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New advances in coal structure model 被引量:11
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作者 Qin Zhihong 《International Journal of Mining Science and Technology》 EI CSCD 2018年第4期541-559,共19页
Although human beings have come to understand and utilize coal for a very long history, no theoretical breakthrough in the study of coal structure has been made, which still needs continuous efforts of coal chemical w... Although human beings have come to understand and utilize coal for a very long history, no theoretical breakthrough in the study of coal structure has been made, which still needs continuous efforts of coal chemical workers. Based on the viewpoint of ‘vague/clear', the species classification and accurate analysis on coal were conducted by using the natural clustering all-component separation method. A more systematic and detailed coal embedded structure model theory which is suitable for coal of all ranks was developed from the previous one and a more complete theoretical system about the component and structure of coal was constructed. The whole establishment process of the theory was summarized and some of the main support data and analysis test results, including TEM, AFM, FTIR, GC/MS, MALDI/TOF/MS, DART/MSD, fractal analysis and so on were provided. The coal embedded structure theory fully considers both the identity and the particularity of all-rank coal, reflects the coal component and structure in the full range of coal rank, solves the systematic cognitive problem of coal component and structure on macro and micro level, and provides a valuable and meaningful theoretical approach for the coal processing and conversion technology. 展开更多
关键词 Coal structure Embedded structure model Theory construction All group components separation Coal of all coal ranks
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Luminescence Properties of Nanometer Si with Embedded Structure 被引量:1
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作者 LI Yu-guo ZHANG Jing-rao CUI Chuan-wen ZHANG Yue-fu 《Semiconductor Photonics and Technology》 CAS 2008年第1期61-64,共4页
Blue luminescence at about 431nm is obtained from epitaxial silicon after C+ implantation,annealing in hydrogen ambience and chemical etching sequentially.With increase of chemical etching,the blue peak is enhanced at... Blue luminescence at about 431nm is obtained from epitaxial silicon after C+ implantation,annealing in hydrogen ambience and chemical etching sequentially.With increase of chemical etching,the blue peak is enhanced at first,then decreased and substituted by a red peak at last.C=O compounds are introduced during C+ implantation and embedded in the surface of nanometer Si formed during annealing,and at last is formed nanometer silicon with embedded structure,which contributes to the blue emission.Presented is the possible mechanism of photoluminescence. 展开更多
关键词 C^+ implantation ANNEALING chemical etching embedded structure
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Luminescent Properties of Nanometer Si with Embedded Structure
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作者 LIZhong XINHua-mei +2 位作者 WANGQiang LIYu-guo LIHui-qi 《Semiconductor Photonics and Technology》 CAS 2004年第1期38-40,共3页
Blue luminescence at about 431 nm is obtained from epitaxial silicon after C^+ implantation,annealing in hydrogen ambience and chemical etching sequentially.When annealed in nitrogen ambience and etched accordingly,th... Blue luminescence at about 431 nm is obtained from epitaxial silicon after C^+ implantation,annealing in hydrogen ambience and chemical etching sequentially.When annealed in nitrogen ambience and etched accordingly,there is a much narrower peak at about 430 nm.During C^+ implantation,C=O compounds are introduced into and embedded in the surface of nanometer Si formed during annealing,at last,nanometer silicon with embedded structure is formed,which contributes to the blue emission. 展开更多
关键词 C^+ implantation ANNEALING Chemical etching Embedded structure
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The Influence of Soil Characteristics in Seismic Response of Embedded Structures
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作者 Adrian Popovici Cornel Ilinca Razvan Varvorea 《Journal of Geological Resource and Engineering》 2015年第1期17-27,共11页
The seismic response of a large wastewater collector box-type is performed by spectral analysis and direct time integration methods. The influence of mechanical characteristics of surrounding soil on structure seismic... The seismic response of a large wastewater collector box-type is performed by spectral analysis and direct time integration methods. The influence of mechanical characteristics of surrounding soil on structure seismic response is investigated. For this purpose the soil bulk modulus was successively considered 40,000 kPa and 80,000 kPa. The study points out the kinematic interaction soil-buried structure is usually more important than inertial interaction. Over wastewater collector is placed a river channel with 2.30 m deep water. The analysis shown the water from river channel led to significant increase in structure sectional stresses during seismic action. 展开更多
关键词 Embedded structures seismic response parametric study.
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Challenges and Solutions for Rural Mutual-Support Elderly Care:A Perspective of Embeddedness Theory
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作者 ZHAO Haohua 《Frontiers of Economics in China-Selected Publications from Chinese Universities》 2024年第3期335-356,共22页
In rural China,the trend of population aging and family hollowing is becoming increasingly severe.Traditional elderly care methods are no longer adequate to meet the growing demand for elderly care,leading to the emer... In rural China,the trend of population aging and family hollowing is becoming increasingly severe.Traditional elderly care methods are no longer adequate to meet the growing demand for elderly care,leading to the emergence of mutual-support elderly care as a new approach to elderly care.Mutual support has gained widespread practice and has become a vital component of the rural elderly service system.However,rural mutual-support elderly care encounters development bottlenecks,including local cultural resilience,disembedding of social relationships,gaps in policies and regulations,and multiple coordination challenges.Embeddedness theory emphasizes the need for social behavior to be embedded in the network of social connections,providing a valuable theoretical framework for mutual-support elderly care.Drawing on embeddedness theory,this paper investigates the accessibility of mutual-support elderly care in rural areas by examining cognitive embeddedness,relational embeddedness,systemic embeddedness,and structural embeddedness.By addressing the development bottlenecks of mutual-support elderly care in rural China,this paper aims to propose ideas for achieving high-quality development in rural mutual-support elderly care. 展开更多
关键词 mutual-support elderly care cognitive embeddedness relational embeddedness institutional embeddedness structural embeddedness
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Acoustics Performance Research and Analysis of Light Timber Construction Wall Elements Based on Helmholtz Metasurface 被引量:1
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作者 Si Chen Yuhao Zhou +3 位作者 Sarah Mohrmann Haiyan Fu Yuying Zou Zheng Wang 《Journal of Renewable Materials》 SCIE EI 2022年第11期2791-2803,共13页
Based on the efficient sound absorption characteristics of Helmholtz resonance structures in the range of medium and low frequency acoustic waves,this paper investigates an effective solution for light timber construc... Based on the efficient sound absorption characteristics of Helmholtz resonance structures in the range of medium and low frequency acoustic waves,this paper investigates an effective solution for light timber construction walls with acoustic problems.This study takes the light timber construction wall structure as the research object.Based on the Helmholtz resonance principle,the structure design of the wall unit,impedance tube experiment and COMSOL MULTIPHYSICS simulation calculation were carried out to obtain the change rule of acoustic performance of the Helmholtz resonance wall unit structure.The research results show that the overall stability of sound insulation of the structure is improved,and the frequency range with sound transmission loss more than 50 dB in the experimental group is 640–1600 Hz,while in the control group is 500–906 Hz and 1238–1600 Hz;the sound absorption performance of the structure is obviously better than that of the ordinary structure,especially in the low frequency acoustic wave range of 100–320 Hz,the sound absorption coefficient of the experimental group is more than 0.49,while the sound absorption coefficient of the control group is less than 0.1.It is expected that these results will contribute to the optimization of the acoustic performance of light timber construction walls and have high application and popularization value. 展开更多
关键词 Acoustic metasurface aperture embedded helmholtz resonance structure light timber construction low frequency
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A Simplified-Syntax-Based Static Structure Model for Embedded Software Analysis
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作者 XU Xiangyang LIU Qing +2 位作者 ZHANG Weixin YANG Guangyi LIU Jinshuo 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2016年第4期324-332,共9页
In order to solve the problem that the embedded software has the shortcoming of the platform dependence, this paper presents an embedded software analysis method based on the static structure model. Before control flo... In order to solve the problem that the embedded software has the shortcoming of the platform dependence, this paper presents an embedded software analysis method based on the static structure model. Before control flow and data flow analysis, a lexical analysis/syntax analysis method with simplified grammar and sentence depth is designed to analyze the embedded software. The experiments use the open source code of smart meters as a case, and the artificial faults as the test objects, repeating 30 times. Compared with the popular static analyzing tools PC-Lint and Splint, the method can accurately orient 91% faults, which is between PC-Lint's 95% and Splint's 85%. The result indicates that the correct rate of our method is acceptable. Meanwhile, by removing the platform-dependent operation with simplified syntax analysis, our method is independent of development environment. It also shows that the method is applicable to the compiled C(including embedded software) program. 展开更多
关键词 embedded system static structure model software analysis
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New progress in geometric computing for image and video processing 被引量:1
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作者 Jinjiang LI Hanyi GE 《Frontiers of Computer Science》 SCIE EI CSCD 2012年第6期769-775,共7页
In recent years, geometry-based image and video processing methods have aroused significant interest. This paper considers progress from four aspects: geometric characteristics and shape, geometric transformations, e... In recent years, geometry-based image and video processing methods have aroused significant interest. This paper considers progress from four aspects: geometric characteristics and shape, geometric transformations, embedded geometric structure, and differential geometry methods. Current research trends are also pointed out. 展开更多
关键词 IMAGE VIDEO geometric computing geometric patterns embedded geometry structure
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