Can i use a non uniform stiffness tensor in COMSOL ?

Hello, I want to simulate the propagation of some guided waves in plates, with spatially dependent stiffness tensor. Can do that with COMSOL. Thank you in advance, I am new to COMSOL, and I...

31 December 2019 7,520 1 View

What is the magnetic field due to a moving current element ?

Hello To start off, the question deals with non relativistic system. It is known that Biot-Savart law gives the magnetic field at position r (the position of the observer) , created by a...

08 September 2019 827 4 View

Boundary condition on a solid surface under traction/compression ?

Hello, I have a block of solid material in which an elastic wave is propagating. On one side of the block I maintain a static surface stress (the agent causing this stress is external to the...

06 July 2019 438 8 View

What is the induced EMF in a stationary coil by a moving current source ?

Hello, The real problem is : I have magnetic material (magnetized) that is deforming in time (let's say, because of vibration) with respect to the reference frame of the lab, I want to know,...

03 April 2019 2,808 3 View

Phase shift between, current, E field, and B field ?

Hello, I have a wire with AC current : ## Ohm's law gives : J = \sigma E J : the current density \sigma : the electric conductivity E : the electric field From this equation it is clear...

03 April 2019 5,542 3 View

How do we determine the number of electrons of an atom ?

Hello, Are we (me excluded) sure that an electron is a particle ? If not, is its nature "countable" ? Today if someone asks you to show them (experimentally of course) what is the number of...

01 February 2019 7,516 7 View

How does a static/moving electric charge maintain its field ?

Hello, Suppose I have a charge at rest, my question is, since the electric field of this charge will "go" to infinity for eternity, where does the energy come from to maintain that field. We all...

11 December 2018 4,481 20 View

What is the mutual induction between a coil and plate ?

Suppose I have a coil placed above a conducting non magnetic plate, I run an AC current in the coil, and I want to know what is the mutual induction between the coil and the plate ? Thank you in...

11 December 2018 9,707 3 View

How to invert the electromagnetic field to get the current source ?

Hello everyone Suppose I have the next example (see figure) : I have two experiments : I know the input current in the first coil, and from it I compute the induced current in the second coil...

10 November 2018 7,695 4 View

Does the motional electric field verify Gauss's Law ?

Hello, I have a problem understanding Gauss's law for electric field. I know that, if I have a distribution of static charges, the divergence of their electric field is equal to the charge...

09 October 2018 1,493 0 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

Energy minimization in LAMMPS using NVT ?

How do I do energy minimization in lammps with NVT ensemble ? I am using the following command and it does not seem to work. It stops at extremely high energy and gives me the error zero search...

01 March 2021 2,294 3 View

Why is the sum of the elements in a row in a Q matrix equal to zero?

When explaining substitution models, the substitutions are expressed as Q matrix. Why is the sum of the elements in a row zero?

28 February 2021 3,864 3 View

What are the application of Fixed points thoery in Chemistry.?

It is said that fixed point theory has lot of applications not in the field of mathematics only but also in various areas. So I am looking for applications in Chemistry only..

26 February 2021 3,533 1 View

Can I ask did any good platform or journals for learning the calcluation on the reference governors and command governor?

Recently I face some problems with the mathematical ( calculation) on the reference governor and command governor, so I need some help from you all to get which platform or journal can let me...

23 February 2021 7,746 2 View

Why the CHi^2 is close to zero with a bad fitting but the Rp and Rwp are still high?

I am refining my XRD data using in FullProf program. The intensity of the modulated X-ray peaks is almost flat. I tried to adjust the peak intensities but unsuccessful. What is the reason? I guess...

23 February 2021 2,304 4 View

Can we use a compensation matrix with single staining that the negative population for each single staining is below zero?

Recently we used single staining to make a compensation matrix. But, for each single staining we saw that 13 to 25 percent of our negative population had been shown below Zero. In this situation...

21 February 2021 9,982 2 View

Special issue on PLS-SEM in Mathematics. Are you interested?

21 February 2021 5,601 3 View

What is the better software for approximation of 3D surface with equations?

I have a massive of x, y, z coordinates of 2D surface in 3D space, which builded in Ansys HFSS or AutoCAD. How can I get the analitical aproximation of this surface by formulas?

21 February 2021 3,444 7 View

How to compare means of continuous data with zero-inflation and skew?

I have two groups (unpaired) of plant biomass measurements and want to know whether there is a test that can be used to determine statistical significance where assumptions are not violated. The...

18 February 2021 1,258 4 View