Search results for " wood density"

showing 2 items of 2 documents

A Methodology for Protection of Trees Against Lightning Strikes as a Measure to Prevent Fires and Loss of Human Life

2021

Some regions may be characterized by a very low annual lightning ground flash density, and yet lightning strikes seem to have been in those areas the cause of widespread wildfires in forested areas. Due to global climate change, these occurrences seem to be an increasing threat. In this paper, the authors discuss the withstand capability of trees against lightning and introduce the criteria for the deployment of tree lightning protection systems (TLPS) to protect forested areas, where deemed necessary by the tree risk assessment. This work analytically identifies the critical trunk radius of the tree below which the tree may explode in the case of a lightning strike and ignite the surroundi…

collection areaHuman lifeflash densityFiresLightningIndustrial and Manufacturing Engineeringwood resistivityElectrical and Electronic EngineeringLightning protectionMoistureform factorConductivityVegetationbusiness.industryGlobal warmingEnvironmental resource managementtreesVegetationwood densityProtection systemcollection area; Conductivity; Fires; flash density; form factor; lightning; Lightning; Lightning protection; Moisture; resistivity; Temperature dependence; trees; Vegetation; wood density; wood resistivityLightningSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaresistivityCollection area Conductivity Fires flash density form factor lightning Lightning protection Moisture resistivity Temperature dependence trees Vegetation wood density wood resistivityTree (data structure)Lightning strikeTemperature dependenceControl and Systems EngineeringEnvironmental sciencebusinessIEEE Transactions on Industry Applications
researchProduct

A Comparison between the Latest Models of Li-Ion Batteries and Petrol Chainsaws Assessing Noise and Vibration Exposure in Cross-Cutting

2023

Chainsaw operators are exposed to many hazards that can lead to health problems. The two most frequently documented ergonomics threats in the use of chainsaws are noise and vibration exposure. Since the use of battery chainsaws is increasing due to the growing improvements in battery life and power, the study aims to compare the difference in terms of noise emission and vibration levels of the following two new models of chainsaws: the battery-powered Stihl MSA 300 and the petrol-powered Stihl MS 261 C-M. Black pine and European beech logs were cross-cut in order to evaluate both noise and vibration exposure. The results show that the use of battery-powered chainsaws, in comparison to the p…

hand-arm vibrationchainsaw; battery; wood density; wood defects; hand-arm vibration; noise; ergonomicswood defectnoiseergonomicsbatteryForestrywood densitychainsawSettore AGR/06 - Tecnologia Del Legno E Utilizzazioni ForestaliForests
researchProduct