Alexandre Santos

12 Questions 14 Answers 0 Followers

Questions related from Alexandre Santos

There is an ulltrasonic transducer for measuring wood thickness?

I am looking for an ultrasonic transducer with a frequency range of 40-50 kHz for measuring wood thickness up to 200 mm (not for distance measurement). I need the emitter to send the sound and the...

16 January 2025 6,552 2 View

Inferences about soil physical properties (water +granulometry) using RGB +NIR spectrometry is possible?

Dear RG Members, I'd to know is inferences about soil physical properties (water +granulometry) using RGB +NIR spectrometry is possible? Thanks in advanced, ASANTOS

01 November 2017 9,274 3 View

What is better distance matrix for multivariate infrared spectroscopy analysis?

Dear RG Members, I try to analise multivariate infrared spectroscopy using PERMANOVA approach and I've like to know what is better distance matrix eg. mahalanobis, euclidian or other for...

30 September 2017 6,147 3 View

Any microspectrometer (8000 to 2000cm-1 wavenumbers) kit or similar on the market?

Dear RG Members, I'd like to know if there is any microspectrometer (8000 to 2000 cm-1 wavenumbers) kit or similiar on the market? I need a kind of kit that's combine a spectrometer to...

31 August 2017 647 0 View

Is there any approach to determine incremental variance explained in multivariate multiple linear regression?

Dear Members of RG community, I try to calculate incremental variance explained by variables in multivariate multiple linear regression model, but I don't have Sum of squares parameters like...

04 February 2017 2,790 3 View

Questionnaire formulation for analytic hierarchy process (AHP)

Dear Members, I'd like to create a questionnaire for analytic hierarchy process (AHP) in a insecticide study. In my study, each decision maker investigates the values (Saaty fundamental...

30 December 2016 2,551 9 View

Classification using a rule based in my example is possible?

I have a pairs contrasts (results$pairs) and descending order p value (results$p) in a data frame: pairs

04 October 2016 6,876 2 View

I'd like to know if there are any paper about chemical characterization of mealybug wax?

Dear Members, I'd like to know if there are any paper about chemical characterization of mealybug wax? Thanks, Alexandre

03 October 2016 2,119 3 View

Optimal coccinellidae density for a classical biological control approach?

I am looking for a good review about optimal coccinellidae density examples (preferentially exotic lady beetles against indigenous insects), when the purpose is a classical biological control...

17 June 2016 6,105 4 View

TOA planetary reflectance with negative values in Landsat8 imagery?

I'd like to know why I have negative values in TOA planetary reflectance when my SUN_ELEVATION (SE) is > 50º degrees? Considering θ SZ= Local solar zenith angle: SZ = 90° - θ SE approach gives...

13 June 2016 5,881 3 View

Potencial of medium spatial resolution satellite imagery for small scale estimation in crops. Reality or myth?

satellite imagery; small scale estimation; satellite sensibility

02 February 2016 6,024 4 View

I search colorimetric tests like bromide water for methane detection. Does anyone know any?

Methane. I search colorimetric tests like bromide water for methane detection. Does anyone know any?

25 December 2015 9,845 3 View