Questions tagged [waves]

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Parabolic wave equation for tropospheric propagation, electric and magnetic field definitions

The split step solution for Parabolic Wave Equation (PWE) applied to the tropospheric propagation problem is: $$u(x+\Delta x, z)=e^{ikM(z)10^{-6}\Delta x}\mathfrak{F}^{-1}[e^{\frac{-ip^2\Delta x}{2k}}...
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11 views

Standing wave node counter

I have a an assignment to complete this Term, the assignment consist in making a machine that would produce standing waves in various frequencies, (for example the typical motor connect to a string ...
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1answer
45 views

What emits more radiation, cell network or wifi?

I've researched in the Internet but can't find any conclusive answer. When will your phone emit more radiation, downloading 1 Mb of data from a cell network (3G, 4G) or downloading the same amount of ...
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5answers
103 views

What can be the reason of the constant 50 Hz sound in my home?

I am suffering from a strange hum in my home. I have just bought my home and living in 3 months. A month ago I've started to hear a humming noise. Then, I recorded the sound and looked at its ...
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1answer
201 views

What is the difference between the wave equation and the advection equation?

I am trying to understand what is the difference between the wave equation ad the advection equation? Bot the equation seems to move a quantity. While in literature it is said that the advection ...
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2answers
52 views

How to measure and verify ultrasound frequency and intensity from a cheap ultrasonic body contouring device?

Research shows that applying 1 MHz non-focused ultrasound at 3 W/cm2 may reduce subcutaneous fat thickness. In fact, high-end and expensive (costs $5000 >) HIFU ultrasonic transducers are now being ...
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0answers
33 views

Best way to communicate data wirelessly with specific conditions

So I need two modules to give each other data with the following conditions: They are relatively short range. They need to be near each other to transmit the data, say around 5 cm. They are ...
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2answers
359 views

Why channel 1, 6 and 11 are best for Wifi communication 802.11n?

In 802.11n 2.4Ghz, the spectrum is varied from 2400Mhz to 2500Mhz and consists of 13 (or 14) channels, each channel having 20Mhz band width. When I search google for best channel, all websites say 1,...
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1answer
54 views

Defining camera as a passive radar

Is it possible to define any camera without "flash" (sensible to any band of radio wave) as a passive radar? If so, where could I find references to that? I've been looking all over the place and ...
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0answers
65 views

Possible values of grating constant

I need help with a question regarding diffraction gratings. It goes something like this: Assume that you have a diffraction grating. When you shine light of different wavelength through this grating ...
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2answers
2k views

What device is this, and how does it work?

There is this device I saw when I was a child at a big music store, that makes me curious. It was meant to listen some CDs to try them out before the purchase. You stand under a bell-shape kind of "...
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0answers
52 views

How do I set Reciprocating and Rotation motion in Fluent or CFX?

I want to model the following case(Attached picture) This case have reciprocating and rotation motion. Is it possible that this case models in Fluent or CFX without writing Code? How i set this ...
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2answers
162 views

Vertical wave action on bridge

Rio de Janeiro, Brazil is currently stunned by the fact that yesterday a span of a brand new (innaugurated in January) bicycle bridge along the coast collapsed when struck by a wave, killing some ...