Improvements In Spaceborne Laser Altimeter Data Geolocation     

S.B. Luthcke  C.C. Carabajal  D.D. Rowlands  D.E. Pavlis 《Surveys in Geophysics》2001,22(5-6):549-559

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8—氨基喹啉—5—偶氮—对苯甲酸的合成及应用—光度法测定痕量金   总被引：3，自引：1，他引：3  

曾佐涛  徐其亨 《岩矿测试》1992,11(3):207-210

报道了新试剂8-氨基喹啉-5-偶氮-对苯甲酸(AQBA)的合成及分析应用。在阳离子表面活性剂CTMAB存在下,Au(Ⅲ)与AQBA在碱性介质中反应形成蓝绿色配合物,其最大吸收波长在608nm处,表观摩尔吸光系数为9.11×10~4L·mol~(-1)·cm(-1),Au量在0～1.8μg/ml范围内遵守比尔定律。所建立的新分析方法已应用于测定矿石及阳极泥中的痕量Au,结果满意。  相似文献   

同步设计和异步设计的最优性     

周世健  陈永奇  吴子安 《武汉大学学报(信息科学版)》1995,(4)

针对Ｇｒａｆａｒｅｎｄ的四类设计，提出了网的同步设计，论证了异步设计的相互关系，并从最优性及解集论证了同步设计和异步设计的最优性问题．得到整体最优和局部最优。最后以一算例表明结果的合理性。  相似文献   

二苯硫脲－甲基异丁酮泡塑富集液珠萃取比色法测定化探样品中的金银     

薛光 《岩矿测试》1995,(1):72-74

在１０％ＨＣＩ介质中，采用二苯硫脲（ＤＰＴＵ）－甲基异丁酮（ＭＩＢＫ）泡沫塑料富集，以金试剂液珠萃取比色法测定了化探样品中的Ａｕ和Ａｇ。方法的检出限：Ａｕ０．５×１０￣－９；Ａｓ５×１０￣－９（１０ｇ称样）。利用此方法制备了“野外快速分析箱”，可在野外简陋条件下进行现场测定。  相似文献   

海洋沉积物可溶铁测定条件的探讨     

陈荣星  王维法  何琳琳  吴金珍 《上海国土资源》1993,(4)

海洋沉积物可溶铁Fe~(3+)/Fe~(2+)比值,已被海洋地质工作者作为海洋油气化探的一项间接指标应用于东海油气化探中。这种铁的含量受提取酸的种类、浓度、样品微沸时间、放置时间等条件的影响。必须采用统一的可溶铁测定方法,只有在同一标准条件下测定的海洋沉积物可溶铁结果才有对比意义。  相似文献   

2-(2-苯并噻唑偶氮)-5-二羧甲氨基苯甲酸的合成及其应用——多元显色体系光度法测定金属材料中的镍   总被引：2，自引：0，他引：2  

樊学忠  吴斌才  刘恒椽  吴诚 《岩矿测试》1993,(1):31-34

报道了新显色剂2-(2-苯并噻唑偶氮)-5-二羧甲氨基苯甲酸(BTACB)的合成,研究了在十二烷基硫酸钠(NaLS)存在下Ni~(2+)与BTACB形成蓝紫色配合物的条件,其λ_(max)~(MR)=600nm,ε=2.79×10~4L·mol~(-1)·cm~(-1),Ni在0～0.6μg/ml范围内服从比尔定律,反应具有一定的选择性。方法已用于直接测定铝合金、纯镁及含一定量Co的钢铁中痕量Ni和经萃取分离后测定纯钴中痕量Ni。  相似文献   

染料交换荧光分光光度法测定地球化学样品中痕量铊     

卢荫庥  安荣战 《岩矿测试》1993,12(4):251-254

研究表明，在Ｈ３ＰＯ４介质中，丁基罗丹明Ｂ可从乙酸异戊酯有机相中的［Ｔ１Ｂｒ４］＾－－结晶紫缔合物中置换结晶紫而形成新的离子缔合三元荧光络合物。详细考察了该络合物形成的最佳条件、荧光特征及萃取溶剂等，制定了地球化学样品中痕量Ｔ１的荧光光度测定新方法，其检出限０．００５μｇ／ｍｌ．Ｔ１量在０－０．５μｇ／ｍｌ范围与荧光强度呈正比。测定了含Ｔ１量０．６１－１．９μｇ／ｇ的８个一级地球化学标样，结果相符  相似文献   

X射线荧光光谱法测定叶腊石中的铝铁钾钠   总被引：1，自引：0，他引：1  

郭寿兴  吴玉庆 《岩矿测试》1993,12(4):290-292

采用同一矿区已知成分含量的叶腊石配制标样系列，克服了粉末法测定叶腊石中Ａｌ２Ｏ３，Ｆｅ２Ｏ３，Ｋ２Ｏ，Ｎａ２Ｏ的矿物和粒度效应。分析结果准确度满足出口材料的检测要求。  相似文献   

A study on the combination of satellite, airborne, and terrestrial gravity data   总被引：3，自引：2，他引：1  

M. Kern  K. K. P. P. Schwarz  N. Sneeuw 《Journal of Geodesy》2003,77(3-4):217-225

Satellite gravity missions, such as CHAMP, GRACE and GOCE, and airborne gravity campaigns in areas without ground gravity will enhance the present knowledge of the Earths gravity field. Combining the new gravity information with the existing marine and ground gravity anomalies is a major task for which the mathematical tools have to be developed. In one way or another they will be based on the spectral information available for gravity data and noise. The integration of the additional gravity information from satellite and airborne campaigns with existing data has not been studied in sufficient detail and a number of open questions remain. A strategy for the combination of satellite, airborne and ground measurements is presented. It is based on ideas independently introduced by Sjöberg and Wenzel in the early 1980s and has been modified by using a quasi-deterministic approach for the determination of the weighting functions. In addition, the original approach of Sjöberg and Wenzel is extended to more than two measurement types, combining the Meissl scheme with the least-squares spectral combination. Satellite (or geopotential) harmonics, ground gravity anomalies and airborne gravity disturbances are used as measurement types, but other combinations are possible. Different error characteristics and measurement-type combinations and their impact on the final solution are studied. Using simulated data, the results show a geoid accuracy in the centimeter range for a local test area.  相似文献   

Sensitivity of GPS and GLONASS orbits with respect to resonant geopotential parameters     

D. Ineichen  G. Beutler  U. Hugentobler 《Journal of Geodesy》2003,77(7-8):478-486

The Center for Orbit Determination in Europe (CODE) has been involved in the processing of combined GPS/GLONASS data during the International GLONASS Experiment (IGEX). The resulting precise orbits were analyzed using the program SORBDT. Introducing one satellites positions as pseudo-observations, the program is capable of fitting orbital arcs through these positions using an orbit improvement procedure based on the numerical integration of the satellites orbit and its partial derivative with respect to the orbit parameters. For this study, the program was enhanced to estimate selected parameters of the Earths gravity field. The orbital periods of the GPS satellites are —in contrast to those of the GLONASS satellites – 2:1 commensurable (P _Sid:P _GPS) with the rotation period of the Earth. Therefore, resonance effects of the satellite motion with terms of the geopotential occur and they influence the estimation of these parameters. A sensitivity study of the GPS and GLONASS orbits with respect to the geopotential coefficients reveals that the correlations between different geopotential coefficients and the correlations of geopotential coefficients with other orbit parameters, in particular with solar radiation pressure parameters, are the crucial issues in this context. The estimation of the resonant geopotential terms is, in the case of GPS, hindered by correlations with the simultaneously estimated radiation pressure parameters. In the GLONASS case, arc lengths of several days allow the decorrelation of the two parameter types. The formal errors of the estimates based on the GLONASS orbits are a factor of 5 to 10 smaller for all resonant terms. AcknowledgmentsThe authors would like to thank all the organizations involved in the IGS and the IGEX campaign, in particular those operating an IGS or IGEX observation site and providing the indispensable data for precise orbit determination.  相似文献