基于小波理论的沉降监测数据序列分析

介绍了基于小波理论的沉降数据分析的理论背景、内容及实现方法。结合兖州地区某矿的沉降实测资料,研究了沉降数据降噪、沉降剧烈程度探测以及沉降数据中周期性识别3个方面的内容。

EFFECTIVE DETECTION DEPTH OF NEEDLE-LIKE OPTICAL PROBE

The effective detection depth of the needle-like optical probe is studied. The light transport model in highly scattering tissue is the diffusion equation and the boundary is Neuman. The sensitivity matrix is related to the position of the light source and the detector. It can be used to evaluate the effective detection depth. The sensitivity matrix is defined as the multiplication of the source and detector hght distribution. Six different groups about ix parameters including the source diameter and detector fibers, the core-to-core distance between the source and detector fibers, the opotode depth, the absorption, and reduced scattering coefficient, are used as experimental models. The relationship between the six parameters and the effective detection depth is analyzed. Resuits can be used to study the spatial resolution and the depth of multi-fibers.

Technical Procedure Determination of Thoron Indoor Concentration by LR-115 Type II

Thoron （Rn-220） is an invisible, odorless radioactive gas and nine times heavier than air. Purpose of project is to set up procedure to determine Rn-220 concentration which has been carried out in laboratory using Solid State Nuclear Track Detector （SSNTD） based passive detector technique. In this study, technical procedure has been applied in Karlsruhe diffusion chamber and LR-115, Type II strippable （Kodak Pathe, France） detector. The results have investigated how LR-115 work for Rn-220 by using Monazite ore to simultaneously measure Rn-222 and Rn-220. To carry out experiment, Karlsruhe diffusion chamber is used to with and without Poly-Ethylene （PE） membrane. Karlsruhe diffusion chamber with PE membrane only detect Rn-222, without PE membrane detect total Rn-222 and Rn-220. Precision evaluation by duplicate measure at 8 cm detector-source distance with relative standard deviation is less than 2.54%. Testing technical procedure, detectors have been sent to National Institute of Radiological Science （NIRS） for Rn-220 calibration exposure. After detectors have been calibration exposure at NIRS, it carried out all the following steps of procedure which set up at laboratory in 1NST, Vietnam. Finally, calibration factor calculated is 0.21 （tracks-cm2/Bq·m3·h） and constructed curve between integrated Tn-220 concentration and tracks density with factor R2 = 0.975.

基于势场导引的空地跨域协同探测方法

对未知区域的探测一直是无人系统的典型任务场景,具有广泛的应用性。但探测过程中各种信息通常十分冗杂,仅一次覆盖探测往往无法获取任务所需的全部信息。针对此,受人工势场法启发,提出了一种通过势场来为空地异构无人平台提供导引的探测策略。首先,将未知区域进行栅格化处理;其次,针对无人机与无人车在探测过程中的特点与优势分别为其设计不同的势场函数,使得无人机与无人车组成的异构无人系统优势互补,能在较短的时间内安全无碰撞地实现协同探测;最后,搭建仿真环境对提出的探测策略进行验证,并与其他传统算法进行对比。仿真结果表明,所提出的协同探测策略能导引无人系统以较短时间在任务区域内多次覆盖探测,以达到任务规定探测程度且探测完成时间相比于覆盖路径规划的传统方法降低了约41%,具备一定的时间优越性。