精度

The computation of seismic traveltime is a core matter of ray-tracing method, and its accuracy affects the accuracy of the path and the accurate degree of the forward problem of seismic ray simulation.

地震波旅行时计算是射线追踪方法的核心问题，其精度直接影响着路径的精度和正演模拟的准确程度。

Reference frame's uniformation methods, adjustment methods and the implication of corresponding datum for various adjustment methods are systematically discussed about high precision GPS network. The systematical investigates on the choice of reference station in the high precision GPS data processing and the effect to adjustment results are made. Some general principles on the choice of reference station are presented.

系统地讨论了高精度GPS网数据处理中参考框架的统一方法、平差方法及各种平差方法所对应基准的意义，针对高精度GPS数据处理中基准站选取对平差结果的影响进行了系统地分析，提出了基准站选取的一般原则。

Based on the analysis and discussion of the normal methods, we developed some new methods for the dynamic monitor. The new methods include the multi-source data fusion technique, mixed pixel unmix method and a new dynamic monitor method for the different objects with same spectral value.

通过对常规监测方法试验结果的分析，确定影响监测精度的主要因素，提出了利用多源遥感数据融合技术、图像混合像元分解技术以及为解决&同谱异物&而采用的光谱变异类型细分技术的试验研究，从而改善了动态监测变化类型提取的效果，提高了监测精度。

The precision of the traditional ultrasonic localization method is limited due to unsufficiently precise estimation of the sound velocity and the time of flight, therefore, a new method, the special fusion method for redundancy ultrasonic information was proposed to solve the precision problem.

针对常规的超声波定位方法存在对决定定位精度的声速与渡越时间估算不准，导致定位精度有限的问题，提出了一种新的超声波绝对定位方法，即冗余超声波信息特殊融合法。

The output power could be adjusted with the change of control voltage, and the reflecting power could be gotten by measuring the output voltage of attenuator and detector. 4.The thrust measurement device was calibrated, and the accuracy was 2%FS. At the same time the signal of thrust measurement was input to the computer. E-type chromel-constantan thermocouple was used to measure the temperature of MPT, and the accuracy was 5%FS.The vacuum measurement was realized by using ZDF-5427M vacuometer, and the accuracy was 3%FS.

4对推力测量系统进行了标定并实现了计算机采集，推力测量系统最大相对误差为2％FS；温度测量目前还只限于对MPT谐振腔壁温的测量，使用E型镍铬—康铜热电偶即可较容易实现，其测量精度为5％FS；真空测量采用ZDF-5427M微机型复合真空计，其由热偶计和热阴极电离计复合而成，该真空计测量控制精度为3％FS。

For contrast experiments, k-means and DBSCAN algorithms are also implemented using Visual C++ 6. 0. We conducted a series of experiments, including the experiment of the correctness of clustering and outlier detection, the experiment of the precision of clustering and outlier detection. The experiment of the runtime, the experiment of the effect of clustering and outlier detection on parameters, the experiment of the impact of clustering and outlier detection precision by the order of data input, and the experiment of the effect of the algorithm validness by the density character of dataset.

本文使用Visual C++ 6.0实现了基于距离的聚类和孤立点检测算法、k-means算法和DBSCAN算法，做了大量的对比实验，包括聚类算法和孤立点检测正确性实验；聚类算法和孤立点检测精度实验；算法执行时间实验；参数对聚类和孤立点检测结果的影响实验；数据输入顺序对算法聚类和孤立点精度的影响实验；数据集密度对算法有效性的影响等。

Practice shows that this semiconductor laser self-mixing vibrometer can get good vibration waveform and vibration parameters from the vibration source.

可以测量出振动物体的振动频率、振幅以及还原振动波形，振动幅度测量精度可以达到0.325m，频率精度为1Hz。

In addition, a quantitative analysis of factors influencing the cavern imaging accuracy in the traditional and new methods provides a theoretical guide to improve the exploration accuracy of vuggy carbonate reservoirs.

同时，对常规偏移成像方法和逆散射成像方法影响溶洞成像精度的主要因素进行了定量分析，为提高溶洞型碳酸盐岩油气藏勘探精度提供了理论指导。图11参23

The filtering core is round column and welded with top and bottom covers bye anti-corrosive steel bar in wedgy section.The distance between every steel bar will be same and according to the filtering requirement.Several hoops are welded outside.So this filtering core has enough anti-deformed strength as well as high accuracy for filtering.

每个过滤元件呈圆筒状，采用楔形截面的耐蚀钢丝条与上下封焊接，每根丝条的间隔按过滤精度的要求等间隙均匀布置，在长度方向还焊有多道环箍，该滤芯不仅具有足够的搞变形的刚度和强度，而且可以严格保证过滤精度。

This device include: Renishaw's high-speed scanner (CYCLON SERIES2), the scanner can be laser-contact probe and probe each other's advantages, precision laser scanning for 0.05mm, contact scanning probe accuracy Up to 0.02mm.

这方面的设备还包括：英国雷尼绍公司的高速扫描仪（CYCLON SERIES2），该扫描仪可实现激光测头和接触式测头优势互补，激光扫描精度为0.05mm，接触式测头扫描精度达0.02mm。

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。