How to separate a mixture of organic acids by HPLC?

I would like to develop a method for analysis of many organic acids in the same time. how to separate the chromatographic pics of each one?

09 September 2020 9,128 6 View

What internal standard can be used for the analysis of amino acids and organic acids by HPLC (wath ever the type of HPLC used)?

I want a list of internal standards can be used if it is possible

06 September 2020 7,224 4 View

How to find the right number of integration points in second order 3d finite elements?

I am familiar with finite element simulations and numerical schemes like the Gauss Legendre quadrature. I also know that the Gauss integration yields exact values for polynomials up to degree 2n-1...

27 February 2021 6,818 3 View

How can we determine the positive definiteness of multivariable polyomial? Is there any MATLAB function available for that?

Can we check the positive definiteness of a multivariable polynomial using MATLAB functions? Of course in literature, there are few complex methods that use tensor algebra. However, before going...

16 February 2021 1,218 3 View

Infinite order of Laguerre?

If Lmn(x) is the Laguerre polynomial of order m and degree n Is there a means of computing Lmn(x) for 1) m goes to infinity 2) n goes to infinity

08 February 2021 6,320 4 View

What are the conditions on projection operators in order to have optimal L^2 numerical estimates?

Mixed finite element methods employ numerical spaces that are, most of the time, something different than the full P^k spaces (polynomials with order up to k). For example, the BDM_k spaces for...

04 January 2021 2,009 2 View

How to apply a transient External wall temperature bounday condition to Fluent, using a single polynomial of five degrees?

I have a 5th order polynomial of transient external wall temperature. I need to apply a transient wall temperature Boundary condition to Fluent. Please help me in applying it to apply it in fluent.

25 December 2020 1,231 10 View

When k[x,y] is flat over a certain subring?

Let k be a field of characteristic zero and let a,b,c,d belong to k[x,y]. Assume that k[x,y] is flat over R_1=k[a+c,b+d] and over R_2=k[a-c,b-d]. Is it true that k[x,y] is flat over R=k[a,b,d,c]?...

20 December 2020 6,233 2 View

I would like to have a person that helps me in the traduction of my articles?

01 October 2020 7,771 5 View

Do the deterministic polynomiality and non-polynomiality characteristics of this method prove efficiency?

Dear Researchers, I proposed a new method, called Optinalysis, for symmetry detection, similarity and identity measure between two automorphic or isomorphic graphs. I tested the method using the...

10 August 2020 5,020 1 View

How to linearize a phase shifter?

Hi, I have a phase shifter design that produces phase shift with applied voltage, which follows a function that could be very closely approximated by a second order polynomial. However, the...

11 July 2020 8,967 2 View

Is it possible to create an analytical expression from the artificial neural network toolbox in MATLAB?

Is it possible to create an analytical expression from an artificial neural network toolbox in MATLAB? If not, then how can these datasets be used as objective function in optimization? In some...

10 June 2020 5,753 8 View