The calculation of the bandwidth at -3dB, -10dB or -5dB ?

More Zed Bib's questions See All

User defined comsol permittivity diagonal can not change values?

Hello please i hope to change values of permittivity tensor wich is diagonal with different values but i can not i use comsol software help

07 August 2018 6,571 0 View

How to simulate a carbon nanotube to trace the electron dispersion as well as the energy bands using the comsol?

how to simulate a carbon nanotube to trace the electron dispersion as well as the energy bands using the comsol

03 April 2018 5,829 0 View

How saved figures in comsol for used its later?

have a figure on comsol that I want to put it in my article but I do not know how the recorded do

31 December 2016 5,793 0 View

Factorial theoretical structure is linked to likert scale response?

The theoretical factor structure of a questionnaire is linked to its Likert scale response? If I change the response scale this may affect the structure? For example, instead of using a scale from...

01 February 2015 7,198 7 View

How can I validate the qualitative food frequency questionnaire?

Given that the study objective is to seek only the usual food consumption without information on the portions?

01 February 2015 6,147 2 View

How can we use the GMRES algorithm for the following system?

good morningI read the article titled 'SINRD Circuits Analysis with WCIP' we can solve the equation system (10) by the GMRES algorithmSo to use the GMRES we must put the system in the form of...

11 December 2014 9,880 4 View

Is there a classification of foods according to their taste?

09 October 2014 6,274 4 View

What are the periodic wall boundary conditions?

What are these conditions and how can I choose the basis function?

03 April 2014 6,359 3 View

Carbon nanotube and carbon nanoube matamaterial

Is there a difference between carbon nanotube and carbon nanoube matamaterial? Is that the permittivity is related only to the carbon nanotube metamateial or it occurs also when there is a carbon...

31 December 2012 4,345 1 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

What is the characteristic length to determine the Reynolds number for the scattered turbulent fluid flow?

Dear all, I just saw this example in FB on the difference between laminar flow and turbulent flow. The flow from a pipe hits the sink and scattered. The flow from the pipe is characterized as...

02 March 2021 1,999 5 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

How Relativistic effects is one reason for lanthanide contraction?

The Lanthanide contraction which is the decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, is due to poor shielding of the 4f...

01 March 2021 2,272 4 View

What is the density for pva electrospining?

I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is...

28 February 2021 298 3 View

Is there a deep reason for using the squared modulus of the wave function as the probability density of the existence of the particle?

I think we were all surprised at the first time we got to know quantum mechanics that the squared modulus of the wave function is the probability density of the existence of the particle? The role...

28 February 2021 6,282 9 View

Should we reduce the standard unit of length to 0.31951540592 meter ?

The reasoning behind this question is to align the ratios of the proton potential in energy per charge to the speed of light in distance per time. As these two dimensions appear to be related,...

27 February 2021 947 7 View

How do you mesh a thin solid in Fluent?

Hello, I have used the shell function on SpaceClaim to create thin solids for the model I am studying. These are contained within an enclosure for my study. I chose this approach as it avoids the...

24 February 2021 8,856 3 View

No streamlines present in a small region inside a flow. This means exactly what?

No streamlines present means whether the flow is getting obstructed there and the velocity inside the region is zero? Or else, the fluid is trapped inside that region with a nonzero velocity?...

22 February 2021 5,249 10 View