Paulo Ricardo Gherardi Hein

5 Questions 9 Answers 0 Followers

Questions related from Paulo Ricardo Gherardi Hein

Why does shrinkage in tangential direction is higher than radial shrinkage during wood drying?

There are many explanations about the reasons why tangential shrinkage is more intense than radial shrinkage when wood dries. After all, what are the main reasons?

03 March 2017 1,268 9 View

How to evaluate the quality and quantity of wood extractives?

What is the most appropriate technique to find out what chemical components are present in wood extractives from native species in Brazil? And what is the best technique to quantify each type of...

21 November 2016 6,385 5 View

PLS-R validation based on NIR spectroscopic data with negative R²: what does it means?

I am developing PLS-R calibrations based on NIR spectra for estimating wood density. When I used a totally independent set of 18 unknown samples to validate this model, I found a negative R² for...

23 July 2016 6,278 4 View

What are the most suitable solvents to extract volatile material from vegetable charcoal?

Dear, I plan to extract the volatile material from vegetable charcoal to further analyze the extract. I thought about doing the extraction with polar and nonpolar solvents. someone might suggest...

01 April 2015 6,131 8 View

Does anyone know how to open/run DPT files (NIR spectroscopic data) in The Unscrambler software?

Does anyone knows how to open/run DPT files (NIR spectroscopic data) in The Unscrambler software?

29 August 2014 9,630 31 View