The magnetic resonance spectroscopy(MRS)results are greatly influenced by reconstruction of the spectrum and quantitative analysis.Because of this requirement a number of programs dedicated to MRS data analysis were d...The magnetic resonance spectroscopy(MRS)results are greatly influenced by reconstruction of the spectrum and quantitative analysis.Because of this requirement a number of programs dedicated to MRS data analysis were developed.The selection and use of appropriate software is crucial not only in clinical procedures,but also while carrying out scientific research.The choice of the software to suit the user's needs should be based on the analysis of the functionality of the program.It is particularly important from the user's viewpoint to identify what data can be loaded and processed in the program.The specific programs allow the user different degree of control over analysis parameters.Moreover,the programs for MRS data analysis differ in terms of the applied signal processing algorithms.The aim of this work,therefore,is to review available packages designed for MRS data analysis,taking into account their capabilities and limitations.展开更多
Evaluation of the performance of existing support in underground tunnels is of great importance for production and interests.Based on field investigation,the shape and number of joints and fractures were investigated ...Evaluation of the performance of existing support in underground tunnels is of great importance for production and interests.Based on field investigation,the shape and number of joints and fractures were investigated in the mining area.Then,the stability of each structural blocks is analyzed by 3D wedge stability analysis software(Unwedge).Moreover,a new analysis method based on critical block theory is applied to analyze the stability of excavated laneways in continuous and discontinuous rock and monitor the stress changes in a fractured tunnel rock mass.The test results indicate that the 3D wedge stability analysis software for underground excavation can evaluate deep tunnel support.Besides,there is no direct relation between the size of the block and the instability of the tunnel.The support method,on large and thick key blocks,needs to be improved.In a broken tunnel section,U-shaped steel support can effectively promote the stress state of the surrounding rock.By monitoring the surrounding rock,it is proven that the vibrating string anchor stress monitoring system is an efficient and real-time method for tunnel stability evaluation.展开更多
In order to study the safety factor and instability process of cohesive soil slope, the discrete element method(DEM) was applied. DEM software PFC2 D was used to simulate the triaxial test to study the influence of th...In order to study the safety factor and instability process of cohesive soil slope, the discrete element method(DEM) was applied. DEM software PFC2 D was used to simulate the triaxial test to study the influence of the particle micro parameters on the macroscopic characteristics of cohesive soil and calibrate the micro parameters of DEM model on this basis. Embankment slope stability analysis was carried out by strength reduction and gravity increase method, it is shown that the safety factor obtained by strength reduction method is more conservative, and the arc-shaped feature of the sliding surface under the gravity increase method is more obvious. Throughout the progressive failure process, the failure trends, maximum displacements, and velocity changes obtained by the two methods were consistent. When slope was destroyed, the upper part was cracked, the middle part was sheared, and the lower part was destroyed by extrusion. The conclusions of this paper can be applied to the safety factor calculation of cohesive soil slopes and the analysis of the instability process.展开更多
为深入了解草畜平衡领域的研究进展与前沿热点,以Web of Science(WOS)核心合集数据库和中国知网(CNKI)数据库中的相关文献为数据源,基于文献计量分析方法,利用VOSviewer 1.6.20和CiteSpace 6.2.R6软件对国内外相关研究的国家、机构、作...为深入了解草畜平衡领域的研究进展与前沿热点,以Web of Science(WOS)核心合集数据库和中国知网(CNKI)数据库中的相关文献为数据源,基于文献计量分析方法,利用VOSviewer 1.6.20和CiteSpace 6.2.R6软件对国内外相关研究的国家、机构、作者合作网络及关键词共现、聚类、突现等进行分析,明确了草畜平衡领域的研究热点与发展趋势。结果表明:(1)国内外草畜平衡研究的发文量逐年上升,国际发文量的增速大于国内;(2)中国、美国和德国为发文量最多的国家,研究力量主要集中在高等院校和研究机构,中国科学院和内蒙古农业大学为此类研究的重要机构;(3)《草原与草坪》和Agricultural and Forest Meteorology分别为此类研究发文量最大的中文、英文期刊,草畜平衡研究中畜牧与动物医学是国内最受欢迎的学科类别,而环境科学是国际最受欢迎的学科类别;(4)目前草畜平衡领域研究内容以草地生态保护及土地利用、草原生态补偿政策及影响因素、草地植被及草地资源为主。研究指出,未来草畜平衡领域的研究重点将关注中国的新疆、青海、内蒙古以及黄土高原等地区,应加强载畜率、家畜数量、家庭牧场以及草原生态保护补偿政策的研究。同时,探索放牧、休牧、禁牧等草地生态系统管理措施对草畜平衡研究的影响机制。展开更多
灌溉排水是盐碱地改良利用的基础性措施,它通过降低土壤盐分、改善土壤理化性质、促进土壤微生物活动等方式,为盐碱地可持续发展与生态恢复提供有效保障。基于CiteSpace软件对1992-2024年国内外关于灌溉排水改良盐碱地研究领域的文献进...灌溉排水是盐碱地改良利用的基础性措施,它通过降低土壤盐分、改善土壤理化性质、促进土壤微生物活动等方式,为盐碱地可持续发展与生态恢复提供有效保障。基于CiteSpace软件对1992-2024年国内外关于灌溉排水改良盐碱地研究领域的文献进行可视化分析。结果表明:该领域发文量总体呈攀升趋势,发文较多的期刊有《Agricultural Water Management》、《农业工程学报》、《灌溉排水学报》等,发文较多的国家有中国、美国、澳大利亚等,其中我国在该领域的影响较为显著。当前该领域在暗管排水排盐、微咸水灌溉、滴灌控盐等方向较为活跃,未来将朝着精准控盐技术创新优化、综合改良体系构建等方向发展,以深入应对极端气候精准控盐挑战,并探索生态水文控盐技术等新型改良措施,助力盐碱地改良与土地生态的永续发展。展开更多
文摘The magnetic resonance spectroscopy(MRS)results are greatly influenced by reconstruction of the spectrum and quantitative analysis.Because of this requirement a number of programs dedicated to MRS data analysis were developed.The selection and use of appropriate software is crucial not only in clinical procedures,but also while carrying out scientific research.The choice of the software to suit the user's needs should be based on the analysis of the functionality of the program.It is particularly important from the user's viewpoint to identify what data can be loaded and processed in the program.The specific programs allow the user different degree of control over analysis parameters.Moreover,the programs for MRS data analysis differ in terms of the applied signal processing algorithms.The aim of this work,therefore,is to review available packages designed for MRS data analysis,taking into account their capabilities and limitations.
基金Projects(51964007,51774101)supported by the National Natural Science Foundation of ChinaProject(2016-4011)supported by the High-level Innovative Talents Training Project in Guizhou Province,ChinaProject(2019-5619)supported by the Guizhou Mining Power Disaster Early Warning and Control Technology Innovation Team,China。
文摘Evaluation of the performance of existing support in underground tunnels is of great importance for production and interests.Based on field investigation,the shape and number of joints and fractures were investigated in the mining area.Then,the stability of each structural blocks is analyzed by 3D wedge stability analysis software(Unwedge).Moreover,a new analysis method based on critical block theory is applied to analyze the stability of excavated laneways in continuous and discontinuous rock and monitor the stress changes in a fractured tunnel rock mass.The test results indicate that the 3D wedge stability analysis software for underground excavation can evaluate deep tunnel support.Besides,there is no direct relation between the size of the block and the instability of the tunnel.The support method,on large and thick key blocks,needs to be improved.In a broken tunnel section,U-shaped steel support can effectively promote the stress state of the surrounding rock.By monitoring the surrounding rock,it is proven that the vibrating string anchor stress monitoring system is an efficient and real-time method for tunnel stability evaluation.
基金Project(51808116) supported by the National Natural Science Foundation of ChinaProject(BK20180404) supported by the Natural Science Foundation of Jiangsu Province, China+1 种基金Project(KFJ170106) supported by the Changsha University of Science & Technology via Open Fund of National Engineering Laboratory of Highway Maintenance Technology,ChinaProject(242020R40133) supported by Fundamental Research Funds for the Central Universities, China。
文摘In order to study the safety factor and instability process of cohesive soil slope, the discrete element method(DEM) was applied. DEM software PFC2 D was used to simulate the triaxial test to study the influence of the particle micro parameters on the macroscopic characteristics of cohesive soil and calibrate the micro parameters of DEM model on this basis. Embankment slope stability analysis was carried out by strength reduction and gravity increase method, it is shown that the safety factor obtained by strength reduction method is more conservative, and the arc-shaped feature of the sliding surface under the gravity increase method is more obvious. Throughout the progressive failure process, the failure trends, maximum displacements, and velocity changes obtained by the two methods were consistent. When slope was destroyed, the upper part was cracked, the middle part was sheared, and the lower part was destroyed by extrusion. The conclusions of this paper can be applied to the safety factor calculation of cohesive soil slopes and the analysis of the instability process.
文摘为深入了解草畜平衡领域的研究进展与前沿热点,以Web of Science(WOS)核心合集数据库和中国知网(CNKI)数据库中的相关文献为数据源,基于文献计量分析方法,利用VOSviewer 1.6.20和CiteSpace 6.2.R6软件对国内外相关研究的国家、机构、作者合作网络及关键词共现、聚类、突现等进行分析,明确了草畜平衡领域的研究热点与发展趋势。结果表明:(1)国内外草畜平衡研究的发文量逐年上升,国际发文量的增速大于国内;(2)中国、美国和德国为发文量最多的国家,研究力量主要集中在高等院校和研究机构,中国科学院和内蒙古农业大学为此类研究的重要机构;(3)《草原与草坪》和Agricultural and Forest Meteorology分别为此类研究发文量最大的中文、英文期刊,草畜平衡研究中畜牧与动物医学是国内最受欢迎的学科类别,而环境科学是国际最受欢迎的学科类别;(4)目前草畜平衡领域研究内容以草地生态保护及土地利用、草原生态补偿政策及影响因素、草地植被及草地资源为主。研究指出,未来草畜平衡领域的研究重点将关注中国的新疆、青海、内蒙古以及黄土高原等地区,应加强载畜率、家畜数量、家庭牧场以及草原生态保护补偿政策的研究。同时,探索放牧、休牧、禁牧等草地生态系统管理措施对草畜平衡研究的影响机制。
文摘灌溉排水是盐碱地改良利用的基础性措施,它通过降低土壤盐分、改善土壤理化性质、促进土壤微生物活动等方式,为盐碱地可持续发展与生态恢复提供有效保障。基于CiteSpace软件对1992-2024年国内外关于灌溉排水改良盐碱地研究领域的文献进行可视化分析。结果表明:该领域发文量总体呈攀升趋势,发文较多的期刊有《Agricultural Water Management》、《农业工程学报》、《灌溉排水学报》等,发文较多的国家有中国、美国、澳大利亚等,其中我国在该领域的影响较为显著。当前该领域在暗管排水排盐、微咸水灌溉、滴灌控盐等方向较为活跃,未来将朝着精准控盐技术创新优化、综合改良体系构建等方向发展,以深入应对极端气候精准控盐挑战,并探索生态水文控盐技术等新型改良措施,助力盐碱地改良与土地生态的永续发展。
