of Information Science and TechnologyFudan UniversityShanghai 200433China Institute of Future Lighting Academy for Engineering and TechnologyFudan UniversityShanghai 200433China Yiwu Research Institute of Fudan University YiwuZhejiang 322000China Zhongshan-Fudan Joint Innovation center Zhongshan 528437China

In this study,a two-step method was used to synthesize highly luminescent AgGaS/ZnS/ZnS quantum dots(QDs).In the first step,an inner ZnS shell was formed via a one-pot method,which resulted in a smaller lattice mismatch between the AgGaS core and the outer ZnS shell,thereby facilitating the formation of a thick outer *** the two-step shelling process,the synthesized AgGaS/ZnS/ZnS QDs showed an excellent photoluminescence quantum yield(PLQY)of 96.4%with a peak wavelength of 508 nm,repre-senting the highest PLQY reported thus far for AgGaS ***,the effect of halogen ions in Zn precursors on the shelling process was *** was proposed that the capacity of halogen ions to coordinate with the QDs influenced the balance between Zn cation diffusion and ZnS shelling ***,the ZnS shelling reaction was dominant when Zncl_(2)was employed,while Zn cation diffusion was the dominant process under the I^(−)-rich *** work provides insights into the interfacial restructuring during the ZnS shelling and offers a clear map for the tailored synthesis of core/shell QDs.

关键词： AgGaS Quantum dots Photoluminescence core/shell Alloyed core/shell interface

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An Adaptive Data-driven Method Based on Fuzzy Logic for Determining Power System Voltage Status

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Journal of Modern Power Systems and clean Energy 2024年第3期12卷 707-718页

作者： Sirwan Shazdeh hêmin Golpîra hassan Bevrani the SMGRc University of KurdistanSanandajIran Power Systems Modeling&Simulation Lab Department of Electrical EngineeringUniversity of KurdistanKurdistanSanandaj 66177-15175Iran

This paper proposes an adaptive method based on fuzzy logic that utilizes data from phasor measurement units(PMUs) to assess and classify generating-side voltage trajectories. The voltage variable and its associated derivatives are used as the input variables of a fuzzy-logic block. In addition, the voltage trajectory is compared with the pre-selected pilot-bus voltage to make a reliable decision about the voltage operational state. Different types of short-term voltage dynamics are considered in the proposed method. The fuzzy membership functions are determined using a systematic method that considers the current situation of the voltage trajectory. Finally, the voltage status is categorized into four classes to determine appropriate remedial actions. The proposed method is validated on a IEEE 73-bus power system in a MATLAB environment.

关键词： Fuzzy logic fault-induced delayed voltage recovery phasor measurement unit(PMU) short-term voltage stability situational awareness voltage classification

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基于任务型教学法在越南初级汉语口语线上教学中的行动研究

基于任务型教学法在越南初级汉语口语线上教学中的行动研究

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作者： hOANG ThI chung（黄氏钟）华东师范大学

学位级别：硕士

任务型教学法是20世纪80年代以来在对外汉语教学中逐渐形成和应用的一种新的教学方法。此后这种教学方法逐渐发展并在对外汉语教学领域得到广泛应用。由于该教学方法具有许多优点,最突出的优点是促进学生学习的创造力和主动性,提高学生... 详细信息

任务型教学法是20世纪80年代以来在对外汉语教学中逐渐形成和应用的一种新的教学方法。此后这种教学方法逐渐发展并在对外汉语教学领域得到广泛应用。由于该教学方法具有许多优点,最突出的优点是促进学生学习的创造力和主动性,提高学生的语言能力。因此,近年来世界上有很多语言学家对该教学方法从不同角度进行研究。对越南的汉语教学界来说,任务型教学法因为诸多客观条件的限制,并未在汉语教育领域中得到广泛应用,尤其是线上教学形式。本论文在前人语言专家成果的理论基础上,继续对基于任务型教学法应用在越南初级汉语口语线上课堂进行深入研究。本论文分为6章:其中第一章、第二章主要论述基于任务型教学法的理论基础,设计原则以及相关文献综述。第三章的内容是从第二章的理论基础进行教学设计,本论文的研究对象是信锦越南厂责任有限公司的越南人员,使用的教材是速通汉语教程。第四章根据第三章的教学设计进行两轮实施教学,收集学生的反馈。第五章根据教师和学生对初级汉语口语线上课堂设计任务的反馈,进行对任务型初级汉语口语教学的反思。最后,第六章针对任务型教学法在越南汉语初级口语线上课堂的设计任务和编写任务型教学法的口语教材提出建议。本研究的研究方法是行动研究,通过两轮行动研究,实施教学,提出问题,从自己实施教学中的观察和经验提出建议。本研究的教学设计结果包括:速通汉语教程第一册第八课《你的生日是几月几号?》,第十课《你家有几口人?》;第二册第一课《你在听什么?》,第二课《你平时几点起床?》基于任务型教学法设计的教案。通过这篇论文,基于任务型教学法在越南初级汉语口语线上课堂教案设计和两轮实施教学创建一个在信锦越南厂责任有限公司应用的汉语教学模式,任务的设计会考虑到学习者的学习特点。希望未来能够推广在越南河南工业区所有的中国台湾公司应用。

关键词：任务型教学法初级汉语口语越南学生线上教学

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The Role of the Size Effect on the Drying of Refractory castables—how Its Under-standing could Narrow the Gap between Laboratory Studies and Industrial Reality

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china's Refractories 2024年第2期33卷 35-40页

作者： M.h.MOREIRA h.PENG S.Dal PONT V.c.PANDOLFELLI Materials Engineering Department Federal University of São Carlos(UFSCar)São Carlos 13565-905Brazil Materials Innovation Elkem Silicon Products DevelopmentKristiansand 4621Norway cNRS Grenoble INP3SRUniversitéGrenoble AlpesGrenoble 38000France

Refractories have unique capabilities such as sustaining their shape and properties at extreme conditions such as the combination of high temperatures and thermal shock,contact with molten metals and slags and in some circumstances resistance to erosion from abrasive *** the large processing output of the heavy industries such as the cement and steel ones which both require high temperature processes,the refractories structures span various meters and weight of several *** the water removal stage of hydraulic bonded castables in industrial sites takes hours(10-60 h)due to the risk of explosive spalling,efforts to mitigate it are commonly *** has provided theoretical understanding of the general aspects of drying and important tools,such as the thermogravimetry analysis(TGA),for the design of refractory compositions with higher explosive spalling ***,the optimization of this process is still far from the industrial reality especially because the actual linings that require the drying are orders of magnitude larger than the samples considered in the laboratory ***,this study proposed the analysis of the sample volume effect on the water removal dynamics through TGA of high alumina castables with calcium aluminate ***φ5 cm×5 cm cylindrical samples were assessed in a laboratory scale equipment whereas macro TGA were carried out considering 20 cm×20 cm×20 cm and 30 cm×30 cm×30 cm cubic ***,the effect of polymeric fibers was also *** was found out that the different thermal gradients within the macro TGA samples resulted in an inflection on the sample’s heating rate and that the mass loss was affected by the volume considered,especially for the composition without *** findings highlight the requirement of carefully taking into consideration the different dimensional sizes and thermal gradients in the samples when analyzing and interpreting the laboratory studies,and

关键词： drying refractory castables size effect thermogravimetry analysis

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