云南鹤庆盆地近1Ma来的气候序列重建初探

云南鹤庆盆地近1Ma来的孢粉植物群很好地揭示了本区的环境演化过程。本文利用植物生态位知识,通过模糊数学方法对鹤庆(QH)孔孢粉序列所记录的古气候信息进行重塑,建立了近1Ma来的年均温、年降水量及年较差序列,并将本区气候演化分为4个气候旋回,32个气候期。该序列可与黄土-古土壤序列及海洋^δ18O阶段对比,但冷暖波动的幅度及降温时段持续的长短有其特色,表明本区气候既受全球气候变化的控制,又受青藏高原阶段隆升的制约;近1Ma来气温的波动幅度呈递增趋势,0.30MaB.P.尤其显著;冷、暖段间年均温的变化幅度由第一气候旋回的7℃增大到第三气候旋回的9℃(按4次平滑值计算),而样点的实际最大差值由8℃增至16℃;最强烈的降温发生在第二气候旋回中的0.45～0.14MaB.P.时间段,这与玉龙雪山冰川活动规模最大相一致;降温时年降水量及年较差值增大,证实近1Ma来,西南季风区的气候组构与东南季风区不同。     

Reconstruction of the climate in the Tianmu Mountain area, Zhejiang Province, in the last 160 years by ? 13C sequence of tree ring α-cellulose

Based on cross-dating tree rings from the Tianmu Mountain, Zhejiang Province, the tree rings α-cellulose δ 13C time series was measured. By spectrum analysis, the variation of tree-ring δ13C sequence shows a quasi periodicity of 4.4 years, which is coincident with the standard cycle of El Nino. After removing the long-term decrease trend of the δ13C variation related to atmospheric CO2 concentration, the response of the δ13C to climate elements was analyzed using meteorology data from a nearby weather station. The results suggest that there is a distinct relativity between high-frequency variation of tree ring δ 13C series and seasonal climate parameters, e.g. Temperature and precipitation, with a significant time-lag effect. In addition, the high frequency also reflects the strength change of the East Asian Monsoon. The multiple regression method was employed to reconstruct the historical climate, and to analyze the climate change and trend in the last 160 years in the northern Zhejiang Province.     

螺旋CT三维重建在骨盆骨折中的应用

目的：探讨用螺旋CT三维重建评价骨盆骨折的临床应用价值。方法：收集骨盆骨折17例，采用螺旋CT三维重建检查。结果：17例检查均取得清晰立体图像，且可消除某一骨性结构，单独观察骨盆某一组成骨的骨折情况。结论：螺旋CT三维重建在骨盆骨折的诊断、手术方案的设计及教学等有较高价值。     

Quantitative reconstruction of the lake water paleotemperature of Daihai Lake, Inner Mongolia, China and its significance in paleoclimate

By measuring Sr/Ca ratios of the ostracod shells (Limnocthere cf. inopinata) in sediments of the Daihai Lake, and combined with Sr²⁺/Ca²⁺ ratios of the lake water, this paper obtained paleosalinity of the lake water. Vaporizing experiment of the lake water in laboratory showed that there was a quantitative relationship between salinity and oxygen isotope. Using this relationship, oxygen isotope values of the paleo-lake water were calculated. By measuring the oxygen isotope of the authigenic carbonate in the lake’s sediments, and in combination with the oxygen isotope values of the paleo-lake water, the paleotemperature of the lake water was calculated. Finally, based on these proxies, the paleoclimate in the lake basin was explored.     

Mapgis在地质学中的应用

简要讨论了Mapgis的主要功能，重点阐述了Mapgis的地质制图技术、空间分析技术以及二次开发能力在地质学领域中的应用，并举例论述之。Mapgis的地质制图技术将纷繁复杂的传统地质制图过程简化，而且美观精确；空间分析技术可以将矢量数据和栅格数据综合制作出各种图形和图象文件，方便分析；地质工作者也可以运用Mapgis的二次开发能力来开发面向特定领域的系统。     

生命线地震工程的研究进展

以我国、美国和日本的研究成果为依据，综述了生命线地震工程的研究概况、研究对象、震后恢复过程优化以及抗震防灾对策的新趋势。     

Monsoonal precipitation variation in the East Asia since A.D. 1840 ——Tree-ring evidences from China and Korea

The main characteristic of the East Asian climate is the monsoon system. Plenty of studies have demonstrated that the Asian monsoon system plays a crucial role in the global climate sys- tem [1-4]. The Asian summer monsoon can be divided into two parts, t…     

Stochastic Structural Modeling

A consistent stochastic model for faults and horizons is described. The faults are represented as a parametric invertible deformation operator. The faults may truncate each other. The horizons are modeled as correlated Gaussian fields and are represented in a grid. Petrophysical variables may be modeled in a reservoir before faulting in order to describe the juxtaposition effect of the faulting. It is possible to condition the realization on petrophysics, horizons, and fault plane observations in wells in addition to seismic data. The transmissibility in the fault plane may also be included in the model. Four different methods to integrate the fault and horizon models in a common model is described. The method is illustrated on an example from a real petroleum field with 18 interpreted faults that are handled stochastically.     

基于正交投影和广义投影(POCS)算法的研究进展

目的 在于提请有关读者关注近年来关于图像重建的凸集投影算法的进展，这一重要的方法及应用。方法 主要讨论了基于正交投影和广义投影的算法。对基于正交投影的算法，并讨论了一般形式的加权松驰格式，这包含了分块格式和同时格式。并以三个定理报道有关的算法收敛性结果。结果 分别包含了相容和不相容条件和弱强收敛下的结果。对基于广义投影的算法，有关的基本概念和例子，基本算法的收敛性结果。结论 报道最近关于引入松弛系数的工作和在CT图像重建中的应用。     

井间电阻率层析成象的某些进展

用有限元法作电阻率层析成象的核心问题是Ｊａｃｏｂｉ矩阵的求取和反演成象算法的研究。本文主要论述了这两方面的最新进展，即求取Ｊａｃｏｂｉ矩阵的格林函数法，用于反演成象计算的平滑度约束反演。文中通过理论模型的成象计算，比较了两种反演算法的成象效果。