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Comments

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MIT' Combines Carbon Foam and Graphite Flakes For Efficient Solar Steam Generati

Mr D from 63 Re:Algae (95 comments)

Heat transfer in any system has an efficiency loss associated with it. If you have a primary heat system and transfer that energy to a secondary steam system, you will lose energy in the process. Part of that lost energy is not only direct heat loss from the slowed heat transfer rates, but also in the additional energy required circulate through the heat exchanger, which depends on a lot of fluid passing over a larger surface area.

5 hours ago
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MIT' Combines Carbon Foam and Graphite Flakes For Efficient Solar Steam Generati

Mr D from 63 Re:Algae (95 comments)

Water in a typical closed steam system is managed with various chemicals, and not simply pure water. That is because even with pure water, you will always get some interaction with the system elements and oxygen or whatever gases are present. Methods for managing that have been optimized for large steam plants. Who knows what would "get into the water" even in a closed system with this material and whatever others are required.

I wouldn't assume you can produce high pressure steam with any velocity through this foam. It appears very fragile, and would probably get torn apart by even a low flow approach. If true, that makes a direct closed system approach unlikely. If not true, it still would appear to require a huge exposure area to produce any usable output, which presents significant flow management and collection problems.

So, not all slashdotters are as lost on the matter as you may suppose.

12 hours ago
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EPA Mulling Relaxed Radiation Protections For Nuclear Power

Mr D from 63 Re:About time (223 comments)

Not even close. The waste is funded during the life of the plant. Today's plant designs are for a minimum 60 years of operation, but solar PV life ranges from 15 to 25 years, required all that capital to spent again to replace. Of course, nuclear plants will have lifetime costs as well, but not 3 x cap in present day dollars.

12 hours ago
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Netflix Reduces Physical-Disc Processing, Keeps Prices the Same

Mr D from 63 Re:Alternate view (295 comments)

You could say that if we lived in an inflationary economy. Since we don't, that explanation doesn't hold water.

You could say that if there were no inflation, but since there is, that response doesn't hold water.

On top of that, they got those fast lane fees to cover.

yesterday
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Netflix Reduces Physical-Disc Processing, Keeps Prices the Same

Mr D from 63 Time will tell (295 comments)

Time will tell, if customers really care.

yesterday
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MIT' Combines Carbon Foam and Graphite Flakes For Efficient Solar Steam Generati

Mr D from 63 Re:De-salination? (95 comments)

This foam looks pretty fragile to me. I would guess with any flow rate approaching what would be required to run a steam turbine, the foam would be torn apart. I think that is one reason the researchers didn't point this out as a likely use.

yesterday
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MIT' Combines Carbon Foam and Graphite Flakes For Efficient Solar Steam Generati

Mr D from 63 Re:No concentrators. Really? (95 comments)

If there were a viable system, you would still likely WANT to use mirrors just because they are low cost and make better use of the higher cost heat transfer elements.

yesterday
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MIT' Combines Carbon Foam and Graphite Flakes For Efficient Solar Steam Generati

Mr D from 63 Re:Algae (95 comments)

Only if you are boiling pure water, otherwise you will likely get mineral deposits and such rather quickly.

yesterday
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MIT' Combines Carbon Foam and Graphite Flakes For Efficient Solar Steam Generati

Mr D from 63 Re:Algae (95 comments)

Didn't RTMF... What happens when it gets all gunked up with algae?

It seems fouling would be a big problem in an open system. If you had a closed system, sandwiched the material under a glass plate and circulated pure water or some other fluid in a closed system, with a heat transfer means on a bottom plate, then maybe that would make a usable system. But that would also reduce efficiency by some amount.

yesterday
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MIT' Combines Carbon Foam and Graphite Flakes For Efficient Solar Steam Generati

Mr D from 63 Re:De-salination? (95 comments)

Possibly, but there is no indication if this material will see fouling or depositing from such a process.

yesterday
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MIT' Combines Carbon Foam and Graphite Flakes For Efficient Solar Steam Generati

Mr D from 63 Re:Finally (95 comments)

“There is still a lot of research that can be done on implementing this in larger systems.”

Translated;

“There is still a lot of research that MUST be done TO IMPLEMENT this in larger systems.”

yesterday
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Verizon Boosts FiOS Uploads To Match Downloads

Mr D from 63 Re:No More Limited Upload Globally (228 comments)

How about working on latency as well to enable truly responsive HD video conferencing? That, could storage, and external VPN connectivity are the key areas of benefit.

yesterday
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California In the Running For Tesla Gigafactory

Mr D from 63 Re:Texas? (170 comments)

Certainly I didn't mean to totally ignore politics. If you took my post that way then I understand your response. My point is that primary drivers for a state & location selection are much more 'what can you do for me" based wrt taxes, infrastructure, energy cost, etc. If they get political concessions in that mix, great, but without those other items covered, the political end becomes meaningless.

yesterday
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California In the Running For Tesla Gigafactory

Mr D from 63 Re:Texas? (170 comments)

If yo think political battling should take precedence over actual financial setup success, good luck. FWIW, If Tesla wants Texas to change, the best way is to startup in Texas.

2 days ago
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EPA Mulling Relaxed Radiation Protections For Nuclear Power

Mr D from 63 Re:About time (223 comments)

Are you making some point about cost? retail price? Market pricing? What? An individual contract in the context of a 50% subsidized source with added production credits means nothing in terms of actual cost.

2 days ago
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EPA Mulling Relaxed Radiation Protections For Nuclear Power

Mr D from 63 Re:About time (223 comments)

You mix subsidized prices, market rates and costs in your analysis to the point where it doesn't make sense, not uncommon when trying to make an argument for solar. Stick to cost and you'll see the stark difference. The key thing is that 1Kw of nuclear capacity generates on average about 5 times the electricity in a year than 1Kw of solar PV. And, the cost of backup up is much lower, as you only need 1KW reserve for about 90 Kw of nuclear, while you need almost the full 90Kw of reserve for every 90 Kw of PV. Solar fanboys conveniently ignore that cost, and its a pretty big one.

but even without consideration of that huge additional cost:

The Germans have committed 100 Billion euro in subsidies to spur solar. For that, they have enough solar PV to generate in a year what 2 or three nuclear units can. For $100 Billion in subsidy they could have built dozens of nuclear units, generating many times that amount of electricity. Now they are stuck with the small payback for the huge investment.

2 days ago
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California In the Running For Tesla Gigafactory

Mr D from 63 Re:Texas? (170 comments)

A good CEO will not let politics, revenge or reward guide the decision, but rather consider the total package/environment and how that supports the success model. But, regardless of which states are in the running, the trick is to always have several competitive states in the mix right up till the end, even if you've already decided internally, just to make sure you get the best deal possible.

2 days ago
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EPA Mulling Relaxed Radiation Protections For Nuclear Power

Mr D from 63 Re:About time (223 comments)

The Germans have committed 100 Billion euro in subsidies to spur solar. For that, they have enough solar PV to generate in a year what 2 or three nuclear units can. For $100 Billion in subsidy they could have built dozens of nuclear units, generating many times that amount of electricity. Now they are stuck with the small payback for the huge investment.

2 days ago
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EPA Mulling Relaxed Radiation Protections For Nuclear Power

Mr D from 63 Re:About time (223 comments)

Actually, coal plants are the ones that emit radioactive particulates into the atmosphere. Nuclear plants don't, and as the primary other available baseload generator therefore can historically be credited with offsetting more radioactive emissions from coal than any other single energy source.

So, if that kind of thing truly scares you, you should be glad we've had those nuke plants running for so many years. You can "breathe easier"!

2 days ago
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States That Raised Minimum Wage See No Slow-Down In Job Growth

Mr D from 63 Re:Short-Lived? (769 comments)

Michigan's woes are in a large part due to the auto industry failure. In some respects, if you want to equate minimum wage law with union wage requirements, one could argue that Michigan is a prime example of the negative effects of higher wage requirements, as the industry clearly decided to leave that state behind.

I'm not really on one side or another of this debate, although I do believe some jobs just aren't that valuable. I just hate when folks start making claims where the numbers really aren't mature enough to support it.

2 days ago

Submissions

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Nereus Deep Sea Vehicle Lost

Mr D from 63 Mr D from 63 writes  |  about 2 months ago

Mr D from 63 (3395377) writes "On Saturday, May 10, 2014, at 2 p.m. local time (10 p.m. Friday EDT), the hybrid remotely operated vehicle Nereus was confirmed lost at 9,990 meters (6.2 miles) depth in the Kermadec Trench northeast of New Zealand. The unmanned vehicle was working as part of a mission to explore the ocean’s hadal region from 6,000 to nearly 11,000 meters deep. Scientists say a portion of it likely imploded under pressure as great as 16,000 pounds per square inch."
Link to Original Source
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SEC Releases Long-Awaited Rules on Crowdfunding

Mr D from 63 Mr D from 63 writes  |  about 8 months ago

Mr D from 63 (3395377) writes "The Securities and Exchange Commission announced rules that will make it legal for entrepreneurs and startups to raise money by selling pieces of their company to everyday, mom-and-pop investors.

The proposed rules were released this morning and the Commission voted to adopt them. The rules will now be available for public comment for 90 days before a final set is drafted and adopted.

Proposed rules include;
1. Entrepreneurs could raise $1 million per year.
2. The amount individuals could invest would be capped depending on their net worth.
3. Equity in a company must be held for one year
4. Transactions must be supervised by an SEC-registered intermediary
5. Only U.S.-based companies would be eligible to crowdfund
6. Financial disclosure requirements. Companies that participate in online equity crowdfunding would need to disclose who are their primary officers and directors and anyone who owns more than 20 percent of the company."

Link to Original Source

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