检索结果-内蒙古大学图书馆

arXiv 2024年

作者： Kishida, Shoki Okamoto, Norihiko L. Katsube, Ryoji Nagaoka, Akira Nose, Yoshitaro Department of Materials Science and Engineering Kyoto University Kyoto606-8501 Japan Institute for Materials Research Tohoku University Sendai980-8577 Japan Department of Materials Process Engineering Nagoya University Nagoya464-8603 Japan Electrical and Electronic Engineering Program University of Miyazaki Miyazaki889-2192 Japan

Practical applications of thermoelectric (TE) materials are constrained by less developments of high-performance n-type materials compared to their p-type counterparts. Chalcopyrite CdSnAs2 is a promising n-type semiconductor for thermoelectrics from its narrow bandgap around 0.2 eV and exceptionally high electron mobility of 103−104 cm2 V−1s−1. In this study, we investigated the crystal growth, microstructure, and thermoelectric properties of CdSnAs2. Contrary to conventional theory of unidirectional melt growth, CdSnAs2 samples at higher cooling rates exhibited better crystallinity, while some cracks were observed in samples cooled more slowly. Thermal analyses clarified that a phase transition from sphalerite to chalcopyrite occurred after solidification in the case of slow cooling, leading to dislocations and cracks due to the lattice mismatch between phases. The analysis at rapid cooling suggested that supercooling lowers the solidification temperature and produces an appropriate microstructure. Consequently, the sample grown at the highest cooling rate (7.6 ∘C min−1) achieved an ultrahigh power factor of 3180 μW m−1K−2 at 600 K and a peak zT of 0.62 at 682 K. In the power factor, CdSnAs2 surpasses conventional binary n-type TE materials such as SnSe and PbTe, proving that CdSnAs2 is a high potential candidate for mid-temperature TE applications. © 2024, CC BY-NC-ND.

关键词： Lattice mismatch

来源：评论

学校读者我要写书评

暂无评论

Underwater Robot Navigation Through Compensation of Sensor Misalignment in Non-linear Space

Underwater Robot Navigation Through Compensation of Sensor M...

引用

International Conference on Control, Automation and Systems ( ICCAS)

作者： Da Bin Jeong Woong Choi Nak Yong Ko Department of Electronic Engineering Interdisciplinary Program in IT- Bio Convergence System Graduate School Chosun University Gwangju Republic of Korea College of ICT Construction Welfare Convergence Kangnam University Gyeonggi-do Republic of Korea Department of Electronic Engineering Interdisciplinary Program in IT-Bio Convergence System Chosun University Gwangju Republic of Korea

This paper presents a novel approach to estimate and compensate for the misalignment between the Inertial Measurement Unit (IMU) and Doppler Velocity Log (DVL) sensors. Estimating the location and attitude of an ROV usually combines the attitude by IMU and the velocity by the DVL provided in the sensor coordinate system. The attitude is regarded as the attitude of the ROV and the velocity in the sensor coordinate frame is converted to the velocity in the inertial coordinate frame. Misalignment in the DVL and IMU causes errors in the converted velocity and results in the degradation of the navigation performance. The proposed method represents the misalignment using unit quaternion. Especially, the method utilizes the Lie theory to deal with the operations on unit quaternions which constitute a Lie group, called the 3-sphere group. Simulation and testing of the method in a marine environment validate its effectiveness and practical applicability.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A weighted multivariate fuzzy time series method for multiple output high-dimensional time series forecasting in IoT applications

A weighted multivariate fuzzy time series method for multipl...

引用

2024 IEEE Latin American Conference on Computational Intelligence, LA-CCI 2024

作者： Bitencourt, Hugo Vinicius De Oliveira Lucas, Patricia Orang, Omid Silva, Petronio Guimaraes, Frederico Gadelha Universidade Federal de Minas Gerais Graduate Program in Electrical Engineering Belo Horizonte31270-901 Brazil Instituto Federal Do Norte de Minas Gerais Salinas Brazil Universidade Federal de Minas Gerais Department of Computer Science Belo Horizonte31270-901 Brazil Instituto Federal Do Norte de Minas Gerais Januária Brazil

ISBN: (纸本)9798350374575

In Internet of Things (IoT) applications, data flows are continuous streams of high-dimensional time series that aggregate various data sources. In this context, decision-making processes frequently encompass multiple factors and criteria that demand forecasting these time series. This paper introduces MO-WMVFTS, a novel multiple-input multiple-output (MIMO) fuzzy time series (FTS) method for tackling this complex scenario. MO-WMVFTS is a hybrid forecasting method that fuses weighted multivariate FTS (WMVFTS) with embedding transformations, designed for IoT applications. To assess the performance of the proposed method, it was applied to the prediction of energy consumption in smart homes and air quality in smart cities. Here, three real-world datasets are used to assess the validity of our proposed approach, and the results obtained are highly competitive when compared to other existing methods. © 2024 IEEE.

关键词： Smart homes

来源：评论

学校读者我要写书评

暂无评论

Crack Catcher Ai – Enabling Smart Fracture Mechanics Approaches for Damage Control of Thin Silicon Cells or Wafers

SSRN

引用

SSRN 2024年

作者： Budiman, Arief Suriadi Putri, Dianing Novita Nurmala Candra, Henry Djuana, Endang Sari, Tyas Kartika Aji, Daisman P.B. Putri, Larasati Rizky Sitepu, Elioenai Speaks, Derrick Pasang, Tim Klamath FallsOR97601 United States Klamath FallsOR97601 United States Electrical Engineering Department Faculty of Industrial Technology Universitas Trisakti Jakarta11440 Indonesia Mechanical Engineering Department Faculty of Industrial Technology Universitas Trisakti Jakarta11440 Indonesia Industrial Engineering Department BINUS Graduate Program-Master of Industrial Engineering Bina Nusantara University Jakarta11480 Indonesia

Silicon has been one among a few key technologically important materials especially in our modern world. Silicon, especially in its current most useful forms (thin layers), is a brittle material by nature. Thin silicon cells crack easily during manufacturing assembly. Every crack is a defect in any PV manufacturing lines, and if let to grow/propagate it will lead to reliability and quality issues with time. Nevertheless, the global silicon solar PV industry is aggressively reducing the cost of solar PV systems through cutting down the thickness of silicon solar cells. Cell cracks immediately lower PV module efficiency and can lead to premature aging of the entire module. The "Crack Catcher AI" was our research joint collaboration’s entry in the department of Energy (DOE)’s American-Made Solar Innovation competition in 2022 (Round 6) which later was selected as the national semifinalists and won an award announced by DOE in December 2022. It uses smart stress sensing and smart fracture prediction approaches utilizing fundamental fracture mechanics and big data analytics to reduce crack defects and enhance long-term durability/reliability of PV products/devices. Smart Stress Sensing uses a novel laser-based curvature methodology for fast in-line stress metrology in manufacturing lines. Smart Fracture Prediction uses Artificial Intelligence (AI) for defect control metrology and yield enhancement in PV production lines. It is based on monocrystalline silicon used in solar PV industries, but all scientific principles utilized and technological innovations developed in this article would be applicable as well for single crystal silicon semiconductor wafers. © 2024, The Authors. All rights reserved.

关键词： Cracks

来源：评论

学校读者我要写书评

暂无评论

Transient Analysis Of Molten Pool With Applying Axial Magnetic Field In Tig Arc Welding

Transient Analysis Of Molten Pool With Applying Axial Magnet...

引用

IEEE International Conference on Plasma Science (ICOPS)

作者： Y. Nemoto M. Takagi H. Morishita Y. Suzuki Z. Ren T. Iwao Electrical Engineering and Chemistry Graduate School of Integrative Science and Engineering Tokyo City University Setagaya Japan Department of Electrical Electronic and Communication Engineering Faculty of Science and Engineering Tokyo City University Setagaya Japan

ISBN: (纸本)9781665479264

In TIG arc welding, technicians use a rolling technique to ensure high quality welds. In this rolling technique, the cathode is rotated while welding. However, the rolling method is difficult and complicated. As a countermeasure, it has been proposed that a magnetic field is applied to rotate the arc. When a magnetic field is applied, it is difficult to measure the arc behavior and the convection of the molten pool. Hence, numerical methods for the arc have been developed [1] , [2] . Moreover, the arc behavior is analyzed with applying magnetic field [3] . In this paper, molten pool with applying axial magnetic field in TIG arc welding transient was analyzed. Specifically, analytical model was constructed for solid, liquid, and gas, and four forces were calculated for the molten pool. The four forces are drag force of plasma flow, shear stress of Marangoni effect, buoyancy, and electromagnetic force. As a result, a spiral flow velocity was generated in the molten pool with the application of axial magnetic field. In addition, the flow velocity of the molten pool was more affected by the axial magnetic field than that of the arc. Therefore, it was possible that transient analysis of molten pool with applying axial magnetic field in TIG arc welding.

关键词： Spirals Magnetic field measurement Welding Magnetic liquids Solids Plasmas Behavioral sciences

来源：评论

学校读者我要写书评

暂无评论

A Comparative Analysis of Terminal and Second Order Sliding Mode Controllers for Full Bridge Single Phase Inverters

A Comparative Analysis of Terminal and Second Order Sliding ...

引用

Annual Conference of Industrial electronics Society

作者： Samet Ayik Sevki Demirbas Naki Güler Ugur Fesli Department of Electrical and Electronics Engineering Graduate School of Natural and Applied Sciences Gazi University Ankara Turkey Electrical and Electronics Engineering Department Gazi University Ankara Turkey Renewable Energy and Smart Grid Application and Research Center Gazi University Ankara Turkey Electronic and Automation Department Technical Sciences Vocational School Gazi University Ankara Turkey

ISBN: (数字)9781665464543

ISBN: (纸本)9781665464550

This study presents a comprehensive analysis of Terminal Sliding Mode Control (TSMC) and Super Twisting Sliding Mode Control (SOSMC), in the context of full-bridge single-phase inverters. The controllers are designed to output current control of the single-phase inverter. Simulation studies are performed on MATLAB/Simulink platform to investigate the dynamic responses, steady-state error, ripple magnitude and total harmonic distortion (THD). The results indicate that TSMC offers faster response times but suffers from significant undershoot and higher steady-state errors. Conversely, SOSMC demonstrates superior performance with lower steady-state error, reduced ripple and significantly less harmonic distortion. These findings highlight the relative advantages and disadvantages of each control strategy, providing valuable insights for their application in both academic research and industrial practice.

关键词： Bridges Industrial electronics Total harmonic distortion Harmonic analysis Inverters Steady-state Time factors Reliability MATLAB Sliding mode control

来源：评论

学校读者我要写书评

暂无评论

A Multi-phase Deep Learning Approach for Predicting HCC Response to TACE using Complete Computed Tomography

A Multi-phase Deep Learning Approach for Predicting HCC Resp...

引用

Data Science and engineering in Healthcare, Medicine and Biology, IEEE EMBS Special Topic Conference on

作者： Shun Cheng Chang Chien Fu Liu Marta Misztal Yi Hsien Hsieh Che Lin Graduate Institute of Communication Engineering National Taiwan University (NTU) Taiwan School of Electronic Engineering and Computer Science Queen Mary University of London UK Department of Electrical Engineering NTU Taiwan Center for Computational and Systems Biology and Center for Biotechnology NTU Taiwan Smart Medicine and Health Informatics Program NTU Taiwan

In this research study, we compare the predictive performance of two advanced deep learning-based models in order to provide a solution to TACE (Transarterial Chemoembolization) response prediction in HCC (Hepatocellular Carcinoma) patients. Using entire abdominal CT scans enabled a broader perspective available for the model, eliminating the need for segmentation during the preprocessing. Making use of both single-phase and multi-phase CT imaging, we have used DenseNet121 and have obtained an accuracy of 80% for the multi-phase *** Relevance: The ability to predict the effectiveness of TACE treatment prior to its administration makes it possible to provide a better decision-making aid for physicians and patients.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Optical Study on Temperature-Dependent Absorption Edge of γ-InSe-Layered Semiconductor

引用

Applied Sciences (Switzerland) 2024年第15期14卷 6676页

作者： Wu, Wen-Te Tiong, Kwong-Kau Tan, Shih-Wei Hu, Sheng-Yao Lee, Yueh-Chien Chen, Ruei-San Wu, Chia-Ti Department of Electrical Engineering National Taiwan Ocean University Keelung202 Taiwan Department of Electrical Engineering Lunghwa University of Science and Technology Guishan Taoyuan333 Taiwan Department of Electronic Engineering Lunghwa University of Science and Technology Guishan Taoyuan333 Taiwan Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei106 Taiwan Department of Telecommunication Engineering National Kaohsiung University of Science and Technology Kaohsiung811 Taiwan

We have studied the variations in the temperature-dependent absorption edge of a bulk InSe-layered semiconductor using photoconductivity (PC) measurements. From both the X-ray diffraction (XRD) and Raman experimental results, the structural phase of the as-prepared InSe sample was confirmed to be γ-polytype. Upon heating from 15 K to 300 K, the absorption edge of PC spectra was found to shift significantly toward lower energy, and the absorption edge as a function of temperature was further analyzed by the Varshni’s relationship and Bose–Einstein empirical equation. The Urbach energy as a function of temperature was obtained by fitting the absorption tail below the absorption coefficient of the PC spectrum, and the effective phonon energy can be derived from the temperature-dependent steepness parameter associated with Urbach energy. Our study indicates that the broadening of the absorption edge in the as-synthesized bulk γ-InSe is caused by a combination of electron/exciton–phonon interactions and thermal/structural disorder. © 2024 by the authors.

关键词： Photoconductivity

来源：评论

学校读者我要写书评

暂无评论

An In-depth Analysis of Kerberos and Blockchain Integration on VANETs’ Security and Performance

An In-depth Analysis of Kerberos and Blockchain Integration ...

引用

IEEE International Conference on Consumer electronics-Taiwan (ICCE-TW)

作者： Maya Rahayu Md. Biplob Hossain Samsul Huda Md. Arshad Ali Yuta Kodera Yasuyuki Nogami Graduate School of Environmental Life Natural Science and Technology Okayama University Japan Electrical Engineering Department Politeknik Negeri Bandung Indonesia Electrical and Electronic Engineering Department Khwaja Yunus Ali University Bangladesh Green Innovation Center Okayama University Japan Faculty of CSE Hajee Mohammad Danesh Science and Technology University Bangladesh

ISBN: (数字)9798350386844

ISBN: (纸本)9798350386851

Vehicular Ad-Hoc Networks (VANETs) are essential for modern transportation systems, but their openness exposes them to cyber threats. Authentication in VANETs is challenged by dynamic topology and high mobility, requiring robust mechanisms. Previously, we proposed an authentication system for VANETs using blockchain and Kerberos. Kerberos authenticator messages are stored in a blockchain ledger accessible to the Trusted Authentication Server (TAS) and Roadside Units (RSUs), resulting in minimal signaling overhead and authentication delay. However, the performance of the blockchain itself was not evaluated. In this paper, we investigate the blockchain’s performance in a simulated VANET environment with 100 vehicles, 4 RSUs, and 1 TAS. Using Ethereum blockchain and Omnet++ simulation, we assess the blockchain feasibility in VANET authentication scenarios.

关键词： Smart contracts Urban areas Authentication Vehicular ad hoc networks Blockchains Delays Cryptocurrency

来源：评论

学校读者我要写书评

暂无评论

Low-Capacitance Static Compensators: Prospects and Challenges

Low-Capacitance Static Compensators: Prospects and Challenge...

引用

Annual Conference of Industrial electronics Society

作者： Ong Jing Xian Qingxiang Liu Ezequiel Rodriguez Glen G. Farivar Josep Pou School of Electrical and Electronic Engineering Nanyang Technological University Singapore Interdisciplinary Graduate Programme Energy Research Institute at NTU Nanyang Technological University Singapore Energy Research Institute at NTU (ERI@N) Nanyang Technological University Singapore Department of Electrical and Electronic Engineering University of Melbourne Australia

Cascaded H-bridge (CHB) static compensator (Stat-Com) enhances stability of the electricity power grid, which is becoming ever increasingly vulnerable as a consequence of replacing fossil fuel-based synchronous generators by intermitten renewable sources. A CHB StatCom needs large dc capacitors in the submodules to operate, which is a major drawback that hinders a widespread use of this technology. In order to overcome this drawback, the low-capacitance StatCom (LC-StatCom) technology was developed. Other than reducing the capacitors size, improvement in power quality and reduced losses were listed as further advantages of the LC-StatCom. On the other hand, control challenges and reduced stable operating range are the main challenges of this technology. This study aims to provide a better understanding of the prospects and challenges of the LC-StatCom technology as compared to the conventional $C$ HB StatComs.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：