【摘 要】
：
Buried pipelines are an essential component of the urban infrastructure of modern cities.Traditional buried pipes are mainly made of metal materials.With the development of material science and technology in recent years,non-metallic pipes,such as plastic
【机 构】
：
School of Mechanical and Electrical Engineering,Southwest Petroleum Uni-versity,Chengdu 610500,China
论文部分内容阅读
Buried pipelines are an essential component of the urban infrastructure of modern cities.Traditional buried pipes are mainly made of metal materials.With the development of material science and technology in recent years,non-metallic pipes,such as plastic pipes,ceramic pipes,and concrete pipes,are increasingly taking the place of pipes made from metal in various pipeline networks such as water supply,drainage,heat,industry,oil,and gas.The loca-tion technologies for the location of the buried metal pipeline have become mature,but detection and location technologies for the non-metallic pipelines are still developing.In this paper,current trends and future perspectives of detection and location of buried non-metallic pipelines are summarized.Initially,this paper reviews and analyzes electromagnetic induction technologies,electromagnetic wave technologies,and other physics-based technologies.It then focuses on acoustic detection and location technologies,and finally introduces emerging technologies.Then the technical characteristics of each detection and location method have been compared,with their strengths and weaknesses identified.The current trends and future perspectives of each buried non-metallic pipeline detection and location technology have also been defined.Finally,some suggestions for the future development of buried non-metallic pipeline detection and location technologies are provided.
其他文献
音臂线缆与连接器更换后声音会有改善吗?rn音臂线缆(简称“臂线”)与连接器的好坏对声音是有影响的,换上质量优异的臂线与连接器,声音听感效果无疑会有改善.即使是昂贵的音臂,通常也可以通过臂线与连接器的更换进一步提高音臂性能,使声音更加杰出.作为音臂与唱头连接的线缆,非常好的屏蔽与非常灵活的平衡性是必须的.良好屏蔽的可取之处是可以避免循迹中的拾音受到电磁和射频干扰,从而使音乐声听感异常.而平衡的高灵活性的可取之处则在于能有效抑制沿臂线从外部唱机转盘传输给音臂支架和唱头的机械振动,否则,唱片重放会受到机械噪音干
It is very necessary for an intelligent heavy truck to have the ability to prevent rollover independently.However,it was rarely considered in intelligent vehicle motion planning.To improve rollover stability,a motion planning strategy with autonomous anti
Compared with conventional forming processes,ultrasonic-assisted forming technology with a high frequency and small amplitude can significantly improve the forming quality of materials.Owing to the advantages of reduced forming force,improved surface qual
Advanced mathematical tools are used to conduct research on the kinematics analysis of hybrid mechanisms,and the generalized analysis method and concise kinematics transfer matrix are obtained.In this study,first,according to the kinematics analysis of se
Planning and decision-making technology at intersections is a comprehensive research problem in intelligent transportation systems due to the uncertainties caused by a variety of traffic participants.As wireless communication advances,vehicle infrastructu
针对汽车退役电池应用于移动通信基站电源系统的研究,从退役电池的技术可行性与经济可行性两方面进行阐述,详细描述电池梯级利用的安全性、使用寿命、电池一致性、电池的充放电性能,体现了梯级磷酸铁锂电池在技术性能上具有巨大的利用价值,探讨完全租赁与部分租赁的运营模式,梯级磷酸铁锂电池相对于铅酸蓄电池具有较大的盈利空间,能为企业带来较好的经济效益.
以往的阀控式密封铅酸蓄电池(VRLA)管理技术主要是端电压测量、阻抗测量和可利用容量测量,但存在管理效率低,耗费人力物力等资源量大,蓄电池的实时状况管理存在盲区等问题.蓄电池在线监测智能化管理技术在实现VRLA电池的智能化管理和运维、避免运管盲区、提高系统保障能力的可靠性、延长服役的生命周期等方面的优势,已成为当下研究的重点.
Walking assistance can be realized by active and passive robotic walkers when their users walk on even roads.However,fast signal processing and real-time control are necessary for active robotic walkers when the users walk on slopes,while assistive forces
党的十九大报告提出,“打造共建共治共享的社会治理格局.加强社会治理制度建设,完善党委领导、政府负责、社会协同、公众参与、法治保障的社会治理体制,提高社会治理社会化、法治化、智能化、专业化水平.”以物联网、云计算、下一代互联网技术为代表的新一轮信息技术革命势头不减,并以其独有的渗透性、冲击性、倍增性和创新型席卷全球,推动着以智能、绿色和可持续为特征的新一轮科技革命和产业革命.依据社会治理政策,结合对行业的深刻理解,依托中国电信强大的互联网技术资源、线路资源,充分将物联网技术、云计算技术、移动互联网技术、大数
In hydraulic area,independent metering control(IMC)technology is an effective approach to improve system effi-ciency and control flexibility.In addition,digital hydraulic technology(DHT)has been verified as a reasonable method to optimize system dynamic p