埕岛复式含油气系统研究及评价

针对渤海湾南部埕岛地区的油气成藏特征和较高勘探程度的特点，对埕岛复式含油气系统（composite petroleum system)，含油气系统，亚油气系统和子系统进行了四个不同勘探级次的划分，描述，以及各含油气系统之间相互关系的讨论，从油气的生成，运移，聚集，保存和破坏有机联系的四个方面18种要素，对不同级次的系统用多级模型综合评判的数学方法，进行了综合定量评价，并在此基础上优选出下一步的有利勘探目标。     

新疆305地学断面北段的地热特征<

新疆３０５地学断面研究是国家“九五”科技攻关项目．通过地学断面,综合研究不同地质单元的地层、沉积、构造、岩石、变质作用,以及地壳、上地幔结构和地球物理场特征,研究岩石圈演化历史和动力学过程以及它们与矿产和石油资源形成及分布的关系（吴乾蕃等,１９９０）...     

闽北前汛期短时强降水与雷达回波特征

通过对1982-1996年福建北部前汛期短时强降水的时空分布及雷达回波特征进行统计分析，并对地形在暴雨中的作用进行了探讨，得出一些有意义的结论，对雷达监测暴雨及短时预报具有参考作用。     

图像配准用于fMRI运动伪影的矫正

我们把人头考虑为一个刚体模型，将描写刚体变换的6个参数（平移3个，旋转3个），用于图像配准，确定一组最佳参数，对图像进行变换，使变换的图像数据和参数图像之间方差取最小值，我们的电针刺fMRI图像经这样的三维配准处理后，消除了大部分运动伪影，取得显著的效果。     

磁法勘探在寻找玄武岩盖层下铁矿的应用

长期以来在吉林地区人们一直期盼着在火山岩分布区及玄武岩盖层下寻找铁矿床,但一直没有先例.本文重点介绍了利用地面磁测方法在玄武岩盖层下寻找铁矿床的勘探实例,从而填补了在吉林地区利用磁法勘探寻找玄武岩盖层下铁矿的空白.     

Wind tunnel investigation of the influence of surface moisture content on the entrainment and erosion of beach sand by wind using sands from tropical humid coastal southern China

Wind erosion has major impacts on dune growth, desertification, and architecture on sea coasts. The deflation threshold shear velocity is a crucial parameter in predicting erosion, and surface moisture greatly affects this threshold and thus sand stability. Wind tunnel studies have shown that reduced moisture contents decrease entrainment thresholds and increase wind erosion, but field and wind tunnel test data is lacking for tropical humid coastal areas. In this study, we investigated the influence of surface moisture contents (at 1 mm depth) on sand entrainment and erosion using tropical humid coastal sands from southern China. Shear velocities were deduced from velocity profiles above the sand. The threshold shear velocity increased linearly with increasing ln100M (M, gravimetric moisture content). The increase was steepest below a moisture content of 0.0124 (i.e., at M_1.5, the moisture content in the sand at a matric potential of − 1.5 MPa). We compared several popular models that predict threshold shear velocity of moisture sediment, and found substantial differences between their predicted results. At a surface moisture content of 0.0124, the predicted increase in the wet threshold shear velocity compared with the dry threshold shear velocity ranged from 34% to 195%. The empirical model of Chepil and Selah simulated the data well for M < 0.0062 (i.e., 0.5M_1.5), whereas Belly's empirical model simulated the data best for M > 0.0062. Wind erosion modulus increased with increasing effective wind velocity following a power function with a positive exponent at all moisture contents, but decreased with increasing surface moisture content following a power function with a negative exponent. When wind speed and moisture content varied simultaneously, wind erosion modulus was proportional to the 0.73 power of effective wind velocity, but inversely proportional to the 1.48 power of M. The increase in resistance to erosion at low moisture contents probably results from cohesive forces in the water films surrounding the sand particles. At a moisture content near M_1.5, wind erosion ceases nearly for all wind velocities that we tested.     

用天然碳酸钙除去硫酸钾肥料中游离酸

研究了天然碳酸钙的粒度对除去K2 SO4肥料中游离酸的影响 ,实验表明 ,粒径小于0 1 49mm的天然CaCO3能有效除去游离酸 ,按m(CaCO3)∶m(K2 SO4) =4∶1 0 0的比例控制天然CaCO3的加入量 ,可使K2 SO4中的游离酸酸度小于 0 50 %。     

Temporal variations of sandstorms in Minqin oasis during 1954–2000

The purpose of this present study is to investigate in detail the frequency and variation of sandstorms in the Minqin oasis. Using daily observational data from sandstorms and other meteorologic data from 1954 to 2000, the relationship between a sandstorm and meteorological parameters and human activities, which can be used for daily weather forecasting, have been illuminated. The results of the analysis show that sandstorms have a clear daily and monthly variation. Monthly mean and annual mean duration of sandstorms in the Minqin oasis coincide well with the frequencies of sandstorm occurrence.     

Grain size in sediments from Lake Sugan: a possible linkage to dust storm events at the northern margin of the Qinghai–Tibetan Plateau

Samples of surface deposits in the Lake Sugan catchment, as well as surface lake sediments, eolian materials occulted in the lake ice cover, and airborne dust were collected for grain-size analysis. The results show that the coarse fraction of the lake sediments could be transported by ambient winds and to a lesser extent by river flow in the study area. Sediment cores were retrieved from Lake Sugan in December 2000, and ²¹⁰Pb and ¹³⁷Cs dating and grain-size analyses were performed on these samples. ²¹⁰Pb ages and the volume percentage of the fraction of lake sediments >63 μm were used to reconstruct the dust storm history from 1957 to 2000. Observational data for dust storm events collected at a local meteorological station largely agrees with the reconstructed trend for the past 44 years, suggesting that lake sediments can be employed to trace the dust storm history of the northern Qinghai–Tibetan Plateau.     

The origin,historical variations,and distribution of heavy metals in the Qiongzhou Strait and nearby marine areas

We analyzed heavy metal concentrations in a number of surface sediments and cores from the Qiongzhou Strait and surrounding marine areas.The areas of high concentrations are primarily outside the eastern mouth of the Qiongzhou Strait and on the west side of the Leizhou Peninsula,whereas the areas of low concentrations are located primarily in the eastern Qiongzhou Strait.The maximum Cd,Pb and Zn concentrations in the samples collected in our study do not exceed the official standards for marine sediments,whereas the concentrations of Cr and Cu slightly exceed the standards.Correlations exist between the concentrations of Cu,Pb,Zn,Cr and Cd,and the concentrations of these metals are positively correlated with the mean particle size(φ value),indicating that the finer sediments have adsorbed greater amounts of heavy metal elements than the coarser sediments.An evaluation of the potential environmental risks demonstrates that certain indices of heavy metal pollution and environmental risks are relatively low and may be assigned low risk levels,thereby indicating that,in terms of heavy metals,the marine sedimentary environment in this region is only mildly impacted.Our analysis of the contaminant origins shows that the heavy metals in this region primarily originate in the Pearl River Estuary and that a small amount of them is derived from local runoff.The elevated heavy metal concentrations from the upper sections of the cores started 130 years ago,which indicats that heavy metals in the surface sediments are primarily due to human activities associated with industrialization.