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You will have to phrase your explanation properly. And we do not need to guess whatever your APC means. Make it clear and will be able to help. Miguel

Thanks. The cleanliness and transparency is what attracts me, for using such clear gel in glass containers for indoor plants instead of dirt. If such gel can support life in plain mature plants in my living room. But it's better a healthy nice plant on dirt than a dead one in a pretty pot. Miguel

You have not tried a DC motor of the same size of the AC ones you say emit noise. They do too. Do not compare your mom's blender to a battery operated toy. Miguel

Sparks, spikes and electrical noise from an automobile engine are changes in amplitude or amplitude modulation AM Changes in amplitude are ignored by a frequency modulated FM receiver. Miguel

Yes. Just use a mirror and bounce solar light signaling to the moon... and beyond. If you glue the mirror onto a speaker cone, will transmit the audio modulating the sunlight. Miguel

A zener diode is like a spill lip on a dam. Depending on the value of the zener (or height of a spill lip) , the voltage is kept constant as the level of the dam. Miguel

The sea is a living soup containing microorganisms that emit light when disturbed. Fishing boats usually go out at moonless nighthours as any activity from fish schools is clearly discernible from the surface, and that glow is the one they circle with their nets to capture the fish causing the glow. When moon rises, it's time to head to port as moonlight is enough to mask the glow. Foam forms from lots of sea motion and the glow shows brighter in it. Miguel

How would you turn a liquid as the solution of nutrients used in hydroponics into gel; or something like this ? : http://www.kidsgardeningstore.com/14-1010.html Thanks.

Hello. Durability in hours = CPU speed(in MHz) x number of built-in microphones ÷ SPL (120dB) times the noise wavelenght in metres x Degrees (in Kelvin scale). For chinese built, multiply by the factor K= 0.3165656 Yields a margin of error of 0.4%, quite acceptable. Miguel

Hi. An electronics forum would more apropiate, but I can help. If you have experience with integrated circuits, you could build a timer circuit using a very common 555 chip, its related components, switch and relay. If you are not familiar handling circuits, buy a timer relay from an industrial electric store, or salvage a wiper timer relay from a wreck yard. Miguel

Hello all. Is there any method to identify an element by flooding it with some radiofrequency and sensing any resonance or particularity to the element ? The elements presence in distant planets is deducted by spectroanalysis; that is when there is visual contact. As the case of being irradiated with light wavelenght and observing the reflections. What if there is total darkness, or inside an enclosure; how to identify them? Would atoms emit a signature that can be picked in the radiofrequency range ? I know there is a tool to detect the presence of lead in electronic products entering Europe, but unsure if works with atomic principles or radiowaves. Miguel

Prices do not "go up" by themselves. It is the greed from speculators speculating on speculations who push prices up. There is no other reason. And the cities follow happily as rising figures bring more taxe$ for existing services with no need to invest. Municipalities may not become happy from cheap construction; to believe a city prefers low housing prices is a mental masturbation. Believe it or not, the problem is there is too many people with too much money who never had to sweat for it. Miguel

Somewhere, there is a old MRI tunnel -magnetic resonance imager- behind spider webs waiting for a dumpster. Finding it is the task. Or, can you lure the crabs to the hospital? Miguel

Hi Mokele. The magnetic field is given by Ampere x turns. Amperes are Volts ÷ Ohms; then The magnetic field is also given as Volts x turns ÷ ohms. Increasing the tension or the turns, or both, while keeping resistance low is the ideal for maximum efficiency in your application. 10 Amperes in a 10 gauge wire is not of concern at all. Such current is under half of the carrying capacity for that copper wire with no appreciable heating. Forced ventilation of the coil may give you piece of mind for long time operation. A rated 30 Amperes wire running at 15 is of no concern either. The 7º rise per second does not make sense. Now, is the magnetic field to be pulsed or constant? Miguel

Rocketman: About making clouds with airplanes; I thought clouds trap more heat, as cloudy nights get warmer. In the other hand, clouds block the sun... How would the ideal work? Making clouds during the day but not having them at nights in order to cool the planet ? Miguel

Hi. Scientists are not fully sure; they have good suspicions the warming is caused by us. Very probable. What would be wrong with a lunatic idea of massively attempting to cover with cheap mylar mirror film the sunniest unused areas of the planet? Even roofs? Would that reflect a ~95% of their incident solar heat back to space? Tiny area in the global context, but... is there another action in plan? I have no clue on how calculations would have to be conducted to come up with a mirrored acreage to at least counteract the situation to get worse. Would you replace your car with a bicycle forever? Or just spend more energy in airconditioning your home ? Costly, well, as soon as mylar film factories find out another application for their product, will immediately pump up the price. Or should it come down by volume production ? The money spent in wars could buy quite an acreage of mylar mirror instead. How would you plan action ? A huuuuge umbrella held at the space station? Alternative; just hear the press talk about it and do nothing. Miguel

Hi. Not on fluorescent, but a pretty site to mark and enjoy: http://www.jcsparks.com/painted/pigment-chem.html#Brazil Miguel

S p o n g e . ½ pound of sponge wrapping the eggs is enough cushioning. Miguel

Hello. How complex could it be to make a couple of kilos of Gd5(Si2Ge2) plus 1% in volume of Fe added ? What equipment would be needed ? Miguel

Hi. Some societies have the daily habit of eating huge volumes of food, without neccessarily having big bellies (like in Spain:-) ) Some people (like me) habitually eat really small quantities of food. I have read -and seen- that poorly fed kids as in some African nations develop large bellies. What is going on ? Can persons fed in large quantities not develop large bellies because their metabolism is used to count on never a short supply of food ; and people eating very little store reserves as a natural 'defense' mechanism and thus developing large bellies ? Miguel

Hi all. Now i got confused; this site: http://www.mathopenref.com/subtend.html shows the subtended angle for the sun being 32 arc minutes or 0.52 degree. That seems very small. Does it mean that in a 12.0 hour day, the sun path could be drawn as 346 sun disks fitting edge to edge on the sky ? Am trying to create a formula, chart or nomograph to calculate the needed diameter of a distant mirror reflecting the entire sun disk. (As a heliostat of what diameter positioned at a given distance will show the complete sun disk) Miguel

Ok, that means one side of the membrane has 800 psi more than its other side... The top of the membrane would have the ocean column pushing water down, and you have to make vacuum under the membrane to obtain 0 psi for the pressure differential. The pump under the membrane would have to be 800 psi anyway for its outlet to reach the surface. Work on that. Miguel

Thanks, fellows. The flux formula is from Kester, and they only reveal being a "modified resin". If Sn has affinity for Au, would explain the fast erosion. I would have no problen in trying Pt but if dissolves as gold there is no point on increasing my frustration. It is plain Sn unleaded solder for electronics, and canot discern what material for the soldering iron tip could handle it without degradation. Suggestions on what to use ? Miguel

Hello. Does molten Sn attack 24K gold? Just had my electronics soldering iron tip jacketed in 0.5mm pure gold and eroded in a minute at 800ºF! (There is a chance it was a poorly done job by the goldsmith) What other metals will get wet with 96.5% tin solder and not degrade with oxides, corrosion, staying tinned ? Ag, Pt, Ti,...? Miguel

Thanks, jdurg ! As am not thinking this for a batch type/test tube laboratory centrifuge, but for a continuous-flow industrial type as in: http://www.alfalaval.com/ecoreJava/WebObjects/ecoreJava.woa/wa/showNode?siteNodeID=5381&contentID=-1&languageID=1 [These machines run at 10 thousand G's, I know their performance from the years I worked at a fishmeal plant where these extract oil from fish 'broth'] ---> Can I interpret your answer as... A centrifuge can be used as a desalinator if fed with seawater ? Would ions respond sustantially different to extreme gravity than water itself ? Which would float, ions or water ? Miguel