PRELIMINARY DISCUSSION ON METALLOGENESIS OF LANCANGJIANG RIVER TRANSITIONAL FIELD TECTONIC ZONE IN WESTERN YUNNAN

1 Concept of transitional field tectono-metallogenesis On the basis of preliminary systemical elucidating the concept of crustobody, while making ahistoristic-dynamic integrated metallogenetic analysis of the relation of the mantle creep-flow andgeothermal energy coacervation-diffusion alternation as the deep dynamic source and mechanismto the evolution and movement of crustobodies (including intrabody and interbody), Chen Guodaproposed the technical terms of transitional field tectono-met…     

饮用水中三种痕量卤代甲烷的超声辐照处理

以饮用水中痕量氯仿、四氯化碳和一溴二氯甲烷3种卤代甲烷为目标化合物,采用超声辐照技术研究它们在不同条件下的去除效果.结果表明,3种卤代甲烷的超声降解遵循准一级反应动力学模型,超声辐照1 h后的去除效率与速率常数均按氯仿、一溴二氯甲烷、四氯化碳的顺序递增,分子的疏水性对3种卤代甲烷的降解效率有显著影响.超声强度越大,饮用水中的痕量卤代甲烷去除效果越好.超声辐照后自来水的pH值降低很小,进一步论证超声技术应用于饮用水处理的可行性.在敞口容器中,超声波辐照对水样中的卤代甲烷同时存在着降解与吹脱作用,根据超声空化理论,提出可能的超声吹脱机理.     

北京大气气溶胶中硫氧稳定同位素组成研究

使用MAT-253同位素质谱仪对北京大气气溶胶中多硫同位素(32S,33S,34S和36S)与氧同位素(16O和18O)组成特征进行分析.北京大气气溶胶中δ34S变化范围为1.68‰~12.57‰,平均值为5.86‰,表明该地区主要硫源与燃煤排放相关;δ18O变化范围为-5.29‰~9.02‰,平均值为5.17‰,说明气溶胶中的硫酸盐以二次硫酸盐为主.在2008年7和8月,大气SO2主要以酸性条件下H2O2的异相氧化为主,而在9和10月,大气SO2同时存在酸性条件下H2O2异相氧化和过量O2下Fe3+催化氧化.北京大气气溶胶存在显著的硫同位素非质量分馏效应,通过对△33S与CAPE相关性分析,发现其形成机制不仅与平流层SO2的光化学反应有关,还可能与热化学反应机制关联.     

太湖大气气溶胶中硫稳定同位素组成分析

用 MAT-253同位素质谱仪对太湖大气气溶胶中的硫稳定同位素组成特征进行了分析.结果显示,太湖大气气溶胶中δ34S 数值变化范围为4.46‰~9.87‰,表明该地区大气气溶胶的主要硫源与当地燃煤排放直接相关.Δ33S 绝对值普遍大于0.1‰,说明太湖大气气溶胶中存在显著的硫稳定同位素非质量分馏效应;基于正Δ33S 和负Δ36S 的关联,揭示太湖气溶胶中硫稳定同位素的分馏异常主要与平流层 SO2发生的光化学反应有关,该科学问题迫切需要做进一步系统深入的研究.     

Spectral Analysis of the Flare of 1998 November 11 based on the Multi—cloud Model

1 INTRODUCTIONAlthough coronal mass ejection (CME) as a representation of solar eruptive events has be-come a most popular subject in solar physics since the rapid development of space observations,the study of solar flares remains attractive. Modern space and ground-based observations showthat solar flares are loop phenomena, in general, they are composed of several loops forminga loop system. There are two kinds of loops: X-ray loops and post-flare loops; the former arehot loops observ…     

Experimental research on the seismic behavior of CSPSWs connected to frame beams

The seismic performance of composite steel plate shear walls (CSPSWs) that consist of a steel plate shear wall (SPSW) with reinforced concrete (RC) panels attached to one or both sides by means of bolts or connectors is experimentally studied. The shear wall is connected to the frame beams but not to the columns. This arrangement restrains the possible out-of-plane buckling of the thin-walled steel plate, thus significantly increasing the bearing capacity and ductility of the overall wall, and prevents the premature overall or local buckling failure of the frame columns. From a practical viewpoint, these solutions can provide open space in a floor as this type of composite shear walls with a relatively small aspect ratio can be placed parallel along a bay. In this study, four CSPSWs and one SPSW were tested and the results showed that both CSPSWs and SPSW possessed good ductility. For SPSW alone, the buckling appeared and resulted in a decrease of bearing capacity and energy dissipation capacity. In addition, welding stiffeners at corners were shown to be an effective way to increase the energy dissipation capacity of CSPSWs.     

Sensitivity of Cyclone Tracks to the Initial Moisture Distribution:A Moist Potential Vorticity Perspective

1. IntroductionExtratropical cyclones are an important class ofsynoptic-scale weather systems. These systems playimportant roles not only in the long-term balances ofenergy, momentum, and water vapor in the climatesystem, but also in the regional weather …     

Connected Degree Evaluation on Watershed Topography Factors of Man-made Debris Flow Gully in Semiarid Area

在神府—东胜矿区人为泥石流沟道广泛野外调查的基础上,选取了43条典型泥石流样沟,在1∶10 000地形图及卫片上进行了形态要素量测,应用流域地貌分析原理,对43条样沟各形态要素进行了剖析及关联度评价,并进行了泥石流沟道发育阶段的信息维分析,所得结论为半干旱地区的人为泥石流沟道地势比沿程变化奇特,以形成区比降最大,区别于自然泥石流沟道;沟道分区面积比以汇水区面积最大,明显区别于湿润地区;流域形状以扇形为主,沟道给养面积较大,崎岖系数不甚太大是半干旱地区人为泥石流沟道的独特之处,泥石流沟道发育以幼、青年期为主,最后得出了以沟道比降为主因子的各形态要素的主次排序。     

硫稳定同位素对环境污染物的示踪

硫作为大气和水体中污染物的主要成分,确定其来源对于含硫污染物的控制有着重要意义。利用硫稳定同位素组成（δ34S）示踪污染物的来源作为一较准确方便的方法成为研究的热点。论述了利用硫稳定同位素追溯水体及大气环境中含硫物质的来源研究&并对其研究前景进行展望。     

磨细ＣＦＢＣ粉煤灰的火山灰效应比

将ＣＦＢＣ（循环流化床燃烧技术）粉煤灰按粉磨时间处理成若干个粒度分布不同的试样,然后分别以１５％、３０％及５０％的磨细ＣＦＢＣ粉煤灰取代水泥进行胶砂强度试验,再计算磨细ＣＦＢＣ粉煤灰的火山灰效应比（ＰＥＲ）,利用ＰＥＲ指标分析磨细ＣＦＢＣ粉煤灰对水泥胶砂强度的贡献．结果表明：随着养护时间的延长,磨细ＣＦＢＣ粉煤灰的ＰＥＲ值逐渐增加;随着粉磨时间的延长,磨细ＣＦＢＣ粉煤灰的ＰＥＲ值呈现出先增加后减小的趋势变化;磨细ＣＦＢＣ粉煤灰的ＰＥＲ值主要受其需水量比的影响．磨细ＣＦＢＣ粉煤灰对水泥胶砂强度的贡献随着养护时间的延长而增大,在磨细ＣＦＢＣ粉煤灰的需水量比最小的情况下,其对水泥胶砂强度的贡献最大．