薄层CT对肺内结节性病变的诊断价值

本文利用薄层CT扫描技术,对支气管微细结构和改变,对肺内结节性病变大小、边缘、钙化、CT值及定位进行观察,分析了炎性纵隔淋已结肿大的特点。对肺内不肯定结节行CT 导引下活检,可明确诊断。切凹征、胸膜牵拉征、小泡征、小蜘蛛状改变、血管聚集等对肺癌的定性诊断具有重要价值。     

江汉盆地潜江凹陷古近系潜江组含盐岩系沉积特征与沉积环境

潜江组盐层间的层段（盐间段）由砂岩和非砂岩两部分组成。其中非砂岩分布广泛，主要由单层厚度为毫米-厘米级累积厚度达几十厘米至几米的含盐韵律组成，并多为复成分的蒸发盐矿物、碳酸盐矿物及陆源的粘土和细碎屑矿物组成的混积岩。过去，人们对盐间段非砂岩的研究主要基于对岩性的认识，对于其沉积特征和沉积环境方面的研究较薄弱。本文通过对潜江凹陷西北部王场构造3口井共约151米岩芯的精细研究，对盐间段沉积特征和沉积环境进行了系统分析。认为潜江组盐间段湖盆环境为常年性较深水分层盐湖，大体可分为微咸水湖、半咸水湖、咸水湖和盐湖，水体深度自下而上逐渐变浅。     

Pygostyle-like Structure from Beipiaosaurus (Theropoda, Therizinosauroidea) from the Lower Cretaceous Yixian Formation of Liaoning, China

Pygostyle was previously considered as a unique structure of ornithothoracine birds, used to maneuver tail feathers. A similar structure from an oviraptorosaurian dinosaur was considered functionally associated with the rectrices as in birds. We report a pygostyle-like structure from a therizinosauroid dinosaur. The presence of filamentous integuments, but absence of rectrices, on the tail of this therizinosauroid, combined with other lines of evidence, suggests that the initial function of the pygostyle was not related to the rectrices.     

Structural Styles of Longmen Mountain Thrust Belt,SW China

Through field geological investigation and seismic interpretation of the Longmen (龙门) Mountain thrust belt, we summarized the following structural styles: thrust belt, fault-related fold (fault bend fold, fault propagation fold, and fault decollement fold), pop-up, triangle zone, duplex, superimposed fold, ductile deformation structures, reverse thrust fault, klippe, decollement structure,etc.. These structural styles have evident distribution characteristics; they had zonation and segmentation in plane. Th...     

南极磷虾的生长与复眼晶椎数目关系的研究

本文从自然种群现场取样和实验室内活体培养两个方面对南极磷虾复眼中的晶椎数目与磷虾体长之间的关系、在负生长状态下磷虾复眼中的晶椎数目的变化等进行了研究。实验结果表明：在正常情况下（磷虾身体不出现负生长），磷虾复眼中晶椎数目与体长之间存在指数函数关系。雌性磷虾的晶椎数目（ＮＯＣＣ）与体长（ＢＬ）之间的关系为ＮＯＣＣ＝４６３．６２ｅ０．０４８４ＢＬ（ｒ＝０．９６４２，ｎ＝２７３）。从活体培养的结果来看，当南极磷虾身体出现负生长时，磷虾复眼中的晶椎数目保持不变，即晶椎数目不受负生长的影响。晶椎数目与体长之间的比率可作为研究在自然环境中南极磷虾是否存在负生长的一种检测手段。     

黔东南地区褶皱构造样式及其断层突破模式

黔东南地区发育隔槽式褶皱组合和逆冲断层.通过对褶皱和地层的平面展布、断层的产状和性质以及滑脱层的分析, 结合典型地震剖面解释和平衡剖面恢复, 对黔东南地区构造特征及其成因进行了探讨.结果表明, 隔槽式褶皱的发育不仅与滑脱深度和剥蚀差异有关, 而且与逆冲断层的推覆距离、逆冲断层的产状、断坪断坡长度比、断层突破方式和多层次滑脱等方面存在着密切联系.结合区域构造演化和推覆距离的制约, 建立了黔东南地区的隔槽式褶皱构造样式的几何学和运动学模型, 确定其主要影响因素是断坪断坡长度比较小、多种方式断层突破和多层次滑脱.      

赣南大吉山五里亭岩体的锆石ELA-ICP-MS定年及其与钨成矿关系的新认识

大吉山是南岭地区一个著名的大型钨多金属矿床,五里亭岩体是矿区出露规模最大的火成岩体,岩性为中粗粒似斑状黑云母二长花岗岩。锆石 ELA-ICP-MS 定年结果表明其形成年龄为 237.5±4.8 Ma,属印支期岩浆活动的产物。与南岭地区典型钨多金属矿床成矿岩体相比,五里亭岩体贫硅,富钙、镁、铁,Rb/Sr、Rb/Ba 和 U/Th 比值低,K/Rb 比值高,铕负异常不显著,分异指数低,尚未达到矿化岩体的分异演化程度,不具备矿化岩体的地球化学特征。元素—同位素综合示踪显示区内白云母碱长花岗岩为五里亭岩体经高度分异演化的产物,它与钨多金属矿成矿直接有关。矿区范围内出露的闪长岩起源于地幔,这一岩浆侵位所引起的高热场环境有利于花岗质岩石的形成与演化,对成矿具有重要的意义。     

Application of Headland Control for Stability of Beaches

- Studies on the erosion processes and protective measures at the downcoast of the Friendship Port in Mauritania have been successfully conducted by means of 3-D movable-bed model using light model-sand. The headland control was accepted for the stability of the beach. This paper mainly deals with the shape, orientation, size and erosion depth of the artificial headland. Various forms of headland projects, such as the normal groin, arch groins bending to upcoast ancj to downcoast, offshore breakwater, and T-shaped dike, have been experimentally investigated. Through a comparison of effects of these works on the beach processes, optimized headlands have been obtained, that is, unsymmetrical T-shaped dike or arch groin bending to the downcoast, which has been practically and successfully applied for the stability of beaches.     

基于GIS的河道贴体网格自动生成算法研究

利用地理信息系统(GIS)基于空间位置信息的技术特点,对河道贴体网格的自动化生成算法进行了研究。基于GIS矢量线的节点间空间位置关系,对任意位置上的河道流向进行了较高精度的数值表达,进而实现了河道断面的自动剖分;设计出一系列算法,解决了网格生成过程中可能出现的交叉、拧绕等问题,从而保证了剖分网格对河道区域平面分布的自适应性特征;基于数字高程模型(DEM)高程插值,对河道区域地表模型进行重建与分析,生成得到的河道贴体网格。经验证,该算法具有较好的贴体性质和较高的运算效率。