电阻率法和激发极化法在地下水勘查中的应用

依据提供的物性参数的不同,广泛应用于找水工作的电法手段可分为电阻率法和激发极化法两大类,其中电阻率法提供电阻率参数,主要解决与赋水有关的构造问题(如赋水层位或断裂构造)。方法上有常规电法、电磁法,可根据地区赋水部位的不同选择适当的方法。激发极化法则利用含水层的激发极化效应进一步确定目标层位或构造的赋水性。电阻率法和激发极化法相互配合,在找水工作中相得益彰。     

融合UWB+PDR的室内定位方法改进

近年来,随着科技的进步和创新,对室内定位的研究正朝着多技术互补融合的方向发展,将导航技术与室内定位相融合成为目前的研究热点。行人航位推算(PDR)和超宽带(UWB)技术以其独特的定位优势和精确度等众多优点成为室内定位的主流技术,但PDR由于其累积误差的影响只适用于短时间内高精度室内导航需求,而超宽带在复杂环境中,时间信息可能会严重失真,导致定位信息缺失。因此,本文利用扩展卡尔曼滤波(EKF)对两者进行融合改进,以此发挥各自技术优势。试验结果表明,定位解算的终点误差最大为0.819 5 m,最小为0.144 3 m,平均误差为0.347 8 m,位置平均误差为0.475 0 m,有效提升了室内定位的精度。     

基于熵权法的组合模型在滑坡变形预测中的应用

以趋势曲线预测模型中的多项式模型和指数模型为基础,基于熵权法建立组合预测模型,就其建模理论和计算流程进行系统分析,并对某滑坡体进行预测。结果表明,文中组合方法相对于其它组合方法而言,理论简单,能够有效地反映滑坡体的变化规律,且提高了拟合预测精度,在预测工作中具有一定的参考价值。     

RTKLIB 软件静态精密单点定位精度测试与分析

介绍了精密单点定位的基本原理及常用组合量,利用日本东京海洋大学研发的开源软件RTKLIB进行静态精密单点定位数据处理,采用事后、快速、超快速三种星历及钟差产品对某IGS站单天观测值进行解算,并将处理结果和准确值对比。结果表明事后和快速产品单天解收敛曲线基本一致,最终收敛值 X、Y 、Z三个方向偏差在4 cm左右,完全满足一般精度要求的工程需要;采用超快速产品Y 方向上偏差较大,表明超快速产品对该软件的定位精度有一定的影响。     

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???GOCE??GRACE????????????????е???????????о?????GOCE??GRACE?????????λ??????????????????????λ???????????????????????????Э????????????????????GRACE?????????ITG??GRACE2010s??GOCE?????????GO_CONS_GCF_2_DIR_R1?????????????????????????????????????????????????????????????????GRACE??GOCE????????????????????????????徫?????????GOCE??GRACE????????GOCO01S??????????????????Э?????????????????????????????????m??λ?????????????     

GPS-L1/BDS-B1非重叠频率紧组合相对定位

针对短基线下GPS-L1/BDS-B1非重叠频率紧组合相对定位算法研究,详细推导了短基线下GPS-L1/BDS-B1非重叠频率紧组合相对定位的数学模型,并对GPS-L1/BDS-B1非重叠频率差分系统间偏差DISB的稳定性及事先标定DISB的方法进行了详细介绍。结果表明,与传统GPS/BDS松组合相对定位相比,采用事先标定DISB的紧组合相对定位模型能够有效提高模糊度固定的成功率,且可用卫星数量越少提升效果越明显。     

Effects of fly ash and slag content on the solidification of river-dredged sludge

Abstract

River-dredged sludge has a high water content and minimal bearing capacity and strength. Adding cement, fly ash, and slag to dredged sludge as a combined curing agent can quickly reduce its water content and improve its strength. This study experimentally investigates the solidification effectiveness of different proportions of curing agents using methods including electron microscopy, particle size analysis, water ratio limit, and water content and direct shear tests. The water content and shear strength of different combined curing agents are obtained at different ages. We find that an optimum curing agent combination exists. With increases in fly ash and slag content, test results indicate that the water content of solidified sludge first decreases and then increases, whereas the shear strength first increases and then decreases, allowing an optimal combination curing agent to be obtained. When using industrial waste residue as curing agent, it is necessary to consider the negative effects of the curing agent to better control the dosage so as to achieve better curing effect.     

小波勒山地区1颐5 万地球化学数据处理与异常评价

以小波勒山地区1:5万水系沉积物数据为对象,利用相关分析和R型聚类分析确定研究区成矿元素组合为Pb-Ag-Zn-Cu-Bi(铅多金属成矿组合)和Mo-W-Sn(钼多金属成矿组合),以线性方法构置组合变量F1(Pb-Ag-Zn-Cu-Bi)、F2(Mo-W-Sn),组合变量中的各元素权重根据该元素对主成矿元素的相关性强度来确定;运用趋势面分析方法圈定研究区两个组合变量的异常图.结果显示,根据组合变量所圈定的综合异常与研究区已知矿化地段重合性很强.结合成矿地质条件对所圈定异常进行评价.确定出具Ⅰ级找矿潜力异常区3个,Ⅱ级、Ⅲ级找矿潜力异常区各2个,为研究区下一步找矿方向的确定提供了科学的依据.     

EAST ASIA SUMMER MONSOON ONSET DATE CALCULATED FROM OBSERVED, REANALYZED AND COMBINED DAILY RAINFALL

In this paper, the East Asia summer monsoon onset date lines in East China are calculated by the definition similar to the traditional one, with the ECMWF reanalyzed 850 hPa daily wind and observed, reana-lyzed and combined daily rainfall during 1980～1993. To make the onset date line as close as possible to the previous work, the earliest onset date limits have to be applied for the regions with different latitude and the daily mean datasets have to be smoothed by space before calculation, therefore their space-resolution is reduced to about 3 longitude ×1°latitude. The results show that the multiyear mean summer monsoon onset date lines are quite similar to each other. Compared with the one from the reanalysis, the 14-year average onset date line form combination is obviously improved in the southern Sichuan Basin and the correlation between observed and combined onset date is also slightly higher over the Huaihe valley and Northeast China. Since daily rainfall combination also improved the long term daily mean and standard deviation through the pentad CMAP, if no better daily dataset is available, such a kind of daily rainfall combination can be used to get reasonable result in the Indian monsoon region without sufficient observatories or over the North Pacific without any ground observation at all in future study.     

2维矢量地图空间目标关系的组合式表达

矢量模式的地图平面空间目标是地图数据处理中常见的,其空间关系的描述与处理非常重要本文首先分析了平面地图上的尺度空间和拓扑空间的统一,以及点和直线段两两相互间的基本空间关系,并以这些基本窨绵组合为基础,试图利用组合式方法区分和描述地图空间点状、线状和面状空间目标两两相互间的空间关系,且得到各类空间关系的种数。