检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Han, Dan Chen, Yi Li, Donghui Dong, Hailiang Xu, Bingshe Sang, Shengbo He, Xiuli Shanxi Key Laboratory of Micro Nano Sensors & Artificial Intelligence Perception College of Information and Computer Taiyuan University of Technology Taiyuan030024 China Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan030024 China Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Ministry of Education Taiyuan030024 China State Key Laboratory of Transducer Technology Aerospace Information Research Institute Chinese Academy of Sciences Beijing100190 China Shanxi Research Institute of 6D Artificiat Intelligence Biomedical Science Taiyuan030024 China

Gallium nitride (GaN) has some challenges for gas sensing, such as high detection lower limit (LOD) or controlling the epitaxy of nanostructures. To address these issues, we exclusively designed a device to enhance the gas interaction capabilities of GaN quantum dots (QDs) film fabricated by metal-organic chemical vapor deposition (MOCVD). The GaN QDs film gas sensor exhibited a low LOD (5 ppb) to NO2 at room temperature (RT), which has much superior gas performance than other GaN-based sensors. The results manifest that many ultra-small QDs around 2 nm in diameter are stacked to form QDs of larger size, and confirm the existence of vacancies. The sensor displays a ultra-high electron mobility of 1237.37 cm2 V−1s−1, demonstrate that great shallow donor impurities in GaN QDs film that ionize easily at RT, which is greatly beneficial for gas sensing. The sensing mechanisms were analyzed based on its abundant active sites, ultrahigh carrier mobility, high surface energy and chemical activity, grain boundary barrier and good electrical conductivity. Moreover, the sensor processes high selectivity, repeatability, stability and reusability based on MOCVD technology which can realize precise control of structure, morphology and surface energy level, which is expected to achieve rapid industrialization. © 2022, The Authors. All rights reserved.

关键词： Gallium nitride

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Low-carbon Economic Dispatch of Integrated Energy system Considering Hydrogen Mixing in Natural Gas Pipeline

Low-carbon Economic Dispatch of Integrated Energy System Con...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Dong Xie Lihong Kang Yanbinz Jia Hao Chen Feng Tian Yun Bai Baifu Zhang Xuan Cui State Grid Shaoxing Power Supply Company Shaoxing China Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China State Grid Shanxi Electric Power Company Taiyuan Power Supply Company Taiyuan China

ISBN: (纸本)9781665434263

With the rapid growth of the penetration rate of renewable energy, the construction of Integrated electricity-natural gas system (IEGS) has important economic and environmental significance. Power-to-gas (P2G) technology, as a new energy conversion and storage method, provides an important way for wind power consumption. Due to the limited local consumption of hydrogen energy and difficulty in exporting, this paper proposes an IEGS optimal scheduling model that considers hydrogen mixing in natural gas pipeline and aims at the lowest system operating cost. After the verification of the improved IEEE 14-node power network and the Belgian 20-node natural gas network coupling system, the operation mode of the IEGS proposed in this paper can expand the hydrogen demand, increase the hydrogen transmission capacity, and promote wind power consumption. At the same time, it can achieve carbon emission reduction and improve the economics of system operation.

关键词： Renewable energy sources systems operation Hydrogen Pipelines Energy conversion Carbon dioxide system integration

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Optimization on Weighting Factors of Model Predictive Control Based on Fuzzy Technique for Linear Induction Machine

Optimization on Weighting Factors of Model Predictive Contro...

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2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020

作者： Tang, Lei Wang, Xiaoguang Xu, Wei School of Electrical Engineering Southwest Jiaotong University Chengdu611756 China Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781728152158

Compared with direct thrust control and vector control methods, the model predictive control (MPC) is recognized as a more effective approach. However, the weighting factors in the objective function must be tuned, which greatly increases the computation burden. In this work, based on the fuzzy technique, one weighting factor optimization method is proposed to identify the suitable control action for the linear induction machine (LIM), which can effectively simplify the selection process. At last, comprehensive simulation results have demonstrated the excellent performance of the proposed method. © 2020 IEEE.

关键词： Model predictive control

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The Minority Matters: A Diversity-Promoting Collab.rative Metric Learning Algorithm

arXiv

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arXiv 2022年

作者： Bao, Shilong Xu, Qianqian Yang, Zhiyong He, Yuan Cao, Xiaochun Huang, Qingming State Key Laboratory of Information Security Institute of Information Engineering CAS China School of Cyber Security University of Chinese Academy of Sciences China Key Lab. of Intelligent Information Processing Institute of Computing Technology CAS China School of Computer Science and Tech. University of Chinese Academy of Sciences China Alibaba Group China School of Cyber Science and Technology Shenzhen Campus Sun Yat-sen University China Key Laboratory of Big Data Mining and Knowledge Management CAS China Peng Cheng Laboratory China

Collab.rative Metric Learning (CML) has recently emerged as a popular method in recommendation systems (RS), closing the gap between metric learning and Collab.rative Filtering. Following the convention of RS, existing methods exploit unique user representation in their model design. This paper focuses on a challenging scenario where a user has multiple categories of interests. Under this setting, we argue that the unique user representation might induce preference bias, especially when the item category distribution is imbalanced. To address this issue, we propose a novel method called Diversity-Promoting Collab.rative Metric Learning (DPCML), with the hope of considering the commonly ignored minority interest of the user. The key idea behind DPCML is to include a multiple set of representations for each user in the system. Based on this embedding paradigm, user preference toward an item is aggregated from different embeddings by taking the minimum item-user distance among the user embedding set. Furthermore, we observe that the diversity of the embeddings for the same user also plays an essential role in the model. To this end, we propose a diversity control regularization term to accommodate the multi-vector representation strategy better. Theoretically, we show that DPCML could generalize well to unseen test data by tackling the challenge of the annoying operation that comes from the minimum value. Experiments over a range of benchmark datasets speak to the efficacy of DPCML. © 2022, CC BY-NC-SA.

关键词： Embeddings

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PolSAR Ship Detection with Polarimetric Correlation Pattern 6

PolSAR Ship Detection with Polarimetric Correlation Pattern

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6th Asia-Pacific Conference on Synthetic Aperture Radar, APSAR 2019

作者： Cui, Xing-Chao Tao, Chen-Song Chen, Si-Wei Su, Yi State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense Technology Changsha China

ISBN: (纸本)9781728129129

Polarimetric correlation pattern has been proposed and utilized for polarimetric SAR (PolSAR) ship detection in this paper. The core idea of polarimetric correlation pattern is to extend the polarimetric correlation of two arbitrary polarization channels at a fixed rotation angle to the rotation domain. Based on the target-to-clutter ratio (TCR) analysis, four features derived from the polarimetric correlation pattern with high TCR are selected. PolSAR ship detection schemes are proposed thereafter, which mainly contain three steps: features selection with high TCR, thresholding procedure, and morphological filtering. Experimental studies with Radarsat-2 data validate the advantages of the proposed detection schemes. © 2019 IEEE.

关键词： Ships

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Recognition of military and civilian ships in sar images based on ellipse fitting similarity 2

Recognition of military and civilian ships in sar images bas...

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2nd IEEE International Conference on Electronics technology, ICET 2019

作者： Yang, Shu Hu, Yang Xiong, Boli Kuang, Gangyao State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense Technology Changsha China

ISBN: (纸本)9781728116181

With the development of SAR imaging technology, detailed information of ship targets is displayed in high resolution SAR, which facilitates target recognition. In this paper, the differences between the structures of military and civilian ships are investigated. The paper utilizes the characteristics of military ships that have structures like towering bridges, which make them have a protruding structure in SAR images compared with civilian ships. As a result, the similarity between the ship contour and the fitting ellipse is used to recognition the military and civilian ships. Hence, a method for recognizing military and civilian ships in high-resolution SAR images based on ellipse fitting is proposed. This method can be divided into two steps, first extracting the edge of the ship target in the image, and then judging the similarity between the edge and the ellipse. The high-resolution images obtained by GF-3 satellite are used for experimental verification. The experimental results show that this method can effectively classify military and civilian ships. © 2019 IEEE.

关键词： Synthetic aperture radar

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Doppler rate-of-change estimation method for bpsk signal based on spectrum phase

Doppler rate-of-change estimation method for bpsk signal bas...

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2019 International Conference on Electronic Engineering and Informatics, EEI 2019

作者： Xia, Deqian Zhang, Min Guo, Fucheng Feng, Daowang State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense Technology Changsha China

ISBN: (纸本)9781728140766

When there is relative motion between the receiver and the emitting source, the emitter position can be determined by a single receiver with a single channel using Doppler rate-of-change received. In this passive localization application, accurate Doppler rate-of-change information is the key precondition to guarantee high localization precision. A new Doppler rate-of-change estimation method for BPSK signal based on spectrum phase is proposed in this paper using the special structure of the continuous signal by BPSK (Binary Phase Shift keying) modulation. In the proposed method, the phase jump can be eliminated by the squaring operation to the received signal, and the signal is segmented to multiple shorter pieces of the same length. The central frequency is estimated from each signal piece by fast Fourier transformation. The spectrum phase can be obtained by doing Fourier transform at the central frequency of each signal piece. The Doppler rate-of-change was estimated using the linear minimum mean square criterion. The effectiveness of the proposed method was proved by the computer simulation. © 2019 IEEE.

关键词： Binary phase shift keying

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Research on the corrosive effect of inactive sulfur on oil-paper insulation 7

Research on the corrosive effect of inactive sulfur on oil-p...

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7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Gao, Sihang Li, Jiajun Ke, Tingjing Liu, Yang Ding, Dong Key Laboratory of Industrial Internet of Things and Networked Control Ministry of Education Chongqing University of Posts and Telecommunications Chongqing China State Grid Chongqing Electric Power Company Chongqing Chongqing China Baoding Electric Power Corporation Baoding China State Key Lab. of Transmission Distribution Equipment and Power System Safety and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781728155111

Sulfur corrosion induced by active sulfur has been proved to significantly decrease the insulation performance of oil-immersed equipment. In order to protect the oil-paper insulation from sulfur corrosion, active sulfur is cleared in the refining process of crude oil. Some inactive sulfur with high-efficiency antioxidant is still retained in the mineral oil to improve the oxidation stability of oil, such as thiophenic compounds. However, the corrosive effect of inactive sulfur on the oil-paper insulation has not yet clear. Therefore, thiophene that is the largest content of sulfide in the insulating oil was selected as the research object, a series of accelerated thermal ageing experiments of oil-paper without and with thiophene under the different high temperature were conducted, scanning electron microscope equipped with an energy-dispersive X-ray spectrometer (SEM/EDX) and inductively coupled plasma atomic emission spectrometry (ICP-AES) were used to characterize the corrosion degree of oil-paper insulation. The results show that no corrosive deposit was observed on the surface of oilpaper insulation without thiophene even at very high temperature, while a few corrosive deposit was accumulated on the surface of oil-paper insulation with 500 mg/kg thiophene. The corrosion degree of oil-paper insulation with thiophene had an uptrend as the increase of temperature (130°C-180°C), preliminarily indicating that thiophene may be activated in the oil-paper system under the action of overheating fault of oil-immersed transformer and posed a corrosion threat to oil-paper insulation. © 2020 IEEE.

关键词： Scanning electron microscopy

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An Advanced Control Strategy for Bidirectional Isolated Three Phase AC/DC Dual-Active-Bridge Converter in Hybrid Microgrid

An Advanced Control Strategy for Bidirectional Isolated Thre...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Dongxin Guo Panbao Wang Jiansheng Kong Jinjie Tian Chunguang Ren Xiangqi Meng Yanbing Jia Yue Qin Zeqi Wang Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China Harbin Institute of Technology Harbin China Datong Power Supply Company State Grid Shanxi Electric Power Company Datong China School of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434263

This paper proposes an advanced control strategy consisting of current stress optimization based on triple-phase-shifting (TPS) modulation for front-end DAB converter and 33% PWM method for back-end three-phase full bridge inverter. Compared with the traditional phase shift control, the control strategy proposed for the front-end DAB converter achieves linear control and significantly reduces current stress. In addition, it reduces the DC-Link capacitance, which improves the safety of the equipment. The 33% modulation method adopted by the full bridge inverter at the back-end reduces the switching loss of semiconductor devices. The principle, derivation and realization of the proposed control strategy are described in detail. Simulation results are presented to validate the effectiveness of the proposed strategy.

关键词： Solid modeling Phase modulation Switching frequency Bridge circuits Switching loss system integration Capacitance

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ANSYS Simulation Model of Buried Metal Pipeline Corrosion Detection 2

ANSYS Simulation Model of Buried Metal Pipeline Corrosion De...

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2nd International Conference on Environmental Prevention and Pollution Control Technologies, EPPCT 2020

作者： Zhang, Chunmei Liu, Longhuan Liao, Xian Hu, Xuquan Fu, Zhihong Li, Bo State Key Lab. of Transmission and Distribution Equipment and System Safety and New Technologies Chongqing University Chongqing400000 China Chongqing Triloop Prospecting Technology Co. Ltd. Chongqing400000 China Yunnan Electric Power Research Institute Kunming Yunnan650000 China

Corrosion testing of buried metal pipelines is an important measure to ensure the safe operation of pipelines. In order to investigate the transient electromagnetic field named response of buried metal pipelines, a three-dimensional simulation model was established by using multiphysics simulation software named ANSYS Multiphysics to calculate and analyze buried metal pipelines with different corrosion degrees, ie different wall thicknesses, on the receiving coil after the excitation signal is turned off[1]. The induced electromotive force changes, the results show that the larger the wall thickness, that is, the smaller the corrosion degree, the slower the attenuation of the induced electromotive force curve of the receiving coil, the smaller the wall thickness, the faster the attenuation;and the verification was experimented: the transient electromagnetic method can effectively detect the degree of corrosion of metal pipes buried under the ground. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Pipeline corrosion

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