tech99's latest activity
-
tech99 replied to the thread Can you get pulled under a train?.What caught me by surprise was that although the ship was stationary, the flow of the tidal stream caused suction. -
tech99 replied to the thread Visualize Electromagnetic Fields from Dipole Antennas.It is incredibly interesting. I have plotted actual fields in this way using models. It looks rather as if your dipole is terminated in...
-
tech99 replied to the thread Can you get pulled under a train?.I have noticed the effect when sailing a little boat near a large tanker, which was anchored. As a fast tide was flowing between us, I...
-
tech99 replied to the thread Engineering Full bridge circuit with inductor and resistor.I understand that for switched mode power supplies, the choke input filter is more possible because the frequency is high.
-
tech99 replied to the thread Engineering Full bridge circuit with inductor and resistor.The choke input filter is an excellent circuit because it has good regulation under load and uses the transformer efficiently. With a...
-
tech99 replied to the thread Graduate Detection of hot spots with a thermal (non-radiometric) camera.I suspect the camera has an automatic exposure adjustment, so that the dynamic range can be accommodated, and which will prevent...
-
tech99 replied to the thread Dissolving silver.Also just to mention that silver compounds should not be put into the drainage system as it is very toxic to plants and animals.
-
tech99 replied to the thread RF magnetic field generation.In principle, the coil can be made to present an impedance of 50 Ohms resistive by using two capacitors. The actual loss resistance of...
-
tech99 replied to the thread RF magnetic field generation.The amplifier is able to operate into any load safely, and has ample power available, so i would try a direct connection first.
-
tech99 replied to the thread Undergrad Mechanism of Energy Conservation in Zero-Amplitude Sum of EM Waveforms.It seems that you have two in-phase sources of radiation spaced apart. So you have an array. The energy absent from the minima will be...
-
tech99 replied to the thread Graduate Simple math model for a Particle Image Velocimetry system.The radar cross section of a sphere is simply pi r^2, its cross sectional area. The energy hitting this area is then reflected...
-
tech99 replied to the thread A practical way to vaporize fuel for high MPG?.I am not sure we see unburnt fuel in a modern spark ignition engine, so I am doubtful abut the advantage of pre-vapourising the fuel.
-
tech99 replied to the thread How Does Jaguar's 1980s V12 Dual Coil Ignition System Enhance Spark Strength?.It is a puzzling circuit because the capacitance of the idling secondary can only affect the primary windings. But my hunch is that it...
-
tech99 replied to the thread Frequency Comb (Photonics, Optics).How would the individual lines in the comb be modulated with different data streams? As you may know, the technique is used for digital...
-
tech99 replied to the thread Undergrad Does Poisson's equation hold due to vector potential cancellation?.I presume the charges are accelerating and so would seem to radiate in the directions 45 degrees to the axes and zero along the axes.