检索结果-内蒙古大学图书馆

Self-assembled Fe_(3)O_(4)nanoparticles on V_(2)C MXene for enhanced supercapacitor and microwave absorption applications

引用

Journal of Advanced Ceramics 2025年第3期14卷 183-196页

作者： Qixun Xia Ranlu Miao Wen Guo Min Xia Libo Wang Qianku Hu Aiguo Zhou School of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo 454003China Henan Province Expressway Efficient Energy Storage Technology and Application Engineering Research Center Zhengzhou 450121China Department of Macromolecular Science Fudan UniversityShanghai 200438China Henan Radio Requlation Information System Backup Center Zhengzhou 450008China

Rapid advancements in modern electronic devices necessitate the development of materials that can simultaneously provide efficient energy storage and effective microwave ***,a novel composite material was prepared via the self-assembly of Fe_(3)O_(4)nanoparticles on the surface of V_(2)C *** composite exhibited characteristics suitable for supercapacitor and electromagnetic absorption applications,highlighting the synergistic relationship between energy storage and electromagnetic wave absorption *** electrochemical tests revealed that the specific capacity of the V_(2)C MXene/Fe_(3)O_(4)composite(42.67 mAh·g^(−1))considerably improved compared with those of the raw *** prepared V2C MXene/Fe_(3)O_(4)//V_(2)C MXene/Fe_(3)O_(4)symmetric supercapacitor(SSC)demonstrated an energy density of 44.8 Wh·L^(−1),a power density of 959.4 W·L^(−1),and a capacity retention of 80.14%after 8000 ***,the V2C MXene/Fe_(3)O_(4)composite exhibited an optimal reflection loss(RL)of−42.4 dB in the Ku band,with an effective absorption bandwidth of 1.9 GHz(14.6–16.5 GHz).This composite material has broad application potential in modern electronic devices owing to its high energy storage capacity and effective electromagnetic wave *** dual functionality improves device performance and offers a compact solution for energy storage and effective microwave absorption.

关键词： MXenes Fe_(3)O_(4) two-dimensional(2D)materials supercapacitors microwave absorption

来源：评论

学校读者我要写书评

暂无评论

Evaluating the Accuracy of kNN Classifier for Gesture Detection Based on Forearm EMG Signal 6

Evaluating the Accuracy of kNN Classifier for Gesture Detect...

引用

6th International Youth Conference on radio Electronics, Electrical and Power engineering, REEPE 2024

作者： Bezrukov, Viacheslav A. Vakhitov, Rodion R. Chuykin, Stepan A. Anuchin, Pavel Y. Kruglov, Anton V. Siziakova, Anna Yu. Fundamentals of Radio Engineering Moscow Power Engineering Institute Moscow Russia Computing Machines Systems and Networks Moscow Power Engineering Institute Moscow Russia Industrial Electronics Moscow Power Engineering Institute Moscow Russia Information Security Moscow Power Engineering Institute Moscow Russia COO Bionika 2.0 Llc Saint-Petersburg Russia Moscow Power Engineering Institute Radio System Department Moscow Russia

ISBN: (纸本)9798350382891

The kNN algorithm is used to solve classification and regression problems. The idea and realization of this algorithm is one of the simplest in machine learning. Despite its simplicity, it solves the problem with a fairly high accuracy. When a person shows a gesture, an EMG signal is generated in the forearm, which can be captured using sensors. Based on these signals and gestures shown by the person, we train the classifier to recognize the gesture and send it to the microcontroller of the prosthesis. In this paper, with less execution time of the whole algorithm, it has been obtained 35% more accuracy than similar systems. © 2024 IEEE.

关键词： Learning algorithms

来源：评论

学校读者我要写书评

暂无评论

A Weak Signal Detection Method Based on Spatial Spectrum-LSTM Neural Network 5

A Weak Signal Detection Method Based on Spatial Spectrum-LST...

引用

5th International Conference on information Communication and Signal Processing, ICICSP 2022

作者： Dong, Yaning Wu, Chuanzhang Zhu, Huizhu Xu, Feng Ren, Xin Electronics Research Institute Communication and Navigation System Department Avic Aeronautical Radio Shanghai China Harbin Engineering University Department of Information and Communication Engineering Harbin China

ISBN: (纸本)9781665485890

In this paper, we propose a weak signal detection method based on spatial spectrum-long short-term memory (LSTM) neural network to address the problem that the traditional blind detection method of weak signals is not effective in the condition of low signal-to-noise ratios. We firstly exploit the difference between the spatial spectrum transformed signal and noise to determine whether there is a weak signal. Then, the LSTM neural network is used for feature learning to classify different samples. It can avoid the influence of the detection threshold on the detection performance of the system. Numerical results show that the detection performance of our method outperforms LSTM neural network, radial basis function neural network, traditional maximum-minimum eigenvalue, and energy detection methods. © 2022 IEEE.

关键词： Long short-term memory

来源：评论

学校读者我要写书评

暂无评论

Parameter Joint Estimation Based on Generalized Cyclic Correlation Spectrum in Alpha-stable Distribution Noise 5

Parameter Joint Estimation Based on Generalized Cyclic Corre...

引用

5th IEEE International Conference on Electronics Technology, ICET 2022

作者： Li, Xinxiang Dou, Zheng Dong, Yaning Wu, Chuanzhang University of Harbin Engineering University School of Information and Communication Engineering Harbin China Avic Communication and Navigation System Department Aeronautical Radio Electronics Research Institute Shanghai China

ISBN: (纸本)9781665485081

Due to the fact that the parameter estimation method of traditional second-order statistics fails under alpha-stable distribution noise, this paper proposes a two-parameter joint estimation algorithm based on an optimized search strategy and the generalized cyclic correlation spectrum (CCS). At the same time, a type of normalized compression function which is similar to 'S' is designed in this paper because of its ability to suppress impulse noise. Firstly, the cursory estimation of the carrier frequency is obtained by the improved frequency domain centering method based on Welch, and two thresholds are set on the frequency axis corresponding to the cursory estimation result. The thresholds are used to divide the search range of spectral peaks in the cyclic spectral section about carrier frequency and symbol rate estimation. And finally, the generalized cyclic discrete spectral line extraction algorithm is used to estimate the accurate parameter in the search range. Simulation results show that the proposed algorithm can suppress the influence of strong impulse noise, and has strong adaptability to the changes in mixed signal-to-noise ratios (MSNR), noise characteristic indexes, and the number of sample points. © 2022 IEEE.

关键词： Impulse noise

来源：评论

学校读者我要写书评

暂无评论

Simulation Model of Data Consistency Protocol for Multicloud systems 3

Simulation Model of Data Consistency Protocol for Multicloud...

引用

3rd IEEE KhPI Week on Advanced Technology, KhPI Week 2022

作者： Kozina, Olha Kozin, Mykyta National Technical University 'Kharkiv Polytechnic Institute' Department of Computer Engineering and Programming Kharkiv Ukraine Kharkiv Nation University of Radio Electronics Department of Information Control System Kharkiv Ukraine

ISBN: (数字)9798350399202

ISBN: (纸本)9798350399202

The development of multi-cloud systems with an acceptable level of service delays that significantly affect the quality of the end-users experience is an open research problem, for which simulation is successfully used. This paper proposes a simulation model in Matlab for estimating the time to write data updates initiated by the end-users to the databases of all cloud service providers for a multi-cloud system with a geo-distributed middleware that implements, as an example, the VIP-grab data consistency protocol. The simulation results indicate that our model can be useful in choosing a data consistency protocol that influences the architecture of a multicloud system. © 2022 IEEE.

关键词： MATLAB

来源：评论

学校读者我要写书评

暂无评论

Evaluation of Stored and Absorbed Power of a Normal-Mode Helical Antenna in a Human Body Condition 10

Evaluation of Stored and Absorbed Power of a Normal-Mode Hel...

引用

10th IEEE Asia-Pacific Conference on Applied Electromagnetics, APACE 2024

作者： Zainudin, Norsiha Seman, Norhudah Yamada, Yoshihide Kamardin, Kamilia Latef, Tarik Abdul Baharin, Rasyidah Hanan Mohd Jizat, Noorlindawaty Md Ansarudin, Farizah Department of Electronic System Engineering Kuala Lumpur Malaysia Universiti Teknologi Malaysia Wireless Communication Centre Faculty of Electrical Engineering Johor Malaysia Universiti Malaya Faculty of Engineering Department of Electrical Engineering Kuala Lumpur Malaysia National Institute of Information and Communications Technology Radio Research Institute Koganei Tokyo Japan FET Multimedia University Faculty of Engineering Selangor Cyberjaya Malaysia Universiti Kebangsaan Malaysia Microwave Technology Research Group Department of Electrical Electronic and Systems Engineering Faculty of Engineering and Built Environment Selangor Bangi Malaysia

ISBN: (纸本)9798350364163

A normal-mode helical antenna (NMHA) is commonly used as a human body sensor for human health care applications. It was reported that the conductivity of a human body significantly affects the antenna's electrical performances. This study analyses the performance of NMHA in the human body condition. The objective is to investigate how the conductivity of human tissue affects the antenna's electrical characteristics such as stored power, absorbed power, and input resistance. Electromagnetic simulations were performed using the FEKO 2019 simulator to assess the electromagnetic field distribution, Poynting vector, and electric power relationships in human body tissues. The time-dependent behavior of stored electric and magnetic powers was examined, revealing that they alternate over time. The results demonstrate that increasing tissue conductivity reduces both stored and absorbed power, as evidenced by a decrease in the Poynting vector magnitude. Moreover, the radiated power distribution area shrinks in higher conductivity environments due to the presence of absorbing materials. © 2024 IEEE.

关键词： Helical antennas

来源：评论

学校读者我要写书评

暂无评论

A Switchable Linear-to-linear Polarization Converter with Broadband Performance

A Switchable Linear-to-linear Polarization Converter with Br...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Zhu, Huizhu Sun, Jiwen Xie, Guangchi Chinese Aeronautical Radio Electronics Research Institute Department of Communication and Navigation System Shang Hai China Nanjing University of Aeronautics and Astronautics College of Electronic and Information Engineering Nanjing China

ISBN: (纸本)9781665452366

A reflective metasurface enabling linear-to-linear polarization conversion or co-polarization reflection is proposed based on the p-i-n diodes. The active design achieved the conversion function in the frequencies range from 3.27 to 7.78 GHz with 82% relative bandwidth when p-i-ns are on and co-polarization reflection over -1 dB from 1.53 to 6.78 GHz when p-i-ns are OFF. © 2022 IEEE.

关键词： Waveform analysis

来源：评论

学校读者我要写书评

暂无评论

The Effect of Crosstalk due to Path Non-linearity on the OFDM Signal Reception Noise Immunity 15

The Effect of Crosstalk due to Path Non-linearity on the OFD...

引用

15th International Scientific-Technical Conference on Actual Problems of Electronic Instrument engineering, APEIE 2021

作者： Falko, Anatoliy I. Shushnov, Maxim S. Shushnova, Tatiana V. Belezekova, Anna S. Siberian State University of Telecommunications and Information Sciences Department of Radio Engineering Devices and Technosphere Safety Novosibirsk Russia Siberian State University of Telecommunications and Information Sciences Department of Digital Radio and Television Broadcasting and Radio Communication System Novosibirsk Russia

ISBN: (纸本)9781665434089

Many modern high-speed wireless data transmission networks, digital television, mobile networks and other often use OFDM multifrequency signals to resist a multipath propagation. However, the use of OFDM, in addition to its advantages, faces a number of problems. Due to the fact that the transmission path, reception path and the physical channel can often have the non-linearity, the OFDM signal at the transmission path output will have crosstalk. This article analyzes the signal reception noise immunity with crosstalk in system with OFDM and non-linear path amplitude characteristic. Crosstalk between OFDM subcarriers can significantly reduce the noise immunity of the transmission system. Dependence of the error probability, taking into account crosstalk noise, on the ratio of the average signal powers to the fluctuation noise is analyzed. It is also shown that limiting the peak values of the OFDM signal in the transmitter allows to obtain an energy gain compared with the linear mode of the transmitter. © 2021 IEEE.

关键词： Orthogonal frequency division multiplexing

来源：评论

学校读者我要写书评

暂无评论

Simulation Mathematical Modeling of Radar Signals with a Low Probability of Their Unauthorized Reception 3

Simulation Mathematical Modeling of Radar Signals with a Low...

引用

3rd IEEE KhPI Week on Advanced Technology, KhPI Week 2022

作者： Galkyn, Sergii Khriapkin, Oleksandr Kaliuzhnyi, Mykola Guo, Qiang National Technical University «kharkiv Polytechnic Institute» Department of Computer Science and Intellectual Property Kharkiv Ukraine Kharkiv National University of Radio Electronics Department of System Engineering Kharkov Ukraine Kharkiv National University of Radio Electronics Problem Research Laboratory Kharkiv Ukraine College of Information and Telecommunication Harbin Engineering University Harbin China

ISBN: (数字)9798350399202

ISBN: (纸本)9798350399202

a technique and software for modeling radar signals with a low probability of their unauthorized reception at the input of the monitoring tool receiver are presented. The technique is illustrated by the formation of a signal model based on the Costas sequence. The methodology and software are designed to develop methods and algorithms: detection, measurement of parameters, recognition of radio emissions of radio electronic equipment, recognition of radio electronic equipment © 2022 IEEE.

关键词： Radar

来源：评论

学校读者我要写书评

暂无评论

Notch filter on differential difference operational amplifier 3

Notch filter on differential difference operational amplifie...

引用

3rf International Scientific Conference on Metrological Support of InnovativeTechnologies, ICMSIT 2022

作者： Yu Denisenko, D. Prokopenko, N.N. Ivanov, Yu I. Butyrlagin, N.V. Information System and Radio Engineering Department Don State Technical University Gagarin Sq. 1 Rostov-on-Don344000 Russia Department of Automatic Control Systems Southern Federal University Bolshaya Sadovaya St. 33 Rostov-on-Don344000 Russia Department of Information System and Radio Engineering Don State Technical University Gagarin Sq. 1 Rostov-on-Don344000 Russia Institute for Design Problems in Microelectronics of Russian Academy of Sciences IPPM RAS Zelenograd124681 Russia

A new notch filter (NF) circuit based on a single differential difference operational amplifier (DDA) has been developed and studied, which is characterized by reduced current consumption in the static mode. Equations are obtained for the transfer functions and parameters of the NF, which includes a low-pass filter and a Sallen-Key high-pass filter, the signals of which are summed by the DDA. Computer modeling of the NF in CAD Micro-Cap was performed. © Published under licence by IOP Publishing Ltd.

关键词： Operational amplifiers

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：