水泥地面上滴落状血迹形态的模拟实验

目的观察水泥地面上不同高度、速度对滴落状血迹的形态和大小,应用于现场勘验。方法采用等量抗凝人血,在静态和动态条件下,进行滴落状血迹的模拟实验,观察血迹的形态,测量其直径,用专业统计软件进行分析。结果在静态条件下,滴落状血迹呈圆形,其周围有毛刺状突起;滴落状血迹的大小(直径)与滴落高度之间有较好的线性关系,可得出回归方程。在慢走、急走、跑、快跑动态条件下,滴落状血迹为圆形或椭圆形,沿运动方向的一侧出现突起;高度、速度分别对血迹形态有影响,而且两者有交互作用。结论滴落状血迹形态和大小的观察和测量,可用推断出血部位的高度、运动速度和方向。

An Experimental Study of drip bloodstain on cement ground

Objective To observe the shape and size of drip bloodstain on cement ground which dropped in different heights, speeds or height and speed. Methods Anticoagulation blood was dropped in static or movable conditions. The drip bloodstain was observed .The diameter was measured. The data were analyzed by special statistic software. Results In static conditions, the drip bloodstain was shaped round with stings on edge. There were linear relationship between the diameter and height, which could deduce linear formula. In walk, hurry walk, run and dash movable conditions, the drip bloodstain appeared as round or ellipse with stings on one side along direction of motion. Height or speed influenced the shape and size of drip bloodstain. Height and speed interacted on the shape and size of drip bloodstain. Conclusion The shape and size of drip bloodstain were useful to estimate the heights of bleeding, speeds and directions of motion.