检索结果-内蒙古大学图书馆

International electrical engineering Congress (iEECON)

作者： Payu Chakunna Nopphadon Phusam Pisit Mahatthanajatuphat Wilaiporn Lee Thanakarn Suangun School of Engineering University of Phayao Phayao Thailand Regular Program in Mathematics-Science Yothinburana School Bangkok Thailand Department of Electrical and Computer Engineering King Mongkut's University of Technology North Bangkok Bangkok Thailand

ISBN: (数字)9798331543952

ISBN: (纸本)9798331543969

This research demonstrates the improvement in antenna gain by utilizing an EBG reflector. The EBG reflector includes a unit cell with grooves shaped like the letters M and W to mitigate surface waves at a frequency of 2.45 GHz. The suggested EBG reflector is constructed on an FR-4 substrate exhibiting a uniform dielectric constant of 4.3, a loss tangent of 0.025, and a thickness of 1.6 mm. Furthermore, the impact of boosting the antenna gain can be analyzed by the reflection phase diagram, which exhibits values ranging from +90° to -90° at the resonant frequency of the reflector. The proposed EBG reflector comprises 5x5 unit cells. The testing results of the reflector's performance, when integrated with a general dipole antenna, indicate that it can effectively respond to the resonant frequency of 2.45 GHz, with a |S 11 | level below -10 dB within the frequency range of 2.2 GHz to 2.6 GHz, thereby adequately covering the IEEE 802.11 b/g/n band. The suggested EBG reflector exhibits a gain of around 6.5 dBi at 2.45 GHz, indicating its efficacy in enhancing gain relative to the standard PEC reflector. Moreover, the radiation pattern is also directional.

关键词： Slot antennas Dipole antennas Resonant frequency Reflector antennas Metamaterials Reflection Gain Standards Periodic structures Antenna radiation patterns

来源：评论

学校读者我要写书评

暂无评论

Integrated Preparation of Photonic Spin-Orbit Qudits

Integrated Preparation of Photonic Spin-Orbit Qudits

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Haoqi Zhao Yichi Zhang Zihe Gao Jieun Yim Shuang Wu Natalia M. Litchinitser Li Ge Liang Feng Department of Electrical and Systems Engineering University of Pennsylvania Philadelphia PA USA Department of Materials Science and Engineering University of Pennsylvania Philadelphia PA USA Department of Electrical and Computer Engineering and Department of Physics Duke University Durham NC USA Department of Engineering Science and Physics College of Staten Island CUNY Staten Island NY USA The Graduate Center CUNY New York NY USA

ISBN: (纸本)9798350369311

Preparing and manipulating N-dimensional flying qudits as well as subsequently establishing their entanglement are still challenging tasks. Here, using an integrated approach, we explore the synergy from two degrees of freedom of light, spatial mode and polarization, to generate, encode, and manipulate flying photon qudits in a four-dimensional Hilbert space with high quantum fidelity, intrinsically enabling enhanced noise resilience and higher quantum data rates.

关键词： Integrated optics Polarization Optical polarization Laser noise Laser modes Hilbert space Optical noise Electro-optical waveguides Photonics Resilience

来源：评论

学校读者我要写书评

暂无评论

Hotel Information System Management Audit Using COBIT 2019 - APO12

Hotel Information System Management Audit Using COBIT 2019 -...

引用

Innovation in Technology (INOCON), IEEE International Conference for

作者： Joy Nashar Utamajaya Suhono Harso Supangat Ford Lumban Gaol Benny Ranti BINUS Graduate Program School of Information System BINUS University Jakarta Indonesia School of Electrical Engineering and Informatic Bandung Institute of Technology Bandung Indonesia Computer Science Department BINUS Graduate Program Computer Science Bina Nusantara University Jakarta Indonesia Computer Science Department Faculty of Computer Science University of Indonesia Depok Indonesia

In general, public or private organizations or companies have used information-based technology as a support to improve business performance to be more effective and efficient in order to achieve a company’s business goals. Given the large contribution of information technology in the application of hotel applications as a supporting information system, it is a vital system that must avoid risks that can hinder and cause harm to the hotel management business processes. Therefore, it is necessary to carry out risk management using the COBIT 5 framework to manage possible risks that may occur based on the APO12 (Manage Risk) domain. From the evaluation results of the data obtained through observation and interviews as well as the calculation of the results of the questionnaire based on 6 APO12 subdomains, the results of the risk management level capability assessment in hotel applications are still at level 3 or have reached the level of established process with the target to be achieved at level 4 resulting in a gap of 1 level. Based on the results obtained, it is necessary to propose recommendations that can be used by hotels in improving the application of information technology risk management so that in the future it can achieve the expected target level so that the APO12 level of capability can increase and become more optimal.

关键词： Technological innovation Companies Risk management Information technology Interviews Information systems

来源：评论

学校读者我要写书评

暂无评论

Molten flux growth of single crystals of quasi-1D hexagonal chalcogenide BaTiS3

arXiv

引用

arXiv 2024年

作者： Chen, Huandong Singh, Shantanu Mei, Hongyan Ren, Guodong Zhao, Boyang Surendran, Mythilli Wang, Yan-Ting Mishra, Rohan Kats, Mikhail A. Ravichandran, Jayakanth Mork Family Department of Chemical Engineering and Materials Science University of Southern California Los AngelesCA United States Department of Electrical and Computer Engineering University of Wisconsin-Madison MadisonWI United States Institute of Materials Science & Engineering Washington University in St. Louis St. LouisMO United States Core Center for Excellence in Nano Imaging University of Southern California Los AngelesCA United States Department of Mechanical Engineering and Materials Science Washington University in St. Louis St. LouisMO United States Department of Materials Science and Engineering University of Wisconsin-Madison MadisonWI United States Ming Hsieh Department of Electrical and Computer Engineering University of Southern California Los AngelesCA United States

BaTiS3, a quasi-1D complex chalcogenide, has gathered considerable scientific and technological interest due to its giant optical anisotropy and electronic phase transitions. However, the synthesis of high-quality BaTiS3 crystals, particularly those featuring crystal sizes of millimeters or larger, remains a challenge. Here, we investigate the growth of BaTiS3 crystals utilizing a molten salt flux of either potassium iodide, or a mixture of barium chloride and barium iodide. The crystals obtained through this method exhibit a substantial increase in volume compared to those synthesized via the chemical vapor transport method, while preserving their intrinsic optical and electronic properties. Our flux growth method provides a promising route towards the production of high-quality, large-scale single crystals of BaTiS3, which will greatly facilitate advanced characterizations of BaTiS3 and its practical applications that require large crystal dimensions. Additionally, our approach offers an alternative synthetic route for other emerging complex chalcogenides. © 2024, CC BY.

关键词： Electronic properties

来源：评论

学校读者我要写书评

暂无评论

Superconductivity from On-Chip Metallization on 2D Topological Chalcogenides

引用

Physical Review X 2024年第2期14卷 021051-021051页

作者： Yanyu Jia Guo Yu Tiancheng Song Fang Yuan Ayelet J. Uzan Yue Tang Pengjie Wang Ratnadwip Singha Michael Onyszczak Zhaoyi Joy Zheng Kenji Watanabe Takashi Taniguchi Leslie M. Schoop Sanfeng Wu Department of Physics Princeton University Princeton New Jersey 08544 USA Department of Electrical and Computer Engineering Princeton University Princeton New Jersey 08544 USA Department of Chemistry Princeton University Princeton New Jersey 08544 USA Research Center for Electronic and Optical Materials National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan

Two-dimensional (2D) transition metal dichalcogenides (TMDs) is a versatile class of quantum materials of interest to various fields including, e.g., nanoelectronics, optical devices, and topological and correlated quantum matter. Tailoring the electronic properties of TMDs is essential to their applications in many directions. Here, we report that a highly controllable and uniform on-chip 2D metallization process converts a class of atomically thin TMDs into robust superconductors, a property belonging to none of the starting materials. As examples, we demonstrate the introduction of superconductivity into a class of 2D air-sensitive topological TMDs, including monolayers of Td−WTe2, 1T′−MoTe2, and 2H−MoTe2, as well as their natural and twisted bilayers, metallized with an ultrathin layer of palladium. This class of TMDs is known to exhibit intriguing topological phases ranging from topological insulator, Weyl semimetal to fractional Chern insulator. The unique, high-quality two-dimensional metallization process is based on our recent findings of the long-distance, non-Fickian in-plane mass transport and chemistry in 2D that occur at relatively low temperatures and in devices fully encapsulated with inert insulating layers. Highly compatible with existing nanofabrication techniques for van der Waals stacks, our results offer a route to designing and engineering superconductivity and topological phases in a class of correlated 2D materials.

关键词： Anyons Topological superconductors Twistronics Superconducting devices Superconductors Topological materials Transition metal dichalcogenides Twisted heterostructures Crystal growth Dilution refrigerator Resistivity measurements

来源：评论

学校读者我要写书评

暂无评论

Small Polaron-Induced Ultrafast Ferroelectric Restoration in BiFeO3

引用

Physical Review X 2025年第2期15卷 021046-021046页

作者： Wenfan Chen Tian Wang Chun-Chieh Yu Yuancheng Jing Xiaosong Li Wei Xiong Materials Science and Engineering Program University of California San Diego La Jolla California 92093 USA Department of Chemistry University of Washington Seattle Washington 98195 USA Department of Chemistry University of California San Diego La Jolla California 92093 USA Department of Electrical and Computer Science Engineering University of California San Diego La Jolla California 92093 USA

In this report, we apply a suite of ultrafast spectroscopic techniques and advanced calculations to reveal the interplay between electronic and lattice degrees of freedom in ferroelectric BiFeO3. Using transient sum frequency generation spectroscopy, which is sensitive to electronic polarizations, we observe a transient electronic dipole reduction upon optical excitation which recovers at 0.5 and 10 ps timescale. The time-dependent density functional theory calculation reveals that both ligand-metal charge transfer and local excitation transition occurred upon photo excitation. To reveal the nature of electronic dipole restoration, we employ transient extreme ultraviolet (EUV) spectroscopy—an element-specific ultrafast technique that follows charge dynamics of Bi, Fe, and O altogether. The transient EUV dynamics observed both ultrafast free charge carrier relaxation to excitons, as well as polaron formation. However, a timescale comparison suggests that only the polaron formation is responsible for the 0.5 ps electronic dipole restoration, whereas the faster electronic relaxation does not contribute to the ferroelectric property changes. Multireference configuration interaction calculation further corroborates this result by showing both Fe and Bi atoms shift from the ground state equilibrium—leading to the polaron formation. Our result disentangles the multidegrees of freedom in ultrafast ferroelectric modulation and identifies the pivotal motion—a local polaron formation—for the fast ferroelectric recovery. It provides crucial insights on the specific lattice distortion that could modulate properties or phase transitions of condensed matter materials.

关键词： Light polarization

来源：评论

学校读者我要写书评

暂无评论

Multiphysics Design and Optimization of a Rare-Earth Free, Manganese Bismuth Based, Surface Mounted Permanent Magnet Machine

Multiphysics Design and Optimization of a Rare-Earth Free, M...

引用

IEEE Transportation Electrification Conference and Expo (ITEC)

作者： Mohendro Kumar Ghosh Brandon Grainger Scott McElhinny Ryan Brody Jun Cui Andrew Sherman Paul Ohodnicki Department of Mechanical Engineering and Materials Science University of Pittsburgh Pittsburgh PA USA Department of Electrical and Computer Engineering University of Pittsburgh Pittsburgh PA USA Department of Materials Science and Engineering Iowa State University Ames Iowa USA Powdermet Inc. Euclid Ohio USA

This paper deals with the feasibility of rare earth (RE) free manganese bismuth (MnBi) permanent magnets as an alternative material in electric vehicle (EV) motor applications and performance evaluation at high temperature. Neodymium Iron Boron (NdFeB) permanent magnets are typically used in permanent magnet synchronous machines (PMSMs) for EV applications for achieving high power, high torque density and high efficiency due to high remanent flux density $(\boldsymbol{B}_{\boldsymbol{r}})$ and maximum energy product $(\boldsymbol{BH}_{\boldsymbol{max}})$ . Market dominance of NdFeB is hindered significantly due to the supply chain limitations of rare-earth elements which also have the tendency to experience significant price fluctuations. This has triggered substantial efforts in investigating new, alternative magnetic materials containing rare earth free elements. Although ferrite magnets have been explored as alternative choices in the past, ferrites have inferior magnetic properties compared to the emerging MnBi magnets. In this paper, a finite element-based multi-physics design and optimization framework of a SPM machine is conducted evaluating MnBi and NdFeB magnets including electromagnetic performance at high temperatures with thermal and mechanical validation.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Machine Learning for Fatigue Estimation and Prediction "An Introduction Study" 7th

Machine Learning for Fatigue Estimation and Prediction "An I...

引用

7th International Conference on Advancements of Medicine and Health Care through Technology, MEDITECH 2020

作者： Aljihmani, Lilia Ursutiu, Doru Cornel, Samoila Qaraqe, Khalid Department of Electrical and Computer Engineering Texas A&M University at Qatar Doha23874 Qatar Department of Electronics and Computers Transylvania University of Brasov Braşov500036 Romania Department of Materials Science Transylvania University of Brasov Braşov500036 Romania

ISBN: (纸本)9783030935634

Fatigue is considered as reduced workability and motivation that affects physical, emotional, and mental activeness. It is a critical concern that influences the precision and accurate implementation of some tasks or the emotional condition. Early detection of fatigue onset is crucial, such that preventative or corrective controls may be presented to minimize work-related traumas, the inexact performance of a task that require high-level accuracy, as well as to avoid making a wrong decision as a result of tiredness. Our goal is to create a non-invasive, proactive model for real-time fatigue estimation based on typical features as tremor, heart rate, and blood oxygen saturation. We expect to set up a relation among the handshaking, heart rate, and oxygen level on one side and the weariness onset on the other. We will use a compact high-precision accelerometer to capture the low-frequency physiological tremor and an optical sensor to detect the heart rate and blood oxygen saturation. Intelligent learning algorithm will be used to personalize user characteristics, such as baselines of the tremor, heart rate, and oxygen level. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Machine learning

来源：评论

学校读者我要写书评

暂无评论

Micro-LED backlight module by deep reinforcement learning and micro-macro-hybrid environment control agent

引用

Photonics Research 2022年第2期10卷 269-279页

作者： Che-Hsuan Huang Yu-Tang Cheng Yung-Chi Tsao Xinke Liu Hao-Chung Kuo College of Materials Science and Engineering Guangdong Research Center for Interfacial Engineering of Functional MaterialsInstitute of Microelectronics(IME)Shenzhen UniversityShenzhen 518060China Department of Photonics&Institute of Electro-Optical Engineering College of Electrical and Computer EngineeringTaiwan Yang Ming Chiao Tung University&Taiwan Chiao Tung UniversityHsinchu 30010China Department of Computer Science University of LiverpoolLiverpoolUK Honhai Semiconductor Research Center TaipeiChina

This paper proposes a micro-LED backlight module with a distributed Bragg reflector(DBR) structure to achieve excellent micro-LED backlight module quality and uses deep reinforcement learning(DRL) architecture for optical design. In the DRL architecture, to solve the computing environment problems of the two extreme structures of micro-scale and macro-scale, this paper proposes an environment control agent and virtual-realistic workflow to ensure that the design environment parameters are highly correlated with experimental results. This paper successfully designed a micro-LED backlight module with a DBR structure by the abovementioned *** micro-LED backlight module with a DBR structure improves the uniformity performance by 32% compared with the micro-LED backlight module without DBR, and the design calculation time required by the DRL method is only 17.9% of the traditional optical simulation.

关键词： methods. agent mentioned

来源：评论

学校读者我要写书评

暂无评论

Predicting the Parabolic Growth Rate Constant for High-Temperature Oxidation of Steels Using Machine Learning Models

SSRN

引用

SSRN 2023年

作者： Aghaeian, Soroush Nourouzi, Farshid Sloof, Wim G. Mol, Arjan J.M.C. Böttger, Amarante J. Department of Materials Science and Engineering Faculty of Mechanical Maritime and Materials Delft University of Technology Mekelweg 2 Delft2628 CD Netherlands Department of Electrical Sustainable Energy Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Mekelweg 4 Delft2628 CD Netherlands

Predicting the high-temperature oxidation kinetics of different steel grades is a complex challenge that has not been fully addressed yet. In this work, a data analytics approach is presented to predict the parabolic growth rate constant (kp) of high-temperature oxidation of steels using published data. Experimental data are collected for more than 70 different steel grades exposed to temperatures between 500 and 1200 C in air. © 2023, The Authors. All rights reserved.

关键词： Forecasting

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：