冀东土壤地球化学基准值特征及研究意义

通过系统的土壤深层（第Ⅰ环境）取样调查，研究并给出了冀东土壤中元素系列地球化学基准值及其基本特征，包括全区及不同景观区、不同流域、不同类型土壤中元素的地球化学基准值，为区域经济发展规划和资源与环境评价提供了实用的基础地球化学信息。     

金矿石化学物相分析标准物质的研制

介绍了金矿石化学物相分析标准物质的研制工艺及技术关键，列出了单体金、连生体金、硫化物包裹金、其他矿物包裹金及总金的原始数据和定值数据。经9个实验室共同分析协作，研制的5个标准物质已被国家质量监督检验检疫总局批准为国家一级标准物质。该系列标准物质主要用于金矿石化学物相分析质量监控、分析方法评价等。     

New Thorium Isotope Ratio Measurements in Silicate Reference Materials: A‐THO,AGV‐2, BCR‐2, BE‐N,BHVO‐2 and BIR‐1

A two‐step Th isolation protocol, involving micro‐columns of TRU‐Spec extraction chromatography material and AG1 resin, was evaluated. The MC‐ICP‐MS procedure included ²³²Th tailing characterisation and correction, and calibrator bracketing using an in‐house standard solution (ThS1) to correct for instrumental mass bias and Faraday cup to secondary electron multiplier relative gain. Repeated analyses of reference solutions (UCSC Th ‘A’, WUN, OU Th ‘U’, IRMM‐36) were consistent with published data. Six reference materials (A‐THO, BCR‐2, AGV‐2, BHVO‐2, BE‐N and BIR‐1) were processed. The average ²³⁰Th/²³²Th values obtained for these samples are in excellent agreement with published data. In addition, we report the first ²³⁰Th/²³²Th values for BE‐N and BIR‐1. The intermediate precisions for rock samples ranged from ± 0.24 to ± 0.49% (2 RSD) and were similar to those achieved for synthetic solutions, thereby supporting the overall validity of the chemical separation, data acquisition and reduction procedures. Counting statistics on the ²³⁰Th isotope was the most significant source of uncertainty. The intermediate precision of the mean ²³⁰Th/²³²Th for the Th‐depleted BIR‐1 (5.64 × 10^?6 ± 0.27%, 2 RSD) is in the range of the analyses of other reference materials analysed in this study.     

竖向不规则框架结构连续性倒塌分析

国内外学者利用非线性静力方法进行结构倒塌分析时,研究对象主要集中在规则的结构形式,而针对大量出现的造型独特的竖向不规则建筑的倒塌研究还相对较少。本文基于拆除构件法,利用SAP2000结构有限元软件,对竖向不规则多层框架结构进行了基于非线性静力Pushdown方法的抗连续性倒塌研究。分别研究了拆除同一结构中不同部位构件、不同层数塔楼结构中相同部位构件后剩余结构的承载力变化情况,研究结果表明：拆除竖向承重柱后的剩余结构承载力,随着上部塔楼层数的增加以及拆柱位置的上升而出现不同程度的降低;加强裙楼顶部水平向承重构件,可以使塔楼底部构件破坏后的剩余结构更好地发挥悬链线机制,并防止剩余结构发生无明显征兆的连续性倒塌。     

An Evaluation of Methods for the Chemical Decomposition of Geological Materials for Trace Element Determination using ICP-MS

Complete dissolution is essential to obtain accurate analytical results using ICP-MS. In this study, decomposition techniques (i.e. acid digestions using Savillex Teflon vials, a high pressure digestion system and microwave oven, a combined lithium tetraborate fusion - HF/HNO3 acid decomposition and sodium peroxide sinter) for the total dissolution of different types of geological reference materials have been investigated. Savillex Teflon vial HF/HNO3 digestion is effective for basaltic samples. The high pressure HF/HClO4 digestion (PicoTrace TC-805 digestion system, Bovenden, Germany) allows dissolution of basalts and ironstones. Granites and magnetite-rich samples can be dissolved using a high pressure HF/H₂SO₄ method. Geological samples cannot be effectively attacked by microwave acid digestion. A combined lithium tetraborate fusion - HF/HNO3 acid digestion method allows complete dissolution of many different types of geological materials; however, this method precludes the determination of volatile elements due to the high fusion temperature (1000 °C). A sodium peroxide sinter method at 480 °C has the potential for the rapid determination of Y, Sc and REE in different types of geological materials. However, the lack of ultra-pure reagents precludes the use of lithium tetraborate fusion and sodium peroxide sinter methods for the measurement of geological samples with low trace element abundances.     

Determination of Chlorine in Nine Rock Reference Materials by Isotope Dilution Mass Spectrometry

A procedure for the determination of chlorine by the isotope dilution technique (ID) using negative thermal ionisation mass spectrometry (N-TIMS) is described. Silicate samples of about 10 mg were spiked and decomposed with hydrofluoric acid, and chlorine was isolated by precipitation of silver chloride after neutralisation with Ca(OH)₂. The ammonical solution of AgCl was then subjected to N-TIMS. Replicate analyses of rock reference materials, typically of JB-1 and JR-1, demonstrated the high quality of the analyses (precision for Cl was ± 1-2%). We present here the most precise data sets of chlorine concentrations in nine igneous rock reference materials, three basalts (JB-1, JB-2, JB-3), two andesites (JA-3, AGV-1), two rhyolites (JR-1, JR-2) and two granodiorites (JG-3, GSP-1). The chlorine concentrations found ranged from 152 μg g-1 in AGV-1 to 1008 μg g^-1 in JR-1. Our results presented here are partly (but not completely) in agreement with recommended values, where they are available. The N-TIMS ID technique can thus be used as a means of determining low chlorine contents in silicate materials to high precision.     

CORS系统稳定性监测数据处理与分析研究

提出了一套完整的CORS系统基准网稳定性分析的方法和流程,并通过武汉市CORS系统基准网数据进行了验证。结果表明,该方法可行,CORS系统连续高精度观测数据为地理空间框架的形变分析提供了先进、高效的手段和方法。     

从地理空间数据质量到地理空间信息服务质量

首先,阐述了从地理空间数据质量研究推进到地理空间信息服务质量研究的重要性与必要性;其次,分析了质量、服务的定义及内涵;最后,提出了地理空间信息服务质量的参考模型,该模型涵盖了地理空间信息服务质量的各种基本概念、角色与活动。     

基因表达式程序设计的卫星遥感影像恢复

提出了一种基于基因表达式程序设计的卫星影像恢复模型。借助一张局部参考影像,该模型首先利用基因表达式程序设计挖掘出参考影像与退化影像的数学函数关系,然后利用该函数关系对退化影像进行恢复重建,进而达到利用局部参考影像对全局退化影像进行改善和恢复的目的。实验结果表明,该方法有效并具有一定的实用价值。     

滑动窗口混合加权法磁异常保真去噪研究

实测磁异常通常含有明显的噪声干扰,常用的滑动窗口平均滤波法虽然有明显的去噪效果,但对有意义的异常信号也会造成明显的幅值和宽度上的失真.S-G平滑滤波法具有异常形态保真的优点,但在平稳区的去噪效果欠佳.本文提出异常评价识别具体方法,并据此将平均法与S-G法动态加权融合,从而实现了既能对异常区进行信号的保护,又能在全区达到有效去噪的目的,为磁异常的有效去噪形成简单而有效的方法.