检索结果-南通市图书馆

Effect of preprocessing on performances of machine learning-based mineral composition analysis on gas hydrate sediments, Ulleung Basin, East Sea

引用

Petroleum Science 2025年第1期22卷 151-162页

作者： Hongkeun Jin Ju Young Park Sun Young Park Byeong-Kook Son Baehyun Min Kyungbook Lee Department of Geoenvironmental Sciences Kongju National University Tunnel & Underground Facility division ESCO Consultant & Engineers Company Yellow Sea Institute of Geoenvironmental Sciences Petroleum and Marine research division Korea Institute of Geoscience and Mineral Resources Department of Climate and Energy systems Engineering Ewha Womans University Center for Climate/Environment Change Prediction research Ewha Womans University

Gas hydrate(GH) is an unconventional resource estimated at 1000-120,000 trillion *** on GH is ongoing to determine its geological and flow characteristics for commercial production. After two large-scale drilling expeditions to study the GH-bearing zone in the Ulleung Basin, the mineral composition of 488 sediment samples was analyzed using X-ray diffraction(XRD). Because the analysis is costly and dependent on experts, a machine learning model was developed to predict the mineral composition using XRD intensity profiles as input data. However, the model's performance was limited because of improper preprocessing of the intensity profile. Because preprocessing was applied to each feature, the intensity trend was not preserved even though this factor is the most important when analyzing mineral composition. In this study, the profile was preprocessed for each sample using minmax scaling because relative intensity is critical for mineral analysis. For 49 test data among the 488data, the convolutional neural network(CNN) model improved the average absolute error and coefficient of determination by 41% and 46%, respectively, than those of CNN model with feature-based preprocessing. This study confirms that combining preprocessing for each sample with CNN is the most efficient approach for analyzing XRD data. The developed model can be used for the compositional analysis of sediment samples from the Ulleung Basin and the Korea Plateau. In addition, the overall procedure can be applied to any XRD data of sediments worldwide.

关键词： Sample-based preprocessing X-ray diffraction (XRD) Machine learning Mineral composition Gas hydrate (GH) Ulleung basin

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Palaeodrainages of the Sunda Shelf detailed in new maps

引用

Journal of Palaeogeography 2025年第1期14卷 186-202页

作者： Shawn Cheng Mohd Azahari Faidi Forestry Biotechnology division Forest Research Institute Malaysia (FRIM) Forestry and Environment division FRIM

The Sunda Shelf is a prime biodiversity hotspot where some of the planet's most endemic species can be found. Much of the diversity in this important bioregion has been shaped by sea-level fluctuations that took place during the Pleistocene. Using depth contours obtained from the General Bathymetric Chart of the Oceans Grid 2023, we provide high-resolution reconstruction of land areas and palaeo-drainages on the Sunda Shelf at the 50, 75, 100, and 120 m isobaths, as well as palaeo-catchments at the 120 m isobath, in order to elucidate the history of this region. The maps presented here aim to reconstruct the connection between palaeo-rivers in the Sunda Shelf and contemporary rivers and identify possible dispersal routes and barriers for the floras and faunas/biotas associated with riverine systems found here.

关键词： Sea-levels River(s) Pleistocene Sunda Shelf Southeast Asia Palaeogeography

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Recent advancements of nonlinear dynamics in mode coupled microresonators: a review

引用

Applied Mathematics and Mechanics(English Edition) 2025年第2期46卷 209-232页

作者： Xuefeng WANG Zhan SHI Qiqi YANG Yuzhi CHEN Xueyong WEI Ronghua HUAN Department of Engineering Mechanics MIIT Key Laboratory of Dynamics and Control of Complex Systems Northwestern Polytechnical University Department of Mechanics Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University State Key Laboratory for manufacturing systems Engineering Xi'an Jiaotong University

Due to scale effects, micromechanical resonators offer an excellent platform for investigating the intrinsic mechanisms of nonlinear dynamical phenomena and their potential applications. This review focuses on mode-coupled micromechanical resonators,highlighting the latest advancements in four key areas: internal resonance, synchronization, frequency combs, and mode localization. The origin, development, and potential applications of each of these dynamic phenomena within mode-coupled micromechanical systems are investigated, with the goal of inspiring new ideas and directions for researchers in this field.

关键词： mode coupling micro-electro-mechanical system (MEMS) resonator nonlinear dynamics O32

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Novel transparent high-entropy sesquioxide ceramics with high physicochemical plasma etching resistance

引用

Journal of Advanced Ceramics 2025年第1期14卷 163-176页

作者： Yu-Bin Shin Su Been Ham Ha-Neul Kim Mi-Ju Kim Jae-Woong Ko Jae-Wook Lee Young-Jo Park Jung-Hyung Kim Hyo-Chang Lee Young Hwa Jung Jung Woo Lee Ho Jin Ma nano Materials research division Korea Institute of Materials ScienceChangwon 51508Republic of Korea Department of Materials Science and Engineering Pusan National UniversityPusan 46241Republic of Korea Semiconductor Integrated Metrology Team Korea Research Institute of Standards and ScienceDaejeon 34113Republic of Korea Department of semiconductor Science Engineering and TechnologyKorea Aerospace UniversityGoyang 10540Republic of Korea School of Electronics and Information Engineering Korea Aerospace UniversityGoyang 10540Republic of Korea PLS-II Beamline division Pohang Accelerator LaboratoryPohang 37673Republic of Korea

High-entropy ceramics exhibit novel intrinsic ***,they have been explored for a wide range of applications ranging from thermal insulation and energy storage to advanced optical ***,the semiconductor industry has faced a demand for higher-performance chips,necessitating higher aspect ratios in wafer fabrication and further miniaturization of ***,novel materials with high plasma etching resistance and minimal contaminant generation are *** plasma-etching resistance displayed by high-entropy ceramics can be an innovative solution to this emerging *** this study,we successfully fabricated single-phase high-entropy sesquioxide ceramics with high optical transparency,dense microstructure,and minimal residual pores.A structural analysis of the fabricated samples revealed a single-phase structure with excellent phase *** evaluation of the plasma-etching resistance of high-entropy ceramics revealed for the first time a low etching rate of 8 nm/h compared with that of conventional plasma-resistant *** comprehensive characterizations of high-entropy ceramics indicate that they are promising candidates for significantly improving the production yield of semiconductors and for a wide range of potential applications,such as next-generation active optical ceramics.

关键词： high-entropy ceramics plasma etching resistance transparent ceramics sintering semiconductor manufacturing

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Finger tracking for wearable VR glove using flexible rack mechanism

引用

虚拟现实与智能硬件(中英文) 2025年第01期7卷 1-25页

作者： Roshan THILAKARATHNA Maroay PHLERNJAI School of manufacturing systems and Mechanical Engineering Sirindhorn International Institute of TechnologyThammasat University

Background With the increasing prominence of hand and finger motion tracking in virtual reality(VR) applications and rehabilitation studies, data gloves have emerged as a prevalent solution. In this study, we developed an innovative, lightweight, and detachable data glove tailored for finger motion tracking in VR environments. Methods The glove design incorporates a potentiometer coupled with a flexible rack and pinion gear system, facilitating precise and natural hand gestures for interaction with VR applications. Initially, we calibrated the potentiometer to align with the actual finger bending angle, and verified the accuracy of angle measurements recorded by the data glove. To verify the precision and reliability of our data glove, we conducted repeatability testing for flexion(grip test) and extension(flat test), with 250 measurements each, across five users. We employed the Gage Repeatability and Reproducibility to analyze and interpret the repeatable data. Furthermore, we integrated the gloves into a Steam VR home environment using the Open Glove auto-calibration tool. Conclusions The repeatability analysis revealed an aggregate error of 1.45 degrees in both the gripped and flat hand positions. This outcome was notably favorable when compared with the findings from assessments of nine alternative data gloves that employed similar protocols. In these experiments, users navigated and engaged with virtual objects, underlining the glove's exact tracking of finger motion. Furthermore, the proposed data glove exhibited a low response time of 17–34 ms and back-drive force of only 0.19 N. Additionally, according to a comfort evaluation using the Comfort Rating Scales, the proposed glove system is wearable, placing it at the WL1 level.

关键词： Finger tracking Virtual reality Data glove Hand gesture Rack and pinion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

End-to-end Identification of Autoregressive with Exogenous Input(ARX)Models Using Neural Networks

引用

Machine Intelligence research 2025年第1期22卷 117-130页

作者： Aoxiang Dong Andrew Starr Yifan Zhao School of Aerospace Transport and ManufacturingCranfield UniversityCranfield MK430ALUK

Traditional parametric system identification methods usually rely on apriori knowledge of the targeted system,which may not always be available,especially for complex *** neural networks(NNs)have been increasingly adopted in system iden-tification,most studies have failed to derive interpretable parametric models for further *** this paper,we propose a novel end-to-end autoregressive with exogenous input(ARX)model identification framework using *** order-wise neural network structure is introduced and trained using a multitask learning approach to simultaneously identify both the model terms and coefficients of the ARX *** testing with various neural network backbones and training data sizes in different scenarios,we empirically demonstrate that the proposed framework can effectively identify an arbitrary stable ARX model with finite simulation training *** study opens up a new research opportunity for parametric system identification by harnessing the power of deep learning.

关键词： Linear system identification and estimation learning systems model structure determination multivariable systems deep learning.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in reactive air wetting and brazing of engineering ceramics

引用

Journal of Advanced Ceramics 2025年第1期14卷 1-21页

作者： Mingfen Zhang Shunjian Xu Fabrizio Valenza Xiangzhao Zhang Guiwu Liu Guanjun Qiao School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of Intelligent manufacturing Huzhou CollegeHuzhou 313000China National research Council Institute of Condensed Matter Chemistry and Technologies for EnergyCNR-ICMATEGenoa 16149Italy

The reactive air brazing(RAB)process of ceramics was developed in the early 2000s because high-temperature electrochemical devices,such as solid oxide fuel cells(SOFCs),gas separators,reformers,and ion transport membrane systems,are increasingly ***,the reactive air wetting(RAW)and RAB of oxide ceramics have been *** from the introduction of the advantages of the RAB process,the thermal expansion coefficients(TECs)of related materials,and the estimation of the TECs of Ag-based composite fillers,the RAW and RAB of ceramics are reviewed by classifying the employed ceramic materials,which mainly include yttria-stabilized zirconia(YSZ),perovskite oxides,Al2O3,and nonoxide *** particular,the RAW and RAB processes,interfacial microstructures,reaction products,and joint reliability(including joint strength,fracture energy,gas tightness,and high-temperature aging resistance)are highlighted for understanding interfacial behavior and joint performance and developing application-oriented brazing ***,some helpful conclusions are drawn after summarizing the RAB of oxide *** prospects for RAB of SiC and high-entropy oxide ceramics are proposed after summarizing the RAB of oxide and nonoxide ceramics,and several aspects are proposed for promoting the development and application of RAB technology.

关键词： brazing wetting interfaces microstructures joint reliability

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

MoS2 synaptic transistor with one-step manufacture

引用

Science China(Information Sciences) 2025年第1期68卷 357-365页

作者： Yihao GUO Yang WANG Wenjie DENG Yi WU Jingtao LI Kexin LI Yuehui ZHAO Songlin YU Xiaoting WANG Yongzhe ZHANG Hui YAN Key Laboratory of Optoelectronics Technology of Education Ministry of China Faculty of Information TechnologyBeijing University of Technology Key Laboratory of Advanced Functional Materials Ministry of Education Faculty of Materials and ManufacturingBeijing University of Technology The 11th research Institute of Electronics Technology Group Corporation

The synaptic transistor,which is a neuromorphic device with brain-like functions,has garnered significant attention due to characteristics such as low energy consumption,high integration,multiple functions,and high computational ***,the current synaptic transistor possesses a complicated structure and involves complex manufacturing steps,which is not conducive to low-cost,large-scale bionic ***,we introduce a simple MoS2synaptic transistor exhibiting robust synaptic *** transistor utilizes magnetron sputtering manufacture to combine the process of device metal electrode deposition and the introduction of defect states,which helps streamline the manufacturing process into a single *** long-term potentiation and long-term depression in photoelectric coordination are initially ***,biological functions,such as double pulse facilitation and the transformation behavior of short-term memory to long-term memory,are thoroughly evaluated,along with learning-forgetting-relearning ***,the device exhibits robust synaptic plasticity until incident light angles down to 30° to imitate the multi-to-one axon-cellular ***,a classical simulation of Pavlov's dog conditioned reflex is demonstrated along with the multiview extraction *** experimental results demonstrate a promising synaptic transistor with a simple structure,manufacturing technique,and excellent *** further indicates the potential for large-scale integration of bionic neuromorphic systems.

关键词： process optimization artificial synaptic device one-stepmanufacture synaptic plasticity bionic simulation

来源：

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Disordered hyperuniformity and thermal transport in monolayer amorphous carbon

引用

Science China(Physics,Mechanics & Astronomy) 2025年第2期68卷 145-152页

作者： Nianjie Liang Yuxi Wang Bai Song Department of Energy and Resources Engineering Peking UniversityBeijing 100871China Department of Advanced manufacturing and Robotics Peking UniversityBeijing 100871China

Disordered hyperuniformity(DHU)is a recently discovered novel state of amorphous systems characterized by strongly suppressed density fluctuations at large length scales as in crystalline materials,which offers great potential for achieving unusual mechanical,electronic,and photonic ***,despite the fundamental and technological importance of thermal transport in amorphous solids,the effect of DHU remains largely ***,we theoretically study thermal transport in a class of two-dimensional DHU materials—monolayer amorphous carbon(MAC).Beginning with a perfect graphene lattice,we continuously apply Stone-Wales transformations to generate a series of MAC models with varied degrees of disorder and defects,which are quantified through comprehensive structural analysis including the so-called hyperuniformity index(H),where a smaller H indicates a higher degree of ***,we conduct molecular dynamics simulations to obtain the thermal conductivity(κ).A significant correlation between the thermal transport behavior and degree of hyperuniformity is observed,with the room-temperatureκdecreasing from 26.3 to 5.3 W m^(-1)K^(-1)while H is tuned from 0.0004 to ***,two distinct transport regimes are identified,including a nearly-DHU regime at small H(<0.005)whereκdrops sharply and a non-DHU region at larger H whereκbecomes relatively ***-resolved analysis reveals longer lifetime and higher participation ratio for the heat carriers in nearly-DHU MAC,implying that the hidden long-range correlations could support extended modes that enhance *** work highlights the impact of DHU on the thermal properties of amorphous materials and represents a conceptual advancement that is worthy of future exploration.

关键词： disordered hyperuniformity thermal transport amorphous material two-dimensional monolayer amorphous carbon

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Thermal effects on wear behavior of additively manufactured NiTi shape memory alloys

引用

Chinese Journal of Aeronautics 2025年第1期38卷 147-164页

作者： Xianghui HUANG Nan KANG Pei WANG Mohamed EL MANSORI Arts et Metiers Institute of Technology MSMPHESAM UniversitéChâlons-en-Champagne 51006France Henan Key Laboratory of High-Performance Carbon Fiber Reinforced Composites Institute of Carbon Matrix CompositesHenan Academy of SciencesZhengzhou 450046China Texas A&M Engineering Experiment Station Institute for Manufacturing SystemsCollege StationTX 77843USA

NiTi alloys fabricated by laser powder bed fusion(LPBF)additive manufacturing technology not only address the compositional instability resulting from complex processes but also solve the challenges of difficult machining of intricate aerospace ***,there are very few reports on the wear behavior of LPBF-NiTi *** the present work,the effects of microstructure and thermal treatment,including heat treatment and frictional heat,on the wear behavior of LPBF-NiTi alloy and 100Cr6 ball were analyzed through a series of tribological experiments with different sliding *** the average sliding speed increases(0.079–0.216 m/s),the wear rate of the as-built and heat-treated samples tends to decrease in the range of 2.69×10^(-3)–0.97×10^(-3)mm^(3)/*** the heat-treated LPBF-NiTi alloy is 46%harder than the as-built alloy is,the latter has a higher toughness(505 MJ/m^(3))and greater transformation strain of SIM(0.097).This leads to a coupling effect of heat treatment and sliding speed on the wear *** addition,the wear track morphologies under different sliding speeds are asymmetric due to the 24% greater acceleration at the far end from the motor and the 2.15 mm deviation between the maximum speed position and the geometric center of the *** wear modes of the as-built and heat-treated samples included adhesive,abrasive and delamination ***,the wear morphologies and dominant wear modes change with the frictionally caused heat release induced by the sliding speed.

关键词： Additive manufacturing Laser powder bed fusion NiTi alloys Wear resistance Sliding speed

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：