Terrestrial laser scanning(TLS) is a useful technology for rock mass characterization. A laser scanner produces a massive point cloud of a scanned area, such as an exposed rock surface in an underground tunnel,with mi...Terrestrial laser scanning(TLS) is a useful technology for rock mass characterization. A laser scanner produces a massive point cloud of a scanned area, such as an exposed rock surface in an underground tunnel,with millimeter precision. The density of the point cloud depends on several parameters from both the TLS operational conditions and the specifications of the project, such as the resolution and the quality of the laser scan, the section of the tunnel, the distance between scanning stations, and the purpose of the scans. One purpose of the scan can be to characterize the rock mass and statistically analyze the discontinuities that compose it for further discontinuous modeling. In these instances, additional data processing and a detailed analysis should be performed on the point cloud to extract the parameters to define a discrete fracture network(DFN) for each discontinuity set. I-site studio is a point cloud processing software that allows users to edit and process laser scans. This software contains a set of geotechnical analysis tools that assist engineers during the structural mapping process, allowing for greater and more representative data regarding the structural information of the rock mass, which may be used for generating DFNs. This paper presents the procedures used during a laser scan for characterizing discontinuities in an underground limestone mine and the results of the scan as applied to the generation of DFNs for further discontinuous modeling.展开更多
The moisture content of yarn and fabric is an important factor in textiles industry.A novel microwave method used for material moisture content measurements is described in this paper.It can estimate the moisture cont...The moisture content of yarn and fabric is an important factor in textiles industry.A novel microwave method used for material moisture content measurements is described in this paper.It can estimate the moisture content of the yarn roll with a standard deviation of 1.58% in the range of 0% to 90.00%.According to the actual size of the yarn,the yarn roll simulation model is established.The microwave attenuation variations arising from the changes in the conductivity and dielectric constant of the wet cone yarn from1.8 GHz to 5.0 GHz frequency are obtained by ultra-wideband antenna.The measured data are analyzed using the BP neural network.The result shows that it is a non-contact and online method to solve the moisture content of the yarn in the wide moisture content range.展开更多
针对现有农田监测系统在网关与服务器远程通信、视频信号传输、设备供电等方面存在的问题和缺陷,开发出一套基于无线传感网络的农田远程监测系统。系统以传感器节点、视频监控设备、无线网桥、ZigBee网关、远程服务器为硬件平台,以Visua...针对现有农田监测系统在网关与服务器远程通信、视频信号传输、设备供电等方面存在的问题和缺陷,开发出一套基于无线传感网络的农田远程监测系统。系统以传感器节点、视频监控设备、无线网桥、ZigBee网关、远程服务器为硬件平台,以Visual Studio 2012为软件开发环境,结合SQL Server2005数据库技术,实现远程服务器对大田现场的实时数据查询、历史数据查询、数据报表、视频查看、异常状态报警、辅助决策等功能,并提供PC和手机端的两种访问方式。实践表明:该系统实现了对监控区域环境数据、作物生长信息的有效监测,满足现代农业对农田监测的要求。展开更多
基金funded by the NIOSH Mining Program under Contract No. 200-2016-91300
文摘Terrestrial laser scanning(TLS) is a useful technology for rock mass characterization. A laser scanner produces a massive point cloud of a scanned area, such as an exposed rock surface in an underground tunnel,with millimeter precision. The density of the point cloud depends on several parameters from both the TLS operational conditions and the specifications of the project, such as the resolution and the quality of the laser scan, the section of the tunnel, the distance between scanning stations, and the purpose of the scans. One purpose of the scan can be to characterize the rock mass and statistically analyze the discontinuities that compose it for further discontinuous modeling. In these instances, additional data processing and a detailed analysis should be performed on the point cloud to extract the parameters to define a discrete fracture network(DFN) for each discontinuity set. I-site studio is a point cloud processing software that allows users to edit and process laser scans. This software contains a set of geotechnical analysis tools that assist engineers during the structural mapping process, allowing for greater and more representative data regarding the structural information of the rock mass, which may be used for generating DFNs. This paper presents the procedures used during a laser scan for characterizing discontinuities in an underground limestone mine and the results of the scan as applied to the generation of DFNs for further discontinuous modeling.
基金The Science&Technology Innovation Action Plan of International Science and Technology Cooperation Projects from SSTEC(No.14510711600)
文摘The moisture content of yarn and fabric is an important factor in textiles industry.A novel microwave method used for material moisture content measurements is described in this paper.It can estimate the moisture content of the yarn roll with a standard deviation of 1.58% in the range of 0% to 90.00%.According to the actual size of the yarn,the yarn roll simulation model is established.The microwave attenuation variations arising from the changes in the conductivity and dielectric constant of the wet cone yarn from1.8 GHz to 5.0 GHz frequency are obtained by ultra-wideband antenna.The measured data are analyzed using the BP neural network.The result shows that it is a non-contact and online method to solve the moisture content of the yarn in the wide moisture content range.
文摘针对现有农田监测系统在网关与服务器远程通信、视频信号传输、设备供电等方面存在的问题和缺陷,开发出一套基于无线传感网络的农田远程监测系统。系统以传感器节点、视频监控设备、无线网桥、ZigBee网关、远程服务器为硬件平台,以Visual Studio 2012为软件开发环境,结合SQL Server2005数据库技术,实现远程服务器对大田现场的实时数据查询、历史数据查询、数据报表、视频查看、异常状态报警、辅助决策等功能,并提供PC和手机端的两种访问方式。实践表明:该系统实现了对监控区域环境数据、作物生长信息的有效监测,满足现代农业对农田监测的要求。
