检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Li, Ziyu Qin, Ciyu Liu, Ruoshui Li, Jinling Sun, Yang Gong, Huayang Xu, Zhiyi Jing, Xiaodong School of Rare Earths University of Science and Technology of China Anhui Hefei230026 China Ganjiang Innovation Academy Chinese Academy of Sciences Jiangxi Ganzhou341119 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Multiphase Complex Systems Beijing Engineering Research Centre of Process Pollution Control Institute of Process Engineering Chinese Academy of Sciences No.1 2nd North Street ZhongGuanCun Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China

The changes in the physical phase, microscopic morphology and magnetic properties of the magnetic powders obtained at different calcination temperatures with different Fe and Ca contents were investigated. Strontium ferrite Sr0.55-yLa0.45CayCo0.3FexO19 (y=0, 0.05, 0.1, 0.15;x=9.4, 9.9, 10.4, 10.9) was prepared by the solid-phase reaction method, and the calcination temperatures ranged from 1175°C to 1250°C during the experiments. It was found that when the calcination temperature was decreased, the magnetic powder particles became smaller, but the Fe2O3 heterogeneous phase appeared in the magnetic powder. And reducing the Fe content can eliminate the Fe2O3 heterogeneous phase, but it will lead to the increase of grain size. Adjusting the Ca content can ensure the constant Co content into the lattice, but it will also increase the grain size. Finally, by magnetic analysis, the calcination temperature was decreased from 1250°C to 1225°C, and the coercivity of the magnetic powder was increased by about 1000 Oe, and the saturation magnetization intensity did not change significantly. Therefore, it is inferred that the effect of decreasing the calcination temperature on improving the coercivity is greater than that of decreasing the iron content and increasing the calcium content on decreasing the coercivity. The coercivity Hc can be increased without changing the saturation magnetization strength Ms. Ultimately, the magnetic properties of La-Ca-Co substituted M-type strontium ferrite can be further improved by this method. © 2022, The Authors. All rights reserved.

关键词： Solid state reactions

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Water Quality Index Models for Lotic and Lentic Ecosystems-A Systematic Review

Research Square

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Research Square 2023年

作者： Mogane, Lazarus Katlego Masebe, Tracy Msagati, Titus A.M. Ncube, Esper College of Agriculture & Environmental Sciences Department of Life and Consumer Sciences University of South Africa Gauteng Roodepoort South Africa College of Science Engineering & Technology Institute for Nanotechnology and Water Sustainability University of South Africa Gauteng Roodepoort South Africa Rand Water Scientific Services Process Technology Division Gauteng Vereeniging South Africa School of Health Systems and Public Health Faculty of Health Sciences University of Pretoria Gauteng Tshwane South Africa

This review article intends to survey the information on water quality indices developed for the general evaluation of surface water and establish whether the water quality indices (WQIs) can be used to evaluate both lentic and lotic ecosystems simultaneously. Water quality index (WQI) models have gradually gained popularity since their maiden introduction in the 1960s. WQIs transform complex water quality data into a single dimensionless number to enable accessible communication of the water quality status of water resource ecosystems. To screen relevant articles, the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) method was employed to include or exclude articles. A total of 17 peer-reviewed articles were used in the final paper synthesis. Among the reviewed WQIs, only the Canadian Council for Ministers of the Environment (CCME) index, Waski & Parker index, and Hahn index are used to assess both lotic and lentic ecosystems. Furthermore, the CCME index is the only exception from rigidity because it does not specify parameters to select. Except for the West-Java WQI, none of the reviewed WQI performed sensitivity and uncertainty analysis to improve the acceptability and reliability of the WQI. It has been revealed that despite the use of statistical methods such as cluster analysis (CA), factor analysis (FA), and analytic hierarchy process (AHP), WQI models continue to suffer from either eclipsing, ambiguity, or uncertainty limitations because natural ecosystems tend to be too complex for these statistical methods. This review thus recommends coupling statistical methods with machine learning techniques such as artificial neural networks (ANN) in the WQI model development processes. © 2023, CC BY.

关键词： Ecosystems

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Effect of Ca2+ on the Microstructure, Morphology and Magnetic Properties of La-Co Substituted M-Type Strontium Ferrite at Low Fe Content

SSRN

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SSRN 2022年

作者： Li, Ziyu Sun, Yang Qin, Ciyu Liu, Ruoshui Li, Jinling Gong, Huayang Xu, Zhiyi Jing, Xiaodong School of Rare Earths University of Science and Technology of China Anhui Hefei230026 China Ganjiang Innovation Academy Chinese Academy of Sciences Jiangxi Ganzhou341119 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Multiphase Complex Systems Beijing Engineering Research Centre of Process Pollution Control Institute of Process Engineering Chinese Academy of Sciences No.1 2nd North Street ZhongGuanCun Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China

We report on the synthesis of Sr0.55-xLa0.45CaxCo0.3Fe10.9O19 by the ceramic method. Powder X-ray diffraction data of the samples show that the heterogeneous peaks in the spinel phase containing Co with Ca2+ substitution (0≤x≤0.10) gradually diminish. The lattice constants c decrease as the Ca2+ content increases. In addition, the lengths of Fe-O bonds at positions such as 2a, 2b and 4f2 in the crystal were shortened. Raman spectroscopy verified the occupancy of Co2+ in the presence of Ca2+. Magnetization measurements showed that Ms reached a maximum value of 77.85 emu/g when the Ca2+ content x=0.10. HA decreased from 32.20 kOe (x=0) to 27.60 kOe (x=0.20) and K1 obtained a maximum value of 6.50☓106 erg/cm3 at x=0.05. The results of the research on these samples are useful for low Fe content ions in place of M-type strontium ferrite is of great significance. © 2022, The Authors. All rights reserved.

关键词： Magnetic properties

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A Novel E-Nose Chamber Design for VOCs Detection in Automobiles

A Novel E-Nose Chamber Design for VOCs Detection in Automobi...

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第三十九届中国控制会议

作者： Lu Cheng Yin-Bo Liu Qing-Hao Meng Institute of Robotics and Autonomous Systems Tianjin Key Laboratory of Process Measurement and ControlSchool of Electrical and Information EngineeringTianjin University

To detect parts per billion（ppb）-level volatile organic compounds（VOCs） in automobiles, a pre-concentrator is generally needed for electronic noses（e-noses）, which can enrich ppb-level concentration to parts per million（ppm） level. However, the current e-nose chamber structure could dilute the pre-concentrated gases and then the detection performance is reduced. To solve this problem, a novel chamber design was proposed in this paper. The core design idea was to reduce the space for the gas flow in the chamber, taking into account the shape and size of the gas sensors. Specially, for the pin-type gas sensors, a series of cylindrical structure design was adopted, and for the micro-electro-mechanical system（MEMS） patch-type sensors, the headspace was compressed. The results of computational fluid dynamics（CFD） based simulation showed that the concentration of pre-concentrated gases in the novel chamber was higher than that of the traditional chamber. The designed chambers were manufactured using polylactic acid（PLA） material by 3D printing. Experimental gases were prepared from polyurethane（PU） leather and polyvinyl chloride（PVC） leather to verify the performance of the chambers, and the results demonstrated that the proposed new e-nose chamber was superior to the traditional one in terms of the pre-concentration effect, repeatability and classification performance.

关键词： e-nose chamber pre-concentrator parts per billion（ppb） volatile organic compounds（VOCs） repeatability classification

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Attitude Adjustment of a Multi-joint AUV Using an Improved LADRC

Attitude Adjustment of a Multi-joint AUV Using an Improved L...

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第三十九届中国控制会议

作者： Lin Yu Ke-Xian Liu Qing-Hao Meng Institute of Robotics and Autonomous Systems Tianjin Key Laboratory of Process Measurement and ControlSchool of Electrical and Information Engineering Tianjin University

To achieve vertical profile exploration of deep-sea hybrid structures, a multi-joint autonomous underwater vehicle(MJ-AUV) with the orthogonal joints structure was designed, and its virtual prototype was built using Automatic Dynamic Analysis of Mechanical systems(ADAMS). This paper focuses on the attitude control of the designed MJ-AUV which is a nonlinear system with strong coupling, big hysteresis, large inertia, and time-varying disturbance. According to the special structure of the MJ-AUV, an error based variable gain linear active disturbance rejection controller(EVG-LADRC) was proposed and compared with the traditional proportional-integral-derivative(PID) controller and LADRC. Simulation results demonstrated that EVG-LADRC outperformed the PID and LADRC in terms of rapidity, anti-interference, and accuracy.

关键词： MJ-AUV virtual prototype attitude control EVG-LADRC

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Monocular Visual SLAM based on VGG Feature Point Extraction

Monocular Visual SLAM based on VGG Feature Point Extraction

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第三十九届中国控制会议

作者： Xu-Yang Dai Qing-Hao Meng Wen-Jian Zheng Shao-Kai Zhu Institute of Robotics and Autonomous Systems Tianjin Key Laboratory of Process Measurement and ControlSchool of Electrical and Information Engineering Tianjin University

Significant progress has been made in the field of visual SLAM（Simultaneous Localization and Mapping）. However, the localization accuracy of visual SLAM can be significantly reduced in low-texture and illumination-changing environments. To solve these problems, an enhanced visual SLAM algorithm based on VGG（Visual Geometry Group） network was proposed in this paper. Firstly, the VGG network for feature point extraction was incorporated into the visual odometry（VO） to achieve robust camera pose estimation. Secondly, an automatic corner annotation method was adopted to set up the training database, which could reduce the workload of data annotation. Thirdly, to make the backend optimization more suitable for the VGG based VO, the BA（bundle adjustment） optimization process was improved. Experimental results showed that, the proposed visual SLAM method outperformed the mainstream ORB-SLAM（Oriented FAST and Rotated BRIEF SLAM） method, in terms of the number of effective feature points, the robustness of feature matching process to light changes, and the accuracy of robot pose estimation.

关键词： monocular visual SLAM feature point extraction convolutional neural network

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Indoor Layout Estimation by Fusing Monocular RGB Image Features Extracted with HRNet

Indoor Layout Estimation by Fusing Monocular RGB Image Featu...

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第三十九届中国控制会议

作者： Rong-Ze Huang Yin-Bo Liu Meh Jabeen Qing-Hao Meng Institute of Robotics and Autonomous Systems Tianjin Key Laboratory of Process Measurement and ControlSchool of Electrical and Information EngineeringTianjin University

Indoor layout estimation(ILE) is a challenging research that segments the natural indoor scene image into floor,walls and ceiling,and it has a wide range of application prospects in the fields such as scene understanding,reconstruction,robot positioning,and virtual *** ILE method by merging multiple feature s from a monocular red-green-blue(RGB) image was ***,the High-resolution networks(HRNet) was used to extract the features of indoor corner keypoints(CKs) and informative edges(IEs) in the form of ***,the extracted features were then selected through a room type(RT)classification ***,a feature fusion algorithm was proposed,which obtained the initial layout hypothe sis through CK features and then continuously optimized the layout hypothe sis with IE *** proposed ILE method was validated on the large scene understanding challenge(LSUN) dataset.

关键词： Indoor layout estimation Corner keypoint Informative edge Fusion algorithm High-resolution net

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The Level of Digital and Communication Competencies of Students at Faculties of Civil engineering in the Distance Learning Form 18

The Level of Digital and Communication Competencies of Stude...

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18th IEEE International Conference on Emerging eLearning Technologies and Applications, ICETA 2020

作者： Mesaros, P. Kanalikova, A. Behunova, A. Mandicak, T. Spisakova, M. Faculty of Civil Engineering Department of Economics Management and Information Systems in Construction Kosice Slovakia Faculty of Civil Engineering Department of Applied Mathematics and Descriptive Geometry Kosice Slovakia Faculty of Mining Ecology Process Control and Geotechnologies Institute of Earth Resources Kosice Slovakia Faculty of Civil Engineering Department of Technologies and Innovations in Construction Kosice Slovakia

ISBN: (纸本)9780738123660

For education, 2020 became the year of distance learning and online communication in the teacher-student relationship, but also in the student-student relationship. This teaching system brings many challenges for both parties and the need to improve the communication and digital competencies of all involved. It also requires increased demands on the hardware and software provision of teaching on both sides of the teaching process. This article focuses on the issue and description of communication and digital skills needed for distance learning. The main goal of the research is to compare and map the communication and digital ICT competencies of faculty students with a construction focus during full-time and distance learning. The results of the research are analyzed in the article using methods of descriptive as well as analytical statistics. © 2020 IEEE.

关键词： Students

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A survey on the status of industrial flotation control

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IFAC-PapersOnLine 2020年第2期53卷 11854-11859页

作者： J.D. le Roux D.J. Oosthuizen S. Mantsho I.K. Craig Department of Electrical Electronic and Computer Engineering University of Pretoria Pretoria South Africa Process IQ Perth Australia Measurement and Control Division Mintek Randburg South Africa

A survey was conducted to establish the status-quo of industrial flotation control. The survey focussed on the measurements and actuators generally available in industry, the reliability and accuracy of measurements, and how important process variables are controlled. It is evident from the survey that regulatory control is well established with reliable and relatively accurate measurements available throughout a plant. The introduction of froth image analysers seems to gain good traction and enables improved control of mass pull to achieve consistent concentrate grade. Although supervisory control may soon be the new standard for flotation plants, on-line grade optimisation requires further work.

关键词： flotation mineral processing optimisation process control survey

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From stirring to mixing: artificial intelligence in the process industry

From stirring to mixing: artificial intelligence in the proc...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Valentin Khaydarov Sebastian Heinze Markus Graube Andreas Knüpfer Maximilian Knespel Silke Merkelbach Leon Urbas Process-To-Order Lab Technische Universität Dresden Dresden Germany Chair Process Control Systems/Process System Engineering Technische Universität Dresden Dresden Germany Center for Information Services and HPC (ZIH) Technische Universität Dresden Dresden Germany

ISBN: (数字)9781728189567

ISBN: (纸本)9781728189574

The introduction of AI methods in production or production-related environments meets with resistance from operators due to their lack of relevant experience and their responsibility for plant safety. To overcome these inhibitions one requires prototypical implementations, which offer considerable benefits, meet the highest requirements for reliability, are accepted by the operating personnel, and get support from those in charge. As a result, AI technologies must be embedded into the complex IT/OT infrastructure of the companies. Traceability, maintainability and longevity must also be guaranteed. As a first step towards this, we present a concept of the demonstrator and its first results, which should make AI comprehensible by visualizing challenges and exploring possibilities in the process industry.

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