放射性地层学的探讨

探讨了放射性地层的划分原则和单位、界线、放射性地层对比、放射性异常的概念以及放射性地层工作程序和研究方法,提出在区调中开展放射性地层研究的建议。     

激电测量在寻找硅质角砾岩型铀矿中的应用

对硅质角砾岩型的320矿床的典型剖面进行综合物化探研究结果表明,这类矿床的隐伏铀矿体具有高值大范围的极化率(η_(?))异常,激电测深可圈定矿体的埋深、产状、规模等特征,激电法是寻找这类隐伏铀矿的高灵敏度方法。在这类矿体的地表还有γ,Po,He,Cu,Mo等物化探异常,根据这些综合异常可推断激电异常是否反映了隐伏铀矿体,大大提高物化探综合找矿的能力。对320矿区外围同类异常点进行综合物化探研究的结果,在WBC地区发现了大范围高值激电异常及其它综合物化探异常,而且地质条件、区域航测、重力、水化学、分散流等异常特征也与320矿区相似,预测为隐伏铀矿远景区。     

Multilevel optimization of surface coal mine truck and shovel fleets

Summary Optimization algorithms are developed to improve the selection of truck and shovel fleets for suface mine operations. These are based on performance estimation models developed by Fluor Utah (1977) and graphical display algorithms and other software within the SEAMPLAN system developed at Montana State University. The advantages and disadvantages of the method are considered.     

贵州西南部灰家堡金矿田勘查研究进展与深部找矿预测

贵州西南部灰家堡金矿田位于国家级南盘江-右江成矿区带北部,探明金资源量370 t,近东西向灰家堡背斜为矿田控矿构造,矿体呈层状似层状产于背斜轴线300■1 000 m范围,埋深0■1 400 m,是理论找矿的典型范例。为燕山期成矿。构造地球化学弱信息指示了深部隐伏矿存在的可能,地球物理判别了深部构造形态,为深部工程验证提供间接依据;矿田内局部地段矿体未圈边、深部断裂发现厚大矿体;根据找矿预测模型,开展深部找矿预测,仍有较好找矿潜力。     

堤坝隐患探测技术研究进展

我国堤防数量众多,质量参差不齐,对人民生命财产安全造成了很大威胁。利用各种物理探测手段查找堤防隐患对保证防洪工程安全具有重要意义。本文简要总结了我国堤防隐患无损探测技术概况并对近年来在此领域内取得的主要进展进行了回顾与总结。文章最后对堤防无损探测技术今后的发展进行了展望。     

Poverty and Disasters in the United States: A Review of Recent Sociological Findings

This article synthesizes the literature on poverty and disasters in the United States and presents the results from a wide range of studies conducted over the past twenty years. The findings are organized into eight categories based on the stages of a disaster event. The review illustrates how people of different socioeconomic statuses perceive, prepare for, and respond to natural hazard risks, how low-income populations may be differentially impacted, both physically and psychologically, and how disaster effects vary by social class during the periods of emergency response, recovery, and reconstruction. The literature illustrates that the poor in the United States are more vulnerable to natural disasters due to such factors as place and type of residence, building construction, and social exclusion. The results have important implications for social equity and recommendations for future research and policy implementation are offered.     

中国国际河流研究进展

1IntroductionThe increasing momentum of economic globalization and regional geopolitical cooperation no longer stand as the major drivers of a new world order. Resource and environmental diplomacy are now regarded as new elements establishing future international patterns. Transboundary resources and environmental issues in international river basins have attracted increasing global concern and professional attention. The impact of such issues penetrates into national security, international e…     

Sonic anemometers in aeolian sediment transport research

Fast-response wind and turbulence instruments, including sonic anemometers, are used more and more in aeolian sediment transport research. These instruments give information on mean wind, but also on fluctuations and turbulent statistics, such as the uw covariance, which is a direct measure of Reynolds' stress (RS) and friction velocity. This paper discusses the interpretation of sonic anemometer data, the transformations needed to get proper results and turbulence spectra, and how they are influenced by instrument size, sampling frequency, and measurement height.Turbulence spectra characterize how much the different frequencies in the turbulent signals contribute to the variance of wind speed, or to the covariance of horizontal and vertical wind speed. They are important in determining the measurement strategy when working with fast-response instruments, such as sonic anemometers, and are useful for interpreting the measurement results. Choices on the type of sonic anemometer, observation height, sampling period, sampling frequency, and filtering can be made on the basis of expected high and low-frequency losses in turbulent signals, which are affected by those variables, as well as wind speed and atmospheric stability.Friction velocity and RS, important variables in aeolian sediment transport research, are very sensitive to tilt or slope errors. During a field experiment, the slope sensitivity of the RS was established as 9% per degree of slope, which is 1.5 times the value reported in literature on the basis of theoretical considerations. An important reason for the difference probably is the large influence of streamline curvature on turbulence statistics and thereby on the slope sensitivity of the RS. An error of 9% per degree of slope in the RS will translate into an error of approximately 4% per degree of slope in the calculated friction velocity.Space–time correlation of the horizontal wind speed is much larger than that of the vertical wind speed and the instantaneous RS. This largely explains why, in previous studies, a poor correlation was found between instantaneous RS measured at 3 m height and saltation flux near the surface, whereas the correlation between wind speed at some height and saltation flux was much better. Therefore, the poor correlation between RS away from the surface and saltation flux does not contradict that saltation flux is caused by RS.     

Embodiment and sexuality in cross-cultural research

In this paper, I reflect on the impact that my embodiment and the sexed subject positions that I took up at various moments in the field had on my research on cross-cultural sexual encounters between Thai men and tourist women. I explore the negotiation of sexed subjectivity and positionality and the implications that these negotiations had for research ethics in the project. The issue of research ethics is bound up in the conceptualisation of power relationships between researcher and researched. Here I argue that power is not necessarily already distributed between researcher and researched; rather, that power can shift in different contexts.     

莫来石的研究进展

叙述莫来石的开发利用现状以及采取的相应深加工技术，重点介绍了莫来石的研究现状及应用。同时对莫来石的进一步研究进行了分析。