# Recent content by hamzaaaa

1. ### Molecular mass of He+MON and He+MMH

But why to take the average and why not the sum of all three?
2. ### Molecular mass of He+MON and He+MMH

Dear all I have a case. I have two tanks, one is filled with Helium gas and monomethylhydrazine(MMH) and another tank with Helium gas and Dinitrogentetraoxide(MON). Both tanks are at 47degC so they are in gaseous form. I want to know what will be the Molecular Mass of the gas. The...
3. ### Area under the curve of a roll data of satellite

No meaning of degree seconds that I think of
4. ### Area under the curve of a roll data of satellite

Dear Members, I would like to ask if we plot the Roll data of a satellite in degrees vs. the time, and if we take the area under the curve of this roll will give something meaningful? Looking forward for your reply. Regards,
5. ### Reaction wheels

What i want to know is that a satellite having a spinning momentum wheel on 1 axis with constant angular velocity doesn't cause rotation on the satellite itself? But if the wheel speed is increased or decreased it will cause satellite to rotate. Is it explainable with any equation?
6. ### Reaction wheels

But for a geo satellite it has an angular velocity equal to earth's rotation,right? So the angular velocity is not zero but constant. This angular rotation is provided by the wheel?
7. ### Reaction wheels

Dears, I would like to know a basic thing, why does the Satellite doesn't rotate with the spinning wheel momentum wheel inside it?
8. ### How to get longitude from Two Line Element (TLE)

Dear All I want to know the formula to extract the longitude of the satellite from the TLE below. I hope someone can help. Thanks 1 24652U 96063A 97251.85429118 .00000144 00000-0 00000-0 0 568 2 24652 0.0850 104.0202 0008355 303.2059 279.6585 1.00288964 3492
9. ### Difference Between Plasma and Radiation

Yes normally when we look at the two effects we talk about plasma and radiation. But another thing I don't understand is Van Allan Radiation Belt. The name says its a radiation belt but it is a constituent of plasma. And then there is another plasma sheet which trails at the dark side of the...
10. ### Difference Between Solar proton event and Coronal mass Ejection

Hi All Whenever there is a solar activity two things are mentioned, SPE, CME and X-ray. Does anyone know the difference between SPE and CME? I couldn't find a descriptive or convincing answer on these two. What particles are associated with CME, is X-ray a part of CME? And what effects could...
11. ### Difference Between Plasma and Radiation

Hi all In general sometimes we talk about plasma effects on satellites and radiation effects on satellites. Can someone tell the difference between the two? Thanks and Best Regards Hamza
12. ### Silicon solar cell degradation due to solar fluxes

I am trying to find the Absorbed dose for Silicon cells on a geostationary satellite from a period of (1996 to 2005) The Equation I have is: D(rad) = 1.68e-8 *((1/ρ)*dE/dx) * Phi Where: D is absorbed dose and units are (100 ergs/g or 0.01 J/Kg) (1/ρ)*dE/dx = (MeV*cm^2)/g...
13. ### Full Motion Antenna motors designing problem

Thanks for your reply. I am a satellite engineer basically but I do have some mechanical background. And this is my first time to work on motors. Initially I can keep a accuracy of about +/- 1 degrees. I just want to know how can i theoretically design a motor for the required movement of...
14. ### Full Motion Antenna motors designing problem

Dear All I want to design a Full motion Antenna. But I want to start from the scratch. Suppose I have a 1m parabolic Antenna and I want to install two motors (Elevation and Azimuth) The motors should be DC. And I want to know how to calculate all the parameters required to move the...
15. ### Thermal Resistance at a single point

wow..pretty interesting to know this.