Recent content by whitenight541

Hi all, Given an initial point (longitude and latitude), a distance, and an angle of motion (in the 2d space), how can we calculate the coordinates (longitude and latitude) of the point that lies at that distance in the direction of that angle from the initial point?

I totally agree with you .. but usually complexity comes for accuracy. If accuracy is not required simple equations are formed. right?

I tried reading the PDF and I didn't understand a single word. I think it needs a vast background on geophysical issues. Is there a simple equation for this with simple variables that I can find and assume? I don't need the model to be accurate. Just accurate enough to model the soil in...

Thanks so much for replying. The problem is I'm a computer-science graduate and I don't have any knowledge regarding this topic. I'm not even sure it is called clay (as you stated it shouldn't) All I know is it is a soil suitable for agriculture, the temperature varies from 20 to 30...

Hi all, I'm not sure if this is the right thread to post this topic. I want to simulate soil moisture and how much it decreases given a certain temperature. For example at temperature 25 degrees Celsius , what is the rate of decrease of the soil moisture? The kind of soil is clay suitable...

I have seen that link before .. but I feel that the numbers are very large! Is it possible for such a small battery to store such big amount of joules? Is there any other place that I can validate these numbers from?

Hi all, I'm using NS2 to simulate wireless sensor networks. I want an estimate of the initial sensor battery energy. I know that each sensor node uses 2 AA batteries. I have no assumptions about the current. I search for a while on the internet but couldn't find a direct estimate. Thanks...

The reception sphere is a technique to determine with rays are actually received by a receiver. It constructs a sphere around the receiver with radius proportional to the angular separation between rays and the total unfolded distance traveled by the ray. If the ray lies within the sphere then...

Hi all, I'm confused about the concept of wavefronts in ray tracing .. each ray is considered a wavefront? or what exactly is a wavefront in ray tracing? In the reception sphere, it is mentioned that only one ray should be received from an actual path. I don't get it .. does this mean that...

I don't have a springerlink account .. I would be so grateful if you just posted the refractive indices :) Thanks in advance

so what's you are saying is that i should consider 1 as the reference gain for my reference isotropic antenna and then divide 3/1 (in that way i would have unitless gain). Then i convert the dB to normal scale by 10 ^ x/10. Finally i multiply gain of my antenna by the result right?

I just want to make sure of something: having 3 dbi antenna gain means that the directivity is 2. If I'm using a half wave dipole antenna, then I will multiply the normalized radiation pattern by 2. is this correct?

I want it to model transmission of electro-magnetic waves (not light) .. at microwave frequency 2.4 GHz If it is possible I want the absolute refractive index thanks

Building Materials Refractive Index?? Hi all, does anybody know the refractive indices of these materials (used in houses)? - Wall bricks - Wood (used in doors) - Glass - Plastic - Concrete (in ceiling and floor) and any other common materials :) thanks in advance

This is rather an old thread but I had to ask this question. I lack any experience in antennas so what kind of antenna does this http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps6087/product_data_sheet0900aecd806351fc.html" has? and what's its gain radiation pattern? (popular...