Regarding resonant modes in the frustum. Would there still be resonant modes if;1. the frustum were open on the big end only?2. the frustum were open on both ends?IF I understand these modes correctly, the TExx0 modes resonate with the pointing vector radial in/out-ward from the axis to the walls. It seems to me, that a cone that is open on both ends would still support the same TEnm modes, just not the p modes. Correct?If it's closed at the small end, it should still support odd harmonics of p modes. Correct?Thank you!Todd
Quote from: WarpTech on 06/26/2015 09:53 pmRegarding resonant modes in the frustum. Would there still be resonant modes if;1. the frustum were open on the big end only?2. the frustum were open on both ends?IF I understand these modes correctly, the TExx0 modes resonate with the pointing vector radial in/out-ward from the axis to the walls. It seems to me, that a cone that is open on both ends would still support the same TEnm modes, just not the p modes. Correct?If it's closed at the small end, it should still support odd harmonics of p modes. Correct?Thank you!ToddIt would support TExx modes but they would be travelling, out the end of the device. It wouldn't be a energy store like normal closed cavities, but simply an antenna.https://en.wikipedia.org/wiki/Horn_antenna
I used to be not just skeptical, but, Ahem, hostile, to this idea of superluminal transmission, because of violation of causality, and the appearance that a tachyonic telephone could be constructed.However, upon examining the papers in detail, there is no doubt in my mind that it is impossible to send information using this superluminal transmission. It has been shown a number of times, by different authors that this is impossible, just as it is impossible to use the coherence phenomenon of instantaneous action at a distance to send information. This is precluded by quantum mechanics, in both cases. There is nothing deterministic about the superluminal evanescent wave transmission that can be used to send any information superluminally, as what will be received superluminally will be scrambled up randomly in a non-deterministic way. The signal received at the other end would be incomprehensible and contain no information.Hence I no longer have any problem with this type of superluminal action. Besides the impossibility to use it to send information, the superluminal aspect is restricted to the group velocity and not to the phase velocity, so one has to be careful about the physical interpretation of this superluminal effect.
Moreover the acoustic Helmholtz resonance is the exact acoustic analogue of the microwave cavity Helmholtz resonance (except for the fact that the number of gas molecules is constant while the number of photons is not constant, and the fact that the photon gas has different temperature dependence).The guitar string is not as good an analogue of the the microwave cavity Helmholtz resonance.
I have advance & very agressive prostate cancer. Prostate has been removed along with a 9cm dia cancer mass. Seems they didnt get it all, so I'm back in hospital.Haven't read the forum for days & likely will not for 3-5 more days.
...1. Small vibrations (heat) that are external to the drive's frustum: like a Brownian motor. An inertial ratchet could become buoyant by inducing its own pressure gradient: particles would impart more momentum on the large end than the small end....
Ok guys and gals, I hate to admit it but I'm confused again. I just re-ran rfmwguy's cavity and saved the ex, ey, and ez field components as well as the hy component. (It only took about 10 minutes so no time wasted) But now I am confused about what you all want to see. Had I output the hx and hz components also, (would have been no/little additional time penalty) then there would be 18 possible sets of 312 time slices. x, y, z view of each of 6 components of the EM field as follows.1 - x, y, and z view of the Ex component2 - x, y, and z view of the Ey component3 - x, y, and z view of the Ez component4 - x, y, and z view of the Hx component5 - x, y, and z view of the Hy component6 - x, y, and z view of the Hz componentIts not a big deal to make these data sets but uploading them takes time and can you make sense of that large number of files? I'll make them all and upload them all, as long as Google will give me the storage space but will all that data be useful?
Yes, there in lies the problem. Without looking at what I'm doing how can I learn from it?