由相叠低分辨投影数据重建高分辨图像

本文提出了由平行的相叠低分辨投影数据重建高分辨图像的两个新算法，即虚拟探测器法和直接重建法，并给出和分析了数值模拟结果。     

显微CT的锥束重建技术

显微CT技术一直是Iowa大学CT/显微CT实验室研究的焦点。这篇文章报告了我们在锥束显微CT方面最近取得的一些进展。我们利用Feklkamp类算法了多X光源和检测器偏置条件下的近拟图象重建；解释了Grangeat精确重构框架下的图象伪影。最后重点介绍了最近有关一般分块迭代Landweber格式的收敛性结果；给出了模拟和实验结果，探讨了进—步的研究方向。     

长春市南湖生态环境的现状及恢复重建途径的研究

描述了长春市南湖污染的现状及发展趋势，论述了南湖面临着严重的水源危机的观点。同时，提出并详细讨论了恢复重建南湖良好的生态环境的五项措施：（1）清除淤泥体的表层污泥，减轻南湖的内部污染；（2）因地帛宜建造生物氧化塘，对污水进行生物氧化处理。（3）引导更多的雨水进入南湖。（4）合理开采南湖地区的地下水资源补给南湖。（5）改造两条地表径流的生态环境。     

Reconstruction of summer temperature (June—August) at Mt. Helan, China, from tree-ring stable carbon isotope values since AD 1890

From stable carbon isotope analysis of tree-rings of Chinese pine (Pinus tabulaeformis) from Mt. Helan, China, we found that high-δ¹³C values were related to high mean temperatures from June to August (T ₆₈), and Iow-δ¹³C values corresponded to low T ₆₈. From these data, a transfer function has been used to reconstruct summer temperatures (T ₆₈) for the Mt. Helan region. The explained variance of reconstruction is 34.9% (F=15.01, p<0.001). The time period containing the highest summer temperatures in northern China (late 1920-1930s) was confirmed by our reconstruction. The data indicate that there is a tele-connection between summer temperatures in Mt. Helan area and sea-surface-temperatures in the tropical Pacific. The extreme low temperature periods around the years of 1920 and 1947 for Mt. Helan region correspond well to the cold climate in the tropical Pacific. Along with other analyses, this suggests that climate variations in the Mt. Helan region are driven not only by local events, but also by the global climate. Significant periodicities appearing in the reconstruction are 2.56 and 2.63 years.     

基于双立体同步摄影的面部三维重建与量测

介绍了利用多台数码相机基于双立体同步摄影的面部三维模型重建与量测系统 ,提出了一种半自动提取格网点的有效方法。实现了无接触、无伤害、快速地获取面部三维数据和面部特征数据 ,为临床诊治提供依据。实验表明 ,系统达到了 0 .5 m m的量测精度 ,完全能满足实际的精度需求。     

Tectonic reconstruction of the northern Andean blocks: Oblique convergence and rotations derived from the kinematics of the Piedras–Girardot area, Colombia

A detailed kinematic study in the Piedras–Girardot area reveals that approximately 32 km of ENE–WSW oblique convergence is accommodated within a northeast-trending transpressional shear zone with a shear strain of 0.8 and a convergence factor of 2. Early Campanian deformation is marked by the incipient propagation of northeast-trending faults that uplifted gentle domes where the accumulation of sandy units did not take place. Maastrichtian unroofing of a metamorphic terrane to the west is documented by a conglomerate that was deformed shortly after deposition developing a conspicuous intragranular fabric of microscopic veins that accommodates less than 5% extension. This extensional fabric, distortion of fossil molds, and a moderate cleavage accommodating less than 5% contraction, developed concurrently, but before large-scale faulting and folding. Paleogene folding and southwestward thrust sheet propagation are recorded by syntectonic strata. Neogene deformation took place only in the western flank of this foldbelt. The amount, direction, and timing of deformation documented here contradict current tectonic models for the Cordillera Oriental and demand a new tectonic framework to approach the study of the structure of the northern Andes. Thus, an alternative model was constructed by defining three continental blocks: the Maracaibo, Cordillera Central, and Cordillera Oriental blocks. Oblique deformation imposed by the relative eastward and northeastward motion of the Caribbean Plate was modeled as rigid-body rotation and translation for rigid blocks (derived from published paleomagnetic and kinematic data), and as internal distortion and dilation for weak blocks (derived from the Piedras–Girardot area). This model explains not only coeval dextral and sinistral transpression and transtension, but also large clockwise rotation documented by paleomagnetic studies in the Caribbean–northern Andean region.     

材料表面非线性振荡时间序列的相空间重构

在许多固态材料的表面存在着一种天然的非线性振荡花样，这些花样经计算机图像处理在时间和空间上呈现明显的分形特征。利用普通光学显微镜对Cu—Zn—Al合金表面的金相组织进行观察和分析，用高速摄像机拍摄了典型的振荡现象。借助计算机图像处理技术系统地研究该非线性振荡现象的形貌、结构特征及形成动力学规律，通过计算机编程技术构建系统的非线性动力模型，并重构系统的相空间。用R／S方法对系统时间序列的演化特征进行分析论证，结果表明，这种相空间重构方法具有较好的非线性预报效果。     

Photogrammetric Reconstruction of the Great Buddha of Bamiyan, Afghanistan

In the valley of Bamiyan, Afghanistan, approximately 1700 years ago, two large standing Buddha statues were carved out of the sedimentary rock of the region. They were 53 and 38 m high and the larger one figured as the tallest representation of a standing Buddha in the world. In March 2001 the Taleban government militia demolished the colossal statues. After the destruction a group from ETH Zürich completed the computer reconstruction of the Great Buddha, which can serve as the basis for a physical reconstruction. This paper reports the results of the image-based 3D reconstruction of the statue, performed on three different data-sets in parallel and using different photogrammetric techniques and algorithms.     

基于航空立体影像对的复杂房屋三维拓扑重建

对利用航空影像对重建复杂房屋三维模型进行了研究，提出了拓扑链、外拓扑和内拓扑的概念，分析了复杂房屋的内拓扑和外拓扑的三维重建，构造了复杂房屋的三维拓扑数据模型。基于此模型设计了双向搜索算法，用于自动构建复杂房屋的三维拓扑面，从而实现了复杂房屋的自动三维拓扑重建。实验证明，本文提出的双向搜索算法是很稳健、高效的。