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Post by smlbstcbr on Oct 28, 2008 22:57:41 GMT -4
Actually, the "ref" I was asking for was a Reference from smlbstcbr regarding the conductance of water at high frequency. Sorry, I'm late at answering this. Water (and all other dielectric materials) have a property called permittivity. In essence, a measure of the magnetic moment of the molecules in the material (my references, well, just remembering my PHYS 200 class at college). Given that a electric field changes the bipolar moment of the molecules, this distorts the electric field inside the material. Consequently, electricity flows in the circuit formed by the material and the source of the electric field (an insulator does conduct electricity). However, the material dissipates very little energy, so the material stores energy as an electric field. Depending on the properties of the material, it will distort more or less the electric field, storing more or less energy. This device is the well known capacitor, and the solution of Maxwell's equations for a capacitor gives a frequency dependant solution. I think of the form is: I c=Cdv/dt, where C is the capacitance and dv/dt is the voltage (electric field) variation over time. As it can be seen, the solutions give a frequency dependant impedance. If you put a v=a·sin(wt), where w is the angular frequency of the voltage source, the current trough the capacitor is: I=Cd(a·sin(wt))/dt = Cwa·cos(wt). Now, note that the magnitude of the current multiplies by the frequency at which the circuit is working. For DC (w=0) there is no current flowing through the circuit, except during the transient. Water is a good dipole, so a capacitor built with water will conduct electricity very well at high frequencies. Depends on the geometry of the capacitor, a priori. As said, when analyzing circuits working at high frequencies, the simple Ohm Law is not enough. Transmission Lines theory must be used, it's essentially Maxwell's laws glorified. I remember hating that class at college.I Hope you will find this information useful, I remember those years at college with hate and love at the same time. EDIT - I suddenly remembered it was phys 200 not 103
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Post by smlbstcbr on Oct 28, 2008 13:07:58 GMT -4
Talking of quotes, one from Morales. During a rally, he spoke about the criticism that Justice and Constitutional lawyers were making about many decrees that were obviously out of law: "My counselors, my assessors and my lawyers told me that they [the decrees] were illegal, that cannot be done. I told them, for very illegal they might be, they have to approve them. They [the lawyers] had to make it legal, that's the reason they are paid and studied for."
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Post by smlbstcbr on Oct 27, 2008 14:10:55 GMT -4
Microwaves? I believe ultrasound makes that part better, never seen a nebulizer?
And your experiment is simple, tough lacks a careful analysis. Materials do not behave the same at 1 Hz than 1000 Hz. Water insulates electricity at 1 Hz, but conducts it, notably well, at high frequencies. Microwaves require a high-level electromagnetic analysis.
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Post by smlbstcbr on Oct 27, 2008 14:03:57 GMT -4
Hating war and the destruction it causes is a healthy attitude. Refusing to ever consider using force because you hate war so much is naive. Right there, but that's what I think.
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Post by smlbstcbr on Oct 27, 2008 14:02:05 GMT -4
I'm not sure what you're saying here. Are you denouncing the "naive nationalism" advocated by Morales? If so, that's refreshing. If not, you need to clarify what you mean. Yes, it's a denounce, the thing here works this way: Morales always appeals to the horrendous pages of colonialisms. In his speeches he always dramatizes about the fact of 500 years of slavery lived by the natives. As most of them are ignorant (another evil among culture) they are told they are the victims of white men (and with reason, there's no doubt about it). However, Morales takes this to levels of hate, makes use of their pride to attack everyone who is not aligned to the government, especially the eastern part of the country, which was colonized mostly by Europeans (white people, notably). Eastern part was the most economically and human depressed part of the country until about the 1970 decade, when Banzer (the dictator) granted vast extensions of lands and machinery for the farmers. By that time, prime matters had a high price and the western miners lived a prosperously. However, when the prime matters prices went down, the political system (by then ruled by MNR, or National Revolutionary Movement, Gonzalo Sanchez de Lozada and Paz Estenssoro) decided to change to a liberal economical system, the reason: the government went bankrupt because of all the subsides to the mining industry. This lead to a massive migration from the western mines to the valleys and eastern lands (now prosperous because of oil and agriculture) known as "The re-localization". Suddenly, hundreds of miners were working for eastern farms. Here is when Morales surges. The valleys occupied by the re localized miners were planted with coca. The rest is known history. What I am trying to illustrate is that Morales takes history and bends it, twists it and mixes things that have no relation to spread hate among the natives. Example: he always alleges that the eastern is occupied by the descendant of the spaniards that enslaved the natives for 500 years and that they should be expelled by all the suffering they caused and that the indigenous majority will rule for 500 years to punish them. Spaniards colonized the western part of the country, where the mines are located, not the eastern part. He uses very colloquial terms to refer to the eastern landlords, such as fascists and oligarchs. He doesn't miss a chance to qualify US as "the empire" and always states that US is the most evil thing in the world and calls, literary, to war against them and their allies (according to him, the eastern landlords). As you can see, Morales force resides in the hopes of people, that is promised lands and home in exchange for their support. As always, they are forgotten in the end. The term naive, I believe, is the right to qualify the actions taken mostly by ignorance, appealed by the good will of people. Agreed. Same thing in progress here. Agreed. I hope so, though some attitudes from Putin are quite controversial. Looks like they are quite touchy about what is said about their country, perhaps too much. And the incidents at Georgia and Venezuela only fuel that.
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Post by smlbstcbr on Oct 27, 2008 12:53:30 GMT -4
I prefer to get the rotten tooth out in one pull, even though it hurts much more over the short term. You seem to prefer to let it fester as long as it still looks pretty, which would ultimately do more harm over the long term. It depends in who's mouth you are picking. The war, any war, always hurts to those who have nothing to do with it. And Iraq is proving that. I suppose that I hate war and any kind of power demonstration because of what we are forced to live every day here. (Politics is making a little war here )
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Post by smlbstcbr on Oct 26, 2008 21:13:19 GMT -4
Despite the millions of people he literally starved to death Mao Tse-Tung wasn't all that bad. As well as the two million refugees (and increasing) that US has made with this war? Sure, World Police is better than ever.
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Post by smlbstcbr on Oct 26, 2008 15:29:11 GMT -4
I won't justify any kind of terrorism act, be it from the government or foreign forces. Such acts ended at Hussein's trial and execution. But, despite those horrible mechanisms of repression, Iraq was relatively calm. The raids that Allied troops make at the houses in Bagdad and all over Iraq are not precisely pacific expressions. BBC showed last night the terror that citizens in Bagdad live when the troopers break inside houses, and to make things worse, nobody can understand each other. And you are forgetting the scandalous treatment given by a few individuals to prisoners, looks like "an eye for an eye" kind of revenge...
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Post by smlbstcbr on Oct 26, 2008 11:58:25 GMT -4
Speaking of naivety, the situation my country lives is a product of the most vicious, vile and outrageous manipulation of people's hopes and expectations, not because people want to emulate Chavez but because of ignorance and, again, naivety from people. Here, the government promises all to move the masses, but at the end, nothing is granted to them. Inflation has broken records and the only thing that comes from the spheres of power within the government is propaganda blaming the opposition of all the bad things that happen here. And to affirm that either candidate is not going to gather votes/voters because of naivety and manipulation of image/identification of the voter with the candidate is just out of reality. Unfortunately, the war was sustained on allegations. The only sure thing they found was that the weapons were, in fact, destroyed. However, the knowledge and expertise to start a new program was still there. North Korea is testing their nuclear capabilities and US is not precisely mobilizing troops to stop them, even with reliable information sources pointing that their missiles are being developed. If things were bad when Saddam was in Iraq, they are infinitely worse now, with the US et al, surviving each bombing in the middle of a destroyed country. Iraqis do have reason to kick US and allies out of there, they destroyed their country and their lives on allegations. And the invasion was poorly planed, the invader troops cannot even understand the language spoken there, so it is natural to expect a violent reaction to the invader. Add this to the poor knowledge and traditions in Iraq. Trying to bring democracy using war is a bad method. It is a process that may require decades to complete, and war certainly won't help in this. Well, Russians were very disgusted by Palin's words concerning future actions regarding their relations should they get the presidency. Considering that US crisis will certainly become a recession, investors will look to other places. Russia may become a very strong opponent to the US, along with Venezuela's petroleum and their constant weapon selling to Chavez. So, if this is not a prelude to another Cold War, then, what it is? My mother always said that discussing politics and religion always ends in a fight. She's been always right.
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Post by smlbstcbr on Oct 25, 2008 22:28:16 GMT -4
, as I posted in YouTube, the back-pack (sorry for the term) is too small or slim. Be not angry (altough, very reasonable), this nutter (the guy from youtube) wins a small battle every time one of us gets angry when seeing/reading his stupidity.
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Post by smlbstcbr on Oct 25, 2008 20:00:50 GMT -4
I feel sorry for the old fart.The Republicans are going to loose this because McCain is such a poor candidate. He is way too old and it shows in his off the cuff remarks. He reminds me of Bob Dole in his last race. Both had been strong politicians but had past their prime by the time they got the party nomination. A better candidate could have contrasted with Obama's leftward leanings and convinced voters to move toward the Republicans. I hope that the naive nationalism that is behind many US voters won't come in play again. As McCain has a very long military history behind him, it's possible that it may act against reason one more time. Until now, no mass-destruction weapons were found in Iraq and, from an outsider's point of view: Iraq was way better before the war, no terrorism, people (at least to mi impression) lived a very calm life. Now, it is ruined and terrorism there is just unbearable. Besides, the cost of war is making a big hole in US tax payers pockets. If McCain becomes president, war may be in Iraq for a very long time, and I fear that certain comments made by Palin (who is the lead boot of McCain now) may trigger a second Cold War. Again, from an outsider's view, Palin is naive and, for saying the least, very ignorant about the reality of the world; McCain is certainly a good friend of big companies. For now, the agenda of Obama requires some fine tune, but I fear that some will see the "Original American" more personalized in McCain than Obama.
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Post by smlbstcbr on Oct 22, 2008 13:12:00 GMT -4
Hi there, I've found something that I had no idea, India launched a probe to the moon. I am happy and worried. The HBs will take into account that NASA has some devices there, surely they are going to argue that it is there to cover their forgery. Anyhow, it is another milestone for human exploration of the moon. news.bbc.co.uk/2/hi/science/nature/7679818.stm
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Post by smlbstcbr on Oct 13, 2008 12:32:18 GMT -4
The electric motor is heavy. The batteries are heavy. 95% efficiency is not much help, if the electric engine weights twice as much as a heat engine. An internal combustion engine, of course, will not work on the moon. There is argon gas on moon; but certainly it will not jump into the container. Aside from that, it would be a good fluid for a heat engine. Moon crators, not in sunlight, can have a temperature as low as 50 degrees above absolute zero. At the same time, sunlight delivers heat, (from mirrors) at over a thousand watts per meter. This theory is good, but as you mention, we do not have any practical experience with non-combustion heat engines. Where did you come from with that? Real 95% efficiency is quasi-ideal, comparing it with a theoretical cycle. And about power-weight ratio, the Tesla Roadster motor weights about 30 kilos and delivers an average power of about 190 kW with an efficiency of 85%. And battery technologies have made huge advances, otherwise, you'd still have to plug a laptop to a lead-acid battery.
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Post by smlbstcbr on Oct 11, 2008 14:49:38 GMT -4
IMHO, I believe this thread is straying apart too much. As many noted, any machine that is going to use heath as a mean to produce movement will require a very specialized design concerning the heath transfer system. In an atmospheric environment that is a very friendly mix of gases (like Earth), it is not a problem. But the Moon has a very, very, very, very, very weak atmosphere. Any improvement that has been developed for heath machines, like engines with open or closed cycles, won't be the same in very different conditions. And Thermodynamics states that there is no heath machine that operates beyond the Carnot Efficiency (60% at most). As noted, the versatility, the reliability, the efficiency (there are electrical motors about 90% efficient). Comparing numbers, you have to choose the maximum efficiency. While a heath machine will theoretically have a top efficiency that follows a Carnot cycle, an electrical motor has a real top efficiency of about 90 - 95 %. They are small, nearly no moving parts, a very wide operation range, high starting torque, etc...
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Post by smlbstcbr on Oct 5, 2008 10:24:07 GMT -4
I hope you don't get too bothered because I like my own ideas. Heat flows from hot to cold. From that you derive that a heat engine has to discard heat to the cold resorvior, and by some long winded aurgument you can say that you can't get something for nothing. In this case, the energy comes from the battery and goes to the microwave. The fluid-gas is just a medium. The Otto-Argon cycle, to the best of my knowledge is my own crackpot idea, opinions expressed here are not nescesarily those of everybody else. There is some argon atmosphere on the moon, which is why a chose it in the first place. Torque and electric motors is quite a topic. I'm sure that part is done by experts. Hang on a sec. This is not a Otto cycle, it's a Stirling one. However, some modifications could actually make this work, theoretically: if you replace the heat source by a resistance you have a heath source that's 100% effective at turning electricity into it. But there are disadvantages. While an electric motor only has three moving parts (the rotor and the bearings), an Stirling engine has a crankshaft, the con rods, the bearings, the gearbox and other bits and pieces. You need to simplify the operation of the machines that are going to be taken to the Moon. A electric motor is very very simple and its transfer function is inherently a negative feedback loop.
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