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from what I observe after work in high power radio wave industry, there is a possibility that long time exposure to high power radio wave can have effect on peo
by seanxh 10y ago
from what I observe after work in high power radio wave industry, there is a possibility that long time exposure to high power radio wave can have effect on people's chromosomes, not quite sure what will happen if someone expose too long to this type of device
- nardi 10y agoIn this device, power is not transmitted via electromagnetic radiation, but via oscillating magnetic fields. It's completely safe for humans and any electronics not connected to an antenna tuned to the resonant frequency. EDIT: Obvious in retrospect, but alternating current like this is exactly how you make EM/radio waves, so my comment above is misleading. However, that's the cool part about this research. They are generating quasistatic magnetic fields, and decoupling the magnetic field from the electric field—similar to how near-field charging pads work, but at room scale. So they are producing very little in the way of EM radiation. From the paper: > For example, radiative transfer methods have tightly coupled electric and magnetic fields that propagate over long distances and are typically used for radio communication. These far-field wireless power techniques have not found wide spread use, since they are limited to delivering only a few milliwatts of power due to health and safety concerns. In contrast, non-radiative transfer systems such as inductive charging cradles and resonant charging pads can safely deliver 10s-100s of watts of power by loosely decoupling the magnetic fields–which are used to transfer power–from the potentially harmful electric fields. However, near-field coupling is a highly localized phenomenon and transfer efficiency drops off rapidly as the source and receiver are separated by more than a coil diameter. Likewise, it is not possible to strongly couple coils of drastically different sizes. > Drawing upon recent work using far-field standing electromagnetic waves to generate uniform field patterns in a metallic chamber, we introduce quasistatic cavity resonance (QSCR); which can be used to create near-field standing waves that fill the interior of the resonant structure with uniform magnetic fields, allowing for strong coupling to small receivers contained within.
- jfoutz 10y ago> power is not transmitted via electromagnetic radiation, but via oscillating magnetic fields I don't think you can have one without the other, can you?
- RandomInteger4 10y agoI think you can. Using electricity, you can induce a magnetic field (Electromagnets) and vise versa, using magnets you can create electricity. Like the other commentor though, I'm not very strong with my physics knowledge, so I can't answer for certain, but I'll be reading about it at the gym tonight I think.
- chrisseaton 10y agoCan you read while running on treadmill or something? That's an extraordinary multitask if you can!
- RandomInteger4 10y agoNo, I use the recumbent bike machine.
- nardi 10y agoThat's probably true. I admittedly am pretty bad with basic EM physics. Would love someone to explain this to me like I'm five.
- sverige 10y agoThere are electric and magnetic fields. While you can't have one without the other, one always dominates when those fields propagate. Also, the effects vary depending on distance from the generating source.[1] This article apparently says that they have made a practical way to transfer magnetic energy to inductors (coils) well beyond the near field range.[2] They do this by creating quasistatic magnetic fields within a specific space. The coils within that space react to the magnetic fields the way coils in a circuit would. [1] https://en.wikipedia.org/wiki/Near_and_far_field https://en.wikipedia.org/wiki/Near_and_far_field [2] https://en.wikipedia.org/wiki/Inductor https://en.wikipedia.org/wiki/Inductor
- blackkettle 10y agoSo basically this is the prequel to Children of Men?