三维可视化激光扫描技术在深井软岩巷道应用主要为了明晰巷道在回采过程中围岩变形和破坏情况,并解决传统监控监控量测数据量少、可视化程度低、数据利用率低等问题。本文采用三维点云处理软件Tunnelkey 3D Point Clouds Processing&...三维可视化激光扫描技术在深井软岩巷道应用主要为了明晰巷道在回采过程中围岩变形和破坏情况,并解决传统监控监控量测数据量少、可视化程度低、数据利用率低等问题。本文采用三维点云处理软件Tunnelkey 3D Point Clouds Processing&Analyzing System(简称:TK-PCAS)处理实际巷道断面点云轮廓与巷道设计轮廓数据并分析其净空超侵限情况。为了充分掌握变形段支护钢架的变形情况,建立巷道三维模型云图,直接提取钢架断面点云数据,通过与初测钢架断面分析对比得到钢架沉降以及两帮变形的量值,并对全站仪监测的数据与扫描仪监测的数据在量值与发展趋势状态上进行对比论证。结果表明:三维激光扫描技术可以对巷道初期支护结构超侵限情况进行准确科学的评估,并对侵限欠挖部位的初支结构进行指导整改施工;在变形监测方面,与传统监测方式下的数据在量值与发展趋势状态上基本一致,且三维激光扫描技术突破了传统单点式监测的局限性,使得巷道在纵向与环向方向上的监测信息更全面,可视化程度更高。为后期确定巷道围岩变形量级,改进优化巷道支护体系提供了数据支持。展开更多
An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, clo...An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, cloud data de-noising optimization, construction, display and operation of three-dimensional model, model editing, profile generation, calculation of goaf volume and roof area, Boolean calculation among models and interaction with the third party soft ware. Concerning this system with a concise interface, plentiful data input/output interfaces, it is featured with high integration, simple and convenient operations of applications. According to practice, in addition to being well-adapted, this system is favorably reliable and stable.展开更多
Recent advances in endoscopic imaging techniques have revolutionized the diagnostic approach of patients with inflammatory bowel disease(IBD).New,emerging endoscopic imaging techniques visualized a plethora of new muc...Recent advances in endoscopic imaging techniques have revolutionized the diagnostic approach of patients with inflammatory bowel disease(IBD).New,emerging endoscopic imaging techniques visualized a plethora of new mucosal details even at the cellular and subcellular level.This review offers an overview about new endoscopic techniques,including chromoendoscopy,magnification endoscopy,spectroscopy,confocal laser endomicroscopy and endocytoscopy in the face of IBD.展开更多
The objective of this study is to apply the shock wave for control in a micro channel. The shock wave was generated by a laser focusing of pulsed laser beam in the channel. Using a pulse laser to generate a shock wave...The objective of this study is to apply the shock wave for control in a micro channel. The shock wave was generated by a laser focusing of pulsed laser beam in the channel. Using a pulse laser to generate a shock wave, a non-stationary flow was induced in the small space between the parallel plates. The spherical and cylindrical shock propagations were observed with schlieren method. The shock Mach number decreases with time and approaches to unity. As reported in the previous investigations, the shock speed was attenuated in a short distance and time. In the present experiment, It was not found a remarkable difference in the shock speed between the spherical and cylindrical shock experiments. Subsequently, the flow induced by the cylindrical shock wave was studied using PIV technique. A smoke tracer was used in the experiment and its velocity was measured within 100 μs. A numerical simulation was carried out to investigate the momentum relaxation between the gas and smoke particle. A suitable shock initiation model was introduced in the simulation. The experimental results show that a wide acceleration and deceleration zone exist behind the shock wave. Also, the relaxation distance in the experimental data is much longer than that in numerical simulation.展开更多
文摘三维可视化激光扫描技术在深井软岩巷道应用主要为了明晰巷道在回采过程中围岩变形和破坏情况,并解决传统监控监控量测数据量少、可视化程度低、数据利用率低等问题。本文采用三维点云处理软件Tunnelkey 3D Point Clouds Processing&Analyzing System(简称:TK-PCAS)处理实际巷道断面点云轮廓与巷道设计轮廓数据并分析其净空超侵限情况。为了充分掌握变形段支护钢架的变形情况,建立巷道三维模型云图,直接提取钢架断面点云数据,通过与初测钢架断面分析对比得到钢架沉降以及两帮变形的量值,并对全站仪监测的数据与扫描仪监测的数据在量值与发展趋势状态上进行对比论证。结果表明:三维激光扫描技术可以对巷道初期支护结构超侵限情况进行准确科学的评估,并对侵限欠挖部位的初支结构进行指导整改施工;在变形监测方面,与传统监测方式下的数据在量值与发展趋势状态上基本一致,且三维激光扫描技术突破了传统单点式监测的局限性,使得巷道在纵向与环向方向上的监测信息更全面,可视化程度更高。为后期确定巷道围岩变形量级,改进优化巷道支护体系提供了数据支持。
基金Project(51274250)supported by the National Natural Science Foundation of ChinaProject(2012BAK09B02-05)supported by the National Key Technology R&D Program during the 12th Five-year Plan of China
文摘An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, cloud data de-noising optimization, construction, display and operation of three-dimensional model, model editing, profile generation, calculation of goaf volume and roof area, Boolean calculation among models and interaction with the third party soft ware. Concerning this system with a concise interface, plentiful data input/output interfaces, it is featured with high integration, simple and convenient operations of applications. According to practice, in addition to being well-adapted, this system is favorably reliable and stable.
文摘Recent advances in endoscopic imaging techniques have revolutionized the diagnostic approach of patients with inflammatory bowel disease(IBD).New,emerging endoscopic imaging techniques visualized a plethora of new mucosal details even at the cellular and subcellular level.This review offers an overview about new endoscopic techniques,including chromoendoscopy,magnification endoscopy,spectroscopy,confocal laser endomicroscopy and endocytoscopy in the face of IBD.
文摘The objective of this study is to apply the shock wave for control in a micro channel. The shock wave was generated by a laser focusing of pulsed laser beam in the channel. Using a pulse laser to generate a shock wave, a non-stationary flow was induced in the small space between the parallel plates. The spherical and cylindrical shock propagations were observed with schlieren method. The shock Mach number decreases with time and approaches to unity. As reported in the previous investigations, the shock speed was attenuated in a short distance and time. In the present experiment, It was not found a remarkable difference in the shock speed between the spherical and cylindrical shock experiments. Subsequently, the flow induced by the cylindrical shock wave was studied using PIV technique. A smoke tracer was used in the experiment and its velocity was measured within 100 μs. A numerical simulation was carried out to investigate the momentum relaxation between the gas and smoke particle. A suitable shock initiation model was introduced in the simulation. The experimental results show that a wide acceleration and deceleration zone exist behind the shock wave. Also, the relaxation distance in the experimental data is much longer than that in numerical simulation.
