电感耦合等离子体原子发射光谱法测定锆钛砂矿中锆钛铁钍铪

为了满足区域资源的调查和研究需要, 提出了过氧化钠熔融-电感耦合等离子体原子发射光谱法(ICP-AES)同时测定锆钛砂矿中锆、钛、铁、钍和铪5种元素的分析方法。样品用过氧化钠熔融, 水提取熔融物, 过滤后沉淀用硝酸溶解, ICP-AES测定。由于过氧化钠与样品的熔融物经水提取和过滤后, 大量的钠和大部分干扰元素进入滤液中, 而分析元素留在沉淀中, 有效消除了高盐效应对测定的影响。方法的检出限为0.010 mg/L(锆)、0.011 mg/L(钛)、0.005 1 mg/L(铁)、0.082 mg/L(钍)、0.018 mg/L(铪), 样品中各元素测定结果的相对标准偏差(n=5)小于5% , 锆钛砂矿标准样品中各元素的测定值与其认定值一致。     

印尼某海滨砂铁矿选矿试验研究

为了给国内某企业开发印尼某海滨砂铁矿资源提供技术依据,采用磨矿-弱磁选流程和预选抛尾-分级-磨矿-弱磁选流程对该矿矿样进行了选矿试验,前者获得了Fe品位为55.31%、TiO₂含量为9.32%、Fe回收率为87.29%的铁精矿,后者获得了Fe品位为54.62%、TiO₂含量为9.49%、Fe回收率为88.35%的铁精矿。两流程相比,铁精矿指标相近,但后者可减少占原矿37.73%的磨矿量和占原矿7.16%的末段磁选量,故将其作为推荐流程。     

海南岛东部滨海砂矿资源分布特征(增刊)

为调查海南岛东部滨海砂矿资源,在海南岛东部滨海海区域进行了单道地震测量和地质钻探工作,单道地震剖面显示在陵水、万宁、琼海及文昌东部浅海海域地层沉积层厚度随海水深度增大而增厚,剖面上最大沉积厚度大于100m,根据钻孔岩心分析,海南岛东部滨海砂矿含有丰富稀有元素和贵重金属,锆、钛砂资源较丰富,品位较高,是一种潜在的矿产资源,钻孔岩心样品测试分析表明,海南岛东部滨海海底除锆石、钛铁矿外,白钛石、金红石等也有较高品位,是海南岛东部海区海底优势矿种,并新发现2处金红石、锆英石砂矿富集区域。     

Predictions for fatigue crack growth life of cracked pipes and pipe welds using RMS SIF approach and experimental validation

The objective of the present study is to understand the fatigue crack growth behavior in austenitic stainless steel pipes and pipe welds by carrying out analysis/predictions and experiments. The Paris law has been used for the prediction of fatigue crack growth life. To carry out the analysis, Paris constants have been determined for pipe (base) and pipe weld materials by using Compact Tension (CT) specimens machined from the actual pipe/pipe weld. Analyses have been carried out to predict the fatigue crack growth life of the austenitic stainless steel pipes/pipes welds having part through cracks on the outer surface. In the analyses, Stress Intensity Factors (K) have been evaluated through two different schemes. The first scheme considers the ‘K’ evaluations at two points of the crack front i.e. maximum crack depth and crack tip at the outer surface. The second scheme accounts for the area averaged root mean square stress intensity factor (K_RMS) at deepest and surface points. Crack growth and the crack shape with loading cycles have been evaluated. In order to validate the analytical procedure/results, experiments have been carried out on full scale pipe and pipe welds with part through circumferential crack. Fatigue crack growth life evaluated using both schemes have been compared with experimental results. Use of stress intensity factor (K_RMS) evaluated using second scheme gives better fatigue crack growth life prediction compared to that of first scheme. Fatigue crack growth in pipe weld (Gas Tungsten Arc Welding) can be predicted well using Paris constants of base material but prediction is non-conservative for pipe weld (Shielded Metal Arc Welding). Further, predictions using fatigue crack growth rate curve of ASME produces conservative results for pipe and GTAW pipe welds and comparable results for SMAW pipe welds.     

含钒钛海滨砂矿的合理利用途径

在对目前已开发的钒钛磁铁矿综合利用流程进行全面分析的基础上.就含钒钛海滨砂矿的合理利用途径进行了讨论,认为采用预还原-电炉法处理海滨砂矿分选所得的钒钛磁铁精矿是比较合理的,并就具体的工艺选择提出了建议.     

多年冻土砂金矿分层剥离自然解冻法解冻周期确定

多年冻土砂金矿的开采,解冻是关键,而解冻周期的确定是砂金开采的重要课题之一,我国普遍采用分层剥离自然解冻法解冻矿体,但对其解冻周期的确定研究尚不完善,一般采用经验法确定解冻周期,采用这一方法缺少科学依据,文中推荐采用斯蒂苏公式计算解冻周期并结合实例说明如何应用这一公式确定解冻周期。     

Recombinant Landscapes in the American City

How are urban actors, such as landscape designers, community groups, developers and local politicians, actively restructuring their environments to meet the challenges of the American city in the new global context? Grahame Shane outlines the approaches to landscape that have been emerging since the mid-20th century and are set to recombine urban assemblages whether they are located in historic city centres, postindustrial waterfronts or suburban sprawl. Copyright © 2007 John Wiley & Sons, Ltd.     

颗粒碳酸盐岩测井相及其对滩相储层的指示意义

碳酸盐岩滩相储层具有极强的非均质性,储层的优劣严格受沉积微相和微古地貌起伏所控制,而测井相的变化能很好地反映由台地内次一级古地形起伏控制的沉积分异作用。以四川盆地中部磨溪气田为例,分析了下三叠统嘉陵江组嘉二2亚段A层的测井相类型、特征及测井相分布,指出自然伽玛曲线形态呈箱型、钟型+漏斗型的地区是强水动力条件下滩核微相的测井响应,反映古地形相对高处,储层发育好;而曲线形态呈指型和尖峰型的地区则为滩间洼地或滩缘微相的响应特征,反映古地貌相对较低,储层发育差,认为颗粒碳酸盐岩测井相研究是准确解释标志层岩性的重要手段,而解释成果则是沉积微相精细描述和沉积期微地貌 恢复研究的必要依据,也是碳酸盐岩隐蔽滩相薄储层预测和储层非均质性研究的基础。     

Distinguished teaching in biopsychology: Frank A. Beach.

Presents the citation and biography for Frank A. Beach, the 1985 recipient of the American Psychological Association's Award for Distinguished Teaching in Biopsychology. Beach was honored for contributions made through his monographs on hormones and behavior and on human sexuality to the founding and development of these fields of study and to the education of generations of psychologists. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

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四川盆地广泛分布着碳酸盐岩，蕴藏着丰富的油气资源。本文试图通过总结前人有关四川盆地下二叠统的研究成果，寻找下二叠统潜在的、有利的勘探领域。大量的实钻、野外调查资料及研究成果表明，下二叠统主要的储集岩为粗结构、质纯的粒屑碳酸盐岩，而这种储集岩主要形成于滩相沉积，即下二叠统有利的储集相为滩相，它控制着下二叠统的储层发育。通过沉积相研究，认为下二叠统滩相主要分布于川西－川南的沿盆地边缘的弧形地带。由于川南地区（泸州－宜宾一带）下二叠统的勘探程度已较高，故认为今后下二叠统的重点勘探领域应在川西前陆盆地地区。