GPS载波相位三差观测方程的改化   总被引：3，自引：0，他引：3  

赵长胜 《测绘学报》1997,26(2):155-159

本文根据相关测量平差原理推导出改化ＧＰＳ载波相位三差观测方程的算法，使改化后的协因数呈分块对角体。这种改化算法不但顾及观测值的相关性，而且节省大量的存储单元。使采用严密平差法平差三差观测值成为一种最简单的数据处理方法之一。  相似文献   

论光电测距仪的周期误差和相位不均匀性误差     

徐前徽 《武汉大学学报(信息科学版)》1997,(2)

论述了测距仪周期误差及相位不均匀性误差的性质，分析了这些误差对距离测量的影响，给出了实验结果，提出了改进有关误差检定的建议  相似文献   

强地震地点预报方法─—交汇法     

秦保燕 《内陆地震》1997,(2)

利用小震调制比法、动态空区法、震群链式活动轨迹交汇法和短期震中迁移带交汇法这4种地震活动时空图像动态监测方法，结合震源模式中震源和其它单元之间的差异性以及各调整单元、调整层、深浅构造之间的差异性对若干震例进行研究，发现应用不同时段多个异常区边界或空区边界或条带交汇可求得未来强震的位置。交汇法使地震的预报范围大大缩小，这对防震减灾有一定的现实意义。另外，交汇法不仅具有明确的物理基础，而且具有可操作性和普适性。只要异常边界比较正确，采用的又是动态监测方法，这种预测强震位置的思路和方法还可推广到其它各种地震活动性参数和前兆场的分析中。  相似文献   

热力强迫对越赤道气流产生和维持的作用——定性分析     

王向东  廖洞贤 《气象学报》1997,55(4):484-491

从原始方程出发，应用大气运动的对称反对称性理论，就赤道地区一呈偶极子分布的反对称冷热源对越赤道气流的形成和维持作用进行了定性分析。结果表明，非绝热加热的反对称分布对越赤道气流的影响是通过诱发和维持反对称的气压场分量来实现的。即在热源上空低层形成低压，高层形成高压；在热汇上空形成相反的气压场。这样，在赤道上空高、低层就将形成与相应气压梯度方向一致的越赤道气流  相似文献   

地震层析成像在水利水电工程地质勘察中的应用   总被引：2，自引：0，他引：2  

田宗勇 《CT理论与应用研究》1997,(3)

水利水电工程地质勘察是水利水电工程建设中的基础工作。地震层析成像技术作为一种新的物探方法，通过工程中孔，碉间地质条件的探测，进而评价大坝建筑物的工程地质条件是一种有效的手段。本文介绍了乌江构皮滩水利枢纽的应用效果。  相似文献   

A ternary solid solution model for omphacite and its application to geothermobarometry of eclogites from the Middle Adula nappe (Central Alps, Switzerland)   总被引：7，自引：0，他引：7  

C. MEYRE  C. DE CAPITANI  & J. H. PARTZSCH 《Journal of Metamorphic Geology》1997,15(6):687-700

A ternary solid solution model for omphacite with the end-members jadeite (NaAlSi₂O₆), diopside (CaMgSi₂O₆) and hedenbergite (CaFeSi₂O₆) was derived from experimental data from the literature. The subregular solution model, fitted by linear programming, is best suited to omphacites with very little aegirine component in common eclogites. Applying this solution model to the calculation of equilibrium phase diagrams of eclogites from the Adula nappe (Central Alps, Switzerland) results in large stability fields for common eclogite assemblages (garnet+omphacite+quartz+H₂O±kyanite). Within this field the compositions of garnet and omphacite show very little variation. A precise determination of the peak-pressure and temperature is not possible. The occurrence of amphibole, overgrowing the peak-pressure assemblage in fresh eclogite, suggests retrograde re-equilibration, still under eclogite facies conditions. The computation of isopleths for garnet and pyroxene end-members allows the estimation of the pressure and temperature conditions of this re-equilibration event (19–21  kbar, c .  700 °C).  相似文献   

榴辉岩中铁铝榴石的测定方法研究   总被引：3，自引：1，他引：3  

黄宝贵  柳建春 《岩矿测试》1997,16(4):241-244254

对国内主要矿区铁铝石榴子石纯矿物中铁的价态规律进行了研究。证明其所含Ｆｅ均以Ｆｅ＾２＋为主，其质量分数在８３－９４，并将Ｆｅ＾２＋这特征性成分用于某地榴辉岩中铁铝榴石的间接测定，获得结果与焙烧磁化－磁选法一致且精度好，较磁化法简便，快速。  相似文献   

几个矿床技术经济评价问题探讨     

张福祯 《化工矿产地质》1997,19(1):58-62

矿床技术经济评价在地质勘查工作中占有重要地位。目前编写地质勘查报告都必须包括技术经济评价章节。但我国矿床技术经济评价的理论和方法还存在一些问题，某些评价方法和基本概念还不够统一。通过对投资回收期、净现值、总现值、销售成本、经营成本等参数的研究认为，矿床技术经济评价要进一步规范化。  相似文献   

The effects of the spinel—garnet phase transition on the formation of rifted sedimentary basins     

Tadashi Yamasaki  Masao Nakada 《Geophysical Journal International》1997,130(3):681-692

We have examined the effects of the spinel-garnet phase transition on subsidence of extensional sedimentary basins. For a constant positive Clapeyron slope ( dP/dT ), the phase boundary moves downwards in the syn-rift and upwards in the post-rift phase. For a non-linear Clapeyron curve ( dP/dT > 0 above 900°C and dP/dT < 0 below 900°C), theory predicts for the reaction of the spinel-garnet phase transition, the direction of phase boundary movement is dependent on the stretching factor, the position of the Clapeyron curve and the lithospheric thickness. A smaller syn-rift and larger post-rift subsidence are predicted for a deeper phase boundary and a thicker lithosphere. The model with a non-linear Clapeyron curve is applied to the subsidence histories of a young extensional basin (Gulf of Lion) and an old continental margin (eastern Canada). The observed syn-rift uplift and the larger post-rift subsidence can be reasonably explained by this model, where the optimum depth of the phase boundary for eastern Canada (˜90 km) is consistent with the estimate from seismic observations and is larger than that for the Gulf of Lion (˜ 50 km). The depth of the spinel-garnet phase boundary is sensitive to the composition of mantle rocks and increases with the extraction of basaltic components from the lithosphere, compatible with our result that the phase boundary is deeper for an older and thicker lithosphere. Thus the surface movement associated with the rifting for these areas may reflect the chemical evolution of the continental lithosphere.  相似文献   

410 km discontinuity sharpness and the form of the olivine α-β phase diagram: resolution of apparent seismic contradictions     

George R. Helffrich  Bernard J. Wood 《Geophysical Journal International》1996,126(2):F7-F12

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