内蒙古大青山的新生代剥蚀和隆起

内蒙古大青山及其毗邻的呼和浩特断陷盆地是研究剥蚀和地壳均衡隆起的理想地区。本文提供了大青山新生代等高峰顶面和晚第四纪河流阶地拱曲变形的证据 ;依据呼和浩特盆地的地震探测获得的沉积厚度 ,计算出大青山的剥蚀和地壳均衡隆起量 ;提出地壳均衡隆起是大青山晚第三纪以来主要的区域变形机制 ;指出由於地壳均衡隆起 ,剥蚀作用最终只是使大青山高度略微降低 ;同时复原了大青山新生代景观演化历史。本文还讨论了剥蚀和地壳均衡隆起之间的耦合关系以及断裂作用在其中的地位 ,认为大青山新生代景观演化是在剥蚀去荷失去重力平衡和均衡隆起恢复重力平衡的长期自身耦合作用中进行的 ,在此过程中断层的下降盘由主动盘变成被动盘     

Research on the Tectonic Environment and Seismogenic Mechanism of the 1927 Gulang Great Earthquake with M=8.0

In this paper, we discussed the seismotectonic environment of the deep-seated and shallowcrust and seismological and geological model caused the 1927 Gulang great earthquake, basedon the recent research concerning about the active fault, surface rupture, fault planesolution, seismic activity, as well as the deep geophysical exploration data analysis in theepicentral area.The result shows that the 1927 Gulang great earthquake was caused by NE-SW-strikingcompressional thrusting. It was a latest event occurred in the reverse fault-folding belt thatdeveloped along the intracrustal decollement.     

Characteristics of Large Earthquake Recurrence and Determination of Average Recurrence Interval Value

Paleoearthquakes in the Yanqing-Huailai basin and on the Haiyuan fault are studied in detail.The result indicates that the recurrence behavior of large earthquakes is of a wide variety.Characteristic earthquakes show the behavior characteristics of the activity of most faults,butthey are of different grades,the recurrence interval of large earthquakes is of staged nature,and the interaction between faults has effects on the recurrence sequence of large earthquakes.Thus,when the recurrence behavior of large earthquakes is staged in time or when thegradation of characteristic earthquakes has led to a sharp difference in recurrence intervalbetween paleoearthquakes of different intensities,for estimating the large earthquake risk bythe deterministic method and time-dependent probabilistic method,it is necessary to calculatethe recurrence interval value separately for each specific stage or grade in order that theaverage recurrence interval values of different stages can be determined.     

多模态医学图象的SVD-ICP配准方法

多模态医学图象的配准在医学诊断和治疗计划中起着重要的作用。本文提出一种基于轮廓特征的迭代最近点（ＳＶＤ－ＩＣＰ）的配准方法。这种方法结合了ＳＶＤ最优化解析方法和迭代搜索的优点来解决图象轮廓点的匹配问题,适用于不同模态医学图象之间的配准。我们关于ＣＴ－ＭＲＩ和ＰＥＴ－ＭＲＩ二维图象的配准实验证明了该方法的有效性。     

黄土坡滑坡的发育历史: 坠覆-滑坡-改造

长江三峡库区巴东新县城黄土坡是否为古滑坡、滑坡的范围有多大、新滑坡与古滑坡的关系如何等, 还存在着不同认识.基于大量的野外观察资料, 提出了坠覆-滑坡-改造多阶段变形、失稳的斜坡演化模式.认为黄土坡在滑坡以前经历了长期的坠覆作用, 坠覆包括了倾倒和深层蠕变两种基本的斜坡变形型式; 坠覆的基础上发生了滑坡, 造成了台阶状地貌、构造面线与基岩不协调及滑动角砾岩带等现象; 滑坡形成后受水文、地貌等条件的影响, 长期经历着小规模滑坡的叠加改造, 1995年发生的两次滑坡仍是进一步改造的结果.黄土坡坠覆-滑坡-改造这一有机联系的岩质斜坡变形过程的建立, 使得关于黄土坡的一些重大问题有了比较明确的认识, 这也为构造学解决斜坡研究中的一些问题提供了一个典范.      

拉压性能不同材料圆环极限压力分析及应用

应用双剪应力强度理论对拉压异性材料制成的圆环进行了弹塑性应力分析, 得到了弹性极限内压力、弹塑性极限内压力与拉压比的关系式, 并举例说明了其在岩土材料抗拉强度测试中的应用。     

高精度预应力对穿锚索保直工艺初探

以三峡永久船闸预应力锚索工程施工实践为例 ,详细分析锚索孔倾斜产生的地质条件、工艺因素 ,提出防止产生孔斜的措施 ,并详细介绍钻具保直组合系统。     

广元市金洞乡Ⅱ号滑坡复活成因机制探讨

在对广元市金洞乡 号滑坡的工程地质、地质环境进行详细研究和对滑坡复活变形进行监测的基础上 ,论证金洞乡 号滑坡复活变形与采金、建镇平场、库水消涨等人类工程活动之间的相互关系及其复活机制     

Emergence of sheared magnetic flux tubes in an active region observed with the SVST and TRACE

The active region NOAA AR 8331 was a target of an international ground-based observational campaign in the Canaries and coordinated with space instruments (TRACE and Yohkoh). We focus our study on observations obtained with the SVST at LaPalma, and with TRACE. On 10 September 1998, arch-filament systems were observed with high spatial and temporal resolution, from the lower to the upper atmosphere of the Sun, during five hours. Flux tubes emerged with increasing shear, which apparently led to energy release and heating in the overlying corona. A model for filament formation by the emergence of U-shaped loops from the subphotosphere, as proposed by Rust and Kumar (1994), is supported by the present observations. The coronal response to these events is visualized by rising, medium-scale loop brightenings. The low-lying X-ray loops show short-lived, bright knots which are thought to result from interaction between different loop systems.