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121.
目的探讨脊柱损伤的CT诊断价值及临床意义.方法对72例脊柱损伤进行回顾性分析,其中男性65例,女性7例.结果 CT诊断共计86节椎体骨折,累及T11~L2椎体依次为8节,30节,36节,12节.结论 CT能正确的评价脊髓损伤的类型,了解椎管内受损程度,判定脊柱稳定与否,是指导临床手术治疗和预后评估的一种较好的方法. 相似文献
122.
123.
Contamination,chemical speciation and vertical distribution of heavy metals in soils of an old and large industrial zone in Northeast China 总被引:5,自引:0,他引:5
Fayun Li Zhiping Fan Pengfei Xiao Kokyo Oh Xiping Ma Wei Hou 《Environmental Geology》2009,57(8):1815-1823
Heavy metal pollution of soils has become a major concern in China as a consequence of rapid urbanization and industrialization
in recent years. However, the evaluation on soil heavy metal pollution in Shenyang, the largest heavy industrial base city
in China, has not yet been conducted. In this study, accumulation, chemical speciation, and vertical distribution Cu, Zn,
Pb and Cd in soils were studied and pollution condition was assessed in Tiexi Industrial District of Shenyang, the largest
and oldest industrial zone in Northeastern China. The results showed that in topsoil, the average concentration of total Cu,
Zn, Pb, and Cd was 209.06, 599.92, 470.19 and 8.59 mg kg−1, respectively, much higher than the national threshold limit. The values of pollution index and integrated pollution index
showed that the pollution level was Cd > Cu > Zn > Pb, and Cd, Cu and Zn belong to heavy pollution level. The residual, Fe
and Mn oxide-bound, and organic-bound species accounted for about 90%, while carbonate-bound and exchangeable species accounted
for about 10%. This study indicates that the soils in the industrial zone were widely and extremely polluted by multi-heavy
metals as a result of long-term industrial activities. 相似文献
124.
上海城市天际线与高层建筑发展之关系分析 总被引:4,自引:1,他引:3
以上海市2000年中心城区航空影像为基础,基于GIS技术分析城市高层建筑与天际线的分布特点及其影响机制。认为城市天际线与高层建筑相互制约,高层建筑的发展与布局必须考虑城市天际线的特色。 相似文献
125.
黄宗英 濮祖荫 肖池阶 宗秋刚 傅绥燕 谢伦 史全岐 曹晋滨 刘振兴 沈超 史建魁 路立 王迺权 陈涛 T Fritz K-H Glassmeier P Daly H Rème 《地球物理学报》2004,47(2):181-189
2001年1月26日11:10~11:40UT, ClusterⅡ卫星簇位于午后高纬磁鞘边界层和磁鞘区,此 时行星际磁场Bz为南向. 本文对在此期间观测到的多次磁通量管事件作了详细的研究 ,获得一系列的新发现:(1)高纬磁鞘边界层磁通量管的出现具有准周期性,周期约为78s ,比目前已知的磁层顶向阳面FTE的平均周期(8~11min)小得多. (2)这些通量管都具有 强的核心磁场;其主轴多数在磁场最小变化方向,少数在中间变化方向,有些无法用PAA判 定其方向(需要用电流管PAA确定),这与卫星穿越通量管的相对路径有关. (3)每个事件 都存在很好的HT参考系,在HT参考系中这些通量管是准定常态结构;所有通量管都沿磁层顶 表面运动,速度方向大体相同,都来自晨侧下方. 通量管的径向尺度为1~2RE, 与通 常的FTE通量管相当. (4)起源于磁层的强能离子大体上沿着管轴方向由磁层向磁鞘运动; 起源于太阳风的热等离子体沿管轴向磁层传输. 通量管为太阳风等离子体向磁层输运和磁层 粒子向行星际空间逃逸提供了通道. (5)每个通量管事件都伴随有晨昏电场的反转,该电 场为对流电场. 相似文献
126.
The Kungurian-Capitanian ( Permian) Zhesi branchiopod fauna is mainly composed of cold-water typed taxa with high diversity and abundance. This fauna is similar with the coeval brachiopod faunas from Timan-Pechora,Svalbard,and Queen Elizabeth Islands of the Boreal Realm,with no real"warm-water"species. Zhesi brachiopod fauna is a cold-water fauna and should be assigned to the Boreal Realm. Considering the paleogeographic characteristics of this fauna and the basic rationale of paleobiogeographic provinces being controlled by latitude-temperate,and that the above areas were located at 50°N 70°N in the global paleoclimate reconstruction map compiled by Boucot et al. ,the paleo-latitude of the southern margin of Jiamusi-Mongolia Block,where developed the Zhesi brachiopod fauna,is suggested ranging from 40°N to 60°N. Zhesi brachiopod fauna is an endemic fauna,containing more than 75% endemic species and self-grouped as a biogeographic province,termed Inner Mongolia Province. These characteristics indicate that this area was closed or semiclosed at that time. On the Jiamusi-Mongolia Block,the Herlen-Jiamusi Old-land as an obvious "continental barrier"hindered the northward migration of the Zhesi brachiopod fauna and the immigration of brachiopod species from other areas. The Tarim plate has collided with the Kazakhstan plate and the western part of South Tianshan-Beishan-Xar Moron Ocean has been closed. At the same time,the western margin of Jiamusi-Mongolia Block was joined with the Tarim plate. The Xar Moron Ocean in south of Jiamusi-Mongolia Block was wide enough and the ocean temperature rose gradually southward,so that it is not suitable for the cold-water brachiopods to survive and thrive on the northern margin of the North China plate. Thus,the ocean with large width and high temperature formed another natural barrier for the southward migration of the cold-water brachiopods. 相似文献
127.
通过泥质砂岩单轴压缩蠕变试验,揭示岩石蠕变变形与破坏的特点,反映了不同应力路径下的岩石蠕变速率与发展过程,建立了泥质砂岩的非线性蠕变模型,并通过对试件施加侧向刚性约束和锚固约束,以反映地下工程围岩在平面应变状态和支护状态下的蠕变特性。研究结果表明,锚固约束可以显著提高岩石发生稳定蠕变的应力阀值,减缓蠕变速率。根据改进的蠕变方程进行试验数据的拟合,确定了改进的西原模型蠕变方程中的各物理量。与单轴蠕变试验结果对比表明,该模型的计算结果与试验数据吻合较好,说明改进的西原模型可较好地反映岩石加锚后的蠕变特征。研究结果对深部地下工程围岩的变形与稳定控制研究具有重要的指导意义。 相似文献
128.
内蒙古扎鲁特旗地区中侏罗统塔木兰沟组的厘定 总被引:1,自引:0,他引:1
扎鲁特旗地区发育的一套中性火山岩,前人曾将其置于二叠纪“大石寨组”、“青凤山组”,缺少古生物资料和测年数据.本次1:25万区域地质调查,在原1:20万划分的“大石寨组”、“青凤山组”的安山岩中采集了同位素测年样品,采用全岩激光40Ar/39Ar法测年,对火山岩样品进行了年代学研究,结果表明火山岩年龄为(172.7±2.0)~(165.2±1.3)Ma.鉴于这套火山岩地层岩石组合特征清楚,时代依据充分,在区域上具有一定的延展性和可填图性,故将这套火山岩地层重新厘定为中侏罗统塔木兰沟组. 相似文献
129.
根据孢粉组合特征及光释光测年结果,对分布在内蒙古东南部的第四系更新统做了进一步的划分和研究。研究结果表明,主要分布在内蒙古东南部的中更新统风积物,岩性为黄色亚砂土,含钙质结核,发育柱状节理,区域上称乌尔吉组,含Artemisia-Ephedra-Pinus孢粉组合,光释光测年结果为(40.4±1.9)~(110.0±7.5)ka; 下更新统沉积物,岩性为红褐色亚砂土及亚黏土,含钙质结核、砂砾透镜体,区域上称为赤峰黄土,含Artemisia-Polygonum-Betula孢粉组合,光释光测年结果为(200.9±9.6)~(220.4±13.2)ka。上述2套地层在内蒙古东南部广泛分布,更新世地层的划分为内蒙古东南部地区的第四系地层划分对比研究提供了基础地质资料。 相似文献
130.
The base of the Saerba Member (Mbr) of the Hongguleleng Formation (Fm.) probably lies in the Famennian Palmatolepis crepida Zone; the Longkou Mbr is probably a sedimentary wedge that thins out northwards; the Duguer Mbr has an approximate age from the upper part of the Pa. marginifera Zone or the Lower Pa. rugosa trachytera Zone through the top of the Pa. perlobata postera Zone; the Wulan Mbr has an age approximately corresponding to the whole Pa. gracilis expansa Zone. In the Bulongguoer section, the Lower Mbr of the Hongguleleng Fm. corresponds to Famennian Pa. crepida Zone through Pa. marginifera Zone; the Middle Mbr probably ranges from the Pa. r. trachytera Zone through the Pa. g. expansa Zone. The basal Namu Mbr of the Heishantou Fm. is probably the product during and after the Hangenberg Event in the upper part of the Siphonodella praesulcata Zone, which is still within the Devonian. In this context, the underlying Chasi Mbr may approximately correspond to the lower part of the S. praesulcata Zone (before the Hangenberg Event). Lateral distribution of strata indicates that the Upper Devonian in the Gennaren and Saerba areas each constitutes a structure of syncline, which differs from the previous recognition of a monocline structure. 相似文献