concavities

concavities的基本解释

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[变形] concavity的复数形式

n.

中央凹陷, 凹洼, 凹状

与concavities相关的网络例句 [注：此内容来源于网络，仅供参考]

The sand dunes analyses data have shown they mainly consist of well sorted, symmetry skewness and find sands, and the kurtosis peak is narrow or very narrow. There are abundant impacts of mechanic process on the surface of quartz grains. The traces of eolian process often superpose on the traces stamped by river and beach processes. The dish--shaped concavities and mechanic pits are the most common surface textures, but the barchan concavities and curved grain edges are indicated the marks by eolian environment. The heavy minerals assemblages of coastal dunes are dominated by relatively high specific gravity which have stable chemical properity suggesting the mordern high dynamic environments of coast area. The depositional structures of coastal dunes are typified by corss--bed sets composed of steep foreset laminates and gentle windward dipping sets. It also contains some shell fragments and strong worn foraminiferal tests that are impossibly found in inland desert. On the other hand, the sandy deposits of the continental shelf of East China Sea are with wide range of grains, and the depositional pattens are quite complicated.

海岸沙丘是晚全新世以来相对稳定的海平面背景下的海岸带风成堆积，其沉积特征是以细沙为主，分选好，搬运方式以跃移占绝对优势，偏度上近对称，峰态窄到很窄；石英颗粒表面机械作用形态丰富，风成作用形态叠加于河流和海滩过程形态之上，碟形坑和撞击麻点是最为常见的表面形态，而新月形坑和曲脊是其指示性的特征标志；沙丘沙重矿物以化学性质稳定、比重较大的种类为主，反映了海岸带目前的高能动力环境；海岸沙丘沙的沉积构造以高角度前积层和低角度顶积层组成的交错层理为典型特征，同时还含有少量内陆沙漠所没有的少量贝壳碎屑和强烈磨损的有孔虫壳体。

After repeated studies, we found that gradient vector flow deformable model is robust to model initialization and not stagnant by local energy minimum, but still is difficult to handle boundary concavities. Thus, we develop a modified technique to overcome this drawback. This technique makes active contour further progress into concavities.

经过反覆实作，我们发现GVF较不受模型初始值之影响，而且不会因局部极小能量而停滞，然而此法仍难以进入凹陷处，因此我们也研发了一种改良技术来克服这个缺点。

Of, relating to, or being a surface characterized by smooth, shell-like convexities and concavities, as on fractured obsidian.

贝壳状的表面光滑且呈贝壳状凸凹特点的、或与之有关的，如黑曜石碎块