Use of Sine voltage source in Electrical circuit with frequency domain study in COMSOL?

Dear Sir/Madam I want to use Sine voltage as a source in an RLC circuit. I want to study the driving point impedance with frequency sweep. But when I use sine voltage, I get an error like The DAE...

13 January 2021 9,826 5 View

How to find Inverse Laplace of a large matrix in MATLAB?

I am trying to find out the inverse Laplace transform of the state transition matrix obtained using inv(S*I-A). Where I is the identity matrix, and A is a state-space matrix(24x24 matrix). I have...

21 December 2020 7,041 3 View

Why does not graphene exist as a proper 2D sheet?

We know that graphene is the strongest material as it has high tensile strength. Then why does it exist as flakes? Why we cannot make a complete sheet out of graphene?

18 May 2020 8,820 4 View

Which book is best for electrochemistry?

To understand the electrochemical phenomenon undergoing at any interface, which book I should follow?

20 April 2020 2,979 21 View

What are the initial values of different ion concentrations?

What are the initial values of different ion concentrations(Electron,+ve and -ve) should be taken while simulating the partial discharges between different electrodes(point-plane, point-...

11 March 2020 6,325 4 View

How to separate r and s isomers of tetrahydrofuroic acid by normal phase chromatography?

I want to separate the r and s isomers of the tetrahydrofuroic acid by normal phase chromatography.i have taken many trials on many columns such as chiralpakADH CHIRALCEL OJ-H many chiralpak...

20 December 2019 2,093 1 View

How to take photos of the bacterial culture plates and flasks and bottles with a dark back background for a clear image?

How to take photos of the bacterial culture plates that I can present in my paper or powerpoint presentation?

29 September 2019 9,298 1 View

How to separate the diastereomer peak from main peak?

My diastereomer peak is coming just after my main peak and also the main peak has tailing in it and the diastereomer peak is comin with the tailing in reverse phase HPLC system.I have attached the...

18 June 2019 2,456 10 View

Has anyone seen any pellet after isolating exosomes by ultracentrifugation?

I have isolated exosomes from conditioned cell culture supernatants, but have not witnessed any pellet after two steps of ultracentrifugation. Is it normal or should I must see some pellets? Any...

21 April 2019 5,102 5 View

How to add/create antenna block in simulink(Matlab)?

please site 1-2 examples

14 March 2019 2,711 2 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

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

What are the values needed for gabor filter's parameter for cifar10 data?

Hi, I implemented a code to gabor filter cifar10 data but the images after being filtered and stacked are not clear like the original images. I think the problem is in the way I am using the...

03 March 2021 6,317 1 View

How to increase a model accuracy ?

dear community, my model is based feature extraction from non stationary signals using discrete Wavelet Transform and then using statistical features then machine learning classifiers in order to...

03 March 2021 6,994 5 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

Arena simulation - how do i model the following model in ARENA (see description) (new to ARENA)?

Hello, I'm fairly new to ARENA and I have the following problem: I have two queues in which, in each queue, a different order type arrives (both having an arrival rate of exponential 10). Order...

02 March 2021 2,431 3 View

How to repeat an operation on an atom selection for multiple times in PyMol?

Hi, I am trying to construct a multi-layer fibril structure from a single layer in PyMol by translating the layer along the fibril axis. For now, I am able to use the Translate command in PyMol...

02 March 2021 4,569 4 View

How to calculate Total Flavonoid?

I analyzed flavonoid total spectrophotometry, the procedure as below: 2 ml supernatan added 5 ml dd.H2O, then added 0,15 ml NaNO2 5%, 5 minutes later added 0,15 ml AlCl3 10%, After 6 minutes,...

01 March 2021 6,722 1 View