How to find degree of deacetylation of chitosan colorimetrically?

I am working with low DD% chitosan. It doesn't dissolve completely in acidic solutions. How to calculate the degree of deacetylation by potentiometric and acid-base titration, UV spectroscopic...

27 January 2021 8,532 2 View

How can one determine the cause-effect relationship between two variables using linear/logistic regression analysis?

Isn't bi-directional effect/causality difficult to demonstrate? Could it be simply demonstrated by examining correlation, regression or any other metric to measure the goodness of fit? How can one...

17 August 2020 6,717 5 View

How to find if one sentence is negative of another using NLP ?

I have to do a project in which using the product description of any product at any e-commerce website and comparing it with all of the reviews of the product.I have to find out if the description...

26 February 2020 3,419 3 View

TLC cutting made easy, will it make TLC Cutting really easy?

I developed a device for cutting the TLC plates. This is my new invention and this design is registered. I wish to commercialize this product. Please let me know if it is useful for daily...

12 March 2018 4,598 14 View

What is the significance of Rf value of organic compounds in medicinal chemistry ?

Rf values (TLC and HPLC) are used to identify the drug molecules. However this information can be of great value in medicinal chemistry and drug discovery. I think there's a great correction...

30 December 2017 8,826 11 View

What is the standard procedure for Reverse Phase column chromatography?

12 March 2017 193 12 View

Can I convert ester to nitrile in one step?

Dear all, I want to convert an ester to nitrile in one step. My structure contains base labile groups so I cannot use ester amine procedures. Is there any method through which I can easily convert...

09 January 2016 2,453 19 View

How can we find Lattice parameter from XRD plot ?

I have new compound whose JCPDS not reported & i want to calculate lattice parameter.Please tell how i can calculate it from XRD or by other method..

16 December 2015 1,297 7 View

No title

04 October 2013 6,034 8 View

How to remove ammonium chloride from a reaction if the compound is water soluble?

I am performing a reaction in which I am adding ammonia in a solution containing acetyl chloride and my starting material. I get my final product with ammonium chloride. The final product is...

27 July 2012 4,370 16 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 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

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

Polymer composites suddenly solidifies?

I am making polymer composite by solvent mixing method. When I am trying to add filler solution in polymer solution it quickly get solidified. How to make them then uinform? It doesn't give time...

03 March 2021 7,540 4 View