Ja tuo kuvan vehje tuottaa jotain 100-50 kW.Koska omavaraistelu kiinnostaa, ja varsinkin metanolilla sähkön tuottaminen, niin pakkohan se oli työntää päänsä syvemmälle kaninkoloon tässä polttokenno asiassa. Tälläinen tuli vastaan:
Kukaan ei ihmetellyt, kun tietoliikenne katkesi Aapeli-myrskyn kourissa ympäri Pirkanmaata, mutta Parkanossa puhelimet toimivat – salaisuus löytyy kennosta, jota on käytetty Nasan raketeissaParkanon taajamassa ja maaseutukaupungin länsiosissa kukaan ei osannut ihmetellä, miten matkapuhelimet pelasivat moitteetta Aapeli-myrskyn pitkän sähkökatkon aikana.www.aamulehti.fi
Ilmeisesti tekniikka on ottanut roimia harppauksia, koska lähemmäs kymmen vuotta sitten nuo linkkimastot sähköistettiin (ainakin virka-apu harjoituksissa) verkkosähkön lamaannuttua tämänkaltaisilla laitteilla:
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muoks: löysin etsimäni pienellä vaivannäöllä
Since World War II, the U.S. Army has used approximately 20 times more energy per soldier while reducing the number of soldiers deployed. This undoubtedly will continue in the future as new capabilities with higher-power weapons, novel sensors and robots, and advanced computing are envisioned. This highlights the importance of energy supply and management for the future battlefield.
When considering Army maneuver, one key objective is minimizing the number of trucks carrying materials to the battlefield. As Army Futures Command explores future autonomous vehicles and active protective systems, the concern becomes less about lost lives (which was a major factor in Iraq and Afghanistan) and more about lost transport vehicles, fuel, water, munitions and other supplies, as autonomous systems would not require the physical presence of a human.
Looking at the transportation fuels used today, diesel, JP8 and biodiesel clearly have the highest volumetric energy density. And this is the most important measurement, as supply trucks generally “cube out” before they “weigh out.
Some sodium battery developers are using activated carbon for the anode, which holds sodium ions in its pores. "But you need to use high-grade activated carbon, which is very expensive and not easy to produce," Sun says.
Graphite, which is the anode material in lithium-ion batteries, is a lower cost option. However, sodium ions do not move efficiently between the stack of graphene sheets that make up graphite. Researchers used to think this was because sodium ions are bigger than lithium ions, but turns out even-bigger potassium ions can move in and out easily in graphite, Sun says. "Now we think it's the surface chemistry of graphene layers and the electronic structure that cannot accommodate sodium ions."
He and his colleagues have come up with a new graphite-like material that overcomes these issues. To make it, they grow a single sheet of graphene on copper foil and attach a single layer of benzene molecules to its top surface. They grow many such graphene sheets and stack them to make a layer cake of graphene held apart by benzene molecules.
The benzene layer increases the spacing between the layers to allow sodium ions to enter and exit easily. They also create defects on the graphene surface that as as active reaction sites to adsorb the ions. Plus, benzene has chemical groups that bind strongly with sodium ions.
This seemingly simple strategy boosts the material's sodium ion-storing capacity drastically. The researchers' calculations show that the capacity matches that of graphite's capacity for lithium. Graphite's capacity for sodium ions is typically about 35 milliAmpere-hours per gram, but the new material can hold over 330 mAh/g, about the same as graphite's lithium-storing capacity.