Why did i get other spot on tlc of phenolic acid i got from preparative tlc?

I did preparative tlc of extract and i got a band of phenolic acid (confirmed by FeCl3 1% spray reagent). The compound uv vis spectra resembles chlorogenic acid spectral, but when i did tlc of the...

30 September 2020 4,528 2 View

What is mobile phase for very polar coumarin to use for Column Chromatography?

I have a fraction that i got from Vacuum liquid chromatography with ethyl acetate:ethanol:water (100:26:1). The fraction contains of coumarin in a low Rf value (checked on tlc), so i decided to...

09 August 2020 5,317 6 View

What is the best solvent to recrystillize a polar coumarin?

I got a fraction contains of two or more compound by vacuum liquid chromatography with ethyl acetate:ethanol:water (100:26:10). The fraction was evaporate and i got chrystal mixed with brown semi...

07 March 2020 656 7 View

In frequency domain alpha band(8-16hz), beta band(16-32hz), gamma band(32-64hz), sub-band(64-128hz) are same as LL,LH,HL,HH in wavelet decomposition?

I am working on single trial motor imagery data i.e. EEG data. I am following a paper which has a dataset from BCI challenge IV (dataset 2b). After removing noise and extracting all the data from...

23 February 2021 5,503 1 View

Suppose we have a banana seller cart consisting of 4 wheels, weighing about 300 kg. How much torque motors are needed to pull of push it electrically?

I am thinking of electrifying the street food carts while harvesting energy using solar panels on top.

22 February 2021 4,323 3 View

How do you integrate the 'friction' variable Xi in the Nose - Hoover Thermostat in order to apply it to a molecular dynamics simulation?

Everything tells you the derivative of Xi, but not how integrate the value to implement it into a simulation. How do you do this?

21 February 2021 6,481 1 View

How to implement boundary conditions in Abaqus contact problems?

Hello I am trying to simulate crawling motion of a bilayer beam using Abaqus. Kind of similar to this: https://youtu.be/os-Z3ucoFpA I am using multiphysics enabled (diffusion, deformation,...

20 February 2021 2,916 1 View

Trouble shooting with his tagged protein expression in E.Coli?

i have issues in expressing a chicken protein in BL21 cells with his tag. I do not see induction even at 18 degrees. Any suggestions

15 February 2021 8,939 3 View

Can you please suggest me how to convert EDF file into Mat file for EEG datasets?

Hi sir, 1.can you please suggest to me how to convert the EDF (European Data format) file into a Mat(Matlab) file for EEG datasets?. 2. Also suggest some publicly available EEG Motor Imagery...

15 February 2021 7,620 1 View

Is Genetic Algorithm usage for Motor Conception FEA optimization a good choice?

Hi RG community, Like the title shows ,i was wondering if choosing the GA for this kind of Optimizaiton is a good choice? For example we have a population of 100 (for 7-8 Optimization Variables),...

14 February 2021 1,160 7 View

How to interface ANSYS Maxwell and Matlab?

Dear All, I am working on electric motor design in Ansys Maxwell. I have written optimization code in MATLAB. I want to run this code in ANSYS MAXWELL and generate FEA results. Does anyone know...

10 February 2021 1,279 1 View

How can I prevent my switching power supply from sudden voltage increases ?

Hi Everybody, I'm currently using a 3kW AC/DC converter which gave 48VDC output(Switch mode power supply). The device is capable to deliver up to 62.5A current to the load. My application is a...

08 February 2021 7,642 4 View

When to use Darcy or Fanning friction factor in frictional pressure drop measurement?

04 February 2021 6,174 3 View