What is a reference band for polyisocyanurate (PIRs) foams in FTIR in order to account the density changes?

Dear experts, I am dealing with the synthesis and characterization of PIR foams. In particular, I am monitoring the kinetics of these foams by FTIR (please find the spectra attached below). As...

06 July 2019 5,462 3 View

In which way the contact between two reactants can be affected by the degree of mixing?

Dear experts, I am investigating how polyurethanes are affected by the degree of mixing. More in general, I am interested to study how the contact between the two reactants (in my case polyol and...

05 June 2019 4,724 7 View

How to mix pentane with polyol without air bubbles introduction by dynamic mixing?

Dea experts, I am working in the field of polyurethane synthesis. I would kindly ask it there is any method and/or techinique suitable to add liquid pentane (blowing agent) to the polyol phase...

05 June 2019 3,697 4 View

How to use Canny edge detector for polymeric (polyurethane) foams?

Dear experts, I would like to detect bubble (or cell) boundaries of polyurethane foams during their expansion. Please find attached two microphotographs of the abovementioned systems. How can I...

11 December 2018 981 2 View

Which model for gas sorption in liquid thin film polymers fits an s-shaped (sigmoid) isotherm properly?

Non-fickian (anomalous diffusivity) kinetics sorption.

08 September 2018 1,068 0 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

Looking for Materials with high thermal expansion coefficient and high temperature resistance?

03 March 2021 8,272 1 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

Anyone plz suggest relevant topic for research in image processing+Deep learning.?

I have selected brain tumor images ...but now found that already lots of research done n this topic.

03 March 2021 5,774 3 View

How to increase a model accuracy ?

dear community, my model is based feature extraction from non stationary signals using discrete Wavelet Transform and then using statistical features then machine learning classifiers in order to...

03 March 2021 6,994 5 View

Chlorinated organic formation in odor control scrubbers using hypochlorite?

I'm involved in a study of odor control technologies for municipal wastewater treatment plant. One of the control options involves a chemical 2-stage (acid/alkaline) packed bed scrubber. The...

03 March 2021 3,661 2 View

Waters 2707 HPLC autosampler problem?

I am using a 2707 waters HPLC device. When I try to inject a sample, it says missing plate or rack. I changed the needle and calibrated its position but I still get the same problem. I even get...

02 March 2021 1,408 1 View

Is there any effect of different colours of light (white, red, yellow, blue etc.) on the rate of photosynthesis? If yes, why?

Light is inevitable for the process of photosynthesis reaction. Naturally sunlight plays the vital role for this process. Light may be of different colours like white, red, yellow, blue etc....

02 March 2021 7,890 2 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

Image Processing and classification using keras/Tensorflow?

Do you have some recommendations approaches on Image processing and classification of plant diseases using TensorFlow/Keras?

02 March 2021 1,493 4 View