In proton NMR 400Mz but Carbon NMR 100 Mz what is the reason?

More Sreenath Pappuru's questions See All

Can someone please share some materials related to applications of coalition games in machine learning and predictive analytics?

Can someone please share some materials related to applications of coalition games in machine learning and predictive analytics, energy optimization or some industrial applications, plants etc.?

07 September 2020 4,545 3 View

Can someone suggest me few papers in which the output of a machine learning model is fed to a constrained optimization problem?

Can someone suggest me few papers in which the output of a machine learning model is fed to a constrained optimization problem to determine control variables of a process?

27 May 2020 5,149 2 View

Bryophyte name status?

Hello my dear researchers I have small doubt in name status, for Ex name: Bryum capllare name is synonym to Ptychostomum capillare but Bryum capillare var capillare is still unresolved name in the...

08 April 2020 5,952 1 View

Can someone suggest me some research papers related to Learning Systems, including online learning, statistical/optimization methods for learning?

Online learning Statistical and optimization methods related to learning Machine learning implementation

31 January 2018 9,046 4 View

Can someone suggest me some research papers related to mean field analysis and its application in estimating survival probabilities of populations?

Mean Field Analysis

07 November 2017 912 3 View

How to do Monte Carlo simulations of a simple branching process?

Extinction probability and expected number of progeny are to be calculated at the end

21 July 2017 9,158 3 View

Case study on water pipe failure?

i need a case study topic about water pipe failures

18 April 2017 6,478 2 View

How can I draw an equivalent RLC network to a metamaterial absorber?

I designed a meta-material absorber in HFSS. But i don't know how to draw its RLC network and how to find out the RLC parameters. And how to prove this absorber exhibits meta-material...

22 June 2015 2,020 3 View

Optical Limiting of Organic materials

Does optical limiting threshold changes with incident intensity or a material has a single optical limiting threshold value?

01 January 1970 8,743 3 View

Is There Any Feasible Method To Test Fluorescent Compounds Other Than Fluorescence Spectrometers ??

Is There Any Feasible Method To Test The Efficiency Of Fluorescent Compounds Other Than UV Spectrometers ? Suggestions Would Be Appreciated !

02 March 2021 5,785 3 View

How do I determine the degree of polymerization of PEG 400 based on NMR integration?

Hello, I am working on the photocatalytic degradation of PEG 400. I would like to know if it's possible to determine the degree on polymerization based on NMR integration, or by the MW of the...

02 March 2021 6,186 3 View

Do you know any MR image dataset?

I would like to research on MR images (0.5T and 3T). Can you please suggest some websites that I can download dataset including both 0.5T and 3T MR images? Thank you.

02 March 2021 7,735 3 View

What could be some reasons why unstimulated monocytes are getting activated?

Im doing PBMC isolation -> CD14+ enrichment using magnetic beads -> stimulation setup. My negative control is just cells in cRPMI but they seem to get activated over and over again.

28 February 2021 7,883 3 View

Does the circuit modeling for planar monopole antennas using Foster canonical forms give good approximation?

Hi researchers, I am searching for some accurate way to do the circuit modeling of planar CPW-fed monopole antennas. I have gone through the literature where mostly circuit modeling is done using...

28 February 2021 7,016 1 View

How to include original NMR data in a manuscript?

hello. i am junior researcher. I received a comment from a reviewer that he could not find NMR data in my submitted paper. I had included the NMR graph with explanation and formula to calculate...

27 February 2021 734 4 View

Why initial concentration of Pb not the same as calculated one when testing using AAS?

I am currently doing research on the adsorption of heavy metal using magnetic reduce graphene oxide. I use AAS to determine the concentration of the heavy metal. I prepare the Pb solution with...

26 February 2021 9,580 4 View

Is this the write procedure for acid digestion of soil for heavy metal analysis using AAS?

How to do acid digestion of soil sample with 3:1 aquaregia in an open vessel?

23 February 2021 3,053 7 View

How can I simulate the optical absorption spectrum of a biomaterial (like DNA or protein) in COMSOL?

I need to simulate the optical properties of a biomaterial, namely DNA, in COMSOL. Basically I need to simulate the IR absorption spectrum of a cylinder filled with a 'concentration' of DNA. I am...

21 February 2021 3,043 3 View

How to Study a proton NMR of Graphene prepared by Electrochemical Exfoliation technique?

I performed a Proton NMR of graphene powder prepared by electrochemical exfoliation technique. It shows some peaks. But I can't understand it.

21 February 2021 8,947 3 View

Mónica Díaz-Fernández

You got it! In fact the value for the gyromagnetic ratio of 1H is 42.576 MHz/T and for 13C is 10.705 MHz/T. So, as you can see γ1H/γ13C is practically 4.

This is the reason why 13C precesses at 1/4 of the proton's frequency.

Sudarsan VenkatRamani

Check this discussion:

https://www.researchgate.net/post/why_13C_NMR_is_done_at_lower_frequency_as_compared_to_1H_NMR

Sreenath Pappuru

Many thanks Dear Fernández for your clarification.

Dear VenkatRamani thank you for your valuable help.

Özgür Alver

It is because of Larmour frequency of the mentioned nuclei for a given magnetic field.

Thank you Dr. Özgür Alver.