MIC is one of the main problems of circulating cooling water system. The direct economic loss by MIC is about 300 to 500 billion dollars. It is good to understand MIC in order to control MIC. Source and species of mic...MIC is one of the main problems of circulating cooling water system. The direct economic loss by MIC is about 300 to 500 billion dollars. It is good to understand MIC in order to control MIC. Source and species of microorganisms was introduced firstly. There are three kinds of microorganisms in the system, including bacteria, fungi and algae. Species of these microorganisms are shown in the paper. Then, mechanisms of MIC are analysed. Although there is no universal mechanism of MIC, MIC is still mainly an electrochemical corrosion in nature. Meanwhile, the mechanisms on SRB and iron bacteria are introduced in details. At last, several methods of microorganisms control are put forward in the paper.展开更多
The first multi-color light curve analysis of the AH Mic binary system is presented.This system has very few past observations from the southern hemisphere.We extracted the minima times from the light curves based on ...The first multi-color light curve analysis of the AH Mic binary system is presented.This system has very few past observations from the southern hemisphere.We extracted the minima times from the light curves based on the Markov Chain Monte Carlo(MCMC)approach and obtained a new ephemeris.To provide modern photometric light curve solutions,we used the Physics of Eclipsing Binaries(PHOEBE)software package and the MCMC approach.Light curve solutions yielded a system temperature ratio of 0.950,and we assumed a cold starspot for the hotter star based on the O’Connell effect.This analysis reveals that AH Mic is a W-subtype W UMa contact system with a fill-out factor of 21.3%and a mass ratio of 2.32.The absolute physical parameters of the components are estimated by using the Gaia Early Data Release 3(EDR3)parallax method to be M_(h)(M_(⊙))=0.702(26),M_(c)(M_(⊙))=1.629(104),R_(h)(R_(⊙))=0.852(21),R_(c)(R_(⊙))=1.240(28),L_(h)(L_(⊙))=0.618(3)and L_(c)(L_(⊙))=1.067(7).The orbital angular momentum of the AH Mic binary system was found to be 51.866(35).The components’positions of this system are plotted in the Hertzsprung-Russell diagram.展开更多
文摘随着建筑工业化进程的不断推进,模块化集成建筑(Modular Integrated Construction,MIC)凭借其高效、环保与可控性强等优势,已在建筑工程中得到广泛应用。然而,MIC项目中装配式构件种类繁多、节点构造复杂,且工厂预制与现场安装环节高度耦合,致使施工协调难度加剧、进度管理日趋复杂。文章基于建筑信息模型(Building Information Modeling,BIM)技术,探讨其在MIC装配式建筑施工协调与进度管理中的应用策略,通过构建BIM三维模型和建立统一信息平台,实现构件从设计、预制至安装全过程的可视化管理,并借助4D建模优化施工排程,增强进度计划的可控性与动态调整能力。研究表明,BIM技术可有效提升MIC项目的施工管理水平,助力建筑产业现代化发展。
文摘MIC is one of the main problems of circulating cooling water system. The direct economic loss by MIC is about 300 to 500 billion dollars. It is good to understand MIC in order to control MIC. Source and species of microorganisms was introduced firstly. There are three kinds of microorganisms in the system, including bacteria, fungi and algae. Species of these microorganisms are shown in the paper. Then, mechanisms of MIC are analysed. Although there is no universal mechanism of MIC, MIC is still mainly an electrochemical corrosion in nature. Meanwhile, the mechanisms on SRB and iron bacteria are introduced in details. At last, several methods of microorganisms control are put forward in the paper.
基金funded in part by the National Science Foundation(NSF 1517474,1909109)the National Aeronautics and Space Administration(NASA 17-ADAP17-68)。
文摘The first multi-color light curve analysis of the AH Mic binary system is presented.This system has very few past observations from the southern hemisphere.We extracted the minima times from the light curves based on the Markov Chain Monte Carlo(MCMC)approach and obtained a new ephemeris.To provide modern photometric light curve solutions,we used the Physics of Eclipsing Binaries(PHOEBE)software package and the MCMC approach.Light curve solutions yielded a system temperature ratio of 0.950,and we assumed a cold starspot for the hotter star based on the O’Connell effect.This analysis reveals that AH Mic is a W-subtype W UMa contact system with a fill-out factor of 21.3%and a mass ratio of 2.32.The absolute physical parameters of the components are estimated by using the Gaia Early Data Release 3(EDR3)parallax method to be M_(h)(M_(⊙))=0.702(26),M_(c)(M_(⊙))=1.629(104),R_(h)(R_(⊙))=0.852(21),R_(c)(R_(⊙))=1.240(28),L_(h)(L_(⊙))=0.618(3)and L_(c)(L_(⊙))=1.067(7).The orbital angular momentum of the AH Mic binary system was found to be 51.866(35).The components’positions of this system are plotted in the Hertzsprung-Russell diagram.
文摘三维激光雷达通过发射激光束并精准测算反射光的返回时间,获取模块表面的三维坐标,从而生成丰富的点云数据。该技术对于MiC(模块化集成建筑,Modular Integrated Construction)模块尺寸检验具有高效性,能快速地对模块轮廓是否满足出场和拼装精度要求进行快速判别。采用三维激光雷达扫描一个外形较为规整的模块建筑,鉴于原始点云数据量巨大,利用点云下采样技术,在保留关键特征基础上,对数据进行轻量化处理。接着,基于SCAN vs BIM技术,将处理后的点云与已构建的BIM模型精准匹配,从而准确判别模块制造误差。结果表明:相较于人工检测,该方法只需1人现场操作,可大幅提升模块出场尺寸检验效率、降低人工成本、提升企业收益。研究成果与工程经验可为MiC模块尺寸检验提供思路,并为虚拟预拼装技术提供重要参考。
