ICAP仪器主要工作条件的优化方法研究     

管奕  常平  王松君 《吉林大学学报(地球科学版)》1996,(1)

ＩＣＡＰ仪器在不同工作条件下，其测试精度与准确值差别是较大的。因此，正确进行工作条件的优化，是ＩＣＡＰ仪器分析工作的关键。本文从理论依据及实验方法两个方面探讨了实现条件优化的具体方法，以及其对于确保仪器的最佳测试状态和进一步扩大测试领域所具有的实际意义。  相似文献   

运用X射线衍射和多重峰分离程序解析高岭石的结构缺陷   总被引：4，自引：0，他引：4  

姚林波  高振敏 《矿物学报》1996,16(2):132-140

本文尝试运用Ｘ射线衍射与多重峰分离方法研究高岭石的结构缺陷，重新评价了Ｈｉｎｃｋｌｅｙ（１９６３）结晶指数（ＨＩ），运用０２，１１区域对（１１１）和（１１１）峰的分峰结果，定义了新的结晶度指数：ＣＩ＝（Ｉ１１１＋Ｉ１１１）／Ｉ１１０，它完全以衍射峰的强度进行计算，较灵敏地反映出高岭石真实的结构信息，探讨了高岭石结晶度与高峰石对称性，有序度以及与高岭石Ｐｂ／３滑移缺陷的关系，结果证明高岭石结晶度越高  相似文献   

计算样本相似性在油气预测中的应用     

朱晓军  申宁华 《世界地质》1996,15(2):87-91

介绍了计算样本相似性方法在油气预测中的应用的基本原理和技术。提出了利用参数的显著性进行参数优化和加权的方法。该方法简单、实用，并在塔北某区的应用取得了满意结果。由此证明了该方法的有效性及在综合信息预测工作中进行参数优化和加权工作的重要性。  相似文献   

地下巷道弹性位移反分析各种优化方法的探讨   总被引：16，自引：5，他引：16  

吕爱钟 《岩土力学》1996,17(2):29-34

探讨了６种最优化方法（鲍威尔法、单纯形加速法、阻尼最小二乘法、变尺度法、模式搜索法和变量轮换法）在巷道弹性位移反分析中的应用情况。从参数初始点的选择、收敛速度、收敛精度和可靠性方面评价了这６种无约束最优化方法的优劣。  相似文献   

Multiple episodes of tectonothermal processes in the Eastern Ghats granulite belt     

Santanu Kumar Bhowmik 《Journal of Earth System Science》1997,106(3):131-146

A suite of rocks from Borra Carbonate Granulite Complex (BCGC) in the Eastern Ghats granulite belt displays superposed structures and overprinted mineral assemblages that reveal multiple episodes of tectonothermal reworking of the complex under granulite facies condition. Five distinct episodes of deformation (D₁, D₂, D₃, D₄ and D₅) and four phases of metamorphism (M₁, M₂, M₃ and M₄) are recorded. The signature of the earliest tectonothermal event, D₁ is a gneissic foliation (S₁) denned by segregation of peak granulite facies mineral assemblages corresponding to prograde M₁ metamorphism. M₂ metamorphic overprint represents an episode of near-isobaric cooling of the complex under a static condition. D₂ represents an episode of ductile deformation manifested by isoclinal folding (F₂) and associated extensional structures, within a broad framework of coaxial bulk deformation. The present study reveals that D₂ took place subsequent to M₂ - Subsequent deformation, D₃, produced F₃ folds and also deformations of boudins formed during D₂. M₃, which is synchronous with F₃, represents a near isothermal decompression of the BCGC. This was followed by a weak structural readjustment (D₄), producing E-W cross folds. The latter was not, however, associated with any recognizable petrological reworking. In the terminal events, deformation (D₅) and mineral reactions (M₄) were localized along narrow intersecting shear zones. The latter acted as channelways for carbonic and still later hydrous fluid infiltration. The available thermobarometric data from BCGC and other areas of the Eastern Ghats belt reveal that reworking during M₂ and M₃ ensued in a thermally perturbed regime. The high thermal regime might also have persisted during carbonic fluid infiltration related to terminal reworking (M₄).  相似文献   

The separation of the influence of nutrients and climate on the varve time-series of baldeggersee, Switzerland   总被引：7，自引：2，他引：7  

A. F. Lotter  H. J. B. Birks 《Aquatic Sciences - Research Across Boundaries》1997,59(4):362-375

The varve data-set from a freeze-core taken in the deepest part of Baldeggersee was subjected to different multivariate statistical analyses in order to estimate the amount of variance in the varve thickness measures explicable by past climate and by the trophic state of the lake. A comparison of two different time-periods (1902 to1992 versus 1920 to 1980) revealed that the lake restoration programme since 1982 has had a significant impact on the formation of the seasonal layers. Results of the partitioning of the variance in the varve thickness measures showed that about two thirds of the variance are unexplained by a climate and trophic state model and that trophic state explains 6%, whereas climate accounts for about 28% of the variance before the effect of lake restoration had a strong impact on the varves. Among the climate parameters the amount of annual precipitation is a strong predictor for explaining the thickness of both dark layer and total couplet thickness, whereas summer precipitation is important for the thickness of the light layer.  相似文献   

地球演化中最大的两级节律     

王战 《地学前缘》1997,(Z2)

地球演化中表现出的最大两级节律为１０×１０８ａ和２×１０８ａ。每２个相邻节律可合并为一个周期，因而地球演化的最大两级周期为２０×１０８ａ和４×１０８ａ。岩石学、地层学和构造地质学方面诸多证据都说明这种划分的合理性。对于地球演化中的这类大型节律及周期性的成因机制，用笔者已提出的“地球多级驻波脉动理论模型”可以得到较合理的解释。  相似文献   

计算机内存的分类及优化管理     

范崎 《华东地质学院学报》1997,20(3):284-287

本文从计算机应用角度出发，介绍了计算机内存的基本结构及其类型内存配置对计算机工作的影响，同时讨论了如何合理计算机内存，以便充分发挥计算机的优势。  相似文献   

基于复模态的有限元模型修正算法   总被引：2，自引：0，他引：2  

陈健云  王建有 《世界地震工程》2004,20(2):12-16

针对地下结构地震响应分析中无限地基辐射阻尼问题，引入复模态情况下的具有非简化的堆积阻尼矩阵的阻尼模型，并针对具有集中质量阵的阻尼模型提出了合并与质量有关的阻尼和堆积阻尼的思想，并据此提出了一种修正此类有限元模型的两步法，首先从复模态参数中提取实模态参数，采用基于模态残余力的识别算法修正刚度矩阵，然后根据复模态参数和已得的刚度矩阵来识别阻尼模型中的刚度参与系数和质量阻尼堆积阻尼联合矩阵。  相似文献   

利用Cole-Cole模型组合得到SIP真参数的联合频谱最优化反演   总被引：2，自引：0，他引：2       下载免费PDF全文

张辉  李桐林 《地震工程学报》2004,26(2):108-112

利用Cole-Cole模型组合和稀释系数理论，可以描述测量得到的视复电阻率频谱与地下多个电性体SIP真参数之间的正演关系。本利用此正演关系进行反演试算，并比较了几种Cole-Cole模型反演方案的效果；提出固定极化目标体和围岩体的极化率同时反演其它各SIP真参数的反演方案。结果表明在固定极化率为真值时，利用此反演方案可以稳定、准确、快速地得出地下电性体SIP真参数。  相似文献