--- Log opened Thu Oct 31 00:00:49 2019
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04:47 < nsh> .t https://www.realclearscience.com/quick_and_clear_science/2019/10/30/new_lithium_ion_battery_design_could_allow_electric_vehicles_to_be_charged_in_ten_minutes.html
04:47 < nsh> doesn't seem to be entirely bunk
04:47 < EmmyNoether> New Lithium Ion Battery Design Could Allow Electric Vehicles to Be Charged in Ten Minutes | RealClearScience
04:47 < nsh> "In their paper, they describe an Asymmetric Temperature Modulation method for charging a lithium ion battery. Here, the battery is rapidly heated to around sixty degrees Celsius (140?F) and held at that temperature during charging (facilitating energy transfer) then discharged at cooler temperatures. The method permitted them to charge large-scale cells, modules, and battery packs used in today's electric vehicles to 80% of their capacity in a little
04:47 < nsh>  less than ten minutes."
04:48 < nsh> "The key to the engineers' success was achieving swift heating, An inexpensive self-heating nickel foil installed on the batteries permitted heating from room temperature to 140?F in just thirty seconds. High temperatures prevent lithium plating from forming, but they also cause lithium ion batteries to degrade. However, since the batteries didn't remain heated for long  - just ten minutes per charge - the negative effects were inconsequential.
04:48 < nsh>  The batteries the researchers tested retained an impressive 91.7% of their capacity after 2,500 charge cycles, which equates to 500,000 miles of driving distance."
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05:46 < nsh> --
05:46 < nsh> We explore the use of cylindrical metasurfaces in providing several illusion mechanisms including scattering cancellation and creating fictitious line sources. We present the general synthesis approach that leads to such phenomena by modeling the metasurface with effective polarizability tensors and by applying boundary conditions to connect the tangential components of the desired fields to the required surface polarization current densities that
05:46 < nsh> generate such fields. We then use these required surface polarizations to obtain the effective polarizabilities for the synthesis of the metasurface. We demonstrate the use of this general method for the synthesis of metasurfaces that lead to scattering cancellation and illusion effects and discuss practical scenarios by using loaded dipole antennas to realize the discretized polarization current densities. This study is the first fundamental step that
05:46 < nsh> may lead to interesting electromagnetic applications, like stealth technology, antenna synthesis, wireless power transfer, sensors, cylindrical absorbers, etc.
05:46 < nsh> -- https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.165418
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09:04 < kanzure> hmph
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--- Log closed Fri Nov 01 00:00:50 2019