Optical fibers react with kinds of materials in high temperature and high pressure conditions downhole, which results in absorption loss increase of the optical fibers in the sensors used for permanent measurement downhole.
为了掌握井下永久性测量用光纤吸收损耗的增加情况,本文针对影响光纤吸收损耗的重要因素?氢与光纤的物理及化学反应进行了研究,分析了其影响机理,讨论了其对光纤测量性能及使用寿命的影响,仿真计算了氢与光纤发生的各种反应所导致的光纤吸收损耗的增加情况,得到了化学反应引起的吸收损耗增加是影响永久测量性能的主要因素的结论,并由此给出了有效减少氢对光纤井下永久测量影响的预防措施。
This paper introduces the generating of the management system of survey mark in Hebei province.
介绍了河北省测量标志管理系统的建立过程,对系统的整体设计、技术要点、功能应用及特点进行了概要描述。
Article27 Surveying and mapping personnel, when employing permanent surveying markers, must hold surveying and mapping work certificates and ensure that the surveying and mapping markers remain in good condition.
第二十七条测绘人员使用永久性测量标志，必须持有测绘工作证件，并保证该测量标志的完好。
Article 25 A unit that establishes permanent surveying markers shall set up distinct signs for such markers.
第二十五条建设永久性测量标志的单位应当对永久性测量标志设立明显标记。
The unit or individual responsible for taking care of the surveying and mapping markers shall inspect and examine if they are intact after employment.
负责保管该测量标志的单位和人员，应当查验使用后的测量标志的完好状况。
Study on the Design of Coded Target and Information Processing in Close-Range Photogrammetry;
近景摄影测量标志点设计及信息处理研究
Automatic Traffic Sign Detection Based on a Vehicle-Borne Mobile Mapping System
针对车载移动测量系统的交通标志自动检测
Fixed target is adopted as observation mark in marking targets of surveying radar.
在测量雷达空间标校目标时,采用固定觇牌作为观测标志。
a slender pointer for indicating the reading on the scale of a measuring instrument.
标志工作的在测量仪表刻度盘上的细的指示器。
A Study and Application of Targets in Industrial Digital Photogrammetry;
工业数字摄影测量中人工标志的研究与应用
Design and implementation of signs in the no-touch 3D measurement system;
无接触三维测量系统中标志点的设计与实现
Summary of Artificial Landmarks and Its Method's Application in Close-range Photogrammetry
近景摄影测量中人工标志点及其定位方法综述
Comparison and investigation of qualitative detection and quantitative detection of the serological markers of hepatitis B
乙肝血清学标志物定量与定性检测的对比研究
On Traffic Signs Investigation System Based on Vehicle Measurement
基于车载测量的交通标志调查系统研究
Remove of flag variables from the loops in evolutionary testing
进化测试中循环体内标志变量移除方法
Moment and Curvature Preserving Methods for Circular Targets Accurate Location
基于矩和曲率保持的圆形标志精确量测
Standardization and Quality Control for the Determination of Markers of Male Epididymis and Accessory Sex Glands;
男性附睾及附属性腺标志物检测的标准化和质量控制的研究
Located and marked position of pipe installations and passage holes in structures, using measuring instruments, such as ruler and level.
用测量工具，例如：尺及水平仪定位及作标志水管装置的位置、过的洞。
A Study of Correlativity between Femur Intramedullary Nail Length and Body Surface Sign Measurement;
健肢体表标志测量与股骨髓内钉长度的相关回归分析
Detection of the ipaH Gene of Shigella Using Molecular Beacon Probe-based Real-time Fluorescent Quantitative Polymerase Chain Reaction;
分子信标荧光定量PCR技术检测志贺菌ipaH基因的研究