贵州省贞丰县岩上金矿床地质特征

贞丰岩上金矿床为灰家堡金矿田的组成部分。经3年的地质勘查工作，初步查明其规模已达大型矿床，有望达成超大型金矿床，本文较详细地论述了矿床的地质特征，初步探讨了矿床成因、并指出了寻找同类型矿床的工作靶区。     

雷达无损检测技术及其在钢混构（物）件质量检测中的应用效果

本文从检测之系统性，科学性，准确性说明了雷达技术用于工程质量检测方面具有较大优越性，在扼要阐明雷达波在混凝土介质中的传播规律与特征的基础上，详细分析了雷达技术在无损检测混凝土构（物）件质量的分辨率，以2个无损检测工程实例，说明了该项技术在无损检测混凝土构（物）件质量的有效性和实用性。     

南康市潭口碘矿形成环境分析及成因探讨

本文从红盆地质背景入手，分析了碘富集成矿的水文地质构造环境、有机地球化学环境、古温度环境、电化学作用环境及水文地球学环境等因素，并在此基础上，对其成因作了初步探讨。     

浅谈施工企业的成本控制

施工企业工程成本控制的效果对该企业经济效益的好坏重要。为实施有效的成本控制，首先要确定本企业的预算成本；其次，在施工过程中，对各种工程成本进行严格控制；最后，将实际成本与预算成本作比较，分析成本控制的效果，同时提出意见和建议。因此建立本单位的人工、材料、机械消耗量定额等标准，合理确定预算成本，对于提高企业的经济效益意义重大。     

The role of diagenetic carbonate concretions in the preservation of the original sedimentary record

The Upper Cretaceous organic rich limestones and marls of the Tarfaya basin of southwest Morocco contain numerous calcite concretions, which formed during early diagenesis. Relative textural similarities are observed both in the concretions and in the host sediments. However, the biological content of the concretions is considerably higher than in the host marls and limestones. Evidence for fossil dissolution in the host marls, and the absence of concretions in some fossil-rich zones, suggest that the difference in fossil abundance between the concretions and host rock is a function of dissolution, rather than preferential precipitation in fossil-rich areas. Consequently, the carbonate concretions appear to represent the 'memory' of the sediment and allow quantification of the original biological components and are potential tools for estimating the original biological material deposited in the soft sediments.     

Stevns Klint Fish Clay (FC-1): Preparation of, and Preliminary Results for, a Candidate Reference Material

The collapse of a section of the cliff at Stevns Klint, Denmark in 1986 provided a unique opportunity to collect about 50 kg of Fish Clay representing the Cretaceous-Tertiary (K-T) boundary layer. In this paper, details of the preparation of this sample are presented, together with preliminary analytical results to support the development of this sample as a reference material, particularly for the determination of iridium and the other platinum-group elements in clays and sediments associated with K-T boundary studies and in other environmental samples collected to study the effects of automobile exhaust catalysts.     

Determination of Platinum-Group Elements and Forty Two Other Elements in Two Candidate Danish Cretaceous-Tertiary Boundary Clay Reference Materials by INAA, ENAA and RNAA

Ruthenium, rhodium, palladium, osmium, iridium and platinum (PGEs) and forty two other elements in two candidate geological Cretaceous-Tertiary boundary clay reference materials taken from the Fish Clay, Stevns Klint, Denmark, were determined by a combination of neutron activation analysis (NAA) consisting of instrumental, epithermal and radiochemical NAA with or without nickel sulfide fire assay preconcentration. The accuracy of the experimental values was assessed by the comparative analysis of the certified reference materials.     

Electron Probe Microanalysis of Environmental Samples: Preparation of Reference Materials, Correction for Particle Size Effects and Representative Results on Sediments Recovered from Snow, Power Station Fly Ash and Bone Samples

In this paper we report the results of electron probe X-ray microanalysis (EPMA) that was used to study environmental materials. The mode of preparation and certification of reference samples based on a basaltic glass matrix for environmental applications of EPMA is described. These samples were prepared containing scandium, strontium and barium (from 0.03 up to 7% m/m) and an evaluation was made of homogeneity, their stability to local heating, followed by analysis by independent methods for certification of composition. Matrix correction procedures for the EPMA technique have been developed for particles having a size commensurable with the volume of X-ray generation. An analytical equation for the size factor is proposed and two techniques for selecting optimum conditions for the analysis of environmental samples by EPMA are reported. These procedures provided satisfactory results when utilized in analysing sediments recovered from snow, coal fly ash and the bones of animals and fish, results from which can be used as indicators for evaluating the pollution level of the lower atmosphere, surface and ground water, as well as revealing pollution mechanisms.     

广西资源红辉沸石合成4A沸石的工艺研究

初步研究表明，经适当预处理，广西资源红辉沸石可作为合成4A沸石的优质源。通过反复实验，探索出了经济有效的原料预处理与4A沸石合成工艺流程及相关技术参数，既为该地红辉沸石的高层次开发利用开创了新途径，又为4A沸石合成提供了一种来源丰富的新原料。     

切磨过程中花岗石材料去除机理研究

深入理解切磨过程中花岗石材料的去除机理是优化加工设备，加工工具以及加工参数的基础。本文研究了花岗石的断口表面、锯切表面、粗磨表面以及精磨表面形貌特征，并结合切磨过程中临界载荷、单颗金刚石磨粒所承受的切削力以及比能特征，对加工表面形成机理进行了分析。研究表明，材料的去除机理与单颗磨粒的最大切削厚度直接相关。随着单颗金刚石磨粒最大切削厚度的减小、花岗石的去除方式也逐渐由脆性断裂为主转为塑性流变为主。由于不同的材料去除机制对应不同的能量消耗，可以通过调节单颗磨粒的最大切削厚度控制材料的去除方式，进而控制能量消耗。因此，均匀的磨粒出露高度对于控制切磨过程中材料的去除机理和优化加工过程具有重要意义。