Ecole des Sciences Criminelles, University of Lausanne, Batochime, UNIL-Sorge, CH-1015 Lausanne, Switzerland.
National Institute of Criminalistics and Criminology, B-1120 Brussels, Belgium.
Forensic Sci Int. 2021 Jan;318:110593. doi: 10.1016/j.forsciint.2020.110593. Epub 2020 Nov 18.
The persistence of fibres under outdoor conditions is seldom investigated. This research aimed to study simultaneously the influence of several factors (and their cross-interactions) on the persistence of fibres on static textile surfaces. In order to achieve this aim, a design of experiments was successfully implemented under laboratory conditions. Four factors were considered: time, inclination of the recipient textile, wind speed, and rainfall. The model obtained by this supervised method was compared with the results collected under actual outdoor conditions near a weather station. The resulting model appears to be reliable as long as the values of the factors are kept within the range used in the study. The results of the laboratory tests showed that wind speed and rainfall significantly influence the persistence of fibres while time and inclination of the recipient textile have been found to be nonsignificant. In general, the observed persistence was high: between 90.4 and 100%. This might be attributed to the recipient textile surface possessing abundant protruding fibres which "traps" the transferred fibres. Outdoor experiments usually suffer from a higher variability and result in a higher fibre loss. In outdoor conditions, wind and rainfall have shown an extensive influence on the fibre persistence. Finally, the trend of fibre persistence on static textiles in outdoor conditions is generally linear with time, but extreme meteorological condition will induce exponential losses.
纤维在户外条件下的持久性很少被研究。本研究旨在同时研究几个因素（及其交叉相互作用）对静态纺织表面上纤维持久性的影响。为了实现这一目标，在实验室条件下成功实施了实验设计。考虑了四个因素：时间、接收纺织品的倾斜度、风速和降雨量。通过这种监督方法获得的模型与在气象站附近的实际户外条件下收集的结果进行了比较。只要保持在研究中使用的因素值范围内，所得模型似乎是可靠的。实验室测试的结果表明，风速和降雨量显著影响纤维的持久性，而接收纺织品的时间和倾斜度被发现没有显著影响。一般来说，观察到的持久性很高：在 90.4%到 100%之间。这可能归因于接收纺织品表面具有丰富的突出纤维，这些纤维“捕获”转移的纤维。户外实验通常受到更高的可变性的影响，并导致更高的纤维损失。在户外条件下，风和雨对纤维的持久性有广泛的影响。最后，户外条件下静态纺织品上纤维持久性的趋势通常随时间呈线性变化，但极端气象条件会导致指数损失。
