Iron deficiency chlorosis of Lilium davidii var. unicolor is often the case in practice in alkaline soils of northwest region of China. It is difficult to control iron chlorosis because of high cost a
Natural resource-management studies have become increasingly attentive to the influences of human factors. Among these,cultural biases shape peoples responses to changes in natural resource systems. S
There are a number of structures and structural styles found in extensional tectonic settings of the world,and it is a big challenge to study the evolution of these structures. Evolution of structures
针对目前曲线弯曲拓扑结构描述中存在弯曲划分不符合人的视觉感受等问题,该文提出一种利用弯曲层次树描述曲线拓扑结构的方法。该方法利用双缓冲区变换识别曲线上的弯曲,通过控制变换宽度提取不同层次上的弯曲,根据得到的弯曲构建弯曲层次树,树的结点代表不同的弯曲,同一层结点表示弯曲之间相邻关系,不同层结点表示弯曲之间的嵌套关系。最后通过该方法在曲线综合中的实验验证了其在曲线特征形态的保持中的优势。该文对曲线拓扑
China has mobile phone penetration rate of over 96.2%.Mobile phone has become the largest Internet terminal for Chinese Internet users.Population geographic distribution in earthquake zones can be got
The observatory network of the Crustal Deformation China Seismological Bureau was equipped with vertical pendulum tiltmeter,borehole tiltmeter,tunnel extension meters,multi-component borehole strainme
当前大多交通轨迹数据的划分方法并未考虑空间分布的任意性,划分点较单一,从而导致分析效果并不理想。针对此问题,本文提出了多特征轨迹数据点结合数据空间划分方法,对提取采集到的海量交通轨迹的记录点,利用α-Shapes算法进行预处理并去噪,计算轨迹特征点,对这些特征点按空间接近度进行分组,之后按照位置关系进行Voronoi划分。该方法克服了轨迹数据划分时因空间分布任意性导致的划分效果不明显的缺点,有效地