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Strengthening granulation behavior of specularite concentrates based on matching of characteristics of iron ores in sintering process

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Journal of Iron and Steel Research International 2018年第10期25卷 1017-1025页

作者： sheng-li Wu Zhi-gang Que kai-lang Li School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing Beijing 100083 China

Specularite concentrates have advantages of high ferrous grade, less harmful impurities and low price. However, the small size and poor granulation behavior of specularite concentrates consequently deteriorate the permeability of sinter bed and reduce the productivity of sinter, resulting in un-effective utilization in sintering process. The granulation experiments were carried out when specularite concentrates matched with five kinds of fine or coarse ores, and the effects of surface property and wettability of fine or coarse ores on granulation behavior of specularite concentrates were investigated. Then, the optimized ore blending recipes were proposed to strengthen the granulation behavior of specularite concentrates. The results indicated that the growth index increased with increasing the specific surface area of fine ores and had a positive linear correlation with the circularity degree of coarse ores, whereas negative correlations exist between the growth index and the contact angle of fine or coarse ores. Compared with the concentrates, the growth index increased by approximately 22% scheme of blended ores containing 15 mass% specularite in the case of using Ore-A and Ore-E with greater surface property and higher wettability to replace all of Ore-B and half of Ore-D, respectively. Furthermore, the vertical sintering speed and the productivity of sinter improved by approximately 23% and 20%, respectively.

关键词： Iron ore sinter Granulation behavior Specularite concentrate Surface property Wettability

Flexible and Stretchable Electrodes for In Vivo Electrophysiological and Electrochemical Monitoring

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Chinese Journal of Chemistry 2024年第13期42卷 1523-1545页

作者： kai-kai sheng Yi-Fei Lu Wen-Ting Fan Yan-Ling Liu College of Chemistry and Molecular Sciences Wuhan University WuhanHubei 430072China Core Facilty of Wuhan University WuhanHubei 430072China

In vivo monitoring of bioelectrical and biochemical signals with implanted electrodes has received great interest over the past ***,this faces huge challenges because of the severe mechanical mismatch between conventional rigid electrodes and soft biological *** recent years,the emergence of flexible and stretchable electrodes offers seamless and conformable biological-electronic interfaces and has demonstrated significant advantages for in vivo electrochemical and electrophysiological *** review first summarizes the strategies for electrode fabrication from the point of substrate and conductive ***,recent progress in electrode functionalization for improved performance is ***,the advances of flexible and stretchable electrodes in exploring bioelectrical and biochemical signals are ***,we present some challenges and perspectives ranging from electrode fabrication to application.

关键词： Flexible electrodes Conductive materials Stretchable structures Electrode functionalization In vivo monitoring Biochemical signals Bioelectrical signals

A review of carbon dioxide disposal technology in the converter steelmaking process

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International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1421-1429页

作者： Rong Zhu Bao-chen Han kai Dong Guang-sheng Wei School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Research Center of Special Melting and Preparation of High-end Metal Materials University of Science and Technology BeijingBeijing 100083China

In last decade,the utilization of CO?resources in steelmaking has achieved certain metallurgical effects and the technology is *** this review,we summarized the basic reaction theory of CO2,the CO2 conversion,and the change of energy-consumption when CO2 was introduced in converter steelmaking *** the CO2-O2 mixed injection(COMI)process,the CO2 conversion ratio can be obtained as high as 80%or more with a control of the CO2 ratio in mixture gas and the flow rate of CO2,and the energy is saving and even the energy consumption can be reduced by 145.65 MJ/t under certain *** addition,a complete route of CO2 disposal technology is proposed combining the comparatively mature technologies of CO2 capture,CO2 compression,and liquid CO2 storage to improve the technology of CO2 *** results are expected to form a large-scale,highly efficient,and valuable method to dispose of CO2.

关键词： CO2 utilization carbon dioxide steelmaking enhanced stirring temperature control

Upper gastrointestinal microbiota and digestive diseases

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World Journal of Gastroenterology 2013年第10期19卷 1541-1550页

作者： Zi-kai Wang Yun-sheng Yang Department of Gastroenterology and Hepatology the Chinese PLA General Hospitalthe Chinese PLA Medical Academy

Metagenomics which combines the power of genomics,bioinformatics,and systems biology,provide new access to the microbial *** permit the genetic analysis of complex microbial populations without requiring prior *** the conceptual innovations in metagenomics and the improvements in DNA high-throughput sequencing and bioinformatics analysis technology,gastrointestinal microbiology has entered the metagenomics era and become a hot topic *** microbiome research is underway,however,most studies in this area have focused on the composition and function of the intestinal microbiota and the relationship between intestinal microbiota and metabolic diseases(obesity,diabetes,metabolic syndrome,etc.) and intestinal disorders [inflammatory bowel disease,colorectal cancer,irritable bowel syndrome(IBS),etc.].Few investigations on microbiota have been conducted within the upper gastrointestinal tract(esophagus,stomach and duodenum).The upper gastrointestinal microbiota is essential for several gastrointestinal illnesses,including esophagitis,Barrett's esophagus,and esophageal carcinoma,gastritis and gastric cancer,small intestinal bacterial overgrowth,IBS and celiac ***,the constitution and diversity of the microbiota in different sections of the upper gastrointestinal tract under health and various disease states,as well as the function of microbiota in the pathogenesis of various digestive diseases are still *** current article provides an overview of the recent findings regarding the relationship between upper gastrointestinal microbiota and gastrointestinal diseases;and discusses the study limitations and future directions of upper gastrointestinal microbiota research.

关键词： Microbiota Upper gastrointestinal tract Digestive diseases 16S rDNA Metagenomics

EXPERIMENTAL STUDY ON SOIL MOISTURE USING DUAL-FREQUENCY MICROWAVE RADIOMETER

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Chinese Geographical Science 2006年第1期16卷 83-86页

作者： GUAN Zhi ZHAO kai SONG Dong-sheng Nartheast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 P.R.China Graduate School of Chinese Academy of Sciences Beijing 100049 P.R.China

An experiment of measuring soil moisture was carried out by using dual-frequency microwave radiometer designed by the authors. The measured data were analyzed by using statistical regression method and the empirical regression model of retrieving soil moisture in L-band and C-band was developed. The soil moisture in a rainfall event was retrieved using the experiential regression model, which is consistent well with the field sampling value. The results show that when soil moisture is lower than 75%, the brightness temperature is linear with soil moisture. However, when soil moisture is higher than 75%, the brightness temperature is not linear with soil moisture, so it is difficult for microwave radiometer to measure the changes of soil moisture. The experiment verifies the effectiveness and feasibility of microwave remote sensing soil moisture. Although this method for linear regression based on the data measured with the radiometer is simple, and has strong adaptability, generally it has only local application value, and lacks universal applicability for different areas and different conditions.

关键词： soil moisture dual-frequency microwave radiometer brightness temperature

CBSC: A Crowdsensing System for Automatic Calibrating of Barometers

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Journal of Computer Science & Technology 2019年第5期34卷 1007-1019页

作者： Hai-Bo Ye Xuan-Song Li Li sheng kai Dong College of Computer Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China School of Computer Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China School of Computer Science and Engineering Southeast UniversityNanjing 211189China

The mobile crowdsensing software systems can complete large-scale and complex sensing tasks with the help of the collective intelligence from large numbers of ordinary users. In this paper, we build a typical crowdsensing system, which can efficiently calibrate large numbers of smartphone barometer sensors. The barometer sensor now becomes a very common sensor on smartphones. It is very useful in many applications, such as positioning, environment sensing and activity detection. Unfortunately, most smartphone barometers today are not accurate enough, and it is rather challenging to efficiently calibrate a large number of smartphone barometers. Here, we try to achieve this goal by designing a crowdsensingbased smartphone calibration system, which is called CBSC. It makes use of low-power barometers on smartphones and needs few reference points and little human assistant. We propose a hidden Markov model for peer-to-peer calibration, and calibrate all the barometers by solving a minimum dominating set problem. The field studies show that CBSC can get an accuracy of within 0.1 hPa in 84% cases. Compared with the traditional solutions, CBSC is more practical and the accuracy is satisfying. The experience gained when building this system can also help the development of other crowdsensing-based systems.

关键词： crowdsensing system smartphone sensing barometer calibration

Atomic-Scale Insights into Damage Mechanisms of GGr15 Bearing Steel Under Cyclic Shear Fatigue

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1265-1278页

作者： Qiao-sheng Xia Dong-Peng Hua Qing Zhou Ye-Ran Shi Xiang-Tao deng kai-Ju Lu Hai-Feng Wang Xiu-Bing Liang Zhao-Dong Wang State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an710072China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China Defense Innovation Institute Academy of Military ScienceBeijing100071China

Alternating shear stress is a critical factor in the accumulation of damage during rolling contact fatigue,severely limiting the service life of ***,the specific mechanisms responsible for the cyclic shear fatigue damage in bearing steel have not been fully *** the mechanical response and microstructural evolution of a model GGr15 bearing steel under cyclic shear loading are investigated through the implementation of molecular dynamics *** samples undergo 30 cycles under three different loading conditions with strains of 6.2%,9.2%,and 12.2%,*** findings indicate that severe cyclic shear deformation results in early cyclic softening and significant accumulation of plastic damage in the bearing ***,samples subjected to higher strain-controlled loading exhibit higher plastic strain energy and shorter fatigue ***,strain localization is identified as the predominant damage mechanism in cyclic shear fatigue of the bearing steel,which accumulates and ultimately results in fatigue ***,simulation results also revealed the microstructural reasons for the strain localization(e.g.,BCC phase transformation into FCC and HCP phase),which well explained the formation of white etching *** study provides fresh atomic-scale insights into the mechanisms of cyclic shear fatigue damage in bearing steels.

关键词： Cyclic shear fatigue Molecular dynamic simulation Bearing steels Plastic damage accumulation

Multi-bubble motion behavior of uniform magnetic field based on phase field model

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Chinese Physics B 2020年第3期29卷 303-311页

作者： Chang-sheng Zhu Zhen Hu kai-Ming Wang School of Computer and Communication Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Gansu Advanced Processing and Recycling of Non-Ferrous Metal Lanzhou University of TechnologyLanzhou 730050China

Aiming at the interaction and coalescence of bubbles in gas–liquid two-phase flow, a multi-field coupling model was established to simulate deformation and dynamics of multi-bubble in gas–liquid two-phase flow by coupling magnetic field, phase field, continuity equation, and momentum equation. Using the phase field method to capture the interface of two phases, the geometric deformation and dynamics of a pair of coaxial vertical rising bubbles under the applied uniform magnetic field in the vertical direction were investigated. The correctness of results is verified by mass conservation method and the comparison of the existing results. The results show that the applied uniform magnetic field can effectively shorten the distance between the leading bubble and the trailing bubble, the time of bubbles coalescence, and increase the velocity of bubbles coalescence. Within a certain range, as the intensity of the applied uniform magnetic field increases, the velocity of bubbles coalescence is proportional to the intensity of the magnetic field, and the time of bubbles coalescence is inversely proportional to the intensity of the magnetic field.

关键词： bubbles coalescence uniform magnetic field numerical simulation phase field method

The First Loess-Based Paleoclimatic Reconstruction over the Last Interglacial-Glacial Cycle in the Hunshandake Sandy Land

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Acta Geologica Sinica(English Edition) 2018年第3期92卷 1285-1287页

作者： JIANG kai WANG Xisheng sheng Mei MLR Key Laboratory of Paleomagnetism and Paleotectonic Reconstruction Institute of GeomechanicsChinese Academy of Geological Sciences

Objective Although extensive lakes and eolian sands within and surrounding the Hunshandake Sandy Land(HSL)are sensitive to paleoenvironmental variations in arid and semi-arid eastern Inner Mongolia(e.g.,Yang et al.,20... 详细信息

关键词： The First Loess-Based Paleoclimatic Reconstruction the Last Interglacial-Glacial Cycle