Feature extraction of welding defect based on machine vision

There are many flaws in welding images such as noise, low contrast, and blurred edges, which affect feature extraction from welding defect regions and impede classification and recognition of welding defects. To deal with the complexity of welding defect images, this paper proposes an effective method for extracting the features of welding defect regions. Firstly, image preprocessing, image segmentation and image background removal are carried out to a welding image in order to extract welding defect region; and then an 8-connected-component labeling method is used to mark defect regions. Finally, it extracts geometric characteristic parameters including perimeter, area, circularity and others. The experimental result shows that the method proposed in the paper can accurately extract the features of welding defect regions. It has good adaptability and practicability.     

宁夏黄河水权转换实践分析研究

宁夏中电投青铜峡迈科铝业有限公司临河动力站工程设计年取黄河地表水量436万m3,经计算工程水权转换节水量应为523.2万m3.通过对宁夏青铜峡灌区唐西总干渠3.0 km渠道进行衬砌,年可节约黄河耗水量535.5万m3,满足工程用水要求.该水权转换总费用为3 890.53万元,单位水量转换费用为0.29元/(m3·a).     

基于策略的网管浅析

由于多媒体业务的迅速增长对网络的压力越来越大,仅仅增加网络带宽已不足以解决业务量增长给网络带来的压力。网络管理人员还必须寻求管理网络资源的有效办法。过去,网络管理人员所采用的传统方法在很大程度上是以设备为中心的,执行管理和监控功能的着眼点放在网络环境中确定和利用特定协议和特定设备中的地址配置。网络管理人员必须采用设备特有的密码指令来执行这些管理功能。 基于策略的网络管理明显改进了网络管理人员过去所遵循的传统方法,它使业务和网络管理人员能够采用业务规则,并使这些业务规则自动转换为设备特有的指令,从而模拟…     

马舍坑滑坡稳定性计算分析及防治对策

在收集地质测绘、勘探、现场观测等资料的基础上,详细地论述了滑坡空间形态、滑坡物质组成及结构特征、滑坡的地质环境条件、滑坡水文地质特征;分析探讨了滑坡形成机制,并对滑坡的稳定性进行计算分析,最后根据滑坡的环境地质特点提出治理建议.