冻土单轴压缩动态试验研究

讨论了冻土试样的制作过程。采用计算机层析扫描技术（CT）对未饱水和饱水冻土试样单轴压缩过程进行了动态测试，给出了冻土单轴压缩各承载阶段内部结构变化特征，基于CT测试对加载过程进行了分析，讨论了饱水冻土和未饱水冻土试样的破坏形式，并对空隙损伤阶段损伤进行了计算。     

CT检测技术在岩石加卸载破坏机理研究中的应用

利用专用的与CT机配套的三轴加载实验设备,采用CT实时试验的手段, 对连续加载试验条件下和卸围压应力作用下砂岩破坏细观机理进行了对比研究. 结果表明, 岩石的卸荷损伤演化破坏具有突发性.     

多层螺旋CT在诊断中心型肺栓塞的初步应用

目的是评价多层螺旋CT诊断中心型肺动脉栓塞的诊断价值。方法：6例肺栓塞病人行多层螺旋CT血管造影检查，结合三维成像技术进行图像分析。结果：6例病人的肺动脉病变以及主肺动脉扩张、肺梗死表现均较好显示，肺动脉病变主要表现为完全性或部分性充盈缺损。结论：多层螺旋CT是一种有效的无创性诊断中心型肺动脉栓塞的检查方法。     

急性放射性肺损伤的基础研究及其影像学研究进展

本文综述了急性放射性肺损伤的基础研究和影像学研究进展，包括其发病机制、病理形态改变、影响损伤程度因素、及生理改变和影像学研究主要是CT等方面的问题。     

肾肿瘤的CT鉴别诊断

目的是探讨肾肿瘤的鉴别诊断。采用的材料与方法是对27例肾肿瘤的CT征象进行分析。结果表明肾癌9例，肾血管平滑肌脂肪瘤7例，肾血管平滑肌脂肪瘤恶变1例，恶性淋巴瘤并右肾侵犯1例，肾盂癌1例，肾盏癌2例，肾嗜酸性细胞2例，肾母细胞瘤3例，肾恶性血管外皮细胞瘤1例。结论为各种肾肿瘤都有其特征性的CT征象，CT扫描可以对大部分肾肿瘤做出鉴别诊断。     

增强CT扫描和MR扫描使用加压注射安全措施分析

对2001－01月至2001－11月期间，在煤炭总医院行CT增强扫描和MR扫描使用数控加压注射器发生造影剂外渗的情况进行了回顾性分析。虽然加压注射器由于压力大，注射速度快，容易导致造影剂外渗，但是通过标准的技术操作，静脉穿刺部位和注射针头口径的合理选择以及预注射等措施是可以避免的。     

Robust multivariate procedures applied to the interpretation of atypical individuals of a Cretaceous foraminifer

Robust multivariate statistical methods are applied to samples of the Cretaceous bolivinid foraminifer Afrobolivina afra, in which individuals from microspheric and megalospheric generations dominate, but which also contain some pseudo-megalospheric specimens. Pseudo-megalospheric tests may cause values which are atypical in the statistical sense but which are fully normal biologically. Other atypical values derive from crushed specimens, microspheric individuals and unusual normal megalospheres with exceptionally wide shells and pointed last chambers. A wrongly punched specimen was also found by the procedure. The method employed here consists of plotting the generalized statistical distances calculated from robust estimates of means and of covariances against the quantiles of a Gaussian distribution; the presence of an atypical observation(s) is readily exposed by its departure from the main trend of the plot.     

Characterization of slip zone associated with the 1999 Taiwan Chi-Chi earthquake: X-ray CT image analyses and microstructural observations of the Taiwan Chelungpu fault

To characterize the fault-related rocks within the Chelungpu fault, we performed X-ray computed tomography (CT) image analyses and microstructural observations of Hole B core samples from the Taiwan Chelungpu-fault Drilling Project. We identified the slip zone associated with the 1999 Chi-Chi earthquake, within the black gouge zone in the shallowest major fault zone, by comparison with previous reports. The slip zone was characterized by low CT number, cataclastic (or ultracataclastic) texture, and high possibility to have experienced a mechanically fluidized state. Taking these characteristics and previous reports of frictional heating in the slip zone into consideration, we suggested that thermal pressurization was the most likely dynamic weakening mechanism during the earthquake.     

基于DEM的地理坐标系下航空摄影技术设计

本文通过分析地形起伏对像片重叠度的影响,提出了在地理坐标系下基于DEM的航空摄影技术设计,研制了的航空摄影技术设计软件系统,将该系统设计的数据结果同实际飞行数据进行了对比,实验证明使用该软件系统敷设的航线像主点更科学、更合理。     

Nonlinear SEM numerical analyses of dry dense sand specimens under rapid and dynamic loading

The paper mainly concerns the mechanical response of 2D dry dense sand specimens under shock loading. The problem is numerically analysed by means of a SEM dynamic code, within which an already conceived non‐local viscoplastic constitutive model characterized by a non‐associated flow rule and by an anisotropic strain hardening has been implemented. In particular the strain localization and time dependency of the material mechanical response are taken into consideration. Both rapid/static loading and dynamic histories are numerically simulated. In the first case, the time dependency of the material mechanical response can be captured by neglecting inertial effects, while in the second one the two factors are superimposed and the propagation of the stress waves within the specimen is discussed. The interest of these analyses derives from the fact that the diffusion phenomenon takes place within a specimen already localized. Copyright © 2006 John Wiley & Sons, Ltd.