精度

This article summarizes the electric log technology applying to low-resistivity, low-porosity, low-permeable pay zones and fractured reservoirs. To study the influence of drilling-mud invasion and pore texture to oil zone resistivity and its electric log response rule," in-time log " and pressure gradient log should beapplied.

今后要研究钻井液侵入与孔隙结构对油层电性质和电法测井响应规律的影响，采用"及时测井"和压力梯度测井等技术措施；测井计算饱和度技术已日趋成熟，但需采用高精度数控测井等先进适用技术和更精细的"岩心刻度测井"解释方法，进一步提高精度，以满足低孔、低渗储集层和裂缝型复杂岩性储集层的更高要求。

The axes of length to diameter ratio bigger than 20 is called the thin major axis .

长径比大于20的轴称为细长轴，由于刚性很差，在加工中产生的切削力、切削热、振动等因素将直接影响工件加工的尺寸精度和形位精度，加工难度大。

To 6500m a.s.l.. In September 1998, an 80.36m ice core was also recovered in accumulation zone of the East Rongbuk Glacier on the northern slope of Mount Everest. The ice core was dated by seasonal variations of δ〓O (measured by Mat-Plus gas isotopic mass spectrograph with precision of 0.5‰) and major ions (measured by DX-2010 ions chromatography with precision of ng/L), together with the references of β activity peaks. Annual net accumulation was reconstructed based on the dating and density profile of the ice core.

此外，笔者还参加了1998年9月东绒布冰川80.36m冰芯的钻取工作。1999-2000年，在实验室内对上述样品进行了δ〓O测量(在中科院寒区旱区环境与工程研究所冰芯与寒区环境开放研究实验室用Mat-Plus气体稳定同位素质谱仪测量，以δ〓O平均值为-20.05‰的希夏邦马峰地区大气降水作为标准水，测量精度为0.5‰)、主要可溶性阴阳离子浓度的测定(在美国新罕布什尔大学气候变化研究中心进行，测试仪器为DX-2010型离子色谱仪，其测量精度可达ng/L)以及β活化度的测量(在美国新罕布什尔大学气候变化研究中心进行)，并以此为基础尝试重建了该冰芯的年代和净积累量。

The results showed that the average deviation of density between the experimental data and the data provided by the National Institute of Standards and Technology was below ±0.064%,and that the maximum deviation was below ±0.356%.

为了获得高精度的实验数据，国内清华大学、西安交通大学、中国科技大学等以及国外一些研究机构都自行研制了高精度的PVT实验系统[1-5]。

Based on the model, the measurability analysis of fairway design, the precision control of model and the simulation valuation are discussed.

高阶线性方程组的精度分析，难以给出解析表达，为此提出了系数矩阵与常数项向量的行／列精度控制的方法。

Error compensation is the economic and effective way to improve the accuracy of Coordinate Measuring Machine.

误差补偿是提高三坐标测量机整体精度的经济而有效的手段，本文利用精度等级更高的激光干涉仪对三坐标测量机的X轴直线度误差进行了测量，并得出了初步结论，为以后进行误差补偿提供了依据。

The structure and working principle of this system are introduced,and those factors that influence its metrical precision are analyzed.

介绍了该系统的结构及其工作原理，分析了影响系统测量精度的因素，理论上估算的测量精度为2×10-5。

However, the technology progresses rapidly, the accuracy of the products has increased to micrometer and nanometer.

然而，科技进展快速，各种工业产品的精度要求更大幅度提高，产品之精度要求已达到微米及奈米的程度。

This paper focuses on the subject of high precision vertical pendulum tiltmeter, and studies deeply a series of problems that involve in high precision capacity micrometry sensor, the mechanical structure of the tiltmeter and its parts, adjusting pendulum and calibration of tiltmeter, and practical application of the vertical pendulum tiltmeter.

本文围绕高精度垂直摆倾斜仪这一主题，对高精度电容测微传感器，倾斜仪机械本体的结构及其零部件，倾斜仪的调摆和标定，以及垂直摆倾斜仪的实际应用等一系列问题进行了较为深入的研究。

Simulation results show that the proposed algorithm can improve the accuracy of clock synchronization among IGPS base stations and the synchronization accuracy can reach the microsecond order of magnitude.

仿真结果表明，该方法能够提高IGPS基站间的时钟同步精度，使同步精度达到微秒量级。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。