Externet

Hi. How to execute a set of commands automatically after finishes initialization (Win98 ; Win XP)? Getting into Windows explorer, I manually delete 'temporary internet files' and all 'cookies' from within their folders periodically, which is supposed to happen when the option to do it when closing the browser is selected under Internet 'tools' But it does not happen as expected, and besides cookies being kept in the cookies folder, they also hide in several 'internet temporary folders' along with more crap pumped by peddlers and spies of all sorts. To the colorguard of computers idiots (me), is not easy to implement such 'Startup?' set of actions. Can someone tell how to do it in simple terms and clear steps ? Miguel

Hi. You may be under the wrong impression seeing one single cable that actually has many wire pairs in it, each pair handling only one communication path. If it is truly a single metal pair, can be digital communication, where the voices of multiple simoultaneous users are sliced in tiny portions, fed into the single wire pair (multiplexed) and at the other end, the slices sorted and put back together and properly re-routed (demultiplexing) Links between telephone central stations use the same multiplexing method on a single fiber optic, with thousands of rapidly sliced signals. Miguel

Hi. Scuba tanks are rated ~3000 psi, ~80cuft.. If you fill one at full capacity, you have a good chance to rip your head off playing with its valve and pressure. Do not even dream of a garden hose! That is not a toy and can be lethal in wrong hands. Miguel Scuba diver

Yes, Alienufo. As if you discover a reaction to reverse vulcanization to turn old tires back to rubber to make new tires. Selling that formula/method could yield figure$ you cannot imagine. Miguel

What common materials/elements could be the ones used in this gadget? : http://dragonet.com/fhp/ Has 8 cells to yield 12V, and only anodes are consumed in operation.

Hi . Does galvanic protection under seawater by the use of dissimilar potential metals create an electric field and electric current in the water? If yes, to what extent ? A mile apart chunks of zinc and iron, will there be an electric current between them ? Miguel

Yes, for the same motion the stronger magnet will induce more current; but takes more force to push the strong magnet to achieve the same motion. Are you reading?

Thanks gentlemen; that was very clear, simply better than some text books. The rectenna would be what am after, but in semiconductor style construction, perhaps using materials with the property that weak photons can knock their electrons off. Miguel:-)

Hi. ..."Your kinetic energy is being changed by the magnetic field into electric is what you meant? energy. "... I would say that the stronger magnet takes more effort to pass it over the wire; then, the kinetic energy is different in every case. More force to move the stronger magnet, less for the other. The efficiency would be the ratio of the electrical energy generated and the kinetic energy requiered to move the magnet to produce such generation. In small experimenting driving magnets by hand, you cannot discern those minimal differences. You would need measuring instruments to show such. Just imagine a permanent magnet toy motor, -used as generator- how much torque needs to be spinned when electrically loaded. The same motor with no magnets in it (extreme case of weak magnets), will need much less torque to spin it with the same electrical load. Hope it helps, Miguel

Thanks, gentlemen; am learning good from you. If all energy are photons, visible light range or radio range, the point of view can be changed from visible light spectrum to radio spectrum. As ..."IR has quite a low frequency and so it has low energy"... Focusing the center of attention to radiowaves (also photon EM energy) ; the IR spectrum has a MUCH higher frequency and higher energy than radio. Trying to express myself better: A plain microwave oven, rated say 1 Kw emits EM photons at 4 GHz. If its frequency is increased (towards IR) the energy emission would be greater (am not talking about its cooking abilities) as : "E = hf E is energy h is Planck's constant, simply put it's just a constant f is frequency" Then the new rephrasing would be... ¿How to manufacture a PN junction cell of some kind that will convert RF into an electric current and performing up to IR ? Is the explanation still the same -too low energy- ? If so, that 1Kw ! microwave oven is too little energy to recover any from its confined chamber by means of some sort of cell ? Thanks, Miguel

Agreed, solar cells do not work with heat radiation. That is the point. Rephrasing... What would take to make a cell similar to solar but centered in the far IR ? -- "thermovoltaic" instead of photovoltaic -- It is not about sensors, as the ones used in infrared cameras and thermal imaging, those are fine for detection but not for generation. What does waaaay too low energy refers to ? The heat radiation to be collected or the electrovalence energyband something of the PN junction ? Miguel

Thanks all for the explanations. I was interested in the radiation form of heat transmission only, it is difficult to understand how simple friction of two electrically inert bodies can radiate electromagnetic waves (heat).

Oh, boy ! Thanks.- By Swansont : ...You shouldn't distinguish between the photons and the radiant heat. They are the same thing."... By Tycho? : ...Radiant heat is EM radiation, so its made up as photons just like light and x-rays. Both opinions on the same track... perhaps am influenced by the word 'photons' I thought being visible-only light emitting... which is not visible in far infrared (heat) radiation; but still named photons ? OK; next step. ¿What would it take to make a solar cell with shifted response towards the far infrared spectrum; if it is a photon emission, could dislodge electrons from a PN junction and create some electrical current when exposed to radiated heat ? Miguel

OK, thanks. So it is an electromagnetic wave. As in distant atomic bomb explosions, photons from the flash are perceived simoultaneously with the heat; the shock wave and noise is obviously later.

What is the propagation speed of radiant heat?

How does heat radiate ? What is that emission of heat ? Is it some sort of rays, electromagnetic waves, particles, molecular vibration ? A body placed between a radiated heat source and its target can block or absorb it. What is actually traveling trough the air from the hot body to the being heated one ? Miguel

Could SZn be used as paint, mixed in some clear base to be applied onto walls to provide some glow from its luminiscent properties ? Has it been done?

Hello all... Two identical air compressors in series, both running at the same rpm. But the second in reversed flow, as to force expansion of the air compressed by the first one. ¿ Will there be pressure in the pipe joining them ? A-------C~~~~~?~~~~~E-------A A= atmosphere C= compressor ?= is there pressure in this joining pipe? E= expander (reversed compressor sort of a vacuum pump) ------ = pipe ~~~~ = radiator or finned pipe or cooling coil Anyone remembers ROVAC ? Miguel

Heating a home in general is considered more expensive than cooling, if both energy sources are at the same rate. Cooling process is lossy because of the compressor, evaporator and condenser inefficiencies, but the temperature gradient overcomes those losses. Cooling happens when the temperature is about 32 Celsius, and you want to extract heat for a delta temperature of about 10 degrees to get a comfortable 22 Celsius. Heating happens when temperature is around 0 Celsius and you want to add heat to reach about comfortable 20 Celsius. The delta temperature is twice for typical heating, the cost is nearly twice for heating. If you want to heat / cool the same amount of degrees, cooling is more expensive. Miguel

Hello Am not familiar with such item being available on commercial scale, but will make a couple of phone calls and will find out some more. It is all about energy. I read somewhere that a person yelling non stop for cannot remember how many years, would produce the energy to warm a cup of coffe. Dealing with such extreme does not make it simple. Besides, the range obtainable in real time electrical transmission would be near nothing, surpassed in range by far by the plain voice range itself. A piezoelectric flame lighter strikes a crystal and creates a respectable high voltage at a minute current and for a brief moment, but the strike is considerable respect to voice induced vibration. Get a piezoelectric transducer out of a defunct telephone ringer -or many!- (the larger diameter the better) and connect it to an oscilloscope to measure its voltage, then load it with some resistance to simulate either charging a capacitor (diode rectification of course in circuit) or operating a circuit. I do not think it has to be much more efficient than talking in front of a loudspeaker and measuring its output as a microphone. I say piezoelectric because has a remote chance of surpassing the 0,2V of a Ge rectifier. Storing that energy for brief, very brief transmissions is doable, but in real time, cannot see it. Not much more I can think at the moment Miguel

Hi. A long antenna is not really necessary, as a pocket radio with a few turns coil on a ferrite rod and a few picofarads tunes to AM. A tuned circuit of a few microfarads and a coil on iron core can extract some tiny energy from mains radiation; of course a long antenna would improve it. Miguel

Hello. The nearest related technology I know of about your question is not that new, from an article in the seventies. An U.S. embassy in Moscow received a present from the russian government, a nice piece of folklore art or something like that and ended hanging on the wall of the ambassador's office after exhaustive inspection from security to avoid spyonage bugs. Well, they found much later the thing had a few millimetres long and innocent metal wire in something like a resonating cavity (think of a microguitar). That was it. A microwave beam was aimed to the thing from a nearby building, and the voices and conversations in that office modulated the wire tuned to the incoming beam, re-radiating or bouncing the signal picked by a receiver in another nearby bulding. Isn't that clever? Entirely passive! A piezoelectric transducer, to charge a capacitor with collected energy from noises could emit very brief bursts of data on micropower transmission to a limited distance, if a very engineered device is built. But the energy is way too small, unless your piezoelectric wafer is truly large and exposed to large noise, leakless capacitors for storage, etc... I don't see voice as capable of. An alternate power source may be the 50/60Hz radiation around us, collected and rectified by some sort of 'crystal radio' tuned to mains frequency. It is an interesting subject, keep stirring the idea, some will come out of it. Miguel

Hi. Sintering, coating, magnetizing, demagnetizing, anodizing, tempering, annealing, painting, stripping, cutting, punching, stamping, cleaning, lubricating, packing, gluing, labeling, engraving, burning, freezing, heating, cooling, drying, wetting, humidifying, compressing, expanding, oxidizing, tarnishing, dyeing, vulcanizing, deburring, polishing, filing, grinding, sanding, tumbling, hammering, bolting, nailing, crimping, screwing, insulating, measuring, calibrating, irradiating, there have to be dozens more... Hope helps somewhat. Miguel

Hi. ¿Was it April first?

Right. Most appliances do not care for the frequency (light bulb, toaster) some are slightly affected but the buil-in tolerances absorb the deficit (radios, stereos, computers) and some other will change its behavior (washing machines, turntables, fans... whatever has synchronous motors) Miguel