应用CHIMEHERB人工皮覆盖网状植皮创面     

张民权  胡锡浩  董立纲  金丽华  吴天斌  陈军 《中国海洋大学学报(自然科学版)》1989,(Z3)

应用CHIMEHERB人工皮覆盖烧伤切(削)痂后自体网状植皮创面30例、44个创面,每例平均应用体表面积为5.22％,网状皮扩展比例为1:3.结果有明显积液者5个创面(11.36);感染3个创面(6.82％);需要补植皮创面4个(9.1％).人工皮具有良好的透气性和透湿性,可给创面造成无菌的内环境,未观察到过敏反应和排异现象,贮藏不需特殊设备,使用方便,具有人工皮所要求的基本特性,作为自体网状植皮表层覆盖物,可取得良好效果,值得临床推广应用.  相似文献   

Role of learning in mesh penetration behaviour of haddock (Melanogrammus aeglefinus)   总被引：1，自引：0，他引：1  

Ozbilgin  H.; Glass  C.W. 《ICES Journal of Marine Science》2004,61(7):1190-1194

  相似文献   

东中国海潮波自适应数值模型及其数值模拟     

周旭波  孙文心 《中国海洋大学学报(自然科学版)》2001,31(6):815-820

首次为整个东中国海设计出一种自适应网格 ,利用自适应网格能同时兼顾网格的光滑性、正交性及疏密程度的特点 ,得到了物理平面上的网格分布。该网格既与边界适应 ,又在水深变化急剧的东海陆坡处得以加密 ,从而使坐标变换下的三维模式成功实现了跨越陆坡的计算。用该模式模拟了海域的潮汐变化。依据所得结果绘制出 M2 分潮的同潮图和潮流椭圆。模拟结果与现有的数值研究结果基本一致 ,表明此模式在该海域的适用性  相似文献   

尼罗罗非鱼对两种网目定置网片反应特性的比较   总被引：3，自引：0，他引：3  

蔡厚才  何大仁 《台湾海峡》1991,10(4):380-385

本文就尼罗罗非鱼对两种网目(12.6和8.4cm)定置网片的反应特性进行了比较研究。结果表明:在两网片邻近区域内的分布尾次数较中间区域为少;随着时间推移,其分布重心有移向大网目网片一侧的倾向。此外,罗非鱼对两种网目网片的趋网、碰网、穿网尾次数及趋网、碰网、穿网时刻也有一定的差异。  相似文献   

Interactions between nonlinear water waves and non-wall-sided 3D structures     

C.Z. Wang  G.X. Wu  K.R. Drake 《Ocean Engineering》2007,34(8-9):1182-1196

Interactions between water waves and non-wall-sided cylinders are analyzed based on velocity potential theory with fully nonlinear boundary conditions on the free surface and the body surface. The finite element method (FEM) is adopted together with a 3D mesh generated through an extension of a 2D Delaunay grid on a horizontal plane along the depth. The linear matrix equation for the velocity potential is constructed by imposing the governing equation and boundary conditions through the Galerkin method and is solved through an iterative method. By imposing the gradient of the potential equal to the velocity, the Galerkin method is used again to obtain the velocity field in the fluid domain. Simulations are made for bottom mounted and truncated cylinders with flare in a numerical tank. Periodic waves and wave groups are generated by a piston type wave maker mounted on one end of the tank. Results are obtained for forces, wave profiles and wave runups. Further simulations are made for a cylinder with flare subjected to forced motion in otherwise still open water. Results are provided for surge and heave motion in different amplitudes, and for a body moving in a circular path in the horizontal plane. Comparisons are made in several cases with the results obtained from the second order solution in the time domain.  相似文献   

引入导航网格的室内路径规划算法     

林巍凌 《测绘科学》2016,41(2):39-43

随着社会、经济的不断发展进步,室内导航定位越来越重要,其导航定位精度、准确性倍受业界关注,而路径规划是该研究方向的重要组成部分。针对传统的基于节点的拓扑模型无法较好解决室内空间"路网"的模糊性问题,该文分析了室内外导航定位的差异,并对传统路径规划算法的局限性进行了分析,提出将基于Delaunay三角剖分导航网格的A*算法应用于室内导航路径规划中。通过算例验证了该方法的有效性,具有较好的实用价值。  相似文献   

MapGIS和Section整合绘制边界约束下的属性等值线的方法——以堆积铝土矿为例     

陆芳 《矿产与地质》2016,(3):496-499

矿体作为一种特殊的地质体,其厚度等值线应受限于边界之内,这种约束特征用常规的计算机等值线绘制无法体现,为了表示边界线的约束特征,通过MapGIS和Section整合,可对边界线进行处理,提取子图元,赋予子图元边界线特有的相关属性,在属性结构相同的条件下使之与探矿工程子图元融合,然后采用Krining泛克立格法网格化模型绘制厚度等值线,形成的等值线均受限于边界线范围之内,真实的反映了矿体属性的本质,这种方法还可以绘制品位等其它属性等值线。作为约束条件的属性值必须是相同的,一般为零厚度、边界品位,边界含矿率等。矿体边界的属性值无法获得一致时,可通过外推边界的方法令其一致,具备此条件后即可进行属性等值线绘制。该方法实用、简捷。  相似文献   

汉江河谷旬阳段区域滑坡规律及斜坡不稳定性预测   总被引：4，自引：0，他引：4  

殷坤龙  晏同珍 《地球科学》1987,(6)

基于斜坡工程地质测绘和实验室分析,文中讨论了研究地段区域滑坡规律。引入信息量及二态变量回归分析建立了斜坡不稳定性两种预测模型。文章重点论证和提出了影响因素筛选、多边形网格单元划分的原则及预测精度评价的原理方法。编制了斜坡不稳定性分区图,检验表明其预测精度高;两预测分区图对比表明有很好的一致性。  相似文献   

Sieve mesh size and quantitative chironomid paleoclimatology     

Dirk Verschuren  Hilde Eggermont 《Journal of Paleolimnology》2007,38(3):329-345

The minimum sieve mesh size for fossil chironomid analysis is usually set at 100 μm, to ensure adequate recovery of small species. Yet taking into account the labor intensity of sorting and identifying fossil chironomid remains, the large numbers of samples requiring processing in paleoclimate studies with high temporal resolution, and the increasing need to engage non-specialist analysts in this work, it seems appealing to sieve samples through a larger mesh size that would mainly retain easier-to-see, easier-to-extract and easier-to-identify fossil specimens. In this study we evaluated the influence of sieve mesh size on chironomid-based quantitative paleoenvironmental reconstructions in African lakes. We developed two chironomid-salinity calibration data sets based on either the >100 μm or >150 μm size fractions of surface-sediment fossil assemblages, and compared the performance of salinity-inference models derived from them. We find that, despite ∼35% additional fossil loss, restriction to >150 μm data did not appreciably affect individual taxon optima or tolerances, and resulted in only a modest reduction of mean taxon richness per lake. Parameters of statistical model performance were as good, or better than those of models based on the >100 μm data, albeit only after excluding two atypically dilute (<100 μS/cm) lakes from the calibration. Application of inference models based on >150 μm or >100 μm data to a 200-year fossil record from Lake Abiyata, Ethiopia, produced very similar trends, amplitudes and uncertainty ranges of inferred past salinity change. Restriction to >150 μm data reduced the mean fossil yield of core samples by ∼20% on average, i.e. fossil loss was markedly lower than in surface-sediment samples. Using the larger mesh size reduced sample processing time by up to 50%, partly by removing a significant proportion of visually obstructive organic debris, and partly by allowing a greater fraction of chironomid fossils to be identified directly in the sorting tray. The fraction of 1st instar group taxa in surface-sediment samples was reduced from 13% to 3%, increasing the mean taxonomic resolution of fossil assemblages, and thus their ecological specificity.  相似文献   

三维稳定渗流的 p 型自适应有限元分析   总被引：3，自引：2，他引：3  

费文平  陈胜宏 《岩土力学》2004,25(2):211-215

建立了三维稳定渗流的p型自适应有限元分析的误差估计器。充分利用p型有限元前处理少、计算精度高和收敛速度快的优点，分析了p型有限元法求解渗流问题的技术特点，给出了求解三维稳定渗流的自适应升阶策略。通过具体算例，研究了单元阶次及网格尺度对计算结果的影响，验证了三维p型有限元法在求解渗流问题时的可行性。  相似文献