Recent content by Behrouz

Hello, I'm looking for the governing equations for the laser radiation on a surface. I understand there are several types and methods. I was wondering if there is an equation to show all the parameters in calculating a surface temperature after laser radiation for a specific time. Some of the...

I'm trying to make a magnetic globe (magnetic from outside) with diameter of about 30 cm. Please imagine it as a snow globe, while it is magnetic as well :). I'm wondering about the options to make it, as light as possible. Please feel free to suggest tags here, if I'm missing anything or I...

Hello, I have a signal and got the FFT result of that. I have shown them both below along with the MATLAB code. May I ask if there is any method to find the time zone(s) in the signal that a specific frequency has(have) happened? The reason I'm asking this is that I want to specify the time...

Thank you all. No, it wasn't specifically for DFT. I believe @FactChecker 's answer is what I was looking for in this case. Thanks again.

Thanks. I mean the effect of different amplitudes (for similar frequencies) in the same FT.

I understand that the Fourier transform is changing the domain (time/space) to frequency domain and provides the sin waves. I have seen the visualizations of Fourier transform and they are all showing the transform results as the list of frequencies and their amplitude. My question is, what if...

Thank you all. I can this the beauty of nature in balancing the 'assets' of molecules at each moment; The summation of velocity, distance from the centre of the earth, and 'vibrations and bumping to other molecules around' should be constant. Fair enough :)

Thank you.

Thanks again. The reason I asked about concept of pressure in Bernoulli is that in Bernoulli, each section has energy nature (i.e. Potential, Kinetic, and, Pressure energy). Potential and Kinetic energy is understandable to me, but not Pressure energy. With your explanation, I'd assume the...

Thank you, that makes sense. But please kindly note that Bernoulli's theorem refers to in-compressible fluids.

Hello everyone, In Bernoulli's theorem, I understand Potential energy (because of height) and Kinetic energy (because of velocity), but I don't understand pressure [energy]; Is it something like the vibration of molecules and bumping them into each other (in simple words). Any help or simulation...

Dear Jonathan, Thanks for your response. I was looking for the meaning of 'Charge', not the way it is used in electricity or 'electrical' charge, but the reason behind the 'Negative' and 'positive' definitions for physical particles. I believe the second part of your answer is helping me in...

Hello drvm, Thank you so much for your complete answer to my question. It gave me a lot of information and a new way of thinking about that. I appreciate it. Regards, Behrouz

Hello merlin, Thanks again for your kind help and advice. I have decided to test the idea on a vacuum container and I'm going to try some different materials (first by computer mechanical analysis of pressure vessels). May I ask the formula you used which resulted in displacing 64 m3 of air...

Hello everyone, I'm sorry if it's a dumb question, I'm very new in self studying particle physics. May I ask when we associate a charge (i.e. positive or negative) to quark and lepton, is it only because of their attraction or repulsion toward each other? in other words, is it just to name one...