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jim moore
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Here is a link to company designing modern steam engines. I think they would be ideal for combined heat and power in a RC. http://www.cyclonepower.com/
Toggle Commented Sep 2, 2010 on LINKS: 2 SEPTEMBER 2010 at Global Guerrillas
The main problem I see with the Planar Assembly technique is that the plane of assembly is a bottle neck and a place with very limited redundancy. But a Scaffold Assembly Technique would able to extrude an obeject at the speed of the conveyor belt plus a fixed amount of time because the system is bigger. It is also easier to add redundancy to this system. The scaffold can be very simple - an array of ribbons all in tension. (To model your example) You have 100 ribbons 2 cm wide 1 mm thick. Each ribbon moves past a series of cube deposition stations at 2 meters per second. The 3 d array of deposition stations is 3 x 3 x 8 meters. As the ribbons (covered with cubes) funnel down to a one cubic meter box, the cubes snap together forming the object. Total distance traveled ~12 meters or 6 seconds to extrude a 1 cubic meter sized object.
Chris, In the nano-radio, a (charged) carbon nanotube directly turns frequency specific EM radiation (radio waves) into mechanical motion (vibration). This could be a general way to input information and power into nanosystems. By changing the length and / or width of a sheet of graphene you change frequencies of light it absorbs, so there is an easy way to make a wide variety of frequency specific actuators. The main unsolved problem is how to turn the vibration into useful work. Or perhaps a different design could get the carbon nanotube (or sheets of graphene) to rotate rather than vibrate. What do you think of this idea: Charge one end of a carbon nanotube negative and the other end positive. In the center attach the "power" nanotube to a different nanotube perpendicular to the other and free to rotate. The electric and magnetic fields in light will push the positive and negative charges on the nanotube in opposite directions. For the right frequency of light you should be able to get constant rotation in the nano rotor.
Assembly Ribbon Mill ARM - the brainless assembler This design is an attempt to simplify and extend the Planer Assembler design for Fabricating objects. The big advantage of this method is that the assembly ribbon contains the information and provides scaffolding for making an object. (it also effectively disconnects your assember system from the internet) Basic Parts: Building Blocks- 10 microns per side pre made and nano precise. Assembly Ribbon- The ribbon is made of graphene and is~10 nm thick, ~250 nm wide and a ~1.1 meters long. The ribbons have patterns of holes along the length that code for particular types of building blocks or empty space. Deposition Stations - sense the pattern of holes in the assembly ribbon and deposit blocks. Housing - holds the deposition stations and provides structure for the flow of the assembly ribbons. So the process looks like this: For a cubic meter Fabers you will need ~10 billion assembly ribbons to code for the blocks and the empty space that make up the fabricated object. All together the assembly ribbons would make an instruction tape ~1 mm thick, ~25 mm wide and ~ 1.1 meters long. (maybe roll it up in a reel to keep it free of contamination) The Assembly Ribbons are separated and move through a series of building block specific disposition stations (one station per type of building block) that sense the patterns of holes in the ribbon. If they code for the stations block type a block is deposited on the ribbon. The blocks (in an unassembled state) have on one side a grove ~250 nm wide and ~15 nm deep. In the grove there are pattern of rods that can be extended or retracted The rods fit into the holes in the ribbon. There is at least a ~1 micron empty space between blocks on the ribbon. After the assembly ribbons move through the deposition stations they are simultaneously guided by the housing so that the blocks come together in the X-Y plane. Once the blocks attach to their neighbors (in the X-Y plane) the rods that are inserted into the holes in the assembly ribbon are retracted. The X-Y slices of the object are then pulled together as the ribbon is pulled through the groves in the blocks and rewound on a reel. After the assembly ribbons are pulled through the object the rods in the grove on the blocks are extended to fill in the grove. ( one kind of retro future aspect to this design is the ARM could be powered by a hand crank----- pull a reel down off the shelf, feed it to the ARM, crank the handle for a minute or two and out pops a new cell phone, electric bike or what ever.)
Toggle Commented Jul 13, 2009 on Planar Assembly Scale at Responsible Nanotechnology
Here is an interesting question Chris, How small scale is it useful to go with the Planar Assembly design system for making stuff? ~100 nm objects? ~1 micron objects? ~10 micron objects? I guess what I am asking is Do you think it would make sense to use the Planar Assembly design on a smaller scale in order to make a wide variety of meso scale parts? (that could then be assembled into final products.)
I have been thinking "If i had a home faber what would I really want to fab on a daily basis?" Clothing. I have been able to (in theory) get rid of my books, my records, my video tapes which is freeing up a lot of space in my house. Next on the list is the whole dresser / closet - washer / drier and ton of clothing that is in my house. I would like to replace it with a home fiber faber - the clothing would fit my current dimensions, with no seams. Every night I toss the clothing into the recycler, put on my pajamas and pic out what I am using tomorrow. The stuff gets put together overnight and is ready the next day. It would be a parents dream - no laundry - no storing away winter or summer cloths - no constant shopping to get the kids outfits that fit or school uniforms or sports outfits, - no added expense to keep up with holidays and fashion. Still a Fiber Faber would be pretty impressive - it would need to handle different colors, different fibers, different styles, different thickness to the clothing and be able to clean, sort and store fibers from the used clothing. From a nanotech perspective even a very thin fiber has a great deal of design space. (Fibers ~10 microns in diameter and ~10,000 microns long) So there is a huge potential to add functions to fibers over the long run - computing - communications - sensors - actuators - light emitters - energy storage. It possible to envision this as a pathway for incresingly tiny devices get integrated into daily life. (admittedly its not the most obvious pathway, although clothing was critical to the first industrial revolution)
Paul, You don't just need computer code to buld the device you also need software to run most devices. You could make the software that runs the device call "home" to check in to see if you are allowed to use the device. Or you could design devices so that every copy needs slightly different software in order to run. Or software that is keyed to work for one person only. Still non physical, but the software programs that you would need to steal to make and use the device are too complicated for most organizaztions (let alone individuals) to understand in detai. So the question becomes can you trust the device you stole to do what you want it to do, and only what you want it to do?
Toggle Commented May 30, 2009 on Student Nano Interview at Responsible Nanotechnology
Hey Chris, If you did not know a Science Fiction writer you know spilled the beans on the nature of your concern. I will try to be vague in my response. I agree with you, this research is potentially very disruptive to the preexisting ecological relationships between this bacterium and the rest of the ecosystem. And the microbe in question can survive in aerobic and anaerobic conditions, it lives in the gut of most mammals and birds, it lives in the soil and the water. The biggest problem I see is that we know so little about the details of the ecology of microbes. It is very difficult to do ecological research on microbes in their natural environment. Perhaps the way forward is ask the researcher to buy catastrophic risk insurance for the experiments he would like to do. That way he is working with outside experts to asses the nature of the threat. And he can reduce the cost of the insurance by adding protocols that decrease the danger.
Is it correct to think of an entropic spring as being stretched or compressed? Shouldn’t it be thought of as moving from ordered to disordered? I thought that when an entropic spring absorbs energy as it moves to a more ordered state (as opposed to being stretched or compressed) and when it moves back to a more disordered state it returns some (most?) of the energy.