Externet

Death by natural causes... ----> What is that ? Should be after a certain age or any age is a candidate ? Is it a product of uncertainty or lack of good forensic diagnosis ? What deaths are by unnatural causes ? Only homicides ?

Thanks. Solved... this, made into a roll ----> http://ecx.images-amazon.com/images/I/61YVaAYcaIL._SL1280_.jpg Sanding screen by 3M ----> http://www.handymanclub.com/Portals/0/Project%20photos/silicone-carbide-screen.jpg

Hi. Trying to build a box/vessel made of silicon carbide, about 12 cubic inches capacity (~125ml). Will be exposed to 300 degrees C. Can be a cube, Can be a cylinder, Can be a pyramid, Can be cup shaped but crucibles are too expensive to play with, Can be made of thin ~3mm 'boards' of grinding disc material like this : ---->https://www.forneyind.com/store/detail/695/masonry_concrete_asphalt_cutting_type_1/6620/cutting_wheel_masonryasphalt_type_1_14_x_532_x_20mm_arbor_c24r-bf/ But cutting its material off to form/make the sides of the box has to be mission impossible. Can be made of carbide sanding paper/cloth, but the backing would burn unless there is one that won't, So far the simplest seems two of these 'mouth-to mouth': ---->http://www.pferdusa.com/photos/1000/206/ETT_C_30_Q_SG.jpg Any suggestions, please?

Hi. Many years ago I was obsessed with the subject and dug deep into the solar methods to obtain freshwater for drip irrigation or human consumption, expandable at any size scale. I found that can be made simple or complex, both tilting the scale of convenience one side or the other for best efficiency or lowest cost, which this latter is very important. A wimpy solar panel operated electric vacuum pump has merit for destillation on modest partial vacuum, increasing productivity by reaching evaporation at lower temperatures, but means batch operation. The pump can also help to move the vapors into a condensing chamber, serving double duty. A way I found important to consider was to avoid batch processing, eliminating salt precipitation and cleanup at the same time. Draining metered brine instead makes it viable, unattended. Heat interchanging to optimize efficiency also plays a role to consider. The fresh water and the drained brine contain heat that should not be wasted : Simple concentric pipes one inside the other can transfer that heat into the cool seawater inlet. That cool seawater inlet also promotes condensation. There is dozens of different devices that can be designed to do the solar distiller. The one I found with most merit and simplicity is ----> http://www3.telus.net/farallon/ I contacted the designer but could not clarify something I was never able to have it clear in my mind, was the need or not of air circulation on the vapors side to transport the moisture to the discharge condenser surface. In other words, the hermeticity or not of the chamber. That design provides full sun strike on one side for evaporation and shade on the other for condensation. It is not perfect as drawn/built, but interesting to polish. The vapor migration to the shade side was a point to improve. Air currents to sweep vapor off the evaporating surface (which can be a black towel) and towards the shaded condensing surface was another item to re-think. This tilted panel also lacks heat exchangers. I would ignore the plant-in-a-bottle scheme. Simplicity is very important. Heliostats are very complex, and too expensive for the final product yield cost. Avoid them. If you could come up with a contraption to distill using discarded materials -say 2 or 3 litres soda bottles ! by the thousands !, it would be a home run. Finally, there is electrodialysis. I believe it was discussed here at SFN a while ago. Please read slowly again as there is much in the above text that can help you.

Hi. Is there a technical reason why the sunlight ducts are mostly shown and installed with a couple of bends as per the picture attached instead of straight up ? ----> http://www.consumerconstruction.com/wp-content/uploads/2011/06/solatube-300x234.jpg

What type of metal open vessel/tray would heat up the most if placed in a microwave oven ? Copper, brass, aluminium, stainless, iron, alloys... and any optimal shape/thickness/dimensions that would make it hotter ? -This is not about susceptor films-

The black hole... ----> http://www.youtube.com/watch?v=RW-WoEV_BFI

Norton, AVG, Kaspersky, Panda, Avira, PCTools, Avast, McAfee, Defender, Whatever... Been running 8 years now with none of the above. Jumped to Linux then. Was a dificult adaptation but managed to stay on it. Will never do windows again.

How come it seldom happens -if ever-, from people that had knowledge of extraordinary secret events, in all branches of politics, science, pacts, crime, wars... is never revealed on post-mortem letters, for the world to know ? There has to be thousands of jaw-dropping secrets carried to tombs that would make revolutionary, helpful, enlightening (and damaging too) historical knowledge; but the subjects involved never revealed during life. Seems that those personalities keep secrecy by some reason, even if not negatively implicated. Would you tell on a letter (with documented proof of evidence) something so important that the public deserves to know after you are gone ? Does ethics play any role here ?

Hi. For a flat bottomed or for a mild V hull; where is more convenient to install a dozen of lead-acid batteries, to obtain the best stability ? As low as possible of course, but in two rows along the sides or a single row above the keel line ?

Somehow, I still remember that from Logic classes at 11th grade... Absurds make funny.

Yes, the pressure at the bottom of a 16 ft. filled pipe will be the same as at 16 ft under the lake surface. But the 'float' will not change its floating force if it is not compressible, as a ping pong ball. If it is a piece of meat that floats at the surface, it will stop floating and sink from a certain depth down.

Very well dressed, or is it just sort of a T-shirt ? Seems a 2014 model, never seen before. It is 1 inch long... Do those colors match any team ? 8 pictures here ----> http://s588.photobucket.com/user/Innernet/library/?sort=6&page=1 -Know what species may be ?-

Thanks. Well, then, a kick-ass 500 W+ strobe lensed downwards, for a flash every 5? seconds when orbiting on the dark hemisphere. Or whatever is feasible. Being NASA, ESA and the Russians, provide more doorways for the proposal. Someone here should have or know a connection... I hope. Edited-added: Am willing to pay for one on this price range----> http://www.ebay.com/itm/500W-Studio-Lighting-Flash-Strobe-Kit-Photography-Light-Brand-New-/380712907314 (I do not believe the "free shipping" part to up there ) Am sure cannot afford the installation fees nor let me do it myself ... Does the orbiting ISS faces always the same surface towards earth; or will it requiere a gyroscope mount ?

Correct, there is methods to locate the ISS for all having a computer.

Would it be possible for some of the well connected SFN members to propose NASA the implementation of a strobe light beacon on the International Space Station in such a way to project a cone of perhaps 20 degree colored strobing light downwards as to tell the world its presence overhead during night passes ? It would be very significant, on an insignificant power consumption and perhaps cost, or a harmless green pulsed laser instead. I suggest such as the ISS is discernible to naked eyes with good vision. A light coming from it should be highly discernible too. Would that harm any technological issues?, for the ISS just to tell us, the world... "We are over your head now!" "We are an IFO !"

It would be soooo nice if SFN big shots could propose NASA to implement a colored strobe light on the International Space Station, aiming a discernible light vertically downwards during the nighttime passes, (with some cone of projection, perhaps 20 degree) Or even a harmless green laser pulsing... Would that harm any technological issues?, for the ISS just to tell us, the world... "We are over your head now!" "We are an IFO !" I propose such as the ISS is perfectly discernible to naked eyes with good vision. A light coming from it should be highly discernible too. Sorry if this is hijacking, ----> delete this post; I would start the subject on a new thread. Edited: Now opened as new topic ----> http://www.scienceforums.net/topic/78493-sfn-to-nasa-proposal/

Found that most people often dream about being chased, with physical difficulty to run away or escape from the chase but never getting caught. This is not about the meaning of such or especulate an explanation; but the common scenario to many. How many unrelated different personalities and personal life intricacies can experience such common dream ! ----> Do you get that one too ?

Brainstorm to develop an instrument to measure the propagation speed of gravity.

Has any solar sail/motor type of device has ever been built and worked on earth, experimentally ? Sort of a Crooke's radiometer, with the radiation-pushed half of a spinning sail exposed to sunlight and the returning half shaded, all perhaps in high vacuum ? If half the globe of a Crooke's radiometer is shaded, would such be an equivalent of a solar sail motor ?

Thanks. Of course, it is high frequency AC; but AC fed solenoids/relays/electromagnets do sustain attraction when energized. I would have to try myself if nobody else on the forum uses such cooktop. Seems 340 alloy is the convenient one.

Seen advertisements where the ferromagnetic cookware used on induction cooktops turns the cooktop power off when pulled away from the 'burner' by some built-in sensor. Am fine with that. If the energy is magnetically transferred to a ferromagnetic pot; how can the pot be effortlessly lifted without the attraction force impeding the action ? How does it work ? Question 2 : What stainless steel alloy is more convenient for induction cookware that will be used suspended 3 mm above the induction cooktop suface ?

From experience, it is a product that perfoms. If its price is justified, depends on your application you did not expose. Sheets of different dimensions show at ----> http://www.ebay.com/bhp/sorbothane-sheet ; but you never mentioned size you want. Plain consumer insoles of gel or sorbothane seem more expensive than sheets. Shock "resistant" and shock absorbent are different animals, and simple to do a test, with the materials you mention, or a sandwich of those fancy gels. A plain lead bar can do wonders too.

Search for sorbothane products. Their main site has some and applications too.

They sleep because are fed by people. They do not have to look/hunt for food by themselves. They practice symbiotic psicology for comfort with humans. Try not feeding for a while and will start climbing the walls to eat a bug...