Externet

I do not care for a decent sized station nor making electricity. I just want to know if could heat one home in winters, and I will not charge anyone for 10 years storage of the spent fuel. Then they can have it back.

OK, I will settle for 300Kg; 10 years. Got any spent fuel behind your spider webs ? "After one year, typical spent nuclear fuel generates about 10 kW of decay heat per tonne, decreasing to about 1 kW/t after ten years.[2] Hence effective passive cooling for spent nuclear fuel is required for a number of years." ( from ---> http://en.wikipedia.org/wiki/Decay_heat ) http://en.wikipedia.org/wiki/Radioisotope_heater_unit

Thanks, swansont, skeptic. How does the canisters to store spent fuel prevent the personnel/environment handling them from becoming ill/contaminated/suffer health problems ? I assume their well designed and very tested casks fully shield/contain the harmful radiation but not its heat. Whatever isotopes or chemicals mixture is inside, is kept very confined If so, the heat could be used. And when recently removed from service, spent fuel rods rest in water a while to "prevent radiation from harming nuclear plant personnel" A water jacket added in the "fireplace-replacing hot box" could work too, could it? From reading on the net, they emit heat for years. There has to be a way, setting aside current security matters, to implement its use. Or centralized sites pumping hot water to dwellings ? http://phobos.vscht.cz/konference_matlab/MATLAB06/prispevky/pultarova/pultarova.pdf http://www.ocrwm.doe.gov/factsheets/doeymp0338.shtml WANTED : "Safe hot box containing spent nuclear material" ( A couple of kilowatts heat for 20 years will do it, fireplace size preferred )

Interesting subject, but am ignorant in this matters, please shine some light. For sure there is a bunch of brains dealing with the disposal of spent nuclear material, because of health and political and other reasons, but swansont triggers my curiousity. ..." would need a certain amount of it to have it be hot enough to boil water and"... What does less than a certain amount of spent material does ? Just warms up to say 60C instead of being capable of boiling water ? If such spent material is encapsulated in glass, concrete, shielded in a whatever metal box that fully blocks all harmful radiation; what does it do? Gets warm by itself for a buuuunch of years? I would not mind having such safe hot box instead of my fireplace, or place it in a water filled vessel to make hot water. Just move it out to the backyard in summer. Ok, spank me now...

Bibs on, and enjoy :

Thanks for the replies. Yes, a fragile payload would not survive. Unless the thrusters are driven gently enough to be the gases the ones that would do the initial smoother propulsion with much less fuel payload. The friction could be nearly eliminated, with a loose fit in a vertical bore inside a mountain, or a duct on its slope.

A vertical rocket launch seems to me that wastes most of its initial fuel/thrust as the exhaust is deflected sideways to atmosphere. If such launch could be done from inside a 'barrel' as a bullet in a rifle, its own exhaust gases push would be way, way more efficient. Would it? Do rockets launched from silos need much less fuel to overcome inertia ? Are their combustion gases vented or compressed within the silo until the rocket clears the surface opening ?

Immersing a rusty iron piece in baking soda solution and applying 12 volts electrolytically removes the iron oxide. Many years ago, an expert told me that immersing a rusty piece in caustic soda, would prevent from rusting ever again

Hi. Surprised by the efforts to make a car run from a wind turbine. I know it can run, in any wind direction, but how much effort can the university of Stuttgard be putting on such limited contraption ? As an experiment, it's fine. Unsure if will show from this link; I had difficulty locating the program, and may correspond to another link next days : http://www.dw-world.de/dw/0,,3062,00.html Aired 17.02.2010 on "Tomorrow Today" by Deutsche Welle Hit play video on "Get smarter while you sleep" ; it contains the subject.

Would filling about a centimeter of the pipe mouth with silicone sealant work for you ?

I meant that for the tail action, veeeery gently compressing (and expanding) the atmosphere air cyclically to propel forward. The helium too. Barely compressed.

Think out of the box... No tanks , very lightly and gently compressed air : Isn't that beautiful ? Now make yours like a bird...

Am not sure if white light behaves the same on lenses as monochromatic red led. To avoid the curvature of the earth as impediment, imagine a modulated beam of white light hitting a cubic reflector on a geostationary satellite -no clouds:rolleyes:- With a telescope, you could 'receive' the reflection, couldn't you ?

Hi all. How can light from multiple sources be simultaneously directed to a single area/direction ? Is there any unusual -or not- shape of lens/material/coating (cone, dome... ?) that refracts light incoming from any direction and bends/focuses it towards the same spot ? Those "solatubes" installable on roofs gather light from nearly all directions and by its mirrored internal surfaces tube it is 'piped' to a single 'destination' If a chamber had its 4 walls and ceiling covered with light bulbs, what optics contraption could be placed in such chamber so the light hitting the contraption be channelized/ducted/refracted/conveyed to the surface where it stands ? Would a hemispheric lens (flat at bottom) illuminate the surface it rests on with the sum of light incoming from all directions ?

Hi. Perhaps I should sell it. But I will not send it via mail, UPS... Contact me at externet at inorbit dot com Miguel

Not the watch, but I have a kit from the fifties to paint watch hands. It is labeled "Radium" on the instruction pamplet. No clue on its concentration or to confirm what is it; assume it is the regular concentration watches had. It has about 1g. of a pale green powder in a glass vial, some glue to mix it with, sovent, a microdish... A 5 year old post: http://www.scienceforums.net/forum/showthread.php?t=10088&highlight=radium Edited: added----> This is a picture found on the web, like my kit: http://www.orau.org/ptp/collection/radioluminescent/favoritetouchupkit.htm (This has the radium vial missing) Rightmost here: http://www.orau.org/ptp/collection/radioluminescent/radioluminescent.htm

Is there any way to have a 30cm ⌀ source of intense enough white light beam to reach a couple of hundred miles with the least divergence possible, perhaps up to a mile ⌀ ; by 'cheap' methods/lensing/whatever ? A lighthouse fresnel lensing can neatly reach 20 miles; what would it take to make it 200 ? How do airport beacons work ?

A metal box and also a mesh can greatly reduce the passing of radiofrequency, as the window your microwave oven has. Wrapping a house would not be simple. And 'grounding' such may not be fully effective. Having it laid all even under the house may be better. Some people is more sensitive to become paranoic to the subject. Years ago I read research took place by placing very high AC voltage plates directly above and below a large amount of eggs in an incubator, full time during 3 weeks the process takes. No defects were found on the chicks. :eek: Yesterday I heard on Public Radio, that Alzheimer disease was reduced and eliminated in laboratory rats exposing them to 4 daily hours of cell phone radiation, and examination showed that some sort of harmful chemical 'dentrites' in the rats brain were dissolved by the 'treatment' Personally, have no opinion on EMF effects, other than microwaves do cook whatever is nearby. On a very recent post of some forum; a guy placed his cordless phone inside an off microwave oven, and called to it. It rang !!! Some debate about the shielding facts, led nowhere.

What is your DC supply voltage available, what is the ionizer output DC voltage desired, at what current and what polarity ( negative ions or positive ions ) ?

Hi. Landed birds seem to move their heads in jerks, as if their vision would not work well in uniform motion; and at the same time, they are supposed to have good vision moving in flight... Most walking birds keep the head motionless while the body/legs advance, until repositioning the head in advance and repeating. What is going on ?

What would it take to store all that lack of heat from tons of snow and cold days to be released later in the summer; and all that heat from the summer to be released in the cold of the winter ? Dreaming to eliminate the heating/air conditioning costs on dwellings. A basement or a large room filled with thermal masses ? With some 'magic' material with a huge heat absorption coheficient? Plain rocks ? Scrap metal ingots ? The subsoil, at around 40 feet deep, the temperature is a nearly stable all year to somewhere by 55 F. There is no chambers with thermal insulation walls in there; nature works fine. Injecting some fluid in there? Geothermics works. But not everyone has the backyards, the drilling$ ... Any alternatives to make a large thermo ? Dream of how all the snow from city sweepers can be kept until august :-)

Hi, Skeptic. Metal? Say the disc is not metal. The extra effort exerted by the motor is due to overcoming the attraction/repulsion from the magnets proximity. In other words, If a solenoid with a long rod had to pull a magnet away from another; compared to no magnets to act upon... Separating stuck magnets does need a force x distance ÷ time

An electric motor spins a disc with magnets attached. Takes say 10 Watts. Magnets are placed fixed near the disc. The motor exerts extra effort to overcome the magnets that try to brake the disc motion. Motor takes now say 20 Watts to run overcoming the magnetic braking effect. Do the magnets warm up? If it was a free running drill using 10 Watts, comparing to 20 Watts when actually drilling, are the extra 10 Watts shown as heat at the drilling friction action (bit, part drilled) ?

Yes, mercury can behave as a conductor crossing the lines of force of the spinning magnet, 'shortcircuiting' the current generated. Will that generate heat that will warm up the mercury; in the same amount of extra power needed to spin it compared to a non-magnet iron piece ?