Talk:Sodium Scenario

Thinking Moon

The Sodium entry is a good example of thinking Moon. That is, looking at ideas that are insignificant when used on Earth but could really save the day when used on the Moon. It does take a rather long scenario to show how Sodium could be used, but this is part of the process needed to compare complicated technical ideas.

--Jriley 13:25, 11 May 2007 (UTC)

The only problem I see is that sodium/potassium may not be suitable for buried wires, as described in the Sodium Scenario, as they can be easily scooped with a spoon or cut with a knife. Even if the wire is re-enforced with fibers and an iron core, malleability of the conductive layer could prove to be an issue in high use areas. Excavations and geologic settling would need to be very closely monitored. Long term studies of this kind of buried wire combo may have very interesting results. Would Na and K slowly mix and produce NaK? Would there be enough heat or tension to meld them together? How would the wire deform under varying subterranean pressures? I also cannot help my curiosity about the rate of loss experienced by bare cable buried in lunar regolith, as it will be interesting to see what effects the nano-phase surface iron may have on an uninsulated circuit. How could all of the above effects be mitigated? Oh, what I would give for a bag of mare simulant and a couple of vacuum chambers in a real lab right about now.

Jarogers2001 17:22, 12 May 2007 (UTC)

I thought they got somewhat cold winters where you live. Have you never seen condensation on windows and walls in winter? (Not usually prevalent in modern homes, but was quite a problem in older stone, brick and block buildings in much of Europe)

Luna's not very cold, but it's not very warm underground either, certainly not warm enough to eliminate the possibility of condensation. So I don't think sodium is suitable for indoors. Outdoors there's the problem of the daytime heat, more than enough to melt sodium.

If you're going to go to the trouble of using an iron core, I don't think sodium offers enough of an advantage over just using iron on it's own. And remember, they only use conductive skins to mitigate skin effect, something that's not particularly bad over relatively short spans at high voltage and low frequency. Basically your common HT cable on Earth is steel, they just put an aluminum skin on it to reduce losses.

Technically these two posts should be moved to Talk:Sodium_Scenario. If you move yours, I'll move mine. Using export - import isn't worth the headache for two posts. :)

-- Mdelaney 01:25, 13 May 2007 (UTC)

Just a fairly minor nitpick, technically 2 kHz qualifies as RF, but it's ULF band, very specialized and very narrow bandwidth. According to http://en.wikipedia.org/wiki/Radio_frequency it's listed for use in: Communication within mines. Not too sure if they mean mines(boom) or mines(coal) if you know what I mean. But if they mean the latter, we might need to keep that clear for our own mining ops.

2 kHz would definitely be subject to skin effect though so the point of using a better conductor in the skin is well taken. But might it not be just as effective to use a lower frequency and a slightly thicker iron cable? (We can probably get away with iron dust transformer cores at frequencies as low as 400 Hz).

2 kHz 3 phase would produce a full-wave-rectified power-supply ripple frequency of 12 kHz, should be easy enough to filter out, but could be very irritating in the wrong place if a smoothing capacitor(condenser) goes open circuit (nowhere near as likely as a short circuit with electrolytics).

-- Mdelaney 04:02, 13 May 2007 (UTC)

viagra viagra

The recalled lot was distributed between September and October to distributorswholesalers hospitals and pharmacies located in the following states Alabama Arizona California Colorado Florida Georgia Hawaii Illinois Indiana Kentucky Louisiana Maryland Massachusetts Michigan Mississippi Missouri Nevada New Jersey North Carolina Ohio Oklahoma Pennsylvania Tennessee Texas Utah Virginia Washington and Wisconsin.It has long and varied traditions across Asia and Europe and was prominent in medieval times but its roots go back thousands of years. <a href=http://buyfinasteridenorx.com>buy propecia 5mg usa</a> However any level of physical activity can potentially have health benefits.Hypertension Oral LASIX may be used in adults for the treatment of hypertension alone or in combination with other antihypertensive agents.valued it for controlling fevers vomiting and diarrhea If you give a drink of white flowers in wine it helps recovery from dysentery If you make a drug patch made from fresh flowers it prevents conception.An optometrist is a healthcare professional who examines metro to measure eyes and prescribes corrective lenses and may treat eye diseases.Lecture Simmering SoupThe Neuroendocrine System Hans Selye and HPA Physiology In the mids Hans Selye was interested in sex hormones and in particular how sex hormones affect behavior and development.Examine the patient for any injurieshead or spine fractures posterior shoulder dislocation tongue lac erations bowelbladder incontinence.Sabiston Textbookof Surgery. <a href=http://cdeine.com>siti sicuri per comprare online viagra</a> Answer This patients presentation suggests osteoarthritis.General characteristics a.Alternative Names Abdominal film Xray abdomen Flat plate KUB xray References Morrison I.Its a process called stimulus control. <a href=http://apamil.com>genetic viagra using mastercard</a> We feel sad because we cry.Morales A.Fortunately treatment for breast cancer has advanced considerably since the days of early Egypt Armitage et al.The constitutive forms of the enzyme nNOS NOS and eNOS NOS are coupled to Ca and calmodulin and are the principal NOS isoforms involved in the induction of penile erection whereas inducible NOS NOS is independent of Ca and calmodulin and requires new protein synthesis Arnal et al. <a href=http://shopshopfastbestmed.com>levitra brand online</a> Characterized by intermittent symptoms that include SOB wheezing chest tight ness and cough.THE RISE OF SCIENTIFIC MEDICINE The Four Humors The Ancient Greeks believed that the body contained four fluids called humorsblood yellow bile black bile and phlegm.Updated JulyIt is not directly related to exertion.Computerautomated medical history questionnaires help doctors use their time more efficiently and evidence shows that patients answer a machine more honestly than they do a human doctor especially on sensitive topics such as alcohol or drug intake and sexual relationships. <a href=http://buyfurosemideus.com>buy 500 mg lasix</a> During these epi sodes the patient is incapacitated and must lie down in a dark room for several hours.