泥河湾哺乳动物群与中国第四系下限

对泥河湾动物群(狭义)与欧洲维拉方经典动物群中属级相同的２０种哺乳动物进行形态和进化水平上的对比发现,其中有１１种(包括亚种)和晚维拉方期的 Ｏｌｉｖｏｌａ动物群的成员最接近,有４种可与中维拉方晚期的Ｓｅｎｅｚｅ动物群的成员比较,其中有２种因为仅发现于Ｓｅｎｅｚｅ,不足以说明它们一定只和泥河湾者接近。另外两种(Ｌｙｎｘ　ｓｈａｎｓｉｕｓ和Ｐｓｅｕｄｏｄａｍａｅｌｅｇａｎｓ)确实和Ｓｅｎｅｚｅ者更接近而不同于Ｏｌｉｖｏｌａａ者。有两种动物(Ｂｏｒｓｏｄｉａ　ｃｈｉｎｅｎｓｉｓ和Ｍｅｌｅｓ ｃｈｉａｉ)间接地表明泥河湾动物群可能和 Ｏｌｉｖｏｌａ更接近。还有 ３种时代意义不大。总之,对比表明泥河湾动物群(狭义)与欧洲晚维拉方早期的Ｏｌｉｖｏｌａ动物群最为接近,其年代应为１８Ｍａ左右,接近于海相Ｖｒｉｃａ剖面更新世／上新世界线(１．７９６Ｍａ)。     

中国陆地生态系统净初级生产力时空特征模拟

In this paper,we use CEVSA,a process-based model,which has been validated on regional and global scales,to explore the temporal and spatial patterns of Net Primary Productivity (NPP) and its responses to interannual Climate fluctuations in China‘‘‘‘‘‘‘‘s terrestrial ecosystems over the period 1981-1998,The estimated results suggest that ,in this study period,the averaged annual total NPP is about 3.09 Gt C/yr^-1 and average NPP is about 342 g C/m^2,The results also showed that the precipitaion was the key factor determining the spsatial distribution and temporal trends of NPP. Temporally,the total NPP exhibited a slowly increasing trend.In some ENSO years( e.g.1982,1986,1997)NPP decreased clearly compared to the previous year,but the relationship between ENSO and NPP is decreased clearly compared to the previous year,but the relationship between ENSO and NPP is complex due to the integrated effects of monsoons and regional differentiation. Spatially,the relatively high NPP occurred at the middle high latitudes,the low latitudes and the lower appeared at the middle latitudes,On national scale,precipitaion is the key conntro factor on NPP variations and there exists a weak correlation between NP and temperature ,but regional responses are greatly different.     

Modeling vp and Q on Explosion Seismology Data in NE Tibet

MODELING v_P AND Q ON EXPLOSION SEISMOLOGY DATA IN NE TIBET     

一次辽宁秋季暴雨天气的诊断分析

使用1.0°×1.0°NCEP再分析资料,对2006年10月21—22日深秋暴雨在天气形势分析的基础上,进行物理量诊断。结果表明:在有利的环境背景形势下,高位涡从对流层高层向低层伸展并形成湿位涡柱,引起气旋性环流与低涡环流叠加。对流层低层的湿斜压性增强,引起低层的锋区加强及垂直涡度发展,高空入侵干冷空气锲入底层,低层暖湿空气强迫抬升,使地面发展为气旋;高低空急流耦合产生上升气流,同时较强的补偿下沉运动激发上升运动加强,使次级环流加强,触发不稳定能量的释放;低空急流和超低空急流向辽宁输送暖湿空气及能量,对流层中低层形成湿柱并积聚高不稳定能量;中尺度气旋、高低空急流、湿位涡柱、次级环流上升支、地面高水汽含量湿区、高假相当位温出现的时间、强度、位置和结构决定了暴雨的时间和落区。     

STUDY ON THE CAUSE OF HEAVY RAIN 200506 （HR200506） IN GUANGDONG

A continuous heavy rain visited Guangdong province during June 18-25, 2005 (named Heavy Rain 200506, HR200506) and had resulted in enormous economic loss. The ageostropic Q vectors, θse,meridional circulation, computed from the NCEP reanalysis, and TBB are used to study the rainfall processes. The results indicated that a convective system moved northwards from the South China Sea (SCS)and stayed in Guangdong for several days, which was a direct cause of HR200506. The process is a result of the activity of the South China Sea summer monsoon. There were two rainbands of HR200506 in Guangdong. One laid in the north of Guangdong that produced frontal rainfall; another situated on the south of Guangdong which produced monsoon rainfall.     

胶东半岛及两侧海域尾波Q值分析

根据单次散射（Aki）模型,利用2003年至今山东台网记录的26次2．9级以上地震的数字化地震波,研究并探讨了胶东半岛及两侧海域平均尾波Q值,在1～18Hz的频率域范围内,Q值与频率的依赖关系为：胶东北部海域Qc=（313士42）,f^（0.653±0.145）,胶东内陆Qc=（319±88）f^（0.649±0.145）,黄海海域Qc=（259±60）f^（0.757±0.277）,与国内其他区域尾波Q值研究结果相比,本区域Qc为高值、对频率低依赖性区域。可能与本研究区内构造活动弱、地震活动水平低有关。     

胶东地区地壳S波衰减系数和台站场地响应的研究

根据山东数字地震台网7个地震台的118条波形资料,采用Atkinson方法（1992）,研究了胶东地区的非弹性衰减系数;采用Moya方法（2000）,研究了各台的场地响应。得到胶东地区非弹性衰减Q值随频率,的关系为Q（f）=249×f^0.596;得到的7个台站的场地响应均没有显示出明显的放大效应,这与胶东地区台站均处于岩石地基相符。     

Q3砂黄土真三轴强度变形特性研究

为了研究Q3砂黄土强度变形特性,以甘肃永靖黑方台Q3砂黄土为研究对象,利用西安理工大学研制的真三轴仪,进行了3个围压（50、100 kPa 和200 kPa）、3个b值（0、0.25和0.5）和3个含水率（5%、10%和15%）不同工况试样破坏情况的真三轴试验。试验结果发现：（1）真三轴条件下Q3砂黄土剪切破坏方式以侧胀破坏、单缝剪切破坏为主,其次少数土样发生锥形破坏、双缝剪切破坏和T型缝剪切破坏。（2）相同围压和含水率、不同中主应力比（b）的情况下,Q3砂黄土的主应力差随中主应力比增大而增大,应力-应变关系曲线为强硬化型,剪胀现象明显;中主应力比对广义剪应力和广义剪应变之间关系有一定影响,随b值增加,曲线依次增加;随b值的增加,强度降低,广义剪应力与平均球应力比（q/p）与主应变关系曲线逐渐变缓,且曲线依次降低。（3）随含水率增加,Q3砂黄土由固态向半固态转化过程中,不同中主应力比时黏聚力均出现明显降低,但内摩擦角则出现微小增加。     

吉林省一次强对流天气的中尺度分析

作者对１９９３年８月１２日发生在吉林省境内的一次龙卷风天气进行了分析。结果表明：在出现龙卷风之前和形成初期，地面风场，高空环流形势，Ｑ↑→矢量散度，对流稳定度和能量场诸方面都有表现，可提供预报信息。