How to eliminate the yellow color of aromatic polyurethanes?

I have made polyurethanes from methylene diphenyl diisocyanate (MDI). There is no moisture in the reaction. The final polymer is faint yellow or brown even when I used a sterically hindered...

28 May 2020 6,500 2 View

How to make a water sensitive hydrophobic monomer miscible with a hydrophilic monomer w/o using any solvent?

I am planning to run a polyurethane reaction which has two monomers: one is a diisocyanate and the other is a diol. However the diisocyanate is not forming a homogenous mixture with the diol. The...

26 September 2019 7,759 3 View

Need some clarification on items cross loading?

Dear friends,Kindly clarify the following doubt. The measurement model has 6 constructs (A, B, C, D, E, and F). A has 7 items, B has 6 items, C has 9 items, D has 5, and E has 12 items. Now, on...

10 May 2017 943 7 View

Is there any relation between Raman blue shift and change in work function?

Can anyone provide a good source of reference, or explanation please.

26 December 2016 5,423 3 View

In the mediating model, one of the direct and indirect Path Coefficient values are greater than 1. Why ?

23 October 2016 6,069 5 View

If the principal component analysis is not an inferential statistics, then can it be considered under descriptive statistics ?

18 May 2016 8,146 14 View

Why the results of beta weights in AMOS and beta coefficients in SPSS vary so much while doing the same model analysis?

17 April 2016 7,108 2 View

Negative value of fractional coordinate?

Is it possible for fractional coordinates to have -ve values? If possible please give some reference.

05 September 2013 7,184 8 View

Can anyone please recommend a process to etch ITO film?

ITO film etching

28 August 2013 9,491 18 View

Can tell me whether the ordinary differential equation admits periodic solution.

$$h''+ \sigma V^{-1}V_{\theta} h' + [(\lambda_1+ V_{\theta, \theta }) V^{-1}+ (\sigma^{-1}+1)k^2]h=0 $$ admits a solution where $h(0)= h(l)$ and $h'(0)= h'(l).$ Here V and k are periodic...

21 January 2013 2,976 2 View

Resistor definition in Piezoelectric bimorph with ANSYS workbench

Hello, good day! I am trying to simulate similar bimorph piezoelectric harvester with below commands. However, the output power doesn't change with resistor value. Please help to find the reason. ET,10,CIRCU94,0 !SET UP RESISTOR R,1,100000 !RESISTANCE VALUE TYPE,10 !SET ELEMENT TYPE E,1,2 !CREATE RESISTOR BETWEEN NODES 1 AND 2 Thanks in advance Regards,

02 March 2021 0 0 View

Any specific pipeline or parameter to analyse total transcriptomics study of brain tissue samples?

I have two groups of brain samples, control and treated for example. It was total RNA nova seq sequencing. I tried all the available pipeline like: star+rsem+deseq2, Hista+stringtie+cuffdiff,...

27 February 2021 356 6 View

What are the application of Fixed points thoery in Chemistry.?

It is said that fixed point theory has lot of applications not in the field of mathematics only but also in various areas. So I am looking for applications in Chemistry only..

26 February 2021 3,533 1 View

Is is possible to pole with corona poling pellets of the sample material instead of thin films?

As it is highly probable that pellets will have a higher degree of air gaps and voids than thin films, is it possible to pole the samples with corona poling nevertheless? Or is there the...

24 February 2021 1,349 1 View

Can I ask did any good platform or journals for learning the calcluation on the reference governors and command governor?

Recently I face some problems with the mathematical ( calculation) on the reference governor and command governor, so I need some help from you all to get which platform or journal can let me...

23 February 2021 7,746 2 View

Special issue on PLS-SEM in Mathematics. Are you interested?

21 February 2021 5,601 3 View

What is the better software for approximation of 3D surface with equations?

I have a massive of x, y, z coordinates of 2D surface in 3D space, which builded in Ansys HFSS or AutoCAD. How can I get the analitical aproximation of this surface by formulas?

21 February 2021 3,444 7 View

How can I obtain a sine function along a path with known equation?

I have a symmetric airfoil with known equation. Now a sine function passes along the airfoil equation like following figure. I want to find the sine function in (x,y) coordinate system.

17 February 2021 1,594 12 View

Does learning mathematics exclusively improve cognitive abilities?

Teaching Mathematics at school to all students is commonly justified by the opinion that it improves their problem-solving skills and "makes them smarter" (whichever measure is implied by this). I...

15 February 2021 7,391 7 View

How do you interpret theoretical vs. experimental reaction orders with respect to a reactant?

I recently came across a paper focusing on the hydrodeoxygenation of oxygen-containing compounds. The paper linearized the rate equation in order to determine the experimental reaction order with...

14 February 2021 8,254 2 View