What is the best technique to detect chemical reasons for viscosity decrease in a mineral oil?

More Giuseppe Pintaude's questions See All

How to normalized a coutour plot in Abaqus?

I am trying to edit the odb file to get new data for the elements. I need to plot stress components divided over a specific value. Can it be done using python?

20 January 2021 9,557 3 View

In a random graph, the number of paths that cannot be extended in an hamiltonian path, can be roughly be separated in two equal parts ?

In a random graph, the number of paths that cannot be further extended in an hamiltonian path or an hamiltonian cycle, can be roughly be separated in two equal parts? I have an idea for solve for...

07 January 2021 9,782 2 View

Headset microphone for phonetic analyses: any suggestion?

Hi all, due to the current health crisis, travelling for fieldwork is severely hindered and discouraged. However, I plan to ask a local confederate to fetch the microphone for me. I am...

28 December 2020 4,484 1 View

It is possible to determine ammonium and nitrate on 2M KCl extracts by HPIC?

Dear all, It is possible to determine ammonium and nitrate concentration on 2M KCl extracts by HPIC (Ion Chromatography)? Can you suggest me some analytical protocol (or manuscript) to determine...

09 November 2020 5,921 3 View

BBB permeability assay in mice ?

Hello! Is there anyone who could recommend a protocol for testing the permeability of the blood brain barrier in mice ? I tried to use these protocols (Assessment of Permeability in Barrier Type...

01 November 2020 8,191 3 View

Can I perform a network meta-analysis that include the same continuous outcome measured both as change from baseline and end value score?

Since I have some studies that reported the continuous outcome as change from baseline and others that reported it as end of value score, is it possible to include both?

24 July 2020 5,891 3 View

Remote collection of acoustic data: how to maximise quality and reliability?

Dear research community, we are all living in a difficult period which is challenging our plans and concentration. Since fieldwork is now impossible, do you know any reliable internet platform or...

13 May 2020 7,196 3 View

How to plot hoop and radial stress in function of the angle in cylindric coordinates?

Hi, I am trying to plot the mentioned stress component in postprocessing for a cylindric body in abaqus. I changed the coordinate system and i selected a path but I can' t choose the angle

27 April 2020 2,803 3 View

What is in your opinion the best model to test these relationships? Multiple regression, SEM..?

Dear all, I hope you can give me your opinion about this. I have to test the following relationships (see attached image): X1 to X4 are my main independent variables; they cannot be measured...

26 February 2020 8,769 12 View

Do I need to take into account the different sample sizes when performing false-discovery-rate procedure for multiplicity correction?

EDITED I have a dataset of brain images in which each pixel value corresponds to a measure of neuron activity. The images were taken in different conditions described by three regressors (two...

08 November 2019 8,299 3 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

12% ledeburitic cold work tool steel, etched for revealing retained austenite, any help for clarifying?

Hello everyone. Given microstructure image belongs to a 12% ledeburitic cold work tool steel (annealed and tempered). The sample was etched with picral (100 mL ethanol and 4 g picric acid). I...

02 March 2021 4,119 3 View

How Can I bring as much common elements in steel as possible to calculate stable phase(s) in OpenCalphad?

As I was tweaking step-by-step OpenCalphad6 Macros step1.ocm involving phase and thermal property calculation of a High-speed steel, I could not incorporate more than 6 elements in the steel...

01 March 2021 8,840 1 View

How can you bring two structures together to create an adhesive bond in LAMMPS?

I have created an Ice 1h crystalline structure and an Aluminium substrate structure and equilibrated both at 250K. Now I need to bring them together in a way that an adhesive bond is created....

01 March 2021 3,325 2 View

What is the indication of the absence of peaks in Methanol electrooxidation CV curves ?

I have several question regarding the MOR; hope anyone help me better understand. 1- in CV using (KOH+MEOH) what is the indication of absence of the redox peaks? shouldn't they exist as a sign...

28 February 2021 4,851 8 View

What is the density for pva electrospining?

I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is...

28 February 2021 298 3 View

Is anyone familiar with the cyclic compressive fatigue testing (BS EN 12697 - 25) ?

I would like to get more information on the cyclic compressive fatigue testing (BS EN 12697 - 25) which is typically done for bituminous material in pavement design. Any one can advise on the...

28 February 2021 2,004 3 View

Giuseppe Pintaude

I saw that XPS would be a possible technique, but I dont know if it is suitable for this case.

Lauri Kari Johannes Hauru

XPS is definitively not the right one, since it require ultra-high vacuum. If you suspect oxidation, then detect the oxidation products. For instance, functionalize them and do NMR or color reagents. They would also show up in GC or GC-MS after a silylation with e.g. BSTFA. Water could be there also, so check it with Karl Fischer titration. Finally, some sort of chromatography such as HPLC to estimate the distribution of molar masses would be helpful.

Thanks very much dear Lauri, I will search your indications.